Hard sealing butterfly valve capable of being opened and closed at high frequency

Abstract

The utility model discloses a high-frequency opening and closing hard sealing butterfly valve, belongs to the technical field of valves, and solves the problems that under the condition of high-frequency opening and closing, hard sealing can cause abrasion between a valve plate and the inner wall of a valve body, then the condition that a gap between the valve plate and the inner wall of the valve body is enlarged occurs, and finally the sealing effect of the butterfly valve is linearly reduced. The valve pipes are fixedly connected to the two sides of the valve body and communicated with the valve body, the valve seat is fixedly connected to the valve body, the valve rod is rotationally connected into the valve seat, the valve plate is rotationally connected into the valve body and fixedly connected with one end of the valve rod, the inner diameter of the valve body is smaller than that of the valve pipes, and a hard sealing ring is slidably connected into the valve pipe. When the valve plate seals the valve body, the hard sealing ring is attached to the end face of the valve plate and the end face of the valve body. The piston rod is controlled by the hydraulic cylinder to move to drive the hard sealing ring to displace to ensure sealing, so that the valve plate can maintain a good sealing effect even if the valve plate is frequently opened and closed in the valve body.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a hard-sealed butterfly valve with high-frequency opening and closing. Background Technique

[0002] A butterfly valve is a valve with a simple structure and small volume, mainly used for controlling and regulating the flow of media in a pipeline system. Its working principle is to rotate a disc-shaped butterfly plate 90° around the valve shaft to achieve opening or closing, thereby controlling the passage of fluid. The butterfly valve has the advantages of simple operation, small fluid resistance, light weight, easy installation and maintenance, and is suitable for a variety of media, including water, steam, oil products, corrosive chemicals, etc. Due to its good sealing performance, the butterfly valve is also commonly used in occasions that require frequent opening and closing, such as automatic control systems and emergency cut-off systems.

[0003] Under normal circumstances, the butterfly valve blocks the flow path in the form of hard sealing. Through the surface contact between the valve plate and the inside of the valve body, a fluid film is formed between the tiny gaps of the two under the action of water or gas, and then further blocking is achieved. However, in the face of high-frequency opening and closing, the hard sealing will cause wear between the valve plate and the inner wall of the valve body, and then the gap between the two will increase, and finally the sealing effect of the butterfly valve will drop sharply.

[0004] Therefore, a hard-sealed butterfly valve with high-frequency opening and closing is proposed to solve or alleviate the above problems. Content of the Utility Model

[0005] The purpose of the utility model is to solve the shortcomings existing in the prior art, and a hard-sealed butterfly valve with high-frequency opening and closing is proposed.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0007] A hard-sealed butterfly valve with high-frequency opening and closing, comprising a valve body, valve pipes fixedly connected to both sides of the valve body and communicating with it, a valve seat fixedly connected to the valve body, a valve rod rotatably connected in the valve seat, and a valve plate rotatably connected in the valve body and fixedly connected to one end of the valve rod. The inner diameter of the valve body is smaller than the inner diameter of the valve pipe. A hard sealing ring is slidably connected in the valve pipe. When the valve plate closes the valve body, the hard sealing ring is arranged in a fitting manner with the end faces of the valve plate and the valve body.

[0008] Preferably, a circular annular accommodating cavity is opened in the valve body. A plurality of piston rods penetrating through the valve body to the annular accommodating cavity are fixedly connected to the end face of the hard sealing ring. The annular accommodating cavity is filled with a fluid, and the volume of the fluid can be adjusted.

[0009] Preferably, through holes communicating with the annular accommodation cavity are formed in the outer circle of the valve body, a liquid pipe communicating with the through holes is fixedly connected to the outer circle of the valve body, an adjusting assembly is arranged at one end of the liquid pipe away from the through holes, and the adjusting assembly adjusts the volume of the fluid in the annular accommodation cavity.

[0010] Preferably, the fluid is hydraulic oil.

[0011] Preferably, a connecting sleeve is sleeved outside the liquid pipe, and the connecting sleeve is fixedly connected to the outer circle of the valve pipe through a connecting rod.

[0012] Preferably, the adjusting assembly includes a hydraulic cylinder fixedly connected to one end of the liquid pipe away from the valve body, the telescopic end of the hydraulic cylinder extends into the liquid pipe, and a piston slidably connected in the liquid pipe is fixedly connected to the telescopic end of the hydraulic cylinder.

[0013] The utility model has the following beneficial effects:

[0014] In the utility model, the movement of the piston rod is controlled by the hydraulic cylinder to drive the displacement of the hard sealing ring, so as to ensure the sealing, and the valve plate can maintain a good sealing effect even when it is frequently opened and closed in the valve body. Description of the Drawings

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings required for the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present utility model, and thus should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0016] Figure 1 is a schematic structural diagram of the present utility model;

[0017] Figure 2 is Figure 1 the enlarged view of part A in;

[0018] Figure 3 is a partial cross-sectional view of the present utility model;

[0019] Figure 4 is Figure 3 the enlarged view of part B in;

[0020] Figure 5 is Figure 3 the enlarged view of part C in.

[0021] 1. Valve body; 2. Valve pipe; 3. Valve seat; 4. Liquid pipe; 5. Hydraulic cylinder; 6. Connecting sleeve; 7. Connecting rod; 8. Valve plate; 9. Hard sealing ring; 10. Annular accommodation cavity; 11. Piston rod. Detailed Embodiments

[0022] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some but not all of the embodiments of the present utility model. Components of the embodiments of the present utility model usually described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of the present utility model provided in the accompanying drawings is not intended to limit the scope of the claimed present utility model, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts belong to the scope of protection of the present utility model.

[0024] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0025] In the description of the present utility model, it should be understood that the orientation or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationships when the product of the present utility model is normally placed, or the orientation or positional relationships commonly understood by those skilled in the art. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model.

[0026] In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and should not be construed as indicating or implying relative importance.

[0027] In the description of the present utility model, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0028] High-frequency opening and closing hard-sealed butterfly valves, such as Figure 1 and 3As shown in the figure, it includes a valve body 1, valve pipes 2 fixedly connected to both sides of the valve body 1 and communicating with it, a valve seat 3 fixedly connected to the valve body 1, a valve stem rotatably connected within the valve seat 3, and a valve plate 8 rotatably connected within the valve body 1 and fixedly connected to one end of the valve stem. The inner diameter of the valve body 1 is smaller than the inner diameter of the valve pipe 2. A hard sealing ring 9 is slidably connected within the valve pipe 2. When the valve plate 8 closes the valve body 1, the hard sealing ring 9 is arranged in contact with the valve plate 8 and the end face of the valve body 1.

[0029] As Figure 4 and 5 shown, a circular accommodating cavity 10 is formed within the valve body 1. A number of piston rods 11 are fixedly connected to the end face of the hard sealing ring 9 and penetrate through the valve body 1 into the circular accommodating cavity 10. The circular accommodating cavity 10 is filled with a fluid, and the volume of the fluid can be adjusted. The fluid is hydraulic oil. A through hole communicating with the circular accommodating cavity 10 is formed on the outer circle of the valve body 1, and a liquid pipe 4 fixedly connected to the valve body 1 and communicating with the through hole is provided on the outer circle of the valve body 1. As Figure 2 shown, a connecting sleeve 6 is sleeved outside the liquid pipe 4, and the connecting sleeve 6 is fixedly connected to the outer circle of the valve pipe 2 through a connecting rod 7. An adjusting component is arranged at one end of the liquid pipe 4 far from the through hole, and the adjusting component adjusts the volume of the fluid within the circular accommodating cavity 10.

[0030] The adjusting component includes a hydraulic cylinder 5 fixedly connected to one end of the liquid pipe 4 far from the valve body 1. The telescopic end of the hydraulic cylinder 5 extends into the liquid pipe 4, and a piston slidably connected within the liquid pipe 4 is fixedly connected to the telescopic end of the hydraulic cylinder 5.

[0031] When the present utility model is actually in use, if it is necessary to rotate the valve plate 8 to close the valve body 1, it is necessary to pull the piston at the telescopic end of the hydraulic cylinder 5, so that the available volume within the liquid pipe 4 increases, and then the hydraulic oil within the through hole and the circular accommodating cavity 10 is pumped out, so that the hydraulic pressure within the circular accommodating cavity 10 becomes smaller. In this way, since the piston rod 11 penetrates through the valve body 1 and is both slidably and sealedly arranged, under the influence of the external air pressure, the hard sealing ring 9 will move towards the valve body 1 along with the piston rod 11. The piston rod 11 extends into the circular accommodating cavity 10 until the hard sealing ring 9 is in contact with the end faces of the valve body 1 and the valve plate 8, meeting the conditions for hard sealing. On the contrary, if it is necessary to rotate the valve plate 8 to open the valve body 1, the piston at the telescopic end of the hydraulic cylinder 5 is pushed, so that the available volume within the liquid pipe 4 decreases, and the hydraulic oil is squeezed into the circular accommodating cavity 10 as much as possible. The piston rod 11 is pushed away by the hydraulic oil, and then the hard sealing ring 9 can be separated from the valve body 1 and the valve plate 8, so as to leave sufficient space for the rotation of the valve plate 8, thus making the valve body 1 unblocked. Through the above method, when the valve plate 8 performs high-frequency opening and closing actions within the valve body 1, the gap between the valve plate 8 and the valve body 1 can also be blocked by the hard sealing ring 9, ensuring that it still has a good sealing and blocking effect after high-frequency opening and closing.

[0032] The above are only the preferred embodiments of the present utility model and are not intended to limit the present utility model. For those skilled in the art, various modifications and variations can be made to the present utility model. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. High frequency opening and closing hard seal butterfly valve, characterized by: The invention comprises a valve body (1), a valve tube (2) fixedly connected to both sides of the valve body (1) and communicating therewith, a valve seat (3) fixedly connected to the valve body (1), a valve stem rotatably connected in the valve seat (3), and a valve plate (8) rotatably connected in the valve body (1) and fixedly connected to one end of the valve stem, wherein the inner diameter of the valve body (1) is smaller than the inner diameter of the valve tube (2), a hard sealing ring (9) is slidably connected in the valve tube (2), and when the valve plate (8) closes the valve body (1), the hard sealing ring (9) is arranged to fit the end faces of the valve plate (8) and the valve body (1).

2. The high-frequency opening and closing hard-sealed butterfly valve according to claim 1 is characterized in that: The valve body (1) is provided with an annular accommodating chamber (10), and a plurality of piston rods (11) are fixedly connected to the end surface of the hard sealing ring (9) and penetrate the valve body (1) to the annular accommodating chamber (10). The annular accommodating chamber (10) is filled with a fluid, and the volume of the fluid can be adjusted.

3. The high frequency opening and closing hard seal butterfly valve according to claim 2 is characterized in that: The outer ring of the valve body (1) is provided with a through hole connected to the annular accommodating chamber (10); the outer ring of the valve body (1) is fixedly connected to a liquid pipe (4) connected to the through hole; an adjustment component is provided at one end of the liquid pipe (4) away from the through hole; the adjustment component adjusts the volume of the fluid in the annular accommodating chamber (10).

4. The high frequency opening and closing hard seal butterfly valve according to claim 2 is characterized in that: The fluid is hydraulic oil.

5. The high frequency opening and closing hard seal butterfly valve according to claim 3 is characterized in that: The outer ring of the liquid pipe (4) is provided with a connecting sleeve (6), and the connecting sleeve (6) is fixedly connected to the outer ring of the valve pipe (2) via a connecting rod (7).

6. The high frequency opening and closing hard seal butterfly valve according to claim 3 is characterized in that: The regulating assembly comprises a hydraulic cylinder (5) fixedly connected to an end of a liquid pipe (4) away from the valve body (1), the telescopic end of the hydraulic cylinder (5) extending into the liquid pipe (4), and the telescopic end of the hydraulic cylinder (5) is fixedly connected to a piston slidably connected in the liquid pipe (4).

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