JPH0588168U - Fully enclosed electric motor for driving ammonia refrigerant compressor - Google Patents

Abstract

(57)【要約】 【目的】 アンモニア冷媒の圧縮機１を駆動する電動機
２に対して、軸受部５に特別な封止機構を施さず、アン
モニア雰囲気の腐食性、導電性、吸湿性に耐えるよう
に、電動機の固定子巻線８に絶縁処理を施し、端末端末
をアンモニア雰囲気に曝される分岐、集合する接続点を
排して、フレーム３外へ密封貫通端子１３を介して導出
したアンモニア冷媒圧縮機駆動用全密閉型電動機。 【構成】 固定子巻線８の心線導体１０の外面に被覆し
た架橋ポリエチレン樹脂による第１の絶縁層１１の上
に、更にポリアミド樹脂による第２の絶縁層１２を施す
とともに、巻線端末の外被体１００外への導出に、フレ
ーム３に穿設した密封貫通端子１３を介して行う。 (57) [Abstract] [Purpose] With respect to the electric motor 2 that drives the compressor 1 for ammonia refrigerant, the bearing 5 does not have a special sealing mechanism and can withstand the corrosiveness, conductivity, and hygroscopicity of the ammonia atmosphere. As described above, the stator winding 8 of the electric motor is subjected to an insulation treatment, the terminal points where the terminal ends are exposed to the ammonia atmosphere, branching and gathering connection points are eliminated, and the ammonia is led out to the outside of the frame 3 through the sealed through terminal 13. A fully enclosed electric motor for driving a refrigerant compressor. [Structure] A second insulating layer 12 made of polyamide resin is further provided on a first insulating layer 11 made of a crosslinked polyethylene resin coated on the outer surface of the core conductor 10 of the stator winding 8, and The lead-out to the outside of the outer casing 100 is performed via the sealed through terminal 13 formed in the frame 3.

Description

【考案の詳細な説明】[Detailed description of the device]

【０００１】[0001]

【産業上の利用分野】[Industrial applications]

本考案は、アンモニアを冷媒とする圧縮機の駆動軸に動力を伝達するために、 一体化され全閉構造とした電動機の絶縁に関し、圧縮機からのアンモニアガスの 漏洩を阻止する特別な軸封機構を備えしめず、装置全体の設計を容易化するとと もにアンモニアガス雰囲気の曝露に対して十分な絶縁性と耐久性を備えしめたア ンモニア冷媒圧縮機駆動用全密閉型電動機を提供するにある。 The present invention relates to the insulation of an electric motor, which is integrated and has a fully closed structure in order to transmit power to the drive shaft of a compressor using ammonia as a refrigerant, and a special shaft seal that prevents leakage of ammonia gas from the compressor. To provide a fully enclosed electric motor for driving an ammonia refrigerant compressor that does not have a mechanism, facilitates the design of the entire device, and has sufficient insulation and durability against exposure to an ammonia gas atmosphere. It is in.

【０００２】[0002]

【従来の技術】[Prior Art]

従来、冷媒を圧縮する圧縮機自体の駆動軸には、冷媒の漏洩を阻止するために 、摺動型軸封装置が一般に採用されてきているが、冷媒としてアンモニアを用い るとき、潤滑油に対してアンモニアは極く微量しか溶解しないものの、その具有 する臭気が甚だしくしかも毒性があり、腐触性、導電性、吸湿性といった属性と も相まって、上記摺動型軸封部の摺動面での油切れや、摩耗に基因して微量なが らも軸封部から漏洩することは回避しなければならない。 Conventionally, a sliding shaft seal device has been generally used for the drive shaft of the compressor itself that compresses the refrigerant in order to prevent leakage of the refrigerant. On the other hand, ammonia dissolves only in a very small amount, but its odor is extremely severe and toxic, and in combination with attributes such as corrosion, conductivity, and hygroscopicity, the sliding surface of the sliding shaft seal part It is necessary to avoid leakage of oil from the shaft and leakage from the shaft seal even if it is a trace amount due to wear.

【０００３】 他方、従来のフレオン（米国カイネテイック・ケミカル社の登録商標）を冷媒 とする場合には、冷媒自体が高い絶縁性を呈し、耐用性の高い電気絶縁被覆を施 した絶縁電線により電動機の固定子巻線を巻装すれば、耐フレオン性のハーメチ ック構造として圧縮機を駆動する全密閉型のフレオン冷媒圧縮装置とすることが できた。しかしながら近時、化学的に安定なフレオン自体が地球環境に与える影 響からその使用が困難になりつつある現況下では、今後専らアンモニアを冷媒と する圧縮機が主流になると考えられる。On the other hand, when conventional Freon (registered trademark of Kineatic Chemical Company, USA) is used as a refrigerant, the refrigerant itself exhibits high insulation properties, and an insulated wire with a highly durable electrical insulation coating is used to drive an electric motor. If the stator windings were wound, it was possible to obtain a freon-resistant hermetic structure that was a hermetically sealed freon refrigerant compressor that drives the compressor. However, under the present circumstances where the use of chemically stable Freon itself is becoming difficult due to the influence on the global environment, it is considered that compressors using ammonia as the refrigerant will become the mainstream in the future.

【０００４】 又、電動機の固定子巻線に従来の絶縁電線を用いたのでは、アンモニアを冷媒 とする圧縮機の駆動用電動機としては、耐アンモニア性が得られず、そのために ハーメチック型式の開発が行われず、固定子巻線を大気側に配置し、回転子部分 を密封したキャンドモータが注目されるに及んでいるが、このキャンによる損失 とこれに伴う冷却の点で、低い効率しか得られず、大容量の電動機の設計を著し く困難にしてきた。Further, if a conventional insulated wire is used for the stator winding of the electric motor, ammonia resistance cannot be obtained as an electric motor for driving a compressor using ammonia as a refrigerant, and therefore a hermetic type is developed. However, a canned motor in which the stator winding is placed on the atmosphere side and the rotor part is sealed has come to the forefront, but only low efficiency is obtained in terms of the loss due to this can and the cooling associated therewith. This has made the design of large-capacity motors extremely difficult.

【０００５】[0005]

【考案が解決しようとする課題】[Problems to be solved by the device]

しかして本考案は、アンモニアを冷媒として用いる完全無漏洩型圧縮機におい て、キャンド型電動機及び従来のハーメチック型電動機とは全く構想を異にして 、アンモニア冷媒圧縮機と一体化して、これを駆動する電動機を全密閉型とする ことにあって、アンモニア雰囲気に曝されようとも電動機の固定子巻線として、 特に電気的絶縁性の劣化が抑制され、しかも巻線加工の容易な巻線用耐アンモニ ア絶縁電線を使用し、該絶縁電線の接続部分を全面的に排することで全密封構造 とすることを可能とし、大容量密封型電動機の設計を容易化する道を開かんとす るものである。 The present invention, however, is a completely leak-free compressor that uses ammonia as a refrigerant, and has a completely different concept from the canned motor and the conventional hermetic motor, and is integrated with the ammonia refrigerant compressor to drive it. Since the motor to be used is a fully enclosed type, it is used as a stator winding of the motor even when it is exposed to an ammonia atmosphere. Ammonia insulated electric wire is used, and by completely eliminating the connected part of the insulated electric wire, it is possible to create a fully sealed structure, opening the way to facilitate the design of large capacity sealed electric motors. It is a thing.

【０００６】[0006]

【課題を解決するための手段】[Means for Solving the Problems]

従って本考案にあっては、アンモニア雰囲気に対する電動機の電気的絶縁性に 着目し、電気的入力の印加される固定子巻線（ステータ・コイル）として、心線 導体上に直接、架橋ポリエチレンによる可撓性の大なるしかもピンホールの僅少 な第１の絶縁層を被覆し、更にその上に強度補正のための摩擦係数の小なるポリ アミド樹脂例えばナイロン（Ｄｕ Ｐｏｎｔ社の登録商標）による第２の絶縁層 を被覆してなる絶縁電線を使用し、アンモニアガスに曝される電動機のフレーム 内での巻線の接続部分に問題のある分岐点や集合点を、全く排除することを特徴 とするものである。 Therefore, in the present invention, paying attention to the electric insulation of the electric motor against the ammonia atmosphere, a stator winding (stator coil) to which an electric input is applied can be directly formed on the core conductor by using cross-linked polyethylene. A first insulating layer having a large flexibility and a small number of pinholes is coated, and a polyamide resin having a small friction coefficient for strength correction, such as nylon (a registered trademark of Du Pont), is formed on the second insulating layer. It is characterized by using insulated wires covered with the insulation layer of the above, and completely eliminating the branching point and the gathering point which have a problem in the connection part of the winding in the frame of the motor exposed to ammonia gas. It is a thing.

【０００７】 又、好ましくは上記固定子巻線の夫々の端末が、電動機フレームに穿設した密 封貫通端子を介して外被体外へ導出されるようにし、冷媒雰囲気であるアンモニ アによって絶縁劣化をもたらさない構成としている。[0007] Preferably, each end of the stator winding is led out to the outside of the outer casing through a sealed through terminal provided in the motor frame, and insulation deterioration is caused by an ammonia as a refrigerant atmosphere. It does not bring about.

【０００８】[0008]

【作用】[Action]

上記のように構成された全密閉型電動機にすることによって、アンモニア冷媒 圧縮機を駆動するために一体化することが可能となり、大容量電動機の設計を容 易にし得て、アンモニア冷媒による産業用圧縮機に資するものである。 The fully enclosed electric motor configured as described above can be integrated to drive the ammonia refrigerant compressor, which can facilitate the design of a large capacity electric motor and can be used for industrial use with the ammonia refrigerant. It contributes to the compressor.

【０００９】[0009]

【実施例】【Example】

以下、図面を参照して本考案の好適な一実施例を例示的に詳しく説明する。但 しこの実施例に記載されている構成部品の寸法、材質、形状、その相対配置とは 、特に特定的な記載がない限りは、この考案の範囲をそれのみに限定する趣旨で はなく、単なる説明例に過ぎない。 Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the drawings. However, the dimensions, materials, shapes, and relative arrangements of the components described in this embodiment are not intended to limit the scope of the present invention thereto unless otherwise specified. It is just an example of explanation.

【００１０】 先ず図１は本考案の実施例としてのアンモニア圧縮装置の一部破断側面図で、 １はアンモニア用圧縮機、２は耐アンモニア全密閉型電動機で上記圧縮機１と駆 動軸４を介して直結し一体化されている。そして全体が外被体１００によって覆 われている。上記駆動軸４を支承する軸受部５には特に軸封装置などを具備せず 、上記冷媒であるアンモニアは、上記軸受部５その他を介して連通されているこ とになるので両者が一体構造になっている。６は上記駆動軸に嵌着された回転子 であり、７は固定子鉄心で圧力容器となるフレーム３に嵌入されており、固定子 巻線８がこれに巻装されている。この固定子巻線８は前記の通りアンモニア用圧 縮機１と一体構造をなすために、圧縮機１側のアンモニアガス、潤滑油などの雰 囲気に曝されることになる。８１は固定子巻線の端末部、５１、５２は上記回転 駆動軸の軸受部で、５１は上記アンモニア冷媒圧縮機側で回転軸を、特に封止機 構なしに支承し、５２は上記回転駆動軸を他端でブラケット９により支承してい る。６は導体バーを軸長方向の溝に埋設してなる円筒状の回転子（ロータ）であ る。First, FIG. 1 is a partially cutaway side view of an ammonia compressor according to an embodiment of the present invention, in which 1 is a compressor for ammonia, and 2 is an ammonia-resistant fully enclosed electric motor, and the compressor 1 and a drive shaft 4 are shown. It is directly connected through and integrated. The entire body is covered with the outer cover 100. The bearing portion 5 supporting the drive shaft 4 is not provided with a shaft sealing device or the like, and ammonia as the refrigerant is communicated through the bearing portion 5 and the like, so that both are integrally structured. It has become. Reference numeral 6 is a rotor fitted to the drive shaft, 7 is a stator iron core, which is fitted into a frame 3 which serves as a pressure vessel, and a stator winding 8 is wound around this. Since the stator winding 8 has an integral structure with the ammonia compressor 1 as described above, it is exposed to the atmosphere such as ammonia gas and lubricating oil on the compressor 1 side. Reference numeral 81 is a terminal portion of the stator winding, 51 and 52 are bearing portions of the rotary drive shaft, 51 is a bearing of the rotary shaft on the side of the ammonia refrigerant compressor, particularly without a sealing mechanism, and 52 is the rotary shaft. The drive shaft is supported at the other end by a bracket 9. Reference numeral 6 is a cylindrical rotor (rotor) in which a conductor bar is embedded in a groove in the axial direction.

【００１１】 上記固定子巻線８は、要部斜視外観を表した図２のように耐アンモニア性の架 橋ポリエチレンによる第１の絶縁層１１を心線導体１０の外周全面に被覆すると ともに、巻線成形作業と固定子鉄心７の線輪溝への装着作業時に生じる損傷を防 ぐために、更にこの第１の絶縁層１１の外表面に少なくとも数ミクロンの厚さの ポリアミド樹脂による第２の絶縁層１２を被覆して絶縁電線としている。The stator winding 8 has a first insulating layer 11 made of ammonia-resistant bridge polyethylene covering the entire outer circumference of the core conductor 10 as shown in FIG. In order to prevent damage that may occur during the winding work and the work of mounting the stator core 7 in the ring groove, the outer surface of the first insulating layer 11 is further covered with a second insulating layer of polyamide resin having a thickness of at least several microns. The layer 12 is covered to form an insulated wire.

【００１２】 図３は三相誘導電動機に前記絶縁処理を施した固定子巻線８が、デルタ結線（ Ａ）、スター結線（Ｂ）、相分離結線（Ｃ）とした場合の、巻線端末又は接続部 が密封貫通端子１３を介してフレーム３の外方へ導出する実施態様を表している 。フレーム３内で３相の固定子巻線８が同図（Ａ）では接続点Ｃ₁、Ｃ₂、Ｃ₃にお いて夫々三又分岐接続され、同図（Ｂ）では、Ｃ₄に接続点を有していて夫々分 岐点や接続点を備えているので導線の接続には全く問題はないが上記架橋ポリエ チレン電線に更にポリアミド樹脂の被覆を施した絶縁電線では全くピンホールの 無い完全な絶縁処理が難しく、その上、長年の使用により上記接続部に劣化を生 じて絶縁不良を起こしやすくなるものである。そこで同図（Ｃ）のように、相分 離型の固定子巻線とすることによって完全に接続点、分岐点が無くなり、巻線の 端末を密封貫通端子１３から外方へ引出す耐アンモニアガス強化策を施した構造 にすることが出来た。FIG. 3 is a winding terminal in the case where the stator winding 8 obtained by subjecting the three-phase induction motor to the insulation treatment has a delta connection (A), a star connection (B), and a phase separation connection (C). Alternatively, it represents an embodiment in which the connecting portion is led out to the outside of the frame 3 via the sealed through terminal 13. In the frame (3), three-phase stator windings (8) are connected at _three connection points C ₁ , C ₂ , and C ₃ in a three-branch connection, and in the same figure (B), connected to C ₄ . Since there is a point and each has a branch point and a connection point, there is no problem in connecting the conductor wire, but the insulated wire in which the cross-linked polyethylene wire is further coated with polyamide resin has no pinholes. It is difficult to completely insulate the insulation, and moreover, it is prone to deterioration of the above-mentioned connection part and poor insulation due to long-term use. Therefore, as shown in Fig. 7C, by using a phase-separated type stator winding, the connection points and branch points are completely eliminated and the end of the winding is pulled out from the sealed through terminal 13 to the outside of the ammonia resistant gas. The structure could be strengthened.

【００１３】 従って図３（Ｃ）のように固定子巻線に耐アンモニア性をもたせるだけでなく 、フレーム内にアンモニアガスに曝露される導体、分岐点や接続部が皆無となっ て、巻線端末が密封されるので、充分な耐アンモニア冷媒対策をほどこした電動 機とすることができるとともに、起動電流を抑制し得るような結線に際してフレ ーム外でアンモニア雰囲気とは無関係に容易に結線を行うのにも極めて好都合で ある。Therefore, as shown in FIG. 3 (C), not only does the stator winding have ammonia resistance, but there are no conductors, branch points, or connection parts exposed to ammonia gas in the frame, Since the terminal is sealed, it is possible to provide a motor with sufficient measures against ammonia refrigerant, and at the time of connection that can suppress the starting current, easily connect it outside the frame regardless of the ammonia atmosphere. It's also very convenient to do.

【００１４】[0014]

【考案の効果】[Effect of the device]

かくして本考案によれば、耐アンモニア絶縁電線による固定子巻線を備え、且 つ分岐又は集合した接続点を皆無とし、巻線端末を密封貫通端子から外方へ導出 することができる構造の電動機によって、アンモニア用圧縮機を駆動するように 一体化したために、従来の回転子と固定子との間の空隙にキャンを嵌装したキャ ンドモータにおけるキャン損失やこれにより生じる冷却効率の低下といった障害 は全く払拭され、結局アンモニアの腐食性や絶縁劣化を招来する雰囲気に曝され ても、電動機の固定子巻線の心線導体にピンホールの少ない可撓性に富んだ架橋 ポリエチレン樹脂と、摩擦係数の小なる強度補正に適したポリアミド樹脂層とを もって被覆した絶縁電線を用いているので、巻線加工が容易に行え、更に分岐や 集合する接続点を皆無として、巻線端末を電動機のフレームに穿設した密封貫通 端子を介して外部へ導出し得る耐アンモニア性電動機とすることができるので、 圧縮機を電動機と一体構造とする際に問題となった絶縁、冷却等一切の障害が取 除かれ、フレオン冷媒による圧縮機に一体化した全閉電動機の性能に匹敵する特 性を得ることができるほか、密閉型大容量電動機に対しても適用し得て、その設 計を容易化し産業用の圧縮装置に対して寄与するところが大きい。 Thus, according to the present invention, a motor having a stator winding with an ammonia resistant insulated wire and having no branching or gathering connection points and being capable of leading the winding terminal outward from the sealed through terminal Due to the integration of the ammonia compressor to drive it, there are no problems such as can loss in the conventional canned motor with a can fitted in the gap between the rotor and the stator and the resulting reduction in cooling efficiency. Even if it is completely wiped out and exposed to an atmosphere that eventually causes corrosiveness of ammonia and deterioration of insulation, the core conductor of the stator winding of the motor has a flexible cross-linked polyethylene resin with few pinholes and a friction coefficient. Insulated wires covered with a polyamide resin layer suitable for strength correction are used, so winding work can be performed easily, and connection points for branching and gathering Since there is nothing, the winding terminal can be an ammonia-resistant electric motor that can be led out to the outside through the sealed penetration terminal that is drilled in the electric motor frame, which is a problem when the compressor is integrated with the electric motor. In addition, the insulation, cooling, and other obstacles have been eliminated, and it is possible to obtain characteristics comparable to the performance of a fully-closed electric motor integrated with a compressor using Freon refrigerant, and also applied to a hermetically sealed large-capacity electric motor. In particular, it greatly facilitates the design and contributes to the industrial compression device.

【図面の簡単な説明】[Brief description of drawings]

【図１】本考案を実施したアンモニア冷媒圧縮装置の一
部破断側面図。FIG. 1 is a partially cutaway side view of an ammonia refrigerant compression device embodying the present invention.

【図２】固定子巻線の心線導体に本考案の絶縁被覆を施
した要部斜視外観図。FIG. 2 is a perspective external view of a main part in which the core wire conductor of the stator winding is subjected to the insulating coating of the present invention.

【図３】本考案を三相電動機に適用して固定子巻線をデ
ルタ結線（Ａ）、スター結線（Ｂ）、相分離型結線
（Ｃ）を夫々、密封貫通端子を介して外部へ導出する態
様図。[Fig. 3] Applying the present invention to a three-phase electric motor, the stator winding is led out to the outside through a sealed through terminal, each of a delta connection (A), a star connection (B), and a phase separation type connection (C). FIG.

【符号の説明】[Explanation of symbols]

１ アンモニア用圧縮機 ２ 全密閉型電動機 ３ フレーム ４ 回転駆動軸 ５ 軸受部 ６ 回転子 ７ 固定子鉄心 ８ 固定子巻線 ９ ブラケット １０ 固定子巻線の心線導体 １１ 第１の絶縁層 １２ 第２の絶縁層 １３ 密封貫通端子 １００ 外被体 Ｃ₁〜Ｃ₄ 分岐接続点1 Ammonia compressor 2 Fully enclosed electric motor 3 Frame 4 Rotation drive shaft 5 Bearing part 6 Rotor 7 Stator core 8 Stator winding 9 Bracket 10 Stator winding core conductor 11 First insulating layer 12 No. 2 of the insulating layer 13 sealed through terminal 100 envelope body C ₁ -C ₄ branch connection point

Claims (2)

【実用新案登録請求の範囲】[Scope of utility model registration request] 【請求項１】 アンモニア冷媒圧縮機と一体化された駆
動用の全密閉型電動機において、該電動機の固定子巻線
がその心線導体上に施した架橋ポリエチレン樹脂による
第１の絶縁層と、該第１の絶縁層上にその外周全面をポ
リアミド樹脂により被覆した第２の絶縁層とを巻装した
絶縁電線よりなることを特徴とするアンモニア冷媒圧縮
機駆動用全密閉型電動機。1. A totally hermetic electric motor for driving, which is integrated with an ammonia refrigerant compressor, wherein a stator winding of the electric motor has a first insulating layer made of a crosslinked polyethylene resin provided on its core conductor. A hermetically sealed electric motor for driving an ammonia refrigerant compressor, comprising an insulated electric wire comprising a first insulating layer and a second insulating layer whose outer peripheral surface is covered with a polyamide resin. 【請求項２】 前記固定子巻線の端末が、電動機フレー
ムに穿設した密封貫通端子を介して上記外被体外へ導出
されるように分岐又は集合した接続点を上記フレーム内
に露出せしめないことを特徴とする請求項１に記載のア
ンモニア冷媒圧縮機駆動用全密閉型電動機。2. A connecting point, which is branched or gathered so that the end of the stator winding is led out to the outside of the outer casing through a sealed through terminal formed in the motor frame, is not exposed in the frame. The fully enclosed electric motor for driving an ammonia refrigerant compressor according to claim 1.