JPH0886283A - Compressor - Google Patents

Abstract

PURPOSE: To improve oil separation operation when HFC is used as a refrigerant and ester oil as lubrication oil. CONSTITUTION: In a compressor C, lubrication oil consisting of ester oil is stored at an inner bottom of a case 1 in which a motor-driven element 3 and a compression element 4 are contained and an HFC refrigerant is discharged from the compression element 4. An oil separation material 21 is arranged between the rotor 12 of the motor-driven element 3 and the compression element 4 and the refrigerant is discharged in a direction in which the rotor 12 is rotated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a hydrofluorocarbon (hereinafter referred to as HFC) as a refrigerant for compression and discharge.
The invention relates to a compressor in which an ester oil having symmetry and an oil compatible with the HFC refrigerant is used as a lubricating oil.

[0002]

2. Description of the Related Art Conventionally, a compressor constituting a mechanical refrigerator is disclosed in, for example, Japanese Utility Model Publication No. 55-53744 (F04B).
39/16) as a hermetic compressor, a compression element (compression mechanism) and an electric element (electric motor) are installed in a case (hermetic housing), and a predetermined amount of lubricating oil and refrigerant is enclosed. ing. The lubricating oil has the function of preventing wear of the sliding portion of the electric element and the function of sealing,
After being mixed with the refrigerant discharged from the compression element or dissolved in the refrigerant and discharged into a supercooler called a precooler in the above publication, it is discharged again into the case.

The refrigerant discharged into the case rides on the swirling flow created by the rotation of the rotor of the electric element and is discharged from the discharge pipe to the refrigerant circuit outside the case.
In order to prevent wear of the compression element and maintain the sealing property, a certain amount of lubricating oil must be stored in the case.

[0004]

However, the conventional compressor is not provided with a mechanism for separating the refrigerant and the lubricating oil discharged from the compression element, and even if the mechanism is provided, the discharge separated from the compression element is provided. Since it was attached near the pipe, it was wound up in the swirl flow again while returning to the bottom of the case, and the amount taken out into the refrigerant circuit increased, which made it difficult to return to the compression element.

Particularly, in recent years, due to the problem of global environment conservation,
HFC refrigerant (R-13
4a) has come to be used for refrigerators.
When such an HFC refrigerant is used, since conventional mineral oils do not dissolve in each other, ester oil compatible with the HFC refrigerant is adopted as the lubricating oil of the compressor. However, since the compatibility is good, the ester oil dissolves in the refrigerant. Since the amount taken out to the refrigerant circuit also becomes large, oil separation in the compressor becomes an important issue.

The present invention has been made to solve the above-mentioned conventional technical problems, and in particular, HFC as a refrigerant.
It is also an object of the present invention to provide a compressor having an improved oil separation action when an ester oil is used as a lubricating oil.

[0007]

A compressor of the present invention stores a lubricating oil composed of ester oil in the bottom of a case accommodating an electric element and a compression element, and discharges a hydrofluorocarbon refrigerant from the compression element. The oil separating means is arranged between the rotor and the compression element of the electric element, and the refrigerant is discharged in the direction in which the rotor is rotating.

According to a second aspect of the invention, a compressor stores a lubricating oil made of ester oil in a bottom portion of a case accommodating an electric element and a compression element, and discharges a hydrofluorocarbon refrigerant from the compression element. , The oil separating means is arranged between the rotor of the electric element and the compression element, and the superheater pipe extending from the compression element to the outside of the case is attached, and the discharge port of the superheater pipe is arranged in the direction in which the rotor is rotating. It was done.

[0009]

According to the compressor of the present invention, the oil separation means is arranged between the rotor of the electric element and the compression element, and the refrigerant is discharged in the direction in which the rotor is rotating. Lubricating oil mixed in the refrigerant discharged from the element is separated from the refrigerant by the oil separating means before reaching the rotor, travels along the inner surface of the case where the refrigerant flow is small, and returns to the vicinity of the compression element located in the vicinity of the rotor. It will be stored. Therefore, it becomes possible to effectively reduce the amount of lubricating oil taken out to the refrigerant circuit and solve the lack of lubricating oil in the compressor, and to provide a compressor suitable when using an HFC refrigerant and ester oil. You can

Further, since the refrigerant is discharged in the rotating direction of the rotor of the electric element, the refrigerant from which the lubricating oil is separated can be smoothly discharged to the outside of the case by riding on the swirling flow. You will be able to improve your ability. In particular, by directing the discharge port of the superconductor pipe in the direction in which the rotor is rotating as in the second aspect of the invention, the discharge direction of the refrigerant can be set easily and accurately.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a vertical sectional side view of a compressor C of the present invention, and FIG. 2 is a plan sectional view of the compressor C. The compressor 1 of the embodiment is a so-called hermetic compressor, and in each of the drawings, reference numeral 1 is a hermetic case in which a lubricating oil made of ester oil is contained in a bottom storage part 2. Inside the case 1, an electric element 3 including a stator 11 and a rotor 12 having a rotating shaft 13 is arranged in an upper part, and a so-called rotary compression element 4 is arranged in a lower part.

The compression element 4 has a cylinder (not shown),
A roller (not shown) which is driven to rotate in a cylinder by a rotary shaft 13 of a rotor 12 of the electric element 3 is also provided, and bearings 6 and 7 are provided above and below the roller. A discharge pipe 8 is attached to the upper end of the case 1, and a suction pipe 5 communicating with the cylinder of the compression element 4 is attached to the side surface of the case 1.

Further, on the other side surface of the case 1, there is attached an inlet 15A of a superconductor pipe 15 which also communicates with the cylinder of the compression element 4. This super pipe 15
After being extended to the outside of the case 1, it is drawn into the case 1 again above the compression element 4, and its discharge port 15B is
It has an opening inside.

On the other hand, in the space between the compression element 4 and the electric element 3, an oil separating material 21 as an oil separating means is arranged along the inner peripheral surface of the case 1. The oil separating material 21 is, for example, a metal net, and when the refrigerant collides with or passes through the oil separating material 21, the oil mixed in the refrigerant is separated.

Here, the rotor 12 of the electric element 3 rotates in the direction of the solid line arrow in FIG. 2, but the discharge port 15B of the superheater pipe 15 rotates between the end faces of the oil separating material 21 to rotate the rotor 12. It opens in the direction as shown in FIG. Further, the coil lower end inner surface 11 of the stator 11 of the electric element 3 located above the oil separating material 21.
As shown in FIG. 2, A is formed in an inclined surface shape that inclines outward as it goes downward.

Next, the operation of the compressor C of the present invention having the above construction will be described. In addition, in the refrigerant circuit which the compressor C comprises, the HFC refrigerant R-134a (52 wt
%), R-125 (25 wt%) and R-32 (23w)
A predetermined amount of non-azeotropic mixed refrigerant composed of t%) is enclosed, and correspondingly, a predetermined amount of ester oil compatible with these HFC refrigerants is enclosed as a lubricating oil in the compressor C, and the storage section It is assumed to be stored in 2.

When the electric element 3 is energized to rotate the rotor 12 in the direction of the solid arrow in FIG.
Is transmitted to rotate the roller of the compression element 4, and discharges the high temperature refrigerant into the superheater pipe 15 from the inlet 15A. Lubricating oil is also mixed with this refrigerant and discharged, but after the refrigerant is air-cooled through the inside of the superconductor pipe 15, the discharge port 1
5B is discharged into the case 1. Since this refrigerant is air-cooled by the superheat pipe 15, the compressor C is cooled by the inflow of this air-cooled refrigerant.

At this time, since the discharge port 15B is oriented in the rotation direction of the rotor 12, the refrigerant is discharged so as to swirl in the rotation direction of the rotor 12 as indicated by the broken line arrow in FIG. Therefore, the refrigerant rises along with the swirling flow created by the rotor 12, smoothly passes between the rotor 12 and the stator 11, and is discharged from the discharge pipe 8 to the refrigerant circuit outside the case 1 (a condenser (not shown) or the like). It

Since the refrigerant discharged from the discharge port 15B collides with the oil separating material 21 before reaching the electric element 3,
The lubricating oil mixed in the refrigerant is separated from the refrigerant by the oil separating material 21 before reaching the rotor 12. Further, the refrigerant that has passed through the oil separating material 21 reaches the lower end of the coil of the stator 11 above it, but the inner surface 11A thereof is formed in the shape of an inclined surface that inclines outward as it goes downward. The lubricating oil that is not completely separated by the separating material 21 adheres to the inner surface 11A and drops.

The lubricating oil thus separated from the refrigerant is
After passing through the inner surface of the case 1 in which the refrigerant flow is small, it returns to the periphery of the compression element 4 located immediately below and is stored in the storage part 2. Therefore, the amount of lubricating oil taken out to the refrigerant circuit is effectively reduced, and the lack of lubricating oil in the compressor C can be resolved.

Although the oil separating material 21 is provided as the oil separating means in the embodiment, the function of the oil separating means can be expected not only by the oil separating material 21 but also only by the inner surface 11A of the lower end portion of the coil of the stator 11 of the electric element 3. Further, in the embodiment, the super pipe 1
5, the refrigerant is discharged in the rotation direction of the rotor 12, but the invention is not limited to this, and may be discharged directly from the muffler attached to the compression element 4 and the direction may be set as the rotation direction of the rotor 12.

Further, in the embodiment, R-1 is used as the HFC refrigerant.
34a, R-125 and R-32 are used as the non-azeotropic mixed refrigerant, but other HFC refrigerants are also effective, and the compression element is not limited to the so-called rotary type composed of cylinders and rollers, but also the reciprocating type. It goes without saying that it is also effective for a scroll type or a scroll type.

[0023]

As described in detail above, according to the present invention, the oil separating means is arranged between the rotor and the compression element of the electric element, and the refrigerant is discharged in the direction in which the rotor is rotating. Therefore, the lubricating oil mixed in the refrigerant discharged from the compression element is separated from the refrigerant by the oil separation means before reaching the rotor, and is transmitted through the case inner surface or the like where the refrigerant flow is small,
It returns to the periphery of the compression element located in the vicinity and is stored. Therefore, it becomes possible to effectively reduce the amount of lubricating oil taken out to the refrigerant circuit and solve the lack of lubricating oil in the compressor, and to provide a compressor suitable when using an HFC refrigerant and ester oil. You can

Further, since the refrigerant is discharged in the rotating direction of the rotor of the electric element, the refrigerant from which the lubricating oil has been separated can be smoothly discharged to the outside of the case along with the swirling flow. You will be able to improve your ability. In particular, if the discharge port of the superheater pipe is directed toward the direction in which the rotor is rotating as in the second aspect of the invention, the discharge direction of the refrigerant can be set easily and accurately.

[Brief description of drawings]

FIG. 1 is a vertical sectional side view of a compressor of the present invention.

FIG. 2 is a plan sectional view of the compressor of the present invention.

[Explanation of Codes] C Compressor 1 Case 2 Reservoir 3 Electric element 4 Compression element 11 Stator 12 Rotor 15 Desuper pipe 15B Discharge port 21 Oil separating material

Claims (2)

[Claims] 1. A compressor for storing a lubricating oil composed of ester oil in a bottom portion of a case accommodating an electric element and a compression element and discharging a hydrofluorocarbon refrigerant from the compression element, the rotor of the electric element and the rotor. A compressor characterized by arranging an oil separating means between compression elements and discharging the refrigerant in a direction in which the rotor is rotating. 2. A compressor in which a lubricating oil composed of ester oil is stored in a bottom portion of a case accommodating an electric element and a compression element, and a hydrofluorocarbon refrigerant is discharged from the compression element, the rotor of the electric element and the rotor. An oil separating means is arranged between the compression elements, a super pipe extending from the compression element to the outside of the case is attached, and a discharge port of the super pipe is arranged in a direction in which the rotor is rotating. And a compressor.