Sealing structure of three-eccentric center butterfly valve

Abstract

The utility model relates to the technical field of three-eccentric center butterfly valve sealing, in particular to a three-eccentric center butterfly valve sealing structure which comprises a three-eccentric center butterfly valve sealing valve plate body, a mounting cavity is formed in the upper end of the three-eccentric center butterfly valve sealing valve plate body, and a three-eccentric center butterfly valve plate sealing groove is formed in the front end of the three-eccentric center butterfly valve sealing valve plate body. A three-eccentric center butterfly valve plate sealing ring is movably installed at the front end of the three-eccentric center butterfly valve plate sealing groove, a sealing limiting groove is formed in the front end of the three-eccentric center butterfly valve plate sealing groove, and the sealing limiting groove is located in the middle of the three-eccentric center butterfly valve plate sealing groove. According to the three-eccentric center butterfly valve sealing structure, the rotation stopping pin for preventing the sealing ring from rotating is arranged between the valve plate and the sealing ring piece, the rotating angle of the sealing ring can be controlled within 1 degree, sealing leakage caused by misalignment of the conical surface due to large-amplitude rotation of the sealing ring is effectively prevented, and meanwhile the automatic energy finding function of the sealing ring and the conical surface of the valve seat can be kept; and the assembly is simplified due to the existence of the rotation stopping pin.

Description

Technical Field

[0001] The utility model relates to the technical field of the seal of a triple eccentric butterfly valve, in particular to a seal structure of a triple eccentric butterfly valve. Background Technique

[0002] A valve stem axis deviates from the center of a butterfly plate and the center of a body at the same time, and a valve seat rotation axis has a certain angle with a valve body passage axis, which is called a triple eccentric butterfly valve. The triple eccentric butterfly valve is widely used in industrial pipelines such as metallurgy, electric power, petrochemical industry, and water supply and drainage and municipal construction where the medium temperature ≤ 425°C, for regulating flow rate and cutting off fluids. The materials are divided into: cast iron, cast steel, and stainless steel.

[0003] Since the sealing surfaces of the sealing rings of the valve seat and valve plate components of the triple eccentric butterfly valve are both conical structures, only cone-to-cone can ensure the valve seal. When the valve is in the long-term open state, due to the long-term action of the medium force, the sealing ring on the valve plate will rotate. When the valve is closed again, the conical sealing surface cannot be automatically aligned, resulting in valve seal leakage. Content of the Utility Model

[0004] The purpose of the utility model is to provide a seal structure of a triple eccentric butterfly valve to solve the problem that when the valve is in the long-term open state, due to the long-term action of the medium force, the sealing ring on the valve plate will rotate. When the valve is closed again, the conical sealing surface cannot be automatically aligned, resulting in valve seal leakage as mentioned in the above background technique. To achieve the above purpose, the utility model provides the following technical solution: A seal structure of a triple eccentric butterfly valve, including a triple eccentric butterfly valve seal valve plate body. An installation cavity is opened at the upper end of the triple eccentric butterfly valve seal valve plate body. A triple eccentric butterfly valve plate seal groove is opened at the front end of the triple eccentric butterfly valve seal valve plate body. A triple eccentric butterfly valve plate sealing ring is movably installed at the front end of the triple eccentric butterfly valve plate seal groove. A seal limit groove is opened at the front end of the triple eccentric butterfly valve seal valve plate body. The seal limit groove is located in the middle of the triple eccentric butterfly valve plate seal groove. A seal anti-rotation pin is movably installed in the middle of the seal limit groove.

[0005] Further preferably, the seal anti-rotation pin is located inside the triple eccentric butterfly valve plate sealing ring. A triple eccentric butterfly valve seal valve plate pressing plate is movably installed in front of the triple eccentric butterfly valve seal valve plate body. An anti-rotation pin for preventing the sealing ring from rotating is arranged between the valve plate and the sealing ring, which can control the rotation angle of the sealing ring within °, effectively preventing the sealing leakage caused by the large rotation of the sealing ring resulting in misalignment of the conical surface, and at the same time can also maintain the automatic alignment function of the sealing ring and the valve seat conical surface; the existence of the anti-rotation pin also simplifies the assembly.

[0006] Further preferably, a pressing plate through-hole is provided in the middle of the pressing plate of the triple-eccentric butterfly valve sealing valve plate, and a pressing plate mounting screw is movably installed at the front end of the pressing plate of the triple-eccentric butterfly valve sealing valve plate, enhancing the stability of the sealing structure during use.

[0007] Further preferably, the pressing plate mounting screw is threadedly connected to the pressing plate of the triple-eccentric butterfly valve sealing valve plate and the body of the triple-eccentric butterfly valve sealing valve plate. A sealing assembly is provided behind the pressing plate of the triple-eccentric butterfly valve sealing valve plate, which can effectively solve the problem of valve sealing leakage caused by the inability of the conical sealing surface to automatically align back when the valve with a conical surface sealing structure is in a long-term open state. It solves the leakage problem of the triple-eccentric butterfly valve with a simple structure, has stronger practicability during use, and can strengthen the tightness of the fit between the anti-rotation pin and the sealing ring during use, enhancing the stability of the sealing structure during practice.

[0008] Further preferably, the sealing assembly includes a graphite sealing gasket, and the graphite sealing gasket is fixedly installed at the rear end of the pressing plate of the triple-eccentric butterfly valve sealing valve plate. By rotating the pressing plate mounting screw, the pressing degree of the pressing plate of the triple-eccentric butterfly valve sealing valve plate on the sealing ring and the anti-rotation pin of the triple-eccentric butterfly valve plate is adjusted, and the sealing performance of the sealing structure is strengthened with the graphite sealing gasket.

[0009] Further preferably, a ceramic fiber is fixedly installed at the rear end of the graphite sealing gasket, and the ceramic fiber is movably connected to the anti-rotation pin and the sealing ring of the triple-eccentric butterfly valve plate. The graphite sealing gasket and the ceramic fiber have good sealing performance, further effectively improving the sealing performance of the sealing structure and enhancing the practicability of the sealing structure during use.

[0010] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0011] In the present utility model, an anti-rotation pin for preventing the sealing ring from rotating is provided between the valve plate and the sealing ring, which can control the rotation angle of the sealing ring within 1°, effectively preventing the sealing leakage caused by the misalignment of the conical surface due to the large rotation of the sealing ring. At the same time, it can also maintain the automatic alignment function between the sealing ring and the valve seat conical surface; the existence of the anti-rotation pin also simplifies the assembly.

[0012] In the present utility model, it can effectively solve the problem of valve sealing leakage caused by the inability of the conical sealing surface to automatically align back when the valve with a conical surface sealing structure is in a long-term open state. It solves the leakage problem of the triple-eccentric butterfly valve with a simple structure and has stronger practicability during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 is a three-dimensional structural schematic diagram of the present utility model;

[0014] Figure 2 is a three-dimensional structural schematic diagram of the pressing plate of the triple-eccentric butterfly valve sealing valve plate of the present utility model;

[0015] Figure 3 Schematic cross-sectional structure diagram of the sealing component of the present utility model;

[0016] Figure 4 Of the present utility model Figure 1 Schematic diagram of the structure at position A in

[0017] Figure 5 Of the present utility model Figure 1 Schematic diagram of the structure at position B in

[0018] In the figure: 1. Sealing valve plate body of the triple eccentric butterfly valve; 2. Installation cavity; 3. Valve plate sealing groove of the triple eccentric butterfly valve; 4. Valve plate sealing ring of the triple eccentric butterfly valve; 5. Sealing limit groove; 6. Sealing anti-rotation pin; 7. Sealing valve plate pressing plate of the triple eccentric butterfly valve; 8. Through hole of the pressing plate; 9. Pressing plate installation screw; 10. Sealing component; 1001. Graphite gasket; 1002. Ceramic fiber; Specific embodiments

[0019] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0020] Please refer to Figures 1 - 5 , the present utility model provides a technical solution: a sealing structure of a triple eccentric butterfly valve, including a sealing valve plate body 1 of the triple eccentric butterfly valve. An installation cavity 2 is opened at the upper end of the sealing valve plate body 1 of the triple eccentric butterfly valve. A valve plate sealing groove 3 of the triple eccentric butterfly valve is opened at the front end of the sealing valve plate body 1 of the triple eccentric butterfly valve. A valve plate sealing ring 4 of the triple eccentric butterfly valve is movably installed at the front end of the valve plate sealing groove 3 of the triple eccentric butterfly valve. A sealing limit groove 5 is opened at the front end of the sealing valve plate body 1 of the triple eccentric butterfly valve. The sealing limit groove 5 is located in the middle of the valve plate sealing groove 3 of the triple eccentric butterfly valve. A sealing anti-rotation pin 6 is movably installed in the middle of the sealing limit groove 5.

[0021] In this embodiment, as Figure 1 , Figure 2 and Figure 4 shown, the sealing anti-rotation pin 6 is located inside the valve plate sealing ring 4 of the triple eccentric butterfly valve. A sealing valve plate pressing plate 7 of the triple eccentric butterfly valve is movably installed in front of the sealing valve plate body 1 of the triple eccentric butterfly valve; the sealing anti-rotation pin 6 located in the middle of the sealing valve plate body 1 of the triple eccentric butterfly valve and inside the valve plate sealing ring 4 limits the valve plate sealing ring 4 of the triple eccentric butterfly valve.

[0022] In this embodiment, as Figure 1 , Figure 2 andFigure 5 As shown, a pressing plate through-hole 8 is provided in the middle of the pressing plate 7 of the triple-eccentric butterfly valve sealing valve plate. A pressing plate mounting screw 9 is movably installed at the front end of the pressing plate 7 of the triple-eccentric butterfly valve sealing valve plate. By rotating the pressing plate mounting screw 9, the pressing degree of the pressing plate 7 of the triple-eccentric butterfly valve sealing valve plate on the valve plate sealing ring 4 and the sealing anti-rotation pin 6 of the triple-eccentric butterfly valve is adjusted, and the sealing performance of the sealing structure is enhanced with the graphite sealing gasket 1001.

[0023] In this embodiment, as Figure 1 、 Figure 2 and Figure 5 shown, the pressing plate mounting screw 9 is threadedly connected to the pressing plate 7 of the triple-eccentric butterfly valve sealing valve plate and the sealing valve plate body 1 of the triple-eccentric butterfly valve. A sealing assembly 10 is provided behind the pressing plate 7 of the triple-eccentric butterfly valve sealing valve plate. When it is necessary to disassemble the sealing anti-rotation pin 6, the sealing structure can be separated by rotating the pressing plate mounting screw 9, and then maintenance, repair and replacement can be carried out.

[0024] In this embodiment, as Figure 2 and Figure 3 shown, the sealing assembly 10 includes a graphite sealing gasket 1001, and the graphite sealing gasket 1001 is fixedly installed at the rear end of the pressing plate 7 of the triple-eccentric butterfly valve sealing valve plate. After assembly, the graphite sealing gasket 1001 fits with the valve plate sealing ring 4 of the triple-eccentric butterfly valve to complete the sealing tightly.

[0025] In this embodiment, as Figure 2 shown, a ceramic fiber 1002 is fixedly installed at the rear end of the graphite sealing gasket 1001, and the ceramic fiber 1002 movably connects the sealing anti-rotation pin 6 and the valve plate sealing ring 4 of the triple-eccentric butterfly valve; the sealing structure effect is enhanced with high-strength heat resistance and sealing performance.

[0026] The usage method and advantages of the present utility model: For this triple-eccentric butterfly valve sealing structure, during use, the working process is as follows:

[0027] As Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 and Figure 5 shown, when the triple-eccentric butterfly valve is in a long-term open state during use, due to the long-term action of the medium force, the valve plate sealing ring 4 on the sealing valve plate body 1 of the triple-eccentric butterfly valve will rotate. When the valve plate sealing ring 4 of the triple-eccentric butterfly valve attempts to rotate, the sealing anti-rotation pin 6 located in the middle of the sealing valve plate body 1 of the triple-eccentric butterfly valve and inside the valve plate sealing ring 4 limits the valve plate sealing ring 4 of the triple-eccentric butterfly valve. By rotating the pressing plate mounting screw 9, the pressing degree of the pressing plate 7 of the triple-eccentric butterfly valve sealing valve plate on the valve plate sealing ring 4 and the sealing anti-rotation pin 6 of the triple-eccentric butterfly valve is adjusted, and the sealing performance of the sealing structure is enhanced with the graphite sealing gasket 1001.

[0028] The basic principles, main features and advantages of the present utility model have been shown and described above. Those skilled in the art should understand that the present utility model is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only preferred examples of the present utility model and are not used to limit the present utility model. Without departing from the spirit and scope of the present utility model, the present utility model will have various changes and improvements, and these changes and improvements all fall within the scope of the present utility model claimed. The scope of protection claimed by the present utility model is defined by the appended claims and their equivalents.

Claims

1. A triple eccentric butterfly valve sealing structure, comprising a triple eccentric butterfly valve sealing valve plate body (1), characterized in that: The upper end of the three-eccentric butterfly valve sealing valve plate body (1) is provided with an installation cavity (2); the front end of the three-eccentric butterfly valve sealing valve plate body (1) is provided with a three-eccentric butterfly valve valve plate sealing groove (3); the front end of the three-eccentric butterfly valve valve plate sealing groove (3) is movably provided with a three-eccentric butterfly valve valve plate sealing ring (4); the front end of the three-eccentric butterfly valve sealing valve plate body (1) is provided with a sealing limit groove (5); the sealing limit groove (5) is located in the middle of the three-eccentric butterfly valve valve plate sealing groove (3); and the middle of the sealing limit groove (5) is movably provided with a sealing stop pin (6).

2. A triple eccentric butterfly valve sealing structure according to claim 1, characterized in that: The sealing stop pin (6) is located inside the sealing ring (4) of the valve plate of the three-eccentric butterfly valve, and a three-eccentric butterfly valve sealing valve plate pressure plate (7) is movably installed in front of the sealing valve plate body (1) of the three-eccentric butterfly valve.

3. A triple eccentric butterfly valve sealing structure according to claim 2, characterized in that: A pressing plate through hole (8) is provided in the middle of the sealing valve plate pressing plate (7) of the three-eccentric butterfly valve, and a pressing plate mounting screw (9) is movably mounted on the front end of the sealing valve plate pressing plate (7) of the three-eccentric butterfly valve.

4. A triple eccentric butterfly valve sealing structure according to claim 3, characterized in that: The pressure plate mounting screw (9) is threadedly connected to the three-eccentric butterfly valve sealing valve plate pressure plate (7) and the three-eccentric butterfly valve sealing valve plate body (1), and a sealing component (10) is arranged behind the three-eccentric butterfly valve sealing valve plate pressure plate (7).

5. A triple eccentric butterfly valve sealing structure according to claim 4, characterized in that: The sealing assembly (10) comprises a graphite sealing gasket (1001), and the graphite sealing gasket (1001) is fixedly mounted on the rear end of a sealing valve plate pressure plate (7) of a triple-eccentric butterfly valve.

6. A triple eccentric butterfly valve sealing structure according to claim 5, characterized in that: A ceramic fiber (1002) is fixedly mounted on the rear end of the graphite sealing gasket (1001), and the ceramic fiber (1002) is movably connected to the sealing stop pin (6) and the valve plate sealing ring (4) of the triple-eccentric butterfly valve.

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