CN110940455A

CN110940455A - Flat membrane pressure transmitter

Info

Publication number: CN110940455A
Application number: CN201911291331.4A
Authority: CN
Inventors: 张小芹
Original assignee: Xi'an Xipai Measurement And Control Technology Co Ltd
Current assignee: Xi'an Xipai Measurement And Control Technology Co Ltd
Priority date: 2019-12-16
Filing date: 2019-12-16
Publication date: 2020-03-31

Abstract

The invention discloses a flat membrane pressure transmitter, which comprises a pressure transmitter main body, wherein a membrane is fixedly arranged at the bottom end of the pressure transmitter main body, a buffer protection mechanism is arranged in the pressure transmitter main body, a cover protection mechanism is fixedly connected to one side wall of the membrane, a groove is formed in the middle of the inner wall of one side of the pressure transmitter main body, a self-resetting press switch is fixedly arranged on the inner wall of the groove, the buffer protection mechanism comprises a movable cylinder and a fixed cylinder, the top end of the fixed cylinder is fixedly connected with the inner wall of the top end of the pressure transmitter main body, the bottom of the fixed cylinder is movably and alternately connected with the top of the movable cylinder, and a push ring is fixedly connected to the bottom end of the movable cylinder. The service life of the pressure transmitter is greatly prolonged.

Description

Flat membrane pressure transmitter

Technical Field

The invention relates to a pressure transmitter, in particular to a flat membrane pressure transmitter.

Background

The pressure transmitter is a pressure sensor which takes output as a standard signal, and is an instrument which receives a pressure variable and converts the pressure variable into a standard output signal in proportion. The pressure sensor can convert physical pressure parameters of gas, liquid and the like sensed by the side pressure element sensor into standard electric signals so as to supply the standard electric signals to secondary instruments such as an indicating alarm instrument, a recorder, a regulator and the like for measurement, indication and process regulation. The pressure transmitter is the most common sensor in industrial practice, is widely applied to various industrial automatic control environments, and relates to various 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 view of the above, chinese patent No. CN208060077U proposes a flat membrane pressure transmitter, which effectively protects the membrane from damage by buffering the elastic force generated by the extension of the first spring and the pressure exerted by the medium; chinese patent No. CN208872460U proposes a flat membrane type pressure transmitter, compress the silica gel conducting layer through the diaphragm and then conduct to the sensor core, the impact of high-speed high-pressure liquid to the sensor core has been avoided, and the pressure transmitter in the above patent, although buffer structure has been designed, buffer structure is comparatively complicated, it is higher to maintain the degree of difficulty, and pressure transmitter's diaphragm is in the extrusion that lasts high-pressure medium, long-time deformation leads to permanent deformation easily, consequently, the detection accuracy that leads to the diaphragm descends, it is comparatively troublesome and the replacement cost is higher to maintain.

Disclosure of Invention

The invention aims to provide a flat-membrane pressure transmitter to solve the problems that the flat-membrane pressure transmitter is difficult to recover after being extruded and deformed by a medium for a long time, the detection accuracy is low and a membrane is easy to damage in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme:

the utility model provides a flat membrane pressure transmitter, includes the pressure transmitter main part, the bottom fixed mounting of pressure transmitter main part has the diaphragm, the inside of pressure transmitter main part is equipped with buffering protection machanism, a lateral wall fixedly connected with of diaphragm covers protection machanism, the middle part of pressure transmitter main part one side inner wall is cut a groove, the inner wall fixed mounting of recess has from reset press switch.

Preferably, the buffering protection mechanism comprises a movable cylinder and a fixed cylinder, the top end of the fixed cylinder is fixedly connected with the inner wall of the top end of the pressure transmitter main body, and the bottom of the fixed cylinder is movably inserted and connected with the top of the movable cylinder.

Preferably, the bottom end of the movable cylinder is fixedly connected with a pushing ring, the top of the outer side wall of the movable cylinder is fixedly connected with a movable ring, and the top end of the movable ring is uniformly and fixedly connected with a plurality of compression springs.

Preferably, the middle part of the outer side wall of the fixed cylinder is fixedly connected with a fixed ring, and the top ends of the compression springs are respectively and fixedly connected with the bottom end of the fixed ring.

Preferably, it includes mounting panel and apron to cover protection mechanism, a lateral wall of mounting panel and a lateral wall fixed connection of diaphragm, the middle part fixed mounting of mounting panel has the motor, the motor is through self-resetting press switch and power electric connection.

Preferably, an output shaft of the motor is rotatably connected with a connecting plate, one end of the connecting plate is fixedly connected with one side wall of the cover plate, and one side wall of the diaphragm is fixedly connected with a limiting rod.

Compared with the prior art, the invention has the beneficial effects that:

1. the buffer protection mechanism is arranged, so that the pressure on the diaphragm can be counteracted and buffered, the deformation degree of the diaphragm is reduced, the diaphragm cannot be damaged by the pressure applied by a medium, and the service life of the pressure transmitter is greatly prolonged.

2. The invention is provided with the covering protection mechanism, and can automatically trigger the cover plate to cover and protect the detection port of the diaphragm when the pressure applied by the medium is continuously too high, so that the diaphragm cannot be damaged due to continuous deformation, and the emergency protection is carried out on the diaphragm.

Drawings

FIG. 1 is a cross-sectional view of the present invention;

FIG. 2 is a schematic view of the structure at A in FIG. 1;

FIG. 3 is a top view of the loose ring portion of the present invention;

fig. 4 is a bottom view of the cover portion of the present invention.

In the figure: 1. a pressure transmitter body; 2. a movable barrel; 3. a push ring; 4. a movable ring; 5. a fixing ring; 6. a fixed cylinder; 7. a motor; 8. mounting a plate; 9. a connecting plate; 10. a cover plate; 11. a compression spring; 12. a groove; 13. a self-resetting push switch; 14. a membrane; 15. a limiting rod.

Detailed Description

In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", "both ends", "one end", "the other end", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "disposed," "connected," and the like are to be construed broadly, such as "connected," which may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The first embodiment is as follows:

as shown in fig. 1-3, the pressure transmitter comprises a pressure transmitter body 1, a diaphragm 14 is fixedly mounted at the bottom end of the pressure transmitter body 1, a buffering protection mechanism is arranged inside the pressure transmitter body 1, a side wall of the diaphragm 14 is fixedly connected with a covering protection mechanism, a groove 12 is cut in the middle of an inner wall of one side of the pressure transmitter body 1, a self-resetting press switch 13 is fixedly mounted on the inner wall of the groove 12, the buffering protection mechanism comprises a movable cylinder 2 and a fixed cylinder 6, the top end of the fixed cylinder 6 is fixedly connected with the inner wall of the top end of the pressure transmitter body 1, the bottom of the fixed cylinder 6 is movably inserted and connected with the top of the movable cylinder 2, a pushing ring 3 is fixedly connected at the bottom end of the movable cylinder 2, a movable ring 4 is fixedly connected at the top of the outer side wall of the movable cylinder 2, a plurality of compression springs 11 are uniformly, offset, cushion the pressure that receives diaphragm 14 to protect diaphragm 14, prevent that diaphragm 14 from warping excessively, the solid fixed ring 5 of middle part fixedly connected with of solid fixed tube 6 lateral wall, a plurality of compression spring 11's top respectively with solid fixed ring 5's bottom fixed connection.

Example two:

on the basis of the first embodiment, as shown in fig. 1 and 4, the covering protection mechanism includes a mounting plate 8 and a cover plate 10, a side wall of the mounting plate 8 is fixedly connected with a side wall of a diaphragm 14, a motor 7 is fixedly mounted in the middle of the mounting plate 8, the motor 7 is electrically connected with a power supply through a self-resetting press switch 13, an output shaft of the motor 7 is rotatably connected with a connecting plate 9, one end of the connecting plate 9 is fixedly connected with a side wall of the cover plate 10, a side wall of the diaphragm 14 is fixedly connected with a limiting rod 15, when the medium applying pressure is continuously too high, the self-resetting press switch 13 is opened by moving and extruding the movable ring 4, so that the output shaft of the motor 7 drives the cover plate 10 to rotate, the cover plate 10 covers a detection port of the diaphragm 14, the medium applying pressure is isolated from the diaphragm 14, and the diaphragm.

It should be noted that, in the stage of installing and using the pressure transmitter main body 1, the diaphragm 14 is deformed after being pushed by pressure, when the pressure value is too large, the deformation degree of the diaphragm 14 becomes large, when the deformation is gradually enlarged, the push ring 3 is pushed to move upwards, so as to drive the movable cylinder 2 to move upwards along the fixed cylinder 6, and in the process of moving the movable cylinder 2 upwards, the compression spring 11 is driven to compress, so that the return elastic force of the compression spring 11 can counteract and buffer the pressure received by the diaphragm 14, so as to protect the diaphragm 14, when the pressure received by the diaphragm 14 reaches the critical value, the movable ring 4 can move upwards gradually to reach the groove 12, the movable ring 4 can press the self-reset press switch 13 inside the groove 12, so that the self-reset press switch 13 is turned on, the motor 7 starts to work, the output shaft of the motor 7 rotates, thereby drive the rotation of apron 10 through connecting plate 9, make apron 10 rotatory to diaphragm 14 under (during normal use state, one side of diaphragm 14 bottom is arranged in to apron 10), gag lever post 15 can block the continuation removal of apron 10, make apron 10 stay under diaphragm 14, apron 10 can shelter from the protection to diaphragm 14 like this, reduce the further extrusion damage of high-pressure environment to diaphragm 14, after detecting the ambient pressure and reduce, activity ring 4 descends, thereby activity ring 4 moves away recess 12 department, from the bounce of reset press switch 13 and close, motor 7 stall, the operator can be manual dial apron 10 from diaphragm 14 under can.

The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims

1. A flat membrane pressure transmitter, includes pressure transmitter main part (1), its characterized in that: the bottom fixed mounting of pressure transmitter main part (1) has diaphragm (14), the inside of pressure transmitter main part (1) is equipped with buffering protection machanism, a lateral wall fixedly connected with of diaphragm (14) covers protection machanism, the middle part of pressure transmitter main part (1) one side inner wall is cut a groove (12), the inner wall fixed mounting of groove (12) has from formula push switch (13) that resets.

2. The flat diaphragm pressure transmitter of claim 1 wherein: buffering protection machanism includes a movable section of thick bamboo (2) and a fixed section of thick bamboo (6), the top of a fixed section of thick bamboo (6) and the top inner wall fixed connection of pressure transmitter main part (1), the bottom of a fixed section of thick bamboo (6) and the top activity interlude of a movable section of thick bamboo (2) are connected.

3. The flat diaphragm pressure transmitter of claim 2 wherein: the bottom fixedly connected with of a movable section of thick bamboo (2) pushes away ring (3), the top fixedly connected with of a movable section of thick bamboo (2) lateral wall activity ring (4), the even fixedly connected with a plurality of compression spring (11) in top of activity ring (4).

4. The flat diaphragm pressure transmitter of claim 3 wherein: the middle part of the outer side wall of the fixed cylinder (6) is fixedly connected with a fixed ring (5) and a plurality of compression springs (11) are fixedly connected with the bottom ends of the fixed ring (5) respectively.

5. The flat diaphragm pressure transmitter of claim 1 wherein: cover protection mechanism and include mounting panel (8) and apron (10), a lateral wall of mounting panel (8) and a lateral wall fixed connection of diaphragm (14), the middle part fixed mounting of mounting panel (8) has motor (7), motor (7) are through pressing switch (13) and power electric connection from the reset type.

6. The flat diaphragm pressure transmitter of claim 5 wherein: an output shaft of the motor (7) is rotatably connected with a connecting plate (9), one end of the connecting plate (9) is fixedly connected with one side wall of the cover plate (10), and one side wall of the diaphragm (14) is fixedly connected with a limiting rod (15).