CN206988194U - A kind of flow prior control loop - Google Patents
A kind of flow prior control loop Download PDFInfo
- Publication number
- CN206988194U CN206988194U CN201720776773.8U CN201720776773U CN206988194U CN 206988194 U CN206988194 U CN 206988194U CN 201720776773 U CN201720776773 U CN 201720776773U CN 206988194 U CN206988194 U CN 206988194U
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- Prior art keywords
- pressure
- valve
- oil
- control
- oil inlet
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Abstract
It the utility model is related to a kind of flow prior control loop,The control loop has oil inlet,First working hole and the second working hole,That is connected on the oil circuit between oil inlet and the first working hole is provided with adjustable throttling,Pressure-compensated valve,Two control ports of the spring cavity of pressure-compensated valve and non-spring cavity are respectively communicated with the oil inlet and oil-out of adjustable throttling,Pressure-control valve is provided with oil circuit between oil inlet and the second working hole,The valve port opening of pressure-control valve is associated with the oil pressure of the first working hole and oil inlet,Oil inlet oil pressure makes the valve port opening of pressure-control valve be in increase tendency,The oil pressure of first working hole makes the valve port opening of pressure-control valve be in reduction trend,So as to make the pressure oil fed by oil inlet preferentially be supplied to the first actuator port,The control loop can be preferentially to one working hole fuel feeding,Also it is avoided that its flow is influenceed by load change simultaneously,Realize the accurate control of pressure-gradient control valve.
Description
Technical field
A kind of hydraulic control circuit is the utility model is related to, relates in particular to a kind of flow prior control loop.
Background technology
In Hydraulic Power Transmission System, usually liquid is selected according to the requirement that maximum speed is disclosure satisfy that under highest loading condition
The discharge capacity of press pump, and consider cost, uses constant displacement pump, and in fact, engineering machinery is run in maximum speed, because
The oil of this actually hydraulic pump is not fully utilized, and action is slower, and oil wastes more, and energy loss is bigger, and its consequence is just
It is energy consumption increase, system oil temperature rise is usually same using a Hydraulic power units (hydraulic pump) to solve the problems, such as high energy consumption
When to multiple loads provide hydraulic oil, to drive different functional parts to act simultaneously, for such Hydraulic Power Transmission System, by
It is interconnected in difference in functionality component system, flow can change due to the fluctuation of load, so as to cause component working unstable, sternly
Ghost image rings element service life and unfailing performance,.In addition, when the output flow of hydraulic pump is less than the stream needed for all functional parts
When measuring sum, then it be able to can not be operating normally due to the underfed of supply portion critical component, component actuation order is uncontrollable,
Inaccurate coordination, have a strong impact on equipment availability.
In order to overcome above mentioned problem, frequently with following scheme：
1st, using the hydraulic pump of big flow, its flow is made to disclosure satisfy that the loaded demand of institute；
2nd, one fixed throttle port is accessed into non-preferential oil circuit when making composite move, limits the flow into entry loop, so as to
Reach the ability for limiting non-preferential component actuation；
3rd, when making composite move, the stroke of main valve plug is turned round in limitation, reaches limitation into the purpose of rotary motor flow；
The 4th, flow pressure-gradient control valve is set.
The 1st kind of method of the above cause cost increase, complicated, the 2nd, the access of 3 kind of method be all fixed throttle port, no
It can be adjusted according to the difference of part-load, poor to different adaptability for working condition, the 4th kind of method can be preferentially to one work
Confession oil, its flow is avoided to be influenceed by load change.A kind of flow pressure-gradient control valve as disclosed in patent CN201410452110.1
Device, has oil inlet, the first working hole and the second working hole, and the oil inlet is communicated in first working hole, it is described enter
Pressure-control valve, the valve port opening association of the pressure-control valve are provided with oil circuit between hydraulic fluid port and second working hole
In the oil pressure of first working hole, the oil pressure of first working hole makes the valve port opening of the pressure-control valve become in reduction
Gesture, so that the pressure oil fed by the oil inlet can be made preferentially to be supplied to first actuator port.It is mentioned in patent
Flow pressure-gradient control valve in the valve port opening of pressure-control valve be associated with the oil pressure of first working hole, to be pressurized force control valve
Pressure difference between two control oil circuits and it is easy to that constant flow rate is provided and set on oil circuit between oil inlet P and the first working hole A
Flow control valve is put, but the tool that oil liquid pressure loses is fed back to caused by the stable mode of feedback pressure and flow control valve
Body solution does not provide, and is not given to consider in system yet, and it cannot be guaranteed the control stability of flow pressure-gradient control valve,
So as to it is difficult to ensure that the accuracy of component actuation.
Utility model content
For above-mentioned problem, the utility model provides a kind of flow prior control loop, the control loop energy
Enough preferentially to one working hole fuel feeding, while also it is avoided that its flow is influenceed by load change, realizes the accurate of pressure-gradient control valve
Control.
A kind of flow prior control loop, the control loop has oil inlet, the first working hole and the second working hole, described
That is connected on the oil circuit between oil inlet and the first working hole is provided with adjustable throttling, pressure-compensated valve, the pressure compensation
Two control ports of the spring cavity of valve and non-spring cavity are respectively communicated with the oil inlet and oil-out of the adjustable throttling, it is described enter
Pressure-control valve, the valve port opening association of the pressure-control valve are provided with oil circuit between hydraulic fluid port and second working hole
In first working hole and the oil pressure of the oil inlet, the oil inlet oil pressure makes the valve port opening of the pressure-control valve be in
Increase tendency, the oil pressure of first working hole makes the valve port opening of the pressure-control valve be in reduction trend, so as to make
The pressure oil fed by the oil inlet preferentially supplies to first actuator port.
Above-mentioned technical scheme, because the valve port opening of pressure-control valve is associated with the oil pressure and oil inlet of the first working hole
Oil pressure, the valve port opening of adjustable throttling control the uninterrupted of the first working oil path, and pressure-compensated valve can compensate for choke valve and open
Pressure change caused by mouth change and load change, the pressure difference between the oil inlet oil pressure and oil-out oil pressure of adjustable throttling are
One stationary value, from regardless of whether the magnitude relationship for the load that the load that the first working hole is connected is connected with the second working hole such as
What, can all be such that the hydraulic oil from oil inlet input is preferentially supplied with stable flow to the first working hole, meet first with preferential
The traffic demand for the load that working hole is connected；Only after flow meets the needs of adjustable throttling setting, Stress control
The control port pressure differential of valve two can just open its valve port, and the unnecessary hydraulic oil of hydraulic pump output is supplied to the second working hole.
In one of the embodiments, the compensation pressure of the pressure-compensated valve setting is less than setting for the pressure-control valve
Level pressure force value.
In one of the embodiments, the setting being sequentially connected in series on the oil circuit between the oil inlet and the first working hole can
Flow regulating valve, pressure-compensated valve.
In one of the embodiments, the setting pressure being sequentially connected in series on the oil circuit between the oil inlet and the first working hole
Force compensating valve, adjustable throttling.
In one of the embodiments, in addition to guide liquid control change valve, the work oil-feed of the guide liquid control change valve
Mouth and hydraulic control mouth of the oil-out respectively with first actuator port and the non-spring terminal of the pressure-control valve connect, the guide
Two control ports of pilot operated directional control valve connect with the oil inlet and oil-out of the adjustable throttling respectively, the pressure-compensated valve
It is less than the conducting pressure of pressure-control valve setting with the compensation pressure and commutation pressure of guide liquid control change valve setting.
A kind of flow prior control loop, the control loop has oil inlet, the first working hole and the second working hole, described
The setting adjustable throttling and closed type pressure-compensated valve being sequentially connected in series on oil circuit between oil inlet and the first working hole, it is described
Two control ports of the spring cavity of closed type pressure-compensated valve and non-spring cavity are respectively communicated with the oil-out of the adjustable throttling
With the second actuator port, two control ports of the spring cavity of the pressure-control valve and non-spring cavity are respectively communicated with described can adjust
Flow the oil inlet and oil-out of valve.
Beneficial effect is acquired by the utility model：The compensation pressure of pressure-compensated valve setting in the utility model is less than
The set pressure value of pressure-control valve, therefore pressure-compensated valve ensures preferential and can determined all the time prior to Stress control valve events
Flow to the first working hole pressure oil output.When oil inlet flow is less than setting bypass flow, the first working hole and oil-feed
Pressure difference between mouthful is smaller, is not enough to turn on pressure-control valve, the oil inlet and oil-out pressure differential of choke valve are mended more than pressure
The compensation pressure of valve setting is repaid, what pressure-compensated valve made adjustable throttling is essentially a constant, all liquid into and out of hydraulic fluid port pressure differential
Force feed is with the stable working hole of flux and flow direction first, the preferential traffic demand for meeting the first working hole；When oil inlet flow is more than
When setting bypass flow, choke pressure drop makes the pressure differential between the first working hole and oil inlet reach what is set up on pressure-control valve
Pressure, pressure-control valve conducting are turned on, pressure-compensated valve makes the oil inlet and outlet pressure differential of adjustable throttling be essentially a constant, mended
Repay the influence of the first working hole and the second working hole fluctuation of load to adjustable throttling set flow, it is ensured that carry to the first working hole
For constant flow, the hydraulic oil more than setting bypass flow flows to the second working hole through pressure-control valve, saves energy, even
The frequency of use of pump can be reduced, the service life of pump is extended, reduces cost.
Brief description of the drawings
Fig. 1 is the flow chart of one embodiment of the present utility model；
Fig. 2 is the flow chart of second embodiment of the present utility model；
Fig. 3 is the flow chart of the 3rd embodiment of the present utility model；
Fig. 4 is the flow chart of the 4th embodiment of the present utility model.
Embodiment
First embodiment as shown in Figure 1, a kind of flow prior control loop, the control loop have oil inlet P, first
Working hole A and the second working hole B, what is be sequentially connected in series on the oil circuit between oil inlet P and the first working hole A is provided with adjustable throttling
Two control ports of valve 1, pressure-compensated valve 2, the spring cavity of pressure-compensated valve 2 and non-spring cavity are respectively communicated with adjustable throttling 1
Oil inlet and oil-out, be provided with pressure-control valve 3, pressure-control valve on the oil circuit between oil inlet P and the second working hole B
3 valve port opening is associated with the first working hole A and the oil pressure of oil inlet P, and oil inlet P oil pressure opens the valve port of pressure-control valve 3
Degree is in increase tendency, and the first working hole A oil pressure makes the valve port opening of pressure-control valve 3 be in reduction trend, so as to make to lead to
The pressure oil for crossing oil inlet P infeed preferentially supplies to the first actuator port A.
Specifically, the compensation pressure that pressure-compensated valve 2 is set is less than the setup pressure value of pressure-control valve 3.
The operation principle of the present embodiment is：When oil-feed P mouths oil inlet quantity be not more than adjustable throttling 1 set bypass flow,
The standard-sized sheet of pressure-compensated valve 2, pressure-control valve 3 are in cut-off working position, the first working hole A oil inlet flow, not become by load
Changing influences；When oil-feed P mouths oil inlet quantity is more than the bypass flow of the setting of adjustable throttling 1, choke pressure drop makes entering for adjustable throttling 1
Hydraulic fluid port and oil-out pressure differential are more than the compensation pressure that pressure-compensated valve 2 is set, while between the first working hole A and oil inlet P
Pressure differential also greater than set pressure value on pressure-control valve 3 when, pressure-control valve 3 is on working position, pressure compensation
Valve 2 makes the oil inlet and outlet pressure differential of adjustable throttling 1 be essentially a constant, eliminates the first working hole A and the second working hole B is born
The dynamic influence to the set flow of adjustable throttling 1 of carrier wave, it is ensured that constant flow, excess traffic warp are provided to the first working hole A
Pressure-control valve 3 enters the second working hole B.
Second embodiment as shown in Figure 2, including adjustable throttling 1, normally closed pressure-compensated valve 2 and pressure-control valve 3, tool
There are oil inlet P, the first working hole A and the second working hole B, the setting that adjustable throttling 1, normally closed pressure-compensated valve 2 are sequentially connected in series
Between oil inlet P and the first working hole A, pressure-control valve 3 is arranged between oil inlet P and the second working hole B.Adjustable throttling
The reversed control mouth for being fed to pressure-control valve 3 of oil-pressure direct after valve 1, the second working hole B oil pressure feed back to pressure-compensated valve 2
Control mouth.
The operation principle of the present embodiment is：When oil-feed P mouths oil inlet quantity be not more than adjustable throttling 1 set bypass flow,
The standard-sized sheet of pressure-compensated valve 2, pressure-control valve 3 are in cut-off working position, the first working hole A oil inlet flow, not become by load
Changing influences；When oil-feed P mouths oil inlet quantity is more than the bypass flow of the setting of adjustable throttling 1, choke pressure drop makes entering for adjustable throttling 1
Hydraulic fluid port and oil-out pressure differential are more than the compensation pressure that pressure-compensated valve 2 is set, while between the first working hole A and oil inlet P
Pressure differential also greater than set pressure value on pressure-control valve 3 when, pressure-control valve 3 is on working position, unnecessary stream
Amount output is to the second working hole B, and when the second working hole B pressure is less than the first working hole A pressure, pressure-compensated valve 2 is complete
Open, pressure-control valve 3 makes the pressure difference before and after choke valve be a constant, it is ensured that constant flow is provided to the first working hole A, when the
When two working hole B pressure is higher than the first working hole A pressure, for the second working hole B pressure feedbacks to pressure-compensated valve 2, making can
Pressure after flow regulating valve 1 is equal to the second working hole B pressure, so as to which the input flow rate of oil inlet P is pressed into adjustable throttling 1
The pro rate of aperture and the full gate of pressure-control valve 3.
3rd embodiment as shown in Figure 3, including adjustable throttling 1, pressure-compensated valve 2 and pressure-control valve 3, have into
Hydraulic fluid port P, the first working hole A and the second working hole B, what pressure-compensated valve 2, adjustable throttling 1 were sequentially connected in series is arranged at oil inlet P
And first between working hole A, pressure-control valve 3 is arranged between oil inlet P and the second working hole B, the first working hole A oil pressure
Directly feed back to the control mouth of pressure-compensated valve 2 and pressure-control valve 3.
The operation principle of the present embodiment is：When oil-feed P mouths oil inlet quantity be not more than adjustable throttling 1 set bypass flow,
The standard-sized sheet of pressure-compensated valve 2, pressure-control valve processing cut-off working position, the first working hole A output flow oil inlet flow, not by
Load change influences；When oil-feed P mouths oil inlet quantity is more than the bypass flow of the setting of adjustable throttling 1, choke pressure drop makes adjustable throttling
The oil inlet and oil-out pressure differential of valve 1 are more than the compensation pressure that pressure-compensated valve 2 is set, while the first working hole A and oil-feed
When pressure differential between mouthful P is also greater than set pressure value on pressure-control valve 3, pressure-control valve 3 is on working position, pressure
Force compensating valve 2 makes the oil inlet and outlet pressure differential of adjustable throttling 1 be essentially a constant, eliminates the first working hole A and the second work
Make influence of the mouth B fluctuations of load to the set flow of adjustable throttling 1, it is ensured that constant flow is provided to the first working hole A, it is unnecessary
Flow enters the second working hole B through pressure-control valve 3.
Fourth embodiment as shown in Figure 4, including adjustable throttling 1, pressure-compensated valve 2, pressure-control valve 3 and first drain
Reversal valve 4 is controlled, there is oil inlet P, the first working hole A and the second working hole B, pressure-compensated valve 2, adjustable throttling 1 are gone here and there successively
Connection is arranged between oil inlet P and the first working hole A, and two control ports of guide liquid control change valve 4 are respectively communicated with adjustable throttling
The oil inlet and oil-out of valve 1, the work oil inlet and oil-out of guide liquid control change valve 4 are respectively communicated with the first actuator port A
With the hydraulic control mouth of pressure-control valve 3, pressure-control valve 3 is arranged between oil inlet P and the second working hole B, pressure-control valve 3
Valve port opening is associated with the first working hole A and the oil pressure of oil inlet P through guide liquid control change valve 4, and oil inlet P oil pressure makes pressure control
The valve port opening of valve 3 processed is in increase tendency, and the first working hole A oil pressure makes the valve port opening of pressure-control valve 3 be in reduction trend,
Meanwhile the compensation pressure that pressure-compensated valve 2 and guide liquid control change valve 4 are set is set with commutation pressure less than pressure-control valve 3
Conducting pressure.
Embodiment described above only expresses several embodiments of the present utility model, and its description is more specific and detailed,
But therefore it can not be interpreted as the limitation to utility model patent scope.It should be pointed out that the common skill for this area
For art personnel, without departing from the concept of the premise utility, various modifications and improvements can be made, these are belonged to
The scope of protection of the utility model.Therefore, the protection domain of the utility model patent should be determined by the appended claims.
Claims (6)
1. a kind of flow prior control loop, it is characterised in that the control loop has oil inlet, the first working hole and the second work
Make mouth, that is connected on the oil circuit between the oil inlet and the first working hole is provided with adjustable throttling, pressure-compensated valve, described
Two control ports of the spring cavity of pressure-compensated valve and non-spring cavity are respectively communicated with the oil inlet of the adjustable throttling and fuel-displaced
Mouthful, it is provided with pressure-control valve, the valve of the pressure-control valve on the oil circuit between the oil inlet and second working hole
Mouth aperture is associated with the oil pressure of first working hole and the oil inlet, and the oil inlet oil pressure makes the pressure-control valve
Valve port opening is in increase tendency, and the oil pressure of first working hole makes the valve port opening of the pressure-control valve be in reduction trend,
So as to make the pressure oil fed by the oil inlet preferentially be supplied to first actuator port.
2. a kind of flow prior control loop according to claim 1, it is characterised in that the pressure-compensated valve setting
Compensate the setup pressure value that pressure is less than the pressure-control valve.
3. a kind of flow prior control loop according to claim 1, it is characterised in that the oil inlet and the first work
Setting adjustable throttling, the pressure-compensated valve being sequentially connected in series on oil circuit between mouthful.
4. a kind of flow prior control loop according to claim 1, it is characterised in that the oil inlet and the first work
Setting pressure-compensated valve, the adjustable throttling being sequentially connected in series on oil circuit between mouthful.
5. a kind of flow prior control loop according to claim 4, it is characterised in that also including guide's liquid controlled reversing
Valve, the work oil inlet and oil-out of the guide liquid control change valve respectively with first actuator port and the Stress control
The hydraulic control mouth connection of the non-spring terminal of valve, two control ports of the guide liquid control change valve are entered with the adjustable throttling respectively
Hydraulic fluid port connects with oil-out, and the compensation pressure and commutation pressure of pressure-compensated valve and the guide liquid control change valve setting are less than institute
State the conducting pressure of pressure-control valve setting.
6. a kind of flow prior control loop, it is characterised in that the control loop has oil inlet, the first working hole and the second work
Make mouth, the setting adjustable throttling and closed type pressure being sequentially connected in series on the oil circuit between the oil inlet and the first working hole are mended
Valve is repaid, two control ports of the spring cavity and non-spring cavity of the closed type pressure-compensated valve are respectively communicated with the adjustable throttling
Oil-out and the second actuator port, two control ports of the spring cavity of the pressure-control valve and non-spring cavity are respectively communicated with institute
State the oil inlet and oil-out of adjustable throttling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720776773.8U CN206988194U (en) | 2017-06-29 | 2017-06-29 | A kind of flow prior control loop |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720776773.8U CN206988194U (en) | 2017-06-29 | 2017-06-29 | A kind of flow prior control loop |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206988194U true CN206988194U (en) | 2018-02-09 |
Family
ID=61400162
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720776773.8U Withdrawn - After Issue CN206988194U (en) | 2017-06-29 | 2017-06-29 | A kind of flow prior control loop |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206988194U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109914518A (en) * | 2019-03-13 | 2019-06-21 | 徐州徐工矿业机械有限公司 | A kind of device promoting large excavator power Dynamic Matching |
| CN115698520A (en) * | 2020-06-04 | 2023-02-03 | Smc 株式会社 | Time delay valve and flow controller |
-
2017
- 2017-06-29 CN CN201720776773.8U patent/CN206988194U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109914518A (en) * | 2019-03-13 | 2019-06-21 | 徐州徐工矿业机械有限公司 | A kind of device promoting large excavator power Dynamic Matching |
| CN109914518B (en) * | 2019-03-13 | 2022-04-01 | 徐州徐工矿业机械有限公司 | Device for improving dynamic matching performance of power of large excavator |
| CN115698520A (en) * | 2020-06-04 | 2023-02-03 | Smc 株式会社 | Time delay valve and flow controller |
| CN115698520B (en) * | 2020-06-04 | 2023-10-10 | Smc 株式会社 | Delay valve and flow controller |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20180209 Effective date of abandoning: 20181211 |