CN117329189A - Follow-up pilot water-based proportional valve - Google Patents
Follow-up pilot water-based proportional valve Download PDFInfo
- Publication number
- CN117329189A CN117329189A CN202311315461.3A CN202311315461A CN117329189A CN 117329189 A CN117329189 A CN 117329189A CN 202311315461 A CN202311315461 A CN 202311315461A CN 117329189 A CN117329189 A CN 117329189A
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- Prior art keywords
- pilot
- valve
- valve core
- section
- cavity
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
- F15B13/043—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves
- F15B13/0435—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves the pilot valves being sliding valves
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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
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/36—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor
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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
- F16K31/12—Actuating devices; Operating means; Releasing devices actuated by fluid
- F16K31/36—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor
- F16K31/40—Actuating devices; Operating means; Releasing devices actuated by fluid in which fluid from the circuit is constantly supplied to the fluid motor with electrically-actuated member in the discharge of the motor
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Fluid-Driven Valves (AREA)
Abstract
The follow-up pilot water-based proportional valve according to the present invention comprises: the valve body is provided with a valve cavity, a valve inlet, a valve outlet, a first liquid inlet channel, a second liquid inlet channel and a first liquid return channel; the main valve core and the valve body define a first control cavity, a second control cavity and a liquid return cavity, a first liquid inlet duct is communicated with the first control cavity, a second liquid inlet duct is communicated with the second control cavity, the main valve core comprises a plugging section and a driving section, the driving section is positioned on one side of the plugging section, which is away from the valve body cavity, in a first direction, and the driving section is provided with a first acting surface and a second acting surface, which are opposite in the first direction; the pilot valve core is slidably arranged in the first inner hole along the first direction; the lever is positioned at the outer side of the valve body and can rotate relative to the valve body; and the driving device can drive the pilot valve core to move in the first direction. Therefore, the follow-up pilot water-based proportional valve has the advantages of simple structure and easiness in realizing proportional control.
Description
Technical Field
The invention relates to the technical field of valves, in particular to a follow-up pilot water-based proportional valve.
Background
In the related art, the follow-up pilot control valve can realize the proportional control function of the valve port under the condition of not arranging a valve core displacement sensor, but is mainly used for oil-based hydraulic products, and has few schemes suitable for water-based scenes. In addition, the processing difficulty of the spiral groove of the follow-up pilot valve is high, and the cost is high. Because the hydraulic pressure born by the main valve core and the pilot valve core is not always balanced, a certain pressure ratio relation needs to be met in order to keep balance, and therefore the main valve port is not opened or closed in the working process, and further the impact and the shake of the system are caused; the hydraulic pressure born by the two ends of the pilot valve core is not always balanced, and one side is high pressure and the other side is low pressure, so that redundant hydraulic pressure is balanced by a mechanical structure of a nut screw, and the service life of the screw is adversely affected; the main valve core adopts a slide valve form, is generally suitable for medium and small flow systems, and is no longer suitable for high flow systems. Or the follow-up pilot control valve adopts the control principle of a follow-up ball valve, the position of the main valve core is directly fed back to the opening of the pilot ball valve, and when the main valve core is disturbed by uncertain load, the position fluctuation of the main valve core can cause the pilot ball valve to be opened, so that the position disturbance rejection capability of the liquid inlet valve core is insufficient under the principle. In addition, the main valve core, the pilot liquid inlet valve core and the pilot liquid return valve core require three-core follow-up, the precision requirements of the processing and the matching of parts are higher, and the processing difficulty is high. In addition, if the liquid inlet valve core rotates, the side shearing force acts on the pilot push rod, and the service life is not good.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems in the related art to some extent.
For this purpose, the embodiment of the invention provides a follow-up pilot water-based proportional valve.
According to an embodiment of the invention, a follow-up pilot water-based proportional valve comprises:
the valve body is provided with a valve cavity, a valve inlet, a valve outlet, a first liquid inlet channel, a second liquid inlet channel and a first liquid return channel;
a main valve core slidably disposed in the valve body along a first direction so that the main valve core has a closed position and an open position, the main valve core and the valve body define a first control chamber, a second control chamber and a liquid return chamber, the first liquid inlet channel is communicated with the first control chamber, the second liquid inlet channel is communicated with the second control chamber, liquid can be introduced into the first control chamber from the first liquid inlet channel, liquid can be introduced into the second control chamber from the second liquid inlet channel, liquid in the liquid return chamber can be discharged from the first liquid return channel, wherein the main valve core comprises
The blocking section stretches into the valve cavity and blocks the valve inlet and the valve outlet in the closed position, and the valve inlet, the valve cavity and the valve outlet are sequentially communicated in the open position;
the driving section is positioned at one side of the plugging section, which is away from the valve body cavity, in the first direction, the driving section is provided with a first acting surface and a second acting surface, which are opposite in the first direction, the first acting surface is positioned in the first control cavity, the second acting surface is positioned in the second control cavity, a first inner hole is formed at one side of the driving section, which is away from the plugging section, the first inner hole extends along the first direction, and the first inner hole is communicated with the first control cavity, the second control cavity and the liquid return cavity;
the pilot valve core is slidably arranged in the first inner hole along the first direction, so that the pilot valve core has a first position and a second position, the first control cavity is communicated with the liquid return cavity in the first position, so that liquid in the second control cavity pushes the second acting surface and enables the main valve core to move towards the closed position, and the second control cavity is communicated with the liquid return cavity in the second position, so that liquid in the first control cavity pushes the first acting surface and drives the main valve core to move towards the open position;
and the driving device can drive the pilot valve core to move in the first direction.
Therefore, the follow-up pilot water-based proportional valve provided by the embodiment of the invention has the advantages of simple structure and easiness in realizing proportional control.
In some embodiments, the driving means comprises
The lever is positioned at the outer side of the valve body, the lever can rotate relative to the valve body, the lever is positioned at one side of the driving section, which is opposite to the plugging section, in the first direction, the lever comprises a first matching section and a second matching section, and when the lever rotates, the first matching section can drive the pilot valve core to move in the first direction;
the driving part is matched with the second matching section and can drive the lever to rotate for the second time, and the distance between the second matching section and the rotation axis of the lever is greater than that between the first matching section and the rotation axis of the lever.
In some embodiments, the driving means comprises
The driving part is movably arranged on the driver in a first direction, the driving part is propped against one side of the lever, which faces the valve body, the driver can drive the driving part to move in the first direction along a direction away from the plugging section, a pin hook is arranged on the pilot valve core, and the pin hook is hung on one side of the lever, which faces away from the valve body;
the elastic piece is positioned in the valve body, the elastic piece can elastically deform in the first direction, two ends of the elastic piece in the first direction are respectively connected with the valve body and the pilot valve core, and the elastic piece can drive the pilot valve core to move in the first direction along the direction adjacent to the plugging section.
In some embodiments, a turntable is arranged at one end of the valve body in the first direction, the lever is rotatably arranged on the turntable, and the extending direction of the rotation axis of the lever is a second direction;
the driver is positioned on one side of the valve body away from the rotary table in a third direction, the pilot valve core is positioned between the driver and the rotary table in the third direction, and any two of the first direction, the second direction and the third direction are perpendicular to each other.
In some embodiments, the pilot spool includes
The pilot valve core body extends along the first direction and is slidably arranged in the first inner hole along the first direction;
the driving rod extends along the first direction, the driving rod is slidably arranged on the valve body along the first direction, a first end of the driving rod stretches into the first inner hole and is connected with the pilot valve core body, a second end of the driving rod is located outside the valve body, the pin hook is arranged on the second end of the driving rod, the elastic piece is arranged on the periphery of the driving rod in a surrounding mode, and the elastic piece abuts against the end face of the pilot valve core body, which faces the driving rod.
In some embodiments, the pilot spool body separates the first bore into a first bore and a second bore, the second bore is located on a side of the pilot spool body adjacent to the plugging section, the pilot spool has a flow guiding bore, and the second bore, the flow guiding bore, the first bore, and the liquid return chamber are sequentially communicated;
the driving section is provided with a first pilot duct and a second pilot duct, the first control cavity is communicated with the first duct through the first pilot duct in the first position, the pilot valve core body is used for blocking the second pilot duct, the second control cavity is communicated with the second duct through the second pilot duct in the second position, and the pilot valve core body is used for blocking the first pilot duct.
In some embodiments, the peripheral side of the pilot spool body is provided with a plurality of sealing rings, the plurality of sealing rings are arranged at intervals in the first direction, in the first position, the outlet of the second pilot duct is positioned between the two sealing rings, and in the second position, the outlet of the first pilot duct is positioned between the two sealing rings.
In some embodiments, the plurality of sealing rings includes a first sealing ring, a second sealing ring, and a third sealing ring, the first sealing ring, the second sealing ring, and the third sealing ring being sequentially disposed in a direction away from the plugging segment in the first direction, the pilot spool further having a third position in which the outlet of the second pilot port is located between the first sealing ring and the second sealing ring, and the outlet of the first pilot port is located between the second sealing ring and the third sealing ring.
In some embodiments, the area of the second active surface is equal to or greater than the area of the first active surface;
the first liquid inlet duct and the second liquid inlet duct are communicated with a liquid inlet pipe with a damper;
the valve body is internally provided with a valve seat, the valve seat is limited into the valve body cavity, the valve seat is provided with a first conical surface, one end of the plugging section, which is opposite to the driving section, is provided with a second conical surface, the diameter of the first conical surface and the diameter of the second conical surface are increased along the direction adjacent to the driving section in a first direction, the first conical surface is matched with the second conical surface, the first conical surface is abutted to the second conical surface in the closed position, and the first conical surface is arranged at an interval with the second conical surface in the open position.
In some embodiments, a balancing shoulder is provided at an end of the plug section facing away from the drive section, the balancing shoulder being connected to the plug section by a valve stem, the balancing shoulder being slidably disposed within the valve seat.
Drawings
FIG. 1 is a schematic diagram of a follow-up pilot water-based proportional valve in accordance with an embodiment of the present invention.
Reference numerals:
the valve comprises a valve body 1, a valve body cavity 11, a valve inlet 12, a valve outlet 13, a first liquid inlet duct 14, a second liquid inlet duct 15, a first liquid return duct 16, a first control cavity 17, a second control cavity 18 and a liquid return cavity 19;
the valve comprises a main valve core 2, a plugging section 21, a second conical surface 211, a driving section 22, a first inner hole 23, a first pore canal 231, a second pore canal 232, a first acting surface 24, a second acting surface 25, a first pilot pore canal 26, a second pilot pore canal 27, a balance shoulder 28 and a valve rod 281;
the pilot valve core 3, a pilot valve core body 31, a driving rod 32, a diversion duct 33 and a pin hook 34;
the lever 4, the first mating section 41, the second mating section 42, the turntable 43;
the driver 5, the driving part 51, the first sealing ring 52, the second sealing ring 53 and the third sealing ring 54;
an elastic member 6;
a valve seat 7, a first tapered surface 71, a first opening 72;
and a liquid inlet pipe 8.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
The following description of the following pilot water-based proportional valve of the embodiment of the present invention refers to the accompanying drawings. As shown in fig. 1, the follow-up pilot water-based proportional valve according to the embodiment of the present invention includes a valve body 1, a main spool 2, a pilot spool 3, and a driving device.
The valve body 1 has a valve body chamber 11, a valve inlet 12, a valve outlet 13, a first inlet duct 14, a second inlet duct 15 and a first return duct 16. For example, liquid enters the feed line from port P and then passes into valve inlet 12. After the valve body chamber 11 is communicated, the liquid in the valve inlet 12 passes from the valve body chamber 11 into the valve outlet 13 and then out of the valve body 1.
The main spool 2 is slidably provided in the valve body 1 in a first direction such that the main spool 2 has a closed position and an open position. The main valve core 2 and the valve body 1 define a first control cavity 17, a second control cavity 18 and a liquid return cavity 19, the first liquid inlet pore canal 14 is communicated with the first control cavity 17, and the second liquid inlet pore canal 15 is communicated with the second control cavity 18. Liquid can be introduced into the first control chamber 17 from the first liquid inlet channel 14, liquid can be introduced into the second control chamber 18 from the second liquid inlet channel 15, and liquid in the liquid return chamber 19 can be discharged from the first liquid return channel 16.
The follow-up pilot water-based proportional valve is a proportional valve with infinite number of opening positions, and the farther the opening position(s) of the main valve core 2 are from the closing position of the main valve core 2 in the first direction, the larger the area of the through flow cross section, and the larger the opening and flow.
The main valve element 2 comprises a blocking section 21 and a drive section 22, wherein the drive section 22 is located on the side of the blocking section 21 facing away from the valve body chamber 11 in a first direction. The first direction may be a left-right direction, which is indicated by an arrow in the figure. For example, the drive section 22 is located to the right of the plugging section 21, the plugging position to the left of the open position, the plugging section 21 being moved to the right in order to reach the open position(s).
In the closed position, the blocking section 21 protrudes into the valve body chamber 11 and blocks the valve inlet 12 and the valve outlet 13, so that the valve inlet 12 and the valve outlet 13 are not connected. In the open position, the valve inlet 12, the valve body chamber 11 and the valve outlet 13 are in communication in sequence, whereby liquid in the valve inlet 12 can be caused to pass from the valve body chamber 11 into the valve outlet 13. For example, the main valve element 2 (blocking section 21) is movable to the left to a closed position, and the main valve element 2 (blocking section 21) is movable to the right to an open position.
The drive section 22 has a first active surface 24 and a second active surface 25 facing away from each other in a first direction, the first active surface 24 being located in the first control chamber 17 and the second active surface 25 being located in the second control chamber 18. Specifically, the first working surface 24 is directed in the first direction towards the plugging section 21 (valve body chamber 11), from a direction in which the liquid in the first control chamber 17 can push the first working surface 24 (driving section 22) away from the plugging section 21 (valve body chamber 11). The second working surface 25 faces away from the plugging section 21 (valve body chamber 11) in the first direction, so that the liquid in the second control chamber 18 can push the second working surface 25 (driving section 22) towards the adjacent plugging section 21 (valve body chamber 11). For example, the first working surface 24 is directed to the left, so that the liquid in the first control chamber 17 can push the first working surface 24 (the drive section 22) to move to the right. The second working surface 25 is directed to the right, whereby the liquid in the second control chamber 18 can push the second working surface 25 (the drive section 22) to move to the left.
The driving section 22 is provided with a first inner hole 23 on the side facing away from the plugging section 21, the first inner hole 23 extends along the first direction, and the first inner hole 23 is communicated with the first control cavity 17, the second control cavity 18 and the liquid return cavity 19. For example, the first inner hole 23 extends in the left-right direction, and the opening of the first inner hole 23 is directed to the right side.
The pilot spool 3 is slidably disposed within the first bore 23 in a first direction such that the pilot spool 3 has a first position and a second position. In the first position, the first control chamber 17 is communicated with the liquid return chamber 19 (the second control chamber 18 is not communicated with the liquid return chamber 19), the hydraulic pressure in the first control chamber 17 is reduced, the hydraulic pressure in the second control chamber 18 is unchanged, and the liquid in the second control chamber 18 pushes the second acting surface 25 under the action of the pressure difference and enables the main valve core 2 to move towards the closed position; in the second position, the second control chamber 18 is communicated with the liquid return chamber 19 (the first control chamber 17 is not communicated with the liquid return chamber 19), the hydraulic pressure in the second control chamber 18 is reduced, the hydraulic pressure in the first control chamber 17 is unchanged, and the liquid in the first control chamber 17 pushes the first acting surface 24 and drives the main valve core 2 to move towards the opening position under the action of the pressure difference.
For example, the pilot spool 3 is slidably provided in the first inner bore 23 in the left-right direction, and the pilot spool 3 is movable to the left in the first inner bore 23 (relative to the main spool 2) to reach the first position, and the pilot spool 3 is movable to the right in the first inner bore 23 (relative to the main spool 2) to reach the second position. The pilot spool 3 moves to the left to the first position, the first control chamber 17 communicates with the return chamber 19 so that the liquid in the second control chamber 18 pushes the second active surface 25 and moves the main spool 2 to the closed position (left). The pilot spool 3 moves to the right to the second position, and the second control chamber 18 communicates with the return chamber 19, so that the liquid in the first control chamber 17 pushes the first acting surface 24 and drives the main spool 2 to move to the open position (right side).
The driving device can drive the pilot valve core 3 to move in the first direction. For example, the driving device may drive the pilot spool 3 to move a predetermined distance between the first position and the second position (in the left-right direction).
Therefore, the follow-up pilot water-based proportional valve provided by the embodiment of the invention has the advantages of simple structure and easiness in realizing proportional control.
As shown in fig. 1, in some embodiments, the drive means comprises a lever 4 and a drive portion 51.
The lever 4 is located outside the valve body 1, the lever 4 can rotate relative to the valve body 1, and the lever 4 is located on the side of the driving section 22, which faces away from the plugging section 21, in the first direction. The lever 4 includes a first mating segment 41 and a second mating segment 42, and the first mating segment 41 drives the pilot spool 3 to move in a first direction when the lever 4 rotates. For example, when the lever 4 rotates, the first matching section 41 may drive the pilot valve core 3 to move between the first position and the second position (in the left-right direction), and the lever 4 is located on the right side of the valve body 1.
The driving part 51 is matched with the second matching section 42 and can drive the lever 4 to rotate. The second mating segment 42 is spaced from the axis of rotation of the lever 4 by a greater distance than the first mating segment 41. Thereby, the arm of force of the driving portion 51 can be made larger than the arm of force of the pilot spool 3, so that the force required for the driving portion 51 can be made small, so that the energy consumption (driving power) of the driving portion 51 can be reduced.
As shown in fig. 1, in some embodiments, the drive means comprises a driver 5 and an elastic member 6.
The driving portion 51 is provided on the actuator 5 so as to be movable in the first direction, and the driving portion 51 abuts against a side of the lever 4 toward the valve body 1 (the driving portion 51 is not mechanically hard-coupled to the lever 4). The driver 5 can drive the drive part 51 in a first direction in a direction away from the occlusion section 21, so that the drive part 51 pushes the lever 4 to rotate in the first direction in a direction away from the occlusion section 21. And the pilot valve core 3 is provided with a pin hook 34, and the pin hook 34 is hung on one side of the lever 4, which is opposite to the valve body 1, so that the lever 4 can drive the pin hook 34 and the pilot valve core 3 to move in a direction away from the plugging section 21 in a first direction. So that the pilot spool 3 moves to the second position and thus the main spool 2 (the plugging section 21) moves to the open position.
For example, the driver 5 is a proportional electromagnet, the driving unit 51 is a core of the proportional electromagnet, and the driving unit 51 moves rightward after the proportional electromagnet is energized. The driving portion 51 abuts on the left side of the lever 4. The driver 5 drives the driving part 51 to move rightward, so that the driving part 51 pushes the lever 4 to rotate rightward, and the lever 4 drives the pin hook 34 and the pilot valve core 3 to move rightward. The pilot spool 3 moves rightward to the second position, and the main spool 2 (the plugging section 21) moves rightward to the open position.
The elastic piece 6 is located in the valve body 1, the elastic piece 6 can elastically deform in the first direction, two ends of the elastic piece 6 in the first direction are respectively connected with the valve body 1 and the pilot valve core 3, and the elastic piece 6 can drive the pilot valve core 3 to move in the first direction along the direction adjacent to the plugging section 21. So that the pilot spool 3 can be moved to the first position (while the pin hook 34 brings the lever 4 to move in the first direction in the direction adjacent to the valve body 1). The elastic element 6 cooperates with the driver 5, and when the driver 5 (proportional electromagnet) is completely powered off, the main valve element 2 (blocking section 21) moves to the closed position; when the actuator 5 (proportional solenoid) is energized, the main valve element 2 (blocking section 21) is in the open position.
The elastic piece 6 realizes the reset function of the pilot valve core 3 in the fault or power-off emergency state, further realizes the reset closing of the main valve core 2, and has the safety self-protection function. The lever 4 and the elastic piece 6 realize the proportional control and low-power driving of the pilot valve core 3, and because the two sides of the pilot valve core 3 are low-pressure areas, the spring force of the elastic piece 6 and the friction force of the pilot valve 3 only need to be overcome when the lever 4 is driven, and the low-power requirement of the proportional electromagnet is easy to realize through the proportion of the lever 4. For example, the elastic member 6 may drive the pilot spool 3 to move leftward, so that the pilot spool 3 may be moved leftward to the first position (while the pin hook 34 drives the lever 4 to move leftward), and the main spool 2 (the plugging section 21) may be moved leftward to the closed position.
As shown in fig. 1, in some embodiments, one end of the valve body 1 in the first direction is provided with a turntable 43, the lever 4 is rotatably provided on the turntable 43, and the extending direction of the rotation axis of the lever 4 is the second direction. The actuator 5 is located on a side of the valve body 1 away from the turntable 43 in the third direction, and the pilot spool 3 is located between the actuator 5 and the turntable 43 in the third direction, any two of the first direction, the second direction, and the third direction being perpendicular to each other. The second direction may be a front-rear direction, and the third direction may be an up-down direction. For example, a turntable 43 is provided at the lower right end of the valve body 1, and the rotation axis of the lever 4 extends in the front-rear direction. The actuator 5 is located above the valve body 1, and the pilot spool 3 is located between the actuator 5 and the turntable 43 in the up-down direction.
As shown in fig. 1, in some embodiments, the pilot spool 3 includes a pilot spool body 31 and a drive rod 32.
The pilot spool body 31 extends in a first direction, and the pilot spool body 31 is slidably disposed within the first bore 23 in the first direction. For example, the pilot spool body 31 is a column extending in the left-right direction, and the pilot spool body 31 is slidably provided in the first inner bore 23 in the left-right direction.
The drive rod 32 extends in a first direction, and the drive rod 32 is slidably provided on the valve body 1 in the first direction. The first end of the driving rod 32 extends into the first inner hole 23 and is connected with the pilot valve core body 31, the second end of the driving rod 32 is located outside the valve body 1, and the pin hook 34 is arranged on the second end of the driving rod 32. The elastic member 6 is provided around the drive rod 32, and the elastic member 6 abuts against the end surface of the pilot spool body 31 facing the drive rod 32. Specifically, the outer diameter of the drive rod 32 is smaller than the outer diameter of the pilot spool body 31. For example, the drive lever 32 extends in the left-right direction, and the drive lever 32 is provided slidably in the left-right direction on the valve body 1. The left end of the driving rod 32 extends into the first inner hole 23 and is connected with the right end of the pilot valve core body 31, the right end of the driving rod 32 is located on the outer side of the valve body 1, and the pin hook 34 is arranged on the right end of the driving rod 32. An elastic member 6 (spring) is provided around the drive rod 32, and the left end of the elastic member 6 abuts against the right end surface of the pilot spool body 31.
As shown in fig. 1, in some embodiments, the pilot spool body 31 divides the first bore 23 into a first orifice 231 and a second orifice 232, the second orifice 232 is located on a side of the pilot spool body 31 adjacent to the plugging section 21, and the pilot spool 3 has a pilot orifice 33, and the second orifice 232, the pilot orifice 33, the first orifice 231, and the return chamber 19 are in communication in sequence. For example, the second duct 232, the diversion duct 33, the first duct 231, and the liquid return chamber 19 are communicated in this order from left to right.
The drive section 22 has a first pilot conduit 26 and a second pilot conduit 27. In the first position, the first control chamber 17 communicates with the first orifice 231 through the first pilot orifice 26, and the pilot spool body 31 (at the moment) blocks the second pilot orifice 27. In the second position, the second control chamber 18 is communicable with the second orifice 232 via the second pilot orifice 27, the pilot spool body 31 (at the moment) blocking the first pilot orifice 26.
For example, the pilot spool 3 moves leftward to the first position, the first control chamber 17, the first pilot port 26, the first port 231, the return chamber 19, and the first return port 16 are sequentially communicated, and the liquid in the first control chamber 17 can be discharged (the pressure is lowered), and the pilot spool body 31 blocks the second pilot port 27 (at this time). The liquid in the second control chamber 18 cannot be discharged (the pressure is unchanged), and the liquid pressure in the second control chamber 18 is higher than the liquid pressure in the first control chamber 17, so that the liquid in the second control chamber 18 can push the second acting surface 25 (the driving section 22) to move to the left, and the main valve core 2 is moved to the closed position (the left).
The pilot spool 3 moves rightward to the second position, and the second control chamber 18, the second pilot port 27, the second port 232, the pilot port 33, the first port 231, the liquid return chamber 19, and the first liquid return port 16 are sequentially communicated, and the pilot spool body 31 blocks the first pilot port 26 (at this time). The liquid in the first control chamber 17 cannot be discharged, and the liquid pressure in the first control chamber 17 is higher than the liquid pressure in the second control chamber 18, so that the liquid in the first control chamber 17 can push the first acting surface 24 (the driving section 22) to move to the right and the main valve core 2 to move to the open position (the right).
As shown in fig. 1, in some embodiments, the peripheral side of the pilot spool body 31 is provided with a plurality of seal rings, which are disposed at intervals in the first direction. In the first position, the outlet of the second pilot duct 27 is located between the two sealing rings. In the second position, the outlet of the first pilot port 26 is located between the two sealing rings. So that the sealing performance of the pilot spool body 31 can be made good so that the water-based medium can be introduced into the first control chamber 17 and the second control chamber 18.
As shown in fig. 1, in some embodiments, the plurality of sealing rings includes a first sealing ring 52, a second sealing ring 53, and a third sealing ring 54, with the first sealing ring 52, the second sealing ring 53, and the third sealing ring 54 being disposed in sequence in a first direction in a direction away from the plugging section 21. The pilot spool 3 also has a third position in which the outlet of the second pilot port 27 is located between the first and second sealing rings 52, 53 and the outlet of the first pilot port 26 is located between the second and third sealing rings 53, 54. Specifically, the third position is located between the first position and the second position, and the pilot spool 3 is in the third position, and the first pilot port 26 and the second pilot port 27 are both closed, i.e., at this time, the liquids in the first control chamber 17 and the second control chamber 18 are not discharged (the pressures in the first control chamber 17 and the second control chamber 18 are both the pressures of the port P of the system). For example, the third position may be an initial position in which the pilot spool 3 is in the third position and the main spool 2 is in the closed position. The first seal ring 52, the second seal ring 53, and the third seal ring 54 are provided in this order from left to right. Alternatively, the initial position may be the second position, where the pilot spool 3 is in the second position and the main spool 2 is in the closed position, so that the hydraulic pressure of the second control chamber 18 is greater than that of the first control chamber 17, and thus the main spool 2 has a larger sealing contact force under the action of the second control chamber 18, and reliable sealing is achieved.
In some embodiments, as shown in fig. 1, the area of the second active surface 25 is equal to or greater than the area of the first active surface 24. For example, the area of the second active surface 25 is larger than the area of the first active surface 24, so that the main spool 2 is in the closed position when the pilot spool 3 is in the third position. I.e. the effective active area of the second active surface 25 on the right is larger than the effective active area of the first active surface 24 on the left. Thus, under the same pressure, the closing force of the main valve core 2 is leftwards, and reliable sealing is realized.
In some embodiments, both the first and second inlet openings 14, 15 are in communication with the inlet tube 8 with a damper. Specifically, the damper is provided with a throttling small hole, and has the functions of limiting flow and reducing pressure. Liquid enters the liquid inlet pipe 8 with the damper from the K1 port and then is introduced into the first liquid inlet pore channel 14 (the first control cavity 17), and liquid enters the liquid inlet pipe 8 with the damper from the K2 port and then is introduced into the second liquid inlet pore channel 15 (the second control cavity 18). The pilot valve core 3 is additionally provided with three sealing (a first sealing ring 52, a second sealing ring 53 and a third sealing ring 54) in a structural form, so that the first control cavity 17, the second control cavity 18 and the flow guide pore canal 33 can be communicated, and the pressure of the first control cavity 17 and the pressure of the second control cavity 18 can be controlled by combining a damper. In the state of the third position and the second position, the sealing effect is better, and the sealing device is suitable for water-based media.
As shown in fig. 1, in some embodiments, a valve seat 7 is provided within the valve body 1, the valve seat 7 defining a valve body cavity 11. The valve seat 7 has a first conical surface 71 and the end of the plugging section 21 facing away from the driving section 22 has a second conical surface 211, the diameter of the first conical surface 71 and the diameter of the second conical surface 211 increasing in a first direction in a direction adjacent to the driving section 22. The first tapered surface 71 is adapted (disposed opposite) to the second tapered surface 211, and in the closed position, the first tapered surface 71 abuts against the second tapered surface 211, and in the open position, the first tapered surface 71 is disposed at an interval from the second tapered surface 211.
Specifically, the first tapered surface 71 faces the drive section 22, and the first tapered surface 71 and the second tapered surface 211 are adapted such that in the closed position, the blocking section 21 facilitates blocking the valve inlet 12 and the valve outlet 13. For example, the first tapered surface 71 faces the right side, and the left end of the plugging section 21 has a second tapered surface 211 facing the left side, and the diameter of the first tapered surface 71 and the diameter of the second tapered surface 211 increase rightward.
As shown in fig. 1, in some embodiments, the valve seat 7 is open on a side facing away from the lever 4 in a first direction so as to form a first opening 72. The end of the plugging section 21 facing away from the drive section 22 is provided with a balancing shoulder 28, the balancing shoulder 28 being connected to the plugging section 21 by a valve stem 281. A balance shoulder 28 is slidably disposed within the valve seat 7, the balance shoulder 28 sealing off the first opening 72. Specifically, the balance shoulder 28 and the shutoff section 21 are located on both sides of the valve outlet 13 in the first direction so that the liquid pressure at the valve outlet 13 presses against the balance shoulder 28 and the shutoff section 21, respectively, thereby reducing the influence of the liquid pressure at the valve outlet 13 on the main spool 2. For example, the valve seat 7 is left-side opened to form a first opening 72. The right end of the plugging section 21 is provided with a balancing shoulder 28.
In some embodiments, the first opening 72 communicates with the first return port 16.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the device or element being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.
In the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly, through intermediaries, or both, may be in communication with each other or in interaction with each other, unless expressly defined otherwise. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the present invention, unless expressly stated or limited otherwise, a first feature "up" or "down" a second feature may be the first and second features in direct contact, or the first and second features in indirect contact via an intervening medium. Moreover, a first feature being "above," "over" and "on" a second feature may be a first feature being directly above or obliquely above the second feature, or simply indicating that the first feature is level higher than the second feature. The first feature being "under", "below" and "beneath" the second feature may be the first feature being directly under or obliquely below the second feature, or simply indicating that the first feature is less level than the second feature.
For purposes of this disclosure, the terms "one embodiment," "some embodiments," "example," "a particular example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
While embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are illustrative and not to be construed as limiting the invention, and that variations, modifications, alternatives and variations may be made to the above embodiments by one of ordinary skill in the art within the scope of the invention.
Claims (10)
1. A follow-up pilot water-based proportional valve, comprising:
the valve body is provided with a valve cavity, a valve inlet, a valve outlet, a first liquid inlet channel, a second liquid inlet channel and a first liquid return channel;
a main valve core slidably disposed in the valve body along a first direction so that the main valve core has a closed position and an open position, the main valve core and the valve body define a first control chamber, a second control chamber and a liquid return chamber, the first liquid inlet channel is communicated with the first control chamber, the second liquid inlet channel is communicated with the second control chamber, liquid can be introduced into the first control chamber from the first liquid inlet channel, liquid can be introduced into the second control chamber from the second liquid inlet channel, liquid in the liquid return chamber can be discharged from the first liquid return channel, wherein the main valve core comprises
The blocking section stretches into the valve cavity and blocks the valve inlet and the valve outlet in the closed position, and the valve inlet, the valve cavity and the valve outlet are sequentially communicated in the open position;
the driving section is positioned at one side of the plugging section, which is away from the valve body cavity, in the first direction, the driving section is provided with a first acting surface and a second acting surface, which are opposite in the first direction, the first acting surface is positioned in the first control cavity, the second acting surface is positioned in the second control cavity, a first inner hole is formed at one side of the driving section, which is away from the plugging section, the first inner hole extends along the first direction, and the first inner hole is communicated with the first control cavity, the second control cavity and the liquid return cavity;
the pilot valve core is slidably arranged in the first inner hole along the first direction, so that the pilot valve core has a first position and a second position, the first control cavity is communicated with the liquid return cavity in the first position, so that liquid in the second control cavity pushes the second acting surface and enables the main valve core to move towards the closed position, and the second control cavity is communicated with the liquid return cavity in the second position, so that liquid in the first control cavity pushes the first acting surface and drives the main valve core to move towards the open position;
and the driving device can drive the pilot valve core to move in the first direction.
2. The follow-up pilot water-based proportioning valve of claim 1, wherein said drive means comprises
The lever is positioned at the outer side of the valve body, the lever can rotate relative to the valve body, the lever is positioned at one side of the driving section, which is opposite to the plugging section, in the first direction, the lever comprises a first matching section and a second matching section, and when the lever rotates, the first matching section can drive the pilot valve core to move in the first direction;
the driving part is matched with the second matching section and can drive the lever to rotate for the second time, and the distance between the second matching section and the rotation axis of the lever is greater than that between the first matching section and the rotation axis of the lever.
3. The follow-up pilot water-based proportioning valve of claim 2, wherein said drive means comprises
The driving part is movably arranged on the driver in a first direction, the driving part is propped against one side of the lever, which faces the valve body, the driver can drive the driving part to move in the first direction along a direction away from the plugging section, a pin hook is arranged on the pilot valve core, and the pin hook is hung on one side of the lever, which faces away from the valve body;
the elastic piece is positioned in the valve body, the elastic piece can elastically deform in the first direction, two ends of the elastic piece in the first direction are respectively connected with the valve body and the pilot valve core, and the elastic piece can drive the pilot valve core to move in the first direction along the direction adjacent to the plugging section.
4. The following pilot water-based proportioning valve of claim 3, wherein,
one end of the valve body in the first direction is provided with a rotary table, the lever is rotatably arranged on the rotary table, and the extending direction of the rotation axis of the lever is in the second direction;
the driver is positioned on one side of the valve body away from the rotary table in a third direction, the pilot valve core is positioned between the driver and the rotary table in the third direction, and any two of the first direction, the second direction and the third direction are perpendicular to each other.
5. A follow-up pilot water-based proportioning valve as set forth in claim 3 wherein said pilot spool comprises
The pilot valve core body extends along the first direction and is slidably arranged in the first inner hole along the first direction;
the driving rod extends along the first direction, the driving rod is slidably arranged on the valve body along the first direction, a first end of the driving rod stretches into the first inner hole and is connected with the pilot valve core body, a second end of the driving rod is located outside the valve body, the pin hook is arranged on the second end of the driving rod, the elastic piece is arranged on the periphery of the driving rod in a surrounding mode, and the elastic piece abuts against the end face of the pilot valve core body, which faces the driving rod.
6. The follow-up pilot water-based proportioning valve of claim 5, wherein,
the pilot valve core body divides the first inner hole into a first pore canal and a second pore canal, the second pore canal is positioned at one side of the pilot valve core body adjacent to the plugging section, the pilot valve core is provided with a diversion pore canal, and the second pore canal, the diversion pore canal, the first pore canal and the liquid return cavity are communicated in sequence;
the driving section is provided with a first pilot duct and a second pilot duct, the first control cavity is communicated with the first duct through the first pilot duct in the first position, the pilot valve core body is used for blocking the second pilot duct, the second control cavity is communicated with the second duct through the second pilot duct in the second position, and the pilot valve core body is used for blocking the first pilot duct.
7. The following-up pilot water-based proportional valve according to claim 6, wherein a plurality of seal rings are provided on a peripheral side of the pilot spool body, the plurality of seal rings being disposed at intervals in the first direction, and in the first position, the outlet of the second pilot port is located between the two seal rings, and in the second position, the outlet of the first pilot port is located between the two seal rings.
8. The follow-up pilot water-based proportioning valve of claim 7 wherein a plurality of said seal rings comprises a first seal ring, a second seal ring and a third seal ring, said first seal ring, said second seal ring and said third seal ring being disposed in sequence in a direction away from said plugging segment in said first direction, said pilot spool further having a third position in which an outlet of said second pilot port is located between said first seal ring and said second seal ring, and an outlet of said first pilot port is located between said second seal ring and said third seal ring.
9. The following pilot water-based proportioning valve of any of claims 1-8,
the area of the second acting surface is larger than or equal to that of the first acting surface;
the first liquid inlet duct and the second liquid inlet duct are communicated with a liquid inlet pipe with a damper;
the valve body is internally provided with a valve seat, the valve seat is limited into the valve body cavity, the valve seat is provided with a first conical surface, one end of the plugging section, which is opposite to the driving section, is provided with a second conical surface, the diameter of the first conical surface and the diameter of the second conical surface are increased along the direction adjacent to the driving section in a first direction, the first conical surface is matched with the second conical surface, the first conical surface is abutted to the second conical surface in the closed position, and the first conical surface is arranged at an interval with the second conical surface in the open position.
10. The following pilot water-based proportioning valve of claim 9 wherein an end of said shutoff segment facing away from said drive segment is provided with a balancing shoulder connected to said shutoff segment by a valve stem, said balancing shoulder slidably disposed within said valve seat.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311315461.3A CN117329189B (en) | 2023-10-11 | 2023-10-11 | Follow-up pilot water-based proportional valve |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311315461.3A CN117329189B (en) | 2023-10-11 | 2023-10-11 | Follow-up pilot water-based proportional valve |
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| CN117329189B CN117329189B (en) | 2026-08-04 |
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| CN119467726A (en) * | 2024-12-27 | 2025-02-18 | 北京天玛智控科技股份有限公司 | A load-sensitive water-based proportional directional control valve |
| CN119957697A (en) * | 2025-02-07 | 2025-05-09 | 北京天玛智控科技股份有限公司 | Pilot operated proportional valve |
| WO2025156716A1 (en) * | 2024-01-26 | 2025-07-31 | 北京天玛智控科技股份有限公司 | Three-position four-way directional control valve, control method, and control apparatus |
| WO2025256001A1 (en) * | 2024-06-12 | 2025-12-18 | 北京天玛智控科技股份有限公司 | Follow-up pilot proportional valve |
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| CN119957697B (en) * | 2025-02-07 | 2025-11-11 | 北京天玛智控科技股份有限公司 | Pilot follow-up proportional valve |
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|---|---|
| CN117329189B (en) | 2026-08-04 |
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