CN220304597U - Annular cavity pressure-taking differential pressure flowmeter - Google Patents

Abstract

The utility model relates to the technical field of differential pressure flow meters, in particular to an annular cavity pressure-taking type differential pressure flow meter which comprises a pressure-bearing pipe body, a throttling element and two inner sleeves sleeved in the pressure-bearing pipe body, wherein a first annular groove, a positioning structure and a second annular groove are sequentially formed on an inner hole of the pressure-bearing pipe body along the conveying direction of a fluid medium; the diameter of the inner hole of the positioning structure is not larger than that of the inner hole of the pressure-bearing pipe body; the two inner sleeves are fixedly connected with the pressure-bearing pipe body, the outer peripheral surfaces of the inner sleeves are matched with the inner holes of the pressure-bearing pipe body, and the two inner sleeves are respectively arranged at two sides of the positioning structure and used for respectively shielding the notch of the first annular groove and the notch of the second annular groove; forming a first annular cavity and a second annular cavity; the first annular cavity is communicated with the inner cavity of the inner sleeve at the same side, and the second annular cavity is communicated with the inner cavity of the inner sleeve at the same side; the upstream pressure measuring device is communicated with the first annular cavity, and the downstream pressure measuring device is communicated with the second annular cavity.

Description

Annular cavity pressure-taking differential pressure flowmeter

Technical Field

The utility model relates to the technical field of differential pressure flowmeters, in particular to an annular cavity pressure taking type differential pressure flowmeter.

Background

A differential pressure flow meter is an instrument that measures flow. The flow measurement is realized by measuring the pressure difference by utilizing the principle that a certain relationship exists between the pressure difference and the flow rate generated when the fluid flows through the throttling element; the throttling element is a local contraction element arranged in the pipeline, and the differential pressure flowmeter is generally divided into an orifice flowmeter, a nozzle flowmeter, a venturi flowmeter and the like according to the difference of the throttling element; according to the pressure measurement modes of the differential pressure flowmeter, the differential pressure flowmeter can be divided into a drilling pressure measurement differential pressure flowmeter, an annular cavity pressure measurement differential pressure flowmeter (also called annular chamber pressure measurement differential pressure flowmeter), a flange pressure measurement differential pressure flowmeter, a D-D/2 pressure measurement differential pressure flowmeter and the like;

the annular cavity pressure-taking type differential pressure flowmeter is not easy to block a pressure-taking hole, has simple geometric shape, can be precisely machined and assembled, is easy to improve measurement accuracy, does not need long straight pipelines to be matched and installed, and is widely applied to various pipeline fields (particularly to the pipeline fields for conveying dirty mediums such as steam, coal gas, cooling water and the like).

However, the existing annular cavity pressure-taking type differential pressure flowmeter generally divides a pressure-bearing pipe body into a front section pipe body and a rear section pipe body, and a throttling element is clamped through the front section pipe body and the rear section pipe body; the connection of the front section of pipe body and the rear section of pipe body is generally realized by the following two modes: (1) The front section and the rear section are connected in a welding mode to form a circumferential butt weld; (2) Flanges are respectively arranged on the front section of pipe body and the rear section of pipe body, and the two flanges clamp the throttling element (sealing elements are additionally arranged on the two sides of the throttling element) and are connected through bolts so as to achieve the purposes of fixing the throttling element and sealing; the circumferential butt welding seam in the mode (1) cannot realize full-penetration welding of the pressure-bearing pipe body, severe stress concentration exists in a welding joint, and volume nondestructive detection (radial detection or ultrasonic detection) of the welding seam cannot be realized, so that the circumferential butt welding seam is difficult to meet the safety technical specification requirement of a pressure pipeline, and has great potential safety hazard; the mode (2) has the risk that the flange and the throttling element leak due to unreliable sealing, the flange connecting structure can increase the radial and axial dimensions of the annular cavity pressure-taking differential pressure flowmeter, the installation space is occupied, and the manufacturing cost is also greatly increased; the existing annular cavity pressure-taking type differential pressure flowmeter generally has the problems of complex processing technology and assembly procedures, large occupied space, long production period, high production cost and high safety risk.

Disclosure of Invention

In order to solve the defects in the prior art, the utility model provides the annular cavity pressure-taking type differential pressure flowmeter to solve the problems that the existing annular cavity pressure-taking type differential pressure flowmeter is complex in processing technology and assembly process, large in occupied space, long in production period, high in production cost and high in safety risk.

In order to achieve the above purpose, the technical scheme of the utility model is as follows:

the annular cavity pressure-taking type differential pressure flowmeter comprises a pressure-bearing pipe body, a throttling element and two inner sleeves sleeved in the pressure-bearing pipe body, wherein the pressure-bearing pipe body is used for conveying fluid media, the pressure-bearing pipe body is integrally formed, and a first annular groove, a positioning structure and a second annular groove are sequentially formed in the inner hole of the pressure-bearing pipe body along the conveying direction of the fluid media;

the first annular groove and the second annular groove are formed along the circumferential direction of the pressure-bearing pipe body, the positioning structure is in a circular ring shape, the positioning structure is coaxial with the pressure-bearing pipe body, and the diameter of an inner hole of the positioning structure is not larger than that of an inner hole of the pressure-bearing pipe body; the throttling piece is assembled in the positioning structure and fixedly connected with the positioning structure, and the outer peripheral surface of the throttling piece is matched with the inner peripheral surface of the positioning structure;

the two inner sleeves are fixedly connected with the pressure-bearing pipe body, the outer peripheral surfaces of the inner sleeves are matched with the inner holes of the pressure-bearing pipe body, and the two inner sleeves are respectively arranged on two sides of the positioning structure and used for respectively shielding the notch of the first annular groove and the notch of the second annular groove; forming a first annular cavity between the first annular groove and the inner sleeve on the same side, and forming a second annular cavity between the second annular groove and the inner sleeve on the same side; the inner sleeves are provided with a through-flow channel; the two through-flow channels are respectively used for communicating the first annular cavity with the inner cavity of the inner sleeve at the same side and communicating the second annular cavity with the inner cavity of the inner sleeve at the same side;

two through holes are formed in the pressure-bearing pipe body, one through hole is used for being communicated with the first annular cavity and the upstream pressure measuring device, and the other through hole is used for being communicated with the second annular cavity and the downstream pressure measuring device.

The throttling piece is used for communicating the inner cavities of the two inner sleeves, and pressure difference is formed between the inner cavities of the two inner sleeves.

In the technical scheme, the pressure-bearing pipe body is integrally formed, so that the technical problems that the pressure-bearing pipe body is divided into a front section pipe body and a rear section pipe body in the traditional annular cavity pressure-taking type differential pressure flowmeter are structurally avoided, the technical problems that the pressure-bearing pipe body is connected with the front section pipe body and the rear section pipe body by bolts are avoided (such as that the front section pipe body and the rear section pipe body are welded to form an annular butt welding seam, the annular butt welding seam cannot realize full-welding penetration welding of the pressure-bearing pipe body, serious stress concentration exists in a welding joint, and volume nondestructive detection of the welding seam cannot be realized, the annular butt welding seam is difficult to meet the safety technical specification requirement of a pressure pipeline and has larger potential safety hazard are solved, or the flanges are respectively arranged on the front section pipe body and the rear section pipe body, the flanges are clamped with the throttling piece, the sealing piece is additionally arranged at two sides of the throttling piece by bolts, the flange and the throttling piece leak due to unreliable sealing, the radial and axial dimension of the annular cavity pressure-taking type differential pressure flowmeter are increased due to the flange connecting structure, the technical problems that the radial and axial dimension of the annular pressure-taking type differential pressure flowmeter are occupied, the large installation space and the manufacturing cost are greatly improved,

in the technical scheme, the pressure-bearing pipe body is integrally formed without a circumferential butt weld, so that the problems that the bearing capacity of the incomplete welded joint is insufficient, stress concentration is caused, and the volume nondestructive detection cannot be realized are avoided; compared with a flange connection structure, the sealing surface leakage is avoided, the geometric dimension is compact, the processing technology is simple, and the manufacturing cost and the installation cost are low; the technical problems of complex processing technology and assembly procedures, large occupied space, long production period, high production cost and high safety risk of the existing annular cavity pressure-taking type differential pressure flowmeter are solved.

Furthermore, one end of the inner sleeve, which is far away from the positioning structure, is welded and connected to the inner hole of the pressure-bearing pipe body.

The welding seam between the inner sleeve and the inner hole of the pressure-bearing pipe body is a non-pressure-bearing welding seam, so that potential safety hazards are avoided.

Further, the positioning structure is an annular protruding part integrally formed on the inner hole of the pressure-bearing pipe body.

The positioning structure is arranged to be the annular protruding part integrally formed on the inner hole of the pressure-bearing pipe body, so that the positioning structure can be machined in the inner hole machining process of the pressure-bearing pipe body, the positioning structure is not required to be arranged to be an additional assembly part, the machining process of fixedly connecting the positioning structure in the pressure-bearing pipe body is reduced, and the assembly time is saved.

In another technical scheme, an annular groove is formed in an inner hole of the pressure-bearing pipe body along the circumferential direction, the positioning structure is an annular member fixedly connected in the annular groove, the outer circumferential surface of the annular member is matched with the groove bottom of the annular groove, and the annular member is used for separating the annular groove into the first annular groove and the second annular groove.

The above technical solution is based on the consideration of making the thickness of the seamless steel pipe as thick as possible for pressure bearing when the pressure bearing pipe body is manufactured using the finished seamless steel pipe. The scheme is that the positioning structure and the pressure-bearing pipe body are manufactured separately, the first annular groove and the second annular groove machined on the inner surface of the pressure-bearing pipe body are combined into an annular groove, and the positioning structure is arranged in the middle of the annular groove of the pressure-bearing pipe body and is in clearance fit with the annular groove.

Based on the assembly accessibility requirement of the positioning structure, the positioning structure cannot be integrated and at least needs to be divided into three arc-shaped pieces, and the maximum value of the distance between any two points on the radial section of each arc-shaped piece is smaller than the inner diameter of the pressure-bearing pipe body.

Further, at least one protruding portion is arranged on the groove bottom of the annular groove and used for abutting against one side, facing the output side of the fluid medium, of the annular component.

By arranging the protruding part, the protruding part is abutted to one side of the annular member, which faces the output side of the fluid medium, so that when the annular member (namely the positioning structure) and the throttling piece bear the impact of the fluid medium in the flow direction, the protruding part can support the annular member, so that the stress of the fixed connection part between the annular member and the pressure-bearing pipe body is reduced, and the fixed connection part between the annular member and the pressure-bearing pipe body is protected.

Further, the number of the protruding parts is one, and the protruding parts are annular and extend along the circumferential direction of the annular groove.

In another aspect, the number of the protruding portions is plural, and the plural protruding portions are arranged at intervals along the circumferential direction of the annular groove.

Further, the annular cavity pressure-taking differential pressure flowmeter further comprises a plurality of clamping strips, each clamping strip is arranged at the bottom of the first annular groove, each clamping strip is uniformly distributed along the circumferential direction of the first annular groove, the uniform end of each clamping strip abuts against the side surface, far away from the positioning structure, of the first annular groove, and the other end of each clamping strip abuts against the positioning structure.

Further, the annular member comprises at least three identical arc-shaped pieces, and the arc-shaped pieces are sequentially connected end to end along the circumferential direction of the pressure-bearing pipe body to form a circular ring.

Further, a male spigot is arranged on one side of the inner hole of the positioning structure, which is close to the output side of the fluid medium of the pressure-bearing pipe body, and a female spigot matched with the male spigot is arranged on one side of the outer peripheral surface of the throttling piece, which is close to the output side of the fluid medium of the pressure-bearing pipe body.

Through setting up public tang with female tang when the throttling element bears the upward impact of the flow of fluid medium, location structure can pass through public tang with the cooperation of female tang is spacing, to the throttling element forms the support, in order to reduce throttling element with the atress of the fixed connection department between the location structure, to throttling element with the fixed connection department between the location structure forms the protection.

Further, the inner diameter of the positioning structure is larger than the inner diameter of the inner sleeve; one end of the inner sleeve, which is used for shielding the first annular groove, towards the positioning structure is propped against the throttling piece, so that the female spigot is tightly matched with the male spigot.

The inner sleeve used for shielding the first annular groove is propped against the throttling element towards one end of the positioning structure, so that the female spigot is tightly matched with the male spigot, the fixation between the throttling element and the positioning structure can be completed, and other fixed connection (such as welding connection, bolt connection and the like) positions between the throttling element and the positioning structure are not needed.

Drawings

In order to more clearly illustrate the technical solutions of the present utility model, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a sectional view showing the structure of a pressure differential flowmeter of the middle ring cavity in embodiment 1;

FIG. 2 is an enlarged partial view of area A of FIG. 1;

FIG. 3 is a front view of the structure of the inner sleeve in example 1;

FIG. 4 is a left side view of the structure of the inner sleeve in example 1;

FIG. 5 is a schematic structural view of the positioning structure in embodiment 1;

FIG. 6 is a schematic diagram of the structure corresponding to the area A in embodiment 2;

FIG. 7 is a schematic diagram of the structure corresponding to the area A in embodiment 3;

FIG. 8 is a schematic diagram of the structure corresponding to the area A in embodiment 4;

FIG. 9 is a schematic diagram of the structure corresponding to the A region in embodiment 5;

FIG. 10 is a sectional view showing the structure of a pressure differential flowmeter of the middle ring cavity in example 6;

FIG. 11 is a sectional view showing the structure of a pressure differential flowmeter of the middle ring cavity in example 7;

FIG. 12 is a sectional view showing the structure of a pressure differential flowmeter of the middle ring cavity in example 8;

FIG. 13 is an enlarged partial view of region B of FIG. 12;

FIG. 14 is a front view of the structure of an inner sleeve for shielding a first annular groove in embodiment 8;

FIG. 15 is a right side view of the structure of the inner sleeve for shielding the first annular groove in embodiment 8;

FIG. 16 is a front view of the structure of an inner sleeve for shielding a first annular groove in embodiment 9;

FIG. 17 is a right side view of the structure of the inner sleeve for shielding the first annular groove in embodiment 9;

wherein, 1-pressure-bearing pipe body, 2-throttling element, 3-inner sleeve, 4-first annular cavity, 5-second annular cavity, 6-upstream pressure measuring device, 7-downstream pressure measuring device, 8-pin shaft and 9-positioning structure

11-a first annular groove, 12-a second annular groove and 13-a through hole;

91-arc piece;

31-overflow groove, 32-overflow hole.

Detailed Description

The following description of the embodiments of the present utility model will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the examples described are only some, but not all, examples of the present utility model.

Example 1:

as shown in fig. 1 and 2, this embodiment 1 provides a pressure-taking differential pressure flowmeter with an annular cavity, which includes a pressure-bearing pipe body 1, a throttling element 2, and two inner sleeves 3 sleeved in the pressure-bearing pipe body 1, wherein the pressure-bearing pipe body 1 is used for conveying fluid medium, the pressure-bearing pipe body 1 is integrally formed integrally, and a first annular groove 11, a positioning structure 9 and a second annular groove 12 are sequentially formed on an inner hole of the pressure-bearing pipe body 1 along the conveying direction of the fluid medium;

the first annular groove 11 and the second annular groove 12 are formed along the circumferential direction of the pressure-bearing pipe body 1, the positioning structure 9 is in a circular ring shape, the positioning structure 9 is coaxial with the pressure-bearing pipe body 1, and the inner diameter of the positioning structure 9 is not larger than the diameter of an inner hole of the pressure-bearing pipe body 1; the throttling element 2 is assembled in the positioning structure 9 and fixedly connected with the positioning structure 9, and the outer peripheral surface of the throttling element 2 is matched with the inner peripheral surface of the positioning structure 9;

the two inner sleeves 3 are fixedly connected with the pressure-bearing pipe body 1, the outer peripheral surfaces of the inner sleeves 3 are matched with the inner holes of the pressure-bearing pipe body 1, and the two inner sleeves 3 are respectively arranged at two sides of the positioning structure 9 and used for respectively shielding the notch of the first annular groove 11 and the notch of the second annular groove 12; so as to form a first annular cavity 4 between the first annular groove 11 and the inner sleeve 3 on the same side, and a second annular cavity 5 between the second annular groove 12 and the inner sleeve 3 on the same side; the inner sleeve 3 is provided with a flow passage; the two through-flow channels are respectively used for communicating the first annular cavity 4 with the inner cavity of the inner sleeve 3 on the same side and communicating the second annular cavity 5 with the inner cavity of the inner sleeve 3 on the same side;

the throttling element 2 is provided with a second flow passage for communicating the inner cavities of the two inner sleeves 3;

two through holes 13 are formed in the pressure-bearing pipe body 1, one through hole 13 is used for communicating the first annular cavity 4 with the upstream pressure measuring device 6, and the other through hole 13 is used for communicating the second annular cavity 5 with the downstream pressure measuring device 7.

In the technical scheme, the pressure-bearing pipe body 1 is integrally formed, so that the technical problems that the pressure-bearing pipe body 1 is divided into a front section pipe body and a rear section pipe body in the traditional annular cavity pressure-taking type differential pressure flowmeter are structurally avoided, and the technical problems that the flange and the throttling piece 2 leak due to unreliable sealing are solved (for example, the front section pipe body and the rear section pipe body are welded to form an annular butt welding seam, the annular butt welding seam cannot realize full-welding penetration welding of the pressure-bearing pipe body 1, serious stress concentration exists in a welding joint, and volume nondestructive detection of the welding seam cannot be realized, so that the annular butt welding seam is difficult to meet the technical specification requirement of pressure pipeline safety, and has large potential safety hazards are solved, or the flange is respectively arranged on the front section pipe body and the rear section pipe body, the throttling piece 2 is clamped by the two flanges, the sealing piece is arranged on two sides of the throttling piece, the flange is connected by bolts, the radial and axial dimensions of the annular cavity pressure-taking type differential pressure flowmeter are increased, the large installation space is occupied, and the manufacturing cost is also greatly improved.

In the technical scheme, the pressure-bearing pipe body 1 is integrally formed without a circumferential butt weld, so that the problems that the bearing capacity of the incomplete weld is insufficient, stress concentration is caused, and the volume nondestructive detection cannot be realized are avoided; compared with a flange connection structure, the sealing surface leakage is avoided, the geometric dimension is compact, the processing technology is simple, and the manufacturing cost and the installation cost are low; the technical problems of complex processing technology and assembly procedures, large occupied space, long production period, high production cost and high safety risk of the existing annular cavity pressure-taking type differential pressure flowmeter are solved.

Wherein the orifice 2 may be provided as various types of orifices including, but not limited to: orifice, nozzle, venturi, cone, etc.

In this embodiment 1, the throttle 2 is a nozzle throttle.

In this embodiment 1, as shown in fig. 1, the end of the inner sleeve 3, which is far away from the positioning structure 9, is welded to the inner hole of the pressure-bearing pipe body 1.

The technical solution of sequentially forming the first annular groove 11, the positioning structure 9 and the second annular groove 12 on the inner hole of the pressure-bearing pipe body 1 along the conveying direction of the fluid medium includes various implementation manners, including but not limited to the following schemes:

scheme one:

a first annular groove 11 and a second annular groove 12 are sequentially formed on an inner hole of the pressure-bearing pipe body 1 at intervals along the conveying direction of the fluid medium, and a positioning structure 9 is formed between the first annular groove 11 and the second annular groove 12; in the first scheme, the positioning mechanism 9 and the inner hole of the pressure-bearing pipe body 1 are integrally formed.

Scheme II:

an annular groove is formed in the inner hole of the pressure-bearing pipe body 1 along the circumferential direction, the positioning structure 9 is an annular member fixedly connected in the annular groove, the outer circumferential surface of the positioning structure 9 is matched with the groove bottom of the annular groove, and the positioning structure 9 is used for separating the annular groove into a first annular groove 11 and a second annular groove 12.

In the present embodiment 1, the arrangement scheme of the first annular groove 11, the positioning structure 9, and the second annular groove 12 adopts the scheme two described above;

as shown in fig. 1, an annular groove is formed in an inner hole of the pressure-bearing pipe body 1 along the circumferential direction, the positioning structure 9 is an annular member fixedly connected in the annular groove, the outer circumferential surface of the positioning structure 9 is matched with the groove bottom of the annular groove, and the positioning structure 9 is used for separating the annular groove into a first annular groove 11 and a second annular groove 12.

If the positioning structure 9 is a single piece, the positioning structure 9 cannot be installed in the annular groove due to the limitation of the structural size (because the outer diameter of the positioning structure 9 is larger than the diameter of the inner hole of the pressure-bearing pipe body 1).

Thus in this embodiment 1, the method of installing the locating structure 9 into the annular groove includes, but is not limited to: the annular member is divided into at least three arc-shaped pieces, and the distance between any two points of the radial section of each arc-shaped piece is smaller than the inner diameter of the pressure-bearing pipe body 1. The radian of each arc-shaped piece can be the same or different.

In this embodiment 1, as shown in fig. 5, the ring-shaped member includes four identical arc-shaped pieces 91 (if each arc-shaped piece 91 is identical, it is only necessary to provide at least three arc-shaped pieces), and each arc-shaped piece 91 is connected in turn end to end along the circumferential direction of the pressure-bearing pipe body 1 to form a ring.

Wherein, the fixed connection between the positioning structure 9 and the pressure-bearing pipe body 1, and the fixed connection between the positioning structure 9 and the throttling element 2 have various implementation methods, such as but not limited to: in embodiment 1, as shown in fig. 2, each arc-shaped member 91 is sequentially installed in an annular groove to form a circular ring, and then the arc-shaped member 91 is welded to the annular groove, and the inner peripheral surface of the inner hole of the positioning structure 9 is welded to the outer peripheral surface of the throttling member 2.

Because the first annular cavity 4, the second annular cavity 5 and the inner cavity of the corresponding inner sleeve 3 are required to be communicated, the fluid on the upper and the lower stream of the throttling element 2 is ensured to flow into the first annular cavity and the second annular cavity respectively. This embodiment 1 is realized in the following manner:

mode one:

when the inner sleeve 3 is installed, a certain gap between the inner sleeve 3 and the throttling element 2 is ensured, so that a flow passage can be formed. As shown in fig. 1, 2, 3, and 4.

Mode two:

if the inner sleeve 3 is propped against the throttling element 2 during installation, the end of the inner sleeve 3 close to the throttling element 2 is provided with a through flow groove, or the inner sleeve 3 is provided with a through flow hole, so that the inner cavity of the inner sleeve 3 is communicated with the corresponding annular cavity (the first annular cavity 4 or the second annular cavity 5).

The opening forms of the flow trough include but are not limited to: square grooves, V-grooves, U-grooves, etc.;

the opening forms of the overflow hole include but are not limited to: round holes, oval holes, kidney-shaped holes, etc.

In this embodiment 1, the first annular cavity 4, the second annular cavity 5 and the inner cavity of the corresponding inner sleeve 3 are all communicated in the first manner.

In this embodiment 1, as shown in fig. 2, a male spigot is disposed on a side of the inner hole of the positioning structure 9, which is close to the output side of the fluid medium of the pressure-bearing pipe body 1, and a female spigot that mates with the male spigot is disposed on a side of the outer peripheral surface of the throttling member 2, which is close to the output side of the fluid medium of the pressure-bearing pipe body 1.

Through setting up public tang and female tang, when throttling element 2 bears the ascending impact of the flow of fluid medium, location structure 9 can be spacing through the cooperation of public tang and female tang, forms the support to throttling element 2 to reduce the atress of fixed junction between throttling element 2 and the location structure 9, form the protection to the fixed junction between throttling element 2 and the location structure 9.

Example 2:

the structure of the annular cavity pressure-taking differential pressure flowmeter provided in embodiment 2 is basically the same as that of embodiment 1, except that: the fixed connection modes between the positioning structure 9 and the pressure-bearing pipe body 1 are different;

as shown in fig. 6, in embodiment 2, a pin and plug welding manner is adopted to fixedly connect the positioning structure 9 and the pressure-bearing pipe body 1;

specifically, a plurality of pin shaft holes are circumferentially arranged on the pressure-bearing pipe body 1 at intervals, each pin shaft hole is internally provided with a pin shaft 8, one end of each pin shaft 8 penetrates into the positioning structure 9 after passing through the pressure-bearing pipe body 1, the other end of each pin shaft 8 is positioned in each pin shaft hole and does not penetrate out of the outer peripheral surface of the pressure-bearing pipe body, and the orifice of each pin shaft hole on the outer peripheral surface of the pressure-bearing pipe body 1 is sealed by plug welding so as to fix the pin shaft 8 in the corresponding pin shaft hole.

Example 3:

the structure of the annular cavity pressure-taking differential pressure flowmeter provided in embodiment 3 is basically the same as that of embodiment 1, except that: the fixed connection mode between the positioning structure 9 and the pressure-bearing pipe body 1 and the fixed connection mode between the positioning structure 9 and the throttling piece 2 are different;

as shown in fig. 7, in embodiment 3, a pin and plug welding manner is adopted to fixedly connect the positioning structure 9, the pressure-bearing pipe body 1 and the throttling element 2;

specifically, a plurality of pin shaft holes are circumferentially arranged on the pressure-bearing pipe body 1 at intervals, each pin shaft hole is internally provided with a pin shaft 8, one end of each pin shaft 8 sequentially penetrates through the pressure-bearing pipe body 1 and the positioning structure 9 and then penetrates into the throttling element 2, the other end of each pin shaft 8 is positioned in each pin shaft hole and does not penetrate out of the outer peripheral surface of the pressure-bearing pipe body, and the orifice of each pin shaft hole on the outer peripheral surface of the pressure-bearing pipe body 1 is sealed by plug welding so as to fix the pin shaft 8 in the corresponding pin shaft hole.

Example 4:

the structure of the annular cavity pressure-taking differential pressure flowmeter provided in embodiment 4 is basically the same as that of embodiment 1, except that: the fixed connection modes between the positioning structure 9 and the pressure-bearing pipe body 1 are different;

as shown in fig. 8, in embodiment 3, a pin+fillet welding manner is used to fixedly connect the positioning structure 9, the pressure-bearing pipe body 1 and the throttling element 2;

specifically, a plurality of pin shaft holes are circumferentially arranged on the pressure-bearing pipe body 1 at intervals, each pin shaft hole is internally provided with a pin shaft 8, one end of each pin shaft 8 penetrates into the positioning structure 9 after penetrating through the pressure-bearing pipe body 1, the other end of each pin shaft 8 penetrates out of the outer peripheral surface of the pressure-bearing pipe body, and one end of each pin shaft 8 penetrating out of the outer peripheral surface of the pressure-bearing pipe body is fixedly connected to the outer peripheral surface of the pressure-bearing pipe body 1 through fillet welding so as to fix the pin shaft 8.

Example 5:

the structure of the annular cavity pressure-taking differential pressure flowmeter provided in embodiment 5 is basically the same as that of embodiment 1, except that: in this embodiment 5, as shown in fig. 9, the positioning structure 9 is an annular protruding portion integrally formed on the inner hole of the pressure-bearing pipe body 1.

Through setting the location structure 9 as the annular protruding portion of integrated into one piece on the hole of pressure-bearing body 1, make location structure 9 can process in the hole course of working of pressure-bearing body 1 and accomplish in the lump, need not to set up location structure 9 as extra equipment part, reduced the processing procedure with location structure 9 fixed connection in pressure-bearing body 1, saved the equipment time.

Example 6:

the structure of an annular cavity pressure-taking differential pressure flowmeter provided in embodiment 6 is substantially the same as that of embodiment 1, except that in embodiment 6, as shown in fig. 10, the orifice plate orifice member is the orifice member 2.

Example 7:

the structure of the annular cavity pressure-taking differential pressure flowmeter provided in embodiment 7 is basically the same as that of embodiment 1, except that: in embodiment 7, at least one projection is provided on the groove bottom of the annular groove, the projection being for abutment with a side of the positioning structure 9 facing the output side of the fluid medium of the pressure-bearing pipe body 1.

By providing the protruding portion, the protruding portion is abutted against the side of the annular member facing the output side of the fluid medium, so that the annular member (i.e. the positioning structure 9) can support the annular member when the annular member and the throttling element 2 bear the impact of the fluid medium in the flow direction, so that the stress of the fixed connection part between the annular member and the pressure-bearing pipe body 1 is reduced, and the fixed connection part between the annular member and the pressure-bearing pipe body 1 is protected.

The protruding portion is arranged in various ways, including but not limited to the following ways:

scheme one:

the protruding portion is annular, and extends along the circumference of ring channel in the quantity of protruding portion is one.

Scheme II:

the number of the convex parts is multiple, and the convex parts are arranged at intervals along the circumferential direction of the annular groove;

the number of projections is related to whether or not the arcuate pieces 91 in the annular member (i.e., the positioning structure 9) are fixedly connected; if the arc pieces 91 are not fixedly connected, the number of the protruding parts is related to the number of the arc pieces 91, at least one or more protruding parts corresponding to each arc piece 91 are at least ensured to be abutted against the corresponding protruding parts, and if the arc pieces 91 are fixedly connected (such as the end-to-end welding connection of the arc pieces 91), the number of the protruding parts is unrelated to the number of the arc pieces 91, and the protruding parts are arranged at intervals along the circumferential direction of the annular groove.

Specifically, in this embodiment 7, as shown in FIG. 11, in order to secure the positioning of the positioning structure 9 in the annular groove, a shoulder is provided at the groove bottom of the annular groove on the downstream side of the installation site of the positioning structure 9 or the annular groove is provided as a stepped groove (i.e., the diameter of the annular groove on the downstream side of the positioning structure 9 is smaller than the diameter of the annular groove on the upstream side of the positioning structure 9)

The positioning structure 9 can also be fixed in the annular groove in a clamping strip fixing mode due to the arrangement of the protruding parts;

specifically, the annular cavity pressure-taking differential pressure flowmeter provided in this embodiment 7 further includes a plurality of clamping strips (not shown in the figure), each clamping strip is disposed at the bottom of the first annular groove 11, each clamping strip is uniformly distributed along the circumferential direction of the first annular groove 11, the uniform ends of each clamping strip are propped against the side surface of the first annular groove 11 far away from the positioning structure 9, and the other ends are propped against the positioning structure 9.

Wherein, the number of the clamping strips is also related to whether the arc-shaped pieces 91 in the annular component (namely the positioning structure 9) are fixedly connected; if the arc pieces 91 are not fixedly connected, the number of the clamping strips is related to the number of the arc pieces 91, at least one or more clamping strips corresponding to each arc piece 91 are at least ensured to be abutted against the arc pieces, and if the arc pieces 91 are fixedly connected (such as the end-to-end welding connection of the arc pieces 91), the number of the clamping strips is unrelated to the number of the arc pieces 91, and the clamping strips are uniformly distributed along the circumferential direction of the first annular groove 11.

Example 8:

the structure of the annular cavity pressure-taking differential pressure flowmeter provided in embodiment 8 is basically the same as that of embodiment 1, except that: as shown in fig. 12 and 13, the inner hole diameter of the positioning structure 9 is larger than the inner hole diameter of the inner sleeve 3; one end of the inner sleeve 3, which faces the positioning structure 9, for shielding the first annular groove 11 is pressed against the throttling element 2, so that the female spigot is in press fit with the male spigot.

The function is that the inner sleeve 3 arranged on the upstream side of the positioning structure 9 can be propped against the throttling element 2, and the male and female rabbets respectively positioned on the throttling element 2 and the positioning structure 9 are in press fit. The method does not need to weld the throttling element 2 on the positioning structure 9, and is suitable for occasions where the inner space of the pressure-bearing pipe body 1 is not suitable for welding operation.

Correspondingly, the communication between the first annular cavity 4 at the upstream of the throttling element 2 and the inner cavity of the corresponding inner sleeve 3 cannot use a mode of leaving a gap, and a mode of slotting at the end part of the inner sleeve 3 close to the throttling element 2 or perforating on the wall of the inner sleeve 3 is adopted.

In this embodiment 8, as shown in fig. 14 and 15, there is a way to block the end of the inner sleeve 3 of the first annular groove 11 near the throttle member 2 from being notched.

Specifically, a plurality of through-flow grooves 31 are formed at one end of the inner sleeve 3 facing the positioning structure 9 for shielding the first annular groove 11, and the through-flow grooves 31 are distributed at intervals along the circumferential direction of the inner sleeve 3 to form an through-flow channel for communicating the first annular cavity 4 with the inner hole of the inner sleeve 3 on the same side.

Example 9:

the structure of the annular cavity pressure-taking differential pressure flowmeter provided in embodiment 9 is basically the same as that of embodiment 8, except that: the arrangement modes of the through-flow channels on the inner sleeve 3 for shielding the first annular groove 11 are different;

in embodiment 9, as shown in fig. 16 and 17, the inner sleeve 3 for shielding the first annular groove 11 is provided with a plurality of flow-through holes 32, and each flow-through hole 32 is distributed at intervals along the circumferential direction of the inner sleeve 3, so as to form a flow-through channel for communicating the first annular cavity 4 with the inner hole of the inner sleeve 3 on the same side.

The annular cavity pressure-taking type differential pressure flowmeter provided by the utility model has at least the following technical effects or advantages:

1. because the pressure-bearing pipe body 1 is integrally formed and has no circumferential butt welding seam, the problems that the bearing capacity of the welding seam is insufficient, stress concentration is insufficient, and the volume nondestructive detection cannot be realized are avoided; compared with a flange connection structure, the sealing surface leakage is avoided, the geometric dimension is compact, the processing technology is simple, and the manufacturing cost and the installation cost are low; the technical problems of complex processing technology and assembly procedures, large occupied space, long production period, high production cost and high safety risk of the existing annular cavity pressure-taking type differential pressure flowmeter are solved.

2. Compared with the welding type of the two-section clamping throttling piece, the welding type welding device has no annular butt welding seam, and avoids the safety risks that the bearing sectional area of the welding seam is insufficient, the root of the welding seam cannot be thoroughly welded, the stress concentration of a welding joint protrudes, the welding joint cannot realize the ray detection, the ultrasonic detection and the like, and the explosion tube leakage is generated.

3. Compared with the flange clamping throttling element, the sealing device avoids the potential risk of leakage of the sealing surface of the flange and the throttling element, and has the advantages of compact structure, simple installation and low manufacturing and installation cost.

4. The opening on the inner sleeve 3 is used as a communication channel between the main fluid channel and the annular cavity, so that fluid in the annular cavity can flow, condensation liquid accumulation is avoided, and the measurement data is more reliable.

5. The throttling element positioning structure and the pressure-bearing pipe body are manufactured separately, so that the difficulty in processing the inside of the pressure-bearing pipe body of the small-specification flowmeter is solved, and the positioning structure adopts a split type, so that the possibility of installation is solved.

6. Through setting up public tang and female tang, when throttling element 2 bears the ascending impact of the flow of fluid medium, location structure 9 can be spacing through the cooperation of public tang and female tang, forms the support to throttling element 2 to reduce the atress of fixed junction between throttling element 2 and the location structure 9, form the protection to the fixed junction between throttling element 2 and the location structure 9.

7. By providing the protruding portion, the protruding portion is abutted against the side of the annular member facing the output side of the fluid medium, so that the annular member (i.e. the positioning structure 9) can support the annular member when the annular member and the throttling element 2 bear the impact of the fluid medium in the flow direction, so that the stress of the fixed connection part between the annular member and the pressure-bearing pipe body 1 is reduced, and the fixed connection part between the annular member and the pressure-bearing pipe body 1 is protected.

8. The inner sleeve 3 arranged on the upstream side of the positioning structure 9 can be abutted against the throttling element 2, and the male and female spigots respectively positioned on the throttling element 2 and the positioning structure 9 are in press fit. The method does not need to weld the throttling element 2 on the positioning structure 9, and is suitable for occasions where the inner space of the pressure-bearing pipe body 1 is not suitable for welding operation.

9. Through setting the location structure 9 as the annular protruding portion of integrated into one piece on the hole of pressure-bearing body 1, make location structure 9 can process in the hole course of working of pressure-bearing body 1 and accomplish in the lump, need not to set up location structure 9 as extra equipment part, reduced the processing procedure with location structure 9 fixed connection in pressure-bearing body 1, saved the equipment time.

The above is only a specific application example of the present utility model, and the protection scope of the present utility model is not limited at all, and the technical solution formed by adopting equivalent transformation or equivalent substitution falls within the protection scope of the present utility model.

Claims (10)

1. The utility model provides a ring cavity pressure-taking differential pressure flowmeter which characterized in that: the hydraulic pressure-bearing pipe comprises a pressure-bearing pipe body, a throttling element and two inner sleeves sleeved in the pressure-bearing pipe body, wherein the pressure-bearing pipe body is used for conveying fluid media, the pressure-bearing pipe body is integrally formed in a whole, and a first annular groove, a positioning structure and a second annular groove are sequentially formed in an inner hole of the pressure-bearing pipe body along the conveying direction of the fluid media;

the first annular groove and the second annular groove are formed along the circumferential direction of the pressure-bearing pipe body, the positioning structure is in a circular ring shape, the positioning structure is coaxial with the pressure-bearing pipe body, and the diameter of an inner hole of the positioning structure is not larger than that of an inner hole of the pressure-bearing pipe body; the throttling piece is assembled in the positioning structure and fixedly connected with the positioning structure, and the outer peripheral surface of the throttling piece is matched with the inner peripheral surface of the positioning structure;

the two inner sleeves are fixedly connected with the pressure-bearing pipe body, the outer peripheral surfaces of the inner sleeves are matched with the inner holes of the pressure-bearing pipe body, and the two inner sleeves are respectively arranged on two sides of the positioning structure and used for respectively shielding the notch of the first annular groove and the notch of the second annular groove; forming a first annular cavity between the first annular groove and the inner sleeve on the same side, and forming a second annular cavity between the second annular groove and the inner sleeve on the same side; the inner sleeves are provided with a through-flow channel; the two through-flow channels are respectively used for communicating the first annular cavity with the inner cavity of the inner sleeve at the same side and communicating the second annular cavity with the inner cavity of the inner sleeve at the same side;

two through holes are formed in the pressure-bearing pipe body, one through hole is used for being communicated with the first annular cavity and the upstream pressure measuring device, and the other through hole is used for being communicated with the second annular cavity and the downstream pressure measuring device.

2. The annular pressure differential flowmeter of claim 1, wherein: one end of the inner sleeve, which is far away from the positioning structure, is welded and connected to the inner hole of the pressure-bearing pipe body.

3. The annular pressure differential flowmeter of claim 1, wherein: the positioning structure is an annular protruding part integrally formed on the inner hole of the pressure-bearing pipe body.

4. The annular pressure differential flowmeter of claim 1, wherein: the inner hole of the pressure-bearing pipe body is provided with an annular groove along the circumferential direction, the positioning structure is an annular member fixedly connected in the annular groove, the outer circumferential surface of the annular member is matched with the groove bottom of the annular groove, and the annular member is used for separating the annular groove into a first annular groove and a second annular groove.

5. The annular pressure differential flowmeter of claim 4, wherein: at least one protruding part is arranged on the bottom of the annular groove and is used for abutting against one side, facing the output side of the fluid medium, of the annular component.

6. The annular pressure differential flowmeter of claim 5, wherein: the number of the protruding parts is one, and the protruding parts are annular and extend along the circumferential direction of the annular groove.

7. The annular pressure differential flowmeter of claim 5, wherein: the annular cavity pressure-taking differential pressure flowmeter further comprises a plurality of clamping strips, each clamping strip is arranged at the bottom of the first annular groove, each clamping strip is uniformly distributed along the circumferential direction of the first annular groove, the uniform end of each clamping strip abuts against the side surface, far away from the positioning structure, of the first annular groove, and the other end of each clamping strip abuts against the positioning structure.

8. The ring cavity pressure differential flow meter according to any of claims 4-7, wherein: the annular member comprises at least three identical arc-shaped pieces, and the arc-shaped pieces are sequentially connected end to end along the circumferential direction of the pressure-bearing pipe body to form a circular ring.

9. The annular pressure differential flowmeter of claim 1, wherein: the inner hole of the positioning structure is provided with a male spigot at one side of the inner hole, which is close to the output side of the fluid medium of the pressure-bearing pipe body, and the outer peripheral surface of the throttling element is provided with a female spigot matched with the male spigot at one side of the outer peripheral surface, which is close to the output side of the fluid medium of the pressure-bearing pipe body.

10. The annular pressure differential flowmeter of claim 9, wherein: the inner diameter of the positioning structure is larger than that of the inner sleeve; one end of the inner sleeve, which is used for shielding the first annular groove, towards the positioning structure is propped against the throttling piece, so that the female spigot is tightly matched with the male spigot.