CN114878111B - Leakage detecting method and leakage detecting device for air conditioner heat exchanger - Google Patents
Leakage detecting method and leakage detecting device for air conditioner heat exchanger Download PDFInfo
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- CN114878111B CN114878111B CN202210482188.2A CN202210482188A CN114878111B CN 114878111 B CN114878111 B CN 114878111B CN 202210482188 A CN202210482188 A CN 202210482188A CN 114878111 B CN114878111 B CN 114878111B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M3/00—Investigating fluid-tightness of structures
- G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
- G01M3/26—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors
- G01M3/32—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators
- G01M3/3236—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by monitoring the interior space of the containers
- G01M3/3272—Investigating fluid-tightness of structures by using fluid or vacuum by measuring rate of loss or gain of fluid, e.g. by pressure-responsive devices, by flow detectors for containers, e.g. radiators by monitoring the interior space of the containers for verifying the internal pressure of closed containers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
Abstract
The invention provides a leak detection method and a leak detection device for an air conditioner heat exchanger. The leak detection method of the air conditioner heat exchanger comprises the steps of plugging an air outlet of the heat exchanger and filling gas into the heat exchanger; when the acquired first internal pressure data reach a preset value, continuing to charge gas into the heat exchanger and maintaining the first preset duration; stopping inflation when the second internal pressure data reaches a preset value; and performing pressure maintaining test. The leak detection device is used for realizing the leak detection method; the leak detection device comprises an air inlet mechanism, a pressure sensor and a plugging mechanism; the air inlet mechanism comprises an air inlet pipeline and a valve body, the first end of the air inlet pipeline is used for being communicated with an air source, the second end of the air inlet pipeline is communicated with an air inlet of the heat exchanger, and the valve body is used for controlling the opening degree of the air inlet pipeline; the pressure sensor is used for detecting the internal pressure of the heat exchanger; according to the invention, aiming at the specificity of the heat exchanger, the accuracy of the internal pressure data before pressure maintaining is ensured, the leakage rate is calculated and the basis of judging whether the workpiece is qualified or not is more accurate for the subsequent pressure maintaining test, and the leakage detecting accuracy is improved.
Description
Technical Field
The invention relates to the technical field of detection methods, in particular to a leakage detection method and a leakage detection device for an air conditioner heat exchanger.
Background
In the production process of two air-conditioning devices (a condenser and an evaporator), in order to avoid quality accidents of air-conditioning refrigerant leakage caused by poor compactness, leakage detection operation is required to be carried out on the two air-conditioning devices.
The leak detection operation comprises a large leak detection operation and a micro leak detection operation which are sequentially carried out. The micro leakage detection operation is generally to fill helium with certain pressure into a workpiece, then place the workpiece into a vacuum box, and judge the compactness of the workpiece according to the leakage rate of the helium. But the leakage detection method is mainly used for detecting the leakage of the workpiece with helium leakage rate of-6 and below. And the workpiece with the helium leakage rate of more than-6 cannot be subjected to the method of helium detection by using the vacuum box, because the workpiece with the helium leakage rate of more than-6 leaks enough helium gas to pollute the vacuum box and the surrounding environment, so that the vacuum box is frequently and false-alarmed.
For a workpiece with helium leakage rate above-6, the workpiece is usually screened out through large leakage detection operation at the previous station of vacuum box helium detection, the large leakage detection operation is realized based on a differential pressure principle, the common large leakage detection device mainly comprises an air inlet mechanism, a pressure sensor and a plug mechanism, the plug mechanism seals an air outlet pipeline of the workpiece, the air inlet mechanism fills a certain amount of high-pressure gas into the workpiece from the air inlet pipeline of the workpiece, then the workpiece is subjected to pressure maintaining for a period of time, the pressure sensor records the pressure difference between the workpiece before and after the pressure maintaining, and whether the compactness of the workpiece is qualified or not is judged through the pressure difference.
The existing large leakage detection method has the problems that although the internal pressure of the air conditioner is quickly increased to reach a preset value in the air charging process, the pressure sensor detects that the internal pressure reaches the preset value and then enters a pressure maintaining test, a plurality of tortuous capillaries are arranged in the air conditioner, and the capillaries of the air conditioner are filled with air at the moment, so that the pressure detection result after pressure maintaining is influenced, false alarm is easy to occur, the large leakage detection method can only judge that a detected workpiece leaks or does not leak, the leakage rate of the workpiece cannot be accurately displayed, and the production quality is inconvenient to control.
Disclosure of Invention
The invention mainly aims to provide a leakage detection method of an air conditioner heat exchanger aiming at two air conditioners to improve leakage detection accuracy.
Another object of the present invention is to provide a leak detection apparatus for implementing the leak detection method of the air conditioner heat exchanger.
The invention mainly aims to provide a leak detection method of an air conditioner heat exchanger, which comprises the steps of plugging an air outlet of the heat exchanger, and filling air into the heat exchanger from an air inlet of the heat exchanger; acquiring first internal pressure data of the heat exchanger, judging whether the first internal pressure data reach a preset value, if so, continuously filling gas into the heat exchanger and maintaining the first preset time period; acquiring second internal pressure data of the heat exchanger, judging whether the second internal pressure data reach a preset value, and if so, stopping inflating the heat exchanger; and performing pressure maintaining test.
Compared with the more general differential pressure leakage detection method in the prior art, the differential pressure leakage detection method is characterized in that when the pressure sensor judges that the acquired first internal pressure data reach a preset value for the first time, the pressure sensor does not stop charging to enter a pressure maintaining test stage at the first time, but keeps continuously charging until the heat exchanger is actually filled with gas, then the acquired internal pressure data before pressure maintaining is more accurate, and the differential pressure leakage detection method is a basis for the subsequent pressure maintaining test, the calculation of leakage rate and the judgment of whether a workpiece is qualified or not, so that the leakage detection accuracy is improved.
The further scheme is that the step of pressure maintaining test comprises the steps of obtaining the pressure data before pressure maintaining of the heat exchanger; after maintaining the pressure for a second preset time period, acquiring pressure-maintaining internal pressure data of the heat exchanger; and generating leakage rate data according to the internal pressure data before pressure maintaining and the internal pressure data after pressure maintaining.
From the above, the second internal pressure data and the third internal pressure data obtained after the pressure maintaining is completed are more accurate, so that the leak rate data calculated from the second internal pressure data and the third internal pressure data is more accurate.
According to the still further scheme, after the step of generating leakage rate data according to the internal pressure data before pressure maintaining and the internal pressure data after pressure maintaining, whether the heat exchanger is qualified in detection or not is judged according to the leakage rate data, and a detection result is generated; and displaying the leakage rate data and/or the detection result on an interface of the terminal equipment.
From the above, after the leak detection is finished, the control system records the leak detection result in the system memory, and can provide a visual data query interface, and a detector and even a user can query all detection records of the history, so that quality control of the production process and traceability of the production quality are realized.
And in a further scheme, after judging whether the heat exchanger is qualified according to the leakage rate data and generating a detection result, evacuating the heat exchanger.
From the above, the pressure release and vacuum pumping treatment are needed to be carried out on the heat exchanger after the omission is finished so as to ensure the quality of the heat exchanger and avoid pollution.
Further, if the second internal pressure data reaches the preset value, the heat exchanger is evacuated.
From the above, if the judging result of the step of judging whether the second internal pressure data reaches the preset value is that the second internal pressure data is not equal to the preset value, the heat exchanger workpiece has a large leakage problem, and the second internal pressure data is judged to be a defective product, so that the subsequent pressure maintaining test is not needed to be carried out, and the pressure releasing and vacuumizing treatment is directly carried out on the workpiece.
Still further, the first preset duration is determined according to the model of the heat exchanger.
From the above, the first preset duration is related to the structure of the heat exchanger, specifically, the bending degree of each position in the heat exchanger, the length of the bending portion, the cross-sectional area of the bending portion, and other parameters, so that the optimal time value obtained after limited tests for each heat exchanger of different models is required to be used as the first preset duration, thereby ensuring the effectiveness of the time-delay charging operation and avoiding the influence of insufficient charging on the leakage detection result.
The leakage detection device of the air conditioner heat exchanger provided by the other object of the invention is used for realizing the leakage detection method of the air conditioner heat exchanger; the leak detection device comprises an air inlet mechanism, a pressure sensor and a plugging mechanism; the air inlet mechanism comprises an air inlet pipeline and a valve body arranged on the air inlet pipeline, the first end of the air inlet pipeline is used for being communicated with an air source, the second end of the air inlet pipeline is used for being communicated with an air inlet of the heat exchanger, and the valve body is used for controlling the opening degree of the air inlet pipeline; the pressure sensor is used for detecting the internal pressure of the heat exchanger; the blocking mechanism is used for blocking the air outlet of the heat exchanger.
According to the leakage detection device, the leakage detection method can be realized, when the pressure sensor judges that the acquired first internal pressure data reach the preset value for the first time, the pressure sensor does not stop charging at the first time and enters a pressure maintaining test stage, but keeps continuously charging until the heat exchanger is actually filled with gas, the charging is stopped, the acquired second internal pressure data are more accurate, more accurate calculation basis is provided for subsequently judging whether the workpiece is qualified or not and calculating the leakage rate, and therefore the leakage detection accuracy is improved.
The leak detection device further comprises an evacuating mechanism, wherein the evacuating mechanism comprises a pressure release pipeline and a vacuumizing pipeline; the pressure release pipeline is provided with a pressure release valve, and the vacuumizing pipeline is provided with a vacuumizing valve and a vacuum pump; the pressure release pipeline is communicated with the air inlet pipeline, and the vacuumizing pipeline is communicated with the air inlet pipeline.
Therefore, the evacuation mechanism can effectively release pressure and evacuate the vacuum pipeline and the inside of the detected workpiece.
Further, the valve body and the pressure sensor are sequentially arranged on the air inlet pipeline from the first end to the second end of the air inlet pipeline.
The pressure sensor is arranged on the air inlet pipeline close to the air inlet of the heat exchanger.
From the above, because the second end of the air inlet pipeline is communicated with the air inlet of the detected heat exchanger, the pressure of the second end of the air inlet pipeline is equal to the internal pressure of the heat exchanger, and therefore, the setting position of the pressure sensor is as close to the second end as possible, and the accuracy of detecting the internal pressure of the heat exchanger can be ensured.
Drawings
Fig. 1 is a schematic diagram of connection between an embodiment of a leak detection device of an air conditioner heat exchanger and a heat exchanger to be tested according to the present invention.
Fig. 2 is a flow chart of an embodiment of a leak detection method for an air conditioning heat exchanger of the present invention.
Detailed Description
Leak detection device embodiment of air conditioner heat exchanger
Referring to fig. 1, the leak detection device is used for implementing a leak detection method of the air-conditioning heat exchanger based on the differential pressure principle. The leak detection device comprises an air inlet mechanism, a pressure sensor 3, a plugging mechanism and an evacuating mechanism, wherein the air inlet mechanism comprises an air inlet pipeline 1 and an inflation pneumatic valve 2, the plugging mechanism mainly comprises a plugging head (not shown in the figure), and the evacuating mechanism comprises a pressure release pipeline and a vacuumizing pipeline; the pressure release pipeline is provided with a pressure release pneumatic valve 7, the vacuumizing pipeline is provided with a vacuumizing pneumatic valve 5 and a vacuum pump 6, wherein the inflating pneumatic valve 2 is a valve body of the invention, the vacuumizing pneumatic valve 5 is the vacuumizing valve 5 of the invention, and the pressure release pneumatic valve 7 is the pressure release valve 7 of the invention.
The first end of the air inlet pipeline 1 is used for being communicated with an air source (not shown in the figure), the air source is a high-pressure air storage tank, the second end of the air inlet pipeline is used for being communicated with an air inlet of the heat exchanger 4, the valve body 2 and the pressure sensor 3 are sequentially arranged on the air inlet pipeline 1 from the first end to the second end of the air inlet pipeline 1, the pneumatic valve 2 is used for controlling the opening degree of the air inlet pipeline 1, the pneumatic valve 2 can charge constant-pressure air into the heat exchanger 4, the pressure sensor 3 is used for detecting the internal pressure of the heat exchanger 4, the pressure sensor 3 is arranged on the air inlet pipeline 1 and is close to the air inlet of the heat exchanger 4, and the pressure of the second end of the air inlet pipeline 1 is equal to the internal pressure of the heat exchanger 4 due to the fact that the second end of the air inlet pipeline 1 is communicated with the air inlet of the detected heat exchanger 4, and therefore the setting position of the pressure sensor 3 is as close to the second end as possible, and accuracy of detecting the internal pressure of the heat exchanger 4 can be guaranteed.
The pressure release pipeline provided with the pressure release pneumatic valve 7 is communicated with the air inlet pipeline 1, the vacuumizing pipeline provided with the vacuumizing pneumatic valve 5 and the vacuum pump 6 is communicated with the air inlet pipeline 1, and the air inlet pipeline 1, the vacuumizing pneumatic valve 5 and the vacuum pump 6 are sequentially communicated.
Leak detection method embodiment of air conditioner heat exchanger
The leak detection method of the invention utilizes the leak detection device and is used for carrying out leak detection on the air conditioner heat exchanger. The leak detection method mainly comprises three parts, namely a connecting step, an inflation leak detection step and a workpiece evacuation step, which are sequentially carried out.
Referring to fig. 1, first, the connection step mainly connects the heat exchanger 4 to be detected with the leak detection device, the air outlet of the heat exchanger 4 is plugged by a plugging head, and the air inlet of the heat exchanger 4 is communicated with the second end of the air inlet pipeline 1.
Referring to fig. 1 and 2, in the inflation detecting step, step S1 is first performed, the inflation pneumatic valve 2 is opened, and the air source, the air intake pipe 1 and the detected heat exchanger 4 are sequentially communicated. During inflation, the internal pressure of the heat exchanger 4 is seen to rise rapidly from the degree of the pressure sensor 3. Thereafter, the system performs step S2, acquires real-time first internal pressure data of the heat exchanger 4 through the pressure sensor 3 and judges that the first internal pressure data is greater than or equal to a preset value, for example, the preset value is 2.8MPa. If not, continuing to charge the heat exchanger 4 and continuing to perform the judging step S2. And when the judgment result of the step S2 is yes, it means that the pressure sensor 3 detects that the internal pressure of the heat exchanger 4 at this time has reached the preset value. But in practice the heat exchanger 4 is now not filled with gas.
At this point the system performs step S3, without closing the inflation pneumatic valve 2, while maintaining the inflation of the heat exchanger 4 for the next 6 seconds. After the 6 second keeping inflation is finished, the system executes a judging step S4, and the pressure sensor 3 acquires the second internal pressure data of the heat exchanger 4 at the moment and judges that the first internal pressure data is larger than or equal to a preset value. If the result of the determination is no, this means that the detected heat exchanger 4 still cannot reach the preset pressure value even after the time delay is inflated, and the leak rate of the detected heat exchanger 4 is high, so step S15 is executed, and the system determines that the detection is failed and records the detection result.
And when the judgment result of the step S4 is yes, it indicates that the inside of the heat exchanger 4 including the plurality of bent capillaries is filled with gas and reaches the preset pressure value, and the step S5 is executed, and the inflation pneumatic valve 2 is closed to stop inflating the heat exchanger 4.
And then executing a pressure maintaining test step: after the step S5 is completed, the step S6 is performed after the pneumatic valve 2 is closed, the step S7 is performed after the pressure sensor 3 obtains the data of the internal pressure before the pressure maintaining of the heat exchanger 4, and the pressure maintaining process is performed for 6 seconds, that is, the current internal air pressure is maintained, and the pressure maintaining process is not performed, and the pressure releasing process is not performed. After the pressure maintaining process is completed for 6 seconds, the step S8 is executed, and the pressure sensor 3 acquires the internal pressure data of the heat exchanger 4 after pressure maintaining.
The system then executes step S9 to calculate the leak rate according to the difference between the obtained pre-holding pressure data and the post-holding pressure data. Further, the leakage amount V is calculated according to the following formula L ：
Wherein V is L Is the leakage quantity (unit: cc/s) to be found; ΔP is the pressure difference (unit: mmH) generated in the dwell time 2 O), i.e., the difference between the internal pressure data before the pressure maintaining and the internal pressure data after the pressure maintaining; v is the internal volume (unit: cc) of the heat exchanger 4, T is the dwell time (unit: s), in this example, the dwell time is 6 seconds, P 0 Is at atmospheric pressure (unit: mmH) 2 O). And can then be based on the leakage quantity V L And converting the leakage rate.
After step S9 is completed, step S14 is executed, and the calculated leakage rate about the heat exchanger 4 is recorded and stored in a data table corresponding to the heat exchanger 4; in addition, after step S9 is completed, a determining step S10 is further executed to determine whether the calculated leakage rate is smaller than a preset value, if yes, the leakage rate of the heat exchanger 4 is lower, so step S11 is executed to determine that the heat exchanger 4 is qualified for detection; if not, the leakage rate of the heat exchanger 4 is high, so that the step S15 is executed to judge that the heat exchanger 4 is unqualified. Step S12 is executed after determining whether or not the detected heat exchanger 4 is acceptable in step S11 or step S15, and the detection result of the heat exchanger 4 is recorded. After step S15 is executed if the determination result in step S4 is negative, step 12 is similarly continued.
In addition, after the system records the leakage rate of each heat exchanger 4 through step S14 and records and stores the detection result of each heat exchanger 4 through step S12, the system edits and collates the leakage rate data and the detection result data related to each heat exchanger 4 into a form such as a table or a graph which is beneficial to visualization and displays the form in a screen interface of a terminal device such as a tablet computer, a computer or a mobile phone used by a leak detector for monitoring or controlling the leak detection system, in addition, the leakage rate data and the detection result data can be stored in a data list under an air conditioner number, and when a user inputs an air conditioner code through an official query interface to query each detection data of the air conditioner, the related leakage rate data and detection result of the heat exchanger 4 can be searched. Therefore, quality control of the production process can be realized, and traceability of production quality can be realized.
After step S12 is completed, the inspection heat exchanger 4 needs to be subjected to an evacuation process including a pressure release process and a vacuum evacuation process which are sequentially performed. And (3) pressure release treatment: the pressure release pneumatic valve 7 is opened to discharge the high-pressure gas in the heat exchanger 4 and the air intake pipe 1 into the air, and the pressure release process can be completed in a short time due to the high-pressure compressed gas being filled. And (3) vacuumizing: in the pressure release processing process, the pressure sensor 3 acquires real-time internal pressure data, and when the real-time internal pressure data is lower than a preset threshold value, the vacuum pump 6 is started, and meanwhile, the vacuumizing pneumatic valve 5 is opened to vacuumize the air inlet pipeline, the pressure release pipeline, the vacuumizing pipeline and the heat exchanger 4.
Table 1 below shows data obtained after a group of heat exchangers tested with different leakage levels were tested in the leak detection apparatus of the present invention using the leak detection method of the present invention. Wherein, the equivalent internal volume of the group of a plurality of heat exchangers is 5L, the dwell time is 6S, and the pressure difference in the following table refers to the difference value between the internal pressure data before dwell and the internal pressure data after dwell.
| Dwell time | Differential pressure | Leakage rate |
| 6S | 1KPa | 8.07E-6 |
| 6S | 5KPa | 4.03E-5 |
| 6S | 12KPa | 9.68E-5 |
| 6S | 20KPa | 1.61E-4 |
Table 1 leakage rate conversion table
Compared with the pressure difference leakage detecting method for the conventional inner contour workpiece in the prior art, the pressure difference leakage detecting method for the conventional inner contour workpiece in the invention aims at the influence caused by the multi-bending structure of the heat exchanger, when the pressure sensor judges that the acquired first inner pressure data reaches a preset value for the first time, the pressure sensor stops charging at the first time and enters a pressure maintaining test stage, but keeps continuously charging until the heat exchanger is actually filled with gas, the acquired inner pressure data before pressure maintaining is more accurate, and the basis for the subsequent pressure maintaining test, the calculation of leakage rate and the judgment of whether the workpiece is qualified or not is provided, so that the leakage detecting accuracy is improved.
Finally, it should be emphasized that the foregoing description is merely illustrative of the preferred embodiments of the invention, and that various changes and modifications can be made by those skilled in the art without departing from the spirit and principles of the invention, and any such modifications, equivalents, improvements, etc. are intended to be included within the scope of the invention.
Claims (10)
1. The leak detection method of the air conditioner heat exchanger comprises the following steps:
after the air outlet of the heat exchanger is blocked, filling gas into the heat exchanger from the air inlet of the heat exchanger;
the method is characterized in that:
acquiring first internal pressure data of the heat exchanger, judging whether the first internal pressure data reach a preset value, if so, not entering a pressure maintaining test, keeping continuously filling gas into the heat exchanger and maintaining a first preset time length, wherein the first preset time length is related to the bending degree of each position in the heat exchanger, the length of a bending part and the cross-sectional area of the bending part, and the optimal time value obtained after limited times of tests for each heat exchanger of different types is used as the first preset time length;
acquiring second internal pressure data of the heat exchanger, judging whether the second internal pressure data reaches the preset value again, and if so, stopping inflating the heat exchanger;
performing pressure maintaining test;
and if the second internal pressure data reach the preset value, determining that the detection is failed.
2. The leak detection method for an air conditioner heat exchanger according to claim 1, comprising:
the pressure maintaining test comprises the following steps of:
acquiring pressure-maintaining internal pressure data of the heat exchanger;
after maintaining the pressure for a second preset time period, acquiring pressure-maintaining internal pressure data of the heat exchanger;
and generating leakage rate data according to the internal pressure data before pressure maintaining and the internal pressure data after pressure maintaining.
3. The leak detection method for an air conditioner heat exchanger according to claim 2, comprising:
after the step of generating the leakage rate data according to the internal pressure data before pressure maintaining and the internal pressure data after pressure maintaining, the method further comprises the following steps:
judging whether the heat exchanger is qualified according to the leakage rate data and generating a detection result;
and displaying the leakage rate data and/or the detection result on an interface of the terminal equipment.
4. A method of leak detection for an air conditioning heat exchanger as defined in claim 3, comprising:
after the step of judging whether the heat exchanger is qualified according to the leakage rate data and generating a detection result, the method further comprises the following steps:
and evacuating the heat exchanger.
5. The leak detection method of an air conditioner heat exchanger according to any one of claims 1 to 4, comprising:
and if the second internal pressure data does not reach the preset value, carrying out evacuation treatment on the heat exchanger.
6. The leak detection method of an air conditioner heat exchanger according to any one of claims 1 to 4, comprising:
and determining the first preset duration according to the model of the heat exchanger.
7. Leak hunting device of air conditioner heat exchanger, its characterized in that:
a leak detection method for implementing an air conditioning heat exchanger according to any of the preceding claims 1 to 6;
the leak detection device comprises an air inlet mechanism, a pressure sensor and a plugging mechanism;
the air inlet mechanism comprises an air inlet pipeline and a valve body arranged on the air inlet pipeline, the first end of the air inlet pipeline is used for being communicated with an air source, the second end of the air inlet pipeline is used for being communicated with an air inlet of the heat exchanger, and the valve body is used for controlling the opening degree of the air inlet pipeline;
the pressure sensor is used for detecting the internal pressure of the heat exchanger;
the blocking mechanism is used for blocking the air outlet of the heat exchanger.
8. The apparatus for leak detection of an air conditioner heat exchanger as defined in claim 7, wherein:
the leak detection device also comprises an evacuation mechanism, wherein the evacuation mechanism comprises a pressure release pipeline and a vacuum evacuation pipeline;
the pressure release pipeline is provided with a pressure release valve, and the vacuumizing pipeline is provided with a vacuumizing valve and a vacuum pump;
the pressure release pipeline is communicated with the air inlet pipeline, and the vacuumizing pipeline is communicated with the air inlet pipeline.
9. The leak detection apparatus for an air conditioner heat exchanger according to claim 7 or 8, wherein:
the valve body and the pressure sensor are sequentially arranged on the air inlet pipeline from the first end to the second end of the air inlet pipeline.
10. The apparatus for leak detection of an air conditioner heat exchanger as defined in claim 9, wherein:
the pressure sensor is arranged on the air inlet pipeline close to the air inlet of the heat exchanger.
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