JP2013032704A

JP2013032704A - Refrigerant compressor

Info

Publication number: JP2013032704A
Application number: JP2011167791A
Authority: JP
Inventors: Naoya Morozumi; 尚哉両角
Original assignee: Fujitsu General Ltd
Current assignee: Fujitsu General Ltd
Priority date: 2011-07-29
Filing date: 2011-07-29
Publication date: 2013-02-14

Abstract

PROBLEM TO BE SOLVED: To obtain a refrigerant compressor capable of securing pressure resistance without increasing the thickness of a casing and capable of improving fatigue strength without increasing the thickness of a discharge pipe.SOLUTION: The refrigerant compressor includes: the casing 10 having an upper shell 10a; a power source terminal stand 115 airtightly fixed to a first through-hole 10b that is disposed on the upper shell; and the discharge pipe 107 which is inserted and joined to a second through-hole 10c disposed on the upper shell and discharges the refrigerant compressed by a refrigerant compression portion to the external part, wherein the discharge pipe 107 includes a diameter expansion part 108a arranged on an external part of the upper shell and a non-diameter expansion part 108b that is inserted to a second through-hole 10c of the upper shell and is arranged in the upper shell, and a step part 108c between the diameter expansion part 108a and the non-diameter expansion part 108b includes a steel pipe 108 joined to the upper shell and a copper pipe 109 that is inserted to the diameter expansion part 108a of the steel pipe 108 and is joined to the edge part of the diameter expansion part 108a.

Description

本発明は、冷凍装置や空気調和機等の冷凍サイクルに使用されるロータリ式の冷媒圧縮機に関する。 The present invention relates to a rotary type refrigerant compressor used in a refrigeration cycle such as a refrigeration apparatus or an air conditioner.

従来、密閉容器内に電動要素と圧縮要素とを備えて成る、密閉型圧縮機において、前記密閉容器から冷媒ガスを吐出するために備えられた吐出管を、前記密閉容器の上側を構成する上密閉容器の内側の内管と外側の外管で構成し、内管の材質を鋼材、外管の材質を銅材とし、内管の一方の開口部を拡管し、拡管された前記開口部に外管を挿入した状態で該開口部の先端部及び外管を前記上密閉容器にロー材で溶接固定した密閉型圧縮機が開示されている（例えば、特許文献１参照）。 Conventionally, in a hermetic compressor including an electric element and a compression element in a hermetic container, a discharge pipe provided for discharging refrigerant gas from the hermetic container constitutes an upper side of the hermetic container. Consists of an inner tube and an outer tube on the inside of the sealed container, the inner tube is made of steel, the outer tube is made of copper, and one opening of the inner tube is expanded. A hermetic compressor is disclosed in which the tip of the opening and the outer tube are welded and fixed to the upper hermetic container with a brazing material in a state where the outer tube is inserted (see, for example, Patent Document 1).

また、密閉容器内に電動要素と圧縮要素とを備えて成る密閉型圧縮機において、前記密閉容器から冷媒ガスを吐出するために備えられた吐出管を、前記密閉容器の上側を構成する上密閉容器の内側の内管と外側の外管で構成し、内管の材質を鋼材、外管の材質を銅材とし、内管の一方の開口部を拡管すると共に先端部を反り返り形状とし、拡管された前記開口部に外管を挿入した状態で前記先端部及び外管を前記上密閉容器にロー材で溶接固定した密閉型圧縮機が開示されている（例えば、特許文献２参照）。 Further, in the hermetic compressor including the electric element and the compression element in the hermetic container, a discharge pipe provided for discharging the refrigerant gas from the hermetic container has an upper hermetic seal that constitutes the upper side of the hermetic container. Consists of an inner tube on the inside of the container and an outer tube on the outside. The material of the inner tube is steel, the material of the outer tube is copper, and one end of the inner tube is expanded and the tip is warped to expand the tube. A hermetic compressor is disclosed in which the distal end and the outer tube are welded and fixed to the upper airtight container with a brazing material in a state where the outer tube is inserted into the opened opening (see, for example, Patent Document 2).

特開２０１０−０３８０８６号公報JP 2010-038086 A 特開２０１０−０３８０８７号公報JP 2010-038087 A

しかしながら、上記従来の技術によれば、内管の拡管された開口部を上密閉容器の貫通孔に通すため、貫通孔の径が大きくなり、この貫通孔と同一面上に設けた電源端子台用貫通孔との距離が短くなって、上密閉容器の耐圧強度が小さくなってしまう、という問題がある。密閉容器の胴部には、通常、吸音断熱材が巻かれるので、吐出管又は電源端子台を密閉容器の胴部へ移動させて両者の貫通孔間の距離を長くすることはできない。また、上密閉容器の耐圧強度を上げるために上密閉容器の肉厚を厚くするとコストアップになる、という問題が発生する。 However, according to the above conventional technique, since the expanded opening of the inner tube is passed through the through hole of the upper sealed container, the diameter of the through hole is increased, and the power supply terminal block provided on the same plane as the through hole There exists a problem that the distance with a through-hole for use will become short and the pressure resistance of an upper airtight container will become small. Since the sound absorbing heat insulating material is usually wound around the trunk of the sealed container, it is not possible to move the discharge pipe or the power terminal block to the trunk of the sealed container to increase the distance between the through holes. Moreover, if the thickness of the upper airtight container is increased in order to increase the pressure resistance of the upper airtight container, there arises a problem that the cost is increased.

さらに、外管の材質を銅材とし、この外管を上密閉容器に溶接固定しているので、この外管を空気調和機の冷凍サイクル側の銅管に接続した場合、密閉型圧縮機の振動により、外管には繰り返し応力が発生し、外管の根元部、すなわち、外管の上密閉容器との溶接部で、繰返し応力が最大となる。そのため、外管には、疲労強度が要求され、銅管の場合鋼管よりも肉厚が必要となりコストアップになる、という問題がある。 Furthermore, since the outer tube is made of copper and the outer tube is welded and fixed to the upper sealed container, when this outer tube is connected to the copper tube on the refrigeration cycle side of the air conditioner, the hermetic compressor Due to the vibration, repeated stress is generated in the outer tube, and the repeated stress becomes maximum at the root portion of the outer tube, that is, the welded portion with the upper sealed container of the outer tube. For this reason, the outer pipe is required to have fatigue strength, and in the case of a copper pipe, there is a problem that a wall thickness is required as compared with a steel pipe and the cost is increased.

本発明は、上記に鑑みてなされたものであって、上密閉容器の肉厚を厚くせずに耐圧強度を確保することができると共に、吐出管の肉厚を厚くせずに疲労強度を高めた冷媒圧縮機を得ることを目的とする。 The present invention has been made in view of the above, and can ensure the pressure resistance without increasing the thickness of the upper sealed container and increase the fatigue strength without increasing the thickness of the discharge pipe. An object is to obtain a refrigerant compressor.

上述した課題を解決し、目的を達成するために、本発明は、上部シェルを有する筐体と、前記筐体内に配置された冷媒圧縮部と、前記筐体内に配置され前記冷媒圧縮部を駆動するモータと、前記上部シェルに設けられた第１の貫通孔に気密に固定された電源端子台と、前記上部シェルに設けられた第２の貫通孔に挿通され接合されて前記冷媒圧縮部で圧縮された冷媒を外部へ吐出する吐出管と、を備える冷媒圧縮機において、前記吐出管は、前記上部シェルの外部に配置された拡径部と前記上部シェルの第２の貫通孔に挿通されて前記上部シェルの内部に配置された非拡径部とを有し、前記拡径部と非拡径部の間の段部が前記上部シェルに接合された鋼管と、前記鋼管の拡径部に挿入され前記拡径部の端部に接合された銅管と、を備えることを特徴とする。 In order to solve the above-described problems and achieve the object, the present invention provides a casing having an upper shell, a refrigerant compression section disposed in the casing, and driving the refrigerant compression section disposed in the casing. A motor, a power supply terminal block that is airtightly fixed to a first through hole provided in the upper shell, and a second through hole provided in the upper shell that is inserted into and joined to the refrigerant compression unit. And a discharge pipe that discharges the compressed refrigerant to the outside. The discharge pipe is inserted into a diameter-enlarged portion disposed outside the upper shell and a second through hole of the upper shell. A steel pipe in which a step between the enlarged diameter part and the non-expanded part is joined to the upper shell, and an enlarged diameter part of the steel pipe A copper pipe inserted into the end portion of the enlarged diameter portion. And features.

本発明にかかる冷媒圧縮機は、密閉容器（筐体）の耐圧強度が確保されると共に、吐出管の疲労強度が高い、という効果を奏する。 The refrigerant compressor according to the present invention has an effect that the pressure resistance strength of the sealed container (housing) is ensured and the fatigue strength of the discharge pipe is high.

図１は、本発明に係る冷媒圧縮機の実施例を示す縦断面図である。FIG. 1 is a longitudinal sectional view showing an embodiment of a refrigerant compressor according to the present invention. 図２は、図１のＡ部拡大図である。FIG. 2 is an enlarged view of part A in FIG. 図３は、本発明に係る冷媒圧縮機の上部シェルを示す上面図である。FIG. 3 is a top view showing the upper shell of the refrigerant compressor according to the present invention. 図４は、本発明に係る冷媒圧縮機の上部シェルを示す縦断面図である。FIG. 4 is a longitudinal sectional view showing the upper shell of the refrigerant compressor according to the present invention.

以下に、本発明に係る冷媒圧縮機の実施例を図面に基づいて詳細に説明する。なお、この実施例によりこの発明が限定されるものではない。 Below, the example of the refrigerant compressor concerning the present invention is described in detail based on a drawing. Note that the present invention is not limited to the embodiments.

図１は、本発明に係る冷媒圧縮機の実施例を示す縦断面図であり、図２は、図１のＡ部拡大図であり、図３は、本発明に係る冷媒圧縮機の上部シェルを示す上面図であり、図４は、本発明に係る冷媒圧縮機の上部シェルを示す縦断面図である。 1 is a longitudinal sectional view showing an embodiment of a refrigerant compressor according to the present invention, FIG. 2 is an enlarged view of a portion A in FIG. 1, and FIG. 3 is an upper shell of the refrigerant compressor according to the present invention. FIG. 4 is a longitudinal sectional view showing the upper shell of the refrigerant compressor according to the present invention.

図１に示すように、冷媒圧縮機１は、ロータリ式圧縮機であり、密閉された縦置き円筒状の筐体１０の下部に配置された冷媒圧縮部１２と、筐体１０の上部に配置され、回転軸１５を介して冷媒圧縮部１２を駆動するモータ１１と、を備えている。 As shown in FIG. 1, the refrigerant compressor 1 is a rotary type compressor, and is arranged at the upper part of the casing 10 and the refrigerant compressor 12 disposed at the lower part of the sealed vertical cylindrical casing 10. And a motor 11 that drives the refrigerant compressor 12 via the rotating shaft 15.

モータ１１のステータ１１１は、筐体１０の内周面に固定されている。モータ１１のロータ１１２は、ステータ１１１の中央部に配置され、モータ１１と冷媒圧縮部１２とを機械的に接続する回転軸１５に固定されている。 The stator 111 of the motor 11 is fixed to the inner peripheral surface of the housing 10. The rotor 112 of the motor 11 is disposed at the center of the stator 111 and is fixed to a rotating shaft 15 that mechanically connects the motor 11 and the refrigerant compressor 12.

モータ１１が作動して回転軸１５が回転すると、冷媒圧縮部１２は、アキュムレータ２５及び低圧連絡管３１を介して、冷凍サイクルの低圧側から連続的に冷媒ガスを吸入して圧縮し、筐体１０内及び吐出管１０７を通して外部（冷凍サイクルの高圧側）へ吐出する。 When the motor 11 is actuated to rotate the rotating shaft 15, the refrigerant compressor 12 continuously sucks and compresses the refrigerant gas from the low pressure side of the refrigeration cycle via the accumulator 25 and the low pressure communication pipe 31. 10 and discharged to the outside (high pressure side of the refrigeration cycle) through the discharge pipe 107.

図１〜図４に示すように、筐体１０の上部シェル１０ａに設けられた第１の貫通孔１０ｂには、モータ１１のステータ巻線の電源接続端子１１６を固定する電源端子台１１５が、上部シェル１０ａの内側から外側に嵌入されて気密に固定されている。電源端子台１１５には、複数（３本）の電源接続端子１１６が貫通して固定されている。電源接続端子１１６と電源端子台１１５との間は、絶縁シール材（例えば、ガラス）により絶縁シールされている。 As shown in FIGS. 1 to 4, in the first through hole 10 b provided in the upper shell 10 a of the housing 10, a power terminal block 115 for fixing the power connection terminal 116 of the stator winding of the motor 11 is provided. The upper shell 10a is fitted from the inside to the outside and is fixed in an airtight manner. A plurality (three) of power connection terminals 116 are fixed through the power terminal block 115. The power connection terminal 116 and the power terminal block 115 are insulated and sealed with an insulating sealing material (for example, glass).

吐出管１０７は、筐体１０の上部シェル１０ａに設けられた第２の貫通孔１０ｃに挿通され銀ロー付けにより接合されている。吐出管１０７は、銅材料の使用量を減らしてコストダウンを図るために、一部分を鋼管１０８で構成し、鋼管１０８と銅管１０９とを接続した構造となっている。 The discharge pipe 107 is inserted into the second through hole 10c provided in the upper shell 10a of the housing 10 and joined by silver brazing. The discharge pipe 107 has a structure in which a part of the discharge pipe 107 is formed of a steel pipe 108 and the steel pipe 108 and the copper pipe 109 are connected in order to reduce the amount of copper material used and to reduce the cost.

鋼管１０８は、上部シェル１０ａの外部に配置された拡径部１０８ａと、上部シェル１０ａの第２の貫通孔１０ｃに挿通されて上部シェル１０ａの内部に配置された非拡径部１０８ｂとを有し、拡径部１０８ａと非拡径部１０８ｂの間の段部１０８ｃが上部シェル１０ａに銀ロー付けにより接合されている。銅管１０９は、一端１０９ａが鋼管１０８の拡径部１０８ａに挿入され、拡径部１０８ａの端部１０８ａａに銀ロー付けにより接合されている。銅管１０９の他端は、冷凍サイクルの高圧側の銅管（図示せず）に接続される。 The steel pipe 108 has an enlarged diameter portion 108a disposed outside the upper shell 10a, and a non-diameter enlarged portion 108b disposed inside the upper shell 10a by being inserted into the second through hole 10c of the upper shell 10a. The step portion 108c between the enlarged diameter portion 108a and the non-expanded diameter portion 108b is joined to the upper shell 10a by silver brazing. One end 109a of the copper pipe 109 is inserted into the enlarged diameter portion 108a of the steel pipe 108, and is joined to the end portion 108aa of the enlarged diameter portion 108a by silver brazing. The other end of the copper tube 109 is connected to a copper tube (not shown) on the high pressure side of the refrigeration cycle.

以上説明した実施例の冷媒圧縮機１によれば、上部シェル１０ａの第２の貫通孔１０ｃには、鋼管１０８の非拡径部１０８ｂが挿通されるので、拡径部１０８ａを挿通するのに比べ、第２の貫通孔１０ｃの内径が小さくて済む。そのため、上部シェル１０ａの、第１の貫通孔１０ｂと第２の貫通孔１０ｃとの間の幅Ｌ（図３、図４参照）が広くなり、上部シェル１０ａの耐圧強度が小さくなるのを防ぐことができる。 According to the refrigerant compressor 1 of the embodiment described above, the non-expanded portion 108b of the steel pipe 108 is inserted into the second through hole 10c of the upper shell 10a, so that the expanded portion 108a is inserted. In comparison, the inner diameter of the second through hole 10c may be small. For this reason, the width L (see FIGS. 3 and 4) of the upper shell 10a between the first through hole 10b and the second through hole 10c is widened to prevent the pressure strength of the upper shell 10a from being reduced. be able to.

また、冷媒圧縮機１の運転時の振動により、吐出管１０７には、応力が発生し、吐出管１０７と上部シェル１０ａとの銀ロー付けによる接合部でこの応力が最大となるが、鋼管１０８の拡径部１０８ａと非拡径部１０８ｂの間の段部１０８ｃを上部シェル１０ａに銀ロー付けにより接合し、銅管１０９の一端１０９ａを鋼管１０８の拡径部１０８ａに挿入して拡径部１０８ａの端部１０８ａａに銀ロー付けにより接合したので、上記応力が最大となる部分を素材強度の大きい鋼管１０８とすることができ、応力が最大となる部分を銅管１０９とするよりもコストを抑えて必要な疲労強度を得ることができる。 Further, due to vibration during operation of the refrigerant compressor 1, stress is generated in the discharge pipe 107, and this stress is maximized at the joint portion of the discharge pipe 107 and the upper shell 10a by silver brazing. The step portion 108c between the expanded diameter portion 108a and the non-expanded diameter portion 108b is joined to the upper shell 10a by silver brazing, and one end 109a of the copper pipe 109 is inserted into the expanded diameter portion 108a of the steel pipe 108 to expand the expanded diameter portion. Since the end portion 108aa of 108a is joined by silver brazing, the portion where the stress is maximized can be a steel pipe 108 having a high material strength, and the portion where the stress is maximized is less expensive than the copper tube 109. The required fatigue strength can be obtained by restraining.

さらに、上部シェル１０ａの第２の貫通孔１０ｃに、鋼管１０８の非拡径部１０８ｂを挿通し、段部１０８ｃを上部シェル１０ａに銀ロー付けにより接合するとき、段部１０８ｃが第２の貫通孔１０ｃに当接して鋼管１０８が位置決め保持されるので、銀ロー付けによる接合作業が容易である。実施例の冷媒圧縮機１は、電源端子台１１５を吐出管１０７の近傍に配置せざるを得ない小型の冷媒圧縮機１に有用である。 Further, when the non-expanded diameter portion 108b of the steel pipe 108 is inserted into the second through hole 10c of the upper shell 10a and the step portion 108c is joined to the upper shell 10a by silver brazing, the step portion 108c is inserted into the second through hole 10c. Since the steel pipe 108 is positioned and held in contact with the hole 10c, the joining work by silver brazing is easy. The refrigerant compressor 1 according to the embodiment is useful for a small-sized refrigerant compressor 1 in which the power terminal block 115 must be disposed in the vicinity of the discharge pipe 107.

１冷媒圧縮機
１０筐体
１０ａ上部シェル
１０ｂ第１の貫通孔
１０ｃ第２の貫通孔
１１モータ
１２冷媒圧縮部
１５回転軸
２５アキュムレータ
３１低圧連絡管
１０７吐出管
１０８鋼管
１０８ａ拡径部
１０８ｂ非拡径部
１０８ｃ段部
１０９銅管
１１１ステータ
１１２ロータ
１１５電源端子台
１１６電源接続端子 DESCRIPTION OF SYMBOLS 1 Refrigerant compressor 10 Case 10a Upper shell 10b 1st through-hole 10c 2nd through-hole 11 Motor 12 Refrigerant compression part 15 Rotating shaft 25 Accumulator 31 Low-pressure connection pipe 107 Discharge pipe 108 Steel pipe 108a Expanding part 108b Non-expanding diameter Part 108c Step part 109 Copper tube 111 Stator 112 Rotor 115 Power supply terminal block 116 Power supply connection terminal

Claims

上部シェルを有する筐体と、前記筐体内に配置された冷媒圧縮部と、前記筐体内に配置され前記冷媒圧縮部を駆動するモータと、前記上部シェルに設けられた第１の貫通孔に気密に固定された電源端子台と、前記上部シェルに設けられた第２の貫通孔に挿通され接合されて前記冷媒圧縮部で圧縮された冷媒を外部へ吐出する吐出管と、を備える冷媒圧縮機において、
前記吐出管は、前記上部シェルの外部に配置された拡径部と前記上部シェルの第２の貫通孔に挿通されて前記上部シェルの内部に配置された非拡径部とを有し、前記拡径部と非拡径部の間の段部が前記上部シェルに接合された鋼管と、前記鋼管の拡径部に挿入され前記拡径部の端部に接合された銅管と、を備えることを特徴とする冷媒圧縮機。 A casing having an upper shell, a refrigerant compression section disposed in the casing, a motor disposed in the casing and driving the refrigerant compression section, and a first through hole provided in the upper shell are hermetically sealed. And a discharge pipe that discharges the refrigerant compressed by the refrigerant compression section through the second through-hole provided in the upper shell and compressed by the refrigerant compression section. In
The discharge pipe has an enlarged diameter portion arranged outside the upper shell, and a non-diameter enlarged portion inserted into the second shell through the second through hole of the upper shell, A step between the enlarged diameter portion and the non-expanded diameter portion is provided with a steel pipe joined to the upper shell, and a copper pipe inserted into the enlarged diameter portion of the steel pipe and joined to the end of the enlarged diameter portion. A refrigerant compressor characterized by that.

前記上部シェルの第２の貫通孔は、前記第１の貫通孔の近傍に設けられることを特徴とする請求項１に記載の冷媒圧縮機。 The refrigerant compressor according to claim 1, wherein the second through hole of the upper shell is provided in the vicinity of the first through hole.