An oil passage on-off control device
By designing an oil circuit on/off control device, the synchronous switching of the oil inlet and multiple oil outlets is achieved using valve cores and electromagnets. This solves the problems of oil circuit switching delay and leakage in traditional hydraulic pumps, realizes a highly efficient and compact hydraulic system design, and improves system reliability and safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- NINGBO INSTITUTE OF TECHNOLOGY BEIHANG UNIVERSITY
- Filing Date
- 2025-07-02
- Publication Date
- 2026-08-04
AI Technical Summary
Traditional hydraulic pumps suffer from response delays during oil circuit switching, high leakage rates in sealing structures, complex pipeline topologies, and large space requirements, all of which affect system reliability and flight safety.
An oil circuit on/off control device was designed. The valve core is driven to move within the valve body by a valve core and an electromagnet to achieve synchronous switching between the oil inlet and multiple oil outlets. A single sliding sealing interface and annular sealing ring are used to integrate oil inlet distribution, outlet selection and return oil management functions into a coaxial nested component, reducing leakage and device size.
It achieves instantaneous oil circuit switching, reduces actuator vibration caused by hydraulic shock, lowers the risk of leakage, and the device is compact in size, meeting the requirements of compact layout and redundancy fault tolerance of aviation hydraulic systems.
Smart Images
Figure CN224592456U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of hydraulic pump technology, specifically to an oil circuit on / off control device. Background Technology
[0002] As the power component of the aircraft hydraulic system, the hydraulic pump converts mechanical energy into hydraulic energy. In the aircraft hydraulic system, actuators (such as servos and actuators) and pressure regulating mechanisms often need to dynamically switch the high-pressure oil (3000-5000psi) from a single pump source to different outlets. Traditional solutions use separate valve groups to achieve oil circuit distribution, but they have core defects such as delayed switching response leading to oil circuit interruption and pressure fluctuation, high leakage rate of multi-valve sealing structure, complex pipeline topology occupying too much space, and reliance on secondary valve action for emergency switching, which seriously restrict the reliability of the system and flight safety.
[0003] To overcome the above problems, there is an urgent need for a highly integrated multi-outlet switching device that can achieve zero-window switching from a single inlet to multiple outlets, minimize sealing paths, and simplify topology design, so as to meet the stringent requirements of aviation hydraulic systems for instantaneous response, compact layout, and redundancy tolerance. Utility Model Content
[0004] To address the problems of existing technologies, this utility model proposes an oil circuit on / off control device, the specific solution of which is as follows:
[0005] An oil circuit on / off control device includes: a valve seat, a valve body, a valve core, a spring, and two electromagnets. The two electromagnets are located on the left and right sides of the valve seat, respectively. A cylindrical hole is formed along the axis in the middle of the valve seat. The valve body is fitted into the cylindrical hole in the valve seat. A cylindrical hole is formed along the axis in the middle of the valve body. The valve core is installed in the cylindrical hole in the valve body. The outer diameters of the two ends of the valve core are smaller than the outer diameter of the middle section. The middle section of the valve core is in contact with the inner wall of the valve body. The two ends of the valve core pass through the valve body and the valve seat in sequence, located within the electromagnet area. Springs are wound around the smaller outer diameter ends of the valve core inside the valve seat. The two ends of the valve seat are sealed. The upper end face of the valve seat has three oil ports from left to right: a return oil port T1, an inlet oil port P, and a return oil port T2. The P port branches into three oil ports inside the valve seat. The lower end face of the valve seat has three oil outlet ports from left to right: a port P3, a port P1, and a port P2. The valve body has holes A and B from left to right. Holes C, D, E, F, and G are radially through holes in the valve body. From left to right, the middle section of the valve core's large outer diameter has non-through annular holes a, b, c, d, and e on its outer circumference. Holes a and b are connected internally within the valve core, as are holes d and e. Hole c is radially through. Hole A connects to port T1. Hole B corresponds to the area between holes a and b and connects to port P3. Hole C is located to the right of hole b and connects to the leftmost oil port branching off from port P. Hole D connects to hole c, the middle oil port branching off from port P, and port P1. Hole E is located to the left of hole d and connects to the rightmost oil port branching off from port P. Hole F corresponds to the area between holes d and e and connects to port P2. Hole G connects to T2. Holes A and G correspond to the two ends of the valve core's small outer diameter, and the space between the two ends of the valve core's small outer diameter forms a return oil tank.
[0006] Furthermore, the valve seat, valve body, and valve core are all cylindrical.
[0007] Furthermore, a screw plug is installed at one end of the valve seat, and the screw plug is sealed to the valve seat by a second sealing ring. The two ends of the small outer diameter of the valve core pass through the valve seat and the screw plug respectively and are sealed by the first sealing ring.
[0008] Furthermore, annular sealing rings are installed between holes A and B, between holes B and C, between holes E and F, and between holes F and G.
[0009] Furthermore, an annular countersunk hole is provided on the valve body, and a through hole that runs radially through the valve body communicates with the annular countersunk hole near the outer cylindrical surface.
[0010] Furthermore, the passages between holes a and b inside the valve core are intersecting passages, as are the passages between holes d and e inside the valve core.
[0011] Furthermore, a return oil T-port is provided on the lower end face of the valve seat, and the T-port is connected to the hole G.
[0012] The control method of the above-mentioned oil circuit on / off control device maintains that the electromagnets on both sides of the valve seat are not energized, the valve core is kept in the neutral position in the oil circuit on / off control device, the P port is connected to the P1 port through holes D and c, the valve core isolates the hole C on the valve body from the hole b on the valve core, isolates the hole E on the valve body from the hole d on the valve core, and disconnects the P port from the P3 and P2 ports, thus realizing the oil circuit connection from P to P1; the electromagnets on both sides of the valve seat are the left electromagnet and the right electromagnet, respectively, maintaining... When the left electromagnet is de-energized and the right electromagnet is energized to generate thrust, the valve core moves to the left and is in the left position. Port P is connected to port P2 through holes E, d, and e, while port P is disconnected from ports P3 and P1, thus achieving oil circuit connection from P to P2. When the right electromagnet is de-energized and the left electromagnet is energized to generate thrust, the valve core moves to the right and is in the right position. Port P is connected to port P3 through holes C, b, and a, while port P is disconnected from ports P1 and P2, thus achieving oil circuit connection from P to P3.
[0013] This invention achieves precise flow distribution between the pre-set connecting channels (ab, de) inside the valve core and the radial holes in the valve body. When the valve core is moved left and right by the electromagnet, the connection / disconnection of the oil inlet P and the target outlets P1 / P2 / P3 is completed synchronously, eliminating the oil circuit interruption window of traditional valves that operate in series and avoiding actuator vibration caused by hydraulic shock. Furthermore, when both electromagnets are de-energized, the spring forces the valve core to automatically reset to the neutral position, unconditionally connecting the P→P1 channel, which can then be used as the main control oil circuit, reducing switching time. Additionally, this invention relies solely on a single sliding sealing interface between the middle section of the valve core and the inner wall of the valve body to control all high-pressure oil circuits, and annular sealing rings are installed between the oil circuits to reduce oil leakage. Moreover, this device integrates the functions of oil inlet distribution (P-port branching), outlet selection (P1 / P2 / P3), and return oil management (T1 / T2) into a coaxially nested valve seat-valve body-valve core assembly, eliminating intersecting external pipelines, achieving high integration, and reducing the size of the device. Attached Figure Description
[0014] The embodiments of this utility model will be further described below with reference to the accompanying drawings, wherein:
[0015] Figure 1 A cross-sectional view of the valve core in the oil circuit on / off control device of the embodiment when it is in the neutral position is shown.
[0016] Figure 2 A cross-sectional view of the valve core in the oil circuit on / off control device of the embodiment is shown when it is in the left position.
[0017] Figure 3 A cross-sectional view of the valve core in the oil circuit on / off control device of the embodiment is shown.
[0018] Wherein, 1-left electromagnet; 2-first sealing ring; 3-valve core; 4-valve body; 5-spring, 5-1 left spring, 5-2 right spring; 6-valve seat; 7-annular sealing ring; 8-second sealing ring; 9-screw plug; 10-right electromagnet. Detailed Implementation
[0019] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.
[0020] In one embodiment, an oil circuit on / off control device includes: a valve seat 6, a valve body 4, a valve core 3, a spring 5, and two electromagnets. The valve seat 6, valve body 4, and valve core 3 are all metal cylinders. The two electromagnets are located on the left and right sides of the valve seat 6, respectively. A cylindrical hole is formed along the axis in the middle of the valve seat 6. The valve body 4 is fitted into the cylindrical hole in the valve seat 6. A cylindrical hole is formed along the axis in the middle of the valve body 4. The valve core 3 is installed in the cylindrical hole in the valve body 4. The outer diameters of the two ends of the valve core 3 are smaller than the outer diameter of the middle section. The middle section of the valve core 3 is in contact with the inner wall of the valve body 4. The two ends of the valve core 3 pass through the valve body 4 and the valve core 5 in sequence. The valve seat 6 is located within the electromagnet area. The valve core 3 is located inside the valve seat 6, with springs 5 wound around both ends of its small outer diameter. The left spring is 5-1, and the right spring is 5-2. A screw plug 9 is installed at one end of the valve seat 6, and the screw plug 9 is sealed to the valve seat 6 by a second sealing ring 8. The two ends of the small outer diameter of the valve core 3 pass through the valve seat 6 and the screw plug 9 respectively, and are both sealed by the first sealing ring 2. The upper surface of the valve seat 6 has three oil ports from left to right: a return oil port (T1), an inlet oil port (P), and a return oil port (T2). The P port branches into three oil ports inside the valve seat 6. The lower surface of the valve seat 6 has three oil ports from left to right: a P3 port, a P4 port, and a P5 port. The valve body 4 has three oil outlets: P1 and P2. From left to right, the valve body 4 has holes A, B, C, D, E, F, and G. These holes are radially through holes. The valve body 4 also has an annular countersunk hole. The radially through holes in the valve body 4 connect with the annular countersunk hole near the outer cylindrical surface. The valve core 3 has, from left to right, non-intersecting, annular (groove) holes a, b, c, d, and e on its outer circumference in the middle section of its large outer diameter. Holes a and b are connected within the valve core 3 via a passageway, and holes d and e are also connected within the valve core 3 via a passageway. All passageways are intersecting. It can also be other shapes that allow for communication. Hole c is radially through; hole A is connected to port T1; hole B corresponds to the area between holes a and b, and is connected to port P3; hole C is located to the right of hole b and is connected to the leftmost oil port branching off from port P; hole D is connected to hole c, the middle oil port branching off from port P, and port P1; hole E is located to the left of hole d and is connected to the rightmost oil port branching off from port P; hole F corresponds to the area between holes d and e, and is connected to port P2; hole G is connected to T2; holes A and G correspond to the two ends of the small outer diameter of valve core 3, and the space between the two ends of the small outer diameter of valve core 3 forms the return oil tank. Annular sealing rings 7 are installed between holes A and B, between holes B and C, between holes E and F, and between holes F and G. Sealing rings 7 are used for communication between adjacent holes; screw plugs 9 are used for limiting and fixing valve body 4; and sealing rings 2 are used to seal the return oil to prevent external leakage.
[0021] In one embodiment, an oil circuit on / off control device is connected to a pressure regulating mechanism. The lower end face of the valve seat 6 of the oil circuit on / off control device also has a return oil port T, which communicates with the orifice G. The three oil outlets of the oil circuit on / off control device (P3, P1, and P2) are connected to the oil inlets of the three different regulating pressure chambers of the pressure regulating mechanism, and the return oil port T of the oil circuit on / off control device is connected to the return oil port of the pressure regulating mechanism. The on / off state of the high-pressure outlet oil circuit and the corresponding chamber for the required pressure regulation can be controlled in real time according to the pressure requirements of the variable pump multi-stage pressure regulating control device. To ensure high-pressure operation, the high-pressure outlet oil circuit of the hydraulic pump is connected to the corresponding high-pressure chamber of the multi-stage pressure regulation and control device under high-pressure load flight conditions, providing high pressure to the hydraulic system. Under low-pressure load flight conditions, the high-pressure outlet oil circuit of the hydraulic pump is connected to the corresponding low-pressure chamber of the multi-stage pressure regulation and control device, providing low pressure to the hydraulic system. At startup, the high-pressure outlet oil circuit of the hydraulic pump is connected to the corresponding lowest pressure chamber of the multi-stage pressure regulation and control device, and the hydraulic pump operates at the lowest pressure, enabling the hydraulic pump to start with the lowest power loss mode, reducing the engine startup burden and onboard power supply.
[0022] A control method for the above-mentioned oil circuit on / off control device has the following three states:
[0023] (1) The electromagnets on both sides of the valve seat 6 are the left electromagnet 1 and the right electromagnet 10 respectively. The left electromagnet 1 and the right electromagnet 10 are kept unenergized. The valve core 3 is kept in the neutral position in the oil circuit on / off control device. The P port is connected to the P1 port through the holes D and c. The valve core 3 isolates the hole C on the valve body 4 from the hole b on the valve core 3, and isolates the hole E on the valve body 4 from the hole d on the valve core 3. The P port is disconnected from the P3 port and the P2 port, so that the oil circuit from P to P1 is connected.
[0024] (2) The electromagnets on both sides of the valve seat 6 are the left electromagnet 1 and the right electromagnet 10 respectively. The left electromagnet 1 is kept unenergized, and the right electromagnet 10 is energized to generate thrust. The valve core 3 moves to the left and is in the left position. The P port is connected to the P2 port through the holes E, d, and e. The P port is disconnected from the P3 port and the P1 port, so that the oil passage from P to P2 is connected.
[0025] (3) The electromagnets on both sides of the valve seat 6 are the left electromagnet 1 and the right electromagnet 10 respectively. The right electromagnet 10 is kept unenergized, and the left electromagnet 1 is energized to generate thrust. The valve core 3 moves to the right and is in the right position. The P port is connected to the P3 port through the holes C, b, and a. The P port is disconnected from the P1 port and the P2 port, so that the oil circuit from P to P3 is connected.
[0026] The foregoing description describes some exemplary embodiments of this utility model. It is understood that the above embodiments are only used to explain this utility model and do not constitute a limitation on the scope of protection of this utility model. The features in these embodiments can be recombine in a suitable manner, and the resulting solutions are still within the scope of protection claimed by this utility model. Based on the above embodiments, all other embodiments obtained by those skilled in the art without inventive effort, that is, all modifications, equivalent substitutions, and improvements made within the spirit and principles of this application, fall within the scope of protection claimed by this utility model.
Claims
1. A hydraulic circuit on / off control device, characterized in that, include: The valve consists of a valve seat (6), a valve body (4), a valve core (3), a spring (5), and two electromagnets. The two electromagnets are located on the left and right sides of the valve seat (6). A cylindrical hole is opened in the middle of the valve seat (6) along the axis. The valve body (4) is fitted into the cylindrical hole of the valve seat (6). A cylindrical hole is opened in the middle of the valve body (4) along the axis. The valve core (3) is installed in the cylindrical hole of the valve body (4). The outer diameters of the two ends of the valve core (3) are smaller than the outer diameter of the middle section. The middle section of the valve core (3) is flush with the inner wall of the valve body (4). The valve core (3) is fitted together, with its two ends passing through the valve body (4) and valve seat (6) in sequence within the electromagnet area. Springs (5) are wound around both ends of the small outer diameter of the valve core (3) inside the valve seat (6), and the valve seat (6) is sealed at both ends. The upper surface of the valve seat (6) has three oil ports from left to right: a return oil port (T1), an inlet oil port (P), and a return oil port (T2). The P port is branched into three oil ports inside the valve seat (6). The lower surface of the valve seat (6) has three outlet ports from left to right: a P3 port, a P1 port, and a P2 port. Oil port; The valve body (4) has holes A, B, C, D, E, F, and G respectively from left to right. The holes in the valve body (4) are radially through holes; The valve core (3) has annular holes a, b, c, d, and e respectively from left to right on the outer circumference of the middle section of the large outer diameter. Holes a and b are connected inside the valve core (3), and holes d and e are connected inside the valve core (3). Hole c is radially through; Hole A is connected to port T1, and hole B is connected to port T1. Between holes a and b, hole B is connected to port P3, hole C is located to the right of hole b and is connected to the leftmost oil port branching off from port P, hole D is connected to hole c, the middle oil port branching off from port P, and P1, hole E is located to the left of hole d and is connected to the rightmost oil port branching off from port P, hole F corresponds to between holes d and e, hole F is connected to port P2, hole G is connected to T2, holes A and G correspond to the two ends of the small outer diameter of valve core (3), and the space at the two ends of the small outer diameter of valve core (3) forms the return oil tank.
2. The oil circuit on / off control device according to claim 1, characterized in that, The valve seat (6), valve body (4), and valve core (3) are all cylindrical.
3. The oil circuit on / off control device according to claim 1, characterized in that, A screw plug (9) is installed at one end of the valve seat (6). The screw plug (9) and the valve seat (6) are sealed by a second sealing ring (8). The two ends of the small outer diameter of the valve core (3) pass through the valve seat (6) and the screw plug (9) respectively and are sealed by a first sealing ring (2).
4. The oil circuit on / off control device according to claim 1, characterized in that, An annular sealing ring (7) is installed between holes A and B, between holes B and C, between holes E and F, and between holes F and G.
5. The oil circuit on / off control device according to claim 1, characterized in that, The valve body (4) is also provided with an annular countersunk hole, and the through hole in the valve body (4) that runs radially through it is connected to the annular countersunk hole near the outer cylindrical surface.
6. The oil circuit on / off control device according to claim 1, characterized in that, The passages opened by holes a and b inside the valve core (3) are intersecting passages, and the passages opened by holes d and e inside the valve core (3) are intersecting passages.
7. The oil circuit on / off control device according to claim 1, characterized in that, The lower end face of the valve seat (6) is also provided with an oil return port T, which is connected to the hole G.