A refrigeration unit cabinet wet air permeation measurement system and method

Abstract

The application discloses a kind of refrigeration device box wet air permeation measurement system, comprising: cold heat generation system, cold heat generation system is used to simulate the working environment of refrigeration device, and the permeation process of wet air is caused by adjusting temperature change;Data acquisition and control system, data acquisition and control system are used to collect and monitor the temperature and humidity and permeation amount parameters of cold heat generation system in simulation process;Permeation tracing system, permeation tracing system is used to track and quantify the permeation path and rate of wet air.In the present application, wet air can be measured forward and backward, so as to measure the permeation amount alone, restore the real wet air transmission path, provide more direct and accurate data, avoid the influence of mixing effect, make the measurement result more representative, facilitate evaluation and control the influence of wet air on the performance and long-term stability of refrigeration device.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refrigeration device wet air permeation detection, and specifically relates to a refrigeration device box wet air permeation measurement system and method. BACKGROUND

[0002] During the operation of a refrigeration device (such as a refrigerator, a freezer, etc.), the periodic start and stop of the compressor cause the temperature and pressure difference in the box to change periodically, thereby causing the wet air inside and outside the box to be transferred. The transfer path is usually the door seal and the defrosting drain hole. During the cooling phase of the compressor operation, the inside of the box is generally under negative pressure, and the outside wet air enters the inside of the box through the door seal and the defrosting drain pipe. During the warming phase of the compressor operation, the inside of the box is generally under positive pressure, and the wet air in the box is discharged to the outside environment through the door seal and the defrosting drain pipe. Under such reciprocating action, the wet air will frost on the inner liner, the drawer, and the evaporator, which not only affects the operation energy consumption, but also causes reliability problems such as condensation and icing.

[0003] Therefore, it is necessary to measure the permeation of the wet air in the refrigeration device box to evaluate and control the influence of the wet air on the performance and long-term stability of the device. SUMMARY

[0004] The present application relates to the technical field of refrigeration device wet air permeation detection, and specifically relates to a refrigeration device box wet air permeation measurement system and method.

[0005] The purpose of the present application can be achieved by the following technical solutions:

[0006] A refrigeration device box wet air permeation measurement system comprises:

[0007] The cold and heat generating system is used for simulating the working environment of a refrigeration device, and induces the permeation process of wet air by adjusting temperature change; the data acquisition and control system is used for collecting and monitoring the temperature and humidity and permeation amount parameters of the cold and heat generating system in the simulation process; the permeation tracing system is used for tracing and quantifying the permeation path and rate of wet air; the cold and heat generating system comprises: a refrigeration box body, an evaporator is arranged in the refrigeration box body, an evaporating fan is arranged at the top of the evaporator, three branches are arranged at the outlet of the evaporator, and the three branches are a first branch, a second branch and a third branch; a transport pump, a first stop valve, a heating box, a heater and a second stop valve are arranged on the first branch, and the refrigerant in the first branch is returned to the inlet of the evaporator in sequence through the above structures; the transport pump, a third stop valve, a heat exchanger and a fourth stop valve are arranged on the second branch, the refrigerant in the second branch is returned to the inlet of the evaporator in sequence through the above structures, and the heat exchanger is connected with a refrigerant circulation pipeline; a fifth stop valve, a regenerator, a compressor, a condenser, a capillary tube and a seventh stop valve are arranged on the third branch, and the refrigerant in the third branch is returned to the inlet of the evaporator in sequence through the above structures; the data acquisition and control system comprises: a controller, an acquisition device, a workstation and a gas component analyzer arranged outside the refrigeration box body, the controller, the acquisition device and the gas component analyzer are connected with the workstation through signal lines, and the gas component analyzer is connected with the refrigeration box body through a gas extraction pipeline and a gas return pipeline; the acquisition device is connected with a differential pressure sensor, an environmental temperature and humidity probe, an in-box temperature control sensor and a plurality of temperature and humidity probes through signal lines; the permeation tracing system comprises: a gas storage tank, a gas pipeline is connected at the outlet of the gas storage tank, a gas pressure regulating valve is arranged on the gas pipeline main pipe for regulating the outlet gas pressure, the gas pipeline is provided with two branches, one branch is arranged outside the refrigeration box body and provided with a first gas stop valve, and the other branch extends into the refrigeration box body and provided with a second gas stop valve, a suction pump and a flow meter are arranged on the gas component analyzer, under the suction action of the suction pump, the gas in the refrigeration box body enters the gas component analyzer for detection and then returns to the refrigeration box body.

[0008] As a further scheme of the application: the temperature T c As the temperature control point inside the refrigeration box body, the coordinates are The temperature and humidity probe is provided with five temperature and humidity probes, namely a first temperature and humidity probe, a second temperature and humidity probe, a third temperature and humidity probe, a fourth temperature and humidity probe and a 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 body, and the coordinates are The average value of the three points and humidity average value respectively are the characteristic temperature and humidity of the air area in the box, x0, y0, z0 are the length, width and height of the internal cavity of the refrigeration box respectively.

[0009] As a further scheme of the present application: 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 air return port of the evaporator.

[0010] As a further scheme of the present application: the gas supply pipeline is located at a branch interface inside the refrigeration box body, and the branch interface is close to the evaporative fan, and the coordinates of the branch interface are The coordinates of the three branch interfaces of the gas extraction pipeline inside the refrigeration box body are The coordinates of the branch interfaces of the gas return pipeline inside the refrigeration box body are

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

[0012] S1, test the permeation amount generated by the positive pressure difference in the temperature rising process in the refrigeration box, and the environment air is communicated, test the background concentration c of the tracer gas in the environment by the component analyzer atm , adjust the valve on the gas supply pipeline, observe the real-time concentration c change curve of the tracer gas, stop delivering the tracer gas into the refrigeration box when the concentration value reaches the target value c0, drive the refrigeration box into the step-by-step temperature rising mode, fit the wet air exchange rate of the temperature rising process and the temperature maintaining process by the straight line method, adjust the temperature rising rate and the 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 amount generated by the negative pressure difference in the temperature falling process in the refrigeration box, and the environment air is not communicated, record the background concentration c of the tracer gas in the refrigeration box atm , the environment temperature and humidity probe, the first temperature and humidity probe, the second temperature and humidity probe, the third temperature and humidity probe change curve, adjust the valve on the gas supply pipeline, observe the real-time concentration c change curve of the tracer gas, drive the refrigeration box into the step-by-step temperature falling mode, fit the wet air exchange rate of the temperature falling process and the temperature maintaining process by the straight line method, adjust the temperature falling rate and the refrigeration temperature of the refrigeration box, and test the wet air exchange rate generated by the negative pressure difference under different temperature and humidity difference conditions;

[0014] S3, test the permeation amount generated by the periodic positive and negative pressure difference in the intermittent refrigeration process in the refrigeration box, drive the refrigeration box to enter the intermittent refrigeration mode after falling temperature, communicate with the environment air, test the background concentration c of the tracer gas in the environment by the gas component analyzer atmThe concentration c of the tracer gas is observed in real time, and the valve on the gas pipeline is adjusted until the concentration c reaches the target value c0, at which point the delivery of the tracer gas into the refrigeration box is stopped, the wet air two-way average exchange rate of the intermittent refrigeration process is fitted by linear method, the dehumidification amount of the evaporator is calculated, the temperature fluctuation amplitude and frequency of the refrigeration box are adjusted, and the wet air exchange rate generated by the positive and negative pressure differences under different temperature and humidity differences is tested.

[0015] As a further scheme of the present application, in the step S1, the following is included:

[0016] S11, opening the first and second stop valves and closing the remaining stop valves;

[0017] S12, opening the box door of the shield box to communicate with the ambient air, and opening the gas composition analyzer to test the background concentration c of the tracer gas in the environment atm change curve;

[0018] S13, closing the first gas stop valve on the gas pipeline, opening the second gas stop valve, opening the gas pressure regulating valve, opening the evaporative fan, the gas composition analyzer, and the air suction pump, observing the real-time concentration c change curve of the tracer gas of the gas composition analyzer, and closing the second gas stop valve when the concentration value reaches the target value c0;

[0019] S14, starting the transport pump and the heater, the refrigeration box enters the step-by-step heating mode, the system pipeline working medium is the refrigerant, the power supply is turned on to supply power to the heater, the power of the heater is adjusted, the temperature T detected by the temperature control sensor in the box gradually increases from the initial ambient temperature T c ; e to the preset heating temperature T h , and maintains for a period of time Δt r ;

[0020] S15, recording the concentration c change curve of the tracer gas in the refrigeration box from T e to T h and maintaining for a period of time Δt r , the change curves of 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, the wet air exchange rate I of the heating process and the temperature maintaining process is fitted by linear method using the formula ln(c-c atm )=-I×t+ln(c0-c atm );

[0021] S16, repeating steps S11-S15, adjusting the heating rate and heating temperature of the refrigeration box by adjusting the power of the heater, and testing the wet air exchange rate I generated by the positive pressure difference under different temperature and humidity differences.

[0022] As a further scheme of the present application, in the step S2, comprising:

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

[0024] S22, close the shield box door, and do not communicate with the ambient air, open the gas component analyzer, and record the background concentration c of the tracer gas in the refrigeration box atm , the change curve of the environmental 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, open the gas component analyzer and the suction pump, and observe the change curve of the real-time concentration c of the tracer gas of the gas component analyzer;

[0026] S24, open the compressor and the condenser fan, the temperature of the heat exchanger decreases, open the transport pump and the evaporator fan, the temperature of the evaporator decreases, the refrigeration box enters the gradual cooling mode, the working medium of the system pipeline is the refrigerant, adjust the speed of the compressor, and the temperature T c gradually decreases from the initial environmental temperature T e to the preset refrigeration temperature T c , and is maintained for a period of time Δt d ;

[0027] S25, record the change curve of the tracer gas concentration c, the pressure difference sensor change curve when the temperature in the refrigeration box changes from T e to T c and is maintained for a period of time Δt d , and the wet air exchange rate I of the cooling process and the temperature maintenance process is fitted by using the formula ln(c-c atm )=-I×t+ln(c0-c atm );

[0028] S26, repeat steps S21-S25, adjust the cooling rate and refrigeration 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 scheme of the present application, in the step S3, comprising:

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

[0031] S32, start the evaporative fan, compressor and condenser fan, the evaporator temperature drops, the refrigeration box body cools down and enters the intermittent refrigeration mode, the system pipeline working medium is refrigerant, the start-stop state of the evaporative fan, compressor and condenser fan is controlled, the temperature interval is preset in the controller, and the temperature T detected by the temperature control sensor in the box is controlled to be within the preset temperature interval c between [T low , T up ] changes;

[0032] S33, open the shield box door, communicate with the environment air, open the gas component analyzer to test the tracer gas background concentration c atm of the environment changes 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, start the evaporative fan, start the gas component analyzer and the micro-suction pump, observe the tracer gas concentration c change curve of the gas component analyzer, and when the concentration value reaches the target value c0, close the second gas stop valve;

[0034] S35, record the tracer gas concentration c change curve of the refrigeration box in the intermittent refrigeration process, the change curve of the pressure difference sensor, the environment 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, and the wet air two-way average exchange rate I of the intermittent refrigeration process is fitted by using the formula ln (c-c atm ) = -I * t + ln (c0-c atm ), and the dehumidification amount of the evaporator is calculated according to the fourth temperature and humidity probe and the fifth temperature and humidity probe;

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

[0036] The beneficial effects of the present application are:

[0037] (1) In the present application, the wet air can be measured in positive and negative directions, so as to measure the permeation amount alone, restore the real wet 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 wet air on the performance and long-term stability of the refrigeration device.

[0038] (2) In the present application, the wet air permeation is switched between steady state and dynamic state, the steady state permeation amount and the average permeation amount in dynamic state are measured according to the demand, and the wet air permeation amount under different working conditions is accurately mastered by switching measurement in the steady state and dynamic state, 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 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 with reference to the accompanying drawings.

[0041] Figure 1 It is a structural schematic diagram of the 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 cabinet using the present invention;

[0043] Figure 3 This 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 This 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 This 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 This 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 This 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 Schematic diagram of CO2 concentration change and fitting curve during the measurement process of positive and negative pressure difference working conditions of intermittent refrigeration of the present invention;

[0049] Figure 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 picture:

[0051] 1, refrigeration box; 2, evaporator; 3, evaporative 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; 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 stop valve; 29, second gas stop valve; 30, gas pipeline; 31, gas extraction pipeline; 32, gas return pipeline; 33, differential pressure sensor; 34, ambient temperature and humidity probe; 35, in-box temperature control sensor; 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, shielded box. DETAILED DESCRIPTION

[0052] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0053] Please refer to Figure 1 As shown in the figure, the present application is a kind of refrigeration device box wet air permeation measurement system, comprising: shielded box 43, shielded box 43 inside setting cold and heat generation system, data acquisition and control system and permeation tracing system.

[0054] Among them, the cold and heat generation system is used to simulate the working environment of the refrigeration device, and the permeation process of the wet air is induced by adjusting the temperature change. The data acquisition and control system is used to collect and monitor the temperature and humidity and permeation parameters of the cold and heat generation system in the simulation process. The permeation tracing system is used to track and quantify the permeation path and rate of the wet air.

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

[0056] The evaporator 2 is arranged at the lower side of the back plate in the refrigeration box 1, and the evaporating fan 3 is arranged at the top of the evaporator 2. 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, the first branch is provided with the transport pump 4, the first stop valve 5, the heating box 6, the heater 7 and the second stop valve 8. The coolant in the first branch is sequentially returned to the inlet of the evaporator 2 through the above-mentioned structures.

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

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

[0060] The data acquisition and control system comprises a controller 22, an acquisition device 23, a workstation 24, a gas component analyzer 25, a differential pressure sensor 33, an environmental 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] The controller 22, the acquisition device 23, the workstation 24 and the gas component analyzer 25 are arranged outside the refrigeration box 1. The controller 22, the acquisition device 23 and the gas component analyzer 25 are connected to the workstation 24 through signal lines. The gas component analyzer 25 is connected to the refrigeration box 1 through the air extraction pipeline 31 and the air return pipeline 32. The acquisition device 23 is connected to the differential pressure sensor 33, the environmental temperature and humidity probe 34, the in-box temperature control sensor 35 and the multiple temperature and humidity probes through signal lines. The controller 22 is connected to the evaporating fan 3, the transport pump 4, the heater 7, the compressor 14 and the condensing fan 16 through signal lines. The controller 22 can adjust the opening and closing and the running state of the above-mentioned structures.

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

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

[0064] Specifically, the gas storage tank 26 is connected to the gas pipeline 30 at the outlet, the gas pipeline 30 is provided with a gas pressure regulating valve 27 for regulating the outlet gas pressure, the gas pipeline 30 is provided with two branches, one branch is arranged outside the refrigeration box 1 and is provided with a first gas shut-off valve 28, and the other branch extends into the refrigeration box 1 and is provided with a second gas shut-off valve 29. The gas composition analyzer 25 is provided with a gas suction pump 41 and a flow meter 42. Under the suction of the gas suction pump 41, the gas in the refrigeration box 1 enters the gas composition analyzer 25 for detection and then returns to the refrigeration box 1.

[0065] The branch interface of the gas pipeline 30 located inside the refrigeration box 1 is close to the evaporative fan 3, and the coordinates of the branch interface are The three branch interfaces of the gas extraction pipeline 31 located inside the refrigeration box 1 have coordinates respectively as The branch interface of the gas return pipeline 32 located inside the refrigeration box 1 has coordinates as

[0066] The inventor found that during the operation of the refrigeration device, wet air can frost on the inner container, drawer and evaporator. The wet air enters and exits the cabinet through the same channel, but the transfer direction of the wet air is opposite, and the resistance characteristics are also different, resulting in inconsistent permeation rates. In the prior art, the commonly used permeation amount test method is bidirectional average measurement, that is, during the operation of the refrigeration device, the trace gas is directly filled in the cabinet, and the concentration decay rate of the trace gas is used to fit the average permeation amount of the wet air entering and exiting, but this measurement method is difficult to measure the permeation amount of the wet air entering or exiting alone.

[0067] Referring to Figures 1-2 The method for measuring the wet air permeation of the cabinet of the refrigeration device using the system comprises the following steps:

[0068] S1, test the permeation amount generated by the positive pressure difference during the temperature rise process in the refrigeration cabinet 1, and communicate with the ambient air, test the background concentration c of the trace gas in the environment by the component analyzer 25 atm The concentration value reaches the target value c0, stop delivering the trace gas into the refrigeration cabinet 1, drive the refrigeration cabinet 1 into the gradual temperature rise mode, fit the wet air exchange rate of the temperature rise process and the temperature maintenance process by the straight line method, adjust the temperature rise rate and heating temperature of the refrigeration cabinet 1, and test the wet air exchange rate generated by the positive pressure difference under different temperature and humidity difference conditions.

[0069] Specifically, the following steps are included:

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

[0071] S12, open the cabinet door of the shielding cabinet 43, communicate with the ambient air, open the gas component analyzer 25 to test the background concentration c of the trace gas in the environment atm The concentration value reaches the target value c0, stop delivering the trace gas into the refrigeration cabinet 1, drive the refrigeration cabinet 1 into the gradual temperature rise mode, fit the wet air exchange rate of the temperature rise process and the temperature maintenance process by the straight line method, adjust the temperature rise rate and heating temperature of the refrigeration cabinet 1, and test the wet air exchange rate generated by the positive pressure difference under different temperature and humidity difference conditions.

[0072] S13, close the first gas stop valve 28 on the gas pipeline 30, open the second gas stop valve 29, open the gas pressure regulating valve 27, open the evaporative fan 3, the gas component analyzer 25 and the gas suction pump 41, observe the real-time concentration c of the trace gas of the gas component analyzer 25 changes curve, until the concentration value reaches the target value c0, close the second gas stop valve 29.

[0073] S14, start the transport pump 4 and the heater 7, the refrigeration cabinet 1 enters the gradual temperature rise mode, the working medium of the system pipeline is the refrigerant, 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 c gradually from the initial ambient temperature T eGradually heating to a preset heating temperature T h , and maintaining for a period of time Δt r .

[0074] S15, record the trace gas concentration c change curve of the temperature in the refrigeration box 1 from T e to T h and maintain for a period of time Δt r , the change curve of the pressure difference sensor 33, the environmental 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, and use the formula ln(c-c atm )=-I×t+ln(c0-c atm ) to linearly fit the wet air exchange rate I of the temperature rise process and the temperature maintenance process.

[0075] S16, repeat steps S11-S15, adjust the temperature rise 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 amount generated by the negative pressure difference in the refrigeration box 1 during the cooling process, and record the trace gas background concentration c atm , the change curve of the environmental 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 real-time concentration c change curve of the trace gas, drive the refrigeration box 1 into the step-by-step cooling mode, adjust the cooling rate and cooling temperature of the refrigeration box 1 by linearly fitting the wet air exchange rate of the cooling process and the temperature maintenance process, and test the wet air exchange rate generated by the negative pressure difference under different temperature and humidity difference conditions.

[0077] Specifically, the following steps are included:

[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 shield box 43 door, and do not communicate with the environment, open the gas component analyzer 25, record the trace gas background concentration c atm , the change curve of the environmental 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 real-time tracer gas 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 working medium of the system pipeline is the refrigerant, adjust the speed of the compressor 14 so that the temperature detected by the temperature control sensor 35 in the box is 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 .

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

[0083] 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 working conditions.

[0084] S3, test the permeation volume generated by the periodic positive and negative pressure differences in the intermittent refrigeration process in the refrigeration box 1, drive the refrigeration box 1 to enter the intermittent refrigeration mode after cooling, and conduct with the ambient air. The tracer gas background concentration c in the test environment is measured by the gas composition analyzer 25. atm The valve on the gas pipeline 30 is adjusted to observe the change curve of the real-time tracer gas concentration c. 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 linear method. The dehumidification capacity of the evaporator 2 is calculated. The temperature fluctuation amplitude and frequency of the refrigeration box 1 are adjusted to test the wet air exchange rate caused by positive and negative pressure differences under different temperature and humidity difference conditions.

[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 detected by the temperature control sensor 35 in the box is T c In [T low ,T up ] changes between.

[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, start the evaporating fan 3, start the gas composition analyzer 25 and the micro suction pump 41, observe the real-time tracer gas concentration c change curve of the gas composition analyzer 25, and close the second gas shut-off valve 29 when the concentration reaches the target value c0.

[0090] S35, record 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 ) The straight-line method is used to fit the two-way average exchange rate I of the 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. Repeat steps S31 to S35 to adjust the temperature fluctuation amplitude and frequency of the refrigeration box 1 by adjusting the preset temperature of the controller 22, and test 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 forward and reverse switching measurements of moist air can be performed to measure the permeability separately, thereby restoring the real moist air transmission path. The separate measurement of the permeability can more accurately obtain the specific value of moist air entering or exhausting. Direct measurement of moist air entering and exhausting can avoid errors caused by external factors or complex system interference. Especially when detailed quantitative analysis of subsequent permeability is required, separate measurement provides more direct and accurate data, and can also avoid the influence of mixing effects, making the measurement results more representative.

[0093] In addition, the steady state and dynamic switching of wet air permeation can be performed, and the steady state permeation amount and the average permeation amount in the dynamic state can be measured according to the requirements. In actual operation of the refrigeration box 1, the permeation amount of the wet air will change due to factors such as refrigeration device load, external temperature change, cooling load, etc. By switching between the steady state and dynamic state modes for measurement, the wet air permeation amount in different working states can be accurately mastered. The steady state permeation amount is suitable for stable conditions in long-term operation, and can reflect the permeation behavior of the refrigeration device under continuous load, helping to evaluate the long-term stability and efficiency of the refrigeration device. The dynamic permeation amount is suitable for conditions with large load fluctuations or changes in a short period of time, and can help analyze the response and adaptability of the refrigeration device under changing load conditions. Moreover, the steady state permeation measurement can provide a reference to help the design engineer evaluate the operating efficiency of the refrigeration device under normal load, and provide a basis for energy efficiency optimization in long-term operation. By understanding the average permeation amount in the 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 amounts at different refrigeration temperatures. In actual operation of the refrigeration box 1, changes in temperature often cause changes in the permeation amount of the wet air. By adjusting the refrigeration temperature during 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 device under various actual environmental conditions. Under steady state conditions, the temperature is relatively constant, and the long-term operating efficiency of the system at a certain fixed temperature can be evaluated. Under dynamic conditions, the process of temperature adjustment simulates load fluctuations, and the adaptability and response speed of the refrigeration device when responding to temperature changes can be analyzed.

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

[0096] Please refer to Figures 3-7 As shown in FIG. 1, the refrigeration device box wet air permeation measurement system in the present application is installed in a model BD-226WL air-cooled refrigerator box, 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). After the refrigerator is tested in a closed state with five different magnetic strip thickness door seals, the wet air permeation rate of the refrigerator is tested under the intermittent refrigeration positive and negative pressure difference, temperature rise positive pressure difference, and temperature drop negative pressure difference working conditions by switching the on-off switch of the execution structure and using tracer gas.

[0097] Please refer to Figures 8-9 As shown in FIG. 1, the experimental door seal with a magnetic strip thickness of m1 is taken as an example, Figure 8 In the 3-hour measurement process, the CO2 concentration decreased from about 980 ppm to about 830 ppm, and the wet air exchange rate fitted by the linear method was 0.1175 h-1 The wet air permeation rate is calculated to be 20.036 g.h -1 . Figure 9 It can be seen from the table that the temperature, relative humidity, pressure difference and power periodically change with the start-stop cycle of the compressor. The positive and negative pressure difference caused by the temperature change is the driving force for the wet air permeation.

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

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

[0100]

[0101] It can be seen from the above table that as the door seal magnetic strip thickness increases, the sealing force of the refrigerator door body increases, i.e. the sealing performance is improved. Under the intermittent refrigeration positive and negative pressure difference condition, the wet air permeation rate is 10.402 g.h -1 ~ 20.036 g.h -1 ; under the temperature rising positive pressure difference condition, the wet air permeation rate is 7.145 g.h -1 ~ 15.313 g.h -1 ; and under the temperature falling negative pressure difference condition, the wet air permeation rate is 13.829 g.h -1 ~ 25.578 g.h -1 . The wet air permeation rate generated by the temperature falling negative pressure difference is greater than that generated by the temperature rising positive pressure difference, so the wet air permeation rate under the intermittent refrigeration positive and negative pressure difference condition is between the two.

[0102] The above has described one embodiment of the present application in detail, but the content described is only the preferred embodiment of the present application, and cannot be considered to limit the implementation range of the present application. Any equivalent changes and improvements made according to the scope of the present application should still belong to the scope of the claims of the present application.

Claims

1. A refrigeration 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 induce the infiltration 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 tracing 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 brine flows back to the inlet of the evaporator (2) in the first branch 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 secondary 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 a return pipe (32); The collector (23) is connected to a pressure difference 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 provided on the main pipe of the gas pipeline (30) for regulating 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); the other branch extends into the refrigeration box (1) and is provided with a second gas stop 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 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 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. Test the permeation volume generated 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 change curve is adjusted, 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 working 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 tracer gas real-time concentration c, driving the refrigeration box (1) to enter the 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 working conditions; S3, testing the permeation volume generated by the periodic positive and negative pressure differences in the intermittent refrigeration process in the refrigeration box (1), driving the refrigeration box (1) to enter the intermittent refrigeration mode after cooling, and conducting 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 change curve of the tracer gas concentration c is observed until the concentration value reaches the target value c0. Then, 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, and 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 working 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 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; S13, closing the first gas shut-off valve (28) on the gas transmission pipeline (30), opening the second gas shut-off valve (29), opening the gas pressure regulating valve (27), turning on the evaporation fan (3), the gas composition analyzer (25) and the suction pump (41), observing the tracer gas real-time concentration c change curve of the gas composition analyzer (25), and closing the second gas shut-off valve (29) when the concentration value reaches the target value c0; S14, start the transport pump (4) and the heater (7), the refrigeration box (1) enters the gradual temperature increase 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 detected by the temperature control sensor (35) 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 ; S15, record the temperature inside the refrigeration box (1) from T e to T h And maintain for a duration of 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 ) Linear method fitting of 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 working 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 , a 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); 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, 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 working medium of the system pipeline is the refrigerant, adjust the speed of the compressor (14), and make the temperature detected by the temperature control sensor (35) in the box 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 duration of 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 fitting of 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 refrigeration 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 working 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. The temperature range is preset in the controller (22) so that the temperature detected by the temperature control sensor (35) in the box is T c In [T low ,T up ] changes between; 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; S34, close the first gas shut-off valve (28) on the gas transmission pipeline (30), open the second gas shut-off valve (29), open the gas pressure regulating valve (27), start the evaporation fan (3), start the gas composition analyzer (25) and the micro suction pump (41), observe the tracer gas real-time concentration c change curve of the gas composition analyzer (25), and close the second gas shut-off valve (29) when the concentration value reaches the target value c0; S35, record 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 ) fitting the average two-way exchange rate I of the wet air in the intermittent refrigeration process by the straight line method, 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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