Airtight anti-corrosion rubber lining butterfly valve

Abstract

The utility model relates to an airtight type anticorrosion rubber lining butterfly valve which comprises a valve body, a valve plate, valve plate rubber lining, valve body rubber lining and a valve shaft, the valve body rubber lining is fixedly connected with the inner wall of the valve body, the valve plate rubber lining is wrapped on the outer side of the valve plate, and the valve plate rubber lining is provided with a valve plate rubber lining inflation ring pipe hole at the outer edge of the valve plate. A valve shaft vent hole is formed in the valve shaft and communicated with the valve plate rubber-lined inflation ring pipe hole. According to the utility model, the valve plate is integrally wrapped by the lining rubber, and the lining rubber at the end part of the valve is made into a tubular hollow inflation ring pipe. When shutoff is needed, the rubber lining valve plate is firstly closed to a shutoff position, and then the inflation ring pipe hole of the rubber lining body of the valve plate is inflated. The valve is closed and sealed through air pressure. According to the rubber lining butterfly valve, the abrasion of the rubber lining is reduced, meanwhile, the whole valve plate is protected and prevented from being corroded, and the service life of the rubber lining butterfly valve can be effectively prolonged.

Description

Technical Field

[0001] The utility model belongs to the field of valves, and in particular relates to an airtight anti-corrosion rubber-lined butterfly valve. Background Art

[0002] Rubber lined butterfly valves are widely used in pipelines under corrosive environments. One is used for regulation, the other is used for shutoff, or both. However, when the rubber lined butterfly valve is used for shutoff, the friction between the rubber lining is large, so a large torque is required for shutoff. In addition, during the shutoff process, the rubber lining of the valve body and the rubber lining of the valve plate contact each other, resulting in a large friction. Therefore, not only a large torque is required, but also severe wear. This greatly reduces the service life of the rubber lined shutoff butterfly valve.

[0003] The patent document with application number CN201410740602.0 discloses an "inner channel inflatable sealed butterfly valve", which includes a valve body, a valve seat and a valve core composed of a valve plate and a valve seat. The valve body is a cylinder with flanges on both ends, with a shaft sleeve and a valve foot respectively provided on the top and bottom, and an annular valve seat provided around the inner wall. An inflatable sealing rubber ring is provided on the outer edge of the valve plate to form a sealing relationship with the valve seat. A valve stem is provided in the middle of the valve body, an inflatable air-blocking valve is provided at the upper end, an inflatable inner channel is provided in the upper section along the central axis, an air inlet is provided on the side, and the inner channel is connected to the air inlet. A sealing ring is provided between the shaft sleeve and the valve stem. The valve plate is composed of a pressure ring, a sealing rubber ring and a disc-shaped bottom plate, and an inflatable sealing rubber ring is sandwiched between the pressure ring and the bottom plate to form a closed air state. This product changes the original inflation valve and inflation tube outside the valve body into an inflation channel, which not only saves costs, but also has a simple overall shape. The inflation device will not be damaged during installation or transportation. The number of air pipe connection points is reduced, making the sealing performance better and the pressure holding time longer. However, since the valve plate needs to clamp an inflatable sealing rubber ring at the end, it needs to adopt a two-layer plate design of a pressure ring and a disc, which will increase the thickness and weight of the valve plate, firstly increasing the manufacturing cost, and secondly increasing the torque when the valve plate rotates. Utility Model Content

[0004] The purpose of the utility model is to provide an airtight anti-corrosion rubber lined butterfly valve, in which the valve plate is wrapped with a rubber lining as a whole, and the rubber lining at the end of the valve is made into a tubular hollow inflatable ring tube. When it is necessary to shut off, the rubber lined valve plate is first closed to the shut-off position, and then the inflatable ring tube hole of the valve plate rubber lining body is inflated. The valve is shut off and sealed by air pressure. While reducing the wear of the rubber lining, the utility model plays a role in protecting and anti-corrosion of the valve plate as a whole, and can effectively extend the service life of the rubber lined butterfly valve.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] An airtight anti-corrosion rubber lined butterfly valve comprises a valve body, a valve plate, a valve plate rubber lining, a valve body rubber lining, and a valve shaft. The valve body rubber lining is fixedly connected to the inner wall of the valve body, the valve plate rubber lining is wrapped around the outside of the valve plate, and the valve plate rubber lining is provided with a valve plate lining rubber inflation ring tube hole at the outer edge of the valve plate, a valve shaft air hole is provided in the valve shaft, and the valve shaft air hole is communicated with the valve plate rubber lining inflation ring tube hole.

[0007] An air guide nozzle is provided between the valve shaft vent hole and the valve plate rubber lining inflation ring tube hole. The air guide nozzle is connected to the valve shaft through a thread. A through hole is provided inside the air guide nozzle. One end of the air guide nozzle is connected to the valve shaft vent hole, and the other end of the air guide nozzle is connected to the valve plate rubber lining inflation ring tube hole.

[0008] The outer circumference of one end of the air guide nozzle extending into the valve plate rubber lining inflation ring tube hole is serrated, and the air guide nozzle and the valve plate rubber lining inflation ring tube hole are expansion-tightly sealed.

[0009] The cross section of the valve plate rubber-lined inflation ring tube hole is a flat long strip hole, and the length direction thereof is parallel to the end face of the valve plate.

[0010] Compared with the existing technology, the beneficial effects of the utility model are:

[0011] 1) The utility model wraps the valve plate with a rubber lining as a whole, which has an anti-corrosion effect on the valve plate as a whole, thereby extending the service life of the valve plate. At the same time, an inflation ring hole is integrally formed at the end of the rubber lining, and the rubber inflation ring hole is integrated with the valve plate, and its structure is more stable.

[0012] 2) The cross section of the inflation ring hole of the utility model is a flat long strip, and its length direction is parallel to the end face of the valve plate, which increases the contact area between the lining rubber at the end of the valve plate and the valve body, increases the sealing surface, and has a better sealing effect.

[0013] 3) The provision of the air guide nozzle of the utility model increases the air tightness of the inflation ring tube hole of the valve plate rubber lining. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 The utility model is a structural schematic diagram of an airtight anti-corrosion rubber lined butterfly valve.

[0015] Figure 2 yes Figure 1 An enlarged cross-sectional view in the II direction.

[0016] Figure 3 yes Figure 1 Magnified image of F.

[0017] In the figure: 1-valve body, 2-valve body rubber lining, 2-1 valve body rubber lining closing surface, 2-2 valve body rubber lining closing surface, 3-valve plate, 4-valve plate rubber lining, 4-1 valve plate rubber lining inflation ring tube hole, 4-2 valve plate rubber lining closing surface, 5-valve shaft, 5-1 valve shaft vent hole, 6-air guide nozzle, 7-closing surface gap. DETAILED DESCRIPTION

[0018] The specific implementation of the utility model is further described below in conjunction with the accompanying drawings:

[0019] See Figure 1-Figure 3 A gas-tight anti-corrosion rubber lined butterfly valve comprises a valve body 1, a valve plate 3, a valve plate rubber lining 4, a valve body rubber lining 2, and a valve shaft 5. The valve body rubber lining 2 is fixedly connected to the inner wall of the valve body 1, the valve plate rubber lining 4 is wrapped around the outside of the valve plate 3, and the valve plate rubber lining 4 is provided with a valve plate rubber lining inflation ring tube hole 4-1 at the outer edge of the valve plate 3, and a valve shaft vent hole 5-1 is provided in the valve shaft 5, and the valve shaft vent hole 5-1 is communicated with the valve plate rubber lining inflation ring tube hole 4-1.

[0020] An air guide nozzle 6 is provided between the valve shaft air vent 5-1 and the valve plate rubber lining inflation ring tube hole 4-1. The air guide nozzle 6 is connected to the valve shaft 5 through a thread. A through hole is provided inside the air guide nozzle 6. One end of the air guide nozzle 6 is connected to the valve shaft air vent 5-1, and the other end of the air guide nozzle 6 is connected to the valve plate rubber lining inflation ring tube hole 4-1.

[0021] The outer circumference of one end of the air guide nozzle 6 extending into the valve plate rubber lining inflation ring tube hole 4-1 is serrated, and the air guide nozzle 6 and the valve plate rubber lining inflation ring tube hole 4-1 are expansion-tightly sealed.

[0022] The embodiment of the utility model only sets the valve shaft vent hole 5-1 on the upper part of the valve shaft 5 for inflating the valve plate rubber lining inflation ring pipe hole 4-1. The valve plate rubber lining inflation ring pipe hole 4-1 is symmetrically arranged at the end of the valve plate in a semicircular arc on both sides of the valve shaft 5 with the valve shaft 5 as the dividing line. The position where the bottom of the valve plate rubber lining inflation ring pipe hole 4-1 contacts the valve shaft 5 is in a self-sealing state, and the position where the upper end of the valve plate rubber lining inflation ring pipe hole 4-1 contacts the valve shaft 5 is expanded and sealed and plugged with the air guide nozzle 6. The air guide nozzle 6 is also symmetrically arranged on both sides of the valve shaft 5.

[0023] The cross section of the valve plate rubber lining inflation ring tube hole 4-1 is a flat long strip hole, and its length direction is parallel to the end face of the valve plate 3. The valve plate rubber lining inflation ring tube hole 4-1 of the utility model is designed to be flat in order to increase the area of ​​the valve plate rubber lining closing surface 4-2, thereby increasing the sealing effect when closing.

[0024] When the butterfly valve needs to be closed, the valve plate 3 is first rotated to the butterfly valve closing position, so that the valve body rubber lining closing surface 2-2 is opposite to the valve plate rubber lining closing surface 4-2, and the closing surface gap 7 is just between the two closing surfaces. At this time, the valve shaft vent hole 5-1 of the valve shaft 5 is inflated, and the pressurized gas enters the valve plate rubber lining inflation ring tube hole 4-1 through the air guide nozzle 6. The inflation pressure continues to increase, and the valve plate rubber lining inflation ring tube hole 4-1 will expand. Because the valve plate rubber lining 4 is fixed on the valve plate 3, the valve plate rubber lining closing surface 4-2 can only expand outward. The inflation pressure continues to increase, and the valve plate rubber lining closing surface 4-2 continues to move outward, so that the closing surface gap 7 continues to shrink until it is closed. Thus, the butterfly valve is closed.

[0025] On the contrary, when the valve shaft vent hole 5-1 is opened and the inflation pressure is returned to zero, the valve plate rubber lining inflation ring tube hole 4-1 is restored to its original state, so that the closing surface gap 7 is restored, and the valve body rubber lining closing surface 2-2 and the valve plate rubber lining closing surface 4-2 are out of contact. At this time, when the shut-off butterfly valve is opened, there is no contact and friction between the valve body rubber lining closing surface 2-2 and the valve plate rubber lining closing surface 4-2, which reduces the torque of opening the valve and the wear of the rubber lining closing surface.

Claims

1. An airtight anti-corrosion rubber lined butterfly valve, characterized in that: It includes a valve body, a valve plate, a valve plate rubber lining, a valve body rubber lining, and a valve shaft. The valve body rubber lining is fixedly connected to the inner wall of the valve body, the valve plate rubber lining is wrapped around the outside of the valve plate, and the valve plate rubber lining is provided with a valve plate lining rubber inflation ring tube hole at the outer edge of the valve plate, and a valve shaft air hole is provided in the valve shaft, and the valve shaft air hole is communicated with the valve plate rubber lining inflation ring tube hole.

2. The airtight anti-corrosion rubber lined butterfly valve according to claim 1 is characterized in that: An air guide nozzle is provided between the valve shaft vent hole and the valve plate rubber lining inflation ring tube hole. The air guide nozzle is connected to the valve shaft through a thread. A through hole is provided inside the air guide nozzle. One end of the air guide nozzle is connected to the valve shaft vent hole, and the other end of the air guide nozzle is connected to the valve plate rubber lining inflation ring tube hole.

3. The airtight anti-corrosion rubber lined butterfly valve according to claim 2 is characterized in that: The outer circumference of one end of the air guide nozzle extending into the valve plate rubber lining inflation ring tube hole is serrated, and the air guide nozzle and the valve plate rubber lining inflation ring tube hole are expansion-tightly sealed.

4. The airtight anti-corrosion rubber lined butterfly valve according to claim 1 is characterized in that: The cross section of the valve plate rubber lining inflation ring tube hole is a flat long strip hole, and the length direction thereof is parallel to the end face of the valve plate.

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