Sensing device

Abstract

The invention provides a sensing device which is used for improving the detection accuracy. The sensing device comprises a sensing assembly, the sensing assembly comprises a shell, and the shell is provided with a first detection cavity and a first detection element located in the first detection cavity; the shell comprises a first side wall part and a first bottom wall part which are used for limiting the first detection cavity, at least one of the first side wall part and the first wall part is provided with a communication hole, and the communication hole penetrates through the first side wall part or the first bottom wall part from inside to outside; the height of the communication hole is lower than the height of the first detection element.

Description

Technical Field

[0001] This application relates to the field of detection technology, specifically to a sensing 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 a gas chamber containing a thermistor. 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, resulting in a decrease 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, because the inlet is located at the top of the chamber, the refrigerant in the gas is easily dispersed before falling into the inlet, leading to inaccurate sensor readings. Summary of the Invention

[0004] The purpose of this application is to provide a sensing device for improving the accuracy of detection.

[0005] To address the aforementioned technical problems, this application provides a sensing device including a sensing assembly. The sensing assembly includes a housing and a first detection element. The housing has a first detection cavity, and the first detection element is located within the first detection cavity. The housing includes a first sidewall portion and a first bottom wall portion defining the first detection cavity. At least one of the first sidewall portion and the first bottom wall portion is provided with a communicating hole, which extends through the first sidewall portion or the first bottom wall portion along its inner and outer sides. With the first bottom wall portion as a reference, along the height direction of the sensing device, the height of the communicating hole relative to the first bottom wall portion is lower than the height of the first detection element relative to the first bottom wall portion.

[0006] As can be seen, the connecting hole of the sensing device in the above scheme extends through the first side wall or the first bottom wall along the inside and outside. The connecting hole can be used to connect the first detection chamber and the external connecting hole. The height of the connecting hole is set to be lower than the height of the first detection element. In this way, the refrigerant in the gas can be deposited at a lower position and enter the first detection chamber through the connecting hole. For example, the refrigerant after being blown away can also be deposited at a lower position due to gravity. When the refrigerant accumulates to a corresponding concentration, it will be sensed by the first detection element and an alarm will be triggered, thereby making the alarm prompt more accurate. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of the structure of the sensing device in one embodiment of this application;

[0008] Figure 2 for Figure 1 A partial structural schematic diagram of the central sensing device from a top-down view.

[0009] Figure 3 for Figure 2 Schematic sectional view along the middle AA direction;

[0010] Figure 4 for Figure 1 A schematic diagram of the sensing components in a medium-sized sensing device;

[0011] Figure 5 for Figure 3 A schematic diagram of the structure of the detection component;

[0012] Figure 6 for Figure 3 Schematic diagram of the structure of the inner cover;

[0013] Figure 7 for Figure 6 A sectional view of the central cover;

[0014] Figure 8 for Figure 3 Enlarged diagram of part B in the middle;

[0015] Figure 9 This is a schematic diagram of the structure of the cover of the sensing device in another embodiment of this application;

[0016] Figure 10 for Figure 9 A cross-sectional view of the middle cover along the first direction;

[0017] Figure 11 This is a schematic diagram of the structure of the cover of the sensing device in another embodiment of this application;

[0018] Figure 12 for Figure 11 A cross-sectional view of the middle cover along the first direction;

[0019] Figure 13 for Figure 1 Schematic diagram of the middle support base;

[0020] Figure 14 for Figure 13 Enlarged view of part D in the middle;

[0021] Figure 15 for Figure 3 Enlarged schematic diagram of part C in the middle;

[0022] Figure 16 for Figure 1Schematic diagram of the center positioning seat;

[0023] Figure 17 for Figure 1 Enlarged schematic diagram of part D in the middle.

[0024] The annotations in the attached figures are explained as follows:

[0025] 100 - Circuit board; 100a - Connecting hole;

[0026] 200 - Sensing component; 201 - Housing; 2011 - Annular flange; 201a - First detection cavity; 201b - Second detection cavity; 201c - Connecting channel;

[0027] 21-Cover body; 211-Top; 2111-First top wall; 2112-Second top wall; 212-First side wall; 2121-Flanged edge; 213-Separating wall; 21a-First cavity; 21b-Second cavity;

[0028] 21c - First channel; 21c1 - First opening; 21d - Second channel; 21d1 - First channel segment; 21d11 - Second opening; 21d2 - Second channel segment; 21d21 - Third opening;

[0029] 21e - Third channel; 21e1 - Third channel segment; 21e2 - Fourth channel segment; 21e21 - Fourth opening; 21f - Fourth channel; 21f1 - Fifth channel segment; 21f2 - Sixth channel segment; 21f21 - Fifth opening;

[0030] 21g - Fifth channel; 21g1 - Sixth opening; 21h - Sixth channel; 21h1 - Seventh opening;

[0031] 22-Positioning seat; 221-Annular positioning body; 2211-Arc-shaped positioning surface; 222-Positioning support;

[0032] 23-Support base; 231-Annular support body; 2311-Step section; 23111-Step sidewall; 23112-Step surface; 232-Support column; 23a-Window;

[0033] 24-Detection component; 241-First detection element; 242-Second detection element; 243-Base; 2431-First bottom wall; 2432-Second bottom wall; 2433-Edge; 243a-Connecting hole; 244-Pin. Detailed Implementation

[0034] 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.

[0035] In the embodiments of this application, the terms "first", "second", etc. are used only to describe the same or similar structures, and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0036] Please refer to Figures 1 to 4 , Figure 1 This is a schematic diagram of the structure of the sensing device in one embodiment of this application; Figure 2 for Figure 1 A partial structural schematic diagram of the central sensing device from a top-down view. Figure 3 for Figure 2 Schematic sectional view along the middle AA direction; Figure 4 for Figure 1 A schematic diagram of the structure of the sensing component 200 of the medium sensing device.

[0037] This embodiment provides a sensing device, which includes a circuit board 100 and a sensing component 200. The sensing component 200 and the circuit board 100 are electrically connected so that the signal detected by the sensing component 200 can be converted and transmitted to the outside. Figure 1 The diagram illustrates a circuit board 100, a sensing component 200 mounted on the circuit board 100, and various other electrical components such as capacitors and control modules. However, the outer casing of the sensing device is not shown. The casing protects the circuit board 100, the sensing component 200, and the other electrical components. In this embodiment, the sensing device is used for gas detection; therefore, the casing has openings to allow gas to enter the sensing device and be detected by the sensing component 200. For example, this sensing device is used to detect refrigerant in an air conditioning system. The sensing 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 sensing device.

[0038] like Figure 3As shown, the sensing component 200 includes a housing 201, which has a first detection cavity 201a and a first detection element 241. The first detection element 241 is located within the first detection cavity 201a and is used to detect gas. The first detection element 241 is, for example, a thermistor, more specifically, a thermistor. When gas enters the first detection cavity 201a, its thermal conductivity affects the heat dissipation of the thermistor. If the gas has a high thermal conductivity, heat will dissipate more easily from the thermistor, resulting in a decrease in the resistance of the thermistor. In this embodiment, the housing 201 also has a second detection cavity 201b, and the sensing component 200 further includes a second detection element 242 located within the second detection cavity 201b. According to the Wheatstone bridge principle, under the combined action of the first detection element 241 and the second detection element 242, 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 sensing device is, for example, a MEMS (Micro Electromechanical System). The principle of gas concentration detection by the sensing component 200 is a known technology and will not be discussed further.

[0039] As described above, during detection, the first detection chamber 201a needs to be filled with the gas to be detected, thus it is connected to the outside. The second detection chamber 201b, however, is not connected to the outside and is a closed cavity. In this embodiment, the housing 201 is provided with a connecting hole 243a, through which the gas to be detected enters the first detection chamber 201a. Specifically, the housing 201 includes a wall portion defining the first detection chamber 201a. This wall portion includes a first side wall portion 212, a first top wall portion 2111, and a first bottom wall portion 2431. The connecting hole 243a penetrates the wall portion defining the first detection chamber 201a both internally and externally. That is, the connecting hole 243a forms openings on both the inner and outer surfaces of the wall portion. The inner surface of the wall portion faces the first detection chamber 201a, and the outer surface faces away from it. The outer surface of the wall portion of the housing 201 faces the inner cavity of the entire outer shell of the sensing device.

[0040] It should be noted that, in this application, the sensing device is defined in its normal operating state with the circuit board 100 located below and the sensing component 200 located above the circuit board 100. This defines the vertical direction. Correspondingly, the distribution direction of the first top wall portion 2111 and the first bottom wall portion 2431 of the housing 201 is the vertical direction, with the first top wall portion 2111 located above the first bottom wall portion 2431. The vertical direction is also the vertical direction. Figure 3 , 4The indicated direction. At this time, the connecting hole 243a is configured such that its height is lower than the height of the first detection element 241, i.e., its position in the vertical direction. Therefore, in this embodiment, the connecting hole 243a is disposed on the first bottom wall portion 2431.

[0041] With the first bottom wall portion 2431 as a reference, along the height direction of the sensing device (i.e., the up-down direction mentioned above), the height of the connecting hole 243a relative to the first bottom wall portion 2431 is lower than the height of the first detection element 241 relative to the first bottom wall portion 2431. If the connecting hole 243a is located on the first bottom wall portion 243, the height of the connecting hole 243a relative to the first bottom wall portion 243 can be considered as 0. From another perspective, since the housing 201 is located above the circuit board 100, with the circuit board 100 as a reference, the distance of the first detection element 241 from the circuit board 100 in the up-down direction is the height of the first detection element 241, and the distance of the connecting hole 243a from the circuit board 100 is the height of the connecting hole 243a. If the height of the connecting hole 243a is lower than the height of the first detection element 241, then the connecting hole 243a is located below the first detection element 241.

[0042] For example, the housing 201 in this embodiment is a split structure, specifically including a cover 21 and a base 243. It is understood that this is merely one structural form of the housing 201, and the housing 201 is not limited to this. For example, it can be a one-piece structure, or composed of a lower cover and a cover plate covering the upper opening of the cover, etc., which will not be elaborated further. Please refer to [further details]. Figure 1 , 3 4, and combined Figure 5 understand, Figure 5 for Figure 3 A schematic diagram of the structure of the detection component 24.

[0043] The detection component 24 in this embodiment includes the first detection element 241 and the second detection element 242 described above. The detection component 24 also includes a base 243 for mounting the first detection element 241 and the second detection element 242. Figure 5 As shown, the base 243 is generally a plate-shaped structure. The first detection element 241 and the second detection element 242 are located above the base 243. A pin 244 is provided below the base 243. The pin 244 can be electrically connected to the first detection element 241 and the second detection element 242. The pin 244 can be plugged into the circuit board 100 to achieve electrical connection, thereby realizing the electrical connection between the first detection element 241, the second detection element 242 and the circuit board 100.

[0044] Let's look again. Figure 6 , Figure 6 for Figure 3 A schematic diagram of the structure of the middle cover 21.

[0045] The bottom of the cover 21 has an opening, and the base 243 and the opening of the cover 21 are sealed together. The cover 21 has a partition wall 213 inside, such as... Figure 3 As shown, the partition wall 213 divides the inner cavity of the housing 201 into a first detection cavity 201a and a second detection cavity 201b. Specifically, as... Figure 6 As shown, the partition wall 213 divides the inner cavity of the cover 21 into a first cavity 21a and a second cavity 21b. After the base 243 and the cover 21 are engaged, the bottom of the first cavity 21a and the second cavity 21b are sealed, forming a first detection cavity 201a and a second detection cavity 201b.

[0046] In this embodiment, the first detection chamber 201a of the sensing component 200 is connected to the outside through a connecting hole 243a, allowing gas to enter and be detected. The second detection chamber 201b is a closed chamber, isolated from the outside. For Figure 3 The housing 201 has a base 243 at its bottom and a side and top 211 of the housing 201, which are the side and top of the cover 21, respectively. The base 243 includes a first bottom wall 2431, which corresponds to the first detection cavity 201a. The first bottom wall 2431 is the part of the base 243 that defines the first detection cavity 201a. The base 243 also includes a second bottom wall 2432, which corresponds to the second detection cavity 201b. The second bottom wall 2432 is the part of the base 243 that defines the second detection cavity 201b. The first bottom wall 2431 and the second bottom wall 2432 can be thickened relative to other parts of the base 243 to more reliably connect the first detection element 241, the second detection element 242, and the pin 244. The top portion of the cover 21 is a first top wall portion 2011, and the top portion is a second top wall portion 2012. The first top wall portion 2011 corresponds to the first detection cavity 201a, that is, the first top wall portion 2011 is used to define the first detection cavity 201a. The second top wall portion 2012 corresponds to the second detection cavity 201a, that is, the second top wall portion 2012 can be used to define the second detection cavity 201b. In this embodiment, the connecting hole 243a is provided in the first bottom wall portion 2431, such as... Figure 3 As shown, the connecting hole 243a extends through the first bottom wall portion 2431 in the vertical direction. Since the first detection element 241 is located above the first bottom wall portion 2431, the height of the connecting hole 243a must be lower than the height of the first detection element 241.

[0047] In this embodiment, the sensing device is used to detect the concentration of refrigerant in the gas, where the density of the refrigerant is greater than that of air. Technicians have found that the alarm accuracy of the sensing devices in the background art is insufficient because the refrigerant concentration is easily affected by the environment as it falls with the air. For example, airflow can disperse the refrigerant, preventing it from entering the detection chamber from the top inlet of the gas chamber, thus leading to inaccurate detection. In this embodiment, the sensing device has the connecting hole 243a located at the bottom of the housing 201. The refrigerant in the gas will descend to the bottom due to gravity (the dispersed refrigerant will still fall to the bottom under gravity) and enter the first detection chamber 201a through the connecting hole 243a. The refrigerant will gradually accumulate at the bottom of the first detection chamber 201a. During the accumulation process, the thermal conductivity in the first detection chamber 201a will gradually change, causing the temperature of the first detection element 241 to gradually change as well. When the refrigerant accumulates to a certain amount, the temperature of the first detection element 241 will also reach the set value. According to the Wheatstone bridge principle, under the combined action of the first detection element 241 and the second detection element 242, the sensing device will issue an alarm.

[0048] This embodiment of the sensing device is particularly suitable for scenarios where the sensor is placed in a corner, such as when the sensor is close to a wall. It can be understood that the purpose of this embodiment is to lower the position of the connecting hole 243a, ensuring that the height of the connecting hole 243a is lower than the height of the first detection element 241. This allows the refrigerant in the gas to accumulate and reach a position detectable by the first detection element 241, thus ensuring detection accuracy. Therefore, besides placing the connecting hole 243a in the first bottom wall portion 2431, it can also be placed in other positions, such as at the lower end of the first side wall portion 212, as long as its height is lower than the height of the first detection element 241.

[0049] You can continue to refer to this. Figure 5 In this embodiment, the first bottom wall portion 2431 can be provided with multiple connecting holes 243a. This increases the amount of gas entering the first detection chamber 201a, enabling more timely detection of the refrigerant concentration in the gas. When multiple connecting holes 243a are provided, at least one connecting hole 243a is located in the middle of the first bottom wall portion 2431 to ensure the uniformity of gas accumulation towards the first detection element 241 after entering. The remaining connecting holes 243a can be arranged around the middle connecting hole 243a.

[0050] Furthermore, the housing 201 in this embodiment also has a communication channel 201c, such as Figure 7 As shown, Figure 7 for Figure 6 A cross-sectional view of the middle cover 21.

[0051] The connecting channel 201c connects the first detection chamber 201a and the outside of the housing 201. The housing 201 includes a first top wall portion 2111 defining the first detection chamber 201a. The length of the connecting channel 201c is greater than the thickness of the first top wall portion 2111. The connecting channel 201c and the connecting hole 243a enable convection, allowing gas to enter the first detection chamber 201a more promptly. Gas can enter the first detection chamber 201a through the connecting hole 243a and then flow out through the connecting channel 201c. Of course, some gas can also enter the first detection chamber 201a through the connecting channel 201c, further increasing the amount of gas entering the first detection chamber 201a and improving the timeliness of detection.

[0052] In some embodiments, a portion of the connecting channel 201c may be located in the wall of the housing 201 that defines the second detection cavity 201b. In this way, if the connecting channel 201c needs to connect to the first detection cavity 201a, then a portion of the connecting channel 201c must still be located in the wall corresponding to the first detection cavity 201a. Thus, the connecting channel 201c spans the walls corresponding to the two detection cavities, which can enhance the convection effect of the connecting channel 201c.

[0053] Furthermore, the connecting channel 201c has an opening in the wall corresponding to the second detection cavity 201b, that is, the opening of the connecting channel 201c and the outside is provided in the wall corresponding to the second detection cavity 201b, while the opening of the connecting hole 243a for communicating with the outside is provided in the wall corresponding to the first detection cavity 201a. The first detection cavity 201a and the second detection cavity 201b are arranged alternately, which is conducive to the generation of convection.

[0054] like Figure 7 As shown, the connecting channel 201c includes a first channel 21c and a second channel 21d. The second top wall portion 2112 of the housing 21 has the first channel 21c. One end of the first channel 21c has an opening on the outer surface of the second top wall portion 2112, which can be defined as a first opening 21c1. The first opening 21c1 connects to the outside of the sensing component 200. The other end of the first channel 21c connects to the second channel 21d. The second channel 21d is disposed in the partition wall portion 213 (the partition wall portion 213 simultaneously serves as part of the side wall portion of the first detection cavity 201a and the second detection cavity 201b). The second channel 21d connects to the first detection cavity 201a. Specifically, the first channel 21c can be a straight channel extending along a first direction, which is the distribution direction of the first detection cavity 201a and the second detection cavity 201b. With this configuration, the convection effect of the connecting channel 201c is more pronounced. The first opening 21c1 can face the side of the housing 201, i.e., it is positioned in a horizontal direction.

[0055] Specifically in this embodiment, it can be combined with Figure 8 understand, Figure 8 for Figure 3 Enlarged diagram of part B in the middle.

[0056] The second channel 21d in the partition wall 213 includes a straight first channel segment 21d1 and a straight second channel segment 21d2. The first channel segment 21d1 extends vertically. To facilitate processing, one end of the first channel segment 21d1 may have an opening at the bottom end face of the partition wall 213, which can be defined as a second opening 21d11. This facilitates the processing of the first channel segment 21d1. Figure 3 As shown, after assembly, the partition wall 213 can abut against the upper surface of the base 243 to seal the second opening 21d11, and the partition wall 213 and the base 243 can be sealed together. One end of the first channel 21c is the first opening 21c1, and the other end is connected to one end of the first channel segment 21d1. One end of the second channel segment 21d2 is connected to the first channel segment 21d1, and the other end has an opening on the surface of the partition wall 213 facing the first detection cavity 201a, which can be defined as the third opening 21d21. Figure 8 In this design, the first channel segment 21d1 extends vertically, and the second channel segment 21d2 is perpendicular to the first channel segment 21d1. The second channel segment 21d2 can extend along a first directional indicator and connects to the side of the first channel segment 21d1, thereby connecting the second channel 21d and the first detection cavity 201a. It can be seen that the second channel 21d is not limited to a two-segment configuration. For example, the second channel 21d can be a straight, inclined channel to connect the first channel 21c and the first detection cavity 201a. Comparatively, a segmented design is easier to manufacture. The number of connecting channels 201c can be one or more. Figure 6 The diagram shows three second openings 21d11 and three first openings 21c1, which means that three connecting channels 201c are set.

[0057] It should be understood that the connection channel 201c is not limited to... Figure 7 The combination of the first channel 21c and the second channel 21d is shown below. Please refer to further details. Figure 9 and Figure 10 understand, Figure 9 This is a schematic diagram of the structure of the cover 21 of the sensing device in another embodiment of this application; Figure 10 for Figure 9 A cross-sectional view of the middle cover 21 along the first direction.

[0058] exist Figure 9 , 10In the illustrated embodiment, the connecting channel 201c includes a third channel 21e and a fourth channel 21f. The third channel 21e is disposed at the top 211 of the housing 201, and the fourth channel 21f is disposed at the side wall portion corresponding to the second detection cavity 201b, specifically at the side wall portion away from the first detection cavity 201a. The third channel 21e includes a third channel segment 21e1 and a fourth channel segment 21e2 that are connected. The third channel segment 21e1 extends from the second top wall portion 2112 to the first top wall portion 2111, and can be a straight channel extending along a first direction. One end of the third channel segment 21e1 is connected to the upper end of the fourth channel 21f, and the other end of the third channel segment 21e1 is connected to the fourth channel segment 21e2. The fourth channel segment 21e2 has an opening on the inner surface of the first top wall portion 2111 facing the first detection cavity 201a, which can be defined as a fourth opening 21e21. The third channel 21e connects to the first detection cavity 201a through the fourth opening 21e21. The fourth channel 21f includes a fifth channel segment 21f1 and a sixth channel segment 21f2. The fifth channel segment 21f1 extends vertically, and its upper end is connected to the third channel 21e. The lower end of the fifth channel segment 21f2 is connected to the sixth channel segment 21f2. One end of the sixth channel segment 21f2 has an opening on the outer surface of the side wall corresponding to the second detection cavity 201b, which can be defined as the fifth opening 21f21.

[0059] Please continue to combine Figure 11 and Figure 12 understand, Figure 11 This is a schematic diagram of the structure of the cover 21 of the sensing device in another embodiment of this application; Figure 12 for Figure 11 A cross-sectional view of the middle cover 21 along the first direction.

[0060] exist Figure 11 , 12 In the illustrated embodiment, the communication channel 201c includes a fifth channel 21g and a sixth channel 21h. The entire communication channel 201c is disposed on the top 211 of the housing 201. The fifth channel 21g extends from the second top wall portion 2112 to the first top wall portion 2111. The fifth channel 21g can be a straight channel extending along a first direction. One end of the fifth channel 21g forms an opening on the outer surface of the wall portion corresponding to the second detection cavity 201b, defined as the sixth opening 21g1. Figure 12 The sixth opening 21g1 faces the side of the shell 201. The sixth channel 21h extends vertically, with one end of the sixth channel 21h (i.e. Figure 12 The upper end of the middle channel 21g is connected to the other end of the fifth channel 21g, and the other end of the sixth channel 21h (i.e. Figure 12The lower end of the housing 201 has a seventh opening 21h1 on the inner surface of the first top wall 2111 facing the first detection cavity 201a, and the sixth channel 21h is connected to the first detection cavity 201a through the seventh opening 21h1. In this embodiment, the third channel 21e and the fourth channel 21f are both located on the top 211 of the housing 201, which is convenient for processing.

[0061] The above illustrates various arrangements of the connecting channel 201c on the housing 201. One end of the connecting channel 201c has an opening on the inner surface corresponding to the first detection cavity 201a, and the other end has an opening on the outer surface of the housing 201 corresponding to the second detection cavity 201b, so as to achieve communication between the outside and the first detection cavity 201a, and the convection effect of the connecting channel 201c is relatively good. However, it is understood that the connecting channel 201c is not limited to being set on the wall corresponding to the second detection cavity 201b. For example, it can be set only on the wall corresponding to the first detection cavity 201a, or more specifically, it can be set on the first top wall 2111, which can be a zigzag channel. Alternatively, part of the connecting channel 201c can be set on the wall corresponding to the second detection cavity 201b, but the opening communicating with the outside can still be set on the wall corresponding to the first detection cavity 201a.

[0062] In this embodiment, the length of the connecting channel 201c can be set to be greater than the length of the connecting hole 243a. The gas mainly enters and accumulates through the connecting hole 243a for detection, while the connecting channel 201c is mainly set to form convection, which facilitates the gas to enter through the connecting hole 243a and flow out through the connecting channel 201c. Of course, as mentioned above, some gas will also enter the first detection chamber 201a through the connecting channel 201c.

[0063] Please continue to refer to this. Figure 13 , Figure 13 for Figure 1 A schematic diagram of the structure of the middle support 23.

[0064] The sensing device in this embodiment also includes an annular support 23, which is located below and supports the housing 201. The side of the support 23 has a window 23a. Figure 1As shown, when the sensing device is installed on the circuit board 100, the support base 23 can support the circuit board 100, creating a gap between the housing 201 and the circuit board 100 in the vertical direction. The height of the inner cavity of the annular support base 23 is the height of the gap between the bottom of the housing 201 and the circuit board 100. Simultaneously, a window 23a is provided on the side of the support base 23, allowing gas to enter the support base 23 through the window 23a and then enter the first detection chamber 201a through the connecting hole 243a provided in the first bottom wall portion 2431 of the housing 201. In other words, by providing the support base 23, gas can more smoothly enter the first detection chamber 201a from the bottom of the housing 201 upwards. Of course, if the connecting hole 243a is located at the lower edge of the housing 201, the support base 23 may not be required. In comparison, if the connecting hole 243a is located at the bottom of the housing 201, the refrigerant will gradually accumulate for more accurate detection, which is more effective. The support base 23 allows the solution of setting the connecting hole 243a at the bottom of the housing 201 to be better implemented.

[0065] For example, the support base 23 in this embodiment includes an annular support body 231 and a plurality of support columns 232 disposed at the bottom of the annular support body 231, with windows 23a formed between adjacent support columns 232. The support columns 232 can directly abut against the circuit board 100. This method of forming windows 23a results in a larger area of ​​windows 23a, allowing for smoother gas entry. Obviously, under the premise of ensuring strength and reliability, the support columns 232 can be set to be as thin as possible to ensure that gas can enter the interior of the support base 23 more promptly.

[0066] like Figure 14 As shown, Figure 14 for Figure 13 Enlarged view of part D in the middle.

[0067] The upper surface of the annular support body 231 has a stepped portion 2311, which includes a stepped sidewall 23111 and a stepped surface 23112 located inside the stepped sidewall 23111. The stepped sidewall 23111 extends upward, and the stepped surface 23112 also faces upward. Both the stepped sidewall 23111 and the stepped surface 23112 are annular, with the direction closer to the center of the annulus being inward and the opposite being outward. The shell 201 is supported by the stepped surface 23112, and the stepped sidewall 23111 can also limit the shell 201, confining it to the inside of the stepped sidewall 23111, making the support connection of the shell 201 more reliable.

[0068] Specifically, it can be further combined Figure 15 , 16 understand, Figure 15 for Figure 3 Enlarged schematic diagram of part C in the middle; Figure 16 for Figure 1 A schematic diagram of the structure of the central positioning seat 22.

[0069] In this embodiment, the bottom of the housing 201 has an annular flange 2011. Specifically, the lower end of the cover 21 has a flange 2121, and the base 243 of the detection component 24 has an edge 2433. The edge 2433 abuts upward against the flange 2121. The flange 2121 and the edge 2433 of the base 243 combine to form the annular flange 2011 of the housing 201. At this time, the sensing device also includes a positioning seat 22, which includes an annular positioning body 221. The housing 201 passes through the annular positioning body 221, that is, the annular positioning body 221 is sleeved on the outside of the housing 201, and a portion of the housing 201 is located inside the annular positioning body 221. The annular positioning body 221 abuts downward against the annular flange 2011 of the housing 201, specifically against the flange 2121 of the cover 21. The positioning seat 22 also includes a positioning support 222 located at the bottom of the annular positioning body 221. The positioning support 222 is connected to the circuit board 100, so the positioning seat 22 can position the housing 201 and the support seat 23 onto the circuit board 100.

[0070] The connection method between the positioning support 222 and the circuit board 100 is not limited, such as... Figure 17 As shown, Figure 17 for Figure 1 An enlarged view of part E in the middle. A connection hole 100a can be provided on the circuit board 100. The positioning support 222 can be set as a snap-fit ​​structure to snap into the connection hole 100a. The positioning support 222 and the circuit board 100 can also be detachably connected by fasteners or other means, etc., which will not be listed one by one.

[0071] In addition, such as Figure 4 , 17 As shown, the cover 21 of the housing 201 has arc-shaped sidewalls at both ends along the first direction, and the inner surface of the annular positioning body 221 has an arc-shaped positioning surface 2211. The arc-shaped positioning surface 2211 and the outer surface of the sidewall of the cover 21 are adapted to fit together and contact each other, thereby reliably limiting the cover 21.

[0072] 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 sensing device, characterized in that, The device includes a sensing assembly (200), which includes a housing (201) and a first detection element (241). The housing (201) has a first detection cavity (201a), and the first detection element (241) is located within the first detection cavity (201a). The housing (201) includes a first sidewall portion (212) defining the first detection cavity (201a) and a first bottom wall portion (2431). At least one of the first sidewall portion (212) and the first bottom wall portion (2431) is provided with a connecting hole (243a), which extends through the first sidewall portion (212) or the first bottom wall portion (2431) along the inner and outer sides. With the first bottom wall portion (2431) as a reference, along the height direction of the sensing device, the height of the connecting hole (243a) relative to the first bottom wall portion (2431) is lower than the height of the first detection element (241) relative to the first bottom wall portion (2431).

2. The sensing device according to claim 1, characterized in that, The housing (201) also has a communication channel (201c) that connects the first detection cavity (201a) and the outside of the housing (201).

3. The sensing device according to claim 2, characterized in that, The sensing assembly (200) further includes a second detection element (242), and the housing (201) further has a second detection cavity (201b), in which the second detection element (242) is located; A portion of the communication channel (201c) is located in the wall of the housing (201) that defines the second detection cavity (201b).

4. The sensing device according to claim 3, characterized in that, The sensing component (200) includes a detection component (24), which includes a first detection element (241) and a second detection element (242). The detection component (24) also includes a base (243) for mounting the first detection element (241) and the second detection element (242). The housing (201) includes a cover (21) and a base (243). The bottom of the cover (21) has an opening, and the base (243) and the opening of the cover (21) are sealed together. The cover (21) has a partition wall (213) inside, which separates the inner cavity of the housing (201) into the first detection cavity (201a) and the second detection cavity (201b). The base (243) is partly the first bottom wall (2431) and partly the second bottom wall (2432) for defining the second detection cavity (201b). The top wall of the cover is partly the first top wall (2111), which corresponds to the first detection cavity (201a), and partly the top wall of the cover is partly the second top wall (2112), which corresponds to the second detection cavity (201b). A portion of the connecting channel (201c) is located in the second top wall portion (2112).

5. The sensing device according to claim 4, characterized in that, The connecting channel (201c) includes a first channel (21c) and a second channel (21d). The first channel (21c) is located in the second top wall portion (2112), and one end of the first channel (21c) has a first opening (21c1) on the outer surface of the second top wall portion (2112). The second channel (21d) is located in the partition wall portion (213), and the second channel (21d) connects the first channel (21c) and the first detection cavity (201a).

6. The sensing device according to claim 5, characterized in that, The second channel (21d) includes a first channel segment (21d1) and a second channel segment (21d2). The first channel segment (21d1) extends vertically. The first channel (21c) has an end opposite to the first opening (21c1). The other ends of the first channel segment (21d1) and the first channel (21c) are connected. One end of the second channel segment (21d2) is connected to the first channel segment (21d1), and the other end has a third opening (21d21) on the surface of the partition wall (213) facing the first detection cavity (201a). The first channel segment (21d1) has a second opening (21d11) on the bottom end face of the partition wall (213). The partition wall (213) abuts against the base (243).

7. The sensing device according to claim 4, characterized in that, The connecting channel (201c) includes a third channel (21e) and a fourth channel (21f); the third channel (21e) includes a third channel segment (21e1) and a fourth channel segment (21e2) that are connected to each other, the third channel segment (21e1) extending from the second top wall portion (2112) to the first top wall portion (2111), and the fourth channel segment (21e2) having a fourth opening (21e21) on the inner surface of the first top wall portion (2111) facing the first detection cavity (201a). The fourth channel (21f) includes a fifth channel segment (21f1) and a sixth channel segment (21f2) that are connected. The fifth channel segment (21f1) extends vertically, and the sixth channel segment (21f2) has a fifth opening (21f21) on the outer surface of the side wall portion corresponding to the second detection cavity (201b).

8. The sensing device according to claim 4, characterized in that, The connecting channel (201c) includes a fifth channel (21g) and a sixth channel (21h). The fifth channel (21g) extends from the second top wall portion (2112) to the first top wall portion (2111). One end of the fifth channel (21g) has a sixth opening (21g1) on the outer surface of the wall portion corresponding to the second detection cavity (201b). One end of the sixth channel (21h) is connected to the other end of the fifth channel (21g). The other end of the sixth channel (21h) has a seventh opening (21h1) on the inner surface of the first top wall portion (2111) facing the first detection cavity (201a).

9. The sensing device according to any one of claims 1-8, characterized in that, The first bottom wall portion (2431) has a plurality of the communicating holes (243a), at least one of the communicating holes (243a) being located in the middle of the first bottom wall portion (2431).

10. The sensing device according to any one of claims 1-8, characterized in that, The sensing assembly (200) further includes an annular support (23) located below and supporting the housing (201), and the side of the support (23) has a window (23a); the sensing device further includes a circuit board (100), on which the support (23) is supported.

11. The sensing device according to claim 10, characterized in that, The support base (23) includes an annular support body (231) and a plurality of support columns (232) disposed at the bottom of the annular support body (231), and the window (23a) is formed between adjacent support columns (232); the support columns (232) are supported on the circuit board (100).

12. The sensing device according to claim 11, characterized in that, The upper end face of the annular support body (231) has an annular step portion (2311), the step portion (2311) includes a step sidewall (23111) and a step face portion (23112) located inside the step sidewall (23111), and the shell (201) is supported on the step face portion (23112).

13. The sensing device according to claim 12, characterized in that, The bottom of the housing (201) has an annular flange (2011); the sensing component (200) also includes a positioning seat (22), the positioning seat (22) includes an annular positioning body (221), a portion of the housing (201) is located inside the annular positioning body (221), the annular positioning body (221) abuts against the annular flange (2011); the positioning seat (22) also includes a positioning support (222) located at the bottom of the annular positioning body (221), the positioning support (222) is connected to the circuit board (100).

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