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CN-122016180-A - Hydrogen and nitrogen leakage detection system and leakage detection method thereof

CN122016180ACN 122016180 ACN122016180 ACN 122016180ACN-122016180-A

Abstract

The invention discloses a hydrogen and nitrogen leakage detection system, which comprises a test cover, a vacuum module and a hydrogen and nitrogen leakage detection module. Compared with the prior art, the hydrogen-nitrogen leakage detection system and the leakage detection method thereof have the beneficial effects that the vacuum environment can be artificially constructed by introducing the test cover and matching with the vacuum module, so that the detection requirements under different pressure environments can be flexibly met, the interference of environmental noise on leakage detection results can be eliminated, the residual air is avoided to dilute hydrogen and nitrogen, and the detection precision and detection speed are greatly improved. In addition, through setting up the judgment mechanism of multilevel, can only detect the leak rate of the product that is surveyed under the prerequisite that guarantees that the product that is surveyed does not have heavy-calibre leak source, every level detects and goes on under the condition that accords with the requirement to the possibility of erroneous judgement has also greatly promoted detection efficiency when effectively reducing.

Inventors

  • ZHANG YINGSHAN
  • LI WENFENG

Assignees

  • 东莞海瑞思测控技术有限公司

Dates

Publication Date
20260512
Application Date
20260413

Claims (10)

  1. 1. A hydrogen nitrogen leak detection system, comprising: The test cover is provided with an inner space for accommodating a tested product; the vacuum module is connected with the test cover and can be started and stopped as required to vacuumize or break the internal space of the test cover; the hydrogen-nitrogen leakage detection module is connected with the tested product and can be started and stopped as required to detect the tracer gas escape condition of the tested product.
  2. 2. The hydrogen-nitrogen leak detection system of claim 1, wherein the vacuum module comprises a negative pressure source, a vacuum valve and a pressure gauge, wherein the vacuum valve is arranged between and connects the negative pressure source and the test cover, the pressure gauge is arranged inside the test cover, and the pressure gauge is fixedly connected with the test cover.
  3. 3. The hydrogen-nitrogen leak detection system of claim 2, wherein the vacuum module further comprises a vacuum breaker disposed outside the test enclosure, one end of the vacuum breaker being in communication with the test enclosure and the other end of the vacuum breaker being in communication with an external atmosphere.
  4. 4. The hydrogen-nitrogen leak detection system of claim 1, wherein the hydrogen-nitrogen leak detection module comprises a leak detector, a hydrogen-nitrogen source, and a hydrogen probe, wherein the hydrogen-nitrogen source is removably coupled to a current product under test via the leak detector, wherein a probe of the hydrogen probe extends into the test housing, and wherein the hydrogen probe interacts with the leak detector to report real-time hydrogen concentration data to the leak detector.
  5. 5. The hydrogen-nitrogen leak detection system of claim 4, wherein the hydrogen-nitrogen leak detection module further comprises a gas supply conduit disposed between the hydrogen-nitrogen source and the leak detector for communication therewith, a gas exhaust conduit disposed between the leak detector and a gas outlet of a product currently being tested for communication therewith, and a gas fill conduit disposed between the leak detector and a gas fill port of the product currently being tested for communication therewith.
  6. 6. A hydrogen nitrogen leak detection method based on a hydrogen nitrogen leak detection system according to any one of claims 1-5, comprising: s1, loading a tested product into the test cover, and connecting the hydrogen nitrogen leakage detection module with the tested product; S2, vacuumizing the interior of the current tested product to judge whether the current tested product has a large-caliber leakage point, if so, jumping to S5, otherwise jumping to S3; s3, vacuumizing the test cover; s4, filling hydrogen and nitrogen into the tested product, and detecting the change of the hydrogen concentration in the test cover to acquire the leakage rate of the current tested product; S5, opening the test cover, taking out the tested product and recording the leakage condition and the test data of the tested product.
  7. 7. The method for detecting leakage of hydrogen and nitrogen according to claim 6, wherein S1 is specifically that the gas supply pipeline is used for communicating the hydrogen and nitrogen source with the leak detector, the product to be detected is filled into the test cover, the gas exhaust pipeline is used for communicating the leak detector with the gas exhaust port of the product to be detected, and the gas charging pipeline is used for communicating the leak detector with the gas charging port of the product to be detected.
  8. 8. The method for detecting hydrogen and nitrogen leakage according to claim 6, wherein S2 is specifically that the leak detector presets a first vacuum degree threshold and a first time threshold, the leak detector vacuumizes the interior of the currently detected product through the exhaust pipeline, if the vacuum degree of the currently detected product cannot reach the first vacuum degree threshold level within the first time threshold, the leak point with a large caliber exists in the currently detected product is judged, and S5 is skipped, and S3 is skipped otherwise.
  9. 9. The method for detecting hydrogen and nitrogen leakage according to claim 6, wherein S3 is specifically that a second vacuum degree threshold is preset, the vacuumizing valve is opened, the test cover is connected and communicated with the negative pressure source, the internal space of the test cover is continuously vacuumized by the negative pressure source, real-time data of the pressure gauge are observed, and when the real-time data of the pressure gauge reach the second vacuum degree threshold, the vacuumizing valve is closed; Or, presetting a second time threshold, opening the vacuum valve within the second time threshold, connecting and communicating the test cover with the negative pressure source, and continuously vacuumizing the inner space of the test cover by using the negative pressure source.
  10. 10. The method for detecting hydrogen and nitrogen leakage according to claim 7, wherein the step S4 is specifically that a hydrogen and nitrogen pressure threshold is preset, the hydrogen and nitrogen source sequentially fills hydrogen and nitrogen mixed gas into the tested product along the gas supply pipeline, the leak detector and the gas filling pipeline, and after the tested product begins to be filled with gas and reaches the hydrogen and nitrogen pressure threshold level, the hydrogen concentration change data inside the test cover is detected by the hydrogen detecting gun extending into the test cover.

Description

Hydrogen and nitrogen leakage detection system and leakage detection method thereof Technical Field The invention relates to the technical field of air tightness detection, in particular to a hydrogen nitrogen leakage detection system and a leakage detection method thereof. Background The leak detection principle of the hydrogen-nitrogen leak detector is mainly based on ‌ using a mixed gas of 5% hydrogen and 95% nitrogen as a tracer gas ‌, and using a mixed gas of 5% hydrogen and 95% nitrogen as a tracer gas in the detection process. The mixed gas can fully utilize the advantages of incombustibility, non-toxicity, non-corrosiveness ‌ of nitrogen ‌, safety and environmental protection, combines the advantages of strong hydrogen diffusivity and high escape property, and can quickly penetrate through a tiny leakage path, and when in actual use, the leakage point is detected by a high-sensitivity hydrogen sensor, and the hydrogen escape condition detected by the hydrogen sensor is used as an actual leakage detection result. The leak detection process is typically accomplished in the prior art with a separate hydrogen-nitrogen leak detector. When the hydrogen-nitrogen leak detector provided by the prior art is applied to a specific leak detection scene, the hydrogen-nitrogen leak detector is usually realized in a sniffing mode or a collecting mode ‌, wherein mixed gas of 5% hydrogen and 95% nitrogen is introduced into a product to be detected through a gas port before detection in the sniffing mode, then a hand-held probe is used for directly scanning the surface of a workpiece to accurately position a leak point, a sealing cover is correspondingly arranged on the hydrogen-nitrogen leak detector working in the collecting mode, the product to be detected is placed in the sealing cover, trace gas is filled into the product to be detected, and the leak rate information of the product to be detected is obtained by detecting the hydrogen concentration or the pressure change in the sealing cover. It should be noted that the hydrogen-nitrogen leak detector provided in the prior art has obvious defects in specific application, on one hand, when the hydrogen-nitrogen leak detector implemented in the sniffing mode is actually applied, the environmental noise has a great influence on the leak detection result, and if other hydrogen sources exist in the environment, such as electrolysis, chemical emission and the like, false alarm may be generated, and the reliability of the detection result is not strong. In practical application, the hydrogen-nitrogen leak detector implemented in the collection mode is not difficult to infer according to the instrument setting and the detection process, although the sealed cover isolates the detected product from the external environment, after the detected product is put into the sealed cover, the original leaked external environment gas still remains in the sealed cover, so that the collection mode also faces the problem of influence of environmental noise similar to the sniffing mode on a leak detection result, meanwhile, because the external environment gas remains in the sealed cover, after the hydrogen-nitrogen is filled into the detected product, if a leak point exists in the detected product, the hydrogen-nitrogen filled into the detected product dilutes the leaked hydrogen-nitrogen after the leaked hydrogen-nitrogen is dissipated into the test cover through the leak point, and the hydrogen-nitrogen in the test cover can be accumulated to a measurable concentration level only after waiting for a long time, so that the detection efficiency is seriously slowed down. Disclosure of Invention The invention aims to provide a hydrogen nitrogen leakage detection system and a leakage detection method thereof, wherein the hydrogen nitrogen leakage detection system has more reliable detection results and higher detection efficiency. In order to achieve the above purpose, the present invention provides the following technical solutions: a hydrogen-nitrogen leak detection system, comprising: The test cover is provided with an inner space for accommodating a tested product; the vacuum module is connected with the test cover and can be started and stopped as required to vacuumize or break the internal space of the test cover; the hydrogen-nitrogen leakage detection module is connected with the tested product and can be started and stopped as required to detect the tracer gas escape condition of the tested product. Optionally, the vacuum module comprises a negative pressure source, a vacuumizing valve and a pressure gauge, wherein the vacuumizing valve is arranged between the negative pressure source and the test cover and is connected with the negative pressure source and the test cover, and the pressure gauge is arranged inside the test cover and is fixedly connected with the test cover. Optionally, the vacuum module further comprises a vacuum breaking valve, wherein the vacuum breaking valve i