CN102979777A - Rotary valve type large torque hydraulic corner self-servo valve - Google Patents
Rotary valve type large torque hydraulic corner self-servo valve Download PDFInfo
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- CN102979777A CN102979777A CN2012105140254A CN201210514025A CN102979777A CN 102979777 A CN102979777 A CN 102979777A CN 2012105140254 A CN2012105140254 A CN 2012105140254A CN 201210514025 A CN201210514025 A CN 201210514025A CN 102979777 A CN102979777 A CN 102979777A
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Abstract
The invention relates to a rotary valve type large torque hydraulic corner self-servo valve, which has the technical scheme that: a valve body (10) is concentrically arranged in a cylinder body cylindrical cavity (18); a valve sleeve (8) is concentrically arranged in a valve body cylindrical cavity (27); a right end of a valve plug (9) penetrates through the valve sleeve (8) so as to be concentrically arranged in the valve body cylindrical cavity (27); and an output shaft of a motor (3) is in key joint with an inner hole (46) on a left end of the valve plug (9) concentrically. Fixed stops (7) are respectively arranged on an upper part and a lower part of an inner wall of a cylinder body (4), and are in movable fit with the valve body (10); two blades (17) are fixed on an outer wall of the valve body cylindrical cavity (27), are arranged at an angle of 180 degrees, and are in movable fit with the cylinder body (4); and the fixed stops (7) and the blades (17) are in staggered arrangement with the blades (17). The rotary valve type large torque hydraulic corner self-servo valve has the characteristics of simple structure, easiness in processing, balance in stressing of the valve plug, large output torque, good dynamic property, flow gain linear, quick respond speed, and high control accuracy.
Description
Technical field
The invention belongs to the technical field of servovalve, be specifically related to a kind of rotary valve high-torque hydraulic corner self-servo valve.
Background technique
The hydraulic corner servo techniques is that hydraulic pressure is combined with motor technology, utilizes advantage separately, directly drives spool with the little moment of motor valve port is opened, and allows high pressure oil act on the valve body, and then obtains large output torque.Hydraulic corner self-servo valve is the core parts in the hydraulic control system, it has precision height, swift characteristics, in high-precision electro-mechanical system, the airborne drive system of Aero-Space, large-scale experiment equipment, have a wide range of applications, thereby obtain domestic and international scientific and technical personnel's concern.
At present, the people such as associate professor Zhu Xinglong of domestic Yangzhou University are in the research hydraulic servo-joint, proposed first the servo concept of hydraulic corner (research of the .3 degrees of freedom hydraulic servo-joint dynamic modeling and simulation such as Zhu Xinglong. the machine design and manufacture engineering, 2002,31 (6): 23-25.), built-in and reduce hydraulic knuckle size aspect and done useful exploration for hydraulic servomechanism, obtained certain achievement in research, but the hydraulic card clamping force that spool is subject to and frictional force are all larger, the spool dynamic property degenerates, and servo blind area is larger.
" a kind of easy control hydraulic corner self-servo valve " (CN 201210033081.6) patented technology has overcome above-mentioned existing problem, this valve core of servo valve has is convenient to preparation, spool force in radial and axial force be each self balancing all, dynamic property is good, the little characteristics with being easy to control in servo blind area, but there is complex structure, particularly there are the internal oil channel of much complex in spool and valve pocket inside, be difficult to guarantee machining accuracy, it is large not and adopted circular valve port design also to exist output torque, it is nonlinear causing its flow gain, and then has produced the not high enough problem of precision.
Summary of the invention
The present invention is intended to overcome the prior art defective, purpose provide a kind of simple in structure, be easy to processing, spool stress balance, output torque is large, dynamic property good, flow gain is linear, fast response time, the rotary valve high-torque hydraulic corner self-servo valve that control accuracy is high.
For achieving the above object, the technical solution used in the present invention is: described rotary valve high-torque hydraulic corner self-servo valve comprises connecting cover, motor, cylinder body, valve pocket, spool, valve body, fixed stop and blade.
Connecting cover is installed in the left end of cylinder body concentrically, valve body is installed in the cylinder body cylindrical cavity concentrically, and right end cap is installed in the right-hand member of cylinder body, and the output shaft of valve body stretches out right end cap, flange plate is installed in the output shaft end of valve body, and sealing cover is mounted by means of bolts on the right-hand member of flange plate.
Fixed stop is equipped with in the positive top of inboard wall of cylinder block and positive bottom, and fixed stop and valve body are for movingly; The outer wall of valve cylinder-shaped cavity fixedly is equipped with two blades, and two blades are 180 ° of layouts, and blade and cylinder body are for movingly; Fixed stop and blade interlaced arrangement.
Valve pocket is installed in the valve cylinder-shaped cavity concentrically, the left side of valve pocket and the left side of valve body are fixed together by straight pin, the spool left end is installed in the small cylindrical opening of cylinder body concentrically, the spool right-hand member passes valve pocket and is installed in concentrically in the valve cylinder-shaped cavity, motor is fixed on the cylinder body, the concentricity key connecting of endoporus of the output shaft of motor and spool left end.
Directly over the connecting cover and under corresponding connecting cover low pressure oil passage and the connecting cover high-pressure oil passage of being provided with, the outlet of connecting cover low pressure oil passage is low pressure oil outlet T, the entrance of connecting cover high-pressure oil passage is high pressure oil import P, and the center position of connecting cover is provided with the power line passage.The positive top of cylinder body radially is provided with the first low pressure oil passage, in axial direction is provided with the second low pressure oil passage, and the first low pressure oil passage and the second low pressure oil passage communicate, and the second low pressure oil passage communicates with connecting cover low pressure oil passage; The positive bottom of cylinder body in axial direction is provided with the cylinder body high-pressure oil passage, and the cylinder body high-pressure oil passage communicates with the connecting cover high-pressure oil passage.
The entrance of the first low pressure oil passage directly by valve body first radially the low pressure oilhole communicate with the left T mouth of valve pocket, rectangle groove on the first annular boss of the left T mouth of valve pocket and spool communicates, rectangle groove on the first annular boss of spool communicates with the left A mouth of valve pocket, and first rectangle valve port and the three rectangle valve port of the left A mouth of valve pocket by valve body communicates with corresponding the first active chamber and the 3rd active chamber.
The entrance of the second low pressure oil passage communicates with the low pressure oil circular groove of valve body, the low pressure oil circular groove of valve body and inner low pressure oil passage by second radially the low pressure oilhole communicate, second radially the low pressure oilhole communicate with the right T mouth of valve pocket, rectangle groove on the Fourth Ring shape boss of the right T mouth of valve pocket and spool communicates, rectangle groove on the Fourth Ring shape boss of spool communicates with the right B mouth of valve pocket, and second rectangle valve port and the four rectangle valve port of the right B mouth of valve pocket by valve body communicates with corresponding the second active chamber and the 4th active chamber.
The outlet of cylinder body high-pressure oil passage communicates with the high pressure oil circular groove of valve body, the high pressure oil circular groove of valve body communicates with internal high pressure oil passage by the high-pressure radial oilhole, internal high pressure oil passage communicates respectively with the left P mouth of valve pocket and the right P mouth of valve pocket, rectangle groove on the second annular boss of the left P mouth of valve pocket and spool communicates, rectangle groove on the second annular boss of spool communicates with the right A mouth of valve pocket, and first rectangle valve port and the three rectangle valve port of the right A mouth of valve pocket by valve body communicates with corresponding the first active chamber and the 3rd active chamber.
Rectangle groove on the 3rd annular boss of the right P mouth of valve pocket and spool communicates, rectangle groove on the 3rd annular boss of spool communicates with the left B mouth of valve pocket, and second rectangle valve port and the four rectangle valve port of the left B mouth of valve pocket by valve body communicates with corresponding the second active chamber and the 4th active chamber.
Described valve body is comprised of hollow cylinder, cylindrical body boss and output shaft from left to right successively.Be provided with two valve seal grooves at the output shaft near cylindrical body boss place, the end face of output shaft has low pressure oil entrance and high pressure oil outlet, and low pressure oil entrance and high pressure oil export with corresponding inside low pressure oil passage and high-pressure radial oilhole and communicate.
The external diameter of cylindrical body boss is identical with the nominal size of cylinder body cylindrical cavity internal diameter, the cylndrical surface of cylindrical body boss has four valve seal grooves, have the low pressure oil circular groove between two the valve seal grooves in the left side, have the second low pressure oilhole radially in the low pressure oil circular groove, have the high pressure oil circular groove between two the valve seal grooves in the right, have the high-pressure radial oilhole in the high pressure oil circular groove, second radially low pressure oilhole and high-pressure radial oilhole corresponding two plain lines on valve body differ 180 °.
Near having two valve seal grooves on the cylndrical surface at hollow cylinder left end place, have the first low pressure oilhole radially between two valve seal grooves, valve cylinder-shaped cavity internal diameter is identical with the nominal size of valve pocket external diameter.Be provided with the second rectangle valve port and the 4th rectangle valve port at the hollow cylinder near the cylindrical body boss, the second rectangle valve port and the 4th rectangle valve port are the axle center and are arranged symmetrically with, be provided with first rectangle valve port and the 3rd rectangle valve port at the hollow cylinder near the valve seal groove on the right, the first rectangle valve port and the 3rd rectangle valve port are the axle center and are arranged symmetrically with; The first rectangle valve port, the second rectangle valve port, the 3rd rectangle valve port and the 4th rectangle valve port measure-alike.
The plain line of high-pressure radial oilhole is positioned at the middle of the plain line at the plain line at the second rectangle valve port center and the 3rd rectangle valve port center, and the angle of the plain line at the plain line at the second rectangle valve port center and the 3rd rectangle valve port center is θ
In the formula (1): b
1Arc length for the blade inwall;
b
2Be the arc length of rectangle valve port on hollow cylinder;
R is the external diameter of hollow cylinder.
Be provided with the endoporus that connects with motor output shaft, the left end place of close spool has the core body seal groove described spool left end coaxial line.Spool is provided with the first annular boss, the second annular boss, the 3rd annular boss, Fourth Ring shape boss and five rings shape boss from left to right, the right of the first annular boss, the second annular boss, the 3rd annular boss and Fourth Ring shape boss has two measure-alike rectangle grooves, two rectangle grooves are 180 ° of distributions, and per two rectangle grooves are positioned on separately the same circumference.Two rectangle groove center lines of the first annular boss and two rectangle groove center lines of the 3rd annular boss are being positioned on two plain lines of axle center symmetry respectively, two rectangle groove center lines of the second annular boss and two rectangle groove center lines of Fourth Ring shape boss lay respectively in addition two plain lines of axle center symmetry, and every plain line differs 90 °; The first annular boss and five rings shape boss at spool have two logical oil grooves, two logical oil grooves are 180 ° of distributions, per two logical oil grooves are positioned on separately the same circumference, and the center line of two logical oil grooves respectively axle center is symmetrically located on two plain lines.
Described valve pocket is comprised of six annular boss and five grooves, and annular boss and groove are alternately arranged.Have two rectangular opening on two grooves on the left side and the right, two rectangular opening are 180 ° of layouts, and two rectangular opening on the groove of the left side are the left T mouth of valve pocket, and two rectangular opening on the groove of the right are the right T mouth of valve pocket; The left side and the right of three grooves in the middle of the valve pocket have one group of rectangular opening, and every group of rectangular opening is comprised of two rectangular opening that mutually are 180 ° of layouts.Rectangular opening on five grooves is measure-alike, and the rectangular opening center line on five grooves all is positioned on each self-corresponding same plain line, and the rectangle groove of the size of the rectangular opening on five grooves and four boss of spool is measure-alike.
The left surface of every group of rectangular opening on the left side on middle three grooves and the right flank of adjacent annular boss are same plane, and the right flank of every group of rectangular opening on the right on middle three grooves and the left surface of adjacent annular boss are same plane.Six groups of rectangular opening in the middle of the valve pocket from left to right are followed successively by the left A mouth of valve pocket, the right A mouth of valve pocket, the left P mouth of valve pocket, the right P mouth of valve pocket, the left B mouth of valve pocket and the right B mouth of valve pocket.
Described fixed stop is strip, and the length of fixed stop is length poor of the cylindrical body boss of the length of cylinder body cylindrical cavity and valve body, and the upper lower camber side of fixed stop is poor to be poor half of the hollow cylinder body diameter of the internal diameter of cylinder body cylindrical cavity and valve body.The lower camber side center of fixed stop is provided with the strip seal groove along axial direction, the equal in length of strip seal groove and fixed stop, and the strip seal groove is embedded with the block Stamping Steel Ribbon.
Described blade is strip, and the length of blade is length poor of the cylindrical body boss of the length of cylinder body cylindrical cavity and valve body, and the upper lower camber side of blade is poor to be poor half of the hollow cylinder body diameter of the internal diameter of cylinder body cylindrical cavity and valve body; The lower camber side center of blade is provided with the strip seal groove along axial direction, the equal in length of strip seal groove and blade, and the strip seal groove is embedded with the runner sealing bar.
Owing to adopt technique scheme, high pressure oil import P of the present invention enters the high-pressure oil passage of cylinder body by the high-pressure oil passage of connecting cover, then enter the high pressure oil circular groove of valve body, enter again the internal high pressure oil passage of valve body by the high-pressure radial oilhole, enter at last the left P mouth of valve pocket and the right P mouth of valve pocket.
When spool is rotated counterclockwise with respect to valve pocket, high pressure oil is entered the rectangle groove on the second annular boss of spool by the left P mouth of valve pocket, then enter the right A mouth of valve pocket, the first rectangle valve port and the 3rd rectangle valve port by valve body enters respectively the first active chamber and the 3rd active chamber at last, the promotion blade is rotated counterclockwise, make valve body follow valve core movement, the low pressure oil of the second active chamber and the 4th active chamber then enters respectively the right B mouth of valve pocket by the second rectangle valve port and the 4th rectangle valve port of valve body, enter again the rectangle groove on the Fourth Ring shape boss of spool, enter at last the right T mouth of valve pocket.
When spool turns clockwise with respect to valve pocket, high pressure oil is entered the rectangle groove on the 3rd annular boss of spool by the right P mouth of valve pocket, then enter the left B mouth of valve pocket, the second rectangle valve port and the 4th rectangle valve port by valve body enters respectively the second active chamber and the 4th active chamber at last, the promotion blade turns clockwise, make valve body follow valve core movement, the low pressure oil of the first active chamber and the 3rd active chamber then enters respectively the left A mouth of valve pocket by the first rectangle valve port and the 3rd rectangle valve port of valve body, enter again the rectangle groove on the first annular boss of spool, enter at last the left T mouth of valve pocket.
The low pressure oil of the left T mouth of valve pocket by valve body first radially the low pressure oilhole directly enter the first low pressure oil passage of cylinder body, enter low pressure oil outlet T through the low pressure oil passage of connecting cover again and progressively reflux; The low pressure oil of the right T mouth of valve pocket then by valve body second radially the low pressure oilhole enter the low pressure oil circular groove of valve body, enter again the low pressure oil duct of connecting cover through the second low pressure oil passage of cylinder body, progressively reflux by low pressure oil outlet T at last.
When the left A mouth of valve pocket communicates with the first active chamber and the 3rd active chamber, the left B mouth of valve pocket then communicates with the second active chamber and the 4th active chamber, and the right A mouth of valve pocket and the right B mouth of valve pocket then all do not communicate with the first active chamber, the 3rd active chamber, the second active chamber and the 4th active chamber; When the right A mouth of valve pocket communicates with the first active chamber and the 3rd active chamber, the right B mouth of valve pocket communicates with the second active chamber and the 4th active chamber, and the left A mouth of valve pocket and the left B mouth of valve pocket then all do not communicate with the first active chamber, the 3rd active chamber, the second active chamber and the 4th active chamber.Except above-mentioned situation, the valve pocket valve port does not all communicate with the first active chamber, the 3rd active chamber, the second active chamber and the 4th active chamber.
Compared with the prior art the present invention has following good effect:
1) the present invention is divided into two parts with valve body, has increased a valve pocket, controls the oil circuit of high pressure oil and low pressure oil with the rectangle valve port of valve pocket; Because oil circuit is only joined oil through surface and the valve pocket of spool among the present invention, spool does not have complicated internal oil channel, and valve pocket only is provided with several groups of valve ports in addition, thus simple in structure, being easy to processing, machining accuracy guarantees easily.
2) so the symmetrical flow of spool of the present invention and valve pocket is the balanced radial force that spool and valve pocket are subject to; In addition when spool is rotated counterclockwise with respect to valve pocket, high pressure oil is entered the rectangle groove on the second annular boss of spool by the left P mouth of valve pocket, then enter the right A mouth of valve pocket, the first rectangle valve port and the 3rd rectangle valve port by valve body enters respectively the first active chamber and the 3rd active chamber at last, the power that high pressure oil acts on the valve body is all pointed to the axle center, the opposite sign but equal magnitude of these power; In like manner, when spool turns clockwise with respect to valve pocket, high pressure oil is entered the rectangle groove on the 3rd annular boss of spool by the right P mouth of valve pocket, then enter the left B mouth of valve pocket, the second rectangle valve port and the 4th rectangle valve port by valve body enters respectively the second active chamber and the 4th active chamber at last, the power that high pressure oil acts on the valve body is also pointed to the axle center, these power are opposite sign but equal magnitude also, as seen valve body force in radial balance, thus the suffered resistance of valve body and hydraulic card clamping force all very little, dynamic property good; Because equal each self balancing of valve pocket, spool and valve body force in radial among the present invention, the valve port distortion is little, and quality of fit is high, and lap is little, near zero lap, so the servo blind area of rotary valve of the present invention is little, dynamic property good.
3) because valve pocket of the present invention and spool all adopt the rectangle valve port, can obtain linear flow gain, improve control accuracy, so control accuracy is high.
4) the present invention is in the process of servovalve motion, because there are four in active chamber, and always has two to be that high pressure or two are low pressure simultaneously simultaneously in the active chamber, so just formed a pair of torque of couple, and output torque is large.
Therefore, the present invention have simple in structure, be easy to process, the spool stress balance, output torque is large, dynamic property good, flow gain is linear, fast response time and the high characteristics of control accuracy.
Description of drawings
Fig. 1 is a kind of structural representation of the present invention;
Fig. 2 is the A-A generalized section of Fig. 1;
Fig. 3 is the structural representation of cylinder body 4 among Fig. 1;
Fig. 4 is the generalized section of valve body 10 among Fig. 2;
Fig. 5 is the structural representation of Fig. 4;
Fig. 6 is the F-F generalized section of Fig. 5;
Fig. 7 is the G-G generalized section of Fig. 5;
Fig. 8 is the structural representation of valve pocket 8 among Fig. 1;
Fig. 9 is the H-H generalized section of Fig. 8;
Figure 10 is the structural representation of spool 9 among Fig. 1;
Figure 11 is the I-I generalized section of Figure 10;
Figure 12 is the B-B generalized section of Fig. 1;
Figure 13 is the C-C generalized section of Fig. 1;
Figure 14 is the D-D generalized section of Fig. 1;
Figure 15 is the E-E generalized section of Fig. 1.
Embodiment
The invention will be further described below in conjunction with the drawings and specific embodiments, is not the restriction to its protection domain.
Embodiment 1
A kind of rotary valve high-torque hydraulic corner self-servo valve, as depicted in figs. 1 and 2, rotary valve high-torque hydraulic corner self-servo valve comprises connecting cover 1, motor 3, cylinder body 4, valve pocket 8, spool 9, valve body 10, fixed stop 7 and blade 17.
As depicted in figs. 1 and 2, connecting cover 1 is installed in the left end of cylinder body 4 concentrically, valve body 10 is installed in as shown in Figure 3 the cylinder body cylindrical cavity 18 concentrically, right end cap 11 is installed in the right-hand member of cylinder body 4, the output shaft of valve body 10 stretches out right end cap 11, flange plate 12 is installed in the output shaft end of valve body 10, and sealing cover 13 is mounted by means of bolts on the right-hand member of flange plate 12.
As shown in Figure 1, fixed stop 7 is equipped with in the positive top of cylinder body 4 inwalls and positive bottom, and fixed stop 7 and valve body 10 are for movingly, as shown in Figure 2, the outer wall of valve cylinder-shaped cavity 27 fixedly is equipped with 17, two blades 17 of two blades and is 180 ° of layouts, and blade 17 and cylinder body 4 are for movingly.Fixed stop 7 and blade 17 interlaced arrangement.During use, the initial position that fixed stop 7 and blade are 17 transfers to 90 °.
As shown in Figure 1, valve pocket 8 is installed in as shown in Figure 4 the valve cylinder-shaped cavity 27 concentrically, the left side of the left side of valve pocket 8 and valve body 10 is fixed together by straight pin, spool 9 left ends are installed in the small cylindrical opening 19 of cylinder body shown in Figure 34 concentrically, spool 9 right-hand members pass valve pocket 8 and are installed in concentrically in the valve cylinder-shaped cavity 27, motor 3 is fixed on the cylinder body 4, the endoporus 46 concentricity key connecting of the output shaft of motor 3 and spool shown in Figure 11 9 left ends.
As shown in Figure 1, directly over the connecting cover 1 and under corresponding connecting cover low pressure oil passage 2 and the connecting cover high-pressure oil passage 15 of being provided with, the outlet of connecting cover low pressure oil passage 2 is low pressure oil outlet T, the entrance of connecting cover high-pressure oil passage 15 is high pressure oil import P; The center position of connecting cover 1 is provided with power line passage 16.The positive top of cylinder body 4 in axial direction is provided with the second low pressure oil passage 6, radially is provided with the first low pressure oil passage 5, the first low pressure oil passages 5 and the second low pressure oil passage 6 and communicates, and the second low pressure oil passage 6 communicates with connecting cover low pressure oil passage 2; The positive bottom of cylinder body 4 in axial direction is provided with cylinder body high-pressure oil passage 14, and cylinder body high-pressure oil passage 14 communicates with connecting cover high-pressure oil passage 15.
As shown in Figure 1 and Figure 4, the entrance of the first low pressure oil passage 5 directly by valve body 10 first radially low pressure oilhole 20 communicate with the left T mouth 32 of valve pocket shown in Figure 8, rectangle groove on the first annular boss 41 of the left T mouth 32 of valve pocket and spool 9 shown in Figure 10 communicates, rectangle groove on the first annular boss 41 of spool 9 communicates with the left A mouth 33 of valve pocket, and the first rectangle valve port 30 of the valve body 10 of the left A mouth 33 of valve pocket by as shown in figure 15 and the 3rd rectangle valve port 29 communicate with corresponding the first active chamber 47 and the 3rd active chamber 49.
As shown in Figure 1 and Figure 4, the entrance of the second low pressure oil passage 6 communicates with the low pressure oil circular groove 21 of valve body 10, the low pressure oil circular groove 21 of valve body 10 and inner low pressure oil passage 23 by second radially low pressure oilhole 22 communicate; Second radially low pressure oilhole 22 communicate with the right T mouth 39 of valve pocket shown in Figure 8, rectangle groove on the Fourth Ring shape boss 44 of the right T mouth 39 of valve pocket and spool 9 as shown in figure 10 communicates, rectangle groove on the Fourth Ring shape boss 44 of spool 9 communicates with the right B mouth 38 of valve pocket, and second rectangle valve port 28 and the four rectangle valve port 31 of the right B mouth 38 of valve pocket by valve body 10 shown in Figure 13 communicates with corresponding the second active chamber 48 and the 4th active chamber 50.
As shown in Figure 1 and Figure 4, the outlet of cylinder body high-pressure oil passage 14 communicates with the high pressure oil circular groove 24 of valve body 10, the high pressure oil circular groove 24 of valve body 10 communicates with internal high pressure oil passage 26 by high-pressure radial oilhole 25, internal high pressure oil passage 26 communicates respectively with the left P mouth 35 of valve pocket shown in Figure 8 and the right P mouth 36 of valve pocket, rectangle groove on the second annular boss 42 of the left P mouth 35 of valve pocket and spool 9 shown in Figure 10 communicates, rectangle groove on the second annular boss 42 of spool 9 communicates with the right A mouth 34 of valve pocket, and first rectangle valve port 30 and the three rectangle valve port 29 of the right A mouth 34 of valve pocket by valve body 10 shown in Figure 12 communicates with corresponding the first active chamber 47 and the 3rd active chamber 49.
Such as Fig. 8 and shown in Figure 10, the rectangle groove on the 3rd annular boss 43 of the right P mouth 36 of valve pocket and spool 9 communicates, and the rectangle groove on the 3rd annular boss 43 of spool 9 communicates with the left B mouth 37 of valve pocket; Second rectangle valve port 28 and the four rectangle valve port 31 of the left B mouth 37 of valve pocket by valve body 10 as shown in figure 14 communicates with corresponding the second active chamber 48 and the 4th active chamber 50.
As shown in Figure 4, the described valve body 10 of present embodiment is comprised of hollow cylinder, cylindrical body boss and output shaft from left to right successively.Be provided with two valve seal grooves at the output shaft near cylindrical body boss place, the end face of output shaft has low pressure oil entrance and high pressure oil outlet, and low pressure oil entrance and high pressure oil export with corresponding inside low pressure oil passage 23 and high-pressure radial oilhole 25 and communicate.
The external diameter of cylindrical body boss is identical with the nominal size of cylinder body cylindrical cavity 18 internal diameters shown in Figure 3, the cylndrical surface of cylindrical body boss has four valve seal grooves, have low pressure oil circular groove 21 between two the valve seal grooves in the left side, have the second low pressure oilhole 22 radially in the low pressure oil circular groove 21, have high pressure oil circular groove 24 between two the valve seal grooves in the right, radially low pressure oilhole 22 and high-pressure radial oilhole 25 corresponding two plain lines on valve body 10 differ 180 ° to have high-pressure radial oilhole 25, the second in the high pressure oil circular groove 24.
Near having two valve seal grooves on the cylndrical surface at hollow cylinder left end place, have the first low pressure oilhole 20 radially between two valve seal grooves, valve cylinder-shaped cavity 27 internal diameters are identical with the nominal size of valve pocket 8 external diameters; Be provided with the second rectangle valve port 28 and the 4th rectangle valve port 31 at the hollow cylinder near the cylindrical body boss, the second rectangle valve port 28 and the 4th rectangle valve port 31 are the axle center and are arranged symmetrically with, being provided with first rectangle valve port 30 and the 3rd rectangle valve port 29, the first rectangle valve ports 30 and the 3rd rectangle valve port 29 at the hollow cylinder near the valve seal groove on the right is the axle center and is arranged symmetrically with; The first rectangle valve port 30, the second rectangle valve port 28, the 3rd rectangle valve port 29 and the 4th rectangle valve port 31 measure-alike.
As shown in Figure 5, the plain line of high-pressure radial oilhole 25 is positioned at the middle of the plain line at the plain line at the second rectangle valve port 28 centers and the 3rd rectangle valve port 29 centers, the angle of the plain line at the plain line at the second rectangle valve port 28 centers and the 3rd rectangle valve port 29 centers is θ, and its size is
B in the formula
1Arc length for blade 17 inwalls;
b
2Be the arc length of rectangle valve port on hollow cylinder;
R is the external diameter of hollow cylinder.
As shown in Figure 10 and Figure 11, be provided with the endoporus 46 that connects with motor 3 output shafts, the left end place of close spool 9 has the core body seal groove described spool 9 left end coaxial lines; Spool 9 is provided with the first annular boss 41, the second annular boss 42, the 3rd annular boss 43, Fourth Ring shape boss 44 and five rings shape boss 45 from left to right, the right of the first annular boss 41, the second annular boss 42, the 3rd annular boss 43 and Fourth Ring shape boss 44 has two measure-alike rectangle grooves, two rectangle grooves are 180 ° of distributions, and per two rectangle grooves are positioned on separately the same circumference; Two rectangle groove center lines of the first annular boss 41 and two rectangle groove center lines of the 3rd annular boss 43 are being positioned on two plain lines of axle center symmetry respectively, two rectangle groove center lines of the second annular boss 42 and two rectangle groove center lines of Fourth Ring shape boss 44 lay respectively in addition two plain lines of axle center symmetry, and every plain line differs 90 °;
The first annular boss 41 and five rings shape boss 45 at spool have two logical oil grooves 40, two logical oil grooves 40 are 180 ° of distributions, per two logical oil grooves 40 are positioned on separately the same circumference, and the center line of two logical oil grooves 40 respectively axle center is symmetrically located on two plain lines.
Such as Fig. 8 and shown in Figure 9, described valve pocket 8 is comprised of six annular boss and five grooves, and annular boss and groove are alternately arranged.Have two rectangular opening on two grooves on the left side and the right, two rectangular opening are 180 ° of layouts, and two rectangular opening on the groove of the left side are the left T mouth 32 of valve pocket, and two rectangular opening on the groove of the right are the right T mouth 39 of valve pocket; The left side and the right of three grooves in the middle of the valve pocket 8 have one group of rectangular opening, and every group of rectangular opening is comprised of two rectangular opening that mutually are 180 ° of layouts; Rectangular opening on five grooves is measure-alike, and the rectangular opening center line on five grooves all is positioned on each self-corresponding same plain line, and the rectangle groove of the size of the rectangular opening on five grooves and four boss of spool 9 is measure-alike;
The left surface of every group of rectangular opening on the left side on middle three grooves and the right flank of adjacent annular boss are same plane, and the right flank of every group of rectangular opening on the right on middle three grooves and the left surface of adjacent annular boss are same plane; Six groups of rectangular opening in the middle of the valve pocket 8 from left to right are followed successively by the left A mouth 33 of valve pocket, the right A mouth 34 of valve pocket, the left P mouth 35 of valve pocket, the right P mouth 36 of valve pocket, the left B mouth 37 of valve pocket and the right B mouth 38 of valve pocket.
Such as Fig. 1 and shown in Figure 12, described fixed stop 7 is strip, the length of fixed stop 7 is length poor of the cylindrical body boss of the length of cylinder body cylindrical cavity 18 and valve body 10, and the upper lower camber side of fixed stop 7 is poor to be poor half of the hollow cylinder body diameter of the internal diameter of cylinder body cylindrical cavity 18 and valve body 10; The lower camber side center of fixed stop 7 is provided with the strip seal groove along axial direction, the equal in length of strip seal groove and fixed stop 7, and the strip seal groove is embedded with the block Stamping Steel Ribbon.
Such as Fig. 2 and shown in Figure 12, described blade 17 is strip, the length of blade 17 is length poor of the cylindrical body boss of the length of cylinder body cylindrical cavity 18 and valve body 10, and the upper lower camber side of blade 17 is poor to be poor half of the hollow cylinder body diameter of the internal diameter of cylinder body cylindrical cavity 18 and valve body 10; The lower camber side center of blade 17 is provided with the strip seal groove along axial direction, the equal in length of strip seal groove and blade 17, and the strip seal groove is embedded with the runner sealing bar.
The high pressure oil import P of this embodiment enters the high-pressure oil passage 14 of cylinder body 4 by the high-pressure oil passage 15 of connecting cover 1, then enter the high pressure oil circular groove 24 of valve body 10, enter again the internal high pressure oil passage 26 of valve body 10 by high-pressure radial oilhole 25, enter at last the left P mouth 35 of valve pocket and the right P mouth 36 of valve pocket.
When spool 9 is rotated counterclockwise with respect to valve pocket 8, high pressure oil is entered the rectangle groove on the second annular boss 42 of spool 9 by the left P mouth 35 of valve pocket, then enter the right A mouth 34 of valve pocket, the first rectangle valve port 30 and the 3rd rectangle valve port 29 by valve body 10 enters respectively the first active chamber 47 and the 3rd active chamber 49 at last, promoting blade 17 is rotated counterclockwise, make valve body 10 follow spool 9 motions, the low pressure oil of the second active chamber 48 and the 4th active chamber 50 then enters respectively the right B mouth 38 of valve pocket by the second rectangle valve port 28 and the 4th rectangle valve port 31 of valve body 10, enter again the rectangle groove on the Fourth Ring shape boss 44 of spool 9, enter at last the right T mouth 39 of valve pocket.
When spool 9 turns clockwise with respect to valve pocket 8, high pressure oil is entered the rectangle groove on the 3rd annular boss 43 of spool 9 by the right P mouth 36 of valve pocket, then enter the left B mouth 37 of valve pocket, the second rectangle valve port 28 and the 4th rectangle valve port 31 by valve body 10 enters respectively the second active chamber 48 and the 4th active chamber 50 at last, promoting blade 17 turns clockwise, make valve body 10 follow spool 9 motions, the low pressure oil of the first active chamber 47 and the 3rd active chamber 49 then enters respectively the left A mouth 33 of valve pocket by the first rectangle valve port 30 and the 3rd rectangle valve port 29 of valve body 10, enter again the rectangle groove on the first annular boss 41 of spool 9, enter at last the left T mouth 32 of valve pocket.
The low pressure oil of the left T mouth 32 of valve pocket by valve body 10 first radially low pressure oilhole 20 directly enter the first low pressure oil passage 5 of cylinder body 4, enter low pressure oil outlet T through the low pressure oil passage 2 of connecting cover 1 again and progressively reflux; The low pressure oil of the right T mouth 39 of valve pocket then by valve body 10 second radially low pressure oilhole 22 enter the low pressure oil circular groove 21 of valve body 10, enter again the low pressure oil duct 2 of connecting cover 1 through the second low pressure oil passage 6 of cylinder body 4, progressively reflux by low pressure oil outlet T at last.
When the left A mouth of valve pocket communicates with the first active chamber and the 3rd active chamber, the left B mouth of valve pocket then communicates with the second active chamber and the 4th active chamber, and the right A mouth of valve pocket and the right B mouth of valve pocket then all do not communicate with the first active chamber, the 3rd active chamber, the second active chamber and the 4th active chamber; When the right A mouth of valve pocket communicates with the first active chamber and the 3rd active chamber, the right B mouth of valve pocket communicates with the second active chamber and the 4th active chamber, and the left A mouth of valve pocket and the left B mouth of valve pocket then all do not communicate with the first active chamber, the 3rd active chamber, the second active chamber and the 4th active chamber.Except above-mentioned situation, the valve pocket valve port does not all communicate with the first active chamber, the 3rd active chamber, the second active chamber and the 4th active chamber.
Compared with the prior art this embodiment has following good effect:
1) this embodiment is divided into two parts with valve body 10, has increased a valve pocket 8, controls the oil circuit of high pressure oil and low pressure oil with the rectangle valve port of valve pocket 8; Because oil circuit is only joined oil through surface and the valve pocket 8 of spool 9 in this embodiment, spool 9 does not have complicated internal oil channel, and valve pocket 8 only is provided with several groups of valve ports in addition, thus simple in structure, being easy to processing, machining accuracy guarantees easily.
2) so spool 9 and valve pocket 8 symmetrical flows of this embodiment are the balanced radial force that spool 9 and valve pocket 8 are subject to; In addition when spool 9 is rotated counterclockwise with respect to valve pocket 8, high pressure oil is entered the rectangle groove on the second annular boss 42 of spool 9 by the left P mouth 35 of valve pocket, then enter the right A mouth 34 of valve pocket, the first rectangle valve port 30 and the 3rd rectangle valve port 29 by valve body 10 enters respectively the first active chamber 47 and the 3rd active chamber 49 at last, the power that high pressure oil acts on the valve body 10 is all pointed to the axle center, the opposite sign but equal magnitude of these power; In like manner, when spool 9 turns clockwise with respect to valve pocket 8, high pressure oil is entered the rectangle groove on the 3rd annular boss 43 of spool 9 by the right P mouth 36 of valve pocket, then enter the left B mouth 37 of valve pocket, the second rectangle valve port 28 and the 4th rectangle valve port 31 by valve body 10 enters respectively the second active chamber 48 and the 4th active chamber 50 at last, the power that high pressure oil acts on the valve body 10 is also pointed to the axle center, these power are opposite sign but equal magnitude also, as seen valve body 10 force in radial balances, thus valve body 10 suffered resistances and hydraulic card clamping force all very little, dynamic property good; Because equal each self balancing of valve pocket 8, spool 9 and valve body 10 force in radial in this embodiment, the valve port distortion is little, and quality of fit is high, and lap is little, near zero lap, so the servo blind area of the rotary valve of this embodiment is little, dynamic property good.
3) because valve pocket 8 and the spool 9 of this embodiment all adopt the rectangle valve port, can obtain linear flow gain, improve control accuracy, so control accuracy is high.
4) this embodiment is in the process of servovalve motion, because there are four in active chamber, and always has two to be that high pressure or two are low pressure simultaneously simultaneously in the active chamber, so just formed a pair of torque of couple, and output torque is large.
Therefore, this embodiment have simple in structure, be easy to process, the spool stress balance, output torque is large, dynamic property good, flow gain is linear, fast response time and the high characteristics of control accuracy.
Claims (6)
1. a rotary valve high-torque hydraulic corner self-servo valve is characterized in that described rotary valve high-torque hydraulic corner self-servo valve comprises connecting cover (1), motor (3), cylinder body (4), valve pocket (8), spool (9), valve body (10), fixed stop (7) and blade (17);
Connecting cover (1) is installed in the left end of cylinder body (4) concentrically, valve body (10) is installed in the cylinder body cylindrical cavity (18) concentrically, right end cap (11) is installed in the right-hand member of cylinder body (4), the output shaft of valve body (10) stretches out right end cap (11), flange plate (12) is installed in the output shaft end of valve body (10), and sealing cover (13) is mounted by means of bolts on the right-hand member of flange plate (12);
Fixed stop (7) is equipped with in the positive top of cylinder body (4) inwall and positive bottom, and fixed stop (7) and valve body (10) are for movingly; The outer wall of valve cylinder-shaped cavity (27) fixedly is equipped with two blades (17), and two blades (17) are 180 ° of layouts, and blade (17) and cylinder body (4) are for movingly; Fixed stop (7) and blade (17) interlaced arrangement;
Valve pocket (8) is installed in the valve cylinder-shaped cavity (27) concentrically, the left side of the left side of valve pocket (8) and valve body (10) is fixed together by straight pin, spool (9) left end is installed in the small cylindrical opening (19) of cylinder body (4) concentrically, spool (9) right-hand member passes valve pocket (8) and is installed in concentrically in the valve cylinder-shaped cavity (27), motor (3) is fixed on the cylinder body (4), the concentricity key connecting of endoporus (46) of the output shaft of motor (3) and spool (9) left end;
Directly over the connecting cover (1) and under corresponding connecting cover low pressure oil passage (2) and the connecting cover high-pressure oil passage (15) of being provided with, the outlet of connecting cover low pressure oil passage (2) is low pressure oil outlet T, the entrance of connecting cover high-pressure oil passage (15) is high pressure oil import P, and the center position of connecting cover (1) is provided with power line passage (16); The positive top of cylinder body (4) radially is provided with the first low pressure oil passage (5), in axial direction be provided with the second low pressure oil passage (6), the first low pressure oil passage (5) and the second low pressure oil passage (6) communicate, and the second low pressure oil passage (6) communicates with connecting cover low pressure oil passage (2); The positive bottom of cylinder body (4) in axial direction is provided with cylinder body high-pressure oil passage (14), and cylinder body high-pressure oil passage (14) communicates with connecting cover high-pressure oil passage (15);
The entrance of the first low pressure oil passage (5) directly by valve body (10) first radially low pressure oilhole (20) communicate with the left T mouth of valve pocket (32), rectangle groove on first annular boss (41) of the left T mouth of valve pocket (32) and spool (9) communicates, rectangle groove on first annular boss (41) of spool (9) communicates with the left A mouth of valve pocket (33), and first rectangle valve port (30) and the three rectangle valve port (29) of the left A mouth of valve pocket (33) by valve body (10) communicates with corresponding the first active chamber (47) and the 3rd active chamber (49);
The entrance of the second low pressure oil passage (6) communicates with the low pressure oil circular groove (21) of valve body (10), the low pressure oil circular groove (21) of valve body (10) and inner low pressure oil passage (23) by second radially low pressure oilhole (22) communicate, second radially low pressure oilhole (22) communicate with the right T mouth of valve pocket (39), rectangle groove on the Fourth Ring shape boss (44) of the right T mouth of valve pocket (39) and spool (9) communicates, rectangle groove on the Fourth Ring shape boss (44) of spool (9) communicates with the right B mouth of valve pocket (38), and second rectangle valve port (28) and the four rectangle valve port (31) of the right B mouth of valve pocket (38) by valve body (10) communicates with corresponding the second active chamber (48) and the 4th active chamber (50);
The outlet of cylinder body high-pressure oil passage (14) communicates with the high pressure oil circular groove (24) of valve body (10), the high pressure oil circular groove (24) of valve body (10) communicates with internal high pressure oil passage (26) by high-pressure radial oilhole (25), internal high pressure oil passage (26) communicates respectively with the left P mouth of valve pocket (35) and the right P mouth of valve pocket (36), rectangle groove on second annular boss (42) of the left P mouth of valve pocket (35) and spool (9) communicates, rectangle groove on second annular boss (42) of spool (9) communicates with the right A mouth of valve pocket (34), and first rectangle valve port (30) and the three rectangle valve port (29) of the right A mouth of valve pocket (34) by valve body (10) communicates with corresponding the first active chamber (47) and the 3rd active chamber (49);
Rectangle groove on the 3rd annular boss (43) of the right P mouth of valve pocket (36) and spool (9) communicates, rectangle groove on the 3rd annular boss (43) of spool (9) communicates with the left B mouth of valve pocket (37), and second rectangle valve port (28) and the four rectangle valve port (31) of the left B mouth of valve pocket (37) by valve body (10) communicates with corresponding the second active chamber (48) and the 4th active chamber (50).
2. rotary valve high-torque hydraulic corner self-servo valve according to claim 1 is characterized in that described valve body (10) is comprised of hollow cylinder, cylindrical body boss and output shaft from left to right successively; Be provided with two valve seal grooves at the output shaft near cylindrical body boss place, the end face of output shaft has low pressure oil entrance and high pressure oil outlet, and low pressure oil entrance and high pressure oil export with corresponding inside low pressure oil passage (23) and high-pressure radial oilhole (25) and communicate;
The external diameter of cylindrical body boss is identical with the nominal size of cylinder body cylindrical cavity (18) internal diameter, the cylndrical surface of cylindrical body boss has four valve seal grooves, have low pressure oil circular groove (21) between two the valve seal grooves in the left side, have the second low pressure oilhole (22) radially in the low pressure oil circular groove (21), have high pressure oil circular groove (24) between two the valve seal grooves in the right, have high-pressure radial oilhole (25) in the high pressure oil circular groove (24), second radially low pressure oilhole (22) and high-pressure radial oilhole (25) differ 180 ° at the upper corresponding two plain lines of valve body (10);
Near having two valve seal grooves on the cylndrical surface at hollow cylinder left end place, have the first low pressure oilhole (20) radially between two valve seal grooves, valve cylinder-shaped cavity (27) internal diameter is identical with the nominal size of valve pocket (8) external diameter; Be provided with the second rectangle valve port (28) and the 4th rectangle valve port (31) at the hollow cylinder near the cylindrical body boss, the second rectangle valve port (28) is the axle center with the 4th rectangle valve port (31) and is arranged symmetrically with, be provided with first rectangle valve port (30) and the 3rd rectangle valve port (29) at the hollow cylinder near the valve seal groove on the right, the first rectangle valve port (30) and the 3rd rectangle valve port (29) are the axle center and are arranged symmetrically with; The first rectangle valve port (30), the second rectangle valve port (28), the 3rd rectangle valve port (29) and the 4th rectangle valve port (31) measure-alike.
The plain line of high-pressure radial oilhole (25) is positioned at the middle of the plain line at the plain line at the second rectangle valve port (28) center and the 3rd rectangle valve port (29) center, the angle of the plain line at the plain line at the second rectangle valve port (28) center and the 3rd rectangle valve port (29) center is θ, and its size is
In the formula (1): b
1Arc length for blade (17) inwall;
b
2Be the arc length of rectangle valve port on hollow cylinder;
R is the external diameter of hollow cylinder.
3. rotary valve high-torque hydraulic corner self-servo valve according to claim 1, be provided with the endoporus (46) that connects with motor (3) output shaft, the left end place of close spool (9) has the core body seal groove with it is characterized in that described spool (9) left end coaxial line; Spool (9) is provided with the first annular boss (41), the second annular boss (42), the 3rd annular boss (43), Fourth Ring shape boss (44) and five rings shape boss (45) from left to right, the right of the first annular boss (41), the second annular boss (42), the 3rd annular boss (43) and Fourth Ring shape boss (44) has two measure-alike rectangle grooves, two rectangle grooves are 180 ° of distributions, and per two rectangle grooves are positioned on separately the same circumference; Two rectangle groove center lines of the first annular boss (41) and two rectangle groove center lines of the 3rd annular boss (43) are being positioned on two plain lines of axle center symmetry respectively, two rectangle groove center lines of the second annular boss (42) and two rectangle groove center lines of Fourth Ring shape boss (44) lay respectively in addition two plain lines of axle center symmetry, and every plain line differs 90 °; The first annular boss (41) and five rings shape boss (45) at spool have two logical oil grooves (40), two logical oil grooves (40) are 180 ° of distributions, per two logical oil grooves (40) are positioned on separately the same circumference, and the center line of two logical oil grooves (40) respectively axle center is symmetrically located on two plain lines.
4. rotary valve high-torque hydraulic corner self-servo valve according to claim 1 is characterized in that described valve pocket (8) is comprised of six annular boss and five grooves, and annular boss and groove are alternately arranged; Have two rectangular opening on two grooves on the left side and the right, two rectangular opening are 180 ° of layouts, and two rectangular opening on the groove of the left side are the left T mouth of valve pocket (32), and two rectangular opening on the groove of the right are the right T mouth of valve pocket (39); The left side and the right of three grooves in the middle of the valve pocket (8) have one group of rectangular opening, and every group of rectangular opening is comprised of two rectangular opening that mutually are 180 ° of layouts; Rectangular opening on five grooves is measure-alike, and the rectangular opening center line on five grooves all is positioned on each self-corresponding same plain line, and the rectangle groove of the size of the rectangular opening on five grooves and four boss of spool (9) is measure-alike;
The left surface of every group of rectangular opening on the left side on middle three grooves and the right flank of adjacent annular boss are same plane, and the right flank of every group of rectangular opening on the right on middle three grooves and the left surface of adjacent annular boss are same plane; Six groups of rectangular opening in the middle of the valve pocket (8) from left to right are followed successively by the left A mouth of valve pocket (33), the right A mouth of valve pocket (34), the left P mouth of valve pocket (35), the right P mouth of valve pocket (36), the left B mouth of valve pocket (37) and the right B mouth of valve pocket (38).
5. rotary valve high-torque hydraulic corner self-servo valve according to claim 1, it is characterized in that described fixed stop (7) is strip, the length of fixed stop (7) is length poor of the cylindrical body boss of the length of cylinder body cylindrical cavity (18) and valve body (10), and the upper lower camber side of fixed stop (7) is poor to be poor half of the hollow cylinder body diameter of the internal diameter of cylinder body cylindrical cavity (18) and valve body (10); The lower camber side center of fixed stop (7) is provided with the strip seal groove along axial direction, the equal in length of strip seal groove and fixed stop (7), and the strip seal groove is embedded with the block Stamping Steel Ribbon.
6. rotary valve high-torque hydraulic corner self-servo valve according to claim 1, it is characterized in that described blade (17) is strip, the length of blade (17) is length poor of the cylindrical body boss of the length of cylinder body cylindrical cavity (18) and valve body (10), and the upper lower camber side of blade (17) is poor to be poor half of the hollow cylinder body diameter of the internal diameter of cylinder body cylindrical cavity (18) and valve body (10); The lower camber side center of blade (17) is provided with the strip seal groove along axial direction, the equal in length of strip seal groove and blade (17), and the strip seal groove is embedded with the runner sealing bar.
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| CN201210514025.4A CN102979777B (en) | 2012-12-03 | 2012-12-03 | Rotary valve type large torque hydraulic corner self-servo valve |
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| CN103352887A (en) * | 2013-07-18 | 2013-10-16 | 武汉科技大学 | Single-vane water pressure self-servo rotary valve |
| CN104179746A (en) * | 2014-08-15 | 2014-12-03 | 武汉科技大学 | Self-servo hydraulic robot joint capable of continuously rotating |
| CN104806592A (en) * | 2015-03-16 | 2015-07-29 | 西安交通大学 | Flow-adjustable double side plate type three-position four-way rotary valve |
| CN109483589A (en) * | 2018-12-28 | 2019-03-19 | 武汉科技大学 | A kind of hydraulic corner easy to process is from the submissive driver of servo |
| CN112983919A (en) * | 2021-03-31 | 2021-06-18 | 同济大学 | Large-impulse hydraulic power mechanism based on shaft flow distribution |
| CN113370202A (en) * | 2021-07-08 | 2021-09-10 | 武汉科技大学 | Double-blade hydraulic servo compliant driver |
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| CN109483589A (en) * | 2018-12-28 | 2019-03-19 | 武汉科技大学 | A kind of hydraulic corner easy to process is from the submissive driver of servo |
| CN109483589B (en) * | 2018-12-28 | 2024-01-05 | 武汉科技大学 | Hydraulic corner self-servo compliant driver easy to process |
| CN112983919A (en) * | 2021-03-31 | 2021-06-18 | 同济大学 | Large-impulse hydraulic power mechanism based on shaft flow distribution |
| CN113370202A (en) * | 2021-07-08 | 2021-09-10 | 武汉科技大学 | Double-blade hydraulic servo compliant driver |
| CN114776853A (en) * | 2022-03-18 | 2022-07-22 | 衢州学院 | Worm-gear type overflow valve with wide pressure regulating range and strong pollution resistance |
| CN114776853B (en) * | 2022-03-18 | 2023-04-25 | 衢州学院 | Worm-gear overflow valve with wide pressure regulating range and strong pollution resistance |
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Effective date of registration: 20181220 Address after: 430081 No. 743 Peace Avenue, Qingshan District, Wuhan City, Hubei Province Patentee after: Wuhan University of Science and Technology Asset Management Co., Ltd. Address before: 430081 construction of Qingshan District, Hubei, Wuhan Patentee before: Wuhan University of Science and Technology |