JP2011027369A

JP2011027369A - Refrigerator

Info

Publication number: JP2011027369A
Application number: JP2009175998A
Authority: JP
Inventors: Takahito Kusano; 隆人草野
Original assignee: Hitachi Appliances Inc
Current assignee: Hitachi Appliances Inc
Priority date: 2009-07-29
Filing date: 2009-07-29
Publication date: 2011-02-10

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigerator with low noise and low vibration by suppressing vibrational noise of a machine chamber cover of the refrigerator by an inexpensive means. <P>SOLUTION: In this refrigerator in which the machine chamber having a compressor 4 and an evaporation pan 6 disposed at an upper section of the compressor 4 to receive defrost water is disposed at a lower section of a back side of the refrigerator, and a back side opening section of the machine chamber is provided with the metallic machine chamber cover 2 to cover its whole area, the evaporation pan 6 is fixed and supported by the machine chamber cover 2, and the strength of the machine chamber cover 2 is reinforced by keeping a side face of the evaporation pan 6 into closely contact with the machine chamber cover 2 in the fixed state. Further the evaporation pan 6 is configured to be supported only by the machine chamber cover 2, and not kept into contact with components at a refrigerator body 1 side and the compressor. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は冷蔵庫の静音化の技術分野に係り、特には、冷蔵庫の機械室カバーの低振動化と、それに伴う低騒音化の技術に関する。 The present invention relates to the technical field of noise reduction of a refrigerator, and more particularly to a technique for reducing vibration of a machine room cover of a refrigerator and a noise reduction associated therewith.

近年、住宅の防音性能が向上して屋外の騒音の少ない室内環境となっているため、従来よりも電化製品などの騒音が聞こえ易い。このような事情に伴い電化製品の静音化技術の重要性は増しており、特に冷蔵庫の場合は昼夜問わず常に稼動しているため静音化に対するニーズは高い。 In recent years, the soundproofing performance of houses has been improved to create an indoor environment with less outdoor noise, so that noise from electrical appliances and the like is easier to hear than in the past. With such circumstances, the importance of noise reduction technology for electrical appliances is increasing. Especially in the case of a refrigerator, there is a great need for noise reduction because it is always in operation day and night.

冷蔵庫における騒音は機械室内に設置された圧縮機や圧縮機を冷却するための送風ファン等が発生源となっている場合が多く、対策が重要である。従来の機械室構造の例として特許文献１および２を挙げる。 Countermeasures are important because noise in the refrigerator is often generated by a compressor installed in the machine room or a blower fan for cooling the compressor. Patent Documents 1 and 2 are given as examples of conventional machine room structures.

図５は特許文献１の、図６は特許文献２の機械室構造の概略図を示す。機械室は冷蔵庫背面下部に配置され、冷蔵庫本体底面に取付けられたベース部材３上に圧縮機４，送風ファン５等が設置され、圧縮機４の上部には圧縮機４からの排熱を受けて除霜水の蒸発を促進させることを目的とする蒸発皿６が配置され、蒸発皿６はネジやボスによって冷蔵庫本体１に固定支持される構造を有している。 FIG. 5 is a schematic view of the machine room structure of Patent Document 1 and FIG. The machine room is arranged at the lower part of the refrigerator back, the compressor 4, the blower fan 5, etc. are installed on the base member 3 attached to the bottom of the refrigerator main body, and the heat from the compressor 4 is received at the upper part of the compressor 4. An evaporating dish 6 for the purpose of promoting evaporation of the defrosted water is disposed, and the evaporating dish 6 has a structure that is fixedly supported on the refrigerator main body 1 by screws and bosses.

また機械室背面開口部は機械室カバー２によって覆われており、機械室カバー２はその外周部を冷蔵庫本体１および機械室ベース部材３にネジ等で固定されている。図５の例は蒸発皿６の取り外しを考慮して機械室カバー２が開口部全面を覆わず蒸発皿が外部に露出した構成であるが、遮音性において劣るため近年は機械室カバーで全面を覆う構造を取る場合がほとんどである。 The machine room back opening is covered with a machine room cover 2, and the machine room cover 2 is fixed to the refrigerator main body 1 and the machine room base member 3 with screws or the like. In the example of FIG. 5, the machine room cover 2 does not cover the entire opening in consideration of the removal of the evaporating dish 6, but the evaporating dish is exposed to the outside. In most cases, it takes a covering structure.

特開２０００−１１１２３５号公報JP 2000-111235 A 特開平１０−６２０５９号公報Japanese Patent Laid-Open No. 10-62059

冷蔵庫の機械室には、圧縮機４や圧縮機冷却用の送風ファン５など冷蔵運転中に振動を生じる部品が設置されており、これら部品の振動が機械室のベース部材３や冷蔵庫本体１との接触部を介して機械室カバー２に伝播することにより、機械室カバー２がスピーカの振動板のような働きをして騒音が発生しやすいという問題がある。 In the machine room of the refrigerator, components that generate vibrations during the refrigeration operation, such as the compressor 4 and the blower fan 5 for cooling the compressor, are installed. The vibrations of these components are connected to the base member 3 and the refrigerator main body 1 of the machine room. Is transmitted to the machine room cover 2 through the contact portion, and there is a problem that the machine room cover 2 acts like a diaphragm of a speaker and noise is likely to be generated.

前述の従来例のように圧縮機４の上部に配設された蒸発皿６が冷蔵庫本体１に固定されている構造の場合、冷蔵庫本体１から蒸発皿６に振動が伝わるが、この蒸発皿６と機械室カバー２が接触する構造であると、そこに振動伝達経路が形成され、機械室カバー２から騒音が発生する原因となることがあった。 In the case of the structure in which the evaporating dish 6 disposed on the upper portion of the compressor 4 is fixed to the refrigerator body 1 as in the above-described conventional example, vibration is transmitted from the refrigerator body 1 to the evaporating dish 6. If the machine room cover 2 is in contact with the machine room cover 2, a vibration transmission path is formed there, which may cause noise from the machine room cover 2.

現在では蒸発皿６と機械室カバー２の間には隙間を設けて非接触として蒸発皿６が振動騒音の原因はならない構造が一般的であるが、これは振動系から切り離し悪影響を及ぼさないようにしているだけで低振動化へ積極的な寄与はしない。 At present, there is a general structure in which a gap is provided between the evaporating dish 6 and the machine room cover 2 so that the evaporating dish 6 does not cause vibration noise as a non-contact, but this is separated from the vibration system so as not to have an adverse effect. It does not make a positive contribution to reducing vibrations.

その一方で、ベース部材３等からの振動伝達により機械室カバー２の振動音が発生した場合、これを抑えるためには機械室カバー２の素材の板厚増により剛性や質量を上げたり、防振部材を使用するなどの対策を施したりする必要があるが、素材使用量増加や部品追加のためのコストが発生することも問題である。 On the other hand, when vibration noise of the machine room cover 2 is generated due to vibration transmission from the base member 3 or the like, in order to suppress this, the rigidity or mass is increased by increasing the thickness of the material of the machine room cover 2 or It is necessary to take measures such as using a vibration member, but there is also a problem in that the amount of material used increases and the cost for adding parts is generated.

本発明は、新規な蒸発皿の取付け構造を提案することにより、安価な手段からなる低振動・低騒音構造を有する冷蔵庫を提供することを目的とするものである。 An object of the present invention is to provide a refrigerator having a low-vibration and low-noise structure composed of inexpensive means by proposing a novel evaporating dish mounting structure.

本発明の目的を達成するための手段は、冷蔵庫の機械室内に配備される除霜水の蒸発皿の固定取付先を前記機械室のカバーに限定して固定するという手段である。 Means for achieving the object of the present invention is a means for fixing and fixing a defrosting water evaporating dish mounted in the machine room of the refrigerator limited to the cover of the machine room.

このような手段によれば、従来振動低減に寄与していなかった蒸発皿を、機械室カバーにのみ固定して、蒸発皿で機械室カバー平面部を押さえるようにして機械室カバーを補強することができ、その蒸発皿の固定状態においては蒸発皿は機械室カバーのみによって支持され、その蒸発皿が冷蔵庫本体や圧縮機など他の部品とは接触せず、その蒸発皿を介する機械室カバーへの振動伝達経路が形成されない構成となり、蒸発皿による機械室カバーの面補強と、蒸発皿を介する機械室カバーへの振動伝達経路の遮断とにより、機械室カバーの振動を抑制して冷蔵庫の低振動・低騒音化が蒸発皿を防振部材に兼用しつつ安価に達成できる。 According to such means, the evaporating dish that has not contributed to vibration reduction is fixed only to the machine room cover, and the machine room cover is reinforced by pressing the machine room cover flat portion with the evaporating dish. In the fixed state of the evaporating dish, the evaporating dish is supported only by the machine room cover, and the evaporating dish does not come into contact with other parts such as the refrigerator main body and the compressor, and the evaporating dish is moved to the machine room cover through the evaporating dish. The vibration transmission path of the machine room cover is not formed, the surface of the machine room cover is reinforced by the evaporating dish, and the vibration transmission path to the machine room cover through the evaporating dish is blocked, thereby suppressing the vibration of the machine room cover and reducing the refrigerator Vibration and low noise can be achieved at low cost while using the evaporating dish as a vibration isolator.

本発明によれば、冷蔵庫の機械室カバーの面補強を蒸発皿を利用して補強し、且つ蒸発皿への振動の伝達経路を極力遮断できるようになったので、安価な手段からなる低振動・低騒音構造を有する冷蔵庫を提供できる。 According to the present invention, the surface reinforcement of the machine room cover of the refrigerator is reinforced by using the evaporating dish and the vibration transmission path to the evaporating dish can be blocked as much as possible. -A refrigerator having a low noise structure can be provided.

本発明の実施例１による冷蔵庫の機械室を説明する図にして、（Ａ）図はその機械室内を周辺要部を断面にして示した斜視図であり、（Ｂ）図はその機械室に採用された機械室カバーと蒸発皿の組立体の斜視図である。It is a figure explaining the machine room of the refrigerator by Example 1 of this invention, (A) The figure is the perspective view which showed the surrounding principal part in the cross section, and (B) figure is the machine room. It is a perspective view of the assembly of the employ | adopted machine room cover and an evaporating dish. 本発明の実施例１による冷蔵庫の機械室カバーの振動解析結果を説明する図にして、（Ａ）図は蒸発皿が機械室カバーに固定されていない場合の機械室カバーの変形モードを示す図、（Ｂ）図は同じく機械室カバーに蒸発皿を固定取付けした場合の機械室カバーの変形モードを示す図である。It is a figure explaining the vibration analysis result of the machine room cover of the refrigerator by Example 1 of this invention, (A) figure is a figure which shows the deformation | transformation mode of a machine room cover when the evaporating dish is not fixed to the machine room cover. (B) is a figure which similarly shows the deformation | transformation mode of a machine room cover at the time of fixing and attaching an evaporating dish to a machine room cover. 本発明の実施例２による冷蔵庫に採用される蒸発皿の斜視図である。It is a perspective view of the evaporating dish employ | adopted as the refrigerator by Example 2 of this invention. 本発明の実施例３による冷蔵庫に採用される蒸発皿と機械室カバーの組立体の斜視図である。It is a perspective view of the assembly of the evaporating dish and machine room cover employ | adopted as the refrigerator by Example 3 of this invention. 従来の機械室構造の第１例を示す概略図である。It is the schematic which shows the 1st example of the conventional machine room structure. 従来の機械室構造の第２例を示す概略図である。It is the schematic which shows the 2nd example of the conventional machine room structure.

本発明の一実施例にあっては、冷蔵庫本体の背面下部の機械室に圧縮機と同圧縮機上部に蒸発皿を配設した構造を有する冷蔵庫において、従来振動低減に寄与していなかった蒸発皿の側面と機械室カバー平面部とを密着した状態でネジ等を用いて固定して機械室カバーに蒸発皿を用いて面補強を施し、蒸発皿を機械室カバーに支持した構成としている。その固定状態においては蒸発皿は機械室カバーのみによって支持され、冷蔵庫本体や圧縮機など他の部品とは接触せず、蒸発皿を介する振動伝達経路が形成されない構成としている。 In one embodiment of the present invention, in a refrigerator having a structure in which an evaporating dish is provided in the upper part of the compressor in the machine room at the lower back of the refrigerator main body, evaporation that has not conventionally contributed to vibration reduction is provided. The plate is fixed with screws or the like in a state where the side surface of the plate and the machine room cover flat part are in close contact with each other, surface reinforcement is applied to the machine chamber cover using an evaporating plate, and the evaporating plate is supported by the machine room cover. In the fixed state, the evaporating dish is supported only by the machine room cover, does not come into contact with other parts such as the refrigerator body and the compressor, and the vibration transmission path through the evaporating dish is not formed.

このような構成を採用すると、蒸発皿の側面を機械室カバーに密着させた状態で固定し機械室カバー平面部を押さえることによって機械室カバーを補強することができるため、振動抑制効果が得られる。この際、蒸発皿は機械室カバー以外とは接触していないため蒸発皿自体が振動伝達経路となって振動・騒音を生じさせる可能性を除去することについても考慮されている。また、従来より冷蔵庫で一般的に用いられる部品である蒸発皿を防振部材としても兼用する構造であるため、防振材などの新規部品追加や素材板厚増加などの一般的な防振対策とは異なり、コスト上昇が生じないことも利点の一つである。 By adopting such a configuration, since the machine room cover can be reinforced by fixing the side surface of the evaporating dish in close contact with the machine room cover and pressing the machine room cover flat surface portion, a vibration suppressing effect can be obtained. . At this time, since the evaporating dish is not in contact with any part other than the machine room cover, it is considered to eliminate the possibility that the evaporating dish itself becomes a vibration transmission path to generate vibration and noise. In addition, since the evaporating dish, which is a part commonly used in refrigerators, is also used as an anti-vibration member, general anti-vibration measures such as adding new parts such as anti-vibration materials and increasing the thickness of the material One of the advantages is that there is no cost increase.

以下に、一層詳細に本発明の各実施例を図を用いて解説する。 The embodiments of the present invention will be described below in more detail with reference to the drawings.

図１は実施形態の第１例を示すもので図１（Ａ）のように、冷蔵庫本体１の背面下部に位置する機械室の背面側開口部は開口部の全面が鉄板製の機械室カバー２で覆われている。その機械室カバー２には通風口として複数個のスリット穴１１が設けられている。冷蔵庫本体１の底部に固定されたベース部材３には、圧縮機４，圧縮機冷却用の送風ファン５などの部品が設置され、圧縮機４の上部には機械室カバー２に固定された樹脂製の蒸発皿６が配設されている。 FIG. 1 shows a first example of the embodiment. As shown in FIG. 1 (A), the back side opening of the machine room located at the lower back of the refrigerator body 1 is a machine room cover whose entire surface is made of iron plate. 2 is covered. The machine room cover 2 is provided with a plurality of slit holes 11 as ventilation openings. Parts such as a compressor 4 and a blower fan 5 for cooling the compressor are installed on the base member 3 fixed to the bottom of the refrigerator body 1, and a resin fixed to the machine room cover 2 on the top of the compressor 4. An evaporating dish 6 made of metal is disposed.

図１（Ｂ）のように、機械室カバー２には蒸発皿６が固定されている。即ち、機械室カバーに対面している蒸発皿６の側面の１面を蒸発皿固定面６ａとして機械室カバー２の平面部と密着した状態でネジ７により固定した構造である。 As shown in FIG. 1B, the evaporating dish 6 is fixed to the machine room cover 2. In other words, one of the side surfaces of the evaporating dish 6 facing the machine chamber cover is fixed as the evaporating dish fixing surface 6a with the screw 7 in close contact with the flat portion of the machine chamber cover 2.

蒸発皿６は機械室カバー２のみによって支持されるため機械室カバー２を冷蔵庫本体１に取付けた場合でも蒸発皿は冷蔵庫本体１や圧縮機４と接触することは無いため、蒸発皿６自体が振動の伝達経路となって機械室カバー２の振動を増大させることはない。 Since the evaporating dish 6 is supported only by the machine room cover 2, even when the machine room cover 2 is attached to the refrigerator body 1, the evaporating dish does not come into contact with the refrigerator body 1 or the compressor 4. The vibration of the machine room cover 2 does not increase as a vibration transmission path.

図２は機械室カバー２に蒸発皿６が固定取付されているか否かの違いによる機械室カバー２の振動状況を求めるための振動解析結果を示しており、図２（Ａ）は蒸発皿６がない機械室カバー２単体の場合、図２（Ｂ）は蒸発皿６を蒸発皿取付け位置８の領域で機械室カバー２に固定して取付けた場合についての機械室カバー２の振動モードを変形量で示すものである。 FIG. 2 shows a vibration analysis result for determining the vibration state of the machine room cover 2 depending on whether or not the evaporating dish 6 is fixedly attached to the machine room cover 2. FIG. 2B, the vibration mode of the machine room cover 2 when the evaporating dish 6 is fixedly attached to the machine room cover 2 in the region of the evaporating dish attachment position 8 is modified. It is shown in quantity.

その解析によれば、図２（Ａ）で振動の腹となっている機械室カバー２の中央部が、図２（Ｂ）では蒸発皿取付け位置８において蒸発皿６で押さえられたことにより変形を抑制されており、図２（Ａ）のように最大変形量は前者で２.１mmに対したが、図２（Ｂ）のように後者では１.７mmとなり１９％の低減効果が見られ、機械室カバー２の振動およびその振動を原因とした騒音の発生を抑制することが可能である。 According to the analysis, the central portion of the machine chamber cover 2 which is the antinode of vibration in FIG. 2A is deformed by being pressed by the evaporating dish 6 at the evaporating dish mounting position 8 in FIG. As shown in Fig. 2 (A), the maximum deformation amount was 2.1mm in the former, but the latter was 1.7mm in the latter as shown in Fig. 2 (B), showing a 19% reduction effect. It is possible to suppress the vibration of the machine room cover 2 and the generation of noise due to the vibration.

さらに言えば、機械室カバー２の形状や寸法が変わっても、振動解析などにより単体の振動モードが分かっていれば振動の腹に相当する部位と蒸発皿６の取付け位置を合わせることなどの最適化を図ることで効果的に振動および騒音の低減を行うことが可能である。 Furthermore, even if the shape and dimensions of the machine room cover 2 change, if the single vibration mode is known by vibration analysis or the like, the position corresponding to the vibration antinode and the mounting position of the evaporating dish 6 are optimally matched. Therefore, it is possible to effectively reduce vibration and noise.

図３は実施形態の第２例による冷蔵庫に採用される蒸発皿６の斜視図を示している。図３に示すように、機械室カバー２と対面する蒸発皿６の側面には、変形防止を目的とした格子状の補強リブ９が設けられている。蒸発皿６はその補強リブ９を蒸発皿６の構成メンバーとして備えている。 FIG. 3: has shown the perspective view of the evaporating dish 6 employ | adopted as the refrigerator by the 2nd example of embodiment. As shown in FIG. 3, lattice-shaped reinforcing ribs 9 for preventing deformation are provided on the side surface of the evaporating dish 6 facing the machine room cover 2. The evaporating dish 6 includes the reinforcing rib 9 as a constituent member of the evaporating dish 6.

そのような補強された蒸発皿６の機械室カバー２との固定方法は実施例１と同様にネジによる固定方法が採用されるが、機械室カバー２と密着するのは補強リブ９の端面となる。その補強リブ９が機械室カバー２の平面に密着して、蒸発皿６の側面と機械室カバーの平面と補強リブ９によるボックス状の強固な組立体が構成されて、機械室カバー２の面補強が強化される。 As for the method of fixing the reinforced evaporating dish 6 to the machine room cover 2, a screw fixing method is adopted as in the first embodiment, but the machine room cover 2 is in close contact with the end surface of the reinforcing rib 9. Become. The reinforcing rib 9 is brought into close contact with the plane of the machine room cover 2 to form a box-like strong assembly by the side surface of the evaporating dish 6, the plane of the machine room cover, and the reinforcing rib 9. Reinforcement is strengthened.

その上、蒸発皿６が樹脂成形品の場合、成形条件によって多少の歪みや反りが生じることで機械室カバー２との密着性が低下する可能性があるため、これを防止するために補強リブ９を上述のように採用することは有効な手段である。 In addition, when the evaporating dish 6 is a resin molded product, there is a possibility that adhesion with the machine room cover 2 may be reduced due to some distortion or warping depending on molding conditions. Adopting 9 as described above is an effective means.

その他の構成は実施例１と同様である。 Other configurations are the same as those of the first embodiment.

図４は実施形態の第３例による冷蔵庫に採用される蒸発皿６と機械室カバー２との組立体を示している。図４のように、蒸発皿６と機械室カバー２の密着面の間には防振材としてゴムシート１０を挟み込んだ構造であり、実施例１と同様な振動抑制効果に加えて、ゴムシート１０による機械室カバー２の振動減衰効果も期待できる。 FIG. 4 shows an assembly of the evaporating dish 6 and the machine room cover 2 employed in the refrigerator according to the third example of the embodiment. As shown in FIG. 4, a rubber sheet 10 is sandwiched between the evaporating dish 6 and the machine room cover 2 as a vibration-proof material. In addition to the vibration suppressing effect similar to that of the first embodiment, the rubber sheet The vibration damping effect of the machine room cover 2 by 10 can also be expected.

なお防振材の材質はゴムに限らず、フォーム材などを用いても同様の効果を期待できる。 Note that the material of the vibration isolator is not limited to rubber, and the same effect can be expected by using a foam material or the like.

本発明は、冷蔵庫の機械室カバーの振動に起因する騒音の低減手段として利用可能性がある。 The present invention can be used as a means for reducing noise caused by vibration of a machine room cover of a refrigerator.

１冷蔵庫本体
２機械室カバー
３ベース部材
４圧縮機
５送風ファン
６蒸発皿
６ａ蒸発皿固定面
７ネジ
８蒸発皿取付け位置
９補強リブ
１０ゴムシート DESCRIPTION OF SYMBOLS 1 Refrigerator main body 2 Machine room cover 3 Base member 4 Compressor 5 Blower fan 6 Evaporating dish 6a Evaporating dish fixing surface 7 Screw 8 Evaporating dish attachment position 9 Reinforcement rib 10 Rubber sheet

Claims

冷蔵庫の機械室内に配備される除霜水の蒸発皿の固定取付先を前記機械室のカバーに限定して固定してある冷蔵庫。 A refrigerator in which a fixed attachment destination of an evaporating dish for defrost water disposed in a machine room of a refrigerator is limited to a cover of the machine room.

請求項１において、前記冷蔵庫は、背面下部の機械室に圧縮機や送風ファンを設置し、前記圧縮機の上部に除霜水を一時的に溜め圧縮機の排熱を利用して蒸発を促進させるための蒸発皿を配置し、前記機械室の冷蔵庫背面側の開口部には開口部の全面を覆う機械室カバーを設置して前記機械室内の部品が露出しない構造を有する冷蔵庫であって、
前記蒸発皿の側面と前記機械室カバーの平面部とは相互に対面して密着状態とされ、
前記蒸発皿は、前記冷蔵庫の本体や圧縮機や送風ファンと接触しないように前記機械室カバーのみで支持されていることを特徴とする冷蔵庫。 2. The refrigerator according to claim 1, wherein a compressor and a blower fan are installed in a machine room at the lower back of the refrigerator, and defrost water is temporarily stored in the upper part of the compressor to promote evaporation using exhaust heat of the compressor. A refrigerator having a structure in which a machine room cover that covers the entire surface of the opening is installed in the opening on the refrigerator back side of the machine room so that components in the machine room are not exposed,
The side surface of the evaporating dish and the flat portion of the machine room cover face each other and are in close contact with each other,
The said evaporating dish is supported only by the said machine room cover so that it may not contact with the main body of the said refrigerator, a compressor, or a ventilation fan, The refrigerator characterized by the above-mentioned.

請求項２において、前記蒸発皿はその側面に補強リブが設けられ、前記蒸発皿の補強リブが前記機械室カバーと密着して前記蒸発皿が前記機械室カバーに固定されていることを特徴とする冷蔵庫。 3. The evaporating dish according to claim 2, wherein a reinforcing rib is provided on a side surface of the evaporating dish, the reinforcing rib of the evaporating dish is in close contact with the machine chamber cover, and the evaporating dish is fixed to the machine chamber cover. Refrigerator.

請求項２において、前記蒸発皿の側面と前記機械室カバーの平面部との間にシート状の弾性部材を挟み込んで、前記蒸発皿が前記機械室カバーに固定されていることを特徴とする冷蔵庫。 The refrigerator according to claim 2, wherein a sheet-like elastic member is sandwiched between a side surface of the evaporating dish and a flat portion of the machine room cover, and the evaporating dish is fixed to the machine room cover. .

請求項１から請求項４までのいずれか一項において、前記機械室カバーには通風口として複数個のスリット穴が設けられていることを特徴とする冷蔵庫。 The refrigerator according to any one of claims 1 to 4, wherein the machine room cover is provided with a plurality of slit holes as ventilation holes.