A three-eccentric butterfly valve capable of bidirectional sealing

Abstract

The application discloses a three-eccentric butterfly valve capable of bidirectional sealing, and belongs to the technical field of three-eccentric butterfly valves.The butterfly valve comprises a butterfly valve body, sliding pin shafts and a linkage assembly.A water-contacting disc in the linkage assembly is arranged to face the water flow direction, and the water pressure makes the water-contacting disc move towards the driving connecting shaft, and the linkage driving plates on both sides make the sliding pin shafts on both sides move from the inside to the outside of the sliding bosses, so that the end portions of the sliding pin shafts on both sides can contact the inner wall of the butterfly valve body, and the first return spring is stressed to contract, the friction between the end portions of the sliding pin shafts and the inner wall of the butterfly valve body makes the sealing disc more stable in the butterfly valve body, and the sealing disc can still keep sealing water after the driving connecting shaft is loosened, the design of the concave surface in the water-contacting disc can make the contact area with water larger, and the arrangement of the plurality of water-permeating holes can make water pass through each water-permeating hole when the sealing disc is opened, so that the influence of the water-contacting disc on the flow can be reduced.

Description

Technical Field

[0001] This invention belongs to the technical field of triple eccentric butterfly valves, specifically, it relates to a triple eccentric butterfly valve that can provide bidirectional sealing. Background Technology

[0002] A butterfly valve, also known as a flap valve, is a simple regulating valve. Its opening and closing element is a disc-shaped disc. By rotating the disc around a corresponding axis within the valve body, the valve can open, close, or regulate the flow of the medium. Butterfly valves are not only simple in structure, small in size, lightweight, economical in material consumption, small in installation dimensions, low in driving torque, and easy and quick to operate, but they also possess excellent flow regulation and sealing characteristics, making them one of the fastest-growing valve types in the past decade. Butterfly valves are classified by structure into center-sealed butterfly valves, single-eccentric-sealed butterfly valves, double-eccentric-sealed butterfly valves, and triple-eccentric-sealed butterfly valves.

[0003] Among them, the triple eccentric butterfly valve has three eccentric structures. The first eccentricity refers to the eccentric dimension between the valve stem axis and the radial sealing surface of the butterfly plate, that is, axial eccentricity. The second eccentricity refers to the eccentric dimension between the valve stem axis and the channel axis of the valve body, that is, radial eccentricity. The third eccentricity refers to the oblique cone angle formed between the valve seat seal and the channel axis of the valve body, that is, angular eccentricity. Due to the existence of angular eccentricity, the butterfly plate is usually a right-angle oblique truncated cone, and its outer circumferential surface is an oblique truncated cone curved surface.

[0004] For example, Chinese invention patent CN115264087A discloses a triple-eccentric butterfly valve capable of bidirectional sealing, including a valve body, a valve shaft and a butterfly plate disposed in the valve body, the valve shaft being eccentrically disposed on the bottom surface of the butterfly plate, the projection of the valve shaft axis onto the butterfly plate dividing the butterfly plate into a first plate and a second plate, the sealing assembly including a fixed valve seat and a movable valve seat, the area of ​​the first plate on the side of the butterfly plate opposite to the valve shaft being larger than the area of ​​the second plate, the area of ​​the end face of the movable valve seat on the side opposite to the valve shaft being larger than the difference between the areas of the first and second plates on the side of the butterfly plate opposite to the valve shaft, in use, the movable valve seat can push the butterfly plate which has undergone a small angle of deflection, so that the butterfly plate returns to its original position, thereby the butterfly plate and the movable sealing ring on the fixed valve seat are sealed together and the inner wall surface of the movable valve seat are sealed together, thus making it less likely for liquid leakage to occur.

[0005] While the aforementioned existing technology can improve the sealing performance, if there is any loosening between the valve shaft and the disc, the disc will rotate under the impact of the water pressure inside the pipe, creating a gap between the disc and the valve body, which will cause water in the pipe to leak outward. Summary of the Invention

[0006] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0007] To address the problem mentioned in the background art, where loosening between the valve shaft and the disc causes the disc to rotate under the impact of water pressure inside the pipe, resulting in a gap between the disc and the valve body and causing water leakage from the pipe, the present invention adopts the following technical solution.

[0008] A triple-eccentric butterfly valve capable of bidirectional sealing includes a butterfly valve body, with connecting flanges fixedly connected to both outer walls of the butterfly valve body, a transmission housing installed on the outer wall near the upper end of the butterfly valve body, a drive connecting shaft rotatably connected to the center of the butterfly valve body, the upper end of the drive connecting shaft extending out of the butterfly valve body and detachably connected to the transmission housing, an adjusting handwheel rotatably connected to the outer wall of the transmission housing, and a sealing disc detachably connected to the outer wall of the drive connecting shaft. The sealing disc is characterized by having sliding bosses fixedly connected to both sides of the outer wall near the drive connecting shaft, sliding pins slidably connected to the sliding bosses on both sides, and a linkage assembly installed on the sliding pins on both sides, the linkage assembly causing the sliding pins on both sides to move outward simultaneously.

[0009] Preferably, a water-dividing tip is fixedly connected to the outer wall of the sealing disc away from the water-contacting disc.

[0010] Preferably, mounting cylinder sleeves are embedded in both sides of the inner wall of the butterfly valve body, and first piston blocks are slidably connected inside the mounting cylinder sleeves on both sides. Sealing bosses are fixedly connected to the outer walls of the opposite faces of the first piston blocks on both sides. The sealing bosses on both sides protrude through the inner wall of the butterfly valve body. A second return spring is provided between the first piston block and the inside of the mounting cylinder sleeve. Unlocking components are installed on the outer walls on both sides of the butterfly valve body. The unlocking components reset the sealing bosses and the first piston blocks.

[0011] Preferably, the cylinder liner is provided with sealing bosses on both sides, and the sealing chambers on both sides are slidably connected with second piston blocks. The outer walls of every two opposing second piston blocks are fixedly connected with limiting blocks that protrude from the inner wall of the butterfly valve body. A through hole is provided between the cylinder liner and the sealing bosses.

[0012] Preferably, the linkage assembly includes a water-contacting disc, a linkage drive plate, and a first return spring. The two sealing discs on both sides are rotatably connected to the opposite surfaces of the first piston block. The ends of the two linkage drive plates on both sides are rotatably connected to the water-contacting disc. The outer walls of the two sliding pins on both sides are fixedly connected to limit bosses. The first return spring is provided between the limit bosses on both sides and the sliding bosses.

[0013] Preferably, the outer wall of the water-contacting disc facing the water flow is concave.

[0014] Preferably, the water-contacting disc has multiple water-permeable holes on its outer wall near the sealing disc, with each water-permeable hole penetrating the water-contacting disc.

[0015] Preferably, the unlocking component includes an electric telescopic rod and a reset disc. The electric telescopic rods are detachably connected to the outer walls of both sides of the butterfly valve body. A through-sealing boss is provided on both sides of the mounting cylinder liner near the outer wall of the butterfly valve body. The telescopic ends of the electric telescopic rods on both sides pass through the sealing boss to reach the interior of the mounting cylinder liner.

[0016] Preferably, the telescopic ends of the two electric telescopic rods are detachably connected to reset discs.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] 1. The water-contacting disc in the linkage component is oriented towards the water flow direction. The water pressure causes the water-contacting disc to move towards the drive connection shaft. In conjunction with the linkage drive plates on both sides, the sliding pins on both sides move outward from inside the sliding boss. This allows the ends of the sliding pins on both sides to contact the inner wall of the butterfly valve body. The first return spring is compressed by the force. The friction between the ends of the sliding pins and the inner wall of the butterfly valve body makes the sealing disc more stable inside the butterfly valve body. Even after the drive connection shaft loosens, the sealing disc can still maintain a seal against the water. The concave design of the water-contacting disc allows for a larger contact area with water.

[0019] 2. By setting multiple water-permeable holes, water can pass through each water-permeable hole when the sealing disc is opened, thereby reducing the impact of the water-contacting disc on the flow rate.

[0020] 3. The water flow is distributed to all sides by the pointed part of the water-dividing tip, so that the water pressure is evenly contacted on the outer wall of the sealing disc near the outer edge. This makes the surface pressure of the sealing disc more uniform and less prone to rotation, thereby increasing the sealing effect.

[0021] 4. The sliding pin extends outward and inserts into the sealing bosses on both sides, causing the sealing bosses on both sides to retract inward and compress the second return spring, thereby limiting the position of the sliding pin shafts on both sides and making them more stable.

[0022] 5. When the sealing boss and the first piston block move inward, the air inside the cylinder liner is squeezed towards the sealing boss, thereby squeezing each limiting block outward and placing it on both sides of the sliding pin. After the sliding pin is pulled out, the first piston block and the sealing boss reset, which reduces the pressure inside the sealing boss and causes the limiting blocks on both sides to retract.

[0023] 6. The electric telescopic rod in the unlocking component extends and drives the reset disc to move inside the cylinder liner, thereby resetting the first piston block and the sealing boss, and then resetting the sliding pin, so that the sealing disc can rotate. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of a triple eccentric butterfly valve structure capable of bidirectional sealing according to the present invention;

[0025] Figure 2 This is a schematic diagram of the water-contacting disc structure in this invention;

[0026] Figure 3 This is a schematic diagram of the water-dividing tip structure in this invention;

[0027] Figure 4 This is a schematic cross-sectional view of the butterfly valve body in this invention;

[0028] Figure 5 In this invention Figure 4 Enlarged structural diagram at point A in the middle;

[0029] Figure 6 This is a schematic diagram of the installation structure of the electric telescopic rod and the reset disc in this invention.

[0030] The correspondence between the labels and component names in the attached figures is as follows:

[0031] 100. Butterfly valve body; 101. Connecting flange; 102. Sealing disc; 103. Transmission housing;

[0032] 104. Adjusting handwheel; 105. Drive connecting shaft;

[0033] 200. Water-contacting disc; 201. Linkage drive plate; 202. Sliding pin; 203. Limiting boss;

[0034] 204. First return spring; 205. Sliding boss; 206. Water inlet hole; 207. Water dividing tip;

[0035] 208. Sealed cavity; 209. Sealing boss; 210. First piston block; 211. Through hole;

[0036] 212. Second return spring; 213. Second piston block; 214. Cylinder liner mounting; 215. Limit block;

[0037] 300. Electric telescopic rod; 301. Reset disc. Detailed Implementation

[0038] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0039] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0040] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places throughout this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that mutually excludes other embodiments. The present invention provides the following embodiments.

[0041] like Figure 1 The diagram shows a preferred embodiment of the present invention: a triple eccentric butterfly valve capable of bidirectional sealing. This embodiment includes a butterfly valve body 100. Connecting flanges 101 are fixedly connected to the outer walls of both sides of the butterfly valve body 100. A transmission housing 103 is installed on the outer wall of the butterfly valve body 100 near its upper end. A drive connecting shaft 105 is rotatably connected to the center of the butterfly valve body 100. The upper end of the drive connecting shaft 105 extends out of the butterfly valve body 100 and is detachably connected to the transmission housing 103. An adjusting handwheel 104 is rotatably connected to the outer wall of the transmission housing 103. A sealing disc 102 is detachably connected to the outer wall of the drive connecting shaft 105. In this embodiment, by adjusting the handwheel 104, the drive connecting shaft 105 rotates, thereby allowing the sealing disc 102 to rotate inside the butterfly valve body 100, thus achieving the opening and closing effect. The butterfly valve body 100 can be connected to a pipeline via the connecting flanges 101.

[0042] like Figure 2As shown, this is a schematic diagram of the water-contact disc structure in this embodiment. Sliding bosses 205 are fixedly connected to both sides of the outer wall of the sealing disc 102 near the drive connecting shaft 105. Sliding pins 202 are slidably connected to the sliding bosses 205 on both sides. The sliding pins 202 are parallel to the outer wall of the sealing disc 102. First piston blocks 210 are rotatably connected to the opposite surfaces of the two sealing discs 102. Water-contact discs 200 are rotatably connected to the ends of the two linkage drive plates 201. Limiting bosses 203 are fixedly connected to the outer walls of the two sliding pins 202. A first return spring 204 is provided between the limiting bosses 203 and the sliding bosses 205. In this embodiment, when the sealing disc... When the disc 102 rotates to seal the water, the water-contacting disc 200 faces the direction of water flow. The water pressure causes the water-contacting disc 200 to move towards the drive connecting shaft 105. In conjunction with the two-sided linkage drive plates 201, the two-sided sliding pins 202 move outward from inside the sliding boss 205. This allows the ends of the two-sided sliding pins 202 to contact the inner wall of the butterfly valve body 100. The first return spring 204 is compressed under force. The friction between the ends of the sliding pins 202 and the inner wall of the butterfly valve body 100 makes the sealing disc 102 more stable inside the butterfly valve body 100. Even after the drive connecting shaft 105 loosens, the sealing disc 102 can still maintain a seal against the water.

[0043] It is worth noting that the aforementioned water-contacting disc 200, linkage drive plate 201, and first return spring 204 are linkage components in this embodiment. Linkage components include, but are not limited to, the water-contacting disc 200, linkage drive plate 201, and first return spring 204. Any component that can cause the sliding pins 202 on both sides to move outward simultaneously to contact the inner wall of the butterfly valve body 100 can be applied to this embodiment.

[0044] like Figure 2 As shown, in order to increase the contact area between the water-contacting disc 200 and the water, and to enable it to move better under water pressure, in this embodiment, the outer wall of the water-contacting disc 200 facing the water flow is concave. The concave surface design allows for a larger contact area with the water.

[0045] like Figure 3 As shown, this is a schematic diagram of the water-distributing tip structure in this embodiment. The water-contacting disc 200 is provided with a plurality of water-permeable holes 206 near the outer wall of the sealing disc 102. Each water-permeable hole 206 penetrates the water-contacting disc 200. In this embodiment, the arrangement of multiple water-permeable holes 206 allows water to pass through each water-permeable hole 206 when the sealing disc 102 is opened, thereby reducing the impact of the water-contacting disc 200 on the flow rate.

[0046] like Figure 3As shown, a water-dividing tip 207 is fixedly connected to the outer wall of the sealing disc 102 away from the water-contacting disc 200. In this embodiment, by setting the water-dividing tip 207, when the water-dividing tip 207 faces the water flow direction, the tip of the water-dividing tip 207 can divert the water flow to all directions, so that the water pressure is evenly contacted on the outer wall of the sealing disc 102 near the outer edge, making the surface pressure of the sealing disc 102 more uniform and less prone to rotation, thereby increasing the sealing effect.

[0047] like Figure 4 as well as Figure 5 As shown, it is a schematic diagram of the cross-sectional structure of the butterfly valve body in this embodiment. Figure 4 The enlarged structural diagram at point A shows that mounting cylinder sleeves 214 are embedded in both sides of the inner wall of the butterfly valve body 100. First piston blocks 210 are slidably connected inside the mounting cylinder sleeves 214. Sealing bosses 209 are fixedly connected to the outer walls of the opposite surfaces of the first piston blocks 210. The sealing bosses 209 protrude from the inner wall of the butterfly valve body 100. A second return spring 212 is provided between the first piston block 210 and the mounting cylinder sleeve 214. In this embodiment, the sliding pins 202 on both sides extend outward and insert into the sealing bosses 209 on both sides, causing the sealing bosses 209 on both sides to retract inward and compress the second return spring 212, thereby limiting the position of the sliding pins 202 on both sides and making them more stable.

[0048] like Figure 4 as well as Figure 5 As shown, in order to further fix the position of the sealing disc 102, in this embodiment, sealing bosses 209 are provided on both sides of the mounting cylinder sleeve 214, and second piston blocks 213 are slidably connected inside the sealing cavities 208 on both sides. Limiting blocks 215 that penetrate the inner wall of the butterfly valve body 100 are fixedly connected to the outer walls of every two opposing second piston blocks 213. A through hole 211 is provided between the mounting cylinder sleeve 214 and the sealing bosses 209. In this embodiment, when the sealing bosses 209 and the first piston blocks 210 move inward, the air inside the mounting cylinder sleeve 214 is squeezed towards the sealing bosses 209, thereby squeezing each limiting block 215 outward and located on both sides of the sliding pin 202. After the sliding pin 202 is pulled out, the first piston block 210 and the sealing bosses 209 are reset, which reduces the pressure inside the sealing bosses 209 and causes the limiting blocks 215 on both sides to retract.

[0049] like Figure 5 as well as Figure 6 As shown, this is the embodiment of the present invention. Figure 4The enlarged structural diagram at point A and the installation structure diagram of the electric telescopic rod and the reset disc are shown. The two outer walls of the butterfly valve body 100 are detachably connected to electric telescopic rods 300. The cylinder sleeves 214 on both sides are provided with through sealing bosses 209 near the outer wall of the butterfly valve body 100. The telescopic ends of the electric telescopic rods 300 on both sides pass through the sealing bosses 209 to reach the interior of the cylinder sleeves 214. The telescopic ends of the electric telescopic rods 300 on both sides are detachably connected to the reset discs 301. In this embodiment, when the valve needs to be opened, the electric telescopic rods 300 extend to drive the reset discs 301 to move inside the cylinder sleeves 214, thereby resetting the first piston block 210 and the sealing bosses 209, and then resetting the sliding pin 202, so that the sealing disc 102 can rotate.

[0050] It is worth noting that the electric telescopic rod 300 and the reset disc 301 mentioned above are the unlocking components in this embodiment. The unlocking components include, but are not limited to, the electric telescopic rod 300 and the reset disc 301. Any component that can make the sliding pin 202 pull out from the sealing boss 209 can be applied to this embodiment.

[0051] Working principle: When the sealing disc 102 is closed, the water-contacting disc 200 faces the direction of water flow. Water pressure causes the water-contacting disc 200 to move towards the drive connecting shaft 105. This, combined with the two side linkage drive plates 201, causes the two side sliding pins 202 to move outwards from inside the sliding bosses 205. This allows the ends of the two side sliding pins 202 to contact the inner wall of the butterfly valve body 100, and the first return spring 204 contracts under force. The friction between the ends of the sliding pins 202 and the inner wall of the butterfly valve body 100 makes the sealing disc 102 more stable inside the butterfly valve body 100. Even after the drive connecting shaft 105 loosens, the sealing disc 102 can still maintain a seal against water. The two side sliding pins 202 extend outwards and insert into the two side sealing bosses 209, causing the two side sealing bosses 209 to contract inwards and compress the second return spring 204. The spring 212 limits the position of the sliding pins 202 on both sides, making them more stable. When the sealing boss 209 and the first piston block 210 move inward, they squeeze the air inside the mounting cylinder liner 214 toward the sealing boss 209, thereby squeezing each limiting block 215 outward and positioning it on both sides of the sliding pin 202. After the sliding pin 202 is pulled out, the first piston block 210 and the sealing boss 209 reset, reducing the pressure inside the sealing boss 209 and causing the limiting blocks 215 on both sides to retract. When the valve needs to be opened, the electric telescopic rod 300 extends to drive the reset disc 301 to move inside the mounting cylinder liner 214, thereby resetting the first piston block 210 and the sealing boss 209, and then resetting the sliding pin 202, allowing the sealing disc 102 to rotate.

[0052] The above description, in conjunction with specific embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, several simple deductions or substitutions can be made without departing from the concept of the present invention, and all such deductions or substitutions should be considered to fall within the scope of protection defined by the claims submitted herein.

Claims

1. A triple eccentric butterfly valve capable of bidirectional sealing, comprising a butterfly valve body (100), connecting flanges (101) fixedly connected to the outer walls of both sides of the butterfly valve body (100), a transmission housing (103) installed on the outer wall of the butterfly valve body (100) near the upper end, a drive connecting shaft (105) rotatably connected to the center of the butterfly valve body (100), the upper end of the drive connecting shaft (105) extending out of the butterfly valve body (100) and detachably connected to the transmission housing (103), an adjusting handwheel (104) rotatably connected to the outer wall of the transmission housing (103), and a sealing disc (102) detachably connected to the outer wall of the drive connecting shaft (105), characterized in that, The sealing disc (102) has sliding bosses (205) fixedly connected to both sides of the outer wall near the drive connecting shaft (105). Sliding pins (202) are slidably connected to the sliding bosses (205) on both sides. A linkage component is installed on the sliding pins (202) on both sides. The linkage component causes the sliding pins (202) on both sides to move outward simultaneously. The inner walls of the butterfly valve body (100) are fitted with mounting cylinder sleeves (214) on both sides. The inner walls of the mounting cylinder sleeves (214) on both sides are slidably connected with first piston blocks (210). The outer walls of the opposite sides of the first piston blocks (210) on both sides are fixedly connected with sealing bosses (209). The sealing bosses (209) on both sides protrude from the inner walls of the butterfly valve body (100). A second return spring (212) is provided between the first piston block (210) and the inner wall of the mounting cylinder sleeve (214). Unlocking components are installed on the outer walls of both sides of the butterfly valve body (100). The unlocking components reset the sealing bosses (209) and the first piston blocks (210). The unlocking assembly includes an electric telescopic rod (300) and a reset disc (301). The electric telescopic rods (300) are detachably connected to the outer walls of both sides of the butterfly valve body (100). A through sealing boss (209) is provided on the cylinder liners (214) on both sides near the outer wall of the butterfly valve body (100). The telescopic ends of the electric telescopic rods (300) on both sides pass through the sealing bosses (209) to reach the interior of the cylinder liners (214).

2. The triple eccentric butterfly valve capable of bidirectional sealing according to claim 1, characterized in that, A water-dividing tip (207) is fixedly connected to the outer wall of the sealing disc (102) away from the water-contacting disc (200).

3. The triple eccentric butterfly valve capable of bidirectional sealing according to claim 1, characterized in that, The cylinder liner (214) is mounted on both sides and has a sealing boss (209) on both sides. The sealing cavity (208) on both sides is slidably connected to a second piston block (213). The outer wall of each pair of opposite second piston blocks (213) is fixedly connected to a limiting block (215) that passes through the inner wall of the butterfly valve body (100). A through hole (211) is provided between the cylinder liner (214) and the sealing boss (209).

4. The triple eccentric butterfly valve capable of bidirectional sealing according to claim 3, characterized in that, The linkage assembly includes a water-contacting disc (200), a linkage drive plate (201), and a first return spring (204). The two sealing discs (102) on both sides are rotatably connected to the opposite surfaces of the first piston block (210). The water-contacting disc (200) is rotatably connected to the ends of the two linkage drive plates (201). The outer walls of the two sliding pins (202) on both sides are fixedly connected to limit bosses (203). The first return spring (204) is provided between the two limit bosses (203) and the sliding bosses (205).

5. The triple eccentric butterfly valve capable of bidirectional sealing according to claim 4, characterized in that, The outer wall of the water-contacting disc (200) facing the water flow is concave.

6. The triple eccentric butterfly valve capable of bidirectional sealing according to claim 5, characterized in that, The water-contact disc (200) has multiple water-permeable holes (206) near the outer wall of the sealing disc (102), and each water-permeable hole (206) penetrates the water-contact disc (200).

7. The triple eccentric butterfly valve capable of bidirectional sealing according to claim 1, characterized in that, The telescopic ends of the two electric telescopic rods (300) are detachably connected to a reset disc (301).

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