CN213902487U

CN213902487U - Venturi flow meter

Info

Publication number: CN213902487U
Application number: CN202022628437.3U
Authority: CN
Inventors: 陈雪中; 孙进; 高春甫; 孙顺远; 陈光远
Original assignee: Jiangsu Huaerwei Science & Technology Group Co ltd
Current assignee: Jiangsu Huaerwei Science & Technology Group Co ltd
Priority date: 2020-11-14
Filing date: 2020-11-14
Publication date: 2021-08-06
Anticipated expiration: 2030-11-14

Abstract

The invention relates to the technical field of flow meters and discloses a venturi flow meter which comprises a contraction section, a pipe exchanger and a diffusion section, wherein the pipe exchanger is arranged behind the contraction section and comprises a front plate, a front throat pipe and a middle plate, the right side of the front surface of the front plate is fixedly connected with the front throat pipe, the left side of the rear surface of the front plate is fixedly connected with the middle plate, the right side of the rear surface of the front plate is fixedly connected with a first rear plate, the left end of the first rear plate is fixedly connected with a second rear plate, the second rear plate is fixedly connected with the middle plate, the right side of the rear surface of the first rear plate is fixedly connected with a rear throat pipe, the rear throat pipe is opposite to the front throat pipe, a pipe exchanging structure is arranged in the pipe exchanger, the venturi flow meter can automatically change the specification of the throat pipe before measuring the fluid flow, the throat pipe can be better ensured to be washed and worn by fluid, the damage is as small as possible, and the service life of the device is greatly prolonged.

Description

Venturi flow meter

Technical Field

The invention relates to the technical field of flowmeters, in particular to a venturi flowmeter.

Background

The venturi flowmeter is a common device for measuring the flow rate of pressure pipelines, belongs to a differential pressure flowmeter, and is commonly used for measuring the flow rate of fluids such as air, natural gas, coal gas, water and the like. It includes "contraction section", "throat" and "diffusion section" 3 portions, and is mounted on the pipeline whose flow quantity is required to be measured. The basic measurement principle of the new generation of differential pressure type flow measuring instrument is a flow measuring method based on the energy conservation law-Bernoulli equation and a flow continuity equation. The inner Venturi tube consists of a circular measuring tube and a special core body which is arranged in the measuring tube and is coaxial with the measuring tube. The radial outer surface of the special core body has a geometric profile similar to the inner surface of a classical Venturi tube, and a reducing annular flow gap is formed between the radial outer surface of the special core body and the inner surface of the measuring tube. The throttling process of the fluid flowing through the inner Venturi tube is basically similar to the throttling process of the fluid flowing through the classical Venturi tube and the annular orifice plate. The structure of the inner Venturi tube makes it have no sharp edge abrasion and dirt accumulation problem similar to orifice plate throttling piece, and can effectively regulate (rectify) the flow of fluid velocity distribution gradient in the throttling front tube and various non-axisymmetric velocity distributions, thereby realizing high-precision and high-stability flow measurement.

Most venturi flowmeter most easily damages is exactly the choke in the present market, the same material of choke and import/export, and the choke is in the inside of flowmeter, hardly regular maintenance or change operation, make the choke in the venturi flowmeter of same specification can't be changed, the choke diameter is one of the factor that influences the venturi resistance, increase choke diameter can reduce the resistance by a wide margin, especially the great operating mode condition of flow, the fluid can be more serious to the washing away and the wearing and tearing of small dimension choke, can't guarantee its measurement accuracy in the past for a long time, consequently need a neotype venturi flowmeter urgently.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides the Venturi flowmeter which has the advantages of prolonging the service life of the device and the like, and solves the problems that the scouring and the abrasion of fluid to a small-size throat pipe are more serious under the working condition of larger flow.

(II) technical scheme

In order to achieve the purpose, the invention provides the following technical scheme: a venturi flowmeter comprises a contraction section, a tube exchanger and a diffusion section, wherein the tube exchanger is arranged behind the contraction section and comprises a front plate, a front throat tube and a middle plate, the right side of the front surface of the front plate is fixedly connected with the front throat tube, the left side of the rear surface of the front plate is fixedly connected with the middle plate, the right side of the rear surface of the front plate is fixedly connected with a first rear plate, the left end of the first rear plate is fixedly connected with a second rear plate, the second rear plate is fixedly connected with the middle plate, the right side of the rear surface of the first rear plate is fixedly connected with a rear throat tube, and the rear throat tube is opposite to the front throat tube;

the inside of the tube replacing device is provided with a tube replacing structure.

The telescopic section comprises a telescopic pipe and a first connecting flange, the outer side of the front end of the telescopic pipe is fixedly connected with the first connecting flange, the rear end of the telescopic pipe is fixedly connected to the front surface of the front plate, and the front pipe of the throat pipe extends into the telescopic pipe.

The diffusion section comprises a diffusion pipe and a second connecting flange, the second connecting flange is fixedly connected to the outer side of the rear end of the diffusion pipe, the front end of the diffusion pipe is fixedly connected to the rear surface of the first rear plate, and the rear pipe of the throat pipe extends into the diffusion pipe.

The front surface of the second rear plate is provided with a rotating hole, a handle is arranged inside the rotating hole, and the front end of the handle is movably connected inside the rotating hole through a bearing.

The front surface of the first rear plate is provided with a placing groove, the placing groove is communicated with the rear pipe of the throat pipe, and the left inner wall of the placing groove is provided with a side groove.

Preferably, the tube replacing structure comprises a tube replacing disc, a throat and an anti-seepage pad, the tube replacing disc is embedded into the placing groove, the tube replacing disc is matched with the placing groove, the outer ring of the front surface of the tube replacing disc is inserted with the throat, the throat penetrates through the tube replacing disc, the number of the throats is ten, the anti-seepage pads are fixedly connected to the outer sides of the front end and the rear end of each throat, the right-most throat is opposite to the front throat and the rear throat, the front end of the right-most throat is in contact with the rear end of the front throat, and the rear end of the right-most throat is in contact with the front end of the rear throat.

Preferably, the bearing is embedded in the middle of the front surface of the tube changing disc, the inner ring of the bearing is fixedly connected with a connecting column, and the front end of the connecting column is fixedly connected to the front plate.

Preferably, the left side of trading the pipe dish is provided with the rectangular block, the rear surface laminating back plate two of rectangular block, the rear surface fixed connection handle of rectangular block, the front end fixed connection circle piece of rectangular block, the right side fixed connection of circle piece trades the tubular column, trade the tubular column and insert the side inslot portion at the one end of keeping away from the circle piece, trade tubular column and side slot adaptation, trade that the one end that the tubular column kept away from the circle piece is in the leftmost end the upside of choke.

(III) advantageous effects

Compared with the prior art, the invention provides a venturi flowmeter, which has the following beneficial effects:

1. this venturi flowmeter, design through the structure of trading the pipe, in the outside of venturi flowmeter, be exactly the rear side of back plate two, the handle rotates, can drive the inside rectangular block of the ware of trading and circle piece rotate, thereby make and trade the tubular column and rotate downwards, when the handle rotates the round, the choke of switch-on venturi flowmeter will change into next specification, in the measuring fluid that faces different flow cardinalities like this, can be before measuring fluid flow, change the specification of choke by oneself, guarantee the size adaptation of choke and the cardinality of measuring fluid, so can make the resistance size of venturi all the time, assurance choke that can be better is under fluidic washing away and wearing and tearing, receive the injury as little as possible, great improvement the life of device.

2. This venturi flowmeter, through the design of trading the pipe structure for operating personnel can carry out the regulation of choke size according to the idea of self, can make things convenient for the venturi flowmeter like this when experimenting, the data of regulation choke that can be quick and accurate, like this in the test to venturi flowmeter or to the measurement of same fluid, the accuracy all can be higher, consequently trade the design of pipe structure also on some angles, has increased the accurate degree of measurement of venturi flowmeter.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the tube exchanger according to the present invention;

FIG. 3 is a schematic diagram of an exploded structure of the tube changer of the present invention;

FIG. 4 is a schematic view of a tube replacement structure according to the present invention.

In the figure: 1, 101, 102, a first connecting flange, 2 tube changing devices, 201 front plates, 202, middle plates, 204, 205, 206, 207, turning holes, 208 handles, 209 placement grooves, 210 side grooves, 3 diffusion sections, 301, 302, a second connecting flange, 4 tube changing structures, 401 tube changing discs, 402, throats, 403 anti-seepage pads, 404 bearings, 405 connecting columns, 406 rectangular blocks, 407 round blocks and 408 tube changing columns.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 4, a venturi flowmeter includes a contraction section 1, a tube exchanger 2 and a diffusion section 3, the tube exchanger 2 is disposed behind the contraction section 1, the tube exchanger 2 includes a front plate 201, a throat front tube 202 and a middle plate 203, the front surface right side of the front plate 201 is fixedly connected with the throat front tube 202, the rear surface left side of the front plate 201 is fixedly connected with the middle plate 203, the rear surface right side of the front plate 201 is fixedly connected with a rear plate one 204, the left end of the rear plate one 204 is fixedly connected with a rear plate two 205, the rear plate two 205 is fixedly connected with the middle plate 203, the rear surface right side of the rear plate one 204 is fixedly connected with a throat rear tube 206, and the throat rear tube 206 is opposite to the throat front tube 202;

the pipe changing structure 4 is arranged in the pipe changing device 2, through the design of the pipe changing structure 4, the handle 208 is rotated outside the venturi flow meter, namely the rear side of the second back plate 205, the rectangular block 406 and the round block 407 in the pipe changing device 2 can be driven to rotate, so that the pipe changing column 408 rotates downwards, when the handle 208 rotates for a circle, the throat 402 connected with the venturi flow meter can be changed into the next specification, so that for measuring fluids with different flow base numbers, the specification of the throat 402 can be changed automatically before the flow of the fluid is measured, the size of the throat 402 is ensured to be matched with the base number of the measuring fluid, the resistance of the venturi tube can be ensured to be small in damage under the scouring and abrasion of the fluid all the time, and the service life of the device is greatly prolonged; through the design of tube changing structure 4 for operating personnel can carry out the regulation of choke 402 size according to the idea of self, can make things convenient for the venturi flowmeter to carry out the experiment like this, the data of regulation choke 402 that can be quick and accurate, test to the venturi flowmeter or to the measurement of same fluid like this, the accuracy all can be higher, consequently tube changing structure 4's design also has increased the accurate degree of measurement of venturi flowmeter on some angles.

The contraction section 1 comprises a contraction pipe 101 and a first connecting flange 102, the first connecting flange 102 is fixedly connected to the outer side of the front end of the contraction pipe 101, the rear end of the contraction pipe 101 is fixedly connected to the front surface of the front plate 201, and the throat pipe front pipe 202 extends into the contraction pipe 101.

The diffuser section 3 comprises a diffuser pipe 301 and a second connecting flange 302, the second connecting flange 302 is fixedly connected to the outer side of the rear end of the diffuser pipe 301, the front end of the diffuser pipe 301 is fixedly connected to the rear surface of the first back plate 204, and the throat pipe rear pipe 206 extends into the diffuser pipe 301.

The front surface of the second rear plate 205 is provided with a rotating hole 207, a handle 208 is arranged inside the rotating hole 207, and the front end of the handle 208 is movably connected inside the rotating hole 207 through a bearing.

The front surface of the first back plate 204 is provided with a placing groove 209, the placing groove 209 is communicated with the throat back pipe 206, and the left inner wall of the placing groove 209 is provided with a side groove 210.

The tube replacing structure 4 comprises a tube replacing disc 401, a throat 402 and an anti-seepage pad 403, the tube replacing disc 401 is embedded into a placing groove 209, the tube replacing disc 401 is matched with the placing groove 209, the outer ring of the front surface of the tube replacing disc 401 is inserted with the throat 402, the throat 402 penetrates through the tube replacing disc 401, the number of the throats 402 is ten, the specifications of the ten throats 402 are different, the anti-seepage pads 403 are fixedly connected to the outer sides of the front end and the rear end of each throat 402, the right throat 402 is opposite to the front throat 202 and the rear throat 206, the front end of the right throat 402 is in contact with the rear end of the front throat 202, and the rear end of the right throat 402 is in contact with the front end of the rear throat 206.

A bearing 404 is embedded in the middle of the front surface of the tube changing disc 401, an inner ring of the bearing 404 is fixedly connected with a connecting column 405, and the front end of the connecting column 405 is fixedly connected to the front plate 201.

A rectangular block 406 is arranged on the left side of the tube changing disc 401, the rear surface of the rectangular block 406 is attached to the second rear plate 205, the rear surface of the rectangular block 406 is fixedly connected with the handle 208, the front end of the rectangular block 406 is fixedly connected with a round block 407, the right side of the round block 407 is fixedly connected with a tube changing column 408, the end, far away from the round block 407, of the tube changing column 408 is inserted into the side groove 210, the tube changing column 408 is matched with the side groove 210, and the end, far away from the round block 407, of the tube changing column 408 is located on the upper side of the leftmost end throat pipe 402.

When in use, the utility model is used,

the first step is as follows: through the design of the tube changing structure 4, outside the venturi flow meter, namely the rear side of the second back plate 205, the handle 208 is rotated, the rectangular block 406 and the circular block 407 inside the tube changing device 2 can be driven to rotate, so that the tube changing column 408 rotates downwards, when the handle 208 rotates for one circle, the throat 402 connected with the venturi flow meter can be changed into the next specification, so that the specification of the throat 402 can be changed by itself before measuring the flow of fluid in the face of measuring fluid with different flow base numbers, the size of the throat 402 is ensured to be matched with the base number of the measuring fluid, the resistance of the venturi 402 can be ensured to be always, the venturi 402 can be better ensured to be damaged as little as possible under the scouring and abrasion of the fluid, and the service life of the device is greatly prolonged.

The second step is that: through the design of tube changing structure 4 for operating personnel can carry out the regulation of choke 402 size according to the idea of self, can make things convenient for the venturi flowmeter to carry out the experiment like this, the data of regulation choke 402 that can be quick and accurate, test to the venturi flowmeter or to the measurement of same fluid like this, the accuracy all can be higher, consequently tube changing structure 4's design also has increased the accurate degree of measurement of venturi flowmeter on some angles.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that 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. The utility model provides a venturi flowmeter, includes shrink section (1), trades tub ware (2) and diffuser section (3), the rear of shrink section (1) is provided with trades tub ware (2), its characterized in that: the tube changer (2) comprises a front plate (201), a throat front tube (202) and a middle plate (203), the throat front tube (202) is fixedly connected to the right side of the front surface of the front plate (201), the middle plate (203) is fixedly connected to the left side of the rear surface of the front plate (201), a rear plate I (204) is fixedly connected to the right side of the rear surface of the front plate (201), a rear plate II (205) is fixedly connected to the left end of the rear plate I (204), the rear plate II (205) is fixedly connected with the middle plate (203), a throat rear tube (206) is fixedly connected to the right side of the rear surface of the rear plate I (204), and the throat rear tube (206) is opposite to the throat front tube (202);

and a pipe replacing structure (4) is arranged in the pipe replacing device (2).

2. The venturi flow meter of claim 1, wherein: the contraction section (1) comprises a contraction pipe (101) and a first connecting flange (102), the first connecting flange (102) is fixedly connected to the outer side of the front end of the contraction pipe (101), the rear end of the contraction pipe (101) is fixedly connected to the front surface of the front plate (201), and the throat pipe front pipe (202) extends into the contraction pipe (101).

3. The venturi flow meter of claim 1, wherein: the diffusion section (3) comprises a diffusion pipe (301) and a second connecting flange (302), the second connecting flange (302) is fixedly connected to the outer side of the rear end of the diffusion pipe (301), the front end of the diffusion pipe (301) is fixedly connected to the rear surface of the first back plate (204), and the rear throat pipe (206) extends into the diffusion pipe (301).

4. The venturi flow meter of claim 1, wherein: a rotating hole (207) is formed in the front surface of the second rear plate (205), a handle (208) is arranged inside the rotating hole (207), and the front end of the handle (208) is movably connected inside the rotating hole (207) through a bearing.

5. The venturi flow meter of claim 1, wherein: the front surface of the first rear plate (204) is provided with a placing groove (209), the placing groove (209) is communicated with the rear throat pipe (206), and the left inner wall of the placing groove (209) is provided with a side groove (210).

6. The venturi flow meter of claim 1, wherein: the pipe replacing structure (4) comprises a pipe replacing disc (401), a throat pipe (402) and an anti-seepage pad (403), the pipe replacing disc (401) is embedded into a placing groove (209), the pipe replacing disc (401) is matched with the placing groove (209), the throat pipe (402) is inserted into the outer ring of the front surface of the pipe replacing disc (401), the throat pipe (402) penetrates through the pipe replacing disc (401), the number of the throat pipes (402) is ten, the outer sides of the front end and the rear end of each throat pipe (402) are fixedly connected with the anti-seepage pad (403), the rightmost throat pipe (402) is opposite to the throat pipe front pipe (202) and the throat pipe rear pipe (206), the front end of the rightmost throat pipe (402) is in contact with the rear end of the throat pipe front pipe (202), and the rear end of the rightmost throat pipe (402) is in contact with the front end of the throat pipe rear pipe (206).

7. The venturi flow meter of claim 6, wherein: the pipe changing plate is characterized in that a bearing (404) is embedded in the middle of the front surface of the pipe changing plate (401), a connecting column (405) is fixedly connected to the inner ring of the bearing (404), and the front end of the connecting column (405) is fixedly connected to the front plate (201).

8. The venturi flow meter of claim 6, wherein: a rectangular block (406) is arranged on the left side of the pipe changing disc (401), the rear surface of the rectangular block (406) is attached to the second rear plate (205), the rear surface of the rectangular block (406) is fixedly connected with a handle (208), the front end of the rectangular block (406) is fixedly connected with a round block (407), the right side of the round block (407) is fixedly connected with a pipe changing column (408), the end, far away from the round block (407), of the pipe changing column (408) is inserted into the side groove (210), the pipe changing column (408) is matched with the side groove (210), and the end, far away from the round block (407), of the pipe changing column (408) is located on the upper side of the leftmost end of the throat pipe (402).