High-safety anti-clamping stagnation oil way switching valve and control method

Abstract

The invention belongs to the technical field of machinery and hydraulic engineering, and discloses a high-safety anti-clamping oil way switching valve and a control method, the switching valve comprises an oil way switching valve core, an oil way switching valve sleeve, a load output module and a servo control module; when the oil way switching valve element is located at the right limiting position, the first load oil way groove communicates with the first communication oil way groove, and the second load oil way groove communicates with the second communication oil way groove. When the oil way switching valve element is located at the left limiting position, the first working oil way groove communicates with the first load oil way groove, and the second working oil way groove communicates with the second load oil way groove. The first working oil way groove and the second working oil way groove are connected with the servo control module, and the first load oil way groove and the second load oil way groove are connected with the two ends of the load output module respectively. The oil way switching valve has the working mode and the communication mode, installation is easy and convenient, clamping stagnation of the oil way switching valve is prevented through the structural design and the appearance size, and the service life of the system is prolonged.

Description

Technical Field

[0001] This invention belongs to the field of mechanical and hydraulic engineering technology, and relates to an oil circuit switching valve, specifically a high-safety anti-jamming oil circuit switching valve and its control method. Background Technology

[0002] Hydraulic systems, as a crucial component of aircraft hydraulic systems, are indispensable for realizing aircraft flight control functions and ensuring aircraft safety. The hydraulic system achieves various system functions and fail-safe modes primarily through hydraulic function valve blocks. The oil circuit switching valve is a vital component of these valve blocks, enabling the switching of various functions and modes. With the development of modern aircraft hydraulic systems, higher demands are placed on the reliability and safety of hydraulic system functions. The pursuit of high safety and reliability has become a necessity. Therefore, a high-safety, anti-jamming oil circuit switching valve and its control method will greatly improve the safety of hydraulic systems and aircraft, representing an important direction for future hydraulic engineering design development.

[0003] Currently, existing technologies are unable to achieve the anti-jamming function of oil circuit switching valves, or they only rely on adding sensor monitoring modes to detect jamming conditions, without solving the jamming problem from the structural design and control aspects. Jamming of oil circuit switching valves will cause hydraulic system malfunction, reduce system safety, and make it unsuitable for aircraft applications with high safety requirements, and difficult to meet the ever-evolving performance requirements of aircraft. Summary of the Invention

[0004] To address the aforementioned issues, this invention provides a highly secure anti-jamming oil circuit switching valve and its control method. The valve has two operating modes: a working mode and a communication mode. By employing multiple dimensions, it prevents the oil circuit switching valve from jamming, thereby significantly reducing the probability of jamming.

[0005] The technical solution of the present invention is as follows: A high-safety anti-jamming oil circuit switching valve includes an oil circuit switching valve core, an oil circuit switching valve sleeve, a load output module, and a servo control module. The oil circuit switching valve core is axially movable within the oil circuit switching valve sleeve. The oil circuit switching valve sleeve has a first working oil circuit groove, a first load oil circuit groove, a first communication oil circuit groove, a second working oil circuit groove, a second load oil circuit groove, and a second communication oil circuit groove, which are connected. When the oil circuit switching valve core is in the right extreme position, the first and second working oil circuit grooves are closed, the first load oil circuit groove and the first communication oil circuit groove are connected, and the second load oil circuit groove and the second communication oil circuit groove are connected. When the oil circuit switching valve core is in the left extreme position, the first and second communication oil circuit grooves are closed, the first working oil circuit groove and the first load oil circuit groove are connected, and the second working oil circuit groove and the second load oil circuit groove are connected. The first and second working oil circuit grooves are connected to the servo control module, and the first and second load oil circuit grooves are respectively connected to the two ends of the load output module.

[0006] Furthermore, it also includes a sealing threaded cap and a spring. The sealing threaded cap is installed on the left end of the oil circuit switching valve sleeve. The blind hole end inside the sealing threaded cap faces the oil circuit switching valve core. The spring is placed inside the sealing threaded cap. One end of the spring is sleeved on the oil circuit switching valve core, and the other end of the spring is close to the inner end face of the sealing threaded cap.

[0007] Furthermore, a limiting step is provided on the left side of the oil circuit switching valve core. The limiting step of the oil circuit switching valve core is located in the inner hole of the sealing threaded cover. The outer diameter of the limiting step is larger than the inner diameter of the oil circuit switching valve sleeve. A rectangular groove is provided on the outer circular surface of the limiting step of the oil circuit switching valve core. A support ring is provided between the rectangular groove of the oil circuit switching valve core and the sealing threaded cover.

[0008] Furthermore, the inner diameter of the left end of the sealing threaded cover is in a small clearance fit with the outer circle of the spring, and the outer diameter of the left end of the oil circuit switching valve core is in a small clearance fit with the inner circle of the spring, so that the spring force on the oil circuit switching valve core remains concentric during the movement.

[0009] Furthermore, both the oil circuit switching valve core and the oil circuit switching valve sleeve are long shaft hole structures, and the ratio of the shaft length to the outer diameter of the oil circuit switching valve core is greater than or equal to 8:1.

[0010] Furthermore, it also includes normally open solenoid valves and normally closed solenoid valves. The two ends of the oil circuit switching valve core are the left control oil chamber and the right control oil chamber, respectively. The oil is connected to the left control oil chamber through the normally open solenoid valve and the oil is connected to the right control oil chamber through the normally closed solenoid valve.

[0011] A control method for a high-safety anti-jamming oil circuit switching valve, wherein the valve core is in the right limit position and the switching valve is in the communication state when one of the following states is: When the right control chamber is under low pressure and the left control chamber is under high pressure; When both the right and left control chambers are under high voltage; When both the right and left control chambers are under low pressure.

[0012] Furthermore, the on / off states of the normally open and normally closed solenoid valves are monitored to ensure they match the control signal results. If the results match, it indicates normal operation and normal control of the servo control module. If the results do not match, the servo control module enters the neutral communication mode to ensure that the load output module is in communication mode. The advantages of this invention are as follows: 1. This invention provides an oil circuit switching valve with two working modes: working mode and communication mode. It is simple and convenient to install, has a reliable locking method, is small in size and easy to adjust, reduces the difficulty of processing and manufacturing, and increases the application range. 2. This invention prevents the oil circuit switching valve from jamming from multiple dimensions such as external size, structure, and anti-wear by designing valve core and sleeve mechanism, sealing mechanism, anti-offset load mechanism, and temperature change anti-jamming mechanism. This greatly reduces the probability of jamming, reduces oil shock and oscillation caused by system oil circuit switching, and increases the service life of the system. 3. This invention, through a dual-oil-circuit control method, not only greatly reduces the probability of oil-circuit switching valve jamming, but also increases the shear force of pollutants, improves the anti-pollution capability, and the control method is simple and reliable. 4. Based on a switching mechanism without dead space and combined with a fault logic control method, this invention can effectively ensure the safety of the system operation even under extreme conditions where the oil circuit switching valve is stuck in any position with a very low probability. 5. The invention has a simple principle, a simple and compact structural design, is easy to install, has a reliable locking method, is small in size and weight, saves space, and is flexible in layout. At the same time, it can reduce the difficulty of manufacturing and processing, has strong anti-pollution ability, high safety, high environmental adaptability, and a wide range of applications. It improves the reliability and safety of hydraulic systems, reduces oil shock and oscillation caused by system oil circuit switching, and increases the service life of the system. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. The drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a structural schematic diagram of the communication mode of the present invention.

[0015] Figure 2This is a schematic diagram of the working mode structure of the present invention.

[0016] Figure 3 This is a schematic diagram of the limit-locking structure of the present invention. Among them, 1—sealing threaded cover, 2—oil circuit switching valve core, 3—spring, 4—static seal, 5—support ring, 6—oil circuit switching valve sleeve, 7—valve sleeve static seal, 8—load output module, 9—normally open solenoid switch valve, 10—servo control module, 11—normally closed solenoid switch valve. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0018] The features and illustrative embodiments of various aspects of the present invention will now be described in detail. Numerous specific details are set forth in the following detailed description to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that the invention may be practiced without requiring some of these specific details. The following description of embodiments is merely intended to provide a better understanding of the invention by illustrating examples of the invention. The invention is by no means limited to any specific setups and methods set forth below, but covers any improvements, substitutions, and modifications to structures, methods, and devices without departing from the spirit of the invention. Well-known structures and techniques are not shown in the drawings and the following description to avoid unnecessarily obscuring the invention.

[0019] In the description of this invention, it should be noted that the directions or positional relationships indicated by terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing and simplifying the invention, and should not be construed as limiting the invention. Furthermore, the use of ordinal numbers (e.g., "first and second," etc.) is for distinguishing objects and is not limited to this order, and should not be construed as indicating or implying relative importance.

[0020] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly, encompassing both direct connection and indirect connection via an intermediate medium. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0021] It should be noted that, unless otherwise specified, the embodiments of the present invention and the features thereof can be combined with each other, and the various embodiments can be referenced and cited in each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0022] First embodiment: A high-safety anti-jamming oil circuit switching valve includes an oil circuit switching valve core 2, an oil circuit switching valve sleeve 6, a load output module 8, and a servo control module 10. The oil circuit switching valve core 2 is axially movable within the oil circuit switching valve sleeve 6. The oil circuit switching valve sleeve 6 is provided with a first working oil circuit groove, a first load oil circuit groove, a first connecting oil circuit groove, a second working oil circuit groove, a second load oil circuit groove, and a second connecting oil circuit groove. The first connecting oil circuit groove and the second connecting oil circuit groove are connected. When the oil circuit switching valve core 2 is in the right limit position, the first working oil circuit groove and... The second working oil circuit slot is closed, the first load oil circuit slot and the first communication oil circuit slot are connected, and the second load oil circuit slot and the second communication oil circuit slot are connected; when the oil circuit switching valve core 2 is in the left limit position, the first communication oil circuit slot and the second communication oil circuit slot are closed, the first working oil circuit slot and the first load oil circuit slot are connected, and the second working oil circuit slot and the second load oil circuit slot are connected; wherein, the first working oil circuit slot and the second working oil circuit slot are connected to the servo control module 10, and the first load oil circuit slot and the second load oil circuit slot are respectively connected to the two ends of the load output module 8.

[0023] It also includes a sealing threaded cover 1 and a spring 3. The sealing threaded cover 1 is installed on the left end of the oil circuit switching valve sleeve 6. The blind hole end inside the sealing threaded cover 1 faces the oil circuit switching valve core 2. The spring 3 is placed inside the sealing threaded cover 1. One end of the spring 3 is sleeved on the oil circuit switching valve core 2, and the other end of the spring 3 is close to the end face of the inner hole of the sealing threaded cover 1.

[0024] The oil circuit switching valve core 2 has a limiting step on its left side. The limiting step of the oil circuit switching valve core 2 is located in the inner hole of the sealing threaded cover 1. The outer diameter of the limiting step is larger than the inner diameter of the oil circuit switching valve sleeve 6. The outer circular surface of the limiting step of the oil circuit switching valve core 2 has a rectangular groove. A support ring 5 is provided between the rectangular groove of the oil circuit switching valve core 2 and the sealing threaded cover 1.

[0025] The inner diameter of the left end of the sealing threaded cap 1 is in a small clearance fit with the outer circle of the spring 3, and the outer diameter of the left end of the oil circuit switching valve core 2 is in a small clearance fit with the inner circle of the spring 3, so that the spring force on the oil circuit switching valve core 2 remains concentric during the movement.

[0026] Both the oil circuit switching valve core 2 and the oil circuit switching valve sleeve 6 are long shaft hole structures, and the ratio of the shaft length to the outer diameter of the oil circuit switching valve core 2 is greater than or equal to 8:1.

[0027] It also includes a normally open solenoid valve 9 and a normally closed solenoid valve 11. The two ends of the oil circuit switching valve core 2 are the left control oil chamber and the right control oil chamber, respectively. The oil is connected to the left control oil chamber through the normally open solenoid valve 9 and the oil is connected to the right control oil chamber through the normally closed solenoid valve 11.

[0028] A control method for a high-safety anti-jamming oil circuit switching valve, wherein the oil circuit switching valve core 2 is in the right limit position when one of the following states is in the communication state: When the right control chamber is under low pressure and the left control chamber is under high pressure; When both the right and left control chambers are under high voltage; When both the right and left control chambers are under low pressure.

[0029] The system monitors whether the on / off states of normally open solenoid valve 9 and normally closed solenoid valve 11 match the control signal results. If the results match, it indicates normal operation and normal control of servo control module 10. If the results do not match, the servo control module 10 enters the neutral communication mode to ensure that the load output module 8 is in the communication state.

[0030] Second embodiment: To improve the safety and reliability of aircraft hydraulic systems, this invention provides a high-safety anti-jamming oil circuit switching valve and its control method. This oil circuit switching valve has two operating modes: a working mode and a communication mode. Through the design of valve core and sleeve mechanisms, sealing mechanisms, anti-eccentric load mechanisms, and temperature-change anti-jamming mechanisms, it prevents jamming from multiple dimensions, including size, structure, materials, and wear resistance. Furthermore, combined with a dual-oil circuit control method, it significantly reduces the probability of oil circuit switching valve jamming while increasing the shear force of contaminants. Based on a dead-zone-free mechanism design and a fault logic control method, it can handle extreme conditions where the oil circuit switching valve is jammed in any position, ensuring system safety. The oil circuit switching valve is easy to install, has a reliable locking method, is small in size and weight, saves space, and allows for flexible layout. It also reduces manufacturing difficulty, has strong anti-contamination capabilities, high safety, high environmental adaptability, and a wide range of applications. It improves the reliability and safety of the hydraulic system, reduces oil shock and oscillation caused by system oil circuit switching, and increases the system's service life.

[0031] A high-safety anti-jamming oil circuit switching valve and control method are disclosed. The valve features two operating modes, allowing for switching between normal load pathways and fault communication modes between the hydraulic system's servo control module and load output module oil circuits according to control requirements. The valve achieves mode switching in different situations by combining different operating states of control oil circuit A, control oil circuit B, and spring pre-compression force. Through anti-eccentric load structure design, temperature-sensitive anti-jamming structure design, and dual control oil circuits, the valve significantly improves contamination resistance and greatly reduces the probability of jamming. Furthermore, the dead-zone-free mechanism design, combined with fault detection and logic control methods, effectively ensures the safety and reliability of the oil circuit switching valve and the hydraulic system. The product has a simple and reliable structure, is easy to disassemble and assemble, and has a small size. The device includes: an oil circuit switching valve mechanism, a sealing mechanism, an anti-eccentric load mechanism, a temperature-change anti-jamming mechanism, a dual oil circuit control method, a fault logic control method, a switching mechanism without dead space, and a valve sleeve disassembly and assembly mechanism.

[0032] Please see Figure 1 and Figure 2The oil circuit switching valve mechanism includes a sealing threaded cover 1, an oil circuit switching valve core 2, a spring 3, a support ring 5, an oil circuit switching valve sleeve 6, a load output module 8, and a servo control module 10. The oil circuit switching valve core 2, with its stepped end, is installed in the inner hole of the oil circuit switching valve sleeve 6, with the stepped end face of the oil circuit switching valve core 2 being limited by the end face of the oil circuit switching valve sleeve 6. The sealing threaded cover 1 has an internal blind hole end facing the oil circuit switching valve core 2. The spring 3 is placed inside the sealing threaded cover 1, with one end fitted onto the oil circuit switching valve core 2 and the other end pressed against the inner hole end face of the sealing threaded cover 1. The support ring 5 is placed between the oil circuit switching valve core 2 and the inner hole of the sealing threaded cover 1. The entire oil circuit switching valve is positioned in a relatively... The oil circuit switching valve sleeve 6 is pressed by the threaded cap 1 within the inner hole of the valve block structure. The oil circuit switching valve sleeve 6 is limited by the step on the end face of the internal thread. The outer circle of the oil circuit switching valve sleeve 6 has 6 rectangular annular grooves for oil circuits. Each annular groove has 6 circular holes that are evenly distributed radially and communicate with the inner hole. The outer circle of the oil circuit switching valve core 2 has two different diameter outer circular shoulders. The larger diameter shoulder cooperates with the inner hole of the oil circuit switching valve sleeve 6. The oil circuit switching valve core 2 can move linearly in the oil circuit switching valve sleeve 6. The movement position is limited by the threaded cap 1. There is a fuse hole on the hexagonal protrusion on the outside of the threaded cap 1. The oil circuit switching valve is installed into the valve block mechanism. The torque on the threaded cap 1 and the safety lock are used to prevent loosening. The oil circuit switching valve, through the above mechanism, controls the oil A, control oil B, and spring force under different control states. This allows the oil circuit switching valve core 2 to switch between the large-diameter shoulder and the radial circular hole in the oil circuit groove of the oil circuit switching valve sleeve 6, thus achieving the following two modes: In the working mode, the control oil B chamber contains high-pressure oil, and the control oil A chamber contains low-pressure oil. The oil circuit switching valve core 2 moves towards the spring end and overcomes the spring force. It is limited by the threaded cap 1, enabling the load A chamber and load B chamber to be connected to the servo control module 10. The two chambers are isolated, and the load output module 8 is controlled according to the high and low pressure control oil output by the servo control module 10 to achieve the predetermined action. The following situations are communication modes, including low pressure in the control oil B chamber and high pressure in the control oil A chamber, both high pressure in the control oil B chamber and control oil A chamber, and both low pressure in the control oil B chamber and control oil A chamber. In these three situations, the low-pressure oil in the control oil A chamber communicates with the load A chamber and load B chamber, and is isolated from the load output module 8.

[0033] Please see Figure 1The sealing mechanism includes a threaded cap 1, a static seal 4, an oil circuit switching valve sleeve 6, and a valve sleeve static seal 11. Two static seals 4 are placed in the outer circular sealing groove of the threaded cap 1 facing the oil circuit switching valve sleeve 6 to achieve a sealing function and prevent oil leakage. Seven valve sleeve static seals 11 are placed in the outer circular sealing groove of the oil circuit switching valve sleeve 6 to achieve a sealing function and prevent cross-leakage between the six oil circuit grooves and external leakage. At the same time, the valve sleeve static seal 11 adopts a combination of O-ring and sealing cap, which can reduce the width of the sealing groove, thereby reducing the overall length of the oil circuit switching valve and minimizing the external volume. The sealing mechanism can achieve a static sealing function to prevent oil leakage and cross-leakage. The sealing ring is made of high temperature and low temperature resistant material to improve the adaptability and reliability of the device in any environment.

[0034] Please see Figure 1 The anti-eccentricity mechanism includes a threaded cap 1, an oil circuit switching valve core 2, a spring 3, a support ring 5, and an oil circuit switching valve sleeve 6. One reason for the movement jamming of the oil circuit switching valve core 2 and the oil circuit switching valve sleeve 6 is that the oil circuit switching valve core 2 is subjected to an eccentric load in the radial direction. To prevent movement jamming caused by eccentricity, the anti-eccentricity mechanism includes the following two parts: First, a rectangular groove is set on the outer circular surface of the limiting step of the oil circuit switching valve core 2. A support ring 5 is set between the rectangular groove of the oil circuit switching valve core 2 and the threaded cap 1 to ensure that the oil circuit switching valve core 2 and the oil circuit switching valve sleeve 6 remain concentric during movement and prevent jamming. The second part involves a spring 3 fitted onto the oil circuit switching valve core 2, housed within the threaded cover 1. A section of the threaded cover 1 has an inner diameter that is in close clearance with the outer diameter of the spring 3. This close clearance between the inner diameter of the oil circuit switching valve core 2 and the inner diameter of the spring 3 ensures concentricity between the spring 3 and the oil circuit switching valve core 2. This prevents the spring force on the oil circuit switching valve core 2 from becoming concentric during movement. If they are not concentric, there is a risk of jamming due to uneven spring load on the oil circuit switching valve core 2. The anti-eccentricity mechanism prevents jamming of the oil circuit switching valve core 2 and the oil circuit switching valve sleeve 6 caused by uneven load. The support ring 5 is made of polytetrafluoroethylene filled with copper, which increases wear resistance and service life while ensuring support.

[0035] Please see Figure 1 The temperature-change anti-jamming mechanism mainly includes an oil circuit switching valve core 2 and an oil circuit switching valve sleeve 6. Temperature changes can cause thermal expansion and contraction of the oil circuit switching valve core 2 and the oil circuit switching valve sleeve 6, which can lead to the risk of jamming. Therefore, in the structural design of the oil circuit switching valve core 2 and the oil circuit switching valve sleeve 6, the oil circuit switching valve sleeve 6 is limited by a step at the end facing the threaded cover 1, and the oil circuit switching valve core 2 is also limited by a step at this end. The other end is left with a sufficient axial distance from the inner hole of the valve block mechanism, which can accommodate the increase in the size of the oil circuit switching valve core 2 and the oil circuit switching valve sleeve 6 when the temperature increases, and avoid jamming due to insufficient deformation space.

[0036] Please see Figure 1 and Figure 2 The dual-oil-circuit control method is mainly based on the contact of spring 3, and is controlled by a dual oil circuit consisting of a normally open solenoid valve 9 and a normally closed solenoid valve 11. When the normally closed solenoid valve 11 is energized, it outputs high-pressure oil to control oil B; when de-energized, it outputs low-pressure oil to control oil B. Similarly, when the normally open solenoid valve 9 is energized, it outputs low-pressure oil to control oil A; when de-energized, it outputs high-pressure oil to control oil A. During normal system operation, both the normally open solenoid valve 9 and the normally closed solenoid valve 11 are simultaneously energized, resulting in low pressure control oil A and high pressure control oil B, which in turn drives the oil circuit. When the switching valve core 2 overcomes the pre-compression force of the spring 3, the oil circuit switching valve enters the working mode. When the system is powered off, the normally open solenoid valve 9 and the normally closed solenoid valve 11 are simultaneously de-energized. Control oil A is at high pressure and control oil B is at low pressure. Control oil A and spring 3 together push the oil circuit switching valve core 2, and the oil circuit switching valve enters the communication mode. In both of these cases, the force pushing the oil circuit switching valve core 2 exceeds 600N, which can effectively shear contaminants, including general metal particles, that enter between the oil circuit switching valve core 2 and the oil circuit switching valve sleeve 6, increasing the anti-contamination capability and preventing the risk of jamming caused by contaminants entering.

[0037] If the normally open solenoid valve 9 and the normally closed solenoid valve 11 are not working properly and cannot be energized or de-energized, the working status of the oil circuit switching valve is shown in the table below. The purpose is to ensure that the communication function of the oil circuit switching valve can be realized under any circumstances, which greatly improves the safety and reliability of the hydraulic system.

[0038]

[0039] The fault logic control method is mainly implemented through fault detection and logic judgment functions. The logic judgment voter monitors whether the on / off state of the normally open solenoid valve 9 and normally closed solenoid valve 11 matches the control signal result output by the control command calculator. If the result matches, the control command calculator gives a normal working vote result through the logic judgment voter and outputs a normal control signal to the servo control module 10. If the result does not match, a fault vote result is output, causing the servo control module 10 to enter the intermediate communication mode, ensuring that the load output module 8 is in the communication state and will not be stuck. Then, the fault logic control method judges and votes on the actual working state of the normally open solenoid valve 9 and normally closed solenoid valve 11. According to the fault working state, the corresponding method strategy is executed and the servo control module 10 is controlled in conjunction, which greatly improves the system's working safety, efficiency and intelligence.

[0040] Please see Figure 3The aforementioned dead-cavity switching mechanism includes a threaded cap 1, an oil circuit switching valve core 2, a spring 3, and an oil circuit switching valve sleeve 6. In the communication mode, the oil circuit switching valve core 2 has a stepped end face that limits its movement to the end face of the oil circuit switching valve sleeve 6. In the working mode, the oil circuit switching valve core 2 overcomes the spring force and moves through the bottom surface of the inner hole of the threaded cap 1 to limit its movement. At any position during the entire movement of the oil circuit switching valve core 2 from end to end, the oil in the load oil circuit groove will not be in a closed cavity. It will either be connected to the working oil circuit groove or the communication oil circuit groove. The function achieved by this structural design is that in the event that the oil circuit switching valve is stuck, the two load oil circuits of the load output module can always be connected through the working oil circuit groove or through the two cavities of the communication oil circuit groove, preventing the load output module from getting stuck in one position and causing the aircraft to lose control.

[0041] Please see Figure 1 The valve sleeve disassembly and assembly mechanism mainly consists of an internally threaded end in the inner hole of the oil circuit switching valve sleeve 6. Because the oil circuit switching valve sleeve 6 is equipped with seven valve sleeve static seals 11, the friction caused by the seven valve sleeve static seals 11 is relatively large after the oil circuit switching valve is installed into the inner hole of the valve block mechanism, which will make it difficult to disassemble the oil circuit switching valve sleeve 6. Therefore, a corresponding external thread clamp can be designed to cooperate with the internal thread of the oil circuit switching valve sleeve 6, and the oil circuit switching valve sleeve 6 can be removed without damage by relying on the thread cooperation force. The valve sleeve disassembly and assembly mechanism is simple and convenient to design.

[0042] The oil circuit switching valve core 2 and oil circuit switching valve sleeve 6 are long shaft hole structures. The roundness, coaxiality, and surface roughness requirements of the moving pair mating shaft hole are high. The valve sleeve static seal 11 adopts a combination of O-ring and sealing cap. The sealing groove width is small, which reduces the overall length of the oil circuit switching valve. The length of the oil circuit switching valve core 2 and oil circuit switching valve sleeve 6 can also be reduced, making it easier to ensure the roundness, coaxiality, and surface roughness of the moving pair mating shaft hole. This reduces the difficulty of processing and manufacturing and reduces the probability of jamming. At the same time, the oil circuit switching valve core 2 adopts the principle of minimizing the diameter based on the structural design that meets the strength and flow requirements. This can reduce the instantaneous flow rate during movement, increase the movement speed, and move to the position in a shorter time. This reduces the oil shock and oscillation caused by the system oil circuit switching and increases the service life of the system.

[0043] This invention is not limited to oil circuit switching valves with two modes; it is also applicable to oil circuit switching valves with more than two modes.

[0044] In this structure, the surface roughness Ra0.4 or higher of the outer circular surface of the oil circuit switching valve core 2 and the inner hole surface of the oil circuit switching valve sleeve 6, the shaft hole fitting clearance ≤0.01mm, and the coaxiality grade of the inner hole 7 or higher needs to be ensured by machining. The sealing end face and sealing groove roughness Ra0.4 or higher of the sealing thread cover 1 and the oil circuit switching valve sleeve 6.

[0045] The above detailed embodiments are a description of the present invention. It should not be considered that the specific embodiments of the present invention are limited to these descriptions. For those skilled in the art, several simple deductions and substitutions can be made without departing from the concept of the present invention, and all of these should be considered to fall within the protection scope of the present invention.

Claims

1. A high-safety anti-seizure oil passage switching valve characterized by comprising: The oil path switching valve core (2), the oil path switching valve sleeve (6), the load output module (8) and the servo control module (10) are included, the oil path switching valve core (2) is arranged in the oil path switching valve sleeve (6) and can be moved axially, the oil path switching valve sleeve (6) is provided with a first working oil path groove, a first load oil path groove, a first communication oil path groove, a second working oil path groove, a second load oil path groove and a second communication oil path groove, the first communication oil path groove and the second communication oil path groove are communicated; when the oil path switching valve core (2) is in the right limit position, the first working oil path groove and the second working oil path groove are closed, the first load oil path groove and the first communication oil path groove are communicated, and the second load oil path groove and the second communication oil path groove are communicated; when the oil path switching valve core (2) is in the left limit position, the first communication oil path groove and the second communication oil path groove are closed, the first working oil path groove and the first load oil path groove are communicated, and the second working oil path groove and the second load oil path groove are communicated; wherein, the first working oil path groove and the second working oil path groove are connected with the servo control module (10), and the first load oil path groove and the second load oil path groove are respectively connected with two ends of the load output module (8).

2. The high-safety anti-seizing oil passage switching valve according to claim 1, characterized by The sealing threaded cover (1) and the spring (3) are further included, the sealing threaded cover (1) is installed at the left end of the oil path switching valve sleeve (6), the blind hole end in the sealing threaded cover (1) is towards the oil path switching valve core (2), the spring (3) is arranged in the sealing threaded cover (1), one end of the spring (3) is sleeved on the oil path switching valve core (2), and the other end of the spring (3) is attached to the inner hole end surface of the sealing threaded cover (1).

3. The high-safety anti-sticking oil passage switching valve according to claim 2, characterized by The oil path switching valve core (2) is provided with a limiting step at the left side, the limiting step of the oil path switching valve core (2) is in the inner hole of the sealing threaded cover (1), the outer diameter of the limiting step is greater than the inner diameter of the oil path switching valve sleeve (6), the outer circular surface of the limiting step of the oil path switching valve core (2) is provided with a rectangular groove, and the support ring (5) is arranged between the rectangular groove of the oil path switching valve core (2) and the sealing threaded cover (1).

4. The high-safety anti-seizing oil passage switching valve according to claim 3, characterized by The inner hole diameter of the sealing threaded cover (1) at the left end is in small gap cooperation with the outer circle of the spring (3), and the outer diameter of the left end of the oil path switching valve core (2) is in small gap cooperation with the inner circle cooperation section of the spring (3), so that the spring force received by the oil path switching valve core (2) during movement is kept concentric.

5. The high-safety anti-sticking oil passage switching valve according to claim 1, characterized by The oil path switching valve core (2) and the oil path switching valve sleeve (6) are both long shaft hole structures, and the ratio of the shaft length to the outer diameter of the oil path switching valve core (2) is greater than or equal to 8:

1.

6. The high-safety anti-sticking oil passage switching valve according to claim 1, characterized by The normally open electromagnetic on-off valve (9) and the normally closed electromagnetic on-off valve (11) are further included, two ends of the oil path switching valve core (2) are respectively a left control oil cavity and a right control oil cavity, oil liquid is connected with the left control oil cavity through the normally open electromagnetic on-off valve (9), and oil liquid is connected with the right control oil cavity through the normally closed electromagnetic on-off valve (11).

7. A control method of a high-safety anti-seizing oil passage switching valve, using the high-safety anti-seizing oil passage switching valve according to claim 6, characterized by, The oil path switching valve core (2) is in the right limit position when being in one of the following states, and the switching valve is in the communication state: When the right control cavity is connected with low pressure and the left control cavity is connected with high pressure; When the right control cavity and the left control cavity are both connected with high pressure; When the right control cavity and the left control cavity are both connected with low pressure.

8. The control method of the high-safety anti-sticking oil passage switching valve according to claim 7, using the high-safety anti-sticking oil passage switching valve according to claim 6, characterized by The on-off state of the normally open electromagnetic switch valve (9) and the normally closed electromagnetic switch valve (11) is monitored to match the control signal result, if the result matches, it indicates that the work is normal, and the servo control module (10) is normally controlled; if the result does not match, the servo control module (10) enters the middle communication mode, and the load output module (8) is ensured to be in the communication state.

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