A gas detection device

Abstract

The application provides a gas detection device, which can improve the accuracy of the detection result of the gas detection device. The gas detection device provided by the application comprises a sensing assembly, the sensing assembly comprises a first detection unit and a second detection unit; the first detection unit comprises a first shell and a first detection element, the first detection element is located in the first shell, and the first shell has a first through hole part; the second detection unit comprises a second shell and a second detection element, and the second detection element is located in the second shell; the gas detection device comprises a circuit board and a third detection unit, the third detection unit comprises a third detection element, the third detection unit is connected with the circuit board, and compared with the connection position of the third detection unit and the circuit board, the third detection element is closer to the first through hole part.

Description

Technical Field

[0001] This application relates to the field of detection technology, specifically to a gas detection device. Background Technology

[0002] Air conditioning systems use environmentally friendly refrigerants, but these refrigerants are flammable compared to traditional refrigerants, posing certain safety hazards. Therefore, sensors are installed to detect the concentration of the gas to determine if there is a refrigerant leak, so that the control system can shut down and issue an alarm in time, reducing the safety hazards caused by environmentally friendly refrigerants.

[0003] The sensor has two chambers. One chamber contains a thermistor, and an inlet is located at the top of the chamber. When gas enters the chamber through the inlet, the thermal conductivity of the gas changes. Thermal conductivity affects the heat dissipation of the thermistor; if the gas has high thermal conductivity, heat dissipates more easily from the thermistor, causing a change in resistance. This change in resistance is then converted into an electrical signal by a signal conditioning and conversion circuit, thereby measuring the gas concentration. However, the gas itself has a temperature, which affects the detection result of the thermistor. Therefore, the sensor also has a third chamber containing a temperature sensing element to detect the gas temperature. The detected gas temperature is used for compensation calculations to improve the sensor's detection accuracy. However, the accuracy of the sensor after compensation calculations is still not high enough. Summary of the Invention

[0004] The purpose of this application is to provide a gas detection device that can improve the accuracy of the detection results.

[0005] To address the aforementioned technical problems, this application provides a gas detection device, including a sensing assembly. The sensing assembly includes a first detection unit and a second detection unit. The first detection unit includes a first housing and a first detection element, the first detection element being located within the first housing, and the first housing having a first through-hole. The second detection unit includes a second housing and a second detection element, the second detection element being located within the second housing.

[0006] The gas detection device includes a circuit board and a third detection unit. The third detection unit includes a third detection element. The third detection unit is connected to the circuit board. Compared to the connection position between the third detection unit and the circuit board, the third detection element is closer to the first through hole.

[0007] The gas detection device of this application is equipped with a third detection element to detect the temperature of the gas entering the first housing. The temperature of the first detection element can then be compensated based on the detected temperature. In the prior art, a separate gas chamber located far from the thermistor is used to detect the gas temperature. The detected temperature and the temperature sensed by the thermistor may differ significantly, leading to inaccurate compensation calculations and limited improvement in the detection accuracy of the gas detection device. However, the third detection element in this application is located closer to the first through-hole than the connection point between the third detection unit and the circuit board. Compared to the prior art solution where the temperature detection element is located in a third gas chamber and installed on the corresponding circuit board location, the third detection element in this embodiment is closer to the first through-hole, reducing the temperature difference between the gas in contact with the first detection element and the first detection element, thus improving the accuracy of the detection results.

[0008] This application also provides a gas detection device, including a sensing component, the sensing component including a first detection unit and a second detection unit; the first detection unit includes a first housing and a first detection element, the first detection element being located inside the first housing, the first housing having a first through hole; the second detection unit includes a second housing and a second detection element, the second detection element being located inside the second housing;

[0009] The gas detection device further includes a third detection unit, which includes a third detection element. The gas detection device includes a circuit board. The bottom of the first housing is provided with the first through hole. The third detection element is located between the bottom of the first housing and the circuit board.

[0010] The gas detection device places a third detection element between the bottom of the first housing and the circuit board. The bottom of the first housing has a first through hole. The third detection element can be close to the first through hole. Before the gas enters the first through hole, some of the gas will pass through the third detection element first. Since the third detection element is close to the first through hole, the distance between the third detection element and the first detection element is also close. The temperature difference range of the gas that comes into contact with the third detection element and the first detection element is also small. Therefore, the gas temperature detected by the third detection element in this application is used for compensation calculation, which can make the detection results of the gas detection device more accurate. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the gas detection device in one embodiment of this application, viewed from a top view.

[0012] Figure 2 for Figure 1 A schematic diagram of the gas detection device from the AA direction;

[0013] Figure 3 for Figure 1 A schematic diagram of the gas detection device after removing the upper shell.

[0014] Figure 4 for Figure 2 Enlarged diagram of part B in the middle;

[0015] Figure 5 for Figure 3 Enlarged schematic diagram of part C in the middle;

[0016] Figure 6 for Figure 5 A schematic diagram of the first support in the intermediate support structure;

[0017] Figure 7 for Figure 6 Top view of the first support bracket;

[0018] Figure 8 for Figure 7 Right view of the first bracket in the middle;

[0019] Figure 9 This is a schematic diagram of the gas detection device in another embodiment of this application, viewed from a top view.

[0020] Figure 10 for Figure 9 Schematic diagram of the DD section of the gas detection device;

[0021] Figure 11 for Figure 9 A schematic diagram of the gas detection device after removing the upper shell;

[0022] Figure 12 for Figure 10 Enlarged schematic diagram of part E in the middle;

[0023] Figure 13 for Figure 11 Enlarged schematic diagram of part F in the middle;

[0024] Figure 14 for Figure 13 A schematic diagram of the structure of the first support in the middle;

[0025] Figure 15 for Figure 14 A structural schematic diagram of the first support from another angle;

[0026] Figure 16 This is a schematic diagram of the gas detection device in another embodiment of this application, shown from a top view.

[0027] Figure 17 for Figure 16 Schematic diagram of the gas detection device in the GG direction;

[0028] Figure 18 for Figure 16 A schematic diagram of the gas detection device after removing the upper shell;

[0029] Figure 19 for Figure 17 Enlarged schematic diagram of section H in the middle;

[0030] Figure 20 for Figure 18 Enlarged schematic diagram of part I in the middle;

[0031] Figure 21 for Figure 20 Schematic diagram of the second support structure;

[0032] Figure 22 for Figure 21 A schematic diagram of the second support structure from another angle;

[0033] Figure 23 for Figure 20 A schematic diagram of another embodiment of the second support in the middle;

[0034] Figure 24 This is a schematic diagram of the gas detection device in another embodiment of this application, viewed from a top view.

[0035] Figure 25 for Figure 24 Schematic diagram of the gas detection device in the middle section (JJ direction);

[0036] Figure 26 for Figure 25 A schematic diagram of the gas detection device after removing the upper shell;

[0037] Figure 27 for Figure 25 Enlarged schematic diagram of the K-section;

[0038] Figure 28 for Figure 26 Enlarged schematic diagram of the L-shaped section;

[0039] Figure 29 for Figure 28 Schematic diagram of the second support structure;

[0040] Figure 30 for Figure 29 A schematic diagram of the second support structure from another angle;

[0041] Figure 31 for Figure 28 A schematic diagram of another embodiment of the second support in the middle.

[0042] Figure 32 This is a schematic diagram of the gas detection device in another embodiment of this application;

[0043] Figure 33 for Figure 32 Enlarged view of the M-shaped area.

[0044] The annotations in the attached figures are explained as follows:

[0045] 10 - Circuit board; 10a - Connecting hole;

[0046] 20 - Sensing components;

[0047] 21-First detection unit; 211-First housing; 2111-First cover; 2111a-First limiting part; 2112-First base; 212-First electrical connector; 213-First detection element; 211a-First through hole; 211b-Second through hole;

[0048] 22-Second detection unit; 221-Second housing; 2211-Second cover; 2211a-Second limiting part; 2212-Second base; 222-Second electrical connector; 223-Second detection element;

[0049] 23-Support structure;

[0050] 231-First bracket; 2311-Positioning support; 2312-Mounting bracket; 2312a-Receiving groove; 23121-Upright column; 23122-Horizontal column; 2313-First frame body; 23131-Limiting surface; 2313a-Limiting hole;

[0051] 232-Second bracket; 2322-Mounting bracket; 23221-Column; 23222-Horizontal column; 2322a-Receiving groove; 2323-Second frame section; 23231-Step surface; 23232-Step sidewall; 2323a-Window; 23233-Support column;

[0052] 24-Third detection unit; 241-Third detection element; 242-Third electrical connector;

[0053] 30 - Outer shell; 301 - Upper shell; 302 - Lower shell; 30a - Vent structure. Detailed Implementation

[0054] To enable those skilled in the art to better understand the technical solutions of this application, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments. In the embodiments of this application, the terms "first" and "second" are used only to distinguish the same or similar structural features, and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features.

[0055] Please refer to Figures 1 to 3 , Figure 1This is a schematic diagram of the gas detection device in one embodiment of this application, viewed from a top view. Figure 2 for Figure 1 A schematic diagram of the gas detection device from the AA direction; Figure 3 for Figure 1 A schematic diagram of the gas detection device after removing the upper shell 301.

[0056] This embodiment provides a gas detection device, which includes a housing 30 and a circuit board 10 and a sensing component 20 located inside the housing 30. The sensing component 20 and the circuit board 10 are electrically connected so that the signal detected by the sensing component 20 can be converted and transmitted to the outside. Figure 3 The diagram illustrates the circuit board 10, the sensing component 20 mounted on the circuit board 10, and various other electrical components such as capacitors and control modules. The housing 30 covers the circuit board 10, the sensing component 20, and the other electrical components, providing protection. Figure 2 The schematic diagram of the outer casing 30 specifically includes an upper casing 301 and a lower casing 302, which are connected together. In this embodiment, the gas detection device is used for gas detection. The outer casing 30 has a vent structure 30a to allow gas to enter the interior of the gas detection device, where it can be detected by the sensing component 20. This gas detection device, for example, is used to detect the refrigerant in an air conditioning system. The gas detection device can be installed outdoors, near the outdoor unit of the air conditioning system. If refrigerant leaks into the air outside the outdoor unit, the air mixed with refrigerant can be detected by the gas detection device.

[0057] like Figure 2 As shown, the sensing component 20 includes a first detection unit 21 and a second detection unit 22. The first detection unit 21 includes a first housing 211 and a first detection element 213. The first detection element 213 is located inside the first housing 211 and is used to detect gas. The first detection element 213 is, for example, a thermistor, or more specifically, a thermistor. When gas enters the first housing 211, its thermal conductivity will affect the heat dissipation of the thermistor. If the thermal conductivity of the gas is high, the heat will be more easily dissipated from the thermistor, resulting in a decrease in the resistance of the thermistor. In this embodiment, the first housing 211 specifically includes a first cover 2111 and a first base 2112. The first cover 2111 has an opening at the bottom, and the first base 2112 seals the opening of the first cover 2111. The first detection unit 21 also includes a first electrical connector 212, which is used to establish a connection between the first detection element 213 and the circuit board 10. The first electrical connector 212 can be a pin, and the first electrical connector 212 can pass through the first base 2112 and connect to the circuit board 10.

[0058] The second detection unit 22 includes a second housing 221 and a second detection element 223. The second detection element 223 is located inside the second housing 221 and can also be a thermistor. In this embodiment, the second housing 221 specifically includes a second cover 2211 and a second base 2212. The second cover 2211 has a bottom opening, and the second base 2212 seals the opening. The second detection unit 22 also includes a second electrical connector 222, which is used to establish a connection between the second detection element 223 and the circuit board 10. The second electrical connector 222 can also be a pin, and it can pass through the second base 2212 and connect to the circuit board 10. In this embodiment, the first housing 211 and the second housing 212 are separate components; however, they could also be an integrated structure.

[0059] Based on the Wheatstone bridge principle, under the combined action of the first detection element 213 and the second detection element 223, the change in resistance caused by the gas to be detected can be converted into an electrical signal through a signal conditioning and conversion circuit, thereby realizing the measurement of gas concentration. The gas detection device is, for example, a MEMS (Micro Electromechanical System) sensor. The principle of gas concentration detection by the sensing component 20 is known technology and will not be discussed further.

[0060] As can be seen from the above description, during the detection, the gas to be detected needs to enter the first housing 211, so it can communicate with the outside, while the second housing 221 is not connected to the outside, and the inner cavity of the second housing 221 is a closed cavity.

[0061] like Figure 4 and Figure 5 As shown, Figure 4 for Figure 2 Enlarged diagram of part B in the middle; Figure 5 for Figure 3 Enlarged diagram of part C in the middle.

[0062] In this embodiment, the first housing 211 has a first through hole 211a. The gas to be detected can first enter the interior of the outer casing 30 through the vent structure 30a, and then enter the first housing 211 of the first detection unit 21 through the first through hole 211a, and contact the first detection element 213 for detection. This application defines that in the normal operating state of the gas detection device, the circuit board 10 is located below, and the sensing component 20 is located above the circuit board 10, thus defining the vertical direction. Figure 2 As shown, the up and down direction is also the vertical direction. Figure 4 The first through hole 211a is provided on the top of the first housing 211.

[0063] It should be emphasized that the gas detection device in this embodiment also includes a support structure 23 and a third detection unit 24. The third detection unit 24 includes a third detection element 241, which is mounted on the support structure 23. The support structure 23 is at least limited by the first housing 211. The second housing 221 and the first housing 211 are generally arranged side by side on the circuit board 10. The first through hole 211a of the first housing 211 is located on the top of the first housing 211 (or on the side wall in other embodiments described below). In this embodiment, the third detection element 241 is arranged as close as possible to the first through hole 211a, that is, adjacent to the first through hole 211a. Figure 4 In the middle, the third detection element 241 is located above the first through hole portion 211a.

[0064] Based on the principles of the background technology, the gas itself has a temperature, which may affect the detection result of the first detection element 213. In this embodiment, a third detection element 241 is provided to detect the temperature of the gas entering the first housing 211, so that the temperature compensation calculation of the first detection element 213 can be performed based on the detected temperature. Before entering the first through-hole 211a, some of the gas passes through the third detection element 241. Since the third detection element 241 is mounted on the support structure 23, and the support structure 23 is at least limited to the first housing 211, the third detection element 241 is relatively close to the first through-hole 211a. Thus, the distance between the third detection element 241 and the first detection element 213 is also relatively close, and the temperature difference range of the gas that comes into contact with the third detection element 241 and the first detection element 213 is relatively small. In contrast, in the prior art, a separate gas chamber far away from the thermistor is used to detect the temperature of the gas itself, and the detected temperature and the temperature sensed by the thermistor may have a large temperature difference. Therefore, in this embodiment, the gas temperature detected by the third detection element 241 is used for compensation calculation, which can make the detection results of the gas detection device more accurate.

[0065] Based on the above analysis, it can be seen that when setting the third detection element 241 in this embodiment, the third detection element 241 needs to be set as close as possible to the first through hole portion 211a, that is, the third detection element 241 should be as close as possible to the first detection element 213. For example, the third detection element 241 can be set directly opposite the first through hole portion 211a, or although the third detection element 241 is not set directly opposite the first through hole portion 211a, it can be set towards the edge of the hole wall of the first housing 211 corresponding to the first through hole portion 211a.

[0066] For example, when the third detection element 241 is disposed near the first through hole 211a, it can be defined such that at least a portion of the projection of the third detection element 241 along the axial direction of the first through hole 211a coincides with at least a portion of the projection of the first through hole 211a. That is, when at least a portion of the third detection element 241 is disposed toward the first through hole 211a, and when the third detection element 241 is directly opposite the first through hole 211a, the projections completely coincide. Of course, this limitation of the relationship after projection is based on the premise that no other components are disposed between the third detection element 241 and the first through hole 211a.

[0067] As described above, in this embodiment, a bracket structure 23 is provided to install the third detection element 241. In order to make the third detection element 241 as close as possible to the first through hole 211a, in this embodiment, the bracket structure 23 is at least limited to the first housing 211. In this way, the bracket structure 23 is relatively close to the first housing 211, and the third detection element 241 on it is naturally easy to get close to the first through hole 211a.

[0068] You can continue to refer to this. Figure 4 and Figure 5 and combined Figures 6 to 8 understand, Figure 6 for Figure 5 A schematic diagram of the structure of the first support 231 in the middle support structure 23; Figure 7 for Figure 6 Top view of the first support 231 in the middle; Figure 8 for Figure 7 Right view of the first support 231.

[0069] In this embodiment, the support structure 23 includes a first support 231, which includes a first frame portion 2313. The first housing 211 and the second housing 221 have limiting portions, respectively. Figure 4 The diagram illustrates a first limiting part 2111a and a second limiting part 2211a. At least a portion of the first limiting part 2111a is located between the second frame part 2323 and the first frame part 2313, and at least a portion of the second limiting part 2211a is also located between the second frame part 2323 and the first frame part 2313. Since the first frame part 2313 and the circuit board 10 are located on different sides of the limiting part, the first frame part 2313 can press against the limiting part in the direction close to the circuit board 10. Specifically, since the circuit board 10 is located below the first housing 211 and the second housing 221, the first frame part 2313 is located above the first housing 211 and the second housing 221, thereby pressing the first housing 211 and the second housing 221 downwards to position the first detection unit 21 and the second detection unit 22 onto the circuit board 10.

[0070] In detail, such as Figure 6As shown, the first frame portion 2313 is a plate-like structure. The first frame portion 2313 has two limiting holes 2313a. The first frame portion 2313 is fitted onto the outside of the first housing 211 and the second housing 221, such that a portion of the first housing 211 is located in one limiting hole 2313a, and a portion of the second housing 221 is located in the other limiting hole 2313a. Thus, both detection units are simultaneously fitted onto the first frame portion 2313. Now let's look at... Figure 4 Both the first cover 2111 of the first housing 211 and the second cover 2211 of the second housing 221 have flanges at their bottoms. These flanges serve as the first limiting part 2111a and the second limiting part 2211a, respectively. Thus, the first frame part 2313 can directly press against the flanges to limit the first housing 211 and the second housing 221, ensuring reliable positioning. It is understood that the limiting part is not limited to a flange structure; any protrusion extending perpendicular to the vertical direction on either the first housing 211 or the second housing 221 can serve as a limiting part.

[0071] At this time, the first bracket 231 includes a mounting bracket for mounting the third detection element 241, defined as mounting bracket 2312. The mounting bracket 2312 is connected to the first frame portion 2313 or is integrally formed with the first frame portion 2313, and the mounting bracket 2312 is located above the first frame portion 2313. As mentioned above, the first frame portion 2313 is used to press down and limit the first housing 211 and the second housing 221. The first limiting portion 2111a and the second limiting portion 2211a are located at the bottom of the corresponding housings. Therefore, the height of the first frame portion 2313 is still a certain distance from the first through hole portion 211a in the vertical direction. At this time, a mounting bracket 2313 is specially set above the first frame portion 2313 to facilitate raising the third detection element 241 so that it can better approach the first through hole portion 211a. Therefore, the first bracket 231 in this embodiment can not only limit the first housing 211 and the second housing 221, but also be used to install the third detection element 241, so that the third detection element 241 is relatively close to the first through hole 211a of the first housing 211.

[0072] In this embodiment, the mounting bracket 2312 is mainly a columnar structure, including a vertical column 23121 and a horizontal column 23122. The vertical column 23121 extends vertically, and the horizontal column 23122 extends laterally perpendicular to the vertical direction. The lower end of the vertical column 23121 is separately connected to the first frame part 2313 or integrally formed with the first frame part 2313. The upper end of the vertical column 23121 is connected to the horizontal column 23122. The horizontal column 23122 and the vertical column 23121 can be separately or integrally formed. When integrally formed, the horizontal column 23122 can be formed by bending the end of the columnar structure. Figure 4As shown, the column 23121 extends vertically and is located on the side of the first housing 211. Part of the side wall of the column 23121 is arranged opposite to the side wall of the first housing 211. The column 23121 is still a certain distance away from the first through hole 211a at the top of the first housing 211. The horizontal column 23122 extends above the top of the first housing 211. The horizontal column 23122 is arranged opposite to the top of the first housing 211. Then the third detection unit 24 can be installed on the mounting bracket 2312 and its third detection element 241 extends out of the horizontal column 23122 and is located above the first through hole 211a. By controlling the height of the mounting bracket 2312, the distance between the third detection element 241 and the first through hole 211a in the vertical direction can be controlled, and this distance can be minimized.

[0073] Furthermore, in this embodiment, the mounting bracket 2312 may be provided with a receiving groove, which can be defined as receiving groove 2312a, from... Figure 6 As can be seen, the receiving groove 2312a extends from the upright 23121 to the horizontal column 23122, and penetrates both the upright 23121 and the horizontal column 23122 along the extending direction. In addition to the aforementioned third detection element 241, the third detection unit 24 also includes a third electrical connector 242 adapted to the third detection element 241. The third electrical connector 242 is, for example, a wire harness. At least a portion of the third electrical connector 242 can be accommodated in the receiving groove 2312a. For example, the wire harness can be embedded in the receiving groove 2312a to constrain the wire harness. The third detection element 241 and the third electrical connector 242 are connected, and the third electrical connector 242 is connected to the circuit board 10. The third detection element 241 is not located in the receiving groove 2312a; at least a portion of the third detection element 241 extends out of the mounting bracket 2312 to ensure sufficient contact with the gas. The receiving groove 2312a penetrating the horizontal column 23122 facilitates the extension of the third detection element 241 out of the horizontal column 23122.

[0074] Figure 6 As can be seen, the first frame 2313 and the column 23121 are integrated, and the receiving groove 2312a extends downwards. In this way, the third electrical connector 242 can pass downwards through the first frame 2313 to connect with the circuit board 10 below.

[0075] In addition, such as Figure 6As shown, the first frame portion 2313 is also provided with a limiting surface 23131. The limiting surface 23131 is a part of the hole wall corresponding to the limiting hole 2313a. The limiting hole 2313a and the first housing 211 and the second housing 221 are not completely matched in shape. Except for the limiting surface 23131, the remaining hole wall of the limiting hole 2313a has a gap with the outer surface of the corresponding first housing 211 or second housing 221. Only the limiting surface 23131 of the first frame portion 2313 contacts the outer surface of the side wall of the first housing 211 and the second housing 221, so as to mutually limit the first housing 211 and the second housing 221 while satisfying the premise of convenient assembly. In this embodiment, the first housing 211 and the second housing 221 are cylindrical housings, and the limiting surface 23131 is correspondingly set as an arc-shaped surface.

[0076] In addition, the first bracket 231 may also include a positioning pillar 2311 located at the bottom of the first frame portion 2313. The positioning pillar 2311 is connected to the circuit board 10, so the first bracket 231 can position the first housing 211 and the second housing 221 onto the circuit board 10. Figure 6 The first support 231 is equipped with two positioning supports 2311. The first frame part 2313 is roughly rectangular in shape. The two positioning supports 2311 are positioned at two diagonally opposite positions on the first frame part 2311, thus achieving relatively stable positioning. Of course, more positioning supports 2311 can also be used. The connection method between the positioning supports 2311 and the circuit board 10 is not limited, such as... Figure 5 As shown, a connection hole 10a can be provided on the circuit board 10, and the positioning support 2311 can be set as a snap-fit ​​structure to snap into the connection hole 10a. The positioning support 2311 and the circuit board 10 can also be detachably connected by fasteners or other means, etc., which will not be listed one by one.

[0077] In this embodiment, since the first housing 211 and the second housing 221 are arranged adjacent to each other, the mounting bracket 2312 can be arranged away from the second housing 221 to facilitate the arrangement of the mounting bracket 2312 and reduce interference. The first housing 211 and the second housing 221 can be defined to be distributed along a first direction, so as to... Figure 2 Assuming a viewing angle, specifically the left-right direction, at least a portion of the mounting bracket 2312 can be positioned on the side of the first housing 211 away from the second housing 221 in the first direction. Figure 2In this embodiment, the second housing 221 is located to the left of the first housing 211, and the mounting bracket 2312 is located to the right of the first housing 211. In this embodiment, the first housing 211 is a cylindrical housing. The columns 23121 of the second housing 221 and the mounting bracket 2312 are distributed on different sides of the first housing 211 radially, while the horizontal column 23122 extends above the first through-hole 211a to bring the third detection element 241 close to the first through-hole 211a. However, it is understood that the mounting bracket 2312 can also be located in other positions on the first housing 211, but this is not the case. Figure 2 From a certain perspective, the mounting bracket 2312 can also be located on the side of the first housing 211 perpendicular to the plane of the paper. That is, in this embodiment, the first frame part 2313 is rectangular, and the mounting bracket 2312 is located on the short side of the long direction, or on the long side of the rectangle. More specifically, it is located on the long side corresponding to the position of the limiting hole 2313a on which the first housing 211 is fitted.

[0078] You can continue to refer to this. Figures 9 to 13 understand, Figure 9 This is a schematic diagram of the gas detection device in another embodiment of this application, viewed from a top view. Figure 10 for Figure 9 Schematic diagram of the DD section of the gas detection device; Figure 11 for Figure 9 A schematic diagram of the gas detection device after removing the upper shell 301; Figure 12 for Figure 10 Enlarged schematic diagram of part E in the middle; Figure 13 for Figure 11 Enlarged schematic diagram of part F in the middle.

[0079] The gas detection device in this embodiment has a basically the same structure as the gas detection device in the above embodiment, except that... Figures 9 to 13 In this embodiment, the first through-hole portion 211a of the first housing 211 is not located on the top of the first housing 211, but rather on the side wall portion of the first housing 211, specifically on the side wall portion of the first cover 2111. Similarly, since the first housing 211 and the second housing 221 are adjacent to each other, to facilitate the arrangement of the mounting bracket 2312 and ensure smooth gas flow, the first through-hole portion 211a located on the side wall portion is positioned away from the second housing 221. The first through-hole portion 211a can be located on the side of the first housing 211 that is away from the second housing 221 in a first direction. Figure 2In this embodiment, the first through-hole portion 211a is located on the left side of the first housing 211, the second housing 221 is located on the right side of the first housing 211, and the third detection element 241 is located at the position of the first through-hole portion 211a, which is also located on the opposite side of the second housing 211. Specifically, in this embodiment, the first housing 211 is a cylindrical housing, and the second housing 221 and the third detection element 241 are distributed on different sides of the first housing 211 along the radial direction.

[0080] In this embodiment, unlike the previous scheme where the first through-hole 211a was located on the top of the first housing 211, the structure of the first bracket 231 has been adjusted. Please refer to [link / reference needed]. Figures 14 to 15 understand, Figure 14 for Figure 13 Schematic diagram of the structure of the first support 231; Figure 15 for Figure 14 A structural schematic diagram of the first support 231 from another angle.

[0081] At this point, the mounting bracket 2312 only needs to accommodate the first through-hole 211a of the third detection element 241 mounted on it near the side wall of the first housing 211. Therefore, the mounting bracket 2312 does not need to include the horizontal column 23122 as in the above embodiment, and can only include the vertical column 23121. The vertical dimension of the vertical column 23121 can also be relatively small, reaching the position of the first through-hole 211a. Similarly, the vertical column 23121 is also provided with a receiving groove 2312a to accommodate at least part of the third electrical connector 242 of the third detection unit 24. The other structures and working principles of this embodiment are the same as those of the above embodiments and will not be repeated.

[0082] In addition, a second through hole 211b may be provided at the bottom of the first housing 211 (on the side facing the circuit board 10) in various embodiments of this application, and the second through hole 211b is specifically provided on the first base 2112. In this way, the first through hole 211a and the second through hole 211b can form convection, which facilitates more and faster gas to enter the first housing 211, so that the first detection element 213 can detect the gas in a timely manner.

[0083] When setting the second through hole 211b, you can continue to refer to... Figures 16 to 20 understand, Figure 16 This is a schematic diagram of the gas detection device in another embodiment of this application, shown from a top view. Figure 17 for Figure 16 Schematic diagram of the gas detection device in the GG direction; Figure 18 for Figure 16 A schematic diagram of the gas detection device after removing the upper shell 301; Figure 19 for Figure 17 Enlarged schematic diagram of section H in the middle; Figure 20 for Figure 18 Enlarged schematic diagram of part I in the middle.

[0084] This embodiment and Figure 1 The structure of the gas detection device in the Chinese embodiment is basically the same, and it also includes a first bracket 231. The first bracket 231 includes a first frame part 2313 for cooperating with the first limiting part 2111a of the first housing 211 and the second limiting part 2211a of the second housing 221 to achieve limiting. The first bracket 231 also includes a positioning support 2311 for connecting to the circuit board 10.

[0085] The difference is that, Figures 16 to 20 In the embodiment, the first bracket 231 does not have a mounting bracket 2312. In addition to the first bracket 231, the bracket structure 23 also includes a second bracket 232. The mounting bracket for mounting the third detection element 241 is specifically set on the second bracket 232 and is defined as mounting bracket 2322.

[0086] Please combine Figures 21 to 23 understand, Figure 21 for Figure 20 Schematic diagram of the structure of the second support 232; Figure 22 for Figure 21 A structural schematic diagram of the second support 232 from another angle; Figure 23 for Figure 20 A schematic diagram of another embodiment of the second support 232.

[0087] The second support 232 includes a second frame portion 2323, which is located below the first housing 211 and the second housing 221, and supports the first housing 211 and the second housing 221. The second frame portion 2323 is supported on the circuit board 10. That is, the second frame portion 2323 is located between the first housing 211, the second housing 221 and the circuit board 10, and the first housing 211 and the second housing 221 are located between the first frame portion 2323 and the second frame portion 2323. On the one hand, the first housing 211 and the second housing 221 are limited, and on the other hand, the first housing 211 and the second housing 221 can be raised to a certain height, so that the bottom of the first housing 211 and the second housing 221 and the circuit board 10 maintain a certain distance. At this time, the side of the second frame portion 2323 also has a window 2323a. As mentioned above, the bottom of the first housing 211 is provided with a second through hole 211b. After the second frame part 2323 lifts the first housing 211, it facilitates the flow of gas at the second through hole 211b, so as to form convection with the first through hole 211a.

[0088] Obviously, window 2323a should remain connected to the second through hole 211b. To achieve this, in this embodiment, the second frame portion 2323 is generally annular in structure. The second frame portion 2323 supports the first housing 211 and the second housing 221, and the annular hollow portion of the second frame portion 2323 serves to connect window 2323a and the second through hole 211b. Of course, the second frame portion 2323 is not limited to this. Figures 21 to 22 The structural form is not limited to setting the second frame part 2323 as a ring structure, as long as it can conduct the window 2323a and the second through hole part 211b.

[0089] For example, in this embodiment, the second frame portion 2323 includes an annular support body and a plurality of support columns 23233 disposed at the bottom of the annular support body, with windows 2323a formed between adjacent support columns 23233. The support columns 23233 can directly abut against the circuit board 10. This method of forming windows 2323a results in a larger area of ​​windows 2323a, allowing for smoother gas flow. Obviously, under the premise of ensuring strength and reliability, the support columns 23233 can be set to be as thin as possible to ensure that gas can flow through the windows 2323a more promptly.

[0090] like Figure 21 As shown, the upper end face of the annular support body of the second frame part 2323 has a stepped sidewall 23232 and a stepped surface 23231 located inside the stepped sidewall 23232. The stepped sidewall 23232 extends upward, and the stepped surface 23231 also faces upward. Both the stepped sidewall 23232 and the stepped surface 23231 are annular, with the direction closer to the center of the annulus being inward and the opposite being outward. The first shell 211 and the second shell 221 are supported by the stepped surface 23231. The stepped sidewall 23232 can also limit the first shell 211 and the second shell 221, confining them to the inside of the stepped sidewall 23232, making the support connection of the first shell 211 and the second shell 221 more reliable.

[0091] At this time, the mounting bracket is connected to the second frame part 2323 and can be defined as the mounting bracket 2322. The mounting bracket 2322 is located above the second frame part 2323. The specific structural form of the mounting bracket 2322 is basically the same as that of the mounting bracket 2312 set on the first bracket 231. It also includes a column 23211 and a horizontal column 23222. The mounting bracket 2322 is provided with a receiving groove 2322a for accommodating the third electrical connector 242 of the third detection unit 24. The specific details will not be repeated.

[0092] Figure 21The size of the groove of the second receiving groove 2322a of the second bracket 232 is not less than the cross-sectional size of the third electrical connector 242, so that the third electrical connector 242 can be easily embedded into the second receiving groove 2322a; Figure 23 The size of the groove 2322a is smaller than the cross-sectional size of the third electrical connector 242. Thus, the third electrical connector 242 needs to be squeezed and embedded into the second receiving groove 2322a, but the limiting effect on the third electrical connector 242 is better.

[0093] Please continue to refer to this. Figures 24 to 28 understand, Figure 24 This is a schematic diagram of the gas detection device in another embodiment of this application, viewed from a top view. Figure 25 for Figure 24 Schematic diagram of the gas detection device in the middle section (JJ direction); Figure 26 for Figure 25 A schematic diagram of the gas detection device after removing the upper shell 301; Figure 27 for Figure 25 Enlarged schematic diagram of the K-section; Figure 28 for Figure 26 Enlarged schematic diagram of the L-shaped section; Figure 29 for Figure 28 Schematic diagram of the structure of the second support 232; Figure 30 for Figure 29 A structural schematic diagram of the second support 232 from another angle; Figure 31 for Figure 28 A schematic diagram of another embodiment of the second support 232.

[0094] The gas detection device in this embodiment and Figure 18 The structure of the gas detection device is basically the same, except that in this embodiment, the first through hole 211a is located on the side wall of the first housing 211, so the mounting bracket 2322 only includes the upright column 23211 and does not include the horizontal column 23222. Similarly, Figure 29 The size of the groove of the second receiving groove 2322a of the second bracket 232 is not less than the cross-sectional size of the third electrical connector 242, so that the third electrical connector 242 can be easily embedded into the second receiving groove 2322a; Figure 31 The size of the groove 2322a is smaller than the cross-sectional size of the third electrical connector 242. Thus, the third electrical connector 242 needs to be squeezed and embedded into the second receiving groove 2322a, but the limiting effect on the third electrical connector 242 is better.

[0095] In the above embodiments, in order to allow the third detection element 241 to be positioned close to the first through hole 211a, a bracket structure 23 is provided and limited by the first housing 211, and the third detection element 241 is mounted on the bracket structure 23. Under the premise of simplifying the installation structure of the third detection unit 24, the third detection element 241 can be positioned close to the first through hole 211a.

[0096] Obviously, the third detection element 241 in this embodiment is not limited to being disposed on the bracket structure 23. In fact, as long as the third detection element 241 is relatively close to the first through hole 211a, it is acceptable. It can be seen that compared to the connection position between the third detection unit 24 and the circuit board 10 (specifically, the connection position between the third electrical connector 242 and the circuit board 10 in this embodiment), the third detection element 241 can be set closer to the first through hole 211a. In this way, compared to the scheme in the prior art where the temperature detection element is located in the third air chamber and installed at the circuit board position corresponding to the air chamber, the third detection element 242 can be closer to the first through hole 211a to improve the accuracy of the detection results.

[0097] To accommodate the connection position between the third electrical connector 242 and the circuit board 10, the third detection element 241 is positioned closer to the first through hole 211a. Besides mounting the third detection element 241 on the support structure 23 in the above embodiment, it can also be positioned below the first housing 211, such as... Figure 32 and Figure 33 As shown, Figure 32 This is a schematic diagram of the gas detection device in another embodiment of this application; Figure 33 for Figure 32 Enlarged view of the M-shaped area.

[0098] In this embodiment, the first housing 211 has a first through-hole 211a at its bottom, and the third detection unit 24 is located below the first housing 211. The third detection unit 24 includes a third detection element 241, which is located between the bottom of the first housing 211 and the circuit board 10. In this case, the third detection unit 24 can be directly mounted on the circuit board 10. For example, the third detection element 241 can be a sensing chip that can be directly soldered onto the circuit board 10. The third detection unit 24 can also include a third electrical connector 242, which can be connected to the circuit board 10. In this case, the third detection element 241 has the same structure as the third detection element 241 in the above embodiment, and both can be probes used to directly contact gas to detect gas temperature.

[0099] In addition, a second bracket 232 is also provided in this embodiment to lift the first housing 211 and the second housing 221. Of course, the first bracket 231 can also be provided simultaneously. The structure of the bracket structure 23 is basically the same as that in the above embodiment, except that it is not necessary to provide a mounting bracket 2312 on the first bracket 231 and not necessary to directly provide a mounting bracket 2322 on the second bracket 232. It can be understood that in order to bring the third detection element 241 closer to the first through hole 211a, a bracket structure extending in a direction perpendicular to the circuit board 10 can also be provided. The bracket structure and the circuit board 10 are positioned to limit each other, and the third detection element 241 can be installed on the bracket structure, thereby bringing it closer to the first through hole 211a. In this embodiment, a second through hole that establishes convection with the bottom first through hole 211a can also be provided. The second through hole is provided at the top or side wall of the first housing 211.

[0100] It should be noted that the third detection element 241 detects the gas primarily to compensate for the temperature difference of the gas contacted by the first detection element 213. However, the second detection element 223, as a component that cooperates with and compares with the first detection element 213, is still affected by the ambient temperature even though it is located in a sealed chamber. Therefore, the third detection element 241 can actually be relatively close to the first through hole 211a to be close to the first detection element 213, while also being relatively close to the second detection element 223. For example, the first through hole 211a can be located on the part of the first housing 211 facing the second housing 221, and the third detection element 241 can be located, for example, between the first housing 211 and the second housing 221. Of course, since the first housing 211 and the second housing 221 are relatively close, the arrangement space for the third detection element 241 is relatively limited. According to the aforementioned embodiment, the third detection element 241 can be arranged on the top or side of the first housing 211 through the support structure 23, or directly on the bottom of the first housing 211, which provides more arrangement space.

[0101] Furthermore, in the above embodiments, the third detection element 241 is located outside the first housing 211. Therefore, it is feasible to have at least a portion of the third detection element 241 extend into the first through-hole portion 211a, or to extend further so that at least a portion is directly located inside the first housing 211. Extending inside would bring it closer to the first detection element 213, but placing it externally facilitates the assembly of the third detection element 241.

[0102] The above are merely preferred embodiments of this application. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A gas detection device, characterized in that, The system includes a sensing assembly (20), which includes a first detection unit (21) and a second detection unit (22). The first detection unit (21) includes a first housing (211) and a first detection element (213), the first detection element (213) being located within the first housing (211), and the first housing (211) having a first through hole (211a). The second detection unit (22) includes a second housing (221) and a second detection element (223), the second detection element (223) being located within the second housing (221). The gas detection device includes a circuit board (10) and a third detection unit (24). The third detection unit (24) includes a third detection element (241). The third detection unit (24) is connected to the circuit board (10). Compared to the connection position of the third detection unit (24) and the circuit board (10), the third detection element (241) is closer to the first through hole (211a).

2. The gas detection device according to claim 1, characterized in that, The gas detection device further includes a support structure (23), at least a portion of the third detection unit (24) is limited within the support structure (23), and the support structure (23) is at least limited to the first housing (211).

3. The gas detection device according to claim 2, characterized in that, The bracket structure (23) includes mounting brackets (2312, 2322), which have receiving slots (2312a, 2322a). The third detection unit (24) also includes a third electrical connector (242), and the third detection element (241) is connected to the circuit board (10) through the third electrical connector (242). At least a portion of the third electrical connector (242) is located within the receiving groove (2312a, 2322a), and at least a portion of the third detection element (241) extends out of the mounting bracket (2312, 2322).

4. The gas detection device according to claim 3, characterized in that, The first through hole (211a) is located at the top of the first housing (211). The mounting bracket (2312, 2322) includes vertically extending columns (23121, 23221) and horizontal columns (23122, 23222) located at the upper end of the columns (23121, 23221). The portion of the horizontal column (23122, 23222) is disposed opposite to the top of the first housing (211). The third detection element (241) extends out of the horizontal column (23122, 23222). Alternatively, the first through hole (211a) is located on the side wall of the first housing (211), and the mounting bracket (2312, 2322) includes vertically extending columns (23121, 23221), with a portion of the side wall of the column (23121, 23221) and the side wall of the first housing (211) being disposed opposite to each other, and the third detection element (241) extending out of the column (23121, 23221).

5. The gas detection device according to any one of claims 1-4, characterized in that, At least a portion of the third detection element (241) is located within the first through hole (211a), or at least a portion is located within the first housing (211); Alternatively, the third detection element (241) is located outside the first housing (211) and is projected along the axial direction of the first through hole (211a), with at least a portion of the projection of the third detection element (241) coinciding with at least a portion of the projection of the first through hole (211a).

6. The gas detection device according to claim 5, characterized in that, The first housing (211) has a first through hole (221a) on its wall facing the second housing (221), and the third detection element (241) is located between the first housing (211) and the second housing (221).

7. The gas detection device according to claim 3 or 4, characterized in that, The bracket structure (23) includes a first bracket (231), the first bracket (231) includes a first frame part (2313), the first housing (211) has a first limiting part (2111a), the second housing (221) has a second limiting part (2211a), the first frame part (2313) presses against the first limiting part (2111a) and the second limiting part (2211a) in a direction close to the circuit board (10), and the mounting bracket (2322) is located in the first frame part (2313).

8. The gas detection device according to claim 3 or 4, characterized in that, The support structure (23) includes a first support (231) and a second support (232). The first support (231) includes a first frame part (2313), the first housing (211) has a first limiting part (2111a), and the second housing (221) has a second limiting part (2211a). The second support (232) includes a second frame part (2323), at least a portion of the first limiting part (2111a) is located between the second frame part (2323) and the first frame part (2313), at least a portion of the second limiting part (2211a) is located between the second frame part (2323) and the first frame part (2313), and the mounting bracket (2322) is located in the second frame part (2323).

9. A gas detection device, characterized in that, The system includes a sensing assembly (20), which includes a first detection unit (21) and a second detection unit (22). The first detection unit (21) includes a first housing (211) and a first detection element (213), the first detection element (213) being located within the first housing (211), and the first housing (211) having a first through hole (211a). The second detection unit (22) includes a second housing (221) and a second detection element (223), the second detection element (223) being located within the second housing (221). The gas detection device further includes a third detection unit (24), the third detection unit (24) includes a third detection element (241), the gas detection device includes a circuit board (10), the bottom of the first housing (221) is provided with a first through hole (211a), and the third detection element (241) is located between the bottom of the first housing (221) and the circuit board (10).

10. The gas detection device according to claim 9, characterized in that, The third detection unit (24) is directly connected to the circuit board (10), or the gas detection device includes a support structure, the support structure and the circuit board (10) are limited, and at least a portion of the third detection unit (24) is limited to the support structure.

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