JPS63201387A - Compressor - Google Patents

Abstract

PURPOSE:To enable the stable supply of lubricating oil into a compression chamber to be performed further the shortage of lubricating oil to be prevented from its occurrence in a compressor, by providing an oil grove and a communication hole through which oil reservoir space communicates with the inside of an Oldham's chamber and an enclosed vessel. CONSTITUTION:If a crankshaft 37 is rotated by an electric motor 33, lubricating oil in a lubricating oil reservoir 59 passes through the inner of the crankshaft 37 lubricating an eccentric bearing 51 and being fed to oil reservoir space 52 by a feed oil pump 54. A compressor circulates this lubricating oil returning its one part into an enclosed vessel 32 from a return oil port 58 via the first main bearing 46. While the compressor circulates the lubricating oil, excessively accumulated in the oil reservoir space 52, to be returned into the enclosed vessel 32 by a communication hole 53 which communicates with the inside of the enclosed vessel 32. The lubricating oil is supplied into a compression chamber 43 by an oil groove 54, provided in the bottom surface of a turning vane thrust bearing 50, in accordance with a differential pressure generated between the oil reservoir space 52 and the periphery of vane parts 40, 41, and the compressor, even if it is operated under various pressure conditions, attains the stable supply of the lubricating oil.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a compressor for a refrigerator such as an air conditioner or a refrigerator.

Conventional technology Scroll compressors are composed of fixed spiral vanes and rotating spiral vanes, and have a structure in which a small amount of lubricating oil is supplied to the compression chamber for the purpose of sealing leakage gaps and lubricating the sealing material at the blade tips. It has become. In general, so-called "low-pressure side" compressors, where the pressure of refrigerant gas on the suction side acts inside a closed container, are necessarily equipped with a lubricating oil reservoir on the suction side, and all the lubricating oil that comes out of the compression chamber remains as it is. It is discharged from a compressor. If the amount of lubricating oil discharged is too large, it not only causes poor lubrication but also reduces the refrigerating capacity of the refrigerator. Therefore,
It is important for "low pressure type" compressors to always supply an appropriate amount of lubricating oil to the compression chamber.

Conventionally, the supply of lubricating oil to the compression chamber of "low-pressure type" scroll compressors has often been through bypass or leakage from the lubrication circuit, and therefore these conventional compressors have been It is difficult to supply an appropriate amount of lubricating oil to the compression chamber when the pressure changes significantly.

The present invention is for supplying an appropriate amount of lubricating oil to the EE compression chamber in a "low pressure type" scroll compressor even when the rotational speed or refrigerant pressure changes significantly.

FIG. 2 is an example of a conventional scroll compressor.

A stator 2 and a rotor 3 of an electric motor are arranged inside an airtight container 1, and a scroll-type compression mechanism 4 is provided above the electric motor.
The crankshaft 5 of the drive shaft is fed to the rotor 3. The refrigerant enters the closed container 1 from the suction pipe 6 and is sucked into the compression mechanism 4 from the suction lower. 8 is a fixed spiral vane part, 9
is its spiral blade, and 10 is its mirror plate. Reference numeral 11 is a rotating spiral blade part, and 12 and 13 are respective spiral blades and mirror plates.

The spiral vanes 9 and 12 are combined with each other to form a compression chamber 14 that compresses by reducing its volume while moving from the outer periphery toward the center. The compressed refrigerant discharged from the discharge port 15 at the center of the fixed spiral vane component 8 is guided from the discharge chamber 16 to the compressor discharge pipe 17. The force of pressing the swirling spiral vane component 11 against the opposite side of the compression chamber 140 due to the pressure in the compression chamber 14 is supported by a swirling vane thrust bearing 19 fixed to the bearing component 18 . First main shaft 20° second of crankshaft 5
The main shaft 21 is supported by a bearing part 18.

A swing drive bearing 22 is provided inside the first main shaft 20 eccentrically from the axis of the main shaft, and a swing drive shaft 23 provided on the end plate 13 of the swing spiral blade component 11 is fitted into this swing drive bearing. On the outer periphery of the swirling vane thrust bearing 19, an autorotation restraining component 26 for restraining the rotation of the swirling spiral vane component 11, which has keys 25 on both sides of a circular annular body 24, is arranged.

Lubricating oil 27 is stored in the lower part of the closed container 1, and an oil supply pump 28 is attached to the lower end of the crankshaft 5.

The lubricating oil 27 is supplied to the oil supply pump 28, the oil supply hole 29 of the crankshaft 5, the oil supply groove 30. The lubricating oil passes through the through-oil hole 31 , further through the swing drive bearing 22 , passes through the oil groove on the first main shaft 20 , and is discharged from the lubricating oil outlet 32 provided in the bearing component 19 . Therefore, lubricating oil is supplied to the compression chamber 14 from the gap between the end plate 13 of the swirling spiral vane component 11 and the swirling vane thrust bearing 19 .

Problems to be Solved by the Invention However, with such a structure, the amount of lubricating oil in the compression chamber becomes unstable, which not only makes it impossible to obtain stable performance of the compressor, but also causes problems such as an increase in rotational speed, etc. When the amount of lubricating oil from the oil supply pump increases, the amount of lubricating oil supplied to the compression chamber also increases significantly, and a large amount of oil is carried out to the outside of the EEla machine, resulting in poor lubrication of each sliding part. This may lead to a decrease in the refrigerating capacity of the refrigerator.

Means for Solving the Problems The technical means of the present invention for solving the above-mentioned problems is to arrange a compression mechanism in the upper part and an electric motor in the lower part of the closed container. A lubricating oil reservoir to which side pressure acts is provided, and the compression mechanism is connected to a crankshaft having a fixed spiral blade component, a rotating spiral blade component, a crankshaft thrust bearing portion for driving the rotating spiral blade component, and this crankshaft. A bearing component having first and second bearings that supports the rotating spiral blade component, a rotation restraining component that prevents the rotation of the rotating spiral blade component, and a rotating blade thrust bearing that supports the axial auxiliary force, On the lower surface of the thrust bearing, an oil sump space formed by the rotating spiral blade part, the crankshaft, and the rotating blade thrust bearing is communicated with an Oldham chamber formed by the rotating blade thrust bearing and the rotation restraining part. An oil groove is provided in the bearing component, and a communication hole is provided in the bearing component so that the oil reservoir space and the inside of the sealed container are communicated with each other.

Effects The effects of the technical means of the present invention are as follows. Lubricating oil supplied from an oil supply pump attached to the lower end of the crankshaft passes through the inside of the crankshaft, passes through the swing drive bearing, and is stored in the oil sump space.

A portion of the lubricating oil stored in this oil sump space passes through the oil groove on the first main shaft and is discharged from the lubricating oil outlet of the bearing component. On the other hand, the lubricating oil excessively stored in the oil sump space is returned into the closed container through a communication hole that communicates with the inside of the closed container. Lubricating oil is supplied into the compression chamber from an oil groove on the lower surface of the orbiting vane thrust bearing, depending on the pressure difference between the oil reservoir space and the outer periphery of the vane component. Here, the pressure in the oil sump space is in communication with the inside of the sealed container, so it is about the so-called suction pressure, and it is a value close to the outer periphery of the blade parts, and the EE
Even when the compressor is operated under various operating conditions, a stable amount of lubricating oil is supplied into the compression chamber.

EXAMPLE Hereinafter, an example of the present invention will be described based on the accompanying drawings.

FIG. 1 is a sectional view of a pressurizing machine showing one embodiment of the present invention, in which a stator 34 and a rotor 3 of an electric motor 33 are placed inside a closed container 32.
A scroll type EE& mechanism 36 is provided above the electric motor, and the crankshaft 37 of the drive shaft is connected to the rotor 3.
5.

Reference numeral 38 denotes a suction pipe, and the refrigerant sucked through the suction pipe 38 enters the closed container 32 and is discharged from the suction port 39 to the outside of the 847 aircraft via the compression mechanism 36.

40 is a fixed spiral blade part, 41 is a rotating spiral blade part,
Reference numeral 42 denotes the rotating spiral blade shaft, and the two mesh with each other to form a plurality of Ff condensation media 43. 44 a is crankshaft 3
7's first principal axis, 44b is the second principal axis, 46.47
In order to support the first and second main shafts, bearing parts 4 are installed.
These are the first main bearing and the second main bearing provided in 5. Reference numeral 48 denotes an autorotation restraining component that prevents the rotating spiral blade component 41 from rotating and only allows it to rotate; 49 is a rotating blade thrust bearing that receives the axial force of the rotating spiral blade component 41; A crankshaft thrust bearing section 51 supports the axial load applied to the crankshaft between the first main shaft 44 and the second main shaft 45, and 51 is an eccentric bearing of the crankshaft 37, into which the rotating spiral vane shaft 42 is fitted. . Reference numeral 52 denotes an oil sump space formed by the rotating spiral vane component, the crankshaft, and the rotating blade thrust bearing, and 53 indicates the oil sump space 52 and the closed container 3.
This is a communication hole provided to communicate the inside of the 2. Further, 54 is an oil groove provided on the bottom surface of the swirling vane thrust bearing 49 and communicating the oil reservoir space 52 with the Oldham chamber 55 formed by the rotation restraint component 48 and the orbiting vane thrust bearing 49. 56 is an oil supply pump attached to the lower end of the crankshaft 37, 57 is a communication groove provided to communicate the crankshaft thrust bearing part 50 and the eccentric bearing part 51 of the crankshaft 37, and 58 is an oil supply pump attached to the lower end of the crankshaft 37. This is an oil return port for returning oil to the lubricating oil reservoir 59 at the bottom of the closed container 32.

The operation of the compressor configured as above will be described below.

When the crankshaft 37 is rotated by the electric motor 33, the lubricating oil in the lubricating oil reservoir 59 passes through the inside of the crankshaft 37, lubricates the eccentric bearing 51, and is sent to the oil reservoir space 52 by the oil supply pump 56. A part of the lubricating oil stored in the oil sump space 52 passes through the first main shaft 46 and enters the closed container 3 from the oil return port 58.
Returned to 2. On the other hand, the lubricating oil excessively stored in the oil reservoir space 52 is removed through a communication hole 53 that communicates with the inside of the sealed container 32.
It is then returned to the sealed container 32. Lubricating oil is supplied into the compression chamber 43 from the oil groove 54 according to the pressure difference between the oil reservoir space 52 and the outer periphery of the blade parts 40 and 41. The pressure in the oil sump space 52 is in communication with the inside of the closed container 32 through the communication hole 53, so it is about the so-called suction pressure, and it has a value close to the outer circumference of the blade parts 40, 41, so that it can be adjusted under various pressure conditions of the compressor. Even during operation, the amount of lubricating oil is stably supplied into the compression chamber 43. Further, by providing the oil groove 54 on the lower surface of the swirl vane thrust bearing 60, the oil groove 54 is provided on a non-movable surface, thereby realizing stable oil supply.

Effects of the Invention As described above, according to the present invention, an oil groove is provided on the lower surface of the swirl vane thrust bearing to communicate the oil sump space with the Oldham chamber, and an oil groove is provided to communicate the oil sump space with the inside of the closed container. By providing communication holes in the bearing parts, lubricating oil can be stably supplied into the compression chamber even when the rotary compressor is operated under various pressure conditions and rotational speeds.
A shortage of lubricating oil in the compressor can be prevented, and a highly reliable compressor can be realized.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a compressor in an embodiment of the present invention;
FIG. 2 is a longitudinal sectional view of a conventional compressor. 32... Airtight container, 33... Electric motor,
36...EE compression mechanism, 37...Crankshaft, 40...Fixed spiral blade parts, 41...
... Rotating spiral blade parts, 45... Bearing parts,
46...First bearing, 47...Second bearing, 48...Rotation restraint component, 49...Swivel vane thrust bearing, 50... ...Crankshaft thrust bearing part, 52...Oil sump space, 53...
...Communication hole, 64...Oil groove, 55...
・Oldham Room.

Claims (1)

[Claims] A compression mechanism is disposed in the upper part of the airtight container, an electric motor is disposed in the lower part, a lubricating oil reservoir is provided at the bottom to which the pressure on the suction side of the compression mechanism acts, and the compression mechanism is composed of a fixed spiral vane component and a rotating spiral vane. a crankshaft having a crankshaft thrust bearing portion for driving the rotating spiral vane component; a bearing component having first and second bearings supporting the crankshaft; and preventing rotation of the rotating spiral vane component. an oil sump comprising an autorotation restraint component and a swirling vane thrust bearing that supports the axial force, and formed on the lower surface of the swirling vane thrust bearing by the orbiting spiral vane component, the crankshaft, and the orbiting vane thrust bearing; An oil groove is provided so as to communicate between the space and the Oldham chamber formed by the swirl vane thrust bearing and the rotation restraint component, and an oil groove is provided so as to communicate between the oil sump space and the inside of the sealed container. A compressor with a communicating hole.