CN101846109A - Two-way flow rate continuous control valve - Google Patents
Two-way flow rate continuous control valve Download PDFInfo
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- CN101846109A CN101846109A CN 201010162288 CN201010162288A CN101846109A CN 101846109 A CN101846109 A CN 101846109A CN 201010162288 CN201010162288 CN 201010162288 CN 201010162288 A CN201010162288 A CN 201010162288A CN 101846109 A CN101846109 A CN 101846109A
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Abstract
The invention relates to a two-way flow rate continuous control valve, which is characterized in that a hydraulic pump inlet is communicated with a control cavity through a first flow channel L1 on a main valve cover, wherein the control cavity is formed by the upper end surface of a main valve core, a main valve sleeve and the main valve cover; an oil outlet of the hydraulic pump is communicated with an oil inlet of a two-position two-way valve through a second flow channel L2; an oil outlet of the two-position two-way valve is communicated with an oil outlet of a main valve through a third flow channel L3; the main valve core is provided with a throttling groove and a fourth flow channel L4; and one end of the throttling groove is communicated with an oil inlet of the main valve core through the IV flow channel L4, and the other end thereof is communicated with the control cavity through a throttling edge on the main valve sleeve. The two-way flow rate continuous control valve adopts the hydraulic pump as a pilot stage for controlling the main valve, controls the flow rate of oil discharged by an upper cavity of the main valve without being influenced by load change by changing the discharge capacity or the rotating speed of the hydraulic pump, realizes the control to the flow rate of the main valve, has the advantages of automatic compensation of load pressure change, no need of position detection of the main valve core and no need of external pilot for oil supply and simplifies the structure of the valve and control complexity.
Description
Technical field
The present invention relates to the electric-hydraulic proportion flow control valve in the hydraulic control component, particularly a kind of to entering the flow of hydraulic actuator, can not be subjected to induced pressure to change the flow control valve of continuous control.
Background technique
Two logical proportional flow control valves are flow control elements important in the electrohydraulic control system, in the application that requires big flow, often adopt guide's control type structure.Guide's control ratio Flow valve of the prior art, the control principle that adopts has following three kinds, 1. adopt the pressure reduction at differential pressure compensator Comparative Examples throttle valve oil inlet and outlet two ends to control, guarantee it not to be subjected to the influence that induced pressure changes substantially and keep constant, thereby the opening continuous control flow by the control ratio throttle valve.2. adopt the flow of flow transducer closed loop control, flow typically arranged----displacement force feedback and flow--displacement electricity feedback valve by valve.3. adopts pressure sensor by the pressure reduction at real-time detection valve port two ends, is proofreaied and correct control flow rate by the flow rate calculation formula to the opening amount to valve.These methods are all not enough to some extent, and it is low that first method is subjected to steady-state fluid force to influence control accuracy, and increased the restriction loss of valve.Second method complex structure manufacture difficulty is big, and control characteristic is subjected to the influence of flow transducer dynamic characteristic, poor stability.The third method cost height, pressure transducer easily break down, poor reliability.And after stimulating the menstrual flow of valve reached certain value, differential pressure compensator and flow transducer structurally became and can not realize, the indirect control flow rate of opening that prior art can only control valve can not be eliminated the influence of load variations.
In addition, existing technology all adopts proportion electro-magnet as electromechanical transducer, with the mechanical closed loop of guide proportion throttle valve by valve inside, or adopt displacement transducer to constitute the opening of electric closed loop control valve, what pilot valve adopted all is the throttling control mode, fluid is merely able to flow to low-pressure port from high pressure port, and along with the increase that the raising and the valve of valve actuation attitude response stimulates the menstrual flow, the energy loss of guide's part also increases.The thinking that the present invention proposes is, the principle that is directly proportional with pilot flow according to the flow of Valvistor valve by main valve, on the basis of original Valvistor main valve, adopt oil hydraulic pump to replace traditional pilot valve, by changing the pump delivery or the rotating speed of pump control pilot flow, because the flow of oil hydraulic pump and load variations are irrelevant, thereby obtain not to be subjected to the characteristic of load effect continuous control by the valve flow.Because oil hydraulic pump control only is pilot flow,, can not increase the volume of valve so the hydraulic pressure pump delivery that adopts is also very little.Oil hydraulic pump all is a normal structure, and manufacturing industry is very easy to, and can not increase the manufacture difficulty of valve.
Summary of the invention
The purpose of this invention is to provide a kind of two-way flow rate continuous control valve, adopt the electric-hydraulic proportion flow control element, the relation that the flow of the existing Valvistor valve main valve of utilization is directly proportional with pilot flow, be not subjected to load effect ground continuous control pilot flow by oil hydraulic pump, by the working principle of similar electron transistor, the control of linear amplification ground is by the flow of main valve.
Based on above-mentioned purpose, the measure that the present invention taked comprises main valve plug, main valve housing, main spool spring, main valve body, main valve lid, it is characterized in that further having set up guide's oil hydraulic pump, motor, two position two-way valve, coupling, motor speed controller replace traditional servo or proportional throttle valve as pilot stage; Motor drives guide's oil hydraulic pump through coupling, the rotating speed and the sense of rotation of motor speed controller control motor, the I runner L that the filler opening of guide's oil hydraulic pump covers by main valve
1Control chamber A with main valve plug upper-end surface and main valve housing and the formation of main valve lid
xBe communicated with, the oil outlet of guide's oil hydraulic pump is through II runner L
2Be communicated with the filler opening of two position two-way valve, the oil outlet of two position two-way valve is through III runner L
3Oil outlet A with main valve
BBe communicated with, two position two-way valve both can be that electrically-controlled valve can be a hydraulic control valve also, offered throttling groove C and IV runner L on the main valve plug
4, the end of throttling groove C is through IV runner L
4Filler opening A with main valve plug
ABe communicated with, the other end of throttling groove C through the throttling limit D on the main valve housing after with control chamber A
xBe communicated with.
The present invention's a kind of two logical cartridge-type flow rate continuous control valves, it is characterized in that guide's oil hydraulic pump can be the quantitative hydraulic pump of any structural type, it also can be the change displacement hydraulic pump of the electronics proportional control of any form, their sense of rotation can be unidirectional, also can be two-way, become displacement hydraulic pump if adopt, on oil hydraulic pump, answer the electronic control unit (proportional amplifier) of integrated control pump discharge capacity.
The present invention's a kind of two logical cartridge-type flow rate continuous control valves, it is characterized in that guide's oil hydraulic pump can be an independent oil hydraulic pump, the also oil hydraulic pump group that can form by two above oil hydraulic pumps, their discharge capacity can equate, also can be unequal, and each oil hydraulic pump all has drive motor separately.
The present invention's a kind of two logical cartridge-type flow rate continuous control valves, it is characterized in that driving guide's hydraulic pressure pump motor can be common AC asynchronous motor, it can be alternating current servomotor, or switched reluctance motor, also can be the motor of any structural types such as DC servo-motor.
The substantive distinguishing features that the present invention gives prominence to mainly is: need not differential pressure compensator, flow transducer and complicated electronic calibration computing, just can not be subjected to continuous control that load variations influences flow by main valve, has the little advantage of the pressure loss simple in structure, adopt oil hydraulic pump to replace proportional throttle valve as pilot stage, the guide oil flow also can directly offer load, can reduce the power loss of pilot stage, adopt oil hydraulic pump to replace proportional throttle valve, can also widen the working pressure scope of valve as pilot stage.
Description of drawings:
Fig. 1 guide's oil hydraulic pump adopts quantitative hydraulic pump, by changing the two-way flow rate continuous control valve structural representation of rotating speed of motor control guide oil flow.
Fig. 2 guide's oil hydraulic pump adopts the two-way flow rate continuous control valve structural representation of the change discharge capacity principle control guide oil flow of electronics proportional control.
Among the figure: 1: main valve plug, 2; Main valve housing, 3: main spool spring, 4: main valve body, 5: the main valve lid, 6: guide's oil hydraulic pump, 7: motor, 8: two position two-way valve, 9: coupling, 10: motor speed controller,
Among the figure: A
A: main valve oil inlet, A
B: main valve oil outlet, A
x: control chamber, L
1: I runner, L
2: II runner, L
3: III runner, L
4: IV runner, C: throttling groove, D: throttling limit.
Embodiment
Below in conjunction with drawings and embodiments the principle and the structure of invention are made and being further described, the present invention can be understood and implement to this professional those of ordinary skill after having read specific embodiment.Present embodiment is a detailed description of the invention, the present invention is not made any restriction.
Embodiment one
First kind of embodiment of the present invention as shown in Figure 1.The two-way flow rate continuous control valve of invention includes main valve plug 1, main valve housing 2, and main spool spring 3, main valve body 4, main valve lid 5, guide's oil hydraulic pump 6, motor 7, two position two-way valve 8, coupling 9, motor speed controller 10 totally 10 parts are formed.Guide's oil hydraulic pump 6 is selected the slant plate type axial piston quantitative hydraulic pump of two-way rotation for use, motor 7 adopts the AC servo motor of permanent-magnet synchronous type, motor 7 drives guide's oil hydraulic pump 6 through coupling 9, motor speed controller 10 adopts the frequency variator of vector control, the rotating speed and the sense of rotation of control motor 7, the filler opening of guide's oil hydraulic pump 6 is by the I runner L on the main valve lid 5
1Control chamber A with main valve plug 1 upper-end surface and main valve housing 2 and 5 formation of main valve lid
xBe communicated with, the oil outlet of guide's oil hydraulic pump 6 is through II runner L
2Be communicated with the filler opening of two position two-way valve 8, the oil outlet of two position two-way valve 8 is through III runner L
3Oil outlet A with main valve
BBe communicated with, two position two-way valve 8 is selected the electrically-controlled valve mode for use, and when outage, two position two-way valve 8 is in closed condition, with II runner L
2With III runner L
3Cut off, after the energising, two position two-way valve 8 is with II runner L
2With III runner L
3Be communicated with, symmetry offers two throttling groove C, IV runner L on the spool 1
4Processing is in the neutral position of main valve plug, and the end of throttling groove C is through IV runner L
4Filler opening A with main valve plug 1
ABe communicated with, the other end of throttling groove C through the throttling limit D on the main valve housing after with control chamber A
xBe communicated with.
The working procedure of valve is, when two position two-way valve 8 is in off-position, and II runner L
2With III runner L
3Cut off; at this moment motor 7 also should be in outage state; living the pressure of spool epicoele (control chamber) and the pressure of main valve plug cavity of resorption (main valve import) equates; under the effect of area difference; main valve plug upper end area equals the area sum in main valve plug lower end area and outlet port; main valve plug is in lowest positions, and valve port is closed, and does not have the flow can be from the import A of valve
AThe outlet A of flow valves
BDuring work, give two position two-way valve 8 energisings, make II runner L
2With III runner L
3Be communicated with, further by outside computer or signal generator, tach signal be input to motor speed controller 10, the rotating speed of controlling guide's oil hydraulic pumps by motor speed controller 10 changes continuously, and promptly may command is from main valve epicoele A
xThe fluid flow that flows out, the characteristic that is directly proportional with the pilot valve flow according to Valvistor valve main valve flow just can not be subjected to the flow of load effect ground continuous control by main valve by the flow that changes guide's oil hydraulic pump again.
Embodiment two
Second kind of embodiment of the present invention as shown in Figure 2.Two logical cartridge-type flow rate continuous control valves of invention include main valve plug 1, main valve housing 2, and main spool spring 3, main valve body 4, main valve lid 5, guide's oil hydraulic pump 6, motor 7, two position two-way valve 8, coupling 9, totally 9 parts are formed.Guide's oil hydraulic pump 6 selects for use the slant plate type axial piston of electronics proportional control to become displacement hydraulic pump, be integrated with the electronic control unit (proportional amplifier) of control pump discharge capacity on this oil hydraulic pump, motor 7 adopts common AC induction motor, working procedure, the rotating speed rotating speed of motor 7 does not change, motor 7 drives guide's oil hydraulic pump 6 through coupling 9, and the filler opening of guide's oil hydraulic pump 6 is by the I runner L on the main valve lid 5
1Control chamber A with main valve plug 1 upper-end surface and main valve housing 2 and 5 formation of main valve lid
xBe communicated with, the oil outlet of guide's oil hydraulic pump 6 is through II runner L
2Be communicated with the filler opening of two position two-way valve 8, the oil outlet of two position two-way valve 8 is through III runner L
3Oil outlet A with main valve
BBe communicated with, two position two-way valve 8 is selected the electrically-controlled valve mode for use, and when outage, two position two-way valve 8 is in closed condition, with II runner L
2With III runner L
3Cut off, after the energising, two position two-way valve 8 is with II runner L
2With III runner L
3Be communicated with, symmetry offers two throttling groove C, IV runner L on the spool 1
4Processing is in the neutral position of main valve plug, and the end of throttling groove C is through IV runner L
4Filler opening A with main valve plug 1
ABe communicated with, the other end of throttling groove C through the throttling limit D on the main valve housing after with control chamber A
xBe communicated with.
Control procedure and embodiment's 1 difference is, oil hydraulic pump 6 adopts the change displacement hydraulic pump of electronics proportional control, the motor of selecting for use 7 is common AC induction motor, the working procedure rotating speed of motor does not change, computer or signal generator by the outside, the setting signal of pump displacement is input to the electronic control unit of guide's oil hydraulic pump, and the output flow of control guide oil hydraulic pump changes continuously, by changing the control of guide's hydraulic pressure pump delivery from main valve epicoele A
xThe fluid flow that flows out, the characteristic that is directly proportional with the pilot valve flow according to Valvistor valve main valve flow just can not be subjected to the flow of load effect ground continuous control by main valve by the flow that changes guide's oil hydraulic pump again.
Claims (4)
1. two-way flow rate continuous control valve, include main valve plug (1), main valve housing (2), main spool spring (3), main valve body (4), main valve lid (5), it is characterized in that further having set up guide's oil hydraulic pump (6), motor (7), two position two-way valve (8), coupling (9), motor speed controller (10) replace traditional servo or proportional throttle valve as pilot stage; Motor (7) drives guide's oil hydraulic pump (6) through coupling (9), the rotating speed and the sense of rotation of motor speed controller (10) control motor (7), and the filler opening of guide's oil hydraulic pump (6) is by the I runner L on the main valve lid (5)
1Control chamber (A with main valve plug (1) upper-end surface and main valve housing (2) and main valve lid (5) formation
x) be communicated with, the oil outlet of guide's oil hydraulic pump (6) is through II runner (L
2) be communicated with the filler opening of two position two-way valve (8), the oil outlet of two position two-way valve (8) is through III runner (L
3) with the oil outlet (A of main valve
B) be communicated with, two position two-way valve (8) both can be that electrically-controlled valve also can be a hydraulic control valve, offered throttling groove (C) and IV runner (L on the main valve plug (1)
4), an end of throttling groove (C) is through IV runner (L
4) with the filler opening (A of main valve plug (1)
A) be communicated with, the other end of throttling groove (C) is through back, the throttling limit (D) on the main valve housing and control chamber (A
x) be communicated with.
2. as claims 1 described two-way flow rate continuous control valve, it is characterized in that guide's oil hydraulic pump (6) is the change displacement hydraulic pump of quantitative hydraulic pump or electronics proportional control, its sense of rotation is unidirectional or two-way.
3. as claims 1 described two-way flow rate continuous control valve, it is characterized in that guide's oil hydraulic pump (6) is the oil hydraulic pump group that the oil hydraulic pump more than or two constitutes, its discharge capacity is equal or does not wait.
4. as claims 1 described two-way flow rate continuous control valve, it is characterized in that motor (7) is AC asynchronous motor, alternating current servomotor, switched reluctance motor or DC servo-motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101622884A CN101846109B (en) | 2010-04-30 | 2010-04-30 | Two-way flow rate continuous control valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101622884A CN101846109B (en) | 2010-04-30 | 2010-04-30 | Two-way flow rate continuous control valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101846109A true CN101846109A (en) | 2010-09-29 |
| CN101846109B CN101846109B (en) | 2012-08-29 |
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ID=42770862
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010101622884A Expired - Fee Related CN101846109B (en) | 2010-04-30 | 2010-04-30 | Two-way flow rate continuous control valve |
Country Status (1)
| Country | Link |
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| CN (1) | CN101846109B (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102155449A (en) * | 2011-03-31 | 2011-08-17 | 太原理工大学 | Digitally controlled leading type proportional flow valve |
| CN103343758A (en) * | 2013-07-09 | 2013-10-09 | 常德中联重科液压有限公司 | Hydraulic control type through-flow control valve bank, excavator movable arm hydraulic control system and excavator |
| CN104582910A (en) * | 2012-08-27 | 2015-04-29 | 埃克苏仿生公司 | Hydraulic actuator system |
| CN106555785A (en) * | 2016-10-11 | 2017-04-05 | 太原理工大学 | Type pilot proportion directional flow rate continuous control valve |
| CN110714839A (en) * | 2019-09-23 | 2020-01-21 | 中国科学院工程热物理研究所 | Multi-oil-path aeroengine parking control system |
| CN111092515A (en) * | 2019-12-20 | 2020-05-01 | 太原理工大学 | Integrated electromechanical-hydraulic driving and energy storage integrated actuating device |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106246629B (en) * | 2016-10-11 | 2017-10-13 | 太原理工大学 | External control type guide proportion directional valve |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4964680A (en) * | 1988-10-07 | 1990-10-23 | Sumitomo Electric Industries, Ltd. | Flow control valve for antilock brake control device |
| CN1053111A (en) * | 1989-12-31 | 1991-07-17 | 太原工业大学 | Combined overflowing and speed-changing valve by hydroelectric proportion |
| GB2244769B (en) * | 1990-05-25 | 1994-07-20 | Teves Gmbh Alfred | Brake pressure control arrangement |
| EP1415892A1 (en) * | 2002-10-29 | 2004-05-06 | Bayerische Motoren Werke Aktiengesellschaft | Hydraulic system for a servo steering of a motor vehicle |
-
2010
- 2010-04-30 CN CN2010101622884A patent/CN101846109B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4964680A (en) * | 1988-10-07 | 1990-10-23 | Sumitomo Electric Industries, Ltd. | Flow control valve for antilock brake control device |
| CN1053111A (en) * | 1989-12-31 | 1991-07-17 | 太原工业大学 | Combined overflowing and speed-changing valve by hydroelectric proportion |
| GB2244769B (en) * | 1990-05-25 | 1994-07-20 | Teves Gmbh Alfred | Brake pressure control arrangement |
| EP1415892A1 (en) * | 2002-10-29 | 2004-05-06 | Bayerische Motoren Werke Aktiengesellschaft | Hydraulic system for a servo steering of a motor vehicle |
Non-Patent Citations (1)
| Title |
|---|
| 《工程机械》 19950630 权龙等 液压晶体管Valvistor_可连续比例控制的新型插装阀 30-33 , 第6期 2 * |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102155449A (en) * | 2011-03-31 | 2011-08-17 | 太原理工大学 | Digitally controlled leading type proportional flow valve |
| CN102155449B (en) * | 2011-03-31 | 2015-11-25 | 太原理工大学 | Numerically controlled leading type proportional flow valve |
| CN104582910A (en) * | 2012-08-27 | 2015-04-29 | 埃克苏仿生公司 | Hydraulic actuator system |
| CN103343758A (en) * | 2013-07-09 | 2013-10-09 | 常德中联重科液压有限公司 | Hydraulic control type through-flow control valve bank, excavator movable arm hydraulic control system and excavator |
| CN103343758B (en) * | 2013-07-09 | 2016-02-03 | 常德中联重科液压有限公司 | Hydraulic control type through-flow control valve bank, excavator movable arm hydraulic control system and excavator |
| CN106555785A (en) * | 2016-10-11 | 2017-04-05 | 太原理工大学 | Type pilot proportion directional flow rate continuous control valve |
| CN110714839A (en) * | 2019-09-23 | 2020-01-21 | 中国科学院工程热物理研究所 | Multi-oil-path aeroengine parking control system |
| CN110714839B (en) * | 2019-09-23 | 2020-06-02 | 中国科学院工程热物理研究所 | Multi-oil-path aeroengine parking control system |
| CN111092515A (en) * | 2019-12-20 | 2020-05-01 | 太原理工大学 | Integrated electromechanical-hydraulic driving and energy storage integrated actuating device |
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| Publication number | Publication date |
|---|---|
| CN101846109B (en) | 2012-08-29 |
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Effective date of registration: 20200608 Address after: 035400 Shanxi city of Xinzhou province Dingxiang County Zhuang Industrial Zone Patentee after: Dingxiang Huangxing machining Co.,Ltd. Address before: 030024 West Street, Taiyuan, Shanxi, No. 79, No. Patentee before: Taiyuan University of Technology |
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