CN102913496B - Bi-directional full-bridge 2D electro-hydraulic proportional directional valve - Google Patents

Bi-directional full-bridge 2D electro-hydraulic proportional directional valve Download PDF

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CN102913496B
CN102913496B CN201210410588.9A CN201210410588A CN102913496B CN 102913496 B CN102913496 B CN 102913496B CN 201210410588 A CN201210410588 A CN 201210410588A CN 102913496 B CN102913496 B CN 102913496B
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hand
pressure
valve
coupling
sleeve
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CN102913496A (en
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李胜
左强
阮健
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Zhejiang University of Technology ZJUT
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Zhejiang University of Technology ZJUT
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Abstract

The invention discloses a bi-directional full-bridge 2D electro-hydraulic proportional directional valve, which comprises a valve body and valve cores, wherein a left-end proportion electro-magnet, a left-end torsional coupling, one valve core, a right-end torsional coupling and a right-end proportion electro-magnet are coaxially connected; a left-end sensitive cavity is formed by the left end of the valve core, a left-end sleeve and a left-end fixing plate; a right-end sensitive cavity is formed by the right end of the valve core, the left-end sleeve and a right-end fixing plate; a pair of axisymmetric high-pressure holes and a pair of axisymmetric low-pressure holes are respectively arranged on the surfaces of circular beads at two ends of the valve cores inside the sensitive cavities at two ends; a pair of axisymmetric perceptive channels is arranged at the inner surface of the valve body outside the sensitive cavities at two ends; one end of each perceptive channel is communicated with each sensitive cavity; and the other end of each perceptive channel is covered on the area between the adjacent high-pressure hole and the low-pressure hole. The bi-directional full-bridge 2D electro-hydraulic proportional directional valve not only has the characteristics of large flow, high work pressure and the like of a common controlled electro-hydraulic proportional valve, but also is capable of achieving the proportional control function just as a direct operated proportional valve under zero pressure (decompression).

Description

Two-way full-bridge 2D electrohydraulic proportional directional valve
Technical field
The present invention relates to electro-hydraulic proportional valve, especially a kind of electrohydraulic proportional directional valve.
Background technique
Electro-hydraulic proportional valve is the core parts of electro-hydraulic proportional control technology, it is based on traditional industrial hydraulic control valve, adopt electrically analog-mechanical switching device, be displacement signal by transform electric, by input electric signal instruction, the parameter such as the flow stream pressure of hydraulic control system, flow or direction pro rata continuously.Electro-hydraulic proportional valve is compared with the electrohydraulic control in servo-control system, although its performance also has a certain distance in some aspects.But its significant advantage is that contamination resistance is strong, decreases the job failure caused due to pollution, improves working stability and the reliability of hydraulic system, be therefore more suitable for industrial process.On the other hand, the cost of Proportional valve is lower than servovalve, and do not comprise responsive and accurate parts, more easily operate and maintain, obtain in many hydraulic control occasions and applied widely, as ceramic floor brick pressure machine, the band steel constant tensile control being with steel to roll, pressurized container fatigue life test machine, hudraulic lift motion and control system, the control of metal-cutting machine tool working table movement, rolling mill pressure and control system, Presseshydraulic, tube bender and plastic injection machine etc.
The defect that in prior art, electro-hydraulic proportional valve exists: hydraulic power is large, spool is subject to frictional force and oil contamination affects and occurs " clamping stagnation " phenomenon.
Summary of the invention
In order to the hydraulic power overcoming existing electro-hydraulic proportional valve is large, spool is subject to frictional force and oil contamination affects and occurs the deficiency of " clamping stagnation " phenomenon, the invention provides and a kind ofly not only have that common control type of leading electro-hydraulic proportional valve flow is large, working pressure high, and can overcome and lead control level oil circuit decompression or pressure is too low makes whole valve cannot normally work and lead the larger deficiency of control level leakage flow, make valve under zero-pressure (decompression), also can realize the two-way full-bridge 2D electrohydraulic proportional directional valve of proportional control function as direct action type proportional valve.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of two-way full-bridge 2D electrohydraulic proportional directional valve, comprise valve body and spool, described spool is installed in rotation in valve body, described two-way full-bridge 2D electrohydraulic proportional directional valve also comprises left end proportion electro-magnet, right-hand member proportion electro-magnet, left end pressure in order to axial pressure to be converted to moment of torsion turns round coupling and right-hand member pressure turns round coupling, described left end proportion electro-magnet, left end pressure turns round coupling, spool, right-hand member pressure turns round coupling and the coaxial connection of right-hand member proportion electro-magnet, the input end that output shaft and the described left end pressure of described left end proportion electro-magnet turn round coupling contacts, the output terminal that described left end pressure turns round coupling is fixedly connected with described spool left end, the input end that output shaft and the described right-hand member pressure of described right-hand member proportion electro-magnet turn round coupling contacts, and the output terminal that described right-hand member pressure turns round coupling is fixedly connected with described spool right-hand member,
Described left end pressure is turned round coupling and is set with left end sleeve outward, described left end sleeve is connected with left end fixed plate, described left end fixed plate is connected with left end proportion electro-magnet, described right-hand member pressure is turned round coupling and is set with right-hand member sleeve outward, described right-hand member sleeve is connected with right-hand member fixed plate, and described right-hand member fixed plate is connected with right-hand member proportion electro-magnet; The left end of described spool, left end sleeve, left end fixed plate form left end sensitive cavity, the right-hand member of spool, left end sleeve and right-hand member fixed plate form right-hand member sensitive cavity, shoulder surface, spool two ends in the sensitive cavity of two ends has a pair axisymmetric pressure hole and a pair axisymmetric low pressure hole, the internal surface of the valve body outside the sensitive cavity of two ends is provided with a pair and axisymmetricly experiences passage, described one end experiencing passage is communicated with described sensitive cavity, and the described the other end experiencing passage covers the region between adjacent pressure hole and low pressure hole.
Further, described left end pressure is turned round coupling and is comprised left end pressure and turn round coupling a section, left end support spring, left end reed, left end pressure turns round coupling b section, left end steel ball and left end slip snap ring, described left end pressure is turned round coupling b section and is contacted with left end proportion electro-magnet output shaft, described left end reed one end and left end pressure are turned round coupling b section and are connected, the described left end reed the other end and left end pressure are turned round coupling a section and are connected, described left end turns round coupling b section by left end steel ball and left end sleeve connection, left end bush outer sleeve dress left end slides, described left end sleeve lining is provided with the hemisphere type groove turning round the axial motion of coupling b section for left end pressure, left end pressure turns round precompression one section of supported spring between coupling b section and valve body.Certainly, described right-hand member pressure is turned round coupling the pressure of other types also can be selected to turn round coupling.
Described right-hand member pressure is turned round coupling and is comprised right-hand member pressure and turn round coupling a section, right-hand member supported spring, right-hand member reed, right-hand member pressure turns round coupling b section, right-hand member steel ball and right-hand member slip snap ring, described right-hand member pressure is turned round coupling b section and is contacted with right-hand member proportion electro-magnet output shaft, described right-hand member reed one end and right-hand member pressure are turned round coupling b section and are connected, the described right-hand member reed the other end and right-hand member pressure are turned round coupling a section and are connected, described right-hand member turns round coupling b section by right-hand member steel ball and right-hand member sleeve connection, right-hand member bush outer sleeve dress right-hand member slides, described right-hand member sleeve lining is provided with the hemisphere type groove turning round the axial motion of coupling b section for right-hand member pressure, right-hand member pressure turns round precompression one section of supported spring between coupling b section and valve body.Certainly, described right-hand member pressure is turned round coupling the pressure of other types also can be selected to turn round coupling.
Plug is installed at the two ends of described spool, and described sleeve one end is connected with described fixed plate radial seal by O RunddichtringO, and the described sleeve the other end is connected with described valve body one end radial seal by O RunddichtringO.
In the present invention, " continuous control " of proportional direction valve, in fact except reaching the effect of liquid stream commutation, also regulates valve port opening by controlling party to the position of valve core.Therefore, proportional direction valve is a kind of compound control valve having flow control and direction controlling two kinds of functions concurrently.
Beneficial effect of the present invention is mainly manifested in:
1, for proportion electro-magnet because magnetic saturation thrust output is limited, propose pressure and turn round amplification actuation techniques, proportion electro-magnet is amplified the driving force of spool, effectively eliminate the adverse effect that the non-linear factor comparative example characteristics such as the frictional force between spool and spool bore cause, simultaneously, proportion electro-magnet and pressure are turned round coupling and are all operated in wet type environment, and surface friction drag is little, and heat dispersion is superior;
2, realize leading control type electric-hydraulic proportion commutation (throttling) valve function with the rotation of spool and two freedom of movement of slip, by valve core rotation, flowed friction bridge road delivery pressure is changed, and then produce the axial motion of static pressure actuating valve core, effectively can overcome the adverse effect that hydraulic power (Bernouilli force) causes under high pressure, large discharge, effectively improve axially locating (main valve opening) precision of spool;
3, two-way full-bridge 2D electrohydraulic proportional directional valve not only has that common control type of leading electro-hydraulic proportional valve flow is large, working pressure high feature, and also can realize two-way proportional controlling functions as direct action type proportional valve under zero-pressure (decompression).
Accompanying drawing explanation
Fig. 1 is the structural principle schematic diagram of two-way full-bridge 2D electrohydraulic proportional directional valve.
Fig. 2 is the structural principle schematic diagram that pressure turns round coupling.
Fig. 3 is valve core structure schematic diagram.
Fig. 4 a, 4b and 4c are working principle schematic diagram of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
With reference to Fig. 1 ~ Fig. 4 c, a kind of two-way full-bridge 2D electrohydraulic proportional directional valve, comprise left end proportion electro-magnet 2, left end pressure turns round coupling a section 28, left end sleeve 29, left end support spring 30, left end reed 6, left end pressure turns round coupling b section 32, left end fixed plate 3, left end slip snap ring 5, left plug ring 8, leftly experience passage 9, valve body 10, spool 11, right plug ring 26, rightly experience passage 12, right-hand member sleeve 14, right-hand member slip snap ring 15, left end fixed plate 18, left end proportion electro-magnet 19, right-hand member pressure turns round coupling a section 25, right-hand member supported spring 23, right-hand member reed 22, right-hand member pressure turns round coupling b section 21, O RunddichtringO 17, left end steel ball 4 and right-hand member steel ball 16, caging bolt 7 and 13, fixing bolt 1, 20, 24, 27 and 31.
Described proportion electro-magnet 2 and 19 lays respectively at valve body 10 left end and right-hand member as driving the electromechanical converter of two-way full-bridge 2D electrohydraulic proportional directional valve, is connected with 20 respectively by screw 1 with left end fixed plate 3 with right-hand member fixed plate 18.
It is the structure that the straight line motion realizing proportion electro-magnet armature transfers the twist motion of spool to that pressure turns round coupling.In this process, the feature of 2D valve hydraulic pressure Dao Kongqiao road Pressure gain large (small corner can make the pressure of sensitive cavity d and g that larger change occurs) can be made full use of, by turning round the appropriate design of coupling to pressure, by driving the torsional moment of valve core rotation to amplify, the adverse effect of the non-linear factor comparative example characteristics such as the frictional force between spool and spool bore is made to be reduced to minimum degree.Turn round coupling for left end pressure, as Fig. 2, comprise screw 31, pressure turn round coupling a section 28, reed 6, screw 27, pressure turn round coupling b section 32, left end steel ball 4 and sleeve 29.Sleeve 29 left end and fixed plate 3 keep radial seal, and sleeve 29 right-hand member and valve body 10 keep radial seal.
Turn round coupling due to whole pressure to be all immersed in fluid, spool 11 coordinates with sleeve 29, fixed plate 3 and forms sensitive cavity d, and spool 11 shoulder near sensitive cavity d end offers two on the surface to axisymmetric pressure hole b and low pressure hole c.The internal surface of valve body 10 left end offers a pair axisymmetric straight trough, for experiencing passage 9, the one end and the sensitive cavity d that experience passage 9 communicate, and the other end and pressure hole b and low pressure hole c form resistance half-bridge, the pressure that resistance half-bridge controls in sensitive cavity d by experiencing passage 9.The internal surface of valve body 10 right-hand member also offers a pair axisymmetric straight trough, for experiencing passage 12, the one end and the sensitive cavity g that experience passage 12 communicate, and the other end and pressure hole f and low pressure hole e form resistance half-bridge, the pressure that resistance half-bridge controls in sensitive cavity g by experiencing passage 12.
The working principle of the present embodiment: two-way full-bridge 2D electrohydraulic proportional directional valve structural principle is shown in Fig. 1, it is the medium tache connecting spool and proportion electro-magnet that pressure turns round coupling, and its a section and valve core rod connect firmly, and b section end face contacts with the push rod of proportion electro-magnet.Turn round the rotation of coupling b section to limit pressure, but do not affect its axial direct acting, its circumferential embedded distribution four steel balls and the effect of sleeve (stuck by slip snap ring) inwall hemisphere type groove.When proportion electro-magnet is energized, the thrust of generation turns round coupling b section end face in pressure, makes pressure turn round coupling b section along sleeve lining axial motion, by reed stress deformation, is converted to pressure and turns round the rotation of coupling a section, drive valve core rotation.
Consider that proportion electro-magnet can only apply unilateral thrust, therefore design spool is full-bridge bilateral symmetry, two groups of proportion electro-magnets and pressure are turned round coupling and are laid respectively at two ends, valve body left and right.Left end pressure turns round coupling a section and spool left end connects firmly, right-hand member pressure is turned round coupling a section and is connected firmly with spool right-hand member, when the energising of left end (right-hand member) proportion electro-magnet, during right-hand member (left end) proportion electro-magnet dead electricity, left end (right-hand member) proportion electro-magnet thrust is by reed stress deformation, be converted to pressure and turn round the rotation of coupling a section, drive left end valve core rotation, simultaneously, turn round coupling a section due to right-hand member (left end) pressure and there is rotational stiffness, right-hand member Spool rotating will be retrained.For this reason, turn round precompression one section of supported spring between coupling b section and valve body in two side pressures, have centralizing spring effect on the one hand, pretensioned spring elastic force will make reed strut on the one hand, and turning round coupling a section to two ends has pre-torsion effect.When the energising of left end (right-hand member) proportion electro-magnet, during right-hand member (left end) proportion electro-magnet dead electricity, left end (right-hand member) proportion electro-magnet thrust will break spool two ends stress balance, left end (right-hand member) is pressed and turns round coupling b section pressurized, left end (right-hand member) pressure turns round coupling a section inverse (suitable) hour hands rotating tendency, make right-hand member (left end) press simultaneously and turn round coupling b section tension, right-hand member (left end) pressure turns round coupling a section also inverse (suitable) hour hands rotating tendency, therefore, now, spool will rotate against (suitable) hour hands.
Sleeve outer wall is a conical surface, by four caging bolts, sleeve two ends are contacted respectively with fixed plate with valve body, when two ends proportion electro-magnet dead electricity, when needing spool machine zero, two ends sleeve can be rotated, make spool be in zero-bit, then move slip snap ring, by stuck for two ends sleeve, complete spool machine zero.
Working principle is see Fig. 4.When system has normal working pressure, after machine zero, as Fig. 4 a, when left end proportion electro-magnet 2 is energized, right-hand member proportion electro-magnet 19 dead electricity, left end pressure turns round coupling b section 32 by electromagnetic push, left end pressure is turned round coupling a section 28 and is rotated counterclockwise trend, one section of supported spring 23 is had owing to turning round precompression between coupling b section 21 and valve body 10 in right-hand member pressure, the reaction of bearing of spring makes right-hand member pressure turn round coupling a section 25 pre torqued trend, left end proportion electro-magnet 2 thrust makes right-hand member pressure turn round coupling b section 21 tension simultaneously, make right-hand member pressure turn round coupling a section 25 to be rotated counterclockwise, therefore, now, spool 11 will rotate counterclockwise, as Fig. 4 b.Spool 11 rotates counterclockwise, make that the pressure hole b on left end shoulder and the area of overlap experiencing passage 9 increase, low pressure hole c and the area of overlap of experiencing passage 9 reduce, left side sensitive cavity d pressure increases, simultaneously, pressure hole f on right-hand member shoulder and the area of overlap experiencing passage 12 reduce, low pressure hole e increases with the area of overlap experiencing passage 12, the right sensitive cavity g pressure reduces, therefore spool 11 will move right.Spool 11 moves right, and drives right-hand member pressure to turn round coupling a section 25 and also moves right, and spool 11 is rotated clockwise.When the displacement that spool 11 moves and right-hand member pressure turn round the displacement of coupling a section 25 identical time, spool goes back to initial position clockwise, and left end proportion electro-magnet 2, spool 11 and right-hand member pressure to turn round the displacement that coupling a section 25 moves right consistent.As Fig. 4 c.In like manner, when left end proportion electro-magnet 2 dead electricity, right-hand member proportion electro-magnet 19 is energized, and spool 11 will to left movement.
Above-mentioned embodiment is used for explaining the present invention, instead of limits the invention, and in the protection domain of spirit of the present invention and claim, any amendment make the present invention and change, all fall into protection scope of the present invention.

Claims (4)

1. a two-way full-bridge 2D electrohydraulic proportional directional valve, comprise valve body and spool, described spool is installed in rotation in valve body, it is characterized in that: described two-way full-bridge 2D electrohydraulic proportional directional valve also comprises left end proportion electro-magnet, right-hand member proportion electro-magnet, left end pressure in order to axial pressure to be converted to moment of torsion turns round coupling and right-hand member pressure turns round coupling, described left end proportion electro-magnet, left end pressure turns round coupling, spool, right-hand member pressure turns round coupling and the coaxial connection of right-hand member proportion electro-magnet, the input end that output shaft and the described left end pressure of described left end proportion electro-magnet turn round coupling contacts, the output terminal that described left end pressure turns round coupling is fixedly connected with described spool left end, the input end that output shaft and the described right-hand member pressure of described right-hand member proportion electro-magnet turn round coupling contacts, and the output terminal that described right-hand member pressure turns round coupling is fixedly connected with described spool right-hand member,
Described left end pressure is turned round coupling and is set with left end sleeve outward, described left end sleeve is connected with left end fixed plate, described left end fixed plate is connected with left end proportion electro-magnet, described right-hand member pressure is turned round coupling and is set with right-hand member sleeve outward, described right-hand member sleeve is connected with right-hand member fixed plate, and described right-hand member fixed plate is connected with right-hand member proportion electro-magnet; The left end of described spool, left end sleeve, left end fixed plate form left end sensitive cavity, the right-hand member of spool, right-hand member sleeve and right-hand member fixed plate form right-hand member sensitive cavity, shoulder surface, spool two ends in the sensitive cavity of two ends all has a pair axisymmetric pressure hole and a pair axisymmetric low pressure hole, the internal surface of the valve body outside the sensitive cavity of two ends is provided with a pair and axisymmetricly experiences passage, described one end experiencing passage is communicated with described sensitive cavity, and the described the other end experiencing passage covers the region between adjacent pressure hole and low pressure hole.
2. two-way full-bridge 2D electrohydraulic proportional directional valve as claimed in claim 1, it is characterized in that: described left end pressure is turned round coupling and comprised left end pressure and turn round coupling a section, left end support spring, left end reed, left end pressure turns round coupling b section, left end steel ball and left end slip snap ring, described left end pressure is turned round coupling b section and is contacted with left end proportion electro-magnet output shaft, described left end reed one end and left end pressure are turned round coupling b section and are connected, the described left end reed the other end and left end pressure are turned round coupling a section and are connected, described left end pressure turns round coupling b section by left end steel ball and left end sleeve connection, left end bush outer sleeve dress left end slip snap ring, described left end sleeve lining is provided with the hemisphere type groove turning round the axial motion of coupling b section for left end pressure, left end pressure turns round precompression one section of supported spring between coupling b section and valve body.
3. two-way full-bridge 2D electrohydraulic proportional directional valve as claimed in claim 1, it is characterized in that: described right-hand member pressure is turned round coupling and comprised right-hand member pressure and turn round coupling a section, right-hand member supported spring, right-hand member reed, right-hand member pressure turns round coupling b section, right-hand member steel ball and right-hand member slip snap ring, described right-hand member pressure is turned round coupling b section and is contacted with right-hand member proportion electro-magnet output shaft, described right-hand member reed one end and right-hand member pressure are turned round coupling b section and are connected, the described right-hand member reed the other end and right-hand member pressure are turned round coupling a section and are connected, described right-hand member pressure turns round coupling b section by right-hand member steel ball and right-hand member sleeve connection, right-hand member bush outer sleeve dress right-hand member slip snap ring, described right-hand member sleeve lining is provided with the hemisphere type groove turning round the axial motion of coupling b section for right-hand member pressure, right-hand member pressure turns round precompression one section of supported spring between coupling b section and valve body.
4. the two-way full-bridge 2D electrohydraulic proportional directional valve as described in one of claims 1 to 3, it is characterized in that: plug is installed at the two ends of described spool, described left end sleeve one end is connected with the radial seal of described left end fixed plate by O RunddichtringO, and the described left end sleeve the other end is connected with described valve body one end radial seal by O RunddichtringO; Described right-hand member sleeve one end is connected with the radial seal of described right-hand member fixed plate by O RunddichtringO, and the described right-hand member sleeve the other end is connected with described valve body one end radial seal by O RunddichtringO.
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CN105526205A (en) * 2016-01-25 2016-04-27 浙江大学城市学院 Integral pressure-torsion coupling type 2D electro-hydraulic proportional reversing valve

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