CN103470574A - Hydraulic oil-return device, hydraulic system and excavator - Google Patents
Hydraulic oil-return device, hydraulic system and excavator Download PDFInfo
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- CN103470574A CN103470574A CN2013103884029A CN201310388402A CN103470574A CN 103470574 A CN103470574 A CN 103470574A CN 2013103884029 A CN2013103884029 A CN 2013103884029A CN 201310388402 A CN201310388402 A CN 201310388402A CN 103470574 A CN103470574 A CN 103470574A
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Abstract
The invention relates to a hydraulic oil-return device, a hydraulic system and an excavator. The hydraulic oil-return device is characterized in that an oil-taking check valve is arranged on an oil-return oil circuit connected with a main valve, and an oil outlet of the oil-taking check valve is connected with a bypass check valve and a radiator which are in parallel connection, so that oil flowing out from the main valve is firstly decompressed via the oil-taking check valve to reduce oil-taking pressure of the radiator to have the same protected; in addition, the hydraulic oil-return device is further characterized by being provided with an oil-temperature control device, opening pressure of the bypass check valve is regulated according to oil temperature, when the oil temperature is higher, larger opening pressure can be set so as to allow the hydraulic oil to pass through the radiator as much as possible to have the oil temperature of an oil-return oil tank lowered and radiating effect improved; similarly, when the oil temperature is lower, the bypass check valve is controlled to be opened at the lower oil pressure so as to allow the hydraulic oil to pass through the bypass check valve as much as possible to improve use efficiency of the radiator, prolong the service life thereof, and improve practicability of the hydraulic oil-return device.
Description
Technical field
The present invention relates to the back pressure oil return technology of hydraulic system, particularly a kind of hydraulic oil-returning device and the hydraulic system and the excavator that are provided with this hydraulic oil-returning device.
Background technique
At present, in order to improve the back pressure of system, be convenient to hydraulic element and carry out the inlet pressure that repairing reduces radiator simultaneously, the protection radiator arranges in line check valve in hydraulic system; In order to prevent that radiator from stopping up faults such as making the too high damage hydraulic element of return pressure, arranges the bypass one-way valve in hydraulic system.
The common mode in the mounting point of in line check valve 03, bypass one-way valve 04 and radiator 02 is:
As shown in Figure 1, in line check valve 03 is installed on radiator 02 rear, bypass one-way valve 04 is connected with radiator 02 parallel way, hydraulic oil in the oil return circuit 01 be connected with the main valve return opening is inflow radiator 02 and bypass one-way valve 04 respectively, the fuel-displaced oil circuit of radiator 02 connects in line check valve 03 and flows into oil return fuel tank 05, and the fuel-displaced oil circuit of bypass one-way valve 04 flows into oil return fuel tank 05.
But in Fig. 1, the inlet pressure of radiator 02 is too high, easily damage radiator.When real work, in line check valve 01 and bypass one-way valve 04 are often opened simultaneously, make part hydraulic oil without radiator 03 directly via 04 oil return of bypass one-way valve to oil return fuel tank 05; The place high at temperature easily produces hydraulic oil high temperature, the place that temperature is low, and hydraulic oil heats up slower.
Therefore, in existing hydraulic oil-returning system, hydraulic oil easily damages radiator, and when oil pressure surpasses the bypass one-way valve part high temperature oil problem such as also can't be dispelled the heat, be those skilled in the art's technical problems urgently to be resolved hurrily.
Summary of the invention
In view of this, the present invention is intended to propose a kind of hydraulic oil-returning device, and to solve in existing hydraulic oil-returning system, hydraulic oil easily damages radiator, and when oil pressure surpasses the bypass one-way valve part high temperature oil problem such as also can't be dispelled the heat.
The present invention also provides hydraulic system and excavator, and to solve in its hydraulic oil-returning system, hydraulic oil easily damages radiator, and when oil pressure surpasses the bypass one-way valve part high temperature oil problem such as also can't be dispelled the heat.
On the one hand, the invention provides a kind of hydraulic oil-returning device, comprising:
The in line check valve be connected with the oil return circuit of main valve;
The radiator be connected with the oil outlet of described in line check valve;
In parallel with described radiator and be connected the bypass one-way valve of described in line check valve oil outlet;
For according to oil temperature, regulating the oil-temperature control device of the cracking pressure of described bypass one-way valve, it is connected with described bypass one-way valve.
Further, described oil-temperature control device comprises:
For measuring the temperature transducer of hydraulic fluid temperature in the oil return fuel tank be connected with described bypass one-way valve and radiator;
For described hydraulic fluid temperature being converted to the signal processor of current signal, it is connected with described temperature sensor signal;
For the solenoid valve according to described current signal regulation output pressure, it is connected with described signal processor signal and is connected with described bypass one-way valve.
Further, described solenoid valve is electromagnetic proportional valve; Described electromagnetic proportional valve is connected with described signal processor signal and is connected with described bypass one-way valve.
Further, the oil inlet end of described electromagnetic proportional valve connects the oil-feed oil circuit;
The oil outlet end of described electromagnetic proportional valve connects fuel-displaced oil circuit;
Described fuel-displaced oil circuit is connected to described bypass one-way valve.
Further, described bypass one-way valve is spring non-return valve;
The filler opening of described spring non-return valve is connected with the oil outlet of described in line check valve;
The oil outlet of described spring non-return valve connects the oil return fuel tank.
Further, be provided with spheroid in described spring non-return valve;
The corresponding described spring non-return valve filler opening of described ball valve one side, the corresponding spring chamber of described ball valve opposite side; Wherein, described spring non-return valve also comprises:
The control port be connected with described spring chamber;
Described control port is connected with the oil outlet end of described electromagnetic proportional valve.
Further, the cracking pressure of described in line check valve is 200 kPas.
Further, the cracking pressure of described bypass one-way valve is 400 kPas.
The present invention also provides a kind of hydraulic system, and described hydraulic system is provided with above-mentioned hydraulic oil-returning device.
The present invention also provides a kind of excavator, and described excavator is provided with above-mentioned hydraulic system.
Compared with prior art, beneficial effect of the present invention is as follows:
The invention provides a kind of hydraulic oil-returning device, hydraulic system and excavator, this hydraulic oil-returning device is by arranging in line check valve on the oil return circuit being connected with main valve, oil outlet in line check valve connects bypass one-way valve and the radiator be connected in parallel, the oil that main valve is flowed out is at first through the in line check valve decompression, to reduce the input pressure of radiator, the protection radiator; And, also be provided with oil-temperature control device on the bypass one-way valve, monitor oil temperature over after predetermined temperature at oil-temperature control device, the cracking pressure that increases the bypass one-way valve causes bypass one-way valve oil inlet quantity to reduce, so that the high temperature oil of oil return circuit is passed through radiator heat-dissipation as much as possible, reduce oil temperature in the oil return fuel tank, improve radiating effect; Equally, can be when oil temperature be low, control that bypass is unidirectional to be opened than under low oil pressure at valve, increase bypass one-way valve oil inlet quantity, improve radiator working life, improve the practicability of this hydraulic oil-returning device.
The accompanying drawing explanation
The structural representation that Fig. 1 is circuit apparatus for hydraulic of the prior art;
The structural representation of the circuit apparatus for hydraulic that Fig. 2 embodiment of the present invention provides;
The structure cross-sectional schematic of bypass one-way valve in the circuit apparatus for hydraulic that Fig. 3 embodiment of the present invention provides.
Description of reference numerals:
In Fig. 1:
01, oil return circuit; 02, radiator; 03, in line check valve; 04, bypass one-way valve; 05, oil return fuel tank;
In Fig. 2 and Fig. 3: 1, oil return circuit; 2, radiator; 3, in line check valve; 4, bypass one-way valve; 41, spheroid; 42, spring chamber; 43, control port; 5, oil return fuel tank.
Embodiment
In order to make those skilled in the art understand better technological scheme of the present invention, below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.It should be pointed out that the description to concrete structure and description order in this part are only the explanations to specific embodiment, should not be considered as that protection scope of the present invention is had to any restriction.
The main improvement of the embodiment of the present invention is, by the oil return circuit that changes main valve in original oil hydraulic circuit, first passes through radiator.The filler opening that first connects in line check valve by the oil return circuit by main valve, and connect again radiator at the oil outlet of in line check valve, not too large with the input pressure that guarantees radiator, and then do not affect working life of radiator; The oil outlet of in line check valve also is connected with the bypass one-way valve in parallel with radiator, and the bypass one-way valve also is connected with oil-temperature control device, though raise with the rising of the cracking pressure oil temperature that guarantees the bypass one-way valve, makes that in the oil return fuel tank, oil temperature can be too not high.
The concrete structure of the embodiment of the present invention is, as shown in Figure 2, a kind of hydraulic oil-returning device comprises: in line check valve 3, radiator 2, bypass one-way valve 4, oil return fuel tank 5 and oil-temperature control device; The oil return circuit 1 of main valve connects in line check valve 3 filler openings, and the oil outlet of in line check valve 3 connects radiator 2; Bypass one-way valve 4 connects in line check valve 3 oil outlets in parallel with radiator 2; Oil-temperature control device is connected with the oil return fuel tank with bypass one-way valve 4, and it regulates the cracking pressure of bypass one-way valve 4 according to oil temperature.
The present embodiment is preferred, and as shown in Figure 2, oil-temperature control device comprises: temperature transducer, signal processor and electromagnetic proportional valve; Temperature transducer is for measuring the interior hydraulic fluid temperature of oil return fuel tank 5; Signal processor is connected with temperature sensor signal, for receiving the temperature signal of temperature sensor monitors, and changes it into current signal; Electromagnetic proportional valve is connected with the signal processor signal, the current signal sent for receiving signal processor, and control its delivery pressure; Electromagnetic proportional valve is connected with bypass one-way valve 4, for regulating the cracking pressure of bypass one-way valve 4.
As shown in Figures 2 and 3, bypass one-way valve 4 is spring non-return valve, and this spring non-return valve comprises and is arranged on inner spheroid 41, the corresponding described spring non-return valve filler opening of spheroid 41 1 sides, the corresponding spring chambers 42 of spheroid 41 opposite sides; Wherein, spring non-return valve also comprises: the control port 43 be connected with spring chamber 42; Control port 43 is connected with the oil outlet end of electromagnetic proportional valve.
Its concrete regulating method is: the electromagnetic proportional valve oil inlet end connects oil-feed oil circuit (the oil-feed oil circuit of hydraulic system or oil-feed oil circuit independently, be not repeated herein); The fuel-displaced oil circuit of electromagnetic proportional valve oil outlet end is connected to the control port 43 of bypass one-way valve 4; The cracking pressure of bypass one-way valve 4 is the elastic force sum of pressure and bypass one-way valve 4 contained springs of the fuel-displaced oil circuit of electromagnetic proportional valve.
Oil temperature in temperature sensor monitors oil return fuel tank 5, oil temperature is passed to signal processor, signal processor is converted to current signal by temperature signal (or oil temperature signal), signal processor is sent to electromagnetic proportional valve by current signal, electromagnetic proportional valve is exported different pressure according to different current signals, thereby regulates the cracking pressure of bypass one-way valve 4.
The cracking pressure of bypass one-way valve is elastic force and the electromagnetic proportional valve delivery pressure sum of bypass check valve spring; Thereby the cracking pressure of bypass one-way valve 4 is with temperature variation in the oil return fuel tank.
During specific operation, the cracking pressure of in line check valve 3 can be 200 kPas.The spring of bypass one-way valve 4 is controlled cracking pressure can be 400 kPas.
The embodiment of the present invention also provides a kind of hydraulic system, and this hydraulic system is provided with the hydraulic oil-returning device of the above.Because above-mentioned hydraulic oil-returning device has above-mentioned technique effect, therefore, the hydraulic system that is provided with this hydraulic oil-returning device also should possess corresponding technique effect, and its specific implementation process is similar to the above embodiments, does not hereby repeat.
The embodiment of the present invention also provides a kind of excavator, and this excavator is provided with the hydraulic system of the above.Because above-mentioned hydraulic system has above-mentioned technique effect, therefore, the excavator that is provided with this hydraulic system also should possess corresponding technique effect, and its specific implementation process is similar to the above embodiments, does not hereby repeat.
The foregoing is only preferred embodiment of the present invention, in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. a hydraulic oil-returning device is characterized in that: comprising:
The in line check valve (3) be connected with the oil return circuit (1) of main valve;
The radiator (2) be connected with the oil outlet of described in line check valve (3);
In parallel with described radiator (2) and be connected the bypass one-way valve (4) of described in line check valve (3) oil outlet;
For according to oil temperature, regulating the oil-temperature control device of the cracking pressure of described bypass one-way valve (4), it is connected with described bypass one-way valve (4).
2. hydraulic oil-returning device as claimed in claim 1, it is characterized in that: described oil-temperature control device comprises:
For measuring the temperature transducer of the interior hydraulic fluid temperature of oil return fuel tank (5) be connected with described bypass one-way valve (4) and radiator (2);
For described hydraulic fluid temperature being converted to the signal processor of current signal, it is connected with described temperature sensor signal;
For the solenoid valve according to described current signal regulation output pressure, it is connected with described signal processor signal and is connected with described bypass one-way valve (4).
3. hydraulic oil-returning device as claimed in claim 2, it is characterized in that: described solenoid valve is electromagnetic proportional valve; Described electromagnetic proportional valve is connected with described signal processor signal and is connected with described bypass one-way valve (4).
4. hydraulic oil-returning device as claimed in claim 3, is characterized in that: the oil inlet end connection oil-feed oil circuit of described electromagnetic proportional valve;
The oil outlet end of described electromagnetic proportional valve connects fuel-displaced oil circuit;
Described fuel-displaced oil circuit is connected to described bypass one-way valve (4).
5. hydraulic oil-returning device as claimed in claim 4, it is characterized in that: described bypass one-way valve (4) is spring non-return valve;
The filler opening of described spring non-return valve is connected with the oil outlet of described in line check valve (3);
The oil outlet of described spring non-return valve connects oil return fuel tank (5).
6. hydraulic oil-returning device as claimed in claim 5, is characterized in that: be provided with spheroid (41) in described spring non-return valve;
The corresponding described spring non-return valve filler opening of described spheroid (41) one sides, the corresponding spring chamber (42) of described spheroid (41) opposite side; Wherein, described spring non-return valve also comprises:
The control port (43) be connected with described spring chamber (42);
Described control port (43) is connected with the oil outlet end of described electromagnetic proportional valve.
7. hydraulic oil-returning device as described as any one in claim 1-6, it is characterized in that: the cracking pressure of described in line check valve (3) is 200 kPas.
8. hydraulic oil-returning device as claimed in claim 7, it is characterized in that: the cracking pressure of described bypass one-way valve (4) is 400 kPas.
9. a hydraulic system is characterized in that: described hydraulic system is provided with as hydraulic oil-returning device as described in claim 1-8 any one.
10. an excavator, it is characterized in that: described excavator is provided with hydraulic system as claimed in claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103884029A CN103470574A (en) | 2013-08-30 | 2013-08-30 | Hydraulic oil-return device, hydraulic system and excavator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013103884029A CN103470574A (en) | 2013-08-30 | 2013-08-30 | Hydraulic oil-return device, hydraulic system and excavator |
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| CN103470574A true CN103470574A (en) | 2013-12-25 |
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| CN2013103884029A Pending CN103470574A (en) | 2013-08-30 | 2013-08-30 | Hydraulic oil-return device, hydraulic system and excavator |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103912540A (en) * | 2014-04-14 | 2014-07-09 | 三一重机有限公司 | Hydraulic oil temperature control system and engineering machinery |
| CN104454801A (en) * | 2014-10-09 | 2015-03-25 | 中联重科股份有限公司渭南分公司 | Hydraulic oil temperature control system and method |
| CN106523476A (en) * | 2016-06-13 | 2017-03-22 | 柳州柳工挖掘机有限公司 | Integrated hydraulic oil radiator |
| CN107217700A (en) * | 2017-07-27 | 2017-09-29 | 苏州蓝王机床工具科技有限公司 | A kind of excavator return oil pressure control loop |
| CN111520377A (en) * | 2020-05-19 | 2020-08-11 | 上海三一重机股份有限公司 | Hydraulic heat dissipation control system, method, device, equipment and engineering machinery |
| CN113216313A (en) * | 2021-06-25 | 2021-08-06 | 三一重机有限公司 | Hydraulic control system of breaking hammer and excavator |
| CN113864277A (en) * | 2021-10-29 | 2021-12-31 | 三一重机有限公司 | Check valve, flow overload protection hydraulic system and operation machine |
| CN117404362A (en) * | 2023-12-15 | 2024-01-16 | 中联重科土方机械有限公司 | Hydraulic oil return system and excavator |
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| CN201301466Y (en) * | 2008-11-13 | 2009-09-02 | 贵州詹阳动力重工有限公司 | Rotary oil supply loop for hydraulic excavator |
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| CN202689078U (en) * | 2012-06-26 | 2013-01-23 | 合肥振宇工程机械有限公司 | Oil return control mechanism of hydraulic system of excavator |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103912540A (en) * | 2014-04-14 | 2014-07-09 | 三一重机有限公司 | Hydraulic oil temperature control system and engineering machinery |
| CN104454801A (en) * | 2014-10-09 | 2015-03-25 | 中联重科股份有限公司渭南分公司 | Hydraulic oil temperature control system and method |
| CN106523476A (en) * | 2016-06-13 | 2017-03-22 | 柳州柳工挖掘机有限公司 | Integrated hydraulic oil radiator |
| CN107217700A (en) * | 2017-07-27 | 2017-09-29 | 苏州蓝王机床工具科技有限公司 | A kind of excavator return oil pressure control loop |
| CN111520377A (en) * | 2020-05-19 | 2020-08-11 | 上海三一重机股份有限公司 | Hydraulic heat dissipation control system, method, device, equipment and engineering machinery |
| CN113216313A (en) * | 2021-06-25 | 2021-08-06 | 三一重机有限公司 | Hydraulic control system of breaking hammer and excavator |
| CN113864277A (en) * | 2021-10-29 | 2021-12-31 | 三一重机有限公司 | Check valve, flow overload protection hydraulic system and operation machine |
| CN117404362A (en) * | 2023-12-15 | 2024-01-16 | 中联重科土方机械有限公司 | Hydraulic oil return system and excavator |
| CN117404362B (en) * | 2023-12-15 | 2024-03-15 | 中联重科土方机械有限公司 | Hydraulic oil return system and excavator |
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Application publication date: 20131225 |