CN104613034A - Electro-hydraulic servo valve with safety protection devices - Google Patents
Electro-hydraulic servo valve with safety protection devices Download PDFInfo
- Publication number
- CN104613034A CN104613034A CN201410712032.4A CN201410712032A CN104613034A CN 104613034 A CN104613034 A CN 104613034A CN 201410712032 A CN201410712032 A CN 201410712032A CN 104613034 A CN104613034 A CN 104613034A
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- Prior art keywords
- armature
- baffle plate
- electro
- hydraulic servo
- safety protection
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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
-
- 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
- F15B20/00—Safety arrangements for fluid actuator systems; Applications of safety devices in fluid actuator systems; Emergency measures for fluid actuator systems
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Servomotors (AREA)
- Magnetically Actuated Valves (AREA)
Abstract
The invention belongs to the aviation hydraulic field and relates to an electro-hydraulic servo valve with safety protection devices. The electro-hydraulic servo valve is mainly applied to a hydraulic servo driving system and specifically comprises an armature, the protection devices, an upper magnetizer, a lower magnetizer, a baffle, nozzles and a feedback rod; the baffle is pressed on the armature in a combined mode, and the protection devices are installed on the upper magnetizer. The two protection devices are installed on the upper magnetizer of the electro-hydraulic servo valve, electro-hydraulic servo valve performance changes caused by the fact that the armature impacts the upper magnetizer and the lower magnetizer and the baffle impacts the nozzles are effectively avoided when the electro-hydraulic servo valve is impacted by an accidental large-amplitude signal, and therefore work reliability of the electro-hydraulic servo valve is improved. Meanwhile, the electro-hydraulic servo valve can be conveniently adapted to different work air gaps by adjusting the lengths of the parts, stretching out of the upper magnetizer, of the protection devices. In addition, the protection devices are made of nonmagnetic materials, and the protection travel is located in a non-work travel area, so that the safety protection device can be added to existing electro-hydraulic servo valves on the basis of not influencing performance of the existing electro-hydraulic servo valves.
Description
Technical field
The invention belongs to aerial hydraulic field, relate to a kind of electrohydraulic control with safety protection device, be mainly used in Hydrauservo System.
Background technique
Electrohydraulic control torque motor air gap is generally at about 0.25mm ~ 0.5mm, spacing between nozzle flapper is generally at about 0.03mm ~ 0.05mm, when electrohydraulic control normally works, the effective linear course of the reality of its armature in torque motor air gap is about 0.08mm ~ 0.16mm, armature can not clash into the magnetic materials such as magnet case, and baffle plate also can not clash into the precision parts such as nozzle.But when system startup is carried out step signal self-inspection or be mixed into amplitude oscillator signal in system control signal, armature may clash into the soft magnetic materials such as magnet case, and baffle plate also can clash into the such precision parts of nozzle.Therefore, the electrohydraulic servo valve guard sometimes under decomposition dismounting sees obvious striking mark, armature, upper magnet case and lower magnetic conduction volume boots also can see slight striking mark.When the nozzle flapper of swiftly flowing fluid after clashing into, liquid stream fluidised form can change; Subjected to the magnetic materials such as the upper and lower magnet case of shock, its inner molecular structure can change, and magnetic property can change equally, so the performance of whole electrohydraulic control also can change.
At present; conventional electrohydraulic control is generally two-stage electrohydraulic control; its safety protection effect generally concentrates on second level power guiding valve level, and by the overload stroke of limiting stopper restriction spool, it ensures that electrohydraulic control can not export excessive flow, thus ensure security of system.Generally little safety relating to the electrohydraulic control first order.
Summary of the invention
Object of the present invention: design a kind of electrohydraulic control with safety protection device.
Technological scheme of the present invention: a kind of electrohydraulic control with safety protection device, comprises protective gear [1], upper magnet case [2], armature [3], lower magnet case [4], baffle plate [5], nozzle [6], end cap [7], limiting stopper [8], spool [9], valve pocket [10], valve body [11], feedback rod [12], fixed orifice [14], feedback rod [15], coil [16], permanent magnet [17].Valve pocket [10] is placed in valve body [11]; Spool [9] is placed in valve pocket [10]; Baffle plate [5] is pressed together on armature [3]; Feedback rod [9] is pressed together on baffle plate [5]; Protective gear [1] is arranged on magnet case [2]; when armature [3] yaw displacement exceeds its specified effective working stroke; protective gear [1] is for limiting the Long Distances excessively of armature [3]; simultaneously; because baffle plate [5] and armature [3] press together, what also limit baffle plate [5] crosses Long Distances.
2, a kind of electrohydraulic control with safety protection device as claimed in claim 1, is characterized in that: described limit stoper is arranged on upper magnet case [2] by screw thread for protection screw [1], protection screw [1].
3, a kind of electrohydraulic control with safety protection device as claimed in claim 1, is characterized in that: described protective gear is position limit pin.
4, a kind of electrohydraulic control with safety protection device according to claim 2, is characterized in that: carry out rubber seal by low-intensity screw thread fastening glue to protective gear [1].
5, a kind of electrohydraulic control with safety protection device according to claim 3, is characterized in that: described position limit pin is pressed together on upper magnet case [2] by interference.
6, a kind of electrohydraulic control with safety protection device according to any one of claim 1-5, is characterized in that: described protective gear is made up of nonmagnetic substance.
Beneficial effect of the present invention: the present invention passes through on upper magnet case by two protective gears installed that are threaded; effectively avoid electrohydraulic control when being subject to unexpected amplitude signal and impacting; armature clashes into above magnet case and lower magnet case, baffle plate and clashes into the change of the electro-hydraulic servo valve performance that nozzle causes, thus improves the functional reliability of electrohydraulic control.Meanwhile, the length by regulating protective gear to stretch out upper magnetic conduction volume boots can adapt to the electrohydraulic control of different operating air gap easily.Further, protective gear adopts nonmagnetic substance to form, and protection stroke is in inoperative lift area, so existing electrohydraulic control is not affecting on the basis of its performance, all can increase this safety protection device.
Accompanying drawing illustrates:
Fig. 1 is structural representation of the present invention.
In accompanying drawing, 1 is protective gear, and 2 is upper magnet case, and 3 is armature; 4 is lower magnet case, and 5 is baffle plate, and 6 is nozzle; 7 is end cap, and 8 is limiting stopper, and 9 is spool; 10 is valve pocket, and 11 is valve body, and 12 is feedback rod; 13 is oil filter, and 14 is fixed orifice, and 15 is bourdon tube; 16 coils, 17 is permanent magnet, and 18 is upper cover.
Embodiment
Below in conjunction with Figure of description and embodiment, the present invention is described in further detail.Refer to Figure of description 1.
A kind of electrohydraulic control with safety protection device; comprise protective gear 1, upper magnet case 2, armature 3, lower magnet case 4, baffle plate 5, nozzle 6, end cap 7, limiting stopper 8, spool 9, valve pocket 10, valve body 11, feedback rod 12, oil filter 13, fixed orifice 14, bourdon tube 15, coil 16, permanent magnet 17.Valve pocket 10 is placed in valve body 11; Spool 9 is placed in valve pocket 10; Baffle plate 5 is pressed together on armature 3; Protective gear 1 is arranged on magnet case 2, and carries out rubber seal by screw thread fastening glue.
Be provided with torque motor in described upper cover, this torque motor comprises magnet case 2, lower magnet case 3, permanent magnet 17, armature 3, bourdon tube 13, baffle plate 5 and protective gear 1.A cavity is formed, in the cavity of permanent magnet 17 between upper magnet case 2 and lower magnet case 4 between upper magnet case 2 and lower magnet case 4.One end of armature 3 is through the through hole on permanent magnet 17, and armature 3 is provided with coil 16, and bourdon tube 15 is connected with armature 3, and one end of baffle plate 5 is connected with armature 3, and the other end of baffle plate 5 passes from the hole of bourdon tube 15.When coil 16 no current passes through, torque motor non-moment exports, and baffle plate 5 is in two nozzle neutral positions.When current input signal is by coil 16, armature 3 is magnetized, if the electric current passed into makes the left end of armature 3 be N pole, right-hand member is S pole, then according to two like magnetic poles repel each other, the principle that there is a natural attraction between the sexes, armature 3 deflects counterclockwise.Bourdon tube 15 bending deflection, produces corresponding countertorque, stops after causing armature 2 to turn over several angle.Electric current is larger, and the angle that armature 3 and baffle plate 5 deflect is larger, and both are proportional.Like this, torque motor is just converted to moment output the electrical signal of input.
When input current is well beyond specified input current, protective gear 1 limits the deflection angle that armature 3 exceeds its nominal operation stroke, also limit the deflection angle that baffle plate 5 exceeds its nominal operation stroke simultaneously, thus plays the effect of safety protection.
The nozzle 6 being positioned at baffle plate 5 both sides is provided with in described housing, a spring sheet 12 with bulb is connected in the lower end of baffle plate 5, be provided with the spool 9 being positioned at bulb both sides in valve body, described spool 9 is slidably fitted in the hole of the Kong Zhongtong be arranged on the valve pocket 10 of valve body.Baffle plate 5, nozzle 6, fixed orifice 14 form a preamplifier stage jointly, and pressure liquid flows to spool left and right two ends oil pocket and two nozzle chambers through oil purifier and two fixed orifices, and sprayed by nozzle 6, the middle part oil pocket through spool 9 flows back to fuel tank.During torque motor non-output signal, baffle plate 5 is motionless, and left and right two cavity pressure is equal, and spool 9 is also motionless.If torque motor has signal to export, i.e. baffle plate deflection, makes gap between two nozzles and baffle plate not, then not etc., pressure oil does not promote valve core and moves the pressure causing spool two ends.
In addition, the feedback rod 12 of spool 9 and baffle plate 5 bottom forms a power-amplifier stage.When preamplifier stage has pressure difference signal to export, spool 9 moves, while spool 9 movement, the bulb of feedback rod 12 lower end is also in company with mobile, band moving armature 3 and bourdon tube 15 produce elastic reaction, stop spool to continue mobile, baffle plate 5 is out of shape and the side-play amount making it between two nozzles reduction on the other hand, thus achieves feedback.When on spool 9 hydraulic action and bourdon tube 15 elastic reaction balance time, spool just remains in this aperture and no longer moves.
Embodiment 1
A kind of electrohydraulic control with safety protection device; comprise protection screw 1, upper magnet case 2, armature 3, lower magnet case 4, baffle plate 5, nozzle 6, end cap 7, limiting stopper 8, spool 9, valve pocket 10, valve body 11, feedback rod 12, oil filter 13, fixed orifice 14, bourdon tube 15, coil 16, permanent magnet 17.Valve pocket 10 is placed in valve body 11; Spool 9 is placed in valve pocket 10; Baffle plate 5 is pressed together on armature 3; Protection screw 1 is arranged on magnet case 2, and carries out rubber seal by screw thread fastening glue.
Be provided with torque motor in described upper cover, this torque motor comprises magnet case 2, lower magnet case 3, permanent magnet 17, armature 3, bourdon tube 13, baffle plate 5 and protection screw 1.A cavity is formed, in the cavity of permanent magnet 17 between upper magnet case 2 and lower magnet case 4 between upper magnet case 2 and lower magnet case 4.One end of armature 3 is through the through hole on permanent magnet 17, and armature 3 is provided with coil 16, and bourdon tube 15 is connected with armature 3, and one end of baffle plate 5 is connected with armature 3, and the other end of baffle plate 5 passes from the hole of bourdon tube 15.When coil 16 no current passes through, torque motor non-moment exports, and baffle plate 5 is in two nozzle neutral positions.When current input signal is by coil 16, armature 3 is magnetized, if the electric current passed into makes the left end of armature 3 be N pole, right-hand member is S pole, then according to two like magnetic poles repel each other, the principle that there is a natural attraction between the sexes, armature 3 deflects counterclockwise.Bourdon tube 15 bending deflection, produces corresponding countertorque, stops after causing armature 2 to turn over several angle.Electric current is larger, and the angle that armature 3 and baffle plate 5 deflect is larger, and both are proportional.Like this, torque motor is just converted to moment output the electrical signal of input.
When input current is well beyond specified input current, protection screw 1 limits the deflection angle that armature 3 exceeds its nominal operation stroke, also limit the deflection angle that baffle plate 5 exceeds its nominal operation stroke simultaneously, thus plays the effect of safety protection.
The nozzle 6 being positioned at baffle plate 5 both sides is provided with in described housing, a spring sheet 12 with bulb is connected in the lower end of baffle plate 5, be provided with the spool 9 being positioned at bulb both sides in valve body, described spool 9 is slidably fitted in the hole of the Kong Zhongtong be arranged on the valve pocket 10 of valve body.Baffle plate 5, nozzle 6, fixed orifice 14 form a preamplifier stage jointly, and pressure liquid flows to spool left and right two ends oil pocket and two nozzle chambers through oil purifier and two fixed orifices, and sprayed by nozzle 6, the middle part oil pocket through spool 9 flows back to fuel tank.During torque motor non-output signal, baffle plate 5 is motionless, and left and right two cavity pressure is equal, and spool 9 is also motionless.If torque motor has signal to export, i.e. baffle plate deflection, makes gap between two nozzles and baffle plate not, then not etc., pressure oil does not promote valve core and moves the pressure causing spool two ends.
In addition, the feedback rod 12 of spool 9 and baffle plate 5 bottom forms a power-amplifier stage.When preamplifier stage has pressure difference signal to export, spool 9 moves, while spool 9 movement, the bulb of feedback rod 12 lower end is also in company with mobile, band moving armature 3 and bourdon tube 15 produce elastic reaction, stop spool to continue mobile, baffle plate 5 is out of shape and the side-play amount making it between two nozzles reduction on the other hand, thus achieves feedback.When on spool 9 hydraulic action and bourdon tube 15 elastic reaction balance time, spool just remains in this aperture and no longer moves.
Embodiment 2
A kind of electrohydraulic control with safety protection device; comprise position limit pin 1, upper magnet case 2, armature 3, lower magnet case 4, baffle plate 5, nozzle 6, end cap 7, limiting stopper 8, spool 9, valve pocket 10, valve body 11, feedback rod 12, oil filter 13, fixed orifice 14, bourdon tube 15, coil 16, permanent magnet 17.Valve pocket 10 is placed in valve body 11; Spool 9 is placed in valve pocket 10; Baffle plate 5 is pressed together on armature 3; Position limit pin 1 interference is pressed together on magnet case 2.
Be provided with torque motor in described upper cover, this torque motor comprises magnet case 2, lower magnet case 3, permanent magnet 17, armature 3, bourdon tube 13, baffle plate 5 and position limit pin 1.A cavity is formed, in the cavity of permanent magnet 17 between upper magnet case 2 and lower magnet case 4 between upper magnet case 2 and lower magnet case 4.One end of armature 3 is through the through hole on permanent magnet 17, and armature 3 is provided with coil 16, and bourdon tube 15 is connected with armature 3, and one end of baffle plate 5 is connected with armature 3, and the other end of baffle plate 5 passes from the hole of bourdon tube 15.When coil 16 no current passes through, torque motor non-moment exports, and baffle plate 5 is in two nozzle neutral positions.When current input signal is by coil 16, armature 3 is magnetized, if the electric current passed into makes the left end of armature 3 be N pole, right-hand member is S pole, then according to two like magnetic poles repel each other, the principle that there is a natural attraction between the sexes, armature 3 deflects counterclockwise.Bourdon tube 15 bending deflection, produces corresponding countertorque, stops after causing armature 2 to turn over several angle.Electric current is larger, and the angle that armature 3 and baffle plate 5 deflect is larger, and both are proportional.Like this, torque motor is just converted to moment output the electrical signal of input.
When input current is well beyond specified input current, position limit pin 1 limits the deflection angle that armature 3 exceeds its nominal operation stroke, also limit the deflection angle that baffle plate 5 exceeds its nominal operation stroke simultaneously, thus plays the effect of safety protection.
The nozzle 6 being positioned at baffle plate 5 both sides is provided with in described housing, a spring sheet 12 with bulb is connected in the lower end of baffle plate 5, be provided with the spool 9 being positioned at bulb both sides in valve body, described spool 9 is slidably fitted in the hole of the Kong Zhongtong be arranged on the valve pocket 10 of valve body.Baffle plate 5, nozzle 6, fixed orifice 14 form a preamplifier stage jointly, and pressure liquid flows to spool left and right two ends oil pocket and two nozzle chambers through oil purifier and two fixed orifices, and sprayed by nozzle 6, the middle part oil pocket through spool 9 flows back to fuel tank.During torque motor non-output signal, baffle plate 5 is motionless, and left and right two cavity pressure is equal, and spool 9 is also motionless.If torque motor has signal to export, i.e. baffle plate deflection, makes gap between two nozzles and baffle plate not, then not etc., pressure oil does not promote valve core and moves the pressure causing spool two ends.
In addition, the feedback rod 12 of spool 9 and baffle plate 5 bottom forms a power-amplifier stage.When preamplifier stage has pressure difference signal to export, spool 9 moves, while spool 9 movement, the bulb of feedback rod 12 lower end is also in company with mobile, band moving armature 3 and bourdon tube 15 produce elastic reaction, stop spool to continue mobile, baffle plate 5 is out of shape and the side-play amount making it between two nozzles reduction on the other hand, thus achieves feedback.When on spool 9 hydraulic action and bourdon tube 15 elastic reaction balance time, spool just remains in this aperture and no longer moves.
Claims (6)
1. there is an electrohydraulic control for safety protection device, it is characterized in that: comprise protective gear [1], upper magnet case [2], armature [3], lower magnet case [4], baffle plate [5], nozzle [6], end cap [7], limiting stopper [8], spool [9], valve pocket [10], valve body [11], feedback rod [12], fixed orifice [14], feedback rod [15], coil [16], permanent magnet [17].Valve pocket [10] is placed in valve body [11]; Spool [9] is placed in valve pocket [10]; Baffle plate [5] is pressed together on armature [3]; Feedback rod [9] is pressed together on baffle plate [5]; Protective gear [1] is arranged on magnet case [2]; when armature [3] yaw displacement exceeds its specified effective working stroke; protective gear [1] is for limiting the Long Distances excessively of armature [3]; simultaneously; because baffle plate [5] and armature [3] press together, what also limit baffle plate [5] crosses Long Distances.
2. a kind of electrohydraulic control with safety protection device as claimed in claim 1, is characterized in that: described limit stoper is arranged on upper magnet case [2] by screw thread for protection screw [1], protection screw [1].
3. a kind of electrohydraulic control with safety protection device as claimed in claim 1, is characterized in that: described protective gear is position limit pin.
4. a kind of electrohydraulic control with safety protection device according to claim 2, is characterized in that: carry out rubber seal by low-intensity screw thread fastening glue to protective gear [1].
5. a kind of electrohydraulic control with safety protection device according to claim 3, is characterized in that: described position limit pin is pressed together on upper magnet case [2] by interference.
6. a kind of electrohydraulic control with safety protection device according to any one of claim 1-5, is characterized in that: described protective gear is made up of nonmagnetic substance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410712032.4A CN104613034A (en) | 2014-11-28 | 2014-11-28 | Electro-hydraulic servo valve with safety protection devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410712032.4A CN104613034A (en) | 2014-11-28 | 2014-11-28 | Electro-hydraulic servo valve with safety protection devices |
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| Publication Number | Publication Date |
|---|---|
| CN104613034A true CN104613034A (en) | 2015-05-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410712032.4A Pending CN104613034A (en) | 2014-11-28 | 2014-11-28 | Electro-hydraulic servo valve with safety protection devices |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104912861A (en) * | 2015-05-21 | 2015-09-16 | 遵义市节庆机电有限责任公司 | Electro-hydraulic servo valve structure |
| CN105156406A (en) * | 2015-08-27 | 2015-12-16 | 北京精密机电控制设备研究所 | Integrated oil filter assembly for servo valve |
| CN105570225A (en) * | 2016-03-03 | 2016-05-11 | 安徽万荣航天设备有限公司 | Ultra-low-pressure large-flow electro-hydraulic servo valve |
| CN113153849A (en) * | 2021-04-25 | 2021-07-23 | 陈惠波 | Hydraulic servo valve |
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| US3789736A (en) * | 1970-12-11 | 1974-02-05 | Dowty Boulton Paul Ltd | Multiple hydraulic actuator |
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| CN201443643U (en) * | 2008-12-19 | 2010-04-28 | 上海诺玛液压系统有限公司 | Electric feedback type no-valve pocket mechanical failure insurance type electrohydraulic servo valve of jet pipes |
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2014
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104912861A (en) * | 2015-05-21 | 2015-09-16 | 遵义市节庆机电有限责任公司 | Electro-hydraulic servo valve structure |
| CN105156406A (en) * | 2015-08-27 | 2015-12-16 | 北京精密机电控制设备研究所 | Integrated oil filter assembly for servo valve |
| CN105570225A (en) * | 2016-03-03 | 2016-05-11 | 安徽万荣航天设备有限公司 | Ultra-low-pressure large-flow electro-hydraulic servo valve |
| CN113153849A (en) * | 2021-04-25 | 2021-07-23 | 陈惠波 | Hydraulic servo valve |
| CN113153849B (en) * | 2021-04-25 | 2023-09-15 | 沈阳帕维电力技术有限公司 | Hydraulic servo valve |
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