Novel double-valve-seat eccentric butterfly valve

Abstract

The utility model discloses a novel double-valve-seat eccentric butterfly valve which comprises a valve body and a valve rod located in the middle of the valve body and penetrating through the valve body, the top of the valve rod is connected with a driving device, a transmission support is fixedly connected between the driving device and the valve body, a butterfly plate is arranged at the position of an inner cavity of the valve body, and the butterfly plate is fixedly connected with the valve body. The butterfly plates comprise the first butterfly plate and the second butterfly plate which are installed on the two sides of the valve rod, and butterfly plate sealing rings are arranged on the contact faces of the butterfly plates and the valve body. A sealing ring pressing plate is arranged on the outer circle of one side of the butterfly plate, a valve seat is arranged at the end, close to the butterfly plate, of the valve body, the contact face of the valve seat and the butterfly plate is a sealing face, and the sealing face and a butterfly plate sealing ring form a sealing structure. The novel double-valve-seat eccentric butterfly valve is reliable in sealing performance, capable of achieving two-way sealing without leakage, convenient to operate, labor-saving and flexible.

Description

Technical Field

[0001] The utility model relates to the technical field of butterfly valves, in particular to a novel double-valve-seat eccentric butterfly valve. Background Art

[0002] The eccentric butterfly valve is a valve that changes the axial direction of the traditional butterfly valve. It is mainly used to transport high-viscosity, granular or corrosive media. The eccentric butterfly valve has the characteristics of compact structure, convenient operation, reliable performance, simple maintenance, etc. It is widely used in various industries such as hydraulics and electricity. The soft-sealed butterfly valve is a type of eccentric butterfly valve. The structural classification of eccentric butterfly valves includes single-eccentric butterfly valves, double-eccentric butterfly valves and triple-eccentric butterfly valves. Among them, the soft-sealed butterfly valve is suitable for use in water supply and drainage, interception media such as food, medicine, chemical industry, petroleum, textile, papermaking, etc. with a temperature of less than 120°C and a nominal pressure of less than 1.6MPa.

[0003] The valve seat of the soft-seal butterfly valve is made of non-metallic materials with certain strength, hardness and temperature resistance. It has strong sealing performance, but its life and temperature adaptability are relatively poor. The hard seal is made of metal, and its sealing performance is relatively poor, but it has a long service life and strong temperature adaptability. With the widespread use of butterfly valves, its features of easy installation, easy maintenance and simple structure are becoming more and more obvious. Electric soft-seal butterfly valves, pneumatic soft-seal butterfly valves, hard-seal butterfly valves, etc. are beginning to replace electric gate valves, stop valves, etc. in more and more occasions.

[0004] The sealing surfaces of the butterfly valve seat and the valve plate on the market currently adopt a conical structure, and the heat-resistant and corrosion-resistant alloy materials are welded on the oblique conical surface of the valve plate. Due to structural reasons, the traditional process structure cannot achieve two-way sealing. Currently, only the center-line soft-sealed butterfly valve in the market can achieve two-way sealing performance, but it is easy to close and has poor sealing performance, and the soft-sealed butterfly valve cannot meet the use of high-temperature steam. Utility Model Content

[0005] In view of the above-mentioned deficiencies of the current eccentric butterfly valve, the utility model provides a novel double-valve seat eccentric butterfly valve, which has reliable sealing performance, can achieve two-way sealing without leakage, is easy to operate, and is labor-saving and dexterous.

[0006] In order to achieve the above object, the embodiment of the utility model adopts the following technical solution:

[0007] A novel double-seat eccentric butterfly valve comprises a valve body and a valve stem located in the middle of the valve body and penetrating the valve body, the top of the valve stem is connected to a driving device, a transmission bracket is fixedly connected between the driving device and the valve body, the top of the valve stem penetrates into the interior of the driving device and cooperates with the transmission component inside the driving device; a disc plate is provided in the inner cavity of the valve body, the disc plate comprises a first disc plate and a second disc plate installed on both sides of the valve stem, and a disc plate sealing ring is provided at the contact surface of the disc plate with the valve body; a sealing ring pressure plate is provided on the outer circle of one side of the disc plate, and the end of the valve body close to the disc plate is a valve seat, the contact surface between the valve seat and the disc plate is a sealing surface, and the sealing surface and the disc plate sealing ring form a sealing structure.

[0008] According to one aspect of the utility model, the outer circumferential surface of the sealing ring pressing plate is a conical surface, and the sealing ring pressing plate is fixedly connected to the disc plate by a pressing plate fastening screw.

[0009] According to one aspect of the utility model, an end cover is provided at the inner bottom of the valve body, a winding gasket is provided between the end cover and the valve body, a valve stem fixing split ring is provided between the bottom of the valve stem and the end cover, and an end cover locking screw is provided between the end cover and the valve body.

[0010] According to one aspect of the utility model, the disc plate is connected to the valve stem via a disc plate positioning screw, and an intermediate transmission key is provided on the outer side of the valve stem located at the inner cavity of the valve body.

[0011] According to one aspect of the utility model, a packing gland is provided at the junction of the valve stem in the transmission bracket and the transmission bracket and the valve body, a packing pad is provided at the bottom of the packing gland, and packing is filled between the packing gland and the valve stem.

[0012] According to one aspect of the utility model, the outer side of the packing gland is fixedly connected to the valve body via a third bolt, a locking nut is provided on the top of the third bolt, and the third bolt is a stud bolt of unequal length.

[0013] According to one aspect of the utility model, the lower end of the driving device is fixedly connected to the transmission bracket via a first bolt; the lower end of the transmission bracket is fixedly connected to the valve body via a second bolt.

[0014] According to one aspect of the utility model, an oil-free bearing is provided between the contact surface of the valve body and the valve stem.

[0015] According to one aspect of the utility model, a nameplate is provided on the outer side of the transmission bracket, and the nameplate is fixedly connected to the transmission bracket by nameplate rivets.

[0016] Advantages of the implementation of the utility model: The utility model provides a new double-seat eccentric butterfly valve, a disc plate is provided in the inner cavity of the valve body, the disc plate includes a first disc plate and a second disc plate installed on both sides of the valve stem, and the disc plate is provided with a disc plate sealing ring at the contact surface with the valve body; a sealing ring pressure plate is provided on the outer circle of one side of the disc plate, and the valve body is a valve seat at one end close to the disc plate, and the contact surface between the valve seat and the disc plate is a sealing surface, and the sealing surface and the disc plate sealing ring form a sealing structure. The device is easy to open and has low manufacturing cost. It can be replaced and repaired after wear. At the same time, the material can be changed to meet the needs of different media and users. It has strong versatility. 90% of the parts can be interchangeable in the same specification and diameter of butterfly valves. It can be used in steam pipeline media, and the reverse sealing performance reaches 100%. When fully opened, the butterfly plate can completely detach from the valve seat sealing surface, and form a certain angle when closed, gradually enter the extrusion process, and have excellent closing sealing performance, effectively reducing wear and abrasion, and increasing service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0018] Figure 1 The utility model is a structural schematic diagram of a novel double-valve seat eccentric butterfly valve.

[0019] In the figure: 1. valve body; 2. valve stem; 3. disc plate; 31. first disc plate; 32. second disc plate; 4. disc plate positioning screw; 5. transmission key; 6. oil-free bearing; 7. packing gland; 8. second bolt; 9. nameplate rivet; 10. nameplate; 11. first bolt; 13. drive device; 14. transmission bracket; 15. locking nut; 16. third bolt; 17. packing; 18. packing pad; 19. disc plate sealing ring; 20. pressure plate fastening screw; 21. sealing ring pressure plate; 22. split ring; 23. spiral wound gasket; 24. end cover locking screw; 25. end cover. DETAILED DESCRIPTION

[0020] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside" and "outside" etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0021] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "plurality" means two or more.

[0022] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0023] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0024] like Figure 1 As shown, this embodiment provides a new type of double valve seat eccentric butterfly valve, including a valve body 1 and a valve stem 2 located in the middle of the valve body 1 and penetrating the valve body 1, the top of the valve stem 2 is connected with a driving device 13, and a transmission bracket 14 is fixedly connected between the driving device 13 and the valve body 1, specifically, the lower end of the driving device 13 is fixedly connected with the transmission bracket 14 through a first bolt 11, and the lower end of the transmission bracket 14 is fixedly connected with the valve body 1 through a second bolt 8. The top of the valve stem 2 penetrates into the interior of the driving device 13 and cooperates with the transmission assembly inside the driving device 13; wherein the driving device 13 includes a manual driving device 13 such as a handle, a hand wheel and / or an automatic driving device 13 such as an electric, electromagnetic, pneumatic, hydraulic, etc. The driving device 13 used in this embodiment is a hand wheel, which is connected to the valve stem 2 through a worm gear.

[0025] The inner cavity of the valve body 1 is provided with a disc plate 3, which includes a first disc plate 31 and a second disc plate 32 installed on both sides of the valve stem 2. The disc plate 3 is provided with a disc plate sealing ring 19 at the contact surface with the valve body 1; the disc plate sealing ring 19 can be a rubber sealing ring or a sealing ring made of other suitable elastic materials to meet the requirements of the butterfly valve for wear resistance and high temperature resistance. A sealing ring pressing plate 21 is provided on the outer circle of one side of the disc plate 3, and the end of the valve body 1 close to the disc plate 3 is a valve seat, and the contact surface between the valve seat and the disc plate 3 is a sealing surface, and the sealing surface and the disc plate sealing ring 19 form a sealing structure.

[0026] The outer circumferential surface of the sealing ring pressing plate 21 is a conical surface, and the sealing ring pressing plate 21 is fixedly connected to the disc plate 3 through the pressing plate fastening screws 20. In order to ensure that the sealing ring pressing plate 21 presses the disc plate sealing ring 19, the inner hole diameter of the sealing ring pressing plate 21 is smaller than the inner hole diameter of the disc plate sealing ring 19, and the outer circumferential surface of the sealing ring pressing plate 21 is a conical surface, which can also avoid interference when the disc plate 3 is rotated.

[0027] The first disc plate 31 and the second disc plate 32 are arranged in positive and negative symmetry. Since the present embodiment is provided with disc plates 3 on both sides of the valve stem 2, that is, there are two groups of components matching the disc plate 3, such as the disc plate sealing ring 19, the sealing ring pressure plate 21, and the valve seat, it is equivalent to the first disc plate 31 being a positive disc plate 3, and the second disc plate 32 being a reverse disc plate 3, wherein the sealing principle of the positive disc plate sealing ring 19 is: using the pipeline pressure to make the butterfly plate sealing ring fit the valve seat tightly under the action of pressure, and squeeze the sealing surface of the valve body 1 to achieve a sealing effect. The sealing principle of the reverse disc plate sealing ring 19 is: using the pipeline pressure, under the action of pressure, the rubber sealing ring fills the gap, deforms, and squeezes the sealing surface of the valve body 1 to achieve a two-way sealing effect. The valve structure of the present embodiment adopts the principle of a four-eccentric structure, and the valve becomes tighter and tighter, with zero leakage sealing performance.

[0028] In practical applications, the disc plate 3 is connected to the valve stem 2 through the disc plate positioning screw 4, and an intermediate transmission key 5 is provided on the outer side of the valve stem 2 located in the inner cavity of the valve body 1. The disc plate positioning screw 4 in this embodiment is a hexagon socket head cylindrical end set screw M8×15.

[0029] An end cover 25 is also provided at the bottom of the valve body 1, a winding gasket 23 is provided between the end cover 25 and the valve body 1, a valve stem 2 fixing split ring 22 is provided between the bottom of the valve stem 2 and the end cover 25, and an end cover locking screw 24 is provided between the end cover 25 and the valve body 1. The split ring 22 can firmly fix the valve stem 2 to prevent axial or radial distortion during operation, thereby ensuring the accuracy and reliability of valve operation.

[0030] A packing gland 7 is provided at the junction of the valve stem 2 in the transmission bracket 14 and the transmission bracket 14 and the valve body 1 . A packing pad 18 is provided at the bottom of the packing gland 7 . The packing 17 is filled between the packing gland 7 and the valve stem 2 .

[0031] The outer side of the packing gland 7 is fixedly connected to the valve body 1 by a third bolt 16, and a locking nut 15 is provided on the top of the third bolt 16. The third bolt 16 is an unequal length stud bolt, which can tightly connect the packing gland 7 and the upper surface of the valve body 1 at both ends, making the entire mechanical equipment more stable and reliable. Since the two ends of the stud bolt are of different lengths, it can adapt to connectors of different thicknesses and provide a more flexible connection method. The unequal length stud bolt model of this embodiment is an unequal length stud stud M12×50.

[0032] In practical applications, an oil-free bearing 6 is provided between the contact surfaces of the valve body 1 and the valve stem 2. The oil-free bearing 6 is a self-lubricating bearing that can work without oil or with little oil, and can effectively reduce the friction between the valve body 1 and the valve stem 2, reduce the operating torque, and make the valve easier to open and close. The oil-free bearing 6 has good wear resistance, which helps to extend the service life of the eccentric butterfly valve and reduce the frequency of maintenance and replacement.

[0033] In actual application, a nameplate 10 is provided on the outer side of the transmission bracket 14, and the nameplate 10 is fixedly connected to the transmission bracket 14 by nameplate rivets 9. Key information such as name, trademark, product model, etc. can be printed on the nameplate 10 according to actual conditions.

[0034] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model shall be based on the protection scope of the claims.

Claims

1. A novel double-seat eccentric butterfly valve, comprising a valve body (1) and a valve stem (2) located in the middle of the valve body (1) and penetrating the valve body (1), characterized in that: The top of the valve stem (2) is connected to a driving device (13), a transmission bracket (14) is fixedly connected between the driving device (13) and the valve body (1), and the top of the valve stem (2) penetrates into the interior of the driving device (13) and cooperates with the transmission component inside the driving device (13); a disc plate (3) is provided in the inner cavity of the valve body (1), the disc plate (3) comprises a first disc plate (31) and a second disc plate (32) installed on both sides of the valve stem (2), and a disc plate sealing ring (19) is provided at the contact surface of the disc plate (3) with the valve body (1); a sealing ring pressing plate (21) is provided on the outer circle of one side of the disc plate (3), and the valve body (1) is provided with a valve seat at one end close to the disc plate (3), and the contact surface between the valve seat and the disc plate (3) is a sealing surface, and the sealing surface and the disc plate sealing ring (19) form a sealing structure.

2. The novel double-seat eccentric butterfly valve according to claim 1 is characterized in that: The outer circumferential surface of the sealing ring pressing plate (21) is a conical surface, and the sealing ring pressing plate (21) is fixedly connected to the disc plate (3) via a pressing plate fastening screw (20).

3. The novel double-seat eccentric butterfly valve according to claim 1 is characterized in that: An end cover (25) is provided at the bottom of the valve body (1), a winding gasket (23) is provided between the end cover (25) and the valve body (1), a valve stem (2) fixing split ring (22) is provided between the bottom of the valve stem (2) and the end cover (25), and an end cover locking screw (24) is provided between the end cover (25) and the valve body (1).

4. The novel double-seat eccentric butterfly valve according to claim 1 is characterized in that: The disc plate (3) is connected to the valve stem (2) via a disc plate positioning screw (4), and an intermediate transmission key (5) is provided on the outer side of the valve stem (2) located in the inner cavity of the valve body (1).

5. The novel double-seat eccentric butterfly valve according to claim 1 is characterized in that: A packing gland (7) is provided at the junction of the valve stem (2) in the transmission bracket (14), the transmission bracket (14) and the valve body (1), a packing pad (18) is provided at the bottom of the packing gland (7), and packing (17) is filled between the packing gland (7) and the valve stem (2).

6. The novel double-seat eccentric butterfly valve according to claim 5 is characterized in that: The outer side of the packing gland (7) is fixedly connected to the valve body (1) via a third bolt (16), a locking nut (15) is provided on the top of the third bolt (16), and the third bolt (16) is a stud bolt of unequal length.

7. The novel double-seat eccentric butterfly valve according to claim 1 is characterized in that: The lower end of the driving device (13) is fixedly connected to the transmission bracket (14) via a first bolt (11); the lower end of the transmission bracket (14) is fixedly connected to the valve body (1) via a second bolt (8).

8. The novel double-seat eccentric butterfly valve according to claim 1 is characterized in that: An oil-free bearing (6) is provided between the contact surfaces of the valve body (1) and the valve stem (2).

9. The novel double-seat eccentric butterfly valve according to claim 1 is characterized in that: A nameplate (10) is provided on the outer side of the transmission bracket (14), and the nameplate (10) is fixedly connected to the transmission bracket (14) via nameplate rivets (9).

Images