Suction type double-gas analysis leak detector and detection method thereof

Abstract

The suction type double-gas analysis leak detector comprises a first gas analysis chamber and a second gas analysis chamber which are independently arranged, the first gas analysis chamber and the second gas analysis chamber are connected with a vacuum pump, and a detection light source and a detector are arranged on the two sides of the first gas analysis chamber and the two sides of the second gas analysis chamber respectively. A gas inlet I of the gas analysis chamber I is connected with a gas conveying pipe I, a gas inlet II of the gas analysis chamber II is connected with a gas conveying pipe II, and a gas suction nozzle II and a gas suction nozzle I are respectively arranged on the gas conveying pipe II and the gas conveying pipe I in a front-back manner. When the concentrations of the gases sucked by the second suction nozzle and the first suction nozzle are consistent or basically close, the alarm signal is not sent out, and when the concentration of the gases sucked by the second suction nozzle at the front end is larger than that of the gases sucked by the first suction nozzle, the alarm signal of detecting a leakage point is sent out, namely, the gas leakage point exists near the second suction nozzle. And therefore, the position of the leakage point can be locked quickly, accurately and efficiently, and the leakage detection efficiency of the equipment can be greatly improved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas leakage detection, in particular to an inhalation-type dual-gas analysis leak detector and a detection method thereof. Background Art

[0002] Refrigerant leak detectors are mainly used to detect leaks in the operating pipelines and connection parts of refrigeration and heat exchange equipment. Specifically, the air suction nozzle of the leak detector is moved to the part to be tested, and the inhaled gas is transported to the gas analysis chamber. By setting detection light sources and detectors at both ends of the gas analysis chamber, spectral analysis is performed on the incoming gas to determine whether there is a gas leak, that is, to detect the refrigerant leakage problem of the detection equipment.

[0003] Most of the leak detectors on the market currently have a suction-type single-gas analysis chamber structure, that is, after the leak detector inhales the refrigerant gas, it issues a leakage alarm through spectral analysis to achieve the purpose of leak detection.

[0004] However, the above detection method has certain limitations. That is, when multiple test points are relatively concentrated, if a leak occurs at one of the test points, the leaked gas will spread to the vicinity of the detection area, so that when the suction nozzle of the leak detector approaches the leakage area but does not touch the actual leakage point, the leak detector will sound an alarm, and can only determine that there is a leak in the area, but cannot accurately lock the specific location of the leakage point. Summary of the Invention

[0005] The purpose of the present invention is to overcome the above-mentioned deficiencies in the prior art and to provide a suction-type dual-gas analysis leak detector and a detection method thereof.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A suction-type dual-gas analysis leak detector includes an independently arranged gas analysis chamber 1 and a gas analysis chamber 2, the gas outlet ends of the gas analysis chamber 1 and the gas analysis chamber 2 being connected to a vacuum pump, detection light sources and detectors are provided on both sides of the gas analysis chamber 1 and the gas analysis chamber 2, the gas inlet 1 of the gas analysis chamber 1 is connected to a gas pipe 1, the gas inlet 2 of the gas analysis chamber 2 is connected to a gas pipe 2, and the gas pipe 2 and the gas pipe 1 are respectively provided with a second suction nozzle and a first suction nozzle in front and behind.

[0008] Preferably, optical filter 1 is provided at both ends of the gas analysis chamber 1, and the detection light source and detector are provided on the outside of the optical filter 1.

[0009] Preferably, optical filters are provided at both ends of the second gas analysis chamber, and the detection light source and the detector are provided outside the second optical filter.

[0010] Preferably, the air delivery pipe 1 is provided with a filter 1 located between the air suction nozzle 1 and the air inlet 1.

[0011] Preferably, the second air delivery pipe is provided with a second filter located between the second air suction nozzle and the second air inlet.

[0012] Preferably, the gas outlet 1 of the gas analysis chamber 1 is connected to an exhaust pipe 1, the gas outlet 2 of the gas analysis chamber 2 is connected to an exhaust pipe 2, and the other ends of the exhaust pipe 1 and the exhaust pipe 2 are connected to a vacuum pump.

[0013] Preferably, a buffer gas tank is provided between the exhaust pipe 1, the exhaust pipe 2 and the vacuum pump.

[0014] The present invention also discloses a detection method of an inhalation-type dual-gas analysis leak detector, comprising the following steps:

[0015] a. Move the suction nozzles 2 and 1 to the test area. The suction nozzles 2 and 1 use vacuum pumps to transport the inhaled gas to the gas analysis chamber 2 and gas analysis chamber 1 respectively for spectral analysis.

[0016] b. When there is no gas leakage in the test area, the gas sucked in by the second and first suction nozzles is analyzed by the spectrum of the second and first gas analysis chambers. The detected concentrations of the two gases are close, and no alarm signal is issued.

[0017] c. When gas leakage occurs in the test area, that is, when the suction nozzle 2 and the suction nozzle 1 perform suction detection in a wider range of ambient gas area, since the concentration of the leaked gas in the ambient gas area is basically close, no alarm signal is issued;

[0018] d. As the suction nozzle 2 and the suction nozzle 1 are further moved for detection, until the front suction nozzle 2 moves to the gas leakage area, since the gas leakage area is closer to the leakage point, that is, the leakage gas concentration in the gas leakage area is higher than the leakage gas concentration in the ambient gas area, at this time, an alarm signal of leakage point detection is issued.

[0019] Preferably, in step c, after the second suction nozzle and the first suction nozzle perform suction detection on the ambient gas area, a gas leakage alarm signal is issued.

[0020] The beneficial effects of the present invention are:

[0021] 1. The gas sucked in by the front and rear suction nozzles 2 and 1 is tested independently in two ways. When the concentrations of the gases sucked in by suction nozzles 2 and 1 are the same or basically close, no alarm signal is issued. However, when the concentration of the gas sucked in by suction nozzle 2 at the front end is greater than that of the gas sucked in by suction nozzle 1, an alarm signal indicating a leak is detected is issued, indicating that there is a gas leak near suction nozzle 2. The leak point can then be located quickly, accurately and efficiently, thereby greatly improving the leak detection efficiency of the equipment and meeting the detection requirements of production lines with a fast production pace, such as assembly lines.

[0022] 2. By setting up two independent groups of suction nozzle 1 and gas analysis chamber 1 and suction nozzle 2 and gas analysis chamber 2, it is possible to simultaneously detect and analyze two gas paths, thereby more efficiently detecting gas leaks and locking leak points, thereby further improving detection efficiency. The two groups of detection are independent of each other and will not cause detection interference, making the test results more accurate and reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a structural schematic diagram of the present invention.

[0024] In the figure: gas supply pipe 1, air suction nozzle 11, filter 12, exhaust pipe 13, gas analysis chamber 2, air inlet 21, air outlet 22, optical filter 23, detection light source 3, detector 4, vacuum pump 5, buffer gas tank 51, gas supply pipe 2 6, air suction nozzle 2 61, filter 2 62, exhaust pipe 2 63, gas analysis chamber 2 7, air inlet 2 71, air outlet 2 72, optical filter 2 73, ambient gas area 8, leakage gas area 9. DETAILED DESCRIPTION

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0026] In the description of this specification, the directions or positional relationships indicated by the terms "up", "down", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0027] like Figure 1As shown, this embodiment discloses an inhalation-type dual-gas analysis leak detector, including independently arranged gas analysis chamber 1 2 and gas analysis chamber 2 7, the gas outlet ends of gas analysis chamber 1 2 and gas analysis chamber 2 7 are connected to a vacuum pump 5, specifically, the gas outlet 1 22 of gas analysis chamber 1 2 is connected to an exhaust pipe 13, and the gas outlet 2 72 of gas analysis chamber 2 7 is connected to an exhaust pipe 2 63, the other ends of the exhaust pipe 13 and the exhaust pipe 2 63 are connected in parallel and then the pipeline is connected to the vacuum pump 5, and a buffer gas tank 51 is provided between the exhaust pipe 13, the exhaust pipe 2 63 and the vacuum pump 5.

[0028] The air inlet 21 of the gas analysis chamber 2 is connected to a gas pipe 1, and the air inlet 71 of the gas analysis chamber 7 is connected to a gas pipe 6. The gas pipe 6 and the gas pipe 1 are respectively provided with an air suction nozzle 61 and an air suction nozzle 11 in front and behind, that is, one end of the gas pipe 1 is connected to the air inlet 21, and the other end of the gas pipe 1 is connected to the air suction nozzle 11. The gas pipe 1 is provided with a filter 12 located between the air suction nozzle 11 and the air inlet 21.

[0029] One end of the second air supply pipe 6 is connected to the second air inlet 71 , and the other end of the second air supply pipe 6 is connected to the second air suction nozzle 61 . The second air supply pipe 6 is provided with a second filter 62 located between the second air suction nozzle 61 and the second air inlet 71 .

[0030] The second suction nozzle 61 and the first suction nozzle 11 are arranged in an interlaced manner in front and back. The second suction nozzle 61 and the first suction nozzle 11 suck air through the vacuum pump 5 to respectively suck the gas at the corresponding location into the second gas analysis chamber 7 and the first gas analysis chamber 2.

[0031] Detection light sources 3 and detectors 4 are provided on both sides of the gas analysis chamber 1 2 and the gas analysis chamber 2 7. Filter 1 23 is provided at both ends of the gas analysis chamber 1 2, and the detection light source 3 and detector 4 are arranged on the outside of the filter 1 23. Filter 2 73 is provided at both ends of the gas analysis chamber 2 7, and the detection light source 3 and detector 4 are arranged on the outside of the filter 2 73.

[0032] The gas analysis chamber 2 7 and the gas analysis chamber 1 2 respectively perform spectral analysis on the inhaled gas to be detected. Specifically, the inhaled gas is independently detected in two ways through the front and rear arranged air suction nozzles 2 61 and air suction nozzle 1 11, and when the concentrations of the gases inhaled by the air suction nozzles 2 61 and air suction nozzle 1 11 are the same or basically close, no alarm signal is issued.

[0033] When the concentration of the gas inhaled by the front-end suction nozzle 2 61 is greater than the concentration of the gas inhaled by the suction nozzle 1 11, an alarm signal indicating that a leak is detected is issued. Specifically, when the suction nozzle 2 61 moves close to the gas leakage point, the leakage concentration at the gas leakage point is large, and there is a concentration difference between the gas concentration detected by the gas analysis chamber 2 7 and the gas concentration detected by the gas analysis chamber 1 2. At this time, an alarm signal is issued, and there is a gas leakage point near the suction nozzle 2 61. That is, this embodiment can quickly, accurately and efficiently lock the leakage point position, thereby greatly improving the leak detection efficiency of the equipment.

[0034] By setting up two independent groups of suction nozzle 11, gas analysis chamber 1 2 and suction nozzle 2 61, gas analysis chamber 2 7, it is possible to simultaneously detect and analyze two gas paths, thereby more efficiently detecting gas leaks and locking leak points, thereby further improving the detection efficiency and meeting the detection requirements of production lines with a fast production pace, such as assembly lines. The two groups of detection are independent of each other and will not cause detection interference, making the detection results more accurate and reliable.

[0035] In this embodiment, the air suction nozzle 1 11 and the air suction nozzle 2 61 are integrated and installed on the same handle, and the air suction nozzle 2 61 is arranged at the front end of the handle, while the air suction nozzle 1 11 is arranged slightly behind the front end of the handle.

[0036] This embodiment also discloses a detection method of an inhalation-type dual-gas analysis leak detector, comprising the following steps:

[0037] a. Move the suction nozzle 2 61 and the suction nozzle 1 11 to the test area. The suction nozzle 2 61 and the suction nozzle 1 11 use the vacuum pump 5 to transport the sucked gas to the gas analysis chamber 2 7 and the gas analysis chamber 1 2 for spectral analysis;

[0038] b. When no gas leakage occurs in the test area, the gases sucked in by the second suction nozzle 61 and the first suction nozzle 11 are analyzed by the spectrum of the second gas analysis chamber 7 and the first gas analysis chamber 2. The detected concentrations of the two gases are close (which can also be understood as the detected leakage gas concentration index is zero), and no alarm signal is issued;

[0039] c. When a gas leak occurs in the test area, that is, when the second suction nozzle 61 and the first suction nozzle 11 perform suction detection in the wider ambient gas area 8, the concentration of the leaked gas in the ambient gas area 8 is basically the same, and thus no alarm signal is issued;

[0040] d. As the suction nozzle 2 61 and the suction nozzle 1 11 are further moved for detection, until the front suction nozzle 2 61 moves to the leaking gas area 9, since the leaking gas area 9 is closer to the leakage point, that is, the leakage gas concentration in the leaking gas area 9 is higher than the leakage gas concentration in the ambient gas area 8, at this time, an alarm signal of leakage point detection is issued.

[0041] Furthermore, in step c, after the second suction nozzle 61 and the first suction nozzle 11 perform suction detection on the ambient gas area 8, a gas leakage alarm signal can also be issued to issue a gas leakage detection alarm.

[0042] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. An inhalation-type dual-gas analysis leak detector, comprising a gas analysis chamber 1 (2) and a gas analysis chamber 2 (7) which are independently arranged, wherein the gas outlet ends of the gas analysis chamber 1 (2) and the gas analysis chamber 2 (7) are connected to a vacuum pump (5), characterized in that: Detection light sources (3) and detectors (4) are provided on both sides of the gas analysis chamber 1 (2) and the gas analysis chamber 2 (7). The gas inlet 1 (21) of the gas analysis chamber 1 (2) is connected to the gas supply pipe 1 (1), and the gas inlet 2 (71) of the gas analysis chamber 2 (7) is connected to the gas supply pipe 2 (6). The gas supply pipe 2 (6) and the gas supply pipe 1 (1) are provided with a second suction nozzle (61) and a first suction nozzle (11) in front and back, respectively.

2. The suction-type dual-gas analysis leak detector according to claim 1, characterized in that: Optical filter 1 (23) is provided at both ends of the gas analysis chamber 1 (2), and the detection light source (3) and the detector (4) are provided outside the optical filter 1 (23).

3. The suction-type dual-gas analysis leak detector according to claim 1, characterized in that: Optical filter 2 (73) is provided at both ends of the second gas analysis chamber (7), and the detection light source (3) and the detector (4) are provided outside the optical filter 2 (73).

4. The suction-type dual-gas analysis leak detector according to any one of claims 1 to 3, characterized in that: The air delivery pipe 1 (1) is provided with a filter 1 (12) located between the air suction nozzle 1 (11) and the air inlet 1 (21).

5. The suction-type dual-gas analysis leak detector according to any one of claims 1 to 3, characterized in that: The second air delivery pipe (6) is provided with a second filter (62) located between the second air suction nozzle (61) and the second air inlet (71).

6. The suction-type dual-gas analysis leak detector according to any one of claims 1 to 3, characterized in that: The gas outlet 1 (22) of the gas analysis chamber 1 (2) is connected to the exhaust pipe 1 (13), and the gas outlet 2 (72) of the gas analysis chamber 2 (7) is connected to the exhaust pipe 2 (63). The other ends of the exhaust pipe 1 (13) and the exhaust pipe 2 (63) are connected to the vacuum pump (5).

7. The suction-type dual-gas analysis leak detector according to claim 6, characterized in that: A buffer gas tank (51) is provided between the exhaust pipe 1 (13), the exhaust pipe 2 (63) and the vacuum pump (5).

8. A detection method for an inhalation-type dual-gas analysis leak detector, characterized in that: The following steps are involved: a. Move the suction nozzle 2 (61) and the suction nozzle 1 (11) provided at the front and rear to the test area, and the suction nozzle 2 (61) and the suction nozzle 1 (11) respectively transport the sucked gas to the gas analysis chamber 2 (7) and the gas analysis chamber 1 (2) through the vacuum pump (5) for spectral analysis; b. When there is no gas leakage in the test area, the gas sucked in by the second suction nozzle (61) and the first suction nozzle (11) is subjected to spectral analysis by the second gas analysis chamber (7) and the first gas analysis chamber (2). The detected concentrations of the two gases are close, and no alarm signal is issued; c. When a gas leak occurs in the area to be tested, that is, when the second suction nozzle (61) and the first suction nozzle (11) perform suction detection in the wider ambient gas area (8), since the concentration of the gas leaked in the ambient gas area (8) is basically close, no alarm signal is issued; d. As the suction nozzle 2 (61) and the suction nozzle 1 (11) are further moved for detection, until the front suction nozzle 2 (61) moves to the leaking gas area (9), since the leaking gas area (9) is closer to the leakage point, that is, the leakage gas concentration in the leaking gas area (9) is higher than the leakage gas concentration in the ambient gas area (8), at this time, an alarm signal indicating that a leakage point has been detected is issued.

9. The detection method of the suction-type dual-gas analysis leak detector according to claim 8, characterized in that: In step c, after the second suction nozzle (61) and the first suction nozzle (11) perform suction detection on the ambient gas area (8), a gas leakage alarm signal is issued.

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