CN213579972U - Air tightness detection device of refrigerating system - Google Patents

Air tightness detection device of refrigerating system Download PDF

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CN213579972U
CN213579972U CN202021942246.8U CN202021942246U CN213579972U CN 213579972 U CN213579972 U CN 213579972U CN 202021942246 U CN202021942246 U CN 202021942246U CN 213579972 U CN213579972 U CN 213579972U
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sample
vacuum
vacuum box
gas
pressure
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何冠成
吴志东
李斌诚
戴兴学
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Vkan Certification And Testing Co ltd
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Vkan Certification And Testing Co ltd
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Abstract

The utility model discloses a refrigerating system gas tightness detection device, including the vacuum chamber, with the inflation system of vacuum chamber intercommunication, vacuum chamber manage to find time the system, be used for detecting tracer gas's leak hunting system, still include through the pipeline seal penetrate the vacuum chamber inboard so that fill system, tracer gas fill system, sample manage to find time system and exhaust emission system with the inboard high-pressure gas who detects the sample intercommunication of vacuum chamber, detection device still includes control system, control system is used for controlling the working process of other each system. The utility model discloses detecting refrigerating system's gas tightness and falling into two flows, avoiding adopting unified detection standard to leaking greatly, leaking for a short time, the overall inefficiency that the standard caused is strict, the not high problem of detection precision that the standard pine caused, the utility model discloses so set up, be favorable to compromise detection precision and efficiency.

Description

Air tightness detection device of refrigerating system
Technical Field
The utility model belongs to the technical field of refrigeration plant leakproofness detects.
Background
Many refrigeration plant spare part and pipe fitting need detect its leakproofness in process of production, prevent to take place to leak, cause the waste of the energy, even produce the potential safety hazard. The traditional leakage detection methods mainly comprise the following methods:
first, a sample to be measured is filled with water or other liquid, and the amount of decrease of the filled medium in a specific time is observed and measured, such as whether the liquid level at a certain position is decreased or not is detected. This is a direct way of measurement.
Secondly, the sample to be detected is filled with gas with certain pressure, usually compressed air, and is placed in water for observation after pressure maintaining, and whether bubbles are generated around the sample to be detected is used as a standard for judging whether leakage exists.
Thirdly, injecting water or other liquid media into the sample to be tested, pressurizing and maintaining pressure, and if the pressure of the sample to be tested does not drop during the test, determining that the sample has no leakage.
The above method has the following disadvantages:
firstly, the method detects whether the sample leaks or not by injecting water, the method is complex to operate and has high requirements on operators, whether the sample leaks or not can be judged only by observing the sample with naked eyes of the operators, the overall detection precision is not high, and specific leakage points cannot be found out;
secondly, gas pressure maintaining is adopted for placing in water for leak detection, the method is high in operation difficulty, pure manual control is achieved, and the error of a measurement result is large;
and thirdly, leak detection is realized by observing pressure change through water injection and pressure maintaining, the method firstly needs to be connected with a water pipe in a butt joint mode, the operation is complex, the precision is not high, a pressurizing device needs to be calibrated frequently, in addition, a refrigerating system after water injection and pressure maintaining is basically scrapped, and the detection cost is high.
In summary, the above three methods can achieve leak detection, but all have the problem of low leak detection precision, and for products with high requirement for air tightness level, the requirements for air tightness test cannot be met, and also all have the disadvantages of high detection cost caused by complex operation, low detection efficiency, and the like.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a compromise the refrigerating system gas tightness detection device of leak hunting precision and detection efficiency. The utility model provides a refrigerating system indicates refrigeration plant itself or includes refrigeration plant and rather than the seal part who connects.
The technical scheme adopted by the utility model is as follows: a device for detecting the air tightness of a refrigerating system comprises a vacuum box, an inflation system, a vacuum box evacuation system and a leakage detection system, wherein the inflation system is communicated with the vacuum box, the leakage detection system is used for detecting trace gas, the device also comprises a high-pressure gas inflation system (the high pressure is higher than the atmospheric pressure) which penetrates into the inner side of the vacuum box through a pipeline seal so as to be communicated with a detected sample in the inner side of the vacuum box, the trace gas inflation system, the sample evacuation system and a waste gas discharge system, and a vacuum gauge for measuring the degree of vacuum of the gas in the vacuum chamber and the sample, the pressure gauge is used for measuring the pressure of the gas in the vacuum box and the sample, the detection device also comprises a control system, the control system is respectively connected with the vacuum gauge, the pressure gauge and other systems, and controls the working processes of other systems according to the monitoring values of the vacuum gauge and the pressure gauge.
During detection, firstly, the vacuum box is vacuumized through the vacuum box vacuumizing system, meanwhile, high-pressure gas is filled into a detected sample (located in the vacuum box) through the high-pressure gas filling system, and whether the sample is leaked greatly or not is detected by monitoring the change of the pressure in the vacuum box. If the sample has large leakage, the sample is exhausted through the waste gas exhaust system, and meanwhile, the vacuum box is inflated and broken through the inflation system. And taking out the sample after the air is broken. And if the coarse inspection process passes, entering a fine inspection process: firstly, exhausting a sample through a waste gas discharge system, then vacuumizing the sample and a vacuum box, then detecting the concentration of the tracer gas in the vacuum box for the first time through a leakage detection system, suppressing the signal to zero, then filling the sample with the tracer gas, detecting the concentration of the tracer gas in the vacuum box for the second time through the leakage detection system, and judging whether the sample leaks for a short time or not according to a detection result. After the fine inspection process, the vacuum box is emptied, meanwhile, the sample is exhausted, and the sample is taken out and marked.
The detection device further comprises a gas storage tank which is connected in pipelines communicated with the detected sample through the high-pressure gas charging system, the tracer gas charging system, the sample evacuating system and the waste gas discharging system.
The high-pressure gas filling system, the trace gas filling system, the sample evacuating system and the waste gas discharging system are communicated with the inner side of the vacuum box through the same pipeline, and the communication relation between the high-pressure gas filling system, the trace gas filling system, the sample evacuating system and the waste gas discharging system and the detected sample is controlled through electromagnetic valves respectively.
The sample evacuation system is evacuated through the vacuum pump, the exhaust gas discharge system is connected with the output end of the vacuum pump of the sample evacuation system through the electromagnetic valve, so that the sample evacuation system and the exhaust gas discharge system can share one vacuum pump, the utilization rate of the vacuum pump is improved, and the device cost is saved.
The appearance design of the detection device becomes a rectangular box body, the front of the box body is provided with a plurality of lattice structures, the left lower side is a vacuum box, the upper left side is a sample placing area, the upper right side is an electric appliance control cabinet, a touch display screen and a plurality of control buttons are arranged on a cabinet door of the electric appliance control cabinet, the leak detection system comprises a leak detector, and the leak detector can be detachably placed in an instrument cabinet below the electric appliance control cabinet.
The end of the pipeline which penetrates the inner side of the vacuum box in a sealing way so as to be communicated with the detected sample at the inner side of the vacuum box is provided with a quick connector.
The pipeline which is arranged at the inner side of the vacuum box and communicated with the detected sample adopts a flexible pipe with the pressure resistance of 6 Mpa.
The utility model discloses be suitable for the detection standard: ISO 14903-2017, IEC 60335-2-40: 2018.
Has the advantages that:
1) the utility model discloses divide into two flows with refrigerating system's gas tightness detection, avoid adopting unified detection standard to big hourglass, little hourglass, the overall inefficiency that the standard is strict causes, the problem that the detection precision is not high that the standard pine caused, the utility model discloses so set up, be favorable to taking into account detection precision and efficiency;
2) the utility model arranges the sample to be detected in the vacuum box, adjusts the pressure difference between the sample to be detected and the vacuum box, judges whether the sample to be detected has large leakage or not by detecting the pressure change in the vacuum box, if the sample to be detected has large leakage, the requirement on precision and efficiency can be completely met by the rough detection in the mode; different from a coarse detection mode, the fine detection is realized by detecting whether the detected sample has trace gas leakage or not, and the mode can realize higher detection precision and detection efficiency under the condition that the sample only has fine leakage. And only adopt the tracer gas representation method in the accurate detection environment, can effectively avoid tracer gas's waste. Compared with the prior art, the utility model discloses the gas tightness test demand of the product that the gas tightness grade requirement can be satisfied better to the detection mode, easy operation moreover, efficient does not cause the damage to being detected the sample, and the aforesaid is various, makes the utility model discloses the mode can obviously reduce the detection cost.
Drawings
Fig. 1 is a schematic view of a detection device according to a preferred embodiment of the present invention;
FIG. 2 is a schematic view of the overall structure of the detecting device according to the preferred embodiment of the present invention;
FIG. 3 is a schematic diagram of the connection of some modules of the detecting device according to the preferred embodiment of the present invention;
fig. 4 is a wiring diagram of a control circuit of the detecting device according to the preferred embodiment of the present invention.
Detailed Description
The air tightness detection of the refrigerating system by using the detection device of the embodiment mainly comprises the following steps: during detection, firstly, filling high-pressure nitrogen into a detected sample (positioned in a vacuum box), and then detecting leakage by monitoring the change of the pressure in the vacuum box; and then, according to the basic leak detection principle of helium leak detection, helium is used as tracer gas, the helium is filled into the detected sample, and then the helium leak detector is used for detecting whether the tracer gas exists in the vacuum box or not, so that the precise detection of the detected sample is realized. The method can judge the leakage condition of the detected sample rapidly and accurately with high precision.
The following is a detailed description of the above-described method.
Fig. 1 is a schematic diagram of the detecting device of the present embodiment. The following describes the specific working process of the detection device of the present embodiment in detail with reference to the schematic diagram:
1. coarse inspection
After the vacuum box door is closed, the control system opens the electromagnetic valve V6, simultaneously starts the vacuum pump 1, and performs rough pumping and fine pumping on the vacuum box in sequence until the vacuum degree in the box reaches the set leak detection pressure, such as 50 Pa. When the vacuum box is vacuumized, the control system opens the electromagnetic valve V1, high-pressure nitrogen gas of 2.0MPa (adjustable range: 0.5-2 MPa) is filled into a detected sample in the box, then pressure maintaining is carried out, and after a set time, the control system judges whether large leakage exists according to a detection result of a pressure gauge (used for monitoring the air pressure in the vacuum box). If the sample has large leakage, the control system exhausts the high-pressure gas in the sample, simultaneously closes an air exhaust valve V6 of the vacuum box, terminates the rough detection program, and opens a V7 to fill the vacuum box with the atmosphere. The operator presses the confirmation button on the touch screen of the control system, the vacuum box door is automatically opened, the sample is taken out, and the sample is placed in the to-be-treated area after being marked. And if the control system does not find the sample leakage, automatically entering the next step of leakage detection program.
In this embodiment, after maintaining the pressure for a period of time, the value of the pressure gauge is observed, and whether the rough inspection of the detected sample passes or not is judged. In other embodiments, whether to end the rough inspection may also be controlled by time-matching a pressure change threshold. If the set time is up or the pressure increment exceeds the pressure change threshold, the rough detection of the detected sample is judged to be unqualified. Compared with the two control modes, the former is simple, and the latter is generally more efficient.
2. Precision inspection
2-1) evacuating the sample: if no sample leakage is found, the control system opens the V3, the V4 and the vacuum pump 2 to discharge high-pressure gas in the sample, then closes the V4, vacuumizes the interior of the sample, stops vacuuming after the vacuum degree in the sample reaches a set pressure value, and waits for the completion of the vacuumizing process of the vacuum box. The set value of the vacuum degree in the sample is set according to the accuracy which needs to be achieved by the sample needing to be subjected to leak detection, namely the air tightness grade which needs to be tested, and the higher the vacuum degree is, the higher the air tightness grade which can be tested is. Generally, 1500Pa is set as the low detection pressure setting value, 200Pa is set as the medium detection pressure setting value, and 20Pa is set as the fine detection pressure setting value.
2-2) vacuum helium testing: when the evacuation of the vacuum box reaches the set leak detection pressure and is usually set to be 40Pa, and meanwhile, the evacuation of a sample in the box is finished, the control system firstly opens the V5 and the vacuum pump 3, detects the concentration of helium in the vacuum box through the leak detector, inhibits zero of the signal, then opens the V2, fills helium of 2.0Mpa (adjustable range: 0.5-2 MPa) into the sample, and after the pressure of the helium in the sample reaches the set value, the leak detector carries out leak detection on the sample again. If the leak detector finds that the helium signal exceeds the set value, the sample in the box leaks slightly, the control system automatically carries out circulating detection on the sample, namely the current helium signal is suppressed to zero again, the above detection is repeated, and after 1-3 times of repeated detection (each time lasts for 3-8 minutes), if the problem still exists, the sample is judged to have the leakage, and the signal lamp displays reminding. And opening the V7, automatically opening the vacuum box after the vacuum box is filled with the atmosphere, and taking out and marking the sample after an operator can separate the quick connector from the sample. If the leak detector does not detect a helium signal exceeding the set value, it indicates that the sample to be tested is not leaking, and the control system sends a signal that the test is passed. The leak detector adopted in this embodiment is of the following instrument type: 231B, manufacturer: and (5) a Wan instrument.
2-3) helium gas emission: after the sample detection is passed, the V3, the V4 and the vacuum pump 2 are started again, helium in the sample is automatically discharged, meanwhile, the control system starts the V7 to fill air into the vacuum box, when the pressure of the vacuum box rises to the atmospheric pressure, the door of the vacuum box is automatically opened, the detection procedure is completed, and the product is manually taken down.
The gas storage tank in fig. 1 is used for buffering and stabilizing pressure so as to stabilize the gas pressure in the sample. The detection device monitors the pressure of the gas in the vacuum box and the sample through the pressure gauge, monitors the vacuum degree of the gas in the vacuum box and the sample through the vacuum gauge, and the specific installation positions of the gas and the vacuum gauge, and a person skilled in the art can select a proper position to install according to the detection process in the embodiment. In this embodiment, the pressure gauge is mainly used for detecting the pressure of the high-pressure (higher than atmospheric pressure) gas to make up for the deficiency of the vacuum gauge in detecting the high-pressure gas.
In the embodiment, helium is used as the tracer gas, and the detection cost is substantially as follows: one bottle of helium with the volume of 40L and the pressure of 15MPa and the purity of 99.9 percent is about 2000 yuan. The volume converted to one atmosphere is: 40Lx150 ═ 6000L. 5000L can be used by removing the residual factors in the bottle, so that the unit volume cost of helium is 0.4 yuan/L. Therefore, when helium is used as the tracer gas, the test cost can be well controlled.
Fig. 2 is a schematic view of the overall structure of the detecting device of the present embodiment. As shown in fig. 2, the detection device is designed as a rectangular box. The front of this box is equipped with a plurality of lattice structures, and left side below is vacuum box 11, and the upper left side is the sample and places district 12, and the upper right side is electrical control cabinet 13, and touch display screen 131 and a plurality of control button 132 set up on electrical control cabinet 13's cabinet door, and leak detector 2 places in instrument cabinet 14 of electrical control cabinet 13 below. Other structures are all arranged in the box body. The detection device of the structure has the following characteristics:
1) the vacuum box is reasonable in position, and a large detected sample can be conveniently tested;
2) the electrical socket of the leak detector 2 is directly inserted into the instrument cabinet 14 and is fixed to the cabinet wall of the instrument cabinet 14. The leak detector 2 is arranged in the instrument cabinet 14, can be conveniently connected with electricity to form a part of the detection device of the embodiment, and can also be taken out at any time for independent use;
3) the integrity of the device is better.
The connection of the tubing system to the vacuum box and sample in fig. 1 is as follows:
the pipeline system is communicated with the inner side of the vacuum box through a joint which is hermetically arranged on the wall of the vacuum box, and the pipeline system used for being connected with the sample is further communicated with a quick joint through a high-pressure-resistant flexible pipe (the pressure resistance is up to 6Mpa) which is easy to bend so as to be conveniently and quickly connected with the sample through the quick joint. The quick connector interface pipe diameter adopted in the embodiment is provided with 5/8-turn 3/8, 1/4, 1/2 and 3/4 copper pipe connectors which are respectively provided with two sets. Is provided with a digital display torque wrench set.
The control system of the above detection device is mainly composed of a PLC, a switching value expansion module FBs-8YR, an analog value expansion module FBs-4A2D, and a touch panel, as shown in fig. 3 and 4. The touch screen and the leak detector are respectively connected with the PLC, and the PLC is also respectively connected with a switching value expansion module FBs-8YR and an analog value expansion module FBs-4A2D which are respectively used for expanding a switching value contact and an analog value contact of the PLC. Various data acquisition devices in the detection device mainly refer to a pressure gauge, a vacuum gauge, a leak detector and the like, various indicator lamps and electromagnetic valves are respectively connected with a control system, and the connection relationship between the indicator lamps and the electromagnetic valves and the control system is specifically shown in fig. 4. The pressure gauge is used for detecting the pressure during inflation so as to judge whether the inflated pressure meets, and the vacuum gauge is used for detecting during vacuum pumping so as to judge whether the vacuum in the vacuum box and the vacuum in the sample reach a set value. The pressure gauge, the vacuum gauge and the leak detector are connected with the analog quantity expansion module FBs-4A2D, and the acquired real-time value is output to the PLC so that the PLC can make a judgment.
Different from the prior art, the leak detector of the embodiment is additionally provided with an analog quantity monitoring end besides finishing information interaction (transmitting various information including leakage rate) by connecting with the PLC through a 485 bus. The communication connection through the 485 bus can inevitably have some delay conditions, and the connection between the added leak detector and the analog quantity expansion module FBs-4A2D feeds back the real-time leakage rate of the leak detector to the analog quantity input of the PLC through the analog quantity signal output so as to improve the control precision of the control system.
The main technical parameters of the detection device are as follows:
minimum detectable leak rate: 5X 10-12Pa·m3/s;
Leak rate display range: 1X 10-3~1×10-12Pa·m3Start-up time (referring to the time required for the device to perform a self-test process before each power-on): less than or equal to 5min
Response time (time for the leaked helium molecules to undergo signal conversion by molecular pumping to the helium mass spectrometer chamber): <1S leak detection port maximum pressure (leak detector maximum pressure to evacuate): 1300Pa
Ultimate vacuum degree (supported by vacuum box)Ultimate pressure experienced): 5X 10-1Pa
The device adopts a process flow automation technology, combines process equipment with an electric automatic control technology, automatically controls the whole sample detection process flow by the PLC and the touch screen, and an operator only needs to install and uninstall a sample without judging the result of each process flow, and automatically judges the result of the previous step and completes the execution of the next step by the PLC according to preset conditions.
The detection device has the characteristics of simplicity in operation, high automation degree, safety, high efficiency, high leakage detection precision and the like.
The utility model is suitable for an all refrigerating system spare part and complete machine leakproofness test, the range is wide, and the precision is high, has extensive range of application.

Claims (7)

1. The air tightness detection device of the refrigeration system is characterized by comprising a vacuum box, an inflation system, a vacuum box evacuation system and a leak detection system, wherein the inflation system is communicated with the vacuum box, the vacuum box evacuation system is used for detecting trace gas, the device also comprises a high-pressure gas inflation system, a trace gas inflation system, a sample evacuation system and a waste gas discharge system which are hermetically penetrated into the inner side of the vacuum box through pipelines so as to be communicated with a detected sample on the inner side of the vacuum box, and a vacuum gauge for measuring the degree of vacuum of the gas in the vacuum chamber and the sample, the pressure gauge is used for measuring the pressure of the gas in the vacuum box and the sample, the detection device also comprises a control system, the control system is respectively connected with the vacuum gauge, the pressure gauge and other systems, and controls the working processes of other systems according to the monitoring values of the vacuum gauge and the pressure gauge.
2. The air-tightness detection device of a refrigerating system according to claim 1, further comprising an air storage tank connected in a pipeline where the high-pressure gas charging system, the trace gas charging system, the sample evacuation system and the exhaust gas discharge system are communicated with a detected sample.
3. The air-tightness detecting device of a refrigerating system as claimed in claim 2, wherein the high pressure gas charging system, the trace gas charging system, the sample evacuating system and the waste gas discharging system are communicated with the inside of the vacuum box through the same pipeline, and are respectively controlled by the solenoid valves to communicate with the detected sample.
4. The air-tightness detecting device for refrigerating system according to claim 3, wherein the sample evacuating system is evacuated by a vacuum pump, and the exhaust gas discharging system is connected with an output end of the vacuum pump of the sample evacuating system through a solenoid valve.
5. The device for detecting the airtightness of a refrigerating system according to claim 1, wherein the detecting device is designed into a rectangular box body, the front surface of the box body is provided with a plurality of grid structures, the lower left side is provided with a vacuum box, the upper left side is provided with a sample placing area, the upper right side is provided with an electrical control cabinet, the touch display screen and a plurality of control buttons are arranged on a cabinet door of the electrical control cabinet, the leak detection system comprises a leak detector, and the leak detector is detachably arranged in an instrument cabinet below the electrical control cabinet.
6. The device for detecting the airtightness of a refrigerating system according to claim 2, wherein a quick-connect joint is provided at the end of the pipe which is hermetically inserted into the inside of the vacuum box so as to communicate with the sample to be detected inside the vacuum box.
7. The device for detecting the airtightness of a refrigerating system according to claim 6, wherein a flexible tube having a pressure of up to 6Mpa is used as a pipe inside the vacuum box for communicating with the sample to be detected.
CN202021942246.8U 2020-09-08 2020-09-08 Air tightness detection device of refrigerating system Active CN213579972U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114486104A (en) * 2022-01-26 2022-05-13 中家院(北京)检测认证有限公司 System and method for detecting sealing performance of refrigerating device and storage medium
CN116046299A (en) * 2023-03-28 2023-05-02 常州雷哈那机械有限公司 Automobile water tank detection device
CN117147067A (en) * 2023-10-12 2023-12-01 国网湖北省电力有限公司超高压公司 Electric equipment hidden danger detection method and system based on SF6 gas analysis

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114486104A (en) * 2022-01-26 2022-05-13 中家院(北京)检测认证有限公司 System and method for detecting sealing performance of refrigerating device and storage medium
CN116046299A (en) * 2023-03-28 2023-05-02 常州雷哈那机械有限公司 Automobile water tank detection device
CN117147067A (en) * 2023-10-12 2023-12-01 国网湖北省电力有限公司超高压公司 Electric equipment hidden danger detection method and system based on SF6 gas analysis

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