KR20140000457A - A cooling device of remote fan for construction equipment - Google Patents

Abstract

The present invention relates to a cooling device of a remote fan for construction equipment and, more particularly, to a cooling device of a remote fan for construction equipment capable of preventing sudden unintended acceleration, which happens at the initial point of the start-up of the cooling device, by applying an opening and closing part which is kept open constantly. The present invention comprises a pumping part for supplying operational oil; a cooling part operated by the operational oil supplied by the pumping part; an opening and closing part connected to the cooling part parallel on a channel for the operational oil being supplied to the cooling part to control the operation of the cooling part; and a control part for controlling the opening and closing of the opening and closing part by applying a signal to the opening and closing part. The opening and closing part is an all-the-time-opened opening and closing part which is kept opened if there is no signal of the control part. If the signal of the control part is applied, the opening and closing part is closed and operates the cooling part. Sudden unintended acceleration at the initial point of the start-up of the cooling device of a remote fan for construction equipment is prevented. And the present invention lengthens the life span of the cooling device for a remote fan for construction equipment by preventing the cavitation of a rotational part when the operation is halted.

Description

Remote fan chiller for construction equipment {A COOLING DEVICE OF REMOTE FAN FOR CONSTRUCTION EQUIPMENT}

The present invention relates to a remote fan cooling device for construction equipment, and more particularly to a remote fan cooling device for construction equipment that can prevent the rapid acceleration occurring at the initial start of the cooling device by applying the opening and closing portion which is always kept open. It is about.

In general, a lot of heat is generated in the engine, hydraulic parts, torque converter of the construction machinery. Cooling modules such as radiators, oil coolers and torque converter coolers are installed to cool these parts.

Coolers often have fans for cooling. The fan drive may be driven directly by the engine or may be driven by a hydraulic pump and a motor.

The cooling fan is rotated by a motor supplied with operating oil from a pump driven by the engine.

An opening and closing portion is provided between the motor and the pump to limit the speed of the cooling fan.

The opening and closing portion is opened and closed by a control unit for sensing the temperature of the cooling module. If there is no opening, the rotational speed of the pump will be proportional to the motor speed.

Therefore, the control unit controls the operating flow rate of the motor through the opening and closing control of the opening and closing part to adjust the rotation speed of the motor.

Opening and closing part as described above adopts a control method that is always kept in the closed state when the operation of the cooling device.

Therefore, immediately after the engine is turned on, immediately after the engine is started, the entire discharge flow rate of the pump is delivered to the motor regardless of the temperature of the cooling module, thereby rapidly accelerating, thereby causing damage to the motor.

In addition, when the cooling device is stopped, there is a problem in that the motor flow is insufficient due to the rotational inertia of the fan, which leads to cavitation, resulting in damage to internal parts of the motor.

In order to prevent the above cavitation, a separate check valve must be configured, which leads to a cost increase.

Prior art related to the present invention is Republic of Korea Patent No. 10-0435537, the prior art describes a technology related to the vehicle oil cooling system.

The present invention is to provide a remote fan cooling device for construction equipment to improve durability by blocking the rapid acceleration of the start-up cooling unit of the remote fan cooling device for construction equipment to prevent the damage caused by this.

Another object of the present invention to provide a remote fan cooling device for construction equipment that can extend the service life by eliminating the phenomenon of the cavitation of the rotating unit when the operation stop of the remote fan cooling device for construction equipment.

In addition, the remote fan cooling device for construction equipment does not provide a separate check valve for preventing cavitation to provide a remote fan cooling device for construction equipment that can reduce the manufacturing cost.

The present invention, the pumping unit for supplying the working oil; A cooling unit driven by operating oil supplied from the pumping unit; An opening / closing part connected in parallel with the cooling part on a working oil flow path supplied to the cooling part to control driving of the cooling part; And a control unit which controls the opening and closing of the opening and closing unit by applying a signal to the opening and closing unit, wherein the opening and closing unit is a normally open opening and closing unit which maintains an open state when there is no signal from the control unit. Is closed to drive the cooling unit, characterized in that to prevent the rapid acceleration of the cooling unit at the beginning of the start of the remote fan cooling device for construction equipment.

The cooling unit may include a rotating unit driven by operating oil supplied from the pumping unit; And a cooling fan that is coupled to the rotating part and rotates.

The control unit may include a temperature sensor configured to detect a temperature of the cooling object. When the temperature of the cooling object exceeds a preset reference temperature, the controller may block the opening and closing unit to drive the cooling unit.

The opening and closing part may further include an auxiliary operation unit for supplying an auxiliary opening and closing operation force of the opening and closing part.

In addition, the auxiliary operation unit may be supplied with a signal for controlling the opening and closing portion from the control unit to supply the auxiliary operating force to the opening and closing portion.

The present invention, by applying the normally open opening and closing portion to the remote fan cooling device for construction equipment to prevent rapid acceleration of the cooling unit when the cooling device is operated, thereby bringing the effect of improving durability.

In addition, the present invention has the effect of extending the service life of the rotating part by eliminating the phenomenon of cavitation of the rotating part when the operation stop of the remote fan cooling device for construction equipment.

In addition, the present invention does not install a separate check valve for preventing cavitation brings the effect of reducing the manufacturing cost.

1 is a hydraulic circuit diagram showing a remote fan cooling device for a conventional construction equipment,
2 is a hydraulic circuit diagram of a remote fan cooling device for construction equipment according to a preferred embodiment of the present invention;
Figure 3 is a hydraulic circuit diagram of a remote fan cooling device for construction equipment showing another preferred embodiment of the present invention.

Hereinafter, the present invention will be described in detail with reference to preferred embodiments of the accompanying drawings.

The drawings and the description below are for a preferred embodiment of the various methods for effectively explaining the features of the present invention, the scope of the present invention by the embodiments of the drawings and description presented in the specification of the present invention It is not limited.

In addition, in describing the present invention, when it is determined that the detailed description of the related known function or configuration may obscure the gist of the present invention, the detailed description thereof will be omitted.

In addition, in order to efficiently describe the technical components constituting the present invention is provided in each functional configuration, or the functional configuration of the structure typically provided in the technical field to which the present invention belongs, omit possible, additionally for the present invention It mainly describes the functional configuration to be provided.

1 is a hydraulic circuit diagram showing a remote fan cooling apparatus for a conventional construction equipment.

Remote fan cooling apparatus for construction equipment according to the prior art comprises a rotary module 1 for rotating the cooling module 3 and the cooling fan 2 and the cooling fan 2 as shown in FIG.

In addition, it is provided with a pumping part (6) for supplying hydraulic oil to the rotating part (1).

Then, the temperature sensor 4 and the control unit 5 for sensing the temperature of the cooling module 3 is arranged.

Then, the normally closed valve 7 provided between the pumping part 6 and the rotating part 1 is connected in parallel.

Therefore, when driving a remote fan cooling device for construction equipment, all of the hydraulic oil pumped from the pumping part 6 is supplied to the rotating part 6 to generate a load due to rapid acceleration and damage to the parts.

In addition, when the driving of the remote fan cooling device for construction equipment is stopped due to inertial rotation of the cooling fan 2, the cavitation phenomenon occurs due to the flow rate of the inlet side of the rotating part (6).

Cavitation is a phenomenon in which a cavity is formed in a fluid due to a change in pressure caused by a change in velocity of the fluid, which is also called a cavity phenomenon.

When a low pressure occurs in a fluid, the gas contained in the fluid separates and creates an empty space without fluid.

Cavitation phenomenon from the perspective of a pump motor that is rotated by a pump or working oil is caused by the inflow of air bubbles into the pump or by air bubbles at the inlet port, and the shock waves generated by the collapse of the air bubbles in the pump cause impellers and casings. It destroys the inside of the same part.

As a result, the noise and vibration of the pump or motor increase, the flow rate, the lift, the efficiency decreases, and the life of the parts is shortened and failures are caused.

In this case, the conventional remote fan cooling device for construction equipment needs to install a separate check valve (C) in the flow path to supplement the supply flow rate of the rotating part (6) by using the discharged working oil.

Therefore, the manufacturing cost of the remote fan cooling device for construction equipment is increased due to the additional check valve (C) installation.

2 is a view showing a hydraulic circuit of the remote fan cooling device 10 for construction equipment according to an embodiment of the present invention.

The present invention provides a cooling unit 200 on a pumping unit 100 for pumping hydraulic oil and a cooling unit 200 driven by the pumped hydraulic oil and a flow path connecting the cooling unit 200 and the pumping unit 100. The control unit 400 is connected in parallel to the opening and closing unit 300 for selecting whether to drive the cooling unit and the control unit 400 by applying a signal to the lap unit 300.

The opening and closing part 300 is a normally open type opening and closing part to maintain an open state when there is no signal from the control part 400, and when the signal from the control part 400 is applied, the opening and closing part 300 is closed and the cooling part 200 Drive) and is configured to prevent rapid acceleration of the cooling unit 200 at the initial stage of startup of the remote fan cooling apparatus 10 for construction equipment.

In addition, the cooling object of the cooling unit 200, that is, the cooling module 900 is cooled by the cooling unit 200 is provided.

The pumping unit 100 may be implemented by configuring an oil pump for pumping the hydraulic oil by the drive unit.

The cooling unit 200 is composed of a rotating unit 220 and the cooling fan 240.

The rotating unit 220 may be implemented by forming a hydraulic fluid inlet and outlet in a housing having a predetermined shape, and a gear (not shown) that is rotatably coupled.

In the driving method, the hydraulic oil pumped from the pumping part 100 flows into the inlet of the rotating part 220, and then rotates a gear (not shown) by a pumping pressure (50 to 200 kg / 1cm 2) and is discharged to the outlet. .

The cooling fan 240 is rotatably coupled to the rotating part 220, and may be configured to be directly connected to a gear (not shown) shaft of the rotating part 220.

As a connection method, it can be implemented by various methods, such as coupling or the fastening method by a key and a key groove.

The cooling module 900 is cooled by the cooling air generated while the cooling fan 240 rotates.

The cooling module 900, which is a cooling object of the present invention, may be a writer, an oil cooler, or a torque converter cooler of construction equipment.

The control unit 400 of the present invention may be implemented with a temperature sensor 420 for detecting the temperature of the cooling module 900.

The sensing range of the temperature sensor 420 is configured to sense any one of the surface or the internal temperature of the cooling module 900.

Alternatively, a plurality of sensors may be configured to sense both the surface and the internal temperature of the cooling module 900.

In the sensing of the internal temperature of the cooling module 900, the cooling module 900 may be inserted into the cooling module 900 and may be configured in various ways depending on the RTD sensor.

In addition, the controller 400 may set the reference temperature T of the cooling module 900.

When the temperature of the cooling module 900 exceeds the reference temperature T of the control unit 400 or cools below, the opening / closing signal is applied to the opening / closing unit 300.

The controller 400 receives the internal or external surface temperature of the cooling module 900 from the temperature sensor 420 provided in the cooling unit 200.

In this case, the controller 400 may select one of the internal temperature and the external surface temperature of the cooling module 900 as a reference and set the reference temperature T of the cooling unit 200.

In addition, when the temperature sensor 420 senses both the internal and external surface temperature of the cooling module 140, the controller 400 may set the average value of the internal and external temperatures as the reference temperature (T).

In addition, the plurality of reference temperatures T divided into the outside and the outside of the cooling module 900 may be set so as to manage the respective temperatures of the internal temperature and the external surface temperature of the cooling module 900.

In addition, the control unit 400 may be implemented by configuring a control circuit for calculating the drive current of the opening and closing unit 300.

In the present embodiment, the opening and closing unit 300 is electrically connected to the control unit 400, and is opened and closed in accordance with the current signal of the control unit 400.

The opening and closing unit 300 is preferably carried out by applying an electronic proportional valve (Electronic proportional valve).

The electromagnetic proportional valve has an electromagnet and a valve, and opens or closes the valve while varying the magnetic force by energization of the electromagnetic coil to flow or block the fluid.

The electromagnetic proportional valve is a valve for appropriately adjusting the flow rate of the fluid according to the energized current, and is used in the field for the purpose of precisely adjusting the flow rate.

In the present embodiment, the electromagnetic proportional valve is provided in the control unit 400 and energizes the driving circuit with a DC current calculated and transmitted by a control circuit having a calculation function.

The energized current operates the drive circuit, and the valve regulates the flow rate of the fluid by the operation of the drive circuit.

Electronic proportional valves are generally divided into energized open and energized closed methods.

In the case of applying the energized open method, the negative control method and the energized closed method electromagnetic proportional valve are also referred to as positive control methods.

In the present invention, the electromagnetic proportional valve having the energization closing method which is the positive control method described above is applied.

That is, when the current does not pass, it is normally open, and when receiving the current signal from the controller 400, the valve is closed to shut off the hydraulic oil discharged to the parallel flow path 860.

In addition, in the present embodiment, the electromagnetic proportional valve is not closed immediately but gradually closes to sequentially increase the operating flow rate delivered to the cooling unit 200.

Therefore, it is possible to prevent component failure by eliminating sudden acceleration of the cooling unit 200 due to sudden increase in operating flow rate.

In order to operate the components as described above, the respective components of the cooling device are connected to form a flow path through which the working oil can pass.

First, an input flow path 820 connecting the inlet port of the rotating part 220 and the pumping part 100 is provided.

At this time, the longer the length of the input flow path 820 is configured to not exceed a predetermined length because the hydraulic pressure may be lowered in the transfer process.

In addition, the discharge passage 860 of the working oil discharged through the outlet of the rotating unit 220 is provided.

In addition, a parallel flow path 860 is formed to connect the input flow path 820 and the discharge flow path 840 so that the opening and closing parts 300 are connected in parallel, and the opening and closing part 300 is provided at the center.

The present invention can be implemented with a hydraulic oil tank 600 as shown in FIG.

The hydraulic oil suction port of the pumping part 100 and the discharge port of the discharge passage 840 may be arranged in a tank.

With the configuration as described above, the hydraulic oil tank 600 may recover the hydraulic oil returned from the cooling unit 200 or the opening / closing unit 300 while supplying the hydraulic oil to the pumping unit 100.

Therefore, it is not necessary to provide separate hydraulic oil supply tank and drain tank, and hydraulic oil recycling becomes possible.

3 is a hydraulic circuit diagram 10 of a remote fan cooling device for construction equipment showing another embodiment according to the present invention.

In this embodiment, the opening and closing part 300 was carried out in a configuration that further includes an auxiliary operation unit 500 for supplying the auxiliary opening and closing operation force.

When the driving capacity of the cooling device is high, the pumped hydraulic pressure of the hydraulic oil also increases proportionally.

As a result, the smooth opening and closing operation of the driving circuit provided in the opening and closing part 300 may be affected.

Therefore, in this embodiment, the auxiliary operation unit 500 further supports the opening and closing operation force of the opening and closing part 300.

Preferred auxiliary operation unit 500 may be implemented by configuring a pilot pump and a pilot circuit capable of quantitative operation.

To this end, a pilot part is provided in a driving circuit for opening / closing the opening / closing part 300, and the pilot pump and a flow path connecting the same are provided.

That is, when the driving circuit of the opening part 300 is energized so that the opening and closing part 300 is closed by itself, the pilot pump simultaneously drives, thereby supplementing the driving force to the opening and closing part 300 through the fixed amount hydraulic pressure. To convey.

For this configuration, the driving circuit of the opening and closing unit 300 may include a transmitting unit, and the pilot pump may include a receiving unit so that the pilot pump may be driven at the same time as the opening and closing unit 300 is driven.

In addition, the auxiliary operation unit 500 may be configured to receive a signal for controlling the opening and closing unit 300 from the control unit 400 to supply the auxiliary operating force to the opening and closing unit 300.

The control unit 400 and the receiving unit provided in the auxiliary operation unit 500 is electrically connected.

Accordingly, the control unit 400 transmits the open / close signal to the open / close unit 300 and simultaneously transmits the open / close signal to the auxiliary operation unit 500 to enable simultaneous driving.

In this configuration, even when the driving circuit 300 does not operate due to an electrical problem, the opening and closing unit 300 can be opened and closed by the hydraulic pressure of the auxiliary operation unit 500.

In addition, in the embodiment of the present invention, as shown in the accompanying drawings, the fan motor 700 that accommodates the rotating part 220 and the opening / closing part 300, that is, used as a single module for accommodating the components of the cooling device therein. Can be.

The fan motor 700 may be implemented to surround the internal parts in a cylindrical housing or case shape, or may be further provided with a fixed base part (not shown) to facilitate installation.

In addition, the fan motor 700 may increase convenience of use by receiving and fixing other components on the cooling device, such as the control unit 400 or the auxiliary operation unit 500, inside or on the surface as necessary.

Hereinafter will be described the operation sequence of the remote fan cooling device 10 for construction equipment according to the present invention.

First, the user drives the pumping unit 100 by turning on an engine start to drive a remote fan cooling device for construction equipment.

The pumping unit 100 pumps hydraulic oil and transfers the hydraulic oil to the input channel 820.

At this time, since the opening and closing part 300 is always maintained in the open state, the pumped hydraulic oil in the input flow path 820 is discharged and returned to the working oil tank 600 along the open parallel flow path 860.

Therefore, the delivery pumping pressure delivered to the cooling unit 200 of the present invention is reduced, it is possible to prevent the sudden start of the cooling unit due to the pumping pressure generated at the beginning of the start of the remote fan cooling device 10 for construction equipment .

At the same time that the start of the remote fan cooling device for construction equipment is turned on, the controller 400 receives the temperature of the cooling module 900 through the temperature sensor 420 of the controller 400.

When the detected temperature of the cooling module 900 is less than or equal to the set value of the reference temperature T of the cooling module 900, since the controller 400 does not transmit the opening / closing signal to the opening / closing unit 300, the pumped hydraulic fluid Subsequently, it is returned along parallel channel 860.

When the detected temperature of the cooling unit 200 is greater than or equal to a set value of the cooling unit reference temperature T, the controller 400 transmits the DC current calculated by the opening and closing unit 300.

The open / close unit 300 which is normally opened is gradually closed in response to the current signal, and blocks the parallel channel 860.

Therefore, the hydraulic oil pumped from the pumping unit 100 gradually increases the supply amount to the cooling unit 200, and the rotation speed of the cooling fan 240 and the pressure of the hydraulic oil also increase.

As the pressure of the hydraulic oil rises, the rotational force of the rotating unit 220 provided in the cooling unit 200 also increases in proportion, and cools the cooling module 900 by the rotation of the cooling fan 240.

At this time, the controller 400 continuously detects the temperature of the cooling module 900 in real time through the temperature sensor 420.

When the temperature of the cooling module 900 is cooled below the set value of the reference temperature T set in the control unit 400, the control unit 400 cuts off the current signal transmitted to the open / close unit 300 to open and close the unit. (300) Switch to the open state.

The parallel passage 860 passes through the opening / closing unit 300, the pumped hydraulic oil is returned, and the cooling unit 200 gradually stops driving.

When the temperature of the cooling unit 200 rises above the reference temperature T setting value, the controller 400 repeats the above process by applying an opening / closing signal to the opening / closing unit 300 again. Keep 900 below a certain temperature.

When the operation and work of construction equipment is completed and the user turns off the start, the pumping unit 100 and the control unit 300 are stopped.

The opening / closing unit 300 in a state in which there is no current signal of the control unit 300 returns to its original state again.

When the rotating unit 220 of the cooling unit 200 is being driven at the start-off time of construction equipment, the rotating unit 220 rotates by a predetermined number of times without pumping pressure due to the rotational inertia of the cooling fan 240.

In this case, the cavitation phenomenon due to the supply hydraulic oil shortage occurs on the inlet side of the rotary part 220.

However, the parallel passage 860 is opened by the opening and closing of the opening and closing portion 300, and thus, the hydraulic oil in the discharge passage 840 may be circulated and supplemented to the input passage 820 through the parallel passage 860. It is possible to prevent the lack of the operating oil inflow amount of the inlet of the rotary part 220.

Therefore, it is possible to prevent the cavitation phenomenon of the rotating unit 220 when the cooling device is OFF without installing a separate check valve (C).

As a result, by applying the normally open opening and closing portion in the hydraulic circuit, it is possible to improve the durability by preventing the rapid acceleration of the cooling unit 200 during operation of the remote fan cooling device 10 for construction equipment.

In addition, there is an effect that can extend the service life of the remote fan cooling device 10 for construction equipment by eliminating the cavitation (cavitation) phenomenon of the rotary unit 220 when the operation stop of the remote fan cooling device 10 for construction equipment.

In addition, it does not install a separate check valve for preventing the cavitation has the effect of reducing the manufacturing cost.

The above embodiments are merely illustrative of preferred embodiments of the present invention, and the scope of application of the present invention is not limited to the above, and may be appropriately changed within the scope of the same idea.

Accordingly, the shape and structure of each component shown in the embodiments of the present invention can be modified and carried out, and such modifications are naturally within the scope of the appended claims.

10; Remote fan chiller for construction equipment
100; Pumping part
200; Cooling section
220; Rotating part 240; Cooling fan
300; draw
400; A controller 420; temperature Senser
500; Auxiliary operation unit
600; Hydraulic oil tank
700; Fan motor
820; Input channel 840; Discharge flow path
860; Parallel flow path
900; Cooling Module

Claims (5)

A pumping unit for supplying hydraulic oil;
A cooling unit driven by operating oil supplied from the pumping unit;
An opening / closing part connected in parallel with the cooling part on a working oil flow path supplied to the cooling part to control driving of the cooling part; And
And a control unit controlling the opening and closing of the opening and closing unit by applying a signal to the opening and closing unit.
The opening and closing part is a normally open type of the opening and closing part to maintain the open state when there is no signal from the control unit, when the signal of the control unit is applied, the opening and closing part is closed to drive the cooling unit, the initial start of the remote fan cooling device for construction equipment Remote fan cooling device for construction equipment, characterized in that to prevent the rapid acceleration of the cooling unit.
The method of claim 1,
The cooling unit
A rotating part driven by the flow rate of the working oil supplied from the pumping part; And
And a cooling fan that is coupled to the rotating unit and rotates.
The method of claim 1,
The control unit
It includes; a temperature sensor for sensing the temperature of the object to be cooled,
The remote fan cooling device for construction equipment, characterized in that for closing the opening and closing unit when the temperature of the cooling object exceeds a predetermined reference temperature to drive the cooling unit.
The method of claim 1,
The opening /
And an auxiliary operation unit for supplying an auxiliary opening and closing operation force of the opening and closing part.
5. The method of claim 4,
The auxiliary operation unit
Remote fan cooling device for construction equipment, characterized in that for supplying the auxiliary operating force to the opening and receiving the control signal from the control unit the opening and closing.

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