Pressure sensor

Abstract

A pressure sensor which is simple in structure and assembly comprises a pressure interface which is provided with a boss at the upper end and is internally provided with a pressure introduction channel of which one end extends upwards to the upper surface of the boss; a first housing and a second housing, wherein the first housing comprises a first housing part of which the upper end is integrally connected to the first part of the terminal part; the second shell comprises a second part of the end button part; the upper part of the first shell part protrudes inwards to form a mounting part with a vertical mounting surface; the circumferential angle of the lower part of the first shell part with the axis of the boss as the center is larger than 180 degrees, and the lower end of the first shell part is fixedly supported on the outer side of the boss; a pressure sensitive element; a plurality of terminals; the electronic module assembly is fixed on the vertical mounting surface and is electrically connected to the terminal and the pressure sensitive element; the cylindrical shell surrounds the outer sides of the lower parts of the first shell and the second shell; the upper end of the first part of the end button part and the upper end of the second part of the end button part are sealed through a first sealant, wherein the upper end extends upwards out of the barrel shell.

Description

Technical Field

[0001] The present application relates to the technical field, and in particular to a pressure sensor. Background Art

[0002] 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. Utility Model Content

[0003] 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.

[0004] To achieve the above objectives, the present application provides the following technical solution: a pressure sensor, comprising:

[0005] 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;

[0006] A first shell and a second shell are combined together on the left and right sides, wherein the first shell includes a first shell portion whose upper end is integrally connected to the first portion of the end button portion; the second shell includes a second portion of the end button portion; the upper portion of the first shell portion protrudes inward to form a mounting portion having a vertical mounting surface; the lower portion of the first shell portion has a circumferential angle greater than degrees with the axis of the boss as the center, and the lower end is fixedly supported on the outer side of the boss; the first portion of the end button portion and the second portion of the end button portion are combined into the end button portion;

[0007] A pressure sensitive element fixed to the upper end of the pressure introduction channel and located inside the first shell portion;

[0008] A plurality of terminals fixed to the first portion of the terminal button;

[0009] 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;

[0010] And a cylindrical shell surrounding the outer side of the lower part of the first shell and the second shell, whose lower end is sealed and fixed to the pressure interface, and whose upper end is sealed and fixed to the button part; the upper end of the first part of the button part and the upper end of the second part of the button part extending upward to the outside of the cylindrical shell are sealed by a first sealant.

[0011] Preferably, at least other portions of the edges of the opposing surfaces of the first and second button portions except for the lower portions are sealed by the first sealant.

[0012] Preferably, the upper portion of the cylinder shell is rolled inward to form a circle of pressing edge, and the pressing edge is pressed downward against a circle of pressing surface formed on the outer side of the end button portion, and a sealing ring is provided between the pressing edge and the pressing surface.

[0013] Preferably, the lower end of the first shell portion is snap-connected to the outer wall of the boss.

[0014] Preferably, the outer wall of the boss forms a circle of annular groove, and the lower end of the first shell portion is formed with a circle or several engaging parts engaged in the groove.

[0015] Preferably, the second shell also includes a second shell portion located on the side of the first shell portion close to the electronic module assembly, the second shell portion is integrally connected to the lower end of the second part of the terminal button portion and forms an installation cavity with the lower part of the first shell portion to accommodate the boss, the pressure sensitive element and the electronic module assembly.

[0016] 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.

[0017] 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.

[0018] 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.

[0019] 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

[0020] Figure 1 is a cross-sectional schematic diagram of a pressure sensor of a preferred embodiment;

[0021] Figure 2It is a front view of the pressure sensor of the preferred embodiment (the shell is hidden);

[0022] Figure 3 A schematic diagram of the cooperation between the first shell portion and the boss of the pressure sensor according to a preferred embodiment;

[0023] Description of reference numerals: 100, pressure sensor; 10, pressure introduction channel; 11a, card slot; 11b, circumferential positioning groove; 11, boss; 12a, stress isolation groove; 12, disk; 18, first support step surface; 19, second support step surface; 1a, first cavity; 1b, second cavity; 1, pressure interface; 21, pressing edge; 2, cylinder shell; 311b, card engaging portion; 311, lower portion; 312a, vertical mounting surface; 312c, buckle; 312d, hot riveting column; 312, mounting portion; 319, circumferential positioning portion; 31, first shell; 329, pressing surface; 32 , terminal; 3, first shell; 41, circuit board; 42, electronic component; 48a, first lead; 48, first electrical connection; 49a, second lead; 49, second electrical connection; 4, electronic module assembly; 50, pressure chamber; 51, lower end; 52, vertical side wall; 59, pressure measurement circuit; 5, pressure sensitive element; 6, terminal; 71, second shell; 7, second shell; 9, sealing ring; 91, sealing rib; 92a, sealing groove; 92b, upper and lower extension parts; 92c, front and rear extension parts; 92e, bottom end; 92, sealant; 93, convex part; 94, concave part. DETAILED DESCRIPTION

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] like Figures 1 to 3 As shown. Among them, Figure 1 is a schematic diagram of a pressure sensor of a preferred embodiment cut along a vertical plane extending forward and backward, Figure 2 This is the front view of the pressure sensor with the shell hidden. Figure 3 The pressure sensor 100 of the preferred embodiment of the present application comprises a pressure interface 1, a first shell 3, a second shell 7, a plurality of terminals 6, a pressure sensitive element 5, an electronic module assembly 4, and a cylindrical shell 2.

[0029] 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 first shell 3 includes a first part 32a of the button portion and a first shell 31 whose upper end is integrally connected to the first part 32a of the button portion. The lower part 311 of the first shell 31 extends vertically and the circumferential angle α centered on the axis of the boss 11 is greater than 180 degrees. The lower end of the first shell 31 is fixedly supported on the outside of the boss 11, for example, it can be supported on a circle of first supporting step surfaces 18 formed opposite to the outside of the boss 11. The upper part of the first shell 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 first shell 31. The above-mentioned multiple terminals 6 are fixed on the button portion 32, and one end of the terminals 6 can extend from the top of the button portion 32 to connect to external equipment. The electronic module assembly 4 is generally vertically arranged, and one side is fixed on the vertical mounting surface 312a, and its upper part is electrically connected to the lower end of 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 cylindrical shell 2 surrounds the outside of the first shell 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 supporting step surfaces 19 formed on the metal pressure interface 1. The upper end of the cylindrical shell 2 is sealed and fixed to the terminal button 32. The pressure interface 1 is preferably made of metal material, and its upper part is generally in the shape of a rotating body for easy processing and manufacturing. Among them, the upper part of the mounting portion 312 can protrude toward one side of the second shell 7 to form a convex portion 93, and a concave portion 94 that matches the convex portion 93 is correspondingly formed on the second shell 7, so that relative positioning is formed by the cooperation of the convex portion 93 and the concave portion 94.

[0030] The electronic module assembly 4 may include a vertical circuit board 41 fixed to the vertical mounting surface 312a. A pressure handling circuit including an electronic component 42 is provided on one side of the circuit board 41 away from the vertical mounting surface 312a. The pressure handling circuit also 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.

[0031] Among them, the first part 32a of the terminal button portion and the second part 32b of the terminal button portion are combined into the terminal button portion 32 in the left-right direction, and the upper end of the terminal button portion 32 extends upward to the outside of the cylinder shell 2. Specifically, the upper end of the terminal 6 extends from the upper end of the first part 32a of the terminal button portion.

[0032] The pressure sensor 100 of this embodiment can be assembled by first fixing the first shell 31 of the first shell 3 downward to the pressure interface 1, then using a bonding machine to electrically connect the electronic module assembly 4 to the terminal 6 with the first lead 48a, and to electrically connect the pressure sensitive element 5 to the electronic module assembly 4 with the second lead 49a; then fixing and assembling the second shell 7 to the first shell 3, so that the first part 32a of the terminal button and the second part 32b of the terminal button are combined into the terminal button 32 in the left-right direction; finally, the first shell 3 and the like are isolated from the environment by the cylindrical shell 2. This greatly simplifies the existing structure of the pressure sensor and is easy to assemble.

[0033] In order to ensure the sealing between the part 92c of the first part 32a of the end button part exposed to the cylinder shell 2 and the part 92d of the second part 32b of the end button part exposed to the cylinder shell 2, the first sealant 92 can be used for sealing. Specifically, on the two opposite surfaces of the first part 32a of the end button part and the second part 32b of the end button part, a sealing groove 92a is formed on one surface, and a sealing rib 91 is formed on the other surface correspondingly protruding, and the sealing rib 91 is arranged in the sealing groove 92a, and the first sealant 92 is poured in the sealing groove 92a. In particular, the sealing groove 92a and the sealing rib 91 can be an inverted "U" shape, for example, the sealing groove 92a can include two upper and lower extension parts 92b spaced front and back and a front and rear extension part 92c whose two ends are respectively connected to the upper ends of the two 92b. The bottom end (i.e., the lower end) 921 of the upper and lower extension parts 92b preferably extends downward to the inside of the cylinder shell 2, more specifically, extends to the lower side of the sealing edge of the end button part 32 and the cylinder shell 2. In this way, the pressure sensor 100 can be simplified while improving the sealing performance of the pressure sensor 100 , thereby preventing rain or water vapor from invading the interior of the pressure sensor 100 through the gap between the first button portion 32 a and the second button portion 32 b .

[0034] 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 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.

[0035] Preferably, the lower end of the first shell 31 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 31 is formed with a circle or several engaging parts 311b engaged in the groove 11a.

[0036] In some other solutions, preferably, the pressure sensor further includes a second shell portion 71 fixed to the first shell portion 31 and close to the side of the electronic module assembly 4. The second shell 7 and the first shell 3 enclose a mounting cavity for accommodating the boss 11, the pressure sensitive element 5 and the electronic module assembly 4. Similarly, the lower end of the second shell portion 71 may also be formed with a circle or several engaging portions (not shown) engaged in the slot 11a. The upper end of the second shell portion 71 may be integrally connected to the second portion 32b of the terminal button portion.

[0037] The installation cavity includes a first cylindrical cavity 1a formed by the second shell 71 and the first shell 31. 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 71 and the first shell 31, and the second cavity 1b is downwardly connected to the first cavity 1a.

[0038] 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.

[0039] 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 first shell portion 31 to be electrically connected to the electronic module assembly 4 .

[0040] 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 measuring circuit 59. In this way, the pressure measuring circuit 59 can be coplanar with the surface of the side of its circuit board 41 away from the first shell 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.

[0041] 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 second 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 may also be composed of thick film resistors to form a Wheatstone full bridge.

[0042] 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

1. A pressure sensor (100), characterized in that: include: A pressure interface (1) having a boss (11) formed at its upper end and a pressure introduction channel (10) formed inside thereof, one end of which extends upward to the upper surface of the boss (11); A first shell (3) and a second shell (7) are combined together on the left and right, wherein the first shell (3) comprises a first shell portion (31) whose upper end is integrally connected to the first portion (32a) of the end button portion; the second shell (7) comprises a second portion (32b) of the end button portion; the upper portion of the first shell portion (31) protrudes inward to form a mounting portion (312) having a vertical mounting surface (312a); the lower portion (311) of the first shell portion (31) has a circumferential angle greater than 180 degrees with the axis of the boss (11) as the center, and the lower end is fixedly supported on the outer side of the boss (11); the first portion (32a) of the end button portion and the second portion (32b) of the end button portion are combined into the end button portion (32); A pressure sensitive element (5) is sealed and fixed to the upper end of the pressure introduction channel (10) and is located inside the first shell portion (31); A plurality of terminals (6) fixed to the first portion (32a) of the terminal button; An electronic module assembly (4) fixed to the vertical mounting surface (312a), the upper portion of which is electrically connected to the terminal (6) and the lower portion of which is electrically connected to the pressure sensitive element (5); and a cylindrical shell (2) surrounding the outer side of the lower parts of the first shell (3) and the second shell (7), wherein the lower end of the cylindrical shell (2) is sealed and fixed to the pressure interface (1), and the upper end of the cylindrical shell (2) is sealed and fixed to the end button (32); the upper end of the first part (32a) of the end button and the upper end of the second part (32b) of the end button extending upward to the outside of the cylindrical shell (2) are sealed by a first sealant (92).

2. The pressure sensor (100) according to claim 1, characterized in that: At least other portions of the edges of the opposing surfaces of the first end button portion (32a) and the second end button portion (32b) except for the lower side portions are sealed by the first sealant (92).

3. The pressure sensor (100) according to claim 2, characterized in that: The upper portion of the cylindrical shell (2) is rolled inward to form a circle of pressing edge (21), and the pressing edge (21) is pressed downward against a circle of pressing surface (329) formed on the outer side of the end button portion (32), and a sealing ring (9) is provided between the pressing edge (21) and the pressing surface (329).

4. The pressure sensor (100) according to claim 1, characterized in that: The lower end of the first shell portion (31) is clamped on the outer wall of the boss (11).

5. The pressure sensor (100) according to claim 4, characterized in that: The outer wall of the boss (11) forms a circle of annular clamping groove (11a), and the lower end of the first shell part (31) is formed with a circle or a plurality of clamping parts (311b) that are clamped in the clamping groove (11a).

6. The pressure sensor (100) according to claim 5, characterized in that: The second shell (7) also includes a second shell portion (71) located on the side of the first shell portion (31) close to the electronic module assembly (4), and the second shell portion (71) is integrally connected to the lower end of the second part (32b) of the terminal button portion and, together with the lower part of the first shell (3), forms an installation cavity for accommodating the boss (11), the pressure sensitive element (5) and the electronic module assembly (4).

7. The pressure sensor (100) according to claim 6, characterized in that: The installation cavity comprises a first columnar cavity (1a) formed by the second shell portion (71) and the first shell portion (31), and the boss (11) and the pressure sensitive element (5) are located inside the first cavity (1a).

8. The pressure sensor (100) according to any one of claims 1 to 7, characterized in that: A vertically extending circumferential positioning portion (319) is formed on the inner wall of the first shell portion, and a circumferential positioning groove (11b) for cooperating and accommodating the positioning portion is formed on the boss (11).

9. The pressure sensor (100) according to any one of claims 1 to 7, characterized in that: The lower end of the terminal (6) 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).

10. The pressure sensor (100) according to any one of claims 1 to 7, characterized in that: The pressure sensitive element (5) has a vertical side wall and a pressure chamber (50) located on the inner side of the vertical side wall and connected to the pressure introduction channel (10); a pressure measurement circuit electrically connected to the electronic module assembly (4) is arranged on the outer side of the vertical side wall.

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