CN217716511U

CN217716511U - Reducing type wedge-shaped flowmeter

Info

Publication number: CN217716511U
Application number: CN202221422375.3U
Authority: CN
Inventors: 白青松; 陈丽亚; 张占林; 吴美景
Original assignee: CHENGDE FISCHER-PORTER AUTOMATION EQUIPMENT CO LTD
Current assignee: CHENGDE FISCHER-PORTER AUTOMATION EQUIPMENT CO LTD
Priority date: 2022-06-09
Filing date: 2022-06-09
Publication date: 2022-11-01
Anticipated expiration: 2032-06-09

Abstract

The utility model discloses a reducing wedge-shaped flowmeter, which comprises a measuring pipe and a differential pressure signal acquisition and processing unit arranged on the measuring pipe, and is characterized in that the measuring pipe comprises an inlet contraction section, a throat part and an outlet diffusion section which are integrated, the inlet contraction section is a straight line contraction section, and the contraction angle alpha is less than or equal to 30 degrees; the outlet diffusion section and the inlet contraction section are structurally symmetrical; a wedge-shaped throttling piece is arranged in the measuring pipe; and an upstream pressure tapping pipe and a downstream pressure tapping pipe are respectively arranged on two sides of the wedge-shaped throttling element. The device solves the problem of the flow measurement of the fluid with large pipe diameter and small flow rate on site, and is particularly suitable for measuring the flow rate of the dirty, viscous and easily crystallized fluid. The difficult problem of on-site pipeline reconstruction of a user is solved, and the cost and the workload for purchasing instruments and reconstructing the pipeline are reduced. Meanwhile, the application range of the caliber for the flow measurement of the wedge-shaped flowmeter is widened.

Description

Reducing type wedge-shaped flowmeter

Technical Field

The utility model relates to a flowmeter technical field specifically is a undergauge formula wedge flowmeter.

Background

When a plurality of enterprises design and lay process pipelines, based on the consideration of factors such as energy conservation, future energy expansion and the like, the phenomena of large pipe diameter and small flow or large pipe diameter and low flow speed often occur, and great difficulty is brought to the selection of a flowmeter. For the throttling differential pressure type flowmeter, in order to meet the measurement requirement, the throttling opening hole must be very small or even extremely small so as to meet the increase of the differential pressure signal intensity, thereby facilitating the acquisition and processing, but the small opening hole easily causes the increase of vortex, thereby causing the overlarge pressure loss, easy blockage of pipelines, high noise, serious reduction of the measurement accuracy of the flowmeter and other consequences. Especially for dirty, viscous and easily crystallized fluids, the problems of retention, solidification, crystallization and the like are more easily caused by the low flow rate. For such situations, a diameter reduction treatment of the pipeline is usually performed on site to increase the fluid flow rate of the pipeline, and then an appropriate flow meter is selected for flow measurement. However, the diameter reduction also brings trouble to users while solving the problem of 'large pipe diameter and small flow', some users do not have existing pipelines, much effort is needed for reforming a section of proper pipeline, and the installation cost and the workload are increased.

In view of the phenomenon and analysis, the reducing type wedge-shaped flowmeter is designed and developed on the basis of the design of the original standard type wedge-shaped flowmeter, and the stable, reliable and accurate measurement of the flow of the on-site 'large-pipe-diameter small-flow', particularly the flow of dirty, viscous and easily crystallized fluid is met. The problem of the on-site pipeline reconstruction of a user is solved, the cost and the workload of purchasing instruments and pipeline reconstruction are reduced, and the application range of the caliber for flow measurement of the wedge-shaped flowmeter is widened.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a undergauge formula wedge flowmeter has solved the problem that above-mentioned background art provided.

In order to achieve the above purpose, the utility model provides a following technical scheme: a reducing wedge-shaped flowmeter comprises a measuring pipe and a differential pressure signal acquisition processing unit arranged on the measuring pipe, and is characterized in that the measuring pipe comprises an inlet contraction section, a throat part and an outlet diffusion section which are integrated, the inlet contraction section is a linear contraction section, and the contraction angle alpha is less than or equal to 30 degrees; the outlet diffusion section and the inlet contraction section are structurally symmetrical; an instrument flange is arranged on the measuring pipe; a wedge-shaped throttling piece is arranged in the measuring pipe; and an upstream pressure tapping pipe and a downstream pressure tapping pipe are respectively arranged on two sides of the wedge-shaped throttling element.

Preferably, the differential pressure signal acquisition and processing unit is sequentially connected with the differential pressure transmitter, the three valve groups and the adapter from top to bottom; the crossover joint is respectively connected with the upstream pressure tapping pipe and the downstream pressure tapping pipe.

Preferably, the wedge-shaped throttling element is of a V-shaped symmetrical structure, and the lower corner of the wedge-shaped throttling element is in a circular arc shape.

Compared with the prior art, the beneficial effects of the utility model are as follows:

1. the utility model adopts the structure of an inlet contraction section, a throat part and an outlet diffusion section to replace the necking reconstruction of a pipeline on site, thereby improving the fluid flow velocity of the throat part and realizing the accurate measurement of the fluid flow; and the device is suitable for accurately measuring the flow of large-pipe-diameter small-flow liquid, gas, steam and other fluids, particularly dirty, viscous and easily-crystallized fluids.

2. The utility model discloses well survey buret entry contraction section, export diffuser structure are the same, and shrink angle alpha is less than or equal to 30, reduce fluid pressure loss, evenly stabilize the fluid flow field.

3. The length of the throat part of the measuring pipe is not less than d, and the measuring pipe can be properly lengthened, so that the installation of the throttling piece and the pressure tapping pipe on the throat part is ensured.

4. The throttling element is a V-shaped symmetrical wedge-shaped throttling element, has the functions of wear resistance and self cleaning, and is particularly suitable for measuring the flow of dirty, viscous and easily crystallized fluid.

Drawings

FIG. 1 is a schematic view of a cross-sectional structure of a middle measuring tube according to the present invention;

FIG. 2 is a schematic view of the present invention;

fig. 3 is the structure schematic diagram of the differential pressure signal acquisition processing unit of the utility model.

In the figure: 1. the measuring tube, 11 instrument flanges, 12 inlet contraction sections, 13 throats, 14, wedge-shaped throttling pieces, 15 pressure tapping pipes, 16 outlet diffusion sections, 2 differential pressure signal acquisition and processing units, 21 differential pressure transmitters, 22 three valve groups and 23 adapter connectors.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the 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.

Referring to fig. 1-3, the utility model provides a reducing wedge-shaped flowmeter, which comprises a measuring pipe 1 and a differential pressure signal acquisition processing unit 2 installed on the measuring pipe 1, and is characterized in that the measuring pipe 1 comprises an inlet contraction section 12, a throat 13 and an outlet diffusion section 16 which are integrated into a whole, the inlet contraction section 12 is a linear contraction section, and the contraction angle alpha is less than or equal to 30 degrees; the outlet diffusion section 16 is structurally symmetrical with the inlet contraction section 12; an instrument flange 11 is arranged on the measuring pipe 1; a wedge-shaped throttling element 14 is arranged in the measuring pipe 1; an upstream pressure tapping pipe 15 and a downstream pressure tapping pipe 15 are respectively arranged on two sides of the wedge-shaped throttling piece 14.

The utility model provides a undergauge formula wedge flowmeter is applicable to fluid such as big pipe diameter low discharge liquid, gas, steam, especially dirty, thick, the fluidic flow accuracy measurement of easy crystallization. The measuring tube 1 adopts a structure of an inlet contraction section 12, a throat part 13 and an outlet diffusion section 16 to replace on-site pipeline necking reconstruction, so that the fluid flow rate of the throat part 13 is improved, and the accurate measurement of the fluid flow is realized; the inlet contraction section 12 and the outlet diffusion section 16 of the measuring tube 1 have the same structure, the contraction angle alpha is less than or equal to 30 degrees, the fluid pressure loss is reduced, and the fluid flow field is uniformly stabilized; the length of the throat part 13 of the measuring pipe 1 is not less than d, and the measuring pipe can be properly lengthened, so that a throttling piece and a pressure tapping pipe 15 are ensured to be installed on the throat part 13; the throttling element adopts a V-shaped symmetrical structure wedge-shaped throttling element 14, has the functions of wear resistance and self cleaning, and is particularly suitable for measuring the flow of dirty, viscous and easily crystallized fluid.

Preferably, the differential pressure signal acquisition and processing unit 2 is sequentially connected with a differential pressure transmitter 21, a three-valve group 22 and a conversion joint 23 from top to bottom; the adapter 23 is connected to the upstream pressure sampling pipe 15 and the downstream pressure sampling pipe 15 respectively.

Preferably, the wedge-shaped throttling element 14 is a V-shaped symmetrical structure, and the lower corner of the wedge-shaped throttling element is a circular arc.

The utility model provides a undergauge formula wedge flowmeter has solved the difficult problem of on-the-spot "big pipe diameter low discharge" fluid flow measurement, is particularly useful for dirty, thick, the measurement of easy crystallization fluid flow. The problem of the on-site pipeline reconstruction of a user is solved, and the cost and the workload of purchasing instruments and pipeline reconstruction are reduced. Meanwhile, the aperture application range of the wedge-shaped flowmeter is widened. The instrument has high measurement accuracy, stable and reliable work, high integration degree, compact structure, capability of displaying and outputting various data and convenient communication; the method is convenient for users to analyze data and improve the process, improves the production efficiency, reduces the cost and adapts to the social management and control requirements of energy resources.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims

1. A reducing wedge-shaped flowmeter comprises a measuring pipe (1) and a differential pressure signal acquisition processing unit (2) arranged on the measuring pipe (1), and is characterized in that the measuring pipe (1) comprises an inlet contraction section (12), a throat part (13) and an outlet diffusion section (16) which are integrated, the inlet contraction section (12) is a linear contraction section, and the contraction angle alpha is less than or equal to 30 degrees; the outlet diffusion section (16) and the inlet contraction section (12) are symmetrical in structure; an instrument flange (11) is mounted on the measuring pipe (1); a wedge-shaped throttling element (14) is arranged in the measuring pipe (1); and an upstream pressure tapping pipe (15) and a downstream pressure tapping pipe (15) are respectively arranged on two sides of the wedge-shaped throttling piece (14).

2. The reducing wedge flowmeter of claim 1, wherein: the differential pressure transmitter (21), the three-valve group (22) and the adapter (23) are sequentially connected with the differential pressure signal acquisition and processing unit (2) from top to bottom; the conversion joint (23) is respectively connected with the upstream pressure sampling pipe (15) and the downstream pressure sampling pipe (15).

3. The reducing wedge flowmeter of claim 1, wherein: the wedge-shaped throttling element (14) is of a V-shaped symmetrical structure, and the lower corner of the wedge-shaped throttling element is arc-shaped.