CN218994600U - Pressure sensor - Google Patents

Abstract

A pressure sensor, comprising: a pressure joint, in which a longitudinally extending pressure channel is arranged; the pressure sensitive head is provided with a connecting cylinder which is provided with a sensing cavity facing to the far end, one side of the longitudinal far end of the pressure sensitive head is inwards sunken to form a connecting cylinder which is provided with a sensing cavity facing to the far end, one side of the longitudinal near end of the pressure sensitive head is correspondingly provided with an elastic diaphragm, and the near end of the connecting cylinder is in sealing connection with the pressure joint so as to enable the near end of the pressure channel to be communicated with the sensing cavity; the lower outer edge of the pressure joint protrudes outwards and beyond the periphery of the pressure sensitive head to form an assembly flange, and the assembly flange, the shell and the pressure joint are surrounded to form an end button and the shell of the installation cavity; the mounting seat and the signal processing component are arranged in the mounting cavity, and the signal processing component is arranged on the mounting seat; the mounting seat is provided with a pressing cylinder with a distal end propped against the pressure joint; the assembly flange is propped against the inner wall of the pressure cylinder on the transverse plane, and a gap is reserved between the periphery of the pressure sensitive head and the pressure cylinder. The pressure sensor can isolate the elastic diaphragm of the pressure sensitive head from other elements to avoid measurement deviation.

Description

Pressure sensor

Technical Field

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

Background

The air suspension is an important component of an automobile vibration reduction system, and the core of the air suspension is an air spring. The pressure of the air spring can be controlled through the compressor and the valve, and the pressure of the air spring is monitored through the pressure sensor so as to adapt to different road conditions and driving habits. The pressure sensor for an air suspension vibrates more widely than the vehicle body, thus easily causing the sensor's parts to be not firmly bonded/adhered, especially when the circuit board and the support member are pressed/adhered for the purpose of higher manufacturing efficiency, rather than being completely fixed. In addition, the housing of the pressure sensor may have problems in terms of tightness when connected to the end button, and on the other hand, there is a need for a high requirement for the longitudinal dimensions of the housing and the components within the housing.

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 sensor that reduces the size requirements of the housing during assembly and ensures tightness between the housing and the end button.

In order to achieve the above purpose, the present utility model provides the following technical solutions: a pressure sensor, comprising:

a pressure joint, in which a longitudinally extending pressure channel is arranged;

the pressure sensitive head is provided with a connecting cylinder which is provided with a sensing cavity facing to the distal end side and is recessed inwards at one side of the longitudinal distal end, an elastic diaphragm is correspondingly formed at one side of the longitudinal proximal end of the connecting cylinder, a pressure measuring circuit is arranged on the surface of one side of the longitudinal proximal end of the elastic diaphragm, and the proximal end of the connecting cylinder is in sealing connection with the pressure joint so that the proximal end of the pressure channel is communicated with the sensing cavity;

the shell comprises a barrel shell which extends longitudinally and is connected to the pressure joint in a sealing way at the far end, and a circle of pressing edge which is formed by vertically folding the longitudinal near end of the barrel shell inwards; the distal end of the housing is sealingly connected to the pressure fitting; a compression area is formed on the periphery of the proximal end of the end button, and a sealing ring is arranged at the compression area; the signal processing assembly is provided with a circuit board which is electrically connected with the pressure measuring circuit; the pressing edge presses the sealing ring, the end button, the circuit board and the supporting seat on the pressure joint in sequence towards the far end; and a plurality of electric connecting pieces which penetrate through the terminal buttons and are electrically connected to the circuit board.

Preferably, the circuit board is connected to the pressure measurement circuit by a flexible board.

Preferably, the proximal end of the supporting seat protrudes outwards to form a plurality of groups of clamping feet, the distal end of the end button correspondingly forms a plurality of first bayonets, and each group of clamping feet is correspondingly clamped in the first bayonets.

Preferably, each group of clamping feet comprises two clamping feet which are adjacently arranged in the circumferential direction of the supporting seat, and the two clamping feet of each group are respectively abutted on the side wall of the corresponding side of the corresponding first bayonet in the circumferential direction after being deformed flexibly.

Preferably, the circuit board is connected with a second electric connection part, and the outer end of the second electric connection part is electrically contacted with the metal shell towards one side of the far end; a passing gap for the second electric connection part to pass through is reserved between two clamping pins of one group of clamping pins.

Preferably, the clamping pins comprise longitudinally extending base parts and protruding parts formed by protruding the proximal ends of the base parts towards the back sides of the clamping pins in the same group in a transverse mode, the back sides of the protruding parts of the two clamping pins in the same group are abutted against first bayonets correspondingly arranged on the end buttons, and the back sides of the base parts of the two clamping pins in the same group are abutted against second bayonets correspondingly arranged on the circuit board.

Preferably, the distal end of the protrusion abuts on the proximal end face of the circuit board toward the distal end side.

Preferably, a gap is left between the periphery of the pressure sensitive head and the pressure cylinder.

Preferably, the longitudinal proximal end of the pressure joint and the part close to 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 end surface of the circuit board is provided with a plurality of first electrical connections; the electric connecting piece is a conductive spring, and the far end of the electric connecting piece is electrically contacted with the circuit board after penetrating through the end button.

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 of a pressure sensor (with the housing and support base removed) according to a preferred embodiment of the present utility model;

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

FIG. 5 is a perspective view of a support base according to 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; 105. a support connection ring; 106. a flange; 107. a ring cavity; 108. positioning the notch; 109. stress isolation grooves; 110. a support step; 111a, a second positioning ring; 111b, a first positioning ring; 112. a first longitudinal positioning groove; 113. a flat side; 114. a pressure measurement circuit; 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; 301. a second longitudinal positioning groove; 302. a positioning concave part; 304. a pressing part; 305. a holding cavity; 306. a compression zone; 307. a second bayonet; 4. a support base; 400. a mounting cavity; 401. pressing a cylinder; 402a, a first clip leg; 402b, a second clamping leg; 403. passing through the gap; 405. a relief groove; 406. a second relief port; 407. a receiving chamber; 308. a cavity; 409. a first relief port; 410. a through port; 411. longitudinally positioning the ribs; 412. a cross plate; 413. a base; 414. a protrusion; 5. a signal processing component; 500. a circuit board; 501. a flexible board; 502. a third electrical connection; 503. a first electrical connection; 504. a conditioning element; 505. a second electrical connection; 506a, a first bayonet; 506b, a first bayonet; 6. an electrical connection; 601. a transition section; 7. a housing; 701. a cartridge housing; 702. edge pressing; 8. a seal ring;

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. 2. 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 114. 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 fitting 1 may be provided with positioning structures, such as positioning notches 108 or straight edges 113, for connection with the vessel or pipe of the fluid to be measured, to facilitate circumferential positioning with the pipe or vessel to be measured when connected.

Preferably, the pressure measurement circuit 114 includes an insulating layer covering the proximal surface of the flexible diaphragm 204 and a Wheatstone bridge composed of measurement elements (e.g., thick film piezoresistors, or strain gauges) disposed on the surface of the insulating layer.

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 preferably projects laterally outward to form a flange 106, and the proximal portion of the pressure fitting 1 projects laterally outward to form a support connection ring 105. The connecting tube 202 is sleeved on the flange 106 in a matching way, and is supported and welded on the supporting connecting 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.

In other embodiments, the inner diameter of the proximal end of the pressure channel 100 may be gradually enlarged to form a flare (not shown) in order to facilitate fluid flow from within the sensing lumen when measuring the pressure of the fluid.

In the above embodiments, the pressure channel 100 may be a stepped hole with sequentially increasing diameters from the proximal and distal holes, for example, a small diameter section 102 on the proximal side may be connected to a large diameter section 103 on the distal side, so that the pressure fluid may enter the sensing chamber 203.

Please refer to fig. 1, 3-4 in combination. 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 support 4 and a signal processing assembly 5. Wherein the housing 7 comprises a longitudinally extending cartridge housing 701 having a distal end sealingly connected to the pressure fitting 1 and a ring of beads 702 formed by a vertical inward folding of the longitudinal proximal end of the cartridge housing 701. The pressing edge 202 presses against a pressed area 306 (e.g., a stepped surface) formed on the periphery of the terminal button 3 toward the distal end side, thereby pressing the terminal button 3, the circuit board 500, and the support base 4 in order against the pressure joint 1. Preferably, the compression area 306 is provided with the sealing ring 8, that is, the pressing edge 202 compresses the sealing ring 8, the end button 3, the circuit board 500 and the supporting seat 4 on the pressure connector 1 in sequence towards one side of the distal end, so that the tightness between the proximal end of the housing 7 and the end button 3 can be enhanced, and meanwhile, the requirement of the matching tolerance between the housing 7 and the end button 3 can be reduced, so that the assembly is more convenient.

The distal end of the cartridge 701 abuts and is welded to the pressure fitting 1 on the distal side. The end button 3, the housing 7 and the pressure fitting 1 enclose a mounting cavity 400. The supporting seat 4 and the signal processing component 5 are both disposed in the mounting cavity 400. The signal processing assembly 5 is disposed on the support base 4 and is electrically connected to the pressure measurement circuit 114. The signal after being processed by the signal processing component 5 is output outwards through a plurality of electric connecting pieces 6, and one end of each electric connecting piece 6 is electrically connected to the signal processing component 5 after penetrating through the end button 3 towards the distal end side.

The signal processing assembly 5 includes a circuit board 500 transversely disposed on a proximal side of the support base 4, and electronic components such as a conditioning component 504 are disposed on a distal side of the circuit board 500. The circuit board 500 is connected (e.g., soldered) to the pressure measurement circuit 114 by a third electrical connection 502 provided on the flexible board 501. The proximal side of the conditioning element 504 is provided with a plurality of first electrical connections 503.

The pressure sensor of the present embodiment further includes a plurality of (four in the drawing and in rectangular distribution) electrical connectors 6 for outputting signals obtained by processing by the signal processing unit 5 to an external device. The electrical connection member 6 may be an elastic member, such as a conductive spring, and the distal end thereof may be pressed against and electrically contacted with the first electrical connection portion 503 after passing through the end knob 3. 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 corresponding tapered pressing portion 304, and the pressing portion 304 presses the transition section 601 against the first electrical connection portion 503 towards the distal end side.

Please refer to fig. 5. The support base 4 comprises a press cylinder 401, and the press cylinder 401 is sealed and welded on a support step 110 formed on the pressure joint 1 towards the distal end side. A transverse plate 412 is arranged at the proximal end of the inner cavity of the pressure cylinder 401 to strengthen the structural strength of the supporting seat 4; meanwhile, the transverse plate 412 and the proximal end of the platen 401 enclose a receiving cavity 407 that can receive electronic components on the circuit board 500. The transverse plate 412 is provided with a first yielding port 409 through which the flexible plate 501 can pass, and the pressing cylinder 401 is provided with a second yielding port 406 through which the flexible plate 501 can pass. The inner wall of the proximal end of the supporting seat 4 may be recessed inwards to form a relief groove 405 for avoiding the third electrical connection portion 502. Two through holes 410 are respectively arranged on two opposite side walls of the circumference of the pressing cylinder 401, so that the material use of the supporting seat 4 is reduced while the strength requirement is met. The through opening 410 may be circumferentially offset from the second relief opening 406.

In other embodiments, it is preferable that the two circumferentially opposite positions of the terminal 3 are each shrunk inwards and the circuit board 500 is surrounded by the cavity 308, so that the electronic component on the surface of the proximal side of the circuit board 500 can be disposed in the cavity 308, and the proximal middle of the terminal 3 is pressed against the proximal end face of the circuit board 500, so that the arrangement space of the electronic component can be reserved while the arrangement requirement of the electrical connector 6 is satisfied.

In order to facilitate positioning and reliable connection between the terminal 3, the circuit board 500 and the support base 4, the proximal end of the support base 4 protrudes outwards (i.e. on the proximal side) to form a group of two first clamping legs 402a and another group of two first clamping legs 402b. The distal end of the end knob 3 is formed with a first bayonet 506a and a first bayonet 506b which are circumferentially opposite to each other. The two first pins 402a are correspondingly clamped in the first bayonets 506a, and the two first pins 402b are correspondingly clamped in the first bayonets 506 a. The two first clamping legs 402a are respectively deformed by flexibility and then circumferentially abutted to the side wall of the circumferential corresponding side of the corresponding first bayonet.

In other embodiments, a second electrical connection 505 is preferably connected to the circuit board 500. The outer end of the second electrical connection portion 505 is electrically contacted to the metal housing 7 toward the distal end side, thereby facilitating grounding through the housing 7. A passing gap 403 is left between the two second pins 402b for the second electrical connection portion 505 to pass through.

In other embodiments, the first prongs 402b, 402a may each preferably comprise a longitudinally extending base and a tab 414 formed by a proximal end of the base 413 projecting laterally away from the opposite side of the same set of prongs. The opposite sides of the protruding parts 414 of the two clamping legs of the same group are abutted against the corresponding first bayonets of the end button 3. The opposite sides of the base 413 of the two clamping legs in the same group are abutted against the corresponding second bayonets 307 on the circuit board 500. Thus, the clip legs can clip the circuit board 500 through the base and clip the terminal button 3 through the protrusion 414, thereby making the connection more firm. Preferably, the distal end of the protrusion 414 abuts against the proximal end surface of the circuit board 500 toward the distal end, so that the circuit board 500 is prevented from being separated from the proximal end surface of the support base 4 toward the distal end.

In other embodiments, it is preferable that the lower peripheral edge of the support connection ring 105 may protrude outward to form the upper and lower spaced second positioning rings 111a and the first positioning ring 111b. The second positioning ring 111a and the first positioning ring 111b are sleeved at the bottom and the lower part of the inner cavity of the pressing cylinder 401 in a matching way. A stress isolation groove 109 is formed between the first positioning ring 111b and the second positioning ring 111 a. This allows for the mating positioning of the platen 401 at the bottom and lower portion, respectively.

In other embodiments, it is preferable that a gap is left between the periphery of the metal base 201 and the platen 401. In this way, the deviation of the measurement result caused by the contact of the supporting base 4 with the metal base 201 can be avoided.

In other embodiments, preferably, in order to facilitate positioning between the pressure connector 1 and the support seat 4, a first longitudinal positioning groove 112 may be disposed on the periphery of the second positioning ring 111a, and a longitudinal positioning rib 411 may be correspondingly disposed on the inner wall of the pressure cylinder 401 of the support seat 4, where the longitudinal positioning rib 411 is cooperatively disposed in the first longitudinal positioning groove 112. In order to facilitate the connection and positioning between the terminal 3 and the external device, the proximal center of the terminal 3 may be provided with a positioning recess 302, and the outer wall may be provided with a plurality of second longitudinal positioning grooves 301. The second longitudinal positioning groove 301 is disposed between two circumferentially adjacent electrical connectors 6.

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 sensor, comprising:

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

a pressure sensitive head (2), the longitudinal distal end side of which is recessed inwards to form a connecting cylinder (202) with a sensing cavity (203) facing the distal end side, the longitudinal proximal end side of which is correspondingly formed with an elastic diaphragm (204), the surface of the longitudinal proximal end side of the elastic diaphragm (204) is provided with a pressure measuring circuit (114), and the proximal end of the connecting cylinder (202) is in sealing connection with the pressure joint (1) so as to enable the proximal end of the pressure channel (100) to be communicated with the sensing cavity (203);

a terminal button (3) and a shell (7) which form a mounting cavity (400) together with the pressure joint (1), wherein the shell (7) comprises a barrel shell (701) which extends longitudinally and is connected with the pressure joint (1) in a sealing way at the far end, and a circle of pressing edge (702) which is formed by vertically folding the longitudinal near end of the barrel shell (701) towards the inner side; the distal end of the housing (7) is sealingly connected to the pressure fitting (1); a compression area (306) is formed on the periphery of the proximal end of the end button (3), and a sealing ring (8) is arranged at the compression area (306); the support seat (4) and the signal processing assembly (5) are arranged in the mounting cavity (400), the signal processing assembly (5) is provided with a circuit board (500), and the circuit board (500) is electrically connected with the pressure measuring circuit (114); the pressing edge (702) sequentially presses the sealing ring (8), the end button (3), the circuit board (500) and the supporting seat (4) on the pressure joint (1) towards the far end; and a plurality of electrical connectors (6) which are electrically connected to the circuit board (500) after penetrating the terminal buttons (3).

2. The pressure sensor of claim 1, wherein the circuit board (500) is connected to the pressure measurement circuit (114) through a flexible board (501).

3. The pressure sensor according to claim 1, wherein the proximal end of the support base (4) protrudes outwards to form a plurality of groups of clamping legs, the distal end of the end button (3) correspondingly forms a plurality of first bayonets, and each group of clamping legs is correspondingly clamped in the first bayonets.

4. A pressure sensor according to claim 3, wherein each set of clamping feet comprises two clamping feet adjacently arranged in the circumferential direction of the supporting seat (4), and the two clamping feet of each set are respectively abutted on the side wall of the corresponding circumferential side of the corresponding first bayonet in the circumferential direction after being deformed in a flexible manner.

5. The pressure sensor according to claim 4, wherein a second electrical connection portion (505) is connected to the circuit board (500), and an outer end of the second electrical connection portion (505) is electrically contacted to the metal housing (7) toward the distal end side; a passing gap (403) for the second electric connection part (505) to pass through is reserved between two clamping pins of one group of clamping pins.

6. The pressure sensor of claim 5, wherein the clamping legs comprise a longitudinally extending base and a protrusion (414) formed by the proximal end of the base (413) protruding transversely away from the opposite side of the clamping legs of the same group, wherein the opposite sides of the protrusions (414) of the two clamping legs of the same group are abutted against corresponding first bayonets of the end button (3), and the opposite sides of the base (413) of the two clamping legs of the same group are abutted against corresponding second bayonets (307) of the circuit board (500).

7. The pressure sensor of claim 6, wherein the distal end of the tab (414) abuts on the proximal end face of the circuit board (500) on a distal side.

8. A pressure sensor according to claim 1, characterized in that a gap is left between the periphery of the pressure sensitive head (2) and the pressure cylinder (401).

9. The pressure sensor 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 matched 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).

10. The pressure sensor of claim 5, wherein a proximal surface of the circuit board (500) is provided with a plurality of first electrical connections (503); the electric connecting piece (6) is a conductive spring, and the far end of the electric connecting piece is electrically contacted with the circuit board (500) after penetrating through the end button (3).

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