CN118208561A - Butterfly valve without on-off resistance - Google Patents

Abstract

The invention discloses a butterfly valve without opening and closing resistance, which comprises a valve body, a valve rod rotatably supported on the valve body and a valve disc arranged on one side of the valve rod, wherein a valve disc sealing surface is arranged on the periphery of the valve disc, a movable seat ring is movably arranged on the valve body along the axial direction of the valve body, the movable seat ring comprises a ring-shaped sealing seat part positioned at one end, the other end of the movable seat ring opposite to the sealing seat part is inserted into an annular cavity between a guide sleeve arranged at one end of the valve body and the valve body, the inner peripheral surface of the sealing seat part is a seat ring sealing surface jointed with the valve disc sealing surface, and the seat ring sealing surface and the valve disc sealing surface form a butterfly valve sealing pair. The butterfly valve without opening and closing resistance can avoid extrusion and scraping of the valve disc and the valve seat in the opening and closing process, and can ensure that the sealing of the butterfly valve without leakage.

Description

Butterfly valve without on-off resistance

Technical Field

The invention relates to a valve, in particular to a butterfly valve.

Background

Butterfly valves are a commonly used restriction device in liquid delivery lines that sealingly close the valve disc periphery by engaging a valve seat on the valve body and open a liquid passageway by rotating a valve stem to drive the valve disc to rotate so that the valve disc periphery is out of contact with the valve seat. In order to ensure the sealing performance of the butterfly valve, the sealing pair is basically made of elastic materials, and the clearance between the two sealing surfaces of the sealing pair is eliminated by utilizing the elastic deformation of the two sealing surfaces of the sealing pair, so that the valve disc and the valve seat are always in an extrusion state, the resistance in the opening and closing process is large, the rubbing is serious, the abrasion is quick, the opening and closing are difficult, the service life is short when the butterfly valve is used, and the problems of incomplete extrusion scraping elimination, inconvenience in design and manufacture and high opening and closing resistance are still existed although the structures of single eccentric, double eccentric, triple eccentric and the like are adopted to solve the extrusion problem of the butterfly disc and the valve seat.

Disclosure of Invention

The invention aims to solve the technical problem of providing a butterfly valve without opening and closing resistance, which can avoid extrusion and scraping of a valve disc and a valve seat in the opening and closing process and can ensure that the sealing of the butterfly valve is free from leakage.

In order to solve the technical problems, the invention provides a butterfly valve without on-off resistance, which comprises a valve body, a valve rod rotatably supported on the valve body and a valve disc arranged on one side of the valve rod, wherein the periphery of the valve disc is provided with a valve disc sealing surface, a movable seat ring is movably arranged on the valve body along the axial direction of the valve body, the movable seat ring comprises an annular sealing seat part, the inner circumferential surface of the sealing seat part is a seat ring sealing surface jointed with the valve disc sealing surface, and the seat ring sealing surface and the valve disc sealing surface form a butterfly valve sealing pair.

After the technical scheme is adopted, the movable seat ring can axially change the position along the valve body, when the movable seat ring is positioned at the inner side, the inner peripheral surface of the sealing seat part on the movable seat ring is tightly attached to the sealing surface of the valve disc, the butterfly valve is in a sealing closed state, when the butterfly valve needs to be opened, the movable seat ring is outwards shifted, the inner peripheral surface of the sealing seat part is separated from the sealing surface of the valve disc and is a certain distance away, then the valve rod drives the valve disc to rotate, the butterfly valve can be easily opened, when the butterfly valve needs to be closed, the valve disc is rotated to a position vertical to the axis of the valve body, and then the movable seat ring is driven to inwards shift, so that the inner peripheral surface on the sealing seat part is tightly attached to the sealing surface of the valve disc, the butterfly valve can be closed and the sealing can be ensured not to leak, and the sealing surface of the valve disc can not be in any contact with the inner peripheral surface of the sealing seat part in the rotating process of the opening and closing process of the butterfly valve, so that extrusion and scraping between the butterfly valve can not be generated, the resistance of the opening and closing process is very small, and the service life of the butterfly valve is prolonged.

In a preferred embodiment of the invention, a guide sleeve is fixedly connected to the valve body, and the movable seat ring is inserted between the periphery of the inner end of the guide sleeve and the valve body. With this embodiment, the stability of the movable seat ring displacement in the axial direction of the valve body can be ensured.

In another preferred embodiment of the present invention, the sealing seat is connected to the annular piston portion through a connecting sleeve portion, the outer peripheral diameter of the annular piston portion is larger than the outer peripheral diameter of the connecting sleeve portion, the inner periphery of the annular piston portion is in sealing connection with the outer periphery of the inner end of the guide sleeve, the outer periphery of the annular piston portion and the outer periphery of the connecting sleeve portion are respectively in sealing connection with corresponding circumferential surfaces on the valve body, two communication holes are arranged on the valve body, and the two communication holes are respectively located on the outer side and the inner side of the annular piston portion. By adopting the embodiment, the outer side end surface of the annular piston part forms a closed loop cavity together with the guide sleeve and the valve body, the inner side end surface of the annular piston part forms another closed loop cavity together with the outer peripheral surface of the connecting sleeve part and the valve body, and the two closed loop cavities are communicated with an external hydraulic source through corresponding communication holes, so that the movable seat ring can be conveniently and rapidly driven to axially shift along the valve body through the hydraulic pressure of an external hydraulic system, the separation contact between the sealing surface of the valve disc and the sealing surface of the seat ring in the valve disc rotating process when the butterfly valve is opened and closed is ensured, and the sealing surface of the seat ring can be kept tightly attached to the sealing surface of the valve disc under the hydraulic action after the butterfly valve is closed, and the sealing of the butterfly valve sealing pair is further ensured to be free from leakage.

In a further preferred embodiment of the present invention, an elastic sealing ring is mounted on the valve disk, and the outer peripheral surface of the elastic sealing ring is a valve disk sealing surface. By adopting the embodiment, the sealing surface of the valve disc and the sealing surface of the seat ring can be better closely attached through the elastic sealing ring, and the sealing effect is better when the butterfly valve is closed.

In a further preferred embodiment of the invention, the elastic sealing ring is embedded on the valve disk by a clamping ring. With this embodiment, the installation and replacement of the elastic sealing ring can be facilitated.

In another further preferred embodiment of the present invention, the race seal surface is a conical surface. By adopting the embodiment, the seat ring sealing surface can play a certain wedging role on the sealing surface of the valve disc, the sealing effect is good, and meanwhile, the axial stroke of the movable seat ring can be shortened, so that the butterfly valve is compact in structure.

Drawings

The non-opening and closing resistance butterfly valve of the invention is further described in detail below with reference to the accompanying drawings and specific examples.

FIG. 1 is a schematic diagram of an embodiment of a butterfly valve without on-off resistance according to the present invention;

FIG. 2 is an enlarged view of a portion of the structure shown in FIG. 1 at location A;

fig. 3 is a schematic view of the movable race in the configuration shown in fig. 1.

In the figure: 1-valve rod, 2-communication hole, 3-valve body, 4-movable seat ring, 41-sealing seat, 42-annular piston, 43-connecting sleeve, 44-seat sealing surface, 5-butterfly valve sealing pair, 6-guide sleeve, 7-valve disc, 71-valve disc sealing surface, 8-elastic sealing ring and 9-pressing ring.

Detailed Description

In the butterfly valve without opening and closing resistance shown in fig. 1 and 2, a valve body 3 is a ring-shaped member, flanges connected with corresponding liquid inlet side or liquid outlet side pipelines are arranged at two ends of the valve body 3, a valve rod 1 is rotatably and hermetically inserted in the middle of the valve body 3 and is perpendicular to the axis of the inner cavity of the valve body 3, a valve disc 7 is arranged at the position, located in the inner cavity of the valve body 3, of one side of the valve rod 1, the valve disc 7 is a disc-shaped member, a valve disc sealing surface 71 is arranged on the periphery of the valve disc 7, an elastic sealing ring 8 is arranged on the valve disc 7 in a preferable implementation manner, and the outer periphery of the elastic sealing ring 8 protrudes out of the disc body of the valve disc 7 through a pressing ring 9, namely the valve disc sealing surface 71. The movable seat ring 4 is movably arranged on the valve body 3 along the axial direction of the valve body, the movable seat ring 4 comprises an annular sealing seat part 41 positioned at the inner end, as a preferred embodiment, one end of the movable seat ring 4 is fixedly connected with a guide sleeve 6, the outer end of the guide sleeve 6 is sealed with the valve body 3 through a sealing ring, the outer periphery of the inner end of the guide sleeve 6 and the valve body 3 form an annular cavity, one end, opposite to the sealing seat part 41, of the movable seat ring 4 is inserted into the annular cavity between the outer periphery of the inner end of the guide sleeve 6 and the valve body 3, the sealing seat part 41 is connected with an annular piston part 42 through a connecting sleeve part 43, the outer periphery of the annular piston part 42 is larger than the outer periphery of the connecting sleeve part 43, the inner periphery of the annular piston part 42 and the outer periphery of the inner end of the guide sleeve 6 are respectively connected with the corresponding circumferential surface on the valve body 3 through sealing rings, the inner periphery of the sealing seat part 41 is a sealing ring 44 which is a sealing surface 44 attached to a valve disc sealing surface 71, the sealing ring sealing surface 44 and the sealing disc sealing surface 71 forms a sealing pair 5, and the sealing surface 44 is preferably a conical surface.

The valve body 3 is provided with two communication holes 2, the two communication holes 2 are respectively positioned at the outer side and the inner side of the annular piston part 42, the inner end of the communication hole 2 positioned at the outer side of the annular piston part 42 is communicated with a closed annular cavity formed by the outer side end surface of the annular piston part 42, the guide sleeve 6 and the valve body 3, the inner end of the communication hole 2 positioned at the inner side of the annular piston part 42 is communicated with another closed annular cavity formed by the inner side end surface of the annular piston part 42, the outer peripheral surface of the connecting sleeve part 43 and the valve body 3, and the outer ends of the two communication holes 2 are communicated with an external hydraulic source, so that the movable seat ring 4 can be conveniently and rapidly driven to axially shift along the valve body 3 by the hydraulic pressure of an external hydraulic system, the valve disc 7 is separated from contact with the seat ring sealing surface 44 in the rotating process when the butterfly valve is opened and closed, the extrusion and scraping of the valve disc 7 and the valve seat in the opening and closing process are avoided, and the sealing of the butterfly valve is ensured to be free from leakage.

The foregoing is merely illustrative of some preferred embodiments of the present invention, but the invention is not limited thereto and many modifications and variations are possible. Instead of being driven by an external hydraulic system through the communication hole 2, the movable race 4 may be driven by a mechanism driving mechanism such as a fork supported by the valve body 3. Such and the like, as long as the modifications and the changes are made on the basis of the basic principles of the present invention, are to be regarded as falling within the scope of the present invention.

Claims (6)

1. The utility model provides a no resistance butterfly valve that opens and close, includes valve body (3), valve rod (1) of slewing bearing on valve body (3) and installs valve disc (7) in valve rod (1) one side, and valve disc (7) periphery is equipped with valve disc sealing surface (71), its characterized in that: a movable seat ring (4) is movably arranged on the valve body (3) along the axial direction of the valve body, the movable seat ring (4) comprises an annular sealing seat part (41), the inner circumferential surface of the sealing seat part (41) is a seat ring sealing surface (44) jointed with a valve disc sealing surface (71), and the seat ring sealing surface (44) and the valve disc sealing surface (71) form a butterfly valve sealing pair (5).

2. The non-opening and closing resistance butterfly valve of claim 1, wherein: the valve body (3) is fixedly connected with a guide sleeve (6), and the movable seat ring (4) is inserted between the periphery of the inner end of the guide sleeve (6) and the valve body (3).

3. The non-opening and closing resistance butterfly valve of claim 2, wherein: the sealing seat part (41) is connected with the annular piston part (42) through the connecting sleeve part (43), the outer circumference diameter of the annular piston part (42) is larger than the outer circumference diameter of the connecting sleeve part (43), the inner circumference of the annular piston part (42) is in sealing connection with the outer circumference of the inner end of the guide sleeve (6), the outer circumference of the annular piston part (42) and the outer circumference of the connecting sleeve part (43) are respectively in sealing connection with the corresponding circumferential surface on the valve body (3), two communication holes (2) are formed in the valve body (3), and the two communication holes (2) are respectively located on the outer side and the inner side of the annular piston part (42).

4. The non-opening and closing resistance butterfly valve of claim 1, wherein: an elastic sealing ring (8) is mounted on the valve disc (7), and the outer peripheral surface of the elastic sealing ring (8) is a valve disc sealing surface (71).

5. The non-opening and closing resistance butterfly valve of claim 4, wherein: the elastic sealing ring (8) is embedded on the valve disc (7) through the pressing ring (9).

6. The non-opening and closing resistance butterfly valve of claim 1, wherein: the seat ring sealing surface (44) is a conical surface.