CN109578361B - Novel screw thread cartridge formula rotatory electric liquid servo valve that directly drives - Google Patents
Novel screw thread cartridge formula rotatory electric liquid servo valve that directly drives Download PDFInfo
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- CN109578361B CN109578361B CN201910057335.XA CN201910057335A CN109578361B CN 109578361 B CN109578361 B CN 109578361B CN 201910057335 A CN201910057335 A CN 201910057335A CN 109578361 B CN109578361 B CN 109578361B
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- 239000007788 liquid Substances 0.000 title description 2
- 230000002093 peripheral effect Effects 0.000 claims abstract description 3
- 238000007789 sealing Methods 0.000 claims description 16
- 239000003292 glue Substances 0.000 claims description 6
- 238000005192 partition Methods 0.000 claims description 4
- 239000004744 fabric Substances 0.000 claims description 2
- 238000009434 installation Methods 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 230000010354 integration Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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Classifications
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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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- 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
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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
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/08—Guiding yokes for spindles; Means for closing housings; Dust caps, e.g. for tyre valves
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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
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/02—Actuating devices; Operating means; Releasing devices electric; magnetic
- F16K31/04—Actuating devices; Operating means; Releasing devices electric; magnetic using a motor
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Servomotors (AREA)
Abstract
The invention provides a novel threaded plug-in type rotary direct-drive electrohydraulic servo valve, which reduces end face leakage by adding a valve core end cover structure. The novel valve comprises a direct current brushless servo motor and a valve body assembly, wherein the valve body assembly comprises a valve core, a valve sleeve, an upper end cover and a lower end cover, an output shaft of the direct current brushless servo motor is connected with an upper convex part of a central shaft of the valve core, the direct current brushless servo motor is fixedly arranged at the upper end of the upper end cover, the valve core is arranged in an inner cavity of the valve sleeve, an external thread is arranged on the peripheral surface of an outer ring of the upper end cover and is used for being connected with an integrated valve block, the bottom of the valve core is arranged in a central positioning hole of the lower end cover.
Description
Technical Field
The invention relates to the technical field of electrohydraulic servo valves, in particular to a novel threaded plug-in type 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 servo control system to a great extent, and is widely applied to the fields of machinery, automobiles, ships, aviation, aerospace, robots 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 application occasion of the robot also brings higher requirements to the electrohydraulic servo valve: the traditional electrohydraulic servo valve has the advantages of high frequency response, high reliability, strong pollution resistance, simple structure, small volume, convenient use and maintenance, low cost, convenient integration and the like, the traditional electrohydraulic servo valve is difficult to reach the requirements, the current main stream of miniature electrohydraulic servo valve products in the market are Moog 30 series, E024 series and 242 which are all complicated to install, and the service life of the internal elastic element of the current electrohydraulic servo valve can not meet the application occasion of a robot.
Therefore, the autonomous development of an electrohydraulic servo valve with small volume, light weight, convenient integration and extremely reliable service life, particularly a screw-thread plug-in type rotary direct-drive electrohydraulic servo valve, is urgently needed in the field of robots. The direct current servo motor is required to have a small-angle frequent start-stop function in the application field of the threaded plug-in rotary direct drive electro-hydraulic servo valve, and the direct current servo motor also belongs to the application of the direct current servo motor in a frequent start-stop follow-up system. In the existing thread plug-in type rotary direct-drive electrohydraulic servo valve, the problem of large end face leakage exists.
Disclosure of Invention
Aiming at the problems, the invention provides a novel threaded plug-in type rotary direct-drive electrohydraulic servo valve, which reduces end face leakage by adding a valve core end cover structure.
A novel thread plug-in type rotary direct-drive electrohydraulic servo valve has the technical scheme that: the valve body assembly comprises a valve core, a valve sleeve, an upper end cover and a lower end cover, wherein an output shaft of the direct current brushless servo motor is connected with an upper convex part of a central shaft of the valve core, the direct current brushless servo motor is fixedly arranged at the upper end of the upper end cover, the valve core is arranged in an inner cavity of the valve sleeve, an external thread is arranged on the peripheral surface of an outer ring of the upper end cover, the external thread is used for being connected with an integrated valve block, the bottom of the valve core is arranged in a central positioning hole of the lower end cover, the valve body assembly is characterized in that a P port which is externally communicated with the inner cavity is arranged on the valve sleeve, different P ports are arranged at different circumferential positions of the same plane, two groups of throttling cavities which are concave are respectively an A cavity and a B cavity, the A cavity and the B cavity are arranged at different circumferential angular positions of the same plane of the inner wall circumference of the valve sleeve, a port and a port which are externally communicated are also arranged on the valve sleeve, a port and a port which is arranged on the lower end cover, and a port which is communicated with the valve core is arranged on the same plane, and a valve core is arranged on the valve sleeve, and the valve core is provided with the same height as the valve core, and the valve core is arranged on the valve sleeve in the same plane. When the servo valve is in a zero position, the port P, the port A, the port B and the port T are isolated from each other; when the valve is in a working state, the port P is communicated with the port A or the port B through a valve core switching oil way, the port T is communicated with the port B or the port A through a valve core switching oil way, and the port P and the port T are not communicated with the port A or the port B at the same time; the bottom outer ring of the central shaft of the valve core is sleeved with a valve core end cover, the valve core end cover is respectively provided with a lower convex positioning stop corresponding to the corresponding upper opening position of the valve core switching oil way, the corresponding lower convex positioning stop is respectively embedded into the upper opening of the valve core switching oil way and is sealed by glue, and the outer ring wall of the valve core is in clearance fit with the inner wall of the valve sleeve.
It is further characterized by:
the circumference of the outer annular wall of the valve core is upwards provided with two groups of oil way structures which are symmetrically arranged, each group of oil way structure comprises a P cavity, a T cavity, an A groove and a B groove, the corresponding positions of the outer annular wall of the valve core are respectively provided with a concave P cavity, a T cavity, an A groove and a B groove, the height direction of the P cavity covers the horizontal plane where the P cavity is positioned and the horizontal plane where the A cavity is positioned, the P cavity is connected with the P cavity and the A cavity, the height direction of the T cavity covers the horizontal plane where the B cavity is positioned, the bottom of the T cavity penetrates through the valve core and is communicated with the inlet of the T cavity, the T cavity is connected with the T cavity and the B cavity, the height direction of the A groove covers the horizontal plane where the A cavity is positioned and the horizontal plane where the A cavity is positioned, the A groove is used for connecting one group of throttling cavity and the A cavity under the working state, the height direction of the B groove covers the horizontal plane where the B cavity is located and the horizontal plane where the B port is located, the B groove is used for connecting another group of throttling cavities and the B port in the working state, the A groove, the P cavity, the B groove and the T cavity which are positioned in the plane where the A cavity is located are sequentially arranged at intervals and are respectively isolated by partition strips to form a group of oil circuit structures, the radian range corresponding to the partition strips at the two sides of the P cavity of the valve core covers the circumferential range of the corresponding A cavity on the working side of the valve sleeve, the radian range corresponding to the partition strips at the two sides of the T cavity of the valve core covers the circumferential range of the corresponding B cavity on the working side of the valve sleeve, and when the servo valve is in a zero position, the P port, the T port, the A port and the B port are mutually isolated; when the working state is in a working state, the cavity A is communicated with the groove A or the groove B, the cavity B is communicated with the groove B or the groove A, and the oil way is communicated and switched; the bottom outer ring of the central shaft of the valve core is sleeved with a valve core end cover, the valve core end cover is respectively provided with a lower convex positioning stop corresponding to the upper opening positions of the A groove and the B groove, the corresponding lower convex positioning stops are respectively embedded in the upper openings of the A groove and the B groove and sealed by glue, and the outer ring wall of the valve core is in clearance fit with the inner wall of the valve sleeve;
the positions of the groove A and the groove B are exchanged, and the functions of the whole structure are unchanged;
the two oil tanks or oil chambers of the same type are arranged at two ends of the corresponding diameter of the valve core, the diameter positions of the P chamber and the T chamber are mutually perpendicular, the diameter positions of the A chamber and the B chamber are mutually perpendicular, the center radian interval of the adjacent P chamber and the adjacent A chamber is 45 degrees, the two A chamber and B chamber on the valve sleeve are respectively arranged at two ends of the corresponding diameter of the valve sleeve inner chamber, and the diameter positions of the A chamber and the B chamber are mutually perpendicular;
the P cavity and the T cavity are groove bodies which are parallel to the central shaft of the valve core and are arranged from bottom to top;
the radian ranges of the P cavity and the T cavity are the same, so that the whole structure is convenient to manufacture;
the radian ranges of the cavity A and the cavity B are the same, so that the whole structure is convenient to manufacture;
the radian range of the cavity A is larger than that of the cavity P in the plane of the cavity A;
the height plane of the port A is positioned above the height plane of the port P, and the height plane of the port B is positioned below the height plane of the port P;
the valve core end cover is sleeved at the bottom position of the central shaft, the lower end face of the valve core end cover is tightly attached to the upper end face of the valve core main body part, the outer ring face of the valve core end cover is in clearance fit with the inner wall of the valve sleeve, and the valve core end cover is fixedly connected with the valve core main body part through mounting screws of circumferential ring cloth;
a gray ring is sleeved at the position of the central shaft of the valve core, which penetrates through the upper end cover, and a concave annular groove is arranged at the corresponding position of the upper end cover, and the gray ring is arranged in the concave annular groove;
the upper end cover is fixedly connected with the upper end ring surface of the valve sleeve through a first screw, an upper annular groove is formed in the upper end ring surface of the valve sleeve, a first sealing ring is arranged in the upper annular groove, and the first sealing ring is tightly attached to the corresponding contact surface of the upper end cover to realize the sealing between the valve sleeve and the upper end cover;
the lower end cover is fixedly connected with the lower end ring surface of the valve sleeve through a second screw, an annular boss is arranged on the lower end surface of the valve sleeve, a lower annular groove is arranged at the position, corresponding to the annular boss, of the upper end surface of the lower end cover, a second sealing ring is placed in the lower annular groove, and the annular boss is embedded in the lower annular groove and is pressed on the upper end surface of the second sealing ring, so that the valve sleeve and the lower end cover are sealed.
After the invention is adopted, the throttle cavity (A cavity and B cavity) is opened on the valve sleeve, and the upper port of the valve core switching oil way is sealed by combining the valve core end cover with the valve core, so that the leakage quantity of the end face is greatly reduced, the leakage quantity of the threaded plug-in type rotary direct-drive electro-hydraulic servo valve is reduced, and the power efficiency is improved.
Drawings
FIG. 1 is a schematic diagram of a front view structure of the present invention;
FIG. 2 is a schematic side view of the valve body assembly of the present invention;
FIG. 3 is a schematic view of the cross-sectional structure of A-A of FIG. 2;
FIG. 4 is a schematic top view of FIG. 2;
FIG. 5 is a schematic view of the B-B cross-section structure of FIG. 4;
FIG. 6 is a schematic view of the structure of the section C-C of FIG. 4;
FIG. 7 is a schematic front view of the valve cartridge of the present invention;
fig. 8 is a schematic plan view of the valve sleeve of the present invention;
FIG. 9 is a schematic view of the structure of section D-D of FIG. 8;
the names corresponding to the serial numbers in the figures are as follows:
the direct current brushless servo motor 1, the valve body assembly 2, the valve core 3, the valve sleeve 4, the upper end cover 5, the external thread 51, the lower end cover 6, the central positioning hole 61, the P port 7, the A cavity 9, the B cavity 10, the A port 11, the B port 12, the valve core end cover 13, the downward convex positioning stop 14, the P cavity 15, the T cavity 16, the A groove 17, the B groove 18, the parting bead 19, the central shaft 20, the mounting screw 21, the Gelai ring 22, the inward concave annular groove 23, the first screw 24, the upper annular groove 25, the first sealing ring 26, the second screw 27, the annular boss 28, the lower annular groove 29 and the second sealing ring 30.
Detailed Description
Novel screw thread cartridge type rotary direct-drive electrohydraulic servo valve, see fig. 1-9: the valve body assembly 2 comprises a valve core 3, a valve sleeve 4, an upper end cover 5 and a lower end cover 6, wherein an output shaft of the direct current brushless servo motor 1 is connected with an upper convex part of a central shaft 20 of the valve core 3, the direct current brushless servo motor 1 is fixedly arranged at the upper end of the upper end cover 5, the valve core 3 is arranged in an inner cavity of the valve sleeve 4, an external thread 51 is arranged on the outer circumferential surface of the upper end cover 5, the external thread 51 is used for being connected with the installation of an integrated valve block, the bottom of the valve core 3 is arranged in a central positioning hole 61 of the lower end cover 6, a P port 7 communicated with the inner cavity is arranged on the valve sleeve 4, different P ports 7 are arranged at different circumferential positions on the same plane, two groups of throttling cavities which are concave are arranged on the inner wall of the valve sleeve 4, in particular, an A cavity 9 and a B cavity 10 are arranged at different circumferential angular positions on the same plane of the inner wall circumference of the valve sleeve 4, a port 8 is arranged on the lower end cover 6, an A port 11 communicated with the outside, a port 12, a P port 11 and a port 11 are also arranged on the valve sleeve 4, the valve sleeve is arranged on the same plane, the valve core is in the same plane, the conditions that the valve core is switched between the valve core and the valve core is in the following structure, and the valve core is arranged on the same plane, and the valve core is in the different oil path structure: when the servo valve is in a zero position, the port P7, the port T8, the port A11 and the port B12 are isolated from each other; in the working state, the P port 7 is communicated with the A port 11 or the B port 12 through a valve core switching oil way, the T port 8 is communicated with the B port 12 or the A port 11 through a valve core switching oil way, and the P port 7 and the T port 8 are not simultaneously communicated with the A port 11 or the B port 12; the bottom outer ring of the central shaft 20 of the valve core 3 is sleeved with a valve core end cover 13, the valve core end cover 13 is respectively provided with a lower convex positioning stop 14 corresponding to the upper opening position of the valve core switching oil way, and the corresponding lower convex positioning stop 14 is respectively embedded in the upper opening of the valve core switching oil way and sealed by glue, and the outer ring wall of the valve core 3 is in clearance fit with the inner wall of the valve sleeve 4.
Two groups of oil way structures which are symmetrically arranged are arranged on the circumference of the outer annular wall of the valve core 3, each group of oil way structure comprises a P cavity 15, a T cavity 16, an A groove 17 and a B groove 18, the corresponding positions of the outer annular wall of the valve core 3 are respectively provided with a concave P cavity 15, a T cavity 16, an A groove 17 and a B groove 18, the height direction of the P cavity 15 covers the horizontal plane where the P port 7 is positioned and the horizontal plane where the A cavity 9 is positioned, the P cavity 15 is connected with the P port 7 and the A cavity 9, the height direction of the T cavity 16 covers the horizontal plane where the B cavity 10 is positioned, the bottom of the T cavity 16 penetrates through the valve core 3 and is communicated with the inlet of the T port 8, the T cavity 16 is connected with the T port 8 and the B cavity 10, the height direction of the A groove 17 covers the horizontal plane where the A cavity 9 is positioned and the horizontal plane where the A port 11 is positioned, the A groove 17 is used for connecting one group of throttling cavities and A ports 11, the height direction of the B groove 18 covers the horizontal plane where the B cavity 10 is located and the horizontal plane where the B port 12 is located in the working state of the A groove 17, the B groove 18 and the T groove 16 which are positioned in the plane where the A cavity 9 is located are sequentially arranged at intervals and are respectively isolated by the parting strips 19 to form a group of oil path structures, the radian range corresponding to the parting strips 19 on the two sides of the P cavity 15 of the valve core 3 covers the circumferential range corresponding to the A cavity 9 on the working edge of the valve sleeve 4, the radian range corresponding to the parting strips 19 on the two sides of the T cavity 16 of the valve core 3 covers the circumferential range corresponding to the B cavity 10 on the working edge of the valve sleeve 4, and when the servo valve is in a zero position, the P port 7, the T port 8, the A port 11 and the B port 12 are mutually isolated; in the working state, the cavity A9 is communicated with the groove A17 or the groove B18, the cavity B10 is communicated with the groove B18 or the groove A17, and the oil paths are communicated and switched; the bottom outer ring of the central shaft 20 of the valve core 3 is sleeved with a valve core end cover 13, the upper opening positions of the valve core end cover 13 corresponding to the A groove 17 and the B groove 18 are respectively provided with a lower convex positioning stop 14, and the corresponding lower convex positioning stops 14 are respectively embedded in the upper openings of the A groove 17 and the B groove 18 and sealed by glue, and the outer ring wall of the valve core 3 is in clearance fit with the inner wall of the valve sleeve 4;
the positions of the groove A17 and the groove B18 are interchanged, and the functions of the whole structure are unchanged;
the two oil grooves or oil cavities of the same type are arranged at two ends of the corresponding diameter of the valve core 3, the diameter positions of the P cavity 15 and the T cavity 16 are mutually perpendicular, the diameter positions of the A cavity 17 and the B cavity 18 are mutually perpendicular, the center radian interval of the adjacent P cavity 15 and the center radian interval of the A cavity 17 are 45 degrees, the two A cavities 9 and the two B cavities 10 on the valve sleeve 4 are respectively arranged at two ends of the corresponding diameter of the inner cavity of the valve sleeve 4, and the diameter positions of the A cavity 9 and the B cavity 10 are mutually perpendicular;
the P cavity 15 and the T cavity 16 are groove bodies which are arranged parallel to the central shaft of the valve core 3 from bottom to top;
the radian ranges of the P cavity 15 and the T cavity 16 are the same, so that the whole structure is convenient to manufacture; the radian ranges of the cavity A9 and the cavity B10 are the same, so that the whole structure is convenient to manufacture;
the radian range of the A cavity 9 is larger than the radian range of the P cavity 15 in the plane of the A cavity 9;
the height plane of the port A11 is positioned above the height plane of the port P7, and the height plane of the port B12 is positioned below the height plane of the port P7;
the valve core end cover 13 is sleeved at the bottom of the central shaft 20, the lower end surface of the valve core end cover 13 is tightly attached to the upper end surface of the main body part of the valve core 3, the outer ring surface of the valve core end cover 13 is in clearance fit with the inner wall of the valve sleeve 4, and the valve core end cover 13 is fixedly connected with the main body part of the valve core 3 through mounting screws 21 distributed in a circumferential ring;
the position of the upper convex part of the central shaft 20 of the valve core 3 penetrating through the upper end cover 5 is sleeved with a gray ring 22, the corresponding position of the upper end cover 5 is provided with a concave annular groove 23, and the gray ring 22 is internally arranged in the concave annular groove 23;
the upper end cover 5 is fixedly connected with the upper end ring surface of the valve sleeve 4 through a first screw 24, an upper annular groove 25 is formed in the upper end ring surface of the valve sleeve 4, a first sealing ring 26 is arranged in the upper annular groove 25, and the first sealing ring 26 is tightly attached to the corresponding contact surface of the upper end cover 5 to realize the sealing between the valve sleeve 4 and the upper end cover 5;
the lower end cover 6 is fixedly connected with the lower end ring surface of the valve sleeve 4 through a second screw 27, an annular boss 28 is arranged on the lower end surface of the valve sleeve 4, a lower annular groove 29 is arranged on the upper end surface of the lower end cover 6 corresponding to the annular boss 28, a second sealing ring 30 is arranged in the lower annular groove 29, and the annular boss 28 is embedded in the lower annular groove 29 and is pressed on the upper end surface of the second sealing ring 30, so that the valve sleeve 4 and the lower end cover 6 are sealed.
The working principle is as follows: when the servo valve is in a zero position, the P port, the T port, the A port and the B port are isolated from each other as shown in FIG. 3; at the moment, the P port is communicated with the A cavity through the P cavity, the A port is communicated with the lower part of the A groove, the T port is communicated with the B cavity through the T cavity, and the B port is communicated with the lower part of the B groove;
in the working state, taking the figure 3 as a zero position, enabling the valve core a to slightly rotate clockwise by an angle, enabling the cavity A to be communicated with the groove A, the cavity B to be communicated with the groove B, enabling the oil way to be communicated and switched, and enabling the port P to be communicated with the port A and the port T to be communicated with the port B; b, the valve core rotates anticlockwise by a micro angle, the cavity A is communicated with the groove B, the cavity B is communicated with the groove A, the oil way is communicated and switched, and at the moment, the port P is communicated with the port B, and the port T is communicated with the port A;
the throttle cavity (A cavity and B cavity) is formed in the valve sleeve, and the upper port of the valve core switching oil way is sealed by combining the valve core end cover with the valve core, so that the leakage quantity of the end face is greatly reduced, the leakage quantity of the threaded plug-in type rotary direct-drive electro-hydraulic servo valve is reduced, and the power efficiency is improved;
the direct-current servo motor is adopted as an electrohydraulic conversion part of the threaded plug-in type rotary direct-drive electrohydraulic servo valve, so that the frequent start and stop requirements in the working process of the servo valve are met, and the adaptability of the servo motor to external load changes is enhanced; zero jitter of the servo motor caused by mechanical characteristics is reduced, so that the stability of the electrohydraulic servo valve in a zero position is enhanced; the controllability of the servo motor on a zero accessory is enhanced by properly prolonging the frequent start and stop time of the servo motor; by adding the valve core end cover and fixing the valve core end cover by using bolts through glue adding, the end face leakage is reduced.
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 (5)
1. The utility model provides a novel rotatory direct-drive electrohydraulic servo valve of screw thread cartridge formula, its includes brushless servo motor of direct current, valve body subassembly, the valve body subassembly is including case, valve pocket, upper end cover, lower extreme, the output shaft of brushless servo motor of direct current the epirelief portion of the center pin of case, brushless servo motor of direct current adorn admittedly in the upper end of upper end cover, the intracavity of valve pocket has been arranged the case, the outer peripheral face of upper end cover is equipped with the external screw thread, the external screw thread is used for being connected with the installation of integrated valve piece, the bottom of case install in the center locating hole of lower extreme, its characterized in that: the valve sleeve is provided with P ports communicated with the inner cavity, different P ports are arranged at different circumferential positions on the same plane, two groups of inward concave throttling cavities are arranged on the inner wall of the valve sleeve and are respectively an A cavity and a B cavity, the A cavity and the B cavity are arranged at different circumferential angle positions on the same plane of the inner wall circumference of the valve sleeve, the valve sleeve is also provided with an A port and a B port communicated with the outside, the lower end cover is provided with a T port, the P port, the A port and the B port are arranged on planes at different heights of the valve sleeve, a valve core switching oil way structure is arranged on the outer annular wall of the valve core, two groups of oil way structures which are symmetrically arranged are arranged on the circumference of the outer annular wall of the valve core, each group of oil way structures comprises a P cavity, a T cavity, an A groove and a B groove, the corresponding positions of the outer annular wall of the valve core are respectively provided with an inward concave P cavity, a T cavity, an A groove and a B groove, the height direction of the P cavity covers the horizontal plane where the P port is located and the horizontal plane where the A cavity is located, the P cavity is connected with the P port and the A cavity, the height direction of the T cavity covers the horizontal plane where the B cavity is located, the bottom of the T cavity penetrates through the valve core and is communicated to the inlet of the T port, the T cavity is connected with the T port and the B cavity, the height direction of the A groove covers the horizontal plane where the A cavity is located and the horizontal plane where the A port is located, the A groove is used for connecting one group of throttling cavity and the A port in the working state of the A groove, the horizontal plane where the B cavity is located and the horizontal plane where the B port is located in the working state of the B groove is used for connecting the other group of throttling cavity and the B port, the A groove, the P cavity, the B groove and the T cavity which are located in the plane where the A cavity is located are sequentially arranged at intervals and are respectively isolated by partition bars to form one group of oil path structures, the arc ranges corresponding to the parting strips at the two sides of the P cavity of the valve core cover the circumferential ranges of the corresponding A cavity on the working edge of the valve sleeve, the arc ranges corresponding to the parting strips at the two sides of the T cavity of the valve core cover the circumferential ranges of the corresponding B cavity on the working edge of the valve sleeve, and when the servo valve is in a zero position, the P port, the T port, the A port and the B port are isolated from each other; when the working state is in a working state, the cavity A is communicated with the groove A or the groove B, the cavity B is communicated with the groove B or the groove A, and the oil way is communicated and switched; the bottom outer ring of the central shaft of the valve core is sleeved with a valve core end cover, the valve core end cover is respectively provided with a lower convex positioning stop corresponding to the upper opening positions of the A groove and the B groove, the corresponding lower convex positioning stops are respectively embedded in the upper openings of the A groove and the B groove and sealed by glue, and the outer ring wall of the valve core is in clearance fit with the inner wall of the valve sleeve;
the two oil tanks or oil chambers of the same type are arranged at two ends of the corresponding diameter of the valve core, the diameter positions of the P chamber and the T chamber are mutually perpendicular, the diameter positions of the A chamber and the B chamber are mutually perpendicular, the center radian interval of the adjacent P chamber and the adjacent A chamber is 45 degrees, the two A chamber and B chamber on the valve sleeve are respectively arranged at two ends of the corresponding diameter of the valve sleeve inner chamber, and the diameter positions of the A chamber and the B chamber are mutually perpendicular;
the P cavity and the T cavity are groove bodies which are parallel to the central shaft of the valve core and are arranged from bottom to top; the radian ranges of the P cavity and the T cavity are the same; the radian ranges of the cavity A and the cavity B are the same; the radian range of the cavity A is larger than that of the cavity P in the plane of the cavity A;
the height plane of the port A is positioned above the height plane of the port P, and the height plane of the port B is positioned below the height plane of the port P;
the valve core end cover is sleeved at the bottom of the central shaft, the lower end face of the valve core end cover is tightly attached to the upper end face of the valve core main body part, the outer ring face of the valve core end cover is in clearance fit with the inner wall of the valve sleeve, and the valve core end cover is fixedly connected with the valve core main body part through mounting screws of circumferential ring cloth.
2. The novel threaded cartridge rotary direct-drive electro-hydraulic servo valve as set forth in claim 1, wherein: and the positions of the groove A and the groove B are exchanged.
3. The novel threaded cartridge rotary direct-drive electro-hydraulic servo valve as set forth in claim 1, wherein: the upper convex part of the central shaft of the valve core penetrates through the upper end cover, a gray ring is sleeved at the position of the central shaft of the valve core, an inward concave annular groove is formed in the corresponding position of the upper end cover, and the gray ring is arranged in the inward concave annular groove.
4. The novel threaded cartridge rotary direct-drive electro-hydraulic servo valve as set forth in claim 1, wherein: the upper end cover is fixedly connected with the upper end ring surface of the valve sleeve through a first screw, an upper annular groove is formed in the upper end ring surface of the valve sleeve, a first sealing ring is arranged in the upper annular groove, and the first sealing ring is tightly attached to the corresponding contact surface of the upper end cover.
5. The novel threaded cartridge rotary direct-drive electro-hydraulic servo valve as set forth in claim 1, wherein: the lower end cover is fixedly connected with the lower end ring surface of the valve sleeve through a second screw, an annular boss is arranged on the lower end surface of the valve sleeve, a lower annular groove is arranged on the upper end surface of the lower end cover corresponding to the annular boss, a second sealing ring is arranged in the lower annular groove, and the annular boss is embedded in the lower annular groove and is pressed on the upper end surface of the second sealing ring.
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| CN201910057335.XA CN109578361B (en) | 2019-01-22 | 2019-01-22 | Novel screw thread cartridge formula rotatory electric liquid servo valve that directly drives |
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| CN110553081B (en) * | 2019-09-29 | 2024-07-05 | 上海羿弓氢能科技有限公司 | Hydraulic reversing valve and hydraulic reversing device |
| 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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