Three-rod butterfly valve

Abstract

A three-rod butterfly valve belongs to the technical field of valves and comprises a valve body, a butterfly plate, a shaft rod, a driving rod, a driven rod, a fixing seat and a fixing plate. A valve seat is mounted on the inner side of one end of the valve body; one side of the fixing seat is installed at one side end of the butterfly plate, bearings are installed on the rear side and the front side in the upper end of the valve body respectively, the upper ends of the two driving rods are installed at the lower end of a shaft rod respectively, the front side and the rear side of the shaft rod are installed in inner rings of the two bearings respectively, and the front side of the shaft rod and one side of a handle are installed together. The lower ends of the two driving rods and the inner sides of the fixing seats are rotationally installed together, the upper ends of the two fixing seats are installed at the upper end in the valve seat, the upper ends of the two driven rods and the lower ends of the two fixing plates are rotationally installed together respectively, and the lower ends of the two driven rods and the front sides and the rear sides of the outer ends of the fixing seats are rotationally installed together respectively. The inner side end of the valve seat does not need to be machined into an inclined surface, so that the production cost is reduced, a better sealing effect between the valve seat and the butterfly plate can be realized, and the problem of sealing decline caused by deposition of impurities between the valve seat and the limiting ring is reduced.

Description

Technical Field

[0001] This utility model relates to the field of valve equipment technology, and in particular to a three-bar butterfly valve. Background Technology

[0002] A butterfly valve is a type of valve widely used in pipeline systems. Its core components are a disc-shaped butterfly plate, valve body, and valve stem. The butterfly plate rotates inside the valve body, while the upper end of the butterfly plate rotates outside the upper end of the valve body. In application, the operator manually or through a motor reduction mechanism drives the shaft to rotate counterclockwise or clockwise, thereby controlling the amount of fluid flowing in through one end of the pipe and out through the other end of the valve body, or closing the valve.

[0003] While existing butterfly valves meet fluid control needs to some extent, their structural limitations also present several technical challenges. Specifically, to achieve a tight seal between the butterfly plate and valve body ends when the butterfly plate is closed, the valve body ends have beveled surfaces. This increases manufacturing difficulty and production costs. Furthermore, if the bevel machining accuracy is substandard, the sealing surfaces of the butterfly plate and valve body ends cannot be effectively matched, leading to ineffective fluid shut-off. Therefore, it is essential to provide a butterfly valve that is relatively simple to manufacture and can effectively guarantee a sealing effect. Utility Model Content

[0004] To overcome the shortcomings of existing butterfly valves due to structural limitations, as described in the background art, this utility model provides a three-rod butterfly valve where the inner end of the valve body does not need to be machined into a bevel. In application, the active rod and driven rod are manually or electrically driven to rotate along the shaft and fixed seat, respectively, which can control the butterfly plate to move to the left or right to the stop point. This allows the fluid flowing in from one end of the valve body and flowing out from the other end to be fully closed, fully open, or output at different flow rates. This relatively reduces production costs and achieves a better sealing effect between the valve body and the butterfly plate.

[0005] The technical solution adopted by this utility model to solve its technical problem is:

[0006] A three-rod butterfly valve includes a valve body, a butterfly plate, a shaft, a driving rod, a driven rod, a fixed seat, and a fixed plate. The valve body has an inlet end and an outlet end on both sides, and a valve seat is installed on the inner side of one end of the valve body. One side of the fixed seat is installed on one side of the butterfly plate. There are at least two driving rods, two driven rods, and two fixed plates. Bearings are installed on the inner rear side and the front side of the upper end of the valve body. The upper ends of the two driving rods are installed at a distance from each other on the lower end of the shaft. The inner rings of the two bearings are installed on the front and rear sides of the shaft, and the front side of the shaft is located outside the front end of the valve body. The front side of the shaft is installed together with one side of an operating handle. The lower ends of the two driving rods are rotatably installed together with the inner side of the fixed seat. The upper ends of the two fixed seats are installed on the upper end of the valve body. The upper ends of the two driven rods are rotatably installed together with the lower ends of the two fixed plates. The lower ends of the two driven rods are rotatably installed together with the front and rear sides of the outer end of the fixed seat.

[0007] Furthermore, the inner diameter of the valve seat is smaller than the outer diameter of the butterfly plate, and the butterfly plate and the valve seat are in a sealed state when they are in perpendicular contact; when the butterfly plate is in a horizontal state, the shaft and the upper rear end of the valve body are in contact.

[0008] Furthermore, the front side of the shaft can also be installed together with the power output shaft of the motor reduction mechanism.

[0009] Furthermore, the bearing is made of corrosion-resistant stainless steel, and a water seal is installed between the inner and outer rings of the front bearing.

[0010] Furthermore, a drain pipe is installed on the lower end of the valve body, and a drain cover is installed on the lower end of the drain pipe.

[0011] Compared with the prior art, the present invention has the following advantages: (1) The inner end of the valve body (that is, the right side of the valve seat) does not need to be machined into a bevel. In application, the active rod and the driven rod can be manually or electrically controlled to rotate along the shaft and the fixed seat respectively, which can control the butterfly plate to move to the left or right to the stop point, thereby controlling the fluid flowing in from one end of the valve body and flowing out from the other end to be fully closed, fully open, or output different flow rates, thereby relatively reducing the production cost and achieving a better sealing effect between the valve body and the butterfly plate; (2) The present invention also allows the operator to open the drain cover as needed to discharge impurities in the valve body, reducing the problem of impurities depositing between the valve body and the limit ring causing a drop in sealing. In summary, the present invention has good application prospects. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the planar structure of the butterfly plate of this utility model when it is in the closed state;

[0013] Figure 2 This is a schematic diagram of the planar structure of the butterfly plate of this utility model when it is in the fully open state;

[0014] Figure 3This is a partial three-dimensional structural diagram of the present invention. Detailed Implementation

[0015] Figure 1 , 2 As shown in Figure 3, a three-rod butterfly valve includes a cylindrical hollow valve body 1, a butterfly plate 2, a shaft 3, a driving rod 4, a driven rod 5, a "Π"-shaped fixing seat 6, and a fixing plate 7. A water outlet pipe 101 and an inlet / outlet pipe 102 are respectively threaded (via flange structure) onto the inside of the left and right sides of the valve body. An annular hollow valve seat 103 is fixedly installed on the inner side of the left end of the valve body 1, located to the right of the inlet pipe. The left side of the fixing seat 6 is fixedly installed at the middle of the right outer end of the butterfly plate 2. There are two driving rods 4, two driven rods 5, and two fixing plates 7. A bearing 8 is sealed and installed on the inner rear side and the front side of the upper middle part of the valve body 1. The upper ends of the two driving rods 4 are fixedly installed at a distance from each other. At the lower middle of the shaft 3, the front and rear sides of the shaft 3 are respectively fitted inside the inner rings of two bearings 8, and the front side of the shaft 3 is located outside the front end of the valve body 1. The front side of the shaft 3 is fixedly installed together with the left side of an operating handle (not shown in the figure). A rotating rod 41 is fixedly installed at the lower end of the two driving rods 4. The front and rear sides of the rotating rod 41 are rotatably installed together with the front and rear sides of the left end of the fixed seat 6. The upper ends of the two fixed seats 6 are fixedly installed at the front and rear parts of the upper right end of the valve body 1 and located on the right side of the shaft 3. The upper ends of the two driven rods 5 are rotatably installed together with the lower ends of the two fixed plates 7. The lower ends of the two driven rods 5 are rotatably installed together with the front and rear sides of the outer right end of the fixed seat 6.

[0016] Figure 1 , 2 As shown in Figure 3, the inner diameter of the valve seat 103 is smaller than the outer diameter of the butterfly plate 2. When the left side of the butterfly plate 2 and the right side of the valve seat 103 are in perpendicular contact, they form a sealing structure. When the butterfly plate 2 is in a horizontal state, the right end of the shaft 3 contacts the upper rear end of the valve body 1. A sealing ring can also be fixed to the right outer side of the valve seat 103 and the left outer side of the butterfly plate 2 (to achieve a better sealing effect). The front side of the shaft 3 can also be fixedly installed with the power output shaft of the motor reduction mechanism. The bearing 8 is made of corrosion-resistant stainless steel. Water seals are installed between the inner and outer rings of the front bearing 8 at both the front and rear parts (to prevent liquids from leaking out of the valve body). A drain pipe 104 that interacts with the interior is fixedly installed on the lower end of the valve body 1. The drain pipe 104 has a fixed flange on its outer side, and a drain cover 105 is bolted to the lower end of the drain pipe.

[0017] Figure 1 , 2As shown in Figure 3, the inner end of the valve body 1 (that is, the right side of the valve seat 103) does not need to be machined into a bevel, thus reducing production costs. When it is necessary to close the input and output channels of the valve body, the user controls the shaft 3 to rotate clockwise via the handle or the motor reduction mechanism (powered by the positive and negative power input terminals). The upper ends of the driving rod 4 and the driven rod 5 rotate clockwise along the bearing 8 and the lower end of the fixed plate 7 via the shaft 3, respectively. The lower ends of the driving rod 4 and the driven rod 5 drive the fixed seat 6 and the butterfly plate 2 to gradually move to the left from a parallel state. When the operating rod is stopped at different angles or the power output shaft of the motor reduction mechanism (with its power switch off) is not working, the butterfly plate 2 can control the amount of liquid flowing out from the left end and flowing in from the right end of the valve body 1 (the closer the butterfly plate is to horizontal, the larger the amount of fluid entering and exiting; the closer the butterfly plate is to vertical, the smaller the amount of fluid entering and exiting). Specifically, when the left side of the butterfly plate 2 and the right side of the valve seat 103 are in vertical contact, they are in a sealed structure, realizing the complete sealing and cutoff of the fluid entering and exiting the valve body. The user controls the shaft 3 to rotate counterclockwise via a handle or a motor reduction mechanism (powered by both positive and negative input terminals). The upper ends of the driving rod 4 and driven rod 5 rotate counterclockwise along the bearing 8 and the lower end of the fixed plate 7 via the shaft 3, respectively. The lower ends of the driving rod 4 and driven rod 5 drive the fixed seat 6 and the butterfly plate 2 to gradually move to the right from a vertical position. When the operating lever stops rotating at different angles or the power output shaft of the motor reduction mechanism (with its power switch off) is not working, the butterfly plate 2 can control the amount of liquid flowing out from the left end and flowing in from the right end of the valve body 1. Specifically, when the butterfly plate 2 is in a horizontal position, the right end of the shaft 3 contacts the upper rear end of the valve body 1, realizing the full opening of the fluid input and output of the valve body. Through the above, this new invention can achieve a better sealing effect between the valve body 1 and the butterfly plate 2 (overcoming the problem in the prior art that when the machining accuracy of the inclined surface of the valve body is not up to standard, the sealing surfaces of the two sides of the butterfly plate and the two sides of the valve body cannot be effectively matched, resulting in the inability to effectively close the fluid). The new type of valve allows operators to open the drain cover 105 as needed to discharge impurities from the valve body, reducing the problem of impurities depositing between the valve body 1 and the limit ring 103 and causing a decrease in sealing.

[0018] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model.

[0019] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A three-rod butterfly valve, comprising a valve body, a butterfly plate, a shaft, a driving rod, a driven rod, a fixed seat, and a fixed plate; characterized in that, The valve body has an inlet and an outlet on both sides, and a valve seat is installed on the inner side of one end of the valve body. One side of the fixed seat is installed on one side of the butterfly plate. There are at least two driving rods, two driven rods, and two fixed plates. Bearings are installed on the inner rear and front sides of the upper end of the valve body. The upper ends of the two driving rods are installed at a distance from each other on the lower end of the shaft. The inner rings of the two bearings are installed on the front and rear sides of the shaft, and the front side of the shaft is located outside the front end of the valve body. The front side of the shaft is installed together with one side of an operating handle. The lower ends of the two driving rods are rotatably installed together with the inner side of the fixed seat. The upper ends of the two fixed seats are installed on the upper end of the valve body. The upper ends of the two driven rods are rotatably installed together with the lower ends of the two fixed plates. The lower ends of the two driven rods are rotatably installed together with the front and rear sides of the outer end of the fixed seat.

2. A three-rod butterfly valve according to claim 1, characterized in that, The inner diameter of the valve seat is smaller than the outer diameter of the butterfly plate. When one side of the butterfly plate and one side of the valve seat are in perpendicular contact, they are in a sealed state. When the butterfly plate is in a horizontal state, the shaft and the upper rear end of the valve body are in contact.

3. A three-rod butterfly valve according to claim 1, characterized in that, The front side of the shaft can also be installed together with the power output shaft of the motor reduction mechanism.

4. A three-bar butterfly valve according to claim 1, characterized in that, The bearings are made of corrosion-resistant stainless steel, and a water seal is installed between the inner and outer rings of the front bearing.

5. A three-bar butterfly valve according to claim 1, characterized in that, A drain pipe is installed at the lower end of the valve body, and a drain cover is installed at the lower end of the drain pipe.

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