CN106438527A - Flow compensation method and flow compensation device for proportional control pump - Google Patents
Flow compensation method and flow compensation device for proportional control pump Download PDFInfo
- Publication number
- CN106438527A CN106438527A CN201611009378.3A CN201611009378A CN106438527A CN 106438527 A CN106438527 A CN 106438527A CN 201611009378 A CN201611009378 A CN 201611009378A CN 106438527 A CN106438527 A CN 106438527A
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- Prior art keywords
- proportional control
- control valve
- flow
- pressure
- valve
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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
- F15B11/00—Servomotor systems without provision for follow-up action; Circuits therefor
- F15B11/08—Servomotor systems without provision for follow-up action; Circuits therefor with only one servomotor
-
- 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
- F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
- F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
- F15B13/043—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves
- F15B13/0433—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure with electrically-controlled pilot valves the pilot valves being pressure control valves
-
- 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
- F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
- F15B2211/205—Systems with pumps
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Positive-Displacement Pumps (AREA)
- Reciprocating Pumps (AREA)
Abstract
The invention discloses a flow compensation method of a proportional control pump. When outlet pressure of the proportional control pump changes, by carrying out pressure compensation on the valve element end of a proportional control valve, compensation acting force generates a tilting tray angle increment value, and a proportional control pump output flow increment value generated by the tilting tray angle increment value compensates for a flow value lost due to the outlet pressure; a flow compensation device comprises an electric proportional control valve and a main pump provided with an oil absorbing opening and a working oil opening, the variable cylinder small end and the variable cylinder large end of the main pump are connected with the electric proportional control valve, and a pressure compensation valve is arranged at the tail end of the electric proportional control valve. By means of compensation, the influence on flow output by the main pump from pressure change is avoided, the load speed can be controlled stably, and accuracy is ensured.
Description
Technical field
The present invention relates to a kind of ratio controlling pump field, particularly a kind of flow-compensated method of ratio controlling pump and flow
Compensation device.
Background technology
In elevator and rotary machine, for meeting the accurate control to main pump output flow for the main frame, especially main frame execution
It is the remarkable action avoiding instability of flow to cause during action, of crucial importance to main pump output flow stability contorting；Require main pump
During ratio, the flow of any one displacement position output is all by disturbing that load pressure fluctuates, because pump is deposited under stress
In inevitable volumetric efficiency loss and friction pair leakage loss, and also lead to when load pressure is unstable volumetric efficiency loss and
Friction pair leakage is unstable, which results in the unstable of output flow.Due to the unpredictability of load pressure, general ratio control
The structure design of valve processed leads to POF to there is, because of the unpredictability of load pressure, the change being difficult to expect, leads to compare
The control accuracy of example controlling pump plays not out.
Content of the invention
It is an object of the invention to, a kind of flow-compensated method of ratio controlling pump and flow compensation device are provided.This
Bright be not stressed the impact of change by compensating the flow making main pump output, can smoothly control the speed of load it is ensured that essence
Really property.
Technical scheme：The flow-compensated method of ratio controlling pump it is characterised in that：When ratio controls pump discharge
During pressure change, pressure compensation is carried out by the valve element tail end in proportional control valve, the active force of compensation produces a swash plate angle
Degree increment size, the ratio that swash plate angle increment size produces controls POF increment size to make up because of the flow of outlet pressure loss
Value.
In the flow-compensated method of aforesaid ratio controlling pump, pressure is arranged by the valve element tail end in proportional control valve and mends
Repay valve and carry out pressure compensation.
In the flow-compensated method of aforesaid ratio controlling pump, the pressure change of described ratio controlling pump, cause to pressure
The precompressed amount of the counterbalance spring of recuperation valve changes, and the active force that described precompressed amount produces simultaneously acts on the tail of proportional control valve
End, sets up the active force of the thrust, the thrust of control signal generation and counterbalance spring of feedback spring at the two ends of proportional control valve
The equilibrium relation of making a concerted effort being collectively forming, for maintaining the balance of equilibrium relation of making a concerted effort, the swash plate of ratio controlling pump increases a drift angle
So that the precompressed amount of feedback spring changes, thus the precompressed amount that canceling compensation spring changes, finally make going out of ratio controlling pump
Mouth flow is not by disturbing that outlet pressure changes.
In the flow-compensated method of aforesaid ratio controlling pump, described ratio controlling pump is electric proportional control pump or first drain
Control ratio controlling pump.
The flow compensation device of the flow-compensated method according to aforesaid ratio controlling pump, including electric proportional control valve and
There is the main pump of inlet port and actuator port, the big end of the variable cylinder small end of main pump, variable cylinder is connected with electric proportional control valve, described
The tail end of electric proportional control valve is provided with pressure-compensated valve.
In the flow compensation device of aforesaid ratio controlling pump, described electric proportional control valve includes being arranged in electrically-controlled valve body
Electric proportional control valve core, electric proportional control valve core one end is provided with proportion electro-magnet, and middle part is provided with electric proportional control valve valve
Core step, the other end is provided with feedback spring, and feedback spring is connected with feedback rod, shifting block, connection sheet in turn, and connection sheet is connected with tiltedly
Disk.
In the flow compensation device of aforesaid ratio controlling pump, described pressure-compensated valve includes compensating valve body, compensates valve body
Inside it is provided with compensating spool, the center of compensating spool is provided with counterbalance spring and displacement spring, and counterbalance spring is sleeved in displacement spring.
Compared with prior art, the present invention passes through to set in the valve element tail end superposition of electric ratio or guide's hydraulic control proportional control valve
One attached recuperation valve of meter, the pressure change of pump discharge causes the precompressed amount to counterbalance spring to change, this precompressed volume production simultaneously
Raw thrust causes already at flat in the tail end of proportional control valve core, the counterbalance spring thrust variation that pressure change produces
The electric proportional control valve of weighing apparatus state produces new control balance, is controlling valve element two ends to set up feedback spring thrust and is being believed by control
Number thrust producing and counterbalance spring thrust form new equilibrium relation at making a concerted effort of collectively constituting, when control electric current is for fixed value,
The pressure that pump discharge increases causes counterbalance spring precompressed to increase, for maintaining the stress balance at electric proportional control valve element two ends, swash plate
Increase a micro- drift angle so that feedback spring precompressed improves, the precompressed increasing with canceling compensation spring in the inevitable weighing apparatus angle in Yuanping City
Power；According to the outlet pressure characteristic proportional to counterbalance spring thrust, can make rate of discharge not by doing that pump discharge pressure changes
Disturb, therefore can smoothly control the speed of load, greatly improve the export ratio characteristic of pump, when main pump carries out intelligence programming control
When, it is possible to decrease the correction difficulty to main frame precise control for the programming.
Brief description
Fig. 1 is the schematic diagram of the present invention；
Fig. 2 is the structural representation of the present invention；
Fig. 3 is the attachment structure schematic diagram of proportional control valve and pressure-compensated valve.
Being labeled as in accompanying drawing：1- rotor assembly；2- plunger assembly；3- swash plate；4- feedback spring；5- electric proportional control
Valve；6- pressure-compensated valve；7- proportion electro-magnet；3.1- connection sheet；3.2- shifting block；3.3- feedback rod；5.1- electric proportional control valve
Valve element；511- electric proportional control valve core step；6.1- counterbalance spring；6.2- displacement spring；6.3- compensating spool；6.4- compensating
Valve body.
Specific embodiment
The present invention is further illustrated with reference to the accompanying drawings and examples, but be not intended as to the present invention limit according to
According to.
Embodiment.The flow-compensated method of ratio controlling pump it is characterised in that：When ratio controls pump discharge pressure change
When, pressure compensation is carried out by the valve element tail end in proportional control valve, the active force of compensation produces a swash plate angle increment size,
The ratio that swash plate angle increment size produces controls POF increment size to make up because of the flow value of outlet pressure loss.Specifically
Pressure-compensated valve is arranged by the valve element tail end in proportional control valve and carries out pressure compensation；The pressure of described ratio controlling pump becomes
Change, cause the precompressed amount of the counterbalance spring to pressure-compensated valve to change, the active force that described precompressed amount produces simultaneously acts on ratio
The tail end of example control valve, in the thrust that the thrust of feedback spring is set up at the two ends of proportional control valve, control signal produces and compensation
The equilibrium relation with joint efforts that the active force of spring is collectively forming, for maintaining the balance of equilibrium relation of making a concerted effort, the swash plate of ratio controlling pump
Increase a drift angle so that the precompressed amount of feedback spring changes, thus the precompressed amount that canceling compensation spring changes, finally make ratio
The rate of discharge of example controlling pump is not by disturbing that outlet pressure changes.
Described ratio controlling pump is electric proportional control pump or guide's hydraulic control ratio controlling pump.
The flow compensation device of the flow-compensated method according to above-mentioned ratio controlling pump, constitute as Figure 1-3, including
Electric proportional control valve 5 and there is inlet port B and the main pump of actuator port S, the variable cylinder small end M of main pump, variable cylinder big end N with
Electric proportional control valve 5 connects, and the tail end of described electric proportional control valve 5 is provided with pressure-compensated valve 6.Described main pump generally comprises and turns
Sub-component 1 and plunger assembly 2.
Described electric proportional control valve 5 includes the electric proportional control valve core 5.1 being arranged in electrically-controlled valve body, electric proportional control
Valve core 5.1 one end is provided with proportion electro-magnet 7, and middle part is provided with electric proportional control valve core step 511, and the other end is provided with feedback bullet
Spring 4, feedback spring 4 is connected with feedback rod 3.3, shifting block 3.2, connection sheet 3.1 in turn, and connection sheet 3.1 is connected with swash plate 3.
Described pressure-compensated valve 6 includes compensating valve body 6.4, compensates in valve body 6.4 and is provided with compensating spool 6.3, compensating spool
6.3 center is provided with counterbalance spring 6.1 and displacement spring 6.2, and counterbalance spring 6.1 is sleeved in displacement spring 6.2.
The course of work of the present invention：
When outlet is for unloaded pressure, pressure-compensated valve 6 is inoperative, when giving certain current signal value, small end
Variable cylinder M normal open pump discharge, current value passes through electric proportional control valve 5 by the electric proportional control valve of electric proportional control valve core 5.1
Open (left side closing) on the right side of valve element step 511, make to hold greatly pressure oil release in variable cylinder N, swash plate 3 revolves to huge discharge direction
Turn, the rotation of swash plate 3 causes the thrust to feedback spring 4 to improve, and this thrust forces ratio electric proportional control valve core 5.1
The right side of electric proportional control valve core step 511 close (left side is opened), into variable cylinder N of big end, injection pressure oil forces tiltedly
Disk 3 rotates to small displacement direction again, and swash plate 3 relaxes the thrust of feedback spring 4；Therefore electric proportional control valve core 5.1 passes through
So after repetitive control change several times, swash plate is ultimately on the corresponding pivot angle that current signal value is specified and keeps balancing.
In order that oil pump is in the more accurate flow of low discharge capacity section outlet output, the volumetric efficiency that need to cause outlet pressure
Carry out flow loss compensation with leakage loss；Mainly one and pressure are occurred by the pivot angle that pressure-compensated valve 6 controls swash plate 3
Related incremental angle, this incremental angle can overcome the disadvantages that the flow loss causing because of pressure, therefore from the point of view of the rate of discharge of pump, flow
Do not occur because of pressure change changing；Therefore, pump does not occur because of the pressure loss with the output flow curve of curent change
Unstable flow curve change.
No matter why electromagnet input current is worth, and pressure-compensated valve 6 all can experience outlet pressure, and the sensing by this pressure
Acted on electric proportional control valve core 5.1 by counterbalance spring 6.1 and be slightly larger than corresponding to input current so as to occur one
The angle value of swash plate 3, you can compensate the flow loss causing because of pressure；Pressure more big then swash plate 3 incremental angle is bigger, recuperation valve
6 pairs of discharge losses are flow-compensated bigger.
On above-mentioned basis, when electromagnet inputs a certain electric current, electric proportional control valve core step 511 left hand valve
Mouth is closed, and the pressure oil at the big end of entering variable cylinder M is cut off, and meanwhile, electric proportional control valve core step 511 right side is opened, urgent
Make to hold greatly M pressure drop, swash plate 3 two ends force unbalance can be led to, to putting on angular direction rotation, swash plate 3 passes through to connect swash plate 3
The angular displacement of swash plate 3 is changed into straight-line displacement by piece 3.1, shifting block 3.2, feedback rod 3.3, and the elastic force of feedback spring 5 is with straight line position
The increase of shifting amount and increase, the electric proportional control valve core step of electric proportional control valve core 5.1 511 right side is closed, until tiltedly
Disk 3 two ends variable cylinder sets up new dynamic balance state, and now swash plate is in the corresponding angle of current value；If outlet pressure occurs
Change, hydraulic oil directly acts in the difference in areas and displacement spring 6.2 of compensating spool 6.3, according to pressure size compensating spool
6.3 produce different displacements, and it is different extra to electric proportional control valve core 5.1 that this displacement result in counterbalance spring 6.1
Active force, this active force and electromagnet thrust collective effect, in the right-hand member of electric proportional control valve core 5.1, break electric proportional control
The stress balance at valve core two ends, forces swash plate 3 to change original angle value, makes swash plate 3 rotate the compression causing feedback spring 4
Elastic force improves, to overcome the active force of counterbalance spring 6.1 and the thrust of proportion electro-magnet 7, due to proportion electro-magnet input current
Constant, then the active force of counterbalance spring 6.1 can produce an additional swash plate 3 angle step value with pressure correlation；This angle increases
The POF increment size that value produces can make up the flow value losing because of pressure.
Claims (7)
1. ratio controlling pump flow-compensated method it is characterised in that：When ratio control pump discharge pressure change when, by than
The valve element tail end of example control valve carries out pressure compensation, and the active force of compensation produces a swash plate angle increment size, and swash plate angle increases
The ratio that value produces controls POF increment size to make up because of the flow value of outlet pressure loss.
2. ratio controlling pump according to claim 1 flow-compensated method it is characterised in that：By in proportional control valve
Valve element tail end setting pressure-compensated valve carry out pressure compensation.
3. ratio controlling pump according to claim 2 flow-compensated method it is characterised in that：Described ratio controlling pump
Pressure change, causes the precompressed amount of the counterbalance spring to pressure-compensated valve to change, the effect masterpiece that described precompressed amount produces simultaneously
For the tail end of proportional control valve, in the thrust that the thrust of feedback spring is set up at the two ends of proportional control valve, control signal produces
The equilibrium relation of making a concerted effort being collectively forming with the active force of counterbalance spring, for maintaining the balance of equilibrium relation of making a concerted effort, ratio controlling pump
Swash plate increase a drift angle so that feedback spring precompressed amount change, thus canceling compensation spring change precompressed amount, finally
The rate of discharge making ratio controlling pump is not by disturbing that outlet pressure changes.
4. ratio controlling pump according to claim 1 flow-compensated method it is characterised in that：Described ratio controlling pump is
Electric proportional control pump or guide's hydraulic control ratio controlling pump.
5. the flow compensation device of the flow-compensated method of the ratio controlling pump according to any one of claim 1-4, it is special
Levy and be：Including electric proportional control valve (5) and have inlet port (B) and the main pump of actuator port (S), the variable cylinder of main pump is little
End (M), the big end of variable cylinder (N) are connected with electric proportional control valve (5), and the tail end of described electric proportional control valve (5) is provided with pressure and mends
Repay valve (6).
6. ratio controlling pump according to claim 5 flow compensation device it is characterised in that：Described electric proportional control valve
(5) inclusion is arranged on the electric proportional control valve core (5.1) in electrically-controlled valve body, and electric proportional control valve core (5.1) one end is provided with
Proportion electro-magnet (7), middle part is provided with electric proportional control valve core step (511), and the other end is provided with feedback spring (4), feeds back bullet
Spring (4) is connected with feedback rod (3.3), shifting block (3.2), connection sheet (3.1) in turn, and connection sheet (3.1) is connected with swash plate (3).
7. ratio controlling pump according to claim 5 flow compensation device it is characterised in that：Described pressure-compensated valve
(6) include compensating valve body (6.4), compensate in valve body (6.4) and be provided with compensating spool (6.3), the center of compensating spool (6.3) is provided with
Counterbalance spring (6.1) and displacement spring (6.2), counterbalance spring (6.1) is sleeved in displacement spring (6.2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611009378.3A CN106438527B (en) | 2016-11-16 | 2016-11-16 | The flow-compensated method and flow compensation device of ratio control pump |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611009378.3A CN106438527B (en) | 2016-11-16 | 2016-11-16 | The flow-compensated method and flow compensation device of ratio control pump |
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| Publication Number | Publication Date |
|---|---|
| CN106438527A true CN106438527A (en) | 2017-02-22 |
| CN106438527B CN106438527B (en) | 2018-10-16 |
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| CN201611009378.3A Active CN106438527B (en) | 2016-11-16 | 2016-11-16 | The flow-compensated method and flow compensation device of ratio control pump |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107477039A (en) * | 2017-08-14 | 2017-12-15 | 潍柴动力股份有限公司 | Hydraulic system and engineering machinery with flow-compensated function |
| CN108533545A (en) * | 2018-06-29 | 2018-09-14 | 潍柴动力股份有限公司 | Hydraulic variable displacement pump mechanical proportional controller and hydraulic variable displacement pump |
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| CN205478597U (en) * | 2016-01-12 | 2016-08-17 | 潍柴动力股份有限公司 | Sensitive hydraulic pump of load and applied hydraulic system who has sensitive hydraulic pump of load |
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| Publication number | Publication date |
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| CN106438527B (en) | 2018-10-16 |
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Application publication date: 20170222 Assignee: Suzhou Liyuan Hydraulic Co.,Ltd. Assignor: AVIC LIYUAN HYDRAULIC Co.,Ltd. Contract record no.: X2023520000021 Denomination of invention: Flow Compensation Method and Flow Compensation Device of Proportional Control Pump Granted publication date: 20181016 License type: Exclusive License Record date: 20230626 |
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