Laser gas detection device

Abstract

The invention relates to the technical field of gas detection, in particular to a laser gas detection device. The device comprises a bottom shell and an upper cover, a gas sensor is arranged in the bottom shell, a micro air pump is arranged in the bottom shell, and a sensing hole is formed in the position, corresponding to the gas sensor, of the upper cover; the device further comprises a drainage tube and a gas storage part used for collecting gas, and the exhaust end of the drainage tube faces the gas sensor and is located between the induction hole and the gas sensor. The gas storage part is arranged at the top of the upper cover in a sliding manner and is provided with a first position and a second position; according to the laser gas detection device, by arranging the upper cover and the drainage tube, gas pumped by the sliding arm can be discharged to the periphery of the gas sensor through the drainage tube when the diffusion structure is used for gas detection, so that the flow rate of the gas around the gas sensor is increased by utilizing the micro gas pump, and the pumping structure cooperates with the diffusion structure to work; and the detection efficiency is further improved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas detection, in particular to a laser gas detection device. Background Art

[0002] A gas detector is an instrument used to detect gas leaks and concentrations. It primarily utilizes gas sensors to detect the type of gas in the environment, as well as its composition and content. Gas detectors include pump-type and diffusion-type gas detectors. Diffusion-type detectors allow the natural flow of gas into the detector, where it is detected after contact with the internal sensor. Pump-type detectors utilize a small air pump, which rapidly draws gas into the detector for detection upon contact with the sensor. Pump-type gas detectors allow for remote measurement in hazardous areas, safeguarding the safety of inspectors.

[0003] To meet diverse collection needs, current detectors typically integrate a diffusion structure and a pumping structure. For example, Chinese patent publication number CN216160549U discloses a gas detector that integrates a diffusion and pumping mechanism. However, after using this detector for a period of time, the inventor discovered the following problems: Since the diffusion structure and pumping structure of the detector operate independently, the diffusion structure and the pumping structure cannot work together. Therefore, when the surrounding gas fluidity is poor, it is difficult to improve the detection efficiency through the pumping structure. Summary of the Invention

[0004] The object of the present invention is to provide a laser gas detection device, which utilizes the gas delivered by a micro air pump through a drainage tube to accelerate the gas flow rate around the sensing hole, thereby solving the problem raised in the above-mentioned background technology, namely, since the diffusion structure and pump suction structure of the detector operate independently, it is difficult to improve the detection efficiency through the pump suction structure.

[0005] To achieve the above-mentioned purpose, the laser gas detection device includes a bottom shell and an upper cover, wherein a gas sensor is provided inside the bottom shell, a micro air pump is provided inside the bottom shell, and a sensing hole is provided on the upper cover at a position corresponding to the gas sensor; It also includes a drainage tube and a gas storage member for collecting gas, wherein the exhaust end of the drainage tube faces the gas sensor and is located between the sensing hole and the gas sensor; The gas storage member is slidably arranged on the top of the upper cover and has a first position and a second position; When the air storage element is in the first position, it is connected to the micro air pump and the drainage tube, and is used to guide the external air into the drainage tube, so that the flow rate of the air in the drainage tube is greater than the flow rate of the external air under the action of the micro air pump, thereby forming a low-pressure area around the exhaust end of the drainage tube; When the gas storage element is in the second position, it is connected to the micro air pump and the sensing hole, and is used to guide external gas to the sensing hole.

[0006] In the above technical solution, the drainage tube, positioned toward the gas sensor, can discharge the gas generated by the micro-air pump. During this process, the flow rate difference changes the airflow velocity around the gas sensor. When the surrounding gas flow rate is slow, the drainage tube can speed up the flow of gas toward the gas sensor.

[0007] On this basis, the top of the upper cover is provided with an air inlet and an exhaust port extending therethrough, wherein the bottom of the air inlet is connected to the exhaust port of the micro air pump, and the bottom of the exhaust port is connected to the air inlet port of the drainage tube; the air storage member includes a cover slidably mounted on the top of the upper cover, and the bottom of the cover is provided with a groove connected to the air inlet and exhaust ports. Specifically, the total sliding stroke of the air storage member is less than its own length. In this case, the air storage member partially overlaps when sliding to the corresponding position. By arranging the air inlet and exhaust ports in the overlapping area, the groove can be connected to the air inlet and exhaust ports.

[0008] On this basis, the gas flow rate of the drainage tube is smaller than that of the micro air pump, and a deformable gas storage cavity is provided in the groove of the blocking cover. The gas storage cavity stores gas by deformation, so that the micro air pump is in an intermittent operation state.

[0009] In this technical solution, the structure of the deformable gas storage chamber is preferably an elastic plate, which is arranged in the groove of the blocking cover, and the outer edge of the elastic plate fits with the inner wall of the groove. At this time, when gas enters the lower part of the elastic plate, the elastic plate can expand and deform to store more gas.

[0010] In another technical solution, a solenoid valve is provided between the exhaust port and the drainage tube, a one-way valve is provided in the air inlet, and the gas storage chamber is used to pre-store gas that does not contain the measured component, and the working state of the test gas sensor is achieved by using gas that does not contain the measured component.

[0011] In this technical solution, the solenoid valve and the one-way valve can cooperate to seal the gas storage chamber. At this time, the gas storage chamber is used to pre-store gas that does not contain the measured component. When the working status of the gas sensor needs to be tested, the gas storage chamber is pushed to the sensing hole, and the gas that does not contain the measured component flows to the gas sensor. Then the working status of the gas sensor can be observed.

[0012] Compared with the prior art, the present invention has the following beneficial effects: 1. In this laser gas detection device, by providing an upper cover and a drainage tube, when using a diffusion structure for gas detection, the gas pumped by the sliding arm can be discharged to the vicinity of the gas sensor through the drainage tube, thereby utilizing a micro air pump to increase the flow rate of the gas around the gas sensor, realizing the coordinated operation of the pump suction structure and the diffusion structure, and further improving the detection efficiency.

[0013] 2. In the laser gas detection device, the gas storage component can not only realize the working switching between the pumping structure and the diffusion structure, but also realize the pre-storage of clean gas. By sliding the gas storage component, the pre-stored gas can be released to the gas sensor to realize the test of the working status of the gas sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 Schematic diagram of the internal structure of the housing of the present invention; Figure 3 Schematic diagram of the structure of the drainage tube of the present invention; Figure 4 It is a structural schematic diagram of the gas storage component of the present invention; Figure 5 This is a schematic diagram of the working state of the drainage tube of the present invention; Figure 6 This is a schematic diagram of the working state of the gas storage component of the present invention; Figure 7 It is a structural schematic diagram of the one-way valve of the present invention.

[0015] The meaning of each number in the figure is: 100. Shell; 110. Bottom shell; 111. Circuit board; 112. Gas sensor; 113. Micro air pump; 114. Air inlet pipe; 115. Exhaust pipe; 120. Upper cover; 121. Sensing hole; 122. Display screen; 123. Air inlet; 124. Exhaust port; 125. Drainage ring; 130. Air storage element; 131. Elastic plate; 132. Shielding cover; 133. Sliding arm; 134. Air storage chamber; 140. Drainage tube; 141. Solenoid valve; 142. One-way valve. DETAILED DESCRIPTION

[0016] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0017] In response to the problem that the diffusion structure and the pumping structure cannot work together, the present invention provides a laser gas detection device, which optimizes the pumping structure and sets a drainage tube 140 between the pumping structure and the diffusion structure to guide the gas, so that the gas can flow faster under the action of the pumping structure, thereby improving the detection efficiency.

[0018] like Figure 1 As shown, the gas detection device includes a shell 100, and the shell 100 includes a bottom shell 110 and an upper cover 120. The bottom shell 110 and the upper cover 120 can be connected by means of snap-fitting, threading, etc. A circuit board 111 is provided inside the bottom shell 110, and the circuit board 111 is connected to a gas sensor 112 and a display screen 122. The gas sensor 112 detects the concentration of gas components (such as methane) through laser, and the data obtained after the detection is processed by the circuit board 111 and output to the display screen 122, so that the staff can understand the gas concentration value through the display screen 122; the display screen 122 is installed on one side of the upper surface of the upper cover 120, and the upper surface of the upper cover 120 is facing the staff during use, so that the staff can check it. Next, the pumping structure and the diffusion structure are described in detail below: The pumping structure includes a micro air pump 113 installed in the bottom shell 110. The air inlet end of the micro air pump 113 is connected to the air inlet pipe 114, and the air outlet end is connected to the air outlet pipe 115. The air inlet pipe 114 runs through one end of the bottom shell 110 and is used to connect to an external device for remote measurement.

[0019] The diffusion structure is primarily composed of sensing holes 121. In the present invention, sensing holes 121 are positioned on the upper cover 120 at locations corresponding to the gas sensors 112. This allows ambient gas to quickly contact the gas sensors 112 after passing through the sensing holes 121, allowing the gas sensors 112 to detect gas concentrations.

[0020] In the above example, the gas sensor 112 is located at one end of the circuit board 111, and the corresponding sensing hole 121 is also located at one end of the upper cover 120. Meanwhile, the display screen 122 is located at the other end of the upper cover 120. This creates a blank area between the display screen 122 and the sensing hole 121, providing space for the subsequent installation of the gas storage member 130.

[0021] The gas detection device further includes a drainage tube 140 and a gas storage member 130 for collecting gas, wherein the exhaust end of the drainage tube 140 faces the gas sensor 112 and is located between the sensing hole 121 and the gas sensor 112; the gas storage member 130 is slidably arranged on the top of the upper cover 120 (i.e., the blank area), Figure 3The gas storage component 130 (specifically the blocking cover 132 to be described in detail below) has a first position L1 and a second position L2, wherein the gas storage component 130 is in the first position L1, connected to the exhaust pipe 115 and the drainage pipe 140, and is used to guide the gas in the exhaust pipe 115 to the drainage pipe 140. Under the action of the micro air pump 113, the flow rate of the gas in the drainage pipe 140 is greater than the flow rate of the external gas, thereby forming a low-pressure area around the exhaust end of the drainage pipe 140, thereby increasing the speed of the gas flowing to the gas sensor 112; when the gas storage component 130 is in the second position L2, it is connected to the exhaust pipe 115 and the sensing hole 121, and is used to guide the gas in the exhaust pipe 115 to the sensing hole 121.

[0022] In the above, if Figure 3 As shown, to improve the efficiency of guiding airflow, the present invention further provides a guide ring 125 on the top inner wall of the upper cover 120. The guide ring 125 is located around the sensing hole 121, and the exhaust end of the guide tube 140 is then inserted into the guide ring 125. This creates a low-pressure area around the exhaust end of the guide tube 140 within the guide ring 125, allowing most of the external air to enter the guide ring 125 through the sensing hole 121 and then contact the sensing hole 121.

[0023] like Figure 3 As shown, the top of the upper cover 120 is provided with an air inlet 123 and an exhaust port 124, wherein the bottom of the air inlet 123 is connected to the exhaust end of the exhaust pipe 115, and the bottom of the exhaust port 124 is connected to the air inlet end of the drainage pipe 140. Figure 4 As shown, the air storage member 130 includes a cover 132 that slides onto the top of the upper cover 120. A groove is defined at the bottom of the cover 132. Furthermore, the total sliding stroke of the air storage member 130 is less than its own length. Therefore, when the air storage member 130 slides to corresponding positions, they partially overlap (i.e., the cover 132 partially overlaps in the first position L1 and the second position L2), with the air inlet 123 and the air outlet 124 located in an overlapping area. Thus, regardless of the position to which the cover 132 slides, the groove within the cover 132 remains connected to the air inlet 123 and the air outlet 124.

[0024] During implementation, first, slide arms 133 that match the shape of the upper cover 120 are provided on both sides of the blocking cover 132. The slide arms 133 are provided with protrusions on the side walls facing the upper cover 120. Figure 2 The side wall of the upper cover 120 is provided with a sliding groove corresponding to the protrusion, and the protrusion is slidably set in the sliding groove, thereby realizing a sliding connection between the gas storage member 130 and the upper cover 120. In addition, the bottom of the blocking cover 132 is in contact with the top of the upper cover 120 to prevent the gas inside the groove from being discharged. Specifically, rubber or other materials can be used for sealing.

[0025] Moreover, considering that the micro air pump 113 in the above structure needs to work continuously to allow the gas to be quickly discharged from the drainage tube 140. However, the continuous operation of the micro air pump 113 will cause the power consumption of the detector to be too fast. To this end, the present invention optimizes and adjusts the diameters of the drainage tube 140 and the exhaust pipe 115, such as Figure 3 As shown, the diameter of the adjusted drainage pipe 140 is smaller than the diameter of the exhaust pipe 115. In addition, an elastic plate 131 is provided in the groove of the blocking cover 132. The outer edge of the elastic plate 131 is in contact with the inner wall of the groove, and the elastic plate 131 is located at the bottom of the groove. An air storage chamber 134 is formed between the bottom of the elastic plate 131 and the top of the upper cover 120 (refer to FIG. Figure 5 ), the elastic plate 131 is preferably made of rubber. With this design, the gas generated by the micro air pump 113 enters the air storage chamber 134 within the elastic plate 131 through the exhaust pipe 115. Because the exhaust speed of the drainage pipe 140 is slower than the intake speed of the air storage chamber 134, the elastic plate 131 expands to collect the gas. When the elastic plate 131 expands to the corresponding position, the micro air pump 113 no longer needs to operate continuously, thereby reducing the operating time of the micro air pump 113 and lowering power consumption.

[0026] It should be understood that the drainage tube 140 only needs to increase the flow rate of the surrounding gas, and therefore does not need to be set to be thicker.

[0027] That is to say, by setting the upper cover 120 and the drainage tube 140, when using the diffusion structure for gas detection, the gas pumped by the sliding arm 133 can be discharged to the vicinity of the gas sensor 112 through the drainage tube 140, thereby utilizing the micro air pump 113 to increase the flow rate of the gas around the gas sensor 112, realizing the coordinated work of the pump suction structure and the diffusion structure, and further improving the efficiency of detection.

[0028] The specific principle of the gas detection device is described in detail below: When using diffusion for gas detection, such as Figure 5 As shown, the micro air pump 113 pumps external air into the air storage chamber 134 through the air inlet pipe 114 and the exhaust pipe 115. When the elastic plate 131 expands to a preset state, the micro air pump 113 stops working. Subsequently, under the action of the elastic force of the elastic plate 131, the gas in the air storage chamber 134 will be squeezed into the drainage tube 140 and then discharged through the exhaust end of the drainage tube 140. Due to the squeezing effect of the elastic plate 131, the flow rate of the gas in the drainage tube 140 increases. When the gas is discharged through the exhaust end of the drainage tube 140, the pressure near the exhaust end of the drainage tube 140 decreases. At this time, the external air is sucked into the drainage ring 125 through the sensing hole 121 and then flows to the gas sensor 112, thereby accelerating the speed at which the gas contacts the gas sensor 112.

[0029] When using pump suction for gas detection, Figure 6 As shown, push the blocking cover 132 to slide to the second position L2. At this time, the micro air pump 113 continues to work, pumping the external gas into the gas storage chamber 134 through the air inlet pipe 114 and the exhaust pipe 115. The gas in the gas storage chamber 134 enters the drainage ring 125 through the sensing hole 121, and then contacts the gas sensor 112.

[0030] Not only that, in Figure 7 In the illustrated embodiment, a solenoid valve 141 is provided between the exhaust port 124 and the drainage tube 140, and a one-way valve 142 is provided within the air inlet 123. Thus, by pre-storing gas that does not contain the component to be measured within the gas storage chamber 134, the operating status of the gas sensor 112 can be tested. The details are as follows: Taking the detection of methane as an example, the micro air pump 113 is started in an environment without methane. The micro air pump 113 pumps clean gas (referring to gas without methane) into the gas storage chamber 134 through the air inlet pipe 114 and the exhaust pipe 115. When the micro air pump 113 stops, the gas in the gas storage chamber 134 cannot be discharged from the one-way valve 142. Then the solenoid valve 141 is controlled to close the drainage pipe 140 so that the gas in the gas storage chamber 134 cannot be discharged from the drainage pipe 140. At this time, the clean gas is temporarily stored in the gas storage chamber 134. When the gas sensor 112 detects methane, the instrument starts to alarm. If you need to test whether the gas sensor 112 is normal, refer to Figure 7 By moving the cover 132 to the second position L2, the clean gas in the gas storage chamber 134 flows through the sensing hole 121 to the gas sensor 112. This fills the area around the gas sensor 112 with clean gas, reducing the methane concentration around the gas sensor 112. If the instrument stops alarming, it indicates that the gas sensor 112 is functioning normally. If the instrument continues to alarm, it indicates that the gas sensor 112 is functioning abnormally.

[0031] It's worth noting that because the diffusion structure's alarm and deactivation primarily rely on gas flow velocity, this structure not only tests the proper functioning of gas sensor 112 but also quickly deactivates the instrument's alarm. For example, after the instrument alarm sounds, if the location of the methane leak is known to the staff, they can push cover 132 to the second position L2, allowing the clean gas stored in gas storage chamber 134 to flow directly to gas sensor 112, reducing the methane concentration around gas sensor 112. This stops the instrument alarm and reduces noise interference.

[0032] It can be seen that the set gas storage part 130 can not only realize the working switching between the pumping structure and the diffusion structure, but also realize the pre-storage of clean gas. By sliding the gas storage part 130, the pre-stored gas can be released to the gas sensor 112 to realize the testing of the working status of the gas sensor 112.

[0033] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely preferred examples of the present invention and are not intended to limit the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements fall within the scope of the present invention. The scope of protection claimed in the present invention is defined by the appended claims and their equivalents.

Claims

1. A laser gas detection device, comprising a bottom shell (110) and an upper cover (120), wherein a gas sensor (112) is provided inside the bottom shell (110), characterized in that: A micro air pump (113) is provided in the bottom shell (110), and a sensing hole (121) is provided in a portion of the upper cover (120) corresponding to the gas sensor (112); It also includes a drainage tube (140) and a gas storage member (130) for collecting gas, wherein the exhaust end of the drainage tube (140) faces the gas sensor (112) and is located between the sensing hole (121) and the gas sensor (112); The gas storage member (130) is slidably arranged on the top of the upper cover (120) and has a first position and a second position; When the gas storage member (130) is in the first position, it is in communication with the micro air pump (113) and the drainage tube (140), and is used to guide external gas into the drainage tube (140), so that the flow rate of the gas in the drainage tube (140) is greater than the flow rate of the external gas under the action of the micro air pump (113), thereby forming a low-pressure area around the exhaust end of the drainage tube (140); When the gas storage element (130) is in the second position, it is in communication with the micro air pump (113) and the sensing hole (121), and is used to guide external gas to the sensing hole (121).

2. The laser gas detection device according to claim 1, characterized in that: The top of the upper cover (120) is provided with an air inlet (123) and an air outlet (124) extending therethrough, wherein the bottom of the air inlet (123) is communicated with the exhaust end of the micro air pump (113), and the bottom of the air outlet (124) is communicated with the air inlet end of the drainage tube (140); The air storage member (130) comprises a blocking cover (132) slidably arranged on the top of the upper cover (120), and a groove communicating with the air inlet (123) and the air outlet (124) is provided at the bottom of the blocking cover (132).

3. The laser gas detection device according to claim 2, characterized in that: The total sliding stroke of the gas storage member (130) is less than its own length, so that the gas storage member (130) partially overlaps when sliding to a corresponding position, and the air inlet (123) and the air outlet (124) are in an overlapping area.

4. The laser gas detection device according to claim 2, characterized in that: The exhaust end of the micro air pump (113) is connected to the air inlet (123) via an exhaust pipe (115), and the air inlet end is connected to an air inlet pipe (114).

5. The laser gas detection device according to claim 1, characterized in that: A drainage ring (125) is provided at a portion of the upper cover (120) corresponding to the sensing hole (121), and the exhaust end of the drainage pipe (140) penetrates into the drainage ring (125).

6. The laser gas detection device according to claim 2, characterized in that: Sliding arms (133) adapted to the shape of the upper cover (120) are provided on both sides of the blocking cover (132), and the sliding arms (133) are slidably connected to the side walls of the upper cover (120).

7. The laser gas detection device according to claim 2, characterized in that: The bottom of the blocking cover (132) is slidably fitted with the top of the upper cover (120).

8. The laser gas detection device according to claim 2, characterized in that: The gas flow rate of the drainage tube (140) is smaller than the gas flow rate of the micro air pump (113), and a deformable gas storage cavity (134) is provided in the groove of the blocking cover (132). The gas storage cavity (134) stores gas by deformation, so that the micro air pump (113) is in an intermittent operation state.

9. The laser gas detection device according to claim 8, characterized in that: An elastic plate (131) is provided in the groove of the blocking cover (132), the outer edge of which is in contact with the inner wall of the groove. An air storage cavity (134) is formed between the bottom of the elastic plate (131) and the top of the upper cover (120).

10. The laser gas detection device according to claim 8, characterized in that: A solenoid valve (141) is provided between the exhaust port (124) and the drainage tube (140), a one-way valve (142) is provided in the air inlet (123), and the gas storage chamber (134) is used to pre-store gas that does not contain the component to be measured, and to test the working state of the gas sensor (112) using the gas that does not contain the component to be measured.

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