CN104006019A - Load-sensitive control valve capable of remotely adjusting pressure difference - Google Patents
Load-sensitive control valve capable of remotely adjusting pressure difference Download PDFInfo
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- CN104006019A CN104006019A CN201410207173.0A CN201410207173A CN104006019A CN 104006019 A CN104006019 A CN 104006019A CN 201410207173 A CN201410207173 A CN 201410207173A CN 104006019 A CN104006019 A CN 104006019A
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- oil duct
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- lower oil
- sensitive control
- control valve
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- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 101000596046 Homo sapiens Plastin-2 Proteins 0.000 description 1
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- 238000006073 displacement reaction Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
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Abstract
The invention discloses a load-sensitive control valve capable of remotely adjusting the pressure difference. The load-sensitive control valve comprises a front valve block and a rear valve block. Upper oil ducts, a first lower oil duct, a second lower oil duct, a third lower oil duct and a fourth lower oil duct are formed in the front valve block and the rear valve block, wherein the upper oil ducts are communicated, the first lower oil duct, the second lower oil duct, the third lower oil duct and the fourth lower oil duct are communicated with the upper oil ducts, the first lower oil duct is communicated with the second lower oil duct, plugs are matched with the outer end of the first lower oil duct, the outer end of the second lower oil duct, the outer end of the third lower oil duct and the outer end of the fourth lower oil duct, and the upper portions of the upper oil ducts are communicated with an upper oil cavity. The load-sensitive control valve capable of remotely adjusting the pressure difference has the function of limiting power, the maximum input power of a pump is limited through constant power and the pressure turn-off control function, and the load-sensitive control valve works at any point in an envelop line range according to load requirements.
Description
Technical field
The present invention relates to control valve field, specifically belong to can remote adjustment pressure reduction load-sensitive control valve.
Background technique
Load sensitive system is that one is experienced system pressure-traffic demand, and the oil hydraulic circuit of required flow and pressure is only provided.The intact device that realizes load-sensitive control is made up of following element: first need a Variable plunger pump, this pump has a pressure compensator, and when system is not worked, compensator can be in the lower small flow working state of protecting of lower pressure (200PSI).In the time that system proceeds to working state, the traffic demand of compensator impression system also provides adjustable flow according to traffic demand in the time that system condition changes.Meanwhile, the pressure demand of hydraulic system also will be experienced and respond to oil hydraulic pump.Most hydraulic systems are not worked under constant pressure, in the time that external load changes, the working pressure of hydraulic system is different, once this patent mainly solves the responsive stroking mechanism pressure reduction of conventional load and adjusts the problem that is difficult for adjusting, can be according to system works demand, the long-range pressure reduction to stroking mechanism regulates.
Summary of the invention
The object of this invention is to provide a kind of load-sensitive control valve that can remote adjustment pressure reduction, because being greater than small end, the active area of the large end of flow piston make flow piston move and realize pump delivery and be reduced to delivery side of pump flow and only can maintain to set up and set the state of equilibrium of pressure reduction to small end, this can remote adjustment pressure reduction load-sensitive control valve there is Power Limitation effect, the maximal input of the pump of permanent power and pressure cut off control limit of functions, load-sensitive control valve need to arbitrfary point work within the scope of this envelope according to load.
Technological scheme of the present invention is as follows:
Load-sensitive control valve that can remote adjustment pressure reduction, include front valve piece, rear valve piece, front valve piece, in rear valve piece, have the upper oil duct that communicates, and the first time oil duct communicating with upper oil duct, second time oil duct, the 3rd time oil duct, the 4th time oil duct, first time oil duct and second time oil duct are connected, first time oil duct, second time oil duct, the 3rd time oil duct, the 4th time oil duct outer end is combined with screw plug, upper oil duct top is communicated with upper oil cavitie, screw plug is installed on upper oil cavitie, in upper oil duct, be combined with front valve core, back valve core, there is free oil pocket in upper oil duct rear end UNICOM, in empty oil pocket, swivel nut is installed, swivel nut outer end is screwed with adjusting screw, in swivel nut, be sliding combined with the front spring seat that is pressed on adjusting screw, the bulb overhead of back valve core front end has rear spring seat, between front spring seat and rear spring seat, be equipped with big spring, little spring, back valve core is provided with first step, second step, intermediate step matches with upper oil duct.
Described front valve core has two steps.
Described front spring seat, screw plug, swivel nut are set with seal ring outward.
Working principle of the present invention and working procedure:
The present invention can remote adjustment pressure reduction load-sensitive valve block assembly be installed in BPA series pump, it is by leading to D mouth by delivery side of pump pressure oil, act on two step front valve core right sides by D mouth, two step upper valve cores also act on the power that LS2 pressure signal produces simultaneously, this acts on back valve core left side by two step front valve cores with joint efforts, back valve core right side acts on by big spring and lower spring compresses the spring force producing, also effect has LS1 feedback pressure simultaneously, while work by delivery side of pump pressure, the pressure differential deltap P(Δ P=PS+PLS2-PLS of LS2 and LS1 feedback pressure) back valve core is produced to the spring force balance that power to the right and big spring and little spring produce.When work, while constantly increasing along with this pressure differential deltap P, the hydraulic coupling of spool left end can increase gradually, at this moment back valve core can constantly move right and compress big spring and little spring, in the time that pressure reduction does not reach setting pressure, B mouth communicates with C mouth, pump is in large displacement condition, in the time that delivery side of pump pressure is increased to setting pressure reduction, spool moves right to B mouth and the disconnection of C mouth at effect lower compression big spring and the little spring of the hydraulic coupling of left end, A mouth and B mouth are connected simultaneously, at this moment delivery side of pump pressure oil acts on the large loculus of flow piston simultaneously, because being greater than small end, the active area of the large end of flow piston make flow piston move and realize pump delivery and be reduced to delivery side of pump flow and only can maintain to set up and set the state of equilibrium of pressure reduction to small end, the Main Function of PLS2 hydraulic pressure signal is that its load-sensitive control pressure reduction that can be in real time removes to change pump according to the work characteristics of system by hydraulic pressure signal, electrical signal or other inverted signal is to reach the object such as energy-conservation.
Brief description of the drawings
Fig. 1 is structural representation of the present invention.
Fig. 2 is that the present invention is applied to BPA series pump systematic schematic diagram.
Fig. 3 is the load-sensitive controlled variable performance diagram that the present invention can remote adjustment pressure reduction.
Embodiment
Referring to Fig. 1, load-sensitive control valve that can remote adjustment pressure reduction, includes front valve piece 1, rear valve piece 2, front valve piece 1, in rear valve piece 2, have the upper oil duct 3 that communicates, and the first time oil duct 4 communicating with upper oil duct 3, second time oil duct 5, the 3rd time oil duct 6, 7, the first times oil ducts 4 of the 4th time oil duct and second time oil duct 5 are connected, first time oil duct 4, second time oil duct 5, the 3rd time oil duct 6, the 4th time oil duct 7 outer ends are combined with screw plug 8, and upper oil duct 3 tops are communicated with upper oil cavitie 9, and screw plug 10 is installed on upper oil cavitie 9, in upper oil duct 3, are combined with front valve core 11, back valve core 12, there is free oil pocket 13 in upper oil duct 3 rear end UNICOMs, in empty oil pocket 13, swivel nut 14 is installed, swivel nut 14 outer ends are screwed with adjusting screw 15, in swivel nut 14, be sliding combined with the front spring seat 16 that is pressed on adjusting screw, the bulb overhead of back valve core 12 front ends has rear spring seat 17, between front spring seat and rear spring seat, is equipped with big spring, little spring, back valve core 12 is provided with first step 18, second step 20, intermediate step 21 matches with upper oil duct, and front valve core 11 has two steps, front spring seat, screw plug, swivel nut is set with seal ring outward.
In Fig. 2, label is pilot valve assembly 22, servovalve assembly 23, double step load-sensitive valve assembly 24, flow piston 25.
Claims (3)
1. load-sensitive control valve that can remote adjustment pressure reduction, include front valve piece, rear valve piece, it is characterized in that, front valve piece, in rear valve piece, have the upper oil duct that communicates, and the first time oil duct communicating with upper oil duct, second time oil duct, the 3rd time oil duct, the 4th time oil duct, first time oil duct and second time oil duct are connected, first time oil duct, second time oil duct, the 3rd time oil duct, the 4th time oil duct outer end is combined with screw plug, upper oil duct top is communicated with upper oil cavitie, screw plug is installed on upper oil cavitie, in upper oil duct, be combined with front valve core, back valve core, there is free oil pocket in upper oil duct rear end UNICOM, in empty oil pocket, swivel nut is installed, swivel nut outer end is screwed with adjusting screw, in swivel nut, be sliding combined with the front spring seat that is pressed on adjusting screw, the bulb overhead of back valve core front end has rear spring seat, between front spring seat and rear spring seat, be equipped with big spring, little spring, back valve core is provided with first step, second step, intermediate step matches with upper oil duct.
2. load-sensitive control valve that can remote adjustment pressure reduction according to claim 1, is characterized in that, described front valve core has two steps.
3. load-sensitive control valve that can remote adjustment pressure reduction according to claim 1, is characterized in that, described front spring seat, screw plug, swivel nut are set with seal ring outward.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410207173.0A CN104006019B (en) | 2014-05-15 | Can the Ioad-sensing control valve of remote adjustment pressure reduction |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410207173.0A CN104006019B (en) | 2014-05-15 | Can the Ioad-sensing control valve of remote adjustment pressure reduction |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104006019A true CN104006019A (en) | 2014-08-27 |
| CN104006019B CN104006019B (en) | 2016-11-30 |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107269612A (en) * | 2016-09-13 | 2017-10-20 | 江苏恒立液压科技有限公司 | Load sensing multi-way valve system |
| CN108302078A (en) * | 2018-03-19 | 2018-07-20 | 安徽博流体传动股份有限公司 | Remote-control pressure control valve |
| CN108571486A (en) * | 2018-07-06 | 2018-09-25 | 佛山信卓派思机械科技有限公司 | A kind of inserted valve for engineering machinery load sensory system |
| CN112081789A (en) * | 2020-09-07 | 2020-12-15 | 徐州阿马凯液压技术有限公司 | Load-sensitive high-pressure high-flow three-position four-way plate type hydraulic control reversing valve |
| CN112315327A (en) * | 2020-10-27 | 2021-02-05 | 珠海格力电器股份有限公司 | Cooking apparatus, control method thereof, control device thereof, and computer-readable storage medium |
| CN114060263A (en) * | 2021-12-10 | 2022-02-18 | 中国船舶重工集团公司第七0四研究所 | A Plunger Pump Variable Mechanism Combining Three Variable Forms into One |
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| US5445188A (en) * | 1993-05-27 | 1995-08-29 | Hydrolux S.A.R.L. | Pilot operated servo valve |
| US5896890A (en) * | 1994-11-06 | 1999-04-27 | Hydrolux S.A R.L. | Pilot-operated servo-valve |
| CN1241688A (en) * | 1998-05-29 | 2000-01-19 | Smc株式会社 | Electropneumatic proportional differential control valve |
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| CN201680023U (en) * | 2010-05-14 | 2010-12-22 | 郑州兴辰机电设备有限公司 | Self-balance unloading valve |
| CN201714403U (en) * | 2010-05-28 | 2011-01-19 | 郑州煤机液压电控有限公司 | High-flow rigid-seal plug-in type hydraulic control one-way valve |
| CN201972984U (en) * | 2010-12-30 | 2011-09-14 | 章信才 | Hydraulic differential pressure control valve |
| CN202056131U (en) * | 2011-05-25 | 2011-11-30 | 徐工集团工程机械股份有限公司科技分公司 | Plug-in one-way valve block |
| CN102720711A (en) * | 2012-06-29 | 2012-10-10 | 武汉船用机械有限责任公司 | Automatic-switch type load sensing hydraulic system |
| CN102887435A (en) * | 2012-10-19 | 2013-01-23 | 中联重科股份有限公司 | Hydraulic system for controlling amplitude variation of boom, control method and crane |
| CN202808201U (en) * | 2012-10-16 | 2013-03-20 | 中联重科股份有限公司 | Hydraulic control system and crane with same |
| CN103727082A (en) * | 2013-12-27 | 2014-04-16 | 三一汽车起重机械有限公司 | Hydraulic system and engineering machine |
| CN203584949U (en) * | 2013-12-16 | 2014-05-07 | 重庆红江机械有限责任公司 | Load sensitive constant power valve |
Patent Citations (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5445188A (en) * | 1993-05-27 | 1995-08-29 | Hydrolux S.A.R.L. | Pilot operated servo valve |
| US5896890A (en) * | 1994-11-06 | 1999-04-27 | Hydrolux S.A R.L. | Pilot-operated servo-valve |
| CN1241688A (en) * | 1998-05-29 | 2000-01-19 | Smc株式会社 | Electropneumatic proportional differential control valve |
| CN201173124Y (en) * | 2008-04-03 | 2008-12-31 | 郑州恒达液压工程中心 | Balancing bidirectional lock possessing pressure compensate function for balancing hoisting jack |
| CN201680023U (en) * | 2010-05-14 | 2010-12-22 | 郑州兴辰机电设备有限公司 | Self-balance unloading valve |
| CN201714403U (en) * | 2010-05-28 | 2011-01-19 | 郑州煤机液压电控有限公司 | High-flow rigid-seal plug-in type hydraulic control one-way valve |
| CN201972984U (en) * | 2010-12-30 | 2011-09-14 | 章信才 | Hydraulic differential pressure control valve |
| CN202056131U (en) * | 2011-05-25 | 2011-11-30 | 徐工集团工程机械股份有限公司科技分公司 | Plug-in one-way valve block |
| CN102720711A (en) * | 2012-06-29 | 2012-10-10 | 武汉船用机械有限责任公司 | Automatic-switch type load sensing hydraulic system |
| CN202808201U (en) * | 2012-10-16 | 2013-03-20 | 中联重科股份有限公司 | Hydraulic control system and crane with same |
| CN102887435A (en) * | 2012-10-19 | 2013-01-23 | 中联重科股份有限公司 | Hydraulic system for controlling amplitude variation of boom, control method and crane |
| CN203584949U (en) * | 2013-12-16 | 2014-05-07 | 重庆红江机械有限责任公司 | Load sensitive constant power valve |
| CN103727082A (en) * | 2013-12-27 | 2014-04-16 | 三一汽车起重机械有限公司 | Hydraulic system and engineering machine |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107269612A (en) * | 2016-09-13 | 2017-10-20 | 江苏恒立液压科技有限公司 | Load sensing multi-way valve system |
| CN108302078A (en) * | 2018-03-19 | 2018-07-20 | 安徽博流体传动股份有限公司 | Remote-control pressure control valve |
| CN108571486A (en) * | 2018-07-06 | 2018-09-25 | 佛山信卓派思机械科技有限公司 | A kind of inserted valve for engineering machinery load sensory system |
| CN112081789A (en) * | 2020-09-07 | 2020-12-15 | 徐州阿马凯液压技术有限公司 | Load-sensitive high-pressure high-flow three-position four-way plate type hydraulic control reversing valve |
| CN112081789B (en) * | 2020-09-07 | 2024-02-02 | 徐州阿马凯液压技术有限公司 | Load-sensitive high-pressure high-flow three-position four-way plate type hydraulic control reversing valve |
| CN112315327A (en) * | 2020-10-27 | 2021-02-05 | 珠海格力电器股份有限公司 | Cooking apparatus, control method thereof, control device thereof, and computer-readable storage medium |
| CN112315327B (en) * | 2020-10-27 | 2021-10-26 | 珠海格力电器股份有限公司 | Cooking apparatus, control method thereof, control device thereof, and computer-readable storage medium |
| CN114060263A (en) * | 2021-12-10 | 2022-02-18 | 中国船舶重工集团公司第七0四研究所 | A Plunger Pump Variable Mechanism Combining Three Variable Forms into One |
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Granted publication date: 20161130 |
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