Electro-hydraulic servo valve

Abstract

The invention relates to the field of valves, in particular to an electro-hydraulic servo valve which comprises a shell, a valve body is fixedly connected to the interior of the shell, a valve sleeve is fixedly connected to the interior of the valve body, and a valve element is rotationally arranged in the valve sleeve; a driving assembly used for driving the valve element to rotate is arranged in the shell. A sensitive cavity and a high-pressure cavity are formed in the two ends of the valve element respectively, a penetrating groove communicated with the sensitive cavity is formed in the side wall of the valve sleeve, and an oil outlet groove used in cooperation with the penetrating groove is formed in the side portion of the valve element. The valve has the beneficial effects that the driving assembly only drives the valve element to rotate, then axial movement of the valve element depends on changes of hydraulic pressure in the sensitive cavity and hydraulic pressure in the high-pressure cavity, and the response speed of movement of the valve element is increased.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and in particular to an electro-hydraulic servo valve. Background Art

[0002] The electro-hydraulic servo valve is a control element that converts electrical signals into hydraulic signals. Its working principle is based on the principles of electromagnetism and fluid mechanics. When the electro-hydraulic servo valve receives an analog electrical signal, the electromagnet generates electromagnetic force to drive the valve core to move, thereby changing the valve opening and adjusting the flow and pressure in the hydraulic system. This adjustment method has the characteristics of high precision and fast response, making the electro-hydraulic servo valve widely used in industrial automation, aerospace, shipbuilding and other fields;

[0003] As a key component in the hydraulic servo system, the electro-hydraulic servo valve achieves precise regulation of flow and pressure in the hydraulic system by receiving analog electrical signals. However, the existing electro-hydraulic servo valve has deficiencies in hydraulic pressure adaptation, which to some extent limits the improvement of its response speed, thus affecting the performance of the entire hydraulic servo system.

[0004] Therefore, an electro-hydraulic servo valve is needed to overcome the above problems. Summary of the invention

[0005] In order to solve the above problems, an embodiment of the present invention provides an electro-hydraulic servo valve, which achieves the purpose of solving the problems raised in the background technology.

[0006] In order to achieve the above-mentioned purpose, the embodiment of the present invention specifically adopts the following technical scheme: an electro-hydraulic servo valve, comprising a housing, a valve body is fixedly connected to the interior of the housing, a valve sleeve is fixedly connected to the interior of the valve body, and a valve core is rotatably arranged inside the valve sleeve;

[0007] A driving assembly for driving the valve core to rotate is arranged inside the housing;

[0008] The two ends of the valve core are respectively provided with a sensitive cavity and a high-pressure cavity, the side wall of the valve sleeve is provided with a through groove connected with the sensitive cavity, and the side of the valve core is provided with an oil outlet groove used in conjunction with the through groove.

[0009] As a further improvement of the above technical solution:

[0010] The through groove is inclined, and the oil outlet groove is inclined. The inclination angle and direction of the through groove are the same as the inclination angle and direction of the oil outlet groove.

[0011] The valve body is provided with an oil inlet chamber, an oil return chamber, a first working chamber and a second working chamber inside.

[0012] The valve sleeve is provided with an oil inlet connected to the oil inlet chamber, an oil return port connected to the oil return chamber, a working port 1 connected to the working chamber 1, and a working port 2 connected to the working chamber 2.

[0013] A flow channel connected to the oil inlet chamber is arranged inside the valve core, one end of the flow channel is connected to the oil outlet groove, and the other end of the flow channel is connected to the high-pressure chamber.

[0014] The oil inlet chamber, the oil return chamber, the first working chamber and the second working chamber are all arranged in a circle.

[0015] The driving assembly comprises an armature fixedly connected to the valve core, a torque motor arranged inside the housing for driving the armature to rotate, and a vortex spring arranged on the armature.

[0016] A connecting piece is fixedly connected to the armature, and a displacement sensor for detecting the displacement of the connecting piece is arranged inside the shell.

[0017] The beneficial effects of the embodiments of the present invention are:

[0018] In the present application, the driving assembly only drives the valve core to rotate, and then the axial movement of the valve core depends on the changes in the liquid pressure inside the sensitive chamber and the liquid pressure inside the high-pressure chamber to improve the response speed of the valve core movement. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention;

[0020] Figure 2 is a cross-sectional schematic diagram of the present invention from a first viewing angle;

[0021] Figure 3 is a cross-sectional schematic diagram of the present invention from a second viewing angle;

[0022] Figure 4 It is a structural schematic diagram of the valve sleeve of the present invention;

[0023] Figure 5 It is a structural schematic diagram of the valve core of the present invention.

[0024] In the figure: 1, housing; 2, valve body; 3, valve sleeve; 4, valve core; 5, drive assembly; 6, sensitive chamber; 7, high-pressure chamber; 8, through groove; 9, flow channel; 10, oil outlet groove; 11, oil inlet chamber; 12, oil return chamber; 13, working chamber 1; 14, working chamber 2; 15, oil inlet port; 16, oil return port; 17, working port 1; 18, working port 2;

[0025] 51. Armature; 52. Torque motor; 53. Vortex spring; 54. Connector; 55. Displacement sensor. DETAILED DESCRIPTION

[0026] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0027] See also Figures 1 to 5 The embodiment of the present invention discloses an electro-hydraulic servo valve such as Figure 1 As shown, the electro-hydraulic servo valve of this embodiment comprises a housing 1, a valve body 2 is fixedly connected to the inside of the housing 1, a valve sleeve 3 is fixedly connected to the inside of the valve body 2, and a valve core 4 is rotatably arranged inside the valve sleeve 3;

[0028] A driving assembly 5 for driving the valve core 4 to rotate is arranged inside the housing 1;

[0029] The two ends of the valve core 4 are respectively provided with a sensitive cavity 6 and a high-pressure cavity 7, the side wall of the valve sleeve 3 is provided with a through groove 8 connected with the sensitive cavity 6, and the side of the valve core 4 is provided with an oil outlet groove 10 used in conjunction with the through groove 8;

[0030] In the initial state, the pressure oil enters the high-pressure chamber 7. In the initial state, the oil outlet groove 10 and the through groove 8 overlap a certain area, so that the pressure oil enters the sensitive chamber 6. Since the oil outlet groove 10 and the through groove 8 cause a certain resistance to the flow of the pressure oil, the pressure inside the sensitive chamber 6 is less than the pressure of the pressure oil, that is, the pressure inside the sensitive chamber 6 is less than the pressure inside the high-pressure chamber 7. However, since the force-bearing area of ​​the valve core 4 in the sensitive chamber 6 is larger than the force-bearing area of ​​the valve core 4 in the high-pressure chamber 7, the thrust of the sensitive chamber 6 on the valve core 4 is equal to the thrust of the high-pressure chamber 7 on the valve core 4, and then the force on the valve core 4 is balanced, that is, the valve core 4 does not move;

[0031] In the initial state, after the driving component 5 drives the valve core 4 to rotate a certain angle, the relative position of the oil outlet groove 10 and the through groove 8 changes, even if the overlap area of ​​the oil groove 10 and the through groove 8 increases, the oil outlet groove 10 and the through groove 8 reduce the flow resistance to the pressure oil, so that the pressure inside the sensitive chamber 6 increases, and then the valve core 4 moves axially toward one end of the high-pressure chamber 7. After the valve core 4 moves axially, the relative position of the oil outlet groove 10 and the through groove 8 changes again, even if the overlap area of ​​the oil groove 10 and the through groove 8 decreases, the oil outlet groove 10 and the through groove 8 increase the flow resistance to the pressure oil, so that the pressure inside the sensitive chamber 6 decreases, and the valve core 4 stops moving after the force is balanced, that is, the movement of the valve core 4 toward the high-pressure chamber 7 is realized;

[0032] In the initial state, after the driving component 5 drives the valve core 4 to rotate in the opposite direction by a certain angle, the relative position of the oil outlet groove 10 and the through groove 8 changes, even if the overlap area of ​​the oil groove 10 and the through groove 8 is reduced, the oil outlet groove 10 and the through groove 8 increase the flow resistance of the pressure oil, so that the pressure inside the sensitive chamber 6 is reduced, and then the valve core 4 moves axially toward one end of the sensitive chamber 6. After the valve core 4 moves axially, the relative position of the oil outlet groove 10 and the through groove 8 changes again, even if the overlap area of ​​the oil groove 10 and the through groove 8 is increased, the oil outlet groove 10 and the through groove 8 reduce the flow resistance of the pressure oil, so that the pressure inside the sensitive chamber 6 is increased, and the valve core 4 stops moving after the force is balanced, that is, the movement operation of the valve core 4 toward the sensitive chamber 6 is realized; the axial movement of the valve core 4 in different directions can realize the switching of the working position;

[0033] In the present application, the driving assembly 5 only drives the valve core 4 to rotate, and then the axial movement of the valve core 4 depends on the changes in the internal liquid pressure of the sensitive chamber 6 and the internal liquid pressure of the high-pressure chamber 7 to improve the response speed of the movement of the valve core 4.

[0034] As a further illustration of this application:

[0035] The through groove 8 is inclined, and the oil outlet groove 10 is inclined. The inclination angle and direction of the through groove 8 are the same as the inclination angle and direction of the oil outlet groove 10. The response speed of the liquid pressure change inside the sensitive cavity 6 is improved by setting the inclined through groove 8 and the oil outlet groove 10.

[0036] As a further illustration of this application:

[0037] The valve body 2 is provided with an oil inlet chamber 11, an oil return chamber 12, a working chamber 13 and a working chamber 2 14;

[0038] In the initial state, the pressure oil in the oil inlet chamber 11 enters the sensitive chamber 6 and the high-pressure chamber 7;

[0039] In the initial state, after the driving assembly 5 drives the valve core 4 to rotate a certain angle, the valve core 4 moves axially toward one end of the high-pressure chamber 7, and the pressure oil in the oil inlet chamber 11 enters the interior of the working chamber 1 13, and the pressure oil in the working chamber 2 14 enters the interior of the oil return chamber 12 for oil return;

[0040] In the initial state, after the driving component 5 drives the valve core 4 to rotate in the opposite direction by a certain angle, the valve core 4 moves axially toward one end of the sensitive chamber 6. At this time, the pressure oil in the oil inlet chamber 11 enters the interior of the working chamber 2 14, and the pressure oil in the working chamber 1 13 enters the interior of the oil return chamber 12 for oil return;

[0041] The relationship between the direct displacement of the valve core 4 and the rotation angle of the valve core 4 is expressed as follows:

[0042]

[0043] Wherein: d represents the diameter of the valve core 4, which is 8 mm; β represents the lead angle of the spiral groove; θ represents the rotation angle of the valve core 4, which is 0.6 degrees in combination with the design of the torque motor 52;

[0044] Combining the above formula, we can get: the valve core 4 stroke is 1.9mm, and the flow area gradient calculation value is 26.5mm 2 The helix angle design value is 2.5 degrees. When the oil pressure is 35Mpa and the opening volume is 0.95mm, the flow rate is 64.1L / min, which meets the requirements.

[0045] As a further illustration of this application:

[0046] The valve sleeve 3 is provided with an oil inlet 15 connected to the oil inlet chamber 11, an oil return port 16 connected to the oil return chamber 12, a working port 17 connected to the working chamber 1 13, and a working port 2 18 connected to the working chamber 2 14;

[0047] The oil inlet chamber 11, the oil return chamber 12, the working chamber 1 13 and the working chamber 2 14 are all arranged in a circle;

[0048] The valve sleeve 3 is installed inside the valve body 2 using a hot and cold assembly process. The valve body 2 is required to be heated to 400±5°C and kept warm for no less than 2 hours, and the valve sleeve 3 is kept in liquid nitrogen for no less than 10 minutes. The hot and cold assembly method mainly uses the stress generated by metal strain for sealing. The hot and cold assembly method will make the connection between the valve sleeve 3 and the valve body 2 very firm, while reducing the use of sealing rings when installing the valve sleeve 3, which greatly reduces the complexity of the structure.

[0049] By circumferentially arranging the oil inlet chamber 11, the oil return chamber 12, the working chamber 13 and the working chamber 2 14, when the valve sleeve 3 is installed inside the valve body 2, it is only necessary to ensure that the valve sleeve 3 and the valve body 2 are aligned in the axial direction; thus, the difficulty of installing the valve sleeve 3 inside the valve body 2 is reduced.

[0050] As a further illustration of this application:

[0051] The valve core 4 is provided with a flow channel 9 connected to the oil inlet chamber 11, one end of the flow channel 9 is connected to the oil outlet groove 10, and the other end of the flow channel 9 is connected to the high-pressure chamber 7, so that the pressure oil always enters the high-pressure chamber 7 and the sensitive chamber 6 through the flow channel 9;

[0052] That is, in the present application, the pressure oil for controlling the movement of the valve core 4 and the pressure oil used for operation are from the same oil source, which is convenient for practical use.

[0053] As a further illustration of this application:

[0054] The driving assembly 5 includes an armature 51 fixedly connected to the valve core 4, a torque motor 52 arranged inside the housing 1 for driving the armature 51 to rotate, and a vortex spring 53 arranged on the armature 51;

[0055] In the initial state, the torque motor 52 is not powered, the armature 51 is in the middle position, and the widths of the four working breaths are equal, so the magnetic resistance is equal, and the torque motor 52 does not deflect at this time; after the torque motor 52 is powered, due to the symmetry of the torque motor 52, the magnetic flux passing through the diagonal arms (i.e., the magnetic flux passing through the relative air gaps on the diagonal) is equal, and the magnetic flux of each air gap is superimposed by the control magnetic flux generated by the control coil and the constant magnetic flux of the permanent magnet. According to the principle of electromagnetism, the magnetic flux of one group of diagonal arms will be greater than the magnetic flux of another group of diagonal arms, and the armature 51 will deflect at this time. When the current signal is input, the magnetic circuit between the two pole shoes on the proportional electromagnet changes, causing the armature 51 to deflect, and the valve core 4 is fixed with the armature 51 and rotates with the armature.

[0056] As a further illustration of this application:

[0057] A connecting piece 54 is fixedly connected to the armature 51 , and a displacement sensor 55 for detecting the displacement of the connecting piece 54 is arranged inside the housing 1 . The displacement sensor 55 is used to limit the displacement of the valve core 4 to within ±3 mm.

[0058] It should be noted that in the description of the present invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0059] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0060] The term "comprise" or any other similar term is intended to cover a non-exclusive inclusion, such that a process, article, or apparatus / device that includes a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, article, or apparatus / device.

[0061] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. An electro-hydraulic servo valve, characterized in that: It comprises a housing (1), a valve body (2) is fixedly connected to the interior of the housing (1), a valve sleeve (3) is fixedly connected to the interior of the valve body (2), and a valve core (4) is rotatably arranged inside the valve sleeve (3); A driving assembly (5) for driving the valve core (4) to rotate is arranged inside the housing (1); The two ends of the valve core (4) are respectively provided with a sensitive cavity (6) and a high-pressure cavity (7); the side wall of the valve sleeve (3) is provided with a through groove (8) connected to the sensitive cavity (6); and the side of the valve core (4) is provided with an oil outlet groove (10) used in conjunction with the through groove (8).

2. The electro-hydraulic servo valve according to claim 1, characterized in that: The through groove (8) is arranged at an inclination, and the oil outlet groove (10) is arranged at an inclination, and the inclination angle and direction of the through groove (8) are the same as the inclination angle and direction of the oil outlet groove (10).

3. The electro-hydraulic servo valve according to claim 1, characterized in that: The valve body (2) is provided with an oil inlet chamber (11), an oil return chamber (12), a first working chamber (13) and a second working chamber (14) inside.

4. The electro-hydraulic servo valve according to claim 3, characterized in that: The valve sleeve (3) is provided with an oil inlet (15) connected to the oil inlet chamber (11), an oil return port (16) connected to the oil return chamber (12), a working port 1 (17) connected to the working chamber 1 (13), and a working port 2 (18) connected to the working chamber 2 (14).

5. The electro-hydraulic servo valve according to claim 4, characterized in that: The valve core (4) is provided with a flow channel (9) connected to the oil inlet chamber (11), one end of the flow channel (9) is connected to the oil outlet groove (10), and the other end of the flow channel (9) is connected to the high-pressure chamber (7).

6. The electro-hydraulic servo valve according to claim 3, characterized in that: The oil inlet chamber (11), the oil return chamber (12), the first working chamber (13) and the second working chamber (14) are all arranged in a circle.

7. The electro-hydraulic servo valve according to claim 1, characterized in that: The drive assembly (5) comprises an armature (51) fixedly connected to the valve core (4), a torque motor (52) arranged inside the housing (1) and used to drive the armature (51) to rotate, and a vortex spring (53) arranged on the armature (51).

8. The electro-hydraulic servo valve according to claim 7, characterized in that: A connecting piece (54) is fixedly connected to the armature (51), and a displacement sensor (55) for detecting the displacement of the connecting piece (54) is arranged inside the housing (1).

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