CN106567868A - Closed hydraulic system and engineering machinery - Google Patents
Closed hydraulic system and engineering machinery Download PDFInfo
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- CN106567868A CN106567868A CN201510653469.XA CN201510653469A CN106567868A CN 106567868 A CN106567868 A CN 106567868A CN 201510653469 A CN201510653469 A CN 201510653469A CN 106567868 A CN106567868 A CN 106567868A
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- 238000011010 flushing procedure Methods 0.000 claims abstract description 128
- 239000012530 fluid Substances 0.000 claims description 165
- 239000002828 fuel tank Substances 0.000 claims description 15
- 238000004891 communication Methods 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 7
- 239000003921 oil Substances 0.000 abstract description 133
- 239000010720 hydraulic oil Substances 0.000 abstract description 56
- 238000001816 cooling Methods 0.000 abstract description 11
- 230000001502 supplementing effect Effects 0.000 abstract 1
- 239000006185 dispersion Substances 0.000 description 7
- 230000000694 effects Effects 0.000 description 7
- 238000006073 displacement reaction Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 239000004568 cement Substances 0.000 description 3
- 238000004080 punching Methods 0.000 description 3
- 238000005406 washing Methods 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000007812 deficiency Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
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Abstract
The invention discloses a closed hydraulic system and engineering machinery. The closed hydraulic system comprises a hydraulic pump, an oil supplementing pump and a flushing valve; the valve core of the flushing valve is provided with a first station, a second station and a third station, and the valve body of the flushing valve is provided with a first oil port, a second oil port, a third oil port and a fourth oil port; when the valve core of the flushing valve is positioned at a second station, only the second oil port is communicated with the third oil port; when the hydraulic pump is in the meso position, the oil outlet of the oil replenishing pump is communicated with the oil tank through the second oil port and the third oil port of the flushing valve, and meanwhile, the oil outlet of the oil replenishing pump is communicated with the shell of the hydraulic pump through the overflow valve of the oil replenishing pump, so that part of hydraulic oil of the oil replenishing pump sequentially passes through the second oil port and the third oil port of the flushing valve, and then enters the cooler communicated with the third oil port for cooling.
Description
Technical field
The present invention relates to technical field of hydraulic pressure, more particularly to a kind of closed type hydraulic system and engineering machinery.
Background technology
In existing closed type hydraulic system, as shown in figure 1, the inlet port of hydraulic pump 101, oil drain out are direct
It is connected with the oil inlet and outlet of executive component, the hydraulic oil that hydraulic pump 101 is discharged is returned to liquid Jing after actuator
The inlet port of press pump 101, forms closed circulation.Due to the presence for leaking, and rinse, cool down, controlling
Need, closed type hydraulic system is provided with the slippage pump 102 1 in feed circuit, and existing feed circuit
As be dosing pump, its flow can be divided into three parts, a part of that liquid is entered Jing after the overflow of slippage pump overflow valve 103
The housing of press pump 101, is rinsed to housing, cools down, and a part enters Closed Hydraulic by slippage pump 102
System and displace from closed circulation system part fluid through flushing valve 104, rinse overflow valve 105 after
Into cooler, filter etc., some is used for carrying out the control of other hydraulic circuits, due to this portion
Divide oil mass less, be typically negligible, this case simplifies the flow of slippage pump 102 for the ease of description
For front two parts.
The assignment of traffic ratio of above-mentioned two parts hydraulic oil is by slippage pump overflow valve 103 and rinses overflow valve 105
Control, therefore, just can be with by adjusting slippage pump overflow valve 103 and rinsing the setting pressure of overflow valve 105
Control slippage pump 102 flows to the two-part assignment of traffic ratio.In order to balance two-part flow, need by
Two-part flow-control is in certain ratio.For example, concreting machinery, general control flushing liquor press pump 101
Housing fluid for the flow of slippage pump 102 40%, displace closed type hydraulic system flow be slippage pump
The 60% of 102 flows.
In order to not affect the output flow of hydraulic pump 101, hydraulic oil to replace from the low-pressure side of closed type hydraulic system
Go out, when hydraulic pump 101 is located at middle position, i.e. zero delivery, now actuator is in holding state, rinses
Valve 104 is in the second station, because the second station hydraulic fluid port is all closed, so without flow from flushing valve 104
Displace, the housing of the overflow of 102 flow Jing slippage pumps overflow valve of whole slippage pumps 103 to hydraulic pump 101,
Subsequently into fuel tank；Therefore, displace from closed type hydraulic system without flow and cooled down, and slippage pump
102 overflows constantly produce heat causes the hydraulic fluid temperature for entering fuel tank to raise, and depends merely on fuel tank radiating deficiency,
Cause whole hydraulic system temperature rise to increase, be unfavorable for that hydraulic system radiates, radiate especially in the case of little fuel tank
Performance is worse.
The content of the invention
The invention provides a kind of closed type hydraulic system and engineering machinery, even if the closed type hydraulic system is in hydraulic pressure
When pump is in middle position, it is also possible to which the hydraulic oil of slippage pump is cooled down, the temperature rise of closed type hydraulic system is reduced,
Improve the heat dispersion of closed type hydraulic system.
To reach above-mentioned purpose, the present invention provides technical scheme below：
A kind of closed type hydraulic system, including hydraulic pump and slippage pump；
The first oil circuit for connecting with the first oil-out of the hydraulic pump and fuel-displaced with the second of the hydraulic pump
Second oil circuit of mouth connection；
The oil-out of the slippage pump and first oil circuit and the second oil communication are with optionally to described
First oil circuit or the second oil circuit repairing；
Also include flushing valve；
The valve element of the flushing valve has the first station, the second station and 3rd station, and the flushing valve
Valve body is provided with the first hydraulic fluid port, the second hydraulic fluid port, the 3rd hydraulic fluid port and the 4th hydraulic fluid port；First hydraulic fluid port and described
One oil communication, second hydraulic fluid port is connected with the oil-out of the slippage pump, the 4th hydraulic fluid port with it is described
Second oil communication, the 3rd hydraulic fluid port is connected with fuel tank；When the valve element of the flushing valve is in the first station
When, only described first hydraulic fluid port and the 3rd hydraulic fluid port are communicated；When the valve element of the flushing valve is in the second station,
Only described second hydraulic fluid port and the 3rd hydraulic fluid port are communicated, and now, slippage pump is not oily to the first oil circuit and/or second
Road repairing；When the valve element of the flushing valve is in 3rd station, only described 3rd hydraulic fluid port and the 4th hydraulic fluid port phase
It is logical；And when the hydraulic pump discharge is zero, the valve element of the flushing valve is in the second station.
Above-mentioned closed type hydraulic system is provided with flushing valve, and the valve element of flushing valve has three stations, and flushing valve
Valve body is provided with four hydraulic fluid ports, and the first hydraulic fluid port and the first oil communication, and the second hydraulic fluid port is fuel-displaced with slippage pump
Mouth connection, the 4th hydraulic fluid port and the second oil communication；When the valve element of flushing valve is in the first station, only first
Hydraulic fluid port and the 3rd hydraulic fluid port are communicated, and now, can be put in a part of hydraulic oil of the first oil circuit in closed type hydraulic system
Swap out and, and the connection of the first hydraulic fluid port by flushing valve and the 3rd hydraulic fluid port can be such that hydraulic oil carries out into fuel tank
Cooling, and typically cooler can be set on the oil circuit of the hydraulic oil oil sump tank of the flushing valve of closed type hydraulic system
Deng chiller, to strengthen cooling effect；When the valve element of flushing valve is in the second station, only the second hydraulic fluid port
Communicate with the 3rd hydraulic fluid port, a part of hydraulic oil that slippage pump is discharged enters the second hydraulic fluid port of flushing valve, due to this
When only flushing valve the second hydraulic fluid port and the 3rd hydraulic fluid port communicate, therefore, slippage pump discharge a part of hydraulic oil
Can be cooled down into cooler by the 3rd hydraulic fluid port, so a part of hydraulic oil that slippage pump is discharged can pass through
Flushing valve is cooled down into cooler；When flushing valve valve element be in 3rd station when, only the 3rd hydraulic fluid port with
4th hydraulic fluid port is communicated, and now, the second oil circuit is communicated with the 4th hydraulic fluid port of flushing valve, is put in closed type hydraulic system
The a part of hydraulic oil for swapping out can enter the 4th hydraulic fluid port of flushing valve by the second oil circuit, and by the 4th hydraulic fluid port
Cooled down into cooler with the connection of the 3rd hydraulic fluid port.
Therefore, above-mentioned closed type hydraulic system can be reached by the course of the work flushing valve by a part of hydraulic oil
Cement out, even if when hydraulic pump is in middle position, i.e. when the discharge capacity of hydraulic pump is zero, what slippage pump was discharged
A part of hydraulic oil remains to be cooled down by the 3rd hydraulic fluid port inflow cooler of flushing valve, prevents because of slippage pump
Overflow and constantly producing heat causes temperature rise too high, reduce the temperature rise of closed type hydraulic system, and enclosed can be improved
The heat dispersion of hydraulic system.
Preferably, the flushing valve is hydraulic operated valve, and in the valve body of the flushing valve valve pocket is provided with；The valve element
The first spring cavity, the valve element are formed between the valve pocket, and one end of the valve element and the valve pocket
The other end and the valve pocket between form second spring chamber；First spring cavity connects with first oil circuit
It is logical, and the second spring chamber and second oil communication；Wherein：
When the oil pressure in first oil circuit is more than the oil pressure in the second oil circuit, the valve element is in the 3rd work
Position；
When the oil pressure in first oil circuit is less than the oil pressure in the second oil circuit, the valve element is in the first work
Position；
When the oil pressure in first oil circuit is equal to the oil pressure in the second oil circuit, the valve element is in the second work
Position.
Above-mentioned closed type hydraulic system in the course of the work, the of the first oil circuit of closed type hydraulic system and flushing valve
One spring cavity is connected；Second oil circuit is communicated with the second spring chamber of flushing valve；Hydraulic oil in the first oil circuit
Pressure is higher and the second oil circuit in hydraulic fluid pressure it is relatively low when, the pressure of the first spring cavity is higher, second
The pressure of spring cavity is relatively low；Pressure is higher in due to producing pressure differential, therefore the first oil circuit at valve element two ends
Hydraulic oil can promote the valve element of flushing valve to slide to the second relatively low end of pressure from the higher first end of pressure, make
Flushing valve is in 3rd station, and now, the second hydraulic fluid port of flushing valve disconnects, and the 3rd hydraulic fluid port is oily with the 4th
Mouth connection, the 4th hydraulic fluid port and the 3rd hydraulic fluid port displacement that the relatively low hydraulic oil of pressure passes through flushing valve in the second oil circuit
Out, and by the cooler connected with the 3rd hydraulic fluid port cooled down, realized the second oil circuit lower pressure hydraulic oil
Displacement and cooling.
In the same manner, when the hydraulic fluid pressure in the second oil circuit is higher and the first oil circuit in hydraulic fluid pressure it is relatively low
When, the pressure in second spring chamber is higher, and the pressure of the first spring cavity is relatively low, therefore, pressure in the second oil circuit
Higher hydraulic oil can promote the valve element of flushing valve from the second higher end of pressure to the relatively low first end of pressure
Slide, make flushing valve in the first station, now, the second hydraulic fluid port of flushing valve disconnects, and the 3rd hydraulic fluid port
Connect with the first hydraulic fluid port, the 3rd hydraulic fluid port and first that the relatively low hydraulic oil of pressure passes through flushing valve in the first oil circuit
Hydraulic fluid port is cemented out, and the cooler connected by the 3rd hydraulic fluid port with flushing valve is cooled down, and realizes first
The displacement and cooling of oil circuit lower pressure hydraulic oil.
When the pressure of hydraulic oil in the pressure of hydraulic oil in the second oil circuit and the first oil circuit is identical, flushing valve valve
The hydraulic fluid pressure of the spring intracavity at core two ends is equal, therefore valve element is in equilbrium position, i.e. valve element is in
Second station, now, flushing valve only has the second hydraulic fluid port and the connection of the 3rd hydraulic fluid port, and the first hydraulic fluid port and the 4th
Hydraulic fluid port disconnects, because the second hydraulic fluid port of flushing valve is connected with the oil-out of slippage pump, therefore slippage pump goes out
The second hydraulic fluid port and the 3rd hydraulic fluid port connection that hydraulic fluid port passes through flushing valve, makes the hydraulic oil in slippage pump pass through flushing valve
The second hydraulic fluid port and the 3rd hydraulic fluid port enter the cooler that connects with the 3rd hydraulic fluid port and cooled down, in realizing slippage pump
The cooling of hydraulic oil.
So, when hydraulic pump is in middle position, i.e. when the discharge capacity of hydraulic pump is zero, the valve element of flushing valve is in
Second hydraulic fluid port and the 3rd hydraulic fluid port of the second station, only flushing valve is communicated, and the first hydraulic fluid port and the 4th hydraulic fluid port
Disconnect, the oil-out of slippage pump connects the 3rd hydraulic fluid port by the second hydraulic fluid port of flushing valve, discharges slippage pump
A part of hydraulic oil the cooling that connects with the 3rd hydraulic fluid port is entered by second hydraulic fluid port and the 3rd hydraulic fluid port of connection
Device is cooled down to hydraulic oil, therefore can be while closed type hydraulic system temperature rise is reduced, moreover it is possible to improve enclosed
The heat dispersion and stability of hydraulic system.
Preferably, the flushing valve is three-position four-way valve.
Preferably, also including rinsing overflow valve, the of the oil-in of the flushing overflow valve and the flushing valve
Three hydraulic fluid ports are communicated.
Preferably, also including slippage pump overflow valve；The oil-in of the slippage pump overflow valve and the slippage pump
Oil-out connection, the oil-out of the slippage pump overflow valve connects with the housing chamber of the hydraulic pump, is used for
Rinse the housing of the hydraulic pump.
Preferably, also including slippage pump overflow valve, oil-in and the slippage pump of the slippage pump overflow valve
Oil-out connection, the oil-out of the slippage pump overflow valve with it is described flushing overflow valve spring cavity connect,
Meanwhile, the oil-out of the slippage pump overflow valve is connected with the housing chamber of the hydraulic pump, described for rinsing
The housing of hydraulic pump.
In above-mentioned closed type hydraulic system, due to oil-out and the spring for rinsing overflow valve of slippage pump overflow valve
Chamber connects, therefore rinses the hydraulic pressure of the hydraulic pressure of the spring cavity of overflow valve and the oil-out of slippage pump overflow valve
Pressure is identical；When the oil-out back pressure for rinsing overflow valve increases, the flow of slippage pump overflow valve overflows with rinsing
An adjustment process can be produced between the flow of stream valve, its adjustment process is as follows：When rinse overflow valve it is fuel-displaced
When the back pressure of mouth increases, the pressure reduction rinsed between overflow valve oil-in and oil-out can diminish, and rinse first
The valve element aperture of overflow valve can cause the flow for rinsing overflow valve to reduce when not producing change, due to slippage pump
Total flow be constant, and then the flow of slippage pump overflow valve can increase, but, due to slippage pump overflow
The oil-out of valve is connected with the spring cavity for rinsing overflow valve, is rinsed the oil pressure of the spring intracavity of overflow valve and will not be increased
Greatly, and then rinse overflow valve valve element can move under the back pressure effect of its oil-out, so that rinse overflow
The aperture increase of the valve element of valve, and then increase the flow of flushing overflow valve, can reduce by rinsing overflow valve
With the change of the flow proportional relation of slippage pump overflow valve, continue to keep slippage pump two parts stream set in advance
The allocation proportion relation of amount.
Preferably, the oil-out of the slippage pump overflow valve is connected with the spring cavity of the slippage pump overflow valve,
Also, the valve element of the slippage pump overflow valve overflows in the effective active area of the spring intracavity with described flushing
The valve element of stream valve is equal in the effective active area of the spring intracavity.
Preferably, also including flow divider；The oil-in of the flow divider and the oil-out for rinsing overflow valve
Connection, also, the flow divider be provided with the first oil-out for connecting with the oil-in of the flow divider respectively and
Second oil-out, one of first oil-out and the second oil-out connect with the housing chamber of the hydraulic pump
It is logical, for rinsing the housing of the hydraulic pump, the other of first oil-out and the second oil-out with
Fuel tank is connected.
Above-mentioned closed type hydraulic system also includes flow divider, and the fuel-displaced of overflow valve is rinsed in the oil-in connection of flow divider
Mouthful, and one of oil-out connects the housing chamber of hydraulic pump, for the housing of flushing liquor press pump, with right
The housing of hydraulic pump is cooled down, and another oil-out is connected with fuel tank.Now, slippage pump overflow valve only has
There is relief valve, be not involved in the control of assignment of traffic.In the oil liquid leakage for not considering closed type hydraulic system
And in the case of oil circuit control oil, hydraulic oil cemented out by the first oil circuit or the second oil circuit etc.
In whole flows of slippage pump, and the fluid that this is cemented out in prior art probably only accounts for slippage pump and all flows
The 60% of amount, therefore, the present invention is conducive to radiating and the cleaning of closed type hydraulic system.Further, since shunting
Valve itself has the effect of control shunt ratio, and its shunt ratio is not affected by back pressure, therefore can cause to use
The distribution ratio of the flow of the fluid flow in the housing of hydraulic pump and the fluid into chillers such as coolers
Example is not affected by back pressure.
Preferably, the flow divider is adjustable flow distributing valve.
Because closed type hydraulic system adopts adjustable flow distributing valve, therefore can be to the liquid of the two of flow divider oil-outs
Force feed flow proportional is adjusted, and is easy to control the temperature rise of hydraulic pump and hydraulic oil in closed type hydraulic system.
In addition, present invention also offers a kind of with any one Closed Hydraulic provided in above-mentioned technical proposal
The engineering machinery of system.
Description of the drawings
Fig. 1 is the hydraulic principle schematic diagram of closed type hydraulic system in prior art；
The hydraulic principle schematic diagram of the closed type hydraulic system that Fig. 2 is provided for an embodiment of the present invention；
The hydraulic principle schematic diagram of the closed type hydraulic system that Fig. 3 is provided for another kind embodiment of the invention；
The hydraulic principle schematic diagram of the closed type hydraulic system that Fig. 4 is provided for another embodiment of the present invention.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clearly
Chu, it is fully described by, it is clear that described embodiment is only a part of embodiment of the invention, rather than
Whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not making creation
Property work under the premise of the every other embodiment that obtained, belong to the scope of protection of the invention.
A kind of closed type hydraulic system and engineering machinery are embodiments provided, wherein, engineering machinery is adopted
The closed type hydraulic system.Above-mentioned closed type hydraulic system in the course of the work, can continuously by one by flushing valve
Section hydraulic oil is cemented out from closed type hydraulic system, even if when hydraulic pump is in middle position, i.e. hydraulic pump
Discharge capacity when being zero, remain to cement out a part of hydraulic oil, and pass through flushing valve the 3rd by flushing valve
Hydraulic fluid port flows into cooler and is cooled down, and prevents because of slippage pump overflow that constantly producing heat causes temperature rise too high,
The temperature rise of closed type hydraulic system is reduced, and the heat dispersion of closed type hydraulic system can be improved.Engineering machinery can be
Concreting machinery, such as：Concrete pumping plant.
Wherein, Fig. 2, the closed type hydraulic system that an embodiment of the present invention is provided, including hydraulic pump be refer to
1st, slippage pump 5, flushing valve 6 are connected with the first oil-out of hydraulic pump 1 the first oil circuit A and and hydraulic pressure
Second oil circuit B of the second oil-out connection of pump 1；The oil-out of slippage pump 5 and the first oil circuit A and second
Oil circuit B is connected, with optionally to the first oil circuit A or the second oil circuit B repairings；The valve of flushing valve 6
Core 65 has the first station, the second station and 3rd station；Flushing valve 6 includes the first hydraulic fluid port 61, second
Hydraulic fluid port 62, the 3rd hydraulic fluid port 63 and the 4th hydraulic fluid port 64；First hydraulic fluid port 61 is connected with the first oil circuit A, and second
Hydraulic fluid port 62 is connected with the oil-out of slippage pump 5, and the 4th hydraulic fluid port 64 is connected with the second oil circuit B, the 3rd hydraulic fluid port
63 connect with fuel tank；When the valve element 65 of flushing valve 6 is in the first station, only the first hydraulic fluid port 61 and the 3rd
Hydraulic fluid port 63 is communicated；When the valve element 65 of flushing valve 6 is in the second station, only the second hydraulic fluid port 62 and the 3rd is oily
Mouth 63 is communicated, and now, slippage pump 5 is not to the first oil circuit A and/or the second oil circuit B repairings；Work as punching
When the valve element 65 for washing valve 6 is in 3rd station, only the 3rd hydraulic fluid port 63 is communicated with the 4th hydraulic fluid port 64；And work as
When the discharge capacity of hydraulic pump 1 is zero, the valve element 65 of flushing valve 6 is in the second station.
It should be noted that the hydraulic pump 1 in above-mentioned closed type hydraulic system is enclosed pump.Additionally, illustrating
It is bright, in foregoing description " when the valve element 65 of flushing valve 6 is in the first station, the only He of the first hydraulic fluid port 61
3rd hydraulic fluid port 63 is communicated ", show there was only the when the valve element 65 of flushing valve 6 is in the first station herein
One hydraulic fluid port 61 and the 3rd hydraulic fluid port 63 are communicated, and are off between the second hydraulic fluid port 62 and the 4th hydraulic fluid port 64.Together
Reason, remaining can be found in above-mentioned explanation with regard to the description of " only " word, and here is omitted.
Above-mentioned closed type hydraulic system is provided with flushing valve 6, when the valve element 65 of flushing valve 6 is in the first station,
Only the first hydraulic fluid port 61 and the 3rd hydraulic fluid port 63 are communicated, now, can be by the first oil circuit A in closed type hydraulic system
A part of hydraulic oil displacement out, and by the first hydraulic fluid port 61 of flushing valve 6 and connecting for the 3rd hydraulic fluid port 63
Hydraulic oil can be made to be cooled down into fuel tank, and the hydraulic oil oil return of the general flushing valve in closed type hydraulic system
The chillers such as cooler can be set on the oil circuit of case, to strengthen cooling effect；When the valve element 65 of flushing valve 6
In the second station when, only the second hydraulic fluid port 62 and the 3rd hydraulic fluid port 63 are communicated, slippage pump 5 discharge a part
Hydraulic oil enters the second hydraulic fluid port 62 of flushing valve 6, due to the He of the second hydraulic fluid port 62 for now there was only flushing valve 6
3rd hydraulic fluid port 63 is communicated, therefore, a part of hydraulic oil that slippage pump 5 is discharged can be entered by the 3rd hydraulic fluid port 63
Enter cooler to be cooled down, so a part of hydraulic oil that slippage pump 5 is discharged can enter oil by flushing valve 6
Case is cooled down；When the valve element 65 of flushing valve 6 is in 3rd station, only the 3rd hydraulic fluid port 63 is oily with the 4th
Mouth 64 is communicated, and now, the second oil circuit B is communicated with the 4th hydraulic fluid port 64 of flushing valve 6, closed type hydraulic system
In a part of hydraulic oil for displacing the 4th hydraulic fluid port 64 of flushing valve 6 can be entered by the second oil circuit B, and
Cooled down into fuel tank by the 4th hydraulic fluid port 64 and the connection of the 3rd hydraulic fluid port 63.
Therefore, above-mentioned closed type hydraulic system can be reached by the course of the work flushing valve 6 by a part of hydraulic pressure
Oil is cemented out, though when hydraulic pump 1 is in middle position, i.e. when the discharge capacity of hydraulic pump 1 is zero, slippage pump
The 5 a part of hydraulic oil discharged remain to be cooled down by the inflow cooler of the 3rd hydraulic fluid port 63 of flushing valve 6,
Prevent because of the overflow of slippage pump 5 that constantly producing heat causes temperature rise too high, reduce the temperature rise of closed type hydraulic system,
And can improve the heat dispersion of closed type hydraulic system.
Specifically, Fig. 2 is refer to, the flushing valve 6 in a kind of embodiment of the present invention is hydraulic operated valve, is rinsed
Valve pocket is provided with the valve body of valve 6；Valve element 65 be located at valve pocket in, and valve element 65 one end and valve pocket between shape
Into the first spring cavity, second spring chamber is formed between the other end and valve pocket of valve element 65；First spring cavity with
First oil circuit A is connected, and second spring chamber connects with the second oil circuit B；Wherein：
When the oil pressure in the first oil circuit A is more than the oil pressure in the second oil circuit B, valve element 65 is in the 3rd work
Position；
When the oil pressure in the first oil circuit A is less than the oil pressure in the second oil circuit B, valve element 65 is in the first work
Position；
When the oil pressure in the first oil circuit A is equal to the oil pressure in the second oil circuit B, valve element 65 is in the second work
Position.
In the course of the work, the first oil circuit A connects above-mentioned closed type hydraulic system with the first spring cavity of flushing valve 6
It is logical；Second oil circuit B is communicated with the second spring chamber of flushing valve 6；Hydraulic oil pressure in the first oil circuit A
Power is higher and the second oil circuit B in hydraulic fluid pressure it is relatively low when, the pressure of the first spring cavity is higher, second
The pressure of spring cavity is relatively low；Pressure in due to producing pressure differential, therefore the first oil circuit A at the two ends of valve element 65
Higher hydraulic oil can promote the valve element 65 of flushing valve 6 from the higher first end of pressure to pressure it is relatively low
Two ends are slided, and make flushing valve 6 in 3rd station, and now, the second hydraulic fluid port 62 of flushing valve 6 disconnects,
And the 3rd hydraulic fluid port 63 is connected with the 4th hydraulic fluid port 64, the relatively low hydraulic oil of pressure is by punching in the second oil circuit B
The 4th hydraulic fluid port 64 and the 3rd hydraulic fluid port 63 for washing valve 6 cement out, and by connecting with the 3rd hydraulic fluid port 63
Cooler is cooled down, and realizes the displacement and cooling of the second oil circuit B lower pressure hydraulics oil.
In the same manner, when the hydraulic fluid pressure in the second oil circuit B is higher and the first oil circuit A in hydraulic oil pressure
When power is relatively low, the pressure in second spring chamber is higher, and the pressure of the first spring cavity is relatively low, therefore, the second oil circuit
The higher hydraulic oil of pressure can promote the valve element 65 of flushing valve 6 from the second higher end of pressure to pressure in B
Relatively low first end is slided, and makes flushing valve 6 in the first station, now, the second hydraulic fluid port 62 of flushing valve 6
Disconnect, and the 3rd hydraulic fluid port 63 is connected with the first hydraulic fluid port 61, the relatively low hydraulic oil of pressure in the first oil circuit A
Cemented out by the 3rd hydraulic fluid port 63 and the first hydraulic fluid port 61 of flushing valve 6, and by with the 3rd hydraulic fluid port 63
The cooler of connection is cooled down, and realizes the displacement and cooling of the first oil circuit A lower pressure hydraulics oil.
When the pressure of hydraulic oil in the pressure of hydraulic oil in the second oil circuit B and the first oil circuit A is identical, punching
The hydraulic fluid pressure for washing the spring intracavity at the two ends of valve element 65 of valve 6 is equal, therefore valve element 65 is in balance position
Put, i.e. valve element 65 is in the second station, and now, the second hydraulic fluid port 62 and the 3rd of only flushing valve 6 is oily
Mouthfuls 63 connect, and the first hydraulic fluid port 61 and the 4th hydraulic fluid port 64 disconnect, because flushing valve 6 is second oily
Mouth 62 is connected with the oil-out of slippage pump 5, therefore the oil-out of slippage pump 5 passes through the second of flushing valve 6
Hydraulic fluid port 62 is connected with the 3rd hydraulic fluid port 63, makes second hydraulic fluid port of the hydraulic oil in slippage pump 5 by flushing valve 6
62 and the 3rd hydraulic fluid port 63 enter the cooler that connects with the 3rd hydraulic fluid port 63 and cooled down, realize slippage pump 5
The cooling of middle hydraulic oil.
So, when hydraulic pump 1 is in middle position, i.e. when the discharge capacity of hydraulic pump 1 is zero, the valve of flushing valve 6
Core 65 is in the second station, and flushing valve 6 only has the second hydraulic fluid port 62 and the 3rd hydraulic fluid port 63 to communicate, and the
One hydraulic fluid port 61 and the 4th hydraulic fluid port 64 disconnect, and the oil-out of slippage pump 5 passes through the second hydraulic fluid port of flushing valve 6
62 the 3rd hydraulic fluid ports 63 of connection, make a part of hydraulic oil that slippage pump 5 is discharged by the second hydraulic fluid port 62 of connection
The cooler that connects with the 3rd hydraulic fluid port 63 is entered with the 3rd hydraulic fluid port 63 to cool down hydraulic oil, therefore can be
While reducing closed type hydraulic system temperature rise, moreover it is possible to improve the heat dispersion and stability of closed type hydraulic system.
Further, flushing valve 6 can be three-position four-way valve.
It is understood that the flushing valve 6 in the present invention is not limited to above-mentioned hydraulic operated valve, flushing valve 6
Can also be other kinds of valve, such as electromagnetic valve etc., as long as ensureing that it can meet the discharge capacity of hydraulic pump 1 and not be
The hydraulic oil of the low-pressure side of displaceable moiety closed type hydraulic system and when the discharge capacity of hydraulic pump 1 is zero when zero
The hydraulic oil of the oil-out of slippage pump 5 is drained to into fuel tank.
Usually, can be on the connection oil circuit of the oil-out of slippage pump 5 and the first oil circuit A and in slippage pump
It is respectively provided with check valve to realize slippage pump 5 optionally on the connection oil circuit of 5 oil-out and the second oil circuit B
To the first oil circuit A or the second oil circuit B repairings, e.g., in the oil-out and the first oil circuit A of slippage pump 5
Between be provided with the first check valve 2, and be provided between the oil-out and the second oil circuit B of slippage pump 5
Two check valves 3.
One kind is preferably carried out in mode, and closed type hydraulic system also includes rinsing overflow valve 7, rinses overflow valve
7 oil-in is communicated with the 3rd hydraulic fluid port 63 of flushing valve 6.Rinse overflow valve 7 also include spring cavity and with
Spring cavity applies the control chamber of counter force to the valve element for rinsing overflow valve 7, rinses the oil-feed of overflow valve 7
Mouth and oil-out are connected with control chamber.
Specifically, Fig. 2 is refer to, closed type hydraulic system also includes slippage pump in a kind of embodiment of the present invention
Overflow valve 4；The oil-in of slippage pump overflow valve 4 is connected with the oil-out of slippage pump 5, slippage pump overflow valve
4 oil-out is connected with the housing chamber of hydraulic pump 1, for the housing of flushing liquor press pump 1.
Specifically, Fig. 3 is refer to, in another kind of embodiment of the present invention, closed type hydraulic system includes repairing
Pump overflow valve 4, the oil-in of slippage pump overflow valve 4 is connected with the oil-out of slippage pump 5, slippage pump overflow
The oil-out of valve 4 is connected with the spring cavity for rinsing overflow valve 7, meanwhile, the oil-out of slippage pump overflow valve 4
Connect with the housing chamber of hydraulic pump 1, for the housing of flushing liquor press pump 1.
In above-mentioned closed type hydraulic system, due to oil-out and the flushing overflow valve 7 of slippage pump overflow valve 4
Spring cavity is connected, therefore it is fuel-displaced with slippage pump overflow valve 4 to rinse the hydraulic pressure of the spring cavity of overflow valve 7
The hydraulic pressure of mouth is identical；When the increase of the back pressure of oil-out of overflow valve 7 is rinsed, slippage pump overflow valve 4
Flow and rinse overflow valve 7 flow between can produce an adjustment process, its adjustment process it is as follows：When
When the back pressure for rinsing the oil-out of overflow valve 7 increases, the pressure rinsed between the oil-in of overflow valve 7 and oil-out
Difference can diminish, now, if the valve element aperture for rinsing overflow valve 7 does not produce change and will cause to rinse excessive
The flow of stream valve 7 reduces, because the total flow of slippage pump 5 is constant, and then slippage pump overflow valve 4
Flow can increase, but, because oil-out and the spring cavity for rinsing overflow valve 7 of slippage pump overflow valve 4 connect
Logical, rinsing the oil pressure of the spring intracavity of overflow valve 7 will not increase, and and then rinse the valve element meeting of overflow valve 7
Move under the back pressure effect of its oil-out, so as to rinse the aperture increase of the valve element of overflow valve 7, and then make
The flow increase of overflow valve 7 is rinsed, the flow of slippage pump overflow valve 4 reduces, therefore, being so designed that to subtract
The little change by rinsing the flow proportional relation of overflow valve 7 and slippage pump overflow valve 4, continues to keep advance
The allocation proportion relation of two parts flow of slippage pump 5 of setting.
In order to ensure hydraulic oil to the valve element in the spring cavity for rinsing overflow valve 7 and the bullet of slippage pump overflow valve 4
Valve element actuating pressure in spring chamber is identical and makes the spring cavity pressure of flushing overflow valve 7 not affect slippage pump to overflow
The flow proportional relation of stream valve 4 and flushing overflow valve 7, in the present embodiment, the slippage pump overflow valve 4
Structure is identical with the flushing structure of overflow valve 7, and the oil-out and slippage pump that can make slippage pump overflow valve 4 overflows
The spring cavity connection of stream valve 4, also, the valve element of slippage pump overflow valve 4 is in the spring of slippage pump overflow valve 4
The effective active area of intracavity with rinse overflow valve 7 valve element rinse overflow valve 7 spring intracavity it is effective
Active area is equal.
In above-mentioned closed type hydraulic system, slippage pump overflow valve 4 and either hydraulic pump 1 of overflow valve 7 is rinsed
During normal work or when hydraulic pump 1 is zero state in discharge capacity, assignment of traffic is each may participate in, improve system
The heat dispersion of system.
One kind is preferably carried out in mode, refer to Fig. 4, and closed type hydraulic system also includes flow divider 8；Point
Stream valve 8 oil-in with rinse overflow valve 7 oil-out connect, also, flow divider 8 be provided with respectively with divide
First oil-out 81 and the second oil-out 82 of the oil-in connection of stream valve 8, the first oil-out 81 and second
One of oil-out 82 is connected with the housing chamber of hydraulic pump 1, for the housing of flushing liquor press pump 1, the
The other of one oil-out 81 and the second oil-out 82 are connected with fuel tank.
In above-mentioned closed type hydraulic system, the oil-out of overflow valve 7 is rinsed in the oil-in connection of flow divider 8,
As shown in figure 4, one of oil-out, i.e. the second oil-out 82 connect the housing chamber of hydraulic pump 1, use
In the housing of flushing liquor press pump 1, cooled down with the housing to hydraulic pump 1, another oil-out, i.e.,
One oil-out 81 can be connected with fuel tank, and now, slippage pump overflow valve 4 has the effect of relief valve, no
Participate in the control of assignment of traffic.In the oil liquid leakage and oil circuit control oil for not considering closed type hydraulic system
In the case of, the hydraulic oil cemented out by the first oil circuit A or the second oil circuit B is equal to slippage pump 5
Whole flows, and the fluid that this is cemented out in prior art probably only accounts for the 60% of the whole flows of slippage pump 5,
Therefore, the present invention is conducive to radiating and the cleaning of closed type hydraulic system.Further, since flow divider has in itself
The effect of control shunt ratio, its shunt ratio is not affected by back pressure, therefore can be caused for hydraulic pump 1
The fluid flow of housing do not carried on the back with the allocation proportion of the flow of the fluid into the chiller such as cooler
The impact of pressure.
Specifically, flow divider 8 is adjustable flow distributing valve.Because closed type hydraulic system adopts adjustable flow distributing valve,
Therefore can be according to real work needs, the liquid of the first oil-out 81 and the second oil-out 82 to flow divider 8
Force feed flow proportional is adjusted, and is easy to control the temperature rise of hydraulic pump 1 and hydraulic oil in closed type hydraulic system.
Obviously, those skilled in the art can carry out various changes and modification to the embodiment of the present invention and not take off
From the spirit and scope of the present invention.So, if these modifications of the present invention and modification belong to right of the present invention
Within the scope of requirement and its equivalent technologies, then the present invention is also intended to comprising these changes and modification.
Claims (10)
1. a kind of closed type hydraulic system, including hydraulic pump and slippage pump；
The first oil circuit for connecting with the first oil-out of the hydraulic pump and fuel-displaced with the second of the hydraulic pump
Second oil circuit of mouth connection；
The oil-out of the slippage pump and first oil circuit and the second oil communication are with optionally to described
First oil circuit or the second oil circuit repairing；
Characterized in that, also including flushing valve；
The valve element of the flushing valve has the first station, the second station and 3rd station, and the flushing valve
Valve body is provided with the first hydraulic fluid port, the second hydraulic fluid port, the 3rd hydraulic fluid port and the 4th hydraulic fluid port；First hydraulic fluid port and described
One oil communication, second hydraulic fluid port is connected with the oil-out of the slippage pump, the 4th hydraulic fluid port with it is described
Second oil communication；When the valve element of the flushing valve is in the first station, only described first hydraulic fluid port and the 3rd
Hydraulic fluid port is communicated；When the valve element of the flushing valve is in the second station, only described second hydraulic fluid port and the 3rd hydraulic fluid port
Communicate；When the valve element of the flushing valve is in 3rd station, only described 3rd hydraulic fluid port is communicated with the 4th hydraulic fluid port；
And when the hydraulic pump discharge is zero, the valve element of the flushing valve is in the second station.
2. closed type hydraulic system according to claim 1, it is characterised in that the flushing valve is liquid
Dynamic valve, in the valve body of the flushing valve valve pocket is provided with；The valve element is located at the valve pocket, and the valve element
The first spring cavity is formed between one end and the valve pocket, is formed between the other end of the valve element and the valve pocket
Second spring chamber；First spring cavity and first oil communication, and the second spring chamber with it is described
Second oil communication；Wherein：
When the oil pressure in first oil circuit is more than the oil pressure in the second oil circuit, the valve element is in the 3rd work
Position；
When the oil pressure in first oil circuit is less than the oil pressure in the second oil circuit, the valve element is in the first work
Position；
When the oil pressure in first oil circuit is equal to the oil pressure in the second oil circuit, the valve element is in the second work
Position.
3. closed type hydraulic system according to claim 2, it is characterised in that the flushing valve is three
Position four-way valve.
4. the closed type hydraulic system according to any one of claim 1-3, it is characterised in that also wrap
Flushing overflow valve is included, the oil-in of the flushing overflow valve is communicated with the 3rd hydraulic fluid port of the flushing valve.
5. closed type hydraulic system according to claim 4, it is characterised in that also overflow including slippage pump
Stream valve；The oil-in of the slippage pump overflow valve is connected with the oil-out of the slippage pump, and the slippage pump overflows
The oil-out of stream valve is connected with the housing chamber of the hydraulic pump, for rinsing the housing of the hydraulic pump.
6. closed type hydraulic system according to claim 4, it is characterised in that also overflow including slippage pump
Stream valve, the oil-in of the slippage pump overflow valve is connected with the oil-out of the slippage pump, and the slippage pump overflows
The oil-out of stream valve is connected with the spring cavity of the flushing overflow valve, meanwhile, the slippage pump overflow valve goes out
Hydraulic fluid port is connected with the housing chamber of the hydraulic pump, for rinsing the housing of the hydraulic pump.
7. closed type hydraulic system according to claim 6, it is characterised in that the slippage pump overflow
The oil-out of valve is connected with the spring cavity of the slippage pump overflow valve, also, the valve of the slippage pump overflow valve
Core is in the effective active area of the spring intracavity and the valve element of the flushing overflow valve in the spring intracavity
Effective active area it is equal.
8. closed type hydraulic system according to claim 4, it is characterised in that also including flow divider；
The oil-in of the flow divider is connected with the oil-out of the flushing overflow valve, also, the flow divider is provided with
The first oil-out for connecting with the oil-in of the flow divider respectively and the second oil-out, first oil-out
Connect with the housing chamber of the hydraulic pump with one of the second oil-out, for rinsing the shell of the hydraulic pump
Body, the other of first oil-out and the second oil-out are connected with fuel tank.
9. closed type hydraulic system according to claim 8, it is characterised in that the flow divider is for can
Mode flow divider.
10. a kind of engineering machinery, it is characterised in that include the enclosed as described in any one of claim 1-9
Hydraulic system.
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| CN201510653469.XA CN106567868B (en) | 2015-10-10 | 2015-10-10 | Closed hydraulic system and engineering machinery |
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| CN107725197A (en) * | 2017-11-02 | 2018-02-23 | 江苏金通灵流体机械科技股份有限公司 | A kind of gas turbine dislocation generation vehicle electric hydraulic activating system |
| CN108100878A (en) * | 2017-12-06 | 2018-06-01 | 徐州重型机械有限公司 | A kind of crane closed system |
| CN109469665A (en) * | 2017-09-07 | 2019-03-15 | 罗伯特·博世有限公司 | Hydrostatic valve arrangement, hydrostatic transmission with valve arrangement and hydrostatic drive with transmission |
| CN113586559A (en) * | 2021-07-22 | 2021-11-02 | 三一重机有限公司 | Hydraulic oil cooling system and working machine |
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|---|---|
| CN106567868B (en) | 2018-06-01 |
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