Butterfly valve

Abstract

The utility model relates to the technical field of valves, in particular to a butterfly valve which comprises a valve body, a butterfly plate, a valve seat, a valve rod and an executing mechanism, the valve seat is arranged on the side, close to an outlet flow channel, of the butterfly plate, an overflowing assembly is further arranged on the side, corresponding to the valve seat, of the inner wall of the valve body, and the overflowing assembly comprises a first annular hole plate. At least one first overflowing hole for a medium to pass through is formed in the first annular pore plate, and the first overflowing hole is located in the end, close to the sealing matching position of the butterfly plate and the valve seat, of the first annular pore plate. The overflowing assembly is arranged on the side, close to the outlet flow channel, of the valve seat, and the flowing speed of the medium can be reduced through the overflowing assembly; the cavitation phenomenon of a medium is restrained, damage to a pipeline is reduced, and the service life of the butterfly valve is prolonged.

Description

Technical Field

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

[0002] A butterfly valve, also known as a flap valve, is a simple regulating valve used for on / off control of low-pressure pipeline media. A butterfly valve is characterized by its closing element (valve disc or butterfly plate) being a circular plate that rotates around a valve shaft to open and close. Butterfly valves can control the flow of various types of fluids, including air, water, steam, various corrosive media, mud, oil, liquid metals, and radioactive media, primarily serving as a shut-off and throttling device in pipelines.

[0003] When the butterfly plate switches from the closed state to the open state, or when the flow rate is adjusted by a small opening angle, the flow velocity in the gap between the butterfly plate and the inner wall of the valve body increases sharply, and the local pressure drops below the saturated vapor pressure of the fluid, triggering fluid cavitation. When the bubbles in the fluid collapse, they generate a strong impact force, which damages the outlet pipeline.

[0004] The purpose of this invention is to propose corresponding solutions to the above-mentioned technical problems. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide a butterfly valve. This invention provides a flow-through component by setting a flow-through component on the side of the valve seat near the outlet flow channel. The flow-through component can reduce the flow rate of the medium, suppress the cavitation phenomenon of the medium, reduce damage to the pipeline, and improve the service life of the butterfly valve.

[0006] The technical solution adopted by this utility model is as follows: a butterfly valve, including a valve body, a butterfly plate, a valve seat, a valve stem, and an actuator. The valve body has a channel for the medium to pass through. The butterfly plate and the valve seat are sealed together in the valve body, dividing the channel into an inlet flow channel and an outlet flow channel. The actuator is installed at one end of the valve body. One end of the valve stem is connected to the butterfly plate and the other end is connected to the actuator. The valve seat is located on the side of the butterfly plate near the outlet flow channel. A flow-through component is also provided on the inner wall of the valve body corresponding to the valve seat. The flow-through component includes a first annular orifice plate. At least one first flow-through hole for the medium to pass through is opened on the first annular orifice plate. The first flow-through hole is located at the end of the first annular orifice plate near the sealing joint between the butterfly plate and the valve seat.

[0007] The flow-through assembly further includes a second annular orifice plate and a third annular orifice plate. The first annular orifice plate, the second annular orifice plate and the third annular orifice plate are arranged sequentially at intervals along the axial direction of the outlet flow channel. The distance between the first annular orifice plate and the valve seat is less than the distance between the third annular orifice plate and the valve seat. The second annular orifice plate has at least one second flow-through hole for the medium to pass through, and the third annular orifice plate has at least one third flow-through hole for the medium to pass through.

[0008] The axes of the first flow passage, the second flow passage, and the third flow passage are all collinear. The inner diameter of the second flow passage is smaller than that of the first flow passage, and the inner diameter of the third flow passage is smaller than that of the second flow passage.

[0009] The inner diameter of the second annular orifice plate is smaller than that of the first annular orifice plate, and the inner diameter of the third annular orifice plate is smaller than that of the second annular orifice plate.

[0010] The axes of the first flow passage, the second flow passage, and the third flow passage are distributed in a stepped shape, and the distance between the axis of the first flow passage and the axis of the outlet flow channel is greater than the distance between the axis of the third flow passage and the axis of the outlet flow channel.

[0011] The flow-through assembly also includes a base, an outer plate, and fasteners. The valve seat is fastened to the inner wall of the valve body via a mounting seat. The base and the outer plate are sequentially arranged on the side of the mounting seat away from the valve seat. The first annular orifice plate, the second annular orifice plate, and the third annular orifice plate are all sandwiched between the base and the outer plate. The fasteners are sequentially threaded to the outer plate, the base, the mounting seat, and the inner wall of the valve body.

[0012] The flow-through assembly also includes a connecting block and a spacer block. The connecting block is sandwiched between the base and the outer plate and passes through the first annular perforated plate, the second annular perforated plate and the third annular perforated plate in sequence. Spacer blocks are distributed between the first annular perforated plate and the second annular perforated plate and between the second annular perforated plate and the third annular perforated plate.

[0013] The beneficial effects of this utility model are as follows: By setting a flow-through component, namely a first annular orifice plate and a first flow-through hole on the first annular orifice plate, on the side of the valve seat near the outlet flow channel, the medium can reduce its flow velocity through the first flow-through hole, suppress the cavitation phenomenon of the medium, reduce damage to the pipeline, and improve the service life of the butterfly valve. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of this utility model.

[0015] Figure 1 This is a schematic diagram of the butterfly valve of this utility model;

[0016] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle;

[0017] Figure 3 This is a partially enlarged schematic diagram of another embodiment;

[0018] In the figure, 1-valve body, 2-butterfly plate, 3-valve seat, 4-valve stem, 5-actuator, 6-inlet flow channel, 7-outlet flow channel, 8-first annular orifice plate, 9-first flow hole, 10-second annular orifice plate, 11-third annular orifice plate, 12-second flow hole, 13-third flow hole, 14-base, 15-outer plate, 16-fastener, 17-mounting seat, 18-connecting block, 19-spacer block. Detailed Implementation

[0019] To make the objectives, technical solutions and advantages of this utility model clearer, the utility model will be described in further detail below with reference to the accompanying drawings.

[0020] It should be noted that all uses of "first" and "second" in the embodiments of this utility model are for the purpose of distinguishing two entities or parameters with the same name but different names. It is clear that "first" and "second" are only for the convenience of expression and should not be construed as limiting the embodiments of this utility model. Subsequent embodiments will not explain this in detail.

[0021] The directional and positional terms used in this utility model, such as "up," "down," "front," "back," "left," "right," "inner," "outer," "top," "bottom," and "side," are merely for reference to the accompanying drawings. Therefore, the directional and positional terms used are for the purpose of explaining and understanding this utility model, and not for limiting the scope of protection of this utility model.

[0022] like Figures 1 to 3As shown in the figure, a butterfly valve is provided in one embodiment of the present invention. The butterfly valve includes a valve body 1, a butterfly plate 2, a valve seat 3, a valve stem 4, and an actuator 5. The valve body 1 has a channel for the medium to pass through. The butterfly plate 2 and the valve seat 3 are sealed together in the valve body 1, dividing the channel into an inlet flow channel 6 and an outlet flow channel 7. The actuator 5 is installed at one end of the valve body 1. One end of the valve stem 4 is connected to the butterfly plate 2 and the other end is connected to the actuator 5. The valve seat 3 is located on the side of the butterfly plate 2 near the outlet flow channel 7. A flow-through component is also provided on the inner wall of the valve body 1 on the side corresponding to the valve seat 3. The flow-through component includes a first annular orifice plate 8. The first annular orifice plate 8 has at least one first flow-through hole 9 for the medium to pass through. The first flow-through hole 9 is located at the end of the first annular orifice plate 8 near the sealing joint between the butterfly plate 2 and the valve seat 3.

[0023] The beneficial effects of this design are as follows: By setting a flow-through component, namely a first annular orifice plate and a first flow-through hole on the first annular orifice plate, on the side of the valve seat near the outlet flow channel, the medium can reduce its flow velocity by passing through the first flow-through hole, suppress cavitation, reduce damage to the pipeline, and improve the service life of the butterfly valve. The first flow-through hole is located at the end of the first annular orifice plate near the sealing fit between the butterfly plate and the valve seat, so that the medium can also be decelerated by passing through the first flow-through hole when the butterfly plate is opened at a small angle, ensuring the stable realization of the deceleration effect.

[0024] Further, the flow-through assembly includes a second annular orifice plate 10 and a third annular orifice plate 11. The first annular orifice plate 8, the second annular orifice plate 10, and the third annular orifice plate 11 are arranged sequentially at intervals along the axial direction of the outlet flow channel 7. The distance between the first annular orifice plate 8 and the valve seat 3 is less than the distance between the third annular orifice plate 11 and the valve seat 3. The second annular orifice plate 10 has at least one second flow-through hole 12 for the medium to pass through, and the third annular orifice plate 11 has at least one third flow-through hole 13 for the medium to pass through.

[0025] The beneficial effects of this setup are as follows: multi-stage deceleration is achieved through the spaced second and third annular orifice plates. The first flow hole forms the initial pressure recovery, and the space between them allows the fluid to diffuse and depressurize again. Multi-stage depressurization effectively eliminates local low-pressure areas and further enhances the ability to suppress cavitation phenomena in the fluid medium.

[0026] Further configuration: the axes of the first flow passage 9, the second flow passage 12, and the third flow passage 13 are all collinear; the inner diameter of the second flow passage 12 is smaller than that of the first flow passage 9; and the inner diameter of the third flow passage 13 is smaller than that of the second flow passage 12.

[0027] The beneficial effects of this configuration are as follows: In one embodiment, the first, second, and third flow holes are arranged in a collinear position with their axes collinear, and the inner diameter of the holes decreases step by step. The smaller flow holes further slow down the flow velocity and further enhance the suppression of cavitation phenomena in the fluid medium.

[0028] Further configuration: the inner diameter of the second annular perforated plate 10 is smaller than that of the first annular perforated plate 8, and the inner diameter of the third annular perforated plate 11 is smaller than that of the second annular perforated plate 10.

[0029] The beneficial effects of this setup are as follows: the positioning of the three annular orifice plates ensures that the fluid can flow through the orifices without obstructing the opening and closing of the butterfly plate.

[0030] Furthermore, the axes of the first flow passage 9, the second flow passage 12, and the third flow passage 13 are distributed in a stepped shape, and the distance between the axis of the first flow passage 9 and the axis of the outlet flow channel 7 is greater than the distance between the axis of the third flow passage 13 and the axis of the outlet flow channel 7.

[0031] The beneficial effects of this configuration are as follows: In another embodiment, the three flow holes are arranged in a stepped shape with their relative positions distributed. The staggered arrangement disrupts the laminar flow state of the fluid and induces turbulence. Turbulence can disperse the fluid's kinetic energy and suppress cavitation. Furthermore, the staggered arrangement of the flow holes can cause high-speed fluid to impact the non-porous areas of the annular orifice plate, generating a braking effect, further reducing the flow velocity and guiding the fluid to diffuse towards the center, thus avoiding cavitation on the inner wall of the valve body.

[0032] Further, the flow assembly also includes a base 14, an outer plate 15, and fasteners 16. The valve seat 3 is fastened to the inner wall of the valve body 1 via a mounting base 17. The base 14 and the outer plate 15 are sequentially arranged on the side of the mounting base 17 away from the valve seat 3. The first annular orifice plate 8, the second annular orifice plate 10, and the third annular orifice plate 11 are all sandwiched between the base 14 and the outer plate 15. The fasteners 16 are sequentially threaded to the outer plate 15, the base 14, the mounting base 17, and the inner wall of the valve body 1.

[0033] The advantages of this design are as follows: the modular disassembly and assembly structure clamps and fixes the annular orifice plate through the base and outer plate, and the fasteners are also connected to the mounting base of the fixed valve seat. The structure is more compact and simplified, and it is also convenient for disassembly and maintenance. The fasteners use bolts of existing technology.

[0034] Furthermore, the flow-through assembly also includes a connecting block 18 and a spacer block 19. The connecting block 18 is sandwiched between the base 14 and the outer plate 15, and passes through the first annular perforated plate 8, the second annular perforated plate 10 and the third annular perforated plate 11 in sequence. Spacer blocks 19 are distributed between the first annular perforated plate 8 and the second annular perforated plate 10 and between the second annular perforated plate 10 and the third annular perforated plate 11.

[0035] The beneficial effects of this setup are as follows: the spacer blocks can ensure the spacing between each annular perforated plate, the number of annular perforated plates can also be adjusted, the connecting blocks can ensure the firmness of each annular perforated plate installation, and can also ensure the precise staggered positioning of each annular perforated plate, avoiding assembly errors.

[0036] The above-disclosed embodiments are merely preferred embodiments of the present utility model and should not be construed as limiting the scope of the present utility model. Therefore, any equivalent variations made in accordance with the claims of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A butterfly valve, comprising a valve body (1), a butterfly plate (2), a valve seat (3), a valve stem (4), and an actuator (5), wherein the valve body (1) has an internal channel for the passage of a medium, the butterfly plate (2) and the valve seat (3) are sealed together within the valve body (1) to divide the channel into an inlet flow channel (6) and an outlet flow channel (7), the actuator (5) is installed at one end of the valve body (1), and one end of the valve stem (4) is connected to the butterfly plate (2) and the other end is connected to the actuator (5), characterized in that: The valve seat (3) is located on the side of the butterfly plate (2) near the outlet flow channel (7). The inner wall of the valve body (1) is also provided with a flow-through component on the side of the valve seat (3). The flow-through component includes a first annular orifice plate (8). The first annular orifice plate (8) has at least one first flow-through hole (9) for the medium to pass through. The first flow-through hole (9) is located at one end of the first annular orifice plate (8) near the sealing fit between the butterfly plate (2) and the valve seat (3).

2. The butterfly valve of claim 1, wherein: The flow-through assembly further includes a second annular orifice plate (10) and a third annular orifice plate (11). The first annular orifice plate (8), the second annular orifice plate (10), and the third annular orifice plate (11) are arranged sequentially at intervals along the axial direction of the outlet flow channel (7). The distance between the first annular orifice plate (8) and the valve seat (3) is less than the distance between the third annular orifice plate (11) and the valve seat (3). The second annular orifice plate (10) has at least one second flow-through hole (12) for the medium to pass through, and the third annular orifice plate (11) has at least one third flow-through hole (13) for the medium to pass through.

3. The butterfly valve of claim 2, wherein: The axes of the first flow passage (9), the second flow passage (12) and the third flow passage (13) are all collinear. The inner diameter of the second flow passage (12) is smaller than that of the first flow passage (9), and the inner diameter of the third flow passage (13) is smaller than that of the second flow passage (12).

4. The butterfly valve of claim 2, wherein: The inner diameter of the second annular perforated plate (10) is smaller than that of the first annular perforated plate (8), and the inner diameter of the third annular perforated plate (11) is smaller than that of the second annular perforated plate (10).

5. The butterfly valve of claim 4, wherein: The axes of the first flow passage (9), the second flow passage (12) and the third flow passage (13) are distributed in a stepped shape. The distance between the axis of the first flow passage (9) and the axis of the outlet flow channel (7) is greater than the distance between the axis of the third flow passage (13) and the axis of the outlet flow channel (7).

6. The butterfly valve of claim 2, wherein: The flow-through assembly also includes a base (14), an outer plate (15), and fasteners (16). The valve seat (3) is fastened to the inner wall of the valve body (1) by a mounting seat (17). The base (14) and the outer plate (15) are sequentially arranged on the side of the mounting seat (17) away from the valve seat (3). The first annular orifice plate (8), the second annular orifice plate (10), and the third annular orifice plate (11) are all sandwiched between the base (14) and the outer plate (15). The fasteners (16) are sequentially threaded to the outer plate (15), the base (14), the mounting seat (17), and the inner wall of the valve body (1).

7. The butterfly valve of claim 6, wherein: The flow-through assembly also includes a connecting block (18) and a spacer block (19). The connecting block (18) is sandwiched between the base (14) and the outer plate (15) and passes through the first annular perforated plate (8), the second annular perforated plate (10) and the third annular perforated plate (11) in sequence. Spacer blocks (19) are distributed between the first annular perforated plate (8) and the second annular perforated plate (10) and between the second annular perforated plate (10) and the third annular perforated plate (11).

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