JPH0716023Y2 - Heat dissipation device for automobile - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The heat dissipation device for an automobile according to the present invention dissipates heat from the refrigerant of the refrigerator and the cooling water of the automobile engine incorporated in the air conditioner for the automobile. To use.

(Prior Art) A vapor compression refrigerator is incorporated in an air conditioner for automobiles, but in the case of this refrigerator, it is necessary to radiate the high temperature and high pressure refrigerant discharged from the compressor with a condenser to condense and liquefy it. is there. Further, in the case of an automobile engine, in order to prevent the temperature of the cooling water from rising excessively, it is necessary to radiate this cooling water by a radiator to reduce the temperature and then return it to the water jacket of the engine.

Therefore, conventionally, as shown in FIGS. 5 and 6, the condenser 1 and the radiator 2 are arranged in series in the engine room of an automobile in the direction of air flow (left and right direction in FIG. 6). , A fan 3 which is rotationally driven by the engine via a V-belt or by a separately provided motor,
Further, by the ram pressure generated by traveling, air is blown to the condenser 1 and the radiator 2 to condense and liquefy the refrigerant flowing in the condenser 1 and lower the temperature of the cooling water flowing in the radiator 2. I have to. (See, for example, Japanese Utility Model Laid-Open No. 59-133313) (Problems to be solved by the invention) However, in the above-described heat dissipation device for an automobile, the following inconvenience has conventionally occurred.

That is, when comparing the heat radiation performance required for the radiator 2 and the heat radiation performance required for the capacitor 1, the heat radiation performance required for the radiator 2 is considerably higher than the heat radiation performance required for the capacitor 1.

For this reason, conventionally, as shown in FIG. 5, the outer dimensions of the core portion of the capacitor 1 are made smaller than the outer dimensions of the core portion of the radiator 2, but the capacitor 1 is smaller than the radiator 2 in this way. In this case, the bypass passage 4 is formed around the condenser 1 so that part of the air sent to the radiator from the front (left side in FIG. 6) does not pass through the condenser 1 and reaches the radiator 2. Will reach.

When there is a high resistance part and a low resistance part in the flow path, the air flowing in the flow path avoids the high resistance part (the core part of the capacitor 1) and the low resistance part (bypass). There is a tendency to try to flow through the passage 4).
Moreover, since the flow velocity of the wind generated by the fan 3 for sending air to the heat dissipation device is small in the central part of the fan 3 and becomes larger in the outer peripheral part, the bypass passage 4 is formed around the condenser 1.
In the case where the above is formed, most of the cooling air sent to the radiator from the front passes through the bypass passage 4 and flows toward the radiator 2.

As a result, the amount of cooling air passing through the condenser 1 becomes insufficient, and the condensation and liquefaction of the refrigerant by the condenser 1 tends to be insufficient.

For this reason, conventionally, the bypass passage 4 is closed by a closing plate. When such a closing plate is provided, a sufficient amount of air is sent to the condenser 1 to condense the refrigerant by the condenser 1. Liquefaction is surely performed.

However, when the bypass passage 4 existing around the condenser 1 is closed by the closing plate, the cooling air fed into the portion of the radiator 2 near the outer periphery of the core portion facing the closing plate is extremely reduced, The radiator 2 reduces the performance of radiating the cooling water.

The heat dissipation device for an automobile of the present invention eliminates any of the above inconveniences.

(Means for Solving the Problems) The heat dissipation device for an automobile of the present invention is, like the conventional heat dissipation device for an automobile described above, a condenser of a refrigerator constituting an air conditioner for an automobile and a leeward side of the condenser. The radiator is disposed and radiates the cooling water of the automobile engine, and a propeller-type fan that is provided further downwind of the radiator and blows air to the radiator and the condenser.

Furthermore, in the heat dissipation device for an automobile of the present invention, the outside diameter dimensions of the condenser and the radiator are made substantially the same, and
In a part of the core part of the condenser, which is aligned with the central part of the fan, there is provided a heat transfer tube that constitutes the core part and a bypass part that allows air to pass through without providing fins.

(Operation) In the case of the heat dissipation device for an automobile of the present invention configured as described above, since the external dimensions of the condenser and the radiator are formed to be substantially the same, the amount of air flowing around the condenser and flowing to the radiator is reduced. It can be suppressed to a very small level, and the ventilation of the capacitor will be good.

Part of the cooling air is part of the core of the condenser, passes through the bypass that is aligned with the center of the fan, and goes directly to the radiator without heat exchange with the condenser. Although it is sent (that is, it passes through), the flow velocity of the central part of the fan is slow, and the flow rate of the cooling air in this part is small. Therefore, the amount of cooling air sent to the condenser is not practically insufficient.

Moreover, since a sufficiently low-temperature air that has not risen in temperature is sent by the condenser to a part of the radiator core that matches the center of the fan, the cooling water heat dissipation performance in this part Is improved, and the performance of the radiator is improved as a whole.

(Embodiment) Next, the present invention will be described in more detail with reference to the illustrated embodiment.

1 and 2 show a first embodiment of the present invention, FIG. 1 is a perspective view schematically showing the entire structure, and FIG. 2 is a transverse sectional view of a central portion of FIG.

Reference numeral 1 denotes a condenser of a refrigerator that constitutes an air conditioner for an automobile. The condenser 1 communicates with an inlet tank 5 that communicates with a discharge port of a compressor (not shown) of the refrigerator and an inlet of an evaporator (not shown). A core portion 9 including a large number of heat transfer tubes 7, 7 and fins 8, 8 is provided between the outlet side tank 6 and the outlet side tank 6.

The high temperature, high pressure refrigerant vapor discharged from the compressor is fed into the inlet side tank 5 of the condenser 1 configured as described above. And this high temperature and high pressure refrigerant vapor is
While flowing through the large number of heat transfer tubes 7, 7 forming the core portion 9 toward the outlet side tank 6, heat is exchanged with the air flowing while passing through the core portion 9 to condense and liquefy, and then the outlet. It is stored in the side tank 6. The liquid refrigerant stored in the outlet side tank 6 is sent to the evaporator through an expansion valve (not shown).

A radiator 2 that dissipates the cooling water of the automobile engine is disposed on the leeward side of the condenser 1 configured as described above. This radiator 2 is the same as the condenser 1 described above.
Similarly to the above, a core portion 14 including a large number of heat transfer tubes 12, 12 and fins 13, 13 is provided between the inlet side tank 10 and the outlet side tank 11.

Further, on the leeward side of the radiator 2, a propeller-type fan 3 that blows air to the radiator 2 and the condenser 1 is arranged. A rotary shaft is fixed to the center of the fan 3, and the rotary shaft is rotated by the engine through a V-belt.
Alternatively, it can be rotationally driven by a separately provided motor.

Further, in the heat dissipation device for an automobile of the present invention, when the condenser 1 and the radiator 2 have substantially the same outer diameter dimensions and the condenser 1 and the radiator 2 are arranged in series, The bypass passage 4 as shown in FIGS. 5 to 6 is not formed.

Further, in the central portion of the core portion 9 forming the condenser 1 and the portion aligned with the central portion of the blower fan 3, the heat transfer tube 7,
The core portion 9 is opened without providing the 7 and the fins 8, 8. The opening portion of the core portion 9 is thus used as a bypass portion 15 that allows the air sent into the heat dissipation device from the front side to pass directly to the radiator 2 at the rear side without performing heat exchange.

In the case of the heat dissipation device for an automobile of the present invention configured as described above, since the external dimensions of the condenser 1 and the radiator 2 are formed to be substantially the same, the amount of air flowing around the condenser 1 and flowing to the radiator 2. Can be suppressed to a small amount,
Ventilation to the condenser 1 becomes good.

That is, the speed of the air flow caused by the propeller-type fan 3 becomes faster around the fan 3, and the condenser 1
When there is a bypass passage 4 (Figs. 5 to 6) around the periphery of the capacitor, a large amount of air flows backward through the bypass passage 4, but in the case of the heat dissipation device of the present invention, such a space is formed around the capacitor 1. Since there is no bypass passage, a large amount of air is not sent to the radiator 2 at the rear without heat exchange with the condenser 1. Further, even when air is blown to the condenser 1 and the radiator 2 by the ram pressure regardless of the fan 3, the above-mentioned state is brought about by the existence of the fan 3.

A part of the cooling air passes directly through the bypass portion 15 provided in the central portion of the core portion 9 of the condenser 1 and the condenser 1
It is sent to the radiator 2 without heat exchange between the two, but the flow velocity of the central portion of the propeller-type fan 3 is low, and the flow rate of the cooling air in this central portion is small. Therefore, the amount of air passing through the bypass portion 15 is significantly smaller than the amount of air passing through the bypass passage 4 in the conventional heat dissipation device. Therefore, in the case of the heat dissipation device of the present invention, the amount of cooling air sent to the core portion 9 of the condenser 1 will not be practically insufficient.

Moreover, since air of a sufficiently low temperature that has not risen in temperature by passing through the condenser 1 is fed to the central portion of the core portion 14 which constitutes the radiator 2 through the bypass portion 15, the center portion of the core portion 14 is fed. The heat dissipation performance of the cooling water in the part is improved, and the performance of the radiator 2 is improved as a whole.

That is, in the case of the conventional heat dissipation device, the temperature-increased air is sent through the core portion of the condenser 1 to the center portion of the core portion 14 constituting the radiator 2, and the flow velocity at this center portion is as described above. Since it is extremely slow, the temperature of the air that has passed through the condenser 1 and is then sent to the core portion 14 of the radiator 2 must be considerably high.

As a result, in the case of the conventional heat dissipation device, the core portion of the radiator 2
Although the heat dissipation performance in the central portion of 14 was extremely poor, in the case of the heat dissipation device of the present invention, the heat dissipation performance in this central portion is remarkably improved, so that the heat dissipation performance of the radiator 2 as a whole is also improved.

Next, FIG. 3 shows a second embodiment of the present invention.

In the first embodiment described above, a so-called multi-capacitor in which a core portion 9 including a large number of heat transfer tubes 7 and 7 and fins 8 and 8 is provided between the inlet tank 5 and the outlet tank 6 as the condenser 1. In contrast to the flow type, in the case of the present embodiment, the flat heat transfer tube 16 is meandered in the condenser to form straight line portions 17 and 17 which are parallel to each other, and adjacent straight line portions are formed. The fins 18 and 18 are sandwiched and fixed between the 17 and 17.

In the case of the condenser having such a structure, the high-temperature and high-pressure refrigerant vapor sent from one end of the heat transfer tube 16 is condensed and liquefied while flowing through the heat transfer tube 16, and sent out from the other end.

Straight part of one heat transfer tube 16 that constitutes such a condenser
The pitch of 17 and 17 is fine at the parts near both ends and coarse at the center. Then, the fins 18, 18 are not provided in the central portion, and the bypass portion 19 through which the cooling air passes as it is.

Such a capacitor is combined with a radiator and a fan to form a heat dissipation device for an automobile of the present invention. However, by making the outer dimensions of the capacitor and the radiator equal to each other,
Other components are the same as those in the first embodiment described above.

In the case of the first embodiment and the second embodiment, the upper and lower end portions of the bypass portions 15 and 19 (the vertical direction depends on the drawing) are provided in the portion facing the outer peripheral portion of the fan 3. It is also possible to provide a blocking plate so that the cooling air does not pass through the upper and lower ends of the bypass parts 15 and 19.

Further, as in the third embodiment shown in FIG.
By bypassing a part of a large number of heat transfer tubes 7 forming the core portion 9 into a crank shape, the bypass portion 15 can be provided only in the central portion of the core portion 9 in the vertical and horizontal directions.

(Effect of the Invention) Since the heat dissipation device for an automobile of the present invention is configured and operates as described above, it is possible to send a sufficient amount of cooling air to both the condenser and the radiator which constitute the heat dissipation device. Therefore, the performance of the heat dissipation device can be improved.

Therefore, in the case of obtaining the same heat dissipation performance as the conventional one, it is possible to reduce the size and weight of the heat dissipation device, and it is possible to improve the fuel consumption rate and power performance by downsizing and weight reduction of the automobile.

[Brief description of drawings]

1 and 2 show a first embodiment of the present invention, FIG. 1 is a perspective view schematically showing the entire structure, FIG. 2 is a cross-sectional view of a central portion of FIG. 1, and FIG. FIG. 4 is a front view of a capacitor showing a second embodiment of the invention, FIG. 4 is a front view of a capacitor showing the third embodiment, FIG. 5 is a schematic front view showing a conventional heat dissipation device, and FIG. It is a schematic longitudinal side view. 1: Condenser, 2: Radiator, 3: Fan, 4: Bypass passage, 5: Inlet tank, 6: Outlet tank, 7: Heat transfer tube, 8: Fin, 9: Core part, 10: Inlet tank, 11 : Outlet side tank,
12: Heat transfer tube, 13: Fin, 14: Core part, 15: Bypass part, 1
6: Heat transfer tube, 17: Straight part, 18: Fin, 19: Bypass part.

Claims (1)

[Scope of utility model registration request] 1. A condenser having a core portion constituted by heat transfer tubes and fins of a refrigerator constituting an air conditioner for an automobile, and a condenser arranged on the leeward side of the condenser for radiating cooling water for an automobile engine. In a radiator for an automobile, which comprises a radiator having a core portion of a similar structure, and a propeller-type fan that is provided further downwind of this radiator and blows air to the radiator and the condenser,
The external dimensions of the condenser and the radiator are approximately the same, and a bypass section that allows air to pass through without providing heat transfer tubes or fins in a part of the core section of the condenser that matches the center of the fan. A heat radiating device for an automobile, characterized in that the heat radiating device is provided in a state where it does not hinder the circulation of the refrigerant in the heat transfer tubes around it.