Sensor assembly and valve device

Abstract

A sensor assembly and valve device, by the shell and connector housing fixed connection, the pressure sensing unit and sealing assembly is located between the bottom of the shell and the inner side wall of the connector housing, the sealing part is pressed between the pressure sensing unit and the shell, the sealing part is in sealing contact with the pressure sensing unit, the sealing part is in sealing contact with the shell, the sealing of the space where the circuit unit is located is realized by a sealing assembly, which ensures reliable sealing performance while the structure is simple.

Description

Technical Field

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

[0002] like Figure 24 As shown, the sensor assembly 100 in the related art includes a pressure sensor element 130, an electronic circuit board 120, and a temperature sensor element 170. The sensor assembly 100 delivers fluid to the surface of the pressure sensor element 130 through an inlet opening 175 of an open, liquid-tight channel, and isolates the temperature sensor 170 and the wire 160 from the fluid through a closed, liquid-tight channel. The wire 160 extends within an elongated tubular element 165 and passes laterally through a hole in the base to connect to the electronic circuit board 120.

[0003] exist Figure 20 In this design, a first sealing ring is provided between the pressure sensor element 130 and the middle plate assembly 140, and a second sealing ring is provided between the middle plate assembly 140 and the base element 150 to prevent the detection fluid from entering the cavity where the electronic circuit board 120 is located. Due to the presence of multiple sealing rings, the sealing reliability is difficult to control. At the same time, the assembly process of the sensor assembly with this structure is complex and the production cost is high. Summary of the Invention

[0004] The purpose of this application is to provide a sensor assembly and valve device with a simple structure and reliable sealing performance.

[0005] To achieve the above object, the application adopts the following technical scheme: a sensor assembly, comprising a shell, a temperature sensing unit, a pressure sensing unit and a circuit unit, the temperature sensing unit and the pressure sensing unit are electrically connected with the circuit unit, the temperature sensing unit comprises a temperature sensing part, the pressure sensing unit comprises a pressure sensing part, the sensor assembly has a detection channel, the temperature sensing part is located in the detection channel, the temperature sensing part can convert the temperature in the detection channel into an electric signal, the pressure sensing part can convert the pressure in the detection channel into an electric signal, the sensor assembly further comprises a sealing assembly, the sealing assembly is located between the shell and the pressure sensing unit, the sensor assembly further comprises a connector, the connector comprises a pin and a connector housing, the pin is electrically connected with the circuit unit, the pin can electrically connect the circuit unit with an external power supply, the pin is injection molded with the connector housing, the shell is fixedly connected with the connector housing, the pressure sensing unit and the sealing assembly are limited between the bottom wall of the shell and the inner side wall of the connector housing, the sealing assembly comprises a sealing part, the sealing part is compressed between the pressure sensing unit and the shell, the sealing part is in sealing contact with the pressure sensing unit, and the sealing part is in sealing contact with the shell.

[0006] The application further discloses a valve device, comprising a valve body and a sensor assembly, the valve body has a fluid channel, the detection channel is communicated with the fluid channel, and the sensor assembly is the above-mentioned sensor assembly.

[0007] The sensor assembly of the application is fixedly connected with the connector housing through the shell, the pressure sensing unit and the sealing assembly are limited between the bottom of the shell and the inner side wall of the connector housing, the sealing part is compressed between the pressure sensing unit and the shell, the sealing part is in sealing contact with the pressure sensing unit, and the sealing part is in sealing contact with the shell, so that the sealing of the space where the circuit unit is located is realized through one sealing assembly, and the sealing performance is reliable while the structure is simple. BRIEF DESCRIPTION OF DRAWINGS

[0008] Figure 1 is a perspective structural schematic view of the sensor assembly of the first embodiment of the application;

[0009] Figure 2 is Figure 1 an exploded structural schematic view of the sensor assembly of the first embodiment of the application;

[0010] Figure 3 is Figure 1 a front structural schematic view of the sensor assembly of the first embodiment of the application;

[0011] Figure 4 is Figure 3 an A-A sectional structural schematic view of the sensor assembly of the first embodiment of the application;

[0012] Figure 5 yes Figure 2 A three-dimensional structural diagram of the middle sealing assembly and the first section assembly from one perspective;

[0013] Figure 6 yes Figure 2 A three-dimensional structural diagram of the middle sealing assembly and the first section assembly from another perspective;

[0014] Figure 7 yes Figure 5 A top-view structural diagram;

[0015] Figure 8 yes Figure 7 A schematic diagram of the AA cross-sectional structure in the diagram;

[0016] Figure 9 yes Figure 2 A three-dimensional structural diagram of the combination of the middle base and the second section from one perspective;

[0017] Figure 10 yes Figure 2 A three-dimensional structural diagram of a connector;

[0018] Figure 11 This is a cross-sectional structural schematic diagram of the sensor assembly according to the second embodiment of this application;

[0019] Figure 12 yes Figure 11 A three-dimensional structural diagram of the central base from one perspective;

[0020] Figure 13 yes Figure 11 Enlarged schematic diagram of a portion of the structure of part A of the central base;

[0021] Figure 14 This is a cross-sectional structural schematic diagram of the first embodiment of the pressure sensing unit of this application;

[0022] Figure 15 This is a cross-sectional structural schematic diagram of the sensor assembly according to the third embodiment of this application;

[0023] Figure 16 yes Figure 15 A three-dimensional structural diagram of the central base from one perspective;

[0024] Figure 17 yes Figure 16 A schematic diagram of the structure of the central base from below;

[0025] Figure 18 yes Figure 17 A schematic diagram of the AA cross-sectional structure in the diagram;

[0026] Figure 19 is a sectional structure schematic diagram of a second embodiment of the pressure sensing unit of the present application;

[0027] Figure 20 is a sectional structure schematic diagram of a sensor assembly of a fourth embodiment of the present application;

[0028] Figure 21 is an exploded structure schematic diagram of a sensor assembly of a fifth embodiment of the present application;

[0029] Figure 22 is a sectional structure schematic diagram of a sensor assembly of a fifth embodiment of the present application;

[0030] Figure 23 is a sectional structure schematic diagram of a sensor assembly of a fifth embodiment of the present application; Figure 22 is a partial enlarged structure schematic diagram of part B in

[0031] Figure 24 is a structure schematic diagram of an embodiment of a sensor assembly of the prior art. DETAILED DESCRIPTION

[0032] The present application will be further described below in conjunction with the accompanying drawings and specific embodiments:

[0033] It should be understood that the use of the terms, such as "first", "second", and the like, in the description and claims of the present application does not denote any order, quantity, or importance, but is merely used to distinguish a characteristic from another characteristic. Similarly, the use of the terms, such as "one" or "a" or the like, does not denote a quantity of one, but rather denotes the existence of at least one. Unless otherwise indicated, the terms "front", "back", "left", "right", "up", "down", and the like in the present application are used for the purpose of explanation only and are not intended to limit the particular position or spatial orientation of the present application. The terms "include" or "contain" or the like are open-ended terms that are intended to mean that the elements listed after the "include" or "contain" are encompassed by the elements listed before the "include" or "contain", and that other elements can also be included. If "several" appears in the present application, it means two or more.

[0034] Referring to Figures 1 to 16 , the sensor assembly 100 provided by the present application comprises a pressure sensing unit 1, a temperature sensing unit 2, a circuit unit 4, a connector 5, a sealing assembly 6, and a housing 9. The circuit unit 4 is located on one side of the pressure sensing unit 1, the sealing assembly 6 is located on the other side of the pressure sensing unit 1, and the temperature sensing unit 2 is located between the pressure sensing unit 1 and the sealing assembly 6. Figures 1 to 10In this assembly, circuit unit 4 is located above pressure sensing unit 1, sealing assembly 6 is located below pressure sensing unit 1, temperature sensing unit 2 and pressure sensing unit 2 are both electrically connected to circuit unit 4, housing 9 and connector 5 are fixedly connected to form receiving cavity 59, pressure sensing unit 1 and circuit unit 4 are located in receiving cavity 59, and sensor assembly 100 has detection channel 101; temperature sensing unit 2 includes temperature sensing part 21, at least part of temperature sensing part 21 is located in detection channel 101, temperature sensing part 21 can convert the temperature in detection channel 101 into an electrical signal, temperature sensing part 21 can be a thermistor, the type of temperature sensing part 21 in this application is not limited to this; pressure sensing unit 1 includes pressure sensing part 20 and body part 10, body part 10 can be a ceramic substrate, pressure sensing part 20... The pressure sensing unit 20 is connected to the main body 10. The pressure sensing unit 20 can convert the pressure in the detection channel 101 into an electrical signal. The receiving cavity 59 includes an electronic control cavity 591. The circuit unit 4 is located in the electronic control cavity 591 and is isolated from the detection channel 101. In this embodiment, the sealing component 6 is located between the outer shell 9 and the pressure sensing unit 1. The sealing component 6 includes a sealing part 61. The sealing part 61 is pressed between the pressure sensing unit 1 and the outer shell 9. The sealing part 61 is in sealing contact with the pressure sensing unit 1 and the outer shell 9, so that the working medium of the detection channel 101 cannot enter the electronic control cavity 591. The sealing of the space where the circuit unit is located is achieved by a sealing component, so that the circuit unit will not come into contact with the measured working medium, ensuring reliable sealing performance while keeping the structure simple.

[0035] The temperature sensing unit 2 also includes a conductive part 22 and a base 3. The conductive part 22 is electrically connected to the temperature sensing part 21 and the circuit unit 4. At least a portion of the conductive part 22 is injection molded to the base 3. At least a portion of the sealing part 61 is located between the base 3 and the pressure sensing unit 1.

[0036] See Figures 5 to 8 In this embodiment, the sealing assembly 6 includes a sealing part 61 and a metal skeleton 62. The main material of the sealing part 61 is rubber. The sealing part 61 is injection molded with the metal skeleton 62 as an insert. The metal skeleton 62 is annular. Along the radial direction of the sealing assembly 6, the outer edge of the metal skeleton 62 is aligned with the outer edge of the sealing part 61. Along the height direction of the sealing assembly 6, the sealing part 61 protrudes from the surface of the metal skeleton 62. In this way, after the pressure sensing unit 1 compresses the sealing part 61, it can contact the metal skeleton 62, and the metal skeleton 62 presses the sealing part 61 against the bottom wall of the outer shell 9.

[0037] The sealing assembly 6 has a first through hole 63, the temperature sensing part 21 is electrically connected with the circuit unit 4 through the conductive part 22, the conductive part 22 includes a first section 221, one end of the first section 221 passes through the first through hole 63 and is electrically connected with the circuit unit 4, the other end of the first section 221 is formed with a first flange part 23, the outer diameter of the first flange part 23 is greater than the hole diameter of the first through hole 63, so that a labyrinth structure is formed between the sealing part and the first section of the conductive part, and the sealing performance is improved.

[0038] The conductive part 22 further includes a second section 222 and a third section 223, the second section 222 is located between the first section 221 and the third section 223, and the second section 222 electrically connects the first section 221 and the third section 223. In the embodiment, the second section 222 is injection molded with the base 3, the second section 222 is in elastic contact with and electrically connected with the first section 221, in the embodiment, an arc-shaped protruding part 220 is formed at one end of the second section by bending or stamping, the arc-shaped protruding part 220 has a certain elasticity, the other end of the second section is formed with a flat part 230, the first flange part 23 of the first section 221 abuts against and is electrically connected with the arc-shaped protruding part 220, and the third section 223 is welded and fixed with the flat part 230. A through hole can be formed in the flat part, the third section 223 is inserted into the through hole and then welded and fixed, and the flat part 230 extends into a corresponding area in the inner cavity of the base, so that the insertion end of the third section 223 can be flat, the structure is simple, the third section 223 is fixedly connected with the temperature sensing part 21, and the temperature sensing part 21 is connected at one end of the third section 223.

[0039] In combination with Figure 4 and Figure 9 , part of the second section 222 is injection molded with the base 3, the base 3 has a second flange part 31 and a barrel part 32, the outer edge size of the second flange part 31 is greater than the outer edge size of the barrel part 32, the second flange part 31 protrudes from the barrel part 32, the upper end surface of the second flange part 31 abuts against the lower end surface of the sealing assembly 6, the lower end surface of the second flange part 31 is in contact with the bottom wall of the outer shell 9, and the upper end surface of the sealing assembly 6 abuts against and is sealingly connected with the lower end surface of the pressure sensing unit 1. The barrel part 32 has a notch part 321, the height of the notch part 321 corresponds to the height of the temperature sensing part 21, and the notch part 321 communicates with the inner cavity of the base 3 or the detection channel 101, so that the working medium can enter the detection channel 101 through the notch part 321. In the embodiment, the notch part 321 is four, and is uniformly distributed along the circumference of the barrel part 31; the arc-shaped protruding part 220 and the flat part 230 both protrude from the upper end surface of the second flange part 31, and both are exposed from the upper end surface of the second flange part 31. The barrel part 32 forms a side wall of part of the detection channel 101.

[0040] In combination with Figure 4The shell 9 has a first step portion 91 and a second step portion 92, the first step portion 91 and the second step portion 92 are located at the bottom wall of the shell 9, the first step portion 91 has a first step surface 911, the second step portion 92 has a second step surface 922, the first step surface 911 is closer to the pressure sensing unit 1 than the second step surface 922, the lower end surface of the sealing portion 61 is sealingly connected with the first step surface 911, the first flange portion 23 of the first section 221 can be abutted and limited by the first step surface 911, so as to prevent the first flange portion 23 from being crushed by the arc-shaped protruding portion; the second step portion 92 has a mounting hole 923, the second flange portion 31 is axially limited by the second step surface 922, the second flange portion 32 is transversely limited by the side wall of the second step portion 92, the barrel portion 32 of the base 3 is located in the mounting hole 923, and at least the notch portion 321 is exposed to the shell 9. In the embodiment, the shell 9 further has a third step surface 93, the metal framework 62 is abutted with the third step surface 93, so as to prevent the metal framework 62 from being deformed too much or even being crushed when the metal framework 62 is pressed against the sealing portion 61.

[0041] In combination with reference to Figure 4 and Figure 10 , the connector 5 includes the connector pin 52 and the connector housing 51, the connector pin 52 is electrically connected with the circuit unit 4, the connector pin 52 can electrically connect the circuit unit 4 with an external power supply, the connector pin 52 is injection molded and fixed with the connector housing 51, the shell 9 is fixedly connected with the connector housing 51, in the embodiment, the shell 9 is fixedly connected with the connector housing 51 through riveting, the connector housing 51 includes a limiting portion 511, the limiting portion 511 can be abutted with the upper end surface of the pressure sensing unit 1. In an embodiment, in order to prevent the sealing property of the sensor assembly from being affected due to the deformation of the components caused by temperature change, the limiting portion 511 is not directly abutted with the circuit board on which the circuit unit is located, the limiting portion 511 avoids abutting with the circuit board on which the circuit unit is located and abutting with the pressure sensing unit 1, so that the limiting portion 511 can be a limiting column or an annular portion with a notch, in combination with reference to Figure 10 , the limiting portion 511 is an annular portion with a notch, the shell 9 is fixedly connected with the connector housing 51, the limiting portion 511 is abutted with the pressure sensing unit 1, the lower end surface of the pressure sensing unit 1 is abutted with the upper end of the sealing assembly 6, the lower end surface of the sealing assembly 6 is abutted with the upper end surface of the second flange portion 31 and the first step surface 911 of the shell 9, and the lower end surface of the second flange portion 31 is in contact with the bottom wall of the shell 9, so that the scheme of sealing the circuit unit 4 in the electric control cavity 591 through the fixed connection of the shell 9 and the connector housing 51 is convenient to install, compared with the scheme of needing to install two sealing rings, due to one sealing portion of the present application, the structure is simple, the sealing portion is integrally formed, the materials are the same, the temperature consistency is good, and the sealing reliability is improved.

[0042] Figures 11-13For the second embodiment of the sensor assembly 100, the main difference between the second embodiment and the first embodiment is that the first segment 221 and the second segment 222 of the conductive part 22 are fixedly connected, which can be welding, in the present embodiment. In the embodiment, the second segment 222 is injection molded with the base 3, the second segment 222 has an extension 224 exposed from the base 3, the extension 224 is formed with a first recess 225, the first recess 225 is a blind hole, the end of the first segment 221 extends into the first recess 225 for axial limiting or as an assembly reference for welding the first segment and the second segment, the first segment 221 and the second segment 222 are electrically connected, the outer edge of the extension 224 is larger than the hole diameter of the first through hole 63, the upper end surface of the extension 224 is in sealing contact with the sealing part 61, and the lower end surface of the extension 224 is injection molded with the base 3.

[0043] Figures 15-18 For the third embodiment of the sensor assembly 100, the main difference between the third embodiment and the first embodiment is that the sealing assembly 6 does not include a metal skeleton in the present embodiment, the sealing part has a first through hole 63, the pressure sensing unit 1 has a second through hole 64, the first segment 221 of the conductive part 22 passes through the first through hole 63 of the sealing part and the second through hole 64 of the pressure sensing unit to be mechanically connected with the circuit unit 4 and can be electrically connected, the upper end surface of the first flange part 23 of the first segment 221 abuts against the lower end surface of the sealing part 61, the lower end surface of the first flange part 23 is limitingly connected with the base 3, the second segment 222 includes a vertical segment 226, the vertical segment 226 abuts against and is electrically connected with the first flange part 23, and the pressure sensing unit of the embodiment can also be used for the sensor assembly 100 of the first embodiment. Compared with the first embodiment, the metal skeleton is saved, which is conducive to further reducing the cost. In the present embodiment, the base 3 also includes a limiting ring 33, the upper end surface of the limiting ring 33 has a gap with the lower end surface of the pressure sensing unit 1, the sealing part 61 is annular, and the sealing part 61 is located between the limiting ring 33 and the side wall of the housing 9.

[0044] Referring to Figure 14 and Figure 19 , the pressure sensing unit 1 includes a body part 10 and a pressure sensing part 20, the pressure sensing part 20 is fixedly connected with the body part 10, and the limiting part abuts against the upper end part of the body part.

[0045] In Figure 14In the embodiment, the pressure sensing unit 1 can be a ceramic capacitive sensor. In the embodiment, the pressure sensing unit 1 includes a body portion 10 and a pressure sensing portion 20. The body portion 10 includes a first end portion 11, and the pressure sensing portion 20 includes a second end portion 12. The first end portion 11 and the second end portion 12 are located on opposite sides of the pressure sensing unit 1 in the thickness direction of the pressure sensing unit 1. The circuit unit 4 is located above the first end portion 11. In the embodiment, the circuit unit 4 is located on a circuit board. The circuit board is located above the first end portion 11, and the pressure sensing portion is located at the second end portion 12. The second end portion 12 includes a first region 121 and a second region 122. The first region 121 is a pressure sensing sensitive region, and the second region 122 is located around the outer edge of the first region 121. The first region 121 is exposed to the detection channel and is used to convert the fluid pressure signal into an electrical signal. The body portion 10 has a second groove 113 extending in the thickness direction of the pressure sensing unit 1. The second groove 113 corresponds to the first region 121. The pressure sensing unit 1 further includes a conductive pin. One end of the conductive pin is located in the second groove 113. The conductive pin corresponds to the first region 121 and converts the pressure signal in the detection channel into an electrical signal. The pressure sensing unit 1 further includes a conductive column 14. The conductive column 14 is electrically connected to the first region 121 and the circuit unit 4 and is used to transmit the electrical signal of the first region 121 to the circuit unit 4.

[0046] The above pressure sensor can be used in the Figure 15 In the embodiment, the pressure sensing unit 1 has a second through hole 64. The first segment 221 of the conductive portion 22 passes through the first through hole 63 of the sealing assembly and the second through hole 64 of the pressure sensing unit and is mechanically connected to and can be electrically connected to the circuit unit 4. The upper end surface of the first flange portion of the first segment 221 abuts against and seals the lower end surface of the sealing portion. The pressure sensing unit 1 of the embodiment can also be used in the sensor assembly 100 of the first embodiment, in combination with Figure 4 The lower end surface of the first flange portion 23 of the first segment 221 can elastically abut against and be electrically connected to the arc-shaped protruding portion 220. Of course, the pressure sensing unit of the embodiment can also be used in the sensor assembly 100 of the second embodiment, in combination with Figures 11 to 13 In the embodiment, the second segment 222 is injection molded with the base 3. One end of the second segment 222 has an extension portion 224 that exposes the base. The extension portion 224 is formed with a first groove 225. The first groove 225 is a blind hole. The end of the first segment 221 extends into the first groove 225 and is axially limited or serves as a reference for assembly positioning and connects the first segment 221 and the second segment 222 by welding. The first segment 221 and the second segment 222 are electrically connected. The outer edge of the extension portion 224 is larger than the hole diameter of the first through hole 63, so that the extension portion can cover the first through hole 63. The upper end surface of the extension portion 224 is in sealing contact with the sealing portion 61. The lower end surface of the extension portion 224 is injection molded with the base 3. Figure 19In the embodiment, the pressure sensing unit 1 is a MEMS (Micro Electro Mechanical System) pressure sensor, which is divided into piezoresistive and capacitive types, and is manufactured based on bulk micromachining technology and sacrificial layer technology, respectively. The pressure sensing unit 1 includes a first end portion 11 and a second end portion 12, which are located on opposite sides of the thickness direction of the pressure sensing unit 1. The circuit unit 4 is located above the first end portion 11. The body portion 10 is formed with a third through hole 65. The pressure sensing portion 20 is located on one side of the first end portion 11. The pressure sensing portion 20 can detect the pressure of the fluid in the detection channel through the third through hole 65. The pressure sensor can be used in the sensor assembly 100 of the third embodiment. The pressure sensing unit 1 has a second through hole 64. The first segment 221 of the conductive portion passes through the first through hole 63 of the sealing assembly and the second through hole 64 of the pressure sensing unit, and is mechanically connected and electrically connected with the circuit unit 4. The upper end surface of the first flange portion of the first segment abuts and seals with the lower end surface of the sealing portion. The detection channel 101 communicates with the third through hole. The sensing film of the pressure sensing portion 20 is exposed to the third through hole. Of course, the pressure sensing unit can also be used in the first and second embodiments. The base 3 is formed by inert molding with the second segment 222 of the conductive portion as an injection molding insert, so as to seal and fix the second segment 222 in the base 3.

[0047] Figure 20 For the fourth embodiment of the sensor assembly, the main difference from the third embodiment is that in the embodiment, the conductive portion 22 of the temperature sensing portion further includes an elastic portion 227. The first segment 221 is electrically connected with the circuit unit 4 through the elastic portion 227. In the embodiment, the elastic portion 227 is a spring. The circuit unit 4 is printed on the circuit board 42. The elastic portion 227 abuts between the circuit board 41 and the first segment 221. The circuit board 42 is provided with a solder pad. The first segment 221 is provided with a stepped portion 2211. The elastic portion 227 abuts with the solder pad and the stepped portion 2211. The elastic portion 227 is in a compressed state between the solder pad and the stepped portion. Of course, the elastic portion can be welded with one of the solder pad or the stepped portion, and abut with the other. The second segment 222 is fixedly connected with the first segment 221. The lower end of the first flange portion 23 of the first segment 221 is welded or crimped with the upper end surface of the second segment. The body portion 10 of the pressure sensing unit 1 is a ceramic base. The ceramic base has a second through hole 64. The elastic portion 227 is located in the second through hole 64, which is beneficial to increase the stability of the elastic portion.

[0048] Figures 21-23Fig. 5 is a structural schematic diagram of a fifth embodiment of the sensor assembly; in this embodiment, the sensor assembly 100 includes a housing 9, a temperature sensing unit 2, a pressure sensing unit 1, and a circuit unit 4, the temperature sensing unit 2 and the pressure sensing unit 1 are electrically connected with the circuit unit 4, the temperature sensing unit 2 includes a temperature sensing portion 21, the pressure sensing unit 1 includes a pressure sensing portion 11 and a body portion 10, the body portion 10 is a ceramic substrate, the temperature sensing portion 21 is capable of converting the temperature in the detection channel 101 into an electrical signal, the pressure sensing portion 11 is capable of converting the pressure in the detection channel 101 into an electrical signal, the pressure sensing unit 1 further includes a metal layer 228, the metal layer 228 is sealingly connected with the ceramic substrate, the pressure sensing portion 11 is limitingly connected with the ceramic substrate, the circuit unit 4 is formed on the ceramic substrate, a conductive portion 22 of the temperature sensing unit 2 is electrically connected with the temperature sensing portion 21 and the circuit unit 4, and the conductive portion 22 is welded with the metal layer 228; the circuit unit is directly formed on the ceramic substrate, and a separate circuit board is not needed.

[0049] In this embodiment, the pressure sensing unit is a MEMS pressure sensor, the pressure sensing portion 11 includes a MEMS sensing portion 111 and a transmission portion 112, the MEMS sensing portion 111 is electrically connected with the circuit unit 4 through the transmission portion 112, the ceramic substrate and the metal layer 228 have a second through hole 64, one end of the first segment 221 passes through the second through hole 64 and is electrically connected with the circuit unit 4, the other end of the first segment 221 has a first flange portion 23, the outer diameter of the first flange portion 23 is greater than the hole diameter of the second through hole 64, the upper end surface of the first flange portion 23 is capable of covering the second through hole 64 and is welded with the metal layer 228, and the lower end surface of the first flange portion 23 is electrically connected with the second segment 222. The sensor assembly 100 can be installed on a component having a flow channel, the component can be an electronic expansion valve, which is used for refrigerant flow control in a vehicle air conditioning system to achieve throttling of the refrigerant. The sensor assembly 100 as a temperature and pressure integrated sensor can be used to detect the pressure and temperature of the refrigerant passing through the flow channel. Of course, the component can also be a four-way valve, a heat exchanger, a fluid pipeline thermal management system component, etc., which can measure the pressure and temperature of the refrigerant in the thermal management system component. The same as the third embodiment, details are not repeated here.

[0050] A valve device includes a valve body portion and a sensor assembly 100, the sensor assembly 100 is fixedly installed on the valve body portion, the valve body portion includes a flow channel, the detection channel 101 of the sensor assembly 100 is in communication with the flow channel, the pressure sensing unit 1 is capable of detecting the pressure of the fluid in the flow channel, and the temperature sensing unit 2 is capable of detecting the temperature of the fluid in the flow channel.

[0051] It should be noted that the above examples are only used to illustrate the technical solutions of the present application and not to limit the technical solutions described in the present application. Although the present application has been described in detail with reference to the above examples, those skilled in the art should understand that the skilled in the art can still modify or equivalently replace the present application, and all technical solutions and improvements that do not deviate from the spirit and scope of the present application should be covered in the scope of claims of the present application.

Claims

1. A sensor assembly, comprising a housing, a temperature sensing unit, a pressure sensing unit, and a circuit unit, wherein the temperature sensing unit and the pressure sensing unit are both electrically connected to the circuit unit, the temperature sensing unit includes a temperature sensing element, the pressure sensing unit includes a pressure sensing element, the sensor assembly has a detection channel, the temperature sensing element is located within the detection channel, the temperature sensing element is capable of converting the temperature within the detection channel into an electrical signal, and the pressure sensing element is capable of converting the pressure within the detection channel into an electrical signal, characterized in that: The sensor assembly further includes a sealing assembly located between the housing and the pressure sensing unit; the sensor assembly also includes a connector comprising a pin and a connector housing, the pin being electrically connected to the circuit unit and capable of electrically connecting the circuit unit to an external power source, the pin being injection molded to the connector housing, the housing being fixedly connected to the connector housing, the pressure sensing unit and the sealing assembly being confined between the bottom wall of the housing and the inner sidewall of the connector housing, the sealing assembly comprising a sealing portion pressed between the pressure sensing unit and the housing, the sealing portion being in sealing contact with the pressure sensing unit and the housing; the sealing assembly having a first through hole, the temperature sensing unit comprising a conductive portion, the temperature sensing portion being electrically connected to the circuit unit through the conductive portion, the conductive portion comprising a first segment, one end of the first segment passing through the first through hole and electrically connected to the circuit unit.

2. The sensor assembly according to claim 1, characterized in that: The sealing assembly further includes a metal skeleton, and the sealing part is injection molded with the metal skeleton as an insert. The metal skeleton is annular in shape. Along the radial direction of the sealing assembly, the outer edge of the metal skeleton is aligned with the outer edge of the sealing part. Along the height direction of the sealing assembly, the sealing part protrudes from the surface of the metal skeleton. After a portion of the pressure sensing unit compresses the sealing part, it comes into contact with the metal skeleton, and the metal skeleton presses the sealing part against the bottom wall of the housing.

3. The sensor assembly according to claim 1, characterized in that: The upper end face of the pressure sensing unit abuts against the connector housing, and the lower end face of the pressure sensing unit abuts against the outer shell after compressing the sealing part. The upper end face of the sealing part abuts against and seals the lower end face of the pressure sensing unit, and the lower end face of the sealing part seals against the outer shell.

4. The sensor assembly according to claim 2 or 3, characterized in that: The main material of the sealing part is rubber. A first flange is formed at the other end of the first section. The outer diameter of the first flange is larger than the diameter of the first through hole.

5. The sensor assembly according to claim 4, characterized in that: The temperature sensing unit further includes a base, which is limited and connected to the outer shell. The temperature sensing part is located in the inner cavity formed by the base. The detection channel includes the inner cavity formed by the base. The conductive part includes a second section and a third section. The second section is injection molded and connected to the base. The second section contacts and is electrically connected to the first section. The third section is fixedly connected to the temperature sensing part and welded to the second section. Part of the sealing part is located between the base and the pressure sensing unit.

6. The sensor assembly according to claim 5, characterized in that: The connector housing includes a limiting portion that can abut against the upper end face of the pressure sensing unit. The outer shell is riveted to the connector housing. The base has a second flange portion. The upper end face of the second flange portion abuts against the lower end face of the sealing assembly. The lower end face of the second flange portion contacts the bottom wall of the outer shell. The upper end face of the sealing assembly abuts against the lower end face of the pressure sensing unit.

7. The sensor assembly according to claim 5, characterized in that: The connector housing includes a limiting part, the sensor assembly includes a circuit board, the circuit unit is printed on the circuit board, the limiting part can abut against the upper end surface of the circuit board, the pressure sensing unit includes a body part, the pressure sensing part is fixedly connected to the body part, the lower end surface of the circuit unit abuts against the upper end surface of the body part, the outer shell is riveted to the connector housing, the base has a second flange part, the upper end surface of the second flange part abuts against the lower end surface of the sealing assembly, the lower end surface of the second flange part contacts the bottom wall of the outer shell, and the upper end surface of the sealing assembly abuts against the lower end surface of the body part.

8. The sensor assembly according to claim 6 or 7, characterized in that: The housing has a first stepped portion and a second stepped portion, which are located on the bottom wall of the housing. The first stepped portion has a first stepped surface, and the second stepped portion has a second stepped surface. The first stepped surface is closer to the pressure sensing unit than the second stepped surface. The lower end face of the sealing portion is sealed to the first stepped surface. The second stepped portion has a mounting hole. The second flange portion abuts against the second stepped surface. The second flange portion is limited by the side wall of the second stepped portion. Part of the base is located in the mounting hole.

9. The sensor assembly according to claim 8, characterized in that: The base also includes a limiting ring, the upper end face of which has a gap with the lower end face of the pressure sensing unit, and the sealing part is annular and located between the limiting ring and the side wall of the housing.

10. The sensor assembly according to any one of claims 3, 5-6, characterized in that: The pressure sensing unit includes a ceramic substrate and a metal layer. The metal layer is sealed to the ceramic substrate. The pressure sensing part is limited to the ceramic substrate. The circuit unit is printed on the ceramic substrate. The temperature sensing unit also includes a conductive part. The conductive part is electrically connected to the temperature sensing part and the circuit unit. The conductive part is welded and fixed to the metal layer.

11. The sensor assembly according to claim 4, characterized in that: The pressure sensing unit includes a ceramic substrate and a metal layer. The metal layer is sealed to the ceramic substrate. The pressure sensing part is limited to the ceramic substrate. The circuit unit is printed on the ceramic substrate. The temperature sensing unit also includes a conductive part. The conductive part is electrically connected to the temperature sensing part and the circuit unit. The conductive part is welded and fixed to the metal layer.

12. A valve device comprising a valve body and a sensor assembly, the valve body having a fluid passage, the detection passage being in communication with the fluid passage, and the sensor assembly being the sensor assembly according to any one of claims 1-11.

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