Gas detection device

Abstract

The gas detection device comprises a shell, a first circuit board, a detection assembly and a cable, the shell is provided with a through hole and an inner cavity, the first circuit board and the detection assembly are both located in the inner cavity, the detection assembly is connected with the first circuit board, and the cable is electrically connected with the first circuit board. The cable is at least partially located in the through hole; a plane perpendicular to the height direction of the gas detection device is defined as a projection plane, and the projection plane is provided with a first straight line and a second straight line; the hole wall of the through hole has a first projection on the projection plane, and the first straight line extends along the length direction of the first projection; the second straight line extends along the width direction or the length direction of the gas detection device; and the first straight line is obliquely arranged at an acute included angle relative to the second straight line. The occupied area of the shell can be reduced.

Description

Technical Field

[0001] The present application relates to the field of sensor technology, and in particular to a gas detection device. Background Art

[0002] A gas detection sensor is a converter that converts the concentration of a certain gas into a corresponding electrical signal. Its main principle is that different gases have different absorption rates of infrared light. The detection probe can calculate the concentration of the target gas and other information by detecting different light intensities.

[0003] A gas detection device of the related art includes a housing, a light source, a cable, a detection probe, a shell part, and a first circuit board. The housing has an inner cavity, the shell part and the first circuit board are both located in the inner cavity, the shell part has a detection cavity, the light source and the detection probe are at least partially located in the detection cavity, and the detection probe is used to receive light from the light source. The housing has a first connecting hole, the first connecting hole is connected to the inner cavity, the housing part has a second connecting hole, the second connecting hole is connected to the inner cavity, the cable is electrically connected to the first circuit board, and the cable is at least partially located outside the housing. The housing has a through hole, the cable is at least partially located in the through hole, the inner cavity of the housing and the first circuit board are both rectangular, and the through hole is arranged parallel to the length direction or width direction of the housing.

[0004] In the related art, the through hole is arranged parallel to the length direction or the width direction of the shell. When the length of the through hole is kept unchanged and the shell needs to be confined within a rectangular boundary, it is easy to cause the gas detection device to partially exceed the predetermined rectangular boundary, and the shell occupies a large space. Therefore, how to reduce the space occupied by the shell has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] The gas detection device provided in the present application includes a shell, a first circuit board, a detection component and a cable, the shell has a through hole and an inner cavity, the first circuit board and the detection component are both located in the inner cavity, the detection component is connected to the first circuit board, the cable is electrically connected to the first circuit board, and the cable is at least partially located outside the shell; a plane perpendicular to the height direction of the gas detection device is defined as a projection plane, the projection plane has a first straight line and a second straight line; the hole wall of the through hole has a first projection on the projection plane, the first straight line extends along the length direction of the first projection; the second straight line extends along the width direction or the length direction of the gas detection device; the first straight line is inclined at an acute angle relative to the second straight line.

[0006] In the present application, the first straight line is inclined at an acute angle relative to the second straight line, that is, the through hole is inclined relative to the length direction or width direction of the shell. When the length of the through hole remains unchanged, the space occupied by the shell is small, which is conducive to the miniaturization of the gas detection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1 It is a three-dimensional schematic diagram of the gas detection device of the present application.

[0008] Figure 2 yes Figure 1 A three-dimensional cross-sectional schematic diagram is used to show the structure inside the shell.

[0009] Figure 3 yes Figure 1 Schematic diagram of the explosion.

[0010] Figure 4 yes Figure 1 A three-dimensional schematic diagram of the second shell hidden in FIG.

[0011] Figure 5 yes Figure 4 A three-dimensional schematic diagram of the other side.

[0012] Figure 6 yes Figure 4 A top view schematic diagram is used to show the first installation space, the second installation space, the third installation space and the fourth installation space.

[0013] Figure 7 yes Figure 6 Schematic diagram of the projection on the projection plane.

[0014] Figure 8 yes Figure 4 Schematic diagram of the explosion.

[0015] Fig. 9 yes Figure 4 An exploded schematic diagram of the first shell and the first circuit board is used to show the interference part.

[0016] Fig.10 yes Figure 2 Schematic diagram of the structure of the second shell.

[0017] Fig.11 It is an exploded schematic diagram of the shell part, the blocking part, the waterproof breathable membrane and the supporting part.

[0018] Fig.12 yes Fig.11 A schematic three-dimensional cutaway view of the middle shell portion.

[0019] Fig.13 yes Fig.11 Schematic cross-sectional view of the middle blocking part. DETAILED DESCRIPTION

[0020] The exemplary embodiments of the present application are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features of the following embodiments and implementations can be combined with each other.

[0021] As environmentally friendly refrigerants replace traditional refrigerants, the industry has found that some environmentally friendly refrigerants are flammable compared to traditional refrigerants, which poses a safety hazard to air-conditioning systems. Therefore, it is necessary to use a gas concentration detection device to detect whether the refrigerant is leaking, so that the air-conditioning control system can shut down and alarm in time to reduce the safety hazards caused by environmentally friendly refrigerants.

[0022] like Figures 1 to 13 The figure shows a gas detection device in accordance with the present application, which includes: a shell 1, a first circuit board 2, a detection component 21 and a cable 22, the shell 1 has a through hole 13 and an inner cavity 14, the through hole 13 is connected to the outside of the gas detection device, the through hole 13 is connected to the inner cavity 14, the first circuit board 2 and the detection component 21 are both located in the inner cavity 14, the detection component 21 is connected to the first circuit board 2, the cable 22 is connected to the first circuit board 2, and the cable 22 is at least partially located in the through hole 13.

[0023] Reference Figure 1 as well as Figure 7 The gas detection device has a vertical direction Z, which is parallel to the height direction of the gas detection device. A plane perpendicular to the vertical direction Z is defined as a projection plane 3, and the projection plane 3 has a first straight line X1 and a second straight line X2.

[0024] Reference Figure 1 as well as Figure 7 The hole wall of the through hole 13 has a first projection S1 on the projection plane 3, and the shell 1 has a second projection S2 on the projection plane 3. Specifically, the first projection S1 is the orthographic projection of the hole wall of the through hole 13 on the projection plane 3, and the second projection S2 is the orthographic projection of the shell 1 on the projection plane 3.

[0025] Reference Figure 1 as well as Figure 7 The first straight line X1 extends along the length direction of the first projection S1, and the second straight line X2 extends along the length direction or the width direction of the gas detection device. The first straight line X1 is inclined at an acute angle relative to the second straight line X2.

[0026] The first straight line X1 is inclined at an acute angle relative to the second straight line X2, which can reduce the footprint of the housing 1 when the length of the through hole 13 remains unchanged.

[0027] In some embodiments, reference Figure 4 as well as Figure 5The shell 1 has an inner side wall 15, which is arranged around the first circuit board 2. The inner side wall 15 includes a first side wall 151, a second side wall 152, a third side wall 153, a fourth side wall 154, a first corner wall 155, a second corner wall 156, a third corner wall 157 and a fourth corner wall 158. The first side wall 151, the second side wall 152, the third side wall 153 and the fourth side wall 154 are all located on the periphery of the inner cavity 14. Specifically, the first side wall 151, the second side wall 152, the third side wall 153 and the fourth side wall 154 are all located on the periphery of the first circuit board 2.

[0028] Reference Figure 4 as well as Figure 5 , the first corner wall 155 is connected between the first side wall 151 and the second side wall 152, the second corner wall 156 is connected between the second side wall 152 and the third side wall 153, the third corner wall 157 is connected between the third side wall 153 and the fourth side wall 154, and the fourth corner wall 158 is connected between the fourth side wall 154 and the first side wall 151. Specifically, the projection of the first circuit board 2 on the projection plane 3 is a convex closed curve, and further the projection of the first circuit board 2 on the projection plane 3 is a circle; the first side wall 151 is parallel to the third side wall 153, and the second side wall 152 is parallel to the fourth side wall 154.

[0029] Reference Figure 5 as well as Figure 6 The first corner wall 155 and the third corner wall 157 are arranged diagonally, the second corner wall 156 and the fourth corner wall 158 are arranged diagonally, the inner cavity 14 has a first installation space 141, the first installation space 141 is located between the first corner wall 155 and the first circuit board 2, and the through hole 13 is arranged from the first corner wall 155 to penetrate the outer shell 1 in the direction away from the inner cavity 14. Specifically, the cable 22 is at least partially located in the first installation space 141.

[0030] Since the through hole 13 is arranged on the first corner wall 155, the distance between the first corner wall 155 and the first circuit board 2 is the longest distance between the first circuit board 2 and the inner peripheral side wall 15. When the length of the through hole 13 remains unchanged, the through hole 13 can be contained between the first circuit board 2 and the first corner wall 155 as much as possible, thereby reducing the footprint of the housing 1 as much as possible.

[0031] In some embodiments, reference Figure 5 as well as Figure 6 The inner cavity 14 has a second installation space 142, a third installation space 143 and a fourth installation space 144. The second installation space 142 is located between the first circuit board 2 and the second corner wall 156, the third installation space 143 is located between the first circuit board 2 and the third corner wall 157, and the fourth installation space 144 is located between the first circuit board 2 and the fourth corner wall 158.

[0032] The second installation space 142, the third installation space 143 and the fourth installation space 144 can accommodate other components in the housing 1, such as components connecting the first circuit board 2 and the housing 1, or components connecting two housings 1 together, so that the structure inside the housing 1 is more compact.

[0033] In some embodiments, reference Figure 2 as well as Figure 3 The housing 1 includes a first shell 11 and a second shell 12, and the first shell 11 and the second shell 12 are distributed along the vertical direction Z. The first shell 11 and the second shell 12 are fixedly connected or limit-connected. Specifically, the first shell 11 and the second shell 12 are connected to each other by one or more methods of welding, bonding, snap-fit ​​connection, and screw connection; the inner cavity 14 includes a first cavity 145 and a second cavity 146, the first shell 11 has a first cavity 145, and the second shell 12 has a second cavity 146, and the first cavity 145 and the second cavity 146 are connected; the detection component 21 is at least partially located in the first cavity 145, and the first circuit board 2 is located in the first cavity 145.

[0034] Reference Figure 5 as well as Figure 6 The first cavity 145 has a first installation space 141, the first shell 11 has an inner peripheral side wall 15 and a through hole 13, the inner peripheral side wall 15 is located outside the first cavity 145, the first cavity 145 has a second installation space 142, and the second installation space 142 is located between the first circuit board 2 and the second corner wall 156.

[0035] Reference Figure 3 as well as Figure 8 , along the vertical direction Z, the through hole 13 is arranged to penetrate the first shell 11 from the inside of the through hole 13 to the direction of the second shell 12, the gas detection device includes a sealing portion 131, the sealing portion 131 is at least partially located in the through hole 13, the cable 22 is arranged to penetrate the sealing portion 131, specifically, the sealing portion 131 has a first fixed block 1311 and a second fixed block 1312, along the extension direction of the first straight line X1, the first fixed block 1311 and the second fixed block 1312 are respectively located on both sides of the sealing portion 131, and the first fixed block 1311 and the second fixed block 1312 are both integrated with the sealing portion 131, and the sealing portion 131 is made of sealing materials such as rubber.

[0036] In some embodiments, reference Figure 3 as well as Figure 8The second shell 12 has a clamping portion 132. Along the vertical direction Z, the clamping portion 132 is located on one side of the sealing portion 131. The clamping portion 132 is at least partially located in the through hole 13. The clamping portion 132 and the hole wall of the through hole 13 clamp the sealing portion 131. Specifically, the clamping portion 132 and the second shell 12 are an integral piece. In some embodiments, the gas detection device includes a threaded portion 133 and a limiting portion 134, and the threaded portion 133 is located on one side of the sealing portion 131 along a direction perpendicular to the first straight line X1, and the threaded portion 133 passes through the first shell 11, and the threaded portion 133 is threadedly matched with the second shell 12, and along the vertical direction Z, the limiting portion 134 is located on one side of the threaded portion 133, and the limiting portion 134 is connected to the threaded portion 133; specifically, the first shell 11 has two mounting portions 111, and along the horizontal direction perpendicular to the first straight line X1, the two mounting portions 111 are located on both sides of the through hole 13, and the two threaded portions 133 correspond one-to-one to the two mounting portions 111, and along the vertical direction Z, the threaded portion 133 passes through the mounting portion 111, and the threaded portion 133 is threadedly connected to the second shell 12, and along the vertical direction Z, the limiting portion 134 is located on the side of the mounting portion 111 away from the second shell 12, and the limiting portion 134 conflicts with the mounting portion 111.

[0037] During installation, the sealing part 131 is placed into the through hole 13, the cable 22 is passed through the sealing part 131, and the second shell 12 is connected to the first shell 11, so that the clamping part 132 on the second shell 12 is embedded in the through hole 13 and pressed on the sealing part 131 to achieve sealing and reduce the water outside the gas detection device from entering the inner cavity 14 through the through hole 13; when the threaded part 133 passes through the first shell 11 from bottom to top, the threaded part 133 is threadedly matched with the second shell 12, and the limiting part 134 is pressed against the mounting part 111, so that the first shell 11 and the second shell 12 are pressed against each other, the pressure of the clamping part 132 on the sealing part 131 is increased, and the sealing performance is further improved.

[0038] In some embodiments, reference Fig. 9 as well as Fig.10Regarding the connection relationship between the first shell 11 and the second shell 12, the gas detection device includes a second rebound portion 43 and a second clamping portion 44, the second rebound portion 43 is connected to the inner peripheral side wall 15, and the second rebound portion 43 is located in the second installation space 142 or the third installation space 143 or the fourth installation space 144, the length direction of the second rebound portion 43 is arranged parallel to the vertical direction Z, and the second rebound portion 43 has a clamping hole 45; the second clamping portion 44 is connected to the second shell 12, the second clamping portion 44 is located in the inner cavity 14, the second clamping portion 44 is at least partially located in the clamping hole 45, the second clamping portion 44 has a second guide surface 47, and the second guide surface 47 is inclined relative to the vertical direction Z; specifically, the second clamping portion 44 and the second shell 12 are an integral part, and the second clamping portion 44 and the second shell 12 are both made of plastic, the second rebound portion 43 and the first shell 11 are an integral part, and the second rebound portion 43 and the first shell 11 are both made of plastic.

[0039] When connecting the first shell 11 with the second shell 12, the second rebound portion 43 is abutted against the second guide surface 47 of the second clamping portion 44, so that the second rebound portion 43 is deformed along the internal direction close to the inner cavity 14. When the second clamping portion 44 is aligned with the clamping hole 45, the second rebound portion 43 is restored, and the second clamping portion 44 is at least partially located in the clamping hole 45, thereby realizing the connection between the first shell 11 and the second shell 12.

[0040] In some embodiments, reference Figure 8 as well as Fig. 9 The shell 1 has a contact portion 16, which is located in the inner cavity 14. The shell 1 has a first buckling portion 4, which is at least partially located in the second installation space 142 or the third installation space 143 or the fourth installation space 144. Along the vertical direction Z, at least a portion of the first buckling portion 4 and the contact portion 16 are respectively located on both sides of the first circuit board 2, and the first buckling portion 4 and the contact portion 16 clamp the first circuit board 2.

[0041] In some embodiments, reference Figure 5 as well as Fig. 9 The first shell 11 has a contact portion 16, and the contact portion 16 and the first shell 11 are integrated. The contact portion 16 has a threaded hole 161, and the first circuit board 2 has a positioning hole 23 coaxially arranged with the threaded hole 161. The first circuit board 2 can be connected to the contact portion 16 by bolts.

[0042] Reference Figure 5 as well as Fig. 9The first shell 11 has a first snap-fitting portion 4, which includes a first clamping portion 42 and a first rebound portion 41. The extension direction of the first rebound portion 41 is parallel to the vertical direction Z. The first rebound portion 41 is located in the second installation space 142 or the third installation space 143 or the fourth installation space 144. The first clamping portion 42 is connected to the first rebound portion 41. Along the vertical direction Z, the first clamping portion 42 and the contact portion 16 are respectively located on both sides of the first circuit board 2. The first clamping portion 42 has a first guide surface 46, and the first guide surface 46 is inclined relative to the vertical direction Z.

[0043] When the first circuit board 2 is connected to the first shell 11, the first circuit board 2 contacts the first guide surface 46, so that the first rebound portion 41 is deformed in a direction away from the first circuit board 2. When the first circuit board 2 is located between the first clamping portion 42 and the contact portion 16, the first rebound portion 41 recovers, so that the first clamping portion 42 and the contact portion 16 clamp the first circuit board 2 in place.

[0044] In some embodiments, reference Figure 3 as well as Fig.11 The detection component 21 includes a shell part 211, a detection probe 212, a blocking part 213 and a light source 214. The blocking part 213 and the shell part 211 are both located in the shell 1. The shell 1 has a first connecting hole 5. The blocking part 213 has a diffusion cavity 216. The first connecting hole 5 is connected to the external gas of the gas detection device, and the first connecting hole 5 is connected to the gas of the diffusion cavity 216; the shell part 211 has a second connecting hole 2111 and a detection cavity 2112. The detection probe 212 is at least partially located in the detection cavity 2112. The light source 214 is at least partially located in the detection cavity 2112. The light source 214 and the detection probe 212 are both electrically connected to the first circuit board 2, and the second connecting hole 2111 is connected to the detection cavity 2112.

[0045] Reference Fig.11 as well as Fig.13 The diffusion cavity 216 has an air inlet 2161 and a bottom port 2162. Along the height direction of the gas detection device, the air inlet 2161 is closer to the first connecting hole 5 than the bottom port 2162. The flow area of ​​the air inlet 2161 is larger than the flow area of ​​the bottom port 2162. The second connecting hole 2111 is at least partially located at the bottom port 2162.

[0046] In some embodiments, reference Fig.11 as well as Fig.12The extension direction of the shell 211 is parallel to the extension direction of the first straight line X1. The detection component 21 also includes a second circuit board 217, a focusing cup 215 and a third circuit board 218. The second circuit board 217 and the third circuit board 218 are both parallel to the vertical direction Z. Along the extension direction of the first straight line X1, the second circuit board 217 and the third circuit board 218 are respectively located on both sides of the shell 211. The detection probe 212 is electrically connected to the second circuit board 217, the light source 214 is electrically connected to the third circuit board 218, the focusing cup 215 is connected to the third circuit board 218, the light source 214 is located in the focusing cup 215, and the second circuit board 217 and the third circuit board 218 are both electrically connected to the first circuit board 2.

[0047] In some embodiments, reference Figure 3 as well as Fig.11 The gas detection device includes a support portion 7 and a waterproof breathable membrane 71. Along the vertical direction Z, the support portion 7 is closer to the first connecting hole 5 than the air inlet 2161. The support portion 7 has a plurality of third connecting holes 72 arranged corresponding to the first connecting holes 5. The third connecting holes 72 are gaseously connected to the diffusion cavity 216. The third connecting holes 72 are gaseously connected to the first connecting hole 5. The waterproof breathable membrane 71 is located between the third connecting holes 72 and the first connecting hole 5. The waterproof breathable membrane 71 completely covers the first connecting hole 5 and the third connecting holes 72.

[0048] In some embodiments, reference Figure 4 The gas detection device includes a controllable switch element 6 and a processing chip. The controllable switch element 6 and the processing chip are both electrically connected to the first circuit board 2 , and the processing chip controls the controllable switch element 6 .

[0049] In some embodiments, reference Figure 4 The controllable switch element 6 includes a first relay 61 and a second relay 62, both of which are electrically connected to the first circuit board 2. The processing chip controls the first relay 61 and the second relay 62. When a problem occurs in the circuit of the first circuit board 2, such as a short circuit, the processing chip controls the first relay 61 to change from a normally closed state to a normally open state; when the concentration in the detection cavity 2112 reaches a preset value, the processing chip controls the second relay 62 to change from a normally open state to a normally closed state, and outputs an electrical signal to the alarm or the main power control switch.

[0050] The above implementation modes are only used to illustrate the present application and are not intended to limit the technical solutions described in the present application. The understanding of the present application should be based on the technical personnel in the relevant technical field. Although the present application has been described in detail in this specification with reference to the above implementation modes, ordinary technical personnel in the field should understand that the technical personnel in the relevant technical field can still modify or make equivalent substitutions to the present application, and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present application should be included in the scope of the claims of the present application.

Claims

1. A gas detection device, characterized in that: The invention comprises a housing, a first circuit board, a detection component and a cable, wherein the housing has a through hole and an inner cavity, the first circuit board and the detection component are both located in the inner cavity, the detection component is connected to the first circuit board, the cable is electrically connected to the first circuit board, and the cable is at least partially located in the through hole; A plane perpendicular to the height direction of the gas detection device is defined as a projection plane, and the projection plane has a first straight line and a second straight line; the hole wall of the through hole has a first projection on the projection plane, and the first straight line extends along the length direction of the first projection; the second straight line extends along the width direction or the length direction of the gas detection device; the first straight line is inclined at an acute angle relative to the second straight line.

2. The gas detection device according to claim 1, characterized in that: The housing has an inner peripheral side wall, the inner peripheral side wall is arranged around the first circuit board, the inner peripheral side wall includes a first side wall, a second side wall, a third side wall and a fourth side wall, the first side wall, the second side wall, the third side wall and the fourth side wall are all located at the periphery of the inner cavity, the inner peripheral side wall also includes a first corner wall, a second corner wall, a third corner wall and a fourth corner wall, the first corner wall is connected between the first side wall and the second side wall, the second corner wall is connected between the second side wall and the third side wall, the third corner wall is connected between the third side wall and the fourth side wall, and the fourth corner wall is connected between the fourth side wall and the first side wall; The first corner wall is diagonally arranged with the third corner wall, the second corner wall is diagonally arranged with the fourth corner wall, the inner cavity has a first installation space, the first installation space is located between the first corner wall and the first circuit board, and the cable is at least partially located in the first installation space.

3. The gas detection device according to claim 2, characterized in that: The projection of the first circuit board on the projection plane is a convex closed curve, the first side wall is arranged in parallel with the third side wall, and the second side wall is arranged in parallel with the fourth side wall.

4. The gas detection device according to claim 2 or 3, characterized in that: The projection of the first circuit board on the projection plane is circular, the inner cavity has a second installation space, a third installation space and a fourth installation space, the second installation space is located between the first circuit board and the second corner wall, the third installation space is located between the first circuit board and the third corner wall, and the fourth installation space is located between the first circuit board and the fourth corner wall, the outer shell has a first buckling portion, the first buckling portion is at least partially located in the second installation space, the outer shell has a resistance portion, the resistance portion is located in the inner cavity, and the resistance portion and the first buckling portion clamp the first circuit board; along the height direction of the gas detection device, at least part of the first buckling portion and the resistance portion are respectively located on both sides of the first circuit board.

5. The gas detection device according to claim 4, characterized in that: The first snap-fitting portion includes a first rebound portion and a first clamping portion, the first rebound portion is located in the second installation space, and the first clamping portion is connected to the first rebound portion; along the height direction of the gas detection device, the first clamping portion and the interference portion are respectively located on both sides of the thickness direction of the first circuit board.

6. The gas detection device according to claim 2, characterized in that: The housing comprises a first shell and a second shell, the first shell is fixedly connected or position-limitedly connected to the second shell, the inner cavity comprises a first cavity and a second cavity, the first shell has the first cavity, the second shell has the second cavity, the first cavity is communicated with the second cavity, at least part of the detection component and the first circuit board are located in the first cavity, the first cavity has the first installation space, the first shell has the inner peripheral side wall and the through hole, the inner peripheral side wall is located at the periphery of the first cavity, the first cavity has the second installation space, and the second installation space is located between the first circuit board and the second corner wall; Along the height direction of the gas detection device, the through hole is arranged to penetrate the first shell from the inside of the through hole to the direction of the second shell, the gas detection device includes a sealing portion, the sealing portion is at least partially located in the through hole, the cable is arranged to pass through the sealing portion, the second shell has a clamping portion, the clamping portion is at least partially located in the through hole, and the clamping portion and the hole wall of the through hole clamp the sealing portion.

7. The gas detection device according to claim 6, characterized in that: The gas detection device includes a threaded portion and a limiting portion. Along a direction perpendicular to the first straight line, the threaded portion is located on one side of the sealing portion, the threaded portion penetrates the first shell, and the threaded portion is threadably matched with the second shell. Along a height direction of the gas detection device, the limiting portion is located on one side of the threaded portion, the limiting portion is connected to the threaded portion, and the limiting portion at least partially conflicts with the first shell.

8. The gas detection device according to claim 6, characterized in that: The gas detection device includes a second rebound portion and a second clamping portion, the second rebound portion is connected to the first shell, and the second rebound portion is at least partially located in the second installation space, the second rebound portion has a clamping hole, the second clamping portion is connected to the second shell, the second clamping portion is located in the second cavity, and the second clamping portion is at least partially located in the clamping hole.

9. The gas detection device according to claim 1, characterized in that: The detection assembly comprises a shell part, a detection probe, a blocking part and a light source, wherein the blocking part and the shell part are both located in the shell; the shell has a first connecting hole, the blocking part has a diffusion cavity, the first connecting hole is connected to the external gas of the gas detection device, and the first connecting hole is connected to the gas of the diffusion cavity; the shell part has a second connecting hole and a detection cavity, the detection probe is at least partially located in the detection cavity, the light source is at least partially located in the detection cavity, the light source and the detection probe are both electrically connected to the first circuit board, and the second connecting hole is connected to the detection cavity; The diffusion cavity has an air inlet and a bottom port; along the height direction of the gas detection device, the air inlet is closer to the first connecting hole than the bottom port, the flow area of ​​the air inlet is larger than the flow area of ​​the bottom port, and the second connecting hole is at least partially located at the bottom port.

10. The gas detection device according to claim 1 or 9, characterized in that: The gas detection device comprises a controllable switch element and a processing chip, wherein the controllable switch element and the processing chip are both electrically connected to the first circuit board, and the processing chip controls the controllable switch element; The controllable switch element includes a first relay and a second relay, the first relay and the second relay are both electrically connected to the first circuit board, and the processing chip controls the first relay and the second relay.

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