A high-clean metal hard-sealed butterfly valve

Abstract

The present invention relates to the technical field of butterfly valves, and in particular to a high-cleanliness metal hard-sealed butterfly valve, comprising: a valve body, a butterfly plate and a valve stem, wherein the butterfly plate is rotatably connected to the interior of the valve body through the valve stem; a lower flange is provided at the bottom of the valve body, and the lower flange is fixedly connected to the valve body through fixing bolts, a connecting sleeve is integrally connected to the butterfly plate, one end of the valve stem is provided with a split ring, and the valve stem and the lower flange are rotatably connected to each other through the split ring, and the other end of the valve stem passes through the connecting sleeve and is driven to be connected to an electric actuator. The contact surface between the valve body and the sealing ring in the present invention is an oblique cone surface, and the contact angle between the sealing ring and the valve seat can produce a slight "wedge effect", causing the sealing ring to move softly and expand radially, so that the load loaded on the valve body is uniform, thereby achieving the tightest shutoff with the minimum torque, and ensuring that the valve body achieves a zero-leakage sealing effect.

Description

Technical Field

[0001] The present invention relates to the technical field of butterfly valves, and in particular to a high-cleanliness metal hard-sealed butterfly valve. Background Art

[0002] At present, the butterfly valve, also known as the flap valve, is a simple regulating valve that can be used for the on-off control of low-pressure pipeline media. The butterfly valve uses the closing part (valve disc or butterfly plate) as a disc and realizes opening and closing by rotating around the valve axis.

[0003] As we all know, butterfly valves are mostly in dusty and high-temperature working environments. Small debris such as dust or impurities generated during the relative operation of the butterfly valve can easily enter the gap between the valve stem and the valve body or enter the cavity and come into direct contact with the medium. Pollutants can easily enter the valve body channel and pollute the high-cleanliness environment.

[0004] Therefore, a high-clean metal hard-sealed butterfly valve is needed to solve the above problems. Summary of the Invention

[0005] The purpose of the present invention is to provide a high-cleanliness metal hard-sealed butterfly valve. The contact surface between the valve body and the sealing ring in the present invention is an oblique cone surface, and the contact angle between the sealing ring and the valve seat can produce a slight "wedge effect", which makes the sealing ring move softly and expand radially, so that the load loaded on the valve body is uniform, thereby achieving the tightest shutoff with the minimum torque. The elasticity generated by the torque can make the valve tightly shut off, regardless of the flow direction or pressure of the medium, and can ensure that the valve body achieves a zero-leakage sealing effect.

[0006] The technical solution adopted by the present invention to solve the above technical problems is: a high-clean metal hard-sealed butterfly valve, comprising: a valve body, a butterfly plate and a valve stem, wherein the butterfly plate is rotatably connected to the interior of the valve body through the valve stem;

[0007] A lower flange is provided at the bottom of the valve body, and the lower flange is fixedly connected to the valve body by fixing bolts. A connecting sleeve is integrally connected to the butterfly plate. One end of the valve stem is provided with a split ring, and the valve stem and the lower flange are rotatably connected to each other through the split ring. The other end of the valve stem passes through the connecting sleeve and is driven and connected to the electric actuator.

[0008] The valve body is provided with a pressure ring, which is provided with a plurality of screw holes, and pressure ring screws are provided in the screw holes. The pressure ring is fixedly connected to the valve body through the plurality of pressure ring screws, and a sealing ring is installed between the pressure ring and the valve body. The contact surface between the valve body and the sealing ring is an oblique cone surface;

[0009] The valve stem outer sleeve is provided with a first shaft sleeve and a thrust shaft sleeve, a dustproof pad A is provided between the first shaft sleeve and the thrust shaft sleeve, the dustproof pad A and the first shaft sleeve are fixedly connected to each other, a plurality of dust storage grooves A are provided on the first shaft sleeve and the thrust shaft sleeve, a dustproof pad B is provided between the thrust shaft sleeve and the butterfly plate, the dustproof pad B and the thrust shaft sleeve are fixedly connected to each other.

[0010] Furthermore, a sealing surface is connected to the periphery of the sealing ring, and the sealing surface and the sealing ring are integrally welded, and the sealing surface is made of STL6 hard alloy.

[0011] Furthermore, a winding gasket is provided between the sealing ring and the valve body, and the winding gasket and the sealing ring are fixedly connected to each other.

[0012] Furthermore, a dust storage groove B is provided on the sealing ring, and the dust storage groove B is arranged on one side of the spiral wound gasket. The dust storage groove B is used to store excess sealing material squeezed out after the spiral wound gasket is deformed.

[0013] Furthermore, a packing assembly is provided between the valve stem and the valve body, and the packing assembly includes a pressure plate, a pressure sleeve and a packing. The pressure sleeve is provided on the valve stem, the pressure plate is fixedly connected to the upper end of the pressure sleeve, and a sleeve support ring for supporting the first sleeve is provided at the lower end of the pressure sleeve. The packing is provided between the pressure sleeve and the sleeve support ring.

[0014] Furthermore, the valve stem and the electric actuator are connected to each other via a key A, and the valve stem and the connecting sleeve of the butterfly plate are connected to each other via a key B.

[0015] The advantages of the present invention are: the present invention provides a high-cleanliness metal hard-sealed butterfly valve, the present invention has the following advantages:

[0016] 1. The contact surface between the valve body and the sealing ring in the present invention is an oblique cone surface. The contact angle between the sealing ring and the valve seat can produce a slight "wedge effect", which makes the sealing ring move softly and expand radially. Due to the uniform contact between the valve body and the sealing ring and the flexibility of the sealing ring, the load on the valve body is uniform, so that the tightest shutoff is achieved with the minimum torque. The elasticity generated by the torque can make the valve tightly shut off, regardless of the flow direction or pressure of the medium, and can ensure that the valve body achieves a zero-leakage sealing effect.

[0017] 2. The present invention provides a first shaft sleeve and a thrust shaft sleeve on the valve stem outer sleeve, a dustproof pad A is provided between the first shaft sleeve and the thrust shaft sleeve, and a dustproof pad B is provided between the thrust shaft sleeve and the butterfly plate. The present invention can isolate the sliding friction area where dust exists from the flow channel through the dustproof pad A and the dustproof pad B, thereby preventing dust generated at the valve stem from entering the flow channel area and polluting the high-cleanliness area.

[0018] 3. The present invention has multiple dust storage grooves A on the first sleeve and the thrust sleeve, which can store dust generated by the rotation of the valve stem. The present invention has a dust storage groove B on the sealing ring, which can store excess sealing material squeezed out after the spiral wound gasket is deformed. The butterfly plate in the present invention adopts an integrated structure, which can greatly reduce the dust generated by the pressure control part when the medium passes through the flow channel. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the specific embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0020] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0021] Figure 2 A schematic diagram of the three-dimensional structure of the present invention from another angle;

[0022] Figure 3 It is a schematic diagram of a three-dimensional cross-sectional structure of the present invention;

[0023] Figure 4 for Figure 3 Schematic diagram of the enlarged structure at A in the middle;

[0024] Figure 5 for Figure 3 Schematic diagram of the enlarged structure at B in the middle;

[0025] Figure 6 It is a schematic diagram of the assembly structure of the present invention;

[0026] Figure 7 for Figure 6 A schematic diagram of the right side cross-sectional structure of FIG.

[0027] Figure 8 for Figure 7 Schematic diagram of the enlarged structure at C in the middle;

[0028] Figure 9 for Figure 7 Schematic diagram of the enlarged structure at D in the middle;

[0029] Figure 10 for Figure 7 Schematic diagram of the enlarged structure at E in the middle;

[0030] Including: 1. Valve body; 2. Butterfly plate; 201. Sealing surface;

[0031] 3. Pressing ring; 4. Screw hole; 5. Pressing ring screw;

[0032] 6. Valve stem; 7. Key A; 8. Lower flange;

[0033] 9. Fixing bolt; 10. Connecting sleeve; 11. Key B;

[0034] 12. Dustproof pad A; 13. Dustproof pad B; 14. Sealing ring;

[0035] 15. Thrust sleeve; 16. Shaft sleeve; 17. Dust storage tank A;

[0036] 18. Electric actuator; 19. Split ring; 20. Dust storage tank B;

[0037] 21. Wound gasket; 22. Pressing plate; 23. Pressing sleeve;

[0038] 24. Packing; 25. Shaft sleeve support ring. DETAILED DESCRIPTION

[0039] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0040] In the description of the present invention, it should be noted that, unless otherwise expressly specified and limited, the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside" and the like indicate orientations or positional relationships 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 cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. 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 an indirect connection through an intermediate medium, or it can be a communication between the internal parts of two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. Example

[0041] Figure 1 is a schematic diagram of the three-dimensional structure of the present invention, Figure 2 This is a schematic diagram of the three-dimensional structure of the present invention from another angle. Figure 3This is a schematic diagram of a three-dimensional cross-sectional structure of the present invention. Figure 4 for Figure 3 The enlarged structural diagram at A in the middle is shown. Figure 5 for Figure 3 The enlarged structural diagram at B in the middle is shown. Figure 6 This is a schematic diagram of the assembly structure of the present invention. Figure 7 for Figure 6 The right side cross-sectional structural diagram, Figure 8 for Figure 7 The enlarged structural diagram at C in the middle is shown. Figure 9 for Figure 7 The enlarged structural diagram at D in the middle is shown in the figure. Figure 10 for Figure 7 The enlarged structural diagram at E is as follows: Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9 and Figure 10 The high-cleanliness metal hard-sealed butterfly valve shown includes: a valve body 1, a butterfly plate 2 and a valve stem 6, the butterfly plate 2 is rotatably connected to the inside of the valve body 1 through the valve stem 6, and a lower flange 8 is provided at the bottom of the valve body 1 of the present invention, and the lower flange 8 is fixedly connected to the valve body 1 through fixing bolts 9, and a connecting sleeve 10 is integrally connected to the butterfly plate 2, and one end of the valve stem 6 is provided with a split ring 19, and the other end of the valve stem 6 passes through the connecting sleeve 10 and is driven and connected to the electric actuator 18. The valve stem 6 and the lower flange 8 in the present invention are rotatably connected to each other through the split ring 19, even in extreme cases such as abnormal pressure increase in the valve cavity, failure of the packing 24 pressure plate 22, and falling off of the connecting key between the butterfly plate 2 and the valve stem 6, the split ring 19 can effectively ensure that the valve stem 6 will not be blown out by the medium.

[0042] The present invention is provided with a pressure ring 3 on the valve body 1, a plurality of screw holes 4 are opened on the pressure ring 3, and a pressure ring screw 5 is provided in the screw hole 4. The pressure ring 3 is fixedly connected to the valve body 1 through the plurality of pressure ring screws 5, and a sealing ring 14 is installed between the pressure ring 3 and the valve body 1. The sealing ring 14 in the present invention adopts a pure metal sealing ring 14, which is resistant to erosion and high temperature. It has excellent sealing performance under low and high temperature conditions, is corrosion-resistant, and has a long service life. The present invention can achieve true zero leakage through the pure metal sealing ring 14, specifically by The elasticity of the sealing ring 14 is achieved by its radial compression and soft movement. The contact surface between the valve body 1 and the sealing ring 14 in the present invention is an oblique cone surface. The contact angle between the sealing ring 14 and the valve body 1 can produce a slight "wedge effect", causing the sealing ring 14 to move softly and expand radially. Due to the uniform contact between the valve body 1 and the sealing ring 14 and the flexibility of the sealing ring 14, the load loaded on the valve body 1 is uniform, thereby achieving the tightest shutoff with the minimum torque. The elasticity generated by the torque enables the valve to be tightly shutoff, regardless of the flow direction or pressure of the medium.

[0043] In the present invention, a first shaft sleeve 16 and a thrust shaft sleeve 15 are provided on the outer sleeve of the valve stem 6, a dustproof pad A12 is provided between the first shaft sleeve 16 and the thrust shaft sleeve 15, the dustproof pad A12 and the first shaft sleeve 16 are fixedly connected to each other, a plurality of dust storage grooves A17 are provided on the first shaft sleeve 16 and the thrust shaft sleeve 15, which can store the dust generated by the rotation of the valve stem 6, a dustproof pad B13 is provided between the thrust shaft sleeve 15 and the butterfly plate 2, the dustproof pad B13 and the thrust shaft sleeve 15 are fixedly connected to each other, the present invention can isolate the sliding friction area where dust exists from the flow channel through the dustproof pad A12 and the dustproof pad B13, thereby preventing the dust generated at the valve stem 6 from entering the flow channel area and polluting the high-cleanliness area.

[0044] In the present invention, a sealing surface 201 is connected to the periphery of the sealing ring 14, and the sealing surface 201 and the sealing ring 14 are integrally welded. The sealing surface 201 is made of STL6 hard alloy, and the sealing surface 201 is wear-resistant and has a long service life. A winding gasket 21 is provided between the sealing ring 14 and the valve body 1, and the winding gasket 21 and the sealing ring 14 are fixedly connected to each other. In the present invention, a dust storage groove B20 is opened on the sealing ring 14, and the dust storage groove B20 is provided on one side of the winding gasket 21. The dust storage groove B20 is used to store excess sealing material squeezed out after the winding gasket 21 is deformed.

[0045] A packing assembly is provided between the valve stem 6 and the valve body 1 in the present invention, and the packing assembly includes a pressure plate 22, a pressure sleeve 23 and a packing 24. The pressure sleeve 23 is sleeved on the valve stem 6, and the pressure plate 22 is fixedly connected to the upper end of the pressure sleeve 23. A sleeve support ring 25 for supporting the first sleeve 16 is provided at the lower end of the pressure sleeve 23. The packing 24 is arranged between the pressure sleeve 23 and the sleeve support ring 25. The packing assembly in the present invention adopts a split design, and the mating surface is processed by a spherical surface using a CNC machine tool. Automatic centering can be achieved during compression to ensure 360° uniform compression of the packing 24.

[0046] The valve stem 6 and the electric actuator 18 in the present invention are connected to each other through a key A7, and the valve stem 6 and the connecting sleeve 10 of the butterfly plate 2 are connected to each other through a key B11. The valve stem 6 can be rotated under the drive of the externally arranged electric actuator 18, thereby realizing the rotation of the butterfly plate 2 through the valve stem 6. The present invention has a simple structure and is mainly composed of a few parts such as the valve body 1, the butterfly plate 2, and the valve stem 6, which saves material consumption; it has a small size, light weight, small installation size, small driving torque, simple and quick operation, and only needs to rotate 90° to achieve rapid opening and closing. The present invention adopts a triple eccentric structure, which adds a third eccentricity on the basis of the double eccentricity, that is, the angle between the center line of the valve seat cone angle and the center line of the pipeline, so that the butterfly plate 2 and the sealing ring 14 can be completely separated during the entire switching process of the valve. This structure not only utilizes the cam effect, but also completely eliminates friction and removes wear.

[0047] Working principle: The valve stem 6 in the present invention can be rotated under the drive of the external electric actuator 18, thereby driving the rotation of the butterfly plate 2 through the valve stem 6, changing the channel area of ​​the fluid passing through the valve, and achieving the purpose of flow control. Its nominal diameter is DN600, nominal pressure: PN2.5, valve opening torque is 417N.M, valve closing torque is 2023N.M, the inner surface of the valve body, valve stem, and butterfly plate are all electrochemically polished, and the surface finish is not less than Rmax0.8μm, and Ra is less than 0.2μm; the butterfly valve sealing pair disclosed in the present invention adopts a triple eccentric structure, which adds a third on the basis of the double eccentric Eccentricity, or the angle between the centerline of the valve seat cone and the centerline of the pipeline, allows the sealing surface 201 of the butterfly plate 2 to completely disengage from the sealing ring 14 throughout the valve's opening and closing process. This structure utilizes the cam effect while completely eliminating friction and wear. The contact surface between the sealing ring 14 and the valve body 1 is an oblique cone, and the contact angle between the sealing ring 14 and the valve seat creates a slight "wedge effect," causing the sealing ring 14 to move softly and expand radially. The uniform contact between the valve seat and the sealing ring 14, as well as the flexibility of the sealing ring 14, results in a uniform load on the valve seat, achieving the tightest shutoff with minimal torque. The elasticity generated by the torque ensures a tight shutoff, regardless of the flow direction or pressure of the medium, ensuring a two-way zero-leakage seal in the valve seat.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the technical solutions described in the above embodiments can still be modified, or some or all of the technical features therein can be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-cleanability metal hard-sealed butterfly valve, comprising: a valve body (1), a butterfly plate (2) and a valve stem (6), wherein the butterfly plate (2) is rotatably connected to the interior of the valve body (1) via the valve stem (6); Its characteristics are: The bottom of the valve body (1) is provided with a lower flange (8), and the lower flange (8) is fixedly connected to the valve body (1) by fixing bolts (9). A connecting sleeve (10) is integrally connected to the butterfly plate (2). One end of the valve stem (6) is provided with a split ring (19), and the valve stem (6) and the lower flange (8) are rotatably connected to each other via the split ring (19). The other end of the valve stem (6) passes through the connecting sleeve (10) and is driven and connected to the electric actuator (18). The valve body (1) is provided with a pressure ring (3), a plurality of screw holes (4) are opened on the pressure ring (3), and a pressure ring screw (5) is provided in the screw hole (4). The pressure ring (3) is fixedly connected to the valve body (1) through the plurality of pressure ring screws (5). A sealing ring (14) is installed between the pressure ring (3) and the valve body (1), and the contact surface between the valve body (1) and the sealing ring (14) is an oblique cone surface. The valve stem (6) outer sleeve is provided with a first shaft sleeve (16) and a thrust shaft sleeve (15), a dustproof pad A (12) is provided between the first shaft sleeve (16) and the thrust shaft sleeve (15), the dustproof pad A (12) and the first shaft sleeve (16) are fixedly connected to each other, a plurality of dust storage grooves A (17) are provided on the first shaft sleeve (16) and the thrust shaft sleeve (15), a dustproof pad B (13) is provided between the thrust shaft sleeve (15) and the butterfly plate (2), the dustproof pad B (13) and the thrust shaft sleeve (15) are fixedly connected to each other; A winding gasket (21) is provided between the sealing ring (14) and the valve body (1), and the winding gasket (21) and the sealing ring (14) are fixedly connected to each other; A dust storage groove B (20) is provided on the sealing ring (14). The dust storage groove B (20) is arranged on one side of the winding pad (21). The dust storage groove B (20) is used to store excess sealing material extruded after the winding pad (21) is deformed.

2. A high-cleanliness metal hard-sealed butterfly valve according to claim 1, characterized in that: The periphery of the sealing ring (14) is connected to a sealing surface (201), and the sealing surface (201) and the sealing ring (14) are integrally built-up welded, and the sealing surface (201) is made of STL6 hard alloy.

3. The high-cleanliness metal hard-sealed butterfly valve according to claim 1, characterized in that: A packing assembly is provided between the valve stem (6) and the valve body (1), and the packing assembly includes a pressure plate (22), a pressure sleeve (23) and a packing (24). The pressure sleeve (23) is sleeved on the valve stem (6), the pressure plate (22) is fixedly connected to the upper end of the pressure sleeve (23), and a sleeve support ring (25) for supporting the first sleeve (16) is provided at the lower end of the pressure sleeve (23). The packing (24) is provided between the pressure sleeve (23) and the sleeve support ring (25).

4. The high-cleanliness metal hard-sealed butterfly valve according to claim 1, characterized in that: The valve stem (6) and the electric actuator (18) are connected to each other via a key A (7), and the valve stem (6) and the connecting sleeve (10) of the butterfly plate (2) are connected to each other via a key B (11).

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