JP2017075531A - Hermetic compressor and apparatus equipped with the same - Google Patents

Hermetic compressor and apparatus equipped with the same Download PDF

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Publication number
JP2017075531A
JP2017075531A JP2015201706A JP2015201706A JP2017075531A JP 2017075531 A JP2017075531 A JP 2017075531A JP 2015201706 A JP2015201706 A JP 2015201706A JP 2015201706 A JP2015201706 A JP 2015201706A JP 2017075531 A JP2017075531 A JP 2017075531A
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Prior art keywords
boundary
dead center
center side
connection
piston
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大佑 関根
Daisuke Sekine
大佑 関根
大沼　敦
Atsushi Onuma
敦 大沼
将宏 城谷
Masahiro Shirotani
将宏 城谷
山口　和也
Kazuya Yamaguchi
和也 山口
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Hitachi Appliances Inc
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Hitachi Appliances Inc
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Priority to JP2015201706A priority Critical patent/JP2017075531A/en
Priority to CN201610887548.1A priority patent/CN106567817B/en
Publication of JP2017075531A publication Critical patent/JP2017075531A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/0005—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00 adaptations of pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
    • F04B39/02—Lubrication
    • F04B39/0223—Lubrication characterised by the compressor type
    • F04B39/023—Hermetic compressors

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Compressor (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a hermetic compressor which can evenly supply lubrication oil to the inner peripheral surface of a cylinder and the outer peripheral surface of a piston and improve holding power of the supplied lubrication oil, and an apparatus equipped with the same.MEANS FOR SOLVING THE PROBLEM: A hermetic compressor comprises a piston which reciprocates between a top dead center side and a bottom dead center side in the axial direction, and the piston has grooves surrounding a hole in which a piston pin is provided. The groove comprises a top dead center side boundary which lies on the top dead center side of the hole and is provided in the circumferential direction, a bottom dead center side boundary which lies on the bottom dead center side of the hole and is provided in the circumferential direction, a first connection boundary which connects one end side of the top dead center side boundary and one end side of the bottom dead center side boundary, and a second connection boundary which connects the other end side of the top dead center side boundary and the other end side of the bottom dead center side boundary. The axial length of the first connection boundary or the second connection boundary is equal to or longer than the axial length of the hole, and the first connection boundary or the second connection boundary has a straight line portion almost parallel to the axial direction.SELECTED DRAWING: Figure 3

Description

本発明は、密閉型圧縮機及びこれを備えた機器に関する。   The present invention relates to a hermetic compressor and a device including the same.

家庭用冷蔵庫に使用されている小容量の密閉型圧縮機では、冷蔵庫の省エネルギ化の要求が高まり、インバータ制御による圧縮機の低速運転化が図られてきている。このため、冷蔵庫用密閉型圧縮機の低速運転時の一層の効率向上と摺動部の信頼性向上が求められている。   In small-capacity hermetic compressors used in household refrigerators, there is an increasing demand for energy saving in refrigerators, and low-speed operation of compressors by inverter control has been attempted. For this reason, the further efficiency improvement at the time of the low-speed driving | operation of the closed compressor for refrigerators and the reliability improvement of a sliding part are calculated | required.

特許文献１には、少なくとも下死点付近で密閉容器内の空間と連通している部分において溝部を平面展開したときの形状が、ピストン軸心との平行線を形成しない形状とすることが記載されている（請求項１、図３）。   Patent Document 1 describes that the shape when the groove is planarly developed in a portion communicating with the space in the sealed container at least near the bottom dead center does not form a parallel line with the piston axis. (Claim 1, FIG. 3).

特開２００６−１６９９９８号公報JP 2006-169998 A

特許文献１では、ピストンの外周の上側面および下側面に形成する溝部の形状をピストンのスカート側面側に張り出す略半月上の形状とし、スカート側面側に張り出す部分の曲率をピストンのトップ側面側とのつなぎＲの曲率より小さくしているため、ピストンのスカート横側面の摺動面に充分な潤滑油を供給することができず、ピストンとシリンダ間の摺動部の潤滑性が低下するおそれがある。   In Patent Document 1, the shape of the groove formed on the upper and lower side surfaces of the outer periphery of the piston is a substantially half-moon shape that projects to the skirt side surface of the piston, and the curvature of the portion that projects to the skirt side surface is the top side surface of the piston Since the curvature is smaller than the curvature of the joint R with the side, sufficient lubricating oil cannot be supplied to the sliding surface of the side surface of the piston skirt, and the lubricity of the sliding portion between the piston and the cylinder is lowered. There is a fear.

そこで、本発明は、シリンダの内周面とピストンの外周面へ均一に潤滑油を供給し、供給した潤滑油の保持力を向上させることで、圧縮効率と信頼性を向上した密閉型圧縮機およびこれを備えた機器を提供することを目的とする。   Accordingly, the present invention provides a hermetic compressor with improved compression efficiency and reliability by uniformly supplying lubricating oil to the inner peripheral surface of the cylinder and the outer peripheral surface of the piston and improving the holding power of the supplied lubricating oil. And it aims at providing the apparatus provided with this.

上記事情に鑑みてなされた本発明は、軸方向に沿って上死点側及び下死点側を往復動するピストンを備え、該ピストンは、ピストンピンが設けられた孔を囲む溝を有する密閉型圧縮機であって、前記溝は、前記孔より上死点側に位置し、周方向に沿って設けられた上死点側境界と、前記孔より下死点側に位置し、周方向に沿って設けられた下死点側境界と、前記上死点側境界の一端側及び前記下死点側境界の一端側を結ぶ第１連結境界と、前記上死点側境界の他端側及び前記下死点側境界の他端側を結ぶ第２連結境界と、を備え、前記第１連結境界及び／又は前記第２連結境界の軸方向長さは、前記孔の軸方向長さ以上であり、前記第１連結境界及び／又は前記第２連結境界は、軸方向に略平行な直線部を有することを特徴とする。   The present invention made in view of the above circumstances includes a piston that reciprocates on the top dead center side and the bottom dead center side along the axial direction, the piston having a groove surrounding a hole provided with a piston pin. In the type compressor, the groove is located on the top dead center side with respect to the hole, and is located on the top dead center side boundary provided along the circumferential direction, and on the bottom dead center side with respect to the hole. A bottom dead center side boundary, a first connection boundary connecting one end side of the top dead center side boundary and one end side of the bottom dead center side boundary, and the other end side of the top dead center side boundary. And a second connection boundary connecting the other end side of the bottom dead center side boundary, and the axial length of the first connection boundary and / or the second connection boundary is equal to or greater than the axial length of the hole. The first connection boundary and / or the second connection boundary has a straight portion substantially parallel to the axial direction.

本発明によれば、シリンダの内周面とピストンの外周面へ均一に潤滑油を供給し、供給した潤滑油の保持力を向上させることで圧縮効率と信頼性を向上した密閉型圧縮機およびこれを備えた機器を提供することができる。   According to the present invention, a hermetic compressor having improved compression efficiency and reliability by supplying lubricating oil uniformly to the inner peripheral surface of the cylinder and the outer peripheral surface of the piston and improving the holding power of the supplied lubricating oil, and A device provided with this can be provided.

実施形態１の密閉型圧縮機の縦断面図1 is a longitudinal sectional view of a hermetic compressor according to a first embodiment. 図１のＡ−Ａ断面図AA sectional view of FIG. （ａ）は実施形態１のピストンの上面図、（ｂ）はピストンの側面図(A) is a top view of the piston of Embodiment 1, (b) is a side view of the piston. 実施形態１の上面（下面）溝の平面展開図Plane development of the upper surface (lower surface) groove of Embodiment 1 図３（ｂ）のＢ−Ｂ線による軸方向視の断面図Sectional drawing of the axial view by the BB line of FIG.3 (b) 実施形態１のピストンの斜視図The perspective view of the piston of Embodiment 1. ピストンが下死点のときの要部拡大断面図An enlarged cross-sectional view of the main part when the piston is at bottom dead center 冷蔵庫の断面図Cross section of refrigerator

以下、本発明の実施形態を、添付の図面を参照しつつ詳細に説明する。同様の構成要素には同様の符号を付し、同様の説明は繰り返さない。なお、本発明はこれらの実施形態に限定されるものではなく、様々な変形例が含まれる。   Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. Similar components are denoted by the same reference numerals, and the same description will not be repeated. In addition, this invention is not limited to these embodiment, Various modifications are included.

（実施形態１）
［密閉型圧縮機１００の全体構成］
図１は、密閉型圧縮機１００の縦断面図、図２は、図１のＡ−Ａ断面である。 (Embodiment 1)
[Entire configuration of hermetic compressor 100]
FIG. 1 is a longitudinal sectional view of a hermetic compressor 100, and FIG. 2 is an AA section of FIG.

密閉型圧縮機１００は、密閉容器１内にステータ２ａとロータ２ｂからなる電動要素２と圧縮要素３を収納している。圧縮要素３は、軸受部５ｃとフレーム部５ｂが一体に成形されたシリンダブロック５に形成されたシリンダ５ａ内を、コンロッド６によりクランク軸８の偏心軸８ｂに連結されたピストン７が往復運動するレシプロ式である。クランク軸８は、シリンダブロック５の軸受部５ｃに回転自在に嵌められた主軸８ａの下部で電動要素２のロータ２ｂに固定される。圧縮要素３は、フレーム部５ｂの下部に固定された電動要素２のステータ２ａを介してコイルスプリングにより密閉容器１の底部に弾性的に支持されている。   The hermetic compressor 100 houses an electric element 2 and a compression element 3 including a stator 2 a and a rotor 2 b in a hermetic container 1. In the compression element 3, the piston 7 connected to the eccentric shaft 8b of the crankshaft 8 by the connecting rod 6 reciprocates in the cylinder 5a formed in the cylinder block 5 in which the bearing portion 5c and the frame portion 5b are integrally formed. Reciprocating. The crankshaft 8 is fixed to the rotor 2 b of the electric element 2 at the lower part of the main shaft 8 a that is rotatably fitted to the bearing portion 5 c of the cylinder block 5. The compression element 3 is elastically supported on the bottom of the hermetic container 1 by a coil spring via a stator 2a of the electric element 2 fixed to the lower part of the frame part 5b.

電動要素２のロータ２ｂが回転することによってクランク軸８が回転し、偏心軸８ｂ偏心回転して偏心軸８ｂに連結されたコンロッド６を介し、ピストン７がシリンダ５ａのボア内を往復動するようになっている。ピストン７の往復動方向は、ピストン７の軸方向に略平行である。   When the rotor 2b of the electric element 2 rotates, the crankshaft 8 rotates, and the piston 7 reciprocates in the bore of the cylinder 5a via the connecting rod 6 that is eccentrically rotated and connected to the eccentric shaft 8b. It has become. The reciprocating direction of the piston 7 is substantially parallel to the axial direction of the piston 7.

なお、クランク軸８の回転によって、密閉容器１内の底部に貯留された潤滑油４は、クランク軸８の下端に取り付けられたオイルポンプ８ｃの粘性ポンプ作用で引き上げられる。そして、主軸８ａ外周に形成されたスパイラル溝８ｄを介して上方に導かれ、さらに偏心軸８ｂに回転自在に嵌合されたコンロッド６の大端軸受部から小端軸受部を通じてピストン７に固定嵌合されているピストンピン９の潤滑を行い、偏心軸８ｂの上端に取り付けられたバランスウエイト１０を一部貫通する形で設けられた潤滑油放射孔８ｂｂから噴射され、最後に偏心軸８ｂの上端部から周囲に噴射される。噴射された潤滑油４は油受け部１１に当たり、切欠き部１２を伝ってピストン７の外周面２０に供給される。   Note that the lubricating oil 4 stored at the bottom of the sealed container 1 is pulled up by the rotation of the crankshaft 8 by the viscous pump action of the oil pump 8 c attached to the lower end of the crankshaft 8. Then, it is guided upward through a spiral groove 8d formed on the outer periphery of the main shaft 8a, and is fixedly fitted to the piston 7 from the large end bearing portion of the connecting rod 6 that is rotatably fitted to the eccentric shaft 8b through the small end bearing portion. The combined piston pin 9 is lubricated, and is injected from a lubricating oil radiation hole 8bb provided in a form that partially penetrates the balance weight 10 attached to the upper end of the eccentric shaft 8b, and finally the upper end of the eccentric shaft 8b. It is injected from the part around. The injected lubricating oil 4 hits the oil receiving portion 11, travels through the notch portion 12, and is supplied to the outer peripheral surface 20 of the piston 7.

［ピストン７］
図３（ａ）はピストン７の上面図、図３（ｂ）はピストン７の側面図、図４は溝２２の平面展開図である。 [Piston 7]
3A is a top view of the piston 7, FIG. 3B is a side view of the piston 7, and FIG. 4 is a developed plan view of the groove 22.

ピストン７には、ピストン７の側周を形成する外周面２０に、２つの環状溝２１、溝２２（２２ａ，２２ｂ）、段付き溝２３、横側面２４、トップ側面２５、及びスカート側面２６、が設けられている。また、ピストン７は、ボア内に面するピストン７のトップ面２７、クランク軸８側に面するスカート面２８、を有する。   The piston 7 includes two annular grooves 21, grooves 22 (22 a and 22 b), a stepped groove 23, a lateral side surface 24, a top side surface 25, and a skirt side surface 26 on the outer peripheral surface 20 that forms the side periphery of the piston 7. Is provided. Further, the piston 7 has a top surface 27 of the piston 7 facing in the bore and a skirt surface 28 facing the crankshaft 8 side.

＜環状溝２１＞
環状溝２１は、外周面２０の周方向１周に亘って設けられた溝であり、ピストン７のトップ側面２５側に設けられている。本実施形態では環状溝２１を２つ設けているが、１つでもよいし３つ以上でも良い。 <Annular groove 21>
The annular groove 21 is a groove provided over the circumference of the outer peripheral surface 20 in the circumferential direction, and is provided on the top side surface 25 side of the piston 7. In the present embodiment, two annular grooves 21 are provided, but one or three or more may be used.

＜溝２２＞
溝２２としては、ピストン７の上側面に設けられた上面溝２２ａと、下側面に設けられた下面溝２２ｂとを有する。上面溝２２ａ及び下面溝２２ｂの形状は互いに同一にできるので、下面溝２２ｂとしての説明は繰り返さない。上面溝２２ａ及び下面溝２２ｂは、横側面２４を介して周方向に互いに離間している。 <Groove 22>
The grooves 22 include an upper surface groove 22a provided on the upper side surface of the piston 7 and a lower surface groove 22b provided on the lower side surface. Since the shape of the upper surface groove 22a and the lower surface groove 22b can be the same, the description of the lower surface groove 22b will not be repeated. The upper surface groove 22 a and the lower surface groove 22 b are separated from each other in the circumferential direction via the lateral side surface 24.

上面溝２２ａは、ピストン７の上面視において、境界（上死点側境界２２１ａ、下死点側境界２２３ａ、第１連結境界２２２ａ、及び第２連結境界２２４ａ）に囲まれた領域であり、外周面２０に設けられた凹部である。上面溝２２ａ及び下面溝２２ｂそれぞれの領域内には、ピストン７の側面を径方向に貫通する孔９０が設けられており、孔９０には筒状、例えば円筒状のピストンピン９が嵌合して固定されている。   The upper surface groove 22a is a region surrounded by boundaries (a top dead center side boundary 221a, a bottom dead center side boundary 223a, a first connection boundary 222a, and a second connection boundary 224a) in the top view of the piston 7. It is a recess provided in the surface 20. A hole 90 that penetrates the side surface of the piston 7 in the radial direction is provided in each region of the upper surface groove 22a and the lower surface groove 22b, and a cylindrical, for example, cylindrical piston pin 9 is fitted into the hole 90. Is fixed.

上死点側境界２２１ａは、上面溝２２ａのうち最もトップ面２７側に位置しており、環状溝２１よりスカート面２８側に位置している。上死点側境界２２１ａは、ピストン７の周方向に沿って設けられており、外周面２０を平面展開したときには略直線状である。この長さは、ピストンピン９が設けられた孔９０の寸法を、平面展開した外周面２０に投影した際の周方向寸法以上の長さである。   The top dead center side boundary 221a is located closest to the top surface 27 of the upper surface groove 22a, and is located closer to the skirt surface 28 than the annular groove 21. The top dead center side boundary 221a is provided along the circumferential direction of the piston 7, and is substantially linear when the outer peripheral surface 20 is developed in a plane. This length is equal to or longer than the circumferential dimension when the dimension of the hole 90 provided with the piston pin 9 is projected onto the outer peripheral surface 20 developed in a plane.

下死点側境界２２３ａは、上面溝２２ａのうち最もスカート面２８側に位置している。下死点側境界２２３ａは、ピストン７の周方向に沿って設けられており、外周面２０を平面展開したときには略直線状である。この長さは、孔９０の寸法を、平面展開した外周面２０に投影した際の周方向寸法以上の長さである。また、平面展開時における上死点側境界２２１ａ及び下死点側境界２２３ａの長さは略同一にできる。   The bottom dead center side boundary 223a is located closest to the skirt surface 28 in the upper surface groove 22a. The bottom dead center side boundary 223a is provided along the circumferential direction of the piston 7, and is substantially linear when the outer peripheral surface 20 is flattened. This length is equal to or longer than the circumferential dimension when the dimension of the hole 90 is projected onto the outer circumferential surface 20 developed in a plane. Further, the length of the top dead center side boundary 221a and the bottom dead center side boundary 223a at the time of flat development can be made substantially the same.

第１連結境界２２２ａは、上死点側境界２２１ａの一端及び下死点側境界線２２３ａの一端を連結するように位置している。第１連結境界２２２ａはピストン７の往復方向に対して平行な直線部２２２ａ１を持つ。直線部２２２ａ１の長さは、第１連結境界２２２ａの全長にしても良いし、本実施形態のように一部の長さにしても良い。第１連結境界２２２ａの一部の長さにする場合は、第１連結境界２２２ａの軸方向寸法の中点を含むようにすると、潤滑油４を上面溝２２ａに保持し易くなるので好ましい。また、第１連結境界２２２ａの一部の長さにする場合は、第１連結境界２２２ａは第２連結境界２２４ａから離れる方向に凸な形状にできる。   The 1st connection boundary 222a is located so that the end of the top dead center side boundary 221a and the end of the bottom dead center side boundary line 223a may be connected. The first connection boundary 222 a has a straight portion 222 a 1 parallel to the reciprocating direction of the piston 7. The length of the straight line portion 222a1 may be the entire length of the first connection boundary 222a, or may be a partial length as in the present embodiment. When making the length of a part of the first connection boundary 222a, it is preferable to include the midpoint of the axial dimension of the first connection boundary 222a because the lubricating oil 4 can be easily held in the upper surface groove 22a. Further, when the length of a part of the first connection boundary 222a is set, the first connection boundary 222a can be convex in a direction away from the second connection boundary 224a.

第２連結境界２２４ａは、上死点側境界２２１ａの他端及び下死点側境界線２２３ａの他端を連結するように位置している。第２連結境界２２４ａは、第１連結境界２２２ａと同様にピストン７の往復方向に対して平行な直線部２２４ａ１を持つ。直線部２２４ａ１の長さは、第２連結境界２２４ａの全長にしても良いし、本実施形態のように一部の長さにしても良い。第２連結境界２２４ａの一部の長さにする場合は、第２連結境界２２４ａの軸方向寸法の中点を含むようにすると、潤滑油４を上面溝２２ａに保持し易くなるので好ましい。また、第２連結境界２２４ａの一部の長さにする場合は、第２連結境界２２４ａは第１連結境界２２２ａから離れる方向に凸な形状にできる。なお、第１連結境界２２２ａ及び第２連結境界２２４ａの長さは、互いに略同一にできる。   The second connection boundary 224a is located so as to connect the other end of the top dead center side boundary 221a and the other end of the bottom dead center side boundary line 223a. The second connection boundary 224a has a straight portion 224a1 parallel to the reciprocating direction of the piston 7 like the first connection boundary 222a. The length of the straight portion 224a1 may be the entire length of the second connection boundary 224a, or may be a part of the length as in the present embodiment. When making the length of a part of the second connection boundary 224a, it is preferable to include the midpoint of the axial dimension of the second connection boundary 224a because the lubricating oil 4 can be easily held in the upper surface groove 22a. Further, when the length of a part of the second connection boundary 224a is set, the second connection boundary 224a can be formed in a convex shape in a direction away from the first connection boundary 222a. The lengths of the first connection boundary 222a and the second connection boundary 224a can be made substantially the same.

上死点側境界２２１ａ、第１連結境界２２２ａ、下死点側境界２２３ａ、及び第２連結境界２２４ａは、所定の曲率を有する丸角形状の接続部２９（第１接続部２２５ａ−第４接続部２２８ａ）によって接続している。   The top dead center side boundary 221a, the first connection boundary 222a, the bottom dead center side boundary 223a, and the second connection boundary 224a are round-corner connection portions 29 having a predetermined curvature (first connection portion 225a-fourth connection). Part 228a).

第１接続部２２５ａは、上死点側境界２２１ａの一端及び第１連結境界２２２ａの一端が接続する部分であり、ピストン７の上面視及び側面視で視認可能な位置に設けられている。   The first connection part 225a is a portion where one end of the top dead center side boundary 221a and one end of the first connection boundary 222a are connected, and is provided at a position where the piston 7 can be seen in a top view and a side view.

第２接続部２２６ａは、下死点側境界線２２３ａの一端及び第１連結境界２２２ａの他端が接続する部分であり、ピストン７の上面視及び側面視で視認可能な位置に設けられている。   The second connection portion 226a is a portion where one end of the bottom dead center side boundary line 223a and the other end of the first connection boundary 222a are connected, and is provided at a position where the piston 7 can be seen in a top view and a side view. .

第３接続部２２７ａは、下死点側境界線２２３ａの他端及び第２連結境界２２４ａの他端が接続する部分であり、ピストン７の上面視及び側面視で視認可能な位置に設けられている。   The third connection part 227a is a part to which the other end of the bottom dead center side boundary line 223a and the other end of the second connection boundary 224a are connected, and is provided at a position where the piston 7 can be seen in a top view and a side view. Yes.

第４接続部２２８ａは、上死点側境界２２１ａの他端及び第２連結境界２２４ａの一端が接続する部分であり、ピストン７の上面視及び側面視で視認可能な位置に設けられている。   The fourth connection portion 228a is a portion where the other end of the top dead center side boundary 221a and one end of the second connection boundary 224a are connected, and is provided at a position where the piston 7 can be seen in a top view and a side view.

接続部２９の１つ以上、好ましくは全部の曲率は、ピストンピン９の軸方向長さを直径とする円、好ましくは上死点側境界２２１ａ及び下死点側境界２２３ａの間の距離を直径とする円よりも曲率が大きい。接続部２９の曲率は、上面溝２２２ａの上死点側境界２２１ａ、第１連結境界２２２ａ、下死点側境界線２２３ａ、及び第２連結境界２２４ａの曲率より大きい。より好ましくは、接続部２９の曲率は、上死点側境界２２１ａ及び下死点側境界２２３ａの軸方向距離を直径とする円の曲率より大きい。   The curvature of one or more, preferably all of the connecting portions 29 is a circle whose diameter is the axial length of the piston pin 9, preferably the distance between the top dead center side boundary 221a and the bottom dead center side boundary 223a. The curvature is larger than the circle. The curvature of the connecting portion 29 is larger than the curvatures of the top dead center side boundary 221a, the first connection boundary 222a, the bottom dead center side boundary line 223a, and the second connection boundary 224a of the upper surface groove 222a. More preferably, the curvature of the connecting portion 29 is larger than the curvature of a circle whose diameter is the axial distance between the top dead center side boundary 221a and the bottom dead center side boundary 223a.

第１接続部２２５ａ及び第４接続部２２８ａの軸方向位置は、孔９０端部の軸方向位置よりもトップ面２７側に位置している。また、第２接続部２２６ａ及び第３接続部２２７ａの軸方向位置は、孔９０端部の軸方向位置よりもスカート面２８側に位置している。   The axial positions of the first connecting portion 225a and the fourth connecting portion 228a are located closer to the top surface 27 than the axial position of the end of the hole 90. The axial positions of the second connecting portion 226a and the third connecting portion 227a are located closer to the skirt surface 28 than the axial position of the end of the hole 90.

本実施形態の上面溝２２ａは、外周面２０を平面展開したときに略直方形状である。より具体的には、上死点側境界２２１ａ及び下死点側境界２２３ａは略直線状である。また、第１連結境界２２２ａ及び第２連結境界２２４ａは、全部が略直線状の直線部２２２ａ１，２２４ａ１、又は、一部が直線部２２２ａ１，２２４ａ１で、残部が上面溝２２ａの外側に向けて凸の曲線にできる。   The upper surface groove 22a of the present embodiment has a substantially rectangular shape when the outer peripheral surface 20 is flattened. More specifically, the top dead center side boundary 221a and the bottom dead center side boundary 223a are substantially linear. Further, the first connection boundary 222a and the second connection boundary 224a are all linear portions 222a1, 224a1 that are substantially linear, or part of the first connection boundary 222a and the second connection boundary 224a are convex toward the outside of the upper surface groove 22a. It can be a curve.

＜トップ側面２５＞
トップ側面２５はピストン７のトップ面２７と環状溝２１の間に設けられている。トップ側面２５はシリンダ５ａとの摺動面である。 <Top side 25>
The top side surface 25 is provided between the top surface 27 of the piston 7 and the annular groove 21. The top side surface 25 is a sliding surface with the cylinder 5a.

＜スカート側面２６＞
スカート側面２６はピストン７のスカート面２８と下死点側境界線２２３ａの間に設けられている。スカート側面２６はピストン７が下死点に位置するときに、シリンダ５ａ内から突出する構成となっている。 <Skirt side face 26>
The skirt side surface 26 is provided between the skirt surface 28 of the piston 7 and the bottom dead center side boundary line 223a. The skirt side surface 26 protrudes from the cylinder 5a when the piston 7 is located at the bottom dead center.

＜横側面２４＞
横側面２４はピストン７の上側面に設けられた上面溝２２ａ及び下側面に設けられた下側溝２２ｂとの間に設けられており、計２箇所に存在する。横側面２４は、ピストン７がシリンダ５ａに入るとき、ピストン７を案内する役割を果たす。 <Lateral side surface 24>
The lateral side surface 24 is provided between the upper surface groove 22a provided on the upper side surface of the piston 7 and the lower side groove 22b provided on the lower side surface, and is present in two places in total. The lateral surface 24 serves to guide the piston 7 when the piston 7 enters the cylinder 5a.

＜段付溝２３＞
段付き溝２３はピストン７のスカート側面２６とスカート面２８とのエッジに、ピストン７の外周面２０の周方向１周に亘って設けられたピストン外径よりも径の小さい溝である。段付溝２３は、スカート側面２６の潤滑油保持力を向上させることができる。また、ピストン７の外径研磨加工において、ローラー加工機がない場合においても、段付き溝２３をチャッキングして加工することができる。 <Stepped groove 23>
The stepped groove 23 is a groove having a diameter smaller than the outer diameter of the piston provided at the edge of the skirt side face 26 and the skirt face 28 of the piston 7 over the circumference of the outer peripheral face 20 of the piston 7 in the circumferential direction. The stepped groove 23 can improve the lubricating oil retaining force of the skirt side surface 26. Further, in the outer diameter polishing process of the piston 7, even when there is no roller processing machine, the stepped groove 23 can be chucked and processed.

［軸方向視の溝２２］
図５は図３（ｂ）のＢ−Ｂ線による軸方向視の断面図、図６はピストン７の斜視図である。ピストン７の往復方向（軸方向）について、第１連結境界２２２ａ及びピストン中心軸３０を結ぶ直線と、第２連結境界２２４ａ及びピストン中心軸３０を結ぶ直線とがなす角度のうち、上面溝２２ａに対向する角度３１ａは、下限が１２０°以上であることが好ましく、上限が１５０°以下であることが好ましい。 [Groove 22 as viewed in the axial direction]
FIG. 5 is a cross-sectional view taken along line BB in FIG. 3B and is a perspective view of the piston 7. About the reciprocating direction (axial direction) of the piston 7, the upper surface groove 22a has an angle formed between a straight line connecting the first connection boundary 222a and the piston central axis 30 and a straight line connecting the second connection boundary 224a and the piston central axis 30. The lower limit of the facing angle 31a is preferably 120 ° or more, and the upper limit is preferably 150 ° or less.

［密閉型圧縮機１００中でのピストン７の駆動］
図７は、ピストン７が下死点に位置するときの要部拡大断面図である。ピストン７より上方には、切欠き部１２が設けられている。切欠き部１２は、潤滑油放射孔８ｂｂから噴射された潤滑油４のうち、油受け部１１に落下して伝ったものを案内して、ピストン７の外周面２０に供給する。図２、図７に示すように、下死点において環状溝２１と上面溝２２ａとが切欠き部１２を介して露出するため、切欠き部１２を伝ってピストン７の外周面２０に供給された潤滑油４は、ピストン７が下死点に来た際に環状溝２１と上面溝２２ａへ供給される。また、本実施形態では、ピストン７が下死点に位置するときに、環状溝２１のうち最も下死点方向側に位置するものが、切欠き部１２の端面１２ａよりも上死点側に設けられている。これにより、切欠き部１２を伝う潤滑油４が環状溝２１に効果的に貯留され、ピストン７及びシリンダ５ａ間を潤滑できる。 [Driving of piston 7 in hermetic compressor 100]
FIG. 7 is an enlarged cross-sectional view of the main part when the piston 7 is located at the bottom dead center. A notch 12 is provided above the piston 7. The notch 12 guides the lubricating oil 4 injected from the lubricating oil radiation hole 8 bb and dropped to the oil receiver 11 and supplies it to the outer peripheral surface 20 of the piston 7. As shown in FIGS. 2 and 7, since the annular groove 21 and the upper surface groove 22 a are exposed through the notch 12 at the bottom dead center, they are supplied to the outer peripheral surface 20 of the piston 7 through the notch 12. The lubricating oil 4 is supplied to the annular groove 21 and the upper surface groove 22a when the piston 7 comes to the bottom dead center. Further, in the present embodiment, when the piston 7 is located at the bottom dead center, the annular groove 21 located closest to the bottom dead center side is closer to the top dead center than the end surface 12a of the notch 12. Is provided. Thereby, the lubricating oil 4 transmitted through the notch 12 is effectively stored in the annular groove 21, and the space between the piston 7 and the cylinder 5a can be lubricated.

また、上述したように、上面溝２２ａと下面溝２２ｂとは、孔９０により連通している。孔９０を伝って、上面溝２２ａに供給された潤滑油４は下面溝２２ｂにも供給される。供給された潤滑油４はピストン７の往復運動によりピストン７とシリンダ５ａとの間に供給され、潤滑およびシールが主に行われる。上面溝２２ａ及び下面溝２２ｂは外周面２０で囲まれているため、供給された潤滑油４を必要以上に外周面２０側に流出することなく保持することができる。   Further, as described above, the upper surface groove 22a and the lower surface groove 22b communicate with each other through the hole 90. The lubricating oil 4 supplied to the upper surface groove 22a through the hole 90 is also supplied to the lower surface groove 22b. The supplied lubricating oil 4 is supplied between the piston 7 and the cylinder 5a by the reciprocating motion of the piston 7, and is mainly lubricated and sealed. Since the upper surface groove 22a and the lower surface groove 22b are surrounded by the outer peripheral surface 20, the supplied lubricating oil 4 can be held without flowing out to the outer peripheral surface 20 more than necessary.

［効果］
本実施形態のピストン７は、上述した構成の上面溝２２ａ及び上面溝２２ａと同様の形状にできる下面溝２２ｂを有する。これにより、上面溝２２ａについては、以下の効果を奏することができる。 [effect]
The piston 7 of the present embodiment has the upper surface groove 22a and the lower surface groove 22b that can be formed in the same shape as the above-described structure. Thereby, about the upper surface groove | channel 22a, there can exist the following effects.

（１）第１連結境界２２２ａ及び第２連結境界２２４ａは、ピストン７の往復動方向（軸方向）に対して略平行な直線部２２２ａ１，２２４ａ１を有する。さらに、第１連結境界２２２ａ及び第２連結境界２２４ａの軸方向長さは、孔９０の軸方向長さ以上である。これにより、上面溝２２ａに供給された潤滑油４は、孔９０全域に流れやすくなり、かつ、第１連結境界２２２ａや第２連結境界２２４ａ近傍に供給された潤滑油４は、第１連結境界２２２ａや第２連結境界２２４ａに略均一に広がる。略均一に広げるためには、直線部２２２ａ１，２２４ａ１が、第１連結境界２２２ａや第２連結境界２２４ａの全長に亘って設けられていても良いし、直線部２２２ａ１，２２４ａ１が一部に亘って設けられ、かつ第１連結境界２２２ａや第２連結境界２２４ａが凸となっていても良いが、ピストン７の往復動に伴い、潤滑油４は上面溝２２ａの上死点側端部や下死点側端部である上死点側境界２２１ａや下死点側境界２２３ａ近傍に集まりやすいため、一部かつ残部が凸となる曲線にして軸方向中央側にも適度に集まるようにすると好ましい。したがって、上面溝２２ａ内の領域に略均一に潤滑油４を広げることができるので、潤滑油４は、第１連結境界２２２ａや第２連結境界２２４ａを均一に乗り越えて外周面２０（横側面２４）に供給される。   (1) The first connection boundary 222a and the second connection boundary 224a have linear portions 222a1 and 224a1 that are substantially parallel to the reciprocating direction (axial direction) of the piston 7. Further, the axial lengths of the first connection boundary 222 a and the second connection boundary 224 a are equal to or longer than the axial length of the hole 90. Thereby, the lubricating oil 4 supplied to the upper surface groove 22a can easily flow through the entire hole 90, and the lubricating oil 4 supplied in the vicinity of the first connection boundary 222a and the second connection boundary 224a 222a and the second connection boundary 224a are spread almost uniformly. In order to spread substantially uniformly, the straight portions 222a1 and 224a1 may be provided over the entire length of the first connection boundary 222a and the second connection boundary 224a, or the straight portions 222a1 and 224a1 may partially extend. The first connecting boundary 222a and the second connecting boundary 224a may be convex, but as the piston 7 reciprocates, the lubricating oil 4 is added to the top dead center side end of the upper surface groove 22a or the bottom dead center. Since it tends to gather in the vicinity of the top dead center side boundary 221a and the bottom dead center side boundary 223a, which are the point side ends, it is preferable to make a part of the curve and the remaining part convex so as to gather moderately on the central side in the axial direction. Accordingly, since the lubricating oil 4 can be spread substantially uniformly in the region in the upper surface groove 22a, the lubricating oil 4 can evenly get over the first connecting boundary 222a and the second connecting boundary 224a and the outer peripheral surface 20 (the lateral surface 24). ).

（２）上死点側境界２２１ａ及び下死点側境界２２３ａは周方向に略平行である。これにより、ピストン７の往復動によって潤滑油４が軸方向への力を受けて移動して、上死点側境界２２１ａ又は下死点側境界２２３ａ近傍に供給されると、潤滑油４は上死点側境界２２１ａや下死点側境界２２３ａに略均一に広がる。したがって、潤滑油４は、上死点側境界２２１ａや下死点側境界２２３ａを均一に乗り越えて外周面２０に供給される。   (2) The top dead center side boundary 221a and the bottom dead center side boundary 223a are substantially parallel to the circumferential direction. As a result, when the lubricating oil 4 is moved in response to the axial force by the reciprocating motion of the piston 7 and is supplied to the vicinity of the top dead center side boundary 221a or the bottom dead center side boundary 223a, the lubricating oil 4 is It spreads substantially uniformly on the dead center side boundary 221a and the bottom dead center side boundary 223a. Therefore, the lubricant 4 is supplied to the outer peripheral surface 20 evenly over the top dead center side boundary 221a and the bottom dead center side boundary 223a.

（３）第１連結境界２２２ａや第２連結境界２２４ａの軸方向長さは、孔９０の軸方向長さより大きく、上死点側境界２２１ａ及び下死点側境界線２２３ａが互いに略平行である。これにより、上面溝２２ａの周方向全域に亘って潤滑油４を均一に保持し易くなり、また、上面溝２２ａの面積を確保することでピストンピン９への潤滑油４の供給量を大きくすることができる。   (3) The axial lengths of the first connection boundary 222a and the second connection boundary 224a are larger than the axial length of the hole 90, and the top dead center side boundary 221a and the bottom dead center side boundary line 223a are substantially parallel to each other. . Thereby, it becomes easy to hold the lubricating oil 4 uniformly over the entire circumferential direction of the upper surface groove 22a, and the supply amount of the lubricating oil 4 to the piston pin 9 is increased by securing the area of the upper surface groove 22a. be able to.

（４）上面溝２２ａは、丸角の略長方形状であり、接続部２９の曲率の下限は、上述のとおりである。これにより、上面溝２２ａの面積を確保し易くなる。また、この下限値以上に曲率を大きくすることで、上面溝２２ａの面積を確保できるため、潤滑油の供給量の増大、摺動面積の低減による摩擦損失の低減が可能になる。一方、上面溝２２ａの角を略直角にせず丸角とすることで、供給された潤滑油４は、上面溝２２ａの角に滞ることなく、上面溝２２ａの境界のエッジへ均一に保持される。   (4) The upper surface groove 22a has a substantially rectangular shape with round corners, and the lower limit of the curvature of the connecting portion 29 is as described above. Thereby, it becomes easy to ensure the area of the upper surface groove 22a. Further, since the area of the upper surface groove 22a can be ensured by increasing the curvature beyond this lower limit value, it is possible to increase the amount of lubricating oil supplied and reduce friction loss by reducing the sliding area. On the other hand, by making the corner of the upper surface groove 22a a round corner instead of a substantially right angle, the supplied lubricating oil 4 is uniformly held at the edge of the upper surface groove 22a without stagnation at the corner of the upper surface groove 22a. .

（５）角度３１ａの適切な範囲は上述の通りである。角度３１ａを１２０°未満とすると、上面溝２２ａに保持された潤滑油４が横側面２０に行き渡りにくくなる。角度３１ａを１５０°以上とすると、横側面２４の面積が小さくなり、ピストン７の往復運動において挙動が安定しなくなる。角度３１ａの上限値は、下面溝２２ｂの角度３１ｂとの和を考慮して定めることもできる。例えば、角度３１ａと角度３１ｂとの和が３００°以下であることが好ましい。   (5) An appropriate range of the angle 31a is as described above. When the angle 31a is less than 120 °, the lubricating oil 4 held in the upper surface groove 22a is difficult to reach the lateral surface 20. When the angle 31a is 150 ° or more, the area of the lateral surface 24 becomes small, and the behavior becomes unstable in the reciprocating motion of the piston 7. The upper limit value of the angle 31a can be determined in consideration of the sum with the angle 31b of the lower surface groove 22b. For example, the sum of the angle 31a and the angle 31b is preferably 300 ° or less.

なお、上述の通り下面溝２２ｂの各構成要素は、上面溝２２ａの各構成要素と同様にできるため、下面溝２２ｂも上記と同様の効果を奏することができる。ピストン７は、上面溝２２ａのみ有しても良いし、下面溝２２ｂのみを有しても良いし、これらの両方を有していても良い。   In addition, since each component of the lower surface groove 22b can be made similar to each component of the upper surface groove 22a as described above, the lower surface groove 22b can also achieve the same effect as described above. The piston 7 may have only the upper surface groove 22a, only the lower surface groove 22b, or both of them.

［密閉型圧縮機を搭載した機器］
図８は、密閉型圧縮機１００を搭載した機器の一例である冷蔵庫２００の断面図である。冷蔵庫２００は、密閉型圧縮機１００、凝縮器（不図示）、減圧部（不図示）及び蒸発器２０１を含む冷凍サイクルを有している。冷媒を密閉型圧縮機１００で圧縮して高温高圧にし、凝縮器で放熱させ、さらに減圧部で圧力を低下させて蒸発器２０１で蒸発させることで冷気を得ることができる。
密閉型圧縮機１００を搭載する機器は、冷蔵庫２００に限られず、空調機等種々の機器に適用可能である。 [Equipment with hermetic compressor]
FIG. 8 is a cross-sectional view of a refrigerator 200 that is an example of a device on which the hermetic compressor 100 is mounted. The refrigerator 200 has a refrigeration cycle including a hermetic compressor 100, a condenser (not shown), a decompression unit (not shown), and an evaporator 201. Cold air can be obtained by compressing the refrigerant with the hermetic compressor 100 to high temperature and high pressure, dissipating heat with the condenser, lowering the pressure with the decompression unit, and evaporating with the evaporator 201.
The device on which the hermetic compressor 100 is mounted is not limited to the refrigerator 200, and can be applied to various devices such as an air conditioner.

１…密閉容器、２…電動要素、２ａ…ステータ、２ｂ…ロータ、３…圧縮要素、４…潤滑油、５…シリンダブロック、５ａ…シリンダ、５ｂ…フレーム部、５ｃ…軸受部、６…コンロッド、７…ピストン、８…クランク軸、８ａ…主軸、８ｂ…偏心軸、８c…オイルポンプ、８ｂａ…給油溝、８ｂｂ…潤滑油放射孔、８ｃ…オイルポンプ、８ｄ…スパイラル溝、９…ピストンピン、１０…バランスウエイト、１１…油受け部、１２…切欠き部、１２ａ…切欠き円弧端面、２０…外周面、２１…環状溝、２２ａ…上面溝、２２ｂ…下面溝、９０…孔、２２１ａ（２２１ｂ）…上死点側境界、２２２ａ（２２２ｂ）…第１連結境界、２２３ａ（２２３ｂ）…下死点側境界線、２２４ａ（２２４ｂ）…第２連結境界、２２５ａ（２２５ｂ）…第１接続部、２２６ａ（２２６ｂ）…第２接続部、２２７ａ（２２７ｂ）…第３接続部、２２８ａ（２２８ｂ）…第４接続部、２３…段付き溝、２４…横側面、２５…トップ側面、２６…スカート側面、２７…トップ面、２８…スカート面、２９…接続部、３０…円筒中心軸、３１ａ（３１ｂ）…角度、１００…密閉型圧縮機、２００…冷蔵庫   DESCRIPTION OF SYMBOLS 1 ... Sealed container, 2 ... Electric element, 2a ... Stator, 2b ... Rotor, 3 ... Compression element, 4 ... Lubricating oil, 5 ... Cylinder block, 5a ... Cylinder, 5b ... Frame part, 5c ... Bearing part, 6 ... Connecting rod , 7 ... piston, 8 ... crankshaft, 8a ... main shaft, 8b ... eccentric shaft, 8c ... oil pump, 8ba ... oil supply groove, 8bb ... lubricating oil radiation hole, 8c ... oil pump, 8d ... spiral groove, 9 ... piston pin DESCRIPTION OF SYMBOLS 10 ... Balance weight, 11 ... Oil receiving part, 12 ... Notch part, 12a ... Notch circular arc end surface, 20 ... Outer peripheral surface, 21 ... Circular groove, 22a ... Upper surface groove, 22b ... Lower surface groove, 90 ... Hole, 221a (221b): Top dead center side boundary, 222a (222b): First connection boundary, 223a (223b): Bottom dead center side boundary line, 224a (224b): Second connection boundary, 225a (225b): First connection Part, 226a (226b) ... second connection part, 227a (227b) ... third connection part, 228a (228b) ... fourth connection part, 23 ... stepped groove, 24 ... lateral side, 25 ... top side, 26 ... Skirt side surface, 27 ... Top surface, 28 ... Skirt surface, 29 ... Connection part, 30 ... Cylindrical central axis, 31a (31b) ... Angle, 100 ... Hermetic compressor, 200 ... Refrigerator

Claims (5)

軸方向に沿って上死点側及び下死点側を往復動するピストンを備え、
該ピストンは、ピストンピンが設けられた孔を囲む溝を有する密閉型圧縮機であって、
前記溝は、
前記孔より上死点側に位置し、周方向に沿って設けられた上死点側境界と、
前記孔より下死点側に位置し、周方向に沿って設けられた下死点側境界と、
前記上死点側境界の一端側及び前記下死点側境界の一端側を結ぶ第１連結境界と、
前記上死点側境界の他端側及び前記下死点側境界の他端側を結ぶ第２連結境界と、を備え、
前記第１連結境界及び／又は前記第２連結境界の軸方向長さは、前記孔の軸方向長さ以上であり、
前記第１連結境界及び／又は前記第２連結境界は、軸方向に略平行な直線部を有することを特徴とする密閉型圧縮機。 A piston that reciprocates on the top dead center side and the bottom dead center side along the axial direction,
The piston is a hermetic compressor having a groove surrounding a hole provided with a piston pin,
The groove is
Located at the top dead center side from the hole, the top dead center side boundary provided along the circumferential direction,
Located at the bottom dead center side from the hole, the bottom dead center side boundary provided along the circumferential direction,
A first connection boundary connecting one end side of the top dead center side boundary and one end side of the bottom dead center side boundary;
A second connection boundary connecting the other end side of the top dead center side boundary and the other end side of the bottom dead center side boundary, and
The axial length of the first connection boundary and / or the second connection boundary is not less than the axial length of the hole,
The hermetic compressor, wherein the first connection boundary and / or the second connection boundary has a linear portion substantially parallel to the axial direction. 前記第１連結境界及び前記第２連結境界の軸方向長さは、前記孔の軸方向長さ以上であり、
前記第１連結境界及び前記第２連結境界は、軸方向に略平行な直線部を有し、
前記第１連結境界は、前記第２連結境界から離れる方向に凸であり、
前記第２連結境界は、前記第１連結境界から離れる方向に凸であることを特徴とする請求項１に記載の密閉型圧縮機。 The axial lengths of the first connection boundary and the second connection boundary are not less than the axial length of the hole,
The first connection boundary and the second connection boundary have straight portions substantially parallel to the axial direction,
The first connection boundary is convex in a direction away from the second connection boundary;
The hermetic compressor according to claim 1, wherein the second connection boundary is convex in a direction away from the first connection boundary. 前記溝は、略長方形状であり、
前記上死点側境界の一端及び前記第１連結境界を接続する第１接続部と、
前記第１接続部の他端及び前記下死点側境界の一端を接続する第２接続部と、
前記下死点側境界の他端及び前記第２連結境界の他端を接続する第３接続部と、
前記第２連結境界の一端及び前記上死点側境界の他端を接続する第４接続部と、
を有し、
前記第１接続部、前記第２接続部、前記第３接続部及び前記第４接続部の曲率は、前記上死点側境界、前記第１連結境界、前記下死点側境界、及び前記第２連結境界の曲率より大きく、
前記上死点側境界及び前記下死点側境界は、略平行であることを特徴とする請求項１又は２に記載の密閉型圧縮機。 The groove has a substantially rectangular shape,
A first connection portion connecting one end of the top dead center side boundary and the first connection boundary;
A second connection portion for connecting the other end of the first connection portion and one end of the bottom dead center side boundary;
A third connection portion connecting the other end of the bottom dead center side boundary and the other end of the second connection boundary;
A fourth connecting portion for connecting one end of the second connection boundary and the other end of the top dead center side boundary;
Have
The curvatures of the first connection part, the second connection part, the third connection part, and the fourth connection part are the top dead center side boundary, the first connection boundary, the bottom dead center side boundary, and the first connection part. Greater than the curvature of the two connected boundaries,
The hermetic compressor according to claim 1, wherein the top dead center side boundary and the bottom dead center side boundary are substantially parallel. 前記ピストンを軸方向で観察した場合に、前記ピストンの中心及び前記上死点側境界を通過する直線と、前記ピストンの中心及び前記下死点側境界を通過する直線と、が成し、前記溝に対向する角が、１２０°以上であることを特徴とする請求項１乃至３何れか一項に記載の密閉型圧縮機。   When the piston is observed in the axial direction, a straight line passing through the center of the piston and the top dead center side boundary and a straight line passing through the center of the piston and the bottom dead center side boundary are formed, The hermetic compressor according to any one of claims 1 to 3, wherein an angle facing the groove is 120 ° or more. 請求項１乃至４何れか一項に記載の密閉型圧縮機を備えた機器。   The apparatus provided with the hermetic compressor as described in any one of Claims 1 thru | or 4.
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