JP2820144B2 - 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, and the rotation axis is substantially horizontal. A lubricating oil reservoir 47 that is disposed and stores lubricating oil is provided at a lower portion of the closed container 41. The compression mechanism 42 includes a fixed scroll blade member 50 in which the fixed scroll blade 49 is integrally formed with the fixed frame body 48, and a swirling scroll blade 5 that meshes with the fixed scroll blade 49 to form the compression work space 54.
1 is formed on a swiveling end plate 52.
And a rotation restricting member 55 for preventing the rotation of the swirling spiral blade member 53. The eccentrically rotating drive is fitted to a rotating drive shaft 56 provided on the opposite side of the rotating spiral blade 51 of the rotating end plate 52. The crankshaft 46 includes a first main bearing 58 for supporting a first main shaft 57 of the crankshaft 46 and a second main shaft 59.
Are cantilevered by a bearing member 61 having a second main bearing 60 for supporting the bearing. Swirling swirl blade 5 of swirling end plate 52
The refrigerant pressure on the suction side is applied to the surface on the side opposite to 1, and the thrust bearing 62 fixed to the 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. Reference numeral 70 denotes a glass terminal provided between the compression mechanism section 42 and the electric motor 43 and fixed to the closed container 41, and supplies electric power to the electric motor 43 from the glass terminal 70. [0005] In FIG.
The numbers are the same as those in the figures, but are disclosed in the microfilm of Japanese Utility Model Application No. 58-42135 (Japanese Utility Model Application Laid-Open No. 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. There is no description of the location of the glass terminal. [0006] The above-mentioned conventional scroll compressor has a so-called cantilever support structure in which the crankshaft 46 is supported on one side of the rotor 45. Since it is necessary to lengthen the main bearing composed of the first main bearing 58 and the second main bearing 59 to support the load on the crankshaft 46, the axial dimension of the compressor increases. Further, since the glass terminal 70 is disposed between the compression mechanism 42 and the electric motor 43, a space between the compression mechanism 42 and the electric motor 43 must be ensured. There has also been a problem that the length of the shaft 46 is unnecessarily long. In a scroll compressor having a double-support structure as shown in FIG. 5, the auxiliary bearing 69 supporting the crankshaft 46 has the main bearing 58 with the electric motor (stator 44 and 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. . Furthermore, there is no disclosure of the location of the glass terminal. The present invention solves the above-mentioned problems, and provides a highly reliable, compact and compact scroll compressor in which a crankshaft is configured as short as possible and an excessive load is not applied to a main bearing. The purpose is to do so. [0010] In order to solve the above-mentioned 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 working 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 arranged for turning drive 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 connected to the main bearing, the main bearing, Across the motor At both ends with a rolling-type bearing provided at the end of the crankshaft on the opposite side, and this rolling bearing is supported by a partition fixed to a closed container, and a lubricating oil reservoir is provided at the bottom of the closed container, and the closed container is provided. A refrigerant gas suction pipe is provided on the compression mechanism side, and a discharge pipe and a glass terminal for supplying electric power to the motor are provided in the closed vessel opposite to the motor with the partition wall in between, and the refrigerant gas is discharged through rolling bearings. To lead outside from the tube. 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. Further, since a glass terminal for supplying electric power to the motor is provided in the closed container opposite to the motor with the partition wall interposed therebetween, no extra space for the glass terminal is required, and the length of the crankshaft is further 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, the lubricating oil contained in the refrigerant gas comes into contact with the rolling bearing, so that lubrication is performed and sufficient durability can be secured. 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 its 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 work 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
Is mounted on a partition 36 fixed to the partition wall 36. Crankshaft 6
Is provided with a first counterweight 34 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, a discharge pipe 33 for discharging the refrigerant gas to the outside, and a glass terminal 37 are provided on the opposite side of the compression mechanism 2 with respect to 3. The lead wire 38 from the glass terminal 37 is drawn upward so as not to be immersed in the lubricating oil reservoir 7 and supplies electric power to the electric motor 3. Further, 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 turning 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) sucked 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, the glass terminal 37 is connected to the main bearing 19.
Since there is no space between the main bearing 19 and the rolling bearing 21, there is no need to provide an extra space for disposing the glass terminal 37 between the main bearing 19 and the rolling bearing 21. Since it does not become extra long,
A more compact and reliable scroll compressor can be obtained. As is apparent from the above embodiments, according to the present invention, the crankshaft to which the rotor of the electric motor is connected is supported at both ends by a main bearing and a rolling bearing. Therefore, the discharge refrigerant gas containing a small amount of lubricating oil is supplied through the rolling bearing to supply oil, and the durability of the sub bearing can be ensured. In addition, a glass terminal is installed in the sealed container on the anti-motor side of the rolling bearing, shortening the length between both bearings of the crankshaft, solving the problem of crankshaft strength, and compact and highly reliable scroll compression. Machine 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 working space 15 Rotation restraining member 16 Rotating drive shaft 17 Main shaft 19 Main bearing 20 Bearing member 2l Rolling bearing 26 Suction pipe 28 Discharge port 33 Discharge pipe 36 Partition wall 37 Glass terminal

────────────────────────────────────────────────── ─── 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 29/00

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 a swirling spiral blade that meshes with the fixed swirl blade to form a compression working space, a rotation restricting member that prevents the swirling spiral blade member from rotating, And a discharge port for discharging the compressed refrigerant gas. The compression mechanism is supported by a bearing member, and a main shaft formed at one end of a crankshaft for rotating the swirling spiral blade member is formed as a main shaft of the bearing member. A rolling type which is supported by bearings, and the crankshaft is connected to a rotor of the electric motor, and the crankshaft is provided at the main bearing and at an end of the crankshaft opposite to the main bearing and the electric motor. Bearing and both While supporting, the rolling bearing is supported by a partition fixed to the hermetic container, a lubricating oil reservoir is provided at the bottom of the hermetic container, and a refrigerant gas suction pipe is provided on the compression mechanism side of the hermetic container, A discharge tube and a glass terminal for supplying electric power to the motor are provided in a sealed container on the opposite side of the motor with the partition wall therebetween, and the refrigerant gas passes through the rolling bearing and is guided to the outside from the discharge tube. Scroll compressor.