Butterfly valve and vacuum tube

Abstract

A valve rod in the butterfly valve comprises an outer valve rod body and an inner valve rod body, the inner valve rod body is arranged in the outer valve rod body and connected with a driving mechanism so as to be driven by the driving mechanism to rotate relative to the outer valve rod body, and a plurality of driving pieces capable of moving in the radial direction of the inner valve rod body are arranged in the inner valve rod body. A plurality of retainers capable of moving along the radial direction of the outer valve rod are arranged in the outer valve rod; a butterfly plate in the butterfly valve is formed by splicing a plurality of sub-plates capable of rotating independently, and the sub-plates correspond to different driving pieces and different stopping pieces. The driving part extends out of the outer valve rod under the driving of the power mechanism and further drives the corresponding sub-plate to rotate along with the rotation of the inner valve rod, so that the sub-plate is changed from a sealing position to an opening position or changed from the opening position to the sealing position; and the retainer extends out of the outer valve rod under the driving of the power mechanism so as to stop the corresponding sub-plate, so that the sub-plate is kept at the sealing position. The daughter plates are driven by the different driving pieces to rotate independently under the driving of the inner valve rod, so that opening and closing of different parts of the inner cavity of the valve body are achieved, and the more accurate pressure control effect is achieved.

Description

Technical Field

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

[0002] Butterfly valves are commonly used in fluid pipelines to control the flow of fluid. A butterfly valve consists of a valve body, a disc housed within the valve body, and a valve shaft. The disc is circular and connected to the valve shaft, which is connected to a stepper motor. Driven by the stepper motor, the disc rotates around the valve shaft to open or close the valve. When the disc is parallel to the pipeline axis, the butterfly valve is fully open, allowing fluid to flow freely through the valve body. When the disc rotates to be perpendicular to the pipeline axis, the butterfly valve is fully closed, preventing fluid flow. Generally, the flow rate and pressure of the fluid can be adjusted by controlling the rotation angle of the disc. However, in practice, the limited precision of the stepper motor restricts the butterfly valve's ability to regulate and control pressure, making precise pressure control impossible.

[0003] Therefore, it is necessary to develop a butterfly valve with high pressure control performance. Utility Model Content

[0004] The purpose of this invention is to provide a butterfly valve and a vacuum tube with the butterfly valve, which solves the problem that the pressure control capability of the butterfly valve is affected by the accuracy of the stepper motor, making it impossible to accurately control the pressure.

[0005] This utility model provides a butterfly valve, including a drive mechanism, a valve body, a disc placed in the valve body, and a valve stem.

[0006] The valve stem includes an outer valve stem and an inner valve stem. The inner valve stem is placed inside the outer valve stem and connected to the drive mechanism so as to rotate relative to the outer valve stem under the drive of the drive mechanism. The outer valve stem is fixedly connected to the valve body.

[0007] The disc is connected to the valve stem and is composed of multiple independently rotatable sub-plates. Each sub-plate rotates independently around the valve stem as the rotation center and can be positioned in a sealed position or an open position. The sealed position is such that part of the inner cavity of the valve body is cut off, and the open position is such that part of the inner cavity of the valve body is open.

[0008] as well as,

[0009] The control assembly for driving the position state changes of each sub-plate includes a power mechanism, a plurality of driving members disposed in the inner valve stem and capable of moving radially along the inner valve stem, and a plurality of stop members disposed in the outer valve stem and capable of moving radially along the outer valve stem. The outer valve stem is provided with a plurality of through holes, each of which allows one of the driving members to pass through.

[0010] Each sub-plate corresponds to a different driving member and a different stopping member. The driving member extends the outer valve stem from the through hole under the drive of the power mechanism, and drives the corresponding sub-plate to rotate as it rotates with the inner valve stem, so that the sub-plate rotates from the sealed position to the open position, or from the open position to the sealed position. The stopping member extends the outer valve stem under the drive of the power mechanism to stop the corresponding sub-plate and keep the sub-plate in the sealed position.

[0011] Optionally, all the sub-plates are arranged sequentially from the inside to the outside along the radial direction of the disc, and all the sub-plates have the same center.

[0012] Optionally, the power mechanism is a pneumatic source, and both the inner valve stem and the outer valve stem are provided with multiple channels. Each channel is provided with a driving component or a stop component at its end. The pneumatic source is connected to the channel to drive the driving component or the stop component to move radially through pneumatic pressure.

[0013] Optionally, the power mechanism is a hydraulic source, and both the inner valve stem and the outer valve stem are provided with multiple channels. Each channel is provided with a driving component or a stop component at its end. The hydraulic source is connected to the channel to drive the driving component or the stop component to move radially by hydraulic pressure.

[0014] Optionally, the power mechanism includes a power source and multiple transmission rods movably disposed in the inner valve stem and the outer valve stem. The transmission rods are connected to one of the driving members or one of the stop members, and the power source drives the driving member or the stop member to perform radial movement through the transmission rods.

[0015] Optionally, the power source is a telescopic cylinder, a motor, or a spring mechanism.

[0016] Optionally, in the circumferential direction of the outer valve stem, the length of the through hole is less than one-quarter of the circumference of the outer valve stem.

[0017] Optionally, each of the contact points between adjacent subplates has a sealing portion.

[0018] Optionally, the outer periphery of the sub-plate has a toothed structure, and adjacent sub-plates mesh with each other through the toothed structure.

[0019] This utility model also provides a vacuum tube, which includes a tube body and a butterfly valve as described in any of the preceding claims disposed on the tube body.

[0020] The butterfly valve and vacuum tube of this utility model have the following beneficial effects:

[0021] The disc valve is composed of multiple sub-plates, each of which rotates independently under the drive of the inner valve stem by different driving components. This allows for the opening and closing of different parts of the valve body cavity, achieving a more precise pressure control effect. In addition, each sub-plate is driven by an independent power mechanism and driving components, preventing jamming that could cause the butterfly valve to malfunction. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of a butterfly valve according to the present invention;

[0023] Figure 2 This is a diagram illustrating one embodiment of the valve stem of this utility model;

[0024] Figure 3 This is a partial sectional view of the butterfly valve of this utility model.

[0025] Reference numerals: 1, drive mechanism; 2, disc plate; 201, 202, 203, sub-plates; 3, valve stem;

[0026] 31, Inner valve stem; 32, Outer valve stem; 33, Driving component; 34, Stop component; 35, Through hole;

[0027] 401, 402, channels; 4, valve body. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model. Unless otherwise defined, the technical or scientific terms used herein should have the ordinary meaning understood by those skilled in the art to which this utility model pertains. The terms "comprising" and similar expressions used herein mean that the element or object preceding the word covers the element or object listed following the word and its equivalents, but does not exclude other elements or objects.

[0029] This utility model provides a butterfly valve, such as Figures 1 to 3As shown, this embodiment includes a drive mechanism 1, a valve body 4, a disc 2 placed in the valve body 4, and a valve stem 3. The valve stem 3 includes an outer valve stem 32 and an inner valve stem 31. The inner valve stem 31 is placed in the outer valve stem 32 and connected to the drive mechanism 1 so that it can rotate relative to the outer valve stem 32 under the drive of the drive mechanism 1. The outer valve stem 32 is fixedly connected to the valve body. The disc 2 is connected to the valve stem 3 and is composed of multiple independently rotatable sub-plates 201, 202, and 203. Each sub-plate is sleeved on the outer valve stem, that is, each sub-plate has a sleeve hole, and the sleeve holes are connected to form a through cavity of the disc 2. The valve stem is placed in the through cavity. Each sub-plate 201, 202, and 203 rotates independently about the valve stem 3 and can be positioned in a sealed position or an open position. The sealed position is such that part of the inner cavity of the valve body is cut off, and the open position is such that part of the inner cavity of the valve body is open.

[0030] The control assembly for driving each subplate includes a power mechanism, multiple drive members 33 disposed in the inner valve stem 31 and capable of radial movement along the inner valve stem 31, and multiple stop members 34 disposed in the outer valve stem 32 and capable of radial movement along the outer valve stem 32. The outer valve stem 32 is provided with multiple through holes 35, each through hole 35 allowing one drive member 33 to pass through. Each subplate 201, 202, and 203 corresponds to a different drive member 33 and a different stop member 35. Driven by the power mechanism, the drive member 33 extends out of the through hole 35 from the outer valve stem 32, thereby driving the corresponding subplate to rotate when rotating with the inner valve stem 31. When not driven by the power mechanism, the drive member 33 is only located in the inner valve stem. The stop member 34 extends out of the outer valve stem 32 under the drive of the power mechanism to stop the corresponding subplate. When not driven by the power mechanism, the stop member 34 is only located in the outer valve stem.

[0031] In this embodiment, the disc 2 is composed of multiple sub-plates, and each sub-plate is independently rotated by different driving components 33 driven by the inner valve stem 31. This enables the opening and closing of different parts of the valve body cavity, achieving a more precise pressure control effect. When each sub-plate does not need to rotate, its corresponding driving component is located in the inner valve stem, meaning that even if the inner valve stem rotates, the sub-plate will not rotate accordingly. In addition, each sub-plate is driven by an independent power mechanism and driving component, avoiding jamming that would prevent the butterfly valve from working properly. The disc of this invention is divided into independent sub-plates, each of which is independently driven to rotate and remain stationary. Specifically, the drive mechanism 1 drives the inner valve stem 31 to rotate, while the power mechanism causes the drive member 33 to extend out of the outer valve stem 32 and abut against the sub-plate. In this embodiment, the abutment means that the drive member 33 can transmit the driving force to the sub-plate to achieve linkage. The specific form of abutment is not limited here, such as surface-to-surface contact between the drive member and the sub-plate, or a groove is provided on the sub-plate so that part of the drive member can extend into the groove, thereby causing the sub-plate to rotate with the inner valve stem 31, causing the sub-plate to move from the sealed position to the open position, or from the open position to the sealed position, so as to open or cut off the inner cavity of the corresponding valve body part. That is, by setting the number of sub-plates, the valve can be opened or closed. The inner cavity of the valve body is divided into multiple different regions, allowing for pressure control of varying precision. The sub-plate can be held stationary in a sealed position by a stop, ensuring that the corresponding drive component returns to the inner valve stem. This prevents the inner valve stem from rotating, thus avoiding rotation of the sub-plate in the sealed position. Furthermore, the stop also protects the sub-plate from the impact force generated by fluid flow within the valve body, preventing it from being impacted and rotating, which could lead to failure. Additionally, because multiple sub-plates are driven by independent drive components, even if the outermost sub-plate cannot rotate due to frictional particles between it and the inner wall of the cavity, the other sub-plates can still be driven open without restriction. This prevents the butterfly valve from jamming due to frictional particles between the disc and the valve body. In this embodiment, the drive mechanism 1 can be a motor.

[0032] As a specific embodiment, see Figure 1 and Figure 3As shown, all sub-plates 201, 202, and 203 are arranged sequentially from the inside to the outside along the radial direction of the disc 2, and all sub-plates have the same center. In this embodiment, the above-mentioned sub-plates can be formed by dividing the disc into rings, that is, by concentric circles. That is, the sub-plate 203 located at the center of the disc is circular, and the other sub-plates 201 and 202 are ring-shaped. All sub-plate rings are connected sequentially from the inside to the outside along the radial direction of the disc. Specifically, the highest pressure control accuracy of the butterfly valve is related to the area ratio of the central sub-plate to the disc. The accuracy of the butterfly valve can be adjusted by adjusting the area of ​​the sub-plate. When the disc is a single piece and not divided, the butterfly valve opening is 0-1000. When the opening is 0, it is completely closed, that is, the disc is in a position perpendicular to the axis of the valve body cavity, which is referred to as the sealed position in this specification; when the opening is 1000, it is completely open, that is, the disc is in a position parallel to the axis of the valve body cavity, which is referred to as the open position in this specification. In this embodiment, the disc is radially divided into multiple sub-plates, as shown in the figure, consisting of three sub-plates: a central sub-plate 203, which is circular; and the remaining sub-plates 201 and 202, which are annular. By setting the diameter of the central sub-plate 203 to half the diameter of the disc, the opening and closing accuracy can be improved by four times through the opening and closing of different sub-plates.

[0033] The division of the sub-plates is not limited to concentric circles; it can also be formed by dividing the disc plate with multiple parallel chords. The area of ​​each sub-plate can be kept consistent by controlling the position of the parallel chords, thereby achieving multi-precision pressure control of the butterfly valve. The disc plate formed by splicing the sub-plates in this invention is not limited in form, as long as it can rotate independently through the rotation of the inner valve stem and the extension of the drive component.

[0034] In the embodiment where all sub-plates 201, 202, and 203 are formed by concentric circles, each sub-plate may correspond to two driving elements and two stopping elements. That is, one driving element and one stopping element are respectively provided at both ends of the radial direction of the sub-plate (such as the upper and lower sides of the disc plate, where the upper and lower direction specifically refers to the direction of valve stem extension), thereby ensuring the uniformity of the driving force and the stopping force applied to the sub-plate. In another embodiment, if all sub-plates are formed by parallel chords of the disc plate, each sub-plate may correspond to two driving elements and two stopping elements. That is, one driving element and one stopping element are respectively provided at both ends of the chord direction of the sub-plate (such as the left and right sides of the disc plate), thereby ensuring the uniformity of the driving force and the stopping force applied to the sub-plate.

[0035] As one embodiment, the above-mentioned power mechanism is a pneumatic pressure source, see Figure 2 and Figure 3 As shown, Figure 3 This is a partial cross-sectional view of the butterfly valve formed along the axis of the valve stem in the thickness direction of the disc. Figure 3The left and right directions can be understood as the thickness direction of the disc plate. The inner valve stem 31 is provided with multiple channels 401, and the outer valve stem 32 is provided with multiple channels 402. The channel 401 in the inner valve stem 31 is provided with a driving member 33 at its end, and the channel 402 in the outer valve stem 32 is provided with a stop member 34 at its end. The air pressure source is connected to the channels 401 and 402 to drive the driving member 33 or the stop member 34 to move radially through air pressure, so that the driving member 33 or the stop member 34 extends out of the outer valve stem and contacts and engages with the corresponding sub-plate. This embodiment utilizes a pneumatic source to drive each driving component and each stop component. For example, in an embodiment where all sub-plates 201, 202, and 203 are separated by concentric circles, when driving the central sub-plate 203 to rotate, the pneumatic source controls the pneumatic source to supply high-pressure air into the channel 401 in the inner valve stem corresponding to the sub-plate 203. This causes the driving component 33 to extend from the outer valve stem 32 and abut against the sub-plate 203, thus linking the driving component 33 and the sub-plate 203. The aforementioned driving mechanism drives the inner valve stem 31 to rotate, which in turn drives the sub-plate 203 via the driving component 33, thus achieving sub-plate... The oscillation of 203 causes the subplate 203 to rotate from the sealed position to the open position, or from the open position to the sealed position, thereby opening or closing the corresponding valve body cavity. No air source is supplied to other channels, meaning the driving components in other channels are located within the inner valve stem and do not extend, and the stop component corresponding to the subplate 203 is located within the outer valve stem and does not extend. When high air pressure is not supplied to the channel in the inner valve stem corresponding to the subplate 203, the driving component 33 in that channel is located within the inner valve stem and does not extend, meaning it is not in contact with the subplate. Even if the inner valve stem rotates, it will not drive the subplate to move. To ensure that the subplate can resist the impact force from the fluid flowing through the valve body when the butterfly valve is closed, a high-pressure air source is controlled to supply high air pressure to the channel 402 in the outer valve stem 32 corresponding to the subplate 203, thereby pushing out the stop component 34 to prevent the subplate from oscillating and keeping the subplate perpendicular to the valve body cavity axis, i.e., maintaining it in the sealed position.

[0036] In another embodiment, the aforementioned power mechanism is a hydraulic source. Both the inner valve stem 31 and the outer valve stem 32 have multiple channels, and each channel ends in a drive component or a stop component. The hydraulic source communicates with the channels to hydraulically drive each drive component or stop component to perform radial movement. This embodiment uses a hydraulic source instead of the pneumatic source of the previous embodiment, driving each drive component and stop component to move independently via hydraulic pressure. Whether the power mechanism uses a pneumatic or hydraulic source, all channels and through holes on the outer valve stem require a sealed design to prevent pneumatic or hydraulic leakage.

[0037] In another embodiment, the aforementioned power mechanism includes a power source and multiple transmission rods movably disposed within the inner and outer valve stems. Each transmission rod is connected to a driving component or a stopping component. The power source drives each driving component or stopping component to perform radial movement via the transmission rods. This embodiment achieves the radial movement of the driving and stopping components through mechanical transmission. The power source can be an electromagnetic drive, a telescopic cylinder, a motor, or a spring mechanism. By pulling the transmission rods, the extension or retraction of the driving and stopping components is achieved. Specifically, the transmission rods can be structural components such as steel wire.

[0038] In order to control the swing angle of each sub-plate, in a specific embodiment, the length of the through hole 35 in the circumferential direction of the outer valve stem 32 is less than one-quarter of the circumference of the outer valve stem; that is, by setting the through hole, the maximum rotation angle of the above-mentioned drive component is limited to 90°, thereby controlling the rotation angle of the sub-plate.

[0039] To improve the shut-off sealing capability of the butterfly valve, in one specific embodiment, the contact points of adjacent sub-plates each have a sealing portion. Specifically, the outer periphery of the sub-plate has a toothed structure, and adjacent sub-plates engage with each other through the toothed structure. In other embodiments, the sealing portion may be a sealing gasket or a sealing coating, etc.

[0040] This utility model also provides a vacuum tube, which includes a tube body and the butterfly valve described above disposed on the tube body. The vacuum tube of this embodiment integrates the above-mentioned butterfly valve, which can increase the pressure control capability. According to the vacuum regulation requirements, the number of sub-plates and the ratio of the sub-plate area to the disc plate can be set to achieve controllable pressure control accuracy.

[0041] Although the embodiments of this utility model have been described in detail above, it will be apparent to those skilled in the art that various modifications and variations can be made to these embodiments. However, it should be understood that such modifications and variations fall within the scope and spirit of this utility model as described in the claims. Moreover, the utility model described herein may have other embodiments and can be implemented or realized in various ways.

Claims

1. A butterfly valve, comprising a drive mechanism, a valve body, a disc disposed within the valve body, and a valve stem, characterized in that: The valve stem includes an outer valve stem and an inner valve stem. The inner valve stem is placed inside the outer valve stem and connected to the drive mechanism so as to rotate relative to the outer valve stem under the drive of the drive mechanism. The outer valve stem is fixedly connected to the valve body. The disc is connected to the valve stem and is composed of multiple sub-plates. Each sub-plate rotates independently around the valve stem and can be positioned in a sealed or open position. The sealed position partially severs the internal cavity of the valve body, while the open position allows part of the internal cavity of the valve body to remain open. The control assembly for driving each sub-plate includes a power mechanism, a plurality of driving members disposed in the inner valve stem and capable of moving radially along the inner valve stem, and a plurality of stop members disposed in the outer valve stem and capable of moving radially along the outer valve stem. The outer valve stem is provided with a plurality of through holes, each of which allows one of the driving members to pass through. Each subplate corresponds to a different driving member and a different stop member. The driving member extends the outer valve stem from the through hole under the drive of the power mechanism, and drives the corresponding subplate to rotate as the inner valve stem rotates, so that the subplate rotates from the sealed position to the open position, or from the open position to the sealed position. The stop member extends the outer valve stem under the drive of the power mechanism to stop the corresponding subplate and keep the subplate in the sealed position.

2. The butterfly valve according to claim 1, characterized in that, All the sub-plates are arranged sequentially from the inside to the outside along the radial direction of the disc, and all the sub-plates have the same center.

3. The butterfly valve according to claim 1, characterized in that, The power mechanism is a pneumatic source. Both the inner valve stem and the outer valve stem are provided with multiple channels. Each channel is provided with a driving component or a stop component at its end. The pneumatic source is connected to the channel to drive the driving component or the stop component to move radially through pneumatic pressure.

4. The butterfly valve according to claim 1, characterized in that, The power mechanism is a hydraulic source. Both the inner valve stem and the outer valve stem are provided with multiple channels. Each channel has a drive component or a stop component at its end. The hydraulic source is connected to the channel to drive the drive component or the stop component to move radially by hydraulic pressure.

5. The butterfly valve according to claim 1, characterized in that, The power mechanism includes a power source and multiple transmission rods movably disposed in the inner valve stem and the outer valve stem. The transmission rods are connected to one of the driving components or one of the stop components. The power source drives the driving component or the stop component to move radially through the transmission rods.

6. The butterfly valve according to claim 4, characterized in that, The power source is a telescopic cylinder, a motor, or a spring mechanism.

7. The butterfly valve according to claim 1, characterized in that, In the circumferential direction of the outer valve stem, the length of the through hole is less than one-quarter of the circumference of the outer valve stem.

8. The butterfly valve according to claim 1, characterized in that, Each of the adjacent sub-plates has a sealing part at the contact point.

9. The butterfly valve according to claim 1, characterized in that, The outer periphery of the sub-plate has a toothed structure, and adjacent sub-plates mesh with each other through the toothed structure.

10. A vacuum tube, characterized in that, The vacuum tube includes a tube body and a butterfly valve as described in any one of claims 1 to 9 disposed on the tube body.

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