Maintenance-free butterfly valve

Abstract

The utility model discloses a kind of maintenance-free butterfly valves, including valve body assembly and butterfly piece assembly.Valve body assembly is constituted by butterfly valve body, end cap, hand wheel and valve stem, hand wheel is installed in end cap side wall, valve stem can be driven to rotate.Butterfly piece assembly includes butterfly piece, sealing washer, sealing box, micro air pump, air pipe and air nozzle etc., butterfly piece is fixed in the outer circle bottom section of valve stem, its outer circle is equipped with sealing groove for being clamped into sealing washer inner ring, there is cavity in sealing washer inside and can be deformed, rear side is equipped with air nozzle.Sealing box is fixed in the rear side of butterfly piece, inside has micro air pump, dry battery and controller, air pipe connects micro air pump with air nozzle.Butterfly piece is controlled to open and close by hand wheel, micro air pump exhausts air to make sealing washer expand and contract, realize sealing and opening, and sealing washer outer ring surface expands and is in close contact with the side wall of valve body inner cavity, sealing effect is good;Sealing washer can reduce friction between valve body after contraction, reduce the frequency of maintenance.

Description

Technical Field

[0001] This utility model relates to the field of triple eccentric butterfly valve technology, specifically to a maintenance-free butterfly valve. Background Technology

[0002] In the field of industrial pipeline fluid control, butterfly valves are widely used as commonly used shut-off and regulating devices in various media transportation scenarios. However, traditional butterfly valves have significant defects in sealing and maintenance.

[0003] Traditional butterfly valves typically employ a fixed sealing ring design, which maintains constant close contact with the valve body's inner wall. During the opening and closing of the butterfly valve, continuous relative friction occurs between the sealing ring and the valve body. Because the media in industrial pipelines are complex and may contain solid particles, corrosive substances, etc., these impurities accelerate the wear of the sealing ring. For example, in pipelines transporting slurry in mines, sand and gravel particles in the slurry act like sandpaper, constantly rubbing against the sealing ring surface, causing it to thin and break rapidly, ultimately leading to media leakage.

[0004] Meanwhile, frequent friction generates high temperatures on the surface of the sealing ring, accelerating its aging process. In high-temperature media transportation scenarios, such as steam pipelines in thermal power plants, traditional sealing rings are prone to hardening and cracking under the combined effects of high temperature and friction, severely affecting sealing performance. To maintain the normal sealing function of butterfly valves, regular replacement and maintenance of vulnerable parts such as sealing rings are required. This not only increases equipment downtime and affects production efficiency but also increases maintenance costs and labor intensity. For example, in some large chemical enterprises, butterfly valve maintenance requires professional personnel, and the cost of replacing sealing rings is high, placing a significant economic burden on the company. Therefore, developing a butterfly valve that can reduce friction between the sealing ring and the valve body and reduce the frequency of maintenance of vulnerable parts has become an urgent technical problem to be solved in the industrial field. Utility Model Content

[0005] The purpose of this utility model is to provide a technical solution for a maintenance-free butterfly valve to overcome the shortcomings mentioned in the background art. To address the drawbacks and defects described in the background art, this technical solution includes the following:

[0006] It includes a valve body assembly, and a disc assembly is movably disposed inside the valve body assembly;

[0007] The valve body assembly includes a butterfly valve body, an end cap fixed to the top of the butterfly valve body, and a valve stem installed at the bottom of the end cap and passing through the butterfly valve body. A handwheel for driving the valve stem to rotate is provided on the side wall of the end cap.

[0008] The butterfly assembly includes a butterfly plate fixed on the bottom section of the outer ring of the valve stem, a sealing gasket embedded on the outer ring of the butterfly plate, and a sealing box fixed on the rear side wall of the butterfly plate. A miniature air pump is fixedly connected to the inner cavity of the sealing box, and an air pipe is connected to the suction nozzle of the miniature air pump. An air nozzle that connects to the air pipe is fixedly connected to the rear side wall of the sealing gasket.

[0009] As a preferred embodiment of this utility model: a ring of inwardly recessed sealing groove is formed on the outer ring surface of the butterfly plate, which is used for the inner ring of the sealing gasket to be inserted into the interior of the butterfly plate.

[0010] As a preferred embodiment of this utility model, the sealing gasket has a cavity inside that allows it to deform outward or inward.

[0011] As a preferred embodiment of this utility model, a groove for fixing an air supply nozzle is provided on the rear end face of the sealing gasket.

[0012] As a preferred embodiment of this utility model: the interior of the sealed box has a cavity for a micro air pump to draw in and expel air.

[0013] As a preferred embodiment of this utility model: a dry cell battery for powering the micro air pump is fixedly connected in the inner cavity of the sealed box, and a controller for controlling the micro air pump to draw in or expel air is fixed inside the sealed box.

[0014] As a preferred embodiment of this utility model: the rear side of the disc is provided with a through hole for inserting an air supply pipe and connecting it to the air nozzle, wherein a dynamic sealing ring is fixed inside the through hole.

[0015] As a preferred embodiment of this utility model, the outer ring surface of the sealing gasket is in close contact with the inner cavity sidewall of the disc after the sealing gasket expands.

[0016] The technical effects and advantages provided by this utility model in the above technical solution are as follows:

[0017] This maintenance-free butterfly valve technology offers several advantages. The outer ring of the butterfly disc features a sealing groove, facilitating the positioning and installation of the sealing gasket, thus improving assembly efficiency and stability. The internal chamber of the sealing gasket, used in conjunction with a miniature air pump for air intake and exhaust, allows for expansion and contraction as needed, achieving excellent sealing and opening. Furthermore, the expanded outer ring of the sealing gasket makes tight contact with the inner wall of the valve body, ensuring a superior seal. Constriction of the sealing gasket reduces friction with the valve body, decreasing maintenance frequency. The sealed housing integrates a miniature air pump, a dry cell battery, and a controller, featuring a compact structure. It powers and controls the air pump, while the dry cell battery provides a stable power source, reducing reliance on external power sources, lowering maintenance costs, and enhancing the reliability and practicality of the butterfly valve. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0019] Figure 1 This is a schematic diagram of the overall structure of a butterfly valve;

[0020] Figure 2 This is a schematic diagram of a butterfly valve after disassembly.

[0021] Figure 3 This is a schematic diagram showing the dissection of the butterfly blade;

[0022] Figure 4 This is a schematic diagram of the self-expanding sealing gasket inside the butterfly plate.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Valve body assembly; 11. Butterfly valve body; 12. End cap; 13. Handwheel; 14. Valve stem; 2. Butterfly plate assembly; 21. Butterfly plate; 22. Sealing groove; 23. Sealing gasket; 24. Chamber; 25. Air nozzle; 26. Air pipe; 27. Sealing housing; 28. Miniature air pump. Detailed Implementation

[0025] To provide a clearer explanation and illustration of the technical solution and implementation of this utility model, several preferred specific embodiments for implementing the technical solution of this utility model are described below. The following description is merely exemplary and not intended to limit the scope, application, or use of this disclosure. It should be understood that in all these drawings, the same or similar reference numerals indicate the same or similar parts and features. The various drawings only schematically illustrate the concept and principles of the embodiments of this disclosure and do not necessarily show the specific dimensions and proportions of the various embodiments of this disclosure. Specific parts in certain drawings may be exaggerated to illustrate relevant details or structures of the embodiments of this disclosure. The technical solution of this utility model will be clearly and completely described below in conjunction with the embodiments of this utility model. Obviously, the described embodiments are only a part of the embodiments of this utility model.

[0026] Example 1: A maintenance-free butterfly valve includes a valve body assembly 1, with a butterfly disc assembly 2 movably disposed inside the valve body assembly 1. In the valve body assembly 1, the butterfly valve body 11 is placed horizontally, and an end cap 12 is fixed to the top of the butterfly valve body 11 by bolts. A valve stem 14 is vertically installed at the bottom of the end cap 12 and passes through the butterfly valve body 11. A handwheel 13 is installed on the side wall of the end cap 12, and rotating the handwheel 13 drives the valve stem 14 to rotate. In the butterfly disc assembly 2, a butterfly disc 21 is fixed to the bottom section of the outer ring of the valve stem 14. An inwardly recessed sealing groove 22 is formed on the outer ring surface of the butterfly disc 21, and the inner ring of the sealing gasket 23 is engaged with the sealing groove 22 to achieve initial positioning. A chamber 24 is provided inside the sealing gasket 23 to enable it to deform. A groove is provided on the rear end face of the sealing gasket 23, and an air nozzle 25 is embedded and fixed in the groove. The sealed housing 27 is fixed to the rear side wall of the butterfly valve 21 and has an internal cavity. A miniature air pump 28 is fixed inside the cavity. A dry cell battery powers the miniature air pump 28, and a controller controls the pump to draw in or expel air. One end of the air pipe 26 is connected to the suction nozzle of the miniature air pump 28, and the other end passes through a through-hole on the rear side of the butterfly valve 21 (a dynamic sealing ring is fixed inside the through-hole) and connects to the air nozzle 25. When sealing is required, the controller controls the miniature air pump 28 to draw in air. The gas enters the chamber 24 of the sealing gasket 23 through the air pipe 26 and the air nozzle 25. The sealing gasket 23 expands, and its outer ring surface makes tight contact with the inner side wall of the butterfly valve body 11, achieving a seal.

[0027] Example 2: The structure of valve body assembly 1 is the same as in Example 1. The butterfly valve body 11 is placed horizontally, the end cap 12 is fixed to the top, the valve stem 14 is installed through, and the handwheel 13 drives the valve stem 14 on the side wall. In the butterfly plate assembly 2, the butterfly plate 21 is installed on the bottom section of the outer ring of the valve stem 14, the sealing groove 22 is opened on the outer ring surface of the butterfly plate 21, and the inner ring of the sealing gasket 23 is inserted into the sealing groove 22. The internal cavity 24 of the sealing gasket 23 is designed to be deformable, and the air nozzle 25 is embedded in the groove on the rear end face of the sealing gasket 23. The sealing box 27 is fixed to the rear side of the butterfly plate 21, and a miniature air pump 28 is installed in the internal cavity. The miniature air pump 28 is powered by a dry cell battery, and the controller controls its operation. The air pipe 26 connects the suction nozzle of the miniature air pump 28 and the air nozzle 25, and passes through the through hole on the rear side of the butterfly plate 21 to drive the sealing ring. The difference lies in the fact that a special texture is provided on the surface of the sealing gasket 23 that contacts the inner wall of the butterfly valve body 11. When the sealing gasket 23 expands, the special texture can increase the friction with the inner wall of the butterfly valve body 11, further improving the sealing effect.

[0028] Example 3: In valve body assembly 1, the butterfly valve body 11 is horizontally arranged, the end cap 12 is fixed to the top, the valve stem 14 is installed through, and the handwheel 13 drives the valve stem 14 to rotate on the side wall. In butterfly plate assembly 2, the butterfly plate 21 is fixed to the bottom section of the outer ring of the valve stem 14, the sealing groove 22 is opened on the outer ring of the butterfly plate 21, and the inner ring of the sealing gasket 23 is inserted into the sealing groove 22. The sealing gasket 23 has a chamber 24 inside, and the air nozzle 25 is embedded in the groove on the rear end face of the sealing gasket 23. The sealing housing 27 is fixed to the rear side of the butterfly plate 21, and a miniature air pump 28 is installed in the internal cavity. It is powered by a dry cell battery, and the controller controls the miniature air pump 28. The air pipe 26 connects the miniature air pump 28 and the air nozzle 25, and passes through the through hole on the rear side of the butterfly plate 21 to drive the sealing ring. In addition, a waterproof coating is provided on the outer surface of the sealing housing 27 to prevent water from entering the sealing housing 27 in a humid environment and damaging the miniature air pump 28, dry cell battery, controller and other components, ensuring that the butterfly valve works normally in various environments. Meanwhile, an elastic support structure is provided in the chamber 24 of the sealing gasket 23. When the micro air pump 28 stops working, the elastic support structure can restore the sealing gasket 23 to a certain shape, which is convenient for the next sealing operation.

[0029] Based on the above-described preferred technical solution, the workflow of this technical solution is explained as follows:

[0030] In the initial state, the butterfly valve body 11 in valve body assembly 1 is horizontally placed, the end cap 12 is firmly fixed to the top of the butterfly valve body 11 with bolts, the valve stem 14 is vertically installed at the bottom of the end cap 12 and passes through the butterfly valve body 11, and the handwheel 13 is installed on the side wall of the end cap 12. At this time, the handwheel 13 is not operated, the valve stem 14 is stationary, and the butterfly disc 21 in butterfly disc assembly 2 is fixed to the bottom section of the outer ring of the valve stem 14 and is also stationary. There is no pressure change in the internal chamber 24 of the sealing gasket 23, and there is a gap between the outer ring surface of the sealing gasket 23 and the inner wall of the butterfly valve body 11. The butterfly valve is in a non-sealed, flowable state. When it is necessary to close the butterfly valve to achieve a seal, the handwheel 13 is rotated. The handwheel 13 drives the valve stem 14 to rotate, and the rotation of the valve stem 14 causes the butterfly disc 21 fixed to the bottom section of its outer ring to rotate accordingly. When the disc 21 rotates to the predetermined closed position, the controller inside the sealing housing 27 is activated. The controller controls the micro air pump 28 to start working. The micro air pump 28 draws air through the air pipe 26 connected to its suction nozzle. The other end of the air pipe 26 is connected to the air nozzle 25 embedded in the groove on the rear end face of the sealing gasket 23. The gas enters the air pipe 26 through the air nozzle 25 and is drawn away by the micro air pump 28, which creates a negative pressure in the chamber 24 inside the sealing gasket 23. External gas enters the chamber 24 and causes the sealing gasket 23 to expand. During the expansion process, the outer ring surface of the sealing gasket 23 gradually comes into close contact with the inner wall of the butterfly valve body 11, thereby achieving a sealing effect. During the gas transmission through the air pipe 26, the air pipe 26 passes through the through hole on the rear side of the disc 21. The dynamic sealing ring fixed in the through hole can prevent gas leakage.

[0031] When the butterfly valve needs to be opened, the controller controls the micro air pump 28 to work in reverse, drawing out and discharging the gas in the internal chamber 24 of the sealing gasket 23 through the air pipe 26 and the air nozzle 25. The internal air pressure of the sealing gasket 23 decreases, and the sealing gasket 23 returns to its original shape. The tight contact between its outer ring surface and the inner wall of the butterfly valve body 11 is released. The handwheel 13 is then rotated again, causing the valve stem 14 to rotate. The valve stem 14 then rotates the butterfly disc 21 to the open position, opening the butterfly valve and allowing fluid to flow through. Throughout the entire operation, the dry electrical components inside the sealing housing 27 remain closed. The battery continuously supplies power to the micro air pump 28, ensuring that the micro air pump 28 has sufficient power support under different working conditions. At the same time, the cavity inside the sealed housing 27 provides space for the micro air pump 28 to draw in and expel air, and can also provide a certain degree of protection for components such as the micro air pump 28, dry battery, and controller. In addition, the inwardly recessed sealing groove 22 on the outer surface of the disc 21 allows the inner ring of the sealing gasket 23 to be inserted into the interior of the disc 21 during installation, which plays a preliminary positioning role for the sealing gasket 23, facilitating the installation and stable operation of the sealing gasket 23.

[0032] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A maintenance-free butterfly valve, comprising a valve body assembly (1), characterized in that: The valve body assembly (1) is internally equipped with a butterfly plate assembly (2); The valve body assembly (1) includes a butterfly valve body (11), an end cap (12) fixed to the top of the butterfly valve body (11), and a valve stem (14) installed at the bottom of the end cap (12) and passing through the butterfly valve body (11). A handwheel (13) for driving the valve stem (14) to rotate is provided on the side wall of the end cap (12). The butterfly assembly (2) includes a butterfly (21) fixed on the bottom section of the outer ring of the valve stem (14), a sealing gasket (23) embedded on the outer ring of the butterfly (21), and a sealing box (27) fixed on the rear side wall of the butterfly (21). A micro air pump (28) is fixedly connected in the inner cavity of the sealing box (27), and the suction nozzle of the micro air pump (28) is connected to an air tube (26). An air nozzle (25) that connects to the air tube (26) is fixedly connected to the rear side wall of the sealing gasket (23).

2. The maintenance-free butterfly valve according to claim 1, characterized in that: A recessed sealing groove (22) is formed on the outer surface of the disc (21) for the inner ring of the sealing gasket (23) to be inserted into the interior of the disc (21).

3. The maintenance-free butterfly valve according to claim 1, characterized in that: The sealing gasket (23) has a cavity (24) inside which it can deform outward or inward.

4. The maintenance-free butterfly valve according to claim 1, characterized in that: The rear end face of the sealing gasket (23) is provided with a groove for the air supply nozzle (25) to be embedded and fixed.

5. A maintenance-free butterfly valve according to claim 1, characterized in that: The sealed housing (27) has a cavity inside for the micro air pump (28) to draw in and expel air.

6. A maintenance-free butterfly valve according to claim 1, characterized in that: A dry cell battery for powering the micro air pump (28) is fixedly connected inside the sealed housing (27), and a controller for controlling the micro air pump (28) to draw or vent air is fixed inside the sealed housing (27).

7. The maintenance-free butterfly valve according to claim 1, characterized in that: The rear side of the disc (21) is provided with a through hole through which an air supply pipe (26) is inserted and connected to the air nozzle (25), wherein a dynamic sealing ring is fixed inside the through hole.

8. The maintenance-free butterfly valve according to claim 1, characterized in that: The outer ring surface of the sealing gasket (23) comes into close contact with the inner cavity sidewall of the disc (21) after the sealing gasket (23) expands.

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