Follow-up pilot water-based proportional valve

Abstract

The follower-type pilot-operated water-based proportional valve according to the present invention includes: a valve body having a valve body cavity, a valve inlet, a valve outlet, a first inlet channel, a second inlet channel, and a first return channel; a main valve core defining a first control cavity, a second control cavity, and a return cavity with the valve body, the first inlet channel communicating with the first control cavity, and the second inlet channel communicating with the second control cavity, wherein the main valve core includes a blocking section and a driving section, the driving section being located on the side of the blocking section opposite to the valve body cavity in a first direction, and the driving section having a first working surface and a second working surface opposite to each other in the first direction; a pilot valve core slidably disposed in a first inner hole along the first direction; a lever located outside the valve body, the lever being rotatable relative to the valve body; and a driving device capable of driving the pilot valve core to move in the first direction. Therefore, the follower-type pilot-operated water-based proportional valve according to the present invention has the advantages of simple structure and easy proportional control.

Description

Technical Field

[0001] This invention relates to the field of valve technology, and specifically to a follow-up pilot water-based proportional valve. Background Technology

[0002] In related technologies, servo-driven pilot control valves can achieve proportional control of the valve port without the need for a valve core displacement sensor, but they are mainly used in oil-based hydraulic products, with few solutions suitable for water-based applications. Furthermore, the spiral groove of the servo-driven pilot valve is difficult and costly to machine. Also, because the hydraulic pressure on the main valve core and the pilot valve core is not always balanced, a certain pressure ratio is required to maintain balance. This causes the main valve port to open and close continuously during operation, leading to system shocks and vibrations. The hydraulic pressure on both ends of the pilot valve core is also not always balanced, with one side being high pressure and the other low pressure. Therefore, excess hydraulic pressure needs to be balanced by a nut and screw mechanical structure, which negatively impacts the lifespan of the screw. A spool valve for the main valve core is typically suitable for small to medium flow systems, but not for large flow systems. Alternatively, servo-driven pilot control valves use the control principle of a servo-driven ball valve, where the position of the main valve core is directly fed back to the opening of the pilot ball valve. When the main valve core is subjected to uncertain load disturbances, the position fluctuation of the main valve core will cause the pilot ball valve to open. Therefore, under this principle, the position of the inlet valve core has insufficient resistance to disturbances. Furthermore, the main valve core, pilot inlet valve core, and pilot return valve core require three-core follow-up, demanding high precision in the machining and fitting of these parts, making machining difficult. Additionally, if the inlet valve core rotates, it exerts a lateral shear force on the pilot push rod, which is detrimental to its lifespan. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the technical problems in the related art.

[0004] Therefore, embodiments of the present invention propose a follow-up pilot water-based proportional valve.

[0005] According to an embodiment of the present invention, a follow-up pilot water-based proportional valve includes:

[0006] The valve body has a valve body cavity, a valve inlet, a valve outlet, a first liquid inlet channel, a second liquid inlet channel, and a first liquid return channel;

[0007] A main valve core is slidably disposed within the valve body along a first direction, such 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 return chamber. A first inlet channel communicates with the first control chamber, and a second inlet channel communicates with the second control chamber. Liquid can flow into the first control chamber from the first inlet channel, and liquid can flow into the second control chamber from the second inlet channel. Liquid in the return chamber can be discharged from the first return channel. The main valve core includes...

[0008] In the closed position, the sealing section extends into the valve body cavity and isolates the valve inlet and the valve outlet; in the open position, the valve inlet, the valve body cavity, and the valve outlet are connected in sequence.

[0009] The driving section is located on the side of the sealing section opposite to the valve body cavity in the first direction. The driving section has a first working surface and a second working surface opposite to each other in the first direction. The first working surface is located in the first control cavity, and the second working surface is located in the second control cavity. The driving section has a first inner hole on the side opposite to the sealing section. The first inner hole extends along the first direction and communicates with the first control cavity, the second control cavity, and the return fluid cavity.

[0010] A pilot valve core is slidably disposed in the first inner hole along the first direction so that the pilot valve core has a first position and a second position. In the first position, the first control chamber is connected to the return liquid chamber so that the liquid in the second control chamber pushes the second action surface and causes the main valve core to move toward the closed position. In the second position, the second control chamber is connected to the return liquid chamber so that the liquid in the first control chamber pushes the first action surface and drives the main valve core to move toward the open position.

[0011] A driving device that can drive the pilot valve core to move in the first direction.

[0012] Therefore, the follower-type pilot water-based proportional valve according to the embodiments of the present invention has the advantages of simple structure and easy proportional control.

[0013] In some embodiments, the drive device includes

[0014] A lever is located outside the valve body and can rotate relative to the valve body. The lever is located on the side of the drive section opposite to the blocking section in the first direction. The lever includes a first mating section and a second mating section. When the lever rotates, the first mating section can drive the pilot valve core to move in the first direction.

[0015] The driving unit cooperates with the second mating section and can drive the lever to rotate in a second direction. The distance between the second mating section and the rotation axis of the lever is greater than the distance between the first mating section and the rotation axis of the lever.

[0016] In some embodiments, the drive device includes

[0017] The actuator has a drive unit movably mounted on it in a first direction. The drive unit abuts against the side of the lever facing the valve body. The actuator can drive the drive unit to move in the first direction away from the blocking section. The pilot valve core is provided with a pin hook, which is hooked on the side of the lever facing away from the valve body.

[0018] An elastic element is located within the valve body. The elastic element can undergo elastic deformation in the first direction. Both ends of the elastic element in the first direction are connected to the valve body and the pilot valve core, respectively. The elastic element can drive the pilot valve core to move in the first direction along the direction adjacent to the blocking section.

[0019] In some embodiments, the valve body has a turntable at one end in the first direction, the lever is rotatably mounted on the turntable, and the extension direction of the rotation axis of the lever is the second direction;

[0020] The actuator is located on the side of the valve body away from the turntable in the third direction, and the pilot valve core is located between the actuator and the turntable in the third direction, wherein any two of the first direction, the second direction and the third direction are perpendicular to each other.

[0021] In some embodiments, the pilot valve spool includes

[0022] A pilot valve core body extends along the first direction and is slidably disposed within the first inner hole along the first direction;

[0023] A drive rod extends along the first direction and is slidably disposed on the valve body along the first direction. A first end of the drive rod extends into the first inner hole and is connected to the pilot valve core body. A second end of the drive rod is located outside the valve body. A pin hook is disposed on the second end of the drive rod. An elastic element is disposed around the periphery of the drive rod and abuts against the end face of the pilot valve core body facing the drive rod.

[0024] In some embodiments, the pilot valve core body divides the first inner hole into a first channel and a second channel, the second channel being located on the side of the pilot valve core body adjacent to the blocking section, the pilot valve core having a flow guiding channel, and the second channel, the flow guiding channel, the first channel and the return liquid chamber being connected in sequence;

[0025] The drive section has a first pilot channel and a second pilot channel. In the first position, the first control cavity is connected to the first channel through the first pilot channel, and the pilot valve core body blocks the second pilot channel. In the second position, the second control cavity is connected to the second channel through the second pilot channel, and the pilot valve core body blocks the first pilot channel.

[0026] In some embodiments, the pilot valve core body is provided with a plurality of sealing rings on its periphery, the plurality of sealing rings being spaced apart in the first direction. In the first position, the outlet of the second pilot channel is located between two of the sealing rings, and in the second position, the outlet of the first pilot channel is located between two of the sealing rings.

[0027] In some embodiments, the plurality of sealing rings includes a first sealing ring, a second sealing ring, and a third sealing ring, wherein the first sealing ring, the second sealing ring, and the third sealing ring are arranged sequentially in the first direction away from the blocking section, and the pilot valve core further has a third position in which the outlet of the second pilot channel is located between the first sealing ring and the second sealing ring, and the outlet of the first pilot channel is located between the second sealing ring and the third sealing ring.

[0028] In some embodiments, the area of ​​the second working surface is greater than or equal to the area of ​​the first working surface;

[0029] Both the first liquid inlet channel and the second liquid inlet channel are connected to a liquid inlet pipe with a damper;

[0030] The valve body is provided with a valve seat, which defines the valve body cavity. The valve seat has a first conical surface, and the end of the blocking section facing away from the driving section has a second conical surface. The diameters of the first conical surface and the second conical surface increase in a first direction along the direction adjacent to the driving section. The first conical surface and the second conical surface are adapted to each other. In the closed position, the first conical surface and the second conical surface abut against each other. In the open position, the first conical surface and the second conical surface are spaced apart.

[0031] In some embodiments, the end of the blocking section opposite to the driving section is provided with a balancing shoulder, the balancing shoulder is connected to the blocking section through a valve stem, and the balancing shoulder is slidably disposed in the valve seat. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of a follow-up pilot water-based proportional valve according to an embodiment of the present invention.

[0033] Figure label:

[0034] Valve body 1, valve body cavity 11, valve inlet 12, valve outlet 13, first liquid inlet channel 14, second liquid inlet channel 15, first liquid return channel 16, first control cavity 17, second control cavity 18, liquid return cavity 19.

[0035] Main valve core 2, sealing section 21, second conical surface 211, driving section 22, first inner hole 23, first channel 231, second channel 232, first working surface 24, second working surface 25, first pilot channel 26, second pilot channel 27, balance shoulder 28, valve stem 281.

[0036] Pilot valve core 3, pilot valve core body 31, drive rod 32, flow guide channel 33, pin hook 34;

[0037] Lever 4, first mating section 41, second mating section 42, turntable 43;

[0038] Driver 5, drive unit 51, first sealing ring 52, second sealing ring 53, third sealing ring 54;

[0039] Elastic component 6;

[0040] Valve seat 7, first conical surface 71, first opening 72;

[0041] Inlet pipe 8. Detailed Implementation

[0042] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0043] The following describes an embodiment of the follow-up pilot water-based proportional valve of the present invention with reference to the accompanying drawings. For example... Figure 1 As shown, the follow-up pilot water-based proportional valve according to an embodiment of the present invention includes a valve body 1, a main valve core 2, a pilot valve core 3, and a drive device.

[0044] The valve body 1 has a valve body cavity 11, a valve inlet 12, a valve outlet 13, a first liquid inlet channel 14, a second liquid inlet channel 15, and a first liquid return channel 16. For example, liquid enters the supply pipe from port P and then flows into the valve inlet 12. After the valve body cavity 11 is connected, the liquid in the valve inlet 12 flows from the valve body cavity 11 into the valve outlet 13 and then out of the valve body 1.

[0045] The main valve core 2 is slidably disposed within the valve body 1 along a first direction, so that the main valve core 2 has a closed position and an open position. The main valve core 2 and the valve body 1 define a first control chamber 17, a second control chamber 18, and a return chamber 19. The first inlet channel 14 communicates with the first control chamber 17, and the second inlet channel 15 communicates with the second control chamber 18. Liquid can enter the first control chamber 17 from the first inlet channel 14, liquid can enter the second control chamber 18 from the second inlet channel 15, and liquid in the return chamber 19 can be discharged from the first return channel 16.

[0046] The follow-up pilot water-based proportional valve is a proportional valve with an infinite number of opening positions. The farther the distance between the (multiple) opening positions of the main valve core 2 and the closed position of the main valve core 2 in the first direction, the larger the area of ​​the flow cross section, and the larger the opening and flow rate.

[0047] The main valve core 2 includes a blocking section 21 and a driving section 22. The driving section 22 is located on the side of the blocking section 21 facing away from the valve body cavity 11 in a first direction. The first direction can be a left-right direction, as shown by the arrows in the figure. For example, the driving section 22 is located to the right of the blocking section 21, and the closed position is located to the left of the open position. The blocking section 21 moves to the right to reach (multiple) open positions.

[0048] In the closed position, the blocking section 21 extends into the valve body cavity 11 and isolates the valve inlet 12 and the valve outlet 13, thereby preventing the valve inlet 12 and the valve outlet 13 from communicating. In the open position, the valve inlet 12, the valve body cavity 11, and the valve outlet 13 are connected in sequence, allowing liquid in the valve inlet 12 to flow from the valve body cavity 11 into the valve outlet 13. For example, the main valve core 2 (blocking section 21) can be moved to the left to the closed position, and the main valve core 2 (blocking section 21) can be moved to the right to the open position.

[0049] The drive section 22 has a first working surface 24 and a second working surface 25 facing away from each other in a first direction. The first working surface 24 is located within the first control cavity 17, and the second working surface 25 is located within the second control cavity 18. Specifically, the first working surface 24 faces the blocking section 21 (valve body cavity 11) in the first direction, allowing the liquid in the first control cavity 17 to push the first working surface 24 (drive section 22) away from the blocking section 21 (valve body cavity 11). The second working surface 25 faces away from the blocking section 21 (valve body cavity 11) in the first direction, allowing the liquid in the second control cavity 18 to push the second working surface 25 (drive section 22) towards the adjacent blocking section 21 (valve body cavity 11). For example, if the first working surface 24 faces to the left, the liquid in the first control cavity 17 can push the first working surface 24 (drive section 22) to the right. If the second working surface 25 faces to the right, the liquid in the second control cavity 18 can push the second working surface 25 (drive section 22) to the left.

[0050] The drive section 22 has a first inner hole 23 on the side opposite to the sealing section 21. The first inner hole 23 extends in a first direction and communicates with the first control chamber 17, the second control chamber 18, and the return chamber 19. For example, the first inner hole 23 extends in a left-right direction and the opening of the first inner hole 23 faces to the right.

[0051] The pilot valve core 3 is slidably disposed within the first inner hole 23 along a first direction, so that the pilot valve core 3 has a first position and a second position. In the first position, the first control chamber 17 is connected to the return chamber 19 (the second control chamber 18 is not connected to the return chamber 19), the liquid pressure in the first control chamber 17 decreases, and the liquid pressure in the second control chamber 18 remains unchanged. Under the action of the pressure difference, the liquid in the second control chamber 18 pushes the second action surface 25 and causes the main valve core 2 to move towards the closed position. In the second position, the second control chamber 18 is connected to the return chamber 19 (the first control chamber 17 is not connected to the return chamber 19), the liquid pressure in the second control chamber 18 decreases, and the liquid pressure in the first control chamber 17 remains unchanged. Under the action of the pressure difference, the liquid in the first control chamber 17 pushes the first action surface 24 and drives the main valve core 2 to move towards the open position.

[0052] For example, the pilot valve core 3 is slidably disposed in the first inner hole 23 in the left-right direction. The pilot valve core 3 can reach a first position by moving to the left in the first inner hole 23 (relative to the main valve core 2), and a second position by moving to the right in the first inner hole 23 (relative to the main valve core 2). When the pilot valve core 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 action surface 25 and causes the main valve core 2 to move to the closed position (left side). When the pilot valve core 3 moves to the right to the second position, the second control chamber 18 communicates with the return chamber 19, so that the liquid in the first control chamber 17 pushes the first action surface 24 and drives the main valve core 2 to move to the open position (right side).

[0053] The drive unit can move the pilot valve core 3 in a first direction. For example, the drive unit can move the pilot valve core 3 a preset distance between the first position and the second position (in the left-right direction).

[0054] Therefore, the follower-type pilot water-based proportional valve according to the embodiments of the present invention has the advantages of simple structure and easy proportional control.

[0055] like Figure 1 As shown, in some embodiments, the drive device includes a lever 4 and a drive unit 51.

[0056] Lever 4 is located outside valve body 1 and can rotate relative to valve body 1. Lever 4 is located on the side of drive section 22 opposite to blocking section 21 in the first direction. Lever 4 includes a first mating section 41 and a second mating section 42. When lever 4 rotates, the first mating section 41 can drive the pilot valve core 3 to move in the first direction. For example, when lever 4 rotates, the first mating section 41 can drive the pilot valve core 3 to move between the first position and the second position (in the left-right direction), and lever 4 is located on the right side of valve body 1.

[0057] The drive unit 51 engages with the second mating section 42 and can drive the lever 4 to rotate. The distance between the rotation axis of the second mating section 42 and the lever 4 is greater than the distance between the rotation axis of the first mating section 41 and the lever 4. As a result, the lever arm of the drive unit 51 is greater than the lever arm of the pilot valve core 3, thereby reducing the force required by the drive unit 51 and reducing the energy consumption (drive power) of the drive unit 51.

[0058] like Figure 1 As shown, in some embodiments, the drive device includes a driver 5 and an elastic element 6.

[0059] The drive unit 51 is movably mounted on the actuator 5 in a first direction, and abuts against the side of the lever 4 facing the valve body 1 (the drive unit 51 and the lever 4 are not mechanically connected). The actuator 5 can drive the drive unit 51 to move in the first direction away from the blocking section 21, thereby causing the drive unit 51 to push the lever 4 to rotate in the first direction away from the blocking section 21. Furthermore, the pilot valve core 3 is provided with a pin 34, which is hooked on the side of the lever 4 facing away from the valve body 1, thereby allowing the lever 4 to drive the pin 34 and the pilot valve core 3 to move in the first direction away from the blocking section 21. This allows the pilot valve core 3 to move to a second position, thereby causing the main valve core 2 (blocking section 21) to move to the open position.

[0060] For example, the actuator 5 is a proportional electromagnet, and the drive unit 51 is the iron core of the proportional electromagnet. When the proportional electromagnet is energized, the drive unit 51 moves to the right. The drive unit 51 abuts against the left side of the lever 4. The actuator 5 drives the drive unit 51 to move to the right, thereby causing the drive unit 51 to push the lever 4 to rotate to the right, which in turn causes the lever 4 to drive the pin 34 and the pilot valve core 3 to move to the right. The pilot valve core 3 moves to the second position to the right, and the main valve core 2 (blocking section 21) moves to the open position to the right.

[0061] The elastic element 6 is located inside the valve body 1. The elastic element 6 can elastically deform in the first direction. The two ends of the elastic element 6 in the first direction are connected to the valve body 1 and the pilot valve core 3, respectively. The elastic element 6 can drive the pilot valve core 3 to move in the first direction along the direction adjacent to the blocking section 21. This allows the pilot valve core 3 to move to the first position (while the pin 34 drives the lever 4 to move in the first direction along the direction adjacent to the valve body 1). The elastic element 6 cooperates with the actuator 5. When the actuator 5 (proportional electromagnet) is completely de-energized, the main valve core 2 (blocking section 21) moves to the closed position; when the actuator 5 (proportional electromagnet) is energized, the main valve core 2 (blocking section 21) is in the open position.

[0062] The elastic element 6 enables the pilot valve core 3 to reset in case of failure or power failure, thereby achieving the reset and closure of the main valve core 2, providing a safety self-protection function. Furthermore, the lever 4 and elastic element 6 enable proportional control and low-power drive of the pilot valve core 3. Because both sides of the pilot valve core 3 are low-pressure areas, the lever 4 only needs to overcome the spring force of the elastic element 6 and the frictional force of the pilot valve 3 when driven. The low-power requirement of the proportional electromagnet is easily achieved through the proportional control of the lever 4. For example, the elastic element 6 can move the pilot valve core 3 to the left, thus moving the pilot valve core 3 to the first position (while the pin 34 moves the lever 4 to the left), and the main valve core 2 (blocking section 21) moves to the left to the closed position.

[0063] like Figure 1 As shown, in some embodiments, a turntable 43 is provided at one end of the valve body 1 in a first direction, and a lever 4 is rotatably mounted on the turntable 43. The extension direction of the rotation axis of the lever 4 is a second direction. The actuator 5 is located on the side of the valve body 1 away from the turntable 43 in a third direction, and the pilot valve core 3 is located between the actuator 5 and the turntable 43 in a third direction. Any two of the first, second, and third directions are perpendicular to each other. The second direction can be a front-back direction, and the third direction can be a vertical direction. For example, a turntable 43 is provided at the lower right end of the valve body 1, and the extension direction of the rotation axis of the lever 4 is a front-back direction. The actuator 5 is located on the upper side of the valve body 1, and the pilot valve core 3 is located between the actuator 5 and the turntable 43 in the vertical direction.

[0064] like Figure 1 As shown, in some embodiments, the pilot valve core 3 includes a pilot valve core body 31 and a drive rod 32.

[0065] The pilot valve core body 31 extends along a first direction and is slidably disposed within the first inner hole 23 along the first direction. For example, the pilot valve core body 31 is a column extending along a left-right direction and is slidably disposed within the first inner hole 23 along the left-right direction.

[0066] A drive rod 32 extends along a first direction and is slidably mounted on the valve body 1 along the first direction. The first end of the drive rod 32 extends into the first inner hole 23 and is connected to the pilot valve core body 31. The second end of the drive rod 32 is located outside the valve body 1, and a pin 34 is disposed on the second end of the drive rod 32. An elastic element 6 is arranged around the periphery of the drive rod 32 and abuts against the end face of the pilot valve core 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 valve core body 31. For example, the drive rod 32 extends in a left-right direction and is slidably mounted on the valve body 1 in the left-right direction. The left end of the drive rod 32 extends into the first inner hole 23 and is connected to the right end of the pilot valve core body 31. The right end of the drive rod 32 is located outside the valve body 1, and a pin 34 is disposed on the right end of the drive rod 32. The elastic element 6 (spring) is arranged around the periphery of the drive rod 32, and the left end of the elastic element 6 abuts against the right end face of the pilot valve core body 31.

[0067] like Figure 1 As shown, in some embodiments, the pilot valve core body 31 divides the first inner hole 23 into a first channel 231 and a second channel 232. The second channel 232 is located on the side of the pilot valve core body 31 adjacent to the blocking section 21. The pilot valve core 3 has a flow guiding channel 33, and the second channel 232, the flow guiding channel 33, the first channel 231, and the return chamber 19 are sequentially connected. For example, the second channel 232, the flow guiding channel 33, the first channel 231, and the return chamber 19 are sequentially connected from left to right.

[0068] The drive section 22 has a first pilot channel 26 and a second pilot channel 27. In the first position, the first control chamber 17 is connected to the first channel 231 through the first pilot channel 26, and the pilot valve core body 31 blocks the second pilot channel 27. In the second position, the second control chamber 18 is connected to the second channel 232 through the second pilot channel 27, and the pilot valve core body 31 blocks the first pilot channel 26.

[0069] For example, when the pilot valve core 3 moves to the left to the first position, the first control chamber 17, the first pilot channel 26, the first channel 231, the return chamber 19, and the first return channel 16 are connected in sequence. The liquid in the first control chamber 17 can be discharged (the pressure decreases), and the pilot valve core body 31 blocks the second pilot channel 27. The liquid in the second control chamber 18 cannot be discharged (the pressure remains unchanged). The liquid pressure in the second control chamber 18 is greater than the liquid pressure in the first control chamber 17, which allows the liquid in the second control chamber 18 to push the second action surface 25 (drive section 22) to move to the left, and causes the main valve core 2 to move to the closed position (left side).

[0070] The pilot valve core 3 moves to the right to the second position, and the second control chamber 18, the second pilot channel 27, the second channel 232, the guide channel 33, the first channel 231, the return chamber 19, and the first return channel 16 are connected in sequence. At this moment, the pilot valve core body 31 blocks the first pilot channel 26. The liquid in the first control chamber 17 cannot be discharged, and the liquid pressure in the first control chamber 17 is greater than the liquid pressure in the second control chamber 18. This allows the liquid in the first control chamber 17 to push the first working surface 24 (drive section 22) to move to the right, and causes the main valve core 2 to move to the open position (right side).

[0071] like Figure 1 As shown, in some embodiments, the pilot valve core body 31 has multiple sealing rings on its periphery, and the multiple sealing rings are spaced apart in a first direction. In a first position, the outlet of the second pilot channel 27 is located between two sealing rings. In a second position, the outlet of the first pilot channel 26 is located between two sealing rings. This allows the pilot valve core body 31 to have good sealing performance, so that water-based media can be used to enter the first control chamber 17 and the second control chamber 18.

[0072] like Figure 1 As shown, in some embodiments, the multiple sealing rings include a first sealing ring 52, a second sealing ring 53, and a third sealing ring 54, which are arranged sequentially in a first direction away from the sealing section 21. The pilot valve core 3 also has a third position, in which the outlet of the second pilot channel 27 is located between the first sealing ring 52 and the second sealing ring 53, and the outlet of the first pilot channel 26 is located between the second sealing ring 53 and the third sealing ring 54. Specifically, the third position is located between the first and second positions. In the third position of the pilot valve core 3, both the first pilot channel 26 and the second pilot channel 27 are closed, that is, at this moment, the liquid in the first control chamber 17 and the second control chamber 18 is not discharged (the pressure in the first control chamber 17 and the second control chamber 18 is the pressure of the system port P). For example, the third position can be the initial position, with the pilot valve core 3 in the third position and the main valve core 2 in the closed position. The first sealing ring 52, the second sealing ring 53, and the third sealing ring 54 are arranged sequentially from left to right. Alternatively, the initial position can be the second position, with the pilot valve core 3 in the second position and the main valve core 2 in the closed position. This makes the hydraulic pressure in the second control chamber 18 greater than that in the first control chamber 17, so that the main valve core 2 has a larger sealing contact force under the action of the second control chamber 18, thus achieving a reliable seal.

[0073] like Figure 1As shown, in some embodiments, the area of ​​the second acting surface 25 is greater than or equal to the area of ​​the first acting surface 24. For example, the area of ​​the second acting surface 25 is greater than the area of ​​the first acting surface 24, so that when the pilot valve core 3 is in the third position, the main valve core 2 is in the closed position. That is, the effective acting area of ​​the second acting surface 25 on the right is greater than the effective acting area of ​​the first acting surface 24 on the left. Thus, under the same pressure, the closing force of the main valve core 2 is to the left, achieving a reliable seal.

[0074] In some embodiments, both the first inlet channel 14 and the second inlet channel 15 are connected to the inlet pipe 8 with a damper. Specifically, the damper has a throttling orifice, which has the function of limiting flow and reducing pressure. After entering the inlet pipe 8 with the damper from port K1, the liquid flows into the first inlet channel 14 (first control chamber 17), and after entering the inlet pipe 8 with the damper from port K2, the liquid flows into the second inlet channel 15 (second control chamber 18). The structure of the pilot valve core 3 with three seals (first sealing ring 52, second sealing ring 53, and third sealing ring 54) can realize the communication between the first control chamber 17, the second control chamber 18, and the guide channel 33, and thus, combined with the damper, realize the control of the pressure of the first control chamber 17 and the second control chamber 18. In the third position and the second position, it has a good sealing effect and is suitable for water-based media.

[0075] like Figure 1 As shown, in some embodiments, a valve seat 7 is provided inside the valve body 1, defining a valve body cavity 11. The valve seat 7 has a first conical surface 71, and the end of the blocking 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 increase in a first direction along the direction adjacent to the driving section 22. The first conical surface 71 and the second conical surface 211 are adapted to each other (arranged opposite each other). In the closed position, the first conical surface 71 and the second conical surface 211 abut against each other, and in the open position, the first conical surface 71 and the second conical surface 211 are spaced apart.

[0076] Specifically, the first conical surface 71 faces the drive section 22, and the first conical surface 71 is adapted to the second conical surface 211 so that in the closed position, the sealing section 21 can easily isolate the valve inlet 12 and the valve outlet 13. For example, the first conical surface 71 faces to the right, and the left end of the sealing section 21 has a second conical surface 211 facing to the left, with the diameter of the first conical surface 71 and the diameter of the second conical surface 211 increasing to the right.

[0077] like Figure 1As shown, in some embodiments, the valve seat 7 is open on the side facing away from the lever 4 in a first direction to form a first opening 72. A balancing shoulder 28 is provided at the end of the blocking section 21 facing away from the drive section 22, and the balancing shoulder 28 is connected to the blocking section 21 via the valve stem 281. The balancing shoulder 28 is slidably disposed within the valve seat 7, and the balancing shoulder 28 blocks the first opening 72. Specifically, the balancing shoulder 28 and the blocking 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 balancing shoulder 28 and the blocking section 21 respectively, thereby reducing the impact of the hydraulic pressure at the valve outlet 13 on the main valve core 2. For example, the left side of the valve seat 7 is open to form the first opening 72. The right end of the blocking section 21 is provided with a balancing shoulder 28.

[0078] In some embodiments, the first opening 72 is connected to the first return channel 16.

[0079] In the description of this 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," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0080] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0081] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0082] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0083] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0084] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A follow-up pilot water-based proportional valve, characterized in that, include: The valve body has a valve body 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 is slidably disposed within the valve body along a first direction, such 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 return chamber. A first inlet channel communicates with the first control chamber, and a second inlet channel communicates with the second control chamber. Liquid can flow into the first control chamber from the first inlet channel, and liquid can flow into the second control chamber from the second inlet channel. Liquid in the return chamber can be discharged from the first return channel. The main valve core includes... In the closed position, the sealing section extends into the valve body cavity and isolates the valve inlet and the valve outlet; in the open position, the valve inlet, the valve body cavity, and the valve outlet are connected in sequence. The driving section is located on the side of the sealing section opposite to the valve body cavity in the first direction. The driving section has a first working surface and a second working surface opposite to each other in the first direction. The first working surface is located in the first control cavity, and the second working surface is located in the second control cavity. The driving section has a first inner hole on the side opposite to the sealing section. The first inner hole extends along the first direction and communicates with the first control cavity, the second control cavity, and the return fluid cavity. A pilot valve core is slidably disposed in the first inner hole along the first direction so that the pilot valve core has a first position and a second position. In the first position, the first control chamber is connected to the return liquid chamber so that the liquid in the second control chamber pushes the second action surface and causes the main valve core to move toward the closed position. In the second position, the second control chamber is connected to the return liquid chamber so that the liquid in the first control chamber pushes the first action surface and drives the main valve core to move toward the open position. A driving device that can drive the pilot valve core to move in the first direction.

2. The follow-up pilot water-based proportional valve according to claim 1, characterized in that, The driving device includes A lever is located outside the valve body and can rotate relative to the valve body. The lever is located on the side of the drive section opposite to the blocking section in the first direction. The lever includes a first mating section and a second mating section. When the lever rotates, the first mating section can drive the pilot valve core to move in the first direction. The driving unit cooperates with the second mating section and can drive the lever to rotate in a second direction. The distance between the second mating section and the rotation axis of the lever is greater than the distance between the first mating section and the rotation axis of the lever.

3. The follow-up pilot water-based proportional valve according to claim 2, characterized in that, The driving device includes The actuator has a drive unit movably mounted on it in a first direction. The drive unit abuts against the side of the lever facing the valve body. The actuator can drive the drive unit to move in the first direction away from the blocking section. The pilot valve core is provided with a pin hook, which is hooked on the side of the lever facing away from the valve body. An elastic element is located within the valve body. The elastic element can undergo elastic deformation in the first direction. Both ends of the elastic element in the first direction are connected to the valve body and the pilot valve core, respectively. The elastic element can drive the pilot valve core to move in the first direction along the direction adjacent to the blocking section.

4. The follow-up pilot water-based proportional valve according to claim 3, characterized in that, The valve body has a turntable at one end in the first direction, the lever is rotatably mounted on the turntable, and the extension direction of the rotation axis of the lever is the second direction; The actuator is located on the side of the valve body away from the turntable in the third direction, and the pilot valve core is located between the actuator and the turntable in the third direction, wherein any two of the first direction, the second direction and the third direction are perpendicular to each other.

5. The follow-up pilot water-based proportional valve according to claim 3, characterized in that, The pilot valve core includes A pilot valve core body extends along the first direction and is slidably disposed within the first inner hole along the first direction; A drive rod extends along the first direction and is slidably disposed on the valve body along the first direction. A first end of the drive rod extends into the first inner hole and is connected to the pilot valve core body. A second end of the drive rod is located outside the valve body. A pin hook is disposed on the second end of the drive rod. An elastic element is disposed around the periphery of the drive rod and abuts against the end face of the pilot valve core body facing the drive rod.

6. The follow-up pilot water-based proportional valve according to claim 5, characterized in that, The pilot valve core body divides the first inner hole into a first channel and a second channel. The second channel is located on the side of the pilot valve core body adjacent to the blocking section. The pilot valve core has a flow guiding channel. The second channel, the flow guiding channel, the first channel and the return liquid chamber are connected in sequence. The drive section has a first pilot channel and a second pilot channel. In the first position, the first control cavity is connected to the first channel through the first pilot channel, and the pilot valve core body blocks the second pilot channel. In the second position, the second control cavity is connected to the second channel through the second pilot channel, and the pilot valve core body blocks the first pilot channel.

7. The follow-up pilot water-based proportional valve according to claim 6, characterized in that, The pilot valve core body is provided with a plurality of sealing rings on its periphery, and the plurality of sealing rings are spaced apart in the first direction. In the first position, the outlet of the second pilot channel is located between two of the sealing rings, and in the second position, the outlet of the first pilot channel is located between two of the sealing rings.

8. The follow-up pilot water-based proportional valve according to claim 7, characterized in that, The plurality of sealing rings includes a first sealing ring, a second sealing ring, and a third sealing ring, wherein the first sealing ring, the second sealing ring, and the third sealing ring are arranged sequentially in the first direction away from the blocking section. The pilot valve core also has a third position in which the outlet of the second pilot channel is located between the first sealing ring and the second sealing ring, and the outlet of the first pilot channel is located between the second sealing ring and the third sealing ring.

9. The follow-up pilot water-based proportional valve according to any one of claims 1-8, characterized in that, The area of ​​the second working surface is greater than or equal to the area of ​​the first working surface; Both the first liquid inlet channel and the second liquid inlet channel are connected to a liquid inlet pipe with a damper; The valve body is provided with a valve seat, which defines the valve body cavity. The valve seat has a first conical surface, and the end of the blocking section facing away from the driving section has a second conical surface. The diameters of the first conical surface and the second conical surface increase in a first direction along the direction adjacent to the driving section. The first conical surface and the second conical surface are adapted to each other. In the closed position, the first conical surface and the second conical surface abut against each other. In the open position, the first conical surface and the second conical surface are spaced apart.

10. The follow-up pilot water-based proportional valve according to claim 9, characterized in that, The blocking section has a balancing shoulder at one end opposite to the driving section. The balancing shoulder is connected to the blocking section through a valve stem and is slidably disposed within the valve seat.

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