JP2956736B2 - Hermetic rotary compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic rotary compressor incorporated in a refrigerating apparatus such as a refrigerator, and more particularly to a hermetic rotary compressor in which the crankshaft is mounted so as to be positioned substantially horizontally.
The present invention relates to a technique for performing smooth lubrication.

[0002]

2. Description of the Related Art In recent years, in the refrigeration and air conditioning industry, hermetically sealed
Tari compressors have become very popular in the market. Particularly in refrigerators and the like, a horizontal type, which can reduce the space in a machine room for housing a compressor, has become mainstream.

[0003] Referring to the accompanying drawings,
An example of a conventionally known hermetically sealed rotary compressor as disclosed in Japanese Patent Publication No. 7994 or the like will be described. FIG. 4 is a sectional view of a conventional hermetic rotary compressor. In FIG. 4, reference numeral 1 denotes a closed type rotary compressor main body, in which a motorized element 3 and a compression element 4 are integrally accommodated in a closed container 2. Reference numeral 3a denotes a stator of the electric element 3, which is press-fitted and fixed to the closed container 2. 3b is a rotor. Reference numeral 5 denotes a side plate integrally having a main bearing 5a for supporting the crankshaft 6 press-fitted into the rotor 3b.

[0004] The crankshaft 6 is disposed horizontally in the closed container 2. The side plate 5 is fixed by welding or the like after being lightly pressed into the closed container 2. 7
Is a cylinder plate for accommodating the rotating piston 8 provided on the eccentric portion 6a of the crankshaft 6. Reference numeral 9 denotes a side plate integrally having a bearing 9a for supporting the crankshaft 6. The side plate 5, the cylinder plate 7, and the side plate 9 are integrated by bolts 10 to define a compression chamber 11.

Reference numeral 12 denotes a vane for dividing the compression chamber 11 into a high pressure side and a low pressure side, and 12a denotes a vane spring.
Reference numeral 13 denotes a spring guide that is fastened to the bearing 9a by the bolt 10. The spring guide 13 includes an attachment portion 13a fitted to the bearing 9a and an oil pipe 13b bent downward.
The upper end of the oil pipe 13b is connected to an opening 13c provided concentrically with the crankshaft 6 of the mounting portion 13a, and the lower end is immersed in oil 14 stored below the closed container 2. Reference numeral 15 denotes a tightly wound coil spring which is screwed and fixed to a screw portion 6b formed at the end of the crankshaft 6, extends into the oil pipe 13b from the opening 13c, and has a slightly conical throttle portion 15a at the tip. Is formed. The coil spring 15 is connected to the oil pipe 13b.
Has an outer diameter substantially equal to the inner diameter of

Reference numeral 16 denotes the mounting base 13a and the bearing 9a.
And a hydraulic chamber defined by the end face of the crankshaft 6. 6c, 6d and 6e respectively correspond to the bearing 9a, the rotary piston 8 and the crankshaft 6 facing the main bearing 5a.
Is an oil groove provided on the outer peripheral surface. Reference numeral 17 denotes a discharge pipe that guides the discharge gas to a refrigeration cycle (not shown), and reference numeral 18 denotes a suction pipe that directly communicates with the compression chamber from the refrigeration cycle.

In the above configuration, when the electric element 3 is energized and the rotor 3b rotates, the crankshaft 6 rotates, and the rotation of the rotary piston 8 causes the refrigerant gas sucked from the suction pipe 18 into the compression chamber 11 to flow. It is compressed, discharged once into the closed container 2 via a discharge valve (not shown), and sent to the refrigeration cycle via the discharge pipe 17. On the other hand, the rotation of the crankshaft 6 simultaneously rotates the close-wound coil spring 15 in the spring guide 13. By this rotation, the tightly wound coil spring 15 and the oil 14 are formed along the inner wall of the oil pipe 13b by the tightly wound coil spring 15
Rises and reaches the hydraulic chamber 16. Thereafter, the oil in the hydraulic chamber 16 passes through the oil grooves 6c, 6d, 6e,
a, the rotating piston 8, and the main bearing 5a are each lubricated.

[0008]

However, in the above-mentioned conventional construction, the suction pipe is rapidly cooled by the refrigerant gas sucked from the cooler at the beginning of the restart in the intermittent operation state of the hermetic rotary compressor. Therefore, the high-temperature and high-pressure refrigerant gas discharged into the sealed container dew drops on the outer surface of the suction pipe in the sealed container, drops into the oil stored in the lower part of the sealed container, floats, and flows into the oil pipe. Since it is sucked in the refrigerant rich oil state, there is a problem that the lubrication state of the oil pipe and the close-wound spring or the crankshaft and the bearing, the rotating piston and the main bearing is temporarily deteriorated by the foaming phenomenon of the refrigerant in the oil. I was The present invention has been made to solve the conventional problem, and has an object to stabilize a lubricating state of each sliding portion at the time of restart and improve reliability.

[0009]

In order to achieve this object, a sealed rotary compressor according to the present invention has a substantially semi-elliptic cylindrical suction which forms a semi-sealed space with a suction pipe in a sealed container. It has a configuration in which a pipe cover is provided.

[0010]

In the hermetic rotary compressor according to the present invention, by providing the suction pipe cover, it is possible to prevent continuous dewdrops of refrigerant from entering the oil in the suction pipe at the initial stage of restart during intermittent operation. .

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the hermetic rotary compressor according to the present invention will be described below with reference to the drawings. The same parts as those in the conventional example will be described using the same numbers, and the same parts in the configuration and operation will be omitted.

FIG. 1 is a sectional view of a hermetic rotary compressor. 2 is a partial detailed view of FIG. 1, and FIG. 3 is a sectional view taken along line AA 'of FIG. In the figure, reference numeral 22 denotes a suction pipe cover fixed to the side plate 9 together with the suction pipe 18. 2
2a is the suction pipe cover 22 and the suction pipe 18
Is a semi-enclosed space formed underneath. The operation of the hermetic rotary compressor configured as described above will be described below.

The liquid refrigerant overflowing from the cooler in the early stage of restart of the hermetic rotary compressor evaporates, but a part thereof reaches the suction pipe and is sucked into the compression chamber. At this time, the suction pipe is cooled to a temperature not higher than the condensation temperature of the high-pressure refrigerant gas in the closed vessel, so that the refrigerant gas around the suction pipe dew drops on the suction pipe surface and is reduced in pressure.

Although the dew drops of the refrigerant gas are dropped to the lower part by their own weight, they are dropped into a substantially semi-elliptic cylindrical suction pipe cover 22a formed between the refrigerant gas and the suction pipe, and the substantially semi-elliptical cylindrical suction pipe cover is formed. It does not fall into the oil 14 outside the-. Therefore, the liquid refrigerant that has dewed on the surface of the suction pipe does not drop into the oil stored in the closed container,
Since oil having a low refrigerant component can be supplied to each sliding portion and lubricated, reliability can be improved.

[0015]

As described above, the hermetic rotary compressor of the present invention is provided with a substantially semi-elliptic cylindrical suction pipe cover forming a semi-hermetic space for the suction pipe in the hermetic container so that it can be operated during intermittent operation. The liquid refrigerant that is dropped by continuous dew drops in the suction pipe of the refrigerant gas generated in the initial stage of restart of the refrigerant gas does not drop into the oil stored in the closed container, and oil having a low refrigerant component is applied to each sliding portion. Since lubrication can be supplied, reliability can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a hermetic rotary compressor according to the present invention.

FIG. 2 is a partial detailed view of a sectional view of the hermetic rotary compressor according to the present invention.

FIG. 3 is a cross-sectional view of a conventional hermetic rotary compressor.

FIG. 4 is a sectional view taken along line A-A ′ of FIG. 2;

[Explanation of symbols]

 2 Closed container 3 Electric element 4 Compression element 18 Suction pipe 22 Suction pipe cover 22a Semi-closed space

Continuation of the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) F04C 23/00-29/10 331 F04C 18/356

Claims (1)

(57) [Claims] An electric element and a compression element are housed in a closed container, and a suction pipe is hermetically fixed to the compression element and hermetically fixed to the closed container, A hermetic rotary compressor having a substantially semi-elliptic cylindrical suction pipe cover forming a semi-hermetic space for the suction pipe in the closed vessel.