Large-flow fast-response electro-hydraulic servo valve

Abstract

The utility model belongs to the technical field of hydraulic servo actuation, and discloses a large-flow fast-response electro-hydraulic servo valve which comprises a servo valve and an electromagnetic hydraulic lock, and an oil inlet is connected with an oil inlet of the servo valve through the electromagnetic hydraulic lock. And a pre-access is further arranged between the oil inlet and the oil inlet of the servo valve. Compared with a common electric servo valve, the large-flow quick-response electro-hydraulic servo valve has the advantages that a pre-channel is designed, and a small amount of hydraulic oil and pressure can be introduced into the servo valve before an electromagnetic hydraulic lock is opened; when large-flow hydraulic oil enters the servo valve, a valve element of the servo valve is located in the middle position, and a control signal can be quickly responded. Due to the fact that the process that the servo valve starts and returns to the middle is omitted, the response speed can be effectively increased, pressure pulsation can be effectively reduced, and the servo valve can be effectively suitable for large-load, large-flow, fast-response and high-reliability use scenes such as aerospace and ships and has important engineering application value.

Description

Technical Field

[0001] This utility model belongs to the field of hydraulic servo actuation technology, and relates to an electro-hydraulic servo valve, specifically a high-flow-rate, fast-response electro-hydraulic servo valve. Background Technology

[0002] Electro-hydraulic servo valves are used in the field of hydraulic servo actuation. As a key component for flow and pressure control in hydraulic systems, electro-hydraulic servo valves have advantages such as good dynamic response, high control accuracy, and long service life, and are widely used in fields requiring precise control, such as aviation, aerospace, shipbuilding, and chemical industries.

[0003] The flow rate and response characteristics of an electro-hydraulic servo valve directly affect the overall system performance. High flow rate requirements lead to changes in the valve sleeve of the servo valve, thus necessitating a larger valve core design. This increases the valve core's mass and degrades the servo valve's dynamic characteristics. In certain application scenarios requiring both high flow rate and rapid response, existing electro-hydraulic servo valves cannot meet the requirements; thus, high flow rate and rapid response become the conflict point for electro-hydraulic servo valves.

[0004] In addition, existing electro-hydraulic servo valves will exhibit obvious pulsation and jitter when faced with sudden large flow surges, which will have an adverse effect on the subsequent hydraulic system. Utility Model Content

[0005] To address the aforementioned issues, this invention provides a high-flow-rate, fast-response electro-hydraulic servo valve. This electro-hydraulic servo valve is suitable for high flow rates and high response, while also exhibiting low-pressure pulsation.

[0006] The technical solution of this utility model is as follows:

[0007] A high-flow-rate, fast-response electro-hydraulic servo valve includes a servo valve and an electromagnetic hydraulic lock. The oil inlet is connected to the oil inlet of the servo valve via the electromagnetic hydraulic lock. A pre-pass is provided between the oil inlet and the oil inlet of the servo valve.

[0008] Furthermore, the flow rate of the pre-pass is much smaller than that of the electromagnetic hydraulic lock; specifically, the flow rate of the pre-pass is no more than 10% of the flow rate of the electromagnetic hydraulic lock.

[0009] Furthermore, the pre-access path is located within the housing of the electromagnetic hydraulic lock.

[0010] Furthermore, the electromagnetic hydraulic lock includes an electromagnetic hydraulic lock housing and an electromagnetic hydraulic lock valve core. The electromagnetic hydraulic lock housing is provided with an electromagnetic hydraulic lock inlet port and an electromagnetic hydraulic lock servo valve port. The electromagnetic hydraulic lock inlet port and the electromagnetic hydraulic lock servo valve port are connected to the valve core cavity inside the electromagnetic hydraulic lock housing. The valve core cavity is also connected to the control flow channel. The electromagnetic hydraulic lock valve core is located inside the valve core cavity. When the electromagnetic hydraulic lock valve core is in the left extreme position, the electromagnetic hydraulic lock inlet port and the electromagnetic hydraulic lock servo valve port are blocked. When the electromagnetic hydraulic lock valve core is in the right extreme position, the electromagnetic hydraulic lock inlet port and the electromagnetic hydraulic lock servo valve port are connected. The electromagnetic hydraulic lock inlet port is always connected to the control flow channel.

[0011] Furthermore, a pre-connected passage is provided between the electromagnetic hydraulic lock housing and the electromagnetic hydraulic lock valve core.

[0012] Furthermore, the area of ​​the left end of the electromagnetic hydraulic lock valve core is smaller than that of the right end; one side of the control flow channel is connected to the left end of the valve core cavity, and the other side of the control flow channel is connected to the right end of the valve core cavity through the left oil circuit.

[0013] Furthermore, a piston is provided at the right end of the electromagnetic hydraulic lock valve core; the left side of the piston of the electromagnetic hydraulic lock valve core is connected to the electromagnetic hydraulic lock return oil interface, and the valve core cavity connected to the electromagnetic hydraulic lock return oil interface is the return oil chamber; the control flow channel is also connected to the return oil chamber through a switch structure and the right oil circuit.

[0014] The advantages of this utility model are:

[0015] This invention relates to a high-flow, fast-response electro-hydraulic servo valve. Compared to common electro-hydraulic servo valves, it features a pre-channel design that allows a small amount of hydraulic oil and pressure to be introduced into the servo valve before the electromagnetic hydraulic lock opens. This ensures that when the electromagnetic hydraulic lock opens and a large flow of hydraulic oil enters the servo valve, the valve core is in the center position, enabling rapid response to control signals. Because this invention eliminates the servo valve's start-up and return-to-center process, it effectively improves response speed and reduces pressure pulsation. It is well-suited for applications requiring high loads, high flow rates, fast response, and high reliability, such as aerospace and shipbuilding, and has significant engineering application value. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model patent, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model patent, and therefore should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a high-flow-rate, fast-response electro-hydraulic servo valve according to this utility model;

[0018] Figure 2 This is a schematic diagram of the integrated design of the pre-circuit passage and the electromagnetic hydraulic lock of this utility model;

[0019] Wherein: 1—Servo valve, 2—Pre-pass, 3—Inlet, 4—Electromagnetic hydraulic lock, 5—Return port, 6—Electromagnetic hydraulic lock inlet interface, 7—Electromagnetic hydraulic lock servo valve interface, 8—Electromagnetic hydraulic lock return interface, 9—Electromagnetic hydraulic lock valve core, 10—Electromagnetic hydraulic lock housing, 11—Electromagnet, 12—Steel ball, 13—Left side oil passage, 14—Right side oil passage, 15—Piston. Detailed Implementation

[0020] This section describes embodiments of the present invention, used to explain and illustrate the technical solutions of the present invention. Unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0021] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating directions or positional relationships, are based on the orientation or positional relationships in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They do not indicate or imply that the device or device referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include more than one of those features. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integrated connection; they can refer to a mechanical connection or a point connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] Example 1:

[0024] A high-flow-rate, fast-response electro-hydraulic servo valve includes a servo valve 1 and an electromagnetic hydraulic lock 4. The oil inlet 3 is connected to the oil inlet of the servo valve 1 through the electromagnetic hydraulic lock 4. A pre-passage 2 is also provided between the oil inlet 3 and the oil inlet of the servo valve 1.

[0025] Furthermore, the flow rate of the pre-passage 2 is much smaller than the flow rate of the electromagnetic hydraulic lock 4, specifically the flow rate of the pre-passage 2 is no more than 10% of the flow rate of the electromagnetic hydraulic lock 4.

[0026] The pre-passage 2 is located inside the housing of the electromagnetic hydraulic lock 4.

[0027] The electromagnetic hydraulic lock 4 includes an electromagnetic hydraulic lock housing 10 and an electromagnetic hydraulic lock valve core 9. The electromagnetic hydraulic lock housing 10 is provided with an electromagnetic hydraulic lock inlet port 6 and an electromagnetic hydraulic lock servo valve port 7. The electromagnetic hydraulic lock inlet port 6 and the electromagnetic hydraulic lock servo valve port 7 are connected to the valve core cavity inside the electromagnetic hydraulic lock housing 10. The valve core cavity is also connected to the control flow channel. The electromagnetic hydraulic lock valve core 9 is located inside the valve core cavity. When the electromagnetic hydraulic lock valve core 9 is in the left limit position, the electromagnetic hydraulic lock inlet port 6 and the electromagnetic hydraulic lock servo valve port 7 are blocked. When the electromagnetic hydraulic lock valve core 9 is in the right limit position, the electromagnetic hydraulic lock inlet port 6 and the electromagnetic hydraulic lock servo valve port 7 are connected. The electromagnetic hydraulic lock inlet port 6 is always connected to the control flow channel.

[0028] The pre-passage 2 is located between the electromagnetic hydraulic lock housing 10 and the electromagnetic hydraulic lock valve core 9.

[0029] The area of ​​the left end of the electromagnetic hydraulic lock valve core 9 is smaller than that of the right end; one side of the control flow channel is connected to the left end of the valve core cavity, and the other side of the control flow channel is connected to the right end of the valve core cavity through the left oil circuit 13.

[0030] The right end of the electromagnetic hydraulic lock valve core 9 is provided with a piston 15; the left side of the piston 15 of the electromagnetic hydraulic lock valve core 9 is connected to the electromagnetic hydraulic lock return oil interface 8, and the valve core cavity connected to the electromagnetic hydraulic lock return oil interface 8 is the return oil cavity; the control flow channel is also connected to the return oil cavity through the switch structure and the right oil circuit 14.

[0031] Example 2:

[0032] The following is combined with Figure 2 Further description of this utility model:

[0033] When electromagnet 11 does not receive a control signal, no electromagnetic force is generated. Under the pressure of the system oil inlet, steel ball 12 is pushed to the right. The oil pressure reaches the right end face of piston 15 through the left oil passage 13. Since the end face area of ​​piston 15 is larger than the end face area of ​​electromagnetic hydraulic lock valve core 9, the force to the left on piston 15 is greater than the force to the right on electromagnetic hydraulic lock valve core 9, causing electromagnetic hydraulic lock valve core 9 to move to the left. Electromagnetic hydraulic lock oil inlet port 6 and electromagnetic hydraulic lock servo valve port 7 cannot pass through a large flow of hydraulic oil.

[0034] A small amount of hydraulic oil can flow from the electromagnetic hydraulic lock inlet port 6 to the electromagnetic hydraulic lock servo valve port 7 through the pre-passage 3.

[0035] When electromagnet 11 receives a control signal, it generates electromagnetic force. Under the push of the electromagnetic force, steel ball 12 moves to the left, quickly closing the left oil circuit 13 and opening the right oil circuit 14. This connects the right end oil circuit of piston 15 with the return oil interface 8 of the electromagnetic hydraulic lock. The leftward force on piston 15 causes it to drop rapidly. Under the pressure at the left end, the electromagnetic hydraulic lock valve core 9 moves to the right, connecting the inlet oil interface 6 of the electromagnetic hydraulic lock with the servo valve interface 7 of the electromagnetic hydraulic lock, allowing a large amount of hydraulic oil to pass through and completing the unlocking action.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model, but the protection scope of this utility model is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this utility model, and these modifications or substitutions should be covered within the protection scope of this utility model.

Claims

1. A high-flow-rate, fast-response electro-hydraulic servo valve, characterized in that, It includes a servo valve (1) and an electromagnetic hydraulic lock (4). The oil inlet (3) is connected to the oil inlet of the servo valve (1) through the electromagnetic hydraulic lock (4). A pre-passage (2) is also provided between the oil inlet (3) and the oil inlet of the servo valve (1).

2. The high-flow-rate, fast-response electro-hydraulic servo valve according to claim 1, characterized in that, The flow rate of the pre-pass (2) is much smaller than that of the electromagnetic hydraulic lock (4). Specifically, the flow rate of the pre-pass (2) is no more than 10% of the flow rate of the electromagnetic hydraulic lock (4).

3. The high-flow-rate, fast-response electro-hydraulic servo valve according to claim 1, characterized in that, The pre-passage (2) is located inside the housing of the electromagnetic hydraulic lock (4).

4. The high-flow-rate, fast-response electro-hydraulic servo valve according to claim 3, characterized in that, The electromagnetic hydraulic lock (4) includes an electromagnetic hydraulic lock housing (10) and an electromagnetic hydraulic lock valve core (9). The electromagnetic hydraulic lock housing (10) is provided with an electromagnetic hydraulic lock oil inlet (6) and an electromagnetic hydraulic lock servo valve interface (7). The electromagnetic hydraulic lock oil inlet (6) and the electromagnetic hydraulic lock servo valve interface (7) are connected to the valve core cavity inside the electromagnetic hydraulic lock housing (10). The valve core cavity is also connected to the control flow channel. The electromagnetic hydraulic lock valve core (9) is located inside the valve core cavity. When the electromagnetic hydraulic lock valve core (9) is in the left limit position, the electromagnetic hydraulic lock oil inlet (6) and the electromagnetic hydraulic lock servo valve interface (7) are blocked. When the electromagnetic hydraulic lock valve core (9) is in the right limit position, the electromagnetic hydraulic lock oil inlet (6) and the electromagnetic hydraulic lock servo valve interface (7) are connected. The electromagnetic hydraulic lock oil inlet (6) is always connected to the control flow channel.

5. A high-flow-rate, fast-response electro-hydraulic servo valve according to claim 4, characterized in that, The pre-passage (2) is located between the electromagnetic hydraulic lock housing (10) and the electromagnetic hydraulic lock valve core (9).

6. A high-flow-rate, fast-response electro-hydraulic servo valve according to claim 4, characterized in that, The area of ​​the left end of the electromagnetic hydraulic lock valve core (9) is smaller than that of the right end; one side of the control flow channel is connected to the left end of the valve core cavity, and the other side of the control flow channel is connected to the right end of the valve core cavity through the left oil circuit (13).

7. A high-flow-rate, fast-response electro-hydraulic servo valve according to claim 6, characterized in that, The right end of the electromagnetic hydraulic lock valve core (9) is provided with a piston (15); the left side of the piston (15) of the electromagnetic hydraulic lock valve core (9) is connected to the electromagnetic hydraulic lock return oil interface (8), and the valve core cavity connected to the electromagnetic hydraulic lock return oil interface (8) is the return oil cavity; the control flow channel is also connected to the return oil cavity through the switch structure and the right oil circuit (14).

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