Servo valve

Abstract

The servo valve comprises an outer shell, a valve assembly is arranged in the outer shell, the valve assembly is connected with a nested antler channel, and the nested antler channel is used for being connected with hydraulic equipment; the valve assembly comprises a rotary valve rod, a valve element and a valve sleeve, the axis of the rotary valve rod is perpendicular to the axis of the valve element, the valve element is coaxially and movably arranged in the valve sleeve, the bottom of the rotary valve rod is connected with a crankshaft, the crankshaft is sleeved with a first bearing, and the valve sleeve is arranged in the nested antler channel. A plurality of through holes used for being communicated with the nested antler channels are formed in the valve sleeve in the axial direction of the valve sleeve, a movable groove matched with the crankshaft is formed in the middle of the valve sleeve in the radial direction, a kidney-shaped mounting hole matched with the first bearing is formed in the valve element, and the length direction of the kidney-shaped mounting hole is perpendicular to the axial direction of the valve element. And at least one annular sleeve is fixedly arranged on the valve element and located on the two sides of the mounting hole in a sleeving mode, the annular sleeves are used for blocking the through holes in different positions, and the valve rod has the advantages that abrasion of the valve rod is reduced, and the service life is prolonged.

Description

Technical Field

[0001] The present application relates to the technical field of servo control elements, and in particular to a servo valve. Background Art

[0002] Servo valve is a key electro-hydraulic control component, widely used in aerospace, machinery manufacturing, industrial automation and other fields. It can convert electrical signals into hydraulic output to achieve precise control of position, speed and force. The performance of the servo valve directly affects the accuracy and response speed of the entire control system. At present, the common servo valves on the market include electro-hydraulic servo valves, proportional servo valves and direct-drive servo valves.

[0003] The existing servo valve can drive the valve core to move back and forth in a straight line by rotating the crankshaft valve stem, thereby adjusting the flow of hydraulic oil. However, the crankshaft valve stem and the valve core are in direct contact and cooperation. After being used for a long time, the crankshaft valve stem is severely worn and prone to breakage, causing the entire servo valve to be unable to be used normally. Utility Model Content

[0004] The main purpose of the present application is to provide a servo valve, aiming to solve the technical problem that the valve stem in the existing electro-hydraulic servo valve is prone to severe wear after long-term use, thus affecting normal use.

[0005] To achieve the above-mentioned purpose, the present application provides a servo valve, including an outer shell, in which a valve assembly is arranged, the valve assembly is connected to a nested antler channel, and the nested antler channel is used to connect to hydraulic equipment; wherein the valve assembly includes a rotating valve stem, a valve core and a valve sleeve, the axis of the rotating valve stem and the axis of the valve core are perpendicular to each other, the valve core is coaxial and movably arranged in the valve sleeve, the bottom of the rotating valve stem is connected to a crankshaft, a first bearing is sleeved on the crankshaft, the valve sleeve is arranged in the nested antler channel, a plurality of through holes for communicating with the nested antler channel are opened on the valve sleeve along the axial direction of the valve sleeve, an active groove cooperating with the crankshaft is radially opened in the middle part of the valve sleeve, a waist-shaped mounting hole cooperating with the first bearing is opened inside the valve core, the length direction of the waist-shaped mounting hole is perpendicular to the axial direction of the valve core, and at least one annular sleeve is fixedly sleeved on both sides of the mounting hole on the valve core, and the annular sleeve is used to seal the through holes at different positions.

[0006] Optionally, the crankshaft simultaneously moves through the valve sleeve and the valve core and is connected to a support shaft, the axis of the support shaft coincides with the axis of the rotating valve stem, a second bearing is sleeved on the support shaft, and the support shaft is movably connected to the bottom of the nested antler channel through the second bearing.

[0007] Optionally, a third bearing is sleeved on the rotating valve stem, and the third bearing is movably embedded in the top of the nested antler channel.

[0008] Optionally, the fitting clearance between the first bearing and the waist-shaped mounting hole is 0-20 μm.

[0009] Optionally, the fitting clearance between the annular sleeve and the valve sleeve is 0-30 μm.

[0010] Optionally, multiple antler fluid channels are opened in the nested antler channel, each antler fluid channel includes a main branch for connecting to the hydraulic equipment, the main branch is connected to a plurality of first branches, the first branches are connected to a plurality of second branches, and the second branches are used to connect to corresponding through holes.

[0011] Optionally, 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, 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.

[0012] Optionally, the valve sleeve is provided with X groups of through holes axially arranged, each group of through holes includes Y pairs of slots distributed radially along the valve sleeve; wherein the range of X is 3-20, and the range of Y is 1-15.

[0013] Optionally, assuming that the cross-sectional area of ​​the main branch is S, then S≥K1*h*b*Y; wherein K1 is a multiple, and K1 is 2 to 16, h is the moving distance of the valve core, and b is the width of the slot;

[0014] Assuming that the difference between the cross-sectional area of ​​the annular sleeve and the valve core is ΔS, then ΔS≥K2*h*b*Y; wherein K2 is a multiple, and K2 is 2-10.

[0015] Optionally, when the crankshaft rotates forward and drives the valve core to slide to the left limit position inside the valve sleeve, group A through holes can be opened, and when the crankshaft rotates reversely and drives the valve core to slide to the right limit position inside the valve sleeve, group B through holes can be opened; wherein the ranges of A and B are both 2 to (X-1).

[0016] Optionally, the slot hole has a shape of at least one of a waist shape, a circle, a polygon, a star shape or an irregular shape.

[0017] Optionally, a receiving cavity for receiving the valve sleeve is provided in the nested antler channel, and a mounting port communicating with the receiving cavity is provided on one side of the nested antler channel, and a sealing cover is detachably connected to the mounting port.

[0018] Optionally, the matching clearance between the valve sleeve and the accommodating cavity is -20 to 20 μm.

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

[0020] Optionally, the lattice structure is any one of a rod lattice, a plate lattice or a continuous curved surface lattice.

[0021] Optionally, an electric motor for driving the rotary valve stem to rotate is disposed in the outer shell, and the electric motor is electrically connected to a circuit board, and an angular displacement sensor is disposed on the circuit board.

[0022] Optionally, a radiator is arranged above the circuit board, the radiator is located at the top of the outer shell, and a heat dissipation hole is opened at the top of the outer shell.

[0023] Optionally, the heat sink includes at least one of thermal grease, a heat dissipation fan or a semiconductor refrigerator.

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

[0025] Optionally, a limit baffle is provided on the inner wall of the outer shell, and a limit block cooperating with the limit baffle is provided on the rotary valve stem to limit the rotation angle of the rotary valve stem.

[0026] Optionally, the inner wall of the housing 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] Optionally, the single layer thickness of the heat dissipation layer is 0.001 mm to 10 mm.

[0028] The beneficial effects that this application can achieve are as follows:

[0029] When the present application is in operation, the crankshaft rotates accordingly by rotating the valve stem forward or reversely, and due to the eccentric setting of the crankshaft relative to the rotating valve stem, the first bearing is driven to move left or right in the waist-shaped mounting hole inside the valve core, thereby pushing the valve core to move left or right accordingly in the valve sleeve, so that the annular sleeve on the valve core blocks the through holes at different positions of the valve sleeve, thereby forming different passages to control the flow and direction of the hydraulic oil, and finally controlling the hydraulic equipment to perform corresponding actions. In the process of the crankshaft controlling the movement of the valve core, the first bearing can cooperate with the rotation of the crankshaft. At the same time, the first bearing avoids the direct action of the crankshaft on the valve core, thereby greatly reducing wear and increasing service life. The first bearing is always in the waist-shaped mounting hole of the valve core and is not easy to fall off. The structure is compact and firm and stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following is a brief introduction to the drawings required for the specific embodiments or the prior art description. In all drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn according to the actual scale.

[0031] Figure 1 This is a schematic diagram of an exploded structure of a servo valve in an embodiment of the present application;

[0032] Figure 2 This is a schematic diagram of the internal structure of a servo valve in an embodiment of the present application;

[0033] Figure 3This is a schematic diagram of the outer surface structure of a servo valve in an embodiment of the present application;

[0034] Figure 4 It is a schematic diagram of the exploded structure of the valve assembly in the embodiment of the present application;

[0035] Figure 5 This is a schematic diagram of the assembly structure of the valve assembly in the embodiment of the present application;

[0036] Figure 6 is a schematic cross-sectional structural diagram of a valve assembly in an embodiment of the present application;

[0037] Figure 7 This is a schematic diagram of the connection structure of the rotary valve stem, the crankshaft and the support shaft in the embodiment of the present application;

[0038] Figure 8 It is a schematic diagram of the structure of the valve sleeve in the embodiment of the present application;

[0039] Fig. 9 It is a schematic diagram of the structure of the antler fluid channel nested inside the antler channel in the embodiment of the present application;

[0040] Fig.10 For the corresponding Fig. 9 Schematic diagram of the structure of the fluid channel in the middle antler from another perspective;

[0041] Fig.11 It is a schematic diagram of the working principle of each antler fluid channel (after disassembly) and hydraulic equipment;

[0042] Fig.12 This is a schematic diagram of the connection structure between the outer shell and the heat dissipation layer in an embodiment of the present application;

[0043] Fig.13 is a schematic diagram of the structure of a rod-shaped lattice in an embodiment of the present application;

[0044] Fig.14 is a schematic diagram of the structure of a plate-like lattice in an embodiment of the present application;

[0045] Fig.15 It is a schematic diagram of the structure of a continuous curved surface lattice in an embodiment of the present application;

[0046] Fig.16 FIG. 4 is another schematic diagram of the structure of the rod-shaped lattice in the embodiment of the present application.

[0047] Reference numerals:

[0048] 110-outer shell, 120-valve assembly, 121-rotating valve stem, 122-valve core, 1221-waist-shaped mounting hole, 1222-annular sleeve, 123-valve sleeve, 1231-slot hole, 1232-movable 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.

[0049] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0050] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

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

[0052] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0053] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "and / or" appearing in the full text includes three parallel schemes. Taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0054] Example

[0055] Reference Figure 1-Figure 15 The present embodiment provides a servo valve, including an outer shell 110, a valve assembly 120 is arranged in the outer shell 110, the valve assembly 120 is connected to a nested antler channel 130, and the nested antler channel 130 is used to connect the hydraulic equipment; wherein the valve assembly 120 includes a rotating valve stem 121, a valve core 122 and a valve sleeve 123, the axis of the rotating valve stem 121 and the axis of the valve core 122 are perpendicular to each other, the valve core 122 is coaxial and movably arranged in the valve sleeve 123, the bottom of the rotating valve stem 121 is connected to a crankshaft 124, the crankshaft 124 is sleeved with a first bearing 125, and the valve sleeve 1 23 is arranged in the nested antler channel 130, and a plurality of through holes for communicating with the nested antler channel 130 are opened on the valve sleeve 123 along the axial direction of the valve sleeve 123, and a movable groove 1232 cooperating with the crankshaft 124 is radially opened in the middle part of the valve sleeve 123, and a waist-shaped mounting hole 1221 cooperating with the first bearing 125 is opened inside the valve core 122, and the length direction of the waist-shaped mounting hole 1221 is perpendicular to the axial direction of the valve core 122, and at least one annular sleeve 1222 is fixedly sleeved on both sides of the mounting hole on the valve core 122, and the annular sleeve 1222 is used to block the through holes at different positions.

[0056] In this embodiment, during operation, the crankshaft 124 rotates correspondingly by rotating the valve stem 121 forward or reversely, and due to the eccentric arrangement of the crankshaft 124 relative to the rotating valve stem 121, the first bearing 125 is driven to move leftward or rightward in the waist-shaped mounting hole 1221 inside the valve core 122, thereby pushing the valve core 122 to move leftward or rightward in the valve sleeve 123 accordingly, 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 liquid The flow rate and direction of the pressurized oil ultimately control the hydraulic equipment to perform corresponding actions. In the process of the crankshaft 124 controlling the movement of the valve core 122, the first bearing 125 can cooperate with the rotation of the crankshaft 124. At the same time, the first bearing 125 avoids the crankshaft 124 from directly acting on the valve core 122, thereby greatly reducing wear and improving service life. The first bearing 125 is always in the waist-shaped mounting hole 1221 of the valve core 122 and is not easy to detach. The structure is compact, firm and stable, meeting the use requirements.

[0057] 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 cooperate with the revolution range of the crankshaft 124. When the axis of the crankshaft 124 rotates to the front and rear limit positions, it is just located at the front and rear end positions of the waist-shaped mounting hole 1221 in the length direction. When the axis of the crankshaft 124 rotates to the left and right limit positions, it can drive the valve core 122 to move to the left and right limit positions accordingly, so that the valve core 122 only moves left and right linearly; the first bearing 125 can be a radial contact bearing, an angular contact radial bearing, an axial contact bearing, or a radial contact bearing. Any one of the bearings or angular contact thrust bearings; the matching clearance between the first bearing 125 and the waist-shaped mounting hole 1221 is 0-20μm, preferably 0-10μm, where the gap size has a greater impact on the control accuracy, and reducing the gap can increase the control accuracy; the diameter of the valve core 122 is 1-100mm, preferably 2-70mm; 2-10 annular sleeves 1222 can be set on the valve core 122, and the wall thickness of the valve sleeve 123 is 0.5-20mm, preferably 0.6-2mm; the matching clearance between the annular sleeve 1222 and the valve sleeve 123 is 0-30μm , preferably 0 to 10 μm, where the size of the gap will affect the internal leakage, the smaller the gap, the smaller the leakage, and it can be designed according to the needs; the outer shell 110 can be formed by laser powder bed melting, electron beam powder bed melting, binder jetting, direct energy deposition, material extrusion, cold spraying, casting, forging or machining, and the outer shell 110 can be made of aluminum alloy, titanium alloy, high temperature alloy, stainless steel, mold steel, plastic or composite material, and the surface of the outer shell 110 is sandblasted, electroplated, sprayed, anodized, coated or painted; the valve sleeve 123, The valve core 122 and the crankshaft 124 can be formed by laser powder bed melting, electron beam powder bed melting, binder jetting, direct energy deposition, stereolithography, injection molding, cold spraying, casting, electromachining or mechanical processing; the valve sleeve 123, the valve core 122 and the 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, the valve core 122 and the crankshaft 124 can be subjected to one or more treatments of sand blasting, electroplating, spraying, anodizing, physical vapor deposition, chemical vapor deposition, coating or painting.

[0058] As an optional embodiment, the crankshaft 124 movably passes through the valve sleeve 123 and the valve core 122 and is connected to a support shaft 126. The axis of the support shaft 126 coincides with the axis of the rotating valve stem 121. A second bearing 127 is sleeved on the support shaft 126. The support shaft 126 is movably connected to the bottom of the nested antler channel 130 through the second bearing 127.

[0059] In this embodiment, by designing the crankshaft 124 to pass through the valve sleeve 123 and the valve core 122, the valve core 122 is driven to move through the middle of the crankshaft 124. Compared with driving the valve core 122 through the end of the crankshaft 124, the force applied to the valve core 122 is smaller and the risk of breakage is less likely to occur, thereby further improving the service life. At the same time, the support shaft 126 and the second bearing 127 can cooperate to support the crankshaft 124 and the rotating valve stem 121, thereby having good operating stability and low wear.

[0060] As an optional embodiment, a third bearing 128 is sleeved on the rotating valve stem 121, and the third bearing 128 is movably embedded in the top of the nested antler channel 130. The third bearing 128 can rotate in conjunction with the rotating valve stem 121 while supporting it on the nested antler channel 130, thereby further improving the operating stability and reducing wear.

[0061] As an optional embodiment, a plurality of antler fluid channels are opened in the nested antler channel 130, each of which includes a main branch 131 for connecting to a hydraulic device, the main branch 131 is connected to a plurality of first branches 132, the first branches 132 are each connected to a plurality of second branches 133, and the second branches 133 are used to connect to corresponding through holes.

[0062] In this embodiment, the multiple antler fluid channels opened in the nested antler channel 130 can flow through different hydraulic oil passages respectively. At the same time, the hydraulic oil can be evenly divided into multiple strands and connected to the corresponding through holes through the first branch 132 and the second branch 133, so that the valve core 122 is evenly stressed and the drive is more stable.

[0063] 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, which can be designed according to actual needs; the wall thickness of the antler fluid channel is 0.1 to 5 mm, which can be a uniform wall thickness or a non-uniform wall thickness, wherein the non-uniform wall thickness variation ratio is 20% to 80%; the nested antler channel 130 can be formed by laser powder bed melting, electron beam powder bed melting, binder injection, 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 is sandblasted, electroplated, sprayed, anodized or coated; the inner wall of the nested antler channel 130 is subjected to one or more of ultrasonic cleaning, abrasive flow, water particle flow, magnetic grinding, chemical polishing or oil cleaning.

[0064] Several methods for forming the nested antler channel 130 are specifically introduced below:

[0065] (1) When the nested antler channel 130 is formed by laser powder bed fusion, the forming method includes the following steps:

[0066] Step S1: batching, sieving, drying, and loading the powder into a manufacturing environment equipped with a forming platform;

[0067] Step S2: preheating the forming platform and replacing the manufacturing environment with inert gas;

[0068] Step S3: spreading powder on the surface of the forming platform, and then scanning and sintering a local area of ​​the powder layer by laser;

[0069] Step S4: The forming platform descends by one layer thickness, and step S3 is repeated until the three-dimensional nested antler channel 130 is formed.

[0070] (2) When the nested antler channel 130 is formed by electron beam powder bed melting, the forming method includes the following steps:

[0071] Step S1: batching, sieving, drying, and loading the powder into a manufacturing environment equipped with a forming platform;

[0072] Step S2: preheating the forming platform and evacuating the manufacturing environment;

[0073] Step S3: spreading powder on the surface of the forming platform, and then heating the powder layer area by electron beam scanning;

[0074] Step S4: Scanning and sintering a local area of ​​the powder layer by electron beam;

[0075] Step S5: The sintering area is kept warm for a certain period of time, and the forming platform is lowered by one layer thickness;

[0076] Step S6: Repeat steps S3 to S5 until the three-dimensional nested antler channel 130 is formed.

[0077] (3) When the nested antler channel 130 is formed by adhesive injection, the forming method includes the following steps:

[0078] Step S1: batching, sieving, drying, and loading the powder into a manufacturing environment equipped with a forming platform;

[0079] Step S2: Spreading powder on the surface of the forming platform and compacting the powder, using a nozzle to spray the binder on the surface of the powder layer according to the cross section of the current layer model, bonding the powder particles together to form a layer of solid structure;

[0080] Step S3: the forming platform is lowered by one layer thickness, and step S2 is repeated until the three-dimensional nested antler channels 130 are bonded to form a printed blank;

[0081] Step S4: The printed blank is solidified by drying or chemical reaction to complete the formation of the three-dimensional nested antler channel 130.

[0082] (4) When the nested antler channel 130 is formed by casting, the forming method includes the following steps:

[0083] Step S1: melting the material of the casting to form molten metal;

[0084] Step S2: pouring the molten metal into the mold, entering the mold cavity through the gate, and filling the entire mold cavity;

[0085] Step S3: After the metal filling is completed, wait for a certain period of time for the metal to cool and solidify;

[0086] Step S4: After the casting is completely cooled, the mold is disassembled to complete the formation of the three-dimensional nested antler channel 130.

[0087] As an optional embodiment, 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 branch 132 is greater than or equal to the sum of the cross-sectional areas of the corresponding second branches 133, thereby preventing flow saturation.

[0088] As an optional embodiment, the valve sleeve 123 is provided with X groups of through holes arranged axially, and each group of through holes includes Y pairs of slots 1231 radially distributed along the valve sleeve 123; wherein, the range of X is 3 to 20, the range of Y is 1 to 15, and the spacing between adjacent groups of through holes is 0 to 10 mm, which can be designed according to actual usage requirements.

[0089] As an optional implementation, assuming that the cross-sectional area of ​​the main branch 131 is S, then S≥K1*h*b*Y; wherein K1 is a multiple, and K1 is 2 to 16, h is the moving distance of the valve core 122, and b is the width of the slot 1231; assuming that the difference in cross-sectional area between the annular sleeve 1222 and the valve core 122 is ΔS, then ΔS≥K2*h*b*Y; wherein K2 is a multiple, and K2 is 2 to 10, thereby preventing flow saturation.

[0090] As an optional embodiment, it is assumed that when the crankshaft 124 rotates forward and drives the valve core 122 to slide to the left limit position inside the valve sleeve 123, the group A through holes can be opened. When the crankshaft 124 rotates reversely and drives the valve core 122 to slide to the right limit position inside the valve sleeve 123, the group B through holes can be opened. Among them, the ranges of A and B are both 2 to (X-1), thereby ensuring that a passage can be formed when the valve core 122 moves to the limit position.

[0091] As an optional embodiment, the shape of the slot 1231 is at least one of a waist shape, a circle, a polygon (such as a rectangle, a pentagon, etc.), a star shape or an irregular shape (such as an irregular polygon), and can be designed according to actual needs.

[0092] As an optional embodiment, a receiving cavity for receiving the valve sleeve 123 is provided in the nested antler channel 130, and a mounting port communicating with the receiving cavity is provided on one side of the nested antler channel 130. A sealing cover 140 is detachably connected (e.g., threaded or screwed) to the mounting port to facilitate assembly of the valve sleeve 123. After assembly, the sealing cover 140 is installed on the mounting port to fix the valve sleeve 123 in the nested antler channel 130 to prevent it from moving. It should be noted that the matching clearance between the valve sleeve 123 and the receiving cavity is -20 to 20 μm, preferably -10 to 10 μm. The size of the clearance affects the internal leakage. In principle, the smaller the better, and it can be selected according to design requirements.

[0093] The assembly method of the valve sleeve 123 and the nested antler channel 130 is: freeze the 3D printed valve sleeve 123 to reduce the size of the valve sleeve 123; embed the valve sleeve 123 into the accommodating cavity of the nested antler channel 130 at room temperature; wait for the valve sleeve 123 to return to room temperature, and complete the interference fit and lossless assembly.

[0094] As an optional embodiment, the solid part of the nested antler channel 130 is a lattice structure, and the lattice structure is any one of a rod-shaped lattice, a plate-shaped lattice or a continuous curved surface lattice, so as to achieve the purpose of weight reduction, making the entire servo valve lighter and reducing material costs. The weight reduction ratio can be set at 0.5% to 99.5%.

[0095] It should be noted that the rod-shaped lattice can be set into a variable density structure (such as Fig.16 As shown in the figure, a rod-shaped lattice with variable density can be constructed by taking the 3D stress map of the part as input, which can convert the stress map into a material density map. The generated lattice has a larger density in areas with greater stress and a smaller density in areas with less stress, thereby improving the uniformity of stress resistance.

[0096] As an optional implementation, an electric motor 150 for driving the rotary valve stem 121 to rotate is disposed in the outer shell 110 . The electric motor 150 is electrically connected to a circuit board 160 , and an angular displacement sensor is disposed on the circuit board 160 .

[0097] In this embodiment, the circuit board 160 can drive the electric motor 150 to operate after receiving the signal, and 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, compare the difference between the rotation angle of the crankshaft 124 and the input signal in real time, dynamically adjust the rotation speed and position of the crankshaft 124, and realize closed-loop control.

[0098] It should be noted that the diameter of the electric motor 150 is 5 to 200 mm and the height is 5 to 200 mm. The electric motor 150 is composed of a stator and a rotor. The rotor can form an integrated structure with the rotating valve stem 121. The thermal conductivity of the stator of the electric motor 150 can be increased by a glue filling process; the angular displacement sensor can adopt any one of a capacitive encoder, a photoelectric encoder, a magnetic encoder, a Hall sensor, an inductive sensor, a resistive sensor, a micro-electromechanical system sensor or a laser sensor; the number of layers of the circuit board 160 is 1 to 20 layers, which can be designed according to requirements; the side wall of the outer shell 110 is provided with a connector for powering and communicating signals with external devices.

[0099] As an optional embodiment, a heat sink 170 is arranged above the circuit board 160. The heat sink 170 is located at the top of the outer shell 110. The top of the outer shell 110 is provided with heat dissipation holes. The setting of the heat sink 170 and the heat dissipation holes can dissipate the heat of the circuit board 160, thereby ensuring that the circuit board 160 can operate efficiently.

[0100] As an optional implementation, the heat sink 170 includes at least one of thermal grease, a heat dissipation fan or a semiconductor refrigerator, all of which can meet the heat dissipation requirements. Other suitable heat sinks 170 may also be used.

[0101] As an optional implementation, the eccentricity of the crankshaft 124 relative to the rotating valve stem 121 is 0.1 to 20 mm, preferably 0.5 to 2.5 mm, and can be designed according to actual usage requirements.

[0102] As an optional embodiment, a limit baffle is provided on the inner wall of the outer shell 110, and a limit block 180 cooperating with the limit baffle is provided on the rotating valve stem 121 to limit the rotation angle of the rotating valve stem 121, thereby limiting the rotation angle of the crankshaft 124. The limited rotation angle of the crankshaft 124 here is 0 to 180°, preferably 10° to 170°.

[0103] As an optional embodiment, at least one heat dissipation layer 190 is provided on the inner wall of the outer shell 110. 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. It can dissipate the heat generated by the components inside the outer shell 110 during operation, thereby reducing the failure rate.

[0104] It should be noted that the processing technology of the heat dissipation layer 190 adopts at least one of hot extrusion, direct energy deposition, coating, electroplating, chemical plating, hot dip plating, cold spraying, vapor deposition or thermal spraying; the number of layers of the heat dissipation layer 190 is ≥ 1, preferably 1 to 5 layers; the single layer thickness of the heat dissipation layer 190 is 0.001mm to 10mm, preferably 0.01mm to 0.5mm.

[0105] As an optional embodiment, in order to improve the surface strength of the outer shell 110 and the nested antler channel 130, a reinforcing texture can be set on the outer wall of the shell 110 and the nested antler channel 130. The reinforcing texture can adopt at least one of triangular texture, square texture, hexagonal texture, octagonal texture, rhombus dodecahedron texture, double-angle tensile texture, single-angle tensile texture or random texture.

[0106] It should be noted that each sealing part in the servo valve of this embodiment needs to use a sealing ring, which can be composed of an O-ring and a retaining ring. The O-ring can 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 its hardness is 70 to 100HA; the retaining ring can be made of polytetrafluoroethylene, nylon 6, nylon 1010, and its hardness is greater than or equal to 90HS.

[0107] The working principle of the present application is explained below with reference to an example: here, four groups of antler fluid channels can be set, namely, antler fluid channel E, antler fluid channel O, antler fluid channel Y1 and antler fluid channel Y2; wherein antler fluid channel E has one main branch 131, eight first branches 132 and sixteen second branches 133, antler fluid channel O has one main branch 131, four first branches 132 and sixteen second branches 133, antler fluid channel Y1 and antler fluid channel Y2 both have one main branch 131, two first branches 132 and eight second branches 133; the main branch 131 of antler fluid channel E is connected to the hydraulic pump, and antler fluid channel The main branch 131 of channel O is connected to the oil source, and the antler fluid channel Y1 and the antler fluid channel Y2 are respectively connected to the oil inlet and oil return port of the hydraulic equipment (such as a hydraulic cylinder); the valve sleeve 123123 is provided with two groups of through holes a, one group of through holes b, one group of through holes c and two groups of through holes d, each group of through holes a has 8 slots 1231, which are respectively connected to the second branches 133 corresponding to the antler fluid channel E, the through holes b and the through holes c both have 8 slots 1231, which are respectively connected to the corresponding second branches 133 of the antler fluid channel Y1 and the antler fluid channel Y2, and each group of through holes d has 8 slots 1231, which are respectively connected to the second branches 133 of the antler fluid channel O. After being assembled correctly 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 is mainly to calculate the current control signal according to the target position given by the hydraulic system, and after D / A conversion, it is transmitted to the servo amplifier to drive the electric motor 150 to rotate the crankshaft 124 forward or reverse. The angular displacement sensor collects the current rotation angle of the crankshaft 124 and feeds it back to the circuit board 160, and compares the difference between the rotation angle of the crankshaft 124 and the input signal in real time, and dynamically adjusts the rotation speed and position of the crankshaft 124 to realize closed-loop control; by rotating the crankshaft 124 forward and reversely Thereby, the valve core 122 is driven to move in the forward and reverse directions. When the crankshaft 124 rotates forward and drives the valve core 122 to slide to the left inside the valve sleeve 123, the antler fluid channel E and the antler fluid channel Y2 form a passage, and the antler fluid channel O and the antler fluid channel Y1 form a passage, so that the push rod of the actuator in the hydraulic equipment moves to the right. When the crankshaft 124 rotates reversely and drives the valve core 122 to slide to the right inside the valve sleeve 123, the antler fluid channel E and the antler fluid channel Y1 form a passage, and the antler fluid channel O and the antler fluid channel Y2 form a passage, so that the push rod of the actuator moves to the left, thereby realizing the action execution control of the hydraulic equipment.

[0108] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A servo valve, characterized in that: It comprises an outer shell, wherein a valve assembly is arranged in the outer shell, and the valve assembly is connected with a nested antler channel, and the nested antler channel is used to connect the hydraulic equipment; wherein, The valve assembly includes a rotating valve stem, a valve core and a valve sleeve. The axis of the rotating valve stem is perpendicular to the axis of the valve core. The valve core is coaxial and movably arranged in the valve sleeve. The bottom of the rotating valve stem is connected to a crankshaft, and a first bearing is sleeved on the crankshaft. The valve sleeve is arranged in the nested antler channel. The valve sleeve is provided with a plurality of through holes for communicating with the nested antler channel along the axial direction of the valve sleeve. A movable groove cooperating with the crankshaft is radially provided in the middle part of the valve sleeve. A waist-shaped mounting hole cooperating with the first bearing is provided inside the valve core. The length direction of the waist-shaped mounting hole is perpendicular to the axial direction of the valve core. At least one annular sleeve is fixedly provided on both sides of the mounting hole on the valve core, and the annular sleeve is used to seal the through holes at different positions.

2. A servo valve according to claim 1, characterized in that: The crankshaft simultaneously moves through the valve sleeve and the valve core and is connected to a support shaft, the axis of the support shaft coincides with the axis of the rotating valve stem, a second bearing is sleeved on the support shaft, and the support shaft is movably connected to the bottom of the nested antler channel through the second bearing.

3. A servo valve according to claim 1 or 2, characterized in that: The rotating valve stem is sleeved with a third bearing, and the third bearing is movably embedded in the top of the nested antler channel.

4. A servo valve as claimed in claim 1, characterized in that: The matching clearance between the first bearing and the waist-shaped mounting hole is 0-20 μm.

5. A servo valve as claimed in claim 1, characterized in that: The matching clearance between the annular sleeve and the valve sleeve is 0-30 μm.

6. A servo valve according to claim 1, characterized in that: A plurality of antler fluid channels are provided in the nested antler channel, and each of the antler fluid channels includes a main branch for connecting to a hydraulic device, the main branch is connected to a plurality of first branches, the first branches are connected to a plurality of second branches, and the second branches are used to connect to the corresponding through holes.

7. A servo valve according to claim 6, characterized in that: 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, 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.

8. A servo valve as claimed in claim 6, characterized in that: Assume that the valve sleeve is axially arranged with X groups of through holes, each group of through holes includes Y pairs of slots distributed radially along the valve sleeve; wherein the range of X is 3-20, and the range of Y is 1-15.

9. A servo valve as claimed in claim 8, characterized in that: Assuming that the cross-sectional area of ​​the main branch is S, then S≥K1*h*b*Y; wherein K1 is a multiple, and K1 is 2 to 16, h is the moving distance of the valve core, and b is the width of the slot; Assuming that the difference between the cross-sectional areas of the annular sleeve and the valve core is ΔS, then ΔS≥K2*h*b*Y; wherein K2 is a multiple, and K2 is 2-10.

10. A servo valve as claimed in claim 8, characterized in that: Assume that when the crankshaft rotates forward and drives the valve core to slide to the left limit position inside the valve sleeve, the through holes in group A can be opened; when the crankshaft rotates reversely and drives the valve core to slide to the right limit position inside the valve sleeve, the through holes in group B can be opened; wherein the ranges of A and B are both 2 to (X-1).

11. A servo valve according to claim 8, characterized in that: The shape of the slot is at least one of a waist shape, a circle, a polygon, a star shape or an irregular shape.

12. A servo valve according to claim 1 or 6, characterized in that: A receiving cavity for receiving the valve sleeve is provided in the nested antler channel, and a mounting port communicating with the receiving cavity is provided on one side of the nested antler channel, and a sealing cover is detachably connected to the mounting port.

13. A servo valve according to claim 12, characterized in that: The matching clearance between the valve sleeve and the accommodating cavity is -20 to 20 μm.

14. A servo valve according to claim 1 or 6, characterized in that: The solid part of the nested antler channel is a lattice structure.

15. A servo valve according to claim 14, characterized in that: The lattice structure is any one of a rod-shaped lattice, a plate-shaped lattice or a continuous curved surface lattice.

16. A servo valve according to claim 1, characterized in that: An electric motor for driving the rotary valve stem to rotate is disposed in the outer shell. The electric motor is electrically connected to a circuit board, and an angular displacement sensor is disposed on the circuit board.

17. A servo valve according to claim 16, characterized in that: A radiator is arranged above the circuit board, and the radiator is located at the top of the outer shell. A heat dissipation hole is opened at the top of the outer shell.

18. A servo valve according to claim 17, characterized in that: The heat sink includes at least one of thermal grease, a heat dissipation fan or a semiconductor refrigerator.

19. A servo valve according to claim 1, characterized in that: The eccentricity of the crankshaft relative to the rotary valve stem is 0.1 to 20 mm.

20. A servo valve as claimed in claim 1, characterized in that: The inner wall of the outer shell is provided with a limit baffle, and the rotary valve stem is provided with a limit block matched with the limit baffle to limit the rotation angle of the rotary valve stem.

21. A servo valve as claimed in claim 1, characterized in that: The inner wall of the housing 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. A servo valve according to claim 21, characterized in that: The single layer thickness of the heat dissipation layer is 0.001 mm to 10 mm.

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