A sensing device

Abstract

This application relates to the field of testing technology, specifically to a sensing device that can meet both testing requirements and the sealing requirements of a circuit board. The sheath body of the sensing device is provided with a receiving portion, allowing electrical connectors to pass through the sheath body, thereby facilitating electrical connection with the circuit board located on the other side of the support. The sheath body and the housing are sealed together, and the position where the electrical connectors pass through the sheath body is also sealed by the sealing portion. The inner cavity of the sheath body and the inner cavity of the housing, which allow the fluid to flow into the sheath body, are not interconnected, and the fluid in the sheath body will not flow into the circuit board. This achieves both testing requirements and sealing requirements.

Description

Technical Field

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

[0002] A typical sensing device includes a detection probe, a wiring harness, and a circuit board. The detection probe comes into contact with the fluid to detect its temperature. The wiring harness connects to the circuit board, which needs to be isolated from the fluid. Therefore, the sensing device also includes a housing with a support base inside. The circuit board is located on one side of the support base, and the detection probe is located on the other side. Simultaneously, the housing is sealed at least partially with potting compound (e.g., silicone sealant) to isolate the circuit board on one side of the support base from the detection probe on the other side, thus meeting both the detection requirements and the circuit board's sealing needs. Summary of the Invention

[0003] The purpose of this application is to provide a sensing device that can meet the detection requirements and the sealing requirements of the circuit board.

[0004] The sensing device provided in this application includes a housing, a support base and a circuit board located inside the housing, the circuit board being supported on one side of the support base along a first direction; the sensing device also includes a sheath assembly and a first detection assembly, the first detection assembly including a detection element and an electrical connector, the electrical connector electrically connecting the detection element and the circuit board, the sheath assembly and the detection element being located on the other side of the support base along the first direction;

[0005] The sheath assembly includes a sheath body, at least a portion of which is located within a housing, and the sheath body and housing are sealed together; at least a portion of the sensing element is located within the sheath body; the sheath body has a receiving portion extending through its interior and exterior; the sheath assembly also includes a sealing portion located within the receiving portion and sealingly engaging with a wall portion corresponding to the receiving portion; a portion of the electrical connector is located within the sealing portion and sealingly engaging with the sealing portion.

[0006] In this application, the sheath body of the sensing device is provided with a receiving portion, which allows the electrical connector to pass through the sheath body, thereby facilitating electrical connection with the circuit board located on the other side of the support. The sheath body and the housing are sealed together, and the position where the electrical connector passes through the sheath body is also sealed by the sealing portion. This ensures that the inner cavity of the sheath body and the inner cavity of the housing, which allow the fluid to flow into the sheath body, are not interconnected. The fluid in the sheath body will not flow into the circuit board, thus meeting the sealing requirements while fulfilling the detection requirements. Attached Figure Description

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

[0008] Figure 2 for Figure 1 A bottom view of the central sensing device;

[0009] Figure 3 for Figure 2 A cross-sectional view of the central sensing device along the AA direction;

[0010] Figure 4 for Figure 3 Enlarged diagram of part B in the middle;

[0011] Figure 5 for Figure 1 A schematic diagram of the structure in which the middle sheath body and the first detection component are assembled together;

[0012] Figure 6 for Figure 1 Schematic diagram of the structure of the inner sheath body;

[0013] Figure 7 for Figure 6 Enlarged schematic diagram of part C in the middle;

[0014] Figure 8 A schematic diagram of another type of sheath body with a receiving part;

[0015] Figure 9 for Figure 5 Enlarged schematic diagram of part D in the middle;

[0016] Figure 10 for Figure 3 Enlarged schematic diagram of part E in the middle;

[0017] Figure 11 for Figure 1 Schematic diagram of the middle support base;

[0018] Figure 12 for Figure 11 A cross-sectional view of the central support along the FF direction;

[0019] Figure 13 This is a schematic diagram of another type of support base;

[0020] Figure 14 for Figure 4 Schematic diagram of the structure of the first sealing ring;

[0021] Figure 15 This is a schematic diagram of the assembly of the sheath assembly and the first detection assembly of the sensing device in another embodiment of this application;

[0022] Figure 16 for Figure 15 Schematic diagram of the middle sheath assembly;

[0023] Figure 17 This is a schematic diagram of another type of sheath body with a receiving section.

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

[0025] 100 - Sensing device;

[0026] 10-Shell; 101-Shell body; 1011-First side wall; 10111-First stepped surface; 10112-Flanged edge; 1012-First bottom wall; 10121-Boss; 101a-Mounting hole; 102-Shell cover; 1021-Second stepped surface; 10a-Cavity; 10b-Second gap;

[0027] 20-Sheath assembly; 201-Sheath body; 2011-Wall portion; 2011a-Groove; 2012-Stepped wall portion; 2013-Straight wall portion; 2014-First end face; 2015-Limiting structure; 20151-Limiting wall; 201a-Receiving portion; 201b-Notch; 201c-First annular groove; 201d-Second annular groove; 202-Connecting portion; 203-Partition plate; 203a-Limiting hole; 204-Sealing portion; 205-First sealing ring; 206-Second sealing ring;

[0028] 30-First detection component; 301-Detection element; 302-Electrical connector; 3021-First electrical connection segment; 3022-Second electrical connection segment; 3023-Third electrical connection segment; 3024-Fourth electrical connection segment;

[0029] 40-Support base; 401-Second side wall portion; 401a-Hole structure; 401a1-First gap; 401b-Groove structure; 401c-Limiting cavity; 402-Second bottom wall portion; 402a-Annular groove; 4021-Second end face; 403-Extension portion; 40a-Second channel;

[0030] 50 - Sealing ring;

[0031] 60 - Circuit board assembly; 601 - Base; 601a - First channel; 602 - Circuit board;

[0032] 70 - Conductive components;

[0033] 80 - Second detection component. 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. In the embodiments of this application, the terms "first," "second," etc., are only used to distinguish the same or similar structural features, and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features.

[0035] Please refer to Figures 1 to 3 , Figure 1This is an exploded schematic diagram of the sensing device 100 in one embodiment of this application; Figure 2 for Figure 1 Bottom view of the sensor 100; Figure 3 for Figure 2 A cross-sectional view of the central sensing device 100 along the AA direction.

[0036] The sensing device 100 in this embodiment includes a housing 10. Specifically, the housing 10 includes a housing body 101 and a housing cover 102, with the housing cover 102 sealing the housing body 101. Figure 3 In the shell body 101, there are a top and a first bottom wall portion 1012 distributed along a first direction. The top has an opening. A portion of the shell cover 102 is inserted into the shell body 101. The shell body 101 has a first side wall portion 1011. A first stepped surface 10111 is provided on the inner side of the first side wall portion 1011. The lower end face of the shell cover 102 abuts against the first stepped surface 10111 along the first direction. The first direction is also... Figure 3 In the schematic vertical direction, the upper end of the first side wall portion 1011 of the shell body 101 also has a flange 10112, and the shell cover 102 has an upward-facing second stepped surface 1021. The flange 10112 abuts against the second stepped surface 1021, thus limiting the fit between the shell cover 102 and the shell body 101. Of course, the shell 10 can also have other structural forms, such as the shell cover 102 being a flat structure, or the shell 10 being two half-shells joined together. This embodiment does not limit this, as long as the two enclose the inner cavity of the shell 10 to accommodate other components of the sensing device 100.

[0037] You can continue to refer to this. Figure 3 The sensing device 100 in this embodiment also includes a support base 40 and a circuit board assembly 60, the circuit board assembly 60 being supported on one side of the support base 40 along the first direction. Figure 3 The circuit board assembly 60 in this embodiment includes a circuit board 602 and a base 601. The circuit board 602 is supported on the base 601, and the base 601 is supported on the support 40.

[0038] In addition, the sensing device 100 also includes a first detection component 30, which includes a detection element 301 and an electrical connector 302. In this embodiment, the detection element 301 is specifically used to detect the temperature of the fluid and can be a temperature probe. The detection element 301 needs to be in contact with the fluid. The electrical connector 302 electrically connects the detection element 301 and the circuit board 602 to transmit the signal detected by the detection element 301 to the circuit board 602, and then the circuit board 602 transmits it to the outside. In this embodiment, the sensing device 100 also includes a sheath assembly 20. The sheath assembly 20 and the detection element 301 are both located on the other side of the support base 40 along the first direction. Figure 3Located below the support base 40, the sheath assembly 20 and the detection element 301 of the first detection assembly 30 are assembled into a component structure, which is located on different sides of the support base 40 along with the circuit board 602.

[0039] In detail, the sensing device 100 may further include a conductive element 70. A portion of the conductive element 70 is located outside the housing cover 102, and a portion passes through the housing cover 102 and is located inside the housing 10. In this way, the conductive element 70 can be electrically connected to the circuit board 602 to transmit signals to the outside. In this embodiment, the sensing device 100 can be installed in the valve device of an air conditioning system, for example. The signals such as temperature detected by the detection element 301 can be transmitted to the control module of the valve device through the circuit board 602 and the conductive element 70, thereby facilitating the control of parameters such as the flow rate of the valve device. Of course, the sensing device 100 can also be applied to other devices, and this embodiment does not limit this application.

[0040] Can be combined Figure 4 understand, Figure 4 for Figure 3 Enlarged diagram of part B in the middle.

[0041] The sheath assembly 20 in this embodiment includes a sheath body 201, which is a cylindrical structure. At least a portion of the sheath body 201 is located inside the housing 10. Figure 4 In this embodiment, the first bottom wall portion 1012 of the housing 10 has a mounting hole 101a. A sheath body 201 passes through the mounting hole 101a. A portion of the sheath body 201 is located within the inner cavity of the housing 10, a portion is located within the mounting hole 101a, and a portion is located outside the mounting hole 101a. At least a portion of the detection element 301 is located within the sheath body 201. The sheath body 201 can protect the detection element 301. Fluid entering the inner cavity of the sheath body 201 can also contact the detection element 301 for detection. In this embodiment, a portion of the detection element 301 can be located outside the sheath body 201, that is, extending outward from the sheath body 201 in a direction away from the housing 10, so as to contact the fluid for detection. Figure 4 As shown, the portion of the sheath body 201 located outside the mounting hole 101a may be provided with a notch 201b to facilitate contact between the detection element 301 and the fluid.

[0042] Furthermore, the sensing device 100 in this embodiment also includes a second detection component 80, which is, for example, the first detection component, capable of detecting pressure. The second detection component 80 can be supported on the circuit board 602, such as... Figure 1As shown, the base 601 of the circuit board assembly 60 is provided with a first channel 601a, and the support 40 is provided with a second channel 40a. The first channel 601a and the second channel 40a are connected, and the second channel 40a is connected to the inner cavity of the sheath body 201. In this way, the fluid can also come into contact with the detection element of the second detection assembly 80 after passing through the sheath body 201, the second channel 40a, and the first channel 601a, thereby detecting the pressure of the fluid. That is, the inner cavity of the sheath body 201 can also serve as a channel for delivering fluid to the second detection assembly 80. In other words, the sensing device 100 in this embodiment is specifically a temperature and pressure sensing structure. However, it is known that the sensing device 100 can also be provided with only the first detection assembly 30 to detect one parameter of the fluid. In this case, the base 601 does not need to be provided with the first channel 601a, and the second detection assembly 80 does not need to be integrated on the circuit board 602.

[0043] In this embodiment, the sheath body 201 and the housing 10 are sealed together, so the inner cavity of the sheath body 201 and the inner cavity of the housing 10 are not in communication. At this time, the wall of the sheath body 201 has a receiving portion 201a that extends through its inside and outside. Here, inside and outside are defined relative to the inner cavity of the sheath body 201; the side closer to the inner cavity is the inside, and vice versa. It is worth noting that the sheath assembly 20 in this embodiment also includes a sealing portion 204. The sealing portion 204 is located inside the receiving portion 201a and is sealed to the wall of the receiving portion 201a. A portion of the electrical connector 302 passes through the sealing portion 204 and is sealed to the sealing portion 204. That is, the sealing portion 204 achieves the sealing between the electrical connector 302 and the sheath body 201. In this way, after the electrical connector 302 passes through the sheath body 201, the fluid in the inner cavity of the sheath body 201 will not flow from the point where the electrical connector 302 passes through to the inner cavity of the housing 10.

[0044] Can continue to combine Figures 5 to 7 understand, Figure 5 for Figure 1 A schematic diagram of the structure in which the middle sheath body 201 and the first detection component 30 are assembled together; Figure 6 for Figure 1 Schematic diagram of the structure of the inner sheath body 201; Figure 7 for Figure 6 Enlarged diagram of part C in the middle.

[0045] In this embodiment, the receiving portion 201a of the sheath body 201 is specifically a through hole portion provided in the wall of the sheath body 201. The sealing portion 204 is located in the receiving portion 201a and cooperates with the wall portion 2011 of the receiving portion 201a. At this time, the wall portion 2011 corresponds to the through hole portion, and the electrical connector 302 passes through the sealing portion 204 and is sealed and cooperates with the sealing portion 204. In this way, during operation, the fluid located in the sheath body 201 will not flow into the inner cavity of the housing 10 from the position where the electrical connector 302 passes through the sheath body 201.

[0046] like Figure 3 As shown, the support base 40 is located inside the housing 10. The support base 40 has a second bottom wall portion 402. The second bottom wall portion 402 of the support base 40, the first bottom wall portion 1012 of the housing body 101, and the sheath body 201 define a chamber 10a. This chamber 10a is part of the inner cavity of the housing 10. Since the sheath body 201, the housing 10, and the support base 40 are all sealed together, this chamber 10a is not in communication with the inner cavity of the sheath body 201. The portion of the electrical connector 302 that protrudes from the sheath body 201 includes a third electrical connection segment 3023, which is located in the chamber 10a. The electrical connector 302 also includes a second electrical connection segment 3022. Figure 5 The first electrical connection segment 3021 (indicated by the dotted line, actually located within the sealing part 204) and the second electrical connection segment 3022 are located within the sealing part 204. The first electrical connection segment 3021 is located within the inner cavity of the sheath body 201 and is electrically connected to the detection element 301. The sheath assembly 20 may include a partition 203 located within the sheath body 201. The partition 203 is provided with a limiting hole 203a. The first electrical connection segment 3021 passes through the limiting hole 203a. In this embodiment, the first detection assembly 20 includes two electrical connectors 302. The first electrical connection segments 3021 of both electrical connectors 302 pass through the limiting hole 203a. The limiting hole 203a can position the electrical connectors 302.

[0047] Therefore, in this embodiment, the sheath body 201 is provided with a receiving portion 201a, which allows the electrical connector 302 to pass through the sheath body 201, thereby facilitating electrical connection with the circuit board 602 located on the other side of the support base 40. The sheath body 201 and the housing 10 are sealed together, and the position where the electrical connector 302 passes through the sheath body 201 is also sealed by the sealing portion 204. Thus, the inner cavity of the sheath body 201 and the inner cavity of the housing 10 are not interconnected, and the fluid in the sheath body 201 will not flow to the circuit board 602. Therefore, it is not necessary to seal the gap between the support base 40 and the housing 10 by potting glue, thereby simplifying the structure and manufacturing process of the entire sensing device 100.

[0048] Furthermore, the sealing part 204 in this embodiment can be an injection-molded structure, specifically an injection-molded structure with the electrical connector 302 and the sheath body 201 as inserts. That is, the electrical connector 302 is inserted into the receiving part 201a, and the portion located within the receiving part 201a is the second electrical connection segment 3022. Then, injection molding material is injected into the injection mold. After the injection molding material fills and solidifies within the receiving part 201a, it forms the sealing part 204. The sealing part 204 encloses the second electrical connection segment 3022, achieving a sealed fit with the electrical connector 302. Simultaneously, the sealing part 204 is injection-molded into the wall portion 2011 corresponding to the receiving part 201a, thus also achieving a sealed fit. It is evident that forming the sealing part 204 in the form of injection molding results in a more reliable sealing fit between the sealing part 204, the receiving part 201a, and the electrical connector 302, and also provides higher structural strength. In particular, when in operation, fluid flows in the sheath body 201, and the pressure inside the sheath body 201 is relatively high, while no fluid flows through the chamber 10a of the housing 10, and the pressure is relatively low. As a result, the pressure difference between the inner and outer sides of the sealing part 204 is relatively large. The injection-molded sealing part 204 has strong strength, which is conducive to withstanding this pressure difference, thereby further ensuring the longevity of the sealing effect.

[0049] Please continue to refer to this. Figure 8 , Figure 8 This is a schematic diagram of another type of sheath body 201 with a receiving portion 201a.

[0050] Figure 7 The wall portion 2011 corresponding to the receiving portion 201a of the middle sheath body 201 is a straight hole wall, while Figure 8 In the design, the wall portion corresponding to the receiving portion 201a is provided with a groove 2011a. The groove 2011a can be arranged around the receiving portion 201a, thus forming an annular groove. In this way, the outer periphery of the sealing portion 204 formed after injection molding will have a ring of protrusions located in the annular groove 2011a. This increases the contact area with the sheath housing 10, improving the reliability of the injection molding connection. Furthermore, it forms a stop in the inner and outer directions of the sheath body 201, further preventing the sealing portion 204 from detaching from the receiving portion 201a under pressure differential. Of course, during injection molding, the wall portion 2011 corresponding to the receiving portion 201a is not limited to having an annular groove 2011a. For example, multiple grooves 2011a distributed circumferentially along the wall portion 2011 can be provided, resulting in multiple protrusions on the outer periphery of the injection-molded sealing portion 204, which can also achieve the purpose of strengthening the injection molding connection.

[0051] It is understood that the sealing part 204 is not limited to an injection-molded structure. For example, the sealing part 204 can be a rubber block embedded in the receiving part 201a of the sheath body 201. In this case, the sheath body 201 can be integrally provided with a limiting structure, which forms a stop and limit on the sealing part 204 in the inward and outward directions of the receiving part 201a. For example, the wall part 2011 corresponding to the receiving part 201a is also provided with an annular groove 2011a. Part of the sealing part 204 can be embedded in the groove 2011a. Then, the groove sidewall corresponding to the groove 2011a is a limiting structure 2015, which stops the rubber block of the sealing part 204 in the inward and outward directions. It can be seen that the sealing part 204 is embedded in the annular groove 2011a, which on the one hand facilitates reliable compression of the sealing part 204 to enhance the sealing effect, and on the other hand, prevents the sealing part 204 from dislodging from the receiving part 201a when the pressure difference is large, so as to further ensure the sealing effect.

[0052] In some embodiments, the second electrical connection segment 3022 of the electrical connector 302 may include a metal conductor and an insulating film plated on the outer periphery of the metal conductor. Thus, the insulating film and the metal conductor are essentially fixed together, forming an integral structure with no gaps between them. When the second electrical connection segment 3022 is injection molded and encased in the sealing portion 204, the outer side of the insulating film is bonded to the injection molding material, and the inner side of the insulating film is bonded to the second electrical connection segment 3022. This effectively means that the entire second electrical connection segment 3022 and the sealing portion 204 are bonded together, making it less likely for the second electrical connection segment 3022 and the sealing portion 204 to detach, thereby further ensuring the reliability of the sealing fit.

[0053] As previously stated, the electrical connector 302 also includes a first electrical connection segment 3021 and a third electrical connection segment 3023 connected to the second electrical connection segment 3022. The first electrical connection segment 3021 is located in the inner cavity of the sheath body 201, and the third electrical connection segment 3023 is located in the chamber 10a of the housing 10. In this case, at least one of the first electrical connection segment 3021 and the third electrical connection segment 3023 can be configured to include a metal conductor and an insulating sleeve sleeved on the outside of the metal conductor. That is, the first electrical connection segment 3021 and the second electrical connection segment 3022 can be a wire harness structure. The wire harness structure has good deformation capability. In this way, the first electrical connection segment 3021 can adapt to extend and bend into the sheath body 201 to be electrically connected to the detection element 301, and the third electrical connection segment 3023 can extend and bend within the chamber 10a to be electrically connected to the circuit board 602 located above. Of course, at this time, the insulating sleeves of the first electrical connection segment 3021 and the third electrical connection segment 3023 and the above-mentioned insulating coating need to be connected together. For example, after the insulating sleeve is put on, the metal conductor corresponding to the second electrical connection segment 3022 can be coated to complete the connection with the insulating sleeve at the same time.

[0054] Please continue to combine Figure 5 , 6 and refer to Figure 9 , Figure 9 for Figure 5 Enlarged schematic diagram of part D in the middle.

[0055] In this embodiment, the sheath body 201 is generally cylindrical. The sheath body 201 also includes a straight wall portion 2013 and a stepped wall portion 2012. The port of the receiving portion 201a is located in the straight wall portion 2013, and the inner wall portion of the sheath body 201 corresponding to the other port of the receiving portion 201a is also a straight wall portion 2013. In this way, the injection mold is easier to manufacture. At this time, the stepped wall portion 2012 and the straight wall portion 2013 are connected in the first direction. The stepped wall portion 2012 is closer to the detection element 301 and is located below the straight wall portion 2013. The third electrical connection segment 3023 of the electrical connector 302 extending out of the sealing portion 204 is located above the stepped wall portion 2012. When the length of the third electrical connection segment 3023 is long, it can be bent and supported on the stepped wall portion 2012. This is beneficial for supporting the electrical connector 302 and can reduce the force on the sealing portion 204 when the third electrical connection segment 3023 is suspended on the outside of the sheath body 201. That is, the position where the third electrical connection segment 3023 and the second electrical connection segment 3022 meet is the root of the suspension. The third electrical connection segment 3023 is supported, which can reduce the force on the root and better ensure the sealing performance of the second electrical connection segment 3022 and the sealing portion 204. It also helps to reduce the impact on the connection of the fourth electrical connection segment 3024 and the circuit board 602.

[0056] Please combine Figure 3 And continue to refer to Figures 10 to 12 understand, Figure 10 for Figure 3 Enlarged schematic diagram of part E in the middle; Figure 11 for Figure 1 Schematic diagram of the structure of the middle support 40; Figure 12 for Figure 11 A cross-sectional view of the central support 40 along the FF direction.

[0057] In this embodiment, the support base 40 is provided with a through hole structure 401a extending along the first direction. The electrical connector 302 includes a fourth electrical connection segment 3024, which is connected to a third electrical connection segment 3023. A portion of the fourth electrical connection segment 3024 is located within the through hole structure 401a. Figure 3 and Figure 10As shown, the third electrical connection segment 3023 of the electrical connector 302, after exiting the sheath body 201, is located within the chamber 10a. Since the support base 40 is located above the sheath body 201 and the circuit board 602 is located above the support base 40, the electrical connector 302 needs to continue extending in the first direction away from the sheath body 201, i.e., upward, in order to establish a connection with the circuit board 602. Therefore, the electrical connector 302 also includes a fourth electrical connection segment 3024 that connects to the third electrical connection segment 3023 and extends in the first direction. At this time, a hole structure 401a is provided on the support base 40, so that the fourth electrical connection segment 3024 can be located within the hole structure 401a. The hole structure 401a is used to avoid the fourth electrical connection segment 3024.

[0058] At this time, the fourth electrical connection segment 3024 and the hole structure 401a can also have a first gap 401a1 in the direction perpendicular to the first direction, and the width d of the first gap 401a1 is as follows: Figure 10 As shown. That is, the fourth electrical connection segment 3024 and the support base 40 do not need to contact each other. In this embodiment, the sensing device 100 is used to detect the system fluid temperature. When the system pressure is high, both the housing 10 and the support base 40 need to have high pressure resistance. Therefore, both the housing 10 and the support base 40 are made of metal. When the fourth electrical connection segment 3024 passes through the hole structure 401a, it needs to be insulated from the hole structure 401a. Since the sheath body 201 and the inner cavity of the housing 10 are not connected in this embodiment, the fourth electrical connection segment 3024 will not be exposed in the fluid. The outer periphery of the fourth electrical connection segment 3024 only needs to be an insulating structure, and at the same time, there is a first gap 401a1 between it and the hole structure 401a, making leakage even less likely. The fourth electrical connection segment 3024 may include a metal conductor and an insulating coating wrapped around the outer periphery of the metal conductor, or it may include a metal conductor and an insulating sleeve fitted around the outer periphery of the metal conductor, i.e., it may also be a wire harness structure.

[0059] In addition, such as Figure 10 As shown, the housing 10 has a first sidewall portion 1011, and the support base 40 has a second sidewall portion 401. A second gap 10b exists between the first sidewall portion 1011 and the support base 40. Similarly, since fluid will not enter the inner cavity of the housing 10, the second gap 10b does not need to be sealed with potting compound. Moreover, because potting compound is not required, the second gap 10b can be set to be smaller, smaller than the first gap 401a1, just enough to meet the thermal expansion coefficient requirements between the housing 10 and the support base 40. The smaller second gap 10b allows for a clearance fit between the housing 10 and the support base 40, resulting in better limiting effect of the housing 10 on the support base 40 during assembly and use, and better ensuring the support stability of the support base 40 for components such as the circuit board 602.

[0060] like Figure 12As shown, in this embodiment, the second sidewall portion 401 and the second bottom wall portion 402 of the support base 40 enclose a limiting cavity 401c. At least a portion of the base 601 of the circuit board assembly 60 can be embedded into the limiting cavity 401c, thereby supporting and limiting the circuit board assembly 60. As before, fluid needs to flow through the second channel 40a to the first channel 601a of the base 601. Therefore, to prevent fluid from flowing from the gap between the base 601 and the support base 40 into the inner cavity of the housing 10, a sealing ring 50 is also provided between the support base 40 and the base 601. Specifically, the second bottom wall portion 402 can be provided with an annular groove 402a. A portion of the sealing ring 50 is embedded in the annular groove 402a and compressed between the second bottom wall portion 402 and the base 601.

[0061] like Figure 13 As shown, Figure 13 This is a schematic diagram of another type of support base 40.

[0062] and Figure 12 compared to, Figure 13 The middle support 40 is provided with a groove structure 401b that extends along the first direction, with the groove opening of the groove structure 401b facing the first side wall portion 1011 of the housing 10. At this time, part of the fourth electrical connection section 3024 is located inside the groove structure 401b. The function of the groove structure 401b is the same as that of the hole structure 401a described above, which is to avoid and limit the fourth electrical connection section 3024, and will not be described again.

[0063] Let's look again. Figures 4 to 6 and combined Figure 14 understand, Figure 14 for Figure 4 A schematic diagram of the structure of the first sealing ring 205.

[0064] As previously stated, in this embodiment, the sheath body 201 needs to be sealed to the housing 10. Since the upper end of the sheath body 201 is open to communicate with the second channel 40a of the support base 40, and the sheath body 201 passes through the mounting hole 101a of the housing 10, the sheath body 201 needs to be sealed to both the second hole wall corresponding to the mounting hole 101a and the support base 40. That is, the upper end of the sheath body 201 is sealed to the support base 40 to indirectly achieve a sealed connection with the housing 10. However, to ensure communication between the second channel 40a and the inner cavity of the sheath body 201, the support base 40 can be defined to include an annular wall surrounding the second channel 40a, which is then sealed to the upper end of the sheath body 201. It can be seen that if the support base 40 does not have a second channel 40a communicating with the inner cavity of the sheath body 201, the upper end of the sheath body 201 can have a top cover, thus eliminating the need for a sealed connection with the support base 40.

[0065] For specific sealing methods, please refer to Figure 4In this embodiment, the sheath body 201 has a first end face 2014, specifically the upper end face of the sheath body 201. The support base 40 has a second bottom wall portion 402, which includes a second end face 4021. The annular wall portion includes the second end face 4021, specifically the lower end face of the support base 40. The second end face 4021 is arranged around the second channel 40a. The first end face 2014 and the second end face 4021 are arranged opposite to each other and are sealed together. More specifically, at least one of the first end face 2014 and the second end face 4021 is provided with a first annular groove 201c. Figure 4 The first annular groove 201c is provided in the sheath body 201. The sensing device 100 includes a first sealing ring 205. A portion of the first sealing ring 205 is embedded in the first annular groove 201c. After assembly, the first sealing ring 205 is compressed between the first end face 2014 of the sheath body 201 and the second end face 4021 of the support base 40, thereby sealing the sheath body 201 and the support base 40.

[0066] Figure 4 , 12 In the design, the support base 40 includes a second bottom wall portion 402 and an annular second side wall portion 401 extending upward from the second bottom wall portion 402 along a first direction. The bottom of the second bottom wall portion 402 also has an extension portion 403 extending downward along the first direction. The annular side wall portion includes this extension portion 403. The aforementioned second channel 40a penetrates the second bottom wall portion 402 and the extension portion 403 along the first direction. After assembly, the extension portion 403 can extend into the sheath body 201. The extension portion 403 has multiple notches so that the electrical connector 302 can pass through the notches of the extension portion 403. The extension portion 403 facilitates positioning with the sheath body 201 and also limits the positioning of the electrical connector 302. At this time, the second sealing ring 206 can also be set between the inner side wall of the sheath body 201 and the outer side wall of the extension 403, or sealing rings can be set between the first end face 2014 and the second end face 4021, and between the extension 403 and the sheath body 201, so as to prevent fluid from flowing into the inner cavity of the housing 10 from the gap between the sheath body 201 and the support 40.

[0067] like Figure 6 As shown, the sheath body 201 also includes a connecting portion 202, which extends outward from the top of the sheath body 201 and connects to... Figure 4 It is understood that the first bottom wall portion 1012 of the housing 10 has an upwardly extending boss 10121, and the mounting hole 101a passes through the boss 10121. After assembly, the connecting portion 202 is supported on the boss 10121 of the first bottom wall portion 1012 of the housing 10, which helps to reserve sufficient height of the cavity 10a to accommodate the third electrical connection section 3023.

[0068] Let's look again. Figure 4 Understand the direct sealing method between the housing 10 and the sheath body 201. The first bottom wall portion 1012 of the housing 10 has a mounting hole 101a and a second hole wall portion corresponding to the mounting hole 101a. The sheath body 201 passes through the mounting hole 101a, and the outer side wall of the sheath body 201 and the second hole wall portion of the housing 10 are sealed together. Specifically, at least one of the outer side wall of the sheath body 201 and the second hole wall portion corresponding to the mounting hole 101a is provided with a second annular groove 201d. Figure 6 The second annular groove 201d is disposed on the sheath body 201, and the sensing device 100 also includes, for example, Figure 4 The second sealing ring 206 shown is partially embedded in the second annular groove 201d. After assembly, the second sealing ring 206 is compressed between the housing 10 and the sheath body 201, and the outer walls of the housing 10 and the sheath body 201 are sealed together by the second sealing ring 206.

[0069] The sealing methods listed above are all examples of sealing connections using sealing rings, but they are not limited to this. For example, the mounting hole 101a can be a threaded hole, and the outer wall of the sheath body 201 can be provided with external threads, which can be threadedly connected to the mounting hole 101a to achieve a seal. Alternatively, sealant can be used for sealing. The extension 403 of the support base 40 and the sheath body 201 can also be sealed by threaded connection, etc., which will not be elaborated further.

[0070] Please continue to refer to this. Figure 15 and Figure 16 , Figure 15 This is a schematic diagram of the assembly of the sheath assembly 20 and the first detection assembly 30 of the sensing device 100 in another embodiment of this application; Figure 16 for Figure 15 The structural schematic diagram of the middle sheath assembly 20 does not show the sealing part 204.

[0071] In this embodiment, the structure of the sensing device 100 is basically the same as that in the above embodiment, except that the receiving portion 201a in this embodiment is not a through hole, but is provided in a notch in the sheath body 201. The notch also penetrates the sheath body 201 in the inward and outward directions. At the same time, the notch also penetrates the top of the sheath body 201, that is, it penetrates the first end face 2014 of the sheath body 201. This type of receiving portion 201a is easy to process, and it is also relatively easy to injection mold the sealing portion 204. However, compared with the above-mentioned through hole receiving portion 201a, when the sealing portion 204 is injection molded, the sealing portion 204 and the sheath body 201 have a larger bonding area and higher strength.

[0072] Similar to the above embodiments, the wall portion corresponding to the notch can also be provided with a groove to enhance the bonding strength of the injection molding, or to facilitate the embedding of an elastic sealing block to achieve a sealing effect, etc.

[0073] Let's look again. Figure 17 , Figure 17 This is a schematic diagram of another type of sheath body 201 with a receiving portion 201a.

[0074] Figure 17 The inner sheath body 201 has limiting walls 20151 on both the inner and outer sides of the receiving portion 201a. The limiting walls 20151 are limiting structures 2015, which can stop and limit the sealing portion 204 inside the receiving portion 201a from the inside and outside directions. The sealing portion 204 can be an elastic sealing block or an injection-molded structure, etc. Of course, a groove can also be provided on the wall corresponding to the receiving portion 201a. When the through hole portion is provided as the receiving portion 201a in the above embodiment, the limiting structure 2015 can also be provided in the same way, which will not be described again.

Claims

1. A sensing device, characterized by The sensor (100) includes a housing (10), a support base (40) and a circuit board (602) located within the housing (10), the circuit board (602) being supported on one side of the support base (40) along a first direction; the sensor (100) also includes a sheath assembly (20) and a first detection assembly (30), the first detection assembly (30) including a detection element (301) and an electrical connector (302), the electrical connector (302) being electrically connected to the detection element (301) and the circuit board (602), the sheath assembly (20) and the detection element (301) being located on the other side of the support base (40) along the first direction; The sheath assembly (20) includes a sheath body (201), at least a portion of which is located within the housing (10), and the sheath body (201) and the housing (10) are sealed together; at least a portion of the detection element (301) is located within the sheath body (201); the sheath body (201) has a receiving portion (201a) extending through its interior and exterior; the sheath assembly (20) further includes a sealing portion (204), which is located within the receiving portion (201a) and is sealed to the wall portion (2011) corresponding to the receiving portion (201a); a portion of the electrical connector (302) is located within the sealing portion (204) and is sealed to the sealing portion (204).

2. The sensing device of claim 1, wherein, The sealing part (204) is an injection-molded structure with the electrical connector (302) and the sheath body (201) as inserts; or, the sealing part (204) is an elastic sealing block.

3. The sensing device of claim 2, wherein, The electrical connector (302) includes a second electrical connection segment (3022), which is located inside the sealing portion (204); the second electrical connection segment (3022) includes a metal electrical conductor and an insulating coating deposited on the outer periphery of the metal electrical conductor; The electrical connector (302) further includes a first electrical connection segment (3021) and a third electrical connection segment (3023) connected to the second electrical connection segment (3022). The first electrical connection segment (3021) is located inside the sheath body (201) and electrically connected to the detection element (301). The third electrical connection segment (3023) is located outside the sheath body (201) and electrically connected to the circuit board (602). At least one of the first electrical connection segment (3021) and the third electrical connection segment (3023) includes a metallic electrical conductor and an insulating sleeve sleeved on the outside of the metallic electrical conductor.

4. The sensing device according to any one of claims 1 to 3, characterized in that, The sheath body (201) has a limiting structure (2015) that stops the sealing part (204) in the inner and outer directions of the sheath body (201).

5. The sensing device according to claim 4, characterized in that, The wall portion (2011) corresponding to the receiving portion (201a) is provided with a groove (2011a), and the limiting structure (2015) includes the groove sidewall of the groove (2011a); And / or, the inner and outer sides of the receiving portion (201a) are provided with limiting walls (20151), and the limiting structure (2015) includes the limiting walls (20151).

6. The sensing device according to any one of claims 1 to 3, characterized in that, The support base (40) is provided with a hole structure (401a) or a groove structure (401b) that extends along the first direction. The electrical connector (302) includes a fourth electrical connection segment (3024) that extends along the first direction. The fourth electrical connection segment (3024) is located in the hole structure (401a) or the groove structure (401b). The fourth electrical connection segment (3024) and the hole structure (401a) or the groove structure (401b) have a first gap (401a1) in a direction perpendicular to the first direction; and / or, the support (40) has a second sidewall portion (402), the housing (10) has a first sidewall portion (1011), the second sidewall portion (402) of the support (40) and the first sidewall portion (1011) of the housing (10) have a second gap (10b) in a direction perpendicular to the first direction, and the width of the second gap (10b) is smaller than the first gap (401a1).

7. The sensing device according to any one of claims 1 to 3, characterized in that, The receiving portion (201a) is a through hole provided in the sheath body (201), or the receiving portion (201a) is a notch provided in the sheath body (201).

8. The sensing device according to any one of claims 1 to 3, characterized in that, The sensing device (100) further includes a second detection component (80) and a base (601). The second detection component (80) and the circuit board (602) are supported on the base (601). The base (601) is supported on the support seat (40). The support seat (40) is provided with a second channel (40a). The base (601) is provided with a first channel (601a). The second channel (40a) is connected to the first channel (601a). The second channel (40a) is connected to the inner cavity of the sheath body (201). The second detection component (80) is used to sense the fluid in the first channel (601a). The support (40) includes an annular wall portion surrounding the second channel (40a), and the sheath body (201) and the annular wall portion of the support (40) are sealed together.

9. The sensing device according to claim 8, characterized in that, The support base (40) includes a second bottom wall portion (402), the second bottom wall portion (402) has a second end face (4021), the annular wall portion includes the second end face (4021), the sheath body (201) has a first end face (2014), the first end face (2014) and the second end face (4021) are disposed opposite to each other, at least one of the first end face (2014) and the second end face (4021) is provided with a first annular groove (201c), the sensing device (100) includes a first sealing ring (205), a portion of the first sealing ring (205) is embedded in the first annular groove (201c). And / or, the support (40) includes a second bottom wall portion (402) and an extension portion (403) extending from the second bottom wall portion (402) toward the sheath body (201), the extension portion (403) being at least partially inserted into the sheath body (201), the annular wall portion including the outer wall of the extension portion (403), the extension portion (403) and the sheath body (201) being threadedly connected or having a sealing ring between them.

10. The sensing device according to claim 9, characterized in that, The housing (10) has a mounting hole (101a) and a second hole wall portion corresponding to the mounting hole (101a), and the sheath body (201) passes through the mounting hole (101a). At least one of the outer wall of the sheath body (201) and the second hole wall is provided with a second annular groove (201d), and the sensing device (100) includes a second sealing ring (206), a portion of which is embedded in the second annular groove (201d); or, the sheath body (201) and the second hole wall are threadedly connected.

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