Gas detection device

Abstract

The gas detection device comprises a shell, a detection assembly, a blocking part and a shell part, and the blocking part and the shell part are both located in the shell; the shell is provided with a first communicating hole, the blocking part is provided with a diffusion cavity, the first communicating hole is communicated with external gas of the gas detection device, and the first communicating hole is communicated with gas of the diffusion cavity; the shell part is provided with a second communication hole and a detection cavity, the detection assembly is at least partially located in the detection cavity, and the second communication hole is communicated with the detection cavity; the diffusion cavity is provided with an air inlet and a bottom opening; in the height direction of the gas detection device, the gas inlet is closer to the first communication hole relative to the bottom opening, the flow area of the gas inlet is larger than that of the bottom opening, and at least part of the second communication hole is located in the bottom opening. The response speed of the gas detection device can be increased.

Description

Technical Field

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

[0002] A gas detection sensor is a converter that converts the concentration of a certain gas into a corresponding electrical signal.

[0003] A gas detection device of the related technology includes a shell, a light source, a detection probe, a shell part and a first circuit board, the shell part and the first circuit board are both located in the shell, the shell part has a detection cavity, the light source and the detection probe are at least partially located in the detection cavity, the detection probe is used to receive light from the light source, the shell part has a first connecting hole, the shell part has a diffusion cavity, the first connecting hole is connected to the diffusion cavity, the side walls of the diffusion cavity are parallel to the height direction of the gas detection device, the shell part has a second connecting hole, the shell part is at least partially located in the diffusion cavity, and the second connecting hole is at least partially located in the diffusion cavity.

[0004] The main principle is that different gases have different absorption rates of infrared light. The detection probe can calculate the concentration of the target gas and other information by detecting different light intensities.

[0005] The side walls of the diffusion cavity are parallel to the height direction of the gas detection device. After entering the diffusion cavity through the first connecting hole, it is not possible to enter the detection cavity through the second connecting hole in time, resulting in a slower response speed of the gas detection device. Since the solution in which the side walls of the diffusion cavity are parallel to the height direction of the gas detection device cannot meet the demand, how to improve the response speed of the gas detection device has become a technical problem that needs to be solved urgently. Summary of the invention

[0006] The gas detection device provided in the present application includes an outer shell, a detection component, a blocking part and a shell part, wherein the blocking part and the shell part are both located inside the outer shell; the outer shell has a first connecting hole, and the blocking part has a diffusion cavity, the first connecting hole is connected to the external gas of the gas detection device, and the first connecting hole is connected to the gas of the diffusion cavity; the shell part has a second connecting hole and a detection cavity, the detection component is at least partially located in the detection cavity, and the second connecting hole is connected to the detection cavity; the diffusion cavity has an air inlet and a bottom port; along the height direction of the gas detection device, the air inlet is closer to the first connecting hole than the bottom port, the flow area of ​​the air inlet is larger than the flow area of ​​the bottom port, and the second connecting hole is at least partially located at the bottom port.

[0007] In the present application, since the flow area of ​​the air inlet is larger than the flow area of ​​the bottom port, after the detected gas enters the air inlet, most of the detected gas will be guided to converge at the bottom port and enter the detection cavity for detection, thereby improving the response speed of the gas detection device. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a three-dimensional diagram of the gas detection device of the present application.

[0009] Figure 2 yes Figure 1 A three-dimensional cross-sectional view is used to show the structure inside the shell.

[0010] Figure 3 yes Figure 2 An exploded view of the casing portion, used to show the housing portion, the blocking portion and the interference portion.

[0011] Figure 4 yes Figure 1 A three-dimensional view of the upper shell, the blocking portion and the shell portion.

[0012] Figure 5 yes Figure 4 The three-dimensional diagram of the shell portion hidden in the middle and behind the shell portion is used to show the structure of the interference portion.

[0013] Figure 6 yes Figure 5 The three-dimensional diagram after hiding the interference part is used to show the second slot body and the first connecting hole.

[0014] Figure 7 yes Figure 3 A three-dimensional view of the middle blocking part.

[0015] Figure 8 yes Figure 4 A three-dimensional cross-sectional view of the middle blocking portion, the abutting portion and the shell portion.

[0016] Fig. 9 yes Figure 7 sectional view of .

[0017] Fig.10 yes Figure 3 A three-dimensional cross-sectional view of the middle shell part, used to show the focusing cup, light source and detection probe. DETAILED DESCRIPTION

[0018] The exemplary embodiments of the present application are described in detail below in conjunction with the accompanying drawings. In the absence of conflict, the features of the following embodiments and implementations can be combined with each other.

[0019] As environmentally friendly refrigerants replace traditional refrigerants, the industry has found that some environmentally friendly refrigerants are flammable compared to traditional refrigerants, which poses a safety hazard to air-conditioning systems. Therefore, it is necessary to use a gas concentration detection device to detect whether the refrigerant is leaking, so that the air-conditioning control system can shut down and alarm in time to reduce the safety hazards caused by environmentally friendly refrigerants.

[0020] like Figures 1 to 10 The figure shows a gas detection device in accordance with the present application, which includes: a shell 1, a shell part 3, a first circuit board 8 and an electronic component 83; the shell 1 has a plurality of first connecting holes 13 and an inner cavity 15, the first connecting holes 13 are arranged through the shell 1, the electronic component 83 is connected to the first circuit board 8, the shell part 3 is connected to the first circuit board 8, and the electronic component 83, the first circuit board 8 and the shell part 3 are all located in the inner cavity 15.

[0021] Reference Figure 1 as well as Figure 2 , define the direction parallel to the length direction of the shell 1 as the longitudinal direction X, the direction parallel to the width direction of the shell 1 as the transverse direction Y, and the direction parallel to the height direction of the gas detection device as the vertical direction Z.

[0022] In some embodiments, reference Figure 1 as well as Figure 2 The housing 1 includes an upper shell 11 and a lower shell 12, and the upper shell 11 and the lower shell 12 are connected. Specifically, the upper shell 11 can be bonded, bolted, or snap-fitted to the lower shell 12 by one or more of the following methods.

[0023] Reference Figure 1 as well as Figure 2 The upper shell 11 and the lower shell 12 are distributed along the vertical direction Z. The upper shell 11 and the lower shell 12 are both located outside the inner cavity 15. The upper shell 11 has a plurality of first communication holes 13. The first communication holes 13 are arranged through the upper shell 11 and communicate with the outside of the gas detection device. The gas detection device includes a blocking portion 2, a resisting portion 6, and a waterproof breathable membrane 7; the waterproof breathable membrane 7 is located between the first communication holes 13 and the resisting portion 6, and the resisting portion 6 is sealed and connected to the upper shell 11. Specifically, the resisting portion 6 is ultrasonically welded, bonded, or snap-fitted to the upper shell 11.

[0024] In some embodiments, reference Figure 5 as well as Figure 6 The outer shell 1 has a second groove body 16, the first connecting hole 13 and the second groove body 16 are arranged in a corresponding position, and the second groove body 16 is recessed from the wall of the inner cavity 15 to the outside of the outer shell 1. Specifically, the upper shell 11 has a second groove body 16, and the second groove body 16 is recessed from the wall of the inner cavity 15 to the outside of the outer shell 1.

[0025] Reference Figure 4as well as Figure 5 The conflicting portion 6 and the waterproof breathable membrane 7 are both located in the inner cavity 15, the conflicting portion 6 has a plurality of third communicating holes 61, the third communicating holes 61 are arranged in alignment with the first communicating holes 13, and the waterproof breathable membrane 7 completely covers the plurality of third communicating holes 61 and the plurality of first communicating holes 13; specifically, the plurality of third communicating holes 61 correspond to the plurality of first communicating holes 13 one by one, the plurality of first communicating holes 13 are gaseously connected with the plurality of third communicating holes 61, and the orthographic projections of the first communicating holes 13 and the third communicating holes 61 on the waterproof breathable membrane 7 are both located inside the waterproof breathable membrane 7.

[0026] In some embodiments, reference Figure 4 as well as Figure 5 The interference portion 6 includes an embedded portion 63 and a supporting portion 64, the embedded portion 63 and the supporting portion 64 are distributed along the vertical direction Z, the embedded portion 63 and the supporting portion 64 are an integrated piece, the supporting portion 64 is located between the waterproof breathable membrane 7 and the embedded portion 63, the supporting portion 64 is at least partially located in the second groove body 16, and the supporting portion 64 is sealed and connected to the upper shell body 11. Specifically, the supporting portion 64 is sealed and connected to the upper shell body 11 by ultrasonic welding or bonding.

[0027] When welding the abutment part 6 to the upper shell 11, the operator first places the support part 64 of the abutment part 6 in the second groove 16 so that the abutment part 6 is not easy to move during welding, and then welds the abutment part 6 to the upper shell 11 by ultrasonic welding to facilitate the welding operation.

[0028] Reference Figure 3 as well as Figure 4 The blocking part 2 is located in the inner cavity 15, and the blocking part 2 is connected to the outer shell 1. Specifically, the blocking part 2 is connected to the upper outer shell 1, and the first connecting hole 13, the waterproof breathable membrane 7, the resistance part 6 and the blocking part 2 are sequentially distributed downward along the vertical direction Z.

[0029] Reference Figure 4 , Figure 5 as well as Figure 7 The housing 1 has a first slot 14. Specifically, the upper housing 11 has a first slot 14, and the first slot 14 is located at the periphery of the blocking portion 2. The blocking portion 2 has a second clamping block 5, and the second clamping block 5 includes a second clamping portion 51 and a second deformation portion 52. The second deformation portion 52 is connected to the blocking portion 2, and the second deformation portion 52 extends from the blocking portion 2 in a vertical downward direction. The second clamping portion 51 is connected to the second deformation portion 52, and the second clamping portion 51 extends from the second deformation portion 52 to the first slot 14.

[0030] Reference Figure 4 , Figure 5 as well as Figure 7Specifically, the second deformation portion 52 and the blocking portion 2 are an integral part, the second clamping portion 51 and the second deformation portion 52 are an integral part, the second deformation portion 52, the blocking portion 2 and the second clamping portion 51 are all plastic parts, the second clamping portion 51 is at least partially located in the first groove body 14, the second clamping portion 51 has a second guide surface 53, the inclination direction of the second guide surface 53 is inclined relative to the vertical direction Z, and the highest point of the second guide surface 53 is closer to the second deformation portion 52 than the lowest point of the second guide surface 53.

[0031] When the blocking part 2 is installed in the upper shell 11, the second guide surface 53 contacts the upper shell 1 to deform the second deformation part 52. When the second clamping part 51 is aligned with the first groove body 14, the second deformation part 52 is reset so that the second clamping part 51 is at least partially located in the first groove body 14, thereby realizing that the blocking part 2 and the upper shell 11 are interlocked and connected together.

[0032] Reference Figure 7 , Figure 8 as well as Fig. 9 The blocking portion 2 has a diffusion cavity 21, an air inlet 22 and a bottom port 23, which are distributed downward in sequence along the vertical direction Z. The diffusion cavity 21 penetrates the blocking portion 2 through the air inlet 22. The air inlet 22, the diffusion cavity 21 and the bottom port 23 are arranged in a corresponding position. The air inlet 22 is closer to the third connecting hole 61 than the bottom port 23. The third connecting hole 61 is connected to the diffusion cavity 21 through the air inlet 22, and the flow area of ​​the air inlet 22 is greater than the flow area of ​​the bottom port 23.

[0033] Specifically, refer to Figure 7 , Figure 8 as well as Fig. 9 The blocking portion 2 has a first inclined surface 24 , the inclination direction of the first inclined surface 24 is inclined relative to the vertical direction Z, the first inclined surface 24 is located at the periphery of the diffusion cavity 21 , and the first inclined surface 24 is located between the air inlet 22 and the bottom port 23 .

[0034] In some embodiments, reference Figure 7 , Figure 8 as well as Fig. 9The blocking portion 2 has a second inclined surface 241, a third inclined surface 242 and a fourth inclined surface 243, which are all located at the periphery of the diffusion cavity 21, and the inclination directions of the second inclined surface 241, the third inclined surface 242 and the fourth inclined surface 243 are all inclined relative to the vertical direction Z. The first inclined surface 24, the second inclined surface 241, the third inclined surface 242 and the fourth inclined surface 243 are arranged to form the diffusion cavity 21; the flow area of ​​the diffusion cavity 21 gradually decreases in the downward direction along the vertical direction Z, and the embedded portion 63 is at least partially located at the air inlet 22; in some embodiments, the first inclined surface 24, the second inclined surface 241, the third inclined surface 242 and the fourth inclined surface 243 can be a plane, a concave surface, a convex surface, a wavy surface, a serrated surface, or a step surface.

[0035] The housing 3 has a detection cavity 32 and a second communication hole 31 . The second communication hole 31 is connected to the detection cavity 32 , and the second communication hole 31 is connected to the bottom opening 23 .

[0036] On the one hand, the flow area of ​​the air inlet 22 is greater than the flow area of ​​the bottom port 23, and the air inlet 22 can flow as much detected gas as possible into the diffusion cavity 21; on the other hand, the detected gas entering through the air inlet 22 is guided by the first inclined surface 24, the second inclined surface 241, the third inclined surface 242 and the fourth inclined surface 243, so that as much detected gas as possible enters the detection cavity 32 of the shell part 3 for detection, thereby accelerating the response speed of the gas detection device.

[0037] In some embodiments, reference Figure 8 as well as Fig. 9 The blocking portion 2 has a recessed groove 25, which is recessed from the side of the blocking portion 2 away from the first connecting hole 13 toward the diffusion cavity 21, and the recessed groove 25 is connected to the bottom opening 23. The blocking portion 2 has a first clamping block 4 and a blocking wall 26, and the blocking wall 26 and the first clamping block 4 are respectively located on both sides of the recessed groove 25 distributed along the vertical direction Z, and the shell portion 3 is at least partially located in the recessed groove 25. Specifically, the first clamping block 4 includes a first clamping portion 41 and a first deformation portion 42, and the first deformation portion 42 is located on the side of the blocking portion 2 away from the third connecting hole 61, the first deformation portion 42 is connected to the blocking portion 2, and the first clamping portion 41 is connected to the first deformation portion 42, and the first clamping portion 41 extends from the first deformation portion 42 to the recessed groove 25. The first clamping portion 41 has a first guide surface 43, and the first guide surface 43 is inclined relative to the vertical direction Z. The highest point of the first guide surface 43 is closer to the recessed groove 25 than the lowest point of the first guide surface 43.

[0038] Specifically, the first deformation portion 42, the first clamping portion 41 and the blocking portion 2 are all integral parts and are all plastic parts. In some embodiments, the first clamping portion 41 and the first deformation portion 42 are both long strips, and the first clamping portion 41 and the first deformation portion 42 extend along the longitudinal direction X, and the first deformation portion 42 is connected to the blocking wall 26.

[0039] Reference Figure 8 as well as Fig. 9 The blocking wall 26 and the first clamping portion 41 are sequentially distributed downward along the vertical direction Z, and the blocking wall 26 and the first clamping portion 41 are respectively located at the upper and lower sides of the recessed groove 25, the blocking wall 26 at least partially contacts the housing 1, and the first clamping portion 41 at least partially contacts the housing 1. Specifically, the blocking wall 26 is arc-shaped, the housing 3 is cylindrical, and the first clamping portion 41 is located, and the blocking wall 26 and the first clamping portion 41 form a space for limiting the housing 3.

[0040] When the shell part 3 is installed on the blocking part 2, the shell part 3 contacts the first guide surface 43 on the first clamping part 41. The first guide surface 43 enables the first deformation part 42 to be more easily deformed, so that the first clamping part 41 moves in the direction away from the recessed groove 25. When the shell part 3 contacts the blocking wall 26, the first clamping part 41 returns to its original position under the restoring action of the first deformation part 42, so that at least part of the first clamping part 41 is located on the side of the shell part 3 away from the first connecting hole 13. The first clamping part 41 and the blocking wall 26 limit the shell part 3.

[0041] In some embodiments, reference Figure 8 as well as Fig. 9 , the shell part 3 is at least partially located in the recessed groove 25, the side of the abutment part 6 facing the diffusion cavity 21 is recessed to form a limiting groove 62, the limiting groove 62 cooperates with the shell part 3, the shell part 3 is at least partially located in the limiting groove 62, at least part of the side wall of the shell part 3 contacts the groove wall of the limiting groove 62, the second connecting hole 31 is at least partially located in the limiting groove 62, and the limiting groove 62 is at least partially connected to the third connecting hole 61. Specifically, there are three second connecting holes 31, and the three second connecting holes 31 are evenly distributed along the circumferential direction of the axis of the shell part 3, one of the second connecting holes 31 is at least partially connected to the limiting groove 62, and the other two second connecting holes 31 are both connected to the diffusion cavity 21, and further, the other two second connecting holes 31 are at least partially located at the bottom opening 23, and the second connecting holes 31 are connected to the bottom opening 23.

[0042] The limiting groove 62 can improve the installation strength of the shell part 3 on the blocking part 2 and reduce the movement of the shell part 3; since the second connecting hole 31 is at least partially located in the limiting groove 62, part of the detected gas can pass through the first connecting hole 13, the waterproof breathable membrane 7, the third connecting hole 61, the limiting groove 62 and the second connecting hole 31 in sequence to directly enter the detection cavity 32 for detection, and another part of the detected gas is guided by the first inclined surface 24, the second inclined surface 241, the third inclined surface 242 and the fourth inclined surface 243 and enters the detection cavity 32 through other second connecting holes 31 for detection. The gathering effect of the first inclined surface 24, the second inclined surface 241, the third inclined surface 242 and the fourth inclined surface 243 accelerates the gas flow rate entering the diffusion cavity 21, further accelerating the response time.

[0043] In some embodiments, reference Figure 3 as well as Fig.10 The length direction of the shell 3 is parallel to the longitudinal direction X, the detection cavity 32 penetrates the shell 3 along the longitudinal direction X, the gas detection device includes a detection component 9, the detection component 9 includes a light source 33, a focusing cup 34, a detection probe 35, a second circuit board 81 and a third circuit board 82, the second circuit board 81 and the third circuit board 82 are distributed along the longitudinal direction X, and the second circuit board 81 and the third circuit board 82 are located on both sides of the shell 3, and the second circuit board 81 and the third circuit board 82 are both sealed and connected to the shell 3.

[0044] Reference Figure 3 as well as Fig.10 , the detection probe 35 is at least partially located in the detection cavity 32, the detection probe 35 is electrically connected to the second circuit board 81, and the second circuit board 81 is physically and electrically connected to the first circuit board 8. At least part of the light source 33 and at least part of the focusing cup 34 are both located in the detection cavity 32, the light source 33 is located in the focusing cup 34, the focusing cup 34 is sealed and connected to the housing portion 3, the light source 33 is electrically connected to the third circuit board 82, and the third circuit board 82 is electrically connected to the first circuit board 8.

[0045] The above implementation modes are only used to illustrate the present application and are not intended to limit the technical solutions described in the present application. The understanding of the present application should be based on the technical personnel in the relevant technical field. Although the present application has been described in detail in this specification with reference to the above implementation modes, ordinary technical personnel in the field should understand that the technical personnel in the relevant technical field can still modify or make equivalent substitutions to the present application, and all technical solutions and improvements thereof that do not depart from the spirit and scope of the present application should be included in the scope of the claims of the present application.

Claims

1. A gas detection device, characterized in that: The invention comprises a shell, a detection component, a blocking part and a shell part, wherein the blocking part and the shell part are both located in the shell; the shell has a first communication hole, the blocking part has a diffusion cavity, the first communication hole is connected to the external gas of the gas detection device, and the first communication hole is connected to the gas of the diffusion cavity; the shell part has a second communication hole and a detection cavity, the detection component is at least partially located in the detection cavity, and the second communication hole is connected to the detection cavity; The diffusion cavity has an air inlet and a bottom port; along the height direction of the gas detection device, the air inlet is closer to the first connecting hole than the bottom port, the flow area of ​​the air inlet is larger than the flow area of ​​the bottom port, and the second connecting hole is at least partially located at the bottom port.

2. The gas detection device according to claim 1, characterized in that: The blocking portion has a first inclined surface, the inclination direction of the first inclined surface is inclined relative to the height direction of the gas detection device, the first inclined surface is located at the periphery of the diffusion cavity, and the first inclined surface is located between the air inlet and the bottom port.

3. The gas detection device according to claim 2, characterized in that: The blocking portion has a second inclined surface, a third inclined surface and a fourth inclined surface, the second inclined surface, the third inclined surface and the fourth inclined surface are all located at the periphery of the diffusion cavity, the inclination directions of the second inclined surface, the third inclined surface and the fourth inclined surface are all inclined relative to the height direction of the gas detection device, and the second inclined surface, the third inclined surface and the fourth inclined surface are all located between the air inlet and the bottom port.

4. The gas detection device according to claim 1, characterized in that: The shell part is limitedly connected or fixedly connected to the blocking part, the blocking part has a recessed groove, the recessed groove is communicated with the bottom opening, the blocking part is provided with a first clamping block, and the blocking part has a blocking wall; along the height direction of the gas detection device, the blocking wall and the first clamping block are at least partially located on both sides of the recessed groove, the shell part is at least partially located in the recessed groove, and the first clamping block is at least partially in contact with the shell part.

5. The gas detection device according to claim 4, characterized in that: The first clamping block includes a first clamping portion and a first deformation portion, the first deformation portion is connected to the blocking portion, and the first clamping portion is connected to the first deformation portion; along the height direction of the gas detection device, at least part of the first clamping portion and the blocking wall are respectively located on both sides of the recessed groove.

6. The gas detection device according to claim 1, characterized in that: The blocking portion is connected to the shell, the shell has a first groove body, and the blocking portion has a second clamping block; the second clamping block includes a second clamping portion and a second deformation portion, the second deformation portion is connected to the blocking portion, the second clamping portion is connected to the second deformation portion, the second clamping portion and the second deformation portion are both located in the shell, and the second clamping portion is at least partially located in the first groove body.

7. The gas detection device according to claim 1, characterized in that: The gas detection device includes a resistance part and a waterproof breathable membrane, the resistance part has a third connecting hole, the resistance part is at least partially located between the air inlet and the first connecting hole, the resistance part and the shell clamp the waterproof breathable membrane, the third connecting hole is connected to the first connecting hole, the waterproof breathable membrane covers the third connecting hole and the first connecting hole, and the resistance part is connected to the shell.

8. The gas detection device according to claim 7, characterized in that: The shell part is cylindrical, the abutting part has a limiting groove, the second communicating hole is at least partially located in the limiting groove, and the shell part is at least partially located in the limiting groove.

9. The gas detection device according to claim 7, characterized in that: The shell has an inner cavity, and the shell has a second groove body. The second groove body is recessed from the wall of the inner cavity to the outside of the shell, and the abutment portion is at least partially located in the second groove body.

10. The gas detection device according to claim 7, characterized in that: The abutting portion includes an embedding portion and a supporting portion, wherein the supporting portion and the embedding portion are an integral piece, the supporting portion is located between the waterproof breathable membrane and the embedding portion, the embedding portion is at least partially located at the air inlet, and the supporting portion is welded to the shell.

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