JP2820146B2 - Scroll compressor - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll type electric compressor. FIG. 3 is a longitudinal sectional view of a conventional scroll compressor, and FIG. 4 is a transverse sectional view of a compression mechanism. FIG. 5 is a longitudinal sectional view of another conventional scroll compressor. In FIG. 3 and FIG.
1, a stator 44 of an electric motor 43 for driving the compression mechanism 42 is fixed, and a rotor 45 of the electric motor 43 is directly connected to a crankshaft 46 for driving the compression mechanism 42. A lubricating oil reservoir 47 for storing oil is provided. The compression mechanism 42 includes a fixed scroll blade member 50 in which a fixed scroll blade 49 is integrally formed with a fixed frame body 48, and a swirling spiral blade 51 that meshes with the fixed scroll blade 49 to form a compression working space 54. A rotating drive shaft provided on the opposite side of the rotating spiral plate 51 of the rotating end plate 52, including a rotating spiral blade member 53 formed thereon and a rotation restricting member 55 for preventing rotation of the rotating spiral blade member 53; The crankshaft 46 which is fitted to the shaft 56 and driven to rotate eccentrically is a bearing member 61 having a first main bearing 58 for supporting a first main shaft 57 of the crankshaft 46 and a second main bearing 60 for supporting a second main shaft 59. Is cantilevered. Swivel head 5
The refrigerant gas pressure on the suction side is applied to the surface on the opposite side of the second swirling blade 51, and a thrust bearing 62 fixed to a bearing member 61 supports the turning head plate 52 in the axial direction. [0004] The refrigerant gas sucked from the suction pipe 63 of the compressor is heated by touching the electric motor 43 and the lubricating oil in the closed container 41, and then passes through the suction port 64 of the compression mechanism 42 to be compressed in the compression working space 54. The compressed air is discharged from the discharge pipe 65 through the discharge chamber 66 to the discharge pipe 67 of the compressor.
Reference numerals 68 and 69 denote a first counterweight and a second counterweight respectively fixed to the end faces of the rotor 45 on the compression mechanism 42 side and the opposite side. [0005] In FIG.
The numbers are the same as those in the figure, but are described in the microfilm of Japanese Utility Model Application No. 58-42135 (Japanese Utility Model Application Laid-Open No. Sho 59-148487). The compression mechanism 42 is disposed in the lower part of the closed container 41, and the electric motor (the stator 44 and the rotor 45) is disposed in the upper part.
The high-speed refrigerant gas discharged from the discharge port is blown against the oil surface of the lubricating oil reservoir 47 at the bottom to spray the lubricating oil in the form of a mist into the sealed container 1 so that the auxiliary bearing 69 is filled.
Have lubricated. In this case, unlike FIG. 3, the crankshaft 46 has a double-supported structure supported by both main bearings 58 and auxiliary bearings 69. In the above-described conventional scroll compressor shown in FIG. 3, the crankshaft 46 is connected to the rotor 4.
5, the main bearing composed of the first main bearing 58 and the second main bearing 59 of the bearing member 61 needs to be long to support the load on the crankshaft 46. Therefore, the axial dimension of the compressor is increased. [0007] Also in the scroll compressor having a double-support structure as shown in Fig. 5, the sub bearing 69 supporting the crankshaft 46 has the main bearing 58 with the electric motor (stator 44, rotor 45) interposed therebetween.
, It was necessary to lubricate both bearings together, and there was no appropriate lubrication system. Also, the sub bearing 69
However, since the conventional bearing is a conventional sliding bearing, there is a problem that the auxiliary bearing 69 is burned unless a large amount of lubricating oil is supplied. In this case, a high-pressure refrigerant gas discharged from the compression mechanism 42 is sprayed on the oil surface at the bottom to create an oil mist, thereby filling the inside of the closed container 41 and lubricating the auxiliary bearing 69. However, since the inside of the closed container 1 is filled with the oil mist, a large amount of oil flows out of the closed container 1 through the discharge pipe 67, and another problem that the oil in the lubricating oil reservoir 47 runs short occurs. . The present invention solves the above problems, and provides a highly reliable, compact and compact scroll compressor in which the crankshaft is configured as short as possible, without applying an excessive load to the main bearing. The purpose is to do so. [0009] In order to solve the above problems, the present invention provides an electric motor including a stator and a rotor and a compression mechanism driven by the electric motor inside a closed container. This compression mechanism is provided with a fixed spiral blade member having a fixed frame body formed with fixed spiral blades, and a swirl spiral blade formed on a swivel end plate with swirling spiral blades meshing with the fixed spiral blades to form a compression work space. A rotation restricting member for preventing the rotation of the swirling spiral blade member, and a discharge port for discharging the refrigerant gas compressed in the compression working space, supporting the compression mechanism with a bearing member, The main shaft formed at one end of the crankshaft that drives the orbit is supported by the main bearing of the bearing member, the crankshaft is connected to the rotor of the electric motor, and the crankshaft is opposed to the main bearing and the main bearing and the motor with the electric motor interposed therebetween. Side clan With both ends supported by a rolling bearing provided at the end of the shaft.
This rolling bearing is supported by a partition fixed to the sealed container, and the center of the partition is extended toward the rotor to support the rolling bearing, and a lubricating oil reservoir is provided at the bottom of the sealed container, A discharge pipe is provided in a sealed container on the opposite side of the electric motor with the partition wall interposed therebetween, and refrigerant gas is passed through rolling bearings and guided to the outside from the discharge pipe. According to the above construction, since the crankshaft is supported by the bearings at both ends, the load of the compressed refrigerant gas applied to the swirling spiral blade member is divided into a main bearing and an auxiliary bearing. Therefore, the load area of each bearing can be reduced, that is, the length of the crankshaft is reduced. The auxiliary bearing is located far from the main bearing and needs to be lubricated together, making lubrication difficult.However, since the auxiliary bearing is a rolling bearing, unlike a normal plain bearing, durability is maintained even with a small amount of lubricating oil When the refrigerant gas discharged from the compression mechanism passes through the rolling bearing, lubricating oil contained in the refrigerant gas comes into contact with the rolling bearing, so that the lubricating oil is supplied. Furthermore, a rolling type bearing supported by a partition is disposed on the side opposite to the compression mechanism of the rotor, the crankshaft is supported by main bearings and rolling type bearings at both ends, and the partition is extended toward the rotor. Since the rolling bearing is as close as possible to the rotor side, the crankshaft is shortened, the moment for bending the crankshaft is reduced, and a compact compressor is obtained. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a vertical cross-sectional view of a scroll type electric compressor according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a compression mechanism. In FIG. 1 and FIG.
The stator 4 of the electric motor 3 for driving the compression mechanism 2 is fixed inside, and the crankshaft 6 is coupled to the rotor 5 of the electric motor 3, and the rotation axis of the crankshaft 6 is arranged substantially horizontally. . The lower part of the sealed container 1 is a lubricating oil reservoir 7. The compression mechanism 2 pivots a fixed spiral blade member 10 in which a fixed spiral blade 9 is integrally formed with a fixed frame body 8 and a swirling spiral blade 11 which meshes with the fixed spiral blade 9 to form a compression working space 14. It has a swirling spiral blade member 13 formed on the end plate 12 and a rotation restricting member 15 for preventing the swirling spiral blade member 13 from rotating, and is provided on the opposite side of the swirling spiral blade 11 of the swirling end plate 12. Swing drive shaft 16
Is fitted into an eccentric bearing 18 provided inside a main shaft 17 formed at one end of the crankshaft 6, and the crankshaft 6 has a main bearing 19 having a main bearing 19 supporting the main shaft 17.
The main shaft 17 is supported at both ends of a rolling bearing 21 which is an auxiliary bearing that supports an end of the crankshaft 6 on the opposite side of the rotor 5 with the rotor 5 interposed therebetween. The rolling bearing 21 is a sealed container 1
The rolling bearing 21 is supported by supporting a partition 36 fixed to the rotor 5 and projecting a central portion of the partition 36 toward the rotor 5. A first counterweight 34 is provided on the crankshaft 6 between the main shaft 17 and the rotor 5. A second counterweight 35 is formed on the side of the rotor 5 opposite to the compression mechanism 2. A refrigerant gas suction pipe 26 is provided on the compression mechanism 2 side of the closed casing 1, and a discharge port 28 for discharging the refrigerant gas compressed in the compression working space 14 is provided on the swirling spiral blade member 13. A discharge chamber 32 and a discharge pipe 33 for guiding the refrigerant gas to the outside are provided on the opposite side of the compression mechanism 2 with respect to 3. An axial limiting plate 23 for limiting the axial movement of the swirling spiral blade member 13 is provided at a small gap 22 from the back of the swivel head plate 12. On the back side, this back side is slidable and seals the minute gap 22, and the discharge pressure acts on the center side of the back side,
An annular back pressure partition 24 is provided to partition the back shovel chamber 25 on the outer peripheral portion so that a lower back pressure is applied. In the above configuration, the refrigerant gas (not shown) drawn from the suction pipe 26 attached to the closed container 1 enters the compression mechanism 2 through the suction port 27 of the compression mechanism 2 and is compressed in the compression work space 14. From the discharge roller 28 to the motor side passage 3
1 through the discharge pipe 32 from the discharge chamber 32 to the closed container 1
It is discharged outside. At this time, the discharged refrigerant gas containing a small amount of lubricating oil passes through the rolling bearing 21, so that the lubricating oil touches the rolling bearing 21 and is supplied. Since the auxiliary bearing is a rolling bearing 21, the durability can be ensured even with a small amount of lubricating oil unlike a normal plain bearing. An axial force and a radial force perpendicular to the axial force are generated in the swirling spiral blade member 13 by the refrigerant gas compressed in the compression work space 14. The axial force is supported by the turning head 12 on the axial control plate 23 on the bearing member 20, and the radial force is supported by the turning drive shaft 16 mainly on the main bearing 19 via the eccentric bearing 18. Compression mechanism 2 of rotor 5
The rolling bearing 21 is disposed on the opposite side to support the rotor 5 by supporting the crankshaft 6 at both ends.
Since almost no moment acts on the bearing 9 and the radial force is split between the two bearings, the load on the main bearing 19 is further reduced, so that the size can be reduced. Further, since the rolling bearing 21 is supported by a partition 36 fixed to the closed casing 1, and the center of the partition 36 is extended to the rotor 5 side to support the rolling bearing 21, Bearing 1
The length of the crankshaft 6 between the bearing 9 and the rolling bearing 21 can be made shorter, and a more compact and reliable scroll compressor can be obtained. As is apparent from the above embodiments, according to the present invention, a dual-support structure in which one of a crankshaft to which a rotor of an electric motor is connected is a main bearing and the other is a rolling bearing. Therefore, the discharge refrigerant gas containing a small amount of lubricating oil is allowed to pass through the rolling bearing, so that the durability of the auxiliary bearing can be ensured. Furthermore, since the central portion of the partition wall that supports the rolling bearing is extended toward the rotor, the length between the two bearings of the crankshaft can be made shorter, and a more compact and highly reliable scroll compressor can be realized. .

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of a scroll compressor showing one embodiment of the present invention. FIG. 2 is a transverse sectional view of a scroll compressor showing one embodiment of the present invention. FIG. 4 is a cross-sectional view of a conventional scroll compressor. FIG. 5 is a cross-sectional view of another conventional scroll compressor. [Description of References] 1 Closed vessel 2 Compression mechanism 3 Electric motor 4 Stator 5 Rotor 6 Crankshaft 7 Lubricating oil reservoir 8 Fixed frame 9 Fixed spiral blade 10 Fixed spiral blade member 11 Rotating spiral blade 12 Rotating head plate 13 Rotating spiral blade member 14 Compression work space 15 Rotation restraining member 17 Main shaft 19 Main bearing Reference Signs 20 bearing member 2l rolling bearing 26 suction pipe 28 discharge port 33 discharge pipe 36 partition wall

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Hiroshi Karado 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (56) References Real Opening Sho-59-167983 (JP, U) (58) Survey Field (Int.Cl. ⁶ , DB name) F04C 18/02 311 F04C 29/02

Claims (1)

(57) [Claims] Inside the closed container, an electric motor composed of a stator and a rotor and a compression mechanism driven by the electric motor are arranged, and the compression mechanism is a fixed spiral blade member having a fixed frame formed with fixed spiral blades, A swirling spiral blade member formed on a swiveling end plate with swirling spiral blades meshing with the fixed swirl blades to form a compression working space, a rotation restraining member for preventing rotation of the swirling spiral blade member, A main shaft formed at one end of a crankshaft configured to support the compression mechanism by a bearing member and to drive the swirling spiral blade member to rotate, by a main bearing of the bearing member. Bearing, the crankshaft is coupled to a rotor of the electric motor, the crankshaft is connected to the main bearing, and a rolling bearing provided at an end of the crankshaft opposite the main bearing and the electric motor. With both ends supported The rolling bearing is supported by a partition fixed to the hermetic container, and a central portion of the partition protrudes toward the rotor to support the rolling bearing and lubricate the bottom of the hermetic container. A scroll compressor provided with an oil reservoir, a discharge pipe provided in a closed container opposite to the electric motor with the partition wall interposed therebetween, and the refrigerant gas passing through the rolling bearing and being guided to the outside from the discharge pipe.