JP5642014B2 - Hermetic electric compressor - Google Patents

Description

  The present invention relates to a hermetic electric compressor, and more particularly to a hermetic electric compressor used for refrigerant compression in a refrigeration cycle apparatus such as an air-conditioning / refrigeration apparatus.

Conventionally, in a rotary compressor used in a refrigeration cycle apparatus such as an air conditioner, an electric motor section and a compression mechanism section are housed in a sealed container.
The electric motor unit includes a stator fixed to the inner surface of the hermetic container, and a rotor having a bearing unit rotatably supported by upper and lower bearing units inside the stator.
The compression mechanism part is a rolling piston type compression mechanism part that compresses refrigerant gas, and the upper and lower end surfaces are connected to the eccentric part of the drive shaft by rotating the drive shaft supported by the bearing. The reciprocated piston moves back and forth to compress the refrigerant.

Next, the operation of the refrigerant circuit will be described.
The refrigerant outside the hermetic container in the refrigerant circuit constituting the refrigeration cycle is sucked into the hermetic container via the suction pipe attached to the upper part of the suction muffler of the rotary compressor. The low-pressure refrigerant gas that passes through the suction muffler from the suction pipe, is sucked into the sealed container, and is further sucked into the compression chamber in the cylinder is compressed to a high pressure by a rotary compression mechanism composed of the cylinder, piston, and vane. After that, it is discharged from a discharge port provided in the frame through a discharge muffler to a refrigerant circuit outside the sealed container by a discharge pipe.

Since this type of hermetic electric compressor requires high torque when compressing the refrigerant, the core width of the electric motor is increased to produce high torque, and the rotor part has a strong magnetic force in the rare earth magnet. Had to be used. However, recently, due to the difficulty of obtaining rare earths used in rare earth magnets and soaring materials such as copper and iron, improvement in compressor performance and increase in production costs have been issues.
In addition, with the recent diversification of hermetic electric compressors, there has been a demand for smaller size and lighter weight. With this, the motor needs to be smaller and lighter, but the generated torque is greatly reduced. There was a problem of ending up.

  Furthermore, refrigerating machine oil is stored at the bottom of the hermetic container as lubricating oil for lubricating each sliding portion of the rotary compression mechanism. For this reason, when the rotary compression mechanism portion is disposed at the lower portion, the lubricating oil stored in the bottom portion of the sealed container is raised along the inner diameter of the crankshaft by the centrifugal force caused by the rotation of the crankshaft, and is provided on the crankshaft. Lubricating oil was supplied to the sliding part of the compression mechanism part via the oil supply hole. Lubricating oil is supplied from the respective oil supply holes to the main shaft, the main bearing, the main shaft side eccentric portion and the piston, and the sliding portion between the sub shaft and the sub bearing.

  On the other hand, in the case of a scroll type compressor in which the rotary compression mechanism is arranged at the top in the closed container, the refrigerating machine oil staying at the bottom in the closed container becomes a high pressure in the closed container due to the compression work, and the intermediate pressure It is sucked into the oil supply hole penetrating the motor shaft core due to the differential pressure with the chamber, and guided to the oil supply hole provided in the main shaft and the intermediate pressure chamber.

  In a compressor provided with a transmission such as a planetary gear mechanism in the middle of the configuration in which the motor portion is arranged in the upper portion and the compression mechanism portion in the lower portion in the sealed container, the oil supply property is ensured between the clutch mechanism portions. A form (Patent Document 1) having a supply connecting pipe is known.

  Therefore, without increasing the core width of the electric motor or using an electric motor having a rare earth magnet with strong magnetic force, a continuously variable transmission or a planetary gear mechanism or a predetermined reduction gear is provided between the electric motor and the compression mechanism. The invention which produces high torque is disclosed (for example, refer patent documents 1 and 2).

In addition, as an electric motor used for a single rotary compressor of one cylinder, a balance adjusting balancer is installed on the top and bottom of the rotor in order to adjust the unbalance caused by one eccentric part provided in the rotary shaft constituting the rotary compression mechanism. I have. In a two-cylinder twin rotary compressor, the two eccentric portions provided on the rotating shaft are positioned opposite to each other and are balanced, so that a balance adjusting balancer may not be attached to the rotor.
And in order to make the balancer for balance adjustment unnecessary, the invention which uses a balance adjustment hole in the core part of a rotor is indicated (for example, refer to patent documents 3).

  Furthermore, since the motor part and the rotary compression mechanism part are housed in a sealed container, using a DC motor (brushless DC motor) is more difficult than an AC motor (induction motor) due to electromagnetic noise generated when the stator is energized. Noise tends to increase. As one countermeasure against the noise, the electric motor part and the rotary compression mechanism part are housed in a cylinder in a sealed container to form a double structure.

As a structure in which the electric motor part and the rotary compression mechanism part are accommodated in the container in a double structure, the inner cylinder covering the compression mechanism part and the electric motor part is connected to the outer cylinder by a connecting member, and the compression mechanism is connected to the inner cylinder. An invention is disclosed in which a stator is fixed and a drive shaft is rotatably supported by a bearing member at a lower end portion of an inner cylinder (see, for example, Patent Document 4).
Alternatively, an invention is disclosed in which a cylindrical tube has its lower end abutted against the upper surface of the cylinder, and the inner wall of the lower portion is fixed to the outer peripheral portion of the upper bearing by spot welding (for example, see Patent Document 5).

Japanese Utility Model Publication No. 63-036670 (page 3-4, FIG. 1) Japanese Patent Laying-Open No. 2005-075252 (page 5-6, FIG. 1) JP 2008-178233 A (page 5-6, FIG. 2) Japanese Patent Laid-Open No. 2002-242872 (page 3-4, FIG. 1) Japanese Patent Laying-Open No. 2005-248844 (page 3-4, FIG. 1)

(A) In the hermetic electric compressor described in Patent Document 1, a clutch mechanism is used for power transmission in a structure having a continuously variable transmission in the middle part, but a structure using a transmission ring or a pressure adjusting cylinder. Since the pressure adjusting cylinder is held on one side, there is a problem that assembly is difficult.
In addition, the refrigerating machine oil as lubricating oil which lubricates each sliding part of a rotation compression mechanism part is stored in the bottom part of an airtight container. For this reason, when the rotary compression mechanism portion is disposed at the lower portion, the lubricating oil stored in the bottom portion of the sealed container is raised along the inner diameter of the crankshaft by the centrifugal force caused by the rotation of the crankshaft, and is provided on the crankshaft. Lubricating oil was supplied to the sliding part of the compression mechanism part via the oil supply hole. Lubricating oil is supplied from the respective oil supply holes to the main shaft, the main bearing, the main shaft side eccentric portion and the piston, and the sliding portion between the sub shaft and the sub bearing.
On the other hand, in the case of a scroll type compressor in which the rotary compression mechanism is arranged at the top in the closed container, the refrigerating machine oil staying at the bottom in the closed container becomes a high pressure in the closed container due to the compression work, and the intermediate pressure It is sucked into the oil supply hole penetrating the motor shaft core due to the differential pressure with the chamber, and guided to the oil supply hole provided in the main shaft and the intermediate pressure chamber.
Therefore, in the middle of the configuration in which the electric motor portion is arranged in the upper portion and the compression mechanism portion in the lower portion in the sealed container, the form that ensures oil supply in a compressor having a transmission such as a planetary gear mechanism is provided between the clutch mechanism parts. Has an oil supply connecting pipe. At this time, a ball is arranged between the automatic pressure adjusting cam and the cam cylinder to ensure oil supply between the clutches, but when the contact pressure of the clutch works strongly, the refrigeration oil staying at the bottom of the compressor is sucked up. There was a problem that the balance with the hydraulic pressure was lost, the oil flow path was closed, and the oil supply performance was significantly deteriorated.

  (B) In the hermetic electric compressor described in Patent Document 2, the compressor is a horizontal type, and the rotary compression mechanism is supplied with a vane pumping action, and the rotary compression mechanism is not supplied with oil. However, there has been a problem in long-term reliability such as the occurrence of gear engagement due to insufficient lubrication of the planetary gear mechanism.

  (C) In the hermetic electric compressor described in Patent Document 3, various types of cylinder widths and eccentricity compressors are prepared for each of the electromagnetic steel plate molds that constitute the balancer-free rotor. There is a problem that the production and management costs increase.

  (D) In the hermetic electric compressor described in Patent Document 4, the inner cylinder tube covers the rotary compression mechanism unit to the electric motor unit. However, the cost of the inner cylinder tube is increased and the material used is increased. There was a problem of increase in weight and weight.

  (E) In the hermetic electric compressor described in Patent Document 5, the bearing of the rotary compression mechanism and the motor are integrated, and the inner tube is attached to the bearing by spot welding. In the spot welding, there is a problem that the bearing is distorted by heating and the performance is deteriorated due to the pressure loss due to refrigerant leakage during the rotary compression.

  The present invention has been made to solve the above problems, and even when a miniaturized electric motor is used, it can generate a torque equivalent to the conventional one, and is low in cost, easy to assemble, Another object of the present invention is to provide a hermetic electric compressor that ensures oil supply.

A hermetic electric compressor according to the present invention is a sealed container having a refrigerant suction port and a discharge port, a compression mechanism unit that is installed in the sealed container, and compresses the refrigerant, and is installed in the sealed container. A DC motor unit that drives the compression mechanism unit, and a motor shaft of the DC motor unit and a drive shaft of the compression mechanism unit are connected by a planetary gear mechanism unit, and the planetary gear mechanism unit includes: A sun gear installed on the motor shaft; a planetary gear that rotates and revolves by meshing with the sun gear; an internal gear that meshes with the planetary gear; and a drive gear that rotatably supports the planetary gear. A gear shaft that revolves together with the planetary gear , a convex portion or a concave portion is formed at the end portion of the gear shaft, and a concave portion or a convex portion that fits into the convex portion or concave portion of the gear shaft at the end portion of the drive shaft. A portion of the gear shaft Fitting between the recess of the drive shaft parts, or by fitting the convex portion of the concave portion and the drive shaft of the gear shaft, characterized in that said drive shaft and said gear shaft is connected.

The hermetic electric compressor according to the present invention reduces the rotational speed of the motor shaft on the input side (decelerates) by the planetary gear mechanism and transmits it to the drive shaft on the output side. Even if a miniaturized electric motor is used, the compression mechanism section is operated at an appropriate (low) rotational speed, and a necessary torque can be extracted.
Therefore, due to the recent rise in materials such as copper and iron, which are difficult to obtain rare earths, the improvement in compressor performance and production cost have become issues, and compression due to the recent diversification of compressors The size of the compressor is reduced due to the downsizing and weight reduction of the machine, and the generated torque is greatly reduced because the motor needs to be downsized. Torque can be generated.

BRIEF DESCRIPTION OF THE DRAWINGS The longitudinal cross-sectional view explaining the hermetic type electric compressor which concerns on Embodiment 1 of this invention, and the top view which shows a part. The longitudinal cross-sectional view explaining the sealed electric compressor which concerns on Embodiment 2 of this invention. The longitudinal cross-sectional view explaining the hermetic electric compressor which concerns on Embodiment 3 of this invention, and the top view which shows a part. The longitudinal cross-sectional view explaining the sealed electric compressor which concerns on Embodiment 4 of this invention, and the top view which shows a part. The longitudinal cross-sectional view explaining the sealed electric compressor which concerns on Embodiment 5 of this invention. The longitudinal cross-sectional view explaining the hermetic electric compressor which concerns on Embodiment 6 of this invention.

[Embodiment 1]
1A and 1B schematically illustrate a hermetic electric compressor according to Embodiment 1 of the present invention, in which FIG. 1A is a longitudinal sectional view and FIG. 1B is a plan view showing a part thereof. In addition, each figure is drawn typically and this invention is not limited to the form shown in figure.

(Single rotary compressor)
In FIG. 1A, a hermetic electric compressor (hereinafter referred to as “single rotary compressor”) 100 includes a hermetic container 1, an electric motor unit 2 fixed to the upper part of the hermetic container 1, and a planetary gear mechanism. Part 3 and compression mechanism part 4, and lubricating oil for lubricating the compression mechanism part 4 is sealed in the bottom of the sealed container 1. A discharge pipe 6 is inserted into the top of the sealed container 1.
The electric motor unit 2 includes a stator 2a and a rotor 2b. A motor shaft 7 is fitted into the rotor 2b, and the rotation of the rotor 2b is transmitted to the planetary gear mechanism unit 3 through the motor shaft 7. A disc-shaped oil separation plate 8 having an outer diameter smaller than the outer diameter of the rotor 2b is held at the upper end of the motor shaft 7, and rotates together with the rotor 2b.
A suction muffler 9 is installed outside the sealed container 1, and the suction muffler 9 is connected to the compression mechanism 4 in the sealed container 1 by a suction pipe 10.

(Planetary gear mechanism)
In FIG. 1 (b), the planetary gear mechanism 3 is disposed around the sun gear 3a and the sun gear 3a having external teeth attached to the motor shaft 7 on the input side, and meshes with the sun gear 3a. The planetary gear 3b having external teeth that rotate and revolve, the inner gear 3c that is arranged outside the planetary gear 3b and meshes with the planetary gear 3b, and the planetary gear 3b are equiangularly arranged in the circumferential direction and the planetary gear. A gear shaft 3d that rotatably supports 3b and revolves similarly to the planetary gear 3b. The gear shaft 3d is connected to a drive shaft (hereinafter sometimes referred to as “crankshaft”) 11.
At this time, the sun gear 3a is formed with a total of two small punched holes 3x at the diagonal position, and the planetary gear 3b is formed with a total of two small cast holes 3y at the diagonal position, and the internal gear 3c. A total of eight small punching holes 3z arranged equiangularly in the circumferential direction are formed in the motor shaft 7, and an oil supply hole (not shown) is provided in the motor shaft 7. For this reason, the oil supply property to the planetary gear mechanism 3 is improved. That is, since the area and quantity of the punched holes are reduced as compared with the conventional case, the rising of the refrigerating machine oil from the discharge pipe 6 into the refrigerant circuit is reduced.
In FIG. 1C, a convex portion 3e having a rectangular cross section is formed on the end surface of the gear shaft 3d, and an oil supply hole 3f is provided on the shaft core of the gear shaft 3d and the convex portion 3e. On the other hand, a concave portion 11 a into which the convex portion 3 e can be fitted is formed on the end surface of the drive shaft 11, and an oil supply hole 11 b is provided in the shaft core of the drive shaft 11. Therefore, the gear shaft 3d and the drive shaft 11 can be connected with one touch only by fitting the convex portion 3e to the concave portion 11a, so that the assemblability is improved. Moreover, oil supply property is not impaired by providing the oil supply hole 3f and the oil supply hole 11b. In addition, the cross-sectional shape of the convex part 3e and the recessed part 11a is not limited, For example, a hexagon and a serration etc. may be sufficient, a recessed part is formed in the gear shaft 3d, and the recessed part is formed in the drive shaft 11 at this recessed part. You may form the convex part to fit.

(Compression mechanism)
The compression mechanism unit 4 is in the form of a so-called rotary compressor.
That is, the compression mechanism part 4 has a cylinder 12 and an eccentric part, and is connected by fitting the concave part 11a to the convex part 3e formed on the gear shaft 3d (see (c) in FIG. 1). A crankshaft (same as the drive shaft) 11 having an eccentric shaft, and a rolling piston 15 that is rotatably inserted into the eccentric shaft and revolves in the cylinder 12 by the rotation of the crankshaft 11 are provided. Then, the bearing 12 into which the crankshaft 11 is rotatably inserted, the upper and lower bearings 13 and 14 having end plates closing the upper and lower sides of the cylinder 12, and the cylinder 12 with one end in contact with the outer diameter of the rolling piston 15. A plate-like vane (not shown) that reciprocates in a groove provided in the shaft, and an eccentric portion of the crankshaft 11 and a balancer 16 for balance adjustment are provided on the upper portion of the drive shaft 11.

(Operation)
First, the refrigerant outside the sealed container 1 in the refrigerant circuit (not shown) constituting the refrigeration cycle is sucked into the sealed container 1. The low-pressure refrigerant passes through the suction muffler 9 from the suction pipe 9a, is sucked into the sealed container 1, and the low-pressure refrigerant gas sucked into the compression chamber (not shown) in the cylinder 12 is sent by the cylinder 12. A refrigerant circuit (outside the hermetic container 1) that passes through the first discharge muffler 17 from the discharge port (not shown) provided in the bearing 13 by being compressed by the configured compression mechanism 4, via the discharge pipe 6. (Not shown).

  Lubricating oil for lubricating the planetary gear mechanism 3 and the compression mechanism 4 is sealed at the bottom of the sealed container 1, and a spiral pump blade 18 is formed in a hollow portion formed in the shaft core of the drive shaft 11. Is inserted and fixed. Therefore, the lubricating oil is sucked by the centrifugal pump action generated by the rotation of the drive shaft 11, and the sliding portions of the bearings 13 and 14 and the planetary gear mechanism portion 3 are moved through the oil supply holes of the drive shaft 11 and the motor shaft 7. Refuel.

(Function and effect)
Since the single rotary compressor 100 has the above-described configuration, the rotational speed of the output-side drive shaft 11 can be made smaller than the rotational speed of the input-side motor shaft 7. Therefore, even if a low-torque, high-rotation type miniaturized electric motor is used, the planetary gear mechanism unit 3 is operated at an appropriate (low) rotational speed by the planetary gear mechanism unit 3, and necessary torque can be extracted.
In addition, with respect to the oil supply property, according to the present embodiment, the shaft core of the drive shaft 11 and the shaft core of the motor shaft 7 are made hollow so that oil is supplied to the bearings 13 and 14 and the planetary gear mechanism unit 3. Oil can be supplied to the moving part and the rolling part (including the planetary gear mechanism part 3).
As for the assembly property, since the coupling is performed by fitting the convex portion 3e of the gear shaft 3d and the concave portion 11a of the drive shaft 11, the assembly is facilitated and the productivity is improved.

[Embodiment 2]
FIG. 2 is a longitudinal sectional view schematically illustrating a hermetic electric compressor according to Embodiment 2 of the present invention. In addition, the same code | symbol is attached | subjected to the part which is the same as that of Embodiment 1, or an equivalent part, and one part description is abbreviate | omitted.

(Twin rotary compressor)
In FIG. 2, a hermetic electric compressor (hereinafter referred to as “twin rotary compressor”) 200 has the planetary gear mechanism 3 described in the first embodiment.
That is, in the twin rotary compressor 200, the motor part 2, the planetary gear mechanism part 3, and the compression mechanism part 20 are fixed to the upper part of the sealed container 1, and the compression mechanism part 20 is lubricated to the bottom of the sealed container 1. Of lubricating oil is enclosed.

(Compression mechanism)
The compression mechanism unit 20 is in the form of a so-called rotary compressor.
That is, the compression mechanism unit 20 is connected to the first cylinder 21 and the second cylinder 22 partitioned by the intermediate partition plate 27, the drive shaft 25, and has a crankshaft 26 having an eccentric shaft, and is rotatable about the eccentric shaft. A first rolling piston 23 and a second rolling piston 24 that are inserted and rotated in the first cylinder 21 and the second cylinder 22 by the rotation of the crankshaft 26 are provided.
A plate-like first vane that reciprocates in grooves provided in the first cylinder 21 and the second cylinder 22 with one end in contact with the outer diameter of each of the first rolling piston 23 and the second rolling piston 24, and A second vane (not shown), a bearing 13 into which the crankshaft 11 is rotatably inserted, and upper and lower bearings 13 and 14 having end plates closing the upper and lower sides of the first cylinder 21 and the second cylinder 22; It has.
The balancer 16 that has been installed in the single rotary compressor 100 described in the first embodiment is not installed in the twin rotary compressor 200.

(Operation)
The twin rotary compressor 200 includes a compression mechanism unit 20 that is driven by the motor shaft 7 of the electric motor unit 2 and has a pair of eccentric portions whose eccentric directions are shifted from each other by 180 ° (same as diagonal positions). That is, the compression mechanism unit 20 is provided with a pair of first cylinders 21 and second cylinders 22 on both upper and lower sides with the intermediate partition plate 27 interposed therebetween.
The first cylinder 21 and the second cylinder 22 are internally provided with a first rolling piston 23 and a second rolling piston 24 fitted to the eccentric part (not shown), and the first cylinder 21 and the second cylinder The bearings 13 and 14 are disposed on the upper and lower portions of the motor 22, and the discharge mufflers 17 and 19 are attached to the bearings 13 and 14, respectively.
Further, the first rolling piston 23 and the second rolling piston 24 are rotated within the first cylinder 21 and the second cylinder 22 with a phase difference of 180 degrees, and the discharge ports (not shown) provided in the bearings 13 and 14 are changed to the first. Inside the first discharge muffler 17 and the second discharge muffler 19, the discharge gas is released with a phase difference of 180 °, the compression load applied to one rotation of the drive shaft 25 is dispersed, and the load torque of the electric motor unit 2 is averaged. I am doing so.

(Function and effect)
Similar to the single rotary compressor 100 described in the first embodiment, the twin rotary compressor 200 has the planetary gear mechanism unit 3, and therefore, the output side drive with respect to the rotational speed of the input side motor shaft 7. It becomes possible to make the rotation speed of the axis | shaft 25 small. Therefore, even if the motor unit 2 with a small torque and a high rotation type is used, the compression mechanism unit 20 is operated at an appropriate rotational speed, and a necessary torque can be extracted.
As for the oil supply property, like the single rotary compressor 100, the shaft core of the drive shaft 25 and the shaft core of the motor shaft 7 are made hollow so that the bearings 13 and 14 and the planetary gear mechanism 3 are supplied with oil. Thus, oil can be supplied to each sliding portion and rolling portion (including the planetary gear mechanism portion 3).

Further, in the twin rotary compressor 200, since the eccentric portion is balanced, the balance adjusting balancer 16 like the single rotary compressor 100 can be dispensed with, and the cost can be reduced by reducing the number of parts. And assembly can be improved.
In other words, in the two-cylinder twin rotary compressor 200, the two eccentric portions provided on the rotating shaft are positioned opposite to each other and balanced, so that a balancer is not necessary. In addition, the balance adjustment balancer is not attached to the drive shaft of the compression mechanism, and the balance adjustment hole is not provided in the rotor core, eliminating the need for mold creation and management costs. Can be realized.

[Embodiment 3]
3A and 3B schematically illustrate a hermetic electric compressor according to Embodiment 3 of the present invention, in which FIG. 3A is a longitudinal sectional view and FIG. 3B is a plan view showing a part thereof. In addition, the same code | symbol is attached | subjected to the part which is the same as that of Embodiment 1, or an equivalent part, and one part description is abbreviate | omitted.

(Scroll compressor)
3A, the hermetic electric compressor (hereinafter referred to as “high-pressure shell type frame compliant scroll compressor”) or “scroll compressor” 300 is the planetary gear mechanism described in the first embodiment. Part 3.
In FIG. 3, the scroll compressor 300 has a compression mechanism unit 50 arranged at the upper part of the hermetic container 1 and an electric motor unit 2 arranged at the lower part.
The compression mechanism unit 50 forms a compression chamber 51 d by a fixed scroll 51 fixed to the inner periphery of the hermetic container 1 and an orbiting scroll 52 connected to the motor shaft 7.
The fixed scroll 51 is formed with spiral (scroll curve) -like plate-like spiral teeth 51 b, while the upper surface of the base plate portion 52 a of the orbiting scroll 52 is substantially the same as the plate-like spiral teeth 51 b of the fixed scroll 51. Plate-shaped spiral teeth 52b having the same shape are provided. The former plate-like spiral teeth 51b and the latter plate-like spiral teeth 52b geometrically form a compression chamber 51d.

Further, a hollow cylindrical boss portion 52f is formed at the center of the surface of the base plate portion 52a opposite to the plate-like spiral teeth 52b, and the swing shaft 54a at the upper end of the main shaft 54a is freely rotatable on the boss portion 52f. Is engaged.
Further, a thrust surface 52d that can slide in pressure contact with the thrust bearing 53a of the compliant frame 53 is formed on the surface of the base plate portion 52a opposite to the plate-like spiral teeth 52b.
An Oldham guide groove 52e having a phase difference of 90 degrees with the Oldham guide groove 51c of the fixed scroll 51 is formed on the outer peripheral portion of the base plate portion 52a of the orbiting scroll 52 at substantially two positions, and the Oldham guide groove 52e. The claw 59a of the Oldham ring 59 is engaged with the reciprocating slide.
Further, the base plate portion 52a is provided with an orbiting scroll extraction hole 52j that penetrates the compression chamber 51d and the thrust surface 52d, and has a structure that extracts refrigerant gas during compression and guides it to the thrust surface 52d.

The compliant frame 53 has two upper and lower cylindrical surfaces 53d and 53e provided on the outer peripheral portion thereof supported in a radial direction by cylindrical surfaces 65a and 65b provided on the inner peripheral portion of the guide frame 65. Are formed with a main bearing 53c and a sub main bearing 53h that support the main shaft 54 that is rotationally driven by the stator 2a in the radial direction.
Further, a communication passage 53s penetrating in the axial direction from the surface of the thrust bearing 53a is provided, and the thrust bearing side opening 52k of the communication passage 53s is arranged to face the swing scroll extraction hole 52j.

The outer peripheral surface 65g of the guide frame 65 is fixed to the sealed container 1 by shrink fitting or welding, but a notch 65c (a gap is formed between the outer peripheral container 1 and the sealed container 1 or welded). In other words, a flow path for guiding the high-pressure refrigerant gas discharged from the discharge port 51e of the fixed scroll 51 to the discharge pipe 6 provided between the compression mechanism unit 50 and the electric motor unit 2 is secured.
Further, the notch 65c is provided at a position opposite to the discharge pipe 6 (same as a diagonal position different by 180 °).
Further, on the inner peripheral surface of the guide frame 65, cylindrical surfaces 65a and 65b that engage with the cylindrical surfaces 53d and 53e formed on the outer peripheral surface of the compliant frame 53, and the upper seal material 66a and the lower seal material 66b are provided. Two sealing grooves are provided.
The frame space 65f formed by the inner peripheral surface of the guide frame 65 and the outer peripheral surface of the compliant frame 53 sealed with the upper seal material 66a and the lower seal material 66b is only the communication passage 53s of the compliant frame 53. The refrigerant gas that is in the middle of compression supplied from the swing scroll extraction hole 52j is sealed.

At the upper end of the main shaft 54, an oscillating shaft 54a that is rotatably engaged with the oscillating bearing 52c of the oscillating scroll 52 is formed, and a main shaft balancer 54e is shrink fitted on the lower side of the oscillating shaft 54a. . Further, a main shaft portion 54c is formed under the main shaft balancer 54e, and the main shaft portion 54c is rotatably engaged with the main bearing 53c and the sub main bearing 53h of the compliant frame 53.
Further, the planetary gear mechanism unit 3 (including the sun gear 3a, the planetary gear 3b, the internal gear 3c, and the gear shaft 3d) is installed at a position below the upper auxiliary bearing 70 of the main shaft 54 and above the motor unit 2. Has been. That is, the sun gear 3 a is fixed to the lower portion of the main shaft 54, the upper portion of the motor shaft 7 is connected to the lower portion of the main shaft 54, and the rotor 2 b is inserted into the central range of the motor shaft 7. The countershaft part 7b is formed in. The sub shaft portion 7b is rotatably engaged with the sub bearing 56a of the sub frame 56.

Further, an oil pipe 7c is press-fitted into the lower end of the hollow motor shaft 7 so as to suck up refrigeration oil (not shown) staying at the bottom of the sealed container 1.
At this time, the sun gear 3a, the planetary gear 3b, and the internal gear 3c are respectively formed with punched holes 3x, 3y, and 3z, and the upper auxiliary bearing 70 has a total of two small cast holes 70x at diagonal positions. Is formed (see FIG. 3B), and the motor shaft 7 is provided with an oil supply hole. For this reason, the oil supply property to the planetary gear mechanism 3 is improved. That is, since the area and quantity of the punched holes are reduced as compared with the conventional case, the rising of the refrigerating machine oil from the discharge pipe 6 into the refrigerant circuit is reduced.

(basic action)
Next, the basic operation of the scroll compressor 300 will be described.
During the operation of the scroll compressor 300, the suction refrigerant is sucked from the suction pipe 10, and the suction refrigerant enters a compression chamber 51 d formed by the plate-like spiral teeth 51 b of the fixed scroll 51 and the plate-like spiral teeth 52 b of the swing scroll 52. enter.
The orbiting scroll 52 driven by the stator 2a reduces the volume of the compression chamber 51d with the eccentric turning motion.
Due to this compression stroke, the suction refrigerant becomes high pressure and is discharged into the sealed container 1 from the discharge port 51 e of the fixed scroll 51. In the compression stroke, the intermediate-pressure refrigerant gas in the middle of compression is led to the frame space 65f through the communication passage 53s of the compliant frame 53 from the swing scroll extraction hole 52j of the swing scroll 52, and is intermediate between the frame space 65f. Maintain pressure atmosphere.
The high-pressure discharge gas fills the sealed container 1 with a high-pressure atmosphere and is discharged (guided) from the discharge pipe 6 to the outside of the sealed container 1.

The refrigerating machine oil stored in the sump 1a at the bottom of the hermetic container 1 passes through the oil supply hole 7a penetrating the motor shaft 7 in the axial direction due to the differential pressure, and further passes through the oil supply hole penetrating the main shaft 54 to the rocking bearing space. 54b.
The refrigerating machine oil that has become an intermediate pressure by the squeezing action of the rocking bearing 52c fills the boss space 52h surrounded by the rocking scroll 52 and the compliant frame 53, and pressure that connects the boss space 52h and the low-pressure atmosphere space. It is guided to a low pressure space via a regulating valve (not shown) and is sucked into the compression chamber 51d together with a low pressure refrigerant gas.
The refrigerating machine oil becomes high-pressure refrigerant gas by the compression stroke, and is discharged into the sealed container 1 from the discharge port 51e.

(Function and effect)
Since the scroll compressor 300 includes the planetary gear mechanism 3 as in the single rotary compressor 100 and the twin rotary compressor 200 shown in the first and second embodiments, the rotation of the motor shaft 7 on the input side is rotated by the mechanism. It is possible to reduce the rotational speed of the main shaft 54 on the output side that is coaxial with respect to the number. Therefore, even if the low-torque and high-rotation type motor unit 2 is used in a small size, the planetary gear mechanism unit 3 can be operated at an appropriate rotational speed by the compressor, and necessary torque can be extracted.
As for the oil supply property, also in the present embodiment having the compression mechanism portion 50 in the upper portion, the shaft core of the main shaft 54 and the shaft core of the motor shaft 7 are made hollow, and bearing portions such as the swing bearing 52c and the sub main bearing 53h Since the oil supply hole is provided so that the planetary gear mechanism 3 is supplied with oil, the inside of the hermetic container 1 becomes high pressure when performing compression work, and is led to the oil supply pipe that penetrates the motor shaft core by the differential pressure with the intermediate pressure chamber. In addition, each sliding part and the planetary gear mechanism part can be oiled.

That is, since the structure is such that the refrigerating machine oil stays at the bottom in the sealed container 1, the compression mechanism portion 4 is located at the lower portion, so that the pump blades provided on the shaft core of the drive shaft 11 act to the compression mechanism portion 4. The oil seal effect makes it possible to stabilize the sealing performance of the compression mechanism 4, and the lubrication effect reduces wear on the sliding parts such as the drive shaft 11 and the sliding bearings 13 and 14 and shaft galling. I can do it.
Further, the refrigerating machine oil staying at the bottom in the sealed container 1 is compressed to perform high pressure in the sealed container 1 due to the compression work and penetrates the shaft core of the motor shaft 7 due to the differential pressure with the intermediate pressure chamber. Since it is sucked into the pipe and guided to an oil supply hole or an intermediate pressure chamber provided in the drive shaft 11, an intermediate for differential pressure oil supply is provided even when the compression mechanism 4 is provided in the upper part of the sealed container 1. By having the pressure chamber and the oil supply pipe, it becomes easy to supply oil to the compression mechanism unit 4, the sealing performance of the compression mechanism unit 4 is stabilized by the sealing effect of the oil, and the drive shaft and the sliding bearing are provided by the lubrication effect. Wear of the sliding part and shaft galling can be reduced.

[Embodiment 4]
4A and 4B schematically illustrate a hermetic electric compressor according to Embodiment 4 of the present invention. FIG. 4A is a longitudinal sectional view, and FIG. 4B is a plan view showing a part thereof. In addition, the same code | symbol is attached | subjected to the part which is the same as that of Embodiment 1, or an equivalent part, and one part description is abbreviate | omitted.

(Inner cylinder type single rotary compressor)
4A, a hermetic electric compressor (hereinafter referred to as “inner cylinder single rotary compressor”) 400 includes the planetary gear mechanism 3 described in the first embodiment.
The motor bearing 32, the electric motor unit 2, and the planetary gear mechanism unit 3 include these, and are fixed and integrated with an inner tube 31 having a fixing unit 33 on the side surface of the end. The inner tube 31 is fixed to the cylinder 12 with a bolt 34 by a fixing portion 33 (a nut screwed into the bolt 34 is not shown), and is provided at the upper part inside the sealed container 1.
In other words, the motor unit 2 and the planetary gear mechanism unit 3 are directly attached to the sealed container 1 in that the motor unit 2 and the planetary gear mechanism unit 3 are indirectly fixed to the sealed container 1. This is different from the single rotary compressor 100 shown in the first embodiment, which is fixed by shrink fitting, welding or the like, and is the same as the single rotary compressor 100 in other points.

(Function and effect)
Since the inner cylindrical single rotary compressor 400 includes the planetary gear mechanism 3, even if the low-torque and high-rotation type motor unit 2 is operated at high speed, as with the single rotary compressor 100, The planetary gear mechanism 3 is operated at an appropriate rotational speed by the compressor, and a necessary torque can be extracted.
Further, since the inner tube 31 that integrates the electric motor unit 2 and the planetary gear mechanism unit 3 is fixed to the cylinder 12 by the fixing unit 33, the bearing can be assembled without being distorted, and performance degradation is prevented. be able to.
Moreover, since the inner cylinder pipe 31 which integrates the electric motor part 2 and the planetary gear mechanism part 3 is fixed with the airtight container 1 by the fixing | fixed part 33, the inner cylinder single rotary compression by the whirling of the inner cylinder pipe 31 at the time of driving | operation is carried out. Vibration during operation of the machine 400 main body can be suppressed.

Further, regarding the oil supply property, like the single rotary compressor 100 and the twin rotary compressor 200 shown in the first and second embodiments, the shaft core of the drive shaft 11 and the shaft shaft of the motor shaft 7 are made hollow, and the bearings 13, 14 are used. Further, by providing the oil supply holes so that the oil is supplied to the planetary gear mechanism, the oil supply performance of the sliding parts and the planetary gear mechanism 3 can be improved.
At this time, cast holes 3x, 3y, and 3z are formed in the sun gear 3a, the planetary gear 3b, and the internal gear 3c, respectively, and an oil supply hole is provided in the motor shaft 7. For this reason, the oil supply property to the planetary gear mechanism 3 is improved. That is, since the area and quantity of the punched holes are reduced as compared with the conventional case, the rising of the refrigerating machine oil from the discharge pipe 6 into the refrigerant circuit is reduced.

[Embodiment 5]
FIG. 5 is a longitudinal sectional view schematically illustrating a hermetic electric compressor according to Embodiment 5 of the present invention. In addition, the same code | symbol is attached | subjected to the part which is the same as that of Embodiment 2, 4, or an equivalent, and one part description is abbreviate | omitted.

(Inner cylinder twin rotary compressor)
In FIG. 5, a hermetic electric compressor (hereinafter referred to as “inner cylinder twin rotary compressor”) 500 is the same as the inner rotary single compressor shown in the fourth embodiment in the twin rotary compressor 200 shown in the second embodiment. According to the rotary compressor 400, the motor bearing 32, the electric motor unit 2, and the planetary gear mechanism unit 3 include these, and are fixed to the inner tube 31 having a fixing portion 33 on the side surface of the end portion thereof. The inner tube 31 is fixed to the first cylinder 21 with a bolt 34 by a fixing portion 33 and is disposed at the upper part inside the sealed container 1.

(Function and effect)
Since the inner cylindrical twin rotary compressor 500 includes the planetary gear mechanism 3, even if the low-torque, high-rotation type miniaturized electric motor unit 2 is operated at high speed, the planetary gear mechanism 3 can operate as a compressor. The required torque can be extracted by operating at an appropriate rotation speed.
Further, similarly to the inner cylindrical single rotary compressor 400 shown in the fourth embodiment, according to this embodiment, the motor bearing 32, the electric motor unit 2, and the planetary gear mechanism unit 3 are fixed and integrated with the inner cylindrical pipe 31. As a result, the assemblability is improved, and the inner cylinder tube 31 is shortened, so that the cost can be reduced.
In addition, since the inner tube 31 that integrates the electric motor unit 2 and the planetary gear mechanism unit 3 is fixed to the first cylinder 21 by the fixing unit 33, the bearing can be assembled without being distorted, resulting in performance degradation. Can be prevented.

In addition, as for the oil supply performance, like the single rotary compressor 100, twin rotary compressor 200, and inner cylindrical single rotary compressor 400 shown in the first, second, and fourth embodiments, the drive shaft 25 axis and the motor shaft 7 are provided. By hollowing the shaft core, arranging oil supply holes so as to be supplied to the bearings 13 and 14 and the planetary gear mechanism 3, and further reducing the area and the number of the cast holes formed in each member ( The oil supply property to each sliding part and the planetary gear mechanism part is improved.
Further, like the twin rotary compressor 200 shown in the second embodiment, since the eccentric portion is balanced 34, the balancer 16 for balance adjustment can be eliminated, the number of parts is reduced, and the cost is reduced. And ease of assembly can be achieved.

[Embodiment 6]
FIG. 6 is a longitudinal sectional view schematically illustrating a hermetic electric compressor according to Embodiment 6 of the present invention. In addition, the same code | symbol is attached | subjected to the part which is the same as that of Embodiment 3 and 4, or an equivalent part, and one part description is abbreviate | omitted.

(Inner cylinder type scroll compressor)
In FIG. 6, a hermetic electric compressor (hereinafter referred to as “inner cylinder scroll compressor”) 600 is the same as the inner cylinder single rotary compression shown in the fourth embodiment in the scroll compressor 300 shown in the third embodiment. In accordance with the machine 400, the motor bearing 32, the electric motor unit 2, and the planetary gear mechanism unit 3 include these, and are fixed and integrated with the inner tube 31 having a fixing portion 33 on the side surface of the end portion. The inner tube 31 is fixed to the upper auxiliary bearing 70 with a bolt 34 by a fixing portion 33, and is arranged at the upper part inside the sealed container 1.

(Function and effect)
Since the inner cylinder type scroll compressor 600 includes the planetary gear mechanism unit 3, the planetary gear mechanism unit 3 allows the compressor to rotate at an appropriate rotational speed even when the low-torque and high-rotation type motor unit 2 is used. The required torque can be extracted.
Further, the electric motor unit 2 and the planetary gear mechanism unit 3 are fixed and integrated with the inner cylindrical tube 31, and the fixing unit 33 is fixed to the upper auxiliary bearing 70, whereby the inner cylindrical single rotary shown in the fourth embodiment. As with the compressor 400, improvement of assembling and cost reduction are promoted.

  1: closed container, 2: motor part, 2a: stator, 2b: rotor, 3: planetary gear mechanism part, 3a: sun gear, 3b: planetary gear, 3c: internal gear, 3d: gear shaft, 3e: convex part, 3f: oil supply hole, 3x: cast hole, 3y: cast hole, 3z: cast hole, 4: compression mechanism, 6: discharge pipe, 7: motor shaft, 7a: oil supply hole, 7b: countershaft 7c: oil pipe, 8: oil separation plate, 9: suction muffler, 9a: suction pipe, 10: suction pipe, 11: drive shaft (crankshaft), 11a: recess, 11b: oil supply hole, 12: cylinder, 13: Bearing: 14: Bearing, 15: Rolling piston, 16: Balancer, 17: First discharge muffler, 18: Pump blade, 19: Second discharge muffler, 20: Compression mechanism, 21: First cylinder, 22: First 2 cylinders, 23: first rolling piston, 24: first Rolling piston, 25: Drive shaft, 26: Crankshaft, 27: Intermediate partition plate, 31: Inner tube, 32: Motor bearing, 32x: Cast hole, 33: Fixed part, 34: Bolt, 50: Compression mechanism part , 51: fixed scroll, 51b: plate-like spiral teeth, 51c: Oldham guide groove, 51d: compression chamber, 51e: discharge port, 52: swing scroll, 52a: base plate portion, 52b: plate-like spiral teeth, 52c: Oscillating bearing, 52d: thrust surface, 52e: Oldham guide groove, 52f: boss portion, 52h: boss portion space, 52j: oscillating scroll extraction hole, 52k: thrust bearing side opening, 53: compliant frame, 53a: Thrust bearing, 53c: main bearing, 53d: cylindrical surface, 53e: cylindrical surface, 53h: auxiliary main bearing, 53s: communication passage, 54: main shaft, 54a: swing shaft, 54b: Dynamic shaft space, 54c: main shaft portion, 54e: main shaft balancer, 56: subframe, 56a: auxiliary bearing, 59: Oldham ring, 59a: claw, 65: guide frame, 65a: cylindrical surface, 65c: notch, 65f : Frame space, 65g: outer peripheral surface, 66a: upper sealing material, 66b: lower sealing material, 70: upper auxiliary bearing, 70x: cast hole, 100: single rotary compressor (Embodiment 1), 200: twin Rotary compressor (Embodiment 2), 300: Scroll compressor (Embodiment 3), 400: Inner cylinder single rotary compressor (Embodiment 4), 500: Inner cylinder twin rotary compressor (Embodiment) Form 5), 600: Inner cylinder type scroll compressor (Embodiment 6).

Claims (6)

A sealed container having a refrigerant suction port and a discharge port;
A compression mechanism that is installed in the sealed container and compresses the refrigerant;
A direct current motor unit that is installed in the sealed container and drives the compression mechanism unit;
Have
The motor shaft of the DC motor unit and the drive shaft of the compression mechanism unit are connected by a planetary gear mechanism unit,
The planetary gear mechanism is installed on the drive shaft, the sun gear installed on the motor shaft, the planetary gear rotating and revolving by meshing with the sun gear, the internal gear meshing with the planetary gear, and the planetary gear. A gear shaft that rotatably supports the gear and revolves together with the planetary gear ,
A convex portion or a concave portion is formed at the end of the gear shaft, and a concave portion or a convex portion that fits into the convex portion or the concave portion of the gear shaft is formed at the end of the drive shaft,
The gear shaft and the drive shaft are connected to each other by fitting between a convex portion of the gear shaft and a concave portion of the drive shaft, or fitting between a concave portion of the gear shaft and a convex portion of the drive shaft. Hermetic electric compressor. 2. The hermetic electric compressor according to claim 1, wherein a cross-sectional shape of the convex portion and the concave portion is a rectangle, a hexagon, or a serration. An inner tube is fixed to the compression mechanism part via a fixing part,
The sealed electric motor according to claim 1 or 2 , wherein a motor bearing that rotatably supports the motor shaft, the compression mechanism section, and the DC motor section are installed and integrated in the inner tube. Compressor. The compression mechanism is
A cylinder formed with a vane groove having an opening on the inner surface side;
A crankshaft coupled to the drive shaft and having an eccentric shaft;
A rolling piston that revolves in the cylinder by rotation of the crankshaft;
A plate-like vane whose one end is in contact with the outer periphery of the rolling piston and whose other end reciprocates in the vane groove;
The upper and lower end surfaces of the cylinder are respectively closed, and a bearing portion that rotatably supports the crankshaft;
The hermetic electric compressor according to claim 1 , wherein the hermetic electric compressor is provided. The compression mechanism is
A fixed scroll fixed to the inner periphery of the sealed container, and the orbiting scroll connected to the motor shaft,
The fixed scroll is formed with a spiral plate-like spiral tooth,
A plate-like spiral tooth having substantially the same shape as the plate-like spiral tooth of the fixed scroll is provided on the upper surface of the base plate portion of the swing scroll,
4. The compression chamber is geometrically formed by the plate-like spiral teeth formed on the fixed scroll and the plate-like spiral teeth formed on the swing scroll . The hermetic electric compressor according to one item . The compression mechanism is disposed on the top of the sealed container;
The DC motor part is disposed at the bottom of the sealed container,
The motor shaft is hollow, and an oil supply hole penetrating the side surface is formed,
Hermetic electric compressor according to any one of claims 1 ～3,5, characterized in that it comprises an intermediate pressure chamber of the differential-pressure feed oil.

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