JP2004300960A - Heat exchanger for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger for vehicles for preventing a condenser from becoming hot by an oil cooler and further for readily enhancing cooling capacity in the condenser. <P>SOLUTION: Since a duct 10L at the side of the oil cooler 9 is closed, a duct 10R at the side of the condenser 7 is open while an air conditioner is in use, and both left and right fans 5R, 5L are rotated, a strong air flow 6R by the two fans 5R, 5L is concentrated at the condenser 7 in use, thus readily enhancing cooling capacity in the condenser 7 and further improving the effectiveness of the air conditioner. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a heat exchanger for a vehicle in which a condenser with an integrated oil cooler is arranged in front of a radiator.
[0002]
[Prior art]
A radiator for circulating and cooling engine cooling water is installed in front of an engine room of a vehicle. Further, a condenser for cooling and condensing the air conditioner refrigerant is provided in front of the condenser in a close state.
[0003]
A pair of left and right ducts are formed in front of the condenser, and the ducts lengthen the flow path of the airflow introduced from the front of the vehicle, thereby stabilizing the airflow.
[0004]
Further, a fan shroud is mounted on the rear surface of the radiator, and a pair of left and right openings provided in the fan shroud are respectively mounted with electrically conductive fans. The fan forcibly guides the air to the radiator when the vehicle stops, for example, where a vehicle speed wind (ram pressure) cannot be expected, thereby improving the heat radiation performance.
[0005]
In this way, by passing the air flow introduced from the duct through the condenser or the radiator, the refrigerant or the cooling water circulating in the condenser or the radiator can be cooled by heat radiation.
[0006]
An oil cooler for cooling the AT oil by utilizing the above-described air flow is provided in front of the condenser. The oil cooler has a structure in which the heat radiating pipe is bent slightly to prevent airflow resistance.However, the oil cooler is installed in front of the condenser in order to cool it using the airflow introduced from the front of the vehicle and before reaching the condenser. (For example, see Patent Document 1).
[0007]
[Patent Document 1]
JP-A-11-158917
[Problems to be solved by the invention]
However, in such a conventional structure, since the oil cooler is installed in front of the condenser, when the condenser is not used, the condenser is heated by the hot air flow passing through the oil cooler and becomes hot. When using the air conditioner again, it takes time for the temperature to drop to the appropriate heat exchange temperature, and the effectiveness of the air conditioner may be delayed.
[0009]
In other words, when a large engine driving force is required, such as when traveling uphill, the air conditioner compressor clutch may be forcibly disengaged even in the summer to reduce the engine load even slightly. Although the refrigerant does not circulate through the condenser, the air flow continues to flow due to the radiator and oil cooler, so where the oil cooler is installed, the air flow is heated in the oil cooler part, and the condenser Will get hot. For this reason, even if the uphill traveling is completed, the vehicle returns to the normal traveling, and then the clutch of the compressor of the air conditioner is connected again, the effect of the air conditioner is delayed because the condenser is heated.
[0010]
The present invention has been made by paying attention to such conventional technology, and provides a heat exchanger for a vehicle in which a condenser is not heated by an oil cooler and a cooling capacity of the condenser can be increased at an early stage. It is.
[0011]
[Means for Solving the Problems]
According to the invention of claim 1, a condenser in which an oil cooler is integrated via a partition portion on one side on the left and right sides is disposed in front of the radiator, and a pair of left and right fans is installed behind the radiator. A pair of left and right ducts are installed in front of the integrated condenser, and the air flow introduced from the front of the vehicle by a fan through the duct allows cooling of the condenser and oil cooler and the radiator located behind it for vehicle heat exchange. Wherein the end of the condenser on the side of the partition portion is located in the airflow introduced from the duct on the oil cooler side, and a shutter that can be opened and closed on at least the oil cooler side of the pair of left and right ducts is provided, When the air conditioner is stopped, at least the shutter provided on the duct on the oil cooler side is opened. While the oil cooler side and condenser side of the duct closes the duct to open by Potter, characterized in that it can both left and right fan in rotation.
[0012]
According to the invention of claim 2, a shutter that can be opened and closed is also provided on the duct on the condenser side, and during the warm-up operation, both the ducts are closed by the respective shutters, and both fans are brought into the rotation stopped state. It is characterized by being able to.
[0013]
【The invention's effect】
According to the first aspect of the present invention, since the oil cooler is integrated with the condenser, the airflow passing through the oil cooler does not hit the condenser. However, due to the integration, the heat of the oil cooler may be transmitted to the capacitor side by heat conduction through the partition, so that the end of the capacitor on the side of the partition is connected to the duct on the oil cooler side. The fan is positioned in the airflow introduced from the front of the vehicle.
[0014]
Further, at the time of stopping the air conditioner, at least the shutter provided in the duct on the oil cooler side is in an open state, so that when the air conditioner is stopped, the portion of the condenser closest to the oil cooler can be continuously cooled by the air flow, The heat of the oil cooler can be most effectively prevented from being transmitted to the condenser side (cooling after entering the air flow on the condenser side is slow and ineffective). Therefore, the condenser in the air conditioner stopped state can be maintained in a cooled state for the time of being used again, and when the clutch of the compressor of the air conditioner is connected again, the effect of the air conditioner is quickened.
[0015]
Then, when the air conditioner is in use, this time, the duct on the oil cooler side is closed, the duct on the condenser side is opened, and both the left and right fans are rotated, so the strong air flow by the two fans, Concentrating on the condenser in use, the condenser's cooling efficiency is increased early, and the effectiveness of the air conditioner is further improved.
[0016]
According to the second aspect of the present invention, since both ducts are closed and both fans are stopped, the radiator is not cooled by the airflow, and the warm-up of the engine is accelerated.
[0017]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described below with reference to FIGS. Each figure is a cross-sectional view as viewed from above, and the left side of each figure is the front of the vehicle.
[0018]
A front end panel 1 which is a resin-integrated molded product is assembled in front of the engine room, and a radiator 2 for circulating and cooling engine cooling water is installed in a through portion formed in the center of the front end panel 1. ing.
[0019]
On the rear surface of the radiator 2, a fan shroud 3 fixed to the front end panel 1 is provided. In the fan shroud 3, cylindrical openings 4R and 4L having substantially the same opening diameter are formed on the left and right, and electric fans 5R and 5L supported by stays (not shown) are provided in the openings 4R and 4L, respectively. Have been.
[0020]
A pair of left and right ducts 10R and 10L fixed to the front end panel 1 are installed in front of the radiator 2. The ducts 10R and 10L are set at positions on the vehicle front side corresponding to the openings 4R and 4L, and the opening 4R is located behind the duct 10 and the opening 4L is located behind the duct 10L. So that they are aligned in the front-rear direction. At the entrances of the ducts 10R and 10L, shutters 11R and 11L that can be opened and closed, respectively, are provided. When the vehicle is running, air is introduced from the ducts 10R and 10L by the action of the running wind (ram pressure), and becomes air flows 6R and 6L as it is, passes through the radiator 2, and the openings 4R and 4L of the fan shroud 3. It is sent to an engine (not shown) further behind. Both shutters 11R and 11L can be opened and closed at the same time, or each can be opened and closed separately. The ducts 10R and 10L cover the front of the front end panel 1, and the introduction of the airflow to the radiator 2 and a heat exchanger such as a condenser 7 described later is basically performed only from the inlets of the ducts 10R and 10L. To do it.
[0021]
Since the openings 4R and 4L are also provided with fans 5R and 5L, the radiator 2 and the fan shroud 3 can be rotated by rotating the fans 5R and 5L even when the vehicle is stopped (when idling). The space between the fan 5R and 5L can be made negative pressure, and the air can be forcibly sucked to generate the air flows 6R and 6L corresponding to the fans 5R and 5L. If the fans 5R and 5L are rotated while the vehicle is running, the action of the running wind (ram pressure) is added, so that stronger air flows 6R and 6L can be obtained. In addition, these fans 5R and 5L can be controlled to rotate both or only one of them. As described above, in the arrangement of the ducts 10R and 10L, the openings 4R and 4L, and the fans 5R and 5L arranged in front and rear, the air flow that has entered straight from the inlet of the duct 10R basically when the shutters 11R and 11L are open. 6R flows through the opening 4R as it is. The air flow 6L that has entered straight from the inlet of the duct 10L also flows to the opening 4L.
[0022]
A condenser 7 for an air conditioner is provided in front of the radiator 2. An oil cooler 9 is integrated via a partition 8 on the left side of the condenser 7 in the vehicle traveling direction. Since the size of the oil cooler 9 is smaller than that of the condenser 7, the partition 8 is offset to the left (toward the oil cooler 9), not to the left and right centers. Therefore, in the condenser 7, the vicinity of the end 7a (shown by oblique lines in the drawing) on the side of the partition 8 closest to the oil cooler 9 is located in the air flow 6L introduced from the left duct 10L on the oil cooler 9 side. ing. That is, the partition 8 is located in front of the opening of the opening 4L.
[0023]
Normal (see Figure 1):
Next, the operation will be described. Normally, as shown in FIG. 1, the shutters 11R and 11L in both ducts 10R and 10L are opened, and both fans 5R and 5L are also rotated. By doing so, most of the condenser 7 and the right half of the radiator 2 can be cooled by the airflow 6R introduced from the right duct 10R. Further, with the air flow 6L introduced from the left duct 10L, the vicinity of the end 7a of the condenser 7, the oil cooler 9 and the left half of the radiator 2 can be cooled.
[0024]
When the air conditioner is stopped (see FIGS. 1 and 2):
In such a state, even if the clutch of the compressor of the air conditioner is forcibly disengaged and the refrigerant does not circulate through the condenser 7 in order to reduce the engine load, the oil cooler 9 is integrated with the condenser 7. Therefore, unlike the related art, the airflow that has passed through the oil cooler 9 does not hit the condenser 7 and the condenser 7 is not heated.
[0025]
Although the oil cooler 9 is integrated with the condenser 7, the heat of the oil cooler 9 is transmitted to the condenser 7 by heat conduction via the partition 8 as it is. Since the end 7a of the partition 7 on the side of the partition 8 is located in the air flow 6L by the duct 10L on the side of the oil cooler 9, the vicinity of the end 7a closest to the oil cooler 9 in the condenser 7 is 6L, the cooling can be continued, and the heat of the oil cooler 9 can be most effectively prevented from being transmitted to the condenser 7 side. (It is slow and ineffective to cool after entering the air flow 6R on the condenser 7 side.) ). Therefore, the condenser 7 can be maintained in a cooled state when the condenser 7 is not in use, so that the effect of the air conditioner is increased when the clutch of the compressor of the air conditioner is connected again.
[0026]
It is not always necessary to open both ducts 10R and 10L. If there is enough heat exchange capacity on the radiator 2 side (when the temperature of the engine cooling water is low), as shown in FIG. 10R may be closed, and only the duct 10L on the left side (oil cooler 9 side) may be opened. Further, at this time, only the fan 5L on the oil cooler 9 side is rotated (note that both may be rotated).
[0027]
In this way, even when only the left duct 10L is opened, the vicinity of the end 7a on the partition 8 side of the condenser 7 can be cooled, and as in the case where both ducts 10R and 10L are opened, The unused capacitor 7 can be maintained in a cooled state for use again. Further, by closing one of the ducts 10R, air resistance during traveling of the vehicle is reduced, and fuel efficiency can be improved.
[0028]
That is, taking air into both ducts 10R and 10L and passing it through the condenser 7 and the radiator 2 greatly increases the air resistance when the vehicle is running, but since one of them is closed, Air resistance can be reduced. In this way, when only one of the fans 5L needs to be rotated, power consumption can be reduced as compared with the case where both fans 5L are rotated. When the fan 5L is rotated at high speed or normal rotation, the fan 5R stops depending on a layout (not shown) of the engine behind the fans 5L and 5R, and the shutter 11R of the duct 10R in front of the opening 4R. Is closed, since there is no air flowing through the opening 4R side, a part of the airflow 6L discharged from the fan 5L is blown back forward through the opening 4R, and is sucked again by the fan 5L. It is assumed that the air flow circulates and the cooling efficiency is reduced, but if the rotation speed of the right fan 5R is reduced (at a very low speed) below the rotation speed of the fan 5L, the so-called “cooling efficiency” is reduced. The "blow-back (blow-back)" phenomenon can be suppressed.
[0029]
When using an air conditioner (see Figure 3):
Then, when the air conditioner is in a use state, if the heat exchange capacity of the oil cooler 9 has a margin (when the oil temperature is low), the shutter 11L of the left duct 10L is reversed, contrary to the state of FIG. Is closed, the shutter 11R of the right duct 10R is opened, and both the left and right fans 5R and 5L are rotated. Then, since the strong airflow 6R by the two fans 5R and 5L concentrates on the condenser 7 in use, the cooling efficiency of the condenser 7 is quickly increased, and the effectiveness of the air conditioner is further improved. In addition, since the small air flow 6R 'obliquely introduced from the right duct 10R toward the left fan 5L hits the vicinity of the end 7a on the partition 8 side, substantially the entire condenser 7 is formed by the air flow 6R, 6R'. It will be cooled. In the above description, an example in which both the left and right fans 5R and 5L are rotated has been described. However, even in the case where the rotation of the fan 5L is stopped to reduce power consumption, the opening 4L side is moved forward as described above. In order to suppress the so-called "blow-back (blow-back)" phenomenon flowing to the side, the fan 5L can be rotated at a lower speed (at a very low speed) than the rotation speed of the fan 5R. Then, the fans 5L and 5R may be controlled such that the above-described low-speed rotation of the fans 5L and 5R is performed in a situation where there is no running wind and hot air is likely to be trapped, such as during low-speed running or when the vehicle is stopped. .
[0030]
During warm-up operation (see Fig. 4):
When performing the warm-up operation at the time of starting the engine, both ducts 10R and 10L are closed by shutters 11R and 11L, and both fans 5R and 5L are also stopped. By doing so, the radiator 2 is not cooled by the airflow, and the warm-up of the engine is accelerated.
[0031]
In the above embodiment, the fan shroud 3 may be formed integrally with the front end panel 1, and in this case, the heat exchanger such as the radiator 2 is attached to the front end panel 1 from the front. Will be done.
[Brief description of the drawings]
FIG. 1 is a sectional view of a normal state of a vehicle heat exchanger according to an embodiment of the present invention as viewed from above.
FIG. 2 is a sectional view corresponding to FIG. 1, showing an air conditioner stopped state in which only one fan is rotated.
FIG. 3 is a cross-sectional view corresponding to FIG.
FIG. 4 is a sectional view corresponding to FIG. 1 and showing a warm-up operation state of the engine.
[Explanation of symbols]
Reference Signs List 1 Front end panel 2 Radiator 3 Fan shroud 4R, 4L Opening 5R, 5L Fan 6R, 6L Air flow 7 Capacitor 7a End 8 Partition 9 Oil cooler 10R, 10L Duct 11R, 11L Shutter

Claims (2)

In front of the radiator (2), a condenser (7) having an oil cooler (9) integrated via a partition (8) on one side on the left and right sides is arranged.
A pair of left and right fans (5R, 5L) are installed behind the radiator (2), and a pair of right and left ducts (10R, 10L) are installed in front of the condenser (7) integrated with the oil cooler (9).
The air flow (6R, 6L) introduced from the front of the vehicle by the fans (5R, 5L) through the ducts (10R, 10L) causes the condenser (7) and the oil cooler (9) and the radiator (2) ) And a vehicle heat exchanger capable of cooling
The end (7a) of the condenser (7) on the partition (8) side is located in the air flow (6L) introduced from the duct (10L) on the oil cooler (9) side, and a pair of left and right ducts is provided. (10R, 10L) is provided with an openable and closable shutter (11L) at least on the oil cooler (9) side,
When the air conditioner is stopped, at least the shutter (11L) provided in the duct (10L) on the oil cooler (9) side is opened,
When the air conditioner is used, both the left and right fans (5R, 5L) rotate while the shutter (11L) closes the duct (10L) on the oil cooler (9) side and the duct (10R) on the condenser (7) is open. A heat exchanger for a vehicle, wherein the heat exchanger can be in a state. The vehicle heat exchanger according to claim 1, wherein
A shutter (11R) that can be opened and closed is also provided on the duct (10R) on the condenser (7) side, and both ducts (10R, 10L) are closed by the shutters (11R, 11L) during the warm-up operation. A heat exchanger for a vehicle, characterized in that both fans (5R, 5L) can be brought into a rotation stop state.

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