Pressure measuring component and pressure sensor

Abstract

A pressure measurement assembly comprises: a pressure connector having a longitudinally extending pressure channel therein; and a pressure sensitive head having a distal end recessed inwardly to form a connecting tube with a distal sensing cavity, and a corresponding elastic diaphragm formed on a proximal longitudinal end thereof. A pressure measurement circuit is provided on the proximal longitudinal end surface of the elastic diaphragm. The proximal end of the connecting tube is sealedly connected to the pressure connector to connect the proximal end of the pressure channel to the sensing cavity. The proximal end of the connecting tube is welded to the pressure connector. A pressure sensor employing this pressure measurement assembly can mitigate the adverse effects of assembly stress on measurement results.

Description

Technical Field

[0001] The present invention relates to the technical field of sensors, and in particular to a pressure measurement component and a pressure sensor. Background Art

[0002] Pressure sensors using pressure-sensitive heads measure pressure by introducing a pressure fluid through one side of a metal diaphragm and installing a Wheatstone bridge circuit composed of strain gauges or thick-film piezoresistors on the other surface. In Chinese patent applications with publication numbers CN112857635A and CN115406565A, the pressure diaphragm and pressure interface are integrally connected, causing assembly stress when the pressure interface is connected to the pipe or container being measured to be transmitted to the pressure diaphragm, resulting in distorted measurement results.

[0003] The statements in this section merely provide background information related to the present disclosure and may not constitute prior art. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the present invention provides a pressure measurement assembly and a pressure sensor to improve the adverse effects of assembly stress on measurement results.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a pressure measuring assembly comprising: a pressure connector, in which a longitudinally extending pressure channel is provided; and a pressure sensitive head, wherein one longitudinal distal end thereof is recessed inwardly to form a connecting tube having a distal sensing cavity, and one longitudinal proximal end thereof correspondingly forms an elastic diaphragm, a surface of the longitudinal proximal end of the elastic diaphragm is provided with a pressure measuring circuit, the proximal end of the connecting tube is sealedly connected to the pressure connector so that the proximal end of the pressure channel is connected to the sensing cavity; wherein the proximal end of the connecting tube is welded to the pressure connector.

[0006] Preferably, the longitudinal proximal end and the proximal end of the pressure joint respectively protrude outward laterally to form a flange and a supporting connecting ring, and the connecting tube is fitted on the flange and supported and welded to the supporting connecting ring; the flange, the supporting connecting ring and the connecting tube form an annular cavity.

[0007] Preferably, the inner diameter of the proximal end of the pressure channel gradually expands to form a trumpet-shaped bell mouth.

[0008] The present invention also provides a pressure sensor, which includes: the above-mentioned pressure measuring component; a shell, including a cylindrical shell extending longitudinally and sealed at the distal end to be connected to the pressure joint, and an end plate with the longitudinal proximal end of the cylindrical shell blocked; a terminal button fixedly connected to the end plate, the terminal button, the shell and the pressure joint together form an installation cavity; a mounting seat and a signal processing component arranged in the installation cavity, the signal processing component is arranged on the mounting seat and electrically connected to the pressure measuring circuit; and a plurality of electrical connectors, one end of which is passed inward through the terminal button and the end plate and is electrically connected to the signal processing component.

[0009] Preferably, the signal processing component includes a horizontal plate, a first flexible plate, a vertical plate, a second flexible plate and a first conductive connection part connected in sequence, and the horizontal plate, the vertical plate and the first conductive connection part are arranged in sequence from near to far; the first conductive connection part is electrically connected to the pressure measurement circuit.

[0010] Preferably, the mounting seat extends longitudinally and its sides are recessed inward to form a receiving groove for accommodating the longitudinal plate, and its proximal and distal ends relatively form a top plate and a semicircular bottom plate; the horizontal plate is supported and fixed on the proximal surface of the top plate; the bottom plate is partially sealed on the proximal end of a pressure cylinder; the distal end of the pressure cylinder is pressed against a supporting step formed on the pressure joint; and at least one first clip that is clamped to the longitudinal plate is provided on each lateral side of the receiving groove.

[0011] Preferably, a side of the bottom plate is provided with a clearance opening extending to the bottom plate for the second flexible plate to pass through; a second flexible plate arrangement groove is provided on the proximal end side of the bottom plate and is laterally connected to the clearance opening.

[0012] Preferably, a first flexible plate arrangement groove is provided on the edge of the top plate, extending longitudinally and connected to the accommodating groove toward the distal side, and the first flexible plate arrangement groove and the yielding opening are located at the same position in the circumferential direction of the mounting seat; at least two rivet columns are provided at the proximal end of the top plate, and the rivet columns are riveted to the corresponding rivet holes opened on the cross plate toward the proximal side.

[0013] Preferably, a plurality of fourth conductive connection parts are provided on the proximal surface of the transverse plate; the electrical connection member is an elastic member, the distal end of which passes through the terminal button and the end plate and then electrically contacts the fourth conductive connection part.

[0014] Preferably, the mounting seat is provided with a second buckle for clamping the metal base. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 A front view of a pressure sensor according to a preferred embodiment of the present invention;

[0016] Figure 2 A pressure sensor according to a preferred embodiment of the present invention is provided along Figure 1 A cross-sectional view taken along line AA as shown in FIG.

[0017] Figure 3 A perspective view of a pressure sensor according to a preferred embodiment of the present invention (housing omitted);

[0018] Figure 4 A perspective view of a signal processing component according to a preferred embodiment of the present invention;

[0019] Figure 5 A three-dimensional diagram of a mounting base according to a preferred embodiment of the present invention;

[0020] Figure 6A three-dimensional diagram of a mounting base from another perspective of a preferred embodiment of the present invention;

[0021] In the figure: 1. pressure connector; 100. pressure channel; 101. connecting pipe; 102. small diameter section; 103. large diameter section; 104. bell mouth; 105. supporting connecting ring; 106. flange; 107. annular cavity; 108. circumferential positioning portion; 109. stress isolation groove; 110. supporting step; 2. pressure sensitive head; 201. metal base; 202. connecting cylinder; 203. sensing cavity; 204. elastic diaphragm; 3. terminal button; 300. neck; 301. pressing flange; 302. first material reduction blind hole; 303. guide column; 304. pressing portion; 305. holding cavity; 4. mounting seat; 400. mounting cavity; 401. pressure cylinder; 402. receiving groove; 403. first buckle; 404. disassembly hole; 40 5. Clearance opening; 407. Second flexible board arrangement slot; 408. Guide slot; 409. Rivet column; 411. First flexible board arrangement slot; 412. Second buckle; 413. Circumferential positioning guide; 414. Operation opening; 415. Notch; 416. Second material reduction blind hole; 417. Bottom plate; 418. Top plate; 5. Signal processing assembly; 501. Vertical plate; 502. Horizontal plate; 503. First flexible board; 504. Second flexible board; 505. Second conductive connection portion; 506. First conductive connection portion; 507. Fourth conductive connection portion; 508. Guide hole; 509. Rivet hole; 510. Third conductive connection portion; 511. Electronic component; 6. Electrical connector; 601. Transition section; 7. Housing; 701. End plate; DETAILED DESCRIPTION

[0022] The technical solution of the present invention 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 invention and are not to be construed as limiting the present invention. In the following description, the same reference numerals are used to represent the same or equivalent elements, and repeated descriptions are omitted.

[0023] In the description of the present invention, 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 inventive product is conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. These are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or component 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 invention.

[0024] Furthermore, the terms "mounted," "connected," and "connected" should be interpreted broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on specific circumstances.

[0025] It should be further understood that the term "and / or" used in the present description and the corresponding claims refers to any and all possible combinations of one or more of the listed items.

[0026] like Figures 1 to 3 As shown. The pressure sensor of this embodiment uses such a pressure measuring component, which includes a pressure connector 1 and a pressure sensitive head 2. Among them, a pressure channel 100 extending longitudinally (i.e., the up and down direction in the drawing) is provided in the pressure connector 1. One side of the longitudinal distal end (i.e., the bottom in the drawing) of the pressure sensitive head 2 is recessed inward to form a connecting tube 202 having a distal sensing cavity 203, and an elastic diaphragm 204 is correspondingly formed on the longitudinal proximal side of the pressure sensitive head 2. A pressure measuring circuit is provided on the surface of the longitudinal proximal side of the elastic diaphragm 204. The proximal end of the connecting tube 202 is sealedly connected to the pressure connector 1 so that the proximal end of the pressure channel 100 is connected to the sensing cavity 203. The distal end of the pressure connector 1 is provided with a connecting pipe 101 connected to the container or pipeline to be measured. The side of the pressure connector 1 may be provided with a concave or straight circumferential positioning portion 108. Preferably, the above-mentioned pressure measurement circuit is composed of thick film piezoresistors.

[0027] The proximal end of the connecting tube 202 is welded (e.g., laser welded) to the pressure connector 1. The pressure measurement assembly of this embodiment provides a separate structure for the pressure connector 1 and the pressure sensitive head 2, which are connected together by welding, thereby partially isolating the pressure connector from assembly stress during installation.

[0028] In other embodiments, the longitudinal proximal end and the proximal end of the pressure connector 1 preferably extend outward laterally to form a flange 106 and a support ring 105. The connecting tube 202 is fitted over the flange 106 and supported and welded to the support ring 105. The flange 106, the support ring 105, and the connecting tube 202 enclose an annular cavity 107.

[0029] In this way, the collapsed welding slag can be concentratedly accommodated through the annular cavity during welding, thereby preventing the welding slag from blocking the pressure channel.

[0030] In order to facilitate the liquid to flow out of the sensing cavity when measuring the pressure of the liquid, the inner diameter of the proximal end of the pressure channel 100 can be gradually expanded to form a bell mouth 104.

[0031] In the above-mentioned embodiments, the pressure channel 100 may be formed by connecting a small-diameter section 102 at the proximal end and a large-diameter section 103 at the distal end, so that the pressure fluid can easily enter the sensing cavity 203 .

[0032] In a preferred embodiment of the present invention, the pressure sensor, in addition to the pressure measurement assembly described above, also includes a housing 7, a terminal 3, a mounting base 4, and a signal processing assembly 5. The housing 7 comprises a longitudinally extending cylindrical shell with its distal end sealedly connected to the pressure connector 1, and an end plate 701 with its longitudinal proximal end sealed. The terminal 3 is fixedly connected to the end plate 701. For example, a neck 300 can be formed in the longitudinal middle portion of the terminal 3, and the neck 300 can be passed through a through-hole in the end plate 701 to securely secure the terminal 3 during injection molding. The terminal 3, housing 7, and pressure connector 1 together form a mounting cavity 400. The mounting base 4 and signal processing assembly 5 are both disposed within the mounting cavity 400. The signal processing assembly 5 is mounted on the mounting base 4 and electrically connected to the pressure measurement circuit. Signals generated by the signal processing assembly 5 are output externally via multiple electrical connectors 6, one end of which passes inward through the terminal 3 and end plate 701 and is electrically connected to the signal processing assembly 5. The proximal end of the end button 3 may be provided with a plurality of longitudinally extending first material reduction blind holes 302 .

[0033] The signal processing component 5 may include a horizontal plate 502, a first flexible plate 503, a vertical plate 501, a second flexible plate 504 and a first conductive connection portion 506 connected in sequence. The horizontal plate 502, the vertical plate 501 and the first conductive connection portion 506 are arranged in sequence from near to far. The first conductive connection portion 506 and the pressure measurement circuit can be connected by soldering (such as Figure 2 515 in the figure). An electronic component 511 (such as a conditioning chip, etc.) can be provided on the longitudinal plate 501. This arrangement can, on the one hand, control the lateral size of the pressure sensor to be very small, so that it can be easily applied to some relatively small spaces (such as some sensor centralized installation modules on cars); at the same time, it can enable the measurement circuit that must be arranged horizontally to be well and conveniently connected to the longitudinal plate 501, thereby avoiding the difficulties in the existing bonding connection process. These difficulties are manifested in that the two ends of the aluminum wire or gold wire in the bonding process should be parallel and the drop should be controlled within 1mm, otherwise bonding can only be performed using specially customized equipment. In particular, when the surfaces of the two connection points are perpendicular or even non-parallel, it is difficult to complete the bonding efficiently and accurately even with specially customized equipment.

[0034] Please refer to Figures 4 to 6. In order to ensure the reliable installation of the above-mentioned signal processing component 5, the mounting seat 4 extends longitudinally and its side is recessed inward to form a receiving groove 402 for accommodating the longitudinal plate 501, and its proximal end and distal end relatively form a top plate 418 and a semicircular bottom plate 417. The horizontal plate 502 is supported and fixed on the proximal surface of the top plate 418. The bottom plate 417 is partially blocked on the proximal end of a pressure cylinder 401. The distal end of the pressure cylinder 401 is pressed against a support step 110 formed on the pressure connector 1. A stress isolation groove 109 is formed between the support step 110 and the support connecting ring 105 to further isolate the installation stress of the pressure connector 1. At least one first buckle 403 that is clamped to the longitudinal plate 501 is provided on each of the lateral sides of the receiving groove 402, thereby avoiding the use of the glue bonding process widely used in the prior art and improving production efficiency. A disassembly hole 404 can be provided on the sidewall of the pressing cylinder 401, extending parallel to the second flexible plate arrangement slot 407. This disassembly hole 404 extends to the bottom of the receiving slot 402, facilitating removal of the longitudinal plate 501 within the receiving slot 402. A clearance opening 405 extending to the side of the bottom plate 417 is provided for the second flexible plate 504 to pass through. A second flexible plate arrangement slot 407 is provided on the proximal end of the bottom plate 417, laterally connected to the clearance opening 405. A plurality of second material reduction blind holes 416 can be provided on the side of the mounting base 4 facing away from the receiving slot 402.

[0035] The edge of the top plate 418 is provided with a first flexible plate arrangement groove 411 that extends longitudinally and is connected to the accommodating groove 402 toward the distal end. The first flexible plate arrangement groove 411 and the clearance opening 405 are located at the same position in the circumferential direction of the mounting seat 4. At least two rivet columns 409 are provided at the proximal end of the top plate 418. The rivet columns 409 are riveted to the corresponding rivet holes 509 on the cross plate 502 toward the proximal end. In some other embodiments, preferably, the cross plate 502 can also be fixed to the mounting seat 4 by other means, for example, a circle of clamping flanges 301 formed by the distal longitudinal protrusion of the end button 3 is pressed against the mounting seat 4 toward the distal end.

[0036] The proximal surface of the horizontal plate 502 is provided with a plurality of fourth conductive connection portions 507. The electrical connector 6 is an elastic member, such as a conductive spring, whose distal end can be passed through the terminal button 3 and the end plate 701 to electrically contact the fourth conductive connection portion 507. Preferably, the electrical connector 6 is a conductive spring having two sections with different outer diameters, forming a tapered transition section 601 between the two sections. The terminal button 3 is correspondingly formed with a retaining cavity 305 for accommodating the conductive spring 6. The retaining cavity 305 has a pressing portion 304 that presses the transition section 601 toward the distal end against the fourth conductive connection portion 507.

[0037] In some other embodiments, preferably, the end button 3 protrudes toward the distal end to form a guide post 303. The guide post 303 is cooperatively inserted into a guide groove 408 provided on the mounting seat 4. An operating port 414 is provided on the side wall of the mounting seat 4 relative to the clearance port 405 to provide operating space for soldering. The distal edge of the operating port 414 can be recessed toward the distal end to form a notch 415. The inner side wall of the notch 415 protrudes to form a second buckle 412 for clamping the metal base 201. In this way, the mounting seat 4 and the pressure sensitive head 2 can be conveniently fixed. Among them, the pressure cylinder 401 can protrude inward or be concave to form a circumferential positioning guide portion 413, and correspondingly, a guide groove that cooperates with the circumferential positioning guide portion 413 can be formed on the metal base 201.

[0038] In other embodiments, a third conductive connection portion 510 is preferably provided on the side of the horizontal plate 502. A second conductive connection portion 505 is provided on the side of the second flexible plate 504. The second conductive connection portion 505 is electrically connected to the metal housing 7 or the pressure connector 1 via a grounding path embedded in the mounting base 4 and then grounded. The third conductive connection portion 510 is grounded via the housing 7.

[0039] 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, characterized in that: include: A pressure measurement assembly comprises: a pressure connector (1) having a longitudinally extending pressure channel (100) therein; and a pressure sensitive head (2), wherein one side of the longitudinal distal end of the pressure sensitive head (2) is recessed inward to form a connecting tube (202) having a distal sensing cavity (203), and one side of the longitudinal proximal end of the pressure sensitive head (2) correspondingly forms an elastic diaphragm (204), a surface of the longitudinal proximal end of the elastic diaphragm (204) being provided with a pressure measurement circuit, the proximal end of the connecting tube (202) being sealedly connected to the pressure connector (1) so that the proximal end of the pressure channel (100) is connected to the sensing cavity (203); wherein the proximal end of the connecting tube (202) is welded to the pressure connector (1); The housing (7) comprises a cylindrical shell extending longitudinally and having a distal end sealedly connected to the pressure connector (1), and an end plate (701) sealing the longitudinal proximal end of the cylindrical shell; A terminal button (3) fixedly connected to the end plate (701), the terminal button (3), the housing (7) and the pressure connector (1) together form a mounting cavity (400); A mounting seat (4) and a signal processing component (5) are arranged in the mounting cavity (400), wherein the signal processing component (5) is arranged on the mounting seat (4) and is electrically connected to a pressure measurement circuit; And a plurality of electrical connectors (6), one end of which is electrically connected to the signal processing component (5) after passing through the end button (3) and the end plate (701) inwardly; The signal processing component (5) includes a transverse plate (502), a first flexible plate (503), a longitudinal plate (501), a second flexible plate (504), and a first conductive connection portion (506) connected in sequence, wherein the transverse plate (502), the longitudinal plate (501), and the first conductive connection portion (506) are arranged in sequence from near to far; the first conductive connection portion (506) is electrically connected to the pressure measurement circuit; The mounting seat (4) extends longitudinally and its side portion is recessed inwardly to form a receiving groove (402) for receiving the longitudinal plate (501), and its proximal end and distal end are opposite to form a top plate (418) and a semicircular bottom plate (417).

2. The pressure sensor according to claim 1, wherein The longitudinal proximal end and the proximal end of the pressure joint (1) are laterally extended outward to form a flange (106) and a supporting connecting ring (105), respectively; the connecting tube (202) is fitted on the flange (106) and supported and welded to the supporting connecting ring (105); the flange (106), the supporting connecting ring (105) and the connecting tube (202) form an annular cavity (107).

3. The pressure sensor according to claim 1, wherein The inner diameter of the proximal end of the pressure channel (100) gradually expands to form a trumpet-shaped bell mouth (104).

4. The pressure sensor according to any one of claims 1 to 3, characterized in that The horizontal plate (502) is supported and fixed on the proximal surface of the top plate (418); the bottom plate (417) is partially blocked on the proximal end of a pressure cylinder (401); the distal end of the pressure cylinder (401) is pressed against a supporting step (110) formed on the pressure joint (1); at least one first buckle (403) connected to the longitudinal plate (501) is provided on each of the lateral sides of the accommodating groove (402); and the electrical connector (6) is an elastic member.

5. The pressure sensor according to any one of claims 1 to 3, characterized in that A side of the bottom plate (417) is provided with a clearance opening (405) extending to the bottom plate (417) for the second flexible plate (504) to pass through; a second flexible plate arrangement groove (407) is provided on the proximal end of the bottom plate (417) and is laterally connected to the clearance opening (405).

6. The pressure sensor according to claim 5, characterized in that A first flexible plate arrangement groove (411) extending longitudinally and connected to the accommodating groove (402) toward the distal end is provided on the edge of the top plate (418); the first flexible plate arrangement groove (411) and the clearance opening (405) are located at the same position in the circumferential direction of the mounting seat (4); at least two pressure rivet columns (409) are provided at the proximal end of the top plate (418); the pressure rivet columns (409) are riveted to corresponding rivet holes (509) provided on the transverse plate (502) toward the proximal end.

7. The pressure sensor according to any one of claims 1 to 3, characterized in that The proximal surface of the transverse plate (502) is provided with a plurality of fourth conductive connection parts (507); the electrical connection part (6) is an elastic part, the distal end of which passes through the terminal button (3) and the end plate (701) and then electrically contacts the fourth conductive connection part (507).

8. The pressure sensor according to any one of claims 1 to 3, characterized in that The mounting seat (4) is provided with a second buckle (412) for clamping the metal base (201).

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