JPS5833212Y2 - radiator device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a radiator device used in construction machinery and the like.

This type of radiator device is constructed as shown in Fig. 1, with one side of the radiator core a facing a fan C rotated by an engine bK, and the other side facing a guard e with a space d left between them. be.

The air from the fan C passes through the radiator core a and is discharged to the outside from the guard e, where heat is exchanged as it passes through the radiator core a.

At this time, when the wind passing through the radiator core a exceeds the critical flow velocity, a loud noise suddenly occurs (Figure 2).

This is because a high-pressure sound pressure wave W as shown in the figure is generated in the space d (or its surroundings) shown in FIG. 1, and this resonates with the radiator core 3.

As a result of experimental research in order to eliminate this resonance sound and prevent noise generation when the flow velocity of cooling air exceeds the critical flow velocity, the inventor of the present invention found that the waveform of the sound pressure wave, which is the cause of the resonance sound, can be destroyed. It was discovered that if the shape was changed, the resonance sound would be eliminated and the noise would be reduced.

The present invention has been developed in view of the above, and its configuration will be explained below based on the embodiment shown in FIG.

In the figure, 1 is the engine, 2 is the fan, and 3 is the radiator core.There is a space 4 on the lee side of the cooling air of the radiator core 3.
There is a guard 5 that separates the area from the outside.

And a space 4 between this radiator core 3 and guard 5
A plurality of thin plates 6 whose front and back sides are parallel are fixed in parallel with the flow of the cooling air.

One end of this thin plate 6 is brought into contact with the radiator core 3,
The other end of the curved line is made to coincide with the position of the abdomen (head of the waveform) of the sound pressure wave W shown in FIG.

Further, this thin plate 6 has a size that spans the entire length of the radiator core 3.

Next, an example carried out by the present inventor will be described.

The experimental apparatus is as shown in Fig. 4, with radiator core 3
Two thin plates 6 are fixed vertically on the leeward side of.

In the figure, the width of the radiator core 3 is 1120 mm, the dimension l of the thin plate 6 in the cooling air flow direction is 250 mm, and the noise measurement point A is placed 1 m behind the shroud at 7045 degrees.

When this device is pressed, the fan 2 is rotated by the electric motor 8 to blow air, and in this state, the thin plate 6 is moved excessively in the lateral direction, and its position: Xcrr&, ycrr& is changed to find the position where the radiator resonance noise is reduced. find out.

The air volume is 66-5 m"/"y'n i n,
The noise level is measured using a 1/3 octave noise analyzer.

The results are shown in Table O below.

Click here for this experiment. Measure 1 has an air volume of 720m.
It is not effective above 7m1n, and countermeasure 2 has an air volume of 7m1n or more.
It was effective even at speeds of 50 m''/min or more.

Also, no change was observed in the horsepower consumption of the fan due to the addition of the thin plate 6.

Further, FIG. 5 is a diagram showing the relationship between fan air volume and radiator noise, in which a shows the effect before the phantom measure, b shows the measure 1, and C shows the measure 2.

The present invention is as described above, and on the leeward side of the radiator core 3, a plurality of thin plates 6 with parallel front and back sides are placed parallel to the flow of cooling air, with one end in contact with the radiator core 3, and the other end in contact with the radiator core 3. Since the radiator device is configured by being positioned and fixed at a portion corresponding to the abdomen of the sound pressure wave W generated on the leeward side of the radiator core 3, the shape of the sound pressure wave generated on the leeward side of the radiator core 3 is distorted. This eliminates the generation of resonance noise due to sound pressure waves and reduces the noise caused by the radiator core.

According to the present invention, since the thin plate 6 is literally a thin parallel plate, the provision of the thin plate 6 does not increase flow path resistance and there is no decrease in air volume.

! Furthermore, according to the present invention, the noise caused by the radiator core can be reduced without attaching a sound absorbing material to the thin plate 6.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing the schematic configuration of a conventional general radiator device, Fig. 2 is a diagram showing the relationship between the noise level and the flow rate of cooling air in the conventional device, and Fig. 3 is a plan view of the device of the present invention. FIG. 4 is a plan view showing the schematic configuration of the apparatus used in the experiment, and FIG. 5 is a diagram showing the relationship between the fan air volume and the noise level. 3 is the radiator core, 4 is the space, and 6 is the thin plate.

Claims (1)

[Scope of utility model registration request] 1. On the leeward side of the radiator core 3, a plurality of thin plates 6 with parallel grassy smells are placed in parallel with the flow of cooling air and one end is brought into contact with the radiator core 3.1. A radiator device characterized in that the other end is positioned and fixed at a portion corresponding to the abdomen of a sound pressure wave W generated on the leeward side of a radiator core 3.