Claims
- 1. A rotary compressor comprising:
- a sealed container defining a plenum;
- a crankshaft rotatable in said sealed container about a horizontal rotary axis;
- a main rotary bearing and an end rotary bearing for said crankshaft;
- compression means including an eccentric piston rotated by said crankshaft, said compression means and said bearing together defining a portion of a compression chamber including high and low pressure chamber portions;
- means for positioning said container so as to define a plenum bottom;
- oil in said plenum bottom for lubricating at least one of said bearings;
- means for introducing gas to be compressed into said low pressure chamber portion;
- a cut shaped oil sump vessel fitted on said end bearing;
- an oil feeding tube extending outside of said container and having one end in fluid communication with said oil sump vessel at a position above said oil in said plenum bottom and a second end inserted in said plenum bottom and in fluid communication with said oil in said plenum bottom;
- a heat exchanger positioned in line in said oil feeding tube and outside of said container for cooling fluid passing therethrough;
- means for providing fluid communication between said second end of said oil feeding tube and said high pressure chamber portion, said means for providing fluid communication having a large diameter portion communicating with said second end of said oil feeding tube;
- at least one oil inducing opening in said means for providing fluid communication, for communicating oil in said plenum bottom with said large diameter portion; and
- an ejecting pipe having one end fitted in a small diameter portion of said means for providing fluid communication and a second end opening into said large diameter portion at a point below said at least one oil inducing opening, said second end of said ejecting pipe communicating with said at least one oil inducing opening via a space gap between said ejection pipe and walls of said large diameter portion, whereby oil entering said at least one oil inducing opening is induced by compressed gas from said ejecting pipe to flow through said oil feeding tube to be cooled and fed to said oil sump vessel for lubricating said compressor.
- 2. The compressor of claim 1 wherein said one end of said oil feeding tube lies in a horizontal plane passing through said rotary axis.
- 3. The compressor of claim 1 wherein said end bearing has an end flange and wherein said sump vessel is press fitted on said flange.
Priority Claims (2)
| Number |
Date |
Country |
Kind |
| 57-150319 |
Aug 1982 |
JPX |
|
| 57-148473[U]JPX |
Sep 1982 |
JPX |
|
Parent Case Info
This is a division of application Ser. No. 519,760, filed Aug. 2, 1983 and now U.S. Pat. No. 4,518,330.
This invention relates to a rotary compressor, and, more particularly, it is concerned with the rotary compressor of a type, in which lubricating oil is cooled by a heat-exchanger for improving the performance and reliability in its operation.
In the conventional compressing machine, particularly, in a compressor of a large capacity, there is an increase in quantity of heat to be generated from various compressing elements in it, whereas quantity of heat to be dispersed does not increase correspondingly, with the consequence that the temperature of the compressing machine as a whole goes up. On account of this, there take place not only preheating of intake gas, deterioration in sealing against leakage of lubricating oil, lowering in operating efficiency of electric motor, etc. to thereby cause decrease in the operational performance of the compressor, but also lowering of the film sustaining force of the lubricating oil, deterioration in the insulating material for the electric motor, etc., all of which resulted in decrease in operational reliability of the machine.
Therefore, with a view to increasing the discharging quantity of heat from the compressor, there have been employed various means such as an oil cooler, and so forth. In the conventional oil cooler, however, since a part of its coolant circuit is drawn into a tightly sealed container, tubing and assembly in the sealed container interior and at the side of a unit using such compressor becomes complicated resulting in increased manufacturing cost.
The present invention aims at improving those disadvantages inherent in the conventional compressor so as to provide such a compressing machine which can be assembled readily and has excellent operational performance and reliability.
It is another object of the present invention to provide a compressor with its performance being improved by cooling the lubricating oil in the compressor through a heat-exchanger installed outside the sealed container, and, after cooling, returning the same into the sealed container.
It is another object of the present invention to provide an improved compressor of a construction, in which the lubricating oil is forwarded to a heat-exchanger by use of pressure exerted at the time of discharging the coolant gas.
According to one aspect of the present invention, there is provided a rotary compressor which comprises: a compression chamber defined by enclosing both ends of a cylinder with a main bearing and an end bearing; compression elements including a piston which is eccentrically rotated by a crank shaft within the compression chamber, and dividing the compression chamber into a high pressure chamber and a low pressure chamber; and a sealed container to form a plenum space, in which the compression elements are housed and lubricating oil is sumped at the inner bottom section of the sealed container to effect lubrication of sliding parts of the compression elements, wherein the lubricating oil is returned into the sealed container after it has been cooled through a heat-exchanger provided outside the sealed container.
According to another aspect of the present invention, there is provided a horizontal type rotary compressor, which comprises: a compression chamber defined by enclosing both ends of a cylinder with a main bearing and an end bearing; compression elements including a piston which is eccentrically rotated by a crank shaft within the compression chamber, and dividing the compression chamber into a high pressure chamber and a low pressure chamber; and a sealed container to form a plenum space, in which the compression elements are housed and lubricating oil is sumped at the inner bottom section of the sealed container to perform lubrication of sliding parts of the compression elements, wherein there are further provided a communicating port formed in said cylinder so as to introduce discharged coolant gas from the compression chamber; a large diameter section of said communicating port, which is expanded in the lubricating oil; an ejecting pipe, one end of which is inserted into said communicating port and opened in said large diameter section thereof; and an oil inducing path which intersects orthogonally with said large diameter section and passes through said cylinder, the lubricating oil being let out of said oil inducing path, being caused to pass through a heat-exchanger provided outside said sealed container together with the discharged gas, and being returned into the sealed container.
US Referenced Citations (7)
Foreign Referenced Citations (5)
| Number |
Date |
Country |
| 22035 |
Jun 1972 |
JPX |
| 87512 |
Jul 1975 |
JPX |
| 153518 |
Dec 1978 |
JPX |
| 123391 |
Sep 1980 |
JPX |
| 382227 |
Oct 1932 |
GBX |
Non-Patent Literature Citations (3)
| Entry |
| J2291A/42=U.S. Pat. No. 4,131,396, "Refrigerant Compressor Two Stage Oil Pump-Has Inlet to Second Stage Concentric with Inlet to First State". |
| E7782A/2S=DT 2805255, "Silent Sealed Refrigerator Unit-Has Compressor Rotor Enclosed by Motor Stator and Flanged End Cap Sealed by Ring". |
| K43044/47=GB 1542550, "Noise Damped Refrigerator for Air Conditioning Plant-Has Lubrication Oil Pumping Systems for Reducing Noise Transmission by Oil". |
Divisions (1)
|
Number |
Date |
Country |
| Parent |
519760 |
Aug 1983 |
|
Patent Grant
4569645
