A two-stage large-diameter plug-in throttle valve driven by a voice coil motor

Abstract

The present invention discloses a two-stage large-diameter plug-in throttle valve driven by a voice coil motor, wherein one end of the valve sleeve is connected to the valve cover and a working port is provided on the outer circumferential surface and the other end respectively, a control port, a return port and two annular grooves are provided on the valve cover, a main valve core is located in the valve sleeve and is provided with a valve flap and a swing plate, the valve flap can rotate with the main valve core to control the opening and closing of the two working ports, a torsion spring can drive the main valve core to drive the valve flap to rotate to cut off the connection of the two working ports, a control chamber and a return chamber are formed on both sides of the swing plate, the control chamber is connected to the control port, the return chamber is connected to the return port, the control valve core is connected to the voice coil motor and is provided with a damping groove to change the flow area between the two annular grooves, the two annular grooves are respectively connected to the control port and the return port; a second damping is provided at the control port. The throttle valve adopts a plug-in valve form, has a stronger anti-fouling ability and a larger diameter, can make the overall volume smaller, and can be applied to a wider range of applications.

Description

Technical Field

[0001] The invention relates to the technical field of hydraulic components, and in particular to a two-stage large-diameter plug-in throttle valve driven by a voice coil motor. Background Art

[0002] The throttle valve is a control device used to adjust the flow of fluids and is widely used in various industrial pipeline systems. The throttle valve controls the flow of fluids by changing the opening of the valve port, thereby achieving precise control of the fluid system. It is a commonly used flow control element in hydraulic systems.

[0003] At present, in large flow hydraulic systems, in order to meet the control requirements of large flow and high frequency response in the hydraulic system, a large-diameter servo throttle valve is generally used to control the oil. However, the existing large-diameter servo throttle valve has the following problems:

[0004] 1. The current large-diameter servo throttle valve generally adopts the form of a plate valve, which makes the servo throttle valve have poor anti-fouling ability, weak flow capacity, and large overall volume, which affects the widespread use of large-diameter servo throttle valves;

[0005] 2. The current large-diameter servo throttle valve is generally controlled by a proportional solenoid, which makes the existing servo throttle valve have a slow response frequency and limited control accuracy, and cannot guarantee accurate control of larger flows in the system;

[0006] 3. The current large-diameter servo throttle valve generally controls the opening of the main valve core by changing the pressure of the control oil during control. However, when the pressure fluctuation of the hydraulic system is large, the pressure fluctuation of the hydraulic system is transmitted to the control oil circuit, which will cause the opening of the main valve core to change, thereby causing a large change in the flow in the main valve control oil circuit. In order to control the opening of the main valve core to remain unchanged, it is necessary to frequently control the movement of the proportional solenoid to adjust the displacement of the main valve core. This not only reduces the response speed and control accuracy, but also affects the service life of the large-diameter servo throttle valve due to the frequent movement of the proportional solenoid. Summary of the invention

[0007] In view of the above problems, the present invention proposes a two-stage large-diameter plug-in throttle valve driven by a voice coil motor to overcome the above problems or at least partially solve the above problems.

[0008] A two-stage large-diameter plug-in throttle valve driven by a voice coil motor comprises a valve sleeve, a valve cover, a main valve core, a control valve core and a voice coil motor, wherein one end of the valve sleeve is connected to the valve cover, a first working port is arranged on the outer circumferential surface of the valve sleeve, a second working port is arranged on the other end of the valve sleeve, a control port, a reflux port, a first annular groove and a second annular groove are arranged on the valve cover, the main valve core is arranged in the valve sleeve by rotation of a torsion spring, a valve flap and a swing plate are arranged on the main valve core, the valve flap and the swing plate can rotate synchronously with the main valve core, the valve flap can control the on-off between the first working port and the second working port with the rotation of the main valve core, the torsion spring can drive the main valve core to drive the The valve disc rotates to cut off the connection between the first working port and the second working port, and a control chamber and a reflux chamber are respectively formed on both sides of the swing plate. The control chamber is connected to the control port, and the reflux chamber is connected to the reflux port. The voice coil motor is arranged on the valve cover, and the protruding end of the voice coil motor is connected to the control valve core to drive the control valve core to reciprocate in the valve cover. A damping groove is provided on the control valve core, and the damping groove can change the flow area between the first annular groove and the second annular groove with the reciprocating movement of the control valve core. The first annular groove is connected to the control port, and the second annular groove is connected to the reflux port; a second damper is provided at the inlet position of the control port.

[0009] Preferably, the throttle valve also includes a one-way flow block; the one-way flow block is located in the control chamber, dividing the control chamber into a front chamber and a rear chamber, the swing plate simultaneously forms a part of the front chamber and a part of the rear chamber, the front chamber and the rear chamber are connected through a first damping, and the control port is connected to the front chamber.

[0010] Preferably, the one-way flow block adopts a fan-shaped shell structure and is coaxially rotatable with the main valve core, and one end along the circumferential direction toward the swing plate is open, and a fan-shaped plate coaxial with the main valve core and extending toward the front cavity is provided in the swing plate near the main valve core, and the one-way flow block is arranged on the outside of the fan-shaped plate; the part of the swing plate aligned with the open end of the one-way flow block forms the rear cavity, and the fan-shaped plate on the swing plate and the other end of the one-way flow block along the circumferential direction form the front cavity.

[0011] Preferably, the area of ​​the portion of the swing plate that forms the rear cavity is larger than the area of ​​the portion of the swing plate that forms the front cavity.

[0012] Preferably, a flow channel is provided on the outer circumferential surface of the one-way flow block; the one-way flow block can rotate in the direction close to the front cavity to connect the two ends of the flow channel with the front cavity and the rear cavity respectively; the one-way flow block can rotate in the direction away from the front cavity and abut against the valve sleeve to block the flow channel.

[0013] Preferably, the throttle valve also includes a reed; the reed is located in the front chamber, the reed is connected to the one-way flow block, the reed can drive the one-way flow block to rotate in a direction away from the front chamber until the flow channel is blocked, and the oil in the rear chamber can push the one-way flow block to move in a direction close to the front chamber until the flow channel connects the front chamber and the rear chamber.

[0014] Preferably, the throttle valve further comprises a sensor; the sensor is connected to the main valve core to detect the rotation angle of the main valve core.

[0015] Preferably, the throttle valve also includes a transmission plate, one end of which is sleeved and fixed on the protruding end of the main valve core, and the other end of the transmission plate is provided with a transmission groove along the radial direction of the main valve core. The sensor adopts a displacement sensor and the telescopic end of the sensor is provided with a connecting pin extending into the transmission groove.

[0016] Preferably, the extended end of the voice coil motor is rotatably connected to the control valve core, so that the control valve core can rotate around its own axis.

[0017] Preferably, the second damping adopts fixed damping.

[0018] The two-stage large-diameter plug-in throttle valve driven by a voice coil motor of the present invention has the following beneficial technical effects:

[0019] 1. In the present invention, by designing the valve sleeve and valve cover structure as a cartridge valve, the throttle valve of the present invention can have strong anti-fouling ability and a large diameter, and at the same time, can have a small overall volume, so that it can be suitable for a wider range of applications.

[0020] 2. In the present invention, the main valve core is feedback-controlled by using a voice coil motor and a sensor, which has fast response and high precision, and can meet the requirements of high-speed and precise control of large-flow systems.

[0021] 3. In the present invention, a front chamber and a rear chamber connected by a first damper are formed by a one-way flow block, and the swing plate serves as a forming part of the front chamber and the rear chamber respectively. When the pressure fluctuation in the control oil circuit rises suddenly, the oil enters the front chamber, thereby pushing the swing plate to swing. However, due to the action of the first damper, the movement of the swing plate will cause the pressure in the rear chamber to drop immediately, thereby preventing the swing plate from rotating. Only when the pressure at the control port continues to rise will the swing plate be pushed to rotate continuously, thereby reducing the influence of pressure fluctuations on the opening of the main valve core.

[0022] 4. In the present invention, a front cavity and a rear cavity connected by a first damper are formed by a one-way flow block, and the swing plates serve as forming parts of the front cavity and the rear cavity respectively, so that when the pressure fluctuation at the control port suddenly drops, the pressure in the front cavity is reduced first, and the swing plate is pushed to rotate under the action of the torsion spring. Under the action of the first damper, the rotation of the swing plate will increase the pressure in the rear cavity, thereby preventing the swing plate from rotating quickly, reducing the influence of pressure fluctuations on the opening of the main valve core, and when pressure fluctuations occur, there is no need for a voice coil motor to control, which can extend the service life of the voice coil motor.

[0023] 5. In the present invention, a one-way flow block in the form of a fan-shaped shell structure is used to form a front cavity and a rear cavity, and the rear cavity is arranged on the periphery of the front cavity. The characteristics of the fan-shaped structure can be utilized so that when the swing plate rotates, the front cavity and the rear cavity are connected only through the first damping, thereby achieving accurate control.

[0024] 6. In the present invention, the area of ​​the rear cavity formed by the swing plate is designed to be larger than the area of ​​the front cavity formed by the swing plate, so that during the rotation of the swing plate, the volume change of the rear cavity is much larger than the volume change of the front cavity, so that the rear cavity can achieve better resistance to pressure fluctuations, thereby improving the main valve core opening's resistance to pressure fluctuation interference. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the cross-sectional structure of a two-stage large-diameter plug-in throttle valve driven by a voice coil motor according to the present embodiment;

[0026] Figure 2 for Figure 1 Schematic diagram of the cross-sectional structure along the AA direction;

[0027] Figure 3 for Figure 1 Schematic diagram of the cross-sectional structure along the BB direction;

[0028] Figure 4 for Figure 1 Schematic diagram of the cross-sectional structure along the CC direction;

[0029] Figure 5 for Figure 1Schematic diagram of the cross-sectional structure along the DD direction;

[0030] Figure 6 for Figure 3 The schematic diagram of the local enlarged structure at position I in the middle;

[0031] Figure 7 Schematic diagram of the appearance structure of the unidirectional current block in this embodiment. DETAILED DESCRIPTION

[0032] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0033] Combination Figures 1 to 7 As shown, the present embodiment is a two-stage large-diameter plug-in throttle valve driven by a voice coil motor, comprising a valve sleeve 1, a valve cover 2, a main valve core 3, a control valve core 4 and a voice coil motor 5. One end of the valve sleeve 1 is connected to the valve cover 2. A first working port 6 is arranged on the outer circumferential surface of the valve sleeve 1. A second working port 7 is arranged on the other end of the valve sleeve 1. A control port 8, a reflux port 9, a first annular groove 10 and a second annular groove 11 are arranged on the valve cover 2. The main valve core 3 is rotatably arranged in the valve sleeve 1 by a torsion spring 12. A valve flap 13 and a swing plate 14 are arranged on the main valve core 3. The valve flap 13 and the swing plate 14 can rotate synchronously with the main valve core 3, wherein the valve flap 13 can rotate with the main valve core 3 to control the connection and disconnection between the first working port 6 and the second working port 7. The torsion spring 12 can drive the main valve core 3 to drive the valve flap 13 to rotate until the first working port 6 is blocked and the connection between the first working port 6 and the second working port 7 is cut off. A control chamber 15 and a reflux chamber 16 are formed on both sides of the swing plate 14, respectively. The control chamber 15 is connected to the control port 8, and the reflux chamber 16 is connected to the reflux port 9. The voice coil motor 5 is arranged on the valve cover 2, and the extended end of the voice coil motor 5 is connected to the control valve core 4 to drive the control valve core 4 to reciprocate in the valve cover 2. The control valve core 4 is provided with a damping groove 17, and the damping groove 17 can change the flow area between the first annular groove 10 and the second annular groove 11 with the reciprocating movement of the control valve core 4. The first annular groove 10 is connected to the control port 8, and the second annular groove 11 is connected to the reflux port 9. A second damper 28 is also provided at the control port 8.

[0034] In this embodiment, by adopting the cartridge valve structure composed of the valve sleeve and the valve cover, the throttle valve can not only have a stronger anti-fouling ability, but also be designed as a larger diameter structure, and the overall volume can be smaller, so as to achieve a wider range of application effects. At the same time, the throttle valve of this embodiment uses a voice coil motor to drive the control valve core to move, and the damping groove can quickly change the flow area between the first annular groove and the second annular groove, thereby cooperating with the second damping to change the pressure of the control oil flowing from the control port to the control chamber, changing the oil force formed on the swing plate, and then cooperating with the torsion spring to control the rotation of the main valve core, thereby driving the valve disc to rotate and changing the valve port opening between the first working port and the second working port, so as to achieve fast and accurate control of the large flow system.

[0035] Combination Figure 1 and Figure 2 As shown, in the throttle valve of this embodiment, a one-way flow block 18 is further included. The one-way flow block 18 is located in the control chamber 15, and divides the control chamber 15 into a front chamber 19 and a rear chamber 20. The swing plate 14 simultaneously serves as a part of the rear chamber 20 and a part of the front chamber 19, and the front chamber 19 and the rear chamber 20 are connected through the first damper 21, and the control port 8 is connected to the front chamber 19.

[0036] In this embodiment, the control chamber is divided into a front chamber and a rear chamber connected by a damper, and the swing plate is used as a part of the front chamber and a part of the rear chamber respectively. In this way, when the oil pressure fluctuation at the control port suddenly rises, the oil pressure is transmitted to the front chamber, and the oil pressure in the front chamber directly acts on the swing plate to drive the main valve core to overcome the torsion spring and rotate. Due to the action of the first damper, the pressure rise of the oil in the rear chamber is slower than that of the front chamber. The movement of the swing plate will cause the pressure in the rear chamber to drop immediately and stop rotating under the action of the torsion spring, which plays a role in preventing the swing plate from continuing to rotate. Only when the oil pressure at the control port continues to rise can the oil push the swing plate to rotate continuously, thereby reducing the influence of the sudden increase in the pressure fluctuation at the control port on the opening of the main valve core. When the first working port is in an open state and the oil pressure fluctuation at the control port suddenly drops, the oil pressure in the front chamber is reduced first, and the swing plate rotates in the direction close to the front chamber under the action of the torsion spring, that is, Figure 2 The valve body rotates counterclockwise as shown, and the oil pressure in the rear chamber increases under the action of the first damping, thereby preventing the swing plate from rotating quickly, reducing the impact of the sudden drop in pressure fluctuation at the control port on the opening of the main valve core, and when pressure fluctuations occur, there is no need for a voice coil motor to control, which can extend the service life of the voice coil motor.

[0037] Combination Figure 2 and Figure 7As shown, in the throttle valve of this embodiment, the one-way flow block 18 adopts a sector-shaped housing structure and is coaxially rotatably arranged with the main valve core 3, and one end facing the swing plate 14 along the circumferential direction is in an open form, and a sector plate 14a coaxial with the main valve core 3 and extending toward the front cavity 19 is provided in the swing plate 14 near the main valve core 3, and the one-way flow block 18 is arranged on the outside of the sector plate of the swing plate 14. The part of the swing plate 14 aligned with the open end of the one-way flow block 18 forms a rear cavity 20, and the sector plate 14a on the swing plate 14 and the other end of the one-way flow block 18 along the circumferential direction form a front cavity 19.

[0038] In this embodiment, by adopting a one-way flow block with a fan-shaped housing structure and arranging a fan-shaped plate at a position close to the main valve core on the swing plate, the one-way flow block is arranged on the outer side of the fan-shaped plate in the swing plate, so that when the one-way flow block and the swing plate rotate relative to each other, the fan-shaped plate can be used to maintain the front chamber and the rear chamber connected only through the first damping, thereby ensuring that the influence of the pressure fluctuation of the control port on the opening of the main valve core is reduced. The outer arc size of the fan-shaped plate can be designed according to the arc size of the relative rotation formed by the swing plate and the one-way flow block during the operation of the throttle valve, so as to ensure that the fan-shaped plate always overlaps with the one-way flow block during the whole process of relative rotation of the swing plate and the one-way flow block, thereby ensuring that the front chamber and the rear chamber are connected only through the first damping at this stage.

[0039] Combination Figure 2 As shown, in this embodiment, the area of ​​the portion of the rear cavity 20 formed in the swing plate 14 is designed to be larger than the area of ​​the portion of the front cavity 19 formed by the fan-shaped plate 14a in the swing plate 14. In this way, the volume change of the rear cavity can be greater than the volume change of the front cavity during the rotation of the swing plate, so that the rear cavity has a better anti-pressure fluctuation effect, and the anti-pressure fluctuation interference effect of the main valve core opening is further improved.

[0040] Combination Figure 2 and Figure 7 As shown, in the throttle valve of this embodiment, a flow passage 23 is provided on the outer circumferential surface of the one-way flow block 18. The one-way flow block 18 can rotate toward the direction close to the front chamber 19, that is, Figure 2 The one-way flow block 18 can rotate in a direction away from the front cavity 19 and abut against the positioning step on the valve sleeve 1 to block the flow passage 23. Figure 2 Position status shown.

[0041] In this embodiment, by providing a flow channel on the rotatable one-way flow block, when the main valve core is controlled to perform a closing operation, especially when rapid closing is required, the one-way flow block can be controlled to rotate to the flow channel to connect the front chamber and the rear chamber, so that the oil in the rear chamber can quickly enter the front chamber and flow to the reflux port, completing the rapid rotation of the swing plate toward the front chamber under the action of the torsion spring, and causing the valve disc to quickly rotate to the first working port to complete the closing operation.

[0042] Combination Figure 2 As shown, in the throttle valve of this embodiment, a reed 22 is further provided. The reed 22 is located in the front cavity 19 and is connected to the one-way flow block 18. The reed 22 can drive the one-way flow block 18 to rotate in a direction away from the front cavity 19 until the flow passage 23 is blocked, that is, the reed 22 can be as Figure 2 The oil in the rear chamber 20 can push the one-way flow block 18 to overcome the force of the reed 22 and the force of the oil in the front chamber 19 on the one-way flow block 18 and move toward the front chamber 19, that is, toward the Figure 2 As shown, the one-way flow block 18 is pushed counterclockwise to rotate.

[0043] In this embodiment, by designing the one-way flow block to be rotatable and arranging a reed in the front chamber, when the main valve core is controlled to perform a closing operation, when the oil pressure in the front chamber drops rapidly and a sufficiently large pressure difference is formed between the front chamber and the rear chamber, the oil in the rear chamber can push the one-way flow block to overcome the reed and automatically move toward the front chamber, so that the flow channel connects the front chamber and the rear chamber, and then the oil in the rear chamber quickly enters the front chamber and flows to the reflux port, completing the rapid rotation of the swing plate toward the front chamber under the action of the torsion spring, so that the valve disc quickly rotates to the first working port to complete the closing operation.

[0044] Among them, in this embodiment, if Figure 2 As shown, by providing a positioning step inside the valve sleeve 1, the reed 22 pushes the one-way flow block 18 to rotate until it abuts against the positioning step, so that the one-way flow block 18 can be positioned to the maximum position of the rotation away from the front chamber 19 and the flow passage 23 is just blocked, that is, Figure 2 At the same time, when the valve flap 13 is in the blocking state for the first working port 6 under the action of the torsion spring 12, the swing plate 14 also rotates to Figure 2 The position shown in the figure cannot be rotated further toward the front cavity 19.

[0045] Combination Figure 4As shown, in the throttle valve of this embodiment, a sensor 24 is also provided. The sensor 24 is connected to the main valve core 3 to detect the rotation angle of the main valve core 3, that is, to detect the opening of the main valve core. In this way, after the voice coil motor drives the control valve core to change the opening of the main valve core, the sensor detects the change in the opening of the main valve core, and then feeds back the detection result, so that the feedback control composed of the voice coil motor and the sensor can be realized, and the effect of fast response and high precision can be achieved, which meets the high-speed and precise control of the large flow system.

[0046] Combination Figure 1 and Figure 4 As shown, in the throttle valve of this embodiment, a transmission plate 25 is further provided. One end of the transmission plate 25 is sleeved and fixed on the extended end of the main valve core 3, and the other end of the transmission plate 25 is provided with a transmission groove 26 along the radial direction of the main valve core 3. The sensor 24 adopts a displacement sensor and the telescopic end of the sensor 24 is provided with a connecting pin 27 extending into the transmission groove.

[0047] At this time, during the rotation of the main valve core, the transmission groove on the transmission plate can drive the connecting pin to move back and forth in a straight line, so that the corresponding movement data is collected by the sensor using the displacement sensor, and then the corresponding rotation data of the main valve core is obtained and fed back to realize feedback control.

[0048] Combination Figure 3 As shown, in the throttle valve of this embodiment, the extended end of the voice coil motor 5 is connected to the control valve core 4 by rotation, for example, by a hook connection, so that the control valve core 4 can rotate around its own axis. In this way, it can be ensured that the voice coil motor drives the control valve core to move back and forth flexibly in the valve cover, avoiding the control valve core from getting stuck in the circumferential direction, and improving the control stability and control accuracy of the throttle valve.

[0049] Combination Figure 5 As shown, in the throttle valve of this embodiment, the second damping 28 adopts a fixed damping in the form of a damping screw, and is threadedly connected to the inlet position of the control port 8, thereby forming a B-type hydraulic half-bridge. Of course, in other embodiments, different forms of second damping, such as variable damping, can be replaced according to different use requirements, so as to form other forms of hydraulic half-bridges for controlling the oil pressure in the front chamber with the damping groove, thereby obtaining different control effects.

[0050] In addition, combined Figures 1 to 7 As shown, in this embodiment, a plurality of flow channels are provided on the valve sleeve 1 and the valve cover 2 for guiding the flow of oil, specifically including a first flow channel 29 between the control port 8 and the first annular groove 10, a second flow channel 30 between the first annular groove 10 and the front cavity 19, a third flow channel 31 between the reflux cavity 16 and the second annular groove 11, and a fourth flow channel 32 between the second annular groove 11 and the reflux port 9.

[0051] Combination Figures 1 to 7 As shown, the specific working process of the two-stage large-diameter plug-in throttle valve driven by the voice coil motor in this embodiment is as follows:

[0052] When the throttle valve of this embodiment is used for control, the first working port 6 is connected to the system main oil circuit, the control port 8 is connected to the system control oil circuit, and the return port 9 is connected to the system return oil circuit.

[0053] When the flow of the second working port 7 needs to be adjusted, the voice coil motor 5 is controlled to work to drive the control valve core 4 to move, change the flow area between the damping groove 17 and the first annular groove 10 and the second annular groove 11, and the control oil at the control port 8 flows to the first annular groove 10 through the first flow channel 29 after passing through the second damping 28. A part of the control oil flows to the front cavity 19 through the second flow channel 30 and enters the rear cavity 20. The other part of the control oil flows to the second annular groove 11 through the damping groove 17 and then flows to the reflux port 9 through the fourth flow channel 32. The change in the flow area of ​​the damping groove 17 can change the oil pressure at the first annular groove 10, thereby controlling the oil pressure in the front cavity 19 and the rear cavity 20. The oil pressure changes, and the force exerted on the swing plate 14 by the oil pressure is compared with the force exerted on the swing plate 14 by the torsion spring 12 through the main valve core 3 to control the rotation angle of the main valve core 3. The one-way flow block 18 maintains contact with the valve sleeve 1 under the action of the reed 22 to keep the flow passage 23 closed, and the reflux chamber 16 maintains communication with the reflux port 9 through the third flow passage 31, the second annular groove 11 and the fourth flow passage 32. Therefore, the main valve core 3 rotates with the valve disc 13 to change the blocking condition of the valve disc 13 on the first working port 6, change the valve port opening, and change the flow of oil in the main oil circuit of the system between the first working port 6 and the second working port 7.

[0054] At the same time, as the main valve core 3 rotates, the main valve core 3 drives the transmission plate 25 to rotate, and the transmission groove 26 on the transmission plate 25 drives the sensor 24 to extend and retract through the connecting pin 27, thereby detecting the rotation of the main valve core 3, obtaining the opening of the valve flap 13 and feeding back to control the voice coil motor 5 to act again. Specifically, when the valve flap 13 rotates to a position greater than the required valve opening, the voice coil motor 5 is controlled to act, driving the control valve core 4 to move, so that the flow area of ​​the damping groove 17 increases, and under the action of the second damping 28 and the damping groove 17, more oil in the first annular groove 10 flows through the damping groove 17 to the second annular groove 11 and flows through the fourth flow channel 32 to the return port 9, thereby reducing the oil pressure in the front chamber 19 and the rear chamber 20, and then under the action of the torsion spring 12, the swing plate 14 is driven by the main valve core 3 to rotate in the direction close to the front chamber 19, that is, Figure 2As shown, the valve flap 13 rotates counterclockwise to reduce the valve opening; when the valve flap 13 rotates to a position smaller than the required valve opening, the voice coil motor 5 is controlled to act, driving the control valve core 4 to move, so that the flow area of ​​the damping groove 17 is reduced. Under the action of the second damping 28 and the damping groove 17, the oil in the first annular groove 10 that flows through the damping groove 17 to the second annular groove 11 is reduced, thereby increasing the oil pressure in the front cavity 19 and the rear cavity 20, overcoming the force of the torsion spring 12 and pushing the swing plate 14 to rotate in a direction away from the front cavity 19, that is, Figure 2 As shown, the valve core 3 rotates clockwise, thereby driving the valve flap 13 to rotate through the main valve core 3 and increasing the valve opening. In this way, the main valve core 3 can be quickly adjusted and maintained at the desired position through continuous feedback of the rotation of the main valve core 3 by the sensor 24 and continuous control of the voice coil motor 5.

[0055] When the control oil at the control port 8 experiences pressure fluctuations and the pressure suddenly rises, the oil pressure at the control port 8 is transmitted to the front chamber 19 through the second damping 28, the first flow channel 29, the first annular groove 10, and the second flow channel 30. The oil in the front chamber 19 acts on the fan-shaped plate 14a of the swing plate 14 to push the swing plate 14 to drive the main valve core 3 to rotate by overcoming the force of the torsion spring 12, that is, Figure 2 As shown, the one-way flow block 18 rotates clockwise, and the one-way flow block 18 is kept in the blocking position of the flow passage 23 under the action of the spring 22, that is, Figure 2 The position of the one-way flow block 18 is shown, so that the front chamber 19 and the rear chamber 20 are connected only through the first damper 21, so that the pressure in the rear chamber 20 rises slower than the pressure in the front chamber 19. As a result, the volume of the rear chamber 20 is instantly increased with the instantaneous rotation of the swing plate 14, and the oil pressure in the rear chamber 20 drops rapidly, preventing the swing plate 14 from rotating. Only when the pressure in the front chamber 19 continues to rise can the swing plate 14 continue to rotate and open the valve flap 13. On the contrary, when the control oil at the control port 8 has pressure fluctuations and the pressure suddenly drops, the oil pressure in the front chamber 19 drops first, causing the swing plate 14 to rotate toward the front chamber 19 under the action of the torsion spring 12, that is, Figure 2 As shown, the one-way flow block 18 rotates counterclockwise, and the one-way flow block 18 is kept in the blocking position of the flow passage 23 under the action of the spring 22, that is, Figure 2 The position of the one-way flow block 18 is shown, so that the front chamber 19 and the rear chamber 20 are connected only through the first damper 21. Under the action of the first damper 21, the oil pressure in the rear chamber 20 increases rapidly, preventing the rotation of the swing plate 14, thereby delaying the rotation of the valve disc 13 when the control oil pressure fluctuates.

[0056] When it is necessary to control the main valve core 3 to be closed, the voice coil motor 5 is controlled to work to drive the control valve core 4 to move, so that the flow area between the damping groove 17 connecting the first annular groove 10 and the second annular groove 11 is maximized, so that the oil pressure in the front chamber 19 drops rapidly and forms a sufficiently large pressure difference with the rear chamber 20. The pressure difference will push the one-way flow block 18 to overcome the force of the reed 22 and move toward the front chamber 19, so that the one-way flow block 18 is separated from the abutment with the positioning step in the valve sleeve 1, and the blockage of the flow channel 23 is released to connect the front chamber 19 and the rear chamber 20, so that the oil in the rear chamber 20 quickly enters the front chamber 19 and flows to the return port 9 through the second flow channel 30, the first annular groove 10, the damping groove 17 and the fourth flow channel 32, so that the swing plate 14 is quickly rotated toward the front chamber 19 under the action of the torsion spring 12, and drives the valve disc 13 to quickly block the first working port 6, thereby completing the rapid closing of the main valve core 3.

Claims

1. A two-stage large-diameter plug-in throttle valve driven by a voice coil motor, characterized in that: The invention comprises a valve sleeve, a valve cover, a main valve core, a control valve core and a voice coil motor, wherein one end of the valve sleeve is connected to the valve cover, a first working port is arranged on the outer circumferential surface of the valve sleeve, a second working port is arranged on the other end of the valve sleeve, a control port, a reflux port, a first annular groove and a second annular groove are arranged on the valve cover, the main valve core is arranged in the valve sleeve by rotation through a torsion spring, a valve flap and a swing plate are arranged on the main valve core, the valve flap and the swing plate can rotate synchronously with the main valve core, the valve flap can control the on-off between the first working port and the second working port with the rotation of the main valve core, and the torsion spring can drive the main valve core to drive the valve flap to rotate to cut off the first working port The working port and the second working port are connected, a control chamber and a reflux chamber are respectively formed on both sides of the swing plate, the control chamber is connected to the control port, and the reflux chamber is connected to the reflux port, the voice coil motor is arranged on the valve cover, and the extended end of the voice coil motor is connected to the control valve core to drive the control valve core to reciprocate in the valve cover, a damping groove is arranged on the control valve core, and the damping groove can change the flow area between the first annular groove and the second annular groove with the reciprocating movement of the control valve core, the first annular groove is connected to the control port, and the second annular groove is connected to the reflux port; a second damping is arranged at the inlet position of the control port; The throttle valve also includes a one-way flow block; the one-way flow block is located in the control chamber, dividing the control chamber into a front chamber and a rear chamber, the swing plate simultaneously forms a part of the front chamber and a part of the rear chamber, the front chamber and the rear chamber are connected through a first damping, and the control port is connected to the front chamber.

2. The two-stage large-diameter plug-in throttle valve driven by a voice coil motor according to claim 1 is characterized in that: The one-way flow block adopts a fan-shaped shell structure and is coaxially rotatable with the main valve core. One end along the circumferential direction toward the swing plate is open. A fan-shaped plate coaxial with the main valve core and extending toward the front cavity is provided in the swing plate near the main valve core. The one-way flow block is arranged on the outside of the fan-shaped plate; the part of the swing plate aligned with the open end of the one-way flow block forms the rear cavity, and the fan-shaped plate on the swing plate and the other end of the one-way flow block along the circumferential direction form the front cavity.

3. The two-stage large-diameter plug-in throttle valve driven by a voice coil motor according to claim 2 is characterized in that: The area of ​​a portion of the swing plate forming the rear cavity is larger than the area of ​​a portion of the swing plate forming the front cavity.

4. The two-stage large-diameter plug-in throttle valve driven by a voice coil motor according to claim 2 is characterized in that: A flow channel is provided on the outer circumferential surface of the one-way flow block; the one-way flow block can rotate toward the direction approaching the front cavity to connect the two ends of the flow channel with the front cavity and the rear cavity respectively; the one-way flow block can rotate away from the front cavity and abut against the valve sleeve to block the flow channel.

5. The two-stage large-diameter plug-in throttle valve driven by a voice coil motor according to claim 4 is characterized in that: The throttle valve also includes a reed; the reed is located in the front chamber, the reed is connected to the one-way flow block, the reed can drive the one-way flow block to rotate in a direction away from the front chamber until the flow channel is blocked, and the oil in the rear chamber can push the one-way flow block to move in a direction close to the front chamber until the flow channel connects the front chamber and the rear chamber.

6. The two-stage large-diameter plug-in throttle valve driven by a voice coil motor according to claim 1, characterized in that: The throttle valve also includes a sensor; the sensor is connected to the main valve core to detect the rotation angle of the main valve core.

7. The two-stage large-diameter plug-in throttle valve driven by a voice coil motor according to claim 6, characterized in that: The throttle valve also includes a transmission plate, one end of which is sleeved and fixed on the protruding end of the main valve core, and the other end of the transmission plate is provided with a transmission groove along the radial direction of the main valve core. The sensor adopts a displacement sensor and the telescopic end of the sensor is provided with a connecting pin extending into the transmission groove.

8. The two-stage large-diameter plug-in throttle valve driven by a voice coil motor according to any one of claims 1 to 7, characterized in that: The extended end of the voice coil motor is rotatably connected to the control valve core, so that the control valve core can rotate around its own axis.

9. The two-stage large-diameter plug-in throttle valve driven by a voice coil motor according to any one of claims 1 to 7, characterized in that: The second damping adopts fixed damping.

Images