JP2795021B2 - Scroll compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor, and more particularly to a hermetic scroll compressor.

[0002]

2. Description of the Related Art A conventional scroll compressor of this type is disclosed in, for example, Japanese Utility Model Laid-Open Publication No. 63-196488, and Japanese Patent Application Laid-Open No. 2-57.
No. 87, Japanese Patent Application Laid-Open No. 60-128992 and Japanese Patent Application Laid-Open No. 2-78785 are known. This conventional scroll compressor was configured as shown in FIG. That is, the fixed scroll 1 constituted by projecting the spiral body 1b on the base plate 1a and the oscillating scroll 2 constituted by projecting the spiral body 2b on the base plate 2a similarly have the spiral bodies respectively provided. Are fastened together with the bolts 22 to the sub-frame 6 via the frame 5 so that the orbiting scroll 2 is sandwiched therebetween. The orbiting scroll 2 is supported on the frame 5 via a thrust bearing 11 in the thrust direction. An Oldham coupling 4 is interposed between the base plate 2a of the orbiting scroll 2 and the frame 5 to prevent the orbiting scroll 2 from rotating when rotated. An eccentric hole is opened at one end surface of the main shaft 3, and the main shaft 3 is rotatably connected to a shaft provided at the center of the base plate 2 a of the orbiting scroll 2, and further has a frame at a peripheral portion thereof via a main bearing 12. 5 and is supported on the sub-frame 6 via the sub-bearing 13 at an intermediate portion of the main shaft 3. The frame 5 and the sub-frame 6 are connected to each other by press-fitting (inlaying) cylindrical fitting portions having the same coaxial accuracy with the respective bearings in order to make the main bearing 12 and the sub-bearing 13 coaxial. The rotor of the motor 7 is fixed to the main shaft 3, and the motor stator 14 is fastened to the subframe 6 by bolts 15.

[0003] The internal part assembled in this manner is shrink-fitted and fixed to the inner wall of a sealed container, that is, the shell 8 constituting the outer frame of the scroll compressor at the outer peripheral part of the sub-frame 6. A suction pipe 17 is provided in the shell 8,
The suction pipe 17 is open to the motor side space 19 in the shell. The fixed scroll side shell inner space 20 partitioned by the sub-frame 6 is equalized by the outer peripheral portion of the sub-frame 6 toward the suction space. Reference numeral 18 denotes a discharge pipe, and the discharge port 9 of the fixed scroll 1 is
It is open to. A sealing terminal 16 is provided on the upper end surface of the shell 8 and is connected to the motor 7 by a lead wire. Further, a lubricating oil 21 is stored at the bottom of the shell 8, and an oil pump 10 provided at the other end of the main shaft 3 is immersed.

Next, the operation will be described. Sealed terminal 16
, The motor 7 generates torque, and the main shaft 3 rotates. As a result, the orbiting scroll 2 connected to the main shaft 3
Starts rotating, and the fluid gas starts to compress in cooperation with the fixed scroll 1 by the well-known compression principle of the scroll compressor. At this time, the fluid gas is sucked through the suction pipe 17,
Fixed scroll 1 after flowing into shell space 19, 20
Then, it is sucked into the compression portion formed by the orbiting scroll 2, compressed by the above-described compression principle, and then discharged through the discharge port 9 to the outside of the shell 8 through the discharge pipe 18. Further, when the main shaft 3 rotates, the lubricating oil 21 is sucked by the centrifugal pump action of the oil pump 10, and after being lubricated and lubricated to each of the bearings 11, 12, 13 through the oil supply passage provided in the main shaft 3, gravity causes Return to the bottom of the shell 8 again.

Another conventional scroll compressor is disclosed in Japanese Patent Application No. 2-186181.

[0006]

The conventional scroll compressor has been configured as described above. For example, in order to stably rotate the main shaft, the upper portion of the main shaft is supported by a frame.
When the subframe is installed at the lower end of the shell to support the lower part with the subframe, or when an effective low-pressure compressor is used, the frame shall be fixed to the shell by shrink fitting and sealed. Is desirable. However, when the frame is shrink-fitted into the shell, the frame may be deformed. When the frame is deformed, the thrust support surface that supports the orbiting scroll so as to be able to turn is shown in FIG. 11 from the ideal shape shown in FIG. As a result, the contact surface with the orbiting scroll becomes smaller than the required contact area, increasing the loss of mechanical sliding due to seizure on the thrust support surface and poor lubrication, and the penetration of lubricating oil into the compression chamber There is a possibility that the reliability of the thrust support surface may be significantly reduced, and the orbiting scroll arranged on the thrust support surface may be misaligned relative to the fixed scroll, or the spiral side plate However, there have been problems such as deformation or performance degradation due to leakage.

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems, and a thrust support surface of a frame even when a frame supporting a fixed scroll and an orbiting scroll is fixed to a shell by shrink fitting. An object of the present invention is to provide a scroll compressor which prevents the occurrence of deformation in the scroll compressor and does not cause a decrease in performance due to a decrease in reliability of the thrust support surface or a leak due to an influence on an orbiting scroll or the like.

[0008]

According to a first aspect of the present invention, there is provided a scroll compressor in which a fixed scroll and an orbiting scroll in which a spiral projection such as an involute is projected from a base plate surface are combined with each other, and the orbiting scroll is turned to rotate. A compression mechanism for compressing a fluid in a compression chamber formed by spiral projections of both scrolls and a base plate surface; a motor unit for operating the compression mechanism; and an eccentric shaft for transmitting a driving force of the motor unit to the compression mechanism. A scroll compressor including a main shaft having a portion, a frame fitted to a shell, and having an outer peripheral support surface portion for fixedly supporting the fixed scroll and an inner peripheral thrust support surface for rotatably supporting the orbiting scroll. ,
The frame partitions the inside of the shell into a high-pressure space and a low-pressure space, and seals the high-pressure space and the low-pressure space by being fitted to the shell, and radially outward on the inner peripheral thrust support surface of the frame. A circumferential groove is formed near the boundary with the outer peripheral side support surface.

According to a second aspect of the present invention, there is provided a scroll compressor in which a fixed scroll and an orbiting scroll in which a spiral projection such as an involute is projected from a base plate surface are combined with each other, and the orbiting scroll is turned to make the spiral projections of the two scrolls and A compression mechanism that compresses fluid in a compression chamber formed by the base plate surface, a motor section that operates the compression mechanism, and a main shaft that has an eccentric shaft section that transmits a driving force of the motor section to the compression mechanism. A frame having an outer peripheral support surface fixedly supporting the fixed scroll and a frame having an inner peripheral thrust support surface rotatably supporting the orbiting scroll, wherein the frame comprises the shell the inner is divided into a high pressure space and a low pressure space, as well as sealing the high-pressure space and the low pressure space by the fitted and to the shell, the frame It is composed of a fitted been outer frame around the outer periphery of the inner <br/> over frame and said inner frame having a thrust bearing surface, the inner frame
Between the outer frame and the outer frame.
Radial direction from the fixed scroll mounting surface at the upper end surface of the
The slit is formed so as to be located on the outside .

According to a third aspect of the present invention, there is provided a scroll fluid machine comprising a fixed scroll and an orbiting scroll which form a compression chamber between the spiral portions by combining the spiral portions formed on the base plate, and fixedly support the fixed scroll. A scroll compressor having a frame having a bearing at the center thereof, a crankshaft rotatably supported by the bearing of the frame and applying a rotational force to the orbiting scroll, and a center shell having an electric motor stator. The frame partitions the inside of the compressor into a high-pressure space and a low-pressure space, and seals the high-pressure space and the low-pressure space by being fitted to the center shell, and the center shell is provided on the inner peripheral side of the upper end on the outer peripheral side of the frame. The frame is provided with a stepped portion for engaging and supporting the stepped portion. It is characterized in that it comprises a relief on.

[0011]

According to the scroll compressor of the first aspect, the thrust support surface can be ensured in an ideal state, and various factors such as an increase in mechanical sliding loss due to seizure or poor lubrication on the thrust support surface, or entry of lubricating oil into the compression chamber. Can be prevented from occurring,
Alternatively, the occurrence of relative misalignment of the orbiting scroll with respect to the fixed scroll can be prevented, and the performance of the scroll compressor can be secured.

In the scroll compressor according to the second aspect, even when the frame is fitted to the shell by shrink fitting, the deformation generated in the outer frame is absorbed by the slit and does not reach the flange of the inner frame. Not only deformation of the upper end surface of the flange portion but also the shape and position accuracy of the fixed scroll positioning reamed hole can be ensured. Therefore, the desired positioning accuracy, that is, the combination accuracy of the fixed scroll and the orbiting scroll is remarkably improved, and a high-quality scroll compressor free from liquid leakage or the like can be provided.

According to a third aspect of the present invention, the stepped portion provided on the outer peripheral portion of the frame is engaged and supported by the stepped portion provided on the inner surface of the center shell. By providing a relief portion between the frame and the upper end surface of the frame, the deformation of the frame thrust surface can be minimized, and the inclination of the reamer hole can be made as small as possible.

[0014]

[Embodiment 1] Hereinafter, Embodiment 1 of the present invention will be described in more detail. FIG. 1 is a first embodiment of a scroll compressor according to the present invention.
FIG. In FIG. 1, the same components as those of the conventional scroll compressor are denoted by the same reference numerals, and description thereof will be omitted. In the scroll compressor 30 of this embodiment, a frame 31 is fitted to the upper side of the shell 8 by shrink fitting, and a sub-frame 32 is fitted to the lower side of the shell 8, that is, below the motor 7.

The interior of the shell 8 includes a lower space 19 and an upper space 20.
The space 31 is sealed by shrink-fitting the shell 8 to the two spaces 19 and 20, the lower space immediately inside the motor-side shell inner space 19 is used as a low-pressure space, and the upper space, that is, the fixed scroll-side shell internal space 20 is used as a high-pressure space. I have.
Such a frame 31 has a flat circular recess 31 on the upper surface side.
The swing scroll 2 is rotatably disposed on the thrust support surface 31b of the recess 31a. And
The frame mounting surface of the base plate 1a of the fixed scroll 1 is positioned and fixed to the upper end surface 31d of the peripheral flange 31c that defines the recess 31a.

A circumferential groove 33 is formed on the thrust support surface 31b of the frame 31 at a position along the inner peripheral surface of the recess 31a, that is, along the inner peripheral surface of the flange portion 31c. The circumferential groove 33 has a buffering action for preventing the deformation of the outer peripheral portion of the frame 31, in other words, the flange portion 31c from affecting the thrust support surface 31b.
The frame 31 has a bearing portion 31 formed at the center of the lower surface thereof.
e rotatably supports the upper end of the main shaft 3.
Is rotatably supported by a bearing portion 32a formed at the center of the upper surface of the sub-frame 32. In addition,
Reference numeral 34 denotes a pump element.

According to the scroll compressor 30 of this embodiment having such a frame 31, the frame 31 is shrink-fitted and fixed to the shell 8, but the thrust support surface 31b
Is formed with a circumferential groove 33 at a position along the inner peripheral surface of the flange portion 31c.
Even if the first flange portion 31c is deformed and the inner peripheral surface of this flange portion is deformed, the outer peripheral portion of the circumferential groove 33 is only deformed, and the thrust support surface 31b located inside thereof is not deformed. . This is because the circumferential groove 33 absorbs the deformation of the flange portion 31c and prevents the radially inward spread of the deformation from the portion, and in that sense, the groove width of the circumferential groove 33 is It is necessary to ensure that it is sufficient for the expected deformation amount. As a result, the thrust support surface 31b can be secured in an ideal state as shown in FIG.
b) It is possible to prevent the occurrence of various problems such as an increase in mechanical sliding loss due to seizure or poor lubrication, or the entry of lubricating oil into the compression chamber, or the relative misalignment of the orbiting scroll with respect to the fixed scroll. Can be prevented, and the performance of the scroll compressor can be ensured.

Embodiment 2 FIG. FIG. 2 shows a scroll compressor 40 according to Embodiment 2 of the present invention.
FIG. In the scroll compressor 40 according to the second embodiment, the frame 41 is
And an outer frame 43 fitted thereto. As shown in FIG. 3, the inner frame 42 has a flat circular recess 42a on the upper surface side, and the inner surface thereof is a thrust support surface 42b that supports the orbiting scroll 2 to be able to turn. A notch, that is, a reduced diameter portion 42c is formed on the entire outer circumference of the flange 42c that defines the recess 42a from the upper end 42d to a predetermined axial length. On the other hand, the outer frame 43 is also a cylindrical body, as is apparent from FIG. 3, and has a shrink fit portion 43a having a larger outer diameter formed at the upper part of the outer peripheral surface. The outer frame 43 is fitted to the outer peripheral portion of the inner frame 42 by shrink fitting as shown in FIG. 4, whereby the reduced-diameter portion 42e of the inner frame 42 appears as a slit. .

As described above, the frame 41 is divided into the inner frame 42 and the outer frame 43, which are shrink-fitted to each other and shrink-fitted radially outward from the fixed scroll mounting surface at the upper end surface 42d of the flange portion 42c to absorb distortion. Forming the slit 44 for use has the following advantages. That is, generally, a reaming hole for positioning when the fixed scroll 1 is fixed is formed on the upper end surface of the flange portion of the frame, and the reaming hole is deformed or deformed by the deformation generated when the frame is shrink-fitted to the shell 8. In order to effectively prevent this, a special machining tool is required for machining a relatively deep slit, and is not suitable for mass production. However, according to the frame 41 of the scroll compressor 40 as in the above-described embodiment, a relatively deep slit 44 can be formed very easily, and furthermore, after the outer frame 43 is shrink-fitted to the inner frame 42, If the reamed hole 42f is formed in the upper end surface of the flange portion 42c, that is, the fixed scroll mounting surface, and the finishing process is performed, the inconvenience due to the distortion deformation generated in the flange upper end surface 42d when the outer frame 43 is shrink-fitted can be completely eliminated. . The frame 41 thus formed
Is fitted to the shell 8 by shrink fitting.

The scroll compressor 4 according to the second embodiment
According to No. 0, even if the frame 41 is fitted to the shell 8 by shrink fitting, the deformation generated in the outer frame 43 is absorbed by the slits 44 and the flange 42 c of the inner frame 42.
As a result, it is possible to prevent not only the deformation of the thrust support surface 42b but also the deformation of the upper end surface of the flange portion 42c, and the shape and position accuracy of the fixed scroll positioning reamer hole 42f can be ensured. Therefore, the desired positioning accuracy, that is, the combination accuracy of the fixed scroll and the orbiting scroll is remarkably improved, and a high-quality scroll compressor free from liquid leakage or the like can be provided.

Embodiment 3 FIG. In the scroll compressor 40 according to the second embodiment, the case where the inner frame 42 and the outer frame 43 are fitted to each other to obtain the slit 44 for shrink-fitting distortion absorption is shown in FIGS. 5 and 6. Thus, the outer frame 53 may be fitted to the inner frame 52 having no reduced diameter portion on the outer peripheral surface so that no slit is formed. However, in this case, the outer frame 53
Is made of a metal which is apt to be deformed, for example, beryllium copper or phosphor bronze having excellent spring properties. When the frame 51 is shrink-fitted into the shell 8, the outer frame 53 is positively deformed, and It is necessary that the seal between the frame 51 and the inner frame 52 be sufficiently performed and the inner frame 52 be fixed. When using such an outer frame 53, the inner frame 5
2 may be press-fitted. As described above, if the outer frame 53 is made of a metal which is liable to be deformed by distortion, even if the slit as in the second embodiment is not provided, the distortion of the thrust support surface 52a of the inner frame 52 and the upper end surface 52c of the flange 52b, etc. Deformation can be suppressed.

Embodiment 4 FIG. Hereinafter, a fourth embodiment of the present invention will be described with reference to the drawings. In FIG. 7, 31e is an outer peripheral portion of the shrink fitting step provided on the frame 31, 31f is a positioning end of the shrink fitting step provided on the frame 31, 31g is an upper end surface of the frame, and 31h is a reaming hole provided on the frame 31. , 8a are steps for positioning the shrink fit provided on the center shell 8, 65 is a reamer pin, 6
Reference numeral 6 denotes an upper end escape portion for the shrink fitting step provided on the frame 31.

As shown in FIG. 7, the change of the reamed hole 31h when the upper end relief 66 is provided in the frame fitting portion is deformed as shown in FIG. 8 based on the test and calculation results. By providing the upper end relief 66 after the shrink fitting to the shape before shrink fitting, the reaming hole pitch is reduced.
The inclination of 1h is improved, and the reamed hole 31h is deformed so as to move in parallel to the axial direction. Therefore, if the pitch of the reamer holes 1c provided in the fixed scroll 1 is set smaller than the pitch of the reamer holes 31h of the frame by the amount of deformation in advance, the reamer pins 65 can be inserted even if the frame 31 is deformed by shrink fitting, and It is possible to assemble in a state where the fixed scroll 1 is positioned. Further, since the shrink-fit position is located above the frame thrust surface 31b, deformation of the thrust surface 31b is minimized.

[0024]

According to a first aspect of the present invention, there is provided a scroll compressor wherein a fixed scroll and an orbiting scroll in which a spiral projection such as an involute projects from a base plate surface are combined with each other, and the orbiting scroll is turned to form a spiral of the two scrolls. A main shaft having a compression mechanism for compressing a fluid in a compression chamber formed by the projection and the base plate surface, a motor section for operating the compression mechanism, and an eccentric shaft section for transmitting a driving force of the motor section to the compression mechanism; And a frame fitted to a shell and having an outer peripheral support surface portion for fixedly supporting the fixed scroll and an inner peripheral thrust support surface for rotatably supporting the oscillating scroll. The inside of the shell is partitioned into a high-pressure space and a low-pressure space, and the high-pressure space and the low-pressure space are sealed by being fitted to the shell, and the frame is sealed. A circumferential groove is formed near the boundary between the inner peripheral thrust support surface and the outer peripheral support surface in the radial direction on the inner peripheral side, so that the deformation of the thrust support surface of the frame that supports the orbiting scroll can be prevented. Thus, a scroll compressor having high performance and high reliability can be provided.

According to a second aspect of the present invention, there is provided a scroll compressor wherein a fixed scroll and an orbiting scroll in which a spiral projection such as an involute is projected from a base plate surface are combined with each other, and the orbiting scroll is turned to form a spiral projection with the scroll projections of both scrolls. A compression mechanism that compresses fluid in a compression chamber formed by the base plate surface, a motor section that operates the compression mechanism, and a main shaft that has an eccentric shaft section that transmits a driving force of the motor section to the compression mechanism. A frame having an outer peripheral support surface fixedly supporting the fixed scroll and a frame having an inner peripheral thrust support surface rotatably supporting the orbiting scroll, wherein the frame comprises the shell the inner is divided into a high pressure space and a low pressure space, as well as sealing the high-pressure space and the low pressure space by the fitted and to the shell, the frame It is composed of a fitted been outer frame around the outer periphery of the inner <br/> over frame and said inner frame having a thrust bearing surface, the inner frame
Between the outer frame and the outer frame.
Radial direction from the fixed scroll mounting surface at the upper end surface of the
Since the slits positioned outside are formed , the desired positioning accuracy of the fixed scroll and the orbiting scroll, that is, the combination accuracy is remarkably improved, and a high-quality scroll compressor without liquid leakage or the like can be provided.

A scroll compressor according to a third aspect of the present invention includes a fixed scroll and an orbiting scroll which form a compression chamber between the spiral portions by combining the spiral portions formed on the base plate.
A frame that fixedly supports the fixed scroll and has a bearing at the center, a crankshaft rotatably supported by the bearing of the frame and applying a rotational force to the orbiting scroll, and a center shell having an electric motor stator. In the scroll compressor provided, the frame partitions the inside of the compressor into a high-pressure space and a low-pressure space, and seals the high-pressure space and the low-pressure space by being fitted to the center shell, and the center shell is located on the inner peripheral side at the upper end. The frame has a stepped portion for engaging and supporting a stepped portion provided on the outer peripheral side, and the frame has a relief between a counter-engagement support side and an upper end surface of the stepped portion provided on the outer peripheral portion. So, even if the frame is deformed by shrink fitting, the inclination of the reamed hole can be within the clearance of the reamed hole and the set reamed hole pitch, One since the deformation of the thrust surface can be minimized, even if the frame is deformed by shrinkage fit assembly possible, and reliable compressor can be obtained.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view showing a scroll compressor according to Embodiment 1 of the present invention.

FIG. 2 is a longitudinal sectional view showing a scroll compressor according to Embodiment 2 of the present invention.

FIG. 3 is a cross-sectional view showing a state before an outer frame of a frame in a scroll compressor according to Embodiment 2 of the present invention is fitted to an inner frame.

FIG. 4 is a cross-sectional view of a frame in which an outer frame and an inner frame of a scroll compressor according to Embodiment 2 of the present invention are fitted, and a reamed hole is formed in an upper end surface of a flange portion of the inner frame.

FIG. 5 is a sectional view of a frame of a scroll compressor according to Embodiment 3 of the present invention.

FIG. 6 is a cross-sectional view of a frame formed by fitting an outer frame and an inner frame of a scroll compressor according to Embodiment 3 of the present invention.

FIG. 7 is a partial sectional view of a scroll compressor according to Embodiment 4 of the present invention.

FIG. 8 is a schematic diagram showing deformation of a frame before and after shrink-fitting when an upper end relief is provided in a frame shrink-fitting step portion of a scroll compressor according to Embodiment 4 of the present invention.

FIG. 9 is a sectional view showing a conventional scroll compressor.

FIG. 10 is a configuration explanatory view showing an ideal state in which a swing scroll is supported by a thrust support surface of a frame in a conventional scroll compressor.

FIG. 11 is a configuration explanatory view showing a state in which the orbiting scroll is supported in a state where the thrust support surface of the frame is deformed in the conventional scroll compressor.

[Explanation of symbols]

 Reference Signs List 1 fixed scroll 1a base plate 1b spiral projection 2 swinging scroll 2a base plate 2b spiral projection 3 main shaft 7 motor 8 shell 30 scroll compressor 31 frame 31a recess 31b thrust support surface 31c flange 31d flange upper surface 31e frame baking Outer peripheral portion 31f Frame shrink fit step portion positioning portion 31g Frame shrink fit step portion outer peripheral portion 31h Frame reamer hole 33 Circumferential groove 41 Frame 42 Inner frame 43 Outer frame 44 Slit 51 Frame 52 Inner frame 53 Outer frame 65 Reamer pin 66 Frame shrink fit escape

──────────────────────────────────────────────────続 き Continuing on the front page (72) Katsuyoshi Wada, Inventor, 3-18-1, Oga, Shizuoka-shi Mitsubishi Electric Corporation Shizuoka Works (72) Inventor, Fumiaki Sano 3-1-1, Oka, Shizuoka-shi Mitsubishi Electric Corporation Inside Shizuoka Works (72) Inventor Takashi Yamamoto 3-181-1, Oka, Shizuoka-shi Mitsubishi Electric Corporation Inside Shizuoka Works (72) Inventor Tatsuya Sugita 3-181, Oka Shizuoka-shi Mitsubishi Electric Corporation Inside Shizuoka Works (72) Inventor Norihide Kobayashi 3-18-1 Oka, Shizuoka-shi Mitsubishi Electric Corporation Shizuoka Works (56) References JP-A-4-164181 (JP, A) JP-A-2-19674 (JP, A) JP-A-3-15686 (JP, A) JP-A-2-86977 (JP, A) JP-A-63-309793 (JP, A) JP-A-64-12088 (JP, A) 62-1262 05 (JP, A) Shokai Sho 63-196488 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F04C 18/02 311 F04C 29/00

Claims (3)

(57) [Claims] 1. A fixed scroll and an orbiting scroll in which spiral projections such as involutes project from a base plate surface are combined with each other, and the orbiting scroll is turned to form the spiral projections of both scrolls and the base plate surface. A compression mechanism that compresses fluid in a compression chamber, a motor section that operates the compression mechanism, a main shaft having an eccentric shaft section that transmits a driving force of the motor section to the compression mechanism, In a scroll compressor comprising: a frame having an outer peripheral support surface portion for fixedly supporting a fixed scroll and an inner peripheral thrust support surface for rotatably supporting the orbiting scroll, the frame includes a high-pressure space and a low-pressure space in the shell. The high-pressure space and the low-pressure space are sealed by fitting to the shell, and the inner peripheral thrust support surface of the frame is A scroll compressor characterized in that a circumferential groove is formed in the vicinity of a boundary with the outer peripheral side support surface in a radially outward direction. 2. A fixed scroll and an orbiting scroll in which a spiral projection such as an involute is projected from a base plate surface are combined with each other, and the orbiting scroll is turned to form a spiral projection of both scrolls and a base plate surface. A compression mechanism that compresses fluid in a compression chamber, a motor section that operates the compression mechanism, a main shaft having an eccentric shaft section that transmits a driving force of the motor section to the compression mechanism, In a scroll compressor including a frame having an outer peripheral support surface for fixedly supporting a fixed scroll and an inner peripheral thrust support surface for rotatably supporting the orbiting scroll, the frame includes a high-pressure space and a low-pressure space in the shell. The high-pressure space and the low-pressure space are sealed by fitting to the shell, and the frame is
An inner frame having a supporting surface and an outer frame fitted around the outer periphery of the inner frame.
The fixed screw on the upper end surface of the flange of the inner frame
Slits located radially outside the roll mounting surface
A scroll compressor characterized by forming . 3. A fixed scroll and an orbiting scroll which form a compression chamber between the spiral portions by combining the spiral portions formed on the base plate, and the fixed scroll is fixedly supported and has a bearing at the center. In a scroll compressor including a frame, a crankshaft rotatably supported by bearings of the frame and applying a rotational force to an orbiting scroll, and a center shell having an electric motor stator, the frame has a high pressure inside the compressor. The space is divided into a space and a low-pressure space, and the high-pressure space and the low-pressure space are sealed by being fitted to the center shell, and the center shell engages and supports a stepped portion provided on the inner peripheral side of the upper end on the outer peripheral side of the frame. Wherein the frame has a relief between the anti-engagement support side of the stepped portion provided on the outer peripheral portion and the upper end surface. Scroll compressor.