CN118603399A - A pressure sensor - Google Patents

Abstract

A pressure sensor of simple construction and assembly, comprising: the pressure interface is provided with a boss at the upper end, and a pressure introducing channel with one end extending upwards to the upper surface of the boss is formed in the pressure interface; the integrated component comprises a terminal button part and a supporting part, the upper end of the supporting part is integrally connected to the terminal button part, the supporting part comprises a first shell part which extends vertically and takes the axis of the boss as the center, the circumferential angle of the first shell part is larger than the degree, and the lower end of the first shell part is fixedly supported on the outer side of the boss; the upper part of the supporting part protrudes inwards to form a mounting part with a vertical mounting surface; the pressure sensing element is blocked and fixed at the upper end of the pressure introducing channel and positioned at the inner side of the supporting part; a plurality of terminals fixed on the terminal button portion; an electronic module assembly secured to the vertical mounting surface with an upper portion thereof electrically connected to the terminals and a lower portion thereof electrically connected to the pressure sensitive element; and a cylinder housing surrounding the outer side of the supporting part, the lower end of the cylinder housing is fixed to the pressure interface in a sealing way, and the upper end of the cylinder housing is fixed to the end button part in a sealing way.

Description

A pressure sensor

Technical Field

The present application relates to the technical field, and in particular to a pressure sensor.

Background Art

For a type of pressure sensor disclosed in CN219265569U that has a smaller size requirement, vertically arranging the circuit board can give it a larger area, which has great advantages, but it will make it difficult to automate the connection between the circuit board and the pressure sensitive element and the terminal through equipment such as a bonding machine. In addition, since the circuit board needs to be reliably supported before welding or bonding to ensure that there is no displacement between the pressure sensitive element and the circuit board, which may cause the lead to break or fall off, this also increases the number of components and assembly complexity to a certain extent.

Summary of the invention

In view of the deficiencies of the prior art, the present application provides a pressure sensor to reduce the structural and assembly complexity of the pressure sensor while reliably fixing the circuit board.

To achieve the above objectives, the present application provides the following technical solution: a pressure sensor, comprising:

The pressure interface has a boss formed on its upper end and a pressure introduction channel formed inside thereof with one end extending upward to the upper surface of the boss;

An integrally formed component comprises a button portion and a support portion whose upper end is integrally connected to the button portion, wherein the support portion comprises a first shell portion extending vertically and having a circumferential angle greater than 180 degrees centered on the axis of the boss, wherein the lower end of the first shell portion is fixedly supported on the outer side of the boss; the upper portion of the support portion protrudes inwardly to form a mounting portion having a vertical mounting surface;

A pressure sensitive element fixed to the upper end of the pressure introduction channel and located inside the support portion is blocked;

A plurality of terminals fixed on the terminal button portion;

An electronic module assembly fixed to the vertical mounting surface, with an upper portion electrically connected to the terminal and a lower portion electrically connected to the pressure sensitive element;

and a cylindrical shell surrounding the outer side of the supporting portion, wherein the lower end of the cylindrical shell is sealed and fixed to the pressure interface, and the upper end of the cylindrical shell is sealed and fixed to the terminal button portion.

Preferably, the lower end of the first shell portion is snap-connected to the outer wall of the boss.

Preferably, the outer wall of the boss forms a circle of annular clamping groove, and the lower end of the first shell part is formed with a circle or several clamping parts that are clamped in the clamping groove.

Preferably, the pressure sensor further comprises a second shell portion fixed to a side of the first shell portion close to the electronic module assembly, and the second shell portion and the integrally formed element form an installation cavity for accommodating the boss, the pressure sensitive element and the electronic module assembly.

Preferably, a circle or a plurality of engaging portions engaged in the engaging groove are formed at the lower end of the second shell portion.

Preferably, the installation cavity comprises a first cylindrical cavity formed by the second shell portion and the first shell portion, and the boss and the pressure sensitive element are located inside the first cavity.

Preferably, a vertically extending circumferential positioning portion is formed on the inner wall of the first shell portion, and a circumferential positioning groove that cooperates with and accommodates the positioning portion is formed on the boss.

Preferably, the lower end of the terminal passes through the terminal button downward and is exposed to the vertical mounting surface, and is electrically connected to the electronic module assembly.

Preferably, the terminal button portion includes a first part and a second part which are combined together to form a plurality of stepped retaining holes, the terminal is a stepped spring terminal, the stepped spring terminal is retained in the stepped retaining hole and the upper end extends upward from the terminal button portion; a plurality of electrical connection elements are fixed to the second part, one end of which extends into the stepped retaining hole and electrically contacts the lower end of the stepped spring terminal, and the other end of which passes through the terminal button portion downward and is exposed to the vertical mounting surface and is electrically connected to the electronic module assembly.

Preferably, the pressure sensitive element has a vertical side wall and a pressure chamber located on the inner side of the vertical side wall and connected to the pressure introduction channel; a pressure measurement circuit electrically connected to the electronic module assembly is arranged on the outer side of the vertical side wall.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a schematic cross-sectional view of a pressure sensor according to a first embodiment;

FIG2 is a front view of the pressure sensor of the first embodiment (without the shell);

3 is a schematic diagram of the cooperation between the first shell portion and the boss of the pressure sensor of the first embodiment;

FIG4 is a front view of the pressure sensor of the second embodiment (without the shell);

Explanation of reference numerals: 100, pressure sensor; 10, pressure introduction channel; 11a, slot; 11b, circumferential positioning slot; 11, boss; 18, first support step surface; 19, second support step surface; 1a, first cavity; 1b, second cavity; 1, pressure interface; 21, press edge; 2, cylinder shell; 311b, snap-fit portion; 311, first shell; 312a, vertical mounting surface; 312c, buckle; 312d, hot riveting column; 312, mounting portion; 319, circumferential positioning portion; 31, support portion; 321, first part; 322, second part; 329, clamping surface; 32, terminal button; 3a, stepped retaining hole; 3, integrally formed component; 41, circuit board; 42, electronic component; 48, first electrical connection part; 49, second electrical connection part; 4, electronic module assembly; 50, pressure chamber; 52, vertical side wall; 59, pressure measurement circuit; 5a, stepped spring terminal; 5, pressure sensitive element; 6, terminal; 7, second shell; 12, disk; 48a, first lead; 49a, second lead; 51, lower end; 9, sealing ring.

DETAILED DESCRIPTION

The technical solution of the present application will be clearly and completely described below in conjunction with the accompanying drawings. The following embodiments are exemplary and are only used to explain the present application, and cannot be interpreted as limiting the present application. In the following description, the same symbols are used to represent the same or equivalent elements, and repeated descriptions are omitted.

In the description of the present application, it should be understood that the terms "upper", "lower", "inside", "outside", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the products of the present application are conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

In addition, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

It should be further understood that the term “and/or” used in the specification and corresponding claims of this application refers to any and all possible combinations of one or more of the listed items.

As shown in Figures 1 to 3, Figure 1 is a schematic diagram of the pressure sensor of the first embodiment cut by a vertical plane extending forward and backward, Figure 2 is a front view of the pressure sensor after the cylinder shell is hidden, and Figure 3 is a schematic diagram of the cooperation between the first shell and the boss. The pressure sensor 100 of the first embodiment of the present application includes a pressure interface 1, an integrally formed element 3, a plurality of terminals 6, a pressure sensitive element 5, an electronic module assembly 4, and a cylinder shell 2.

Among them, a boss 11 is formed at the upper end of the pressure interface 1, and a pressure introduction channel 10 is formed inside the pressure interface 1, one end of which extends upward to the upper surface of the boss 11. The one-piece molded component 3 includes a terminal button portion 32 and a support portion 31 whose upper end is integrally connected to the terminal button portion 32. The support portion 31 includes a first shell portion 311 that extends vertically and has a circumferential angle α greater than 180 degrees centered on the axis of the boss 11. The lower end of the first shell portion 311 is fixedly supported on the outside of the boss 11, for example, it can be supported on a circle of first support step surfaces 18 formed relatively on the outside of the boss 11. The upper part of the support portion 31 protrudes inward to form a mounting portion 312 having a vertical mounting surface 312a. The pressure sensitive element 5 is sealed and fixed to the upper end of the pressure introduction channel 10 and is located on the inner side of the support portion 31. The above-mentioned multiple terminals 6 are fixed on the terminal button portion 32. The electronic module assembly 4 is generally vertically arranged and fixed to the vertical mounting surface 312a, and its upper part is electrically connected to the terminal 6 through the first lead 48a, and its lower part is electrically connected to the pressure sensitive element 5 through the second lead 49a. The barrel shell 2 surrounds the outside of the support portion 31, and its lower end is sealed and fixed to the pressure interface 1, for example, it can be supported and welded on a circle of second support step surfaces 19 formed on the metal pressure interface 1. The upper end of the barrel shell 2 is sealed and fixed to the terminal button portion 32. The pressure interface 1 is preferably made of metal material, and its upper part is generally shaped as a body of revolution to facilitate processing and manufacturing.

The electronic module assembly 4 may include a vertical circuit board 41 fixed to the vertical mounting surface 312a. A pressure handling circuit is provided on one side of the circuit board 41 away from the vertical mounting surface 312a. The pressure handling circuit includes a plurality of first electrical connection portions 48 located at the upper portion of the circuit board 41 and electrically connected to the plurality of terminals 6 in a one-to-one correspondence, and a plurality of second electrical connection portions 49 located at the lower portion of the circuit board 41 and electrically connected to the pressure sensitive element 5.

The pressure sensor 100 of this embodiment can be assembled by first fixing the support portion 31 of the integrally formed element 3 downward to the pressure interface 1, and then electrically connecting the electronic module assembly 4 to the terminal 6 with the first lead 48a and electrically connecting the pressure sensitive element 5 to the electronic module assembly 4 with the second lead 49a through a bonding machine; and then isolating the integrally formed element 3 and the like from the environment through the cylindrical shell 2. This greatly simplifies the existing structure of the pressure sensor and is easy to assemble.

The circuit board 41 can be fixed to the vertical mounting surface 312a by a plurality of buckles 312c formed on the circuit board 41, and a positioning recess (not marked) for positioning the circuit board 41 can also be formed on the vertical mounting surface 312a. In some other solutions, the circuit board 41 can also be additionally or alternatively fixed to the vertical mounting surface 312a by a plurality of heat rivet columns 312d formed on the vertical mounting surface 312a.

Preferably, the lower end of the first shell 311 is engaged with the outer wall of the boss 11, for example, the outer wall of the boss 11 can form a circle of annular groove 11a. The lower end of the first shell 311 is formed with a circle or several engaging parts 311b engaged in the groove 11a.

In some other solutions, preferably, the pressure sensor further includes a second shell portion 7 fixed to the first shell portion 311 and close to the side of the electronic module assembly 4. The second shell portion 7 and the integrally formed element 3 form a mounting cavity for accommodating the boss 11, the pressure sensitive element 5 and the electronic module assembly 4. Similarly, a circle or several engaging portions (not shown) engaged in the slot 11a are formed at the lower end of the second shell portion 7.

The mounting cavity includes a first cylindrical cavity 1a formed by the second shell 7 and the first shell 311. The boss 11 and the pressure sensitive element 5 are located inside the first cavity 1a. Accordingly, a second cavity 1b for accommodating the electronic module assembly 4 is formed between the second shell 7 and the support portion 31, and the second cavity 1b is downwardly connected to the first cavity 1a.

In some other solutions, preferably, a vertically extending circumferential positioning portion 319 is formed on the inner wall of the first shell portion. A circumferential positioning groove 11b is formed on the boss 11 to match and accommodate the positioning portion.

The lower end of the terminal 6 can pass through the terminal button portion 32 downward and be exposed to a side of the vertical mounting surface 312 a away from the support portion 31 so as to be electrically connected to the electronic module assembly 4 .

Please refer to FIG. 4 , the connection structure between the terminal and the electronic module assembly 4 of the second embodiment is different: the terminal button portion 32 includes a first portion 321 and a second portion 322 that are combined together to form a plurality of stepped retaining holes 3a. The terminal 6 is a stepped spring terminal 5a. The stepped spring terminal 5a is retained in the stepped retaining hole 3a and the upper end extends upward from the terminal button portion 32. A plurality of electrical connection elements are fixed to the second portion 322, one end 333b of which extends into the stepped retaining hole 3a and electrically contacts the lower end of the stepped spring terminal 5a, and the other end 333a of which passes through the terminal button portion 32 downward and is exposed to the vertical mounting surface 312a and is electrically connected to the electronic module assembly 4.

In the above embodiments, the pressure sensitive element 5 may have a vertical side wall 52 and a pressure chamber 50 located inside the vertical side wall 52 and connected to the pressure introduction channel 10. The outer surface of the vertical side wall 52 is provided with a pressure measurement circuit 59. In this way, the pressure measurement circuit 59 can be coplanar with the surface of the side of the circuit board 41 away from the support portion 31, or only have a small distance, so as to facilitate the operation of the bonding machine. The lower end 51 of the pressure sensitive element 5 can be sealed and welded to the upper end of a tube body (not marked) formed by the upper end of the boss 11 protruding upward, and the upper end of the pressure introduction channel 10 is connected to the inner cavity of the tube body. The outer wall of the tube body can protrude outward to form a disk body 12, and a stress isolation groove 12a is formed between the disk body 12 and the upper end of the boss 11. The outer edge of the disk body 12 can be formed with a circumferential positioning groove that cooperates with the circumferential positioning portion 319.

The outer side of the vertical side wall 52 is provided with an electrical connection to the electronic module assembly 4. The upper part of the cylindrical shell 2 is rolled inward to form a pressing edge 21. The pressing edge 21 is pressed downward on a circle of pressing surface 329 formed on the outer side of the end button portion 32, and a sealing ring 9 may be provided between the pressing edge 21 and the pressing surface 329, and a sealant may be applied between the pressing edge 21 and the pressing surface 329 additionally or alternatively for sealing. The pressure measurement circuit 59 may be composed of two half-bridge strain gauges 54 to form a Wheatstone full bridge, or directly include a full-bridge strain gauge. In some other schemes, the pressure measurement circuit 59 can also be composed of thick film resistors to form a Wheatstone full bridge.

The scope of the disclosure is defined not by the detailed description but by the claims and their equivalents, and all variations within the scope of the claims and their equivalents are construed as being included in the disclosure.

Claims (10)

1. A pressure sensor (100), characterized by comprising:

A pressure interface (1), the upper end of which forms a boss (11), and the interior of which forms a pressure introduction channel (10) with one end extending upwards to the upper surface of the boss (11);

The integrated component (3) comprises a button end part (32) and a supporting part (31) with the upper end integrally connected to the button end part (32), wherein the supporting part (31) comprises a first shell part (311) which extends vertically and takes the axis of a boss (11) as the center and has a circumferential angle of more than 180 degrees, and the lower end of the first shell part (311) is fixedly supported outside the boss (11); the upper part of the supporting part (31) protrudes inwards to form a mounting part (312) with a vertical mounting surface (312 a);

a pressure sensitive element (5) fixed at the upper end of the pressure introducing channel (10) and positioned at the inner side of the supporting part (31) is blocked;

a plurality of terminals (6) fixed to the terminal button portion (32);

-an electronic module assembly (4) fixed to said vertical mounting surface (312 a), the upper part of which is electrically connected to said terminals (6) and the lower part of which is electrically connected to said pressure sensitive element (5);

And a cylinder housing (2) surrounding the outside of the supporting portion (31), the lower end of which is sealingly fixed to the pressure port (1), and the upper end of which is sealingly fixed to the end knob portion (32).

2. The pressure sensor (100) of claim 1, wherein a lower end of the first shell portion (311) is snapped to an outer wall of the boss (11).

3. The pressure sensor (100) according to claim 2, wherein the outer wall of the boss (11) forms a ring-shaped clamping groove (11 a), and the lower end of the first shell portion (311) forms one or a plurality of clamping portions (311 b) which are clamped in the clamping groove (11 a).

4. A pressure sensor (100) according to claim 3, further comprising a second housing part (7) fixed to a side of the first housing part (311) close to the electronic module assembly (4), the second housing part (7) and the integrally formed element (3) enclosing a mounting cavity accommodating the boss (11), the pressure sensitive element (5) and the electronic module assembly (4).

5. The pressure sensor (100) according to claim 4, wherein a lower end of the second housing portion (7) is formed with one or a plurality of engaging portions engaged in the engaging groove (11 a).

6. The pressure sensor (100) of claim 4, wherein the mounting cavity comprises a columnar first cavity (1 a) surrounded by the second shell portion (7) and the first shell portion (311), the boss (11) and the pressure sensitive element (5) being located inside the first cavity (1 a).

7. The pressure sensor (100) of any one of claims 1 to 6, wherein the first housing portion inner wall has a vertically extending circumferential positioning portion (319) formed thereon, and the boss (11) has a circumferential positioning groove (11 b) formed thereon for cooperatively receiving the positioning portion.

8. The pressure sensor (100) of any one of claims 1 to 6, wherein a lower end of the terminal (6) extends downwardly through the end knob portion (32) and is exposed to the vertical mounting surface (312 a) and is electrically connected to the electronic module assembly (4).

9. The pressure sensor (100) of any one of claims 1 to 6, wherein the end knob portion (32) comprises a first portion (321) and a second portion (322) combined together and enclosing a plurality of stepped retention holes (3 a), the terminal (6) being a stepped spring terminal (5 a), the stepped spring terminal (5 a) being retained within the stepped retention hole (3 a) and an upper end projecting upwardly out of the end knob portion (32); a plurality of electrical connection elements are fixed to the second portion (322), one end of which protrudes into the stepped holding hole (3 a) and is electrically contacted to the lower end of the stepped spring terminal (5 a), and the other end of which penetrates the end knob portion (32) downward and is exposed to the vertical mounting surface (312 a) and is electrically connected to the electronic module assembly (4).

10. The pressure sensor (100) according to any one of claims 1 to 6, wherein the pressure sensitive element (5) has a vertical side wall and a pressure chamber (50) located inside the vertical side wall and communicating to the pressure introduction channel (10); the outside of the vertical side wall is provided with a pressure measuring circuit electrically connected to the electronic module assembly (4).