CN106351813B - The inclined disc type electric ratio axial plunger pump of compact and its control method - Google Patents
The inclined disc type electric ratio axial plunger pump of compact and its control method Download PDFInfo
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- CN106351813B CN106351813B CN201610941234.5A CN201610941234A CN106351813B CN 106351813 B CN106351813 B CN 106351813B CN 201610941234 A CN201610941234 A CN 201610941234A CN 106351813 B CN106351813 B CN 106351813B
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- Prior art keywords
- valve
- electric proportional
- swash plate
- pressure
- electric
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/12—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinder axes coaxial with, or parallel or inclined to, main shaft axis
- F04B1/26—Control
Abstract
The invention discloses a kind of inclined disc type electric ratio axial plunger pumps of compact, including electric proportional control valve (1) and the pump housing, electric proportional control valve (1) is connected with proportion electro-magnet (7), the pump housing is connected with swash plate (6), electric proportional control valve (1) setting is equipped with return spring (5) relative to the other side of electric proportional control valve (1) in the side of swash plate (6), in swash plate (6)；Control method is when to the input electrical signal of proportion electro-magnet, feedback force caused by being rotated respectively by the thrust of proportion electro-magnet and swash plate at left and right sides of the electric proportional valve spool of electric proportional control valve, electric proportional valve spool is set to keep a dynamic equilibrium, and swash plate is also at a pivot angle corresponding to electric signal.The present invention can be reduced the overall volume of plunger pump, and compact is strong；There are also whole oil circuits may be provided in pump case, can further decrease volume.
Description
Technical field
The present invention relates to a kind of plate variable plunger pump, the inclined disc type electric ratio axial plunger pump of especially a kind of compact
And its control method.
Background technique
Inclined disc type electricity ratio axial plunger pump is common Hydraulic power units, inputs proportion electro-magnet electric current by changing
Size its discharge capacity can be controlled.At present the existing inclined disc type electric proportional variable plunger pump of engineering machinery generally by
An oil cylinder is respectively set in swash plate both ends, flows into or out two oil cylinders by electric proportional control valve control oil liquid and changes to reach
Become the purpose of swashplate angle.Two conventional oil cylinders are respectively two oil cylinders for pushing swash plate to swing, and two oil cylinders are directly and tiltedly
Disk contact, the length that will cause swash plate two sides entirety become larger, and lead to the increase for pumping overall volume.But for existing engineering
For machinery, the volume of plunger pump is smaller more to facilitate integrally-built layout.But existing inclined disc type electric ratio plunger pump
The distribution form of two oil cylinders, the possibility minimized from ceiling structure plunger pump, the miniaturization for being unfavorable for engineering machinery are wanted
It asks.And conventional electric proportional displacement control pump, control oil circuit needs are mounted on other than the pump housing in the form of oil pipe, are unfavorable for
The installation and transport of engineering machinery.
Summary of the invention
The object of the present invention is to provide a kind of inclined disc type electric ratio axial plunger pump of compact and its control methods.This
Invention can be reduced the overall volume of plunger pump, and compact is strong；There are also whole oil circuits may be provided in pump case, can further decrease
Volume.
Technical solution of the present invention: the inclined disc type electric ratio axial plunger pump of compact, it is characterised in that: including electric ratio control
Valve and the pump housing processed, electric proportional control valve are connected with proportion electro-magnet, and the pump housing is connected with swash plate, and electric proportional control valve is arranged in swash plate
Side, swash plate relative to electric proportional control valve the other side be equipped with return spring.
In the inclined disc type electric ratio axial plunger pump of compact above-mentioned, the electric proportional control valve includes electric proportional valve valve
Set, electric proportional valve valve pocket outer end are equipped with variable cylinder, and the side of electric proportional valve valve pocket is equipped with pressure oil port, oil return opening and into change
Cylinder pressure oil port is measured, electric proportional valve valve sleeving inner wall is equipped with automatically controlled spool step, is equipped with electric proportional valve valve in electric proportional valve valve pocket
Core, electric proportional valve spool is interior to be equipped with the guide rod extended in variable cylinder, electric proportional valve spool inner end and electric ratio through feedback spring
Pressure spring is equipped between example valve valve pocket, variable cylinder end is equipped with steel ball, and steel ball is flexibly connected with swash plate.
In the inclined disc type electric ratio axial plunger pump of compact above-mentioned, pressure cut off is parallel on the electric proportional control valve
Valve, variable cylinder are connect through check valve B with pressure shut-off valve；The oil outlet of the pump housing is also through a pair of oppositely arranged check valve A
External controlled interface is connected with check valve C.
According to the control method of the inclined disc type electric ratio axial plunger pump of compact above-mentioned, when the input for giving proportion electro-magnet
When electric signal, rotated respectively by the thrust of proportion electro-magnet and swash plate at left and right sides of the electric proportional valve spool of electric proportional control valve
Caused feedback force makes electric proportional valve spool keep a dynamic equilibrium, and swash plate is also at a pendulum corresponding to electric signal
Angle.
In the control method of the inclined disc type electric ratio axial plunger pump of compact above-mentioned, when proportion electro-magnet powers off or is lower than
When variable threshold value, the pressure oil of external controlled interface or the pressure oil of oil outlet pass through entering variable cylinder on the right side of automatically controlled spool step,
Under the active force of pressure oil, swash plate is pushed to zero pivot angle, and pump housing output flow is 0 at this time.
In the control method of the inclined disc type electric ratio axial plunger pump of compact above-mentioned, when proportion electro-magnet input current by
Cumulative added-time, automatically controlled spool step right side valve port are closed, and the pressure oil of entering variable cylinder is cut off, meanwhile, automatically controlled spool step
Left side is opened, and the pressure oil in variable cylinder declines the pressure in variable cylinder, swash plate exists by entering oil return on the left of spool step
Under the action of return spring, pivot angle is gradually increased, while the discharge capacity of the pump housing is gradually increased.
In the control method of the inclined disc type electric ratio axial plunger pump of compact above-mentioned, mistake of the swash plate angle in increase
The angular displacement of swash plate is converted to variable cylinder straight-line displacement by steel ball, guide rod by Cheng Zhong, and the power of feedback spring is with straight-line displacement amount
Increase and increase, electric proportional valve core is closed under the action of feedback spring power, on the left of automatically controlled spool step, automatically controlled spool step
Right side is opened, and pressure oil reenters variable cylinder, until new dynamic balance state is established in variable cylinder two sides.
In the control method of the inclined disc type electric ratio axial plunger pump of compact above-mentioned, when the input current of proportion electro-magnet
When being gradually reduced, automatically controlled spool step left and right sides valve port opening and closing is switched, and is closed on the left of automatically controlled spool step, automatically controlled spool
It is opened on the right side of step, high pressure oil passes through entering variable cylinder on the right side of automatically controlled spool step, and the pressure in variable cylinder gradually rises, thus
Compression retracteding position spring keeps swash plate pivot angle gradually smaller, while the discharge capacity pumped is gradually reduced.
In the control method of the inclined disc type electric ratio axial plunger pump of compact above-mentioned, when electric current rising increases discharge capacity
Cause system pressure to rise, pressure cut off is carried out by pressure shut-off valve and realizes self-protection.
In the control method of the inclined disc type electric ratio axial plunger pump of compact above-mentioned, when pressure shut-off valve is not opened,
Check valve B is in close state, and pressure shut-off valve at this time does drainback passage use；After pressure shut-off valve is opened, check valve B
It opens, at this point, electric proportional valve spool is in any position by the function of current, swash plate will all be pushed into 0 pendulum under the action of hydraulic coupling
Pressure cut off is realized at angle.
Compared with prior art, the present invention is reduced on the swaying direction of swash plate by the way that swash plate side is arranged in variable cylinder
Entire length, compared to existing electric proportioning pump, the variable cylinder that the present invention uses, length dimension only has the one of existing structure
Half, when swash plate Integral swinging, required space is just smaller in this way, and control oil circuit is integrated in pump case, so pump
Body can relatively be made smaller, to reduce overall volume.There is no external oil pipe, either transport or installation, all dresses become
It is simpler and easy to operate.And it is controlled using electric proportional control valve, as long as the input current to main pump carries out coding control
System, can make host that the intelligentized control method, it can be achieved that host be adjusted to the discharge capacity under various operating conditions.It is used in the present invention
Number of components, the half of only existing electric proportioning pump, therefore the present invention has the characteristics that strong antijamming capability.
Detailed description of the invention
Fig. 1 is structural schematic diagram of the invention；
Fig. 2 is the structural schematic diagram of electric proportion magnetic valve；
Fig. 3 is the structural schematic diagram of pressure shut-off valve；
Fig. 4 is control principle schematic diagram of the invention.
The label in accompanying drawing is: 1- electric proportional control valve, 2- feedback spring, 3- rotor, 4- plunger, 5- return spring, 6-
Swash plate, 7- proportion electro-magnet, 8- electric proportional valve valve pocket, 9- electric proportional valve spool, 10- pressure spring, 11- guide rod, 12- variable
Cylinder, 13- steel ball, 14- valve body, 15- pressure cut off spool, 16- check valve A, 17- check valve B, 18- check valve C, 101- are automatically controlled
Spool step, P- pressure oil port, A- entering variable cylinder pressure oil port, T- oil return opening.
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 inclined disc type electric ratio axial plunger pump of compact, is constituted as shown in Figure 1, including 1 He of electric proportional control valve
The pump housing, electric proportional control valve 1 are connected with proportion electro-magnet 7, and the pump housing is connected with swash plate 6, and electric proportional control valve 1 is arranged in swash plate 6
Side, swash plate 6 relative to electric proportional control valve 1 the other side be equipped with return spring 5.The pump housing generally comprises rotor 3
With plunger 4.
The electric proportional control valve 1 is constituted as shown in Fig. 2, including electric proportional valve valve pocket 8,8 outer end of electric proportional valve valve pocket
It is equipped with variable cylinder 12, the side of electric proportional valve valve pocket 8 is equipped with pressure oil port P, oil return inlet T and into variable cylinder pressure oil port A, electric
1 inner wall of proportioning valve valve pocket is equipped with automatically controlled spool step 101, is equipped with electric proportional valve spool 9, electric ratio in electric proportional valve valve pocket 1
The guide rod 11 extended in variable cylinder 12,9 inner end of electric proportional valve spool and electric ratio are equipped with through feedback spring 2 in valve core 9
Pressure spring 10 is equipped between valve valve pocket 8,12 end of variable cylinder is equipped with steel ball 13, and steel ball 13 is flexibly connected with swash plate 6.
Pressure shut-off valve is parallel on the electric proportional control valve 1, variable cylinder 12 connects through check valve B17 and pressure shut-off valve
It connects；The oil outlet of the pump housing is also connected with external controlled interface through a pair of oppositely arranged check valve A16 and check valve C18.It is described
Pressure shut-off valve is constituted as shown in figure 3, including valve body 14, valve body 14 is interior to be equipped with pressure cut off spool 15.
Control method of the invention, as shown in figure 4, wherein top is pressure shut-off valve, lower section is electric proportional control valve, S
For inlet port, B is oil outlet, and Y is external controlled interface, and in the initial state, electric proportion magnetic valve left position works the pump housing, pump housing outlet
Oily normal open variable cylinder, so pump is initially at zero delivery.When proportion electro-magnet is powered, electric proportional control valve core 1 is in ratio electricity
Under the action of 7 thrust of magnet, right position is started to work, and the oil circuit of pump housing outlet towards variable cylinder N are truncated at this time, and variable cylinder is connected
Oil return, swash plate 6 change under the action of return spring 5 to zero delivery.Specific Variable Control process is as follows:
In order to keep control of the oil pump capacity when outlet pressure is lower more accurate, external control oil sources need to be introduced, the oil sources was both
The pivot angle of swash plate 6 is controlled, and cannot be logical with outlet oil duct, therefore, has disposed list between outer governor pressure oil and pump discharge oil
Check valve C18 is set to valve A16 and external controlled interface, when external control pressure oil is greater than outlet pressure oil, check valve C18 is opened, single
It is closed to valve A16, it is external control pressure oil that swash plate 6, which controls oil sources,；When outlet pressure oil is greater than external control pressure oil, check valve A16 is beaten
It opens, check valve C18 is closed, and it is pump discharge pressure oil that swash plate 6 at this time, which controls oil sources,.
When proportion electro-magnet 7 powers off or is lower than variable threshold value, external control pressure oil or outlet pressure oil pass through electrically-controlled valve
101 right side entering variable cylinder of core step, under the active force of pressure oil, swash plate 6 is pushed to zero pivot angle, and pump output flow is at this time
0。
When 7 input current of proportion electro-magnet gradually increases, automatically controlled 101 right side valve port of spool step is closed, entering variable
The pressure oil of cylinder 12 is cut off, meanwhile, it is opened on the left of automatically controlled spool step 101, the pressure oil in variable cylinder 12 passes through spool platform
Enter oil return on the left of rank 101, decline the pressure in variable cylinder 12, at this point, swash plate 6 is under the action of return spring 5, pivot angle by
It is cumulative big, correspondingly, the discharge capacity of pump is gradually increased.6 angle of swash plate, will be oblique by steel ball 13, guide rod 11 during increase
The angular displacement of disk 6 is converted to variable cylinder straight-line displacement, and the power of feedback spring 2 increases, electric ratio with the increase of straight-line displacement amount
Spool 9 is closed on the left of automatically controlled spool step 101 under the action of 2 power of feedback spring, is opened on the right side of automatically controlled spool step 101, pressure
Power oil reenters variable cylinder 12, until new dynamic balance state is established in 12 two sides of variable cylinder.
When the input current of proportion electro-magnet 7 is gradually reduced, automatically controlled 101 left and right sides valve port of spool step opening and closing is carried out
Switch, close on the left of automatically controlled spool step 101, opened on the right side of automatically controlled spool step 101, high pressure oil (opposite this system) is by electricity
101 right side entering variable cylinder 12 of spool step is controlled, the pressure in variable cylinder 12 gradually rises, so that compression retracteding position spring 5, makes tiltedly
6 pivot angle of disk is gradually smaller, correspondingly, the discharge capacity of pump is gradually reduced.The size of electric current determines the size of the pivot angle of swash plate 6, electricity
The consecutive variations of stream realize the stepless variation of pumpage.
From zero delivery to maximum pump discharge corresponding electric current section is determined by 2 rigidity of feedback spring, and spring rate
Design is then selected according to the power output of electromagnet 7 and current characteristics, and spring rate is bigger, and output flow is from 0 to the area of set solid amount
Between it is longer, conversely, then shorter.Change rising for range of variables and adjust point, feedback spring 2 can be changed by increasing adjustment gasket and adjusts
The common pretightning force of pressing spring 10 realizes that pretightning force is bigger, and variable starting point is higher, and pretightning force is smaller, variable starting point is got over
It is low.
Cause system pressure to rise when electric current rising increases discharge capacity, pressure cut off is needed to realize self-protection, then,
Pressure shut-off valve of the invention in parallel can be respectively in order to ensure pressure shut-off valve and electric proportional control valve are not interfere with each other at work
From specific function is realized, by disposing check valve B, when pressure shut-off valve is not opened, check valve B is in close state, this
When pressure shut-off valve do drainback passage use；When pressure shut-off valve open after, check valve B open, at this point, no matter electric proportional valve
Core 9 is in any position by the function of current, and swash plate 6 will all be pushed into 0 pivot angle under the action of hydraulic coupling, realizes pressure cut off.
Claims (6)
1. the inclined disc type electric ratio axial plunger pump of compact, it is characterised in that: including electric proportional control valve (1) and the pump housing, electric ratio
Example control valve (1) is connected with proportion electro-magnet (7), and the pump housing is connected with swash plate (6), and electric proportional control valve (1) is arranged in swash plate (6)
Side, swash plate (6) relative to electric proportional control valve (1) the other side be equipped with return spring (5)；
The electric proportional control valve (1) includes electric proportional valve valve pocket (8), and electric proportional valve valve pocket (8) outer end is equipped with variable cylinder
(12), the side of electric proportional valve valve pocket (8) is equipped with pressure oil port (P), oil return opening (T) and into variable cylinder pressure oil port (A), electric ratio
Example valve valve pocket (8) inner wall is equipped with automatically controlled spool step (101), is equipped with electric proportional valve spool (9) in electric proportional valve valve pocket (8),
The guide rod (11) extended in variable cylinder (12), electric proportional valve spool are equipped with through feedback spring (2) in electric proportional valve spool (9)
(9) pressure spring (10) are equipped between inner end and electric proportional valve valve pocket (8), variable cylinder (12) end is equipped with steel ball (13), steel
Ball (13) is flexibly connected with swash plate (6)；
Pressure shut-off valve is parallel on the electric proportional control valve (1), variable cylinder (12) is through check valve B (17) and pressure shut-off valve
Connection；The oil outlet of the pump housing is also connected with external control and connects through a pair of oppositely arranged check valve A (16) and check valve C (18)
Mouthful.
2. the control method of the inclined disc type electric ratio axial plunger pump of compact according to claim 1, it is characterised in that: when
When to proportion electro-magnet input electrical signal, respectively by proportion electro-magnet at left and right sides of the electric proportional valve spool of electric proportional control valve
Thrust and swash plate rotate caused by feedback force, so that electric proportional valve spool is kept a dynamic equilibrium, and swash plate is also at telecommunications
A pivot angle corresponding to number；
When proportion electro-magnet powers off or is lower than variable threshold value, the pressure oil of external controlled interface or the pressure oil of oil outlet are by electricity
Entering variable cylinder on the right side of spool step is controlled, under the active force of pressure oil, swash plate is pushed to zero pivot angle, at this time pump housing output flow
It is zero；
When proportion electro-magnet input current gradually increases, valve port is closed on the right side of automatically controlled spool step, the pressure of entering variable cylinder
Oil is cut off, meanwhile, it is opened on the left of automatically controlled spool step, the pressure oil in variable cylinder on the left of automatically controlled spool step by entering back
Oil declines the pressure in variable cylinder, and under the action of the return spring, pivot angle is gradually increased swash plate, at the same the discharge capacity of the pump housing by
It is cumulative big.
3. the control method of the inclined disc type electric ratio axial plunger pump of compact according to claim 2, it is characterised in that: institute
Swash plate pivot angle is stated during increase, the angular displacement of swash plate is converted to by variable cylinder straight-line displacement by steel ball, guide rod, is fed back
The power of spring increases with the increase of straight-line displacement amount, and electric proportional valve spool is under the action of feedback spring power, automatically controlled spool platform
It closes on the left of rank, is opened on the right side of automatically controlled spool step, pressure oil reenters variable cylinder, until new power is established in variable cylinder two sides
Equilibrium state.
4. the control method of the inclined disc type electric ratio axial plunger pump of compact according to claim 3, it is characterised in that: when
When the input current of proportion electro-magnet is gradually reduced, automatically controlled spool step left and right sides valve port opening and closing is switched, automatically controlled spool
It closes on the left of step, is opened on the right side of automatically controlled spool step, high pressure oil is by entering variable cylinder on the right side of automatically controlled spool step, variable cylinder
In pressure gradually rise, so that compression retracteding position spring, is gradually reduced swash plate pivot angle, while the discharge capacity of the pump housing is gradually reduced.
5. the control method of the inclined disc type electric ratio axial plunger pump of compact according to claim 2, it is characterised in that: when
Electric current rising causes system pressure to rise when increasing discharge capacity, carries out pressure cut off by pressure shut-off valve and realizes self-protection.
6. the control method of the inclined disc type electric ratio axial plunger pump of compact according to claim 5, it is characterised in that: when
When pressure shut-off valve is not opened, check valve B is in close state, and pressure shut-off valve at this time does drainback passage use；Work as pressure
After stop valve is opened, check valve B is opened, at this point, electric proportional valve spool is in any position by the function of current, swash plate all will be in liquid
It is pushed into zero pivot angle under the action of pressure, realizes pressure cut off.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610941234.5A CN106351813B (en) | 2016-10-26 | 2016-10-26 | The inclined disc type electric ratio axial plunger pump of compact and its control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610941234.5A CN106351813B (en) | 2016-10-26 | 2016-10-26 | The inclined disc type electric ratio axial plunger pump of compact and its control method |
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| Publication Number | Publication Date |
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| CN106351813A CN106351813A (en) | 2017-01-25 |
| CN106351813B true CN106351813B (en) | 2019-04-02 |
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| CN110848111B (en) * | 2019-11-27 | 2021-09-10 | 力源液压（苏州）有限公司 | Plunger variable pump integrated control system |
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| CN111005899B (en) * | 2019-12-30 | 2022-06-07 | 徐州重型机械有限公司 | Load-sensitive hydraulic system with controllable oil pump limit displacement, control method and engineering machinery |
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| DE10360452B3 (en) * | 2003-12-22 | 2005-09-08 | Brueninghaus Hydromatik Gmbh | Axial piston machine with fixable sliding block on the swashplate |
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| JPS6463665A (en) * | 1987-09-02 | 1989-03-09 | Tokyo Keiki Kk | Control device for variable displacement pump |
| CN101956686A (en) * | 2010-10-21 | 2011-01-26 | 吴赛珍 | Position-spring-force feedback type electric proportional variable axial plunger pump |
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Application publication date: 20170125 Assignee: Suzhou Liyuan Hydraulic Co.,Ltd. Assignor: AVIC LIYUAN HYDRAULIC Co.,Ltd. Contract record no.: X2023520000016 Denomination of invention: Compact swashplate electric proportional axial piston pump and its control method Granted publication date: 20190402 License type: Exclusive License Record date: 20230625 |