Fixing structure of butterfly valve plate

Abstract

The utility model discloses a fixing structure of a valve plate of a butterfly valve, which relates to the technical field of butterfly valve maintenance and comprises a valve body and the valve plate positioned in the valve body, two sides of the outer wall of the valve body are connected with a sealing seat and a connecting seat, and the other end of the connecting seat is connected with a control device. A rotating shaft connected with the output end of the control device is rotationally connected into the connecting base, a sealing cover is connected to one side of the sealing base through a bolt, and a cavity is formed in the sealing base. According to the fixing structure of the valve plate of the butterfly valve, when the first fixing shaft enters the through hole to support the valve plate, the second fixing shaft can be pushed to stretch into the connecting base and make contact with the rotating shaft, so that the two sides of the valve plate are supported, the installation efficiency is improved, and meanwhile, the fixing structure of the valve plate of the butterfly valve is convenient to use. The valve plate has the effect that the valve plate can be detached by detaching the sealing seat on one side, and the working efficiency during replacement of the valve plate is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of butterfly valve maintenance, and more specifically to a fixing structure of a butterfly valve plate. Background Art

[0002] The butterfly valve is a relatively simple regulating valve, which is widely used in pipeline systems of liquid, gas and some solid particle media to control the flow direction of the fluid, adjust the flow rate or perform simple opening and closing control. Its design features make the butterfly valve very suitable for use in large-diameter pipelines and occasions with limited space.

[0003] There are currently two types of fixed connections between the valve shaft and the valve plate. The first is a single valve stem that runs through the entire valve plate. However, since the valve stem that runs through the valve plate is too long, it will be difficult to pull out the valve plate when it is subsequently disassembled, making the disassembly work inconvenient. The other method is a double valve stem, and the two valve stems fix the valve plate from both sides. For example, Chinese patent application number 202222055556.3 discloses a fixing structure for a butterfly valve plate, in which the valve plate is fixed by two upper and lower fixed shafts. Compared with a single valve stem that is too long, although it has the advantage of being easy to disassemble, when disassembling the valve plate, it is still necessary to remove the sealing structures on both sides of the valve plate at the same time to expose the valve shafts on both sides so that the disassembly can be performed. The process is still too cumbersome.

[0004] The current valve plate fixing structure still has the following problems: when a single valve plate is disassembled, it is only necessary to open the connecting structure on one side of the valve body shell to disassemble the valve stem. However, since the valve stem is too long, it will increase the complexity of pulling it out. Although the double valve stem is shorter and easier to pull out, when disassembling, it is necessary to open the connecting structures on both sides of the valve body shell at the same time to expose the two valve stems, and the process is also more complicated.

[0005] Therefore, it is necessary to propose a fixing structure of a butterfly valve plate to solve the above problems. Utility Model Content

[0006] 1. Technical issues to be resolved

[0007] In view of the above problems, the utility model provides a fixing structure of a butterfly valve plate; it has the function of improving the efficiency of disassembling and assembling the valve plate, and at the same time can increase the sealing performance of the valve plate when it is closed, thereby reducing the leakage flow at the gap.

[0008] (II) Technical solution

[0009] In order to achieve the above-mentioned purpose, the utility model specifically adopts the following technical solutions:

[0010] A fixing structure of a butterfly valve plate, comprising a valve body and a valve plate located in the valve body, a sealing seat and a connecting seat are connected to both sides of the outer wall of the valve body, the other end of the connecting seat is connected to a control device, the interior of the connecting seat is rotatably connected to a rotating shaft connected to an output end of the control device, one side of the sealing seat is connected to a sealing cover by bolts, a cavity is provided inside the sealing seat, a first fixed shaft is axially movable in the cavity, a through hole is provided inside the valve plate, and a second fixed shaft is axially movable in the through hole, the second fixed shaft is rotatably connected to the first fixed shaft, an inner spline is provided inside the valve plate, an outer spline is provided on the outer wall of the second fixed shaft, and the second fixed shaft is spline-connected to the valve plate;

[0011] A spring is connected between the end of the external spline away from the connecting seat and the valve plate, and a spline block is connected to the end of the second fixed shaft away from the connecting seat, and the second fixed shaft is spline-connected to the rotating shaft through the spline block;

[0012] A circumferential array of sliding grooves is provided on the inner wall of the cavity, a circumferential array of bosses is provided on the outer ring surface of one end of the first fixed shaft, the bosses slide in the sliding grooves, one end of the sealing seat is threadedly connected to a threaded push rod, one end of the threaded push rod is pushed on the boss;

[0013] One end of the sealing cover is connected with a support block, and the support block is located in the cavity and abuts against one end of the first fixed shaft.

[0014] Preferably, one end of the first fixed shaft is connected to a sealing rubber ring, and one end of the support block in contact with the first fixed shaft is connected to a gasket.

[0015] Preferably, a pressure bearing is connected to one end of the junction of the first fixed shaft and the second fixed shaft.

[0016] Preferably, the sliding groove comprises a movable area and an installation area which are interconnected, and the threaded ejector rod is located in the movable area.

[0017] Preferably, a retaining ring is connected to the inner annular surface of the valve body, the retaining ring corresponds to the arc surface of the valve plate, and a sealing strip in contact with the retaining ring is connected to the edge of the valve plate.

[0018] Compared with the prior art, the beneficial effects of the utility model are:

[0019] 1. The device is provided with a first fixed shaft and a second fixed shaft that cooperate with each other. When the first fixed shaft enters the through hole to support the valve plate, it can push the second fixed shaft to extend into the connecting seat and come into contact with the rotating shaft, thereby supporting both sides of the valve plate and improving the installation efficiency. At the same time, it has the function of removing the valve plate by disassembling the sealing seat on one side, thereby improving the work efficiency when replacing the valve plate.

[0020] 2. This device is provided with a retaining ring on the inner wall of the valve body. When the valve plate is closed, it can be pressed on the retaining ring, thereby reducing the leakage flow at the gap, which has the effect of improving the stability and transportation efficiency of the pipeline. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional schematic diagram of the structure of the utility model;

[0022] Figure 2 It is a three-dimensional cross-sectional schematic diagram of the structure of the utility model;

[0023] Figure 3 It is a three-dimensional schematic diagram of the connection structure between the valve plate and the second fixed shaft in the utility model;

[0024] Figure 4 It is an exploded three-dimensional cross-sectional schematic diagram of the connection structure between the first fixed shaft and the sealing seat in the utility model;

[0025] Figure 5 It is a three-dimensional cross-sectional schematic diagram of the utility model when the valve plate is closed.

[0026] Reference numerals:

[0027] 101. Valve body; 102. Valve plate; 103. Sealing seat; 104. Connecting seat; 105. Rotating shaft; 106. Sealing cover; 107. Cavity; 108. First fixed shaft; 109. Second fixed shaft; 110. External spline; 111. Spring; 112. Spline block; 113. Sliding groove; 114. Boss; 115. Threaded push rod; 116. Support block; 117. Sealing rubber ring; 118. Gasket; 119. Moving area; 120. Installation area; 121. Retaining ring. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] See also Figure 1-5, a fixing structure of a butterfly valve plate, comprising a valve body 101 and a valve plate 102 located in the valve body 101, the valve plate 102 is rotatably connected to the valve body 101, and flange rings are arranged at the upper and lower ends of the valve body 101, which can be connected to the pipeline through the flange rings. A sealing seat 103 and a connecting seat 104 are connected to the outer wall of the valve body 101 on both sides, and the sealing seat 103 and the sealing cover 106 cooperate with each other to seal the first fixed shaft 108 in the cavity 107, and the connecting seat 104 is used to connect with the control device, and a spring 111 quick-opening device is installed on the control device. Specifically, when the valve plate 102 is in the closed state, the spring 111 in the spring 111 quick-opening device is pre-compressed or maintained in a standby state, so that the valve plate 102 is pressed tightly against the retaining ring 121 to ensure sealing; when the valve plate 102 needs to be opened quickly, the pre-loaded spring 111 energy can be released to quickly push the valve plate 102 away from the retaining ring 121, so as to realize the rapid opening of the valve plate 102. This process is much faster than the traditional method of directly driving the valve plate 102 to open by manual, hydraulic, pneumatic or electric means, because the release of the spring 111 is almost instantaneous, which can increase the opening speed of the valve plate 102. The other end of the connecting seat 104 is connected to the control device. The internal rotation of the connecting seat 104 is connected to a rotating shaft 105 connected to the output end of the control device. The second fixed shaft 109 is connected to the output end of the control device through the rotating shaft 105. The control device drives the second fixed shaft 109 to rotate through the rotating shaft 105. A sealing cover 106 is connected to one side of the sealing seat 103 by bolts. A cavity 107 is provided inside the sealing seat 103. The cavity 107 is used to accommodate the movement of the first fixed shaft 108. The first fixed shaft 108 is axially movable in the cavity 107. A through hole is provided inside the valve plate 102, and a second fixed shaft 109 is axially movable in the through hole. The second fixed shaft 109 is rotatably connected to the first fixed shaft 108.

[0030] Specifically, when the first fixed shaft 108 is inserted into the cavity 107 and the threaded push rod 115 is pressed against the boss 114, the first fixed shaft 108 will be inserted into the through hole in the valve plate 102 and contact one end of the second fixed shaft 109, thereby pushing the second fixed shaft 109 to move. At this time, the spring 111 at one end of the external spline 110 will be compressed, and one end of the second fixed shaft 109 will extend out of the through hole and extend into the connecting seat 104, and come into contact with the rotating shaft 105. The spline block 112 at one end is inserted into the rotating shaft 105, thereby realizing the connection between the rotating shaft 105 and the second fixed shaft 109. An internal spline is provided in the valve plate 102, and an external spline 110 is provided on the outer wall of the second fixed shaft 109. The second fixed shaft 109 is spline-connected to the valve plate 102.

[0031] refer to Figure 2 and Figure 3, a spring 111 is connected between the end of the external spline 110 away from the connecting seat 104 and the valve plate 102. When disassembling, the sealing cover 106 at one end of the sealing seat 103 is removed first. At this time, the threaded push rod 115 can be removed with a practical tool, and the second fixed shaft 109 is reset by the spring 111, thereby pushing the second fixed shaft 109 and the first fixed shaft 108 to move to the other end. At this time, the first fixed shaft 108 will retract into the cavity 107. At this time, one end of the first fixed shaft 108 will also retract from the through hole, so that the first fixed shaft 108 loses its fixing effect on the valve plate 102. At the same time, the second fixed shaft 109 will also retract into the through hole. At this time, the valve plate 102 can be removed from the valve body 101, and the end of the second fixed shaft 109 away from the connecting seat 104 is connected with a spline block 112, and the second fixed shaft 109 is spline-connected to the rotating shaft 105 through the spline block 112;

[0032] refer to Figure 4 The inner wall of the cavity 107 is provided with a circumferential array of sliding grooves 113. Specifically, the sliding groove 113 is divided into two sections. The first section installation area 120 is connected to the outside. When the first fixed shaft 108 is installed in the cavity 107, the boss 114 can be installed from one end of the installation area 120 and moved from the connected slideway to the moving area 119. At this time, the first fixed shaft 108 can move axially. There is a boss 114 in a circumferential array on the outer ring surface of one end of the first fixed shaft 108. 14, the boss 114 slides in the sliding groove 113, and one end of the sealing seat 103 is threadedly connected with a threaded push rod 115, which has the function of pushing the boss 114 to move. Because the valve plate 102 has a spring 111, it is too difficult to push it manually. At this time, the threaded push rod 115 can be rotated by a tool, thereby pushing the first fixed shaft 108 to move toward the second fixed shaft 109, and one end of the threaded push rod 115 is pressed against the boss 114;

[0033] refer to Figure 4 One end of the sealing cover 106 is connected to a support block 116, and the support block 116 is located in the cavity 107. When the first fixed shaft 108 contacts the second fixed shaft 109, only the threaded push rod 115 provides support. At this time, the support block 116 can provide a more stable support effect and rest against one end of the first fixed shaft 108.

[0034] Specifically, refer to Figure 4 One end of the first fixed shaft 108 is connected to a sealing rubber ring 117, which is used to block the gap between the cavity 107 and the inside of the valve body 101 to prevent the material from entering the cavity 107 when conveying the material. The end of the support block 116 in contact with the first fixed shaft 108 is connected to a gasket 118, which plays a supporting role and is made of soft material.

[0035] Specifically, a pressure bearing is connected to one end of the junction of the first fixed shaft 108 and the second fixed shaft 109. The first fixed shaft 108 is fixed on the valve body 101 and is rotatably connected to the valve plate 102, while the second fixed shaft 109 is fixed together with the valve plate 102. At this time, the pressure bearing between the first fixed shaft 108 and the second fixed shaft 109 can play a role in maintaining rotation.

[0036] Specifically, refer to Figure 4 The sliding groove 113 includes a moving area 119 and a mounting area 120 which are interconnected. The threaded push rod 115 is threadedly connected to the sealing seat 103 to push the first fixed shaft 108 to move. The threaded push rod 115 is located in the moving area 119 .

[0037] Specifically, refer to Figure 5 A retaining ring 121 is connected to the inner ring surface of the valve body 101. When the valve plate 102 covers the valve body 101, the edge of the valve plate 102 will be pressed on the retaining ring 121, thereby reducing the leakage flow at the gap, which has the effect of reducing the leakage flow. At the same time, the sealing strip on the edge of the valve plate 102 can increase the sealing effect. The retaining ring 121 corresponds to the arc surface of the valve plate 102, and a sealing strip in contact with the retaining ring 121 is connected to the edge of the valve plate 102.

[0038] In this embodiment, the valve body 101 is connected to the pipeline through a flange ring that is symmetrical up and down. The control device drives the valve plate 102 to rotate through the connection between the rotating shaft 105 and the second fixed shaft 109, thereby controlling the opening and closing of the valve plate 102. A spring 111 quick-opening device is installed on the control device to increase the opening speed of the valve plate 102. When the valve plate 102 is closed, both sides of the valve plate 102 will be pressed on the retaining ring 121 to reduce the leakage flow at the gap, which has the effect of reducing the leakage flow. At the same time, the sealing strip on the edge of the valve plate 102 can further improve the sealing and reduce the leakage flow.

[0039] When the valve plate 102 needs to be replaced, the sealing cover 106 on the sealing seat 103 is disassembled by bolts. At this time, the threaded push rod 115 in the cavity 107 will be exposed, and the threaded push rod 115 can be disassembled by tools. During disassembly, the external spline 110 is pushed by the spring 111 to move toward the cavity 107. When the threaded push rod 115 is removed, the second fixed shaft 109 will retract into the through hole and push the first fixed shaft 108 to move into the cavity 107. At this time, the first fixed shaft 108 can be taken out of the cavity 107. The valve plate 102 is also separated from the valve body 101 and can be removed from the valve body 101, avoiding the need to remove the connecting devices on both sides of the valve body 101 when removing the valve plate 102, thereby improving the efficiency of maintenance. During installation, it is necessary to keep the through hole on the valve plate 102 and the rotating shaft 105 on the same axis. By moving and pushing the first fixed shaft 108, the second fixed shaft 109 is pushed into the connecting seat 104, so that the second fixed shaft 109 can be connected to the rotating shaft 105 through the spline block 112, so that the control device can drive the valve plate 102 to rotate.

[0040] The above-mentioned implementation modes are only preferred implementation modes of the present invention, and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A butterfly valve plate fixing structure, comprising a valve body (101) and a valve plate (102) located in the valve body (101), wherein a sealing seat (103) and a connecting seat (104) are connected to both sides of the outer wall of the valve body (101), the other end of the connecting seat (104) is connected to a control device, and the interior of the connecting seat (104) is rotatably connected to a rotating shaft (105) connected to an output end of the control device, characterized in that: A sealing cover (106) is connected to one side of the sealing seat (103) by bolts, a cavity (107) is provided inside the sealing seat (103), a first fixed shaft (108) is axially movable in the cavity (107), a through hole is provided inside the valve plate (102), and a second fixed shaft (109) is axially movable in the through hole, the second fixed shaft (109) is rotatably connected to the first fixed shaft (108), an internal spline is provided inside the valve plate (102), an external spline (110) is provided on the outer wall of the second fixed shaft (109), and the second fixed shaft (109) is spline-connected to the valve plate (102); A spring (111) is connected between one end of the external spline (110) away from the connection seat (104) and the valve plate (102); one end of the second fixed shaft (109) away from the connection seat (104) is connected to a spline block (112); and the second fixed shaft (109) is spline-connected to the rotating shaft (105) via the spline block (112); A circumferential array of sliding grooves (113) is provided on the inner wall of the cavity (107); a circumferential array of bosses (114) is provided on the outer ring surface of one end of the first fixed shaft (108); the bosses (114) slide in the sliding grooves (113); one end of the sealing seat (103) is threadedly connected to a threaded push rod (115); one end of the threaded push rod (115) is pressed against the boss (114); One end of the sealing cover (106) is connected to a support block (116), and the support block (116) is located in the cavity (107) and abuts against one end of the first fixed shaft (108).

2. A butterfly valve plate fixing structure according to claim 1, characterized in that: One end of the first fixed shaft (108) is connected to a sealing rubber ring (117), and one end of the support block (116) in contact with the first fixed shaft (108) is connected to a gasket (118).

3. A butterfly valve plate fixing structure according to claim 1, characterized in that: One end of the first fixed shaft (108) and the second fixed shaft (109) is connected to a pressure bearing.

4. A butterfly valve plate fixing structure according to claim 1, characterized in that: The sliding groove (113) comprises a movable area (119) and an installation area (120) which are connected to each other, and the threaded push rod (115) is located in the movable area (119).

5. The fixing structure of a butterfly valve plate according to claim 1, characterized in that: A retaining ring (121) is connected to the inner annular surface of the valve body (101), the retaining ring (121) corresponds to the arc surface of the valve plate (102), and a sealing strip in contact with the retaining ring (121) is connected to the edge of the valve plate (102).

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