WO2024193531A1 - Detection device - Google Patents

Abstract

A detection device, comprising a housing, a detection assembly, and a circuit board. The housing comprises a main body part and an insertion part; the detection assembly is at least partially located in the main body part; the circuit board is at least partially located in the main body part; the insertion part is used for insertion of a cable; the insertion part is connected to the main body part; the housing comprises a blocking part; the blocking part is connected to the main body part; and the insertion part and the blocking part are both located outside the main body part. A plane perpendicular to the height direction of the detection device is defined as a projection plane. In the height direction of the detection device, the orthographic projection of the insertion part on the projection plane is a first projection, and the orthographic projection of the blocking part on the projection plane is a second projection, wherein the second protection at least partially overlaps with the first projection. In the detection device of the present application, the blocking part can block external impurities, thereby reducing the effect of external impurities on a position where the cable is inserted into the detection device.

Description

Detection device

This application requires:

Submitted to the China Patent Office on March 21, 2023, application number 202310284550.X, invention name “Detection Device”;

Submitted to the China Patent Office on March 21, 2023, application number 202310307307.5, invention name “Detection Device”;

Submitted to the China Patent Office on March 21, 2023, application number 202310305949.1, invention name “Detection Device”;

The priorities of the above three Chinese patent applications are incorporated in this application by reference in their entirety.

Technical Field

The present application relates to the field of detection technology, and in particular, to a detection device.

Background Art

The plug-in part of the cable and the detection device is plugged in, and foreign matter easily enters the plug-in part, affecting the connection between the cable and the detection device. For example, when the detection device is used to detect refrigerant, condensed water may form on the surface of the detection device, and the condensed water flows to the plug-in part of the cable and the detection device, which may easily cause a short circuit. Therefore, it is necessary to improve the structure of the detection device.

Summary of the invention

The present application provides a detection device capable of reducing the influence of external impurities on the connection between a cable and a plug-in part.

A detection device comprises a housing, a detection component and a circuit board, wherein the housing comprises a main body and a plug-in portion, the detection component is at least partially located inside the main body, the circuit board is at least partially located inside the main body, the plug-in portion is used to plug a cable, and the plug-in portion is connected to the main body; the housing comprises a blocking portion, the blocking portion is connected to the main body, and the plug-in portion and the blocking portion are both located outside the main body;

A plane perpendicular to the height direction of the detection device is defined as a projection plane. Along the height direction of the detection device, the orthographic projection of the plug-in portion on the projection plane is a first projection, and the orthographic projection of the blocking portion on the projection plane is a second projection. At least part of the second projection coincides with the first projection.

In the detection device of the present application, the housing includes a blocking portion, which is connected to the main body; a plane perpendicular to the height direction of the detection device is defined as a projection plane, the orthographic projection of the plug-in portion on the projection plane is a first projection, the orthographic projection of the blocking portion on the projection plane is a second projection, and at least part of the second projection overlaps with the first projection. In this way, the blocking portion can block external impurities and reduce the impact of external impurities on the plug-in point of the cable and the detection device.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic diagram of a detection device provided in one embodiment of the present application;

FIG2 is a cross-sectional schematic diagram of a detection device provided in one embodiment of the present application;

FIG3 is an exploded schematic diagram of a detection device provided in one embodiment of the present application;

FIG4 is a front cross-sectional view of a detection device provided in one embodiment of the present application;

FIG5 is a cross-sectional perspective view of a detection device provided in one embodiment of the present application;

FIG6 is a perspective view of an assembly of a second main body, a circuit board, and a detection component provided in an embodiment of the present application;

FIG7 is a perspective view of a second main body provided in one embodiment of the present application;

FIG8 is an enlarged schematic diagram of part A in FIG7 ;

FIG9 is a perspective view of the second main body provided by an embodiment of the present application from another angle;

FIG10 is an enlarged schematic diagram of portion B in FIG9 ;

FIG11 is a perspective view of the second main body provided by an embodiment of the present application from another angle;

FIG12 is a three-dimensional portion of a first main body provided in one embodiment of the present application;

FIG13 is a perspective view of the first main body provided by an embodiment of the present application from another angle;

FIG14 is a perspective view of the first main body provided by an embodiment of the present application from another angle;

FIG15 is a schematic diagram of the cooperation between the first main body and the support member provided in one embodiment of the present application;

FIG16 is a schematic projection diagram of an inserting portion and a blocking portion provided in one embodiment of the present application;

FIG. 17 is a top view of a detection device provided in one embodiment of the present application.

DETAILED DESCRIPTION

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.

It should be clear that the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, ordinary technicians in this field can All other embodiments obtained under the premise of sexual labor are within the scope of protection of this application.

The detection device includes a detection component 2, a circuit board 3 and a connection terminal 4. The detection component 2 is connected to the circuit board 3, the circuit board 3 is connected to the connection terminal 4, and the connection terminal 4 is used to connect to the cable. During detection, the detection component 2 outputs a detection signal to the circuit board, and then transmits it to the cable through the connection terminal 4. The circuit board 3 can be provided with a processing component, so that the processing component can process the detection signal before the detection signal is transmitted to the connection terminal.

The detection device includes a housing 1, which protects the detection component 2, the circuit board 3 and the connection terminal 4. The housing 1 includes a bottom wall 12 and a peripheral wall 13. For example, as shown in FIG1, the bottom wall 12 is perpendicular to the height direction H of the detection device, and the peripheral wall 13 is parallel to the height direction H of the detection device. The connection terminal 4 is fixedly connected to the peripheral wall 13 of the housing. In order to facilitate the plugging of the cable, along the height direction H of the detection device, there is a certain distance between the connection between the connection terminal 4 and the peripheral wall 13 and the bottom wall 12. For example, as shown in FIG1, along the height direction of the detection device, the distance between the connection between the connection terminal 4 and the peripheral wall 13 and the bottom wall 12 is H1. Specifically, the connection terminal has a first connection portion 41 connected to the circuit board 3 and a second connection portion 42 connected to the peripheral wall 13 of the housing. The second connection portion 42 extends outward to form a part of the plug-in port, which is used to plug in the cable. In order to facilitate the plugging of the cable, the distance between the second connection portion 42 and the bottom wall of the housing is H1. However, in order to reduce the overall height of the detection device, the related art moves the connection terminal (e.g., "L"-shaped connection terminal) downward relative to the housing as a whole, resulting in a smaller distance between the second connection portion 42 and the bottom wall 12 of the housing, for example, the second connection portion 42 is almost flush with the bottom wall 12. This limits the setting of the plug-in port, making it inconvenient to plug the cable into the detection device.

The first aspect of the present application provides a detection device, such as shown in Figures 1 to 3, including a housing 1, a detection component 2, a circuit board 3 and a connecting terminal 4. In some embodiments, the housing 1 has an inner cavity 11, and the detection component 2 and the circuit board 3 are both located in the inner cavity 11, and the inner cavity 11 is gaseously connected to the outside of the detection device, such as shown in Figure 2. The housing 1 includes a bottom wall 12 and a peripheral wall 13, and the bottom wall 12 and the peripheral wall 13 are connected, and the bottom wall 12 and the peripheral wall 13 are both located on the periphery of the inner cavity 11. Along the height direction of the detection device, the peripheral wall 13 is at least partially located on both sides of the circuit board 3 with the bottom wall 12, and the peripheral wall 13 is at least partially located on the same side of the circuit board 3 with the bottom wall 12. The connecting terminal 4 has a first connecting portion 41 and a second connecting portion 42, the first connecting portion 41 is connected to the circuit board 3, and the second connecting portion 42 is connected to the peripheral wall 13; the direction perpendicular to the bottom wall 12 is defined as the height direction H of the detection device, and along the height direction H of the detection device, the detection component 2 is away from the bottom wall 12 relative to the circuit board 3, and the second connecting portion 42 is away from the bottom wall 12 relative to the circuit board 3 .

In some embodiments, the connection terminal 4 has a first connection portion 41, a second connection portion 42 and a transition portion 43, and the first connection portion 41 and the second connection portion 42 are both connected to the transition portion 43. The first connection portion 41 is connected to the circuit board 3, and the second connection portion 42 is connected to the peripheral wall 13. Along the height direction H of the detection device, the detection component 2 is away from the bottom wall 12 relative to the circuit board 3, and the second connection portion 42 is away from the bottom wall 12 relative to the transition portion 43. In the detection device of the present application, the transition portion 43 allows the second connection portion 42 to have a larger spacing relative to the bottom wall 12, so that the height of the detection device is smaller. Specifically, assuming that along the height direction of the detection device, the distance that the transition portion 43 extends from the second connection portion 42 toward the bottom wall 12 is H ₀ , then the distance between the second connection portion 42 and the bottom wall 12 is at least H _0. In some embodiments, the height direction of the detection device is perpendicular to the thickness direction of the circuit board.

The detection component is installed on the circuit board. Along the height direction H of the detection device, the height of the detection component is H2, the thickness of the circuit board is H3, and the sum of the heights of the detection component and the circuit board is H2+H3 (ignoring the floating height of the detection component relative to the circuit board). In the related art, the connecting terminal limits the installation position of the circuit board, so that the installation height of the circuit board is at least equal to the distance H1 between the connecting terminal and the bottom wall (ignoring the thickness of the connecting terminal itself). In order to accommodate the detection component and the circuit board, and to achieve the connection between the circuit board and the connecting terminal at the same time, the height of the shell is at least equal to H1+H2+H3 (ignoring the thickness of the side wall of the shell).

In some embodiments, the first connection portion 41 is closer to the bottom wall 12 than the second connection portion 42 , as shown in FIGS. 4 and 5 , for example.

In the related art, due to the shape of the connection terminal, along the height direction H of the detection device, the first connection part 41 can only be away from the bottom wall relative to the second connection part 42, or the first connection part 41 is at most flush with the second connection part 42. Due to the limitation of the connection terminal 4, the installation height of the circuit board 3 is at least the distance H1 between the second connection part 42 and the bottom wall 12 along the height direction of the detection device. In the present application, the first connection part 41 is close to the bottom wall relative to the second connection part 42, so that the limitation of the connection terminal on the circuit board can be reduced, and the installation height of the circuit board can be reduced, so that the overall height of the detection device is lower, which is conducive to the miniaturization of the detection device.

Specifically, in some embodiments, the detection component 2 has a top 21 and a bottom 22. Along the height direction H of the detection device, the top 21 is farther away from the bottom wall 12 than the bottom 22. The circuit board 3 has a first surface 31 and a second surface 32. Along the height direction H of the detection device, the first surface 31 is farther away from the bottom wall than the second surface 32. The detection component 2 is mounted on the first surface 31, for example, as shown in FIG. As shown in Figure 5. In the present application, the detection component 2 may include multiple electronic components. For example, for a gas detection device, the detection component may include a detection probe 40 for gas detection, may include a processing component 50 for signal processing, and may also include other electronic components such as capacitors, resistors, filters, etc. The top of the detection component described here refers to the part of all electronic components installed on the circuit board that is farthest from the bottom wall along the height direction of the detection device. For example, as shown in Figures 4 to 6, the top of the processing component 50 is farthest from the bottom wall, then the top of the processing component serves as the top of the detection component. In other cases, along the height direction of the detection device, the top of the detection probe 40 is farthest from the bottom wall, then the top of the detection probe serves as the top of the detection component.

For example, as shown in FIG. 7 , along the height direction H of the detection device, the two outer surfaces of the bottom wall 12 that are oppositely arranged are both planes. The peripheral wall 13 extends outward from the edge of the bottom wall 12 along the height direction H of the detection device. The peripheral wall 13 includes a first wall 131, a second wall 132, a third wall 133 and a fourth wall 134, and the first wall 131, the second wall 132, the third wall 133 and the fourth wall 134 are connected in sequence. Along the length direction L of the detection device, the first wall 131 and the third wall 133 are oppositely arranged, and the first wall 131 and the third wall 133 are respectively located on both sides of the inner cavity 11; along the width direction W of the detection device, the second wall 132 and the fourth wall 134 are oppositely arranged, and the second wall 132 and the fourth wall 134 are respectively located on both sides of the inner cavity 11. The first wall 131, the second wall 132, the third wall 133, the fourth wall 134 and the bottom wall 12 together form a roughly rectangular cavity, which is a part of the inner cavity 11. The second connecting portion 42 is fixedly connected to the first wall 131. As shown in FIG4 , along the height direction of the detection device, the distance between the second connecting portion 42 and the bottom wall 12 is H1, the distance between the top 21 of the detection component and the bottom wall 12 is H2, the distance between the top of the detection component and the bottom of the detection component is H3, the thickness of the circuit board is H4, and H2 is less than H1+H3+H4. For example, as shown in FIG2 , along the height direction of the detection device, the distance between the first connecting portion 41 and the second connecting portion 42 is h, and H2 is approximately equal to H1+H3+H4-h. Accordingly, the height of the housing 1 is at least equal to H1+H3+H4-h (ignoring the thickness of the side wall of the housing). That is, the height to which the detection device is lowered is approximately the distance h between the first connecting portion 41 and the second connecting portion 42.

Specifically, in some embodiments, such as shown in FIG. 5 , the connection terminal 4 includes a first end portion 44, the first end portion 44 includes a first connection portion 41, and the transition portion 43 is connected to the first end portion 44. Along the height direction H of the detection device, the transition portion 43 is at least partially away from the bottom wall 12 relative to the circuit board 3, and the transition portion 43 is at least partially close to the bottom wall relative to the circuit board 3. By setting the transition portion 43, the first connection portion 41 can be lower than the second connection portion 42.

In some embodiments, the first end portion 44 extends from the transition portion 43 toward the inner cavity 11. The first connecting portion 44 passes through the circuit board 3, and the first connecting portion 41 is at least partially located inside the circuit board 3; or, the first connecting portion 41 is connected to the outer surface of the circuit board 3, for example, connected to the second surface 32 of the circuit board 3, and the first connecting portion 41 is close to the bottom wall 12 relative to the circuit board 3. For example, as shown in FIG5 , along the height direction H of the detection device, the circuit board 3 is close to the bottom wall relative to the second connecting portion 42, and the first end portion 44 passes through the circuit board 3. Along the length direction L of the detection device, the projection of the circuit board on the first wall 131 is close to the bottom wall 12 relative to the second connecting portion 42.

In some embodiments, the detection component 2 has a top 21 and a bottom 22, and along the height direction of the detection device, the top 21 is away from the bottom wall relative to the bottom 22; the first end 44 has a terminal 441, and along the height direction H of the detection device, the terminal 441 is close to the bottom wall 12 relative to the top 21 of the detection component. In this way, the interference of the connection terminal 4 on the installation of the housing can be reduced. That is, along the height direction of the detection device, the terminal 441 of the first end 44 is lower than the top 21 of the detection component, as shown in Figure 5.

In some embodiments, the transition portion 43 includes a first section 431 and a second section 432. Along the height direction of the detection device, the first section 431 and the second section 432 are both close to the bottom wall 12 relative to the second connection portion 42, and the first section 431 and the second section 432 are both close to the second connection portion 42 relative to the bottom wall 12. The first section 431 extends from the second connection portion 42 to the bottom wall 12. One end of the first section 431 is connected to the second connection portion 42, and the other end of the first section 431 is connected to the second section 432. In other words, the second section 432 extends from the first section 431 to the first end 44. For example, as shown in FIG. 3, the second section 432 extends toward the middle of the inner cavity along the length direction L of the detection device. One end of the second section 432 is connected to the first section 431, and the other end of the second section 432 is connected to the first end 44. In other words, the first end 44 extends outward from the second section 432. In some embodiments, the extension direction of the first end 44 is parallel to the extension direction of the second section 432. For example, the first end 44 and the second section 432 both extend along the length direction L of the detection device. The transition portion 43 and the first end 44 form an "L"-shaped component. In other embodiments, the extension direction of the first end 44 intersects with the extension direction of the second section 432, such as shown in Figure 5, the second section 432 extends along the length direction L of the detection device, and the first end 44 extends along the height direction H of the detection device, and the extension direction of the first end 44 is perpendicular to the extension direction of the second section 432. The transition portion 43 and the first end 44 form a "U"-shaped component, such as shown in Figure 3. The first connecting portion 41 passes through the circuit board 3, and the first connecting portion 41 is electrically connected to the circuit board 3. In this way, not only can the interference of the connecting terminal 4 on the installation of the circuit board 3 be reduced, the connecting terminal 4 is connected to the circuit board 3 in a through-connection manner, and the connection between the connecting terminal 4 and the circuit board 3 can also be increased. In other words, the connection terminal 4 has a recessed portion, the recessed portion includes a transition portion 43 and a first end portion 44, the recessed portion has a recessed space, the transition portion 43 and the first end portion 44 are both located at the periphery of the recessed space, and at least part of the circuit board 3 is located in the recessed space.

In some embodiments, such as shown in FIG. 2 and FIG. 9 , the housing 1 has a protrusion 14, the protrusion 14 protrudes from at least one of the bottom wall 12 and the peripheral wall 13 to the inner cavity, and the transition portion 43 is at least partially embedded in the protrusion 14, such as shown in FIG. 2 ; or, the transition portion 43 is at least partially embedded in at least one of the bottom wall 12 and the peripheral wall 13. In this way, the connection strength between the connecting terminal 4 and the housing can be increased. Specifically, for example, as shown in FIG. 3 , the transition portion 43 includes a first section 431 and a second section 432; the protrusion 14 includes a first protrusion 141 and a second section 142, the first protrusion 141 protrudes from the peripheral wall 13 to the inner cavity, the second section 142 protrudes from the bottom wall 12 to the inner cavity, the first section 431 is at least partially embedded in the first protrusion 141, and the second section 432 is at least partially embedded in the second protrusion 142. In some other embodiments, the first section 431 is at least partially embedded in the peripheral wall 13 , and the second section 432 is at least partially embedded in the bottom wall 12 .

In some embodiments, such as shown in FIG5 , the detection device includes at least two connection terminals 4, and the at least two connection terminals 4 are arranged along the length direction L or the width direction W of the detection device. Correspondingly, the housing includes at least two protrusions 14, and the at least two protrusions 14 are arranged along the width direction W of the detection device.

In some embodiments, at least a portion of the transition portion 43 is exposed to the inner cavity 11, for example, at least a portion of at least one of the first section 431 and the second section 432 is exposed to the inner cavity 11. In this way, it is convenient to position the connection terminal 4 when the connection terminal 4 is assembled with the housing 1, or when the housing 1 is injection molded outside the connection terminal 4. For example, as shown in FIG. 5 , a portion of the second section 432 of the transition portion 43 of the connection terminal 4 is exposed to the inner cavity 11.

In some embodiments, the connection terminal 4 includes a second end portion 45, the second end portion 45 includes a second connection portion 42 and a protruding portion 46, the protruding portion 46 protrudes from the second connection portion 42 in a direction away from the circuit board 3, and the protruding portion 46 has a free end, and the free end is located outside the inner cavity 11. For example, as shown in FIG. 5, along the length direction L of the detection device, the protruding portion 46 protrudes from the second connection portion 42 in a direction away from the inner cavity 11.

In some embodiments, the second connection portion 42 is embedded in the peripheral wall 13, and the second connection portion 42 is sealed and connected to the peripheral wall 13. For example, as shown in FIG. 3 , the second connection portion 42 is embedded in the first wall 131, and the second connection portion 42 is sealed and connected to the first wall 131. In this way, the cable and the plug can be connected. When the connector is plugged in, foreign matter is reduced from entering the inner cavity 11 through the plugging port to affect the detection. In some embodiments, the transition portion 42 is at least partially sealed and connected to the protruding portion 14. In this way, the isolation between the cavity 161 and the inner cavity 11 can be increased.

In some embodiments, the housing 1 is formed outside the second connection portion 42 and the transition portion 42 by injection molding. When the housing 1 is injection molded by an injection mold, the connection terminal 4 is first placed in a mold cavity for injection molding of the housing 1 and fixed, and then the material for molding the housing 1 is injected, so that a part of the connection terminal 4 can be embedded in the housing 1.

In some embodiments, the housing 1 includes a main body 15 and a plug-in portion 16, and the main body 15 and the plug-in portion 16 are connected. The main body 15 includes a bottom wall 12 and a peripheral wall 13. The main body 15 has an inner cavity 11, and the plug-in portion 16 has a cavity 161. The detection component 2 and the circuit board 3 are both located in the inner cavity 11, and the protrusion 46 is at least partially located in the cavity 161. The second end 45 and the plug-in portion 16 together form a plug-in port for plugging in a cable. The peripheral wall 13 includes a connecting wall portion, which is located between the inner cavity 11 and the cavity 161 along the length direction L of the detection device, and the connecting wall portion is at least partially exposed to the inner cavity 11, and the connecting wall portion is at least partially exposed to the cavity 161. The second connecting portion 42 is located at the connecting wall portion.

In some embodiments, such as shown in FIG. 5 and FIG. 6 , the plug-in portion 16 includes a wall portion 162, which is located at the periphery of the cavity 161; the wall portion 162 includes an inner surface and an outer surface, and the inner surface is closer to the cavity 161 relative to the outer surface. The wall portion 162 has a clamping portion 163, and the clamping portion 163 is formed by being recessed from a part of the outer surface of the wall portion 162 toward the inside of the wall portion 162. The clamping portion 163 includes a groove portion 1631 and a protrusion 1632, and the groove portion 1631 includes a groove. Along the length direction L or the width direction W of the detection component 2, the protrusion 1632 is away from the inner cavity 11 relative to the groove portion 1631. In some embodiments, the protrusion 1632 is fixedly connected to the groove bottom of the groove portion 1631. In some embodiments, the groove bottom of the groove portion 1631 is a plane, and the groove bottom is parallel to the bottom wall 12. In some embodiments, the clamping portion 163 is away from the bottom wall 12 relative to the cavity 161. In this way, the plug of the cable can be engaged with the engaging portion 163 , thereby achieving connection between the plug and the plug-in portion 16 , and achieving a position-limited connection between the cable and the terminal.

In some embodiments, such as shown in FIG. 6 , one end of the plug-in portion 16 is connected to the main body 15, and the other end of the plug-in portion 16 has a first free end 164. Along the length direction L or the width direction W of the detection device, the protrusion 1632 is close to the inner cavity 11 relative to the first free end 164. Specifically, the wall portion 162 includes a fifth wall 1621, a sixth wall 1622, a seventh wall 1623, and an eighth wall 1624. The fifth wall 1621, the sixth wall 1622, the seventh wall 1623, and the eighth wall 1624 are connected in sequence. Along the height direction of the detection device, the fifth wall 1621 is opposite to the seventh wall 1623, and the fifth wall 1621 is opposite to the seventh wall 1623. The walls 1623 are respectively located on both sides of the cavity 161, and the seventh wall 1623 is away from the bottom wall 12 relative to the fifth wall 1621; along the width direction W of the detection device, the sixth wall 1622 and the eighth wall 1624 are arranged opposite to each other, and the sixth wall 1622 and the eighth wall 1624 are respectively located on both sides of the cavity 161. The clamping portion 163 is arranged on the seventh wall 1623. The protrusion 1632 is close to the inner cavity 11 relative to the first free end 164, so that a notch is formed on the seventh wall 1623 that is retracted toward the inner cavity 11 relative to the first free end 164. In this way, the clamping of the plug of the cable with the clamping portion 163 can be facilitated, and the interference of the clamping portion 163 on the plug can be reduced.

The plug-in port of the cable and the detection device is plugged in, and foreign matter is easy to enter the plug-in place, affecting the connection between the cable and the detection device. For example, when the detection device is used to detect refrigerant, condensed water may form on the surface of the detection device, and the condensed water flows to the plug-in place of the cable and the detection device, which may easily cause a short circuit.

To this end, the second aspect of the present application provides a detection device, which includes a housing 1, a detection component 2 and a circuit board 3. The housing 1 includes a main body 15 and a plug-in portion 16. For example, as shown in FIG1 , the detection component 2 is at least partially located inside the main body 15, the circuit board 3 is at least partially located inside the main body 15, the plug-in portion 16 is used to plug in the cable, and the plug-in portion 16 is connected to the main body 15. The housing 1 includes a blocking portion 17, the blocking portion 17 is connected to the main body 15, the plug-in portion 16 and the blocking portion 17 are both located outside the main body 15, and along the height direction H of the detection device, the blocking portion 17 at least partially has an orthographic projection located on the plug-in portion 16, as shown in FIG12 to FIG14 . That is to say, along the height direction H of the detection device, the blocking portion 17 at least partially has an orthographic projection that falls on the plug-in portion 16.

In the present application, the housing 1 includes a blocking portion 17, which is connected to the main body 15; along the height direction H of the detection device, the blocking portion 17 at least partially has a positive projection located at the plug-in portion 16. In this way, the blocking portion 17 can reduce the influence of external impurities on the plug-in connection between the cable and the plug-in portion 16. For example, when water vapor condenses on the surface of the detection device and flows along the surface of the housing 1, the blocking portion 17 can reduce the condensed water from flowing or dripping to the plug-in connection between the cable and the plug-in portion 16. In some embodiments, along the width direction W or the length direction L of the detection device, the plug-in portion 16 and the blocking portion 17 are located on the same side of the inner cavity of the main body 15.

In some embodiments, such as shown in FIG. 16 , a plane perpendicular to the height direction H of the detection device is defined as a projection plane P. Along the height direction H of the detection device, the orthographic projection of the plug-in portion 16 on the projection plane is the first projection S1, and the orthographic projection of the blocking portion 17 on the projection plane is the second projection S2. At least part of the second projection S2 overlaps with the first projection S1, and at least part of the second projection S2 is located outside the first projection S1. On the projection plane, the portion where the second projection S2 overlaps with the first projection S1 is the portion where the blocking portion 17 has an orthographic projection on the plug-in portion 16 along the height direction H of the detection device; The portion of the second projection S2 outside the first projection S1 is the portion where the projection of the blocking portion 17 falls outside the plug-in portion 16 along the height direction H of the detection device. Along the height direction H of the detection device, the portion where the blocking portion 17 has a positive projection on the plug-in portion 16 can block external impurities, making it difficult for the impurities to directly fall into the plug-in portion between the external circuit and the plug-in port; along the height direction H of the detection device, the portion where the projection of the blocking portion 17 falls outside the plug-in portion 16 can reduce the risk of the impurities blocked by the blocking portion 17 falling into the plug-in portion 16 again.

In some embodiments, such as shown in FIG. 12 and FIG. 13, the blocking portion 17 has a first end 171 and a second end 172, and along the width direction W of the detection device, the first end 171 and the second end 172 are located on both sides of the blocking portion 17. In combination with FIG. 16 and FIG. 17, along the height direction H of the detection device, the orthographic projections of the first end 171 and the second end 172 on the projection plane are both located outside the first projection S1. The condensed water blocked by the blocking portion 17 will not flow to the plug-in portion of the external circuit and the plug-in portion 16 again, but will flow to the outside of the plug-in portion 16 through the outlet of the first end 171 or the outlet of the second end 172 of the blocking portion 17.

In some embodiments, the main body 15 includes a side wall 150, which is located at the periphery of the circuit board 3 and the detection component 2, and the side wall 150 includes the bottom wall 12 and the peripheral wall 13 described above, as shown in FIG6. The side wall 150 has a through hole portion 18, and the through hole portion 18 is arranged through the side wall. Along the height direction H of the detection device, the blocking portion 17 is at least partially close to the through hole portion 18 relative to the plug-in portion 16. The through hole portion 18 includes a through hole 181. Specifically, as shown in FIG2, the main body 15 has an inner cavity 11, and the detection component 2 and the circuit board 3 are both located in the inner cavity 11; the through hole 181 is connected to the outside of the detection device, and the through hole 181 is connected to the inner cavity 11. When the detection device detects gas, the gas outside the detection device enters the inside of the main body 15 through the through hole 181 and contacts the detection component 2, so that the detection component 2 can detect the gas. Since the gas enters through the through hole 181, the through hole portion 18 is easy to gather external impurities and also easy to form condensed water. In the present application, along the height direction H of the detection device, the blocking portion 17 is at least partially close to the through hole portion 18 relative to the plug-in portion 16 , so that the blocking portion 17 can better block impurities gathered in the through hole portion 18 or condensed water formed.

In some embodiments, such as shown in FIGS. 2, 3, 7, and 12 to 14, the main body 15 includes a first main body 151 and a second main body 152, the first main body 151 and the second main body 152 are fixedly connected or position-limitedly connected, and the first main body 151 and the second main body 152 are both located at the periphery of the circuit board 3 and the detection component 2. The through hole portion 18 is provided in the first main body 151, the blocking portion 17 is connected to the first main body 151, and the plug-in portion 16 is connected to the second main body 152. The first main body 151 The first sub-inner cavity 153 is provided, the second main body 152 has the second sub-inner cavity 154, and the inner cavity 11 includes the first sub-inner cavity 153 and the second sub-inner cavity 154. When the first main body 151 and the second main body 152 are fixedly connected or position-limitedly connected, the first main body 151 and the second main body 152 are both located at the periphery of the inner cavity 11. In this way, the installation of the main body 15, the circuit board 3, and the detection component 2 is convenient.

Specifically, the first main body 151 includes a top wall 1511 and a first peripheral wall 1512. Along the height direction H of the detection device, the first peripheral wall 1512 extends from the top wall 1511 to the direction close to the second main body 152. The top wall 1511 and the first peripheral wall 1512 are both located at the periphery of the first sub-inner cavity 153. The second main body 152 includes a sub-bottom wall 1521 and a second peripheral wall 1522. Along the height direction H of the detection device, the second peripheral wall 1522 extends from the top wall to the direction close to the first main body 151. The sub-bottom wall 1521 and the second peripheral wall 1522 are both located at the periphery of the second sub-inner cavity 154. In some embodiments, the bottom wall 12 and the sub-bottom wall 1521 refer to the same. Along the height direction H of the detection device, the circuit board 3 is far away from the top wall 1511 relative to the detection component 2, and the detection component 2 is close to the top wall relative to the circuit board 3; the through hole portion 18 is provided on the top wall 1511. The blocking portion 17 is connected to the first peripheral wall 1512, and the plug-in portion 16 is connected to the second peripheral wall 1522. The first peripheral wall 1512 is provided with a first clamping member 155, as shown in FIG15 , for example, and the second peripheral wall 1522 is provided with a second clamping member 156, as shown in FIG7 , for example, the first clamping member 155 is clamped with the second clamping member 156, thereby realizing the limiting connection between the first peripheral wall 1512 and the second peripheral wall 1522.

In some embodiments, such as shown in FIG. 3, FIG. 12 and FIG. 13, the blocking portion 17 includes a first extension portion 173 and a second extension portion 174, the first extension portion 173 is connected to the main body 15, and the second extension portion 174 extends from the first extension portion 173 in a direction away from the plug-in portion 16. For example, as shown in FIG. 3, along the length direction L of the detection device, the first extension portion 173 extends in a direction away from the inner cavity 11; along the height direction H of the detection device, the second extension portion 174 extends in a direction away from the plug-in portion 16. The blocking portion 17 has a water retaining groove 175, which is formed by being recessed inward from the outer surface of the blocking portion 17, and the first extension portion 173 and the second extension portion 174 are both located at the periphery of the water retaining groove 175. Along the height direction H of the detection device, the water retaining groove 175 is away from the plug-in portion 16 relative to the first extension portion 173. The provision of the water retaining groove 175 can play a role in guiding the flow of condensed water. In the present application, since a second extension portion 174 is provided on the blocking portion 17, the second extension portion 174, the first extension portion 173 and the outer surface of the main body portion 15 are surrounded to form a water retaining groove 175, so that condensed water can be guided to the first end 171 or the second end 172 of the blocking portion 17 and flow out from the outlet of the first end 171 or the second end 172.

In some embodiments, there is a gap between the second extension portion 174 and the main body portion 15, for example, 3. In this way, a through groove with two ends open is formed between the second extension portion 174 and the first extension portion 173. After the condensed water is gathered in the water retaining groove 175, it can flow out through the outlet provided at the first end 171 or the outlet provided at the second end 172, and will not flow to the plug-in place between the cable and the plug-in portion 16.

In some embodiments, the plug-in portion 16 has a first free end 164, and along the width direction W or the length direction L of the detection device, the first free end 164 is away from the main body 15 relative to the second extension portion 174. In other words, the second extension portion 174 is retracted inward toward the main body 15 relative to the first free end 164. In this way, the interference of the second extension portion 174 on the cable during the plugging process between the cable and the plug-in portion 16 can be reduced.

In some embodiments, the second extension portion 174 has a second free end 1741, and along the height direction H of the detection device, the second free end 1741 is away from the plug-in portion 16 relative to the first extension portion 173. The main body 15 includes a side wall, and the side wall has a through hole portion 18, and the through hole portion 18 is arranged through the side wall; along the height direction H of the detection device, the second free end 1741 is close to the plug-in portion 16 relative to the through hole portion 18. In other words, along the height direction H of the detection device, the second free end 1741 is lower than the through hole portion 18, thereby reducing the increase in the height of the detection device caused by the second extension portion 174.

In some embodiments, there is a distance between the blocking portion 17 and the plug-in portion 16 , as shown in FIG. 2 , so as to reduce the interference of the blocking portion 17 on the plug-in connection between the cable and the plug-in portion 16 .

In the related art, the circuit board 3 is fixedly connected to the housing 1. For example, the circuit board 3 is provided with a through hole, and the through hole passes through the circuit board 3. The through hole includes a first through hole and a second through hole, and the housing 1 has a positioning column matched with the first through hole and a positioning hole matched with the second through hole. The positioning column passes through the first through hole of the circuit board 3 to realize the positioning of the circuit board 3 relative to the housing 1. The second through hole is penetrated by a bolt, and the bolt is inserted into the positioning hole so that the bolt is threadedly connected with the positioning hole. The fixed connection between the circuit board 3 and the housing 1 is realized by the cooperation of the positioning column, the positioning hole, the through hole and the bolt. In this scheme, the assembly of the circuit board 3 and the main body 15 is relatively complicated. Moreover, when the detection device needs to replace the circuit board 3 and the detection component 2, the disassembly and assembly steps of the circuit board 3 and the housing 1 are also relatively cumbersome.

To this end, a third aspect of the present application provides a detection device, such as shown in Figures 6 to 10, including a shell 1, the shell 1 having an inner cavity 11 and a circuit board 3, and the circuit board 3 is at least partially located in the inner cavity 11. The shell 1 includes a side wall 150, and the side wall 150 is located on the periphery of the inner cavity 11. The shell 1 includes a buckle portion 5, and the buckle portion 5 is located in the inner cavity 11, and the buckle portion 5 limits the displacement of the circuit board 3 relative to the shell 1. The buckle portion 5 includes a first buckle portion 51, and the first buckle portion 51 includes a main body portion 6 and a convex portion 7, the main body portion 6 is elastic, the main body portion 6 is connected to the side wall 150, and the convex portion 7 protrudes outward from the main body portion 6, The protruding direction of the protrusion 7 intersects with the height direction H of the detection device, and there is a distance between the protrusion 7 and the side wall 150 .

For example, as shown in Figures 9 and 10, the convex portion 7 protrudes outward from the main body 6 along the width direction W of the detection device, the width direction W of the detection device is perpendicular to the height direction H, and the convex portion 7 is close to the middle of the inner cavity 11 relative to the main body 6. In other embodiments, the convex portion 7 protrudes outward from the main body 6 along the length direction L of the detection device or other directions intersecting the height direction H of the detection device.

In the present application, since the protrusion 7 protrudes outward from the main body 6, the protrusion direction of the protrusion 7 intersects with the height direction H of the detection device. When the buckle portion 5 limits the circuit board 3, the buckle portion 5 at least partially has an orthographic projection located on the circuit board 3, and the circuit board 3 is at least partially located between the side wall 150 and the buckle portion 5, so that the buckle portion 5 can cooperate with the side wall 150 to limit the displacement of the circuit board 3. For example, as shown in Figures 9 and 10, the first buckle portion 51 is close to the side wall 150 parallel to the length direction L of the detection device at the periphery of the inner cavity 11, and the main body 6 is substantially parallel to the side wall 150. Along the height direction H of the detection device, the protrusion 7 at least partially has an orthographic projection located on the circuit board 3, and the circuit board 3 is at least partially located between the side wall 150 and the protrusion 7, so that the protrusion 7 can cooperate with the side wall 150 to limit the displacement of the circuit board 3 relative to the housing 1 along the height direction H of the detection device. Along the width direction W of the detection device, the circuit board 3 is at least partially located between the side wall 150 and the main body 6, so that the main body 6 can cooperate with the side wall 150 to limit the displacement of the circuit board 3 along the width direction W of the detection device. Similarly, if the first buckle portion 51 is set to be close to the side wall 150 parallel to the width direction W of the detection device at the periphery of the inner cavity 11, the main body 6 is substantially parallel to the side wall 150, and the first buckle portion 51 can limit the displacement of the circuit board 3 relative to the housing 1 along the height direction H and the length direction L of the detection device.

In the present application, the main body 6 is elastic. For example, as shown in Figures 9 and 10, the main body 6 is an elastic sheet-like component, and the main body 6 protrudes from the side wall 150 to the inner cavity 11. The first buckle portion 51 has a first state and a second state, and the distance of the first buckle portion 51 relative to the middle of the inner cavity 11 in the first state is greater than the distance relative to the middle of the inner cavity 11 in the second state. Specifically, when the first buckle portion 51 is in the first state, the main body 6 is in a deformed state; when the first buckle portion 51 is in the second state, the main body 6 is in a rebound state. After the housing 1 and the circuit board 3 are installed, the main body 6 remains in the rebound state, so that the main body 6 can effectively limit the displacement of the circuit board 3 relative to the housing 1 along the length direction L or the width direction W of the detection device, and the convex portion 7 can effectively limit the displacement of the circuit board 3 relative to the housing 1 along the height direction H of the detection device.

In some embodiments, the body portion 6 is clearance-matched with the circuit board 3, or the body portion 6 is in contact with the circuit board 3. The protrusion 7 is clearance-matched with the circuit board 3, or the protrusion 7 is in contact with the circuit board 3. Both clearance-matching and contact can limit the displacement of the circuit board 3 relative to the housing 1.

In some embodiments, the housing 1 includes a reinforcing rib 8, and the main body 6 and the side wall 150 are both connected to the reinforcing rib 8. Specifically, as shown in FIG11 , the reinforcing rib 8 is connected to the bottom wall 12 and the side wall 150. The reinforcing rib 8 can increase the connection strength of the main body 6 and reduce the risk of the main body 6 breaking during deformation.

In the present application, the shell 1 includes a first snap-fit portion 51, which includes a main body portion 6 and a protrusion 7. The main body portion 6 is elastic, connected to the side wall 150, and the protrusion 7 protrudes outward from the main body portion 6. The protruding direction of the protrusion 7 intersects with the height direction H of the detection device, and there is a spacing between the protrusion 7 and the side wall 150. Therefore, the present application can achieve a fixed connection or a limited connection between the shell 1 and the circuit board 3 through the first snap-fit portion 51, thereby facilitating the installation of the circuit board 3 and the shell 1.

In some embodiments, the side wall 150 includes a bottom wall 12 and a peripheral wall 13 connected to each other along the height direction H of the detection device, and the peripheral wall 13 extends outward from the bottom wall 12. For example, as shown in FIG. 10, the body 6 is connected to the bottom wall 12. The convex portion 7 has a first top 72 and a first bottom 73, and along the height direction H of the detection device, the first top 72 is away from the bottom wall 12 relative to the first bottom 73. The distance that the convex portion 7 protrudes outward from the body 6 gradually increases from the first top 72 to the first bottom 73. The convex portion 7 has a wedge-like structure. The outer surface of the convex portion 7 includes a first inclined surface 71, and the first inclined surface 71 is close to the middle of the inner cavity 11 relative to the body 6. The plane where the first inclined surface 71 is located intersects with the height direction H of the detection device. The greater the distance between the point on the first inclined surface 71 and the bottom wall 12 along the height direction H of the detection device, the farther the distance from the inside of the inner cavity 11 along the length direction L or the width direction W of the detection device. The first inclined surface 71 includes a first point P1 and a second point P2. Along the height direction H of the detection device, the first point P1 is away from the bottom wall 12 relative to the second point P2. Along the length direction or width direction of the detection device, the first point P1 is away from the middle of the inner cavity 11 relative to the second point P2. In the process of assembling the housing 1 and the circuit board 3, it is necessary to press the circuit board 3 down along the height direction H of the detection device until the circuit board 3 is close to the bottom wall 12 relative to the protrusion 7, so as to realize the clamping of the first buckle portion 51 with the circuit board 3. In the process of pressing the circuit board 3 down, the first inclined surface 71 can cooperate with the edge of the circuit board 3, so as to guide the circuit board 3 so that it is easier to clamp it into place with the first buckle portion 51.

In some embodiments, the protrusion 7 has a groove 77, which is formed by being recessed from the first inclined surface 71 toward the inside of the protrusion 7, and the groove 77 has an opening 771, which is located at the first bottom end 73. As shown in FIG. 10 , the convex portion 7 includes a first convex portion 74, a second convex portion 75 and a third convex portion 76. The second convex portion 75 and the third convex portion 76 are both connected to the first convex portion 74. Along the height direction H of the detection device, the second convex portion 75 and the third convex portion 76 are both close to the bottom wall 12 relative to the first convex portion 74. The first convex portion 74 includes a first top end 72; the first bottom end 73 includes the bottom end of the second convex portion 75 and the bottom end of the third convex portion 76. The second convex portion 75 and the third convex portion 76 are symmetrically arranged relative to the axis of the first buckle portion 51. The first convex portion 74, the second convex portion 75 and the third convex portion 76 are all located on the periphery of the groove, and the first convex portion 74, the second convex portion 75 and the third convex portion 76 surround the groove. Along the length direction L of the detection device, the opening is located between the second convex portion 75 and the third convex portion 76. Through the opening 771, it is convenient to check the alignment of the circuit board 3 and the first buckle portion 51.

In some embodiments, the buckle portion 5 includes a second buckle portion 52, and the second buckle portion 52 protrudes from the peripheral wall 13 to the inner cavity 11. For example, as shown in Figures 8 and 11, the second buckle portion 52 is a convex block protruding from the peripheral wall 13 to the inner cavity 11. The second buckle portion 52 has a second top 521 and a second bottom 522. Along the height direction H of the detection device, the second top 521 is away from the second bottom 522 relative to the bottom wall 12, and the distance of the second buckle portion 52 protruding from the peripheral wall 13 to the inner cavity 11 gradually increases from the second top 521 to the second bottom 522. The outer surface of the second buckle portion 52 includes a second inclined surface 523, and the plane where the second inclined surface 523 is located intersects with the height direction H of the detection device. The farther the point on the second inclined surface 523 is from the bottom wall 12, the greater the distance between it and the middle part of the inner cavity 11. The second inclined surface 523 includes a third point P3 and a fourth point P4. Along the height direction H of the detection device, the third point P3 is farther from the bottom wall 12 than the fourth point P4, and the third point P3 is farther from the middle of the inner cavity 11 than the fourth point P4. Similar to the function of the first inclined surface 71, the second inclined surface 523 can also be used to guide the circuit board 3 to better engage with the second buckle portion 52.

In some embodiments, the circuit board 3 and the first bottom end 73 are clearance-fitted, or the circuit board 3 and the first bottom end 73 are abutted; the circuit board 3 and the second bottom end 522 are clearance-fitted, or the circuit board 3 and the second bottom end 522 are abutted.

In some embodiments, along the height direction H of the detection device, the first bottom end 73 is flush with the second bottom end 522. The circuit board 3 is flat, and the first bottom end 73 and the second bottom end 522 are flush, which can better limit the flat circuit board 3 to a horizontal plane nearly perpendicular to the height direction H of the detection device.

In some embodiments, the inner cavity 11 contains a space 111 , the circuit board 3 is at least partially located in the space 111 , and the first buckle portion 51 and the second buckle portion 52 are both located at the periphery of the space 111 . Along the length direction L or the width direction W of the detection device, the first buckle portion 51 and the second buckle portion 52 are respectively located on both sides of the receiving space 111. The first buckle portion 51 cooperates with the second buckle portion 52 to limit the circuit board 3. The circuit board 3 has a first side 33 and a second side 34. Along the width direction W of the detection device, the first side 33 and the second side 34 are respectively located on both sides of the circuit board 3. When the circuit board 3 is assembled with the housing 1, the circuit board is mounted on the first top end 72 of the first buckle portion 51 and the second top end 521 of the second buckle portion 52, and then the circuit board 3 is pressed down. During the pressing process, the first side 33 slides down along the first inclined surface 71, and the second side 34 slides down along the second inclined surface 523. During this process, the main body 6 of the first buckle portion 51 undergoes elastic deformation until the first bottom end 73 and the second bottom end 522 are away from the bottom wall 12 relative to the circuit board 3 along the height direction H of the detection device.

In some embodiments, the housing 1 includes a limiting portion 9, which protrudes from the peripheral wall 13 toward the inner cavity 11, and includes at least one of a first limiting end 91 and a second limiting end 92. The first limiting end 91 and the second limiting end 92 limit the distance between the circuit board 3 and the side wall 150.

Among them, the first limiting end 91 has a first limiting end face 911, and the plane where the first limiting end face 911 is located is parallel to the height direction H of the detection device, as shown in Figure 8. In this way, the first limiting end 91 can limit the distance between the circuit board 3 and the surrounding wall 13. For example, as shown in Figure 7, the surrounding wall 13 includes a second wall 132 and a fourth wall 134 that are relatively arranged along the width direction W of the detection device, and a first wall 131 and a third wall 133 that are relatively arranged along the length direction L of the detection device. The first wall 131, the second wall 132, the third wall 133 and the fourth wall 134 are all provided with a limiting portion 9. For example, the limiting portion 9 arranged on the first wall 131 can limit the distance between the circuit board 3 and the first wall 131. After the circuit board 3 is assembled with the housing 1, the circuit board 3 is connected to the first limiting end 91 of the limiting portion 9 arranged on the first wall 131. The limiting portion 9 can not only be used to limit the distance between the circuit board 3 and the first wall 131, but also can reduce the contact area between the circuit board 3 and the side wall 150, thereby avoiding the circuit board 3 from scratching the first wall 131 during the installation of the circuit board 3 and the housing 1. The limiting portions 9 arranged on the second wall 132, the third wall 133 and the fourth wall 134 have similar functions and are not described in detail here.

The second limiting end 92 has a second limiting end face 921. Along the height direction H of the detection device, the second limiting end face 921 is close to the bottom wall 12 relative to the protrusion 7. There is a gap between the second limiting end face 921 and the bottom end of the protrusion 7. The plane where the second limiting end face 921 is located intersects with the height direction H of the detection device, as shown in FIG8 . In this way, the second limiting end 92 can limit the distance between the circuit board 3 and the bottom wall 12. Specifically, after the circuit board 3 is installed in place. Along the height direction H of the detection device, the circuit board 3 is at least partially away from the bottom wall 12 relative to the second limiting end 92, and the circuit board 3 is A small portion is close to the bottom wall 12 relative to the protrusion 7. When the circuit board 3 and the housing 1 are installed in place, the second limiting end 92 is in clearance fit with the circuit board 3 or the second limiting end 92 abuts against the circuit board 3. In other words, the first bottom end 73 and the second bottom end 522 abut against the first surface 31 of the circuit board 3, and the second limiting end 92 abuts against the second surface 32 of the circuit board 3. The first bottom end 73, the second bottom end 522 and the second limiting end 92 jointly limit the displacement of the circuit board 3 along the height direction H of the detection device.

In some embodiments, along the length direction L or the width direction W of the detection device, the housing 1 includes at least two limiting portions 9 located on the same side of the inner cavity 11, and the first limiting ends 91 of the at least two limiting portions 9 located on the same side of the inner cavity 11 protrude from the peripheral wall 13 toward the inner cavity 11 in the same direction, and the first limiting ends 91 of at least two limiting portions 9 protrude from the peripheral wall 13 toward the inner cavity 11 by the same distance. For example, as shown in FIG. 7 , two or more limiting portions 9 are provided on the first wall 131, the second wall 132, the third wall 133, and the fourth wall 134. The two limiting portions 9 provided on the first wall 131 protrude toward the inner cavity 11 along the length direction L, and the first limiting ends 91 of the two limiting portions 9 protrude outward from the first wall by the same distance.

In some embodiments, the second limiting end surface 921 is perpendicular to the height direction H of the detection device. In some embodiments, the housing 1 includes at least two limiting portions 9, and along the height direction H of the detection device, the distances between the second limiting end surfaces 921 of at least two limiting portions 9 and the bottom wall 12 are equal. The bottom wall 12 is perpendicular to the height direction H of the detection device.

In some embodiments, the limiting portion 9 is fixedly connected to the bottom wall 12. For example, as shown in FIG8 , the limiting portion 9 is fixedly connected to the bottom wall 12, and the limiting portion 9 is fixedly connected to the peripheral wall 13. In this way, the limiting portion 9 can not only be used to limit the displacement of the circuit board 3 relative to the side wall 150, but also play a role in strengthening the housing 1 and reducing the deformation of the housing 1.

The related art sets a waterproof breathable membrane 10 on the gas detection device, for example, as shown in FIG3, the waterproof breathable membrane 10 covers the through hole portion, so that the external gas can enter the inner cavity 11 through the through hole portion, and at the same time, the external water can be blocked outside the detection device. The waterproof breathable membrane 10 can be fixed to the housing 1 by gluing, for example, gluing it to the inner surface of the housing 1. However, as the adhesive ages, the waterproof breathable membrane 10 is easy to fall off from the housing 1. Therefore, a support member 20 can be used to fix the support member 20 to the housing 1 or limit the connection, so that the waterproof breathable membrane 10 is clamped between the support member 20 and the housing 1 to achieve the fixation of the waterproof breathable membrane 10.

In some embodiments, the detection device includes a support member 20 and a waterproof breathable membrane 10, wherein the support member 20 has a perforated portion 201, the perforated portion 201 includes a perforation 2011, and the perforated portion 201 penetrates the support member 20 is provided, the support member 20 is welded to the housing 1, and the waterproof breathable membrane 10 is at least partially clamped between the support member 20 and the housing 1. Along the height direction H of the detection device, the orthographic projection of the through hole portion 18 on the waterproof breathable membrane 10 is located within the outer contour of the waterproof breathable membrane 10, and the orthographic projection of the perforated portion 201 on the waterproof breathable membrane 10 is located within the outer contour of the waterproof breathable membrane 10.

The present application sets a support member 20, which is in the shape of a flat plate and has a perforation 211, which is set through the support member 20; the outer shell 1 has an inner surface 101 and an outer surface 102, and the inner surface 101 of the outer shell 1 is close to the inner cavity 11 relative to the outer surface of the outer shell 1; the support member 20 is welded to the inner surface 101 of the outer shell 1; the waterproof breathable membrane 10 is clamped between the support member 20 and the inner surface of the outer shell 1. In the present application, the welding method of the support member 20 and the outer shell 1 is determined, for example, according to the material of the two. For example, when the support member 20 and the outer shell 1 are both plastic, ultrasonic welding can be used, and when the support member 20 and the outer shell 1 are metal, resistance welding, laser welding and other welding methods can be used. In other embodiments, the support member 20 can also be welded to the outer surface of the outer shell 1.

In some embodiments, the housing 1 has a limiting portion 30, which protrudes outward from the inner surface or the outer surface of the housing 1, as shown in Figures 14 and 15. The support member 20 is at least partially located in the space not formed by the limiting portion 30, and the limiting portion 30 is located at the periphery of the support member 20. The limiting portion 30 defines the portion where the housing 1 is connected to the support member 20.

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 (20)

A detection device comprises a housing, a detection component and a circuit board, wherein the housing comprises a main body and a plug-in portion, the detection component is at least partially located in the main body, the circuit board is at least partially located in the main body, the plug-in portion is used to plug a cable, and the plug-in portion is connected to the main body; The housing comprises a blocking portion, the blocking portion is connected to the main body, and the plug-in portion and the blocking portion are both located outside the main body; A plane perpendicular to the height direction of the detection device is defined as a projection plane. Along the height direction of the detection device, the orthographic projection of the plug-in portion on the projection plane is a first projection, and the orthographic projection of the blocking portion on the projection plane is a second projection. At least part of the second projection coincides with the first projection. The detection device according to claim 1, wherein at least a portion of the second projection is located outside the first projection. The detection device according to claim 2, wherein the blocking portion has a first end and a second end, and along the width direction or the length direction of the detection device, the first end and the second end are respectively located on both sides of the blocking portion, Along the height direction of the detection device, the orthographic projections of the first end and the second end on the projection plane are both located outside the first projection. The detection device according to claim 1, wherein the main body portion comprises a side wall, the side wall is located at the periphery of the circuit board and the detection component, the side wall has a through hole portion, and the through hole portion is arranged through the side wall; Along the height direction of the detection device, the blocking portion is at least partially close to the through hole portion relative to the plug-in portion; There is a distance between the blocking portion and the inserting portion. The detection device according to claim 4, wherein the main body comprises a first main body and a second main body, the first main body is fixedly connected or position-limitedly connected to the second main body, and the first main body and the second main body are both located at the periphery of the circuit board and the detection component; The through hole portion is arranged on the first main body portion, the blocking portion is connected to the first main body portion, and the plug-in portion is connected to the second main body portion. The detection device according to claim 1, wherein the blocking portion comprises a first extending portion and a second extending portion, the first extending portion is connected to the main body portion, and the second extending portion extends from the first extending portion in a direction away from the plug-in portion; The blocking portion has a water retaining groove, which is formed by being recessed inward from the outer surface of the blocking portion, and the first extension portion and the second extension portion are both located at the periphery of the water retaining groove; along the height direction of the detection device, the water retaining groove is away from the plug-in portion relative to the first extension portion; and there is a distance between the second extension portion and the main body portion; The plug-in portion has a first free end, and along the width direction or the length direction of the detection device, the first free end is away from the main body relative to the second extension portion; The second extension portion has a second free end, and along the height direction of the detection device, the second free end is away from the plug-in portion relative to the first extension portion; The main body portion includes a side wall, and the side wall has a through hole portion, and the through hole portion is arranged to penetrate the side wall; along the height direction of the detection device, the second free end is close to the plug-in portion relative to the through hole portion. The detection device according to claim 1, wherein the housing has an inner cavity, the circuit board is at least partially located in the inner cavity, and the housing includes a side wall, and the side wall is located at the periphery of the inner cavity; The housing comprises a buckle portion, the buckle portion is located in the inner cavity, and the buckle portion limits the displacement of the circuit board relative to the housing; The buckle portion includes a first buckle portion, which includes a main body portion and a convex portion, the main body portion is elastic, the main body portion is connected to the side wall, the convex portion protrudes outward from the main body portion, the protruding direction of the convex portion intersects with the height direction of the detection device, and there is a distance between the convex portion and the side wall. The detection device according to claim 7, wherein the side wall comprises a bottom wall and a peripheral wall connected to each other, the peripheral wall extends outward from the bottom wall along the height direction of the detection device, and the body portion is connected to the bottom wall; The convex portion has a first top end and a first bottom end, and along the height direction of the detection device, the first top end is farther away from the bottom wall than the first bottom end; the distance that the convex portion protrudes outward from the main body portion gradually increases from the first top end to the first bottom end; The outer surface of the convex portion includes a first inclined surface, and the plane where the first inclined surface is located is parallel to the detection The first inclined surface intersects with the height direction of the detection device, the first inclined surface includes a first point and a second point, along the height direction of the detection device, the first point is away from the bottom wall relative to the second point, and the first point is away from the middle of the inner cavity relative to the second point. The detection device as described in claim 8, wherein the convex portion has a groove, the groove is formed by being recessed from the first inclined surface to the inside of the convex portion, and the groove has an opening, and the opening is located at the first bottom end. The detection device according to claim 8, wherein the buckle portion includes a second buckle portion, the second buckle portion protrudes from the peripheral wall toward the inner cavity; the inner cavity includes a receiving space, the circuit board is at least partially located in the receiving space, and the first buckle portion and the second buckle portion are both located at the periphery of the receiving space; along the length direction or the width direction of the detection device, the first buckle portion and the second buckle portion are respectively located on both sides of the receiving space; The second buckle portion has a second top end and a second bottom end, and along the height direction of the detection device, the second top end is away from the second bottom end relative to the bottom wall, and the distance that the second buckle portion protrudes from the peripheral wall toward the inner cavity gradually increases from the second top end to the second bottom end; The outer surface of the second buckle portion includes a second inclined surface, and the plane where the second inclined surface is located intersects with the height direction of the detection device; the second inclined surface includes a third point and a fourth point, and along the height direction of the detection device, the third point is farther away from the bottom wall relative to the fourth point, and the third point is farther away from the middle of the inner cavity relative to the fourth point; The snap-on portion includes at least two first snap-on portions, and the snap-on portion includes at least two second snap-on portions; along the length direction or the width direction of the detection device, the at least two first snap-on portions are located on the same side of the receiving space, and the at least two second snap-on portions are located on the same side of the receiving space. The detection device according to claim 8, wherein the housing comprises a limiting portion, the limiting portion protruding from the peripheral wall toward the inner cavity, the limiting portion comprising at least one of a first limiting end and a second limiting end, the first limiting end and the second limiting end both limiting the distance between the circuit board and the side wall; The first limiting end has a first limiting end surface, and the plane where the first limiting end surface is located is parallel to the height direction of the detection device; The second limit end has a second limit end surface along the height direction of the detection device. The second limiting end surface is close to the bottom wall relative to the convex portion, there is a gap between the second limiting end surface and the bottom end of the convex portion, and the plane where the second limiting end surface is located intersects with the height direction of the detection device; along the length direction or width direction of the detection device, the shell includes at least two limiting portions located on the same side of the inner cavity, the first limiting ends of the at least two limiting portions located on the same side of the inner cavity protrude from the peripheral wall to the inner cavity along the same direction, and the first limiting ends of the at least two limiting portions protrude from the peripheral wall to the inner cavity by the same distance; the second limiting end surface is perpendicular to the height direction of the detection device; The housing comprises at least two limiting parts, and along the height direction of the detection device, the distances between the second limiting end faces of the at least two limiting parts and the bottom wall are equal. The detection device according to claim 7, wherein the housing has a through hole portion, and the through hole portion is arranged through a side wall of the housing; The detection device comprises a support member and a waterproof breathable membrane, wherein the support member has a perforated portion, the perforated portion is arranged through the support member, the support member is welded to the housing, and the waterproof breathable membrane is at least partially clamped between the support member and the housing; Along the height direction of the detection device, the orthographic projection of the through hole portion on the waterproof breathable membrane is located within the outer contour of the waterproof breathable membrane, and the orthographic projection of the perforated portion on the waterproof breathable membrane is located within the outer contour of the waterproof breathable membrane. The detection device according to claim 1, wherein the detection device further comprises a connecting terminal, the detection component is connected to the circuit board, the detection component is at least partially located within the housing, and the circuit board is at least partially located within the housing; The housing comprises a bottom wall and a peripheral wall, wherein the bottom wall is connected to the peripheral wall; The connecting terminal has a first connecting portion and a second connecting portion, the first connecting portion is connected to the circuit board, and the second connecting portion is connected to the surrounding wall; the direction perpendicular to the bottom wall is defined as the height direction of the detection device, along the height direction of the detection device, the detection component is away from the bottom wall relative to the circuit board, and the second connecting portion is away from the bottom wall relative to the circuit board. The detection device according to claim 13, wherein along the height direction of the detection device, at least part of the peripheral wall and the bottom wall are respectively located on both sides of the circuit board; the first connecting portion is closer to the bottom wall than the second connecting portion; The detection assembly has a top and a bottom. Along the height direction of the detection device, the top A portion is away from the bottom wall relative to the bottom; Along the height direction of the detection device, the distance between the second connection portion and the bottom wall is H1, the distance between the top and the bottom wall is H2, the distance between the top and the bottom is H3, the thickness of the circuit board is H4, and H2＜H1+H3+H4. The detection device according to claim 14, wherein the connection terminal includes a transition portion, and the first connection portion and the second connection portion are both connected to the transition portion, The connecting terminal includes a first end portion, the first end portion includes the first connecting portion, and the transition portion is connected to the first end portion; Along the height direction of the detection device, at least a portion of the transition portion is far away from the bottom wall relative to the circuit board, and at least a portion of the transition portion is close to the bottom wall relative to the circuit board. The detection device according to claim 15, wherein the housing has an inner cavity, the detection component and the circuit board are both located in the inner cavity, and the first end portion extends from the transition portion to the inner cavity; The first end portion passes through the circuit board, and the first connecting portion is at least partially located inside the circuit board; or, the first connecting portion is connected to the outer surface of the circuit board, and the first connecting portion is close to the bottom wall relative to the circuit board; The detection assembly has a top and a bottom, and along the height direction of the detection device, the top is farther away from the bottom wall than the bottom; The first end has a terminal end, and along the height direction of the detection device, the terminal end is closer to the bottom wall than the top. The detection device according to claim 15, wherein the transition portion comprises a first section and a second section, and along the height direction of the detection device, the first section and the second section are both close to the bottom wall relative to the second connecting portion, and the first section and the second section are both close to the second connecting portion relative to the bottom wall; Along the height direction of the detection device, the first section extends from the second connecting portion to the bottom wall; the second section extends from the first section to the first end, the extension direction of the second section intersects with the height direction of the detection device, and the second section is connected to the first end. The detection device according to claim 15, wherein the housing comprises a protrusion, the protrusion is connected to at least one of the bottom wall and the peripheral wall, and the transition portion is at least partially embedded in the protrusion; or The transition portion is at least partially embedded in at least one of the bottom wall and the peripheral wall. The detection device as described in claim 18, wherein the housing has an inner cavity, the detection component and the circuit board are both located in the inner cavity; and at least a portion of the transition portion is exposed to the inner cavity. The detection device according to claim 15, wherein the connection terminal comprises a second end portion, the second end portion comprises the second connection portion and a protruding portion, the protruding portion protrudes from the second connection portion in a direction away from the circuit board, and the protruding portion has a free end; The second connecting portion is embedded in the peripheral wall, and the second connecting portion is sealed and connected to the peripheral wall; The housing comprises a main body and a plug-in portion, the main body is connected to the plug-in portion, the main body has an inner cavity, the plug-in portion has a receiving cavity, and the protruding portion is at least partially located in the receiving cavity; The plug-in portion includes a wall portion, which is located at the periphery of the cavity. The wall portion has a clamping portion, which is formed by a partial outer surface of the wall portion and is recessed toward the interior of the wall portion. The clamping portion includes a groove portion and a protrusion portion, and the protrusion portion is away from the inner cavity relative to the groove.