CN211347170U

CN211347170U - Pressure sensor

Info

Publication number: CN211347170U
Application number: CN201922234076.1U
Authority: CN
Inventors: 张建华
Original assignee: Suzhou Bestman Automation Equipment Co Ltd
Current assignee: Suzhou Bestman Automation Equipment Co Ltd
Priority date: 2019-12-13
Filing date: 2019-12-13
Publication date: 2020-08-25
Anticipated expiration: 2029-12-13

Abstract

The utility model discloses a pressure sensor relates to pressure sensor technical field, including shell, lower diaphragm, lower rubber circle, bottom, pressure sensing element, tensioning spring, atress board, clamp plate, roof, go up diaphragm and last rubber circle. The detachable shell top that is fixed in of roof, the top and the bottom of shell are equipped with upper groove and low groove respectively, the bottom is fixed in the low groove, lower rubber ring is fixed in between the top of bottom and the tank bottom of low groove, lower diaphragm is fixed in lower rubber ring inner circle, pressure sensing element is fixed in lower diaphragm lower surface, it is fixed in the upper groove to go up the rubber ring, it is fixed in rubber ring inner circle to go up the diaphragm, the bottom of roof is fixed in the upper end of last rubber ring, the clamp plate is fixed in the lower surface of roof, spring and atress board all are located the central through-hole, the upper end of spring is fixed in the lower surface of atress board, the lower extreme of spring is. The utility model discloses can bear great pressure to convenient the dismantlement.

Description

Pressure sensor

Technical Field

The utility model relates to a pressure sensor technical field especially relates to a pressure sensor.

Background

A pressure sensor is a device or apparatus that senses a pressure signal and converts the pressure signal into a usable output electrical signal according to a certain rule. A pressure sensor is usually composed of a pressure sensitive element and a signal processing unit. Pressure sensors can be classified into gauge pressure sensors, differential pressure sensors, and absolute pressure sensors according to different types of test pressures. The pressure sensor is the most common sensor in industrial practice, is widely applied to various industrial automatic control environments, and relates to a plurality of industries such as water conservancy and hydropower, railway traffic, intelligent buildings, production automatic control, aerospace, military industry, petrochemical industry, oil wells, electric power, ships, machine tools, pipelines and the like.

In the prior art, the pressure sensor applied to the environment with higher pressure is generally used by applying the deformation of the diaphragm to the sensing element, but the diaphragm is easily broken when the pressure is too high, and the pressure sensor is difficult to maintain, so that the use is inconvenient.

Therefore, a new pressure sensor is urgently needed in the market to solve the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a pressure sensor for solve the technical problem who exists among the above-mentioned prior art, can bear higher pressure, can dismantle the maintenance of being convenient for.

In order to achieve the above object, the utility model provides a following scheme:

the utility model discloses a pressure sensor, which comprises a shell, a lower diaphragm, a lower rubber ring, a bottom cover, a pressure sensing element, a tensioning spring, a stress plate, a pressure plate, a top plate, an upper diaphragm and an upper rubber ring, wherein the shell is internally provided with a pressure reduction cavity, the top plate is detachably fixed on the top of the shell, the top and the bottom of the shell are respectively provided with an upper groove and a lower groove, the upper groove and the lower groove are communicated with the pressure reduction cavity, the bottom cover is fixed in the lower groove, the lower rubber ring is fixed between the top of the bottom cover and the bottom of the lower groove, the lower diaphragm is fixed on the inner ring of the lower rubber ring, the pressure sensing element is fixed on the lower surface of the lower diaphragm, the upper rubber ring is fixed in the upper groove, the upper diaphragm is fixed on the inner ring of the upper rubber ring, the bottom of the top plate is fixed on the upper end of the upper rubber ring, the middle of the top plate is provided with a central through hole, the pressing plate is fixed on the lower surface of the top plate, the pressing plate is located between the top plate and the upper diaphragm, the spring and the stress plate are located in the central through hole, the upper end of the spring is fixed on the lower surface of the stress plate, the lower end of the spring is fixed on the upper surface of the pressing plate, and the stress plate can slide relatively in the central through hole.

Preferably, the stress plate further comprises two sliding blocks, the two sliding blocks are respectively fixed on two sides of the stress plate, sliding grooves are formed in two sides of the central through hole, and the sliding blocks slide in the sliding grooves relatively.

Preferably, the positioning device further comprises two limiting blocks and two positioning rods, the two positioning rods are fixed to two sides of the upper surface of the pressing plate respectively, the lower end face of the top plate is provided with two positioning holes, the positioning rods are opposite to the positioning holes in position, and the limiting blocks are fixed to the upper ends of the positioning holes.

Preferably, the improved structure further comprises two bolts, threaded holes are formed in the two sides of the shell and the top plate, the threaded holes in the shell are opposite to the threaded holes in the top plate, and the bolts are sequentially in threaded connection with the threaded holes in the shell and the threaded holes in the top plate.

Preferably, still include the sealing washer, the shell is equipped with the seal groove, the seal groove is located the tank bottom department of upper groove, the sealing washer is located in the seal groove, the upper surface of sealing washer with the lower extreme of going up the rubber circle offsets.

Preferably, the inside of the decompression chamber is inert gas.

The utility model discloses for prior art gain following technological effect:

1. this pressure sensor, fix roof and shell through the screw bolt, then bear external force through the atress board, make it extrude tensioning spring downwards, extrude the upper diaphragm through tensioning spring and clamp plate, make it take place deformation, thereby oppress the inert gas in the decompression chamber, extrude lower rubber circle, thereby test through pressure sensor, the pressure that receives through tensioning spring balance atress board this moment, make this pressure sensor can measure bigger pressure, avoid its pressure to cause the diaphragm fracture when too big, thereby convenient to use has been reached, be convenient for maintain and the more elongated purpose in life-span.

2. This pressure sensor carries on spacingly through spout and slider to the atress board, avoids it to take place the skew at the in-process that reciprocates, through the locating lever, stopper and constant head tank carry on spacingly to the clamp plate, avoid it to take place the skew at the in-process that reciprocates, then make the screw bolt be connected more firm with the roof through the thread groove, seal up the shell through sealing washer and seal groove, avoid the gas leakage of decompression intracavity, through making it measure more accurately to the intracavity intussuseption inert gas that decompresses.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a pressure sensor according to the present embodiment;

FIG. 2 is an enlarged view of portion A of FIG. 1;

FIG. 3 is an enlarged view of the portion B of FIG. 1;

FIG. 4 is an enlarged view of the portion C of FIG. 1;

FIG. 5 is an enlarged view of the portion D of FIG. 1;

in the figure: 1. a housing; 2. a lower diaphragm; 3. a lower rubber ring; 4. a bottom cover; 5. a pressure sensing element; 6. a spring; 7. a stress plate; 8. a central through hole; 9. a chute; 10. pressing a plate; 11. a top plate; 12. a bolt; 13. an upper diaphragm; 14. mounting a rubber ring; 15. a seal ring; 16. a sealing groove; 17. an upper groove; 18. a slider; 19. positioning holes; 20. positioning a rod; 21. a limiting block; 22. a threaded hole; 23. a reduced pressure chamber.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.

As shown in fig. 1 to 5, the present embodiment provides a pressure sensor, which includes a housing 1, a lower diaphragm 2, a lower rubber ring 3, a bottom cover 4, a pressure sensing element 5, a tension spring 6, a stress plate 7, a pressure plate 10, a top plate, an upper diaphragm 13, and an upper rubber ring 14. The shell 1 is cylindrical, and the inner ring part is a decompression cavity 23. The top plate is detachably fixed on the top 11 of the shell 1, so that the maintenance is convenient. The top 11 and the bottom of the shell 1 are respectively provided with an upper groove 17 and a lower groove, and the inner ring of the shell 1 penetrates through the middle parts of the upper groove 17 and the lower groove, so that the upper groove 17 and the lower groove are both communicated with the decompression chamber 23. The bottom cover 4 is fixed in the lower groove in a welding mode, the lower rubber ring 3 is fixed between the top 11 of the bottom cover 4 and the bottom of the lower groove, and the lower diaphragm 2 is fixed on the inner ring of the lower rubber ring 3. The pressure sensing element 5 is fixed on the lower surface of the lower diaphragm 2, and the pressure sensing element 5 measures the actual pressure value through the deformation amount of the lower diaphragm 2. The upper rubber ring 14 is fixed in the upper groove 17, the upper diaphragm 13 is fixed on the inner ring of the upper rubber ring 14, and the bottom of the top plate is fixed on the upper end of the upper rubber ring 14. Roof middle part has central through-hole 8, clamp plate 10 is fixed in the lower surface of roof, clamp plate 10 is located between roof and the last diaphragm 13, spring 6 and atress board 7 all are located central through-hole 8, the upper end of spring 6 is fixed in the lower surface of atress board 7, the lower extreme of spring 6 is fixed in the upper surface of clamp plate 10, atress board 7 can be in central through-hole 8 relative slip, when atress board 7 receives pressure extrusion spring 6 downwards, spring 6 plays the effect of buffering, and can be with pressure evenly distributed to on the clamp plate 10, transmit for last diaphragm 13 by clamp plate 10 again, can effectively avoid great pressure directly to transmit for last diaphragm 13 and make the cracked problem of last diaphragm 13 like this.

When the pressure-bearing type diaphragm pressing device is used, the stress plate 7 in the central through hole 8 presses the spring 6 downwards after sensing pressure, the lower end of the spring 6 exerts pressure on the pressing plate 10 after the upper end of the spring is pressed, the area of the pressing plate 10 is large, pressure intensity is reduced, and the upper diaphragm 13 can be protected from being broken due to overlarge pressure intensity. When the upper diaphragm 13 deforms due to pressure, the gas in the decompression chamber 23 is pressed downwards, the gas continues to apply a pressure downwards to the lower diaphragm 2 after being compressed, and finally the pressure sensing element 5 measures a pressure value and transmits the pressure value.

In order to realize the stable relative sliding of the stress plate 7 in the central through hole 8, in this embodiment, the stress plate further includes two sliding blocks 18, the two sliding blocks 18 are respectively fixed on two sides of the stress plate 7, two sides of the central through hole 8 are provided with sliding grooves 9, and the sliding blocks 18 slide relatively in the sliding grooves 9. The sliding blocks 18 on the two sides of the stress plate 7 limit the stress plate, so that the stress plate 7 can be prevented from being deviated in the sliding process.

For convenience of installation, the present embodiment further includes two limiting blocks 21 and two positioning rods 20, the two positioning rods 20 are respectively fixed to two sides of the upper surface of the pressing plate 10, and those skilled in the art can design the positioning rods 20 and the pressing plate 10 into an integrated structure. The lower end face of the top plate is provided with two positioning holes 19, the positioning rods 20 are opposite to the positioning holes 19, and the technical effect of opposite positions can be achieved only by inserting the positioning rods 20 into the positioning holes 19 during installation. The limiting block 21 is welded and fixed at the upper end of the positioning hole 19, and the limiting block 21 plays a limiting role in limiting the positioning rod 20.

Further, the two bolts 12 are further included in the embodiment, the threaded holes 22 are formed in the two sides of the housing 1 and the top plate, the threaded holes 22 in the housing 1 are opposite to the threaded holes 22 in the top plate, and the bolts 12 are sequentially in threaded connection with the threaded holes 22 in the housing 1 and the threaded holes 22 in the top plate. The relative fixation of the housing 1 and the top plate is realized through the bolt 12, and the bolt 12 can be replaced by a screw by those skilled in the art as long as the technical effect of convenient disassembly can be realized.

In this embodiment, the sealing device further includes a sealing ring 15, the housing 1 is provided with a sealing groove 16, the sealing groove 16 is located at the groove bottom of the upper groove 17, the sealing ring 15 is located in the sealing groove 16, and the upper surface of the sealing ring 15 abuts against the lower end of the upper rubber ring 14. This arrangement can effectively prevent the escape of gas inside the decompression chamber 23.

Further, the inside of the decompression chamber 23 in this embodiment is inert gas, which can effectively prevent explosion.

The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the concrete implementation and the application scope. In summary, the content of the present specification should not be construed as a limitation of the present invention.

Claims

1. A pressure sensor, characterized by: the pressure sensor comprises a shell, a lower diaphragm, a lower rubber ring, a bottom cover, a pressure sensing element, a tensioning spring, a stress plate, a pressure plate, a top plate, an upper diaphragm and an upper rubber ring, wherein a pressure reducing cavity is arranged in the shell, the top plate is detachably fixed on the top of the shell, the top and the bottom of the shell are respectively provided with an upper groove and a lower groove, the upper groove and the lower groove are communicated with the pressure reducing cavity, the bottom cover is fixed in the lower groove, the lower rubber ring is fixed between the top of the bottom cover and the groove bottom of the lower groove, the lower diaphragm is fixed on the inner ring of the lower rubber ring, the pressure sensing element is fixed on the lower surface of the lower diaphragm, the upper rubber ring is fixed in the upper groove, the upper diaphragm is fixed on the inner ring of the upper rubber ring, and the bottom of the top plate is fixed on the upper end of the upper, the middle of the top plate is provided with a central through hole, the pressing plate is fixed on the lower surface of the top plate, the pressing plate is located between the top plate and the upper diaphragm, the spring and the stress plate are located in the central through hole, the upper end of the spring is fixed on the lower surface of the stress plate, the lower end of the spring is fixed on the upper surface of the pressing plate, and the stress plate can slide relatively in the central through hole.

2. The pressure sensor of claim 1, wherein: the two sliding blocks are respectively fixed on two sides of the stress plate, sliding grooves are formed in two sides of the central through hole, and the sliding blocks slide in the sliding grooves relatively.

3. The pressure sensor of claim 1, wherein: the positioning device is characterized by further comprising two limiting blocks and two positioning rods, the two positioning rods are respectively fixed on two sides of the upper surface of the pressing plate, the lower end face of the top plate is provided with two positioning holes, the positioning rods are opposite to the positioning holes in position, and the limiting blocks are fixed at the upper ends of the positioning holes.

4. The pressure sensor of claim 1, wherein: the screw-thread-hole-type portable terminal is characterized by further comprising two bolts, wherein threaded holes are formed in the two sides of the shell and the two sides of the top plate, the threaded holes in the shell and the threaded holes in the top plate are opposite, and the bolts are sequentially in threaded connection with the threaded holes in the shell and the threaded holes in the top plate.

5. The pressure sensor of claim 1, wherein: the sealing ring is positioned in the sealing groove, and the upper surface of the sealing ring is abutted to the lower end of the upper rubber ring.

6. The pressure sensor of claim 1, wherein: and inert gas is filled in the decompression cavity.