CN104776077B - Load-sensitive multiway valve with micromotion valve element - Google Patents

Load-sensitive multiway valve with micromotion valve element Download PDF

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Publication number
CN104776077B
CN104776077B CN201510062761.4A CN201510062761A CN104776077B CN 104776077 B CN104776077 B CN 104776077B CN 201510062761 A CN201510062761 A CN 201510062761A CN 104776077 B CN104776077 B CN 104776077B
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valve
hole
valve element
fine motion
oil
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CN104776077A (en
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刘金刚
王凯
麻成标
廖金军
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Xiangtan University
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Xiangtan University
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    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15BSYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02Fluid distribution or supply devices characterised by their adaptation to the control of servomotors

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Multiple-Way Valves (AREA)

Abstract

The invention provides a load-sensitive multiway valve with a micromotion valve element. The load-sensitive multiway valve with the micromotion valve element comprises at least one valve body, wherein the valve body is provided with one group or multiple groups of valve blocks and an oil inlet hole; two ends of the valve body are respectively provided with a control end cover and a control piston end cover; each valve block comprises a main valve element hole, a micromotion valve element hole, a compensation valve element hole, an oil inlet path, a multiway valve oil inlet cavity, a plurality of oil outlet holes and oil leakage holes; a main valve element, a micromotion valve element and a compensation valve element are respectively installed in each main valve element hole, each micromotion valve element hole and each compensation valve element hole; each he oil inlet path is communicated with the corresponding oil inlet hole of the valve body and is communicated with a multiway valve oil inlet cavity via the corresponding compensation valve element hole; each multiway valve oil inlet cavities are communicated with the oil outlet holes and the oil leakage holes via the main valve element holes and the micromotion valve element holes. The load-sensitive multiway valve is provided with the micromotion valve elements, so that the load-sensitive multiway valve has the advantages of better multiway valve micromotion performance and convenience in the small-flow regulation of a system, system pressure loss is reduced, and an energy use ratio is improved. According to the load-sensitive multiway valve, the processing of a valve element throttling groove is reduced, and the difficulty of a processing technology is lowered.

Description

A kind of load sensing multi-way valve with fine motion valve element
Technical field
The present invention relates to a kind of banked direction control valves, especially relate to a kind of load sensing multi-way valve with fine motion valve element.
Background technology
Continuous development with modern hydraulic technology and field requirement more harsh is so that engineering machinery field just court Precision, the direction of tranquilization is developed.Speed governing valve element, integrated level are decreased using the hydraulic system of load-sensitive technology Height, and the step-less adjustment of feasible system executive component speed, have widened flow system flow adjustable range, and adjust accurately, process Steadily so that it is widely used in engineering machinery field.
In hydraulic system, often require that the flow rate fine-tuning stage, to realize accurately steadily positioning of system executive component. There is the hydraulic system banked direction control valves of load-sensitive characteristic by valve element amount of movement come accuracy-control system uninterrupted, its fine motion The quality of energy directly affects accuracy and the stationarity of flow system flow regulation.Existing banked direction control valves opens combination usually through in valve element The mode control system discharge characteristic of throttling channel, this method exists clearly disadvantageous:Combination throttling channel increased valve element processing The difficulty of technique, high expensive;Throttling channel makes system pressure loss big, and energy consume is high.
Content of the invention
In order to solve above-mentioned technical problem, the present invention provides the load-sensitive that a kind of structure simply has fine motion valve element many Road valve, the present invention has the advantages that fretting performance is good, control accurately and difficulty of processing is little.
The technical solution used in the present invention is:Including at least one valve body;Valve body is provided with one or more groups of valve blocks and oil-feed Hole;The two ends of described valve body are provided with control end cap and control piston end cap;
Described valve block includes main valve core bore, fine motion spool bore, recuperation valve core bore, oil inlet passage, banked direction control valves oil suction chamber, many Individual oil outlet and multiple oil leak hole;Described main valve core bore, fine motion spool bore and recuperation valve core bore are set in parallel on valve body;Main Spool bore, fine motion spool bore and compensating spool in the hole are separately installed with main valve plug, fine motion valve element and compensating spool;Corresponding to valve body On main valve plug and fine motion valve element, control piston end cap to be provided with main valve plug piston hole and fine motion valve element piston hole, main valve plug is lived Consent and fine motion valve element piston hole tail end pass through pipeline communication, and pipeline is provided with the first control port;The main valve plug control of main valve plug Piston processed is located at main valve plug piston in the hole, and the fine motion valve element of fine motion valve element controls piston to be located in fine motion valve element piston hole;Corresponding Main valve plug on valve body and fine motion valve element, control end lid is provided with main valve plug control hole and fine motion valve element control hole, main valve plug The tail end of control hole and fine motion valve element control hole passes through pipeline communication, and pipeline is provided with the second control port;The end of main valve plug Control in the hole positioned at main valve plug, the end of fine motion valve element is located in fine motion valve element control hole;Oil inlet passage and the fuel feed hole of valve body Connection, oil inlet passage is connected with banked direction control valves oil suction chamber by recuperation valve core bore, and banked direction control valves oil suction chamber passes through main valve core bore and fine motion Spool bore is connected with multiple oil outlets and multiple oil leak hole.
In the above-mentioned load sensing multi-way valve with fine motion valve element, including multiple valve bodies and base plate, described valve body Fuel feed hole is through hole, and described multiple valve bodies and base plate are connected by screw, between adjacent valve body and between valve body and base plate Sealing, base plate is arranged on the face at oil-in place of fuel feed hole on valve body.
In the above-mentioned load sensing multi-way valve with fine motion valve element, corresponding to compensating spool, control end lid is provided with tune Section screw, the spring end in contact of the end of adjusting screw and compensating spool;Recuperation valve core bore is provided with towards control piston end cap end Screw plug.
In the above-mentioned load sensing multi-way valve with fine motion valve element, described valve block, corresponding to the spring of compensating spool Place is provided with spout hole, and spout hole is connected with recuperation valve core bore;Overflow in the hole is provided with overflow valve, corresponding to overflow valve, valve body sets There is overflow valve adjusting screw.
In the above-mentioned load sensing multi-way valve with fine motion valve element, described valve block be provided with two oil outlets and two let out Oilhole, two oil leak hole are arranged respectively close to the two ends of valve body, and two oil outlets are located between two oil leak hole, banked direction control valves oil-feed The both sides in chamber.
Compared with prior art, the invention has the beneficial effects as follows:
Fine motion valve element of the present invention and main valve plug adopt parallel-connection structure, and the working oil path of fine motion valve element and main valve plug, oil-feed Road and oil return line share, and structure is simple;The diameter of the fine motion valve element of the present invention is about 1/3rd of main valve core diameter, in system The micro-positioning regulators stage, by the axial movement of fine motion valve element, to realize the accurate adjustment of flow system flow;In system big flow rank Section, by the collective effect of fine motion valve element and main valve plug, meets flow system flow requirement, the therefore present invention is applied to big flow field Close, meet the scope of flow system flow regulation;The present invention is provided with fine motion valve element so that banked direction control valves fretting performance more preferably, is easy to system Low discharge is adjusted;And reduce system pressure loss, improve energy utilization rate;Compared with existing banked direction control valves, the present invention subtracts Lack the processing of throttling spool groove, reduce the processing technology difficulty of the present invention.
Brief description
Fig. 1 is the top view of the present invention.
Fig. 2 is the D-D profile in Fig. 1.
Wherein:1. valve body, 2. main valve core bore, 3. main valve plug, 4. main valve plug piston, 5. fine motion valve core piston, 6. control and live Plug end cap, 7. fine motion valve element, 8. screw plug, 9. oil inlet passage, 10. compensating spool, 11. banked direction control valves oil suction chambers, 12. overflow valves, 13. Overflow valve adjusting screw, 14. recuperation valves control piston, 15. recuperation valve adjusting screws, 16. fine motion spool bore, 17. control end caps.
Specific embodiment
The present invention is further illustrated below in conjunction with the accompanying drawings.
As shown in Figure 1, 2, the present invention includes two valve bodies 1, base plate and top board, and described valve body 1 is provided with fuel feed hole and two Group valve block, fuel feed hole is through hole, and described two valve bodies 1, base plate and top board are connected by screw, and two valve bodies 1 are located at base plate and top Between plate, the fuel feed hole connection of two valve bodies 1;Seal between base plate and top board and valve body 1, seal between two valve bodies 1.Described bottom On the face that the oil-in of the plate and mounting of roof plate fuel feed hole in two valve bodies 1 is located.The oil-feed of valve body 1 is corresponded on described top board Hole is provided with fuel feed hole.Being respectively arranged at two ends with of valve body 1 controls end cap 17 and controls piston end cap 6.
As shown in Fig. 2 every group of described valve block includes main valve core bore 2, fine motion spool bore 16, recuperation valve core bore 1-4, oil-feed Passage 9,11, two oil outlet 1-2 of banked direction control valves oil suction chamber and two oil leak hole 1-3;Described main valve core bore 2, fine motion spool bore 16 and recuperation valve core bore 1-4 be set in parallel on valve body 1;Divide in main valve core bore 2, fine motion spool bore 16 and recuperation valve core bore 1-4 Main valve plug 3, fine motion valve element 7 and compensating spool 10 be not installed, a diameter of 22mm of main valve plug 3, fine motion valve element 7 a diameter of 7mm.The stroke of main valve plug 3 and fine motion valve element 7 is all 8mm.Main valve plug 3 Opening pressure is 0.5MPa, the unlatching pressure of fine motion valve element 7 Power is 0.2MPa.
Corresponding to the main valve plug 3 on valve body 1 and fine motion valve element 7, piston end cap 6 is controlled to be provided with main valve plug piston hole 6-1 With fine motion valve element piston hole 6-2, main valve plug piston hole 6-1 and fine motion valve element piston hole 6-2 tail end pass through pipeline communication, on pipeline It is provided with the first control port 6-3;The main valve plug piston 4 of main valve plug 3 is located in main valve plug piston hole 6-1, the fine motion of fine motion valve element 7 Valve element controls piston 5 to be located in fine motion valve element piston hole 6-2.
Corresponding to the main valve plug 3 on valve body 1 and fine motion valve element 7, control end cap 17 be provided with main valve plug control hole 17-1 and The tail end of fine motion valve element control hole 17-2, main valve plug control hole 17-1 and fine motion valve element control hole 17-2 passes through pipeline communication, pipe Road is provided with the second control port 17-3;The end of main valve plug 3 is located in main valve plug control hole 17-1, the end of fine motion valve element 7 In fine motion valve element control hole 17-2.
Described oil inlet passage 9 is connected with the fuel feed hole of valve body 1, and oil inlet passage 9 is entered by recuperation valve core bore and banked direction control valves Oil pocket 11 connects, and banked direction control valves oil suction chamber 11 passes through main valve core bore 2 and fine motion spool bore 16 and two oil outlet 1-2 and two drainings Hole 1-3 connects.Two oil leak hole 1-3 are arranged respectively close to the two ends of valve body 1, and two oil outlet 1-2 are located at two oil leak hole 1-3 Between, the both sides of banked direction control valves oil suction chamber 11.
Corresponding to compensating spool 10, end cap 17 is controlled to be provided with adjusting screw 15, the end of adjusting screw 15 and recuperation valve The recuperation valve of core 10 controls piston 14 to contact;Recuperation valve core bore 1-4 is provided with screw plug 8 towards the one end controlling piston end cap 6.Corresponding It is provided with spout hole at the spring of compensating spool 10, spout hole is connected with recuperation valve core bore 1-4;Overflow in the hole is provided with overflow valve 12, corresponding to overflow valve 12, valve body is provided with overflow valve adjusting screw 13.
The concrete operating principle of the present invention is as follows:
Fluid enters oil inlet passage 9 through fuel feed hole, then after pressure compensation valve element 10 decompression, enters banked direction control valves oil suction chamber 11, when the two ends of main valve plug 3 and fine motion valve element 7 all no control fluid, main valve plug 3 and fine motion valve element 7 are placed in middle position, and two is fuel-displaced The obstructed oil of hole 1-2.
When the first control port 6-3 of left end of the present invention leads to pressure oil, fluid enters main valve through the first control port 6-3 Core 3 and the left chamber of fine motion valve element 7, now have two kinds of situations:
If the present invention needs micro-positioning regulators, control pressure is more than 0.2MPa, less than 0.5MPa, that is, its be enough to overcome micro- Movable valve plug 7 spring force and be less than main valve plug 3 spring force.Now, fine motion valve element 7 overcomes its spring force to move to right, and fluid is from banked direction control valves The oil outlet through fine motion valve element 7 and the right for the oil suction chamber 11 is connected, and the oil outlet on the left side passes through the draining of fine motion spool bore and the right Hole is connected.Because of fine motion valve element 7 diameter only 7mm so that flowing through the fluid flow of valve element entrance the right oil outlet seldom, Jin Ershi The fine setting of existing flow system flow.
If system needs high flow rate oil supply, when that is, control pressure is more than 0.5MPa.Now, main valve plug 3 and inching valve Core 7 overcome together its each spring force and move to right, fluid is from banked direction control valves oil suction chamber 11 through fine motion valve element 7 and main valve plug 3 and the right Oil outlet connect, the oil leak hole on the oil outlet on the left side and the left side is connected.Because main valve plug 3 is relatively large in diameter, and itself and fine motion valve element 7 Action together, can meet system big flow demand.
Because two kinds of situations are in feedback load pressure, the principle realized during pressure compensation is consistent, now only passes through fine motion valve element 7 Action specification:When fine motion valve element 7 moves to right, a fluid part for banked direction control valves oil suction chamber 11 enters going out of the right through fine motion valve element 7 Oilhole, a part of compensated valve element 10 spool bore feeds back to compensating spool 10 valve element left end.Now, load pressure oil is by the right The spool bore through fine motion valve element 7 right side for the oil outlet flows into load feedback oil duct, then through external oil pipe and the outside oil of feedback pressure oil Pipe joint, flows into compensating spool 10 spring cavity.Compensating spool 10 is in oil-feed cavity pressure, load pressure and itself spring force altogether It is in poised state under same-action, and from equilibrium relation, oil-feed cavity pressure is definite value with the difference of load pressure, i.e. fine motion Before and after valve element 7, pressure reduction is definite value.From flow formula, in the case that pressure reduction is certain, flow through flow and the valve element of fine motion valve element 7 Displacement is directly proportional.Now, the accurate adjustment of flow system flow just can be realized by adjusting the size of control-oil pressure.By adjusting The adjusting screw 15 of compensating spool 10 realizes the regulation to pressure reduction before and after valve element.Load in the spring cavity entering compensating spool 10 On feedback oil circuit, devise overflow valve 12, to control feedback oil liquid pressure, its oil pressure relief can pass through overflow valve adjusting screw 13 Adjust.
When the second control port 17-3 of system right-hand member leads to pressure oil, fluid enters main valve through the second control port 17-3 Core 3 and the right-hand member of fine motion valve element 7, now also have two kinds of situations:
If system needs micro-positioning regulators, control pressure is more than 0.2MPa, and less than 0.5MPa, that is, it be enough to overcome fine motion The spring force of valve element 7 and be less than the spring force of main valve plug 3.Now, fine motion valve element 7 overcomes its spring force to move to left, and fluid is from multichannel The fuel feed hole through fine motion valve element 7 and the left side for the valve oil suction chamber 11 is connected, the fuel feed hole on the right with by fine motion spool bore and the right Oil leak hole is connected.Because fine motion valve element 7 only has 7mm so that flowing through the fluid flow of valve element entrance left side fuel feed hole seldom, Jin Ershi The fine setting of existing flow system flow.
If system needs high flow rate oil supply, when that is, control pressure is more than 0.5MPa.Now, main valve plug 3 and inching valve Core 7 overcome together its each spring force and move to left, fluid is from banked direction control valves oil suction chamber 11 through fine motion valve element 7 and main valve plug 3 and the left side Fuel feed hole connect, the fuel feed hole on the right and oil leak hole are connected.Because main valve plug 3 is relatively large in diameter, and it is started with fine motion valve element 7 one Make, system big flow demand can be met.
Implementation when pressure compensated implementation is moved to right with valve element is consistent, negative by the fuel feed hole on the feedback left side Carry pressure, before and after keeping main valve plug 3 or fine motion valve element 7, pressure reduction is constant, in order to realize flow system flow accurate adjustment, reduce hydraulic pressure System speed governing valve element quantity, reduces cost, reduces leakage.

Claims (7)

1. a kind of load sensing multi-way valve with fine motion valve element, including at least one valve body;Valve body is provided with one or more groups of valves Piece and fuel feed hole;The two ends of described valve body are provided with control end cap and control piston end cap;
Described valve block include main valve core bore, fine motion spool bore, recuperation valve core bore, oil inlet passage, banked direction control valves oil suction chamber, multiple go out Oilhole and multiple oil leak hole;Described main valve core bore, fine motion spool bore and recuperation valve core bore are set in parallel on valve body;Main valve plug Hole, fine motion spool bore and compensating spool in the hole are separately installed with main valve plug, fine motion valve element and compensating spool;Corresponding on valve body Main valve plug and fine motion valve element, control piston end cap be provided with main valve plug piston hole and fine motion valve element piston hole, main valve plug piston Hole and fine motion valve element piston hole tail end pass through pipeline communication, and pipeline is provided with the first control port;The main valve plug of main valve plug controls Piston is located at main valve plug piston in the hole, and the fine motion valve element of fine motion valve element controls piston to be located in fine motion valve element piston hole;Correspond to Main valve plug on valve body and fine motion valve element, control end lid is provided with main valve plug control hole and fine motion valve element control hole, main valve plug control The tail end of drilling and fine motion valve element control hole passes through pipeline communication, and pipeline is provided with the second control port;The end position of main valve plug Control in the hole in main valve plug, the end of fine motion valve element is located in fine motion valve element control hole;Oil inlet passage is connected with the fuel feed hole of valve body Logical, oil inlet passage is connected with banked direction control valves oil suction chamber by recuperation valve core bore, and banked direction control valves oil suction chamber passes through main valve core bore and inching valve Core bore is connected with multiple oil outlets and multiple oil leak hole.
2. the load sensing multi-way valve with fine motion valve element according to claim 1, is characterized in that:Including multiple valve bodies and Base plate, the fuel feed hole of described valve body is through hole, and described multiple valve bodies and base plate are connected by screw, between adjacent valve body And seal between valve body and base plate, base plate is arranged on the face at oil-in place of fuel feed hole on valve body.
3. the load sensing multi-way valve with fine motion valve element according to claim 1 and 2, is characterized in that:Corresponding to compensation Valve element, control end lid is provided with adjusting screw, the spring end in contact of the end of adjusting screw and compensating spool;Recuperation valve core bore court It is provided with screw plug to controlling piston end cap end.
4. the load sensing multi-way valve with fine motion valve element according to claim 1 and 2, is characterized in that:Described valve block, Corresponding to being provided with spout hole at the spring of compensating spool, spout hole is connected with recuperation valve core bore;Overflow in the hole is provided with overflow valve, right Should be in overflow valve, valve body is provided with overflow valve adjusting screw.
5. the load sensing multi-way valve with fine motion valve element according to claim 1 and 2, is characterized in that:Described valve block It is provided with two oil outlets and two oil leak hole, two oil leak hole are arranged respectively close to the two ends of valve body, and two oil outlets are located at two Between individual oil leak hole, the both sides of banked direction control valves oil suction chamber.
6. the load sensing multi-way valve with fine motion valve element according to claim 1 and 2, is characterized in that:Described main valve A diameter of 22mm of core, a diameter of 7mm of fine motion valve element, spool stroke is all 8mm.
7. the load sensing multi-way valve with fine motion valve element according to claim 1 and 2, is characterized in that:Main valve plug is opened Pressure is 0.5MPa, and the Opening pressure of fine motion valve element is 0.2MPa.
CN201510062761.4A 2015-02-06 2015-02-06 Load-sensitive multiway valve with micromotion valve element Active CN104776077B (en)

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CN201510062761.4A CN104776077B (en) 2015-02-06 2015-02-06 Load-sensitive multiway valve with micromotion valve element

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CN201510062761.4A CN104776077B (en) 2015-02-06 2015-02-06 Load-sensitive multiway valve with micromotion valve element

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CN104776077B true CN104776077B (en) 2017-02-22

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109131550B (en) * 2018-09-05 2021-05-07 芜湖中意液压科技股份有限责任公司 Displacement-adjustable flow amplification hydraulic steering gear
CN111963506B (en) * 2020-08-07 2022-05-17 太原理工大学 Multi-way valve of double-valve-core crane capable of accurately controlling micro flow

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2245017A1 (en) * 1972-09-14 1974-04-11 Reinhard Kucharzyk PRE-CONTROLLED AND REMOTE CONTROLLED HYDRAULIC, SELF-CONTROLLING DIRECTIONAL VALVE, ALSO SUITABLE FOR GAS MEDIA
US4617854A (en) * 1983-06-14 1986-10-21 Linde Aktiengesellschaft Multiple consumer hydraulic mechanisms
CN202851491U (en) * 2012-09-19 2013-04-03 浙江高宇液压机电有限公司 Load-sensitive multi-way valve used in loader variable system
CN202913450U (en) * 2012-11-16 2013-05-01 浙江高宇液压机电有限公司 Pressure compensator used for loader
CN203822733U (en) * 2014-03-28 2014-09-10 四川长江液压件有限责任公司 Full load sensitive multitandem valve used for caterpillar crane

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2245017A1 (en) * 1972-09-14 1974-04-11 Reinhard Kucharzyk PRE-CONTROLLED AND REMOTE CONTROLLED HYDRAULIC, SELF-CONTROLLING DIRECTIONAL VALVE, ALSO SUITABLE FOR GAS MEDIA
US4617854A (en) * 1983-06-14 1986-10-21 Linde Aktiengesellschaft Multiple consumer hydraulic mechanisms
CN202851491U (en) * 2012-09-19 2013-04-03 浙江高宇液压机电有限公司 Load-sensitive multi-way valve used in loader variable system
CN202913450U (en) * 2012-11-16 2013-05-01 浙江高宇液压机电有限公司 Pressure compensator used for loader
CN203822733U (en) * 2014-03-28 2014-09-10 四川长江液压件有限责任公司 Full load sensitive multitandem valve used for caterpillar crane

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