CN209129842U - A kind of close circuit variable pump control valve - Google Patents
A kind of close circuit variable pump control valve Download PDFInfo
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- CN209129842U CN209129842U CN201822026514.0U CN201822026514U CN209129842U CN 209129842 U CN209129842 U CN 209129842U CN 201822026514 U CN201822026514 U CN 201822026514U CN 209129842 U CN209129842 U CN 209129842U
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- cam pin
- main valve
- variable pump
- valve plug
- control valve
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Abstract
The utility model discloses a kind of close circuit variable pump control valves, it include: application valve body, main valve plug, feedback spring, shift fork, feedback rod, cam pin, the lower end of shift fork and the body of rod of feedback rod are sleeved on cam pin, cam pin is fixed on valve body, radial direction in the middle part of main valve plug is equipped with spool pin, and the two sides of the step surface of main valve plug are equipped with throttling channel.Throttling channel on main valve plug links up the oil circuit of left and right variable cylinder slightly, and variable cylinder or so chamber pressure is equal always and slightly below repairing pump discharge pressure.When main valve plug moves left and right, when so that outlet high pressure oil and variable cylinder oil circuit being linked up, the pressure difference at its valve port both ends is smaller, the active force of oil liquid suffered by main valve plug is smaller, to reduce when control valve is opened due to the excessive caused main valve plug jitter problem of pressure difference, it avoids in variable cylinder and compression shock phenomenon occurs, so that variable bar is swung steadily, finally reduce the concussion of close circuit variable pump output flow.
Description
Technical field
The utility model relates to plunger pump technique field, in particular to a kind of close circuit variable pump control valve.
Background technique
In engineering machinery hydraulic control system, there is closed type hydraulic system system to respond fast, integrated high and less energy consumption
The advantages that, therefore be widely used in various engineering machinery.Heart of the close circuit variable pump as closed type hydraulic system, stream
The precision and stability of amount control directly determines the superiority and inferiority of hydraulic system, for close circuit variable pump, control mechanism
Stability be determine close circuit variable pump output flow stability key index.
For existing control mechanism, since repairing pump discharge oil circuit and control oil circuit pressure difference are excessive, when valve port is opened
Control valve core will appear violent shake, and there is larger plays in variable for feedback rod and fork in addition, mutual between them
Coupling will lead to the high vibration of entire control mechanism again, so that close circuit variable pump output flow in variable
There is violent concussion, parameter needed for close circuit variable pump output flow and host mismatches, and executing agency is easy to cause to go out
Existing malfunction, even occurs safety accident when serious.
Therefore, the control precision and stability of close circuit variable pump output flow how are improved, and then improves entire liquid
The performance of pressure system, is a technical problem that technical personnel in the field need to solve at present.
Utility model content
In view of this, can be effectively improved the purpose of the utility model is to provide a kind of close circuit variable pump control valve
Close circuit variable pump controls precision and stability.
To achieve the above object, the utility model provides the following technical solutions:
A kind of close circuit variable pump control valve, comprising: application valve body, main valve plug, feedback spring, shift fork, feedback rod, partially
The body of rod of heart pin, the lower end of the shift fork and the feedback rod is sleeved on the cam pin, and the cam pin is fixed on described
On valve body, the radial direction in the middle part of the main valve plug is equipped with spool pin, and the two sides of the step surface of the main valve plug are equipped with throttling channel,
The shift fork includes left connecting rod and right connecting rod, and the end of the spool pin is between the left connecting rod and the right connecting rod, institute
The upper end for stating feedback rod is equipped with finger, and the end of the finger is between the left connecting rod and the right connecting rod, the left company
Bar is connected with the end of the right connecting rod by the feedback spring.
Preferably, the throttling channel of the two sides of the step surface of the main valve plug is located on the inside of the step surface in 180 ° of arrangements
Throttling channel area of passage be greater than outside throttling channel area of passage.
Preferably, the radial direction of the cam pin tail portion is equipped with positive stop lug boss, and the application valve body is equipped with for holding
It receives the stepped hole of the positive stop lug boss, is additionally provided on the application valve body and the positive stop lug boss is pressed in the stepped hole
Fastener.
Preferably, the fastener includes lock-screw and gasket, the axis phase of the lock-screw and the cam pin
Mutually parallel, the gasket is pressed on the positive stop lug boss by the lock-screw.
Preferably, the cam pin head threads are connected on the inner sidewall of the application valve body.
Preferably, section of the cam pin tail portion on the inside of the positive stop lug boss and application valve body sealing connect
It connects.
Preferably, the side wall of section of the cam pin tail portion on the inside of the positive stop lug boss is equipped with close for placing
The seal groove of seal.
Preferably, the cam pin is equipped with the shaft shoulder for limiting the feedback rod axial movement.
Compared with prior art, above-mentioned technical proposal has the advantage that
A kind of close circuit variable pump control valve provided by the utility model, comprising: application valve body, main valve plug, feedback
Spring, shift fork, feedback rod, cam pin, the lower end of shift fork and the body of rod of feedback rod are sleeved on cam pin, and cam pin is fixed on valve
On body, the radial direction in the middle part of main valve plug is equipped with spool pin, and the two sides of the step surface of main valve plug are equipped with throttling channel, and shift fork includes a left side
Connecting rod and right connecting rod, between left connecting rod and right connecting rod, the upper end of feedback rod is equipped with finger, the end of finger for the end of spool pin
Between left connecting rod and right connecting rod, left connecting rod is connected with the end of right connecting rod by feedback spring at end.Throttling on main valve plug
Slot links up the oil circuit of left and right variable cylinder slightly, and variable cylinder or so chamber pressure is equal always and slightly below repairing pump discharge pressure
Power, when main valve plug moves left and right, when so that outlet high pressure oil and variable cylinder oil circuit being linked up, the pressure difference at valve port both ends is smaller, main
The active force of oil liquid suffered by spool is smaller, to reduce when control valve is opened since the excessive caused main valve plug shake of pressure difference is asked
Topic, avoids in variable cylinder and compression shock phenomenon occurs, so that variable bar is swung steadily, finally reduces close circuit variable pump
The concussion of output flow.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is the embodiments of the present invention, for those of ordinary skill in the art, without creative efforts, also
Other attached drawings can be obtained according to the attached drawing of offer.
Fig. 1 is a kind of using close circuit variable pump control valve provided by a kind of specific embodiment of the utility model
Control principle drawing；
Fig. 2 cuts open for a kind of master of close circuit variable pump control valve provided by a kind of specific embodiment of the utility model
Structural schematic diagram；
Fig. 3 is a kind of main valve of close circuit variable pump control valve provided by a kind of specific embodiment of the utility model
The structural schematic diagram of core；
Fig. 4 cuts open for a kind of side of close circuit variable pump control valve provided by a kind of specific embodiment of the utility model
Structural schematic diagram；
Fig. 5 is to improve front and back close circuit variable pump output flow curve graph.
Appended drawing reference is as follows:
1 is close circuit variable pump, and 2 be variable bar, and 3 be variable bar, and 4 be left end electromagnet, and 5 be control valve, and 6 be right end
Electromagnet, 7 be feedback rod, and 8 be application valve body, and 9 be feedback spring, and 10 be thimble, and 11 be main valve plug, and 12 be cam pin, and 13 are
Spool pin, 14 be shift fork, and 15 be finger, and 16 be throttling channel, and 17 be lock-screw, and 18 be gasket.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describe, it is clear that the described embodiments are only a part of the embodiments of the utility model, rather than whole
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are without making creative work
Every other embodiment obtained, fall within the protection scope of the utility model.
Fig. 1-Fig. 4 is please referred to, Fig. 1 is a kind of application enclosed variable provided by a kind of specific embodiment of the utility model
The control principle drawing of plunger pump control valve；Fig. 2 is a kind of enclosed variable provided by a kind of specific embodiment of the utility model
The master of plunger pump control valve cuts open structural schematic diagram；Fig. 3 is a kind of enclosed provided by a kind of specific embodiment of the utility model
The structural schematic diagram of the main valve plug of variable piston pump control valve；Fig. 4 is provided by a kind of specific embodiment of the utility model
Structural schematic diagram is cutd open in a kind of side of close circuit variable pump control valve.
A kind of close circuit variable pump control valve provided by the utility model embodiment, comprising: application valve body 8, main valve
Core 11, feedback spring 9, shift fork 14, feedback rod 7, cam pin 12, the lower end of shift fork 14 and the body of rod of feedback rod 7 are sleeved on bias
On pin 12, cam pin 12 is fixed on valve body, and cam pin 12 primarily serves the effect that support shift fork 14 and feedback rod 7 rotate, main
The radial direction at 11 middle part of spool is equipped with spool pin 13, and the two sides of the step surface of main valve plug 11 are equipped with throttling channel 16, and shift fork 14 wraps
Left connecting rod and right connecting rod are included, the end of spool pin 13 is between left connecting rod and right connecting rod, when main valve plug 11 moves axially, valve
Core pin 13 primarily serves the effect for driving left connecting rod or right connecting rod to rotate around cam pin 12, and the upper end of feedback rod 7 is equipped with finger 15,
The end of finger 15 can drive left connecting rod or the right side by finger 15 when feedback rod 7 rotates between left connecting rod and right connecting rod
The end of link rotatable, left connecting rod and right connecting rod is connected by feedback spring 9.
Specifically this control valve 5 opens sliding valve structure using 3-position 4-way non-complete cycle, and the upper end oil circuit is respectively turned on slippage pump
Outlet oil circuit and fuel tank, lower end oil circuit link up 3 left and right sides cavity of variable cylinder respectively, and variable bar 2 is in 3 or so cavity pressure of variable cylinder
It is moved under the action of power difference, and then changes the output flow of close circuit variable pump 1, the displacement signal with variations per hour bar 2 passes through
Feedback rod 7 feeds back to control valve 5, so as to adjust the position of the main valve plug 11 of control valve 5, and then realizes entire enclosed variable piston
Pump the closed-loop control of 1 output flow.
When control valve 5 is in middle position, sliding valve structure is opened since main valve plug 11 uses non-complete cycle, the section on main valve plug 11
Chute 16 links up the oil circuit of left and right variable cylinder 3 slightly, and 3 or so chamber pressure of variable cylinder is equal always and slightly below slippage pump
Outlet pressure, variable bar 2 are in middle position, and variable pump is in zero displacement position.When left end electromagnet 4 or right end electromagnet 6 receive
When control signal pushes the main valve plug 11 of control valve 5 to move left and right, when so that outlet high pressure oil and 3 oil circuit of variable cylinder being linked up,
The pressure difference at valve port both ends is smaller, and the active force of oil liquid suffered by main valve plug 11 is smaller, to reduce when control valve 5 is opened due to pressure
11 jitter problem of main valve plug, avoids and occurs compression shock phenomenon in variable cylinder 3 caused by difference is excessive, so that variable bar 2 is swung
Steadily, the concussion of 1 output flow of close circuit variable pump is finally reduced.
Specifically, control valve 5 uses bilateral symmetry, and left end electromagnet 4 and right end electromagnet 6 are located at control valve
5 left and right ends are connect by thimble 10 with main valve plug 11 respectively.When system variable, left end electromagnet 4 receives control signal
Push thimble 10 mobile, so that main valve plug 11 be driven to move right, 3 left end of variable cylinder and slippage pump oil outlet are linked up, right end with
Fuel tank is linked up, and variable bar 2 moves right under the action of pressure difference, so that 1 swash plate of close circuit variable pump be pushed to turn to clockwise
Dynamic, output flow starts to change, while main valve plug 11 moves right and moves right with movable valve plug pin 13, to drive shift fork 14
Right connecting rod is mobile, and feedback spring 9 is started to extend, is connected at this time due to variable bar 2 with feedback rod 7, so that feedback rod 7 drives finger
The left connecting rod of 15 promotion shift forks 14 is moved to the left, and stretches feedback spring 9 into one, when feedback spring 9 passes through shift fork 14 to main valve plug
When 11 active force and the active force of left end electromagnet 4 reach balance, main valve plug 11 returns to middle position, 3 or so cavity pressure of variable cylinder
Equal, 1 output flow of close circuit variable pump maintains under a certain setting flow, and main valve plug 11 is in dynamic equilibrium shape at this time
State, valve port are not at completely closed state, but in continuous open and close state, therefore use non-complete cycle valve opening
Cored structure can greatly reduce the pressure difference at valve port both ends, so as to avoid main valve plug 11 due to valve in beginning and closing process
Violent jitter phenomenon caused by mouth both ends pressure difference is excessive.
As shown in figure 5, when solenoid valve receives control signal and pushes main valve plug 11 mobile, close circuit variable pump 1
Variation takes place in output flow.There is obviously 1 flow curve of close circuit variable pump in ramp-up period and fall stage before improving
Pause and reforming phenomena, this is mainly due to valve port unlatching when, main valve plug 11 occur acutely shake caused by enclosed variable
The fluctuation of 1 rate of discharge of plunger pump, has seriously affected the precision and stability of hydraulic system.After transformation, output flow curve
More gentle in stage shy with strangers and fall stage, the precision and stability of control are greatly improved, and then improve entire
The performance of hydraulic system.
Specifically, the throttling channel 16 of the two sides of the step surface of main valve plug 11 is in 180 ° of arrangements, the i.e. throttling channels 16 of two sides
The axis of line and main valve plug 11 is parallel to each other, and the area of passage of the throttling channel 16 on the inside of step surface is greater than the throttling in outside
The area of passage of slot 16.Itself leakage rate for reducing oil liquid while primarily to increasing stability, there is the tool of joint flow slot 16
Body structure needs are designed according to control valve 5 and variable pump dependency structure parameter, excessive or too small will lead to flow curve
Different degrees of offset occurs.
In order to improve the mounting stability of cam pin 12, the radial direction of 12 tail portion of cam pin is equipped with positive stop lug boss, control
Valve body 8 is equipped with the stepped hole for accommodating positive stop lug boss, is additionally provided on application valve body 8 and positive stop lug boss is pressed in stepped hole
Fastener.After adjusting feedback rod 7 to suitable position by cam pin 12, cam pin 12 can be fixed on control by fastener
On valve body 8, prevent it from rotating in variable and feedback signal is caused deviation occur.Cam pin 12 and the connection of application valve body 8 are
Shaft hole matching connection can reduce main valve plug 11 and shake the radial-play of caused cam pin 12 and shift fork 14, and can increase master
The stability of spool 11, and then control precision and stability is improved, so that parameter needed for the output flow matching system of variable pump.
Specifically, fastener includes lock-screw 17 and gasket 18, and the axis of lock-screw 17 and cam pin 12 is mutually flat
Row, gasket 18 are pressed on positive stop lug boss by lock-screw 17.Cam pin 12 can be limited by gasket 18 and carry out axial direction
It is mobile.
Specifically, 12 head threads of cam pin are connected on the inner sidewall of application valve body 8.I.e. 12 head of cam pin passes through control
The side wall of 8 side of valve body processed and then sequentially pass through shift fork 14 and feedback rod 7 is threadedly secured on application valve body 8, wherein
The convenience of the installation of cam pin 12 is improved by screw thread.
Further, section of 12 tail portion of cam pin on the inside of positive stop lug boss and application valve body 8 are tightly connected.By close
Envelope connection can be improved the being completely embedded property of cam pin 12 and application valve body 8, and then improve the mounting stability of cam pin 12.
Specifically, the side wall of section of 12 tail portion of cam pin on the inside of positive stop lug boss is equipped with for placing sealing ring
Seal groove.
In order to be better protected from the case where feedback rod 7 generates play, cam pin 12 is equipped with axial for limit feedback bar 7
The mobile shaft shoulder.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with other
The difference of embodiment, the same or similar parts in each embodiment may refer to each other.
A kind of close circuit variable pump control valve provided by the utility model is described in detail above.Herein
Specific case is applied to be expounded the principles of the present invention and embodiment, the explanation of above example is only intended to
Help understands the method and its core concept of the utility model.It should be pointed out that coming for those skilled in the art
It says, without departing from the principle of this utility model, several improvements and modifications can be made to this utility model, these change
Into in the protection scope for also falling into the utility model claims with modification.
Claims (8)
1. a kind of close circuit variable pump control valve characterized by comprising application valve body, main valve plug, feedback spring, shift fork,
The body of rod of feedback rod, cam pin, the lower end of the shift fork and the feedback rod is sleeved on the cam pin, and the cam pin is solid
It is scheduled on the valve body, the radial direction in the middle part of the main valve plug is equipped with spool pin, and the two sides of the step surface of the main valve plug are set
There is throttling channel, the shift fork includes left connecting rod and right connecting rod, and the end of the spool pin is located at the left connecting rod and the right company
Between bar, the upper end of the feedback rod is equipped with finger, the end of the finger between the left connecting rod and the right connecting rod,
The left connecting rod is connected with the end of the right connecting rod by the feedback spring.
2. close circuit variable pump control valve according to claim 1, which is characterized in that the step surface of the main valve plug
For the throttling channel of two sides in 180 ° of arrangements, the area of passage of the throttling channel on the inside of the step surface is greater than the throttling channel in outside
Area of passage.
3. close circuit variable pump control valve according to claim 1, which is characterized in that the radial direction of the cam pin tail portion
Direction is equipped with positive stop lug boss, and the application valve body is equipped with the stepped hole for accommodating the positive stop lug boss, the application valve body
On be additionally provided with the fastener being pressed on the positive stop lug boss in the stepped hole.
4. close circuit variable pump control valve according to claim 3, which is characterized in that the fastener includes locking screw
The axis of nail and gasket, the lock-screw and the cam pin is parallel to each other, and the gasket is compressed by the lock-screw
On the positive stop lug boss.
5. close circuit variable pump control valve according to claim 4, which is characterized in that the cam pin head threads connect
It connects on the inner sidewall of the application valve body.
6. close circuit variable pump control valve according to claim 5, which is characterized in that the cam pin tail portion is close to institute
Section and the application valve body on the inside of positive stop lug boss is stated to be tightly connected.
7. close circuit variable pump control valve according to claim 6, which is characterized in that the cam pin tail portion is close to institute
The side wall of the section on the inside of positive stop lug boss is stated equipped with the seal groove for placing sealing ring.
8. close circuit variable pump control valve according to claim 7, which is characterized in that the cam pin is equipped with and is used for
Limit the shaft shoulder of the feedback rod axial movement.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822026514.0U CN209129842U (en) | 2018-12-04 | 2018-12-04 | A kind of close circuit variable pump control valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822026514.0U CN209129842U (en) | 2018-12-04 | 2018-12-04 | A kind of close circuit variable pump control valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209129842U true CN209129842U (en) | 2019-07-19 |
Family
ID=67248039
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822026514.0U Active CN209129842U (en) | 2018-12-04 | 2018-12-04 | A kind of close circuit variable pump control valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209129842U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109340101A (en) * | 2018-12-04 | 2019-02-15 | 力源液压（苏州）有限公司 | A kind of close circuit variable pump control valve |
-
2018
- 2018-12-04 CN CN201822026514.0U patent/CN209129842U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109340101A (en) * | 2018-12-04 | 2019-02-15 | 力源液压（苏州）有限公司 | A kind of close circuit variable pump control valve |
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