Device for detecting natural gas

Abstract

The utility model discloses a device for detecting natural gas, which comprises a first gas inlet passage and a second gas inlet passage, the second gas inlet passage is used for introducing air to dilute detection gas, and a first gas storage tank is arranged at the exhaust end of the first gas inlet passage and the exhaust end of the second gas inlet passage. One exhaust end of the first gas storage tank is provided with a detection passage, the other exhaust end of the first gas storage tank is provided with a manual throttle valve, a second gas storage tank is arranged between the exhaust end of the manual throttle valve and the exhaust end of the detection passage, and the exhaust end of the second gas storage tank is provided with an exhaust passage. The detection device is provided with the first air inlet passage and the second air inlet passage, and the second air inlet passage is used for introducing air to dilute the detected gas, so that the detected gas can be diluted under the operation condition, the concentration of the detected gas is prevented from being too high, the device can be well detected, and the detection efficiency is improved. And meanwhile, the detection accuracy is ensured.

Description

Technical Field

[0001] The utility model relates to the field of energy monitoring, in particular to a device for detecting natural gas. Background Art

[0002] In the process of urban gas leak inspection, a natural gas detection device is needed to detect the safe operation or leakage of natural gas. The existing natural gas detection device directly checks the entry of the gas to be detected. If the concentration of the gas to be detected is too high, there will be safety hazards during the detection. Utility Model Content

[0003] The purpose of the utility model is to provide a device for detecting natural gas to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a device for detecting natural gas, comprising a first air intake passage and a second air intake passage, the first air intake passage is used for the transportation of detection gas, the second air intake passage is used for introducing air to dilute the detection gas, the exhaust ends of the first air intake passage and the second air intake passage are provided with a first gas storage tank, one of the exhaust ends of the first gas storage tank is provided with a detection passage for detecting gas temperature and concentration, the other exhaust end of the first gas storage tank is provided with a manual throttle, a second gas storage tank is provided between the discharge end of the manual throttle and the discharge end of the detection passage, and the discharge end of the second gas storage tank is provided with an exhaust passage.

[0005] Preferably, the first air intake passage comprises a detection air inlet, an exhaust end of the detection air inlet is provided with a first filter, and a discharge end of the first filter is communicated with an air intake end of the first air storage tank.

[0006] Preferably, the second air intake passage includes an air inlet, the exhaust end of the air inlet is provided with a second filter, the discharge end of the second filter is provided with a miniature vacuum pump, the discharge end of the miniature vacuum pump is provided with a gas solenoid valve, the exhaust end of the gas solenoid valve is provided with a first gas one-way valve, and the exhaust end of the first gas one-way valve is connected to the air intake end of the first gas storage tank.

[0007] Preferably, the detection path includes:

[0008] A PTFE filter, wherein the air inlet end of the PTFE filter is connected to the exhaust end of the first air storage tank, the exhaust end of the PTFE filter is provided with a gas humidifier, and the exhaust end of the gas humidifier is provided with a second gas one-way valve;

[0009] A detection unit, wherein the detection unit is arranged at the exhaust end of the second gas one-way valve;

[0010] A laser gas pool, wherein the laser gas pool is connected to the discharge end of the detection unit, the exhaust end of the laser gas pool is provided with a first three-way connector for connecting to the detection unit, the discharge end of the first three-way connector is provided with a second three-way connector, and the manual throttle exhausts to the second gas storage tank through the second three-way connector.

[0011] Preferably, the detection unit includes a temperature and humidity sensor, one end of the temperature and humidity sensor is interconnected with the exhaust end of the second gas one-way valve, the other end of the temperature and humidity sensor is provided with an infrared sensor, and the end of the infrared sensor away from the temperature and humidity sensor is provided with an electromagnetic three-way valve, and the two discharge ends of the electromagnetic three-way valve are respectively interconnected with the air inlet end of the laser gas pool and the air inlet end of the first three-way connector.

[0012] Preferably, the exhaust passage includes a vacuum pump body, the air inlet end of the vacuum pump body is connected to the exhaust end of the second air storage tank, the exhaust end of the vacuum pump body is provided with a pressure sensor, and the pressure sensor is provided with an exhaust port at one end away from the vacuum pump body.

[0013] Technical effects and advantages of the utility model:

[0014] The detection device of the utility model is provided with a first air intake passage and a second air intake passage, wherein the second air intake passage is used to let in air to dilute the detection gas. Under such operating conditions, the detection gas can be diluted, avoiding excessive concentration of the detection gas, so that the device can obtain good detection while ensuring the accuracy of the detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is the structural connection principle diagram of the utility model.

[0016] In the figure: 1. air inlet; 2. first filter; 3. miniature vacuum pump; 4. gas solenoid valve; 5. first gas one-way valve; 6. detection gas inlet; 7. second filter; 8. first gas storage tank; 9. PTFE filter; 10. gas humidifier; 11. second gas one-way valve; 12. temperature and humidity sensor; 13. infrared sensor; 14. solenoid three-way valve; 15. laser gas pool; 16. first three-way connector; 17. manual throttle; 18. second three-way connector; 19. second gas storage tank; 20. vacuum pump body; 21. pressure sensor; 22. exhaust port. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0018] The utility model provides Figure 1 The device shown is for detecting natural gas, comprising a first air intake passage and a second air intake passage, wherein the first air intake passage is used for conveying the detection gas, and the second air intake passage is used for introducing air to dilute the detection gas, and a first air storage tank 8 is provided at the exhaust ends of the first air intake passage and the second air intake passage.

[0019] Specifically, the first air intake passage includes a detection air inlet 1 , an exhaust end of the detection air inlet 1 is provided with a first filter 2 , and a discharge end of the first filter 2 is connected to an air intake end of the first air storage tank 8 .

[0020] Specifically, the second air intake passage includes an air inlet 3, the exhaust end of the air inlet 3 is provided with a second filter 4, the discharge end of the second filter 4 is provided with a micro vacuum pump 5, the discharge end of the micro vacuum pump 5 is provided with a gas solenoid valve 6, the exhaust end of the gas solenoid valve 6 is provided with a first gas one-way valve 7, and the exhaust end of the first gas one-way valve 7 is connected to the intake end of the first gas storage tank 8.

[0021] It should be noted that the first filter 2 and the second filter 4 used in this solution are of the same model, both of which are 4.6mm filters. A miniature vacuum pump 5 is used to pump air. Since the gas to be detected is mostly in a pressurized state, there is no need to set up a pump body for pumping. The gas solenoid valve 6 is a device for controlling the flow of gas. It uses the electromagnetic principle to achieve the regulation of gas flow. These valves are usually composed of a controllable electromagnetic coil and a movable valve core. When current passes through the electromagnetic coil, the generated magnetic field will cause the valve core to move, thereby changing the gas flow path and achieving control of the gas flow.

[0022] One of the exhaust ends of the first gas storage tank 8 is provided with a detection passage for detecting the gas temperature and concentration, and the other exhaust end of the first gas storage tank 8 is provided with a manual throttle valve 17. The intake volume is adjusted by the design of the manual throttle valve 17. A second gas storage tank 19 is provided between the exhaust end of the manual throttle valve 17 and the exhaust end of the detection passage.

[0023] Specifically, the detection pathway includes:

[0024] A PTFE filter 9, the air inlet end of the PTFE filter 9 and the exhaust end of the first air storage tank 8 are mutually connected, a gas humidifier 10 is provided at the exhaust end of the PTFE filter 9, and a second gas one-way valve 11 is provided at the exhaust end of the gas humidifier 10;

[0025] It should be noted that the PTFE filter 9 generally refers to a filter using polytetrafluoroethylene as a filter material. PTFE is an inert, corrosion-resistant material with good chemical stability and high temperature resistance.

[0026] A detection unit, which is arranged at the exhaust end of the second gas one-way valve 11;

[0027] Furthermore, the detection unit includes a temperature and humidity sensor 12, one end of which is interconnected with the exhaust end of the second gas one-way valve 11, and the other end of the temperature and humidity sensor 12 is provided with an infrared sensor 13. The end of the infrared sensor 13 away from the temperature and humidity sensor 12 is provided with an electromagnetic three-way valve 14, and two discharge ends of the electromagnetic three-way valve 14 are respectively interconnected with the air inlet end of the laser gas pool 15 and the air inlet end of the first three-way connector 16.

[0028] It should be noted that the infrared sensor 13 of this scheme is an NDIR type infrared sensor 13. Through the design of this structure, the design of the infrared sensor 13 can detect whether the regulated gas passes through the TDLAS sensor gas path. It can detect methane, propane, carbon dioxide and temperature, and determine whether the TDLAS gas path is open by the detected methane concentration.

[0029] The laser gas pool 15 is connected to the discharge end of the detection unit. The exhaust end of the laser gas pool 15 is provided with a first three-way connector 16 for connecting the detection unit. The discharge end of the first three-way connector 16 is provided with a second three-way connector 18, and the manual throttle valve 17 exhausts air to the second gas storage tank 19 through the second three-way connector 18.

[0030] It should be noted that the laser gas cell 15 uses a TDLAS laser gas chamber, which can detect methane and ethane, thereby performing low-range accurate detection of methane and detection of ethane.

[0031] An exhaust passage is provided at the discharge end of the second air storage tank 19, and the exhaust passage includes a vacuum pump body 20. The air inlet end of the vacuum pump body 20 and the exhaust end of the second air storage tank 19 are connected to each other. A pressure sensor 21 is provided at the exhaust end of the vacuum pump body 20. The pressure sensor 21 is used to determine whether the air path is blocked. An exhaust port 22 is provided at the end of the pressure sensor 21 away from the vacuum pump body 20.

[0032] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A device for detecting natural gas, characterized in that: The invention comprises a first air intake passage and a second air intake passage, wherein the first air intake passage is used for conveying detection gas, and the second air intake passage is used for introducing air to dilute the detection gas, and the exhaust ends of the first air intake passage and the second air intake passage are provided with a first air storage tank (8), one of the exhaust ends of the first air storage tank (8) is provided with a detection passage for detecting gas temperature and concentration, the other exhaust end of the first air storage tank (8) is provided with a manual throttle valve (17), a second air storage tank (19) is provided between the exhaust end of the manual throttle valve (17) and the exhaust end of the detection passage, and the exhaust end of the second air storage tank (19) is provided with an exhaust passage.

2. A device for detecting natural gas according to claim 1, characterized in that: The first air intake passage comprises a detection air inlet (1), the exhaust end of the detection air inlet (1) is provided with a first filter (2), and the exhaust end of the first filter (2) is connected to the intake end of the first air storage tank (8).

3. A device for detecting natural gas according to claim 1, characterized in that: The second air intake passage comprises an air inlet (3), the exhaust end of the air inlet (3) is provided with a second filter (4), the discharge end of the second filter (4) is provided with a micro vacuum pump (5), the discharge end of the micro vacuum pump (5) is provided with a gas solenoid valve (6), the exhaust end of the gas solenoid valve (6) is provided with a first gas one-way valve (7), and the exhaust end of the first gas one-way valve (7) is connected to the intake end of the first gas storage tank (8).

4. A device for detecting natural gas according to claim 1, characterized in that: The detection path includes: A PTFE filter (9), wherein the air inlet end of the PTFE filter (9) and the air outlet end of the first air storage tank (8) are mutually connected, the discharge end of the PTFE filter (9) is provided with a gas humidifier (10), and the discharge end of the gas humidifier (10) is provided with a second gas one-way valve (11); A detection unit, the detection unit being arranged at the exhaust end of the second gas one-way valve (11); A laser gas pool (15), the laser gas pool (15) is connected to the discharge end of the detection unit, the exhaust end of the laser gas pool (15) is provided with a first three-way connector (16) for connecting to the detection unit, the exhaust end of the first three-way connector (16) is provided with a second three-way connector (18), and the manual throttle (17) exhausts air to a second gas storage tank (19) through the second three-way connector (18).

5. A device for detecting natural gas according to claim 4, characterized in that: The detection unit comprises a temperature and humidity sensor (12), one end of the temperature and humidity sensor (12) is mutually connected with the exhaust end of the second gas one-way valve (11), the other end of the temperature and humidity sensor (12) is provided with an infrared sensor (13), the end of the infrared sensor (13) away from the temperature and humidity sensor (12) is provided with an electromagnetic three-way valve (14), and the two exhaust ends of the electromagnetic three-way valve (14) are mutually connected with the air inlet end of the laser gas pool (15) and the air inlet end of the first three-way connector (16), respectively.

6. The device for detecting natural gas according to claim 1, characterized in that: The exhaust passage comprises a vacuum pump body (20), an air inlet end of the vacuum pump body (20) and an exhaust end of the second air storage tank (19) are in communication with each other, a pressure sensor (21) is provided at the exhaust end of the vacuum pump body (20), and an exhaust port (22) is provided at one end of the pressure sensor (21) away from the vacuum pump body (20).

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