JP2018066295A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an efficient scroll compressor in a symmetric lap structure capable of reducing thrust slide loss while suppressing refrigerant leakage loss.SOLUTION: The scroll compressor includes a fixed scroll having a spiral fixed side lap, and a movable scroll 40 having a movable side panel 41 and a spiral movable side lap 42, the movable side lap extending from a front face 41a of the movable side panel to form a compression chamber in combination with the fixed side lap. Out of a curved outer periphery side face 41b of the movable side panel, an area downstream of a winding end E of the movable side lap in a spiral direction A of the movable side lap and close to the winding end of the movable side lap is located on the center side of the movable scroll further than an outer periphery end 42a of the winding end of the movable side lap with respect to a center O of the movable scroll.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a scroll compressor, and more particularly to a scroll compressor having a symmetrical wrap structure.

  Conventionally, a scroll compressor having a symmetrical wrap structure is known. In a scroll compressor having a symmetric wrap structure, the end plate of the movable scroll is generally formed in a disc shape as disclosed in, for example, Japanese Patent Application Laid-Open No. 8-151984.

  However, if the end plate of the orbiting scroll is formed into a disk shape, the fixed scroll side and the end plate of the orbiting scroll slide on the part that is not necessary for suppressing the refrigerant leakage loss, and the thrust sliding loss is reduced. Easy to increase. Therefore, the conventional scroll compressor in which the end plate of the movable scroll is formed into a disk shape has room for reduction in thrust sliding loss.

  An object of the present invention is to provide a scroll compressor having a symmetrical wrap structure, which is efficient and capable of reducing thrust sliding loss while suppressing refrigerant leakage loss.

  The scroll compressor according to the first aspect of the present invention is a scroll compressor having a symmetrical wrap structure. The scroll compressor includes a fixed scroll and a movable scroll. The fixed scroll includes a fixed side end plate and a spiral fixed side wrap extending from the front surface of the fixed side end plate. The movable scroll has a movable side end plate and a spiral movable side wrap. The movable side wrap extends from the front surface of the movable side end plate facing the front surface of the fixed side end plate. The movable wrap is combined with the fixed wrap to form a compression chamber. Of the curved outer peripheral side surface of the movable side end plate, the downstream side of the winding end portion of the movable side wrap in the spiral direction of the movable side wrap, and the portion near the winding end portion of the movable side wrap is in relation to the center of the movable scroll. Thus, it is positioned closer to the center of the movable scroll than the outer peripheral end of the winding end portion of the movable wrap.

  In the case of using a disc-shaped movable side end plate so that refrigerant leakage loss can be suppressed, it is downstream of the end of winding of the movable side wrap in the spiral direction of the movable side wrap, In the vicinity, there is a thrust surface that is not necessary for suppressing refrigerant leakage loss.

  On the other hand, in the scroll compressor according to the first aspect of the present invention, in the region where there is a thrust surface that is not necessary for suppressing the refrigerant leakage loss, the outer peripheral side surface of the movable side end plate is connected to the winding end portion of the movable side wrap. It arrange | positions in the center side of a movable scroll rather than an outer peripheral end. Therefore, it is possible to reduce the thrust surface that is not necessary for suppressing the refrigerant leakage loss as compared with the case where the disc-shaped movable side end plate is used. As a result, it is possible to realize an efficient symmetric wrap structure scroll compressor that can suppress the refrigerant leakage loss and reduce the thrust sliding loss.

  Moreover, since the movable side end plate of the scroll compressor can be formed smaller than the disk-like movable side end plate, the weight of the movable side end plate can be reduced.

  A scroll compressor according to a second aspect of the present invention is the scroll compressor according to the first aspect, wherein the outer peripheral side surface of the movable side end plate is at least partially formed into an arc shape centered on the center of the movable scroll. ing.

  In the scroll compressor according to the second aspect of the present invention, since the outer peripheral side surface of the movable side end plate is at least partially formed into an arc shape, the outer peripheral side surface of the movable side end plate is formed when the movable side wrap is formed by cutting or the like. It is easy to grip firmly. When gripping the outer peripheral side surface of the arc-shaped movable side end plate, the movable side wrap can be formed more accurately than when gripping other portions of the movable scroll (such as the boss on the back side of the movable scroll). In addition, the processing of the movable side end plate is relatively easy as compared to the case where the entire outer peripheral side surface of the movable side end plate is formed in an involute shape or the like.

  The scroll compressor which concerns on the 3rd viewpoint of this invention is a scroll compressor of the 1st viewpoint or the 2nd viewpoint, Comprising: A movable side end plate is a movable scroll from an outer peripheral side surface outside the winding end part of a movable side wrap. A first end plate convex portion projecting radially outward with respect to the center.

  In the scroll compressor according to the third aspect of the present invention, the thrust sliding loss is suppressed by the configuration of the scroll compressor according to the first aspect or the second aspect, and the part necessary for suppressing the refrigerant leakage loss is the first. A sufficient thrust surface can be secured by the projections on the end plate to reduce the refrigerant leakage loss.

  A scroll compressor according to a fourth aspect of the present invention is the scroll compressor according to the third aspect, which is upstream of the first end plate projection in the spiral direction of the movable wrap and in the vicinity of the first end plate projection. A predetermined angle region exists in the portion. In this angle region, the distance from the center of the movable scroll to the outer peripheral side surface of the movable side end plate is shorter than the distance from the center of the movable scroll to the outer peripheral end of the movable side wrap, and the inner peripheral end of the movable side wrap from the center of the movable scroll. Longer than the distance.

  In the scroll compressor which concerns on the 4th viewpoint of this invention, it is formed so that the outer peripheral side surface of a movable side end plate may be arrange | positioned in the back surface of a movable side wrap in the location which is not necessary for suppression of refrigerant | coolant leakage loss. Therefore, it is easy to reduce the weight of the movable scroll, and it is easy to realize an efficient scroll compressor.

  The scroll compressor which concerns on the 5th viewpoint of this invention is a scroll compressor of the 3rd viewpoint or the 4th viewpoint, Comprising: The Oldham coupling which prevents rotation of a movable scroll is further provided. A keyway for the Oldham joint is formed on the back surface of the first end plate convex portion.

  In the scroll compressor according to the fifth aspect of the present invention, the first end plate convex portion is also used as a key groove forming portion of the Oldham joint. Therefore, an increase in the thrust surface can be suppressed, and an unnecessary increase in the thrust sliding loss of the movable side end plate can be suppressed.

  The scroll compressor which concerns on the 6th viewpoint of this invention is a scroll compressor in any one of the 1st viewpoint to the 5th viewpoint, Comprising: The chip seal arrange | positioned between the tooth tip of a fixed side wrap, and a movable side end plate Is further provided.

  In the scroll compressor according to the sixth aspect, an efficient symmetrical wrap structure scroll compressor capable of reducing the thrust sliding loss while suppressing the refrigerant leakage loss even when such a chip seal is used is realized. it can.

  A scroll compressor according to a seventh aspect of the present invention is the scroll compressor according to the sixth aspect, wherein the movable side end plate is movable from the outer peripheral side surface outside the portion sliding with the outer peripheral side end portion of the tip seal. It has the 2nd end plate convex part projected on the diameter direction outside to the center of a scroll.

  In the scroll compressor according to the seventh aspect, when the tip seal is used, the thrust sliding surface is sufficiently suppressed by the second end plate convex portion for the portion necessary for suppressing the refrigerant leakage loss while suppressing the thrust sliding loss. It can be ensured and refrigerant leakage loss can be reduced.

  In the scroll compressor according to the present invention, in the region where there is a thrust surface that is not necessary for suppressing the refrigerant leakage loss, the outer peripheral side surface of the movable side end plate is positioned at the center of the movable scroll rather than the outer peripheral end of the winding end portion of the movable side wrap. Arranged on the side. Therefore, it is possible to reduce the thrust surface that is not necessary for suppressing the refrigerant leakage loss as compared with the case where the disc-shaped movable side end plate is used. As a result, it is possible to realize an efficient symmetric wrap structure scroll compressor that can suppress the refrigerant leakage loss and reduce the thrust sliding loss.

It is a schematic longitudinal cross-sectional view of the scroll compressor which concerns on 1st Embodiment of this invention. It is a schematic plan view of the fixed side wrap of the fixed scroll of the scroll compressor of FIG. It is a schematic plan view of the movable scroll of the scroll compressor of FIG. It is a schematic side view of the movable scroll of the scroll compressor of FIG. It is the figure which looked at the state which the fixed scroll and movable scroll of the scroll compressor of FIG. (A) has shown the state which the outer peripheral part of the wrap closed and the suction process was completed. (B) shows a state where the phase is advanced 90 ° from (a), (c) shows a state where the phase is further advanced 90 ° from (b), and (d) shows a state where the phase is advanced 90 ° further from (c). Each state is shown. A hatched portion on the movable side end plate indicates a sealing surface necessary for suppressing refrigerant leakage loss. It is a schematic plan view of the fixed side wrap of the fixed scroll of the scroll compressor which concerns on 2nd Embodiment of this invention. It is a schematic plan view of the movable scroll of the scroll compressor which concerns on 2nd Embodiment of this invention. It is a schematic plan view of the movable scroll of the scroll compressor of the modification C of this invention. An example of the movable scroll when the tip seal is not disposed at the tip of the fixed side wrap of the fixed scroll is (a), and an example of the movable scroll when the tip seal is disposed at the tip of the fixed side wrap of the fixed scroll (b) Respectively. It is a schematic plan view of the movable scroll of the scroll compressor of the modification D of this invention. It is a schematic bottom view of the movable scroll of the scroll compressor of the modification E of this invention. It is a schematic perspective view of the movable scroll of the scroll compressor of the modification E of this invention.

  An embodiment of a scroll compressor according to the present invention will be described with reference to the drawings. The following embodiments are merely examples, and can be appropriately changed without departing from the gist of the present invention.

  In order to describe the direction and arrangement in the embodiment of the scroll compressor, expressions such as “upper” and “lower” may be used, but unless otherwise specified, the direction of the arrow U in FIG. .

  In the following description, expressions such as parallel, orthogonal, horizontal, vertical (vertical), and the same may be used, but these expressions are strictly related to parallel, orthogonal, horizontal, vertical, and identical. It doesn't mean just the case. Expressions such as “parallel”, “orthogonal”, “horizontal”, “vertical”, and “identical” include cases where the relationship is substantially parallel, orthogonal, horizontal, vertical, identical or the like.

<First Embodiment>
(1) Overall Configuration A scroll compressor 100 according to the first embodiment of the present invention will be described.

  The scroll compressor 100 is an apparatus used for a refrigeration apparatus. The scroll compressor 100 is mounted on, for example, an outdoor unit of an air conditioner and constitutes a part of a refrigerant circuit of the air conditioner. The scroll compressor 100 sucks the refrigerant and compresses and discharges the sucked refrigerant. The refrigerant is, for example, R32 of HFC refrigerant. Note that R32 is merely an example of the type of refrigerant, and the refrigerant compressed by the scroll compressor 100 may be other than R32.

  The scroll compressor 100 is a so-called hermetic compressor. The scroll compressor 100 is a compressor with a symmetrical wrap structure.

  As shown in FIG. 1, the scroll compressor 100 mainly includes a casing 10, a compression mechanism 20, a housing 50, a motor 60, a drive shaft 70, and a lower housing 80.

(2) Detailed Configuration The casing 10, the compression mechanism 20, the housing 50, the motor 60, the drive shaft 70, and the lower housing 80 will be described below.

(2-1) Casing The scroll compressor 100 has a vertically long cylindrical casing 10 (see FIG. 1).

  The casing 10 includes a cylindrical cylindrical member 11 that is open at the top and bottom, and an upper lid 12 a and a lower lid 12 b that are respectively provided at the upper end and the lower end of the cylindrical member 11. The cylindrical member 11, and the upper lid 12a and the lower lid 12b are fixed by welding so as to keep airtightness.

  The casing 10 accommodates various members constituting the scroll compressor 100 such as the compression mechanism 20, the housing 50, the motor 60, the drive shaft 70, and the lower housing 80 (see FIG. 1).

  A compression mechanism 20 is disposed on the upper portion of the casing 10. A housing 50 is disposed below the compression mechanism 20 (see FIG. 1). A motor 60 is disposed below the housing 50. A lower housing 80 is disposed below the motor 60 (see FIG. 1). An oil reservoir space 15 is formed at the bottom of the casing 10 (see FIG. 1). Refrigerating machine oil for lubricating the compression mechanism 20 and the like is stored in the oil reservoir space 15.

  Inside the casing 10, a first space S <b> 1 below the fixed scroll 30 of the compression mechanism 20 described later and a second space S <b> 2 above the fixed scroll 30 are formed. The first space S1 is a space in which the motor 60 is disposed. The first space S1 is a space into which refrigerant before being compressed by the scroll compressor 100 flows from the refrigerant circuit of the air conditioner of which the scroll compressor 100 constitutes a part. In other words, the first space S1 is a space into which low-pressure refrigerant flows in the refrigeration cycle. The second space S2 is a space into which refrigerant discharged from the compression mechanism 20 (refrigerant compressed by the compression mechanism 20) flows. In other words, the second space S2 is a space into which high-pressure refrigerant flows in the refrigeration cycle. The scroll compressor 100 is a so-called low-pressure dome type scroll compressor.

  A suction pipe 13 and a discharge pipe 14 are attached to the casing 10 so as to communicate the inside and the outside of the casing 10 (see FIG. 1).

  The suction pipe 13 is attached to an intermediate part in the vertical direction of the casing 10 (see FIG. 1). The suction pipe 13 is attached to the casing 10 at a height position between the housing 50 and the motor 60. The suction pipe 13 communicates the outside of the casing 10 and the first space S <b> 1 inside the casing 10. The refrigerant before compression (low-pressure refrigerant in the refrigeration cycle) flows into the first space S1 of the scroll compressor 100 through the suction pipe 13.

  The discharge pipe 14 is attached to the upper part of the casing 10 and above the fixed scroll 30 of the compression mechanism 20 described later (see FIG. 1). The discharge pipe 14 communicates the outside of the casing 10 and the second space S2 inside the casing 10. The refrigerant compressed by the compression mechanism 20 and flowing into the second space S <b> 2 (high-pressure refrigerant in the refrigeration cycle) flows out of the scroll compressor 100 through the discharge pipe 14.

(2-2) Compression mechanism The compression mechanism 20 mainly has the fixed scroll 30, the movable scroll 40, and the Oldham coupling 46 (refer FIG. 1). The movable scroll 40 and the fixed scroll 30 are combined to form a compression chamber Sc (see FIG. 1).

  The compression mechanism 20 compresses the refrigerant in the compression chamber Sc and discharges the compressed refrigerant.

  The compression mechanism 20 has a symmetrical wrap structure. In the compression mechanism 20 having a symmetrical wrap structure, a compression chamber (see FIG. 2) surrounded by an outer peripheral surface of a movable side wrap 42 of a movable scroll 40 described later and an inner peripheral surface of a fixed side wrap 32 of a fixed scroll 30 described later. A compression chamber (B chamber) formed by being surrounded by the A chamber), the inner peripheral surface of the movable wrap 42, and the outer peripheral surface of the fixed wrap 32 is formed point-symmetrically (see FIG. 5). . Then, in the compression mechanism 20 having the symmetrical wrap structure, the compression of the A chamber and the B chamber is started at the same timing. Further, in the compression mechanism 20 having the symmetrical wrap structure, the winding end angle of the movable side wrap 42 and the winding end angle of the fixed side wrap 32 are the same.

  The Oldham coupling 46 is disposed below the movable scroll 40 and above the housing 50. The Oldham coupling 46 includes an annular ring portion, a key-like protrusion (not shown) protruding upward, and a key-like protrusion (not shown) protruding downward. The key-shaped protrusion of the Oldham joint 46 protruding upward is slidably engaged with the movable scroll 40, and the key-shaped protrusion of the Oldham joint 46 protruding downward is slidably engaged with the housing 50. The Oldham coupling 46 restricts the rotation of the movable scroll 40 and causes the movable scroll 40 to revolve with respect to the fixed scroll 30.

  Hereinafter, the fixed scroll 30 and the movable scroll 40 will be mainly described in detail.

(2-2-1) Fixed Scroll The fixed scroll 30 is placed on the housing 50 (see FIG. 1). The fixed scroll 30 and the housing 50 are fixed by fixing means (for example, bolts) not shown.

  The fixed scroll 30 has a disk-shaped fixed side end plate 31 and a fixed side wrap 32 (see FIG. 1).

  The fixed side wrap 32 extends from the front surface (lower surface) 31a of the fixed side end plate 31 to the movable scroll 40 side (see FIG. 1). The fixed-side wrap 32 is formed in a spiral shape from the winding start portion 32s near the center of the fixed scroll to the winding end portion 32e on the outer peripheral side in plan view (see FIG. 2). The spiral shape of the fixed side wrap 32 is formed by, for example, an involute curve. The fixed side wrap 32 is combined with a movable side wrap 42 of the movable scroll 40 described later to form a compression chamber Sc. Specifically, the fixed scroll 30 and the movable scroll 40 are combined in a state where a front surface 31a of the fixed-side end plate 31 and a front surface 41a of a movable-side end plate 41, which will be described later, face each other, and the fixed-side end plate 31 and the fixed-side wrap 32, a movable side wrap 42, and a movable side end plate 41 of a movable scroll 40 to be described later are formed (see FIG. 1). As will be described later, when the movable scroll 40 turns with respect to the fixed scroll 30, the refrigerant (low-pressure refrigerant in the refrigeration cycle) that flows from the first space S1 into the peripheral compression chamber Sc enters the central compression chamber Sc. As it moves, it is compressed and the pressure rises.

  A discharge port 31b that discharges the refrigerant compressed by the compression mechanism 20 is formed substantially through the fixed side end plate 31 in the thickness direction (vertical direction) (see FIG. 1). ). The discharge port 31 b communicates with the compression chamber Sc on the center side (innermost side) of the compression mechanism 20. A discharge valve (not shown) for opening and closing the discharge port 31b is attached above the fixed-side end plate 31. When the pressure in the innermost compression chamber Sc with which the discharge port 31b communicates becomes larger than the pressure in the second space S2 above the fixed scroll 30 by a predetermined value or more, the discharge valve opens and the second from the discharge port 31b. The refrigerant flows into the space S2.

(2-2-2) Movable Scroll The movable scroll 40 is disposed below the fixed scroll 30.

  As shown in FIG. 1, the movable scroll 40 includes a movable side end plate 41, a movable side wrap 42 extending upward from a front surface (upper surface) 41 a of the movable side end plate 41, and a rear surface (lower surface) 41 e of the movable side end plate 41. And a boss portion 43 extending downward. A tip seal may be provided between the tooth tip of the movable side wrap 42 and the fixed side end plate 31.

  The movable side wrap 42 extends from the front surface (upper surface) 41a of the movable side end plate 41 facing the front surface (lower surface) 31a of the fixed side end plate 31 to the fixed scroll 30 side (see FIG. 1). The movable side wrap 42 is formed in a spiral shape from the winding start portion S near the center O of the movable scroll 40 to the winding end portion E on the outer peripheral side of the movable scroll 40 in plan view (see FIG. 3). The spiral shape of the movable side wrap 42 is formed by, for example, an involute curve.

  Here, the center O of the movable scroll 40 is the center of the foundation circle of the involute curve constituting the movable side wrap 42. Further, the center O of the movable scroll 40 is a point through which a central axis C1 of an eccentric portion 71 of a drive shaft 70 to be described later inserted into the boss portion 43 passes. Further, the direction in which the movable wrap 42 is wound is referred to herein as a spiral direction. In the scroll compressor 100 of this embodiment, as shown in FIG. 3, the spiral direction A is clockwise when viewed from above.

  The shape of the movable side end plate 41 will be described with reference to FIGS.

  First, as drawn in a two-dot chain line in FIG. 3, a virtual circle K is assumed in plan view that passes through the outer peripheral end 42 a of the winding end E of the movable side wrap 42 with the center O of the movable scroll 40 as the center. To do. If a movable circular end plate having a virtual circle K as an outer edge is used for the movable scroll, there is a gap through which the refrigerant leaks from the compression chamber Sc during compression at any timing when the movable scroll rotates. It is not formed between the tooth tip of the fixed side wrap 32 and the movable side end plate. Here, the movable side wrap 42 is located downstream of the winding end E of the movable side wrap 42 in the spiral direction A, and is in sliding contact with the tooth tip of the fixed side wrap 32 at any timing when the movable scroll rotates. The front surface of the side end plate is referred to as a sealing surface 41c (see the hatched portion in FIG. 3). The sealing surface 41c has an angular range of about 180 ° in the spiral direction A of the movable side wrap 42 around the center O of the movable scroll 40, starting from the outer peripheral end 42a of the winding end E of the movable side wrap 42 in plan view. Be placed.

  In addition, even without using a circular-shaped movable side end plate having an imaginary circle K as an outer edge, the front surface of the movable side end plate 41 exists between adjacent movable side wraps 42 in plan view, and a seal surface 41c exists. If it does so, the leakage of the refrigerant | coolant from the compression chamber Sc can be prevented.

  Now, in the movable scroll 40 of the present embodiment, of the curved outer peripheral side surface 41b of the movable side end plate 41, the vicinity 41ba is the outer periphery of the winding end portion E of the movable side wrap 42 with respect to the center O of the movable scroll 40. It is located closer to the center O of the movable scroll 40 than the end 42a (see FIG. 3). The vicinity 41ba of the outer peripheral side surface 41b is a downstream side of the winding end E of the movable side wrap 42 in the spiral direction A of the movable side wrap 42 and a portion near the winding end E of the movable side wrap 42. Say. That is, in a plan view, the vicinity 41ba of the outer peripheral side surface 41b of the movable side end plate 41 is formed so as to enter the center O side of the movable scroll 40 with respect to the outer peripheral end 42a of the movable side wrap 42 (FIG. 3). reference). In a plan view, the vicinity portion 41ba is also formed in an arc shape centered on the center O of the movable scroll 40, and the radius R2 of the arc of the vicinity portion 41ba is the outer peripheral end of the winding end portion E of the movable side wrap 42 described above. It is smaller than the radius R1 of the virtual circle K passing through 42a. The curved outer peripheral side surface 41b of the movable side end plate 41 is formed in an arc shape having a radius R2 centered on the center O of the movable scroll 40 in the angle region B1 drawn in FIG. The angle region B1 is a second end plate convex portion described later from the vicinity of the first end plate convex portion 44 described later on the downstream side of the winding end portion E of the movable side wrap 42 in the spiral direction A of the movable side wrap 42 in plan view. It is an angle region up to the vicinity of 45.

  The front surface 41 a of the movable side end plate 41 of the movable scroll 40 includes all of the above-described seal surface 41 c. Therefore, a gap is formed between the lower end of the fixed side wrap 32 and the movable side end plate 41, and the refrigerant is prevented from leaking from the compression chamber Sc during compression (see FIG. 5).

  If a movable circular end plate having a virtual circle K as an outer edge as described above is used, it is downstream from the winding end E of the movable side wrap 42 in the spiral direction A of the movable side wrap 42. The region between the virtual circle K and the outer edge of the seal surface 41c (see FIG. 3) is a thrust surface that does not contribute to the seal. In the movable scroll 40 of the present embodiment, the movable side end plate 41 is configured as described above, so that it is possible to reduce a thrust surface that is not related to such a seal.

  The movable end plate 41 has a first end plate convex portion 44 that protrudes radially outward with respect to the center O of the movable scroll 40 from the curved outer peripheral side surface 41b outside the winding end portion E of the movable side wrap 42 ( (See FIG. 3). The movable side end plate 41 has a second end plate convex portion 45 on the opposite side of the first end plate convex portion 44 across the center O of the movable scroll 40 (see FIG. 3). On the back surface 44b of the first end plate convex portion 44, a key groove 44a for the Oldham joint 46 is formed, on which a key-shaped projection (not shown) of the Oldham joint 46 that prevents the movable scroll 40 from rotating and revolves slides. (See FIG. 4). Also, a key groove 45a for the Oldham joint 46 is formed on the back surface 45b of the second end plate projection 45, on which a key-shaped protrusion (not shown) of the Oldham joint 46 slides (see FIG. 4).

  By providing the first end plate convex portion 44 and the second end plate convex portion 45, it is possible to sufficiently secure a thrust surface necessary for sealing between the tooth tip of the fixed side wrap 32 and the movable side end plate 41. In addition, here, the first end plate convex portion 44 and the second end plate convex portion 45 are also used as forming portions of the key grooves 44 a and 45 a for the Oldham joint 46. Therefore, in the scroll compressor 100 of the present embodiment, an unnecessary increase in the thrust surface is suppressed and the thrust slide of the movable side end plate 41 is suppressed as compared with the case where the key grooves 44a and 45a for the Oldham joint 46 are separately provided. Unnecessary increase in dynamic loss can also be suppressed.

  Moreover, in the movable scroll 40 of this embodiment, it extends from the vicinity of the first end plate convex portion 44 to the vicinity of the second end plate convex portion 45 of the movable side wrap 42 in a direction opposite to the spiral direction A of the movable side wrap 42 in plan view. In the region, the curved outer peripheral side surface 41 b of the movable side end plate 41 is positioned closer to the center O side of the movable scroll 40 than the outer peripheral end 42 a of the winding end portion E of the movable side wrap 42 with respect to the center O of the movable scroll 40. (See FIG. 3). In a plan view, the curved outer peripheral side surface 41b of the movable side end plate 41 is formed in an arc shape having a radius R2 centering on the center O of the movable scroll 40 in the angle region B2 in FIG. The angle region B2 is an angle region extending from the vicinity of the first end plate convex portion 44 to the vicinity of the second end plate convex portion 45 in a direction opposite to the spiral direction A of the movable side wrap 42 in plan view. That is, in the movable scroll 40 of the present embodiment, a perfect circle having the virtual circle K as the outer edge in a region extending from the vicinity of the first end plate convex portion 44 to the vicinity of the second end plate convex portion 45 in the direction opposite to the spiral direction A. The thrust surface that does not contribute to the seal is reduced as compared with the case where the movable end plate having the shape is used. Therefore, in the movable scroll 40 of the present embodiment, the thrust sliding loss is further easily suppressed. In plan view, the front surface 41a of the movable side end plate 41 outside the inner peripheral end of the outermost peripheral movable wrap 42 in the angle region B3 in FIG. 3 is a thrust surface that does not contribute to the seal. The angle region B3 extends from the end of the seal surface 41c on the second end plate convex portion 45 side to the end of the seal surface 41c on the first end plate convex portion 44 side in the spiral direction A of the movable side wrap 42 in plan view. It is an angle region.

  As described above, the outer peripheral side surface 41b of the movable side end plate 41 is formed in an arc shape having a radius R2 centered on the center O of the movable scroll 40 in the angle region B1 and the angle region B2. With this configuration, when the movable side wrap 42 of the movable scroll 40 is formed by cutting (end milling) or the like, the outer peripheral side surface 41b of the movable side end plate 41 (for example, the point G1, FIG. It is easy to firmly hold the three points G2 and G3) with the chuck of the machine tool. Therefore, for example, the movable side wrap 42 can be processed with higher accuracy than when the movable side wrap 42 is processed while gripping the outer surface of the boss portion 43 of the movable scroll 40 having a small diameter.

  The boss portion 43 is a cylindrical portion whose upper end is closed by the movable side end plate 41. The boss portion 43 is disposed in a space surrounded by a recess 51 of the housing 50 described later. A bearing metal 43 a is disposed in the hollow portion of the boss portion 43. An eccentric portion 71 of a drive shaft 70 to be described later is inserted into the bearing metal 43a. The movable scroll 40 and the drive shaft 70 are connected by inserting the eccentric portion 71 into the bearing metal 43a.

(2-3) Housing The housing 50 is press-fitted into the cylindrical member 11 of the casing 10 and fixed. A fixed scroll 30 is placed on the upper portion of the housing 50, and the housing 50 and the fixed scroll 30 are fixed by a bolt or the like (not shown). A movable scroll 40 is disposed above the housing 50. The housing 50 supports the movable scroll 40 from below. Further, an Oldham coupling 46 is disposed above the housing 50.

  The housing 50 is formed with a key groove (not shown) in which a key-shaped projection (not shown) of the Oldham coupling 46 is slidably engaged. The housing 50 has a recess 51 formed in the upper center so as to be recessed downward. The housing 50 has an upper bearing 52 disposed below the recess 51.

  The recess 51 surrounds the side surface of the space in which the boss portion 43 of the movable scroll 40 is disposed.

  The upper bearing 52 is provided with a bearing metal 52a. The bearing metal 52 a rotatably supports the main shaft 72 of the drive shaft 70 inserted through the upper bearing 52.

(2-4) Motor The motor 60 drives the movable scroll 40. The motor 60 includes an annular stator 61 and a rotor 62 (see FIG. 1).

  The stator 61 is fixed to the inner surface of the cylindrical member 11 of the casing 10. A coil (not shown) is wound around the stator 61.

  The rotor 62 is a cylindrical member. The rotor 62 is rotatably accommodated inside the annular stator 61 with a slight gap (air gap). A drive shaft 70 is inserted through the hollow portion of the rotor 62. The rotor 62 is connected to the movable scroll 40 via the drive shaft 70. When the motor 60 is operated, the rotor 62 rotates, and the movable scroll 40 connected to the rotor 62 via the drive shaft 70 is turned.

(2-5) Drive shaft The drive shaft 70 extends in the casing 10 in the vertical direction.

  The drive shaft 70 connects the rotor 62 of the motor 60 and the movable scroll 40 of the compression mechanism 20. The drive shaft 70 transmits the driving force of the motor 60 to the movable scroll 40.

  The drive shaft 70 mainly has a columnar eccentric portion 71 and a columnar main shaft 72 (see FIG. 1).

  The eccentric portion 71 is disposed at the upper end of the main shaft 72. The central axis C1 of the eccentric portion 71 is eccentric with respect to the central axis C2 of the main shaft 72 (see FIG. 1). The eccentric portion 71 is inserted into the bearing metal 43 a disposed inside the boss portion 43 of the movable scroll 40. With the eccentric portion 71 inserted into the boss portion 43 and the movable scroll 40 and the drive shaft 70 connected, the central axis C1 of the eccentric portion 71 passes through the center O of the movable scroll 40 as described above.

  The main shaft 72 is rotatably supported by a bearing metal 52a disposed on the upper bearing 52 of the housing 50 and a bearing metal 81a disposed on a lower bearing 81 of the lower housing 80 described later. The main shaft 72 is inserted and connected to the rotor 62 of the motor 60 between the upper bearing 52 and the lower bearing 81.

  An oil passage (not shown) is formed inside the drive shaft 70. The oil passage has a main path (not shown) and a branch path (not shown). The main path extends from the lower end to the upper end of the drive shaft 70 in the axial direction of the drive shaft 70. The branch path extends in the radial direction of the drive shaft 70 from the main path. The refrigerating machine oil stored in the oil reservoir space 15 is pumped up by a pump (not shown) provided at the lower end of the drive shaft 70 and supplied to various sliding portions in the scroll compressor 100 through the oil path. Is done.

(2-6) Lower Housing The lower housing 80 (see FIG. 1) is fixed to the inner surface of the cylindrical member 11 of the casing 10. The lower housing 80 (see FIG. 1) is disposed below the motor 60.

  The lower housing 80 has a lower bearing 81. The lower bearing 81 has a hollow portion. A bearing metal 81 a is disposed in the hollow portion of the lower bearing 81. The main shaft 72 of the drive shaft 70 is inserted through the bearing metal 81a. The bearing metal 81 a rotatably supports the lower side of the main shaft 72 of the drive shaft 70.

(3) Operation of Scroll Compressor The operation of the scroll compressor 100 will be described.

  When the motor 60 is driven, the rotor 62 rotates, and the drive shaft 70 connected to the rotor 62 also rotates. When the drive shaft 70 rotates, the movable scroll 40 does not rotate by the action of the Oldham coupling 46 but revolves with respect to the fixed scroll 30. Then, the low-pressure refrigerant in the refrigeration cycle flowing into the first space S1 from the suction pipe 13 passes through a refrigerant passage (not shown) formed in the housing 50 and enters the compression chamber Sc on the peripheral side of the compression mechanism 20. Inhaled. As the movable scroll 40 revolves, the first space S1 and the compression chamber Sc are not in communication. As the movable scroll 40 revolves and the volume of the compression chamber Sc decreases, the pressure in the compression chamber Sc increases. The pressure of the refrigerant rises as it moves from the peripheral side (outside) compression chamber Sc to the central side (inside) compression chamber Sc, and finally becomes a high pressure in the refrigeration cycle. The refrigerant compressed by the compression mechanism 20 is discharged into the second space S2 from the discharge port 31b located near the center of the fixed side end plate 31. The high-pressure refrigerant in the refrigeration cycle of the second space S2 is discharged from the discharge pipe 14.

(4) Features (4-1)
The scroll compressor 100 according to the present embodiment is a scroll compressor having a symmetrical wrap structure. The scroll compressor 100 includes a fixed scroll 30 and a movable scroll 40. The fixed scroll 30 includes a fixed side end plate 31 and a spiral fixed side wrap 32 extending from the front surface 31 a of the fixed side end plate 31. The movable scroll 40 includes a movable side end plate 41 and a spiral movable side wrap 42. The movable side wrap 42 extends from the front surface 41 a of the movable side end plate 41 facing the front surface 31 a of the fixed side end plate 31. The movable side wrap 42 is combined with the fixed side wrap 32 to form the compression chamber Sc. Of the curved outer peripheral side surface 41 b of the movable side end plate 41, a portion downstream of the winding end portion E of the movable side wrap 42 in the spiral direction A of the movable side wrap 42 and in the vicinity of the winding end portion E of the movable side wrap 42. However, the center O of the movable scroll 40 is located closer to the center O side of the movable scroll 40 than the outer peripheral end 42 a of the winding end E of the movable side wrap 42.

  When the disc-shaped movable side end plate 41 is used to suppress refrigerant leakage loss, the movable side wrap 42 is downstream of the winding end portion E of the movable side wrap 42 in the spiral direction A, and the movable side wrap 42 is movable. In the vicinity of the winding end E of 42, there is a thrust surface that is not necessary for suppressing refrigerant leakage loss.

  For example, if the movable side end plate has a minimum disc shape that can suppress refrigerant leakage loss in plan view, in other words, the shape of the outer peripheral side surface of the movable side end plate is a perfect circle, and the radius of the movable side end plate is Is the minimum diameter capable of suppressing the refrigerant leakage loss, the outline of the movable side end plate is represented as a virtual circle K drawn by a two-dot chain line in FIG. In FIG. 3, a region outside the hatched region and inside the virtual circle K with respect to the center O of the movable scroll 40 is a thrust surface that is not necessary for suppressing the refrigerant leakage loss.

  On the other hand, in the scroll compressor 100 according to the present embodiment, the outer peripheral side surface 41b of the movable side end plate 41 is connected to the winding end portion of the movable side wrap 42 in a region where there is a thrust surface that is not necessary for suppressing refrigerant leakage loss. It arrange | positions rather than the outer peripheral end of E at the center O side of the movable scroll 40 (refer vicinity 41ba of the outer peripheral side surface 41b in FIG. 3). Therefore, it is possible to reduce a thrust surface that is not necessary for suppressing refrigerant leakage loss as compared with the case where the disc-shaped movable side end plate 41 is used. As a result, it is possible to realize an efficient symmetric wrap structure scroll compressor that can suppress the refrigerant leakage loss and reduce the thrust sliding loss.

  Further, since the movable side end plate 41 of the scroll compressor 100 of the present embodiment can be formed smaller than the disc-like movable side end plate, the weight of the movable side end plate 41 can be reduced.

(4-2)
In the scroll compressor 100 of this embodiment, the outer peripheral side surface 41 b of the movable side end plate 41 is partially formed in an arc shape centered on the center O of the movable scroll 40.

  With this configuration, it is easy to firmly hold the outer peripheral side surface 41b of the movable side end plate 41 when the movable side wrap 42 is formed by cutting or the like. When gripping the outer peripheral side surface 41b of the arc-shaped movable side end plate 41, when gripping the other part of the movable scroll 40 (for example, the outer surface of the boss portion 43 having a smaller diameter than the outer peripheral side surface 41b on the back side of the movable scroll 40). Compared to the above, the movable side wrap 42 can be formed with high accuracy. In addition, as compared with the case where the entire outer peripheral side surface 41b of the movable side end plate 41 is formed in an involute shape or the like, the processing of the movable side end plate 41 is relatively easy.

(4-3)
In the scroll compressor 100 of the present embodiment, the movable side end plate 41 protrudes radially outward from the outer peripheral side surface 41 b to the center O of the movable scroll 40 on the outer side of the winding end E of the movable side wrap 42. One end plate convex portion 44 is provided.

  By having the first end plate convex portion 44, a sufficient thrust surface can be secured for the portion necessary for suppressing the refrigerant leakage loss, and the refrigerant leakage loss can be reduced.

(4-4)
The scroll compressor 100 of this embodiment includes an Oldham coupling 46 that prevents the movable scroll 40 from rotating. A key groove 44 a for the Oldham joint 46 is formed on the back surface 44 b of the first end plate projection 44.

  In the scroll compressor 100, the first end plate projection 44 is also used as a part for forming the key groove 44 a of the Oldham joint 46. Therefore, an increase in the thrust surface can be suppressed, and an unnecessary increase in the thrust sliding loss of the movable side end plate 41 can be suppressed.

Second Embodiment
A scroll compressor according to a second embodiment of the present invention will be described.

  Since the scroll compressor according to the second embodiment of the present invention has a lot in common with the scroll compressor 100 according to the first embodiment, the difference from the scroll compressor 100 according to the first embodiment mainly. In principle, explanations of common points are omitted. In the following description, members having the same configuration as in the first embodiment are denoted by the same reference numerals as in the first embodiment.

  The scroll compressor according to the second embodiment is different in that a tip seal 133 is disposed between the tooth tip of the fixed side wrap 132 of the fixed scroll 30 and the movable side end plate 141 of the movable scroll 140 (FIG. 6). reference). For example, a groove (not shown) is formed in the tooth tip of the fixed side wrap 132 of the fixed scroll 30, and the tip seal 133 is disposed in the groove. Although not limited thereto, the shape and size of the fixed-side wrap 132 are the same as those of the fixed-side wrap 32 of the first embodiment, except that a groove is formed in the tooth tip of the fixed-side wrap 132. Same shape and size.

  With the provision of the tip seal 133, in the scroll compressor of the second embodiment, the shape of the movable side end plate 141 of the movable scroll 140 is different from the shape of the movable side end plate 41 of the movable scroll 40 of the first embodiment. The point that the movable side end plate 141 has the first end plate convex portion 44 and the second end plate convex portion 45 is the same as that of the movable end end plate 41 of the first embodiment.

  Here, the shape of the movable side end plate 141 of the movable scroll 140 will be mainly described with reference to FIG.

  First, the fixed scroll 30 in which the chip seal 133 is arranged in a groove (not shown) and the movable scroll (virtual movable scroll) having the movable side wrap 42 and the movable side end plate that extends infinitely are combined to fix the virtual movable scroll. It is assumed that the scroll 30 is turned. Here, the contact between the movable end plate that extends infinitely and the components of the scroll compressor is ignored here. At this time, a part of the front surface of the movable side end plate on the downstream side of the winding end E of the movable side wrap 42 in the spiral direction A of the movable side wrap 42 is a seal surface 141c necessary for sealing the compression chamber Sc. Become. The seal surface 141c slides with the tooth tip of the fixed side wrap 132 or the tip seal 133 on the front surface of the movable side end plate downstream of the winding end E of the movable side wrap 42 in the spiral direction A of the movable side wrap 42. It is a surface to do. The seal surface 141c has an angular range of about 180 ° in the spiral direction A of the movable side wrap 42 around the center O of the movable scroll 140, starting from the outer peripheral end 42a of the winding end portion E of the movable side wrap 42 in plan view. Be placed. The seal surface 141c is larger than the seal surface 41c in the first embodiment because the tip seal sliding surface 141d that slides with the tip seal 133 (the hatched surface that extends obliquely upward to the right) increases.

  Next, the center of the movable scroll in the tip seal sliding surface 141d (see FIG. 7) of the movable side end plate that slides with the outer peripheral side end portion 133a (see FIG. 6) of the tip seal 133 during the turning of the virtual movable scroll. A virtual circle K ′ passing through the seal point 141da farthest from O is assumed (see FIG. 7). The radius R3 of the virtual circle K ′ is larger than the radius R1 of the virtual circle K (the virtual circle K is the same as that described in the first embodiment) passing through the outer peripheral end 42a of the winding end E of the movable side wrap 42. . Assuming that a circular-shaped movable side end plate having an imaginary circle K ′ as an outer edge is used for the movable scroll, a gap through which the refrigerant leaks from the compression chamber Sc during compression at any timing when the movable scroll rotates. However, it is not formed between the lower end of the tip seal 133 and the movable side end plate.

  On the other hand, in the movable scroll 140 of the present embodiment, the neighboring portion 141ba of the curved outer peripheral side surface 141b of the movable side end plate 141 has the winding end portion E of the movable side wrap 42 with respect to the center O of the movable scroll 140. It is located on the center O side of the movable scroll 140 from the outer peripheral end 42a (see FIG. 7). The vicinity portion 141ba of the outer peripheral side surface 141b refers to a portion in the vicinity of the winding end portion E of the movable side wrap 42 that is downstream of the winding end portion E of the movable side wrap 42 in the spiral direction A of the movable side wrap 42. That is, in a plan view, the vicinity 141ba of the outer peripheral side surface 141b of the movable side end plate 141 is formed so as to enter the center O side of the movable scroll 140 with respect to the outer peripheral end 42a of the movable side wrap 42 (FIG. 7). reference). In plan view, a part of the outer peripheral side surface 141b including the vicinity portion 141ba is formed in an arc shape centering on the center O of the movable scroll 140, and the radius R2 ′ of the arc of the vicinity portion 141ba is the radius of the virtual circle K. Less than R1. Of course, the radius R2 'of the arc of the neighboring portion 141ba is smaller than the radius R3 of the virtual circle K' that is larger than the radius R1 of the virtual circle K.

  Further, in the movable scroll 140 of the present embodiment, of the curved outer peripheral side surface 141b of the movable side end plate 141, the vicinity portion 141bb is relative to the center O of the movable scroll 140 than the seal point 141da described above. (See FIG. 7). The vicinity portion 141bb of the outer peripheral side surface 141b is a downstream side of the second end plate convex portion 45 in the spiral direction A of the movable side wrap 42 and the vicinity portion of the second end plate convex portion 45. In plan view, the curved outer periphery of the movable side end plate 141 in the angular region extending from the vicinity of the first end plate convex part 44 to the vicinity of the second end plate convex part 45 in the direction opposite to the spiral direction A of the movable side wrap 42. At least a part of the side surface 141b is formed in an arc shape having a radius R2 ′ centered on the center O of the movable scroll 140. In plan view, the front surface 41a of the movable side end plate 141 outside the inner peripheral end of the outermost peripheral movable wrap 42 in the angle region B3 in FIG. 7 is a thrust surface that does not contribute to the seal. The angle region B3 extends in a spiral direction A of the movable side wrap 42 from the end of the seal surface 141c on the second end plate convex portion 45 side to the end of the seal surface 141c on the first end plate convex portion 44 side in plan view. It is an angle region.

  As described above, in the plan view, the curved outer peripheral side surface 141b of the movable side end plate 141 is, in other words, the portion excluding the first end plate convex portion 44 and the second end plate convex portion 45 of the movable side end plate 141 is the virtual circle K ′. It is arranged more inside. If the movable side end plate has a minimum disc shape that can suppress the refrigerant leakage loss in plan view, in other words, the shape of the outer peripheral side surface of the movable side end plate is a perfect circle, and the radius of the movable side end plate is the refrigerant. When the minimum diameter capable of suppressing leakage loss is used, the outline of the movable side end plate is represented as a virtual circle K ′ drawn by a two-dot chain line in FIG. However, in FIG. 7, a region outside the hatched region and inside the virtual circle K ′ with respect to the center O of the movable scroll 40 is a thrust surface that does not contribute to the seal. In the movable scroll 140 of the present embodiment, the movable side end plate 141 is configured as described above, so that a thrust surface that is not related to such a seal has a circular shape with an imaginary circle K ′ as an outer edge. This can be reduced compared to the case of using a side end plate.

  The second end plate convex portion 45 protrudes radially outward from the outer peripheral side surface 141 b to the center O of the movable scroll 140 on the outer side of the portion that slides with the outer peripheral side end portion 133 a of the tip seal 133. With this configuration, when the tip seal 133 is used, the thrust sliding surface is sufficiently suppressed by the second end plate convex portion 45 for the portion necessary for suppressing the refrigerant leakage loss while suppressing the thrust sliding loss. It is possible to reduce the refrigerant leakage loss.

  The scroll compressor according to the second embodiment has the same features as (4-1) to (4-4) of the scroll compressor according to the first embodiment, and the following features (A) and (B). Have

(A)
The scroll compressor 100 according to the second embodiment includes a tip seal 133 disposed between the tooth tip of the fixed side wrap 32 and the movable side end plate 141.

  Even when such a chip seal 133 is used, it is possible to realize a scroll compressor having an efficient symmetrical wrap structure capable of reducing the thrust sliding loss while suppressing the refrigerant leakage loss.

(B)
In the scroll compressor 100 according to the second embodiment, the movable side end plate 141 is located outside the portion sliding with the outer peripheral side end portion 133a of the tip seal 133 from the outer peripheral side surface 141b to the center O of the movable scroll 140. It has the 2nd end plate convex part 45 which protrudes on the diameter direction outside.

  In the scroll compressor 100 according to the second embodiment, when the tip seal 133 is used, the thrust sliding loss is suppressed, and the portion necessary for suppressing the refrigerant leakage loss is thrust by the second end plate convex portion 45. A sufficient surface can be secured to reduce refrigerant leakage loss.

<Modification>
The modification of the said embodiment is shown below. In addition, the following modifications may be combined as appropriate as long as they do not contradict each other.

(1) Modification A
The scroll compressor of the above embodiment is a vertical scroll compressor in which the drive shaft 70 extends in the vertical direction, but is not limited thereto. The scroll according to the present invention may be a horizontal scroll compressor whose drive shaft extends in the horizontal direction.

(2) Modification B
The scroll compressor of the above-described embodiment is a scroll compressor having a so-called low-pressure dome structure in which the motor 60 is disposed in a space where a low-pressure refrigerant flows in the refrigeration cycle, but is not limited thereto. The scroll compressor according to the present invention may be a scroll compressor having a so-called high-pressure dome structure in which the motor 60 is disposed in a space into which a high-pressure refrigerant flows in the refrigeration cycle after being compressed by the compression mechanism 20.

(3) Modification C
In the scroll compressor of the above embodiment, the front surface 41a of the movable side end plates 41 and 141 is also present on the outer peripheral side of the seal surfaces 41c and 141c. Further, in the scroll compressor of the above embodiment, the front surface 41a of the movable side end plates 41 and 141 is located in the angular region B3 (see FIGS. 3 and 7) and also on the outer peripheral side from the outer peripheral end of the outermost peripheral movable side wrap 42. Exists. However, the scroll compressor according to the present invention is not limited to such a configuration.

  For example, the movable scroll 240 does not have the front surface 41a of the movable side end plate 241 other than the seal surface 41c on the outer peripheral side from the outer peripheral end of the outermost peripheral movable side wrap 42 instead of the movable end end plate 41, FIG. It may have a movable side end plate 241 as in a). Further, for example, the movable scroll 340 does not have the front surface 41a of the movable side end plate 341 other than the seal surface 141c on the outer peripheral side from the outer peripheral end of the outermost peripheral movable side wrap 42 instead of the movable end end plate 141. It may have a movable side end plate 341 as shown in FIG. In this case, the thrust loss of the compression mechanism 20 can be minimized and the movable scrolls 240 and 340 can be reduced in weight.

  However, when formed in such a shape, the outer peripheral side surfaces 241b and 341b of the movable scrolls 240 and 340 are formed by a curve (in this case, a spline curve) that forms the spiral shape of the movable side wrap 42. , 340 tends to be complicated.

(4) Modification D
The shapes of the first end plate convex portion 44 and the second end plate convex portion 45 of the movable side end plates 41, 141 of the scroll compressor of the above embodiment are merely examples and are not limited thereto.

  For example, the movable side end plate 441 having the outer peripheral side surface 441b of the movable scroll 440 may have a first end plate convex portion 444 and a second end plate convex portion 445 having a shape as shown in FIG. A key groove 444a for the Oldham joint 46 is formed on the back surface of the first end plate convex portion 444, and a key groove 445a for the Oldham joint 46 is formed on the back surface of the second end plate convex portion 445 (see FIG. 9). . The movable side end plate 441 has substantially the same shape as the movable side end plate 41 except for the first end plate convex portion 444 and the second end plate convex portion 445.

  In addition, a keyway for the Oldham joint 46 may be formed in a portion other than the first end plate convex portion 444 and the second end plate convex portion 445 of the movable side end plate. However, from the viewpoint of suppressing the thrust loss, the movable side end plate is provided with a protrusion for forming a key groove for the Oldham joint 46 separately from the first end plate protrusion 444 and the second end plate protrusion 445. It is preferable to form a keyway for the Oldham joint 46 in the first end plate convex portion 444 and the second end plate convex portion 445.

(5) Modification E
In the scroll compressor according to the present invention, it is preferable to use a movable scroll 540 provided with a movable side end plate 541 having the following features.

  On the outer peripheral side surface 541b of the movable side end plate 541, the center O of the movable scroll 40 is located upstream of the first end plate convex part 44 in the spiral direction A of the movable side wrap 42 and in the vicinity of the first end plate convex part 44. The distance L from the center O of the movable scroll 40 to the outer peripheral end of the movable side wrap 42 is shorter than the distance L from the center O of the movable scroll 40 to the outer periphery of the movable side wrap 42. There is an angle region X longer than the distance D2 to the end (see FIGS. 10 and 11).

  That is, here, the outer peripheral side surface 541b of the movable side end plate 541 is formed on the back surface of the movable side wrap 42 at a location that is not necessary for suppressing refrigerant leakage loss (see FIG. 11). The portion not necessary for suppressing the refrigerant leakage loss here is the angle region B3 (see FIGS. 3 and 7), which is a region on the outer peripheral side from the inner peripheral end of the outermost movable side wrap 42.

  With this configuration, it is particularly easy to reduce the weight of the movable scroll 540, and an efficient scroll compressor is easily realized.

  INDUSTRIAL APPLICABILITY The present invention is widely applicable to a scroll compressor having a symmetrical wrap structure, and is useful because it can reduce a thrust sliding loss while suppressing a refrigerant leakage loss of the scroll compressor.

30 fixed scroll 31 fixed side end plate 31a front side 32,132 fixed side end plate fixed side wrap 40,140,240,340,440,540 movable scroll 41,141,241,341,441,541 movable side end plate 41a movable side end plate Front side 41b, 141b, 241b, 341b, 441b, 541b outer peripheral side surface 42 of movable side end plate 42 movable side wrap 42a outer peripheral end 44, 444 of end of winding of movable side wrap first end plate convex portion 44a, 444a keyway 45, 445 Second end plate convex portion 46 Oldham coupling 100 Scroll compressor 133 Tip seal 133a Outer end side A of tip seal Spiral direction D1 Distance D2 from the center of the movable scroll to the inner peripheral end of the movable side wrap D2 From the center of the movable scroll to the movable side Distance E to the outer peripheral edge of the lap End of winding of the movable wrap Ri unit L center X angular region Sc compression chamber of the distance O orbiting scroll from the center of the movable scroll to the outer peripheral side surface of the movable side end plate

JP-A-8-151984

Claims (7)

A fixed scroll (30) having a fixed side end plate (31) and a spiral fixed side wrap (32, 132) extending from the front surface (31a) of the fixed side end plate;
A movable side end plate (41, 141, 241, 341, 441, 541) and a front side (41a) of the movable side end plate opposite to the front side of the fixed side end plate are combined with the fixed side wrap to form a compression chamber ( A movable scroll (40, 140, 240, 340, 440, 540) having a spiral movable side wrap (42) forming Sc);
A scroll compressor with a symmetrical wrap structure,
Out of the curved outer peripheral side surfaces (41b, 141b, 241b, 341b, 441b, 541b) of the movable side end plate, downstream of the winding end (E) of the movable side wrap in the spiral direction (A) of the movable side wrap And the vicinity of the winding end portion of the movable side wrap is movable relative to the center (O) of the movable scroll than the outer peripheral end (42a) of the winding end portion of the movable side wrap. Located at the center of the scroll,
Scroll compressor (100). The outer peripheral side surfaces (41b, 141b, 441b, 541b) of the movable side end plates (41, 141, 441, 541) are at least partially formed in an arc shape centered on the center (O) of the movable scroll. ing,
The scroll compressor according to claim 1. The movable side end plates (41, 141, 441, 541) are located on the outer side of the winding end portion of the movable side wrap, from the outer peripheral side surfaces (41b, 141b, 441b, 541b) to the center of the movable scroll. Having first end projections (44,444) projecting radially outward,
The scroll compressor according to claim 1 or 2. The outer peripheral side surface (541b) of the movable side end plate (541) is located upstream of the first end plate convex portion (44) in the spiral direction of the movable side wrap and in the vicinity of the first end plate convex portion. Further, a distance (L) from the center of the movable scroll to the outer peripheral side surface (541b) of the movable side end plate is shorter than a distance (D2) from the center of the movable scroll to the outer peripheral end of the movable side wrap, An angle region (X) longer than the distance (D1) from the center of the movable scroll to the inner peripheral end of the movable side wrap exists.
The scroll compressor according to claim 3. An Oldham coupling (46) for preventing rotation of the movable scroll is further provided,
Key grooves (44a, 444a) for the Oldham coupling are formed on the back surface of the first end plate projection (44,444).
The scroll compressor according to claim 3 or 4. A tip seal (133) disposed between a tooth tip of the fixed side wrap (132) and the movable side end plate;
The scroll compressor according to any one of claims 1 to 5. The movable side end plate (141) protrudes radially outward with respect to the center of the movable scroll from the outer peripheral side surface (141b) outside the portion sliding with the outer peripheral side end portion (133a) of the tip seal. The second end plate convex portion (45, 445)
The scroll compressor according to claim 6.

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