CN216791486U

CN216791486U - Differential pressure detector

Info

Publication number: CN216791486U
Application number: CN202123360985.3U
Authority: CN
Inventors: 赵青龙; 李梦维; 曾金华; 肖艳; 熊艳
Original assignee: Hubei Fugui Automation Technology Co ltd
Current assignee: Hubei Fugui Automation Technology Co ltd
Priority date: 2021-12-28
Filing date: 2021-12-28
Publication date: 2022-06-21
Anticipated expiration: 2031-12-28

Abstract

The utility model discloses a differential pressure detector, belonging to the technical field of differential pressure detection, comprising: the pressure detection main part and with two pressure measurement probe that two sense terminals of pressure detection main part are connected, every pressure measurement probe all includes determine module and seal assembly. The detection assembly comprises a connecting pipe, a pressure diaphragm and a threaded cap; the sealing assembly comprises a mounting pipe, a sealing block and an adjusting piece, one end of the mounting pipe is attached to the connecting pipe, an external thread sleeve which is in threaded connection and matched with the threaded cap is arranged on the outer surface of one end, close to the connecting pipe, of the mounting pipe, the sealing block is arranged on one side of the sealing cavity and can slide into the sealing cavity to seal the mounting pipe, and the adjusting piece is connected with the sealing block and is used for driving the sealing block to slide to the sealing cavity; the utility model can obstruct the medium in the measured pipeline and avoid the pressure diaphragm from loosening caused by long-term pressure, and the connecting pipe provided with the pressure diaphragm can be detached from the mounting pipe communicated with the medium, so as to avoid the pressure diaphragm from contacting the high-temperature medium in a large area for a long time.

Description

Differential pressure detector

Technical Field

The utility model relates to the technical field of differential pressure detection, in particular to a differential pressure detector.

Background

In a pressure system such as a pipeline system, it is usually necessary to detect a pressure difference between two points to determine whether the pressures of the two points are balanced or whether a certain magnitude relationship is satisfied.

The publication No. CN201281643Y provides a diaphragm-sealed differential pressure transmitter, in which a pressure measuring probe is mounted to a pipe to be measured in a working state or an idle state, and a pressure diaphragm in the pressure measuring probe keeps large-area contact with a high-temperature medium for a long time, after a long time, the elasticity of the pressure diaphragm is weakened and becomes loose, thereby shortening the service life of the detecting device and reducing the measurement accuracy of the detecting device.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the technical defects and provide a pressure difference detector, which solves the technical problems that a pressure diaphragm of a pressure difference detection device in the prior art is contacted with a high-temperature medium for a long time and the elasticity of the pressure diaphragm is weakened and becomes loose.

In order to achieve the above technical object, the technical solution of the present invention provides a pressure difference detector, including: pressure measurement main part and with two pressure measurement probe that two detection end connection of pressure measurement main part, every pressure measurement probe all includes:

the detection assembly comprises a connecting pipe, a pressure membrane and a threaded cap, the connecting pipe is provided with a connecting end and an installation end, the connecting end is connected with the pressure detection main body, the installation end is provided with an installation groove, the pressure membrane is embedded in the installation groove, the threaded cap slides on the outer peripheral surface of the connecting pipe, and one end of the threaded cap, close to the installation end of the connecting pipe, protrudes out of the installation end;

seal assembly, seal assembly is including installation pipe, seal block and regulating part, installation pipe one end paste in the connecting pipe, and its surface that is close to connecting pipe one end be equipped with screw cap threaded connection complex external screw thread cover, the installation intraductal with the position department that the installation pipe corresponds forms a sealed chamber, seal block is located one side in sealed chamber and can slide extremely sealed intracavity is used for sealing the installation pipe, the regulating part with seal block links to each other and is used for the sealed block of drive to slide extremely sealed chamber.

As a further improvement of the utility model, two capillaries are respectively led out from the positive chamber and the negative chamber of the lower part of the pressure detection main body, and one end of each capillary, which is far away from the pressure detection main body, is connected with the connecting pipe.

As a further improvement of the utility model, a support body is arranged at the position of the outer surface of the mounting tube corresponding to the sealing block, a sliding cavity is formed in the support body, and the sealing block slides in the sliding cavity.

As a further improvement of the utility model, the adjusting part comprises a stud, an adjusting handle, a piston and a connecting rod, the stud is in threaded connection with the supporting body, one end of the stud is connected with the adjusting handle, the other end of the stud is in rotary connection with the piston, one end of the connecting rod is connected with the piston, the other end of the connecting rod is connected with the sealing block, the piston is in sliding connection with a sliding cavity of the supporting body, and two third sealing rings are respectively embedded on two sides of the peripheral surface of the piston.

As a further improvement of the utility model, a first sealing ring is sleeved on the outer peripheral surface of the sealing block, a limiting ring is arranged in the mounting pipe at a position corresponding to the sealing cavity, a second sealing ring is embedded in the limiting ring, and the inner surface of the second sealing ring is matched with the outer surface of the first sealing ring.

As a further improvement of the utility model, the outer diameter of one end, close to the mounting pipe, of the connecting pipe is larger than that of the other end, away from the mounting pipe, of the connecting pipe, and the threaded cap slides on the outer peripheral surface of the connecting pipe with the smaller outer diameter.

As a further improvement of the utility model, the outer diameter of the connecting tube near the end of the mounting tube is smaller than the inner diameter of the screw cap.

As a further improvement of the utility model, one end of the connecting pipe close to the mounting pipe is provided with a first sealing gasket, and one end of the mounting pipe close to the connecting pipe is provided with a second sealing gasket.

As a further improvement of the utility model, one end of the outer peripheral surface of the external thread sleeve, which is far away from the thread cap, is sequentially provided with a lock washer and a lock nut respectively.

As a further improvement of the utility model, one end of the installation pipe, which is far away from the connecting pipe, is connected with an installation flange.

Compared with the prior art, the utility model has the beneficial effects that: through the seal assembly who sets up, make seal assembly's regulating part can drive sealed piece and slide to sealed chamber, the realization is sealed with the installation pipe, with the separation by the medium in the pipeline under test, avoid the long-term pressurized of pressure diaphragm and relax, the determine module of its cooperation setting, when the pressure measurement main part does not use, the accessible is with screw cap screw thread cover of screwing out, can lift the connecting pipe of installing the pressure diaphragm off on the installation pipe with the pipeline intercommunication under test, in order to avoid the long-term large tracts of land contact high temperature medium of pressure diaphragm, detection device's life and measurement accuracy have been improved.

Drawings

FIG. 1 is a schematic view of the overall front cross-sectional structure of the present invention;

FIG. 2 is a schematic view of the front cross-sectional structure of the pressure measuring probe of the present invention;

FIG. 3 is an enlarged schematic view of the structure at A in FIG. 2;

fig. 4 is a schematic structural view of the front view of the pressure measuring probe of the present invention.

In the figure: 1. a pressure detection main body; 11. a capillary tube; 2. a pressure measuring probe; 21. a detection component; 211. a connecting pipe; 2111. mounting grooves; 2112. a first gasket; 212. a pressure diaphragm; 213. a threaded cap; 22. a seal assembly; 221. installing a pipe; 2211. an external thread sleeve; 2212. sealing the cavity; 2213. a second gasket; 222. a sealing block; 2221. a first seal ring; 223. an adjustment member; 2231. a stud; 2232. an adjusting handle; 2233. a piston; 2233a, a third sealing ring; 2234. a connecting rod; 224. a support body; 2241. a sliding cavity; 225. a limiting ring; 2251. a second seal ring; 226. a lock washer; 227. locking the nut; 3. and (7) mounting a flange.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the utility model and are not intended to limit the utility model.

As shown in fig. 1 and 2, the present invention provides a differential pressure detector, including: the pressure detection device comprises a pressure detection main body 1 and two pressure measurement probes 2 connected with two detection ends of the pressure detection main body 1, wherein each pressure measurement probe 2 comprises a detection assembly 21 and a sealing assembly 22; two capillary tubes 11 are respectively led out from the positive chamber and the negative chamber of the lower part of the pressure detection main body 1, and one end of each capillary tube 11 departing from the pressure detection main body 1 is connected with a connecting tube 211; when in use, the two pressure measuring probes 2 respectively detect the pressure in two different positions of the fluid pipeline and obtain pressure difference; the sealing assembly 22 is used for sealing the pipeline to be tested when the pressure diaphragm 212 is replaced, and the detection assembly 21 can be detached from the sealing assembly 22, so that the pressure diaphragm 212 can be replaced conveniently.

As shown in fig. 1, 2 and 3, the detecting assembly 21 includes a connecting tube 211, a pressure diaphragm 212 and a screw cap 213, the connecting tube 211 has a connecting end and a mounting end, the connecting end is connected to the pressure detecting body 1, the mounting end is provided with a mounting groove 2111, the pressure diaphragm 212 is embedded in the mounting groove 2111, and the screw cap 213 slides on the outer circumferential surface of the connecting tube 211, and one end of the screw cap close to the mounting end of the connecting tube 211 protrudes out of the mounting end.

As shown in fig. 1 and 2, the sealing assembly 22 includes a mounting tube 221, a sealing block 222, and an adjusting member 223, wherein one end of the mounting tube 221 is attached to the connecting tube 211, and an external thread sleeve 2211 that is screwed with the thread cap 213 is disposed on an outer surface of one end of the mounting tube 221, a sealing cavity 2212 is formed in a position corresponding to the mounting tube 221 inside the mounting tube 221, the sealing block 222 is disposed on one side of the sealing cavity 2212 and can slide into the sealing cavity 2212 to seal the mounting tube 221, and the adjusting member 223 is connected to the sealing block 222 to drive the sealing block 222 to slide into the sealing cavity 2212.

In the device, a pressure diaphragm 212 is embedded in a mounting groove 2111, and each pressure measuring probe 2 is deformed through the pressure diaphragm 212 to drive high-temperature silicon oil in a capillary tube 11 to flow and further transmit the pressure to a pressure detection main body 1, so that differential pressure detection is realized; through the arrangement of the adjusting piece 223 and the sealing block 222, the adjusting piece 223 can drive the sealing block 222 to slide into the sealing cavity 2212, so that the sealing block 222 can seal the mounting pipe 221, further, a tested pipeline connected with the mounting pipe 221 can be sealed, and when the device is idle, the sealing block 222 can be used for plugging the mounting pipe 221, so that the pressure diaphragm 212 is prevented from being loosened due to long-term pressure; because the threaded cap 213 slides on the outer peripheral surface of the connection tube 211 and one end of the threaded cap 213 close to the mounting end of the connection tube 211 protrudes out of the mounting end, the outer surface of the mounting tube 221 close to one end of the connection tube 211 is provided with the external threaded sleeve 2211 which is in threaded connection with the threaded cap 213, so that the external threaded sleeve 2211 can be screwed into the threaded cap 213, the connection tube 211 and the mounting tube 221 are connected with the external threaded sleeve 2211 through the threaded cap 213, in addition, the threaded cap 213 can be separated from the external threaded sleeve 2211 when the external threaded sleeve 2211 is screwed out, so that the connection tube 211 can be operated to be separated from the mounting tube 221 through the threaded cap 213 and the external threaded sleeve 2211, and the pressure diaphragm 212 is prevented from contacting high-temperature media in a large area for a long time.

As shown in fig. 2, a supporting body 224 is arranged at a position on the outer surface of the installation tube 221 corresponding to the sealing block 222, a sliding cavity 2241 is formed inside the supporting body 224, the sealing block 222 slides in the sliding cavity 2241, and the sealing block 222 is fixed and limited by the arranged supporting body 224, and in the device, the supporting body 224 is tightly connected with the installation tube 221 to avoid medium leakage;

the adjusting member 223 comprises a stud 2231, an adjusting handle 2232, a piston 2233 and a connecting rod 2234, the stud 2231 is screwed with the supporting body 224, one end of the stud 2231 is connected with the adjusting handle 2232, the other end is rotatably connected with the piston 2233, one end of the connecting rod 2234 is connected with the piston 2233, the other end is connected with the sealing block 222, the piston 2233 is slidably connected with a sliding cavity 2241 of the supporting body 224, two third sealing rings 2233a are respectively embedded on two sides of the outer peripheral surface of the piston 2233, specifically, the adjusting handle 2232 is located outside the supporting body 224, the adjusting handle 2232 is used to drive the stud 2231 to rotate and screw into the supporting body 224, so as to drive the piston 2233 and the connecting rod 2234 to move towards one end close to the sealing block 222, thereby driving the sealing block 222 to enter the sealing cavity 2212, the third sealing ring 2233a is used to increase the damping force of the sealing ring 2233, and prevent the sealing block 222 or the adjusting member 223 from loosening during sealing, meanwhile, the sealing performance of the support body 224 and the installation pipe 221 is improved;

the outer peripheral face of sealing block 222 is equipped with a first sealing washer 2221, the position department that corresponds with sealed chamber 2212 in the installation pipe 221 is equipped with a spacing collar 225, spacing collar 225 embeds and is equipped with a second sealing washer 2251, the internal surface of second sealing washer 2251 agrees with mutually with the surface of first sealing washer 2221, in this device, when sealing block 222 entered sealed chamber 2212, its peripheral face supported the inner peripheral surface of spacing collar 225, the surface of first sealing washer 2221 supported the internal surface of second sealing washer 2251 this moment, has improved sealed effect.

As shown in fig. 3, the outer diameter of the end of the connecting tube 211 close to the mounting tube 221 is larger than the outer diameter of the end of the connecting tube 211 away from the mounting tube 221, the screw cap 213 slides on the outer peripheral surface of the connecting tube 211 with a smaller outer diameter, and by making the outer diameter of the end of the connecting tube 211 close to the mounting tube 221 larger than the outer diameter of the end of the connecting tube 211 away from the mounting tube 221, the screw cap 213 slides on the outer peripheral surface of the connecting tube 211 with a smaller outer diameter, so that the end of the connecting tube 211 with a larger outer diameter can limit the screw cap 213, and the screw cap 213 is prevented from separating from the connecting tube 211, which is convenient for use;

the outer diameter of the end of the connecting pipe 211 close to the mounting pipe 221 is smaller than the inner diameter of the screw cap 213, and the outer diameter of the end of the connecting pipe 211 close to the mounting pipe 221 is smaller than the inner diameter of the screw cap 213, so that the connecting pipe can be conveniently mounted through the screw cap 213;

the first sealing gasket 2112 is arranged at one end, close to the mounting pipe 221, of the connecting pipe 211, the second sealing gasket 2213 is arranged at one end, close to the connecting pipe 211, of the mounting pipe 221, and through the first sealing gasket 2112 and the second sealing gasket 2213, when the mounting pipe 221 is mounted on the connecting pipe 211, the first sealing gasket 2112 and the second sealing gasket 2213 are pressed together, so that the sealing effect of the joint of the connecting pipe 211 and the mounting pipe 221 is improved.

As shown in fig. 4, one end of the outer circumferential surface of the external thread sleeve 2211, which is away from the thread cap 213, is sequentially provided with a lock washer 226 and a lock nut 227, respectively, in the present device, the lock washer 226 is matched with the lock nut 227 to perform the functions of pre-tightening and locking the external thread sleeve 2211;

the one end that installation pipe 221 deviates from connecting pipe 211 is connected with mounting flange 3, and through the mounting flange 3 that sets up, the device of being convenient for passes through mounting flange 3 and installs pressure measurement probe 2.

The working principle is as follows: before use, firstly, the two pressure measuring probes 2 are respectively arranged on a fluid pipeline by using the mounting flange 3, in an initial state of the device, the mounting pipe 221 is connected with the connecting pipe 211 and can be directly used, when the pressure detection main body 1 is not used, the adjusting handle 2232 is used for driving the stud 2231 to rotate and screw into the supporting body 224, so that the piston 2233 and the connecting rod 2234 are driven to move towards one end close to the sealing block 222, the sealing block 222 is driven to enter the sealing cavity 2212, the mounting pipe 221 is sealed, then the threaded cap 213 is rotated until the external threaded sleeve 2211 is screwed out from the inside of the mounting pipe, the connecting pipe 211 can be detached, when the device is required to be used, the connecting pipe 211 is butted with the mounting pipe 221, the threaded cap 213 is reversed, the external threaded sleeve 2211 is screwed into the inside of the mounting pipe, and the first sealing gasket 2112 on the connecting pipe 211 is tightly abutted to the second sealing gasket 2213 on the mounting pipe 221.

According to the utility model, through the arranged sealing assembly 22, the adjusting piece 223 of the sealing assembly 22 can drive the sealing block 222 to slide to the sealing cavity 2212, so that the mounting pipe 221 is sealed to block media in a measured pipeline, the pressure diaphragm 212 is prevented from being pressed for a long time and loosened, the detection assembly 21 is arranged in a matched manner, when the pressure detection main body 1 is not used, the threaded cap 213 can be screwed out of the external thread sleeve 2211, the connecting pipe 211 provided with the pressure diaphragm 212 is detached from the mounting pipe 221 communicated with the measured pipeline, so that the pressure diaphragm 212 is prevented from contacting high-temperature media in a large area for a long time, and the service life and the measurement accuracy of the detection device are improved.

The above-described embodiments of the present invention should not be construed as limiting the scope of the present invention. Any other corresponding changes and modifications made according to the technical idea of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A differential pressure detector is characterized in that: the method comprises the following steps: pressure measurement main part and with two pressure measurement probe that two detection end of pressure measurement main part are connected, every pressure measurement probe all includes:

2. The differential pressure detector according to claim 1, wherein two capillaries are respectively led out from the positive and negative chambers at the lower part of the pressure detecting body, and one end of each capillary, which is far away from the pressure detecting body, is connected with the connecting pipe.

3. The differential pressure detector according to claim 1, wherein a support is disposed on an outer surface of the mounting tube at a position corresponding to the sealing block, a sliding cavity is formed inside the support, and the sealing block slides in the sliding cavity.

4. The differential pressure detector according to claim 3, wherein the adjusting member comprises a stud, an adjusting handle, a piston and a connecting rod, the stud is in threaded connection with the support body, one end of the stud is connected with the adjusting handle, the other end of the stud is rotatably connected with the piston, one end of the connecting rod is connected with the piston, the other end of the connecting rod is connected with the sealing block, the piston is slidably connected with the sliding cavity of the support body, and two third sealing rings are respectively embedded in two sides of the outer peripheral surface of the piston.

5. The differential pressure detector according to claim 1, wherein a first seal ring is sleeved on an outer peripheral surface of the seal block, a limiting ring is arranged at a position corresponding to the seal cavity in the installation pipe, a second seal ring is embedded in the limiting ring, and an inner surface of the second seal ring is fitted with an outer surface of the first seal ring.

6. The differential pressure measuring instrument according to claim 1, wherein an outer diameter of the connection pipe at an end close to the mounting pipe is larger than an outer diameter of the connection pipe at an end away from the mounting pipe, and the screw cap slides on an outer peripheral surface of the connection pipe having a smaller outer diameter.

7. The differential pressure gauge of claim 1, wherein the outer diameter of the connecting tube near the end of the mounting tube is smaller than the inner diameter of the threaded cap.

8. The differential pressure gauge according to claim 1, wherein the connecting tube has a first gasket disposed at an end thereof adjacent to the mounting tube, and a second gasket disposed at an end thereof adjacent to the connecting tube.

9. The differential pressure detector according to claim 1, wherein an end of the outer circumferential surface of the external thread sleeve facing away from the threaded cap is sequentially provided with a lock washer and a lock nut, respectively.

10. The differential pressure detector of claim 1, wherein a mounting flange is coupled to an end of the mounting tube opposite the connecting tube.