CN103062163B - Hydraulic oil degassing system - Google Patents
Hydraulic oil degassing system Download PDFInfo
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- CN103062163B CN103062163B CN201310015395.8A CN201310015395A CN103062163B CN 103062163 B CN103062163 B CN 103062163B CN 201310015395 A CN201310015395 A CN 201310015395A CN 103062163 B CN103062163 B CN 103062163B
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Abstract
The invention discloses a hydraulic oil degassing system which comprises a pressure oil source for providing hydraulic oil and an oil tank for recycling hydraulic oil. A throttle device is disposed between the hydraulic oil source and the oil tank. After hydraulic oil flows through the throttle device, gas in the hydraulic oil can be separated. The degassing system further comprises a degassing device which can discharge the gas separated from the hydraulic oil. An energy accumulator is disposed between the pressure oil source and the throttle device. Therefore, when the hydraulic oil flows through the throttle device, pressure difference occurs between an inlet and an outlet of the throttle device to allow gas voids to occur in the hydraulic oil, gas separation occurs, the gas separated is discharged by the degassing device, and accordingly the gas in the hydraulic oil is removed. The provided energy accumulator can provide the throttle device with high instantaneous flow and better create front and rear pressure ratio for the throttle device to allow for easier occurrence of gas voids in the hydraulic oil, gas separation is increased, and the degassing system is more effective.
Description
Technical field
The present invention relates to the field of degassing of hydraulic oil, particularly, relate to a kind of degassing system of hydraulic oil.
Background technique
Along with Hydraulic Field is in the deep development of industry-by-industry, hydraulic oil is as the medium of transferring power, and the impact of quality on real work of its character is larger.Especially usually can be dissolved with air in hydraulic oil, this can impact hydraulic system at work.Wherein, at normal temperatures and pressures, the air content of hydraulic oil is about 6%.In hydraulic oil, the content of air has larger impact to its Young's modulus: air content is larger, and its Young's modulus is less, and the rigidity of hydraulic system will decline.In the element such as hydrovalve and oil hydraulic pump, due to the reason such as low pressure and Strong shear, the dissolved gas in fluid is separated out and produces bubble or air pocket, even causes hydraulic element to cavitate under certain condition, and produces noise.Further, the existence of air pocket also makes the flow characteristic of fluid become complicated.Therefore, needed before the use of hydraulic oil its process of degassing.
In the prior art, in order to reduce the air content in hydraulic oil, technological scheme main at present has:
(1) airtight hydraulic oil container is vacuumized, the gas evolution in forced fluid force feed, then the gas discharging of precipitation is gone out hydraulic oil container; But in this approach, air speed of separating out is comparatively slow, and bubble floating to be made to go out the hydraulic oil needs wait longer time;
(2) density due to hydraulic pressure bubble in oil is comparatively a lot of at the bottom of hydraulic oil, therefore has and by centrifugal force, the bubble in hydraulic oil is separated with hydraulic oil, then discharged by separated gas with oil guide pipe.But, in kind of method, use centrifugal force to make the scheme of hydraulic oil and gas separaion can only get rid of bubble in hydraulic oil, but the gas evolution dissolving in hydraulic oil can not be forced;
(3) use ultrasonic on-line air removing device, control hyperacoustic frequency and size, realize ultrasound to the gas bubble removal effect in fluid.But the one side cost of this method is higher, its using scope is restricted on the other hand.
Therefore, it is possible to provide a kind of structure simple and the good technological scheme of effect of degassing of hydraulic oil has positive effect.
Summary of the invention
The object of this invention is to provide a kind of degassing system of hydraulic oil, this system architecture is simple, and effect of degassing is better.
To achieve these goals, the invention provides a kind of degassing system of hydraulic oil, described degassing system comprises for providing the pressure oil-source of described hydraulic oil and the fuel tank for reclaiming described hydraulic oil, throttling arrangement is provided with between described pressure oil-source and described fuel tank, can make to be dissolved in the gas evolution in described hydraulic oil after described hydraulic oil flows through described throttling arrangement, and described degassing system also comprises the device that degass can discharging the gas of separating out from described hydraulic oil, wherein, accumulator is provided with between described pressure oil-source and described throttling arrangement.
Preferably, described throttling arrangement comprises the throttle orifice flow through for described hydraulic oil, and lays respectively at inducer and the outlet section of this throttle orifice import and outlet, and the passage section of described outlet section is greater than the passage section of described inducer.
Preferably, described outlet section is flared structure, and the passage section of this flared structure outwards becomes large gradually from the outlet of described throttle orifice.
Preferably, described throttling arrangement comprises the throttle orifice flow through for described hydraulic oil, and this throttle orifice is multiple.
Preferably, the device that degass described in is be serially connected in the oil purifier between described throttling arrangement and described fuel tank.
Preferably, the setting pressure of described accumulator can make the ratio of the inlet and outlet pressure of described throttling arrangement be greater than air pocket threshold value, wherein, the air pocket making gas evolution is produced after the ratio equaling the described inlet and outlet pressure of this air pocket threshold value can make described hydraulic oil flow through described throttling arrangement.
Preferably, described degassing system comprises the first working state and the second working state, in described first working state, described accumulator is communicated with described pressure oil-source and disconnects with described throttling arrangement and is communicated with, in described second working state, described accumulator and described pressure oil-source disconnect and are communicated with and are communicated with described throttling arrangement.
Preferably, described degassing system also comprises the 3rd working state, and in the 3rd working state, described accumulator and described pressure oil-source all disconnect with described throttling arrangement and being communicated with, and are communicated with oil return fuel tank.
Preferably, described degassing system also comprises switching valve and switch valve, and described switching valve is arranged between described accumulator and pressure oil-source, and described switch valve is arranged between described accumulator and described throttling arrangement.
Preferably, described switching valve is three-position valve, at the meta of this three-position valve, described accumulator disconnects with described pressure oil-source and being communicated with, and in the left position of this three-position valve, described accumulator is communicated with described pressure oil-source, in the right position of this three-position valve, described accumulator is communicated with oil return fuel tank.
Preferably, described degassing system also comprises controller and the first detection device, described first detection device can detect the energy-storage pressure of described accumulator and feed back to described controller, when this energy-storage pressure equals the setting pressure of described accumulator, described controller controls described accumulator and disconnects with described pressure oil-source and be communicated with and be communicated with described throttling arrangement.
Preferably, described degassing system comprises controller and second detection device, described second detection device can detect the inlet and outlet pressure of described throttling arrangement respectively and feed back to described controller, when the ratio of this inlet and outlet pressure is less than air pocket threshold value, described controller controls described accumulator and is communicated with described pressure oil-source and disconnects with described throttling arrangement and be communicated with.
Pass through technique scheme, when the present invention flows through throttling arrangement by hydraulic oil, pressure reduction can be formed in the import and export of throttling arrangement, and due to throttling arrangement outlet pressure less, therefore hydraulic oil can produce cavitation after flowing through throttling arrangement, namely there is gas evolution, then then the gas of separating out can be discharged by the device that degass, the gas in hydraulic oil can be removed.Wherein owing to being employed herein accumulator, larger instantaneous flow can be provided for throttling arrangement, and set up the front and back pressure ratio of throttling arrangement better and the easier air pocket that occurs in hydraulic oil, to increase gassing volume, thus degassing system provided by the invention is made to realize the good gas removal of effect by simple structure.
Other features and advantages of the present invention are described in detail in embodiment part subsequently.
Accompanying drawing explanation
Accompanying drawing is used to provide a further understanding of the present invention, and forms a part for specification, is used from explanation the present invention, but is not construed as limiting the invention with embodiment one below.In the accompanying drawings:
Fig. 1 is the structure principle chart of the degassing system of the hydraulic oil that the preferred embodiment for the present invention provides;
Fig. 2 is the partial structurtes schematic diagram of the throttling arrangement that the preferred embodiment for the present invention provides.
Description of reference numerals
1 pressure oil-source 2 throttling arrangement
3 fuel tank 4 accumulators
5 degas device 6 switching valve
7 switch valve 8 controllers
11 relief valve 91 first detection devices
92 second detection device 3 ' oil return fuel tanks
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in detail.Should be understood that, embodiment described herein, only for instruction and explanation of the present invention, is not limited to the present invention.
First it should be explained that, the present invention is in order to realize degassing of hydraulic oil, employ the principle of the throttle orifice both sides pressure reduction in fluid mechanics, wherein hydraulic oil is after flowing through throttle orifice, reduce due to pressure thus can cavitation be produced, thus the gas be dissolved in hydraulic oil is separated out from hydraulic oil, discharge so that follow-up.The ratio of the inlet and outlet pressure of hydraulic oil generation air pocket wherein can be made to be called air pocket threshold value in the present invention, and this air pocket threshold value is conventionally known to one of skill in the art, usually desirable 3.5.That is, the inlet pressure of throttling arrangement is 3.5 times of outlet pressure, and the hydraulic oil now flowing through throttle orifice cavitation can occur.Wherein it will be appreciated by persons skilled in the art that, when the parameters such as temperature are different, this value can change.Therefore, in the present invention, as long as the air pocket threshold value of hydraulic oil generation air pocket can be made all should to drop in protection scope of the present invention.This is by inquiry: " [1] Fu Xin; Du Xuewen. the air pocket observation in valve port flow at high speed and flow field analysis. Hydraulics and pneumatics; 2006; (7): 29-31. " or " [2] Zuo Jianmin. hydraulic and pneumatic transmission (the 3rd edition). China Machine Press; 2005; 43. " etc. the document that can know of those skilled in the art obtain, the present invention does not do this and too much repeats.
It should be noted that in addition, only show hydraulic schematic diagram in Fig. 1 of the present invention, for a person skilled in the art, identical hydraulic connecting principle can be realized by various different mechanical entities structure.Therefore, term involved in the present invention should not be limited to its dictionary meanings, but should be the implication that art technology people can understand.
As shown in Figure 1, the degassing system of a kind of hydraulic oil provided by the invention, this degassing system comprises for providing the pressure oil-source 1 of hydraulic oil and the fuel tank 3 for Ethylene recov force feed, wherein, pressure oil-source 1 can be oil hydraulic pump as shown in the figure, can also the oil sources that hydraulic oil is provided known to any those skilled in the art, in addition in order to ensure security of system, otherly in the oil passage of oil hydraulic pump can connect a relief valve 11 be communicated with oil return fuel tank 3 ', using the use of the safety valve as whole system, wherein well known, after the pressure of system exceedes the setting pressure of relief valve 11, the hydraulic oil of system can flow back to oil return fuel tank 3 ' by this relief valve in case locking system generation booster, the accidents such as leakage.Wherein as pressure oil-source 1 oil hydraulic pump can from this oil return fuel tank 3 ' oil suction so that the hydraulic oil in this oil return fuel tank 3 ' is carried out process of degassing, in other embodiments can also from specific fuel tank oil suction to carry out the process of degassing of related fluid force feed, hydraulic oil can reclaimed by the fuel tank 3 in the present invention, to be carried out the use of follow-up hydraulic transmission operation after process of degassing.
In order to realize object of the present invention, namely, effectively can remove the dissolved gases in hydraulic oil, throttling arrangement 2 is provided with between pressure oil-source 1 and fuel tank 3, therefore, the hydraulic oil flowing through this throttling arrangement 2 can by throttling arrangement throttling, thus make the outlet pressure of throttling arrangement 2 be less than inlet pressure, namely, cavitation can be there is after hydraulic oil flows through throttling arrangement 2, to make the gas evolution be dissolved in hydraulic oil, and degassing system provided by the invention also comprises the device 5 that degass can discharging the gas of separating out from hydraulic oil, therefore, can realize degassing process to dissolved gases in hydraulic oil.Wherein especially, in order to increase the amount of precipitation of gas, ensure the generation of cavitation, in the present invention, be provided with accumulator 4 between pressure oil-source 1 and throttling arrangement 2, the accumulator 4 therefore after accumulation of energy operationally for throttling arrangement 2 provides larger instantaneous flow, can increase the hydraulic fluid flow rate flowing through throttling arrangement 2, to increase the inlet and outlet pressure ratio of throttling arrangement, guarantee the air pocket threshold value that this inlet and outlet pressure is more above-mentioned than reaching.
Wherein preferably, the setting pressure of accumulator 4 can make the ratio of the inlet and outlet pressure of throttling arrangement 2 be greater than air pocket threshold value (namely aforesaid 3.5), to increase the cavitation effect of hydraulic oil further, thus effectively increase the amount of precipitation of gas, promote the gas removal effect of hydraulic oil.Therefore, adopt in a preferred embodiment of the invention first by pressure oil-source 1 to accumulator 4 accumulation of energy, then provided the control mode of hydraulic oil to throttling arrangement 2 by accumulator 4, make the operability of degassing system provided by the invention and practicability stronger.
It should be noted that, the mode of execution that can realize technique scheme has multiple, the structure of such as throttling arrangement, the control mode etc. of degassing system.The present invention is in this introduction preferred implementation wherein for convenience of description, and this preferred implementation, only for illustration of the present invention, is not limited to the present invention.
As shown in Figure 2, in a preferred embodiment of the invention, in order to increase further system degas process efficiency, increase the hydraulic oil quantity of single treatment, throttle orifice included by throttling arrangement 2 provided by the invention is multiple, the plurality of throttle orifice can flow through throttling arrangement 2 for multiply hydraulic oil simultaneously, thus increases the working efficiency of system.Wherein, throttling arrangement 2 provided by the present invention can be provided by various ways; such as formed by the throttle orifice group in Fig. 2; in addition in other NM mode of executions; can also provide or adopt the form such as short tube, thin long eyelet group to provide by the throttle orifice of various valve member; in addition, the throttling arrangement can expected for other those skilled in the art also all should drop in protection scope of the present invention.
In throttling arrangement 2 as shown in Figure 2, in order to increase gassing volume further, preferably, throttling arrangement 2 comprises the inducer 22 and outlet section 23 that lay respectively at throttle orifice 21 import and outlet, wherein, the passage section of outlet section 23 is greater than the passage section of inducer 22.Namely can increase low pressure area, make more gas evolution, more preferably, this outlet section 23 is flared structure, and the passage section of this flared structure outwards becomes large gradually from the outlet of throttle orifice 21.Thus make the hydraulic oil flowing through throttling arrangement 2 have larger low pressure area, the gassing volume in this low pressure area can be improved.Make efficiency and the better effects if of degassing system provided by the invention.
In addition, in order to better the gas of separating out from hydraulic oil be discharged, preferably, degas device 5 for being serially connected in the oil purifier between throttling arrangement 2 and fuel tank 3, and wherein this oil purifier is the well-known components in related domain, and it can make the gas of separating out from hydraulic oil, even if small gas all can be filtered off, thus through gas evolution process hydraulic oil inflow fuel tank 3 before, just separated out gas is all discharged, effectively can increase the effect of degassing of degassing system.In addition; in other NM mode of executions; the mode of such as carrying out negative pressure ventilation in fuel tank can also be adopted to carry out the removal of gas; other mode of the discharge can expected for this type of or gas those skilled in the art also should fall as in protection scope of the present invention, and the present invention does not limit this.
Above describe the working principle of degassing system provided by the invention, the control principle in real work of degassing system provided by the invention will be introduced in detail below.
First, due to the existence of accumulator 4, in order to make the working efficiency of system higher, preferably first can carry out the accumulation of energy operation of accumulator, now degassing system enters the first working state, wherein, in the first working state, accumulator 4 is communicated with pressure oil-source 1 and disconnects with throttling arrangement 2 and is communicated with, thus realize by pressure oil-source 1 pair of accumulator 4 fuel feeding, accumulator 4 is made to carry out accumulation of energy, after accumulator 4 pressure accumulation power reach setting pressure, now system can enter in the second working state, wherein, accumulator 4 disconnects with pressure oil-source 1 and is communicated with and is communicated with throttling arrangement 2, thus by accumulator 4, hydraulic oil is supplied to throttling arrangement 2, make the precipitation of the gas in hydraulic oil.And the underpressure of the hydraulic oil provided when accumulator 4 produces cavitation after making hydraulic oil flow through throttling arrangement 2, then reentering the first working state is accumulator 4 accumulation of energy.So, the process of degassing continuously that above-mentioned two processes can realize hydraulic oil is repeated.
In addition, preferably, after the process of degassing of all hydraulic oil to be done, accumulator 4 can be carried out off-load process, now degassing system enters the 3rd working state, and in the 3rd working state, accumulator 4 and pressure oil-source 1 all disconnect with throttling arrangement 2 and being communicated with, and be communicated with oil return fuel tank 3 ', thus realize the off-load of accumulator 4.
It should be noted that, the mode of structure that can complete this control procedure has multiple, particularly, as shown in Figure 1, degassing system can comprise switching valve 6 and switch valve 7, switching valve 6 is arranged between accumulator 4 and pressure oil-source 1, and switch valve 7 is arranged between accumulator 4 and throttling arrangement 2, to complete the switching of above-mentioned three working staties by coordinating.
Wherein, preferably, above-mentioned three kinds of different working staties are completed in order to make accumulator 4, preferably, switching valve 6 is three-position valve, at the meta of this three-position valve, accumulator 4 disconnects with pressure oil-source 1 and being communicated with, now can carry out the second working state of degassing system, in the left position of this three-position valve, accumulator 4 is communicated with pressure oil-source 1, now can carry out the first working state of degassing system, in the right position of this three-position valve, accumulator is communicated with oil return fuel tank 3 ', now can carry out the 3rd working state of degassing system.More preferably; this three-position valve is M type three position four-way directional control valve; in addition for the valve members such as the three position four-way directional control valve of accumulator 4 off-load or other three six-way transfer valves can be prevented during the meta such as O type, should can also drop on equally in protection scope of the present invention for this type of distortion.
Below in conjunction with the preferred embodiment for the present invention as shown in Figure 1, specifically introduce the control procedure of degassing system provided by the invention.Wherein, degassing system provided by the invention can realize automatically controlling, and can switching valve 6 and switch valve 7 be preferably now solenoid directional control valve, and be electrically connected with following controller 8, with the corresponding valve member action of the control Current Control exported by controller 8.
Particularly, degassing system also comprises controller 8 and the first detection device 91, first detection device 91 can detect the energy-storage pressure of accumulator 4 and feed back to controller 8, it is such as the other pressure transducer be connected between accumulator 4 and switch valve 7, when this sensor judgement energy-storage pressure now equals the setting pressure of accumulator 4, show that accumulator 4 accumulation of energy completes, now, controller 8 controls accumulator 4 and disconnects with pressure oil-source 1 and be communicated with and be communicated with throttling arrangement 2.Particularly, control switching valve 6 and be switched to meta, and switch valve 7 is opened, to realize by accumulator 4 as throttling arrangement 2 provides hydraulic oil.
In addition, degassing system also comprises second detection device 92, second detection device 92 can detect the inlet and outlet pressure of throttling arrangement 2 respectively and feed back to controller 8, such as be connected between switch valve 7 and throttling arrangement 2 and side is connected on pressure transducer between throttling arrangement 2 and fuel tank 3 for other respectively, when controller 8 is by calculating and judging that the ratio of the inlet and outlet pressure of throttling arrangement 2 is less than air pocket threshold value, then show that the delivery pressure of accumulator 4 is not enough to make hydraulic oil produce air pocket after flowing through throttling arrangement 2, this Time Controller 8 controls accumulator 4 and is communicated with pressure oil-source 1 and disconnects with throttling arrangement 2 and be communicated with.Particularly, control switch valve 7 cuts out, and switching valve 6 is switched to left position, and now realizing by pressure oil-source 1 is accumulator 4 accumulation of energy.
In addition, in order to realize the 3rd above-mentioned working state, then can preset off-load pattern in controller 8, after all hydraulic oil carries out degassing and is disposed, enable this pattern, this Time Controller 8 can be closed by control switch valve 7, and switching valve 6 is switched to right position, makes the residue fluid in accumulator 4 flow back through oil return fuel tank 3 ' off-load.
More than introduce working principle and the control principle of degassing system provided by the invention, the gas that can be completed in hydraulic oil by this degassing system is removed quickly and efficiently, therefore, the degassing system of the hydraulic oil of body of the present invention has higher practicability and promotional value.
Below the preferred embodiment of the present invention is described in detail by reference to the accompanying drawings; but; the present invention is not limited to the detail in above-mentioned mode of execution; within the scope of technical conceive of the present invention; can carry out multiple simple variant to technological scheme of the present invention, these simple variant all belong to protection scope of the present invention.
It should be noted that in addition, each concrete technical characteristics described in above-mentioned embodiment, in reconcilable situation, can be combined by any suitable mode, in order to avoid unnecessary repetition, the present invention illustrates no longer separately to various possible compound mode.
In addition, also can carry out combination in any between various different mode of execution of the present invention, as long as it is without prejudice to thought of the present invention, it should be considered as content disclosed in this invention equally.
Claims (11)
1. the degassing system of a hydraulic oil, it is characterized in that, described degassing system comprises for providing the pressure oil-source of described hydraulic oil (1) and the fuel tank (3) for reclaiming described hydraulic oil, throttling arrangement (2) is provided with between described pressure oil-source (1) and described fuel tank (3), described hydraulic oil can make to be dissolved in the gas evolution in described hydraulic oil after flowing through described throttling arrangement (2), and described degassing system also comprises the device that degass (5) can discharging the gas of separating out from described hydraulic oil, wherein, accumulator (4) is provided with between described pressure oil-source (1) and described throttling arrangement (2), described degassing system comprises the first working state and the second working state, in described first working state, described accumulator (4) is communicated with described pressure oil-source (1) and disconnects with described throttling arrangement (2) and is communicated with, in described second working state, described accumulator (4) and described pressure oil-source (1) disconnect and are communicated with and are communicated with described throttling arrangement (2).
2. degassing system according to claim 1, it is characterized in that, described throttling arrangement (2) comprises the throttle orifice (21) flow through for described hydraulic oil, and laying respectively at inducer (22) and the outlet section (23) of (21) import of this throttle orifice and outlet, the passage section of described outlet section (23) is greater than the passage section of described inducer (22).
3. degassing system according to claim 2, is characterized in that, described outlet section (23) is flared structure, and the passage section of this flared structure outwards becomes large gradually from the outlet of described throttle orifice (21).
4. degassing system according to claim 1, is characterized in that, described throttling arrangement (2) comprises the throttle orifice (21) flow through for described hydraulic oil, and this throttle orifice (21) is for multiple.
5. degassing system according to claim 1, is characterized in that, described in degas device (5) for being serially connected in the oil purifier between described throttling arrangement (2) and described fuel tank (3).
6. degassing system according to claim 1, it is characterized in that, the setting pressure of described accumulator (4) can make the ratio of the inlet and outlet pressure of described throttling arrangement (2) be greater than air pocket threshold value, wherein, the ratio equaling the described inlet and outlet pressure of this air pocket threshold value can make described hydraulic oil flow through described throttling arrangement (2) and produce the air pocket making gas evolution afterwards.
7. degassing system according to claim 1, it is characterized in that, described degassing system also comprises the 3rd working state, in the 3rd working state, described accumulator (4) and described pressure oil-source (1) all disconnect with described throttling arrangement (2) and being communicated with, and are communicated with oil return fuel tank (3 ').
8. the degassing system according to claim 1 or 7, it is characterized in that, described degassing system also comprises switching valve (6) and switch valve (7), described switching valve (6) is arranged between described accumulator (4) and pressure oil-source (1), and described switch valve (7) is arranged between described accumulator (4) and described throttling arrangement (2).
9. degassing system according to claim 8, it is characterized in that, described switching valve (6) is three-position valve, at the meta of this three-position valve, described accumulator (4) disconnects with described pressure oil-source (1) and being communicated with, and in the left position of this three-position valve, described accumulator (4) is communicated with described pressure oil-source (1), in the right position of this three-position valve, described accumulator (4) is communicated with oil return fuel tank (3 ').
10. degassing system according to claim 8, it is characterized in that, described degassing system also comprises controller (8) and the first detection device (91), described first detection device (91) can be detected the energy-storage pressure of described accumulator (4) and feed back to described controller (8), when this energy-storage pressure equals the setting pressure of described accumulator (4), described controller (8) controls described accumulator (4) and disconnects with described pressure oil-source (1) and be communicated with and be communicated with described throttling arrangement (2).
11. degassing systems according to claim 8, it is characterized in that, described degassing system comprises controller (8) and second detection device (92), described second detection device (92) can detect the inlet and outlet pressure of described throttling arrangement (2) respectively and feed back to described controller (8), when the ratio of this inlet and outlet pressure is less than air pocket threshold value, described controller (8) controls described accumulator (4) and is communicated with described pressure oil-source (1) and disconnects with described throttling arrangement (2) and be communicated with.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018036889A1 (en) * | 2016-08-25 | 2018-03-01 | Robert Bosch Gmbh | Hydraulic device for degassing and dewatering a hydraulic oil |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102013209108A1 (en) * | 2013-05-16 | 2014-11-20 | Robert Bosch Gmbh | hydraulic power unit |
| DE102014222510A1 (en) * | 2014-11-04 | 2016-05-04 | Robert Bosch Gmbh | Device for degassing a hydraulic fluid |
| CN110185676A (en) * | 2019-06-05 | 2019-08-30 | 深圳市粤永能源环保科技有限公司 | A kind of pure water hydraulics system |
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| CN103062163A (en) | 2013-04-24 |
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