JP6071660B2 - Scroll fluid machinery - Google Patents

Description

  The present invention relates to a scroll fluid machine such as a scroll compressor and a scroll pump.

  As a conventional scroll fluid machine such as a scroll compressor and a scroll pump, an oil reservoir in which lubricating oil is stored is disposed at the bottom, and an upper portion in the airtight container is disposed, and the respective spiral bodies are combined. A fixed scroll and an orbiting scroll that form a compression chamber between the two spiral bodies, a frame that is disposed below the orbiting scroll in the hermetic container, and slidably supports the orbiting scroll; Between the motor provided below the frame, the motor and the orbiting scroll in the sealed container, and transmitting the driving force of the motor to the orbiting scroll, and between the frame and the motor on the driving shaft A balancer provided at a position, and an oil supply mechanism for supplying lubricating oil between the swing scroll and the frame, Scroll fluid machine oil discharge hole formed in the frame for discharging the supplied excess lubricant under the frame is known between the frame and the.

  In the conventional scroll fluid machine configured as described above, the lubricating oil stored in the oil sump is transferred to the sliding portion between the swing scroll and the frame, between the fixed scroll and the swing scroll, etc. by the oil supply mechanism. Supplied to suppress wear of the sliding portion. In addition, the surplus lubricant in the lubricant supplied to the sliding portion such as between the swing scroll and the frame is removed from the discharge hole formed in the frame between the frame and the motor in the sealed container. It becomes the structure discharged | emitted in the position between.

  For this reason, the conventional scroll fluid machine configured as described above is in a state where the lubricating oil discharged from the oil drain hole or the like collides with the balancer rotating with the drive shaft in the process of returning to the oil sump, and is splashed. There is a problem that the oil is sucked into the compression chamber formed by the fixed scroll and the orbiting scroll and discharged to the outside of the sealed container, and the lubricating oil in the sealed container becomes insufficient.

  Therefore, in the conventional scroll fluid machine, as shown in Patent Document 1, a metal balancer cover that is formed in a bottomed cylindrical shape having an opening at the bottom and is arranged so as to cover the rotation trajectory portion of the balancer from above. Also proposed is a scroll fluid machine having one end connected to a frame oil drain hole and an oil drain pipe that guides the lubricating oil discharged from the oil drain hole to the lower side of the motor.

  In the scroll fluid machine described in Patent Document 1, by providing a balancer cover and an oil drain pipe, the lubricant discharged from the oil drain hole or the like collides with the balancer and splashes, and the lubricated lubricant The oil is prevented from being scattered and sucked into the compression chamber formed by the fixed scroll and the orbiting scroll and discharged outside the sealed container.

Japanese Patent Laying-Open No. 2011-127438 (see, for example, paragraphs [0025] and [0026], FIG. 1 and the like)

  However, the scroll fluid machine described in Patent Document 1 fixes the oil drain pipe by brazing or welding the oil drain pipe to a fixed plate and bolting the fixed plate to the frame together with a metal balancer cover. There must be. For this reason, in the scroll fluid machine described in Patent Document 1, the assembly time of the scroll fluid machine becomes longer by the work of brazing or welding the drain pipe to the fixed plate, and the manufacturing cost of the scroll fluid machine increases. There was a problem that it was.

  The present invention has been made to solve the above-described problems, and does not require brazing or welding work for fixing the oil drain pipe, and can reduce the manufacturing cost of the scroll fluid machine. The purpose is to obtain a fluid machine.

The scroll fluid machine according to the present invention includes a sealed container in which a sump for storing lubricating oil is formed at the bottom, and an upper part in the sealed container. A fixed scroll and an orbiting scroll that form a compression chamber therebetween, a frame that is disposed below the orbiting scroll in the sealed container, and that slidably supports the orbiting scroll; and A motor provided below the frame; a drive shaft that connects the motor and the orbiting scroll in the sealed container; and that transmits the driving force of the motor to the orbiting scroll; and the frame in the drive shaft And a balancer provided at a position between the motor and the motor, and an oil supply mechanism for supplying lubricating oil between the swing scroll and the frame The scroll fluid machine has a drainage hole formed in the frame for discharging excess lubricating oil supplied between the rocking scroll and the frame to the lower side of the frame, the lower part being open A balancer cover that is formed in a bottomed cylindrical shape and is arranged so as to cover the rotation trajectory portion of the balancer from above, and one end of which is connected to the oil drain hole, and the lubricating oil discharged from the oil drain hole is An oil drain pipe that leads to a lower part of the motor, wherein the balancer cover is formed of resin , and the balancer cover and the oil drain pipe are integrally formed, or the oil drain pipe is the balancer cover. It is fixed to the groove part formed in this .

  In the scroll fluid machine according to the present invention, the balancer cover is made of resin. Then, when the balancer cover is resin-molded, the balancer cover and the oil drain pipe are integrally formed, or a groove portion for sandwiching the oil drain pipe is formed in the balancer cover and the oil drain pipe is sandwiched in the groove portion. The balancer cover and the oil drain pipe are integrated. For this reason, since the scroll fluid machine concerning the present invention can abolish brazing or welding work for fixing an oil drain pipe, it can control the manufacturing cost of a scroll fluid machine.

1 is a longitudinal sectional view of a scroll fluid machine 100 according to Embodiment 1 of the present invention. It is a longitudinal cross-sectional view which shows the balancer cover 21 of the scroll fluid machine 100 which concerns on Embodiment 1 of this invention. It is a bottom view which shows the balancer cover 21 of the scroll fluid machine 100 which concerns on Embodiment 1 of this invention. It is a longitudinal cross-sectional view of the scroll fluid machine 100 which concerns on Embodiment 2 of this invention. It is a bottom view which shows the balancer cover 21 and the support plate 23 of the scroll fluid machine 100 concerning Embodiment 2 of this invention, (a) is a bottom view which shows the balancer cover 21, (b) is a bottom view which shows the support plate 23. FIG. It is a principal part enlarged view (longitudinal sectional view) which shows the volt | bolt fixing | fixed part vicinity of the balancer cover 21 of the scroll fluid machine 100 which concerns on Embodiment 2 of this invention. It is a longitudinal cross-sectional view of the scroll fluid machine 100 which concerns on Embodiment 3 of this invention. It is a longitudinal cross-sectional view which shows the balancer cover 21 of the scroll fluid machine 100 which concerns on Embodiment 3 of this invention. It is a principal part enlarged view (perspective view) which shows the stator 109 of the scroll fluid machine 100 which concerns on Embodiment 3 of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Embodiment 1 FIG.
FIG. 1 is a longitudinal sectional view of a scroll fluid machine 100 according to Embodiment 1 of the present invention. FIG. 2 is a longitudinal sectional view showing the balancer cover 21 of the scroll fluid machine 100. FIG. 3 is a bottom view showing the balancer cover 21 of the scroll fluid machine 100.
Hereinafter, based on FIGS. 1-3, the structure and operation | movement of the scroll fluid machine 100 which concern on this Embodiment 1 are demonstrated. In addition, the fluid in the following description is a refrigerant | coolant, for example, and shall differ from lubricating oil.
The scroll fluid machine 100 according to the first embodiment is obtained by improving an oil drain pipe fixing method.

[Configuration of Scroll Fluid Machine 100]
The scroll fluid machine 100 includes a sealed container 102 constituting an outer shell, a suction pipe 103 that guides the fluid to the sealed container 102, a discharge pipe 104 that discharges the compressed fluid, and a subframe that partitions a space in the sealed container 102. 110, a bottom oil sump 131 in which lubricating oil is stored, a fixed scroll 10 for compressing fluid, an orbiting scroll 11 for compressing fluid, and a frame that slidably supports the orbiting scroll 11 15, a main shaft 12 that rotates the rocking scroll 11, an oil pump 91 that pulls up lubricating oil, a motor 139 that rotates the main shaft 12, an Oldham coupling 20 that rocks the rocking scroll 11, and the main shaft 12. The balancer cover 21 that covers the rotation locus of the first balancer 13 from above and the oil drain hole 15h of the frame 15 is drained. The lubricating oil has a scavenge pipe 18 for guiding downward the motor 139, the.

  Further, in the scroll fluid machine 100, the compression chamber 53 formed by the fixed spiral body 10b of the fixed scroll 10 and the swing spiral body 11b of the swing scroll 11, the inner surface of the frame 15, the fixed scroll 10 and the swing scroll. It has a suction chamber 54 formed by the scroll 11 and communicating with the compression chamber 53, and an oil inflow chamber 55 formed by the inner surface of the frame 15 and the lower portion of the swinging scroll 11.

(Sealed container 102)
The sealed container 102 constitutes an outline of the scroll fluid machine 100. In the sealed container 102, at least a fixed scroll 10, a swing scroll 11, a frame 15, a main shaft 12, a motor 139, an Oldham joint 20, and the like are provided.
Further, a suction pipe 103 communicating with the inside of the sealed container 102 below the frame 15 is connected to the side surface 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. Yes.

(Suction pipe 103)
The suction pipe 103 is a pipe for guiding the fluid flowing into the scroll fluid machine 100 into the sealed container 102 (more specifically, in the sealed container 102 below the frame 15). The suction pipe 103 is provided on the side surface of the sealed container 102 so as to communicate with the inside of the sealed container 102.

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

(Subframe 110)
The sub frame 110 holds the main shaft 12 rotatably via a bearing 90. In addition, the main shaft 12 is provided through the central portion of the subframe 110.

(Bottom sump 131)
The bottom oil sump 131 stores lubricating oil. The bottom oil sump 131 is formed at the bottom of the sealed container 102, and the lubricating oil is enclosed beyond the height of the subframe 110, for example.
The bottom oil sump 131 is provided with a lower end portion of the main shaft 12 so that the stored lubricating oil is pulled up from a lubricating oil passage 12b described later formed in the main shaft 12.

(Fixed scroll 10)
The fixed scroll 10 compresses the fluid together with the swing scroll 11. The fixed scroll 10 is disposed opposite to the swing scroll 11. The fixed scroll 10 has a 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 base plate 10a.

  The base plate 10 a constitutes the compression chamber 53 and the suction chamber 54 together with the fixed spiral body 10 b, the swing scroll 11 and the frame 15. The base plate 10a is a flat plate-like member, and an opening 10c for discharging the fluid compressed in the compression chamber 53 is formed in a substantially central portion thereof. The base plate 10 a is substantially parallel to the horizontal plane, and the outer edge of the lower surface of the base plate 10 a is fixed to the upper portion of the frame 15.

  The fixed spiral body 10 b and the swing scroll body 11 b of the swing scroll 11 form a compression chamber 53 whose volume changes as the swing scroll 11 swings. The fixed spiral body 10 b constitutes a suction chamber 54 together with the frame 15 and the swing scroll 11. The fixed spiral body 10b has a spiral cross section in the horizontal section.

(Oscillating scroll 11)
The swing scroll 11 compresses the fluid together with the fixed scroll 10. The swing scroll 11 is disposed to face the fixed scroll 10. The swing scroll 11 includes a base plate 11a substantially parallel to a horizontal plane, a swing spiral body 11b formed to protrude upward from the upper surface of the base plate 11a, and a boss portion formed below the base plate 11a. 11j and a bearing 11c to which the upper end of the main shaft 12 is connected.

The base plate 11a constitutes the compression chamber 53 and the suction chamber 54 together with the swinging spiral body 11b, the fixed scroll 10 and the frame 15. The base plate 11 a is a disk-shaped member, and swings within the frame 15 by the rotation of the main shaft 12.
The base plate 11a is substantially parallel to the horizontal plane, and is provided on the frame 15 (more specifically, on the thrust plate 16) so as to be swingable. In other words, the base plate 11 a can swing on the frame 15 by the rotation of the main shaft 12.

A first concave portion 11f and a second concave portion 11g are formed on the lower surface of the base plate 11a so as to be recessed upward. The first concave portion 11f and the second concave portion 11g are formed on substantially the same straight line (on a straight line or in the vicinity of the straight line), and are formed so as to extend from the center side of the base plate 11a toward the peripheral side. It has been done.
The lower surface of the base plate 11a and the surface that contacts the upper surface of the thrust plate 16 is referred to as a thrust surface 11d.

  The swinging spiral body 11 b compresses the fluid together with the fixed spiral body 10 b of the fixed scroll 10. The swinging spiral body 11b constitutes a compression chamber 53 together with the base plate 11a and the fixed scroll 10, and constitutes a suction chamber 54 together with the frame 15 and the fixed scroll 10. This oscillating spiral body 11b has a spiral cross section corresponding to the horizontal cross section of the fixed spiral body 10b.

The boss portion 11j is a hollow cylindrical member formed below the base plate 11a. The boss part 11j is provided with a bearing 11c to which the main shaft 12 is connected.
The bearing 11 c is provided on the boss portion 11 j and is connected to the upper end portion of the main shaft 12. That is, the bearing 11 c is connected to the main shaft 12 and can transmit the rotation of the main shaft 12 to the swing scroll 11.

(Frame 15)
The frame 15 supports the orbiting scroll 11 so that the orbiting scroll 11 can slide on a thrust plate 16 provided in the frame 15. The frame 15 has a shape in which an upper part and a lower part are opened. And the upper part of the flame | frame 15 is obstruct | occluded by the baseplate 10a of the fixed scroll 10 being provided. A main bearing 15 c that rotatably holds the main shaft 12 is provided at the lower portion of the frame 15.
Further, a fluid passage 15 a for guiding fluid to the suction chamber 54, a thrust support surface 15 b for supporting the thrust plate 16, and an oil inflow chamber 55 to which the lubricating oil in the lubricating oil passage 12 b of the main shaft 12 is guided to the frame 15. And are formed. The frame 15 has an oil drain hole 15h for discharging a part of the lubricating oil supplied to the oil inflow chamber 55 (surplus lubricating oil) so as to penetrate the frame 15 in the vertical direction, for example. Is formed.

The fluid passage 15 a is formed in the scroll fluid machine 100 so as to communicate the outside of the frame 15 and the suction chamber 54 in the frame 15. That is, the fluid that has flowed into the scroll fluid machine 100 flows into the suction chamber 54 via the fluid passage 15a.
The thrust support surface 15 b supports the thrust plate 16. The thrust support surface 15 b is a flat portion formed in the middle of the frame 15 in the vertical direction within the frame 15.
The oil inflow chamber 55 is formed on the lower side of the frame 15, that is, formed by the outer surface of the boss portion 11 j of the orbiting scroll 11 and the lower side portion of the frame 15, and the lubricating oil passage of the main shaft 12. The lubricating oil of 12b is guided.
The oil drain hole 15 h is formed to communicate between the oil inflow chamber 55 in the frame 15 and the outside of the frame 15 in the scroll fluid machine 100. That is, surplus lubricating oil out of the lubricating oil flowing into the oil inflow chamber 55 is discharged inside the scroll fluid machine 100 and outside the frame 15 through the oil drain hole 15h. ing.

  A thrust plate 16 that is a constituent member of the frame 15 supports the swing scroll 11 in a slidable manner. That is, the base plate 11a of the rocking scroll 11 is provided on the upper surface of the thrust plate 16, and the base plate 11a can slide on the upper surface. Further, the thrust plate 16 is provided between the lower surface of the base plate 11 a of the swing scroll 11 and the thrust support surface 15 b of the frame 15.

(Spindle 12)
A main shaft 12 that is a drive shaft is a shaft connected to the orbiting scroll 11. In the main shaft 12, an eccentric portion 12 a connected to the bearing 11 c of the orbiting scroll 11 is formed at the upper end portion of the main shaft 12, and a lubricating oil passage 12 b that guides lubricating oil is formed in the main shaft 12.
The central portion of the eccentric portion 12a is a portion formed by being shifted by a predetermined amount in the horizontal direction with respect to the rotation axis of the main shaft 12.
The lubricating oil passage 12 b is for guiding the lubricating oil to each sliding portion of the scroll fluid machine 100. The lubricating oil passage 12b is formed in the vertical direction inside the bearing 11c. The lubricating oil passage 12 b is connected to a bottom oil sump 131 provided at the lower part in the scroll fluid machine 100, and can guide the lubricating oil stored in the bottom oil sump 131. Although not shown, since the lubricating oil passage 12b is branched in the horizontal direction, the lubricating oil in the lubricating oil passage 12b is also supplied to the oil inflow chamber 55 formed in the lower side in the frame 15. It has come to be.

  Further, the main balance 12 is provided with a first balancer 13 at a position between the frame 15 and the motor 139. The first balancer 13, together with the second balancer 14 provided below the rotor 129 of the motor 139, prevents the deflection of the main shaft 12 that occurs with the swinging motion of the swing scroll 11. That is, the first balancer 13 and the second balancer 14 not only have a static balance, but also have a dynamic balance with respect to the moment of inertia generated in the main shaft 12 and the rotor 129 as the rocking scroll 11 swings. Balanced.

(Oil pump 91)
The oil pump 91 pulls up the lubricating oil from the bottom oil sump 131. The oil pump 91 is provided at the lower end of the main shaft 12. As this oil pump 91, for example, a centrifugal pump, a positive displacement pump, or the like that generates a pump action (use of differential pressure) by the rotation of the main shaft 12 may be adopted.

(Motor 139)
The motor 139 rotates the main shaft 12. That is, the driving force of the motor 139 is transmitted to the orbiting scroll 11 via the main shaft 12. The motor 139 includes a stator 109 fixedly supported on the hermetic container 102 and a rotor 129 that generates torque by being combined with the stator 109.
The motor 139 partitions an upper space in which the swing scroll 11 and the fixed scroll 10 are provided and a lower space in which the bottom oil sump 131 is provided.
The stator 109 is configured, for example, by mounting a multi-phase winding on a laminated iron core.
The rotor 129 has, for example, a permanent magnet (not shown) inside and is held with a predetermined gap from the inner wall surface of the stator 109. The rotor 129 rotates when the energization of the stator 109 starts to rotate the main shaft 12. It is something to be made.

(Oldham joint 20)
The Oldham coupling 20 is disposed on the thrust surface 11d of the orbiting scroll 11 and functions to prevent the rotation movement of the orbiting scroll 11 during the orbiting movement. In other words, the Oldham joint 20 functions to prevent the swinging motion of the swing scroll 11 and to enable the swinging motion.

(Balancer cover 21)
The balancer cover 21 is arranged so as to cover the rotation trajectory portion of the first balancer 13 from above, and when the lubricating oil collides with the rotating first balancer 13 and sprays, the sprayed lubricating oil is compressed into the compression chamber. 53 prevents inhalation. The balancer cover 21 is formed of a resin, and is formed in a bottomed cylindrical shape having an open bottom. Specifically, the balancer cover 21 is formed of a bottom surface portion 21a and cylindrical side edge portions extending downward from the outer peripheral edge portion of the bottom surface portion 21a. In addition, a spindle through hole 21c through which the spindle 12 and the main bearing 15c of the frame 15 pass is formed in the bottom surface portion 21a substantially at the center. In addition, a plurality of spacer insertion holes 21d (through holes) into which the spacers 22 are inserted are also formed in the bottom surface portion 21a, and cylindrical spacers 22 made of metal are inserted into the spacer insertion holes 21d. Yes. The balancer cover 21 is attached to the lower surface portion of the frame 15 by inserting bolts 25 into the spacers 22 provided on the bottom surface portion 21 a and fixing the spacer 22 to the lower surface portion of the frame 15 with the inserted bolts 25.

  Further, on the outer peripheral surface of the side surface portion 21b of the balancer cover 21, for example, a protrusion extending in the vertical direction is formed, and an oil drain pipe holding hole 21e is formed so as to penetrate the protrusion. . In the first embodiment, when the balancer cover 21 is resin-molded, the metal drainage pipe 18 and the balancer cover 21 are integrally molded. Thereby, the oil drain pipe 18 is held in the oil drain pipe holding hole 21e, and the balancer cover 21 and the oil drain pipe 18 are integrated. In addition, in order to increase the adhering force between the balancer cover 21 and the oil draining pipe 18, it is preferable to perform knurling on the outer peripheral surface of the oil draining pipe 18 (it is preferable to form a protrusion or a concave groove). .

(Oil draining pipe 18)
The oil drain pipe 18 guides the lubricating oil discharged from the oil drain hole 15 h of the frame 15 to the lower side of the motor 139, that is, to the bottom oil sump 131. The oil drain pipe 18 has one end connected to the oil drain hole 15 h of the frame 15 and the other end disposed below the motor 139.
Note that the lower end of the oil drain pipe 18 may be lower than the upper end of the stator 109. By disposing the lower end of the drainage pipe 18 below the upper end of the stator 109, the lubricating oil that has flowed out of the drainage pipe 18 into the airflow in the upper space of the stator 109, that is, the airflow into which the fluid is drawn into the suction chamber 54 Can be prevented from being caught.
Here, in the first embodiment, the lower end of the oil draining pipe 18 is disposed below the motor 139. When the scroll fluid machine 100 is assembled, the oil draining pipe 18 is reliably bent without being bent. This is so that it can be confirmed whether or not it is assembled. Specifically, the stator 109 is fixed in the sealed container 102 by shrink fitting or the like. Thereafter, the frame 15 to which the balancer cover 21 and the oil drain pipe 18 are attached is incorporated into the sealed container 102. At this time, by configuring the closed container 102 as an upper container part, a side container part, a lower container part, and the like, the stator 109 and the frame 15 are incorporated in the side container part. For this reason, if the side container part and the lower container part are welded, the lower end of the oil drain pipe 18 can be confirmed from below the side container part (that is, the subframe 110 side). It is possible to confirm whether or not the oil drain pipe 18 is securely assembled without bending the pipe 18.

  In the scroll fluid machine 100 according to the first embodiment, the balancer cover 21 and the oil drain pipe 18 are integrated, and then the balancer cover 21 is attached to the lower surface portion of the frame 15. That is, the oil drain pipe 18 is also attached to the frame 15 by attaching the balancer cover 21 to the lower surface portion of the frame 15. For this reason, unlike the scroll fluid machine described in Patent Document 1, the scroll fluid machine 100 according to the first embodiment can eliminate the brazing or welding work for fixing the oil drain pipe 18. The manufacturing cost of the fluid machine 100 can be suppressed.

(Compression chamber 53)
The compression chamber 53 is formed by the lower surface of the base plate 10a and the fixed spiral body 10b, and the upper surface of the base plate 11a and the swinging spiral body 11b. The compression chamber 53 communicates with the suction chamber 54. The compression chamber 53 can compress the inflowing fluid as it moves to the center of the compression chamber 53 by the action of the swing motion of the swing scroll 11 with respect to the fixed scroll 10.

(Suction chamber 54)
The suction chamber 54 is formed by the inner surface of the frame 15, the outer periphery of the base plate 11a, the upper surface of the thrust plate 16, the outer surface of the fixed spiral body 10b, and the outer surface of the swinging spiral body 11b. The suction chamber 54 communicates with the compression chamber 53 and the fluid passage 15a. That is, the suction chamber 54 can supply the fluid flowing in through the fluid passage 15 a to the compression chamber 53.
The suction chamber 54 communicates with the oil inflow chamber 55 through the first oil hole 16a of the thrust plate 16 and the first recess 11f of the swing scroll 11, and the second oil hole 16b of the thrust plate 16 and the swing. It communicates with the oil inflow chamber 55 through the second recess 11 g of the scroll 11. That is, the suction chamber 54 is supplied with lubricating oil that has flowed in through the first oil hole 16a and the second oil hole 16b, and the sliding portions at various places are lubricated.
The flow rate Q of the lubricating oil supplied to the suction chamber 54 is determined by the differential pressure between the oil pressure in the oil inflow chamber 55 and the pressure P2 in the suction chamber 54.

(Oil inflow chamber 55)
The oil inflow chamber 55 is formed by the outer surface of the boss portion 11 j and the lower portion of the frame 15.
The oil inflow chamber 55 communicates with the lubricating oil passage 12 b of the main shaft 12. That is, the oil inflow chamber 55 is supplied with the lubricating oil that has flowed in through the lubricating oil passage 12b.
The oil inflow chamber 55 communicates with the suction chamber 54 via the first recess 11f and the first oil hole 16a, and communicates with the suction chamber 54 via the second recess 11g and the second oil hole 16b. . That is, the lubricating oil that has flowed in through the lubricating oil passage 12b is supplied to the oil inflow chamber 55, and the supplied lubricating oil includes the path of the first recess 11f and the first oil hole 16a, the second recess 11g, It is supplied to the suction chamber 54 through the path of the second oil hole 16b. In addition, the lubricating oil supplied to the oil inflow chamber 55 is interposed between the thrust surface 11d of the orbiting scroll 11 and the thrust plate 16 which is a constituent member of the frame 15 via the first recess 11f and the second recess 11g. Is also supplied.

[Description of Operation of Scroll Fluid Machine 100]
The scroll fluid machine 100 configured as described above operates as follows.
The rotor 129 rotates in response to a rotational force from a rotating magnetic field generated by the stator 109. Along with this, the main shaft 12 fixed to the rotor 129 is rotationally driven. In the swing scroll 11, the rotation of the main shaft 12 is converted into a swing motion by the Oldham joint 20. By the rotational drive of the main shaft 12, the fluid in the sealed container 102 flows into the compression chamber 53 formed by the fixed spiral body 10b and the swing spiral body 11b, and the suction process starts.

When fluid is sucked into the compression chamber 53, the fluid is compressed in the compression chamber 53 by the swinging motion of the swing scroll 11. And the fluid compressed in the compression chamber 53 transfers to a discharge process. That is, the fluid is discharged from the scroll fluid machine 100 through the opening 10 c of the fixed scroll 10 and the discharge pipe 104.
Specifically, when the scroll fluid machine 100 operates, the flow of fluid and lubricating oil in the scroll fluid machine 100 is as follows.

[Flow of fluid and lubricating oil]
(fluid)
The fluid that flows into the sealed container 102 from the suction pipe 103 flows into the suction chamber 54 via the fluid passage 15a. The fluid flowing into the suction chamber 54 is mixed with the lubricating oil flowing in from the first oil hole 16a and the second oil hole 16b. The fluid mixed with the lubricating oil flows into the compression chamber 53. The fluid flowing into the compression chamber 53 gradually moves to the center of the fixed spiral body 10b and the swing spiral body 11b while being compressed by the action of the swing motion of the swing scroll 11 with respect to the fixed scroll 10. And the fluid which moved to the center of the fixed spiral body 10b and the rocking spiral body 11b is discharged from the opening part 10c formed in the baseplate 10a.

(Lubricant)
The lubricating oil stored in the bottom oil sump 131 rises in the lubricating oil passage 12b by the pumping action (use of differential pressure) of the oil pump 91. A part of the lubricating oil rising in the lubricating oil passage 12b is supplied to the bearing 11c and the main bearing 15c, adheres to the bearing 11c, the main bearing 15c, and their peripheral members, and suppresses wear between the members. The remainder of the lubricating oil that has risen in the lubricating oil passage 12 b flows into the oil inflow chamber 55.

  When a part of the lubricating oil flowing into the oil inflow chamber 55 is located at a position where the oil inflow chamber 55 and the suction chamber 54 communicate with each other through the first recess 11f and the first oil hole 16a, It flows into the suction chamber 54 through the first recess 11f and the first oil hole 16a. Similarly, part of the lubricating oil that has flowed into the oil inflow chamber 55 has the orbiting scroll 11 at a position where the oil inflow chamber 55 and the suction chamber 54 communicate with each other via the second recess 11g and the second oil hole 16b. Sometimes, it flows into the suction chamber 54 through the second recess 11g and the second oil hole 16b.

  The lubricating oil flowing into the suction chamber 54 is mixed with the fluid in the suction chamber 54. Then, the lubricating oil mixed with the fluid in the suction chamber 54 flows into the compression chamber 53. The lubricating oil that has flowed into the compression chamber adheres to the side surface portion of the fixed spiral body 10b, the side surface portion of the swinging spiral body 11b, the base plate 10a, and the base plate 11a, thereby improving the airtightness of the compression chamber 53, These wears are suppressed.

A part of the lubricating oil flowing into the oil inflow chamber 55 passes through the first recess 11f and the first oil hole 16a, and the second recess 11g and the second oil hole 16b. It is also supplied between the thrust surface 11d and the thrust plate 16 which is a constituent member of the frame 15, and suppresses these wears.
That is, the oil pump 91, the lubricating oil passage 12b, the oil inflow chamber 55, the first recess 11f, the second recess 11g, the first oil hole 16a, and the second oil hole 16b correspond to the oil supply mechanism of the present invention.

  Further, the remaining lubricating oil flowing into the oil inflow chamber 55 (that is, the surplus refrigerant out of the lubricating oil supplied between the rocking scroll 11 and the frame 15) passes through the oil drain hole 15h. It is discharged below the frame 15 in the scroll fluid machine 100.

  Here, in the case of the scroll fluid machine not provided with the oil drain pipe 18 shown in the first embodiment, the lubricating oil discharged to the lower side of the frame 15 from the oil drain hole 15h is between the frame 15 and the motor 139. It will be released to the space between. For this reason, the lubricating oil discharged from the oil discharge hole 15h collides with the first balancer 13 that rotates together with the main shaft 12, and is splashed. For this reason, there is a concern that the sprayed lubricating oil is sucked into the compression chamber 53 and discharged out of the sealed container 102, and the lubricating oil in the sealed container 102 becomes insufficient. However, the scroll fluid machine according to the first embodiment guides the lubricating oil discharged from the oil discharge hole 15h to the lower side of the motor 139, that is, to the bottom oil sump 131. For this reason, the lubricating oil discharged from the oil drain hole 15h collides with the first balancer 13 to be splashed, that is, the splashed lubricating oil is sucked into the compression chamber 53 and discharged outside the sealed container 102. Thus, it is possible to prevent the lubricating oil in the sealed container 102 from being insufficient.

  Further, the remainder of the lubricating oil flowing into the oil inflow chamber 55 is discharged below the frame 15 even if it passes through the main bearing 15c (that is, between the main shaft 12 and the frame 15). The lubricating oil discharged below the frame 15 through this path collides with the first balancer 13 located below the main bearing 15c and splashes. For this reason, in the case of the scroll fluid machine not provided with the balancer cover 21 shown in the first embodiment, the sprayed lubricating oil scatters and is sucked into the compression chamber 53 and discharged out of the sealed container 102. Therefore, there is a concern that the lubricating oil in the sealed container 102 is insufficient. However, the scroll fluid machine 100 according to the first embodiment is provided with the balancer cover 21 so as to cover the rotation locus portion of the first balancer 13 from above. For this reason, the splashed lubricating oil can be captured by the inner surface portion of the balancer cover 21, and the captured lubricating oil can be guided downward by its own weight. That is, since the scroll fluid machine 100 according to the first embodiment includes the balancer cover 21, the sprayed lubricating oil scatters and is sucked into the compression chamber 53 and discharged out of the sealed container 102. This can be suppressed, and the lack of lubricating oil in the sealed container 102 can be suppressed.

[Effects of Scroll Fluid Machine 100 According to Embodiment 1]
As described above, in the scroll fluid machine 100 according to the first embodiment, the balancer cover 21 and the oil drain pipe 18 are integrated, and then the balancer cover 21 is attached to the lower surface portion of the frame 15. That is, the oil drain pipe 18 is also attached to the frame 15 by attaching the balancer cover 21 to the lower surface portion of the frame 15. For this reason, unlike the scroll fluid machine described in Patent Document 1, the scroll fluid machine 100 according to the first embodiment can eliminate the brazing or welding work for fixing the oil drain pipe 18. The manufacturing cost of the fluid machine 100 can be suppressed.

  In the scroll fluid machine 100 according to the first embodiment, the resin balancer cover 21 is not directly bolted, but the resin balancer cover 21 is framed via the spacer 22 integrally formed with the balancer cover 21. 15 is fixed. For this reason, the scroll fluid machine 100 according to the first embodiment can avoid the loosening of the bolt due to the contraction of the resin, as compared with the case where the resin balancer cover 21 is directly bolted.

  In the first embodiment, the arrangement position of the lower end portion of the side surface portion 21b of the balancer cover 21 is not particularly mentioned, but for example, the position of the lower end portion of the side surface portion 21b of the balancer cover 21 is changed to the position of the motor 139. You may arrange | position below the upper coil end 109a (upper end part of the coil | winding inserted in the stator) of the stator 109. FIG. By configuring the balancer cover 21 in this way, when the lubricating oil colliding with the first balancer 13 and splashing is about to be sucked into the compression chamber 53 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. For this reason, it is possible to further suppress the splashed lubricating oil from being sucked into the compression chamber 53 and discharged to the outside of the sealed container 102 and the lubricating oil in the sealed container 102 being insufficient.

  Further, in the first embodiment, the balancer cover 21 and the oil drain pipe 18 are integrally formed by integrally forming the balancer cover 21 and the oil drain pipe 18. For example, the balancer cover 21 and the oil drain pipe 18 are integrated by forming, for example, a groove portion having a U-shaped cross section in the side surface portion 21b of the balancer cover 21 and sandwiching the oil drain pipe 18 in the groove portion. (Refer to an oil draining pipe clamping groove 21g described later in Embodiment 3).

Embodiment 2. FIG.
In the first embodiment, the balancer cover 21 is attached to the frame 15 via the spacer 22 provided on the balancer cover 21. However, the method of attaching the balancer cover 21 is not limited to the configuration shown in the first embodiment. For example, the balancer cover 21 may be attached to the frame 15 with the following configuration. Note that a configuration not particularly described in the second embodiment is the same as that of the first embodiment, and the same function and configuration are described using the same reference numerals.

FIG. 4 is a longitudinal sectional view of the scroll fluid machine 100 according to the second embodiment of the present invention. FIG. 5 is a bottom view showing the balancer cover 21 and the support plate 23 of the scroll fluid machine 100, (a) is a bottom view showing the balancer cover 21, and (b) is a bottom view showing the support plate 23. FIG. 6 is an enlarged view (longitudinal sectional view) of the main part showing the vicinity of the bolt fixing part of the balancer cover 21 of the scroll fluid machine 100.
Hereinafter, the scroll fluid machine 100 according to the second embodiment will be described with reference to FIGS. 4 to 6.

The basic configuration of the balancer cover 21 according to the second embodiment is the same as that of the balancer cover 21 shown in the first embodiment.
That is, the balancer cover 21 according to the second embodiment is also formed of a resin and has a bottomed cylindrical shape with an opening at the lower portion, as in the first embodiment. Specifically, the balancer cover 21 according to the second embodiment is formed of a bottom surface portion 21a and cylindrical side edge portions extending downward from the outer peripheral edge portion of the bottom surface portion 21a. In addition, a spindle through hole 21c through which the spindle 12 and the main bearing 15c of the frame 15 pass is formed in the bottom surface portion 21a substantially at the center. And the balancer cover 21 which concerns on this Embodiment 2 is arrange | positioned so that the rotation locus part of the 1st balancer 13 may be covered from upper direction similarly to Embodiment 1. FIG. Similarly to the first embodiment, the balancer cover 21 according to the second embodiment is also formed with an oil drain pipe holding hole 21e, and the oil drain pipe 18 is held in the oil drain pipe holding hole 21e. It is integrated with the oil pipe 18. That is, when the balancer cover 21 is resin-molded, the metal oil drain pipe 18 and the balancer cover 21 are integrally molded.

The balancer cover 21 according to the second embodiment is different from the balancer cover 21 shown in the first embodiment in the mounting configuration of the balancer cover 21.
Specifically, the scroll fluid machine 100 according to the second embodiment includes a metal support plate 23 that sandwiches the bottom surface portion 21 a of the balancer cover 21 with the lower surface portion of the frame 15. The support plate 23 is formed with a plurality of through holes 23a into which the bolts 25 are inserted. In addition, the bottom surface portion 21a of the balancer cover 21 is formed with a cutout portion 21f by cutting, for example, a range facing the through hole 23a and a peripheral edge thereof. In the second embodiment, the range of the support plate 23 facing the cut portion 21f is convex toward the bottom surface portion 21a of the balancer cover 21, and the convex shape is a shape corresponding to the cut portion 21f. ing. For this reason, the alignment of the cut portion 21f of the balancer cover 21 and the through hole 23a of the support plate 23 is facilitated.

  In the scroll fluid machine 100 configured as in the second embodiment, the bottom plate 21 a of the balancer cover 21 is inserted by inserting bolts 25 into the through holes 23 a and fixing the support plate 23 to the lower surface of the frame 15. Is sandwiched between the support plate 23 and the lower surface portion of the frame 15 except for the cut portion 21f. Further, the support plate 23 is deformed in the direction of the frame 15 by the fastening force of the bolts 25, and a reaction force (elastic force) is applied. That is, the scroll fluid machine 100 according to the second embodiment fixes the balancer cover 21 to the lower surface portion of the frame 15 by the reaction force acting on the support plate 23.

[Effects of scroll fluid machine according to Embodiment 2]
As described above, in the scroll fluid machine 100 according to the second embodiment, after the balancer cover 21 and the oil drain pipe 18 are integrated, the balancer cover 21 is attached to the lower surface portion of the frame 15 as in the first embodiment. Attach to. That is, the oil drain pipe 18 is also attached to the frame 15 by attaching the balancer cover 21 to the lower surface portion of the frame 15. For this reason, unlike the scroll fluid machine described in Patent Document 1, the scroll fluid machine 100 according to the second embodiment can eliminate the brazing or welding work for fixing the oil drain pipe 18. As in the first embodiment, the manufacturing cost of the scroll fluid machine 100 can be suppressed.

  In addition, since the scroll fluid machine 100 according to the second embodiment can fix the balancer cover 21 with a single support plate 23, an implementation that requires a plurality of spacers 22 to fix the balancer cover 21. Compared with the scroll fluid machine 100 of the first embodiment, the number of parts of the scroll fluid machine 100 can be reduced. For this reason, the scroll fluid machine 100 according to the second embodiment can further reduce the manufacturing cost of the scroll fluid machine 100 as compared with the scroll fluid machine 100 shown in the first embodiment.

  In the second embodiment, the cut portion 21f is formed by cutting out the bottom surface portion 21a of the balancer cover 21, but the cut portion 21f is formed by forming a through hole in the bottom surface portion 21a of the balancer cover 21. May be.

Embodiment 3 FIG.
The mounting structure of the balancer cover 21 is not limited to the first and second embodiments. For example, the balancer cover 21 can be mounted on the frame 15 with the following structure. Note that a structure not particularly described in the third embodiment is the same as that in the first or second embodiment, and the same function or structure is described using the same reference numeral.

FIG. 7 is a longitudinal sectional view of a scroll fluid machine 100 according to Embodiment 3 of the present invention. FIG. 8 is a longitudinal sectional view showing the balancer cover 21 of the scroll fluid machine 100. FIG. 9 is an enlarged view (perspective view) showing a main part of the stator 109 of the scroll fluid machine 100.
Hereinafter, the scroll fluid machine 100 according to the third embodiment will be described with reference to FIGS.

  Similarly to the first and second embodiments, the balancer cover 21 of the scroll fluid machine 100 according to the third embodiment is also formed of a resin and is formed in a bottomed cylindrical shape having an open bottom. Further, the balancer cover 21 according to the third embodiment has, for example, a drain pipe holding groove 21g having a U-shaped cross section on the side surface portion 21b (more specifically, a protrusion formed on the outer peripheral surface of the side surface portion 21b). Is formed. The balancer cover 21 and the drainage pipe 18 are integrated by sandwiching the drainage pipe 18 in the drainage pipe clamping groove 21g.

The balancer cover 21 according to the third embodiment is formed at the lower end portion of the side surface portion 21b, and is fixed by an engaging recess 21h that opens downward.
Specifically, in the third embodiment, the stator 109 of the motor 139 is configured as shown in FIG. In other words, the stator 109 is provided with insulators 109d at the upper and lower portions of the teeth 109c protruding inward from the back yoke 109b. And the coil | winding is wound by the outer periphery of the teeth 109c and the insulator 109d (not shown). In the balancer cover 21 according to the third embodiment, the engagement recess 21h is engaged with the insulator 109d disposed on the top of the tooth 109c, and the claw 21i of the engagement recess 21h is engaged with the recess (not shown) of the insulator 109d. ) And fixed. In this state, the engagement recess 21 h of the balancer cover 21 covers the upper part of the winding of the stator 109.
By configuring the balancer cover 21 in this way, it is possible to prevent the lubricating oil that collides with the first balancer 13 and splashed into the compression chamber 53 between the balancer cover 21 and the motor 139.

  The insulator 109d is formed with a flow path 109e penetrating from the main shaft 12 side to the side surface side of the sealed container 102. The channel 109e has a horizontally long cross section in order to increase the cross section of the channel. In addition, the flow passage 109e is extended in the vertical direction in order to prevent the flow passage 109e from being crushed by a load when the winding is wound, even when the flow passage section of the flow passage 109e is enlarged. Thus, a wall body 109f that partitions the flow path 109e in the lateral direction is formed.

As described above, the scroll fluid machine 100 according to the third embodiment covers the insulator 109d with the engagement recess 21h and closes the flow path between the balancer cover 21 and the motor 139. For this reason, the balancer cover 21 tends to be in a state where the concentration of the lubricating oil is high. And if the 1st balancer 13 rotates in the balancer cover 21 in which the density | concentration of lubricating oil became high, stirring loss will increase. However, in the scroll fluid machine 100 according to the third embodiment, the lubricating oil that has been captured by the balancer cover 21 and dropped by its own weight flows out of the balancer cover 21 through the flow path 109e of the insulator 109d. For this reason, since it can suppress that the density | concentration of the lubricating oil in the balancer cover 21 becomes high, stirring loss can also be reduced.
Note that the lubricating oil that has flowed out of the balancer cover 21 returns to the bottom oil sump 131 through the flow path 109g formed in the outer peripheral portion of the stator 109.

  Here, when the balancer cover 21 is fixed as in the third embodiment, the gap between the lower surface portion of the frame 15 and the balancer cover 21 depends on the processing accuracy and assembly accuracy of each component of the scroll fluid machine 100. May become larger. In such a case, the lubricating oil splashed by colliding with the first balancer 13 flows out of the balancer cover 21 from the gap, and the outflowing lubricating oil is sucked into the compression chamber 53 and discharged out of the sealed container 102. There is a concern that it will be. For this reason, the scroll fluid machine 100 according to the third embodiment is provided with an O-ring 24 between the lower surface portion of the frame 15 and the balancer cover 21. Thereby, even when the clearance between the lower surface portion of the frame 15 and the balancer cover 21 becomes large due to processing accuracy, assembly accuracy, etc. of each component of the scroll fluid machine 100, the lower surface portion of the frame 15 and the balancer cover 21. It can be suppressed that the lubricating oil splashed from the gap between the two and the balancer cover 21 flows out and the lubricating oil in the sealed container 102 is insufficient.

[Effects of the scroll fluid machine according to Embodiment 3]
As described above, in the scroll fluid machine 100 according to the third embodiment, the balancer cover 21 and the oil drain pipe 18 are integrated after the balancer cover 21 and the oil drain pipe 18 are integrated, as in the first and second embodiments. It is attached to the lower surface of the frame 15. For this reason, unlike the scroll fluid machine described in Patent Document 1, the scroll fluid machine 100 according to the third embodiment can eliminate the brazing or welding work for fixing the oil drain pipe 18. As in the first and second embodiments, the manufacturing cost of the scroll fluid machine 100 can be reduced.

  Further, the scroll fluid machine 100 according to the third embodiment does not require the bolt 25 or the like for the attachment of the balancer cover 21. For this reason, the scroll fluid machine 100 according to the third embodiment can further reduce the manufacturing cost of the scroll fluid machine 100 as compared with the scroll fluid machine 100 shown in the first and second embodiments.

  In the scroll fluid machine 100 according to the third embodiment, since the winding of the stator 109 is covered with the engaging recess 21h of the balancer cover 21, it is possible to prevent a decrease in insulation due to adhesion of foreign matter to the winding. it can.

  The reason why the balancer cover 21 is attached as in the third embodiment is that the balancer cover 21 is formed of a resin having a higher insulating property than metal. In other words, in the conventional scroll fluid machine in which the balancer cover is formed of metal, in order to prevent the balancer cover from coming into contact with the windings, the scrolling machine is arranged on the inner peripheral side (the main shaft 12 side) by a predetermined distance from the windings. It was necessary to place a balancer cover. On the other hand, the scroll fluid machine 100 according to the third embodiment in which the balancer cover 21 is formed of resin can bring the balancer cover 21 closer to the winding than in the related art. For this reason, the degree of freedom in designing the first balancer 13 is increased by the increase in the volume in the balancer cover 21, and the unbalance cancellation rate of the main shaft 12 can be increased. Can also be suppressed.

  10 fixed scroll, 10a base plate, 10b fixed spiral body, 10c opening, 11 swing scroll, 11a base plate, 11b swing spiral body, 11c bearing, 11d thrust surface, 11f first recess, 11g second recess, 11j Boss part (lower part of orbiting scroll), 12 spindle, 12a eccentric part, 12b lubricating oil passage, 13 first balancer, 14 second balancer, 15 frame, 15a fluid passage, 15b thrust support surface, 15c main bearing, 15h Oil drain hole, 16 thrust plate, 16a 1st oil hole, 16b 2nd oil hole, 18 oil drain pipe, 20 Oldham joint, 21 balancer cover, 21a bottom surface part, 21b side surface part, 21c spindle through hole, 21d spacer insertion hole (Through hole), 21e Oil drain pipe holding hole, 21f Cut part, 21g Oil drain pipe sandwiched Groove, 21h engaging recess, 21i claw, 22, spacer, 23 support plate, 23a through hole, 24 O-ring, 25 bolt, 53 compression chamber, 54 suction chamber, 55 oil inflow chamber, 90 bearing, 91 oil pump, 100 Scroll fluid machine, 102 airtight container, 103 suction pipe, 104 discharge pipe, 109 stator, 109a upper coil end, 109b back yoke, 109c teeth, 109d insulator, 109e flow path, 109f wall body, 109g flow path, 110 subframe, 129 rotor, 131 bottom sump, 139 motor.

Claims (8)

A sealed container in which a sump for storing lubricating oil is formed at the bottom;
A fixed scroll and an orbiting scroll which are arranged in the upper part of the sealed container and form a compression chamber between the two spiral bodies by being combined with each other;
A frame disposed below the orbiting scroll in the hermetic container and slidably supporting the orbiting scroll;
A motor provided below the frame in the sealed container;
A drive shaft that connects the motor and the orbiting scroll in the sealed container, and transmits a driving force of the motor to the orbiting scroll;
A balancer provided at a position between the frame and the motor on the drive shaft;
An oil supply mechanism for supplying lubricating oil between the swing scroll and the frame;
With
A scroll fluid machine having an oil drain hole formed in the frame for discharging excess lubricating oil supplied between the swing scroll and the frame to the lower side of the frame;
A balancer cover that is formed in a bottomed cylindrical shape with an opening at the bottom, and is arranged so as to cover the rotation trajectory portion of the balancer from above;
One end is connected to the oil drain hole, and an oil drain pipe that guides the lubricating oil discharged from the oil drain hole to the lower side of the motor,
With
The balancer cover is made of resin ;
The scroll fluid machine, wherein the balancer cover and the oil drain pipe are integrally formed, or the oil drain pipe is fixed to a groove formed in the balancer cover . At the bottom of the balancer cover, a plurality of metal spacers that penetrate the bolts are provided,
The scroll fluid machine according to claim 1, wherein the balancer cover is fixed to the frame by fixing the spacer to the frame with a bolt. A metal support plate that sandwiches the bottom of the balancer cover with the frame,
Fixing the support plate to the frame with bolts inserted into through holes formed in the support plate;
The scroll fluid machine according to claim 1, wherein the balancer cover is fixed to the frame by a reaction force of the support plate.   The scroll fluid machine according to any one of claims 1 to 3, wherein a lower end portion of the balancer cover is disposed below an upper coil end of a stator of the motor. An insulator is provided on the upper part of the stator of the motor,
An engagement recess is formed at the lower end of the balancer cover,
2. The scroll according to claim 1, wherein a claw formed in the engagement recess is engaged in a state of being fitted in a recess formed in the insulator, and the balancer cover is fixed to the insulator. Fluid machinery.   The scroll fluid machine according to claim 5, wherein a flow path that penetrates from the drive shaft side to the side surface side of the sealed container is formed in the insulator. The flow path formed in the insulator has a horizontally long cross section.
The scroll fluid machine according to claim 6, wherein a wall body that extends in the vertical direction and divides the flow path in the lateral direction is formed in the flow path.   The scroll fluid machine according to any one of claims 5 to 7, wherein an O-ring is provided between the frame and the balancer cover.

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