CN104088862A - Oil pump preheating system, hydraulic drive system and engineering machine - Google Patents
Oil pump preheating system, hydraulic drive system and engineering machine Download PDFInfo
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- CN104088862A CN104088862A CN201410317418.5A CN201410317418A CN104088862A CN 104088862 A CN104088862 A CN 104088862A CN 201410317418 A CN201410317418 A CN 201410317418A CN 104088862 A CN104088862 A CN 104088862A
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Abstract
The invention discloses an oil pump preheating system, a hydraulic drive system and an engineering machine. The oil pump preheating system comprises at least one working oil pump, a preheating oil storage body, a temperature rising hydraulic component and a preheating power oil pump. An oil suction opening of the preheating power oil pump is connected to the preheating oil storage body, an oil outlet is connected to a first oil drainage port of each working oil pump, and a second oil drainage port and an oil suction opening of each working oil pump are connected to the preheating oil storage body. The temperature rising hydraulic component is arranged on an oil line between the oil outlet of the preheating power oil pump and the corresponding first oil drainage port or is arranged on an oil line between the corresponding second oil drainage port and the preheating oil storage body. By the adoption of the oil pump preheating system, the hydraulic drive system and the engineering machine, the viscosity of hydraulic oil can be effectively lowered, the oil suction resistance of the working oil pumps is reduced, the working oil pumps can be effectively preheated, kinematic pairs in the working oil pumps can be subjected to sufficient lubrication, frictional resistance is lowered, in this way, the resistance of the working oil pumps can be overall effectively lowered in the starting process and at the operating initial stage, and therefore the phenomenon that an engine cannot be started easily due to overloading can be effectively avoided.
Description
Technical field
The present invention relates to oil pump preheating technology field, particularly a kind of oil pump pre-heating system, hydraulic driving system and engineering machinery.
Background technique
At present, common engineering machinery generally adopts hydraulic driving system, for example, in hoister in large tonnage, generally adopts the multiple work oil pumps of driven by engine (oil pump group), forms the hydraulic driving system of getting on the bus.Particularly, as shown in Figure 1, get on the bus in hydraulic driving system at this, in oil pump group 30, the line shaft of each work oil pump is connected with motor 10 by transfer case 20; In course of normal operation, motor 10 starts running, and power, after transfer case 20 transmits, drives the running of the each work oil pump of oil pump group 30, thereby completes the action of getting on the bus accordingly.
But, such scheme exists major defect, for example, in the time that ambient temperature is lower (as subzero 20 DEG C or lower), the viscosity of hydraulic oil increases, cause (hydraulic oil that depends on internal leakage is lubricated) insufficient lubrication between the kinematic pair in work oil pump on the one hand and surface friction drag is sharply increased, cause on the other hand work oil pump oil suction difficulty (increase of oil suction resistance), these extra drag effect are on motor, add that the startability of motor under low temperature environment declines to some extent, thereby very easily cause engine cranking motor because of normally ato unit of overload.
In order to address the above problem, in prior art, generally between motor and transfer case, clutch is set, when use first by throw-out-of clutch, carry out motor heat engine by independent ato unit, contribute to so suitably to improve the startability of motor, improve the toggle speed of motor, but, after motor heat engine completes, again by clutch in conjunction with time, act on motor again because the viscosity of hydraulic oil increases the various additional friction that produce, and then there will be again motor to be difficult to the normal phenomenon starting.
Therefore, how improving for above-mentioned deficiency and defect, is those skilled in the art's technical problems urgently to be resolved hurrily.
Summary of the invention
In view of this, one of object of the present invention is to provide a kind of oil pump pre-heating system, effectively to reduce the viscosity of hydraulic oil, and simultaneously can preheating work oil pump, the service behaviour of raising work oil pump, thus can avoid motor in the time of the work of drive oil pump, to be difficult to the problem starting because load is excessive.
Particularly, this oil pump pre-heating system comprises at least one work oil pump, preheating oil storage body, intensification hydraulic element and preheating power oil pump, wherein: the inlet port of described preheating power oil pump is connected to described preheating oil storage body, oil outlet is connected to the first drain tap of described work oil pump, and the second drain tap of described work oil pump is connected to described preheating oil storage body; Described intensification hydraulic element are arranged on the oil circuit between the oil outlet of described preheating power oil pump and the first drain tap of described work oil pump, or are arranged on the oil circuit between the second drain tap and the described preheating oil storage body of described work oil pump.
Further, described intensification hydraulic element are orifice valve.
Further, described intensification hydraulic element are arranged in described preheating oil storage body.
Further, described oil pump pre-heating system also comprises fuel tank, and described preheating oil storage body is thermal insulation pipe, and the volume of described thermal insulation pipe is less than the volume of described fuel tank, and described thermal insulation pipe is communicated with described fuel tank; And/or the inlet port of the oil pump of working described at least one is connected to described preheating oil storage body.
Further, described intensification hydraulic element are arranged on the oil circuit between the oil outlet of described preheating power oil pump and the first drain tap of described work oil pump, on oil circuit on oil circuit between described intensification hydraulic element and the first drain tap of described work oil pump and/or between oil outlet and the described intensification hydraulic element of described preheating power oil pump, side is connected to relief valve, and the flow-off of described relief valve is connected to described preheating oil storage body.
Further, described intensification hydraulic element are arranged on the oil circuit between the oil outlet of described preheating power oil pump and the first drain tap of described work oil pump; On oil circuit between the oil outlet of described preheating power oil pump and described intensification hydraulic element, be provided with break-make selector valve, and/or, on the oil circuit between the first drain tap of described work oil pump and described intensification hydraulic element, be provided with one-way valve.
Another object of the present invention is to provide a kind of hydraulic driving system, effectively to reduce the starting load of motor, realize the normal startup of motor under low temperature environment.
Particularly, this hydraulic driving system comprises the oil pump pre-heating system described in motor, transfer case and above-mentioned any one, and wherein, described work oil pump is multiple, and the oil pump of working described in each is in transmission connection by described transfer case and described motor.
Further, between described motor and described transfer case, be provided with clutch.
Further, be provided with power taking mouth on described motor, the line shaft of described preheating power oil pump is connected with described power taking mouth by power take-off.
The 3rd object of the present invention is to provide a kind of engineering machinery, effectively to improve the service behaviour of engineering machinery under low temperature environment.
Particularly, this project machinery is provided with the hydraulic driving system described in above-mentioned any one.
In oil pump pre-heating system of the present invention, utilize the housing of work oil pump to have the advantages that at least two drain taps and each drain tap communicate, and two drain taps are connected to form to oil hydraulic circuit with preheating oil storage body and preheating power oil pump respectively, and on this oil hydraulic circuit, be provided with intensification hydraulic element, form preheating oil hydraulic circuit capable of circulation, in use, when in low temperature environment, the running of preheating power oil pump, inhalant liquid force feed from preheating oil storage body, the hydraulic oil pumping enters into the housing of work oil pump through the first drain tap, turn back in preheating oil storage body through the second drain tap afterwards, owing to being also provided with intensification hydraulic element on oil hydraulic circuit, therefore, the every circulation primary of hydraulic oil, the temperature of hydraulic oil will rise, after circulation a period of time, oil temperature in preheating oil storage body and the oil temperature in oil hydraulic circuit will effectively improve, and then can effectively reduce the viscosity of hydraulic oil, thereby can carry out preheating to work oil pump, make sufficient lubrication between the kinematic pair in work oil pump, effectively reduce surface friction drag, work (machinery) performance of raising work oil pump, effectively reduce so on the whole work oil pump in the time starting and the resistance of start of run, thereby can effectively avoid motor in the time of the work of drive oil pump, to be difficult to the problem starting because load is excessive.
In the preferred implementation of one of oil pump pre-heating system of the present invention, oil pump pre-heating system also comprises fuel tank, and preheating oil storage body is thermal insulation pipe, and the volume of thermal insulation pipe is less than the volume of fuel tank, and thermal insulation pipe is communicated with fuel tank; And/or the inlet port of the oil pump of working described at least one is connected to preheating oil storage body.Adopt after this scheme at least one technique effect that can be achieved as follows: one, can effectively improve the warming velocity of hydraulic oil, realize good oil pump pre-heat effect with less cycle-index; Two, can reduce the oil suction resistance of relevant work oil pump, further reduce work oil pump in the time starting and the resistance of start of run.
In the preferred implementation of one of hydraulic driving system of the present invention, each work oil pump is in transmission connection by transfer case and motor, between motor and transfer case, be provided with clutch, and preheating power oil pump can be by power take-off power taking from motor, adopt after this scheme, in use, clutch can be arranged to disengaged position, the rapid heat engine of motor is realized to be started, drive the running of preheating power oil pump simultaneously, hydraulic oil is heated up rapidly, and then effectively reduce hydraulic pressure oil viscosity, and the hydraulic oil after heating up during this period can carry out preheating to work oil pump, the service behaviour of work oil pump is effectively improved, again clutch is arranged to jointing state afterwards, because the oil suction resistance of work oil pump effectively reduces, the existing effect of service behaviour improves, thereby, after clutch engages, motor can cannot not complete because of overload normal startup, and this mode will effectively improve the starting efficiency of motor under low temperature environment.
Brief description of the drawings
The accompanying drawing that forms a part of the present invention is used to provide a further understanding of the present invention, and schematic description and description of the present invention is used for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the structural representation of a kind of hydraulic driving system in prior art;
The principle schematic of a kind of oil pump pre-heating system that Fig. 2 provides for the embodiment of the present invention.
Major label description in figure:
10 motors
20 transfer cases
30 oil pump groups
1 work oil pump
2 one-way valves
3 relief valves
4 preheating oil storage bodies
5 fuel tanks
6 stop valves
7 preheating power oil pump
8 break-make selector valves
9 intensification hydraulic element
Embodiment
It should be pointed out that in this part, the description to concrete structure and description order is only the explanation to specific embodiment, should not be considered as that protection scope of the present invention is had to any restriction.In addition,, under the situation of not conflicting, the feature in embodiment and embodiment in this part can combine mutually.
Please refer to Fig. 2, below in conjunction with accompanying drawing, the embodiment of the present invention is elaborated.
As shown in the figure, the oil pump pre-heating system of the embodiment of the present invention can comprise multiple work oil pumps 1, preheating oil storage body 4, fuel tank 5, intensification hydraulic element 9 and preheating power oil pump 7, wherein:
The inlet port of preheating power oil pump 7 is connected to preheating oil storage body 4, and oil outlet is connected to the first drain tap t1 of each work oil pump 1, and the second drain tap t2 of the oil pump 1 of respectively working is connected to preheating oil storage body 4; In the present embodiment, intensification hydraulic element 9 are arranged on the oil circuit between oil outlet and the first drain tap t1 of preheating power oil pump 7, and intensification hydraulic element 9 preferably adopt orifice valve.
The inlet port a1 of at least one work oil pump 1 is connected to preheating oil storage body 4, this work oil pump 1 can obtain hydraulic oil from preheating oil storage body 4 like this, the inlet port a1 that the first two (from left to right) work oil pump 1 has been shown in Fig. 2 is directly connected to preheating oil storage body 4, and two work oil pumps 1 are in addition connected to form closed circuit with two motors respectively; Be understandable that, the hydraulic oil of these two closed circuits also can be from preheating oil storage body 4, the oiler that is the repairing oil-feed oil circuit of these two closed circuits can be connected to preheating oil storage body 4 (not shown)s, that is two other work oil pumps 1 can obtain hydraulic oil by mode indirectly from preheating oil storage body 4.It should be noted that, where, respectively the practical significance that is connected to work oil pump and each motor as for the oil outlet of the first two work oil pump 1 all relevant with concrete application scenarios, and this part content can not affect the clear of the present embodiment and present, thereby does not specifically launch at this.Separately, in the present embodiment, preheating oil storage body 4 is preferably thermal insulation pipe, and thermal insulation pipe refers to the body that can prevent to a certain extent internal-external heat exchange, and the volume of this thermal insulation pipe is less than the volume of fuel tank 5, and one end of this thermal insulation pipe is communicated with fuel tank 5.
Each drain tap of considering work oil pump 1 communicates, therefore, the drain tap communicating passage of preheating oil storage body 4, preheating power oil pump 7, intensification hydraulic element 9 and work oil pump 1 enclosure interior will form a preheating oil hydraulic circuit capable of circulation on the whole, and the working principle of the oil pump pre-heating system of above-described embodiment is described below in conjunction with concrete using process.
In use, when ambient temperature lower (as subzero 20 DEG C or lower) time, can make preheating power oil pump 7 turn round, preheating power oil pump 7 is inhalant liquid force feed from preheating oil storage body 4 (thermal insulation pipe), and the hydraulic oil pumping is through intensification hydraulic element 9, the first drain tap t1 enters into the housing of work oil pump 1, turn back in preheating oil storage body 4 through the second drain tap t2 output afterwards, like this, hydraulic oil is every circulation primary in preheating oil hydraulic circuit, the temperature of hydraulic oil is by rising certain value, when after circulation a period of time, oil temperature in oil temperature and preheating oil hydraulic circuit in preheating oil storage body 4 will effectively improve, and then can effectively reduce the viscosity of hydraulic oil, thereby can either carry out preheating to work oil pump, make sufficient lubrication between the kinematic pair in work oil pump, effectively reduce surface friction drag, work (machinery) performance of raising work oil pump 1, can also reduce the oil suction resistance of working oil 1 pump that obtains pressure oil from preheating oil storage body 4, effectively reduce so on the whole work oil pump in the time starting and the resistance of start of run, thereby the problem that can effectively avoid the motor that drives work oil pump 1 to be difficult to startup because of load excessive (overload).In addition, the fuel tank 5 larger due to volume has neither part nor lot in warm-up cycle, but adopt volume preheating oil storage body 4 less and that there is certain heat-blocking action to participate in warm-up cycle and for 1 oil suction of work oil pump, thereby can effectively improve the warming velocity of hydraulic oil, and then can realize good oil pump pre-heat effect with less cycle-index (i.e. shorter time), thereby realize rapidly the minimizing of startup and running resistance.
It should be noted that, in specific implementation process, the oil pump pre-heating system of above-described embodiment can also adopt following at least one preferred version:
One, shown in Figure 2, intensification hydraulic element 9 (as orifice valve) can be arranged in preheating oil storage body 4, intensification hydraulic element 9 produce heat and can continue to distribute in preheating oil storage body 4 like this, thereby can make the oil temperature fast rise further in preheating oil storage body 4 and in preheating oil hydraulic circuit, and can prevent like this heat loss in vain, also more environmental protection.
Two, shown in Figure 2, the other relief valve 3 that is connected on can the oil circuit on the oil circuit between intensification hydraulic element 9 and the first drain tap t1 and/or between oil outlet and the intensification hydraulic element 9 of preheating power oil pump 7, the flow-off of relief valve 3 is connected to preheating oil storage body 4, like this, oil pressure on oil circuit between oil pressure on the oil circuit that not only can avoid heating up between hydraulic element 9 and the first drain tap t1 and/or oil outlet and the intensification hydraulic element 9 of preheating power oil pump 7 is excessive and relevant hydraulic element are caused to damage, and hydraulic oil (oil temperature will rise) after relief valve 3 is got back in preheating oil storage body 4, to further improve pre-heat effect.
Three, can on the oil circuit between the oil outlet of preheating power oil pump 7 and intensification hydraulic element 9, be provided with break-make selector valve 8, for example, as shown in Figure 2, this break-make selector valve 8 can adopt 2/2-way solenoid valve, wherein, the filler opening of this 2/2-way valve is connected to the oil outlet of preheating power oil pump 7, return opening sealing, two actuator ports are connected to respectively filler opening and other oil circuits of intensification hydraulic element 9, so in use, by controlling the oil circuit break-make between oil outlet and the intensification hydraulic element 9 of state control preheating power oil pump 7 of break-make selector valve 8, to determine whether that work oil pump 1 and hydraulic oil are carried out to preheating, be understandable that, break-make selector valve 8 can also adopt other forms, as long as can realize the oil circuit break-make between oil outlet and the intensification hydraulic element 9 of preheating power oil pump 7.
Four, shown in Figure 2, can on the oil circuit between the first drain tap t1 and the oil outlet of intensification hydraulic element 9 of work oil pump 1, one-way valve 2 be set, can prevent that like this hydraulic oil (can play lubrication) in the housing of work oil pump 1 from refluxing and affecting other hydraulic element or the internal lubrication of the oil pump 1 of working from the first drain tap t1.
Five, shown in Figure 2, can in the communicating passage between preheating oil storage body 4 and fuel tank 5, stop valve 6 be set, so in use, in the time that needs carry out preheating to work oil pump 1 and hydraulic oil, stop valve 6 can be closed, hydraulic oil exchange between preheating oil storage body 4 and fuel tank 5 is disconnected, contribute to so the oil temperature of further accelerating preheating oil storage body 4 and preheating oil hydraulic circuit to improve speed, thereby reach better pre-heat effect.
It should be noted that, in above-described embodiment and various preferred implementation thereof, the preferred orifice valve of intensification hydraulic element 9, but in other embodiments, be not limited to this, consider that a lot of hydraulic element all can produce certain temperature rise at hydraulic oil through later as hydrovalves such as Flow valve, throttle valve or relief valves, thereby intensification hydraulic element also can adopt these hydrovalves.
It should be noted that, in above-mentioned various embodiment and various preferred implementation thereof, intensification hydraulic element 9 are preferably arranged on the oil circuit between the oil outlet of preheating power oil pump 7 and the first drain tap t1 of work oil pump 1, but in other embodiments, be not limited to this, for example, intensification hydraulic element 9 can also be arranged on the oil circuit between the second drain tap t2 and preheating oil storage body 4, so also can form preheating oil hydraulic circuit.
It should be noted that, in above-mentioned various embodiment and various preferred implementation thereof, adopt the scheme of fuel tank 5 and preheating oil storage body 4 simultaneously, and preheating oil storage body 4 is thermal insulation pipe, the volume of thermal insulation pipe is less than the volume of fuel tank 5, thermal insulation pipe is communicated with fuel tank 5, so be both convenient to reach corresponding pre-heat effect, also be convenient to be conducive to the cooling of hydraulic oil when without preheating, but in other embodiments, also can omit fuel tank 5, further, preheating oil storage body 4 also can not adopt the form of thermal insulation pipe, for example, preheating oil storage body can also be a fuel tank that volume is less, this mode also can realize corresponding pre-heat effect.
It will be understood by those skilled in the art that, under a lot of situations, in multiple drain taps of oil pump, generally only have one to play a role, conventionally Way out drain tap is upward connected to fuel tank, and other drain taps are shut, the hydraulic oil that can ensure like this internal leakage remains in the housing of oil pump as far as possible, to play lubricated effect; Correspondingly, in this application, the second drain tap t2 is preferably Way out drain tap upward, and the first drain tap t1 is preferably Way out drain tap down.
Other a kind of embodiments of the present invention also provide a kind of hydraulic driving system, this hydraulic driving system comprises the oil pump pre-heating system described in motor, transfer case and above-mentioned any embodiment, wherein, described work oil pump is multiple, and the oil pump of working described in each is in transmission connection by described transfer case and described motor.From above, this hydraulic driving system can effectively reduce work oil pump in the time starting and the resistance of start of run, thereby can effectively avoid motor to be difficult to because load is excessive start in the time of the work of drive oil pump.
In implementation process, this hydraulic driving system can also adopt following preferred version.For example, can between motor and transfer case, clutch be set, by the state of solenoidoperated cluthes, can make the first heat engine of motor, and realize preheating at each work oil pump and hydraulic oil and turned round by driven by engine work oil pump again after reducing load effect, can avoid like this motor because overload cannot complete normal startup, improve the starting efficiency of motor under low temperature environment.And for example, on motor, can be provided with power taking mouth, the line shaft of preheating power oil pump can be connected in this power taking mouth (from this power taking mouth power taking) by power take-off, so in use, clutch can be arranged to disengaged position, the rapid heat engine of motor is realized to be started, drive the running of preheating power oil pump (owing to adopting the needs that can meet preheating compared with the preheating power oil pump of small dimension simultaneously, thereby motor can drive this preheating power oil pump easily), hydraulic oil is heated up rapidly, and then effectively reduce hydraulic pressure oil viscosity, and the hydraulic oil after heating up during this period can carry out preheating to work oil pump, the service behaviour of work oil pump is effectively improved, again clutch is arranged to jointing state afterwards, because the oil suction resistance of work oil pump effectively reduces, the existing effect of service behaviour improves, thereby, after clutch engages, motor can cannot not complete because of overload normal startup, after adopting in this way, without configuring extra power source for preheating power oil pump 7, and realize the normal operation of motor under low temperature environment in improving motor utilization ratio.
The present invention is other another kind of embodiments also provide a kind of engineering machinery, as hoist, this project is mechanically provided with above-mentioned any hydraulic driving system, for example, the hydraulic driving system of getting on the bus of this project machinery adopts the hydraulic driving system of this form, because above-mentioned hydraulic driving system has above-mentioned technique effect, therefore, the service behaviour of this project machinery under low temperature environment effectively improves, the specific implementation process of its appropriate section is similar to the above embodiments, the specific implementation process of other parts can be referring to the associated description of prior art, hereby do not 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 amendment of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (10)
1. an oil pump pre-heating system, is characterized in that, comprises at least one work oil pump (1), preheating oil storage body (4), intensification hydraulic element (9) and preheating power oil pump (7), wherein:
The inlet port of described preheating power oil pump (7) is connected to described preheating oil storage body (4), oil outlet is connected to first drain tap (t1) of described work oil pump (1), and second drain tap (t2) of described work oil pump (1) is connected to described preheating oil storage body (4);
Described intensification hydraulic element (9) are arranged on the oil circuit between the oil outlet of described preheating power oil pump (7) and first drain tap (t1) of described work oil pump (1), or are arranged on the oil circuit between the second drain tap (t2) and the described preheating oil storage body (4) of described work oil pump (1).
2. oil pump pre-heating system as claimed in claim 1, is characterized in that, described intensification hydraulic element (9) are orifice valve.
3. oil pump pre-heating system as claimed in claim 1, is characterized in that, described intensification hydraulic element (9) are arranged in described preheating oil storage body (4).
4. the oil pump pre-heating system as described in claims 1 to 3 any one, it is characterized in that, described oil pump pre-heating system also comprises fuel tank (5), described preheating oil storage body (4) is thermal insulation pipe, the volume of described thermal insulation pipe is less than the volume of described fuel tank (5), and described thermal insulation pipe is communicated with described fuel tank (5); And/or the inlet port of the oil pump (1) of working described at least one is connected to described preheating oil storage body (4).
5. the oil pump pre-heating system as described in claims 1 to 3 any one, it is characterized in that, described intensification hydraulic element (9) are arranged on the oil circuit between the oil outlet of described preheating power oil pump (7) and first drain tap (t1) of described work oil pump (1), the other relief valve (3) that is connected on oil circuit on oil circuit between first drain tap (t1) of described intensification hydraulic element (9) and described work oil pump (1) and/or between oil outlet and the described intensification hydraulic element (9) of described preheating power oil pump (7), the flow-off of described relief valve (3) is connected to described preheating oil storage body (4).
6. the oil pump pre-heating system as described in claims 1 to 3 any one, it is characterized in that, described intensification hydraulic element (9) are arranged on the oil circuit between the oil outlet of described preheating power oil pump (7) and first drain tap (t1) of described work oil pump (1); On oil circuit between the oil outlet of described preheating power oil pump (7) and described intensification hydraulic element (9), be provided with break-make selector valve (8), and/or, on the oil circuit between the first drain tap (t1) and the described intensification hydraulic element (9) of described work oil pump (1), be provided with one-way valve (2).
7. a hydraulic driving system, it is characterized in that, comprise the oil pump pre-heating system described in motor, transfer case and claim 1 to 6 any one, wherein, described work oil pump (1) is multiple, and the oil pump (1) of working described in each is in transmission connection by described transfer case and described motor.
8. hydraulic driving system as claimed in claim 7, is characterized in that, between described motor and described transfer case, is provided with clutch.
9. hydraulic driving system as claimed in claim 8, is characterized in that, is provided with power taking mouth on described motor, and the line shaft of described preheating power oil pump (7) is connected with described power taking mouth by power take-off.
10. an engineering machinery, is characterized in that, is provided with the hydraulic driving system described in claim 7 to 9 any one in described engineering machinery.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410317418.5A CN104088862B (en) | 2014-07-04 | 2014-07-04 | Oil pump pre-heating system, fluid power system and engineering machinery |
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|---|---|---|---|
| CN201410317418.5A CN104088862B (en) | 2014-07-04 | 2014-07-04 | Oil pump pre-heating system, fluid power system and engineering machinery |
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| CN104088862A true CN104088862A (en) | 2014-10-08 |
| CN104088862B CN104088862B (en) | 2016-08-24 |
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| CN105114399A (en) * | 2015-07-15 | 2015-12-02 | 宁波力维机械科技有限公司 | Hydraulic oil preheating device |
| CN107620339A (en) * | 2016-07-13 | 2018-01-23 | 斗山工程机械（中国）有限公司 | Control system, method and the excavator of engine start |
| CN111336146A (en) * | 2020-03-18 | 2020-06-26 | 中国商用飞机有限责任公司 | Method for operating an electric pump for an aircraft hydraulic system |
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| CN111336146A (en) * | 2020-03-18 | 2020-06-26 | 中国商用飞机有限责任公司 | Method for operating an electric pump for an aircraft hydraulic system |
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|---|---|
| CN104088862B (en) | 2016-08-24 |
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