JPS6113705Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a heat exchanger equipped with a fan shroud.

In this type of heat exchanger, the fluidity of the cooling air is poor, so it is difficult to obtain the desired cooling performance.In particular, in automobile radiators, a large amount of cooling air is required due to the ram pressure generated when driving at high speed. Those fed into the heat exchanger core further worsen the situation.

Conventionally, as a measure to deal with such problems,
As shown in Fig. 1, a window hole d or d has a cover c or c' that can be opened and closed and has a structure as shown in Figs. 2 and 3 in the back wall b of the straight body a of the fan shroud FS. When the air resistance increases due to the ram pressure during high-speed running, the lid c or c' opens to reduce the air resistance, thereby increasing the fluidity of the cooling air. There is something, but this doesn't allow enough open area, so
This has not yet been a satisfactory solution to the above problems.

Therefore, the present invention provides a heat exchanger that can solve the above problems by having a structure that allows a sufficient open area.

An embodiment in which this invention is applied to an automobile radiator will now be described with reference to Figs.

In the figure, 1 is a radiator consisting of a large number of water tubes and cooling fins arranged in parallel.
Core, 2 is an atsupa tank connected and fixed to the upper part of this radiator core 1, 3 is a lower tank connected and fixed to the lower part of radiator core 1, 4, 4'
5 are brackets each having a U-shaped cross section and are installed and fixed on both sides of the radiator core 1, and 5 is a fan shroud that is installed on the back side of the radiator core 1.

The fan shroud 5 has a straight skirt body 50 and a cylindrical portion 51 provided at the center of the back wall of the straight skirt body 50, as is well known, but here, these are not integrated. The cylindrical part 51 is divided from the straight skirt body 50, and the straight skirt body 50 is further divided into left and right parts from the center part, resulting in a divided structure composed of the cylindrical part 51 and the divided trunks 52, 52'. .

The cylindrical part 51 is supported by a trivet-shaped support 6 and is installed and fixed on both brackets 4 and 4', and both split cylinders 52 and 52' are L-shaped connections that are installed and fixed between brackets 4 and 4'. It is installed via the piece 7.

The connecting piece 7 is made of a plate spring material (for example, phosphor bronze), and when the pressure inside the fan shroud 5 exceeds a predetermined pressure, it is compressed into a U-shaped cross section by the divided cylinders 52, 52', and , when the pressure within the fan shroud 5 is below a predetermined pressure, the split cylinders 52, 52' can be pressed by the elastic force.

In the figure, 8 is a water supply port, 9 is an inlet pipe, 10 is an outlet pipe, and 53 is formed on the back side of the cylindrical part 51, and has an airflow window hole 54, a motor mounting hole 55, and a bolt hole 56. A fan mounting wall 57 is a motor fan mounted on the fan mounting wall 53 and disposed within the cylindrical portion 51.

According to the automotive radiator of the embodiment configured as described above, the motor fan 57 is now rotating, forced cooling is being performed, and the motor fan 57 is running at a low or medium speed, and the pressure inside the fan shroud 5 is being cooled. When the pressure is below a predetermined pressure that does not impede the fluidity of the air, the cooling air flowing within the fan shroud 5 is led out into the engine room through the airflow window 54 as shown in the phantom diagram.

Then, when the vehicle is running at high speed and the amount of cooling air flowing into the radiator core 1 increases due to ram pressure, and the pressure inside the fan shroud 5 rises above a predetermined pressure, the pressure of this cooling air causes the fan shroud 5 to The divided shells 52, 52' are opened as shown in FIG. 6 while resisting the elastic force of the respective connecting pieces 7, and the cooling air in the fan shroud 5 is discharged from the opening O into the engine room as shown in the imaginary diagram. will be derived.

At this time, the motor fan 57 within the cylindrical portion 51 is stopped, and the cooling air within the fan shroud 5 is also led out from the air flow window hole 54.

Then, when the vehicle enters the low-speed or medium-speed running state again and the pressure inside the fan shroud 5 becomes less than the predetermined pressure, the elastic force of the connecting piece 7 overcomes the pressing force of the divided cylinders 52, 52', so that the divided cylinders 52, 5
2' is closed and returned to the state shown in Figure 5, and the fan
Cooling air within the shroud 5 will be led out only through the airflow window holes 54.

In addition, when the divided cylinders 52, 52' are returned to closed position,
The divided cylinders 52, 52' are restrained by the support 6 and maintain the state shown in FIG.

In summary, the heat exchanger according to this invention has a divided structure in which the fan shroud is divided into left and right parts, and the left and right divided bodies are respectively attached to the heat exchanger core in a double-door shape and pass through the heat exchanger core. When the pressure of the cooling air exceeds a predetermined pressure, the divided body becomes open due to the action of the cooling air pressure, and when the pressure of the cooling air falls below the predetermined pressure, the divided body automatically returns to the closed state. Therefore, as mentioned in the example, Juan
When the pressure inside the shroud increases and the fluidity of the cooling air becomes obstructed, the cooling air inside the fan shroud is guided outside through the large opening formed by opening the dividing body, which allows cooling. There is a practical benefit in that the fluidity of air is no longer inhibited and the desired cooling performance can be maintained.

Note that this invention is not limited to the automobile radiator of the embodiment, but can be applied to other heat exchangers such as condensers, and similar effects can be obtained.

Further, the structure is not limited to that of the embodiment, and various design changes can be made within the scope of the technical idea described in the claims of the utility model registration.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a fan shroud installed in a conventional heat exchanger, FIGS. 2 and 3 are enlarged longitudinal sectional views of the same, and FIG. 4 is a rear view of an embodiment of this invention. FIG. 5 is a cross-sectional view of the same, and FIG. 6 is a cross-sectional view of the divided cylinder in an open state. 1...Radiator core, 5...Juan shroud, 50...Straight skirt torso, 5
2,52'...Divided trunk.

Claims (1)

[Scope of utility model registration request] In a heat exchanger equipped with a fan shroud, the fan shroud is divided into left and right parts, and the left and right divided bodies are respectively attached to the heat exchanger core in a double-door shape and pass through the heat exchanger core. When the pressure of the cooling air exceeds a predetermined pressure, the divided body becomes open due to the action of the air pressure, and when the pressure of the cooling air falls below the predetermined pressure, the divided body automatically returns to the closed state. A heat exchanger characterized by: