JPH0281971A - Motor-driven compressor - Google Patents

Abstract

PURPOSE:To decrease the resonance of a core preventing a stator core from deteriorating its rigidity and an electromagnetic steel plate from its transverse displacement by providing a rib, extended almost parallelly with a sliding direction, in an end face of the stator core in a direction orthogonal with the sliding direction of a piston. CONSTITUTION:A rib 8 is provided parallelly extending with a sliding direction in both sides of an end face of a stator core 1 in a direction orthogonal with the sliding direction of a piston in a compressor part. Consequently, in the case of a compressor tightening by two bolts a frame structure 4 only to one side of the end face of the stator core 1, particularly a part weak in its strength, that is, a part with the stator core not tightened by the bolt is increased in the rigidity, and the core is increased in its natural vibration. While the transverse displacement of an electromagnetic steel plate is prevented, and the compressor is reduced in its vibration, preventing an improper start. Since the rib 8 can be easily molded simultaneously with press punch molding of the electromagnetic steel plate 2, the compressor is prevented from increasing work labor hours and/or causing the cost up.

Description

【発明の詳細な説明】 （イ）産業上の利用分野 本発明は冷蔵庫やショーケース等に使用される電動圧縮
機に関する。DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention relates to an electric compressor used in refrigerators, showcases, etc.

（ロ）従来の技術 ｉ；ｊＥ　木、この種の圧縮機は電磁鋼板を積層すると
共に外縁部の４ケ所にボルト挿通孔を有するステータコ
アと、このコアの端面に４本のボルトでボルト締めされ
ると共に圧縮機部を装着してなる枠体とを備えて構成さ
れている。(B) Conventional technology i; jE Wood: This type of compressor has a stator core made of laminated magnetic steel plates and has bolt insertion holes at four locations on the outer edge, and is bolted to the end face of this core with four bolts. and a frame body to which a compressor section is attached.

しかし、近年、圧縮機の小型化や軽量化が強く要望され
てきたことにより、本件出願人は特公昭６２−３０３１
１号公報で開示した如く、枠体を略三角状の小さなもの
としてその取付脚も２本だけとし、この枠体をステータ
コア端面における片側だけにボルト締めしたものを発明
した。However, in recent years, as there has been a strong demand for smaller and lighter compressors, the applicant has
As disclosed in Publication No. 1, the present inventors have invented a structure in which the frame is made into a small, approximately triangular piece with only two mounting legs, and the frame is bolted to only one side of the end face of the stator core.

（ハ）発明が解決しようとする課題 しかしながら、斯る構造に因るとステータコアのボルト
締付部所は２丙所であるため、コアの剛性低下べ・電磁
鋼板の横ズレを来招し易くコアの共振によって圧縮機の
振動が増大したり始動不良を起こすという問題があった
。(C) Problems to be Solved by the Invention However, with this structure, the stator core bolts are tightened at two locations, which reduces the rigidity of the core and tends to cause lateral displacement of the electromagnetic steel sheets. There have been problems in that core resonance increases the vibration of the compressor and causes startup failures.

このため、ステータコアのクランプ箇所を増やしたりワ
ニス処理等を施したりしてコアの固有振動数を上げ、コ
アが共振を防いでいたが、これらの方法は何れも作業工
数のアップやコスト高となるため改善が望まｔしていた
。For this reason, the natural frequency of the core has been increased by increasing the number of clamping points on the stator core or applying varnish treatment to prevent the core from resonating, but all of these methods increase the number of man-hours and cost. Therefore, improvements were desired.

本発明は斯る点に鑑み成されたものであり、作業工数の
アップやコスト高を招くことなくステータコアの剛性低
下や電磁鋼板の横ズレを防ぎ、コアの共振が少なく、振
動が小さく始動性の良い電動圧縮機を提供することを目
的とする。The present invention has been developed in view of these points, and prevents a decrease in the rigidity of the stator core and lateral displacement of the electromagnetic steel sheets without increasing the number of work hours or increasing costs, and provides low core resonance, low vibration, and easy start-up. The purpose is to provide a good electric compressor.

（ニ）課題を解決するための手段 本発明は、電磁鋼板を積層すると共に外縁部にボルト挿
通孔を有するステータコアと、このコアの端面における
片側だけに前記ボルト挿通孔を介してボルト締めされる
と共に圧縮機部を装着してなる枠体とを備えた電動圧縮
機において、前記圧縮機部のピストン摺動方向と直行す
る方向におけるステータコアの端面に、前記摺動方向と
略平行に延びるリブを設けたものである。(d) Means for Solving the Problems The present invention provides a stator core made of laminated electromagnetic steel sheets and having bolt insertion holes in the outer edge, and a stator core that is bolted to only one side of the end face of the core through the bolt insertion holes. In the electric compressor, the stator core is provided with a rib extending substantially parallel to the sliding direction on an end surface of the stator core in a direction perpendicular to the piston sliding direction of the compressor part. It was established.

（ホ）作用 本発明の電動圧縮機は上記の構成により、枠体をステー
タコア端面における片側だけにボルト締めした構成にお
いて特に弱かったステータコアのボルト締めされていな
い部分の剛性を高めコアの固有振動数を上げると共に電
磁鋼板の楢ズレを防止して、圧縮機の振動を低減したり
始動不良を防ぐことかできる１、また、このときリブは
電磁鋼板の打ち抜き成形と同時に簡ＩＪＬに成形できる
ため、作業工数を増加したりコスト高を招くようなこと
はない。(E) Function The electric compressor of the present invention has the above-mentioned structure, and increases the rigidity of the unbolted portion of the stator core, which is particularly weak in the structure in which the frame is bolted to only one side of the stator core end face, and increases the natural frequency of the core. At the same time, the ribs can be easily formed into IJL at the same time as the electromagnetic steel sheet is punched and formed. It does not increase the number of work hours or increase costs.

（へ）実施例 以下、本発明の実施（’Ａを図面に基ずいて説明する。(f) Example Hereinafter, implementation of the present invention ('A) will be explained based on the drawings.

１は複数枚の電磁鋼板２を積層してフック加締めにより
クランプすると共に外縁部の４＠所にボルト挿通孔３を
有するステータコアである。４は前記コアｌの上端面に
おける片側だけに前記ボルト挿通孔３を介して該枠体の
取付脚７に螺＆される２本のボルト５によりボルト締め
されると共に圧縮機部となるシリング６を装着してなる
枠体である。この枠体と前記ステータコア１とで構成さ
れる圧縮機本体は図示しない密閉ケースに収納されて密
閉型の電動圧縮機を形成する。Reference numeral 1 designates a stator core in which a plurality of electromagnetic steel plates 2 are laminated and clamped by hook caulking, and has bolt insertion holes 3 at 4 positions on the outer edge. Reference numeral 4 denotes a sill 6 which is bolted to only one side of the upper end surface of the core l by two bolts 5 which are screwed into the mounting leg 7 of the frame body through the bolt insertion hole 3, and which serves as a compressor part. It is a frame body that is equipped with. A compressor main body composed of this frame and the stator core 1 is housed in a closed case (not shown) to form a closed type electric compressor.

而して、８は前記ステータコア１に形成され、たｊブで
ある。このリブは前記圧縮機部のピストン摺動方向（第
１図、第２図中矢印で示す）と直行する方向におけるス
テータコア１の端面の両側に、前記摺動方向と平行に延
在されいている。8 is formed on the stator core 1 and is a tab. These ribs extend parallel to the sliding direction on both sides of the stator core 1 in a direction perpendicular to the piston sliding direction (indicated by arrows in FIGS. 1 and 2) of the compressor section. .

このように構成された電動圧縮機は、枠体４をステータ
コア１の端面における片側だけに２本のボルトでボルト
締めした圧縮機において、特にその強度が弱がった部分
、即ち、ステータコア１のボルト締めされていない部分
の剛性を高めてコアの固有振動数を上げると共に電磁鋼
板の横ズレを防止することができ、圧縮機の振動を低減
し、たり始動不良を防ぐことができる。すなわち、従来
、圧縮機の騒８のうち５００Ｈｚ付近の低周波音がなか
なか解消できずに問題となっており、モーダル解析試験
によりステータコアｌにこの５００Ｈ１の加振を行って
コアのｘ−ｙ−ｚの３軸方向の振動モードを解析すると
従来は第４図のようになっていたが、本実施例の場合に
は第５図の如く、ボルト締めされていない部分く第１．
４．５図中ポイント５，６，８．９）での振動モードが
減少していることが確認できた。なお、第１図、第２図
、及び第３図中、ポインｌ−２，３，ｌ　１．　１２が
ホルト締付けＮ所をしめｔ。　また、リブ８は電磁鋼板
２のプレス打ち抜き成形と同時に簡１且に成形できるた
め、作業工数を増加したリコスト高を招くようなことは
ない。The electric compressor constructed in this way is a compressor in which the frame body 4 is fastened with two bolts to only one side of the end face of the stator core 1, and the strength of the frame body 4 is particularly reduced in the part where the strength is weakened, that is, on one side of the stator core 1. It is possible to increase the rigidity of the parts that are not tightened with bolts, raise the natural frequency of the core, and prevent lateral displacement of the electromagnetic steel plate, reducing compressor vibration and preventing starting failures. In other words, in the past, low-frequency noise around 500 Hz among compressor noises has been a problem that cannot be easily eliminated, and a modal analysis test has been conducted to excite the stator core l by applying this 500 H1 vibration to the core's x-y- When the vibration modes in the three z-axis directions are analyzed, conventionally the results are as shown in FIG. 4, but in the case of this embodiment, as shown in FIG.
It was confirmed that the vibration modes at points 5, 6, and 8.9 in Figure 4.5 were reduced. Note that in FIGS. 1, 2, and 3, points 1-2, 3, and 1. 12 tightens the bolt at the N position. Furthermore, since the ribs 8 can be easily formed at the same time as the press punching of the electromagnetic steel sheet 2, there is no need to increase the number of man-hours and increase the cost of recycling.

（ト）発明の効果 以上のように本発明によれば、枠体がステータコア端面
における片側だけにボルト締めされた構成であっても作
業工数のアップやコスト高を招くことなくステータコア
の剛性を高め電磁鋼板の横ズレを防ぐことができ、５０
０Ｈｚ付近でのコアの」（振を低減して、振動が小さく
始動性の良い電動圧縮機を提供することができる。(G) Effects of the Invention As described above, according to the present invention, even if the frame body is bolted to only one side of the end face of the stator core, the rigidity of the stator core can be increased without increasing the number of work steps or increasing costs. Can prevent horizontal displacement of electromagnetic steel sheets,
It is possible to reduce the vibration of the core near 0 Hz and provide an electric compressor with low vibration and good startability.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明の圧縮機本体を示す斜視図である。第２
図は電磁鋼板の平面図、第３図は第２図のＡ−Ａセクシ
ョンにＪ）ける断面図、第４図は従来構成のモーダル解
析図、第５図は本発明のステータコアのモーダル解析図
である。 ｌ・・・ステータコア、２・−・電磁鋼板、３・・・ボ
ルト挿通孔、４・・枠体、５・・・ボルト、６・・・シ
リンダ、８　・・ ｊブ。FIG. 1 is a perspective view showing a compressor main body of the present invention. Second
The figure is a plan view of the electromagnetic steel plate, Figure 3 is a sectional view taken along section A-A in Figure 2, Figure 4 is a modal analysis diagram of the conventional configuration, and Figure 5 is a modal analysis diagram of the stator core of the present invention. It is. l... Stator core, 2... Electromagnetic steel plate, 3... Bolt insertion hole, 4... Frame body, 5... Bolt, 6... Cylinder, 8... jbu.

Claims (1)

【特許請求の範囲】[Claims] （１）電磁鋼板を積層すると共に外縁部にボルト挿通孔
を有するステータコアと、このコアの端面における片側
だけに前記ボルト挿通孔を介してボルト締めされると共
に圧縮機部を装着してなる枠体とを備えた電動圧縮機に
おいて、前記圧縮機部のピストン摺動方向と直行する方
向におけるステータコアの端面に、前記摺動方向と略平
行に延びるリブを設けたことを特徴とする電動圧縮機。(1) A frame body consisting of a stator core made of laminated electromagnetic steel sheets and having bolt insertion holes on the outer edge, and a compressor unit attached to only one side of the end face of the core that is bolted through the bolt insertion holes. An electric compressor comprising: a rib extending substantially parallel to the sliding direction of the stator core on an end surface of the stator core in a direction perpendicular to the sliding direction of the piston of the compressor section.