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If you want to know the reason why the thermal shock test box does not refrigerate, we must first know its refrigeration working principle and working process, and then the sequence, first easy and then difficult, the order of refrigeration and electrical analysis and judgment one by one, the following Liuqin technology for you A specific analysis, summarizing it
.
The refrigeration working principle of the thermal shock test chamber: the high and low refrigeration cycle adopts the reverse karyo cycle, which consists of two isothermal processes and two adiabatic processes
.
The working process is as follows: the refrigerant is adiabatically compressed to a higher pressure by the compressor, which consumes work to increase the discharge temperature; the refrigerant passes through the condenser and other temperatures to exchange heat with the surrounding medium, and transfers heat to the surrounding medium; The adiabatic expansion of the valve does work, and the temperature of the refrigerant decreases; the refrigerant absorbs heat from the object with a higher temperature through the evaporator, etc.
, so that the temperature of the object to be cooled decreases
.
This cycle is repeated to achieve the purpose of cooling
.
Summary of reasons why the thermal shock test box does not cool: 1.
Problems of the thermal shock test box: ①.
Check whether the pressure of each part of the refrigeration compressor is normal.
For example, what is the normal pressure at the low-pressure end when starting and stopping? ②.
Check that the exhaust and suction pressures of the low-temperature R23 compressor stage compressors of the two sets of refrigeration units are lower than the normal values, and the suction pressure is in an evacuated state, indicating that the amount of refrigerant in the main refrigeration unit is insufficient; ③.
Touch the main unit by hand It is found that the temperature of the exhaust pipe is not high and the temperature of the suction pipe is not low (no frost) in the discharge and suction pipes of the R23 compressor, which also shows that the R23 refrigerant of the main engine group is lacking; ④.
Check the refrigeration switcher for leaks, and use a combination of leak detector and soapy water to check.
It is found that the valve stem of the hot gas bypass solenoid valve is cracked with a 1cm slit.
Because the solenoid valve is replaced in time, the switcher is refilled with fluorine.
2.
Electrical control switch problems: ①.
Check and determine whether the refrigeration compressor is running normally; ②.
The power supply voltage and current of the refrigeration compressor are in a relatively stable state, so as to avoid the partial appearance of the electrical switch.
unstable condition
.
.
The refrigeration working principle of the thermal shock test chamber: the high and low refrigeration cycle adopts the reverse karyo cycle, which consists of two isothermal processes and two adiabatic processes
.
The working process is as follows: the refrigerant is adiabatically compressed to a higher pressure by the compressor, which consumes work to increase the discharge temperature; the refrigerant passes through the condenser and other temperatures to exchange heat with the surrounding medium, and transfers heat to the surrounding medium; The adiabatic expansion of the valve does work, and the temperature of the refrigerant decreases; the refrigerant absorbs heat from the object with a higher temperature through the evaporator, etc.
, so that the temperature of the object to be cooled decreases
.
This cycle is repeated to achieve the purpose of cooling
.
Summary of reasons why the thermal shock test box does not cool: 1.
Problems of the thermal shock test box: ①.
Check whether the pressure of each part of the refrigeration compressor is normal.
For example, what is the normal pressure at the low-pressure end when starting and stopping? ②.
Check that the exhaust and suction pressures of the low-temperature R23 compressor stage compressors of the two sets of refrigeration units are lower than the normal values, and the suction pressure is in an evacuated state, indicating that the amount of refrigerant in the main refrigeration unit is insufficient; ③.
Touch the main unit by hand It is found that the temperature of the exhaust pipe is not high and the temperature of the suction pipe is not low (no frost) in the discharge and suction pipes of the R23 compressor, which also shows that the R23 refrigerant of the main engine group is lacking; ④.
Check the refrigeration switcher for leaks, and use a combination of leak detector and soapy water to check.
It is found that the valve stem of the hot gas bypass solenoid valve is cracked with a 1cm slit.
Because the solenoid valve is replaced in time, the switcher is refilled with fluorine.
2.
Electrical control switch problems: ①.
Check and determine whether the refrigeration compressor is running normally; ②.
The power supply voltage and current of the refrigeration compressor are in a relatively stable state, so as to avoid the partial appearance of the electrical switch.
unstable condition
.
