JPH0144792Y2 - - Google Patents

Description

[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) The present invention relates to an oil pump cover structure for a hermetic compressor, and in particular prevents the accumulation of wear particles and improves the connection between the drive shaft and sub-bearing. This invention relates to a hermetic compressor that prevents galling and improves lubrication performance, thereby increasing the reliability of the compressor as much as possible.

(Prior Art) As a hermetic compressor, a vertical type compressor is known in which a compression section is disposed below an electric section, and an output shaft of the electric section and a drive shaft of the compression section are formed identically. The drive shaft is provided along the vertical direction and is rotatably supported by a main bearing and a sub-bearing. Further, an oil pump is provided at the lower end of the drive shaft to supply lubricating oil to the compression section.

Conventionally, an oil pump 1 includes a drive shaft 2 having a through hole 3 formed along its longitudinal direction as shown in FIG. is fitted into the closed casing, and the lower end 2a of the drive shaft 2 is immersed in lubricating oil stored at the bottom of the sealed casing. When the drive shaft 2 is driven to rotate, the rotating body 4 rotates, and this rotation gives centrifugal force to the lubricating oil, which is sucked up into the through hole 3 from the suction port 5, and the lubricating oil is sucked up into the through hole 3 through the suction port 5. Oil is supplied to the sliding parts, etc.

The one shown in FIG. 1 is disclosed in Japanese Patent Application Laid-Open No. 139104/1983, and in this known one, the drive shaft 2 is attached to the lower end 2a of the drive shaft 2.
And an oil pump cover 7 that covers the oil pump 1 is provided. This oil pump cover 7
When the drive shaft 2 is driven to rotate, its lower end 2a
The nearby lubricating oil flows due to its viscosity and creates a vortex.
This vortex is provided to prevent a cavity from being formed below the suction port 5, and ensures the amount of lubricating oil sucked from the suction port 5.

The lubricating oil sucked up from the suction hole 8 of the oil pump cover 7 moves upward in the through hole 3 due to centrifugal force, and moves between the oil pump cover 7 and the drive shaft 2.
In the space formed between the rotating drive shaft 2 and the lower end surface of the rotating drive shaft 2 and the viscosity of the lubricating oil, the drive shaft 2 receives centrifugal force and moves radially outward.

(Problem that the invention aims to solve) However, there are wear particles in the lubricating oil, and since these wear particles have a higher specific gravity than the lubricating oil, a larger centrifugal force is generated, causing them to move outward in the radial direction. The oil is washed away and accumulated in the space between the oil pump cover 7 and the drive shaft 2. Furthermore, this accumulated wear powder is caused between the drive shaft 2 and the sub-bearing 6.
This caused problems such as galling.

In addition, in an oil groove (not shown) formed in the sub-bearing 6 to supply lubricating oil to the outer circumferential wall of the drive shaft 2, lubricating oil flows downward from above and is supplied from above. There is a problem in that the flowing lubricating oil collides with the above-mentioned flow of lubricating oil outward in the radial direction and the flow is obstructed, thereby impairing the lubricating performance.

In addition, in this type of hermetic compressor,
Publication No. 53-10683 proposes a ``lubricating device for a compressor unit driven by an electric motor.''
This proposal involves forming a relief groove connected to the eccentric path on the thrust surface of the thrust bearing that supports the drive shaft, which has an eccentric path. , there is a problem that wear powder must be discharged intermittently, and the wear powder is removed from lubricating oil after lubrication.
This has the disadvantage that wear particles enter the drive shaft and cause galling.

The present invention was devised to effectively solve the conventional problems as described above, and its purpose is to prevent the accumulation of wear debris and to enable continuous discharge of wear debris. Another object of the present invention is to provide a hermetic compressor that can prevent galling between a drive shaft and a sub-bearing and improve lubrication performance.

[Structure of the invention] (Means for solving the problem) In order to achieve the above object, the present invention provides a compression part below the electric part, and a drive shaft for driving the compression part is provided along the vertical direction. In a hermetic compressor, the lower end of the drive shaft is provided with an oil pump for supplying lubricating oil to the compression section, and an oil pump cover is provided to cover the oil pump. An oil pump cover is provided with a space separated from the lubricant, and a suction hole is formed in the axial center of the oil pump cover to face the oil pump and suck in the lubricating oil, and the lubricant is centrifuged from the suction hole. A discharge hole is formed at the position of the oil pump, and the wear powder introduced into the space is centrifugally separated by centrifugal force, and the wear powder is removed at the inlet side of the oil pump. .

(Embodiment) A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

In FIG. 2, 10 is a compression section provided below the electric section (not shown), and the electric section and compression section 1
A drive shaft 11 that drives the compression section 10 by connecting the
are provided along the vertical direction. Drive shaft 1
1 is rotatably supported by a main bearing 13 and a sub-bearing 14 that are integrally formed on the upper and lower walls of the cylinder 12. A roller 16 that moves eccentrically within the cylinder 12 to compress refrigerant gas within the cylinder 12 is fitted into the eccentric portion 15 of the drive shaft 11 .
Further, an oil pump 17 is provided at the lower end of the drive shaft 11 to supply lubricating oil to each sliding portion between the drive shaft 11, the main bearing 13, the sub-bearing 14, and the rollers 16.

That is, a through hole 18 is formed in the drive shaft 11 along its longitudinal direction or in the vertical direction, and a rotating body 19 formed by twisting a plate spring member into a spiral shape is fitted into the through hole 18 . The through hole 18 has
The lubricating oil sucked up by centrifugal force is transferred to the drive shaft 11.
Oil holes 20, 21, and 22 are formed radially outward from these holes in order to supply oil to each sliding portion of the main bearing 13, sub-bearing 14, and roller 16. The rotating body 19 is supported and fixed within the through hole 18, and is connected to the drive shaft 1.
Rotationally driven with the rotation of 1.

An oil groove 23 is formed in the inner circumferential wall of the sub-bearing 14 to supply lubricating oil to the outer circumferential wall of the drive shaft 11 .

Note that the lower ends of the drive shaft 11 to the rotating body 19 are immersed in lubricating oil stored at the bottom of a sealed casing (not shown).

At the lower end of the oil pump 17 are a drive shaft 11 and a sub bearing 14 exposed in lubricating oil as shown in the figure.
An oil pump cover 24 is provided to cover the lower end of the oil pump 17 with a space spaced therebelow by a predetermined distance. As shown in Figure 3, a suction hole 25 for sucking lubricating oil is formed in the center, and at the distal part of the suction hole 25, lubricating oil is sucked in from the suction hole 25 and flowed out radially outward due to centrifugal force. A discharge hole 26 is formed to discharge lubricating oil and wear powder into the sealed casing, and the opening area of this discharge hole 26 is equal to that of the suction hole 2.
The opening area is smaller than that of No. 5. (The discharge hole 26 is preferably formed at the peripheral edge of the oil pump cover 24.) The oil pump cover 24 also includes a secondary bearing 14 that is supported and fixed to the secondary bearing 14 at a predetermined distance from the lower end surface thereof. A locking protrusion 27 is formed which is raised and folded back to the side.
In this embodiment, the locking protrusion 27 is
The oil pump cover 24 is formed along the circumferential direction on the peripheral edge of the oil pump cover 24, which abuts against the lower end surface of the oil pump cover 24 and forms the space A.

Next, the operation of the present invention will be described.

When the drive shaft 11 is driven to rotate, the rotating body 19 rotates, and the suction hole 25 is rotated as shown in FIG.
It sucks up the lubricating oil stored at the bottom of the sealed casing. The lubricating oil sucked in through the suction hole 25 is pressurized by the rotating body 19 and moves upward in the through hole 18, passing through the oil holes 20, 21, and 22 to the drive shaft 11, main bearing 13, sub bearing 14, and rollers. 16
Oil is supplied to each sliding part.

On the other hand, in the space formed between the oil pump cover 24 and the lower end surface of the drive shaft 11, lubricating oil sucked from the suction hole 25 is introduced, and this lubricating oil has a viscosity and a It moves radially outward under centrifugal force from the lower end surface, and is continuously returned to the inner bottom of the sealed casing through the discharge hole 26. At this time, wear particles and the like present in the lubricating oil are continuously discharged from the discharge hole 26 together with the lubricating oil. Therefore, it is possible to prevent wear powder from accumulating in the space between the oil pump cover 24 and the drive shaft 11. Therefore, the wear powder is not introduced into the oil pump 17, and the drive shaft 11 There is no risk of galling between the bearing and the secondary bearing 14.

In addition, the lubricating oil moving radially outward is transferred to the discharge hole 2.
Since I returned it to the inner bottom of the casing from 6,
Due to this radially outward flow, the lubricating oil flowing downward from above in the oil groove 23 flows smoothly without being hindered, and is supplied to the outer circumferential wall of the drive shaft 11.
Therefore, the lubrication performance can be improved and the reliability of the compression section can be increased as much as possible.

Therefore, in this embodiment, the following effects can be achieved.

(1) It is possible to prevent wear particles from accumulating in the space formed between the oil pump cover and the drive shaft, and it is possible to prevent galling between the drive shaft and the bearing. Further, the wear powder introduced into the space can be continuously discharged to the outside of the oil pump cover, and the wear powder can be easily and reliably discharged.

(2) Since abrasion powder is centrifuged at the bottom of the oil pump, lubricating oil from which abrasion powder has been removed can be supplied to the oil pump, and galling of sliding parts can be prevented.

(3) Lubricating the drive shaft can be carried out smoothly and lubrication performance can be improved.

[Effects of the Invention] As is clear from the above explanation, the present invention provides the following excellent effects.

Abrasion powder in the lubricating oil circulating in a hermetic compressor can be removed before the oil pump suction port, making it possible to improve the reliability of sliding parts such as drive shafts and bearings as much as possible. . Therefore, the reliability of the compressor can be improved as much as possible, and the structure is simple and practical.

[Brief explanation of drawings]

Fig. 1 is a sectional side view of the main part showing the oil pump cover structure of a conventional hermetic compressor, Fig. 2 is a sectional side view of the main part showing a preferred embodiment of the present invention, and Fig. 3 is a sectional side view of the main part showing the oil pump cover structure of a conventional hermetic compressor. The plan view shown in FIG. 4 is a sectional side view of a main part showing the flow of lubricating oil. In the figure, 10 is a compression part, 11 is a drive shaft, 17 is an oil pump, 24 is an oil pump cover, 25 is a suction hole, and 26 is a discharge hole.

Claims (1)

[Scope of utility model registration request] A compression section is provided below the electric section, a drive shaft for driving the compression section is provided along the vertical direction, and an oil pump is provided at the lower end of the drive shaft for supplying lubricating oil to the compression section. In a hermetic compressor provided with an oil pump cover that covers the oil pump, the oil pump cover is provided at the lower end of the oil pump with a space spaced apart by a predetermined distance;
A closed type compression characterized in that the oil pump cover has a suction hole facing the oil pump and sucking the lubricating oil formed in the axial center thereof, and a discharge hole formed at a position centrifugal from the suction hole. Machine.