Detection device

Abstract

A detection device comprises a circuit board, a light source module, a detection probe and a shell, and at least one of the light source module and the detection probe is electrically connected with the circuit board; the shell is provided with an optical gas chamber, the light source module is partially located in the optical gas chamber, the detection probe is partially located in the optical gas chamber, the shell is provided with a first vent hole, the first vent hole is in gas communication with the outside of the detection device, and the first vent hole is in gas communication with the optical gas chamber; the shell comprises an inner surface, an outer surface and a positioning part, the outer surface is far away from the optical gas chamber relative to the inner surface, and the positioning part protrudes from the outer surface to the direction far away from the optical gas chamber; the circuit board is provided with a first positioning hole, and the positioning part is connected with a hole wall corresponding to the first positioning hole. According to the detection device, the circuit board is connected with the shell through the circuit board and the positioning part on the shell, so that the connection firmness of the circuit board and the shell is improved.

Description

Technical Field

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

[0002] The detection device includes a housing, a light source module, a circuit board and a detection probe. The circuit board is connected to the outer surface of the housing, and the connection method is generally bonding, which has a weak firmness. Therefore, it is necessary to strengthen the firmness of the connection between the circuit board and the housing. Summary of the invention

[0003] In order to solve the above-mentioned problem, the present application provides a detection device, in which the connection firmness between the circuit board and the housing is improved.

[0004] A detection device comprises a circuit board, a light source module, a detection probe and a housing, wherein at least one of the light source module and the detection probe is electrically connected to the circuit board;

[0005] The housing has an optical air chamber, the light source module has a portion located in the optical air chamber, the detection probe has a portion located in the optical air chamber, the housing has a first vent hole, the first vent hole is in gaseous communication with the outside of the detection device, and the first vent hole is in gaseous communication with the optical air chamber;

[0006] The housing comprises an inner surface, an outer surface and a positioning portion, the outer surface is relatively far away from the optical air chamber, and the positioning portion is protruded from the outer surface in a direction away from the optical air chamber;

[0007] The circuit board has a first positioning hole, and the positioning portion is connected to a hole wall corresponding to the first positioning hole.

[0008] In the present application, the housing is connected to the circuit board via the positioning portion, which can improve the connection firmness between the two. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 is a schematic diagram of the detection device of the present application;

[0010] Figure 2 yes Figure 1 Exploded diagram of part of the structure;

[0011] Figure 3 yes Figure 2 Schematic diagram from another perspective;

[0012] Figure 4 yes Figure 1 A three-dimensional cross-sectional schematic diagram of a part of the structure;

[0013] Figure 5 It is an exploded schematic diagram of a partial structure of a device provided in one embodiment of the present application;

[0014] Figure 6is a schematic structural diagram of a first housing;

[0015] Figure 7 It is a schematic diagram of a partial structure of a detection device viewed from above;

[0016] Figure 8 Yes Figure 7 Schematic diagram showing the relationship between the first straight line and the second straight line. DETAILED DESCRIPTION

[0017] 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.

[0018] 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.

[0019] At present, the relevant detection device 9 includes a circuit board 2 and a housing 1. The housing 1 has an optical air chamber 11. The circuit board 2 and the housing 1 are generally connected by bonding, and the connection strength is relatively weak.

[0020] In order to improve the connection firmness between the circuit board 2 and the housing 1, the present application provides a detection device 9, referring to Figure 1 and Figure 2 As shown, the detection device 9 includes a light source module 5, a housing 1, a circuit board 2 and a detection probe 6, at least one of the light source module 5 and the detection probe 6 is electrically connected to the circuit board 2. The housing 1 has an optical air chamber 11, the light source module 5 has a portion located in the optical air chamber 11, and the detection probe 6 has a portion located in the optical air chamber 11. The housing 1 has a first vent 12, the first vent 12 is gaseously connected to the outside of the detection device 9, and the first vent 12 is gaseously connected to the optical air chamber 11. The housing 1 includes an inner surface 15 and an outer surface 16, and the outer surface 16 is away from the optical air chamber 11 relative to the inner surface 15. The housing 1 in the present application also includes a positioning portion 161, and the positioning portion 161 is protruded from the outer surface 16 in a direction away from the optical air chamber 11. At the same time, the circuit board 2 has a first positioning hole 212. The positioning portion 161 is connected to the hole wall corresponding to the first positioning hole 212. That is, the housing 1 is connected to the hole wall corresponding to the first positioning hole 212 through the positioning portion 161. In the present application, the housing 1 is connected to the circuit board 2 via the positioning portion 161, which can improve the connection strength between the two. In addition, the design of the positioning portion 161 prevents relative movement between the housing 1 and the circuit board 2, especially when subjected to external loads, such as external force, vibration, etc.

[0021] Reference Figure 2As shown, the housing 1 has a length direction L, a lateral direction W, and a height direction H. In some embodiments, referring to Figure 2 As shown, the outer surface 16 includes an end surface 160, and the end surface 160 is located at one end of the length direction L. Along the length direction L, the positioning portion 161 is protruded from the end surface 160 in a direction away from the optical air chamber 11. The circuit board 2 includes a first circuit board 210, and the light source module 5 or the detection probe 6 is electrically connected to the first circuit board 210. The light source module 5 or the detection probe 6 is directly connected to the first circuit board 210. Along the length direction L, the circuit board 2 is located at one end of the housing 1, and the protruding direction of the positioning portion 161 intersects with the thickness direction of the circuit board 2. The intersecting structural design can further fix the positional relationship between the positioning portion 161 and the circuit board 2 and increase the connection firmness.

[0022] Further, refer to Figure 2 and Figure 3 As shown, in some embodiments, the end surface 160 includes a first end surface 162 and a second end surface 163, the first end surface 162 and the second end surface 163 are respectively located at two ends of the housing 1 along the length direction L, and the positioning portion 161 includes a first positioning portion 1611 and a second positioning portion 1612, the first positioning portion 1611 and the second positioning portion 1612 are respectively protruded from the first end surface 162 and the second end surface 163 in a direction away from the optical air chamber 11. The first circuit board 210 includes a first sub-circuit board 211 and a second sub-circuit board 221, the first sub-circuit board 211 is perpendicular to the length direction L, the first sub-circuit board 211 is arranged facing the first end surface 162, the second sub-circuit board 221 is perpendicular to the length direction L, and the second sub-circuit board 221 is arranged facing the second end surface 163. In some embodiments, in order to better improve the connection firmness between the circuit board 2 and the shell 1, the first sub-circuit board 211 is vertically arranged with the first positioning portion 1611, and the second sub-circuit board 221 is vertically arranged with the second positioning portion 1612. The vertical arrangement design can withstand external loads to the greatest extent to prevent relative movement between the first circuit board 210 and the positioning portion 161.

[0023] In order to make the structure of the detection device 9 more solid, in some embodiments, reference Figure 2 and Figure 4As shown, the detection device 9 includes a second circuit board 4, and the first sub-circuit board 211 and the second sub-circuit board 221 are respectively electrically and physically connected to the second circuit board 4. The second circuit board 4 has a fourth positioning hole 42 and a fifth positioning hole 43, the first sub-circuit board 211 is provided with a first plug-in portion 213, and the second sub-circuit board 221 is provided with a second plug-in portion 223. Specifically, the first plug-in portion 213 and the second plug-in portion 223 include a rectangular parallelepiped or ellipsoidal plug-in portion, such as a cylindrical shape, the first plug-in portion 213 and the first sub-circuit board 211 are an integral part, the second plug-in portion 223 and the second sub-circuit board 221 are an integral part, and the first plug-in portion 213 and the second plug-in portion 223 are respectively connected to The second circuit board 4 is electrically and physically connected. Further, the first plug-in portion 213 is at least partially located in the fourth positioning hole 42, and the first plug-in portion 213 is connected to the hole wall forming the fourth positioning hole 42. The second plug-in portion 223 is at least partially located in the fifth positioning hole 43, and the second plug-in portion 223 is connected to the hole wall forming the fifth positioning hole 43. Specifically, the connection method includes a fixed connection or a limited connection, wherein the fixed connection includes welding or using a nut or gluing, and the limited connection includes setting a positioning column connection.

[0024] In other embodiments, reference Figure 5 As shown, the outer surface 16 includes a bottom surface 18, the bottom surface 18 faces the first vent hole 12, and the positioning portion 161 is located on the bottom surface 18, and the positioning portion 161 protrudes from the bottom surface 18 in a direction away from the optical air chamber 11; the light source module 5 and the detection probe 6 are both electrically connected to the second circuit board 4, the second circuit board 4 is parallel to the length direction L, and the second circuit board 4 is arranged facing the bottom surface 18; the protruding direction of the positioning portion 161 intersects with the thickness direction of the second circuit board 4, so that the second circuit board 4 and the shell 1 are fixed to the second circuit board 4 through the positioning portion 161, so as to strengthen the firmness of the connection between the second circuit board 4 and the shell 1.

[0025] In some embodiments, reference Figure 2 As shown, the housing 1 includes more than two positioning portions 161, and the more than two positioning portions 161 are symmetrically distributed to improve the stability of the connection between the circuit board 2 and the housing 1. Figure 2 As shown, the housing 1 includes four first positioning portions 1611, and the four first positioning portions 1611 are symmetrically arranged about the housing axis. In other embodiments, the housing 1 may also include three, five, or other numbers of positioning portions 161, as long as the positioning portions 161 can be symmetrically arranged. In this way, each columnar positioning portion 161 is evenly stressed, thereby increasing the service life of the columnar positioning portion 161.

[0026] In some embodiments, the positioning portion 161 is in the shape of an elongated strip, a column, a strip, or a cone, and the cross section of the positioning portion 161 is in the shape of a circle, a triangle, a quadrilateral, or other polygon. Figure 3 As shown, the positioning portion 161 has a cylindrical structure. In the present application, as long as the positioning portion 161 can be inserted into the first positioning hole 212 of the circuit board 2, so that the housing 1 is connected to the circuit board through the positioning portion 161, the specific shape of the positioning portion 161 is not limited.

[0027] In some embodiments, the positioning portion 161 is at least partially located in the first positioning hole 212, and the positioning portion 161 is fixedly connected or position-limitedly connected to the hole wall corresponding to the first positioning hole 212. For example, the positioning portion 161 and the hole wall corresponding to the first positioning hole 212 are interference fit, or the positioning portion 161 and the hole wall corresponding to the first positioning hole 212 are bonded by an adhesive, or the positioning portion 161 and the hole wall corresponding to the first positioning hole 212 are welded.

[0028] In some embodiments, reference Figure 3 As shown, in order to more stably fix the light source module 5 , the detection device 9 includes a mounting cup 7 , the mounting cup 7 has a third through hole 72 , the light source module 5 is at least partially located in the third through hole 72 , and the mounting cup 7 is at least partially located at the periphery of the optical air chamber 11 .

[0029] Further, in some embodiments, referring to Figure 2 As shown, the housing 1 has a first through hole 13 and a first hole groove 133, the first through hole 13 is arranged to penetrate the housing 1 along the transverse direction W, the first through hole 13 is connected to the optical air chamber 11, and the first through hole 13 and the first hole groove 133 are arranged coaxially, the first through hole 13 and the first hole groove 133 are connected, the mounting cup 7 is at least partially located in the first hole groove 133, the mounting cup 7 includes a second step 71, the second step 71 is protruded from the mounting cup 7 in the direction away from the optical air chamber 11, and the second step 71 is connected to the wall of the first hole groove 133. Specifically, the connection includes a sealed connection or an interference fit connection or a threaded connection, wherein the sealed connection includes a connection by a sealing ring or a sealant connection, and the second step 71 is used to limit the position of the mounting cup 7 and the first through hole 13, so as to facilitate the mounting cup 7 to be better installed with the housing 1.

[0030] In some embodiments, the light source module 5 includes a first pin 51, such as Figure 2 As shown, the light source module 5 has two first pins 51, wherein the first pins 51 are long strips or columns, the first sub-circuit board 211 has a first corner hole 214, the first pins 51 are connected to the hole wall of the first corner hole 214, and the light source module 5 is connected to the first sub-circuit board 211 through the first pins 51. Specifically, the connection method includes fixed connection or limited connection. In order to improve the detection accuracy of the detection device 9, in some embodiments, such as Figure 3As shown, the mounting cup 7 includes a reflective surface 73, which faces the optical air chamber 11 and is arc-shaped. Furthermore, the focus or center point of the reflective surface 73 coincides with the receiving surface of the detection probe 6, and is used to converge light and directly reflect the light to the detection probe 6, so as to reduce the number of reflections of the light in the optical air chamber 11 and reduce light loss. Furthermore, the reflective surface 73 can be coated with a gold coating to increase the reflectivity.

[0031] In order to make the detection probe 6 more firmly fixed, in some embodiments, the detection probe 6 includes a second pin 62, such as Figure 3 As shown, the detection probe 6 has four second pins 62, wherein the second pins 62 are bar-shaped or columnar, the second sub-circuit board 221 has a second corner hole 224, the detection probe 6 is connected to the second sub-circuit board 221, and the detection probe 6 and the second sub-circuit board 221 are connected to the hole wall of the second corner hole 224 through the second pins 62. Specifically, the connection method includes a fixed connection or a limited connection, for example, the second pin 62 and the hole wall corresponding to the second corner hole 224 are interference fit, or the second pin 62 and the hole wall corresponding to the second corner hole 224 are bonded by an adhesive, or the second pin 62 and the hole wall corresponding to the second corner hole 224 are welded.

[0032] In order to further limit the position of the detection probe 6 and the housing 1, in some embodiments, as Figure 3 As shown, the detection probe 6 includes a first step 61, which protrudes from the detection probe 6 in the direction away from the optical gas chamber 11. The shell 1 has a second through hole 14 and a second hole groove 143. The second through hole 14 is arranged to penetrate the shell 1 along the transverse direction W. The second through hole 14 is connected to the optical gas chamber 11, and the second through hole 14 and the second hole groove 143 are coaxially arranged. The second through hole 14 and the second hole groove 143 are connected. The detection probe 6 is at least partially located in the second hole groove 143, and the first step 61 is connected to the wall of the second hole groove 143. Specifically, the connection includes connection by a sealing ring, connection by a sealant, connection by interference fit, or connection by threading.

[0033] Further, in order to prevent the detection probe 6 from rotating in the second through hole 14, in some embodiments, as Figure 3 As shown, the second end face 163 has a notch 144, which is recessed from the side wall of the second hole groove 143 in a direction away from the second hole groove 143, and the notch 144 is connected to the second hole groove 143. The first step 61 also includes a protrusion 63, which is protruding from the side wall of the first step 61 in a direction away from the first step 61, and the protrusion 63 is at least partially located in the notch 144, and the protrusion 63 cooperates with the notch 144.

[0034] In order to prevent the detection device 9 from being easily affected and damaged by the external environment during detection, in some embodiments, the detection device 9 includes a shell 8, and the shell 8 has a protective effect on the detection device 9. Figure 2 As shown, the shell 8 includes a first shell 81 and a second shell 82. The first shell 81 and the second shell 82 are arranged along the height direction H. The first shell 81 and the second shell 82 are connected. Specifically, the first shell 81 and the second shell 82 are connected by bonding or snapping.

[0035] Further, in some embodiments, referring to Figure 2 as well as Figure 6 As shown, the second housing 82 is provided with a plurality of third positioning portions 821, the second circuit board 4 has a plurality of third positioning holes 41, the third positioning portions 821 cooperate with the third positioning holes 41 to fix the second circuit board 4, the second housing 82 has a second inner cavity 822, the second circuit board 4 is located in the second inner cavity 822, specifically, preferably four third positioning portions 821 and four third positioning holes 41. In some embodiments, the first housing 81 has a first inner cavity 811 and a top surface 84, the first inner cavity 811 is connected to the second inner cavity 822, the first inner cavity 811 and the second inner cavity 822 form an inner cavity 80, the top surface 84 is away from the second circuit board 4 relative to the first inner cavity 811, the top surface 84 has a plurality of second vents 83, the second vents 83 are in gas communication with the first inner cavity 811, and the second vents 83 are in gas communication with the external air of the detection device 9.

[0036] The principle of the entire detection device 9 is explained as follows. Different gases have different absorption spectra due to differences in their molecular structure, concentration and energy distribution. When detecting the target gas, the absorption of the target gas to the light of the characteristic wavelength conforms to the Lambert-Beer law. Taking the light source module 5 as an infrared light source as an example, when the light source module 5 emits an infrared beam through the optical air chamber 11 to reach the detection probe 6, the target gas will absorb infrared rays of a specific wavelength. In other words, the target gas leaked from the outside will enter the inner cavity 80 through the second vent 83 structure of the shell 8, and then enter the optical air chamber 11 through the first vent 12 on the shell 1. The target gas entering the optical air chamber 11 will absorb infrared light of a characteristic wavelength. In this way, the detection probe 6 can calculate the concentration and other information of the target gas by detecting the change in light intensity.

[0037] In order to improve the detection accuracy of the detection device 9, in some embodiments, referring to Figure 7 As shown, the straight-cylindrical housing 1 needs to have a certain length. In order to increase the length of the housing 1 within a limited space, in this application, reference is made to Figure 8As shown, a first straight line X1 and a second straight line X2 are defined on a first plane M perpendicular to the height direction H of the detection device 9. The housing 1 has a first projection S1 on the plane, and the first straight line X1 extends along the length direction of the first projection S1. The second straight line X2 extends along the width direction or the length direction of the detection device 9, referring to Figure 8 As shown, the width direction of the detection device 9 can refer to the P2 direction diagram, and the length direction of the detection device 9 can refer to the P1 direction diagram, and the second straight line X2 has the same extension direction as the center line of the width direction of the detection device 9. The first straight line X1 is inclined at an acute angle β relative to the second straight line X2. This is conducive to expanding the installation space of the housing 1, and correspondingly, it is also conducive to extending the distance between the light source module 5 and the detection probe 6. In this way, through a longer optical path, the gas can absorb infrared light more fully, which is conducive to improving the detection accuracy of the detection device 9.

[0038] In order to further improve the detection accuracy of the detection device 9, the detection device 9 also includes a waterproof and breathable membrane 17 to prevent impurities such as moisture or dust from entering the housing 1 to affect the detection accuracy. In some embodiments, refer to Figure 2 As shown, the housing 1 has a first vent hole 12, the first vent hole 12 is gaseously connected to the optical air chamber 11, the first vent hole 12 is gaseously connected to the inner cavity 80, the first vent hole 12 and the second vent hole 83 are at least partially aligned, a waterproof breathable membrane 17 is arranged between the first vent hole 12 and the second vent hole 83, the waterproof breathable membrane 17 covers the first vent hole 12, the waterproof breathable membrane 17 may include a waterproof breathable porous material attached to a polyester fiber cloth processed by a specific process, and the pore size is at the nanometer level, so that it can play a role of waterproof, dustproof and breathable. The use of the waterproof breathable membrane 17 also prolongs the service life of the product. The waterproof breathable membrane 17 can cover the first vent hole 12 by pasting. Specifically, four first vent holes 12 are preferably arranged in sequence on the housing 1 along the lateral direction W of the detection device 9.

[0039] The assembly of the detection device 9 comprises the following steps:

[0040] First, the light source module 5 is installed into the mounting cup 7 . The mounting cup 7 is installed in the first hole groove 133 . The mounting cup 7 is connected to the groove wall of the first hole groove 133 .

[0041] The light source module 5 is electrically connected to the first sub-circuit board 211, and adhesive is applied to the first positioning portion 1611, and then the first positioning portion 1611 on the housing 1 is passed through the first positioning hole 212 on the first sub-circuit board 211, and the first sub-circuit board 211 is connected to the housing 1 through the first positioning portion 1611; the detection probe 6 is electrically connected to the second sub-circuit board 221, and the first step 61 of the detection probe 6 is placed in the second hole groove 143, so that the protrusion 63 of the first step 61 is located at the notch 144, and the detection probe 6 is at least partially located in the second through hole 14, and adhesive is applied to the second positioning portion 1612, and then the second positioning portion 1612 is passed through the second positioning hole 222, and the second sub-circuit board 221 is connected to the housing 1 through the second positioning portion 1612. The connection firmness between the housing 1 and the circuit board 2 is achieved.

[0042] The first plug-in portion 213 of the first sub-circuit board 211 is inserted into the fourth positioning hole 42 on the second circuit board 4, and the first plug-in portion 213 is electrically connected to the second circuit board 4. At the same time, the second plug-in portion 223 of the second sub-circuit board 221 is inserted into the fifth positioning hole 43 on the second circuit board 4, and the second plug-in portion 223 is electrically connected to the second circuit board 4. The first sub-circuit board 211 is electrically connected to the second circuit board 4 through the first plug-in portion 213, and the second sub-circuit board 221 is electrically connected to the second circuit board 4 through the second plug-in portion 223.

[0043] The housing 1 together with the light source module 5 , the mounting cup 7 , the detection probe 6 , the first sub-circuit board 211 , the second sub-circuit board 221 and the second circuit board 4 are integrally installed in the outer shell 8 , making the installation more convenient.

[0044] 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 detection device, characterized in that: It comprises a circuit board, a light source module, a detection probe and a housing, wherein at least one of the light source module and the detection probe is electrically connected to the circuit board; The housing has an optical air chamber, the light source module has a portion located in the optical air chamber, the detection probe has a portion located in the optical air chamber, the housing has a first vent hole, the first vent hole is in gaseous communication with the outside of the detection device, and the first vent hole is in gaseous communication with the optical air chamber; The housing comprises an inner surface, an outer surface and a positioning portion, the outer surface is relatively far away from the optical air chamber, and the positioning portion is protruded from the outer surface in a direction away from the optical air chamber; The circuit board has a first positioning hole, and the positioning portion is connected to a hole wall corresponding to the first positioning hole.

2. The detection device according to claim 1, characterized in that The outer surface includes an end surface, the housing has a length direction, the end surface is located at one end of the length direction, and along the length direction, the positioning portion is protruded from the end surface in a direction away from the optical air chamber; The circuit board includes a first circuit board, the light source module or the detection probe is electrically connected to the first circuit board, and the light source module or the detection probe is directly connected to the first circuit board; Along the length direction, the first circuit board is located at one end of the housing, and the protruding direction of the positioning portion intersects with the thickness direction of the first circuit board.

3. The detection device according to claim 2, characterized in that: The end surface includes a first end surface and a second end surface, the first end surface and the second end surface are respectively located at two ends of the housing along the length direction, the positioning portion includes a first positioning portion and a second positioning portion, the first positioning portion and the second positioning portion are respectively protruded from the first end surface and the second end surface in a direction away from the optical air chamber; The first circuit board includes a first sub-circuit board and a second sub-circuit board, the first sub-circuit board is perpendicular to the length direction and is arranged facing the first end surface, the second sub-circuit board is perpendicular to the length direction and is arranged facing the second end surface; The first sub-circuit board is disposed perpendicularly to the first positioning portion, and the second sub-circuit board is disposed perpendicularly to the second positioning portion.

4. The detection device according to claim 1, characterized in that: The outer surface comprises a bottom surface, the bottom surface faces the first vent hole, the positioning portion is located on the bottom surface, and the positioning portion is protruded from the bottom surface in a direction away from the optical air chamber; The circuit board includes a second circuit board, the light source module and the detection probe are both electrically connected to the second circuit board, the second circuit board is parallel to the length direction, and the second circuit board is arranged facing the bottom surface; A protruding direction of the positioning portion intersects with a thickness direction of the second circuit board.

5. The detection device according to claim 1, characterized in that: The housing includes more than two positioning portions, and the more than two positioning portions are symmetrically distributed.

6. The detection device according to claim 1, characterized in that: The positioning portion is fixedly connected or limit-connected to a hole wall corresponding to the first positioning hole.

7. The detection device according to claim 2, characterized in that: The detection device includes a mounting cup having a third through hole, the light source module is at least partially located in the third through hole, and the mounting cup is at least partially located at the periphery of the optical air chamber. The optical air chamber includes a reflective surface facing the optical air chamber, and the reflective surface is arc-shaped.

8. The detection device according to claim 3, characterized in that: The second end surface has a notch, the detection probe includes a first step, the first step is provided with a protrusion, and the protrusion is at least partially located in the notch.

9. The detection device according to claim 1, characterized in that: A plane perpendicular to the height direction of the detection device is defined as a first plane, and a first straight line and a second straight line are provided on the first plane; the housing has a first projection on the first plane, and the first straight line extends along the length direction of the first projection; The second straight line extends along the width direction or the length direction of the detection device; the first straight line is inclined at an acute angle relative to the second straight line.

10. The detection device according to any one of claims 1 to 9, characterized in that: The detection device includes a shell, the shell has an inner cavity, the circuit board and the shell are both located in the inner cavity, the shell has a second ventilation hole, the second ventilation hole is connected to the inner cavity, the first ventilation hole is connected to the inner cavity gas, the second ventilation hole and the first ventilation hole are at least partially aligned, the detection device also includes a waterproof breathable membrane, the waterproof breathable membrane is arranged between the first ventilation hole and the second ventilation hole, and the waterproof breathable membrane covers the first ventilation hole.

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