Gas sensor

Abstract

A gas sensor includes a gas detection assembly, a housing, and a flow guide member. The gas detection assembly comprises a first detection probe and a second detection probe, the first detection probe is used for detecting gas, and the second detection probe is used for detecting at least one of temperature, humidity and pressure. The diversion member accelerates the time response of the gas detection probe. The second detection probe can be used for compensating the detection result of the first detection probe, so that the gas detection precision of the first detection probe is improved. The gas sensor provided by the invention is beneficial to quickening gas detection time response and improving gas detection precision.

Description

Technical Field

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

[0002] The sensor includes a detection component and a housing. The detection component is contained in the housing. The detection component includes a gas detection probe, which is used to detect gas. In the related art, a flow guide is arranged in the housing. The flow guide can guide the external fluid to the gas detection probe to speed up the time response of the gas detection probe. During the detection process, the external environment affects the detection accuracy of the gas detection probe. Summary of the invention

[0003] The purpose of the present application is to provide a gas sensor that is beneficial to improving gas detection accuracy.

[0004] The gas sensor provided in the present application comprises a gas detection component, a housing and a flow guide;

[0005] The gas detection assembly includes a first detection probe and a second detection probe, the first detection probe includes a gas detection probe, and the second detection probe includes at least one of a temperature detection probe, a humidity detection probe and a pressure detection probe;

[0006] The first detection probe has an air chamber and an air hole, the air hole is connected to the air chamber, and the air chamber is connected to the external gas of the sensor; the first detection probe includes a detection shell, the detection shell is at least partially located outside the air chamber, the detection shell has an air hole portion, and the air hole is arranged in the air hole portion;

[0007] The gas sensor has an inner cavity, the outer shell is at least partially located on the periphery of the inner cavity, the gas detection component and the flow guide are at least partially located in the inner cavity; the inner cavity includes a first cavity and a second cavity, the first cavity is connected to the outside of the sensor, the flow guide is at least partially located on the periphery of the first cavity, and the flow guide is at least partially located on the periphery of the second cavity; the air hole portion is at least partially located on the periphery of the first cavity;

[0008] The second detection probe is at least partially located at the periphery of the first cavity; or, the first cavity is communicated with the second cavity, and the second detection probe is at least partially located in the second cavity.

[0009] The present application includes a second detection probe, which includes at least one of a temperature detection probe, a humidity detection probe, and a pressure detection probe, and the second detection probe is at least partially located outside the first cavity; or, the first cavity is connected to the second cavity, and the second detection probe is at least partially located in the second cavity. The second detection probe can be used to compensate for the detection result of the first detection probe and improve the gas detection accuracy of the first detection probe. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 is a three-dimensional diagram of a gas sensor provided in one embodiment of the present application;

[0011] Figure 2 is an explosion diagram of a gas sensor provided in one embodiment of the present application;

[0012] Figure 3 is a cross-sectional schematic diagram of a gas sensor provided in one embodiment of the present application;

[0013] Figure 4 is a cross-sectional schematic diagram of a gas sensor provided in one embodiment of the present application;

[0014] Figure 5 is a three-dimensional diagram of a flow guide provided in one embodiment of the present application;

[0015] Figure 6 is a three-dimensional diagram of a flow guide provided in one embodiment of the present application;

[0016] Figure 7 is a top view of a flow guide provided in one embodiment of the present application;

[0017] Figure 8 is a schematic diagram of a first surface and a second surface provided by an embodiment of the present application;

[0018] Fig. 9 is a cross-sectional schematic diagram of a flow guide provided in one embodiment of the present application;

[0019] Fig.10 is a three-dimensional diagram of a support member provided in one embodiment of the present application;

[0020] Fig.11 is a top view of a support member provided in one embodiment of the present application;

[0021] Fig.12 is a three-dimensional diagram of a first housing provided in one embodiment of the present application;

[0022] Fig.13 is a cross-sectional schematic diagram of a first housing provided in one embodiment of the present application;

[0023] Fig.14is a three-dimensional diagram of a first housing provided in one embodiment of the present application;

[0024] Fig.15 is a three-dimensional diagram of a second housing provided in one embodiment of the present application;

[0025] Fig.16 is a cross-sectional schematic diagram of a second housing provided in one embodiment of the present application;

[0026] Fig.17 It is a top view schematic diagram of a circuit board provided in one embodiment of the present application. DETAILED DESCRIPTION

[0027] In order to better understand the technical solution of the present application, the embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0028] It should be clear that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0029] The sensor includes a detection component and a housing 2. The detection component is accommodated in the housing 2. The detection component includes a gas detection probe 10. The gas detection probe 10 is used to detect gas. In the related art, a flow guide 3 is arranged in the housing 2. The flow guide 3 can guide the external fluid to the gas detection probe 10 and speed up the time response of the gas detection probe 10. During the detection process, the external environment affects the detection accuracy of the gas detection probe 10.

[0030] The first aspect of the present application provides a gas sensor 100, for example Figure 1 to Figure 4As shown, it includes a gas detection component 1, a housing 2 and a flow guide 3. The gas detection component 1 includes a first detection probe 11 and a second detection probe 12. The first detection probe 11 is used to detect gas, and the second detection probe 12 is used to detect at least one of temperature, humidity and pressure. The first detection probe 11 has an air chamber 113 and an air hole 111. The air hole 111 is connected to the air chamber 113, and the air chamber 113 is connected to the external gas of the sensor; the first detection probe 11 includes a detection shell 114, the detection shell 114 is at least partially located on the periphery of the air chamber 113, and the detection shell 114 has an air hole portion 112, and the air hole 111 is arranged in the air hole portion 112. The gas sensor 100 has an inner cavity 101, the outer shell 2 is at least partially located on the periphery of the inner cavity 101, the gas detection assembly 1 is at least partially located on the periphery of the inner cavity 101, and the flow guide 3 is at least partially located on the inner cavity 101; the inner cavity 101 includes a first cavity 102 and a second cavity 103, the first cavity 102 is connected to the outside of the sensor, the flow guide 3 is at least partially located on the periphery of the first cavity 102, and the flow guide 3 is at least partially located on the periphery of the second cavity 103; the pore portion 112 is at least partially located on the periphery of the first cavity 102. The second detection probe 12 is at least partially located on the periphery of the first cavity 102; or, the first cavity 102 is connected to the second cavity 103, and the second detection probe 12 is at least partially located on the second cavity 103.

[0031] In the present application, the flow guide 3 can guide the gas to the first cavity 102, and the gas enters the pore portion 112 from the first cavity 102, thereby accelerating the time response of the gas detection probe 10. The gas sensor 100 of the present application also includes a second detection probe 12, which includes at least one of a temperature detection probe, a humidity detection probe, and a pressure detection probe; the second detection probe 12 is used to detect at least one of the ambient temperature, ambient humidity, and ambient pressure, or in other words, the second detection probe 12 is used to detect at least one of the atmospheric temperature, atmospheric humidity, and atmospheric pressure. The second detection probe 12 is at least partially located at the periphery of the first cavity 102; or, the first cavity 102 is connected to the second cavity 103, and the second detection probe 12 is at least partially located in the second cavity 103. The second detection probe 12 can be used to compensate for the detection result of the first detection probe 11, and improve the gas detection accuracy of the first detection probe 11. In some embodiments, the first detection probe 11 is used to detect gas leakage, such as refrigerant leakage. In some embodiments, the first detection probe 11 can perform gas detection based on the thermal conductivity, temperature, light absorption rate, and other properties of the gas. The first detection probe 11 may be a thermal conductivity gas detection probe, an infrared gas detection probe, a semiconductor gas detection probe, a thermopile gas detection probe, or other probes that perform gas detection based on different detection principles.

[0032] In some embodiments, for example Figure 4As shown, the first detection probe 11 includes a thermistor 115, a lead-out portion 116 and a conductive terminal 117. The resistance of the thermistor 115 changes with the change of gas concentration. For example, the thermistor 115 is an NTC thermistor 115. In some embodiments, when the temperature of the thermistor 115 rises due to the influence of the gas to be measured, its resistance decreases or increases accordingly. The thermistor 115 and the lead-out portion 116 are both located in the gas chamber 113, a part of the conductive terminal 117 is located in the gas chamber 113, a part of the conductive terminal 117 extends out of the detection housing 114 and is located outside the gas chamber 113, and the part of the conductive terminal 117 located outside the gas chamber 113 is electrically connected to the circuit board 14. When the gas to be measured enters the gas chamber 113 through the air hole 111, causing the resistance of the thermistor 115 to change, the electrical signal is transmitted to the circuit board 14 through the lead-out portion 116 and the conductive terminal 117, and other electronic components on the circuit board 14 process the electrical signal.

[0033] In some embodiments, the gas detection assembly 1 includes a third detection probe 13, which serves as a reference probe for the first detection probe 11. Figure 3 As shown, the third detection probe 13 also includes a thermistor 115, a lead portion 116 and a conductive terminal 117. The third detection probe 13 includes a reference housing 132. The difference between the third detection probe 13 and the first detection probe 11 is that the reference housing 132 does not have an air hole 111, and the air chamber 113 of the third detection probe 13 is a closed air chamber 113. In some embodiments, for example Figure 4 As shown, the reference housing 132 has a sealing portion 131, which corresponds to the air hole portion 112 of the detection housing 114. The sealing portion 131 is located at the periphery of the first cavity 102 mentioned above. The third detection probe 13 is conducive to improving the gas detection accuracy of the first detection probe 11.

[0034] In some embodiments, for example Figure 4 As shown, the flow guide 3 has a drainage hole 33, which runs through the flow guide 3, and the drainage hole 33 is connected to the first cavity 102, and the drainage hole 33 is connected to the second cavity 103. That is to say, the inner cavity 101 is at least partially divided into the first cavity 102 and the second cavity 103 by the flow guide 3, and the flow guide 3 is provided with the drainage hole 33, and the drainage hole 33 is connected to the first cavity 102 and the second cavity 103. The flow guide 3 includes a drainage hole portion 321, and the drainage hole portion 321 includes the drainage hole 33 and the drainage hole 33 wall, and the drainage hole 33 wall is located at the periphery of the drainage hole 33. A first plane perpendicular to the height direction H of the sensor is defined as a projection plane, and along the height direction H of the sensor, the orthographic projection of the drainage hole portion 321 on the projection plane is a first projection, and the orthographic projection of the second detection probe 12 on the projection plane is a second projection, and the second projection is at least partially located within the outer contour of the first projection, for example Figures 5 to 9As shown. That is to say, the drainage hole 33 is arranged in alignment with the second detection probe 12, so that the drainage hole 33 is convenient for guiding the gas in the first cavity 102 to the second detection probe 12. In fact, the first detection probe 11 detects the gas flowing from the first cavity 102 to the gas chamber 113, and at the same time, the gas in the first cavity 102 is guided to the second detection probe 12 through the drainage hole 33, which is conducive to the second detection probe 12 to detect at least one of the temperature, humidity and pressure of the environment where the first detection probe 11 is located, and is conducive to the second detection probe 12 to compensate for the detection result of the first detection probe 11, and the compensation is at least one of temperature compensation, humidity compensation and pressure compensation.

[0035] In some embodiments, for example Figure 1 to Figure 4 As shown, the housing 2 has a through hole 21, which is connected to the outside of the sensor and the first cavity 102. The housing 2 includes a through hole portion 22, and the through hole 21 is arranged in the through hole portion 22. The drainage hole portion 321 includes a first orifice portion 322, and the drainage hole 33 includes a first orifice 331; the first orifice portion 322 includes a first orifice 331 and a first hole wall, and the first hole wall is located at the periphery of the first orifice 331. The flow guide 3 has a flow guide surface, which is at least partially located at the periphery of the first cavity 102, and the first orifice 331 is located on the flow guide surface. Along the height direction H of the sensor, the orthographic projection of the through hole portion 22 on the projection surface is the third projection, and the orthographic projection of the first orifice portion 322 on the projection surface is the fourth projection, and the fourth projection is at least partially located within the outer contour of the third projection. That is to say, the first orifice 331 is aligned with the through hole 22 of the housing 2 , which is conducive to the gas outside the sensor to quickly enter the first orifice 331 through the through hole 22 and reach the second detection probe 12 through the drainage hole 33 .

[0036] In some embodiments, in combination Figure 3 , Figure 4 and Figures 5 to 9As shown, the guide member 3 has a guide cavity 37, and the guide cavity 37 is at least partially used to form the first cavity 102, and the first cavity 102 includes the guide cavity 37. The through hole 21 and the air hole 111 are both connected to the guide cavity 37, and the guide cavity 37 is at least partially close to the air hole 111 relative to the through hole 21; the guide cavity 37 has an opening 3031. The guide member 3 includes a first end 301 and a second end 302. Along the height direction H of the sensor, the first end 301 and the second end 302 are respectively located on both sides of the guide member 3, the first end 301 is close to the through hole 21 relative to the second end 302, and the opening 3031 is located at the first end 301. The guide member 3 includes an opening portion 303, and the opening portion 303 is located at the first end 301, and the opening portion 303 is located at the periphery of the opening 3031. Along the height direction H of the sensor, the opening portion 303 is close to the through-hole portion 22 relative to the first detection probe 11, the opening portion 303 is close to the through-hole portion 22 relative to the second detection probe 12, and the opening portion 303 is close to the through-hole portion 22 relative to the third detection probe 13. After the gas outside the sensor passes through the through-hole portion 22, it enters the first cavity 102 through the opening 3031. Along the height direction H of the sensor, the orthographic projection of the opening portion 303 on the projection plane is the fifth projection, and the fifth projection is at least partially located within the outer contour of the third projection. In other words, the opening portion 303 is at least partially aligned with the through-hole portion 22, which is conducive to the gas quickly passing through the through-hole portion 22 and the opening portion 303 into the first cavity 102. In some embodiments, the inner diameter of the guide cavity 37 gradually decreases from the first end 301 to the second end 302.

[0037] In some embodiments, the orthographic projection of the pore portion 112 on the projection plane is the sixth projection, the sixth projection is at least partially located within the outer contour of the third projection, and the sixth projection is at least partially located within the outer contour of the fifth projection. In other words, the pore portion 112 is at least partially aligned with the through hole portion 22, and the pore portion 112 is at least partially aligned with the opening portion 303, which is conducive to the gas quickly passing through the through hole portion 22 into the first cavity 102, and entering the pore 111 and the air chamber 113 through the first cavity 102.

[0038] In some embodiments, for example Figures 5 to 9 As shown, the flow guide 3 includes a body portion 31 and a drainage portion 32, the drainage portion 32 is connected to the body portion 31, the drainage portion 32 protrudes from the body portion 31, and the drainage hole 33 runs through the body portion 31 and the drainage portion 32. The body portion 31 has a first orifice 331; the drainage hole 33 includes a second orifice 332, and the drainage portion 32 has a second orifice 332, the second orifice 332 is farther away from the first cavity 102 than the first orifice 331, and the second orifice 332 is closer to the second detection probe 12 than the first orifice 331. Specifically, for example Figure 3As shown, along the height direction H of the sensor, the height of the second detection probe 12 is less than the height of the first detection probe 11. In order to guide the fluid flowing into the first cavity 102 to the second detection probe 12, a drainage portion 32 may be provided. The drainage portion 32 reduces the diffusion of the fluid in the first cavity 102 to other spaces of the inner cavity 101 before flowing to the second detection probe 12, which is conducive to accelerating the time response of the second detection probe 12. In some embodiments, along the height direction H of the sensor, the through hole 21 penetrates the side wall 23 of the housing 2, and the drainage hole 33 penetrates the guide member 3; the extension direction of the through hole 21 is parallel to the extension direction of the drainage hole 33.

[0039] In some embodiments, one end of the drainage portion 32 is connected to the main body 31, and the other end of the drainage portion 32 is a free end. There is a distance between the free end of the drainage portion 32 and the main body 31, and there is a distance between the free end of the drainage portion 32 and the circuit board 14. Figure 3 shown.

[0040] In some embodiments, for example Fig. 9 As shown, the drainage hole 33 includes a first section 333 and a second section 334, the first section 333 has a first orifice 331, the second section 334 has a second orifice 332, the first section 333 and the second section 334 are both cylindrical, and the diameter of the first section 333 is smaller than the diameter of the second section 334. In a specific embodiment, the second detection probe 12 may be at least partially located in the second section 334, or may be located outside the drainage hole 33. The larger diameter of the second section 334 can reduce the interference of the second detection probe 12 with the drainage portion 32. In some embodiments, the drainage portion 32 is cylindrical.

[0041] In some embodiments, the housing 2 has a cavity 20, the flow guide 3 is at least partially located in the cavity 20, and the gas detection probe 10 is at least partially located in the cavity 20. The cavity 20 includes a first cavity 201 and a second cavity 202, the first cavity 201 is at least partially used to form the first cavity 102, and the second cavity 202 is at least partially used to form the second cavity 103. The body portion 31 is at least partially located at the periphery of the first cavity 201, the pore portion 112 is at least partially located at the periphery of the first cavity 201, the body portion 31 is at least partially located at the periphery of the second cavity 202, the flow guide portion 32 is at least partially located in the second cavity 202, and the gas detection component 1 is at least partially located in the second cavity 202. For example Figure 3 As shown, the gas detection assembly 1 includes a circuit board 14, and the first detection probe 11, the second detection probe 12 and the third detection probe 13 are all electrically connected to the circuit board 14. The circuit board 14 and the second detection probe 12 are both located in the second cavity 202, and at least a portion of the first detection probe 11 and at least a portion of the third detection probe 13 are both located in the second cavity 202.

[0042] In some embodiments, the height direction H of the sensor is parallel to the thickness direction of the circuit board 14. Along the height direction H of the sensor, the guide member 3 is located on one side of the circuit board 14, and at least a portion of the first detection probe 11, at least a portion of the second detection probe 12 and the guide member 3 are located on the same side of the circuit board 14; along the height direction H of the sensor, a portion of the drainage portion 32 is close to the circuit board 14 relative to the body portion 31, and there is a distance between the drainage portion 32 and the circuit board 14, for example Figure 3 In this way, the interference between the drainage portion 32 and the circuit board 14 can be reduced, the first cavity 102 is connected with the second cavity 103 through the drainage portion 32 , and the gas can smoothly flow from the first cavity 102 to the second detection probe 12 through the drainage portion 32 .

[0043] In some embodiments, for example Figures 5 to 9 As shown, the guide member 3 includes a top 34, a bottom 35 and a transition portion 36, and the top 34 and the bottom 35 are both connected to the transition portion 36. In the height direction H of the sensor, the transition portion 36 is close to the top 34 relative to the bottom 35. The top 34 is connected to the housing 2. The bottom 35 has a through hole 352, and the through hole 352 passes through the guide member 3. The first detection probe 11 is at least partially located in the through hole 352. The top 34 includes a first surface 341, the bottom 35 includes a second surface 351, and the transition portion 36 includes a third surface 361. Along the height direction H of the sensor, the first surface 341, the second surface 351 and the third surface 361 are located on the same side of the guide member 3, and the second surface 351 is at least partially located at the periphery of the first cavity 102; the first surface 341 and the second surface 351 are both connected to the third surface 361, and the third surface 361 is at least partially an arc surface. The first surface 341 is connected to a portion of the arc surface of the third surface 361, and the second surface 351 is connected to a portion of the arc surface of the third surface 361. In other words, there is an arc transition between the first surface 341 and the third surface 361, and there is an arc transition between the second surface 351 and the third surface 361.

[0044] In some embodiments, the gas detection assembly 1 includes a first detection probe 11 and a third detection probe 13, and at least a portion of the first detection probe 11 and at least a portion of the third detection probe 13 are both located in the through hole 352. Figure 5 and Figure 6 As shown, the bottom 35 has at least two through-holes 352, and the at least two through-holes 352 include a first through-hole 3521 and a second through-hole 3522. The first detection probe 11 is at least partially located in the first through-hole 3521, and the second detection probe 12 is at least partially located in the second through-hole 3522. In some embodiments, the first through-hole 3521 is closer to the drainage portion 32 than the second through-hole 3522.

[0045] In some embodiments, the first surface 341 is a plane, which facilitates the connection between the top 34 and the housing 2. The second surface 351 is a plane, which facilitates perforation. In some embodiments, the top 34 is a flat plate, the bottom 35 is a flat plate, and the space enclosed by the transition portion 36 is a conical column.

[0046] In some embodiments, along the height direction H of the sensor, the orthographic projection of the opening 303 on the projection plane described above is the fifth projection, the orthographic projection of the bottom 35 on the projection plane is the seventh projection, the orthographic projection of the top 34 on the projection plane is the eighth projection, and the orthographic projection of the transition portion 36 on the projection plane is the ninth projection. The area enclosed by the outer contour of the seventh projection on the projection plane is smaller than the area enclosed by the outer contour of the fifth projection on the projection plane. The eighth projection is at least partially located on the periphery of the fifth projection, the eighth projection is at least partially located on the periphery of the ninth projection, and the ninth projection is at least partially located on the periphery of the seventh projection.

[0047] In some embodiments, for example Figure 8 As shown, the third surface 361 has a first point A and a second point B. Along the height direction H of the sensor, the first point A is away from the bottom 35 relative to the second point B. A second plane perpendicular to the height direction H of the sensor is defined as a cross section, the cross section includes a first cross section and a second cross section, the first point A is located in the first cross section, and the second point B is located in the second cross section; the first cross section intersects with the third surface 361 to obtain a first loop line C1, and the second cross section intersects with the third surface 361 to obtain a second loop line C2, the surface surrounded by the first loop line C1 in the first cross section is the first surface S1, the surface surrounded by the second loop line C2 in the second cross section is the second surface S2, and the area of ​​the first surface S1 is greater than the area of ​​the second surface S2.

[0048] In some embodiments, for example Figure 8 As shown, the first loop line C1 and the second loop line C2 are both circular rings, the radius of the first loop line C1 is greater than the radius of the second loop line C2, and the first loop line C1 and the second loop line C2 are coaxial; the first loop line C1 has a first dot, the second loop line C2 has a second dot, and the line connecting the first dot and the second dot is parallel to the height direction H of the sensor. The third surface 361 has a top 3611 and a bottom 3612, the top 3611 is connected to the first surface 341, the bottom 3612 is connected to the second surface 351, and the third surface 361 has a top 3611 and a bottom 3612, and the top 3611 is connected to the first surface 341, and the bottom 3612 is connected to the second surface 351. Figure 7 and Figure 8As shown. The first point A is located at the top 3611, and the second point B is located at the bottom 3612; the ratio of the area of ​​the first surface S1 to the area of ​​the second surface S2 is 2 to 4, for example, 2.5, 3, 3.5, etc. Along the height direction H of the sensor, the distance between the first point A and the second point B is the height of the guide 3, and the ratio of the height of the guide 3 to the diameter of the second surface S2 is 3 to 5, for example, 3.5, 4, 4.5, etc. A third plane parallel to the height direction H of the sensor is defined as a tangent plane, the tangent plane intersects with the second surface 351 to obtain a first tangent line L1, and the tangent plane intersects with the third surface 361 to obtain a second tangent line L2, the first tangent line L1 and the second tangent line L2 are both straight lines, and the angle α between the first tangent line L1 and the second tangent line L2 is 30° to 60°, for example, 35°, 40°, 45°, 50°, 55°, etc., for example Fig. 9 In this way, the speed at which the gas passes through the flow guiding cavity 37 and reaches the air hole portion 112 and the sealing portion 131 can be accelerated, thereby accelerating the time response.

[0049] In some embodiments, the housing 2 includes a side wall 23 and a limiting portion 27, the through hole 21 passes through the side wall 23, the side wall 23 includes a through hole portion 22, and the through hole 21 is disposed in the through hole portion 22, for example Figures 12-14 As shown. The limiting portion 27 is connected to the side wall 23. The limiting portion 27 is located in the cavity 20, and the cavity 20 includes a limiting cavity 272, or in other words, the limiting portion 27 is located in the inner cavity 101, and the inner cavity 101 includes a limiting cavity 272. The limiting portion 27 is located at the periphery of the limiting cavity 272, and the through hole 21 is connected to the limiting cavity 272. The flow guide 3 is at least partially located in the limiting cavity 272, and the flow guide 3 is fixedly connected or limitedly connected to the limiting portion 27. Specifically, the through hole portion 22 is circular, the limiting portion 27 is located at the periphery of the through hole portion 22, the limiting portion 27 is a circular arc plate-shaped component, the limiting portion 27 has a free end, and the free end is located in the cavity 20; the limiting portion 27 is provided with a first limiting groove 271, which is perpendicular to the height direction H of the sensor, and the first limiting groove 271 runs through the limiting portion 27. The guide member 3 includes a main body 31 and a first protrusion 38. The first protrusion 38 is connected to the main body 31. The first protrusion 38 protrudes from the main body 31 in a direction away from the guide cavity 37. Specifically, for example Figure 5 and Figure 6 As shown, the first protrusion 38 is connected to the top 34 of the guide member 3. The main body 31 includes the top 34, the transition portion 36 and the bottom 35 mentioned above, and the first protrusion 38 protrudes from the top 34 in a direction away from the guide cavity 37. The main body 31 is at least partially located in the limiting cavity 272, and the first protrusion 38 is at least partially located in the first limiting groove 271.

[0050] In some embodiments, the first protrusion 38 includes a first sub-protrusion 381 and a second sub-protrusion 382. The first sub-protrusion 381 is at least partially located in the first limiting groove 271, and the first sub-protrusion 381 is limitedly connected to the limiting portion 27. The second sub-protrusion 382 is at least partially located inside the housing 2. Specifically, for example Figure 3 and Fig.13 As shown, the side wall 23 of the housing has a positioning groove 200 , and the second sub-protrusion 382 is at least partially located in the positioning groove 200 .

[0051] In some embodiments, the flow guide 3 has a notch 39, for example Figure 5 As shown, the notch 39 is located in the main body 31 of the flow guide 3. The gas detection assembly 1 includes other electronic components in addition to the first detection probe 11 and the third detection probe 13, and the other electronic components are at least partially located in the notch 39. The notch 39 reduces the mutual interference between the flow guide 3 and other electronic components in addition to the first detection probe 11 and the third detection probe 13, so that the arrangement of the electronic components included in the gas detection assembly 1 is more compact.

[0052] In some embodiments, the sensor includes a support 4 and a waterproof and breathable membrane 5, for example Figure 2 As shown. The support member 4 and the waterproof breathable membrane 5 are both located in the cavity 20, and the waterproof breathable membrane 5 is at least partially clamped between the through hole portion 22 and the support member 4. Along the height direction H of the sensor, the support member 4 is at least partially close to the through hole portion 22 relative to the guide member 3, and the support member 4 is at least partially located in the limiting cavity 272, and the support member 4 is fixedly connected or limitedly connected to the limiting portion 27. For example Figure 3 As shown, the support member 4 covers the through hole portion 22. Along the height direction H of the sensor, the orthographic projection of the support member 4 on the projection surface mentioned above is the tenth projection, the orthographic projection of the waterproof breathable membrane 5 on the projection surface mentioned above is the eleventh projection, the third projection corresponding to the through hole portion 22 is located within the outer contour of the tenth projection, and the third projection corresponding to the through hole portion 22 is located within the outer contour of the eleventh projection. In this way, the waterproof breathable membrane 5 can cover the through hole portion 22, the outside of the sensor is gaseously connected to the first cavity 102, and the liquid outside the sensor cannot enter the first cavity 102 through the waterproof breathable membrane 5. In some embodiments, the support member 4 has a vent 43, the vent 43 is arranged through the support member 4, and the vent 43 is at least partially aligned with the through hole 21. In some embodiments, the vent 43 and the through hole 21 have the same shape, for example, the vent 43 and the through hole 21 are both regular hexagons.

[0053] In some embodiments, the support member 4 is fixedly connected or positionally connected to the housing 2, for example Fig.10 and Fig.11As shown. Specifically, for example, the support member 4 includes a main body 41 and a second convex portion 42, the air vent 43 is provided on the main body 41, and the second convex portion 42 protrudes outward from the main body 41. The main body 41 is located in the limiting cavity 272. The outer shell 2 includes at least two limiting portions 27, the outer shell 2 has a second limiting groove 28, the second limiting groove 28 is located between two adjacent limiting portions 27, and the second convex portion 42 is at least partially located in the second limiting groove 28. In some embodiments, the outer shell 2 has at least two second limiting grooves 28, the support member 4 includes at least two second convex portions 42, and the second limiting groove 28 corresponds to the second convex portion 42 one by one. The second limiting groove 28 limits the relative rotation of the support member 4 relative to the outer shell 2, and can play a role in positioning and limiting during the connection between the support member 4 and the outer shell 2.

[0054] In some embodiments, the detection assembly further includes other electronic components in addition to the gas detection probe 10. Related Art To facilitate the manufacture of the housing 2, the cavity 20 where the gas detection probe 10 is located is at the same height as the cavity 20 where other electronic components are located. Correspondingly, the housing portion for accommodating the gas detection probe 10 is at the same height as the housing portion for accommodating other electronic components. When the height of other electronic components is greater than that of the gas detection probe 10, in order to accommodate the electronic components, the cavity 20 is increased as a whole, resulting in a larger space occupied by the sensor as a whole.

[0055] A second aspect of the present application provides a gas sensor 100, for example Figure 3 As shown, it is beneficial to reduce the overall volume of the gas sensor 100. The gas sensor 100 provided in the present application includes a gas detection component 1 and a housing 2, wherein the gas detection component 1 includes a first electronic component 1001 and a second electronic component 1002, wherein the first electronic component 1001 includes a gas detection probe 10, and along the height direction H of the sensor, the height of the first electronic component 1001 is less than the height of the second electronic component 1002. The gas sensor 100 has an inner cavity 101, and the inner cavity 101 includes a first inner cavity 104 and a second inner cavity 105. The first inner cavity 104 is in communication with the external gas of the sensor, the first electronic component 1001 is located in the first inner cavity 104, and the second electronic component 1002 is located in the second inner cavity 105; the housing 2 includes a first shell portion 241 and a second shell portion 242, the first shell portion 241 is at least partially arranged around the first inner cavity 104, and the second shell portion 242 is at least partially arranged around the second inner cavity 105; along the height direction H of the sensor, the height of at least part of the first inner cavity 104 is less than the height of the second inner cavity 105, and the height of at least part of the first shell portion 241 is less than the height of the second shell portion 242. In some embodiments, for example Figure 3 As shown, the left side of the dotted line L surrounds the first inner cavity 104 , and the right side of the dotted line L surrounds the second inner cavity 105 .

[0056] In the present application, the gas detection component 1 includes a first electronic component 1001 and a second electronic component 1002, the first electronic component 1001 includes a gas detection probe 10, the height of the first electronic component 1001 is smaller than the second electronic component 1002, and correspondingly, the height of at least part of the first housing portion 241 for accommodating the first electronic component 1001 is smaller than the height of the second housing portion 242 for accommodating the second electronic component 1002. Compared with the related art in which the housing portion for accommodating the gas detection probe 10 and the housing portion for accommodating other electronic components are of the same height, the overall volume of the gas sensor 100 is reduced.

[0057] In some embodiments, the gas detection probe 10 is the first detection probe 11 described above, or the gas detection probe 10 includes the first detection probe 11 and the third detection probe 13 described above. The first inner cavity 104 includes the first cavity 102 and a portion of the second cavity 103 described above, and the second inner cavity 105 includes another portion of the second cavity 103, for example Figure 3 In some embodiments, the housing 2 includes a first cavity 203 and a second cavity 204, wherein the first cavity 203 is at least partially used to form the first inner cavity 104, and the second cavity 204 is at least partially used to form the second inner cavity 105. The first cavity 203 includes the first cavity 201 and a portion of the second cavity 202 described above, and the second cavity 204 includes another portion of the second cavity 202.

[0058] In some embodiments, the first housing portion 241 includes a first wall portion 231 and a third wall portion 233, and the second housing portion 242 includes a second wall portion 232 and a fourth wall portion 234. Along the height direction H of the sensor, the first wall portion 231 and the second wall portion 232 are located on the same side of the inner cavity 101, the third wall portion 233 and the fourth wall portion 234 are located on the same side of the inner cavity 101, the first wall portion 231 and the third wall portion 233 are respectively located on both sides of the first inner cavity 104, and the second wall portion 232 and the fourth wall portion 234 are respectively located on both sides of the second inner cavity 105, for example Figure 3 As shown. Along the height direction H of the sensor, the height of the first housing portion 241 is the distance between the first wall portion 231 and the third wall portion 233, and the height of the second housing portion 242 is the distance between the second wall portion 232 and the fourth wall portion 234. Along the height direction H of the sensor, the height of the first inner cavity 104 is h1, the height of the second inner cavity 105 is h2, the height of the first housing portion 241 is H1, the height of the second housing portion 242 is H2, the thickness of the first wall portion 231 is t1, the thickness of the second wall portion 232 is t2, the thickness of the third wall portion 233 is t3, and the thickness of the fourth wall portion 234 is t4, H1 = h1 + t1 + t3, H2 = h2 + t2 + t4, for example Figure 3 shown.

[0059] Specifically, along the height direction H of the sensor, at least a portion of the height of the first inner cavity 104 is smaller than the height of the second inner cavity 105. Figure 3 As shown, the height h1 of the first inner cavity 104 is the distance between the inner surface of the first wall portion 231 and the inner surface of the second wall portion 232 along the height direction H of the sensor, wherein the inner surface of the first wall portion 231 and the inner surface of the second wall portion 232 are both located at the periphery of the first inner cavity 104. The height h2 of the second inner cavity 105 is the distance between the inner surface of the third wall portion 233 and the inner surface of the fourth wall portion 234 along the height direction H of the sensor, wherein the inner surface of the third wall portion 233 and the inner surface of the fourth wall portion 234 are both located at the periphery of the second inner cavity 105.

[0060] The side wall 23 of the housing 2 described above includes a first wall portion 231, a second wall portion 232, a third wall portion 233 and a fourth wall portion 234. In some embodiments, the limiting portion 27 is connected to the first wall portion 231, for example Figure 3 shown.

[0061] In some embodiments, along a height direction H perpendicular to the sensor, the first housing portion 241 and the second housing portion 242 are arranged side by side, for example Figure 3 shown.

[0062] In some embodiments, the through hole 21 is connected to the first inner cavity 104, and the first wall portion 231 includes the through hole portion 22 described above. Along the height direction H of the sensor, the air hole 111 is close to the through hole portion 22 relative to the air chamber 113, and the through hole portion 22 is at least partially close to the gas detection probe 10 relative to the second wall portion 232. The overall height of the cavity 20 increases, resulting in an increase in the distance between the through hole 21 and the gas detection probe 10, which prolongs the time for the gas to reach the detection probe and reduces the time response of gas detection. In the present application, the air hole 111 is close to the through hole portion 22 relative to the air chamber 113, and the through hole portion 22 is at least partially close to the gas detection probe 10 relative to the second wall portion 232, reducing the distance between the through hole portion 22 and the gas detection probe 10. This solution helps to speed up the time response of gas detection on the basis of reducing the overall volume of the sensor.

[0063] In some embodiments, the first wall portion 231 includes a first sub-wall portion 2311 and a second sub-wall portion 2312, and the first sub-wall portion 2311 and the second wall portion 232 are both connected to the second sub-wall portion 2312; along the height direction H of the sensor, the second sub-wall portion 2312 is at least partially close to the second wall portion 232 relative to the first sub-wall portion 2311. The through hole portion 22 is partially disposed on the first sub-wall portion 2311, and the through hole portion 22 is partially disposed on the second sub-wall portion 2312. The through hole portion 22 has a first side surface 221 and a second side surface 222, the second side surface 222 is located at the periphery of the first inner cavity 104, the second side surface 222 is close to the gas detection probe 10 relative to the first side surface 221, and the through hole 21 passes through the first side surface 221 and the second side surface 222. The first side surface 221 includes a first sub-side surface 2211 and a second sub-side surface 2212, the first sub-wall portion 2311 includes a first sub-side surface 2211, and the second sub-wall portion 2312 includes a second sub-side surface 2212. The second side surface 222 is a plane; along the height direction H of the sensor, the distance between at least part of the second sub-side surface 2212 and the second side surface 222 is greater than the distance between the first sub-side surface 2211 and the second side surface 222. Specifically, for example Figure 3 and Fig.13 As shown, the portion of the through hole portion 22 located at the first sub-wall portion 2311 is in a flat plate shape, and its thickness is constant along the height direction H of the sensor. Along the height direction H of the sensor, the thickness of the portion of the through hole portion 22 located at the second sub-wall portion 2312 gradually increases from the first sub-wall portion 2311 to the second wall portion 232. In this way, it is beneficial to keep the second side surface 222 as a plane, and facilitate the connection between the through hole portion 22 and the waterproof breathable membrane 5, the support member 4 and the guide member 3.

[0064] In some embodiments, the waterproof breathable membrane 5 and the support member 4 are both located in the inner cavity 101, the support member 4 is connected to the second side surface 222, and the waterproof breathable membrane 5 is clamped between the support member 4 and the second side surface 222. The support member 4 is in the shape of a flat plate, for example Figure 3 As shown, the support member 4 and the second side surface 222 are fixedly connected by at least one of welding (eg, laser welding, friction welding, resistance welding) and bonding.

[0065] Specifically, for example Figure 3 , Fig.10 and Fig.11As shown, the support member 4 has a first connection surface 441 and a second connection surface 442. Along the height direction H of the sensor, the first connection surface 441 is close to the through hole portion 22 relative to the second connection surface 442, and the air hole 43 runs through the first connection surface 441 and the second connection surface 442. In some embodiments, the first connection surface 441 is connected to the waterproof breathable membrane 5, and the second connection surface 442 is connected to the guide member 3. The support member 4 has a connection portion 45, the connection portion 45 is connected to the first connection surface 441, and the connection portion 45 protrudes from the first connection surface 441, and the connection portion 45 is located at the periphery of the first connection surface 441. In some embodiments, the waterproof breathable membrane 5 is first connected to the first connection surface 441 of the support member 4, for example, by bonding, and the connection portion 45 is at least partially located at the periphery of the waterproof breathable membrane 5, and then the connection portion 45 of the support member 4 is fixedly connected to the second side surface 222 by at least one of laser welding, friction welding, resistance welding, and bonding. Of course, in some other embodiments, the waterproof breathable membrane 5 may be connected to the second side surface 222 first, and then the support member 4 may be connected to the second side surface 222 , so that the waterproof breathable membrane 5 is clamped between the support member 4 and the second side surface 222 .

[0066] In some embodiments, the first wall portion 231 includes a first wall surface 2313, and the first wall surface 2313 includes a first side surface 221; the housing 2 includes a blocking portion 29, the blocking portion 29 is connected to the first wall surface 2313, the blocking portion 29 protrudes from the first wall surface 2313, and the blocking portion 29 is located on the peripheral side of the through hole portion 22. Figure 3 As shown, the surface of the first wall portion 231 has an inclination, specifically, the first sub-wall portion 2311 is low, the second wall portion 232 is high, and the second sub-wall portion 2312 extends from the high second wall portion 232 to the low first sub-wall portion 2311, that is, the housing 2 has a sloped second sub-wall portion 2312. The blocking portion 29 can at least reduce the impurities flowing along the slope to the through-hole portion 22. The second wall portion 232 includes a second wall surface 2321, a first wall surface 2313 is partially a curved surface, and the second wall surface 2321 is a plane, and the first wall surface 2313 is connected to the second wall surface 2321; along the height direction H of the sensor, the first wall surface 2313 is at least partially close to the first detection probe 11 relative to the second wall surface 2321.

[0067] In some embodiments, the through hole portion 22 is circular; the through hole portion 22 has a plurality of through holes 21, and the through holes 21 include regular hexagonal holes. Figure 1 As shown, the circular through hole portion 22 is provided with a regular hexagonal through hole 21, which not only enables the through hole portion 22 to have a higher strength, but also enables the flow area of ​​the through hole 21 to be larger than the area of ​​the through hole portion 22, so that more gas can enter the first inner cavity 104 through the through hole 21 in the same time. Specifically, for example Figure 1As shown, the through holes 21 included in the through hole portion 22 may not all be regular hexagons, and some of the through holes 21 may have an incomplete regular hexagonal shape.

[0068] In some embodiments, the first electronic component 1001 and the second electronic component 1002 are both electrically connected to the circuit board 14. Along the height direction H of the sensor, the first electronic component 1001 is at least partially located at the same side of the circuit board 14 as the second electronic component 1002, the first electronic component 1001 is at least partially close to the first wall portion 231 relative to the circuit board 14, and the second electronic component 1002 is at least partially close to the second wall portion 232 relative to the circuit board 14; the third wall portion 233 is at least partially parallel to the circuit board 14, and the fourth wall portion 234 is at least partially parallel to the circuit board 14, for example Fig.15 and Fig.16 As shown, the shapes of the third wall portion 233 and the fourth wall portion 234 match the circuit board 14, which is beneficial to reducing the waste of the internal space of the sensor.

[0069] In some embodiments, the circuit board 14 includes a first board portion 141 and a second board portion 142, and the first board portion 141 is connected to the second board portion 142. The gas detection probe 10 is physically and electrically connected to the first board portion 141, and the second electronic component 1002 is physically and electrically connected to the second board portion 142. The circuit board 14 has a through groove 143, and the through groove 143 penetrates the circuit board 14 along the thickness direction of the circuit board 14; the through groove 143 is located at the periphery of the first board portion 141, and along the direction perpendicular to the thickness of the circuit board 14, the through groove 143 is at least partially located between the first board portion 141 and the second board portion 142, for example Fig.17 The through slot 143 is conducive to heat insulation between the gas detection probe 10 and the electronic components installed on the second board portion 142, reducing the influence of the electronic components installed on the second board portion 142 on the gas detection probe 10, and is conducive to improving the gas detection accuracy. In some embodiments, the circuit board 14 has at least two through slots 143, such as Fig.17 shown.

[0070] In some embodiments, the circuit board 14 has a first board surface 144 and a second board surface 145. Along the thickness direction of the circuit board 14, the first board surface 144 and the second board surface 145 are respectively located on two sides of the circuit board 14. Figure 3As shown. The first board surface 144 is close to the through hole portion 22 relative to the second board surface 145, and the first detection probe 11, the second detection probe 12 and the third detection probe 13 are all installed on the first board surface 144. The first electronic component 1001 and the second electronic component 1002 are both installed on the first board surface 144. In some embodiments, along the height direction H of the sensor, there is a gap between the second board surface 145 and the housing 2, and the second board surface 145 is installed with electronic components. In some embodiments, the circuit board 14 is fixedly connected or limitedly connected to the housing 2.

[0071] In some embodiments, for example Figure 3-4 , combined with Figures 12-14 and Figures 15-16 As shown, the housing 2 includes a first housing 25 and a second housing 26, and at least a portion of the first housing 25 and at least a portion of the second housing 26 are both located at the periphery of the cavity 20. The first housing 25 and the second housing 26 have a first state and a second state. In the first state, the first housing 25 is separated from the second housing 26; in the second state, the first housing 25 is fixedly connected or limitedly connected to the second housing 26, and the first housing 25 is sealedly connected to the second housing 26. The first housing 25 includes a top wall 251 and a first peripheral wall 252, and the top wall 251 includes a first wall portion 231 and a second wall portion 232; the first peripheral wall 252 is connected to the peripheral side of the top wall 251. The second housing 26 includes a bottom wall 261 and a second peripheral wall 262, and the bottom wall 261 includes a third wall portion 233 and a fourth wall portion 234, and the second peripheral wall 262 is connected to the peripheral side of the bottom wall 261. Along the height direction H of the sensor, the top wall 251 and the bottom wall 261 are respectively located on both sides of the cavity 20. In the second state, the first peripheral wall 252 is fixedly connected or position-limitedly connected to the second peripheral wall 262, and the first peripheral wall 252 is sealedly connected to the second peripheral wall 262. In some embodiments, the first housing 25 is an integral piece, and the second housing 26 is an integral piece. For example, the first housing 25 and the second housing 26 are both components formed by integral injection molding. The detection assembly and the flow guide 3 are both located in the cavity 20 enclosed by the first housing 25 and the second housing 26.

[0072] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A gas sensor, comprising a gas detection component, a housing and a flow guide, characterized in that: The gas detection assembly includes a first detection probe and a second detection probe, the first detection probe includes a gas detection probe, and the second detection probe includes at least one of a temperature detection probe, a humidity detection probe and a pressure detection probe; The first detection probe has an air chamber and an air hole, the air hole is connected to the air chamber, and the air chamber is connected to the external gas of the sensor; the first detection probe includes a detection shell, the detection shell is at least partially located outside the air chamber, the detection shell has an air hole portion, and the air hole is arranged in the air hole portion; The gas sensor has an inner cavity, the outer shell is at least partially located on the periphery of the inner cavity, the gas detection component and the flow guide are at least partially located in the inner cavity; the inner cavity includes a first cavity and a second cavity, the first cavity is connected to the outside of the sensor, the flow guide is at least partially located on the periphery of the first cavity, and the flow guide is at least partially located on the periphery of the second cavity; the air hole portion is at least partially located on the periphery of the first cavity; The second detection probe is at least partially located at the periphery of the first cavity; or, the first cavity is communicated with the second cavity, and the second detection probe is at least partially located in the second cavity.

2. The gas sensor according to claim 1, characterized in that The flow guide has a drainage hole, the drainage hole passes through the flow guide, the drainage hole is connected with the first cavity, and the drainage hole is connected with the second cavity; The flow guide member comprises a drainage hole portion, the drainage hole portion comprises the drainage hole and a drainage hole wall, and the drainage hole wall is located at the periphery of the drainage hole; A first plane perpendicular to the height direction of the sensor is defined as a projection plane. Along the height direction of the sensor, the orthographic projection of the drainage hole portion on the projection plane is a first projection. The orthographic projection of the second detection probe on the projection plane is a second projection. The second projection is at least partially located within the outer contour of the first projection.

3. The gas sensor according to claim 2, characterized in that The housing has a through hole, the through hole is in communication with the outside of the sensor, the through hole is in communication with the first cavity, the housing includes a through hole portion, the through hole is arranged in the through hole portion; The drainage hole portion includes a first orifice portion, and the drainage hole includes a first orifice; the first orifice portion includes the first orifice and a first orifice wall, and the first orifice wall is located at the periphery of the first orifice; The flow guide member has a flow guide surface, the flow guide surface is at least partially located at the periphery of the first cavity, and the first orifice is located on the flow guide surface; Along the height direction of the sensor, the orthographic projection of the through hole portion on the projection plane is a third projection, the orthographic projection of the first orifice portion on the projection plane is a fourth projection, and the fourth projection is at least partially located within the outer contour of the third projection.

4. The gas sensor according to claim 3, characterized in that The flow guide comprises a main body and a drainage part, wherein the drainage part is connected to the main body, the drainage part protrudes from the main body, and the drainage hole passes through the main body and the drainage part; The main body has the first orifice; the drainage hole includes a second orifice, the drainage portion has the second orifice, the second orifice is farther away from the first cavity than the first orifice, and the second orifice is closer to the second detection probe than the first orifice; Along the height direction of the sensor, the through hole penetrates the side wall of the shell, and the drainage hole penetrates the flow guide; the extension direction of the through hole is parallel to the extension direction of the drainage hole.

5. The gas sensor according to claim 4, characterized in that The gas detection assembly includes a circuit board, the first detection probe and the second detection probe are both electrically connected to the circuit board, and the height direction of the sensor is parallel to the thickness direction of the circuit board; Along the height direction of the sensor, the guide member is located on one side of the circuit board, and at least a portion of the first detection probe, at least a portion of the second detection probe, and the guide member are located on the same side of the circuit board; Along the height direction of the sensor, the drainage portion is closer to the circuit board relative to the main body, and there is a distance between the drainage portion and the circuit board.

6. The gas sensor according to claim 2, characterized in that The guide member comprises a top, a bottom and a transition portion, the top and the bottom are both connected to the transition portion, and along the height direction of the sensor, the transition portion is closer to the top relative to the bottom; The top is connected to the shell; the bottom has a through hole, the through hole passes through the guide member, and the first detection probe is at least partially located in the through hole; The top portion includes a first surface, the bottom portion includes a second surface, and the transition portion includes a third surface. Along the height direction of the sensor, the first surface, the second surface, and the third surface are located on the same side of the guide member, and at least a portion of the second surface and at least a portion of the third surface are located at the periphery of the first cavity. The first surface and the second surface are both connected to the third surface, and at least a part of the third surface is an arc surface; The drainage hole includes a first orifice extending through the third surface.

7. The gas sensor according to claim 6, characterized in that The third surface has a first point and a second point, and along the height direction of the sensor, the first point is farther from the bottom than the second point; A second plane perpendicular to the height direction of the sensor is defined as a cross section, the cross section includes a first cross section and a second cross section, the first point is located in the first cross section, and the second point is located in the second cross section; the first cross section intersects with the third surface to obtain a first loop line, the second cross section intersects with the third surface to obtain a second loop line, the surface enclosed by the first loop line in the first cross section is a first surface, the surface enclosed by the second loop line in the second cross section is a second surface, and the area of ​​the first surface is greater than the area of ​​the second surface.

8. The gas sensor according to claim 7, characterized in that The first loop line and the second loop line are both circular loops, the radius of the first loop line is greater than the radius of the second loop line, and the first loop line is coaxial with the second loop line; the first loop line has a first circle point, the second loop line has a second circle point, and a line connecting the first circle point and the second circle point is parallel to the height direction of the sensor; The third surface has a top and a bottom, the top is connected to the first surface, and the bottom is connected to the second surface; the first point is located at the top, and the second point is located at the bottom; the ratio of the area of ​​the first surface to the area of ​​the second surface is 2 to 4; Along the height direction of the sensor, the distance between the first point and the second point is the height of the guide member, and the ratio of the height of the guide member to the diameter of the second surface is 3 to 5; A third plane parallel to the height direction of the sensor is defined as a cutting plane, the cutting plane intersects with the second surface to obtain a first tangent line, the cutting plane intersects with the third surface to obtain a second tangent line, the first tangent line and the second tangent line are both straight lines, and the angle between the first tangent line and the second tangent line is 30° to 60°.

9. The gas sensor according to any one of claims 1 to 8, characterized in that: The housing has a cavity, the flow guide is at least partially located in the cavity, and the gas detection component is at least partially located in the cavity; the cavity is at least partially used to form the first cavity, and the cavity is at least partially used to form the second cavity; The housing comprises a side wall and a limiting portion, the through hole passes through the side wall, the side wall comprises a through hole portion, and the through hole is arranged in the through hole portion; the limiting portion is connected to the side wall, the limiting portion is located in the receiving cavity, the receiving cavity comprises a limiting cavity, the limiting portion is located at the periphery of the limiting cavity, and the through hole is communicated with the limiting cavity; The flow guide is at least partially located in the limiting cavity, and the flow guide is fixedly connected or limitedly connected to the limiting portion.

10. The gas sensor according to claim 9, characterized in that The sensor comprises a support member and a waterproof breathable membrane, wherein the support member and the waterproof breathable membrane are both located in the cavity, and the waterproof breathable membrane is at least partially clamped between the through hole portion and the support member; Along the height direction of the sensor, the support member is at least partially close to the through hole portion relative to the flow guide member, the support member is at least partially located in the limiting cavity, and the support member is fixedly connected or limitedly connected to the limiting portion.

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