CN216483664U

CN216483664U - Differential pressure gauge with corrugated pipe

Info

Publication number: CN216483664U
Application number: CN202123445653.5U
Authority: CN
Inventors: 熊章华; 张兆峰; 张少华; 唐友政
Original assignee: Yichang Zhaofeng Automation Instr Co ltd China
Current assignee: Yichang Zhaofeng Automation Instr Co ltd China
Priority date: 2021-12-23
Filing date: 2021-12-23
Publication date: 2022-05-10
Anticipated expiration: 2031-12-23

Abstract

The utility model provides a take differential pressure gauge of bellows relates to the flowmeter field, including having airtight appearance chamber measure a section of thick bamboo, set firmly this measure a section of thick bamboo and hold the first bellows of intracavity and install flexure strip and core amplification mechanism outside this measure a section of thick bamboo, be equipped with on the measure a section of thick bamboo with the high-pressure channel that the inner chamber of first bellows is linked together and with the low pressure passageway that the inner chamber of measuring a section of thick bamboo is linked together, first bellows has airtight inner chamber, first bellows pass through the pressure sensing subassembly with the flexure strip links to each other so that the flexure strip perk, core amplification mechanism with the flexure strip links to each other in order to show the differential pressure. The problem that the pressure bearing capacity and the sensitivity of a double-bellows differential pressure gauge in the prior art cannot be considered is solved.

Description

Differential pressure gauge with corrugated pipe

Technical Field

The utility model belongs to the technical field of differential pressure detection technique and specifically relates to a take differential pressure gauge of bellows is related to.

Background

The differential pressure gauge is mainly used for measuring the differential pressure before and after the filter element body in the industries of filtration, purification and the like so as to judge the blocking degree of the filter element.

At present, a differential pressure gauge with two corrugated pipes is arranged on the market, and high-pressure gas and low-pressure gas are required to be respectively introduced into the two corrugated pipes when the differential pressure gauge is used; in order to ensure the accuracy of measurement, the pressure sensing areas of the two corrugated pipes are generally set to be equal, and when other conditions are the same, the pressure sensing areas of the corrugated pipes are in direct proportion to the square of the diameters of the corrugated pipes, but the pressure bearing capacity of the corrugated pipes is in negative correlation with the diameters of the corrugated pipes; if the pressure-bearing capacity of the two corrugated pipes with larger diameters is poor, and if the detection sensitivity of the two corrugated pipes with smaller diameters is low, the pressure-bearing capacity and the sensitivity of the existing double-corrugated-pipe differential pressure gauge cannot be considered.

SUMMERY OF THE UTILITY MODEL

To the not enough that exists among the prior art, the utility model provides a take differential pressure gauge of bellows, its bearing capacity and the problem that sensitivity can not compromise of having solved dual bellows differential pressure gauge among the prior art.

According to the utility model discloses an embodiment, a take differential pressure gauge of bellows, including having airtight appearance chamber the measuring cylinder, set firmly this measuring cylinder and hold the first bellows of intracavity and install flexure strip and core mechanism of amplification outside this measuring cylinder, be equipped with on the measuring cylinder with the high-pressure passage that the inner chamber of first bellows is linked together and with the low pressure passageway that the inner chamber of measuring cylinder is linked together, first bellows has airtight inner chamber, first bellows pass through the pressure sensing subassembly with the flexure strip links to each other so that the flexure strip perk, core mechanism of amplification with the flexure strip links to each other in order to show the differential pressure.

Compared with the prior art, the utility model discloses following beneficial effect has: when the device is used, high-pressure gas and low-pressure gas are respectively conveyed into the first corrugated pipe and the closed containing cavity of the measuring cylinder through the high-pressure channel and the low-pressure channel, and the first corrugated pipe is fixedly arranged in the measuring cylinder, so that the high pressure and the low pressure inside and outside the first corrugated pipe are mutually offset, and the first corrugated pipe only bears the differential pressure between the high pressure and the low pressure; the differential pressure drives the first corrugated pipe to extend upwards so as to tilt the elastic sheet and finally display the differential pressure through the movement amplifying mechanism; by adopting the scheme, when the first corrugated pipe with the larger diameter is selected, the pressure sensing area of the first corrugated pipe is increased, the sensitivity of the device is ensured, the bearing capacity of the first corrugated pipe is reduced, and the sensitivity and the bearing capacity are considered.

Drawings

Fig. 1 is a schematic view of the overall structure of the embodiment of the present invention.

In the above drawings: 1. a measuring cylinder; 101. a high pressure channel; 102. a low pressure channel; 103. an end cap; 104. a pressure sensing seat; 105. a barrel; 2. a first bellows; 3. an elastic sheet; 4. a movement amplifying mechanism; 5. a pressure sensing component; 501. a pressure sensing plate; 502. a connecting rod; 6. a second bellows; 7. a third bellows.

Detailed Description

The technical solution of the present invention will be further explained with reference to the accompanying drawings and embodiments.

As shown in fig. 1, a differential pressure gauge with a bellows comprises a measuring cylinder 1 having a sealed cavity, a first bellows 2 fixedly arranged in the cavity of the measuring cylinder 1, an elastic sheet 3 arranged outside the measuring cylinder 1, and a movement amplifying mechanism 4; specifically, the measuring cylinder 1 comprises end covers 103, a cylinder body 105 with openings at the upper end and the lower end, and an upper pressure sensing seat 104 and a lower pressure sensing seat 104 which are detachably connected to the two ends of the cylinder body 105, the number of the end covers 103 is two, and the end covers 103, the pressure sensing seats 104 and the cylinder body 105 are detachably connected to the middle of each pressure sensing seat 104 respectively, so that the components in the measuring cylinder 1 can be assembled and disassembled conveniently; it should be noted that the end cap 103, the pressure sensing seat 104 and the cylinder 105 all need to be provided with a conventional sealing structure to ensure that the inner cavity of the measuring cylinder 1 is sealed; each end cover 103 is provided with an air passage communicated with the outside.

The measuring cylinder 1 is provided with a high-pressure channel 101 communicated with the inner cavity of the first corrugated pipe 2 and a low-pressure channel 102 communicated with the inner cavity of the measuring cylinder 1, and the high-pressure channel 101 and the low-pressure channel 102 are both arranged on a lower pressure sensing seat 104; the first corrugated pipe 2 is provided with a closed inner cavity, and in order to conveniently realize the fixation and sealing of the corrugated pipe, the corrugated pipe in the specification takes a metal corrugated pipe as an example; the first corrugated pipe 2 is connected with the elastic sheet 3 through a pressure sensing assembly 5 so as to enable the elastic sheet 3 to tilt; the movement amplifying mechanism 4 is connected with the elastic sheet 3; when the pressure difference between high pressure and low pressure drives one end of the elastic sheet 3 to warp and displace, the elastic sheet 3 displaces to further push the movement amplifying mechanism 4 to display the pressure difference on the dial disc through a pointer; the specific structures of the movement magnifying mechanism 4, the dial, the pointer (not shown in the figure) and the specific connection mode with the elastic sheet 3 are the prior art, and the detailed description thereof is omitted here.

When the device is used, high-pressure gas and low-pressure gas are respectively conveyed into the closed containing cavities of the first corrugated pipe 2 and the measuring cylinder 1 through the high-pressure passage 101 and the low-pressure passage 102, and as the first corrugated pipe 2 is fixedly arranged in the measuring cylinder 1, the high pressure and the low pressure inside and outside the first corrugated pipe 2 are mutually counteracted, and the first corrugated pipe 2 only bears the differential pressure between the high pressure and the low pressure; the differential pressure drives the first corrugated pipe 2 to extend upwards so as to tilt the elastic sheet 3 and finally display the differential pressure through the movement amplifying mechanism 4; it can be seen that, by adopting the above scheme, when the first corrugated pipe 2 with a larger diameter is selected, the pressure sensing area of the first corrugated pipe 2 is increased, so that the sensitivity of the device is ensured, the bearing capacity of the first corrugated pipe 2 is reduced, and the sensitivity and the bearing capacity are considered.

As shown in fig. 1, the present invention provides another embodiment, wherein one end of the elastic sheet 3 is fixedly disposed on the measuring cylinder 1, the top end of the first bellows 2 is open, and the bottom end thereof is sealed and welded on the measuring cylinder 1; in order to conveniently communicate the high-pressure channel 101 with the inner cavity of the first corrugated pipe 2, the bottom end of the first corrugated pipe 2 may be open, and the high-pressure channel 101 is communicated to the bottom end of the first corrugated pipe 2 from below; the pressure sensing assembly 5 comprises a pressure sensing plate 501 and a connecting rod 502 fixedly arranged on the pressure sensing plate 501, in this embodiment, the pressure sensing plate 501 is made of metal, and the pressure sensing plate 501 is sealed and welded at one open end of the first corrugated pipe 2; high pressure and low pressure act on the pressure sensing plate 501, and in practice, the calculation of the pressure sensing area of the pressure sensing plate 501 is more convenient than the calculation of the pressure sensing area of the first corrugated pipe 2, so that the workload is reduced; the first bellows 2 and the connecting rod 502 are both arranged to be coaxial with the measuring cylinder 1 to ensure good symmetry and stress; the free end of the connecting rod 502 penetrates through the air passage of one of the end covers 103 and abuts against the middle part of the elastic sheet 3, the air passage limits the connecting rod 502 to swing freely, and the connecting rod 502 further plays a role in vertically guiding the pressure sensing plate 501 and the first corrugated pipe 2.

Further, the measuring device further comprises a second corrugated pipe 6 sleeved outside the connecting rod 502, the second corrugated pipe 6 is coaxial with the first corrugated pipe 2, two ends of the second corrugated pipe 6 are respectively sealed and welded on the measuring cylinder 1 and the pressure sensing plate 501 to seal the inner cavity of the measuring cylinder 1, and the second corrugated pipe 6 seals the inner cavity of the measuring cylinder 1, so that a dynamic sealing structure does not need to be arranged between the connecting rod 502 and the measuring cylinder 1 by adopting the technical scheme; in addition, the second corrugated pipe 6 enhances the guiding function of the first corrugated pipe 2, so that the first corrugated pipe 2 and the second corrugated pipe 6 only move in the vertical direction when stressed, and deflection is avoided; the inner cavity of the second corrugated pipe 6 is opposite to one of the air passages and communicated with the air passages, and in the compression process of the second corrugated pipe 6, the second corrugated pipe 6 discharges the gas in the inner cavity to the outside, so that the influence on the detection result is avoided.

Further, the measuring instrument further comprises a third bellows 7 sleeved in the first bellows 2, the third bellows 7 is coaxial with the first bellows 2, two ends of the third bellows 7 are respectively welded to the measuring cylinder 1 and the pressure sensing plate 501 in a sealing manner, and similarly, the third bellows 7 further enhances the guiding effect on the first bellows 2, so that each bellows only moves in the vertical direction when being stressed; in order to avoid the influence of the gas in the inner cavity of the third bellows 7 on the detection result, the inner cavity of the third bellows 7 is communicated with the other gas passage.

As shown in fig. 1, the present invention provides another embodiment, the diameters of the second bellows 6 and the third bellows 7 are smaller than the first bellows 2, and the second bellows 6 and the third bellows 7 with smaller diameters can bear larger pressure than the first bellows 2, in this embodiment, the diameters of the second bellows 6 and the third bellows 7 are equal; of course, the diameters of the second bellows 6 and the third bellows 7 may be different, and for example, the diameter of the third bellows 7 may be larger than the diameter of the second bellows 6 so that the third bellows 7 can receive the high pressure in the inner cavity of the first bellows 2.

As shown in fig. 1, the present invention provides another embodiment, the pressure sensing plate 501 includes a cylindrical body and a flange fixed on the side of the body, the flange is sealed and welded on the end surface of the first corrugated tube 2, the body is coaxial with the first corrugated tube 2 and inserted into the first corrugated tube 2 to reduce the axial dimension of the device and provide an installation space for the second corrugated tube 6, the initial lengths of the second corrugated tube 6 and the third corrugated tube 7 are equal, and the opposite ends are respectively sealed and fixed on the two sides of the body; the diameters and the initial lengths of the second corrugated pipe 6 and the third corrugated pipe 7 are equal, the symmetry of the differential pressure gauge is further improved, the stress of the corrugated pipes is more uniform, the corrugated pipes only can move vertically, and the differential pressure gauge is durable.

As shown in fig. 1, further, the body is attached to the inner wall of the first bellows 2, and the body is supported inside the first bellows 2 to further prevent the first bellows 2 from swinging.

Finally, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the present invention can be modified or replaced by other means without departing from the spirit and scope of the present invention, which should be construed as limited only by the appended claims.

Claims

1. A differential pressure gauge with a corrugated pipe is characterized in that: including having airtight measuring cylinder (1) that holds the chamber, setting firmly first bellows (2) and installing in this measuring cylinder (1) outer flexure strip (3) and core mechanism of amplification (4) of holding the intracavity in this measuring cylinder (1), be equipped with on measuring cylinder (1) with high-pressure channel (101) that the inner chamber of first bellows (2) is linked together and with low pressure passageway (102) that the inner chamber of measuring cylinder (1) is linked together, first bellows (2) have airtight inner chamber, first bellows (2) through pressure sensing subassembly (5) with flexure strip (3) link to each other so that flexure strip (3) perk, core mechanism of amplification (4) with flexure strip (3) link to each other in order to show the differential pressure.

2. A differential pressure gauge with bellows according to claim 1, wherein: one end of the elastic piece (3) is fixedly arranged on the measuring cylinder (1), one end of the first corrugated pipe (2) is open, the other end of the first corrugated pipe is sealed and fixedly arranged on the measuring cylinder (1), the pressure sensing assembly (5) comprises a pressure sensing plate (501) and a connecting rod (502) fixedly arranged on the pressure sensing plate (501), the pressure sensing plate (501) is fixedly connected with the open end of the first corrugated pipe (2), and the free end of the connecting rod (502) penetrates out of the measuring cylinder (1) and abuts against the elastic piece (3).

3. A differential pressure gauge with bellows according to claim 2, wherein: the measuring instrument is characterized by further comprising a second corrugated pipe (6) sleeved outside the connecting rod (502), two ends of the second corrugated pipe (6) are fixedly arranged on the measuring cylinder (1) and the pressure sensing plate (501) in a sealing mode respectively, and the inner cavity of the second corrugated pipe (6) is communicated with the outside.

4. A differential pressure gauge with bellows according to claim 3, wherein: the measuring device is characterized by further comprising a third corrugated pipe (7) sleeved in the first corrugated pipe (2), two ends of the third corrugated pipe (7) are fixedly arranged on the measuring cylinder (1) and the pressure sensing plate (501) in a sealing mode respectively, and the inner cavity of the third corrugated pipe (7) is communicated with the outside.

5. A differential pressure gauge with bellows according to claim 4, wherein: the diameters of the second corrugated pipe (6) and the third corrugated pipe (7) are smaller than that of the first corrugated pipe (2).

6. A differential pressure gauge with bellows according to claim 4 or 5, wherein: the pressure sensing plate (501) comprises a cylindrical body and flanges fixedly arranged on the side of the body ring, the body is inserted into the first corrugated pipe (2), the flanges are fixedly arranged on the end face of the first corrugated pipe (2) in a sealing mode, the initial lengths of the second corrugated pipe (6) and the third corrugated pipe (7) are equal, and the opposite ends of the second corrugated pipe and the third corrugated pipe are fixedly arranged on two sides of the body in a sealing mode respectively.

7. A differential pressure gauge with bellows according to claim 6, wherein: the body is attached to the inner wall of the first corrugated pipe (2).

8. A differential pressure gauge with bellows according to claim 7, wherein: the measuring cylinder (1) comprises end covers (103), a cylinder body (105) with two open ends and two pressure sensing seats (104) detachably connected to the two ends of the cylinder body (105), the number of the end covers (103) is two, the end covers are detachably connected to the pressure sensing seats (104) respectively, air passages communicated with the outside are arranged on the end covers (103), the air passages are communicated with inner cavities of the second corrugated pipe (6) and the third corrugated pipe (7) respectively, and the connecting rod (502) is coaxial with one of the air passages.