A high sealing butterfly valve with movable butterfly plate

Abstract

The utility model relates to a high sealing butterfly valve with movable butterfly plate, including valve body, butterfly plate and valve rod, butterfly plate is located in the valve body, butterfly plate is by two butterfly plate side plates of left and right sides and two butterfly plate cover plates of front and back, two butterfly plate side plates are movably connected between two butterfly plate cover plates, the valve rod includes upper valve rod and lower valve rod, upper valve rod is rotatably connected with the upper end of valve body, the lower end of upper valve rod extends into the valve body and is connected and fixed with two butterfly plate cover plates, rotates the whole butterfly plate by upper valve rod, lower valve rod fixedly connected in the lower end of valve body and with upper valve rod coaxial arrangement, the upper end of lower valve rod is fixed with oval axle stub column, this oval axle stub column is located the central axis position between two butterfly plate cover plates, and the long axis of oval axle stub column is perpendicular with the axis of valve body flow -through hole arrangement, the utility model discloses the airtightness of valve by mechanical structure can reduce the friction loss of butterfly plate.

Description

Technical Field

[0001] This utility model relates to the field of butterfly valve technology, specifically to a high-sealing butterfly valve using a movable butterfly plate. Background Technology

[0002] In the prior art, butterfly valves mainly consist of a valve body, a butterfly plate installed in the valve body, and a drive mechanism for driving the butterfly plate to rotate. In order to improve the sealing performance of the butterfly valve, a sealing ring is usually installed on the butterfly plate. However, with the long-term repeated opening and closing of the butterfly valve, the sealing ring will be worn, resulting in a decrease in the sealing performance between the butterfly plate and the inner wall of the valve body, which affects the sealing performance of the butterfly valve. Moreover, the material of the sealing ring is generally polytetrafluoroethylene or synthetic rubber, which cannot be used in high-temperature environments. Summary of the Invention

[0003] The purpose of this invention is to overcome the shortcomings of the prior art and provide a high-sealing butterfly valve using a movable butterfly plate.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A high-sealing butterfly valve with a movable butterfly plate includes a valve body, a butterfly plate and a valve stem. The butterfly plate is located in the valve body. The butterfly plate is composed of two butterfly plate side plates located on the left and right sides and two butterfly plate cover plates located at the front and rear. The two butterfly plate side plates are movably connected between the two butterfly plate cover plates. The valve stem includes an upper valve stem and a lower valve stem. The upper valve stem is rotatably connected to the upper end of the valve body. The lower end of the upper valve stem extends into the valve body and is fixedly connected to two butterfly plate cover plates. The upper valve stem drives the entire butterfly plate to rotate. The lower valve stem is fixedly connected to the lower end of the valve body and is coaxially arranged with the upper valve stem. An elliptical shaft end post is fixed to the upper end of the lower valve stem. The elliptical shaft end post is located at the central axis position between the two butterfly plate cover plates, and the major axis of the elliptical shaft end post is perpendicular to the axis of the flow hole of the valve body. When the upper valve stem drives the entire butterfly plate to rotate and close the valve, the two butterfly plate side plates rotate to the two long shaft ends of the elliptical shaft end column respectively. The two long shaft ends of the elliptical shaft end column push the two butterfly plate side plates to extend in opposite directions and then fit tightly against the inner wall of the valve body flow hole to seal.

[0005] Furthermore, each of the two butterfly plate side panels is provided with a round hole, and the butterfly plate cover is provided with a guide post that is movably connected to the round hole on the corresponding butterfly plate side panel, with a space for movement between the guide post and the corresponding guide hole.

[0006] Furthermore, the upper end of the lower valve stem is provided with a cross shaft, and the interior of the elliptical shaft end post is fitted with the cross shaft of the lower valve stem through a cross hole.

[0007] This invention employs the above technical solution, relying on the long axis end of the elliptical shaft end column connected to the lower valve shaft to push the butterfly plate side plate outward. The outer edge of the butterfly plate side plate presses against the inner wall of the valve body to achieve a seal. The movable butterfly plate can reduce frictional loss and extend service life. Furthermore, the structure of each part of the butterfly plate is simple, easy to manufacture and install. Compared with traditional methods, a sealing ring is not required, making it applicable to some high-temperature scenarios and preventing the sealing ring from deforming under high temperatures. Attached Figure Description

[0008] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a cross-sectional view of the overall structure of this utility model; Figure 3 A schematic diagram of the butterfly plate cover and butterfly plate side panels; Figure 4 This is a schematic diagram of the cross-section of the butterfly plate section; Figure 5 A schematic diagram of the structure of an elliptical shaft-end column; Figure 6 This is a schematic diagram of the lower valve stem. Detailed Implementation

[0009] like Figure 1-6 As shown, this utility model discloses a high-sealing butterfly valve with a movable butterfly plate, comprising a valve body 2, a butterfly plate, and a valve stem.

[0010] The butterfly plate is located inside the valve body 2. The butterfly plate consists of two butterfly plate side plates 4 located on the left and right sides and two butterfly plate cover plates 3 located at the front and rear. The two butterfly plate side plates 4 are movably connected between the two butterfly plate cover plates 3. Specifically, each of the two butterfly plate side plates 4 is provided with a round hole, and the butterfly plate cover plate 3 is provided with a guide post that is movably fitted with the round hole on the corresponding butterfly plate side plate 4. There is a space for movement between the guide post and the corresponding guide hole, so that the two butterfly plate side plates 4 can be connected between the two butterfly plate cover plates 3 and can also slide.

[0011] The valve stem includes an upper valve stem 1 and a lower valve stem 6. The upper valve stem 1 is rotatably connected to the upper end of the valve body 2. The lower end of the upper valve stem 1 extends into the valve body 2 and is fixedly connected to the two butterfly plate cover plates 3 (by bolts). The upper valve stem 1 drives the entire butterfly plate to rotate. The lower valve stem 6 is fixedly connected to the lower end of the valve body 2 and is coaxially arranged with the upper valve stem 1. An elliptical shaft end post 5 is fixed to the upper end of the lower valve stem 6. The elliptical shaft end post 5 is located on the central axis between the two butterfly plate cover plates 3, and the major axis of the elliptical shaft end post 5 is perpendicular to the axis of the flow hole of the valve body 2. With this design, when the valve is closed, the two butterfly plate side plates rotate to the two major axis ends of the elliptical shaft end post 5 respectively. The two major axis ends of the elliptical shaft end post 5 push the two butterfly plate side plates to extend in opposite directions and then tightly fit and seal against the inner wall of the flow hole of the valve body 2.

[0012] The lower valve stem 6 has a cross shaft at its upper end, and the elliptical shaft end post 5 is fitted with the cross shaft of the lower valve stem 6 through a cross hole.

[0013] The working principle of this utility model: When the valve is opened, the upper valve stem 1 provides the power for the butterfly plate to rotate. Then, the upper valve stem 1 drives the butterfly plate cover plate 3 and the butterfly plate side plate 4 to rotate together. At the same time, the elliptical shaft end column 5 and the lower valve stem 6 are fixed on the valve body 2, and the major axis of the elliptical shaft end is perpendicular to the axis of the flow hole of the valve body 2. This makes the outward force of the butterfly plate side plate 4 gradually decrease when the butterfly plate rotates. At the same time, due to the rotation, the valve body 2 squeezes the edges of the two butterfly plate side plates 4, and then the two butterfly plate side plates 4 will slide and retract.

[0014] When the valve is closed, the butterfly plate plane gradually rotates from parallel to the minor axis of the ellipse to parallel to the major axis of the ellipse. As a result, the two butterfly plate side plates 4 are slowly pushed out in opposite directions by the two major axis edges of the central elliptical shaft end post 5 until the outer edges of the two butterfly plate side plates 4 contact the valve body 2, thus achieving a tight seal between the butterfly plate side plates 4 and the inner wall of the flow hole of the valve body 2.

[0015] The specific embodiments of this utility model have been described above. However, those skilled in the art should understand that this is only an example. Those skilled in the art can make various changes or modifications to this embodiment without departing from the principle and essence of this utility model, but all such changes and modifications fall within the protection scope of this utility model.

Claims

1. A high-sealing butterfly valve employing a movable butterfly plate, comprising a valve body, a butterfly plate, and a valve stem, wherein the butterfly plate is located within the valve body, characterized in that: The butterfly plate consists of two butterfly plate side plates located on the left and right sides and two butterfly plate cover plates located at the front and back. The two butterfly plate side plates are movably connected between the two butterfly plate cover plates. The valve stem includes an upper valve stem and a lower valve stem. The upper valve stem is rotatably connected to the upper end of the valve body, and the lower end of the upper valve stem extends into the valve body and is fixedly connected to two butterfly plate cover plates. The upper valve stem drives the entire butterfly plate to rotate. The lower valve stem is fixedly connected to the lower end of the valve body and is coaxially arranged with the upper valve stem. An elliptical shaft end post is fixed to the upper end of the lower valve stem. The elliptical shaft end post is located at the central axis position between the two butterfly plate cover plates, and the major axis of the elliptical shaft end post is perpendicular to the axis of the flow hole of the valve body. When the upper valve stem drives the entire butterfly plate to rotate and close the valve, the two butterfly plate side plates rotate to the two long shaft ends of the elliptical shaft end column respectively. The two long shaft ends of the elliptical shaft end column push the two butterfly plate side plates to extend in opposite directions and then fit tightly against the inner wall of the valve body flow hole to seal.

2. A high-sealing butterfly valve employing a movable butterfly plate according to claim 1, characterized in that: Each of the two butterfly plate side panels has a round hole, and the butterfly plate cover plate has a guide post that is movably connected to the round hole on the corresponding butterfly plate side panel. There is a space for movement between the guide post and the corresponding guide hole.

3. A high-sealing butterfly valve employing a movable butterfly plate according to claim 1, characterized in that: The upper end of the lower valve stem is provided with a cross shaft, and the interior of the elliptical shaft end post is fitted with the cross shaft of the lower valve stem through a cross hole.

Images