CN219104229U - Pressure measurement assembly and pressure sensor - Google Patents

Abstract

A pressure measurement assembly, comprising: a pressure joint, in which a longitudinally extending pressure channel is arranged; the pressure sensitive head is inwards sunken at one side of the longitudinal far end to form a connecting cylinder with a far-end sensing cavity, an elastic diaphragm is correspondingly formed at one side of the longitudinal near end of the connecting cylinder, a pressure measuring circuit is arranged on the surface of one side of the longitudinal near end of the elastic diaphragm, and the near end of the connecting cylinder is in sealing connection with the pressure joint so that the near end of the pressure channel is communicated with the sensing cavity; wherein, the proximal end of the connecting cylinder is welded with the pressure joint. The pressure sensor adopting the pressure measuring assembly can improve the adverse effect of assembly stress on the measurement result.

Description

Pressure measurement assembly and pressure sensor

Technical Field

The utility model relates to the technical field of sensors, in particular to a pressure measurement assembly and a pressure sensor.

Background

A pressure sensor using a pressure sensitive head is provided, which performs pressure measurement by introducing pressure fluid on one side of a metal diaphragm and setting a Wheatstone bridge consisting of strain gauges or thick film piezoresistors on the other side surface. In chinese patent application publication No. CN112857635A, CN115406565a, the integral connection of the pressure diaphragm with the pressure port results in the transmission of assembly stress to the pressure diaphragm when the pressure port is connected to the pipe or vessel to be measured, resulting in a deviation of the measurement result.

The statements in this section merely provide background information related to the present disclosure and may not constitute prior art.

Disclosure of Invention

In view of the shortcomings of the prior art, the present utility model provides a pressure measurement assembly and pressure sensor to improve the adverse effects of assembly stress on the measurement results.

In order to achieve the above purpose, the present utility model provides the following technical solutions: a pressure measurement assembly, comprising: a pressure joint, in which a longitudinally extending pressure channel is arranged; the pressure sensitive head is inwards sunken at one side of the longitudinal far end to form a connecting cylinder with a far-end sensing cavity, an elastic diaphragm is correspondingly formed at one side of the longitudinal near end of the connecting cylinder, a pressure measuring circuit is arranged on the surface of one side of the longitudinal near end of the elastic diaphragm, and the near end of the connecting cylinder is in sealing connection with the pressure joint so that the near end of the pressure channel is communicated with the sensing cavity; wherein, the proximal end of the connecting cylinder is welded with the pressure joint.

Preferably, the longitudinal proximal end of the pressure joint and the proximal end thereof respectively protrude outwards and transversely to form a flange and a supporting connecting ring, and the connecting cylinder is sleeved on the flange in a matched manner and is supported and welded on the supporting connecting ring; the flange, the support connecting ring and the connecting cylinder enclose an annular cavity.

Preferably, the proximal inner diameter of the pressure channel is gradually enlarged to form a flare.

The present utility model also provides a pressure sensor comprising: the pressure measurement assembly described above; the shell comprises a cylinder shell which extends longitudinally and is connected to the pressure joint in a sealing way at the far end and an end plate for sealing the near end of the cylinder shell longitudinally; the end button is fixedly connected to the end plate, and the end button, the shell and the pressure joint form a mounting cavity; the mounting seat and the signal processing assembly are arranged in the mounting cavity, and the signal processing assembly is arranged on the mounting seat and is electrically connected to the pressure measuring circuit; and a plurality of electric connecting pieces, one ends of which are penetrated through the end buttons and the end plates inwards and then are electrically connected to the signal processing assembly.

Preferably, the signal processing assembly comprises a transverse plate, a first flexible plate, a longitudinal plate, a second flexible plate and a first conductive connecting part which are sequentially connected, wherein the transverse plate, the longitudinal plate and the first conductive connecting part are sequentially arranged from near to far; the first conductive connection is electrically connected to the pressure measurement circuit.

Preferably, the mounting seat extends longitudinally and the side part of the mounting seat is recessed inwards to form a containing groove for containing the longitudinal plate, and the proximal end and the distal end of the mounting seat are opposite to each other to form a top plate and a semicircular bottom plate; the transverse plate is supported and fixed on the proximal end surface of the top plate; the bottom plate is partially blocked at the proximal end of a pressing cylinder; the distal end of the pressing cylinder is propped against a supporting step formed on the pressure joint; at least one first buckle clamped on the longitudinal plate is arranged on each of the two lateral sides of the accommodating groove.

Preferably, the side part of the bottom plate is provided with a yielding port extending to the bottom plate for the second flexible plate to pass through; a second flexible board arrangement groove which is transversely communicated with the abdication opening is formed in one side of the proximal end of the bottom plate.

Preferably, the side part of the top plate is provided with a first flexible plate arrangement groove which extends longitudinally and is communicated to the accommodating groove towards one side of the far end, and the first flexible plate arrangement groove and the abdication port are positioned at the same position in the circumferential direction of the mounting seat; the near end of the top plate is provided with at least two riveting columns, and the riveting columns are riveted on corresponding riveting holes on the transverse plate towards one side of the near end.

Preferably, the proximal end surface of the cross plate is provided with a plurality of fourth conductive connections; the electric connecting piece is an elastic piece, and the far end of the electric connecting piece is penetrated with the end button and the end plate and then is electrically contacted with the fourth conductive connecting part.

Preferably, the mounting seat is provided with a second buckle for clamping the metal base.

Drawings

FIG. 1 is a front view of a pressure sensor according to a preferred embodiment of the present utility model;

FIG. 2 is a cross-sectional view of a pressure sensor along A-A shown in FIG. 1 in accordance with a preferred embodiment of the present utility model;

FIG. 3 is a perspective view (with the housing broken away) of a pressure sensor according to a preferred embodiment of the present utility model;

FIG. 4 is a perspective view of a signal processing assembly according to a preferred embodiment of the present utility model;

FIG. 5 is a perspective view of a mounting base according to a preferred embodiment of the present utility model;

FIG. 6 is a perspective view of a mounting base from another perspective in accordance with a preferred embodiment of the present utility model;

in the figure: 1. a pressure joint; 100. a pressure channel; 101. a connecting pipe; 102. a small diameter section; 103. a large diameter section; 104. a horn mouth; 105. a support connection ring; 106. a flange; 107. a ring cavity; 108. a circumferential positioning portion; 109. stress isolation grooves; 110. a support step; 2. a pressure sensitive head; 201. a metal base; 202. a connecting cylinder; 203. a sensing cavity; 204. an elastic membrane; 3. an end button; 300. a neck; 301. a pressing flange; 302. the first material reducing blind hole; 303. a guide post; 304. a pressing part; 305. a holding cavity; 4. a mounting base; 400. a mounting cavity; 401. pressing a cylinder; 402. a receiving groove; 403. a first buckle; 404. disassembling the hole; 405. a yielding port; 407. a second flexible board arrangement groove; 408. a guide groove; 409. riveting a column; 411. a first flexible board arrangement groove; 412. a second buckle; 413. a circumferential positioning guide; 414. an operation port; 415. a notch; 416. a second material reducing blind hole; 417. a bottom plate; 418. a top plate; 5. a signal processing component; 501. a longitudinal plate; 502. a cross plate; 503. a first flexible board; 504. a second flexible board; 505. a second conductive connection portion; 506. a first conductive connection; 507. a fourth conductive connection portion; 508. a guide hole; 509. riveting holes; 510. a third conductive connection; 511. an electronic component; 6. an electrical connection; 601. a transition section; 7. a housing; 701. an end plate;

Detailed Description

The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. The following examples are illustrative only and are not to be construed as limiting the utility model. In the following description, the same reference numerals are used to designate the same or equivalent elements, and duplicate descriptions are omitted.

In the description of the present utility model, it should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "inner", "outer", "left", "right", etc. are based on the directions or positional relationships shown in the drawings, or the directions or positional relationships conventionally put in place when the inventive product is used, or the directions or positional relationships conventionally understood by those skilled in the art are merely for convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific direction, be configured and operated in a specific direction, and therefore should not be construed as limiting the present utility model.

In addition, the terms "mounted," "connected," "coupled," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood as appropriate by those of ordinary skill in the art.

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

As shown in fig. 1 to 3. The pressure sensor of the present embodiment uses a pressure measurement assembly including a pressure joint 1 and a pressure sensitive head 2. In which a pressure channel 100 extending longitudinally (i.e. up and down in the drawing) is provided in the pressure joint 1. The longitudinally distal (i.e. lower in the drawing) side of the pressure sensitive head 2 is recessed inwardly to form a connecting cylinder 202 having a distally facing sensing chamber 203, and the longitudinally proximal side of the pressure sensitive head 2 is correspondingly formed with an elastic diaphragm 204. The longitudinal proximal side surface of the elastic diaphragm 204 is provided with a pressure measurement circuit. The proximal end of the connection barrel 202 is sealingly connected to the pressure fitting 1 such that the proximal end of the pressure channel 100 communicates to the sensing lumen 203. The distal end of the pressure fitting 1 is provided with a connection tube 101 to be connected to a container or pipe to be measured or the like. The sides of the pressure joint 1 may be provided with concave or straight circumferential positioning portions 108. Preferably, the pressure measuring circuit is composed of a thick film piezoresistor.

Wherein the proximal end of the coupling barrel 202 is welded (e.g., laser welded) to the pressure fitting 1. The pressure measuring assembly of the embodiment realizes the partial isolation of the assembly stress of the pressure joint during the installation by arranging the pressure joint 1 and the pressure sensitive head 2 into a split structure and connecting the two structures into a whole through welding.

In other embodiments, the longitudinal proximal end of the pressure fitting 1 and its proximal end portion preferably protrude laterally outward to form a flange 106 and a support connection ring 105, respectively. The connecting tube 202 is sleeved on the flange 106 in a matching way. And is supported and welded to the support connection ring 105. Flange 106, support ring 105 and coupling barrel 202 enclose a ring cavity 107.

In this way, the welding slag which is crashed can be intensively contained through the annular cavity during welding, so that the pressure channel is prevented from being blocked by the welding slag.

Wherein the proximal end of the pressure channel 100 may be tapered to form a flare 104 in order to facilitate fluid flow from the sensing chamber when measuring the pressure of the fluid.

In the above embodiments, the pressure channel 100 may be formed by connecting the small diameter section 102 on the proximal side with the large diameter section 103 on the distal side, so as to facilitate the entry of the pressure fluid into the sensing chamber 203.

The pressure sensor in a preferred embodiment of the present utility model comprises, in addition to the above-mentioned pressure measuring assembly, a housing 7, a terminal 3, a mounting 4 and a signal processing assembly 5. Wherein the housing 7 comprises a longitudinally extending cartridge housing having a distal end sealingly connected to the pressure fitting 1 and a longitudinally proximal blocking end plate 701 of the cartridge housing. The end button 3 is fixedly connected to the end plate 701, for example, the neck 300 may be formed at the longitudinal middle of the end button 3, and the neck 300 may be passed through a via hole formed in the end plate 701, so that the end button 3 is firmly fixed during injection molding. The end button 3, the housing 7 and the pressure fitting 1 enclose a mounting cavity 400. The mounting seat 4 and the signal processing component 5 are both arranged in the mounting cavity 400. The signal processing assembly 5 is disposed on the mount 4 and is electrically connected to the pressure measurement circuit. The signal after being processed by the signal processing assembly 5 is output outwards through a plurality of electric connectors 6, and one end of each electric connector 6 is connected to the signal processing assembly 5 after penetrating the end button 3 and the end plate 701 inwards. The proximal end of the end knob 3 may be provided with a plurality of longitudinally extending first blind relief holes 302.

The signal processing component 5 may include 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, which are sequentially connected, wherein the transverse plate 502, the longitudinal plate 501 and the first conductive connection portion 506 are sequentially arranged from near to far. The first conductive connection 506 and the pressure measurement circuit may be electrically connected by soldering (as shown by solder joint 515 in fig. 2). Wherein the electronic component 511 (e.g., conditioning chip, etc.) may be disposed on the vertical board 501. The arrangement can control the transverse size of the pressure sensor to be small, so that the pressure sensor can be conveniently applied to a small space (such as a plurality of sensor concentrated installation modules on an automobile); and simultaneously, the measuring circuit which is required to be transversely arranged can be well and conveniently connected with the vertical plate 501, so that the difficulty in the existing bonding connection process is avoided. These difficulties manifest themselves in that the two ends of the wire, either aluminum or gold, of the bonding process should be parallel and fall within 1mm, otherwise bonding can only be performed using specially tailored devices, especially when the surfaces of the two connection points are perpendicular or even non-parallel, and it is difficult to efficiently and accurately accomplish bonding even with specially tailored devices.

Please refer to fig. 4 to fig. 6 in combination. In order to reliably mount the signal processing module 5, the mounting base 4 is formed with a receiving groove 402 for receiving the vertical plate 501, and a top plate 418 and a semicircular bottom plate 417 are formed at the proximal and distal ends thereof. The cross plate 502 is supportably secured to the proximal surface of the top plate 418. The bottom plate 417 partially plugs into a platen 401 proximal end. The distal end of the barrel 401 is pressed against a support step 110 formed on the pressure fitting 1. A stress isolation groove 109 is formed between the support step 110 and the support connection ring 105 to further isolate the mounting stress of the pressure joint 1. The two lateral sides of the accommodating groove 402 are respectively provided with at least one first buckle 403 which is clamped on the longitudinal plate 501, so that the widely used glue bonding process in the prior art is avoided, and the production efficiency is improved. Wherein, a disassembling hole 404 extending along the parallel direction of the second flexible board arrangement groove 407 may be provided on the sidewall of the pressing cylinder 401, and the disassembling hole 404 extends to the bottom of the accommodating groove 402, so as to facilitate the disassembly of the longitudinal board 501 in the accommodating groove 402. The side of the bottom plate 417 is provided with a relief opening 405 extending to the bottom plate 417 for the second flexible plate 504 to pass through. A proximal side of the base plate 417 is provided with a second flexible plate arrangement groove 407 which is laterally connected to the relief port 405. The side of the mounting seat 4 facing away from the receiving slot 402 may be provided with a plurality of second blind relief holes 416.

The side portion of the top plate 418 is opened with a first flexible plate arrangement slot 411 extending longitudinally and communicating to the receiving slot 402 toward the distal end side. The first flexible board arrangement slot 411 and the relief port 405 are located at the same position in the circumferential direction of the mount 4. At least two standoff posts 409 are provided at the proximal end of the top plate 418. The rivet pin 409 is riveted to a corresponding rivet hole 509 in the cross plate 502 toward the proximal end. In other embodiments, the cross plate 502 may be secured to the mounting base 4 by other means, such as a ring of compression flanges 301 extending longitudinally distally from the distal end of the knob 3 to compress distally against the mounting base 4.

The proximal surface of the cross plate 502 is provided with a plurality of fourth conductive connections 507. The electrical connector 6 is an elastic member, such as a conductive spring, and its distal end can be electrically contacted to the fourth conductive connection portion 507 after penetrating the terminal 3 and the end plate 701. Preferably, the electrical connector 6 is a conductive spring having two sections with different coiled outer diameters, a tapered transition section 601 is formed between the two sections, a holding cavity 305 for accommodating the conductive spring 6 is correspondingly formed on the terminal 3, the holding cavity 305 has a pressing portion 304, and the pressing portion 304 presses the transition section 601 against the fourth conductive connector 507 toward the distal end.

In other embodiments, the knob 3 preferably protrudes distally to form the post 303. The guide post 303 is cooperatively inserted into a guide slot 408 formed in the mounting base 4. An operation opening 414 for giving out an operation space for soldering is formed in a side wall of the mounting seat 4 opposite to the giving-out opening 405. The distal edge of the operation port 414 may be recessed toward the distal side 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. This allows the mounting seat 4 and the pressure-sensitive head 2 to be easily fixed. The pressing cylinder 401 may be protruded or recessed inwards to form a circumferential positioning guiding portion 413, and correspondingly, a guiding groove matched with the circumferential positioning guiding portion 413 may be formed on the metal base 201.

In other embodiments, it is preferable that the side of the transverse plate 502 is provided with a third conductive connection 510. The side portion of the second flexible board 504 is provided with a second conductive connection portion 505. The second conductive connection portion 505 is electrically connected to the metal housing 7 or the pressure contact 1 via a ground path embedded in the mount 4 and then grounded. The third conductive connection 510 is grounded via the housing 7.

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

Claims (10)

1. A pressure measurement assembly, comprising:

a pressure joint (1) in which a longitudinally extending pressure channel (100) is provided;

the pressure sensitive head (2) is provided with a connecting tube (202) which is provided with a distally-facing sensing cavity (203) and is recessed inwards on one side of the longitudinal far end, an elastic diaphragm (204) is correspondingly formed on one side of the longitudinal near end of the connecting tube, a pressure measuring circuit is arranged on the surface of one side of the longitudinal near end of the elastic diaphragm (204), and the near end of the connecting tube (202) is in sealing connection with the pressure joint (1) so as to enable the near end of the pressure channel (100) to be communicated with the sensing cavity (203);

wherein the proximal end of the connecting tube (202) is welded with the pressure joint (1).

2. The pressure measurement assembly according to claim 1, wherein the longitudinal proximal end of the pressure joint (1) and the proximal end thereof respectively protrude outwards and transversely to form a flange (106) and a supporting connection ring (105), and the connection tube (202) is sleeved on the flange (106) in a matching manner and is supported and welded on the supporting connection ring (105); the flange (106), the support connecting ring (105) and the connecting cylinder (202) enclose an annular cavity (107).

3. The pressure measurement assembly of claim 1, wherein the proximal inner diameter of the pressure channel (100) gradually expands to form a flare (104).

4. A pressure sensor, comprising:

a pressure measurement assembly according to any one of claims 1 to 3;

a housing (7) comprising a longitudinally extending cartridge housing having a distal end sealingly connected to the pressure fitting (1) and a longitudinally proximal end-blocking end plate (701) of the cartridge housing;

the end button (3) is fixedly connected to the end plate (701), and a mounting cavity (400) is formed by surrounding the end button (3), the shell (7) and the pressure joint (1);

the mounting seat (4) and the signal processing component (5) are arranged in the mounting cavity (400), and the signal processing component (5) is arranged on the mounting seat (4) and is electrically connected to the pressure measuring circuit;

and a plurality of electrical connectors (6) having one end thereof inserted through the terminal button (3) and the end plate (701) and electrically connected to the signal processing module (5).

5. The pressure sensor of claim 4, wherein the signal processing assembly (5) comprises a cross plate (502), a first flexible plate (503), a vertical plate (501), a second flexible plate (504) and a first conductive connection (506) connected in sequence, and the cross plate (502), the vertical plate (501) and the first conductive connection (506) are arranged in sequence from near to far; the first conductive connection (506) is electrically connected to the pressure measurement circuit.

6. The pressure sensor of claim 5, wherein the mounting base (4) extends longitudinally and has sides recessed inwardly to form a receiving slot (402) for receiving the longitudinal plate (501), and has proximal and distal ends facing each other to form a top plate (418) and a semicircular bottom plate (417); a cross plate (502) supported and secured 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 supporting step (110) formed on the pressure joint (1); at least one first buckle (403) clamped on the longitudinal plate (501) is arranged on each lateral side of the accommodating groove (402).

7. The pressure sensor of claim 6, wherein a side of the base plate (417) is provided with a relief opening (405) extending to the base plate (417) for the second flexible plate (504) to pass through; a second flexible board arrangement groove (407) which is transversely communicated with the abdication port (405) is arranged on one side of the proximal end of the bottom plate (417).

8. The pressure sensor according to claim 7, characterized in that the side of the top plate (418) is provided with a first flexible plate arrangement groove (411) extending longitudinally and communicating to the receiving groove (402) toward the distal end side, the first flexible plate arrangement groove (411) and the relief opening (405) being located at the same position in the circumferential direction of the mounting seat (4); the proximal end of the top plate (418) is provided with at least two riveting columns (409), and the riveting columns (409) are riveted on corresponding riveting holes (509) on the transverse plate (502) towards one side of the proximal end.

9. The pressure sensor according to claim 5, characterized in that the proximal surface of the diaphragm (502) is provided with a plurality of fourth electrically conductive connections (507); the electric connecting piece (6) is an elastic piece, and the far end of the electric connecting piece is electrically contacted with the fourth conductive connecting part (507) after penetrating through the end button (3) and the end plate (701).

10. Pressure sensor according to claim 4, characterized in that the mounting base (4) is provided with a second catch (412) for the snap-in metal base (201).

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