JP2008082272A - Fluid compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fluid compressor capable of improving oil separating performance and exhibiting excellent reliability with an inexpensive structure while securing a sufficient balance weight function. <P>SOLUTION: In the fluid compressor 1, a delivery pipe 701 is positioned on the opposite side of a guide 423 for changing the direction of working gas from a frame outer peripheral passage 421 to a peripheral direction, the delivery pipe 701 is positioned in the upper part than the balance weight 407, the whole of a lower surface of a compression mechanism support part 401b of a frame 400 is positioned in the upper part than the delivery pipe 701, and a plurality of recessed step parts 401c extending along an outer periphery are formed on an outer peripheral lower corner part of the compression mechanism support part 401b, tuck welding 740 is performed in a position in corresponding to a thick part 401d remaining between a plurality of the recessed step parts 401c, and the whole of the lower surface of the compression mechanism support part 401b of the frame 400 is positioned in the upper part than the delivery pipe 701. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fluid compressor, and is particularly suitable for a scroll compressor for refrigeration and air conditioning.

  As a fluid compressor of prior art 1, there is one shown in JP-A-8-261177 (Patent Document 1). This scroll compressor is arranged at the upper part in the sealed container and compresses the working fluid and discharges it upward, and the electric motor is arranged at the lower part in the sealed container and drives the compression mechanism part via the rotating shaft. A frame having a bearing support portion for supporting the bearing and a compression mechanism support portion leg for supporting the compression mechanism portion, a balance weight having an outer peripheral surface located above the stator end coil and facing the sealed container, A frame outer peripheral passage provided on the outer peripheral surface of the compression mechanism support portion, a guide for guiding the working fluid from the frame outer peripheral passage downward, and the outer side of the balance weight outer peripheral surface facing the outer side of the working fluid to the outside of the sealed container And a discharge pipe for discharging.

  Moreover, as a fluid compressor of the prior art 2, there is one disclosed in Japanese Patent Laid-Open No. 2005-163637 (Patent Document 2). This scroll compressor is arranged at the upper part in the sealed container and compresses the working fluid and discharges it upward, and the electric motor is arranged at the lower part in the sealed container and drives the compression mechanism part via the rotating shaft. A bearing support portion for supporting the bearing, a compression mechanism support portion for supporting the compression mechanism portion, a frame having legs, a balance weight having an outer peripheral surface positioned above the stator end coil, and a periphery of the balance weight A cover, a frame outer peripheral passage provided on the outer peripheral surface of the compression mechanism supporting portion and the leg of the frame, a guide for changing the working fluid from the frame outer peripheral passage in the circumferential direction, and an outer peripheral surface of the balance weight on the opposite side of the guide And a discharge pipe for discharging the working fluid to the outside of the sealed container.

  Further, as a conventional fluid compressor, there is one disclosed in Japanese Patent Application Laid-Open No. 2005-113750 (Patent Document 3). The scroll fluid machine includes a compression mechanism portion that is disposed in an upper portion of the sealed container and compresses the working fluid and discharges the fluid upward, and an electric motor that is disposed in the lower portion of the sealed container and drives the compression mechanism portion via a rotating shaft. A bearing support part for supporting the bearing, a compression mechanism support part for supporting the compression mechanism part and a leg part, and a frame welded to the hermetic container via the leg part, and a balance positioned inside the stator end coil A weight, a cover covering the balance weight, a passage through which the working fluid flows from the discharge space to the lower space of the frame, and positioned above the balance weight and on the side of the leg in the circumferential direction. And a discharge pipe for discharging.

JP-A-8-261177 JP 2005-163637 A JP 2005-113750 A

  In the fluid compressor of Patent Document 1, since the discharge pipe is provided to face the outer periphery of the balance weight, the oil scattered from the balance weight and its nearby parts due to the rotation and the stirring action of the balance weight. Is likely to flow into the discharge pipe, and the working fluid discharged from the discharge pipe contains a large amount of oil, which may increase the oil upflow and reduce the reliability of the compressor.

  In the fluid compressor of Patent Document 2, a balance weight cover is provided to prevent oil from being scattered by the balance weight, but this has caused an increase in cost due to the balance weight cover. Then, the oil is centrifuged along the inner periphery of the sealed container by a guide that changes the direction of the working fluid in the circumferential direction, but when the working fluid flows toward the discharge pipe along the inner peripheral surface of the sealed container. The oil collides with the legs of the frame and is scattered, so that a large amount of oil is contained in the working fluid discharged from the discharge pipe, and there is a possibility that the oil rise increases and the reliability of the compressor is lowered.

  Furthermore, in the fluid compressor of Patent Document 3, since the balance weight is positioned inside the stator end coil, the balance weight has a small diameter, and a sufficient balance weight function may not be obtained.

  An object of the present invention is to obtain a fluid compressor that has an inexpensive structure, an improved oil separation performance, and an excellent reliability while ensuring a sufficient balance weight function.

  In order to achieve the above-described object, the present invention provides a cylindrical sealed container, a compression mechanism that is disposed in an upper part of the sealed container and compresses a working fluid and discharges it upward, and a lower part in the sealed container. An electric motor that is disposed in the motor and drives the compression mechanism through a rotation shaft, a bearing that supports the rotation shaft between the motor and the compression mechanism, a bearing support that supports the bearing, and the bearing support A compression mechanism support portion that extends outward from the upper portion of the portion and supports the compression mechanism portion, and an outer peripheral surface of the compression mechanism support portion is welded to an inner peripheral surface of the sealed container at a plurality of locations in the circumferential direction. A balance weight having an outer peripheral surface positioned above the stator end coil of the electric motor and facing the inner peripheral surface of the hermetic container; a pump portion for supplying lubricating oil to the compression mechanism portion and the bearing; The above A frame outer peripheral passage provided on the outer peripheral surface of the frame so as to pass the working fluid discharged from the contraction mechanism portion to the lower side of the frame, and the working fluid from the frame outer peripheral passage to change the direction in the circumferential direction. A guide installed on the inner peripheral surface of the sealed container, and a discharge pipe for discharging the working fluid in the space between the frame and the electric motor located on the opposite side of the guide to the outside of the sealed container, The discharge pipe is disposed above the balance weight, and the entire lower surface of the compression mechanism support portion is positioned above the discharge pipe, and a plurality of recesses extending along the outer periphery at a lower outer corner of the compression mechanism support portion. The step portion is formed and welded at a position corresponding to the thick portion left between the plurality of concave step portions.

A more preferable specific configuration example of the present invention is as follows.
(1) The plurality of concave steps are provided equally in the circumferential direction so that the thick portions left between the plurality of concave steps are positioned equally in the circumferential direction.
(2) A plurality of the frame outer peripheral passages are formed in parallel, and a support bolt for supporting the compression mechanism portion on the frame is fastened at a circumferential position between the plurality of frame outer peripheral passages, and communicated with the plurality of frame outer peripheral passages. The guide was installed so that
(3) A plurality of the frame outer peripheral passages are formed in parallel in a range of one concave step portion of the plurality of concave step portions, and the plurality of frame outer peripheral passages and the concave step portions in which these are located. The guide has been installed so as to communicate with.
(4) A discharge window in the circumferential direction of the guide is formed between the outer peripheral surface of the end coil of the stator and the inner peripheral surface of the sealed container, and the inlet of the discharge pipe is connected to a circle of the guide. Arranged inward from the discharge window in the circumferential direction.
(5) The discharge window in the circumferential direction of the guide is formed only in the same direction as the rotation direction of the rotation shaft.

  According to the present invention, it is possible to obtain a fluid compressor with improved oil separation performance and excellent reliability with an inexpensive structure while ensuring a sufficient balance weight function.

  Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 is a longitudinal sectional view of a scroll compressor according to an embodiment of the present invention, FIG. 2 is a transverse sectional view of the scroll compressor of FIG. 1 above the stator, and FIG. 3 is above the fixed scroll of the scroll compressor of FIG. 4 is a perspective view seen from the bottom of the frame of the scroll compressor of FIG. 1, and FIG. 5 is a perspective view of the guide of the scroll compressor of FIG.

  A scroll compressor 1, which is an example of a fluid compressor, has a compression mechanism portion 2 that compresses a refrigerant gas that is a working fluid and discharges it upward, and a drive portion 3 that drives the compression mechanism portion via a rotating shaft. It is configured to be housed in a closed hermetic container 700. In the present embodiment, a vertical scroll compressor in which the compression mechanism unit 2, the drive unit 3, and the oil reservoir 730 are arranged in this order from the top, and the compression mechanism unit 2 and the drive unit 3 are connected via the rotation shaft 300. is there. The compression mechanism unit 2 includes a fixed scroll 100 and a turning scroll 200 as basic elements.

  The frame 400 is fixed to the hermetic container 700 and constitutes a member that supports the rolling bearing 401. The frame 400 includes a bearing support portion 410a that supports the rolling bearing 401, and a compression mechanism support portion 401b that extends outward from the upper portion of the bearing support portion 401a and supports the compression mechanism portion 2. The entire lower surface of the compression mechanism support portion 401b is formed flat and is positioned above the discharge pipe 701. The outer peripheral surface of the compression mechanism support portion 401b is tack-welded 740 to the inner peripheral surface of the sealed container 700 at a plurality of locations in the circumferential direction. .

  Specifically, as shown in FIG. 4, a plurality of concave step portions 401c extending along the outer periphery are formed at the lower peripheral corner portion of the compression mechanism support portion 401b, and the remaining portions between the plurality of concave step portions 401c are left. Tack welding 740 is performed at a position corresponding to the thick portion 401d.

  The fixed scroll 100 includes a base plate 101, a scroll wrap 102, a suction port 103, and a discharge port 104, and is fixed to the frame 400 with a plurality of bolts 405. The plurality of bolts 405 are equally arranged in the circumferential direction. The scroll wrap 102 is erected vertically below the base plate 101.

  The orbiting scroll 200 includes a base plate 201, a scroll wrap 202, an orbiting scroll bearing portion 203, a slide bearing 210 disposed in the orbiting scroll bearing portion 203, and a back pressure hole as basic components. The scroll wrap 202 is erected vertically above the base plate 201. The orbiting scroll bearing portion 203 is formed so as to protrude perpendicularly to the lower side (non-lap side) of the base plate 201. The orbiting scroll 200 is formed by processing each component from a casting made of cast iron, aluminum, or the like.

  The compression chamber 130 configured by meshing the fixed scroll 100 and the orbiting scroll 200 is subjected to a compression operation in which the volume thereof is reduced by the orbiting movement of the orbiting scroll 200. In this compression operation, as the orbiting scroll 200 rotates, refrigerant gas is sucked into the compression chamber 130 via the suction pipe 711 and the suction port 103, and the sucked refrigerant gas passes through the compression stroke and is fixed to the fixed scroll 100. The gas is discharged from the discharge port 104 into the sealed container 700 and further discharged from the sealed container 700 via the discharge pipe 701. Thereby, the space in the sealed container 700 is kept at the discharge pressure. A high-pressure refrigerant such as R410A that is friendly to the global environment is used as the refrigerant gas compressed by the compression mechanism section 2.

  The sealed container 700 has an upper cap 710 and a lower cap 720. The upper cap 710 and the lower cap 720 are fitted over the central cylindrical portion of the sealed container 700 so as to cover the outside, and the fitting end portions are heated and welded obliquely from below and obliquely upward by a welding torch. A leg portion 721 is attached to the bottom surface of the sealed container 700. A magnet 722 is attached to the inside of the lower cap 720 and plays a role of collecting dust in the compressor.

  A hermetic terminal 702 and a terminal cover 703 are provided on the side surface of the hermetic container 700 so that electric power can be supplied to the electric motor 600. The hermetic terminal 702 is provided through the sealed container 700 and is positioned between the end coil 601 a of the stator 601 and the frame 400.

  The discharge pipe 701 is located on the opposite side of the guide 423 and discharges the refrigerant gas in the space between the frame 400 and the electric motor 600 to the outside of the sealed container 400. The discharge pipe 701 is disposed above the balance weight 407 and sealed. A side surface of the container 700 is provided.

  The drive unit 3 that orbits the orbiting scroll 200 includes an electric motor 600 including a stator 601 and a rotor 602, a rotating shaft 300, an oil supply pump 900, and an Oldham joint 500 that is a main component of the rotation prevention mechanism of the orbiting scroll 200, The rolling bearings 401 and 803, the orbiting scroll bearing portion 203, and the sliding bearing 210 disposed in the orbiting scroll bearing portion 203 are configured.

  The rotating shaft 300 includes a main shaft portion 302, a crankpin 301, and a sub bearing support portion 303 that are integrally provided. The main shaft portion 302 and the auxiliary bearing support portion 303 are formed on the same shaft center, and constitute a main shaft portion. Further, an oil supply pump 900 is press-fitted into the lower end portion of the rotating shaft 300. The rolling bearings 401 and 803 constitute a rotating shaft support portion that rotatably engages the main shaft portion 302 and the auxiliary bearing support portion 303 of the rotating shaft 300. The orbiting scroll bearing portion 203 is provided in the orbiting scroll 200 so that the sliding bearing 210 is press-fitted into the inner diameter of the orbiting scroll bearing portion 203 so that the crank pin 301 of the rotating shaft 300 can be moved and rotated in the thrust direction that is the rotating shaft direction. It has been.

  The rolling bearing (main bearing) 401 is arranged on the upper side of the electric motor 600, and the rolling bearing (sub bearing) 803 is arranged on the lower side of the electric motor 600. Rolling bearings 401 and 803 constitute main shaft bearings that support main shaft portions on both sides of electric motor 600. A housing 802 is fixed to the lower frame 801 fixed to the hermetic container 700 via bolts 805. A rolling bearing 803 is inserted into the housing 802 from above, and a housing cover 804 is further attached from above.

  The oil supply pump 900 is a centrifugal pump attached to the lower end of the rotary shaft 300, and forcibly sucks lubricating oil stored in the oil sump 730 through the oil supply hole 901, passes through the oil passage 311, rotates the auxiliary bearing 803, and rotates. It is provided for supplying to the scroll bearing portion 203 and further to the rolling bearing portion 401. The oil supplied from the oil passage 311 is also supplied to the sliding portion between the orbiting scroll 200 and the fixed scroll 100. The oil passage 311 is provided so as to vertically penetrate the rotating shaft 300, and has a lower oiling hole concentric with the axis of the rotating shaft 300 and an upper oiling hole eccentric with respect to the axis of the rotating shaft 300. is doing. A lateral oil supply hole communicating with the lower oil supply hole is provided to supply oil to the auxiliary bearing 803.

  The Oldham joint 500 is disposed on the back surface of the base plate 201 of the orbiting scroll 200. One set of two orthogonal key portions formed on the Oldham joint 500 slides on a key groove which is a receiving portion of the Oldham joint 500 formed on the frame 400, and the other set is configured on the back side of the orbiting scroll wrap 202. Slide the keyway. 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.

  When the crank pin 301 rotates eccentrically by the rotation of the rotary shaft 300 connected to the electric motor 600, the compression mechanism unit 2 performs the orbiting motion without rotating about the fixed scroll 100 by the Oldham joint 500, and the refrigerant gas is supplied. The air is sucked into the compression chamber 130 formed by the scroll wraps 102 and 202 through the suction pipe 711 and the suction port 103. Due to the orbiting motion of the orbiting scroll 200, the compression chamber 130 is reduced in volume while moving to the center portion to compress the refrigerant gas, and the compressed refrigerant gas is discharged from the discharge port 104 to the discharge chamber. The refrigerant gas discharged into the discharge chamber is circulated around the compression mechanism unit 3 and the electric motor 600 and then discharged from the discharge pipe 701 to the outside of the compressor.

  The base plate 201 of the orbiting scroll 200 is provided with a back pressure hole (not shown) that allows the compression chamber 130 and the back pressure chamber 411 on the orbiting back surface to communicate with each other. Is maintained at an intermediate pressure (intermediate pressure). The back pressure chamber 411 configured on the back side of the orbiting scroll 200 is a space formed by being surrounded by the orbiting scroll 200, the frame 400, and the fixed scroll 100. Therefore, the frame 400 also serves as a member that forms the back pressure chamber 411.

  A seal ring 410 provided in a groove on the upper surface of the frame 400 prevents discharge gas from flowing into the back pressure chamber 411. The orbiting scroll 200 is pressed against the fixed scroll 100 by the resultant force of the intermediate pressure in the back pressure chamber 411 and the discharge pressure acting inside the seal ring 410. Here, the inner diameter of the seal ring 410 is smaller than the outer diameter of the rolling bearing 401.

  In order to be able to adopt such a configuration, the rolling bearing 401 is inserted into the frame 400 from the rotational driving means side of the frame 400, and the inserted rolling bearing 401 is fixed by the frame cover 403. A thrust bearing 402 is provided on the frame cover 403. The frame cover 403 is formed separately from the frame 400. The frame cover 403 is fixed to the frame 400 with bolts 406. By fixing the bolts in this manner, the gap between the frame cover 403 and the frame 400 can be accurately sealed, so that oil leakage from the oil supply path can be suppressed. The frame cover 403 includes a portion that is inserted inside the frame 400 and presses the rolling bearing 401, and a portion that contacts and is fixed to the end surface of the frame 400 on the side of the rotation driving means.

  The balance weight 407 is provided on the rotating shaft 300 so as to be positioned closer to the electric motor than the rolling bearing 401. In this embodiment, the balance weight 407 is formed separately from the rotary shaft 300 and is press-fitted and fixed to the rotary shaft 300. However, the balance weight 407 is provided integrally with the rotary shaft 300. May be. The maximum outer diameter portion 407a of the balance weight 407 is provided so as to protrude from the end face side of the coil end 601a of the stator 601 and has a larger diameter than the inner diameter of the coil end 601a. Thereby, a sufficient rotation balance of the rotation shaft 300 can be ensured.

  Next, the oil supply path will be described. When the rotating shaft 300 is rotated, the oil in the oil reservoir 730 is boosted and supplied to the oil passage 311 in the rotating shaft by the oil supply pump 900. Part of the oil sent to the oil passage 311 flows through the lateral hole 312 to the auxiliary bearing 803 that is a rolling bearing, and then returns to the oil reservoir 730. The oil that reaches the upper portion of the crankpin 301 through the oil passage 311 passes through the slide bearing 210 and further flows into the rolling bearing 401. Most of the oil that has lubricated the rolling bearing 401 passes through the oil drain pipe 408 and returns to the oil sump 730.

  An oil supply pocket 205 is provided on the end surface of the orbiting scroll bearing 203 of the orbiting scroll 200, and the orbiting scroll 200 reciprocates between the outer side and the inner side of the seal ring 410 as the orbiting scroll 200 revolves. And part of the oil between the bearing 401 is conveyed to the back pressure chamber 411. The conveyed oil is supplied to the Oldham coupling 500 and then supplied to the end face 105 of the fixed scroll and the sliding face of the base plate 201 of the orbiting scroll 200.

  The oil conveyed to the back pressure chamber 411 flows into the compression chamber 130 through the back pressure hole or through a minute gap on the sliding surface of the end plate. 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 refrigerant gas in the sealed container 700, and returns to the oil reservoir 730.

  Next, the flow of oil and refrigerant gas discharged from the discharge port 104 of the fixed scroll 100 will be described in detail. Oil and refrigerant gas discharged from the discharge port 104 passes through the frame outer peripheral passage 421 provided on the outer periphery of the fixed scroll 100 and the frame 400 and flows into the guide 423 provided below the frame outer peripheral passage 421. The guide 423 is installed on the inner peripheral surface of the sealed container 700 so as to change the direction of the refrigerant gas containing oil from the frame outer peripheral passage 421 in the circumferential direction. As shown in FIG. 5, the guide 423 includes a minute gap 424 provided at the lower end and a window 425 opened in the circumferential direction of the sealed container 700. Most of the oil and refrigerant gas flowing into the guide 423 flows along the inner peripheral surface of the hermetic container 700 in the space between the frame 400 and the stator 601 through the window 425. Part of the oil and refrigerant gas that has passed through the gap 424 of the guide 423 is used for cooling the lower portion of the stator 601 through the stator outer peripheral passage 426 provided in the outer peripheral portion of the stator 601.

  The oil and refrigerant gas flowing along the inner peripheral surface of the sealed container 700 that has flowed out from the window 425 become a flow in which heavy oil is attached to the inner periphery of the sealed container 700 due to the action of centrifugal force, and is separated from the refrigerant gas. Is done. The separated oil returns to the oil sump 730 through the stator outer peripheral passage 426. The refrigerant gas from which the oil is separated passes through the discharge pipe 701 and is discharged to the outside of the sealed container 700. Here, if there is a leg portion of the frame 400 that hinders the flow of oil and refrigerant gas along the inner periphery of the sealed container 700 in the vicinity of the discharge pipe 701, the flow along the inner periphery of the sealed container 700 collides and the oil scatters. In this embodiment, since the leg portion of the frame 400 is not provided, the oil and the refrigerant gas can be efficiently separated.

  Further, the balance weight 407 provided on the rotary shaft 300 rotates integrally with the rotary shaft 300 and scatters the oil adhering to the balance weight 407. In this embodiment, however, the discharge pipe 701 is placed above the balance weight 407. Due to the arrangement, the scattered oil does not directly flow into the discharge pipe 701.

  The oil that flows out from the window 425 of the guide 423 flows along the inner periphery of the sealed container 700 and becomes a flow that adheres to the inner periphery of the sealed container 700 by centrifugal force. It does not flow to the inner side (center side) than the window portion 425 provided in the window. In this embodiment, by installing the inlet of the discharge pipe 701 provided in the sealed container 700 inside the window 425 of the guide 423, it is not involved in the oil flow, and a stable oil separation function is obtained. be able to.

  In the present embodiment, the window 425 of the guide 423 is formed to open only in the same direction as the rotation direction of the rotation shaft 300. As a result, the flow of the gas around the outer periphery of the balance weight 407 can be made to coincide with the direction of the flow of the oil flowing in the inner periphery of the sealed container 700 and the flow of the refrigerant gas. The oil scattered from the balance weight 407 can be smoothly absorbed in the flow of centrifugal separation, and a stable oil separation function can be obtained.

  Oil and refrigerant gas flowing into the guide 423 collide with the lower end of the guide 423. The collided oil and part of the refrigerant gas flow backward in the guide 423 and are released from the gap between the guide 423 inlet and the lower end of the frame 400, which may reduce the oil separation efficiency. According to the present embodiment, by providing a plurality of frame outer peripheral passages 421 provided on the outer periphery of the fixed scroll 100 and the frame 400, the flow velocity of oil and refrigerant gas flowing into the guide 423 is reduced. Since it becomes possible to reduce the flow which collides and flows backward, efficient oil separation can be obtained.

  Further, if a plurality of frame outer peripheral passages 421 provided on the outer periphery of the fixed scroll 100 and the frame 400 are provided and the fixing bolts 405 are provided between the frame outer peripheral passages 421, the size of the fixing bolts 405 of the fixed scroll and the size of the compression mechanism portion. The design freedom can be secured without any limitation.

  As described above, according to the present embodiment, the discharge pipe 701 is provided on the opposite side of the guide 423 for changing the refrigerant gas from the frame outer peripheral passage 421 in the circumferential direction, and the discharge pipe 701 is provided with a balance weight. A plurality of concave step portions 401c that are disposed above 407 and that are located above the discharge pipe 701 so that the entire lower surface of the compression mechanism support portion 401b of the frame 400 extends along the outer periphery at the lower outer corner of the compression mechanism support portion 410b. And tack welding 740 at a position corresponding to the thick wall portion 401d remaining between the plurality of concave step portions 401c, and the entire lower surface of the compression mechanism support portion 401b of the frame 400 is positioned above the discharge pipe 701. As a result, a scroll compressor with high reliability, which can improve oil separation performance with an inexpensive structure while ensuring a sufficient balance weight function. Rukoto can.

It is a longitudinal cross-sectional view of the scroll compressor of one Embodiment of this invention. It is a cross-sectional view above the stator of the scroll compressor of FIG. It is a cross-sectional view above the fixed scroll of the scroll compressor of FIG. It is the perspective view seen from the bottom face of the flame | frame of the scroll compressor of FIG. It is a perspective view of the guide of the scroll compressor of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Scroll compressor, 2 ... Compression mechanism part, 3 ... Drive part, 100 ... Fixed scroll, 101 ... Base plate, 102 ... Wrap, 103 ... Inlet port, 104 ... Discharge port, 105 ... End plate surface, 130 ... Compression chamber , 200 ... orbiting scroll, 201 ... base plate, 202 ... lap, 203 ... orbiting scroll bearing, 205 ... oil supply pocket, 210 ... sliding bearing, 300 ... rotating shaft, 301 ... crankpin, 302 ... main shaft portion, 303 ... auxiliary bearing Support part, 311 ... Oil passage, 312 ... Horizontal hole, 400 ... Frame, 401 ... Rolling bearing (main bearing), 403 ... Frame cover, 405 ... Bolt, 406 ... Bolt, 407 ... Balance weight, 408 ... Oil drain pipe, 410 ... Seal ring, 411 ... Back pressure chamber, 421 ... Frame outer peripheral passage, 423 ... Guide, 424 ... Bottom gap, 425 ... Window part, 426 Stator outer peripheral passage, 500 ... Oldham coupling, 600 ... Electric motor, 601 ... Stator, 601a ... End coil, 602 ... Rotor, 700 ... Sealed container, 701 ... Discharge pipe, 702 ... Herme terminal, 703 ... Terminal cover, 710 ... Upper cap , 711 ... suction pipe, 720 ... lower cap, 721 ... legs, 722 ... magnet, 730 ... oil sump, 801 ... lower frame, 802 ... housing, 803 ... rolling bearing (sub bearing), 804 ... housing cover, 805 ... Bolt, 900 ... pump part.

Claims (6)

A cylindrical sealed container;
A compression mechanism that is disposed in an upper portion of the sealed container and compresses the working fluid and discharges it upward;
An electric motor disposed at a lower part in the sealed container and driving the compression mechanism part via a rotation shaft;
A bearing that supports the rotating shaft between the electric motor and the compression mechanism;
A bearing support portion for supporting the bearing and a compression mechanism support portion extending outward from an upper portion of the bearing support portion to support the compression mechanism portion, and an outer peripheral surface of the compression mechanism support portion is an inner portion of the sealed container. A frame welded to the circumferential surface at a plurality of locations in the circumferential direction;
A balance weight having an outer peripheral surface located above the stator end coil of the electric motor and facing the inner peripheral surface of the sealed container;
A pump section for supplying lubricating oil to the compression mechanism section and the bearing;
A frame outer peripheral passage provided on the outer peripheral surface of the frame so as to pass the working fluid discharged from the compression mechanism section downward of the frame;
A guide installed on the inner peripheral surface of the sealed container so as to change the direction of the working fluid from the frame outer peripheral passage in the circumferential direction;
A discharge pipe for discharging the working fluid in the space between the frame and the electric motor located on the opposite side of the guide to the outside of the sealed container;
The discharge pipe is disposed above the balance weight,
The entire lower surface of the compression mechanism support portion is positioned above the discharge pipe, and a plurality of concave step portions extending along the outer periphery are formed at the outer peripheral lower corner portion of the compression mechanism support portion. A fluid compressor, wherein the fluid compressor is welded at a position corresponding to a thick-walled portion left in between.   2. The fluid compressor according to claim 1, wherein the plurality of concave steps are provided uniformly in the circumferential direction so that the thick portions remaining between the plurality of concave steps are positioned equally in the circumferential direction. A fluid compressor characterized by the above.   The fluid compressor according to claim 1, wherein a plurality of the frame outer peripheral passages are formed in parallel, and a support bolt that supports the compression mechanism portion on the frame is fastened at a circumferential position between the plurality of frame outer peripheral passages. The fluid compressor is characterized in that the guide is installed so as to communicate with the frame outer peripheral passage.   2. The fluid compressor according to claim 1, wherein a plurality of the frame outer peripheral passages are formed in parallel in a range of one concave step portion of the plurality of concave step portions, and the plurality of frame outer peripheral passages and The fluid compressor, wherein the guide is installed so as to communicate with the recessed step portion positioned.   2. The fluid compressor according to claim 1, wherein a circumferential discharge window of the guide is formed between an outer peripheral surface of the end coil of the stator and an inner peripheral surface of the sealed container, and the flow of the discharge pipe is determined. A fluid compressor characterized in that an inlet is disposed inward from a circumferential discharge window of the guide.   2. The fluid compressor according to claim 1, wherein a discharge window in a circumferential direction of the guide is formed only in the same direction as the rotation direction of the rotation shaft.

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