CN113108828A

CN113108828A - Temperature and pressure sensor assembly

Info

Publication number: CN113108828A
Application number: CN202010446693.2A
Authority: CN
Inventors: 饶欢欢; 万霞; 逯新凯; 郭雨辰; 黄隆重; 黄宁杰
Original assignee: Zhejiang Sanhua Intelligent Controls Co Ltd
Current assignee: Zhejiang Sanhua Intelligent Controls Co Ltd
Priority date: 2020-05-22
Filing date: 2020-05-22
Publication date: 2021-07-13

Abstract

The application provides a temperature and pressure sensor assembly, including circuit module, pressure-sensitive element, base and temperature-sensitive element. The base is provided with a first surface and a second surface which are arranged in a back-to-back mode, the base is provided with a channel, a first port and a second port, the first port is communicated with the channel, the second port is located on the second surface, and the second port is located on the first surface. The pressure sensing element is provided with a third surface and a fourth surface which are arranged oppositely, and the third surface is arranged to face the first surface of the base. The circuit module is located on the fourth surface side of the pressure sensing element. The temperature sensing element comprises a conductive part and a head part which is connected with the conductive part and is used for sensing the temperature of the fluid, and the head part is positioned on the side of the second surface of the base. The conductive part is electrically connected with the circuit module and the head part, wherein the base is formed by injection molding of the conductive part as an injection molding insert, and the base covers at least one part of the conductive part. The application provides a temperature pressure sensor subassembly equipment is simple.

Description

Temperature and pressure sensor assembly

Technical Field

The application relates to the technical field of sensors, in particular to a temperature and pressure sensor assembly.

Background

As shown in fig. 1, the sensor assembly 100 of the related art includes a rectangular pressure sensor element 130, an electronic circuit 120, and a temperature sensor element 170. The sensor assembly 100 transmits fluid to the surface of the pressure sensor element 130 sensing pressure through the inlet opening 175 of the open, fluid-tight passageway, and isolates the temperature sensor 170 and the leads 160 from the fluid through the closed, fluid-tight passageway. The wires 160 extend within an elongated tubular member 165 and are connected to the circuit board 120 through holes in the base from the side.

The temperature sensor of the related art is disposed within the closed-end tubular member, and the temperature sensor and its relatively elongated lead wire need to be assembled into the tubular member 165, which is complicated in assembly process and expensive in production cost.

Disclosure of Invention

The application provides a temperature and pressure sensor assembly that detection effect is good, simple structure easily assembles.

In order to achieve the purpose, the following technical scheme is adopted in the application: a temperature and pressure sensor assembly comprises a circuit module, a pressure sensing element, a base and a temperature sensing element, wherein the base is provided with a first surface and a second surface which are arranged in a reverse manner, the base is provided with a channel, a first port and a second port which are communicated with the channel, the first port is positioned on the second surface, the second port is positioned on the first surface, the pressure sensing element is provided with a third surface and a fourth surface which are arranged in a reverse manner, the third surface is arranged facing the first surface of the base, at least part of the area of the third surface forms a pressure sensing area which is used for being in contact with a fluid, the circuit module is positioned on the side of the fourth surface of the pressure sensing element and is electrically connected with the pressure sensing element, the temperature sensing element comprises a conductive part and a head part which is connected with the conductive part and is used for detecting the temperature of the fluid, the head is located on the second surface side of the base, and the conductive part is electrically connected with the circuit module and the head, wherein the base is formed by injection molding of the conductive part serving as an injection molding insert, and covers at least one part of the conductive part.

The application provides a temperature pressure sensor subassembly, the base with the conductive part is for the inserts injection moulding that moulds plastics, and the base cladding conductive part partly at least, is favorable to protecting the conductive part like this, increases the accuracy that the temperature-sensing element detected to be favorable to reducing the equipment degree of difficulty of temperature pressure sensor subassembly, product overall structure is simple.

Drawings

Fig. 1 is a schematic structural view of a temperature and pressure sensor assembly in the related art;

FIG. 2 is a diagram illustrating the use of the temperature and pressure sensor assembly of the present application in a pipeline;

FIG. 3 is a perspective assembly view of the temperature and pressure sensor assembly of the present application;

FIG. 4 is an exploded perspective view of the temperature and pressure sensor assembly of the present application;

FIG. 5 is an exploded perspective view of another angle of the temperature and pressure sensor assembly of the present application;

FIG. 6 is a perspective view of a base in the temperature and pressure sensor assembly of the present application;

FIG. 7 is a top view of FIG. 6;

FIG. 8 is a bottom view of FIG. 6;

FIG. 9 is a sectional view taken along line A-A of FIG. 8;

FIG. 10 is a cross-sectional view of the temperature and pressure sensor assembly of the present application taken along line A-A of FIG. 8;

FIG. 11 is a diagram showing a connection state of a metal connecting member between a circuit module and a temperature sensing element;

FIG. 12 is a front view of FIG. 11;

FIG. 13 is a front view of FIG. 1;

FIG. 14 is a sectional view taken along line B-B of FIG. 13;

FIG. 15 is an enlarged view of a portion of FIG. 14;

FIG. 16 is a side view of FIG. 1;

FIG. 17 is a cross-sectional view taken along line C-C of FIG. 16;

FIG. 18 is a perspective cross-sectional view of the temperature and pressure sensor assembly of the present application;

FIG. 19 is another perspective cross-sectional view of the temperature and pressure sensor assembly of the present application.

Detailed Description

Referring to fig. 2 to 19, a temperature and pressure sensor assembly 100 provided by the present application may be installed in various valve components, such as an electronic expansion valve of a thermal management system, for detecting a pressure parameter and a temperature parameter of a refrigerant, or may be installed in some pipes for detecting a pressure parameter and a temperature parameter of a fluid.

Referring to fig. 2, the temperature and pressure sensor assembly 100 is disposed on a pipe wall of a pipe 200, the pipe 200 having a closed fluid-tight channel 201 for fluid flow in a first direction (i.e., the lateral direction shown in fig. 14). The temperature and pressure sensor assembly 100 of the present application includes a circuit module 2, a pressure sensing element 4, a base 5, and a temperature sensing element 6. The base 5 has a first surface 501 and a second surface 502 which are opposite to each other, the base 5 is provided with a channel 7, a first port 71 located on the second surface 502 and a second port 72 located on the first surface 501, and the first port 71 and the second port 72 are both communicated with the channel 7. The first port 71 may serve as a fluid inlet and the second port 72 may serve as a fluid outlet. That is, the fluid can be guided to the second port 72 through the first port 71, so that the fluid can more easily reach the pressure-sensitive element 4 for pressure detection. The number of passages 7 may be single, two or more, and accordingly, the first port 71 and the second port 72 communicating with the passages 7 may be present in association.

The pressure sensing element 4 has a third surface 41 and a fourth surface 42 which are oppositely arranged, the third surface 41 is arranged facing the first surface 501 of the base 5, and at least a partial area of the third surface 41 forms a pressure sensing area 40 for contacting with the fluid. The circuit module 2 is located on the fourth surface 42 side of the pressure sensing component 4, and the circuit module 2 is electrically connected to the pressure sensing component 4. The pressure sensing component 4 senses the fluid pressure through the pressure sensing area 40, and the pressure signal can be converted into an electrical signal through the circuit module 2 and then transmitted to an external receiving unit. The temperature sensing element 6 comprises an electrically conductive portion and a head 61 connected to the electrically conductive portion for sensing the temperature of the fluid, the head 61 being located on the side of the second surface 502 of the base 5.

The conductive part penetrates through the base 5 and is connected to the circuit module 2, the conductive part is electrically connected with the circuit module 2 and the head part 61, the base 5 is formed by injection molding with the conductive part as an injection molding insert, and the base 5 covers at least one part of the conductive part, so that at least part of the conductive part is tightly wrapped by the base 5. The portion of the conductive portion surrounded by the base 5 is in direct contact with the base 5. In a specific embodiment, the base 5 is formed by an injection molding and encapsulation process with the conductive portion as an injection insert, and at least a part of the conductive portion is covered by the base 5. The integral structure formed by the conductive part and the base is beneficial to protecting the conductive part from directly contacting with fluid, so that the conductive part is more corrosion-resistant and not easy to deform, and the detection accuracy of the temperature sensing element is improved.

In some embodiments, the head 61 of the temperature sensing element 6 may be exposed to the environment so that it may be in direct contact with the fluid, and in other embodiments, the head 61 of the temperature sensing element 6 may also be an injection molded insert as with the conductive portion, so that the head 61 is partially or fully encapsulated by the base. The base 5 may be an insulating material having a good thermal conductivity so that the temperature of the fluid can be transmitted to the head 61 through the base. In some other embodiments, the head 61 may be enclosed in other elements as well, thereby protecting the head 61. In practice, the head 61 may be a packaged thermistor, and the exterior of the thermistor is a resin-based composite material, which has a certain corrosion resistance, so that the head 61 can be in direct contact with the fluid to shorten the response time of temperature detection. The sensitivity of temperature signal detection is improved.

Referring to fig. 11 and 12, the conductive portion includes a metal connector 8 and a pin 62 integrally extending from a head portion 61. The metal connector 8 includes a first portion 81 for connection with the pin 62, a second portion 82 for connection with the circuit module 2, and a third portion 83 connected between the first portion 81 and the second portion 82. The third portion 83 is wrapped by the base 5, the third portion 83 is embedded in the base 5, and the first portion 81 and the second portion 82 are exposed outside the base 5. At least a partial region of the first portion 81 is fixed by welding to the lead 62. At least a partial region of the second portion 82 is soldered to the circuit module 2.

In some embodiments, the first portion 81 and the leads 62 are coated with an anti-corrosion coating, so that the first portion 81 and the leads 62 exposed outside the base 5 are not easily corroded, and the stability of the product and the accuracy of temperature signal detection are not easily affected.

Referring to fig. 4 to 10, the base 5 includes a second end portion 52, and the second end portion 52 includes a flat bottom 521 extending transversely and a ring-shaped wall 522 extending longitudinally from an outer edge of the flat bottom 521. The plate bottom 521 and the annular wall 522 enclose a receiving space 520, the pressure sensing element 4 is at least partially received in the receiving space 520, and the channel 7 is located on the plate bottom 521. The second end 52 is used for forming a pressure chamber between the base 5 and the pressure sensing element 4 after the fluid passes through the channel 7, and also has a housing protection effect on the pressure sensing element 4. The pressure-sensitive component 4 may be fixed in the receiving space 520 of the base 4 by a circumferential seal or a bottom seal.

Referring to fig. 11, 12 and 15, the third portion 83 includes a middle section 831 extending transversely and a first section 832 and a second section 833 respectively bent from two ends of the middle section 831. The first section 832 extends in the longitudinal direction and is connected to the first portion 81, and the second section 833 extends in the longitudinal direction and is connected to the second portion 82. The first portion 81 is exposed at the bottom of the plate and the second portion 82 is exposed at the annular wall 522. This structural arrangement of the metal connecting member 8 ensures that the metal connecting member 8 bypasses the pressure-sensitive element 4 so as not to interfere with the sensitive area 40 of the pressure-sensitive element 4, and the accuracy of the pressure-sensitive element 4 can be ensured. And is beneficial to the miniaturization of the whole product.

Referring to fig. 4 to 10, the susceptor 5 includes a first end portion 51, and the first end portion 51 includes a first arc-shaped wall 511 and a second arc-shaped wall 512 which are spaced apart from each other and are disposed opposite to each other. The first arc-shaped wall 511 and the second arc-shaped wall 512 are located on the other side of the plate bottom 521 away from the annular wall 52, and the first portion 81 and the lead 62 are surrounded by the first arc-shaped wall 511 and the second arc-shaped wall 512, so that the first end portion 51 has a protective effect on the first portion 81 and the lead 62.

The first surface 501 is a surface of the flat bottom 521 facing the accommodating space 520, and the second surface 502 is a surface surrounded by the first arc-shaped wall 511 and the second arc-shaped wall 512.

The maximum distance between the first and second

arcuate walls

511, 512 is less than the maximum radial distance of the annular wall 522. The transverse dimension of the first end 51 is smaller than the transverse dimension of the second end 52, since the temperature sensitive element 6 is arranged in the longitudinal direction in which the channel 7 extends, whereas the pressure sensitive element 4 is arranged in the transverse direction facing the channel 7.

Referring to fig. 4, 5, 10 and 15, the temperature and pressure sensor assembly 100 of the present application includes a housing 9 sleeved outside the base 5. The housing 9 includes a laterally extending support platform 90, a longitudinally extending side wall 91 and a boss 92 bent from the top inner edge of the side wall 91. In some embodiments, housing 9 further includes a protective cover 93 extending longitudinally from the other side of support platform 90 relative to sidewall 91. A protective cover 93 may be provided around the periphery of the first end 51 of the base 5 to protect the base 5 and its internal components. The head 61 of the temperature sensor 6 may be partially or entirely located outside the protective cover 93, or may be located inside the protective cover 93, which is not limited in the present application. The shell 9 is made of a metal material, and the purpose of the metal material is to facilitate flanging to form the convex portion 92, so that the forming difficulty is reduced. Referring to fig. 14 and 17, in some embodiments of the present application, the temperature sensing element 6 protrudes a portion of the length of the housing 9 to be exposed in the closed fluid-tight channel 201, i.e., a portion of the head 61 protrudes from the protective cover 93. Therefore, the temperature sensing element 6 can sense the temperature more timely and fully; in other embodiments, the temperature sensing element 6 may be shorter than the housing 9, and since the fluid may reach the pressure sensing element 4 through the channel 7 to sense the pressure change of the fluid, even if the temperature sensing element 6 is shorter than the housing 9, the temperature signal of the fluid may be sensed preferentially before the pressure sensing element 4 senses the pressure signal.

Referring to fig. 14, a first sealing member 31 is disposed between the pressure sensing element 4 and the base 5, and a second sealing member 32 is disposed between the base 5 and the housing 9. In a specific implementation, the temperature and pressure sensor assembly 100 is installed on a pipe wall of the pipe 200, and a third sealing element 33 is disposed between the housing 9 and the pipe wall of the pipe 200. That is, at the hole cut out on the pipe wall for installing the temperature and pressure sensor assembly 100, the third sealing element 33 seals the space between the housing 9 and the pipe wall, the pipe 200 forms a closed fluid-tight channel 201 for allowing the fluid to flow transversely, and the temperature and pressure sensor assembly forms a chamber for detecting the temperature and pressure of the fluid by the first sealing element 31 between the pressure sensing element 4 and the base 5 and the second sealing element 32 between the base 5 and the housing 9, and is also a chamber for allowing the fluid to flow longitudinally and is closed. Referring to fig. 4, 10 and 15, the temperature and pressure sensor assembly 100 of the present application further includes a cover 1 for shielding the circuit module 2. The cover 1 includes a main body 11 and a protrusion 12 formed on the periphery of the main body 11. The specific assembly and molding process among the cover body 1, the base 5 and the shell 9 is as follows: the protrusion 12 of the lid 1 and the annular wall 522 of the base 5 are at least partially aligned in the longitudinal direction and are fitted into the cylindrical space enclosed by the side wall 91 after being butted, and at this time, the vertical protrusion 92 is pressed inwards by a tool to form the protrusion 92 flanged in the transverse direction. Therefore, the protrusion 12 and the annular wall 522 are clamped and positioned between the support platform 90 and the projection 92, so that the cover 1 can be stably mounted with respect to the base 5 and the housing 9 without falling.

Referring to fig. 4 and 10 to 12, the circuit module 2 includes a first substrate 21, a plurality of electronic components 22 mounted on the first substrate 21, a second substrate 23 connected to the first substrate 21 via a flexible circuit board, and a plurality of electronic components 22 mounted on the second substrate 23. The first substrate 21 and the second substrate 23 are opposed to each other and spaced apart from each other.

The circuit module 2 processes the collected temperature signal and pressure signal according to a certain logic algorithm mode with the pressure signal sensed by the pressure sensing element 4 and the temperature signal sensed by the temperature sensing element 6, and converts the temperature signal and the pressure signal into corresponding voltage values. Since the circuit module 2 is protected within the cover 1, in order to transmit the temperature value and the voltage value to the outside, the temperature and pressure sensor assembly 100 of the present application further includes a plurality of metal sheets 10 embedded on the cover 1. The metal sheet 10 has an outer end portion 101 exposed to the outside of the cover 1 and an inner end portion 102 exposed to the inside of the cover 1. The first substrate 21 is fixed on the fourth surface 42 of the pressure sensing element 4 and connected with the conductive part, specifically, the first substrate 21 is connected with the second part 82 of the metal connecting piece 8, the fourth surface 42 of the pressure sensing element 4 extends out of a plurality of pins, the first substrate 21 is provided with a plurality of small holes, the pins penetrate out of the small holes, the pins are fixed by soldering tin through a spot welding process, and the first substrate 21 and the pressure sensing element 4 are fixed together. The second substrate 23 is connected to the inner end portion 102, in particular, each metal sheet 10 is exposed with a tip from the inner side of the cover 1; the second substrate 23 has a corresponding small hole, the tip penetrates through the hole of the second substrate 23, and the tip is fixed by soldering tin through a spot welding process, so that the second substrate 23 is fixed on the cover 1.

In other embodiments of the present application, the temperature and pressure sensor assembly 100 of the present application further includes a metal pillar 13 embedded on the cover 1, and the metal pillar 13 can be used for connecting with the ground terminal of the external circuit board, so as to protect the circuit module 2, and achieve the function of grounding to prevent the circuit board from breaking down.

The head 61 of the temperature sensing element 6 of the present application may be encapsulated by a corrosion resistant material. The conductive piece of the temperature sensing element 6 is seamlessly embedded into the base 5 through an injection molding and encapsulation process, so that the conductive piece is protected from being corroded easily; in some embodiments, the temperature sensing element 6 may be disposed right below the pressure sensing element 4, which is beneficial to achieve compact and small product structure, so as to ensure product consistency.

The above embodiments are only used for illustrating the present application and not for limiting the technical solutions described in the present application, and the present application should be understood based on the descriptions of directions such as "front", "back", "left", "right", "upper", "lower", etc. for those skilled in the art, and although the present application has been described in detail in the present application with reference to the above embodiments, those skilled in the art should understand that those skilled in the art can still make modifications or equivalent substitutions on the present application, and all technical solutions and modifications thereof that do not depart from the spirit and scope of the present application should be covered within the scope of the claims of the present application.

Claims

1. A temperature and pressure sensor assembly (100), characterized by: comprising a circuit module (2), a pressure sensing element (4), a base (5) and a temperature sensing element (6), wherein the base (5) is provided with a first surface (501) and a second surface (502) which are arranged oppositely, the base (5) is provided with a channel (7) and a first port (71) and a second port (72) which are communicated with the channel (7), the first port (71) is arranged on the second surface (502), the second port (72) is arranged on the first surface (501), the pressure sensing element (4) is provided with a third surface (41) and a fourth surface (42) which are arranged oppositely, the third surface (41) is arranged facing the first surface (501) of the base (5), at least part of the area of the third surface (41) forms a pressure sensing area (40) which is used for being contacted with a fluid, and the circuit module (2) is arranged on the side of the fourth surface (42) of the pressure sensing element (4), the circuit module (2) is electrically connected with the pressure sensing element (4), the temperature sensing element (6) comprises a conductive part and a head part (61) which is connected with the conductive part and used for sensing the temperature of the fluid, and the head part (61) is positioned on the side of the second surface (502) of the base (5); the conductive part is electrically connected with the circuit module (2) and the head part (61); the base (5) is formed by injection molding by taking the conductive part as an injection molding insert, and the base (5) covers at least one part of the conductive part.

2. The temperature and pressure sensor assembly (100) of claim 1, wherein: the head (61) is exposed to the environment to be in contact with the fluid, the conductive part comprises a metal connecting piece (8) and a pin (62) integrally extending from the head (61), the metal connecting piece (8) comprises a first part (81), a second part (82) and a third part (83), the third part (83) is connected between the first part (81) and the second part (82), the third part (83) is embedded in the base (5), the first part (81) and the second part (82) are exposed out of the base (5), at least part of the area of the first part (81) is welded and fixed with the pin (62), and at least part of the area of the second part (82) is welded and fixed with the circuit module (2).

3. The temperature and pressure sensor assembly (100) of claim 2, wherein: the first portion (81) and the pins (62) are coated with an anti-corrosion coating.

4. The temperature and pressure sensor assembly (100) of claim 2, wherein: the base (5) comprises a second end portion (52), the second end portion (52) comprises a flat plate bottom (521) extending transversely and an annular wall (522) extending longitudinally from the outer edge of the flat plate bottom (521), the flat plate bottom (521) and the annular wall (522) enclose to form an accommodating space (520), the pressure sensing element (4) is at least partially accommodated in the accommodating space (520), the channel (7) is arranged on the flat plate bottom (521), and the first surface (501) is a surface of the flat plate bottom (521) facing the accommodating space (520).

5. The temperature and pressure sensor assembly (100) of claim 4, wherein: the third portion (83) comprises a middle section (831) extending transversely, and a first section (832) and a second section (833) formed by bending two ends of the middle section (831) respectively, wherein the first section (832) extends in the longitudinal direction and is connected with the first portion (81), the second section (833) extends in the longitudinal direction and is connected with the second portion (82), the first portion (81) is exposed out of the flat plate bottom (521), and the second portion (82) is exposed out of the annular wall (522).

6. The temperature and pressure sensor assembly (100) of claim 4 or 5, wherein: the base (5) comprises a first end portion (51), the first end portion (51) comprises a first arc-shaped wall (511) and a second arc-shaped wall (512) which are spaced from each other and are arranged oppositely, the first arc-shaped wall (511) and the second arc-shaped wall (512) are located on the other side, away from the annular wall (52), of the flat bottom (521), at least parts of the first portion (81) and the pins (62) are surrounded by the first arc-shaped wall (511) and the second arc-shaped wall (512), and the second surface (502) is a surface surrounded by the first arc-shaped wall (511) and the second arc-shaped wall (512).

7. The temperature and pressure sensor assembly (100) of claim 6, wherein: the maximum distance between the first curved wall (511) and the second curved wall (512) is less than the maximum radial distance of the annular wall (522).

8. The temperature and pressure sensor assembly (100) of claim 4, wherein: the temperature and pressure sensor assembly (100) further comprises a shell (9) sleeved outside the base (5), a first sealing element (31) is arranged between the pressure sensing element (4) and the base (5), and a second sealing element (32) is arranged between the base (5) and the shell (9).

9. The temperature and pressure sensor assembly (100) of claim 8, wherein: the temperature and pressure sensor assembly (100) further comprises a cover body (1) used for shielding the circuit module (2) and a plurality of metal sheets (10) embedded in the cover body (1), the metal sheets (10) are provided with outer end portions (101) exposed to the outer side of the cover body (1) and inner end portions (102) exposed to the inner side of the cover body (1), the circuit module (2) comprises a first substrate (21) and a second substrate (23) which are connected through a flexible circuit board, at least partial areas of the first substrate (21) and the second substrate (23) are oppositely arranged, the circuit module (2) further comprises a plurality of electronic elements (22) distributed on the first substrate (21) and the second substrate (23), the first substrate (21) is fixed on a fourth surface (42) of the pressure sensing element (4), and the second substrate (23) is fixed on the inner side of the cover body (1), the inner end portion (102) of the metal sheet (10) is electrically connected with the second substrate (23).

10. The temperature and pressure sensor assembly (100) of claim 9, wherein: the cover body (1) comprises a main body part (11) and a protruding part (12) formed on the periphery of the main body part (11), the shell (9) comprises a supporting platform (90) extending transversely, a side wall (91) extending longitudinally and a protruding part (92) bent inwards from the inner edge of the top of the side wall (91), the protruding part (12) and the annular wall (522) are at least partially aligned longitudinally, and the protruding part (12) and the annular wall (522) are clamped and positioned between the supporting platform (90) and the protruding part (92) together.