Scroll compressor

Abstract

To obtain a scroll compressor which enables suppression of an amount of a lubrication oil flowing out from an oil pipe, moved up, and suctioned to the outside of the scroll compressor.SOLUTION: A scroll compressor has a frame for supporting an oscillating scroll in a manner that allows oscillation. The frame has an oil return hole formed for discharging an extra portion of a lubrication oil supplied to a part between the oscillating scroll and the frame to an area below the frame. The scroll compressor includes: an oil pipe which is connected at an upstream end to the oil return hole and guides the lubrication oil discharged from the oil return hole downward; and a fluid guide part which is disposed facing an outlet of a suction pipe and guides a fluid flowing out from the outlet and suctioned into a closed vessel downward. An outer peripheral part of a motor has a plurality of fluid passages penetrating through the outer peripheral part in a vertical direction. At least one of the fluid passages is a downward passage in which the fluid guided by the fluid guide part passes downward, and a downstream end of the oil pipe is located at the downward passage.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to a scroll compressor having an oil pipe. [Background technology]

[0002] A conventional scroll compressor has a compression mechanism having a fixed scroll and an orbiting scroll, a frame that slidably supports the orbiting scroll, and a sealed container that houses the compression mechanism and the frame (see, for example, Patent Document 1). The scroll compressor of Patent Document 1 has an oil pipe that has one end connected to the frame and the other end extending downward, and is configured to discharge lubricating oil that has accumulated in the internal space of the frame from the internal space. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2020 / 157792 Summary of the Invention [Problem to be solved by the invention]

[0004] The scroll compressor described in Patent Document 1 had a problem in which some of the lubricating oil flowing out of the oil pipe was picked up by the upward flow of the suctioned refrigerant that had flowed into the sealed container as it returned to the oil reservoir at the bottom of the sealed container, and was then sucked into the compression mechanism together with the refrigerant and discharged out of the compressor.

[0005] The present disclosure is intended to solve the above-mentioned problems, and has an object to provide a scroll compressor that can suppress the amount of lubricating oil that flows out of an oil pipe and is scooped up. [Means for solving the problem]

[0006] The scroll compressor according to the present disclosure includes a sealed container having an oil reservoir formed at the bottom for storing lubricating oil, a fixed scroll arranged at an upper part within the sealed container, an orbiting scroll arranged below the fixed scroll and forming a compression chamber together with the fixed scroll, a frame arranged below the orbiting scroll and slidably supporting the orbiting scroll, a motor arranged below the frame, a drive shaft connecting the motor and the orbiting scroll and transmitting the driving force of the motor to the orbiting scroll, an oil pump arranged on the drive shaft and supplying the lubricating oil from the oil reservoir between the orbiting scroll and the frame through an oil supply hole formed in the drive shaft, and an oil pump connected to the sealed container so that an outlet opens into a space between the frame and the motor and sealingly extends from the outlet. a suction pipe that guides fluid into the inside of a closed container, and an oil return hole formed in the frame that discharges excess lubricating oil supplied by an oil pump between the orbiting scroll and the frame below the frame, and an oil pipe whose upstream end is connected to the oil return hole and guides the lubricating oil discharged from the oil return hole downward, and a fluid guide part that is arranged opposite the outlet of the suction pipe and guides downward the fluid that flows out from the outlet and is sucked into the closed container, and a plurality of fluid flow paths that penetrate in the vertical direction are formed on the outer periphery of the motor, and at least one of the plurality of fluid flow paths is a downward flow path through which the fluid guided by the fluid guide part passes downward, and the downstream end of the oil pipe is located in the downward flow path. [Effects of the Invention]

[0007] The scroll compressor according to the present disclosure can suppress the amount of lubricating oil that flows out from the oil pipe and is stirred up. [Brief explanation of the drawings]

[0008] [Figure 1] 1 is a vertical cross-sectional view of a scroll compressor according to a first embodiment. [Figure 2] 1 is a cross-sectional view of a motor portion of a scroll compressor according to a first embodiment. [Figure 3]2 is a perspective view of a fluid guide portion, an oil pipe, a frame, and a suction pipe of the scroll compressor according to the first embodiment. FIG. [Figure 4] FIG. 4 is a perspective view of FIG. 3 as seen from below. [Figure 5] FIG. 4 is a side view of FIG. 3. [Figure 6] FIG. 4 is a bottom view of FIG. 3. [Figure 7] FIG. 4 is a perspective view of FIG. 3 with the suction pipe removed. [Figure 8] FIG. 8 is a perspective view of FIG. 7 as seen from below. [Figure 9] 2 is a perspective view of a fluid guide portion of the scroll compressor according to the first embodiment. FIG. [Figure 10] 10 is a perspective view showing a state in which an oil pipe is fixed to the fluid guide portion of FIG. 9. FIG. [Figure 11] FIG. 11 is a perspective view of FIG. 10 as seen from above. [Figure 12] FIG. 4 is a diagram showing a fluid flow in a scroll compressor of a comparative example. [Figure 13] FIG. 10 is a vertical cross-sectional view of a scroll compressor according to a second embodiment. [Figure 14] 14 is a perspective view of the fluid guide portion, the oil pipe, the frame, and the suction pipe of FIG. 13, as viewed from below. FIG. [Figure 15] FIG. 15 is a cross-sectional view of an oil pipe portion in FIG. [Figure 16] FIG. 10 is a bottom view of the frame of the scroll compressor of the comparative example. [Figure 17] FIG. 11 is a view of a frame of a scroll compressor according to a third embodiment, viewed from below. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In each drawing, identical or corresponding parts are denoted by the same reference numerals, and their description will be omitted or simplified as appropriate. Furthermore, the shape, size, arrangement, etc. of the configurations shown in each drawing may be modified as appropriate within the scope of the present disclosure.

[0010] Embodiment 1 Fig. 1 is a longitudinal sectional view of scroll compressor 100 according to embodiment 1. Fig. 2 is a transverse sectional view of a motor 139 portion of scroll compressor 100 according to embodiment 1. Note that the fluid in the following description is, for example, a refrigerant, which is different from lubricating oil.

[0011] [Configuration of scroll compressor 100] The scroll compressor 100 has a sealed container 102 that forms an outer shell, a suction pipe 103 that draws fluid into the sealed container 102 from outside, and a discharge pipe 104 that discharges the compressed fluid. The scroll compressor 100 has a subframe 110 that defines the internal space of the sealed container 102, an oil reservoir 131 that stores lubricating oil, a fixed scroll 10 that compresses the fluid, and an orbiting scroll 11 that compresses the fluid. The scroll compressor 100 has a frame 15 that slidably supports the orbiting scroll 11, a drive shaft 12 that rotates the orbiting scroll 11, and an oil pump 91 that supplies lubricating oil from the oil reservoir 131 to various parts that require lubrication. In the following description, the direction in which the drive shaft 12 extends is referred to as the axial direction, the direction perpendicular to the axial direction is referred to as the radial direction, and the direction around the rotation axis is referred to as the circumferential direction.

[0012] The scroll compressor 100 has a motor 139 that rotates the drive shaft 12, an Oldham coupling 20 that causes the orbiting scroll 11 to oscillate, and a balancer cover 21 that covers from above the rotational locus of a first balancer 13 that is provided on the drive shaft 12. The scroll compressor 100 also has an oil pipe 18 that guides lubricating oil discharged from an oil return hole 15d formed in the frame 15 to below the motor 139, and a fluid guide section 30 that guides fluid that has been sucked into the sealed container 102 from the suction pipe 103 downward.

[0013] The scroll compressor 100 has a compression chamber 53, a suction chamber 54, and an oil inlet chamber 55. The compression chamber 53 is a chamber that compresses a fluid and is formed by a fixed scroll body 10b (described later) of the fixed scroll 10 and a swing scroll body 11b (described later) of the swing scroll 11. The suction chamber 54 is a chamber into which fluid is drawn from the outside and is formed by the inner surface of the frame 15 and the outer peripheries of the fixed scroll 10 and the swing scroll 11. The suction chamber 54 is connected to the compression chamber 53, and the fluid drawn into the suction chamber 54 flows into the compression chamber 53 and is compressed. The oil inlet chamber 55 is a chamber into which lubricating oil flows and is formed by the inner surface of the lower part of the frame 15 and the lower part of the swing scroll 11.

[0014] (sealed container 102) The sealed container 102 constitutes the outer shell of the scroll compressor 100. At least the fixed scroll 10, the orbiting scroll 11, the frame 15, the drive shaft 12, the motor 139, and the Oldham coupling 20 are provided inside the sealed container 102. A suction pipe 103 communicating with the internal space of the sealed container 102 below the frame 15 is connected to the side of the sealed container 102, and a discharge pipe 104 communicating with the compression chamber 53 is connected to the upper part of the sealed container 102.

[0015] The internal space of the sealed container 102 has a first space 100a, a second space 100b, and a third space 100c. The first space 100a is a space between the frame 15 and the motor 139 in the axial direction, and is a space where the outlet 103a of the suction pipe 103 opens. The second space 100b is a space above the fixed scroll 10, and is a space into which the fluid compressed in the compression chamber 53 is discharged. The third space 100c is a space between the motor 139 and the subframe 110 in the axial direction, and is a space into which the fluid guided from the first space 100a to cool the motor 139 flows and turns back.

[0016] (Suction pipe 103) The suction pipe 103 is a pipe for guiding the fluid flowing into the scroll compressor 100 into the sealed container 102. The suction pipe 103 is provided below the frame 15 and penetrates the side of the sealed container 102. An outlet 103a of the suction pipe 103 opens into the first space 100a and guides the fluid into the first space 100a.

[0017] (Discharge pipe 104) The discharge pipe 104 is a pipe for discharging the fluid compressed by the scroll compressor 100. The discharge pipe 104 is provided to penetrate the upper part of the sealed container 102 so as to communicate with the compression chamber 53.

[0018] (Subframe 110) The sub-frame 110 rotatably holds the drive shaft 12 via the bearing 90. The drive shaft 12 passes through the center of the sub-frame 110.

[0019] (Oil Sump 131) The oil sump 131 stores lubricating oil. This oil sump 131 is formed at the bottom of the sealed container 102, and the lubricating oil is sealed in it to a height that exceeds the height of the subframe 110, for example. An oil pump 91 (described later) provided at the lower end of the drive shaft 12 is immersed in the oil sump 131. The lubricating oil in the oil sump 131 is drawn up by the oil pump 91 and supplied to each part that requires lubrication via an oil supply hole 12b (described later) formed in the drive shaft 12.

[0020] (Fixed Scroll 10) The fixed scroll 10 compresses the fluid together with the orbiting scroll 11. The fixed scroll 10 is disposed axially opposite the orbiting scroll 11. The fixed scroll 10 has a fixed base plate 10a that is substantially parallel to the horizontal plane, and a fixed spiral body 10b that is formed to protrude downward from the lower surface of the fixed base plate 10a.

[0021] The fixed base plate 10a, together with the fixed scroll 10b, the oscillating scroll 11, and the frame 15, constitutes the compression chamber 53 and the suction chamber 54. The fixed base plate 10a is a flat plate-shaped member, and has a discharge port 10c formed in its approximate center for discharging the fluid compressed in the compression chamber 53. The fixed base plate 10a is also approximately parallel to the horizontal plane, and the outer periphery of the lower surface of the fixed base plate 10a is fixed to the upper part of the frame 15.

[0022] The fixed scroll 10b forms a compression chamber 53 together with the swing scroll 11b of the swing scroll 11. The fixed scroll 10b also forms a suction chamber 54 together with the frame 15 and the swing scroll 11. The horizontal cross section of the fixed scroll 10b has a spiral shape.

[0023] (Swing Scroll 11) The orbiting scroll 11 compresses the fluid together with the fixed scroll 10. The orbiting scroll 11 is disposed axially opposite the fixed scroll 10. The orbiting scroll 11 has an orbiting base plate 11a that is substantially parallel to the horizontal plane, an orbiting spiral body 11b formed to protrude upward from the upper surface of the orbiting base plate 11a, a boss portion 11j formed on the lower side of the orbiting base plate 11a, and a bearing 11c to which the upper end of the drive shaft 12 is connected.

[0024] The oscillating bed plate 11a, together with the oscillating scroll 11b, the fixed scroll 10, and the frame 15, constitutes the compression chamber 53 and the suction chamber 54. The oscillating bed plate 11a is a disk-shaped member that oscillates within the frame 15 as the drive shaft 12 rotates. The oscillating bed plate 11a is substantially parallel to the horizontal plane and is provided on the frame 15 so as to be able to oscillate. That is, the oscillating bed plate 11a is able to oscillate on the frame 15 as the drive shaft 12 rotates. More specifically, the oscillating bed plate 11a is provided on a thrust plate 16 that is arranged between the oscillating bed plate 11a and the frame 15 so as to be able to oscillate.

[0025] A first recess 11f and a second recess 11g are formed on the underside of the oscillating base plate 11a, recessed toward the upper side. The first recess 11f and the second recess 11g are formed on approximately the same straight line and are formed to extend from the center side of the oscillating base plate 11a toward the outer periphery side.

[0026] The oscillating scroll 11b compresses the fluid together with the fixed scroll 10b of the fixed scroll 10. The oscillating scroll 11b, together with the oscillating base plate 11a and the fixed scroll 10, forms a compression chamber 53, and together with the frame 15 and the fixed scroll 10, forms a suction chamber 54. The oscillating scroll 11b has a spiral shape in horizontal cross section, which corresponds to the horizontal cross-sectional shape of the fixed scroll 10b.

[0027] The boss portion 11j is a hollow cylindrical member formed on the lower side of the oscillating base plate 11a. A bearing 11c is provided on the boss portion 11j. The bearing 11c is connected to the upper end of the drive shaft 12. In other words, the boss portion 11j is connected to the drive shaft 12 via the bearing 11c, and the rotation of the drive shaft 12 is transmitted to the oscillating scroll 11.

[0028] (Frame 15) The frame 15 supports the orbiting scroll 11 so that the orbiting scroll 11 can slide on a thrust plate 16 provided within the frame 15. The frame 15 has an open top and bottom. The top of the frame 15 is closed by a fixed base plate 10a of the fixed scroll 10. A main bearing 15c that rotatably holds the drive shaft 12 is provided in the bottom of the frame 15. The frame 15 is formed with an intake port 15a for guiding fluid to the intake chamber 54, a thrust support surface 15b that supports the thrust plate 16, and an oil inlet chamber 55 into which lubricating oil flowing out from an oil supply hole 12b (described below) of the drive shaft 12 flows. The frame 15 is also formed with an oil return hole 15d for discharging a portion of the lubricating oil from the oil inlet chamber 55.

[0029] The suction port 15a is a hole formed to communicate between the first space 100a and the suction chamber 54 in the frame 15. The fluid that flows into the first space 100a from the suction pipe 103 flows into the suction chamber 54 through the suction port 15a.

[0030] The thrust support surface 15b supports the thrust plate 16. The thrust support surface 15b is a flat portion formed in the middle of the frame 15 in the vertical direction.

[0031] The oil inlet chamber 55 is a chamber into which lubricating oil flowing out from the oil supply hole 12b of the drive shaft 12 flows, and is formed in the lower part of the frame 15, i.e., a chamber formed by the inner surface of the lower part of the frame 15 and the boss portion 11j of the oscillating scroll 11.

[0032] The oil return hole 15d is a hole formed to communicate between the oil inlet chamber 55 in the frame 15 and a first space 100a below the frame 15 in the scroll compressor 100. The oil return hole 15d is formed, for example, to penetrate the frame 15 in the vertical direction. Excess lubricating oil that has flowed into the oil inlet chamber 55 is discharged into the first space 100a through the oil return hole 15d.

[0033] The thrust plate 16, a component of the frame 15, slidably supports the orbiting scroll 11. The thrust plate 16 is sandwiched between the lower surface of the orbiting base plate 11a of the orbiting scroll 11 and a thrust support surface 15b of the frame 15. That is, the orbiting base plate 11a of the orbiting scroll 11 is provided on the upper surface of the thrust plate 16, and the orbiting base plate 11a is slidable on the upper surface of the thrust plate 16. The thrust plate 16 is formed with a first oil hole 16a and a second oil hole 16b that penetrate in the axial direction.

[0034] (Drive shaft 12) The drive shaft 12 is a shaft connected to the orbiting scroll 11. The drive shaft 12 connects the orbiting scroll 11 and a motor 139, and transmits the driving force of the motor 139 to the orbiting scroll 11. An eccentric portion 12a is formed at the upper end of the drive shaft 12, and is connected to a bearing 11c of the orbiting scroll 11. The eccentric portion 12a is formed such that the axis of the eccentric portion 12a is horizontally offset by a predetermined amount from the axis of the drive shaft 12. An oil supply hole 12b is formed inside the drive shaft 12 to introduce lubricating oil.

[0035] Oil feed hole 12b is for guiding lubricating oil to each sliding portion of scroll compressor 100. Oil feed hole 12b is formed inside drive shaft 12 and extends in the vertical direction. Oil feed hole 12b communicates with oil reservoir 131 provided in the lower portion of scroll compressor 100, and is capable of guiding lubricating oil stored in oil reservoir 131 to each sliding portion. Although not shown, oil feed hole 12b branches in the horizontal direction, so that the lubricating oil from oil feed hole 12b is also supplied to oil inlet chamber 55 formed in the lower portion of frame 15.

[0036] In addition, a first balancer 13 is provided on the drive shaft 12 at a position between the frame 15 and the motor 139. This first balancer 13, together with a second balancer 14 provided below the rotor 129 of the motor 139, prevents deflection of the drive shaft 12 caused by the swinging motion of the orbiting scroll 11. In other words, the first balancer 13 and the second balancer 14 not only provide static balance, but also dynamically balance the moment of inertia caused in the drive shaft 12 and the rotor 129 caused by the swinging motion of the orbiting scroll 11.

[0037] (Oil pump 91) The oil pump 91 is provided at the lower end of the drive shaft 12 and supplies lubricating oil from the oil sump 131 through the oil supply hole 12b of the drive shaft 12 to various parts requiring lubrication. The various parts requiring lubrication include the bearing 11c and the main bearing 15c. The lubricating oil supplied to the bearing 11c is supplied between the orbiting scroll 11 and the frame 15. In other words, the oil pump 91 supplies the lubricating oil from the oil sump 131 through the oil supply hole 12b of the drive shaft 12 to between the orbiting scroll 11 and the frame 15. The oil pump 91 may be, for example, a centrifugal pump or a positive displacement pump, which generates a pumping action due to a pressure difference when the drive shaft 12 rotates.

[0038] (Motor 139) The motor 139 rotates the drive shaft 12. The motor 139 is provided below the frame 15. The driving force of the motor 139 is transmitted to the orbiting scroll 11 via the drive shaft 12. The motor 139 has a stator 109 fixedly supported on the sealed container 102 and a rotor 129 that generates torque when combined with the stator 109. The stator 109 is configured, for example, by mounting multi-phase windings on a laminated iron core. The rotor 129 has, for example, a permanent magnet (not shown) inside and is held with a predetermined gap between it and the inner wall surface of the stator 109. When current begins to flow through the stator 109, the rotor 129 is rotated and rotates the drive shaft 12.

[0039] As shown in FIG. 2, a plurality of fluid flow paths 5g (5g1, 5g2, 5g3, and 5g4) are formed in the outer periphery of the motor 139, penetrating the motor in the vertical direction. The plurality of fluid flow paths 5g are formed at intervals in the circumferential direction when viewed in the vertical direction. The fluid flow paths 5g are formed by notches formed in the outer periphery of the stator 109. The fluid flow paths 5g serve to drop the lubricating oil contained in the fluid discharged from the compression chamber 53 to the bottom of the sealed container 102. The fluid flow paths 5g also serve as cooling holes that cool the stator 109 by passing the fluid drawn into the first space 100a from the suction pipe 103 downward through the fluid guide portion 30 (described later). The fluid flow paths 5g also serve to pass the fluid that has finished cooling the stator 109 upward.

[0040] The arrows in Fig. 1 indicate the flow of fluid that has flowed into the sealed container 102 from the suction pipe 103, and at least fluid flow path 5g1 of the multiple fluid flow paths 5g is a downward flow path through which the fluid guided by the fluid guiding portion 30 passes downward. At least fluid flow path 5g3 of the multiple fluid flow paths 5g is an upward flow path through which the fluid passes upward. The fluid flow directions of fluid flow paths 5g2 and 5g4 are not fixed, and become upward or downward flow paths depending on the operating state of the scroll compressor 100. The flow of fluid in the fluid flow paths 5g will be described later.

[0041] (Oldham coupling 20) The Oldham coupling 20 is disposed on the thrust surface 11d of the orbiting scroll 11 and functions to prevent rotational motion of the orbiting scroll 11 during its orbital motion. The thrust surface 11d is the lower surface of the orbiting base plate 11a, which is in contact with the upper surface of the thrust plate 16. The Oldham coupling 20 functions to prevent rotational motion of the orbiting scroll 11 and to enable orbital motion.

[0042] (Balancer cover 21) The balancer cover 21 is disposed so as to cover the rotational locus of the first balancer 13 from above, and prevents the lubricating oil from being drawn into the compression chamber 53 when it collides with the rotating first balancer 13 and splashes. The balancer cover 21 is formed from resin and has a cylindrical shape with a bottom that is open at the bottom. A cylindrical metal spacer 22 is fitted into the bottom of the balancer cover 21. The balancer cover 21 is attached to the underside of the frame 15 by inserting bolts 23 into the spacer 22 and fixing the spacer 22 to the underside of the frame 15 with the inserted bolts 23.

[0043] (Oil pipe 18) The oil pipe 18 guides excess lubricating oil accumulated between the frame 15 and the orbiting scroll 11 to the oil sump 131. The oil pipe 18 guides lubricating oil discharged from the oil return hole 15d of the frame 15 to the oil sump 131. The upstream end 18a of the oil pipe 18 is connected to the oil return hole 15d of the frame 15, and the downstream end 18b is located in a fluid flow path 5g formed on the outer periphery of the motor 139. In the illustrated example, the downstream end 18b of the oil pipe 18 is located midway through the fluid flow path 5g, but it may also be located below the lower end of the fluid flow path 5g, i.e., in the third space 100c.

[0044] (Compression chamber 53) The compression chamber 53 is formed by the lower surface of the fixed base plate 10a and the fixed scroll 10b, and the upper surface of the oscillating base plate 11a and the oscillating scroll 11b. The compression chamber 53 is connected to the suction chamber 54. The oscillating motion of the oscillating scroll 11 relative to the fixed scroll 10 allows the fluid that has flowed into the compression chamber 53 to be compressed as it moves toward the center of the compression chamber 53.

[0045] (Suction chamber 54) The suction chamber 54 is formed by the inner surface of the frame 15, the outer periphery of the oscillating base plate 11a, the upper surface of the thrust plate 16, the outer surface of the fixed scroll 10b, and the outer surface of the oscillating scroll 11b. The suction chamber 54 is in communication with the compression chamber 53 and the suction port 15a. That is, the suction chamber 54 is capable of supplying fluid flowing in through the suction port 15a to the compression chamber 53. The suction chamber 54 is in communication with the oil inlet chamber 55 via the first oil hole 16a of the thrust plate 16 and the first recess 11f of the oscillating scroll 11, and is also in communication with the oil inlet chamber 55 via the second oil hole 16b of the thrust plate 16 and the second recess 11g of the oscillating scroll 11. Lubricating oil from the oil inlet chamber 55 flows into the suction chamber 54 via the first oil hole 16a and the second oil hole 16b, and is supplied to various sliding parts to lubricate the sliding parts. The flow rate Q of the lubricating oil supplied to the suction chamber is determined by the differential pressure between the oil pressure in the oil inlet chamber 55 and the pressure P2 in the suction chamber .

[0046] (Oil inflow chamber 55) The oil inlet chamber 55 is formed by the outer surface of the boss portion 11j and the lower part of the frame 15. The oil inlet chamber 55 is connected to the oil supply hole 12b of the drive shaft 12. That is, the lubricating oil flowing out from the oil supply hole 12b flows into the oil inlet chamber 55. The oil inlet chamber 55 is connected to the suction chamber 54 via the first recess 11f and the first oil hole 16a, and also to the suction chamber 54 via the second recess 11g and the second oil hole 16b. Therefore, the lubricating oil that flows into the oil inlet chamber 55 is supplied to the suction chamber 54. The lubricating oil that flows into the oil inlet chamber 55 is also supplied between the thrust surface 11d of the orbiting scroll 11 and the thrust plate 16, which is a component of the frame 15, via the first recess 11f and the second recess 11g.

[0047] (Fluid guide section 30) The fluid guide portion 30 forcibly guides downward the flow of the fluid that flows out from the outlet 103a and is sucked into the sealed container 102. The fluid guide portion 30 is provided for the purpose of cooling the stator 109 by guiding downward the fluid that flows out from the outlet 103a and is sucked into the sealed container 102 and passing it through a fluid flow path 5g formed on the outer periphery of the stator 109. The fluid guide portion 30 is formed separately from the frame 15 and is fixed to the lower surface portion 15f of the frame 15.

[0048] FIG. 3 is a perspective view of the fluid guide portion 30, the oil pipe 18, the frame 15, and the suction pipe 103 of the scroll compressor 100 according to the first embodiment. The sealed container 102 is not shown in FIG. 3. FIG. 4 is a perspective view of FIG. 3 as viewed from below. FIG. 5 is a side view of FIG. 3. FIG. 6 is a bottom view of FIG. 3. FIG. 7 is a perspective view of FIG. 3 without the suction pipe 103. FIG. 8 is a perspective view of FIG. 7 as viewed from below. FIG. 9 is a perspective view of the fluid guide portion 30 of the scroll compressor 100 according to the first embodiment. FIG. 10 is a perspective view showing a state in which the oil pipe 18 is fixed to the fluid guide portion 30 of FIG. 9. FIG. 11 is a perspective view of FIG. 10 as viewed from above.

[0049] 9 to 11, the fluid guide portion 30 has a main portion 31, an upper surface portion 32, and a pair of side surface portions 33. The fluid guide portion 30 is configured from a member in which the main portion 31, the upper surface portion 32, and the pair of side surface portions 33 are integrated together. The member that configures the fluid guide portion 30 may be formed by bending a metal sheet, for example, or may be configured from resin.

[0050] The main portion 31 is formed, for example, in a rectangular shape. The main portion 31 is the portion that comes into contact with the fluid that flows out from the outlet 103a of the suction pipe 103. The width W of the main portion 31 is configured to be larger than the diameter of the outlet 103a of the suction pipe 103. The main portion 31 is formed with a pipe hole 31a through which the oil pipe 18 passes. The pipe hole 31a penetrates the main portion 31 in the thickness direction. The pipe hole 31a is formed in the upper corner.

[0051] The top surface portion 32 is formed to extend perpendicularly from the upper end of the main portion 31 to the main portion 31. The top surface portion 32 is a portion that prevents fluid that comes into contact with the main portion 31 from flowing upward. The top surface portion 32 is formed with fixing holes 32a for fixing the fluid guide portion 30 to the frame 15. The pair of side surface portions 33 are formed to extend perpendicularly to the main portion 31 in the same direction as the top surface portion 32 from both left and right ends of the main portion 31. The pair of side surface portions 33 are portions that prevent fluid that comes into contact with the main portion 31 from flowing in the left and right directions of the main portion 31. The fluid guide portion 30 guides airflow that has flowed into a space surrounded by the main portion 31, the top surface portion 32, and the pair of side surface portions 33 downward.

[0052] As shown in Figures 10 and 11, the oil pipe 18 is fixed and integrated with the fluid guide portion 30 having the above configuration. The oil pipe 18 is passed through a pipe hole 31a of the fluid guide portion 30 and connected to one of a pair of side surfaces 33 of the fluid guide portion 30 by welding, thereby being integrated with the fluid guide portion 30. As shown in Figure 11, the oil pipe 18 is passed obliquely through the pipe hole 31a of the fluid guide portion 30 and is integrated with the fluid guide portion 30 while extending straight within the fluid guide portion 30. Note that the integration of the fluid guide portion 30 and the oil pipe 18 is not limited to welding. The fluid guide portion 30 may have clamping portions that clamp the oil pipe 18, and the fluid guide portion 30 and the oil pipe 18 may be integrated with each other by clamping the oil pipe 18 at the clamping portions. The clamping portion is composed of, for example, a pair of walls that rise vertically from one of the pair of side surface portions 33 of the fluid guide portion 30 to the other side surface portion 33, extend in the up-and-down direction, and are spaced apart from each other by a distance smaller than the outer diameter of the oil pipe 18. In this configuration, the oil pipe 18 is clamped between the pair of walls, thereby integrating the fluid guide portion 30 and the oil pipe 18.

[0053] The fluid flowing out from the outlet 103a of the suction pipe 103 collides with the oil pipe 18. For this reason, if the oil pipe 18 is not fixed to the fluid guide part 40 and is movable relative to the fluid guide part 40, the vibration caused by the collision of the fluid may cause the oil pipe 18 to come into contact with the fluid guide part 30, which may result in noise or breakage. Therefore, it is desirable that the oil pipe 18 and the fluid guide part 30 be integrated.

[0054] 3 to 6, the fluid guide portion 30 is fixed to the frame 15 in an orientation in which the main portion 31 faces the outlet 103a of the suction pipe 103, and the top surface portion 32 and the pair of side surface portions 33 extend toward the outlet 103a. The fluid guide portion 30 is fixed by inserting the upstream end 18a of the oil pipe 18 integrated with the fluid guide portion 30 into the oil return hole 15d. The fluid guide portion 30 is fixed to the frame 15 by inserting a fixing member 34 such as a bolt into a fixing hole 32a and fitting it into a hole (not shown) provided in the frame 15.

[0055] When assembling the scroll compressor 100, the upstream end 18a of the oil pipe 18, which is an integrated component of the fluid guide section 30 and the oil pipe 18, is inserted into and fixed to the oil return hole 15d of the frame 15. In this way, the fluid guide section 30 is not attached separately from the oil pipe 18, but is attached to the frame 15 together with the oil pipe 18.

[0056] When the fluid guide unit 30 is fixed to the frame 15, the main portion 31 faces the outlet 103a and extends in a direction perpendicular to the axial direction of the suction pipe 103. The axial direction of the suction pipe 103 is the axial direction of the suction pipe 103 at the connection portion of the suction pipe 103 with the sealed container 102, which is the horizontal direction in the illustrated example. The fluid flowing out horizontally from the outlet 103a of the suction pipe 103 is forcibly changed in flow direction downward by the fluid guide unit 30, and becomes a flow toward the motor 139.

[0057] As described above, the width W of the main portion 31 is desirably larger than the diameter of the outlet 103a of the suction pipe 103. The diameter of the outlet 103a of the suction pipe 103 is desirably smaller than the width W of the main portion 31. The main portion 31 and the outlet 103a of the suction pipe 103 are desirably sized and positioned so that when the outlet 103a of the suction pipe 103 is projected onto the fluid guiding portion 30, the entire outlet 103a is contained within the main portion 31. This allows the fluid guiding portion 30 to guide most of the fluid from the suction pipe 103 directly downward.

[0058] [Explanation of the operation of the scroll compressor 100] The scroll compressor 100 configured as described above operates as follows. The rotor 129 rotates due to the rotational force generated by the rotating magnetic field generated by the stator 109. This rotation drives the drive shaft 12 fixed to the rotor 129. The rotation of the drive shaft 12 is converted into a swinging motion of the swinging scroll 11 by the Oldham coupling 20. This rotation of the drive shaft 12 causes the fluid in the sealed container 102 to flow into the compression chamber 53 formed by the fixed scroll 10b and the swinging scroll 11b, starting the suction process.

[0059] When the fluid is sucked into the compression chamber 53, it is compressed in the compression chamber 53 by the swinging motion of the swing scroll 11. Then, the fluid compressed in the compression chamber 53 moves to the discharge process. That is, the fluid is discharged from the scroll compressor 100 through the discharge port 10c of the fixed scroll 10 and the discharge pipe 104. Specifically, when the scroll compressor 100 operates, the flow of the fluid and lubricating oil in the scroll compressor 100 is as follows.

[0060] [Flow of fluids and lubricants] (fluid) Fluid that flows into the sealed container 102 from the suction pipe 103 flows into the suction chamber 54 via the suction port 15a. The fluid that flows into the suction chamber 54 then flows into the compression chamber 53. The fluid that flows into the compression chamber 53 is compressed by the action of the swinging motion of the swinging scroll 11 relative to the fixed scroll 10, and gradually moves toward the centers of the fixed scroll 10b and the swinging scroll 11b. The fluid that has moved to the centers of the fixed scroll 10b and the swinging scroll 11b is then discharged from the discharge port 10c formed in the fixed base plate 10a.

[0061] (lubricating oil) The lubricating oil stored in the oil reservoir 131 rises up through the oil feed hole 12b due to the pumping action of the oil pump 91. Some of the lubricating oil that rises in the oil feed hole 12b is supplied to the bearing 11c and the main bearing 15c and adheres to the bearing 11c, the main bearing 15c, and their surrounding components, suppressing wear between the components. The rest of the lubricating oil that rises in the oil feed hole 12b flows into the oil inlet chamber 55.

[0062] A portion of the lubricating oil that has flowed into oil inlet chamber 55 flows into suction chamber 54 via first recess 11f and first oil hole 16a, and also flows into suction chamber 54 via second recess 11g and second oil hole 16b. The lubricating oil that has flowed into suction chamber 54 mixes with the fluid in suction chamber 54. The lubricating oil that has mixed with the fluid in suction chamber 54 then flows into compression chamber 53. The lubricating oil that has flowed into the compression chamber adheres to the side surfaces of fixed scroll 10b, oscillating scroll 11b, fixed base plate 10a, and oscillating base plate 11a, improving the airtightness of compression chamber 53 and suppressing wear thereon.

[0063] In addition, a portion of the lubricating oil that flows into the oil inlet chamber 55 is also supplied to the gap between the thrust plate 16, suppressing wear therebetween. The remainder of the lubricating oil that flows into the oil inlet chamber 55 is returned to the oil reservoir 131 via the oil return hole 15d and the oil pipe 18. The remainder of the lubricating oil that flows into the oil inlet chamber 55 is the excess lubricating oil that is supplied between the orbiting scroll 11 and the frame 15.

[0064] The remainder of the lubricating oil that has flowed into the oil inlet chamber 55 is discharged below the frame 15 through the main bearing 15c. The lubricating oil that has been discharged below the frame 15 via this route collides with the first balancer 13 located below the main bearing 15c and is splashed. The splashed lubricating oil is captured by the inner surface of the balancer cover 21 and guided downward along the inner surface of the balancer cover 21 by its own weight. By guiding the splashed lubricating oil downward by the balancer cover 21, it is possible to prevent the splashed lubricating oil from being sucked into the compression chamber 53 and being discharged outside the sealed container 102, and it is possible to prevent a shortage of lubricating oil in the sealed container 102.

[0065] (Function of fluid guide portion 30) As shown in FIG. 1, the fluid that flows into the sealed container 102 from the suction pipe 103 is forcibly changed into a downward flow by the fluid guide unit 30. The fluid that has been forcibly changed into a downward flow by the fluid guide unit 30 flows downward through fluid flow path 5g1 among the multiple fluid flow paths 5g, and then flows upward through at least fluid flow path 5g3 to enter the first space 100a. Hereinafter, fluid flow path 5g1 will be referred to as the downward flow path 5g1, and fluid flow path 5g3 will be referred to as the upward flow path 5g3. The upward flow path 5g3 is a fluid flow path among the multiple fluid flow paths 5g that is located on the opposite side of the suction pipe 103 and the drive shaft 12 when viewed in the axial direction.

[0066] Fig. 12 is a diagram showing the flow of fluid in a scroll compressor 1000 of a comparative example. In Fig. 12, solid arrows indicate the flow of fluid, and dotted arrows indicate the flow of refrigeration oil. Scroll compressor 1000 of the comparative example is configured such that oil pipe 180 is arranged on the opposite side of drive shaft 12 (hereinafter referred to as the anti-suction pipe side) from the connection part of suction pipe 103 to sealed container 102 when viewed in the axial direction.

[0067] In the scroll compressor 1000 of the comparative example, the oil pipe 180 is disposed on the side opposite the suction pipe, and the downstream end 18b of the oil pipe 18 is located in the upward flow path 5g3. Therefore, in the scroll compressor 1000 of the comparative example, the lubricating oil flowing out from the downstream end 18b of the oil pipe 180 flows into the upward flow path 5g3. Because the fluid flows upward in the upward flow path 5g3, the lubricating oil that flows into the upward flow path 5g3 is carried up by the fluid flowing upward through the upward flow path 5g3 and flows into the first space 100a. There, the lubricating oil mixes with the fluid and is drawn into the compression chamber 53 through the suction port 15a. In this case, the lubricating oil drawn into the compression chamber 53 is discharged together with the fluid from the discharge pipe to the outside of the compressor.

[0068] In contrast, in the scroll compressor 100, the oil pipe 18 extends downward and is inserted into the downward flow path 5g1 in which the fluid flow is directed downward by the fluid guide portion 30, and the downstream end 18b of the oil pipe 18 is located in the fluid flow path 5g1. Therefore, in the scroll compressor 100, the lubricating oil flowing out from the downstream end 18b of the oil pipe 18 can be entrained in the downward fluid flow in the downward flow path 5g1 and directed downward, thereby preventing the lubricating oil from being discharged outside the compressor. In other words, the scroll compressor 100 can prevent the amount of lubricating oil flowing out from the oil pipe 18 from being entrained.

[0069] The scroll compressor 100 can reduce the amount of lubricating oil discharged outside the compressor (hereinafter referred to as the oil rise amount) by suppressing the amount of lubricating oil that flows out of the oil pipe 18 being lifted up. Because the scroll compressor 100 can reduce the oil rise amount, it can suppress the reduction in refrigeration capacity and performance that would otherwise be caused by an increase in the oil rise amount, and can improve the refrigeration capacity.

[0070] [Effects of the scroll compressor 100 according to the first embodiment] The scroll compressor 100 of the first embodiment includes a sealed container 102 having an oil reservoir 131 formed at the bottom for storing lubricating oil, a fixed scroll 10 disposed in an upper portion of the sealed container 102, and an orbiting scroll 11 disposed below the fixed scroll 10 and forming a compression chamber 53 together with the fixed scroll 10. The scroll compressor 100 also includes a frame 15 disposed below the orbiting scroll 11 and supporting the orbiting scroll 11 so that the orbiting scroll 11 can slide freely, a motor 139 disposed below the frame 15, and a drive shaft 12 connecting the motor 139 and the orbiting scroll 11 and transmitting the driving force of the motor 139 to the orbiting scroll 11. The scroll compressor 100 also includes an oil pump 91 disposed on the drive shaft 12 and supplying lubricating oil from the oil reservoir 131 between the orbiting scroll 11 and the frame 15 through an oil supply hole 12b formed in the drive shaft 12. The scroll compressor 100 is connected to the sealed container 102 so that the outlet 103a opens in the space between the frame 15 and the motor 139. The scroll compressor 100 includes a suction pipe 103 that guides fluid from the outlet 103a into the sealed container 102. The frame 15 is formed with an oil return hole 15d that discharges excess lubricating oil supplied between the orbiting scroll 11 and the frame 15 by the oil pump 91 downward from the frame 15. The scroll compressor 100 includes an oil pipe 18 whose upstream end 18a is connected to the oil return hole 15d and that guides the lubricating oil discharged from the oil return hole 15d downward. The scroll compressor 100 includes a fluid guide unit 30 that is disposed opposite the outlet 103a of the suction pipe 103 and guides downward the fluid that flows out of the outlet 103a and is drawn into the sealed container 102. A plurality of fluid flow paths 5g that penetrate vertically are formed around the outer periphery of the motor 139. At least one of the multiple fluid flow paths 5g is a downward flow path through which the fluid guided by the fluid guide portion 30 passes downward, and the downstream end 18b of the oil pipe 18 is located in the downward flow path.

[0071] With the above configuration, the scroll compressor 100 can direct the lubricating oil flowing out from the downstream end 18b of the oil pipe 18 downward by entraining it in the downward fluid flow in the downward flow path 5g1, thereby preventing the lubricating oil from being discharged outside the compressor. In other words, the scroll compressor 100 can prevent the amount of lubricating oil flowing out from the oil pipe 18 from being entrained.

[0072] The fluid guide portion 30 has a main portion 31 facing the outlet 103a of the suction pipe 103, an upper surface portion 32 extending from the upper end of the main portion 31 toward the outlet 103a, and a pair of side portions 33 extending from both left and right ends of the main portion 31 toward the outlet 103a.

[0073] With the above-described configuration, scroll compressor 100 can guide the fluid that flows out of outlet 103a of suction pipe 103 and into sealed container 102 downward.

[0074] The fluid guide portion 30 is formed separately from the frame 15 and fixed to the frame 15 .

[0075] With the above-described configuration, the scroll compressor 100 can configure the fluid guide portion 30 using an independent member, which makes it easier to manufacture the fluid guide portion 30 compared to a configuration in which the fluid guide portion 30 is formed integrally with the frame 15.

[0076] The fluid guide portion 30 and the oil pipe 18 are integrated together.

[0077] With the above configuration, the scroll compressor 100 can be manufactured by fixing the fluid guide portion 30 and the oil pipe 18 together to the frame 15, which simplifies the manufacturing process compared to when the fluid guide portion 30 and the oil pipe 18 are fixed separately to the frame 15.

[0078] Although the first embodiment does not specifically mention the position of the lower end of the side surface portion 21b of the balancer cover 21, for example, the position of the lower end of the side surface portion 21b of the balancer cover 21 may be located below the upper coil end 109a (the upper end of the winding inserted in the stator) of the stator 109 of the motor 139. By configuring the balancer cover 21 in this manner, when lubricating oil that collides with the first balancer 13 and is splashed attempts to be drawn into the compression chamber 53 through between the balancer cover 21 and the motor 139, the splashed lubricating oil collides with the upper coil end 109a of the stator 109 and is captured. This further prevents the splashed lubricating oil from being drawn into the compression chamber 53 and then discharged outside the sealed container 102, thereby preventing a shortage of lubricating oil in the sealed container 102.

[0079] Embodiment 2 In the second embodiment, the configuration of the fluid guide section 30 is different from that of the first embodiment. The other configurations are the same as or equivalent to those of the first embodiment. The following description will focus on the configurations in the second embodiment that are different from those of the first embodiment, and the configurations not described in the second embodiment are the same as those of the first embodiment.

[0080] Fig. 13 is a vertical cross-sectional view of a scroll compressor according to embodiment 2. Fig. 14 is a perspective view of the fluid guide portion 30, the oil pipe 18, the frame 15, and the suction pipe 103 shown in Fig. 13, viewed from below. Fig. 15 is a cross-sectional view of the oil pipe 18 portion shown in Fig. 14.

[0081] In the scroll compressor 100 of the second embodiment, the fluid guide portion 30 is formed by a part of the frame 15. The fluid guide portion 30 is formed by ribs 15e extending downward from the lower surface portion 15f of the frame 15. The configuration of the fluid guide portion 30 is the same as that of the first embodiment. That is, the fluid guide portion 30 has a main portion 31 facing the outlet 103a of the suction pipe 103, an upper surface portion 32 extending perpendicularly from the upper end of the main portion 31 to the main portion 31, and a pair of side surfaces 33 extending perpendicularly from both left and right ends of the main portion 31 to the main portion 31. The upper surface portion 32 is formed by the lower surface portion 15f of the frame 15. In other words, a part of the lower surface portion 15f of the frame 15 also serves as the upper surface portion 32 of the fluid guide portion 30. The function of the fluid guide portion 30 is the same as that of the fluid guide portion 30 of the first embodiment.

[0082] [Effects of the scroll compressor 100 according to the second embodiment] As described above, in the scroll compressor 100 of the second embodiment, the fluid guide portion 30 is formed by the rib 15e of the frame 15, and the same effects as those of the first embodiment can be obtained.

[0083] Embodiment 3 The third embodiment relates to the position of the intake port 15a of the frame 15. The following description will focus on the configuration of the third embodiment that differs from the first and second embodiments, and the configuration not described in the third embodiment is the same as the first and second embodiments.

[0084] Fig. 16 is a view from below of a frame 150 of a scroll compressor of a comparative example. Fig. 17 is a view from below of a frame 15 of a scroll compressor 100 according to embodiment 3. In Figs. 16 and 17, the position of a fluid flow path 5g below the frame 15 when viewed in the axial direction is indicated by a dotted line.

[0085] 16, the frame 150 of the comparative example has a main suction port 150a and a sub-suction port 150a1 with a smaller opening than the suction port 150a, and the main suction port 150a is formed in the following position: The suction port 150a is formed in a position where the angular range α of the suction port 150a, centered on the axis O of the drive shaft 12 as viewed in the axial direction, partially overlaps with the angular range β of the upward flow path 5g3. Therefore, the fluid containing lubricating oil that has flowed out from the upward flow path 5g3 is easily drawn into the suction port 150a, which may increase the amount of oil rising.

[0086] 17, scroll compressor 100 of the third embodiment has main suction port 15a and sub-suction port 15a1 having a smaller opening than suction port 15a, and main suction port 15a is formed at the following position: Main suction port 15a is formed at a position where, as viewed in the axial direction, an angular range α of suction port 15a, centered on axis O of drive shaft 12, does not overlap with an angular range β of upward flow path 5g3. Therefore, in scroll compressor 100 of the third embodiment, the fluid containing lubricating oil that passes upward through upward flow path 5g3 and flows into first space 100a is less likely to be drawn into suction port 150a than in the comparative example, and the amount of oil leakage can be reduced.

[0087] The illustrated example assumes a case in which the fluid flow direction in the fluid flow paths 5g2, 5g3, and 5g4 is all upward, and the flow rate of the fluid in the fluid flow path 5g3 is greater than the flow rate of the fluid in each of the fluid flow paths 5g2 and 5g4. The flow rate of the fluid in the fluid flow paths 5g varies depending on the operating state of the scroll compressor 100, but the fluid flow path 5g that tends to have the largest flow rate of the upward fluid can be identified at the time of design. Specifically, which of the fluid flow paths 5g tends to have the largest flow rate can be identified, for example, by the shape of the lower portion of the sealed container 102 that has the oil reservoir 131 or the shape of the subframe 110. Therefore, the suction port 15a is not limited to the fluid flow path 5g3 on the opposite side of the suction pipe among the multiple fluid flow paths 5g, as long as it is formed at a position that does not overlap, as viewed in the axial direction, with the angular range of the fluid flow path 5g that tends to have the largest flow rate of the upward fluid.

[0088] [Effects of the scroll compressor 100 according to the third embodiment] As described above, the scroll compressor 100 of the third embodiment has the same advantageous effects as those of the first and second embodiments, and also has the following advantageous effect: The scroll compressor 100 of the third embodiment can reduce the amount of oil rising because the angle range α of the suction port 150a, centered on the axis O as viewed in the axial direction, does not overlap with the angle range β of the upward flow path 5g3.

[0089] Various aspects of the present disclosure are summarized below as appendices. (Appendix 1) a sealed container having an oil reservoir formed at the bottom for storing lubricating oil; a fixed scroll disposed in an upper portion of the sealed container; an orbiting scroll disposed below the fixed scroll and forming a compression chamber together with the fixed scroll; a frame disposed below the orbiting scroll and slidably supporting the orbiting scroll; a motor provided below the frame; a drive shaft that connects the motor and the orbiting scroll and transmits the driving force of the motor to the orbiting scroll; an oil pump provided on the drive shaft for supplying the lubricating oil in the oil reservoir to a space between the orbiting scroll and the frame through an oil supply hole formed in the drive shaft; a suction pipe connected to the sealed container such that an outlet thereof opens in a space between the frame and the motor, and which guides fluid from the outlet into the sealed container; Equipped with A scroll compressor in which an oil return hole is formed in the frame to discharge excess lubricating oil supplied between the orbiting scroll and the frame by the oil pump below the frame, an oil pipe whose upstream end is connected to the oil return hole and which guides the lubricating oil discharged from the oil return hole downward; a fluid guide portion that is disposed opposite the outlet of the suction pipe and that guides downward the fluid that flows out of the outlet and is sucked into the sealed container, A plurality of fluid flow paths are formed in the outer periphery of the motor, penetrating in the vertical direction, at least one fluid flow path among the plurality of fluid flow paths is a downward flow path through which the fluid guided by the fluid guide portion passes downward, A scroll compressor, wherein the downstream end of the oil pipe is located in the downward flow path. (Appendix 2) 2. The scroll compressor according to claim 1, wherein the fluid guide portion has a main portion facing the outlet of the suction pipe, an upper surface portion extending from an upper end of the main portion toward the outlet, and a pair of side surfaces extending from both left and right ends of the main portion toward the outlet. (Appendix 3) 3. The scroll compressor according to claim 2, wherein the fluid guide portion is formed separately from the frame and fixed to a lower surface of the frame. (Appendix 4) 4. The scroll compressor according to claim 1, wherein the fluid guide portion and the oil pipe are integrated together. (Appendix 5) 3. The scroll compressor according to claim 2, wherein the fluid guide portion is formed by a rib protruding downward from a lower surface portion of the frame. (Appendix 6) the plurality of fluid flow paths are formed at intervals in a circumferential direction on an outer periphery of the motor, At least one of the plurality of fluid flow paths other than the downward flow path is an upward flow path through which the fluid passes upward, a suction port formed in the frame for guiding the fluid in the sealed container to the compression chamber; 6. The scroll compressor according to claim 1, wherein the suction port is formed at a position where an angular range of the suction port centered on an axis of the drive shaft does not overlap with an angular range of the upward flow path when viewed in the axial direction of the drive shaft. (Appendix 7) 7. The scroll compressor according to claim 6, wherein the upward flow path is one of the plurality of fluid flow paths that is located on the opposite side of the suction pipe and the drive shaft as viewed in the axial direction. [Explanation of symbols]

[0090] 5g fluid flow path, 5g1 fluid flow path (downward flow path), 5g2 fluid flow path, 5g3 fluid flow path (upward flow path), 5g4 fluid flow path, 10 fixed scroll, 10a fixed base plate, 10b fixed volute, 10c discharge port, 11 orbiting scroll, 11a volute base plate, 11b volute, 11c bearing, 11d thrust surface, 11f first recess, 11g second recess, 11j boss portion, 12 drive shaft, 12a eccentric portion, 12b oil supply hole, 13 first balancer, 14 second balancer, 15 frame, 15a suction port, 15a1 suction port, 15b thrust support surface, 15c main bearing, 15d oil return hole, 15e rib, 15f lower surface portion, 16 thrust plate, 16a First oil hole, 16b Second oil hole, 18 Oil pipe, 18a Upstream end, 18b Downstream end, 20 Oldham coupling, 21 Balancer cover, 21b Side portion, 22 Spacer, 23 Bolt, 30 Fluid guide portion, 31 Main portion, 31a Pipe hole, 32 Upper surface portion, 32a Fixing hole, 33 Side portion, 34 Fixing member, 53 Compression chamber, 54 Suction chamber, 55 Oil inlet chamber, 90 Bearing, 91 Oil pump, 100 Scroll compressor, 100a First space, 100b Second space, 100c Third space, 102 Sealed container, 103 Suction pipe, 103a Outlet, 104 Discharge pipe, 109 Stator, 109a Upper coil end, 110 Subframe, 129 Rotor, 131 Oil sump, 139 Motor, 150 frame, 150a suction port, 150a1 suction port, 180 oil pipe, 1000 scroll compressor, O shaft center, P2 pressure, Q flow rate, α angle range, β angle range.

Claims

1. a sealed container having an oil reservoir formed at the bottom for storing lubricating oil; a fixed scroll disposed in an upper portion of the sealed container; an orbiting scroll disposed below the fixed scroll and forming a compression chamber together with the fixed scroll; a frame disposed below the orbiting scroll and slidably supporting the orbiting scroll; a motor provided below the frame; a drive shaft that connects the motor and the orbiting scroll and transmits the driving force of the motor to the orbiting scroll; an oil pump provided on the drive shaft for supplying the lubricating oil in the oil reservoir to a space between the orbiting scroll and the frame through an oil supply hole formed in the drive shaft; a suction pipe connected to the sealed container such that an outlet thereof opens in a space between the frame and the motor, and which guides fluid from the outlet into the sealed container; Equipped with A scroll compressor in which an oil return hole is formed in the frame to discharge excess lubricating oil supplied between the orbiting scroll and the frame by the oil pump below the frame, an oil pipe whose upstream end is connected to the oil return hole and which guides the lubricating oil discharged from the oil return hole downward; a fluid guide portion that is disposed opposite the outlet of the suction pipe and that guides downward the fluid that flows out of the outlet and is sucked into the sealed container, A plurality of fluid flow paths are formed in the outer periphery of the motor, penetrating in the vertical direction, at least one fluid flow path among the plurality of fluid flow paths is a downward flow path through which the fluid guided by the fluid guide portion passes downward, A scroll compressor, wherein the downstream end of the oil pipe is located in the downward flow path.

2. 2. The scroll compressor according to claim 1, wherein the fluid guide portion has a main portion facing the outlet of the suction pipe, an upper surface portion extending from an upper end of the main portion toward the outlet, and a pair of side surfaces extending from both left and right ends of the main portion toward the outlet.

3. 3. The scroll compressor according to claim 2, wherein the fluid guide portion is formed separately from the frame and fixed to the lower surface of the frame.

4. 4. The scroll compressor according to claim 1, wherein the fluid guide portion and the oil pipe are integrated together.

5. 3. The scroll compressor according to claim 2, wherein the fluid guide portion is formed by a rib protruding downward from the lower surface of the frame.

6. the plurality of fluid flow paths are formed at intervals in a circumferential direction on an outer periphery of the motor, At least one of the plurality of fluid flow paths other than the downward flow path is an upward flow path through which the fluid passes upward, a suction port formed in the frame for guiding the fluid in the sealed container to the compression chamber; The scroll compressor according to any one of claims 1 to 3, wherein the suction port is formed at a position where an angular range of the suction port centered on the axis of the drive shaft does not overlap with an angular range of the upward flow path when viewed in the axial direction of the drive shaft.

7. 7. The scroll compressor according to claim 6, wherein the upward flow passage is one of the plurality of fluid passages that is located on the opposite side of the suction pipe and the drive shaft as viewed in the axial direction.

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