High and low temperature equipment manufacturers analyze expansion valve knowledge

The expansion valve is an important accessory in the high and low temperature integrated machine. The manufacturer tells you that there are various kinds of expansion valves, and different expansion valves have different differences.

The high and low temperature integrated machine expansion valve mainly has two kinds of thermal expansion valve and electronic expansion valve. Generally speaking, the electronic valve is used more. According to the driving method, it is divided into electromagnetic type and electric type. The electromagnetic type electronic expansion valve is attracted by electromagnetic force. The coil, the plunger (moving iron core), the valve needle, the valve seat, the reaction force spring, etc., the driving force of the electric electronic expansion valve is a motor, which is divided into a direct motion type and a speed reduction type.

Compared with the original thermal expansion valve, the advantages of the electronic expansion valve are quite numerous. The flow regulation is not affected by the change of the condensing pressure; it compensates for the change of the subcooling degree of the refrigerant before the expansion valve; because the electric signal is transmitted quickly, the execution action is rapid and accurate, so the flow can be adjusted accurately and timely, even if the change is severe, It can also avoid oscillation; it can control the evaporator outlet superheat to a small extent, thereby greatly improving the utilization of the heat transfer area of the evaporator; the same superheat setting can be set in the entire operating temperature range of the freezer. The value can be adjusted according to the actual condition of the freezer. It is not limited to the proportional adjustment. It can also use proportional integral or other adjustment rules, and can adjust the adjustment parameters.

The choice of different types of high and low temperature integrated machines in the manufacturer is somewhat different on the expansion valve. It is also very important for the cooling and heating effect. You should pay attention to its performance and quality.

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Efficient operation of high and low temperature integrated machine

To ensure more efficient operation of the high and low temperature integrated machine, you should select the appropriate type of equipment and solve the problem in time.

The selection of high and low temperature integrated machines requires some process requirements of the screw type high and low temperature integrated machine, such as cooling effect, cooling capacity, power and refrigerant type. According to the cold load and application considerations, it is easy to adjust and save energy. It is preferred to use high-low temperature integrated machine with high performance coefficient, considering the factors such as water temperature and flow, inlet water temperature, flow rate and fouling coefficient.

The high and low temperature integrated machine has a high voltage failure, and the compressor discharge pressure is too high, resulting in the action of the high voltage protection relay. If the long-term pressure is too high, it will lead to excessive operating current of the compressor, easy to burn the motor, and easily cause damage to the valve port of the compressor exhaust port. The correct way should be to control the compressor discharge pressure within the safe range!

The high and low temperature integrated machine has a low valve temperature failure, and the outlet temperature of the expansion valve reflects the evaporation temperature, which is a factor affecting the heat exchange. Generally, it has a temperature difference of 5.0 to 6.0 ° C from the outlet water of the refrigerant water. When a low valve temperature fault occurs, the compressor will stop. When the valve temperature rises, it will automatically resume operation with a protection value of -2.0 °C.

The high and low temperature integrated machine compressor overheat fault, the thermistor is embedded in the compressor motor winding, and the resistance is generally 1kΩ. When the winding is overheated, the resistance value will increase rapidly. When the winding exceeds 141kΩ, the thermal protection module SSM will operate, the unit will be shut down, and the overheat fault will be displayed. The TH fault indicator will be on.

Low and low pressure integrated compressor low pressure fault compressor suction pressure is too low, resulting in low voltage protection relay action. If the suction pressure is low, the amount of return air is small, the cooling capacity is insufficient, and the electric energy is wasted. The heat of the compressor motor for return air cooling is poor, and the motor is easily damaged! The solution is the same as the high pressure fault, try to keep the compressor within the normal pressure range.

Understand the above phenomenon in order to operate better and more efficiently. LNEYA high and low temperature integrated machine adopts a fully closed circulation pipeline system. During operation, the pressure will not rise due to high temperature, and the low temperature will automatically replenish the heat transfer medium.

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Maintenance of Glycol Cooling Heating Control System

Apart from the attention needed during the daily use, the regular check and maintenance of Glycol Cooling Heating Control System are also very important. In order to help all of you learn to use Glycol cooling heating more efficiently,   Guanya Refrigeration sort out related maintenance, so that you can use it in time.

Screw Compressor

Screw compressor is a very important part of ethylene glycol refrigerator, and the compressor is directly related to the stability of the unit. If the compressor has something wrong, In view of the high precision of the assembly precision of the screw compressor, the factory is usually required to carry out the maintenance, so it needs to be paid more attention in the ordinary use process in using.

Condensers and Evaporators

Is there is something wrong with the Glycol cooling heating control system, in view of the high precision of the assembly precision of the screw compressor, the factory is usually required to carry out the maintenance, so the compressor needs to be paid more attention in the ordinary use process.

Washing of condensers and evaporators

The cooling water of the water-cooled condenser of glycol refrigeration unit is open loop circuit. The circulating water is usually used by the cooling tower. When calcium the content of salt and magnesium salt in water is large, it is easy to decompose the fouling between the pipe and rock, and the heat transfers. Once the scale of the condenser of glycol cooling system is too thick, the cross section of the cooling water will decrease, the water volume will decrease and the condensing pressure will increase. Therefore, when the water quality of the cooling water is poor, the cooling water pipe should be washed at least once a year to remove scale and other contaminants. Of course, not only glycol cooling system but other other related cooling equipment used for a period of time, their maintenance knowledge is needed to learn in everyday use.

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Explosion-proof high and low temperature one machine evaporator use note

Each accessory in the explosion-proof high and low temperature integrated machine is more important. Among them, the evaporator has one of the four major accessories, and the refrigeration effect has a certain degree. What are the main choices of the explosion-proof high and low temperature one-piece evaporator?

Due to the influence of the height of the refrigerant liquid column, the evaporation temperature at the bottom of the flooded evaporator is higher than the evaporation temperature of the liquid surface. Different refrigerants have different effects on the evaporating temperature of different liquid levels depending on the height of the hydrostatic fluid. Regardless of the refrigerant, the lower the evaporation temperature of the liquid surface, the greater the effect of the hydrostatic height on the evaporation temperature. Therefore, the effect of the hydrostatic height on the evaporation temperature can be ignored only when the evaporation pressure is high. When the evaporation temperature is low, it cannot be ignored. That is to say, it is uneconomical to use a full liquid evaporator at this time.

If the evaporation temperature is lower than the solidification temperature of the brine, the brine may freeze. In the latter process of the brine, the temperature of the brine is lower and there is a greater likelihood of freezing. When water is used as the brine, it is theoretically possible that the inner wall temperature of the tube can be as low as 0 °C. However, for safety reasons, the inner wall temperature of the tube at the outlet end of the subsequent process is usually kept above 0.5 °C. In the case of brine as a coolant, according to the same principle, the inner wall temperature of the pipe should be higher than the solidification temperature of the brine by more than 1 °C.

The pressure loss caused by the refrigerant flowing through the evaporator inevitably causes the pressure p2 of the refrigerant at the outlet of the evaporator to be lower than the pressure p1 at the inlet, thereby lowering the suction pressure of the compressor, resulting in a decrease in the refrigeration capacity. According to different models, the choice of evaporator is also different, such as box type explosion-proof high and low temperature integrated machine, using water tank coil evaporator; open explosion-proof high and low temperature machine and screw type explosion-proof high and low temperature machine, The shell and tube evaporator is used; for the acid and alkali resistant explosion-proof high and low temperature integrated machine, a titanium tube evaporator or a stainless steel plate exchanger can be selected. An explosion-proof high and low temperature integrated machine can have a variety of options, of course, can be customized according to user needs.

The choice of explosion-proof high and low temperature one-piece evaporator must pay attention to the fact that the evaporator of Wuxi Guanya explosion-proof high and low temperature integrated machine is the evaporator of the selected brand manufacturer, so that it is more efficient in operating the explosion-proof high and low temperature integrated machine.

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Burning machine phenomenon in small high and low temperature integrated machine

The small high-low temperature integrated machine is used for the temperature control of the connected reactor in the pharmaceutical, chemical and other industries. Once the burning phenomenon occurs during operation, we need to pay special attention to analyze the occurrence and causes of such failures and solve them in time.

In the event of a small high-low temperature integrated machine burning phenomenon, first find out whether the motor burns the bearing or burns the coil. If it is a fault of the burning coil, it is mainly caused by overcurrent. Sometimes the voltage is too high or too low, which will cause the coil to be short-circuited. Therefore, check whether the voltage during operation is too much difference from the rated voltage.

The current short circuit of the small high and low temperature integrated machine may have the following reasons: the equipment is overloaded, so that the motor runs at rated current or over rated current for a long time; the mechanical failure of the pump causes the motor to be overloaded, and the current is too large to burn the coil; There is a problem with the heat dissipation of the motor. If the cooling water (air) is broken and the coil cannot be dissipated, the coil may be burned; the actual lift is too low for the lift of the pump nameplate.

The reasons for the motor burning can be divided into: load, power supply, motor insulation, and lack of equal. The lack of phase is generally caused by the lack of phase of the power supply (one phase is not supplied or the supply voltage is insufficient) or the contact point of the contactor in the line is not closed, the wire connection point is broken, loose or contact position oxidation occurs. The motor is connected in a delta connection: only one phase winding is burned, and the insulation breakdown of the one-phase winding to the ground can be measured with a megger (shake table). The motor is star-shaped (Y) connection: two-phase windings will burn out, and the two-phase windings can be measured for damage to the ground by a megger (shaker).

Overloading is generally caused by long-time overcurrent operation of the motor, overheating, frequent starting or braking, and wiring errors (triangulation is connected to the star). The cause of overheating is: Exceeding the load operation, causing the motor to heat up. Or the motor starts frequently, causing the motor to overheat. The reason for this is that the enameled wire caused by the motor manufacturing process is broken. The reason for this is that the phase paper is not in place, or the phase paper (casing) is broken. The reason for the ground strike is that the distance between the coil and the end cap base is not enough.

The motor failure above the small high and low temperature integrated machine hopes that everyone can find the fault in time and solve it in time to better help the equipment to run efficiently.

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Instructions for use of various components of high and low temperature cycle machine

In the high and low temperature cycle machine, each accessory has its own performance advantages. When running, we need to have a clear understanding of each accessory in order to run the device better.

The compressor functions to compress and drive the refrigerant in the refrigerant circuit. The condenser is one of the main heat exchange equipments in the cold storage refrigeration system. It mainly cools and condenses the high temperature refrigerant superheated steam discharged from the assembled cold storage compressor into a high pressure liquid. Dry filter filters impurities and moisture in the system. The oil pressure protector is used to ensure that the compressor has sufficient oil. The expansion valve is also called a throttle valve, which can make the system high and low pressure to form a huge pressure difference, so that the high-pressure refrigerant liquid at the outlet of the expansion valve rapidly expands and evaporates. It absorbs the heat in the air through the pipe wall and exchanges heat and cold.

The oil separator separates the lubricating oil in the high pressure steam discharged from the refrigeration compressor to ensure safe and efficient operation of the device. According to the principle of reducing the gas flow rate and changing the direction of the gas flow, the oil particles in the high pressure steam are separated by gravity. Generally, when the gas flow rate is less than 1 m/s, oil particles having a diameter of 0.2 mm or more in the steam can be separated. The evaporator pressure regulator prevents the evaporator pressure (and evaporation temperature) from falling below a specified value. It is also sometimes used to adjust the evaporator to force to accommodate changes in load. The evaporator sucks away the heat in the cold storage, so that the liquid refrigerant evaporates under low pressure and low temperature, absorbs the heat from the freezer and evaporates, turns into a gaseous refrigerant, and the gaseous refrigerant is sucked into the compressor for compression, and then discharged. Heat into the condenser. Basically, the principle of the evaporator and the condenser are the same, except that the former absorbs heat into the reservoir and the latter exhausts heat to the outside.

Store the refrigerant storage tank to ensure that the refrigerant is always saturated. The solenoid valve prevents the high-pressure part of the refrigerant liquid from entering the evaporator when the compressor is stopped, avoiding the low pressure of the compressor at the next startup, and preventing the compressor from slamming. In addition, when the temperature of the cold storage reaches the set value, the thermostat operates, the solenoid valve loses power, and the compressor stops when the low pressure reaches the set value of shutdown. When the temperature in the cold storage rises to the set value, the thermostat operates and the solenoid valve is energized. When the low pressure rises to the compressor start setting, the compressor starts. The high and low voltage protectors prevent high pressure from being too high and low pressure to protect the compressor. The thermostat is equivalent to the high and low temperature cycle machine. The brain controls the opening and closing of the cooling and the defrosting and fan opening and closing.

The accessories of the high and low temperature cycle machine are more from large to small, and we need to spend some time to study carefully to avoid damage caused by improper use of the accessories.

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Hot and cold dynamic constant temperature control equipment cryopump installation points

The performance of each component in the cold and heat source dynamic constant temperature control equipment is different. We must make full use of each accessory to make the equipment run better. The cryopump is one of the main accessories, and it is also installed. Need to install as required.

In the cold and heat source dynamic constant temperature control equipment, the cryogenic pump needs to pay attention to the installation facilities and requirements during installation. The foreline pump-cryogenic pump requires a pre-stage pump pre-vacuum chamber to pump the starting pressure of the cryopump. Adsorption well—Install the water-cooled baffle. If the oil vapor returns to the cryopump, the adsorption array can be contaminated, and the adsorption array must be replaced.

The high vacuum valve is installed between the cryopump and the vacuum chamber, which can shorten the starting time, and can also detect the leak in the vacuum chamber without deflation in the vacuum chamber. Pre-pumping valve At the pre-pumping port of the cryopump, a valve must be installed. The valve is open during pre-draining and is closed during operation of the cryop pump. Another one is used to vacuum the same mechanical pump. The room is pre-extracted.

Then install the cryopump, high vacuum flange connection, the cryopump can be fixed in any place required by the vacuum chamber by means of its high vacuum flange. Please check whether the “O” ring is intact before installation, so that there is no indentation and miscellaneous on the surface. Things are guidelines. The connection between the suction port and the safety valve, the cryopump can not be exhausted during the operation, so before starting, it is necessary to use a pump such as a mechanical pump to pre-pump the cryopump through the suction interface. Be sure to connect the pumping port of the cryopump to the pre-stage pump of the corresponding size.

Connect the cold and heat source dynamic constant temperature control equipment to the cryopump and compressor, and remove the cryopump and compressor, as well as the protective cap on all self-sealing joints on the metal hose. Note: Never use a cleaner to wipe the self-sealing joint in the following steps. Before connecting, you must ensure that there are no dust, oil, particles, etc. on the joint. If necessary, use a brush to clean the thread. Use a soft cloth without cotton to wipe any dirt on the sealing surface. Connect the metal hose, connect the hose according to the direction of the airflow, start from the compressor to the cryopump, then from the cryopump to the compressor, use two wrenches to tighten each self-sealing joint to protect the hose from twisting and leaking. Tighten each joint moderately and check the pressure gauge of the compressor after connecting.

The cryopump of the cold and heat source dynamic constant temperature control device is recommended to be installed according to the above instructions during installation. Do not install it by yourself, avoiding improper installation and causing malfunction.

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Maintenance knowledge of high and low temperature constant temperature circulation device

The high and low temperature constant temperature circulation device is one of the more common equipments in the temperature control system. A good equipment is inseparable from daily maintenance. So how much do you know about maintenance?

High and low temperature constant temperature circulation device The entire liquid circulation is closed, with an expansion vessel, the expansion vessel and the liquid circulation are adiabatic, do not participate in the liquid circulation, but are mechanically connected, regardless of whether the temperature of the liquid circulation is high temperature or low temperature expansion in the container The medium is below 60 degrees.

High and low temperature constant temperature circulation device, no water vapor absorption at low temperature, no oil mist at high temperature, heat transfer oil can have a wide working temperature; mechanical and electronic valves are not used in the whole circulation system. When opening or closing the test object from the box, the article shall not be in contact with the door sealing strip. If the compressor is cooled by air cooling, the condenser fan shall be regularly inspected and the condenser shall be decontaminated and dedusted.

Due to the different cleanliness levels of the high and low temperature constant temperature circulation device, many small particles such as dust will be condensed on the evaporator under the forced air circulation, so we must clean the evaporator regularly. The humidifier fouling easily causes the humidifier to dry and may burn the humidifier, so the water circuit and the humidifier must be cleaned regularly. At the end of each experiment, it is recommended to clean the test chamber with clean water to keep the equipment clean. After the cabinet is cleaned, the cabinet should be dried to keep the cabinet dry. After the completion of each test, the temperature is set near the ambient temperature, and the power is turned off after about 30 minutes of work, and the wall of the working chamber is wiped clean.

LNEYA high and low temperature constant temperature circulation equipment professional manufacturer, producing various types of high and low temperature one machine, can also design and manufacture various non-standard products according to customer needs.

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Several Big Considerations for Enterprises When Using Heating Coolers

In addition to the above-mentioned enterprises, which should arrange for someone to be responsible for the start and stop of refrigerators, switches, and repairs and maintenance. The precautions for the use of refrigerators in enterprises are as follows:

First, the refrigerant leaked
Leakage of refrigerant not only affects the cooling efficiency of the heating and cooling machine, but also affects the health of the personnel involved in the engine room due to leakage of the refrigerant. Therefore, the problem of leakage of the refrigerant must be noticed.

Under normal circumstances, the refrigerant is not a consumable product, so it will not be constantly missing. If it is often or abruptly missing, it is recommended to check whether the refrigerant in the refrigerator is leaking. If there is a leakage problem, the leak should be found in time and make up for leaks, or replace the relevant refrigerant piping and connections. And if necessary, it should perform forced ventilation.

Second, pay attention to the load of the refrigerator
The load on the refrigerator is larger, or it exceeds the rated load, resulting in overload, which will affect more serious problems, including reduction of cooling efficiency, increase of noise, increase of vibration amplitude, excessive consumption of electrical resources, reduced life expectancy and so on. It needs to pay attention!

Third, temperature and pressure
It can be said that the parameters related to temperature and pressure are the most important parameters of the refrigerator. Enterprises should pay attention to the parameters related to the temperature and pressure of the refrigerator. Solve problems in time, and avoid affecting the normal operation of the refrigerator.

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Refrigeration heating cycle device compressor precautions

The performance of the compressor in the refrigeration heating cycle device is very important. When choosing the compressor brand of LNEYA refrigeration and heating cycle device, the compressors of domestic and foreign brand manufacturers are specially selected, the performance is more reliable, but it is necessary to pay attention to the use of the compressor. There are a few things to keep in mind.

The compressor in the refrigeration heating cycle has only one correct connection, and the others are wrong. Due to miswired, the thermal protector may lose the protection function, which may cause the compressor to burn out, which generally causes the secondary coil to burn out. For the three-phase compressor, there must be a phase sequence protection device.

For a refrigeration heating system that is not fully enclosed, the refrigerant may enter the system, and the source of the system may be there. When the copper tube is cut, fine copper chips are generated, and the processing oil, impurities and other foreign materials in the system manufacturing process, and the compressor are long-term. When exposed to air, dust, water vapor enters, and welds, an oxide film is formed on the inner surface of the pipe, so it should be filled with nitrogen gas during welding.

The influence of the residue on the system in the refrigeration heating cycle system will aggravate the wear of the friction surface of the moving parts and block the oil passage of the pump. When the compressor contains tiny inclusions such as moisture, fiber, dust, etc., it may be adsorbed on the motor windings and wiring. On the column, reduce the insulation performance of the whole machine. The processing oil and the like also react with the refrigerant or the refrigerating machine oil to generate sludge and coke, and adhere to the exhaust valve piece, the suction filter, and the capillary to cause clogging.

The refrigeration heating cycle device is recommended to use a closed circulating piping system. There is no water vapor absorption at low temperature, no oil mist at high temperature, and the heat transfer oil can have a wide operating temperature. No mechanical and electronic valves are used in the entire circulation system. 

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High and low temperature cycle machine compressor performance description

The importance of the performance of high and low temperature cycle machine compressors must be known to everyone, then LNEYA reminds users that it is necessary to understand the common sense of the performance of the compressor.

The high-low temperature cycle integrated machine compressor thermal switch and the thermistor are independent of the compressor wiring, and are not directly connected in the compressor circuit. The thermal switch controls the compressor control circuit through the feel of the compressor cover temperature. . The thermistor is a negative temperature characteristic component that has a feedback signal output to the microprocessor. A set of temperature and resistance tables are pre-entered in the microprocessor. Each time a resistance is measured, the corresponding temperature can be reflected in the microcomputer, and then the temperature control is achieved.

After the high-low temperature cycle integrated machine is charged with refrigerant, the electric performance is checked first. After the liquid refrigerant is sealed, the liquid refrigerant charged may condense on the terminal block, and the insulation resistance of the liquid refrigerant is much smaller than that of the gaseous refrigerant. Instantly reduce the insulation level of the whole machine. After operation, the liquid refrigerant evaporates and the insulation returns to normal.

Why does the system have to specify the degree of vacuum? The vacuum degree of the refrigeration heating temperature control system of the high and low temperature cycle integrated machine directly affects the water content in the system. The lower the vacuum degree, the less water vapor remains in the system. If it is not vacuum, it may cause ice blockage of the capillary tube and expansion valve during heating; the acidic environment caused by moisture will aggravate the deterioration of the oil and the burning of the motor; it will erode the parts and have a fatal effect on the compressor. There will be a phenomenon of “copper plating”, which will affect the matching clearance and sealing effect of the parts; severe copper plating will directly lead to the blocking of the parts; the refrigerant will decompose. In the vacuum state, the compressor is strictly prohibited from operating or applying an electric pulse, because in the vacuum state, electrons are easily released, thus generating a discharge. When there is a medium (such as refrigerant or air) between the charged bodies, the electrons are not easily released.

Compressor performance is more critical. LNEYA high and low temperature cycle machine compressors are all branded compressors, both domestic and foreign brands, and can be selected according to specific models.

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Noise description of common faults in high and low temperature integrated equipment

High-low temperature integrated machine equipment may cause malfunction due to improper operation, then how to deal with noise failure of the equipment, and then analyze the noise too high.

The suction of high and low temperature integrated equipment is one of the main reasons for the excessive noise of the hydraulic pump. When air is mixed into the oil, it is easy to form cavitation in its high pressure zone and propagate in the form of pressure waves, causing oil to oscillate, causing cavitation noise. The main reasons are: the oil filter of the hydraulic pump, the blockage of the oil inlet pipe or the high viscosity of the oil can cause the vacuum at the pump inlet to be too high, so that the air penetrates. The oil seal of the hydraulic pump and the pilot pump shaft is damaged, or the inlet pipe is poorly sealed, causing air to enter. The oil level of the fuel tank is too low, so that the hydraulic pump inlet pipe is directly sucked.

When there is high noise in the operation of the hydraulic pump, the above parts should be inspected and the problems should be dealt with in a timely manner. The internal components of the high and low temperature integrated machine are excessively worn, such as the wear and strain of the piston pump cylinder and the distribution plate, the plunger and the plunger hole, etc., causing serious leakage in the hydraulic pump. When the hydraulic pump outputs high pressure and small Flow pulsation occurs when the fluid is flowing, causing higher noise. At this time, the deflection angle of the pilot system variable mechanism can be appropriately increased to improve the influence of internal leakage on the pump output flow. The servo valve spool of the hydraulic pump and the piston that controls the flow will also cause the piston to pulsate during the movement due to local wear and strain, causing fluctuations in the output flow and pressure of the hydraulic pump, resulting in large vibration and noise at the pump outlet. . At this point, the components that are severely worn or strained can be brushed and replaced or replaced.

The hydraulic pump distribution plate is also one of the important components that cause noise. In the use of high and low temperature integrated machine equipment, due to surface wear or sludge deposition on the opening of the unloading tank, the unloading tank will be shortened and the unloading position will be changed, which will cause oil trapping, which will lead to higher noise. In the normal repair process, the flat-repaired distribution plate will also have the effect of shortening the unloading groove. If it is not properly lengthened at this time, it will generate more noise. During the assembly process, the large unloading groove of the distribution plate must be installed in the high pressure chamber of the pump, and its sharp angle direction must be opposite to the direction of rotation of the cylinder block, otherwise it will bring greater noise to the system.

If the equipment has a noise failure, it needs to be solved in time. Once there is noise, it is definitely a malfunction.

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Operation LNEYA high and low temperature cycle machine note

LNEYA high and low temperature cycle machine uses mechanical refrigeration to obtain low temperature heating tube heating to obtain high temperature. It is used with various glass reactors and reactors. What should be paid attention to when using it?

High and low temperature cycle machine is suitable for dynamic constant temperature control of high pressure reactor cold and heat source, dynamic constant temperature control of double-layer glass reactor cold and heat source, dynamic constant temperature control of double-layer reactor cold and heat source, thermostat control of microchannel reactor cold and heat source, small Constant temperature control system, steaming system temperature control, material low temperature high temperature aging test, combined chemical cold source heat source constant temperature control, semiconductor equipment cooling and heating, vacuum chamber refrigeration heating constant temperature control and other industries.

When in use, the wooden box needs to be opened first to install the inlet and outlet valve on the inlet port. The upper and lower sides of the machine are marked with inlet and outlet ports, the valve is a shut-off valve, the valve medium flows in a direction, the valve is marked with a flow direction, and the valve and the reaction kettle are used. The hoses are butted, and the inlet and outlet of the reactor should be kept in and out to ensure that the reactor is kept full of liquid. The high and low temperature cycle machine opens the high and low temperature tank to add liquid holes, and the medium is added into the machine to open the machine's circulation switch, so that the liquid circulates throughout the system. Note that the air in the system is to be evacuated.

When using, turn on the power and press the key to enter the working state. The upper window of the display window displays the measured temperature, the lower window displays the current set temperature, press the set button, the upper window displays 5P, with the △▽ addition and subtraction setting The temperature lower window displays the set temperature. Press the heating button, the indicator light next to the heating button lights up, and the heating starts working. Press the cooling button, the indicator next to the cooling button is on, and the refrigeration compressor starts to work. Note: * When the time is *, the compressor is delayed by about 3 minutes.

The performance of the high and low temperature cycle machine is related to the operation of the entire high and low temperature cycle machine. LNEYA high and low temperature cycle machine has spent more effort in design and configuration to help users to run better.

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High and low temperature circulation tank daily use instructions

During the operation of the high and low temperature circulation tank, some phenomena generated by the LNEYA protection device need to be observed. If some improper sounds and unexpected situations occur, we need to solve it in time.

The high and low temperature circulation tank is not connected to the power switch, forget to turn on the leakage circuit breaker, and turn the leakage circuit breaker to ON. There is no input from the power supply: the fuse is burnt. In order to ensure the safe and reliable operation of the refrigeration system and prolong the service life of the compressor, please pay attention to daily maintenance. Before starting the compressor, pay attention to whether the valve to be opened in the exhaust cut-off valve and its system is in the correct position, and check whether the power supply voltage and ambient temperature are within the specified range. During the operation of the compressor, the suction and exhaust pressure of the compressor should not exceed the range of use, and the operation sound of the compressor should be heard. Except that the intake valve and exhaust valve have clear pouring sound, other parts should not be knocked. When the sound is heard, it is found that the leak should be repaired in time. When the compressor is stopped for a long time, the refrigerant should be recycled to the reservoir and the exhaust shutoff valve should be closed.

The high and low temperature circulation tank adopts a fully closed pipeline design and adopts a high efficiency plate heat exchanger. It is applied to the temperature rise and temperature control of the glass reactor, metal reaction kettle and bioreactor, especially suitable for heat and release during the reaction process. Thermal process control. The high and low temperature circulation tank is applied to the temperature rise and temperature control of the glass reactor, the metal reaction kettle and the bioreactor, and is particularly suitable for controlling the heat demand and the heat release process during the reaction process.

Every accessory in the high and low temperature circulation tank is very important. Once the fault occurs, it needs to be solved in time. In the process of running, pay more attention to the maintenance in time to ensure the efficient operation of the accessories.

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Discussion on maintenance of high and low temperature integrated cycle machine

LNEYA high and low temperature integrated cycle machine is a refrigeration heating equipment produced by the use of refrigeration heating dynamic temperature control technology. The temperature range is from -120 °C to 350 °C. It has superior performance, high precision and intelligent temperature control. It needs regular time when used. Do a good job of maintenance.

The high and low temperature integrated cycle machine exchanges heat or direct contact heat exchange mode to exchange heat of the medium and cool it through the cooling tower to recycle water to save water resources. In general, the circulating water is neutral and weakly alkaline, and the pH is controlled between 7 and 9.5; in the case of circulating cooling water in direct contact with the medium, it is acidic or alkaline (pH greater than 10.0), generally less.

Always check whether the cooling water pipe is connected safely and securely. Is the flow, temperature and pressure of the cooling water suitable? It is recommended to check the water level of the water tank every month. Once the water level drops, it should be replenished in time and only distilled water can be added. In order to prevent the growth of microorganisms or free organic impurities in the water, so as not to impede the flow of water and affect the cooling effect, it is recommended to add a bactericide in the water, and the distilled water in the water tank is replaced at least once a year. The blades of the air-cooled filter and the cooling fan of the compressor should be cleaned every 6 months. After the cleaning is completed, 12 drops of oil should be added to the fan bearing. In order to reduce the impact of scale on flow and cooling capacity, it is recommended to clean the pipeline every 5 years (if it is cooled with tap water every 2 years).

The high and low temperature integrated cycle machine is very convenient to install and move, but it requires a higher working environment because it is cooled by hot air circulation. Therefore, if the ventilation effect of the installation workshop is not good, it will directly affect the cooling effect. In addition, if you want to put the equipment in a dust-free workshop with humidity requirements, then I advise you to modify the water-cooled.

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