CN201747703U - Sealed hydraulic system - Google Patents
Sealed hydraulic system Download PDFInfo
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- CN201747703U CN201747703U CN2010202057533U CN201020205753U CN201747703U CN 201747703 U CN201747703 U CN 201747703U CN 2010202057533 U CN2010202057533 U CN 2010202057533U CN 201020205753 U CN201020205753 U CN 201020205753U CN 201747703 U CN201747703 U CN 201747703U
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- 230000001105 regulatory effect Effects 0.000 claims description 47
- 239000002828 fuel tank Substances 0.000 claims description 24
- 239000007788 liquid Substances 0.000 claims description 24
- 230000005611 electricity Effects 0.000 claims description 23
- 238000011010 flushing procedure Methods 0.000 claims description 19
- 239000012224 working solution Substances 0.000 claims description 13
- 230000000630 rising effect Effects 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 45
- 239000010720 hydraulic oil Substances 0.000 description 30
- 238000006073 displacement reaction Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 239000010729 system oil Substances 0.000 description 3
- 230000002950 deficient Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 101150034459 Parpbp gene Proteins 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000008676 import Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000026676 system process Effects 0.000 description 1
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Abstract
The utility model provides a sealed hydraulic system which comprises an oil compensating loop, wherein a first electric control adjusting control valve (1) is connected between an output pipeline (10) of an oil compensating pump (4) of the oil compensating loop and an oil box (9). According to the running condition, the sealed hydraulic system can timely control the oil compensating pressure and the flow distribution of the oil compensating pump (4) or can timely realize the automatic disassembly of the oil compensating pump, thereby being capable of effectively reducing the power loss of the sealed hydraulic system, and preventing the temperature of the sealed hydraulic system and the oil pump from excessively rising.
Description
Technical field
The utility model relates to a kind of closed type hydraulic system, more specifically, relates to a kind of closed type hydraulic system that comprises feed circuit.
Background technique
Closed type hydraulic system is widely used in Hydraulic Field.Closed type hydraulic system adopts closed hydraulic loop, and so-called closed hydraulic loop is exactly that hydraulic oil directly circulates and the oil hydraulic circuit of the fuel tank of not flowing through in hydraulic system.
Say that from perfect condition closed hydraulic loop constitutes self-enclosed system, the hydraulic pressure oil mass in its loop is fixed, and still, this only is a kind of perfect condition.In the closed hydraulic loop of reality, can there be the leakage and the consumption of fluid inevitably, if untimely closed hydraulic loop is carried out replenishing of hydraulic oil, then in oil hydraulic circuit parital vacuum may appear, this must do one's utmost to be avoided.In addition, closed type hydraulic system is after working long hours, and the temperature of hydraulic oil can sharply rise, and makes the stickiness generation notable change of hydraulic oil, and causes hydraulic oil rotten, and this can have influence on the working efficiency of closed type hydraulic system.
In view of the above problems, in closed type hydraulic system, need to be provided with the feed circuit that comprises slippage pump, so that according to circumstances replenish the hydraulic oil that leaks and consume to the low voltage side of closed hydraulic loop, in addition, in order to replace the hydraulic oil in the closed hydraulic loop, described closed type hydraulic system generally also is provided with flushing valve, so that a part of hydraulic oil displacement oil sump tank in the closed hydraulic loop is cooled off.
Fig. 1 shows a kind of closed type hydraulic system that typically comprises feed circuit.In Fig. 1, the pressure of slippage pump 4 is set by manual tune formula relief valve 1 ', and the pressure of this manual tune formula relief valve 1 ' adopts manual tune, generally all manually mixes up in advance, in described closed type hydraulic system working procedure, the pressure of this manual tune formula relief valve 1 ' remains unchanged.Simultaneously, in order to replace the hydraulic oil in the closed type hydraulic system working connection, generally be provided with flushing valve, this flushing valve comprises 3-position-3-way selector valve 7 and manual tune formula relief valve 2 ', so that a part of hydraulic oil in the closed type hydraulic system working connection is replaced oil sump tank 9 to cool off.By manual tune formula relief valve 2 ' manual tune, it generally also manually mixes up in advance the pressure of this flushing valve equally, and pressure remains unchanged in the course of the work.When having manual tune formula relief valve 1 ' and described flushing valve simultaneously, the oil compensation pressure of slippage pump 4 determined jointly by both, pressure dependence between the two determine again the to flow through flow of manual tune formula relief valve 1 ' and the flow of the described flushing valve of flowing through.Therefore, at work, the flow of the hydraulic oil of described closed type hydraulic system displacement is also fixed.
But, there is following defective in this prior art: first, slippage pump 4 unnecessary hydraulic fluid flow rates flow back to fuel tank 9 in the overflow mode, because the oil pressure relief of manual tune formula relief valve 1 ' is to set in advance, in the hydraulic work system process, can not regulate according to operating mode, promptly only be equal to or greater than the oil pressure relief of manual tune formula relief valve 1 ' in the oil compensation pressure of slippage pump 4, the unnecessary flow of hydraulic oil could flow back to fuel tank 9 via this manual tune formula relief valve 1 ', therefore often there is bigger power loss in the course of the work, and causes the hydraulic system heating; Second, the oil compensation pressure of this slippage pump can not be with regulating working conditions, therefore the excess flow of the manual tune of flowing through formula relief valve 1 ' and the flow of the described flushing valve of flowing through can not carry out real-time regulated according to the runnability of hydraulic system, and this usually causes the temperature of hydraulic system or hydraulic oil too high.
Therefore, need a kind of closed type hydraulic system of oil compensation pressure that can the real-time regulated slippage pump, can reducing the power loss of system, and prevent that effectively the excessive temperature of closed type hydraulic system from rising.
The model utility content
Technical problem to be solved in the utility model provides a kind of closed type hydraulic system, this closed type hydraulic system can the described slippage pump of real-time regulated oil compensation pressure, so that the hydraulic oil of the unnecessary flow of described slippage pump is at the dirty oil sump tank of suitable pressure state, thereby can reduce the power loss of hydraulic system.
For solving the problems of the technologies described above, the utility model provides a kind of closed type hydraulic system, and this closed type hydraulic system comprises feed circuit, wherein, is connected with the first automatically controlled regulating type control valve between the output pipe of the slippage pump of described feed circuit and the fuel tank.
Preferably, described feed circuit is arranged between the high pressure side pipeline and low voltage side pipeline of described closed type hydraulic system, this feed circuit comprises the unidirectional relief valve of relative connection, each described unidirectional relief valve comprises one-way valve and relief valve in parallel, the inlet of described slippage pump is communicated with described fuel tank, and outlet is connected on the connecting pipeline between the described unidirectional relief valve by described output pipe.
Preferably, the described first automatically controlled regulating type control valve is electricity liquid ratio relief valve, servovalve or electromagnetic relief valve.
Preferably, described closed type hydraulic system also comprises flushing valve, this flushing valve comprises the 3-position-3-way selector valve and the second automatically controlled regulating type control valve, two inlets of described 3-position-3-way selector valve respectively with the high pressure side pipeline and the low voltage side pipeline connection of described closed type hydraulic system, the outlet of described 3-position-3-way selector valve is communicated with the inlet of the described second automatically controlled regulating type control valve.
Preferably, the described second automatically controlled regulating type control valve is electricity liquid ratio relief valve, servovalve or electromagnetic relief valve.
Preferably, the outlet of the described second automatically controlled regulating type control valve is communicated with described fuel tank or cooler.
Preferably, described 3-position-3-way selector valve is a hyraulic controlled type 3-position-3-way selector valve.
Preferably, the described first automatically controlled regulating type control valve is a solenoid directional control valve, this electromagnetic switch valve inlet is connected with described output pipe, outlet and described fuel tank or accordingly the low pressure oil circuit communicate, and between described output pipe and described fuel tank or low pressure oil circuit, also be provided with the manual regulating type relief valve in parallel with described solenoid directional control valve.
Preferably, described slippage pump is a gear pump.
Preferably, the working solution press pump of described slippage pump and described closed type hydraulic system is driven by same drive unit.
The utility model can be controlled the oil compensation pressure and the assignment of traffic of slippage pump in real time according to the runnability of hydraulic system, thereby can reduce the power loss of closed type hydraulic system effectively, and reduces hydraulic system and the bad temperature rising of oil pump significantly.Particularly, by in the feed circuit of slippage pump, the first automatically controlled regulating type control valve being installed (for example, electricity liquid ratio relief valve, servovalve or electromagnetic relief valve etc.), under optimal way, the second automatically controlled regulating type control valve can also be housed simultaneously in the hydraulic oil flush loop, thereby can come the oil pressure relief of two valves is carried out real-time regulated according to working hydraulic pressure pump delivery or rotating speed, with oil compensation pressure and the assignment of traffic of controlling described slippage pump.Therefore, by closed type hydraulic system of the present utility model, can regulate the oil compensation pressure and the assignment of traffic of slippage pump flexibly effectively, thereby can make described closed type hydraulic system operate under the more optimum working state.
Description of drawings
Describe preferred implementation of the present utility model in detail below in conjunction with accompanying drawing, by describing in detail, above-mentioned and other purpose of the present utility model, feature and advantage will be more obvious:
Fig. 1 is the schematic diagram of a kind of typical closed type hydraulic system in the prior art;
Fig. 2 is the schematic diagram of the closed type hydraulic system of a kind of preferred implementation of the utility model; And
Fig. 3 is the schematic diagram of the closed type hydraulic system of the another kind of preferred implementation of the utility model;
The reference mark explanation:
1 ' manual tune formula relief valve, 1 first automatically controlled regulating type control valve
2 ' manual tune formula relief valve, 2 second automatically controlled regulating type control valves
3 working solution press pumps, 4 slippage pumps
5 solenoid directional control valves, 6 actuators
7 3-position-3-way selector valves, 8 unidirectional relief valves
The output pipe of 9 fuel tanks, 10 slippage pumps
Embodiment
Below describe preferred implementation of the present utility model with reference to the accompanying drawings.In the description related to the preferred embodiment process, some selectable simple variant modes of additional disclosure.
Fig. 2 shows the closed type hydraulic system of a kind of preferred implementation of the utility model.
As shown in Figure 2, the working solution press pump 3 of this closed type hydraulic system is a kind of double-action type variable displacement pump, and is connected in actuator 6 to constitute the confining liquid hydraulic circuit by working connection.Need to prove, because the working solution press pump 3 among Fig. 1 is the double-action type variable displacement pump, therefore the high pressure side and the low voltage side of this closed type hydraulic system change, it depends on the action direction of working solution press pump 3, but, on arbitrary operative orientation of working solution press pump 3, the high pressure side of described closed type hydraulic system and low voltage side are objective reality.Certainly, closed type hydraulic system shown in Figure 2 only is a kind of example, and in other closed type hydraulic system of different purposes, working solution press pump 3 also can be single effect formula variable displacement pump, metering pump etc.In addition, actuator 6 can be any hydraulic actuator that meets described closed type hydraulic system application purpose, for example oil hydraulic cylinder, oil hydraulic motor etc., and these tangible simple variant modes all belong to protection domain of the present utility model.
In Fig. 2, the working solution press pump 3 of described closed type hydraulic system of supposing Fig. 2 is along oil hydraulic circuit clockwise direction pump oil, and then the upper pipeline among the figure is the high pressure side, and the bottom pipeline is a low voltage side, and this closed type hydraulic system comprises feed circuit.This feed circuit comprises two unidirectional relief valves 8 and slippage pump 4, these two unidirectional relief valves 8 connect relatively, and being connected to the high pressure side and the low voltage side of described closed type hydraulic system separately by pipeline, slippage pump 4 then is connected on two connecting pipelines between the unidirectional relief valve 8.Known ground, each unidirectional relief valve 8 comprises relief valve (i.e. " overload valve ") and one-way valve, its annexation is fixed, generally be relief valve and one-way valve parallel connection (inlet side of relief valve and one-way valve be connected and then be connected on described high pressure side pipeline or the low voltage side pipeline, the outlet side of relief valve is connected with the conducting side of one-way valve) by side.In addition, although show that in the preferred implementation of Fig. 2 slippage pump 4 and working solution press pump 3 are the twin working pump, but, what those skilled in the art obviously can expect is, this slippage pump 4 and working solution press pump 3 also can drive by drive unit separately, and not necessarily adopt the duplex pattern by same drive unit (for example motor, internal-combustion engine etc.).
As shown in Figure 2, the feed circuit of described closed type hydraulic system comprises slippage pump 4, the inlet of this slippage pump 4 is communicated with fuel tank 9, the outlet then be connected on two connecting pipelines between the relative unidirectional relief valve 8 by output pipe 10, promptly with two unidirectional relief valves 8 between connecting pipeline be communicated with.Be connected with the first automatically controlled regulating type control valve 1 (being shown as electricity liquid ratio relief valve 1 among Fig. 2) on the output pipe of slippage pump 4, the inlet of this electricity liquid ratio relief valve 1 is connected with the output pipe of slippage pump 4, and outlet then is connected with fuel tank 9.Why the utility model adopts electricity liquid ratio relief valve, is that electricity liquid ratio relief valve is that a kind of pressure of hydraulic oil and flow of can making followed the control valve that control signal changes continuously or pari passu.Like this, when being undertaken in the process of repairing by 4 pairs of closed type hydraulic systems of slippage pump, in case there is the unnecessary flow (being that the hydraulic oil that pumps of slippage pump 4 is too much) of hydraulic oil, just can regulate the oil pressure relief of electricity liquid ratio relief valve 1 in real time, make the unnecessary flow of hydraulic oil at the dirty oil sump tank 9 of suitable pressure state, thereby the oil pressure relief of having avoided the hydraulic-pressure pump of unnecessary flow being pressed onto setting as prior art could be realized the defective of overflow, so has avoided power loss.
The function that above-mentioned electricity liquid ratio relief valve is realized is the operating mode according to slippage pump 4, and the oil compensation pressure of regulating slippage pump 4 in real time imports fuel tank 9 with the hydraulic oil with unnecessary flow.Selectively, the first automatically controlled regulating type control valve 1 also can adopt servovalve or electromagnetic relief valve to replace, and this can realize application purpose of the present utility model equally.
Need to prove at this, the feed circuit that is made of two unidirectional relief valves 8 and slippage pump 4 that shows among Fig. 2 only is a kind of example, in fact, in closed type hydraulic system, there are various types of feed circuits, for example the most simply, feed circuit can be that outlet with slippage pump 4 is connected on the low voltage side pipeline of described closed type hydraulic system via one-way valve.But; no matter adopt the feed circuit of which kind of type; as long as this feed circuit adopted technique scheme of the present utility model, promptly between the output pipe of slippage pump 4 and fuel tank 9, be provided with the above-mentioned first automatically controlled regulating type control valve 1, then all belong to protection domain of the present utility model.
Preferably, as shown in Figure 2, between the high pressure side of described closed type hydraulic system pipeline and low voltage side pipeline, also comprise the hydraulic oil flush loop that is arranged in parallel with described feed circuit.This hydraulic oil flush loop is provided with flushing valve, this flushing valve comprises the 3-position-3-way selector valve 7 and the second automatically controlled regulating type control valve 2 (being shown as electricity liquid ratio relief valve 2 among Fig. 2), wherein two of 3-position-3-way selector valve 7 inlets are connected to the high pressure side pipeline and the low voltage side pipeline of described closed type hydraulic system separately, are connected with second electricity liquid ratio relief valve 2 between the outlet of this 3-position-3-way selector valve 7 and the fuel tank 9.By this flushing valve, when hydraulic fluid temperature is too high in the described closed type hydraulic system, can handle 3-position-3-way selector valve 7 and make the pipeline connection (having adopted hyraulic controlled type 3-position-3-way selector valve among Fig. 2) of electricity liquid ratio relief valve 2 and described closed type hydraulic system low voltage side, thereby oil pressure relief by this electricity liquid ratio relief valve 2 of real-time regulated, can make a part of hydraulic oil flow oil sump tank 9 or cooler (not shown) in the described closed type hydraulic system working connection, to cool off.In this process, can carry out repairing to the working connection of described closed type hydraulic system simultaneously by slippage pump 4, to avoid occurring in the working connection phenomenon of hydraulic oil deficiency.Similarly, the above-mentioned second automatically controlled regulating type control valve 2 also is not limited to adopt the electricity liquid ratio relief valve 2 shown in Fig. 2, and it can also adopt servovalve or electromagnetic relief valve to replace, and this can realize application purpose of the present utility model equally.
Because in actual use, when the discharge capacity of working solution press pump 3 or rotating speed not simultaneously, needed repairing amount is also different with flushing dose, therefore the pressure dependence that can regulate the first automatically controlled regulating type control valve 1 and the second automatically controlled regulating type control valve 2 according to the discharge capacity or the rotating speed of working solution press pump 3 is so that repairing amount or flushing dose change on request.As mentioned above, in preferred implementation of the present utility model, by pressure oil circuit the first automatically controlled regulating type control valve 1 (electricity liquid ratio relief valve, servovalve or electromagnetic relief valve etc.) is housed at slippage pump 4, the second automatically controlled regulating type control valve 2 (electricity liquid ratio relief valve, servovalve or electromagnetic relief valve etc.) is housed in described hydraulic oil flush loop, thereby can carry out real-time regulated to the pressure of two valves according to the operating mode needs, with the pressure and the assignment of traffic of control slippage pump 4.Particularly, during work, can adjust the oil pressure relief of two valves 1,2 according to the operating mode needs.For example when system does not work, the pressure of the first automatically controlled regulating type control valve 1 (for example electricity liquid ratio relief valve of Fig. 2) can be transferred to minimumly, to reduce the power loss of slippage pump, reduce heating value; When the system oil temperature is too high, can reduce the pressure of the second automatically controlled regulating type control valve 2 (for example electricity liquid ratio relief valve of Fig. 2) or the pressure of raising valve 1, the flow by flushing valve is increased; Cross when low when the system oil temperature, can improve the pressure of the second automatically controlled regulating type control valve 2 or reduce the pressure of the first automatically controlled regulating type control valve 1, the flow by described flushing valve is reduced, reduce the cooling effect of system.
What can expect easily from the description of above-mentioned preferred implementation is, above-mentioned slippage pump pressure oil circuit or described flushing displacement oil circuit also can only select an oil circuit that electricity liquid ratio relief valve, servovalve or electromagnetic relief valve are installed, and can reach the pressure of control slippage pump 4 and the purpose of assignment of traffic equally like this.
Fig. 3 has shown another kind of preferred implementation of the present utility model, and this preferred implementation and mode of execution shown in Figure 2 are similar substantially, for fear of repetition, identical content are repeated no more.
Different with the mode of execution of Fig. 2 is, in the mode of execution of Fig. 3, in the feed circuit of slippage pump 4, be provided with solenoid directional control valve 5, be that the above-mentioned first automatically controlled regulating type control valve 1 adopts solenoid directional control valve 5 in Fig. 3, these solenoid directional control valve 5 inlets are connected on the output pipe 10 of slippage pump 4 by pipeline, and its outlet is communicated with (also can lead to other low pressure oil circuit) with fuel tank 9.When described closed type hydraulic system does not need repairing, can make the hydraulic oil of slippage pump 4 outputs directly flow back to fuel tank 9 or take back other low pressure oil circuit slippage pump 4 off-loads by this solenoid directional control valve 5.Relief valve in this feed circuit adopts manual tune formula relief valve 1 ', promptly this manual tune formula relief valve 1 ' and described solenoid directional control valve 5 are arranged in parallel between the output pipe 10 and fuel tank 9 (or other low pressure oil circuits) of slippage pump 4, and the relief valve in the hydraulic oil flush loop also adopts manual tune formula relief valve 2 ' in addition.The preferred implementation of Fig. 3 mainly can be according to the runnability of hydraulic system, realize the real-time off-load of slippage pump 4 by the first automatically controlled regulating type control valve 1 (being solenoid directional control valve 5) in Fig. 3, make the hydraulic oil of slippage pump 4 outputs directly flow back to fuel tank 9 or take back other low pressure oil circuit, promptly when closed type hydraulic system does not need repairing, in real time the oil compensation pressure of described slippage pump is adjusted to zero or be approximately zero, that is to say, this moment, whole hydraulic oil that slippage pump 4 is exported were discharged into fuel tank 9 or other low pressure oil circuits not to described closed type hydraulic system repairing.
By last description as can be known, closed type hydraulic system of the present utility model can be according to the runnability of system, control the oil compensation pressure and the assignment of traffic of slippage pump 4 in real time, thereby can reduce the power loss of hydraulic system effectively, reduce the bad temperature of hydraulic system and oil pump and rise.In preferred implementation of the present utility model, by pressure oil circuit the first automatically controlled regulating type control valve 1 (electricity liquid ratio relief valve, servovalve or electromagnetic relief valve etc.) is housed at slippage pump 4, the second automatically controlled regulating type control valve 2 (electricity liquid ratio relief valve, servovalve or electromagnetic relief valve etc.) is housed in described hydraulic oil flush loop, thereby can carry out aforesaid real-time regulated to the pressure of two valves according to the operating mode needs, with the pressure and the assignment of traffic of control slippage pump 4.Therefore, by above-mentioned closed type hydraulic system of the present utility model, can be flexibly the oil compensation pressure of real-time regulated slippage pump 4 and assignment of traffic effectively, make described closed type hydraulic system operate under the more optimum working state.
More than describe preferred implementation of the present utility model with reference to the accompanying drawings, but, the utility model be not limited to described in the above-mentioned explanation or accompanying drawing in shown detail, in technical conceive scope of the present utility model, can carry out various simple modification to the utility model.These simple variant all belong to protection domain of the present utility model.In addition, each technical characteristics described in the above-mentioned preferred implementation can carry out combination in any, to form selectable other mode of execution.Protection domain claim of the present utility model limits.
Claims (10)
1. closed type hydraulic system, this closed type hydraulic system comprises feed circuit, it is characterized in that, is connected with the first automatically controlled regulating type control valve (1 between the output pipe (10) of the slippage pump of described feed circuit (4) and the fuel tank (9); 5).
2. closed type hydraulic system according to claim 1, it is characterized in that, described feed circuit is arranged between the high pressure side pipeline and low voltage side pipeline of described closed type hydraulic system, this feed circuit comprises the unidirectional relief valve (8) of relative connection, each described unidirectional relief valve (8) comprises one-way valve and relief valve in parallel, the inlet of described slippage pump (4) is communicated with described fuel tank (9), and outlet is connected on the connecting pipeline between the described unidirectional relief valve (8) by described output pipe (10).
3. closed type hydraulic system according to claim 1 is characterized in that, the described first automatically controlled regulating type control valve (1; 5) be electricity liquid ratio relief valve, servovalve or electromagnetic relief valve.
4. closed type hydraulic system according to claim 1, it is characterized in that, described closed type hydraulic system also comprises flushing valve, this flushing valve comprises the 3-position-3-way selector valve (7) and the second automatically controlled regulating type control valve (2), two inlets of described 3-position-3-way selector valve (7) respectively with the high pressure side pipeline and the low voltage side pipeline connection of described closed type hydraulic system, the outlet of described 3-position-3-way selector valve (7) is communicated with the inlet of the described second automatically controlled regulating type control valve (2).
5. closed type hydraulic system according to claim 4 is characterized in that, the described second automatically controlled regulating type control valve (2) is electricity liquid ratio relief valve, servovalve or electromagnetic relief valve.
6. closed type hydraulic system according to claim 4 is characterized in that, the outlet of the described second automatically controlled regulating type control valve (2) is communicated with described fuel tank (9) or cooler.
7. closed type hydraulic system according to claim 4 is characterized in that, described 3-position-3-way selector valve (7) is a hyraulic controlled type 3-position-3-way selector valve.
8. closed type hydraulic system according to claim 1 is characterized in that, the described first automatically controlled regulating type control valve (1; 5) be solenoid directional control valve (5), this solenoid directional control valve (5) inlet is connected with described output pipe (10), outlet and described fuel tank or accordingly the low pressure oil circuit communicate, and between described output pipe (10) and described fuel tank (9) or low pressure oil circuit, also be provided with the manual regulating type relief valve (1 ') in parallel with described solenoid directional control valve (5).
9. according to each described closed type hydraulic system in the claim 1 to 8, it is characterized in that described slippage pump (4) is a gear pump.
10. according to each described closed type hydraulic system in the claim 1 to 8, it is characterized in that described slippage pump (4) is driven by same drive unit with the working solution press pump (3) of described closed type hydraulic system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202057533U CN201747703U (en) | 2010-05-25 | 2010-05-25 | Sealed hydraulic system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010202057533U CN201747703U (en) | 2010-05-25 | 2010-05-25 | Sealed hydraulic system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201747703U true CN201747703U (en) | 2011-02-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010202057533U Expired - Lifetime CN201747703U (en) | 2010-05-25 | 2010-05-25 | Sealed hydraulic system |
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| Country | Link |
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| CN (1) | CN201747703U (en) |
Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102312881A (en) * | 2011-08-22 | 2012-01-11 | 三一重工股份有限公司 | Flushing circuit of closed hydraulic system |
| CN102345653A (en) * | 2011-10-08 | 2012-02-08 | 中联重科股份有限公司 | Closed type hydraulic system and control method thereof |
| CN102392847A (en) * | 2011-12-10 | 2012-03-28 | 中铁隧道装备制造有限公司 | Novel hot oil replacement device of helical conveyer |
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| CN105201948A (en) * | 2015-10-30 | 2015-12-30 | 中联重科股份有限公司 | Flow self-adaption valve and closed type hydraulic system |
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| CN112065789A (en) * | 2020-09-11 | 2020-12-11 | 江苏省机械研究设计院有限责任公司 | Closed hydraulic system |
| CN114263656A (en) * | 2021-11-11 | 2022-04-01 | 中联重科股份有限公司 | Closed hydraulic system and mechanical equipment |
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2010
- 2010-05-25 CN CN2010202057533U patent/CN201747703U/en not_active Expired - Lifetime
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102312881A (en) * | 2011-08-22 | 2012-01-11 | 三一重工股份有限公司 | Flushing circuit of closed hydraulic system |
| CN102312881B (en) * | 2011-08-22 | 2014-07-30 | 三一重工股份有限公司 | Flushing circuit of closed hydraulic system |
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| WO2013049964A1 (en) * | 2011-10-08 | 2013-04-11 | 长沙中联重工科技发展股份有限公司 | Closed type hydraulic system and method for controlling same |
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Address after: 410013 No. 361 South silver basin, Hunan, Changsha Patentee after: ZOOMLION HEAVY INDUSTRY SCIENCE&TECHNOLOGY Co.,Ltd. Address before: 410013 No. 361 South silver basin, Hunan, Changsha Patentee before: CHANGSHA ZOOMLION HEAVY INDUSTRY SCIENCE AND TECHNOLOGY DEVELOPMENT Co.,Ltd. |
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Assignee: ZOOMLION MATERIAL HANDLING EQUIPMENT Co.,Ltd. Assignor: ZOOMLION HEAVY INDUSTRY SCIENCE&TECHNOLOGY Co.,Ltd. Contract record no.: 2012430000101 Denomination of utility model: Single-pump multi-motor closed hydraulic system and engineering machinery including same Granted publication date: 20110216 License type: Exclusive License Record date: 20120528 |
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