Soft sealing butterfly valve

Abstract

The utility model relates to a soft sealing butterfly valve which comprises a valve body, a valve rod and a transmission device, the valve rod is arranged in the valve body in a rotating mode, and the transmission device is used for driving the valve rod to rotate. The valve rod is sleeved with a butterfly plate fixedly connected with the valve rod, the butterfly plate is arranged in the valve body and matched with the inner wall of the valve body, an annular groove is formed in the edge of the butterfly plate, and a composite sealing washer is installed in the annular groove. According to the soft sealing butterfly valve, displacement of the composite sealing washer in the closed state is avoided, the best sealing state of the composite sealing washer can be maintained, the operation torque is small, labor is saved, the sealing butterfly valve can be rapidly opened and closed, the sealing performance is improved, and the service life of the butterfly valve is prolonged. And high-efficiency closure, connection and flow regulation are realized.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing butterfly valves, in particular to a soft sealing butterfly valve. Background Art

[0002] Butterfly valve, also known as flap valve, is a control element used to regulate or cut off the medium in the fluid pipeline system. It has good wear resistance, corrosion resistance and safety. It is widely used in metallurgy, mining, electricity, petroleum, chemical industry, textile, environmental protection, urban construction, shipbuilding, food, medicine and national defense research. Butterfly valve refers to a valve whose closing part (valve disc or butterfly plate) is a disc, which rotates around the valve shaft to achieve opening and closing. Soft-sealed butterfly valves can be used to control the flow of various types of fluids such as air, water, steam, various corrosive media, mud, oil products, etc. The butterfly valve opening and closing part is a disc-shaped butterfly plate, which rotates around its own axis in the valve body to achieve the purpose of opening, closing or regulation.

[0003] However, the sealing gasket between the butterfly plate and the valve body of the existing butterfly valve is easily displaced during the use of the butterfly valve, resulting in leakage of the fluid in the pipe and poor sealing performance. It is urgent to improve the sealing performance of the butterfly valve. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a soft-sealed butterfly valve, which has the advantages of quick and convenient opening, small installation space, improved sealing, and efficient flow interception, connection and flow regulation.

[0005] The above utility model object of the utility model is achieved through the following technical solutions:

[0006] A soft-sealed butterfly valve comprises a valve body, a valve stem and a transmission device, wherein the valve stem is rotatably arranged in the valve body, and the transmission device is used to drive the valve stem to rotate;

[0007] The valve stem is externally sleeved with a butterfly plate fixedly connected thereto, and the butterfly plate is arranged in the valve body and matched with the inner wall thereof;

[0008] An annular groove is provided on the edge of the butterfly plate, and a composite sealing gasket is installed in the annular groove.

[0009] As a further technical solution of the utility model: the composite sealing gasket includes a corrosion-resistant layer and a hard layer and a soft layer arranged inside the corrosion-resistant layer.

[0010] As a further technical solution of the utility model: the corrosion-resistant layer is a polytetrafluoroethylene layer, the hard layer is a stainless steel layer, and the soft layer is a polymer material layer.

[0011] As a further technical solution of the utility model:

[0012] A first inclined surface is provided at the opening of the valve body, and the first inclined surface is inclined from an end close to the valve stem along the opening of the valve body toward the center direction of the butterfly plate;

[0013] The butterfly plate is provided with a second inclined surface adapted to the first inclined surface.

[0014] As a further technical solution of the utility model: the edge of the composite sealing gasket protrudes from the second inclined surface and abuts against the first inclined surface.

[0015] As a further technical solution of the utility model: an annular pressing plate is detachably fixed to the edge of one side of the butterfly plate, and the annular pressing plate is used to fix the composite sealing gasket on the butterfly plate.

[0016] As a further technical solution of the utility model: a plurality of limiting grooves are provided at an edge of one side of the butterfly plate, and a plurality of limiting blocks matching the limiting grooves are integrally formed and fixedly connected to a side of the annular pressure plate close to the butterfly plate.

[0017] As a further technical solution of the utility model: a bottom cover is provided at one end of the valve body away from the transmission device, and the bottom cover is detachably fixedly connected to the valve body.

[0018] As a further technical solution of the utility model: a layer of filler is wrapped around the upper end of the valve stem, and the filler is located between the valve stem and the valve body.

[0019] As a further technical solution of the utility model: the valve stem and the butterfly plate are detachably fixedly connected.

[0020] In summary, the present invention includes at least one of the following beneficial technical effects:

[0021] 1. A new type of composite sealing gasket is used, which includes a corrosion-resistant layer and a hard layer and a soft layer arranged inside the corrosion-resistant layer. It not only provides sufficient structural strength, but also has excellent sealing performance and temperature resistance.

[0022] 2. The interlocking structure of the limit groove and the limit block arranged on the butterfly plate and the pressure plate further limits the displacement of the sealing gasket in the closed state, which helps to maintain the best sealing state of the sealing gasket.

[0023] 3. The operating torque is small, labor-saving and light, and the sealed butterfly valve can be quickly opened and closed to achieve high-efficiency flow cutoff, connection and flow regulation.

[0024] 4. This soft-sealed butterfly valve consists of a valve body, a butterfly plate, a valve stem, a transmission device and other parts. It has a compact and simple structure and requires a small installation space. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0026] Figure 2 It is a side view of the utility model;

[0027] Figure 3 The utility model is a partially enlarged schematic diagram showing the composite sealing gasket.

[0028] Figure numerals: 1, bottom cover; 2, valve body; 21, first inclined surface; 22, second inclined surface; 3, sealing gasket; 31, hard layer; 32, soft layer; 33, corrosion-resistant layer; 4, butterfly plate; 41, limit groove; 42, ring groove; 5, annular pressure plate; 51, limit block; 6, valve stem; 7, packing; 8, transmission device. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application; obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application without making creative work are within the scope of protection of the present application.

[0030] In the description of the present application, it should be noted that the terms "upper", "lower", "inner", "outer", "top / bottom" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present application. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0031] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "provided with", "set / connected", "connected", etc. should be understood in a broad sense. For example, "connected" 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 this application can be understood according to specific circumstances.

[0032] Embodiment 1:

[0033] Reference Figure 1 and Figure 2, is a soft-sealed butterfly valve disclosed by the utility model, comprising a valve body 2, a valve stem 6 and a transmission device 8, the valve stem 6 is detachably fixedly connected to a butterfly plate 4, the valve stem 6 is rotatably arranged in the valve body 2, and the transmission device 8 is used to drive the valve stem 6 to rotate; a butterfly plate 4 fixedly connected to the valve stem 6 is sleeved on the outside of the valve stem 6, the butterfly plate 4 is arranged in the valve body 2 and matched with the inner wall thereof, an annular groove 42 is provided on the edge of the butterfly plate 4, and a composite sealing gasket 3 is installed in the annular groove 42.

[0034] By providing an annular groove 42 on the edge of the butterfly plate 4 and installing a composite sealing gasket 3 therein, a soft seal between the valve body 2 and the butterfly plate 4 is achieved. This design ensures that when the butterfly plate 4 is closed, the sealing gasket 3 can fit tightly against the inner wall of the valve body 2, effectively preventing the fluid medium from leaking from the butterfly plate 4, thereby significantly improving the sealing performance of the butterfly plate 4. The composite sealing gasket 3 is made of special materials and structural design, and can adapt to various working conditions and media types. Whether in high temperature, high pressure or corrosive media, it can maintain good sealing performance, expanding the application range of the soft-sealed butterfly valve. The soft sealing structure reduces the friction and wear between the butterfly plate 4 and the inner wall of the valve body 2, and reduces the maintenance cost of the valve. At the same time, the replaceability of the sealing gasket 3 also facilitates the repair and maintenance of the soft-sealed butterfly valve, further extending the service life of the soft-sealed butterfly valve.

[0035] The valve body 2 is provided with a first inclined surface 21 at the opening, and the first inclined surface 21 is inclined from the end close to the valve stem 6 along the opening of the valve body 2 toward the center of the butterfly plate 4; the butterfly plate 4 is provided with a second inclined surface 22 adapted to the first inclined surface 21, and the edge of the composite sealing gasket 3 protrudes from the second inclined surface 22 and abuts against the first inclined surface 21. When the butterfly plate 4 is closed, due to the pressure of the fluid, the composite sealing gasket 3 will be pressed more tightly against the first inclined surface 21, thereby further improving the sealing effect.

[0036] The soft-sealed butterfly valve adopts an eccentric structure. The butterfly plate 4 automatically centers with the valve body 2 during the closing process and fits closely with each other, ensuring the sealing performance and making the soft-sealed butterfly valve leak-free. The eccentric structure allows the butterfly plate 4 to quickly separate from the valve body 2 when opening; when closing, it only contacts the valve body 2 in the final sealing stage, reducing the wear of the sealing pair and extending the service life. When the sealing pair is worn, the butterfly plate 4 compensates for the wear with a small angle increment when closing, ensuring the seal and further extending the service life of the soft-sealed butterfly valve.

[0037] The valve body 2 is connected to the pipeline through two flanges. The transmission device 8 is mostly an electric device. The electric device and the worm gear drive the valve stem 6 to rotate 90°, which drives the butterfly plate 4 to rotate, thereby realizing the opening or closing of the soft-sealed butterfly valve. The flange material is consistent with the valve body 2 and is cast as one piece with the valve body 2.

[0038] The valve stem 6 is made of stainless steel 20Cr13 material. The shaft shoulder of the valve stem 6 adopts the local heating and upsetting process. The screwing length between the valve stem 6 and the valve plate nut is greater than or equal to 1.4 times the diameter of the valve stem 6. This not only improves the connection strength between them, ensures that the soft-sealed butterfly valve can be tightly sealed when closed to prevent medium leakage, but also reduces the wear of the valve stem 6 and the nut when the soft-sealed butterfly valve is opened, and prolongs the service life.

[0039] A bottom cover 1 is provided at one end of the valve body 2 away from the transmission device 8. The bottom cover 1 is detachably and fixedly connected to the valve body 2. The bottom cover 1 can cover and protect the internal components of the valve body 2, such as the valve stem 6, the butterfly plate 4, etc., and prevent them from being directly eroded by the external environment, such as dust, moisture, chemical substances, etc., thereby prolonging the service life of the soft-sealed butterfly valve.

[0040] The soft-sealed butterfly valve can adopt various actuators such as manual, pneumatic, and electric, with flexible and reliable operation. At the same time, it can be equipped with instruments for automatic control to adjust the flow rate of the soft-sealed butterfly valve at any time.

[0041] In addition, a handwheel is detachably and fixedly installed at the top of the soft-sealed butterfly valve. The handwheel is made of high-strength ductile iron, and the operation is designed to rotate in the horizontal direction. The operation direction is clockwise for closing and counterclockwise for opening.

[0042] Preferably, a locking device is installed on the soft-sealed butterfly valve, which can be switched with a key, avoiding unauthorized switching of the soft-sealed butterfly valve when not needed, thus causing misoperation.

[0043] A layer of packing 7 is wrapped around the upper end of the valve stem 2. The packing 7 is located between the valve stem 2 and the valve body 2. The sealing adopts multiple seals of the packing 7. The suitable packing 7 material can be selected according to the medium characteristics and working conditions, such as graphite, plastic, metal, and carbon fiber, etc. The design of the packing 7 seal makes the sealing surface have a certain self-adaptive ability, which can maintain stable sealing performance during the movement of the valve stem 6 and reduce the opening and closing torque. Due to the small opening and closing torque, the operation of the valve of the soft-sealed butterfly valve is more convenient, reducing the labor intensity of the operator.

[0044] Embodiment 2:

[0045] As Figure 3 , a soft-sealed butterfly valve further disclosed in the present utility model is different from Embodiment 1 in that the composite sealing gasket 3 includes a corrosion-resistant layer 33 and a hard layer 31 and a soft layer 32 provided inside the corrosion-resistant layer 33.

[0046] The composite sealing gasket 3 achieves sealing through its multi-layer structure. When the butterfly valve is closed, the sealing gasket 3 is pressed tightly between the valve body 2 and the butterfly plate 4, forming a tight sealing line. The corrosion-resistant layer 33 and the hard layer 31 ensure the structural strength and corrosion resistance of the sealing gasket 3, while the soft layer 32 provides good sealing performance and adaptability, capable of adapting to the sealing requirements under different working conditions.

[0047] Preferably, the corrosion-resistant layer 33 is a polytetrafluoroethylene layer, the hard layer (31) is a stainless steel layer, and the soft layer (32) can be either a rubber layer or a polymer material layer such as a polyimide layer. As the corrosion-resistant layer 33, the polytetrafluoroethylene layer has excellent corrosion resistance and chemical stability, capable of resisting the erosion of various chemical media. The stainless steel layer as the hard layer 31 ensures the structural strength and wear resistance of the sealing gasket. The polymer material layer such as the rubber layer or the polyimide layer as the soft layer 32 provides good sealing performance and elasticity, capable of adapting to the minor deformation and vibration during the rotation of the butterfly plate 4.

[0048] When the butterfly valve needs to be closed, it is driven by a worm and worm gear reduction or an electric motor, causing the butterfly plate 4 to rotate within a 90° range to the closed position. At this time, the composite sealing gasket 3 is pressed tightly between the valve body 2 and the butterfly plate 4, forming a tight sealing line to cut off the flow of the medium. When the butterfly valve needs to be opened, the butterfly plate 4 is rotated to the open position in the same way to allow the medium to pass through.

[0049] Embodiment Three:

[0050] As Figure 3 , another soft-sealing butterfly valve disclosed by the present utility model, different from Embodiment One, is that a ring-shaped pressing plate 5 is detachably fixed to the edge on one side of the butterfly plate 4, and the ring-shaped pressing plate 5 is used to fix the composite sealing gasket 3 on the butterfly plate 4. Through the action of the ring-shaped pressing plate 5, it prevents the composite sealing gasket 3 from shifting during long-term use, ensuring that the composite sealing gasket 3 is tightly fixed on the butterfly plate 4 to form an effective sealing interface. This fixing method ensures that the sealing gasket 3 can be closely attached to the valve body when the butterfly valve is closed, preventing fluid leakage.

[0051] A plurality of limiting grooves 41 are provided on the edge of one side of the butterfly plate 4, and a plurality of limiting blocks 51 matching the limiting grooves 41 are integrally formed and fixedly connected to one side of the annular pressure plate 5 close to the butterfly plate 4. Preferably, the number of the limiting blocks 51 is three, and these limiting blocks 51 match the limiting grooves 41 provided on the butterfly plate 4. When the annular pressure plate 5 is installed on the butterfly plate 4, the limiting blocks 51 will be accurately inserted into the limiting grooves 41, thereby achieving a close connection between the two. In addition, the fixing method between the annular pressure plate 5 and the butterfly plate 4 can adopt other snap-on connection methods, or can adopt bolt connection, so that the two can be easily disassembled and installed. The embodiments of this specific implementation method are all preferred embodiments of the utility model, and the protection scope of the utility model is not limited thereto. Therefore: all equivalent changes made according to the structure, shape, and principle of the utility model should be covered within the protection scope of the utility model.

Claims

1. A soft-sealed butterfly valve, comprising a valve body (2), a valve stem (6) and a transmission device (8), wherein the valve stem (6) is rotatably arranged in the valve body (2), and the transmission device (8) is used to drive the valve stem (6) to rotate; The valve stem (6) is sleeved with a butterfly plate (4) fixedly connected thereto on the outside, and the butterfly plate (4) is arranged in the valve body (2) and matches with the inner wall thereof; the characteristic is that: An annular groove (42) is formed on the edge of the butterfly plate (4), and a composite sealing gasket (3) is installed in the annular groove (42); The composite sealing gasket (3) comprises a corrosion-resistant layer (33) and a hard layer (31) and a soft layer (32) arranged inside the corrosion-resistant layer (33).

2. A soft-sealed butterfly valve according to claim 1, characterized in that: The corrosion-resistant layer (33) is a polytetrafluoroethylene layer, the hard layer (31) is a stainless steel layer, and the soft layer (32) is a polymer material layer.

3. A soft-sealed butterfly valve according to claim 1, characterized in that: A first inclined surface (21) is provided at the opening of the valve body (2), and the first inclined surface (21) is inclined from an end close to the valve stem (6) along the opening of the valve body (2) towards the center of the butterfly plate (4); The butterfly plate (4) is provided with a second inclined surface (22) adapted to the first inclined surface (21).

4. A soft-sealed butterfly valve according to claim 3, characterized in that: The edge of the composite sealing gasket (3) protrudes beyond the second inclined surface (22) and abuts against the first inclined surface (21).

5. A soft-sealed butterfly valve according to any one of claims 1 to 4, characterized in that: An annular pressing plate (5) is detachably fixed to the edge of one side of the butterfly plate (4), and the annular pressing plate (5) is used to fix the composite sealing gasket (3) on the butterfly plate (4).

6. A soft-sealed butterfly valve according to claim 5, characterized in that: A plurality of limiting grooves (41) are formed on the edge of one side of the butterfly plate (4), and a plurality of limiting blocks (51) matching the limiting grooves (41) are integrally formed and fixedly connected to a side of the annular pressure plate (5) close to the butterfly plate (4).

7. A soft-sealed butterfly valve according to claim 1, characterized in that: A bottom cover (1) is provided at one end of the valve body (2) away from the transmission device (8), and the bottom cover (1) is detachably fixedly connected to the valve body (2).

8. The soft-sealed butterfly valve according to claim 1, characterized in that: A layer of filler (7) is wrapped around the upper end of the valve stem (6), and the filler is located between the valve stem (6) and the valve body (2).

9. The soft-sealed butterfly valve according to claim 1, characterized in that: The valve stem (6) is detachably fixedly connected to the butterfly plate (4).

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