Double-eccentric butterfly valve

Abstract

The invention relates to the technical field of valves, and discloses a double-eccentric butterfly valve which comprises a valve body, a valve seat, a valve clack, a valve rod, a supporting ring, a valve seat backing ring and a limiting sleeve. A mounting groove which is opened towards the interior of the flow channel opening is formed in the side wall of the flow channel opening in the valve body; the valve seat is mounted in the mounting groove and partially protrudes out of the mounting groove; the valve clack is installed in the flow channel of the valve body through the valve rod, and the valve clack has a closed state in which the valve clack abuts against the valve seat in a sealing mode to close the flow channel and an open state in which the valve clack is separated from the valve clack to open the flow channel. The valve seat is directly fixed in the valve body, and therefore the problems that due to the fact that the flange end face is of a non-complete structure, when a pipeline is installed, an effective sealing face pressed by a gasket on the flange end face becomes narrow, leakage is prone to occurring, screw connection for fixing the press-fitting ring sleeve is non-integral, and when the pipeline vibrates, screws are prone to loosening can be solved.

Description

Technical Field

[0001] The invention relates to the technical field of valves, and in particular to a double eccentric butterfly valve. Background Art

[0002] Double eccentric butterfly valve is also called high performance butterfly valve. It is mainly used for drainage in water plants, power plants, steel mills, chemical industry, water source projects, environmental facilities construction and other systems. It is especially suitable for use as regulating and intercepting equipment on water pipelines.

[0003] The prior art discloses a double eccentric butterfly valve, which includes a valve body, a valve plate installed in the valve body flow channel through upper and lower valve stems, and a sealing valve seat installed on one side of the valve body flow channel and cooperating with the sealing surface of the valve plate to form a sealing pair. The sealing valve seat is installed in a T-shaped ring groove processed around the inner wall of the valve body flow channel through a press-fit ring sleeve with a flange at its end.

[0004] However, the double eccentric butterfly valve adopts a flanged press-fit ring sleeve to press the sealing valve seat onto the valve body. This structure has the following disadvantages:

[0005] First, the flange end face is not a complete structure. When the pipeline is installed, the gasket is pressed on this surface, and the effective sealing surface becomes narrower, which is prone to leakage.

[0006] Second, the compression ring screw connection is not integral, and the screws are prone to loosening when the pipeline vibrates. Summary of the invention

[0007] In view of this, the present invention provides a double eccentric butterfly valve to solve the problem caused by pressing the sealing valve seat onto the valve body through the press-fit ring sleeve in the current double eccentric butterfly valve.

[0008] In a first aspect, the present invention provides a double eccentric butterfly valve, comprising:

[0009] A valve body, wherein a mounting groove opening toward the inside of the flow channel opening is provided on the side wall of the flow channel opening inside the valve body;

[0010] A valve seat, installed inside the installation groove and partially protruding from the installation groove;

[0011] A valve flap is installed in the flow channel of the valve body through a valve stem, and the valve flap has a closed state in which it abuts and seals with the valve seat to close the flow channel, and an open state in which it is separated from the valve flap to open the flow channel.

[0012] In an optional embodiment, the outer ring of the valve seat is provided with an arc-shaped groove recessed toward the inner direction of the valve seat, and the remaining portion of the outer ring of the valve seat abuts against the bottom wall of the mounting groove.

[0013] In an optional embodiment, the side wall of the valve seat near the outlet end of the internal flow channel abuts against the side wall of the installation groove, and this side wall of the valve seat and the side wall of the installation groove are interference fit.

[0014] In an optional implementation, the inner ring of the valve seat protrudes out of the mounting groove, and the inner ring of the valve seat is in a slope shape that matches the shape of the valve disc sealing surface.

[0015] In an optional embodiment, the valve seat is annular.

[0016] In an optional embodiment, the double eccentric butterfly valve further includes a support ring, which is disposed in a limiting groove on the valve body, and the support ring is located on the side of the valve seat close to the valve stem to provide the valve seat with an extrusion force toward the outlet end of the internal flow channel.

[0017] In an optional embodiment, a space is configured to exist between the support ring and the valve seat, and a drainage hole connecting the valve body flow channel and the space is provided on the support ring.

[0018] In an optional embodiment, the double eccentric butterfly valve further comprises a valve seat gasket ring, wherein the valve seat gasket ring is disposed between the support ring and the valve seat, and the valve seat gasket ring is configured to separate the space between the support ring and the valve seat.

[0019] In an optional embodiment, the double eccentric butterfly valve further comprises a limiting sleeve, wherein the limiting sleeve is arranged on the surface of the valve stem and abuts against a side of the support ring away from the valve seat.

[0020] In an optional embodiment, the support ring is a four-open ring.

[0021] The present invention provides a double eccentric butterfly valve, which has the following advantages:

[0022] 1. The present invention provides a double eccentric butterfly valve, comprising a valve body, a valve seat and a valve disc, wherein a mounting groove opening toward the inner direction of the flow channel opening is provided on the side wall of the flow channel opening inside the valve body; the valve seat is installed inside the mounting groove and partially protrudes out of the mounting groove; the valve disc is installed in the flow channel of the valve body through a valve stem, and the valve disc has a closed state in which it abuts and seals with the valve seat to close the flow channel, and an open state in which it is separated from the valve disc to open the flow channel.

[0023] The double eccentric butterfly valve of this structure is provided with an installation groove opening toward the inside of the flow channel on the side wall of the flow channel inside the valve body, and the valve seat is installed inside the installation groove. After the valve seat is installed inside the installation groove, the valve seat part protrudes out of the installation groove; when the flow channel of the valve body needs to be closed, the valve disc is driven by the valve stem to rotate so that the sealing surface of the valve disc abuts against the valve seat for sealing, thereby achieving closure of the flow channel of the valve body. Similarly, when the flow channel inside the valve body needs to be opened, the valve disc is driven by the valve stem to rotate so that the sealing surface of the valve disc is separated from the valve seat. Compared with the current method of fixing the sealing valve seat to the valve body by a press-fit ring sleeve with a flange, the valve seat is directly fixed inside the valve body in the present invention, thereby avoiding the problems that the effective sealing surface of the gasket pressed on this surface becomes narrower and leakage occurs easily due to the incomplete structure of the flange end face, and the screw connection of the fixed press-fit ring sleeve is not integral, and the screws are easy to loosen when the pipeline vibrates.

[0024] 2. The present invention provides a double eccentric butterfly valve, wherein the outer ring of the valve seat is provided with an arc-shaped groove recessed toward the inner direction of the valve seat, and the remaining part of the outer ring of the valve seat abuts against the bottom wall of the mounting groove.

[0025] The double eccentric butterfly valve of this structure has an arc-shaped groove and arc surface design on the outer ring of the valve seat. Firstly, it reduces the contact area between the valve body and the sealing surface of the outer ring of the valve seat, thereby increasing its sealing specific pressure and achieving better sealing; secondly, it increases the elasticity of the valve seat and controls the sealing specific pressure between the valve seat and the valve disc.

[0026] 3. The present invention provides a double eccentric butterfly valve, wherein the side wall of the valve seat near the outlet end of the internal flow channel abuts against the side wall of the mounting groove, and the side wall of the valve seat and the side wall of the mounting groove are interference fit.

[0027] For a double eccentric butterfly valve of this structure, when the valve is closed, the valve seat is gradually compressed by the valve disc sealing surface, at which time the valve seat and the valve disc sealing surface reach a sealing pressure ratio, and the valve seat and the valve disc are sealed. As the valve disc squeezes the valve seat, the valve seat expands and deforms, and a sealing pressure ratio is formed between the valve seat and the outer ring sealing surface of the valve seat, thereby achieving sealing. In addition, an arc-shaped groove is designed on the outer ring sealing surface of the valve seat. When the valve disc compresses the valve seat and is under pressure, the bottom of the valve seat is expanded to both sides, and the pressure ratio between the valve seat and the side sealing surface of the valve seat is also increased, achieving a reliable second seal. At the same time, due to the existence of the arc-shaped groove on the outer ring sealing surface of the valve seat, the pressure ratio between the valve seat and the valve disc sealing surface can be well controlled, so that the torque of the valve can be controlled.

[0028] 4. The present invention provides a double eccentric butterfly valve, in which a space is configured between the support ring and the valve seat, and a drainage hole connecting the valve body flow channel and the space is provided on the support ring.

[0029] The double eccentric butterfly valve of this structure has a space between the support ring and the valve seat, and the support ring is provided with a drainage hole connecting the valve body flow channel and the space. When in use, the internal medium of the valve body flow channel passes through the drainage hole and fills the space between the support ring and the valve seat. The medium force can push the valve seat, thereby increasing the specific pressure between the valve seat and the side sealing surface of the valve seat, thereby improving its sealing performance.

[0030] 5. The present invention provides a double eccentric butterfly valve, in which the valve disc sealing surface is designed to be a spherical surface. At the same time, the valve stem mounting axis deviates from the sealing surface to form two eccentricities, namely, the upper and lower and left and right. That is, when the valve disc is opened at a certain angle, the valve disc sealing surface is completely separated from the valve seat sealing surface, so that the valve seat is in a completely free state, thereby extending the service life of the valve seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0032] Figure 1 A schematic structural view of a double eccentric butterfly valve provided in an embodiment of the present invention;

[0033] Figure 2 for Figure 1 A magnified view of the structure at the center circle A;

[0034] Figure 3 It is a schematic structural view of a valve flap provided in an embodiment of the present invention.

[0035] Description of reference numerals:

[0036] 1- Valve body;

[0037] 2-valve seat;

[0038] 3-valve disc;

[0039] 4-valve stem;

[0040] 5-Support ring;

[0041] 6-valve seat ring;

[0042] 7-Limiting sleeve;

[0043] 8-Drainage hole. DETAILED DESCRIPTION

[0044] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0046] Example

[0047] This embodiment provides a double eccentric butterfly valve, such as Figure 1 As shown, it includes a valve body 1, a valve seat 2, a valve disc 3, a valve stem 4, a support ring 5, a valve seat gasket 6 and a limiting sleeve 7.

[0048] In this embodiment, a mounting groove opening toward the interior of the flow channel opening is provided on the side wall of the internal flow channel opening of the valve body 1; the valve seat 2 is installed inside the mounting groove and partially protrudes out of the mounting groove; the valve flap 3 is installed in the flow channel of the valve body 1 through the valve stem 4, and the valve flap 3 has a closed state in which it abuts and seals with the valve seat 2 to close the flow channel, and an open state in which it is separated from the valve flap 3 to open the flow channel.

[0049] By providing a mounting groove opening toward the inside of the flow channel opening on the side wall of the flow channel opening inside the valve body 1, the valve seat 2 is installed inside the mounting groove, and after the valve seat 2 is installed inside the mounting groove, the valve seat 2 partially protrudes out of the mounting groove; when the flow channel of the valve body 1 needs to be closed, the valve disc 3 is driven to rotate by the valve stem 4 so that the sealing surface of the valve disc 3 abuts against the valve seat 2 for sealing, thereby achieving the closure of the flow channel of the valve body 1. Similarly, when the flow channel inside the valve body 1 needs to be opened, the valve disc 3 is driven to rotate by the valve stem 4 so that the sealing surface of the valve disc 3 is separated from the valve seat 2. Compared with the current method of fixing the sealing valve seat and the valve body by a press-fitting ring sleeve with a flange, the valve seat 2 is directly fixed inside the valve body 1 in this embodiment, thereby avoiding the problems that the effective sealing surface of the gasket pressed on this surface becomes narrower and leakage occurs easily due to the incomplete structure of the flange end face when the pipeline is installed, and the screw connection of the fixed press-fitting ring sleeve is not integral, and the screws are easy to loosen when the pipeline vibrates.

[0050] In this embodiment, if Figure 2 As shown, the outer ring of the valve seat 2 is provided with an arc-shaped groove which is sunken toward the inside of the valve seat 2, and the remaining part of the outer ring of the valve seat 2 abuts against the bottom wall of the installation groove.

[0051] When in use, the arc-shaped groove arc surface design of the outer ring of the valve seat 2 firstly reduces the contact area between the valve body 1 and the sealing surface of the outer ring of the valve seat 2, thereby increasing its sealing specific pressure and achieving better sealing; secondly, it increases the elasticity of the valve seat 2 and controls the sealing specific pressure between the valve seat 2 and the valve disc 3.

[0052] In this embodiment, if Figure 2 As shown, the side wall of the valve seat 2 near the outlet end of the internal flow channel abuts against the side wall of the installation groove, and this side wall of the valve seat 2 and the side wall of the installation groove are interference fit.

[0053] When the valve is closed, the sealing surface of the valve disc 3 gradually compresses the valve seat 2. At this time, the sealing surface of the valve seat 2 and the valve disc 3 reaches a sealing pressure ratio, and the valve seat 2 and the valve disc 3 are sealed. As the valve disc 3 squeezes the valve seat 2, the valve seat 2 expands and deforms, and a sealing pressure ratio is formed between the valve seat 2 and the outer ring sealing surface of the valve seat 2, thereby achieving sealing. In addition, an arc-shaped groove is designed on the outer ring sealing surface of the valve seat 2. When the valve disc 3 compresses the valve seat 2 and is under pressure, the bottom of the valve seat 2 is stretched to both sides, and the pressure ratio between the valve seat 2 and the side sealing surface of the valve seat 2 will also increase, achieving a reliable second seal. At the same time, due to the existence of the arc-shaped groove on the outer ring sealing surface of the valve seat 2, the pressure ratio between the valve seat 2 and the valve disc 3 sealing surface can be well controlled, so that the torque of the valve can be controlled.

[0054] In a specific embodiment, Figure 2 As shown, the inner ring of the valve seat 2 protrudes the mounting groove, and the inner ring of the valve seat 2 is in a slope shape that matches the shape of the sealing surface of the valve disc 3. This structural design enables the inner ring of the valve seat 2 to better match the sealing surface of the valve disc 3. In this embodiment, the valve seat 2 is annular as a whole and is made of polytetrafluoroethylene.

[0055] In this embodiment, if Figure 1 and Figure 2 As shown, the support ring 5 is arranged in the limiting groove on the valve body 1, and the support ring 5 is located on the side of the valve seat 2 close to the valve stem 4 to provide the valve seat 2 with an extrusion force toward the outlet end of the internal flow channel.

[0056] During assembly, a support ring 5 is provided on the side of the valve seat 2 close to the valve stem 4. The support ring 5 can abut against the side of the valve seat 2 close to the valve stem 4. When the valve is closed, the sealing surface of the valve disc 3 gradually compresses the valve seat 2. In this process, the support ring 5 provides the valve seat 2 with an extrusion force in the direction of the outlet end of the internal flow channel, ensuring that the valve disc 3 squeezes the valve seat 2. When the valve seat 2 is expanded and deformed, a sealing specific pressure is formed between the valve seat 2 and the outer ring sealing surface of the valve seat 2, thereby achieving sealing. When the valve disc 3 compresses the valve seat 2 and is pressurized, the bottom of the valve seat 2 is expanded to both sides, and the specific pressure between the valve seat 2 and the side sealing surfaces of the valve seat 2 can be increased, thereby achieving the above-mentioned second seal.

[0057] In this embodiment, if Figure 2 As shown, a space is configured to exist between the support ring 5 and the valve seat 2, and a drainage hole 8 is provided on the support ring 5 to connect the flow channel of the valve body 1 with the space.

[0058] When in use, a space is provided between the support ring 5 and the valve seat 2, and a drainage hole 8 is provided on the support ring 5 to connect the flow channel of the valve body 1 with the space. When in use, the medium inside the flow channel of the valve body 1 passes through the drainage hole 8 and fills the space between the support ring 5 and the valve seat 2. The medium force can push the valve seat 2, thereby increasing the specific pressure between the valve seat 2 and the side sealing surface of the valve seat 2, thereby improving its sealing performance.

[0059] In this embodiment, if Figure 2 As shown, the valve seat gasket ring 6 is disposed between the support ring 5 and the valve seat 2 , and the valve seat gasket ring 6 is configured to separate a space between the support ring 5 and the valve seat 2 .

[0060] Since a space needs to be provided between the support ring 5 and the valve seat 2, a valve seat cushion ring 6 is provided between the support ring 5 and the valve seat 2. Figure 2 As shown, the valve seat gasket 6 is arranged on the step surface of the support ring 5 to prevent the valve seat gasket 6 or the valve seat 2 from blocking the drainage hole 8, ensuring that the drainage hole 8 is connected to the space between the support ring 5 and the valve seat 2, so that the medium inside the flow channel of the valve body 1 can smoothly pass through the drainage hole 8 and fill the space between the support ring 5 and the valve seat 2.

[0061] Specifically, the support ring 5 in this embodiment is a four-open ring.

[0062] In this embodiment, if Figure 2 As shown, the limiting sleeve 7 is sleeved on the surface of the valve stem 4 and abuts against the side of the support ring 5 away from the valve seat 2. Specifically, the support ring 5 is also provided with a step surface on the side close to the limiting sleeve 7, and the support ring 5 is clamped and limited with the limiting sleeve 7 through the step surface on this side.

[0063] In this embodiment, an integral valve body 1 is adopted, and there is no need to set a pressure ring structure. Only a mounting groove and a limit groove are set on the valve body 1, which has a simple structure and low processing difficulty.

[0064] In this embodiment, if Figure 3 As shown, the sealing surface of the valve disc 3 is designed to be a spherical surface, and the mounting axis of the valve stem 4 deviates from the sealing surface, forming two eccentricities, namely, the upper and lower and left and right. That is, when the valve disc 3 is opened at a certain angle, the sealing surface of the valve disc 3 is completely separated from the sealing surface of the valve seat 2, so that the valve seat 2 is in a completely free state, thereby extending the service life of the valve seat 2.

[0065] As an alternative embodiment, a protrusion may be provided on the side wall of the mounting groove on the valve body 1. After the valve seat 2 is placed in the mounting groove, the protrusion is embedded in the valve seat 2, so that the sealing performance of the valve seat 2 is better.

[0066] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A double eccentric butterfly valve, characterized in that: include: A valve body (1), wherein a mounting groove opening toward the interior of the flow channel opening is provided on a side wall of the flow channel opening inside the valve body (1); A valve seat (2) is installed inside the installation groove and partially protrudes from the installation groove; A valve flap (3) is installed in the flow channel of the valve body (1) through a valve stem (4), and the valve flap (3) has a closed state in which it abuts and seals with the valve seat (2) to close the flow channel, and an open state in which it is separated from the valve flap (3) to open the flow channel.

2. The double eccentric butterfly valve according to claim 1, characterized in that: The outer ring of the valve seat (2) is provided with an arc-shaped groove which is recessed towards the inside of the valve seat (2), and the remaining part of the outer ring of the valve seat (2) is in contact with the bottom wall of the installation groove.

3. The double eccentric butterfly valve according to claim 2, characterized in that: The side wall of the valve seat (2) close to the outlet end of the internal flow channel abuts against the side wall of the installation groove, and this side wall of the valve seat (2) and the side wall of the installation groove are interference fit.

4. The double eccentric butterfly valve according to claim 1, characterized in that: The inner ring of the valve seat (2) protrudes from the mounting groove, and the inner ring of the valve seat (2) is in a slope shape that matches the shape of the sealing surface of the valve flap (3).

5. The double eccentric butterfly valve according to any one of claims 1 to 4, characterized in that: The valve seat (2) is annular.

6. The double eccentric butterfly valve according to claim 1, characterized in that: It also includes a support ring (5), which is arranged in a limiting groove on the valve body (1). The support ring (5) is located on the side of the valve seat (2) close to the valve stem (4) to provide the valve seat (2) with an extrusion force in the direction of the outlet end of the internal flow channel.

7. The double eccentric butterfly valve according to claim 6, characterized in that: A space is arranged between the support ring (5) and the valve seat (2), and a drainage hole (8) is provided on the support ring (5) for connecting the flow channel of the valve body (1) and the space.

8. The double eccentric butterfly valve according to claim 7, characterized in that: It also includes a valve seat gasket (6), which is arranged between the support ring (5) and the valve seat (2), and the valve seat gasket (6) is configured to separate the space between the support ring (5) and the valve seat (2).

9. The double eccentric butterfly valve according to any one of claims 6 to 8, characterized in that: It also comprises a limiting sleeve (7), which is sleeved on the surface of the valve stem (4) and abuts against a side of the support ring (5) away from the valve seat (2).

10. The double eccentric butterfly valve according to claim 9, characterized in that: The support ring (5) is a four-open ring.

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