CN117366285A - Two-dimensional electrohydraulic servo valve based on dry-wet separation transmission mechanism - Google Patents
Two-dimensional electrohydraulic servo valve based on dry-wet separation transmission mechanism Download PDFInfo
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- CN117366285A CN117366285A CN202311534554.5A CN202311534554A CN117366285A CN 117366285 A CN117366285 A CN 117366285A CN 202311534554 A CN202311534554 A CN 202311534554A CN 117366285 A CN117366285 A CN 117366285A
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- 230000007246 mechanism Effects 0.000 title claims abstract description 107
- 230000005540 biological transmission Effects 0.000 title claims abstract description 47
- 238000000926 separation method Methods 0.000 title claims abstract description 17
- 230000009347 mechanical transmission Effects 0.000 claims abstract description 19
- 238000000034 method Methods 0.000 claims abstract description 11
- 238000007789 sealing Methods 0.000 claims description 26
- 229910000831 Steel Inorganic materials 0.000 claims description 18
- 239000010959 steel Substances 0.000 claims description 18
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000003921 oil Substances 0.000 abstract description 10
- 230000008569 process Effects 0.000 abstract description 8
- 239000010720 hydraulic oil Substances 0.000 abstract description 7
- 230000003321 amplification Effects 0.000 description 6
- 238000003199 nucleic acid amplification method Methods 0.000 description 6
- 230000033001 locomotion Effects 0.000 description 5
- 238000001125 extrusion Methods 0.000 description 4
- 230000004044 response Effects 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000003756 stirring Methods 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004377 microelectronic Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K11/00—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves
- F16K11/02—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit
- F16K11/08—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only taps or cocks
- F16K11/085—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only taps or cocks with cylindrical plug
- F16K11/0853—Multiple-way valves, e.g. mixing valves; Pipe fittings incorporating such valves with all movable sealing faces moving as one unit comprising only taps or cocks with cylindrical plug having all the connecting conduits situated in a single plane perpendicular to the axis of the plug
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
Abstract
The invention provides a two-dimensional electro-hydraulic servo valve based on a dry-wet separation transmission mechanism, which comprises a valve main body, wherein the valve main body is connected with a motor through a mechanical transmission mechanism; the valve body comprises a valve core, a valve sleeve and a valve body; the mechanical transmission mechanism comprises a shell arranged between the valve main body and the motor, a wet-type operation cavity and a dry-type operation cavity are arranged in the shell, and the wet-type operation cavity is communicated with an oil circuit in the valve main body; the dry type operation cavity is arranged at one side of the wet type operation cavity, and a rotor of the motor stretches into the dry type operation cavity; the mechanical transmission mechanism also comprises a transmission assembly, and the transmission mechanism comprises a primary moment amplifying mechanism and a secondary moment amplifying mechanism which are connected. The wet type operation cavity solves the problems of high-pressure dynamic seal friction loss and short service life of the existing two-dimensional electro-hydraulic servo valve structure; meanwhile, a dry-type operation cavity is arranged, so that hydraulic oil is not in direct contact with the motor; the transmission component amplifies the output torque of the motor and overcomes the multi-directional resistance received in the working process of the valve body.
Description
Technical Field
The invention relates to the technical field of electrohydraulic servo valves, in particular to a two-dimensional electrohydraulic servo valve based on a dry-wet separation transmission mechanism.
Background
The electrohydraulic servo valve is a high-end precision product developed by combining a microelectronic technology and a hydraulic technology, and is commonly used in the fields of aerospace, military industry and national large-scale high-end equipment, such as an airplane brake system, a rolling mill force application system and the like due to the advantages of quick dynamic response, high control precision, long service life and the like.
The two-dimensional electrohydraulic servo valve is developed by the Zhejiang university of industry team through more than 20 years of efforts by improving the structure of the traditional servo valve. The two-dimensional electrohydraulic servo valve is designed by the principle of double freedom of movement (direct motion and rotation) of the valve core. In control, the two-dimensional electrohydraulic servo valve adopts an embedded system, and achieves the control purpose by a brand new digital control method. The two-dimensional electrohydraulic servo valve is a feedback system (current feedback and position feedback) adopting a high-speed DSP chip under closed-loop control, and has greatly improved linearity, hysteresis and repeatability and performance of an open-loop model. The two-dimensional electrohydraulic servo valve has the characteristics of simple structure, small volume (adopting a two-dimensional servo screw mechanism), strong pollution resistance (integrating main control, guide and control, and having two effects of direct motion and rotation), high response speed, high control precision (the flow of the 10-path servo valve can reach 100L/min, and the dynamic frequency response can reach 150 Hz) and the like.
The current two-dimensional electrohydraulic servo valve generally drives a transmission mechanism through a motor, the transmission mechanism transmits the rotation of the motor to a valve core, the valve core rotates to change the size of an arch gap between a high-low pressure hole and a spiral groove, and the balance of a resistance half-bridge is broken, so that the valve core generates axial movement under the action of hydraulic unbalance force. Sealing between the valve core and the transmission mechanism is completed by adopting a sealing ring in the current two-dimensional electro-hydraulic servo valve structure, so that hydraulic oil is ensured not to contact with the motor. However, the sealing ring is required to bear both axial friction with the valve core and rotational abrasion of the valve core. Therefore, the existing two-dimensional electro-hydraulic servo valve structure has the problems of high-pressure dynamic seal friction loss and short service life.
Furthermore, the valve body needs to overcome multiple resistances in the working process, such as friction force between the valve core and the valve sleeve, tangential hydrodynamic force between the oil through port of the valve body and hydraulic oil, oil stirring resistance and the like. However, the existing transmission mechanism has the defects of insufficient magnification factor of motor moment and driving force cannot meet the condition of multiple resistances which need to be overcome in the working process of the valve body.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention aims to provide a two-dimensional electro-hydraulic servo valve based on a dry-wet separation transmission mechanism. The wet type operation cavity solves the problems of high-pressure dynamic seal friction loss and short service life of the existing two-dimensional electro-hydraulic servo valve structure; meanwhile, a dry-type operation cavity is arranged, so that hydraulic oil is not in direct contact with the motor; the output torque of the motor is amplified through the transmission component, and the multiparty resistance of the valve body in the working process is overcome.
In order to solve the technical problems, the invention is realized by the following technical scheme:
a two-dimensional electrohydraulic servo valve based on a dry-wet separation transmission mechanism comprises a valve main body, wherein the valve main body is connected with a motor through a mechanical transmission mechanism; the valve body comprises a valve core, a valve sleeve and a valve body, the valve sleeve is coaxially sleeved outside the valve core, the valve core and the valve sleeve can slide and rotate relatively, and the valve body is coaxially sleeved outside the valve sleeve; the method is characterized in that:
the mechanical transmission mechanism comprises a shell arranged between the valve main body and the motor, a wet-type operation cavity and a dry-type operation cavity are arranged in the shell, and the wet-type operation cavity is communicated with an oil way in the valve main body; the dry-type operation cavity is arranged at one side of the wet-type operation cavity, and a rotor of the motor stretches into the dry-type operation cavity;
the mechanical transmission mechanism further comprises a transmission assembly, the transmission assembly comprises a primary moment amplifying mechanism and a secondary moment amplifying mechanism which are connected, the primary moment amplifying mechanism is arranged in the dry-type operation cavity and connected with the rotor, and the secondary moment amplifying mechanism is arranged in the wet-type operation cavity and connected with the valve core.
Further: the primary torque amplifying mechanism comprises a motor ball and a crankshaft shifting fork, the motor ball is arranged in a shifting fork groove of the crankshaft shifting fork, the motor ball is connected with the rotor through a ball connecting piece, and the crankshaft shifting fork is connected with the secondary torque amplifying mechanism.
Further: the secondary moment amplifying mechanism comprises a crankshaft and a valve core middle shifting fork, a shaft neck of the crankshaft is arranged in a shifting fork groove of the valve core middle shifting fork, one end of the crankshaft stretches into the dry-type operation cavity to be connected with the primary moment amplifying mechanism, and the valve core middle shifting fork is connected with the valve core.
Further: the shell comprises a wet connecting sleeve, a dry connecting sleeve and an intermediate connecting sleeve, wherein the intermediate connecting sleeve is arranged between the wet connecting sleeve and the dry connecting sleeve, the wet operating cavity is arranged in the wet connecting sleeve, and the dry operating cavity is arranged in the dry connecting sleeve.
Further: the rotary reset magnetic steel is sleeved on the rotor and comprises a first reset magnetic steel fixed on the extending end of the rotor and a second reset magnetic steel fixed on the inner cylinder wall of the dry connecting sleeve.
Further: the dry connecting sleeve is arranged as a cylinder and is rotatably connected with the middle connecting sleeve, and zero-setting holes are formed in the wall surface of the outer cylinder on the side surface of the dry connecting sleeve.
Further: the two ends of the secondary torque amplifying mechanism are correspondingly sleeved with sealing positioning structures, the secondary torque amplifying mechanism is rotatably connected with the sealing positioning structures, an opening groove is formed in the wet connecting sleeve in a penetrating mode, the sealing positioning structures are embedded in the wet connecting sleeve through the opening groove, and one end of the secondary torque amplifying mechanism extends into the dry operating cavity through the opening groove to be connected with the primary torque amplifying mechanism.
Further: the secondary moment amplifying mechanism, the valve body and the sealing positioning structure far away from the primary moment amplifying mechanism form a balance cavity, and the balance cavity and the dry-type operation cavity balance the pressure of the secondary moment amplifying mechanism.
Further: the valve core is fixedly connected with the secondary moment amplifying mechanism through a valve core transmission rod, and the valve core transmission rod extends into the valve core and is fixedly connected with the valve core.
Compared with the prior art, the invention has the following advantages:
1. the wet type operation cavity solves the problems of high-pressure dynamic seal friction loss and short service life of the existing two-dimensional electro-hydraulic servo valve structure; meanwhile, a dry-type operation cavity is arranged, so that hydraulic oil is not in direct contact with the motor; the output torque of the motor is amplified in multiple stages through the transmission assembly, so that the friction force, tangential hydraulic force, oil stirring resistance and the like of a sealing ring, which are received by the valve body in the working process, are overcome.
2. The primary torque amplifying mechanism and the secondary torque amplifying mechanism of the invention amplify the output torque of the motor by multiple, and the torque finally output to the valve core is the product number of the amplification factors of the primary torque amplifying mechanism and the secondary torque amplifying mechanism, so that the output torque of the motor required by the rotation of the valve core can be reduced, a small motor can be selected, the whole weight of the two-dimensional electrohydraulic servo valve is reduced, the volume is reduced, and the cost is saved.
3. The balance cavity is formed by the secondary moment amplifying mechanism, the valve body and the sealing positioning structure, and the balance cavity and the dry-type operation cavity balance the pressure of the secondary moment amplifying mechanism, so that the axial side force of the primary moment amplifying mechanism can be prevented from acting on the crankshaft to enable the crankshaft to axially displace and deform.
4. According to the invention, the rotary reset magnetic steel and the zero setting hole are arranged on the dry connecting sleeve, and when the valve body, the mechanical transmission mechanism and the motor are assembled, the zero position of the valve core deviates, or the valve core rotates to deviate from the initial zero position in the working process of the valve body, the valve core can be manually zeroed.
Drawings
FIG. 1 is a schematic view of the external structure of the present invention;
FIG. 2 is a schematic diagram of a typical cross-sectional structure of the present invention;
FIG. 3 is a schematic diagram of a typical cross-sectional structure of the present invention;
FIG. 4 is a schematic view of the mechanical transmission mechanism of the present invention;
FIG. 5 is a schematic view of the wet connect sleeve of the present invention;
fig. 6 is a cross-sectional view of the valve sleeve of the present invention;
FIG. 7 is a schematic view of the structure of the valve cartridge of the present invention;
fig. 8 is an exploded view of the mechanical transmission of the present invention.
Reference numerals: 1-a valve body; 2-a mechanical transmission mechanism; 3-an electric motor; 4-valve core; 5-valve sleeve; 6-a valve body; 7-a housing; 8-a wet operation chamber; 9-a dry operating chamber; 10-rotor; 11-a transmission assembly; 12-a primary moment amplifying mechanism; 13-a secondary moment amplifying mechanism; 14-motor ball head; 15-a crankshaft fork; 16-a shifting fork groove of a crankshaft shifting fork; 17-ball joint connection; 18-a crankshaft; 19-a valve core middle shifting fork; 20-journal; 21-a shifting fork groove of a shifting fork in the middle of the valve core; 22-wet type connecting sleeve; 23-a dry connecting sleeve; 24-an intermediate connecting sleeve; 25-socket head cap screws; 26-a first reset magnetic steel; 27-a second reset magnetic steel; 28-zeroing holes; 29-a seal positioning structure; 30-open slot; 31-balancing the cavity; 32-a valve core transmission rod; 33-bearings; 34-sealing rings; 35-high pressure waist grooves; 36-low pressure waist-shaped grooves; 37-connecting rod; 38-sensitive cavity channel; 39-sensitive cavity; 40-high pressure chamber; 41-a valve core low-pressure flow passage; 42-valve core transmission rod runner.
Detailed Description
In order that those skilled in the art will better understand the technical solutions of the present invention, preferred embodiments of the present invention will be described below with reference to specific examples, but it should be understood that the drawings are for illustrative purposes only and should not be construed as limiting the present invention; for the purpose of better illustrating the embodiments, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the actual product dimensions; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted. The positional relationship described in the drawings are for illustrative purposes only and are not to be construed as limiting the invention.
The invention is further illustrated by the following figures and examples, which are not intended to be limiting.
As shown in fig. 1 to 8, a two-dimensional electro-hydraulic servo valve based on a dry-wet separation transmission mechanism comprises a valve main body 1, wherein the valve main body 1 is connected with a motor 3 through a mechanical transmission mechanism 2; the valve body 1 comprises a valve core 4, a valve sleeve 5 and a valve body 6, wherein the valve sleeve 5 is coaxially sleeved outside the valve core 4, the valve core 4 and the valve sleeve 5 can slide and rotate relatively, and the valve body 6 is coaxially sleeved outside the valve sleeve 5.
The mechanical transmission mechanism 2 comprises a shell 7 arranged between the valve main body 1 and the motor 3, a wet operation cavity 8 and a dry operation cavity 9 are arranged in the shell 7, and the wet operation cavity 8 is communicated with an oil way in the valve main body 1; the dry operating chamber 9 is disposed at one side of the wet operating chamber 8, and the rotor 10 of the motor 3 protrudes into the dry operating chamber 9.
The mechanical transmission mechanism 2 further comprises a transmission assembly 11, the transmission mechanism 11 comprises a primary moment amplifying mechanism 12 and a secondary moment amplifying mechanism 13 which are connected, the primary moment amplifying mechanism 12 is arranged in the dry-type operation cavity 9 and is connected with the rotor 10, and the secondary moment amplifying mechanism 13 is arranged in the wet-type operation cavity 8 and is connected with the valve core 4.
The primary torque amplifying mechanism 12 comprises a motor ball head 14 and a crankshaft shifting fork 15, the motor ball head 14 is arranged in a shifting fork groove 16 of the crankshaft shifting fork, the motor ball head 14 is connected with the rotor 10 through a ball head connecting piece 17, and the crankshaft shifting fork 15 is connected with the secondary torque amplifying mechanism 13.
The secondary torque amplifying mechanism 13 comprises a crankshaft 18 and a valve core middle shifting fork 19, the crankshaft 18 is provided with three sections, namely a journal 20 and connecting rods 37 at two ends of the journal 20, the journal 20 of the crankshaft 18 is arranged in a shifting fork groove 21 of the valve core middle shifting fork, one end of the crankshaft 18 stretches into the dry-type operating cavity 9 to be connected with the primary torque amplifying mechanism 12, and the valve core middle shifting fork 19 is connected with the valve core 4.
The opening of the fork groove 16 of the crank fork is arranged opposite to the opening of the fork groove 21 of the valve core middle fork, and in the embodiment, the opening of the fork groove 16 of the crank fork is arranged upwards, and the opening of the fork groove 21 of the valve core middle fork is arranged downwards. The journal 20 opening of the crankshaft 18 is arranged opposite to the opening of the fork groove 21 of the middle fork of the valve core, namely, the journal 20 opening is arranged upwards. Therefore, the whole second-stage torque amplifying mechanism 13 is arranged at the lower part of the wet-type operation cavity 8, namely, the whole second-stage torque amplifying mechanism is downwards arranged, and is more stable and reliable in the state of no external force, no oil and no work.
The primary moment amplifying mechanism 12 and the secondary moment amplifying mechanism 13 each multiply and amplify the output moment of the motor 3, and the moment finally output to the valve core 4 is the multiplication and accumulation number of the amplification times of the primary moment amplifying mechanism 12 and the secondary moment amplifying mechanism 13.
The invention can amplify the output torque of the motor 3 by multiple stages, and reduce the output torque of the motor 3 required by the rotation of the valve core 4, thereby selecting a small motor 3, reducing the overall weight of the two-dimensional electrohydraulic servo valve, reducing the volume and saving the cost.
After the output torque of the motor 3 is amplified by multiple stages, the driving force of the valve core 4 is larger under the condition of a certain load, and the response speed of the two-dimensional electro-hydraulic servo valve is improved.
The wet type operation cavity 8 is arranged, so that the problems of high-pressure dynamic seal friction loss and short service life of the existing two-dimensional electro-hydraulic servo valve structure are solved; meanwhile, a dry-type operation cavity 9 is arranged to ensure that hydraulic oil is not in direct contact with the motor 3; the output torque of the motor 3 is amplified through the transmission assembly 11, and the friction force, tangential hydraulic force, oil stirring resistance and the like of the sealing ring, which are applied to the valve body 6 in the working process, are overcome.
The housing 7 comprises a wet connection sleeve 22, a dry connection sleeve 23 and an intermediate connection sleeve 24, the intermediate connection sleeve 24 being arranged between the wet connection sleeve 22 and the dry connection sleeve 23, the wet operation chamber 8 being located in the wet connection sleeve 22 and the dry operation chamber 9 being located in the dry connection sleeve 23. The wet connecting sleeve 22, the dry connecting sleeve 23 and the intermediate connecting sleeve 24 are detachably connected, the motor 3, the wet connecting sleeve 22 and the valve body 6 are fixedly connected through socket head cap screws 25, and the dry connecting sleeve 23 and the intermediate connecting sleeve 24 are clamped and fixed between the motor 3 and the wet connecting sleeve 22.
The rotary reset magnetic steel is arranged on the cylinder wall inside the dry connecting sleeve 23, is sleeved on the rotor 10 and comprises a first reset magnetic steel 26 fixed on the extending end of the rotor 10 and a second reset magnetic steel 27 fixed on the cylinder wall inside the dry connecting sleeve 23. In this embodiment, the first reset magnetic steel 26 and the second reset magnetic steel 27 have smaller space and different polarities, and have the function of mutual attraction.
The dry connecting sleeve 23 is a cylinder, the dry connecting sleeve 23 is rotatably connected with the middle connecting sleeve 24, a zeroing hole 28 is formed in the outer cylinder wall surface of the side face of the dry connecting sleeve 23, and an operator can operate the dry connecting sleeve 23 to rotate only by disassembling the fixed inner hexagon screw 25.
When the valve body 1, the mechanical transmission mechanism 2 and the motor 3 are assembled and then the valve core 4 is in zero position offset, or the valve core 4 rotates to deviate from the initial zero position in the working process of the valve body 1, manual zero setting is needed. That is, the operator holds the zeroing tool and the zeroing hole 28, the zeroing hole 28 controls the dry connecting sleeve 23 to rotate relative to the middle connecting sleeve 24 and the motor 3, the dry connecting sleeve 23 rotates to drive the second reset magnetic steel 27 to rotate, and the first reset magnetic steel 26 and the second reset magnetic steel 27 attract each other, the second reset magnetic steel 27 rotates and simultaneously drives the rotor 10 of the motor 3 to rotate, the mechanical transmission mechanism 2 transmits the torque output by the rotor 10 to the valve core 4, and finally the valve core 4 is guaranteed to return to an initial zero position, so that manual zeroing is realized.
The two ends of the secondary moment amplifying mechanism 13 are correspondingly sleeved with sealing positioning structures 29, the secondary moment amplifying mechanism 13 is rotatably connected with the sealing positioning structures 29, an open slot 30 is formed in the wet connecting sleeve 22 in a penetrating mode, the sealing positioning structures 29 are embedded in the wet connecting sleeve 22 through the open slot 30, and one end of the secondary moment amplifying mechanism 13 extends into the dry operating cavity 9 through the open slot 30 to be connected with the primary moment amplifying mechanism 12.
The secondary moment amplifying mechanism 13, the valve body 6 and the sealing positioning structure 29 far away from the primary moment amplifying mechanism 12 form a balance cavity 31, the balance cavity 31 and the pressure of the dry-type operating cavity 9 on the secondary moment amplifying mechanism 13 are balanced, and the axial side force of the primary moment amplifying mechanism 12 can be prevented from acting on the crankshaft 18 to enable the crankshaft to axially displace and deform.
The sealing positioning structure 29 comprises a sealing ring 34 and a bearing 33, the sealing ring 34 and the bearing 33 are sleeved on the connecting rod 37 side by side, the bearing 33 on the sealing positioning structure 29 is arranged close to the valve core middle shifting fork 19 relative to the sealing ring 34, and the sealing ring 34 only bears rotary abrasion generated by swinging of the crankshaft 18. The bearing 33 can support the crankshaft 18, reduce its coefficient of friction during motion, and ensure its accuracy of rotation, and acts to fix and reduce the coefficient of friction of the load during mechanical transmission. The sealing ring 34 can prevent hydraulic oil in the wet-type operation cavity 8 from leaking, and simultaneously forms a balance cavity 31 with the valve body 6 and the connecting rod 37, and the balance cavity is balanced with the pressure of the dry-type operation cavity 9, so that the structure is ingenious.
The valve core 4 is fixedly connected with the secondary moment amplifying mechanism 13 through a valve core transmission rod 32, and the valve core transmission rod 32 extends into the valve core 4 and is fixedly connected with the valve core 4. The valve core 4 is internally provided with a valve core low-pressure flow passage 41, the valve core transmission rod 32 is internally provided with a through valve core transmission rod flow passage 42, and the valve core low-pressure flow passage 41 is communicated with the wet-type operation cavity 8 through the valve core transmission rod flow passage 42.
In this embodiment, as shown in fig. 6, the valve sleeve 5 is axially provided with a P port, an a port, a T port, a B port, and a P port in sequence, where the P port is an oil inlet, the T port is an oil outlet, and the valve sleeve 5 is provided with a sensitive cavity channel 38. The valve core 4 is provided with a high-pressure kidney-shaped groove 35 and a low-pressure kidney-shaped groove 36, a variable throttling port is formed between the sensitive cavity channel 38 and the high-pressure kidney-shaped groove 35 and the low-pressure kidney-shaped groove 36 respectively, the high-pressure kidney-shaped groove 35 and the low-pressure kidney-shaped groove 36 are communicated with a sensitive cavity 39 in the valve body 1 through the sensitive cavity channel 38, and the two variable throttling ports are connected in series to form a resistance half bridge so as to control the pressure of the sensitive cavity 39.
As shown in fig. 3, when the motor 3 has no control signal, the valve core 4 is at zero position, the joint areas of the high-pressure kidney-shaped groove 35 and the low-pressure kidney-shaped groove 36 and the sensitive cavity channel 38 are the same, the pressure at the left end of the valve core 4 is half of the system pressure P, and the pressure at the right end is constant P, at this time, the effective area of the high-pressure cavity 40 in the valve main body 1 is only half of the area of the sensitive cavity 39, so that the pressures of the high-pressure cavity 40 and the sensitive cavity 39 are equal, and the valve core 4 is in a balanced state.
As can be seen from fig. 2-4:
1. the motor 3 receives the control signal, the rotor 10 of the motor 3 rotates clockwise (seen from right to left) to drive the motor ball head 14 to swing rightwards (seen from right to left), the crankshaft shifting fork 15 rotates clockwise by a corresponding angle under the extrusion of the motor ball head 14, and primary moment amplification is realized; the crankshaft shifting fork 15 rotates to drive the crankshaft 18 to swing leftwards (seen from right to left), the valve core middle shifting fork 19 rotates clockwise (seen from right to left) by a corresponding angle under the extrusion of the crankshaft 18, the secondary moment amplification is realized, and the valve core middle shifting fork 19 rotates clockwise to finally drive the valve core 4 to rotate clockwise (seen from right to left) through the valve core transmission rod 32. After the valve core 4 rotates, the joint area of the high-pressure kidney-shaped groove 35, the low-pressure kidney-shaped groove 36 and the sensitive cavity channel 38 changes, so that the pressure in the sensitive cavity 39 changes, and the valve core 4 moves axially.
When the valve core 4 rotates clockwise (seen from right to left) along with the valve core shifting fork 7, the cross-connecting area of the high-pressure kidney-shaped groove 35 and the sensitive cavity channel 38 on the valve core 4 is reduced, the cross-connecting area of the low-pressure kidney-shaped groove 36 and the sensitive cavity channel 38 is increased, the pressure of the sensitive cavity 39 on the left side of the valve core 4 is reduced, and the pressure of the high-pressure cavity 40 on the right side of the valve core 4 is constant, so that the valve core 4 moves leftwards and axially under the action of unbalanced hydraulic pressure of the left cavity and the right cavity.
2. Similarly, when the motor 3 receives a control signal, the rotor 10 of the motor 3 rotates anticlockwise (seen from right to left) to drive the motor ball head 14 to swing leftwards (seen from right to left), and the crankshaft shifting fork 15 rotates anticlockwise by a corresponding angle under the extrusion of the motor ball head 14, so that primary moment amplification is realized; the crankshaft shifting fork 15 rotates to drive the crankshaft 18 to swing rightwards (seen from right to left), the valve core middle shifting fork 19 rotates anticlockwise (seen from right to left) by a corresponding angle under the extrusion of the crankshaft 18, the secondary moment amplification is realized, and the valve core middle shifting fork 19 rotates anticlockwise to finally drive the valve core 4 to rotate anticlockwise (seen from right to left) through the valve core transmission rod 32. After the valve core 4 rotates, the joint area of the high-pressure kidney-shaped groove 35, the low-pressure kidney-shaped groove 36 and the sensitive cavity channel 38 changes, so that the pressure in the sensitive cavity 39 changes, and the valve core 4 moves axially.
When the valve core 4 rotates anticlockwise (seen from right to left) along with the valve core shifting fork 7, the cross-connecting area of the high-pressure kidney-shaped groove 35 and the sensitive cavity channel 38 on the step of the valve core 4 is increased, the cross-connecting area of the low-pressure kidney-shaped groove 36 and the sensitive cavity channel 38 is reduced, the pressure of the sensitive cavity 39 on the left side of the valve core 4 is increased, and the pressure of the high-pressure cavity 40 on the right side of the valve core 4 is constant, so that the valve core 4 moves rightwards and axially under the action of unbalanced hydraulic pressure of the left cavity and the right cavity.
Based on the description of the invention and the accompanying drawings, a two-dimensional electro-hydraulic servo valve based on a dry-wet separation transmission mechanism of the invention can be easily manufactured or used by a person skilled in the art, and the positive effects described in the invention can be produced.
The foregoing description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and any simple modification, equivalent variation, etc. of the above embodiment according to the technical matter of the present invention fall within the scope of the present invention.
Claims (9)
1. A two-dimensional electrohydraulic servo valve based on a dry-wet separation transmission mechanism comprises a valve main body, wherein the valve main body is connected with a motor through a mechanical transmission mechanism; the valve body comprises a valve core, a valve sleeve and a valve body, the valve sleeve is coaxially sleeved outside the valve core, the valve core and the valve sleeve can slide and rotate relatively, and the valve body is coaxially sleeved outside the valve sleeve; the method is characterized in that:
the mechanical transmission mechanism comprises a shell arranged between the valve main body and the motor, a wet-type operation cavity and a dry-type operation cavity are arranged in the shell, and the wet-type operation cavity is communicated with an oil way in the valve main body; the dry-type operation cavity is arranged at one side of the wet-type operation cavity, and a rotor of the motor stretches into the dry-type operation cavity;
the mechanical transmission mechanism further comprises a transmission assembly, the transmission assembly comprises a primary moment amplifying mechanism and a secondary moment amplifying mechanism which are connected, the primary moment amplifying mechanism is arranged in the dry-type operation cavity and connected with the rotor, and the secondary moment amplifying mechanism is arranged in the wet-type operation cavity and connected with the valve core.
2. The two-dimensional electro-hydraulic servo valve based on a dry-wet separation transmission mechanism according to claim 1, wherein the two-dimensional electro-hydraulic servo valve is characterized in that: the primary torque amplifying mechanism comprises a motor ball and a crankshaft shifting fork, the motor ball is arranged in a shifting fork groove of the crankshaft shifting fork, the motor ball is connected with the rotor through a ball connecting piece, and the crankshaft shifting fork is connected with the secondary torque amplifying mechanism.
3. The two-dimensional electro-hydraulic servo valve based on a dry-wet separation transmission mechanism according to claim 1, wherein the two-dimensional electro-hydraulic servo valve is characterized in that: the secondary moment amplifying mechanism comprises a crankshaft and a valve core middle shifting fork, a shaft neck of the crankshaft is arranged in a shifting fork groove of the valve core middle shifting fork, one end of the crankshaft stretches into the dry-type operation cavity to be connected with the primary moment amplifying mechanism, and the valve core middle shifting fork is connected with the valve core.
4. The two-dimensional electro-hydraulic servo valve based on a dry-wet separation transmission mechanism according to claim 1, wherein the two-dimensional electro-hydraulic servo valve is characterized in that: the shell comprises a wet connecting sleeve, a dry connecting sleeve and an intermediate connecting sleeve, wherein the intermediate connecting sleeve is arranged between the wet connecting sleeve and the dry connecting sleeve, the wet operating cavity is arranged in the wet connecting sleeve, and the dry operating cavity is arranged in the dry connecting sleeve.
5. The two-dimensional electro-hydraulic servo valve based on the dry-wet separation transmission mechanism according to claim 4, wherein the two-dimensional electro-hydraulic servo valve is characterized in that: the rotary reset magnetic steel is sleeved on the rotor and comprises a first reset magnetic steel fixed on the extending end of the rotor and a second reset magnetic steel fixed on the inner cylinder wall of the dry connecting sleeve.
6. The two-dimensional electro-hydraulic servo valve based on the dry-wet separation transmission mechanism according to claim 4, wherein the two-dimensional electro-hydraulic servo valve is characterized in that: the dry connecting sleeve is arranged as a cylinder and is rotatably connected with the middle connecting sleeve, and zero-setting holes are formed in the wall surface of the outer cylinder on the side surface of the dry connecting sleeve.
7. The two-dimensional electro-hydraulic servo valve based on the dry-wet separation transmission mechanism according to claim 4, wherein the two-dimensional electro-hydraulic servo valve is characterized in that: the two ends of the secondary torque amplifying mechanism are correspondingly sleeved with sealing positioning structures, the secondary torque amplifying mechanism is rotatably connected with the sealing positioning structures, an opening groove is formed in the wet connecting sleeve in a penetrating mode, the sealing positioning structures are embedded in the wet connecting sleeve through the opening groove, and one end of the secondary torque amplifying mechanism extends into the dry operating cavity through the opening groove to be connected with the primary torque amplifying mechanism.
8. The two-dimensional electro-hydraulic servo valve based on the dry-wet separation transmission mechanism according to claim 7, wherein the two-dimensional electro-hydraulic servo valve is characterized in that: the secondary moment amplifying mechanism, the valve body and the sealing positioning structure far away from the primary moment amplifying mechanism form a balance cavity, and the balance cavity and the dry-type operation cavity balance the pressure of the secondary moment amplifying mechanism.
9. The two-dimensional electro-hydraulic servo valve based on a dry-wet separation transmission mechanism according to claim 1, wherein the two-dimensional electro-hydraulic servo valve is characterized in that: the valve core is fixedly connected with the secondary moment amplifying mechanism through a valve core transmission rod, and the valve core transmission rod extends into the valve core and is fixedly connected with the valve core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311534554.5A CN117366285A (en) | 2023-11-16 | 2023-11-16 | Two-dimensional electrohydraulic servo valve based on dry-wet separation transmission mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311534554.5A CN117366285A (en) | 2023-11-16 | 2023-11-16 | Two-dimensional electrohydraulic servo valve based on dry-wet separation transmission mechanism |
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| Publication Number | Publication Date |
|---|---|
| CN117366285A true CN117366285A (en) | 2024-01-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311534554.5A Pending CN117366285A (en) | 2023-11-16 | 2023-11-16 | Two-dimensional electrohydraulic servo valve based on dry-wet separation transmission mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117366285A (en) |
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2023
- 2023-11-16 CN CN202311534554.5A patent/CN117366285A/en active Pending
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