JPH05332666A - refrigerator - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain a refrigerator having a structure capable of obtaining good soundproofing. [Structure] In a sound source chamber (30) in which a compressor (4) and a blower fan (5) are arranged, an intake duct (19) and a discharge duct in which at least a part of a soundproof material (23) is mounted are arranged. The noise in the sound source room (30) is repeatedly absorbed and reflected in the intake duct (19) and the exhaust duct to be reduced. In addition, the duct outlet is enlarged to improve ventilation and improve heat dissipation. In addition, the building floor surface is used as part of the intake duct. The soundproof material (23) is made of a porous structure. In addition, a defrosting water evaporation dish is attached so as to cover the opening on the bottom of the refrigerator. [Effect] With a soundproof structure with a small amount of soundproof material,
The noise transmission openings are reduced to reduce the operating environment.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator having a machine room provided with a compressor, a blower fan and the like forming a part of a refrigeration cycle.

[0002]

2. Description of the Related Art FIG. 35 and FIG.
It is a figure which shows the conventional refrigerator shown by 16286 gazette. In the figure, (1) is the machine room of the refrigerator, and (2) is the machine room.
Side plate of (1), (3) top plate of machine room (1), (4) compressor installed in machine room (1), (5) blows air in machine room (1) Blower fan, (6) is a condenser installed in the machine room (1), (7)
Is a front outlet of the machine room (1), (8) is a partition that divides the machine room (1) into an intake side and an intake side, (9) is a soundproof material attached to the partition, and (10) is a compressor. A soundproof plate provided between (4) and the condenser (6), (11) a soundproof material attached to the soundproof plate (10), and (1
2) is a soundproofing material attached to the side plate (2), (13) is a backside soundproofing board that covers the backside of the machine room (1), and (14) is a soundproofing material attached to the top plate (3).

The conventional refrigerator is constructed as described above, and the compressor (4) and the blower fan (5) are installed on the side plate (2), the top plate (3), the partition (8) and the rear soundproof plate (13). It is surrounded and placed. Then, part of the noise generated from the compressor (4) and the blower fan (5) is absorbed by the soundproofing materials (9), (11), (12) and (14). In addition, the machine room (1) which is the opening, the front discharge port (7) and the soundproof plate (1
The structure is such that only the noise of the compressor (4) and the blower fan (5) that pass through the ventilation passage between the soundproof material (0) and the soundproof material (9), (12), (14) is transmitted to the outside air. ..

37 and 38 also show a conventional refrigerator, for example, the one disclosed in Japanese Patent Laid-Open No. 3-170772. In the figure, (33) forms a refrigerator compartment (38) and a door (34)
Inner box provided with, (55) is under the inner box (33), that is,
The bottom plate that forms the lower part of the refrigerator, part of which rises to the machine room
It constitutes the side surface (56) and ceiling (57) of (1). (44) is a base plate that forms the lower part of the machine room (1) and the rear wheel casters (36) are fixed, (58) is an outer plate that forms the end surface of the machine room (1), and (4) is a base plate ( A compressor installed in (44), (24) a defrosting water evaporating plate installed adjacent to the base plate (44), (2) a front plate of the machine room (1), (59)
Is a compressor cover which is provided with an exhaust port (60) and forms the other side surface of the machine room (1), (61) is an opening formed in the lower surface of the refrigerator, and (62) is a front wheel caster.

The conventional refrigerators shown in FIGS. 37 and 38 are constructed as described above, and suck outside air from an opening (61) formed on the lower surface of the refrigerator by a blower fan (not shown).
Cools the machine room (1) and evaporates defrost water. Then, the structure is such that the air is exhausted from the exhaust port (60) of the compressor cover (59).

[0006]

In the conventional refrigerator shown in FIGS. 35 and 36 as described above, the front opening area on the condenser (6) side of the machine room (1) is large and the end face of the soundproof plate (10) is large. Larger than the cross-sectional area of the ventilation passage. For this reason, the noise emitted from the ventilation path on the end surface of the soundproof plate (10) to the condenser (6) side is directly transmitted to the outside air. Noise emitted from the compressor (4) and the blower fan (5), which are noise sources in the machine room (1), to the outside air is
4), the soundproof plate (10), the back soundproof plate (13), the surface area of the sound source room composed of the partition (8), and the machine room (1) front surface and machine room (1) front discharge port ( 7) and soundproofing board (10)
Determined by the sum of the cross-sectional areas of the end face ventilation passages. Therefore, there is a problem that a good soundproofing effect cannot be obtained even if a large amount of soundproofing material is used.

Further, in the conventional refrigerator of FIGS. 37 and 38 as described above, the opening (61) formed on the lower surface of the refrigerator.
Therefore, the noise of the compressor (4) and the blower fan (not shown) in the machine room (1) is transmitted to the outside as it is, resulting in a large operation noise.

The present invention has been made in order to solve the above problems, and an object thereof is to obtain a refrigerator having a structure capable of obtaining a good soundproofing action with a small amount of soundproofing material. Moreover, it aims at obtaining the refrigerator of the structure which reduces a driving noise.

[0009]

In a refrigerator according to the present invention, a compressor forming a part of a refrigeration cycle, a blower fan for sending air to the compressor, and a defrost water evaporation tray are provided in a machine room. A sound source chamber, which is provided in the rear part and is formed by a partition plate, in which a compressor and a blower fan as a sound source are arranged, an air intake duct that communicates with the sound source chamber at one end and the outside air at the other end, and both sides at the rear of the machine room. There is provided an exhaust duct, which is extended upward and has one end communicating with the sound source chamber and the other end communicating with the outside air, and a soundproofing material disposed at least in a part of an air passage system formed by the intake duct and the exhaust duct.

Further, there is provided an exhaust duct whose opening area on the outside air side is larger than that on the sound source chamber side.

Further, there are provided an intake duct whose opening area on the sound source chamber side is wider than the opening area on the outside air side, and an exhaust duct whose opening area on the outside air side is wider than that on the sound source chamber side. Be done.

Further, a sound source chamber, which is formed on the upper side of the other side of the base plate having a groove-shaped recess on the lower side of one side, in which a compressor and a blower fan serving as a sound source are arranged, and a groove shape of the base plate A defrosting water evaporating dish provided adjacent to the recess and an intake duct formed in the groove-like recess of the base plate and having one end communicating with the sound source chamber and the other end communicating with the outside air are provided.

Further, an exhaust duct is provided horizontally in the rear part of the machine room, the middle part of the back plate of the machine room communicating with the sound source chamber, and the part of the machine room side plate communicating with the outside air at the machine room rear plate surface.

Further, it is provided in at least a part of the air passage system formed by the intake duct and the exhaust duct, and the specific gravity is continuously changed in at least one of the thickness direction of the layer and the plane direction of the layer. A soundproof material made of a porous structure having layers is provided.

Further, a bottom plate which is provided at the lower part of the refrigerator and partially rises to form a side surface and a ceiling on the other side of the machine room having an opening on one side, and a bottom plate which forms the lower part of the machine room and are adjacent to the side surfaces, respectively. It connects to the machine room by the base plate where the compressor for the refrigerator and the blower fan are installed in the position where it is installed, and the recess which is attached to the bottom side of the machine room on the side opposite the machine room and which opens to the side of the machine room of the bottom plate. A defrost water evaporation tray is provided to cover the lower surface of the refrigerator with a base plate. In addition, a sound absorbing material mounted on the lower surface of the bottom plate facing the defrost water evaporation dish is provided.

[0016]

The sound absorbing material of the air passage system repeats absorption and reflection in the intake duct and the exhaust duct until the noise of the compressor and the blower fan is transmitted to the outside air from the sound source chamber of the refrigerator constructed as described above. .. Further, noise that has penetrated into the intake duct and the exhaust duct through the wall that divides the sound source chamber is also repeatedly absorbed and reflected by the soundproof material of the air passage system.

Further, the pressure loss of the air flow on the sound source room side of the intake duct and the outside air side of the exhaust duct is reduced, and ventilation in the machine room is smoothed.

Further, the opening formed on the lower surface of the refrigerator is closed by the defrosting water evaporating dish, and the air flow from the blower fan is generated by the blower fan in the machine chamber and the defrosting water evaporating dish due to the recessed portion of the bottom plate which is open to the side of the machine chamber. Circulate between.

[0019]

【Example】

Example 1. 1 to 5 are views showing an embodiment of the present invention. In the figure, (1) is the machine room of the refrigerator, (2) is the side plate of the machine room (1), (3) is the top plate of the machine room (1), and (4) is the machine room (1).
The compressor provided in the above, (5) is a blower fan for blowing the air in the machine room (1), and (13) is a back plate for closing the back surface of the machine room (1). (15) is a front plate of the machine room (1), (16) is a rear plate of the machine room (1), and (17) is installed in the machine room (1) and is provided with a compressor (4) and a blower fan (5). (18) is a partition plate placed in front of the machine room, (18) is an anti-vibration rubber supporting the compressor (4) and the blower fan (5) on the floor of the machine room (1),
9) is an intake duct formed by a top plate (3), an intake duct side plate (20) and a bottom plate (21), (22) is an intake port, and (23) is a bottom plate (21).
Sound absorbing soundproof material attached to, (24) defrost water evaporation dish,
(25) are openings provided on both sides of the top plate (3) toward the rear, (26) is an exhaust duct formed by the partition plate (27), the side plate (2) and the back plate (13), ( 28) is the exhaust port of the exhaust duct (26) opened on the upper surface of the machine room (1), (29) is the intake duct
Sound-absorbing soundproof material attached inside (19), side plate (30)
The sound source chamber formed by (2), the partition plate (17), the top plate (3) and the bottom plate (21), and (31) is the opening of the intake duct (19).

(32) is a heat insulating material, (33) is an inner box surrounded by the heat insulating material (32), (34) is a door of the inner box (33), and (35) is a lower surface of the machine room (1). Installed adjuster, (36) is a caster mounted on the lower surface of the machine room (1), (37) is a gasket provided between the inner box (33) and the door (34), and (38) is an inner box. It is a refrigerating room formed by (33) and a door (34).

In the refrigerator constructed as described above, the machine room (1) is ventilated as described below. That is, the outside air is blown by the blower fan (5) and the outside air (2
Inhaled from 2). And intake duct (19), opening
(31), the sound source chamber (30), the opening (25) and the exhaust duct (26) in order, and is discharged to the outside from the exhaust port (28) through the ventilation passage in which at least a part of the soundproof material is arranged. .. As a result, the noise of the compressor (4) and the blower fan (5) generated in the sound source room (30) divided into the machine room (1) is separated by the partition plate (17).
And through the openings (31) and (25) provided in the top plate (3) to the exhaust ducts (26) provided adjacent to both sides of the intake duct (19) and the sound source chamber (30). .. Then, the noise radiated to the intake duct (19) is separated from the intake duct (19) and the partition plate (1
While being repeatedly reflected between 7), it is repeatedly absorbed by the soundproofing material 23 and reduced. Also, noise that has penetrated the partition plate (17) and entered the intake duct (19) is repeatedly reflected by the soundproof material (23) while being repeatedly reflected between the intake duct (19) and the partition plate (17). After reduction, some of the remaining noise is trapped in the outside air through the intake port (22).

Further, the noise radiated to the exhaust duct (26) is repeatedly reflected by the partition plate (27), the side plate (2) and the back plate (13), and is repeatedly absorbed by the soundproof material (29) to be reduced. .. Then, the remaining noise radiates to the outside air from the exhaust port (28). Therefore, a good soundproofing action can be obtained by a simple soundproofing structure by providing a small amount of soundproofing material (29), and the operating environment of the refrigerator can be quietened with a small manufacturing cost. It should be noted that FIG. 5 shows a comparison between the noise insulation effect of such a structure and the noise insulation effect of the conventional structures shown in FIGS. 35 and 36. That is, the vertical axis represents the level difference represented by (the level when the sound source is placed in the machine room (1))-(the level of the sound source).
It means the amplification factor of (1). The horizontal axis shows the 1/3 octave center frequency. 250 Hz in the structure of FIGS.
In all frequency bands except the band, a better noise insulation effect than the conventional structures shown in FIGS. 35 and 36 could be obtained.

Example 2. 6 and 7 are views showing another embodiment of the present invention. In the drawings, the same reference numerals as those in FIGS. 1 to 5 show the corresponding parts, and (22) is the intake duct side plate (20) and the deflection plate ( 20a)
Is an intake port formed by providing.

A bent portion is formed in the intake duct (19) of the refrigerator constructed as described above. As a result, a bend is formed in the noise that advances from the opening (31) of the sound source chamber (30) in the intake duct (19). Therefore, the intake duct
Since the noise is reflected by the deflection plate (20a) in the (19), the noise is further absorbed by the soundproofing material (23). Also in this embodiment, the sound source room (3
The noise of the compressor (4) and blower fan (5) generated in (0) is
Openings (31), (25) provided in the partition plate (17) and the top plate (3)
It is then radiated to the exhaust ducts (26) provided adjacent to both sides of the intake duct (19) and the sound source chamber (30). Therefore, although detailed description is omitted, it is obvious that the same operation as that of the embodiment of FIGS. 1 to 5 can be obtained in this embodiment.

FIG. 7 shows a comparison between the noise insulation effect of the structure as described above and the noise insulation function of the conventional structure shown in FIGS. 35 and 36. That is, the vertical axis represents the level difference represented by (the level when the sound source is placed in the machine room (1))-(the level of the sound source).
It means the amplification factor of (1). The horizontal axis shows the 1/3 octave center frequency. The structure of FIG. 6 is almost the same as the structure of FIGS. 1 to 4 in the frequency band of 315 Hz or less. However, in the frequency band of 800 Hz or higher, the noise insulation effect exceeding the structure of FIGS. 1 to 4 was obtained.

It should be noted that the increase in the level difference in the vicinity of the 630 Hz frequency band, which has appeared as a demerit in obtaining the noise insulation effect over the structure of FIGS. 1 to 4 in the frequency band of 800 Hz or more, is within the machine room (1). This is due to the resonance of. However, when compared with the conventional structure shown in FIGS. 35 and 36, the conventional structure has resonance in the 315 Hz frequency band, and the conventional structure does not use the intake duct (19). The absolute value level is larger than the structure. Therefore, the magnitude of the sound insulation effect of the entire noise is the sum of the sound insulation effects of the respective frequencies, so that the structure of FIGS. 1 to 4 and the structure of FIG.
Compared with the conventional structure shown in 6, it is possible to achieve much lower noise.

Example 3. FIG. 8 is also a diagram showing another embodiment of the present invention. In the figure, except for FIG. 8, the configuration is the same as in FIGS. 1 to 5, the same reference numerals as those in FIGS. 1 to 5 denote corresponding parts, and (39) is a soundproof material attached to the back plate (13), (27
Reference symbol a) is a claw provided on the partition plate (27), and reference symbol (40) is a condenser pipe clamped and retained by the claw (27a).

Also in this embodiment, the compressor (4) generated in the sound source room (30) divided into the machine room (1)
The noise of the blower fan (5) is adjacent to both sides of the intake duct (19) and the sound source room (30) through the openings (31) and (25) provided in the partition plate (17) and the top plate (3). And is radiated to the exhaust ducts (26) provided respectively. Therefore, although detailed description is omitted, it is obvious that the same operation as that of the embodiment of FIGS. 1 to 5 can be obtained in this embodiment. Also, the partition plate (27) equipped with the condenser pipe (40) functions as a heat dissipation plate,
The temperature inside the exhaust duct (26) rises. Therefore, an ascending air current is generated in the exhaust duct (26), the air flow velocity in the ventilation passage in the machine room (1) increases, and the temperature of the compressor (4) decreases. As a result, the rotation speed of the blower fan (5) can be reduced,
The noise level of the sound source itself is lowered, and the noise can be reduced.

Example 4. 9 to 16 are also views showing another embodiment of the present invention. In the figure, the same reference numerals as those in FIGS. 1 to 5 indicate corresponding parts, (41) is a bent portion formed in the longitudinal middle of the intake duct (19), and (42) is a bent portion of the intake duct (19).
An enlarged portion formed between the (41) and the sound source chamber (30) side opening (31), and (43) is an enlarged portion formed near the outside air side exhaust port (28) of the exhaust duct (26). ..

Also in this embodiment, the compressor (4) generated in the sound source room (30) divided into the machine room (1)
The noise of the blower fan (5) is adjacent to both sides of the intake duct (19) and the sound source room (30) through the openings (31) and (25) provided in the partition plate (17) and the top plate (3). And is radiated to the exhaust ducts (26) provided respectively. Therefore, although detailed description is omitted, it is obvious that the same operation as that of the embodiment of FIGS. 1 to 5 can be obtained in this embodiment. In addition, the intake duct (1
As shown in FIG. 12, 9) is a sound source room (30) side opening having an area H larger than the intake port (22) side area G provided with an enlarged portion (42).
(31) is formed. The exhaust duct (26) is shown in FIG.
The exhaust duct (26) is provided with an enlarged part (43) as shown in FIG.
An outside air exhaust port (28) having an area J larger than the intermediate area I is formed. As a result, in the heat radiation effect of the machine room (1), the air duct intake duct (1
9) The pressure loss at the outlet of the exhaust duct (26) can be reduced. Therefore, the air flow in the machine room (1) can be smoothed, and a good heat dissipation effect can be obtained.

FIG. 14 shows the structure of FIG. 9 to FIG.
FIG. 37 is a characteristic diagram showing a comparison of the noise insulating functions of the three members of the structure of FIG. 13 without the enlarged portions (42) and (43) and the conventional structures of FIGS. 35 and 36. That is, on the vertical axis (machine room
Level when sound source is inserted in (1))-(sound source level)
Represents the level difference, and means the amplification factor of the machine room (1) with respect to the sound source. The horizontal axis shows the 1/3 octave center frequency. According to FIG. 14, in the structure of FIGS. 9 to 13 without the expansion parts (42) and (43), the structure of FIG. 3 is used in all frequency bands except the frequency band of 250 Hz.
5, a better noise insulation effect than the conventional structure of FIG. 36 is obtained. In addition, in the case of the structures of FIGS.
It is possible to obtain substantially the same operation as the structure of FIG. 13 without the enlarged portions (42) and (43).

FIGS. 15 and 16 show the outlet areas of the intake duct (19) and the exhaust duct (26) according to the results of thermal analysis, and the compressor.
It is a figure which shows the relationship of the surface temperature of (4). 15 and 1
6, the vertical axis represents the sound source chamber (30) side opening (31) having an area H wider than the intake port (22) side area G, or the outside air having an area J wider than the exhaust duct (26) intermediate portion area I. The surface temperature of the compressor (4) at the side exhaust port (28) and the sound source chamber (30) side opening (31) having the same area H as the intake port (22) side area G, or the exhaust duct (26)
The difference with the surface temperature of the compressor (4) at the outside air side exhaust port (28) having the same area J as the intermediate area I is shown. The horizontal axis is the inlet (2
2) The ratio of the side area G to the sound source chamber (30) side opening (31) area H, and the ratio of the exhaust duct (26) middle area I to the outside air side exhaust port (28) area J are shown. Both FIG. 15 and FIG. 16 have the sound source chamber (30) side opening (31) having an area H larger than the intake port (22) side area G, and the outside air having an area J larger than the intermediate area I of the exhaust duct (26). Side exhaust port (2
By adopting 8), the surface temperature of the compressor (4) can be lowered. As a result, the heat dissipation effect in the machine room (1) is improved, so that the rotation speed of the blower fan (5) can be reduced, the life of the blower fan (5) can be extended, and the sound source The noise itself generated from the room (30) can be reduced.

The action obtained by the structures of FIGS. 9 to 13 can be obtained by enlarging the outlet of only one of the intake duct (19) and the exhaust duct (26). Further, even if the expansion direction of the outlet is only one set of two sides facing each other, the same operation as the structure of FIGS. 9 to 13 can be obtained. Also, intake duct (19), exhaust duct
The enlarged shape of the outlet of (26) can be substantially the same whether it is an enlarged local portion of the outlet or a shape that gradually expands from the inlet of the duct toward the outlet.

Example 5. 17 to 21 are also diagrams showing another embodiment of the present invention. In the figure, the same reference numerals as those in FIGS.
(45) is a base plate on which the floor surface of the sound source room (30) is formed on the upper side of the other side, (19) is a grooved recess (45) and the building floor surface where the machine room (1) is installed ( Intake duct composed of 46), (31) base plate
Intake duct (19) installed in (44) and communicating with the sound source room (30)
Of the defrosting water evaporation dish (24) is provided near the groove-shaped recess (45) of the base plate (44), and (47) is provided below the defrosting water evaporation dish (24). Is a condenser plate on which the condenser (6) is arranged.

Also in this embodiment, the compressor (4) generated in the sound source room (30) divided into the machine room (1).
And the noise of the blower fan (5) is adjacent to both sides of the intake duct (19) and the sound source chamber (30) through the openings (31) and (25) provided in the base plate (44) and the top plate (3). Exhaust duct provided for each
Emitted to (26). Therefore, although detailed description is omitted, it is obvious that the same operation as that of the embodiment of FIGS. 1 to 5 can be obtained in this embodiment. Also, by constructing the intake duct (19) as part of the building floor surface (46) in which the machine room (1) is installed, the structure of the intake duct (19) can be simplified and the manufacturing cost can be reduced. It can be reduced. Figure 21
FIG. 27 is a characteristic diagram showing a comparison of noise insulation effect between the structures of FIGS. 17 to 20 and the conventional structures of FIGS. 35 and 36. That is, the vertical axis represents a level difference represented by (level when a sound source is placed in the machine room (1))-(level of the sound source), and means an amplification factor of the machine room (1) with respect to the sound source. The horizontal axis shows the 1/3 octave center frequency.

In FIG. 21, the structures of FIGS. 17 to 20 were all in the frequency band, and a better noise insulation effect than that of the conventional structure was obtained. In particular, a significant noise insulation effect can be obtained in the frequency band of 800 Hz or higher. Since the increase and decrease of sound can be calculated by the energy sum of each frequency, FIG.
20. The structure of FIG. 20 can obtain a much larger noise reduction effect than the conventional structure.

Example 6. 22 to 25 are also diagrams showing another embodiment of the present invention. 17 to 2 in the figure.
The same symbols as 1 indicate the corresponding parts, and (26) are exhaust ducts which are horizontally arranged on the left and right of the rear part of the machine room (1).
It is formed by the rising recess of (3), the rear plate (16) and the duct plate (48). (25) is the opening of the exhaust duct (26) that is provided near the middle of the rear plate (16) of the machine room (1) and opens to the sound source room (30), and (28) is the exhaust port of the exhaust duct (26). , Machine room (1) side plate
(2) It is placed near the machine room (1) and communicates with the outside air through the rear plate (16) surface. (29) is a sound absorbing soundproof material attached to the inside of the exhaust duct (26).

Also in this embodiment, the compressor (4) generated in the sound source room (30) divided into the machine room (1)
And the noise of the blower fan (5) is caused by the base plate (44) and the opening (3
It is radiated to the exhaust duct (26) provided adjacent to the upper side of the intake duct (19) and the sound source chamber (30) via 1) and (25). Therefore, although detailed description is omitted, it is obvious that the same operation as that of the embodiment of FIGS. 1 to 5 can be obtained in this embodiment. In addition, the exhaust port (28) of the exhaust duct (26) is
(1) Since it is arranged on the rear plate (16) surface, it can be easily installed even when exhaust to the upper surface of the refrigerator is restricted.

FIG. 25 shows the structure of FIGS. 22 to 24 and FIG.
FIG. 5 is a characteristic diagram showing a comparison of the noise insulation effect between the two conventional structures of FIGS. That is, the vertical axis represents a level difference represented by (level when a sound source is placed in the machine room (1))-(level of the sound source), and means an amplification factor of the machine room (1) with respect to the sound source. The horizontal axis shows the 1/3 octave center frequency.

In FIG. 25, the structures of FIGS. 22 to 24 were all in the frequency band, and a better noise insulating effect than that of the conventional structure was obtained. In particular, a significant noise insulation effect can be obtained in the frequency band of 1 kHz or higher. Since the increase / decrease of sound can be calculated by the energy sum of the respective frequencies, the structure of FIGS. 22 to 24 can obtain a much larger noise reduction action than the conventional structure.

Example 7. 26 to 30 are also diagrams showing another embodiment of the present invention. 22 to 2 in the figure.
The same reference numeral as 5 indicates a corresponding portion, and (23) is a soundproof material attached to the intake duct (19), for example, Japanese Patent Laid-Open No. 1-1109996.
In the porous structure described in No. 4, the base plate (44) is arranged facing the side surface in the groove-shaped recess (45) at a distance, in the layer thickness direction and the layer surface direction. A porous structure (49) having a porous layer whose specific gravity is continuously changed in at least one side, a partition plate provided between the side surface in the groove-shaped recess (45) and the porous structure (49). (50) and side surface inside groove-shaped recess (45) and porous structure
A back air layer (51) consisting of an enclosed space formed between (49)
Is structured by. Reference numeral (29) is a soundproof material attached to the exhaust duct (26), which is, for example, a porous structure described in Japanese Patent Laid-Open No. 1-110996, and is opposed to the upper surface of the duct plate (48) at a distance. A porous structure (52) having a porous layer that is disposed and has a specific gravity continuously changed in at least one of the thickness direction of the layer and the surface direction of the layer, the upper surface of the duct plate (48) and the porous structure. (52) is formed by a separation plate (53) provided between (52) and a bottom air layer (54) consisting of a closed space formed between the upper surface of the duct plate (48) and the porous structure (52). There is.

Also in this embodiment, the compressor (4) generated in the sound source room (30) divided into the machine room (1).
And the noise of the blower fan (5) is caused by the base plate (44) and the opening (3
It is radiated to the exhaust duct (26) provided adjacent to the upper side of the intake duct (19) and the sound source chamber (30) via 1) and (25). Therefore, although detailed description is omitted, it is obvious that the same operation as that of the embodiment of FIGS. 1 to 5 can be obtained in this embodiment. In addition, the soundproof material (23) for the intake duct (19) and the exhaust duct
Since the soundproof material (29) of (26) is made of a porous structure and the back air layer (51) and the bottom air layer (54) are provided, a better noise sound insulation effect can be obtained.

FIG. 29 shows the structure of FIGS. 26 to 28 and FIG.
FIG. 5 is a characteristic diagram showing a comparison of the noise insulation effect between the two conventional structures of FIGS. That is, the vertical axis represents a level difference represented by (level when a sound source is placed in the machine room (1))-(level of the sound source), and means an amplification factor of the machine room (1) with respect to the sound source. The horizontal axis shows the 1/3 octave center frequency.

In FIG. 29, the structures of FIGS. 26 to 28 are all in the frequency band, and a better noise insulation effect than that of the conventional structure can be obtained. In particular, a significant noise insulation effect can be obtained in the frequency band of 600 Hz or higher. Since the increase and decrease of sound can be calculated by the energy sum of each frequency,
28. The structure of FIG. 28 can obtain a much larger noise reduction effect than the conventional structure.

As shown in FIG. 30, the back air layer (5
1), Thick bottom air layer (54) for relatively low frequency noise, and thin back air layer (51), bottom air layer (54) for relatively high frequency noise absorption Is obtained. Therefore, by appropriately changing the thicknesses of the back surface air layer (51) and the bottom surface air layer (54) depending on the frequency band of the radiated sound source, a required noise reducing action can be obtained. Further, even when the soundproof material of the porous structure is provided in either the intake duct (19) or the exhaust duct (26),
It is possible to obtain a noise insulating effect that is greater than that of the conventional structure shown in FIGS.

Example 8. 31 to 33 are also diagrams showing another embodiment of the present invention. In the figure, (33) is a refrigerator compartment.
Inner box forming (38) and provided with door (34), (55) is inner box (33)
The lower side of the refrigerator, that is, the bottom plate forming the lower part of the refrigerator, partially rises to form the side surface (56) and the ceiling (57) of the machine room (1). (44) is a base plate that forms the lower part of the machine room (1) and the rear wheel casters (36) are fixed, (58) is an outer plate that forms the end surface of the machine room (1), and (4) is a base plate ( Installed in 44) Machine room (1) Side
A compressor arranged adjacent to (56), (5) is installed on the base plate (44) and arranged adjacent to the side surface (56) of the machine room (1), and on the compressor (4). Blower fans, facing each other, (24)
Is a defrosting water evaporation tray provided adjacent to the base plate (44), (59) is a compressor cover having an exhaust port (60) and forming the other side surface of the machine room (1), (62) ) Is front wheel caster, (63) is base plate
An opening for cooling the machine room (1) provided on the side of the compressor cover (59) of (44), and (64) is a recess opened toward the side surface (56) of the machine room (1) of the bottom plate (55). In the machine room (1) and in the defrost water evaporation dish (24)
Communicate with.

In the refrigerator constructed as described above,
The outside air sucked from the opening (63) of the base plate (44) is blown to the compressor (4) by the blower fan (5) and the compressor (4)
To cool. The air blown at this time is compressed by the compressor (4).
At that time, part of the warmed air that changed the wind direction was the bottom plate.
The defrost water evaporation tray (24) enters from the recess (64) of (55). Then, after making a circuit in the defrost water evaporation tray (24), a blower fan
While returning to (5) and circulating, the defrost water in the defrost water evaporation dish (24) is evaporated. Further, the air from which the defrost water has been evaporated flows out of the machine room (1) from the exhaust port (60) of the compressor cover (59) together with the air that has cooled the compressor (4) again.

The noise in the machine room (1) is caused by the cold room (38).
The side wall (56) of the bottom plate (55) insulates the sound, and
In the opening of the lower surface of the door (34) near the door (34), the defrosting water evaporating dish (24) itself becomes a component member under the machine room (1), and the defrosting water evaporating dish (2)
It is blocked and sound-insulated by 4). For this reason, the machine room (1)
The noise is transmitted only from the opening (63) of the base plate (44) and the exhaust port (60) of the compressor cover (59) to reduce the noise transmitted to the outside and reduce the operating noise. You can

Example 9. FIG. 34 is also a diagram showing another embodiment of the present invention. In the figure, the same reference numerals as those in FIGS. 31 to 33 indicate corresponding parts, and (65) is a sound absorbing material mounted on the lower surface of the bottom plate (55) facing the defrosting water evaporation dish (24). Also in this embodiment, the noise in the machine room (1) is blocked by the side surface (56) of the bottom plate (55) near the refrigerating room (38), and the bottom plate (55)
The defrosted water evaporating dish (24) itself becomes a component below the machine room (1), and is closed by the defrosting water evaporating dish (24) to insulate the opening on the lower surface of the door (34). It Therefore, although detailed description is omitted, it is obvious that the same operation as that of the embodiment of FIGS. 31 to 33 can be obtained in this embodiment. Also, in the embodiment of FIG. 34, from the machine room (1) to the side surface of the bottom plate (55)
The noise transmitted to the space inside the defrost water evaporation tray (24) through the recess (64) near the (56) is absorbed by the sound absorbing material (65). For this reason, it is possible to obtain a better operation sound reducing action than the embodiment of FIGS.

[0050]

As described above, the present invention is provided in the rear part of a machine room in which a compressor forming a part of a refrigeration cycle, a blower fan for sending air to the compressor, and a defrost water evaporation tray are provided. A sound source chamber formed by a partition plate, in which a compressor and a blower fan as a sound source are arranged, an air intake duct that communicates with the sound source chamber at one end and the outside air at the other end, and is installed on both sides of the rear of the machine room. Is provided with an exhaust duct having one end connected to the sound source chamber and the other end communicating with the outside air, and a soundproof material arranged at least at a part of the air passage system formed by the intake duct and the exhaust duct. A sound source chamber in which a compressor and a blower fan, which are formed on the other side of the base plate having a groove-shaped recess on the lower side of one side and serve as a sound source, are arranged,
A defrosting water evaporating dish provided adjacent to the groove-shaped recess of the base plate,
It is formed in a groove-shaped recess of the base plate, and is provided with an air intake duct having one end connected to the sound source chamber and the other end connected to the outside air.

As a result, the noise of the compressor and the blower fan is repeatedly absorbed and reflected by the air duct soundproof material in the intake duct and the exhaust duct until the noise of the compressor and the blower fan is transmitted to the outside air. Further, noise that has penetrated into the intake duct and the exhaust duct through the wall that divides the sound source chamber is also repeatedly absorbed and reflected by the soundproof material of the air passage system. Therefore, a simple structure with a small amount of soundproof material provides a good soundproofing effect, and has the effect of quieting the operating environment.

Further, an exhaust duct having an opening area on the outside air side larger than the opening area on the sound source chamber side is provided. In addition, an intake duct having an opening area on the sound source chamber side wider than the opening area on the outside air side and an exhaust duct having an opening area on the outside air side wider than the opening area on the sound source chamber side are provided. is there. As a result, good soundproofing can be obtained by a simple structure with a small amount of soundproofing material, the effect of quieting the operating environment and the pressure loss of the air flow on the sound source room side of the intake duct and the outside air side of the exhaust duct are reduced, Ventilation in the machine room is smoothed, and the heat radiation effect of the machine room is made efficient.

Further, since the air intake duct is constructed with the building floor surface where the machine room is installed as a part, the structure of the air intake duct can be simplified and the manufacturing cost can be reduced.

Further, it is provided in at least a part of the air passage system formed by the intake duct and the exhaust duct, and the specific gravity is continuously changed in at least one of the layer thickness direction and the layer surface direction. A soundproof material made of a porous structure having layers is provided. This has the effect of obtaining a better noise insulation effect.

Further, a bottom plate provided in the lower part of the refrigerator and partially raised to form the other side surface of the machine room having an opening on one side and the ceiling, and a bottom plate forming the lower part of the machine room, are formed on the side surfaces, respectively. A base plate with a compressor for the refrigerator and a blower fan installed in the adjacent position, and a recess that is attached to the lower side of the bottom plate opposite to the machine room, and that is open to the side of the machine room on the bottom plate communicates with the machine room. However, a defrosting water evaporation dish that covers the lower surface of the refrigerator with a base plate is provided. In addition, a sound absorbing material is provided on the bottom surface of the bottom plate facing the defrost water evaporation tray. As a result, the opening formed on the lower surface of the refrigerator is closed by the defrosting water evaporating dish, and the air flow from the blower fan is generated between the machine room and the defrosting water evaporating dish due to the recess opening on the bottom plate near the side of the machine chamber. Distribute to. Therefore, the noise transmission port from the machine room is only the opening of the base plate and the exhaust port of the compressor cover, so that the noise transmitted to the outside is reduced and the operation noise is reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG.

4 is a cross-sectional view taken along the line CC of FIG.

FIG. 5 is a comparison diagram of soundproofing characteristics between the structure of FIGS. 1 to 4 and a conventional structure.

FIG. 6 is a view showing Embodiment 2 of the present invention and is equivalent to FIG.

FIG. 7 is a comparison diagram of soundproofing characteristics between the structure of FIG. 6 and a conventional structure.

FIG. 8 is a view showing a second embodiment of the present invention and is an enlarged view corresponding to a portion D in FIG. 4.

FIG. 9 is a perspective view showing Embodiment 4 of the present invention.

10 is a cross-sectional view taken along line EE of FIG.

11 is a sectional view taken along line FF of FIG.

FIG. 12 is a plan view conceptually showing the intake duct in FIG.

13 is an enlarged view of the upper end portion of the exhaust duct in FIG.

FIG. 14 is a comparative diagram of the soundproofing characteristics of the structure of FIGS. 9 to 13 and the structure of FIGS. 9 to 13 without the enlarged portion of the outlet of the intake duct and the exhaust duct and the conventional structure.

FIG. 15 is a diagram showing the relationship between the intake duct outlet area and the compressor surface temperature in FIG. 9;

16 is a diagram showing the relationship between the exhaust duct outlet area of FIG. 9 and the temperature of the compressor surface.

FIG. 17 is a perspective view showing a fifth embodiment of the present invention.

18 is a sectional view taken along line KK of FIG.

19 is a sectional view taken along line LL in FIG.

20 is a cross-sectional view taken along line MM of FIG.

FIG. 21 is a soundproof characteristic comparison diagram of the structure of FIGS. 17 to 20 and the conventional structure.

FIG. 22 is a perspective view showing Embodiment 6 of the present invention.

23 is a cross-sectional view taken along the line NN of FIG.

24 is a cross-sectional view taken along the line OO of FIG.

FIG. 25 is a comparison diagram of soundproofing characteristics between the structure of FIGS. 22 to 24 and the conventional structure.

FIG. 26 is a perspective view showing Embodiment 7 of the present invention.

27 is a cross-sectional view taken along the line PP of FIG.

28 is a sectional view taken along line QQ of FIG. 27.

FIG. 29 is a comparative diagram of the soundproofing characteristics of the structure of FIGS. 26 to 28 and the conventional structure.

30 is a graph showing the relationship between the thickness of the back air layer and the bottom air layer of FIG. 27 and the sound absorption coefficient.

FIG. 31 is a vertical sectional side view of a machine room showing an eighth embodiment of the present invention.

32 is a cross-sectional view taken along the line RR of FIG.

FIG. 33 is a cross-sectional plan view of the main parts of FIG. 31.

34 is a view corresponding to FIG. 31 and showing a ninth embodiment of the present invention.

FIG. 35 is a view showing a conventional refrigerator, which is equivalent to FIG. 2.

36 is a cross-sectional view taken along the line S-S of FIG. 35.

FIG. 37 is a view showing another conventional refrigerator, which is equivalent to FIG. 31.

38 is a bottom perspective view of FIG. 38. FIG.

[Explanation of symbols]

 1 Machine Room 2 Side Plate 4 Compressor 5 Blower Fan 16 Rear Plate 17 Partition Plate 19 Intake Duct 23 Sound Insulation Material 24 Defrost Water Evaporation Dish 26 Exhaust Duct 29 Sound Insulation Material 30 Sound Source Chamber 44 Bed Plate 45 Groove Recess 49 Porous Structure Body 52 Porous structure 55 Bottom plate 56 Side surface 57 Ceiling 64 Recess 65 Sound absorbing material

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hiromi Sano, 3-18-1, Oga, Shizuoka City, Shizuoka Plant, Mitsubishi Electric Corporation (72) Mitsuko Yagi 3--18-1, Oga, Shizuoka Mitsubishi Electric Engineering Ring Co., Ltd.Nagoya Office Shizuoka Branch

Claims (8)

[Claims] 1. A compressor forming part of a refrigeration cycle,
A machine room in which a blower fan for sending air to the compressor and a defrosting water evaporation tray are installed, and a sound source room in which the compressor and the blower fan, which are formed by a partition plate and serve as a sound source, are arranged And an air intake duct having one end communicating with the sound source chamber and the other end communicating with the outside air, and an exhaust duct provided on both rear sides of the machine chamber and extending upward so that one end communicates with the sound source chamber and the other end communicates with the outside air. A soundproof material provided on at least a part of an air duct system formed by the intake duct and the exhaust duct. 2. A compressor forming part of a refrigeration cycle,
A machine room in which a blower fan for sending air to the compressor and a defrosting water evaporation tray are installed, and a sound source room in which the compressor and the blower fan, which are formed by a partition plate and serve as a sound source, are arranged And an intake duct having one end communicating with the sound source chamber and the other end communicating with the outside air, and one provided on both sides of the rear part of the machine chamber and extending upward so that one end communicates with the sound source chamber and the other end communicates with the outside air. A refrigerator provided with an exhaust duct whose opening area on the side is wider than the opening area on the side of the sound source chamber, and a soundproof material provided in at least a part of the air passage system formed by the intake duct and the exhaust duct. .. 3. A compressor forming part of a refrigeration cycle,
A machine room in which a blower fan for sending air to the compressor and a defrosting water evaporation tray are installed, and a sound source room in which the compressor and the blower fan, which are formed by a partition plate and serve as a sound source, are arranged An air intake duct having one end communicating with the sound source chamber and the other end communicating with the outside air, the opening area on the sound source chamber side being larger than the opening area on the outside air side, and the rear side of the machine room. An exhaust duct whose one end communicates with the sound source chamber and the other end communicates with the outside air, and the opening area on the outside air side is wider than the opening area on the sound source chamber side, and the intake duct and the exhaust duct. A refrigerator comprising a soundproof material provided on at least a part of the formed air passage system. 4. A compressor forming part of a refrigeration cycle,
Formed on the machine room where a blower fan that sends air to this compressor and the defrost water evaporation tray are installed, and on the other side of the base plate that is provided inside this machine room and has a groove-like recess on the lower side of one side. Has been
It is formed in the sound source chamber in which the compressor and the blower fan as the sound source are arranged, the defrosting water evaporating dish provided adjacent to the grooved recess of the base plate, and the grooved recess of the base plate. An air-intake duct having one end communicating with the sound source chamber and the other end communicating with the outside air, and an exhaust duct provided on both sides of the rear part of the machine chamber and extending upward so that one end communicates with the sound source chamber and the other end communicates with the outside air. ,
A refrigerator comprising a soundproof material provided on at least a part of an air passage system formed by the intake duct and the exhaust duct. 5. A compressor forming part of a refrigeration cycle,
A machine room in which a blower fan for sending air to the compressor and a defrosting water evaporation tray are installed, and a sound source room in which the compressor and the blower fan, which are formed by a partition plate and serve as a sound source, are arranged And an air intake duct having one end communicating with the sound source chamber and the other end communicating with the outside air, and the middle portion of the rear plate of the machine chamber horizontally disposed in the rear portion of the machine chamber is the sound source chamber, and the side of the machine chamber side plate is the above. A refrigerator provided with an exhaust duct communicating with the outside air on the rear surface of a machine room, and a soundproof material provided on at least a part of an air passage system formed by the intake duct and the exhaust duct. 6. A compressor forming part of a refrigeration cycle,
A machine room in which a blower fan for sending air to the compressor and a defrosting water evaporation tray are installed, and a sound source room in which the compressor and the blower fan, which are formed by a partition plate and serve as a sound source, are arranged And an air intake duct having one end communicating with the sound source chamber and the other end communicating with the outside air, and the middle portion of the rear plate of the machine chamber horizontally disposed in the rear portion of the machine chamber is the sound source chamber, and the side of the machine chamber side plate is the above. An exhaust duct that communicates with the outside air on the rear surface of the machine room and at least a part of the air duct system formed by the intake duct and the exhaust duct are provided in at least one of the layer thickness direction and the layer surface direction. A refrigerator provided with a soundproof material made of a porous structure having a porous layer whose specific gravity is continuously changed. 7. A bottom plate which is provided at a lower part of the refrigerator and which partially rises to form a side surface and a ceiling on the other side of the machine room having an opening on one side, and a bottom plate which forms a lower part of the machine room and is formed on the side surface. A base plate on which the compressor for the refrigerator and the blower fan are installed in adjacent positions, respectively, and a recess that is attached to the lower side of the bottom plate opposite to the machine room side and is opened toward the side surface of the machine room of the bottom plate. A refrigerator provided with a defrosting water evaporating dish which communicates with the machine room by a place and covers the lower surface of the refrigerator with the base plate. 8. A bottom plate which is provided at a lower part of a refrigerator and which partially rises to form a side surface on the other side of a machine room having an opening on one side and a ceiling, and a bottom plate forming a lower part of the machine room on the side surface. A base plate on which the compressor for the refrigerator and the blower fan are installed in adjacent positions, respectively, and a recess that is attached to the lower side of the bottom plate opposite to the machine room side and is opened toward the side surface of the machine room of the bottom plate. A refrigerator provided with a defrosting water evaporating dish that communicates with the machine room by a certain place and covers the lower surface of the refrigerator with the base plate, and a sound absorbing material attached to the bottom plate lower surface facing the defrosting water evaporating dish.