JPH10306972A - Refrigerator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the noise caused from a fan device without marring the heat radiation effect of a machine chamber. SOLUTION: A bell-mouth which surrounds the fan 5b of the fan device 5 within a machine chamber 2 is made integrally at a partition plate 6. A Helmholtz resonator 8 is arranged in circular form along the inside periphery of the bell-mouth 7. The tubular part 8b of the Helmholtz resonator 8 opens to the side of the fan 5b. The resonance frequency of the Helmholtz resonator 8 is made to correspond to the peak frequency out of the noise caused at operation of the fan device 5. The Helmholtz resonator 8 can reduce the noise, so as to silence the main noise out of the noise caused from the fan device 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a refrigerator provided with a fan device.

[0002]

Conventionally, equipment such as a compressor is provided in a machine room of a refrigerator, and a fan device for cooling the equipment is provided. In order to reduce noise generated during operation of the fan device, for example, a method of disposing a sound absorbing material such as glass wool in a machine room or sealing the machine room has been adopted.

However, the method of disposing a sound absorbing material among the above-mentioned methods is effective for high frequency noise of 1000 Hz or more, but has a problem that it is ineffective for low frequency noise. . Also, the method of sealing the machine room is
Although effective in reducing noise, it was difficult to radiate heat from equipment such as compressors. Therefore, there are problems that the performance of the refrigerator is deteriorated and the structure for heat dissipation becomes complicated. The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a refrigerator that can reduce noise generated from a fan device without impairing the heat radiation effect of a machine room.

[0004]

According to a first aspect of the present invention, there is provided a refrigerator comprising: a fan device provided inside a refrigerator main body; and a bell mouth formed with a circular bell mouth surrounding the fan of the fan device. It is characterized by comprising a member and a Helmholtz resonator provided near the bell mouth in the bell mouth forming member.

According to the above configuration, the Helmholtz resonator is provided near the fan of the fan device, which is a source of noise,
Since the noise corresponding to the resonance frequency of the Helmholtz resonator is muted, noise generated when the fan device is driven can be reduced. In particular, since Helmholtz resonators can muffle relatively low frequency noise, noise that could not be muffled by sound absorbing materials such as glass wool, which has been conventionally adopted as a noise countermeasure, can be effectively removed. Can mute. In addition, since the Helmholtz resonator is provided on the bellmouth forming member so as to be located near the bellmouth, there is no influence on the air blowing action of the fan.

In this case, a plurality of Helmholtz resonators are
It is preferable that the bell mouth is arranged circularly along the inner circumference (claim 2). According to such a configuration, since the sound is muted by the plurality of Helmholtz resonators arranged so as to surround the fan, the noise generated by the fan device can be further reduced.

[0007] It is desirable that, of the fan units provided in the refrigerator, noise generated during operation of the fan unit for cooling the equipment provided in the machine room be silenced by the Helmholtz resonator. Claim 3).

Further, the resonance frequencies of the plurality of Helmholtz resonators may be set so as to correspond to a plurality of peak frequencies in a frequency distribution of noise generated by the fan device. According to such a configuration, the main noise among the noises generated by the fan device can be silenced by the Helmholtz resonator, so that the noise can be further reduced.

In addition, it is a good configuration to accommodate a frequency adjusting member such as glass wool inside the Helmholtz resonator (claim 5). According to such a configuration, the resonance frequency determined from the shape of the Helmholtz resonator can be lowered by the frequency adjusting member.
Therefore, if the set resonance frequency becomes higher than the peak frequency of the fan device after the Helmholtz resonator is formed, the Helmholtz resonator is appropriately housed in the Helmholtz resonator to accommodate the frequency adjusting material. The resonance frequency of the fan can be matched to the peak frequency of the noise of the fan device. Further, by housing an appropriate frequency adjusting member in the Helmholtz resonator, the resonance frequency can be made different even if the Helmholtz resonator has the same shape.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. First, FIG. 3 shows the machine room 2 formed at the lower rear portion of the refrigerator main body 1 with a cover (not shown) removed. In the machine room 2, a rotary compressor 3 and a refrigerant pipe 4 constituting a refrigeration cycle are arranged as shown in the figure.

The right side of the machine room 2 is partitioned by a partition plate 6. On the right side of the partition plate 6, a fan motor 5a is provided. This fan motor 5
The fan 5b rotated by a comprises, for example, a fan having three blades, and is accommodated in a circular bell mouth 7 formed on the partition plate 6. In this case, the partition plate 6 constitutes a bellmouth forming member. The fan device 5 is composed of the fan motor 5a and the fan 5b. The fan device 5 is configured to be driven according to the operation state of the compressor 3 to blow air to equipment such as the compressor 3 arranged in the machine room 2 to cool the fan.

Here, the configuration around the bellmouth 7 will be described with reference to FIGS. The bell mouth 7 has a short cylindrical shape slightly protruding to the blowing side (left side in FIG. 2) of the fan 5 a and is formed integrally with the partition plate 6. A plurality of, for example, eight Helmholtz resonators 8 are attached to the left side of the partition plate 6 in FIG. In this case, the eight Helmholtz resonators 8 are arranged circularly (in a concentric manner) substantially along the circular inner peripheral surface of the bell mouth 7.

The eight Helmholtz resonators 8 have the following configuration. That is, the annular container 9 having a substantially rectangular cross section is attached to the partition plate 6 so as to close the opening 9a at the right end in FIG. The inside of the annular container 9 is partitioned by eight partition plates 9b, and is divided into eight in the circumferential direction. Each of these eight parts constitutes a volume 8 a of the Helmholtz resonator 8. The inner peripheral wall of the annular container 9 (the peripheral wall on the side facing the bell mouth 7) 9
A circular hole is formed in c, and a relatively short tube portion 8b is connected to the circular hole. This tube part 8b
The Helmholtz resonator 8 is composed of the volume 8a. In this case, the open end of the tube portion 8b of each Helmholtz resonator 8 is located near the fan 5a.

As shown in FIG. 4, the Helmholtz resonator 8 has a volume 8a of V (m ³ ) and a tube 8b.
Is D (m), cross-sectional area is S (m ² ), and length is l
(M), the resonance frequency fn (Hz) is represented by the following equation.

[0015]

(Equation 1) Therefore, the Helmholtz resonator 8 can be configured by appropriately setting the volume of the volume 8a, the length of the tube 8b, and the like.
The resonance frequency can be set to a desired value.

When the distribution of the frequency (Hz) and the sound pressure (db) of the noise generated during the operation of the fan device 5 was examined, a distribution diagram as shown in FIG. 5 was obtained. As shown in FIG. 5, the noise generated during the operation of the fan device 5 has a peak at a frequency around 1 kHz as a whole,
It shows a gentle mountain-shaped frequency distribution in which the sound pressure gradually decreases toward both sides of the high frequency side and the low frequency side, and has a plurality of peak frequencies indicating partially high sound pressure. I have. Then, among the plurality of peak frequencies, particularly, the noise having a frequency of 154 Hz shows a very high sound pressure.

Therefore, in the present embodiment, the Helmholtz resonator 8 is formed so that the two main peak frequencies (154 Hz and 1 KHz) of the above-mentioned peak frequency of the noise of the fan device 5 become the resonance frequencies. That is, 8
The resonance frequency of some Helmholtz resonators 8 among the Helmholtz resonators 8 is set to 154 Hz,
The resonance frequency of the remaining Helmholtz resonator 8 was set to 1 KHz.

According to the present embodiment having such a configuration, the noise corresponding to the resonance frequency of the Helmholtz resonator 8 is silenced by the Helmholtz resonator 8 arranged near the fan 5b which is the source of the noise. can do. Therefore, it is possible to reduce noise generated when the fan device 5 is driven during the operation of the compressor 3. Moreover, since the eight Helmholtz resonators 8 are arranged along the inner periphery of the bell mouth 7, there is no effect on the air blowing action from the fan 5b. Further, since the Helmholtz resonator 8 is configured to surround the fan 5b, which is a noise source, the silencing effect of the Helmholtz resonator 8 is further improved.

In this embodiment, the fan device 5
There are two main peak frequencies in the noise generated during the operation of the Helmholtz resonator 8. The resonance frequencies of some Helmholtz resonators 8 of the eight Helmholtz resonators 8 are matched with one of the peak frequencies, and the remaining Helmholtz resonators are matched. The resonance frequency of the resonator 8 was configured to match the other peak frequency. Therefore, the Helmholtz resonator 8 can effectively mitigate the main peak noise among the noises of the fan device 5, so that the noise can be further reduced.

Further, in the present embodiment, eight Helmholtz resonators 8 are formed by dividing the interior of one annular container 9 into eight pieces. Therefore, the configuration is simpler than when eight Helmholtz resonators are individually formed and mounted on the partition plate 6, and the mounting operation is also facilitated.

FIGS. 6 and 7 show a second embodiment of the present invention, which differs from the first embodiment in the following points. That is, in the second embodiment, instead of forming the Helmholtz resonator 8 with the annular container 9 separate from the partition plate 6, an annular concave portion 11 corresponding to the annular container 9 is formed in the partition plate 6. Then, the Helmholtz resonator 8 is configured by closing the annular concave portion 11 with the cover 12.

Specifically, the partition plate 6 has an annular recess 11
Are integrally formed so as to surround the bell mouth 7. The inside of the annular concave portion 11 is partitioned by eight partition plate portions 11a, and is divided into eight in the circumferential direction. Each of these eight parts constitutes a volume 8 a of the Helmholtz resonator 8. A long hole is formed in the inner peripheral wall (peripheral wall facing the bell mouth 7) 11b of the annular concave portion 11, and a relatively short semicircular tubular projecting wall connected to the long hole. A part 13 is formed. Then, an annular cover 12 is attached to the partition plate 6 so as to cover the opening of the annular recess 11 and the opening of the projecting wall 13. Thus, a Helmholtz resonator 8 is configured.

In the present embodiment, two or more of the peak frequencies of the noise of the fan
The volume of the volume portion 8a of each Helmholtz resonator 8 and the length dimension and cross-sectional area dimension of the protruding wall portion 13 were set so as to be any one of the peak frequencies (154 Hz, 1 KHz).

The configuration of the second embodiment other than the above is the same as the configuration of the first embodiment. Therefore, also in the second embodiment, the same operation and effect as in the first embodiment can be obtained. Further, in the present embodiment, the main parts of the Helmholtz resonator 8 (that is, the annular concave part 11 and the protruding wall part 13) are formed integrally with the partition plate 6, so that the number of parts can be reduced. Moreover, since the annular concave portion 11 and the protruding wall portion 13 can be formed integrally with the partition plate 6 by using a simple upper and lower mold, the effect of simplifying the manufacturing and assembling is also obtained.

FIG. 8 shows a third embodiment of the present invention. Differences from the first embodiment will be described.
The same parts as those of the first embodiment are denoted by the same reference numerals. In the third embodiment, a frequency adjusting member 15 such as glass wool is housed inside the Helmholtz resonator 8. In this case, the frequency adjusting member 15 is attached so as to be located at a portion of the volume 8a that communicates with the pipe 8b.

When such a frequency adjusting member 15 is accommodated in the Helmholtz resonator 8, the resistance to the fluid flowing from the tube 8b increases, and the resonance frequency of the Helmholtz resonator 8 can be lowered. Therefore, after the Helmholtz resonator 8 is formed, if the resonance frequency set by the shape thereof becomes higher than the peak frequency of the noise of the fan device 5, the frequency adjusting material 15 is accommodated in the volume 8a. By doing so, the resonance frequency of the Helmholtz resonator 8 can be matched with the peak frequency of noise.

The Helmholtz resonator 8 can have the same shape, and the resonance frequency of the Helmholtz resonator 8 can be varied by varying the amount of the frequency adjusting member 15 housed therein. In addition, as a frequency adjustment member,
Not only glass wool but also other cotton-like members, porous sound absorbing materials, and the like can be used.

The present invention is not limited to the embodiment described above and shown in the drawings, but can be extended or modified as follows. Although the configuration is such that the noise of the fan device 5 disposed in the machine room 2 is reduced, the present invention is not limited to this, and the noise of the fan device for supplying the cool air generated by the cooler to the refrigerator compartment or the freezer compartment is reduced. It is good also as a structure which performs.

Instead of providing a plurality of Helmholtz resonators 8, one Helmholtz resonator may be provided.

The resonance frequency of the Helmholtz resonator 8 is set to 154 Hz and 1 KHz which are two main types of the peak frequency of the noise of the fan device. May be provided.

[0031]

As is apparent from the above description, the present invention provides a bellmouth forming member having a circular bellmouth surrounding a fan of a fan device provided inside a refrigerator main body, the bellmouth forming member being provided near the bellmouth. Since the Helmholtz resonator is provided so as to be located at the position, noise generated when the fan device is driven can be reduced. In particular, when the resonance frequency of the Helmholtz resonator is set to correspond to a plurality of peak frequencies in the frequency distribution of the noise generated by the fan device, the main noise of the noise generated by the fan device is set to the Helmholtz resonance. Since the sound can be muted by the container, the noise can be further reduced.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of the present invention, and is a perspective view around a fan device and a Helmholtz resonator.

FIG. 2 is a vertical side view of the vicinity of a fan device and a Helmholtz resonator.

FIG. 3 is a perspective view of a machine room of the refrigerator.

FIG. 4 is a schematic diagram illustrating the sound absorption principle of a Helmholtz resonator.

FIG. 5 is a distribution diagram of noise frequency and sound pressure generated by the fan device.

FIG. 6 is a partially exploded sectional view of a Helmholtz resonator according to a second embodiment of the present invention.

FIG. 7 is a partial view of the Helmholtz resonator viewed from a fan side.

FIG. 8 is a longitudinal sectional front view showing a third embodiment of the present invention.

[Explanation of symbols]

1 is a refrigerator body, 2 is a machine room, 3 is a compressor, 5 is a fan device, 5b is a fan, 6 is a partition plate (bellmouth forming member), 7 is a bellmouth, and 8 is a Helmholtz resonator.

Claims (5)

[Claims] 1. A fan device provided inside a refrigerator main body, a bell mouth forming member provided with a circular bell mouth surrounding a fan of the fan device, and a vicinity of the bell mouth in the bell mouth forming member. And a Helmholtz resonator provided in the refrigerator. 2. The refrigerator according to claim 1, wherein a plurality of Helmholtz resonators are provided, and the plurality of Helmholtz resonators are circularly arranged along the inner circumference of the bell mouth. 3. The refrigerator according to claim 1, wherein the fan device is for cooling equipment provided in the machine room. 4. The apparatus according to claim 2, wherein the resonance frequencies of the plurality of Helmholtz resonators are set to correspond to a plurality of peak frequencies in a frequency distribution of noise generated by the fan device. refrigerator. 5. The refrigerator according to claim 1, wherein a frequency adjusting member such as glass wool is housed inside the Helmholtz resonator.