Self-checking method and device of test equipment and test equipment

Abstract

The embodiment of the invention discloses a self-checking method and device for test equipment and the test equipment, and the method comprises the steps: monitoring the operation parameters of the test equipment in the process of replacing a tested sample piece and testing the tested sample piece; when it is monitored that the operation parameter is at the set value, the current pressure state of the test equipment is obtained; determining a refrigerant state of the current test equipment based on the current pressure state; and performing corresponding processing on the test equipment based on the determined refrigerant state. After the tested sample piece is replaced, the pressure state of the testing equipment under the set operation parameters is monitored in the testing process, then the refrigerant state of the testing equipment is determined, and the different refrigerant states are correspondingly processed, so that the technical problem that the refrigerant in the equipment is in an abnormal state after the tested sample piece is replaced by the testing equipment is solved, and the testing efficiency is improved. The technical effect of automatically detecting the abnormality of the refrigerant in the test equipment is achieved, the waste of test time is avoided, and the test cost is reduced.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of testing technology, and in particular to a self-test method and device for testing equipment, and testing equipment. Background Art

[0002] During the use of temperature-controlled multifunctional test equipment, the test samples need to be replaced frequently. Since the test samples are directly connected to the equipment refrigerant system, each time the test samples are replaced, the refrigerant in the previous test sample needs to be pumped out and refilled into the equipment side. Often, part of the refrigerant remains in the test sample in the form of liquid, and the refrigerant in the test sample cannot be completely pumped out. When the new test sample is connected to the test system, it must also be ensured that it is in a vacuum state before it can be connected to the system. After several replacements of the test samples, the test system often lacks refrigerant, the refrigerant is mixed with air, and the refrigerant leaks at the connection. These problems often lead to test failures and the control data cannot meet the set indicators.

[0003] However, existing technology can only detect refrigerant leakage points through leak detectors, and cannot detect issues such as the refrigerant quantity and whether there is impurity gas in the test system, which cannot meet customer needs. Summary of the Invention

[0004] The embodiments of the present invention provide a self-test method, device and test equipment for a test device, which solve the technical problem in the prior art that the refrigerant in the test device is in an abnormal state after the test sample is replaced.

[0005] An embodiment of the present invention provides a self-test method for a test device, the method comprising:

[0006] During the process of replacing the tested sample and testing the tested sample, the operating parameters of the test equipment are monitored, wherein the operating parameters include at least the compressor speed, the condensing fan speed and the main valve opening;

[0007] When it is monitored that the operating parameter is at a set value, obtaining a current pressure state of the test device;

[0008] Determining a current refrigerant state of the test device based on the current pressure state, wherein the refrigerant state includes at least excessive refrigerant, insufficient refrigerant, and impure refrigerant;

[0009] The test device is processed accordingly based on the determined refrigerant state.

[0010] Furthermore, when it is monitored that the operating parameter is at a set value, obtaining the current pressure state of the test device includes:

[0011] If the compressor speed is at the maximum rated speed, the condensing fan speed is lower than the first speed value, and the main valve opening is greater than the first opening value, then obtaining the first pressure state of the test equipment;

[0012] If the compressor speed is at the minimum rated speed, the condensing fan speed is higher than the second speed value, and the main valve opening is less than the second opening value, then obtaining the second pressure state of the test equipment;

[0013] If the compressor speed is at the middle value of the compressor rated speed, the condensing fan speed is at the middle value of the fan rated speed, and the main valve opening is at the set percentage opening value, then the third pressure state of the test equipment is obtained.

[0014] Further, determining the current refrigerant state of the test device based on the current pressure state includes:

[0015] If the first pressure state is that the exhaust side pressure value of the compressor of the test equipment is lower than the first set pressure value, and the suction side pressure value of the compressor of the test equipment is lower than the second set pressure value, then the refrigerant state is insufficient refrigerant.

[0016] Furthermore, determining the current refrigerant state of the test device based on the current pressure state further includes:

[0017] If the second pressure state is that the pressure value on the exhaust side of the compressor of the test equipment is higher than the third set pressure value, and the pressure value on the suction side of the compressor of the test equipment is higher than the fourth set pressure value, then the refrigerant state is refrigerant excess.

[0018] Furthermore, determining the current refrigerant state of the test device based on the current pressure state further includes:

[0019] If the third pressure state is that both the compressor exhaust side pressure value and the compressor suction side pressure value of the test equipment are in a fluctuating state, then the refrigerant state is that the refrigerant is impure.

[0020] Furthermore, performing corresponding processing on the test equipment based on the determined refrigerant state includes:

[0021] If the refrigerant status is that the refrigerant is too low, an alarm prompt is given, and a refrigerant charging machine is controlled to charge the test equipment with refrigerant.

[0022] Furthermore, performing corresponding processing on the test equipment based on the determined refrigerant state includes:

[0023] If the refrigerant status is that the refrigerant is excessive, an alarm is issued and a refrigerant charging machine is controlled to recover a set amount of refrigerant in the test equipment.

[0024] Furthermore, performing corresponding processing on the test equipment based on the determined refrigerant state includes:

[0025] If the refrigerant status is that the refrigerant is impure, an alarm prompt is issued.

[0026] An embodiment of the present invention further provides a self-test device for a test device, the device comprising:

[0027] A parameter monitoring unit, configured to monitor operating parameters of the test equipment during the process of replacing a test sample and testing the test sample, wherein the operating parameters include at least a compressor speed, a condensing fan speed, and a main valve opening;

[0028] a pressure state acquisition unit, configured to acquire a current pressure state of the test device when detecting that the operating parameter is at a set value;

[0029] a refrigerant state determining unit, configured to determine a current refrigerant state of the test device based on the current pressure state, wherein the refrigerant state includes at least an excess of refrigerant, a shortage of refrigerant, and impure refrigerant;

[0030] The device processing unit is used to perform corresponding processing on the test device based on the determined refrigerant state.

[0031] An embodiment of the present invention further provides a testing device, which includes the self-test device of the testing device in any of the above embodiments.

[0032] The embodiment of the present invention discloses a self-inspection method, device and test equipment for a test device, the method comprising: monitoring the operating parameters of the test device during the process of replacing the test sample and testing the test sample; obtaining the current pressure state of the test device when the operating parameters are monitored to be at the set value; determining the refrigerant state of the current test device based on the current pressure state; and performing corresponding processing on the test device based on the determined refrigerant state. The present invention solves the technical problem of abnormal refrigerant state in the test device after the test sample is replaced by monitoring the pressure state of the test device under the set operating parameters during the test process after the test sample is replaced, thereby determining the refrigerant state of the test device and performing corresponding processing on different refrigerant states, thereby achieving the technical effect of automatically detecting refrigerant anomalies inside the test device, avoiding the waste of test time and reducing test costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a flow chart of a self-test method for a test device provided by an embodiment of the present invention;

[0034] Figure 2is a structural diagram of a test device provided by an embodiment of the present invention;

[0035] Figure 3 It is a structural diagram of a self-test device of a test equipment provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0036] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all structures.

[0037] It should be noted that the terms "first," "second," and so on, in the specification, claims, and drawings of the present invention are used to distinguish different objects, and are not intended to limit a specific order. The following embodiments of the present invention can be implemented independently or in combination with each other, and the present invention does not impose specific limitations on this.

[0038] Figure 1 This is a flow chart of a self-test method for a test device provided by an embodiment of the present invention.

[0039] like Figure 1 As shown, the self-test method of the test equipment specifically includes the following steps:

[0040] S101, during the process of replacing the tested sample and testing the tested sample, monitoring the operating parameters of the test equipment, wherein the operating parameters at least include the compressor speed, the condensing fan speed and the main valve opening.

[0041] Specifically, after the test piece is replaced, some refrigerant will remain in the previous test piece in liquid form. If the refrigerant in the previous test piece cannot be completely pumped out and re-injected into the test piece, the test piece will be short of refrigerant. Alternatively, when the test piece is connected to the test piece, a vacuum state must be maintained. If air is introduced during the replacement process, the test piece will be filled with impure refrigerant. Therefore, after replacing the test piece, it is necessary to monitor some operating parameters of the test piece during the test of the new test piece to determine whether there is a refrigerant anomaly.

[0042] Figure 2 It is a structural diagram of the testing equipment provided by an embodiment of the present invention.

[0043] like Figure 2As shown, the test equipment includes a compressor 10; a condenser 20, a liquid accumulator 30, an electronic expansion valve 60, an inlet shutoff solenoid valve 71, and an inlet connecting pipe 81, which are sequentially connected to the outlet of the compressor 10; and an outlet shutoff solenoid valve 72 and an outlet connecting pipe 82, which are sequentially connected to the inlet of the compressor 10. The inlet connecting pipe 81 and the outlet connecting pipe 82 are used to connect to a test sample 90.

[0044] like Figure 2 As shown, the test equipment further includes a condenser fan 21 disposed at the condenser 20, a first pressure sensor 41 and a first temperature sensor 51 disposed between the liquid reservoir 30 and the electronic expansion valve 60, a second pressure sensor 42 and a second temperature sensor 52 disposed at the inlet connecting pipe 81, and a third pressure sensor 43 and a third temperature sensor 53 disposed at the outlet connecting pipe 82. The electronic expansion valve 60 is the main valve.

[0045] S102, when it is monitored that the operating parameter is at the set value, obtaining the current pressure state of the test equipment.

[0046] Specifically, when the operating parameters of each device in the test equipment reach the set value, the current pressure state of the test equipment is monitored to determine whether there is any abnormality in the refrigerant in the test equipment, such as Figure 2 As shown, the first pressure sensor 41 is used to measure the pressure value on the exhaust side of the compressor, which is usually a higher pressure value, and the third pressure sensor 43 is used to measure the pressure value on the intake side of the compressor, which is usually a lower pressure value.

[0047] S103, determining the refrigerant state of the current test equipment based on the current pressure state, wherein the refrigerant state at least includes excessive refrigerant, insufficient refrigerant, and impure refrigerant.

[0048] Specifically, after determining the current pressure state, the refrigerant state of the test equipment at that time can be determined based on the determined current pressure state. For example, when the compressor speed reaches the maximum rated speed and the condenser fan speed reaches the minimum rated speed, but the pressure value on the compressor exhaust side still does not reach the set pressure value required by the user, this indicates that there is a lack of refrigerant in the equipment, that is, there is too little refrigerant, so even if the compressor speed reaches the maximum value, it cannot meet the set pressure value required by the user.

[0049] S104: Perform corresponding processing on the test equipment based on the determined refrigerant state.

[0050] Specifically, after determining the current refrigerant status of the test equipment, corresponding processing can be taken according to the current refrigerant status, such as issuing an alarm when the refrigerant is insufficient, and automatically filling the test equipment with refrigerant, etc., so as to realize the function of automatic detection and processing of the test equipment. At the same time, since the detection and processing are all automated, it can not only detect the health status of the equipment operation in real time, issue early warning information, and improve work efficiency, but also effectively reduce the user's loss in testing time and testing costs, making it convenient for users to use.

[0051] The present invention monitors the pressure state of the test equipment under the set operating parameters during the test process after the test sample is replaced, thereby determining the refrigerant state of the test equipment and performing corresponding processing on different refrigerant states. This solves the technical problem in the prior art that the refrigerant in the test equipment is in an abnormal state after the test sample is replaced, and achieves the technical effect of automatically detecting refrigerant abnormalities inside the test equipment, avoiding waste of test time and reducing test costs.

[0052] Based on the above technical solutions, S102 specifically includes:

[0053] S1021: If the compressor speed is at the maximum rated speed, the condensing fan speed is lower than the first speed value, and the main valve opening is greater than the first opening value, then obtain the first pressure state of the test equipment.

[0054] Specifically, the first speed value can be set to 200 rpm as needed, and the first opening value can be set to 100 steps as needed. Then, when the compressor speed is at the maximum rated speed of the compressor, the condensing fan speed is lower than 200 rpm, and the opening of the electronic expansion valve 60 (i.e., the main valve) is greater than 200 steps, the current pressure state of the test equipment, i.e., the first pressure state, is obtained.

[0055] Optionally, based on step S1021, S103 specifically includes: if the first pressure state is that the compressor exhaust side pressure value of the test equipment is lower than the first set pressure value, and the compressor suction side pressure value of the test equipment is lower than the second set pressure value, then the refrigerant state is too little refrigerant.

[0056] Specifically, the first set pressure value is determined based on the user's target pressure value and is usually a higher pressure value. The second set pressure value is the lower limit threshold of the low pressure value on the suction side of the compressor at which the test equipment can maintain normal operation. If the first pressure state is that the pressure value on the exhaust side of the compressor of the test equipment is lower than the first set pressure value, and the pressure value on the suction side of the compressor of the test equipment is lower than the second set pressure value, that is, the high pressure of the equipment is lower, the low pressure is also lower, and the heat generation of the load is larger at this time, then it means that the compressor speed is at the maximum rated speed of the compressor and cannot achieve the target pressure value expected by the user. Therefore, it can be judged that the refrigerant state at this time is that there is too little refrigerant and the required cooling demand cannot be achieved.

[0057] Optionally, S104 specifically includes: if the refrigerant status is that the refrigerant is too low, an alarm is issued, and a refrigerant charging machine is controlled to charge the test equipment with refrigerant.

[0058] Specifically, when it is determined that the test equipment is currently in a state of too little refrigerant, an alarm prompt will be issued to let the tester know that there is a refrigerant abnormality problem in the current test equipment. At the same time, the test equipment can detect the most suitable refrigerant amount under the current working conditions, so that the amount of refrigerant shortage can be accurately judged, and through the change of the refrigerant state, it can automatically determine whether the test equipment has a micro leak point, and then automatically fill the refrigerant in the test equipment through the pre-connected refrigerant filling machine, thereby reducing the burden on the tester.

[0059] S1022: If the compressor speed is at the minimum rated speed, the condensing fan speed is higher than the second speed value, and the main valve opening is less than the second opening value, then obtain the second pressure state of the test equipment.

[0060] Specifically, the second speed value can be set to 1500 rpm as needed, and the second opening value can be set to 50 steps as needed. Then, when the compressor speed is at the minimum rated speed of the compressor, the condensing fan speed is higher than 1500 rpm, and the opening of the electronic expansion valve 60 (i.e., the main valve) is less than 50 steps, the current pressure state of the test equipment, i.e., the second pressure state, is obtained.

[0061] Optionally, based on step S1022, S103 specifically includes: if the second pressure state is that the compressor exhaust side pressure value of the test equipment is higher than the third set pressure value, and the compressor suction side pressure value of the test equipment is higher than the fourth set pressure value, then the refrigerant state is refrigerant excess.

[0062] Specifically, the third set pressure value is the upper threshold value of the high pressure value on the exhaust side of the compressor that can maintain normal operation of the test equipment, and the fourth set pressure value is the upper threshold value of the low pressure value on the suction side of the compressor that can maintain normal operation of the test equipment. If the second pressure state is that the pressure value on the exhaust side of the compressor of the test equipment is higher than the third set pressure value, and the pressure value on the suction side of the compressor of the test equipment is higher than the fourth set pressure value, that is, the high pressure of the equipment is higher, the low pressure is also higher, and the heat generation of the load at this time is smaller, then it indicates that the compressor speed at this time is at the minimum rated speed of the compressor and is still higher than the upper threshold value of the high pressure on the exhaust side of the compressor. Therefore, it can be determined that the refrigerant state at this time is refrigerant excess.

[0063] Optionally, S104 specifically includes: if the refrigerant status is refrigerant overdose, issuing an alarm prompt, and controlling the refrigerant charging machine to recover a set amount of refrigerant in the test equipment.

[0064] Specifically, when it is determined that the test equipment is currently in a state of excessive refrigerant, an alarm prompt will be issued to let the tester know that there is a refrigerant abnormality problem in the current test equipment. At the same time, the test equipment can detect the most suitable refrigerant amount under the current working conditions, so that the amount of excess refrigerant can be accurately judged, and then the refrigerant in the test equipment can be automatically recovered through the pre-connected refrigerant filling machine, thereby reducing the amount of refrigerant in the test equipment and alleviating the burden on the tester.

[0065] S1023, if the compressor speed is at the middle value of the compressor rated speed, the condensing fan speed is at the middle value of the fan rated speed, and the main valve opening is at the set percentage opening value, then obtain the third pressure state of the test equipment.

[0066] Specifically, when the compressor speed is at 50% of the rated speed of the compressor, the condensing fan speed is at 50% of the rated speed of the fan, and the opening of the electronic expansion valve 60 (i.e., the main valve) is fixed to 30% of the maximum opening, the current pressure state of the test equipment is obtained, i.e., the third pressure state.

[0067] Optionally, based on step S1023, S103 specifically includes: if the third pressure state is that the compressor discharge side pressure value and the compressor suction side pressure value of the test device are both in a fluctuating state, then the refrigerant state is impure refrigerant. Optionally, S104 specifically includes: if the refrigerant state is impure refrigerant, issuing an alarm prompt.

[0068] Specifically, if the third pressure state is that the compressor exhaust side pressure value and the compressor suction side pressure value of the test equipment are both in a fluctuating state and cannot be constant in a stable state, and the load is constant at this time, it indicates that the refrigerant in the test equipment is mixed with impurities. Therefore, it can be judged that the refrigerant state at this time is that the refrigerant is impure. At this time, the test equipment will issue an alarm prompting the tester to replace the refrigerant in the test equipment.

[0069] In an embodiment of the present invention, the self-test method of the test equipment provided by the embodiment of the present invention automatically detects refrigerant anomalies inside the test equipment, greatly reducing the user's test time loss due to equipment refrigerant anomalies, helping the user to quickly locate abnormal problems of the test equipment, reducing the user's economic losses, and playing a great role in improving the overall performance of the equipment. It not only greatly improves work efficiency, but also reduces the burden on testers.

[0070] Figure 3 It is a structural diagram of a self-test device of a test equipment provided by an embodiment of the present invention.

[0071] like Figure 3 As shown, the self-test device of the test equipment specifically includes:

[0072] The parameter monitoring unit 31 is used to monitor the operating parameters of the test equipment during the process of replacing the test sample and testing the test sample, wherein the operating parameters include at least the compressor speed, the condensing fan speed and the main valve opening;

[0073] The pressure state acquisition unit 32 is used to acquire the current pressure state of the test device when the operating parameter is monitored to be at the set value;

[0074] A refrigerant state determination unit 33 is configured to determine a refrigerant state of the current test device based on the current pressure state, wherein the refrigerant state includes at least an excess of refrigerant, a shortage of refrigerant, and impure refrigerant;

[0075] The equipment processing unit 34 is used to perform corresponding processing on the test equipment based on the determined refrigerant state.

[0076] Optionally, the pressure state acquiring unit 32 is specifically configured to:

[0077] If the compressor speed is at the maximum rated speed, the condensing fan speed is lower than the first speed value, and the main valve opening is greater than the first opening value, then obtaining a first pressure state of the test equipment;

[0078] If the compressor speed is at the minimum rated speed, the condensing fan speed is higher than the second speed value, and the main valve opening is less than the second opening value, then obtaining a second pressure state of the test equipment;

[0079] If the compressor speed is at the middle value of the compressor rated speed, the condensing fan speed is at the middle value of the fan rated speed, and the main valve opening is at the set percentage opening value, the third pressure state of the test equipment is obtained.

[0080] Optionally, the refrigerant state determining unit 33 is specifically configured to:

[0081] If the first pressure state is that the exhaust side pressure value of the test equipment's compressor is lower than the first set pressure value, and the suction side pressure value of the test equipment's compressor is lower than the second set pressure value, then the refrigerant state is too little refrigerant.

[0082] Optionally, the refrigerant state determining unit 33 is further configured to:

[0083] If the second pressure state is that the exhaust side pressure value of the compressor of the test equipment is higher than the third set pressure value, and the suction side pressure value of the compressor of the test equipment is higher than the fourth set pressure value, the refrigerant state is refrigerant excess.

[0084] Optionally, the refrigerant state determining unit 33 is further configured to:

[0085] If the third pressure state is that both the compressor exhaust side pressure value and the compressor suction side pressure value of the test equipment are in a fluctuating state, the refrigerant state is that the refrigerant is impure.

[0086] Optionally, the device processing unit 34 is specifically configured to:

[0087] If the refrigerant status is that the refrigerant is too low, an alarm prompt will be issued, and the refrigerant charging machine will be controlled to charge the test equipment with refrigerant.

[0088] Optionally, the device processing unit 34 is further configured to:

[0089] If the refrigerant status is refrigerant overload, an alarm will be issued and the refrigerant charging machine will be controlled to recover a set amount of refrigerant in the test equipment.

[0090] Optionally, the device processing unit 34 is further configured to:

[0091] If the refrigerant status is impure, an alarm will be issued.

[0092] The self-test device of the test equipment provided in the embodiment of the present invention has the same technical features as the self-test method of the test equipment provided in the above embodiment, and therefore can also solve the same technical problems and achieve the same technical effects.

[0093] An embodiment of the present invention further provides a testing device, which includes the self-test device of the testing device in any of the above embodiments.

[0094] The test device provided in the embodiment of the present invention includes the self-test device of the test device in the above embodiment. Therefore, the test device provided in the embodiment of the present invention also has the beneficial effects described in the above embodiment, which will not be described in detail here.

[0095] In the description of the embodiments of the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0096] Finally, it should be noted that the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the scope of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A self-test method for a test device, characterized in that: The method comprises: During the process of replacing the tested sample and testing the tested sample, the operating parameters of the test equipment are monitored, wherein the operating parameters include at least the compressor speed, the condensing fan speed and the main valve opening; When it is monitored that the operating parameter is at a set value, obtaining a current pressure state of the test device; Determining a current refrigerant state of the test device based on the current pressure state, wherein the refrigerant state includes at least excessive refrigerant, insufficient refrigerant, and impure refrigerant; The test equipment is processed accordingly based on the determined refrigerant state.

2. The self-test method of the test equipment according to claim 1, characterized in that: When it is monitored that the operating parameter is at a set value, obtaining the current pressure state of the test device includes: If the compressor speed is at the maximum rated speed, the condensing fan speed is lower than the first speed value, and the main valve opening is greater than the first opening value, then obtaining the first pressure state of the test equipment; If the compressor speed is at the minimum rated speed, the condensing fan speed is higher than the second speed value, and the main valve opening is less than the second opening value, then obtaining the second pressure state of the test equipment; If the compressor speed is at the middle value of the compressor rated speed, the condensing fan speed is at the middle value of the fan rated speed, and the main valve opening is at the set percentage opening value, then the third pressure state of the test equipment is obtained.

3. The self-test method of the test equipment according to claim 2, characterized in that: Determining the current refrigerant state of the test equipment based on the current pressure state includes: If the first pressure state is that the exhaust side pressure value of the compressor of the test equipment is lower than the first set pressure value, and the suction side pressure value of the compressor of the test equipment is lower than the second set pressure value, then the refrigerant state is insufficient refrigerant.

4. The self-test method of the test equipment according to claim 2, characterized in that: Determining the current refrigerant state of the test device based on the current pressure state further includes: If the second pressure state is that the pressure value on the exhaust side of the compressor of the test equipment is higher than the third set pressure value, and the pressure value on the suction side of the compressor of the test equipment is higher than the fourth set pressure value, then the refrigerant state is refrigerant excess.

5. The self-test method of the test equipment according to claim 2, characterized in that: Determining the current refrigerant state of the test device based on the current pressure state further includes: If the third pressure state is that both the compressor exhaust side pressure value and the compressor suction side pressure value of the test equipment are in a fluctuating state, then the refrigerant state is that the refrigerant is impure.

6. The self-test method of the test equipment according to claim 3, characterized in that: The corresponding processing of the test equipment based on the determined refrigerant state includes: If the refrigerant status is that the refrigerant is too low, an alarm prompt is given, and a refrigerant charging machine is controlled to charge the test equipment with refrigerant.

7. The self-test method of the test equipment according to claim 4, characterized in that: The corresponding processing of the test equipment based on the determined refrigerant state includes: If the refrigerant status is that the refrigerant is excessive, an alarm is issued and a refrigerant charging machine is controlled to recover a set amount of refrigerant in the test equipment.

8. The self-test method of the test equipment according to claim 5, characterized in that: The corresponding processing of the test equipment based on the determined refrigerant state includes: If the refrigerant status is that the refrigerant is impure, an alarm prompt is issued.

9. A self-test device for a test device, characterized in that: The device comprises: A parameter monitoring unit, configured to monitor operating parameters of the test equipment during the process of replacing a test sample and testing the test sample, wherein the operating parameters include at least a compressor speed, a condensing fan speed, and a main valve opening; a pressure state acquisition unit, configured to acquire a current pressure state of the test device when detecting that the operating parameter is at a set value; a refrigerant state determining unit, configured to determine a current refrigerant state of the test device based on the current pressure state, wherein the refrigerant state includes at least an excess of refrigerant, a shortage of refrigerant, and impure refrigerant; The device processing unit is used to perform corresponding processing on the test device based on the determined refrigerant state.

10. A testing device, characterized in that: The testing device comprises the self-testing device of the testing device according to claim 9.

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