【０００１】
【発明の属する技術分野】
本発明は、冷凍空調装置に用いる、圧縮機に関し、特に圧縮機起動時に底部の潤滑油から発泡する冷媒の発泡音に関するものである。
【０００２】
【従来の技術】
従来の圧縮機は、圧縮要素を潤滑する潤滑油を密閉容器底部に貯留し、潤滑油を滞留させる油槽を形成するよう密閉容器の底部に固着された遮油板を備え、密閉容器内を油槽が連通する連通孔を遮油板に設け、密閉容器底部に設けた油槽内に潤滑油を封ずることにより圧縮機の再運転時に潤滑油に溶解した冷媒の発泡気化を遅延し始動負荷を軽減する（例えば、特許文献１参照。）。
【０００３】
また、別の従来の圧縮機は、主軸が貫通する仕切板によって区画された上部に固定および揺動スクロールと、揺動スクロールおよび主軸の軸受とを収納し、下部に油溜めを有し、主軸に設けられた油穴により油溜めと軸受を連通させるスクロール圧縮機において、仕切板の底部に折り返しを有する穴あけ加工を施すことにより、仕切板の上面に堰を有する開口を設けた（例えば、特許文献２参照。）。
【０００４】
【特許文献１】
実開平０４−４４４８５号公報（第６頁、第７頁、第１図、第２図）
【特許文献２】
実用新案第２５２４１７８号公報（第１頁〜第３頁、図１、図４）
【０００５】
【発明が解決しようとする課題】
しかしながら、特許文献１に示された従来の圧縮機においては、密閉容器１内に、連通孔を有した遮油板を有するが、この連通孔は孔が大きい場合、圧縮機の起動時に気化した冷媒は連通孔を大きな気泡のまま通過し、潤滑油相を突破り発泡音及び衝撃を生じさせていた。また、遮蔽板に連通孔が設けられているため、気化した大きな気泡が遮蔽板の下で破れる場合があり発泡音及び衝撃を生じさせていた。圧縮機内に貯留されている液冷媒の量が多いほど、また、密閉容器内の圧力低下速度が速いほど液冷媒の気化、発泡時に生ずる発泡音、衝撃は大きく、圧縮機の静音性、信頼性に問題が生じていた。
【０００６】
また、特許文献２に示された従来の圧縮機においては、仕切板がシェルの横断面のほぼ全体に設けられているため、堰には上部の軸受を潤滑後に返油孔を経た潤滑油と吸入管からの液冷媒とが共に貯まり、更に、両者仕切板中央部の主軸との隙間から底部の油溜めに戻るので、堰には液冷媒を分離溜めることができない。そこで、圧縮機の起動時に気化した冷媒は、主軸に設けられた油穴及び仕切板に設けた底部に折り返しを有する穴を通過するが、その際、大きな気泡のまま潤滑油相を突破り発泡音及び衝撃を生じさせていた。
【０００７】
本発明は、前記従来技術の課題を解消するためになされたものであり、圧縮機起動時の発泡に伴う発泡音及び衝撃を低減し、静音性の高い圧縮機を得ることを目的とする。
【０００８】
【課題を解決するための手段】
本発明に係る圧縮機は、密閉容器内に圧縮機構部と電動機部とを有し、密閉容器内を吸入圧力雰囲気とし、冷媒と相溶性のない潤滑油を用いた圧縮機において、密閉容器内の底部の潤滑油貯めに発泡金属又はステンレスメッシュを配設したものである。
【０００９】
【発明の実施の形態】
実施の形態１．
以下、実施の形態１について図に基づいて説明する。図１はこの発明の実施の形態１のレシプロ型圧縮機の縦断面図である。
図１において、レシプロ型圧縮機は固定子４及び回転子６からなる電動機部ａ、及び電動機部ａにより駆動される圧縮機構部ｂにより構成されている。
圧縮機構部ｂは、回転子６に固定された駆動軸７、駆動軸７を支持するシリンダブロック８に併設された軸受９、駆動軸７の偏芯部１４に接続されたコンロッド１０、コンロッド１０に接続されたピストン１１、ピストン１１と圧縮室を構成するようにシリンダブロック８に併設されたシリンダ１２、及びシリンダヘッド１３から構成されている。
【００１０】
これら電動機部ａ及び圧縮機構部ｂは密閉容器１内に弾性支持部材１７により保持され収納されている。
また密閉容器１には、密閉容器１底部の潤滑油貯め５に固着された発泡金属１８が配設される。
また、潤滑油５は冷媒と相溶性を有さない潤滑油が封入されている。例えば、冷媒はＲ１３４ａ、潤滑油はアルキルベンゼン油の組合せである。
【００１１】
以上のように構成された密閉型圧縮機について、その動作について説明する。
電動機部ａに通電され、回転子６が回転し、回転子６に固定された駆動軸７が回転し、コンロッド１０を介しピストン１１はシリンダ１２内壁に沿って往復運動を行う。この往復運動により吸入管３３から密閉容器１に吸入された冷媒ガスが、シリンダヘッド１３に設けられた吸入口（図示しない）から吸入され、ついで、シリンダ１２でピストン１１により圧縮され、圧縮ガスはシリンダヘッド１３に設けられた吐出口（図示しない）から密閉容器１内に開放されることなく、吐出管３４により冷凍サイクルへ送り出される。
【００１２】
このようなレシプロ型圧縮機において、停止時間が長い場合又は圧縮機の周囲の温度が低い場合などに、冷凍サイクル内の液冷媒が密閉容器１内に吸入管３３より流入し、密閉容器１の底部に貯留される場合がある。このような状態で、圧縮機が起動されると、密閉容器１内が吸入圧力雰囲気であるため、圧縮機の起動に伴い密閉容器１内の圧力は低下し、密閉容器１の底部の潤滑油貯め５に貯留された液冷媒は気化、発泡する。
【００１３】
本実施の形態では、密閉容器１の底部の潤滑油貯め５に発泡金属１８が配設されているので、液冷媒の気化に際し生じる気泡は、発泡金属１８の細かな孔により細かく分散され、細かな気泡となっており、潤滑油層を突破り、破れる時に生じる発泡音は極小に抑えられる。また、発泡音が発生する時に生じる衝撃も極小に抑えられ、静音性に優れ信頼性の高い圧縮機が得られることになる。
【００１４】
更に冷媒の発泡音の発生メカニズムを詳細に記す。
液冷媒が密閉容器１の底部の潤滑油貯め５に滞留する場合、液冷媒と潤滑油とは相溶性を有さないため、２相分離しかつ冷媒が下層となる。この状態から密閉容器１内の圧力が低下すると、液冷媒の一部が気泡化する。この気泡化したガス冷媒は浮力により上昇し、潤滑油層に到達し、更に上昇し潤滑油層を突破り、気泡が破れる際に発泡音が生じる。
気泡が破れる際に発生する発泡音は、粘度が高い潤滑油を突破る場合の方が粘度の低い例えば、同じ冷媒を突破るよりも大きくなるとみなされる。気泡が破れる瞬間は粘度の高い潤滑油が気泡の膜となるため、破れる際のエネルギーが大きくなり、発泡音も大きくなる。
【００１５】
従って、このような冷媒気泡の発泡音を小さくするために、潤滑油を突破り破れる際の気泡をできるだけ細かくする。
上記では、発泡金属１８で液冷媒の気泡を小さくすることを記載したが、より望ましくは、密閉容器１の底部の潤滑油と液冷媒の２相界面より上の潤滑油層に発泡金属１８が在るようにすれば、液冷媒の気泡はかならず発泡金属１８を通過するため、確実に小さくできる。発泡金属１８は密閉容器１の底部に設置し、高さを予想される２相界面以上にしてもいいし、また、２相界面より上の潤滑油層に適宜、設置してもよい。
この場合、図１に示すように、圧縮機機構部ｂ等の潤滑のため、潤滑油を駆動軸７の油路等に供給する駆動軸７の下端部の近傍は発泡金属１８を設置しないようにしてもよい。このようにすれば、発泡音低下の効果が得られるとともに、潤滑油の汲み上げに支障をきたさない。
【００１６】
本実施の形態で、レシプロ型圧縮機について説明したが、圧縮の形態を問わず密閉容器１内が吸入圧力雰囲気とした圧縮機の密閉容器１の底部に発泡金属１８を配設すれば同様に上記のような効果が得られる。
尚、冷媒と潤滑油の組合せはＲ１３４ａとアルキルベンゼン油の組合せで説明したが、冷媒はＲ１３４ａ、Ｒ４１０ａ、Ｒ４０７Ｃ等のＨＦＣ系冷媒、潤滑油はアルキルベンゼン油、鉱油の冷媒と潤滑油との組合せであれば同様な効果が得られる。
【００１７】
実施の形態２．
次に、実施の形態２について説明する。図２は実施の形態２のレシプロ型圧縮機の縦断面図である。
図２に示すように本実施の形態のレシプロ型圧縮機は、実施の形態１のレシプロ型圧縮機における密閉容器１の底部の潤滑油貯め５内の発泡金属１８の替わりに、ステンレスメッシュ１９が配設される。
その他の構成は、実施の形態１と同じである。また、液冷媒の気泡を小さくするために密閉容器１の底部にステンレスメッシュ１９の設置方法についても、実施の形態１の発泡金属１８と同様とする。
【００１８】
本実施の形態においても、密閉容器１底部にステンレスメッシュ１９が配設されているので、液冷媒が気化した際に生じる気泡は、ステンレスメッシュの細かな目により細かく分散され、潤滑油層を突破る時には細かな気泡となり、発泡音は極小に抑えられる。また、発泡音が発生する時に生じる衝撃も極小に抑えられ、静音性に優れ信頼性の高い圧縮機が得られる。
【００１９】
レシプロ型圧縮機以外の圧縮機でも密閉容器内が吸入圧力雰囲気とした圧縮機の密閉容器底部にステンレスメッシュを配設すれば上記と同様な効果が得られる。
また、冷媒と潤滑油の組合せはＲ１３４ａとアルキルベンゼン油の組合せで説明したが、冷媒はＲ１３４ａ，Ｒ４１０ａ、Ｒ４０７Ｃ等のＨＦＣ系冷媒、潤滑油はアルキルベンゼン油、鉱油の組合せであれば同様な効果が得られる。
【００２０】
実施の形態１、２では密閉容器１内の底部に配設する部材を発泡金属、ステンレスメッシュで説明を行ったが、気化した冷媒の気泡を細かく分散させることができる多孔質体であれば同様な効果が得られる。
【００２１】
実施の形態３．
次に実施の形態３について説明する。図３はこの発明の実施の形態３のレシプロ型圧縮機の縦断面図である。
図３のレシプロ型圧縮機は、実施の形態１または実施の形態２において、密閉容器１の底部の潤滑油貯め５の発泡金属１８またはステンレスメッシュ１９を取外し、密閉容器１の内壁１ａで、吸入管３３の密閉容器１内の開口部３３ａの直下に、吸入冷媒中の液冷媒を受ける受け部２０をなす堰部２０が設けられる。この堰部２０は、底部の潤滑油貯め５の上方で、かつ、吸入管３３の密閉容器１内の開口部３３ａの直下で、密閉容器１の内壁１ａの一部に設けられ、上部の潤滑部からの潤滑油は受けずに、吸入管３３の開口部３３ａからの液冷媒を受けるようにする。
その他の構成は、実施の形態１、２と同じである。
【００２２】
本実施の形態においては、密閉容器１内の吸入管３３の開口部３３ａの直下に吸入管３３から流入した液冷媒を堰き止めるための堰部２０が設けられていることにより、吸入管３３から流入した液冷媒２は堰部２０に貯留され、密閉容器１内の底部に貯留されている潤滑油５とは殆ど混在しないことになる。
このため、圧縮機の起動時の液冷媒２の気化は、ほとんど液冷媒のみの堰部２０からの気化であるため、生じる気泡が冷媒と相溶性のない、かつ粘度の高い潤滑油の層を突破ることはなく、気泡が破れる瞬間は、粘度の低い液冷媒が気泡の膜となるため、潤滑油層を突破る時に生じる大きな発泡音は生じない。そのため、静音性に優れた圧縮機が得られる。
なお、液冷媒の気泡は、粘度の低い液冷媒を突破るため発生音は小さい。即ち、気泡が破れる瞬間は、粘度の低い液冷媒が気泡の膜となるため、容易に破れやすく、破れる際のエネルギーは小さいため、発泡音も小さい。
【００２３】
本実施の形態のレシプロ型圧縮機は、堰部２０を設けるとともに、実施の形態１の発泡金属１８または実施の形態２のステンレスメッシュ１９を潤滑油貯め５に併せて設ければ、少量の液冷媒が底部の潤滑油貯め５に混入しても、圧縮機の起動時に底部の潤滑油貯め５から気化する冷媒の冷媒音も防止でき、より発泡音の低下を図ることができる。
【００２４】
本実施の形態のレシプロ型圧縮機も、密閉容器内が吸入圧力雰囲気とした圧縮機であればレシプロ型圧縮機以外でもよい。
また、冷媒と潤滑油の組合せはＲ１３４ａとアルキルベンゼン油の組合せで説明したが、冷媒はＲ１３４ａ，Ｒ４１０ａ、Ｒ４０７Ｃ等のＨＦＣ系冷媒、潤滑油はアルキルベンゼン油、鉱油の組合せであれば同様な効果が得られる。
【００２５】
【発明の効果】
本発明に係わる圧縮機によれば、密閉容器内に圧縮機構部と電動機部とを有し、密閉容器内を吸入圧力雰囲気とし、冷媒と相溶性のない潤滑油を用いた圧縮機において、密閉容器内の底部の潤滑油貯めに発泡金属又はステンレスメッシュを配設したので、気泡が潤滑油層を突破る時に生じる発泡音及び発泡に伴う衝撃を極小に抑えることが可能となる。従って、静音性が高い圧縮機を得ることができる。
【図面の簡単な説明】
【図１】本発明の実施の形態１におけるレシプロ圧縮機の縦断面図である。
【図２】本発明の実施の形態２におけるレシプロ圧縮機の縦断面図である。
【図３】本発明の実施の形態３におけるレシプロ圧縮機の縦断面図である。
１ 密閉容器、１ａ 内壁、５ 潤滑油貯め、１８ 発泡金属、１９ ステンレスメッシュ、２０ 受け部、３３ 吸入管、３３ａ 開口部、ａ 電動機部、ｂ 圧縮機構部。[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a compressor used for a refrigeration air conditioner, and more particularly to a foaming sound of a refrigerant foaming from a lubricating oil at a bottom portion when a compressor is started.
[0002]
[Prior art]
Conventional compressors have a lubricating oil that lubricates a compression element at the bottom of a closed container, and has an oil barrier plate fixed to the bottom of the closed container to form an oil tank for retaining the lubricating oil. A communication hole that communicates with the oil is provided in the oil shield plate, and the lubricating oil is sealed in the oil tank provided at the bottom of the sealed container, delaying the bubbling and vaporization of the refrigerant dissolved in the lubricating oil when the compressor is restarted, and reducing the starting load (For example, see Patent Document 1).
[0003]
Another conventional compressor houses a fixed and orbiting scroll, an orbiting scroll and a bearing of the main shaft at an upper portion defined by a partition plate through which the main shaft passes, and has an oil reservoir at a lower portion, and has a main shaft. In a scroll compressor in which an oil sump and a bearing communicate with each other by an oil hole provided in a partition plate, an opening having a weir is provided on an upper surface of the partition plate by performing a boring process having a turn on the bottom of the partition plate (for example, see Patent Reference 2).
[0004]
[Patent Document 1]
Japanese Utility Model Laid-Open No. 04-44485 (Page 6, Page 7, FIG. 1, FIG. 2)
[Patent Document 2]
Utility Model No. 2524178 (Pages 1 to 3, FIGS. 1 and 4)
[0005]
[Problems to be solved by the invention]
However, in the conventional compressor disclosed in Patent Document 1, an oil barrier plate having a communication hole is provided in the hermetically sealed container 1, and when the communication hole has a large hole, the oil vaporized when the compressor was started. The refrigerant passed through the communicating holes as large bubbles, breaking through the lubricating oil phase and producing foaming noise and impact. Further, since the communication hole is provided in the shielding plate, large vaporized gas bubbles may be broken under the shielding plate, thereby generating foaming noise and impact. The greater the amount of liquid refrigerant stored in the compressor, and the faster the pressure drop rate in the closed container, the greater the sound and bubbling sound generated during vaporization and bubbling of the liquid refrigerant, and the quietness and reliability of the compressor. Had a problem.
[0006]
Further, in the conventional compressor disclosed in Patent Document 2, since the partition plate is provided on almost the entire cross section of the shell, the dam is lubricated with lubricating oil that has passed through the oil return hole after lubricating the upper bearing. The liquid refrigerant from the suction pipe is stored together, and further returns to the oil reservoir at the bottom from the gap between the main shaft at the center of the partition plate and the liquid refrigerant at the bottom, so that the liquid refrigerant cannot be separated and stored in the weir. Therefore, the refrigerant vaporized at the start of the compressor passes through an oil hole provided on the main shaft and a hole provided with a turn at the bottom provided on the partition plate. It caused sound and impact.
[0007]
SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems of the related art, and an object of the present invention is to reduce a foaming sound and an impact caused by foaming at the time of starting the compressor, and to obtain a compressor with high noise reduction.
[0008]
[Means for Solving the Problems]
The compressor according to the present invention has a compression mechanism section and an electric motor section in a closed container, and sets the inside of the closed container to a suction pressure atmosphere, and uses a lubricating oil that is incompatible with a refrigerant. A foamed metal or stainless steel mesh is disposed in the lubricating oil reservoir at the bottom of the above.
[0009]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiment 1 FIG.
Hereinafter, Embodiment 1 will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of a reciprocating compressor according to Embodiment 1 of the present invention.
In FIG. 1, the reciprocating compressor includes an electric motor section a including a stator 4 and a rotor 6, and a compression mechanism section b driven by the electric motor section a.
The compression mechanism b includes a drive shaft 7 fixed to the rotor 6, a bearing 9 attached to a cylinder block 8 supporting the drive shaft 7, a connecting rod 10 connected to an eccentric portion 14 of the drive shaft 7, a connecting rod 10. , A cylinder 12 and a cylinder head 13 which are provided in the cylinder block 8 so as to form a compression chamber with the piston 11.
[0010]
The electric motor section a and the compression mechanism section b are held and housed in the closed casing 1 by the elastic support member 17.
Further, in the closed container 1, a foam metal 18 fixed to the lubricating oil reservoir 5 at the bottom of the closed container 1 is provided.
The lubricating oil 5 is filled with a lubricating oil having no compatibility with the refrigerant. For example, the refrigerant is a combination of R134a and the lubricating oil is a combination of an alkylbenzene oil.
[0011]
The operation of the hermetic compressor configured as described above will be described.
Electric power is supplied to the motor unit a, the rotor 6 rotates, the drive shaft 7 fixed to the rotor 6 rotates, and the piston 11 reciprocates along the inner wall of the cylinder 12 via the connecting rod 10. By this reciprocating motion, the refrigerant gas drawn into the closed casing 1 from the suction pipe 33 is drawn through a suction port (not shown) provided in the cylinder head 13, and then compressed by the piston 11 in the cylinder 12, and the compressed gas is The liquid is sent out to the refrigeration cycle by the discharge pipe 34 without being opened into the closed container 1 from a discharge port (not shown) provided in the cylinder head 13.
[0012]
In such a reciprocating compressor, when the stop time is long or when the temperature around the compressor is low, the liquid refrigerant in the refrigeration cycle flows into the closed vessel 1 from the suction pipe 33, May be stored at the bottom. When the compressor is started in such a state, the pressure in the closed container 1 decreases with the start of the compressor because the inside of the closed container 1 is in the suction pressure atmosphere, and the lubricating oil at the bottom of the closed container 1 The liquid refrigerant stored in the storage 5 evaporates and foams.
[0013]
In the present embodiment, since the foam metal 18 is provided in the lubricating oil reservoir 5 at the bottom of the closed container 1, bubbles generated when the liquid refrigerant is vaporized are finely dispersed by the fine holes of the foam metal 18. The foaming sound breaks through the lubricating oil layer and the bubbling sound generated when it breaks is minimized. In addition, the shock generated when the foaming sound is generated is suppressed to a minimum, and a compressor with excellent silentness and high reliability can be obtained.
[0014]
Further, the generation mechanism of the foaming sound of the refrigerant will be described in detail.
When the liquid refrigerant stays in the lubricating oil reservoir 5 at the bottom of the closed container 1, the liquid refrigerant and the lubricating oil have no compatibility, so that they are separated into two phases and the refrigerant becomes a lower layer. When the pressure in the closed container 1 decreases from this state, a part of the liquid refrigerant becomes bubbles. The gasified gas refrigerant rises due to buoyancy, reaches the lubricating oil layer, further rises and breaks through the lubricating oil layer, and a foaming sound is generated when bubbles are broken.
The foaming sound generated when the air bubbles are broken is considered to be louder when breaking through a high-viscosity lubricating oil than when breaking through a low-viscosity lubricant, for example. At the moment when the bubble is broken, the high-viscosity lubricating oil becomes a film of the bubble, so that the energy at the time of breaking increases and the foaming sound also increases.
[0015]
Therefore, in order to reduce the foaming noise of the refrigerant bubbles, the bubbles when breaking through and breaking the lubricating oil are made as small as possible.
In the above description, the bubbles of the liquid refrigerant are reduced by the foam metal 18. However, more preferably, the foam metal 18 exists in the lubricating oil layer above the two-phase interface between the lubricating oil and the liquid refrigerant at the bottom of the closed container 1. By doing so, the bubbles of the liquid refrigerant always pass through the foam metal 18, so that the bubbles can be reliably reduced. The foamed metal 18 may be installed at the bottom of the closed vessel 1 and may have a height equal to or higher than the expected two-phase interface, or may be appropriately installed in a lubricating oil layer above the two-phase interface.
In this case, as shown in FIG. 1, in order to lubricate the compressor mechanism b and the like, the vicinity of the lower end of the drive shaft 7 for supplying the lubricating oil to the oil passage of the drive shaft 7 is not provided with the foam metal 18. It may be. In this case, the effect of reducing the foaming sound can be obtained, and the pumping of the lubricating oil is not hindered.
[0016]
In the present embodiment, the reciprocating compressor has been described. However, regardless of the type of compression, if the foamed metal 18 is disposed at the bottom of the closed vessel 1 of the compressor in which the inside of the closed vessel 1 has a suction pressure atmosphere. The effects described above can be obtained.
Although the combination of the refrigerant and the lubricating oil has been described by using the combination of R134a and the alkylbenzene oil, the refrigerant may be a combination of an RFC-based refrigerant such as R134a, R410a, and R407C, and the lubricating oil may be an alkylbenzene oil or a combination of a mineral oil refrigerant and a lubricating oil. A similar effect can be obtained.
[0017]
Embodiment 2 FIG.
Next, a second embodiment will be described. FIG. 2 is a longitudinal sectional view of the reciprocating compressor according to the second embodiment.
As shown in FIG. 2, the reciprocating compressor of the present embodiment has a stainless mesh 19 instead of the foam metal 18 in the lubricating oil reservoir 5 at the bottom of the closed vessel 1 in the reciprocating compressor of the first embodiment. Will be arranged.
Other configurations are the same as those of the first embodiment. Further, the method of installing the stainless steel mesh 19 on the bottom of the closed vessel 1 in order to reduce bubbles of the liquid refrigerant is the same as that of the foam metal 18 of the first embodiment.
[0018]
Also in the present embodiment, since the stainless steel mesh 19 is provided at the bottom of the closed container 1, bubbles generated when the liquid refrigerant is vaporized are finely dispersed by the fine mesh of the stainless steel mesh and break through the lubricating oil layer. Occasionally, it becomes fine bubbles and the foaming sound is suppressed to a minimum. In addition, the shock generated when the foaming sound is generated is suppressed to a minimum, and a compressor with excellent silentness and high reliability can be obtained.
[0019]
In a compressor other than the reciprocating compressor, the same effect as described above can be obtained by disposing a stainless steel mesh at the bottom of the closed vessel of the compressor in which the inside of the closed vessel has a suction pressure atmosphere.
Further, the combination of the refrigerant and the lubricating oil has been described by using the combination of R134a and the alkylbenzene oil. However, the same effect can be obtained if the refrigerant is an HFC-based refrigerant such as R134a, R410a, R407C, and the lubricating oil is a combination of the alkylbenzene oil and the mineral oil. Can be
[0020]
In the first and second embodiments, the member disposed at the bottom in the closed container 1 has been described as a foamed metal or a stainless steel mesh. However, the same applies to a porous body capable of finely dispersing bubbles of a vaporized refrigerant. Effects can be obtained.
[0021]
Embodiment 3 FIG.
Next, a third embodiment will be described. FIG. 3 is a longitudinal sectional view of a reciprocating compressor according to Embodiment 3 of the present invention.
In the reciprocating compressor shown in FIG. 3, the foam metal 18 or the stainless steel mesh 19 of the lubricating oil reservoir 5 at the bottom of the closed container 1 is removed in the first or second embodiment, and suction is performed on the inner wall 1a of the closed container 1. Immediately below the opening 33 a of the pipe 33 in the closed container 1, there is provided a weir section 20 which forms a receiving section 20 for receiving the liquid refrigerant in the suction refrigerant. The weir portion 20 is provided on a part of the inner wall 1 a of the sealed container 1 above the lubricating oil reservoir 5 at the bottom and directly below the opening 33 a of the suction pipe 33 in the sealed container 1. The liquid refrigerant is received from the opening 33a of the suction pipe 33 without receiving the lubricating oil from the section.
Other configurations are the same as those of the first and second embodiments.
[0022]
In the present embodiment, the dam 20 is provided immediately below the opening 33 a of the suction pipe 33 in the closed container 1 so as to stop the liquid refrigerant flowing from the suction pipe 33. The inflowing liquid refrigerant 2 is stored in the weir section 20, and hardly mixes with the lubricating oil 5 stored in the bottom of the closed vessel 1.
For this reason, since the vaporization of the liquid refrigerant 2 at the time of starting the compressor is almost the vaporization from the weir portion 20 containing only the liquid refrigerant, the generated bubbles form a layer of the lubricating oil that is not compatible with the refrigerant and has high viscosity. At the moment when the bubble breaks, the liquid refrigerant having a low viscosity becomes a film of the bubble at the moment when the bubble breaks, so that a loud bubbling sound generated when breaking through the lubricating oil layer does not occur. Therefore, a compressor excellent in noise reduction can be obtained.
In addition, since the bubbles of the liquid refrigerant break through the liquid refrigerant having a low viscosity, the generated sound is small. That is, at the moment when the bubble is broken, the liquid refrigerant having a low viscosity becomes a film of the bubble, so that it is easily broken, and the energy at the time of breaking is small.
[0023]
In the reciprocating compressor of the present embodiment, a small amount of liquid is provided by providing the weir portion 20 and providing the foam metal 18 of the first embodiment or the stainless steel mesh 19 of the second embodiment together with the lubricating oil reservoir 5. Even if the refrigerant is mixed into the lubricant oil reservoir 5 at the bottom, the noise of the refrigerant vaporized from the lubricant oil reservoir 5 at the start of the compressor can be prevented, and the foaming noise can be further reduced.
[0024]
The reciprocating compressor of the present embodiment may be other than the reciprocating compressor as long as the inside of the closed container has a suction pressure atmosphere.
Although the combination of the refrigerant and the lubricating oil has been described as the combination of R134a and the alkylbenzene oil, similar effects can be obtained if the refrigerant is an HFC-based refrigerant such as R134a, R410a, R407C, and the lubricating oil is a combination of alkylbenzene oil and mineral oil. Can be
[0025]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to the compressor which concerns on this invention, it has a compression mechanism part and an electric motor part in a closed container, makes the inside of a closed container into a suction pressure atmosphere, and uses a lubricating oil incompatible with a refrigerant | coolant. Since the metal foam or the stainless steel mesh is disposed in the lubricating oil reservoir at the bottom of the container, it is possible to minimize the bubbling sound and the shock accompanying the bubbling generated when air bubbles break through the lubricating oil layer. Therefore, a compressor with high silence can be obtained.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a reciprocating compressor according to Embodiment 1 of the present invention.
FIG. 2 is a longitudinal sectional view of a reciprocating compressor according to Embodiment 2 of the present invention.
FIG. 3 is a longitudinal sectional view of a reciprocating compressor according to Embodiment 3 of the present invention.
1 Closed container, 1a inner wall, 5 lubricating oil storage, 18 foam metal, 19 stainless steel mesh, 20 receiving part, 33 suction pipe, 33a opening, a electric motor part, b compression mechanism part.
