KR101945395B1 - Flow-control butterfly valve - Google Patents

Abstract

A flow rate adjusting butterfly valve according to the present invention comprises: a valve body forming a flow path and having a valve seat mounted on an inner periphery thereof; And a disk formed in the flow path so as to be rotatable by a shaft so as to have a closed mode for blocking the flow path and an open mode for opening the flow path in accordance with the rotation angle, A front portion which is located on a side facing the valve seat and which is formed to contact the valve seat in the closed mode to cut off the flow passage; And a support portion formed at a rear portion of the front portion, wherein the support portion includes: a shaft support portion formed to support the shaft at a rear middle portion of the front portion; Wherein the valve seat is formed at a position where it is moved toward the upstream side of the passage when the disc is rotated for the open mode, and the opening angle with respect to the valve seat is restricted in the non- A flow control shape portion formed to be protruded and extended to the outside; And a tail portion formed at a portion of the disk that is moved toward the downstream side of the flow path when the disk is rotated for the open mode and formed to have a smaller width toward the downstream side of the flow path.

Description

[0001] FLOW CONTROL BUTTERFLY VALVE [0002]

The present invention relates to a butterfly valve.

A butterfly valve is a valve capable of opening / closing a flow path and controlling flow rate and pressure by a rotation angle of a disk having a rotation axis perpendicular to the flow path. In general, butterfly valves are advantageous in terms of cost because they are easier to manufacture in a smaller size and lighter than other types of valves of the same diameter, and can simplify the entire piping line.

The most commonly used valve type for water flow control valves is the globe valve. The globe valve has a valve body of a substantially spherical shape and forms a vertical passage hole with respect to the inlet and outlet passage straight in the valve body and adjusts the flow rate by moving the disk up and down with respect to the passage hole. Although the operation is accurate and the flow control is precise even in a high pressure environment, it is disadvantageous in that it is large in size and complex, and the manufacturing cost is high and maintenance is difficult.

The butterfly valve realizes a flow rate control or opening / closing action by rotating a circular disk, but the flow rate is rapidly increased when a disk formed in a plate shape is rotated over a certain angle. In addition, the plate-shaped disk is formed in a bifurcated flow path when the flow path is opened. Since the variation of the flow rate due to the increase of the opening degree is also abrupt, the flow rate is also more difficult to control.

* Related Prior Art:

Korean Registered Patent No. 1712632 (Announcement of Mar. 19, 2017)

Korean Patent Publication No. 2005-0107734 (published on November 15, 2005)

Korea Public Utility Model No. 2015-0004069 (Published May 11, 2015)

It is an object of the present invention to improve the shape of a butterfly valve so that the flow rate can be precisely controlled while maintaining the light and economic advantages of the butterfly valve.

It is another object of the present invention to minimize interference by the flow control features to protect the valve seat and to increase its durability.

A flow rate adjusting butterfly valve according to the present invention comprises: a valve body forming a flow path and having a valve seat mounted on an inner periphery thereof; And a disk formed in the flow path so as to be rotatable by a shaft so as to have a closed mode for blocking the flow path and an open mode for opening the flow path in accordance with the rotation angle, A front portion which is located on a side facing the valve seat and which is formed to contact the valve seat in the closed mode to cut off the flow passage; And a support portion formed at a rear portion of the front portion, wherein the support portion includes: a shaft support portion formed to support the shaft at a rear middle portion of the front portion; Wherein the valve seat is formed at a position where it is moved toward the upstream side of the passage when the disc is rotated for the open mode, and the opening angle with respect to the valve seat is restricted in the non- A flow control shape portion formed to be protruded and extended to the outside; And a tail portion formed at a portion of the disk that is moved toward the downstream side of the flow path when the disk is rotated for the open mode and formed to have a smaller width toward the downstream side of the flow path.

According to an embodiment of the present invention, the support portion may be integrally formed with the front portion.

As an example associated with the present invention, the disc is formed by machined steel, and the shaft support may include a machining plane to form a machining datum plane of the disc.

As an example related to the present invention, a fastening hole may be formed in the machining plane so as to fix the disk for cutting the disk.

In one embodiment of the present invention, the front portion is formed to have a cone-shaped circumferential surface in contact with the valve seat in the closed mode, and the first portion of the circumferential surface, corresponding to the flow control feature, The circumferential surface may be formed to be parallel to the central axis of the flow path at the apex.

In one embodiment of the present invention, the second circumferential surface of the circumferential surface corresponding to the tail-like portion is formed to have a predetermined inclination angle with respect to the central axis of the flow path at the vertex and the opposite point of the first circumferential surface .

According to an embodiment of the present invention, the flow control feature may include a cutout shape formed in a chamber immediately after the front face and having a diameter smaller than a diameter of the front face; A connecting portion formed at a predetermined width from the cutout portion to the rear of the flow path; And a curved surface portion formed to the rear of the flow path from the connection shape portion and having a maximum extension length at a position corresponding to a vertex of the first circumferential surface.

In one embodiment of the present invention, the connecting portion may be straight at a position corresponding to a vertex of the first circumferential surface when viewed from the side of the disk.

As an example related to the present invention, the curved surface portion may have an arc shape at a position corresponding to the apex of the first circumferential surface when viewed from the side of the disk.

In one embodiment of the present invention, the width of the connecting feature may be the offset distance of the shaft relative to the front face.

In one embodiment of the present invention, the end surface of the curved surface portion includes a first inclined surface inclined in a direction of a center line of the shaft, and an end surface of the tailed portion has a second inclined surface inclined in the same direction as the first inclined surface. . ≪ / RTI >

In one embodiment of the present invention, the flow rate adjusting butterfly valve may further include a depression groove formed through the shaft supporting portion at a position of the first inclined surface to the end of the second inclined surface.

According to the flow rate control butterfly valve related to the present invention, since the opening gap with the valve seat at the initial rotation angle of the disk is limited by including the disk having the support portion having the flow control feature portion together with the front portion for opening and closing, It is possible to minimize the rapid increase of the flow rate due to the increase of the flow rate, and thus to precisely control the flow rate.

According to one embodiment of the present invention, the flow control shape includes a cutout shape having a diameter smaller than that of the front portion, a connecting shape, and a curved shape portion for performing a flow restriction function at a substantial initial opening, Not only the function but also the effect of reducing the interference of the valve seat and prolonging the service life through non-contact with the valve seat.

Figure 1 is a schematic perspective view of a flow regulating butterfly valve 100 in accordance with the present invention.
Figure 2 is a perspective view of a disk 150 of a flow control butterfly valve in accordance with the present invention.
3 is a side view of the disk 150 of FIG.
4 is a longitudinal sectional view (100) of a flow control butterfly valve of 1. Fig.
5 is a cross-sectional view of the flow regulating butterfly valve 100 of FIG. 4 separated from each state in which the valve is fully opened from the closed mode.
Figure 6 is an image of the flow regulating butterfly valve 100 associated with the present invention which has been fully opened from the closed mode and visualized according to the opening by numerical analysis.
FIG. 7 is a graph showing an opening-flow diagram of a flow-regulating butterfly valve 100 according to the present invention compared with a conventional butterfly valve.

Hereinafter, a flow rate control butterfly valve 100 according to the present invention will be described in detail with reference to the accompanying drawings.

Figure 1 is a schematic perspective view of a flow regulating butterfly valve 100 in accordance with the present invention. The butterfly valve 100 according to the present invention and the flow rate adjusting butterfly valve 100 are provided with a valve body 110 and a disk 150 rotatably installed inside the valve body 110 by a shaft 120. At both ends of the valve body 110, flanges 111 and 112 may be formed for connection with adjacent piping.

The shaft 120 supports an inner disk 150 and transmits an external driving force for adjusting the opening degree represented by the rotation angle of the disk 150. And a driving unit connection part 121 may be provided at an end of the shaft 120. The disk 150 rotates together with the rotation of the shaft 120 and the disk 150 has a closed mode for blocking the internal flow path of the valve body 110 and an open mode for opening the flow path . The opening mode changes according to the rotation angle of the disk 150, and the flow rate thereof also changes.

3 is a side view of the disk 150 of FIG. 2, and FIG. 4 is a longitudinal cross-sectional view of the flow regulating butterfly valve of FIG. 1. FIG. 100).

As shown in these drawings, the disk 150 has a front portion 151 positioned on the upstream side of the flow path as a whole, and a support portion 152 formed on the rear side of the front portion 151. 4, the valve seat 116 is fixed to the inside of the valve body 110 by the fixing ring 115, and the front face portion 151 is in contact with the valve seat 116 in the closed mode, As shown in FIG. Specifically, the front portion 151 has a circumferential surface 151a, 151b in the form of a cone in contact with the valve seat 116 in the closed mode.

The support part 152 may support the disk 150 at the rear of the front part 151 or may have various features for controlling the flow rate. 2 to 4, the support part 152 includes a shaft support part 153 formed to support the shaft 120 in the rear middle of the front part 151, A flow control feature 154 formed at a portion moved toward the upstream side of the viscous flow path and a tail shaped portion 155 formed at a portion moved toward the downstream side of the flow path for rotation of the disk 150 for the open mode.

The support portion 152 may be integrally formed with the front portion 151. [ Here, the disc 150 can be formed by cutting steel. As shown in FIG. 2, the shaft support 153 may include a machining plane 153-1 so as to form a machining reference plane of the disk 150. As shown in FIG. A fastening hole 157 may be formed in the machining plane 153-1 so as to fix the disk 150 for cutting the disk 150. [

The flow control feature 154 can be extended rearward so as to limit the opening gap with the valve seat 116 in a noncontact state with respect to the valve seat 116 at the initial rotational angle of the disk 150. [ This flow control feature 154 alleviates the bifurcation of the channel as the disk 150 enters the open mode, resulting in an abrupt increase in flow rate.

2 and 3, the flow control feature 154 may have a cutout shape 154a, a connecting feature 154b, and a curved feature 154c.

The cutout shape portion 154a is formed in a space immediately after the front portion 151 and may be formed to have a smaller diameter than the front portion 151. [ The cutout shape portion 154a prevents the connecting portion 154b and the curved portion 154c formed at the rear portion from naturally interfering with the inner circumferential surface shape of the valve seat 116 or the valve body 110. [

Meanwhile, as described above, the circumferential surface of the front portion 151 may be formed in the form of a cone in contact with the valve seat 116 in the closed mode. The first circumferential surface 151a of the circumferential surface corresponding to the flow control feature 154 may be formed to be parallel to the central axis of the flow path at the apex. On the other hand, the second circumferential surface 151b corresponding to the tail portion 155 of the circumferential surface may be formed to have a predetermined inclination angle with respect to the center line of the flow path at the vertex and the opposite point of the first circumferential surface 151a. Accordingly, the circumferential surfaces 111 and 112 of the front portion 151 may be in the form of a cone directed toward the peaks of the cone rather than the horns. The front surface portion 151 having the circumferential surfaces 111 and 112 minimizes the interference with the peripheral portion in the opening and closing operation and hence the wear and damage while reducing leakage in the closed mode.

The connection shape portion 154b may be formed to a predetermined width rearward of the flow path from the cutout shape portion 154a. 3, the connecting feature 154b may be straight at a position corresponding to the apex of the first circumferential surface 151a when viewed from the side of the disc 150. [ The width of the connecting portion 154b may be equal to the offset distance of the shaft 120 with respect to the front portion 151. [

The curved surface portion 154c is formed behind the flow path from the connecting portion 154b and is formed to have the maximum extension length at a position corresponding to the apex of the first circumferential surface 151a. 2 and 3, the curved surface portion 154c may have an arc shape at a position corresponding to the apex of the first circumferential surface 151a when viewed from the side of the disk 150. [ Accordingly, the major surface of the curved surface portion 154c keeps the narrow gap open while not contacting the valve seat 116, and alleviates a sharp increase in the flow rate.

The tail-shaped portion 155 is formed at a position where the tail portion 155 is moved toward the downstream side of the flow path for rotation of the disk 150 for the open mode. As shown in FIGS. 2 to 4, the tail-shaped portion 155 may be formed to have a narrower width toward the downstream of the flow path.

3 and 4, the end surface of the curved surface portion 154c may include a first inclined surface 154-1 inclined in the direction of the center line of the shaft 120. [ The end surface of the tail portion 155 may include a second inclined surface 155-1 inclined in the same direction as the first inclined surface 154-1. The first inclined surface 154-1 and the second inclined surface 155-1 are formed in such a manner that a resistance or a vortex of the fluid is generated at a portion except for the flow control portion 154 that suppresses a rapid increase in the flow rate at the initial opening degree. .

As shown in FIG. 2, a depression groove 158 is formed through the shaft supporting portion 153 at one position of the first inclined surface 154-1 to the end of the second inclined surface 155-1. This recessed groove 158 reduces the overall weight of the disk 150, thereby reducing drive energy and facilitating handling. Further, the recessed groove 158 can be formed so as to minimize occurrence of eddy current at the wake of the disk 150 when it is opened.

5 is a cross-sectional view of the flow regulating butterfly valve 100 of FIG. 4 separated from each state in which the valve is fully opened from the closed mode. As shown in FIG. 5 (a), in the closed mode, the front portion 151 is in contact with the valve seat 116 and the flow path is blocked. 5 (b), when the disc 150 rotates slightly, the first circumferential surface 151a, which is the upper end, is separated from the valve seat 116 and a small opening is formed, but the flow rate is small. On the other hand, the second circumferential surface 151b at the lower end is separated from the valve seat 116, and there is no other restriction portion, so that the flow rate is relatively increased. In this state, as shown in FIG. 5 (c), the flow control feature 154 keeps a gap with respect to the valve seat 116 constant until it reaches an opening of about 40 to 50 degrees.

As described above, the flow rate according to the opening degree of the flow rate adjusting butterfly valve 100 related to the present invention is shown in FIG. 6, and FIG. 7 shows the opening-flow rate curve compared with the conventional butterfly valve.

The flow control butterfly valve 100 related to the present invention was manufactured and the flow control degree according to the opening degree was measured. The number of flowmeters in the valve is shown in Equation 1 below.

Here, Q is the flow rate (m 3 / h), G is the density of the fluid (water value = 1), and ΔP is the differential pressure (Bar).

Opening Cv Measured flow value dP P1 P2 5 degrees 37.07 27.60 0.755 0.952 0.197 10 degrees 193.56 142.00 0.733 0.930 0.197 20 degrees 214.32 158.30 0.743 0.943 0.200 30 degrees 331.61 245.10 0.744 0.941 0.197 40 degrees 413.63 309.60 0.763 0.963 0.200 50 degrees 679.73 506.10 0.755 0.955 0.200 60 degrees 1105.51 818.20 0.746 0.948 0.202 70 degrees 1728.60 1264.70 0.729 0.930 0.201 80 degrees 2286.72 1694.70 0.748 0.948 0.200 90 degrees 2697.31 1992.30 0.743 0.929 0.186

That is, as shown in Table 1 above, it was confirmed that the flow rate can be precisely controlled at a flow ratio of about 1:71.

The flow control butterfly valve as described above is not limitedly applied to the configuration and method of the illustrated embodiments. The embodiments may be configured so that all or some of the embodiments may be selectively combined so that various modifications may be made.

100: Flow control butterfly valve 110: Valve body
111, 112: flange 115: retaining ring
116: valve seat 120: shaft
121: driving part connecting part 150: disk
151: front portion 151-1: first circumferential surface
151-2: second circumferential surface 152: support
153: shaft supporting portion 153-1: machining plane
154: flow control shape 154a: cutout shape
154b: connection shape part 154c: curved shape part
154-1: first inclined plane 155:
155-1: second slope 157: fastening hole
158: recessed groove

Claims (12)

A valve body forming a flow path and equipped with a valve seat on its inner periphery; And
And a disk formed in the passage so as to be rotatable by a shaft so as to have a closed mode for blocking the flow path and an open mode for opening the flow path in accordance with the rotation angle,
A front portion positioned on an upstream side of the flow path and configured to contact the valve seat in the closed mode to shut off the flow path; And
And a support portion formed behind the front portion,
The support portion
A shaft support portion formed to be able to support the shaft in a rear middle portion of the front portion;
Wherein the valve seat is formed at a position where it is moved toward the upstream side of the passage when the disc is rotated for the open mode, and the opening angle with respect to the valve seat is restricted in the non- A flow control shape portion formed to be protruded and extended to the outside; And
And a tail-shaped portion formed at a portion of the disk which is moved toward the downstream side of the passage when the disk is rotated for the open mode, the tail-shaped portion being formed so as to be narrower toward the downstream side of the passage,
Wherein the front portion is formed to have a cone-shaped circumferential surface in contact with the valve seat in the closed mode,
The first circumferential surface of the circumferential surface corresponding to the flow control shape is formed to be parallel to the central axis of the flow path at the apex,
The second circumferential surface of the circumferential surface corresponding to the tail is formed at a predetermined inclination angle with respect to the central axis of the flow path at a point opposite to the apex of the first circumferential surface,
Wherein the flow control-
A cutout shaped portion formed in a chamber immediately after the front portion and having a diameter smaller than a diameter of the front portion;
A connecting portion formed at a predetermined width from the cutout portion to the rear of the flow path; And
And a curved portion formed to the rear of the flow path from the connecting portion and formed to have a maximum extension length at a position corresponding to the apex of the first circumferential surface.
The method according to claim 1,
Wherein the support portion is formed integrally with the front portion.
3. The method of claim 2,
The disc is formed by cutting steel,
Wherein the shaft support includes a machining plane to form a machining datum plane of the disk.
The method of claim 3,
And a fastening hole is formed in the machining plane so as to fix the disk for cutting the disk.
delete delete delete The method according to claim 1,
Wherein the connecting feature is straight at a position corresponding to the apex of the first circumferential surface when viewed from the side of the disc.
The method according to claim 1,
Wherein the curved surface portion is circular in shape at a position corresponding to a vertex of the first circumferential surface when viewed from a side surface of the disk.
The method according to claim 1,
Wherein the width of the connecting feature is an offset distance of the shaft relative to the front face.
The method according to claim 1,
Wherein an end surface of the curved surface portion includes a first inclined surface inclined in a direction of a center line of the shaft,
And the end surface of the tail-shaped portion includes a second inclined surface inclined in the same direction as the first inclined surface.
12. The method of claim 11,
Further comprising a depressed groove formed in a position of the first inclined surface to the end of the second inclined surface via the shaft support portion.

Images