Vacuum control valve

Abstract

The invention discloses a vacuum control valve, and relates to the technical field of valves. The multiple valve plates are rotationally connected with the valve body, rotating shafts are parallel to one another, and the multiple valve plates can be spliced into a valve element used for sealing a flow channel. The mounting piece is arranged on the valve body; the plurality of valve rods are respectively and coaxially connected with one valve plate; the multi-crank linkage mechanism comprises a plurality of cranks and a plurality of connecting rods, the cranks are coaxially connected with the valve rod and rotationally connected with the mounting piece, and every two adjacent cranks are in transmission connection through one connecting rod; the driving assembly is arranged on the mounting piece and is used for driving one crank to rotate; the area of a single valve plate and the area of a force arm are reduced compared with the area of a valve plate in the prior art, so that the sum of driving torques of the valve plates is reduced; a plurality of valve plates independently rotate to distribute flow channels, so that local high-speed jet flow is reduced, and pressure loss is reduced; when the driving assembly drives one of the cranks to rotate, all the cranks are driven by the connecting rod to rotate at the same time to drive the valve plates to rotate synchronously.

Description

Technical Field

[0001] The present invention relates to the field of valve technology, in particular to a vacuum control valve. Background Art

[0002] A vacuum control valve is a vacuum system component used to change the direction of airflow, adjust the amount of airflow, and cut off or connect pipelines in a vacuum system. A vacuum control valve usually includes a valve body, a valve core, and a drive mechanism. The drive mechanism controls the rotation of the valve core to change the flow area, thereby controlling the flow of the medium.

[0003] The valve core in the prior art is an integral plate-shaped structure. Under the action of pressure difference, the valve core requires a large driving torque to be driven, which makes it difficult to drive the valve core. Summary of the invention

[0004] The main purpose of the present invention is to provide a vacuum control valve, aiming to solve the technical problem in the prior art that the valve core is an integral whole and the valve core is difficult to drive.

[0005] To achieve the above object, the present invention provides a vacuum control valve, comprising: A valve assembly comprises a valve body and a plurality of valve plates; the valve body is provided with a flow channel; the plurality of valve plates are rotatably connected to the valve body and the rotation axes are parallel to each other, and the plurality of valve plates can be spliced ​​into a valve core for sealing the flow channel; Drive components; A transmission assembly comprises a mounting member, a multi-crank linkage mechanism and a plurality of valve stems; the mounting member is arranged on the valve body; the plurality of valve stems are coaxially connected to one of the valve plates respectively; the multi-crank linkage mechanism comprises a plurality of cranks and a plurality of connecting rods, the cranks are coaxially connected to the valve stems and the cranks are rotationally connected to the mounting member, and two adjacent cranks are transmission-connected via one of the connecting rods; the drive assembly is arranged on the mounting member and is used to drive one of the cranks to rotate.

[0006] Optionally, the number of the valve plates is three, and the plurality of valve stems are distributed at equal intervals.

[0007] Optionally, the number of the cranks is the same as the number of the valve plates, the number of the connecting rods is two and the length of the connecting rods is adjustable, wherein the rotation directions of the two cranks are the same and opposite to the rotation direction of the other crank.

[0008] Optionally, the valve plate has a contact surface for splicing adjacent valve plates, the contact surface forms a contact angle with the plate surface of the valve plate, and the size of the contact angle is 10°~30°.

[0009] Optionally, a ring-shaped protrusion is provided on the side wall of the flow channel, the protrusion extends towards the axis of the flow channel, the protrusion includes two intersecting first conical surfaces and second conical surfaces, and one of the first conical surface and the second conical surface is in contact with the side wall of the valve core.

[0010] Optionally, the mounting member includes a housing and a plurality of valve seats; the housing and the valve seats are both arranged on the valve body, the valve seats are located inside the housing; the crank is rotatably connected to the valve seat, the valve rod passes through the valve body and is connected to the crank; the driving assembly is used to drive one of the cranks to rotate.

[0011] Optionally, the transmission assembly further includes a plurality of first bearings and a plurality of second bearings; the valve body is provided with a plurality of mounting grooves for mounting the first bearings, both ends of each first bearing are provided with the second bearings, the second bearings are end face bearings, and the valve rod passes through the second bearings, the first bearings and the valve seats and is connected to the crank.

[0012] Optionally, the transmission assembly further includes a plurality of seals, and the seals are sleeved on the valve rod and located between the first bearing and the valve plate.

[0013] Optionally, the driving assembly includes a coupling, a driving motor and a control circuit board that are electrically connected to each other; the driving motor is arranged on the mounting member, and both ends of the coupling are respectively connected to the rotating shaft of the driving motor and the crank.

[0014] Optionally, the driving assembly further includes a protective shell and a display, and the display is arranged on the protective shell and is electrically connected to the control circuit board.

[0015] In the prior art, if the pressure difference received by a single valve plate is ΔP, the area of a single valve plate is A, and the force arms of a single valve plate are A respectively, then the driving torque of a single valve plate is ΔP * A * r. And by using the vacuum control valve of the present invention, a plurality of valve plates can be spliced together to seal the flow channel of the valve body. The pressure difference received by a single valve plate is ΔP, and the area and force arm of a single valve plate are both reduced relative to the area of the valve plate in the prior art, so that the sum of the driving torques of the plurality of valve plates is less than ΔP * A * r, making it easier for the driving assembly to drive the plurality of valve plates to rotate through the transmission assembly; the plurality of valve plates can rotate independently to distribute the flow channel, reduce local high-speed jet flow, and reduce pressure loss; a plurality of cranks and a plurality of connecting rods form a multi-crank linkage mechanism. When the driving assembly drives one of the cranks to rotate, all the cranks rotate simultaneously under the drive of the connecting rod, and the valve plates are connected to the cranks through the valve rods. Therefore, the driving assembly can drive the plurality of valve plates to rotate synchronously through the multi-crank linkage mechanism. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0017] Figure 1 Structural schematic diagram of the vacuum control valve according to the embodiment of the present invention; Figure 2 Axial view of the vacuum control valve according to the embodiment of the present invention; Figure 3 Partial exploded view of the vacuum control valve according to the embodiment of the present invention; Figure 4 Exploded view of the drive assembly according to the embodiment of the present invention; Figure 5 Exploded view of the transmission assembly according to the embodiment of the present invention; Figure 6 Exploded view of the valve assembly according to the embodiment of the present invention; Figure 7 Cross-sectional view of the valve body according to the embodiment of the present invention.

[0018] Icon: 100, valve assembly; 101, valve body; 1011, base; 102, valve plate; 103, flow channel; 1031, first conical surface; 1032, second conical surface; 104, sealing ring; 200, drive assembly; 201, coupling; 202, drive motor; 203, control circuit board; 204, protective shell; 205, display; 206, mounting seat; 207, cover body; 208, connecting seat; 300, transmission assembly; 3011, housing; 3012, valve seat; 3013, cover plate; 3021, crank; 3022, connecting rod; 3023, pin; 303, valve stem; 304, first bearing; 305, second bearing; 306, seal. Detailed implementation manners

[0019] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0020] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship, movement conditions, etc. between components in a specific posture (as shown in the attached drawings). If the specific posture changes, the directional indications will change accordingly.

[0021] In the present invention, unless otherwise clearly defined and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0022] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" can explicitly or implicitly include at least one such feature. In addition, the meaning of "and / or" appearing throughout the text includes three parallel scenarios. Taking "A and / or B" as an example, it includes scenario A, scenario B, or the scenario where A and B are satisfied simultaneously. In addition, the technical solutions between various embodiments can be combined with each other, but it must be based on the ability of those of ordinary skill in the art to implement. When the combination of technical solutions results in contradictions or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope required by the present invention.

[0023] In the prior art, if the pressure difference received by a single valve plate is ΔP, the area of a single valve plate is A, and the force arms of a single valve plate are both A, then the driving torque of a single valve plate is ΔP * A * r.

[0024] Reference Figures 1-7 , the embodiments of the present application provide a vacuum control valve, including: A valve assembly 100, including a valve body 101 and a plurality of valve plates 102; the valve body 101 is provided with a flow channel 103; the plurality of valve plates are rotatably connected to the valve body 101 and the rotation axes are parallel to each other, and the plurality of valve plates 102 can be spliced into a valve core for sealing the flow channel 103; A driving assembly 200; The transmission assembly 300 includes a mounting member, a multi-crank linkage mechanism, and a plurality of valve stems 303; the mounting member is disposed on the valve body 101; the plurality of valve stems 303 are coaxially connected to a valve plate 102 respectively; the multi-crank linkage mechanism includes a plurality of cranks 3021 and a plurality of connecting rods 3022, the crank 3021 is coaxially connected to the valve stem 303 and the crank 3021 is rotatably connected to the mounting member, and two adjacent cranks 3021 are drivingly connected by a connecting rod 3022; the driving assembly 200 is disposed on the mounting member and is used to drive one of the cranks 3021 to rotate.

[0025] The plurality of valve plates 102 can be spliced together to seal the flow passage 103 of the valve body 101. Let the number of valve plates 102 be N, the pressure difference received by a single valve plate 102 be ΔP, and the area and the force arm of a single valve plate 102 are both reduced compared with the area of the valve plate 102 in the prior art. For example, the area of a single valve plate 102 can be A / N, and the force arm of a single valve plate 102 can be r / N. Then the driving torque of a single valve plate 102 is ΔP*(A / N)*(r / N), and the driving torque of N valve plates 102 is ΔP*A*r / N, which is less than the driving torque ΔP*A*r in the prior art.

[0026] In some embodiments, the area of a single valve plate 102 is a value different from A / N. For example, the number of valve plates 102 is 3 and the area ratio is (A / 4):(A / 2):(A / 4)=1:2:1. The force arms of the single valve plates 102 can be r / 4, r / 2, r / 4 respectively. Then the total driving torque of the 3 valve plates 102 is: ΔP*(A / 4)*r / 4 + ΔP*(A / 2)*r / 2 + ΔP*(A / 4)*r / 4 = 3ΔP*A*r / 8, The sum of the driving torques of the plurality of valve plates 102 will still be less than ΔP*A*r. Therefore, it is easier for the driving assembly 200 to drive the plurality of valve plates 102 to rotate through the transmission assembly 300 compared with the prior art. The independent rotation of the plurality of valve plates 102 can distribute the flow passage 103, reduce local high-speed jet flow, and reduce the pressure loss.

[0027] The plurality of cranks 3021 and the plurality of connecting rods 3022 form a multi-crank linkage mechanism. When the driving assembly 200 drives one of the cranks 3021 to rotate, all the cranks 3021 rotate simultaneously under the drive of the connecting rod 3022, and the valve plate 102 is connected to the crank 3021 through the valve stem 303. Thus, the driving assembly 200 can drive the plurality of valve plates 102 to rotate synchronously through the multi-crank linkage mechanism.

[0028] Sealing rings 104 can be provided at both axial ends of the valve body 101.

[0029] As an alternative embodiment, the number of valve plates 102 is three, and multiple valve stems 303 are evenly distributed. In this embodiment, assuming the cross-sectional area of the flow channel 103 is A, since the 3 valve plates 102 are evenly distributed and the area of each valve plate 102 is similar, the area of a single valve plate 102 is set as A / 3, and the moment arm of a single valve plate 102 is r / 3. Then the driving torque of a single valve plate 102 is ΔP*(A / 3)*(r / 3), and the total driving torque of the 3 valve plates 102 is ΔP*A*r / 3.

[0030] The areas of each valve plate 102 are similar, and the torque borne by each valve plate 102 during rotation is more balanced, which helps to reduce mechanical losses and uneven wear.

[0031] As an alternative embodiment, the number of cranks 3021 is the same as that of the valve plates 102, the number of connecting rods 3022 is two and the length of the connecting rods 3022 is adjustable. The rotation directions of the two cranks 3021 are the same and opposite to that of the other crank 3021.

[0032] The two valve plates 102 rotating in the same direction and the third valve plate 102 rotating in the opposite direction form a torque pair, and part of the driving torque cancels each other out; the valve plate 102 rotating in the opposite direction breaks the symmetric flow in the flow channel 103, avoiding the periodic eddy currents (such as von Karman vortex street) caused by the same-direction rotation, and reducing the turbulence intensity; the valve plate 102 rotating in the opposite direction can form an alternating shear force with the valve plates 102 rotating in the same direction when closed, removing the particles attached to the surface of the valve plates 102.

[0033] The connecting rod 3022 with adjustable length is a prior art, such as an "adjustable connecting rod", and the specific structure of the connecting rod 3022 will not be elaborated here.

[0034] The crank 3021 can be provided with a card slot and a first connection hole that communicate with each other. The connecting rod 3022 can be provided with a second connection hole. Insert the connecting rod 3022 into the card slot, align the first connection hole and the second connection hole, and then insert the pin 3023 into the first connection hole and the second connection hole to complete the connection between the crank 3021 and the connecting rod 3022. The pin 3023 and the first connection hole can be in interference fit, and the pin 3023 and the second connection hole can be in clearance fit, so that the connecting rod 3022 can rotate relative to the pin 3023.

[0035] As an alternative embodiment, the valve plate 102 has a contact surface (not shown in the figure) for splicing adjacent valve plates 102. The contact surface forms a contact angle with the plate surface of the valve plate 102, and the size of the contact angle is 10° to 30°.

[0036] The contact angle can be 15°.

[0037] 1. The existence of the contact angle can improve the sealing performance between the valve plates 102. When the valve plates 102 rotate, an effective sealing pressure is more likely to be generated on the contact surface. The angle design can avoid direct friction and uneven contact between completely parallel contact surfaces, ensuring a more uniform and stable sealing effect between the valve plates 102, thereby reducing leakage.

[0038] 2. The design of the contact angle helps to reduce the direct friction between the valve plates 102. If the contact surfaces are completely parallel, relatively large frictional forces may be generated when the valve plates 102 rotate, leading to high wear.

[0039] 3. By designing the contact angle, the contact force of the valve plates 102 can be more evenly distributed on the contact surface. The rotation of the valve plates 102 and the existence of the contact angle can reduce the pressure concentration phenomenon caused by single-point contact, ensuring that the valve plates 102 maintain a relatively balanced stress state during operation and preventing local damage or excessive stress.

[0040] 4. During the rotation of the valve plates 102, the contact angle can reduce the vibration generated due to interference or friction between adjacent valve plates 102. Reducing vibration helps to reduce noise and also prevents abnormal noises or damage to the components of the valve body 101 caused by uneven stress.

[0041] As an alternative implementation, a ring-shaped protrusion is provided on the side wall of the flow channel 103. The protrusion extends towards the axis of the flow channel 103. The protrusion includes two intersecting first conical surfaces 1031 and second conical surfaces 1032, and one of the first conical surface 1031 and the second conical surface 1032 is in contact with the side wall of the valve core.

[0042] The angle between the generatrix of the first conical surface 1031 and the axis of the valve body 101 can be 19.4°, and the angle between the generatrix of the second conical surface 1032 and the axis of the valve body 101 can be 6.9°. The sharp corner of the protrusion guides the smooth transition of the fluid by changing the cross-sectional shape of the flow channel 103, avoiding the generation of separated eddies at the edge of the valve plate 102 and reducing the local turbulence intensity.

[0043] The gradually shrinking - gradually expanding flow channel formed by the protrusion disperses the pressure difference load, avoiding the occurrence of supercritical pressure drop downstream of the valve plate 102, thereby delaying the generation of cavitation.

[0044] The ring-shaped protrusion can serve as a local stiffener of the valve body 101, enhancing the flexural stiffness of the side wall of the valve body 101 and resisting the periodic deformation caused by fluid pulsation pressure.

[0045] The ring-shaped protrusion can form a guiding track to limit the lateral offset of the valve plate 102 and reduce the vibration amplitude.

[0046] As an alternative embodiment, the mounting member includes a housing 3011 and a plurality of valve seats 3012; both the housing 3011 and the valve seats 3012 are disposed on the valve body 101, and the valve seats 3012 are located within the housing 3011; the crank 3021 is rotatably connected to the valve seat 3012, and the valve stem 303 passes through the valve body 101 and is connected to the crank 3021; the drive assembly 200 is configured to drive one of the cranks 3021 to rotate.

[0047] A base 1011 may be provided at the position of the valve body 101 corresponding to the mounting member, and the valve stem 303 passes through the base 1011 and is then connected to the valve plate 102. Both the housing 3011 and the valve seats 3012 are fixed to the base 1011. The housing 3011 protects the multi-crank linkage mechanism and prevents external dust and impurities from accumulating on the multi-crank linkage mechanism, affecting its operation.

[0048] The mounting member may further include a cover plate 3013. The housing 3011 may be cylindrical, and a cover plate 3013 is provided at one end of the housing 3011 close to the drive assembly 200.

[0049] As an alternative embodiment, the transmission assembly 300 further includes a plurality of first bearings 304 and a plurality of second bearings 305; the valve body 101 is provided with a plurality of mounting grooves for mounting the first bearings 304, and both ends of each first bearing 304 are provided with second bearings 305. The second bearings 305 are end face bearings, and the valve stem 303 passes through the second bearings 305, the first bearings 304, and the valve seats 3012 and is connected to the crank 3021.

[0050] To prevent the first bearings 304 from wearing the valve seats 3012 and the valve body 101 during rotation, the second bearings 305 are provided at both ends of the first bearings 304, and the first bearings 304 are used to reduce the wear between the valve stem 303 and the valve body 101.

[0051] As an alternative embodiment, the transmission assembly 300 further includes a plurality of seals 306. The seals 306 are sleeved on the valve stem 303 and are located between the first bearings 304 and the valve plate 102.

[0052] The seals 306 may be metal bellows with a compression amount greater than 30% and are resistant to -196°C to 350°C. The seals 306 can prevent the fluid in the valve body 101 from leaking.

[0053] As an alternative embodiment, the drive assembly 200 includes a coupling 201, a drive motor 202 and a control circuit board 203 that are electrically connected to each other; the drive motor 202 is disposed on the mounting member, and both ends of the coupling 201 are respectively connected to the rotating shaft of the drive motor 202 and the crank 3021.

[0054] The driving motor 202 drives the rotation of one of the cranks 3021 through the coupling 201, and the crank 3021 then drives the rotation of the other cranks 3021 through the connecting rod 3022, thereby driving the rotation of all the valve stems 303.

[0055] As an alternative embodiment, the driving assembly 200 further includes a protective housing 204 and a display 205. The display 205 is disposed on the protective housing 204 and electrically connected to the control circuit board 203.

[0056] The driving assembly 200 may further include a mounting base 206, a cover 207, and a connecting seat 208. The driving motor 202 can be first fixed on the mounting base 206. The mounting base 206 is connected to the connecting seat 208, and then the connecting seat 208 is connected to the mounting member. The coupling 201 is located within the connecting seat 208.

[0057] The mounting base 206 and the cover 207 are disposed on the protective housing 204 and are respectively located on the axial two sides of the driving motor 202, wherein the base 1011 is close to the rotating shaft of the driving motor 202. Heat dissipation holes may be provided on the cover 207. Both the control circuit board 203 and the driving motor 202 are located inside the protective housing 204.

[0058] The display 205 can be used to display the opening and closing degree of the valve plate 102. After the driving motor 202 rotates at different angles, the position of the valve plate 102 corresponding to the valve body 101 is also different. The angle signal of the driving motor 202 corresponds to different opening degrees of the valve plate 102. The angle signal of the driving motor 202 is transmitted to the control circuit board 203, and the control circuit board 203 then controls the display 205 to display different opening degree values.

[0059] The above are only alternative embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. All equivalent structural transformations made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields, are included in the patent protection scope of the present invention.

Claims

1. A vacuum control valve, characterized in that, include: A valve assembly comprises a valve body and a plurality of valve plates; the valve body is provided with a flow channel; the plurality of valve plates are rotatably connected to the valve body and the rotation axes are parallel to each other, and the plurality of valve plates can be spliced ​​into a valve core for sealing the flow channel; Drive components; A transmission assembly comprises a mounting member, a multi-crank linkage mechanism and a plurality of valve stems; the mounting member is arranged on the valve body; the plurality of valve stems are coaxially connected to one of the valve plates respectively; the multi-crank linkage mechanism comprises a plurality of cranks and a plurality of connecting rods, the cranks are coaxially connected to the valve stems and the cranks are rotationally connected to the mounting member, and two adjacent cranks are transmission-connected via one of the connecting rods; the drive assembly is arranged on the mounting member and is used to drive one of the cranks to rotate.

2. The vacuum control valve according to claim 1, wherein, The number of the valve plates is three, and the plurality of valve stems are distributed at equal intervals.

3. The vacuum control valve according to claim 2, wherein, The number of the cranks is the same as the number of the valve plates, the number of the connecting rods is two and the length of the connecting rods is adjustable, wherein the rotation directions of the two cranks are the same and opposite to the rotation direction of the other crank.

4. The vacuum control valve according to claim 1, characterized in that, The valve plate has a contact surface for splicing adjacent valve plates, the contact surface forms a contact angle with the plate surface of the valve plate, and the size of the contact angle is 10°~30°.

5. The vacuum control valve according to claim 1, characterized in that, The side wall of the flow channel is provided with an annular protrusion, which extends toward the axis of the flow channel. The protrusion includes two intersecting first conical surfaces and second conical surfaces, and one of the first conical surface and the second conical surface is in contact with the side wall of the valve core.

6. The vacuum control valve according to claim 1, wherein The mounting member includes a shell and a plurality of valve seats; the shell and the valve seats are both arranged on the valve body, and the valve seats are located in the shell; the crank is rotatably connected to the valve seat, and the valve stem passes through the valve body and is connected to the crank; the drive assembly is used to drive one of the cranks to rotate.

7. The vacuum control valve according to claim 6, wherein, The transmission assembly also includes multiple first bearings and multiple second bearings; the valve body is provided with multiple mounting grooves for installing the first bearings, and each of the first bearings is provided with a second bearing at both ends, and the second bearing is an end face bearing. The valve stem passes through the second bearing, the first bearing and the valve seat and is connected to the crank.

8. The vacuum control valve according to claim 7, characterized in that, The transmission assembly further comprises a plurality of sealing members, wherein the sealing members are sleeved on the valve stem and are located between the first bearing and the valve plate.

9. The vacuum control valve according to claim 1, characterized in that, The driving assembly includes a coupling, a driving motor and a control circuit board which are electrically connected to each other; the driving motor is arranged on the mounting member, and the two ends of the coupling are respectively connected to the rotating shaft of the driving motor and the crank.

10. The vacuum control valve according to claim 9, characterized in that, The driving assembly further includes a protective shell and a display, wherein the display is disposed on the protective shell and is electrically connected to the control circuit board.

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