CN110848198A

CN110848198A - Zero-oil-leakage energy conversion valve of double hydraulic system

Info

Publication number: CN110848198A
Application number: CN201911276531.2A
Authority: CN
Inventors: 苟辽; 杨宁都; 王力; 颜若飞
Original assignee: SICHUAN LINGFENG AERO HYDRAULIC MACHINERY Co Ltd
Current assignee: SICHUAN LINGFENG AERO HYDRAULIC MACHINERY Co Ltd
Priority date: 2019-12-12
Filing date: 2019-12-12
Publication date: 2020-02-28

Abstract

The invention discloses a zero-oil-string energy conversion valve for double hydraulic systems, and aims to provide a conversion valve which can realize the switching of on and off of two normal/emergency standby hydraulic systems to convert zero-oil-string and is reliable in mutual switching. The invention is realized by the following technical scheme: the valve body of the valve is provided with an unloading hole communicated with the stepped hole of the valve cavity and an oil return one-way valve cavity communicated with the oil return pressure port channel in the same direction; the second oil inlet connecting channel and the first oil inlet connecting channel are oppositely and symmetrically communicated with the second oil inlet one-way valve cavity to form an oil inlet loop communicated with the oil inlet pressure inlet channel, and the two oppositely-butted oil return one-way valves tightly attach the valve cores by means of the pressure of a hydraulic system and the spring force of a valve spring; under the pressure action of a hydraulic system, the normal pressure supply oil way and the emergency pressure supply oil way are mutually separated from entering and flowing out through the sealing ring arranged on the stepped sliding valve, and the normal/emergency pressure supply oil is mutually switched respectively so as to control the on-off working states of the main hydraulic oil tank and the power-assisted hydraulic oil tank.

Description

Zero-oil-leakage energy conversion valve of double hydraulic system

Technical Field

The invention relates to a zero oil leakage energy conversion valve of a double hydraulic system, in particular to a valve for switching between a normal pressure supply oil way and an emergency pressure supply oil way of a connecting airplane, and zero oil leakage between the two oil ways is ensured during switching.

Background

In aircraft, there are usually more than three sets of hydraulic systems, and it is generally impossible to damage three sets simultaneously. If all damage occurs, the aircraft will immediately seek the nearest location for landing maintenance. If the hydraulic system fails completely, the mechanism which can generate action of the airplane is not moved, and the flying state cannot be changed. The hydraulic system functions to increase the force by changing the pressure. A complete hydraulic system consists of five parts, namely a power element, an actuator, a control element, an auxiliary element (attachment) and hydraulic oil. Hydraulic systems can be divided into two categories: hydraulic transmission systems and hydraulic control systems. Hydraulic drive systems have as a primary function the transmission of power and motion. Hydraulic control systems are designed to provide a hydraulic system output that meets specific performance requirements (particularly dynamic performance), and are generally referred to as hydraulic drive systems. Modern aircraft are mostly provided with two or more sets of mutually independent hydraulic systems. The common hydraulic system is used for retraction and extension of the landing gear, the flap and the speed reducing plate, steering operation of the front wheel, driving of a hydraulic motor of a windshield wiper and a fuel pump, and driving of a part of the ailerons, the elevator and the booster of the rudder. The power-assisted hydraulic system is used for driving a booster, a damping steering engine and the like of the flight control system. In order to improve the reliability, an emergency electric oil pump and a pneumatic pump are often connected in parallel in a hydraulic system. The airplane hydraulic system consists of a left subsystem and a right subsystem which are independent; the subsystems are connected through an oil return conversion valve (hereinafter referred to as valve). The valve is located within the landing gear retraction system and the landing gear switches the pressure that the valve will supply to the landing gear. The position undercarriage conversion valve is positioned at the front end of a main undercarriage wheel cabin web beam. Generally, the switching valve is a two-position, hydraulic or electromagnetic operated valve, and is used for ensuring that when the right system is used for normally retracting the landing gear, oil returns to the right system oil tank, and when the left system is used for emergently retracting the landing gear, oil returns to the left system oil tank; so that the oil storage amount in the left oil tank and the right oil tank is kept balanced, and oil cross is not allowed. When the changeover flaps in the landing gear retraction system of an aircraft are in a standby state, the hydraulic system is usually pressure-fed to the landing gear retraction system. The boosting hydraulic energy system supplies oil and maintains pressure for the emergency hydraulic system through the emergency accumulator, and controls the switching between the oil circuits of the main hydraulic oil tank and the boosting hydraulic oil tank through the conversion valve or the manual pressure release valve. The emergency hydraulic system of the airplane is independent of other hydraulic systems, and provides emergency hydraulic pressure and pneumatic pressure for the flight control system of the airplane when other hydraulic systems are in failure. In order to improve the safety of a hydraulic system and avoid the related failure of the hydraulic system when an airplane flies in the air, the requirement of mutually isolating a main hydraulic oil tank and a power-assisted hydraulic oil tank is provided. However, oil mass imbalance between the main hydraulic oil tank and the power-assisted hydraulic oil tank may be caused by oil mixing channels existing in the two hydraulic systems of the main hydraulic oil tank and the power-assisted hydraulic oil tank of the aircraft. Therefore, certain measures are needed to be taken to ensure that the main hydraulic oil tank and the auxiliary hydraulic oil tank are mutually isolated in the normal working process of the system, the two oil tanks are communicated if necessary to balance the oil t of the two oil tanks, an oil liquid communication pipeline needs to be manually communicated according to the working requirement of the system and the actual condition of an airplane, and the oil liquid in the hydraulic oil tank is not allowed to leak through a manual switching valve. The manual switching valve comprises a handle, a shaft, an outer barrel, a sealing ring and the like, the manual switching valve has two working states of disconnection and connection, and under a normal working state, the valve is in a disconnection state, and the movable stop block blocks the fixed stop block, so that the main hydraulic oil tank and the power-assisted hydraulic oil tank are isolated from each other. The through hole of the movable stop block is communicated with the through hole of the fixed stop block, the valve is in a communicated state, and the main hydraulic oil tank is communicated with the power-assisted hydraulic oil tank, so that the oil quantity of the two hydraulic oil tanks is balanced, but the hydraulic oil tanks are just above an afterburning chamber of an engine and are not easy to check, and once hydraulic oil leaks, danger is possibly caused. Therefore, the hydraulic oil is not allowed to leak to the outside of the oil tank. Therefore, ensuring the sealing performance of the rotating shaft in the manual switching valve becomes a key problem in design.

Disclosure of Invention

Aiming at the defects of the existing airplane double-hydraulic system conversion valve, the invention aims to provide the double-hydraulic system zero-string oil energy conversion valve which can realize the on-off conversion of two hydraulic systems and zero-string oil, has flexible conversion and reliable oil supply, can prevent oil leakage between the two systems when a normal energy system is switched to a standby energy system, and ensures the mutual switching reliability of a normal pressure supply oil path and an emergency pressure supply oil path, and particularly is used for the conversion of the airplane double-hydraulic system.

The technical scheme adopted by the invention for solving the technical problems is as follows: a zero-oil-string energy conversion valve for a dual hydraulic system, comprising: the valve body 26 of the double-hydraulic system communicating the normal pressure supply oil path and the emergency pressure supply oil path is assembled on the shaft shoulder of the valve body 26 in the cavity of the limited height, and the stepped slide valve 1 moves along the axis direction or moves along the trend, and the annular grooves a, b, c, d and the sealing annular grooves which are arranged according to the natural sequence are respectively arranged on each section of the shaft body of the stepped slide valve 1, and the double-hydraulic system is characterized in that: the valve body 26 of the valve is provided with an unloading hole 23 communicated with a stepped hole of the valve cavity, the valve cavity upper bodies of the head and the tail stepped holes are oppositely symmetrical, radially and correspondingly, the annular grooves a, b, c and d are bent upwards in parallel along the potential direction, and are respectively communicated with a second oil inlet channel 19 and a first oil return channel 25 of the head and the tail stepped holes of the valve cavity, a second oil inlet connecting channel 17, a second oil return connecting channel 18, a first oil return connecting channel 4 and a first oil inlet connecting channel 5, and the second oil inlet connecting channel 17, the second oil return connecting channel 18, the first oil return connecting channel 4 and the first oil inlet connecting channel 5 are respectively communicated with two oil return one-way valve cavities which are oppositely symmetrical at the lower part and are communicated with an oil return pressure R port channel in; the second oil inlet connecting passage 17 and the first oil inlet connecting passage 5 are oppositely and symmetrically communicated with a second oil inlet check valve cavity to form an oil inlet loop communicated with the oil inlet pressure P port passage, the two oppositely-opposite first oil return check valves 7 and the two oppositely-opposite second oil return check valves 16 tightly attach the valve cores by means of the pressure of a hydraulic system and the spring forces of the first valve spring 6 and the second valve spring 15, and the oil return pressure R port passage is closed in a full-sealing manner; the first and second oil

inlet check valves

10, 12 are tightly attached to the valve body by means of the spring force of the opposite end opposite-propping spring 11, the oil inlet pressure P port channel is closed in a full-sealing manner, the normal pressure supply oil path and the emergency pressure supply oil path are mutually separated from entering and flowing out through the sealing ring arranged on the step slide valve under the pressure action of the hydraulic system, and the mutual switching of the normal pressure supply oil path and the emergency pressure supply oil path of the hydraulic oil path of the oil inlet pressure P port and the oil return pressure R port is respectively realized, so that the on-off working states of the main hydraulic oil tank and the auxiliary hydraulic oil tank are controlled.

Compared with the prior art, the invention has the following beneficial effects:

the conversion is flexible. The invention adopts the valve body 26 which is communicated with the normal pressure supply oil path and the emergency pressure supply oil path, and the double hydraulic systems can respectively and independently work through the zero-string oil energy conversion valve of the double hydraulic systems, and can simultaneously and reliably switch to the emergency hydraulic system to work when the pressure of the normal hydraulic system is reduced. The step slide valve 1 assembled in the valve body 26 and the oil inlet one-way valve and the oil return one-way valve 10 which are symmetrically arranged in opposite directions and communicated with each other are utilized to realize the mutual switching of the normal pressure supply oil path and the emergency pressure supply oil path, the zero oil leakage of the normal pressure supply oil path and the emergency pressure supply oil path is realized in principle, and the problem of the oil leakage in the mutual switching process of the normal pressure supply oil path and the emergency pressure supply oil path is solved.

The oil supply is reliable. The middle section of the stepped slide valve 1 realizes zero oil leakage by arranging the

sealing rings

22 and 24; the valve cores of the first and second oil return one-

way valve parts

7 and 16 are tightly attached to the valve body 26 of the valve by means of system pressure and the spring force of the first valve spring 6 and the second valve spring 15, so that complete sealing is realized; the first and second oil

inlet check valves

10 and 12 are tightly attached to the valve body 26 of the valve by the spring force of the opposite spring 11, so that complete sealing is realized. The oil inlet one-way valve and the oil return one-way valve are arranged before pressure oil enters the execution element and after the pressure oil flows out of the execution element respectively, when a normal pressure supply oil way of the airplane is damaged, the switching valve can be flexibly, freely and reliably switched to an emergency pressure supply oil way automatically from the normal pressure supply oil way, and zero oil leakage of the normal pressure supply oil way and the emergency pressure supply oil way can be guaranteed before and after switching. When the pressure of the normal hydraulic system is reduced, the emergency hydraulic system can work by switching.

The invention adopts the step slide valve to realize the mutual switching of the normal pressure supply oil path and the emergency pressure supply oil path, and realizes the mutual separation of the normal pressure supply oil path and the emergency pressure supply oil path by arranging the sealing element ring on the step slide valve; in order to prevent pressure oil entering and flowing out of the execution element from entering the other pressure supply oil way, an oil inlet one-way valve and an oil return one-way valve are respectively arranged before the pressure oil enters the execution element and after the pressure oil flows out of the execution element, and zero oil mixing of a normal pressure supply oil way and an emergency pressure supply oil way is realized in principle. Under the pressure effect of a hydraulic system, the normal pressure supply oil circuit and the emergency pressure supply oil circuit are mutually separated from entering and flowing out through the sealing ring arranged on the stepped sliding valve, the mutual switching of zero oil string energy of the normal pressure supply oil circuit and the emergency pressure supply oil circuit of the hydraulic oil circuit of the oil inlet pressure P port and the oil return pressure R port is respectively realized, the two working states of the main hydraulic oil tank and the power-assisted hydraulic oil tank are controlled, the oil string leakage between the two systems can be prevented when the normal energy system is switched to the standby energy system, and the reliable energy conversion of the mutual switching of the normal pressure supply oil circuit and the emergency pressure supply oil circuit is ensured. The normal pressure supply oil way and the emergency pressure supply oil way can be separated from each other by arranging the sealing ring on the stepped slide valve; in order to prevent the pressure entering and flowing out of the actuating element from entering the other pressure supply oil way, the valve body 26 is provided with the unloading hole 23, so that high-pressure trapped oil between the sealing rings is prevented from being formed, the sealing performance is prevented from being reduced, and the mutual switching of zero oil leakage energy of the normal pressure supply oil way and the emergency pressure supply oil way is realized.

The invention is particularly suitable for zero-cross oil energy conversion with double hydraulic systems, in particular to a valve with double-hydraulic-system conversion on an aircraft, automobile and ship operation carrier, and particularly is a zero-cross oil energy conversion valve for airplane double-hydraulic-system conversion.

Drawings

FIG. 1 is a schematic diagram of the normal pressure supply oil path control of the zero oil-crossing energy conversion valve of the dual hydraulic system of the present invention.

Fig. 2 is a schematic diagram of the control of the emergency pressure supply oil path of the zero oil-crossing energy conversion valve of the dual-hydraulic system.

In the figure: the valve comprises a step slide valve 1, a first oil inlet channel 2, an elongated hole 3, a first oil return connecting channel 4, a first oil inlet connecting channel 5, a first valve spring 6, a first oil return check valve 7, a first valve communicating hole 8, a double-row oil return channel 9, a first oil inlet check valve 10, an opposite-top spring 11, a second oil inlet check valve 12, a double-row oil inlet channel 13, a second valve communicating hole 14, a second valve spring 15, a second oil return check valve 16, a second oil inlet connecting channel 17, a second oil return connecting channel 18, a second oil inlet channel 19, a second oil return channel 20, a radial zigzag through hole 21, a left cavity sealing ring 22, an unloading hole 23, a right cavity sealing ring 24, a first oil return channel 25 and a valve body 26.

The invention is further illustrated with reference to the following figures and examples, without thereby limiting the scope of the invention to the described examples. All such concepts are intended to be within the scope of the present disclosure and the present invention.

Detailed Description

See fig. 1-2. In a preferred embodiment described below, a dual hydraulic system zero cross-oil energy conversion valve comprises: the valve body 26 of the double-hydraulic system communicating the normal pressure supply oil path and the emergency pressure supply oil path is assembled on the shaft shoulder of the valve body 26 in the cavity of the limited height, and the stepped slide valve 1 moves along the axis direction or moves along the trend, and the annular grooves a, b, c, d and the sealing annular grooves which are arranged according to the natural sequence are respectively arranged on each section of the shaft body of the stepped slide valve 1, and the double-hydraulic system is characterized in that: the valve body 26 of the valve is provided with an unloading hole 23 communicated with a stepped hole of the valve cavity, the valve cavity upper bodies of the head and the tail stepped holes are oppositely symmetrical, radially and correspondingly, the annular grooves a, b, c and d are bent upwards in parallel along the potential direction, and are respectively communicated with a second oil inlet channel 19 and a first oil return channel 25 of the head and the tail stepped holes of the valve cavity, a second oil inlet connecting channel 17, a second oil return connecting channel 18, a first oil return connecting channel 4 and a first oil inlet connecting channel 5, and the second oil inlet connecting channel 17, the second oil return connecting channel 18, the first oil return connecting channel 4 and the first oil inlet connecting channel 5 are respectively communicated with two oil return one-way valve cavities which are oppositely symmetrical at the lower part and are communicated with an oil return pressure R port channel in; the second oil inlet connecting passage 17 and the first oil inlet connecting passage 5 are oppositely and symmetrically communicated with a second oil inlet check valve cavity to form an oil inlet loop communicated with the oil inlet pressure P port passage, the two oppositely-opposite first oil return check valves 7 and the two oppositely-opposite second oil return check valves 16 tightly attach the valve cores by means of the pressure of a hydraulic system and the spring forces of the first valve spring 6 and the second valve spring 15, and the oil return pressure R port passage is closed in a full-sealing manner; the first and second oil

inlet check valves

When the two hydraulic systems respectively and independently work, leakage sources of three parts exist in the zero oil string energy conversion valve of the two hydraulic systems, namely the middle section of the stepped sliding valve 1, the first oil return one-way valve part 7, the second oil return one-way valve part 16, the first oil inlet one-way valve part 10 and the second oil inlet one-way valve part 12. The middle section of the stepped slide valve 1 is provided with a left cavity sealing ring 22 and a right cavity sealing ring 24 to realize zero oil leakage; the valve cores of the first oil return one-way valve 7 and the second oil return one-way valve 16 are tightly attached to the inner cavity wall of the valve body 26 by the aid of system pressure and spring forces of the first valve spring 6 and the second valve spring 15 of the first oil return one-way valve part 7 and the second oil return one-way valve part 16, and complete sealing is achieved; the first and second oil

inlet check valves

10 and 12 are tightly attached to the inner cavity wall of the valve body 26 of the valve by the spring force of the opposite spring 11, so that complete sealing is realized. In order to further ensure zero oil leakage in the middle section of the stepped slide valve 1, the valve body 26 is provided with the unloading hole 23, so that high-pressure oil trapping between sealing rings of the left cavity sealing element 22 and the right cavity sealing element 24 is prevented, and the sealing performance is prevented from being reduced. And the mutual switching of the zero oil crossing energy of the normal pressure supply oil way and the emergency pressure supply oil way is realized.

In fig. 1, when the rated pressures or pressures of the hydraulic systems are all equal, the radial size of the step shaft at the tail of the right section of the stepped slide valve 1 is greater than that of the step shaft at the head of the left section of the stepped slide valve 1 by the oil inlet pressure P1 and the oil inlet pressure P2, so that the axial force of the stepped slide valve 1 bearing the oil inlet pressure P2 at the right side is less than that of the stepped slide valve 1 bearing the oil inlet pressure P1 at the left side, at this time, the normal pressure supply circuit works, and the emergency pressure supply circuit does not work. At the moment, pressure oil with the oil inlet pressure P1 enters a first oil inlet channel 2 of a cavity stepped hole cavity of a valve body 26 of the communicating valve and acts on the right end face of a stepped slide valve 1, the stepped slide valve 1 moves to a left limit position under the action of hydraulic pressure, at the moment, pressure oil with the oil inlet pressure P1 channel enters an annular groove a on the stepped slide valve 1 through a bypass hydraulic channel and is communicated with a first oil inlet connecting channel 5 through a back end cavity of the stepped slide valve 1, the pressure oil with the oil inlet pressure P1 flows in two ways through the first oil inlet connecting channel 5, one way enters a first oil return one-way valve 7, the one-way valve body is driven to overcome the spring force of a first spring 6, the one-way valve body is pushed to the right limit; the other path of pressure oil is sent into the first oil inlet one-way valve 10 through the oil inlet loop, the valve core is driven to compress the opposite-top spring 11 to move leftwards under the action of the pressure oil, the valve is opened, the oil inlet channel 13 is communicated, the oil inlet channel of the actuating cylinder (actuating element) is communicated, the oil inlet pressure P is output, and meanwhile, the second oil inlet one-way valve 12 is tightly attached to the outlet valve to block the second oil inlet connecting channel 17 under the action of the opposite-top spring force 11 and form sealing. The pressure oil generated by the oil inlet pressure P is communicated with an oil inlet pressure P port channel of the connected executive element, and the pressure oil enters one cavity of the executive element and flows out from the oil liquid in the other cavity of the executive element.

In fig. 2, when the pressure of the normal pressure supply line is reduced, the right axial force borne by the step slide valve 1 is greater than the left axial force borne by the step slide valve 1, at this time, the step slide valve 1 switches the working position to the working state of the emergency pressure supply line, the normal pressure supply line does not work, at this time, the emergency hydraulic system pressure oil P2 enters the step hole valve cavity through the second oil inlet passage 19, acts on the left end surface of the step slide valve 1, under the action of hydraulic pressure, the step slide valve 1 is pushed to move to the right limit position, the pressure oil P2 enters the displacement valve cavity of the step slide valve 1 through the circulating passage connected with the second oil inlet passage 19 through the second oil inlet passage 19, communicates with the second oil inlet connecting passage 17 through the c-ring groove on the first step shaft, and separately flows through the intersecting communicating passage, under the action of the pressure oil P2, one way enters the second oil return check valve, pushing the one-way valve body to move to the left limit position to form an opening, and supplying return oil to a return oil pressure R2 port channel through a d-ring groove communicated with the second return oil connecting channel 18; the other path of pressure oil P2 enters the valve cavity of the second oil inlet check valve 12 through the second oil inlet connecting passage 17, the check valve 1 core moves rightwards under the action of the pressure oil to open the valve and communicate with the oil inlet pressure P port passage of the actuating element, meanwhile, the pressure oil P2 acts on the first oil inlet check valve 10 to compress the butting spring force 11 and push the check valve body to tightly fit the valve and form sealing, so that the pressure oil P2 is communicated with the actuating element through the oil inlet pressure P port passage, enters one of the cavities from the actuating element and flows out from the other cavity of the actuating element to communicate with the oil return pressure R port passage connected with the actuating element, and the oil return enters the oil return passage 9 through the oil return pressure R port.

Under the action of the pressure of the normal pressure supply oil way and the spring force of the first spring 6, the valve core of the first oil return one-way valve 7 is tightly attached to the valve port to form sealing, the return oil entering the oil return channel 9 enters the second oil return connecting channel 17 through an opening formed by the second oil return one-way valve 16, and is communicated with the oil return pressure R port 2 of the emergency pressure supply oil way through the annular groove d at the left section of the stepped sliding valve 1. And forming a loop for working the emergency hydraulic system.

When the rated pressure or the pressure supplied by the hydraulic system is equal, the radial size of the tail step shaft at the right section of the stepped slide valve 1 is larger than that of the head step shaft at the left section of the stepped slide valve 1 by the oil inlet pressure P1 and the oil inlet pressure P2, so that the axial force of the stepped slide valve 1 bearing the oil inlet pressure P2 at the right side is smaller than that of the stepped slide valve 1 bearing the oil inlet pressure P1 at the left side, the normal pressure supply oil way works at the moment, and the emergency pressure supply oil way does not work. At the moment, pressure oil with the oil inlet pressure P1 enters a first oil inlet channel 2 of a cavity stepped hole cavity of a valve body 26 of the communicating valve and acts on the right end face of a stepped slide valve 1, the stepped slide valve 1 moves to a left limit position under the action of hydraulic pressure, at the moment, pressure oil with the oil inlet pressure P1 channel enters an annular groove a on the stepped slide valve 1 through a bypass hydraulic channel and is communicated with a first oil inlet connecting channel 5 through a back end cavity of the stepped slide valve 1, the pressure oil with the oil inlet pressure P1 flows in two ways through the first oil inlet connecting channel 5, one way enters a first oil return one-way valve 7, the one-way valve body is driven to overcome the spring force of a first spring 6, the one-way valve body is pushed to the right limit; the other path of pressure oil is sent into the first oil inlet one-way valve 10 through the oil inlet loop, the valve core is driven to compress the opposite-top spring 11 to move leftwards under the action of the pressure oil, the valve is opened, the oil inlet channel 13 is communicated, the oil inlet channel of the actuating cylinder (actuating element) is communicated, the oil inlet pressure P is output, and meanwhile, the second oil inlet one-way valve 12 is tightly attached to the outlet valve to block the second oil inlet connecting channel 17 under the action of the opposite-top spring force 11 and form sealing. The pressure oil generated by the oil inlet pressure P is communicated with an oil inlet pressure P port channel of the connected executive element, and the pressure oil enters one cavity of the executive element and flows out from the oil liquid in the other cavity of the executive element.

Under the pressure of the emergency pressure supply oil way, an oil return pressure R port channel connected with the actuating element is communicated with an oil return channel 9, return oil enters a valve cavity formed between a second oil return one-way valve 16 and a first oil return one-way valve 7, a one-way valve core of the second oil return one-way valve 16 is tightly attached to the valve port channel to form sealing under the action of a spring force of a second valve spring 15, the entering return oil enters a first oil return connecting channel 4 through an opening of the first oil return one-way valve 7, is communicated with an annular groove b of a step tail shaft III at the right section of the step slide valve 1 and is communicated with an oil return pressure R1 port channel, and a normal pressure supply oil way of the hydraulic system is communicated to.

The center of the right end face of the stepped slide valve 1 is provided with a slender hole 3 which is radially communicated with the second oil inlet connecting channel 17 and the first oil return channel 25, so that when the normal pressure supply oil way is converted into the emergency pressure supply oil way for supplying pressure, the oil inlet channel and the oil return channel of the normal pressure supply oil way are communicated through the slender hole 3, and the reliable conversion of the stepped slide valve 1 and the stable position of the stepped slide valve are ensured; meanwhile, an oil return path and a second oil inlet connecting channel 17 communicated with an oil return pressure R2 port, a radial zigzag through hole 21 communicated with a second oil return one-way valve 16, a first oil return one-way valve 7, an elongated hole 3 radially communicating an oil return pressure R1 port channel oil path and a first oil inlet connecting channel 5 are respectively arranged inside the left and right two sections of step shafts of the step slide valve 1, unloading is carried out through the radial connecting hole of the elongated hole 3, the pressure of the oil paths of the first oil return one-way valve 2 and the second oil return one-way valve 8 is controlled, and when one hydraulic system works, the oil inlet one-way valve 10 or the second oil inlet one-way valve 12 of the other hydraulic system is ensured to be.

The foregoing is directed to the preferred embodiment of the present invention and it is noted that the above-mentioned embodiments illustrate rather than limit the invention, and that those skilled in the art will be able to design alternative embodiments without departing from the scope of the appended claims. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.

Claims

1. A zero-oil-string energy conversion valve for a dual hydraulic system, comprising: the valve body (26) of the double-hydraulic system of the normal pressure supply oil way and the emergency pressure supply oil way of the intercommunication is assembled in the valve body (26) and holds the shaft shoulder of restriction height difference in the chamber, along axis direction motion or motion trend's ladder sliding valve (1), and each section of shaft of ladder sliding valve (1) is made ring channel a, b, c, d and the sealed ring channel that arranges according to the natural order on its characterized in that respectively: the valve body (26) is provided with an unloading hole (23) communicated with a valve cavity stepped hole, the valve cavity upper bodies of the head and tail stepped holes are oppositely symmetrical, radially corresponding annular grooves a, b, c and d are bent upwards in parallel along the potential direction and are respectively communicated with a second oil inlet channel (19) and a first oil return channel (25) of the head and tail stepped hole of the valve cavity, a second oil inlet connecting channel (17) and a second oil return connecting channel (18) are respectively communicated with a first oil return connecting channel (4) and a first oil inlet connecting channel (5), and the second oil inlet connecting channel (17), the second oil return connecting channel (18), the first oil return connecting channel (4) and the first oil inlet connecting channel (5) are respectively communicated with the next two oppositely symmetrical oil return one-way valve cavities which are communicated with an oil return pressure R port channel in the same direction; the second oil inlet connecting passage (17) and the first oil inlet connecting passage (5) are oppositely and symmetrically communicated with a second oil inlet one-way valve cavity to form an oil inlet loop communicated with the oil inlet pressure P port passage, and the two oppositely-opposite first oil return one-way valves (7) and second oil return one-way valves (16) tightly attach the valve cores by means of the pressure of a hydraulic system and the spring forces of the first valve spring (6) and the second valve spring (15), so that the oil return pressure R port passage is closed in a full-sealing manner; the first and second oil inlet check valves (10, 12) are tightly attached to the valve body by means of the spring force of opposite springs (11), an oil inlet pressure P port channel is closed in a full-sealing mode, under the pressure action of a hydraulic system, the normal pressure supply oil path and the emergency pressure supply oil path are separated from each other in an entering mode and an exiting mode through a sealing ring arranged on a stepped sliding valve, and the mutual switching of zero oil mixing energy of the normal pressure supply oil path and the emergency pressure supply oil path of the hydraulic oil path of the oil inlet pressure P port and the oil return pressure R port is achieved respectively, so that the on-off working states of the main hydraulic oil tank and the auxiliary hydraulic oil tank are controlled.

2. The dual hydraulic system zero cross-oil energy conversion valve of claim 1, wherein: the middle section of the stepped sliding valve (1) realizes zero oil mixing by arranging a left cavity sealing ring (22) and a right cavity sealing ring (24); the valve cores of the first oil return one-way valve (7) and the second oil return one-way valve (16) are tightly attached to the inner cavity wall of the valve body (26) of the valve by means of system pressure and spring forces of the first valve spring (6) and the second valve spring (15), and complete sealing is achieved.

3. The dual hydraulic system zero cross-oil energy conversion valve of claim 1, wherein: the first and second oil inlet one-way valves (10, 12) are tightly attached to the inner cavity wall of the valve body (26) by the spring force of the opposite spring (11) to realize complete sealing.

4. The dual hydraulic system zero cross-oil energy conversion valve of claim 1, wherein: in order to further ensure zero oil leakage of the middle section of the stepped sliding valve (1), an unloading hole (23) is formed in the valve body (26) of the valve, so that high-pressure oil trapping is prevented from being formed between sealing rings of a left cavity sealing element (22) and a right cavity sealing element (24), and the mutual switching of the normal pressure supply oil path and the zero oil leakage energy of the emergency pressure supply oil path is realized.

5. The dual hydraulic system zero cross-oil energy conversion valve of claim 1, wherein: the oil inlet pressure P1 pressure oil enters a first oil inlet channel (2) of a cavity stepped hole cavity of a valve body (26) of the communicating valve and acts on the right end face of the stepped sliding valve (1), the stepped sliding valve (1) moves to a left limit position under the action of hydraulic pressure, and at the moment, the oil inlet pressure P1 channel pressure oil enters an annular groove a on the stepped sliding valve (1) through a bypass hydraulic channel and is communicated with a first oil inlet connecting channel (5) through a cavity at the back end of the stepped sliding valve (1).

6. The dual hydraulic system zero cross-oil energy conversion valve of claim 5, wherein: the oil inlet pressure P1 is divided into two paths to flow through the first oil inlet connecting channel (5), one path enters the first oil return one-way valve (7), the one-way valve body is driven to overcome the spring force of the first spring (6), the one-way valve body is pushed to the right limit position, the valve opening is opened, and an oil return pressure R opening channel communicated with the oil return flow is formed; and the other path of pressure oil is sent into the first oil inlet one-way valve (10) through the oil inlet loop, the valve core is driven to compress the opposite-top spring (11) to move to the left under the action of the pressure oil, the valve is opened to be communicated with the oil inlet channel (13), the actuating element actuating cylinder oil inlet channel is communicated to output oil inlet pressure P, and meanwhile, the second oil inlet one-way valve (12) is tightly attached to the outlet valve to block the second oil inlet connecting channel (17) under the action of the opposite-top spring force (11) to form sealing.

7. The dual hydraulic system zero cross-oil energy conversion valve of claim 6, wherein: the pressure oil generated by the oil inlet pressure P is communicated with an oil inlet pressure P port channel of the connected executive element, and the pressure oil enters one cavity of the executive element and flows out from the oil liquid in the other cavity of the executive element.

8. The dual hydraulic system zero cross-oil energy conversion valve of claim 1, wherein: when the pressure of a normal pressure supply oil way is reduced, the right axial force borne by the stepped slide valve (1) is larger than the left axial force borne by the stepped slide valve (1), the stepped slide valve (1) is switched to an emergency pressure supply oil way working state, the normal pressure supply oil way does not work, at the moment, pressure oil P2 of an emergency hydraulic system enters the stepped hole valve cavity through the second oil inlet channel (19), acts on the left end face of the stepped slide valve (1), pushes the stepped slide valve (1) to move to the right limit position under the action of hydraulic pressure, pressure oil P2 bypasses a circulating channel through the second oil inlet channel (19) and the second oil inlet channel (19) to enter the stepped slide valve (1) displacement valve cavity, communicates with the second oil inlet connecting channel (17) through a c-shaped ring groove on a first section of stepped shaft, and flows in two ways through an intersecting communicating flow channel, and enters the second oil return check valve cavity (16) all the way under, overcoming the spring force of a second valve spring (15), pushing the one-way valve body to move to the left limit position to form an opening, and supplying return oil to a return oil pressure R2 port channel through a d-shaped ring groove communicated with a second return oil connecting channel (18); the other path of pressure oil P2 enters a valve cavity of a second oil inlet check valve (12) through a second oil inlet connecting passage (17), a one-way valve core (1) moves rightwards under the action of the pressure oil to open the valve, an oil inlet pressure P port passage connected with an actuating element is communicated, meanwhile, the pressure oil P2 acts on the first oil inlet check valve (10), an opposite-top spring force (11) is compressed, the check valve body is pushed to be tightly attached to the valve and form sealing, so that the pressure oil P2 is communicated with the actuating element through the oil inlet pressure P port passage, enters one cavity from the actuating element and flows out of the other cavity from the actuating element, an oil return pressure R port passage connected with the actuating element is communicated, and oil return enters an oil return passage (9) through the oil return pressure R.

9. The dual hydraulic system zero cross-oil energy conversion valve of claim 1, wherein: under the pressure of an emergency pressure supply oil way, an oil return pressure R port channel connected with an actuating element is communicated with an oil return channel (9), return oil enters a valve cavity formed between a second oil return one-way valve (16) and a first oil return one-way valve (7), a one-way valve core of the second oil return one-way valve (16) is tightly attached to the valve port channel to form sealing under the action of spring force of a second valve spring (15), the entering return oil enters a first oil return connecting channel (4) through an opening of the first oil return one-way valve (7), is communicated with an annular groove b of a step tail shaft III at the right section of the stepped sliding valve (1) and is communicated with an oil return pressure R1 port channel, a normal pressure supply oil way of a hydraulic system is communicated, and a loop for normal.

10. The dual hydraulic system zero cross-oil energy conversion valve of claim 1, wherein: the center of the right end face of the stepped slide valve (1) is provided with a slender hole (3) which is radially communicated with the second oil inlet connecting channel (17) and the first oil return channel (25), so that when a normal pressure supply oil way is converted into an emergency pressure supply oil way for supplying pressure, an oil inlet path and an oil return path of the normal pressure supply oil way are communicated through the slender hole (3), and the stepped slide valve (1) is ensured to be reliably switched and keep a stable position; meanwhile, an oil return path and a second oil inlet connecting channel (17) communicated with an oil return pressure R2 port are respectively arranged inside the left and right two sections of step shafts of the step slide valve (1), a radial zigzag through hole (21) communicated with a second oil return one-way valve (16) controls the first oil return one-way valve (7), an oil path of an oil return pressure R1 port channel and a slender hole (3) of the first oil inlet connecting channel (5) are radially communicated, unloading is carried out through the radial connecting hole of the slender hole (3), oil path pressures of the first oil return one-way valve (2) and the second oil return one-way valve (8) are controlled, and when one hydraulic system works, the oil inlet one-way valve (10) or the second oil inlet one-way valve (12) of the other hydraulic system is.