Bidirectional three-eccentric center butterfly valve

Abstract

The utility model relates to the technical field of butterfly valves, in particular to a two-way three-eccentric center butterfly valve which comprises a valve body and a fixing cylinder, the fixing cylinder is fixedly connected to the upper end face of the valve body, an adjusting mechanism is arranged in the valve body, and the adjusting mechanism comprises a rotating rod, a rotating disc, a sealing cavity, a U-shaped rod and a magnetic block. The rotating rod is rotationally connected to the side wall of the fixed cylinder, the rotating disc is fixedly connected to the end, close to the fixed cylinder, of the rotating rod, and the multiple sealing cavities are installed on the side wall of the rotating disc in an annular array mode. The magnetic block, the copper sheet and other structures are matched, a high-pressure medium conveyed by a pipeline is used for driving the paddle to rotate, and the driving disc and other structures are matched, so that the magnetic block rotates at a high speed, eddy current heating is generated in the copper sheet and transmitted into the valve element through the valve rod, the valve element is prevented from shrinking and deforming due to low temperature, and the sealing shape is guaranteed; and the butterfly valve can keep good sealing performance under a low-temperature medium.

Description

Technical Field

[0001] This utility model relates to the field of butterfly valve technology, and in particular to a bidirectional triple eccentric butterfly valve. Background Technology

[0002] Currently, the triple eccentric butterfly valve is a metal hard-seal butterfly valve with three geometrically eccentric structures. It utilizes torque sealing and is mainly used in large high-pressure pipelines. It has good adaptability to high-temperature, high-pressure and bidirectional pressure conditions.

[0003] Triple-eccentric butterfly valves rely on hard metal seals. When transporting cryogenic media, the sealing performance is easily reduced due to the contraction of the metal at low temperatures, resulting in leakage. Therefore, they cannot transport cryogenic media such as natural gas. Utility Model Content

[0004] The purpose of this invention is to address the following shortcomings in the prior art by proposing a bidirectional triple-eccentric butterfly valve.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A bidirectional triple-eccentric butterfly valve includes a valve body and a fixed cylinder, the fixed cylinder being fixedly connected to the upper end face of the valve body; the valve body is provided with an adjustment mechanism, the adjustment mechanism including a rotating rod, a turntable, a sealing cavity, a U-shaped rod, and a magnetic block, the rotating rod being rotatably connected to the side wall of the fixed cylinder, the turntable being fixedly connected to one end of the rotating rod near the fixed cylinder, a plurality of sealing cavities being respectively arranged in a ring array on the side wall of the turntable, a plurality of U-shaped rods being respectively slidably connected to the side wall of the sealing cavity, a plurality of U-shaped rods being respectively slidably connected to the turntable, and a plurality of magnetic blocks being respectively fixedly connected to one end of the U-shaped rod.

[0007] Preferably, a C-shaped frame is fixedly connected to the upper end face of the valve body, a slide rod is slidably connected to the upper end face of the C-shaped frame, a drive disc is fixedly connected to the end of the rotating rod away from the turntable, and a connecting rod is hinged between the drive disc and the slide rod.

[0008] Preferably, a fixing ring is fixedly connected to the inner side wall of the valve body, a straight rod is rotatably connected to the side wall of the fixing ring, a paddle is fixedly connected to the outer surface of the straight rod, a plurality of first magnetic plates are fixedly connected to the straight rod through a plurality of connecting rods, and a second magnetic plate is fixedly connected to the end of the slide rod away from the connecting rod.

[0009] Preferably, a sealing plate is slidably connected to the side wall of the sealed cavity, and the sealing plate is fixedly connected to the end of the U-shaped rod away from the magnetic block.

[0010] Preferably, a valve stem is rotatably connected to the side wall of the fixed cylinder, and a copper sheet is fixedly connected to the outer surface of the valve stem.

[0011] Preferably, a return spring is fixedly connected between the second magnetic sheet and the C-shaped frame, and a compression spring is fixedly connected between the sealing plate and the sealing cavity.

[0012] Compared with the prior art, the beneficial effects of this utility model are:

[0013] 1. Through the combination of magnetic blocks, copper sheets, and other structures, the high-pressure medium transported through the pipeline drives the paddle to rotate. In conjunction with the drive disc and other structures, the high-speed rotation of the magnetic blocks generates eddy currents and heat in the copper sheets. This heat is transmitted to the valve core through the valve stem, preventing the valve core from shrinking and deforming due to low temperature, thus ensuring a good seal. This allows the butterfly valve to maintain good sealing performance under low-temperature media.

[0014] 2. Through the cooperation of structures such as the sealing cavity and U-shaped rod, the gas in the sealing cavity senses the temperature change inside the pipe cylinder, and pushes the magnetic block to adjust the distance between it and the copper sheet, so that the heat generation is maintained in a suitable range, avoiding excessive temperature and aging of the packing, thus ensuring the sealing performance of the device.

[0015] 3. Through the cooperation of structures such as fixed rings and blades, the high-pressure medium itself is used as the power to drive the device, eliminating the need for an additional drive unit, which is more energy-efficient and environmentally friendly. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the fixing ring structure of a bidirectional triple eccentric butterfly valve proposed in this utility model;

[0017] Figure 2 A schematic diagram of the C-shaped frame structure of a bidirectional triple eccentric butterfly valve proposed in this utility model;

[0018] Figure 3 A schematic diagram of the copper sheet structure of a bidirectional triple eccentric butterfly valve proposed in this utility model;

[0019] Figure 4 This is a schematic diagram of the sealing plate structure of a bidirectional triple eccentric butterfly valve proposed in this utility model.

[0020] In the diagram: 1 Valve body, 2 Fixed cylinder, 3 Rotating rod, 4 Compression spring, 5 Turntable, 6 Sealing cavity, 7 U-shaped rod, 8 Magnetic block, 9 C-shaped frame, 10 Slide rod, 11 Drive disc, 12 Connecting rod, 13 Fixed ring, 14 Straight rod, 15 Paddle, 16 First magnetic plate, 17 Second magnetic plate, 18 Sealing plate, 19 Valve stem, 20 Copper plate, 21 Return spring. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0022] Reference Figures 1-4 A bidirectional triple eccentric butterfly valve includes a valve body 1 and a fixed cylinder 2. The fixed cylinder 2 is fixedly connected to the upper end face of the valve body 1. An adjustment mechanism is provided inside the valve body 1. The adjustment mechanism includes a rotating rod 3, a turntable 5, a sealing cavity 6, a U-shaped rod 7, and a magnetic block 8. The rotating rod 3 is rotatably connected to the side wall of the fixed cylinder 2. The turntable 5 is fixedly connected to one end of the rotating rod 3 near the fixed cylinder 2. Multiple sealing cavities 6 are respectively arranged in a ring array and installed on the side wall of the turntable 5. Multiple U-shaped rods 7 are respectively slidably connected to the side wall of the sealing cavity 6. The U-shaped rods 7 and the sealing cavity 6 are not sealed. Multiple U-shaped rods 7 are respectively slidably connected to the turntable 5. Multiple magnetic blocks 8 are respectively fixedly connected to one end of the U-shaped rod 7.

[0023] A C-shaped frame 9 is fixedly connected to the upper end face of the valve body 1. A slide rod 10 is slidably connected to the upper end face of the C-shaped frame 9. A drive disc 11 is fixedly connected to the end of the rotating rod 3 away from the turntable 5. A connecting rod 12 is hinged between the drive disc 11 and the slide rod 10.

[0024] A fixing ring 13 is fixedly connected to the inner wall of the valve body 1. The fixing ring 13 is hollowed out so as not to affect the normal flow of the medium. A straight rod 14 is rotatably connected to the side wall of the fixing ring 13. A paddle 15 is fixedly connected to the outer surface of the straight rod 14. Multiple first magnetic pieces 16 are fixedly connected to the straight rod 14 through multiple connecting rods. A second magnetic piece 17 is fixedly connected to the end of the slide rod 10 away from the connecting rod 12. A return spring 21 is fixedly connected between the second magnetic piece 17 and the C-shaped frame 9. The first magnetic piece 16 and the second magnetic piece 17 have the same magnetism when they are close to each other, which generates a repulsive force. The first magnetic piece 16 and the second magnetic piece 17 are both samarium cobalt magnets, which can still maintain their magnetism in extremely low temperature environments such as liquid nitrogen.

[0025] A sealing plate 18 is slidably connected to the side wall of the sealing cavity 6. A compression spring 4 is fixedly connected between the sealing plate 18 and the sealing cavity 6. The sealing plate 18 is fixedly connected to the end of the U-shaped rod 7 away from the magnetic block 8. The sealing cavity 6 is filled with compressed gas, which is sensitive to temperature changes.

[0026] A valve stem 19 is rotatably connected to the side wall of the fixed cylinder 2. The upper part of the fixed cylinder 2 and the valve stem 19 are both made of heat insulation material, so heat will not be transferred from the valve stem 19 and the fixed cylinder 2 to the outside, reducing heat loss. A copper sheet 20 is fixedly connected to the outer surface of the valve stem 19. The valve stem 19 and the valve core have good thermal conductivity. The equipment is used in normally open environments and is not suitable for normally closed working states.

[0027] When this invention is used to transport a cryogenic medium, the high-pressure cryogenic medium drives the paddle 15 to rotate the straight rod 14. The straight rod 14 drives multiple connecting rods and multiple first magnetic pieces 16 to rotate. When the first magnetic piece 16 approaches the second magnetic piece 17, because the two have the same magnetism, the first magnetic piece 16 repels the second magnetic piece 17. The second magnetic piece 17 drives the slide rod 10 and connecting rod 12 to move upward, compressing the return spring 21 and the connecting rod 12 to make the drive disk 11 rotate half a turn. When the first magnetic piece 16 moves away from the second magnetic piece 17, the repulsive force on the second magnetic piece 17 disappears. Under the elastic force of the return spring 21, the slide rod 10 drives the connecting rod 12 to drive the drive disk 11 to continue rotating half a turn. As the paddle 15 continues to rotate... The drive disc 11 continuously drives the rotating rod 3 and the rotating disc 5 to rotate. The rotating disc 5 drives multiple sealing chambers 6 to rotate. The sealing chambers 6 drive the U-shaped rod 7 and the magnetic block 8 to rotate. The rotation of the magnetic block 8 generates eddy currents and heats up in the copper sheet 20. The heat is transferred to the valve stem 19 and the valve core to prevent them from shrinking due to low temperature. The heat causes the temperature inside the fixed cylinder 2 to rise, causing the gas in the sealing chamber 6 to expand due to heat. This causes the sealing plate 18 and the U-shaped rod 7 to move and compress the compression spring 4, moving the magnetic block 8 away from the copper sheet 20, thereby reducing the heat generation. Conversely, when the temperature drops, the gas contracts. Under the elastic force of the compression spring 4, the magnetic block 8 moves closer to the copper sheet 20, and the temperature rises. This prevents the packing from aging due to excessive temperature and causing leakage, and keeps the temperature within a reasonable range.

[0028] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A bidirectional triple eccentric butterfly valve, comprising a valve body (1) and a fixed cylinder (2), characterized in that, The fixed cylinder (2) is fixedly connected to the upper end face of the valve body (1); the valve body (1) is provided with an adjustment mechanism, which includes a rotating rod (3), a turntable (5), a sealing cavity (6), a U-shaped rod (7), and a magnetic block (8). The rotating rod (3) is rotatably connected to the side wall of the fixed cylinder (2), the turntable (5) is fixedly connected to one end of the rotating rod (3) near the fixed cylinder (2), a plurality of sealing cavities (6) are respectively arranged in a ring array on the side wall of the turntable (5), a plurality of U-shaped rods (7) are respectively slidably connected to the side wall of the sealing cavity (6), a plurality of U-shaped rods (7) are respectively slidably connected to the turntable (5), and a plurality of magnetic blocks (8) are respectively fixedly connected to one end of the U-shaped rod (7).

2. The bidirectional triple eccentric butterfly valve according to claim 1, characterized in that, A C-shaped frame (9) is fixedly connected to the upper end face of the valve body (1), and a slide rod (10) is slidably connected to the upper end face of the C-shaped frame (9). A drive disc (11) is fixedly connected to the end of the rotating rod (3) away from the turntable (5), and a connecting rod (12) is hinged between the drive disc (11) and the slide rod (10).

3. A bidirectional triple-eccentric butterfly valve according to claim 2, characterized in that, A fixing ring (13) is fixedly connected to the inner side wall of the valve body (1), a straight rod (14) is rotatably connected to the side wall of the fixing ring (13), a paddle (15) is fixedly connected to the outer surface of the straight rod (14), and a plurality of first magnetic pieces (16) are fixedly connected to the straight rod (14) through a plurality of connecting rods respectively. A second magnetic piece (17) is fixedly connected to the end of the slide rod (10) away from the connecting rod (12).

4. A bidirectional triple-eccentric butterfly valve according to claim 3, characterized in that, A sealing plate (18) is slidably connected to the side wall of the sealing cavity (6), and the sealing plate (18) is fixedly connected to the end of the U-shaped rod (7) away from the magnetic block (8).

5. A bidirectional triple-eccentric butterfly valve according to claim 1, characterized in that, A valve stem (19) is rotatably connected to the side wall of the fixed cylinder (2), and a copper sheet (20) is fixedly connected to the outer surface of the valve stem (19).

6. A bidirectional triple-eccentric butterfly valve according to claim 4, characterized in that, A reset spring (21) is fixedly connected between the second magnetic sheet (17) and the C-shaped frame (9), and a compression spring (4) is fixedly connected between the sealing plate (18) and the sealing cavity (6).

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