JP2020148114A - Scroll compressor - Google Patents

Abstract

To provide a scroll compressor which eliminates a disadvantage that excessive back pressure increases power consumption without causing increase in its axial direction.SOLUTION: A scroll compressor includes: a back pressure chamber 39 formed on a back surface of a panel 31 of a movable scroll 22; a back pressure passage 43 allowing the discharge side of a compression mechanism 4 and the back pressure chamber 39 to communicate with each other; a rotary shaft 14 which drives the movable scroll; an oil passage 46 formed within the rotary shaft 14; and an inlet hole 52 which opens on a movable scroll 22 side end surface of the rotary shaft and allows the back pressure chamber 39 and the oil passage 46 to communicate with each other. A recessed part 53 is formed at the movable scroll 22 side end surface of the rotary shaft 14 and the inlet hole 52 opens in the recessed part 53.SELECTED DRAWING: Figure 1

Description

The present invention relates to a scroll compressor that compresses a working fluid in a compression chamber formed between laps of both scrolls by revolving a movable scroll with respect to a fixed scroll.

Conventionally, this type of scroll compressor has a compression mechanism consisting of a fixed scroll having a spiral wrap on the surface of the end plate and a movable scroll having a spiral wrap on the surface of the end plate, and the laps of each scroll are opposed to each other. A compression chamber is formed between the laps, and the movable scroll is revolved around the fixed scroll by a motor to compress the working fluid (refrigerant) in the compression chamber.

In this case, a back pressure chamber for pressing the movable scroll against the fixed scroll is formed on the back surface of the end plate of the movable scroll against the compression reaction force from the compression chamber. Conventionally, a back pressure passage connecting the discharge side (discharge space) of the compression mechanism and the back pressure chamber is formed, and by arranging an orifice in this back pressure passage, the discharge pressure after being adjusted by the orifice is back pressure. A back pressure load that is supplied to the chamber and overcomes the compression reaction force is applied to the movable scroll (see, for example, Patent Document 1).

JP-A-2017-166366

Here, oil flows into the back pressure chamber from the discharge side of the compression mechanism through the back pressure passage. Then, this oil flows into the oil passage formed in the rotating shaft from the inlet hole formed on the end face on the movable scroll side of the rotating shaft, and is supplied from this oil passage to the front bearing supporting the rotating shaft.

Finally, it returns to the inside of the housing, but especially when it is operated at a high rotation speed, the difference between the discharge pressure and the back pressure becomes large, so that it enters the back pressure chamber via the orifice of the back pressure passage. The amount of flowing oil increases. On the other hand, the inlet hole of the rotating shaft is partially blocked by the eccentric bush that fits in the boss of the movable scroll. Therefore, when the amount of oil flowing into the back pressure chamber increases, the oil flows from the back pressure chamber. There was a problem that the back pressure became high and the movable scroll was excessively pressed against the fixed scroll, resulting in an increase in power consumption.

Further, in order to solve this problem, it is conceivable to expand the structure around the inlet hole in the axial direction of the rotation shaft to facilitate the oil flowing into the inlet hole, but in that case, the axial dimension (axial length) is increased. The problem of expansion arises.

The present invention has been made to solve the above-mentioned conventional technical problems, and scroll compression that eliminates the inconvenience that power consumption increases due to excessive back pressure without inviting axial dimensional expansion. The purpose is to provide an opportunity.

In order to solve the above problems, the scroll compressor of the present invention includes a compression mechanism consisting of a fixed scroll and a movable scroll in which spiral wraps are formed facing each other on each surface of each end plate, and the movable scroll is fixed. The working fluid is compressed in the compression chamber formed between each lap of both scrolls by revolving and turning with respect to the scroll, and the back pressure chamber formed on the back surface of the end plate of the movable scroll and the compression chamber. Opened at the back pressure passage that communicates the discharge side of the mechanism and the back pressure chamber, the rotation shaft that drives the movable scroll, the oil passage formed in the rotation shaft, and the end face of the rotation shaft on the movable scroll side. It is characterized in that it is provided with an inlet hole for communicating the back pressure chamber and the oil passage, a recess is formed on the end surface of the rotating shaft on the movable scroll side, and the inlet hole is opened in the recess.

The scroll compressor according to claim 2 is characterized in that, in the above invention, the scroll compressor includes a bearing member that supports the rotating shaft, and oil is supplied to the bearing member from the oil passage of the rotating shaft.

The scroll compressor according to the third aspect of the present invention is characterized in that the back pressure passage is provided with an orifice in each of the above inventions.

The scroll compressor according to the fourth aspect of the present invention has an eccentric bush provided eccentrically from the axis at the boss portion formed on the back surface of the end plate of the movable scroll and the end portion on the movable scroll side of the rotating shaft in each of the above inventions. The eccentric bush is fitted to the boss portion and has a positional relationship corresponding to at least a part of the inlet hole.

In the scroll compressor of the invention of claim 5, the end face of the rotary shaft on the movable scroll side is provided with a drive protrusion protruding at a position eccentric from the axial center of the rotary shaft. It is characterized in that it is movably attached to a drive protrusion.

The scroll compressor of the invention of claim 6 is characterized in that, in each of the above inventions, the recesses have a groove shape extending between both ends of the rotating shaft on the movable scroll side in the radial direction. To do.

According to the present invention, a compression mechanism consisting of a fixed scroll and a movable scroll in which spiral wraps are formed so as to face each other on each surface of each end plate is provided, and the movable scroll is revolved and swirled with respect to the fixed scroll. In a scroll compressor that compresses the working fluid in a compression chamber formed between the laps of both scrolls, the back pressure chamber formed on the back surface of the end plate of the movable scroll, and the discharge side and back pressure chamber of the compression mechanism are separated. The back pressure passage that communicates, the rotation shaft that drives the movable scroll, the oil passage formed in this rotation shaft, and the end face of the rotation shaft on the movable scroll side are opened to communicate the back pressure chamber and the oil passage. A recess is formed on the end face of the rotating shaft on the movable scroll side so that the inlet hole opens in the recess, so that the back pressure chamber is provided without enlarging the axial dimension. The oil that has flowed into the space can smoothly flow into the inlet hole through the recess.

In particular, as in the case of the inventions of claims 4 and 5, when the eccentric bush attached to the drive projection of the rotating shaft and fitted to the boss portion of the movable scroll has a positional relationship corresponding to at least a part of the inlet hole. However, the oil can flow into the inlet hole without any trouble through the recess.

As a result, when the discharge pressure adjusted by the orifice of the back pressure passage is supplied to the back pressure chamber as in the invention of claim 3, even if a large amount of oil flows into the back pressure chamber at high rotation speed. , It is possible to prevent the oil from getting stuck in the oil passage from the inlet hole, and eliminate the inconvenience that the back pressure becomes high and the movable scroll is excessively pressed against the fixed scroll, resulting in increased power consumption. You will be able to.

Further, when the oil is supplied to the bearing member from the oil passage as in the invention of claim 2, the oil can be smoothly supplied to the bearing member, and the inconvenience of seizure or the like is eliminated.

Further, as in the invention of claim 6, if the recess is formed into a groove shape on the end face on the movable scroll side of the rotating shaft so as to extend between both ends of the rotating shaft in the radial direction, oil can also be formed from the end face in the radial direction of the rotating shaft. Can enter the recess and flow into the inlet hole, allowing the oil in the back pressure chamber to escape more smoothly into the oil passage of the rotating shaft, and power consumption due to excessive back pressure. It will be possible to eliminate the increase in the number more reliably.

It is sectional drawing of the scroll compressor of one Embodiment to which this invention was applied. It is a figure which looked at the compression mechanism housing of the scroll compressor of FIG. 1 from the compression mechanism cover side (excluding the compression mechanism). It is a perspective view of the rotation axis of the scroll compressor of FIG. It is a figure which shows the end face on the movable scroll side of the rotation axis of FIG.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view of a scroll compressor 1 of an embodiment to which the present invention is applied. The scroll compressor 1 of the embodiment is used, for example, in a refrigerant circuit of a vehicle air conditioner, and sucks, compresses, and discharges a refrigerant as a working fluid of the vehicle air conditioner, and together with an electric motor 2. This is a so-called inverter-integrated scroll compressor including an inverter 3 for operating the electric motor 2 and a compression mechanism 4 driven by the electric motor 2.

The scroll compressor 1 of the embodiment includes a main housing 6 that houses an electric motor 2 and an inverter 3 inside, a compression mechanism housing 7 that houses a compression mechanism 4 inside, an inverter cover 8, and a compression mechanism cover 9. It has. The main housing 6, the compression mechanism housing 7, the inverter cover 8, and the compression mechanism cover 9 are all made of metal (made of aluminum in the embodiment), and they are integrally joined to the scroll compressor 1. Housing 11 is configured.

The main housing 6 is composed of a tubular peripheral wall portion 6A and a partition wall portion 6B. The partition wall portion 6B is a partition wall that partitions the inside of the main housing 6 into a motor accommodating portion 12 accommodating the electric motor 2 and an inverter accommodating portion 13 accommodating the inverter 3. One end surface of the inverter accommodating portion 13 is open, and this opening is closed by the inverter cover 8 after the inverter 3 is accommodated.

The other end surface of the motor accommodating portion 12 is also open, and this opening is closed by the compression mechanism housing 7 after the electric motor 2 is accommodated. The partition wall portion 6B is provided with a support portion 16 for supporting one end portion (the end portion on the opposite side of the compression mechanism 4) of the rotating shaft 14 of the electric motor 2.

The compression mechanism housing 7 has an opening on the side opposite to the main housing 6, and this opening is closed by the compression mechanism cover 9 after the compression mechanism 4 is accommodated. The compression mechanism housing 7 is composed of a tubular peripheral wall portion 7A and a frame portion 7B on one end side (main housing 6 side) thereof, and the compression mechanism 4 is contained in a space partitioned by the peripheral wall portion 7A and the frame portion 7B. Is housed. The frame portion 7B forms a partition wall that separates the inside of the main housing 6 from the inside of the compression mechanism housing 7.

Further, the frame portion 7B is provided with a through hole 17 through which the other end of the rotating shaft 14 of the electric motor 2 (the end on the compression mechanism 4 side) is inserted, and the through hole 17 is provided on the compression mechanism 4 side. A front bearing 18 as a bearing member that supports the other end of the rotating shaft 14 is fitted. Reference numeral 19 denotes a sealing material that seals the outer peripheral surface of the rotating shaft 14 and the inside of the compression mechanism housing 7 at the through hole 17.

The electric motor 2 is composed of a stator 25 around which a coil 35 is wound and a rotor 30. Then, for example, the direct current from the vehicle battery (not shown) is converted into a three-phase alternating current by the inverter 3 and supplied to the coil 35 of the electric motor 2, so that the rotor 30 is rotationally driven. ing.

Further, a suction port (not shown) is formed in the main housing 6, and after the refrigerant sucked from the suction port passes through the main housing 6, the outside of the compression mechanism 4 in the compression mechanism housing 7 will be described later. It is sucked into the suction unit 37. As a result, the electric motor 2 is cooled by the intake refrigerant. Further, the refrigerant compressed by the compression mechanism 4 is configured to be discharged from a discharge space 27 described later as a discharge side of the compression mechanism 4 from a discharge port (not shown) formed on the compression mechanism cover 9.

The compression mechanism 4 is composed of a fixed scroll 21 and a movable scroll 22. The fixed scroll 21 integrally includes a disk-shaped end plate 23 and an involute-shaped or spiral wrap 24 having a curved line similar thereto standing on the surface (one surface) of the end plate 23. The surface of the end plate 23 on which the wrap 24 is erected is fixed to the compression mechanism housing 7 with the frame portion 7B side as the side. A discharge hole 26 is formed in the center of the end plate 23 of the fixed scroll 21, and the discharge hole 26 communicates with the discharge space 27 in the compression mechanism cover 9. Reference numeral 28 denotes a discharge valve provided in the opening on the back surface (the other surface) side of the end plate 23 of the discharge hole 26.

The movable scroll 22 is a scroll that revolves and turns with respect to the fixed scroll 21, and has a disk-shaped end plate 31 and an involute shape erected on the surface (one surface) of the end plate 31 or an approximation thereof. A spiral wrap 32 made of a curved line and a boss portion 33 protruding from the center of the back surface (the other surface) of the end plate 31 are integrally provided. The movable scroll 22 is arranged so that the lap 32 faces the lap 24 of the fixed scroll 21 and meshes with each other with the protruding direction of the lap 32 as the fixed scroll 21 side, and the compression chamber 34 is provided between the laps 24 and 32. To form.

That is, the lap 32 of the movable scroll 22 faces the lap 24 of the fixed scroll 21, and the tip of the lap 32 is in contact with the surface of the end plate 23, and the tip of the lap 24 is in contact with the surface of the end plate 31. At the other end of the rotating shaft 14, that is, the end on the movable scroll 22 side, a columnar driving protrusion 48 projecting at a position eccentric from the axial center of the rotating shaft 14 is provided. A columnar eccentric bush 36 is also rotatably attached to the drive projection 48, and is provided at the other end of the rotary shaft 14 eccentrically from the axial center of the rotary shaft 14.

In this case, the eccentric bush 36 is attached to the drive projection 48 at a position eccentric from the axial center of the eccentric bush 36, and the eccentric bush 36 is fitted to the boss portion 33 of the movable scroll 22. Then, when the rotating shaft 14 is rotated together with the rotor 30 of the electric motor 2, the movable scroll 22 is configured to revolve around the fixed scroll 21 without rotating. Reference numeral 49 denotes a balance weight attached to the outer peripheral surface of the rotating shaft 14 on the movable scroll 22 side of the front bearing 18.

Since the movable scroll 22 revolves eccentrically with respect to the fixed scroll 21, the eccentric direction and the contact position of each of the laps 24 and 32 move while rotating, and the compression chamber 34 sucking the refrigerant from the above-mentioned suction portion 37 on the outside. Gradually shrinks while moving inward. As a result, the refrigerant is compressed and finally discharged from the central discharge hole 26 to the discharge space 27 via the discharge valve 28.

In FIG. 1, 38 is an annular thrust plate. The thrust plate 38 is for partitioning the back pressure chamber 39 formed on the back surface side of the end plate 31 of the movable scroll 22 and the suction portion 37 as the suction pressure region outside the compression mechanism 4 in the compression mechanism housing 7. It is located outside the boss portion 33 and is interposed between the frame portion 7B and the movable scroll 22. Reference numeral 41 denotes a sealing material attached to the back surface of the end plate 31 of the movable scroll 22 and abutting against the thrust plate 38, and the back pressure chamber 39 and the suction portion 37 are partitioned by the sealing material 41 and the thrust plate 38.

Reference numeral 42 denotes a sealing material which is attached to the surface of the frame portion 7B on the thrust plate 38 side, abuts on the outer peripheral portion of the thrust plate 38, and seals between the frame portion 7B and the thrust plate 38.

Further, in FIG. 1, reference numeral 43 denotes a back pressure passage formed from the compression mechanism cover 9 to the compression mechanism housing 7, and an orifice 44 is installed in the back pressure passage 43. The back pressure passage 43 communicates with the inside of the discharge space 27 (the discharge side of the compression mechanism 4) in the compression mechanism cover 9 and the back pressure chamber 39, whereby the back pressure chamber 39 is connected to the back pressure chamber 39 as shown by an arrow in FIG. The discharge pressure adjusted to be reduced by the orifice 44 is mainly supplied with oil.

The pressure (back pressure) in the back pressure chamber 39 creates a back pressure load that presses the movable scroll 22 against the fixed scroll 21. Due to this back pressure load, the movable scroll 22 is pressed against the fixed scroll 21 against the compression reaction force from the compression chamber 34 of the compression mechanism 4, and the contact between the laps 24 and 32 and the end plates 31 and 23 is maintained and compressed. The refrigerant can be compressed in the chamber 34.

On the other hand, an oil passage 46 extending in the axial direction is formed in the rotating shaft 14. Further, an inlet hole 52 is formed on the other end surface of the rotating shaft 14, that is, the end surface on the movable scroll 22 side, and the back pressure chamber 39 and the oil passage 46 are communicated with each other by the inlet hole 52. Further, in the oil passage 46, a pressure adjusting valve 47 is provided located on the support portion 16 side.

The oil passage 46 communicates between the back pressure chamber 39 and the inside of the main housing 6 (inhalation pressure region) via the inlet hole 52, and the oil flowing into the back pressure chamber 39 from the back pressure passage 43 flows into the back pressure chamber 32. The pressure regulating valve 47 opens when the pressure (back pressure) in the back pressure chamber 39 reaches the maximum value, and the back pressure increases further. It works so that it does not rise.

Further, a branch passage 51 is formed on the rotating shaft 14 at a position corresponding to the front bearing 18. The branch passage 51 has a function of supplying a part of the oil flowing into the oil passage 46 to the front bearing 18 by communicating the oil passage 46 and the front bearing 18.

Next, the structure around the inlet hole 52 formed in the rotating shaft 14 will be described in detail with reference to FIGS. 2 to 4. FIG. 2 is a view of the compression mechanism housing 7 of the scroll compressor 1 as viewed from the compression mechanism cover 9 side. However, the compression mechanism 4 and the thrust plate 38 are in a removed state. Further, FIG. 3 is a perspective view of the above-mentioned rotating shaft 14 as viewed from the other end side (movable scroll 22 side), and FIG. 4 is a view showing the other end surface of the rotating shaft 14 (end surface on the movable scroll 22 side). In addition, in FIG. 3 and FIG. 4, the eccentric bush 36 is removed.

In the present invention, a recess 53 is notched on the other end surface of the rotating shaft 14, that is, the end surface on the movable scroll 22 side, and the inlet hole 52 is opened in the recess 53. In the embodiment, as shown in FIGS. 2 to 4, the recess 53 has a groove shape extending between both ends of the rotating shaft 14 in the radial direction at a position avoiding the drive protrusion 48.

As described above, the eccentric bush 36 is rotatably attached to the drive projection 48 of the rotating shaft 14, and when the eccentric bush 36 is rotationally moved toward the inlet hole 52 as shown in FIGS. 1 and 2, the eccentric bush 36 is rotatably moved. At least a part of 36 has a positional relationship corresponding to the inlet hole 52. Therefore, if the recess 53 described above is not formed, at least a part of the inlet hole 52 is blocked by the eccentric bush 36, and the opening area of the inlet hole 52 in the thrust direction of the rotating shaft 14 becomes extremely small. (Fig. 1, Fig. 2).

Here, especially when the discharge pressure after the pressure is adjusted by the orifice 44 of the back pressure passage 43 is supplied to the back pressure chamber 39 and the back pressure load is applied to the movable scroll 22 as in the scroll compressor 1 of the embodiment. When operated at a high speed, the difference between the discharge pressure and the back pressure becomes large, so that the amount of oil flowing into the back pressure chamber 39 through the orifice 44 increases. Therefore, in a situation where a part of the inlet hole 52 is blocked by the eccentric bush 36, if the amount of oil flowing into the back pressure chamber 39 increases, the oil cannot completely escape from the back pressure chamber 39 to the oil passage 46, and the back pressure Will be high and the movable scroll 22 will be excessively pressed against the fixed scroll 21.

However, in the present invention, as described above, the recess 53 is notched in the end surface of the rotary shaft 14 on the movable scroll 22 side, and the inlet hole 52 is opened in the recess 53, so that the thrust direction of the rotary shaft 14 Even if the eccentric bush 36 has a positional relationship corresponding to the inlet hole 52 when viewed from the above, oil flows into the recess 53 through the gap between the eccentric bush 36 and the recess 53, and passes through the recess 53. Oil also flows into the inlet hole 52.

In particular, when a groove-shaped recess 53 is formed between both ends of the rotating shaft 14 in the radial direction as in the embodiment, not only from the thrust direction but also from the radial direction, that is, from the end face of the rotating shaft 14 in the radial direction. As shown by the white arrows in FIGS. 3 and 4, the oil flows into the recess 53 and heads toward the inlet hole 52.

As described in detail above, in the present invention, the back pressure chamber 39 formed on the back surface of the end plate 31 of the movable scroll 22 and the back pressure passage connecting the discharge space 27 on the discharge side of the compression mechanism 4 and the back pressure chamber 39. In the scroll compressor 1 provided with the 43, the inlet hole 52 for communicating the oil passage 46 formed in the rotating shaft 14 for driving the movable scroll 22 and the back pressure chamber 39 is provided on the movable scroll 22 side of the rotating shaft 14. Since the opening is made in the recess 53 formed on the end face, the oil flowing into the back pressure chamber 39 smoothly passes through the recess 53 into the inlet hole 52 without enlarging the axial dimension of the scroll compressor 1. You will be able to flow in.

In particular, as in the embodiment, an eccentric bush 36 fitted to the boss portion 33 of the movable scroll 22 is attached to the drive protrusion 48 of the rotating shaft 14, and the eccentric bush 36 has a positional relationship corresponding to at least a part of the inlet hole 52. Even in such a case, the oil can flow into the inlet hole 52 through the recess 53 without any trouble.

As a result, when the discharge pressure adjusted by the orifice 44 of the back pressure passage 43 is supplied to the back pressure chamber 39 as in the embodiment, the rotation becomes high and a large amount of oil flows into the back pressure chamber 39. However, since it is possible to prevent the oil from being stuck in the oil passage 46 from the inlet hole 52, the back pressure becomes high and the movable scroll 22 is excessively pressed against the fixed scroll 21, and the power consumption increases. It will be possible to eliminate the inconvenience of doing so.

Further, when oil is supplied from the oil passage 46 to the front bearing 18 via the branch passage 51 as in the embodiment, the oil can be smoothly supplied to the front bearing 18, and the rotary shaft 14 is seized. The inconvenience that occurs is also eliminated.

Further, in the embodiment, since the recess 53 has a groove shape on the end face of the rotating shaft 14 on the movable scroll 22 side, which extends between both ends of the rotating shaft 14 in the radial direction, oil is also formed from the end face of the rotating shaft 14 in the radial direction. Enters the recess 53 and can flow into the inlet hole 52. As a result, the oil in the back pressure chamber 39 can be more smoothly discharged to the oil passage 46 of the rotating shaft 14, and the increase in power consumption due to the excessive back pressure can be more reliably eliminated. become.

In the embodiment, the present invention is applied to the scroll compressor used in the refrigerant circuit of the air conditioner for vehicles, but the present invention is not limited to this, and the present invention is effective for the scroll compressor used in the refrigerant circuit of various refrigerating devices. Is. Further, in the embodiment, the present invention is applied to a so-called inverter-integrated scroll compressor, but the present invention is not limited to this, and the present invention can also be applied to a normal scroll compressor not integrally provided with an inverter.

1 Scroll compressor 4 Compression mechanism 6 Main housing 7 Compression mechanism housing 9 Compression mechanism cover 11 Housing 14 Rotating shaft 18 Front bearing (bearing member)
21 Fixed scroll 22 Movable scroll 23, 31 End plate 24, 32 Wrap 27 Discharge space (discharge side)
34 Compression chamber 36 Eccentric bush 39 Back pressure chamber 43 Back pressure passage 44 Orifice 46 Oil passage 48 Drive protrusion 51 Branch passage 52 Inlet hole 53 Recess

Claims (6)

A compression mechanism consisting of a fixed scroll and a movable scroll in which spiral wraps are formed so as to face each other on each surface of each end plate is provided, and the movable scroll is revolved around the fixed scroll to cause both scrolls. In a scroll compressor that compresses the working fluid in a compression chamber formed between the laps.
A back pressure chamber formed on the back surface of the movable scroll end plate and
A back pressure passage that communicates the discharge side of the compression mechanism with the back pressure chamber,
The rotating shaft that drives the movable scroll and
An oil passage formed in the rotating shaft and
It is provided with an inlet hole that opens at the end face of the rotating shaft on the movable scroll side and communicates the back pressure chamber and the oil passage.
A scroll compressor characterized in that a recess is formed on an end surface of the rotating shaft on the movable scroll side, and the inlet hole opens in the recess. The scroll compressor according to claim 1, further comprising a bearing member that supports the rotating shaft, and oil is supplied to the bearing member from an oil passage of the rotating shaft. The scroll compressor according to claim 1 or 2, wherein the back pressure passage is provided with an orifice. The boss portion formed on the back surface of the movable scroll end plate and
At the end of the rotating shaft on the movable scroll side, an eccentric bush provided eccentrically from the axis is provided.
The scroll compressor according to any one of claims 1 to 3, wherein the eccentric bush is fitted to the boss portion and has a positional relationship corresponding to at least a part of the inlet hole. .. The end face of the rotating shaft on the movable scroll side is provided with a drive projection protruding at a position eccentric from the axis of the rotating shaft.
The scroll compressor according to claim 4, wherein the eccentric bush is movably attached to the drive projection. Any of claims 1 to 5, wherein the recess has a groove shape extending between both ends of the rotating shaft on the movable scroll side in the radial direction. The scroll compressor described in Crab.

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