JPH0263151B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a refrigerator-freezer, and particularly to a structure for reducing noise from a compressor.

Conventionally, as shown in Figs. 1 and 2, a compressor cover 3 was installed on the back of a compressor 2 placed in a machine room 1, as was implemented in the 1988 series refrigerator-freezer. Sound absorbing material 4 was glued to the board.

Therefore, in the conventional refrigerator, the sound emitted from the sound source of the compressor 2 toward the rear side of the refrigerator is somewhat absorbed by the sound absorbing material 4, but the sound is reflected forward by the compressor cover 3. Further, the porous sound absorbing material that is often used as the sound absorbing material 4 has a great sound absorbing effect for sounds in a high frequency range, but the effect becomes smaller as the frequency becomes lower. In addition, in order for the sound absorbing material 4 to obtain a sound absorbing effect in the medium and low frequency range,
It is possible to increase the thickness of the sound absorbing material 4, but this is difficult when considering cost and spaceability.

For the above reasons, the user standing in front of the refrigerator feels uncomfortable.

The present invention has been made in order to eliminate the above-mentioned drawbacks of the conventional ones, and has a structure in which a compressor cover of a refrigerator-freezer has a slit part and a sound-absorbing material is provided across the slit part, thereby reducing the thickness of the sound-absorbing material. Even in the medium and low frequency range without increasing,
The objective is to provide a refrigerator-freezer that can obtain sound absorption effects similar to those in the high frequency range.

An embodiment of the present invention will be described below with reference to FIGS. 3 to 5.

In FIGS. 3 and 4, a slit portion 3a is provided on the entire surface of a compressor cover 3, which is located on the back of the compressor 2 placed in the machine room and is installed for the purpose of protecting the machine room and for appearance. The sound absorbing material 4 is bonded to the slit portion 3a. That is, in the slit portion 3a, a sandwich structure is formed in which an air layer 6 is sandwiched between the sound absorbing material 4 and the back wall 5.

In the above configuration, by forming an air layer 6 between the sound absorbing material 4 and the back wall 5, as shown in FIG. Similar sound absorption effects can be obtained in the frequency domain. Furthermore, Fig. 5 is a characteristic diagram showing the relationship between frequency and sound absorption coefficient, where the vertical axis shows the sound absorption coefficient α=1-Ir/Ii, the horizontal axis shows the frequency, and the solid line shows the case where there is no air layer 6. , the broken line indicates the case where the air layer 6 is provided as in this embodiment. Here, Ii is the intensity of the sound incident on the material, and Ir is the intensity of the sound reflected from it.

Further, since the sound reflected by the back wall 5 passes through the sound absorbing material 4 again, twice the sound absorbing effect can be obtained. Furthermore, under installation conditions where there is no wall 5 on the back, the sound escapes to the back through the slit portion 3a, is reflected by the compressor cover 3, and the sound does not come out over the entire surface, causing discomfort to the user. This has the practical effect of not giving Furthermore, by providing the slit portion 3a in the compressor cover 3, the heat dissipation characteristics are also improved.

Next, an embodiment of another invention related to a structure capable of reducing the sound of a compressor in a refrigerator-freezer that can be installed with the back of the refrigerator in close contact with a wall is shown in FIGS. 6 and 7.
This will be explained with figures.

FIG. 6 is a partially detailed sectional view showing an embodiment of the present invention. In the figure, a slit portion 3a is formed in the compressor cover 3, located on the back side of the compressor 2 placed in the machine room 1. A sound absorbing material 4 is bonded to the rib 3b protruding from the compressor cover 3 facing the slit portion 3a, and a sandwich structure is formed with an air layer 6 interposed between the compressor cover 3 and the sound absorbing material 4. are doing.

In the above configuration, the sound absorbing material 4 and the compressor cover 3
By interposing the air layer 6 between the two, it is possible to obtain a great sound absorption effect in the middle and low frequency ranges as well as in the high frequency range, as shown in FIG.
In addition, FIG. 7 is a characteristic diagram showing the relationship between frequency and sound absorption coefficient similarly to the above-mentioned FIG. This is the case if you have.

In this embodiment, an air layer 6 is formed between the sound absorbing material 4 and the compressor cover 3, and even if the wall 5 is placed in close contact with the back of the refrigerator, the same great sound absorbing effect as described above can be obtained. Furthermore, as the sound reflected by the back wall 5 passes through the sound absorbing material 4 again, twice the sound absorbing effect can be obtained, as described above. Furthermore, if there is no wall on the back side, the sound will pass through the slit portion 3a to the back side, and it goes without saying that the user who is on the entire surface will not feel uncomfortable.

As described above, according to the present invention, even if the refrigerator is placed closely against the wall, a great sound absorption effect can be obtained by the simple sandwich structure that reduces the sound of the compressor, and as a result, it is possible to obtain a great sound absorption effect for the user who is in front of the refrigerator. It has the great practical effect of not giving pleasure.

[Brief explanation of drawings]

FIG. 1 is a vertical sectional view of a refrigerator-freezer, FIG. 2 is a partially detailed longitudinal sectional view of a conventional refrigerator, FIG. 3 is a rear view of a refrigerator-freezer according to an embodiment of the present invention, and FIG. 4 is an embodiment of the present invention. FIG. 5 is a characteristic diagram showing the relationship between frequency and sound absorption coefficient according to one embodiment of the present invention, and FIGS. 6 and 7 are diagrams showing another embodiment of the present invention. 4 and 5. FIG. DESCRIPTION OF SYMBOLS 1... Machine room, 2... Compressor, 3... Compressor cover, 3a... Slit part, 3b... Rib, 4...
...Sound absorbing material, 5...Back wall, 6...Air layer. In addition,
In the drawings, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] 1. In a refrigerator-freezer having a compressor cover and a sound absorbing material on the back of a compressor placed in a lowermost machine room, a slit portion is formed in the compressor cover, and the slit portion is covered. A refrigerator-freezer characterized in that the sound absorbing material is adhered to the compressor cover. 2. A refrigerator-freezer that is equipped with a compressor cover having a slit on the back of the compressor placed in the lowest machine room and a sound absorbing material, and that can be installed closely against a wall, with an air layer in the compressor cover. A refrigerator-freezer characterized in that the sound absorbing material is mounted so as to face the slit portion through the slit portion. 3. Claim 2, characterized in that a projection integral with the compressor cover is provided between each slit of the slit portion, and the sound absorbing material is adhered to the projection.
Freezer/refrigerator as described in section.