System and method for measuring humid air permeation of refrigeration device box body

Abstract

The invention discloses a refrigeration device box moist air permeation measurement system, which comprises a cold and heat generation system used for simulating the working environment of a refrigeration device and triggering the permeation process of moist air by adjusting the temperature change; the data acquisition and control system is used for collecting and monitoring temperature, humidity and seepage parameters of the cold and heat generation system in the simulation process; and the permeation tracing system is used for tracking and quantifying the permeation path and the permeation rate of the wet air. According to the invention, the wet air can be subjected to forward and reverse switching measurement, so that the permeation amount is independently measured, a real wet air transmission path is restored, more direct and accurate data are provided, the influence of a mixing effect is avoided, and the measurement result is more representative; and the influence of wet air on the performance and long-term stability of the refrigeration device can be conveniently evaluated and controlled.

Description

Technical Field

[0001] The present invention relates to the technical field of wet air penetration detection of refrigeration devices, and in particular to a system and method for measuring wet air penetration of a refrigeration device cabinet. Background Art

[0002] During the operation of refrigeration equipment (such as refrigerators and freezers), the periodic start and stop of the compressor causes periodic changes in the temperature and pressure difference inside the box, which causes the transfer of humid air inside and outside the box, and the transfer path usually includes the door seal and the defrost drain hole. During the cooling stage of the compressor operation, the box is generally under negative pressure, and the outside humid air enters the box through the door seal and the defrost drain pipe. During the warming stage when the compressor is stopped, the box is generally under positive pressure, and the humid air in the box is discharged to the outside environment through the door seal and the defrost drain pipe. Under such reciprocating action, the humid air will frost on the inner tank, drawer, and evaporator, which will not only affect the operating energy consumption, but also cause reliability problems such as condensation and ice.

[0003] Therefore, it is necessary to measure the penetration of humid air in the refrigeration cabinet to evaluate and control the impact of humid air on equipment performance and long-term stability. Summary of the invention

[0004] The purpose of the present invention is to solve the above-mentioned background technical problems and to provide a refrigeration device cabinet wet air permeation measurement system and method.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] A refrigeration device cabinet wet air permeation measurement system, comprising:

[0007] A heat and cold generating system, which is used to simulate the working environment of a refrigeration device and to induce the penetration process of moist air by adjusting the temperature change; a data acquisition and control system, which is used to collect and monitor the temperature, humidity and penetration parameters of the heat and cold generating system during the simulation process; a penetration tracing system, which is used to track and quantify the penetration path and rate of moist air; the heat and cold generating system comprises: a refrigeration box, an evaporator is arranged in the refrigeration box, an evaporating fan is arranged on the top of the evaporator, three branches are arranged at the outlet of the evaporator, and the three branches are arranged at the outlet of the evaporator. The branches are respectively the first branch, the second branch and the third branch; the first branch is provided with a transport pump, a first stop valve, a heating box, a heater and a second stop valve, and the brine flows back to the inlet of the evaporator through the above structures in the first branch in sequence; the second branch is provided with the transport pump, the third stop valve, the heat exchanger and the fourth stop valve, and the brine flows back to the inlet of the evaporator through the above structures in the second branch in sequence, and the heat exchanger is connected to a refrigerant circulation pipeline; the third branch is provided with a fifth stop valve, a regenerator, a compressor, a condenser, a capillary tube and The seventh stop valve, the refrigerant in the third branch flows back to the inlet of the evaporator through the above structure in sequence; the data acquisition and control system includes: a controller, a collector, a workstation and a gas composition analyzer arranged outside the refrigeration box, the controller, the collector, and the gas composition analyzer are all connected to the workstation through a signal line, and the gas composition analyzer is connected to the refrigeration box through an exhaust pipe and a return air pipe; the collector is connected to a pressure difference sensor, an ambient temperature and humidity probe, a temperature control sensor in the box and multiple temperature and humidity probes through a signal line; the permeation The tracing system includes: a gas storage tank, the outlet of the gas storage tank is connected to a gas pipeline, a gas pressure regulating valve is arranged on the main pipe of the gas pipeline for adjusting the outlet pressure, the gas pipeline is provided with two branches, one branch is placed outside the refrigeration box and is provided with a first gas shut-off valve, and the other branch extends into the refrigeration box and is provided with a second gas shut-off valve, an air suction pump and a flow meter are arranged on the gas composition analyzer, and under the suction action of the air suction pump, the gas in the refrigeration box enters the gas composition analyzer for detection and then flows back into the refrigeration box.

[0008] As a further solution of the present invention: the temperature T detected by the temperature control sensor in the box c As the temperature control point inside the refrigeration box, the coordinates are The temperature and humidity probes are five, namely, the first temperature and humidity probe, the second temperature and humidity probe, the third temperature and humidity probe, the fourth temperature and humidity probe and the fifth temperature and humidity probe, wherein the first temperature and humidity probe, the second temperature and humidity probe and the third temperature and humidity probe are arranged diagonally along the refrigeration box, and the coordinates are respectively The average temperature of the three points and humidity average are the characteristic temperature and humidity of the air area in the box, respectively; x0, y0, z0 are the length, width and height of the cavity inside the refrigeration box, respectively.

[0009] As a further solution of the present invention: the fourth temperature and humidity probe is arranged at the air outlet of the evaporator, and the fifth temperature and humidity probe is arranged at the return air outlet of the evaporator.

[0010] As a further solution of the present invention: the branch interface of the gas pipeline located inside the refrigeration box is close to the evaporating fan, and the coordinates of this branch interface are The coordinates of the three branch interfaces of the exhaust pipe located inside the refrigeration box are respectively The branch interface coordinates of the return air duct located inside the refrigeration box are

[0011] A method for using a refrigeration device cabinet wet air permeation measurement system, comprising:

[0012] S1. Test the permeation volume caused by the positive pressure difference during the temperature rise in the refrigeration box, connect it to the ambient air, and test the tracer gas background concentration c in the environment through the component analyzer. atm Change curve, adjust the valve on the gas pipeline, observe the change curve of the real-time concentration c of the tracer gas, until the concentration value reaches the target value c0, stop supplying the tracer gas to the refrigeration box, drive the refrigeration box to enter the gradual heating mode, fit the wet air exchange rate of the heating process and the temperature maintenance process by the linear method, adjust the heating rate and heating temperature of the refrigeration box, and test the wet air exchange rate generated by the positive pressure difference under different temperature and humidity difference conditions;

[0013] S2. Test the permeation volume caused by the negative pressure difference during the cooling process in the refrigeration box. It is not connected to the ambient air and records the tracer gas background concentration c in the refrigeration box. atm , the change curves of the ambient temperature and humidity probe, the first temperature and humidity probe, the second temperature and humidity probe, and the third temperature and humidity probe, adjust the valve on the gas pipeline, observe the change curve of the real-time concentration c of the tracer gas, drive the refrigeration box to enter the gradual cooling mode, fit the wet air exchange rate of the cooling process and the temperature maintenance process through the linear method, adjust the cooling rate and cooling temperature of the refrigeration box, and test the wet air exchange rate caused by the negative pressure difference under different temperature and humidity difference conditions;

[0014] S3, test the permeation volume generated by the periodic positive and negative pressure difference during the intermittent refrigeration process in the refrigeration box, drive the refrigeration box to cool down and enter the intermittent refrigeration mode, connect with the ambient air, and test the tracer gas background concentration c in the environment through the gas composition analyzer atmChange curve, adjust the valve on the gas pipeline, observe the real-time concentration c change curve of the tracer gas, until the concentration value reaches the target value c0, stop supplying tracer gas to the refrigeration box, fit the two-way average exchange rate of wet air in the intermittent refrigeration process by the straight line method, calculate the dehumidification capacity of the evaporator, adjust the temperature fluctuation amplitude and frequency of the refrigeration box, and test the wet air exchange rate caused by positive and negative pressure differences under different temperature and humidity difference conditions.

[0015] As a further solution of the present invention: in the step S1, it includes:

[0016] S11, open the first stop valve and the second stop valve, and close the remaining stop valves;

[0017] S12. Open the door of the shielding box to connect to the ambient air, and turn on the gas composition analyzer to test the tracer gas background concentration c in the environment. atm Change curve;

[0018] S13, close the first gas stop valve on the gas pipeline, open the second gas stop valve, open the gas pressure regulating valve, turn on the evaporation fan, the gas composition analyzer and the suction pump, observe the tracer gas real-time concentration c change curve of the gas composition analyzer, and close the second gas stop valve when the concentration value reaches the target value c0;

[0019] S14, start the transport pump and the heater, the refrigeration box enters the gradual heating mode, the system pipeline working medium is the refrigerant, turn on the power to the heater, adjust the power of the heater, so that the temperature detected by the temperature control sensor in the box is T c Gradually from the initial ambient temperature T e Gradually heat to the preset heating temperature T h , and maintain for a period of time Δt r ;

[0020] S15, record the temperature inside the refrigeration box from T e To T s And maintain for a period of time Δt r The tracer gas concentration c change curve, the pressure difference sensor, the ambient temperature and humidity probe, the first temperature and humidity probe, the second temperature and humidity probe, and the third temperature and humidity probe are calculated using the formula ln(cc atm )=-I×t+ln(c0-c atm ) Linear method to fit the wet air exchange rate I during the heating process and the temperature maintenance process;

[0021] S16. Repeat steps S11 to S15 to adjust the heating rate and heating temperature of the refrigeration box by adjusting the power of the heater, and test the wet air exchange rate I generated by the positive pressure difference under different temperature and humidity difference conditions.

[0022] As a further solution of the present invention: in the step S2, it includes:

[0023] S21, open the third stop valve, the fourth stop valve, the sixth stop valve, and the eighth stop valve, and close the remaining stop valves;

[0024] S22. Close the door of the shielding box to prevent it from being connected to the ambient air. Turn on the gas composition analyzer to record the background concentration of the tracer gas in the refrigeration box. atm , the change curves of the ambient temperature and humidity probe, the first temperature and humidity probe, the second temperature and humidity probe, and the third temperature and humidity probe;

[0025] S23, close the second gas stop valve on the gas pipeline, open the first gas stop valve, open the gas pressure regulating valve for a period of time, close the gas pressure regulating valve and the first gas stop valve, turn on the gas composition analyzer and the suction pump, and observe the tracer gas real-time concentration c change curve of the gas composition analyzer;

[0026] S24, turn on the compressor and condensing fan, the temperature of the heat exchanger drops, turn on the transport pump and evaporating fan, the evaporator temperature drops, the refrigeration box enters the gradual cooling mode, the system pipeline working medium is the refrigerant, adjust the compressor speed so that the temperature T detected by the temperature control sensor in the box c Gradually from the initial ambient temperature T e Gradually cool down to the preset cooling temperature T c , and maintain for a period of time Δt d ;

[0027] S25, record the temperature inside the refrigeration box from T e To T c And maintain for a period of time Δt d The tracer gas concentration c change curve and the pressure difference sensor change curve are calculated by using the formula ln(cc atm )=-I×t+ln(c0-c atm ) Linear method to fit the wet air exchange rate I during the cooling process and the temperature maintenance process;

[0028] S26. Repeat steps S21 to S25 to adjust the cooling rate and cooling temperature of the refrigeration box by adjusting the speed of the compressor, and test the wet air exchange rate I generated by the negative pressure difference under different temperature and humidity difference conditions.

[0029] As a further solution of the present invention: in the step S3, it includes:

[0030] S31, open the fifth stop valve and the seventh stop valve, and close the remaining stop valves;

[0031] S32, turn on the evaporator fan, compressor and condensing fan, the evaporator temperature drops, the refrigeration box cools down and enters the intermittent refrigeration mode, the system pipeline working medium is the refrigerant, the evaporator fan, compressor and condensing fan are controlled, and the temperature range is preset in the controller so that the temperature T detected by the temperature control sensor in the box is c In [T low ,T up ] changes;

[0032] S33, open the door of the shielding box to connect to the ambient air, and turn on the gas composition analyzer to test the tracer gas background concentration c in the environment atm Change curve;

[0033] S34, close the first gas stop valve on the gas pipeline, open the second gas stop valve, open the gas pressure regulating valve, turn on the evaporation fan, turn on the gas composition analyzer and the micro suction pump, observe the tracer gas real-time concentration c change curve of the gas composition analyzer, and close the second gas stop valve when the concentration value reaches the target value c0;

[0034] S35, record the change curve of the tracer gas concentration c in the refrigeration box during intermittent refrigeration, the change curve of the pressure difference sensor, the ambient temperature and humidity probe, the first temperature and humidity probe, the second temperature and humidity probe, the third temperature and humidity probe, the fourth temperature and humidity probe, and the fifth temperature and humidity probe, using the formula ln(cc atm )=-I×t+ln(c0-c atm ) The linear method is used to fit the average two-way exchange rate I of the wet air in the intermittent refrigeration process, and the dehumidification capacity of the evaporator is calculated according to the fourth temperature and humidity probe and the fifth temperature and humidity probe;

[0035] S36, repeating steps S31 to S35, adjusting the temperature fluctuation amplitude and frequency of the refrigeration box by adjusting the preset temperature of the controller, and testing the wet air exchange rate I generated by the positive and negative pressure differences under different temperature and humidity difference conditions.

[0036] Beneficial effects of the present invention:

[0037] (1) In the present invention, the humid air can be measured in a forward and reverse switching manner, so as to measure the permeability separately, restore the real humid air transmission path, provide more direct and accurate data, avoid the influence of mixing effect, make the measurement result more representative, and facilitate the evaluation and control of the influence of humid air on the performance and long-term stability of the refrigeration device.

[0038] (2) In the present invention, the wet air permeability is switched between steady state and dynamic state, and the steady state permeability and the average permeability in the dynamic state are measured according to demand. By switching the measurement between the steady state and dynamic modes, the wet air permeability under different working conditions can be accurately grasped, which helps to evaluate the long-term stability and efficiency of the refrigeration device.

[0039] (3) In the present invention, the refrigeration temperature can be adjusted during the permeation measurement to facilitate the measurement of steady-state and dynamic permeation amounts at different refrigeration temperatures. By adjusting the refrigeration temperature during the measurement, the performance of the system under different working conditions can be simulated, helping engineers understand the permeation characteristics of the system under different temperature and load conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The present invention will be further described below in conjunction with the accompanying drawings.

[0041] Figure 1 It is a structural schematic diagram of a refrigeration device cabinet wet air permeation measurement system of the present invention;

[0042] Figure 2 is a flow chart of a method for measuring wet air permeability of a refrigeration device cabinet using the present invention;

[0043] Figure 3 It is a schematic diagram of the experimental door seal structure of the present invention with a magnetic strip thickness of 1.5 mm;

[0044] Figure 4 It is a schematic diagram of the experimental door seal structure of the present invention with a magnetic strip thickness of 2.0 mm;

[0045] Figure 5 It is a schematic diagram of the experimental door seal structure of the present invention with a magnetic strip thickness of 2.4 mm;

[0046] Figure 6 It is a schematic diagram of the experimental door seal structure of the present invention with a magnetic strip thickness of 2.6 mm;

[0047] Figure 7 It is a schematic diagram of the experimental door seal structure of the present invention with a magnetic strip thickness of 3.0 mm;

[0048] Figure 8 It is a schematic diagram of the CO2 concentration change and fitting curve during the measurement process of the intermittent refrigeration positive and negative pressure difference working conditions of the present invention;

[0049] Fig. 9 It is a schematic diagram of refrigerator parameter changes during the intermittent refrigeration positive and negative pressure difference working process of the present invention.

[0050] In the figure:

[0051] 1. Refrigeration box; 2. Evaporator; 3. Evaporation fan; 4. Transport pump; 5. First stop valve; 6. Heating box; 7. Heater; 8. Second stop valve; 9. Third stop valve 3; 10. Heat exchanger; 11. Fourth stop valve; 12. Fifth stop valve; 13. Sixth stop valve; 14. Compressor; 15. Condenser; 16. Condensing fan; 17. Capillary tube; 18. Regenerator; 19. Seventh stop valve; 20. Eighth stop valve; 21. Power supply; 22. Controller; 23. Collector; 24. Workstation; 25. Gas composition analyzer; 26. Gas storage tank; 27. Gas pressure regulating valve; 28. First gas shut-off valve; 29. ​​Second gas shut-off valve; 30. Gas transmission pipeline; 31. Exhaust pipeline; 32. Return air pipeline; 33. Pressure difference sensor; 34. Ambient temperature and humidity probe; 35. Temperature control sensor in the box; 36. First temperature and humidity probe; 37. Second temperature and humidity probe; 38. Third temperature and humidity probe; 39. Fourth temperature and humidity probe; 40. Fifth temperature and humidity probe; 41. Suction pump; 42. Flow meter; 43. Shielding box. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] See also Figure 1 As shown, the present invention is a refrigeration device cabinet wet air penetration measurement system, including: a shielding cabinet 43, the shielding cabinet 43 is provided with a cold and heat generating system, a data acquisition and control system and a penetration tracing system.

[0054] The heat and cold generation system is used to simulate the working environment of the refrigeration device and to induce the penetration process of moist air by adjusting the temperature change. The data acquisition and control system is used to collect and monitor the temperature, humidity and penetration parameters of the heat and cold generation system during the simulation process. The penetration tracer system is used to track and quantify the penetration path and rate of moist air.

[0055] Specifically, the cold and heat generating system includes: a refrigeration box 1, an evaporator 2, an evaporating fan 3, a transport pump 4, a first stop valve 5, a heating box 6, a heater 7, a second stop valve 8, a third stop valve 9, a heat exchanger 10, a fourth stop valve 11, a fifth stop valve 12, a sixth stop valve 13, a compressor 14, a condenser 15, a condensing fan 16, a capillary tube 17, a heat regenerator 18, a seventh stop valve 19, an eighth stop valve 20, and a power supply 21.

[0056] The evaporator 2 is arranged at the lower side of the back plate in the refrigeration box 1, an evaporating fan 3 is arranged on the top of the evaporator 2, and three branches are arranged at the outlet of the evaporator 2, which are respectively a first branch, a second branch and a third branch.

[0057] Specifically, a transport pump 4, a first stop valve 5, a heating box 6, a heater 7 and a second stop valve 8 are arranged on the first branch, and the refrigerant in the first branch flows back to the inlet of the evaporator 2 through the above structures in sequence.

[0058] The second branch is provided with a transport pump 4, a third stop valve 9, a heat exchanger 10, and a fourth stop valve 11, and the refrigerant in the second branch is sequentially refluxed through the above structures to the inlet of the evaporator 2. The heat exchanger 10 is connected to a refrigerant circulation pipeline, and the refrigerant circulation pipeline is provided with a sixth stop valve 13, a regenerator 18, a compressor 14, a condenser 15, a capillary tube 17, an eighth stop valve 20 and the heat exchanger 10, and the refrigerant circulates in the circulation pipeline, and a condensing fan 16 is provided on one side of the condenser 15.

[0059] The third branch is provided with a fifth stop valve 12, a regenerator 18, a compressor 14, a condenser 15, a capillary tube 17 and a seventh stop valve 19. The refrigerant in the third branch flows back to the inlet of the evaporator 2 through the above structures in sequence.

[0060] The data acquisition and control system includes: a controller 22, a collector 23, a workstation 24, a gas composition analyzer 25, a differential pressure sensor 33, an ambient temperature and humidity probe 34, an in-box temperature control sensor 35, a first temperature and humidity probe 36, a second temperature and humidity probe 37, a third temperature and humidity probe 38, a fourth temperature and humidity probe 39, and a fifth temperature and humidity probe 40.

[0061] Among them, the controller 22, the collector 23, the workstation 24 and the gas composition analyzer 25 are arranged around the outside of the refrigeration box 1. The controller 22, the collector 23 and the gas composition analyzer 25 are connected to the workstation 24 through a signal line, and the gas composition analyzer 25 is connected to the refrigeration box 1 through an exhaust pipe 31 and a return air pipe 32. The collector 23 is connected to a pressure difference sensor 33, an environmental temperature and humidity probe 34, an in-box temperature control sensor 35 and multiple temperature and humidity probes through a signal line. The controller 22 is connected to the evaporation fan 3, the transport pump 4, the heater 7, the compressor 14, and the condensing fan 16 through a signal line. The controller 22 can adjust the opening and closing and operating conditions of the above structures.

[0062] The temperature T detected by the temperature control sensor 35 in the box c As the temperature control point inside the refrigeration box 1, the coordinates are There are five temperature and humidity probes, namely, a first temperature and humidity probe 36, a second temperature and humidity probe 37, a third temperature and humidity probe 38, a fourth temperature and humidity probe 39 and a fifth temperature and humidity probe 40. The first temperature and humidity probe 36, the second temperature and humidity probe 37 and the third temperature and humidity probe 38 are arranged diagonally along the refrigeration box 1, and the coordinates are respectively The average temperature of the three points and humidity average are the characteristic temperature and humidity of the air area in the box, respectively, and x0, y0, z0 are the length, width and height of the cavity inside the refrigeration box 1. The fourth temperature and humidity probe 39 is arranged at the air outlet of the evaporator 2, and the fifth temperature and humidity probe 40 is arranged at the return air outlet of the evaporator 2.

[0063] The permeation tracer system includes: a gas storage tank 26 (the gas in the tank is the tracer gas), a gas pressure regulating valve 27, a first gas shut-off valve 28, a second gas shut-off valve 29, a gas transmission pipeline 30, a gas extraction pipeline 31, a gas return pipeline 32, a suction pump 41, and a flow meter 42.

[0064] Specifically, the outlet of the gas storage tank 26 is connected to the gas pipeline 30. A gas pressure regulating valve 27 is provided on the main pipe of the gas pipeline 30 for adjusting the outlet pressure. The gas pipeline 30 is provided with two branches. One branch is placed outside the refrigeration box 1 and is provided with a first gas shut-off valve 28. The other branch extends into the refrigeration box 1 and is provided with a second gas shut-off valve 29. An air suction pump 41 and a flow meter 42 are provided on the gas composition analyzer 25. Under the suction action of the air suction pump 41, the gas in the refrigeration box 1 enters the gas composition analyzer 25 for detection and then flows back to the refrigeration box 1.

[0065] The branch interface of the gas delivery pipeline 30 located inside the refrigeration box 1 is close to the evaporation fan 3. The coordinates of this branch interface are The coordinates of the three branch interfaces of the exhaust pipe 31 located inside the refrigeration box 1 are respectively The coordinates of the branch interface of the return air duct 32 located inside the refrigeration box 1 are

[0066] The inventors found that during the operation of the refrigeration device, humid air will frost in the inner tank, drawer, and evaporator. Although the channels for humid air to enter and exit the box are the same, the transmission direction of humid air is opposite, and the resistance characteristics exhibited are also different, resulting in inconsistent permeation rates. In the prior art, the commonly used permeation test method is bidirectional average measurement, that is, during the operation of the refrigeration device, tracer gas is directly filled into the box, and the concentration decay rate of the tracer gas is used to fit the average permeation of humid air entering and exiting. However, this measurement method is difficult to measure the permeation of humid air entering or exiting alone.

[0067] See also Figure 1-Figure 2 A method for measuring wet air permeability of a refrigeration device cabinet using a refrigeration device cabinet comprises:

[0068] S1. Test the permeation volume caused by the positive pressure difference during the temperature rise in the refrigeration box 1, connect it to the ambient air, and test the tracer gas background concentration c in the environment through the component analyzer 25. atm The valve on the gas pipeline 30 is adjusted to observe the real-time concentration c change curve of the tracer gas. When the concentration value reaches the target value c0, the tracer gas is stopped from being transported into the refrigeration box 1, and the refrigeration box 1 is driven to enter the gradual heating mode. The wet air exchange rate of the heating process and the temperature maintenance process is fitted by the straight line method, the heating rate and heating temperature of the refrigeration box 1 are adjusted, and the wet air exchange rate generated by the positive pressure difference under different temperature and humidity difference conditions is tested.

[0069] The specific steps include:

[0070] S11, open the first stop valve 5 and the second stop valve 8, and close the remaining stop valves.

[0071] S12, open the door of the shielding box 43 to connect with the ambient air, and turn on the gas composition analyzer 25 to test the tracer gas background concentration c in the environment. atm Change curve.

[0072] S13, close the first gas shut-off valve 28 on the gas pipeline 30, open the second gas shut-off valve 29, open the gas pressure regulating valve 27, turn on the evaporating fan 3, the gas composition analyzer 25 and the suction pump 41, observe the real-time concentration c change curve of the tracer gas of the gas composition analyzer 25, and close the second gas shut-off valve 29 until the concentration value reaches the target value c0.

[0073] S14, start the transport pump 4 and the heater 7, the refrigeration box 1 enters the gradual heating mode, the system pipeline working medium is the coolant, turn on the power supply 21 to supply power to the heater 7, adjust the power of the heater 7, so that the temperature T detected by the temperature control sensor 35 in the box c Gradually from the initial ambient temperature T eGradually heat to the preset heating temperature T h , and maintain for a period of time Δt r .

[0074] S15, record the temperature inside the refrigeration box 1 from T e To T s And maintain for a period of time Δt r The tracer gas concentration c change curve, the pressure difference sensor 33, the ambient temperature and humidity probe 34, the first temperature and humidity probe 36, the second temperature and humidity probe 37, and the third temperature and humidity probe 38 are calculated using the formula ln(cc atm )=-I×t+ln(c0-c atm ) The straight-line method is used to fit the wet air exchange rate I during the heating process and the temperature maintenance process.

[0075] S16. Repeat steps S11 to S15, adjust the heating rate and heating temperature of the refrigeration box 1 by adjusting the power of the heater 7, and test the wet air exchange rate I generated by the positive pressure difference under different temperature and humidity difference conditions.

[0076] S2. Test the permeation volume caused by the negative pressure difference during the cooling process in the refrigeration box 1. It is not connected to the ambient air and records the tracer gas background concentration c in the refrigeration box 1. atm , the change curve of the ambient temperature and humidity probe 34, the first temperature and humidity probe 36, the second temperature and humidity probe 37, and the third temperature and humidity probe 38, adjust the valve on the gas pipeline 30, observe the change curve of the real-time concentration c of the tracer gas, drive the refrigeration box 1 to enter the gradual cooling mode, fit the wet air exchange rate of the cooling process and the temperature maintenance process through the straight line method, adjust the cooling rate and refrigeration temperature of the refrigeration box 1, and test the wet air exchange rate caused by the negative pressure difference under different temperature and humidity difference conditions.

[0077] The specific steps include:

[0078] S21, open the third stop valve 9, the fourth stop valve 11, the sixth stop valve 13, and the eighth stop valve 20, and close the remaining stop valves.

[0079] S22, close the door of the shielding box 43 to cut off the connection with the ambient air, turn on the gas composition analyzer 25, and record the tracer gas background concentration c in the refrigeration box 1 atm , the changing curves of the ambient temperature and humidity probe 34 , the first temperature and humidity probe 36 , the second temperature and humidity probe 37 , and the third temperature and humidity probe 38 .

[0080] S23, close the second gas shut-off valve 29 on the gas transmission pipeline 30, open the first gas shut-off valve 28, open the gas pressure regulating valve 27 for a period of time, then close the gas pressure regulating valve 27 and the first gas shut-off valve 28, turn on the gas composition analyzer 25 and the suction pump 41, and observe the tracer gas real-time concentration c change curve of the gas composition analyzer 25.

[0081] S24, start the compressor 14 and the condensing fan 16, the temperature of the heat exchanger 10 drops, start the transport pump 4 and the evaporating fan 3, the temperature of the evaporator 2 drops, the refrigeration box 1 enters the gradual cooling mode, the system pipeline working medium is the refrigerant, adjust the speed of the compressor 14, so that the temperature T detected by the temperature control sensor 35 in the box c Gradually from the initial ambient temperature T e Gradually cool down to the preset cooling temperature T c , and maintain for a period of time Δt d .

[0082] S25, record the temperature in the refrigeration box 1 from T e To T c And maintain for a period of time Δt d The tracer gas concentration c change curve and the pressure difference sensor 33 change curve are calculated by using the formula ln(cc atm )=-I×t+ln(c0-c atm ) The straight line method is used to fit the wet air exchange rate I during the cooling process and the temperature maintenance process.

[0083] S26, repeating steps S21 to S25, adjusting the cooling rate and cooling temperature of the refrigeration box 1 by adjusting the rotation speed of the compressor 14, and testing the wet air exchange rate I generated by the negative pressure difference under different temperature and humidity difference conditions.

[0084] S3, testing the permeation volume generated by the periodic positive and negative pressure difference during the intermittent refrigeration process in the refrigeration box 1, driving the refrigeration box 1 to cool down and enter the intermittent refrigeration mode, connecting with the ambient air, and testing the tracer gas background concentration c in the environment through the gas composition analyzer 25 atm The valve on the gas pipeline 30 is adjusted to observe the change curve of the real-time concentration c of the tracer gas. When the concentration reaches the target value c0, the tracer gas is stopped from being transported into the refrigeration box 1. The two-way average exchange rate of wet air in the intermittent refrigeration process is fitted by the straight line method. The dehumidification capacity of the evaporator 2 is calculated, the temperature fluctuation amplitude and frequency of the refrigeration box 1 are adjusted, and the wet air exchange rate generated by the positive and negative pressure differences under different temperature and humidity difference conditions is tested.

[0085] The specific steps include:

[0086] S31, open the fifth stop valve 12 and the seventh stop valve 19, and close the remaining stop valves.

[0087] S32, turn on the evaporator fan 3, the compressor 14 and the condensing fan 16, the temperature of the evaporator 2 drops, and the refrigeration box 1 enters the intermittent refrigeration mode after the temperature drops. The working medium of the system pipeline is the refrigerant, and the start and stop states of the evaporator fan 3, the compressor 14 and the condensing fan 16 are controlled. The temperature range is preset in the controller 22, so that the temperature T detected by the temperature control sensor 35 in the box c In [T low ,T up ] changes.

[0088] S33, open the door of the shielding box 43 to connect it to the ambient air, and turn on the gas composition analyzer 25 to test the tracer gas background concentration c in the environment. atm Change curve.

[0089] S34, close the first gas shut-off valve 28 on the gas pipeline 30, open the second gas shut-off valve 29, open the gas pressure regulating valve 27, turn on the evaporating fan 3, turn on the gas composition analyzer 25 and the micro suction pump 41, observe the real-time concentration c change curve of the tracer gas of the gas composition analyzer 25, until the concentration value reaches the target value c0, and then close the second gas shut-off valve 29.

[0090] S35, record the change curve of the tracer gas concentration c of the refrigeration box 1 during intermittent refrigeration, the change curve of the pressure difference sensor 33, the ambient temperature and humidity probe 34, the first temperature and humidity probe 36, the second temperature and humidity probe 37, the third temperature and humidity probe 38, the fourth temperature and humidity probe 39, and the fifth temperature and humidity probe 40, using the formula ln(cc atm )=-I×t+ln(c0-c atm ) The straight line method is used to fit the two-way average exchange rate I of wet air in the intermittent refrigeration process, and the dehumidification capacity of the evaporator 2 is calculated based on the fourth temperature and humidity probe 39 and the fifth temperature and humidity probe 40.

[0091] S36, repeating steps S31 to S35, adjusting the temperature fluctuation amplitude and frequency of the refrigeration box 1 by adjusting the preset temperature of the controller 22, and testing the wet air exchange rate I generated by the positive and negative pressure differences under different temperature and humidity difference conditions.

[0092] In the present application, the humid air can be measured by switching forward and reverse directions, so as to measure the permeability separately and restore the real humid air transmission path. The separate measurement of the permeability can more accurately obtain the specific value of the humid air entering or exhausting. The direct measurement of the humid air entering and exhausting can avoid errors caused by external factors or complex system interference. Especially when a detailed quantitative analysis of the subsequent permeability is required, the separate measurement provides more direct and accurate data, and can also avoid the influence of the mixing effect, making the measurement results more representative.

[0093] In addition, the wet air infiltration can be switched between steady state and dynamic, and the steady state infiltration and the average infiltration in dynamic state can be measured according to demand. In the actual operation of the refrigeration box 1, the infiltration of wet air will change due to factors such as the load of the refrigeration device, changes in external temperature, and cooling load. By switching the measurement between steady state and dynamic modes, the wet air infiltration under different working conditions can be accurately grasped. The steady state infiltration is suitable for stable conditions during long-term operation, and can reflect the infiltration behavior of the refrigeration device under continuous load, helping to evaluate the long-term stability and efficiency of the refrigeration device. The dynamic infiltration is suitable for situations where the load fluctuates greatly or changes in a short period of time, and can help analyze the response and adaptability of the refrigeration device under load changes. Moreover, the steady-state infiltration measurement can provide a benchmark to help design engineers evaluate the operating efficiency of the refrigeration device under normal load, and provide a basis for energy efficiency optimization under long-term operation. By understanding the average infiltration in dynamic state, the refrigeration device can adjust the operating parameters in time when the load changes, and optimize energy consumption.

[0094] During the permeation measurement, the refrigeration temperature can be adjusted to facilitate the measurement of steady-state and dynamic permeation at different refrigeration temperatures. In the actual operation of the refrigeration box 1, changes in temperature often cause changes in the amount of wet air permeation. By adjusting the refrigeration temperature during the measurement, the performance of the system under different working conditions can be simulated, helping engineers understand the permeation characteristics of the system under different temperature and load conditions. This is important for ensuring the operating stability and efficiency of the refrigeration unit in various actual environments. Under steady-state conditions, the temperature is relatively constant, and the long-term operating efficiency of the system at a fixed temperature can be evaluated. Under dynamic conditions, the temperature adjustment process simulates load fluctuations, which can analyze the adaptability and response speed of the refrigeration unit in response to temperature changes.

[0095] The following are specific experiments and experimental data using this system and method:

[0096] See also Figure 3-Figure 7 As shown, taking the BD-226WL air-cooled refrigerator as an example, the refrigeration device cabinet wet air permeation measurement system in this application is installed, which specifically includes a cold and heat generation system, a data acquisition and control system, and a permeation tracer system (using CO2 as a tracer source). The test refrigerator is in a closed state, equipped with 5 different magnetic strip thickness door seals, and the wet air permeation rate of the refrigerator is tested using tracer gas under intermittent cooling positive and negative pressure difference, heating positive pressure difference, and cooling negative pressure difference conditions by switching the switch of the execution structure.

[0097] See also Figure 8-Figure 9 As shown, taking the experimental door seal with a magnetic strip thickness of m1 as an example, Figure 8 During the three hours of measurement, the CO2 concentration dropped from about 980 ppm to about 830 ppm, and the wet air exchange rate fitted by the straight line method was 0.1175 h-1 , the penetration rate of moist air is further calculated to be 20.036 g·h -1 . Fig. 9 It can be seen that temperature, relative humidity, pressure difference and power change periodically with the start and stop of the compressor. The positive and negative pressure difference changes caused by temperature changes are the driving force for the penetration of moist air.

[0098] In this embodiment, specific experimental data of the wet air permeation rate of refrigerators equipped with door seals of different magnetic strip thicknesses are shown in the following table:

[0099] Table 1 Wet air permeation rate of refrigerators with different magnetic strip thickness door seals

[0100]

[0101] From the table above, we can see that as the thickness of the door seal magnetic strip increases, the sealing force of the refrigerator door increases, that is, the sealing performance improves. Under the intermittent refrigeration positive and negative pressure difference conditions, the wet air penetration rate is 10.402g·h -1 ~20.036g·h -1 ; Under the condition of temperature rise and positive pressure difference, the wet air permeability rate is 7.145g·h -1 ~15.313g·h -1 ; Under the cooling negative pressure difference condition, the wet air penetration rate is 13.829g·h -1 ~25.578g·h -1 The moist air permeability rate generated by the negative pressure difference during cooling is greater than the moist air permeability rate generated by the positive pressure difference during heating, so the moist air permeability rate under the intermittent cooling positive and negative pressure difference conditions is between the two.

[0102] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made according to the scope of application of the present invention should still fall within the scope of the claims of the present invention.

Claims

1. A refrigeration device cabinet wet air permeation measurement system, characterized in that: include: A heat and cold generating system, which is used to simulate the working environment of a refrigeration device and to induce the penetration process of moist air by adjusting the temperature change; A data acquisition and control system, which is used to collect and monitor the temperature, humidity and permeability parameters of the cold and heat generating system during the simulation process; An infiltration tracing system for tracking and quantifying the infiltration path and rate of moist air; The cold and heat generating system comprises: a refrigeration box (1), an evaporator (2) is arranged in the refrigeration box (1), an evaporation fan (3) is arranged on the top of the evaporator (2), and three branches are arranged at the outlet of the evaporator (2), the three branches are respectively a first branch, a second branch and a third branch; The first branch is provided with a transport pump (4), a first stop valve (5), a heating box (6), a heater (7) and a second stop valve (8), and the refrigerant in the first branch flows back to the inlet of the evaporator (2) through the above structures in sequence; The transport pump (4), the third stop valve (9), the heat exchanger (10), and the fourth stop valve (11) are arranged on the second branch, and the refrigerant flows back to the inlet of the evaporator (2) in sequence through the above-mentioned structures in the second branch, and the heat exchanger (10) is connected to a refrigerant circulation pipeline; The third branch is provided with a fifth stop valve (12), a regenerator (18), a compressor (14), a condenser (15), a capillary tube (17) and a seventh stop valve (19), and the refrigerant in the third branch flows back to the inlet of the evaporator (2) through the above structures in sequence; The data acquisition and control system comprises: a controller (22), a collector (23), a workstation (24) and a gas composition analyzer (25) arranged outside the refrigeration box (1); the controller (22), the collector (23) and the gas composition analyzer (25) are all connected to the workstation (24) via a signal line; the gas composition analyzer (25) and the refrigeration box (1) are connected via an exhaust pipe (31) and an air return pipe (32); The collector (23) is connected to a differential pressure sensor (33), an ambient temperature and humidity probe (34), an in-box temperature control sensor (35) and a plurality of temperature and humidity probes via signal lines; The permeation tracing system comprises: a gas storage tank (26), the outlet of the gas storage tank (26) is connected to a gas pipeline (30), a gas pressure regulating valve (27) is arranged on the main pipe of the gas pipeline (30) for adjusting the outlet pressure, the gas pipeline (30) is provided with two branches, one branch is placed outside the refrigeration box (1) and is provided with a first gas stop valve (28), and the other branch extends into the refrigeration box (1) and is provided with a second gas stop valve (29), and the gas composition analyzer (25) is provided with an air suction pump (41) and a flow meter (42), and under the suction action of the air suction pump (41), the gas in the refrigeration box (1) enters the gas composition analyzer (25) for detection and then flows back into the refrigeration box (1).

2. A refrigeration device cabinet wet air permeation measurement system according to claim 1, characterized in that: The temperature T detected by the temperature control sensor (35) in the box c As the temperature control point inside the refrigeration box (1), the coordinates are The temperature and humidity probes are provided with five, namely a first temperature and humidity probe (36), a second temperature and humidity probe (37), a third temperature and humidity probe (38), a fourth temperature and humidity probe (39) and a fifth temperature and humidity probe (40), wherein the first temperature and humidity probe (36), the second temperature and humidity probe (37) and the third temperature and humidity probe (38) are arranged diagonally along the refrigeration box (1), and the coordinates are respectively The average temperature of the three points and humidity average are the characteristic temperature and characteristic humidity of the air area in the box, respectively; x0, y0, z0 are the length, width and height of the internal cavity of the refrigeration box (1), respectively.

3. A refrigeration device cabinet wet air permeation measurement system according to claim 2, characterized in that: The fourth temperature and humidity probe (39) is arranged at the air outlet of the evaporator (2), and the fifth temperature and humidity probe (40) is arranged at the air return outlet of the evaporator (2).

4. A refrigeration device cabinet wet air permeation measurement system according to claim 1, characterized in that: The branch interface of the gas delivery pipeline (30) located inside the refrigeration box (1) is close to the evaporation fan (3). The coordinates of this branch interface are The coordinates of the three branch interfaces of the exhaust pipe (31) located inside the refrigeration box (1) are respectively The branch interface coordinates of the return air duct (32) located inside the refrigeration box (1) are 5. A method for using the refrigeration device cabinet wet air permeation measurement system according to any one of claims 1 to 4, characterized in that: include: S1. Testing the permeation volume generated by the positive pressure difference during the temperature rise process in the refrigeration box (1), connecting it to the ambient air, and testing the tracer gas background concentration c in the environment through the component analyzer (25). atm The temperature of the refrigeration box (1) is adjusted by adjusting the valve on the gas transmission pipeline (30), and the real-time concentration c change curve of the tracer gas is observed. When the concentration value reaches the target value c0, the tracer gas is stopped from being transported into the refrigeration box (1), and the refrigeration box (1) is driven to enter a gradual heating mode. The wet air exchange rate of the heating process and the temperature maintenance process is fitted by the linear method, and the heating rate and heating temperature of the refrigeration box (1) are adjusted to test the wet air exchange rate generated by the positive pressure difference under different temperature and humidity difference conditions; S2. Test the permeation volume generated by the negative pressure difference during the cooling process in the refrigeration box (1), which is not connected to the ambient air, and record the tracer gas background concentration c in the refrigeration box (1). atm , the change curves of the ambient temperature and humidity probe (34), the first temperature and humidity probe (36), the second temperature and humidity probe (37), and the third temperature and humidity probe (38), adjusting the valve on the gas transmission pipeline (30), observing the change curve of the real-time concentration c of the tracer gas, driving the refrigeration box (1) to enter a gradual cooling mode, fitting the wet air exchange rate of the cooling process and the temperature maintenance process by the linear method, adjusting the cooling rate and the cooling temperature of the refrigeration box (1), and testing the wet air exchange rate generated by the negative pressure difference under different temperature and humidity difference conditions; S3, testing the permeation volume generated by the periodic positive and negative pressure differences during the intermittent refrigeration process in the refrigeration box (1), driving the refrigeration box (1) to cool down and enter the intermittent refrigeration mode, connecting with the ambient air, and testing the tracer gas background concentration c in the environment through the gas composition analyzer (25) atm The change curve of the tracer gas concentration c is obtained by adjusting the valve on the gas transmission pipeline (30), and the real-time change curve of the tracer gas concentration c is observed. When the concentration value reaches the target value c0, the tracer gas is stopped from being transported into the refrigeration box (1). The two-way average exchange rate of wet air in the intermittent refrigeration process is fitted by the linear method, the dehumidification capacity of the evaporator (2) is calculated, the temperature fluctuation amplitude and frequency of the refrigeration box (1) are adjusted, and the wet air exchange rate generated by the positive and negative pressure differences under different temperature and humidity difference conditions is tested.

6. The method according to claim 5, characterized in that In the step S1, it includes: S11, open the first stop valve (5) and the second stop valve (8), and close the remaining stop valves; S12, open the door of the shielding box (43) to connect to the ambient air, and turn on the gas composition analyzer (25) to test the tracer gas background concentration c in the environment. atm Change curve; S13, closing the first gas stop valve (28) on the gas transmission pipeline (30), opening the second gas stop valve (29), opening the gas pressure regulating valve (27), opening the evaporation fan (3), the gas composition analyzer (25) and the suction pump (41), observing the real-time concentration c change curve of the tracer gas on the gas composition analyzer (25), and closing the second gas stop valve (29) when the concentration value reaches the target value c0; S14, the transport pump (4) and the heater (7) are started, the refrigeration box (1) enters a gradual temperature rise mode, the working medium of the system pipeline is the coolant, the power supply (21) is turned on to supply power to the heater (7), and the power of the heater (7) is adjusted so that the temperature T detected by the temperature control sensor (35) in the box reaches c Gradually from the initial ambient temperature T e Gradually heat to the preset heating temperature T h , and maintain for a period of time Δt r ; S15, record the temperature inside the refrigeration box (1) from T e To T s And maintain for a period of time Δt r The tracer gas concentration c change curve, the pressure difference sensor (33), the ambient temperature and humidity probe (34), the first temperature and humidity probe (36), the second temperature and humidity probe (37), and the third temperature and humidity probe (38) are calculated by using the formula ln(cc atm )=-I×t+ln(c0-c atm ) Linear method to fit the wet air exchange rate I during the heating process and the temperature maintenance process; S16. Repeat steps S11 to S15, adjust the heating rate and heating temperature of the refrigeration box (1) by adjusting the power of the heater (7), and test the wet air exchange rate I generated by the positive pressure difference under different temperature and humidity difference conditions.

7. The method according to claim 5, characterized in that In the step S2, it includes: S21, open the third stop valve (9), the fourth stop valve (11), the sixth stop valve (13), and the eighth stop valve (20), and close the remaining stop valves; S22, close the door of the shielding box (43) to cut off the connection with the ambient air, turn on the gas composition analyzer (25), and record the tracer gas background concentration c in the refrigeration box (1). atm , change curves of the ambient temperature and humidity probe (34), the first temperature and humidity probe (36), the second temperature and humidity probe (37), and the third temperature and humidity probe (38); S23, closing the second gas stop valve (29) on the gas transmission pipeline (30), opening the first gas stop valve (28), opening the gas pressure regulating valve (27) for a period of time, closing the gas pressure regulating valve (27) and the first gas stop valve (28), opening the gas composition analyzer (25) and the suction pump (41), and observing the tracer gas real-time concentration c change curve of the gas composition analyzer (25); S24, the compressor (14) and the condensing fan (16) are turned on, the temperature of the heat exchanger (10) drops, the transport pump (4) and the evaporating fan (3) are turned on, the temperature of the evaporator (2) drops, the refrigeration box (1) enters a gradual cooling mode, the working medium of the system pipeline is the refrigerant, the speed of the compressor (14) is adjusted, and the temperature detected by the temperature control sensor (35) in the box reaches T c Gradually from the initial ambient temperature T e Gradually cool down to the preset cooling temperature T c , and maintain for a period of time Δt d ; S25, record the temperature inside the refrigeration box (1) from T e To T c And maintain for a period of time Δt d The tracer gas concentration c change curve and the pressure difference sensor (33) change curve are calculated by using the formula ln(cc atm )=-I×t+ln(c0-c atm ) Linear method to fit the wet air exchange rate I during the cooling process and the temperature maintenance process; S26. Repeat steps S21 to S25 to adjust the cooling rate and cooling temperature of the refrigeration box (1) by adjusting the rotation speed of the compressor (14), and test the wet air exchange rate I generated by the negative pressure difference under different temperature and humidity difference conditions.

8. The method according to claim 5, characterized in that In the step S3, it includes: S31, open the fifth stop valve (12) and the seventh stop valve (19), and close the remaining stop valves; S32, the evaporating fan (3), the compressor (14) and the condensing fan (16) are turned on, the temperature of the evaporator (2) drops, and the refrigeration box (1) enters the intermittent refrigeration mode after the temperature drops. The working medium of the system pipeline is the refrigerant, and the start and stop states of the evaporating fan (3), the compressor (14) and the condensing fan (16) are controlled. A temperature range is preset in the controller (22) so that the temperature T detected by the temperature control sensor (35) in the box is c In [T low ,T up ] changes; S33, open the door of the shielding box (43) to connect to the ambient air, and turn on the gas composition analyzer (25) to test the tracer gas background concentration c in the environment atm Change curve; S34, closing the first gas stop valve (28) on the gas transmission pipeline (30), opening the second gas stop valve (29), opening the gas pressure regulating valve (27), turning on the evaporation fan (3), turning on the gas composition analyzer (25) and the micro suction pump (41), observing the real-time concentration c change curve of the tracer gas on the gas composition analyzer (25), and when the concentration value reaches the target value c0, closing the second gas stop valve (29); S35, recording the change curve of the tracer gas concentration c in the refrigeration box (1) during intermittent refrigeration, the change curve of the pressure difference sensor (33), the ambient temperature and humidity probe (34), the first temperature and humidity probe (36), the second temperature and humidity probe (37), the third temperature and humidity probe (38), the fourth temperature and humidity probe (39), and the fifth temperature and humidity probe (40), using the formula ln(cc atm )=-I×t+ln(c0-c atm ) using a straight line method to fit the average two-way exchange rate I of wet air in the intermittent refrigeration process, and calculating the dehumidification capacity of the evaporator (2) based on the fourth temperature and humidity probe (39) and the fifth temperature and humidity probe (40); S36, repeating steps S31 to S35, adjusting the temperature fluctuation amplitude and frequency of the refrigeration box (1) by adjusting the preset temperature of the controller (22), and testing the wet air exchange rate I generated by the positive and negative pressure differences under different temperature and humidity difference conditions.

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