Control valve integrated electro-hydraulic actuator

Abstract

This invention relates to the field of control valve technology, and more particularly to an integrated electro-hydraulic actuator for control valves. The technical solution includes a pressure-reducing assembly comprising a guide arc plate, an iron block, an intermediate component, a path conversion disc, ball bearings, and a sliding rod. The end of the guide arc plate is fixedly connected to a square magnet. Multiple guide arc plates are arranged in a ring at equal angles. The iron block is slidably connected to the inner arc surface of the guide arc plate. The intermediate component is located at the bottom of the iron block. The bottom of the intermediate component is fixedly engaged with the path conversion disc. The inner ring of the path conversion disc is rotatably connected to the ball bearings, and the inner ring of the path conversion disc is slidably connected to the sliding rod. When there is no magnetic force on the coil, the hydraulic pressure in the hydraulic oil pipe increases. At this time, the ball bearings enter the elongated sliding groove, and the piston slides upward within the circular groove of the passage, reducing the pressure in the hydraulic oil pipe and preventing excessive hydraulic pressure from deteriorating the sealing effect.

Description

Technical Field

[0001] This invention relates to the field of control valve technology, and more particularly to an integrated electro-hydraulic actuator for control valves. Background Technology

[0002] An integrated electro-hydraulic actuator is a device that integrates a control valve and an electro-hydraulic actuator into one unit. This type of actuator typically consists of an electro-hydraulic servo valve, a hydraulic actuator, and a control system, used to control fluid flow in hydraulic and pneumatic systems. This integrated electro-hydraulic actuator design offers several advantages, including compactness, high efficiency, and ease of installation and maintenance. Because the entire system is integrated, the risk of piping connections and leaks is reduced, and the system's response speed and accuracy are improved. Furthermore, integrated electro-hydraulic actuators typically have advanced control functions, enabling complex motion control and automation tasks.

[0003] Application number CN202211230754.7 proposes an oil leakage prevention device for an electro-hydraulic servo valve. Two horizontal rotating rods drive two rotating plates to rotate, so that two fixing holes and two fixing pins are on the same horizontal line. When the sealing tube is loosened, two first springs are released, which drives two circular plates to move. The two circular plates drive two pins to move, so that the two rotating plates are fitted onto the two fixing pins, thereby achieving the purpose of reinforcement and preventing oil leakage.

[0004] However, when this type of electro-hydraulic servo valve is in use, the hydraulic oil inside works in a high-temperature environment. The increase in hydraulic oil temperature will cause the hydraulic oil to expand, which will increase the pressure inside the electro-hydraulic servo valve, causing the hydraulic system to malfunction. The increased pressure on the seals inside the electro-hydraulic servo valve will lead to a deterioration in the sealing effect of the electro-hydraulic servo valve. Summary of the Invention

[0005] The purpose of this invention is to address the problem in the prior art where the increased pressure on the seals due to the thermal expansion of hydraulic oil leads to a deterioration in the sealing effect, and to propose an integrated electro-hydraulic actuator for the control valve.

[0006] The technical solution of the present invention: an integrated electro-hydraulic actuator for control valves, comprising:

[0007] An integrated electro-hydraulic actuator for control valves, characterized in that it comprises:

[0008] A power stage main valve, wherein a pilot stage valve is fixedly installed on the top of the power stage main valve, a square magnet is fixedly installed inside the pilot stage valve, and symmetrically arranged coils are fixedly installed on the inner frame of the square magnet. A power interface is fixedly installed on the side of the pilot stage valve, and the power interface is connected to the coils through wires.

[0009] A voltage reduction assembly includes a guide arc plate, an iron block, an intermediate component, a path conversion disk, ball bearings, and a slide rod. The end of the guide arc plate is fixedly connected to a square magnet. Multiple guide arc plates are arranged in a ring at equal angles. The iron block is slidably connected to the inner arc surface of the guide arc plate. An intermediate component is provided at the bottom of the iron block. The bottom of the intermediate component is fixedly engaged with the path conversion disk. The inner ring of the path conversion disk is rotatably connected to the ball bearings. The inner ring of the path conversion disk is slidably connected to the slide rod. A contact switch is fixedly installed on the top of the slide rod.

[0010] The slide bar has an annular groove and a long groove on its shaft. The long groove is perpendicular to the annular groove, and the ball rolls in the annular groove and the long groove.

[0011] A hydraulic oil pipe is fixedly installed inside the power stage main valve. A circular groove communicating with the hydraulic oil pipe is opened inside the power stage main valve. A piston is fixedly installed at the bottom of the slide rod. The piston slides in the circular groove. Circular openings are opened on both sides of the square magnet. The iron block is located on the extension line of the line connecting the coil and the circular opening.

[0012] A sealing assembly is provided at the middle of the two coils, and a positioning assembly is provided inside the power stage main valve and on both sides of the slide bar.

[0013] Optionally, the annular slide groove is provided in multiple layers, and multiple annular slide grooves are connected by long slide grooves. The ball bearing is located at the long slide groove, and the slide rod slides up and down inside the path conversion disk. The ball bearing is located at the annular slide groove, and the slide rod is fixed in position inside the path conversion disk.

[0014] Optionally, a positioning sleeve is fixedly installed on the top of the power stage main valve, and a path conversion disc is rotatably connected to the top of the positioning sleeve. A guide groove is opened on the inner ring of the positioning sleeve, and symmetrically arranged guide protrusions are fixedly installed on the rod body of the slide rod. The guide protrusions slide in the guide groove of the positioning sleeve.

[0015] Optionally, when the coil is energized and generates magnetic force, the iron block moves toward the coil, the path conversion disk rotates, the ball enters the annular groove, and the piston is fixed in position within the passageway groove; when the coil is not energized, the position of the iron block remains unchanged, the ball is located in the elongated groove, and the piston slides within the passageway groove.

[0016] Optionally, the intermediate component includes a connecting plate and a toothed plate. The connecting plate passes through the gap between multiple guide arc plates and its top is fixedly connected to an iron block. The bottom of the connecting plate is fixedly connected to the toothed plate. The toothed plate slides on top of the power stage main valve and is engaged with a path conversion disc.

[0017] Optionally, a circular plate is fixedly connected to the end of the guide arc plate away from the square magnet. The circular plate is elastically connected to the iron block through a reset spring, and an insulating sheet is fixedly installed at the connection between the circular plate and the iron block.

[0018] Optionally, the positioning component includes a first pressing block, a second pressing block, and a helical spring. The first pressing blocks are fixedly installed on both sides of the slide rod and are symmetrically arranged. The first pressing blocks are engaged with the second pressing blocks. The power stage main valve has a clearance cavity inside. The inner wall of the power stage main valve is elastically connected to the second pressing block through the helical spring.

[0019] Optionally, both the first extrusion block and the second extrusion block adopt a wedge-shaped structure. The inclined surface of the first extrusion block and the inclined surface of the second extrusion block are in contact with each other. A partition is provided on the inner wall of the power stage main valve and in the relief cavity. The second extrusion block slides on the partition. Multiple second extrusion blocks are provided and are distributed at equal intervals along the vertical line. The distance between two adjacent second extrusion blocks is the same as the distance between two adjacent annular grooves.

[0020] Optionally, the sealing assembly includes an armature, an upper sealing sleeve, a lower sealing sleeve, and a convex ring sealing sleeve. The upper sealing sleeve is fixedly installed on the shaft of the armature. The upper sealing sleeve has a trumpet-shaped structure. The bottom of the upper sealing sleeve is fixedly connected to the power stage main valve. The lower sealing sleeve is fixedly installed on the inner arc surface of the upper sealing sleeve. A convex ring sealing sleeve is provided in the middle of the lower sealing sleeve. A concave ring groove is provided on the inner wall of the power stage main valve. The convex ring sealing sleeve is embedded in the concave ring groove. The armature is located between the two coils.

[0021] Optionally, a hydraulic oil nozzle is fixedly installed at the end of the hydraulic oil pipe, and a feedback rod is fixedly installed at the bottom of the armature. Two hydraulic oil nozzles are provided and symmetrically distributed around the feedback rod. A main valve core is fixedly installed at the bottom of the feedback rod. A valve core switching chamber is opened inside the power stage main valve, and the main valve core slides left and right in the valve core switching chamber.

[0022] Compared with the prior art, the present invention has the following beneficial technical effects:

[0023] This invention utilizes the magnetic force generated by energizing the coil to lock the piston position by having the ball enter the annular groove. This means that when the electro-hydraulic actuator controls the flow and direction of gas or liquid, changes in the internal pressure of the hydraulic pipe do not affect the hydraulic pressure within the pipe. Conversely, when there is no magnetic force on the coil, the hydraulic pressure increases, causing the ball to enter the elongated groove. The piston then slides upwards within the circular groove, reducing the pressure within the hydraulic pipe and preventing excessive pressure that could compromise the sealing effect and thus the flow control accuracy.

[0024] Furthermore, the hydraulic pressure in the hydraulic oil pipe increases. At this time, the first extrusion block moves upward from the second extrusion block. Since the distance between two adjacent second extrusion blocks is the same as the distance between two adjacent annular grooves, the ball also moves upward from the annular groove, so that the ball is always at the same horizontal plane as an annular groove. Therefore, when the coil generates a change in magnetic force, the ball can always enter the annular groove to limit the slide rod.

[0025] Furthermore, the hydraulic oil sprayed from the hydraulic oil nozzle causes the convex ring seal sleeve to fit into the concave ring groove, reducing the gap. Even if hydraulic oil enters the convex ring seal sleeve and the concave ring groove, the hydraulic oil moves slowly in the gap due to the compression of the convex ring seal sleeve. Moreover, the hydraulic oil remains between the convex ring seal sleeve and the concave ring groove for a long time, and the hydraulic oil solidifies, further preventing hydraulic oil from seeping out from the upper seal sleeve and improving the sealing effect. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the overall structure of one embodiment of the present invention;

[0027] Figure 2 A cross-sectional schematic diagram of the pilot stage valve structure according to an embodiment of the present invention is provided;

[0028] Figure 3 A schematic diagram of a rectangular magnet structure according to an embodiment of the present invention is provided;

[0029] Figure 4 A schematic diagram of an iron block structure according to an embodiment of the present invention is provided;

[0030] Figure 5 A schematic diagram of a path conversion disk structure according to an embodiment of the present invention is provided;

[0031] Figure 6 A schematic diagram of the valve core switching cavity structure according to an embodiment of the present invention is provided;

[0032] Figure 7 Give Figure 6 Enlarged schematic diagram of the feedback rod structure in part A;

[0033] Figure 8 A partial sectional view of the power stage main valve structure according to an embodiment of the present invention is provided.

[0034] Figure 9 Give Figure 8 Enlarged schematic diagram of the first extrusion block structure in part B.

[0035] Reference numerals: 1. Power stage main valve; 2. Pilot stage valve; 3. Power interface; 4. Square magnet; 5. Coil; 6. Voltage reduction assembly; 61. Guide arc plate; 62. Circular plate; 63. Iron block; 64. Return spring; 65. Connecting plate; 66. Toothed plate; 67. Path conversion disc; 68. Positioning sleeve; 69. Ball bearing; 610. Slide rod; 611. Annular groove; 612. Long strip groove; 613. Guide ridge; 614. Piston; 6 15. Passage groove; 616. Contact switch; 7. Sealing assembly; 71. Hydraulic oil nozzle; 72. Armature; 73. Feedback rod; 74. Upper sealing sleeve; 75. Lower sealing sleeve; 76. Convex ring sealing sleeve; 77. Concave ring groove; 78. Main valve core; 8. Valve core switching chamber; 9. Hydraulic oil pipe; 10. Positioning assembly; 101. First extrusion block; 102. Partition plate; 103. Second extrusion block; 104. Helical spring; 105. Relief chamber. Detailed Implementation

[0036] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments.

[0037] The components of the embodiments of the invention described and shown in the accompanying drawings can typically be arranged and designed in a variety of different configurations. Therefore, the following detailed description of the embodiments of the invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention.

[0038] Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0040] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical 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 invention based on the specific circumstances.

[0041] Example 1

[0042] This embodiment proposes an integrated electro-hydraulic actuator for control valves, such as... Figure 1 and 2 As shown, the system includes a power stage main valve 1, a pilot stage valve 2 fixedly mounted on top of the power stage main valve 1, a square magnet 4 fixedly mounted inside the pilot stage valve 2, and symmetrically arranged coils 5 fixedly mounted on the inner frame of the square magnet 4. A power interface 3 is fixedly mounted on the side of the pilot stage valve 2, and the power interface 3 is connected to the coils 5 via wires. A sealing assembly 7 is provided between the two coils 5. Power is supplied to the coils 5 through the power interface 3, thereby activating the electro-hydraulic actuator. By providing electrical energy to the coils 5, the sealing assembly 7 is displaced, thus changing the flow rate and direction of the liquid or gas.

[0043] like Figure 3-5 As shown, both sides of the square magnet 4 are provided with voltage reduction components 6. The voltage reduction components 6 include a guide arc plate 61, an iron block 63, an intermediate component, a path conversion disk 67, a ball bearing 69, and a slide rod 610. The end of the guide arc plate 61 is fixedly connected to the square magnet 4. Multiple guide arc plates 61 are provided and distributed in a ring at equal angles. The iron block 63 is slidably connected to the inner arc surface of the guide arc plate 61. An intermediate component is provided at the bottom of the iron block 63. The bottom of the intermediate component is fixedly engaged with the path conversion disk 67. The inner ring of the path conversion disk 67 is rotatably connected to the ball bearing 69. The inner ring of the path conversion disk 67 is slidably connected to the slide rod 610. The top of the slide rod 610 is fixedly installed with a contact switch 616.

[0044] The square magnet 4 has round openings on both sides. The iron block 63 is located on the extension line of the coil 5 and the round opening. The coil 5 generates magnetic force when energized, and the coil 5 attracts the round plate 62. The guide arc plate 61 guides the iron block 63 to avoid deviation. The iron block 63 moves and uses the intermediate part to drive the path conversion disk 67 to rotate, thereby changing the state of the inner ring slide rod 610 of the path conversion disk 67.

[0045] like Figure 5As shown, the slide bar 610 has an annular groove 611 and a long groove 612 on its shaft. The long groove 612 is perpendicular to the annular groove 611. The ball bearing 69 rolls within the annular groove 611 and the long groove 612. The annular groove 611 has multiple layers, and the multiple annular grooves 611 are connected by the long groove 612. When the path conversion disk 67 is stationary, the ball bearing 69 is located at the long groove 612, and the slide bar 610 slides up and down inside the path conversion disk 67. When the path conversion disk 67 is stationary, the ball bearing 69 is located at the annular groove 611, and the slide bar 610 is fixed in position within the path conversion disk 67.

[0046] like Figure 8 As shown, a hydraulic oil pipe 9 is fixedly installed inside the power stage main valve 1. A circular groove 615 communicating with the hydraulic oil pipe 9 is opened inside the power stage main valve 1. A piston 614 is fixedly installed at the bottom of the slide rod 610, and the piston 614 slides within the circular groove 615. The pressure at the valve core switching chamber 8 is reduced by the movement of the piston 614 within the circular groove 615.

[0047] When coil 5 is energized and generates magnetic force, iron block 63 moves towards coil 5, path conversion disk 67 rotates, ball 69 enters annular groove 611, and piston 614 is fixed in position within passage groove 615. When coil 5 is not energized, iron block 63 remains in position, ball 69 is located in elongated groove 612, and piston 614 slides within passage groove 615. That is, during electro-hydraulic actuation, the change in magnetic force of coil 5 alters the position of sealing assembly 7, causing pressure changes within power stage main valve 1. At this time, ball 69 enters annular groove 611, preventing piston 614 from moving. Since coil 5 is not energized, the pressure change within power stage main valve 1 is not due to electro-hydraulic actuation. Ball 69, located in elongated groove 612, moves along elongated groove 612 under pressure, meaning piston 614 moves within passage groove 615, thus reducing pressure within the electro-hydraulic actuator.

[0048] like Figure 4 and 8 As shown, a positioning sleeve 68 is fixedly installed on the top of the power stage main valve 1. The top of the positioning sleeve 68 is rotatably connected to a path conversion disc 67. A guide groove is formed on the inner ring of the positioning sleeve 68. Symmetrically arranged guide protrusions 613 are fixedly installed on the rod body of the slide rod 610. The guide protrusions 613 slide within the guide groove of the positioning sleeve 68. The guide protrusions 613 and the guide groove cooperate to prevent the slide rod 610 from rotating, and to prevent the ball 69 from moving synchronously with the slide rod 610 when it enters the annular groove 611.

[0049] like Figure 4As shown, the intermediate component includes a connecting plate 65 and a toothed plate 66. The connecting plate 65 passes through the gaps between multiple guide arc plates 61 and its top is fixedly connected to the iron block 63. The bottom of the connecting plate 65 is fixedly connected to the toothed plate 66. The toothed plate 66 slides on top of the power stage main valve 1 and engages with the path conversion disc 67. The movement of the iron block 63 drives the toothed plate 66, causing the path conversion disc 67 to rotate. The magnetic force generated by one of the two coils 5 will cause the path conversion disc 67 to rotate. That is, the path conversion disc 67 rotates when the flow rate and direction of the liquid or gas change.

[0050] Contact switch 616 is electrically connected to the alarm. When contact switch 616 moves upward and contacts path switching plate 67, meaning piston 614 can no longer move upward, the pressure in hydraulic oil pipe 9 needs to be addressed promptly, and the alarm will alert the operator to take immediate action.

[0051] In this embodiment, when the coil 5 is energized and generates magnetic force, the ball 69 enters the annular groove 611, so that the piston 614 is fixed in the circular groove 615 and cannot move up or down. That is, when the electro-hydraulic actuator controls the flow and direction of gas or liquid, the hydraulic pressure in the hydraulic oil pipe 9 changes, but the position of the piston 614 remains unchanged. However, when there is no magnetic force on the coil 5, the hydraulic pressure in the hydraulic oil pipe 9 increases. At this time, the ball 69 enters the elongated groove 612, and the piston 614 slides upward in the circular groove 615, reducing the pressure in the hydraulic oil pipe 9. This prevents the hydraulic pressure in the hydraulic oil pipe 9 from becoming too high, which would lead to a poor sealing effect and thus a decrease in the accuracy of flow control.

[0052] Example 2

[0053] Based on Example 1, this example proposes an integrated electro-hydraulic actuator for the control valve, such as... Figure 8 and 9 As shown, the positioning assembly 10 includes a first pressing block 101, a second pressing block 103, and a helical spring 104. The first pressing blocks 101 are symmetrically arranged and fixedly mounted on both sides of the slide rod 610. The first pressing blocks 101 and the second pressing blocks 103 are engaged. A clearance cavity 105 is provided inside the power stage main valve 1. The inner wall of the power stage main valve 1 is elastically connected to the second pressing block 103 via the helical spring 104. The second pressing block 103 limits the first pressing block 101, thus limiting the slide rod 610. When the piston 614 moves upward, the slide rod 610 drives the first pressing block 101 upward, and the first pressing block 101 presses the second pressing block 103 and compresses the helical spring 104. At this time, the first pressing block 101 moves upward one level.

[0054] like Figure 9As shown, multiple second extrusion blocks 103 are arranged and equidistantly along a vertical line. The distance between two adjacent second extrusion blocks 103 is the same as the distance between two adjacent annular grooves 611. When the first extrusion block 101 moves up one layer, the annular groove 611 on the slide rod 610 also moves upward. Initially, the ball 69 is on the same horizontal plane as the uppermost annular groove 611. At this time, the ball 69 is on the same horizontal plane as the lower annular groove 611. By using multiple second extrusion blocks 103 corresponding to the annular grooves 611, when the first extrusion block 101 rises one layer, the annular groove 611 rises one layer, so that the ball 69 is always on the same horizontal plane as one annular groove 611.

[0055] Both the first extrusion block 101 and the second extrusion block 103 adopt a wedge-shaped structure. The inclined surface of the first extrusion block 101 is in contact with the inclined surface of the second extrusion block 103. A partition 102 is provided on the inner wall of the power stage main valve 1 at the relief cavity 105. The partition 102 guides the second extrusion block 103, and the second extrusion block 103 slides at the partition 102.

[0056] In this embodiment, the hydraulic pressure in the hydraulic oil pipe 9 increases. At this time, the first extrusion block 101 moves upward from the second extrusion block 103. Since the distance between two adjacent second extrusion blocks 103 is the same as the distance between two adjacent annular grooves 611, the ball 69 also moves upward from the annular groove 611, so that the ball 69 is always at the same horizontal plane as an annular groove 611. Therefore, when the coil 5 generates a change in magnetic force, the ball 69 can always enter the annular groove 611 to limit the slide rod 610.

[0057] Example 3

[0058] Based on Embodiment 1 or 2 above, this embodiment proposes an integrated electro-hydraulic actuator for control valves, such as... Figure 7 As shown, the sealing assembly 7 includes an armature 72, an upper sealing sleeve 74, a lower sealing sleeve 75, and a convex ring sealing sleeve 76. The upper sealing sleeve 74 is fixedly installed on the rod of the armature 72. The upper sealing sleeve 74 has a trumpet-shaped structure. The bottom of the upper sealing sleeve 74 is fixedly connected to the power stage main valve 1. The lower sealing sleeve 75 is fixedly installed on the inner arc surface of the upper sealing sleeve 74. The convex ring sealing sleeve 76 is provided in the middle of the lower sealing sleeve 75. The inner wall of the power stage main valve 1 is provided with a concave ring groove 77. The convex ring sealing sleeve 76 is embedded in the concave ring groove 77. The armature 72 is located between the two coils 5. The hydraulic oil nozzle 71 is fixedly installed at the end of the hydraulic oil pipe 9.

[0059] The magnetic force generated by coil 5 causes armature 72 to deflect, and hydraulic oil nozzle 71 at the end of hydraulic oil pipe 9 sprays hydraulic oil to assist the deflection. There is a gap at the deflection point of armature 72. The upper sealing sleeve 74 at the armature 72 rod body isolates the connection between the power stage main valve 1 and the pilot stage valve 2, reducing the gap. At the same time, the hydraulic oil spraying causes the convex ring sealing sleeve 76 to fit against the concave ring groove 77, reducing the gap. Even if hydraulic oil enters the convex ring sealing sleeve 76 and the concave ring groove 77, the hydraulic oil moves slowly at the gap due to the compression of the convex ring sealing sleeve 76. The hydraulic oil remains between the convex ring sealing sleeve 76 and the concave ring groove 77 for a long time, and the hydraulic oil solidifies.

[0060] like Figure 6 and 7 As shown, a feedback rod 73 is fixedly mounted on the bottom of the armature 72. Two hydraulic oil nozzles 71 are provided and symmetrically distributed around the feedback rod 73. A main valve core 78 is fixedly mounted on the bottom of the feedback rod 73. A valve core switching chamber 8 is opened inside the power stage main valve 1, and the main valve core 78 slides left and right within the valve core switching chamber 8. By deflecting the armature 72 and changing the position of the main valve core 78 using the feedback rod 73, the flow rate and direction of the liquid or gas can be changed.

[0061] In this embodiment, the hydraulic oil sprayed from the hydraulic oil nozzle 71 causes the convex ring seal sleeve 76 to fit against the concave ring groove 77, reducing the gap. Even if hydraulic oil enters the convex ring seal sleeve 76 and the concave ring groove 77, the hydraulic oil moves slowly in the gap due to the compression of the convex ring seal sleeve 76. Furthermore, the hydraulic oil remains between the convex ring seal sleeve 76 and the concave ring groove 77 for a long time, causing the hydraulic oil to solidify. This further prevents the hydraulic oil from seeping out from the upper seal sleeve 74, thus improving the sealing effect.

[0062] The above specific embodiments are merely several optional embodiments of the present invention. Based on the technical solutions of the present invention and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. An integrated electro-hydraulic actuator for control valves, characterized in that, include: A power stage main valve (1) is provided, and a pilot stage valve (2) is fixedly installed on the top of the power stage main valve (1). A square magnet (4) is fixedly installed inside the pilot stage valve (2). A symmetrically arranged coil (5) is fixedly installed on the inner frame of the square magnet (4). A power interface (3) is fixedly installed on the side of the pilot stage valve (2). The power interface (3) is connected to the coil (5) by a wire. The step-down assembly (6) includes a guide arc plate (61), an iron block (63), an intermediate component, a path conversion disk (67), a ball bearing (69), and a slide rod (610). The end of the guide arc plate (61) is fixedly connected to the square magnet (4). Multiple guide arc plates (61) are provided and distributed in a ring at equal angles. The iron block (63) is slidably connected to the inner arc surface of the guide arc plate (61). An intermediate component is provided at the bottom of the iron block (63). The bottom of the intermediate component is engaged with the path conversion disk (67). The inner ring of the path conversion disk (67) is rotatably connected to the ball bearing (69). The inner ring of the path conversion disk (67) is slidably connected to the slide rod (610). A contact switch (616) is fixedly installed on the top of the slide rod (610). The slide bar (610) has an annular groove (611) and a long groove (612) on its shaft. The long groove (612) is perpendicular to the annular groove (611). The ball (69) rolls in the annular groove (611) and the long groove (612). The power stage main valve (1) is internally fixedly equipped with a hydraulic oil pipe (9), and the power stage main valve (1) is internally provided with a passage groove (615) that communicates with the hydraulic oil pipe (9). The bottom of the slide rod (610) is fixedly equipped with a piston (614), and the piston (614) slides in the passage groove (615). The square magnet (4) is provided with round openings on both sides, and the iron block (63) is located on the extension line of the line connecting the coil (5) and the round opening. A sealing assembly (7) is provided at the middle of the two coils (5), and a positioning assembly (10) is provided inside the power stage main valve (1) and on both sides of the slide bar (610).

2. The integrated electro-hydraulic actuator for control valves according to claim 1, characterized in that: The annular groove (611) is provided in multiple layers, and multiple annular grooves (611) are connected by long grooves (612). The ball (69) is located at the long groove (612), and the slide rod (610) slides up and down inside the path conversion disk (67). The ball (69) is located at the annular groove (611), and the slide rod (610) is fixed in position inside the path conversion disk (67).

3. The integrated electro-hydraulic actuator for control valves according to claim 1, characterized in that: A positioning sleeve (68) is fixedly installed on the top of the power stage main valve (1). The top of the positioning sleeve (68) is rotatably connected to the path conversion disk (67). A guide groove is opened on the inner ring of the positioning sleeve (68). A symmetrically arranged guide protrusion (613) is fixedly installed on the rod body of the slide rod (610). The guide protrusion (613) slides in the guide groove of the positioning sleeve (68).

4. The integrated electro-hydraulic actuator for control valves according to claim 1, characterized in that: When the coil (5) is energized and generates magnetic force, the iron block (63) moves toward the coil (5), the path conversion disk (67) rotates, the ball (69) enters the annular groove (611), and the piston (614) is fixed in the passage circular groove (615); when the coil (5) is not energized, the position of the iron block (63) remains unchanged, the ball (69) is located in the long strip groove (612), and the piston (614) slides in the passage circular groove (615).

5. The integrated electro-hydraulic actuator for control valves according to claim 1, characterized in that: The intermediate component includes a connecting plate (65) and a toothed plate (66). The connecting plate (65) passes through the gaps between multiple guide arc plates (61) and its top is fixedly connected to an iron block (63). The bottom of the connecting plate (65) is fixedly connected to the toothed plate (66). The toothed plate (66) slides on top of the power stage main valve (1) and is engaged with a path conversion disc (67).

6. The integrated electro-hydraulic actuator for control valves according to claim 1, characterized in that: The guide arc plate (61) is fixedly connected to a circular plate (62) at one end away from the square frame magnet (4). The circular plate (62) is elastically connected to the iron block (63) by a reset spring (64). An insulating sheet is fixedly installed at the connection between the circular plate (62) and the iron block (63).

7. The integrated electro-hydraulic actuator for control valves according to claim 1, characterized in that: The positioning component (10) includes a first pressing block (101), a second pressing block (103), and a helical spring (104). The first pressing blocks (101) are fixedly installed on both sides of the slide rod (610) and are symmetrically arranged. The first pressing block (101) and the second pressing block (103) are engaged. The power stage main valve (1) has a relief cavity (105) inside. The inner wall of the power stage main valve (1) is elastically connected to the second pressing block (103) through the helical spring (104).

8. The integrated electro-hydraulic actuator for control valves according to claim 7, characterized in that: The first extrusion block (101) and the second extrusion block (103) both adopt a wedge structure. The inclined surface of the first extrusion block (101) is in contact with the inclined surface of the second extrusion block (103). A partition (102) is provided on the inner wall of the power stage main valve (1) and located in the relief cavity (105). The second extrusion block (103) slides on the partition (102). Multiple second extrusion blocks (103) are provided and are distributed at equal intervals along the vertical line. The distance between two adjacent second extrusion blocks (103) is the same as the distance between two adjacent annular grooves (611).

9. The integrated electro-hydraulic actuator for control valves according to claim 1, characterized in that: The sealing assembly (7) includes an armature (72), an upper sealing sleeve (74), a lower sealing sleeve (75), and a convex ring sealing sleeve (76). The upper sealing sleeve (74) is fixedly installed on the rod of the armature (72). The upper sealing sleeve (74) adopts a trumpet-shaped structure. The bottom of the upper sealing sleeve (74) is fixedly connected to the power stage main valve (1). The lower sealing sleeve (75) is fixedly installed on the inner arc surface of the upper sealing sleeve (74). The convex ring sealing sleeve (76) is provided in the middle of the lower sealing sleeve (75). The inner wall of the power stage main valve (1) is provided with a concave ring groove (77). The convex ring sealing sleeve (76) is embedded in the concave ring groove (77). The armature (72) is located between the two coils (5).

10. The integrated electro-hydraulic actuator for control valves according to claim 9, characterized in that: A hydraulic oil nozzle (71) is fixedly installed at the end of the hydraulic oil pipe (9), and a feedback rod (73) is fixedly installed at the bottom of the armature (72). Two hydraulic oil nozzles (71) are provided and symmetrically distributed around the feedback rod (73). A main valve core (78) is fixedly installed at the bottom of the feedback rod (73). A valve core conversion chamber (8) is opened inside the power stage main valve (1), and the main valve core (78) slides left and right in the valve core conversion chamber (8).

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