Butterfly valve with extra-large diameter

Abstract

The utility model provides an extra-large-diameter butterfly valve which comprises a butterfly valve body and a flow channel switch assembly, an upper valve shaft and a lower valve shaft are arranged at the top and the bottom of an inner cavity of the butterfly valve body respectively, and the upper valve shaft and the lower valve shaft are connected with the flow channel switch assembly in a fastening mode through pin shafts. The runner switch assembly is composed of a butterfly plate, a sealing ring, a gasket, a supporting ring, a pressing ring, a bolt, a spring washer and a pin key, the butterfly plate is connected with the upper valve shaft and the lower valve shaft in a matched mode, the gasket is placed in an annular groove of the butterfly plate and connected with the sealing ring in a pressing mode, and the supporting ring is arranged at the end of the sealing ring and located through the pin key. The outer edge of the sealing ring can partially extend out of the butterfly plate and the compression ring, and the ratio of the area of the extending part of the sealing ring to the area of the contact part of the sealing ring and the compression ring is as small as possible, so that the extending part of the sealing ring has enough rigidity and cannot deform under the action of a pipeline medium, and the reliable sealing performance is ensured.

Description

Technical Field

[0001] The utility model belongs to the technical field of butterfly valves and relates to an extra-large caliber butterfly valve. Background Art

[0002] The production of extra-large-caliber butterfly valves is obviously much more difficult than that of conventional butterfly valves, and once a problem occurs, the losses caused are much greater than those of conventional ones. The reinforcing rib structure of the valve body and butterfly plate in the existing technical solution obviously cannot meet the manufacturing requirements of the blank. For butterfly valves, the blanks of the valve body and butterfly plate are generally cast, and the reasonable setting of reinforcing ribs can well balance the stress of the cast blank during the cooling and shaping process, which is very important to ensure the final quality of the blank.

[0003] The sealing ring is what really realizes the sealing effect of the butterfly valve. When the butterfly valve is closed, the sealing ring will fit with the valve seat to achieve sealing. Therefore, the outer edge of the sealing ring will extend out from the butterfly plate and the pressure ring. The ratio of the area of ​​the sealing ring extending out to the area of ​​the contact part between the sealing ring and the pressure ring should be as small as possible, so that the extended part of the sealing ring can have sufficient rigidity and will not be deformed under the action of the pipeline medium, thereby ensuring reliable sealing performance. If the existing technical solution is still maintained for the extra-large diameter butterfly valve, the ratio of the area of ​​the sealing ring extending out to the area of ​​the contact part between the sealing ring and the pressure ring is Not small enough, because the outer diameter of the sealing ring of the extra-large diameter butterfly valve is much larger than the conventional one, but the thickness is only increased by 2-3mm. The ratio of thickness to outer diameter can reach an astonishing 1:2000 or more. In this case, the stiffness of the sealing ring is obviously far from enough. Therefore, the ratio of the protruding area of ​​the sealing ring on the extra-large diameter butterfly valve to the contact area of ​​the sealing ring and the pressure ring must be further reduced to meet the stiffness requirements for long-term reliable sealing performance. The outer circle of the pressure ring obviously cannot be expanded at will, because it is necessary to avoid the pressure ring from hitting the valve seat during the opening and closing of the butterfly valve.

[0004] Combined with the above: the shortcomings of the existing technical solutions are summarized as follows:

[0005] (1) The rib structure cannot balance the stress during the cooling and shaping of the blank.

[0006] (2) The sealing assembly structure cannot ensure the rigidity of the sealing ring. Summary of the invention

[0007] The purpose of the utility model is to provide an extra-large caliber butterfly valve to solve the problems raised in the above background technology.

[0008] The purpose of the utility model can be achieved through the following technical solutions: a butterfly valve of extra-large diameter, comprising a butterfly valve body and a flow channel switch assembly, wherein the top and bottom of the inner cavity of the butterfly valve body are respectively provided with an upper valve shaft and a lower valve shaft, wherein the upper valve shaft and the lower valve shaft are fastened to the flow channel switch assembly through a pin shaft, and the flow channel switch assembly is composed of a butterfly plate, a sealing ring, a gasket, a support ring, a pressure ring, a bolt, a spring washer and a pin key, wherein the butterfly plate is cooperatively connected with the upper valve shaft and the lower valve shaft and the gasket is placed in the annular groove of the butterfly plate and crimped with the sealing ring, the support ring is arranged at the end of the sealing ring and is positioned by a pin key, the support ring is pressed against the sealing ring by a pressure ring, and the pressure ring is connected to the butterfly plate by bolts and spring washers.

[0009] In the above-mentioned extra-large-caliber butterfly valve, a plurality of vertical reinforcing ribs and a plurality of transverse reinforcing ribs are arranged at the outer ring of the butterfly valve body, and the plurality of vertical reinforcing ribs and the plurality of transverse reinforcing ribs are staggeredly distributed.

[0010] In the above-mentioned extra-large caliber butterfly valve, the surface of the butterfly plate is provided with a mesh-distributed reinforcing rib network, and the matching parts of the upper valve shaft and the butterfly plate and the matching parts of the lower valve shaft and the butterfly plate are both provided with reinforcing blocks.

[0011] In the above-mentioned extra-large-caliber butterfly valve, an actuator is installed at the top end of the butterfly valve body, and the output end of the actuator is connected to one end of the upper valve shaft.

[0012] Compared with the prior art, the utility model has the following advantages for an extra-large-caliber butterfly valve: a portion of the outer edge of the sealing ring will extend from the butterfly plate and the pressure ring, and the ratio of the area of ​​the extended portion of the sealing ring to the area of ​​the contact portion between the sealing ring and the pressure ring should be as small as possible, so that the extended portion of the sealing ring can have sufficient rigidity and will not be deformed under the action of the pipeline medium, thereby ensuring reliable sealing performance; transverse reinforcement ribs and longitudinal reinforcement ribs are arranged on the butterfly valve body, and the number is further increased to form a mesh reinforcement rib, which will greatly improve the strength of the parts, and can well balance the stress generated by the butterfly valve body and the butterfly plate when cooling after demolding, thereby ensuring the quality of the blank; since the position where the butterfly plate cooperates with the upper valve shaft and the lower valve shaft needs to withstand the huge torque during the switching process of the butterfly valve, reinforcement blocks are added to the corresponding positions. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The utility model is a schematic diagram of the planar structure of a butterfly valve with a particularly large diameter.

[0014] Figure 2 The utility model is a structural schematic diagram of a butterfly plate of a butterfly valve with a particularly large diameter.

[0015] Figure 3 This utility model is a large-caliber butterfly valve Figure 1 Schematic diagram of the cross-sectional structure.

[0016] Figure 4 This utility model is a large-caliber butterfly valve Figure 3 Schematic diagram of the enlarged structure at location I.

[0017] Figure 5 This utility model is a large-caliber butterfly valve Figure 3 Schematic diagram of the enlarged structure at II.

[0018] Figure 6 The utility model is a three-dimensional structural schematic diagram of a butterfly valve body with a particularly large diameter.

[0019] Figure 7 The utility model is a three-dimensional structural schematic diagram of a butterfly plate of a butterfly valve with a particularly large diameter.

[0020] In the figure, 1. butterfly valve body; 2. pin shaft; 3. lower valve shaft; 4. butterfly plate; 5. upper valve shaft; 6. actuator; 7. sealing ring; 8. gasket; 9. support ring; 10. pressure ring; 11. bolt; 12. spring washer; 13. pin key; 14. vertical reinforcement rib; 15. horizontal reinforcement rib; 16. reinforcement block. DETAILED DESCRIPTION

[0021] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solution of the present invention, but the present invention is not limited to these embodiments.

[0022] like Figure 1 , Figure 2 and Figure 3 As shown, the utility model is a butterfly valve with extra large diameter;

[0023] Embodiment: The butterfly valve includes a butterfly valve body 1 and a flow channel switch assembly. The top and bottom of the inner cavity of the butterfly valve body 1 are respectively provided with an upper valve shaft 5 and a lower valve shaft 3. An actuator 6 is installed on the top of the butterfly valve body 1. The output end of the actuator 6 is connected to one end of the upper valve shaft 5. The upper valve shaft 5 and the lower valve shaft 3 are fastened to the flow channel switch assembly through a pin shaft 2. The flow channel switch assembly consists of a butterfly plate 4, a sealing ring 7, a gasket 8, a support ring 9, a pressure ring 10, a bolt 11, a spring washer 12 and a pin key 13. The butterfly plate 4 is connected with the upper valve shaft 5 and the lower valve shaft 3 and the gasket 8 is placed in the annular groove of the butterfly plate 4 and pressed with the sealing ring 7. The support ring 9 is arranged at the end of the sealing ring 7 and is positioned by the pin key 13. The support ring 9 is pressed against the sealing ring 7 by the pressure ring 10, and the pressure ring 10 is connected to the butterfly plate 4 by bolts 11 and spring washers 12.

[0024] The outer ring of the butterfly valve body 1 is provided with a plurality of vertical reinforcing ribs 14 and a plurality of transverse reinforcing ribs 15, which are staggered; the surface of the butterfly plate 4 is provided with a mesh of reinforcing ribs, and the matching parts of the upper valve shaft 5 and the butterfly plate 4 and the matching parts of the lower valve shaft 3 and the butterfly plate 4 are provided with reinforcing blocks 16. The purpose of the above arrangement is to be able to well balance the stress generated by the butterfly valve body 1 and the butterfly plate 4 when cooling after demolding, so as to ensure the quality of the blank. The position where the butterfly plate 4 matches with the upper valve shaft 5 and the lower valve shaft 3 can withstand the huge torque during the opening and closing process of the butterfly valve.

[0025] Main structure: The main body of the butterfly valve in this technical solution is the butterfly valve body 1, and the switch assembly in the flow channel is composed of a butterfly plate 4, a sealing ring 7, a gasket 8, a support ring 9, a pressure ring 10, a bolt 11, a spring washer 12 and a pin key 13. The sealing ring 7, the gasket 8, the support ring 9, the pressure ring 10, the bolt 11, and the spring washer 12 constitute the sealing assembly. The gasket 8 is placed on the annular groove of the butterfly plate 4, and then the sealing ring 7 is pressed on. The gasket 8 plays a sealing role to prevent the medium in the pipeline from entering the butterfly plate. 4 and the sealing ring 7, then the support ring 9 is pressed on the sealing ring 7, and the pressure ring 10 is pressed on the support ring 9, and then the whole sealing assembly is kept tight by the bolts 11 and the spring washers 12, and the pin key 13 plays a positioning role to help correct installation; the switch assembly is fixed with the upper valve shaft 5 and the lower valve shaft 3 by the pin shaft 2, and the actuator 6 can be operated to rotate the upper valve shaft 5, thereby driving the switch assembly to perform a switching action. When closed, the sealing ring 7 fits tightly with the valve seat on the valve body 1 to achieve sealing.

[0026] The reason why the sealing assembly structure of the prior art solution is not applicable to the extra-large caliber butterfly valve is mainly because the outer circle of the pressure ring 10 cannot be expanded at will, otherwise the switch assembly is easy to hit the valve seat on the valve body 1 when performing the switch action, which is absolutely not allowed. In order to solve the above problem, a support ring 9 is added between the sealing ring 7 and the pressure ring 10, and the support ring 9 can be made thinner and does not need to be as thick as the pressure ring 10, so the outer circle of the support ring 9 can be further expanded, so that the ratio of the area of ​​the protruding part of the sealing ring 7 to the area of ​​the contact part of the sealing ring 7 and the pressure ring 10 can become small enough, so that the protruding part of the sealing ring 7 can reach a certain rigidity and is not easily deformed, so as to achieve reliable sealing performance.

[0027] The contents not described in detail in this specification belong to the prior art known to the professional and technical personnel in this field. The specific embodiments described in this article are only used to illustrate the spirit of the utility model. The technicians in the technical field of the utility model can make various modifications or supplements to the specific embodiments described or replace them in a similar way, but they will not deviate from the spirit of the utility model or exceed the scope defined by the attached claims.

Claims

1. An extra-large caliber butterfly valve, comprising a butterfly valve body (1) and a flow channel switch assembly, characterized in that: An upper valve shaft (5) and a lower valve shaft (3) are respectively arranged at the top and bottom of the inner cavity of the butterfly valve body (1), and the upper valve shaft (5) and the lower valve shaft (3) are fastened to the flow channel switch assembly through a pin shaft (2). The flow channel switch assembly consists of a butterfly plate (4), a sealing ring (7), a gasket (8), a support ring (9), a pressure ring (10), a bolt (11), a spring washer (12) and a pin key (13). The butterfly plate (4) is matched with the upper valve shaft (5) and the lower valve shaft (3), and the gasket (8) is placed in the annular groove of the butterfly plate (4) and pressed with the sealing ring (7). The support ring (9) is arranged at the end of the sealing ring (7) and is positioned by a pin key (13). The support ring (9) is pressed against the sealing ring (7) through a pressure ring (10), and the pressure ring (10) is connected to the butterfly plate (4) through a bolt (11) and a spring washer (12).

2. The extra-large caliber butterfly valve according to claim 1, characterized in that: A plurality of vertical reinforcing ribs (14) and a plurality of transverse reinforcing ribs (15) are arranged at the outer ring of the butterfly valve body (1), and the plurality of vertical reinforcing ribs (14) and the plurality of transverse reinforcing ribs (15) are distributed in a staggered manner.

3. The extra-large caliber butterfly valve according to claim 1, characterized in that: The surface of the butterfly plate (4) is provided with a mesh-shaped reinforcement rib network, and the matching parts of the upper valve shaft (5) and the butterfly plate (4) and the matching parts of the lower valve shaft (3) and the butterfly plate (4) are both provided with reinforcement blocks (16).

4. The extra-large caliber butterfly valve according to claim 1, characterized in that: An actuator (6) is installed at the top end of the butterfly valve body (1), and the output end of the actuator (6) is connected to one end of the upper valve shaft (5).

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