CN114486104A

CN114486104A - System and method for detecting sealing performance of refrigerating device and storage medium

Info

Publication number: CN114486104A
Application number: CN202210093967.3A
Authority: CN
Inventors: 赵洋; 蔡宁; 曲宗峰; 杨双; 张子祺; 李欣; 亓新; 汪超; 马安娜
Original assignee: Cheari Beijing Certification & Testing Co ltd
Current assignee: Cheari Beijing Certification & Testing Co ltd
Priority date: 2022-01-26
Filing date: 2022-01-26
Publication date: 2022-05-13
Anticipated expiration: 2042-01-26
Also published as: CN114486104B

Abstract

The refrigeration device tightness detection system, method and storage medium of the present application may comprise: the pipeline system comprises a first pipeline, a second pipeline, a fourth pipeline, a fifth pipeline and a sixth pipeline. The first pipeline includes: the compressed helium storage tank, the fourth electromagnetic valve, the first pressurization air pump, the first constant pressure tank and the sixth electromagnetic valve are sequentially connected. The second pipeline includes: the compressed helium storage tank and the third electromagnetic valve are connected in sequence. The fourth pipeline includes: a first solenoid valve. The fifth pipeline includes: a first vacuum pump, an eighth electromagnetic valve, a ninth electromagnetic valve and a twelfth electromagnetic valve which are connected in sequence. The sixth pipeline includes: a pressure gauge and a seventh electromagnetic valve which are connected in sequence. The system, the method and the storage medium for detecting the sealing performance of the refrigerating device realize large leakage detection, air tightness detection after freezing condition simulation and air tightness detection after extreme temperature and pressure change simulation of a to-be-detected component of the refrigerating device.

Description

System and method for detecting sealing performance of refrigerating device and storage medium

Technical Field

The present disclosure relates to the field of tightness testing technologies, and in particular, to a system, a method, and a storage medium for detecting tightness of a refrigeration device.

Background

The sealing performance of the refrigerating device is one of important factors for ensuring safe and efficient operation of products such as a refrigerating device, an air conditioner, a heat pump and the like. In the aspect of safety, the risk of deflagration of the unit is greatly increased due to the leakage of flammable refrigerants, great personal and property safety hazards are caused, and the environment is damaged to a certain extent due to the leakage of non-flammable refrigerants; in terms of performance, the lack of refrigerant will cause the unit operating efficiency to be greatly reduced, and will damage each operating component of the system while causing energy waste. Generally, the parts of the refrigeration device which are easy to leak are the joints of parts such as valves, bent pipes and heat exchangers, the sealing performance of the parts is greatly influenced by the material and the connection mode of the parts, and the sealing performance of the parts which are permanently connected such as brazing and welding or non-permanently connected such as flaring needs to meet strict tests for sealing performance verification.

At present, the detection mode of the tightness of pipelines, valves and connecting pieces of the refrigerating device is mainly helium detection, namely, helium with certain pressure is directly introduced into the pipelines, valves and connecting pieces of the refrigerating device for leakage capture. However, this direct detection approach has two major drawbacks: firstly, large leakage detection is not usually set in the detection process, and if the leakage of the component is obvious, the requirement on the helium gas usage is high, the waste condition is obvious, and the cost is obviously increased; secondly, during detection, leakage detection is only carried out in an original state, and conditions possibly occurring in actual operation such as high and low temperature, high and low pressure, freezing and the like are not simulated, so that the detection method is not complete, and potential leakage risks can occur when the refrigerating device is put into use at a later stage.

Disclosure of Invention

The present application provides a refrigeration device hermeticity detection system, method, and storage medium that seeks to address or partially address at least one of the above-mentioned problems with the background art and other deficiencies in the art.

The present application provides such a refrigeration device leakproofness detecting system, can include: the pipeline system comprises a first pipeline, a second pipeline, a fourth pipeline, a fifth pipeline and a sixth pipeline. The first pipeline includes: the device comprises a compressed helium storage tank, a fourth electromagnetic valve, a first pressurization air pump, a first constant pressure tank and a sixth electromagnetic valve which are sequentially connected, wherein the sixth electromagnetic valve is further connected with a part to be tested of the refrigerating device, a first branch is arranged between the first pressurization air pump and the first constant pressure tank and comprises a fifth electromagnetic valve, and the fifth electromagnetic valve is communicated with the outside. The second pipeline includes: the device comprises a compressed helium storage tank and a third electromagnetic valve which are sequentially connected, wherein the third electromagnetic valve is also connected with a component to be tested. The fourth pipeline includes: and one side of the first electromagnetic valve is communicated to the outside, and the other side of the first electromagnetic valve is connected with the component to be tested. The fifth pipeline includes: the electromagnetic valve comprises a first vacuum pump, an eighth electromagnetic valve, a ninth electromagnetic valve and a twelfth electromagnetic valve which are sequentially connected, wherein one side of the first vacuum pump, which is far away from the eighth electromagnetic valve, is communicated to the outside, and the twelfth electromagnetic valve is also connected with a component to be tested; a second branch and a third branch are arranged between the eighth electromagnetic valve and the ninth electromagnetic valve, the second branch comprises a tenth electromagnetic valve, a helium leak detector and a second vacuum pump which are sequentially connected, and the second vacuum pump is communicated with the outdoor; the third branch comprises a third vacuum pump, a thirteenth electromagnetic valve and a closed test box which are sequentially connected, and a fourth branch comprising a fourteenth electromagnetic valve is arranged between the thirteenth electromagnetic valve and the closed test box and is communicated with the outdoor; a fifth branch is arranged between the ninth electromagnetic valve and the twelfth electromagnetic valve and comprises an eleventh electromagnetic valve, and the eleventh electromagnetic valve is communicated with the outdoor space. The sixth pipeline includes: the pressure gauge and the seventh electromagnetic valve are sequentially connected, wherein the seventh electromagnetic valve is also connected with the component to be tested. Wherein, the part to be measured is located the inside of airtight proof box.

In some embodiments, further comprising: a third original pipeline. The third original pipeline comprises: the compressed air storage tank and the second solenoid valve that connect gradually, wherein the second solenoid valve still is connected with the part that awaits measuring.

In some embodiments, further comprising: and a third improved pipeline. The third improvement comprises: the compressed air storage tank, the second electromagnetic valve, the second booster pump, the second constant pressure tank and the seventeenth electromagnetic valve are sequentially connected, wherein the seventeenth electromagnetic valve is further connected with a component to be tested. The third modified piping further comprises: and the sixth branch comprises a second constant pressure tank, an eighteenth electromagnetic valve, a third booster pump, a third constant pressure tank and a nineteenth electromagnetic valve which are sequentially connected, wherein the nineteenth electromagnetic valve is also connected with the component to be tested. The third improved pipeline also comprises a seventh branch, which is arranged between the compressed air storage tank and the second electromagnetic valve and comprises a fifteenth electromagnetic valve, a sixteenth electromagnetic valve and a twentieth electromagnetic valve which are sequentially connected, wherein the twentieth electromagnetic valve is also connected with the component to be tested; and a ninth branch is arranged between the sixteenth electromagnetic valve and the twentieth electromagnetic valve and is connected with the third pressurizing pump.

In some embodiments, further comprising: a fan coil is arranged inside the closed test box, and a compressor, a throttle valve, a heat exchanger and a four-way reversing valve are arranged outside the closed test box; the first interface of the four-way reversing valve is connected with the outlet of the compressor, the third interface of the four-way reversing valve is connected with the inlet of the compressor, the second interface of the four-way reversing valve is sequentially connected with the fan coil, the throttle valve and the inlet of the heat exchanger, and the fourth interface of the four-way reversing valve is connected with the outlet of the heat exchanger.

In some embodiments, a seventh conduit is also included. The seventh pipe includes: the twenty-first electromagnetic valve, the water tank, the water pump and the twenty-second electromagnetic valve are sequentially connected, wherein the twenty-first electromagnetic valve and the twenty-second electromagnetic valve are respectively connected with different interfaces of the closed test box.

The application also provides a method for realizing the tightness detection of the refrigerating device by applying the system, which comprises the following steps: and S100, carrying out vacuum pumping operation on the closed test box to enable the closed test box to have a vacuum test environment, wherein the to-be-tested part of the refrigerating device is positioned in the closed test box. And S101, filling the part to be tested with compressed air with second preset pressure, and maintaining for first preset time. S102, collecting pressure variation of the closed test chamber, and measuring helium concentration of the closed test chamber by using a helium leak detector when the pressure variation of the closed test chamber is smaller than a first preset pressure fluctuation value. S103, when the helium concentration of the closed test chamber is smaller than a first preset helium concentration value, filling the part to be tested with compressed helium with second preset pressure and maintaining for first preset time, filling the part to be tested with compressed helium with maximum preset pressure and maintaining for second preset time, and measuring the helium concentration of the closed test chamber by using a helium leak detector.

In some embodiments, after S103, further comprising: s104, when the helium concentration is smaller than a second preset helium concentration value, adjusting the environmental pressure of the closed test chamber to be normal pressure, vacuumizing the part to be tested to a fifth preset pressure value, and maintaining for a third preset time; and S105, collecting the pressure variation of the component to be detected, sequentially repeating the steps from S100 to S103 when the pressure variation of the component to be detected is smaller than a second preset pressure fluctuation value and the shape of the component to be detected is not damaged or deformed, measuring the helium concentration of the closed test box by using a helium leak detector, and outputting qualified results of vacuum airtight detection and helium airtight detection of the component to be detected when the helium concentration is smaller than a second preset helium concentration value.

In some embodiments, after S103, further comprising: s201, when the helium concentration is smaller than a second preset helium concentration value, adjusting the environmental pressure of the closed test chamber to be normal pressure, filling water into the closed test chamber to a preset liquid level, vacuumizing the closed test chamber to a first preset pressure, and adjusting the environmental pressure of the closed test chamber to be normal pressure after keeping a fourth preset time; s202, draining water in the sealed test box, starting a refrigeration facility to adjust the environment temperature of the sealed test box to a first preset temperature and keeping the environment temperature for a fifth preset time so as to freeze the water attached to the outer wall of the component to be tested; s203, filling normal-temperature water into the closed test box to a preset liquid level, and maintaining for a sixth preset time to melt the water frozen on the outer wall of the component to be tested; s204, repeating S202 and S203 in sequence for a preset number of times; and S205, sequentially repeating the steps from S100 to S103, measuring the helium concentration of the closed test box by using a helium leak detector, and outputting qualified results of the freezing detection and the helium airtightness detection of the component to be detected when the helium concentration is smaller than a second preset helium concentration value.

In some embodiments, after S103, further comprising: s301, when the helium concentration is smaller than a second preset helium concentration value, filling compressed air with the maximum preset pressure into the part to be tested, adjusting the environmental temperature of the closed test chamber to the maximum preset temperature through a heating facility, and maintaining for a seventh preset time; s302, reducing the internal pressure of the component to be tested to the minimum preset pressure under the condition of the maximum preset temperature, and maintaining the eighth preset time; s303, repeating S302 and S303 in sequence for a preset number of times; and S304, sequentially repeating the steps from S100 to S103, measuring the helium concentration of the closed test box by using a helium leak detector, and outputting qualified results of temperature and pressure alternation detection and helium gas tightness detection of the part to be detected when the helium concentration is less than a second preset helium concentration value.

The present application also proposes a computer-readable storage medium storing a computer program for executing the above-mentioned method for leak tightness detection of a refrigeration device.

The present application further proposes an electronic device comprising a processor, a memory for storing processor-executable instructions. The processor is used for reading the executable instructions from the memory and executing the instructions to realize the method for detecting the tightness of the refrigerating device.

According to the technical scheme of the embodiment, at least one of the following advantages can be obtained.

The system, the method and the storage medium for detecting the sealing performance of the refrigerating device realize large leakage detection, airtightness detection after freezing condition simulation and airtightness detection after extreme change of temperature and pressure simulation on a part to be detected of the refrigerating device, and have the following beneficial effects: the helium resource waste phenomenon under the condition of large leakage is avoided in the detection process, and the detection cost is saved; secondly, extreme conditions which may occur when the refrigerating device operates are simulated in the detection process, so that the air tightness detection has practical reference significance; in summary, compared with the prior art, the method has the advantages of economy, rigor and practicality, and is worthy of popularization and application in the field.

Drawings

Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, with reference to the accompanying drawings in which:

FIG. 1 is a schematic block diagram of a first embodiment of a refrigeration unit leak detection system according to an exemplary embodiment of the present application;

FIG. 2 is a schematic block diagram of a second embodiment of a refrigeration unit leak detection system according to an exemplary embodiment of the present application;

FIG. 3 is a schematic block diagram of a third embodiment of a refrigeration unit leak detection system according to an exemplary embodiment of the present application;

FIG. 4 is a control schematic of a refrigeration unit leak detection system according to an exemplary embodiment of the present application;

FIG. 5 is a method flow diagram of an alternate test of vacuum hermetic test and helium hermetic test of a method of leak testing a refrigeration unit according to an exemplary embodiment of the present application;

FIG. 6 is a method flow diagram of an alternate test of freeze detection and helium detection hermetic seal detection of a method of hermetic seal detection of a refrigeration device according to an exemplary embodiment of the present application; and

fig. 7 is a flowchart of a method of alternating temperature and pressure detection and helium detection hermetic seal detection testing of a method of hermetic seal detection of a refrigeration device according to an exemplary embodiment of the present application.

Detailed Description

For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the present application and does not limit the scope of the present application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.

In the drawings, the size, dimension, and shape of elements have been slightly adjusted for convenience of explanation. The figures are purely diagrammatic and not drawn to scale. As used herein, the terms "approximately", "about" and the like are used as table-approximating terms and not as table-degree terms, and are intended to account for inherent deviations in measured or calculated values that would be recognized by one of ordinary skill in the art. In addition, in the present application, the order in which the processes of the respective steps are described does not necessarily indicate an order in which the processes occur in actual operation, unless explicitly defined otherwise or can be inferred from the context.

It will be further understood that terms such as "comprising," "including," "having," "including," and/or "containing," when used in this specification, are open-ended and not closed-ended, and specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Furthermore, when a statement such as "at least one of" appears after a list of listed features, it modifies that entire list of features rather than just individual elements in the list. Furthermore, the use of "may" mean "one or more embodiments of the application" when describing embodiments of the application. Also, the term "exemplary" is intended to refer to examples or illustrations.

Unless otherwise defined, all terms (including engineering and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

In addition, the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

The present application provides such a refrigeration device leakproofness detecting system, can include: the pipeline system comprises a first pipeline, a second pipeline, a fourth pipeline, a fifth pipeline and a sixth pipeline. The first pipeline includes: the device comprises a compressed helium storage tank, a fourth electromagnetic valve, a first pressurization air pump, a first constant pressure tank and a sixth electromagnetic valve which are sequentially connected, wherein the sixth electromagnetic valve is further connected with a part to be tested of the refrigerating device, a first branch is arranged between the first pressurization air pump and the first constant pressure tank and comprises a fifth electromagnetic valve, and the fifth electromagnetic valve is communicated with the outside. The second pipeline includes: the device comprises a compressed helium storage tank and a third electromagnetic valve which are sequentially connected, wherein the third electromagnetic valve is also connected with a component to be tested. The fourth pipeline includes: and one side of the first electromagnetic valve is communicated to the outside, and the other side of the first electromagnetic valve is connected with the component to be tested. The fifth pipeline includes: the electromagnetic valve comprises a first vacuum pump, an eighth electromagnetic valve, a ninth electromagnetic valve and a twelfth electromagnetic valve which are sequentially connected, wherein one side of the first vacuum pump, which is far away from the eighth electromagnetic valve, is communicated to the outside, and the twelfth electromagnetic valve is also connected with a component to be tested; a second branch and a third branch are arranged between the eighth electromagnetic valve and the ninth electromagnetic valve, the second branch comprises a tenth electromagnetic valve, a helium leak detector and a second vacuum pump which are sequentially connected, and the second vacuum pump is communicated with the outdoor; the third branch comprises a third vacuum pump, a thirteenth electromagnetic valve and a closed test box which are sequentially connected, and a fourth branch comprising a fourteenth electromagnetic valve is arranged between the thirteenth electromagnetic valve and the closed test box and is communicated with the outdoor; and a fifth branch circuit is arranged between the ninth electromagnetic valve and the twelfth electromagnetic valve and comprises an eleventh electromagnetic valve, and the eleventh electromagnetic valve is communicated with the outdoor. The sixth pipeline includes: the pressure gauge and the seventh electromagnetic valve are sequentially connected, and the seventh electromagnetic valve is further connected with the component to be tested. And the part to be tested is positioned in the closed test box.

In some embodiments, the components to be tested of the present application include piping, valves, connections, and the like of a refrigeration device.

First embodiment

Fig. 1 is a schematic configuration diagram of a first example of a refrigeration device leak detection system according to an exemplary embodiment of the present application.

As shown in fig. 1, the present application provides a system for detecting the sealing performance of a refrigeration device, which includes a sealed test chamber 1, a component 2 to be tested, a first vacuum pump 301, a second vacuum pump 302, a third vacuum pump 303, first to fourteenth electromagnetic valves 401 to 414, a compressed air storage tank 5, a compressed helium tank 6, a first constant pressure tank 701, a first pressure pump 801, a helium leak detector 9, and a pressure gauge 10.

In some embodiments, a first embodiment of the present application includes a first pipeline, a second pipeline, a third original pipeline, a fourth pipeline, a fifth pipeline, and a sixth pipeline. Specifically, in the first pipeline, the outlet of the compressed helium storage tank 6 is connected to one side of the fourth electromagnetic valve 404, the other side of the fourth electromagnetic valve 404 is connected to the inlet of the first pressurization air pump 801, the outlet of the first pressurization air pump 801 is connected to the inlet of the first constant pressure tank 701, the outlet of the first constant pressure tank 701 is connected to one side of the sixth electromagnetic valve 406, and the other side of the sixth electromagnetic valve 406 is connected to the component 2 to be tested of the refrigeration device. Further, a first branch including the fifth solenoid valve 405 is provided between the first pressurization air pump 801 and the first constant pressure tank 701, that is, the first branch communicates with the outside through the fifth solenoid valve 405. In the second pipeline, the outlet of the compressed helium gas storage tank 6 is connected to one side of the third electromagnetic valve 403, and the other side of the third electromagnetic valve 403 is directly connected to the component 2 to be tested. In the third original pipeline, the outlet of the compressed air storage tank 5 is connected to one side of the second electromagnetic valve 402, and the other side of the second electromagnetic valve 402 is directly connected to the component 2 to be tested. In the fourth pipeline, one side of the first electromagnetic valve 401 is directly communicated with the outside, and the other side of the first electromagnetic valve 402 is directly connected with the component 2 to be tested. It should be noted that the first pipeline, the second pipeline, the third original pipeline, and the fourth pipeline are connected in parallel.

Further, in the fifth pipeline, an outlet of the first vacuum pump 301 communicates with the outside, an inlet of the first vacuum pump 301 is connected to one side of the eighth solenoid valve 408, the other side of the eighth solenoid valve 408 is connected to one side of the ninth solenoid valve 409, the other side of the ninth solenoid valve 409 is connected to one side of the twelfth solenoid valve 412, and the other side of the twelfth solenoid valve 412 is directly connected to the component 2 to be tested. A second branch and a third branch are arranged between the eighth solenoid valve 408 and the ninth solenoid valve 409. In the second branch, one side of the tenth solenoid valve 410 is connected to an outlet of the helium leak detector 9, an inlet of the helium leak detector 9 is connected to an inlet of the second vacuum pump 302, and an outlet of the second vacuum pump 302 is communicated to the outside of the room through a pipeline. In the third branch, the outlet of the third vacuum pump 303 is connected to one side of a thirteenth solenoid valve 413, and the other side of the thirteenth solenoid valve 413 is connected to the sealing test chamber 1. Further, a fourth branch in which one side of the fourteenth solenoid valve 414 directly communicates with the outside is provided between the thirteenth solenoid valve 413 and the airtight test chamber 1. A fifth branch in which one side of the eleventh solenoid valve 411 directly communicates with the outdoor is provided between the ninth solenoid valve 409 and the twelfth solenoid valve 412.

In some embodiments, in the sixth pipeline, one side of the pressure gauge 10 is connected to one side of the seventh electromagnetic valve 407, and the other side of the seventh electromagnetic valve 407 is directly connected to the component 2 to be measured. The part 2 to be tested is located inside the closed test chamber 1.

In some embodiments, the system of the first embodiment can perform a large leak test, a vacuum hermetic test, and a helium hermetic test, wherein the large leak test is operated by: the eighth solenoid valve 408, the thirteenth solenoid valve 413, the first vacuum pump 301 and the third vacuum pump 303 are first opened, and the remaining valves and devices are all closed. The inside of the sealed test chamber 1 is vacuumized by the first vacuum pump 301 and the third vacuum pump 303, so that the pressure inside the sealed test chamber 1 is smaller than a first preset pressure, then the eighth electromagnetic valve 408, the thirteenth electromagnetic valve 413, the first vacuum pump 301 and the third vacuum pump 303 are closed, the compressed air storage tank 5 and the second electromagnetic valve 402 are opened, compressed air is supplied to the inside of the component to be tested 2 through the pressure state of the compressed air storage tank 5, and the pressure inside the component to be tested 2 is larger than a second preset pressure. And after keeping the pressure in the sealed test box 1 for the first preset time, reading the pressure in the sealed test box 1 and judging whether the pressure change is smaller than a first preset pressure fluctuation value or not. When the pressure change is smaller than the first preset pressure fluctuation value, the large leakage detection of the component 2 to be detected is qualified, otherwise, the large leakage detection of the component is unqualified.

Further, generally, in order to save the usage amount of helium gas, helium testing hermetic seal testing can be performed after passing the large leak testing, wherein the helium testing hermetic seal testing is performed by: opening the eighth electromagnetic valve 408, the thirteenth electromagnetic valve 413, the first vacuum pump 301 and the third vacuum pump 303, closing the rest valves and devices, performing vacuum pumping operation in the sealed test box 1 through the first vacuum pump 301 and the third vacuum pump 303 to enable the pressure inside the sealed test box 1 to be smaller than a first preset pressure, then closing the thirteenth electromagnetic valve 413 and the third vacuum pump 303, opening the ninth electromagnetic valve 409 and the twelfth electromagnetic valve 412, keeping the opening state of the first vacuum pump 301, performing vacuum pumping operation on the component to be tested 2 to enable the pressure inside the component to be tested 2 to be smaller than a third preset pressure, and then closing the first vacuum pump 301, the eighth electromagnetic valve 408, the ninth electromagnetic valve 409 and the twelfth electromagnetic valve 412. And further opening a second vacuum pump 302, a third vacuum pump 303, a tenth electromagnetic valve 410 and a thirteenth electromagnetic valve 413, continuously vacuumizing the closed test box 1 through the second vacuum pump 302 and the third vacuum pump 303, and continuously evacuating gas in the closed test box 1 after passing through the helium leak detector 9 in the process, so that whether the local helium concentration at the test time is smaller than a first helium concentration preset value is detected through the helium leak detector 9. When the local helium concentration at the test moment is judged to be less than the first helium concentration preset value, the data of the helium leak detector 9 is cleared, then the compressed helium storage tank 6 and the third electromagnetic valve 403 are opened, the compressed helium is provided for the component 2 to be detected through the pressure of the compressed helium storage tank 6, the internal pressure of the component 2 to be detected is not lower than the second preset pressure, after the first preset time is kept, the third electromagnetic valve 403 is closed, the fourth electromagnetic valve 404, the first pressurization air pump 801 and the sixth electromagnetic valve 406 are opened, the helium in the compressed helium storage tank 6 is pressurized and enters the component 2 to be detected in the process, so that the pressure in the component 2 to be detected reaches the maximum preset pressure (usually, the nominal maximum operation pressure of the sample), the pressure value is kept for the second preset time through the first constant pressure tank 701, the second vacuum pump 302 and the third vacuum pump 303 continuously evacuate the closed test box 1 and the helium leak detector 9 detects the helium concentration in real time in the process, and judging whether the helium concentration value is smaller than a second helium concentration preset value, if so, judging that the helium detection airtightness detection is qualified. If not, all the equipment and valves are firstly closed, and then the first electromagnetic valve 401, the fifth electromagnetic valve 405 and the fourteenth electromagnetic valve 414 are opened to exhaust the gas in the component to be tested 2, the closed test box 1 and the first constant pressure tank 701.

Furthermore, the operation flow of the vacuum tightness detection is as follows: when the component 2 to be tested and the closed test chamber 1 are in a normal pressure state, the first vacuum pump 301, the eighth electromagnetic valve 408, the ninth electromagnetic valve 409 and the twelfth electromagnetic valve 412 are opened, the rest valves and equipment are closed, vacuumizing the component 2 to be tested to make the internal pressure of the component 2 to be tested less than the fifth preset pressure value, immediately closing the first vacuum pump 301, the eighth solenoid valve 408, the ninth solenoid valve 409 and the twelfth solenoid valve 412 for a third preset time, whether the pressure variation value is less than the second preset pressure fluctuation value is judged through the pressure gauge 10 and the first pressure sensor 1001, and whether the pipe fitting has a damaged or deformed shape, if the pressure variation value is smaller than the second preset pressure fluctuation value and the pipe fitting has no damaged or deformed shape, the vacuum tightness detection of the component 2 to be tested is qualified, otherwise, the vacuum tightness detection of the component 2 to be tested is unqualified, and after the test is finished, the eleventh electromagnetic valve 411 and the twelfth electromagnetic valve 412 are opened to recover the internal pressure of the component 2 to be tested to normal pressure.

Furthermore, the vacuum airtightness detection and the helium airtightness detection are both tests established after the large leakage detection is qualified, wherein the vacuum airtightness detection can be repeatedly carried out for multiple times, and the helium airtightness detection can be repeatedly carried out once after all detections are finished, so that the accuracy of detection result data is ensured.

Further, the seventh electromagnetic valve 407 may be opened during each of the above tests, so that the pressure inside the component 2 to be measured may be monitored using the pressure gauge 10.

Second embodiment

Fig. 2 is a schematic configuration diagram of a second example of a refrigeration unit leak detection system according to an exemplary embodiment of the present application.

As shown in fig. 2, the second embodiment is a third modified pipeline obtained by modifying the third original pipeline on the basis of the first embodiment, and a fan coil 13 is arranged inside the sealed test chamber 1, and a compressor 11 is arranged outside the sealed test chamber 1.

Specifically, in the third modified pipeline, the outlet of the compressed air storage tank 5 is connected to one side of the second electromagnetic valve 402, the other side of the second electromagnetic valve 402 is connected to the inlet of the second booster pump 802, the first outlet of the second booster pump 802 is connected to the inlet of the second constant pressure tank 702, the outlet of the second constant pressure tank 702 is connected to one side of a seventeenth electromagnetic valve 417, and the other side of the seventeenth electromagnetic valve 417 is connected to the component 2 to be measured.

Furthermore, a sixth branch is further included in the third modified pipeline, that is, the second outlet of the second constant pressure tank 702 is connected to the inlet of the eighteenth electromagnetic valve 418, the outlet of the eighteenth electromagnetic valve 418 is connected to the first inlet of the third pressure pump 803, the outlet of the third pressure pump 803 is connected to the inlet of the third constant pressure tank 703, the outlet of the third constant pressure tank 703 is connected to one side of a nineteenth electromagnetic valve 419, and the other side of the nineteenth electromagnetic valve 419 is directly connected to the component 2 to be tested.

Furthermore, a seventh branch is further included in the third modified pipeline, the seventh branch is disposed between the compressed air storage tank 5 and the second solenoid valve 402, one side of a fifteenth solenoid valve 415 is connected to one side of a sixteenth solenoid valve 416, the other side of the sixteenth solenoid valve 416 is connected to one side of a twentieth solenoid valve 420, and the other side of the twentieth solenoid valve 420 is directly connected to the component 2 to be tested. An eighth branch is arranged between the fifteenth electromagnetic valve 415 and the sixteenth electromagnetic valve 415 and is connected with the second pressurizing pump 802, and a ninth branch is arranged between the sixteenth electromagnetic valve 416 and the twentieth electromagnetic valve 420 and is connected with a second inlet of the third pressurizing pump 803.

In some embodiments, a fan coil 13 is disposed inside the sealed test chamber 1, and a compressor 11 is disposed outside the sealed test chamber 1. Specifically, the inlet of the fan coil 13 is connected with the outlet of the compressor 11, the inlet of the compressor 11 is connected with the outlet of the heat exchanger 12, the inlet of the heat exchanger 12 is connected with the outlet of the throttle valve 14, and the inlet of the throttle valve 14 is connected with the outlet of the fan coil 13, so that a heating cycle is formed for raising the temperature in the sealed test box 1.

The system of the second embodiment can realize a temperature and pressure alternation detection test, and in specific implementation, the compressed air storage tank 5, the second electromagnetic valve 402, the sixteenth electromagnetic valve 416, the nineteenth electromagnetic valve 419, the second pressurization air pump 802 and the third pressurization air pump 803 are opened, the rest devices and valves are closed, the compressed air enters the third constant pressure tank 703 after being pressurized to the maximum preset pressure by the second pressurization air pump 802 and the third pressurization air pump 803, and the maximum preset pressure is supplied to the component 2 to be tested from the third constant pressure tank 703 and the seventh preset time is kept. Meanwhile, the compressor 11 and the fan coil 13 are opened, the temperature in the sealed test box 1 is raised through a heating cycle, and the opening degree of the throttle valve 14 is adjusted to enable the temperature in the sealed test box 1 to reach the maximum preset temperature and keep the same for the seventh preset time.

Further, the maximum preset temperature in the closed test chamber 1 is maintained unchanged, the compressed air storage tank 5, the second electromagnetic valve 402, the sixteenth electromagnetic valve 416, the nineteenth electromagnetic valve 419, the second pressurization air pump 802 and the third pressurization air pump 803 are closed, the twelfth electromagnetic valve 412 and the eleventh electromagnetic valve 411 are opened to recover the pressure in the component 2 to be tested to the normal pressure, then the eleventh electromagnetic valve 411 is closed, the ninth electromagnetic valve 409, the eighth electromagnetic valve 408 and the first vacuum pump 301 are opened, and the component 2 to be tested is subjected to a vacuum pumping operation through the first vacuum pump 301, so that the internal pressure of the component 2 to be tested is reduced to the minimum preset pressure and is maintained for an eighth preset time.

Further, the ninth electromagnetic valve 409, the eighth electromagnetic valve 408 and the first vacuum pump 301 are closed, the twelfth electromagnetic valve 412 and the eleventh electromagnetic valve 411 are opened to recover the pressure in the component 2 to be tested to the normal pressure, and the operation of applying the maximum preset pressure and vacuumizing the component 2 to be tested to the minimum preset pressure is repeated for 50 times to complete the temperature and pressure alternation detection test.

With continued reference to fig. 2, when it is required to provide a non-maximum preset pressure test for the component 2 to be tested, in a first aspect, the compressed air storage tank 5, the second solenoid valve 402, the seventeenth solenoid valve 417 and the second pressurization air pump 802 may be opened to provide the component 2 to be tested with a pressure from the normal pressure to the maximum pressurization value of the second pressurization air pump 802 through the second constant pressure tank 702; in the second aspect, the compressed air storage tank 5, the second electromagnetic valve 402, the eighteenth electromagnetic valve 418, the nineteenth electromagnetic valve 419, the second pressurization air pump 802, and the third pressurization air pump 803 may be opened to provide the component 2 to be tested with a pressure between the maximum pressurization value of the second pressurization air pump 802 and the maximum preset pressure through the second constant pressure tank 702 and the third constant pressure tank 703.

Further, when the large leak detection is performed by the second embodiment, unlike the first embodiment, the compressed air storage tank 5, the fifteenth electromagnetic valve 415, the sixteenth electromagnetic valve 416, and the twentieth electromagnetic valve 420 need to be opened to supply the compressed air to the inside of the component 2 to be tested by the pressure state of the compressed air storage tank 5 itself and make the pressure inside the component 2 to be tested greater than the second preset pressure.

Further, the operation method for performing the vacuum airtightness test and the helium airtightness test according to the second embodiment is the same as that of the first embodiment.

Further, the temperature and pressure alternation testing of the second embodiment is a running simulation test, which is a precondition of the helium detection airtight testing in the actual operation process, that is, the testing sequence is usually: helium detection airtightness detection, temperature and pressure alternation detection and helium detection airtightness detection.

Third embodiment

Fig. 3 is a schematic configuration diagram of a third example of a refrigeration unit leak detection system according to an exemplary embodiment of the present application.

As shown in fig. 3, the third embodiment is added with a four-way selector valve 17 in addition to the second embodiment. The four-way reversing valve 17 enables the circulation to have the functions of refrigeration and heating at the same time, and is used for adjusting the internal temperature of the closed test box 1 more comprehensively. Specifically, the outlet of the compressor 11 is connected with the first interface of the four-way reversing valve 17 through a pipeline, the second interface of the four-way reversing valve 17 is connected with the inlet of the fan coil 13, the outlet of the fan coil 13 is sequentially connected with the throttle valve 14 and the inlet of the heat exchanger 12, the outlet of the heat exchanger 12 is connected with the fourth interface of the four-way reversing valve 17, and the third interface of the four-way reversing valve 17 is connected with the inlet of the compressor 11. When the first interface and the second interface of the four-way reversing valve 17 are communicated, and the third interface and the fourth interface are communicated, the system is in a heat supply cycle; when the first interface and the fourth interface of the four-way reversing valve 17 are communicated, and the second interface and the third interface are communicated, the system is in a refrigeration cycle.

Further, a seventh pipeline is further provided in this embodiment. The seventh pipeline is arranged at the bottom of the airtight test box 1 and is communicated with one side of the twenty-first electromagnetic valve 421, the other side of the twenty-first electromagnetic valve 421 is communicated with the inside of the water tank 16 through a pipeline, the bottom of the water tank 16 is provided with a pipeline connected with an inlet of the water pump 15, an outlet of the water pump 15 is communicated with one side of the twenty-second electromagnetic valve 422, and the other side of the twenty-second electromagnetic valve 422 is communicated with the inside of the airtight test box 1 through a pipeline.

Further, the system according to the third embodiment can realize the temperature and pressure alternation detection test and the freezing detection test in different forms from those of the second embodiment. Specifically, the specific operation modes of different forms of temperature and pressure alternation detection tests are changed as follows: when the internal pressure of the part to be tested 2 is reduced to the minimum preset pressure through the vacuum pump, the maximum preset temperature in the closed test box 1 is not maintained continuously, but the direction of the passage is switched through the four-way reversing valve 17, so that the first interface and the fourth interface of the four-way reversing valve 17 are communicated, the second interface and the third interface are communicated, the circulation is changed into refrigeration circulation, and the temperature in the closed test box 1 is reduced to the minimum preset temperature through the fan coil 13. The above operation differs from the second embodiment in that: the second embodiment only has pressure alternation in a high-temperature state, while the third embodiment performs temperature alternation while performing pressure alternation, namely, high temperature corresponds to high pressure and low temperature corresponds to low pressure, and the change makes the test more rigorous and the examination of the component 2 to be tested more comprehensive.

Further, the specific operation mode of the freezing detection test is as follows: when the closed test box 1 is in a normal pressure state, firstly opening the twenty-second electromagnetic valve 422 and the water pump 15, filling water in the water tank 16 into the closed test box through the water pump 15, and enabling the liquid level to be higher than a preset water level (submerging the part to be measured 2); after the twenty-second electromagnetic valve 422 and the water pump 15 are closed, the thirteenth electromagnetic valve 413, the eighth electromagnetic valve 408, the first vacuum pump 301 and the third vacuum pump 303 are opened, the pressure in the sealed test chamber 1 is reduced to the first preset pressure through the action of the vacuum pump, after the fourth preset time is maintained, the thirteenth electromagnetic valve 413, the eighth electromagnetic valve 408, the first vacuum pump 301 and the third vacuum pump 303 are closed, and the fourteenth electromagnetic valve 414 is opened to restore the pressure in the sealed test chamber 1 to the normal pressure.

Further, the twenty-first electromagnetic valve 421 is opened to discharge all water in the sealed test chamber 1 into the water tank 16, then the twenty-first electromagnetic valve 421 is closed, the compressor 11 and the fan coil 13 are opened, the first interface and the fourth interface of the four-way reversing valve 17 are communicated, the second interface and the third interface are communicated, the temperature inside the sealed test chamber 1 is cooled to the first preset temperature and kept for the fifth preset time through refrigeration cycle and adjustment of the opening of the throttle valve 14, and the refrigeration cycle is closed after the participating moisture attached to the outer wall of the component to be tested is fully frozen.

Further, the twenty-second electromagnetic valve 422 and the water pump 15 are opened again, so that the water in the water tank 16 enters the closed test chamber 1 to reach the preset liquid level for a sixth preset time, so that the water frozen on the component 2 to be tested is sufficiently melted, and then the water pump 15 and the twenty-second electromagnetic valve 422 are closed.

Further, the freezing detection is completed after the processes of draining, freezing, filling water and melting are repeated for 30 times.

Further, the operation method for performing the vacuum airtight inspection, the helium airtight inspection, and the large leak inspection according to the third embodiment is the same as that of the third embodiment.

Further, the freeze detection test according to the third embodiment is a running simulation test, and is a precondition of the helium detection airtight detection test in the actual operation process, that is, the test sequence is generally: helium detection airtightness detection-freezing detection-helium detection airtightness detection.

Fig. 4 is a control schematic diagram of a refrigeration unit leak detection system according to an exemplary embodiment of the present application.

As shown in fig. 4, the arrangement and connection of the electronic control system are as follows: the electronic computer 18 is connected to the PLC controller 19, and the PLC controller 19 has digital signal input terminals connected to a first pressure sensor 1001, a second pressure sensor 1002, a third pressure sensor 1003, a fourth pressure sensor 1004, a temperature sensor 2001, and a liquid level sensor 3001, respectively. The digital signal output end of the PLC 19 is respectively connected with a first 401 to a twenty-second electromagnetic valve 422, a first pressurized air pump 801, a second pressurized air pump 802, a third pressurized air pump 803, a first vacuum pump 301, a second vacuum pump 302, a third vacuum pump 303, a water pump 15, a compressor 11, a fan coil 13 and a four-way reversing valve 17.

Further, the basic principle of the electric control system is as follows: the electronic computer 18 collects data of various sensors through the PLC 19 and is used for outputting detection reports and original data; the PLC 19 drives the electromagnetic valve, the pressurization air pump, the vacuum pump, the water pump and the compressor to act by collecting digital signals of various sensors, so that automatic operation of large leakage detection, vacuum airtightness detection, helium airtightness detection, temperature and pressure alternation detection and freezing detection is realized. The alternate operation and the automatic judgment of various detection operations can be realized through the setting of different programs.

Further, the first pressure sensor 1001 is disposed at the pressure gauge 10, and is mainly used for detecting the pressure inside the component 2 to be tested in each test process, so as to determine the pressure state of the component 2 to be tested during the vacuum pumping operation, the pressure applying operation, and the pressure alternating operation, thereby implementing the operation of driving the executing component in each embodiment. The second pressure sensor 1002 is disposed inside the first constant pressure tank 701, and is configured to detect a state where pressure is provided to the component to be tested 2 by the first pipeline during the helium detection airtightness detection, so as to drive various electromagnetic valves and the first pressurization air pump 801 to operate. The third pressure sensor 1003 is disposed inside the second constant pressure tank 702, and is configured to detect a state where intermediate pressure is provided to the component 2 to be tested by the third pipeline during temperature and pressure alternation detection, so as to drive various electromagnetic valves, the second pressurizing air pump 802, and the third pressurizing air pump 803 to operate. The fourth pressure sensor 1004 is disposed inside the third constant pressure tank 703, and is configured to detect a state where the third pipeline provides the maximum pressure to the component 2 to be tested during the temperature and pressure alternation detection, so as to drive various electromagnetic valves, the second pressurizing air pump 802, and the third pressurizing air pump 803 to operate. The fifth pressure sensor 1005 is disposed inside the sealed test chamber 1, and is configured to detect a pressure state inside the sealed test chamber 1 in each test process, so as to drive the execution components in each embodiment to operate. The temperature sensor 2001 is disposed inside the sealed test box 1, and is configured to detect the temperature inside the sealed test box 1 during temperature and pressure alternation detection and freezing detection, so as to drive the compressor 11, the fan coil 13, the four-way reversing valve 17, the throttle valve 14, and other components during the refrigeration and heating cycle. The liquid level sensor 3001 is arranged inside the sealed test box 1 and used for detecting the liquid level condition inside the sealed test box 1 during freezing detection, so that the water pump 15, the twenty-second electromagnetic valve 422, the twenty-first electromagnetic valve 421 and other components are driven to act.

On the other hand, the invention also provides a method for detecting the tightness of the refrigerating device, which comprises four parts of helium detection airtightness detection, vacuum airtightness detection, temperature and pressure alternation detection and freezing detection, wherein the vacuum airtightness detection, the temperature and pressure alternation detection and the freezing detection need to be respectively matched with the helium detection airtightness detection.

Fig. 5 is a method flowchart of an alternating test of vacuum hermetic detection and helium hermetic detection of a method of leak testing of a refrigeration device according to an exemplary embodiment of the present application.

As shown in fig. 5, the method for testing the alternation of the vacuum airtight test and the helium test airtight test comprises the following steps: and S100, carrying out vacuum pumping operation on the closed test box to enable the closed test box to have a vacuum test environment, wherein the to-be-tested part of the refrigerating device is positioned in the closed test box. And step S101, filling the part to be tested with compressed air with second preset pressure, and maintaining for first preset time. And S102, collecting the pressure variation of the closed test chamber, and measuring the helium concentration of the closed test chamber by using a helium leak detector when the pressure variation of the closed test chamber is smaller than a first preset pressure fluctuation value. Step S103, when the helium concentration of the closed test chamber is smaller than a first preset helium concentration value, filling compressed helium with a second preset pressure into the part to be tested and maintaining the first preset time, filling compressed helium with the maximum preset pressure into the part to be tested and maintaining the second preset time, and measuring the helium concentration of the closed test chamber by using a helium leak detector. Step S104, when the helium concentration is smaller than a second preset helium concentration value, adjusting the environmental pressure of the closed test chamber to be normal pressure, vacuumizing the part to be tested to a fifth preset pressure value, and maintaining the third preset time; and step S105, collecting the pressure variation of the component to be detected, when the pressure variation of the component to be detected is smaller than a second preset pressure fluctuation value and the shape of the component to be detected is not damaged or deformed, sequentially repeating the steps from step S100 to step S103, measuring the helium concentration of the closed test box by using a helium leak detector, and outputting qualified results of vacuum airtight detection and helium airtight detection of the component to be detected when the helium concentration is smaller than a second preset helium concentration value.

Specifically, test environment (be airtight proof box) evacuation for the inside pressure of test environment is less than first preset pressure, lets in compressed air to the part that awaits measuring afterwards, and the in-process need not carry out extra pressure boost to compressed air, makes the part internal pressure that awaits measuring be greater than the second and predetermines pressure, reads test environment internal pressure after keeping first preset time, judges whether the pressure value is less than first preset pressure fluctuation value. And if the internal pressure value of the test environment is judged to be larger than or equal to the first preset pressure fluctuation value, judging that the vacuum airtightness test and the helium detection airtightness test of the part to be tested are not qualified, and ending the test. And if the internal pressure value of the test environment is judged to be smaller than the first preset pressure fluctuation value, judging that the large leakage detection of the part to be detected in the initial stage is qualified, and continuing to perform the subsequent steps.

And continuing to carry out vacuumizing operation on the test environment, so that the pressure inside the test environment is smaller than a first preset pressure, vacuumizing the part to be tested at the same time, so that the pressure value inside the part to be tested is smaller than a third preset pressure, switching the helium leak detector into the test environment, reading the data of the helium leak detector, judging whether the data is smaller than a first helium concentration preset value, and judging whether the local helium concentration index at the test moment can carry out helium detection test. And if the data read by the helium leak detector is greater than or equal to the first helium concentration preset value, judging that the local helium concentration exceeds the standard at the moment, and ending the test. And if the data read by the helium leak detector is smaller than the first helium concentration preset value, judging that the local helium concentration at the moment reaches the standard, and continuing to perform the subsequent steps.

The method comprises the steps of keeping a vacuum state in a test environment, resetting a helium leak detector, filling helium into a part to be tested, firstly, additionally pressurizing gas to enable the pressure inside the part to be tested to reach a second preset pressure, keeping the first preset time, then, introducing the helium into the part to be tested after pressurization to enable the internal pressure of the part to be tested to be kept in a state larger than the maximum preset pressure (generally, the nominal maximum running pressure of a sample) and keeping the internal pressure of the part to be tested for the second preset time. In the process, the helium concentration is detected by the helium leak detector in real time, and whether the helium concentration value is smaller than a second helium concentration preset value is judged. And if the helium concentration value detected by the helium leak detector is greater than or equal to the second helium concentration preset value, judging that the helium detection airtightness detection of the part to be detected is unqualified, and ending the test. And if the helium concentration value detected by the helium leak detector is smaller than the second helium concentration preset value, judging that the helium detection airtightness detection of the part to be detected is qualified in the initial stage, and continuing to perform the subsequent steps.

And recovering the test environment and the internal pressure of the part to be detected to a normal pressure state, further performing vacuumizing operation on the part to be detected to ensure that the internal pressure of the part to be detected is less than a fifth preset pressure value and maintain a third preset time, judging whether the internal pressure of the sample is increased to be less than a second preset pressure fluctuation value or not through the reading of a pressure gauge and a pressure sensor, and simultaneously performing visual inspection on the part to be detected to judge whether the appearance of the part to be detected is not damaged or deformed. And if the pressure rise in the part to be tested is greater than or equal to the second preset pressure fluctuation value or the appearance of the part to be tested is damaged or deformed, judging that the vacuum airtightness detection of the sample is unqualified, and ending the test. And if the pressure rise in the part to be detected is smaller than the second preset pressure fluctuation value and the appearance of the part to be detected is not damaged or deformed, judging that the vacuum airtightness detection of the sample is qualified, and continuing to perform the subsequent steps.

And repeating all the steps (step S100 to step S103) once, and judging whether the reading is smaller than a second helium concentration preset value through the helium leak detector again. And if the reading of the helium leak detector is greater than or equal to the second helium concentration preset value, judging that the helium detection airtightness detection of the part to be detected is unqualified, and ending the test. And if the reading of the helium leak detector is smaller than the second helium concentration preset value, judging that the part to be tested is qualified in vacuum airtightness detection and helium airtightness detection, and finishing the test if the part to be tested passes the test.

Fig. 6 is a method flow diagram of an alternate test of freeze detection and helium detection hermetic seal detection of a method of hermetic seal detection of a refrigeration device according to an exemplary embodiment of the present application.

As shown in fig. 6, the method of the alternate test of freezing detection and helium detection airtightness comprises: and S100, carrying out vacuum pumping operation on the closed test box to enable the closed test box to have a vacuum test environment, wherein the to-be-tested part of the refrigerating device is positioned in the closed test box. And step S101, filling the part to be tested with compressed air with second preset pressure, and maintaining for first preset time. And S102, collecting the pressure variation of the closed test chamber, and measuring the helium concentration of the closed test chamber by using a helium leak detector when the pressure variation of the closed test chamber is smaller than a first preset pressure fluctuation value. Step S103, when the helium concentration of the closed test chamber is smaller than a first preset helium concentration value, filling compressed helium with a second preset pressure into the part to be tested and maintaining the first preset time, filling compressed helium with the maximum preset pressure into the part to be tested and maintaining the second preset time, and measuring the helium concentration of the closed test chamber by using a helium leak detector. Step S201, when the helium concentration is smaller than a second preset helium concentration value, adjusting the environmental pressure of the sealed test chamber to be normal pressure, filling water into the sealed test chamber to a preset liquid level, vacuumizing the sealed test chamber to a first preset pressure, and adjusting the environmental pressure of the sealed test chamber to be normal pressure after keeping a fourth preset time. Step S202, the water in the sealed test box is drained, a refrigeration facility is started to adjust the environment temperature of the sealed test box to the first preset temperature and keep the environment temperature for the fifth preset time, so that the water attached to the outer wall of the component to be tested is frozen. And step S203, filling normal-temperature water into the sealed test box to a preset liquid level, and maintaining for a sixth preset time to melt the water frozen on the outer wall of the component to be tested. Step S204, repeating step S202 and step S203 in sequence for a preset number of times. And S205, sequentially repeating the steps from S100 to S103, measuring the helium concentration of the closed test box by using a helium leak detector, and outputting qualified results of the freezing detection and the helium airtightness detection of the component to be detected when the helium concentration is smaller than a second preset helium concentration value.

Specifically, the steps S100 to S103 can refer to the foregoing, and are not described herein again. After the steps S100 to S103, whether the reading is smaller than a second helium concentration preset value is determined by the helium leak detector, and the process is used for determining the initial air tightness of the component to be tested. And if the initial air tightness of the part to be tested is unqualified, ending the test. And if the initial air tightness of the part to be tested is qualified, continuing to perform the subsequent steps.

Restoring the pressure in the test environment and the sample to normal pressure, filling normal-temperature water into the test environment until the liquid level in the test environment reaches a preset liquid level height (the sample needs to be immersed), vacuumizing the test environment and enabling the internal pressure of the test environment to be smaller than a first preset pressure, restoring the pressure in the test environment to normal pressure after keeping the fourth preset time, and further performing subsequent steps.

And (3) evacuating normal-temperature water in the test environment, starting a fan coil part of a refrigeration facility to reduce the temperature in the test environment to a first preset temperature and keeping the temperature for a fifth preset time, wherein the participation moisture attached to the outer wall of the part to be tested is required to be fully frozen in the process, and then, carrying out subsequent steps.

And further adding normal-temperature water into the test environment, enabling the water level to reach a preset liquid level height, maintaining the sixth preset time, fully melting the water frozen on the outer wall of the component to be tested, and then performing subsequent steps.

The subsequent steps are performed after repeating S202 and steps S203 to 30 times.

And repeating the steps S100 to S103 once, and judging whether the reading is smaller than a second helium concentration preset value through the helium leak detector again. And if the reading of the helium leak detector is greater than or equal to the second helium concentration preset value, judging that the component to be detected is not qualified in freezing detection and helium detection airtightness detection, and ending the test. And if the reading of the helium leak detector is smaller than the second helium concentration preset value, judging that the part to be tested is frozen and detected, and the helium detection airtightness is qualified, and finishing the test if the part to be tested passes the test.

As shown in fig. 7, the method for testing the alternation of temperature and pressure detection and helium detection airtight detection comprises the following steps: and S100, carrying out vacuum pumping operation on the closed test box to enable the closed test box to have a vacuum test environment, wherein the to-be-tested part of the refrigerating device is positioned in the closed test box. And step S101, filling the part to be tested with compressed air with second preset pressure, and maintaining for first preset time. And S102, collecting the pressure variation of the closed test chamber, and measuring the helium concentration of the closed test chamber by using a helium leak detector when the pressure variation of the closed test chamber is smaller than a first preset pressure fluctuation value. Step S103, when the helium concentration of the closed test chamber is smaller than a first preset helium concentration value, filling compressed helium with a second preset pressure into the part to be tested and maintaining the first preset time, filling compressed helium with the maximum preset pressure into the part to be tested and maintaining the second preset time, and measuring the helium concentration of the closed test chamber by using a helium leak detector. Step S301, when the helium concentration is smaller than a second preset helium concentration value, filling compressed air with the maximum preset pressure into the part to be tested, adjusting the environmental temperature of the sealed test chamber to the maximum preset temperature through a heating facility, and maintaining the temperature for a seventh preset time; step S302, under the condition of the maximum preset temperature, reducing the internal pressure of the to-be-tested component to the minimum preset pressure, and maintaining for an eighth preset time. Step S303, repeat step S302 and step S303 in sequence to a preset number of times. And S304, sequentially repeating the steps from the step S100 to the step S103, measuring the helium concentration of the closed test box by using a helium leak detector, and outputting qualified results of temperature and pressure alternation detection and helium gas tightness detection of the part to be detected when the helium concentration is less than a second preset helium concentration value.

Specifically, the steps S100 to S103 can refer to the foregoing, and are not described herein again. And judging whether the reading is smaller than a second helium concentration preset value through a helium leak detector, wherein the process is used for judging the initial air tightness of the part to be detected. And if the initial air tightness of the part to be tested is unqualified, ending the test. And if the initial air tightness of the part to be tested is qualified, continuing the subsequent steps.

Introducing compressed air into the component to be tested, wherein the compressed air is required to be introduced and pressurized in the process so as to enable the pressure inside the component to be tested to reach the maximum preset pressure, meanwhile, the external working environment (namely the test environment) of the component to be tested reaches the maximum preset temperature through a heating facility (namely heat pump circulation with a fan coil), and the subsequent steps are carried out after the seventh preset time is maintained in the state.

And maintaining the maximum preset temperature of the external working environment unchanged, reducing the internal pressure of the part to be tested to the minimum preset pressure through the vacuum pump, and performing subsequent steps after maintaining the eighth preset time. Of course, the external working environment may be reduced to the minimum preset temperature by the refrigeration facility, so as to achieve the test state of minimizing the internal pressure of the component to be tested and minimizing the ambient temperature, and the subsequent steps are performed after the eighth preset time is maintained.

The subsequent steps are performed after repeating steps S302 and S303 fifty times.

And repeating the steps S101-S103 once, and judging whether the reading is smaller than a second helium concentration preset value through the helium leak detector again. And if the reading of the helium leak detector is greater than or equal to the second helium concentration preset value, judging that the temperature and pressure alternation detection and the helium detection airtightness detection of the part to be detected are unqualified, and ending the test. And if the reading of the helium leak detector is smaller than the second helium concentration preset value, judging that the temperature and pressure alternation detection and the helium detection airtightness detection of the part to be tested are qualified, and finishing the test if the part to be tested passes the test.

Further, the control method described in the present application is stored in a computer readable storage medium, and the above detection method is implemented by a controller.

The above description is only for the specific embodiments of the present application, but the scope of the present application is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present application should be covered within the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A refrigeration device seal detection system, comprising:

a first conduit comprising: the device comprises a compressed helium storage tank, a fourth electromagnetic valve, a first pressurization air pump, a first constant pressure tank and a sixth electromagnetic valve which are sequentially connected, wherein the sixth electromagnetic valve is also connected with a component to be tested of a refrigerating device, a first branch circuit comprising a fifth electromagnetic valve is arranged between the first pressurization air pump and the first constant pressure tank, and the fifth electromagnetic valve is communicated with the outside;

a second conduit comprising: the compressed helium storage tank and the third electromagnetic valve are sequentially connected, wherein the third electromagnetic valve is also connected with the component to be tested;

a fourth conduit comprising: the first electromagnetic valve is communicated with the outside of the room at one side, and the other side of the first electromagnetic valve is connected with the component to be tested;

a fifth conduit comprising: the electromagnetic valve comprises a first vacuum pump, an eighth electromagnetic valve, a ninth electromagnetic valve and a twelfth electromagnetic valve which are sequentially connected, wherein one side of the first vacuum pump, which is far away from the eighth electromagnetic valve, is communicated to the outside, and the twelfth electromagnetic valve is also connected with the component to be tested; a second branch and a third branch are arranged between the eighth electromagnetic valve and the ninth electromagnetic valve, the second branch comprises a tenth electromagnetic valve, a helium leak detector and a second vacuum pump which are sequentially connected, and the second vacuum pump is communicated with the outdoor; the third branch comprises a third vacuum pump, a thirteenth electromagnetic valve and a closed test box which are sequentially connected, a fourth branch comprising a fourteenth electromagnetic valve is arranged between the thirteenth electromagnetic valve and the closed test box, and the fourteenth electromagnetic valve is communicated with the outdoor; a fifth branch is arranged between the ninth electromagnetic valve and the twelfth electromagnetic valve and comprises an eleventh electromagnetic valve, and the eleventh electromagnetic valve is communicated with the outdoor; and

a sixth conduit comprising: the pressure gauge and the seventh electromagnetic valve are sequentially connected, wherein the seventh electromagnetic valve is also connected with the component to be tested;

wherein, the part to be measured is located in the airtight test chamber.

2. A refrigeration device seal detection system as recited in claim 1 further comprising:

a third original pipeline comprising: compressed air storage jar and the second solenoid valve that connects gradually, wherein the second solenoid valve still with the part to be measured is connected.

3. A refrigeration device seal detection system as recited in claim 1 further comprising:

a third improvement comprising: the compressed air storage tank, the second electromagnetic valve, the second booster pump, the second constant pressure tank and the seventeenth electromagnetic valve are sequentially connected, wherein the seventeenth electromagnetic valve is also connected with the component to be tested;

the third modified piping further comprises: the sixth branch comprises a second constant pressure tank, an eighteenth electromagnetic valve, a third booster pump, a third constant pressure tank and a nineteenth electromagnetic valve which are sequentially connected, wherein the nineteenth electromagnetic valve is also connected with the component to be tested; and

the third modified piping further comprises: the seventh branch circuit is arranged between the compressed air storage tank and the second electromagnetic valve and comprises a fifteenth electromagnetic valve, a sixteenth electromagnetic valve and a twentieth electromagnetic valve which are sequentially connected, wherein the twentieth electromagnetic valve is also connected with the component to be tested; an eighth branch is arranged between the fifteenth electromagnetic valve and the sixteenth electromagnetic valve and connected with the second pressurizing pump, and a ninth branch is arranged between the sixteenth electromagnetic valve and the twentieth electromagnetic valve and connected with the third pressurizing pump.

4. A refrigeration device seal detection system as recited in claim 2 or 3 further comprising:

a fan coil is arranged inside the closed test box, and a compressor, a throttle valve, a heat exchanger and a four-way reversing valve are arranged outside the closed test box; the four-way reversing valve comprises a fan coil, a throttling valve, a heat exchanger, a four-way reversing valve, a fan coil, a throttle valve, a heat exchanger and a heat exchanger, wherein a first interface of the four-way reversing valve is connected with an outlet of the compressor, a third interface of the four-way reversing valve is connected with an inlet of the compressor, a second interface of the four-way reversing valve is sequentially connected with the fan coil, the throttle valve and the inlet of the heat exchanger, and a fourth interface of the four-way reversing valve is connected with an outlet of the heat exchanger.

5. A refrigeration device seal detection system as recited in claim 2 or 3 further comprising:

a seventh conduit, comprising: the system comprises a twenty-first electromagnetic valve, a water tank, a water pump and a twenty-second electromagnetic valve which are sequentially connected, wherein the twenty-first electromagnetic valve and the twenty-second electromagnetic valve are respectively connected with different interfaces of the closed test box.

6. A method for implementing a leak test of a refrigeration device using the system of claims 1 to 5, comprising:

s100, carrying out vacuum pumping operation on a closed test box to enable the closed test box to have a vacuum test environment, wherein a to-be-tested part of a refrigerating device is positioned in the closed test box;

s101, filling compressed air with second preset pressure into the part to be tested, and maintaining the first preset time;

s102, collecting pressure variation of the closed test chamber, and measuring helium concentration of the closed test chamber by using a helium leak detector when the pressure variation of the closed test chamber is smaller than a first preset pressure fluctuation value; and

and S103, when the helium concentration of the closed test chamber is smaller than a first preset helium concentration value, filling the part to be tested with compressed helium with the second preset pressure and maintaining the first preset time, filling the part to be tested with compressed helium with the maximum preset pressure and maintaining the second preset time, and measuring the helium concentration of the closed test chamber by using the helium leak detector.

7. The method for detecting the tightness of a refrigerating device according to claim 6, wherein after the step S103, the method further comprises:

s104, when the helium concentration is smaller than a second preset helium concentration value, adjusting the environmental pressure of the closed test chamber to be normal pressure, vacuumizing the part to be tested to a fifth preset pressure value, and maintaining the third preset time; and

and S105, collecting the pressure variation of the component to be detected, sequentially repeating the steps from S100 to S103 when the pressure variation of the component to be detected is smaller than a second preset pressure fluctuation value and the shape of the component to be detected is not damaged or deformed, measuring the helium concentration of the closed test chamber by using the helium leak detector, and outputting qualified results of vacuum airtight detection and helium airtight detection of the component to be detected when the helium concentration is smaller than the second preset helium concentration value.

8. The method for detecting the tightness of a refrigerating device according to claim 6, wherein after the step S103, the method further comprises:

s201, when the helium concentration is smaller than a second preset helium concentration value, adjusting the environmental pressure of the closed test chamber to be normal pressure, filling water into the closed test chamber to a preset liquid level, vacuumizing the closed test chamber to the first preset pressure, and adjusting the environmental pressure of the closed test chamber to be normal pressure after keeping the fourth preset time;

s202, draining the water in the sealed test box, starting a refrigeration facility to adjust the environmental temperature of the sealed test box to a first preset temperature and keeping the environmental temperature for a fifth preset time so as to freeze the water attached to the outer wall of the component to be tested;

s203, filling normal-temperature water into the sealed test box to a preset liquid level, and maintaining for a sixth preset time to melt the water frozen on the outer wall of the component to be tested;

s204, repeating the S202 and the S203 in sequence to preset times; and

and S205, sequentially repeating the steps from S100 to S103, measuring the helium concentration of the closed test box by using the helium leak detector, and outputting qualified results of the freezing detection and the helium airtightness detection of the component to be detected when the helium concentration is less than the second preset helium concentration value.

9. The method for detecting the tightness of a refrigerating device according to claim 6, wherein after the step S103, the method further comprises:

s301, when the helium concentration is smaller than a second preset helium concentration value, filling compressed air with the maximum preset pressure into the part to be tested, adjusting the environmental temperature of the closed test chamber to the maximum preset temperature through a heating facility, and maintaining for a seventh preset time;

s302, reducing the internal pressure of the component to be tested to the minimum preset pressure under the condition of the maximum preset temperature, and maintaining the eighth preset time;

s303, repeating the S302 and the S303 in sequence to a preset number of times; and

and S304, sequentially repeating the steps from S100 to S103, measuring the helium concentration of the closed test box by using the helium leak detector, and outputting qualified results of temperature and pressure alternation detection and helium gas tightness detection of the component to be detected when the helium concentration is less than the second preset helium concentration value.

10. A computer-readable storage medium, characterized in that the storage medium stores a computer program for performing the method of any of the preceding claims 6 to 9.