CN114151599B - Control valve and flow capacity adjusting mechanism thereof - Google Patents
Control valve and flow capacity adjusting mechanism thereof Download PDFInfo
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- CN114151599B CN114151599B CN202010932075.9A CN202010932075A CN114151599B CN 114151599 B CN114151599 B CN 114151599B CN 202010932075 A CN202010932075 A CN 202010932075A CN 114151599 B CN114151599 B CN 114151599B
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- 230000007246 mechanism Effects 0.000 title claims abstract description 45
- 238000005452 bending Methods 0.000 claims abstract description 8
- 230000000149 penetrating effect Effects 0.000 claims abstract description 4
- 238000013519 translation Methods 0.000 claims description 11
- 238000006073 displacement reaction Methods 0.000 claims description 8
- 230000008859 change Effects 0.000 abstract description 9
- 238000000034 method Methods 0.000 abstract description 9
- 230000008569 process Effects 0.000 abstract description 8
- 238000012856 packing Methods 0.000 description 15
- 239000000463 material Substances 0.000 description 6
- 238000003825 pressing Methods 0.000 description 6
- 238000007789 sealing Methods 0.000 description 6
- 239000012530 fluid Substances 0.000 description 5
- 238000005984 hydrogenation reaction Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000010008 shearing Methods 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 241000282346 Meles meles Species 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
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- 238000012423 maintenance Methods 0.000 description 2
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- 238000011160 research Methods 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
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- 230000001276 controlling effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
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- 230000001360 synchronised effect Effects 0.000 description 1
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/44—Mechanical actuating means
- F16K31/52—Mechanical actuating means with crank, eccentric, or cam
- F16K31/524—Mechanical actuating means with crank, eccentric, or cam with a cam
- F16K31/52408—Mechanical actuating means with crank, eccentric, or cam with a cam comprising a lift valve
- F16K31/5245—Mechanical actuating means with crank, eccentric, or cam with a cam comprising a lift valve with a valve member of conical shape
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/54—Arrangements for modifying the way in which the rate of flow varies during the actuation of the valve
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K35/00—Means to prevent accidental or unauthorised actuation
- F16K35/10—Means to prevent accidental or unauthorised actuation with locking caps or locking bars
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Mechanically-Actuated Valves (AREA)
Abstract
The invention discloses a circulation capacity adjusting mechanism, which comprises: the bending part of the L-shaped connecting block is provided with an eccentric wheel which is provided with a strip-shaped through hole; the rectangular shaft is arranged in the strip-shaped through hole in a penetrating way, the two ends of the rectangular shaft are outwards extended to form rotating shaft parts, and the rectangular shaft and the eccentric wheel can relatively move along the long side direction of the strip-shaped through hole, so that the eccentricity e of the eccentric wheel is changed; a slide bar connected with the end of the first arm of the L-shaped connecting block; and the lower end surface of the driven ejector rod is tangent to and abutted against the eccentric wheel, wherein the sliding rod horizontally translates along the transverse direction to drive the L-shaped connecting block to rotate around the rotating shaft part, and the eccentric wheel drives the driven ejector rod to longitudinally move up and down. The invention also discloses a control valve. The invention can change the circulation capacity of the valve by adjusting the eccentric distance of the eccentric wheel so as to adapt to different process conditions; the long stroke and the low acting force of the sliding rod are converted into the high acting force of the valve core under the small stroke, so that the stable control of the small flow is realized.
Description
Technical Field
The invention relates to the technical field of flow control devices, in particular to a control valve and a flow capacity adjusting mechanism thereof.
Background
Many small, miniature experimental devices are required to operate under high pressure conditions, such as hydrogenation, fischer-tropsch synthesis, coal liquefaction, high pressure polymerization, etc., typically at pressures of 10 to 20MPa, and some devices operate even at ultra-high pressures in excess of 100 MPa. These high pressure experimental units have very small throughput, for example, hydrogenation experimental units with a catalyst loading of 100mL, and liquid phase throughput is typically around 100 mL/h. Continuously and smoothly discharging the process product under the severe working condition of high pressure difference and small flow is always a difficult problem to solve.
Currently, there are some control valves on the market that can be applied to high pressure differential and small flow rates, but most of these control valves are expensive. For example, the United states oil company full cycle medium hydrogenation experimental apparatus, the United states Utility (Unocal) medium and small hydrogenation experimental apparatus, all use the Badger Meter research control valve and Masonailan ANNIN and VariPak valves.
The valve core of the Badger Meter research control valve adopts an extremely fine micro conical valve needle and a cylinder Kong Fa, the diameter of the cylinder hole of some valve seats is smaller than 0.5mm, and for such a precise valve core, the tightness and the control performance of the precise valve core can be influenced by extremely fine abrasion, so that the durability is poor, and the valve core is frequently replaced; the valve circulation capacity is regulated to change different valve cores, and the valve belongs to a regulating valve with fixed circulation capacity; in addition, the fine valve core is difficult to process, and the cost of accessories and the maintenance cost are high.
The Masoneilan and VariPak valves employ relatively large spool sizes and convert the long stroke of the actuator into a small stroke of the spool by a lever mechanism, and change the flow performance by adjusting the length of the lever mechanism resistance arm. The durability of the valve core is improved, but the flow capacity is inconvenient to adjust on line, and the processes of disassembling and fastening corresponding parts, resetting the closing position of the valve core, isolating the valve and suspending the process control are needed; in the use process, the valve seat is clamped to cause the valve core to be broken or the mechanism is locked. Due to the special structure, the two valves need to adopt special actuators and valve positioners, and the flexibility of configuration is limited; in addition, it is more expensive.
The micro-stroke and large-size valve core is adopted to control the micro flow under the severe condition of high pressure difference, so that the method is a good solution. Because the stroke is tiny, the flowing clearance between the valve needle and the valve seat is tiny, and when the fluid flows in the narrow annular channel, a flowing area dominated by a boundary layer is formed; the flow resistance is controlled by the shearing force between the fluid and the wall surface, and for the same flow area, the larger the equivalent diameter of the channel is, the larger the distance from the center of the fluid to the wall surface is, and the more the shearing force is weakened; the smaller the equivalent diameter, the smaller the distance from the center of the fluid to the wall surface, the less the shearing force is weakened, the stronger the control capability of the shearing force on the fluid is, and the more stable the flow is, so that the expansion of the valve core size and the reduction of the flow gap are beneficial to improving the stability of control.
The flow region dominated by the boundary layer more closely conforms to the assumptions of the Hagen-poisseille equation. For a valve with fixed upstream and downstream pressure differences and tiny stroke, the length of a flow channel is basically unchanged, and the flow rate of the valve depends on the square of the equivalent diameter of the flow channel; for valve cores with large size and obvious taper, even extremely small stroke changes can generate large flow changes. Therefore, it is critical to solve the problem how to accurately translate the required subtle changes in stroke or subtle changes in force into apparent displacements that can be identified by the actuator.
In addition, an open and flexible control valve integral structure is built, so that the control valve has flexibility in configuration and practicability in easy maintenance and adjustment, and the control valve is an important problem to be solved.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person of ordinary skill in the art.
Disclosure of Invention
One of the objects of the present invention is to provide a control valve and a flow capacity adjusting mechanism thereof, thereby improving the adjustment control of a micro flow valve under a high pressure condition in the prior art.
Another object of the present invention is to provide a control valve and a flow capacity adjustment mechanism thereof, thereby improving the control accuracy of the existing micro-flow valve.
Another object of the present invention is to provide a control valve and a flow capacity adjusting mechanism thereof, so as to solve the problem of small application range of the existing micro flow valve.
To achieve the above object, according to a first aspect of the present invention, there is provided a flow-through capacity adjustment mechanism comprising: the bending part of the L-shaped connecting block is provided with an eccentric wheel which is provided with a strip-shaped through hole; the rectangular shaft is arranged in the strip-shaped through hole in a penetrating way, the two ends of the rectangular shaft are outwards extended to form rotating shaft parts, and the rectangular shaft and the eccentric wheel can relatively move along the long side direction of the strip-shaped through hole, so that the eccentricity e of the eccentric wheel is changed; a slide bar connected with the end of the first arm of the L-shaped connecting block; and the lower end surface of the driven ejector rod is tangent to and abutted against the eccentric wheel, wherein the sliding rod horizontally translates along the transverse direction to drive the L-shaped connecting block to rotate around the rotating shaft part, and the eccentric wheel drives the driven ejector rod to longitudinally move up and down.
Further, in the above technical scheme, the circulation capacity adjusting mechanism further comprises a main frame, and the main frame comprises: the shaft hole is perpendicular to the sliding rod, and the rotating shaft part of the rectangular shaft is rotatably arranged in the shaft hole in a penetrating way; and the first limiting part is used for limiting the initial position of the sliding rod in the transverse translation, and when the sliding rod is abutted against the first limiting part, the long side of the strip-shaped through hole is in the transverse direction.
Further, in the above technical scheme, the main frame further includes: and the second limiting part is used for limiting the maximum position of the sliding rod in the transverse translation.
Further, in the above-mentioned technical scheme, circulation ability adjustment mechanism still includes locking reset assembly, and locking reset assembly includes: the linkage rod is arranged in parallel with the driven ejector rod; the cross beam is used for connecting the top end of the linkage rod with the driven ejector rod; and the reset spring is sleeved outside the linkage rod, the upper end of the reset spring is fixedly connected with the main frame, the lower end of the reset spring is fixedly connected to the linkage rod, and the reset spring is in a compressed state.
Further, in the above technical scheme, the eccentric wheel is provided with an adjusting screw, and the adjusting screw drives the eccentric wheel to move along the long side direction of the strip-shaped through hole so as to adjust the eccentric distance e of the eccentric wheel.
Further, in the above technical scheme, the outer end of the adjusting screw is provided with a limiting shaft lever, the limiting shaft lever is rotatably clamped on the main frame, the outer end of the limiting shaft lever is connected with the adjusting hand wheel, and the adjusting hand wheel drives the limiting shaft lever and the adjusting screw to rotate, so that the eccentric wheel is driven to move.
Further, in the above technical solution, when the rectangular shaft is abutted against the end of the strip-shaped through hole, which is closer to the bending position, the eccentric distance of the eccentric wheel is zero, and when the rectangular shaft is abutted against the end of the strip-shaped through hole, which is farther from the bending position, the eccentric distance of the eccentric wheel is the maximum value e max 。
Further, in the above technical solution, when the rotation angle of the L-shaped connection block around the rotation shaft portion is α, the longitudinal displacement of the driven ejector rod is e×sin α.
Further, in the above technical scheme, the long edge of the strip-shaped through hole extends along the second arm direction of the L-shaped connecting block.
Further, in the above technical scheme, the tip of first arm is equipped with rectangular hole, and the slide bar is equipped with the round pin axle, and the round pin axle can follow length direction in rectangular hole and slide.
Further, in the above technical scheme, the bottom end of the driven ejector rod is provided with the platform part.
According to a second aspect of the present invention, there is provided a control valve comprising: a circulation capacity adjustment mechanism according to any one of the above aspects; the valve core of the valve is connected with a driven ejector rod of the flow capacity adjusting mechanism; the actuator is connected with the sliding rod of the circulation capacity adjusting mechanism; the actuator drives the sliding rod to horizontally move, and drives the driven ejector rod to drive the valve core of the valve to longitudinally move so as to adjust the opening of the valve.
Furthermore, in the technical scheme, the valve is a high-pressure valve, and the valve core comprises a conical valve needle.
Further, in the above technical solution, the actuator is a piston actuator or a diaphragm actuator.
Compared with the prior art, the invention has the following beneficial effects:
1. the control valve and the circulation capacity adjusting mechanism thereof can realize the adjustment of the circulation capacity of the valve by adjusting the eccentricity of the eccentric wheel so as to adapt to different process conditions, and are more convenient to adjust and control.
2. The long stroke and the low acting force transmitted by the sliding rod are converted into the high acting force of the valve core under the tiny stroke, so that the influence of unbalanced force and friction force under severe working conditions is effectively overcome, and the tiny flow is stably controlled through extremely tiny opening or acting force change.
3. The control valve and the flow capacity adjusting mechanism thereof can be connected with different valves and/or actuators through structures such as connectors, and have flexibility and universality. The valve can adopt a conventional high-pressure valve structure, and the valve core adopts a long conical valve needle and a valve seat which are commonly used for small flow control. By adopting the micro opening control, the valve core can adopt a relatively large geometric dimension, so that the valve core is easier to process and manufacture and is stronger and durable.
The foregoing description is only an overview of the present invention, and it is to be understood that it is intended to provide a more clear understanding of the technical means of the present invention and to enable the technical means to be carried out in accordance with the contents of the specification, while at the same time providing a more complete understanding of the above and other objects, features and advantages of the present invention, and one or more preferred embodiments thereof are set forth below, together with the detailed description given below, along with the accompanying drawings.
Drawings
Fig. 1 is a schematic perspective view of a control valve according to an embodiment of the present invention.
Fig. 2 is a schematic front view of a control valve according to an embodiment of the present invention.
Fig. 3 is a schematic rear view of a control valve according to an embodiment of the present invention.
Fig. 4 is an exploded schematic view of a control valve according to an embodiment of the present invention.
FIG. 5 is a schematic cross-sectional structural view of a flow-through capacity adjustment mechanism according to an embodiment of the present invention, wherein the slide bar is not shown.
Fig. 6 is a schematic structural view of a main frame according to an embodiment of the present invention.
FIG. 7 is a schematic diagram of a throughput adjustment mechanism rotated by an angle α at different eccentricities according to an embodiment of the present invention.
Fig. 8 is a schematic view of a locking reset assembly according to an embodiment of the present invention wherein the reset spring is not shown.
Fig. 9 is a schematic structural view of a valve according to an embodiment of the present invention.
Fig. 10 is a schematic structural view of a control valve according to another embodiment of the present invention.
The main reference numerals illustrate:
10-main frame, 11-main body, 111-shaft hole, 112-first limit part, 1121-limit ejector pin, 113-second limit part, 12-cover plate, 13-vertical back plate, 20-circulation capacity adjusting mechanism, 21-L-shaped connecting block, 211-first arm, 2111-strip hole, 212-second arm, 2121-round bottom clamping groove, 2122-round bottom shoulder, 22-eccentric wheel, 221-strip through hole, 23-rectangular shaft, 231-rotating shaft part, 24-slide bar, 241-pin shaft, 25-driven ejector pin, 251-platform part, 26-locking reset component, 261-linkage rod, 262-beam, 263-reset spring, 2631-fastening nut, 2632-spring washer, 264-locking ejector rod, 271-adjusting screw, 272-limiting shaft rod, 273-adjusting hand wheel, 274-square shaft rod, 275-locking nut, 276-gasket, 2761-flange, 30-valve, 31-valve core, 311-valve needle, 32-valve body, 321-valve seat, 322-material inlet, 323-material outlet, 324-mounting flange, 33-packing press cap, 34-packing press ring, 35-sealing packing, 36-packing support ring, 40-actuator, 50-valve connector, 60-high pressure valve, 61-switching frame, 70-diaphragm type actuator, 71-actuator bracket, 72-valve positioner, 721-valve positioner bracket.
Detailed Description
The following detailed description of embodiments of the invention is, therefore, to be taken in conjunction with the accompanying drawings, and it is to be understood that the scope of the invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the term "comprise" or variations thereof such as "comprises" or "comprising", etc. will be understood to include the stated element or component without excluding other elements or other components.
Spatially relative terms, such as "below," "beneath," "lower," "above," "upper," and the like, may be used herein for ease of description to describe one element's or feature's relationship to another element's or feature's in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the article in use or operation in addition to the orientation depicted in the figures. For example, if the article in the figures is turned over, elements described as "below" or "beneath" other elements or features would then be oriented "above" the elements or features. Thus, the exemplary term "below" may encompass both a direction of below and a direction of above. The article may have other orientations (rotated 90 degrees or other orientations) and the spatially relative descriptors used herein interpreted accordingly.
The terms "first," "second," and the like herein are used for distinguishing between two different elements or regions and are not intended to limit a particular position or relative relationship. In other words, in some embodiments, the terms "first," "second," etc. may also be interchanged with one another.
As shown in fig. 1 to 9, according to the control valve of the embodiment of the present invention, the driven plunger 25 of the flow capacity adjusting mechanism 20 of the control valve is connected to the valve body 31 of the valve 30, and the slide bar 24 of the flow capacity adjusting mechanism 20 is connected to the actuator 40. The actuator 40 drives the slide bar 24 to horizontally translate, and drives the driven ejector rod 25 to drive the valve core 31 of the valve 30 to longitudinally move so as to adjust the opening of the valve 30.
As shown in fig. 1 to 9, the circulation capacity adjusting mechanism 20 according to the embodiment of the present invention includes an L-shaped connection block 21, in which an eccentric 22 is provided at a bent portion thereof, and the eccentric 22 is provided with a bar-shaped through hole 221. The rectangular shaft 23 is inserted into the bar-shaped through hole 221, the two ends of the rectangular shaft 23 are outwardly extended with the rotating shaft parts 231, and the rectangular shaft 23 and the eccentric wheel 22 can relatively move along the long side direction of the bar-shaped through hole 221, thereby changing the eccentric distance e of the eccentric wheel 22. The slide bar 24 is connected to an end of the first arm 211 of the L-shaped connection block 21. The lower end surface of the driven ejector rod 25 is tangent to and abutted against the eccentric wheel 22. The slide bar 24 horizontally translates and drives the L-shaped connecting block 21 to rotate around the rotating shaft part 231, and the rectangular shaft 23 and the eccentric wheel 22 synchronously rotate with the L-shaped connecting block 21, so that the eccentric wheel 22 drives the driven ejector rod 25 to longitudinally move up and down. Further, in one or more exemplary embodiments of the present invention, the long sides of the bar-shaped through holes 221 extend in the direction of the second arm 212 of the L-shaped connection block 21.
Further, in one or more exemplary embodiments of the present invention, the flow-through capacity adjustment mechanism 20 is provided on the main frame 10. The main frame 10 includes a shaft hole 111 perpendicular to the slide bar 24, and a rotation shaft portion 231 of the rectangular shaft 23 is rotatably inserted into the shaft hole 111. The main frame 10 is provided with a first limiting portion 112, which limits an initial position of the sliding rod 24 in the lateral translation, and when the sliding rod 24 abuts against the first limiting portion 112, the long side of the strip-shaped through hole 221 is in the lateral direction. Further, in one or more exemplary embodiments of the present invention, the main frame 10 further includes a second limit portion 113 that limits the maximum position of the sliding rod 24 in the lateral translation.
Further, in one or more exemplary embodiments of the present invention, the throughput capability adjustment mechanism 20 further includes a lock reset assembly 26. The locking reset assembly 26 comprises a linkage rod 261 which is arranged in parallel with the driven ejector rod 25, and the top end of the linkage rod 261 is connected with the driven ejector rod 25 through a cross beam 262. The link lever 261 is externally provided with a return spring 263, the upper end of the return spring 263 is fixedly connected with the main frame 10, the lower end of the return spring 263 is fixedly connected to the link lever 261, and the return spring 263 is in a compressed state. The linkage rod 261 can be a stepped shaft rod, which is composed of three coaxial round rods with different diameters, wherein the round rod segment with the largest diameter at the upper end is connected with the cross beam 262, the reset spring 263 is fixed in the middle round rod segment through the spring washer 2632 and the fastening nut 2631, and the round rod segment with the smallest diameter at the lower end is connected with the valve core 31 of the valve 30 through the valve connector 50. The locking reset assembly 26 further includes a locking ram 264, which is a screw rod with a spherical dome at the lower end of the upper hexagonal head, and the locking ram 264 is supported at the upper end of the driven ram 25 through the cross beam 262. The return spring 263 applies a downward force to the link lever 261, and the link lever 261 applies a downward pressing force to the driven jack 25 through the cross beam 262 and the lock jack 264 according to the force transmission characteristic. The driven ejector rod 25 applies downward pressing force to the eccentric wheel 22, the axis of the driven ejector rod 25 is at the position of the central shaft of the rotating shaft part 231 to the left, the eccentric wheel 22 deflects the L-shaped connecting block 20 anticlockwise under the action of the pressing force and drives the sliding rod 24 to translate rightwards until the eccentric wheel is abutted against the sliding rod 24 and the limiting ejector rod 1121 of the first limiting part 112, so that the whole mechanism is locked, and all parts are tightly adhered to each other and interact under the action of the elastic force of the reset spring 263. The actuator 40 drives the slide bar 24 to produce any minute translation which will sensitively react to the linkage bar 261, producing corresponding longitudinal displacement and changes in force, making the control valve of the present invention very sensitive. When the actuator 40 drives the slide bar 24 to translate leftwards, the L-shaped connecting block 21 rotates clockwise, and the driven ejector rod 25 drives the linkage rod 261 to drive the valve core 31 to translate upwards under the drive of synchronous rotation of the eccentric wheel 22, so that the opening of the valve is increased. When the actuator 40 drives the slide bar 24 to translate rightwards, the L-shaped connecting block 21 rotates reversely, the linkage rod 261 drives the valve core 31 to translate downwards under the action of the elastic force of the reset spring 263, the opening degree of the valve is reduced, and meanwhile, the locking ejector rod 264 is driven to press the driven ejector rod 25, so that the circulation capacity adjusting mechanism 20 is kept in a locking state.
Further, in one or more exemplary embodiments of the present invention, the main body 11 of the main frame 10 is a right trapezoid channel having an approximately hypotenuse open structure. The vertical back plate 13 divides the main body 11 into two parts, a part is provided with a cover plate 12, and shaft holes 111 are provided on the cover plate 12 and the vertical back plate 13 for mounting the rotation shaft portions 231. The cover plate 12 is fixed at both ends to the front end surface of the main body 11 by four fixing bolts. The right-angle side and the opposite side of the trapezoid structure of the main body 11 are respectively provided with a second limiting part 113 and a first limiting part 112, and the first limiting part 112 is provided with a limiting ejector rod 1121. The limiting jack 1121 may be a limiting screw, and the initial position of the L-shaped connection block 21 is adjusted to be in the transverse direction of the bar-shaped through hole 221 by rotating the limiting jack 1121. The driven jack 25 passes through the upper base of the trapezoid structure of the main body 11. The linkage rod 261 of the locking reset assembly 26 is connected with the driven ejector rod 25 through a cross beam 262, the linkage rod 261 is arranged at the other part of the main body 11, and the linkage rod 261 is connected with the valve core 31 of the valve 30.
Further, in one or more exemplary embodiments of the present invention, the eccentric 22 is provided with a screw through hole communicating with one end of the bar-shaped through hole 221, and an adjusting screw 271 is provided therein, and rotating the adjusting screw 271 can drive the eccentric 22 to move in a long side direction of the bar-shaped through hole 221, thereby adjusting the eccentricity e of the eccentric 22. Further, in one or more exemplary embodiments of the present invention, the outer end of the adjusting screw 271 is provided with a limiting shaft lever 272, the limiting shaft lever 272 is rotatably clamped on the second arm 212 of the L-shaped connecting block 21, the outer end of the limiting shaft lever 272 is connected with an adjusting hand wheel 273, and the adjusting hand wheel 273 drives the limiting shaft lever 272 and the adjusting screw 271 to rotate, so as to drive the eccentric wheel 22 to move.
Further, in one or more exemplary embodiments of the present invention, the top surface of the second arm 212 of the L-shaped connection block 21 is horizontal, a round bottom clamping groove 2121 for installing the adjusting screw 271 is provided, a round bottom shoulder 2122 may be provided at the bottom of the round bottom clamping groove 2121, and the limiting shaft 272 may be a dumbbell-shaped shaft, and the middle part may be clamped on the round bottom shoulder 2122 for limiting. The inside of adjustment hand wheel 273 can set up square axostylus axostyle 274 and spacing axostylus axostyle 272 fixed connection, and the outer end of adjustment hand wheel 273 can also lock through lock nut 275 for adjustment hand wheel 273 compresses tightly gasket 276 on the terminal surface of round bottom shoulder 2122. The spacer 276 is provided with a flange 2761 that interfaces with the lower edge of the second arm 212. A long hole 2111 is provided at the lower end of the first arm 211, and a central axis in the longitudinal direction of the long hole 2111 perpendicularly intersects with the axis of the rotating shaft 231. The slide bar 24 is provided with a pin 241, and the pin 241 is slidable in the elongated hole 2111.
Further, in one or more exemplary embodiments of the present invention, when the rectangular shaft 23 is located at any position in the middle of the bar-shaped through hole 221, the eccentric distance of the eccentric wheel 22 is e, the translation slide bar 24 drives the L-shaped connection block 21 to rotate by an angle α, and the driven ejector rod 25 longitudinally displaces by e×sin α. When the rectangular shaft 23 abuts against the end of the strip-shaped through hole 221, which is closer to the bending position, the axis of the rotating shaft 231 coincides with the central axis of the eccentric wheel 22, at this time, the eccentric distance of the eccentric wheel 22 is zero, the translation sliding rod 24 drives the L-shaped connecting block 21 to rotate by an angle α, and the driven ejector rod 25 does not longitudinally displace. When the rectangular shaft 23 is abutted against the end of the bar-shaped through hole 221 far from the bending position, the distance between the axis of the rotating shaft 231 and the central axis of the eccentric wheel 22 is the largest, and the eccentricity of the eccentric wheel 22 reaches the maximum value e max The translation slide bar 24 drives the L-shaped connecting block 21 to rotate by an angle alpha, and the driven ejector rod 25 longitudinally displaces to be e max X sin alpha. In the middle position of the bar-shaped through hole 221, the eccentric distance of the eccentric wheel 22 is e max 2, the translation slide bar 24 drives the L-shaped connecting block 21 to rotate by an angle alpha, and the driven ejector rod 25 longitudinally displaces to (e) max 2). Times.sin alpha. By adjusting the relative position of the screw 271, the deformation axis 23 and the bar-shaped through hole 221 can be changed to obtain 0~e max Thereby adjusting the range of different longitudinal displacements of the driven ejector rod 25. Longitudinal displacement of driven ejector rod 25Can be converted into the lift height of the spool 31 of the valve 30, thereby changing the flow capacity of the valve 30. In the initial position, the long sides of the rectangular shaft 23 are transversely arranged, the strip-shaped through holes 221 of the eccentric wheel 22 are also transversely arranged, and when the eccentricity of the eccentric wheel 22 is adjusted, the transverse movement of the eccentric wheel 22 cannot cause the longitudinal displacement of the driven ejector rod 25, so that the initial position of the valve core 31 is not influenced. Further, in one or more exemplary embodiments of the present invention, the bottom end of the driven jack 25 is provided with a platform 251.
Illustratively, the same actuator 40 drive stroke, increasing the structural length of the first arm 211 of the L-shaped connection block 21 results in a smaller deflection angle, further reducing the longitudinal displacement of the driven ram 25, thereby reducing the lift height of the spool 31, resulting in a more minimal spool motion and higher force. Therefore, the present invention can improve the control accuracy of the valve 30 by increasing the structural length of the first arm 211 of the L-shaped connection block 21, thereby achieving more accurate minute flow control.
Illustratively, in one or more exemplary embodiments of the invention, the valve 30 includes a valve body 32, a valve spool 31, a packing press cap 33, a packing press ring 34, a sealing packing 35, a packing support ring 36. The valve body 32 is provided with a material inlet 322, a material outlet 323 and a mounting flange 324. The valve seat 321 and the valve core 31 are positioned in the inner cavity of the valve body 32, the valve seat 321 is a conical hole on the central axis of the valve body 32, the lower end of the valve core 31 is a conical valve needle 311, and the upper end of the valve core 31 is connected with the linkage rod 261 through the valve connector 50. The valve needle 311 of the valve core 31 is partially inserted into the center of the valve seat 321, the conical surface of the valve seat 321 is the same as the conical shape of the valve needle 311, and the valve seat 321 and the valve needle 311 are matched between the material inlet 322 and the material outlet 323 to form a throttling device. The distance between the linkage rod 261 and the valve core 31 can be adjusted by the valve connector 50 so that the valve 30 is just in the closed state when the flow capacity adjustment mechanism 20 is in the initial position. The valve core 31 and the valve body 32 are sealed by a sealing filler 35; the packing support ring 36 is arranged below the sealing packing 35 and plays a supporting role; the packing pressing ring 34 is arranged above the sealing packing 35, the packing pressing cap 33 is matched with a threaded hole at the upper end of the valve body 32, and the sealing packing 35 is pressed by the packing pressing ring 34 to seal. The upper end mounting flange 324 of the valve body 32 is connected with the main body 11 of the main frame 10, so that the valve core 31 of the valve 30 and the linkage rod 261 are coaxially arranged. The valve 30 of the control valve of the present invention may be a conventional high-pressure valve structure, the valve core 31 may be a conventional long tapered valve needle 311 and a valve seat 321 for controlling small flow, and it should be understood that the present invention is not limited thereto, and those skilled in the art may also select other suitable existing small flow valves.
Illustratively, in one or more exemplary embodiments of the present invention, the actuator 40 may be a relatively long stroke, spring-loaded, reaction piston actuator that is capable of translating small amplitude changes in the controller output signal into as large a stroke change of the actuator as possible, thereby more effectively driving the throughput capability adjustment mechanism 20 to achieve precise control of minute flow rates. It should be understood that the present invention is not limited thereto, and that other forms and stroke length actuators may be used by those skilled in the art; a change in the range of travel of the actuator will change the maximum travel that the valve spool can achieve and ultimately the maximum flow capacity of the valve.
Example 1
In the present embodiment, the valve 30 is a linear valve, the distance between the center of the elongated hole 2111 and the central axis of the shaft 231 is 196mm, and the maximum eccentric distance of the eccentric wheel 22 is e max =16mm, the actuator 40 is a piston actuator, with a maximum stroke of 100mm. At the maximum stroke position of the actuator 40, the maximum deflection angle of the L-shaped connection block 21 is 30 °. The adjusting screw 271 is rotated to make the rectangular shaft 23 contact with the end of the bar-shaped through hole 221 far from the bending position, and the eccentric distance of the eccentric wheel 22 reaches the maximum value e max When =16 mm, the maximum stroke of the valve body 31 is 16×sin 30+=8 mm, and the maximum flow capacity of the valve 30 is 0.06. Rotating the adjustment screw 271 so that the eccentricity e=e of the eccentric 22 max 2=8 mm, the maximum travel of the valve 30 is 8×sin30 ° =4mm, and the maximum flow capacity of the valve 30 is 0.03.
It can be seen that the control valve of the present invention can change the flow capacity of the valve 30 by adjusting the eccentricity of the eccentric 22 to accommodate different process conditions; the center of the elongated hole 2111 and the shaft 231The distance of the central axis is much larger than the adjustment range of the eccentricity (i.e. e max ) According to the lever transmission characteristic, the long stroke and the low acting force of the actuator 40 transmitted by the slide rod 24 are converted into the high acting force of the valve core 31 under the tiny stroke, so that the influence of unbalanced force and friction force under severe working conditions is effectively overcome, and the steady control of tiny flow is realized through tiny opening or acting force change.
Example 2
In this embodiment, as shown in fig. 10, the valve of the control valve is a conventional high-pressure valve 60, the flow characteristic curve of which is linear, the stroke of the valve core is 0-9 mm, and the corresponding flow capacity is 0-0.18. The high-pressure valve 60 is fixed to the main frame 10 by providing the adapter frame 61 so that the spool is coaxial with the link lever 261.
The eccentricity of the eccentric wheel is adjusted to 6mm by rotating the adjusting screw 271, and the maximum deflection angle is 30 °, so that the maximum stroke of the driven ejector rod 25 is 6×sin30 ° =3mm, the maximum lifting height of the valve core is 3mm, and the corresponding circulation capacity is adjusted to 0 to 0.06.
The eccentricity of the eccentric wheel is adjusted to 0.6mm by rotating the adjusting screw 271, the maximum deflection angle is 30 degrees, then the maximum stroke of the driven ejector rod 25 is 0.6×sin30 degrees=0.3 mm, the maximum lifting height of the valve core is 0.3mm, the corresponding circulation capacity is adjusted to 0-0.006, and the micro-flow control valve is realized.
After the actuator and the flow capacity adjusting mechanism 20 are shaped, the control valve can be used for constructing a small flow control valve with required flow capacity by selecting the existing high-pressure valve 60 with proper flow capacity; it is also possible to construct a small flow control valve of desired flow capacity by adjusting the eccentricity e.
Example 3
In this embodiment, as shown in FIG. 10, the actuator 40 of example 1 is replaced with a diaphragm actuator 70 having a stroke of 30mm, and the eccentricity of the eccentric 22 reaches a maximum value e max When =16mm, the maximum stroke of the valve body 31 is about 16×sin9 ° =2.5 mm (the maximum deflection angle is about 9 °), and the maximum flow capacity of the valve 30 is 0 to 0.019.
After the valve and flow capacity adjustment mechanism 20 of the present invention is set, the control valve of different maximum flow capacities may be constructed by selecting actuators of different strokes. As shown in fig. 10, a diaphragm actuator 70 and a shortened-length actuator support 71 are employed. The valve positioner 72 is disposed to improve the operation speed and positioning accuracy of the diaphragm actuator 70, and the valve positioner 72 is fixed to the outside of the main frame 10 by a valve positioner bracket 721.
The foregoing descriptions of specific exemplary embodiments of the present invention are presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application to thereby enable one skilled in the art to make and utilize the invention in various exemplary embodiments and with various modifications as are suited to the particular use contemplated. Any simple modifications, equivalent variations and modifications of the above-described exemplary embodiments should fall within the scope of the present invention.
Claims (13)
1. A flow-through capacity adjustment mechanism, comprising:
the bending part of the L-shaped connecting block is provided with an eccentric wheel, and the eccentric wheel is provided with a strip-shaped through hole;
the rectangular shaft penetrates through the strip-shaped through hole, two ends of the rectangular shaft are outwards extended to form rotating shaft parts, and the rectangular shaft and the eccentric wheel can relatively move along the long side direction of the strip-shaped through hole, so that the eccentric distance e of the eccentric wheel is changed;
a slide bar connected with an end of the first arm of the L-shaped connecting block; the end part of the first arm is provided with a strip hole, the central axis of the length direction of the strip hole is vertically intersected with the axis of the rotating shaft part, the sliding rod is provided with a pin shaft, and the pin shaft can slide in the length direction in the strip hole; and
the lower end surface of the driven ejector rod is tangent with the eccentric wheel and is abutted against the eccentric wheel,
the sliding rod horizontally moves to drive the L-shaped connecting block to rotate around the rotating shaft part, and the eccentric wheel drives the driven ejector rod to longitudinally move up and down.
2. The throughput capability adjustment mechanism of claim 1, further comprising a main frame, the main frame comprising:
the shaft hole is perpendicular to the sliding rod, and the rotating shaft part of the rectangular shaft is rotatably arranged in the shaft hole in a penetrating way; and
and the first limiting part is used for limiting the initial position of the sliding rod in the transverse translation, and when the sliding rod is abutted against the first limiting part, the long side of the strip-shaped through hole is in the transverse direction.
3. The throughput capability adjustment mechanism of claim 2, wherein the main frame further comprises:
and the second limiting part limits the maximum position of the sliding rod in the transverse translation.
4. The throughput capability adjustment mechanism of claim 2, further comprising a lock reset assembly comprising:
the linkage rod is arranged in parallel with the driven ejector rod;
the cross beam is used for connecting the top end of the linkage rod with the driven ejector rod; and
the reset spring is sleeved outside the linkage rod, the upper end of the reset spring is fixedly connected with the main frame, the lower end of the reset spring is fixedly connected to the linkage rod, and the reset spring is in a compressed state.
5. The throughput capability adjusting mechanism according to claim 2, wherein the eccentric is provided with an adjusting screw that drives the eccentric to move in a longitudinal direction of the bar-shaped through hole to adjust the eccentricity e of the eccentric.
6. The circulation capacity adjustment mechanism according to claim 5, wherein a limit shaft lever is provided at an outer end of the adjustment screw, the limit shaft lever is rotatably clamped on the main frame, an outer end of the limit shaft lever is connected with an adjustment hand wheel, and the adjustment hand wheel drives the limit shaft lever and the adjustment screw to rotate, so as to drive the eccentric wheel to move.
7. The flow-through capacity adjustment mechanism as set forth in claim 1, wherein the eccentricity of the eccentric is zero when the rectangular shaft is abutted against the end of the through-hole that is closer to the bend, and the eccentricity of the eccentric is maximum e when the rectangular shaft is abutted against the end of the through-hole that is farther from the bend max 。
8. The flow-through capacity adjustment mechanism as set forth in claim 7, wherein when the L-shaped connection block is rotated about the shaft portion by an angle α, the longitudinal displacement of the driven jack is e×sin α.
9. The flow-through capacity adjustment mechanism of claim 1, wherein the long edge of the bar-shaped through hole extends in the direction of the second arm of the L-shaped connection block.
10. The flow-through capacity adjustment mechanism of claim 1, wherein the bottom end of the driven ram is provided with a platform portion.
11. A control valve, comprising:
the flow-through capacity adjustment mechanism according to any one of claims 1 to 10;
the valve core of the valve is connected with the driven ejector rod of the flow capacity adjusting mechanism; and
an actuator connected to the slide bar of the flow capacity adjustment mechanism,
the actuator drives the sliding rod to horizontally translate, and drives the driven ejector rod to drive the valve core of the valve to longitudinally move so as to adjust the opening of the valve.
12. The control valve of claim 11 wherein the valve is a high pressure valve and the spool comprises a conical valve needle.
13. The control valve of claim 11, wherein the actuator is a piston actuator or a diaphragm actuator.
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| CN202010932075.9A CN114151599B (en) | 2020-09-08 | 2020-09-08 | Control valve and flow capacity adjusting mechanism thereof |
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| CN202010932075.9A CN114151599B (en) | 2020-09-08 | 2020-09-08 | Control valve and flow capacity adjusting mechanism thereof |
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Effective date of registration: 20231227 Address after: 100728 No. 22 North Main Street, Chaoyang District, Beijing, Chaoyangmen Applicant after: CHINA PETROLEUM & CHEMICAL Corp. Applicant after: Sinopec (Dalian) Petrochemical Research Institute Co.,Ltd. Address before: 100728 No. 22 North Main Street, Chaoyang District, Beijing, Chaoyangmen Applicant before: CHINA PETROLEUM & CHEMICAL Corp. Applicant before: DALIAN RESEARCH INSTITUTE OF PETROLEUM AND PETROCHEMICALS, SINOPEC Corp. |
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