CN108331794A - A kind of hydraulic shunting system of arbitrary distribution pressure ratio - Google Patents
A kind of hydraulic shunting system of arbitrary distribution pressure ratio Download PDFInfo
- Publication number
- CN108331794A CN108331794A CN201810133390.8A CN201810133390A CN108331794A CN 108331794 A CN108331794 A CN 108331794A CN 201810133390 A CN201810133390 A CN 201810133390A CN 108331794 A CN108331794 A CN 108331794A
- Authority
- CN
- China
- Prior art keywords
- pilot operated
- pressure
- operated compound
- relief valve
- compound relief
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
- F15B13/022—Flow-dividers; Priority valves
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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
- F15B21/00—Common features of fluid actuator systems; Fluid-pressure actuator systems or details thereof, not covered by any other group of this subclass
- F15B21/04—Special measures taken in connection with the properties of the fluid
- F15B21/041—Removal or measurement of solid or liquid contamination, e.g. filtering
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/20—Excess-flow valves
- F16K17/22—Excess-flow valves actuated by the difference of pressure between two places in the flow line
- F16K17/24—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member
- F16K17/28—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member operating in one direction only
- F16K17/30—Excess-flow valves actuated by the difference of pressure between two places in the flow line acting directly on the cutting-off member operating in one direction only spring-loaded
-
- 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
- F15B2211/00—Circuits for servomotor systems
- F15B2211/60—Circuit components or control therefor
- F15B2211/615—Filtering means
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Control Of Fluid Pressure (AREA)
Abstract
The invention discloses a kind of hydraulic shunting systems of arbitrary distribution pressure ratio, including fuel tank, flow divider, constant displacement pump, motor and pressure regulation unit, fuel tank, flow divider input terminal, motor are connect with constant displacement pump, shaft coupling is connected between motor and constant displacement pump, two output ends of flow divider are all connected with pilot operated compound relief valve and reversal valve；Pressure regulation unit includes rack, leading screw and pilot operated compound relief valve, and two pilot operated compound relief valves are symmetricly set on the both sides of rack, and leading screw both ends are all connected with pilot operated compound relief valve；Leading screw includes screw rod and the spiral nut being connected on screw rod.The present invention controls the pretightning force of two pilot operated compound relief valve springs, and then the pressure of regulation relief valve by the nut on swing roller leading screw using ball-screw as executive component, to control the pressure of two branches, finally realize the pro rate of arbitrary pressure, applied widely, cost is relatively low.
Description
Technical field
The present invention relates to a kind of hydraulic systems, and in particular to a kind of hydraulic shunting system of arbitrary distribution pressure ratio.
Background technology
Pressure-control valve is broadly divided into overflow valve according to function and usage to divide, pressure reducing valve and sequence valve.Overflow valve can control
Hydraulic system keeps constant state when reaching set pressure, when hydraulic system pressure rise to more than overflow valve limit value
When, valve port can open carry out overflow, to ensure the safety of hydraulic system.
Pilot operated compound relief valve is made of pilot valve and main valve, and the effect of wherein pilot valve is for pressure release, therefore guide
The steady pressure of formula overflow valve is controlled by pilot valve and pressure spring, by rotary valve outside the i.e. adjustable bullet of pressure spring
The pretightning force of spring can realize the adjusting of hydraulic system oil pressure relief.
Typically now in order to realize that some specific pressure proportional parameter needs specially to design corresponding hydraulic system, i.e.,
One hydraulic system can only realize a specific pressure proportional, can not achieve other pressure proportionals, if wanting to realize other pressure
Ratio, it is necessary in addition design other hydraulic systems to meet, narrow application range is of high cost, therefore is badly in need of a kind of achievable pressure
The hydraulic system that power can be adjusted with arbitrary proportion.
Invention content
To solve the deficiencies in the prior art, the purpose of the present invention is to provide a kind of hydraulic separates of arbitrary distribution pressure ratio
The pro rate of arbitrary pressure, wide adaptation range may be implemented in streaming system.
In order to realize that above-mentioned target, the present invention adopt the following technical scheme that：A kind of hydraulic pressure of arbitrary distribution pressure ratio
Separate system, including fuel tank, flow divider, constant displacement pump, motor and pressure regulation unit, the fuel tank, flow divider input terminal, motor
It is connect with constant displacement pump, shaft coupling is connected between the motor and constant displacement pump, two output ends of the flow divider are all connected with
Pilot operated compound relief valve and reversal valve；The pressure regulation unit includes rack, leading screw and pilot operated compound relief valve, and two pilot-operated types overflow
Stream valve is symmetricly set on the both sides of rack, and the leading screw both ends are all connected with pilot operated compound relief valve；The leading screw includes screw rod and spiral shell
The rotating nut being connected on screw rod.
Further, it is provided with fixed baffle in the rack, plate hole, the nut both sides are provided on the fixed baffle
It is symmetrically arranged with fixed baffle, the screw rod passes through plate hole.
Further, the pilot operated compound relief valve includes pilot valve spring and regulating hand wheel of pressure, and the pilot valve spring passes through pressure regulation hand
Wheel connection leading screw.
Further, the fuel delivery of the constant displacement pump is steady state value.
Further, it is connected with air filter between the oil inlet and fuel tank of the constant displacement pump.
Further, pressure gauge and liquid level gauge are provided on the fuel tank.
Compared with prior art, the beneficial effects of the invention are as follows：The present invention passes through rotation using ball-screw as executive component
Nut on ball-screw controls the pretightning force of two pilot operated compound relief valve springs, and then the pressure of regulation relief valve, to control
The pressure for making two branches, finally realizes the pro rate of arbitrary pressure, applied widely, cost is relatively low.
Description of the drawings
Fig. 1 is the structural diagram of the present invention.
Fig. 2 is the structural schematic diagram of the pressure regulation unit of the present invention.
In figure：1, fuel tank, 2, pressure gauge, 3, air filter, 4, liquid level gauge, 5, constant displacement pump, 6, shaft coupling, 7, electronic
Machine, 8, flow divider, 9, pilot operated compound relief valve, 10, leading screw, 11, nut, 12, rack, 13, fixed baffle, 14, screw rod, 15, change
To valve, 16, regulating hand wheel of pressure, 17, main valve plug, 18, damping hole, 19, pilot valve spool, 20, main spool spring, 21, pilot valve spring.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
As depicted in figs. 1 and 2, a kind of hydraulic shunting system of arbitrary distribution pressure ratio, including fuel tank 1, flow divider 8,
Constant displacement pump 5, motor 7 and pressure regulation unit, fuel tank 1,8 input terminal of flow divider, motor equal 7 are connect with constant displacement pump 5, motor 7
Shaft coupling 6 is connected between constant displacement pump 5, two output ends of flow divider 8 are all connected with pilot operated compound relief valve 9 and reversal valve 15；It adjusts
It includes rack 12, leading screw 10 and pilot operated compound relief valve 9 to press unit, and two pilot operated compound relief valves 9 are symmetricly set on the two of rack 12
Side, 10 both ends of leading screw are all connected with pilot operated compound relief valve 9；Leading screw 10 includes screw rod 14 and the spiral nut being connected on screw rod 14
11；It is provided with fixed baffle 13 in rack 12, plate hole is provided on fixed baffle 13,11 both sides of nut are symmetrically arranged with fixed gear
Plate 13, it includes pilot valve spring 21 and regulating hand wheel of pressure 16 that screw rod 14, which passes through plate hole, pilot operated compound relief valve 9, and pilot valve spring 21 passes through tune
Handwheel 16 is pressed to connect leading screw 10, the fuel delivery of constant displacement pump 5 is steady state value, is connected between the oil inlet and fuel tank 1 of constant displacement pump 5 free
Air filter 3 is provided with pressure gauge 2 and liquid level gauge 4 on fuel tank 1.
In the present embodiment, when work, motor 7 drives constant displacement pump 5 to work by shaft coupling 6, is extracted from fuel tank 1
Hydraulic oil is entire circuit supplies hydraulic oil, and the hydraulic oil that constant displacement pump 5 flows out forms two fuel feeding branches, liquid by flow divider 8
Pressure oil flows to two pilot operated compound relief valves 9 respectively.
Nut 11 is rotated clockwise, leading screw 10 converts rotary motion to linear motion, and screw rod 14 moves in a straight line to the left,
The pilot valve spring 21 of the pilot operated compound relief valve 9 on the left side is caused to squeeze, increases the pretightning force of spring so that the pilot-operated type on the left side overflows
The oil pressure relief for flowing valve 9 increases, meanwhile, the oil pressure relief of the pilot operated compound relief valve 9 on the right reduces, and then adjusts this two branches
Pressure.
Similarly, rotating nuts 11 counterclockwise, leading screw 10 convert rotary motion to linear motion, and screw rod 14 does to the right straight line
Movement, causes to squeeze, increases the pretightning force of spring so that the elder generation on the right to the pilot valve spring 21 of the pilot operated compound relief valve 9 on the right
The oil pressure relief of conduction overflow valve 9 increases, meanwhile, the oil pressure relief of the pilot operated compound relief valve 9 on the left side reduces, so adjust this two
The pressure of branch.
The angle rotated by controlling nut 11, and then the screw rod 14 of adjusting screw 10 rotates left and right mobile distance, into
And the decrement of two pilot valve springs 21 is adjusted, its pretightning force is controlled, and then control the overflow pressure of two pilot operated compound relief valves 9
Power, to realize the arbitrary distribution to two branch pressures.
The oil pressure relief P1 of the pilot operated compound relief valve 9 on the left side, pre compressed magnitude X1；The pilot operated compound relief valve 9 on the right overflows
Flowing pressure P2, pre compressed magnitude X2；The rigidity of pilot valve spring 21 is K1, and the displacement of leading screw 10 is S, and relationship obtains following relational expression
One：
The ratio between the oil pressure relief P1 of the pilot operated compound relief valve 9 on the left side and the oil pressure relief P2 of pilot operated compound relief valve 9 on the right
That is Proportional coefficient K, relationship obtain following relational expression two：
The relationship between 10 displacement S of leading screw and arbitrary pressure proportional COEFFICIENT K can be obtained according to relational expression two, relationship obtains
Following relational expression three：
When nut 11 turns over the angles φ, the relationship in the displacement S and leading screw 10 of leading screw 10 between the helical pitch L of screw pair obtains such as
Lower relational expression four：
According to relational expression three and relational expression four, the pass between the angle φ that nut 11 turns over and arbitrary pressure proportional COEFFICIENT K
Be following relational expression five：
It although an embodiment of the present invention has been shown and described, for the ordinary skill in the art, can be with
Understanding without departing from the principles and spirit of the present invention can carry out these embodiments a variety of variations, modification, replace
And modification, the scope of the present invention is defined by the appended.
Claims (5)
1. a kind of hydraulic shunting system of arbitrary distribution pressure ratio, including fuel tank, flow divider, constant displacement pump, motor, feature
It is：Further include pressure regulation unit, the fuel tank, flow divider input terminal, motor are connect with constant displacement pump, the motor and fixed
Shaft coupling is connected between amount pump, two output ends of the flow divider are all connected with pilot operated compound relief valve and reversal valve；The pressure regulation
Unit includes rack, leading screw and pilot operated compound relief valve, and two pilot operated compound relief valves are symmetricly set on the both sides of rack, described
Leading screw both ends are all connected with pilot operated compound relief valve；The leading screw includes screw rod and the spiral nut being connected on screw rod.
2. a kind of hydraulic shunting system of arbitrary distribution pressure ratio according to claim 1, it is characterised in that：The machine
It is provided with fixed baffle on frame, plate hole is provided on the fixed baffle, the nut both sides are symmetrically arranged with fixed baffle, institute
It states screw rod and passes through plate hole.
3. a kind of hydraulic shunting system of arbitrary distribution pressure ratio according to claim 1, it is characterised in that：It is described fixed
The fuel delivery of amount pump is steady state value.
4. a kind of hydraulic shunting system of arbitrary distribution pressure ratio according to claim 1, it is characterised in that：It is described fixed
It is connected with air filter between the oil inlet and fuel tank of amount pump.
5. a kind of hydraulic shunting system of arbitrary distribution pressure ratio according to claim 1, it is characterised in that：The oil
Pressure gauge and liquid level gauge are provided on case.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810133390.8A CN108331794B (en) | 2018-02-09 | 2018-02-09 | Hydraulic pressure reposition of redundant personnel system of arbitrary distribution pressure proportion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810133390.8A CN108331794B (en) | 2018-02-09 | 2018-02-09 | Hydraulic pressure reposition of redundant personnel system of arbitrary distribution pressure proportion |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108331794A true CN108331794A (en) | 2018-07-27 |
| CN108331794B CN108331794B (en) | 2020-06-26 |
Family
ID=62928675
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810133390.8A Expired - Fee Related CN108331794B (en) | 2018-02-09 | 2018-02-09 | Hydraulic pressure reposition of redundant personnel system of arbitrary distribution pressure proportion |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108331794B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113323928A (en) * | 2021-05-24 | 2021-08-31 | 安徽工程大学 | Hydraulic pressure reposition of redundant personnel system of controllable and improvement pressure of proportion |
| CN113374745A (en) * | 2021-07-06 | 2021-09-10 | 中煤科工集团重庆研究院有限公司 | Hydraulic system for continuously conveying drill rods |
| CN113374744A (en) * | 2021-07-06 | 2021-09-10 | 中煤科工集团重庆研究院有限公司 | Continuous conveying drill rod hydraulic system with locking function |
| CN113374746A (en) * | 2021-07-06 | 2021-09-10 | 中煤科工集团重庆研究院有限公司 | Synchronous continuous conveying drill rod hydraulic system |
| CN113404731A (en) * | 2021-07-06 | 2021-09-17 | 中煤科工集团重庆研究院有限公司 | Synchronous continuous conveying drill rod hydraulic system with locking function |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6093172A (en) * | 1983-10-26 | 1985-05-24 | Yanmar Diesel Engine Co Ltd | Fuel injection valve for diesel-engine |
| JPH05302680A (en) * | 1992-02-28 | 1993-11-16 | Yokogawa Electric Corp | Check valve |
| CN101342402A (en) * | 2007-06-29 | 2009-01-14 | 科德曼及舒特莱夫公司 | Programmable shunt with electromechanical valve actuator |
| CN201679504U (en) * | 2010-05-17 | 2010-12-22 | 浙江大学 | Energy-saving type shield propulsion system compositely and synchronously controlling pressure and flow |
| CN102828460A (en) * | 2012-09-12 | 2012-12-19 | 三一重工股份有限公司 | High and low pressure integrated water sprinkler system and engineering machine |
| CN103090048A (en) * | 2011-10-27 | 2013-05-08 | 北京精密机电控制设备研究所 | High-flow direct-drive digital servo valve |
| CN103807230A (en) * | 2012-11-12 | 2014-05-21 | 浙江蓝龙科技有限公司 | Idle-stroke forward shunt system for artificial diamond press |
| CN204113776U (en) * | 2014-10-11 | 2015-01-21 | 安徽合力股份有限公司 | A kind of energy-conservation second voltage regulation loop of hydraulic system |
| CN106015139A (en) * | 2016-07-20 | 2016-10-12 | 浙江大学 | Tension and compression testing machine hydraulic loading system adopting differential control of proportional overflow valves |
| CN106151138B (en) * | 2016-06-29 | 2017-12-08 | 安徽工程大学 | The assignment of traffic hydraulic system that a kind of hydrostatic slideway can be adjusted with arbitrary proportion |
-
2018
- 2018-02-09 CN CN201810133390.8A patent/CN108331794B/en not_active Expired - Fee Related
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6093172A (en) * | 1983-10-26 | 1985-05-24 | Yanmar Diesel Engine Co Ltd | Fuel injection valve for diesel-engine |
| JPH05302680A (en) * | 1992-02-28 | 1993-11-16 | Yokogawa Electric Corp | Check valve |
| CN101342402A (en) * | 2007-06-29 | 2009-01-14 | 科德曼及舒特莱夫公司 | Programmable shunt with electromechanical valve actuator |
| CN201679504U (en) * | 2010-05-17 | 2010-12-22 | 浙江大学 | Energy-saving type shield propulsion system compositely and synchronously controlling pressure and flow |
| CN103090048A (en) * | 2011-10-27 | 2013-05-08 | 北京精密机电控制设备研究所 | High-flow direct-drive digital servo valve |
| CN102828460A (en) * | 2012-09-12 | 2012-12-19 | 三一重工股份有限公司 | High and low pressure integrated water sprinkler system and engineering machine |
| CN103807230A (en) * | 2012-11-12 | 2014-05-21 | 浙江蓝龙科技有限公司 | Idle-stroke forward shunt system for artificial diamond press |
| CN204113776U (en) * | 2014-10-11 | 2015-01-21 | 安徽合力股份有限公司 | A kind of energy-conservation second voltage regulation loop of hydraulic system |
| CN106151138B (en) * | 2016-06-29 | 2017-12-08 | 安徽工程大学 | The assignment of traffic hydraulic system that a kind of hydrostatic slideway can be adjusted with arbitrary proportion |
| CN106015139A (en) * | 2016-07-20 | 2016-10-12 | 浙江大学 | Tension and compression testing machine hydraulic loading system adopting differential control of proportional overflow valves |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113323928A (en) * | 2021-05-24 | 2021-08-31 | 安徽工程大学 | Hydraulic pressure reposition of redundant personnel system of controllable and improvement pressure of proportion |
| CN113374745A (en) * | 2021-07-06 | 2021-09-10 | 中煤科工集团重庆研究院有限公司 | Hydraulic system for continuously conveying drill rods |
| CN113374744A (en) * | 2021-07-06 | 2021-09-10 | 中煤科工集团重庆研究院有限公司 | Continuous conveying drill rod hydraulic system with locking function |
| CN113374746A (en) * | 2021-07-06 | 2021-09-10 | 中煤科工集团重庆研究院有限公司 | Synchronous continuous conveying drill rod hydraulic system |
| CN113404731A (en) * | 2021-07-06 | 2021-09-17 | 中煤科工集团重庆研究院有限公司 | Synchronous continuous conveying drill rod hydraulic system with locking function |
| CN113374744B (en) * | 2021-07-06 | 2022-05-06 | 中煤科工集团重庆研究院有限公司 | Continuous conveying drill rod hydraulic system with locking function |
| CN113404731B (en) * | 2021-07-06 | 2022-05-20 | 中煤科工集团重庆研究院有限公司 | Synchronous continuous conveying drill rod hydraulic system with locking function |
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| Publication number | Publication date |
|---|---|
| CN108331794B (en) | 2020-06-26 |
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Granted publication date: 20200626 Termination date: 20220209 |