JP2007298012A - Hermetic compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem that in conventional methods, increase in the number of man-hours and increase in component cost to improve dimension accuracy are required, and to provide a method for preventing lift of an upper shell and a lower shell at the time of circumference welding at low cost without increasing the number of man-hours as much as possible. <P>SOLUTION: In this hermetic compressor, insertion portions of the upper shell 101 and the lower shell 102 into a cylindrical shell 103 are fitted with interference, and have a structure elastically deformable by stress at the time of insertion. Thus, lift of the upper shell 101 and the lower shell 102 at the time of circumference welding can be prevented at low cost without increasing the number of man-hours as much as possible. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、業務用または家庭用、あるいは乗り物用の冷凍空調装置、ヒートポンプ式給湯器、あるいは冷蔵庫などに用いられる密閉型圧縮機に関するものである。   The present invention relates to a hermetic compressor for use in a refrigeration and air-conditioning apparatus, a heat pump water heater, a refrigerator, or the like for business use, household use, or vehicle use.

密閉型圧縮機は、図１に示すように、上シェル１０１と下シェル１０２及び円筒シェル１０３から成る密閉容器１内に圧縮機構２、この圧縮機構２の下方若しくは上方に設けた圧縮機構２を駆動するための電動機３と、この電動機３の回転力を圧縮機構２に伝達するためのクランク軸４とを備え、密閉容器１内の下部に設けたオイル溜め２０のオイル６を、クランク軸４を通じてクランク軸４の軸受部６６や圧縮機構２の摺動部に供給する給油機構７とを備えている。   As shown in FIG. 1, the hermetic compressor includes a compression mechanism 2 in a hermetic container 1 composed of an upper shell 101, a lower shell 102, and a cylindrical shell 103, and a compression mechanism 2 provided below or above the compression mechanism 2. An electric motor 3 for driving and a crankshaft 4 for transmitting the rotational force of the electric motor 3 to the compression mechanism 2, and the oil 6 of the oil sump 20 provided at the lower part in the hermetic container 1 are replaced with the crankshaft 4 And an oil supply mechanism 7 for supplying the bearing portion 66 of the crankshaft 4 to the sliding portion of the compression mechanism 2.

この種の密閉型圧縮機における密閉容器の組立方法に於いて、従来、上シェル１０１及び下シェル１０２を円筒シェル１０３に円周溶接する際に溶接時の熱により、１０１、下シェル１０２及び円筒シェル１０３が熱変形を起こし浮きが生じたり、上シェル１０１及び下シェル１０２を円筒シェル１０３に挿入する際、挿入部の公差により隙間が生じる場合があり、搬送中に落下したりする恐れがあった。   In a method for assembling a sealed container in this type of hermetic compressor, conventionally, when the upper shell 101 and the lower shell 102 are circumferentially welded to the cylindrical shell 103, the heat generated during welding causes the 101, the lower shell 102, and the cylinder to be welded. When the shell 103 is thermally deformed and floats, or when the upper shell 101 and the lower shell 102 are inserted into the cylindrical shell 103, there may be a gap due to the tolerance of the insertion portion, and the shell 103 may fall during conveyance. It was.

これらを解消する為に、従来では上シェル１０１及び下シェル１０３をイナート溶接等で円筒シェル１０３へ仮止めしたり、圧入固定をしたりしていた（例えば、特許文献１参照）。
特開平１１−２８０６７０号公報 In order to solve these problems, conventionally, the upper shell 101 and the lower shell 103 are temporarily fixed to the cylindrical shell 103 by inert welding or the like, or press-fitted and fixed (for example, see Patent Document 1).
JP 11-280670 A

しかし、従来の工法では工数が増大したり、寸法精度を向上させる為に部品コスト増加していたりした。   However, in the conventional method, the number of man-hours has increased, and the cost of parts has increased in order to improve the dimensional accuracy.

本発明の目的は、安価でかつ工数を極力増加させることなく円周溶接時の上シェル及び下シェルの浮きを防止出来る方法を提供することにある。   An object of the present invention is to provide a method that is inexpensive and can prevent the upper shell and the lower shell from floating during circumferential welding without increasing man-hours as much as possible.

本発明の密閉型圧縮機は、密閉容器内に圧縮機構と、この圧縮機構の下方若しくは上方に設けた圧縮機構を駆動するための電動機と、この電動機の回転力を圧縮機構部に伝達するためのクランク軸と、密閉容器内の下部に設けたオイル溜めのオイルを、クランク軸を通じてクランク軸の軸受部や圧縮機構摺動部に供給する給油機構とを備えたことを基本構成とする密閉型圧縮機に関するものである。前記の目的を達成するために、図１の密閉型圧縮機の上シェル及び下シェルの形状を、挿入部を締め代にしかつ挿入時の応力により弾性変形可能な構造にすることにより、安価でかつ工数を極力増やすことなく、円周溶接時の上シェル及び下シェルの浮きを防止出来る。   The hermetic compressor of the present invention includes a compression mechanism in a hermetic container, an electric motor for driving a compression mechanism provided below or above the compression mechanism, and a rotational force of the electric motor for transmitting to the compression mechanism unit. A sealed type that basically includes a crankshaft and an oil supply mechanism that supplies oil in an oil reservoir provided in the lower part of the sealed container to the bearing portion of the crankshaft and the sliding portion of the compression mechanism through the crankshaft. It relates to a compressor. In order to achieve the above-described object, the shape of the upper shell and the lower shell of the hermetic compressor of FIG. 1 is reduced by using a structure that allows the insertion portion to be tightened and can be elastically deformed by the stress at the time of insertion. In addition, it is possible to prevent the upper shell and the lower shell from floating during circumferential welding without increasing the man-hours as much as possible.

本発明の特徴は、以下の詳細な説明及び図面によって明らかになる。本発明の特徴は、可能な限りにおいて、それ単独で、あるいは種々な組み合わせで複合して用いることができる。   The features of the present invention will become apparent from the following detailed description and drawings. The features of the present invention can be used alone or in combination in various combinations as much as possible.

本発明によれば、前記の説明で明らかなように、円筒シェル１０３に上シェル１０１及
び下シェル１０２を溶接する際に、上シェル１０１及び下シェル１０２の挿入部を締め代にしかつ挿入時の応力により弾性変形可能な構造にすることにより搬送中の落下を防げ、円周溶接する際の浮きも防ぐことが出来る。 According to the present invention, as is apparent from the above description, when the upper shell 101 and the lower shell 102 are welded to the cylindrical shell 103, the insertion portions of the upper shell 101 and the lower shell 102 are used as a tightening allowance and at the time of insertion. By adopting a structure that can be elastically deformed by stress, falling during conveyance can be prevented, and floating during circumferential welding can also be prevented.

更に、上シェル１０１及び下シェル１０２の円筒シェル１０３への挿入部は締め代だが加工精度はそれほど求める必要はなく、安価に目的が達成出来る。   Further, although the insertion portions of the upper shell 101 and the lower shell 102 into the cylindrical shell 103 are tightening allowances, the processing accuracy is not required so much and the object can be achieved at low cost.

また、請求項２の場合、図２に示すように上シェル１０１及び下シェル１０３の挿入部の板厚ｔ１を円筒シェルの板厚ｔ２よりも小さくすることにより、締め代部分が弾性変形可能な構造となり、請求項１と同等の効果を得られる。   Further, in the case of claim 2, as shown in FIG. 2, the fastening portion can be elastically deformed by making the thickness t1 of the insertion portion of the upper shell 101 and the lower shell 103 smaller than the thickness t2 of the cylindrical shell. The structure is obtained, and an effect equivalent to that of the first aspect can be obtained.

また、請求項３は請求項２において、図４に示すように上シェル１０１及び下シェル１０３の挿入部の板厚ｔ１と円筒シェルの板厚ｔ２が０．１≦ｔ２／ｔ１≦０．６となるようにすることにより、圧入不可になることもなく、圧入後の保持力不足による円周溶接時の浮きや搬送時の落下することがない最適な板厚に設定できる。   According to a third aspect of the present invention, in the second aspect, as shown in FIG. 4, the plate thickness t1 of the insertion portion of the upper shell 101 and the lower shell 103 and the plate thickness t2 of the cylindrical shell are 0.1 ≦ t2 / t1 ≦ 0.6. By doing so, it is possible to set the optimum plate thickness so as not to prevent press-fitting, and to prevent floating during circumferential welding due to insufficient holding force after press-fitting and dropping during conveyance.

以下、本発明における実施の形態に係る密閉型圧縮機および組立方法について図面を参照しながら説明し、本発明の理解に供する。   Hereinafter, a hermetic compressor and an assembling method according to an embodiment of the present invention will be described with reference to the drawings for understanding of the present invention.

（実施の形態１）
本実施の形態は縦型のスクロール式圧縮機構を内蔵した密閉型圧縮機の場合の一例であり、圧縮対象は冷媒ガスである。しかし、本発明はこれに限られることはなく、ロータリ式の圧縮機構など各種の圧縮機構、それを駆動する電動機とともに密閉容器内に内蔵したガス一般を対象として圧縮し、圧縮機構が密閉容器内を上下に仕切り、その下部に電動機を収容する密閉型圧縮機であればその全般に適用して有効であり、本発明の範疇に属する。 (Embodiment 1)
The present embodiment is an example of a hermetic compressor incorporating a vertical scroll compression mechanism, and the compression target is a refrigerant gas. However, the present invention is not limited to this, and various types of compression mechanisms such as a rotary compression mechanism, as well as the gas built in the sealed container together with the electric motor that drives the compression mechanism, are compressed. A hermetic compressor that divides the upper and lower parts and accommodates an electric motor in the lower part is effective when applied to all of them and belongs to the category of the present invention.

本実施の形態の密閉型圧縮機は図１に示すように、密閉容器１内に溶接や焼き嵌めなどして固定したクランク軸４の主軸受部材１１と、この主軸受部材１１上にボルト止めした固定スクロール１２との間に、固定スクロール１２と噛み合う旋回スクロール１３を挟み込んでスクロール式の圧縮機構２を構成し、旋回スクロール１３と主軸受部材１１との間に旋回スクロール１３の自転を防止して円軌道運動するように案内するオルダムリングなどによる自転規制機構１４を設けて、クランク軸４の上端にある主軸部４ａにて旋回スクロール１３を偏心駆動することにより旋回スクロール１３を円軌道運動させ、これにより固定スクロール１２と旋回スクロール１３との間に形成している圧縮室１５が外周側から中央部に移動しながら小さくなるのを利用して、密閉容器１外に通じた吸入パイプ１６および固定スクロール１２の外周部の吸入口１７から冷媒ガス２７を吸入して圧縮していき所定圧以上になった冷媒ガスは固定スクロール１２の中央部の吐出口１８からリード弁１９を押し開いて密閉容器１内に吐出させることを繰り返す。   As shown in FIG. 1, the hermetic compressor according to the present embodiment includes a main bearing member 11 of a crankshaft 4 fixed by welding or shrink fitting in the hermetic container 1, and bolts on the main bearing member 11. The scroll type compression mechanism 2 is configured by sandwiching the orbiting scroll 13 meshing with the fixed scroll 12 between the fixed scroll 12 and the rotation of the orbiting scroll 13 between the orbiting scroll 13 and the main bearing member 11. A rotation restricting mechanism 14 such as an Oldham ring that guides the circular scroll to move is provided, and the orbiting scroll 13 is eccentrically driven by the main shaft portion 4a at the upper end of the crankshaft 4, thereby causing the orbiting scroll 13 to move circularly. As a result, the compression chamber 15 formed between the fixed scroll 12 and the orbiting scroll 13 becomes smaller while moving from the outer peripheral side to the center portion. , The refrigerant gas 27 is sucked from the suction pipe 16 communicating with the outside of the hermetic container 1 and the suction port 17 on the outer peripheral portion of the fixed scroll 12 and compressed, and the refrigerant gas that exceeds the predetermined pressure is fixed to the fixed scroll. The reed valve 19 is pushed open from the discharge port 18 at the center of 12 and discharged into the sealed container 1 repeatedly.

次に組立方法について図１を用いて説明する。   Next, the assembly method will be described with reference to FIG.

前記構成のスクロール圧縮機を組み立てる場合、旋回スクロール１３を旋回自在に収容した状態で、固定スクロール１２と主軸受部材１１とを複数のボルトで組み付けて圧縮機構２を構成するとともに、クランク軸４に回転子３ａを焼きばめする一方、密閉容器１の円筒シェル１０３に前記固定子３ｂを焼き嵌めする。   When assembling the scroll compressor having the above-described configuration, the fixed scroll 12 and the main bearing member 11 are assembled with a plurality of bolts in a state in which the orbiting scroll 13 is rotatably accommodated, and the compression mechanism 2 is configured. While the rotor 3a is shrink-fitted, the stator 3b is shrink-fitted into the cylindrical shell 103 of the sealed container 1.

次に、副軸受２１を保持した軸受部品２８を円筒シェル１０３に溶接固定した後、回転子３ａが焼き嵌めされたクランク軸４を圧縮機構２と一体的に固定子３ｂに組み込み、円
筒シェル１０３に穿設された複数の開口部（図示せず）を介して軸受部品２８を円筒シェル１０３に溶接固定する。その後、円筒シェル１０３に上シェル１０１，下シェル１０２を円周溶接するのだが、図２に示すように上シェル１０１及び下シェル１０２挿入部の板厚を薄くすることにより、円筒シェル１０３への挿入部を締め代にしかつ弾性変形可能な構造にすることにより搬送中の落下を防げ、更に円周溶接する際の浮きも防ぐことが出来る。 Next, after the bearing part 28 holding the auxiliary bearing 21 is welded and fixed to the cylindrical shell 103, the crankshaft 4 on which the rotor 3 a is shrink-fitted is integrated into the stator 3 b integrally with the compression mechanism 2. The bearing part 28 is welded and fixed to the cylindrical shell 103 through a plurality of openings (not shown) drilled in the cylindrical shell 103. Thereafter, the upper shell 101 and the lower shell 102 are circumferentially welded to the cylindrical shell 103. As shown in FIG. 2, by reducing the plate thickness of the upper shell 101 and the lower shell 102 insertion portion, By adopting a structure that allows the insertion portion to be tightened and elastically deformed, dropping during conveyance can be prevented, and floating during circumferential welding can also be prevented.

以上のように本発明にかかる密閉型圧縮機は、安価でかつ工数を極力増加させることなく円周溶接時の上シェル及び下シェルの浮きを防止出来るので、業務用または家庭用、あるいは乗り物用の冷凍空調装置、ヒートポンプ式給湯器、あるいは冷蔵庫などに用いられる密閉型圧縮機に適用することができる。   As described above, the hermetic compressor according to the present invention is inexpensive and can prevent floating of the upper shell and the lower shell at the time of circumferential welding without increasing the man-hours as much as possible. It can be applied to a hermetic compressor used in a refrigeration air conditioner, a heat pump type hot water heater, a refrigerator, or the like.

本発明の実施の形態に係る１つの密閉型圧縮機を示す断面図Sectional drawing which shows one closed type compressor which concerns on embodiment of this invention 本発明の実施の形態に係る１つの密閉容器の拡大断面図The expanded sectional view of one airtight container concerning an embodiment of the invention 従来の密閉型圧縮機を示す断面図Sectional view showing a conventional hermetic compressor ｔ２／ｔ１の最適値範囲を示すグラフGraph showing the optimum range of t2 / t1

符号の説明Explanation of symbols

１ 密閉容器
２ 圧縮機構
３ 電動機
３ａ 回転子
３ｂ 固定子
４ クランク軸
７ 給油機構
１１ 主軸受部材
１２ 固定スクロール
１３ 旋回スクロール
１４ 自転規制機構
１５ 圧縮室
１６ 吸入パイプ
１７ 吸入口
１８ 吐出口
１９ リード線
２０ オイル溜め
２１ 副軸受
２２ ピン
２３、２４ バランスウエイト
２５ ポンプ
２６ オイル供給穴
２７ 冷媒ガス
３１ 容器内吐出室
３２ 圧縮機構連通路
３３ 回転子上部室
３４ 連絡路
３５ 回転子下部室
３６ 回転子通路
３７ 固定子通路
３８ 固定子上部室
３９ 外部吐出パイプ
６６ 軸受部
１００ マフラー
１０１ 上シェル
１０２ 下シェル
１０３ 円筒シェル
DESCRIPTION OF SYMBOLS 1 Airtight container 2 Compression mechanism 3 Electric motor 3a Rotor 3b Stator 4 Crankshaft 7 Oil supply mechanism 11 Main bearing member 12 Fixed scroll 13 Orbiting scroll 14 Rotation restriction mechanism 15 Compression chamber 16 Suction pipe 17 Suction port 18 Ejection port 19 Lead wire 20 Oil sump 21 Sub bearing 22 Pin 23, 24 Balance weight 25 Pump 26 Oil supply hole 27 Refrigerant gas
31 Discharge chamber in container 32 Compression mechanism communication path 33 Rotor upper chamber 34 Communication path 35 Rotor lower chamber 36 Rotor passage 37 Stator passage 38 Stator upper chamber 39 External discharge pipe 66 Bearing portion 100 Muffler 101 Upper shell 102 Lower Shell 103 Cylindrical shell

Claims (4)

円筒シェルの一方の端部に上シェル、もう一方の端部に下シェルを挿入配置し、挿入部外周を円周溶接してなる密閉容器を有する密閉型圧縮機であって、前記シェル間の挿入部は締め代を有する嵌め合いとなっており、かつ挿入時の応力により弾性変形可能な構造であることを特徴とする密閉型圧縮機。 A hermetic compressor having a hermetic container in which an upper shell is inserted at one end of a cylindrical shell and a lower shell is inserted at the other end, and the outer periphery of the insert is circumferentially welded. A hermetic compressor, wherein the insertion portion is a fitting having a tightening allowance, and has a structure that can be elastically deformed by a stress at the time of insertion. 上シェル及び下シェルの挿入部板厚が円筒シェルの挿入部板厚よりも小さいことを特徴とする請求項１記載の密閉型圧縮機。 2. The hermetic compressor according to claim 1, wherein the thicknesses of the insertion portions of the upper shell and the lower shell are smaller than the thickness of the insertion portion of the cylindrical shell. 上シェル及び下シェルの挿入部板厚が円筒シェルの挿入部板厚に対して０．１〜０．６倍であることを特徴とする請求項２記載の密閉型圧縮機。 3. The hermetic compressor according to claim 2, wherein the thickness of the insertion portion of the upper shell and the lower shell is 0.1 to 0.6 times the thickness of the insertion portion of the cylindrical shell. 圧縮される冷媒が二酸化炭素である請求項１乃至３記載の密閉型圧縮機。
The hermetic compressor according to any one of claims 1 to 3, wherein the refrigerant to be compressed is carbon dioxide.

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