DE112018004132B4 - Scroll compressor - Google Patents

Abstract

Scroll compressor with:a first scroll (11); anda second spiral (12) revolving about an axis (C1) relative to the first spiral, wherein:the first spiral comprises:a first shell (112) formed in a spiral shape; anda web (113) connecting between opposing portions of the first shell in a radial direction (DRr) of the axis, thereby defining an outer peripheral compression portion (131) and an inner peripheral compression portion (132);wherein the inner peripheral compression portion is on an inner peripheral side of the outer peripheral compression portion in a spiral direction (DRg) which is along the spiral shape of the first shell;in response to the revolution of the second spiral, a fluid is compressed in the outer peripheral side compression section, and the fluid compressed in the outer peripheral side compression section is in the wherein the second spiral has a second shell (122) formed in a spiral shape and disposed on the outer peripheral side compression portion, and a third shell (123) formed in a spiral shape and disposed on the inner peripheral side compression portion;wherein the first shell comprises:an outer peripheral side inner sliding surface (112c) included in the outer peripheral side compression portion and facing an inner side in the radial direction and constructed to be slidably in contact with the second shell ;an inner peripheral side inner sliding surface (112j) included in the inner peripheral side compression portion and facing the inner side in the radial direction and configured to be slidably in contact with the third shell; andan inner peripheral side inner relief surface (112k) included in the inner peripheral side compression portion and facing the inner side in the radial direction and disposed on an outer peripheral side of the inner peripheral side inner sliding surface in the spiral direction;wherein the outer peripheral side inner sliding surface is formed by a portion of a first involute curve (L1). is formed;wherein the inner peripheral inner sliding surface is formed by a portion of a second involute curve (L2) which is inwardly offset relative to the first involute curve; andwherein the inner circumferential inner relief surface is constructed such that it is always spaced from the third casing regardless of the orbital position of the second spiral.

Description

The present application is based on the Japanese patent application filed on August 11, 2017 JP 2019-035356 A founded, the content of which is referred to here.

The present invention relates to a scroll compressor.

As this type of scroll compressor, a scroll compressor disclosed in Patent Document 1 is known. The scroll compressor of Patent Document 1 has a scroll shell formed in a spiral shape, and a center of the scroll is broken to form an outer peripheral side compression portion and an inner peripheral side compression portion. Thereby, the scroll compressor of Patent Document 1 is configured as a compressor that performs two-stage compression of a refrigerant. At the inner peripheral side compression portion, the coolant that has been compressed at the outer peripheral side compression portion is further compressed. Therefore, the inner peripheral side compression portion serves as a high level side compression portion, and the outer peripheral side compression portion serves as a low level side compression portion.

• Patentdokument 1: JP 2013-019274 A
• Patentdokument 2: DE 10 2014 113 435 A1
• Patentdokument 3: DE 602 13 146 T2
• Patentdokument 4: DE 601 09 703 T2
• Patentdokument 5: US 4 650 405 A
• Patentdokument 6: US 4 178 143 A
• Patentdokument 7: JP 2017-031887 A

In the scroll compressor of Patent Document 1, the outer peripheral stationary shell (shell) and the outer peripheral side circumferential shell (shell) included in the outer peripheral side compression portion are constructed so that pressures of the two compression chambers formed at the outer peripheral side compression portion become equal to each other at the time , in which these compression chambers merge with each other. In this way, the balance of the compressor becomes favorable and the efficiency of the compressor is improved.

• Patent document 1: JP 2013-019274 A
• Patent document 2: DE 10 2014 113 435 A1
• Patent document 3: DE 602 13 146 T2
• Patent document 4: DE 601 09 703 T2
• Patent document 5: US 4,650,405 A
• Patent Document 6: US 4,178,143 A
• Patent document 7: JP 2017-031887 A

DE 10 2014 113 435 A1 discloses a compressor which has the following: a compressor housing, a scroll compressor unit arranged in the compressor housing with a first, stationary compressor body and a second compressor body movable relative to the stationary compressor body, the first and second spiral ribs of which are designed in the form of an involute to form compressor chambers interlock when the second compressor body is moved relative to the first compressor body on an orbital path, an axial guide which supports the movable compressor body against movements in a direction parallel to a central axis of the stationary compressor body and guides movements in a direction transverse to the central axis, a drive motor , which drives an eccentric drive for the scroll compressor unit, which has a driver driven by the drive motor and rotating on a path around a central axis of a drive shaft, which cooperates with a driver receptacle of the second compressor body, and a clutch which prevents the second compressor body from rotating.

DE 602 13 146 T2 discloses a multi-stage compressor spiral fluid machine that further compresses a fluid that has been compressed and cooled by a pre-stage compressor by means of a post-stage compressor.

DE 601 09 703 T2 discloses a spiral fluid machine with multi-stage compression in which the fluid compressed in a preliminary stage is further compressed in a subsequent stage, a spiral groove being formed spirally from the area of the outlet port of the subsequent stage to the fluid receiving side of the preliminary stage and between the outlet port of the preliminary stage and the suction port the subsequent stage, a web is formed, characterized in that a sealing element is accommodated in a tip sealing groove in the tip of the turn and an intermediate sealing element is accommodated in an intermediate groove which is formed on the surface of the web facing the end plate of a matching spiral in order to achieve a To prevent leakage of compressed fluid from the subsequent stage to the outlet port of the preliminary stage.

US 4,650,405 A discloses a multi-turn scroll pump consisting of a pump unit on each side of a base plate made of an oscillatory scroll piston driven by an eccentric drive. The pumping unit has a spiral groove in a spiral casing and a spiral displacement vane which forms part of the spiral piston. The groove in one of the pump units extends from the peripheral part of the spiral casing over at least one spiral turn and ends at the intermediate part of the casing. The groove in the other pump unit also starts near the peripheral part of the volute, but extends over a larger number of Spiral turns as the groove in the first pump unit. Passages are provided in the spiral piston to connect the grooves in both units so that the liquid sucked into the first pump unit is mainly compressed in the second pump unit and discharged exclusively from there. The mechanism for restricting the movement of the oscillating piston with respect to the volute is conveniently located within the confines of the groove in the first pump unit to reduce the overall radial dimension of the pump.

US 4,178,143 A discloses a positive displacement fluid pump comprising: a housing; a pair of facing scroll wheels in meshing relationship rotatably mounted within the housing on parallel offset axes; an opening through the housing terminating between the impellers near their axes of rotation and another opening through the housing disposed radially of the impellers; means for rotating one of the wheels; Ring means externally surrounding the scroll vanes and slidingly engaging the opposing portions of each impeller to transmit rotational motion from one impeller to the other impeller while allowing relative orbital motion therebetween, thereby causing fluid to pass between the scroll vanes and flows through the openings; and means for adjusting the distance between the impeller axles to control pump performance.

JP 2017-031887 A discloses a scroll compressor having a partition for dividing a compression chamber into an outer compression part and an inner compression part between a coil start on the middle side and a coil end on the outside of a fixed spiral tooth in the form of a spiral plate.

Although Patent Document 1 states that the balance of pressures of these two compression chambers formed at the outer peripheral side compression portion is important, there is no specification regarding the inner peripheral side compression portion. However, it is still important to equalize the pressures of the two compression chambers formed on the inner peripheral side compression portion as in the outer peripheral side compression portion.

In the compressor of Patent Document 1, relief is formed on an inner peripheral surface of the outer peripheral side stationary shell by cutting a portion of the inner peripheral surface of the outer peripheral side stationary shell so that compression of the refrigerant can be started simultaneously at the two compression chambers of the outer peripheral side compression portion. Therefore, in order to balance the pressures between the two chambers of the inner circumferential compression section, it is considered to provide relief on the inner circumferential compression section as in the outer circumferential compression section.

However, when the inner peripheral side compression portion is provided with the relief in the same manner as the outer peripheral side compression portion, the inner peripheral surface of an intermediate shell which is a division between the inner peripheral side compression portion and the outer peripheral side compression portion must be cut. When this happens, a shell wall thickness of the intermediate shell becomes thin, causing insufficient strength of the intermediate shell. This is because the intermediate shell forms the inner peripheral side compression portion with the inner peripheral surface of the intermediate shell and also forms the outer peripheral side compression portion with the outer peripheral surface of the intermediate shell.

For the reason explained above, upon extensive study, the inventors of the present invention have discovered that it is difficult to provide relief to the inner peripheral side compression portion in the same manner as the outer peripheral side compression portion of the compressor described in Patent Document 1.

Furthermore, as another method for providing relief, it is conceivable to increase the jacket wall thickness of the intermediate jacket in sections, which forms a division between the inner circumferential compression section and the outer circumferential compression section. In the two-stage compressor described above, when the shell wall thickness is increased, there is an advantage in that the heat insulation effect between the compression chambers separated by the shell can be increased and the strength of the shell portion (enclosure portion) can be increased. However, there is a disadvantage in that a sliding surface area increases, causing energy loss. Furthermore, in a compressor in which a sealing member is installed at an end portion of the shell, when the shell wall thickness is increased, the width of the sealing member must also be increased. Otherwise, a gap (space) of the tail portion is enlarged, resulting in an increase in leakage loss causing a deterioration in performance. For this reason, it is desirable to make the shell wall thickness as thin as possible.

In view of the above circumstance, an object of the present invention is to provide a scroll compressor which has relief at an inner peripheral side compression portion and prevents occurrence of insufficient strength of a shell and/or deterioration in performance of the scroll compressor caused by the Training the relief would be effected, limit or avoid.

• eine erste Spirale; und eine zweite Spirale, die um eine Achse relativ zu der ersten Spirale umläuft. Die erste Spirale hat: einen ersten Mantel, der in einer Spiralform ausgebildet ist; und einen Steg, der zwischen gegenüberliegenden Abschnitten des ersten Mantels in einer radialen Richtung der Achse verbindet und dadurch einen außenumfangsseitigen Kompressionsabschnitt und einen innenumfangsseitigen Kompressionsabschnitt definiert. Der innenumfangsseitige Kompressionsabschnitt ist an einer Innenumfangsseite des außenumfangsseitigen Kompressionsabschnittes in einer Spiralrichtung angeordnet, die entlang der Spiralform des ersten Mantels ist. Im Ansprechen auf ein Umlaufen der zweiten Spirale wird ein Fluid in dem außenumfangsseitigen Kompressionsabschnitt komprimiert, und das Fluid, das in dem außenumfangsseitigen Kompressionsabschnitt komprimiert wird, wird in dem innenumfangsseitigen Kompressionsabschnitt weiter komprimiert. Die zweite Spirale hat einen zweiten Mantel, der in einer Spiralform ausgebildet ist und an dem außenumfangsseitigen Kompressionsabschnitt angeordnet ist, und einen dritten Mantel, der in einer Spiralform ausgebildet ist und an dem innenumfangsseitigen Kompressionsabschnitt angeordnet ist. Der erste Mantel hat: eine außenumfangsseitige Innengleitfläche, die in dem außenumfangsseitigen Kompressionsabschnitt umfasst ist und zu einer Innenseite in der radialen Richtung gewandt ist und so aufgebaut ist, dass sie mit dem zweiten Mantel gleitfähig in Kontakt steht; eine innenumfangsseitige Innengleitfläche, die in dem innenumfangsseitigen Kompressionsabschnitt umfasst ist und zu der Innenseite in der radialen Richtung gewandt ist und so aufgebaut ist, dass sie mit dem dritten Mantel gleitfähig in Kontakt steht; und eine innenumfangsseitige Innenentlastungsfläche, die in dem innenumfangsseitigen Kompressionsabschnitt umfasst ist und zu der Innenseite in der radialen Richtung gewandt ist und an einer Außenumfangsseite der innenumfangsseitigen Innengleitfläche in der Spiralrichtung angeordnet ist. Die außenumfangsseitige Innengleitfläche ist durch einen Abschnitt einer ersten Involutkurve (Evolventenkurve) ausgebildet. Die innenumfangsseitige Innengleitfläche ist durch einen Abschnitt einer zweiten Involutkurve ausgebildet, die relativ zu der ersten Involutkurve nach innen versetzt ist. Die innenumfangsseitige Innenentlastungsfläche ist so aufgebaut, dass sie von dem dritten Mantel unabhängig von der Umlaufposition der zweiten Spirale stets beabstandet ist.

In order to achieve the above object, according to one aspect of the present invention there is provided a scroll compressor comprising:

• a first spiral; and a second spiral revolving about an axis relative to the first spiral. The first spiral has: a first jacket formed in a spiral shape; and a web connecting between opposing portions of the first shell in a radial direction of the axis, thereby defining an outer peripheral compression portion and an inner peripheral compression portion. The inner peripheral side compression portion is disposed on an inner peripheral side of the outer peripheral side compression portion in a spiral direction that is along the spiral shape of the first shell. In response to revolution of the second scroll, a fluid is compressed in the outer peripheral side compression portion, and the fluid compressed in the outer peripheral side compression portion is further compressed in the inner peripheral side compression portion. The second coil has a second shell formed in a spiral shape and disposed on the outer peripheral side compression portion, and a third shell formed in a spiral shape and disposed on the inner peripheral side compression portion. The first shell has: an outer peripheral side inner sliding surface included in the outer peripheral side compression portion and facing an inside in the radial direction and configured to be slidably in contact with the second shell; an inner peripheral side inner sliding surface included in the inner peripheral side compression portion and facing the inner side in the radial direction and configured to be slidably in contact with the third shell; and an inner peripheral side inner relief surface included in the inner peripheral side compression portion and facing the inner side in the radial direction and disposed on an outer peripheral side of the inner peripheral side inner sliding surface in the spiral direction. The outer circumferential inner sliding surface is formed by a portion of a first involute curve (involute curve). The inner circumferential inner sliding surface is formed by a portion of a second involute curve which is offset inwardly relative to the first involute curve. The inner circumferential inner relief surface is constructed in such a way that it is always spaced from the third casing regardless of the rotational position of the second spiral.

In the structure described above, the inner peripheral side inner sliding surface is offset to the inner side, for example, compared to the case in which the outer peripheral side inner sliding surface and the inner peripheral side inner sliding surface are each formed by the first involute curve. As a result, the inner circumferential inner relief surface can be arranged away (spaced apart) from the third jacket. More specifically, it is not necessary to reduce the wall thickness of the portion of the first shell on which the inner peripheral side internal relief surface is formed in order to space the inner peripheral side internal relief surface away from the third shell. Therefore, the relief can be formed by the inner peripheral side inner relief surface on the inner peripheral side compression portion, and it is possible to avoid insufficient strength of the first shell caused by the formation of the relief.

• 1 zeigt eine Querschnittsansicht eines Kompressors entlang einer Ebene, die eine Kompressorachse umfasst, gemäß einem ersten Ausführungsbeispiel.
• 2 zeigt eine Querschnittsansicht eines Kompressionsmechanismus des ersten Ausführungsbeispiels entlang einer Ebene, die eine bewegliche Basisplattenfläche umfasst, das heißt eine Primärquerschnittsansicht, die entlang einer Linie II-II in 1 aufgenommen ist.
• 3 zeigt eine Querschnittsansicht einer ortsfesten Spirale, die nur von dem in 2 gezeigten Kompressionsmechanismus aufgenommen ist.
• 4 zeigt eine Sekundärquerschnittsansicht entlang einer Linie II-II, wobei eine Umlaufwinkelposition der in 4 gezeigten beweglichen Spirale sich von derjenigen aus 2 unterscheidet.
• 5 zeigt eine Sekundärquerschnittsansicht eines Querschnittes entlang V-V in 2.
• 6 zeigt eine Querschnittsansicht einer beweglichen Spirale, die lediglich von dem in 2 gezeigten Kompressionsmechanismus aufgenommen ist.
• 7 zeigt eine Querschnittsansicht einer ortsfesten Spirale, die lediglich von einem Kompressor eines Vergleichsbeispiels aufgenommen ist und 3 entspricht.
• 8 zeigt eine Querschnittsansicht einer beweglichen Spirale, die lediglich von dem Kompressor des Vergleichsbeispiels aufgenommen ist und 6 entspricht.
• 9 zeigt eine Querschnittsansicht entsprechend 2, wobei eine Umlaufwinkelposition der beweglichen Spirale des Vergleichsbeispiels zu einem Kompressionsstartzeitpunkt gezeigt ist, bei dem eine Kompression eines Kühlmittels an jeder Kompressionskammer eines außenumfangsseitigen Kompressionsabschnittes beginnt.
• 10 zeigt eine Querschnittsansicht entsprechend 4, wobei eine Umlaufwinkelposition der beweglichen Spirale des Vergleichsbeispiels zu einem Kompressionsstartzeitpunkt gezeigt ist, bei dem die Kompression des Kühlmittels an einer zweiten innenumfangsseitigen Kompressionskammer eines innenumfangsseitigen Kompressionsabschnittes beginnt.
• 11 zeigt eine Querschnittsansicht entsprechend 4, wobei eine Umlaufwinkelposition der beweglichen Spirale des Vergleichsbeispiels zu einem Kompressionsstartzeitpunkt gezeigt ist, bei dem eine Kompression des Kühlmittels an einer ersten innenumfangsseitigen Kompressionskammer des innenumfangsseitigen Kompressionsabschnittes beginnt.
• 12 zeigt eine Querschnittsansicht eines zweiten Ausführungsbeispiels entlang einer Linie II-II in 1, wobei diese 2 entspricht.
• 13 zeigt eine Querschnittsansicht entlang einer Linie XIII-XIII in 2 gemäß dem zweiten Ausführungsbeispiel.
• 14 zeigt eine Querschnittsansicht entlang einer Linie XIV-XIV in 2 gemäß dem zweiten Ausführungsbeispiel.
• 15 zeigt eine Querschnittsansicht eines dritten Ausführungsbeispiels entlang einer Linie II-II in 1, wobei diese 2 entspricht.
• 16 zeigt eine Querschnittsansicht eines vierten Ausführungsbeispiels entlang einer Linie II-II in 1, wobei diese 15 entspricht.
• 17 zeigt eine Darstellung eines Bereiches XVII in 16 in vergrößertem Maßstab, wobei Positionsänderungen eines außenumfangsseitigen beweglichen Mantels im Ansprechen auf ein Umlaufen einer beweglichen Spirale gezeigt sind.
• 18 zeigt eine Querschnittsansicht entlang einer Linie XVIII-XVIII in 17.

The parenthesized reference numerals of the constituent elements show an example of correspondence between the constituent elements and the specific constituent elements described in the embodiments set forth below.

• 1 shows a cross-sectional view of a compressor along a plane that includes a compressor axis, according to a first embodiment.
• 2 1 shows a cross-sectional view of a compression mechanism of the first embodiment taken along a plane including a movable base plate surface, that is, a primary cross-sectional view taken along a line II-II in FIG 1 is recorded.
• 3 shows a cross-sectional view of a stationary spiral, which is only visible from the in 2 Compression mechanism shown is included.
• 4 shows a secondary cross-sectional view along a line II-II, with a rotation angle position of the in 4 The moving spiral shown extends from the one shown 2 differs.
• 5 shows a secondary cross-sectional view of a cross section along VV in 2 .
• 6 shows a cross-sectional view of a movable spiral, which is only of the in 2 Compression mechanism shown is included.
• 7 shows a cross-sectional view of a stationary scroll that is only accommodated by a compressor of a comparative example and 3 corresponds.
• 8th shows a cross-sectional view of a movable scroll accommodated only by the compressor of the comparative example and 6 corresponds.
• 9 shows a cross-sectional view accordingly 2 , showing a revolution angular position of the movable scroll of the comparative example at a compression start timing at which compression of a refrigerant begins at each compression chamber of an outer peripheral side compression portion.
• 10 shows a cross-sectional view accordingly 4 , wherein a revolution angular position of the movable scroll of the comparative example is shown at a compression start timing at which compression of the refrigerant begins at a second inner peripheral compression chamber of an inner peripheral compression portion.
• 11 shows a cross-sectional view accordingly 4 , wherein a revolution angular position of the movable scroll of the comparative example is shown at a compression start timing at which compression of the refrigerant begins at a first inner peripheral side compression chamber of the inner peripheral side compression portion.
• 12 shows a cross-sectional view of a second embodiment along a line II-II in 1 , where these 2 corresponds.
• 13 shows a cross-sectional view along a line XIII-XIII in 2 according to the second exemplary embodiment.
• 14 shows a cross-sectional view along a line XIV-XIV in 2 according to the second exemplary embodiment.
• 15 shows a cross-sectional view of a third embodiment along a line II-II in 1 , where these 2 corresponds.
• 16 shows a cross-sectional view of a fourth embodiment along a line II-II in 1 , where these 15 corresponds.
• 17 shows a representation of an area XVII in 16 on an enlarged scale, showing position changes of an outer peripheral movable shell in response to orbiting of a movable scroll.
• 18 shows a cross-sectional view along a line XVIII-XVIII in 17 .

Examples of embodiments are described below with reference to the drawings. In each of the following embodiments, the portions that are identical or equivalent to each other are shown using like reference numerals.

A first exemplary embodiment is described below.

1 shows a cross-sectional view of a scroll compressor (scroll compressor) 1 of the present exemplary embodiment. The scroll compressor 1 (hereinafter simply referred to as compressor 1) is off 1 forms a section of a cooling cycle (cooling circuit). More specifically, the compressor 1 of the present embodiment sucks in a refrigerant (a fluid circulating in the refrigeration cycle) and discharges the sucked refrigerant after compressing the sucked refrigerant.

Furthermore, since the refrigeration cycle is constructed as a two-stage compression cycle, an intermediate pressure refrigerant having an intermediate pressure is injected into the compressor 1. The intermediate pressure is a pressure that is higher than the lowest coolant pressure in the cooling cycle and lower than the highest coolant pressure in the cooling cycle. The coolant circulating in the cooling cycle is, for example, carbon dioxide (i.e. CO ₂ ). For example, this cooling cycle forms one section of a hot water delivery system.

Like this in 2 As shown, the compressor 1 of the present exemplary embodiment is an electric scroll compressor. The compressor 1 has a compression mechanism 10 configured to compress the refrigerant and an electric motor 20 configured to drive the compression mechanism 10. The compressor 1 is of a vertical type in which the compression measure mechanism 10 and the electric motor 20 are arranged one after the other in an up and down direction (in other words, in a longitudinal direction). The compressor 1 has the compression mechanism 10, the electric motor 20 and a housing 30. In 1 An arrow DR1 shows the upward and downward direction DR1 of the compressor 1.

The housing 30 is a closed container that forms an outer jacket of the compressor 1 and is designed to be gas-tight. The housing 30 is generally formed in a cylindrical tube-like shape with two closed ends and has a tube-like member 31, a cover member 32 and a bottom member 33. An axial direction of the tube-like member 31 coincides with the up and down direction DR1 . The cover member 32 is arranged on an upper side of the tubular member 31. The bottom element 33 is arranged on a lower side of the tubular element 31. The housing 30 accommodates the compression mechanism 10 and the electric motor 20 inside the housing 30.

The electric motor 20 has a stator 21 serving as a stationary member, and a rotor 22 disposed on an inside of the stator 21 and serving as a rotatable member. The stator 21 includes a stator core and a stator winding (coil), the stator winding being wound around the stator core.

A drive shaft 25 is inserted through the interior of the rotor 22, and the drive shaft 25 is connected to the rotor 22 so that the drive shaft 25 is not rotatable relative to the rotor 22. Therefore, when electric power is supplied to the electric motor 20 through power supply terminals 23, the drive shaft 25 and the rotor 22 are integrally rotated about a compressor axis C1. The compressor axis C1 is an axis C1 extending in the up and down direction DR1. More specifically, in the present embodiment, the axial direction DRa of the compressor axis C1 coincides with the upward and downward direction DR1. In the following discussion, the axial direction DRa of the compressor axis C1 is also referred to as a compressor axial direction DRa.

The drive shaft 25 includes a rotor insertion shaft portion 251, a flange portion 252, and a lower end portion 253. The rotor insertion shaft portion 251, the flange portion 252, and the lower end portion 253 are integrally formed in one piece. The rotor insertion shaft portion 251 is a rotary shaft having the compressor axis C1 as its central axis. The rotor insertion shaft portion 251 is inserted through the inside of the rotor 22. The flange portion 252 and the lower end portion 253 are arranged on the lower side of the rotor 22.

The flange portion 252 of the drive shaft 25 is formed to protrude in the form of a flange in a radial direction DRr of the compressor axis C1. A bulge weight 254 is installed on the flange portion 252. In the following description, the radial direction DRr of the compressor axis C1 is also referred to as a compressor radial direction DRr.

An end portion of the rotor insertion shaft portion 251 protrudes from the rotor 23 to the upper side and is inserted into a bearing member 27 fixed to the housing 30. Furthermore, a lower end portion of the rotor insertion shaft portion 251 connected to the flange portion 252 protrudes from the rotor 22 to the lower side and is inserted into a bearing portion 291 of a middle case 29 fixed to the case 30. This supports the drive shaft 25 so that the drive shaft 25 is rotatable about the compressor axis C1.

The compression mechanism 10 includes a stationary scroll 11 serving as a first scroll and a movable scroll 12 serving as a second scroll. The movable scroll 12 is disposed on the lower side of the middle housing 29, and the stationary scroll 11 is disposed on the lower side of the movable scroll 12.

The movable scroll 12 is a movable member constructed to rotate around the compressor axis C1 relative to the stationary scroll 11. The movable scroll 12 is also referred to as an orbiting scroll or orbiting scroll. The stationary scroll 11 is a stationary side member serving as a non-rotatable member, and is fixed to the housing 30.

• eine bewegliche Basisplatte 121, die in einer kreisartigen Scheibenform ausgebildet ist; einen außenumfangsseitigen beweglichen Mantel 123, der in einer Spiralform ausgebildet ist; und einen innenumfangseitigen beweglichen Mantel 123, der in einer Spiralform ausgebildet ist. Der außenumfangsseitige bewegliche Mantel 122 und der innenumfangsseitige bewegliche Mantel 123 ragen von der beweglichen Basisplatte 121 zu der unteren Seite (das heißt zu der einen Seite in der Kompressoraxialrichtung DRa) vor. In 2 ist die Darstellung von Sauglöchern 111c, 111e und von Abgabelöchern 111d, 111f aus Gründen der Vereinfachung weggelassen worden, und dieses gilt auch für die nachstehend beschriebenen 9 bis 12.

Like this in the 1 and 2 is shown, the movable spiral 12 has:

• a movable base plate 121 formed in a circular disc shape; an outer peripheral movable shell 123 formed in a spiral shape; and an inner peripheral-side movable shell 123 formed in a spiral shape. The outer peripheral movable shell 122 and the inner peripheral movable shell 123 protrude from the movable base plate 121 to the lower side (that is, to the one side in the compressor axial direction DRa). In 2 is the representation of suction holes 111c, 111e and delivery holes chern 111d, 111f have been omitted for reasons of simplicity, and this also applies to those described below 9 until 12 .

Like this in the 1 until 3 As shown, the stationary scroll 11 has: a stationary base plate 111 formed in a circular disc shape; a stationary shell 112 formed in a spiral shape; and a ridge 113. The stationary base plate 111 is disposed on the lower side of the movable base plate 121, and the stationary base plate 111 and the movable base plate 121 face each other in the up and down direction DR1. The stationary shell 112 and the ridge 113 protrude from the stationary base plate 111 to the upper side (that is, to the other side in the compressor axial direction DRa). The projection height of the web 113 is the same as a projection height of the stationary shell 112. The stationary shell 112 corresponds to a first shell, and the outer peripheral movable shell 122 corresponds to a second shell. Furthermore, the inner peripheral movable shell 123 corresponds to a third shell.

The web 113 connects between opposite portions of the stationary shell 112 in the compressor radial direction DRr, forming two compression portions 131, 132 constructed to compress the refrigerant. More specifically, the compressor 1 of the present embodiment is a two-stage compression type scroll compressor having two compression sections 131 and 132.

These two compression sections 131, 132 are an outer peripheral side compression section 131 and an inner peripheral side compression section 132. The inner peripheral side compression section 132 is located on an inner peripheral side of the outer peripheral side compression section 131 in a spiral direction DRg which is along the spiral shape of the stationary shell 112. More specifically, the outer peripheral side compression portion 131 is located on an outer peripheral side of the land 113 in the spiral direction DRg, and the inner peripheral side compression portion 132 is located on the inner peripheral side of the land 113 in the spiral direction DRg.

Furthermore, the outer peripheral side movable shell 122 is located in the outer peripheral side compression portion 131 and is constructed to compress the coolant to the outer peripheral side compression portion 131. The inner-periphery-side movable shell 123 is located on the inner-periphery-side compression portion 132 and is constructed to compress the coolant at the inner-periphery-side compression portion 132. The stationary jacket 112 extends over both the outer peripheral compression section 131 and the inner peripheral compression section 132.

In other words, an inner peripheral end portion of the stationary shell 112 in the spiral direction DRg is at a beginning of winding of the stationary shell 112, and an outer peripheral end portion of the stationary shell 112 in the spiral direction DRg is an end of winding of the stationary shell 112. In addition, an inner peripheral end portion of the stationary shell 112 is an end of the winding of the stationary shell 112 Outer peripheral movable shell 122 in the spiral direction DRg is a start of winding of the outer peripheral movable shell 122, and an outer peripheral end portion of the outer peripheral movable shell 122 in the spiral direction DRg is an end of winding of the outer peripheral movable shell 122. In addition, an inner peripheral end portion of the inner circumferential movable shell 123 in the spiral direction DRg, a start of winding of the inner peripheral movable shell 123, and an outer peripheral end portion of the inner peripheral movable shell 123 in the spiral direction DRg is an end of winding of the inner peripheral movable shell 123.

Like this in 1 As shown in FIG. The shaft fitting portion (also called a shaft inserting portion) 124 is disposed at a center of the movable base plate 121, and a lower end portion 253 of the drive shaft 25 is seated in the shaft fitting portion 124. In addition, the lower end portion 253 of the drive shaft 25 serves as an eccentric portion 253 to the compressor axis C1 is eccentric.

In addition, the compression mechanism 10 has a rotation limiting mechanism (not shown) that limits the rotation of the movable scroll 12. Therefore, the movable scroll 12 does not rotate but rotates relative to the stationary scroll 11 along a path in an annular shape around the compressor axis C1 in response to the rotation of the drive shaft 25. More specifically, the movable spiral 12 runs in a direction of an arrow Rt in 2 around the compressor axis C1, which serves as a circulation center.

Like this in the 2 and 3 As shown, since the stationary shell 112 is formed in the spiral shape, a spiral groove 11a formed in a spiral shape is formed in a gap defined between radially adjacent portions of the stationary shell 112 that are radially adjacent to each other . The stationary spiral 11 has the land 113. Therefore, the spiral groove 11a is divided into an outer peripheral spiral groove 11b and an inner peripheral spiral groove 11c, and the inner peripheral spiral groove 11c is arranged on the inner peripheral side of the outer peripheral spiral groove 11b in the spiral direction DRg, while the land 113 is located between the outer peripheral spiral groove 11b and the inner peripheral spiral groove 11c are arranged. That is, the spiral groove 11a of the stationary scroll 11 includes the outer peripheral side spiral groove 11b and the inner peripheral side spiral groove 11c. The land 113 functions as a partition (separating member) that separates between the outer peripheral side spiral groove 11b and the inner peripheral side spiral groove 11c.

In addition, the outer peripheral side spiral groove 11b is formed on the outer peripheral side compression portion 131, and the inner peripheral side spiral groove 11c is formed on the inner peripheral side compression portion 132. Therefore, the outer peripheral movable shell 122 is engaged with the stationary shell 112 at the outer peripheral side compression portion 131 so that the outer peripheral movable shell 122 is inserted into the outer peripheral side spiral groove 11b. Furthermore, the inner peripheral movable shell 123 is engaged with the stationary shell 112 at the inner peripheral side compression portion 132 so that the inner peripheral movable shell 123 is inserted into the inner peripheral side spiral groove 11c. In other words, the outer peripheral movable shell 122 is engaged with the stationary shell 112 at the outer peripheral compression portion 131, and the inner peripheral movable shell 123 is engaged with the stationary shell 112 at the inner peripheral compression portion 132.

Since the stationary shell 112 and the outer peripheral movable shell 122 are engaged with each other in the manner described above, a first outer peripheral compression chamber 131a and a second outer peripheral compression chamber 131b are formed on both radially opposite sides of the outer peripheral movable shell 122 at the outer peripheral compression portion 131, respectively , like this in 2 is shown. The first outer circumferential compression chamber 131a is located on the radially outer side of the outer circumferential movable shell 122, and the second outer circumferential compression chamber 131b is located on the radially inner side of the outer circumferential movable shell 122.

More specifically, how this forms in the 2 and 3 1, a portion of the outer peripheral side spiral groove 11b formed on the stationary scroll 11, the first outer peripheral side compression chamber 131a, or the second outer peripheral side compression chamber 131b. More specifically, the stationary shell 112 and the outer peripheral side movable shell 122 are engaged with each other so that the stationary shell 112 and the outer peripheral side movable shell 122 are in contact with each other in a plurality of locations around the first outer peripheral side compression chamber 131a and the second outer peripheral side compression chamber 131b.

Furthermore, since the stationary shell 112 and the inner-periphery-side movable shell 123 are engaged with each other, a first inner-periphery-side compression chamber 132a and a second inner-periphery-side compression chamber 132b are formed on both radially opposite sides of the inner-periphery-side movable shell 123 at the inner-periphery-side compression portion 132, respectively. like this in 4 is shown. The first inner circumferential compression chamber 132a is located on the radially outer side of the inner circumferential movable shell 123, and the second inner circumferential compression chamber 132b is located on the radially inner side of the inner circumferential movable shell 123.

More specifically, how this forms in the 3 and 4 1, a portion of the inner peripheral side spiral groove 11c formed on the stationary shell 11, the first inner peripheral side compression chamber 132a, or the second inner peripheral side compression chamber 132b. More specifically, the stationary shell 112 and the inner-periphery-side movable shell 123 are engaged with each other so that the stationary shell 112 and the inner-periphery-side movable shell 123 are in contact with each other at a plurality of locations to form the first inner-periphery-side compression chamber 132a and the second inner-periphery-side compression chamber 132b to train. Each of the compression chambers 131a, 131b, 132a, 132b may be referred to as a working chamber.

Like this in the 2 and 5 As shown, the stationary base plate 111 has two base plate surfaces 111a, 111b of the stationary base plate, which are surfaces of the stationary base plate 111 facing the movable base plate 121 side in the configuration pressor axial direction DRa. More specifically, each of the base plate surfaces 111a, 111b of the stationary base plate is a surface facing the upper side. Since the stationary shell 112 protrudes from the stationary base plate 111 to the upper side, the base plate surfaces 111a, 111b of the stationary base plate are connected to the base end 112b of the stationary shell 112 disposed on the base side in the compressor axial direction DRa.

An outer peripheral stationary base plate surface 111a, which is one of the base plate surfaces 111a, 111b of the stationary base plate, is included in the outer peripheral side compression portion 131 and forms a bottom surface of the outer peripheral side spiral groove 11b. The outer peripheral side stationary base plate surface 111a faces and is in contact with a distal end 122a of the outer peripheral side movable shell 122, which is disposed on the distal side in the compressor axial direction DRa. The distal end 122a of the outer peripheral movable shell 122 slides relative to the outer peripheral fixed base plate surface 111a in response to the rotation of the movable scroll 12.

Furthermore, an inner peripheral side fixed base plate surface 111b, which is the other of the base plate surfaces 111a, 111b of the fixed base plate, is included in the inner peripheral side compression portion 132 and forms a bottom surface of the inner peripheral side spiral groove 11c. The inner peripheral side stationary base plate surface 111b faces and is in contact with a distal end 123a of the inner peripheral side movable shell 123 disposed on the distal side in the compressor axial direction DRa. The distal end 123a of the inner peripheral movable shell 123 slides relative to the inner peripheral fixed base plate surface 111b in response to the rotation of the movable scroll 12.

Furthermore, how this is done in the 2 until 5 As shown in FIG. The outer peripheral side suction hole 111c is an outer peripheral side suction port constructed so that the coolant is sucked into the outer peripheral side compression portion 131. Furthermore, an outer peripheral side discharge hole 111d is formed around an inner peripheral end of the outer peripheral side stationary base plate surface 111a disposed on the inner peripheral side in the spiral direction DRg. The outer peripheral side discharge hole 111d is an outer peripheral side discharge portion configured to discharge the coolant from the outer peripheral side compression portion 131. Therefore, the coolant flows from the outer peripheral side suction hole 111c into each of the compression chambers 131a, 131b at the outer peripheral side compression portion 131, and the coolant compressed at the compression chambers 131a, 131b flows outward from the compression chambers 131a, 131b through the outer peripheral side discharge hole 111d . More specifically, in response to the rotation of the movable scroll 12, the compression chambers 131a, 131b communicate and connect with each other, and thereby the refrigerant compressed in the compression chambers 131a, 131b flows outward from the compression chambers 131a, 131b through the outer peripheral discharge hole 111b.

Furthermore, an inner peripheral side suction hole 111e is formed around an outer peripheral end of the other inner peripheral side stationary base plate surface 111b disposed on the outer peripheral side in the spiral direction DRg. The inner peripheral side suction hole 111e is an inner peripheral side suction port configured to suck the coolant into the inner peripheral side compression portion 132. The inner peripheral side suction hole 111e communicates with the outer peripheral side discharge hole 111d through a transmission channel 101 formed on the compression mechanism 10. More specifically, the outer peripheral side discharge hole 111d is constructed to discharge the coolant from the outer peripheral side compression portion 131 to the inner peripheral side compression portion 132, and the inner peripheral side suction hole 111e is constructed to discharge the coolant discharged from the outer peripheral side discharge hole 111d the inner circumferential compression section 132 leads.

Due to the coolant flow described above, in response to the rotation of the movable scroll 12, the outer peripheral side compression portion 131 compresses the coolant, and the inner peripheral side compression portion 132 further compresses the coolant previously compressed at the outer peripheral side compression portion 131. More specifically, the outer peripheral side compression portion 131 is a low pressure side compression portion, and the outer peripheral side movable shell 122 is a low pressure side movable shell. In contrast, the inner peripheral side compression portion 132 is a high pressure side compression portion, and the inner peripheral side movable shell 123 is a high pressure side movable shell. Different In other words, the compressor 1 of the present embodiment performs two-stage compression of the refrigerant.

Furthermore, an inner peripheral side discharge hole 111f is formed around an inner peripheral end of the inner peripheral side stationary base plate surface 111b disposed on the inner peripheral side in the spiral direction DRg. The inner peripheral side discharge hole 111f is an inner peripheral side discharge port configured to discharge the coolant from the inner peripheral side compression portion 132. Therefore, the coolant flows from the inner peripheral side suction hole 111e into each of the compression chambers 132a, 132b at the inner peripheral side compression portion 132, and the coolant compressed at the compression chambers 132a, 132b flows outward from the compression chambers 132a, 132b through the inner peripheral side discharge hole 111f . More specifically, in response to the rotation of the movable scroll 12, the compression chambers 132a, 132b communicate with and connect with each other, and thereby the refrigerant compressed in the compression chambers 132a, 132b flows outward from the compression chambers 132a, 132b through the inner peripheral side discharge hole 111f.

Furthermore, how this is done in the 2 and 3 As shown, the outer peripheral discharge hole 111d is covered and closed by the distal end 122a of the outer peripheral movable shell 122 in response to the orbiting of the movable scroll 12. More specifically, the outer peripheral side movable shell 122 has a discharge hole opening and closing portion 122c configured to open and close the outer peripheral side discharge hole 111d in response to the rotation of the movable scroll 12. The discharge hole opening and closing portion 122c is located at an inner peripheral end portion of the outer peripheral side movable shell (122) disposed on the inner peripheral side in the spiral direction DRg.

Similarly, the inner peripheral discharge hole 111f is covered and closed by the distal end 123a of the inner peripheral movable shell 123 in response to the orbiting of the movable scroll 12. More specifically, the inner peripheral side movable shell 123 has a discharge hole opening and closing portion 123c configured to open and close the inner peripheral side discharge hole 111f in response to the rotation of the movable scroll 12. The discharge hole opening and closing portion 123c is located at an inner peripheral end portion of the inner peripheral movable shell 123 disposed on the inner peripheral side in the spiral direction DRg.

Like this in the 2 until 5 As shown, the movable base plate 121 has a movable base plate base plate surface 121a, which is a surface of the movable base plate 121 facing the stationary base plate 111 side in the compressor axial direction DRa. More specifically, the base plate surface 121a of the movable base plate is a surface facing the lower side, and the base plate surface 121a of the movable base plate faces the base plate surfaces 111a, 111b of the stationary base plate, while the compression chambers 131a, 131b, 132a, 132b between the base plate surface 121a of the movable base plate and the base plate surfaces 111a, 111b of the stationary base plate are arranged. Since the outer peripheral movable shell 122 and the inner peripheral movable shell 123 protrude from the movable base plate 121 to the lower side, the base plate surface 121a of the movable base plate is connected to a base end 122b of the outer peripheral movable shell 122 and a base end 123b of the inner circumferential movable shell 123, which are located on the base side in the compressor axial direction DRa.

The base plate surface 121a of the movable base plate extends over both the outer peripheral side compression portion 131 and the inner peripheral side compression portion 132. The base plate surface 121a of the movable base plate is in contact with a distal end 112a of the stationary shell 112 disposed on the distal side in the compressor axial direction DRa is. The distal end 112a of the stationary shell 112 slides relative to the base plate surface 121a of the movable base plate in response to the rotation of the movable scroll 12.

Like this in the 1 and 3 As shown, the compression mechanism 10 has a supply section 14 configured to supply the coolant to the outer peripheral side compression section 131. The lowest pressure refrigerant, which has the lowest pressure in the refrigeration cycle in the compressor 1, flows into the supply section 14 through the refrigerant inlet 36. The refrigerant entering the supply section 14 flows into the outer peripheral side compression section 131 through the outer peripheral side suction hole 111c and is supplied to the respective compression chambers 131a, 131b on the outer peripheral side compression portion 131 as shown in Figs 2 and 3 is shown.

Like this in the 1 and 3 shown is a delivery chamber 111g at the stationary Base plate 111 is formed except the suction holes 111c, 111e and the discharge holes 111d, 111f. The discharge chamber 111g communicates with the inner peripheral side compression portion 132 through the inner peripheral side discharge hole 111f. A check valve (not shown) is installed on the discharge chamber 111g, and this check valve is constructed to allow the refrigerant to flow in from the inner peripheral side discharge hole 111f into the discharge chamber 111g and to limit the coolant to flow out from the discharge chamber 111g to the inner peripheral side discharge hole 111f (prevented).

The discharge chamber 111g is connected to a coolant outlet 49 of the compressor 1. Therefore, the refrigerant in the discharge chamber 111g is discharged from the refrigerant outlet 49 to an outside of the compressor 1 as shown by an arrow FLout. For example, the coolant is delivered to a condenser included in the cooling cycle.

Furthermore, the intermediate pressure refrigerant (intermediate pressure refrigerant) having the intermediate pressure (intermediate pressure) combines (mixes) with the refrigerant that is in the middle of compression in the compressor 1 of the present embodiment. More specifically, the intermediate pressure refrigerant is introduced from the outside of the compressor 1 into the transfer passage 101 through the intermediate pressure introduction passage 51 and a check valve 50 in this order. That is, at the transfer passage 101, the intermediate pressure coolant mixes with the coolant discharged from the outer peripheral side compression portion 131 and flows together with the coolant discharged from the outer peripheral side compression portion 131 into the inner peripheral side compression portion 132 through the inner peripheral side suction hole 111e. The check valve 50 allows the coolant flow from the intermediate pressure introduction channel 51 to the transfer channel 101 and limits the coolant flow (that is, the return flow of the coolant) from the transfer channel 101 to the intermediate pressure introduction channel 51.

Like this in the 2 and 3 As shown, the stationary shell 112 has a plurality of peripheral wall surfaces on the radially inner side and the radially outer side of the stationary shell 112. More specifically, the stationary shell 112 has an outer peripheral inner sliding surface 112c, an outer peripheral inner relief surface 112d, an outer peripheral outer sliding surface 112e, and a inner peripheral inner sliding surface 112j, an inner peripheral inner relief surface 112k and an inner peripheral outer sliding surface 112m as the peripheral wall surfaces of the stationary shell 112.

The outer peripheral side inner sliding surface 112c, the outer peripheral side inner relief surface 112d, and the outer peripheral side outer sliding surface 112e form a peripheral surface of the outer peripheral side spiral groove 11b and are thereby included in the outer peripheral side compression portion 131. In addition, the outer peripheral side inner relief surface 112d is located on the outer peripheral side of the outer peripheral side inner sliding surface 112c in the spiral direction DRg.

The outer peripheral side inner sliding surface 112c and the outer peripheral side inner relief surface 112d face the inner surface in the compressor radial direction DRr. Furthermore, an outer peripheral outer surface 122d of the outer peripheral movable shell 122 slides relative to the outer peripheral inner sliding surface 112c in response to the rotation of the movable scroll 12. In contrast, the outer peripheral inner relief surface 112d is constructed to always be supported by the outer peripheral movable shell 122 at each any rotational position of the movable spiral 12 is spaced apart. In other words, the outer-periphery-side internal relief surface 112d is constructed to always be spaced from the outer-periphery-side movable shell 122.

Due to the configurations described above, the outer peripheral inner sliding surface 112c and the outer peripheral inner relief surface 112d form a shoulder 112n formed as a shoulder in the compressor radial direction DRr, that is, an outer peripheral inner sliding surface 112n at a location between the outer peripheral inner sliding surface 112c and the outer peripheral inner delimbing surface 112d. The outer peripheral inner shoulder 112n is a shoulder that displaces the outer peripheral inner relief surface 112d outwardly in the compressor radial direction DRr relative to the outer peripheral inner sliding surface 112c.

The outer peripheral side outer sliding surface 112e faces the outside in the compressor radial direction DRr, and an outer peripheral side inner surface 122e of the outer peripheral side movable shell 122 is constructed to slidably contact the outer peripheral side outer sliding surface 112e in response to the rotation of the movable scroll 12.

In addition, the inner circumferential inner sliding surface 112j, the inner circumferential inner relief surface 112k and the inner circumferential side outer sliding surface 112m is a peripheral surface of the inner peripheral side spiral groove 11c, and are thereby included in the inner peripheral side compression portion 132. In addition, the inner peripheral side inner relief surface 112k is located on the outer peripheral side of the inner peripheral side inner sliding surface 112j in the spiral direction DRg.

The inner circumferential inner sliding surface 112j and the inner circumferential inner relief surface 112k face the inner side in the compressor radial direction DRr. In addition, the inner circumferential outer surface 123d of the inner circumferential movable shell 123 slides relative to the inner circumferential inner sliding surface 112j in response to the rotation of the movable scroll 12. In contrast, the inner circumferential inner relief surface 112k is constructed to always be supported by the inner circumferential movable shell 123 at any one point Circular position of the movable spiral 12 is spaced apart. In other words, the inner peripheral side internal relief surface 112k is constructed to always be spaced from the inner peripheral side movable shell 123.

Due to the configurations described above, the inner peripheral side inner sliding surface 112j and the inner peripheral side inner relief surface 112k form a shoulder 112o that forms a step in the compressor radial direction DRr, that is, an inner peripheral side inner shoulder 112o at a location between the inner peripheral side inner sliding surface 112j and the inner peripheral side inner relief surface 112k. The inner peripheral side inner shoulder 112o is a shoulder that displaces the inner peripheral side inner relief surface 112k outwardly in the compressor radial direction DRr relative to the inner peripheral side inner sliding surface 112j.

The inner peripheral side outer sliding surface 112m faces the outside in the compressor radial direction DRr, and an inner peripheral side inner circumferential surface 123e of the inner circumferential side movable shell is constructed to slidably contact the inner peripheral side outer sliding surface 112m in response to the rotation of the movable scroll 12.

Like this in the 2 and 6 As shown, the outer peripheral movable shell 122 has a plurality of peripheral wall surfaces on the radially inner side and the radially outer side of the outer peripheral movable shell. More specifically, the outer peripheral movable shell 122 has the outer peripheral outer surface 122d and the outer peripheral inner surface 122e as the peripheral wall surfaces of the outer peripheral movable shell 122.

The outer circumferential outer surface 122d faces the outside in the compressor radial direction DRr. The outer peripheral side outer surface 122d is formed as the sliding surface constructed to slidably contact the outer peripheral side inner sliding surface 112c.

In addition, the outer peripheral inner circumferential surface 122e faces the inside in the compressor radial direction DRr. The outer peripheral side inner surface 122e is formed as the sliding surface constructed to be slidably in contact with the outer peripheral side outer sliding surface 112e.

The inner peripheral movable shell has a plurality of peripheral wall surfaces on the radially inner side and the radially outer side of the inner peripheral movable shell 123. More specifically, the inner peripheral movable shell 123 has the inner peripheral outer shell surface 123d and the inner peripheral side inner shell surface 123e as the circumferential wall surfaces of the inner peripheral movable shell 123 .

The inner peripheral outer surface 123d faces the outside in the compressor radial direction DRr. The inner peripheral side outer surface 123d is formed as the sliding surface constructed to slidably contact the inner peripheral side inner sliding surface 112j.

In addition, the inner circumferential inner circumferential surface 123e faces the inside in the compressor radial direction DRr. The inner peripheral side inner surface 123e is formed as the sliding surface constructed to slidably contact the inner peripheral side outer sliding surface 112m.

Like this in the 2 , 3 and 6 As shown, since the outer peripheral movable shell 122 is constructed to be slidably in contact with the outer peripheral inner sliding surface 112c and the outer peripheral outer sliding surface 112e, the outer peripheral inner sliding surface 112c and the outer peripheral outer sliding surface 112e are each formed by an involute curve. The outer peripheral outer surface 122d and the outer peripheral inner surface 122e of the outer peripheral movable shell 122 are also each formed by an involute curve.

In addition, since the inner peripheral movable shell 123 is constructed to be slidably in contact with the inner peripheral inner sliding surface 112j and the inner peripheral outer sliding surface 112m, the inner peripheral inner sliding surface 112j and the inner peripheral outer sliding surface 112m are each formed by an involute curve. The inner peripheral outer surface 123d and the inner peripheral inner surface 123e of the inner peripheral movable shell 123 are also each formed by an involute curve.

In addition, the involute curve that forms the stationary shell 112 and the involute curve that forms the movable shells 122, 123 are each formed as interrupted curves between the outer peripheral side compression portion 131 and the inner peripheral side compression portion 132.

For example, like this in 3 As shown, the outer peripheral inner sliding surface 112c of the movable shell 112 is formed by a portion of a first involute curve L1. The inner peripheral inner sliding surface 112j is formed by a portion of a second involute curve L2 that is offset inwardly relative to the first involute curve L1. In other words, the second involute curve L2 is an involute curve that is formed by the first involute curve L1 being offset inwards. In other words, the second involute curve L2 is the involute curve which is arranged on the inside of the first involute curve L1 and extends along the first involute curve L1.

According to this structure, as in 6 is shown, the outer peripheral outer surface 122d of the outer peripheral movable shell 122 is formed by a portion of a third involute curve L3. The inner peripheral outer surface 123d of the inner peripheral movable shell 123 is formed by a portion of a fourth involute curve L4 which is offset inwardly relative to the third involute curve L3. In other words, the fourth involute curve L4 is the involute curve which is arranged on the inside of the third involute curve L3 and extends along the third involute curve L3.

Furthermore, how this is in 3 shown is the outer circumferential outer sliding surface 112e of the stationary jacket 112 formed by a section of a fifth involute curve L5. The inner peripheral outer sliding surface 112m is formed by a portion of a sixth involute curve L6 which is offset inwardly relative to the fifth involute curve L5. In other words, the sixth involute curve L6 is the involute curve located on the inside of the fifth involute curve L5 and extending along the fifth involute curve L5.

According to this structure, as in 6 is shown, the outer peripheral inner surface 122e of the outer peripheral movable shell 122 is formed by a portion of a seventh involute curve L7. The inner peripheral inner surface 123e of the inner peripheral movable shell 123 is formed by a portion of an eighth involute curve L8 which is offset inwardly relative to the seventh involute curve L7. In other words, the eighth involute curve L8 is the involute curve that is located on the inside of the seventh involute curve L7 and extends along the seventh involute curve L7.

In the present embodiment, although the inner peripheral side internal relief surface 112k of the stationary shell 112 is formed by a portion of the first involute curve L1, it may not be necessary to form the inner peripheral side internal relief surface 112k by the involute curve.

Hereinafter, for the purpose of explaining the usefulness of the compressor 1 of the present embodiment, a compressor 90 is shown in FIG 7 until 11 shown comparative example described. Like this in the 7 and 8th is shown is the in 3 Inner peripheral relief surface 112k shown is not formed in the compressor 90 of the comparative example.

Furthermore, in the compressor 90 of the comparative example, an inner peripheral wall surface 901 forming the inner peripheral side spiral groove 11c and an inner peripheral wall surface 112c forming the outer peripheral side spiral groove 11b are each formed by a common involute curve L1. In addition, an outer peripheral wall surface 902 forming the inner peripheral side spiral groove 11c and an outer peripheral wall surface 112e forming the outer peripheral side spiral groove 11d are each formed by a common involute curve L5.

In addition, an outer peripheral wall surface 903 of the inner peripheral movable shell 123 and an outer peripheral wall surface 122d of the outer peripheral movable shell 122 are each formed by a common involute curve L3. In addition, an inner peripheral wall surface 904 of the inner peripheral movable shell 123 and an inner peripheral wall surface 122e of the outer peripheral movable shell 122 are each formed by a common involute curve L7.

Even with the compressor 90 of the comparative example, as shown in 9 shown is a relief on the outer circumferential compression section 131 formed by the outer circumferential inner relief surface 112d of the stationary jacket 112. Therefore, in the outer peripheral side compression portion 131, the compression of the coolant at the first outer peripheral side compression chamber 131a and the second outer peripheral side compression chamber 131b can be started simultaneously. The relief is defined as a portion of the peripheral wall surface of the stationary shell 112 which is always spaced from the peripheral wall surface of the movable shell 122, 123.

In contrast, the relief is not formed at the inner peripheral side compression portion 132 of the compressor 90 of the comparative example, so the timing for starting compression of the refrigerant at the first inner peripheral side compression chamber 132 cannot be adjusted. Therefore, the timing of compression of the coolant at the first inner peripheral side compression chamber 132a is different relative to the timing of compression of the coolant at the second inner peripheral side compression chamber 132b, so that the compression of the coolant in the inner peripheral side compression portion 132 of the comparative example is unbalanced (unbalanced). For example, the compression of the coolant begins at the second inner peripheral compression chamber 132b when the movable scroll 12 is one in 10 rotation angle position shown is reached. In contrast, the compression of the refrigerant begins at the first inner peripheral compression chamber 132a when the movable scroll 12 is one in 11 rotation angle position shown is reached.

Furthermore, in order to form the relief at the inner peripheral side compression portion 132 in the compressor 90 of the comparative example, the inner peripheral wall surface 901 forming the inner peripheral side spiral groove 11c may be recessed radially outward. In such a case, a wall thickness of a portion of the stationary shell 112 where the relief of the inner peripheral side compression portion 132 is formed is reduced, possibly causing insufficient strength of the stationary shell 112. Therefore, the relief cannot be formed at the inner peripheral side compression portion 132 in the compressor 90 of the comparative example.

In contrast, according to the present embodiment, as shown in Figures 2 and 3 is shown, the outer circumferential inner sliding surface 112c of the stationary casing 112 is formed by a portion of the first involute curve L1. Furthermore, the inner circumferential inner sliding surface 112j of the stationary shell 112 is formed by a portion of the second involute curve L2 that is offset inwardly relative to the first involute curve L1.

Due to the configurations described above, the inner peripheral side inner sliding surface 112j of the present embodiment is shifted (offset) toward the inner side relative to the first involute curve L1 as compared to the case in which the outer peripheral side inner sliding surface 112c and the inner peripheral side inner sliding surface 112j are each formed by the first involute curve L1 are. As a result, the inner circumferential inner relief surface 112k is always spaced from the inner circumferential movable casing 123.

More specifically, it is not necessary to reduce the wall thickness of the portion of the stationary shell 112 on which the inner peripheral side internal relief surface 112k is formed in order to space the inner peripheral side internal relief surface 112k away from the inner peripheral side movable shell 123. Therefore, the relief can be formed by the inner peripheral side internal relief surface 112k on the inner peripheral side compression portion 132, and it is possible to avoid insufficient strength of the stationary shell 112 that would be caused by forming the relief.

For example shows 4 the movable scroll 12 at the orbital angle position assumed at the time of blocking the communication between each compression chambers 132a, 132b of the inner peripheral side compression portion of the 132 and the inner peripheral side suction hole 111e in response to the orbiting of the movable scroll 12. More precisely, shows 4 the movable scroll 12 at the revolution angle position at the compression start timing at which compression of the refrigerant begins at each of the compression chambers 132a, 132b of the inner peripheral side compression portion 132. Like this in 4 As shown, in the present embodiment, the compression start timing of the first inner peripheral side compression chamber 132a is set to be the same as the compression start timing of the second inner peripheral side compression chamber 132b. This setting can be realized because the in 3 shown inner circumferential inner shoulder 112o can be set at any position.

Furthermore, it is like this in 4 As shown in FIG to limit (avoid) the second inner peripheral compression chamber 132b. In this way, for example, it is possible to avoid the deterioration in the efficiency of the compressor 1 that would be caused by the imbalance between the refrigerant pressure of the first inner peripheral side compression chamber 132a and the refrigerant pressure in the second inner peripheral side compression chamber 132b.

Furthermore, according to the present embodiment, as shown in FIGS 2 and 3 As shown, the outer peripheral side inner relief surface 112d of the stationary shell 112 is included in the outer peripheral side compression portion 131 and faces the inner side in the compressor radial direction DRr. In addition, the outer peripheral side inner relief surface 112d is disposed on the outer peripheral side of the outer peripheral side inner sliding surface 112c in the spiral direction DRg. Furthermore, the outer-periphery-side internal relief surface 112d is constructed to always be spaced from the outer-periphery-side movable shell 122 at any revolution position of the movable scroll 12. Therefore, the compression start timing at which the compression of the refrigerant at the first outer peripheral side compression chamber 131a begins can be adjusted by adjusting the position of the outer peripheral side inner shoulder 112n.

For example shows 2 the movable scroll 12 at the revolution angle position assumed at the time of blocking the communication between each of the compression chambers 131a, 131b of the outer peripheral side compression portion 131 and the outer peripheral side suction hole 111c in response to the revolution of the movable scroll 12. More precisely, shows 2 the movable scroll 12 at the revolution angle position assumed at the compression start timing at which compression of the refrigerant begins at each of the compression chambers 131a, 131b of the outer peripheral side compression portion 131. Like this in 2 As shown, in the present embodiment, the compression start timing of the first outer peripheral side compression chamber 131a is set to be the same as the compression start point of the second outer peripheral side compression chamber 131b. This setting can be realized because the in 3 shown outer circumferential inner shoulder 112n can be set at any position.

Furthermore, it is like this in 2 As shown, since the compression start timing of the first outer peripheral side compression chamber 131a is set to be the same as the compression start timing of the second outer peripheral side compression chamber 131b, it is possible that imbalance (the imbalance) between the coolant pressure in the first outer peripheral side compression chamber 131a and the coolant pressure in the second outer peripheral compression chamber 131b. In this way, for example, it is possible to avoid the deterioration in the efficiency of the compressor 1 that would be caused by the imbalance between the refrigerant pressure in the first outer peripheral side compression chamber 131a and the refrigerant pressure in the second outer peripheral side compression chamber 131b.

In addition, in the present exemplary embodiment, as in the 2 and 6 is shown, the outer peripheral lateral surface 122d of the outer peripheral movable casing 122 is formed by the portion of the third involute curve L3. In addition, the inner peripheral outer surface 123d of the inner peripheral movable shell 123 is formed by the portion of the fourth involute curve L4 that is offset inwardly relative to the third involute curve L3.

Through the configurations described above, each of the movable shells 122, 123 can be moved according to a difference (difference) between the first involute curve L1 which defines the outer peripheral side inner sliding surface 112c 3 and the second involute curve L2 can be formed, which forms the inner circumferential inner sliding surface 112j 3 trains.

A second exemplary embodiment is described below. In the present exemplary embodiment, the differences from the first exemplary embodiment are mainly described. Furthermore, the description of the portions that are the same or equivalent to the portions described in the above-explained embodiment is omitted or simplified. This also applies to the exemplary embodiments described below.

Like this in the 12 until 14 As shown, in the present exemplary embodiment the stationary jacket 112 has a stationary sealing material 114, which serves as a first sealing material. In addition, the outer peripheral movable shell 122 has an outer peripheral movable sealing material 125 serving as a second sealing material, and the inner peripheral movable shell 123 has an inner peripheral movable sealing material 126 serving as a third sealing material. The present embodiment differs from the first embodiment in these points.

Each sealing material 114, 125, 126 is a sealing material, also referred to as a tail seal. Each sealing material 114, 125, 126 is made of an elastomer such as polyetheretherketone plastic (i.e., PEEK plastic).

The stationary sealing material 114 is installed at the distal end 112a of the stationary shell 112. More specifically, a first seal receiving groove 112p, which is open to the base plate surface 121a of the movable base plate, is formed at the distal end 112a of the stationary shell 112. The stationary sealing material 114 sits in the first seal receiving groove 112b and is urged against the base plate surface 121a of the movable base plate. In this way, the stationary sealing material 114 seals a gap CR1 between the distal end 112a of the stationary shell 112 and the base plate surface 121a of the movable base plate. The stationary sealing material 114 is in closing contact and slides relative to the base plate surface 121a of the movable base plate in response to the rotation of the movable scroll 12.

Furthermore, the stationary sealing material 114 is formed in a prismatic shape and extends along the spiral shape of the stationary shell 112. The stationary sealing material 114 extends from an inner peripheral end portion of the stationary shell 112 to the outer peripheral side inner shoulder 112n in the spiral direction DRg along the spiral shape of the stationary Mantel 112.

The stationary sealing material 114 extends such that a width of the stationary sealing material 114 measured in a wall thickness direction of the stationary shell 112 is constant or approximately constant along a length of the stationary sealing material 114. This is to allow expansion and contraction of the stationary sealing material 114 in a longitudinal direction of the stationary sealing material 114. This also applies to a width of the outer peripheral movable sealing material 125 and a width of the inner peripheral movable sealing material 126.

The outer peripheral movable sealing material 125 is installed at the distal end 122a of the outer peripheral movable shell 122. More specifically, a second seal receiving groove 122f, which is open to the outer peripheral side fixed base plate surface 111a, is formed at the distal end 122a of the outer peripheral side movable shell 122. The outer peripheral movable sealing material 125 is seated in the second seal receiving groove 122 and is urged against the outer peripheral fixed base plate surface 111a. In this way, the outer peripheral movable sealing material 125 seals a gap CR2 between the distal end 122a of the outer peripheral movable shell 122 and the outer peripheral fixed base plate surface 111a. The outer peripheral movable sealing material 125 is in closing contact and slides relative to the outer peripheral fixed base plate surface 111a in response to the rotation of the movable scroll 12.

Furthermore, the outer peripheral movable sealing material 125 is formed in a prismatic shape and extends along the spiral shape of the outer peripheral movable shell 122. The outer peripheral movable sealing material 125 extends from an inner peripheral end portion of the outer peripheral movable shell 122 to an outer peripheral end portion of the outer peripheral movable shell 122 in FIG Spiral direction DRg along the spiral shape of the outer peripheral movable shell 122.

The inner peripheral movable sealing material 126 is installed on the distal end 123a of the inner peripheral movable shell 123. More specifically, a third seal receiving groove 123f, which is open to the inner peripheral side stationary base plate surface 111b, is formed at the distal end 123a of the inner peripheral side movable shell 123. The inner peripheral movable sealing material 126 sits in the third seal receiving groove 123f and is urged against the inner peripheral fixed base plate surface 111b. In this way, the inner peripheral movable sealing material 126 seals a gap CR3 between the distal end 123a of the inner peripheral movable shell 123 and the inner peripheral fixed base plate surface 111b. The inner peripheral movable sealing material 126 is in closing contact and slides relative to the inner peripheral fixed base plate surface 111b in response to the rotation of the movable scroll 12.

Furthermore, the inner peripheral movable sealing material 126 is formed in a prismatic shape and extends along the spiral shape of the inner peripheral movable shell 123. The inner peripheral movable sealing material 126 extends from an inner peripheral end portion of the inner peripheral movable shell 123 to an outer peripheral end portion of the inner peripheral movable shell 123 in FIG Spiral direction DRg along the spiral shape of the inner peripheral movable shell 123.

In addition, as this has in the 12 and 13 As shown, the stationary shell 112 has a section 112q of increasing width in which the outer peripheral outer sliding surface 112e and the inner peripheral inner sliding surface 112j are respectively formed. The width increasing portion 112q is a portion of the stationary shell 112 located on the inner peripheral side of the inner peripheral side inner shoulder 112o in the spiral direction DRg. The width increasing portion 112q forms a wall separating between the outer peripheral side compression portion 131 and the inner peripheral side compression portion 132. A width of the width-increasing portion 112q measured in the wall thickness direction increases compared to an outer peripheral side portion of the stationary shell 112 located on the outer peripheral side of the inner peripheral side inner shoulder 112o in the spiral direction DRg. The stationary sealing material 114 is not centered at a center of the width-increasing portion 112q that is centered in the wall thickness direction of the width-increasing portion 112q. More specifically, the stationary sealing material 114 at the increasing width portion 112q is offset toward the inside in the compressor radial direction DRr, that is, it is decentered relative to the center of the increasing width portion 112q toward the inside in the compressor radial direction DRr .

Except for the points described above, the present embodiment is the same as the first embodiment. In the present embodiment, such advantages achieved by the general structure which is the same as the first embodiment can be achieved as in the first embodiment.

Furthermore, according to the present embodiment, as shown in FIGS 12 until 14 As shown, the stationary sealing material 114 is installed at the distal end 112a of the stationary shell 112 and seals the gap CR1 between the distal end 112a of the stationary shell 112 and the base plate surface 121a of the movable base plate. In addition, the outer peripheral movable sealing material 125 is installed at the distal end 122a of the outer peripheral movable shell 122 and seals the clearance CR2 between the distal end 122a of the outer peripheral movable shell 122 and the outer peripheral fixed base plate surface 111a. In addition, the inner peripheral movable sealing material 126 is installed at the distal end 123 of the inner peripheral movable shell 123 and seals the clearance CR3 between the distal end 123a of the inner peripheral movable shell 123 and the inner peripheral fixed base plate surface 111b.

Therefore, the sealing materials 114, 125, 126 can limit the leakage of the refrigerant from the compression chambers 131a, 131b, 132a, 132b formed on the outer peripheral side compression portion 131 and the inner peripheral side compression portion 132, and thereby the refrigerant can be efficiently compressed.

Furthermore, according to the present embodiment, as shown in FIGS 12 and 13 As shown in FIG .

A leakage of the refrigerant flowing in a direction of an arrow LK1 through a portion of the clearance CR1 between the distal end 112a of the stationary shell 112 and the base plate surface 121a of the movable base plate on the outside of the stationary sealing material 114 in the compressor radial direction GRr becomes leakage of the coolant at the outer peripheral side compression portion 131. In contrast, leakage of the coolant flowing at another portion of the clearance CR1 on the inside of the stationary sealing material 114 in the compressor radial direction DRr becomes leakage of the coolant at the inner circumferential compression section 132.

Therefore, due to the location of the stationary sealing material 114 at the portion 112q as the width increases, it is possible to preferably limit the leakage of the coolant of the inner peripheral side compression portion 132 via the leakage of the coolant of the outer peripheral side compression portion 131. In addition, the coolant pressure of the interior tends to increase 132 is higher than the coolant pressure of the outer peripheral side compression portion 131, the leakage amount at the inner peripheral side compression portion 132 is larger than the leakage amount at the outer peripheral side compression portion 131 when the leakage amount at the same leakage cross-sectional area in both the outer peripheral side compression portion 131 and the inner circumferential compression section 132 is measured. Therefore, it is possible to limit the coolant leakage in the coolant compression process by preferably limiting the leakage of the coolant at the inner peripheral side compression portion 132 where the leakage amount tends to be high. In 13 A portion W1 of the gap CR1 between the distal end 112a of the stationary shell 112 and the base plate surface 121h of the movable base plate corresponds to the leakage cross-sectional area of the leakage of the coolant indicated by the capital arrow LK1 in 12 is shown.

A third embodiment is described below. In the present exemplary embodiment, the differences compared to the first exemplary embodiment are mainly described.

Like this in 15 As shown, the present embodiment differs from the first embodiment in terms of the structure of the outer peripheral side outer sliding surface 112e of the stationary shell 112 and in terms of the structure of the outer peripheral side inner shell surface 122e of the outer peripheral side movable shell 122.

More specifically, the outer peripheral outer sliding surface 112e includes a first outer peripheral outer surface 112f, a second outer peripheral outer surface 112g, and an outer peripheral outer shoulder 112h, while the outer peripheral outer shoulder 112h is formed between the first outer peripheral outer surface 112f and the second outer peripheral outer surface 112g. Although the outer peripheral movable shell 122 is not in contact with the outer peripheral outer shoulder 112h, the outer peripheral movable shell 122 is constructed to be slidable with the first outer peripheral outer surface 112f and the second outer peripheral outer surface 112g in response to the rotation of the movable Spiral 12 is in contact.

Since the outer peripheral side outer sliding surface 112e is included in the outer peripheral side compression portion 131, the first outer peripheral side outer surface 112f, the second outer peripheral side outer surface 112g, and the outer peripheral side outer shoulder 112h are also included in the outer peripheral side compression portion 131. Furthermore, the first outer peripheral side outer surface 112f and the second outer peripheral side outer surface 112g face the outside in the compressor radial direction DRr like the outer peripheral side outer sliding surface 112e of the first embodiment.

The first outer peripheral surface 112f is located on the outer peripheral side of the second outer peripheral surface 112g in the spiral direction DRg. A portion of the first outer peripheral side outer surface 112f forms an outer peripheral surface of the stationary shell 112 opposite to the inner peripheral side inner relief surface 112k of the stationary shell 112.

Furthermore, the second outer peripheral side outer surface 112g forms an outer peripheral surface of the stationary shell 112 which is opposed to the inner peripheral side inner sliding surface 112j.

The first outer peripheral outer surface 112f and the second outer peripheral outer surface 112g form the outer peripheral outer shoulder 112h between the first outer peripheral outer surface 112f and the second outer peripheral outer surface 112g. The outer peripheral outer shoulder 112h is a shoulder that offsets the second outer peripheral outer surface 112g inward relative to the first outer peripheral outer surface 112f in the compressor radial direction DRr.

More specifically, the first outer peripheral side outer surface 112f is the same as the portion of the outer peripheral side outer sliding surface 112e of the first embodiment. That is, the first outer peripheral outer surface 112f is formed by the portion of the fifth involute curve L5 that forms the outer peripheral outer sliding surface 112e of the first embodiment, as shown in FIG 3 is shown.

In addition, the second outer peripheral outer surface 112g is formed by the portion of the sixth involute curve L6 which forms the inner peripheral outer sliding surface 112m of the first embodiment as shown in FIG 3 is shown.

In the present embodiment, the stationary shell 112 is formed in the manner described above, and thereby the stationary shell 112 is formed so that the wall thickness of the stationary shell 112 is approximately constant (generally constant) along the entire length of the spiral shape of the stationary shell 112.

The outdoor frame surface 122e of the external circumference 122 includes a first outdoor range of 122g, a second outdoor range of 122h and an outdoor range 122i, with the outdoor area 122i between the first external range 122g and the second external surface and the second outer outer. Axring in the inner coat area 122h is formed. The first outer peripheral inner surface 122g is located on the outer peripheral side of the second outer peripheral inner surface 122h in the spiral direction DRg.

The first outer peripheral inner surface 122g and the second outer peripheral inner surface 122h face the inner surface in the compressor radial direction DRr as in the outer peripheral inner surface 122e of the first embodiment. In response to the rotation of the movable scroll 12, the first outer peripheral inner surface 122g is constructed to slidably contact the first outer peripheral surface 112f, and the second outer peripheral inner surface 122h is constructed to slidably contact the second outer peripheral surface 112g is in contact. The outer peripheral inner shoulder 122e is not in contact with the outer peripheral outer sliding surface 112e of the stationary shell 112.

The first outer peripheral inner surface 122g and the second outer peripheral inner surface 122h form the outer peripheral inner shoulder 122i between the first outer peripheral inner surface 122g and the second outer peripheral inner surface 122h. The outer peripheral inner shoulder 122i is a shoulder formed to correspond to the outer peripheral outer shoulder 112h of the stationary shell 112, and the second outer peripheral inner surface 122h is a shoulder which defines the second outer peripheral inner surface 122h relative to the first outer peripheral inner surface 122g in FIG Compressor radial direction DRr offset inwards.

More specifically, the first outer peripheral inner surface 122g is the same as the portion of the outer peripheral inner surface 122e of the first embodiment. That is, the first outer peripheral inner surface 122g is formed by the portion of the seventh involute curve L7, which forms the outer peripheral inner surface 122e of the first embodiment, as shown in FIG 6 is shown.

In addition, the second outer peripheral inner surface 122h is formed by the portion of the eighth involute curve L8, which forms the inner peripheral inner surface 123e of the first embodiment, as shown in FIG 6 is shown.

In addition, as this includes in 15 As shown, the outer peripheral side movable shell 122, an inner peripheral side portion member 122j and an outer peripheral side portion member 122k. The inner peripheral side portion member 122j is a portion of the outer peripheral side movable shell 122 disposed on the inner peripheral side of the outer peripheral side inner shoulder 122i in the spiral direction DRg. That is, the inner peripheral side portion member 122j is the portion of the outer peripheral side movable shell 122 that has the second outer peripheral side inner surface 122h. Furthermore, the discharge hole opening and closing portion 122c constructed to open and close the outer peripheral side discharging hole 111d is formed on the inner peripheral end portion of the outer peripheral side movable shell 122 disposed on the inner peripheral side in the spiral direction DRg so that the discharging hole opening and closing portion 122c is configured to open and close the outer peripheral side discharging hole 111d -closure portion 122c is included in the inner peripheral side portion member 122j.

In contrast, the outer peripheral side portion member 122k is another portion of the outer peripheral side movable shell 122 disposed on the outer peripheral side of the outer peripheral side inner shoulder 122i in the spiral direction DRg. That is, the outer peripheral side portion member 122k is the portion of the outer peripheral side movable shell 122 that has the first outer peripheral side inner surface 122g.

Furthermore, as described above, since the second outer peripheral side inner surface 122h is offset inwardly relative to the first outer peripheral inner surface 122g in the compressor radial direction DRr, the wall thickness T1 of the inner peripheral side portion member 122j is larger than the wall thickness T2 of the outer peripheral side portion member 122k.

Furthermore, the wall thickness T1 of the inner peripheral side portion member 122j is larger than a wall thickness T3 of a portion 112r of the stationary shell 112 having the second outer peripheral side outer surface 112g.

Except for the points described above, the present embodiment is the same as the first embodiment. In the present embodiment, the advantages achieved by the common structure which is the same as the first embodiment can be achieved in a similar manner to the first embodiment.

Furthermore, according to the present embodiment, the first outer peripheral outer surface 112f and the second outer peripheral outer surface 112g of the stationary shell 112 form the outer peripheral outer shoulder 112h between the first outer peripheral outer surface 112f and the second outer peripheral outer surface 112g. The outer peripheral outer shoulder 112h is a shoulder that offsets the second outer peripheral outer surface 112g inward relative to the first outer peripheral outer surface 112f in the compressor radial direction DRr. In addition, the first outer peripheral inner surface 122g and the second outer peripheral inner surface 122h of the outer peripheral movable shell 122 form the outer peripheral inner shoulder 122e, which corresponds to the outer peripheral outer shoulder 112h, between the first outer peripheral inner surface 122d and the second outer peripheral inner surface 122h.

Therefore, a wall thickness at a winding start point of the outer peripheral movable shell 122, that is, a wall thickness of an inner peripheral side portion of the outer peripheral movable shell 122 located on the inner peripheral side in the spiral direction DRg, can be increased. Thus, the rigidity of the winding start point of the outer peripheral movable shell 122, which is easy to deform, is increased, and thereby the deformation of the outer peripheral movable shell 122 can be reduced. Therefore, for example, a further increase in the efficiency of the compressor 1 at the time of compressing the refrigerant is expected.

Furthermore, according to the present embodiment, the wall thickness T1 of the inner peripheral side portion member 122j is larger than the wall thickness T3 of the portion 112r of the stationary shell 112 having the second outer peripheral side outer surface 112g. In addition, in the outer peripheral side movable shell 122, the wall thickness T1 of the inner peripheral side portion member 122j is larger than the wall thickness T2 of the outer peripheral side portion member 122k. In view of this circumstance, as described above, it can be said that the rigidity of the winding start portion of the outer peripheral movable shell 122, which is easily deformed, is increased, and thereby the deformation of the outer peripheral movable shell 122 can be reduced.

A fourth embodiment is described below. In the present exemplary embodiment, the differences compared to the third exemplary embodiment are mainly described.

Like this in 16 As shown, in the present embodiment, the stationary shell 112 has a stationary sealing material 114 that serves as the first sealing material. In addition, the outer peripheral movable shell 122 has an outer peripheral movable sealing material 125 serving as a second sealing material, and the inner peripheral movable shell 123 has an inner peripheral movable sealing material 126 serving as a third sealing material. The present embodiment differs from the third embodiment in these points.

These sealing materials 114, 125, 126 are basically the same as in the second embodiment. However, since the shape of the outer peripheral movable shell 122 in portions differs from that of the second embodiment, the arrangement of the outer peripheral movable sealing material 125 at the location where this difference in shape exists is different from the second embodiment.

More specifically, since the outer peripheral side movable sealing material 125 extends along the entire length of the outer peripheral side movable shell 122 in the spiral direction DRg, the outer peripheral side movable sealing material 125 also extends to the inner peripheral side portion member 122j. More specifically, how this extends into the 16 until 18 As shown in FIG. Since the discharge hole opening and closing portion 122c is a portion constructed to open and close the outer peripheral side discharge hole 111d, the opening and closing portion distal end 122m of the discharge hole opening and closing portion 122c is constructed to do so outer peripheral discharge hole 111d is covered, thereby closing the outer peripheral discharge hole 111d in response to the rotation of the movable scroll 12.

Furthermore, like this in 16 As shown in FIG is. More specifically, at the portion of the inner peripheral side portion member 122j different from the discharge hole opening and closing portion 122c, the outer peripheral side movable sealing material 125 is offset to the inner side in the compressor radial direction DRr in the range of the wall thickness of the outer peripheral side movable shell 122. For example, a distance Di between the second outer peripheral inner surface 122h and the outer peripheral movable sealing material 125 is smaller than a distance Do between the outer peripheral outer surface 122d and the outer peripheral movable sealing material 125.

In addition, as this has in the 17 and 18 As shown, the outer peripheral movable sealing material 125 has an outer end periphery 125a located at the outer end of the outer peripheral movable sealing material 125 in the compressor radial direction DRr.

In response to the orbiting of the movable scroll 12, the outer peripheral movable shell 122 progressively moves toward 17 positions shown in (a), (b), (c), (d), (e), (f), (g), and (h) in that order. Then the outer peripheral movable shell 122 returns from the inside 17 based on (h) to the position shown in 17 using the position shown in (a).

Like this in 17 As shown in FIG. More specifically, the entire outer peripheral side discharge hole 111d is always positioned on the inside of the outer end peripheral 125a of the outer peripheral side movable sealing material 125 in the compressor radial direction DRr at any revolution angular position of the movable scroll 12.

The outer peripheral side discharge hole 111d is positioned relative to the outer peripheral side movable sealing material 125 in the manner described above due to the position of the outer peripheral side movable sealing material 125 at the opening and closing portion distal end 122m of the outer peripheral side movable shell 122. More specifically, as shown in FIGS 17 and 18 is shown, this is because the outer peripheral movable sealing material 125 at the opening and closing portion distal end 122m of the outer peripheral movable shell 122 is offset to the outside in the compressor radial direction DRr. More specifically, this is because the outer peripheral movable sealing material 125 at the opening and closing portion distal end 122m is offset to the outside in the compressor radial direction DRr.

The present embodiment is the same as the third embodiment except for the points described above. In the present embodiment, the advantages achieved by the common structure which is the same as the third embodiment can be achieved in a similar manner to the third embodiment.

Furthermore, according to the present embodiment, as shown in 16 As shown in FIG is.

In this way, compared to the case where the outer peripheral side movable sealing material 125 at the distal end 122a of the outer peripheral side movable shell 122 is offset to the outside in the compressor radial direction DRr at the inner peripheral side portion member 122j, it is possible to prevent the leakage of the refrigerant in the To reduce compression process. More specifically, the coolant leakage discussed here is a leakage of coolant flowing along the outer peripheral movable sealing material 125 after passing through the gap located between the distal end 122a and the outer peripheral fixed base plate surface 111a corresponding part of the width of the distal end 122a of the outer peripheral movable shell 122 where the outer peripheral movable sealing material 125 is missing.

The leakage of the coolant can be reduced as described above for the following reason. That is, the pressure of the second outer peripheral side compression chamber 131b becomes higher than the pressure of the first outer peripheral side compression chamber 131a, and the outer peripheral side movable sealing material 125 is offset to the second outer peripheral side compression chamber 131b, which is the high pressure side, so that the outer peripheral side movable sealing material 125 is more effective can limit the leakage of the coolant. In summary, this is because the leakage cross-sectional area on the high-pressure side can be reduced. In this way, at the outer peripheral side compression portion 131, it is possible to reduce the leakage of the coolant flowing along the outer peripheral side movable sealing material 125 at the corresponding part of the width of the distal end 122a of the outer peripheral side movable shell 122 on which the outer peripheral side movable sealing material 125 missing.

Furthermore, according to the present embodiment, as shown in FIGS 17 and 18 As shown in FIG.

Here, when the first outer peripheral side compression chamber 131a and the second outer peripheral side compression chamber 131b communicate with each other through the outer peripheral side discharge hole 111d, the refrigerant flows from the one of the compression chambers 131a, 131b having the higher pressure to the other of the compression chambers 131a, 131b , which has the lower pressure, causing a loss in compression of the coolant. In view of this point, in the present embodiment, since the outer peripheral side discharge hole 111d does not bridge between the radially outside and the radially inner side of the outer peripheral side movable sealing material 125, it is possible to prevent the occurrence of communication between the compression chambers 131a, 131b through the outer peripheral side discharge hole 111d avoid. Therefore, it is possible to avoid an increase in loss that would occur if the outer peripheral side discharge hole 111d is constructed to bridge between the radially outer side and the radially inner side of the outer peripheral side movable sealing material 125.

Furthermore, according to the present embodiment, as shown in FIGS 17 and 18 As shown in FIG. Therefore, compared to the case where the outer peripheral movable sealing material 125 at the opening and closing portion distal end 122m is offset to the inside in the compressor radial direction DRr, the bridging between the radially outer side and the radially inner side of the outer peripheral movable can be achieved Sealing material 125 can be more easily limited through the outer peripheral discharge hole 111d in response to the rotation of the movable scroll 12. Furthermore, the size of the outer peripheral side hole 111d can be increased while limiting (avoiding) the occurrence of bridging between the radially outer side and the radially inner side of the outer peripheral side movable sealing member 125 by the outer peripheral side discharge hole 111d.

Further exemplary embodiments are described below.

(1) In each of the exemplary embodiments explained above, as described in 3 As shown in FIG. For example, it may not be necessary to introduce the intermediate pressure coolant into the compressor 1.

(2) In each of the above-explained embodiments, the compressor forms 1 1 the section of the hot water delivery system. Alternatively, the compressor 1 may be applied in another system or device other than a hot water delivery system.

(3) In each of the above-explained embodiments, the fluid sucked by the compressor 1 is, for example, carbon dioxide as the refrigerant. Alternatively, any other type of fluid may be used as long as the fluid is a compressible fluid. Furthermore, the compressor 1 does not need to be used in the refrigeration cycle.

(4) In each of the exemplary embodiments explained above, as in the 2 and 3 is shown, the inner circumferential relief surface 112k is constructed so that the inside catch side internal relief surface 112k is not in contact with the inner peripheral movable shell 123 along the entire height of the stationary shell 112 from the base end 112b to the distal end 112a of the stationary shell 112.

However, this is just an example, and for example, the inner peripheral side internal relief surface 112k may be constructed such that the inner peripheral side internal relief surface 112k does not come into contact with the inner peripheral side movable shell 123 only in a portion of the axial extent of the stationary 112 in the compressor axial direction DRa from the base end 112b to the distal end 112a of the stationary jacket 112 is in contact. More specifically, it is only necessary to construct the inner peripheral side inner relief surface 112k so that the coolant can be guided from the inner peripheral side suction hole 111e to the location of the inner peripheral side inner shoulder 112o regardless of the orbital position of the movable scroll 12. This is also similarly applicable to the outer peripheral inner relief surface 112d.

(5) In each of the exemplary embodiments explained above, as in 1 As shown, the compressor 1 is of the vertical type. Alternatively, the compressor 1 may be of the horizontal type. This means that it is not necessary for the compressor axial direction DRa to coincide with the upward and downward direction DR1 of the compressor 1.

(6) In each of the above-explained embodiments, the second involute curve L2 is the curve offset inwardly from the first involute curve L1, and in 3 the second involute curve L2 is completely offset inwards relative to the first involute curve L1. However, this is just an example. More specifically, it can be said that the second involute curve L2 is offset inwardly relative to the first involute curve L1 even when the second involute curve L2 is partially offset inwardly relative to the first involute curve L1, instead of the second involute curve L2 being entirely relative to the first involute curve L1 is offset inwards. More precisely, it is only necessary that the second involute curve L2 is at least partially (in sections) offset inwards relative to the first involute curve L1.

An example of the sectional (partial) inward displacement of the second involute curve L2 relative to the first involute curve L1 may be a case in which the second involute curve L2 intersects the first involute curve L1. In the case in which the second involute curve L2 intersects the first involute curve L1, the second involute curve L2 is partially offset outwards relative to the first involute curve L1. As a result, the second involute curve L2 is partially offset inwards relative to the first involute curve L1, instead of the second involute curve L2 being completely offset inwards relative to the first involute curve L1.

This is similarly applicable to the relationship between the third involute curve L3 and the fourth involute curve L4, which is shown in 6 are shown. More specifically, it can be said that the fourth involute curve L4 is offset inwardly relative to the third involute curve L3 even when the fourth involute curve L4 is partially (partially) offset inwardly relative to the third involute curve L3, instead of the fourth involute curve L4 is completely (in its entirety) offset inwards relative to the third involute curve L3. More precisely, it is only necessary that the fourth involute curve L4 is at least partially (partially) offset inwards relative to the third involute curve L3.

According to a first aspect shown by a part or the whole of each of the above-explained embodiments, the first shell has: the outer peripheral side inner sliding surface included in the outer peripheral side compression portion and facing an inner side in the radial direction and so constructed is that it is in sliding contact with the second jacket; and the inner peripheral side inner sliding surface included in the inner peripheral side compression portion and facing the inner side in the radial direction and configured to be slidably in contact with the third shell. Furthermore, the first shell has the inner peripheral side inner relief surface included in the inner peripheral side compression portion and facing the inner side in the radial direction and disposed on the outer peripheral side of the inner peripheral side inner sliding surface in the spiral direction. The outer peripheral side inner sliding surface is formed by the portion of the first involute curve, and the inner peripheral side inner sliding surface is formed by the portion of the second involute curve which is inwardly offset (located inwardly) relative to the first involute curve. The inner circumferential inner relief surface is constructed in such a way that it is always spaced from the third casing regardless of the rotational position of the second spiral.

Furthermore, according to a second aspect, the first shell has the outer peripheral side inner relief surface included in the outer peripheral side compression portion and facing the inner side in the radial direction and disposed on the outer peripheral side of the outer peripheral side inner sliding surface in the spiral direction. The inner relief surface on the outer circumference is constructed so that it is always spaced from the second jacket regardless of the orbital position of the second spiral.

Therefore, the compression start timing at which the compression of the fluid of the compression chamber located on the radially outer side of the second shell begins at the outer peripheral compression portion can be adjusted by adjusting the position of the boundary between the outer peripheral inner sliding surface and the outer peripheral inner relief surface . For example, in this way, the compression start time at the compression chamber, which is located on the radially outer side of the second jacket, can be set so that the compression start time at the compression chamber, which is located at the radially outer side of the second jacket, and the compression start time the compression chamber, which is located on the radially inner side of the second jacket, becomes at the same time in the outer circumferential compression section.

Furthermore, according to a third aspect, the second shell has the outer peripheral side outer surface facing the outside in the radial direction and which is configured to be slidably contacted with the outer peripheral inner sliding surface. The third shell has the inner peripheral side outer surface facing the outside in the radial direction and configured to be slidably contacted with the inner peripheral side inner sliding surface. The outer circumferential outer surface is formed by the portion of the third involute curve, and the inner circumferential outer surface is formed by the portion of the fourth involute curve which is offset inward (arranged inside) relative to the third involute curve.

By the above-described configurations, both the second shell and the third shell can be formed according to the difference between the first involute curve forming the outer peripheral side internal sliding surface and the second involute curve forming the inner peripheral side internal sliding surface.

According to a fourth aspect, the first outer circumferential outer surface and the second outer circumferential outer surface are included in the outer circumferential compression portion, while the second outer circumferential outer surface forms the step offset from the first outer circumferential outer surface to the inner side in the radial direction and between the first outer circumferential side Outer surface and the second outer circumferential outer surface. The second shell has: the first outer peripheral side inner surface facing the inner side in the radial direction and configured to be slidably contacted with the first outer peripheral side outer surface; and the second outer peripheral side inner surface facing the inside in the radial direction and configured to be slidably in contact with the second outer peripheral side outer surface. In addition, the first outer peripheral inner surface and the second outer peripheral inner surface form the shoulder which corresponds to the shoulder between the first outer peripheral outer surface and the second outer peripheral outer surface, and which is arranged between the first outer peripheral inner surface and the second outer peripheral inner surface.

Therefore, the wall thickness of the winding start portion of the second jacket can be increased. Thus, the rigidity of the winding start portion, which can be easily deformed, is increased, and thereby the deformation of the second cover can be reduced. Therefore, for example, a further increase in the efficiency of the compressor at the time of compressing the refrigerant is expected.

Furthermore, according to a fifth aspect, the wall thickness of the portion of the second shell that includes the second outer peripheral inner surface is larger than the wall thickness of the portion of the first shell that includes the second outer peripheral surface. Thus, similar to the fourth aspect, the rigidity of the winding start portion is increased, and thereby the deformation of the second shell can be reduced.

Furthermore, according to a sixth aspect, the wall thickness of the section of the second jacket that includes the second outer peripheral inner surface is larger than the wall thickness of the portion of the second jacket that includes the first outer peripheral inner surface. Thus, similar to the fourth aspect, the rigidity of the winding start portion is increased, and thereby the deformation of the second shell can be reduced.

According to a seventh aspect, the second shell has the sealing material formed on the distal end of the second shell and sealing the gap between the distal end of the second shell and the outer peripheral base plate surface. In addition, the second shell has the inner peripheral side portion member which forms the portion of the second shell attached to the inner peripheral side of the shoulder between The first outer circumferential inner surface and the second outer circumferential inner surface are arranged in the spiral direction. The inner peripheral side portion member has the discharge hole opening and closing portion formed at the end portion of the inner peripheral side portion member disposed on the inner peripheral side in the spiral direction and configured to open the outer peripheral side discharge hole in response to the revolving of the second spiral and closes. The sealing material extends to the inner peripheral side portion member and includes the portion located on the outer peripheral side of the discharge hole opening and closing portion of the inner peripheral side portion member in the spiral direction and at the distal end of the second shell offset to the inner side in the radial direction.

In this way, compared to the case where the sealing material at the distal end of the second shell is offset toward the outside in the radial direction of the inner peripheral side portion member, it is possible to reduce the leakage of the fluid passing along the sealing material thereto corresponding part of the width of the distal end of the second jacket flows, where the sealing material is missing. This is so for the following reason. That is, the pressure on the inside of the second shell becomes higher than the pressure on the outside of the second shell, and the sealing material is offset to the inside, which is the high pressure side, so that the sealing material can limit the leakage more effectively. In summary, this is because the leakage cross-sectional area on the high pressure side can be reduced. In this way, at the outer peripheral side compression portion, it is possible to reduce the leakage of the fluid flowing along the sealing material at the corresponding portion of the width of the distal end of the second shell where the sealing material is missing.

Furthermore, according to an eighth aspect, the sealing material has the outer end periphery which is located on the outside of the sealing material in the radial direction and which extends to the opening and closing portion distal end, which is the distal end portion of the second shell included in the dispensing hole opening and closing portion. The outer peripheral side discharge hole is located entirely and always on the inside of the outer end periphery of the sealing material in the radial direction regardless of the orbital position of the second spiral.

Here, when the compression chamber formed on the inside of the second shell and the compression chamber formed on the outside of the second shell are in communication with each other through the outer peripheral discharge hole, the fluid flows from the one of these compression chambers which is the has higher pressure to the other of these compression chambers which has the lower pressure to cause loss of compression of the fluid. In view of this point, according to the eighth aspect, since the outer peripheral side discharge hole does not bridge between the radially outer side and the radially inner side of the second shell, it is possible to prevent the occurrence of communication between the two compression chambers through the outer peripheral side discharge hole. Therefore, it is possible to avoid the increase in loss that would occur if the outer peripheral side discharge hole is constructed to bridge between the radially outer side and the radially inner side of the sealing material.

Furthermore, according to a ninth aspect, the sealing material has the portion offset to the outer side in the radial direction at the opening and closing portion distal end. Therefore, compared to the case where the sealing material at the opening and closing portion distal end is offset to the inner side in the radial direction, the bridging between the radially outer side and the radially inner side of the sealing material can be achieved through the outer peripheral side discharge hole can be limited even more easily.

Furthermore, according to a tenth aspect, the first sheath has the first sealing material located at the distal end of the first sheath and sealing the gap between the distal end of the first sheath and the base plate surface of the second coil. The second shell has the second sealing material disposed at the distal end of the second shell and sealing the gap between the distal end of the second shell and the outer peripheral base plate surface. The third shell has the third sealing material disposed at the distal end of the third shell and sealing the gap between the distal end of the third shell and the inner peripheral base plate surface. Therefore, the sealing materials can limit the leakage of the coolant from the compression chambers formed on the outer peripheral side compression portion and the inner peripheral side compression portion, and thereby the coolant can be efficiently compressed.

Claims (10)

Scroll compressor with: a first scroll (11); and a second spiral (12) which revolves around an axis (C1) orbits relative to the first spiral, wherein: the first spiral comprises: a first shell (112) formed in a spiral shape; and a web (113) connecting between opposing portions of the first shell in a radial direction (DRr) of the axis, thereby defining an outer peripheral compression portion (131) and an inner peripheral compression portion (132); wherein the inner peripheral side compression portion is disposed on an inner peripheral side of the outer peripheral side compression portion in a spiral direction (DRg) which is along the spiral shape of the first shell; wherein in response to the rotation of the second scroll, a fluid is compressed in the outer peripheral side compression portion, and the fluid compressed in the outer peripheral side compression portion is further compressed in the inner peripheral side compression portion; wherein the second spiral has a second shell (122) formed in a spiral shape and disposed on the outer peripheral side compression portion, and a third shell (123) formed in a spiral shape and disposed on the inner peripheral side compression portion; wherein the first shell includes: an outer peripheral side inner sliding surface (112c) included in the outer peripheral side compression portion and facing an inner side in the radial direction and configured to be slidably in contact with the second shell; an inner peripheral side inner sliding surface (112j) included in the inner peripheral side compression portion and facing the inner side in the radial direction and configured to be slidably in contact with the third shell; and an inner peripheral side inner relief surface (112k) included in the inner peripheral side compression portion and facing the inner side in the radial direction and disposed on an outer peripheral side of the inner peripheral side inner sliding surface in the spiral direction; wherein the outer peripheral inner sliding surface is formed by a portion of a first involute curve (L1); wherein the inner peripheral inner sliding surface is formed by a portion of a second involute curve (L2) which is offset inwardly relative to the first involute curve; and wherein the inner circumferential internal relief surface is constructed to always be spaced from the third shell regardless of the orbital position of the second scroll. Scroll compressor according to Claim 1 wherein: the first shell has an outer peripheral side inner relief surface (112d) included in the outer peripheral side compression portion and facing the inner side in the radial direction and disposed on the outer peripheral side of the outer peripheral side inner sliding surface in the spiral direction; and the outer circumferential internal relief surface is constructed to always be spaced apart from the second shell regardless of the orbital position of the second scroll. Scroll compressor according to Claim 1 or 2 wherein: the second shell has an outer peripheral side outer surface (122d) facing an outside in the radial direction and configured to be slidably in contact with the outer peripheral inner sliding surface; the third shell has an inner peripheral side outer surface (123d) facing the outside in the radial direction and configured to be slidably in contact with the inner peripheral side inner sliding surface; the outer peripheral surface is formed by a section of a third involute curve (L3); and the inner circumferential outer surface is formed by a portion of a fourth involute curve (L4) which is offset inwardly relative to the third involute curve. Scroll compressor according to one of the Claims 1 until 3 wherein: the first shell includes a first outer peripheral surface (112f) and a second outer peripheral surface (112g); the first outer peripheral side outer surface is disposed on the outer peripheral side of the second outer peripheral side outer surface in the spiral direction and forms an outer peripheral surface of the first shell which faces the inner peripheral side inner relief surface; the second outer peripheral side outer surface forms an outer peripheral surface of the first shell which faces the inner peripheral side inner sliding surface; the second shell is constructed to be slidably in contact with the first outer peripheral surface and the second outer peripheral surface; the first outer peripheral outer surface and the second outer peripheral outer surface are included in the outer peripheral side compression portion, while the second outer peripheral outer surface forms a shoulder (112h) offset from the first outer peripheral outer surface to the inner side in the radial direction and between the first outer peripheral side Outer surface and the second outer peripheral outer surface is arranged; and the second shell includes: a first outer peripheral inner surface (122g) facing the inner side in the radial direction and configured to be slidably in contact with the first outer peripheral surface; and a second outer peripheral inner surface (122h) facing the inside in the radial direction and configured to be slidably in contact with the second outer peripheral surface; and the first outer circumferential inner circumferential surface and the second outer circumferential inner circumferential surface form a shoulder (122i) which corresponds to the shoulder between the first outer circumferential outer surface and the second outer circumferential outer surface, and which is arranged between the first outer circumferential inner circumferential surface and the second outer circumferential inner circumferential surface. Scroll compressor according to Claim 4 , wherein a wall thickness (T1) of a section (122j) of the second jacket, which includes the second outer peripheral inner surface, is greater than a wall thickness (T3) of a section (112r) of the first jacket, which includes the second outer peripheral surface. Scroll compressor according to Claim 4 , wherein a wall thickness (T1) of a section (122j) of the second jacket, which includes the second outer peripheral inner surface, is greater than a wall thickness (T2) of a section (122k) of the second jacket, which includes the first outer peripheral inner surface. Scroll compressor according to one of the Claims 4 until 6 , wherein: the first spiral has an outer peripheral base plate surface (111a) facing a distal end (122a) of the second shell in an axial direction (DRa) of the axis; the outer peripheral side base plate surface is included in the outer peripheral side compression portion; an outer peripheral side discharge hole (111d) configured to discharge the fluid from the outer peripheral side compression portion to the inner peripheral side compression portion is formed on the outer peripheral side base plate surface; wherein the second shell includes: a sealing material 125 formed at the distal end of the second shell and sealing a clearance (CR2) between the distal end of the second shell and the outer peripheral base plate surface; and an inner peripheral side portion member (122j) constituting a portion of the second shell disposed on the inner peripheral side of the shoulder between the first outer peripheral inner surface and the second outer peripheral inner surface in the spiral direction; and the inner peripheral side portion member has a discharge hole opening and closing portion (122c) formed at an end portion of the inner peripheral side portion member located on the inner peripheral side in the spiral direction and configured to open the outer peripheral side discharge hole in response to the rotation of the second spiral opens and closes; and the sealing material extends to the inner peripheral side portion member and has a portion located on the outer peripheral side of the discharge hole opening and closing portion of the inner peripheral side portion member in the spiral direction and offset at the distal end of the second shell to the inner side in the radial direction. Scroll compressor according to Claim 7 wherein: the sealing material has an outer end periphery (125a) disposed on an outside of the sealing material in the radial direction and extending to an opening-and-closing portion distal end (122m) that is a portion of the distal end of the second shell , which includes in the dispensing hole opening and closing portion; the outer peripheral side discharge hole is located entirely and always on the inside of the outer end periphery of the sealing material in the radial direction regardless of the orbital position of the second spiral. Scroll compressor according to Claim 8 , wherein the sealing material has a portion offset to the outside in the radial direction at the opening and closing portion distal end. Scroll compressor according to one of the Claims 1 until 6 wherein: the first coil includes: an outer peripheral base plate surface (111a) facing a distal end (122a) of the second shell in an axial direction (DRa) of the axis and included in the outer peripheral compression portion; and an inner peripheral side base plate surface (111b) opposed to a distal end (123a) of the third shell in the axial direction and included in the inner peripheral side compression portion; the second spiral has a base plate surface (121a) facing a distal end (112a) of the first shell in the axial direction and facing the outer peripheral compressor sion section and the inner circumferential compression section; the first sheath has a first sealing material (114) disposed at the distal end of the first sheath and sealing a gap (CR1) between the distal end of the first sheath and the base plate surfaces of the second coil; the second shell has a second sealing material (125) disposed at the distal end of the second shell and sealing a gap (CR2) between the distal end of the second shell and the outer peripheral base plate surface; and the third shell has a third sealing material (126) disposed at the distal end of the third shell and sealing a gap (CR3) between the distal end of the third shell and the inner peripheral base plate surface.

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