Servo valve and nested antler-shaped channel for servo valve

Abstract

A servo valve, comprising an outer housing, a valve assembly, and a nested antler-shaped channel. The valve assembly is arranged in the outer housing, the valve assembly is connected to the nested antler-shaped channel, and the nested antler-shaped channel is configured to be connected to a hydraulic device. The valve assembly comprises a rotary valve rod, a valve core, a valve sleeve, a crankshaft, and a first bearing. The axis of the rotary valve rod and the axis of the valve core are perpendicular to each other; the valve core is coaxial with the valve sleeve and is movably arranged in the valve sleeve; a plurality of sets of through holes configured to be in communication with the nested antler-shaped channel are formed in the valve sleeve in the axial direction of the valve sleeve; the crankshaft is connected to the bottom of the rotary valve rod; a motion groove matching the crankshaft is radially formed in the middle of the valve sleeve; the first bearing is sleeved on the crankshaft; the valve sleeve is arranged in the nested antler-shaped channel; an obround mounting hole matching the first bearing is formed in the valve core; the length direction of the obround mounting hole is perpendicular to the axial direction of the valve core; at least one annular sleeve is fixedly sleeved on two sides of the obround mounting hole on the valve core; and the annular sleeve is configured to block through holes at different positions among the plurality of sets of through holes.

Description

Servo valve and nested antler-shaped passage for servo valve

[0001] This application claims priority to Chinese patent application No. 202421603627.1, filed on July 8, 2024, the entire contents of which are incorporated herein by reference. Technical Field

[0002] This disclosure relates to the field of servo control element technology, and more particularly to a servo valve and a nested antler channel for the servo valve. Background Technology

[0003] Servo valves are key electro-hydraulic control components widely used in aerospace, machinery manufacturing, and industrial automation. They convert electrical signals into hydraulic outputs, enabling precise control of position, speed, and force. The performance of a servo valve directly affects the accuracy and response speed of the entire control system. Currently, common servo valves on the market include electro-hydraulic servo valves, proportional servo valves, and direct-drive servo valves. Summary of the Invention

[0004] This disclosure provides a servo valve and a nested antler channel for the servo valve.

[0005] In a first aspect, a servo valve is provided, including a housing, a valve assembly, and a nested antler-shaped channel. The valve assembly is housed within the housing and connected to the nested antler-shaped channel, which is configured to connect to a hydraulic device. The valve assembly includes a rotary valve stem, a valve core, a valve sleeve, a crankshaft, and a first bearing. The axis of the rotary valve stem is perpendicular to the axis of the valve core, the valve core is coaxial and movably disposed within the valve sleeve, the valve sleeve has multiple sets of through holes along its axial direction configured to communicate with the nested antler-shaped channel, the bottom of the rotary valve stem is connected to the crankshaft, the valve sleeve has a radially opening in its middle portion that mates with the crankshaft, the first bearing is sleeved on the crankshaft, the valve sleeve is disposed within the nested antler-shaped channel, the valve core has an oblong mounting hole that mates with the first bearing, the length direction of the oblong mounting hole is perpendicular to the axial direction of the valve core, and at least one annular sleeve is fixedly sleeved on each side of the oblong mounting hole on the valve core, the annular sleeve being configured to block through holes at different positions among the multiple sets of through holes.

[0006] In some embodiments, the valve assembly further includes a support shaft and a second bearing. The crankshaft simultaneously passes through the valve sleeve and the valve core and is connected to the support shaft. The axis of the support shaft coincides with the axis of the rotating valve stem. The second bearing is sleeved on the support shaft, and the support shaft is movably connected to the inner bottom of the nested antler channel through the second bearing.

[0007] In some embodiments, the valve assembly further includes a third bearing, which is sleeved on the rotating valve stem and is movably embedded in the top of the nested antler channel.

[0008] In some embodiments, the clearance between the first bearing and the waist-shaped mounting hole is 0 to 20 μm.

[0009] In some embodiments, the fitting clearance between the annular sleeve and the valve sleeve is 0–30 μm.

[0010] In some embodiments, a plurality of antler fluid channels are formed within the nested antler channel. Each of the plurality of antler fluid channels includes a main branch configured to be connected to a hydraulic device. The main branch is connected to at least one first branch. Each of the at least one first branch is connected to at least a portion of a plurality of second branches. Any of the plurality of second branches is configured to connect to a corresponding through hole in a plurality of sets of through holes.

[0011] In some embodiments, the cross-sectional area of ​​the main branch is greater than or equal to the sum of the cross-sectional areas of the corresponding first branches in at least one first branch, and the cross-sectional area of ​​the first branch is greater than or equal to the sum of the cross-sectional areas of the corresponding second branches in a plurality of second branches.

[0012] In some embodiments, the multiple sets of through holes include X sets of through holes, each set of through holes in the X sets of through holes including Y pairs of slots distributed radially along the valve sleeve; wherein, X ranges from 3 to 20, and Y ranges from 1 to 15.

[0013] In some embodiments, let the cross-sectional area of ​​the main branch be S, then S≥K1 xhxbx Y; where K1 is a multiple, and K1 takes values ​​from 2 to 16, h is the moving distance of the valve core, and b is the width of the slot.

[0014] Let the difference in cross-sectional area between the annular sleeve and the valve core be ΔS, then ΔS ≥ K2 xhxbx Y; where K2 is a multiple, and K2 ranges from 2 to 10.

[0015] In some embodiments, when the crankshaft rotates in the forward direction, it causes the valve core to slide inside the valve sleeve to the left limit position, which can open the A group of through holes in the X group of through holes; when the crankshaft rotates in the reverse direction, it causes the valve core to slide inside the valve sleeve to the right limit position, which can open the B group of through holes in the X group of through holes; wherein, the ranges of A and B are 2 to (X-1), respectively.

[0016] In some embodiments, the slot shape is at least one of waist-shaped, circular, polygonal, star-shaped, or irregular.

[0017] In some embodiments, the servo valve further includes a sealing cap, a receiving cavity configured to receive a valve sleeve is provided in the nested antler channel, and an installation port communicating with the receiving cavity is provided on one side of the nested antler channel, and a sealing cap is detachably connected to the installation port.

[0018] In some embodiments, the fitting clearance between the valve sleeve and the receiving cavity is -20 to 20 μm.

[0019] In some embodiments, the solid portion of the nested antler channel is a lattice structure.

[0020] In some embodiments, the lattice structure is any one of a rod-shaped lattice, a plate-shaped lattice, or a continuous curved surface lattice.

[0021] In some embodiments, the servo valve further includes an electric motor, a circuit board, and an angular displacement sensor. An electric motor configured to drive a rotary valve stem is housed within the housing; the electric motor is electrically connected to the circuit board, which has an angular displacement sensor mounted on it.

[0022] In some embodiments, the servo valve further includes a heat sink, which is disposed above the circuit board and located at the inner top of the housing. The top of the housing has ventilation holes.

[0023] In some embodiments, the heat sink includes at least one of thermal grease, a cooling fan, or a thermoelectric cooler.

[0024] In some embodiments, the eccentricity of the crankshaft relative to the rotating valve stem is 0.1 to 20 mm.

[0025] In some embodiments, the servo valve further includes a limiting baffle and a limiting block. The inner wall of the outer casing is provided with a limiting baffle, and the rotary valve stem is provided with a limiting block that cooperates with the limiting baffle to limit the rotation angle of the rotary valve stem.

[0026] In some embodiments, the inner wall of the outer casing is provided with at least one heat dissipation layer, and the material of the heat dissipation layer is any one of thermal conductive gel, pure copper, copper alloy, pure aluminum, aluminum alloy, pure silver or silver alloy.

[0027] In some embodiments, the thickness of a single heat dissipation layer is 0.001 mm to 10 mm.

[0028] The beneficial effects that the servo valves of some embodiments of this disclosure can achieve are as follows:

[0029] In some examples of the servo valve disclosed herein, during operation, the crankshaft rotates accordingly by rotating the valve stem clockwise or counterclockwise. Due to the eccentric setting of the crankshaft relative to the rotating valve stem, the first bearing moves left or right within the waist-shaped mounting hole inside the valve core. This, in turn, pushes the valve core to move left or right within the valve sleeve, causing the annular sleeve on the valve core to block the through holes at different positions on the valve sleeve, thereby forming different pathways to control the flow rate and direction of hydraulic oil. Ultimately, this controls the hydraulic equipment to perform corresponding actions. During the process of the crankshaft controlling the movement of the valve core, the first bearing cooperates with the rotation of the crankshaft. At the same time, the first bearing avoids the crankshaft directly acting on the valve core, thus significantly reducing wear and extending service life. Furthermore, the first bearing is always within the waist-shaped mounting hole of the valve core, making it difficult to disengage. The structure is compact, robust, and stable.

[0030] Secondly, a nested antler-shaped channel for a servo valve is provided, wherein multiple antler-shaped fluid channels are formed within the nested antler-shaped channel, each of the multiple antler-shaped fluid channels comprising: a main branch, at least one first branch, and multiple second branches. The main branch is configured to be connected to a hydraulic device; the main branch is connected to at least one first branch; each of the at least one first branch is connected to at least a portion of the multiple second branches.

[0031] In some embodiments, the cross-sectional area of ​​the main branch is greater than or equal to the sum of the cross-sectional areas of the corresponding first branches in the at least one first branch, and the cross-sectional area of ​​the first branch is greater than or equal to the sum of the cross-sectional areas of the corresponding second branches in the plurality of second branches. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of this disclosure, the accompanying drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0033] Figure 1 is an exploded view of a servo valve according to an embodiment of the present disclosure;

[0034] Figure 2 is an internal structure diagram of a servo valve according to an embodiment of the present disclosure;

[0035] Figure 3 is a structural diagram of the outer surface of a servo valve according to an embodiment of the present disclosure;

[0036] Figure 4 is an exploded view of the valve assembly according to an embodiment of the present disclosure;

[0037] Figure 5 is an assembly diagram of the valve assembly according to an embodiment of the present disclosure;

[0038] Figure 6 is a cross-sectional view of a valve assembly according to an embodiment of the present disclosure;

[0039] Figure 7 is a connection structure diagram of the rotary valve stem, crankshaft and support shaft according to an embodiment of the present disclosure;

[0040] Figure 8 is a structural diagram of the valve sleeve according to an embodiment of the present disclosure;

[0041] Figure 9 is a structural diagram of the antler fluid channel inside the nested antler channel according to an embodiment of the present disclosure;

[0042] Figure 10 is a structural diagram of the antler-shaped fluid channel in Figure 9 from another perspective;

[0043] Figure 11 is a schematic diagram of the working principle of each antler fluid channel (after disassembly) and hydraulic equipment;

[0044] Figure 12 is a connection diagram of the outer casing and the heat dissipation layer according to an embodiment of the present disclosure;

[0045] Figure 13 is a structural diagram of a rod-shaped lattice according to an embodiment of the present disclosure;

[0046] Figure 14 is a structural diagram of a plate-like lattice according to an embodiment of the present disclosure;

[0047] Figure 15 is a structural diagram of a continuous curved lattice according to an embodiment of the present disclosure;

[0048] Figure 16 is another structural diagram of the rod-shaped lattice according to an embodiment of the present disclosure.

[0049] Reference numerals: 100-Servo valve, 110-Outer shell, 120-Valve assembly, 121-Rotary valve stem, 122-Valve core, 1221-Oval mounting hole, 1222-Annular sleeve, 123-Valve sleeve, 1231-Slot, 1232-Moving slot, 124-Crankshaft, 125-First bearing, 126-Support shaft, 127-Second bearing, 128-Third bearing, 130-Nested antler channel, 131-Main branch, 132-First branch, 133-Second branch, 140-Sealing cover, 150-Electric motor, 160-Circuit board, 170-Radiator, 180-Limit block, 190-Heat dissipation layer, 130-Receiving cavity, 1302-Mounting port, 1000-Hydraulic pump, 2000-Oil source, 3000-Hydraulic equipment, 4000-Actuator. Detailed Implementation

[0050] The technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. Based on the embodiments of this disclosure, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this disclosure.

[0051] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this disclosure are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0052] In the embodiments of this disclosure, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0053] Furthermore, if the embodiments of this disclosure involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Moreover, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this disclosure.

[0054] In related technologies, servo valves can control the flow of hydraulic oil by rotating the crankshaft valve stem to drive the valve core to move linearly back and forth. However, the crankshaft valve stem and the valve core are in direct contact. After prolonged use, the crankshaft valve stem will wear out severely and is prone to breakage, causing the entire servo valve to malfunction.

[0055] To address the aforementioned technical problems, some embodiments of this disclosure provide a servo valve.

[0056] The following description refers to a servo valve 100 according to some embodiments of the present disclosure.

[0057] As shown in Figure 1, the servo valve 100 includes a housing 110, a valve assembly 120, and a nested antler channel 130.

[0058] A valve assembly 120 is provided inside the outer casing 110. The valve assembly 120 is connected to a nested antler channel 130, which is configured to connect to a hydraulic device.

[0059] In some embodiments, valve assembly 120 includes a rotating valve stem 121, a valve core 122, and a valve sleeve 123.

[0060] The axis of the rotating valve stem 121 is perpendicular to the axis of the valve core 122. For example, the axis of the rotating valve stem 121 can extend in the vertical direction shown in Figure 1, and the axis of the valve core 122 can extend in the horizontal direction shown in Figure 1.

[0061] The valve core 122 is coaxially and movably disposed within the valve sleeve 123. The valve assembly 120 also includes a crankshaft 124 and a first bearing 125. The bottom of the rotating valve stem 121 is connected to the crankshaft 124, and the first bearing 125 is sleeved on the crankshaft 124.

[0062] The valve sleeve 123 is disposed within the nested antler channel 130, and multiple sets of through holes configured to communicate with the nested antler channel 130 are provided on the valve sleeve 123 along the axial direction of the valve sleeve 123.

[0063] Referring to Figures 1 and 4, the valve sleeve 123 has a radially formed movable groove 1232 in the middle that mates with the crankshaft 124. The valve core 122 has an oblong mounting hole 1221 inside that mates with the first bearing 125. The length direction of the oblong mounting hole 1221 is perpendicular to the axial direction of the valve core 122. For example, the length direction of the oblong mounting hole 1221 can be the front-back direction shown in Figure 1, and the axial direction of the valve core 122 can be the left-right direction shown in Figure 1. At least one annular sleeve 1222 is fixedly fitted onto the outer periphery of the valve core 122 on both sides of the oblong mounting hole 1221. The annular sleeve 1222 is configured to block through holes at different positions.

[0064] In some embodiments, the valve sleeve 123 and the valve body with the nested antler channel 130 inside are two separate components. After each component is manufactured, the valve sleeve 123 is assembled into the valve body. The assembly process of the valve sleeve 123 and the nested antler channel 130 will be described below.

[0065] Of course, this disclosure is not limited thereto. In some embodiments, the valve sleeve 123 and the valve body can also be integrally formed using additive manufacturing (AM) technology, and the valve sleeve 123 and the valve body are a single unit.

[0066] In some embodiments of this disclosure, during operation, rotating the valve stem 121 clockwise or counterclockwise causes the crankshaft 124 to rotate accordingly. Due to the eccentric setting of the crankshaft 124 relative to the rotating valve stem 121, the first bearing 125 is driven to move left or right within the waist-shaped mounting hole 1221 inside the valve core 122. This pushes the valve core 122 to move left or right within the valve sleeve 123, so that the annular sleeve 1222 on the valve core 122 blocks the through holes at different positions of the valve sleeve 123, thereby forming different passages to control the flow rate and direction of hydraulic oil, and ultimately controlling the hydraulic equipment to perform corresponding actions.

[0067] During the movement of the valve core 122 controlled by the crankshaft 124, the first bearing 125 cooperates with the rotation of the crankshaft 124. Furthermore, the first bearing 125 prevents the crankshaft 124 from directly acting on the valve core 122, thus significantly reducing wear on the crankshaft 124 and extending the service life of the servo valve 100. In addition, the first bearing 125 remains within the oblong mounting hole 1221 of the valve core 122, preventing it from easily dislodging. This results in a compact, robust, and stable structure that meets the usage requirements.

[0068] It should be noted that since the axis of the crankshaft 124 revolves around the axis of the rotating valve stem 121, the movable groove 1232 can be matched with the revolution range of the crankshaft 124. When the axis of the crankshaft 124 rotates to its front and rear limit positions, it is exactly located at the front and rear ends of the waist-shaped mounting hole 1221 in the length direction. When the axis of the crankshaft 124 rotates to its left and right limit positions, it can drive the valve core 122 to move to the corresponding left and right limit positions, so that the valve core 122 only moves linearly left and right.

[0069] The first bearing 125 can be any one of a radial contact bearing, an angular contact radial bearing, an axial contact bearing, or an angular contact thrust bearing. The fitting clearance between the first bearing 125 and the oblong mounting hole 1221 is 0–20 μm (e.g., 0 μm, 5 μm, 10 μm, 15 μm, 20 μm, etc.). For example, the fitting clearance between the first bearing 125 and the oblong mounting hole 1221 can be 0–10 μm (e.g., 2 μm, 3 μm, 6 μm, 8 μm, etc.). Here, the size of the fitting clearance has a significant impact on the control accuracy; reducing the fitting clearance can increase the control precision.

[0070] The diameter of valve core 122 is 1 to 100 mm (e.g., 1 mm, 10 mm, 30 mm, 50 mm, 70 mm, 90 mm, 100 mm, etc.). For example, the diameter of valve core 122 can be 2 to 70 mm (e.g., 2 mm, 15 mm, 25 mm, 35 mm, 45 mm, 55 mm, 65 mm, 70 mm, etc.).

[0071] Two to ten annular sleeves 1222 can be provided on the valve core 122. The wall thickness of the valve sleeve 123 is 0.5 to 20 mm (such as 0.5 mm, 5 mm, 10 mm, 15 mm, 18 mm, 20 mm, etc.). For example, the wall thickness of the valve sleeve 123 can be 0.6 to 2 mm (such as 0.6 mm, 0.8 mm, 1 mm, 1.5 mm, 2 mm, etc.).

[0072] The fitting clearance between the annular sleeve 1222 and the valve sleeve 123 is 0 to 30 μm (e.g., 0 μm, 10 μm, 20 μm, 30 μm, etc.). For example, the fitting clearance between the annular sleeve 1222 and the valve sleeve 123 can be 0 to 10 μm (e.g., 1 μm, 4 μm, 6 μm, 8 μm, etc.). Here, the size of the fitting clearance will affect the internal leakage. The smaller the fitting clearance, the less leakage. The fitting clearance can be designed according to the requirements.

[0073] The housing 110 can be formed by laser powder bed melting, electron beam powder bed melting, binder spraying, direct energy deposition, material extrusion, cold spraying, casting, forging or machining; the housing 110 can be made of aluminum alloy, titanium alloy, high temperature alloy, stainless steel, mold steel, plastic or composite material; the surface of the housing 110 is treated with at least one of sandblasting, electroplating, spraying, anodizing, coating or painting.

[0074] The valve sleeve 123, valve core 122, and crankshaft 124 can be formed by laser powder bed melting, electron beam powder bed melting, binder spraying, direct energy deposition, stereolithography, injection molding, cold spraying, casting, electrical discharge machining, or machining; the valve sleeve 123, valve core 122, and crankshaft 124 can be made of aluminum alloy, titanium alloy, high-temperature alloy, stainless steel, mold steel, ceramic, or composite material; the surfaces of the valve sleeve 123, valve core 122, and crankshaft 124 can be treated with at least one of sandblasting, electroplating, spraying, anodizing, physical vapor deposition, chemical vapor deposition, coating, or painting.

[0075] As one possible implementation, referring to Figures 1, 5 and 6, the valve assembly 120 further includes a support shaft 126 and a second bearing 127. The crankshaft 124 simultaneously passes through the valve sleeve 123 and the valve core 122 and is connected to the support shaft 126. The axis of the support shaft 126 coincides with the axis of the rotating valve stem 121. The second bearing 127 is sleeved on the support shaft 126. The support shaft 126 is movably connected to the inner bottom of the nested antler channel 130 (the lower part of the nested antler channel 130 in Figure 1) through the second bearing 127.

[0076] In some embodiments, by designing the crankshaft 124 to pass through the valve sleeve 123 and the valve core 122, the valve core 122 is driven by the middle of the crankshaft 124. Compared to driving the valve core 122 by the ends of the crankshaft 124, driving the valve core 122 by the middle of the crankshaft 124 results in less force on the crankshaft 124, reducing the risk of breakage and thus extending the service life of the crankshaft 124. Furthermore, the cooperation of the support shaft 126 and the second bearing 127 supports the crankshaft 124 and the rotating valve stem 121, resulting in good operational stability and low wear.

[0077] As one possible implementation, referring to FIG1, the valve assembly 120 further includes a third bearing 128. The third bearing 128 is sleeved on the rotating valve stem 121. The third bearing 128 is movably embedded in the top of the nested antler channel 130 (the upper part of the nested antler channel 130 in FIG1). The third bearing 128 can rotate with the rotating valve stem 121 and is supported on the nested antler channel 130, thereby improving operational stability and reducing wear.

[0078] As one possible implementation, referring to Figures 9 and 10, a plurality of antler fluid channels are formed within the nested antler channel 130. Each antler fluid channel includes a main branch 131 configured to be connected to a hydraulic device. The main branch 131 is connected to at least one first branch 132. The at least one first branch 132 is connected to at least a portion of a plurality of second branches 133. The second branches 133 are configured to connect to corresponding through holes in a plurality of sets of through holes.

[0079] In some embodiments, multiple antler fluid channels opened within the nested antler channel 130 can flow through different hydraulic oil passages respectively. Furthermore, the hydraulic oil can be evenly divided into multiple streams and connected to corresponding through holes through the first branch 132 and the second branch 133, so that the valve core 122 is subjected to uniform force and the drive is more stable.

[0080] It should be noted that the number of first branches 132 is 1 to 10, and the number of second branches 133 is 2 to 40. The number of first branches 132 and second branches 133 can be designed according to actual needs. The wall thickness of the antler fluid channel is 0.1 to 5 mm (e.g., 0.8 mm, 1.5 mm, 3 mm, 3.8 mm, 4.5 mm, 5 mm, etc.), and can be uniform or non-uniform. The proportion of non-uniform wall thickness can vary from 20% to 80% (e.g., 20%, 30%, 40%, 50%, 60%, 70%, 80%, etc.).

[0081] The nested antler channel 130 can be formed by laser powder bed melting, electron beam powder bed melting, binder spraying, direct energy deposition, stereolithography, material extrusion, cold spraying, or casting. The nested antler channel 130 can be made of aluminum alloy, titanium alloy, high-temperature alloy, stainless steel, or mold steel. The surface of the nested antler channel 130 can be sandblasted, electroplated, sprayed, anodized, or coated. The inner wall of the nested antler channel 130 can be treated with one or more of the following: ultrasonic cleaning, abrasive flow, water flow, magnetic abrasion, chemical polishing, or oil cleaning.

[0082] The following describes several methods for forming nested antler channels 130:

[0083] (1) When the nested antler channel 130 is formed by laser powder bed melting, the forming method includes the following steps:

[0084] Step S101: The powder is batched, sieved, and dried, and then loaded into a manufacturing environment equipped with a forming platform;

[0085] Step S102: Preheat the forming platform and replace the manufacturing environment with inert gas;

[0086] Step S103: Powder is spread on the surface of the forming platform, and then the powder layer is scanned and sintered in a local area by laser.

[0087] Step S104: The forming platform descends by one layer thickness, and step S103 is repeated until the three-dimensional nested antler channel 130 is formed.

[0088] (2) When the nested antler channel 130 is formed by electron beam powder bed melting, the forming method includes the following steps:

[0089] Step S201: The powder is batched, sieved, and dried, and then loaded into a manufacturing environment equipped with a forming platform;

[0090] Step S202: Preheat the forming platform and evacuate the manufacturing environment;

[0091] Step S203: Powder is spread on the surface of the forming platform, and then the powder-spreading layer area is heated by electron beam scanning;

[0092] Step S204: Scan and sinter a local area of ​​the powder-coated layer using an electron beam;

[0093] Step S205: The sintering area is kept at a certain temperature for a certain period of time, and the forming platform is lowered by one layer thickness;

[0094] Step S206: Repeat steps S203 to S205 until the three-dimensional nested antler channel 130 is formed.

[0095] (3) When the nested antler channel 130 is formed by adhesive spraying, the forming method includes the following steps:

[0096] Step S301: The powder is batched, sieved, and dried, and then loaded into a manufacturing environment equipped with a forming platform;

[0097] Step S302: Spread and compact the powder on the surface of the forming platform, and use a nozzle to spray the adhesive onto the surface of the powder layer according to the cross section of the current layer model to bond the powder particles together and form a solid structure.

[0098] Step S303: The forming platform descends by one layer thickness, and step S302 is repeated until the bonding of the three-dimensional nested antler channels 130 is completed to form a printing blank;

[0099] Step S304: The printing preform is cured by drying or chemical reaction, and the three-dimensional nested antler channel 130 is formed.

[0100] (4) When the nested antler channel 130 is formed by casting, the forming method includes the following steps:

[0101] Step S401: Melt the material of the casting to form molten metal;

[0102] Step S402: Pour the molten metal into the mold, let it enter the mold cavity through the gate, and fill the entire mold cavity;

[0103] Step S403: After the metal filling is completed, wait for a certain period of time for the metal to cool and solidify;

[0104] Step S404: After the casting has completely cooled, disassemble the mold to complete the three-dimensional nested antler channel 130 forming.

[0105] As one possible implementation, the cross-sectional area of ​​the main branch 131 is greater than or equal to the sum of the cross-sectional areas of the corresponding first branches 132, and the cross-sectional area of ​​the first branches 132 is greater than or equal to the sum of the cross-sectional areas of the corresponding second branches 133, thereby preventing flow saturation.

[0106] As one possible implementation, referring to Figures 1 and 4, the valve sleeve 123 is provided with X sets of through holes arranged axially, each set of through holes including Y pairs of slots 1231 distributed radially along the valve sleeve 123. For example, the Y pairs of slots 1231 can be spaced apart circumferentially in the valve sleeve 123. X ranges from 3 to 20, Y ranges from 1 to 15, and the spacing L between adjacent sets of through holes is 0 to 10 mm, which can be designed according to actual usage requirements.

[0107] As one possible implementation, let the cross-sectional area of ​​the main branch 131 be S, then S≥K1 xhxbx Y; where K1 is a multiple and takes any value from 2 to 16, h is the moving distance of the valve core 122, and b is the width of the slot 1231. Here, the width of the slot 1231 refers to the circumferential dimension of the slot 1231 in the valve sleeve 123.

[0108] Let ΔS be the difference between the cross-sectional areas of the annular sleeve 1222 and the valve core 122. Then ΔS ≥ K2 xhxbx Y; where K2 is a multiple and takes any value from 2 to 10, thereby preventing flow saturation.

[0109] As one possible implementation, when the crankshaft 124 rotates in the forward direction, it drives the valve core 122 to slide to the left limit position inside the valve sleeve 123, thus opening the A group of through holes. When the crankshaft 124 rotates in the reverse direction, it drives the valve core 122 to slide to the right limit position inside the valve sleeve 123, thus opening the B group of through holes. Here, the ranges of A and B are 2 to (X-1), thereby ensuring that a passage can be formed even when the valve core 122 moves to the limit position.

[0110] For example, the positive direction mentioned above can be seen as direction C1 in Figure 1; the negative direction can be seen as direction C2 in Figure 1.

[0111] As one possible implementation, the shape of the slot 1231 is at least one of the following: waist-shaped, circular, polygonal (e.g., rectangle, pentagon, etc.), star-shaped, or irregular (e.g., irregular polygon). The shape of the slot 1231 can be designed according to actual needs.

[0112] As one possible implementation, referring to Figures 1 and 2, the servo valve 100 further includes a sealing cover 140. A receiving cavity 1301 configured to accommodate a valve sleeve 123 is provided in the nested antler channel 130. An installation port 1302 communicating with the receiving cavity is provided on one side of the nested antler channel 130. The sealing cover 140 is detachably connected (e.g., threaded connection or screw connection) to the installation port. This facilitates the assembly of the valve sleeve 123. After assembly, the sealing cover 140 is installed on the installation port, thereby fixing the valve sleeve 123 in the nested antler channel 130 to prevent the valve sleeve 123 from moving.

[0113] It should be noted that the fitting clearance between the valve sleeve 123 and the receiving cavity is -20 to 20 μm (e.g., -20 μm, -15 μm, -10 μm, -5 μm, 0 μm, 5 μm, 10 μm, 15 μm, 20 μm, etc.). For example, the fitting clearance between the valve sleeve 123 and the receiving cavity can be -10 to 10 μm (e.g., -10 μm, -8 μm, -6.5 μm, -5 μm, 0 μm, 5 μm, 6.5 μm, 8 μm, 10 μm, etc.). The size of the fitting clearance will affect the internal leakage. In principle, the smaller the better. The fitting clearance can be selected according to the design requirements.

[0114] The assembly method of valve sleeve 123 and nested antler channel 130 is as follows: freeze the 3D printed valve sleeve 123 to reduce the size of valve sleeve 123; embed the valve sleeve 123 into the receiving cavity of nested antler channel 130 at room temperature; and wait for the valve sleeve 123 to return to room temperature to complete the interference fit non-destructive assembly.

[0115] As one possible implementation, referring to Figures 13 to 16, the solid part of the nested antler channel 130 is a lattice structure, which can be any one of a rod-shaped lattice, a plate-shaped lattice, or a continuous curved surface lattice, thereby achieving the purpose of weight reduction, making the entire servo valve lighter and reducing material costs. The weight reduction ratio can be set from 0.5% to 99.5%.

[0116] It should be noted that the rod-shaped lattice can be configured as a variable density structure (as shown in Figure 16). The rod-shaped lattice with variable density can be constructed by taking the 3D stress mapping of the part as input. The stress mapping can be converted into a material density mapping. The generated lattice has a larger density in the area with higher stress and a smaller density in the area with lower stress, thereby improving the uniformity of stress bearing.

[0117] As one possible implementation, referring to Figures 1 and 2, the servo valve 100 further includes an electric motor 150, a circuit board 160, and an angular displacement sensor. An electric motor 150 configured to drive the rotary valve stem 121 to rotate is disposed within the housing 110. The electric motor 150 is electrically connected to the circuit board 160, and the circuit board 160 is equipped with an angular displacement sensor.

[0118] In some embodiments, after receiving a signal, the circuit board 160 can drive the electric motor 150 to run. The electric motor 150 can drive the rotary valve stem 121 to rotate, thereby driving the crankshaft 124 to rotate. The angular displacement sensor can collect the current rotation angle of the crankshaft 124 and feed it back to the circuit board 160. The difference between the rotation angle of the crankshaft 124 and the input signal is compared in real time, and the rotation speed and position of the crankshaft 124 are dynamically adjusted to achieve closed-loop control.

[0119] It should be noted that the diameter of the electric motor 150 is 5-200mm (e.g., 5mm, 15mm, 40mm, 60mm, 90mm, 130mm, 150mm, 180mm, 200mm, etc.), and the height is 5-200mm (e.g., 5mm, 20mm, 45mm, 65mm, 95mm, 135mm, 155mm, 185mm, 200mm, etc.). The electric motor 150 includes a stator and a rotor. The rotor can be integrated with the rotating valve stem 121. The thermal conductivity of the stator of the electric motor 150 can be increased through a potting process.

[0120] Angular displacement sensors can be any of the following: capacitive encoders, photoelectric encoders, magnetic encoders, Hall effect sensors, inductive sensors, resistive sensors, microelectromechanical systems (MEMS) sensors, or laser sensors.

[0121] The circuit board 160 has 1 to 20 layers (e.g., 1, 3, 5, 9, 12, 14, 18, or 20), and the number of layers can be designed according to requirements. A connector is provided on the side wall of the housing 110, which is configured to communicate with external devices for power and signal exchange.

[0122] As one possible implementation, referring to FIG2, the servo valve 100 further includes a heat sink 170. The heat sink 170 is disposed above the circuit board 160 and is located at the inner top of the housing 110. The top of the housing 110 is provided with heat dissipation holes. The arrangement of the heat sink 170 and the heat dissipation holes can dissipate heat from the circuit board 160, thereby ensuring that the circuit board 160 can operate efficiently.

[0123] As one possible implementation, the heat sink 170 may include at least one of thermal grease, a cooling fan, or a thermoelectric cooler, all of which can meet the heat dissipation requirements. Other suitable heat sinks may also be used for the heat sink 170.

[0124] As one possible implementation, the eccentricity of the crankshaft 124 relative to the rotary valve stem 121 is 0.1 to 20 mm (e.g., 0.1 mm, 1 mm, 5 mm, 10 mm, 15 mm, or 20 mm, etc.). For example, the eccentricity of the crankshaft 124 relative to the rotary valve stem 121 can be 0.5 to 2.5 mm (e.g., 0.5 mm, 0.8 mm, 1.5 mm, 2 mm, or 2.5 mm), which can be designed according to actual usage requirements.

[0125] As one possible implementation, the servo valve 100 further includes a limiting baffle and a limiting block 180 (see Figure 7). The inner wall of the outer casing 110 is provided with a limiting baffle, and the rotating valve stem 121 is provided with a limiting block 180 that cooperates with the limiting baffle to limit the rotation angle of the rotating valve stem 121, thereby limiting the rotation angle of the crankshaft 124.

[0126] Here, the limited crankshaft 124 rotation angle is 0 to 180° (e.g., 0, 30°, 80°, 100°, 150°, 180°, etc.). For example, the limited crankshaft 124 rotation angle can be 10° to 170° (e.g., 10°, 35°, 50°, 70°, 100°, 120°, 150°, 170°, etc.).

[0127] As one possible implementation, referring to Figures 3 and 12, the inner wall of the outer casing 110 is provided with at least one heat dissipation layer 190. The material of the heat dissipation layer 190 is any one of thermal conductive gel, pure copper, copper alloy, pure aluminum, aluminum alloy, pure silver or silver alloy. The heat dissipation layer 190 can dissipate the heat generated by the internal components of the outer casing 110 during operation, thereby helping to reduce the failure rate.

[0128] It should be noted that the heat dissipation layer 190 is manufactured using at least one of the following methods: hot extrusion, direct energy deposition, coating, electroplating, chemical plating, hot-dip plating, cold spraying, vapor deposition, or thermal spraying.

[0129] The number of heat dissipation layers 190 is ≥1. For example, the number of heat dissipation layers 190 can be 1 to 5 (e.g., 1, 2, 3, 4, or 5). The thickness of a single layer of heat dissipation layer 190 is 0.001mm to 10mm (e.g., 0.001mm, 0.5mm, 1mm, 2mm, 5mm, 8mm, 10mm, etc.). For example, the thickness of a single layer of heat dissipation layer 190 is 0.01mm to 0.5mm (e.g., 0.01mm, 0.05mm, 0.08mm, 0.2mm, 0.4mm, 0.5mm, etc.).

[0130] As one possible implementation, to improve the surface strength of the outer shell 110 and the nested antler channel 130, a reinforcing texture can be provided on the outer wall of the outer shell 110 and the nested antler channel 130. The reinforcing texture can be at least one of the following: triangular texture, square texture, hexagonal texture, octagonal texture, rhombic dodecahedral texture, double-angle tensile texture, single-angle tensile texture, or random texture.

[0131] It should be noted that in some embodiments of this disclosure, the sealing parts of the servo valve 100 need to use sealing rings. The sealing rings may include O-rings and retaining rings. The O-rings may be made of nitrile rubber, hydrogenated nitrile rubber, fluororubber, silicone rubber, EPDM rubber, acrylate rubber, ethylene acrylate rubber, polyester polyurethane rubber or polyether polyurethane rubber, and the hardness of the O-rings is 70-100HA. The retaining rings may be made of polytetrafluoroethylene, nylon 6 (polyamide 6), nylon 1010 (decanedioyl decylamine salt), and the hardness of the retaining rings is greater than or equal to 90HS.

[0132] The working principle of some embodiments of this disclosure is explained below: Referring to FIG11, four groups of antler fluid channels can be set, namely the first group of antler fluid channels E, the second group of antler fluid channels O, the third group of antler fluid channels Y1 and the fourth group of antler fluid channels Y2.

[0133] The first group of antler-shaped fluid channels E has one main branch 131, eight first branches 132, and sixteen second branches 133; the second group of antler-shaped fluid channels O has one main branch 131, four first branches 132, and sixteen second branches 133; either the third group of antler-shaped fluid channels Y1 or the fourth group of antler-shaped fluid channels Y2 has one main branch 131, two first branches 132, and eight second branches 133. The main branch 131 of the first group of antler-shaped fluid channels E is connected to the hydraulic pump 1000, the main branch 131 of the second group of antler-shaped fluid channels O is connected to the oil source 2000, and the third group of antler-shaped fluid channels Y1 and the fourth group of antler-shaped fluid channels Y2 are respectively connected to the oil inlet and oil return port of the hydraulic equipment 3000 (e.g., a hydraulic cylinder).

[0134] Referring to Figure 8, the valve sleeve 123 is provided with two sets of through holes a, one set of through holes b, one set of through holes c, and two sets of through holes d. The two sets of through holes a are located at both ends of the valve sleeve 123 along the axial direction, and the two sets of through holes d are located in the middle of the valve sleeve 123 and are spaced apart along the axial direction of the valve sleeve 123. One set of through holes b is located between one set of through holes a and one set of through holes d, and one set of through holes c is located between the other set of through holes a and the other set of through holes d.

[0135] Each group of through holes a has 8 slots 1231, and the 8 slots 1231 of each group of through holes a are respectively connected to the eight second branches 133 of the first group of antler fluid channels E.

[0136] Either through hole b or through hole c has eight slots 1231. The eight slots 1231 of through hole b are respectively connected to eight second branches 133 of the third group of antler fluid channels Y1; the eight slots 1231 of through hole c are respectively connected to eight second branches 133 of the fourth group of antler fluid channels Y2.

[0137] Each group of through holes d has 8 slots 1231, and the 16 slots 1231 in the two groups of through holes d are respectively connected to the sixteen second branches 133 of the second group of antler fluid channels O.

[0138] After being correctly assembled according to the above relationship, the antler fluid channel is connected to the through hole of the valve sleeve 123 through the second branch 133 to form a passage. The working process of the servo valve 100 is mainly to calculate the current control signal according to the target position given by the hydraulic system, and after digital / analog (D / A) conversion, transmit it to the servo amplifier to drive the electric motor 150 to make the crankshaft 124 rotate in the forward or reverse direction. The angular displacement sensor collects the current rotation angle of the crankshaft 124 and feeds it back to the circuit board 160. The difference between the rotation angle of the crankshaft 124 and the input signal is compared in real time, and the rotation speed and position of the crankshaft 124 are dynamically adjusted to achieve closed-loop control.

[0139] The crankshaft 124 rotates in either the forward or reverse direction, thereby driving the valve core 122 to move to the left or right.

[0140] When the crankshaft 124 rotates in the forward direction, causing the valve core 122 to slide to the left inside the valve sleeve 123, at this time, the first set of antler fluid channels E and the fourth set of antler fluid channels Y2 form a passage, and the second set of antler fluid channels O and the third set of antler fluid channels Y1 form a passage, causing the push rod of the actuator 4000 in the hydraulic equipment to move to the right.

[0141] When the crankshaft 124 rotates in the opposite direction, causing the valve core 122 to slide to the right inside the valve sleeve 123, the first set of antler fluid channels E and the third set of antler fluid channels Y1 form a passage, and the second set of antler fluid channels O and the fourth set of antler fluid channels Y2 form a passage, causing the actuator push rod to move to the left, thereby realizing the action execution control of the hydraulic equipment.

[0142] The above are merely some embodiments of this disclosure and are not intended to limit the scope of protection of this disclosure. Any equivalent structural or procedural transformations made based on the description and drawings of some embodiments of this disclosure, or direct or indirect applications in other related technical fields, are included within the scope of protection of this disclosure.

Claims

1. A servo valve, comprising: outer shell; A valve assembly is disposed within the housing. as well as A nested antler-shaped channel is provided, and the valve assembly is connected to the nested antler-shaped channel, which is configured to connect to a hydraulic device; wherein the valve assembly includes: Rotate valve stem; The valve core, wherein the axis of the rotating valve stem is perpendicular to the axis of the valve core; and A valve sleeve, wherein the valve core is coaxially and movably disposed within the valve sleeve; the valve sleeve has multiple sets of through holes configured to communicate with the nested antler channel along the valve sleeve axial direction; The crankshaft is connected to the bottom of the rotary valve stem, and the valve sleeve has a radially formed movable groove in the middle that mates with the crankshaft. The first bearing is sleeved on the crankshaft. The valve sleeve is disposed in the nested antler channel. The valve core has an oblong mounting hole that mates with the first bearing. The length direction of the oblong mounting hole is perpendicular to the axial direction of the valve core. At least one annular sleeve is fixedly sleeved on both sides of the oblong mounting hole on the valve core. The annular sleeve is configured to block the through holes at different positions in the multiple sets of through holes.

2. The servo valve according to claim 1, wherein, The valve assembly also includes: A support shaft, wherein the crankshaft movably passes through the valve sleeve and the valve core and is connected to the support shaft, the axis of the support shaft coincides with the axis of the rotating valve stem; and The second bearing is sleeved on the support shaft, and the support shaft is movably connected to the inner bottom of the nested antler channel through the second bearing.

3. The servo valve according to claim 1 or 2, wherein, The valve assembly also includes: The third bearing is sleeved on the rotary valve stem and is movably embedded in the top of the nested antler channel.

4. The servo valve according to any one of claims 1 to 3, wherein, The clearance between the first bearing and the waist-shaped mounting hole is 0 to 20 μm.

5. The servo valve according to any one of claims 1 to 4, wherein, The fitting clearance between the annular sleeve and the valve sleeve is 0–30 μm.

6. The servo valve according to any one of claims 1 to 5, wherein, The nested antler channels contain multiple antler fluid channels, each of which includes: The main branch is configured to connect to the hydraulic equipment; At least one first branch, and the main branch is connected to the at least one first branch; A plurality of second branches, each of the at least one first branch being connected to at least a portion of the plurality of second branches, and any one of the plurality of second branches being configured to connect to a corresponding through hole in the plurality of sets of through holes.

7. The servo valve according to claim 6, wherein, The cross-sectional area of ​​the main branch is greater than or equal to the sum of the cross-sectional areas of the corresponding first branches in the at least one first branch, and the cross-sectional area of ​​the first branch is greater than or equal to the sum of the cross-sectional areas of the corresponding second branches in the plurality of second branches.

8. The servo valve according to claim 6, wherein, The multiple sets of through holes include X sets of through holes, and each set of through holes in the X sets of through holes includes Y pairs of slots distributed radially along the valve sleeve; wherein, X ranges from 3 to 20, and Y ranges from 1 to 15.

9. The servo valve according to claim 8, wherein, Let the cross-sectional area of ​​the main branch be S, then S≥K1 xhxbx Y; where K1 is a multiple, and K1 takes values ​​from 2 to 16, h is the moving distance of the valve core, and b is the width of the slot. Let ΔS be the difference between the cross-sectional areas of the annular sleeve and the valve core. Then ΔS ≥ K2 xhxbx Y; where K2 is a multiple and K2 ranges from 2 to 10.

10. The servo valve according to claim 8, wherein, When the crankshaft rotates in the forward direction, it causes the valve core to slide to the left limit position inside the valve sleeve, which can open the A group of the X group of through holes. When the crankshaft rotates in the reverse direction, it causes the valve core to slide to the right limit position inside the valve sleeve, which can open the B group of the X group of through holes. The ranges of A and B are 2 to (X-1), respectively.

11. The servo valve according to claim 8, wherein, The shape of the slot is at least one of waist-shaped, circular, polygonal, star-shaped, or irregular.

12. The servo valve according to any one of claims 1 to 11, further comprising a sealing cap, wherein, The nested antler channel has a receiving cavity configured to accommodate the valve sleeve. One side of the nested antler channel has an installation port that communicates with the receiving cavity, and the sealing cap is detachably connected to the installation port.

13. The servo valve according to claim 12, wherein, The fitting clearance between the valve sleeve and the receiving cavity is -20 to 20 μm.

14. The servo valve according to any one of claims 1 to 13, wherein, The solid portion of the nested antler channels has a lattice structure.

15. The servo valve according to claim 14, wherein, The crystal structure is any one of a rod-shaped crystal lattice, a plate-shaped crystal lattice, or a continuous curved surface crystal lattice.

16. The servo valve according to any one of claims 1 to 15, further comprising: An electric motor is provided inside the housing and configured to drive the rotary valve stem to rotate; The circuit board is electrically connected to the electric motor. as well as An angular displacement sensor is provided on the circuit board.

17. The servo valve according to claim 16, further comprising: A heat sink is provided on top of the circuit board. The heat sink is located at the inner top of the outer casing, and the top of the outer casing has heat dissipation holes.

18. The servo valve according to claim 17, wherein, The heat sink includes at least one of thermal grease, a cooling fan, or a thermoelectric cooler.

19. The servo valve according to any one of claims 1 to 18, wherein, The eccentricity of the crankshaft relative to the rotary valve stem is 0.1 to 20 mm.

20. The servo valve according to any one of claims 1 to 19, further comprising: The outer casing has a limiting baffle and a limiting block. The limiting baffle is provided on the inner wall of the outer casing, and the limiting block is provided on the rotary valve rod to cooperate with the limiting baffle, so as to limit the rotation angle of the rotary valve rod.

21. The servo valve according to any one of claims 1 to 20, wherein, The inner wall of the outer casing is provided with at least one heat dissipation layer, and the material of the heat dissipation layer is any one of thermal conductive gel, pure copper, copper alloy, pure aluminum, aluminum alloy, pure silver or silver alloy.

22. The servo valve according to claim 21, wherein, The thickness of a single heat dissipation layer is 0.001 mm to 10 mm.

23. A nested antler-shaped channel for a servo valve, wherein, The nested antler channels contain multiple antler fluid channels, each of which includes: The main branch is configured to connect to hydraulic equipment; At least one first branch, and the main branch is connected to the at least one first branch; A plurality of second branches, each of the at least one first branch being connected to at least a portion of the plurality of second branches.

24. The nested antler-shaped channel for a servo valve according to claim 23, wherein, The cross-sectional area of ​​the main branch is greater than or equal to the sum of the cross-sectional areas of the corresponding first branches in the at least one first branch, and the cross-sectional area of ​​the first branch is greater than or equal to the sum of the cross-sectional areas of the corresponding second branches in the plurality of second branches.

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