CN102367817A - Inlet pressure compensator in hydraulic control loop - Google Patents
Inlet pressure compensator in hydraulic control loop Download PDFInfo
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- CN102367817A CN102367817A CN2011103665268A CN201110366526A CN102367817A CN 102367817 A CN102367817 A CN 102367817A CN 2011103665268 A CN2011103665268 A CN 2011103665268A CN 201110366526 A CN201110366526 A CN 201110366526A CN 102367817 A CN102367817 A CN 102367817A
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Abstract
The invention discloses an inlet pressure compensator in a hydraulic control loop. The inlet pressure compensator comprises a pressure insert member, a pressure control element, a pressure balancing, unloading and distributing elements, a pressure detection contact point and a valve body, wherein the pressure inserting member and the pressure control element are combined together and then arranged on an oil inlet path of the valve body to form a pressure reducing valve, and a constant-difference type pressure reducing valve is formed in a connection manner of oil paths; and the pressure balancing, unloading and distributing elements are symmetrically arranged on an oil path A and an oil path B of the valve body and are connected with an outlet of the pressure control element, so that the pressure inserting member, the pressure control element and the pressure balancing, unloading and distributing elements constitute the constant-difference type pressure reducing valve for an oil path P->A or P->B. The inlet pressure compensator disclosed by the invention is adjustable and is of a stacking type and can be used for constituting the hydraulic control loop together with a proportional valve, a hydraulic control one-way valve and an oil cylinder of an actuating mechanism so as to achieve the purpose of making the actuating mechanism operate stably. The inlet pressure compensator disclosed by the invention is suitable to different working occasions and various working conditions, and has better flexibility.
Description
Technical field
The present invention relates to technical field of hydraulic, be specifically related under a kind of operating mode of varying load in hydraulic control circuit in order to the steady inlet pressure compensator of control of the speed that guarantees actuator.
Background technique
In technical field of hydraulic; Exist the load of variation in the running of many hydraulic actuators; In this case, if adopt common oil hydraulic circuit control mode, owing to the influence of load causes the flow control valve inlet outlet pressure differential to have bigger variation to cause actuator's speed extremely instability and out-of-control phenomenon; Even some oil hydraulic circuit has adopted proportional valve control, also may can't reach the purpose of speed smooth running through the electrical signal compensation owing to load variations is too big.It is reported; There is a kind of ZDC type inlet pressure compensator in German Bosch's BOSCH-REXROTH (REXROTH) company at present; In its product information RC29224/06.99, can find, but its compensatory pressure is unadjustable and compensatory pressure can not detect, and does not retrieve Related product and applies for a patent in China.
Summary of the invention
For solving the problems referred to above that existing technology exists; The present invention will design the inlet pressure compensator in a kind of hydraulic control circuit; Solve in the existing hydraulic control circuit for problems such as speed controlling instability that the actuator under the varying load operating mode produced, rigidity differences the purpose that actuator is reached operate steadily.
To achieve these goals; Technological scheme of the present invention is following: the inlet pressure compensator in a kind of hydraulic control circuit; Comprise pressure plug-in unit, pressure control valve, pressure balance off-load distribution member, Pressure testing contact and valve body; Described pressure plug-in unit and pressure control valve are combined and are constituted a reduction valve on the in-line that is installed in valve body, and form the setting difference type reduction valve through the Placement of oil circuit; Described pressure balance off-load distribution member is arranged symmetrically on the oil circuit A and oil circuit B of valve body; And be connected with the outlet of pressure control valve, make pressure plug-in unit, pressure control valve and pressure balance off-load distribution member constitute the setting difference type reduction valve of P → A or P → B; Described Pressure testing contact connection pressure gauge or pressure transducer are used to detect the working state of inlet pressure compensator.
Valve body of the present invention adopts the spheroidal graphite cast iron casting.
Compared with prior art, the present invention has following beneficial effect:
1, the present invention is a kind of adjustable overlapping inlet pressure compensator, and itself and Proportional valve, Pilot operated check valve and actuator's oil cylinder are formed hydraulic control circuit, the purpose that actuator is reached operate steadily.Its principle is following: have the characteristic of throttle valve based on Proportional valve, and the Flow characteristics equation of its throttle valve: q
v=KS Δ p
mWherein flow coefficient k and restriction shape index m are certain for certain valve; Throttle valve flow area S is artificial sets or given relatively through program, and for the constant pressure pumping station controlling system, just is decided by the variation of load, the flow q of load like this through the pressure drop Δ p of throttle valve
vVariation will depend on the variation of load and cause the variation of throttle valve pressure drop Δ p that promptly the speed of actuator receives Δ p
mInfluence.The Δ p of P → A oil circuit and P → B oil circuit that adjustable overlapping inlet pressure compensator is used for stablizing passing ratio valve (throttle valve) exactly is constant basically, thereby has guaranteed the constant airspeed and the stationarity of actuator.
2, the present invention adopts a pressure plug-in unit, a pressure control valve, a balance off-load distribution member and the assembling of a casting valve body to constitute; The installation of this adjustable overlapping inlet pressure compensator can be superimposed on the Proportional valve bottom easily; The pressure reduction that can limit passing ratio electro-hydraulic reversing valve import P → A oil circuit and P → B oil circuit during work is constant; Thereby guarantee the influence that the flow of Proportional valve under certain electric current do not changed by load force; Flow through Proportional valve keeps original linear performance, the occasion that suitable load variations is bigger.
3, P of the present invention → A oil circuit and P → B oil circuit pressure reduction is adjustable; Can combine the situation of needed flow and pressure difference to regulate according to need of load and the Proportional valve performance that reality is used; The more convenient needs that are suitable for different operating occasion and various operating modes have better flexibility.
4, the present invention is provided with partial pressure and detects contact on the valve body of inlet pressure compensator, can carry out pressure measurement and monitoring.
5, the present invention is very convenient to type selecting in design, and its specification has comprised normally used DN10, DN16, DN25, DN32, selects for use this pressure compensator also to simplify the design work amount of hydraulic circuit valve piece.Installation dimension meets the ISO4401 Conncetion cimension.
6, project organization of the present invention is compact, and boundary dimension is little, is convenient to design and installation and arranges; Valve body adopts the spheroidal graphite cast iron casting, makes the inner passage reasonable Arrangement, reduces fluid resistance.
Description of drawings
5 in the total accompanying drawing of the present invention, wherein:
Fig. 1 is adjustable overlapping inlet pressure compensator external form schematic representation.
Fig. 2 is the plan view of Fig. 1.
Fig. 3 is adjustable overlapping inlet pressure compensator schematic diagram.
Fig. 4 is adjustable overlapping inlet pressure compensator structure sectional drawing.
Fig. 5 is adjustable overlapping inlet pressure compensator typical case applicable working condition instance sketch.
Among the figure: 1. pressure plug-in unit, 2. pressure control valve, 3. pressure balance off-load distribution member, 4. Pressure testing contact, 5. Proportional valve, 6. Pilot operated check valve, 7. actuator's oil cylinder.
Embodiment
Below in conjunction with accompanying drawing the present invention is described further.Shown in Fig. 1-5; Inlet pressure compensator in a kind of hydraulic control circuit; Comprise pressure plug-in unit 1, pressure control valve 2, pressure balance off-load distribution member 3, Pressure testing contact 4 and valve body; Described pressure plug-in unit 1 is combined with pressure control valve 2 and is constituted a reduction valve on the in-line that is installed in valve body, and forms the setting difference type reduction valve through the Placement of oil circuit; Described pressure balance off-load distribution member 3 is arranged symmetrically on the oil circuit A and oil circuit B of valve body; And be connected with the outlet of pressure control valve 2, make pressure plug-in unit 1, pressure control valve 2 and pressure balance off-load distribution member 3 constitute the setting difference type reduction valve of P → A or P → B; Described Pressure testing contact 4 connection pressure gauges or pressure transducer are used to detect the working state of inlet pressure compensator.Described valve body adopts the spheroidal graphite cast iron casting.
Working principle of the present invention is following: the interface A of the size of adopting international standards on the pressure compensator, interface B, interface P, interface T, interface X and interface L link to each other with the corresponding interface of Proportional valve 5 with stacking type hydraulic control check valve 6 respectively; As Proportional valve 5 control P → when the B oil circuit communicates; A → T oil circuit is also connected; This moment, hydraulic oil will be through pressure plug-in unit 1, again through the piston cavity of the P of Proportional valve 5 → B oil circuit entering actuator oil cylinder 7; Piston rod is stretched out, and rod end chamber hydraulic oil then gets into fuel tank by the A → T oil circuit of Proportional valve 5.At this moment the interface T that makes pressure control valve 2 links to each other with the interface B of Proportional valve 5 because the spool of pressure balance off-load element 3 moves to left under the effect of P → B ' oil circuit pressure oil; Make pressure plug-in unit 1 and pressure control valve 2 constitute fixed poor decompression state; Define the pressure reduction of the P → B oil circuit of Proportional valve 5; Thereby can overcome the interference of the P → B oil circuit pressure reduction of the variation Comparative Examples valve 5 of load force; Make Proportional valve 5 can keep originally metering characteristics preferably, make actuator's oil cylinder 7 obtain the purpose of ideal stability operation.The effect of Pilot operated check valve 6 is for the interface A of pressure compensator when Proportional valve 5 is in the meta function and interface B pressure balance release, thereby guarantees actuator's oil cylinder 7 location securities locking.Can be simultaneously the pressure reduction of P → B oil circuit and P → A oil circuit be carried out auxiliary adjustment through pressure control valve 2, can make Proportional valve 5 have the control range of broad.
When actuator's oil cylinder 7 inverted running piston rods are withdrawn; The spool of the pressure balance off-load element 3 interface T that makes pressure control valve 2 that under the effect of P → A ' oil circuit pressure oil, moves to right links to each other with the interface A of Proportional valve 5; Then pressure plug-in unit 1 has constituted fixed poor decompression state equally with pressure control valve 2; Limited the pressure reduction of the P → A oil circuit of Proportional valve 5, actuator's oil cylinder 7 obtains the purpose of ideal stability operation equally at inverted running.
Claims (2)
1. the inlet pressure compensator in the hydraulic control circuit; It is characterized in that: comprise pressure plug-in unit (1), pressure control valve (2), pressure balance off-load distribution member (3), Pressure testing contact (4) and valve body; Described pressure plug-in unit (1) is combined with pressure control valve (2) and is constituted a reduction valve on the in-line that is installed in valve body, and forms the setting difference type reduction valve through the Placement of oil circuit; Described pressure balance off-load distribution member (3) is arranged symmetrically on the oil circuit A and oil circuit B of valve body; And be connected with the outlet of pressure control valve (2), make pressure plug-in unit (1), pressure control valve (2) and pressure balance off-load distribution member (3) constitute the setting difference type reduction valve of P → A or P → B; Described Pressure testing contact (4) connection pressure gauge or pressure transducer are used to detect the working state of inlet pressure compensator.
2. the inlet pressure compensator in a kind of hydraulic control circuit according to claim 1 is characterized in that: described valve body adopts the spheroidal graphite cast iron casting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103665268A CN102367817A (en) | 2011-11-17 | 2011-11-17 | Inlet pressure compensator in hydraulic control loop |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011103665268A CN102367817A (en) | 2011-11-17 | 2011-11-17 | Inlet pressure compensator in hydraulic control loop |
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| Publication Number | Publication Date |
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| CN102367817A true CN102367817A (en) | 2012-03-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011103665268A Pending CN102367817A (en) | 2011-11-17 | 2011-11-17 | Inlet pressure compensator in hydraulic control loop |
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| CN (1) | CN102367817A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108757595A (en) * | 2018-08-01 | 2018-11-06 | 本钢板材股份有限公司 | A kind of oil cylinder working-pressure compensator buffer loop |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201696376U (en) * | 2010-06-30 | 2011-01-05 | 广州白云液压机械厂有限公司 | Hydraulic pressure compensator |
| CN102032226A (en) * | 2010-12-29 | 2011-04-27 | 大连华锐股份有限公司 | Adjustable superposition type outlet pressure compensator |
| CN202326478U (en) * | 2011-11-17 | 2012-07-11 | 大连华锐重工集团股份有限公司 | Inlet pressure compensator in hydraulic control loop |
-
2011
- 2011-11-17 CN CN2011103665268A patent/CN102367817A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201696376U (en) * | 2010-06-30 | 2011-01-05 | 广州白云液压机械厂有限公司 | Hydraulic pressure compensator |
| CN102032226A (en) * | 2010-12-29 | 2011-04-27 | 大连华锐股份有限公司 | Adjustable superposition type outlet pressure compensator |
| CN202326478U (en) * | 2011-11-17 | 2012-07-11 | 大连华锐重工集团股份有限公司 | Inlet pressure compensator in hydraulic control loop |
Non-Patent Citations (1)
| Title |
|---|
| 叶小华等: "大流量进口压力补偿器的设计与仿真研究", 《机床与液压》, vol. 39, no. 19, 31 October 2011 (2011-10-31) * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108757595A (en) * | 2018-08-01 | 2018-11-06 | 本钢板材股份有限公司 | A kind of oil cylinder working-pressure compensator buffer loop |
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Owner name: DALIAN HUARUI HEAVY INDUSTRY GROUP CO., LTD. Free format text: FORMER OWNER: HUARUI CO., LTD., DALIAN Effective date: 20120405 |
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Effective date of registration: 20120405 Address after: 116013 Bayi Road, Xigang District, Liaoning, China, No. 169, No. Applicant after: Dalian Huarui Heavy Industry Group Co., Ltd. Address before: 116013 Bayi Road, Xigang District, Liaoning, China, No. 169, No. Applicant before: Huarui Co., Ltd., Dalian |
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Application publication date: 20120307 |