High-frequency sealing three-eccentric center butterfly valve

Abstract

The utility model discloses a high-frequency sealing three-eccentric center butterfly valve. The high-frequency action has small influence on the sealing ring and the valve seat, the sealing performance of the butterfly valve is guaranteed, and the service life of the valve is long. The utility model relates to a blow-out prevention valve, which comprises a valve body, a valve rod, a valve plate and a valve seat are arranged in the valve body, the valve rod penetrates through the valve body, and the valve plate is mounted on the valve rod through a flat key and a shaft pin, and is characterized in that the top end and the bottom end of the valve rod are respectively provided with a blow-out prevention structure and a bottom wear-resistant structure by taking the valve rod as a center; a valve seat is installed on an annular protrusion of the inner wall of the valve body, and a pressing ring reverse installation structure is arranged close to the valve seat and around the valve plate.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of sealing butterfly valve, specifically relates to a high frequency sealing three eccentric butterfly valve. BACKGROUND

[0002] Pressure swing adsorption device is a kind of equipment based on pressure swing adsorption technology, and the pressure swing adsorption device is widely used in industrial gas purification, environmental protection field, petrochemical and food and beverage and other industries with its high efficiency, low cost and wide applicability.Pressure swing adsorption device needs to use high-frequency sealing three eccentric butterfly valve, high-frequency action three times a minute, fast action, the requirement of valve is higher, the existing high-frequency sealing three eccentric butterfly valve can generate strong impact force under the condition of high-frequency action, the service life of valve is shorter, and the sealing ring and valve seat are influenced, leading to the destruction of butterfly valve sealing. UTILITY MODEL CONTENTS

[0003] In view of the defects that the existing high-frequency sealing three eccentric butterfly valve is short in service life under high-frequency action, and influences sealing ring and valve seat, leading to the destruction of butterfly valve sealing, the utility model provides a high-frequency sealing three eccentric butterfly valve, high-frequency action, less influence on sealing ring and valve seat, the sealing property of butterfly valve is guaranteed, and the service life of valve is longer.

[0004] The utility model provides the following technical scheme:

[0005] It includes valve body, and valve rod, valve plate and valve seat are arranged in the valve body, the valve rod is installed in valve body, and the valve plate is installed on the valve rod by means of flat key and shaft pin, and its characterized in that: the valve rod is as the center, and blowout prevention structure and bottom wear-resistant structure are arranged at the top end and bottom end of the valve rod respectively, the inner wall ring of the valve body is protruded to install valve seat, is close to the valve seat, and the pressure ring reverse installation structure is arranged around the valve plate.

[0006] It is further characterized in that:

[0007] The compression ring reverse mounting structure comprises a segmented compression ring embedded in the inner wall of a valve body, a circular ring protrusion of the inner wall of the valve body arranged near a valve rod, a valve seat compressed on the circular ring side wall surface of the circular ring protrusion, a bolt compressed between the valve seat and the segmented compression ring, one end of the bolt threadedly connected with the segmented compression ring, the other end of the bolt pressing the valve seat, a spring externally sleeved on the bolt, both ends of the spring pressing the segmented compression ring and a nut of the bolt, and a first sealing ring arranged at the joint of the valve seat and the valve body.

[0008] The blowout prevention structure comprises a valve body and a valve rod, and the space surrounded by the valve body and the valve rod is sequentially filled with a packing pad, packing and a packing gland from inside to outside.

[0009] The bottom wear-resistant structure comprises a thrust bearing mounted at the end of the bottom of the valve rod and connected with the valve rod through a screw, a friction gasket and a bottom cover sequentially compressed at the bottom end of the thrust bearing, the bottom cover connected with the valve body through a screw, and a second winding gasket arranged at the joint of the bottom cover and the valve body.

[0010] The valve rod body in contact with the valve body is sleeved with a shaft sleeve.

[0011] In the above technical scheme, the technical effects and advantages of the utility model are as follows:

[0012] The setting of the friction gasket in the bottom wear-resistant structure can drive the friction gasket to rotate on the bottom cover by using the hexagonal head of the screw for mounting the thrust bearing when the valve rod rotates, so that the rotating friction loss of the valve rod is reduced, and the service life of the valve is ensured.

[0013] The setting of the blowout prevention structure improves the overall safety performance of the valve, prevents the valve rod from flying out after being broken due to high-frequency operation, and improves the overall safety performance of the device.

[0014] And the spring bolt is installed in the segmented compression ring to press against the valve seat in the compression ring reverse structure, the compression ring and the sealing ring are sequentially sleeved on the valve plate, the sealing performance of the whole valve can be guaranteed under high frequency working condition, even if the sealing element of the valve is damaged, the structure also has the function of replacing the sealing spare part, when the valve operates at high frequency, the spring bolt and the spring force play a double compression on the valve seat, so that the sealing ring and the valve seat are less affected, the sealing performance of the butterfly valve is guaranteed, and the service life of the valve is further guaranteed.

[0015] The first sealing ring, the second sealing ring and the first wrapped gasket and the first wrapped gasket increase the sealing performance between the corresponding components, and the sealing performance of the butterfly valve is further guaranteed. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 It is a schematic view of the overall structure and a partial sectional view of the utility model;

[0017] Figure 2 It is Figure 1 A structure schematic view from the top;

[0018] Figure 3 It is Figure 1 A schematic view of the A-A sectional view.

[0019] BRIEF DESCRIPTION OF DRAWINGS:

[0020] 1, valve body;2, valve rod;3, valve plate;4, valve seat;5, packing pressing plate;6, packing gland;7, packing;8, packing pad;9, connecting piece;10, flat key;11, shaft pin;12, shaft sleeve;13, bolt;14, second sealing ring;15, segmented compression ring;16, compression ring;17, first sealing ring;18, first wrapped gasket;19, thrust bearing;20, friction gasket;21, bottom cover, 22, second wrapped gasket. DETAILED DESCRIPTION

[0021] The utility model provides a high frequency sealed three eccentric butterfly valve as Figure 1 As shown in the drawing, it comprises a valve body 1, a valve rod 2, a valve plate 3 and a valve seat 4 are arranged in the valve body 1, the valve rod 2 is installed through the valve body 1, the valve plate 3 is installed on the valve rod 2 through the flat key 10 and the shaft pin 11, the valve rod 2 is as the center, the blowout prevention structure and the bottom wear-resistant structure are arranged at the top end and the bottom end of the valve rod 2 respectively, the inner wall annular convex of the valve body 1 installs the valve seat 4, is close to the valve seat 4, and the compression ring reverse structure is arranged around the valve plate 3.

[0022] See Figure 3, the reverse structure of the compression ring includes a segmented compression ring, the segmented compression ring 15 is embedded in the inner wall of the valve body 1, the annular protrusion of the inner wall of the valve body 1 is arranged near the valve rod 2, the annular side wall surface of the annular protrusion is pressed to fit the valve seat 4, the bolt 13 is pressed and fitted between the valve seat 4 and the segmented compression ring 15, one end of the bolt 13 is connected with the segmented compression ring 15 by threads, the other end of the bolt is pressed against the valve seat 4, the outside of the bolt 13 is sleeved with a spring, both ends of the spring are pressed against the segmented compression ring 15 and the nut of the bolt 13, the first sealing ring 17 is arranged at the joint of the valve seat 4 and the valve body 1, the valve plate 3 is in a stepped cylindrical shape in the inner cavity space of the valve seat 4, the outer end of the stepped cylindrical shape of the valve plate 3 is sleeved with the compression ring 16, the second sealing ring 14 is arranged in the space surrounded by the compression ring 16, the valve seat 4 and the valve plate 3, the first winding gasket 18 is arranged in the valve plate 3 at the joint of the sealing ring and the valve plate 3; the inner cavity of the valve seat 4 is a tapered cavity, which is arranged from inside to outside near the valve rod 2, the inner diameter of the tapered cavity changes from large to small, and the sealing ring and the compression ring 16 are matched with the inner wall of the tapered cavity of the valve seat 4;

[0023] See Figure 1 , the blowout prevention structure includes the valve body 1 and the valve rod 2, the space surrounded by the valve body 1 and the valve rod 2 is sequentially filled from inside to outside with the packing pad 8, the packing 7 and the packing gland 6, the packing gland 6 is pressed and fitted above the packing plate 5, and the packing plate 5 is sleeved on the valve rod 2 and connected with the valve body 1 by screws;

[0024] See Figure 1 , the bottom wear-resistant structure includes a thrust bearing 19, the thrust bearing 19 is installed at the bottom end of the valve rod 2 and connected with the valve rod 2 by screws, the bottom end of the thrust bearing 19 is sequentially pressed and fitted with a friction gasket 20 and a bottom cover 21, the bottom cover 21 is connected with the valve body 1 by screws, and the second winding gasket 22 is further arranged at the joint of the bottom cover 21 and the valve body 1;

[0025] The valve rod 2 is sleeved with a shaft sleeve 12 in contact with the valve body 1.

Claims

1. A high frequency sealing triple offset butterfly valve, comprising a valve body, a valve stem, a valve plate and a valve seat arranged inside the valve body, the valve stem is installed through the valve body, the valve plate is installed on the valve stem through a flat key and a shaft pin, characterized in that: The valve rod is taken as the center, and the blow-out prevention structure and the bottom wear-resistant structure are arranged at the top end and the bottom end of the valve rod respectively, the inner wall annular protrusion of the valve body is arranged with the valve seat, the pressure ring reverse mounting structure is arranged around the valve plate close to the valve seat.

2. A high frequency sealing triple offset butterfly valve according to claim 1, characterized in that: The pressure ring reverse mounting structure comprises a segmented pressure ring, the segmented pressure ring is embedded in the inner wall of the valve body, the annular protrusion of the valve body is arranged close to the valve rod, the valve seat is press-fitted on the annular side wall surface of the annular protrusion, the bolt is press-fitted between the valve seat and the segmented pressure ring, one end of the bolt is threadedly connected with the segmented pressure ring, the other end of the bolt presses the valve seat, the spring is sleeved on the outside of the bolt, both ends of the spring press the nut of the bolt and the segmented pressure ring, the first sealing ring is arranged at the joint of the valve seat and the valve body; the valve plate is in a stepped cylindrical shape in the inner cavity space portion of the valve seat, the pressure ring is sleeved on the outer end portion of the stepped cylindrical valve plate, the second sealing ring is arranged in the space surrounded by the pressure ring, the valve seat and the valve plate, the first winding gasket is arranged in the valve plate at the joint of the sealing ring and the valve plate, the inner cavity of the valve seat is a tapered cavity, the inner diameter of the tapered cavity changes from large to small from inside to outside close to the valve rod, and the sealing ring and the pressure ring are adapted to the inner wall of the tapered cavity of the valve seat.

3. A high frequency sealing triple offset butterfly valve according to claim 1 or 2, characterized in that: The blow-out prevention structure comprises a valve body and a valve rod, and the space surrounded by the valve body and the valve rod is sequentially filled with a packing pad, a packing and a packing gland from inside to outside, the packing gland is press-fitted with a packing plate above, the packing plate is sleeved on the valve rod and connected with the valve body through a screw.

4. A high frequency sealing triple offset butterfly valve according to claim 3, characterized in that: The bottom wear-resistant structure comprises a thrust bearing, the thrust bearing is arranged at the end portion of the bottom of the valve rod and connected with the valve rod through a screw, the bottom end portion of the thrust bearing is sequentially press-fitted with a friction gasket and a bottom cover, the bottom cover and the valve body are connected through a screw, and the second winding gasket is further arranged at the joint of the bottom cover and the valve body.

5. A high frequency sealing triple offset butterfly valve according to claim 4, characterized in that: The shaft sleeve is sleeved on the stem of the valve rod which contacts the valve body.

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