JPS5823035Y2 - rotary compressor - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement of an oil supply mechanism for a rotary compressor.

Since the eccentricity of the crankshaft of a rotary compressor is smaller than that of a reciprocating compressor, the diameter of the crankshaft is generally small in order to reduce friction loss.

Also, a centrifugal pump type oil supply system is usually adopted, and this has sufficient head and flow rate for small compressors.

However, in recent large-scale compressors, centrifugal pumps alone have insufficient head and flow rate, and to solve this problem, spiral oil vanes are provided within centrifugal pumps.

However, the lubricating oil inside the centrifugal pump usually rotates at a speed slightly slower than the rotational speed of the crankshaft due to viscous resistance.

Therefore, even if oil vanes are provided within the centrifugal pump, the head and flow rate will only increase slightly.

The present invention aims to improve the above-mentioned drawbacks and obtain sufficient head and flow rate.An embodiment of the present invention will be described below with reference to the drawings.

In the figure, 1 is a closed container, into which a cylinder 2 of a compression element is press-fitted and fixed.

A crankshaft 5 is provided within the cylinder 2 and has a piston 4 rotatably housed in an eccentric portion 3.

An upper bearing 6 and a lower bearing 6' are fixed to the upper and lower ends of the cylinder 2 to form a compartment 7.

A blade (not shown) is provided in the compartment 7, and this blade is always urged by a blade spring so as to be in contact with the piston 4, and divides the compartment 7 into a high pressure chamber and a low pressure chamber, and the blade is connected to the crankshaft 5. The compression action is performed by rotation of an electric element (not shown) directly connected to the compressor.

On the other hand, the lower end of the crankshaft 5 is connected to the small diameter portion 6a' of the lower bearing 6'.
The horizontal part 8 of the two-stage cylindrical oil supply cylinder 8 is located at the outer edge of the small diameter part 6a' of the lower bearing 6'.
The inner surface of a is press-fitted and fixed to the lower end of the crankshaft 5 with a slight gap.

The small diameter d of the hollow part of the oil supply cylinder 8 is made slightly larger than the diameter of the hollow part of the crankshaft 5, and a spiral oil vane 9 is lightly press-fitted into the hollow part of the crankshaft 5. The lower end 9 is provided so as to protrude from the lower end of the crankshaft 5 and further extend into the oil supply cylinder 8 .

Therefore, due to the rotation of an electric element (not shown) directly connected to the crankshaft 5, the lubricating oil sucked from the lower end of the oil supply tube 8 by the pumping action of the oil vanes 9 flows through the oil supply holes 10, 10' provided in the crankshaft 5. What passes through them mainly lubricates the lower bearing C, what passes through the oil supply hole 11 mainly lubricates the piston 4, and what passes through the oil supply holes 12 and 12' mainly lubricates the upper bearing 6.

FIG. 2 shows another embodiment, in which instead of a two-stage cylindrical oil supply cylinder, a sleeve-shaped oil supply pipe is installed on the inner surface of the extension part 13 extending beyond the lower end of the lower bearing 67 and the crankshaft 5. Tube 8
Furthermore, the two-stage cylindrical oil supply cylinder shown in FIG. 1 may be integrally cast, sintered, or die-cast with the lower bearing 6''.

As described above, in the rotary compressor of the present invention, the lower end of the crankshaft is slightly shorter than the lower end of the bearing, a two-stage cylindrical oil supply tube is press-fitted into the stationary bearing, and the hollow part of the oil supply cylinder is fixed. The small diameter is slightly thicker than the diameter of the hollow part of the crankshaft, and the spiral oil blades are installed so that they protrude from the lower end of the shaft and extend into the oil supply cylinder, so the oil blades in the oil supply cylinder are completely filled. The oil pumped up in this part can be smoothly guided and drawn into the oil vanes that help the oil rise within the crankshaft, so the pumping action of the oil vanes is extremely large and there are many It has great practical value, as it can provide a high flow rate and a high head, has a simple structure, is easy to assemble, and is low in cost.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of a rotary compressor according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of essential parts of a rotary compressor according to another embodiment of the present invention. 2...Cylinder, 5...Crankshaft,
6... Upper bearing, 6', 6"... Lower bearing, 8, 8'... Oil supply pipe, 9... Oil vane, d... ...Hollow part small diameter, D...
Hollow diameter.

Claims (1)

[Scope of utility model registration request] Upper and lower bearings for supporting a crankshaft are provided at the upper and lower ends of a cylinder constituting a compression element, the lower end of the crankshaft is slightly shorter than the lower end of the lower bearing, an oil supply tube is provided in the lower bearing, and the oil supply The small diameter of the hollow part formed in the cylinder is configured to be slightly larger than the diameter of the hollow part formed in the crankshaft.
A rotary compressor further comprising a spiral oil vane inserted so as to span the crankshaft and the hollow portion of the oil supply tube.