CN103511403B - Hydraulic cooling system and there is its engineering machinery - Google Patents
Hydraulic cooling system and there is its engineering machinery Download PDFInfo
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- CN103511403B CN103511403B CN201310479650.4A CN201310479650A CN103511403B CN 103511403 B CN103511403 B CN 103511403B CN 201310479650 A CN201310479650 A CN 201310479650A CN 103511403 B CN103511403 B CN 103511403B
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Abstract
The present invention discloses a kind of hydraulic cooling system, comprise pump (10), cooling motor (20), the cooling fan (30) of running is driven by cooling motor (20), oil-feed oil circuit (22) between the oil outlet being connected to cooling motor (20) and pump (10) and the oil return circuit (24) be connected between cooling motor (20) and fuel tank (T0), it is characterized in that, described oil-feed oil circuit (22) is provided with the pilot operated directional control valve (40) that a spool aperture is adjustable, described pilot operated directional control valve (40) comprises the hydraulic control end A and hydraulic control end B that are positioned at its opposite end, the oil inlet P be communicated with the oil outlet of described pump (10), the actuator port a be communicated with cooling motor (20) and the actuator port b be connected with other working oil path (26), described hydraulic cooling system also comprises and to be connected with described hydraulic control end B and to make the temperaturing control pressure device that the pressure of hydraulic control end B changes with hydraulic fluid temperature.Hydraulic cooling system provided by the invention has cooling and as required refrigerating function in advance concurrently, can effectively utilize the power of hydraulic system to cool hydraulic oil, energy-conservation, good in economic efficiency.
Description
Technical field
The present invention relates to technical field of hydraulic pressure, particularly relate to hydraulic cooling system and there is its engineering machinery.
Background technique
Hydraulic Power Transmission System is commonly used to engineering machinery field, and hydraulic system can produce amount of heat under long working state, and hydraulic oil temperature is raised.Cool as required for realizing hydraulic oil temperature, hydraulic system is provided with hydraulic pressure cooling circuit usually, for the cooling capacity of the hydraulic pressure cooling circuit often worked regulates automatically with hydraulic oil temperature, keep hydraulic oil temperature all the time in suitable temperature range, just need the rotating speed automatically regulating the fan in cooling circuit according to hydraulic oil temperature, realize cooling as required, with energy-saving and cost-reducing in good time.
Refer to Fig. 1, Fig. 1 is existing hydraulic pressure cooling circuit, the cooling fan 40 ' comprising metering pump 10 ', be connected to the oil outlet of metering pump 10 ' and the electromagnetic relief valve 20 ' between fuel tank, the one-way valve 22 ' in parallel with described electromagnetic relief valve 20 ', fixed displacement motor 30 ' and driven by this fixed displacement motor 30 '.This hydraulic pressure cooling circuit is provided with temperature transducer, the switching electricity of the control end of electromagnetic relief valve 20 ' is controlled by this temperature transducer, and then control fixed displacement motor 30 ' drive cooling fan 40 ' rotation or do not rotate, but the temperature variant flow of fixed displacement motor 30 ' can not be controlled, can not cool as required according to hydraulic oil temperature in good time, and to the hydraulic system be often operated under low-speed heave-load operating mode, system heating value is large, does not have to adopt the method cooled in advance to cool in advance hydraulic system.
Summary of the invention
The technical problem to be solved in the present invention be to provide a kind of have concurrently refrigerating function in advance and as required refrigerating function hydraulic cooling system and there is its engineering machinery.
Hydraulic cooling system provided by the invention, comprise pump, cooling motor, the cooling fan of running is driven by described cooling motor, oil-feed oil circuit between the oil outlet being connected to described cooling motor and described pump and the oil return circuit be connected between described cooling motor and fuel tank, described hydraulic cooling system comprises the pilot operated directional control valve be arranged on described oil-feed oil circuit, described pilot operated directional control valve comprises the hydraulic control end A and hydraulic control end B that are positioned at its opposite end, the oil inlet P be communicated with the oil outlet of described pump, the actuator port a be communicated with cooling motor, and the actuator port b to be connected with other working oil path in the hydraulic system with this hydraulic cooling system, described pilot operated directional control valve comprises the first working position that described oil inlet P is communicated with described actuator port a and the second working position that described oil inlet P is communicated with actuator port b with described actuator port a simultaneously, described hydraulic cooling system also comprises the temperaturing control pressure device be connected with described hydraulic control end B, during described hydraulic control end A draining, described pilot operated directional control valve is in the first working position, and the hydraulic oil that described pump exports rotates to drive described cooling fan at full speed through cooling motor, is in the state of cooling in advance, and described hydraulic control end A and hydraulic control end B all not draining time, described temperaturing control pressure device controls the size of the pressure of described hydraulic control end B according to the temperature of hydraulic oil in described hydraulic cooling system, switch between the first working position and the second working position to control described pilot operated directional control valve, thus regulate the spool aperture size of described pilot operated directional control valve (40), and then change the flow that hydraulic oil that described pump exports exports cooling motor to and rotate by different rotating speeds to drive described cooling fan, be in the state of cooling as required.
Preferably, described hydraulic control end A is communicated with described oil inlet P by first guide's oil circuit, and described first guide's oil circuit is also connected with described fuel tank by a switch valve; Described hydraulic control end B is communicated with described oil inlet P by second guide's oil circuit, and described temperaturing control pressure device is connected with described second guide's oil circuit.
Preferably, described switch valve is solenoid directional control valve, described solenoid directional control valve comprises the first working position being communicated with described first guide's oil circuit and fuel tank and the second working position blocking the oil circuit between first guide's oil circuit and fuel tank, described solenoid directional control valve is positioned at the first working position, and described hydraulic cooling system is in the state of cooling in advance; Described solenoid directional control valve is positioned at the second working position, and described hydraulic cooling system is in the state of cooling as required.
Preferably, described first guide's oil circuit is provided with first throttle valve, and one end of described first throttle valve is connected with described oil inlet P, and the other end of described first throttle valve is connected on the oil circuit between hydraulic control end A and switch valve; Second guide's oil circuit is provided with second throttle, and one end of described second throttle is connected with described oil inlet P, and the other end of described second throttle is connected on the oil circuit between hydraulic control end B and temperaturing control pressure device.
Preferably, described temperaturing control pressure device is temp-control type relief valve, and the oil inlet end of described temp-control type relief valve is connected to described second guide's oil circuit, and the oil outlet end of described temp-control type relief valve is connected to fuel tank; Described temp-control type relief valve comprises one and presets temperature control value, and when the temperature of hydraulic oil is less than described default temperature control value, temp-control type relief valve is in overflow situation always, and described pilot operated directional control valve is in the second working position, described cooling fan low-speed running; When the temperature of hydraulic oil is more than or equal to described default temperature control value, the spool aperture of described temp-control type relief valve is adjustable, reduced along with the rising of hydraulic fluid temperature by the flow of this temp-control type relief valve overflow to fuel tank to control described second guide's oil circuit, the rotating speed of described cooling fan increases gradually along with the rising of hydraulic fluid temperature.
Preferably, described temperaturing control pressure device is temp-control type switch valve, and the oil inlet end of described temp-control type switch valve is connected to described second guide's oil circuit, and the oil outlet end of described temp-control type switch valve is connected to fuel tank; Described temp-control type switch valve comprises one and presets temperature control value, when the temperature of hydraulic oil is less than described default temperature control value, temp-control type switch valve is in the first working position of described second guide's oil circuit and described fuel tank connected state always, described pilot operated directional control valve is in the second working position, described cooling fan low-speed running; When the temperature of hydraulic oil is more than or equal to described default temperature control value, described temp-control type switch valve is in the second adjustable working position of spool aperture, the flow flowing to fuel tank by this temp-control type switch valve to control described second guide's oil circuit reduces along with the rising of hydraulic fluid temperature, and the rotating speed of described cooling fan increases gradually along with the rising of hydraulic fluid temperature.
Preferably, described cooling motor is reversing motor, be provided with selector valve between described pilot operated directional control valve and cooling motor, described oil-feed oil circuit is optionally communicated with a wherein hydraulic fluid port of described cooling motor, to control turning to of described cooling fan by described selector valve.
Preferably, described selector valve is solenoid directional control valve, the actuator port d that described solenoid directional control valve comprises filler opening, return opening, the actuator port c be connected with wherein one end of described cooling motor and is connected with the wherein the other end of described cooling motor, described solenoid directional control valve comprises filler opening and to be communicated with actuator port c and the first working position of being communicated with fuel tank of return opening and filler opening are communicated with actuator port d and the second working position of being communicated with fuel tank of return opening.
Preferably, the oil-feed oil circuit between described pilot operated directional control valve and cooling motor is provided with one-way overflow valve, the filler opening of described one-way overflow valve is connected with described oil-feed oil circuit, and the oil outlet of described one-way overflow valve is communicated with described oil return circuit or fuel tank.
The present invention also provides a kind of engineering machinery, comprise Working mechanism and drive the hydraulic work system of this Working mechanism, described hydraulic work system comprises the first oil sources to drive described Working mechanism work, this project machinery also comprises above-mentioned hydraulic cooling system, and other working oil path described are any operative oil circuit for described Working mechanism fuel feeding in described hydraulic work system; When described pilot operated directional control valve is in the second working position, described pump collaborates to collaborate fuel feeding for described Working mechanism by described pilot operated directional control valve and described first oil sources.
When the present invention is by hydraulic control end A draining, pilot operated directional control valve is made to be in the first working position, now no matter to the control of hydraulic control end B how described temperaturing control pressure device, the pressure oil that pump all can be made to export almost all enters cooling motor and then drives cooling fan full-speed operation, now, the in advance cooling irrelevant with hydraulic fluid temperature can be realized; In addition, when hydraulic control end A and hydraulic control end B all not draining time, by described temperaturing control pressure device control described hydraulic control end B pressure so that control described pilot operated directional control valve spool aperture and control pilot operated directional control valve switch between the first working position and the second working position, control the flow being entered cooling motor by pilot operated directional control valve, realize the control of hydraulic fluid temperature to cooling motor oil inlet quantity, make the rotating speed of cooling fan relevant with hydraulic fluid temperature, realize cooling in real time as required, energy-conservation, good in economic efficiency.
Accompanying drawing explanation
Fig. 1 is the hydraulic pressure cooling circuit diagram of prior art;
Fig. 2 is the hydraulic cooling system schematic diagram of the embodiment of the present invention;
Fig. 3 is the temperaturing control pressure device schematic diagram of another embodiment of the present invention.
Symbol description
10, pump 20, cooling motor 22, oil-feed oil circuit 24, oil return circuit
26, other working oil path 30, cooling fan 40, pilot operated directional control valve 42, temp-control type relief valve
43, switch valve 44, selector valve 45, temp-control type switch valve 46, series flow control valve
48, one-way overflow valve 401, first guide's oil circuit 402, second guide's oil circuit 403, first throttle valve
404, second throttle 42a, 45a, temperature control end T0, fuel tank
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.
The embodiment of the present invention provides a kind of hydraulic cooling system, comprise pump 10, cooling motor 20, the cooling fan 30 of running is driven by cooling motor 20, oil-feed oil circuit 22 between the oil outlet being connected to cooling motor 20 and pump 10 and the oil return circuit 24 be connected between cooling motor 20 and fuel tank T0, described oil-feed oil circuit 22 is provided with the pilot operated directional control valve 40 that a spool aperture is adjustable, described pilot operated directional control valve 40 comprises the hydraulic control end A and hydraulic control end B that are positioned at its opposite end, the oil inlet P logical with pump 10, the actuator port a be communicated with the cooling motor 20 and actuator port b be connected with other oil circuits, described hydraulic cooling system also comprises and to be connected with described hydraulic control end B and to make the temperaturing control pressure device that the pressure of hydraulic control end B changes with hydraulic oil temperature, described pilot operated directional control valve 40 comprises the first working position that described oil inlet P is communicated with actuator port a, and the second working position that described oil inlet P is communicated with actuator port b with actuator port a simultaneously, when the pressure of hydraulic control end B is greater than the pressure of hydraulic control end A, pilot operated directional control valve 40 is positioned at the first working position, when the pressure of hydraulic control end A is greater than the pressure of hydraulic control end B, pilot operated directional control valve 40 is positioned at the second working position, during described hydraulic control end A draining, described pilot operated directional control valve 40 is in the first working position, the hydraulic oil that described pump 10 exports rotates to drive described cooling fan 30 at full speed through cooling motor 20, the described hydraulic cooling system state of cooling in advance, and described hydraulic control end A and hydraulic control end B all not draining time, described temperaturing control pressure device controls the size of the pressure of described hydraulic control end B according to the temperature of hydraulic oil in described hydraulic cooling system, switch between the first working position and the second working position to control pilot operated directional control valve 40, thus regulate the spool aperture size of described pilot operated directional control valve 40, and then change the flow that hydraulic oil that described pump 10 exports exports cooling motor 20 to and rotate by different rotating speeds to drive described cooling fan 30, described hydraulic cooling system is in the state of cooling as required.When the present invention is by hydraulic control end A draining, pilot operated directional control valve 40 is made to be in the first working position, now no matter to the control of hydraulic control end B how described temperaturing control pressure device, the pressure oil that pump 10 all can be made to export almost all enters cooling motor 20 and then drives cooling fan 30 full-speed operation, now, can realize the in advance cooling irrelevant with hydraulic fluid temperature, this characteristic is particularly important to the hydraulic system of low-speed heave-load; In addition, when hydraulic control end A and hydraulic control end B all not draining time, by described temperaturing control pressure device control described hydraulic control end B pressure so that control described pilot operated directional control valve 40 spool aperture and control pilot operated directional control valve 40 switch between the first working position and the second working position, control the flow being entered cooling motor 20 by pilot operated directional control valve 40, realize the control of hydraulic fluid temperature to cooling motor 20 oil inlet quantity, make the rotating speed of cooling fan 30 relevant with hydraulic fluid temperature, realize cooling in real time as required, energy-conservation, good in economic efficiency.
It should be noted that, hydraulic fluid temperature mentioned in the embodiment of the present invention refers to the temperature of hydraulic oil in described hydraulic cooling system.
Further, described hydraulic control end A is communicated with described oil inlet P by first guide's oil circuit 401, described hydraulic control end B is communicated with described oil inlet P by second guide's oil circuit 402, namely described hydraulic control end A is all communicated with described oil inlet P with hydraulic control end B, described pilot operated directional control valve 40 also comprises spring chamber, described spring chamber and described hydraulic control end B are positioned at the same side of described pilot operated directional control valve 40, spring and hydraulic control end B acting in conjunction are in the one end at hydraulic control end B place, therefore, as long as hydraulic control end A draining, no matter hydraulic control end B is with or without oil-feed, pilot operated directional control valve 40 all can be made to be positioned at the first working position, the pilot control to hydraulic control end A and hydraulic control end B can be realized without the need to extra pilot control.
In order to meet the draining requirement to hydraulic control end A, described hydraulic control end A is connected with oil return circuit 24 by a switch valve 43, is namely connected with fuel tank T0.The structure of described switch valve 43 is not limit, as long as it can play connection, end oil circuit between described first guide's oil circuit 401 and oil return circuit 24.Such as, conveniently control the break-make of described switch valve 43, described switch valve 43 is solenoid directional control valve.The oil inlet end of described solenoid directional control valve is connected to first guide's oil circuit 401, and the oil outlet end of described solenoid directional control valve is communicated with oil return circuit 24, is namely communicated with fuel tank T0, and the automatically controlled end of solenoid directional control valve is electrically connected with other electric controllers, such as handle, push-button switch etc.; Described solenoid directional control valve comprises the first working position of the oil circuit between connection first guide oil circuit 401 and fuel tank T0 and blocks the second working position of the oil circuit between first guide's oil circuit 401 and fuel tank T0.When described solenoid directional control valve is positioned at the first working position, the hydraulic control end A draining of described pilot operated directional control valve 40, the first working position is in described in pilot operated directional control valve 40, described hydraulic cooling system is in the state of cooling in advance, described oil inlet P is communicated with actuator port a, and the pressure oil that described pump 10 exports almost enters cooling motor 20 entirely, and cooling motor 20 drives cooling fan 30 full-speed operation, realize the in advance cooling irrelevant with hydraulic fluid temperature, this characteristic is particularly important to the hydraulic system of low-speed heave-load.Described solenoid directional control valve is positioned at the second working position, described hydraulic control end A and hydraulic control end B oil-feed simultaneously, the pressure of hydraulic control end B is controlled by temperaturing control pressure device, switch between the first working position and the second working position to control this pilot operated directional control valve 40, and then control the spool aperture of described pilot operated directional control valve 40, control the flow being entered cooling motor 20 by pilot operated directional control valve 40, realize the control of hydraulic fluid temperature to cooling motor 20 oil inlet quantity, make the rotating speed of cooling fan 30 relevant with hydraulic fluid temperature, realize cooling in real time as required.
In addition, described first guide's oil circuit 401 is provided with first throttle valve 403, one end of described first throttle valve 403 is connected with described oil inlet P, and the other end of described first throttle valve 403 is connected on the oil circuit between hydraulic control end A and switch valve 43, for regulating the pressure of first guide's oil circuit 401; Second guide's oil circuit 402 is provided with second throttle 404, one end of described second throttle 404 is connected with described oil inlet P, the other end of described second throttle 404 is connected on the oil circuit between hydraulic control end B and temperaturing control pressure device, for regulating the pressure of second guide's oil circuit 402.
It should be noted that, first guide's oil circuit 401 and the pressure oil needed for second guide's oil circuit 402 seldom, can not affect the pressure of the pressure oil of oil-feed oil circuit 22 substantially.When the solenoid directional control valve as switch valve 43 is in the first working position, first guide's oil circuit 401 draining, now, partial pressure oil in oil-feed oil circuit 22 is by guide's oil circuit draining, but, because the pressure oil entering guide's oil circuit is little, so, first guide's oil circuit 401 draining now to the pressure of oil-feed oil circuit 22 and flow effect little.
Described temperaturing control pressure device can be single temp-control type pressure valve, also can be that multiple temp-control type pressure valve is integrated, can also be that other have the device of temperature and pressure regulatory function.In the present embodiment, described temperaturing control pressure device is single temp-control type pressure valve, described temperaturing control pressure valve comprises a temperature control end, described temperature control end comprises one and presets temperature control value, when the temperature of hydraulic oil is more than or equal to this default temperature control value, temperaturing control pressure valve controls the rising of the pressure following temperature of second guide's oil circuit 402 and raises, and reduces with the reduction of temperature.Preferably, described temp-control type pressure valve is temp-control type relief valve 42, described temp-control type relief valve 42 is for having the relief valve of temperature control end, described temp-control type relief valve 42 comprises the oil inlet end be communicated with second guide's oil circuit 402, the oil outlet end be communicated with fuel tank T0, temperature control end 42a, described temp-control type relief valve 42 also comprises a spring terminal, described temperature control end 42a is positioned at the other end relative with described spring terminal, described temperature control end 42a and the spool of described spring terminal to temp-control type relief valve 42 apply rightabout active force, the active force of described temperature control end 42a to the spool of temp-control type relief valve 42 is relevant with hydraulic fluid temperature.Described temperature control end 42a comprises one and presets temperature control value, when hydraulic fluid temperature is more than or equal to this default temperature control value, the temperature of the hydraulic oil of described cooling system is higher, the active force of described temperature control end 42a to the spool of temp-control type relief valve 42 is larger, the spool aperture of temp-control type relief valve 42 is less, second guide's oil circuit 402 is fewer to the hydraulic oil of fuel tank T0 by this temp-control type relief valve 42 overflow, the pressure of the hydraulic oil of described second guide's oil circuit 402 is higher, in like manner, hydraulic fluid temperature is lower, the pressure of the hydraulic oil in described second guide's oil circuit 402 is also corresponding lower.When the temperature of hydraulic oil is less than described default temperature control value, temp-control type relief valve 42 is in overflow situation always, namely spool has certain aperture, the part fluid of second guide's oil circuit 402 passes through this temp-control type relief valve 42 overflow to fuel tank T0, now pilot operated directional control valve 40 is in the second working position, the fuel-displaced fluid part of pump 10 enters cooling motor 20, cooling motor 20 drives described cooling fan 30 low-speed running, another part then enters other working oil path 26, can be other working oil path 26 and collaborate fuel feeding, accelerate the machinery action etc. in this working oil path, therefore, cooling system of the present invention has shunting effect, take full advantage of the power of hydraulic system, energy-conservation, when the temperature of hydraulic oil is more than or equal to described default temperature control value, the spool of described temperature control end 42a to described temp-control type relief valve 42 applies a certain size active force, along with the rising gradually of temperature, it is larger that described temperature control end 42a applies active force to the spool of described temp-control type relief valve 42, the spool aperture of described temp-control type relief valve 42 reduces gradually, the pressure of second guide's oil circuit 402 is raised gradually, the spool aperture of pilot operated directional control valve 40 becomes large gradually, the flow entering cooling motor 20 increases gradually, the rotating speed of described cooling fan 30 is increased gradually along with the rising of hydraulic fluid temperature, when hydraulic fluid temperature is increased to certain temperature value, illustrate that the heating of hydraulic system seriously needs in time cooling fast, now, second guide's oil circuit 402 controls described pilot operated directional control valve 40 and switches to the first working position by the second working position, the pressure oil of the oil outlet of described pump 10 nearly all enters cooling motor 20, cooling motor 20 is made to drive cooling fan 30 full-speed operation, accelerate the cooling to hydraulic oil.
Temperaturing control pressure valve of the present invention can also be other forms of valve, such as, refer to Fig. 3, the temperaturing control pressure valve of another embodiment of the present invention is temp-control type switch valve 45, described temp-control type switch valve 45 is for having the selector valve of temperature control end, in the present embodiment, for bi-bit bi-pass selector valve, described temp-control type switch valve 45 comprises a temperature control end 45a and the spring terminal relative with this temperature control end, described temperature control end 45a is contrary to the spool active force of described temp-control type switch valve 45 with spring terminal, to control described temp-control type switch valve 45 switch operating position and regulating spool aperture.This temperature control end 45a comprises one and presets temperature control value, the active force of this temperature control end 45a to the spool of temp-control type switch valve 45 is relevant with hydraulic fluid temperature, when the temperature of hydraulic oil is more than or equal to this default temperature control value, hydraulic fluid temperature is higher, the active force of described temperature control end 45a to the spool of temp-control type switch valve 45 is larger, and the spool aperture of temp-control type switch valve 45 is less.When the temperature of hydraulic oil is less than described default temperature control value, temp-control type switch valve 45 is in the first working position of described second guide's oil circuit 402 and described fuel tank T0 connected state always, now pilot operated directional control valve 40 is in the second working position, the fuel-displaced fluid part of pump 10 enters cooling motor 20, cooling motor 20 drives described cooling fan 30 low-speed running, another part then enters other working oil path 26, can be other working oil path 26 and collaborate fuel feeding, accelerate the machinery action etc. in this working oil path, therefore, cooling system of the present invention has shunting effect, take full advantage of the power of hydraulic system, when the temperature of hydraulic oil is more than or equal to described default temperature control value, described temperature control end 45a applies active force to the spool of described temp-control type switch valve 45, described temp-control type switch valve 45 is in the second adjustable working position of spool aperture, along with the rising gradually of temperature, the spool aperture of described temp-control type switch valve 45 reduces gradually, the flow that described second guide's oil circuit 402 flow to fuel tank T0 by this temp-control type switch valve 45 reduces along with the rising of hydraulic fluid temperature, the pressure of second guide's oil circuit 402 is raised gradually, the spool aperture of pilot operated directional control valve 40 becomes large gradually, the flow entering cooling motor 20 increases gradually, the rotating speed of described cooling fan 30 is increased gradually along with the rising of hydraulic fluid temperature, when hydraulic fluid temperature is increased to certain temperature value, illustrate that the heating of hydraulic system seriously needs in time cooling fast, described second guide's oil circuit 402 controls described pilot operated directional control valve 40 and switches to the first working position by the second working position, the pressure oil of the oil outlet of described pump 10 nearly all enters cooling motor 20, cooling motor 20 is made to drive cooling fan 30 full-speed operation, accelerate the cooling to hydraulic oil.
It should be noted that, described cooling fan low-speed running does not refer to lower than a certain numerical value rotation determined, but for the speed during rotation of cooling fan full speed.
In order to reduce the changes in flow rate of the pressure oil that pump 10 exports to the impact of cooling oil return, in the embodiment of the present invention, oil-feed oil circuit 22 between described pump 10 and pilot operated directional control valve 40 is provided with series flow control valve 46, and further, described series flow control valve 46 is bypass type series flow control valve 46.
Further, described cooling motor 20 is reversing motor, is provided with selector valve 44 between described pilot operated directional control valve 40 and cooling motor 20, and the arbitrary hydraulic fluid port of described oil-feed oil circuit 22 with described cooling motor 20 is optionally communicated with by described selector valve 44; When oil-feed oil circuit 22 is communicated with one of them hydraulic fluid port, cooling motor 20 drives cooling fan 30 to rotate forward, and realizes the cooling to hydraulic oil; When oil-feed oil circuit 22 is with when wherein another hydraulic fluid port is communicated with, cooling motor 20 drives cooling fan 30 to reverse, and realizes the automatic cleaning function of fan.Particularly, described cooling motor 20 comprises hydraulic fluid port C and hydraulic fluid port D, described selector valve 44 is solenoid directional control valve, described solenoid directional control valve comprises automatically controlled end, filler opening, the actuator port d of return opening, the actuator port c be connected with the hydraulic fluid port C of described cooling motor 20 and the hydraulic fluid port D with described cooling motor 20 that is communicated with fuel tank T0, and described solenoid directional control valve comprises the first working position that filler opening is communicated with actuator port c and the second working position that filler opening is communicated with actuator port d.When solenoid directional control valve as selector valve 44 is positioned at the first working position, described cooling motor 20 drives cooling fan 30 to rotate forward, realize the cooling to hydraulic oil, when solenoid directional control valve as selector valve 44 is positioned at the second working position, described cooling motor 20 drives cooling fan 30 to reverse, and realizes the automatic cleaning function of fan.
Oil-feed oil circuit 22 between described pilot operated directional control valve 40 and cooling motor 20 is provided with one-way overflow valve 48, the filler opening of described one-way overflow valve 48 is connected with described oil-feed oil circuit 22, and the oil outlet of described one-way overflow valve 48 is communicated with described oil return circuit 24 or fuel tank T0.Described one-way overflow valve 48 has repairing and pressure limiting effect, when cooling motor 20 shuts down, by the low-pressure cavity of one-way overflow valve 48 by the pressure oil supply cooling motor 20 in fuel tank T0, with phenomenons such as cavitation-preventives; During the pressure oil overpressure of the oil-feed oil circuit 22 between described pilot operated directional control valve 40 and cooling motor 20 time (as stuck in fan, cooling motor 20 or pipeline blockage), one-way overflow valve 48 is opened in time and is limited pressure on this oil-feed oil circuit 22 to protect cooling motor 20.
Below in conjunction with accompanying drawing, the working principle of hydraulic cooling system of the present invention and working procedure are described in detail.
For the hydraulic system be often operated under low-speed heave-load operating mode, system heating value is large, needs to cool in advance it.In the present invention, when needs cool in advance to hydraulic system, manually can control described switch valve 43 and be in connected state, namely the first working position is in, now, hydraulic system carries out the in advance cooling irrelevant with the temperature of hydraulic oil, cooling motor 20 drives cooling fan 30 full-speed operation, preferably, when described switch valve 43 is solenoid directional control valve, can the power on circuitry that is connected with the automatically controlled end of this solenoid directional control valve of Non-follow control, make hydraulic system carry out the in advance cooling irrelevant with the temperature of hydraulic oil, control convenient and swift.If now need to carry out automated cleaning to fan, control described selector valve 44 and switch to the second working position by the first working position, cooling motor 20 reverses, and drive fan is reversed, and realizes the automatic cleaning function of fan.
When hydraulic fluid temperature reaches the default temperature control value of described temperaturing control pressure device and needs the cooling as required realizing hydraulic cooling system, first control switch valve 43 cuts out, hydraulic control end A and hydraulic control end B all not drainings, by described temperaturing control pressure device control described hydraulic control end B pressure so that control described pilot operated directional control valve 40 spool aperture and control pilot operated directional control valve 40 switch between the first working position and the second working position, control the flow being entered cooling motor 20 by pilot operated directional control valve 40, realize the control of hydraulic fluid temperature to cooling motor 20 oil inlet quantity, make the rotating speed of cooling fan 30 relevant with hydraulic fluid temperature, realize cooling in real time as required.
The present invention also provides a kind of engineering machinery, comprise Working mechanism and drive the hydraulic work system of this Working mechanism, described hydraulic work system comprises the first oil sources to drive described Working mechanism work, this project machinery also comprises above-mentioned hydraulic cooling system, and other working oil path 26 described are any operative oil circuit for described Working mechanism fuel feeding in described hydraulic work system; When described pilot operated directional control valve 40 is in the second working position, described pump 10 collaborates to collaborate fuel feeding for described Working mechanism with described first oil sources by described pilot operated directional control valve 40.
Below a preferred embodiment of the present invention is described in detail by reference to the accompanying drawings, but, be 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.
Claims (10)
1. hydraulic cooling system, comprise pump (10), cooling motor (20), the cooling fan (30) driving running by described cooling motor (20), be connected to described cooling motor (20) and described pump (10) oil outlet between oil-feed oil circuit (22) and the oil return circuit (24) that is connected between described cooling motor (20) and fuel tank (T0), it is characterized in that
Described hydraulic cooling system comprises the pilot operated directional control valve (40) being arranged at the spool aperture on described oil-feed oil circuit (22) and can regulating, described pilot operated directional control valve (40) comprises the hydraulic control end A and hydraulic control end B that are positioned at its opposite end, the oil inlet P be communicated with the oil outlet of described pump (10), the actuator port a be communicated with cooling motor (20), and the actuator port b to be connected with other working oil path (26) in the hydraulic system with this hydraulic cooling system, described pilot operated directional control valve (40) comprises the first working position that described oil inlet P is communicated with described actuator port a and the second working position that described oil inlet P is communicated with actuator port b with described actuator port a simultaneously,
Described hydraulic cooling system also comprises the temperaturing control pressure device be connected with described hydraulic control end B;
During described hydraulic control end A draining, described pilot operated directional control valve (40) is in the first working position, the hydraulic oil that described pump (10) exports rotates to drive described cooling fan (30) at full speed through cooling motor (20), and described hydraulic cooling system is in the state of cooling in advance;
And described hydraulic control end A and hydraulic control end B all not draining time, described temperaturing control pressure device controls the size of the pressure of described hydraulic control end B according to the temperature of hydraulic oil in described hydraulic cooling system, switch between the first working position and the second working position to control described pilot operated directional control valve (40), thus regulate the spool aperture size of described pilot operated directional control valve (40), and then change the flow that hydraulic oil that described pump (10) exports exports cooling motor (20) to and rotate by different rotating speeds to drive described cooling fan (30), described hydraulic cooling system is in the state of cooling as required.
2. hydraulic cooling system as claimed in claim 1, it is characterized in that, described hydraulic control end A is communicated with described oil inlet P by first guide's oil circuit (401), and described first guide's oil circuit (401) is also connected with described fuel tank (T0) by a switch valve (43); Described hydraulic control end B is communicated with described oil inlet P by second guide's oil circuit (402), and described temperaturing control pressure device is connected with described second guide's oil circuit (402).
3. hydraulic cooling system as claimed in claim 2, it is characterized in that, described switch valve (43) is solenoid directional control valve, described solenoid directional control valve comprises the first working position being communicated with described first guide's oil circuit (401) and described fuel tank (T0) and the second working position blocking the oil circuit between described first guide's oil circuit (401) and described fuel tank (T0), when described solenoid directional control valve is positioned at the first working position, described hydraulic cooling system is in the state of cooling in advance; When described solenoid directional control valve is positioned at the second working position, described hydraulic cooling system is in the state of cooling as required.
4. hydraulic cooling system as claimed in claim 2, it is characterized in that, described first guide's oil circuit (401) is provided with first throttle valve (403), one end of described first throttle valve (403) is connected with described oil inlet P, and the other end of described first throttle valve (403) is connected on the oil circuit between hydraulic control end A and switch valve (43); Second guide's oil circuit (402) is provided with second throttle (404), one end of described second throttle (404) is connected with described oil inlet P, and the other end of described second throttle (404) is connected on the oil circuit between hydraulic control end B and temperaturing control pressure device.
5. hydraulic cooling system as claimed in claim 2, it is characterized in that, described temperaturing control pressure device is temp-control type relief valve (42), the oil inlet end of described temp-control type relief valve (42) is connected to described second guide's oil circuit (402), and the oil outlet end of described temp-control type relief valve (42) is connected to fuel tank (T0), described temp-control type relief valve (42) comprises one and presets temperature control value, when the temperature of hydraulic oil is less than described default temperature control value, temp-control type relief valve (42) is in overflow situation always, described pilot operated directional control valve (40) is in the second working position, described cooling fan (30) low-speed running, when the temperature of hydraulic oil is more than or equal to described default temperature control value, the spool aperture of described temp-control type relief valve (42) is adjustable, reduced along with the rising of hydraulic fluid temperature by the flow of this temp-control type relief valve (42) overflow to fuel tank (T0) to control described second guide's oil circuit (402), the rotating speed of described cooling fan (30) increases gradually along with the rising of hydraulic fluid temperature.
6. hydraulic cooling system as claimed in claim 2, it is characterized in that, described temperaturing control pressure device is temp-control type switch valve (45), the oil inlet end of described temp-control type switch valve (45) is connected to described second guide's oil circuit (402), and the oil outlet end of described temp-control type switch valve (45) is connected to fuel tank (T0); Described temp-control type switch valve (45) comprises one and presets temperature control value, when the temperature of hydraulic oil is less than described default temperature control value, temp-control type switch valve (45) is in the first working position of described second guide's oil circuit (402) and described fuel tank (T0) connected state always, described pilot operated directional control valve (40) is in the second working position, described cooling fan (30) low-speed running; When the temperature of hydraulic oil is more than or equal to described default temperature control value, described temp-control type switch valve (45) is in the second adjustable working position of spool aperture, the flow flowing to fuel tank (T0) by this temp-control type switch valve (45) to control described second guide's oil circuit (402) reduces along with the rising of hydraulic fluid temperature, and the rotating speed of described cooling fan (30) increases gradually along with the rising of hydraulic fluid temperature.
7. hydraulic cooling system as claimed in claim 1, it is characterized in that, described cooling motor (20) is reversing motor, selector valve (44) is provided with between described pilot operated directional control valve (40) and cooling motor (20), described oil-feed oil circuit (22) is optionally communicated with a wherein hydraulic fluid port of described cooling motor (20), to control turning to of described cooling fan (30) by described selector valve (44).
8. hydraulic cooling system as claimed in claim 7, it is characterized in that, described selector valve (44) is solenoid directional control valve, described solenoid directional control valve comprises filler opening, return opening, the actuator port c be connected with wherein one end of described cooling motor (20) and the actuator port d be connected with the wherein the other end of described cooling motor (20), described solenoid directional control valve comprises filler opening and to be communicated with actuator port c and the first working position of being communicated with fuel tank (T0) of return opening and filler opening are communicated with actuator port d and the second working position of being communicated with fuel tank (T0) of return opening.
9. hydraulic cooling system as claimed in claim 1, it is characterized in that, oil-feed oil circuit (22) between described pilot operated directional control valve (40) and cooling motor (20) is provided with one-way overflow valve (48), the filler opening of described one-way overflow valve (48) is connected with described oil-feed oil circuit (22), and the oil outlet of described one-way overflow valve (48) is communicated with described oil return circuit (24) or fuel tank (T0).
10. engineering machinery, comprise Working mechanism and drive the hydraulic work system of this Working mechanism, described hydraulic work system comprises the first oil sources to drive described Working mechanism work, it is characterized in that, this project machinery also comprises the hydraulic cooling system according to any one of claim 1-9, any operative oil circuit of described other working oil path (26) in described hydraulic work system being described Working mechanism fuel feeding; When described pilot operated directional control valve (40) is in the second working position, described pump (10) collaborates to collaborate fuel feeding for described Working mechanism by described pilot operated directional control valve (40) and described first oil sources.
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| CN104074844B (en) * | 2014-07-02 | 2016-03-30 | 北京机械设备研究所 | A kind of debugging mobile hydraulic oil source |
| CN104763695B (en) * | 2015-04-13 | 2017-08-29 | 徐州徐工施维英机械有限公司 | Hydraulic system, cooling system and engineering machinery |
| CN107605867A (en) * | 2017-08-25 | 2018-01-19 | 浙江志高机械股份有限公司 | The intelligent temperature control system of rig |
| CN107654426A (en) * | 2017-10-30 | 2018-02-02 | 湖南五新隧道智能装备股份有限公司 | A kind of drill jumbo and its impulsive control hydraulic system |
| CN110778545A (en) * | 2019-11-01 | 2020-02-11 | 上海三一重机股份有限公司 | Fan control system and engineering machinery vehicle |
| CN111188810A (en) * | 2020-01-14 | 2020-05-22 | 三一汽车起重机械有限公司 | Hydraulic oil circuit and engineering machinery |
| CN113389763B (en) * | 2021-06-30 | 2024-04-05 | 湖南双达机电有限责任公司 | Hydraulic system, engineering vehicle and high-speed traction method |
| CN113983009B (en) * | 2021-10-28 | 2023-10-27 | 三一重机有限公司 | Fan rotation speed control system, fan rotation speed control method and engineering machinery |
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