A multi-stage pressure regulating control device for a hydraulic pump

Abstract

The application relates to the technical field of hydraulic pumps, in particular to a multistage pressure regulating control device of a hydraulic pump. The regulating control device comprises a plug, a valve seat, a valve body, three valve cores, three jacks, a pressure regulating spring, the left side of the plug is mounted on the valve seat to seal, and the right side is sealed by rotating a regulating screw; the valve body is installed in the valve seat, three valve cores are sequentially installed in the valve body from left to right, the outer side walls of the middle sections of the three valve cores are tightly attached to the inner side walls of the valve body, the outer diameters of the middle sections of the three valve cores sequentially decrease from left to right, three cavities are formed between the plug and the three valve cores, one jack is inserted in each valve core, and the pressure regulating spring is installed at the right end of the rightmost jack; and corresponding ports and holes are formed on the valve seat and the valve body to form an oil flow channel. The device is designed with three oil inlets corresponding to three cavities, so that the hydraulic pump can work in a multistage pressure mode, the system heating and energy loss are reduced, and energy saving, emission reduction and energy optimization are realized.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic pump technology, specifically to a multi-stage pressure regulation and control device for a hydraulic pump. Background Technology

[0002] In aircraft hydraulic systems, hydraulic pumps, as key power components, play a crucial role in converting mechanical energy into hydraulic energy. Currently, aviation hydraulic pumps are typically set to a single rated pressure value based on the peak pressure requirements of the hydraulic system. However, the load on an aircraft's hydraulic system varies significantly under different flight conditions: the highest pressure is required only for brief periods during specific flight phases (such as landing gear retraction and flap operation), while lower pressure is sufficient for most of the flight time. This single-pressure operating mode, based on peak pressure design, results in the hydraulic pump outputting high pressure under most low-load conditions, leading to significant energy waste. Furthermore, for airborne electric pumps and engine-driven hydraulic pumps, operation at rated high pressure upon startup generates extremely high input power demands (electrical or mechanical power), significantly increasing the burden on the onboard power supply system and substantially increasing the engine's startup load. Therefore, a technology is urgently needed that can adjust the hydraulic pump output pressure in real-time and precisely according to flight conditions to address the energy efficiency and startup performance issues of existing single-pressure hydraulic pumps. Utility Model Content

[0003] To address the problems of the prior art, this application proposes a multi-stage pressure regulation and control device for a hydraulic pump, the specific solution of which is as follows:

[0004] A multi-stage pressure regulating control device for a hydraulic pump includes: a plug, a valve seat, a valve body, an adjusting screw, three valve cores, three push rods, and a pressure regulating spring. The left side of the multi-stage pressure regulating control device is sealed by the plug mounted on the valve seat, and the right side is sealed by the adjusting screw. The valve seat and valve body are hollow structures, with the valve body installed in the valve seat and its outer side wall tightly against the inner side wall of the valve seat. The horizontal length of the valve body is less than the horizontal length of the valve seat. The three valve cores are installed in the valve body from left to right: the two valve cores on the left have a structure with a larger outer diameter in the middle section and smaller outer diameters at both ends, while the valve core on the right has a structure with a larger outer diameter in the middle section and smaller outer diameters at both ends. The valve body has a three-section structure with an increasing outer diameter to the right. The outer walls of the middle sections of the three valve cores are all tightly attached to the inner wall of the valve body. The left end face of the rightmost valve core with the largest outer diameter abuts against the rightmost side of the valve body. The outer diameters of the middle sections of the three valve cores decrease sequentially from left to right. Each valve core has a small hole along the horizontal axis, and a push rod is inserted into each small hole. The left end of the pressure regulating spring is installed at the right end of the rightmost push rod, and the right end of the pressure regulating spring is installed in the inner hole of the adjusting screw. The upper end face of the valve seat has oil inlets P3, P1, P2 and oil return T, and the lower end face has P... k Mouth, P kThe valve seat branches into three branches; the valve body has radially penetrating holes a, b, c, d, e, and f sequentially from left to right. Port P3 connects to hole a, port P1 connects to hole c, and port P2 connects to hole e. Holes b, d, and f connect to P... k The three branches of the port are connected; the T port is connected to the cavity where the rightmost push rod is located. In the initial state, holes a, c, and e are respectively connected to the cavities where the left ends of the three valve cores are located. Holes b, d, and f are respectively abutted against the middle sections of the three valve cores. A "one-line" groove is opened on the right end face of the rightmost valve core. A hole g is opened on the middle section of the rightmost valve core. The outer diameter of the push rod corresponding to the right end face of hole g is smaller than the outer diameter of the push rod corresponding to the left side of hole g. Hole g and the "one-line" groove are connected through the cavity formed between the valve core and the push rod. The "one-line" groove is connected to the cavity where the rightmost push rod is located. The three push rods abut against each other end to end.

[0005] Furthermore, the valve body has annular grooves formed on its outer circumference from left to right, and each annular groove is connected to holes a, b, c, d, e, and f respectively.

[0006] Furthermore, the valve seat has P3, P1, P2, and P ports. k Both sides of the opening and the T-shaped opening are equipped with annular sealing rings.

[0007] Furthermore, annular sealing rings are installed on the right side of holes a, b, c, d, e, and f on the valve body.

[0008] Furthermore, the plug contacts the valve seat, and a left-end sealing ring is installed between the contact surfaces.

[0009] Furthermore, a right-end sealing ring is installed between the adjusting screw and the inner wall of the valve seat.

[0010] Furthermore, the outer periphery of the adjusting screw is secured by a lock nut.

[0011] Furthermore, the plug is installed on the valve seat by screws.

[0012] Furthermore, each of the three push rods has a rod head at its right end, and the outer diameter of the rod head is larger than the inner diameter of the small hole through which the push rod passes.

[0013] A control method for the above-mentioned multi-stage pressure regulation and control device includes graded control and regulation in the following three states:

[0014] (1) When oil is supplied to port P1, P3 and P2 are isolated. High-pressure oil flows through hole c into the cavity between the valve body, the leftmost valve core, and the middle valve core. When the oil pressure does not reach the set pressure P1, the middle valve core, under the action of the pressure regulating spring, isolates hole c from hole d. kThe return oil is sequentially connected to port T via holes f, g, and T, and the hydraulic pump operates under pressure P1. When the oil pressure gradually reaches the set pressure P1, the hydraulic pressure overcomes the spring force of the pressure regulating spring, sequentially pushing the middle valve core and its push rod, and finally the push rod of the rightmost valve core to the right. Holes c and d connect, while holes f, g, and T are disconnected, allowing high-pressure oil to flow through P... k The inlet enters the hydraulic pump swashplate variable mechanism;

[0015] (2) When oil is supplied to port P2, P3 and P1 are isolated. High-pressure oil flows through port e into the cavity between the valve body, the rightmost valve core, and the middle valve core. When the oil pressure does not reach the set pressure P2, the middle valve core, under the action of the pressure regulating spring, isolates port e from port f. k The return oil is sequentially connected to port T via orifice f, orifice g, and the hydraulic pump operates under pressure P2. When the oil pressure gradually reaches the set pressure P2, the hydraulic pressure overcomes the spring force of the pressure regulating spring, pushing the rightmost valve core and its push rod to the right. Orifice e connects to orifice f, while orifice f, orifice g, and port T are disconnected. High-pressure oil then flows through port P... k The inlet enters the hydraulic pump swashplate variable mechanism;

[0016] (3) When oil is supplied to port P3, P1 and P2 are isolated. High-pressure oil flows through hole a into the cavity between the valve body, the left valve core, and the plug. When the oil pressure does not reach the set pressure P3, the intermediate valve core, under the action of the pressure regulating spring, isolates hole a from hole b. k The return oil is sequentially connected to port T via orifice f, orifice g, and the hydraulic pump operates under pressure P3. When the oil pressure gradually reaches the set pressure P3, the hydraulic pressure overcomes the spring force of the pressure regulating spring, pushing the leftmost valve core and its push rod, as well as the push rods in the middle and right valve cores, to move to the right. Orifice a connects with orifice b, while orifice f, orifice g are disconnected from port T. High-pressure oil then flows through port P... k The inlet enters the hydraulic pump swashplate variable mechanism;

[0017] The pressure of the high-pressure oil is P3. <P1<P2。

[0018] The multi-stage pressure regulation and control device of this application can be widely used in aviation variable displacement hydraulic pumps. It can adjust the working pressure of the hydraulic pump according to the aircraft's flight status. Under high-pressure load flight conditions, the hydraulic pump operates at high pressure, providing high pressure to the hydraulic system; under low-pressure load flight conditions, the hydraulic pump operates at low pressure, providing low pressure to the hydraulic system; at startup, the hydraulic pump operates at its lowest pressure, enabling it to start with minimal power loss, reducing the engine's starting burden or the aircraft's power supply. The hydraulic pump can switch between multiple pressure modes, reducing the increase in useless power caused by increased hydraulic system pressure, lowering system heat generation and energy loss, and achieving energy conservation, emission reduction, and optimized energy allocation. Attached Figure Description

[0019] The embodiments of this utility model will be further described below with reference to the accompanying drawings, wherein:

[0020] Figure 1 A cross-sectional structural schematic diagram of the multi-stage pressure regulation and control device in the embodiment in its non-operating state is shown;

[0021] Figure 2 A cross-sectional structural schematic diagram of the multi-stage pressure regulation and control device P1 port in the embodiment with oil flowing through is shown;

[0022] Figure 3 A cross-sectional structural schematic diagram of the multi-stage pressure regulation and control device in the embodiment with oil flowing through port P2 is shown.

[0023] Figure 4 A cross-sectional structural schematic diagram of the multi-stage pressure regulation and control device P3 port in the embodiment with oil flowing through is shown.

[0024] Among them, 1-plug; 2-left end sealing ring; 3-valve seat; 4-annular sealing ring; 5-valve body; 6-annular sealing ring; 7-locking nut; 8-adjusting screw; 9-screw; 10-A push rod; 11-A valve core; 12-B valve core; 13-B push rod; 14-C valve core; 15-C push rod; 16-right end sealing ring; 17-pressure adjusting spring. Detailed Implementation

[0025] 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.

[0026] In one embodiment, a multi-stage pressure regulating control device for a hydraulic pump includes: a plug 1, a valve seat 3, a valve body 5, an adjusting screw 8, three valve cores (from left to right: valve core A 11, valve core B 12, and valve core C 14), three push rods (from left to right: push rod A 10, push rod B 13, and push rod C 15), and a pressure regulating spring 17. The left side of the multi-stage pressure regulating control device is sealed by the plug 1 mounted on the valve seat 3, and the right side is sealed by the adjusting screw 8. Both seat 3 and valve body 5 are hollow structures, with the hollow portion being a cylindrical stepped hole structure. Valve body 5 is installed in valve seat 3, and the outer wall of valve body 5 is tightly attached to the inner wall of valve seat 3. The horizontal length of valve body 5 is less than the horizontal length of valve seat 3. Three valve cores are installed in valve body 5 from left to right: valve core A 11 and valve core B 12 on the left are both structures with a large outer diameter in the middle section and a small outer diameter at both ends; valve core C 14 is a three-section structure with an increasing outer diameter from left to right. The outer walls of the middle sections of all three valve cores are tightly attached to the valve body 3. On the inner wall of body 5, the left end face of the right end of the large outer diameter of valve core 14 abuts against the rightmost side of valve body 5. A "straight" groove is formed on the right end face of valve core 14. A hole g is formed on the middle section of valve core 14. The outer diameter of the push rod corresponding to hole g and the right end face is smaller than the outer diameter of the push rod corresponding to the left side of hole g. Hole g and the "straight" groove are connected through the cavity formed between valve core C and push rod C. The "straight" groove is connected to the cavity where the rightmost push rod is located. The outer diameters of the middle sections of the three valve cores are from left to right. The diameters of the valve cores decrease sequentially (the hollow part inside the valve body 5 is also a cylindrical stepped structure with the inner diameter decreasing from left to right). Each valve core has a small hole along the horizontal axis, and a push rod is inserted into each small hole. Both ends of the push rod protrude from the valve core. The right end of each of the three push rods is provided with a rod head. The outer diameter of the rod head is larger than the diameter of the small hole to prevent the push rod from sliding to the left. The left end of the pressure regulating spring 17 is installed at the right end of the rightmost push rod, and the right end of the pressure regulating spring 17 is installed in the inner hole of the adjusting screw 8.

[0027] The upper end face of valve seat 3 is provided with oil inlet port P3, port P1, port P2 and oil return port T, and the lower end face is provided with P k Mouth, P k The valve body 5 branches into three outlets within the valve seat 3. From left to right, the valve body 5 has radially penetrating holes a, b, c, d, e, and f. From left to right, the valve body 5 also has annular grooves on its outer circumference, each groove connecting to hole a, b, c, d, e, and f respectively. This allows oil to be guided into the outlets even if the valve body 5 is misaligned with the valve seat 3. Outlet P3 connects to hole a, outlet P1 to hole c, and outlet P2 to hole e. Holes b, d, and f connect to outlet P... kThe three branches of the port are connected; port T is connected to the cavity at the right end of top rod 15. In the initial state, holes a, c, and e are connected to the cavity at the left end of the valve core, holes b, d, and f are respectively abutted against the middle section of the valve core, and the three top rods abut against each other end to end. That is, the right end face of top rod 10 is close to the left end face of top rod 13, the right ball end face of top rod 13 is close to the left end face of top rod 15, and the left end face of valve core 11 abuts against the inner side of plug 1.

[0028] Among them, the valve seat 3 has ports P3, P1, P2, and P... k Both sides of the port and T-port are equipped with annular sealing rings 4 for sealing the oil. Annular sealing rings 6 are installed on the right side of holes a, b, c, d, e, and f on the valve body 5 for sealing the oil between different holes. The plug 1 is installed on the valve seat 3 by screws 9, restricting the axial movement of the valve body 5. The valve body 5 is also positioned and limited by its stepped outer circle against the valve seat 3. A left-end sealing ring 2 is installed between the plug 1 and the valve seat 3 to prevent oil leakage. A right-end sealing ring 16 is installed between the adjusting screw 8 and the inner wall of the valve seat 3 to prevent oil leakage from the return oil chamber. The adjusting screw 8 is secured by a lock nut 7.

[0029] The control method of the above-mentioned multi-stage pressure regulation and control device includes the following three states of graded control and regulation:

[0030] (1) As attached Figure 2 As shown, when the aircraft is in a low-pressure load flight state, oil is supplied to port P1, and P3 and P2 are both isolated. The high-pressure oil flows through hole c into the cavity formed by valve body 5, the right side of valve core 11 and A push rod 10, and the left side of valve core 12 and B push rod 13, acting on the left side of valve core 12 and B push rod 13 and the right side of valve core 11 and A push rod 10. When the oil pressure does not reach the set pressure P1, under the action of the pressure regulating spring 17, valve core 12 of B isolates hole c from hole d, and P... k The return oil is sequentially connected to port T via holes f, g, and T, and the hydraulic pump operates under pressure P1. When the oil pressure gradually reaches the set pressure P1, the hydraulic pressure overcomes the spring force of the pressure regulating spring 17, sequentially pushing valve core 12 B and its push rod C to the right. Hole c connects to hole d, while holes f, g, and T are disconnected (hole g is blocked by the large outer diameter of push rod C due to the rightward displacement of push rod C, and hole g is disconnected from the "I-shaped" groove). The return oil passage is broken, and the high-pressure oil flows through P... k The inlet enters the hydraulic pump swashplate variable mechanism follower chamber and pushes the swashplate to reduce its angle, thereby realizing the variable function of the hydraulic pump;

[0031] (2) As attached Figure 3As shown, when the aircraft is in a high-pressure load flight state, oil is supplied to port P2, and P3 and P1 are both isolated. The high-pressure oil flows through port e into the cavity formed by valve body 5, the right side of valve core 12 and B push rod 13, and the left side of valve core 14 and C push rod 15, acting on the valve cores and push rods on both sides. When the oil pressure does not reach the set pressure P2, under the action of the pressure regulating spring 17, the intermediate valve core isolates port e from port f, and P... k The return oil is sequentially connected to port f, port g, and port T, and the hydraulic pump operates under pressure P2. When the oil pressure gradually reaches the set pressure P2, the hydraulic pressure overcomes the elastic force of the pressure regulating spring 17, pushing valve core 14 and push rod 15 to the right. Port e connects to port f, while port f is disconnected from port g and port T (ports f and g are disconnected by the valve core surface, while port g and port T remain connected). The return oil passage is broken, and high-pressure oil flows through P... k The inlet enters the hydraulic pump swashplate variable mechanism follower chamber and pushes the swashplate to reduce its angle, thereby realizing the variable function of the hydraulic pump;

[0032] (3) As attached Figure 4 As shown, when the hydraulic pump starts, oil is supplied to port P3, and P1 and P2 are isolated. High-pressure oil flows through hole a into the cavity between the valve body 5, valve core A 11, and the left side of valve rod A 10 and the plug 1, acting on valve core A 11 and valve rod A 10. When the oil pressure does not reach the set pressure P3, under the action of the pressure regulating spring 17, the intermediate valve core isolates hole a from hole b, and P... k The return oil is sequentially connected to port F, port G, and port T for oil return, and the hydraulic pump operates under pressure P3. When the oil pressure gradually reaches the set pressure P3, the hydraulic pressure overcomes the elastic force of the pressure regulating spring 17, pushing valve core A 11 and push rods A 10, B 13, and C 15 to the right. Ports A and B are connected, while ports F and G are disconnected from port T (port G is disconnected from the "I-shaped" groove, similar to the situation when oil is flowing through port P1). The return oil passage is broken, and high-pressure oil flows through P... k The inlet enters the hydraulic pump swashplate variable mechanism follower chamber and pushes the swashplate to reduce its angle, thereby realizing the variable function of the hydraulic pump;

[0033] The pressure of the high-pressure oil is P3. <P1<P2。

[0034] 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 multi-stage pressure regulating control device for a hydraulic pump, characterized by, include: The multi-stage pressure regulating control device consists of a plug (1), a valve seat (3), a valve body (5), an adjusting screw (8), three valve cores, three push rods, and a pressure regulating spring (17). The left side of the device is sealed by the plug (1) installed on the valve seat (3), and the right side is sealed by the adjusting screw (8). The valve seat (3) and valve body (5) are hollow structures. The valve body (5) is installed in the valve seat (3), and the outer wall of the valve body (5) is tightly attached to the inner wall of the valve seat (3). The horizontal length of the valve body (5) is less than the horizontal length of the valve seat (3). The three valve cores are installed in the valve body (5) from left to right: the two valve cores on the left have a larger outer diameter in the middle section and smaller outer diameters at both ends; the right... The side valve core has a three-section structure with an increasing outer diameter from left to right. The outer side walls of the middle sections of the three valve cores are all in close contact with the inner side wall of the valve body (5). The left end face of the right end of the large outer diameter of the rightmost valve core abuts against the rightmost side of the valve body (5). The outer diameter of the middle sections of the three valve cores decreases from left to right. Each valve core has a small hole along the horizontal axial direction. A push rod is inserted into each small hole. The left end of the pressure regulating spring (17) is installed at the right end of the rightmost push rod, and the right end of the pressure regulating spring (17) is installed in the inner hole of the adjusting screw (8). The upper end face of the valve seat (3) is provided with oil inlet port P3, port P1, port P2 and oil return port T, and the lower end face is provided with P k Mouth, P k The valve seat (3) branches into three branches; the valve body (5) has radially penetrating holes a, b, c, d, e, and f sequentially from left to right. The P3 port is connected to hole a, the P1 port is connected to hole c, the P2 port is connected to hole e, and the holes b, d, and f are connected to P3 and P4 respectively. k The three branches of the port are connected; the T port is connected to the cavity where the rightmost push rod is located. In the initial state, holes a, c, and e are respectively connected to the cavities where the left ends of the three valve cores are located, and holes b, d, and f are respectively abutted against the middle sections of the three valve cores; a "one-line" groove is opened on the right end face of the rightmost valve core, and a hole g is opened on the middle section of the rightmost valve core. The outer diameter of the push rod corresponding to the right end face of hole g is smaller than the outer diameter of the push rod corresponding to the left side of hole g. Hole g and the "one-line" groove are connected through the cavity formed between the valve core and the push rod. The "one-line" groove is connected to the cavity where the rightmost push rod is located, and the three push rods abut against each other end to end.

2. A multi-stage pressure regulating control device for a hydraulic pump according to claim 1, wherein The valve body (5) has annular grooves on its outer circumference from left to right, and each annular groove is connected to holes a, b, c, d, e, and f respectively.

3. A multi-stage pressure regulating control device for a hydraulic pump according to claim 1, wherein The P3 port, the P1 port, the P2 port, the P k Both sides of the T port are provided with annular sealing rings (4).

4. A multi-stage pressure regulating control device for a hydraulic pump according to claim 1, wherein An annular sealing ring (6) is installed on the right side of holes a, b, c, d, e, and f on the valve body (5).

5. A multi-stage pressure regulating control device for a hydraulic pump according to claim 1, wherein The plug (1) contacts the valve seat (3), and a left-end sealing ring (2) is installed between the contact surfaces.

6. A multi-stage pressure regulating control device for a hydraulic pump according to claim 1, wherein A right-end sealing ring (16) is installed between the adjusting screw (8) and the inner wall of the valve seat (3).

7. A multi-stage pressure regulating control device for a hydraulic pump according to claim 1, wherein The outer circumference of the adjusting screw (8) is fixed by the locking nut (7).

8. A multi-stage pressure regulating control device for a hydraulic pump according to claim 1, wherein The plug (1) is installed on the valve seat (3) by screws (9).

9. A multi-stage pressure regulating control device for a hydraulic pump according to claim 1, wherein Each of the three push rods has a rod head on its right end, and the outer diameter of the rod head is larger than the inner diameter of the small hole through which the push rod passes.

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