阅读说明：本技术 一种通过转阀放大换向频率的高速换向阀 (High-speed reversing valve capable of amplifying reversing frequency through rotary valve ) 是由 任燕 施锦川 汤何胜 孙维方 向家伟 于 2021-10-15 设计创作，主要内容包括：本发明申请属于流体传动及控制技术领域,具体公开了一种通过转阀放大换向频率的高速换向阀,包括主阀体和先导阀体,先导阀内设有先导阀芯,先导阀体上设有与低压出油口连通的低压回油口；先导阀体内位于先导阀芯外设有先导阀套,先导阀套上开设第一油孔和第二油孔,第一油孔和第二油孔在先导阀套的轴向上错位设置；先导阀芯上设有油槽,油槽与低压回油口连通,先导阀芯连接有驱动其转动的驱动装置,油槽转动与可分别与第一油孔、第二油孔对齐连通。与现有技术相比,本换向阀采用转阀式的先导阀,通过阀体内部油路巧妙的布置,实现了本换向阀较高频率换向,且本换向阀整体结构简单、换向过程稳定可靠,能够应用于高精度电液控制系统中。(The invention belongs to the technical field of fluid transmission and control, and particularly discloses a high-speed reversing valve for amplifying reversing frequency through a rotary valve, which comprises a main valve body and a pilot valve body, wherein a pilot valve core is arranged in the pilot valve, and a low-pressure oil return opening communicated with a low-pressure oil outlet is formed in the pilot valve body; 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 formed in the pilot valve sleeve, and the first oil hole and the second oil hole are arranged in a staggered mode in the axial direction of the pilot valve sleeve; the pilot valve core is provided with an oil groove which is communicated with the low-pressure oil return port, the pilot valve core is connected with a driving device for driving the pilot valve core to rotate, and the oil groove rotates and can be respectively aligned and communicated with the first oil hole and the second oil hole. Compared with the prior art, the reversing valve adopts a rotary valve type pilot valve, the reversing valve is realized at higher frequency through ingenious arrangement of an oil circuit inside the valve body, the whole 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.)

1. A high-speed reversing valve for amplifying reversing frequency through a rotary valve comprises a main valve body and a pilot valve body, wherein a main valve core is arranged 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 formed in the main valve body; a pilot valve core is arranged in the pilot valve, and a low-pressure oil return port communicated with the low-pressure oil outlet is formed in the pilot valve body; the method is characterized in that: 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 formed in the pilot valve sleeve, the first oil hole and the second oil hole are multiple and are respectively arranged along the circumferential direction of the pilot valve sleeve, and the first oil hole and the second oil hole are arranged in a staggered mode 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 cavity, and the right part of the main valve core and the main valve body are provided with a right pilot control cavity; the left guide control cavity and the first oil hole are communicated with the high-pressure oil inlet, and the right guide control cavity and the second oil hole are communicated with the high-pressure oil inlet; the pilot valve core is provided with an oil groove, the oil groove is communicated with the low-pressure oil return opening, the pilot valve core is connected with a driving device for driving the pilot valve core to rotate, and the oil groove rotates and can be respectively communicated with the first oil hole and the second oil hole in an aligned mode.

2. The high-speed reversing valve for amplifying the reversing frequency of the rotary valve according to claim 1, wherein the number of the first oil holes and the number of the second oil holes are respectively 10-30, the diameters of the first oil holes and the number of the second oil holes are the same, all the first oil holes are uniformly spaced, and all the second oil holes are uniformly spaced.

3. The high-speed reversing valve for amplifying the reversing frequency through the rotary valve according to claim 2, wherein the number of the first oil hole and the second oil hole is 20, the number of the oil grooves is two, and the two oil grooves are symmetrically arranged on the pilot spool.

4. The high-speed reversing valve for amplifying the reversing frequency through the rotary valve according to claim 1, wherein a first oil path is arranged on the main valve body, the right pilot control cavity is communicated with a high-pressure oil inlet through the first oil path, and a right restrictor is arranged in the first oil path; the main valve body is provided with a second oil path, the left guide control cavity is communicated with the high-pressure oil inlet through the second oil path, and a left throttling device is arranged in the second oil path.

5. The high-speed reversing valve for amplifying the reversing frequency through the rotary valve as claimed in claim 4, wherein two low-pressure oil return ports are symmetrically arranged between the pilot valve body and the pilot valve sleeve, the pilot valve sleeve and two ends of the pilot valve core form a cavity respectively communicated with the two low-pressure oil return ports, and a through hole for communicating the cavity and the low-pressure oil return ports is arranged on the pilot valve sleeve.

6. The high-speed reversing valve for amplifying the reversing frequency through the rotary valve as claimed in claim 5, wherein two high-pressure oil return ports are symmetrically arranged 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 communicated 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, and an O-ring is arranged at the contact joint of the pilot valve body and the pilot valve sleeve.

7. The high-speed reversing valve for amplifying the reversing frequency through the rotary valve as claimed in claim 6, wherein the two low-pressure oil outlets are communicated with each other, a third oil path is communicated between the two low-pressure oil outlets on the main valve body, the two low-pressure oil outlets are disposed at two sides of the main valve body, the high-pressure oil inlet is disposed at the middle of the main valve body, and the first control oil port and the second control oil port are respectively disposed between the two low-pressure oil outlets and the high-pressure oil inlet.

8. The high-speed reversing valve for amplifying the reversing frequency through the rotary valve as claimed in claim 7, wherein the main valve core is provided with a first convex ring, a second convex ring, a third convex ring and a fourth convex ring which are in sliding sealing fit with the main valve body in sequence along the axial direction, and the second convex ring and the third convex ring are respectively arranged corresponding to the first control oil port and the second control oil port.

9. The high-speed reversing valve for amplifying the reversing frequency through the rotary valve according to claim 8, wherein a fourth oil path communicating the right pilot control chamber and the high-pressure oil return port is formed on the pilot valve body and the main valve body, and a fifth oil path communicating the left pilot control chamber and the high-pressure oil return port is formed on the pilot valve body and the main valve body; and a sixth oil way and a seventh oil way which are communicated with the low-pressure oil outlet and the low-pressure oil return port on the same side are respectively arranged on the pilot valve body and the main valve body.

10. A high speed reversing valve for amplifying reversing frequency by rotating valve according to any one of claims 1 to 9, wherein the driving means is a servo motor, and one end of the pilot valve core extends out of the pilot valve body and is connected with the output shaft of the servo motor.

Technical Field

The invention belongs to the technical field of fluid transmission and control, and particularly discloses a high-speed reversing valve for amplifying reversing frequency through a rotary valve.

Background

The hydraulic change valve in the fluid control valve plays the roles of controlling flow and pressure and switching oil passages. For example, the electromagnetic directional valve can control flow and switch oil circuit. At present, the hydraulic electromagnetic directional valve on the market is divided into with the latus rectum size: 6-path, 10-path, 16-path and above (25, 32, etc.) hydraulic electromagnetic directional valves.

The fluid control valve for small flow is generally in the form of a single-stage direct-acting valve, namely, a 6-path and 10-path hydraulic electromagnetic directional valve is generally a direct-acting valve (a main valve core is directly pushed by electromagnetic force generated by an electromagnet); the fluid control valve used for large flow rate must adopt the form of a two-stage valve to overcome the hydraulic force applied to the valve core when the valve core is opened, and the valve core is pushed by hydraulic pressure, namely, a hydraulic electromagnetic directional valve with the diameter of 16 drift diameters or more (25, 32 and the like) generally adopts the form of a two-stage valve (one valve is superposed on the main stage as a pilot valve so as to drive the power stage valve core by hydraulic pressure).

The conventional fluid control valve for small flow generally comprises a valve body, a valve core and an electromagnetic driving device, wherein the valve body is provided with a high-pressure oil inlet, a low-pressure oil outlet and two control oil ports, the valve core is controlled by the electromagnetic driving device to axially move in the valve body, so that the two control oil ports are respectively communicated with the high-pressure oil inlet and the low-pressure oil outlet, or the two control oil ports are respectively communicated with the low-pressure oil outlet and the high-pressure oil inlet, or the two control oil ports, the high-pressure oil inlet and the low-pressure oil outlet are mutually separated, and the direct-acting valve is used for controlling small flow; when the flow is increased, in order to overcome the hydraulic force generated by the fluid flow on the valve core to block the valve core from moving when the valve core is opened, the electromagnetic thrust needs to be increased.

In the prior art, the volume of an electromagnetic driving device is increased or the input current is increased to improve the electromagnetic thrust, so that the valve core is pushed; for the fluid control valve with medium and large flow, after the valve core is opened, the hydraulic force generated by the high-pressure and large-flow fluid flow on the valve core is very large, and the problem cannot be solved only by increasing the electromagnetic thrust, so that the fluid control valve can be realized by adopting a two-stage valve. The two-stage valve is characterized in that an electromagnetic valve (generally 6-path) is superposed on a main valve body (power stage valve) to serve as a pilot valve, the pressure of a left cavity and a right cavity of the main valve core is controlled by the pilot valve, reversing of the main valve, namely switching of an oil path is achieved, and therefore the problem of opening of a large-flow reversing valve is solved.

The medium and large flow fluid control valve can perform high-frequency reversing, plays an important role in the important engineering fields of actuating mechanism motion control, high-power high-frequency excitation and the like, and is suitable for the application requirements of a high-precision electro-hydraulic control system. However, the structure of the two-stage valve makes the internal structure of the valve body complex and the reliability of the valve body reduced; and because the valve core is driven by the electromagnet to move, the electromagnet coil is easy to generate heat and the thrust is limited, so that the device has certain limitation in high-power application occasions.

Disclosure of Invention

The invention aims to provide a high-speed reversing valve for amplifying reversing frequency through a rotary valve, and aims to solve the problems that the existing medium-flow and large-flow fluid control valve is complex in structure and the reversing frequency cannot reach higher frequency.

In order to achieve the purpose, the basic scheme of the invention is as follows: a high-speed reversing valve for amplifying reversing frequency through a rotary valve comprises a main valve body and a pilot valve body, wherein a main valve core is arranged 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 formed in the main valve body; a pilot valve core is arranged in the pilot valve, and a low-pressure oil return port communicated with the low-pressure oil outlet is formed in the pilot valve body; 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 formed in the pilot valve sleeve, the first oil hole and the second oil hole are multiple and are respectively arranged along the circumferential direction of the pilot valve sleeve, and the first oil hole and the second oil hole are arranged in a staggered mode 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 cavity, and the right part of the main valve core and the main valve body are provided with a right pilot control cavity; the left guide control cavity and the first oil hole are communicated with the high-pressure oil inlet, and the right guide control cavity and the second oil hole are communicated with the high-pressure oil inlet; the pilot valve core is provided with an oil groove, the oil groove is communicated with the low-pressure oil return opening, the pilot valve core is connected with a driving device for driving the pilot valve core to rotate, and the oil groove rotates and can be respectively communicated with the first oil hole and the second oil hole in an aligned mode.

The working principle of the basic scheme is as follows: the basic structures and functions of the main valve body, the main valve core, the high-pressure oil inlet, the first control oil port, the second control oil port and the low-pressure oil outlet are consistent with those of the prior art, and the pilot valve body can realize that the main valve core slides in the valve body by controlling the pressure of hydraulic oil in the left pilot control cavity and the right pilot control cavity. The main valve core is displaced in the main valve body relative to the main valve body, so that the first state that the high-pressure oil inlet is communicated with the first control oil port and the second control oil port is communicated with the low-pressure oil outlet can be realized, the second state that the high-pressure oil inlet, the first control oil port, the second control oil port and the low-pressure oil outlet are mutually separated can also be realized, and the third state that the high-pressure oil inlet is communicated with the second control oil port and the first control oil port is communicated with the low-pressure oil outlet can also be realized. Under above prerequisite, this switching-over valve will be in the second state before using, and high-pressure oil inlet, first control hydraulic fluid port, second control hydraulic fluid port, low pressure oil-out are separated each other promptly.

When the reversing valve is used, 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. Because the left guide control cavity and the first oil hole are communicated with the high-pressure oil inlet, the right guide control cavity and the second oil hole are communicated with the high-pressure oil inlet, the first oil hole and the left guide control cavity, and the second oil hole and the right guide control cavity can be respectively filled with high-pressure hydraulic oil, and simultaneously, the high-pressure state is kept. Because the low-pressure oil outlet is communicated with the low-pressure oil return opening, the oil groove is communicated with the low-pressure oil return opening, and low-pressure hydraulic oil is filled into the low-pressure oil return opening and the oil groove. At this time, the hydraulic oil charged in the direction valve is balanced, so that the direction valve is continuously in the second state.

This switching-over valve accessible drive pilot valve core rotates when using, the pilot valve core rotates the in-process, when first oilhole and oil groove align the intercommunication, high-pressure hydraulic oil in the first oilhole gets into oil groove and low pressure oil return opening release pressure under the pressure effect, the high-pressure hydraulic oil pressure of accuse chamber is led on a left side thereupon released, and the right side is led the accuse intracavity this moment and still is high-pressure hydraulic oil, the pressure differential of accuse intracavity hydraulic oil can drive main valve core left movement is led with the right side to the accuse chamber of leading on a left side, and then first state or third state appear in this switching-over valve.

Along with the rotation of the pilot valve core, the first oil hole is disconnected with the oil groove, and the hydraulic oil of the first oil hole and the left pilot control cavity keeps high pressure. Because first oilhole and second oilhole in the axial of leading valve barrel dislocation set, after first oilhole and oil groove disconnection, the second oilhole will align the intercommunication with the oil groove. At the moment, high-pressure hydraulic oil in the second oil hole enters the oil groove and the low-pressure oil return opening to release pressure, the pressure of the high-pressure hydraulic oil in the right guide control cavity is released, the high-pressure hydraulic oil in the left guide control cavity is at the moment, the pressure difference of the hydraulic oil in the left guide control cavity and the hydraulic oil in the right guide control cavity can drive the main valve core to move rightwards, and then the control valve is in a state opposite to the last step, namely, a third state or a first state (if the control valve in the last step is in the first state, the control valve in the last step is in the third state), so that the switching of an oil way is realized.

Because first oilhole and second oilhole are a plurality of and set up along the circumference of pilot valve cover respectively, the pilot valve core rotates round oil groove and will communicate many times with first oilhole, second oilhole respectively, realizes the switching of many times real new switching-over valve oil circuit state, and then realizes the many times switching-over of this switching-over valve, increases the switching-over frequency of switching-over valve.

The beneficial effect of this basic scheme lies in:

1. the pilot valve adopts the rotary valve formula structure in this scheme, easily rotates with the general current simple power supply direct drive pilot valve core of industry, for example adopts servo motor drive pilot valve core to rotate, need not to set up complicated electromagnet structure, can make this switching-over valve inner structure simple relatively.

2. In the scheme, the existing driving mechanism is adopted to drive the pilot valve core to rotate, so that only hydraulic transmission exists in the valve body, the interference of an electromagnet, namely a related structure, is reduced, the reliability of the reversing valve is greatly increased, and the valve body of the reversing valve is more stable when high-speed reversing is realized.

4. According to the scheme, the plurality of first oil holes and the plurality of second oil holes which are arranged on the pilot valve sleeve in a staggered mode are used for realizing that the pilot valve core rotates for a circle to control the switching of the state of the oil circuit for multiple times, and the reversing frequency of the reversing valve is amplified according to the number of the first oil holes or the second oil holes, so that the reversing frequency of the reversing valve is greatly increased.

4. In the scheme, the pilot valve of a rotary valve type is adopted, the reversing frequency of the reversing valve can be increased by selecting different driving devices, for example, servo motors with different rotating speeds are adopted, and the reversing frequency of the reversing valve is increased; meanwhile, the reversing frequency of the reversing valve is increased again through the first oil holes and the second oil holes, so that the reversing valve can reach higher reversing frequency, and the reversing valve can be applied to a high-precision electro-hydraulic control system.

5. In the scheme, the pilot valve adopts half-bridge drive instead of full-bridge drive for the main valve, so that only two variable throttling ports are required to be designed instead of four throttling edges, and the pilot valve is simpler in part structure and easy to process; meanwhile, in the control process of the pilot valve on the pressure of the left side and the right side of the main valve element, the main valve element is only required to rotate to borrow the port and simultaneously realize the alternate high pressure and low pressure of the left pilot control cavity or the right pilot control cavity, the driving of the main valve element and the reversing of the reversing valve are realized, the structure is simple and ingenious, the manufacture is easy, and the structural matching required in the use process is easier to realize.

Compared with the prior art, the reversing valve adopts a rotary valve type pilot valve, the reversing valve is realized at higher frequency through ingenious arrangement of an oil circuit inside the valve body, the whole 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.

Furthermore, the number of the first oil holes and the number of the second oil holes are respectively 10-30, the diameters of the first oil holes and the second oil holes are the same, the number of the first oil holes and the number of the second oil holes are the same, all the first oil holes are evenly arranged at intervals, and all the second oil holes are evenly arranged at intervals.

The number of the first oil holes and the second oil holes represents the number of times that the reversing valve can reverse when the pilot valve core rotates once, the number of the first oil holes and the number of the second oil holes are set to be 10-30, the reversing valve can meet the requirement of high frequency reversing of the reversing valve to a large extent, and meanwhile the design of the reversing valve is reasonable.

Further, the number of the first oil holes and the number of the second oil holes are respectively 20, the number of the oil grooves is two, and the two oil grooves are symmetrically arranged on the pilot valve core.

The first oil hole and the second oil hole are provided with 20 oil holes, so that the pilot valve core rotates once, the reversing valve can reverse 20 times, the reversing valve achieves high reversing frequency, and the first oil hole and the second oil hole are convenient to design and manufacture. The oil groove can release the oil pressure of the corresponding oil hole when being aligned with the first oil hole or the second oil hole, and the oil groove is designed to be more reasonable.

Further, a first oil way is arranged on the main valve body, the right guide control cavity is communicated with the high-pressure oil inlet through the first oil way, and a right throttle is arranged in the first oil way; the main valve body is provided with a second oil path, the left guide control cavity is communicated with the high-pressure oil inlet through the second oil path, and a left throttling device is arranged in the second oil path.

The design of the first oil path and the second oil path enables the arrangement of the oil paths in the reversing valve to be more reasonable, and the arrangement of the throttle and the right throttle can avoid the influence of the reverse flow of high-pressure hydraulic oil on the use of the reversing valve.

Furthermore, two low-pressure oil return ports are symmetrically arranged between the pilot valve body and the pilot valve sleeve, cavities respectively communicated with the two low-pressure oil return ports are formed in the pilot valve sleeve and two ends of the pilot valve core, and through holes communicated with the cavities and the low-pressure oil return ports are formed in the pilot valve sleeve.

The arrangement of the two low-pressure oil return ports, the cavity and the through hole structure is more beneficial to the switching of the oil way in the reversing valve after the first oil hole or the second oil hole is communicated with the oil groove, so that the pilot valve of the reversing valve has reasonable internal structural layout, is easy to manufacture and has higher stability in the use process.

Furthermore, two high-pressure oil return ports are symmetrically arranged between the pilot valve body and the pilot valve sleeve, the first oil hole, the left pilot control cavity, the second oil hole and the right pilot control cavity are communicated through the two high-pressure oil return ports respectively, the two high-pressure oil return ports are located between the two low-pressure oil return ports, and an O-shaped sealing ring is arranged at the contact joint of the pilot valve body and the pilot valve sleeve.

The design of two high-pressure oil return openings is convenient for the first oil hole to communicate with the left guide control cavity and the high-pressure oil inlet, the second oil hole to communicate with the right guide control cavity and the high-pressure oil inlet, the layout of the high-pressure oil return opening and the low-pressure oil return opening is more reasonable, and the reversing of the reversing valve is convenient to realize. The O-shaped sealing ring ensures that the two high-pressure oil return ports and the two low-pressure oil return ports are mutually sealed and isolated, so that oil leakage is prevented.

Furthermore, the two low-pressure oil outlets are communicated with each other, a third oil path is communicated between the two low-pressure oil outlets on the main valve body, the two low-pressure oil outlets are arranged on two sides of the main valve body, the high-pressure oil inlet is arranged in the middle of the main valve body, and 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.

The design can enable the main valve core, the high-pressure oil inlet, the first control oil port, the second control oil port and the low-pressure oil outlet to be simple in structure, easy to achieve and reasonable in arrangement.

Furthermore, the main valve core is sequentially provided with a first convex ring, a second convex ring, a third convex ring and a fourth convex ring which are matched with the main valve body in a sliding sealing manner along the axial direction, and the second convex ring and the third convex ring are respectively arranged corresponding to the first control oil port and the second control oil port.

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.

Furthermore, a fourth oil path communicated with the right pilot control cavity and the high-pressure oil return port is arranged on the pilot valve body and the main valve body, and a fifth oil path communicated with the left pilot control cavity and the high-pressure oil return port is arranged on the pilot valve body and the main valve body; and a sixth oil way and a seventh oil way which are communicated with the low-pressure oil outlet and the low-pressure oil return port on the same side are respectively arranged on the pilot valve body and the main valve body.

The design of the fourth oil path, the fifth oil path, the sixth oil path and the seventh oil path can ensure that the reversing valve has reasonable internal structure layout, easy manufacture and more stable use process.

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 with an output shaft of the servo motor.

The servo motor is universal in the market, the technology is mature, and the cost is low. The reliability of the servo motor has been verified as an industrial product for a large number of applications.

Drawings

FIG. 1 is a schematic view of a high speed reversing valve of the present invention with the reversing frequency amplified by the reversing valve;

FIG. 2 is a longitudinal cross-sectional view (second state) of a high speed reversing valve of the present invention with the reversing frequency amplified by the reversing valve;

FIG. 3 is a transverse cross-sectional view of the main valve body at A-A in FIG. 2;

FIG. 4 is a transverse cross-sectional view of the pilot valve body at B-B in FIG. 2;

FIG. 5 is a longitudinal cross-sectional view at C-C of FIG. 3;

FIG. 6 is a first state diagram longitudinal cross-sectional view of a high speed reversing valve of the present invention with the reversing frequency amplified by the reversing valve;

FIG. 7 is a third state diagram longitudinal cross-sectional view of a high speed reversing valve of the present invention with the reversing frequency amplified by the reversing valve;

FIG. 8 is a schematic diagram of the pilot valve cartridge;

FIG. 9 is a schematic structural view of a pilot valve body;

FIG. 10 is a schematic of the main spool construction.

Detailed Description

The following is further detailed by way of specific embodiments:

reference numerals in the drawings of the specification include: the hydraulic control valve comprises a main valve body 10, a high-pressure oil inlet 11, a first control oil port 12, a second control oil port 13, a low-pressure oil outlet 14, a third oil path 15, a left pilot control cavity 21, a right pilot control cavity 22, a first oil path 23, a second oil path 24, a left throttle 25, a right throttle 26, a main valve core 30, a first convex ring 31, a second convex ring 32, a third convex ring 33, a fourth convex ring 34, a pilot valve body 40, a high-pressure oil return port 41, a fourth oil path 42, a fifth oil path 43, a low-pressure oil return port 44, a sixth oil path 45, a seventh oil path 46, an O-shaped sealing ring 47, a pilot valve sleeve 50, a through hole 51, a first oil hole 52, a second oil hole 53, a pilot valve core 60, an oil groove 61 and a cavity 62.

It should be noted that all expressions using the first, second, etc. in the embodiment of the present invention are used for distinguishing two entities with the same name and different names or different parameters, and it should be noted that the first, second, etc. are only used for convenience of expression and should not be understood as limitations to the embodiment of the present invention, and the descriptions of the following embodiments are omitted.

The direction and position terms mentioned in the present invention are, for example: up, down, front, back, left, right, inner, outer, top, bottom, side, etc., refer only to the orientation or position of the figures. Accordingly, the use of directional and positional terms is intended to illustrate and understand the present invention and is not intended to limit the scope of the present invention.

Example 1

As shown in fig. 1, a high-speed direction valve for amplifying a direction change frequency by turning the valve includes a main valve body 10 and a pilot valve body 40, and the pilot valve body 40 is located above the main valve body 10. The main valve body 10 is provided with a main valve core 30 in a sliding manner, a pilot valve sleeve 50 is arranged in the pilot valve, a pilot valve core 60 is rotatably arranged in the pilot valve sleeve 50, the end part of the pilot valve core 60 extends out of the pilot valve body 40, and a driving device (not shown in the figure) for driving the pilot valve core 60 to rotate is arranged outside the pilot valve body 40. The pilot valve core 60 is driven by the driving device to rotate, so that the pressure on two sides of the main valve core 30 can be controlled, the main valve core 30 is driven to slide in the main valve body 10, and the reversing of the reversing valve is realized.

As shown in fig. 2 and 3, 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, wherein the two low-pressure oil outlets 14 are communicated with each other, the main valve body 10 is provided with a third oil path 15, and the third oil path 15 is used for communicating the two low-pressure oil outlets 14. The two low-pressure oil outlets 14 are symmetrically arranged on two sides of the main valve body 10, the high-pressure oil inlet 11 is arranged in the middle of the main valve body 10, the first control oil port 12 is located between the left low-pressure oil outlet 14 and the high-pressure oil inlet 11, and the second control oil port 13 is located between the high-pressure oil inlet 11 and the right low-pressure oil outlet 14.

As shown in fig. 10, the main valve element 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 a sliding and sealing fit with the main valve body 10 in sequence along the axial direction, when the main valve element 30 is located at the central position of the main valve body 10, the second convex ring 32 corresponds to the first control oil port 12 and can seal the first control oil port 12, the third convex ring 33 corresponds to the second control oil port 13 and can seal the second control oil 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.

The left side of the main valve element 30, the left side of the first convex ring 31 and the main valve body 10 enclose a left pilot control chamber 21, the right side of the main valve element 30, the right side of the fourth convex ring 34 and the main valve body 10 enclose a right pilot control chamber 22, and the main valve element 30 can slide between the left pilot control chamber 21 and the right pilot control chamber 22 in the main valve body 10. A first oil path 23 is arranged on the main valve body 10, the right pilot control cavity 22 is communicated with the high-pressure oil inlet 11 through the first oil path 23, and a right throttle 26 is arranged in the first oil path 23; a second oil path 24 is arranged on the main valve body 10, the left pilot control cavity 21 is communicated with the high-pressure oil inlet 11 through the second oil path 24, and a left throttling device 25 is arranged in the second oil path 24.

As shown in fig. 4, 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, the two high-pressure oil return ports 41 are symmetrically arranged along the center of the pilot valve body 40, and the two high-pressure oil return ports 41 are located between the two low-pressure oil return ports 44. In order to ensure mutual oil communication 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 joint of the pilot valve body 40 and the pilot valve sleeve 50.

As shown in fig. 5, a sixth oil passage 45 for communicating the right low-pressure oil return port 44 with the right low-pressure oil outlet 14 is provided on the right side of the pilot valve body 40 and the main valve body 10, and a seventh oil passage 46 for communicating the left low-pressure oil return port 44 with the left low-pressure oil outlet 14 is provided on the left side of the pilot valve body 40 and the main valve body 10. The pilot valve core 60 is in sealing fit with the pilot valve sleeve 50 in the middle, cavities 62 are formed at two ends of the pilot valve core 60, and the pilot valve sleeve 50 is provided with a through hole 51 which communicates the cavities 62 of the cavities 62 with the low-pressure oil return port 44. Namely, the left low-pressure oil outlet 14, the seventh oil path 46, the left low-pressure oil return port 44, the through hole 51 and the left cavity 62 are communicated, the right low-pressure oil outlet 14, the sixth oil path 45, the right low-pressure oil return port 44, the through hole 51 and the right cavity 62 are communicated, and the left low-pressure oil outlet 14 and the right low-pressure oil outlet 14 are communicated through the third oil path 15.

In the present embodiment, in order to ensure the high-speed reversing frequency of the reversing valve, it is preferable that 10 to 30 first oil holes 52 and second oil holes 53 are provided respectively in the pilot valve housing 50, and the pilot valve housing 50 is provided with a plurality of first oil holes 52 corresponding to one turn of the left high-pressure oil return port 41 and a plurality of second oil holes 53 corresponding to one turn of the right high-pressure oil return port 41. The first oil hole 52 and the second oil hole 53 have the same diameter and number and are respectively arranged along the circumferential uniform part of the pilot valve sleeve 50, and the first oil hole 52 and the second oil hole 53 are arranged in a staggered manner in the axial direction of the pilot valve sleeve 50.

The pilot spool 60 is provided with an oil groove 61, the oil groove 61 is communicated with the low-pressure oil return port 44 through the cavity 62 and the through hole 51, and the oil groove 61 rotates and can be sequentially communicated with the first oil hole 52 and the second oil hole 53 in an aligned manner. The pilot valve body 40 and the main valve body 10 are provided with a fourth oil passage 42 communicating the right pilot chamber 22 and the high-pressure oil return port 41, and the pilot valve body 40 and the main valve body 10 are provided with a fifth oil passage 43 communicating the left pilot chamber 21 and the high-pressure oil return port 41. The pilot valve core 60 rotates to realize the communication of the oil groove 61, the first through hole 51, the left high-pressure oil return port 41, the fifth oil path 43 and the left pilot control cavity 21, or the communication of the oil groove 61, the second through hole 51, the right high-pressure oil return port 41, the fourth oil path 42 and the right pilot control cavity 22.

The specific implementation process is as follows: when the reversing valve is used, high-pressure hydraulic oil needs to be filled into the high-pressure oil inlet 11, and low-pressure hydraulic oil needs to be filled into the low-pressure oil outlet 14. At the moment, high-pressure hydraulic oil is filled in a second oil path 24, a left throttle 25, a left pilot control cavity 21, a fifth oil path 43, a left high-pressure oil return port 41 and a first oil hole 52 which are sequentially communicated with a high-pressure oil inlet 11 on the left side of the reversing valve, and low-pressure hydraulic oil is filled in a seventh oil path 46, a left low-pressure oil return port 44, a left through hole 51 and a left cavity 62 which are sequentially communicated with a left low-pressure oil outlet 14; high-pressure hydraulic oil is filled in a first oil path 23, a right throttle 26, a right guide control cavity 22, a fourth oil path 42, a right high-pressure oil return port 41 and a second oil hole 53 which are sequentially communicated with a high-pressure oil inlet 11 on the right side of the reversing valve, and low-pressure hydraulic oil is filled in a sixth oil path 45, a right low-pressure oil return port 44, a right through hole 51 and a right cavity 62 which are sequentially communicated with a right low-pressure oil outlet 14. When the pilot spool 60 is not rotated and neither the first oil hole 52 nor the second oil hole 53 is aligned with the oil groove 61, the hydraulic oil pressure charged in the direction valve is balanced, and thus the direction valve is in a 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 separated from each other.

When the reversing valve is used, the pilot valve core 60 can be driven to rotate by the driving device, and the first oil hole 52 and the second oil hole 53 are sequentially spaced to be aligned with the oil groove 61 during the rotation of the pilot valve core 60. When the first oil hole 52 and the oil groove 61 are communicated in alignment, 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 pressure under the pressure of the high-pressure hydraulic oil in the first oil hole 52; the pressure of the high-pressure hydraulic oil in the left pilot control chamber 21 is released, and at this time, the pressure difference between the hydraulic oil in the left pilot control chamber 21 and the hydraulic oil in the right pilot control chamber 22 still drives the main valve element 30 to move leftwards, so that the first state that the high-pressure oil inlet 11 is communicated with the first control oil port 12 and the second control oil port 13 is communicated with the right low-pressure oil outlet 14 occurs in the reversing valve.

With the rotation of the pilot spool 60, the first oil hole 52 will be disconnected from the oil groove 61, and the second oil hole 53 will be communicated in alignment with the oil groove 61. At this time, as shown in fig. 7, under 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 pressure of the high-pressure hydraulic oil in the right pilot control chamber 22 is released, and at this time, the high-pressure hydraulic oil still exists in the left pilot control chamber 21, and the pressure difference between the hydraulic oil in the left pilot control chamber 21 and the hydraulic oil in the right pilot control chamber 22 can drive the main valve element 30 to move rightwards, so that the third state that the high-pressure oil inlet 11 is communicated with the second control oil port 13, and the first control oil port 12 is communicated with the left low-pressure oil outlet 14 occurs in the reversing valve.

In the embodiment, the number of the first oil holes 52 and the number of the second oil holes 53 are respectively 10-30, and the diameters and the numbers of the first oil holes 52 and the second oil holes 53 are the same and are respectively arranged along the circumferential uniform part of the pilot valve sleeve 50; the oil groove 61 of the pilot valve core 60 rotates one circle to be respectively communicated with the first oil hole 52 and the second oil hole 53 for 10-30 times (the times are consistent with the number of the first oil hole 52 and the second oil hole 53), so that the change-over valve realizes 10-30 times of oil path state switching, and further realizes high-speed increase of change-over frequency of the change-over valve. The reversing valve can also select driving devices with different rotating speeds, and the reversing frequency of the reversing valve is increased.

The reversing frequency of the reversing valve is amplified twice through the rotating speed of the external driving device and the number of the first oil holes 52 and the second oil holes 53, so that the reversing valve can reach the higher-speed reversing frequency, and further, the reversing valve can be applied to a high-precision electro-hydraulic control system. Meanwhile, although the reversing valve is a two-stage valve, a driving structure is not designed in the valve body, the driving device is installed outside the valve body and driven by a half-bridge mode, so that oil ways, oil ports and the like in the valve body are simpler to arrange, a better sealing state can be achieved, and the reversing valve can support the application of high-speed reversing frequency.

Example 2

The present embodiment is different from embodiment 1 in that, as shown in fig. 8, it is preferable that two oil grooves 61 are provided, and the two oil grooves 61 are symmetrically provided on the pilot spool 60. As shown in fig. 9, in the present embodiment, 20 first oil holes 52 and 20 second oil holes 53 are provided, respectively.

The first oil hole 52 and the second oil hole 53 are provided with 20 oil holes, so that the pilot valve core 60 rotates once, the reversing valve can reverse 20 times, the reversing valve can reach high proper reversing frequency, and the design and the manufacture of the first oil hole 52 and the second oil hole 53 are facilitated. It is more reasonable to design the oil groove 61 as two, which can release the oil pressure of the corresponding oil hole when it is aligned with the first oil hole 52 or the second oil hole 53.

Example 3

The difference between this embodiment and embodiment 1 is that in this embodiment, the driving device preferably adopts a servo motor, the servo motor is disposed on the left side or the 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 of the end of the pilot valve body 40.

In the embodiment, the driving device is a servo motor, the servo motor is used as an industrial product for a large number of applications, the reliability of the servo motor is verified, and the structure of the servo motor is simpler compared with other driving devices. The rotating speed of the servo motor is selected more, the servo motor with the corresponding rotating speed can be selected according to the requirement, and the different high-speed reversing of the reversing valve is realized.

The foregoing is merely an example of the present invention and common general knowledge in the art of designing and/or characterizing particular aspects and/or features is not described in any greater detail herein. It should be noted that, for those skilled in the art, without departing from the technical solution of the present invention, several variations and modifications can be made, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicability of the patent. The scope of the claims of the present application shall be determined by the contents of the claims, and the description of the embodiments and the like in the specification shall be used to explain the contents of the claims.