JP2672615B2 - Rotary compressor - Google Patents

Description

TECHNICAL FIELD The present invention relates to a rotary compressor used in a refrigerator or the like.

2. Description of the Related Art In recent years, rotary compressors are widely used in refrigerators and the like, and are required to have higher efficiency.

An example of the conventional rotary type described above will be described below with reference to the drawings.

FIG. 4 shows a sectional structure of a conventional rotary compressor, and FIG.
The figure shows the internal structure of the cylinder.

In FIGS. 4 and 5, 1 is a hermetic container, and 2 is a motor which is housed in the hermetic container and comprises a stator 2a and a rotor 2b. Reference numeral 3 denotes a crankshaft fixed to the rotor 2b, which is composed of a sub shaft portion 3a, an eccentric portion 3b, a main shaft portion 3c and an oil groove 3d. Reference numeral 4 denotes an anti-motor side plate, and 5 denotes a motor side plate, which support the crankshaft 3 respectively. Reference numeral 6 denotes a roller fitted in the eccentric portion 3b of the crankshaft 3 and freely rotatable by the crankshaft 3, and 7 denotes a cylinder for housing the roller 6. Reference numeral 8 is a vane that partitions the inside of the cylinder into a suction side and a compression side. Reference numeral 9 is an oil supply pipe press-fitted into the counter motor side plate 4, and reference numeral 10 is a closely wound oil supply spring screwed to the tip of the crankshaft 3. Reference numeral 11 is refrigerating machine oil sealed in the closed container, and 12 is a suction pipe press-fitted into the non-motor side plate 4.

The operation of the rotary compressor configured as described above will be described below.

The crankshaft 3 is rotated by the drive of the motor 2, and the refrigerating machine oil is transferred from the tips of the oil supply pipe 9 and the oil supply spring 10 located in the refrigerating machine oil 11 to the oil groove 3d of the crankshaft 3 along the inner wall of the oil supply pipe 9. Be refueled.

Further, as the crankshaft 3 rotates, the roller 6 fitted in the eccentric portion 3b of the crankshaft 3 rotates, and the inside of the cylinder is partitioned by the vane 8 pressed against the roller 6, so that the suction pipe 12 The inhaled gas is continuously compressed.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the above-described configuration, the spiral oil groove 3d of the crankshaft 3 applies a load of 1 to the crankshaft.
When it is formed at the maximum per rotation, the load per unit area increases, and there are problems such as a decrease in efficiency due to an increase in sliding resistance and occurrence of wear.

In view of the above problems, the present invention provides a rotary compressor that has a small sliding resistance between the crankshaft and the bearing portion and a small reduction in efficiency.

Means for Solving the Problems In order to solve the above problems, in the rotary compressor of the present invention, the oil groove on the auxiliary shaft portion side of the crankshaft is 60 in the counter-rotational direction of the crankshaft with reference to the eccentric direction of the crankshaft. It is formed so as to avoid the range of up to 160 °, and the oil groove of the main shaft portion is also spirally formed in the same direction.

Effect The present invention has the above-mentioned configuration to form the oil groove outside the range of the maximum load position applied to the crankshaft, so that the load per unit area is reduced in both the sub-bearing portion and the main bearing portion, and the oil Since the groove has a spiral shape in the same direction in the auxiliary bearing portion and the main bearing portion, the propulsion force of the refrigerating machine oil becomes strong.

Example Hereinafter, a rotary compressor according to an example 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.

FIG. 1 shows a sectional structure of a rotary compressor according to an embodiment of the present invention, and FIG. 2 shows a crankshaft having an oil groove according to an embodiment of the present invention taken along the line BB ′ in FIG. It is the figure seen. It should be noted that this embodiment describes a horizontal rotary compressor, but it goes without saying that a vertical type compressor also has similar effects. FIG. 3 shows the relationship between the load applied to the auxiliary shaft portion of the crankshaft and the angle of the crankshaft, which is calculated.

In FIG. 1 and FIG. 2, 13 is a crankshaft in which an oil groove 13d of one embodiment of the present invention is formed, and the oil groove 13d of the sub-shaft portion 13a is based on the eccentric direction of the crankshaft 13 It is formed so as to avoid the range of 60 to 160 ° in the opposite rotation direction, and the oil groove 13d of the main shaft portion 13c is also formed spirally in the same direction. In FIG. 2, the range in which the oil groove of the present invention is not formed is clearly shown as between CC '. The reason why the oil groove is not formed between C-C 'is that, as can be seen from FIG. 3, the load applied to the sub-shaft portion is maximum between 60 ° and 160 ° of the crankshaft. No oil groove shall be formed between them.

In the above structure, since the oil groove is formed outside the range of the maximum load applied to the crankshaft, the load per unit area is reduced in the sub-bearing portion and the main bearing portion, and the oil groove serves as the sub-bearing portion. Since the main bearing has a spiral shape in the same direction, the propulsion force of the refrigerating machine oil becomes strong.

Therefore, the sliding resistance between the crankshaft and the bearing portion is reduced, and it is possible to provide a rotary compressor with less efficiency reduction.

EFFECTS OF THE INVENTION As described above, the present invention forms spiral oil grooves in the same direction in the auxiliary shaft portion and the main shaft portion of the crankshaft, and the oil groove in the auxiliary shaft portion is used as a reference based on the eccentric direction of the crankshaft. By forming it so as to avoid the range of 60 to 160 ° in the counter-rotational direction of the shaft, the oil groove is formed outside the range of the maximum load position applied to the crankshaft, so the load per unit area is the auxiliary bearing part and the main bearing part. However, since the oil groove has a spiral shape in the same direction in the sub-bearing portion and the main bearing portion, the propelling of the refrigerating machine oil becomes strong, and therefore the sliding resistance between the crankshaft and the bearing portion decreases, It is possible to provide a rotary compressor with less efficiency reduction.

[Brief description of the drawings]

FIG. 1 is a sectional view of a rotary compressor according to an embodiment of the present invention, FIG. 2 is an enlarged view of a crankshaft seen from the BB ′ plane in the compressor, and FIG. 3 is a subshaft of the crankshaft. FIG. 4 is a sectional view of a conventional rotary compressor, and FIG. 5 is a sectional view taken along the line AA ′ of FIG. 1 ... Airtight container, 2 ... Motor, 2a ... Stator, 2b ...
Rotor, 4 ... Motor side plate, 5 ... Anti-motor side plate, 6 ... Roller, 7 ... Cylinder, 8 ... Vane, 13 ... Crank shaft, 13a ... Sub-shaft section, 13b ... Eccentricity Part, 13c ... spindle part, 13d ... oil groove.

Claims (1)

(57) [Claims] Claim: What is claimed is: 1. A motor having a stator and a rotor in a closed container, a crankshaft composed of a sub-shaft part, a main shaft part and an eccentric part which are rotated by the motor, a cylinder forming a compression chamber, and a cylinder. The motor side plate and the non-motor side plate that are in close contact with both sides of the inner side of the compression chamber,
It has a compression element composed of an eccentrically rotating roller and a vane whose tip portion is in pressure contact with the roller to partition the compression chamber into a high pressure side and a low pressure side. The auxiliary shaft portion and the main shaft portion of the crankshaft respectively have spirals in the same direction. -Shaped oil groove is formed, and the oil groove on the side of the auxiliary shaft is formed so as to avoid the range of 60 to 160 ° in the counter-rotational direction of the crankshaft with reference to the eccentric direction of the crankshaft. Type compressor.