JP2009144556A - Radiator for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a radiator for a vehicle with improved cooling performance, without increase in size of a radiator body or a cooling fan and without generation of a crack in a component caused by heat shock. <P>SOLUTION: The radiator for the vehicle cools cooling water of an engine, comprises: a heat radiation core in which a plurality of tubes and fins are arranged; an inlet tank disposed at one end of the heat radiating core and communicating with each one end of the plurality of tubes; and an outlet tank disposed at the other end of the heat radiating core to communicate with each of the other ends of the plurality of tubes. A condensate discharge passage discharging condensate to the outside of the vehicle, wherein the condensate is generated in a cooling device mounted on the vehicle passes through the heat radiating core, and the condensate cools the cooling water flowing in the tube. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention includes a heat dissipating core in which a plurality of tubes and fins are disposed, an inlet tank disposed at one end of the heat dissipating core and communicated with one end of the plurality of tubes, and the plural heat dispersers disposed at the other end of the heat dissipating core. The present invention relates to a vehicle radiator that includes an outlet tank communicated with the other end of the tube and is mounted on a vehicle to cool the cooling water of the engine.

  Since an engine mounted on a vehicle is driven at a high temperature and a high pressure, the engine is always heated while the engine is running. If the temperature of the cylinder wall of the engine exceeds a certain temperature due to heating while the vehicle is running, the thermal efficiency of the engine will deteriorate and the output will decrease. For this reason, it has been conventionally practiced to keep the temperature of the cylinder wall of the engine constant with an engine cooling device centered on a radiator using cooling water. The engine cooling device applies heat generated by the engine to the cooling water, dissipates the heat of the high-temperature cooling water into the air by the radiator, and again dissipates the cooling water which has been cooled by the radiator to the low temperature. It is configured to return to the engine.

  The radiator constitutes a part of such an engine cooling device, and includes a heat dissipating core in which a plurality of tubes and fins are disposed, and an inlet disposed at one end of the heat dissipating core and communicated with one end of the plurality of tubes. It is comprised from the tank and the outlet tank arrange | positioned at the other end of the said thermal radiation core, and was connected with the other end of these tubes. In the radiator, the cooling water that has been heated by the heat generated by the engine passes through a tube disposed in the heat radiating core. At that time, the cooling air guided by a cooling fan called a cooling fan takes the heat of the cooling water that has become high temperature and cools it.

By the way, in recent years, exhaust gas regulations tend to be strengthened, so that the thermal load of the engine tends to increase. Therefore, improvement in the cooling performance of the radiator is required, and this is addressed by increasing the size of the radiator or increasing the diameter or speed of the cooling fan.
However, increasing the size of the radiator has problems that it is difficult to secure a mounting space for the radiator, and that even if the mounting space can be secured, the ground clearance is lowered and the running performance deteriorates. Further, there is a problem that noise generated by the cooling fan becomes large when the diameter of the cooling fan is increased or the speed is increased. In order to suppress noise, there is a method of attaching a noise cover to the cooling fan. However, in this case, problems such as an increase in weight and cost due to the noise cover occur.

  Therefore, as a technique for improving the cooling performance, Patent Document 1 discloses a water supply unit that supplies water for cooling the radiator to the radiator, and a first unit that is connected to the water supply unit and stores the water. 1 water storage container and a second water storage container connected to the first water storage container via a connection pipe, respectively, for supplying water to the first water storage container Discloses a technology that makes it possible to introduce condensed water generated from an evaporator of an air conditioner.

Japanese Patent Laid-Open No. 2003-127652

  However, in the technique disclosed in Patent Document 1, water is directly applied to the tube in the heat radiating core constituting the radiator. Since the high-temperature cooling water passes through the inside of the tube, the tube may be cracked by heat shock when water is directly applied to the tube.

  Accordingly, in view of the problems of the prior art, the present invention provides a vehicle radiator having an improved cooling performance without increasing the size of the radiator body and the cooling fan and without causing cracks in parts due to heat shock. With the goal.

  In order to solve the above problems, in the present invention, a heat dissipating core in which a plurality of tubes and fins are disposed, an inlet tank disposed at one end of the heat dissipating core and communicated with one end of the plurality of tubes, An outlet tank disposed at the other end and communicated with the other ends of the plurality of tubes, and for a vehicle radiator for cooling engine cooling water, condensate water generated in a cooling device mounted on the vehicle is removed from the vehicle. The condensed water discharge flow path for discharging to the inside is disposed so as to pass through the heat radiating core, and the cooling water flowing in the tube is cooled by the condensed water.

  The condensed water discharge flow path generated in the cooling device is arranged to pass through the heat radiating core, and the cooling water in the tube is cooled by the condensed water, thereby improving the cooling efficiency of the radiator. Therefore, it is not necessary to increase the size of the radiator, and further downsizing is possible. In addition, since the condensed water discharge passage is disposed through the heat radiating core without passing the condensed water directly on the tube in the heat radiating core, cracks or the like of the tube due to heat shock are less likely to occur.

In addition, the cooling device is usually used more frequently as the outside air temperature becomes higher, and the amount of condensed water used for cooling the cooling water increases. Therefore, since the condensed water is used for cooling the cooling water, the cooling efficiency of the radiator increases as the outside air temperature increases.
The radiator is required to have higher cooling efficiency as the outside air temperature becomes higher, but according to the present invention, this requirement can be satisfied.

Further, the condensed water discharge channel is made to pass through the heat radiating core so as not to contact the tube.
The contact surface between the condensed water discharge passage and the tube is eliminated by preventing contact between the condensed water discharge passage through which the cold condensed water flows and the tube through which hot cooling water flows inside. Generation of cracks is eliminated.

The condensed water discharge flow path may be passed through the tube to form a double pipe by the tube and the condensed water discharge flow path.
Thereby, since the high-temperature cooling water flows in the tube while being in contact with the outer surface of the condensed water discharge channel, the cooling efficiency of the cooling water is further improved.

In addition, an inlet sub-tank and an outlet sub-tank for condensed water are provided in the inlet tank and the outlet tank, respectively, and the condensed water discharge passage is connected to the condensed water from the cooling device to the inlet sub-tank, the radiator core, and the The outlet sub-tank is formed to flow in order, and the condensed water discharge channel is branched into a plurality of portions between the inlet sub-tank and the outlet sub-tank.
By branching the condensed water discharge flow path in the heat radiating core, the condensed water discharge flow path can be distributed and arranged in the heat radiating core so as to increase the cooling efficiency of the cooling water. Further, by providing the inlet subtank and the outlet subtank, the condensed water discharge channel from the cooling device to the inlet subtank and the outlet subtank and subsequent ones may be one channel, and the arrangement of the condensed water discharge channel outside the heat radiating core is complicated. It will not become.

As described above, according to the present invention, it is possible to provide a radiator with improved cooling performance without increasing the size of a radiator or a cooling fan and without causing cracks in parts due to heat shock.
It is also possible to reduce the size of the radiator and cooling fan. By reducing the size, the degree of freedom of layout on the vehicle is increased, the weight is reduced, the manufacturing cost is reduced, and the running performance is improved by increasing the ground clearance. Is achieved. Furthermore, the diameter of the cooling fan can be reduced, and noise reduction during operation of the cooling fan is achieved.
Further, since the condensed water is allowed to pass through the heat radiating core, the cooling fan operating frequency is reduced, so that noise during fan operation is also reduced.

  Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention unless otherwise specified, but are merely illustrative examples. Not too much.

FIG. 1 is a schematic explanatory diagram of a bus equipped with a radiator according to the first embodiment.
A bus 1 indicates a rear engine bus on which an engine 2 is mounted on the rear side, and cooling water is circulated and supplied to the engine 2 via a radiator 4 so as to be maintained at a constant temperature. That is, the cooling water is sent to the radiator 4 through the circulation flow path 3a, cooled by the radiator 4 as will be described later, and sent to the engine 2 through the circulation flow path 3b to cool the engine 2 again. Recycled.

  In addition, a cooling device 5 is provided on the roof portion at the rear of the bus 1. The cooling device 5 is configured such that refrigerant from a compressor (not shown) driven by the engine 2 is supplied to an evaporator (not shown) installed on the roof. When the cooling device 5 is operated, cold air is blown into the cabin 7 from the plurality of cold air outlets 6. Further, the condensed water generated from the evaporator that cools the air in the cabin 7 by operating the cooling device 5 passes through the condensed water discharge channel 8 that is open to the atmosphere at one end to the radiator 4 below from the roof portion. As will be described later, the cooling water of the engine is cooled by the radiator 4 and then discharged outside the vehicle.

Next, a schematic configuration of the radiator 4 will be described.
FIG. 2 is a schematic explanatory diagram of the radiator 4 according to the first embodiment, and FIG. 3 is an enlarged view of a portion A in FIG. Based on FIG.2 and FIG.3, the radiator 4 which concerns on Example 1 is demonstrated roughly.
A plurality of tubes 41 (only one is shown in FIG. 2) are disposed in the radiator 4. Fins 42 are provided between the tubes 41 so that the tubes 41 and the fins 42 are alternately present.
The fins 42 are configured so that low-temperature air can be introduced by a cooling fan (not shown). Further, a condensed water discharge passage 8 for discharging condensed water generated by operating the cooling device 5 to the outside of the vehicle passes through the tube 41, and a double pipe by the tube 41 and the condensed water discharge passage 8 is formed. Is formed.

The radiator 4 will be described in detail with reference to FIGS. 4 and 5.
FIG. 4 is a partial perspective view of the radiator 4, and FIG. 5 is a partial cross-sectional view of the radiator 4.
The radiator 4 includes an inlet tank 43, a heat radiating core 40, and an outlet tank 44, and the heat radiating core 40 is disposed between the inlet tank 43 and the outlet tank 44. The heat radiation core 40 is configured such that a plurality of tubes 41 and fins 42 are alternately present. The tube 41 has one end communicating with the inlet tank 43 and the other end communicating with the outlet tank 44. Yes.
Further, an inlet subtank 81 is provided in the inlet tank 43, and an outlet subtank 82 is provided in the outlet tank 44.

The condensed water discharge channel 8 extends from the cooling device 5 and is connected to an inlet subtank 81 in the inlet tank 43, and is branched into a plurality of branch channels 8 a, 8 b, and 8 c via the inlet subtank 81. . The plurality of branch flow paths 8a, 8b, and 8c pass through the tube 41, and a double pipe is formed by the tube 41 and the branch flow paths 8a, 8b, and 8c. The branch channels 8 a, 8 b, 8 c are connected to the outlet sub tank 82 at the end opposite to the inlet sub tank 81, and return to the single condensed water discharge channel 8 through the outlet sub tank 82.
That is, the condensed water discharge channel 8 is branched into branch channels 8a, 8b, and 8c between the inlet sub-tank 81 and the outlet sub-tank 82, and the branch channels 8a, 8b, and 8c pass through the tube 41. It is the composition to do.
In this way, the condensed water discharge channel 8 is branched only between the inlet sub-tank 81 and the outlet sub-tank 82, and thus the condensed water discharge channel 8 is a single channel outside the radiator 4. The channel shape is not complicated.
In the first embodiment, the condensed water discharge channel 8 is branched into the branch channels 8a, 8b, and 8c via the inlet sub tank 81. However, the number of branches is not limited to this. Further, it is not necessary to configure the branch flow path to pass through all the tubes 41. The number of branches can be freely set according to the amount of condensed water expected to be generated in the cooling device 5, the thickness of the tube, and the like.

Next, cooling of the engine coolant using the radiator 4 will be described.
First, the flow of engine cooling water cooled by the radiator 4 will be described.
Cooling water, which has been heated by the heat generated by the engine 2 and has reached a high temperature, is introduced into an inlet tank 43 constituting the radiator 4 from an inlet (not shown) through a circulation passage 3a. The cooling water introduced into the inlet tank 43 is cooled by passing through the plurality of tubes 41 and introduced into the outlet tank 44. Cooling water that has been cooled and introduced into the outlet tank 44 returns to the engine 2 through a circulation passage 3b from a discharge port (not shown). That is, the cooling water circulates in the order of the engine 2 → the circulation flow path 3 a → the inlet tank 43 → the tube 41 → the outlet tank 44 → the engine 2.

Next, the flow of condensed water generated in the cooling device 5 will be described.
The condensed water generated by operating the cooling device 5 is introduced into the inlet sub-tank 81 in the inlet tank 43 through the condensed water discharge passage 8. The condensed water introduced into the inlet sub-tank 81 is sent to the outlet sub-tank 82 through the branch channels 8a, 8b, 8c branched into a plurality of branches, and is discharged from the outlet sub-tank 82 to the outside by the condensed water discharge channel 8. Is done.

Next, the flow of cooling air will be described.
Cooling air guided to the heat radiating core 40 by a cooling fan (not shown) is discharged outside the heat radiating core 40 through the fins 42 constituting the heat radiating core 40.

As described above, since the cooling water, the condensed water, and the cooling air flow in the radiator 4, the cooling water is cooled and dissipated by the condensed water and the cooling air when flowing in the tube 41.
Therefore, since cooling water is added to cooling air and it cools using the condensed water which generate | occur | produces with the cooling device 5, cooling efficiency improves.

FIG. 6 is a partial cross-sectional view of the radiator 4 according to the second embodiment.
The radiator 4 according to the second embodiment shown in FIG. 6 differs from the radiator according to the first embodiment shown in FIG. 5 only in the difference between the inlet sub-tank 81 and the outlet sub-tank 82, and the other parts will be described. Is omitted.

The condensed water discharge channel 8 extends from the cooling device 5 and is connected to an inlet subtank 81 in the inlet tank 43, and a condensed water channel 8 </ b> A is connected through the inlet subtank 81. The condensed water flow path 8A is connected to the outlet sub tank 82 at the end opposite to the inlet sub tank 81, and returns to the single condensed water discharge flow path 8 through the outlet sub tank 82.
In the second embodiment, only one condensed water flow path 8A is provided, but the number is not limited to this, and a plurality of condensed water flow paths 8A may be provided between the inlet sub tank 81 and the outlet sub tank 82.
That is, the condensed water discharge channel 8 is configured to be one or a plurality of condensed water channels between the inlet sub-tank 81 and the outlet sub-tank 82.

  By configuring in this way, the cooling water of the engine is cooled by using the condensed water generated in the cooling device 5 in addition to the cooling air as in the first embodiment, so that the cooling efficiency is improved.

  Since the tube 41 can be diverted to the condensed water flow path 8A, a conventional radiator that does not allow the condensed water discharge flow path 8 to pass through is modified to implement the present invention as shown in FIG. The shape can reduce the cost of modification.

In the first and second embodiments, the example in which the radiator is mounted on the bus as shown in FIG. 1 has been described. However, the vehicle on which the radiator of the present invention is mounted is not limited to the bus, and a truck, a passenger car, and the like. Other vehicles may be used.
However, in a vehicle having a large cabin such as a bus, the capacity of the cooling device for cooling the cabin is large, so that the amount of condensed water generated increases, and therefore the degree of improvement in the cooling capability of the radiator increases. Therefore, it is more preferable that the radiator of the present invention is mounted on a vehicle having a large cabin such as a bus.

  The radiator body and the cooling fan can be used as a radiator with improved cooling performance without increasing the size of the radiator body and the cooling fan and without causing cracks in parts due to heat shock.

It is a schematic explanatory drawing of the bus | bath which mounts the radiator which concerns on Example 1. FIG. 1 is a schematic explanatory diagram of a radiator 4 according to Embodiment 1. FIG. It is the A section enlarged view in FIG. 1 is a partial perspective view of a radiator according to Embodiment 1. FIG. 1 is a partial cross-sectional view of a radiator according to Embodiment 1. FIG. 6 is a partial cross-sectional view of a radiator according to Embodiment 2. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bus 2 Engine 3a Circulation flow path 3b Circulation flow path 4 Radiator 5 Cooling device 6 Cold air blower outlet 7 Guest room 8 Condensate water discharge flow path 8A Condensed water flow paths 8a, 8b, 8c Branch flow path 40 Heat radiation core 41 Tube 42 Fin 43 Inlet Tank 44 Outlet tank 81 Inlet subtank 82 Outlet subtank

Claims (4)

A heat dissipating core in which a plurality of tubes and fins are disposed, an inlet tank disposed at one end of the heat dissipating core and communicated with one end of the plurality of tubes, and a plurality of tubes disposed at the other end of the heat dissipating core. In a vehicle radiator comprising an outlet tank communicated with an end and cooling engine cooling water,
A condensed water discharge passage for discharging condensed water generated in a cooling device mounted on the vehicle to the outside of the vehicle is disposed through the heat radiating core, and the cooling water flowing in the tube by the condensed water is disposed. A radiator for a vehicle, characterized by being configured to cool.   The radiator for a vehicle according to claim 1, wherein the condensed water discharge passage is passed through the heat radiating core so as not to contact the tube.   3. The vehicle radiator according to claim 1, wherein a double pipe is formed by passing the condensed water discharge passage through the tube and the tube and the condensed water discharge passage. 4. In the inlet tank and the outlet tank, respectively, an inlet sub-tank for condensed water and an outlet sub-tank are provided,
The condensed water discharge flow path is formed so that condensed water flows from the cooling device in the order of the inlet sub-tank, the heat dissipating core, and the outlet sub-tank.
The radiator for a vehicle according to any one of claims 1 to 3, wherein a condensed water discharge channel is branched into a plurality of portions between the inlet sub-tank and the outlet sub-tank.

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