A high speed reversing valve for amplifying the frequency of the reversing by a rotary valve

Abstract

The application belongs to the technical field of fluid transmission and control, and discloses a high-speed reversing valve with a rotary valve for amplifying a reversing frequency, which comprises a main valve body and a pilot valve body, and a pilot valve core is arranged in the pilot valve; a low-pressure oil return port is arranged on the pilot valve body and is communicated with a low-pressure oil outlet; a pilot valve sleeve is arranged outside the pilot valve core in the pilot valve body; a first oil hole and a second oil hole are arranged on the pilot valve sleeve; the first oil hole and the second oil hole are arranged in a staggered manner in the axial direction of the pilot valve sleeve; an oil groove is arranged on the pilot valve core and is communicated with the low-pressure oil return port; the pilot valve core is connected with a driving device for driving the rotation of the pilot valve core; and the oil groove is rotatable and can be aligned and communicated with the first oil hole and the second oil hole, respectively. Compared with the prior art, the reversing valve adopts a rotary valve type pilot valve, the internal oil circuit of the valve body is arranged skillfully, the high-frequency reversing of the reversing valve is realized, the overall structure of the reversing valve is simple, the reversing process is stable and reliable, and the reversing valve can be applied to a high-precision electro-hydraulic control system.

Description

Technical Field

[0001] The invention belongs to the technical field of fluid transmission and control, and particularly discloses a high-speed reversing valve which amplifies the reversing frequency through a rotary valve. Background Art

[0002] Hydraulic reversing valves, among other fluid control valves, control flow and pressure and switch oil circuits. For example, solenoid reversing valves also control flow and switch oil circuits. Currently, hydraulic solenoid reversing valves on the market are categorized by diameter: 6-diameter, 10-diameter, 16-diameter, and larger (25, 32, etc.).

[0003] Fluid control valves for small flow rates are generally in the form of single-stage direct-acting valves, that is, 6-diameter and 10-diameter hydraulic solenoid reversing valves are generally direct-acting valves (the electromagnetic force generated by the electromagnet directly pushes the main valve core); fluid control valves for large flow rates must adopt the form of two-stage valves to overcome the hydraulic force exerted on the valve core when opening the valve core, and use hydraulic pressure to push the valve core, that is, 16-diameter and above (25, 32, etc.) hydraulic solenoid reversing valves generally adopt the form of two-stage valves (a valve is superimposed on the main stage as a pilot valve to drive the power stage valve core with hydraulic pressure).

[0004] Existing fluid control valves for small flow rates typically have a structure including a valve body, a valve core, and an electromagnetic drive device. The valve body is provided with a high-pressure oil inlet, a low-pressure oil outlet, and two control oil ports. The electromagnetic drive device controls the axial displacement of the valve core within the valve body, thereby causing the two control oil ports to be connected to the high-pressure oil inlet and the low-pressure oil outlet, respectively, or the two control oil ports to be connected to the low-pressure oil outlet and the high-pressure oil inlet, respectively, or the two control oil ports, the high-pressure oil inlet, and the low-pressure oil outlet to be isolated from each other. This direct-acting valve is generally used to control small flow rates. When the flow rate increases, the electromagnetic thrust must be increased to overcome the hydraulic force generated by the fluid flow on the valve core when the valve core is opened, which blocks the movement of the valve core.

[0005] Existing technology increases the electromagnetic thrust by increasing the size of the electromagnetic drive device or the input current to achieve the desired effect on the valve core. For medium- and large-flow fluid control valves, once the valve core is opened, the high-pressure, high-flow fluid flow exerts a significant hydraulic force on the valve core. Simply increasing the electromagnetic thrust is insufficient to address this problem, and a two-stage valve is employed. A two-stage valve superimposes a solenoid valve (typically a 6-way valve) on the main valve body (power stage valve) as a pilot valve. This pilot valve controls the pressure in the left and right chambers of the main valve core, switching the main valve direction and the oil circuit. This solves the problem of opening large-flow reversing valves.

[0006] Fluid control valves for medium and large flow rates can perform high-frequency switching, playing a vital role in key engineering fields such as actuator motion control and high-power, high-frequency excitation. They are well-suited for applications requiring high-precision electro-hydraulic control systems. However, the two-stage valve structure complicates the internal structure of the valve body, reducing its reliability. Furthermore, since the valve core is often driven by an electromagnet, the solenoid coils easily overheat and their thrust is limited, presenting certain limitations in high-power applications. Furthermore, the switching frequency achieved by using an electromagnet to drive the valve core is low, making high-frequency switching impossible with electromagnets. Summary of the Invention

[0007] The purpose of the present invention is to provide a high-speed reversing valve that amplifies the reversing frequency by rotating the valve, so as to solve the problem that the existing medium and large flow fluid control valves have complex structures and the reversing frequency cannot reach a higher frequency.

[0008] In order to achieve the above-mentioned purpose, the basic scheme of the present invention is: a high-speed reversing valve that amplifies the reversing frequency by a rotary valve, comprising a main valve body and a pilot valve body, wherein a main valve core is provided in the main valve body, and a high-pressure oil inlet, a first control oil port, a second control oil port, and a low-pressure oil outlet are provided on the main valve body; a pilot valve core is provided in the pilot valve, and a low-pressure oil return port connected to the low-pressure oil outlet is provided on the pilot valve body; a pilot valve sleeve is provided in the pilot valve body outside the pilot valve core, and a first oil hole and a second oil hole are provided on the pilot valve sleeve, and the first oil hole and the second oil hole are multiple and are respectively arranged along the circumference of the pilot valve sleeve, and the first oil hole and the second oil hole are staggered in the axial direction of the pilot valve sleeve; the left part of the main valve core and the main valve body are provided with a left pilot control chamber, and the right part of the main valve core and the main valve body are provided with a right pilot control chamber; the left pilot control chamber and the first oil hole are connected with the high-pressure oil inlet, and the right pilot control chamber and the second oil hole are connected with the high-pressure oil inlet; an oil groove is provided on the pilot valve core, and the oil groove is connected with the low-pressure oil return port. The pilot valve core is connected to a driving device for driving it to rotate, and the oil groove rotates and can be aligned and connected with the first oil hole and the second oil hole respectively.

[0009] The operating principle of this basic solution is that the basic structure and functions of the main valve body, main valve core, high-pressure oil inlet, first control oil port, second control oil port, and low-pressure oil outlet remain consistent with those of the prior art. The pilot valve body controls the hydraulic oil pressure in the left and right pilot control chambers to enable the main valve core to slide within the valve body. This portion can also adopt the structure of the prior art. Specifically, the main valve core can be displaced relative to the main valve body within the main valve body, enabling the reversing valve to enter a first state in which the high-pressure oil inlet is connected to the first control oil port while the second control oil port is connected to the low-pressure oil outlet. Alternatively, the reversing valve can enter a second state in which the high-pressure oil inlet, first control oil port, second control oil port, and low-pressure oil outlet are disconnected from each other. Furthermore, the reversing valve can enter a third state in which the high-pressure oil inlet is connected to the second control oil port while the first control oil port is connected to the low-pressure oil outlet. Under these conditions, the reversing valve will be in the second state before use, in which the high-pressure oil inlet, first control oil port, second control oil port, and low-pressure oil outlet are disconnected from each other.

[0010] When this reversing valve is in use, high-pressure hydraulic oil can be introduced into the high-pressure oil inlet, and low-pressure hydraulic oil can be introduced into the low-pressure oil outlet. Since the left pilot control chamber and the first oil hole are connected to the high-pressure oil inlet, and the right pilot control chamber and the second oil hole are connected to the high-pressure oil inlet, the first oil hole and the left pilot control chamber, as well as the second oil hole and the right pilot control chamber, will be filled with high-pressure hydraulic oil, respectively, while maintaining a high pressure state. Since the low-pressure oil outlet is connected to the low-pressure oil return port, and the oil tank is connected to the low-pressure oil return port, both the low-pressure oil return port and the oil tank are filled with low-pressure hydraulic oil. At this point, the hydraulic oil pressure within the reversing valve is balanced, and the reversing valve remains in the second state.

[0011] When the reversing valve is in use, the pilot valve core can be driven to rotate by the driving device. During the rotation of the pilot valve core, when the first oil hole and the oil groove are aligned and connected, the high-pressure hydraulic oil in the first oil hole enters the oil groove and the low-pressure oil return port under the action of pressure to release the pressure, and the high-pressure hydraulic oil pressure of the left pilot control chamber is released accordingly. At this time, the right pilot control chamber still contains high-pressure hydraulic oil. The pressure difference between the hydraulic oil in the left pilot control chamber and the right pilot control chamber can drive the main valve core to move to the left, and then the reversing valve appears in the first state or the third state.

[0012] As the pilot valve core rotates, the first oil hole will be disconnected from the oil groove, and the hydraulic oil in the first oil hole and the left pilot control chamber will continue to maintain high pressure. Because the first oil hole and the second oil hole are axially offset in the pilot valve sleeve, after the first oil hole is disconnected from the oil groove, the second oil hole will align and connect with the oil groove. At this time, the high-pressure hydraulic oil in the second oil hole will enter the oil groove and the low-pressure return oil port to release pressure, and the high-pressure hydraulic oil pressure in the right pilot control chamber will be released. At this time, the left pilot control chamber is filled with high-pressure hydraulic oil. The pressure difference between the hydraulic oil in the left and right pilot control chambers can drive the main valve core to the right, thereby causing this control valve to enter the opposite state of the previous step, that is, the third state or the first state (if the control valve in the previous step is in the first state, the control valve in this step will enter the third state), thereby achieving oil circuit switching.

[0013] Since there are multiple first oil holes and second oil holes and they are respectively arranged along the circumference of the pilot valve sleeve, when the pilot valve core rotates one circle, the oil groove will be connected with the first oil hole and the second oil hole multiple times, respectively, to achieve multiple switching of the oil circuit state of the reversing valve, thereby achieving multiple reversals of the reversing valve and increasing the reversing frequency of the reversing valve.

[0014] The beneficial effects of this basic solution are:

[0015] 1. The pilot valve in this solution adopts a rotary valve structure, which is easy to use a simple power source commonly used in the industry to directly drive the pilot valve core to rotate. For example, a servo motor is used to drive the pilot valve core to rotate. There is no need to set up a complex electromagnet structure, which can make the internal structure of this reversing valve relatively simple.

[0016] 2. In this solution, the existing drive mechanism is used to drive the pilot valve core to rotate, so that only hydraulic transmission exists in the valve body, reducing the interference of the electromagnet and related structures, thereby greatly increasing the reliability of the reversing valve. At the same time, it also makes the interior of the valve body of the reversing valve more stable when achieving high-speed reversing.

[0017] 4. In this solution, multiple first oil holes and second oil holes are staggered on the pilot valve sleeve to achieve multiple oil circuit state switching controls by rotating the pilot valve core one circle. According to the number of the first oil holes or the second oil holes, the switching frequency of the reversing valve is amplified, thereby greatly increasing the switching frequency of the reversing valve.

[0018] 4. The rotary valve type pilot valve is used in this solution. The switching frequency of the reversing valve can be increased by selecting different drive devices. For example, servo motors with different speeds can be used to increase the switching frequency of the reversing valve. At the same time, the switching frequency of the reversing valve can be increased again through multiple first oil holes and second oil holes, thereby enabling the reversing valve to achieve a higher switching frequency. The reversing valve can be used in high-precision electro-hydraulic control systems.

[0019] 5. In this solution, the pilot valve adopts half-bridge drive for the main valve instead of full-bridge drive. In this way, only two variable throttle ports need to be designed instead of four throttle edges, making the pilot valve structure simpler and easier to process. At the same time, the pilot valve controls the pressure on the left and right sides of the main valve core only by rotating the main valve core to achieve alternating high and low pressure in the left pilot control chamber or the right pilot control chamber, thereby driving the main valve core and reversing the direction of the reversing valve. This structure is simple and ingenious, easy to manufacture, and the structural coordination required during use is easier to achieve.

[0020] Compared with the existing technology, this reversing valve adopts a rotary valve-type pilot valve, and through the ingenious arrangement of the oil circuit inside the valve body, a higher frequency reversing of the reversing valve is achieved. The overall structure of the reversing valve is simple, the reversing process is stable and reliable, and it can be used in high-precision electro-hydraulic control systems.

[0021] Furthermore, there are 10-30 first oil holes and second oil holes respectively, the first oil holes and the second oil holes have the same diameter and the same number, all the first oil holes are evenly spaced, and all the second oil holes are evenly spaced.

[0022] The number of the first oil holes and the second oil holes represents the number of times the reversing valve can be reversed when the pilot valve core rotates once. Setting the first oil holes and the second oil holes to 10-30 can largely meet the higher frequency reversing of the reversing valve and also make the design of the reversing valve more reasonable.

[0023] Furthermore, there are 20 first oil holes and 20 second oil holes respectively, and there are two oil grooves, which are symmetrically arranged on the pilot valve core.

[0024] Providing 20 first and second oil holes allows the reversing valve to reversal 20 times per one rotation of the pilot valve core, achieving a high reversing frequency and facilitating the design and manufacture of the first and second oil holes. Aligning the oil groove with either the first or second oil hole releases the oil pressure in the corresponding hole, making a design with two holes more reasonable.

[0025] Furthermore, a first oil circuit is provided on the main valve body, the right pilot control chamber is connected to the high-pressure oil inlet through the first oil circuit, and a right throttle is provided in the first oil circuit; a second oil circuit is provided on the main valve body, the left pilot control chamber is connected to the high-pressure oil inlet through the second oil circuit, and a left throttle is provided in the second oil circuit.

[0026] The design of the first oil circuit and the second oil circuit makes the layout of the oil circuit in the reversing valve more reasonable. The setting of the throttle and the right throttle can prevent the reverse flow of high-pressure hydraulic oil from affecting the use of the reversing valve.

[0027] Furthermore, two low-pressure oil return ports are symmetrically provided between the pilot valve body and the pilot valve sleeve. The pilot valve sleeve and the two ends of the pilot valve core form cavities respectively connected to the two low-pressure oil return ports. The pilot valve sleeve is provided with a through hole connecting the cavity and the low-pressure oil return port.

[0028] The arrangement of the two low-pressure oil return ports, the cavity, and the through-hole structure is more conducive to the switching of the oil circuit in the reversing valve after the first oil hole or the second oil hole is connected to the oil tank, so that the internal structure layout of the pilot valve of the reversing valve is reasonable, easy to manufacture, and more stable during use.

[0029] Furthermore, two high-pressure oil return ports are symmetrically provided between the pilot valve body and the pilot valve sleeve. The first oil hole and the left pilot control chamber, and the second oil hole and the right pilot control chamber are respectively connected through the two high-pressure oil return ports. The two high-pressure oil return ports are located between the two low-pressure oil return ports. An O-ring is provided at the contact connection between the pilot valve body and the pilot valve sleeve.

[0030] The design of two high-pressure oil return ports facilitates communication between the first oil hole and the left pilot chamber and the high-pressure oil inlet, and between the second oil hole and the right pilot chamber and the high-pressure oil inlet. This creates a more rational layout of the high-pressure and low-pressure oil return ports, facilitating directional control of the reversing valve. O-rings ensure a sealed isolation between the two high-pressure and low-pressure oil return ports, preventing oil cross-contamination.

[0031] Furthermore, there are two low-pressure oil outlets that are interconnected, and a third oil circuit is provided on the main valve body between the two low-pressure oil outlets. The two low-pressure oil outlets are arranged on both sides of the main valve body, and the high-pressure oil inlet is arranged in the middle of the main valve body. The first control oil port and the second control oil port are respectively arranged between the two low-pressure oil outlets and the high-pressure oil inlet.

[0032] This design can make the structure of the main valve core, high-pressure oil inlet, first control oil port, second control oil port and low-pressure oil outlet simple and easy to implement, and the arrangement is reasonable.

[0033] Furthermore, the main valve core is provided with a first convex ring, a second convex ring, a third convex ring and a fourth convex ring in sequence along the axial direction for sliding and sealing cooperation with the main valve body, and the second convex ring and the third convex ring are respectively provided corresponding to the first control oil port and the second control oil port.

[0034] The first convex ring, the second convex ring, the third convex ring and the fourth convex ring can realize the respective arrangement of the left pilot control cavity, the right pilot control cavity, the high-pressure oil inlet, the first control oil port, the second control oil port and the two low-pressure oil outlets.

[0035] Furthermore, the pilot valve body and the main valve body are provided with a fourth oil circuit connecting the right pilot control chamber and the high-pressure oil return port, and the pilot valve body and the main valve body are provided with a fifth oil circuit connecting the left pilot control chamber and the high-pressure oil return port; the pilot valve body and the main valve body are respectively provided with a sixth oil circuit and a seventh oil circuit connecting the low-pressure oil outlet and the low-pressure oil return port on the same side.

[0036] The design of the fourth oil circuit, the fifth oil circuit, the sixth oil circuit and the seventh oil circuit can make the internal structure layout of the reversing valve reasonable, easy to manufacture and more stable during use.

[0037] Furthermore, the driving device is a servo motor, and one end of the pilot valve core extends out of the pilot valve body and is connected to the output shaft of the servo motor.

[0038] Servo motors are more common in the market, with more mature technology and lower cost. As a widely used industrial product, servo motors have proven their reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A schematic diagram of a high-speed reversing valve that amplifies the reversing frequency by rotating a valve according to the present invention;

[0040] Figure 2 This is a longitudinal cross-sectional view (second state) of a high-speed reversing valve that amplifies the reversing frequency by rotating the valve according to the present invention;

[0041] Figure 3 yes Figure 2 Transverse cross-sectional view of the main valve body at AA in the middle;

[0042] Figure 4 yes Figure 2 Transverse cross-sectional view of the pilot valve body at the middle BB;

[0043] Figure 5 yes Figure 3 Longitudinal section view at CC;

[0044] Figure 6 This is a longitudinal cross-sectional view of a first state diagram of a high-speed reversing valve that amplifies the reversing frequency by rotating a valve according to the present invention;

[0045] Figure 7 It is a longitudinal cross-sectional view of a third state diagram of a high-speed reversing valve that amplifies the reversing frequency by rotating a valve according to the present invention;

[0046] Figure 8 It is a structural diagram of the pilot valve core;

[0047] Figure 9 It is a structural diagram of the pilot valve body;

[0048] Figure 10 It is a structural diagram of the main valve core. DETAILED DESCRIPTION

[0049] The following is further described in detail through specific implementation methods:

[0050] Detailed description of the drawings: The accompanying drawings in the specification include: main valve body 10, high-pressure oil inlet 11, first control oil port 12, second control oil port 13, low-pressure oil outlet 14, third oil circuit 15, left pilot control chamber 21, right pilot control chamber 22, first oil circuit 23, second oil circuit 24, left throttle 25, right throttle 26, main valve core 30, first convex ring 31, second convex ring 32, third convex ring 33, fourth convex ring 34, pilot valve body 40, high-pressure oil return port 41, fourth oil circuit 42, fifth oil circuit 43, low-pressure oil return port 44, sixth oil circuit 45, seventh oil circuit 46, O-ring 47, pilot valve sleeve 50, through hole 51, first oil hole 52, second oil hole 53, pilot valve core 60, oil groove 61, cavity 62.

[0051] It should be noted that all expressions such as first, second, etc. in the embodiments of the present invention are used to distinguish two entities with the same name but different names or different parameters. It can be seen that first, second, etc. are only for the convenience of expression and should not be understood as limitations on the embodiments of the present invention. Subsequent embodiments will not explain this one by one.

[0052] The terms used herein, such as "up," "down," "front," "back," "left," "right," "inside," "outside," "top," "bottom," and "side," are intended solely to refer to the accompanying drawings. These terms are intended to facilitate understanding of the present invention and are not intended to limit its scope.

[0053] Example 1

[0054] like Figure 1 As shown, a high-speed reversing valve that amplifies the switching frequency by rotating a valve comprises a main valve body 10 and a pilot valve body 40, with the pilot valve body 40 positioned above the main valve body 10. A main valve core 30 slides within the main valve body 10, a pilot valve sleeve 50 is disposed within the pilot valve, and a pilot valve core 60 rotates within the pilot valve sleeve 50. The end of the pilot valve core 60 extends out of the pilot valve body 40, and a drive device (not shown) is disposed outside the pilot valve body 40 to drive the pilot valve core 60 in rotation. The drive device drives the pilot valve core 60 to rotate, thereby controlling the pressure on both sides of the main valve core 30 and driving the main valve core 30 to slide within the main valve body 10, achieving reversal of the reversing valve.

[0055] like Figure 2 、 Figure 3As shown, the main valve body 10 is provided with a high-pressure oil inlet 11, a first control oil port 12, a second control oil port 13, and a low-pressure oil outlet 14. There are two low-pressure oil outlets 14 that are interconnected. The main valve body 10 is provided with a third oil passage 15 that is used to connect the two low-pressure oil outlets 14. The two low-pressure oil outlets 14 are symmetrically arranged on either side of the main valve body 10. The high-pressure oil inlet 11 is located in the middle of the main valve body 10. The first control oil port 12 is located between the low-pressure oil outlet 14 and the high-pressure oil inlet 11 on the left side, and the second control oil port 13 is located between the high-pressure oil inlet 11 and the low-pressure oil outlet 14 on the right side.

[0056] like Figure 10 As shown, the main valve core 30 is provided with a first convex ring 31, a second convex ring 32, a third convex ring 33, and a fourth convex ring 34 in sequence along the axial direction to cooperate with the main valve body 10 for sliding sealing. When the main valve core 30 is at the center position of the main valve body 10, the second convex ring 32 corresponds to the first control oil port 12 and can block the first control oil port 12, the third convex ring 33 corresponds to the second control oil port 13 and can block the second control port, the high-pressure oil inlet 11 is located on the main valve body 10 between the second convex ring 32 and the third convex ring 33, the left low-pressure oil outlet 14 is located on the main valve body 10 between the first convex ring 31 and the second convex ring 32, and the right low-pressure oil outlet 14 is located on the main valve body 10 between the third convex ring 33 and the fourth convex ring 34.

[0057] The left side of the main valve core 30, the left side of the first raised ring 31, and the main valve body 10 form a left pilot chamber 21. The right side of the main valve core 30, the right side of the fourth raised ring 34, and the main valve body 10 form a right pilot chamber 22. The main valve core 30 can slide between the left and right pilot chambers 21 and 22 within the main valve body 10. A first oil passage 23 is provided in the main valve body 10, connecting the right pilot chamber 22 to the high-pressure oil inlet 11 through the first oil passage 23. A right throttle 26 is disposed in the first oil passage 23. A second oil passage 24 is provided in the main valve body 10, connecting the left pilot chamber 21 to the high-pressure oil inlet 11 through the second oil passage 24. A left throttle 25 is disposed in the second oil passage 24.

[0058] like Figure 4 As shown, two low-pressure oil return ports 44 and two high-pressure oil return ports 41 are symmetrically arranged between the pilot valve body 40 and the pilot valve sleeve 50. The two low-pressure oil return ports 44 are symmetrically arranged along the center of the pilot valve body 40, and the two high-pressure oil return ports 41 are symmetrically arranged along the center of the pilot valve body 40, with the two high-pressure oil return ports 41 located between the two low-pressure oil return ports 44. To prevent oil from flowing between the low-pressure oil return port 44 and the two high-pressure oil return ports 41, an O-ring 47 is provided at the contact point between the pilot valve body 40 and the pilot valve sleeve 50.

[0059] like Figure 5As shown, a sixth oil passage 45 is provided on the right side of the pilot valve body 40 and the main valve body 10, connecting the right low-pressure oil return port 44 and the right low-pressure oil outlet port 14. A seventh oil passage 46 is provided on the left side of the pilot valve body 40 and the main valve body 10, connecting the left low-pressure oil return port 44 and the left low-pressure oil outlet port 14. The pilot valve sleeve 50 is sealed in the middle of the pilot valve core 60, forming a cavity 62 at both ends of the pilot valve core 60. The pilot valve sleeve 50 is provided with a through hole 51 connecting the cavity 62 and the low-pressure oil return port 44. That is, the left low-pressure oil outlet 14, the seventh oil circuit 46, the left low-pressure oil return port 44, the through hole 51, and the left cavity 62 are connected, as well as the right low-pressure oil outlet 14, the sixth oil circuit 45, the right low-pressure oil return port 44, the through hole 51, and the right cavity 62 are connected, and the left low-pressure oil outlet 14 and the right low-pressure oil outlet 14 are connected through the third oil circuit 15.

[0060] A plurality of first oil holes 52 are defined in a circle on the pilot valve sleeve 50 corresponding to the left high-pressure oil return port 41. A plurality of second oil holes 53 are defined in a circle on the pilot valve sleeve 50 corresponding to the right high-pressure oil return port 41. In this embodiment, to ensure a high switching frequency for the reversing valve, preferably there are 10 to 30 first oil holes 52 and 10 to 30 second oil holes 53, respectively. The first and second oil holes 52, 53 have the same diameter and number and are arranged uniformly along the circumference of the pilot valve sleeve 50. The first and second oil holes 52, 53 are staggered in the axial direction of the pilot valve sleeve 50.

[0061] An oil groove 61 is provided on the pilot valve spool 60. This groove 61 communicates with the low-pressure oil return port 44 via a cavity 62 and a through-hole 51. Rotation of the oil groove 61 aligns and connects it with the first oil hole 52 and the second oil hole 53, respectively. A fourth oil passage 42 is provided on the pilot valve body 40 and the main valve body 10, connecting the right pilot control chamber 22 and the high-pressure oil return port 41. A fifth oil passage 43 is provided on the pilot valve body 40 and the main valve body 10, connecting the left pilot control chamber 21 and the high-pressure oil return port 41. Rotation of the pilot valve spool 60 establishes communication between the oil groove 61, the first through-hole 51, the left high-pressure oil return port 41, the fifth oil passage 43, and the left pilot control chamber 21, or between the oil groove 61, the second through-hole 51, the right high-pressure oil return port 41, the fourth oil passage 42, and the right pilot control chamber 22.

[0062] The specific implementation process is as follows: when the reversing valve is in use, high-pressure hydraulic oil needs to be filled into the high-pressure oil inlet 11 and low-pressure hydraulic oil needs to be introduced into the low-pressure oil outlet 14. At this time, the second oil circuit 24, the left throttle 25, the left pilot control chamber 21, the fifth oil circuit 43, the left high-pressure oil return port 41, and the first oil hole 52 on the left side of the reversing valve, which are connected in sequence with the high-pressure oil inlet 11, are all filled with high-pressure hydraulic oil, and the seventh oil circuit 46, the left low-pressure oil return port 44, the left through hole 51, and the left cavity 62, which are connected in sequence with the left low-pressure oil outlet 14, are all filled with low-pressure hydraulic oil; the first oil circuit 23, the right throttle 26, the right pilot control chamber 22, the fourth oil circuit 42, the right high-pressure oil return port 41, and the second oil hole 53 on the right side of the reversing valve, which are connected in sequence with the high-pressure oil inlet 11, are all filled with high-pressure hydraulic oil, and the sixth oil circuit 45, the right low-pressure oil return port 44, the right through hole 51, and the right cavity 62, which are connected in sequence with the right low-pressure oil outlet 14, are all filled with low-pressure hydraulic oil. When the pilot valve core 60 does not rotate and the first oil hole 52 and the second oil hole 53 are not aligned with the oil groove 61, the pressure of the hydraulic oil filled in the reversing valve is balanced. Therefore, the reversing valve is in the second state in which the high-pressure oil inlet 11, the first control oil port 12, the second control oil port 13, and the low-pressure oil outlet 14 are isolated from each other.

[0063] The reversing valve can be used to drive the pilot valve core 60 to rotate by the driving device. During the rotation of the pilot valve core 60, the first oil hole 52 and the second oil hole 53 will be aligned with the oil groove 61 in sequence. Figure 6 As shown, when the first oil hole 52 and the oil groove 61 are aligned and connected, under the action of the pressure of the high-pressure hydraulic oil in the first oil hole 52, the high-pressure hydraulic oil will enter the oil groove 61, the left cavity 62 and the left low-pressure oil return port 44 in sequence to release the pressure; so that the high-pressure hydraulic oil pressure in the left pilot control chamber 21 is released accordingly, while at this time there is still high-pressure hydraulic oil in the right pilot control chamber 22. The pressure difference of the hydraulic oil in the left pilot control chamber 21 and the right pilot control chamber 22 can drive the main valve core 30 to move to the left, thereby causing the reversing valve to enter the first state in which the high-pressure oil inlet 11 is connected to the first control oil port 12 and the second control oil port 13 is connected to the right low-pressure oil outlet 14.

[0064] As the pilot valve core 60 rotates, the first oil hole 52 will be disconnected from the oil groove 61, and the second oil hole 53 will be aligned and connected to the oil groove 61. Figure 7As shown, under the action of the pressure of the high-pressure hydraulic oil in the second oil hole 53, the high-pressure hydraulic oil will enter the oil groove 61, the right cavity 62 and the right low-pressure oil return port 44 in sequence to release the pressure; the high-pressure hydraulic oil pressure in the right pilot control chamber 22 is released accordingly, while at this time the left pilot control chamber 21 still contains high-pressure hydraulic oil. The pressure difference between the hydraulic oil in the left pilot control chamber 21 and the right pilot control chamber 22 can drive the main valve core 30 to move rightward, thereby causing the reversing valve to enter the third state in which the high-pressure oil inlet 11 is connected to the second control oil port 13 and the first control oil port 12 is connected to the left low-pressure oil outlet 14.

[0065] In this embodiment, the number of first and second oil holes 52, 53 is 10-30, respectively. These holes are of equal diameter and number and are evenly spaced along the circumference of the pilot valve sleeve 50. With each rotation of the pilot valve core 60, the oil groove 61 connects with the first and second oil holes 52, 53 10-30 times (this number corresponds to the number of first and second oil holes 52, 53). This allows the reversing valve to switch between oil circuit states 10-30 times, thereby rapidly increasing the reversing frequency of the reversing valve. The reversing valve can also utilize drive devices with different speeds to increase the reversing frequency of the reversing valve.

[0066] By adjusting the rotational speed of the external drive device and the number of the first oil holes 52 and the second oil holes 53, the switching frequency of the reversing valve is amplified twice, enabling the reversing valve to achieve a relatively high switching frequency, thereby enabling the reversing valve to be used in high-precision electro-hydraulic control systems. Furthermore, although the reversing valve is a two-stage valve, the valve body does not have a drive structure designed inside. The drive device is installed externally and utilizes a half-bridge drive. This simplifies the layout of the oil circuits and ports within the valve body and ensures a better seal, thereby enabling the reversing valve to support applications with high switching frequencies.

[0067] Example 2

[0068] The difference between this embodiment and embodiment 1 is that Figure 8 As shown, the oil grooves 61 are preferably provided in pairs, and the two oil grooves 61 are symmetrically arranged on the pilot valve core 60. Figure 9 As shown, in this embodiment, 20 first oil holes 52 and 20 second oil holes 53 are respectively provided.

[0069] Providing 20 first oil holes 52 and second oil holes 53 allows the reversing valve to reversal 20 times per rotation of the pilot valve core 60, achieving a relatively high and suitable reversing frequency. This also facilitates the design and manufacture of the first oil holes 52 and second oil holes 53. When the oil groove 61 is aligned with the first oil hole 52 or the second oil hole 53, the oil pressure in the corresponding oil hole is released. Therefore, designing two oil grooves 61 is more reasonable.

[0070] Example 3

[0071] The difference between this embodiment and embodiment 1 is that in this embodiment, the driving device preferably adopts a servo motor, which is arranged on the left or right side outside the pilot valve body 40, and the output shaft of the servo motor is fixedly connected to the pilot valve core 60 extending out from the end of the pilot valve body 40.

[0072] In this embodiment, the drive device is a servo motor. As a widely used industrial product, servo motors have proven reliability and a simpler structure than other drive devices. Servo motors offer a wide range of speed options, allowing users to select the appropriate servo motor speed to achieve different speeds of reversing in this reversing valve.

[0073] The above is only an embodiment of the present invention, and the common knowledge such as the specific technical solutions and / or characteristics in the solution are not described in detail here. It should be pointed out that for those skilled in the art, without departing from the technical solution of the present invention, several variations and improvements can be made, which should also be regarded as the scope of protection of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the description can be used to interpret the content of the claims.

Claims

1. A high-speed reversing valve that amplifies the reversing frequency by means of a rotary valve, comprising a main valve body and a pilot valve body, wherein the main valve body is provided with a main valve core, and the main valve body is provided with a high-pressure oil inlet, a first control oil port, a second control oil port, and a low-pressure oil outlet; the pilot valve is provided with a pilot valve core, and the pilot valve body is provided with a low-pressure oil return port connected to the low-pressure oil outlet; characterized in that: A pilot valve sleeve is provided in the pilot valve body and outside the pilot valve core, and a first oil hole and a second oil hole are provided on the pilot valve sleeve. There are multiple first oil holes and second oil holes and they are respectively arranged along the circumference of the pilot valve sleeve, and the first oil hole and the second oil hole are staggered in the axial direction of the pilot valve sleeve; the left part of the main valve core and the main valve body are provided with a left pilot control chamber, and the right part of the main valve core and the main valve body are provided with a right pilot control chamber; the left pilot control chamber and the first oil hole are connected with the high-pressure oil inlet, and the right pilot control chamber and the second oil hole are connected with the high-pressure oil inlet; an oil groove is provided on the pilot valve core, and the oil groove is connected with the low-pressure oil return port. The pilot valve core is connected to a driving device for driving it to rotate, and the oil groove can be aligned and connected with the first oil hole and the second oil hole respectively when it rotates.

2. A high-speed reversing valve for amplifying the reversing frequency by rotating a valve according to claim 1, characterized in that: There are 10 to 30 first oil holes and 10 to 30 second oil holes, respectively. The first oil holes and the second oil holes have the same diameter and the same number. All the first oil holes are evenly spaced, and all the second oil holes are evenly spaced.

3. A high-speed reversing valve for amplifying the reversing frequency by rotating a valve according to claim 2, characterized in that: There are 20 first oil holes and 20 second oil holes respectively, and there are two oil grooves, which are symmetrically arranged on the pilot valve core.

4. The high-speed reversing valve for amplifying the reversing frequency by rotating the valve according to claim 1, characterized in that: A first oil circuit is provided on the main valve body, the right pilot control chamber is connected to the high-pressure oil inlet through the first oil circuit, and a right throttle is provided in the first oil circuit; a second oil circuit is provided on the main valve body, the left pilot control chamber is connected to the high-pressure oil inlet through the second oil circuit, and a left throttle is provided in the second oil circuit.

5. The high-speed reversing valve for amplifying the reversing frequency by rotating the valve according to claim 4, characterized in that: Two low-pressure oil return ports are symmetrically arranged between the pilot valve body and the pilot valve sleeve. The pilot valve sleeve and the two ends of the pilot valve core form cavities respectively connected to the two low-pressure oil return ports. The pilot valve sleeve is provided with a through hole connecting the cavity and the low-pressure oil return port.

6. A high-speed reversing valve for amplifying the reversing frequency by rotating a valve according to claim 5, characterized in that: Two high-pressure oil return ports are symmetrically provided between the pilot valve body and the pilot valve sleeve. The first oil hole and the left pilot control chamber, the second oil hole and the right pilot control chamber are respectively connected through the two high-pressure oil return ports. The two high-pressure oil return ports are located between the two low-pressure oil return ports. An O-ring is provided at the contact connection between the pilot valve body and the pilot valve sleeve.

7. The high-speed reversing valve for amplifying the reversing frequency by rotating the valve according to claim 6, characterized in that: There are two low-pressure oil outlets that are interconnected. A third oil circuit is provided on the main valve body between the two low-pressure oil outlets. The two low-pressure oil outlets are arranged on both sides of the main valve body, and the high-pressure oil inlet is arranged in the middle of the main valve body. The first control oil port and the second control oil port are respectively arranged between the two low-pressure oil outlets and the high-pressure oil inlet.

8. The high-speed reversing valve for amplifying the reversing frequency by rotating the valve according to claim 7, characterized in that: The main valve core is provided with a first convex ring, a second convex ring, a third convex ring and a fourth convex ring in sequence along the axial direction to cooperate with the main valve body in sliding sealing. The second convex ring and the third convex ring are respectively provided corresponding to the first control oil port and the second control oil port.

9. The high-speed reversing valve for amplifying the reversing frequency by rotating the valve according to claim 8, characterized in that: The pilot valve body and the main valve body are provided with a fourth oil circuit connecting the right pilot control chamber and the right high-pressure oil return port, and the pilot valve body and the main valve body are provided with a fifth oil circuit connecting the left pilot control chamber and the left high-pressure oil return port; the pilot valve body and the main valve body are respectively provided with a sixth oil circuit and a seventh oil circuit connecting the low-pressure oil outlet and the low-pressure oil return port on the same side.

10. A high-speed reversing valve for amplifying the reversing frequency by rotating a valve according to any one of claims 1 to 9, characterized in that: The driving device is a servo motor, and one end of the pilot valve core extends out of the pilot valve body and is connected to the output shaft of the servo motor.

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