JP6437295B2 - Scroll compressor - Google Patents

Description

  The present invention relates to a scroll compressor that handles refrigerant, air, and other compressible gases, and is particularly suitable as a scroll compressor used in a refrigerator or an air conditioner.

  For example, a scroll compressor for refrigeration and air conditioning generally includes a fixed scroll, a turning scroll, and a frame, the fixed scroll is fixed to the frame, and the turning scroll is in a space between the fixed scroll and the frame. A compression mechanism portion is provided which is arranged and configured to rotate while meshing with the fixed scroll.

  In such a scroll compressor, when the orbiting scroll orbits, oil is caught between the outer peripheral surface of the base plate of the orbiting scroll and the inner peripheral surface of the frame, and this oil is stirred by the orbiting motion of the orbiting scroll. As a result, stirring loss increases. Therefore, in the conventional scroll compressor, as described in, for example, JP-A-7-35062 (Patent Document 1) and JP-A-2005-140067 (Patent Document 2), the bitten oil In order to release the oil to the back side of the orbiting scroll, a radiation groove is provided on the lower surface of the outer peripheral portion of the base plate of the orbiting scroll, and the oil is lost to the back side of the orbiting scroll through the radiation groove. Was to reduce.

JP-A-7-35062 Japanese Patent Laid-Open No. 2005-140067

  In the conventional scroll compressors of Patent Documents 1 and 2, in order to reduce the oil stirring loss due to the orbiting motion of the orbiting scroll, a large number of radial grooves are provided in the circumferential direction on the outer peripheral side of the back surface of the orbiting scroll. Yes. For this reason, the rigidity of the base plate of the orbiting scroll is lowered, the base plate of the orbiting scroll is easily deformed, and there is a gap on the end plate surface that is a contact portion between the base plate of the orbiting scroll and the base plate of the fixed scroll. As a result, gas leakage in the middle of the compressor increases, causing a decrease in volumetric efficiency. In order to prevent this reduction in volumetric efficiency, the flatness of the base plate (end plate surface) of the orbiting scroll that slides in contact with the fixed scroll is processed with high accuracy, and the thickness is increased to increase the strength. There was a need to do. For this reason, the conventional scroll compressor requires not only the man-hours for processing a plurality of radiating grooves, but also requires that the base plate be made thick and processed with high precision, and there is a problem that the scroll compressor becomes expensive. It was.

  An object of the present invention is to obtain a scroll compressor that can be manufactured at a low cost by preventing a decrease in volumetric efficiency with a simple structure while reducing oil agitation loss due to an orbiting scroll.

To achieve the above object, the present invention includes a fixed scroll, a turning scroll, and a frame, the fixed scroll is fixed to the frame, and the turning scroll is disposed in a space between the fixed scroll and the frame. A compression mechanism portion configured to rotate while meshing with the fixed scroll, an electric motor portion for driving the compression mechanism portion, and a sealed container that accommodates the compression mechanism portion and the electric motor portion therein. In the scroll compressor provided, a circumferential groove is formed on the inner circumferential surface of the frame facing the outer peripheral surface of the orbiting scroll base plate, and the escape for allowing oil in the circumferential groove to escape to the back side space of the orbiting scroll. A groove is formed in the frame, and the circumferential groove is formed by a continuous circular circumferential groove, and the circumferential groove is a first groove A first circumferential surface of the circular continuous with a diameter, characterized in that it is constituted by a second circumferential surface of the circular continuous with a larger second diameter than said first diameter.

  ADVANTAGE OF THE INVENTION According to this invention, there exists an effect which can obtain the scroll compressor which can prevent the fall of volumetric efficiency and can be manufactured cheaply with a simple structure, reducing the stirring loss of the oil by a turning scroll.

The longitudinal cross-sectional view which shows the whole structure of a scroll compressor. The top view of the flame | frame in Example 1 of the scroll compressor of this invention. FIG. 3 is a cross-sectional view taken along line X1-X1 in FIG. It is sectional drawing of the turning scroll in the scroll compressor of Example 1, and is sectional drawing seen in the arrow direction from the Y1-O-Y1 line | wire of FIG. The rear view (bottom view) of the turning scroll shown in FIG. FIG. 6 is a cross-sectional view of a frame portion corresponding to a portion along the line Y1-O-Y1 in FIG. 5 and a turning scroll. The A section enlarged view of FIG. The top view of the flame | frame in Example 2 of the scroll compressor of this invention. FIG. 9 is a cross-sectional view taken along line X2-X2 in FIG. It is sectional drawing of the turning scroll in the scroll compressor of Example 2, and is sectional drawing seen in the arrow direction from the Y2-O-Y2 line | wire of FIG. FIG. 11 is a rear view (bottom view) of the orbiting scroll shown in FIG. 10. FIG. 12 is a cross-sectional view of a frame portion corresponding to a portion along the line Y2-O-Y2 in FIG. 11 and the orbiting scroll. The B section enlarged view of FIG. The top view of the flame | frame in the conventional scroll compressor. FIG. 15 is a cross-sectional view taken along line X3-X3 in FIG. It is sectional drawing of the turning scroll in the conventional scroll compressor, and sectional drawing seen in the arrow direction from the Y3-O-Y3 line | wire of FIG. FIG. 17 is a rear view (bottom view) of the orbiting scroll shown in FIG. 16. FIG. 18 is a cross-sectional view of a frame portion corresponding to a portion along the line Y3-O-Y3 in FIG. 17 and the orbiting scroll.

  Embodiments of the scroll compressor of the present invention will be described below with reference to the drawings. In FIG. 1 to FIG. 18 described below, the same reference numerals indicate the same or corresponding parts.

A scroll compressor according to a first embodiment of the present invention will be described below with reference to the drawings.
First, an overall configuration of a scroll compressor to which the present embodiment is applied will be described with reference to FIG. Here, a case where the scroll compressor is a scroll compressor for refrigeration air conditioning will be described as an example.

  As shown in FIG. 1, the scroll compressor 1 is configured by storing a compression mechanism unit 2 that performs a compression operation and an electric motor unit (drive unit) 3 for driving the compression mechanism unit 2 in an airtight container 700. Has been.

  The compression mechanism unit 2 includes a fixed scroll 100, a turning scroll 200, and a frame 400 as basic elements. The frame 400 is fixed to a sealed container 700, and a main bearing (rolling bearing) 510 is disposed on the frame 400. Yes.

  The fixed scroll 100 includes a base plate 101, a spiral wrap 102, a suction port 103, and a discharge port 104 as basic components, and is fixed to a frame 400 with bolts (not shown). The wrap 102 is erected vertically on one side of the base plate 101.

  The orbiting scroll 200 includes a base plate 201, a spiral wrap 202, a boss portion 203, and a back pressure hole (not shown) as basic components. The wrap 202 is erected vertically on one side of the base plate 201. The boss 203 is formed so as to protrude from the center of the base plate 201 on the side opposite to the lap (the back side of the orbiting scroll 200).

  A compression chamber 130 is formed by meshing the fixed scroll 100 and the orbiting scroll 200, and the orbiting scroll 200 orbits while meshing with the fixed scroll 100, so that the compression chamber 130 moves toward the center side. The volume is reduced and a compression operation is performed.

  When the orbiting scroll 200 is revolving, a working fluid (in this example, a refrigerant gas) is sucked into the compression chamber 130 through the suction pipe 711 and the suction port 103, and the sucked working fluid is compressed. After that, the gas is discharged from the discharge port 104 of the fixed scroll 100 into the sealed container 700, and further discharged from the discharge pipe 701 to the refrigerant pipe constituting the refrigeration cycle outside the sealed container 700. Further, the space in the sealed container 700 is kept at the discharge pressure.

  The sealed container 700 has an upper cap 710 and a lower cap 720, and a leg 721 is attached to the lower part of the sealed container 700. Further, a hermetic terminal 702 and a terminal cover 703 are provided on the side surface of the hermetic container 700, and electric power is supplied to the electric motor unit 3. The electric motor 600 of the electric motor unit 3 moves the orbiting scroll 200 of the compression mechanism unit 2. It is configured to be able to swivel.

The electric motor unit 3 includes an electric motor 600 including a stator 601 and a rotor 602.
A rotating shaft 300 is fixed to the rotor 602, and the rotating shaft 300 rotates together with the rotor 602. The rotary shaft 300 includes a main shaft portion 302 and a crank pin 301 that is eccentrically formed integrally with an upper end portion of the main shaft portion 302. The crank pin 301 is connected to the boss portion 203 of the orbiting scroll 200. The slewing bearing 210 is engaged.

  Reference numeral 500 denotes an Oldham ring, which is a main part of the rotation prevention mechanism of the orbiting scroll 200, and reference numeral 803 denotes a secondary bearing (rolling bearing) that supports a lower portion (lower side of the electric motor 600) of the rotary shaft 300. The upper part (upper side of the electric motor part 600) is supported by the main bearing 510.

  The orbiting bearing 210 is provided in the orbiting scroll 200 so as to engage the crankpin 301 of the rotating shaft 300 so as to be movable in the thrust direction that is the rotating shaft direction and to be rotatable.

  The auxiliary bearing 803 constitutes a main part of the auxiliary bearing portion 800. The sub-bearing portion 800 includes a lower frame housing 801 fixed to the lower portion in the hermetic container 700 and a sub-bearing housing 802 fixed to the lower frame housing 801 via bolts 805. The auxiliary bearing 803 is inserted into the auxiliary bearing housing 802 from above, and a housing cover 804 is attached above the auxiliary bearing 803.

  A pump portion 900 is attached to the lower end portion of the auxiliary bearing housing 802 via a bolt 910. The pump unit 900 is driven via a pump joint 310 provided at the lower end of the rotary shaft 300.

  The Oldham ring 500 is disposed on the back side of the base plate 201 of the orbiting scroll 200, and two sets of orthogonal key portions are formed on the Oldham ring 500. Of the two sets of key portions of the Oldham ring 500, one set of key portions slides in a key groove 415 (see FIG. 2 and the like) which is a receiving portion of the Oldham ring 500 formed on the frame 400, and the rest. The set of key portions slides in a key groove 260 formed on the back side of the wrap 202 of the base plate 201 of the orbiting scroll 200. As a result, the orbiting scroll 200 orbits within the plane perpendicular to the axial direction, which is the direction in which the scroll wrap 202 stands, without rotating with respect to the fixed scroll 100.

  Since the scroll compressor is configured as described above, when the rotary shaft 300 connected to the electric motor 600 rotates and the crank pin 301 rotates eccentrically, the orbiting scroll 200 The Oldham ring 500 performs a revolving motion without rotating with respect to the fixed scroll 100, and accordingly, the gas flows through the suction pipe 711 and the suction port 103, and the wrap 102 of the fixed scroll 100 and the orbiting scroll. The air is sucked into the compression chamber 130 formed by 200 wraps 202. Further, by the revolving motion of the orbiting scroll 200, the compression chamber 130 compresses the sucked gas by reducing the volume while moving to the center side (center side), and the compressed gas is After being discharged from the outlet 104 to a discharge chamber formed in the upper part of the sealed container 700, it circulates around the compression mechanism part 2 and the electric motor part 3 and is discharged from the discharge pipe 701 to the outside of the compressor. .

  A back pressure chamber 401 is provided on the back side of the base plate 201 of the orbiting scroll 200, and a back pressure hole that allows the compression chamber 130 and the back pressure chamber 401 to communicate with the base plate 201 of the orbiting scroll 200. (Not shown) is provided, and the pressure of the back pressure chamber 401 is configured to be maintained at an intermediate pressure (intermediate pressure) between the suction pressure and the discharge pressure.

  The back pressure chamber 401 formed on the back side of the orbiting scroll 200 is formed as a space surrounded by the orbiting scroll 200, the frame 400 and the fixed scroll 100, and the frame 400 is a back pressure chamber. It also serves as a member for forming 401.

  A seal ring groove 402 is provided in a portion of the frame 400 facing the lower surface of the boss portion 203 of the orbiting scroll 200, and a seal ring 403 is provided in the seal ring groove 402. Inside the seal ring 403, oil in a high pressure (discharge pressure) atmosphere of an oil sump 730 formed in a lower portion of the sealed container 700 described later is an oil passage 311 formed in the rotary shaft 300. The pressure is almost discharged. The seal ring 403 suppresses the discharge pressure fluid (oil or gas) inside the seal ring from flowing into the intermediate pressure back pressure chamber 401 side.

  The orbiting scroll 200 is pressed against the fixed scroll 100 by the resultant force of the intermediate pressure of the back pressure chamber 401 formed outside the seal ring and the discharge pressure acting on the space inside the seal ring 403. ing.

  In FIG. 1, 404 is a balance weight attached to the rotary shaft 300, 405 is a balance weight cover provided so as to cover the balance weight 404, and 406 is a bolt 407 at the lower part of the main bearing 510 in the frame 400. The frame seal 408 attached at 408 is an oil drain pipe. The balance weight cover 405 is attached to the frame 400 together with the frame seal 406 by the bolt 407.

  Reference numeral 105 denotes an end plate surface of the fixed scroll 100, which is a surface that slides with the base plate 201 of the orbiting scroll 200. The end plate surface 105 of the fixed scroll is formed on the outer peripheral side of the compression chamber 130 including a lap portion for forming a compression chamber formed on the outermost periphery.

  Reference numeral 205 denotes an oil supply pocket formed on the lower end surface of the boss portion of the orbiting scroll 200. The oil supply pocket 205 moves inside and outside of the seal ring 403 along with the orbiting motion of the orbiting scroll 200, whereby the seal ring 403 is moved. It is configured to transfer the inner oil or gas to the back pressure chamber 401 side.

  A thrust bearing 520 is provided between the main bearing 510 and the frame seal 406. The oil passage 311 is formed so as to penetrate in the longitudinal direction of the rotating shaft 300, and a part of the oil flowing in the oil passage 311 is put in a portion corresponding to the auxiliary bearing 803 of the rotating shaft 300. A lateral hole 312 for supplying the auxiliary bearing 803 is formed.

Next, an oil supply path to each sliding part in the scroll compressor will be described.
When the rotating shaft 300 is rotated, the oil in the oil reservoir 730 is sent to the oil passage 311 in the rotating shaft by the pump unit 900. Part of the oil sent to the oil passage 311 flows to the auxiliary bearing 803 through the lateral hole 312 and then returns to the oil reservoir 730. The oil that has reached the top of the crankpin 301 through the oil passage 311 passes through the slewing bearing 210 and lubricates the slewing bearing 210 and then flows to the main bearing 510 to lubricate the main bearing 510. To do. Thereafter, the oil passes through the oil drain pipe 408 and returns to the oil sump 730.

  As described above, the refueling pocket 205 provided on the end face of the boss 203 of the orbiting scroll 200 straddles the seal ring 403 (the high-pressure space) as the orbiting scroll 200 revolves. Side) and the outside (back pressure chamber side). As a result, a part of the oil inside the seal ring 403 (oil between the swivel bearing 210 and the main bearing 510) is transferred to the back pressure chamber 401 outside the seal ring 403. The oil conveyed to the back pressure chamber 401 lubricates the sliding portion of the Oldham ring 500 and then is supplied to the sliding surface between the end plate surface 105 of the fixed scroll and the base plate 201 of the orbiting scroll 200.

  The oil conveyed to the back pressure chamber 401 passes through the back pressure hole (not shown) formed in the base plate 201 of the orbiting scroll 200 or on the sliding surface of the end plate surface 105. It flows into the compression chamber 130 through a minute gap. The oil that has flowed into the compression chamber 130 is discharged from the discharge port 104 together with the compressed refrigerant gas, is separated from the gas while flowing through the sealed container 700, and returns to the oil reservoir 730.

Here, the structure of the conventional scroll compressor will be described with reference to FIGS.
14 is a plan view of a frame in a conventional scroll compressor, FIG. 15 is a cross-sectional view taken along line X3-X3 in FIG. 14, and FIG. 16 is a cross-sectional view of a turning scroll in the conventional scroll compressor. FIG. 17 is a rear view (bottom view) of the orbiting scroll shown in FIG. 16, and FIG. 18 corresponds to a portion along the line Y3-O-Y3 of FIG. It is sectional drawing of a frame part and a turning scroll. The basic structure of the conventional scroll compressor is the same as in FIG. 1, and the same parts as those in FIG.

  14 and 15 show the structure of the frame 400. As shown in FIG. 14, the bolt seat 411 on the outer periphery of the frame 400 has a plurality of bolt holes 412 formed at substantially equal intervals in the circumferential direction. By using this bolt hole 412, the fixed scroll 100 is fastened to the frame 400 with fastening bolts (not shown). Reference numeral 414 denotes a gas passage formed in a part of the outer peripheral surface of the frame 400. The gas and oil discharged into the discharge chamber at the upper portion of the sealed container 700 through the gas passage 414 are supplied to the electric motor at the lower portion of the compression mechanism section 2. It is configured to lead to the space where the portion 3 is provided. Reference numeral 409 denotes a seating surface on which the orbiting scroll 200 is seated. As shown in FIG. 14, this seating surface 409 has a key groove 415 with which the key portion of the Oldham ring 500 is engaged, It is provided in a circular shape in the circumferential direction. Dfa is the diameter of the inner peripheral surface of the bolt seat 411 of the frame 400.

  As shown in FIG. 15, a seal ring groove 402 is provided in a portion of the frame 400 facing the lower surface of the boss portion 203 of the orbiting scroll 200, and the rotary shaft 300 penetrates the seal ring groove 402. A circular shape is formed around the hole, and the seal ring 403 is inserted into the seal ring groove 402.

  FIGS. 16 and 17 are views showing the structure of the orbiting scroll 200. As shown in these drawings, on the outer peripheral side of the rear surface of the orbiting scroll 200, there is a key groove 260 with which the key portion of the Oldham ring 500 is engaged. Two locations are provided 180 ° opposite to each other (see FIG. 17). Further, as shown in FIG. 17, a large number of radial grooves 240 extending from the back surface to the outer peripheral surface of the base plate 201 of the orbiting scroll 200 are provided on the outer peripheral side of the rear surface of the orbiting scroll 200.

  Further, a circumferential groove 250 extending in the circumferential direction intersecting with the radial groove 240 and the key groove 260 is formed on the outer peripheral surface (side surface) of the base plate 201 of the orbiting scroll 200. By being formed, a square hole 231 that connects the radial groove 240 and the key groove 260 and the circumferential groove 250 is formed.

  Further, as shown in FIGS. 16 and 17, a plurality of (four in this example) oil supply pockets 205 are formed in the circumferential direction on the lower end surface of the boss portion 203 of the orbiting scroll 200. Note that Ds shown in FIG. 16 is the diameter of the outer peripheral surface of the orbiting scroll base plate 201.

  FIG. 18 is a diagram in which the orbiting scroll 200 is incorporated in a frame 400 portion corresponding to a portion along the line Y3-O-Y3 in FIG. In this figure, Dfa is the diameter of the inner peripheral surface of the bolt seat 411 of the frame 400 shown in FIG. 15, and Ds is the diameter of the outer peripheral surface of the orbiting scroll base plate 201 shown in FIG. La is a gap between the outer peripheral surface of the orbiting scroll base plate 201 and the inner peripheral surface of the bolt seat 411 of the frame 400.

  In the scroll compressor 1, when the orbiting scroll 200 orbits, oil bites into the gap La between the outer peripheral surface of the base plate 201 of the orbiting scroll 200 and the frame 400, and this oil orbits the orbiting scroll 200. Stirring loss increases with stirring. In order to reduce the stirring loss, the radiation groove 240 is provided.

  That is, when the orbiting scroll 200 orbits, the oil that bites into the gap La between the outer peripheral surface of the base plate 201 of the orbiting scroll 200 and the inner peripheral surface of the frame 400 passes through the radiation groove 240 and By letting it escape to the back side, stirring loss is reduced.

  However, in the conventional scroll compressor configured as described above, as described above, since the multiple radial grooves 240 and the like are provided on the back surface of the orbiting scroll base plate, the orbiting scroll base plate 201 has low rigidity. Thus, a gap is generated between the orbiting scroll base plate 201 and the fixed scroll end plate surface 105, gas leakage increases, and volume efficiency decreases. In order to prevent this reduction in volumetric efficiency, it is necessary to process the flatness of the orbiting scroll base plate 201 with high precision, and not only the number of processing steps of the radiation groove 240 but also high precision processing of the base plate is necessary. There is a problem of becoming something.

  Therefore, in the first embodiment of the present invention, in order to provide a scroll compressor that can be manufactured at low cost while preventing a decrease in volumetric efficiency with a simple structure while reducing oil agitation loss due to orbiting scroll, the following FIG. -It is set as the structure demonstrated in FIG. 2 is a plan view of a frame in the first embodiment of the scroll compressor of the present invention, FIG. 3 is a cross-sectional view taken along line X1-X1 in FIG. 2, and FIG. 4 is a cross-sectional view of the orbiting scroll in the scroll compressor of the first embodiment. 5 is a cross-sectional view taken in the direction of the arrow from the Y1-O-Y1 line in FIG. 5, FIG. 5 is a rear view (bottom view) of the orbiting scroll shown in FIG. 4, and FIG. 6 is a Y1-O-Y1 line in FIG. FIG. 7 is an enlarged view of a portion A in FIG. 6.

  In these drawings, the portions denoted by the same reference numerals as those in FIGS. 1 and 14 to 18 described above are the same or corresponding portions, and the description of the same portions is omitted.

  2 and 3 are diagrams showing the structure of the frame 400 in the first embodiment. Also in this embodiment, as shown in FIG. 2, a plurality of bolt holes 412 are formed at substantially equal intervals in the circumferential direction in the bolt seat 411 formed on the outer peripheral portion of the frame 400. 14 is the same as the conventional scroll compressor shown in FIG. 14 in that the fixed scroll 100 is fastened to the frame 400 with fastening bolts.

  However, in the present embodiment, the inside of the frame 400 between the bolt seats 411 at the bolt hole 412 portions provided at substantially equal intervals in the circumferential direction, that is, between the bolt holes 412 facing the outer peripheral surface of the orbiting scroll 200. A circumferential groove (circumferential groove) 410 is provided on each circumferential surface. In addition, oil in the circumferential groove is released to the space on the back side of the orbiting scroll in the portion of the frame 400 on the inner periphery side of the bolt seat corresponding to the portion of the bolt seat 411 that forms the bolt hole 412. A relief groove 413 is formed.

  2 and 3, Dfa is the inner peripheral surface diameter of the bolt seat 411 portion in the bolt hole 412 portion of the frame 400, and Dfb is the inner diameter of the circumferential groove 410 portion.

  4 and 5 are diagrams showing the structure of the orbiting scroll 200. FIG. In this embodiment, the orbiting scroll 200 includes a number of radial grooves 240 extending from the back surface to the outer peripheral surface of the base plate 201 of the orbiting scroll 200 as shown in the conventional scroll compressor shown in FIGS. Further, the circumferential groove 250 formed on the outer peripheral surface of the orbiting scroll base plate, the square hole 231 that communicates the radiation groove and the circumferential groove, and the like are not formed. Only the keyway 260 to be engaged is formed. Note that Ds shown in FIG. 4 is the diameter of the outer peripheral surface of the orbiting scroll base plate 201.

  FIG. 6 is a diagram in which the orbiting scroll 200 is incorporated in a frame 400 portion corresponding to a portion along the line Y1-O-Y1 in FIG. In this figure, Dfa is the diameter of the inner peripheral surface of the bolt seat 411 in the bolt hole 412 portion of the frame 400 shown in FIGS. 2 and 3, and Dfb is the diameter of the circumferential groove 410 portion. Further, La is a clearance between the outer peripheral surface of the orbiting scroll base plate 201 and the inner peripheral surface of the bolt seat 411 at the bolt hole 412, and Lb is a clearance between the outer peripheral surface of the orbiting scroll base plate 201 and the circumferential groove 410.

  7 is an enlarged view of a portion A in FIG. 6, and the oil accumulated in the circumferential groove 410 passes through a relief groove 413 (see FIG. 2) formed on the seating surface 409 of the orbiting scroll 200. It is configured so that it can easily escape to the back pressure chamber 401 on the back of the orbiting scroll 200.

  In the scroll compressor 1, as described above, when the orbiting scroll 200 orbits, oil bites into the gap between the outer peripheral surface of the base plate 201 of the orbiting scroll 200 and the bolt seat 411 formed on the frame 400. The oil is agitated by the orbiting motion of the orbiting scroll 200, and the agitation loss increases. In order to reduce this stirring loss, in this embodiment, a circumferential groove is formed between the inner peripheral surface of the frame 400 facing the outer peripheral surface of the orbiting scroll base plate 201, that is, between the bolt seats 411 of the bolt hole 412. 410 is formed. As a result, oil caught in the gap between the outer peripheral surface of the orbiting scroll base plate 201 and the frame 400 is released in the circumferential direction by the circumferential groove 410, and further, the outer peripheral surface of the orbiting scroll base plate 201 and the inner peripheral surface of the frame 400 The oil can be released to the space on the back side of the orbiting scroll from the portion where the gap is larger. Therefore, according to the present embodiment, since the stirring loss can be reduced, the volumetric efficiency can be prevented from being lowered and the efficiency of the scroll compressor can be improved.

  Further, according to this embodiment, unlike the conventional scroll compressor, it is not necessary to provide a large number of radial grooves 240, circumferential grooves 250, square holes 231 and the like on the base plate of the orbiting scroll. Since the rigidity of 201 can be prevented from being lowered and the flatness of the orbiting scroll base plate 201 need not be processed with high accuracy, the processing cost can be reduced and the scroll compressor can be manufactured at low cost. In addition, according to the present embodiment, since the rigidity of the orbiting scroll base plate 201 can be prevented from being lowered, the deformation of the orbiting scroll base plate 201 in contact with the fixed scroll 100 can be prevented without increasing the thickness of the base plate 201. It can be ensured satisfactorily. Therefore, gas leakage from the contact portion between the orbiting scroll base plate 201 and the end plate surface 105 of the fixed scroll base plate 201 can be suppressed, and volume efficiency can be improved from this point.

  Further, according to this embodiment, the oil in the circumferential groove 410 is applied to the frame portion (the seating surface 409) on the inner periphery side of the bolt seat corresponding to the portion of the bolt seat 411 forming the bolt hole 412. An escape groove 413 is formed in the rear side space of the orbiting scroll for escape. Accordingly, the oil that is caught between the outer peripheral surface of the base plate of the orbiting scroll 200 and the inner peripheral surface of the frame 400 and flows into the circumferential groove 410 is smoothly released from the escape groove 413 to the back side space of the orbiting scroll. As a result, an effect of further reducing the stirring loss and further improving the efficiency of the scroll compressor can be obtained.

  The circumferential groove 410 can be produced when the frame 400 is produced by casting, and the circumferential groove 410 produced by casting is produced as a non-machined surface as the material of the material. Therefore, even if the circumferential groove 410 is formed, the processing cost is hardly increased. From this point, the scroll compressor can be manufactured at a low cost.

  A scroll compressor according to a second embodiment of the present invention will be described with reference to FIGS. 8 is a plan view of a frame in the second embodiment of the scroll compressor of the present invention, FIG. 9 is a cross-sectional view taken along the line X2-X2 in FIG. 8, and FIG. 10 is a cross-sectional view of the orbiting scroll in the scroll compressor of the second embodiment. 11 is a cross-sectional view taken in the direction of the arrow from the line Y2-O-Y2 in FIG. 11, FIG. 11 is a rear view (bottom view) of the orbiting scroll shown in FIG. 10, and FIG. 12 is a line Y2-O-Y2 in FIG. FIG. 13 is an enlarged view of a portion B in FIG. 12.

  In these drawings, the parts denoted by the same reference numerals as those in FIGS. 1 to 7 and FIGS. 14 to 18 are the same or corresponding parts, and the description of the same parts is omitted.

  8 and 9 are diagrams showing the structure of the frame 400 in the second embodiment. Also in this embodiment, as shown in FIG. 8, a plurality of bolt holes 412 are formed at substantially equal intervals in the circumferential direction in the bolt seat 411 formed on the outer peripheral portion of the frame 400. 14 is the same as the conventional scroll compressor shown in FIG. 14 and the scroll compressor shown in the first embodiment shown in FIG. 2 in that the fixed scroll 100 is fastened to the frame 400 with fastening bolts.

  As shown in FIGS. 8 and 9, the second embodiment is different from the first embodiment in that a circular portion is formed in a portion of the inner peripheral surface of the bolt seat 411 of the frame 400 facing the outer peripheral surface of the orbiting scroll 200. The circumferential groove (circumferential groove) 420 is provided. In the first embodiment, the circumferential groove is constituted by a plurality of circumferential grooves 410 formed between the bolt holes 412. However, in the second embodiment, the circumferential groove is a single circular circumferential groove 420. That is, it is formed by a circumferential groove.

In the present embodiment, the circumferential groove (circumferential groove) 420 includes a first circumferential surface 421 having a first diameter and a second diameter having a second diameter larger than the first diameter. It is comprised by the circumferential surface 422 of this. That is, the circumferential groove 420 includes a first circumferential surface 421 formed by a diameter (first diameter) Dfa of an inner circumferential surface of the bolt seat 411 of the frame 400 and a first circumferential surface 421 larger than the first diameter Dfa. The second circumferential surface 422 is formed with a diameter Dfc of 2. Further, the second circumferential surface 422 is provided below the first circumferential surface 421 .

  10 and 11 are diagrams showing the structure of the orbiting scroll 200. FIG. Also in this embodiment, the structure of the orbiting scroll 200 is the same as that of the orbiting scroll in the first embodiment shown in FIGS. 4 and 5 described above. In addition, Ds shown in FIG. 10 is the diameter of the outer peripheral surface of the orbiting scroll base plate 201.

  FIG. 12 is a diagram in which the orbiting scroll 200 is incorporated in a frame 400 portion corresponding to a portion along the line Y2-O-Y2 in FIG. In this figure, Dfa, Dfc, and Ds are the same as those shown in FIGS. Lc is a gap between the outer peripheral surface of the orbiting scroll base plate 201 and the circumferential groove 410 (the bottom thereof).

  FIG. 13 is an enlarged view of a portion B in FIG. 12, and the oil caught between the outer peripheral surface of the orbiting scroll base plate 201 and the inner peripheral surface of the frame 400 passes through a circumferential groove (circumferential groove) 420. After flowing in the circumferential direction, it can be easily released to the back pressure chamber 401 on the back surface of the orbiting scroll 200.

  Also in the second embodiment, the same effect as in the first embodiment can be obtained. That is, it is possible to reduce agitation loss by agitating the oil biting between the outer peripheral surface of the orbiting scroll base plate 201 and the inner peripheral surface of the frame 400. Further, since the orbiting scroll 200 does not need to be provided with a large number of radial grooves, circumferential grooves, square holes and the like as in the prior art, the lowering of the rigidity of the orbiting scroll base plate 201 is suppressed and deformation of the base plate 201 is prevented. it can. Therefore, there is no need to process the flatness of the orbiting scroll base plate 201 with high accuracy, and an effect that a scroll compressor can be manufactured at low cost can be obtained.

  Furthermore, according to the second embodiment, since the circumferential groove 420 is formed as a circumferential groove having a uniform cross-sectional area in the circumferential direction, the outer peripheral surface of the orbiting scroll base plate 201 and the inner peripheral surface of the frame 400 are arranged. There is also an effect that the oil biting in between can be smoothly discharged in the circumferential direction via the circumferential groove 420. In order to configure as in the second embodiment, it is necessary to form the circumferential groove 420 on the inner diameter side with respect to the bolt hole 412, so the outer diameter of the frame 400 is larger than that in the first embodiment. Therefore, when it is desired to reduce the size of the scroll compressor, the configuration of the first embodiment is preferable. On the other hand, the second embodiment only has to form a single circumferential groove (circumferential groove), so that there is an advantage that the processing becomes easy when it is manufactured by machining.

In addition, this invention is not limited to the Example mentioned above, Various modifications are included. Further, a part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment.
Further, the above-described embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described.

1: scroll compressor, 2: compression mechanism, 3: electric motor,
100: fixed scroll, 101: base plate, 102: lap,
103: suction port, 104: discharge port,
105: End plate surface of fixed scroll, 130: Compression chamber,
200: Orbiting scroll, 201: Base plate, 202: Lap, 203: Boss part,
205: Refueling pocket, 210: Slewing bearing, 231: Square hole, 240: Radiation groove,
250: circumferential groove, 260: key groove,
300: Rotating shaft, 301: Crank pin, 302: Main shaft part,
310: Pump joint, 311: Oil passage in the rotating shaft, 312: Side hole,
400: Frame, 401: Back pressure chamber, 402: Seal ring groove, 403: Seal ring,
404: Balance weight, 405: Balance weight cover,
406: Frame seal, 407: Bolt, 408: Oil drain pipe,
409: seating surface, 410: circumferential groove, 411: bolt seat, 412: bolt hole,
413: Escape groove, 414: Gas passage, 415: Key groove,
420: circumferential groove (circumferential groove), 421: first circumferential surface, 422: second circumferential surface,
500: Oldham ring, 510: Main bearing (rolling bearing), 520: Thrust bearing,
600: Electric motor, 601: Stator, 602: Rotor,
700: Airtight container, 701: Discharge pipe, 702: Hermetic terminal, 703: Terminal cover,
710: upper cap, 711: suction pipe, 720: lower cap, 721 leg,
730: oil sump,
801 lower frame housing, 800: auxiliary bearing, 802: housing,
803: Secondary bearing (rolling bearing), 804: Housing cover, 805: Bolt,
900: Pump part, 910: Bolt,
Ds: Diameter of the outer peripheral surface of the orbiting scroll base plate,
Dfa: the diameter of the inner peripheral surface of the bolt seat of the frame (the diameter of the first circumferential surface),
Dfb: the diameter of the circumferential groove part,
Dfc: diameter of the circumferential groove portion (diameter of the second circumferential surface),
La: A clearance between the outer peripheral surface of the orbiting scroll base plate and the inner peripheral surface of the bolt seat at the bolt hole portion,
Lb: A gap between the outer peripheral surface of the orbiting scroll base plate and the circumferential groove,
Lc: A gap between the outer peripheral surface of the orbiting scroll base plate and the circumferential groove.

Claims (5)

A fixed scroll, a turning scroll, and a frame are provided, and the fixed scroll is fixed to the frame, and the turning scroll is disposed in a space between the fixed scroll and the frame so as to make a turning motion while meshing with the fixed scroll. In a scroll compressor comprising: a compression mechanism portion configured as follows; an electric motor portion for driving the compression mechanism portion; and a sealed container that accommodates the compression mechanism portion and the electric motor portion inside.
A circumferential groove is formed on the inner peripheral surface of the frame facing the outer peripheral surface of the base plate of the orbiting scroll ,
A relief groove is formed in the frame for allowing the oil in the circumferential groove to escape to the back side space of the orbiting scroll; and
The circumferential groove is formed by a continuous circular circumferential groove, and the circumferential groove is a continuous circular first circumferential surface having a first diameter and larger than the first diameter. A scroll compressor comprising a continuous circular second circumferential surface having a second diameter .   2. The scroll compressor according to claim 1, wherein a portion of the circumferential groove is a non-machined surface with the material forming the frame. 3. 3. The scroll compressor according to claim 2 , wherein the frame is manufactured by casting, the circumferential groove is manufactured when the frame is manufactured by casting, and a portion of the circumferential groove is manufactured by casting. A scroll compressor characterized by keeping the material. 2. The scroll compressor according to claim 1 , wherein the second circumferential surface is formed below the first circumferential surface. 3. 5. The scroll compressor according to claim 4 , wherein the first circumferential surface forming the circumferential groove is formed by a bolt seat inner circumferential surface of the frame.

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