Sensor

Abstract

The sensor comprises a detection assembly, and the detection assembly comprises a gas detection probe and a circuit board; the gas detection probe is provided with a first gas hole and a gas chamber which are communicated. The sensor comprises an explosion-proof shell and a flow guide part, wherein the explosion-proof shell comprises a metal material or a ceramic material. The sensor is provided with a cavity, and the explosion-proof shell is at least partially located on the periphery of the cavity. The cavity comprises a first cavity and a second cavity, the flow guide part is at least partially located on the periphery of the first cavity, the first air hole part is at least partially located on the periphery of the first cavity, the first cavity is in gas communication with the outside of the sensor, and the first air hole is communicated with the first cavity; the diversion part is at least partially positioned at the periphery of the second cavity; and the flow guide piece is fixedly connected or in limited connection with at least one of the explosion-proof shell and the detection assembly. The sensor comprises an explosion-proof shell and a flow guide piece. The explosion-proof shell enables the sensor to have an explosion-proof function, and the flow guide piece accelerates the response of the sensor to target gas.

Description

Technical Field

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

[0002] The sensor includes a detection component, which includes a gas detection probe, which can be used to detect the target gas. The sensor also includes a housing, in which the detection component is accommodated. In order to speed up the sensor's response to the target gas, the related art sets a flow guide in the housing. However, the sensor of the related art does not have an explosion-proof function, and there is a risk of causing the target gas to burn when the detected target gas is flammable. Summary of the invention

[0003] The purpose of the present application is to provide a sensor with fast response and explosion-proof function.

[0004] The sensor provided in the present application includes a detection component, wherein the detection component includes a gas detection probe and a circuit board, and the gas detection probe is electrically connected to the circuit board;

[0005] The gas detection probe has a first air hole and an air chamber, the first air hole is connected to the air chamber, the gas detection probe includes a first air hole portion, the first air hole portion is located at the periphery of the air chamber, and the first air hole is arranged in the first air hole portion;

[0006] The sensor comprises a flameproof housing and a flow guide, wherein the flameproof housing comprises a metal material or a ceramic material; the sensor has a cavity, wherein the flameproof housing is at least partially located at the periphery of the cavity; the cavity comprises a first cavity and a second cavity, wherein the flow guide is at least partially located at the periphery of the first cavity, wherein the first air hole portion is at least partially located at the periphery of the first cavity, wherein the first cavity is in gaseous communication with the outside of the sensor, and wherein the first air hole is in communication with the first cavity; wherein the flow guide is at least partially located at the periphery of the second cavity;

[0007] The flow guide is fixedly connected or position-limitedly connected to at least one of the flameproof enclosure and the detection assembly.

[0008] The sensor of the present application includes a flameproof housing and a flow guide. The flameproof housing includes a metal material or a ceramic material, so that the sensor has a flameproof function. 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 first cavity is at least partially separated from the second cavity by the flow guide, which can reduce the diffusion of the target gas into the second cavity, so that the target gas can enter the gas chamber through the first air hole after entering the first cavity, thereby accelerating the response of the sensor to the target gas. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1is a three-dimensional diagram of a sensor provided in one embodiment of the present application;

[0010] Figure 2 is an exploded schematic diagram of a sensor provided in one embodiment of the present application;

[0011] Figure 3 is a cross-sectional schematic diagram of a sensor provided in one embodiment of the present application;

[0012] Figure 4 is a cross-sectional schematic diagram of a sensor provided in one embodiment of the present application;

[0013] Figure 5 is a three-dimensional diagram of a first shell provided in one embodiment of the present application;

[0014] Figure 6 is a schematic top view of a first shell provided in one embodiment of the present application;

[0015] Figure 7 is a cross-sectional schematic diagram of a first shell provided in one embodiment of the present application;

[0016] Figure 8 is a three-dimensional diagram of a second housing provided in one embodiment of the present application;

[0017] Fig. 9 is a three-dimensional diagram of a second housing provided in another embodiment of the present application;

[0018] Fig.10 is a three-dimensional diagram of a flow guide provided in another embodiment of the present application;

[0019] Fig.11 is a three-dimensional diagram of a flow guide provided in another embodiment of the present application;

[0020] Fig.12 is a top view of a flow guide provided in another embodiment of the present application;

[0021] Fig.13 It is a cross-sectional schematic diagram of a detection component provided in another embodiment of the present application. DETAILED DESCRIPTION

[0022] 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.

[0023] 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.

[0024] The sensor includes a detection component, which includes a gas detection probe, which can be used to detect the target gas. The sensor also includes a housing, in which the detection component is accommodated. In order to speed up the sensor's response to the target gas, the related art sets a flow guide in the housing. However, the sensor of the related art does not have an explosion-proof function, and there is a risk of causing the target gas to burn when the detected target gas is flammable.

[0025] The present application provides a sensor 1000, for example Figure 1 and Figure 2 As shown, the detection assembly 100 includes a gas detection probe 1 and a circuit board 101. The gas detection probe 1 is electrically connected to the circuit board 101. Fig.13 As shown, the gas detection probe 1 has a first air hole 15 and an air chamber 14, the first air hole 15 is connected to the air chamber 14, the gas detection probe 1 includes a first air hole portion 16, the first air hole portion 16 is located at the periphery of the air chamber 14, and the first air hole 15 is arranged in the first air hole portion 16. The sensor 1000 includes a flameproof housing 2 and a flow guide 3, the flameproof housing 2 includes a metal material or a ceramic material; the sensor 1000 has a cavity 1001, the flameproof housing 2 is at least partially located at the periphery of the cavity 1001; the cavity 1001 includes a first cavity 1002 and a second cavity 1003, the flow guide 3 is at least partially located at the periphery of the first cavity 1002, and the flow guide 3 is at least partially located at the periphery of the second cavity 1003; the first air hole portion 16 is at least partially located at the periphery of the first cavity 1002, the first cavity 1002 is gas-connected to the outside of the sensor 1000, and the first air hole 15 is connected to the first cavity 1002. The flow guide 3 is fixedly connected or position-limitedly connected to at least one of the flameproof enclosure 2 and the detection assembly 100 .

[0026] The sensor 1000 of the present application includes a flameproof housing 2 and a flow guide 3. The flameproof housing 2 includes a metal material or a ceramic material, so that the sensor 1000 has a flameproof function. The flow guide 3 is at least partially located on the periphery of the first cavity 1002, and the flow guide 3 is at least partially located on the periphery of the second cavity 1003. The first cavity 1002 is at least partially separated from the second cavity 1003 by the flow guide 3, which can reduce the diffusion of the target gas to the second cavity 1003, so that the target gas can enter the gas chamber 14 through the first air hole 15 after entering the first cavity 1002, thereby accelerating the response of the sensor 1000 to the target gas. When the target gas is flammable, the leakage of the electronic components inside the sensor 1000 or the sparks generated may detonate the target gas. The present application can reduce the risk of the sensor 1000 detonating the target gas through the flameproof housing 2.

[0027] In some embodiments, the flameproof enclosure 2 has an inner cavity 2010, the inner cavity 2010 of the flameproof enclosure 2 is at least partially used to form the cavity 1001, and the flow guide 3 is at least partially located in the inner cavity 2010. The inner cavity 2010 includes a first inner cavity 2011 and a second inner cavity 2012, and along the height direction H of the sensor 1000, the flow guide 3 is at least partially located between the first inner cavity 2011 and the second inner cavity 2012. For example Figure 3 and Figure 4 As shown, the flow guide 3 separates at least part of the first inner cavity 2011 from the second inner cavity 2012. The first inner cavity 2011 is at least partially used to form the first cavity 1002, and the second inner cavity 2012 is at least partially used to form the second cavity 1003. The first air hole portion 16 is at least partially located in the first inner cavity 2011, the gas detection probe 1 is at least partially located in the second inner cavity 2012, and the circuit board 101 is at least partially located in the second inner cavity 2012.

[0028] In some embodiments, at least part of the detection assembly 100 and at least part of the flow guide 3 are both located in the inner cavity 2010; the flameproof housing 2 includes a side wall 2013, and the side wall 2013 is located at the periphery of the inner cavity 2010. The flameproof housing 2 includes a protrusion 23, and the protrusion 23 is formed by protruding from the side wall 2013 in a direction away from the inner cavity 2010. The protrusion 23 is at least partially located at the periphery of the first cavity 1002, and the protrusion 23 has a second air hole 233, and the second air hole 233 gaseously connects the first cavity 1002 with the outside of the sensor 1000, and the protrusion 23 includes a second air hole portion 234, and the second air hole 233 is arranged at the second air hole portion 234, for example Figure 2 to Figure 4 As shown. The second pore portion 234 at least partially comprises a metal material or a ceramic material. In some embodiments, the second pore portion 234 is a metal mesh or a ceramic mesh, and the mesh of the metal mesh or the ceramic mesh is the second pore 233. In some embodiments, the second pore portion 234 is in the shape of a flat plate.

[0029] In some embodiments, the flameproof enclosure 2 includes a main body 24 and a second air hole 234, and the main body and the second air hole 234 are fixedly connected or positionally connected, such as by welding, bonding, or clamping. Figure 3 and Figure 4 As shown, the second pore portion 234 includes a first connection portion 2341, the main body 24 has a second connection portion 241, the first connection portion 2341 is located in the inner cavity 2010, and the second connection portion 241 is located at the periphery of the inner cavity 2010. A plane perpendicular to the height direction H of the sensor 1000 is defined as a first projection plane, and along the height direction H of the sensor, the orthographic projection of the first connection portion 2341 on the first projection plane coincides with the orthographic projection of the second connection portion 241 on the second projection plane. The main body 24 is made of cast iron or stainless steel, and the second pore portion 234 is a metal mesh or a ceramic mesh.

[0030] In some embodiments, the flameproof enclosure 2 includes a first shell 21 and a second shell 22, wherein the first shell 21 is at least partially located at the periphery of the inner cavity 2010, and the second shell 22 is at least partially located at the periphery of the inner cavity 2010. The first shell 21 is fixedly connected or position-limitedly connected to the second shell 22, and the first shell 21 is sealed to the second shell 22. The guide member 3 is partially clamped between the first shell 21 and the second shell 22, for example Figure 3 and Figure 4 As shown. In the related art, the sensor 1000 adopts a plastic shell, and taking advantage of the high elasticity of the plastic material, a snap-on structure is set in the shell so that the flow guide 3 can be snap-on with the first shell 21 or the second shell 22. In order to achieve explosion-proof of the sensor 1000, the shell of the present application includes metal or ceramic materials, and the metal parts or ceramic parts have greater strength and hardness and less elasticity. In order to achieve the connection between the shell and the flow guide 3, the present application reduces the difficulty of connecting the two by clamping, which is more suitable for the scene where the sensor 1000 has both the flow guide 3 and the explosion-proof shell 2.

[0031] Specifically, in some embodiments, for example Figure 3 to Figure 6 As shown, the first housing 21 has a first cavity 210, the first cavity 210 at least partially forms a first inner cavity 2011, and the first cavity 210 at least partially forms a second inner cavity 2012. The first cavity 210 at least partially forms a cavity 1001, and the flow guide 3 is at least partially located in the first cavity 210. The first housing 21 has a first bottom wall 211 and a first peripheral wall 212, the first bottom wall 211 is connected to the first peripheral wall 212, and at least a portion of the first bottom wall 211 and at least a portion of the first peripheral wall 212 are both located at the periphery of the first cavity 210; the first peripheral wall 212 has a first end 213 and a second end 214, the first end 213 is a free end, and the second end 214 is connected to the first bottom wall 211. The flow guide 3 is partially clamped between the first end 213 and the second housing 22.

[0032] In some embodiments, the first end 213 includes a first end surface 2131, and along the height direction H of the sensor 1000, the first end surface 2131 and the first bottom wall 211 are respectively located on both sides of the first cavity 210. The first shell 21 has a limiting groove 215, and the limiting groove 215 is formed by being recessed from the first end surface 2131 to the inside of the first shell 21; the first end 213 includes an outer wall surface 2132 and an inner wall surface 2133, and the inner wall surface 2133 is at least partially exposed to the first cavity 210, and along the direction perpendicular to the height of the sensor 1000, the outer wall surface 2132 is away from the first cavity 210 relative to the inner wall surface 2133. The limiting groove 215 passes through the inner wall surface 2133, and the guide member 3 is partially located in the limiting groove 215, and the guide member 3 is partially clamped between the groove bottom 2151 of the limiting groove 215 and the second shell 22. The first end surface 2131 abuts against the second shell 22, for example, in combination with Figure 3 and Figure 5 As shown, the limiting groove 215 can not only limit the longitudinal displacement (the height direction H of the sensor 1000 ) of the flow guide member 3 relative to the first housing 21 , but also limit the lateral displacement of the flow guide member 3 relative to the first housing 21 .

[0033] In some embodiments, the outer wall surface 2132 is provided with an external thread 219 for mating with the second housing 22. In some embodiments, the first end 213 has a receiving groove 218, which is formed by being recessed from the outer wall surface 2132 toward the inside of the first end 213, for example Figure 5 As shown. The sensor 1000 also includes a seal, which is at least partially accommodated in the accommodating groove 218. When the first shell 21 is connected to the second shell 22, the first shell 21 and the second shell 22 are both sealed and connected to the seal, so that a sealed connection between the first shell 21 and the second shell 22 can be achieved, reducing the risk of energy inside the sensor 1000 being transmitted to the outside through the gap between the first shell 21 and the second shell 22 to ignite the target gas.

[0034] In some embodiments, the first peripheral wall 212 has an abutment portion 216. Along the height direction H of the sensor 1000, the abutment portion 216 is close to the first bottom wall 211 relative to the first end 213, and the abutment portion 216 protrudes in a direction away from the first cavity 210 relative to the outer wall surface 2132, for example Figure 7 The abutting portion 216 has an abutting surface 217, and the abutting surface 217 is used to abut against the second shell 22, so as to limit the displacement of the second shell 22 relative to the first shell 21 along the height direction H of the sensor 1000. Of course, in some embodiments, the abutting surface 217 may not abut against the second shell 22, or even not contact the second shell 22.

[0035] In some embodiments, the first bottom wall 211 has an extension portion 2111, and along a height direction H perpendicular to the sensor 1000, the extension portion 2111 protrudes from the first peripheral wall 212. The extension portion 2111 has a mounting structure 2112, such as Figure 1 The notches or through holes shown facilitate the fixation of the sensor 1000 to other structures.

[0036] In some embodiments, the first housing 21 has a receiving portion 200, the receiving portion 200 is connected to the first peripheral wall 212, and the receiving portion 200 is located in the first cavity 210, or the receiving portion 200 protrudes from the first peripheral wall 212 to the first cavity 210. The receiving portion 200 contacts at least one of the detection component 100 and the flow guide 3, and the receiving portion 200 abuts against at least one of the detection component 100 and the flow guide 3. For example Figure 5 to Figure 7 As shown, the receiving portion 200 includes a first receiving portion 201 and a second receiving portion 202. Along the height direction H of the sensor, the first receiving portion 201 is close to the first bottom wall 211 relative to the guide member 3, and the first receiving portion 201 is used to support the guide member 3 or to limit the displacement of the guide member 3 relative to the first shell 21; along the height direction H of the sensor 1000, the second receiving portion 202 is close to the first bottom wall 211 relative to the second circuit board 103, and the second receiving portion 202 is used to support the second circuit board 103 or to limit the displacement of the second circuit board 103 relative to the first shell 21. In some embodiments, the receiving portion 200 includes at least two first receiving portions 201, and the receiving portion 200 includes at least two second receiving portions 202. Specifically, the first receiving portion 201 and the third receiving portion 203 may both have a sheet-like structure, for example Figure 5 shown.

[0037] In some embodiments, the first housing 21 has a third receiving portion 203, the third receiving portion 203 is close to the first bottom wall 211 relative to the circuit board 101, and the third receiving portion 203 is fixedly connected or position-limitedly connected to the circuit board 101. The third receiving portion 203 is close to the first bottom wall 211 relative to the second circuit board 103, and the third receiving portion 203 is fixedly connected or position-limitedly connected to the second circuit board 103. The third receiving portion 203 has a screw hole 2031, and the second circuit board 103 has a third positioning hole 105, and a bolt can be inserted into the third positioning hole 105 and the screw hole 2031, and the third receiving portion 203 and the second circuit board 103 are fixedly connected by the bolt.

[0038] In some embodiments, the second housing 22 has a second cavity 220, and the first housing 21 is at least partially located in the second cavity 220. The second housing 22 has a second bottom wall 221 and a second peripheral wall 222, the second bottom wall 221 is connected to the second peripheral wall 222, and at least a portion of the second bottom wall 221 and at least a portion of the second peripheral wall 222 are both located at the periphery of the second cavity 220; along the height direction H of the sensor 1000, at least a portion of the second peripheral wall 222 is close to the first bottom wall 211 relative to the second bottom wall 221. The first end surface 2131 is at least partially in contact with the second bottom wall 221, and the flow guide 3 is at least partially clamped between the groove bottom 2151 of the limiting groove 215 and the second bottom wall 221. At least a portion of the first housing 21 and the flow guide 3 are at least partially located at the periphery of the second inner cavity 2012, and at least a portion of the second housing 22 and the flow guide 3 are at least partially located at the periphery of the first inner cavity 2011.

[0039] In some embodiments, the second peripheral wall 222 has a third end 223 and a fourth end 224, the third end 223 is a free end, and the fourth end 224 is connected to the second bottom wall 221, for example Figure 8 and Fig. 9 When the first shell 21 is connected to the second shell 22, the third end 223 abuts against the abutment portion 216 of the first shell 21, for example Figure 3 and Figure 4 shown.

[0040] In some embodiments, the first peripheral wall 212 has an external thread 219, the second peripheral wall 222 has an internal thread 225, and the first peripheral wall 212 is threadedly connected to the second peripheral wall 222. Figure 3 and Figure 4 As shown, the second peripheral wall 222 has an inner wall surface 2211 and an outer wall surface 2221, the inner wall surface 2211 is at least partially exposed to the second cavity 220, and along the height direction H perpendicular to the sensor 1000, the outer wall surface 2221 is away from the second cavity 220 relative to the inner wall surface 2211. The inner wall surface 2211 is provided with an internal thread 225, which matches the external thread 219 provided on the outer wall surface 2132 of the first end 213 of the first shell 21, so as to achieve the threaded connection between the first shell 21 and the second shell 22. In some other embodiments, the first peripheral wall 212 is snap-fitted with the second peripheral wall 222. For example, the first end 213 of the first shell 21 is provided with a convex portion, which protrudes from the outer wall surface 2132 in a direction away from the first cavity 210, and the second shell 22 is provided with a groove, which is formed from the inner wall surface 2211 of the second shell 22 to the inside of the second shell 22. The convex portion is at least partially located in the concave groove, or the convex portion is interference-fitted with the groove wall of the concave groove, thereby achieving the snap connection between the first shell 21 and the second shell 22 .

[0041] Specifically, in some embodiments, for example Figure 8 and Fig. 9 As shown, the protrusion 23 is provided on the second housing 22. Along the height direction H of the sensor 1000, the protrusion 23 protrudes from the second bottom wall 221 to the direction away from the second peripheral wall 222. The protrusion 23 includes a third peripheral wall 231. Along the height direction H of the sensor 1000, at least part of the third peripheral wall 231 and the second peripheral wall 222 are respectively located on both sides of the second bottom wall 221. The protrusion 23 has a third cavity 230, which is communicated with the second cavity 220. The third cavity 230 has a first opening 2301, which is located at one end of the third cavity 230 away from the second cavity 220. The protrusion 23 includes a second pore portion 234, which is fixedly connected to the third peripheral wall 231, and the second pore portion 234 covers the first opening 2301. The second pore 233 is communicated with the third cavity 230. The third cavity 230 is at least partially used to form the first inner cavity 2011, and the third cavity 230 is at least partially used to form the first cavity 1002. In other words, for example Figure 3 and Figure 4 As shown, the first inner cavity 2011 includes the third cavity 230 , and the first cavity 1002 includes the third cavity 230 .

[0042] In some embodiments, the second housing 22 has a protruding portion 235, the protruding portion 235 is connected to the second bottom wall 221, and the protruding portion 235 is located in the second cavity 220. The third cavity 230 has a second opening 2302, and along the height direction H of the sensor 1000, the first opening 2301 and the second opening 2302 are respectively located at two ends of the third cavity 230. The protruding portion 235 is located outside the second opening 2302.

[0043] In some embodiments, the third cavity 230 includes a first sub-cavity 2303 and a second sub-cavity 2304. The first sub-cavity 2303 has a first opening 2301, and the second sub-cavity 2304 has a second opening 2302. The first sub-cavity 2303 is connected to the second sub-cavity 2304. Along the height direction H of the sensor, the inner diameter of the second sub-cavity 2304 gradually expands in a direction away from the first sub-cavity 2303, for example Figure 3 As shown, it is beneficial for gas to quickly pass through the third chamber 230 .

[0044] In some embodiments, for example Figure 8 As shown, the third peripheral wall 231 has an outer surface 232 , and the outer surface 232 is provided with threads or other connection structures for external devices, such as a calibration device.

[0045] In some embodiments, for example Fig.10 and Fig.11 As shown, the flow guide 3 includes a main body 31, and the main body 31 is at least partially located in the inner cavity 2010 of the flameproof enclosure 2, for example Figure 3and Figure 4 As shown. The body portion 31 includes a first opening 313 and a second opening 316. Along the height direction H of the sensor 1000, the first opening 313 is away from the second air hole 233 relative to the second opening 316. The first opening 313 includes a first opening 311 and a first wall 312, and the first wall 312 is located at the periphery of the first opening 311. The second opening 316 includes a second opening 314 and a second wall 315, and the second wall 315 is located at the periphery of the second opening 314. The body portion 31 has a flow guide cavity 310. Along the height direction H of the sensor 1000, the flow guide cavity 310 has a first opening 311 and a second opening 314. A plane perpendicular to the height direction H of the sensor 1000 is defined as a first projection plane. Along the height direction H of the sensor 1000, the orthographic projection of the first opening 313 on the first projection plane is a first projection, and the orthographic projection of the second opening 316 on the first projection plane is a second projection. The second projection is at least partially located within the outer contour of the first projection. The inner area surrounded by the first projection is S1, and the inner area surrounded by the second projection is S2, S1≤S2. That is, the first opening 311 is smaller than the second opening 314, so that the gas can quickly pass through the second opening 314 and the first opening 311 to reach the gas detection probe 1.

[0046] In some embodiments, along the height direction H of the sensor 1000, the orthographic projection of the first pore portion 16 on the first projection plane is the third projection, and the orthographic projection of the second pore portion 234 on the first projection plane is the fourth projection, the third projection is at least partially located within the outer contour of the first projection, and the fourth projection is at least partially located within the outer contour of the second projection. That is to say, the first pore portion 16 is at least partially aligned with the first port 311, and the second pore portion 234 is at least partially aligned with the second port 314. In this way, the gas can enter the guide cavity 310 through the second pore 233 and the second port 314. In some embodiments, the first port 313 is snap-fitted with the gas detection probe 1, and the first pore portion 16 is at least partially located in the guide cavity 310. In some embodiments, the second port 316 is located at the periphery of the protruding portion 235, and the protruding portion 235 is at least partially located in the first port 311.

[0047] In some embodiments, the body 31 has an outer side surface 317, and along a height direction H perpendicular to the sensor 1000, the outer side surface 317 is away from the flow guiding cavity 310 relative to the second opening 316. The outer side surface 317 at least partially cooperates with the outer side wall 2132, for example Figure 3 , Figure 4 and Fig.11As shown, the two are clearance-fitted or interference-fitted. The main body 31 includes a limiting portion 33, which protrudes from the outer side surface 317 in a direction away from the flow guiding cavity 310. Along the height direction H perpendicular to the sensor 1000, the limiting portion 33 is away from the flow guiding cavity 310 relative to the second opening 316. The limiting portion 33 is fixedly connected or limitedly connected to the flameproof housing 2. Specifically, for example Figure 3 and Figure 4 As shown, the limiting portion 33 is at least partially located in the limiting groove 215 , and the limiting portion 33 is at least partially clamped between the groove bottom 2151 of the limiting groove 215 and the second bottom wall 221 of the second shell 22 .

[0048] In some embodiments, the limiting portion 33 has an error-proof structure to reduce misassembly between the flow guide 3 and the first housing 21 when the two are assembled. Fig.12 As shown, the limiting portion 33 includes a first limiting portion 331 and a second limiting portion 332. Along the height direction H of the sensor 1000, the outer contour of the orthographic projection of the first limiting portion 331 on the first projection plane is a first outer contour 3311, and the outer contour of the orthographic projection of the second limiting portion 332 on the first projection plane is a second outer contour 3321. The curvature of the first outer contour 3311 is C1, and the curvature of the second outer contour 3321 is C2, C1>C2, or C1<C2. Correspondingly, the first housing 21 has a limiting groove 215 portion, and the limiting groove 215 portion includes the limiting groove 215 described above and a groove bottom 2151 and a groove wall 2152 located at the periphery of the limiting groove 215. The limiting groove 215 portion includes a first limiting groove portion 2153 and a second limiting groove portion 2154. The first limiting portion 331 is located inside the first limiting groove portion 2153, and the second limiting portion 332 is located inside the second limiting groove portion 2154. Along the height direction H of the sensor 1000, the outer contour of the orthographic projection of the first limiting groove portion 2153 on the first projection plane is a third outer contour 2155, the outer contour of the orthographic projection of the second limiting groove portion 2154 on the first projection plane is a fourth outer contour 2156, the curvature of the third outer contour 2155 is C3=C1, the curvature of the fourth outer contour 2156 is C4=C2, C3>C4, or C3<C4. For example Figure 6 As shown, the first outer contour 3311 and the third outer contour 2155 are both straight lines, and the second outer contour 3321 and the fourth outer contour 2156 are both curves, such as circular lines.

[0049] Specifically, in some embodiments, for example Figure 10 to Figure 12As shown, the main body 31 includes a main body 32, which is in the shape of a flat plate, and the limiting portion 33 and the second mouth portion 316 are both connected to the main body 32. Along the height direction H of the sensor 1000, the limiting portion 33 and the second mouth portion 316 extend from the main body 32 to the direction where the second pore portion 234 is located. There is a hollow structure between the limiting portion 33 and the second mouth portion 316, for example, as shown by X, the hollow structure is a groove located between the limiting portion 33 and the second mouth portion 316. The hollow structure can be used to save materials and reduce weight. In some embodiments, the guide 3 includes a reinforcing rib 4, the reinforcing rib 4 is at least partially located in the groove, and the reinforcing rib 4 connects the limiting portion 33 and the second mouth portion 316.

[0050] In some embodiments, the main body 31 is fixedly connected or position-limitedly connected to the gas detection probe 1. Figure 10 to Figure 12 As shown, the guide member 3 also includes a guide portion 34, which is connected to the main portion 32. Along the thickness direction of the main portion 32, the guide portion 34 and the second opening 316 are respectively located on both sides of the main portion 32, and the guide portion 34 is away from the second air hole portion 234 relative to the main portion 32. The thickness direction of the main portion 32 is in the same direction as the height direction H of the sensor 1000. The guide portion 34 includes a guide wall 341 and the first opening 313 described above, and the guide wall 341 is connected to the first wall 312 of the first opening 313, or in other words, the first wall 312 protrudes from the guide wall 341 to the guide cavity 310. One end of the guide wall 341 is connected to the first wall 312, and a surface perpendicular to the height direction H of the sensor 1000 is defined as a second projection surface, and the orthographic projection of the guide wall 341 on the second projection surface at least partially overlaps with the orthographic projection of the first wall 312 on the second projection surface. The orthographic projection of the first wall 312 on the second projection plane is located within the outer contour of the orthographic projection of the guide wall 341 on the second projection plane; the guide wall 341 is connected to a portion of the first wall 312 in a V-shape. In some embodiments, the guide portion 34 includes an elastic material, and the guide portion 34 is a sheet-like component made of plastic. The shape of the first port 311 is adapted to the gas detection probe 1. In some embodiments, the gas detection probe 1 is at least partially engaged with the first port 313, and the gas detection probe 1 and the first port 313 are clearance-matched.

[0051] In some embodiments, the flow guide 3 further includes a first positioning portion 35, the first positioning portion 35 is connected to the body portion 31, the first positioning portion 35 is fixedly connected or limitedly connected to the circuit board 101, and the first positioning portion 35 is at least partially located inside the flameproof enclosure 2, for example Figure 4As shown, the first positioning portion 35 is located in the second inner cavity 2012 of the flameproof enclosure 2. The first positioning portion 35 has a first positioning hole 351, the circuit board 101 has a second positioning hole 104, the sensor 1000 includes a positioning column (not shown), the positioning column is at least partially located in the first positioning hole 351, the positioning column is at least partially located in the second positioning hole 104, the positioning column is fixedly connected or limitedly connected to the first positioning portion 35, and the positioning column is fixedly connected or limitedly connected to the circuit board 101. The positioning column is, for example, a bolt.

[0052] In some embodiments, the guide member 3 includes a second positioning portion 36, and the second positioning portion 36 is at least partially located between two adjacent first receiving portions 201. The second positioning portion 36 cooperates with the first limiting portion 331 and the second limiting portion 332 of the guide member 3 to achieve error prevention when the guide member 3 is assembled with the first housing 21.

[0053] In order to reduce the radial dimension of the sensor 1000, in some embodiments, the circuit board 101 includes a first circuit board 102 and a second circuit board 103, the first circuit board 102 is electrically connected to the second circuit board 103, and the gas detection probe 1 is physically and electrically connected to the first circuit board 102. The sensor 1000 includes a wire 5, the second circuit board 103 is electrically connected to the wire 5, and the wire 5 is partially located outside the flameproof enclosure 2. Along the height direction H of the sensor 1000, the first circuit board 102 is close to the guide member 3 relative to the second circuit board 103. The sensor 1000 includes a connector 6, the connector 6 is a rigid member, and the connector 6 has a first end 61 and a second end 62, the first end 61 is fixedly connected or limitedly connected to the first circuit board 102, and the first end 61 is electrically connected to the first circuit board 102; the second end 62 is fixedly connected or limitedly connected to the second circuit board 103, and the second end 62 is electrically connected to the second circuit board 103. That is to say, along the height direction H of the sensor 1000 , the first circuit board 102 is closer to the guide member 3 than the second circuit board 103 , and the first circuit board 102 is mounted on the second circuit board 103 through the connecting member 6 .

[0054] In some embodiments, the first circuit board 102 is parallel to the second circuit board 103. Along the height direction H of the sensor 1000, the orthographic projection of the first circuit board 102 on the first projection plane at least partially overlaps with the orthographic projection of the second circuit board 103 on the second projection plane. The first positioning portion 35 of the guide member 3 is fixedly connected to the first circuit board 102 through a limit connection. For example Fig.11 As shown, the guide member 3 has at least two first positioning portions 35, and at least two first positioning portions 35 are connected to the first circuit board 102 by bolts (not shown). In this way, the guide member 3 is not only relatively fixed to the housing through the cooperation and clamping of the first shell 21 and the second shell 22, but also relatively fixed to the detection component 100 through the first positioning portions 35.

[0055] In some embodiments, the first circuit board 102 and the second circuit board 103 are both loosely matched with the side wall 2013 of the flameproof enclosure 2. Figure 3 and Figure 4 As shown, the first circuit board 102 and the second circuit board 103 are both loosely matched with the inner wall surface 2133 of the first housing 21. The second circuit board 103 has a notch 1031, and the wire 5 is at least partially located in the notch 1031. This facilitates the connection between the wire 5 and the second circuit board 103, for example Figure 2 shown.

[0056] In some embodiments, for example Fig.13 As shown, the gas detection probe 1 includes a detection shell 11, a light source part 12 and a detection part 13. The light source part 12 and the detection part 13 are both fixedly connected to the detection shell 11. The detection shell 11 is at least partially located outside the gas chamber 14. The detection shell 11 has a first air hole 15, and the first air hole 15 is connected to the gas chamber 14; the light source part 12 and the detection part 13 are both located outside the gas chamber 14. During detection, the light emitted by the light source passes through the gas chamber 14 and reaches the detection part 13. The light of the light source is, for example, infrared light, ultraviolet light, or other light whose parameters are affected by the gas to be detected. When the gas to be detected enters the gas chamber 14 through the first air hole 15, a certain parameter (such as intensity) of the light emitted by the light source is affected, and the parameter detected by the detector changes. For example, the gas to be detected is a refrigerant. When the refrigerant leaks and causes the parameter detected by the detector to change, it means that there is a refrigerant leak.

[0057] In some embodiments, for example Fig.13 As shown, the gas detection probe 1 includes a first connection circuit board 17 and a second connection circuit board 18. Along the length direction of the gas detection probe 1, the first connection circuit board 17 and the second connection circuit board 18 are respectively located at both ends of the detection housing 11. The first connection circuit board 17 is electrically connected to the light source part 12, and the second connection circuit board is electrically connected to the detection part 13. At least one of the detection housing 11 and the light source part 12 is fixedly connected or position-limitedly connected to the first connection circuit board 17, and at least one of the detection housing 11 and the detection part 13 is fixedly connected or position-limitedly connected to the second connection circuit board 18. The first connection circuit board 17 is fixedly connected or position-limitedly connected to the first circuit board 102, and the second connection circuit board 18 is fixedly connected or position-limitedly connected to the first circuit board 102.

[0058] 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 sensor, comprising a detection component, wherein the detection component comprises a gas detection probe and a circuit board, wherein the gas detection probe is electrically connected to the circuit board, characterized in that: The gas detection probe has a first air hole and an air chamber, the first air hole is connected to the air chamber, the gas detection probe includes a first air hole portion, the first air hole portion is located at the periphery of the air chamber, and the first air hole is arranged in the first air hole portion; The sensor comprises a flameproof housing and a flow guide, wherein the flameproof housing comprises a metal material or a ceramic material; the sensor has a cavity, wherein the flameproof housing is at least partially located at the periphery of the cavity; the cavity comprises a first cavity and a second cavity, wherein the flow guide is at least partially located at the periphery of the first cavity, and wherein the flow guide is at least partially located at the periphery of the second cavity; the first air hole portion is at least partially located at the periphery of the first cavity, wherein the first cavity is in gas communication with the outside of the sensor, and wherein the first air hole is in communication with the first cavity; The flow guide is fixedly connected or position-limitedly connected to at least one of the flameproof enclosure and the detection assembly.

2. The sensor according to claim 1, characterized in that The flameproof enclosure comprises a first shell and a second shell, the first shell is positionally connected or fixedly connected to the second shell, and the first shell is sealed to the second shell; The guide member portion is clamped between the first shell and the second shell.

3. The sensor according to claim 2, characterized in that The first shell has a first cavity, the first cavity at least partially forms the cavity, and the flow guide is at least partially located in the first cavity; The first shell has a first bottom wall and a first peripheral wall, the first bottom wall is connected to the first peripheral wall, and at least a portion of the first bottom wall and at least a portion of the first peripheral wall are both located at the periphery of the first cavity; The first peripheral wall has a first end, and the first end is a free end; the guide member is partially clamped between the first end and the second shell; The first end includes a first end face, the first shell has a limiting groove, the limiting groove is formed by being recessed from the first end face toward the inside of the first end, the guide member is partially located in the limiting groove, and the guide member is partially clamped between the bottom of the limiting groove and the second shell; the first end face is at least partially in contact with the second shell.

4. The sensor according to claim 3, characterized in that The second shell has a second cavity, and the first shell is at least partially located in the second cavity; The second shell has a second bottom wall and a second peripheral wall, the second bottom wall is connected to the second peripheral wall, and at least a portion of the second bottom wall and at least a portion of the second peripheral wall are both located at the periphery of the second cavity; Along the height direction of the sensor, the second peripheral wall is at least partially close to the first bottom wall relative to the second bottom wall; The first end surface is at least partially in contact with the second bottom wall, and the flow guide is at least partially clamped between the bottom of the limiting groove and the second bottom wall; The first circumferential wall has an external thread, the second circumferential wall has an internal thread, and the first circumferential wall is threadedly connected to the second circumferential wall; or, the first circumferential wall is clamped to the second circumferential wall.

5. The sensor according to any one of claims 1 to 4, characterized in that: The flameproof enclosure has an inner cavity, the inner cavity of the flameproof enclosure is at least partially used to form the cavity, the detection assembly and the flow guide are at least partially located in the inner cavity; the flameproof enclosure includes a side wall, and the side wall is located at the periphery of the inner cavity; The flameproof housing includes a protrusion, which is formed by protruding from the side wall in a direction away from the inner cavity; the protrusion is at least partially located at the periphery of the first cavity, the protrusion has a second air hole, the second air hole gaseously connects the first cavity with the outside of the sensor, the protrusion includes a second air hole portion, and the second air hole is arranged in the second air hole portion; The second pore portion at least partially includes a metal material or a ceramic material.

6. The sensor according to claim 1, characterized in that The flow guide comprises a body portion, wherein the body portion is at least partially located within the flameproof enclosure, the body portion comprises a first opening portion and a second opening portion, the first opening portion comprises a first opening and a first wall, the first wall is located at the periphery of the first opening, the second opening portion comprises a second opening and a second wall, and the second wall is located at the periphery of the second opening; The main body has a flow guiding cavity, and the flow guiding cavity has the first opening and the second opening; A 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 first mouth on the projection plane is a first projection, the orthographic projection of the second mouth 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; The inner area enclosed by the first projection is S1, and the inner area enclosed by the second projection is S2, where S1≤S2.

7. The sensor according to claim 6, characterized in that The main body has an outer side surface and a limiting portion. Along a height direction perpendicular to the sensor, the outer side surface is away from the flow guiding cavity relative to the second mouth portion. The limiting portion protrudes from the outer side surface in a direction away from the flow guiding cavity. The limiting portion is fixedly connected or limitedly connected to the flameproof enclosure. The limiting portion includes a first limiting portion and a second limiting portion. Along the height direction of the sensor, the outer contour of the orthographic projection of the first limiting portion on the first projection plane is a first outer contour, and the outer contour of the orthographic projection of the second limiting portion on the first projection plane is a second outer contour. The curvature of the first outer contour is C1, and the curvature of the second outer contour is C2, C1>C2, or C1<C2.

8. The sensor according to claim 6, characterized in that The flow guide comprises a first positioning portion, the first positioning portion is at least partially located inside the flameproof housing, the first positioning portion is connected to the main body, and the first positioning portion is fixedly connected or limitedly connected to the circuit board; The first positioning portion has a first positioning hole, the circuit board has a second positioning hole, the sensor includes a positioning column, the positioning column is at least partially located in the first positioning hole, the positioning column is at least partially located in the second positioning hole, the positioning column is fixedly connected or limitably connected to the first positioning portion, and the positioning column is fixedly connected or limitably connected to the circuit board.

9. The sensor according to claim 1, characterized in that The circuit board includes a first circuit board and a second circuit board, the first circuit board is electrically connected to the second circuit board, and the gas detection probe is physically and electrically connected to the first circuit board; the sensor includes a wire, the second circuit board is electrically connected to the wire, and the wire is partially located outside the flameproof enclosure; Along the height direction of the sensor, the first circuit board is closer to the guide member than the second circuit board; The sensor includes a connecting member, which has a first end and a second end. The first end is fixedly connected or limitably connected to the first circuit board, and the first end is electrically connected to the first circuit board; the second end is fixedly connected or limitably connected to the second circuit board, and the second end is electrically connected to the second circuit board.

10. The sensor according to claim 1, characterized in that The flameproof enclosure has an inner cavity, the flow guide is at least partially located in the inner cavity, the inner cavity includes a first inner cavity and a second inner cavity, the flow guide is at least partially located between the first inner cavity and the second inner cavity; the first inner cavity is at least partially used to form a first cavity, and the second inner cavity is at least partially used to form a second cavity; The first air hole portion is at least partially located in the first inner cavity, the gas detection probe is at least partially located in the second inner cavity, and the circuit board is at least partially located in the second inner cavity.

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