Gas detection device

Abstract

A gas detection device includes a housing and a detection unit, the housing has a first side wall, the first side wall has a ventilation part, the ventilation part has a through hole, the through hole penetrates through the first side wall, the through hole is communicated with the outside of the gas detection device; the housing has an inner cavity, the housing has a blocking part, the blocking part is connected with the first side wall, the blocking part divides the inner cavity into a first cavity and a second cavity, the ventilation part is located at the periphery of the first cavity; the detection unit has a gas chamber, the detection unit has a second side wall, the second side wall is located at the periphery of the gas chamber, the second side wall has a hole part, the hole part has a matching hole, the matching hole penetrates through the second side wall, the hole part is located in the first cavity, the matching hole is communicated with the gas chamber, and the matching hole is communicated with the through hole. The application is beneficial to improve the gas detection time response of the gas detection device.

Description

Technical Field

[0001] This application relates to the field of measurement technology, and in particular to a gas detection device. Background Technology

[0002] A gas detection device based on the optical detection principle includes a housing and a detection unit. The housing has an inner cavity to house the detection unit, thus protecting it. During detection, gas enters the gas chamber of the detection unit, and when the gas concentration reaches a certain value, the detection unit can detect the gas. In related technologies, because the inner cavity of the housing has a large volume, the gas concentration is diluted after entering the inner cavity, affecting the time response of the gas detection device to the gas.

[0003] Therefore, gas detection devices need to be improved to enhance time response. Summary of the Invention

[0004] The purpose of this application is to provide a gas detection device that improves the time response of the gas detection device.

[0005] The objective of this application is achieved through the following technical solution:

[0006] A gas detection device includes a housing and a detection unit. The housing has a first sidewall, the first sidewall has a vent, the vent has a through hole, the through hole penetrates the first sidewall, and the through hole communicates with the outside of the gas detection device.

[0007] The outer shell has an inner cavity and a baffle. The baffle is connected to the first sidewall and divides the inner cavity into a first cavity and a second cavity. The vent is located on the periphery of the first cavity.

[0008] The detection unit has an air chamber and a second sidewall located around the air chamber. The second sidewall has a hole with a mating hole that penetrates the second sidewall. The hole is located in the first cavity and communicates with the air chamber and the through hole.

[0009] In this application, the baffle divides the inner cavity of the outer casing into a first cavity and a second cavity. The outer casing has a first sidewall with a vent located around the first cavity. The detection unit has a second sidewall with a hole penetrating through it and communicating with the gas chamber. The hole is located in the first cavity, and the hole communicates with the through hole. Thus, the baffle reduces gas diffusion into the second cavity, confining the space for gas diffusion to the first cavity, thereby improving the gas detection time response of the gas detection device. Attached Figure Description

[0010] Figure 1 This is a three-dimensional schematic diagram of the gas detection device of this application;

[0011] Figure 2 for Figure 1 An exploded view of the gas detection device shown.

[0012] Figure 3 for Figure 1 Another exploded view of the gas detection device shown.

[0013] Figure 4 for Figure 1 A three-dimensional cross-sectional schematic diagram of the gas detection device shown.

[0014] Figure 5 for Figure 1 A three-dimensional cross-sectional view of the gas detection device shown from another angle;

[0015] Figure 6 for Figure 1 The diagram shown is a three-dimensional representation of a ring-shaped structure.

[0016] Figure 7 for Figure 6 The diagram shows the relationship between the first axis and the first diagonal.

[0017] Figure 8 for Figure 1 A three-dimensional schematic diagram of some structural components of the gas detection device shown.

[0018] Figure 9 for Figure 8 An exploded view of some structural components of the gas detection device shown.

[0019] Figure 10 for Figure 8 An exploded view of another structural component of the gas detection device shown.

[0020] Figure 11 for Figure 1 Another perspective three-dimensional cross-sectional view of the gas detection device shown;

[0021] Figure 12 for Figure 8 The diagram shows the relationship between the second axis and the second diagonal.

[0022] Figure 13 The image shows a bottom view of the gas detection device of this application, where the baffle is a flat baffle.

[0023] Figure 14 The image shows a bottom view of the gas detection device of this application, where the baffle is an arc-shaped baffle.

[0024] Figure 15The image shows a bottom view of the gas detection device of this application, where the baffle is a bent baffle.

[0025] Figure 16 The image shows a bottom view of the gas detection device of this application, which has two flat baffles as its baffles.

[0026] Figure 17 This is a bottom view of the gas detection device of this application, which has two arc-shaped baffles as its baffles.

[0027] Figure 18 The image shows a bottom view of the gas detection device of this application, which has two bent baffles as its baffle section.

[0028] Figure 19 This is a bottom view of the gas detection device of this application, where the baffle is a semi-ring structure. Detailed Implementation

[0029] The exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. If several embodiments exist, features in these embodiments may be combined with each other without conflict. When the description refers to the drawings, unless otherwise stated, the same numbers in different drawings represent the same or similar elements. The descriptions in the following exemplary embodiments do not represent all embodiments consistent with the present invention; rather, they are merely examples of apparatuses, products, and / or methods consistent with some aspects of the present invention as set forth in the claims.

[0030] The terminology used in this invention is for the purpose of describing particular embodiments only and is not intended to limit the scope of protection of this invention. The singular forms “a,” “the,” or “the” as used in the specification and claims of this invention are also intended to include the plural forms unless the context clearly indicates otherwise.

[0031] It should be understood that the terms "first," "second," and similar words used in the specification and claims of this invention do not indicate any order, quantity, or importance, but are merely used to distinguish features. Similarly, the terms "an" or "a" do not indicate a quantity limitation, but rather indicate the presence of at least one. Unless otherwise stated, the terms "before," "after," "upper," "lower," and similar words appearing in this invention are for ease of explanation only and are not limited to a specific location or spatial orientation. The terms "comprising" or "including" are an open-ended expression, meaning that the element preceding "comprising" or "including" encompasses the element following "comprising" or "including" and its equivalents, but this does not preclude the element preceding "comprising" or "including" from also including other elements. In this invention, the term "several" means two or more.

[0032] Please refer to Figures 1 to 19 As shown, this invention discloses a gas detection device, which includes a housing 10 and a circuit board assembly 20. The housing 10 has an inner cavity 100, so that at least a portion of the circuit board assembly 20 can be accommodated within the inner cavity 100. In some embodiments, the gas detection device can be used to detect the concentration of gaseous refrigerant, so that in the event of refrigerant leakage in an air conditioning system, timely detection and feedback can be sent to the air conditioning control system, thereby reducing the safety hazards caused by refrigerant leakage. Of course, in other embodiments, the gas detection device can also be applied in other environments to detect other gases, such as methane, ethane, carbon dioxide, etc. The gas detection device can also be used to detect the concentration of gases released by a battery during thermal runaway. This application does not impose excessive limitations on this.

[0033] See Figure 2 The circuit board assembly 20 includes a detection unit 21 and a circuit board 22. At least a portion of the detection unit 21 and at least a portion of the circuit board 22 are located within the housing 10. The housing 10 has a first sidewall 10' with a vent 30 and a through hole 301 penetrating the first sidewall 10'. The through hole 301 communicates with the outside of the gas detection device, allowing gas to enter the inner cavity 100 through the through hole 301.

[0034] The detection unit 21 is connected to the circuit board 22; the detection unit 21 is used to detect the concentration of the gaseous refrigerant. The detection unit 21 shown in the embodiments of this application is an optical detection unit 21. Specifically, the detection unit 21 can employ the infrared light detection principle. In other embodiments, the detection unit 21, depending on its working principle, can also be a semiconductor type, a thermal conductivity type, an electrochemical type, a catalytic combustion type, an ultrasonic type, etc.

[0035] See Figure 2 and Figure 3The circuit board 22 also includes a processing chip 23 and several electronic components 24. The circuit board 22 includes a third surface 221 and a fourth surface 222 located on opposite sides of its thickness direction. The circuit board 22 has several conductive paths, at least a portion of which is electrically connected to the processing chip 23, and at least a portion of which is electrically connected to the electronic components 24. In the embodiment illustrated in this application, the detection unit 21 is mounted on the third surface 221 of the circuit board 22, and the processing chip 23 and several electronic components 24 are all mounted on the fourth surface 222 of the circuit board 22. Of course, in other embodiments, the detection unit 21, the processing chip 23, and several electronic components 24 can all be mounted on the same side surface of the circuit board 22. The processing chip 23 is used to process the signal of the gaseous refrigerant concentration detected by the detection unit 21 and transmit it to an external control board or process it itself. The several electronic components 24 include filtering elements such as capacitors, resistors, and inductors, thereby realizing the amplification and filtering of the signal from the detection unit 21.

[0036] The outer casing 10 includes a first casing 11 and a second casing 12. The first casing 11 and the second casing 12 are fixedly connected, or the first casing 11 and the second casing 12 are mutually limitingly connected, or the outer casing 10 is a single piece. In the embodiment illustrated in this application, the first casing 11 and the second casing 12 are fixedly connected by a snap-fit ​​connection. The first casing 11 is located at the upper end of the second casing 12, that is, the first casing 11 and the second casing 12 can be assembled together along the vertical direction.

[0037] See Figure 1 and Figure 3 The first housing 11 includes a first sidewall 10' and a first inner cavity 110'. The first sidewall 10' includes a first wall portion 111 and a first peripheral wall 112 extending vertically from the first wall portion 111. The second housing 12 has a second inner cavity 120' for accommodating the circuit board 22. The inner cavity 100 includes the first inner cavity 110' and the second inner cavity 120'.

[0038] The second housing 12 includes a second wall portion 121 and a second peripheral wall 122 extending perpendicularly from the second wall portion 121. The first wall portion 111 and the second wall portion 121 are located on different sides of the circuit board 22 in the thickness direction. The first wall portion 111 is located on the side where the third surface 221 of the circuit board 22 is located, and the second wall portion 121 is located on the side where the fourth surface 222 of the circuit board 22 is located. The first peripheral wall 112 and the second peripheral wall 122 can together form the third wall portion of the housing 10, so that the third wall portion is connected between the first wall portion 111 and the second wall portion 121 along the first direction HH. The first peripheral wall 112 and the second peripheral wall 122 can be fixed by a snap-fit ​​connection. The snap-fit ​​connection eliminates the need for screws, has a simple structure, is easy to assemble, and facilitates disassembly of the housing during maintenance. The first direction HH is the height direction of the gas detection device.

[0039] Specifically, such as Figure 2 As shown, the first housing 11 includes a first snap-fit ​​portion 113, and the second housing 12 includes a second snap-fit ​​portion 123. When the first housing 11 and the second housing 12 are assembled, the first snap-fit ​​portion 113 and the second snap-fit ​​portion 123 engage with each other, thereby fixing the first housing 11 and the second housing 12 together. In the illustrated embodiment, the first snap-fit ​​portion 113 extends downward from the first peripheral wall 112, and the first snap-fit ​​portion 113 has a snap-fit ​​groove 114. The second snap-fit ​​portion 123 is a snap-fit ​​boss protruding from the second peripheral wall 122, and the second snap-fit ​​portion 123 protrudes towards the inner cavity 100. In this way, the second snap-fit ​​portion 123 can be engaged in the snap-fit ​​groove 114 to achieve fixation. The second snap-fit ​​portion 123 is generally a triangular boss with a larger thickness at the lower end and a smaller thickness at the upper end, which facilitates the first snap-fit ​​portion 113 to slide downward along the slope of the second snap-fit ​​portion 123 and finally engage together. Of course, in some other embodiments, the positions of the first latching part 113 and the second latching part 123 can be interchanged. For example, a structure similar to the second latching part 123 can be provided on the first housing 11, and a structure similar to the first latching part 113 can be provided on the second housing 12. As long as the latching cooperation between the two housings can be achieved, this application is not limited to the illustrated embodiment.

[0040] In the embodiments of this application, both the first housing 11 and the second housing 12 are plastic parts. The cross-sections of both the first housing 11 and the second housing 12 have rounded rectangular outlines to facilitate fitting together. Correspondingly, the circuit board 22 is also a regular rectangular plate that fits the shape of the second housing 12. Specifically, see... Figure 2 and Figure 3The first peripheral wall 112 includes a first sub-wall 1121, a second sub-wall 1122, a third sub-wall 1123, and a fourth sub-wall 1124. The first sub-wall 1121 and the third sub-wall 1123 are parallel, and the second sub-wall 1122 and the fourth sub-wall 1124 are parallel. The first peripheral wall 112 also includes a first corner wall 1125 connecting the first sub-wall 1121 and the second sub-wall 1122, a second corner wall 1126 connecting the second sub-wall 1122 and the third sub-wall 1123, a third corner wall 1127 connecting the third sub-wall 1123 and the fourth sub-wall 1124, and a fourth corner wall 1128 connecting the fourth sub-wall 1124 and the first sub-wall 1121. The second peripheral wall 122 includes a fifth sub-wall 1221, a sixth sub-wall 1222, a seventh sub-wall 1223, and an eighth sub-wall 1224. The fifth sub-wall 1221 and the seventh sub-wall 1223 are parallel, and the sixth sub-wall 1222 and the eighth sub-wall 1224 are parallel. The second peripheral wall 122 also includes a fifth corner wall 1225 connecting the fifth sub-wall 1221 and the sixth sub-wall 1222, a sixth corner wall 1226 connecting the sixth sub-wall 1222 and the seventh sub-wall 1223, a seventh corner wall 1227 connecting the seventh sub-wall 1223 and the eighth sub-wall 1224, and an eighth corner wall 1228 connecting the eighth sub-wall 1224 and the fifth sub-wall 1221. In the length direction of the detection unit 21, the detection unit 21 is located between the fifth corner wall 1225 and the seventh corner wall 1227. Thus, the length of the detection unit 21 can be increased within a confined space, improving the detection accuracy of the gas detection device.

[0041] The outer casing 10 has a stop 101 connected to a first sidewall 10', extending from the first sidewall 10' into the inner cavity 100. The stop 101 divides the inner cavity 100 into a first cavity 1001 and a second cavity 1002. The stop 101 is located between the first cavity 1001 and the second cavity 1002. A vent 30 is located around the first cavity 1001, and a through hole 301 communicates with the first cavity 1001.

[0042] Specifically, the stop 101 is connected to the first wall 111, the first peripheral wall 112 is located on the periphery of the second cavity 1002, the stop 101 is located inside the first peripheral wall 112, and at least a portion of the second cavity 1002 is located between the stop 101 and the first peripheral wall 112. The stop 101 is at least partially located in the first inner cavity 110', which includes at least a portion of the first cavity 1001 and at least a portion of the second cavity 1002. The first latching part 113 and the second latching part 123 are located in the second cavity 1002.

[0043] The first sidewall 10' and the baffle 101 can be a single piece, or they can be fixedly connected or limited in place. For example, the first sidewall 10' can be provided with a mounting groove, and the baffle 101 can be installed in the mounting groove, with the baffle 101 detachably connected to the first sidewall 10'. The baffle 101 can at least prevent some of the gas from rapidly diffusing into the second chamber 1002, allowing the gas in the first inner chamber 110' to quickly reach the test concentration, thus improving the time response of the detection unit to the gas under test.

[0044] The baffle 101 divides the first inner cavity 110' into a first sub-inner cavity and a second sub-inner cavity. The first sub-inner cavity 110' includes at least a portion of the first cavity 1001, and the second sub-inner cavity includes at least a portion of the second cavity 1002.

[0045] In the embodiment illustrated in this application, along the height direction of the gas detection device, the circuit board 22 is away from the first wall portion 111 relative to the baffle 101, and there is a gap 200 between the baffle 101 and the circuit board 22.

[0046] The baffle 101 includes a third sidewall 101', which is parallel to the height direction of the gas detection device; along the height direction of the gas detection device, the baffle 101 is located at the periphery of the ventilation section 30 in the first projection S1 of the first housing 11.

[0047] Figures 3 to 12 One embodiment of this application is shown; see [link to embodiment]. Figure 3 The baffle 101 has an annular structure, with the first chamber 1001 located inside the baffle 101 and the second chamber 1002 located outside the baffle 101. The gas to be tested enters the first chamber 1001 through the through hole 301, and can quickly reach the test concentration in the first chamber 1001, improving the time response of the detection unit 21 to the gas to be tested. The baffle 101 can at least prevent a portion of the gas to be tested from rapidly diffusing into the second chamber 1002.

[0048] In the embodiment illustrated in this application, the first sidewall 10' and the baffle 101 are an integral structure with fewer parts, which facilitates assembly and also improves the testing stability of the gas detection device.

[0049] See Figure 4 and Figure 6 The first wall portion 111 includes a first surface 1111 and a second surface 1112 located on opposite sides of its thickness direction. The first surface 1111 is disposed opposite to the detection unit 21, and a stop portion 101 is disposed on the first surface 1111 of the first wall portion 111. Specifically, the stop portion 101 extends from the first surface 1111 of the first wall portion 111 along a first direction HH. Alternatively, a mounting groove is provided on the first surface 1111 of the first wall portion 111, and at least a portion of the stop portion 101 is fixed in the mounting groove.

[0050] See Figure 7 In the embodiment illustrated in this application, along the first direction HH, the stop 101 has a first axis X1 in the first projection S1 of the first sidewall 10', and the first housing 11 has a first diagonal X1', with the first axis X1 coinciding with the first diagonal X1'.

[0051] See Figure 7 The baffle 101 includes a first plate portion 1011, a second plate portion 1012, a third plate portion 1013, and a fourth plate portion 1014. The first plate portion 1011 and the third plate portion 1013 are arranged parallel to each other, and the second plate portion 1012 and the fourth plate portion 1014 are arranged parallel to each other. Furthermore, the first plate portion 1011, the second plate portion 1012, the third plate portion 1013, and the fourth plate portion 1014 are all perpendicular to the first wall portion 111.

[0052] The ventilation section 30 has several through holes 301, which are arranged in multiple rows. Each row has multiple through holes 301, and the multiple through holes 301 are arranged at intervals. The through holes 301 in adjacent rows are staggered. This arrangement of multiple through holes 301 is beneficial to improving air intake efficiency.

[0053] The circuit board 22 is fixed to the second housing 12, and the second peripheral wall 122 surrounds the circuit board 22 circumferentially. The detection unit 21 is at least partially located between the circuit board 22 and the first wall 111. The circuit board 22 is rectangular, and the thickness directions of the circuit board 22, the first wall 111, and the second wall 121 are approximately co-directional. In the case where the first housing 11 and the second housing 12 are assembled, as follows... Figure 5 As shown, there is a gap of 200 between the outer end face of the stop 101 and the third surface 221 of the circuit board 22. That is to say, the stop 101 does not contact the circuit board 22, so as to avoid affecting the circuit board 22.

[0054] See Figure 9The circuit board 22 has two diagonally arranged first corner holes 231 and two second corner holes 232. The second housing 12 also includes two positioning posts 120 and two support posts 130 extending vertically from the second wall portion 121. The positioning posts 120 mate with the first corner holes 231, with at least a portion of the positioning posts 120 located within the first corner holes 231. The positioning posts 120 may have a cross-shaped cross-section, with their outer diameter at the top away from the second wall portion 121 being smaller than their outer diameter near the bottom of the second wall portion 121, thereby facilitating insertion into the first corner holes 231 of the circuit board 22. The support posts 130 mate with the second corner holes 232, and the support posts 130 have threaded holes 131 extending along the thickness direction of the circuit board 22, the threaded holes 131 being coaxial with the second corner holes 232. The gas detection device also includes screws 140, which pass through the second corner holes 232 and are screwed into the threaded holes 131, thereby securely mounting the circuit board 22 in the corresponding cavities of the second housing 12. The positioning post 120 and the support post 130 work together to improve the assembly efficiency of the gas detection device. The support post 130 has a certain height, which provides sufficient installation space for the electronic components 24 mounted on the fourth surface 222 of the circuit board 22.

[0055] See Figure 10 The detection unit 21 includes a detection housing 211, a light source module 212, and a detection probe 213. The detection housing 211 can be a long, thin cylindrical housing, and its cross-section can be rectangular, circular, or other shapes. In this embodiment, a detection housing 211 with a rounded rectangular cross-section is illustrated. In other embodiments, a non-reflective air chamber can be constructed within the detection housing 211, meaning that light emitted from the light source can reach the detection probe after several reflections. In the following embodiments of this application, a cylindrical air chamber is constructed within the detection housing 211 as an example for detailed explanation.

[0056] See Figure 10 A light source module 212 is located at one end of the detection housing 211 along its length to emit light, and a detection probe 213 is located at the other end of the detection housing 211 along its length to receive light. The light source module 212 can be an infrared light source, and correspondingly, the detection probe 213 is an infrared detection probe. The light source module 212 and the detection probe 213 are almost coaxially arranged. The detection housing 211 is cylindrical, and the infrared light emitted by the light source module 212 is incident on the detection probe 213 almost in a straight line. The light source module 212 and the detection probe 213 are electrically connected to the circuit board 22. (See also...) Figure 10 and Figure 11The detection unit 21 has a gas chamber 700, and the detection housing 211 is at least partially located around the gas chamber 700. The detection unit 21 has a second sidewall 21' located around the gas chamber 700. The second sidewall 21' has a hole 2110 with a mating hole 2111 extending through the second sidewall 21'. The hole 2110 is located in the first cavity 1001, and the mating hole 2111 communicates with the gas chamber 700, the through hole 301, and the external environment of the gas detection device. Additionally, the detection housing 211 includes the second sidewall 21'; along the height direction of the gas detection device, the circuit board 22 is located away from the first sidewall 111 relative to the detection housing 211.

[0057] Both the light source module 212 and the detection probe 213 are connected to the detection housing 211. The light source module 212 is at least partially located around the gas chamber 700, and the detection probe 213 is at least partially located within the gas chamber 700. The light source module 212 is at least partially located in the first cavity 1001, and the detection probe 213 is at least partially located in the first cavity 1001. The circuit board 22 is located away from the first wall 111 relative to the light source module 212 and the detection probe 213.

[0058] The hole 2110 is disposed opposite to the stop 101, and the hole 2110 and the stop 101 are in clearance fit. The mating hole 2111 is connected to the first cavity 1001, and the through hole 301 is connected to the first cavity 1001; or, the hole 2110 is disposed opposite to the vent 30, and the hole 2110 and the vent 30 are in tight fit or clearance fit.

[0059] In the implementation shown in this application, such as Figure 5 As shown, the second sidewall 21' has a hole 2110, which is disposed opposite to the stop 101. There is a gap between the mating hole 2111 and the stop 101. After passing through the through hole 301, the gas first enters the first chamber 1001, and then enters the gas chamber 700 through the mating hole 2111.

[0060] Of course, in other embodiments, the second sidewall 21' has two holes 2110, which are disposed opposite to each other on the detection housing 211. Both holes 2110 are disposed opposite to the baffle 101, which enables gas to form convection.

[0061] In some other embodiments, the orifice 2110 is disposed opposite to the vent 30, and the orifice 2110 and the vent 30 are tightly fitted together. After passing through the through hole 301, the gas directly enters the gas chamber 700 through the mating hole 2111.

[0062] In some other embodiments, the orifice 2110 is disposed opposite to the vent 30, and the orifice 2110 and the vent 30 are fitted with a clearance. After passing through the through hole 301, the gas first enters the first cavity 1001, and then enters the gas chamber 700 through the fitting hole 2111.

[0063] The principle of the detection unit 21 described above is explained as follows: Different gases have different absorption spectra due to differences in their molecular structure, concentration, and energy distribution. When detecting a target gas, the absorption of light of a characteristic wavelength by the target gas conforms to Beer-Lambert law. Taking the light source module 212 as an infrared light source as an example, when the light source module 212 emits an infrared beam that passes through the gas chamber 700 and reaches the detection probe 213, the target gas will absorb infrared light of a specific wavelength. That is, the target gas will enter the first cavity 1001 through the through hole 301 of the outer shell 10, and then enter the gas chamber 700 through the mating hole 2111 on the detection shell 211. The target gas entering the gas chamber 700 will absorb infrared light of a characteristic wavelength. Thus, the detection probe 213 can calculate information such as the concentration of the target gas by detecting changes in light intensity.

[0064] See Figure 12 The detection housing 211 has a second projection S2 on the second housing 12 along the first direction HH. The second projection S2 has a second axis X2, and the second housing 12 has a second diagonal X2'. The second axis X2 of the second projection S2 coincides with the second diagonal X2' of the second housing 12. The first diagonal X1' of the first housing 11 is parallel to the second diagonal X2'. In this way, the length of the detection housing 211 can be increased within the confined space. Correspondingly, it is also beneficial to extend the distance between the light source module 212 and the detection probe 213. Thus, with a longer optical path, the gas can absorb infrared light more fully, which is beneficial to improving the detection accuracy of the gas detection device.

[0065] See Figure 4 and Figure 5The outer surface of the detection housing 211 includes at least a fifth surface 2112, a sixth surface 2113, a seventh surface 2114, and an eighth surface 2115. The fifth surface 2112 and the seventh surface 2114 are arranged parallel to each other, and the sixth surface 2113 and the eighth surface 2115 are arranged parallel to each other. The vent 30 is arranged opposite to the fifth surface 2112 of the detection housing 211. The seventh surface 2114 is assembled with the fourth surface 222 of the circuit board 22. The first plate portion 1011 of the baffle portion 101 is arranged parallel to the sixth surface 2113 of the detection housing 211; the third plate portion 1013 of the baffle portion 101 is arranged parallel to the eighth surface 2115 of the detection housing 211. The first plate portion 1011 and the third plate portion 1013 extend along the length direction of the baffle portion 101. The fifth surface 2112, the sixth surface 2113, the seventh surface 2114, and the eighth surface 2115 all extend along the length direction of the detection housing 211. The length direction of the stop 101 is consistent with the length direction of the detection housing 211.

[0066] See Figure 4 A second gap 300 exists between the inner surface of the first plate portion 1011 and the sixth surface 2113 of the detection housing 211, and a third gap 400 exists between the inner surface of the third plate portion 1013 and the eighth surface 2115 of the detection housing 211. Along the second direction WW, the second gap 300 is equal to the third gap 400. The value of the spacing 200 along the first direction HH is less than the value of the second gap 300 along the second direction WW. The second gap 300 and the third gap 400 are used for collecting the gas to be measured. The spacing 200 is set to avoid contact between the outer end face of the baffle 101 and the circuit board 22; the spacing 200 is small, so that only a small amount of gas diffuses into the inner cavity 100.

[0067] The mating hole 2111 penetrates the sixth surface 2113 of the detection housing 211, and the mating hole 2111 also penetrates the eighth surface 2115 of the detection housing 2111. The mating hole 2111 on the sixth surface 2113 faces the inner surface of the first plate portion 1011 of the stop portion 101; the mating hole 2111 on the eighth surface 2115 faces the inner surface of the third plate portion 1013. The axis of the mating hole 2111 is perpendicular to the axis of the through hole 301.

[0068] See Figure 10The detection unit 21 also includes a first adapter plate 214 and a second adapter plate 215. Both the first adapter plate 214 and the second adapter plate 215 have insertion portions 2141, and the circuit board 22 has insertion holes 223 corresponding to the two insertion portions 2141 respectively. The insertion portions 2141 are at least partially located within the insertion holes 223. The pins of the light source module 212 are soldered to the insertion portions 2141 of the first adapter plate 214, and the pins of the detection probe 213 are soldered to the insertion portions 2141 of the second adapter plate 215. Both the first adapter plate 214 and the second adapter plate 215 are soldered to the circuit board 22.

[0069] See Figure 11 There is a fourth gap 500 between the inner surface of the second plate portion 1012 and the outer surface of the first adapter plate 214 of the detection housing 211, and there is a fifth gap 600 between the inner surface of the fourth plate portion 1014 and the inner surface of the second adapter plate 215 of the detection housing 211. The spacing of the fourth gap 500 along the third direction LL is equal to the spacing of the fifth gap 600 along the third direction LL, and the spacing of the fourth gap 500 along the third direction LL is not greater than the spacing of the second gap 300 along the second direction WW.

[0070] Figure 13 Another embodiment of this application is shown, such as Figure 13 As shown, the baffle 101 includes a baffle 201 located on one side of the detection unit 21 along its length. The detection unit 21 is at least partially located within the first cavity 1001. The baffle 201 is a straight plate, and its length direction is consistent with the length direction of the detection unit 21. Of course, the baffle 201 can also be an arc-shaped plate, a bent plate, etc.

[0071] Figure 16 Another embodiment of this application is shown, such as Figure 16 As shown, the baffle 101 includes baffles 201 located on both sides along the length of the detection unit 21. The two baffles 201 are flat plates, and their length direction is consistent with the length direction of the detection unit 21. Of course, the two baffles 201 can also be curved plates, bent plates, etc.

[0072] Figure 19 Another embodiment of this application is shown, wherein the stop includes a semi-ring structure 401. The detection unit 21 is at least partially located within the first cavity 1001.

[0073] like Figure 7As shown, the gas detection device also includes a waterproof and breathable membrane 40, which covers at least a portion of the ventilation section 30. The waterproof and breathable membrane 40 is located inside the housing 10, thus making it less susceptible to external environmental influences and damage. Specifically, the waterproof and breathable membrane 40 can be adhered to the first surface 1111 of the first wall portion 111; or, part of the waterproof and breathable membrane 40 can be disposed within a mounting groove and pressed and fixed by the baffle 101, while the other part can be adhered to the first surface 1111 of the first wall portion 111.

[0074] The above embodiments are only used to illustrate the present invention and are not intended to limit the technical solutions described in the present invention. The understanding of this specification should be based on those skilled in the art. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still make modifications or equivalent substitutions to the present invention. All technical solutions and improvements that do not depart from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. A gas detection device, characterized in that, It includes a housing and a detection unit. The housing has a first sidewall with a vent. The vent has a through hole that penetrates the first sidewall and communicates with the outside of the gas detection device. The outer shell has an inner cavity and a baffle. The baffle is connected to the first sidewall and divides the inner cavity into a first cavity and a second cavity. The vent is located on the periphery of the first cavity. The detection unit has a gas chamber and a second sidewall located around the gas chamber. The second sidewall has a hole with a mating hole that penetrates the second sidewall and is located in the first cavity. The mating hole communicates with the gas chamber and with the through hole. The hole and the stop are opposite to each other and are in clearance fit. The mating hole communicates with the first cavity, and the through hole communicates with the first cavity. The mating hole and the through hole are not co-directional. The gas detection device includes a circuit board, and the detection unit is connected to the circuit board. The circuit board includes a third surface and a fourth surface located on opposite sides of its thickness direction. The housing includes a first housing and a second housing. The circuit board is fixed to the second housing. The first housing includes a first sidewall and a first wall portion. The second housing includes a second wall portion. The first wall portion and the stop portion are located on the side where the third surface is located. The second wall portion is located on the side where the fourth surface is located. The detection unit includes a detection housing, which is at least partially located around the gas chamber. The detection housing includes a sixth surface, and the mating hole penetrates the sixth surface. The first sidewall and the baffle are integrally formed. The baffle includes a first plate, and there is a second gap between the inner surface of the first plate and the sixth surface. There is a gap between the baffle and the circuit board. The value of the gap along a first direction is less than the value of the second gap along a second direction. The first direction is the height direction of the gas detection device, and the second direction is the width direction of the gas detection device.

2. The gas detection device according to claim 1, characterized in that, The baffle extends from the first sidewall toward the inner cavity; The baffle has an annular structure, with the first cavity located inside the baffle and the second cavity located outside the baffle.

3. The gas detection device according to claim 2, characterized in that, The baffle includes a third sidewall, which is parallel to the height direction of the gas detection device. Along the height direction of the gas detection device, the first projection of the baffle on the first sidewall is located around the vent.

4. The gas detection device according to claim 1, characterized in that, The first sidewall includes a first peripheral wall extending vertically from the first wall portion, the stop portion is connected to the first wall portion, the first peripheral wall is located on the periphery of the second cavity, and the stop portion is located inside the first peripheral wall.

5. The gas detection device according to claim 4, characterized in that, Along the height direction of the gas detection device, the circuit board is away from the first wall relative to the stop portion.

6. The gas detection device according to claim 5, characterized in that, The detection housing includes a second sidewall; along the height direction of the gas detection device, the circuit board is located away from the first sidewall relative to the detection housing.

7. The gas detection device according to claim 1, characterized in that, The detection unit includes a light source module and a detection probe. Both the light source module and the detection probe are connected to the detection housing. The light source module is at least partially located on the periphery of the air chamber, and the detection probe is at least partially located in the air chamber. The light source module is at least partially located in the first cavity, the detection probe is at least partially located in the first cavity, and the circuit board is located away from the first wall relative to the light source module and the detection probe.

8. The gas detection device according to claim 1, characterized in that, The first housing is fixedly connected to or limited by the second housing, or the outer shell is a single piece; The first housing has a first inner cavity, and the stop is at least partially located in the first inner cavity, the first inner cavity including at least a portion of the first cavity and at least a portion of the second cavity; The second housing has a second inner cavity for accommodating the circuit board; The inner cavity includes the first inner cavity and the second inner cavity.

9. The gas detection device according to claim 8, characterized in that, Along the height direction of the gas detection device, the baffle has a first axis in the first projection of the first housing, the first housing has a first diagonal, and the first axis coincides with the first diagonal; The detection housing includes a second sidewall; the detection housing has a second projection on the second housing along the height direction of the gas detection device, the second projection has a second axis, the second housing has a second diagonal, the second axis of the second projection coincides with the second diagonal of the second housing, and the first diagonal is parallel to the second diagonal.

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