CN106168234B - A kind of constant displacement pump variable delivery hydraulic system - Google Patents
A kind of constant displacement pump variable delivery hydraulic system Download PDFInfo
- Publication number
- CN106168234B CN106168234B CN201610548775.1A CN201610548775A CN106168234B CN 106168234 B CN106168234 B CN 106168234B CN 201610548775 A CN201610548775 A CN 201610548775A CN 106168234 B CN106168234 B CN 106168234B
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- valve
- mouthfuls
- displacement pump
- connect
- constant displacement
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Classifications
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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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
-
- 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
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Fluid-Pressure Circuits (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The present invention relates to the fuel feeding hydraulic system of constant displacement pump, to solve the problems, such as that existing constant displacement pump oil supply system is difficult to cope with the accessory fuel feeding of different flow requirement；A kind of constant displacement pump variable delivery hydraulic system is provided, including hydraulic actuating mechanism, the solenoid directional control valve for controlling hydraulic actuating mechanism, operation handle, constant displacement pump, hydraulic oil container, controller, flow input instrument, three-way flowrate valve；The output terminal of the operation handle and flow input instrument is connected with the corresponding input terminal of the controller, the correspondence output terminal of the controller is connect with the Electromagnetic Control end of the three-way flowrate valve and solenoid directional control valve, P mouthfuls of the oil inlet of the three-way flowrate valve is connect with the constant displacement pump, it works fuel-displaced A mouthfuls and is connect with the oil inlet of the solenoid directional control valve, B mouthfuls of oil return is connect with hydraulic oil container.The system structure is simple, of low cost；Spill losses is reduced, saves energy consumption；Combination of electric and hydraulic, control is reliable and stable, handling good；Quantitative system function is widened, makes quantitative system adaptability stronger.
Description
Technical field
The present invention relates to a kind of hydraulic system, more specifically to a kind of variable delivery hydraulic system using constant displacement pump.
Background technology
The flow of regulating system is carried out generally by the method for throttle grverning in hydraulic system with constant displacement pump, constant displacement pump section
Stream governing system flow extra in speed regulation process must can be only achieved the purpose of speed governing by overflow valve overflow, thus can
There are larger spill losses, and plus system, inherently there are restriction losses, the energy consumption of system and fever will be very big.It is quantitative
The discharge capacity of pump must the flow according to needed for system maximum select, generally require increase speed governing valve when driving small flow executing agency
The maximum stream flow of system offer is provided, can equally have very big flow in this way and waste, the flow of this part waste is also logical
It crosses overflow valve overflow to fall, spill losses is very serious.Or controlled by changing reversal valve opening, such operability will be very
Difference, and the pressure loss of spool can also increase, and equally can also aggravate energy consumption.If not limiting system maximum stream flow will cause
Executing agency exceeds the speed limit, and damages executing agency.
Certain customers can assemble accessory in front end when excavator works at present, some accessories need to turn round, accessory revolution or
Single movement does composite move together with digger operating device, and in order to improve the operability of complete machine, generally accessory turns round
Independent fuel feeding avoids the main hydraulic system with digger operating device from influencing each other.Accessory revolution generally only needs system to provide category
Flow needed for tool revolution, often changes without flow system flow, if being that system fuel feeding will cause functionally with variable pump
Waste and also cost can also rise can it is more, so accessory rotary system select constant displacement pump be system fuel feeding.Digging as shown in Figure 1
Pick machine accessory rotary system just belongs to appeal system, and reversal valve 8 is out three, center six-way transfer valve in figure, in engineering machinery
It is upper very universal, belong to the combination of inlet throttle speed governing and bypass throttle speed governing.Present excavator accessory type is various, each
Flow needed for accessory revolution is different, the discharge capacity of the general average flow rate setting constant displacement pump as needed for accessory revolution.For stream
The big accessory of amount demand is unable to reach rate request, can only meet the needs of accessory flow by replacing the discharge capacity of constant displacement pump.
And the above problem just will appear for the few accessory of flow demand, accessory exceeds the speed limit in order to prevent, can opening by operation handle 1
The opening of degree control solenoid directional control valve 8, makes solenoid directional control valve 8 be in non-open state always, to meet accessory rate request,
Can thus there be middle bit stream oil return box of a big chunk fluid by solenoid directional control valve 8 always, increase the pressure between valve port
Loss wastes energy, and operability is very poor；Speed governing valve can also be increased between constant displacement pump 4 and reversal valve 8 or in accessory
On working line respectively plus a speed governing valve, such overflow valve 6 will overflow always, similary system energy consumption is also very big.
Invention content
The technical problem to be solved by the present invention is to be directed to existing constant displacement pump oil supply system to be difficult to cope with different flow requirement
Accessory fuel feeding problem, and a kind of constant displacement pump variable delivery hydraulic system for being suitable for different flow requirement accessory fuel feeding is provided.
The present invention is such for the technical solution for realizing its purpose：A kind of constant displacement pump variable delivery hydraulic system is provided, including
Hydraulic actuating mechanism, solenoid directional control valve, operation handle, constant displacement pump, the hydraulic oil container for controlling hydraulic actuating mechanism；It is characterized in that
Further include controller, flow input instrument, three-way flowrate valve；The operation handle and flow input instrument output terminal with it is described
The correspondence input terminal connection of controller, the correspondence output terminal of the controller and the three-way flowrate valve and the electricity of solenoid directional control valve
Magnetic control end connects, and P mouthfuls of the oil inlet of the three-way flowrate valve connect with the constant displacement pump, works fuel-displaced A mouthfuls and changed with the electromagnetism
It is connected to the oil inlet of valve, B mouthfuls of oil return is connect with hydraulic oil container.
In above-mentioned constant displacement pump variable delivery hydraulic system, the three-way flowrate valve is made of proportional throttle valve and pressure-compensated valve,
The pressure-compensated valve is four-way valve, and oil inlet and outlet of two oil inlet respectively with the proportional throttle valve connects, and two go out
Hydraulic fluid port is connect respectively with work fuel-displaced A mouthful and B mouthfuls of oil return, the spring cavity control terminal of the pressure-compensated valve and ratio throttling
The outlet connection of valve, another control terminal of the pressure-compensated valve are connect with the oil inlet of the proportional throttle valve, the ratio
The oil inlet of throttle valve connects for P mouthfuls with oil inlet, and the electromagnetism end of the proportional throttle valve is connect with controller.
Compared with prior art, the present invention it has the following advantages：
1. it is simple in structure, it is of low cost；
2. reducing spill losses, energy consumption is saved；
3. combination of electric and hydraulic, control is reliable and stable, handling good；
4. widening quantitative system function, make quantitative system adaptability stronger.
Description of the drawings
Fig. 1 is hydraulic system with constant displacement pump schematic diagram in the prior art.
Fig. 2 is constant displacement pump variable delivery hydraulic system schematic diagram of the present invention.
Parts title and serial number in figure：
Operation handle 1, controller 2, flow input instrument 3, constant displacement pump 4, three-way flowrate valve 5, proportional throttle valve 51, pressure
Recuperation valve 52, overflow valve 6, check valve 7, solenoid directional control valve 8, executing agency 9, the first hydraulic fluid port overflow valve 10, the second hydraulic fluid port overflow
Valve 11.
Specific embodiment
Illustrate specific embodiment below in conjunction with the accompanying drawings.
As shown in Fig. 2, the constant displacement pump variable delivery hydraulic system in the present embodiment, mainly includes hydraulic actuating mechanism 9, control liquid
The solenoid directional control valve 8 of pressure actuator, operation handle 1, constant displacement pump 4, hydraulic oil container, controller 2, flow input instrument 3, threeway
5 grade components of flow valve.
Solenoid directional control valve 8 is three six-way valves, and A hydraulic fluid ports and B hydraulic fluid ports are connect respectively with hydraulic actuating mechanism, position in spool
Oil outlet is connected with hydraulic oil container, and three-way flow in parallel with position oil inlet in spool after the P mouths connection check valve of solenoid directional control valve 8
Measure the A hydraulic fluid ports connection of valve 5, T mouths of solenoid directional control valve 8 connect with hydraulic oil container, hydraulic actuating mechanism and solenoid directional control valve 8 it
Between two oil circuits connected respectively through the first hydraulic fluid port overflow valve 10, the second hydraulic fluid port overflow valve 11 with hydraulic oil container, the oil inlet of check valve
Mouth is connected through overflow valve 6 with hydraulic oil container.The both ends Electromagnetic Control end of solenoid directional control valve 8 connects with the corresponding output terminal of controller
It connects.
Three-way flowrate valve is made of proportional throttle valve and pressure-compensated valve, and pressure-compensated valve is four-way valve, two oil inlet
Mouthful connect respectively with the oil inlet and outlet of proportional throttle valve, two oil outlets are respectively with working fuel-displaced A mouthfuls and B mouthfuls of oil return is connect, pressure
The spring cavity control terminal of force compensating valve and the outlet of proportional throttle valve connect, another control terminal and the ratio throttling of pressure-compensated valve
The oil inlet connection of valve, P mouthfuls of oil inlet and the oil inlet of the proportional throttle valve connect, electromagnetism end and the control of the proportional throttle valve
Device connection processed.
The output terminal of operation handle and flow input instrument is connected with the corresponding input terminal of controller, and the correspondence of controller is defeated
Outlet is connect with the Electromagnetic Control end of proportional throttle valve in three-way flowrate valve and the Electromagnetic Control end of solenoid directional control valve, three-way flowrate
P mouthfuls of the oil inlet of valve is connect with the constant displacement pump, is worked fuel-displaced A mouthfuls and is connect with the oil inlet of the solenoid directional control valve, B mouthfuls of oil return with
Hydraulic oil container connects.
5 operation principle of three-way flowrate valve is as follows：The current value that proportional throttle valve 51 is sent out according to controller determines that spool is opened
Open area, after current value fixation, the valve core opening of the valve determines that.The control terminal at 52 spool both ends of pressure-compensated valve
Fluid is taken respectively from the oil inlet and oil outlet of proportional throttle valve 51, and inlet outlet pressure differential and the pressure of such proportional throttle valve 51 are mended
The spring force for repaying valve 52 balances each other, this value is substantially constant.Flow through throttle valve flow only with valve core opening area and
Spool inlet outlet pressure differential is related, and when proportional throttle valve current value is fixed, the flow for flowing through proportional throttle valve 51 is constant.This
Fluid flow of the sample three-way flowrate valve 5 from P mouthfuls of oil inlet to fuel-displaced A mouthfuls of work is also fixed, not by load effect, constant displacement pump 4
The extra fluid provided flows back to fuel tank, and the P mouthfuls of pressure losses to B mouthfuls of oil return of oil inlet are relative to overflow pressure for B mouthfuls by oil return
Power loss is very little.
The specific work process of constant displacement pump variable delivery hydraulic system is as follows in this implementation：Accessory institute is inputted first in instrument 3
Need working flow, constant displacement pump 4 provides fluid for accessory, and during 1 attonity of operation handle, controller 2 exports most to three-way flowrate valve 5
High current, at this time three-way flowrate valve 5 do not work, be equivalent to a channel, the middle position that fluid passes through reversal valve 8 through constant displacement pump 4
Flow back to fuel tank.When 1 total travel of handle operates, controller 2 is according to the accessory workflow magnitude of the input of instrument 3, to three-way flow
It measures valve 5 and exports corresponding current, it is made to export the working flow of accessory needs, while solenoid directional control valve 8 is controlled to commutate, drive accessory
Rotation.Fluid is flowed out through constant displacement pump 4, and P mouthfuls of inflows of oil inlet through three-way flowrate valve 5, flow needed for accessory is through the fuel-displaced A mouthfuls of stream that works
Go out, extra fluid flows back to fuel tank for B mouthfuls through oil return.It is flowed into from the fluid for the fuel-displaced A mouthfuls of outflow that work through check valve 7, then flow into the side of changing
To 8 P mouths, through A mouthfuls or B mouthfuls outflows, then accessory is flowed into, driving accessory rotation.When 1 fine motion of handle is made, from constant displacement pump 4 to three
The flowing of 5 fluid of through-current capacity valve is operated with total travel, and fluid enters P mouthfuls of oil inlet, since 8 spool of solenoid directional control valve does not have standard-sized sheet, stream
The fluid part for entering solenoid directional control valve 8 flows out A mouthfuls or B mouthfuls inflow accessories, realizes that accessory fine motion is made, another part is through reversal valve
Bit stream oil return box in 8.
Claims (1)
1. a kind of constant displacement pump variable delivery hydraulic system, including hydraulic actuating mechanism, the solenoid directional control valve of control hydraulic actuating mechanism, behaviour
Make handle, constant displacement pump, hydraulic oil container；Characterized by further comprising controller, flow input instrument, three-way flowrate valves；The behaviour
The output terminal for making handle and flow input instrument is connected with the corresponding input terminal of the controller, the corresponding output of the controller
End is connect with the Electromagnetic Control end of the three-way flowrate valve and solenoid directional control valve, P mouthfuls of the oil inlet of the three-way flowrate valve with it is described
Constant displacement pump connects, and works fuel-displaced A mouthfuls and is connect with the oil inlet of the solenoid directional control valve, B mouthfuls of oil return is connect with hydraulic oil container；It is described
Three-way flowrate valve is made of proportional throttle valve and pressure-compensated valve, and the pressure-compensated valve is four-way valve, two oil inlet divides
Oil inlet and outlet not with the proportional throttle valve connects, and two oil outlets are connect respectively with work fuel-displaced A mouthfuls and B mouthfuls of oil return, institute
The spring cavity control terminal for stating pressure-compensated valve is connect with the outlet of the proportional throttle valve, another control of the pressure-compensated valve
End is connect with the oil inlet of the proportional throttle valve, and P mouthfuls of oil inlet and the oil inlet of the proportional throttle valve connects, the ratio section
The electromagnetism end of stream valve is connect with controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610548775.1A CN106168234B (en) | 2016-07-13 | 2016-07-13 | A kind of constant displacement pump variable delivery hydraulic system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610548775.1A CN106168234B (en) | 2016-07-13 | 2016-07-13 | A kind of constant displacement pump variable delivery hydraulic system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106168234A CN106168234A (en) | 2016-11-30 |
| CN106168234B true CN106168234B (en) | 2018-06-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610548775.1A Active CN106168234B (en) | 2016-07-13 | 2016-07-13 | A kind of constant displacement pump variable delivery hydraulic system |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106525694B (en) * | 2016-12-27 | 2023-04-14 | 盐城工学院 | An electromagnetic induction type seepage pressure loading device for rock seepage test |
| CN106499682B (en) * | 2016-12-27 | 2018-07-06 | 中交第二航务工程局有限公司 | A kind of hydraulic system for pile driving barge |
| CN109630504B (en) * | 2018-12-26 | 2021-01-26 | 太原理工大学 | Oil inlet and outlet independent control system with pressure compensation function |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5682744A (en) * | 1993-07-26 | 1997-11-04 | Komatsu Ltd. | Directional control valve in a full hydraulic type steering control system |
| CN1496449A (en) * | 2000-08-08 | 2004-05-12 | 胡斯可国际股份有限公司 | Hydraulic control valve system with pressure compensated flow control |
| CN103058071A (en) * | 2012-12-27 | 2013-04-24 | 徐州重型机械有限公司 | Crane, and hydraulic system, control system, and speed control method for superlift rope collection |
| 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 |
| CN104032792A (en) * | 2014-05-28 | 2014-09-10 | 广西柳工机械股份有限公司 | Quantitative and variable hydraulic system of loading machine |
-
2016
- 2016-07-13 CN CN201610548775.1A patent/CN106168234B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5682744A (en) * | 1993-07-26 | 1997-11-04 | Komatsu Ltd. | Directional control valve in a full hydraulic type steering control system |
| CN1496449A (en) * | 2000-08-08 | 2004-05-12 | 胡斯可国际股份有限公司 | Hydraulic control valve system with pressure compensated flow control |
| CN103058071A (en) * | 2012-12-27 | 2013-04-24 | 徐州重型机械有限公司 | Crane, and hydraulic system, control system, and speed control method for superlift rope collection |
| 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 |
| CN104032792A (en) * | 2014-05-28 | 2014-09-10 | 广西柳工机械股份有限公司 | Quantitative and variable hydraulic system of loading machine |
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| Publication number | Publication date |
|---|---|
| CN106168234A (en) | 2016-11-30 |
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