CN108612697B - Sheet valve core rotary direct-drive electrohydraulic servo valve - Google Patents
Sheet valve core rotary direct-drive electrohydraulic servo valve Download PDFInfo
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- CN108612697B CN108612697B CN201810577733.XA CN201810577733A CN108612697B CN 108612697 B CN108612697 B CN 108612697B CN 201810577733 A CN201810577733 A CN 201810577733A CN 108612697 B CN108612697 B CN 108612697B
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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
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Abstract
The invention provides a sheet valve core rotary direct-drive electrohydraulic servo valve, which adopts a sheet valve core structure, and has novel and simple structure, easy processing and convenient assembly; the flow and the rotation angle form a linear relation, the flow gain is constant, no acceleration zero drift exists, and the control is simple and flexible; particularly, the symmetrical arrangement structure of oil inlets at two sides of the valve core is adopted, so that the hydraulic force in the circumferential direction when the valve port is opened and closed is greatly reduced, and the dynamic characteristic of the servo valve in the form can be effectively improved. The novel direct-current brushless servo valve comprises a direct-current brushless servo valve motor, an upper end cover, an auxiliary oil distribution disc, a sheet valve core rotary disc, a main oil distribution disc and a lower end cover, wherein a valve core installation cavity is formed in the upper end of the main oil distribution disc in a concave mode, the sheet valve core rotary disc is positioned in the valve core installation cavity, the upper end faces of the sheet valve core rotary disc and the main oil distribution disc are flush, the lower end face of the auxiliary oil distribution disc is covered on the upper end faces corresponding to the main oil distribution disc and the sheet valve core rotary disc, and the upper end cover is arranged on the upper end face of the auxiliary oil distribution disc in a covering mode.
Description
Technical Field
The invention relates to the technical field of hydraulic valves, in particular to a sheet valve core rotary direct-drive electrohydraulic servo valve.
Background
The electrohydraulic servo valve is used as a key element of an electrohydraulic servo control system, is not only an electrohydraulic conversion element, but also a power amplifying element, connects an electric part with a hydraulic part to realize conversion and amplification of electrohydraulic signals, and the performance of the electrohydraulic servo valve determines the performance of the whole electrohydraulic control system to a great extent, and is widely applied to a plurality of fields such as machinery, automobiles, ships, aviation, aerospace and the like by the characteristics of high precision and quick response.
At present, along with the widening of the application field of the electrohydraulic servo system, the new application occasion also provides higher requirements for the electrohydraulic servo valve: the traditional electrohydraulic servo valve has the advantages of high frequency response, high reliability, strong pollution resistance, simple structure, convenient use and maintenance, low cost and the like, and the traditional electrohydraulic servo valve is difficult to meet the requirements, so that the development of a novel electrohydraulic servo valve has become a big subject and a technical barrier in the hydraulic industry. Along with the development of novel functional materials, novel microelectronic components are also operated, and particularly, electric drivers which can be used as electrohydraulic servo valves are also enriched successively, and the appearance of the electric drivers provides a technical basis for the development of the electrohydraulic servo valves. Therefore, efforts are being made at home and abroad to develop novel electrohydraulic servo valves, in particular rotary electrohydraulic servo valves, see references for details: wang Xiao, a rotary electrohydraulic servo valve and application research of the rotary electrohydraulic servo valve in a hydraulic system, hydro-pneumatic and sealing, 2014 (01): 40-47. The rotary electrohydraulic servo valve is listed and described in detail in the literature at home and abroad in recent years.
Among them, the servo rotary valve designed by Tadahiko Nogami was a typical rotary disk type servo valve in 1991. The oil port plate mainly comprises an oil port plate, a rotary plate and an oil distribution plate, wherein the rotary plate is a rotary piece, and valve ports a, b, c, d on the rotary plate respectively correspond to oil ports A, B, P, T on the oil port plate. The annular groove on the oil distribution disc is divided into two semicircular cavities G, H by two cylindrical blocks, which correspond to the valve ports a and b respectively, and the end surfaces of the two cylindrical blocks just cover the valve ports c and d. The turntable and the oil port disk are assembled as shown in the figure. At this time, the valve core is in the neutral position, and no oil flows. When the turntable rotates clockwise, the oil port P is communicated with the A, and the oil port B is communicated with the T; otherwise, the oil flows in opposite directions. In 1991, a single-stage rotary shaft type rotary electrohydraulic servo valve developed by Zhejiang university fluid transmission and control laboratory is provided with eight valve holes uniformly along the circumference, the valve holes connected with oil inlet and outlet are rectangular, and the valve holes connected with working ports A and B are round. Four grooves are uniformly formed in the valve core along the circumferential direction, and the rectangular opening in the valve sleeve is just covered by the interval between the two grooves. In order to compensate the imbalance of radial force of the rotating shaft caused by working pressure difference, the valve is provided with a compensating oil way on the valve sleeve. In addition, in order to balance the oil pressure of the load port of the rotary valve, a balance step is cut on the valve core. The structural design of the valve power stage is suitable for high-pressure and high-flow working occasions. In 2005, a servo rotary valve with the same structure as a rotary valve of Zhejiang university was also developed by Beijing aviation aerospace university.
The turntable valve has the advantages of simple structure, convenient processing and the like, but the radial force of the turntable is unbalanced and the flow control is nonlinear, so that the control difficulty of the system is improved; the rotary valve developed by Zhejiang University and Beihang University has the advantages of simple structure, balanced radial force, short valve core, small inertia force, good stability and the like, but the valve core and the valve sleeve are difficult to process and match, and the precision of the valve is reduced. In addition, the current servo valve does not effectively overcome the influence of hydrodynamic force.
Disclosure of Invention
Aiming at the problems, the invention provides the sheet valve core rotary direct-drive electrohydraulic servo valve which adopts a sheet valve core structure, and has novel and simple structure, easy processing and convenient assembly; the flow and the rotation angle form a linear relation, the flow gain is constant, no acceleration zero drift exists, and the control is simple and flexible; particularly, the symmetrical arrangement structure of oil inlets at two sides of the valve core is adopted, so that the hydraulic force in the circumferential direction when the valve port is opened and closed is greatly reduced, and the dynamic characteristic of the servo valve in the form can be effectively improved.
The utility model provides a rotatory direct drive electrohydraulic servo valve of slice case which characterized in that: the direct current brushless servo motor comprises a direct current brushless servo motor, an upper end cover, an auxiliary oil distribution disc, a sheet valve core rotating disc, a main oil distribution disc and a lower end cover, wherein a valve core installation cavity is formed in the upper end of the main oil distribution disc in a concave mode, the sheet valve core rotating disc is positioned in the valve core installation cavity, the upper end faces of the sheet valve core rotating disc and the main oil distribution disc are flush, the lower end face of the auxiliary oil distribution disc covers the upper end faces corresponding to the main oil distribution disc and the sheet valve core rotating disc, the upper end cover is covered on the upper end face of the auxiliary oil distribution disc, the radial outer side of the upper end cover is connected with the upper end cover, the auxiliary oil distribution disc and the main oil distribution disc through first axial bolts of annular cloth, the upper end face of the lower end cover is covered on the lower end face of the main oil distribution disc and is fixedly connected through second axial bolts of the annular cloth, and the center of the upper part of the upper end cover is provided with a center driving shaft hole of the sheet valve core rotating disc; an oil supply P port and an oil return T port are pre-arranged on the upper end cover, and a working A port and a working B port are pre-arranged on the lower end cover; the sheet valve core turntable is provided with two second P ports, two second T ports, two sections of arc-shaped second A ports and two sections of arc-shaped second B ports, the second P ports and the second T ports form a crossed 90-degree symmetrical arrangement structure, the structures formed by the second P ports and the second T ports form a crossed 45-degree symmetrical arrangement structure with the centers of the second A ports and the second B ports, and the second P ports and the second T ports, the second A ports and the second B ports are not arranged on the same circumference; the auxiliary oil distribution disc and the main oil distribution disc are provided with corresponding oil ports and annular grooves; when the servo valve is in a zero position, the oil supply port P, the oil return port T, the working port A and the working port B are isolated from each other; when the input current drives the direct current brushless servo motor to rotate and drives the sheet valve core turntable to rotate for a certain angle, the oil supply P port is communicated with the working A port, the working B port is communicated with the oil return T port or the oil supply P port is communicated with the working B port, and the working A port is communicated with the oil return T port.
It is further characterized by:
The arc length of each second port A is the same, the arc length of each second port B is the same, and the arc lengths of the second port A and the second port B are the same;
the two second P ports and the two second T ports are arranged on the inner circumference, the two arc-shaped second A ports and the two arc-shaped second B ports are arranged on the outer circumference, the two second P ports and the two second T ports are crossed and symmetrically arranged at 90 degrees, the second A ports and the second B ports are sequentially arranged at intervals and are respectively positioned in the outer expansion areas of the adjacent second P ports and second T ports, and the radial center of the arc length of each second A port or second B port and the radial center line of the adjacent second P port or second T port are arranged at an angle of 45 degrees;
an angular displacement sensor is integrated inside the direct current brushless servo motor;
The center of the sheet valve core turntable is provided with a guide shaft sleeve, the center of the guide shaft sleeve is provided with a center driving shaft hole, the axial direction of the upper end of the guide shaft sleeve penetrates through center through holes corresponding to the auxiliary oil distribution disc and the upper end cover, the length direction of the lower end of the guide shaft sleeve penetrates through center through holes corresponding to the main oil distribution disc, and the output shaft of the direct current brushless servo motor is inserted into the center driving shaft hole;
An internal thread is arranged in the central driving shaft hole, and an external thread of an output shaft of the direct current brushless servo motor is connected with the internal thread of the central driving shaft hole, so that stable and reliable connection is ensured;
An oil supply inner concave ring groove is formed in the upper end face of the auxiliary oil distribution disc, which corresponds to the right lower part of the oil supply P port, an oil return inner concave ring groove is formed in the upper end face of the auxiliary oil distribution disc, which corresponds to the right lower part of the oil return T port, the oil supply inner concave ring groove and the oil return inner concave ring groove are not communicated with each other, and the oil supply inner concave ring groove is provided with two oil ports forming an included angle of 90 degrees with the oil supply P port and communicated with the two first P ports; the oil return concave ring groove is provided with two oil ports forming an included angle of 90 degrees with the oil return T ports and communicated with the two first T ports; the connecting line of the two first P ports is perpendicular to the connecting line of the two first T ports, and the first P ports and the first T ports are respectively arranged on the lower end surface of the auxiliary oil distribution disc and form oil ports which are circumferentially and uniformly distributed corresponding to the circle center of the auxiliary oil distribution disc;
The oil supply inner concave ring groove is arranged on the radial inner side of the oil return inner concave ring groove;
The radial inner side and the radial outer side of the upper end face of the corresponding auxiliary oil distribution disc of the oil supply concave ring groove and the oil return concave ring groove are respectively provided with a sealing groove, O-shaped rings with corresponding sizes are arranged in the sealing grooves, and the O-shaped rings ensure that the respective oil in the oil supply concave ring groove and the oil return concave ring groove cannot leak;
The radial length of the first P port and the first T port covers a radial area formed by integrating the oil supply concave ring groove and the oil return concave ring groove;
The lower end face of the main oil distribution disc is provided with a first upward concave working concave annular groove corresponding to the working A port, the lower end face of the main oil distribution disc is provided with a second upward concave working concave annular groove corresponding to the working B port, the first and second working concave annular grooves are not communicated with each other, the first working concave annular groove is positioned on the radial inner side of the second working concave annular groove, and the first working concave annular groove is provided with two oil ports forming an included angle of 90 degrees with the working A port and communicated with the two first A ports; the second working inner concave ring groove is provided with two oil ports forming an included angle of 90 degrees with the working port B and communicated with the two first port B; the connecting lines of the two first ports A are perpendicular to the connecting lines of the two first ports B, the first ports A and the first ports B are respectively arranged on the upper end face of the main oil distribution disc, the radial length direction end of the first port A extends to the circumferential position corresponding to the radial area corresponding to the first port B, the upper end face of the main oil distribution disc is correspondingly provided with two concave P grooves and two concave T grooves, the two concave P grooves and the two concave T grooves are uniformly distributed on the same circumference of the center of the upper end face of the main oil distribution disc, the radial center line of each concave P groove or concave T groove and the radial center line of the adjacent first port A or first port B form a 45-degree angle, and the radial outer ends of the concave P grooves and the concave T grooves are correspondingly arranged on the circumferential position corresponding to the first port B;
The radial areas of the second port A and the second port B are arranged corresponding to the circumferential positions corresponding to the radial areas corresponding to the first port B;
The radial inner side and the radial outer side of the lower end face of the main oil distribution disc corresponding to the first working inner concave ring groove and the second working inner concave ring groove are respectively provided with a sealing groove, O-shaped rings with corresponding sizes are arranged in the sealing grooves, and the O-shaped rings ensure that the oil in each of the first working inner concave ring groove and the second working inner concave ring groove cannot leak;
When the servo valve is in a zero position, the first P port is communicated with the concave P groove at the corresponding position through the second P port at the corresponding position, the first T port is communicated with the concave T groove at the corresponding position through the second T port at the corresponding position, the first A port is communicated with the second A port at the corresponding position, and the first B port is communicated with the second B port at the corresponding position; each first P port corresponds to the area between the second A ports and the second B ports on two sides, and the concave P groove corresponds to the angular position of the unconnected circumferential area between the second A ports and the second B ports on two sides; the first T-shaped opening is arranged corresponding to the angular position of the unconnected circumferential area between the second A-shaped opening and the second B-shaped opening on two sides, and the concave T-shaped groove is arranged corresponding to the angular position of the unconnected circumferential area between the second A-shaped opening and the second B-shaped opening on two sides;
The contact area of the upper peripheral ring surface of the main oil distribution disc and the sheet valve core turntable is provided with a concave sealing groove, and a corresponding O-shaped ring is arranged in the sealing groove.
After the invention is adopted, the second P port and the second T port of the sheet valve core turntable are symmetrically arranged in a 90-degree crossing way and are also symmetrically arranged in a 45-degree crossing way with the second A port and the second B port, and the circumference of the second P port and the second T port and the circumference of the second A port and the second B port are circumferences without intersection areas, so that the P, T ports of the main valve core can be respectively communicated with the P, T ports on the auxiliary valve core through the P, T ports of the sheet valve core; when the disc-shaped valve core turntable rotates, the port P is communicated with the port A, high-pressure oil enters the port A from two directions of the main valve plate at the same time, and the thickness of the disc-shaped valve core turntable can be made thinner, so that the circumferential force generated by high-speed flow of the hydraulic oil is greatly reduced, the dynamic characteristics of the direct-acting type servo valve are improved, the structure of the direct-acting type electro-hydraulic servo valve is more compact, the oil supply port P and the oil return port T are particularly arranged on an upper end cover, and meanwhile, the working port A and the working port B are arranged on a lower end cover; the valve adopts a flaky valve core structure, and has novel and simple structure, easy processing and convenient assembly; the flow and the rotation angle form a linear relation, the flow gain is constant, no acceleration zero drift exists, and the control is simple and flexible; particularly, the symmetrical arrangement structure of oil inlets at two sides of the valve core is adopted, so that the hydraulic force in the circumferential direction when the valve port is opened and closed is greatly reduced, and the dynamic characteristic of the servo valve in the form can be effectively improved.
Drawings
FIG. 1 is a schematic cross-sectional view of the front view of the present invention;
FIG. 2 is a schematic diagram showing a perspective view of a sub-oil distribution pan according to the present invention;
FIG. 3 is a schematic diagram showing a perspective view of a sub-oil distribution plate according to the present invention;
FIG. 4 is a schematic perspective view of a disk of a spool in sheet form according to the present invention;
FIG. 5 is a schematic perspective view of a main oil distribution pan of the present invention;
FIG. 6 is a schematic diagram of a perspective view of a main oil distribution pan of the present invention;
FIG. 7 is a schematic diagram of an assembled explosion diagram of the auxiliary oil distribution disc, the sheet valve core turntable and the main oil distribution disc;
FIG. 8 is a schematic diagram of an assembled explosion diagram of the auxiliary oil distribution disc, the sheet valve core turntable and the main oil distribution disc;
In the drawing, a brushless servo valve motor 1, an upper end cover 2, a secondary oil distribution disc 3, a sheet valve core turntable 4, a main oil distribution disc 5, a lower end cover 6, a valve core installation cavity 7, a first axial bolt 8, a second axial bolt 9, a central driving shaft hole 10, an oil supply P port 11, an oil return T port 12, a work A port 13, a work B port 14, a second P port 15, a second T port 16, a second A port 17, a second B port 18, a guide shaft sleeve 19, an oil supply concave ring groove 20, an oil return concave ring groove 21, a first P port 22, a first T port 23, a first sealing groove 24, a first O-shaped ring 25, a first work concave ring groove 26, a second work concave ring groove 27, a first A port 28, a first B port 29, a concave P groove 30, a concave T groove 31, a second sealing groove 32, a second O-shaped ring 33, a third sealing groove 34 and a third O-shaped ring 35 are arranged.
Detailed Description
The sheet valve core rotates to directly drive the electrohydraulic servo valve, see figures 1-8: the direct current brushless servo motor comprises a direct current brushless servo motor 1, an upper end cover 2, an auxiliary oil distribution disc 3, a sheet valve core rotary disc 4, a main oil distribution disc 5 and a lower end cover 6, wherein a valve core mounting cavity 7 is formed in the upper end of the main oil distribution disc 5 in a concave manner, the sheet valve core rotary disc 4 is positioned in the valve core mounting cavity 7, the upper end faces of the sheet valve core rotary disc 4 and the main oil distribution disc 5 are flush, the lower end face of the auxiliary oil distribution disc 3 covers the upper end faces corresponding to the main oil distribution disc 4 and the sheet valve core rotary disc 5, the upper end face of the auxiliary oil distribution disc 3 is covered with the upper end cover 2, the radial outer side of the upper end cover 2 is connected with the upper end cover 2, the auxiliary oil distribution disc 3 and the main oil distribution disc 5 through first axial bolts 8 of annular cloth, the upper end face of the lower end cover 6 is covered with the lower end face of the main oil distribution disc 5 and is fixedly connected through second axial bolts 9 of the annular cloth, and the central driving shaft hole 10 of the sheet valve core rotary disc 4 is connected with an output shaft of the direct current brushless servo motor 1; an oil supply P port 11 and an oil return T port 12 are preset on the upper end cover 2, and a working A port 13 and a working B port 14 are preset on the lower end cover 6; the sheet valve core turntable 4 is provided with two second P ports 15, two second T ports 16, two sections of arc-shaped second A ports 17 and two sections of arc-shaped second B ports 18, the second P ports 15 and the second T ports 16 form a crossed 90-degree symmetrical arrangement structure, the structures formed by the second P ports 15 and the second T ports 16 and the centers of the second A ports 17 and the second B ports 18 form a crossed 45-degree symmetrical arrangement structure, and the second P ports 15, the second T ports 16, the second A ports 17 and the second B ports 18 are not arranged on the same circumference, and the auxiliary oil distribution disc 3 and the main oil distribution disc 5 are provided with corresponding oil ports and ring grooves; when the servo valve is in a zero position, the oil supply P port 11, the oil return T port 12, the working A port 13 and the working B port 14 are isolated from each other; when the input current drives the direct current brushless servo motor 1 to rotate and drives the sheet valve core turntable 4 to rotate for a certain angle, the oil supply P port 11 is communicated with the work A port 13, the work B port 14 is communicated with the oil return T port 12, or the oil supply P port 11 is communicated with the work B port 14, and the work A port 13 is communicated with the oil return T port 12.
The arc length of each second port A17 is the same, the arc length of each second port B18 is the same, and the arc lengths of the second port A17 and the second port B18 are the same;
an angular displacement sensor is integrated inside the direct current brushless servo motor 1;
The two second ports 15, the two second ports 16 are arranged on the inner circumference, the two arc-shaped second ports 17 and the two arc-shaped second ports 18 are arranged on the outer circumference, the two second ports 15 and the two second ports 16 are symmetrically arranged at 90 degrees in a crossing way, the second ports 17 and the second ports 18 are sequentially arranged at intervals and are respectively positioned in the outer expansion areas of the adjacent second ports 15 and second ports 16, and the radial center of the arc length of each second port 17 or second port 18 and the radial center line of the adjacent second port 15 or second port 16 are arranged at an angle of 45 degrees;
The center of the sheet valve core turntable 4 is provided with a guide shaft sleeve 19, the center of the guide shaft sleeve 19 is provided with a central driving shaft hole 10, the length direction of the upper end of the guide shaft sleeve 19 penetrates through the central through holes corresponding to the auxiliary oil distribution disc 3 and the upper end cover 2, the length direction of the lower end of the guide shaft sleeve 19 penetrates through the central through hole corresponding to the main oil distribution disc 5, and the output shaft of the direct current brushless servo motor 1 is inserted into the central driving shaft hole 10;
The internal thread is arranged in the central driving shaft hole 10, and the output shaft of the direct current brushless servo motor 1 is connected with the internal thread of the central driving shaft hole through threads, so that stable and reliable connection is ensured;
An oil supply inner concave ring groove 20 is arranged right below the upper end surface of the auxiliary oil distribution disc 3 corresponding to the oil supply P port 11, an oil return inner concave ring groove 21 is arranged right below the upper end surface of the auxiliary oil distribution disc 3 corresponding to the oil return T port 12, the oil supply inner concave ring groove 20 and the oil return inner concave ring groove 21 are not communicated with each other, and the oil supply inner concave ring groove 20 is provided with two oil ports forming an included angle of 90 degrees with the oil supply P port 11 and communicated with the two first P ports 22; the oil return concave ring groove 21 is provided with two oil ports forming an included angle of 90 degrees with the oil return T-shaped port 12 and communicated with the two first T-shaped ports 23; the connecting line of the two first P ports 22 is perpendicular to the connecting line of the two first T ports 23, and the first P ports 22 and the first T ports 23 are respectively arranged on the lower end surface of the auxiliary oil distribution disc 3 and form oil ports which are uniformly distributed in the circumferential direction corresponding to the circle center of the auxiliary oil distribution disc 3;
in the specific embodiment, the oil supply inner concave ring groove 20 is disposed radially inside the oil return inner concave ring groove 21 (the oil supply inner concave ring groove may be disposed radially outside the oil return inner concave ring groove during actual manufacturing);
The radial inner side and the radial outer side of the upper end face of the corresponding auxiliary oil distribution disc 3 of the oil supply concave ring groove 20 and the oil return concave ring groove 21 are respectively provided with a first sealing groove 24, the first sealing groove 24 is internally provided with a first O-shaped ring 25 with a corresponding size, and the first O-shaped ring 25 ensures that the respective oil in the oil supply concave ring groove 20 and the oil return concave ring groove 21 cannot leak;
The radial length of the first P port 22 and the first T port 23 covers the radial area formed by integrating the oil supply concave annular groove 20 and the oil return concave annular groove 21;
The lower end face of the main oil distribution disc 5 is provided with a first concave working concave annular groove 26 corresponding to the working A port 13, the lower end face of the main oil distribution disc 5 is provided with a second concave working concave annular groove 27 corresponding to the working B port 14, the first concave working annular groove 26 and the second concave working annular groove 27 are not communicated with each other, the first concave working annular groove 26 is arranged on the radial inner side of the second concave working annular groove 27, and the first concave working annular groove 26 is provided with two oil ports forming an included angle of 90 degrees with the working A port 13 and communicated with the two first A ports 28; the second working female ring groove 27 is provided with two oil ports forming an included angle of 90 degrees with the working B port 14 and communicated with the two first B ports 29; the connection line of the two first ports 28 is perpendicular to the connection line of the two first ports 29, the first ports 28 and 29 are respectively arranged on the upper end surface of the main oil distribution disc 5, the radial length direction end of the first port 28 extends to the circumferential position corresponding to the radial region corresponding to the first port 29, the upper end surface of the main oil distribution disc 5 is correspondingly provided with two concave P grooves 30 and two concave T grooves 31, the two concave P grooves 30 and the two concave T grooves 31 are uniformly distributed corresponding to the same circumference with respect to the center of the upper end surface of the main oil distribution disc 5, the radial center line of each concave P groove 30 or concave T groove 31 and the radial center line of the adjacent first port 28 or first port 29 are arranged at an angle of 45 degrees, and the radial outer ends of the concave P grooves 30 and the concave T grooves 31 are arranged corresponding to the circumferential position region corresponding to the first port 29;
the radial areas of the second port A17 and the second port B18 are arranged corresponding to the circumferential positions corresponding to the radial areas corresponding to the first port B29;
The radial inner side and the radial outer side of the lower end face of the corresponding main oil distribution disc of the first working inner concave ring groove 30 and the second working inner concave ring groove 31 are respectively provided with a second sealing groove 32, the second sealing groove 32 is internally provided with a second O-shaped ring 33 with a corresponding size, and the second O-shaped ring 33 ensures that the respective oil in the first working inner concave ring groove 30 and the second working inner concave ring groove 31 cannot leak;
when the servo valve is in a zero position, the first P port 22 is communicated with the concave P groove 30 at the corresponding position through the second P port 15 at the corresponding position, the first T port 23 is communicated with the concave T groove 31 at the corresponding position through the second T port 16 at the corresponding position, the first A port 28 is communicated with the second A port 17 at the corresponding position, and the first B port 29 is communicated with the second B port 18 at the corresponding position; each of the first ports 22 is arranged corresponding to a region between the second ports 17 and 18 on both sides, and the concave P-shaped grooves 30 are arranged corresponding to angular positions of non-connected circumferential regions between the second ports 17 and 18 on both sides; the first T-shaped ports 23 are arranged corresponding to the angular positions of the unconnected circumferential areas between the second A-shaped ports 17 and the second B-shaped ports 18 on two sides, and the concave T-shaped grooves 31 are arranged corresponding to the angular positions of the unconnected circumferential areas between the second A-shaped ports 17 and the second B-shaped ports 18 on two sides;
the contact area of the upper peripheral ring surface of the main oil distribution disc 5 and the sheet valve core turntable 4 is provided with a concave third sealing groove 34, and a corresponding third O-shaped ring 35 is arranged in the third sealing groove 34.
The working principle is as follows: the second P port and the second T port of the sheet valve core turntable are symmetrically arranged at an intersection of 90 degrees, and are also symmetrically arranged at an intersection of 45 degrees with the second A port and the second B port, and the circumferences of the second P port and the second T port and the circumferences of the second A port and the second B port are circumferences without intersection areas, so that the concave P groove and the concave T groove of the main valve core can be respectively communicated with the first P port and the first T port on the auxiliary valve core through the second P port and the second T port of the sheet valve core; when the disc-shaped valve core rotary table rotates, the arc-shaped second A port and the arc-shaped second B port respectively rotate, so that the first P port and the first T port on the auxiliary valve core rotary table are respectively communicated with the first A port and the second B port on the main valve core rotary table through the arc-shaped second A port and the arc-shaped second B port, the oil supply P port is connected with the first P port through the oil supply inner concave ring groove, the oil return T port is connected with the first T port through the oil return inner concave ring groove, the first A port is connected with the working A port through the first working inner concave ring groove, the second A port is connected with the working B port through the second working inner concave ring groove, the P, T port of the main valve core rotary table can be respectively communicated with the A, B port on the auxiliary valve core rotary table, and the high-pressure oil enters the first A port from two directions simultaneously, and the circular-amplitude dynamic valve core is provided with a more compact structure because the disc-shaped rotary valve core rotary table can be arranged on the upper end cover and the upper end cover; the valve adopts a flaky valve core structure, and has novel and simple structure, easy processing and convenient assembly; the flow and the rotation angle form a linear relation, the flow gain is constant, no acceleration zero drift exists, and the control is simple and flexible; particularly, the symmetrical arrangement structure of oil inlets at two sides of the valve core is adopted, so that the hydraulic force in the circumferential direction when the valve port is opened and closed is greatly reduced, and the dynamic characteristic of the servo valve in the form can be effectively improved.
The foregoing describes the embodiments of the present invention in detail, but the description is only a preferred embodiment of the invention and should not be construed as limiting the scope of the invention. All equivalent changes and modifications made in accordance with the scope of the present invention shall fall within the scope of the present patent.
Claims (10)
1. The utility model provides a rotatory direct drive electrohydraulic servo valve of slice case which characterized in that: the direct current brushless servo motor comprises a direct current brushless servo motor, an upper end cover, an auxiliary oil distribution disc, a sheet valve core rotating disc, a main oil distribution disc and a lower end cover, wherein a valve core installation cavity is formed in the upper end of the main oil distribution disc in a concave mode, the sheet valve core rotating disc is positioned in the valve core installation cavity, the upper end faces of the sheet valve core rotating disc and the main oil distribution disc are flush, the lower end face of the auxiliary oil distribution disc covers the upper end faces corresponding to the main oil distribution disc and the sheet valve core rotating disc, the upper end cover is covered on the upper end face of the auxiliary oil distribution disc, the radial outer side of the upper end cover is connected with the upper end cover, the auxiliary oil distribution disc and the main oil distribution disc through first axial bolts of annular cloth, the upper end face of the lower end cover is covered on the lower end face of the main oil distribution disc and is fixedly connected through second axial bolts of the annular cloth, and the center of the upper part of the upper end cover is provided with a center driving shaft hole of the sheet valve core rotating disc; an oil supply P port and an oil return T port are pre-arranged on the upper end cover, and a working A port and a working B port are pre-arranged on the lower end cover; the sheet valve core turntable is provided with two second P ports, two second T ports, two sections of arc-shaped second A ports and two sections of arc-shaped second B ports, the second P ports and the second T ports form a crossed 90-degree symmetrical arrangement structure, the structures formed by the second P ports and the second T ports form a crossed 45-degree symmetrical arrangement structure with the centers of the second A ports and the second B ports, and the second P ports and the second T ports, the second A ports and the second B ports are not arranged on the same circumference; the auxiliary oil distribution disc and the main oil distribution disc are provided with corresponding oil ports and annular grooves; when the servo valve is in a zero position, the oil supply P port, the oil return T port, the working A port and the working B port are mutually isolated.
2. The spool rotary direct-drive electro-hydraulic servo valve of claim 1, wherein: the arc length of each second port A is the same, the arc length of each second port B is the same, and the arc lengths of the second port A and the second port B are the same.
3. The spool rotary direct-drive electro-hydraulic servo valve of claim 1, wherein: the two second P ports and the two second T ports are arranged on the inner circumference, the two arc-shaped second A ports and the two arc-shaped second B ports are arranged on the outer circumference, the two second P ports and the two second T ports are crossed and symmetrically arranged at 90 degrees, the second A ports and the second B ports are sequentially arranged at intervals and are respectively positioned in the adjacent second P ports and the adjacent second T ports in an external expansion area, and the radial center of the arc length of each second A port or each second B port and the radial center line of the adjacent second P port or second T port are arranged at an angle of 45 degrees.
4. The spool rotary direct-drive electro-hydraulic servo valve of claim 1, wherein: the center of the flaky valve core turntable is provided with a guide shaft sleeve, the center of the guide shaft sleeve is provided with a center driving shaft hole, the axial direction of the upper end of the guide shaft sleeve penetrates through the center through holes corresponding to the auxiliary oil distribution disc and the upper end cover, the length direction of the lower end of the guide shaft sleeve penetrates through the center through holes corresponding to the main oil distribution disc, and the output shaft of the direct current brushless servo motor is inserted into the center driving shaft hole.
5. The spool rotary direct-drive electro-hydraulic servo valve of claim 4, wherein: the internal thread is arranged in the central driving shaft hole, and the external thread of the output shaft of the direct current brushless servo motor is connected with the internal thread of the central driving shaft hole.
6. The spool rotary direct-drive electro-hydraulic servo valve of claim 1, wherein: an oil supply inner concave ring groove is formed in the upper end face of the auxiliary oil distribution disc, which corresponds to the right lower part of the oil supply P port, an oil return inner concave ring groove is formed in the upper end face of the auxiliary oil distribution disc, which corresponds to the right lower part of the oil return T port, the oil supply inner concave ring groove and the oil return inner concave ring groove are not communicated with each other, and the oil supply inner concave ring groove is provided with two oil ports forming an included angle of 90 degrees with the oil supply P port and communicated with the two first P ports; the oil return inner concave ring groove is provided with two oil ports forming an included angle of 90 degrees with the oil return T ports and communicated with the two first T ports; the connecting lines of the two first P ports are perpendicular to the connecting lines of the two first T ports, and the first P ports and the first T ports are respectively arranged on the lower end face of the auxiliary oil distribution disc and form oil ports which are circumferentially and uniformly distributed corresponding to the circle center of the auxiliary oil distribution disc.
7. The spool rotary direct-drive electro-hydraulic servo valve of claim 6, wherein: the radial length of the first P port and the radial length of the first T port cover the radial area formed by integrating the oil supply inner concave ring groove and the oil return inner concave ring groove.
8. The spool rotary direct-drive electro-hydraulic servo valve of claim 7, wherein: the lower end face of the main oil distribution disc is provided with a first upward concave working concave annular groove corresponding to the working A port, the lower end face of the main oil distribution disc is provided with a second upward concave working concave annular groove corresponding to the working B port, the first and second working concave annular grooves are not communicated with each other, the first working concave annular groove is positioned on the radial inner side of the second working concave annular groove, and the first working concave annular groove is provided with two oil ports forming an included angle of 90 degrees with the working A port and communicated with the two first A ports; the second working inner concave ring groove is provided with two oil ports forming an included angle of 90 degrees with the working port B and communicated with the two first port B; the connecting lines of the two first ports A are perpendicular to the connecting lines of the two first ports B, the first ports A and B are respectively arranged on the upper end face of the main oil distribution disc, the radial length direction end of the first port A extends to the circumferential position corresponding to the radial area corresponding to the first port B, the upper end face of the main oil distribution disc is correspondingly provided with two concave P grooves and two concave T grooves, the two concave P grooves and the two concave T grooves are uniformly distributed on the same circumference of the center of the upper end face of the main oil distribution disc, the radial center line of each concave P groove or concave T groove and the radial center line of the adjacent first port A or B are arranged at an angle of 45 degrees, and the radial outer ends of the concave P grooves and the concave T grooves are correspondingly arranged at the circumferential position corresponding to the first port B.
9. The spool rotary direct-drive electro-hydraulic servo valve of claim 8, wherein: the radial areas of the second port A and the second port B are arranged corresponding to the circumferential positions corresponding to the radial areas corresponding to the first port B.
10. The spool rotary direct-drive electro-hydraulic servo valve of claim 9, wherein: when the servo valve is in a zero position, the first P port is communicated with the concave P groove at the corresponding position through the second P port at the corresponding position, the first T port is communicated with the concave T groove at the corresponding position through the second T port at the corresponding position, the first A port is communicated with the second A port at the corresponding position, and the first B port is communicated with the second B port at the corresponding position; each first P port corresponds to the area between the second A ports and the second B ports on two sides, and the concave P groove corresponds to the angular position of the unconnected circumferential area between the second A ports and the second B ports on two sides; the first T-shaped openings are arranged corresponding to the angular positions of the unconnected circumferential areas between the second A-shaped openings and the second B-shaped openings on two sides, and the concave T-shaped grooves are arranged corresponding to the angular positions of the unconnected circumferential areas between the second A-shaped openings and the second B-shaped openings on two sides.
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| CN201810577733.XA CN108612697B (en) | 2018-06-07 | 2018-06-07 | Sheet valve core rotary direct-drive electrohydraulic servo valve |
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| CN201810577733.XA CN108612697B (en) | 2018-06-07 | 2018-06-07 | Sheet valve core rotary direct-drive electrohydraulic servo valve |
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| CN109578361B (en) * | 2019-01-22 | 2024-04-12 | 江苏钧微动力科技有限公司 | Novel screw thread cartridge formula rotatory electric liquid servo valve that directly drives |
| CN110579252B (en) * | 2019-09-23 | 2020-06-26 | 中国科学院工程热物理研究所 | A high-reliability fuel metering device driven by a stepping motor |
| CN110541863B (en) * | 2019-10-11 | 2024-05-10 | 江苏钧微动力科技有限公司 | Direct-insertion rotary direct-drive electrohydraulic servo valve |
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| CN208311170U (en) * | 2018-06-07 | 2019-01-01 | 江苏钧微动力科技有限公司 | Piece-shape type Spool rotating directly drives electrohydraulic servo valve |
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| KR910008268B1 (en) * | 1989-04-24 | 1991-10-12 | 광림기계 주식회사 | Servo devices |
| CN100348872C (en) * | 2004-02-23 | 2007-11-14 | 北京航空航天大学 | Revolving electrohydraulic serve rotatable in limited angles |
| CN1324243C (en) * | 2004-04-14 | 2007-07-04 | 路冰宇 | Electro-hydraulic servo-valve |
| CN102434515B (en) * | 2011-11-17 | 2014-07-02 | 西安交通大学 | Hydraulic rotation valve with square-wave-shaped valve core |
| CN102720669B (en) * | 2012-06-29 | 2015-03-04 | 泸州天府液压件有限公司 | Follower rotary valve for plane oil distribution |
| CN105804931A (en) * | 2014-12-29 | 2016-07-27 | 哈尔滨润德伟业科技发展有限公司 | Electrohydraulic servo driving 360 degree rotary hydraulic motor |
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