JP2583977B2 - Hermetic rotary compressor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a horizontal hermetic rotary compressor used in a refrigeration system.

2. Description of the Related Art In recent years, hermetic rotary compressors have tended to improve structural specifications to reduce energy consumption and improve reliability.

Hereinafter, an example of a conventional hermetic rotary compressor will be described with reference to the drawings.

FIG. 4 is a hermetic rotary compressor disclosed in Japanese Utility Model Publication No. Sho 63-1019. Reference numeral 1 denotes a conventional hermetic rotary compressor, in which an electric motor comprising a stator 3 and a rotor 4 in a hermetically sealed container 2. The housing 5 houses a compression section 8 driven by the motor section 5 and the crankshaft 6. The compression unit 8 includes a rolling piston 10 in a cylinder 9, a crankshaft 7 for eccentrically rotating the rolling piston 10, a vane (not shown) separating a high pressure chamber and a low pressure chamber, a bearing 11 for bearing the crankshaft 7, and a cylinder head 12. Consists of Reference numeral 13 denotes an oil pump, which is provided in the oil A (15a) stored in the inner bottom portion 14 of the closed container 2 for a pipe A17 communicating with the discharge muffler 16 and a cylindrical hollow portion 18 in the axial direction of the crankshaft 7. The communicating large diameter pipe B19 is connected with an opening 20. Reference numeral 21 denotes an oil hole, which is a sliding portion 22 of the compression portion 8 extending from the hollow portion 18.
Is in communication with 23 is a gas (indicated by an arrow) discharged from the cylinder 9.

In the above-described configuration, when power is supplied to the electric motor unit 5, the rotor 4 rotates and the crankshaft 7 rotates at the same time, and the compression unit 8 performs a compression operation. The gas 23 (indicated by an arrow) discharged from the cylinder 9 passes through the discharge muffler 16 and is guided to the pipe A17, and the pipe A17 is contained in the oil A (15a) stored in the inner bottom portion 14 of the closed container 2. Because it is connected to the large-diameter pipe B19,
Due to the ejector effect, the oil A (15a) is supplied from the opening 20 to the hollow portion 18 in the crankshaft 7 through the pipe B19, and is supplied to the sliding portion 22 through the oil hole 21.

However, in the above configuration, when the hermetic rotary compressor 1 is stopped during the cycling operation (ON-OFF operation) of the hermetic rotary compressor 1, the crankshaft 7 is stopped during operation. Oil B (15b) filled in the hollow part 18 in the inside
Flows down to the inner bottom portion 14 of the closed container 2. Next, when the hermetic rotary compressor 1 is restarted, the oil A (15a) is again supplied to the hollow portion 18 of the crankshaft 7 by the gas 23 discharged from the cylinder 9, but the crankshaft 7 rotates. After the compression operation is started, oil A
It takes 1 to 2 seconds for (15a) to be refueled, during which time it will be operated without lubrication, resulting in poor starting, increased input during starting, and the There has been a problem of causing abnormal wear and lowering the reliability of the hermetic rotary compressor.

In view of the above problems, the present invention provides a recessed oil reservoir in a hollow portion in a crankshaft to store oil,
An object of the present invention is to provide a hermetic rotary compressor for initial lubrication at restart.

Means for Solving the Problems In order to solve the above problems, the hermetic rotary compressor of the present invention is provided on an inner wall surface of a hollow portion of a crankshaft,
A crankshaft having a concave oil reservoir formed in the crankshaft by inserting a ring-shaped oil stopper having a thickness in the outer peripheral direction lightly and sealing the outer periphery of the oil stopper and the inner wall surface. Things.

Effect of the Invention With the above configuration, the present invention allows the oil B in the hollow portion of the crankshaft to flow into the hollow portion of the crankshaft without causing the oil in the hollow portion of the crankshaft to flow to the inner bottom of the closed container when the closed rotary compressor is stopped. When the oil B is used to restart the hermetic rotary compressor, the oil is used to initially supply the sliding portion of the compression portion with the oil B, thereby causing poor starting, an increase in input at the time of starting, and an increase in the sliding portion. It prevents abnormal wear.

Embodiment Hereinafter, a hermetic rotary compressor according to an embodiment of the present invention will be described with reference to the drawings. The same parts as those in the conventional example will be described using the same reference numerals, and the same components and operations will be omitted.

1 to 3, reference numeral 31 denotes a hermetic rotary compressor of the present invention, which is a crankshaft 7 corresponding to the compression section 8 side.
A hollow portion 18 having a cylindrical inner wall surface 32 having a large diameter in the axial direction of the crankshaft 7 is formed therein, and a distal end of the hollow portion 18 on the opposite side to the electric motor portion 5 is formed in a circumferential direction. A ring-shaped oil stopper 33 having a thickness and a diameter slightly larger than the cylindrical diameter of the hollow portion 18 is lightly inserted, and a circumferential circumferential surface 33a of the oil stopper 33 and an inner wall surface 32 are provided. Are formed in the crankshaft 7 to form a recessed oil reservoir 34 in which oil B (15b) is stored.

In the above configuration, when the hermetic rotary compressor 31 is stopped, all the oil B (15b) in the hollow portion 18 is closed.
The oil B (15b) does not flow down to the inner bottom portion 14 of the
Is stored. Next, when the hermetic rotary compressor 31 is restarted, the oil B (15b) in the oil sump 34 is initially supplied to the sliding portion 22 through the oil hole 21 by centrifugal force. Thereafter, the oil A (15a) is supplied to the hollow part 18 by the ejector gas by the ejector effect.

Therefore, it is possible to provide a hermetic rotary compressor having high energy consumption and high reliability, which can reduce the start failure of the hermetic rotary compressor, increase input at the time of starting, and reduce abnormal wear of the sliding portion. .

Effect of the Invention As described above, the present invention is to insert a ring-shaped oil stopper light pressure having a thickness in the circumferential direction into the inner wall surface of the hollow portion of the crankshaft to seal the outer periphery and the inner wall surface of the oil stopper. By providing a recessed oil sump in the crankshaft, oil remaining in the oil sump moves to the sliding part of the compression part with the rotation of the crankshaft when the hermetic rotary compressor restarts. Initial refueling reduces the start-up failure of the hermetic rotary compressor, increases input during start-up, and reduces abnormal wear of the sliding parts, providing a high-energy and reliable hermetic rotary compressor. can do.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of a main part of a hermetic rotary compressor according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of the hermetic rotary compressor of FIG. 1, and FIG. FIG. 4 is a perspective view of a conventional oil-sealed rotary compressor, and FIG.
The figure is a cross-sectional view from the compression part side in FIG. 2 ... closed container, 3 ... stator, 4 ... rotor, 5 ...
... Electric motor part, 7 ... Crank shaft, 8 ... Compression part,
18 ... hollow part, 31 ... hermetic rotary compressor, 32 ... inner wall surface, 33 ... oil stopper, 34 ... oil sump.

Claims (1)

(57) [Claims] An electric motor unit comprising a stator and a rotor;
Along with housing the motor section and a compression section driven through a crankshaft having a cylindrical hollow section formed in the axial direction in a closed container, the inner wall surface of the hollow section of the crankshaft is arranged in a circumferential direction. A ring-shaped oil stopper having a thickness is lightly inserted, the outer periphery and the inner wall surface of the oil stopper are sealed, and a crankshaft having a recessed oil reservoir formed in the crankshaft is provided. Hermetic rotary compressor.