High-temperature bidirectional metal sealing control butterfly valve

Abstract

According to the high-temperature bidirectional metal sealing control butterfly valve, an annular groove and an L-shaped annular groove are formed in a valve body, an elastic limiting ring and a rigid limiting ring are arranged in the L-shaped annular groove, a graphite sealing ring is arranged between the valve body and a valve seat, and a pressing plate ring acts on the graphite sealing ring through external force pressurization. The valve seat reverse elastic limiting structure comprises a rigid limiting ring and an elastic limiting ring, and the rigid limiting ring and the elastic limiting ring are arranged between the first step of the valve seat and the valve body. When the annular surface of the valve seat is subjected to high-pressure reverse medium thrust, part of valve seat force is balanced through the elastic force of the corrugations, excessive force is prevented from being applied to the conical sealing surface of the cantilever of the butterfly plate, leakage caused by deformation of the conical sealing surface when the cantilever is greatly bent is avoided, and the rigid limiting ring mainly protects the elastic limiting ring from being excessively compressed to lose elasticity. And the work within an effective elastic range is ensured.

Description

Technical Field

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

[0002] The existing common two-way sealing butterfly valves are generally used at room temperature or below 200℃. The high-temperature two-way sealing butterfly valve is mainly used under high temperature conditions. The non-metallic sealing rings used in the existing designs of common two-way sealing butterfly valves cannot withstand high temperatures, so they cannot be used as high-temperature two-way sealing butterfly valves. When using high-temperature resistant graphite sealing rings for sealing, since the graphite sealing material itself is not elastic, external force is required for sealing. In order to achieve the free reverse movement of the valve seat under reverse pressure, when the valve seat is subjected to high-pressure reverse sealing force, the force will be applied to the sealing surface of the cantilever conical surface of the butterfly plate, causing the cantilever to bend, resulting in deformation of the conical sealing surface and leakage. Summary of the invention In order to solve the technical defects in the prior art, the present invention provides a high-temperature bidirectional metal-sealed control butterfly valve.

[0003] The technical solution adopted by the present invention is: a high-temperature bidirectional metal-sealed control butterfly valve, comprising a valve body, a valve stem is arranged in the valve body, a butterfly plate is connected to the valve stem, and the valve body is provided with a valve seat and a pressure plate ring, the valve seat and the valve body are dynamically sealed, the valve seat and the cantilever of the butterfly plate are sealed, an annular groove and an L-shaped annular groove are also arranged in the valve body, a three-open ring is arranged in the annular groove, an elastic limit ring and a rigid limit ring are arranged in the L-shaped annular groove, and also includes: A graphite sealing ring, which is arranged in a closed space formed by a valve body, a valve seat and a pressure plate ring, and the pressure plate ring is pressurized by an external force to make the graphite sealing ring, the valve seat and the valve body seal and cooperate; The valve seat reverse elastic limiting structure, the bottom of the valve seat is formed with a first step, the valve seat reverse elastic limiting structure comprises a rigid limiting ring and an elastic limiting ring, the rigid limiting ring and the elastic limiting ring are arranged between the first step of the valve seat and the valve body to form the valve seat reverse elastic limiting structure, the elastic force of the corrugation of the elastic limiting ring balances part of the medium thrust when the valve seat is subjected to the high-pressure reverse sealing force, and avoids excessive force being applied to the sealing surface of the cantilever cone of the butterfly plate; A first gap E, wherein the first gap E is the reverse movement range of the valve seat during low-pressure reverse sealing, and the first gap E is the distance from one end of the elastic limiting ring in the horizontal direction to one side of the first step at the bottom of the valve seat; A second gap F, wherein the second gap F is the position at which the valve seat moves in the opposite direction to the limit position under high pressure, and the second gap F is the distance from one end of the rigid limit ring in the horizontal direction to one side of the first step at the bottom of the valve seat; The third gap FE is the range of reverse movement of the valve seat under high pressure. The third gap FE is the width of the second gap F minus the width of the first gap E. The third gap is the elastic range of the effective operation of the elastic limit ring.

[0004] A second step is formed on the valve body, and the elastic limiting ring is arranged between the second step and the rigid limiting ring. The horizontal direction of the rigid limiting ring cooperates with the valve seat to protect the elastic limiting ring from being over-compressed and losing its elasticity.

[0005] The circular ring of the three-open ring is provided with a plurality of adjusting screws, and the adjusting screw is also provided with a nut. The adjusting screw cooperates with the thread of the three-open ring, and then the light hole passes through the pressure plate ring and is squeezed and matched with the valve seat. After the adjusting screw adjusts the valve seat to the required position, the nut on the adjusting screw is locked to prevent the adjusting screw from loosening.

[0006] The circular surface of the three-open ring is also provided with a plurality of mounting screws, which cooperate with the threads of the three-open ring, and then push the pressure plate ring so that the graphite sealing ring has sufficient expansion force to act on the valve seat and between the valve body after being compressed, so that the valve seat and the valve body produce sealing effect and dynamic sealing effect.

[0007] The valve seat is a full metal valve seat, which has a main sealing surface of an inclined cone and a limit step for reverse movement.

[0008] The butterfly plate is of a full metal structure, the sealing ring and the butterfly plate are integrated and have a long cantilever, and the long cantilever can provide a slight elastic force during the sealing process.

[0009] The top of the valve stem is connected with an electric actuator and a worm gear box.

[0010] The elastic limiting ring is composed of a corrugated tube and two rigid rings, and is a multi-stage structure. The rigid limiting ring has an L-shaped cross section and is a multi-stage structure.

[0011] The beneficial effects of the present invention are as follows: the present invention provides a high-temperature bidirectional metal-sealed control butterfly valve, comprising a valve body, an annular groove and an L-shaped annular groove are arranged in the valve body, a three-open ring is arranged in the annular groove, an elastic limit ring and a rigid limit ring are arranged in the L-shaped annular groove, a valve stem is arranged in the valve body, a butterfly plate is connected to the valve stem, a valve seat is arranged on the valve body, a dynamic seal is matched between the valve seat and the valve body, a seal is matched between the valve seat and the cantilever of the butterfly plate, and a graphite sealing ring is also included, which is arranged between the valve body, the valve seat and the pressure plate ring, and the pressure plate ring is pressurized by an external force The graphite sealing ring generates a large expansion force under the action of external force to make the valve body and the valve seat seal together; a first step is formed at the bottom of the valve seat, and the reverse elastic limiting structure of the valve seat includes a rigid limiting ring and an elastic limiting ring. The rigid limiting ring and the elastic limiting ring are arranged between the first step of the valve seat and the valve body to form a reverse elastic limiting structure of the valve seat. The elastic force of the corrugation of the elastic limiting ring balances part of the valve seat force when the valve seat is subjected to the high-pressure reverse sealing force, so as to avoid excessive force being applied to the sealing surface of the cantilever cone of the butterfly plate; the first gap E is the valve seat when the low-pressure reverse sealing is applied. The reverse movement range of the seat, the first gap E is the distance from one end of the elastic limit ring in the horizontal direction to one side of the first step at the bottom of the valve seat; the second gap F is the distance from one end of the rigid limit ring in the horizontal direction to one side of the first step at the bottom of the valve seat; the third gap FE is the range of reverse movement of the valve seat under high pressure, the third gap FE is the width of the second gap F minus the width of the first gap E, and the third gap is the elastic range of effective operation of the elastic limit ring. The present invention realizes the high-temperature dynamic sealing function between the metal valve seat and the valve body through ingenious structural design, and adopts high-temperature resistant graphite for dynamic sealing. The reverse elastic limiting structure of the valve seat adopts a combination of corrugations and two rings. When the valve seat is subjected to high-pressure reverse sealing force, the elastic force of the corrugations balances a part of the medium thrust on the annular surface of the valve seat, avoids excessive force being applied to the conical sealing surface of the butterfly plate cantilever, and avoids deformation of the conical sealing surface and leakage when the cantilever is bent, while the rigid limit ring mainly protects the elastic limit ring from being excessively compressed and losing elasticity, ensuring that it works within the effective elastic range. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the structure of the present invention.

[0013] Figure 2 This is an enlarged view of the structure of location I of the present invention.

[0014] Figure 3 It is a schematic diagram of the structure of the elastic limiting ring of the present invention.

[0015] Figure 4 It is a schematic diagram of the rigid limiting ring structure of the present invention.

[0016] Figure 5 Schematic diagram of the pressure plate ring structure Figure 6 Schematic diagram of three open-loop structure Among them, 1-valve body, 2-valve stem, 3-butterfly plate, 4-valve seat, 5-graphite sealing ring, 6-pressure plate ring, 7-three-open ring, 8-electric actuator, 9-rigid limit ring, 10-elastic limit ring, 11-worm gear box, 71-adjusting screw, 72-nut, 73-mounting screw. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] A high-temperature bidirectional metal-sealed control butterfly valve comprises a valve body 1, wherein a valve stem 2 is arranged in the valve body 1, a butterfly plate 3 is connected to the valve stem 2, a valve seat 4 is arranged on the valve body 1, and the valve seat 4 is a full-metal valve seat having a main sealing surface of an inclined cone and a limit step for moving in the reverse direction. The valve seat 4 is dynamically sealed with the valve body 1, and the valve seat 4 is sealed with the cantilever of the butterfly plate 3. The valve seat 4 also includes: a graphite sealing ring 5, which is arranged between the valve body 1, the valve seat 4 and the pressure plate ring 6. The pressure plate ring 6 acts on the graphite sealing ring 5 by external force. The graphite sealing ring 5 generates a large expansion force under the action of external force to make the valve body and the valve seat 4 seal and cooperate; a valve seat reverse elastic limiting structure, the bottom of the valve seat 4 is formed with a first step, and the valve seat reverse elastic limiting structure includes a rigid limiting ring 9 and an elastic limiting ring 10. The elastic limiting ring (10) is composed of a corrugated tube and two rigid rings, and is a multi-stage structure. The rigid limiting ring (9) is an L-shaped cross section, and is a multi-stage structure. Among them, the elastic limiting ring 10 is a three-stage structure, and the rigid limiting ring 9 is a three-stage structure. The multi-stage structure is convenient to be installed in the L-shaped annular groove. The rigid limit ring 9 and the elastic limit ring 10 are arranged between the first step of the valve seat 4 and the L-shaped annular groove of the valve body 1 to form a reverse elastic limit structure of the valve seat. When the valve seat is subjected to the reverse thrust of the high-pressure medium, the elastic force of the corrugations of the elastic limit ring 10 balances part of the medium thrust when the annular surface of the valve seat 4 is subjected to the reverse sealing force of the high-pressure medium, thereby avoiding excessive force from being applied to the cantilever conical sealing surface of the butterfly plate 3, and avoiding deformation of the conical sealing surface and leakage caused by large bending of the cantilever. A second step is formed on the valve body 1, and the elastic limit ring 10 is arranged between the second step and the rigid limit ring 9. The horizontal direction of the rigid limit ring 9 cooperates with the valve seat 4 to protect the elastic limit ring 10 from being over-compressed and losing its elasticity, ensuring that it works within the effective elastic range. There is a small gap between the rigid limit ring and the valve seat to prevent particles or slag from entering the groove of the elastic limit ring, avoiding excessive accumulation and loss of elasticity after being unable to be compressed; the first gap E, the first gap E is the reverse movement range of the valve seat 4 during low-pressure reverse sealing, and the first gap E is the distance from one end of the elastic limit ring 10 in the horizontal direction to one side of the first step at the bottom of the valve seat 4; the second gap F, the second gap F is the distance from one end of the rigid limit ring 9 in the horizontal direction to one side of the first step at the bottom of the valve seat 4 when the valve seat 4 moves in the reverse direction when the pressure is high, and the second gap F is the distance from one end of the rigid limit ring 9 in the horizontal direction to one side of the first step at the bottom of the valve seat 4; the third gap FE, the third gap FE is the range of reverse movement of the valve seat 4 during high pressure, the third gap FE is the width of the second gap F minus the width of the first gap E, and the third gap is the effective elastic range of the elastic limit ring 10.

[0019] A pressure plate ring 6 is also provided in the valve body 1, and a three-open ring 7 is also provided on the pressure plate ring 6. An adjusting screw 71 is provided on the annular surface of the three-open ring 7, and a nut 72 is also provided on the adjusting screw 71. The adjusting screw 71 is threadedly matched with the three-open ring 7, and is pressed and matched with the valve seat 4 after passing through the light hole of the pressure plate ring 6. A mounting screw 73 is also provided on the annular surface of the three-open ring 7, and the mounting screw 73 is matched with the threaded hole of the three-open ring 7, and then the pressure plate ring 6 is pushed so that the graphite sealing ring 5 has sufficient expansion force to act on the valve seat 4 and between the valve body 1 after being compressed, so that the valve seat 4 and the valve body 1 have a sealing effect and a dynamic sealing effect.

[0020] The butterfly plate is an overall all-metal structure. The sealing ring and the butterfly plate are integrated and have a long cantilever. The long cantilever can provide a small amount of elastic force during the sealing process. The overall all-metal structure is suitable for high temperature working conditions.

[0021] The top of the valve stem 2 is connected to an electric actuator 8 and a worm gear box 11 .

[0022] Technical personnel should note that although the present invention has been described according to the above specific implementation methods, the inventive concept of the present invention is not limited to this invention, and any modification using the inventive concept will be included in the scope of protection of this patent.

[0023] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A high-temperature bidirectional metal-sealed control butterfly valve, comprising a valve body (1), wherein a valve stem (2) is arranged in the valve body (1), and a butterfly plate (3) is connected to the valve stem (2), wherein: The valve body (1) is provided with a valve seat (4) and a pressure plate ring (6); the valve seat (4) and the valve body (1) are dynamically sealed; the valve seat (4) and the cantilever of the butterfly plate (3) are sealed; the valve body (1) is further provided with an annular groove and an L-shaped annular groove; the annular groove is provided with a three-open ring (7); the L-shaped annular groove is provided with an elastic limit ring (10) and a rigid limit ring (9); and further comprises: A graphite sealing ring (5), wherein the graphite sealing ring (5) is arranged in a closed space formed by the valve body (1), the valve seat (4) and the pressure plate ring, and the pressure plate ring (6) applies pressure by external force so that the graphite sealing ring (5) is in sealing cooperation with the valve seat (4) and the valve body (1); A valve seat reverse elastic limiting structure, wherein a first step is formed at the bottom of the valve seat (4), and the valve seat reverse elastic limiting structure comprises a rigid limiting ring (9) and an elastic limiting ring (10), wherein the rigid limiting ring (9) and the elastic limiting ring (10) are arranged between the first step of the valve seat (4) and the valve body (1) to form a valve seat reverse elastic limiting structure, wherein the elastic force of the corrugation of the elastic limiting ring (10) balances part of the valve seat medium thrust when the valve seat (4) is subjected to a high-pressure reverse sealing force, thereby preventing excessive force from being applied to the cantilever cone sealing surface of the butterfly plate (3); a first gap E, wherein the first gap E is the reverse movement range of the valve seat (4) during low-pressure reverse sealing, and the first gap E is the distance from one end of the elastic limiting ring (10) in the horizontal direction to one side of the first step at the bottom of the valve seat (4); a second gap F, wherein the second gap F is the position at which the valve seat (4) moves in the reverse direction to the limit position under high pressure, and the second gap F is the distance from one end of the rigid limit ring (9) in the horizontal direction to one side of the first step at the bottom of the valve seat (4); The third gap FE is the range of reverse movement of the valve seat (4) under high pressure. The third gap FE is the width of the second gap F minus the width of the first gap E. The third gap is the elastic range of effective operation of the elastic limit ring (10).

2. The high temperature bidirectional metal sealing control butterfly valve according to claim 1 is characterized in that: A second step is formed on the valve body (1), and the elastic limiting ring (10) is arranged between the second step and the rigid limiting ring (9). The rigid limiting ring (9) cooperates with the valve seat (4) in a horizontal direction to protect the elastic limiting ring (10) from being over-compressed and losing its elasticity.

3. The high temperature bidirectional metal sealing control butterfly valve according to claim 1, characterized in that: A plurality of adjusting screws (71) are provided on the annular surface of the three-open ring (7), and a nut (72) is also provided on the adjusting screw (71). The adjusting screw (71) is threadedly engaged with the three-open ring (7), and then the light hole passes through the pressure plate ring (6) and is squeezed and engaged with the valve seat (4).

4. The high temperature bidirectional metal sealing control butterfly valve according to claim 3 is characterized in that: A plurality of mounting screws (73) are also provided on the annular surface of the three-open ring (7). The mounting screws (73) are threadedly matched with the three-open ring (7), and then the pressure plate ring (6) is pushed so that the graphite sealing ring (5) has sufficient expansion force to act on the valve seat (4) and between the valve body (1) after being compressed, so that the valve seat (4) and the valve body (1) produce a sealing effect and a dynamic sealing effect.

5. The high temperature bidirectional metal sealing control butterfly valve according to claim 1, characterized in that: The valve seat (4) is a full metal valve seat having a main sealing surface of an inclined cone and a limit step for reverse movement.

6. The high temperature bidirectional metal sealing control butterfly valve according to claim 1, characterized in that: The butterfly plate (3) is of an all-metal structure, and the sealing ring on the butterfly plate is integrated with the butterfly plate and has a relatively long cantilever.

7. The high temperature bidirectional metal sealing control butterfly valve according to claim 1, characterized in that: The top of the valve stem (2) is connected to an electric actuator (8) and a worm gear box (11).

8. The high temperature bidirectional metal sealing control butterfly valve according to claim 1, characterized in that: The elastic limiting ring (10) is composed of a corrugated tube and two rigid rings, and is a multi-segment structure. The rigid limiting ring (9) has an L-shaped cross section and is a multi-segment structure.

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