JPH05157081A - Closed type rotary compressor - Google Patents

Abstract

PURPOSE:To stabilize lubricating condition of each sliding part at the time of re-starting, and to improve the reliability. CONSTITUTION:A closed rotary compressor comprises an inlet pipe cover 22a fixed to a closed container 2, an inlet pipe cover 22b press-fitted and is fixed along an inlet pipe 18, to a side plate 9, and a closed space 22d.

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 device such as a refrigerator, especially when the crankshaft is mounted so as to be positioned in a substantially horizontal direction.
The present invention relates to a technology for smooth lubrication.

[0002]

2. Description of the Related Art In recent years, hermetic rotary compressors in the refrigeration and air-conditioning industry have been remarkably popularized in the market, and particularly in a refrigerator or the like, a horizontal type in which a machine room space for accommodating a compressor can be reduced has become mainstream.

Reference will now be made to Japanese Patent Application Laid-Open No. 61-47 with reference to the drawings.
An example of a conventionally known hermetic rotary compressor as disclosed in Japanese Patent Publication No. 994 will be described. FIG. 3 shows a sectional view of a conventional hermetic rotary compressor. In FIG. 3, reference numeral 1 is a main body of a hermetic rotary compressor, and an electric element 3 and a compression element 4 are integrally housed in a hermetic container 2. Three
Reference numeral a denotes a stator of the electric element 3, which is press-fitted and fixed to the closed casing 2. 3b is a rotor.

Reference numeral 5 is a side plate integrally having a main bearing 5a for supporting the crankshaft 6 press-fitted into the rotor 36. The crankshaft 6 is horizontally arranged in the closed container 2.

The side plate 5 is lightly press-fitted into the closed container 2 and then fixed by welding or the like. Reference numeral 7 is a cylinder plate for housing the rotary piston 8 provided on the eccentric portion 6a of the crankshaft 6. Reference numeral 9 denotes a side plate integrally having a bearing 9a that supports the crankshaft 6.

The side plate 5, the cylinder plate 7 and the side plate 9 are integrated by a bolt 10 to define a compression chamber 11. Reference numeral 12 denotes a vane that divides the compressor chamber 11 into a high pressure side and a low pressure side.
Is a vane spring. Reference numeral 13 is a spring guide that is tightened together with the bearing 9a by the bolt 10, and includes a mounting period portion 13a that fits into the bearing 9a and an oil pipe 13b that is bent downward.

The upper end of the oil pipe 13b is attached to the mounting portion 1
The oil 1 which is connected to an opening 13c provided coaxially with the crankshaft 6 of 3a and has a lower end stored below the closed container 2
It is immersed in 4. Reference numeral 15 denotes a close-wound coil spring screwed and fixed to a screw portion 6b formed at the end portion of the crankshaft 6, which extends into the oil pipe 13b through the opening 13c and has a slightly conical throttle portion 15a at the tip. Has been formed. The coil spring 15 has an outer diameter substantially equal to the inner diameter of the oil pipe 13b.

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

In the above structure, when the electric element 3 is energized and the rotor 3b rotates, the crankshaft 6 rotates, and the rotation piston 8 rotates to compress the refrigerant gas sucked from the suction pipe 18 into the compression chamber 11. Then, it is discharged into the closed container 2 through a discharge valve (not shown), and then sent to the refrigeration cycle through the discharge pipe 17.

On the other hand, the rotation of the crankshaft 6 simultaneously rotates the closely wound coil spring 15 in the spring guide 13. Due to this rotation, the close-wound oil spring 15 and the close-wound coil spring 1 along the inner walls of the oil pipe 13b.
The oil 14 rises by the reed 5 and reaches the hydraulic chamber 16. After that, the oil in the hydraulic chamber 16 is replaced with oil grooves 6c, 6d,
6e, bearing 9a, rotary piston 8, main bearing 5a
Lubricate each.

[0011]

However, in the above-mentioned conventional configuration, the suction pipe is rapidly cooled by the refrigerant gas sucked from the cooler at the initial stage of restart of the hermetic rotary compressor in the intermittent operation state. Therefore, the high-temperature and high-pressure refrigerant gas discharged into the closed container is exposed on the outer surface of the suction pipe inside the closed container and drops into the oil stored in the lower part of the closed container to make a wandering motion, and the oil pipe is rich in refrigerant. Since it is sucked in the oil state, the lubrication state of the oil pipe and the closely wound spring, the crankshaft and the bearing, the rotary pinton, and the main bearing has a problem that the refrigerant in the oil and the foaming phenomenon temporarily deteriorate. ..

The present invention solves the conventional problems, and an object thereof is to stabilize the lubrication state of each sliding portion at the time of restart and improve the reliability.

[0013]

In order to achieve this object, a hermetic rotary compressor of the present invention comprises a substantially cylindrical suction pipe cover which forms a closed space to cover a suction pipe in a hermetic container. It is provided with a configuration of arranging.

[0014]

In the hermetic rotary compressor of the present invention, the suction pipe cover is provided to thermally insulate the suction pipe and the refrigerant gas in the closed container, so that the suction pipe is continuously connected to the suction pipe at the initial stage of restart during intermittent operation. This prevents dewdrops and suppresses dewdrops on the suction pipe cover.

[0015]

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 of the conventional example will be described using the same reference numerals, and the same parts of the configuration and operation will be omitted.

FIG. 1 is a sectional view of a hermetic rotary compressor, and FIG. 2 is a partial detailed view of FIG. In the figure, 22a is a suction pipe cover A fixed to the closed container 2 by welding or an adhesive, and 22b is a suction pipe cover 1 on the side plate 9.
8 is a suction pipe cover B press-fitted and fixed together with 8.

The suction pipe cover A22a and the suction pipe cover B22b constitute a suction pipe cover 22 which covers the suction pipe 18 by a fitting portion 22c.
22d is the suction pipe 18 and the suction pipe cover 2
In the closed space formed between the inside of the closed container 2 and the inside of the closed container 2, the closed container 2 and the fitting part 22c communicate with each other.

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

At the initial stage of restarting the hermetic rotary compressor,
While the liquid refrigerant overflowing from the cooler evaporates, part of it reaches the suction pipe and is sucked into the compression chamber. At this time, the suction pipe is cooled below the condensation temperature of the high-pressure refrigerant gas in the closed container, so that the refrigerant gas in the closed space between the suction pipe and the suction pipe cover is exposed to the surface of the suction pipe and depressurized.

However, since the closed space is communicated with the closed container with only a small gap, a large amount of the refrigerant gas in the closed container is not supplied to the closed space. It is possible to prevent dewdrops and also to prevent the liquid refrigerant from properly falling into the oil stored in the closed container. At the same time, the decrease in the surface temperature of the suction pipe cover is suppressed by the thermal insulation of the closed space even if there is a temporary decrease in the temperature of the suction pipe. Therefore, it is possible to suppress the dew drop of the high pressure refrigerant gas in the closed container on the surface of the suction pipe cover.

Further, the heat insulating effect can be further enhanced by using a plastic material for the suction pipe cover.

Therefore, since the liquid refrigerant that has dewed on the surfaces of the suction pipe and the suction pipe cover does not fall into the oil stored in the closed container, oil having a low refrigerant component is supplied to each sliding portion. Since it can be lubricated, reliability can be improved.

[0023]

As described above, the hermetic rotary compressor of the present invention is hermetically sealed with the suction pipe by providing the substantially cylindrical suction pipe cover which covers the suction pipe in the hermetic container to form a closed space. By thermally insulating the refrigerant gas in the container, it prevents continuous dewdrops on the suction pipe and also suppresses dewdrops on the suction pipe cover during the initial period of restart during disconnection operation, so it is stored in a closed container. Moreover, since there is no liquid refrigerant dripping into the oil, lubrication can be supplied to each sliding portion of the oil having a low refrigerant component, so that reliability can be improved.

[Brief description of 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 a hermetic rotary compressor according to the present invention.

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

[Explanation of symbols]

 2 Airtight container 18 Suction pipe 22 Suction pipe cover 22a Suction pipe cover A 22b Suction pipe cover B 22d Closed space

Claims (2)

[Claims] 1. A suction container which houses an electric element and a compression element in a hermetic container and which is airtightly fixed to the compression element and also hermetically fixed to the hermetic container. A hermetically sealed rotary compressor, characterized in that a substantially cylindrical suction pipe cover is arranged to cover the suction pipe in the hermetic container to form a closed space. 2. The hermetic rotary compressor according to claim 1, wherein a plastic material is used for the suction pipe cover.