Detection device

Abstract

A detection device includes a gas detection probe, a first housing, and a second housing. The gas detection probe includes a detection part and a main body part. The detection part includes a thermistor. The main body part has an inner cavity, and the detection part is located within the inner cavity. There is a gap between the detection part and the main body part. At least a portion of the main body part is located within the second housing. The first housing is located around the gas detection probe and the second housing, and both the gas detection probe and the second housing are located within the first housing. By setting a double-housing structure including a first housing and a second housing outside the gas detection probe, the influence of the external environment on the gas detection probe can be reduced, and the accuracy of gas detection can be improved.

Description

Technical Field

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

[0002] The detection device includes a gas detection probe and a one-piece injection-molded first housing, with the gas detection probe housed within the first housing. The gas detection probe includes a thermistor, which detects gas by utilizing the characteristic that the thermistor's resistance changes with temperature. Because the first housing provides limited protection against the gas detection probe's external environment, the external environment can easily affect the gas detection probe, reducing the accuracy of gas detection.

[0003] Therefore, it is necessary to improve the structure of the detection device to reduce the influence of the external environment on the gas detection probe. Summary of the Invention

[0004] To address the aforementioned problems, this application provides a gas detection device with high accuracy.

[0005] This application provides a detection device, which includes a gas detection probe, a first housing, and a second housing. The gas detection probe includes a detection part and a main body part. The detection part includes a thermistor. The main body part has an inner cavity, and the detection part is located in the inner cavity. There is a gap between the detection part and the main body part. At least a portion of the main body part is located inside the second housing part. The first housing part is located outside the gas detection probe and the second housing part. Both the gas detection probe and the second housing part are located inside the first housing part.

[0006] In this application, the gas detection probe includes a detection section and a main body. The detection section includes a thermistor and is located within the cavity of the main body. At least a portion of the main body is located within a second housing, and both the gas detection probe and the second housing are located within a first housing. This application provides a double-housing structure, including a first housing and a second housing, outside the gas detection probe, which can reduce the influence of the external environment on the gas detection probe and improve the accuracy of gas detection. Attached Figure Description

[0007] Figure 1 This is a schematic diagram of a detection device provided in one embodiment of this application;

[0008] Figure 2 This is an exploded view of a detection device provided in one embodiment of this application;

[0009] Figure 3 This is a cross-sectional view of a gas detection probe and circuit board provided in one embodiment of this application;

[0010] Figure 4This is a cross-sectional view of a detection device provided in one embodiment of this application;

[0011] Figure 5 This is an exploded view of a gas detection probe, mounting bracket, and circuit board provided in one embodiment of this application;

[0012] Figure 6 This is a perspective view of the second housing provided in one embodiment of this application;

[0013] Figure 7 This is a perspective view of the second housing provided in one embodiment of this application;

[0014] Figure 8 This is a schematic diagram of a detection device provided in another embodiment of this application;

[0015] Figure 9 This is an exploded view of a detection device provided in another embodiment of this application;

[0016] Figure 10 This is a schematic diagram of the cooperation between the gas detection probe, the second housing, and the circuit board provided in another embodiment of this application;

[0017] Figure 11 This is a cross-sectional view of a gas detection probe, a second housing, a circuit board, and a waterproof and breathable membrane provided in another embodiment of this application;

[0018] Figure 12 This is a schematic diagram showing the assembly of a gas detection probe, a second housing, a first housing, a waterproof and breathable membrane, and a circuit board according to another embodiment of this application.

[0019] Figure 13 This is a perspective view of the second housing provided in another embodiment of this application;

[0020] Figure 14 This is a perspective view of the second housing provided in another embodiment of this application;

[0021] Figure 15 This is a cross-sectional view of the second housing provided in another embodiment of this application. Detailed Implementation

[0022] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0023] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0024] In related technologies, the detection device 1000 includes a detection module 100 and a first housing 3. The detection module 100 is located within the cavity of the first housing, thereby protecting the detection module 100. The detection module 100 includes a gas detection probe 1, which includes a main body 12 with an open inner cavity. A detection part 11 is disposed within the main body 12 and located within the open inner cavity. Gas can flow into the open inner cavity from the outside of the detection device and come into contact with the detection part 11 to detect gas-related parameters. The detection part 11 includes a thermistor, and the detection device utilizes the change in resistance of the thermistor with temperature. For example, the detection device can be used to detect refrigerant leaks. When a refrigerant leak occurs, the thermal conductivity of the gas flowing into the open inner cavity from the outside of the detection device changes, causing a change in the heat conducted from the outside to the thermistor through the gas, which in turn causes a change in the resistance of the thermistor. The electrical signal of the resistance change is processed and converted into a refrigerant leak alarm signal.

[0025] In related technologies, apart from the first housing 3, no other isolation structure is provided between the gas detection probe 1 and its external environment. The external environment can easily affect the gas detection probe 1's detection, reducing its accuracy. For example, heat from convection and wind in the external environment, or heat generated by other electronic components inside the detection device besides the gas detection probe 1, can cause a temperature difference between the gas detection probe 1 and its external environment. Even without refrigerant leakage, the resistance of the thermistor may change significantly, leading to reduced gas detection accuracy and even false alarms from the detection device.

[0026] This application provides a detection device 1000, for example... Figure 1 and Figure 8 As shown, the device includes a gas detection probe 1, a first housing 3, and a second housing 2. The gas detection probe includes a detection part 11 and a main body 12. The detection part 11 includes a thermistor. The main body 12 has an inner cavity 13, and the detection part 11 is located within the inner cavity 13. There is a gap between the detection part 11 and the main body 12. At least a portion of the main body 12 is located within the second housing 21. The first housing 3 is located around the gas detection probe 1 and the second housing 2, and both the gas detection probe 1 and the second housing 2 are located within the first housing 3, for example... Figure 2 and Figure 4 ,or, Figure 9 , Figure 11 and Figure 12 As shown.

[0027] In this application, the gas detection probe 1 includes a detection part 11 and a main body 12. The detection part 11 includes a thermistor and is located within the cavity 13 of the main body 12. At least a portion of the main body 12 is located within a second housing 2, and both the gas detection probe 1 and the second housing 2 are located within a first housing 3. This application provides a double-housing structure, including a first housing 3 and a second housing 2, outside the gas detection probe, which better isolates the gas detection probe 1 from its external environment, reduces the influence of the external environment on the gas detection probe 1, and improves the accuracy of gas detection.

[0028] It can be understood that the external environment of the detection device is part of the external environment of the gas detection probe 1; a portion of the internal environment of the detection device, such as other electronic components included in the detection device besides the gas detection probe and the heat they generate, also belongs to the external environment of the gas detection probe 1. Changes in the external environment of the gas detection probe mainly come from two sources. First, changes in the external environment of the detection device, such as temperature changes caused by convection, wind, natural temperature fluctuations, or other factors. Second, changes in the internal environment of the detection device, primarily caused by temperature changes resulting from the heat generated by the other electronic components included in the detection device besides the gas detection probe 1 during operation.

[0029] In some embodiments, the detection device includes a detection module 100 and other modules besides the detection module 100. The detection module 100 includes a gas detection probe 1. The detection module 100 and other modules are located within a first housing 3, while at least a portion of the other modules are located outside a second housing 2. Thus, the second housing 2 not only assists the first housing 3 in enhancing the isolation between the gas detection probe 1 and the external environment of the detection device, reducing heat transfer between them, but also isolates the gas detection probe 1 from the other modules included in the detection device, reducing heat transfer between them. These other modules may be, for example, a processing module 200 for processing the detection signals from the detection module.

[0030] In some embodiments, the gas detection probe 1 includes a detection assembly 10, which includes a detection part 11 and a conductive part 14. The conductive part 14 includes a lead-out part 141 and a conductive terminal 142. The lead-out part 141 is connected to the detection part 11, and the lead-out part 141 is connected to the conductive terminal 142. The lead-out part 141 is located in the inner cavity 13 of the main body 12, a portion of the conductive terminal 142 is located in the inner cavity 13 of the main body, and the other portion of the conductive terminal 142 is located outside the main body 12. In some embodiments, the main body 12 includes a cap 1201 and a base 1202. The cap 1201 is fixedly connected to the base 1202, and the conductive terminal 142 is disposed through the base 1202 and fixedly connected to the base 1202. Both the cap 1201 and the base 1202 are located on the periphery of the inner cavity 13, for example... Figure 3 , Figure 4 and Figure 11 As shown.

[0031] In some embodiments, the gas detection probe 1 includes a first detection probe 15 and a second detection probe 16. For example Figures 2-5 As shown or Figures 9-12 As shown, the first detection probe 15 includes a first detection part 111 and a first main body 121. The first main body 121 has a first cavity 131, which is in gaseous communication with the external environment of the detection device. The first detection part 111 includes a thermistor and is located in the first cavity 131. There is a gap between the first detection part 111 and the first main body 121. The second detection probe 16 includes a second detection part 112 and a second main body 122. The second main body 122 has a second cavity 132, which is not in communication with the external environment of the detection device. The second detection part 112 includes a thermistor and is located in the second cavity 132. There is a gap between the second detection part 112 and the second main body 122. In some embodiments, there is a gap between the first detection probe 15 and the second detection probe 16, and a gap between the first main body 121 and the second main body 122. During detection, the first detection unit 111 outputs a detection signal, and the second detection unit 112 outputs a reference signal. The processing module 200 uses the reference signal to correct the detection signal, thereby improving detection accuracy. At least a portion of the first main body 121 is located within the second housing 2, and at least a portion of the second main body 122 is located within the second housing 2. Thus, the second housing 2 not only isolates the first detection probe 15 from its external environment but also isolates the second detection probe 16 from its external environment. In other words, the second housing 2, which is disposed within the second housing 2, is shared by the first main body 121 and the second main body 122.

[0032] In some embodiments, the second housing 2 includes a perforation 21 having a through hole 22 that penetrates the second housing 2, for example... Figure 6 and Figure 7 As shown. The second housing 2 has a cavity 23, with a perforation 21 located around the periphery of the cavity 23. In some embodiments, at least a portion of the first main body 121 is located in the cavity 23, and at least a portion of the second main body 122 is located in the cavity 23. For example... Figure 4 As shown, both the first main body 121 and the second main body 122 are located in the cavity 23.

[0033] The first main body 121 has an opening 1211, and the opening 1211 has an opening 1212 that penetrates through the first main body 121. In some embodiments, the opening 1211 is located in the cavity 23, and there is a gap between the opening 1211 and the perforation 21. The opening 1212 connects the first cavity 131 and the cavity 23, and the perforation 22 connects the cavity 23 to the outside of the detection device, for example... Figure 4 As shown, opening 1212 is connected to the first cavity 131 and also to the container 23. The gas first enters the container 23, exchanges heat with the first detection probe 15 and the second detection probe 16, and then enters the first cavity 131 through opening 1212. The detection environment of the first detection probe 15 and the second detection probe 16 is closer, which is beneficial to improving the gas detection accuracy.

[0034] In some embodiments, along the height direction H of the gas detection probe, the first main body portion 121 and the second main body portion 122 are located on the same side of the perforated portion 21, with a gap between the first main body portion 121 and the perforated portion 21, and a gap between the second main body portion 122 and the perforated portion 21. This allows the gas to more fully exchange heat with both the first detection probe 15 and the second detection probe 16 simultaneously before entering the first chamber 131, making the detection environment areas of the first detection probe 15 and the second detection probe 16 identical. In some embodiments, the opening 1211 has a circular opening 1212.

[0035] In some embodiments, along the height direction H of the gas detection probe, the opening 1211 is located at one end of the first main body 121; the second main body 122 has a closing portion 1221, which corresponds to the opening 1211, and is located at one end of the second main body 122 along the height direction of the gas detection probe. Along the height direction H of the gas detection probe, the opening 1211 is closer to the perforation portion 21 relative to the first detection portion 111; the closing portion 1221 is closer to the perforation portion 21 relative to the second detection portion 112. In some embodiments, the perforation portion 21 is perpendicular to the height direction of the gas detection probe, and along the height direction of the gas detection probe, the distance between the opening 1211 and the perforation portion 21 is equal to the distance between the closing portion 1221 and the perforation portion 21.

[0036] In some embodiments, the first housing 3 includes a through-hole portion 31 with a through-hole 32 penetrating through the sidewall of the first housing 3 and connecting the through-hole 22 to the outside of the detection device. The through-hole portion 31 and the through-hole portion 21 are tightly fitted together. In this application, when the two components are tightly fitted together, the two components can directly contact each other, or a third component can be clamped between the two components. The tight fit between the through-hole portion 31 and the through-hole portion 21 can be that the through-hole portion 31 and the through-hole portion 21 are in direct contact, with the through-hole portion 31 tightly wrapping or covering the through-hole portion 21; or, other components, such as a waterproof and breathable membrane, are clamped between the through-hole portion 31 and the through-hole portion 21. Along the height direction H of the gas detection probe, the opening portion 1211 is closer to the through-hole portion 31 relative to the first detection portion 111; the closing portion 1221 is closer to the through-hole portion 31 relative to the second detection portion 112.

[0037] In some embodiments, the first cavity 131 is connected to the cavity 23 through an opening 1212 in the first main body 121. The cavity 23 communicates with a through hole 32 through a perforation 22 in the second housing 2, and the through hole 32 communicates with the outside of the detection device. In other embodiments, the first cavity 131 is directly connected to the through hole 32 through the opening 1212 in the first main body 121, and the through hole 32 communicates with the outside of the detection device. This achieves communication between the first cavity 131 and the outside of the detection device.

[0038] In other embodiments, the through-hole portion 31 is located around the first main body portion 121 and the second main body portion 122, with the first main body portion 121 and the through-hole portion 31 tightly fitted together, and the second main body portion 122 and the through-hole portion 32 tightly fitted together, for example... Figure 12 As shown. The through hole 32 communicates with the opening 1212. At least a portion of the second main body 122 aligns with the through hole 32, and at least a portion of the second main body 122 is in contact with the external gaseous environment of the detection device, for example... Figures 10-12As shown, gas from outside the detection device can contact at least a portion of the second main body 122 through the through hole 32. Thus, gas flowing from outside the detection device into the through hole 32 flows directly into the opening 1212, and then from the opening 1212 into the first cavity 131, contacting the first detection part 111. This shortens the gas flow path, reducing the response time of the gas detection probe and improving its detection sensitivity. Although the second cavity 132 is not connected to the outside of the detection device, at least a portion of the second main body 122 is aligned with the through hole 32, allowing gas from outside the detection device to contact at least a portion of the second main body 122 through the through hole 32. This makes the heat transfer between the outside of the detection device and the first main body 121 nearly equal to the heat transfer between the outside of the detection device and the second main body 122. In other words, the outside of the detection device exerts the same thermal influence on the first detection probe 15 and the second detection probe 16, making the detection environments of the first detection probe 15 and the second detection probe 16 more similar, thus making the detection by the gas detection probe 1 more accurate.

[0039] To reduce the ingress of external liquids into the first cavity 131 and its impact on the detection of the first detection unit 111, the communication between the first cavity 131 and the outside of the detection device is a gaseous communication. In some embodiments, the communication between the first cavity 131 and the opening 1212 is a first communication, the communication between the opening 1212 and the cavity 23 is a second communication, the communication between the cavity 23 and the perforation 22 is a third communication, the communication between the perforation 22 and the through hole 32 is a fourth communication, and the communication between the through hole 32 and the outside of the detection device is a fifth communication, wherein at least one of the first, second, third, fourth, and fifth communications is a gaseous communication.

[0040] Gas communication between the first cavity 131 and the outside of the detection device can be achieved through a waterproof and breathable membrane 4. In some embodiments, the detection device further includes a waterproof and breathable membrane 4, with at least one of the opening 1212, the perforation 21, and the through hole 31 connected to the waterproof and breathable membrane 4, and the waterproof and breathable membrane 4 covering at least one of the opening 1212, the perforation 22, and the through hole 32, for example... Figure 2 and Figure 4 ,or Figure 9 , Figure 11 and Figure 12As shown. It can be understood that when the waterproof and breathable membrane 4 completely covers at least one of the opening 1212, the perforation 22, and the through hole 32, the entry of external liquid into the first cavity 131 can be minimized. Taking the waterproof and breathable membrane 4 covering the opening 1212 as an example, the opening 1211 has an inner wall 1213, which is located outside the opening 1212. When the waterproof and breathable membrane 4 completely covers the opening 1212, along the height direction H of the gas detection probe 1, the projection of the inner wall 1213 on the waterproof and breathable membrane 4 is within the outer contour of the waterproof and breathable membrane 4. Similarly, the perforation 21 has an inner wall 220, which is located outside the perforation 22. When the waterproof and breathable membrane 4 completely covers the perforation 22, along the height direction H of the gas detection probe 1, the projection of the inner wall 220 on the waterproof and breathable membrane 4 is within the outer contour of the waterproof and breathable membrane 4. Similarly, the through hole portion 31 has an inner wall 320, which is located around the through hole 32. When the waterproof and breathable membrane 4 fully covers the through hole 32, the projection of the inner wall 320 on the waterproof and breathable membrane 4 along the height direction H of the gas detection probe 1 is within the outer contour of the waterproof and breathable membrane 4.

[0041] In some embodiments, the waterproof and breathable membrane 4 is sandwiched between the perforated portion 21 and the through-hole portion 31, for example... Figure 4 As shown. In this way, the structure of the detection device is more compact, which helps to reduce the size of the detection device, and can shorten the flow path of gas from the through hole 32 to the perforation 22, reduce the response time of gas detection, improve the sensitivity of gas detection, and further reduce the entry of external impurities into the cavity 23.

[0042] In other embodiments, at least a portion of the waterproof and breathable membrane 4 is sandwiched between the opening 1211 and the through-hole 31, and at least a portion of the waterproof and breathable membrane 4 is sandwiched between the second main body 122 and the through-hole 31, for example... Figure 12 As shown.

[0043] In some embodiments, the second housing 2 includes a first wall 24 and a second wall 25. The first wall 24 is connected to the second wall 25, and the second wall 25 circumferentially surrounds the cavity 23. Along the height direction of the gas detection probe, the first wall 24 is located at one end of the second wall 25, and the second wall 25 and the gas detection probe 1 are located on the same side of the first wall 24. Both the first wall 24 and the second wall 25 are provided with perforations 21, for example... Figure 4 As shown. This allows gas to flow within cavity 23, improving the response speed of the gas detection probe. For example... Figure 4As shown, the perforated portion 21 includes a first perforated portion 211 and a second perforated portion 212. The first perforated portion 211 has a first perforation 221 that penetrates the second housing 2. The second perforated portion 212 has a second perforation 222 that penetrates the second housing 2. The first perforated portion 211 is disposed on the first wall 24, and the second perforated portion 212 is disposed on the second wall 25. The through-hole portion 31 includes a first through-hole portion 311 and a second through-hole portion 312. The first through-hole portion 311 has a first through-hole 321 that penetrates the first housing 3. The second through-hole portion 312 has a second through-hole 322 that penetrates the first housing 3. The first through-hole 321 connects the first perforation 221 and the outside of the detection device, and is in gaseous communication with the outside of the detection device. The second through-hole 322 connects the second perforation 222 and the outside of the detection device, and is in gaseous communication with the outside of the detection device.

[0044] In some embodiments, the first through-hole 321 includes a first sub-through-hole 323 and a second sub-through-hole 324. The first sub-through-hole 323 communicates with the opening 1212, and at least a portion of the second main body 122 is aligned with the second sub-through-hole 324. The diameter of the first sub-through-hole 323 is equal to the diameter of the second sub-through-hole 324. Thus, the heat transfer area between the outside of the detection device and the first main body 121 is equal to the heat transfer area between the outside of the detection device and the second main body 122, and the outside of the detection device has the same thermal effect on the first detection probe 15 and the second detection probe 16.

[0045] In some embodiments, along the height direction H of the gas detection probe 1, the first cavity 131 and the first sub-through hole 323 are located on both sides of the waterproof and breathable membrane 4, and the second cavity 132 and the second sub-through hole 324 are located on both sides of the waterproof and breathable membrane 4, respectively. Figure 11 and Figure 12 As shown.

[0046] In some embodiments, both the first sub-through hole 323 and the second sub-through hole 324 are circular holes, for example... Figure 9 As shown. In some embodiments, the first through-hole portion 311 has a first sub-through-hole inner wall 3231 corresponding to the first sub-through-hole 323. The first sub-through-hole inner wall 3231 is located on the periphery of the first sub-through-hole 323. Along the height direction H of the gas detection probe, the first sub-through-hole inner wall 3231 has a projection on at least one of the opening portion 1211 and the perforation portion 21. The projection of the first sub-through-hole inner wall 3231 is located on the periphery of the opening 1212. The diameter of the first sub-through-hole 323 is larger than the diameter of the opening 1212, which facilitates air intake.

[0047] In some embodiments, at least a portion of the first main body portion 121 is located within the perforation 22, and at least a portion of the second main body portion 122 is located within the perforation 22. Specifically, in some embodiments, the opening 1211 is located within the perforation 22, for example, in conjunction with... Figure 12 and Figure 13 As shown; or, the first main body 121 penetrates the perforation 22, and the opening 1211 is located outside the second housing 2; the opening 1212 communicates with the first cavity 131, and the opening 1212 communicates with the through hole 32, which communicates with the outside of the detection device. The sealing part 1221 is located in the perforation 22, the second main body 122 penetrates the perforation 22, and the sealing part 1221 is located outside the second housing 2. For example, combined with Figure 10 and Figure 13 As shown, the opening 1211 is located in the first sub-perforation 223, and the closing part 1221 is located in the second sub-perforation 224.

[0048] In some embodiments, the perforated portion 21 has a perforated inner wall 220, which is located around the perforation 22, and the main body portion is clearance-fitted with the perforated inner wall 220. For example Figure 12 As shown, the first main body 121 is fitted with the inner wall corresponding to the first sub-perforation 223 with a clearance fit, and the second main body 122 is fitted with the inner wall corresponding to the second sub-perforation 224 with a clearance fit.

[0049] In some embodiments, along the height direction H of the gas detection probe, the opening 1211 is flush with the perforation 21, and the closing portion 1221 is flush with the perforation 21. The first wall 24 includes a first surface 241, through which the perforation 22 penetrates. Along the height direction H of the second housing 2, the first surface 241 is closer to the first housing 3 relative to other portions of the perforation 21, for example... Figure 13 and Figure 15 As shown. In some embodiments, the waterproof and breathable membrane 4 is sandwiched between the first surface 241 and the first housing 3. The opening 1211 is flush with the first surface 241, and the closing portion 1221 is flush with the first surface 241, for example... Figure 10 As shown.

[0050] In some embodiments, the first main body 121 includes an inner wall 1213 corresponding to the opening 1212, and the inner wall 1213 is located around the opening 1212. Along the height direction of the gas detection probe, the projection of the inner wall 3231 of the first sub-through hole on the waterproof and breathable membrane 4 is located around the projection of the inner wall 1213 of the opening on the waterproof and breathable membrane 4.

[0051] In some embodiments, the first wall 24 is flat and perpendicular to the height direction of the gas detection probe; the second wall 25 is annular and parallel to the height direction of the gas detection probe, for example... Figure 6 and Figure 7 ,or Figures 13-15 As shown.

[0052] In some embodiments, the waterproof and breathable membrane 4 includes a first waterproof and breathable membrane 41 and a second waterproof and breathable membrane 42, for example... Figure 2 and Figure 4 As shown. A first waterproof and breathable membrane 41 is sandwiched between a first wall 24 and a first housing 3. The first wall 24 includes a first perforation inner wall 2211 corresponding to the first perforation 221. The first perforation inner wall 2211 is located around the first perforation 221. Along the height direction H of the second housing 2, the projection of the first perforation inner wall 2211 onto the first waterproof and breathable membrane 41 is within the outer contour of the first waterproof and breathable membrane 41. The first housing 3 includes a first through-hole inner wall 3211 corresponding to the first through-hole 321. The first through-hole inner wall 3211 is located around the first through-hole 321. Along the height direction of the second housing 2, the projection of the first through-hole inner wall 3211 onto the first waterproof and breathable membrane 41 is located around the first waterproof and breathable membrane 41. Thus, the first perforation 221 can communicate with the external gaseous environment of the detection device through the first through-hole 321. A second waterproof and breathable membrane 42 is sandwiched between a second wall 25 and a first housing 3. The second wall 25 includes a second perforation inner wall 2221 corresponding to the second perforation 222. Along the length direction L of the second housing 2, the projection of the second perforation inner wall 2221 on the second waterproof and breathable membrane 42 is located within the outer contour of the second waterproof and breathable membrane 42. The first housing 3 includes a second through hole 3221 corresponding to the second through hole 322. Along the length direction of the second housing 2, the projection of the second through hole 3221 on the second waterproof and breathable membrane 42 is located within the outer contour of the second waterproof and breathable membrane 42. Thus, the second perforation 222 can communicate with the external gas of the detection device through the second through hole 322.

[0053] In some embodiments, the perforated portion 21 has a plurality of perforations 22 arranged in at least one row along the width direction W or length direction L of the second housing 2, for example... Figure 6As shown. The through-hole portion 31 has a plurality of through holes 32, which are arranged in at least one row along the width or length direction of the second housing 2. In some embodiments, the perforations 22 correspond one-to-one with the through holes 32. In some embodiments, the perforations 22 and the corresponding through holes 32 are coaxial. In some embodiments, the plurality of perforations 22 include oblong holes that extend along the width or length direction H of the second housing 2. In some embodiments, the first through-hole portion 211 has a plurality of first through holes 221, which include first oblong holes 2212 and first round holes 2213; the first through-hole portion 311 has a plurality of first through holes 321, which include second oblong holes 3213 and second round holes 3114; at least a portion of the first oblong holes 2212 is aligned with the second oblong holes 3213, and at least a portion of the first round holes 2213 is aligned with the second round holes 3114. The perforation 22 and through hole 32 in this application facilitate air intake.

[0054] In some embodiments, the first perforation 22 is symmetrically arranged with respect to the axis of the first perforation portion 211. For example... Figure 6 As shown, the first perforation 22 is symmetrically arranged with respect to the axis a of the first perforation portion 211. This helps to improve the uniformity of air intake in the cavity 23.

[0055] In some embodiments, the second housing 2 includes a limiting portion 5 that protrudes from the second housing 2 toward the cavity 23, for example... Figure 6 As shown; the limiting part 5 is connected to the gas detection probe for limiting, for example... Figure 4 As shown. This facilitates the positioning and installation of the gas detection probe. In some embodiments, the limiting part 5 protrudes from the second wall 25 of the second housing 2 into the cavity 23, and the limiting part 5 is elongated, extending along the height direction of the gas detection probe. In some embodiments, the second wall 25 has at least two limiting parts 5, which extend along the height direction of the second housing 2, and the at least two limiting parts 5 are arranged along the width or length direction of the second housing 2. In this application, the height direction H of the second housing 2 is in the same direction as the height direction H of the gas detection probe, the width direction W of the second housing 2 is in the same direction as the width direction W of the gas detection probe, and the length direction L of the second housing 2 is in the same direction as the length direction L of the gas detection probe 1. Of course, in other embodiments, the second housing 2 and the gas detection probe 1 can also be fixedly connected.

[0056] In other embodiments, the limiting portion 5 protrudes from the first wall 24 of the second housing 2 into the cavity 23. The limiting portion 5 has a limiting hole 50, which communicates with the through hole 22 and the cavity 23. At least a portion of the main body 12 is located in the limiting hole 50, and the limiting portion 5 is located on the periphery of the main body 12. The limiting portion 5 and the main body 12 are in clearance fit, for example... Figures 11-15As shown. During installation, the limiting part 5 is fitted outside the main body part 12 and can position the main body part 12. In some embodiments, the limiting part 5 is located on the periphery of at least one of the first main body part 121 and the second main body part 122, at least a portion of the first main body part 121 and the second main body part 122 is located in the limiting hole 50, and the limiting part 5 is clearance-fitted with at least one of the first main body part 121 and the second main body part 122.

[0057] In some embodiments, the limiting portion 5 has a ring-shaped structure, for example... Figure 14 As shown. Therefore, the limiting part 5 can play a certain heat insulation role between the first detection probe 15 and the second detection probe 16, reducing the mutual influence caused by heat transfer between the first detection probe 15 and the second detection probe 16, thereby improving the detection accuracy. In some embodiments, the through hole 22 and the limiting hole 50 are coaxial. In some embodiments, the through hole 22 and the limiting hole 50 have the same shape and size. In some embodiments, the diameter of the through hole 22 is equal to the diameter of the limiting hole 50, and the diameter of the through hole 22 is larger than the outer diameter of the main body 11. In some embodiments, the limiting part 5 is fixedly connected to the second wall 25. In this way, the strength of the limiting part 5 can be increased.

[0058] In some embodiments, the first perforation 221 includes a first sub-perforation 223 and a second sub-perforation 224. A first main body portion 121 is at least partially located in the first sub-perforation 223, and a second main body portion 122 is at least partially located in the second sub-perforation 224. The first perforation portion 211 includes a first sub-perforation inner wall 2231 corresponding to the first sub-perforation 223, and a second sub-perforation inner wall 2241 corresponding to the second sub-perforation 224. The first main body portion 121 is clearance-fitted with the first sub-perforation inner wall 2231, and the second main body portion 122 is clearance-fitted with the second sub-perforation inner wall 2241. For example… Figure 13 As shown.

[0059] In some embodiments, the limiting portion 5 includes a first limiting portion 51 and a second limiting portion 52. The first limiting portion 51 has a first limiting hole 501, which communicates with the first sub-through hole 223 and the cavity 23, for example... Figure 13 and Figure 14 As shown; the first limiting part 51 is located on the periphery of the first main body 121, and at least a portion of the first main body 121 is located in the first limiting hole 501, with the first main body 121 and the first limiting part 51 in clearance fit. The second limiting part 52 has a second limiting hole 502, which communicates with the second sub-through hole 224 and the cavity 23. The second limiting part 52 is located on the periphery of the second main body 122, and at least a portion of the second main body 122 is located in the second limiting hole 502, with the second main body 122 and the second limiting part 52 in clearance fit.

[0060] In some embodiments, the gas detection probe includes a mounting bracket 7, for example... Figure 2 and Figure 9 As shown. The mounting bracket 7 includes a main body 71 and an extension 72. The main body 71 is connected to the extension 72. The main body 71 is fixedly connected to or limited by the main body. The connecting part 72 is used for fixedly connecting to or limited by the circuit board 8, for example... Figure 5 As shown. At least a portion of the mounting bracket 7 is located in the cavity 23, for example... Figure 4 and Figure 11 As shown. Mounting bracket 7 enhances the connection between the gas detection probe and the circuit board 8. When mounting bracket 7 includes conductive material, it can also be used for grounding the gas detection probe, thereby reducing static electricity on the surface of the gas detection probe.

[0061] In some embodiments, the body portion 71 has an opening 711 through which the opening passes. At least a portion of the main body portion 12 is located within the opening 711. The main body portion 12 is fixedly connected or limitedly connected to the hole wall corresponding to the opening 711, for example, by interference fit between the main body portion 12 and the hole wall 712 corresponding to the opening 711. In some embodiments, for example, combined with... Figure 4 and Figure 5 As shown, the main body 71 has a first opening 721 and a second opening 722. The first main body 121 is fixedly connected or limited to the first hole wall 7211 corresponding to the first opening 721, and the second main body 122 is fixedly connected or limited to the second hole wall 7221 corresponding to the second opening 722.

[0062] In some embodiments, the detection device includes a circuit board 8, a gas detection probe 1 fixedly connected to the circuit board 8, and a gap between the second housing 2 and the circuit board 8. This prevents the second housing 2 from contacting the circuit board 8, reducing the impact of the second housing 2 on the circuit board 8 (e.g., for heat dissipation).

[0063] In some embodiments, the circuit board 8 is provided with a first through hole 81 and a second through hole 82, for example... Figure 5 As shown. Connecting portion 72 penetrates through circuit board 8 and is fixedly connected to circuit board 8. At least a portion of connecting portion 72 is located in the first through hole 71. Conductive portion 142 penetrates through circuit board 8 and is fixedly connected to circuit board 8. At least a portion of conductive portion 142 is located in the second through hole 82.

[0064] In some embodiments, the second housing 2 has a positioning part 6, which is disposed away from the limiting part 5, or the positioning part 6 is connected to the limiting part 5; the positioning part 6 protrudes from the second housing 2 into the cavity 23, for example... Figure 7As shown. Along the height direction H of the second housing, the perforation 21 and the mounting bracket 7 are located on both sides of the positioning part 6, so that the positioning part 6 can be used to limit the distance between the gas detection probe 1 and the perforation 21. In some embodiments, the limiting part 5 has a free end 53, which is located in the cavity 23 and abuts against the mounting bracket 7, for example, against the body part 71 of the mounting bracket 7. Figure 11 As shown. The free ends 53 of the positioning part 6 and the limiting part 5 help to limit the distance between the second housing 2 and the circuit board 8. In some other embodiments, the gas detection probe does not include the mounting bracket 7, and the free ends 53 of the positioning part 6 or the limiting part 5 can directly abut against the main body.

[0065] In some embodiments, the second housing 2 has a receiving groove 27, and at least a portion of the mounting bracket 7 is located in the receiving groove 27. This reduces interference between the mounting bracket 7 and the second housing 2.

[0066] In some embodiments, the detection module includes at least one of a temperature detection module 101, a humidity detection module 102, and a gas pressure detection module 103, for example... Figure 2 As shown. At least one of the temperature detection module 101, humidity detection module 102, and gas pressure detection module 103 is fixedly connected to the circuit board 8, and at least one of the temperature detection module 101, humidity detection module 102, and gas pressure detection module 103 is electrically connected to the circuit board 8. The temperature detection module 101 can detect the ambient temperature outside the detection device, the humidity detection module 102 can detect the ambient humidity outside the detection device, and the gas pressure detection module 103 can detect the gas pressure. Thus, the detection device can also detect at least one of temperature, humidity, and gas pressure. At least one of the temperature detection module 101, humidity detection module 102, and gas pressure detection module 103 is located inside the second housing 2, at least one of the temperature detection module 101, humidity detection module 102, and gas pressure detection module 103 is located inside the cavity 23, and at least one of the temperature detection module 101, humidity detection module 102, and gas pressure detection module 103 is located inside the first housing 3.

[0067] In some embodiments, at least one of the temperature detection module 101, humidity detection module 102, and gas pressure detection module 103 is located in the same cavity 23 as the gas detection probe, for example... Figure 4 As shown. It has a similar detection environment to the gas detection probe, and can use the detection results of the temperature detection module 101, humidity detection module 102 and gas pressure detection module 103 to more accurately compensate for the detection results of the gas detection probe.

[0068] In some embodiments, the cavity 23 of the second housing 2 includes a first cavity 231 and a second cavity 232, the second cavity 232 being in gaseous communication with the external environment of the detection device. At least a portion of the main body of the gas detection probe is located in the first cavity 231, and at least a portion of at least one of the temperature detection module 101, humidity detection module 102, and gas pressure detection module 103 is located in the second cavity 232, for example... Figure 11 As shown. Along the width direction W or length direction L of the second housing 2, the first main body portion 121 is close to the second cavity 232 relative to the second main body portion 122.

[0069] In some embodiments, the second housing 2 further includes a partition portion 26, and along the length or width direction of the second housing 2, the first cavity 231 and the second cavity 232 are respectively located on both sides of the partition portion 26, for example... Figure 11 As shown. For example Figure 14 As shown, both the first limiting hole 501 and the second limiting hole 502 are connected to the first cavity 231. Along the height direction of the gas detection probe, the first cavity 231 is farther away from the perforation portion 21 relative to the first limiting hole 501, and the first cavity 231 is farther away from the perforation portion 21 relative to the second limiting hole 502. A portion of the first main body 121 is located in the first perforation 231, a portion is located in the first limiting hole 501, and the remaining portion is located in the first cavity 231; a portion of the second main body 122 is located in the second perforation 241, a portion is located in the second limiting hole 502, and the remaining portion is located in the first cavity 231. The partition portion 26 divides the cavity 23 into the first cavity 231 and the second cavity 232.

[0070] In some embodiments, the first perforation 221 includes a third sub-perforation 225, which communicates with the second cavity 232; the first through hole 321 includes a third sub-through hole 325, which communicates with the third sub-perforation 225 and the outside of the detection device, for example... Figures 12-14 As shown.

[0071] In some embodiments, both the detection module 100 and the processing module 200 are electrically connected to the circuit board 8, and both are fixedly connected to the circuit board 8. The gas detection probe 1 is electrically connected to and fixedly connected to the circuit board 8. The circuit board 8 is located outside the cavity 23 and inside the first housing 3. The first housing 3 is a single piece, and is fixedly or limitingly connected to at least one of the second housing 2 and the gas detection probe, and is also fixedly or limitingly connected to the circuit board 8. Thus, the first housing 3 can limit the relative displacement between the second housing 2 and the circuit board 8. In some embodiments, along the height direction of the gas detection probe or the second housing 2, the projection of the second housing 2 onto the circuit board 8 is located within the outer contour of the circuit board 8.

[0072] In some embodiments, the first housing 3 includes a first housing portion 33, with a through hole 31 disposed in the first housing portion 33. The first housing portion 33 is located on the periphery of the second housing 2, and at least partially contacts the second housing 2. This helps to reduce the size of the detection device. In some embodiments, the first housing portion 33 tightly wraps around or covers the second housing 2, and the first housing portion 33 and the second housing 2 are tightly fitted together. Figure 4 As shown, a portion of the outer surface of the second housing 2 is in contact with the waterproof and breathable membrane 4, while the remaining portion of the outer surface of the second housing 2 is fitted to the first housing portion 33, i.e., tightly wrapped by the first housing portion 33. For example... Figure 4 As shown.

[0073] In some embodiments, the first housing 3 includes a second housing portion 34 connected to the first housing portion 33, and the second housing portion 34 is in at least partial contact with the circuit board 8. In some embodiments, the second housing portion 34 tightly encloses the circuit board 8 and tightly encloses the processing module disposed on the circuit board 8, and the second housing portion 34 is in close or clearance fit with the circuit board 8 and the processing module disposed on the circuit board 8, for example... Figure 4 As shown.

[0074] The first housing 3 tightly encloses the second housing 2, and the first housing 3 is injection molded around the second housing 2. The first housing 3 is mounted on the circuit board 8, and the first housing 3 is formed by overmolding with the circuit board 8 and the second housing 2 as inserts. Optionally, the second housing 2 is also a monolithic part formed by injection molding.

[0075] In some embodiments, the first housing 3 is a single piece. The first housing 3 encloses the second housing 2, the circuit board 8, and the detection module and processing module fixedly connected to the circuit board 8, forming a single unit. For example, the first housing 3 is formed by low-pressure injection molding. In related technologies, the first housing includes an upper housing and a lower housing. During assembly, the circuit board 8 and the detection module are first placed into the lower housing and fixedly connected to the lower housing. Then, the upper housing is snapped into the lower housing to house the circuit board 8 and the detection module within the upper and lower housings. Since the first housing is not tightly attached to the outer surface of the circuit board 8 and the detection module, the detection device is relatively large, which limits its application, such as when the installation space of the detection device is limited. To meet the miniaturization requirements of the sensing device, low-pressure injection molding technology can be used for encapsulation. This application forms the first housing 3 by low-pressure injection molding. The first housing 3 can be tightly attached to the circuit board 8, the electronic components disposed on the circuit board 8 and located outside the second housing 2, and the second housing 2, thereby reducing the size of the detection device.

[0076] In some embodiments, the manufacturing of the detection device of this application includes the following steps:

[0077] S1. Connect circuit board 8 to gas detection probe 1;

[0078] S2. Provide a second housing 2 to house the gas detection probe 1 inside the second housing 2, and fix or limit the connection between the second housing 2 and the gas detection probe;

[0079] S3. Provide a first housing 3, house the circuit board 8 and the second housing 2 within the first housing 3, fix or limit the connection between the first housing 3 and the second housing 2, and fix or limit the connection between the first housing 3 and the circuit board 8.

[0080] In some embodiments, step S1 further includes the following step: connecting the circuit board 8 to at least one of the temperature detection module 101, humidity detection module 102, and gas pressure detection module 103. Correspondingly, in some embodiments, step S2 further includes the following step: housing at least one of the temperature detection module 101, humidity detection module 102, and gas pressure detection module 103 within the second housing 2.

[0081] In some embodiments, step S3, providing the first housing 3, includes the following steps: forming the first housing 3 by low-pressure injection molding. Specifically, providing the first housing 3 includes the following steps:

[0082] S31. Provide a packaging mold, which has a molding cavity and an injection hole;

[0083] S32. Place the circuit board 8, the gas detection probe, and the second housing 2 into the molding cavity;

[0084] S33. Provide encapsulation material and liquefy the encapsulation material. Inject the liquefied encapsulation material into the molding cavity through the injection hole and solidify the encapsulation material. The encapsulation material forms a first housing 3 that tightly wraps around the second housing 2 and the circuit board 8. The gas detection probe is located inside the second housing 2, and therefore the gas detection probe is also located inside the first housing 3.

[0085] The circuit board 8, detection module, processing module and second housing 2 are packaged in the injection-molded first housing 3, so that the detection device is formed as a whole. This not only reduces the assembly steps of the first housing 3, but also reduces the size of the detection device. Moreover, since the distance between the first housing 3 and the gas detection probe is reduced, the path of external gas into the first cavity 131 of the detection device is shortened, the time response of the detection device is accelerated, that is, the sensitivity is improved.

[0086] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

Claims

1. A detection device, characterized in that: The detection device includes a gas detection probe, a first housing, and a second housing. The gas detection probe includes a detection part and a main body. The detection part includes a thermistor. The main body has an inner cavity. The detection part is located in the inner cavity. There is a gap between the detection part and the main body. At least a portion of the main body is located within the second housing, and the first housing is located around the gas detection probe and the second housing, with both the gas detection probe and the second housing located within the first housing; The gas detection probe includes a first detection probe and a second detection probe; The first detection probe includes a first detection part and a first main body part. The first main body part has a first cavity, which is in gaseous communication with the external environment of the detection device. The first detection part is located in the first cavity. The second detection probe includes a second detection part and a second main body part. The second main body part has a second cavity, which is not in communication with the outside of the detection device. The second detection part is located in the second cavity. At least a portion of the first main body is located within the second housing, and at least a portion of the second main body is located within the second housing; The second housing includes a perforated portion, the perforated portion having a through hole that penetrates the second housing, the second housing having a cavity, and the perforated portion being located on the periphery of the cavity; At least a portion of the first main body portion is located in the cavity, and at least a portion of the second main body portion is located in the cavity; The first main body has an opening that extends through the first main body and is located in the cavity. There is a gap between the opening and the perforation. The opening connects the first cavity and the cavity, and the perforation connects the cavity to the outside of the detection device.

2. The gas detection device as described in claim 1, characterized in that: The detection device includes a detection module and a processing module. The detection module includes the gas detection probe. Both the detection module and the processing module are located inside the first housing, and at least a portion of the processing module is located outside the second housing.

3. The detection device as described in claim 1, characterized in that: The first housing includes a through-hole portion, the through-hole portion having a through hole that penetrates the first housing and connects the through hole to the outside of the detection device; The connection between the first cavity and the opening is a first connection, the connection between the opening and the cavity is a second connection, the connection between the cavity and the perforation is a third connection, the connection between the perforation and the through hole is a fourth connection, and the connection between the through hole and the outside of the detection device is a fifth connection. At least one of the first connection, the second connection, the third connection, the fourth connection and the fifth connection is a gaseous connection.

4. The detection device as described in claim 3, characterized in that: The detection device includes a waterproof and breathable membrane, at least a portion of which is sandwiched between the perforated portion and the through-hole portion.

5. The detection device as described in claim 3, characterized in that: The second housing includes a first wall and a second wall, the first wall being connected to the second wall, and the second wall surrounding the cavity circumferentially; along the height direction of the gas detection probe, the first wall is located at one end of the second wall, and the second wall and the gas detection probe are located on the same side of the first wall; both the first wall and the second wall are provided with perforations.

6. The detection device as described in claim 1, characterized in that: The detection device includes a circuit board, the gas detection probe is connected to the circuit board, and the circuit board is located on the periphery of the cavity; The first housing is a single piece, and the first housing is fixedly connected to the second housing and the circuit board. The first housing tightly wraps around the second housing, and the first housing is injection molded on the periphery of the second housing.

7. The detection device as described in claim 6, characterized in that: The first housing includes a first housing portion and a second housing portion, wherein the first housing portion is connected to the second housing portion; The first housing portion is located around the periphery of the second housing portion and at least partially contacts the second housing portion; the second housing portion is located around the periphery of the circuit board and at least partially contacts the circuit board. The first housing is mounted on the circuit board, and the first housing is formed by insert injection molding with the circuit board and the second housing as inserts.

8. The detection device as described in claim 1, characterized in that: The detection device includes at least one of a temperature detection module, a humidity detection module, and a pressure detection module, wherein at least one of the temperature detection module, the humidity detection module, and the pressure detection module is located within the second housing.

Images