A triple offset butterfly valve

Abstract

The application relates to the field of butterfly valves, and particularly discloses a three-eccentric butterfly valve which is composed of a valve body, a valve plate and a driving mechanism, a valve seat is fixed on the inner side wall of the valve body, the valve plate is rotationally connected to the valve body, the outer periphery of the valve plate is in abutment with the valve seat, the valve plate is composed of a plate body, a pressing plate ring and a sealing ring, the pressing plate ring is fixed on the plate body through bolts, and a mounting groove is arranged on one side of the plate body close to the pressing plate ring; when the valve plate is closed, the fluid on one side of the valve plate is blocked, the fluid pressure in the pipeline acts on the valve plate, the air bag is extruded and shrinks, the air in the air bag is extruded into the sealing ring through the guide pipe, the sealing ring is expanded, the pressure between the sealing ring and the valve seat is increased, the sealing property between the valve plate and the valve seat is improved, the fluid leakage is reduced, and when the gap between the valve seat and the valve plate is increased due to abrasion, the expanded sealing ring can effectively seal the gap between the valve seat and the valve plate, so that the sealing property between the valve plate and the valve seat is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of butterfly valves, in particular to a three eccentric butterfly valve. BACKGROUND

[0002] The valve stem axis deviates from the disc center and the body center at the same time, and the valve seat rotation axis and the valve body channel axis have a certain angle, which is called three eccentric butterfly valve. In the frequent opening and closing process, the valve plate and the valve seat are constantly rubbed, which can cause the valve plate or the valve seat to wear. Then the gap between the valve plate and the valve seat increases, which causes the fluid to leak through the gap between the valve plate and the valve seat. SUMMARY

[0003] The purpose of the present application is to provide a three eccentric butterfly valve to overcome the above-mentioned defects in the prior art.

[0004] According to the three eccentric butterfly valve of the present application, the valve body, the valve plate and the driving mechanism are composed, a circle of valve seats is fixed on the inner side wall of the valve body, the valve plate is rotationally connected in the valve body, the outer periphery of the valve plate abuts against the valve seat, the valve plate is composed of a plate body, a pressing plate ring and a sealing ring, the pressing plate ring is fixed on the plate body by bolts, an installation groove is formed on one side of the plate body close to the pressing plate ring, the sealing ring is clamped and fixed in the installation groove by the pressing plate ring and the plate body, the sealing ring is hollow inside, two air bags are fixed on the side of the plate body away from the pressing plate ring, a conduit is fixed between the air bags and the sealing ring, and the conduit is in communication with the air bags and the sealing ring.

[0005] Through the above technical scheme, when the valve plate is closed, the fluid is blocked on one side of the valve plate, the fluid pressure in the pipeline acts on the valve plate, the air bags are squeezed and reduced in size, the air in the air bags is squeezed into the sealing ring through the conduit, the sealing ring is expanded, the pressure between the sealing ring and the valve seat is increased, the sealing property between the valve plate and the valve seat is improved, and the fluid leakage is reduced. At the same time, if the gap between the valve seat and the valve plate increases due to wear, the expanded sealing ring can effectively seal the gap between the two, and ensure the sealing property between the valve plate and the valve seat.

[0006] Preferably, the side of the plate body away from the pressing plate ring is convex to form a circular arc convex surface away from the pressing plate ring, the plate body is rotationally connected in the valve body through a valve stem, two mounting seats are fixed on the circular arc convex surface of the plate body, an installation cavity is formed on the side of the mounting seat away from the pressing plate ring, the air bags are fixed in the installation cavity, and the conduit penetrates through the side wall of the installation cavity close to the pressing plate ring.

[0007] Through the above technical scheme, the circular arc convex surface of the plate body can effectively share the pressure of the fluid acting on the plate body, and the air bags fixed in the installation cavity are beneficial to keeping the air bags stable in the fluid.

[0008] Preferably, a positioning ring is fixed on the side of the plate body close to the pressing ring, the positioning ring and the side of the plate body close to the pressing ring form a positioning groove, the pressing ring is fixed in the positioning groove, and the inner diameter of the pressing ring is consistent with the outer diameter of the positioning ring.

[0009] Through the technical scheme, the positioning ring can make the axis of the pressing ring coincide with the axis of the plate body quickly during installation of the pressing ring.

[0010] Preferably, two through grooves are formed in the bottom wall of the positioning groove, and the guide pipe is embedded in the through grooves.

[0011] Through the technical scheme, the through grooves are used to accommodate and support the guide pipe.

[0012] Preferably, two limiting blocks are fixed on the inner side of the pressing ring, the limiting blocks can be embedded in the mounting seat and abut against the outer periphery of the guide pipe.

[0013] Through the technical scheme, after the limiting blocks are embedded in the mounting seat, the pressing ring can be quickly positioned, so that the bolt holes on the pressing ring are quickly aligned with the bolt holes on the plate body, and the limiting blocks abut against the outer periphery of the guide pipe, so that the guide pipe is limited in the mounting seat.

[0014] Preferably, the part of the plate body close to the pressing ring and located in the pressing ring is recessed to form a circular arc concave surface away from the pressing ring, and two horizontally arranged rib plates are fixed on the circular arc concave surface of the plate body.

[0015] Through the technical scheme, the circular arc concave surface of the plate body can reduce the weight of the plate body while ensuring the strength of the plate body, and the rib plates can further improve the deformation resistance of the plate body.

[0016] Preferably, the side of the rib plate close to the pressing ring is flush with the bottom wall of the positioning groove, a sealing plate parallel to the rib plate is fixed on the inner side of the pressing ring, two sealing strips abutting against the rib plate are fixed on the side of the sealing plate close to the rib plate, a sealing space is formed between the sealing strips, the positioning ring, the rib plate and the circular arc concave surface of the plate body, and the guide pipe is located in the sealing space.

[0017] Through the technical scheme, the guide pipe is accommodated in the sealing space, so that the impact of fluid on the guide pipe can be avoided when the valve plate is opened.

[0018] The beneficial effect of the present application is that when the valve plate is closed, the fluid on one side of the valve plate is blocked, the fluid pressure in the pipeline acts on the valve plate, the air bag is squeezed and shrinks, the air in the air bag is squeezed into the sealing ring through the guide pipe, the sealing ring is expanded, the pressure between the sealing ring and the valve seat is increased, the sealing between the valve plate and the valve seat is improved, the fluid leakage is reduced, and when the gap between the valve seat and the valve plate increases due to wear, the expanded sealing ring can effectively block the gap between the two, ensuring the sealing between the valve plate and the valve seat. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a structural schematic diagram of the present application;

[0020] Figure 2 is an exploded view of the present application;

[0021] Figure 3 is an enlarged schematic view of A in the present application Figure 2 ;

[0022] Figure 4 is a horizontal sectional view of the present application;

[0023] Figure 5 is an enlarged schematic view of B in the present application Figure 4 ;

[0024] Figure 6 is a structural schematic diagram of the pressure plate ring in the present application;

[0025] Figure 7 is an enlarged schematic view of C in the present application Figure 6 ;

[0026] Figure 8 is a structural schematic diagram of the plate body in the present application;

[0027] Figure 9 is an enlarged schematic view of D in the present application Figure 8 ;

[0028] Figure 10 is a structural schematic diagram of the mounting cavity in the present application.

[0029] In the drawings:

[0030] 10, valve body; 20, plate body; 201, mounting groove; 202, positioning groove; 203, positioning ring; 204, mounting seat; 205, mounting cavity; 206, through groove; 21, pressure plate ring; 211, sealing plate; 212, sealing strip; 213, limiting block; 22, sealing ring; 221, air bag; 222, guide pipe; 23, rib plate; 30, valve rod; 40, driving mechanism. DETAILED DESCRIPTION

[0031] In the description of the present application, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the drawings shown, only for the convenience of describing the simplified description of the present application, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. Figure 1

[0032] In order to make the purpose and advantages of the present application more clear and obvious, the present application is specifically described below in combination with examples, which should be understood as follows: the following text is only used to describe one or several specific embodiments of the present application, and does not strictly limit the protection scope of the present application, as used herein, the terms up and down and left and right are not limited to their strict geometric definitions, but include reasonable and inconsistent tolerances for machining or human error, and the specific features of the three eccentric butterfly valve are described in detail as follows:

[0033] One embodiment of the present application:

[0034] With reference to Figures 1-10 , the present application provides a three eccentric butterfly valve, which comprises a valve body 10, a valve plate and a driving mechanism 40, a valve seat is fixed on the inner side wall of the valve body 10, the valve plate is rotatably connected to the valve body 10, the outer periphery of the valve plate abuts against the valve seat, the valve plate comprises a plate body 20, a pressing plate ring 21 and a sealing ring 22, the pressing plate ring 21 is fixed on the plate body 20 by bolts, an installation groove 201 is formed on one side of the plate body 20 close to the pressing plate ring 21, the sealing ring 22 is clamped and fixed in the installation groove 201 by the pressing plate ring 21 and the plate body 20, the sealing ring 22 is hollow inside, two air bags 221 are fixed on the side of the plate body 20 away from the pressing plate ring 21, a conduit 222 is fixed between the air bag 221 and the sealing ring 22, and the conduit 222 is in communication with the air bag 221 and the sealing ring 22.

[0035] With reference to Figure 1 , Figure 2 , Figure 10 , the side of the plate body 20 away from the pressing plate ring 21 is convex to form a circular arc convex surface away from the pressing plate ring 21, the plate body 20 is rotatably connected to the valve body 10 through a valve rod 30, two mounting seats 204 are fixed on the circular arc convex surface of the plate body 20, an installation cavity 205 is formed on the side of the mounting seat 204 away from the pressing plate ring 21, the air bag 221 is fixed in the installation cavity 205, the conduit 222 penetrates through the installation cavity 205 and is close to the side wall of the pressing plate ring 21, a worm gear is arranged in the driving mechanism 40, and the torque of a rotating disc on the driving mechanism 40 is increased and then transmitted to the valve rod 30 through the transmission of the worm gear.

[0036] With reference to Figure 2 ,​Figure 3 The plate body 20 is fixed with a positioning ring 203 on the side close to the pressing plate ring 21, the positioning ring 203 and the side of the plate body 20 close to the pressing plate ring 21 form a positioning groove 202, and the pressing plate ring 21 is fixed in the positioning groove 202, and the inner diameter of the pressing plate ring 21 is consistent with the outer diameter of the positioning ring 203.

[0037] Referring to Figure 3 Two through grooves 206 are formed in the bottom wall of the positioning groove 202, and the guide pipe 222 is embedded in the through grooves 206.

[0038] Referring to Figure 3 、 Figure 6 、 Figure 7 、 Figure 10 Two limiting blocks 213 are fixed on the inner side of the pressing plate ring 21, the limiting blocks 213 can be embedded in the mounting seat 204 and abut against the outer periphery of the guide pipe 222.

[0039] Referring to Figure 2 、 Figure 3 、 Figure 8 The part of the plate body 20 close to the pressing plate ring 21 and located in the pressing plate ring 21 is recessed to form a circular arc concave surface away from the pressing plate ring 21, and two horizontally arranged rib plates 23 are fixed on the circular arc concave surface of the plate body 20.

[0040] Referring to Figure 2 、 Figures 6-8 The side of the rib plate 23 close to the pressing plate ring 21 is flush with the bottom wall of the positioning groove 202, a sealing plate 211 parallel to the rib plate 23 is fixed on the inner side of the pressing plate ring 21, two abutting sealing strips 212 are fixed on the side of the sealing plate 211 close to the rib plate 23, a sealing space is formed between the sealing strips 212, the positioning ring 203, the rib plate 23 and the circular arc concave surface of the plate body 20, and the guide pipe 222 is located in the sealing space.

[0041] In use, the valve body 10 is fixed between two pipes by bolts, the valve plate is rotated by 90 degrees by rotating the rotating disc on the driving mechanism 40, the valve stem 30 is rotated by the transmission of the worm and gear in the driving mechanism 40, and the three eccentric butterfly valve is opened, so that the fluid passes through.

[0042] The rotating disc on the driving mechanism 40 is rotated in the opposite direction, the valve plate is rotated in the opposite direction by 90 degrees, the three eccentric butterfly valve is closed, the fluid is blocked by the valve plate, the fluid pressure in the pipe acts on the air bag 221, the air bag 221 is squeezed, the air in the air bag 221 is squeezed into the sealing ring 22 through the guide pipe 222, the sealing ring 22 is expanded, the pressure when the sealing ring 22 abuts against the valve seat is increased, and the sealing property between the valve plate and the valve seat is ensured.

[0043] Those skilled in the art will clearly understand that various modifications can be made to the above embodiments without departing from the general spirit and scope of the present application. All such modifications are intended to fall within the scope of the present application. The scope of the present application is defined by the appended claims.

Claims

1. A triple offset butterfly valve, comprising a valve body (10), a valve plate and a driving mechanism (40), a valve seat is fixed on the inner side wall of the valve body (10), the valve plate is rotatably connected in the valve body (10), and the outer periphery of the valve plate abuts against the valve seat, characterized in that: The valve plate comprises a plate body (20), a pressing plate ring (21) and a sealing ring (22), the pressing plate ring (21) is fixed on the plate body (20) by bolts, one side of the plate body (20) close to the pressing plate ring (21) is provided with an installation groove (201), the sealing ring (22) is fixed in the installation groove (201) by the pressing plate ring (21) and the plate body (20), the sealing ring (22) is hollow, two air bags (221) are fixed on the side of the plate body (20) away from the pressing plate ring (21), a conduit (222) is fixed between the air bags (221) and the sealing ring (22), and the conduit (222) is in communication with the air bags (221) and the sealing ring (22).

2. A triple offset butterfly valve according to claim 1, characterized in that: The side of the plate body (20) away from the pressing plate ring (21) is formed as a circular arc convex surface protruding away from the pressing plate ring (21), the plate body (20) is rotationally connected in the valve body (10) through a valve rod (30), two installation seats (204) are fixed on the circular arc convex surface of the plate body (20), the installation seats (204) are provided with installation cavities (205) on the side away from the pressing plate ring (21), the air bags (221) are fixed in the installation cavities (205), and the conduit (222) penetrates through the installation cavities (205) and is close to the side wall of the pressing plate ring (21).

3. A triple offset butterfly valve according to claim 1, characterized in that: A positioning ring (203) is fixed on the side of the plate body (20) close to the pressing plate ring (21), the positioning ring (203) and the side of the plate body (20) close to the pressing plate ring (21) form a positioning groove (202), the pressing plate ring (21) is fixed in the positioning groove (202), and the inner diameter of the pressing plate ring (21) is consistent with the outer diameter of the positioning ring (203).

4. A triple offset butterfly valve according to claim 3, wherein: Two through grooves (206) are formed in the bottom wall of the positioning groove (202), and the conduit (222) is embedded in the through grooves (206).

5. A triple offset butterfly valve according to claim 4, characterised in that: Two limiting blocks (213) are fixed on the inner side of the pressing plate ring (21), the limiting blocks (213) can be embedded in the installation seats (204) and abut against the outer periphery of the conduit (222).

6. A triple offset butterfly valve according to claim 3, wherein: The part of the plate body (20) close to the pressing plate ring (21) and located in the pressing plate ring (21) is recessed to form a circular arc concave surface away from the pressing plate ring (21), and two horizontally arranged rib plates (23) are fixed on the circular arc concave surface of the plate body (20).

7. A triple offset butterfly valve according to claim 6, characterised in that: The side of the rib plate (23) close to the pressing plate ring (21) is flush with the bottom wall of the positioning groove (202), a sealing plate (211) parallel to the rib plate (23) is fixed on the inner side of the pressing plate ring (21), two sealing strips (212) abutting against the rib plate (23) are fixed on the side of the sealing plate (211) close to the rib plate (23), a sealing space is formed between the sealing strips (212), the positioning ring (203), the rib plate (23) and the circular arc concave surface of the plate body (20), and the conduit (222) is located in the sealing space.

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