Large-diameter butterfly valve with high sealing performance

Abstract

The invention discloses a large-diameter butterfly valve with high sealing performance, and relates to the technical field of butterfly valve equipment. A valve seat is arranged on the inner side of the valve body, a rotating piece is installed on one side of the valve body, a valve rod is installed on one side of the rotating piece, a valve clack piece is installed at one end of the valve rod, a plurality of reinforcing plates are installed on the valve clack piece, reinforcing rings are fixedly connected to the circumferential side face of the valve clack piece, sealing cavities are formed in the two sides of the valve seat, and sealing pieces are fixedly connected into the sealing cavities. The two sides of one end of the valve body are each provided with an air tap, and the air taps communicate with the sealing cavities on the adjacent sides. The sealing cavities are formed in the two sides of the valve seat, the outer rubber ring used for being connected with the valve clack is installed on the inner wall of the valve seat, and the inner fixed ring with the steel connecting nail is arranged on the inner side of the outer rubber ring for structure enhancement, so that the service life of the valve is prolonged in the mode of reducing the exposed area and enhancing the structural strength; the steel connecting nails on the two sides are matched with the air tap so that the valve clack can be effectively wrapped by the outer rubber ring, and the sealing performance of the butterfly valve is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of butterfly valve equipment, and in particular to a large-diameter butterfly valve with high sealing performance. Background Art

[0002] Large-diameter butterfly valve is a valve used for large-diameter pipelines. It has a wide range of nominal diameters and has the advantages of compact structure, convenient operation, good sealing performance, and low pressure loss. It is widely used in water treatment, petrochemical, electric power, metallurgy and other industries. It is suitable for a variety of media and working conditions. Maintaining sealing during its operation is more important.

[0003] Patent specification CN113154060B discloses a butterfly valve with a compensating seal. The compensating seal is installed inside the valve body, with both ends of the diaphragm seal fixedly mounted inside the valve body. A control chamber is provided between the periphery of the diaphragm seal and the valve body. The inner ring of the diaphragm seal is in contact with the outer edge of the valve plate, and one end of the power source passes through the side wall of the valve body and is connected to the control chamber.

[0004] When in use, this butterfly valve is provided with an annular mounting seat inside the valve seat, and a diaphragm seal is installed in the annular mounting seat. At the same time, an annular protrusion is provided on the adjacent side of the diaphragm seal to contact the valve disc. When the valve disc closes the valve body, a medium is injected into the diaphragm seal to make it abut against the annular protrusion structure, thereby achieving a sealing effect. The disadvantage of this technical solution is that the diaphragm seal structure is made of a flexible material as a whole and is exposed in the channel through which the fluid passes inside the valve seat. During long-term use, it will quickly age and fail due to the high-pressure and high-area exposure. When the valve disc is closed, the fluid pressure is concentrated on the annular protrusion position on the side of the valve disc. The valve disc body is an integrated hollow structure, which leads to a low overall structural strength of the valve disc. The low-strength valve disc is prone to deformation of the sealing surface during long-term use, thereby affecting its sealing performance. Summary of the Invention

[0005] The purpose of the present invention is to provide a large-diameter butterfly valve with high sealing performance. The technical problems to be solved are as follows: When the existing butterfly valve is in use, the diaphragm seal used for telescopic control of the sealing state is in a long-term exposed state, has a short service life and needs to be replaced frequently.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A large-diameter butterfly valve with high sealing performance includes a valve body, a valve seat is provided on the inside of the valve body, and a rotating part is installed on one side, a valve stem is installed on one side of the rotating part, a valve flap part is installed on one end of the valve stem, the valve flap part is detachably connected to a plurality of reinforcing plates, a reinforcing ring is fixedly connected to the circumferential side of the valve flap part, a sealing cavity is opened on both sides of the valve seat, a sealing part is fixedly connected to the inside of the sealing cavity, the sealing part is used to seal the reinforcing ring, and an air nozzle is installed on both sides of one end of the valve body, and the air nozzle is connected to the sealing cavity on the adjacent side.

[0008] As a further solution of the present invention: the valve flap component also includes a main valve plate fixedly connected to the valve stem, and a plurality of fastening bolts are evenly installed along the edges on both sides of the main valve plate. The reinforcement plate is installed between the fastening bolts on one side of the valve stem, and a locking plate is installed between the top ends of the fastening bolts. The inner side of the locking plate is against the two reinforcement plates on the adjacent sides.

[0009] As a further solution of the present invention: the two reinforcement rings are respectively fixedly connected to the outer arc surfaces on both sides of the main valve plate, and are in contact with the sealing members on adjacent sides.

[0010] As a further solution of the present invention: the main valve plate is fixedly connected to a limiting ring on one side close to the locking disk, the inner side of the locking disk is fitted with the outer side of the limiting ring, the two ends of the inner side of the locking disk are adapted to the side of the valve stem and arc-shaped through holes are opened, and the locking disk faces the valve seat to receive the fluid direction.

[0011] As a further solution of the present invention: the sealing member includes an inner fixing ring fixedly connected to the inner side of the sealing cavity, and the inner fixing ring is evenly installed with a plurality of steel connecting nails along the outer arc surface, and each of the steel connecting nails is fixedly connected to an outer rubber ring on the side away from the inner fixing ring, and the outer rubber ring is interference fit with the reinforcement ring.

[0012] As a further solution of the present invention: the steel connecting nails are installed on both sides of the inner fixed ring located on the same horizontal plane, the distance between two adjacent steel connecting nails is greater than the thickness of the reinforcement ring, and the steel connecting nails are respectively located on both sides of the reinforcement ring.

[0013] As a further solution of the present invention: the inner fixed ring is made of steel, and the steel connecting nails are limitedly connected between the inner fixed ring and the outer rubber ring.

[0014] As a further solution of the present invention: an air hole is provided on one side of the inner fixed ring, and the air hole is communicated with the air nozzle on the adjacent side.

[0015] Beneficial effects of the present invention:

[0016] 1. In the present invention, sealing cavities are respectively provided on both sides of the valve seat, and outer rubber rings are installed on the outer side of the sealing cavities. The outer rubber rings are in contact with the reinforcement ring on the outer side of the main valve plate of the valve disc. At the same time, two air nozzles are installed on both sides of the valve body to adapt to the sealing cavities. When in use, air is injected into the sealing cavity through the air nozzles, so that an interference fit is formed between the outer rubber ring and the reinforcement ring on the outer side of the main valve plate, thereby achieving a high sealing function of the butterfly valve. In addition, since only one side of the outer rubber ring adjacent to the reinforcement ring is exposed, the low-exposure structure can effectively extend its service life in high-temperature and high-pressure environments, avoiding its frequent replacement during use.

[0017] Furthermore, two rows of steel connecting nails are installed along the arc surface on both sides of the inner side of the outer rubber ring, and the inner sides of each steel connecting nail are fixedly connected to the inner fixed ring, and the inner fixed ring is fixedly connected to the inner side of the sealing cavity. The two rows of steel connecting nails are respectively located on both sides of the reinforcement ring. After the air nozzle injects air into the sealing cavity, the outer rubber ring is only located in the middle position of the two rows of steel connecting nails and is strongly sealed with the reinforcement ring. The side position of the outer rubber ring is in an undeformed state due to the pulling effect of the steel connecting nails. The technical advantage is that the sealing effect of the butterfly valve is achieved with the minimum deformation and less exposure. The use of the inner fixed ring and the steel connecting nails also improves the structural strength of the outer rubber ring when in use. By improving the structural strength of the outer rubber ring when in use, its service life as a sealing structure of a large-diameter butterfly valve is improved.

[0018] 2. In the present invention, multiple reinforcement plates are installed on one side of the main valve plate, and each reinforcement plate is locked by a locking disk and a fastening bolt. At the same time, a reinforcement ring is installed on the peripheral side of the main valve plate that bears greater pressure, so that the large-diameter butterfly valve can maintain the high strength of the valve disc when sealing a large-flow fluid. During the use of the valve disc, the staff can replace the reinforcement plate in time through maintenance, so as to always maintain the valve disc member from deformation. The purpose is to set the valve disc member as a split structure, cooperate with the installation of the reinforcement plate, so that it is not easy to deform, and has the ability to replace the reinforcement plate that has undergone slight deformation at any time, so as to ensure that the reinforcement ring is always in a non-deformed state, that is, to avoid the influence of the valve disc deformation on the high sealing state of the butterfly valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described below with reference to the accompanying drawings.

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a side structural diagram of the valve disc member of the present invention;

[0022] Figure 3 This is an exploded view of the valve disc member of the present invention;

[0023] Figure 4 1 is a diagram of the valve disc member of the present invention in an open state;

[0024] Figure 5 Schematic diagram of the structure of the sealing member of the present invention;

[0025] Figure 6 It is a partial cross-sectional view of the sealing member of the present invention;

[0026] Figure 7 It is a schematic diagram of the bottom structure of the present invention.

[0027] In the figure: 1. Valve body; 2. Valve seat; 3. Rotating part; 31. Control console; 32. Rotating handle; 4. Valve stem; 5. Valve disc; 51. Reinforcement plate; 52. Reinforcement ring; 53. Main valve plate; 54. Fastening bolt; 55. Locking disk; 56. Limiting ring; 6. Sealing chamber; 7. Sealing part; 71. Inner fixed ring; 72. Steel connecting pin; 73. Outer rubber ring; 74. Air hole; 8. Air nozzle. DETAILED DESCRIPTION

[0028] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0029] like Figures 1 to 7 As shown, a large-diameter butterfly valve with high sealing performance includes a valve body 1, a valve seat 2 is provided inside the valve body 1, and a rotating member 3 is installed on one side. A valve stem 4 is installed on one side of the rotating member 3. A valve flap member 5 is installed on the end of the valve stem 4 located on the valve seat 2. The valve flap member 5 is detachably installed with multiple reinforcement plates 51. A reinforcement ring 52 is fixedly connected to the side surface of the valve flap member 5. A sealing cavity 6 is provided on both sides of the valve seat 2. A sealing member 7 is fixedly connected inside the sealing cavity 6. The sealing member 7 is used to seal the reinforcement ring 52. An air nozzle 8 is installed on both sides of the bottom end of the valve body 1. The air nozzle 8 is connected to the sealing cavity 6 on the adjacent side.

[0030] It should be noted that the rotating part 3 includes a console 31 installed on the top of the valve body 1. The console 31 has a built-in worm gear, a worm is engaged on one side of the worm gear, one end of the worm gear is fixedly connected to a rotating handle 32, and the bottom end of the worm gear is fixedly connected to the valve stem 4. When the staff controls the valve, they operate the rotating handle 32 to drive the worm gear fixedly connected to it, and then the worm gear drives the worm gear inside the console 31 to rotate. The rotation of the worm gear drives the valve stem 4 to rotate, thereby completing the control of the opening and closing state of the valve. In particular, the rotation of the worm gear in the console 31 is restricted forward and backward to achieve control of the starting and ending positions of the valve opening and closing. The console 31 is disc-shaped, which is adapted to the shape of the built-in worm gear. The cylindrical structure arranged on one side of the console 31 has a built-in worm gear, and the end of the worm gear is fixedly connected to the rotating handle 32.

[0031] like Figure 2 and Figure 3 As shown, the valve disc member 5 also includes a main valve plate 53 fixedly connected to the valve stem 4. A plurality of fastening bolts 54 are evenly installed along the edges of both sides of the main valve plate 53. Four reinforcing plates 51 are installed between the fastening bolts 54 on one side of the valve stem 4. A locking plate 55 is installed between the top ends of the fastening bolts 54. The inner side of the locking plate 55 abuts against the two reinforcing plates 51 on the adjacent side.

[0032] The two reinforcing rings 52 are fixedly connected to both sides of the main valve plate 53 and fit closely with the seals 7 on the adjacent sides;

[0033] A limiting ring 56 is fixedly connected to one side of the main valve plate 53 near the locking disk 55. The inner side of the locking disk 55 is in contact with the outer side of the limiting ring 56. Arc-shaped holes are provided at both ends of the inner side of the locking disk 55 to adapt to the valve stem 4. The locking disk 55 faces the direction of the valve seat 2 to receive fluid and is used to actively bear pressure.

[0034] It should be noted that the two sides of the valve stem 4 are fixedly connected to the main valve plate 53 by welding, and four reinforcing plates 51 are stacked and installed on both sides of the main valve plate 53. Each reinforcing plate 51 is adapted to each fastening bolt 54 to open a through hole, and is locked as a whole through the screw hole at the top of the locking plate 55 with each fastening bolt 54. At the same time, a reinforcing ring 52 is welded on the side of the main valve plate 53. In particular, the reinforcing plate 51 and the reinforcing ring 52 are preferably made of low-alloy heat-resistant steel (WC9), which has the characteristics of high temperature and high pressure resistance, so that the large-diameter butterfly valve is suitable for power plants and petrochemical sites. Since the butterfly valves used in such environments are under high temperature and high pressure for a long time, the reinforcing ring 52 When it contacts the sealing member 7, it bears the greatest pressure, so special steel is used to improve its pressure resistance. At the same time, when one side of the valve disc main valve plate 53 is in a high temperature and high pressure state for a long time, it is easy to deform, so multiple detachable reinforcement plates 51 are used. The purpose is to be able to inspect the appearance of each reinforcement plate 51 during the use of the butterfly valve to determine whether the reinforcement plate 51 needs to be replaced. That is, when the split valve disc member 5 is in use, the valve disc can be maintained in a non-deformed state by timely replacing the reinforcement plate 51 without replacing the valve disc, so as to avoid the situation where the valve disc deformation causes the sealing surface deformation, thereby simplifying the maintenance difficulty and improving the stability of the valve seal.

[0035] like Figures 4 to 7 As shown, the seal 7 includes an inner fixed ring 71 fixedly connected to the inner side of the sealing cavity 6. A plurality of steel connecting nails 72 are evenly installed along the outer arc surface of the inner fixed ring 71. An outer rubber ring 73 is fixedly connected to the side of each steel connecting nail 72 away from the inner fixed ring 71. The outer rubber ring 73 is interference fit with the reinforcement ring 52.

[0036] Steel connecting nails 72 are installed on both sides of the inner fixed ring 71 on the same horizontal plane. The distance between two adjacent steel connecting nails 72 is greater than the thickness of the reinforcement ring 52, and they are respectively located on both sides of the reinforcement ring 52;

[0037] The inner fixed ring 71 is made of steel, and the steel connecting nail 72 is limitedly connected between the inner fixed ring 71 and the outer rubber ring 73;

[0038] An air hole 74 is provided on one side of the inner fixed ring 71, and the air hole 74 is connected to the air nozzle 8 on the adjacent side;

[0039] It should be noted that the width of the inner fixed ring 71 is adapted to the width of the sealing cavity 6, and the thickness of the sealing member 7 is adapted to the depth of the sealing cavity 6. After the sealing member 7 is fixed to the valve body 1, only the outer side of the outer rubber ring 73 is exposed (see FIG. Figure 4 ), its overall structure is located inside the valve body 1, so that during use, it can avoid direct contact with high-temperature and high-pressure fluids, thereby extending its service life;

[0040] The inner fixing ring 71 is preferably made of rubber, the outer rubber ring 73 is made of rubber, and the steel connecting nail 72 is made of steel. At the same time, one end of the steel connecting nail 72 passes through the inner fixing ring 71, and the other end is embedded in the outer rubber ring 73. Both ends of the steel connecting nail 72 are provided with limit ends to prevent it from being separated from the inner fixing ring 71 or the outer rubber ring 73 on both sides when subjected to air pressure. It also has the function of strengthening the overall structural strength of the seal 7. Its purpose is to maintain the deformation ability of the outer rubber ring 73 while prolonging the service life of the seal 7.

[0041] Specifically, when the rotating member 3 rotates the valve disc to fit the outer side of the reinforcing ring 52 and the outer rubber ring 73, the reinforcing ring 52 and the outer rubber ring 73 are in a transitional fit state. At this time, since the outer rubber ring 73 has not yet deformed, the butterfly valve is in a low sealing state. Subsequently, the air nozzle 8 is opened, and the air pump is connected to inject air. The air flow enters the sealing cavity 6 through the air hole 74 of the sealing member 7. The outer rubber ring 73 is deformed toward the reinforcing ring 52 side by the air pressure. Since the steel connecting nails 72 connecting the outer rubber ring 73 are respectively located on both sides of the reinforcing ring 52, the outer rubber ring Only the part of 73 located between the steel connecting nails 72 on both sides is deformed toward the reinforcement ring 52, and wraps the reinforcement ring 52 to form an interference fit, achieving a high sealing state, and then closing the air nozzle 8 to maintain this state to achieve a strong sealing effect on the butterfly valve. When the valve needs to be opened, it is only necessary to open the air nozzle 8 again to discharge the gas in the sealing cavity 6. The outer rubber ring 73 will restore its initial state under its own elasticity and the pulling action of the steel connecting nails 72, and the valve will become a low sealing state again, thereby achieving a strong seal for the valve disc and a convenient switch function.

[0042] The above is a detailed description of an embodiment of the present invention. However, the content described is only a preferred embodiment of the present invention and should not be considered to limit the scope of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A large-caliber butterfly valve with high sealing performance, comprising a valve body (1), a valve seat (2) being provided on the inner side of the valve body (1), a rotating member (3) being installed on one side, and a valve stem (4) being installed on one side of the rotating member (3), characterized in that: A valve flap member (5) is installed at one end of the valve stem (4), and the valve flap member (5) is detachably connected to a plurality of reinforcing plates (51). A reinforcing ring (52) is fixedly connected to the circumferential side of the valve flap member (5). A sealing cavity (6) is opened on both sides of the valve seat (2), and a sealing member (7) is fixedly connected inside the sealing cavity (6). The sealing member (7) is used to seal the reinforcing ring (52). An air nozzle (8) is installed on both sides of one end of the valve body (1), and the air nozzle (8) is connected to the sealing cavity (6) on the adjacent side.

2. A large-diameter butterfly valve with high sealing performance according to claim 1, characterized in that: The valve flap member (5) also includes a main valve plate (53) fixedly connected to the valve stem (4), and a plurality of fastening bolts (54) are evenly installed along the edges of both sides of the main valve plate (53). The reinforcing plate (51) is installed between the fastening bolts (54) on one side of the valve stem (4), and a locking plate (55) is installed between the top ends of the fastening bolts (54). The inner side of the locking plate (55) is against the two reinforcing plates (51) on the adjacent sides.

3. A large-diameter butterfly valve with high sealing performance according to claim 2, characterized in that: The two reinforcing rings (52) are respectively fixedly connected to the outer arc surfaces on both sides of the main valve plate (53) and are in contact with the sealing members (7) on the adjacent sides.

4. A large-diameter butterfly valve with high sealing performance according to claim 2, characterized in that: The main valve plate (53) is fixedly connected to a limiting ring (56) on one side close to the locking disk (55), and the inner side of the locking disk (55) is fitted with the outer side of the limiting ring (56). The two ends of the inner side of the locking disk (55) are adapted to the side of the valve stem (4) and are provided with arc-shaped through holes. The locking disk (55) faces the valve seat (2) to receive the fluid direction.

5. A large-diameter butterfly valve with high sealing performance according to claim 1, characterized in that: The sealing member (7) includes an inner fixed ring (71) fixedly connected to the inner side of the sealing cavity (6), and a plurality of steel connecting nails (72) are evenly installed along the outer arc surface of the inner fixed ring (71), and each of the steel connecting nails (72) is fixedly connected to an outer rubber ring (73) on a side away from the inner fixed ring (71), and the outer rubber ring (73) is interference fit with the reinforcement ring (52).

6. A large-diameter butterfly valve with high sealing performance according to claim 5, characterized in that: The steel connecting nails (72) are installed on both sides of the inner fixed ring (71) located on the same horizontal plane. The distance between two adjacent steel connecting nails (72) is greater than the thickness of the reinforcement ring (52), and the steel connecting nails (72) are respectively located on both sides of the reinforcement ring (52).

7. A large-diameter butterfly valve with high sealing performance according to claim 5, characterized in that: The inner fixed ring (71) is made of steel, and the steel connecting nail (72) is positionally connected between the inner fixed ring (71) and the outer rubber ring (73).

8. A large-diameter butterfly valve with high sealing performance according to claim 5, characterized in that: An air hole (74) is provided on one side of the inner fixed ring (71), and the air hole (74) is communicated with the air nozzle (8) on the adjacent side.

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