JPH02157493A - Oiler for enclosed rotary compressor - Google Patents

Abstract

PURPOSE:To facilitate the aligning of a spindle with the axis of a pump and the assemblage thereof for improving the reliability by supporting a second housing for supporting rotatably the pump on a first housing having an insert hole of an oil intake pipe body. CONSTITUTION:An oil pump 32 connected by a joint 29 having a spindle of a compressor and a through hole 30 is received in a pump housing 33 fixed to a stator of a motor. This pump housing 33 is constituted of a first housing 38 having an inset hole 37 of an oil intake pipe body 36, a second housing 39 received and held in the first housing to rotatably support an oil pump 32 and a third housing 40. Further, the second housing 39 is provided with a projection 42 and a spring 43 is elastically inserted between the second and third housings 39, 40. Thus, the spindle can be easily aligned wit the drive shaft of the oil pump 32 in the assemblage to enable forcible oil supply and improve the reliability.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a lubricating device for a hermetic rotary compressor used in equipment such as air conditioners or refrigerators.

[Conventional technology]

Conventionally, this type of hermetic rotary compressor was developed in Japanese Patent Application Laid-open No. 59-12.
A horizontal expansion compressor is disclosed in Japanese Patent No. 0796, and is constructed as shown in FIG. To explain this based on the same figure, in the same figure, the symbol l is a cylindrical sealed container with an oil reservoir 2 at its bottom and a central axis extending in the horizontal direction, and 3 is this sealed container 1. A main shaft 5 provided therein and rotated by a motor 4 is a compression mechanism (internal) connected to the main shaft 3 and having a compression chamber 6 for compressing fluid. The compression mechanism 5 is provided with an oil reservoir pocket 7 that opens upward and a passage 8 that supplies oil in the oil reservoir pocket 7 to each bearing. Also,
9 is a splasher fixed on the main shaft 3 and splashes oil into the oil reservoir pocket 7; 10 and 11 are suction pipes and discharge pipes that open into and out of the sealed container 1; 12 is a suction space in the sealed container 1; This is a communication pipe that communicates the intake port of the compression mechanism 5 with the intake port of the compression mechanism 5.

In the hermetic (rotary) compressor configured in this way, fluid sucked into the hermetic container l from the suction pipe 10 passes through the air gap of the motor 4 as shown by the solid line arrow in FIG. After being gradually compressed in the compression chamber 6, it is discharged from the discharge pipe 11 to the outside of the closed container l. At this time, motor 4
is cooled by fluid.

On the other hand, the lubricating oil in the oil reservoir 2 is splashed by the splasher 9 as shown by the broken line arrow in FIG. 3, passes through the oil reservoir pocket 7 and the passage 8, and is supplied to each bearing.

[Problem to be solved by the invention]

By the way, in this type of hermetic rotary compressor, the lubrication method for each bearing is a splash lubrication method using the splasher 9, so it is not possible to secure a sufficient amount of lubrication compared to a forced lubrication method. However, there was a problem in that the reliability of bearing oil supply was reduced.

Therefore, it is possible to fix a positive displacement pump to the shaft end of the main shaft 3, but in this case, the main bearing may be damaged due to the inclination of the main shaft 3, or the pump may malfunction due to the inclination of the pump drive shaft. Therefore, during assembly, careful attention must be paid to aligning the drive shaft of the pump with the axis of the main shaft 3, making the compressor assembly difficult.

The present invention has been made in view of the above circumstances, and provides a lubricating device for a hermetic rotary compressor that can increase the reliability of bearing lubricating and also facilitate the assembly of the compressor. It provides:

[Means to solve the problem]

A lubrication device for a hermetic rotary compressor according to the present invention connects a positive displacement pump that forcibly lubricates each bearing to a main shaft rotated by a motor, and provides a housing for housing this pump in a sealed container. consists of a first housing having an insertion hole through which an oil suction tube is inserted, and a second housing that is held by the first housing and connected to the tube to rotatably support the pump. The second housing is held with respect to the first housing so as to be adjustable in the axial direction and radial direction of the main shaft.

[For production]

In the present invention, each sliding part can be forcibly lubricated by a positive displacement pump during operation, and by adjusting the second housing with respect to the first housing in the axial direction and radial direction of the main shaft during assembly, assembly errors can be made. can be absorbed.

〔Example〕

EMBODIMENT OF THE INVENTION Hereinafter, the structure etc. of this invention will be explained in detail by the Example shown in the figure.

FIG. 1 is a cross-sectional view showing the main parts of a lubricating device for a hermetic rotary compressor according to the present invention, and FIG. 2 is a cross-sectional view showing an example in which the lubricating device according to the present invention is implemented in a hermetic rotary compressor. In this figure, the same members and members corresponding to those in FIG. 3 are denoted by the same reference numerals, and detailed explanations thereof will be omitted. In the figure, what is indicated by 21 is a shell as a closed container having an oil reservoir 22 at its bottom, which is composed of a cylindrical body 23 forming the peripheral wall of the shell and a lid body 24 that closes the opening of this cylindrical body 23. A corner portion 25 is provided at a portion where the peripheral wall and the bottom of the cylindrical body 23 intersect, and the compression mechanism 5 is fitted and fixed within this shell 21. 26 is a main shaft rotated by the motor 4, which is provided inside the shell 21;
A first oil passage 27 extending in the axial direction and a second passage 28 opening in the radial direction are formed inside. 29
is a cylindrical joint having a through hole 30 that opens in the radial direction, and is connected to the lower end of the main shaft 26 so as to communicate with the first oil passage 27, and the lower end has a notch that opens downward. A notch 31 is provided. Reference numeral 32 denotes a positive displacement oil pump consisting of, for example, a trochoid-type pump, which is connected to the lower end of the joint 29 and rotatably housed in the pump housing 33. A protrusion 35 having a rectangular cross section and fitting into the notch 31 is provided. The oil pump 32 is connected to the first oil passage 27 during compressor operation.
It is configured to forcibly supply oil to each bearing (sliding portion of the compression mechanism 5) via the second oil passage 28 and the like. Pump housing 3 that houses this oil pump 32
3 is a first housing 38 having a bottomed cylindrical shape and having an insertion hole 37 screwed onto the stator 4a of the motor 4 and through which an oil suction tube 36 is inserted at an eccentric position of the main shaft 26; The tube body 3 is housed and held within the housing 38 and
6 and rotatably supports the oil pump 32; and a third housing 40 in the shape of a cylinder with a bottom and provided around the second housing 39 and fixed within the first housing 38. It is composed of. Of these, the second housing 39 is provided with a hemispherical protrusion 42 that contacts the flat surface 41 of the first housing 40, and a thrust force generating member is provided between the second housing 39 and the third housing 40. A spring 43 is loaded. Thereby, the second housing 39
The main shaft 26 is held in the housing 38 so as to be adjustable in the axial direction and the radial direction. The second housing 39 also includes a housing a that is inserted into the third housing 40 and has a through hole 44 through which a part of the joint 29 faces, and an oil casing that is provided below the housing a and communicates with the tubular body 36. It consists of a casing having a suction port 45, and a casing C provided between this casing and the casing a and having an oil discharge port 46. (not shown) is formed.

Further, the internal volume of the third housing 40 is
9 has a sufficiently large internal volume for movement adjustment with respect to the first housing 38, and the insertion hole 37 of the first housing 38
The diameter of the tube is set to be sufficiently larger than the diameter of the tube body 36. Note that the broken line arrow in FIG. 1 indicates the oil supply direction, and the arrow F indicates the direction of the thrust force that the second housing 39 receives due to the elastic force of the spring 43.

In the hermetic rotary compressor configured in this way,
During operation, each sliding portion of the compression mechanism 5 can be forcibly supplied with oil by the oil pump 32, and a sufficient amount of oil can be ensured.

Furthermore, in the present invention, when aligning the drive shaft 34 of the oil pump 32 with the axial center of the main shaft 26 (joint 29) during assembly, the second housing 39 is aligned in the axial direction of the main shaft 26 with respect to the first housing 38. By adjusting in the radial direction, assembly errors can be absorbed.

That is, when assembling the compressor, the second housing 39 moves around the point P of the protrusion 42 as a fulcrum, as shown by arrow B in FIG. In addition, the second housing 39 and the third housing 40 can move relative to each other to absorb assembly errors due to coaxiality.

Furthermore, in the present invention, if sheet metal is used as the material for the first housing 38 and the third housing 40, productivity can be increased, and costs and weight can also be reduced.

In addition, in this embodiment, an example was shown in which the shell 21 is applied to a horizontal compressor in which the central axis extends in the horizontal direction, but the present invention is not limited to this, and the shell 21
The present invention can also be applied to a vertical expansion compressor in which the central axis extends in the vertical direction in the same manner as in the embodiment.

Incidentally, in the present invention, when the main shaft 26 is rotated by the motor 4 in the direction shown by arrow A in FIG.
9 rotate in the same direction and the oil pump 32 is driven, so that each sliding portion (each bearing) is forcibly supplied with oil. That is, as shown by the broken line arrow in FIG.
The oil in the oil reservoir 22 that has been sucked into the housing 39 passes through the joint 29 and the main shaft 26 in order, and is forcibly supplied to each sliding portion (bearing) of the compression mechanism 5.

〔Effect of the invention〕

As explained above, according to the present invention, a positive displacement pump for forcibly lubricating each bearing is connected to the main shaft rotated by a motor, a housing for accommodating this pump is provided in a sealed container, and this housing is used for oil suction. A first housing has an insertion hole through which a pipe body for the pump is inserted, and a second housing is held by the first housing and connected to the pipe body to rotatably support the pump. Since the main shaft is held so as to be adjustable in the axial and radial directions with respect to one housing, each bearing of the compression mechanism can be forcibly oiled by an oil pump during operation. Therefore, it is possible to ensure a sufficient amount of oil for each bearing, thereby increasing performance in oiling the bearings. Also, when aligning the axes of the drive shaft and main shaft of the oil pump during assembly, the second
Since assembly errors can be absorbed by adjusting the housing in the axial and radial directions of the main shaft, the compressor can be easily assembled.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing the main parts of a lubricating device for a hermetic rotary compressor according to the present invention, and FIG. 2 is a cross-sectional view showing an example in which the lubricating device of the present invention is implemented in a hermetic rotary compressor. ,
FIG. 3 is a sectional view showing a conventional oil supply device for a hermetic rotary compressor. 4...Motor, 5...Compression mechanism, 21...
Shell, 22...Oil sump, 26...Main shaft, 29
...jitsuinto, 32...oil pump, 33
... Pump housing, 36 ... Pipe body, 38 ...
...first housing, 39...second housing,
40...Third housing, 42.Protrusion, 43...
·spring. Agent Masuo Oiwa Figure 1 4t: Piquet 43, F, 7° link

Claims (1)

[Claims] In an oil supply device for a closed rotary compressor, which includes a closed container having an oil reservoir at the bottom, a main shaft provided in the closed container and rotated by a motor, and a compression mechanism connected to the main shaft to compress fluid. A positive displacement pump for forcibly lubricating each bearing is connected to the main shaft, a housing for accommodating the pump is provided in the airtight container, and the housing has an insertion hole through which an oil suction pipe is inserted. a second housing that is held by the first housing, is connected to the tube body, and rotatably supports the pump, and the second housing is oriented in the axial direction of the main shaft relative to the first housing. An oil supply device for a hermetic rotary compressor, characterized in that the oil supply device is held so as to be freely adjustable in the radial direction.