A laser gas detection device

Abstract

The application 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, the bottom shell is internally provided with a gas sensor, a micro air pump is arranged in the bottom shell, and the upper cover is provided with a sensing hole corresponding to the part of the gas sensor; the device further comprises a drainage pipe and a gas storage part for collecting gas, wherein the exhaust end of the drainage pipe faces the gas sensor and is located between the sensing hole and the gas sensor; the gas storage part is slidingly arranged on the top of the upper cover and has a first position and a second position; in the laser gas detection device, the upper cover and the drainage pipe are arranged, so that when the gas detection is carried out by using the diffusion structure, the gas pumped by the sliding arm can be discharged to the surroundings of the gas sensor through the drainage pipe, the flow rate of the gas around the gas sensor is increased by using the micro air pump, the pumping structure and the diffusion structure are cooperatively used, and the detection efficiency is further improved.

Description

TECHNICAL FIELD

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

[0002] The gas detector is an instrument and meter detection tool for detecting gas leakage concentration. It mainly uses gas sensors to detect the types of gases in the environment and the composition and content of the detected gases. The gas detector includes a pump suction type gas detector and a diffusion type gas detector. The diffusion type detector allows the gas to flow naturally into the detector, and the gas contacts the sensor inside the detector for detection. The pump suction type detector is provided with a small air pump on the detector, and the gas can quickly enter the detector through the air pump and contact the sensor for detection. The pump suction type gas detector can be used for remote measurement in dangerous areas to ensure the safety of the maintenance and detection personnel.

[0003] To meet the diversified collection needs, the current detector usually integrates the diffusion structure and the pump suction structure together. For example, the Chinese patent with publication number CN216160549U discloses a diffusion type and pump suction type integrated gas detector. However, the inventors found that this detector has the following problems after using it for a period of time.

[0004] Since the diffusion structure and the pump suction structure of the detector are independently operated, the diffusion structure and the pump suction structure cannot work cooperatively, so it is difficult to improve the detection efficiency through the pump suction structure when the surrounding gas flowability is poor. SUMMARY

[0005] The present application aims to provide a laser gas detection device which uses the gas delivered by the micro air pump through the flow guide pipe to accelerate the gas flow rate around the sensing hole, thereby solving the problem in the background art that the diffusion structure and the pump suction structure of the detector are independently operated and it is difficult to improve the detection efficiency through the pump suction structure.

[0006] To achieve the above-mentioned purpose, the laser gas detection device includes a bottom shell and an upper cover. The bottom shell is internally provided with a gas sensor. The bottom shell is internally provided with a micro air pump. The upper cover is provided with a sensing hole corresponding to the position of the gas sensor.

[0007] It also includes a flow guide pipe and a gas storage member for collecting gas. The exhaust end of the flow guide pipe faces the gas sensor and is located between the sensing hole and the gas sensor.

[0008] The gas storage member is slidingly arranged on the top of the upper cover and has a first position and a second position.

[0009] The gas storage member is in communication with the micro air pump and the drainage pipe when in the first position, and is used to guide the external gas into the drainage pipe, so that the flow rate of the gas in the drainage pipe is greater than the flow rate of the external gas under the action of the micro air pump, and a low pressure area is formed around the exhaust end of the drainage pipe.

[0010] The gas storage member is in communication with the micro air pump and the sensing hole when in the second position, and is used to guide the external gas to the sensing hole.

[0011] In the above technical solution, the drainage pipe arranged towards the gas sensor can discharge the gas generated by the micro air pump, and change the flow rate of the gas around the gas sensor during the discharging process. When the flow rate of the surrounding gas is slow, the drainage pipe can accelerate the speed of the gas flowing towards the gas sensor.

[0012] On this basis, the top of the upper cover is provided with a gas inlet and a gas outlet penetrating through, wherein the bottom of the gas inlet is in communication with the exhaust end of the micro air pump, and the bottom of the gas outlet is in communication with the gas inlet end of the drainage pipe; the gas storage member includes a cover slidingly arranged on the top of the upper cover, and the bottom of the cover is provided with a groove in communication with the gas inlet and the gas outlet. Specifically, the total sliding stroke of the gas storage member is less than the length of the gas storage member, at this time, the gas storage member partially overlaps when sliding to the corresponding position, and by arranging the gas inlet and the gas outlet in the overlapping area, the groove can be in communication with the gas inlet and the gas outlet.

[0013] On this basis, the gas conveying flow rate of the drainage pipe is less than the gas conveying flow rate of the micro air pump, and a deformable gas storage cavity is arranged in the groove of the cover, and the gas storage cavity stores gas in a deformed manner, so that the micro air pump is in an intermittent operation state.

[0014] In this technical solution, the structure of the deformable gas storage cavity is preferably an elastic plate, the elastic plate is arranged in the groove of the cover, and the outer edge of the elastic plate is attached to the inner wall of the groove, at this time, the gas entering the lower part of the elastic plate can make the elastic plate expand and deform to store more gas.

[0015] In another technical solution, an electromagnetic valve is arranged between the gas outlet and the drainage pipe, a one-way valve is arranged in the gas inlet, the gas storage cavity is used to pre-store gas without the measured component, and the working state of the test gas sensor is used.

[0016] In this technical solution, the electromagnetic valve and the one-way valve cooperate to seal the gas storage cavity, at this time, the gas storage cavity is used to pre-store gas without the measured component, when it is necessary to test the working state of the gas sensor, the gas storage cavity is pushed to the sensing hole, the gas without the measured component flows to the gas sensor, and then the working state of the gas sensor can be observed.

[0017] Compared with the prior art, the beneficial effects of the present application are:

[0018] 1. The laser gas detection device, by setting the cover and the drainage pipe, can discharge the gas pumped by the sliding arm to the surroundings of the gas sensor through the drainage pipe when using the diffusion structure for gas detection, so as to improve the flow rate of the gas around the gas sensor by using the micro air pump, realize the cooperation of the pumping structure and the diffusion structure, and further improve the detection efficiency.

[0019] 2. The laser gas detection device, the gas storage part is arranged, which can realize the working switching between the pumping structure and the diffusion structure, and can realize the pre-storage of clean gas, and the pre-stored gas can be released to the gas sensor through the sliding gas storage part, so as to realize the test of the working state of the gas sensor. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 It is the overall structure schematic diagram of the present application;

[0021] Figure 2 It is the internal structure schematic diagram of the shell of the present application;

[0022] Figure 3 It is the structure schematic diagram of the drainage pipe of the present application;

[0023] Figure 4 It is the structure schematic diagram of the gas storage part of the present application;

[0024] Figure 5 It is the working state schematic diagram of the drainage pipe of the present application;

[0025] Figure 6 It is the working state schematic diagram of the gas storage part of the present application;

[0026] Figure 7 It is the structure schematic diagram of the one-way valve of the present application.

[0027] The meanings of various signs in the figure are as follows:

[0028] 100, shell; 110, bottom shell; 111, circuit board; 112, gas sensor; 113, micro air pump; 114, air inlet pipe; 115, exhaust pipe; 120, cover; 121, sensing hole; 122, display screen; 123, air inlet; 124, air outlet; 125, drainage ring; 130, gas storage part; 131, elastic plate; 132, cover; 133, sliding arm; 134, gas storage cavity; 140, drainage pipe; 141, electromagnetic valve; 142, one-way valve. DETAILED DESCRIPTION

[0029] Clearly, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0030] In view of the problem that the diffusion structure and the pumping structure cannot work together, the present application provides a laser gas detection device, which optimizes the pumping structure and sets a drainage pipe 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.

[0031] As shown in Figure 1 The gas detection device includes a shell 100, which includes a bottom shell 110 and an upper cover 120. The bottom shell 110 and the upper cover 120 can be connected by clamping, threading, etc. The inside of the bottom shell 110 is provided with a circuit board 111, which is connected with a gas sensor 112 and a display screen 122. The gas sensor 112 detects the concentration of gas components (such as methane) by laser, and the data obtained after detection is processed by the circuit board 111 and output to the display screen 122, so as to facilitate the staff to 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 faces the staff during use, so as to facilitate the staff to view. Next, the pumping structure and the diffusion structure are described in detail:

[0032] The pumping structure includes a micro air pump 113 installed in the bottom shell 110, and the air inlet end of the micro air pump 113 is connected with an air inlet pipe 114, and the air outlet end is connected with an air outlet pipe 115. The air inlet pipe 114 penetrates one end of the bottom shell 110, and is used to connect with external equipment for remote measurement.

[0033] The diffusion structure is mainly composed of a sensing hole 121. The sensing hole 121 is arranged at the position corresponding to the gas sensor 112 on the upper cover 120. In this way, the gas in the external environment can quickly contact the gas sensor 112 after passing through the sensing hole 121, so that the gas sensor 112 detects the concentration of gas components.

[0034] In the above, the gas sensor 112 is arranged at one end of the circuit board 111, and the corresponding sensing hole 121 is located at one end of the upper cover 120. At the same time, the display screen 122 is arranged at the other end of the upper cover 120. In this way, a blank area is formed between the display screen 122 and the sensing hole 121 to provide installation space for the subsequent gas storage member 130.

[0035] The gas detection device further comprises a flow guide pipe 140 and a gas storage member 130 for collecting the gas, wherein the exhaust end of the flow guide pipe 140 is directed towards the gas sensor 112 and is located between the sensing hole 121 and the gas sensor 112; the gas storage member 130 is slidingly arranged on the top of the upper cover 120 (i.e. the blank area), as shown in Figure 3 The gas storage member 130 (in particular, the cover 132 to be described below) has a first position L1 and a second position L2, wherein when the gas storage member 130 is in the first position L1, it is in communication with the exhaust pipe 115 and the flow guide pipe 140, for guiding the gas in the exhaust pipe 115 to the flow guide pipe 140, and the flow rate of the gas in the flow guide pipe 140 is greater than the flow rate of the external gas under the action of the micro-pump 113, so as to form a low pressure area around the exhaust end of the flow guide pipe 140 and improve the speed of the gas flowing to the gas sensor 112; when the gas storage member 130 is in the second position L2, it is in communication with the exhaust pipe 115 and the sensing hole 121, for guiding the gas in the exhaust pipe 115 to the sensing hole 121.

[0036] In the above, as shown in Figure 3 To improve the efficiency of guiding the gas flow, the present application further provides a flow guide ring 125 arranged on the inner wall of the top of the upper cover 120, and the flow guide ring 125 is located at the outer periphery of the sensing hole 121, and then the exhaust end of the flow guide pipe 140 penetrates into the flow guide ring 125. In this way, the low pressure area formed around the exhaust end of the flow guide pipe 140 is located in the flow guide ring 125, and at this time most of the external gas can only enter the flow guide ring 125 through the sensing hole 121 and then contact the sensing hole 121.

[0037] As shown in Figure 3 The top of the upper cover 120 is provided with a gas inlet 123 and a gas outlet 124, wherein the bottom of the gas inlet 123 is in communication with the exhaust end of the exhaust pipe 115, and the bottom of the gas outlet 124 is in communication with the gas inlet end of the flow guide pipe 140. In addition, as shown in Figure 4 The gas storage member 130 comprises a cover 132 slidingly arranged on the top of the upper cover 120, and the bottom of the cover 132 is provided with a recess. Moreover, the total sliding stroke of the gas storage member 130 is less than the length of the gas storage member 130 itself, so that when the gas storage member 130 slides to the corresponding position, it will partially overlap (i.e. the cover 132 will partially overlap in the first position L1 and the second position L2), and the gas inlet 123 and the gas outlet 124 are located in the overlapping area. In this way, no matter where the cover 132 slides to, the recess inside the cover 132 is in communication with the gas inlet 123 and the gas outlet 124.

[0038] In implementation, first, sliding arms 133 adapted to the shape of the upper cover 120 are arranged on both sides of the cover 132, and the sliding arms 133 are provided with protrusions directed towards the side wall of the upper cover 120, and then as shown in Figure 2The side wall of the upper cover 120 is provided with a sliding groove corresponding to the protrusion, and the protrusion is slidingly arranged in the sliding groove, so as to realize the sliding connection between the gas storage member 130 and the upper cover 120. In addition, the bottom of the cover 132 is attached to the top of the upper cover 120 to prevent the gas in the groove from being discharged, and a rubber material or the like can be used for sealing.

[0039] Moreover, considering that the micro-pump 113 needs to work continuously to quickly discharge the gas from the drainage pipe 140 in the above structure. However, the continuous work of the micro-pump 113 will cause the power consumption of the detector to be too fast. Therefore, the present application optimizes and adjusts the pipe diameter of the drainage pipe 140 and the exhaust pipe 115, as shown in Figure 3 The pipe diameter of the adjusted drainage pipe 140 is smaller than that of the exhaust pipe 115. In addition, the groove in the cover 132 is provided with an elastic plate 131, the outer edge of the elastic plate 131 is attached to the inner wall of the groove, and the elastic plate 131 is located at the bottom of the groove, and the bottom of the elastic plate 131 and the top of the upper cover 120 form a gas storage cavity 134 (refer to Figure 5 ), and the elastic plate 131 is preferably made of rubber material. Through this design, the gas generated by the work of the micro-pump 113 enters the gas storage cavity 134 in the elastic plate 131, and since the exhaust speed of the drainage pipe 140 is slower than the intake speed of the gas storage cavity 134, the elastic plate 131 expands to collect the gas at this time, and when the elastic plate 131 expands to the corresponding position, the micro-pump 113 does not need to work continuously, thereby reducing the working time of the micro-pump 113 and reducing the power consumption.

[0040] It should be understood that the drainage pipe 140 only needs to increase the flow rate of the surrounding gas, and therefore does not need to be set to be relatively thick.

[0041] That is, by setting the upper cover 120 and the drainage pipe 140, the gas pumped by the sliding arm 133 can be discharged to the surrounding of the gas sensor 112 through the drainage pipe 140 when the diffusion structure is used for gas detection, so as to use the micro-pump 113 to increase the flow rate of the gas around the gas sensor 112, realize the cooperation of the pumping structure and the diffusion structure, and further improve the detection efficiency.

[0042] The specific principle of the gas detection device will be described in detail as follows:

[0043] When using the diffusion type for gas detection, as shown in Figure 5As shown, the micro-pump 113 pumps the ambient gas into the gas storage cavity 134 through the air inlet pipe 114 and the air outlet pipe 115, and stops working when the elastic plate 131 expands to the preset state. Subsequently, the gas in the gas storage cavity 134 is squeezed into the drainage pipe 140 under the action of the elasticity of the elastic plate 131, and then is discharged through the air outlet end of the drainage pipe 140. The flow rate of the gas in the drainage pipe 140 is increased due to the squeezing action of the elastic plate 131, and the pressure near the air outlet end of the drainage pipe 140 is reduced when the gas is discharged through the air outlet end of the drainage pipe 140. At this time, the ambient gas is sucked into the drainage ring 125 through the sensing hole 121, and then flows to the gas sensor 112, thereby accelerating the speed of the gas contacting the gas sensor 112.

[0044] In the gas detection using the pumping method, as shown in Figure 6 the push cover 132 is pushed to slide to the second position L2, at this time the micro-pump 113 continuously pumps the ambient gas into the gas storage cavity 134 through the air inlet pipe 114 and the air outlet pipe 115, and the gas in the gas storage cavity 134 enters the drainage ring 125 through the sensing hole 121, and then contacts the gas sensor 112.

[0045] Furthermore, in the embodiment shown in Figure 7 the electromagnetic valve 141 is arranged between the air outlet 124 and the drainage pipe 140, and the one-way valve 142 is arranged in the air inlet 123. In this way, by pre-storing the gas without the measured component in the gas storage cavity 134, the working state of the gas sensor 112 can be tested. Specifically as follows:

[0046] Taking the detection of methane as an example, the micro-pump 113 is started in the environment without methane, the micro-pump 113 pumps the clean gas (referring to the gas without methane) into the gas storage cavity 134 through the air inlet pipe 114 and the air outlet pipe 115, and the gas in the gas storage cavity 134 cannot be discharged from the one-way valve 142 after the micro-pump 113 stops. Then the electromagnetic valve 141 is controlled to close the drainage pipe 140, so that the gas in the gas storage cavity 134 cannot be discharged from the drainage pipe 140. At this time, the clean gas is temporarily stored in the gas storage cavity 134. When the gas sensor 112 detects methane, the instrument starts to alarm. If it is needed to test whether the gas sensor 112 is normal, referring to the lower part of Figure 7 , the push cover 132 is pushed to the second position L2, so that the clean gas in the gas storage cavity 134 flows into the gas sensor 112 through the sensing hole 121, and the clean gas fills around the gas sensor 112, thereby reducing the methane concentration around the gas sensor 112. In this way, if the instrument stops alarming, it indicates that the gas sensor 112 is normal, and if the instrument continues to alarm, it indicates that the gas sensor 112 is abnormal.

[0047] It is worth mentioning that since the alarm and stop alarm of the diffusion structure mainly rely on the flow rate of the gas, the above structure not only can test whether the gas sensor 112 works normally, but also can make the instrument stop alarming quickly. For example, after the instrument alarms, the staff know the position of the methane leakage, at this time, the cover 132 is pushed to the second position L2, the clean gas pre-stored in the gas storage cavity 134 flows directly to the gas sensor 112, so as to reduce the methane concentration around the gas sensor 112, at this time, the instrument stops alarming, and the interference caused by the sound is reduced.

[0048] Therefore, the gas storage member 130 arranged can not only realize the switching between the pumping structure and the diffusion structure, but also can realize the pre-storage of the clean gas, the pre-stored gas can be released to the gas sensor 112 by sliding the gas storage member 130, and the working state of the gas sensor 112 can be tested.

[0049] The basic principle, main features and advantages of the present application are shown and described above. It should be understood by those skilled in the art that the present application is not limited by the above examples, the above examples and descriptions in the specification are only preferred examples of the present application, and are not used to limit the present application, various changes and improvements of the present application can be made without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the present application. The scope of protection of the present application 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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