CN105840570B - A kind of load sensing multi-way valve first and multi-way valve - Google Patents
A kind of load sensing multi-way valve first and multi-way valve Download PDFInfo
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- CN105840570B CN105840570B CN201510023028.1A CN201510023028A CN105840570B CN 105840570 B CN105840570 B CN 105840570B CN 201510023028 A CN201510023028 A CN 201510023028A CN 105840570 B CN105840570 B CN 105840570B
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- valve
- regulating device
- flow regulating
- overflow valve
- load
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Abstract
The present invention relates to a kind of load sensing multi-way valve first, including：Working connection, load-sensitive oil circuit, main overflow valve, secondary overflow valve, oil return opening, first flow regulating device and second flow regulating device；The entrance of the main overflow valve is connected with the working connection, and the spring cavity of the main overflow valve is connected through the first flow regulating device with the working connection, and the outlet of the main overflow valve is connected with the oil return opening；The entrance of the secondary overflow valve is connected by second flow regulating device and the load-sensitive oil communication, the outlet of the secondary overflow valve with the oil return opening；Pass through the first flow regulating device and second flow regulating device so that the main overflow valve and secondary overflow valve carry out pressure control to the working connection or the load-sensitive oil circuit.The present invention also provides a kind of multi-way valve for including above-mentioned first.The present invention can be suitable for variable pump load sensitive system and constant displacement pump load sensitive system, improve versatility.
Description
Technical field
The present invention relates to technical field of engineering machinery, particularly a kind of load sensing multi-way valve first and multi-way valve.
Background technology
Load sensing multi-way valve is the core element of construction machinery hydraulic system, between pump and executive component, is used for
Hydraulic fluid flow rate size and flow direction are controlled, so as to the direction of motion and speed of centralized Control engineering machinery actuating element.
Load sensing multi-way valve first is generally the oil inlet with safety valve and joins at present, the highest of control hydraulic pump input oil
Pressure generally only applicable constant displacement pump load sensitive system or is only applicable to variable pump load sensitive system, due to that can only be applicable in
In a kind of load sensitive system, therefore versatility is poor.
The content of the invention
The purpose of the present invention is to propose to a kind of load sensing multi-way valve first and multi-way valves, can be suitable for variable pump load
Sensory system and constant displacement pump load sensitive system improve versatility.
To achieve the above object, the present invention proposes a kind of load sensing multi-way valve first, including：Working connection, load-sensitive
Oil circuit, main overflow valve, secondary overflow valve, oil return opening, first flow regulating device and second flow regulating device；
The entrance of the main overflow valve is connected with the working connection, and the spring cavity of the main overflow valve is through the first flow
Regulating device is connected with the working connection, and the outlet of the main overflow valve is connected with the oil return opening；
The entrance of the secondary overflow valve is described secondary by second flow regulating device and the load-sensitive oil communication
The outlet of grade overflow valve is connected with the oil return opening；
Pass through the first flow regulating device and second flow regulating device so that the main overflow valve and secondary overflow
Valve carries out pressure control to the working connection or the load-sensitive oil circuit；
The load sensing multi-way valve first further includes check valve, dynamic antivibration valve and damping, the dynamic antivibration valve
Non- spring cavity and the load-sensitive oil communication, the spring cavity of the dynamic antivibration valve and the entrance of the dynamic antivibration valve connect
Logical, the damping is located between entrance and the load-sensitive oil circuit of the dynamic antivibration valve, the outlet of the main overflow valve,
The outlet of the secondary overflow valve and the outlet of the dynamic antivibration valve are connected through the check valve with the oil return opening.
Further, the first flow regulating device and second flow regulating device can be in damping states and off-state
Between switch；When working connection couples constant displacement pump, the first flow regulating device is damping state, and the second flow is adjusted
Device is off-state；When the working connection couples variable pump, the first flow regulating device is off-state, described the
Two flow regulators are damping state.
Further, when working connection couples constant displacement pump, the first flow regulating device is damps, the second flow
Regulating device is stifled；When the working connection couples variable pump, the first flow regulating device is stifled, the second flow tune
Regulating device is damping.
Further, the oil return opening includes the first oil return opening and the second oil return opening, and it is unidirectional that the check valve includes first
Valve and the second check valve；The outlet of the main overflow valve and the outlet of the secondary overflow valve are through first check valve and second
Check valve is connected with the first oil return opening and the second oil return opening.
Further, including middle position unloading valve, the entrance of the middle position unloading valve is connected with the working connection, the middle position
The spring cavity of unloading valve and the load-sensitive oil communication, the outlet of the middle position unloading valve is through the check valve and described time
Hydraulic fluid port connects；The non-spring cavity of the middle position unloading valve is connected with the entrance of the middle position unloading valve.
Further, the spool of the main overflow valve in the end face of the non-spring cavity one side of the main overflow valve along poppet shaft
It concaves.
Further, the main overflow valve is three-way flowrate valve.
The present invention also provides a kind of multi-way valve, including above-mentioned load sensing multi-way valve first.
In the present invention, for variable pump load sensitive system, adjusted by first flow regulating device and second flow
The adjusting of device, the main overflow valve and secondary overflow valve to be caused to control the pressure of working connection；For constant displacement pump load-sensitive
System, by the adjusting of first flow regulating device and second flow regulating device, the main overflow valve and secondary to be caused to overflow
The pressure of valve control load-sensitive oil circuit is flowed, therefore, load sensing multi-way valve first of the invention and multi-way valve can either fit
Constant displacement pump load sensitive system is can be suitably used for again for variable pump load sensitive system, improves versatility.
Description of the drawings
Attached drawing described herein is used for providing a further understanding of the present invention, forms the part of the application, this hair
Bright schematic description and description does not constitute improper limitations of the present invention for explaining the present invention.In the accompanying drawings：
Fig. 1 is that the hydraulic pressure of one specific embodiment of load sensing multi-way valve first of the present invention in the first operative state is former
Reason figure.
Fig. 2 is that the hydraulic pressure of one specific embodiment of load sensing multi-way valve first of the present invention in a second operative state is former
Reason figure.
Fig. 3 is the schematic diagram of another specific embodiment of the load sensing multi-way valve first of the present invention.
Fig. 4 is the schematic diagram of another specific embodiment of the load sensing multi-way valve first of the present invention.
Fig. 5 a-5d be the present invention load sensing multi-way valve first first valve body in each valve body structure sectional view.
Specific embodiment
Below by drawings and examples, technical scheme is described in further detail.
Fig. 1 and Fig. 2 is a kind of one embodiment of load sensing multi-way valve first of the present invention under different working condition
Hydraulic diagram, with reference to Fig. 5, that includes working connection, load-sensitive oil circuit, main overflow valve 1, secondary overflow valve 4, oil return openings
K, T, first flow regulating device 2 and second flow regulating device 3；The constant displacement pump or variable pump 22 join with the working connection
It connects；The entrance of the main overflow valve 1 is connected with the working connection, and the spring cavity of the main overflow valve 1 is through the first flow tune
Regulating device 2 is connected with the working connection, and the outlet of the main overflow valve 1 is connected with described oil return opening K, T；The secondary overflow valve
4 entrance is by second flow regulating device 3 and the load-sensitive oil communication, the outlet of the secondary overflow valve 4 and institute
State oil return opening K, T connection；Pass through the first flow regulating device 2 and second flow regulating device 3 so that the main overflow valve
1 carries out pressure control with secondary overflow valve 4 to the working connection or the load-sensitive oil circuit.
Referring to Fig. 1, if working connection connection is variable pump, second flow regulating device 3 is closed, pressure oil is oily from P
After mouth enters first valve body, partial pressure oil acts on the non-spring cavity end of main overflow valve 1, and another part pressure oil passes through first
Flow regulator 2 is respectively acting on the spring cavity end of main overflow valve 1 and the non-spring cavity end of secondary overflow valve 4, when secondary is overflow
Stream valve 4 is when be not turned on, and it is identical to act on the pressure at main 1 both ends of overflow valve, under the action of the spring, at main overflow valve 1
In closed state；When the pressure of pressure oil reaches the setting pressure of secondary 4 spring of overflow valve, secondary overflow valve 4 is opened, pressure oil
Pressure drop is generated by first flow regulating device 2, main 1 pressure at two ends of overflow valve is different at this time, and the pressure of non-spring cavity one end is big
In the sum of spring cavity end pressure and spring force, main overflow valve 1 is opened, and pressure oil is from off-load at main overflow valve 1；Referring to Fig. 2, if
Working connection connection is constant displacement pump, and first flow regulating device 2 is closed, and pressure oil is only made after entering first valve body from P hydraulic fluid ports
For the non-spring cavity end of main overflow valve 1, load-sensitive oil circuit feedback pressure acts on spring cavity end and the secondary of main overflow valve 1
The non-spring cavity of overflow valve 4, when load-sensitive oil circuit feedback pressure changes, the openings of sizes of main overflow valve 1 is by load-sensitive
The decision of the sum of oil circuit feedback pressure and spring force is also changed by the flow of main overflow valve 1, therewith into the excess traffic of system
T K oil return openings can be shunted back from three-way flowrate valve.
It, can be by 2 He of first flow regulating device in an other embodiment according to the needs of actual conditions
Second flow regulating device 3 is arranged to switch between damping state and off-state；When working connection couples constant displacement pump, institute
First flow regulating device 2 is stated as damping state, the second flow regulating device 3 is off-state；When the working connection joins
When connecing variable pump, the first flow regulating device 2 is off-state, and the second flow regulating device 3 is damping state.
In an other embodiment, specifically, when working connection couples constant displacement pump, the first flow regulating device
2 be damping, and the second flow regulating device 3 is stifled；When the working connection couples variable pump, the first flow adjusts dress
It is stifled to put 2, and the second flow regulating device 3 is damping.
Check valve is further included in the present embodiment；The outlet of the main overflow valve 1 and the outlet of the secondary overflow valve 4 are through institute
Check valve is stated to connect with described oil return opening K, T.
Specifically, described oil return opening K, T include the first oil return opening K and the second oil return inlet T, and it is single that the check valve includes first
To 8 and second check valve 9 of valve；The outlet of the main overflow valve 1 and the outlet of the secondary overflow valve 4 are through first check valve
8 and second check valve 9 connected with the first oil return opening K and the second oil return inlet T.
In another embodiment, present invention additionally comprises dynamic antivibration valve 5 and damping 6, the dynamic antivibration valve 5 it is non-
Spring cavity and the load-sensitive oil communication, the spring cavity of the dynamic antivibration valve 5 and the entrance of the dynamic antivibration valve 5 connect
Logical, the damping 6 is located between entrance and the load-sensitive oil circuit of the dynamic antivibration valve 5.Load-sensitive oil circuit pressure
Oily partial action is in the non-spring cavity of dynamic antivibration valve 5, the spring cavitys for partly acting on dynamic antivibration valve 5 by damping 6, due to
Pressure oil is constant in the pressure difference by damping 6 rear and front ends, and the flow by dynamic antivibration valve 5 is also constant, and flow is by damping 6
Size control, when load-sensitive pressure change is too fast, can eliminate load pressure fluctuation, reduce compression shock, improve
The flow output stability of load sensitive pump.
In order to lay down flow during load sensitive pump middle position, prevent from increasing because of system middle position pressure, cause engine
It is flame-out, in one embodiment, present invention additionally comprises middle position unloading valve 7, entrance and the working connection of the middle position unloading valve 7
Connection, the spring cavity of the middle position unloading valve 7 and the load-sensitive oil communication, the outlet of the middle position unloading valve 7 is through institute
Check valve is stated to connect with described oil return opening K, T；The entrance of the non-spring cavity of the middle position unloading valve 7 and the middle position unloading valve 7
Connection.
In one embodiment, the main overflow valve 1 is three-way flowrate valve.
Each valve body structure in the first valve body of the load sensing multi-way valve first of the present invention is carried out with reference to Fig. 5 a-5d
Briefly introduce.Fig. 5 a show the sectional view of the first valve body of the present invention, and the spool of main overflow valve 1 is close to spring cavity in figure
One side is equipped with damping 2, and middle position unloading valve 7 is located at the position in parallel with the main overflow valve 1, and check valve 8 and 9 is additionally provided in valve body.
In figure 5b, the pipeline of secondary overflow valve 4 is equipped with stifled 3.Damping 6 is equipped on the pipeline of the dynamic antivibration valve 5 shown in Fig. 5 c.
Particularly, as fig 5d, the spool of the main overflow valve 1 in the end face of the non-spring cavity one side of the main overflow valve 1 along valve
Mandrel concaves, and has inner fovea part C, and which increase initial action areas, reduce compression shock when opening.
Finally it should be noted that：The above embodiments are merely illustrative of the technical scheme of the present invention and are not intended to be limiting thereof；To the greatest extent
The present invention is described in detail with reference to preferred embodiments for pipe, those of ordinary skills in the art should understand that：Still
It can modify to the specific embodiment of the present invention or equivalent substitution is carried out to some technical characteristics；Without departing from this hair
The spirit of bright technical solution should all cover among the claimed technical solution scope of the present invention.
Claims (8)
1. a kind of load sensing multi-way valve first, which is characterized in that including：Working connection, load-sensitive oil circuit, main overflow valve (1),
Secondary overflow valve (4), oil return opening (K, T), first flow regulating device (2) and second flow regulating device (3)；
The entrance of the main overflow valve (1) is connected with the working connection, and the spring cavity of the main overflow valve (1) is through described first-class
Quantity regulating device (2) is connected with the working connection, and the outlet of the main overflow valve (1) is connected with the oil return opening (K, T)；
The entrance of the secondary overflow valve (4) is described by second flow regulating device (3) and the load-sensitive oil communication
The outlet of secondary overflow valve (4) is connected with the oil return opening (K, T)；
Pass through the first flow regulating device (2) and second flow regulating device (3) so that the main overflow valve (1) and time
Grade overflow valve (4) carries out pressure control to the working connection or the load-sensitive oil circuit；
The load sensing multi-way valve first further includes check valve, dynamic antivibration valve (5) and damping (6), the dynamic antivibration valve
(5) non-spring cavity and the load-sensitive oil communication, spring cavity and the dynamic antivibration valve of the dynamic antivibration valve (5)
(5) entrance connection, the damping (6) are located between entrance and the load-sensitive oil circuit of the dynamic antivibration valve (5), institute
The exporting of main overflow valve (1), the outlet of the secondary overflow valve (4) and the outlet of the dynamic antivibration valve (5) are stated through the list
It is connected to valve with the oil return opening (K, T).
2. load sensing multi-way valve first as described in claim 1, which is characterized in that the first flow regulating device (2)
And second flow regulating device (3) can switch between damping state and off-state；It is described when working connection couples constant displacement pump
First flow regulating device (2) is damping state, and the second flow regulating device (3) is off-state；When the working connection
When coupling variable pump, the first flow regulating device (2) is off-state, and the second flow regulating device (3) is damping
State.
3. load sensing multi-way valve first as described in claim 1, which is characterized in that when working connection couples constant displacement pump, institute
First flow regulating device (2) is stated as damping, the second flow regulating device (3) is stifled；When the working connection couples variable
During pump, the first flow regulating device (2) is stifled, and the second flow regulating device (3) is damping.
4. load sensing multi-way valve first as described in claim 1, which is characterized in that the oil return opening (K, T) includes first
Oil return opening (K, T) and the second oil return opening (K, T), the check valve include the first check valve (8) and the second check valve (9)；It is described
The outlet of main overflow valve (1) and the outlet of the secondary overflow valve (4) are through first check valve (8) and the second check valve (9)
It is connected with the first oil return opening (K, T) and the second oil return opening (K, T).
5. load sensing multi-way valve first as described in claim 1, which is characterized in that including middle position unloading valve (7), in described
The entrance of position unloading valve (7) is connected with the working connection, spring cavity and the load-sensitive oil circuit of the middle position unloading valve (7)
Connection, the outlet of the middle position unloading valve (7) is connected through the check valve with the oil return opening (K, T)；The middle position unloading valve
(7) non-spring cavity is connected with the entrance of the middle position unloading valve (7).
6. load sensing multi-way valve first as described in claim 1, which is characterized in that the spool of the main overflow valve (1) exists
The end face of the non-spring cavity one side of the main overflow valve (1) concaves along poppet shaft.
7. load sensing multi-way valve first as described in claim 1, which is characterized in that the main overflow valve (1) is three-way flow
Measure valve.
8. a kind of multi-way valve, which is characterized in that including the multi-way valve first such as claim 1~7 as described in any one.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510023028.1A CN105840570B (en) | 2015-01-16 | 2015-01-16 | A kind of load sensing multi-way valve first and multi-way valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510023028.1A CN105840570B (en) | 2015-01-16 | 2015-01-16 | A kind of load sensing multi-way valve first and multi-way valve |
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| CN105840570A CN105840570A (en) | 2016-08-10 |
| CN105840570B true CN105840570B (en) | 2018-05-29 |
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| CN201510023028.1A Active CN105840570B (en) | 2015-01-16 | 2015-01-16 | A kind of load sensing multi-way valve first and multi-way valve |
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Families Citing this family (2)
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| CN107420365B (en) * | 2017-06-20 | 2023-11-07 | 江苏徐工工程机械研究院有限公司 | Load-sensitive control valve and load-sensitive control system |
| CN110410532A (en) * | 2019-07-18 | 2019-11-05 | 圣邦集团有限公司 | A kind of variable pressure difference flow divider and hydraulic control system based on damping bridge |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE10004905C2 (en) * | 2000-02-04 | 2002-10-24 | Orenstein & Koppel Ag | Method and device for controlling a lifting cylinder, in particular of working machines |
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|---|---|---|---|---|
| DE19850457A1 (en) * | 1998-11-02 | 2000-05-04 | Mannesmann Rexroth Ag | Hydraulic control system for loading machine or forklift truck has lift cylinder connected to set of multiway regulating valves |
| CN103122648A (en) * | 2012-12-28 | 2013-05-29 | 上海三一重机有限公司 | Multi-way valve hydraulic control system, rectilinear walking control valve and excavator |
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