CN103511403A - Hydraulic cooling system and engineering machine including same - Google Patents
Hydraulic cooling system and engineering machine including same Download PDFInfo
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- CN103511403A CN103511403A CN201310479650.4A CN201310479650A CN103511403A CN 103511403 A CN103511403 A CN 103511403A CN 201310479650 A CN201310479650 A CN 201310479650A CN 103511403 A CN103511403 A CN 103511403A
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Abstract
The invention discloses a hydraulic cooling system. The hydraulic cooling system comprises a pump (10), a cooling motor (20), a cooling fan (30), an oil inlet oil way (22) and an oil return oil way (24). The cooling fan (30) is driven by the cooling motor (20) to run, the oil inlet oil way (22) is connected between the cooling motor (20) and the oil outlet of the pump (10), and the oil return oil way (24) is connected between the cooling motor (20) and an oil tank (T0). The hydraulic cooling system is characterized in that a hydraulic control reversing valve (40) with the adjustable aperture of a valve core is arranged on the oil inlet oil way (22); the hydraulic control reversing valve (40) comprises a hydraulic control end A and a hydraulic control end B, an oil inlet P, a working oil port a and a working oil port b. The hydraulic control end A and the hydraulic control end B are located at the two opposite ends of the hydraulic control reversing valve, the oil inlet P is communicated with the oil inlet of the pump (10), the working oil port a is communicated with the cooling motor (20), and the working oil port b is connected with other working oil ways (26). The hydraulic cooling system further comprises a temperature control pressure device, wherein the temperature control pressure device is connected with the hydraulic control end B and enables the pressure of the hydraulic control end B to change along with the temperature of hydraulic oil. The hydraulic cooling system has both the precooling function and the cooling as required function and is good in energy saving and economic returns. Through the hydraulic cooling system, the power of the hydraulic system can be effectively utilized to cool the hydraulic oil.
Description
Technical field
The present invention relates to hydraulics field, relate in particular to hydraulic cooling system and there is its engineering machinery.
Background technique
Hydraulic Power Transmission System is generally for engineering machinery field, and hydraulic system, producing amount of heat under working state for a long time, raises hydraulic oil temperature.Cooling as required for realizing hydraulic oil temperature, hydraulic system is provided with hydraulic pressure cooling circuit conventionally, for the frequent cooling capacity of the hydraulic pressure cooling circuit of work regulates automatically with hydraulic oil temperature, keep hydraulic oil temperature all the time in suitable temperature range, just need to automatically regulate according to hydraulic oil temperature the rotating speed of the fan in cooling circuit, realize in good time cooling as required, to save energy and reduce the cost.
Refer to Fig. 1, Fig. 1 is existing hydraulic pressure cooling circuit, electromagnetic relief valve 20 ', one-way valve 22 ', the fixed displacement motor 30 ' in parallel with described electromagnetic relief valve 20 ' and the cooling fan 40 ' being driven by this fixed displacement motor 30 ' between the oil outlet that comprise metering pump 10 ', is connected to metering pump 10 ' and fuel tank.On this hydraulic pressure cooling circuit, be provided with temperature transducer, by this temperature transducer, controlled the switching electricity of the control end of electromagnetic relief valve 20 ', and then control fixed displacement motor 30 ' drive cooling fan 40 ' and rotate or do not rotate, but can not control the temperature variant flow of fixed displacement motor 30 ', can not be in good time cooling as required according to hydraulic oil temperature, and to being often operated in the hydraulic system under low-speed heave-load operating mode, system heating value is large, does not have to adopt cooling in advance method hydraulic system to be carried out cooling in advance.
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, by described cooling motor, driven the cooling fan of running, be connected to the oil-feed oil circuit between described cooling motor and the oil outlet of described pump and be connected to the oil return circuit between described cooling motor and fuel tank, described hydraulic cooling system comprises the pilot operated directional control valve being arranged on described oil-feed oil circuit, described pilot operated directional control valve comprises hydraulic control end A and the hydraulic control end B that is positioned at its opposite end, the oil inlet P being communicated with the oil outlet of described pump, the actuator port a being communicated with cooling motor, and the actuator port b being connected with other working oil path in thering is the hydraulic system of this hydraulic cooling system, described pilot operated directional control valve comprises the second working position that the first working position that described oil inlet P is communicated with described actuator port a and described oil inlet P are communicated with described actuator port a and actuator port b simultaneously, described hydraulic cooling system also comprises the temperaturing control pressure device being 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, the hydraulic oil of described pump output through cooling motor to drive described cooling fan to rotate at full speed, in the state of cooling in advance, and described hydraulic control end A and hydraulic control end B be not all during draining, described temperaturing control pressure device is controlled the size of the pressure of described hydraulic control end B according to the temperature of hydraulic oil in described hydraulic cooling system, to control described pilot operated directional control valve, between the first working position and the second working position, switch, thereby regulate the spool aperture size of described pilot operated directional control valve (40), and then the flow that the hydraulic oil that changes the output of described pump exports cooling motor to be to drive described cooling fan to rotate by different rotating speeds, 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 described first guide's oil circuit of connection and the first working position of fuel tank and the second working position of 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, on described first guide's oil circuit, be provided with first throttle valve, described first throttle Fa one end 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; On second guide's oil circuit, be provided with the second throttle valve, one end of described the second throttle valve is connected with described oil inlet P, and the other end of described the second throttle valve is connected on the oil circuit between hydraulic control end B and temperaturing control pressure device.
Preferably, described pressure control 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 a default temperature control value, and when the temperature of hydraulic oil is less than described default temperature control value, temp-control type relief valve is always in overflow situation, 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, to control described second guide's oil circuit, by this temp-control type relief valve overflow, to the rising along with hydraulic fluid temperature of the flow of fuel tank, reduce, the rotating speed of described cooling fan increases gradually along with the rising of hydraulic fluid temperature.
Preferably, described pressure control 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 temperaturing control pressure valve is connected to fuel tank; Described temp-control type switch valve comprises a default temperature control value, when the temperature of hydraulic oil is less than described default temperature control value, temp-control type switch valve is the first working position in 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, to control described second guide's oil circuit flow to fuel tank flow by this temp-control type switch valve along with the rising of hydraulic fluid temperature reduces, the rotating speed of described cooling fan increases gradually along with the rising of hydraulic fluid temperature.
Preferably, described cooling motor is reversing motor, between described pilot operated directional control valve and cooling motor, be provided with selector valve, described selector valve is optionally communicated with described oil-feed oil circuit with a wherein hydraulic fluid port of described cooling motor, to control turning to of described cooling fan.
Preferably, described selector valve is solenoid directional control valve, described solenoid directional control valve comprises filler opening, return opening, the actuator port c being connected with wherein one end of described cooling motor and the actuator port d being connected with the wherein the other end of described cooling motor, and described solenoid directional control valve comprises the first working position that filler opening is communicated with actuator port c and return opening is communicated with fuel tank and the second working position that filler opening is communicated with actuator port d and return opening is communicated with fuel tank.
Preferably, on the oil-feed oil circuit between described pilot operated directional control valve and cooling motor, be 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 that the first oil sources is to drive described Working mechanism work, this project machinery also comprises above-mentioned hydraulic cooling system, and described other working oil path are in described hydraulic work system, to be arbitrary working oil path of described Working mechanism fuel feeding; Described pilot operated directional control valve is when the second working position, and described pump is described Working mechanism interflow fuel feeding by described pilot operated directional control valve and described the first oil sources interflow.
The present invention is during by hydraulic control end A draining, make pilot operated directional control valve in the first working position, now no matter described temperaturing control pressure device to the control of hydraulic control end B how, all can make the pressure oil of pump output almost all enter cooling motor and then drive cooling fan full-speed operation, now, can realize and irrelevant cooling in advance of hydraulic fluid temperature; In addition, when hydraulic control end A and hydraulic control end B be not all during draining, by described temperaturing control pressure device, control the pressure of described hydraulic control end B and then control the spool aperture of described pilot operated directional control valve and control pilot operated directional control valve and switch between the first working position and the second working position, control is entered the flow of 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, energy-conservation, good in economic efficiency as required.
Accompanying drawing explanation
Fig. 1 is the hydraulic pressure cooling circuit schematic 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, the second throttle valve 42a, 45a, temperature control end T0, fuel tank
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is elaborated.Should be understood that, embodiment described herein only, for description and interpretation 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, by cooling motor 20, driven the cooling fan 30 of running, be connected to the oil-feed oil circuit 22 between cooling motor 20 and the oil outlet of pump 10 and be connected to cooling motor 20 and fuel tank T0 between oil return circuit 24, on described oil-feed oil circuit 22, be provided with the adjustable pilot operated directional control valve 40 of a spool aperture, described pilot operated directional control valve 40 comprises hydraulic control end A and the hydraulic control end B that is positioned at its opposite end, the oil inlet P logical with pump 10, the actuator port a being communicated with cooling motor 20 and the actuator port b being connected with other oil circuits, described hydraulic cooling system also comprises and is connected with described hydraulic control end B and makes the pressure of hydraulic control end B with the temperaturing control pressure device of hydraulic oil temperature variation, 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 of being communicated with actuator port a and actuator port b of described oil inlet P 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 of described pump 10 outputs through cooling motor 20 to drive described cooling fan 30 to rotate at full speed, described hydraulic cooling system is the state of cooling in advance, and described hydraulic control end A and hydraulic control end B be not all during draining, described temperaturing control pressure device is controlled the size of the pressure of described hydraulic control end B according to the temperature of hydraulic oil in described hydraulic cooling system, to control pilot operated directional control valve 40, between the first working position and the second working position, switch, thereby regulate the spool aperture size of described pilot operated directional control valve 40, and then the flow that the hydraulic oil that changes described pump 10 outputs exports cooling motor 20 to is to drive described cooling fan 30 to rotate by different rotating speeds, described hydraulic cooling system is in the state of cooling as required.The present invention is during by hydraulic control end A draining, make pilot operated directional control valve 40 in the first working position, now no matter described temperaturing control pressure device to the control of hydraulic control end B how, all can make the pressure oil of pump 10 outputs almost all enter cooling motor 20 and then drive cooling fan 30 full-speed operations, now, can realize and irrelevant cooling in advance of 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 be not all during draining, by described temperaturing control pressure device, control the pressure of described hydraulic control end B and then control the spool aperture of described pilot operated directional control valve 40 and control pilot operated directional control valve 40 and switch between the first working position and the second working position, control is entered the flow of cooling motor 20 by pilot operated directional control valve 40, realize the control of hydraulic fluid temperature to cooling motor 20 oil inlet quantities, make the rotating speed of cooling fan 30 relevant with hydraulic fluid temperature, realize cooling in real time, energy-conservation, good in economic efficiency as required.
It should be noted that, in the embodiment of the present invention, mentioned hydraulic fluid temperature 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, be that described hydraulic control end A and hydraulic control end B are all communicated with described oil inlet P, described pilot operated directional control valve 40 also comprises spring chamber, described spring chamber and described hydraulic control end B are positioned at described pilot operated directional control valve 40 the same side, 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 has or not oil-feed, all can make pilot operated directional control valve 40 be positioned at the first working position, without extra pilot control, can realize the pilot control to hydraulic control end A and hydraulic control end B.
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 connected with fuel tank T0.The structure of described switch valve 43 is not limit, as long as it can play connection, end the oil circuit between described first guide's oil circuit 401 and oil return circuit 24.For example, for convenient, the break-make of described switch valve 43 is controlled, 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 communicated with fuel tank T0, and the automatically controlled end of solenoid directional control valve is electrically connected to 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's oil circuit 401 and fuel tank T0 and the second working position of blocking 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, described in pilot operated directional control valve 40 in the first working position, 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 of described pump 10 outputs almost enters cooling motor 20 entirely, and cooling motor 20 drives cooling fan 30 full-speed operations, it is cooling in advance that realization and hydraulic fluid temperature have nothing to do, and 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, by temperaturing control pressure device, control the pressure of hydraulic control end B, to control this pilot operated directional control valve 40, between the first working position and the second working position, switch, and then control the spool aperture of described pilot operated directional control valve 40, control is entered the flow of cooling motor 20 by pilot operated directional control valve 40, realize the control of hydraulic fluid temperature to cooling motor 20 oil inlet quantities, 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, described first throttle Fa403 one end 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; On second guide's oil circuit 402, be provided with the second throttle valve 404, described second throttle valve 404 one end is connected with described oil inlet P, the other end of described the second throttle valve 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, the required pressure oil of first guide's oil circuit 401 and 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 during in the first working position, first guide's oil circuit 401 drainings, now, partial pressure oil in oil-feed oil circuit 22 is by guide's oil circuit draining, but, due to the pressure oil that enters guide's oil circuit seldom, so first guide's oil circuit 401 drainings are now little to the pressure of oil-feed oil circuit 22 and flow effect.
Described pressure control device can be single temp-control type pressure valve, can be also that a plurality of temp-control type pressure valve are integrated, can also be other devices with temperature and pressure regulatory function.In the present embodiment, described pressure control device is single temp-control type pressure valve, described temperaturing control pressure valve comprises a temperature control end, described temperature control end comprises a default temperature control value, when the temperature of hydraulic oil is more than or equal to this default temperature control value, temperaturing control pressure valve control second guide's oil circuit 402 pressure following temperature rising and raise, with the reduction of temperature, reduce.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 being communicated with second guide's oil circuit 402, the oil outlet end being 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 described spring terminal apply rightabout active force to the spool of temp-control type relief valve 42, described temperature control end 42a is relevant with hydraulic fluid temperature to the active force of the spool of temp-control type relief valve 42.Described temperature control end 42a comprises a default 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, described temperature control end 42a is larger to the active force of the spool of temp-control type relief valve 42, 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 these temp-control type relief valve 42 overflows, the pressure of the hydraulic oil of described second guide's oil circuit 402 is just 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 always in overflow situation, be that spool has certain aperture, the part fluid of second guide's oil circuit 402 passes through these temp-control type relief valve 42 overflows 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 runnings, another part enters other working oil path 26, can be other working oil path 26 interflow fuel feeding, accelerate machinery action in this working oil path etc., 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, described temperature control end 42a applies a certain size active force to the spool of described temp-control type relief valve 42, rising gradually along with 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 raise gradually, the spool aperture of pilot operated directional control valve 40 becomes large gradually, the flow that enters 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, the heating that hydraulic system is described seriously needs cooling fast in time, now, second guide's oil circuit 402 is controlled described pilot operated directional control valve 40 and is switched 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, make cooling motor 20 drive cooling fan 30 full-speed operations, quickening is cooling to hydraulic oil.
Temperaturing control pressure valve of the present invention can also be other forms of valve, for example, 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 and spring terminal are contrary to the spool active force of described temp-control type switch valve 45, to control described temp-control type switch valve 45 switch operating positions and regulating spool aperture.This temperature control end 45a comprises a default temperature control value, 45a is relevant with hydraulic fluid temperature to the active force of the spool of temp-control type switch valve 45 for this temperature control end, when the temperature of hydraulic oil is more than or equal to this default temperature control value, hydraulic fluid temperature is higher, described temperature control end 45a is larger to the active force of the spool of temp-control type switch valve 45, 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 the first working position with described fuel tank T0 connected state in described second guide's oil circuit 402 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 runnings, another part enters other working oil path 26, can be other working oil path 26 interflow fuel feeding, accelerate machinery action in this working oil path etc., 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, rising gradually along with temperature, the spool aperture of described temp-control type switch valve 45 reduces gradually, described second guide's oil circuit 402 flow to fuel tank T0 flow by this temp-control type switch valve 45 is along with the rising of hydraulic fluid temperature reduces, the pressure of second guide's oil circuit 402 is raise gradually, the spool aperture of pilot operated directional control valve 40 becomes large gradually, the flow that enters 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, the heating that hydraulic system is described seriously needs cooling fast in time, described second guide's oil circuit 402 is controlled described pilot operated directional control valve 40 and is switched 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, make cooling motor 20 drive cooling fan 30 full-speed operations, quickening is cooling to hydraulic oil.
It should be noted that, described cooling fan low-speed running do not refer to lower than a certain definite numerical value and rotates, but for speed while rotating at full speed with respect to cooling fan.
For the impact on cooling oil return of the changes in flow rate of pressure oil that reduces pump 10 output, in the embodiment of the present invention, on oil-feed oil circuit 22 between described pump 10 and pilot operated directional control valve 40, be provided with series flow control valve 46, further, described series flow control valve 46 is bypass type series flow control valve 46.
Further, described cooling motor 20 is reversing motor, between described pilot operated directional control valve 40 and cooling motor 20, is provided with selector valve 44, and described selector valve 44 is optionally communicated with described oil-feed oil circuit 22 with arbitrary hydraulic fluid port of described cooling motor 20; When oil-feed oil circuit 22 is communicated with one of them hydraulic fluid port, cooling motor 20 drives cooling fan 30 forwards, and realization is cooling to hydraulic oil; When oil-feed oil circuit 22 is when wherein another hydraulic fluid port is communicated with, cooling motor 20 drives cooling fans 30 reversions, 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 comprise automatically controlled end, filler opening, the return opening being communicated with fuel tank T0, the actuator port c being connected with the hydraulic fluid port C of described cooling motor 20 and with the actuator port d of the hydraulic fluid port D of described cooling motor 20, described solenoid directional control valve comprises the second working position that the first working position that filler opening is communicated with actuator port c and filler opening are communicated with actuator port d.While being positioned at the first working position as the solenoid directional control valve of selector valve 44, described cooling motor 20 drives cooling fan 30 forwards, realization is cooling to hydraulic oil, while being positioned at the second working position as the solenoid directional control valve of selector valve 44, described cooling motor 20 drives cooling fan 30 reversions, realizes the automatic cleaning function of fan.
On oil-feed oil circuit 22 between described pilot operated directional control valve 40 and cooling motor 20, be 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, and can be by one-way overflow valve 48 by the low-pressure cavity of the pressure oil supply cooling motor 20 in fuel tank T0, with phenomenons such as cavitation-preventives; When the pressure oil overpressure of the oil-feed oil circuit 22 between described pilot operated directional control valve 40 and cooling motor 20 when (as fan, cooling motor 20 is stuck or pipeline blockage), one-way overflow valve 48 is opened the pressure that limits on this oil-feed oil circuit 22 in time with protection 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 being often operated under low-speed heave-load operating mode, system heating value is large, need to carry out it cooling in advance.In the present invention, when needs carry out when cooling in advance hydraulic system, can be by manually controlling described switch valve 43 in connected state, in the first working position, now, hydraulic system is carried out and irrelevant cooling in advance of the temperature of hydraulic oil, cooling motor 20 drives cooling fan 30 full-speed operations, preferably, when described switch valve 43 is solenoid directional control valve, can manually control the power on circuitry being connected with the automatically controlled end of this solenoid directional control valve, hydraulic system is carried out and irrelevant cooling in advance of the temperature of hydraulic oil, control convenient and swift.If now need fan to carry out automated cleaning, control described selector valve 44 and switch to the second working position by the first working position, cooling motor 20 reversions, 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 need to realize hydraulic cooling system cooling as required, first control switch valve 43 cuts out, hydraulic control end A and hydraulic control end B be draining not all, by described temperaturing control pressure device, control the pressure of described hydraulic control end B and then control the spool aperture of described pilot operated directional control valve 40 and control pilot operated directional control valve 40 and switch between the first working position and the second working position, control is entered the flow of cooling motor 20 by pilot operated directional control valve 40, realize the control of hydraulic fluid temperature to cooling motor 20 oil inlet quantities, 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 that the first oil sources is to drive described Working mechanism work, this project machinery also comprises above-mentioned hydraulic cooling system, and described other working oil path 26 are in described hydraulic work system, to be arbitrary working oil path of described Working mechanism fuel feeding; Described pilot operated directional control valve 40 is when the second working position, and described pump 10 is described Working mechanism interflow fuel feeding by described pilot operated directional control valve 40 and described the first oil sources interflow.
Below describe by reference to the accompanying drawings a preferred embodiment of the present invention in detail, still, 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), by described cooling motor (20) drive running cooling fan (30), be connected to the oil-feed oil circuit (22) between described cooling motor (20) and the oil outlet of described pump (10) and be connected to described cooling motor (20) and fuel tank (T0) between oil return circuit (24), it is characterized in that
Described hydraulic cooling system comprises the pilot operated directional control valve (40) being arranged on described oil-feed oil circuit (22), described pilot operated directional control valve (40) comprises hydraulic control end A and the hydraulic control end B that is positioned at its opposite end, the oil inlet P being communicated with the oil outlet of described pump (10), the actuator port a being communicated with cooling motor (20), and the actuator port b being connected with other working oil path (26) in thering is the hydraulic system of this hydraulic cooling system, described pilot operated directional control valve (40) comprises the second working position that the first working position that described oil inlet P is communicated with described actuator port a and described oil inlet P are communicated with described actuator port a and actuator port b simultaneously,
Described hydraulic cooling system also comprises the temperaturing control pressure device being 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 of described pump (10) output is through cooling motor (20) to drive described cooling fan (30) to rotate at full speed, and described hydraulic cooling system is in the state of cooling in advance;
And described hydraulic control end A and hydraulic control end B be not all during draining, described temperaturing control pressure device is controlled the size of the pressure of described hydraulic control end B according to the temperature of hydraulic oil in described hydraulic cooling system, to control described pilot operated directional control valve (40), between the first working position and the second working position, switch, thereby regulate the spool aperture size of described pilot operated directional control valve (40), and then the flow that the hydraulic oil that changes described pump (10) output exports cooling motor (20) to be to drive described cooling fan (30) press different rotating speeds rotation, 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 described first guide's oil circuit (401) of connection and the first working position of described fuel tank (T0) and the second working position of 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, on described first guide's oil circuit (401), be 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); On second guide's oil circuit (402), be provided with the second throttle valve (404), one end of described the second throttle valve (404) is connected with described oil inlet P, and the other end of described the second throttle valve (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 pressure control 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 a default temperature control value, when the temperature of hydraulic oil is less than described default temperature control value, temp-control type relief valve (42) is always in overflow situation, 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, to control described second guide's oil circuit (402), by this temp-control type relief valve (42) overflow to the flow of fuel tank (T0) rising along with hydraulic fluid temperature, reduce, 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 pressure control 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 temperaturing control pressure valve is connected to fuel tank (T0); Described temp-control type switch valve (45) comprises a default temperature control value, when the temperature of hydraulic oil is less than described default temperature control value, temp-control type switch valve (45) is the first working position with described fuel tank (T0) connected state in described second guide's oil circuit (402) 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, to control described second guide's oil circuit (402) flow to fuel tank (T0) flow by this temp-control type switch valve (45) along with the rising of hydraulic fluid temperature reduces, 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, between described pilot operated directional control valve (40) and cooling motor (20), be provided with selector valve (44), described selector valve (44) is optionally communicated with described oil-feed oil circuit (22) with a wherein hydraulic fluid port of described cooling motor (20), to control turning to of described cooling fan (30).
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 being connected with wherein one end of described cooling motor (20) and the actuator port d being connected with the wherein the other end of described cooling motor (20), and described solenoid directional control valve comprises the first working position that filler opening is communicated with actuator port c and return opening is communicated with fuel tank (T0) and the second working position that filler opening is communicated with actuator port d and return opening is communicated with fuel tank (T0).
9. hydraulic cooling system as claimed in claim 1, it is characterized in that, on oil-feed oil circuit (22) between described pilot operated directional control valve (40) and cooling motor (20), be 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 that the first oil sources is to drive described Working mechanism work, it is characterized in that, this project machinery also comprises the hydraulic cooling system described in any one in claim 1-9, and described other working oil path (26) are in described hydraulic work system, to be arbitrary working oil path of described Working mechanism fuel feeding; Described pilot operated directional control valve (40) is when the second working position, and described pump (10) is described Working mechanism interflow fuel feeding by described pilot operated directional control valve (40) and described the first oil sources interflow.
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| CN201310479650.4A CN103511403B (en) | 2013-10-14 | 2013-10-14 | Hydraulic cooling system and there is its engineering machinery |
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| CN201310479650.4A CN103511403B (en) | 2013-10-14 | 2013-10-14 | Hydraulic cooling system and there is its engineering machinery |
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| CN104074844A (en) * | 2014-07-02 | 2014-10-01 | 北京机械设备研究所 | Debuggable movable hydraulic oil source |
| CN104763695A (en) * | 2015-04-13 | 2015-07-08 | 徐州徐工施维英机械有限公司 | Hydraulic system, radiator 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 |
| CN113389763A (en) * | 2021-06-30 | 2021-09-14 | 湖南双达机电有限责任公司 | Hydraulic system, engineering vehicle and high-speed traction method |
| CN113983009A (en) * | 2021-10-28 | 2022-01-28 | 三一重机有限公司 | Fan rotating speed control system, fan rotating speed control method and engineering machinery |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113389763A (en) * | 2021-06-30 | 2021-09-14 | 湖南双达机电有限责任公司 | Hydraulic system, engineering vehicle and high-speed traction method |
| 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 |
| CN113983009A (en) * | 2021-10-28 | 2022-01-28 | 三一重机有限公司 | Fan rotating speed control system, fan rotating speed control method and engineering machinery |
| 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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| CN103511403B (en) | 2016-01-20 |
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