JPH0776555B2 - Electric compressor - Google Patents

Description

TECHNICAL FIELD The present invention relates to an electric compressor for a refrigerator.

2. Description of the Related Art FIG. 6 and FIG. 7 show the structure of an electric compressor that is often used in conventional small air conditioners. 6 and 7, the stator of the electric motor is attached to the inner wall of the cylindrical hermetic container 71.
72 is fixed, and one end of the drive shaft 75 of the compression mechanism 74 fixed to the inner wall of the closed container 71 is fitted to the rotor 73 of the electric motor. The compressor 74 is designed in a horizontal type in which the drive shaft 75 is located substantially horizontally.

The compression mechanism 74 is a cylinder member 77 having a cylindrical cylinder 76,
A main shaft side bearing end plate 78 and an end shaft side bearing end plate 79 each having a bearing portion that supports the drive shaft 75 and an end plate portion that closes both ends of the cylinder 76, and a cylinder that is fitted into the eccentric portion 80 of the drive shaft 75.
It is composed of a cylindrical piston 81 that swirls inside 76, a partition plate 83 that partitions the compression space 82 formed by the outer periphery of the piston 81 and the cylinder 76 into a high pressure side and a low pressure side.

The refrigerant gas sucked from the suction pipe 85 is the suction port of the compression mechanism 74.
After being sucked into the cylinder 76 via 86 and compressed, it is discharged from the discharge valve 87 provided on the main shaft side bearing end plate 78 to the discharge space 89 around the compression mechanism 74 via the discharge muffling chamber 88. The lubricating oil 90 accumulated in the lower part of the closed container 71 lubricates each part of the compression mechanism 74, and then a considerable part of the lubricating oil 90 is discharged as an oil drop into the discharge space 89.

The refrigerant gas discharged into the discharge space 89 accompanies a part of the oil droplets of the lubricating oil 90, and the side passage 91 of the stator 72 of the electric motor.
Through the discharge chamber 92, and is discharged from the discharge pipe 93 to the outside of the compressor. If the cross-sectional area of the side passage 91 is increased, the iron core cross-sectional area of the electric motor is reduced and the efficiency is lowered. Therefore, some pressure loss of the compressed refrigerant gas is usually generated in the side passage 91. Therefore, the lubricating oil level on the discharge chamber 92 side tends to be higher than on the compression mechanism 74 side of the electric motor.

A horizontal compressor having a small diameter and a low height of the closed container is often used for an air conditioner or a refrigerator having a low external height.

Problems to be Solved by the Invention In the horizontal electric compressor in which the drive shaft 75 is horizontally placed as described above, if the diameter of the electric motor is small, the rotor of the electric motor easily comes into contact with the lubricating oil surface, When the rotor comes into contact with the oil surface and rotates, large vibration and large power loss occur, and violent oil droplets are generated and discharged together with the compressed refrigerant gas, which may cause lack of lubricating oil. In addition, in order to avoid contact between the rotor and the lubricating oil surface using the conventional technology for this horizontal compressor, the diameter of the hermetically sealed container must be increased for the capacity of the compressor. This leads to an increase in the height of the compressor.

The present invention solves the above-mentioned problems, and the rotor is prevented from coming into contact with the lubricating oil surface, and the input and the lubricating oil discharge amount are not increased without increasing the diameter of the hermetically sealed container. It is an object of the present invention to provide a low cost, high efficiency electric compressor.

Means for Solving the Problems The present invention for solving the problems of the above-mentioned conventional electric compressor is provided with a compression mechanism and an electric motor for driving the compression mechanism inside a hermetic container, and a stator of the electric motor. It is fixed to this closed container, the rotor of the electric motor is arranged inside this stator, the drive shaft of the compression mechanism is connected to the rotor of the electric motor and it is arranged almost horizontally, and this rotor is A first rotor end cover surrounding the compression mechanism side end or both ends of the child, or
A second rotor end cover is provided, and a rotary part that rotates in proximity to the inside of the rotor end cover is formed at the end of the rotor on the compression mechanism side or both ends. An opening is provided on the upper side of the first rotor end cover, and the discharge port of the compressor is opened toward the inside of the first rotor end cover.

Further, the main flow of the compressed gas exiting the opening of the first rotor end cover on the compression mechanism side passes through the side of the stator, and then the second flow from the opening of the second rotor end cover on the side opposite to the compression mechanism to the second side. It is introduced into the rotor end cover of No. 2 and is guided to the discharge pipe by the rotation of the rotating part on the side opposite to the compression mechanism.

Action With the above configuration, the lubricating oil that has entered the rotor end cover is rotated together with the rotating piece, and centrifugal force acts on this lubricating oil.
The space is provided outside the rotor end cover through an opening provided on the upper side of the rotor end cover. Therefore, since the amount of lubricating oil that enters the rotor end cover is extremely small, the rotor will not come into contact with the lubricating oil surface during normal operation.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a vertical sectional view of a rotary electric compressor according to a first embodiment of the present invention, and FIG. 2 is a horizontal sectional view thereof. 1 and 2, the stator 2 of the electric motor is fixed to the inner wall of the cylindrical hermetic container 1, and the rotor 3 of the electric motor has one end of the drive shaft 5 of the compression mechanism 4 fixed to the inner wall of the hermetic container 1. Is fitted. The drive shaft 5 is arranged horizontally.

The compression mechanism 4 includes a cylinder member 7 having a cylindrical cylinder 6.
The main shaft side bearing end plate 8 and the end shaft side bearing end plate 9 each having a bearing portion supporting the drive shaft 5 and an end plate portion closing the cylinder 6, and the eccentric portion 10 of the drive shaft 5 are fitted into the cylinder 6 It is composed of a cylindrical piston 11 that swirls, and a partition plate 13 that partitions the compression space 12 formed by the outer periphery of the piston 11 and the cylinder 6 into a high pressure side and a low pressure side.

The refrigerant gas sucked from the suction pipe 15 is sucked into the cylinder 6 through the suction port 16 of the compression mechanism 4 and compressed, and then the compression of the stator 2 is performed from the discharge port 17 provided in the main shaft side bearing end plate 8. It is discharged to the inside of the first rotor end cover 18a that is arranged on the mechanism side and surrounds the periphery of the end of the rotor 3, and flows from the opening 19a of the first rotor end cover 18a to the stator lateral passage 20. After passing through the discharge chamber 21, it is discharged from the compressor discharge pipe 22 to the outside of the compressor.

FIG. 3 shows a perspective view of the first rotor end cover 18a.

A space between the outer side of the first rotor end cover 18a and the inner side of the closed casing 1 serves as a lubricating oil sump 23. The rotary part 24, which is formed at the end of the rotor 3 on the compression mechanism side and rotates in proximity to the inside of the first rotor end cover, is the first rotor end cover 18.
The lubricating oil that has entered into a is given rotation and the centrifugal force that accompanies it, and is discharged from the opening 19a.

FIG. 4 is a vertical cross-sectional view of a scroll-type electric compressor according to a second embodiment of the present invention, and FIG. 5 is a cross-sectional view of the compression mechanism portion thereof. 4 and 5, the stator 34 of the electric motor 33 that drives the compression mechanism 32 is fixed inside the closed container 31, and the rotor 35 of the electric motor 33 is connected to the crankshaft 36 that drives the compression mechanism 32. Thus, the rotation axis of the crankshaft 36 is arranged substantially horizontally. A lubricating oil reservoir 37 is provided below the closed container 31.

The compression mechanism 32 swivels a fixed spiral blade member 40 in which a fixed spiral blade 39 is integrally formed on a fixed frame 38, and a swirl spiral blade 41 that meshes with the fixed spiral blade 39 to form a plurality of compression work spaces 44. Swirling spiral blade member 43 formed on the end plate 42
And a rotation restraint member 45 for preventing the rotation of the swirling spiral blade member 43 and only rotating the swirling spiral blade member 43. A crankshaft 36 is fitted into an eccentric bearing 48 provided inside a main shaft 47 formed at one end of the shaft 36, and the crankshaft 36 has a bearing member 50 having a main bearing 49 for supporting the main shaft 47 and an opposite side of the main shaft 47. It is supported by a rolling bearing 51 that supports the end of the crankshaft 36. Further, a back pressure partition ring 52 is provided on the back surface of the swivel mirror plate 42 to partition the back pressure applied to the swivel mirror plate 42 in the radial direction. A gas pressure lower than the pressure on the discharge side is applied to the surface 53 of the swirl mirror plate 42 on the opposite side of the swirl spiral blade 41.

The compression mechanism 32 is welded to the airtight container 31 at the outer peripheral edge 54, and partitions the space inside the airtight container 31 into the electric motor 33 side and the opposite side of the electric motor 33.

The refrigerant gas sucked from the suction pipe 55 of the compressor is sucked into the suction port 57.
And is compressed in the compression work space 44 through the discharge port 58 into the first rotor end cover 59a arranged so as to surround the end of the rotor 35 at the end of the stator 34 on the compression mechanism side. The second rotor end cover provided on the side opposite to the compression mechanism of the stator 34 from the opening 60a provided on the upper side of the first rotor end cover 59a through the electric motor side lateral passage 61. The discharge chamber 63 defined by the discharge passage partition wall 62 is inserted from the opening 60b of the 59b into the second rotor end cover 59b and passes from the center of the second rotor end cover 59b to the vicinity of the rolling bearing 51. After that, it is discharged to the outside of the compressor through the discharge pipe 64.

The lubricating oil slightly penetrating into the insides of the first and second rotor end covers 59a and 59b is formed on both sides of the rotor 35, and inside the first and second rotor end covers 59a and 59b. Rotation is given by the rotating part pieces 65a and 65b that rotate in close proximity, and the rotating part pieces 65a and 65b go out due to the centrifugal force or the like.

EFFECTS OF THE INVENTION As described above, according to the present invention, the lubricating oil slightly entering the inside of the first and second rotor end caps is collected around the first and second rotor end caps. Since the rotor does not touch the lubricating oil surface, there is no increase in input or increase in lubricating oil discharge amount without increasing the diameter of the sealed container of this horizontal compressor, and it is compact, low cost, highly efficient and highly reliable. It is possible to realize an electric compressor with excellent performance.

In addition, since the lubricating oil is stored in the space around the rotor end lid, a large lubricating oil storage space can be secured, and even a small size can store a sufficient amount of lubricating oil, so the capacity is large for the size and height of the outer shape. An electric compressor can be realized.

[Brief description of drawings]

1 and 2 are a longitudinal sectional view and a lateral sectional view of a first embodiment of an electric compressor of the present invention, and FIG. 3 is a perspective view of a first rotor end cover of the electric compressor, 4 and 5 are longitudinal and transverse sectional views of a second embodiment of the electric compressor of the present invention, and FIGS. 6 and 7 are longitudinal and transverse sectional views of a conventional electric compressor. is there. 1, 31 ...... hermetically sealed container, 2, 34 ...... stator, 3, 35 ...... rotor, 4, 32 …… compression mechanism, 5, 36 …… drive shaft, 17, 58
...... Discharge port, 18a, 59a …… First rotor end cover, 18b, 59b
...... Second rotor end cover, 19a, 19b, 60a, 60b …… Aperture, 24, 65a, 65b …… Rotating piece

Claims (2)

[Claims] 1. A compression mechanism and an electric motor for driving the compression mechanism are provided inside a closed container, a stator of the electric motor is fixed to the closed container, and a rotor of the electric motor is provided inside the stator. A first shaft surrounding the compression mechanism side end or both side ends of the rotor, the drive shaft of the compression mechanism being coupled to the rotor and arranged substantially horizontally. A rotor end cover or a first and a second rotor end cover is provided, and the rotor end cover is provided close to the inner end of the rotor end cover at the compression mechanism side end or both ends of the rotor. Form a rotating piece that rotates,
An electric compressor in which an opening is provided on the upper side of the first rotor end cover and the discharge port of the compressor is opened toward the inside of the first rotor end cover. 2. The main flow of the compressed gas exiting the opening of the first rotor end cover on the compression mechanism side passes through the side of the stator, and the opening of the second rotor end cover on the side opposite to the compression mechanism. 2. The electric compressor according to claim 1, wherein the electric compressor is introduced into the second rotor end cover from the above, and is guided to the discharge pipe by the rotation of the rotating part opposite to the compression mechanism.