A pressure sensor signal processing assembly

Abstract

A pressure sensor signal processing assembly includes a transverse plate, a first flexible plate, a longitudinal plate, a first flexible plate and a first conductive connecting portion connected in sequence, the transverse plate, the longitudinal plate and the first conductive connecting portion are arranged in sequence from near to far; the first conductive connecting portion is connected with a pressure measurement circuit, and the pressure measurement circuit is arranged on a transverse plane on the far side of the first conductive connecting portion, so that the signal processing circuit and the pressure measurement circuit are well connected.

Description

Technical Field

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

[0002] Pressure sensors using pressure-sensitive heads measure pressure by introducing a pressure fluid into one side of a metal diaphragm and installing a Wheatstone bridge circuit composed of strain gauges or thick-film piezoresistors on the other surface, as shown in publications CN112857635A and CN115406565A. To reduce the lateral size, one concept proposed by the inventors is to vertically position the circuit boards of these pressure sensors. However, because the elastic diaphragm needs to be perpendicular to the pressure connector, efficient and accurate bonding is difficult to achieve when connecting the measurement circuit to the circuit board using a bonding process, even with specially customized equipment.

[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 of the prior art, the present invention provides a pressure sensor signal processing component that integrates a signal processing circuit and a pressure measurement circuit for good connection.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a pressure sensor signal processing component, which 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 and the pressure measurement circuit, and the pressure measurement circuit is arranged on a horizontal plane located on the distal side of the first conductive connection part.

[0006] Preferably, the sensor pressure signal processing assembly is installed on a mounting base, which extends longitudinally and has its side recessed inward to form a receiving groove for accommodating the longitudinal plate, and its proximal end and distal end relatively form a top plate and a semicircular bottom plate; the horizontal plate support is fixed to the proximal surface of the top plate; and the bottom plate is partially sealed at the proximal end of a pressure cylinder.

[0007] Preferably, at least one first buckle connected to the longitudinal plate is provided on each of the two lateral sides of the accommodating groove.

[0008] Preferably, a side of the bottom plate is provided with a clearance opening extending to the bottom plate for the first flexible plate to pass through; a proximal end side of the bottom plate is provided with a second flexible plate arrangement groove laterally connected to the clearance opening.

[0009] Preferably, the edge portion of the top plate is provided with a first flexible plate arrangement groove extending longitudinally and communicating to the accommodating groove at the distal end side, and the first flexible plate arrangement groove is located at the same position as the accommodation opening in the circumferential direction of the mounting base; the proximal end of the top plate is provided with at least two riveting columns, and the riveting columns are riveted to the corresponding riveting holes of the horizontal plate at the proximal end side.

[0010] Preferably, the proximal end surface of the horizontal plate is provided with a plurality of fourth conductive connection portions.

[0011] Preferably, the mounting base is provided with a second buckle for clamping a metal base. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 Front view of the pressure sensor of a preferred embodiment of the present application;

[0013] Figure 2 Sectional view of the pressure sensor of a preferred embodiment of the present application along A-A shown in Figure 1

[0014] Figure 3 Perspective view of the pressure sensor of a preferred embodiment of the present application (the shell is hidden);

[0015] Figure 4 Perspective view of the signal processing assembly of a preferred embodiment of the present application;

[0016] Figure 5 Perspective view of the mounting base of a preferred embodiment of the present application;

[0017] Figure 6 Perspective view of the mounting base of a preferred embodiment of the present application from another angle;

[0018] ​In the figure: 1, pressure joint; 100, pressure channel; 101, connecting pipe; 102, small diameter section; 103, large diameter section; 104, trumpet mouth; 105, support connecting ring; 106, flange; 107, ring cavity; 108, circumferential positioning part; 109, stress isolation groove; 110, support step; 2, pressure sensitive head; 201, metal base; 202, connecting cylinder; 203, sensing cavity; 204, elastic diaphragm; 3, end knob; 300, neck; 301, compression flange; 302, first material reducing blind hole; 303, guide column; 304, compression part; 305, retaining cavity; 4, mounting seat; 400, mounting cavity; 401, compression cylinder; 402, containing groove; 403, first buckle; 404, disassembly hole; 405, clearance; 407, second flexible plate arrangement groove; 408, guide groove; 409, riveting column; 411, first flexible plate arrangement groove; 412, second buckle; 413, circumferential positioning guide part; 414, operation port; 415, notch; 416, second material reducing blind hole; 417, bottom plate; 418, top plate; 5, signal processing assembly; 501, vertical plate; 502, horizontal plate; 503, first flexible plate; 504, second flexible plate; 505, second conductive connection part; 506, first conductive connection part; 507, fourth conductive connection part; 508, guide hole; 509, riveting hole; 510, third conductive connection part; 511, electronic element; 6, electrical connector; 601, transition section; 7, shell; 701, end plate; DETAILED DESCRIPTION

[0019] The technical solutions of the present application will be described clearly and completely below in conjunction with the drawings. The following examples are exemplary and are used only to explain the present application, and cannot be interpreted as a limitation on the present application. In the following description, the same reference signs are used to represent the same or equivalent elements, and repeated descriptions are omitted.

[0020] In the description of the present application, it should be understood that the terms "upper", "lower", "inner", "outer", "left", "right", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the product is used, or the orientation or positional relationship commonly understood by those skilled in the art, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0021] 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.

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] In the above-mentioned embodiments, the pressure channel 100 can be formed by connecting the small-diameter section 102 at the proximal end with the large-diameter section 103 at the distal end, so that the pressure fluid can be easily introduced into the sensing cavity 203.

[0029] In a preferred embodiment of the present application, the pressure sensor further comprises a housing 7, a terminal knob 3, a mounting seat 4 and a signal processing assembly 5 in addition to the pressure measuring assembly. The housing 7 comprises a cylindrical shell extending longitudinally and sealedly connected at the distal end to the pressure connector 1, and an end plate 701 sealingly blocking the proximal end of the cylindrical shell. The terminal knob 3 is fixedly connected to the end plate 701, for example, the longitudinal middle part of the terminal knob 3 can be formed into a neck 300, and the neck 300 can pass through a through hole formed in the end plate 701, and the two are fixedly connected when the terminal knob 3 is injection molded. The terminal knob 3, the housing 7 and the pressure connector 1 jointly form a mounting cavity 400. The mounting seat 4 and the signal processing assembly 5 are arranged in the mounting cavity 400. The signal processing assembly 5 is arranged on the mounting seat 4 and electrically connected to the pressure measuring circuit. The signals outputted from the signal processing assembly 5 are outputted outwardly through a plurality of electrical connectors 6, one end of each of the electrical connectors 6 is arranged inwardly and electrically connected to the signal processing assembly 5 after passing through the terminal knob 3 and the end plate 701. The proximal end of the terminal knob 3 can be provided with a plurality of first material-reducing blind holes 302 extending longitudinally.

[0030] The signal processing assembly 5 can comprise a horizontal plate 502, a first flexible plate 503, a vertical plate 501, a second flexible plate 504 and a first conductive connecting part 506 connected in sequence, wherein the horizontal plate 502, the vertical plate 501 and the first conductive connecting part 506 are arranged in sequence from the proximal end to the distal end. The first conductive connecting part 506 can be electrically connected to the pressure measuring circuit through soldering (as shown by soldering points 515 in the figure). Figure 2 The vertical plate 501 can be provided with electronic elements 511 (such as a conditioning chip, etc.). This arrangement can not only control the transverse size of the pressure sensor to be very small, so that the pressure sensor can be conveniently applied to some relatively narrow spaces (such as some sensor centralized installation modules on a vehicle), but also can make the measurement circuit which must be arranged transversely be well and conveniently connected to the vertical plate 501, thereby avoiding the difficulties in the existing bonding connection process. These difficulties are that the two ends of the aluminum wire or gold wire used in the bonding process should be parallel and the drop should be controlled within 1 mm, otherwise only special customized equipment can be used for bonding, especially when the surfaces of the two connection points are perpendicular or even not parallel, even if the special customized equipment is used, it is also difficult to complete the bonding efficiently and accurately.

[0031] Please refer to Figures 4 to 6In order to reliably install the signal processing assembly 5, the mounting base 4 is longitudinally extended and its side is inwardly recessed to form a receiving groove 402 for accommodating the longitudinal plate 501, and its proximal end and distal end oppositely form a top plate 418 and a semicircular bottom plate 417. The transverse plate 502 is supported and fixed to the proximal surface of the top plate 418. The bottom plate 417 is partially blocked at the proximal end of a pressing cylinder 401. The distal end of the pressing cylinder 401 is pressed against a support step 110 formed on the pressure connector 1. The support step 110 and the support connecting ring 105 form a stress isolation groove 109 to further isolate the installation stress of the pressure connector 1. At least one first buckle 403 is arranged on each of the two lateral sides of the receiving groove 402 to be clamped on the longitudinal plate 501, thereby avoiding the widely used glue bonding process in the prior art and improving production efficiency. A disassembly hole 404 extending in the parallel direction of the second flexible plate arrangement groove 407 can be arranged on the side wall of the pressing cylinder 401, and the disassembly hole 404 extends to the bottom of the receiving groove 402 to facilitate the disassembly of the longitudinal plate 501 in the receiving groove 402. The side of the bottom plate 417 is provided with a clearance 405 extending to the bottom plate 417 for the second flexible plate 504 to pass through. The proximal side of the bottom plate 417 is provided with a second flexible plate arrangement groove 407 which is transversely communicated to the clearance 405. A plurality of second material reducing blind holes 416 can be arranged on the side of the mounting base 4 away from the receiving groove 402.

[0032] The edge of the top plate 418 is provided with a first flexible plate arrangement groove 411 which longitudinally extends and is communicated to the receiving groove 402 on the distal side. The first flexible plate arrangement groove 411 and the clearance 405 are located at the same position in the circumferential direction of the mounting base 4. The proximal end of the top plate 418 is provided with at least two press-in columns 409. The press-in columns 409 are press-in on the corresponding press-in holes 509 on the transverse plate 502 on the proximal side. In other embodiments, preferably, the transverse plate 502 can also be fixed to the mounting base 4 by other means, for example, a circle of pressing flanges 301 longitudinally protruding from the distal end of the end button 3 is pressed on the mounting base 4 on the distal side.

[0033] The proximal surface of the transverse plate 502 is provided with a plurality of fourth conductive connecting parts 507. The electric connecting piece 6 is a resilient piece, for example, a conductive spring, which distal end can be electrically contacted on the fourth conductive connecting part 507 after passing through the end button 3 and the end plate 701. Preferably, the electric connecting piece 6 is a conductive spring with two sections of different coiled diameters, and a tapered transition section 601 is formed between the two sections. A retaining cavity 305 is formed on the end button 3 for accommodating the conductive spring 6, and the retaining cavity 305 has a pressing part 304 which presses the transition section 601 on the distal side against the fourth conductive connecting part 507.

[0034] In some other embodiments, preferably, the end knob 3 is protruded towards the distal side to form a guide post 303. The guide post 303 is inserted into a guide slot 408 of the mounting seat 4 in a fitting manner. A side wall of the mounting seat 4 relative to the clearance opening 405 is provided with an operation opening 414 for giving a space for tin soldering operation. A distal edge of the operation opening 414 is concave to form a notch 415 towards the distal side. An inner side wall of the notch 415 is protruded to form a second clamping buckle 412 for clamping the metal base 201. In this way, the mounting seat 4 and the pressure sensitive head 2 can be fixed conveniently. The pressure cylinder 401 is provided with a circumferential positioning guide 413 which is protruded or concave inwards. Correspondingly, the metal base 201 is provided with a guide slot which is matched with the circumferential positioning guide 413.

[0035] In some other embodiments, preferably, the side of the horizontal plate 502 is provided with a third conductive connecting part 510. The side of the second flexible plate 504 is provided with a second conductive connecting part 505. The second conductive connecting part 505 is electrically connected to the metal shell 7 or the ground of the pressure joint 1 through the ground passage embedded in the mounting seat 4. The third conductive connecting part 510 is grounded through the shell 7.

[0036] The scope of the disclosure is not limited by the detailed description, but is instead defined by the claims, with equivalents of the claims to be included within the scope of the claims. Variations of the claims to provide desirable features and functions are within the scope of the disclosure as described herein.

Claims

1. A pressure sensor signal processing assembly, characterized by, The transverse plate (502), the first flexible plate (503), the longitudinal plate (501), the second flexible plate (504) and the first conductive connecting part (506) are sequentially connected, and the transverse plate (502), the longitudinal plate (501) and the first conductive connecting part (506) are sequentially arranged from the near end to the far end; the first conductive connecting part (506) is electrically connected with a pressure measurement circuit, and the pressure measurement circuit is arranged on a transverse plane on the far end side of the first conductive connecting part (506); The sensor pressure signal processing assembly is mounted on a mounting seat (4), the mounting seat (4) extends longitudinally, and the side portions thereof are recessed inward to form containing grooves (402) for containing the longitudinal plate (501), and the near end and the far end thereof oppositely form a top plate (418) and a semicircular bottom plate (417); the side portions of the bottom plate (417) are provided with accommodation openings (405) extending to the bottom plate (417) for the second flexible plate (504) to pass through; the edge portion of the top plate (418) is provided with a first flexible plate arrangement groove (411) extending longitudinally and communicating to the containing groove (402) on the far end side; the first flexible plate arrangement groove (411) and the accommodation opening (405) are located at the same position in the circumferential direction of the mounting seat (4).

2. The pressure sensor signal processing assembly of claim 1, wherein, The transverse plate (502) is supported and fixed to the near end surface of the top plate (418); and the bottom plate (417) is partially blocked at the near end of a pressing cylinder (401).

3. The pressure sensor signal processing assembly of claim 1, wherein, At least one first buckle (403) is arranged on each of the transverse sides of the containing groove (402) and buckled on the longitudinal plate (501).

4. The pressure sensor signal processing assembly of claim 1, wherein, The near end side of the bottom plate (417) is provided with a second flexible plate arrangement groove (407) communicating to the accommodation opening (405) in the transverse direction.

5. The pressure sensor signal processing assembly of claim 1, wherein, The near end of the top plate (418) is provided with at least two press riveting columns (409) riveted on the corresponding riveting holes (509) of the transverse plate (502) on the near end side.

6. The pressure sensor signal processing assembly of claim 1, wherein, The near end surface of the transverse plate (502) is provided with a plurality of fourth conductive connecting parts (507).

7. The pressure sensor signal processing assembly of claim 1, wherein, The mounting seat (4) is provided with a second buckle (412) for buckling a metal base (201).

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