JP2002070742A - Refrigerant compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a refrigerant compressor which is suitable for lubricating a reciprocated sliding part between a cylinder and a piston of a compressor in particular using a new refrigerant without chloride with regard to the refrigerant compressor used for a freezer or the like and in which refrigerating performance is increased. SOLUTION: As a means for introducing into spacing between the inside perimeter face of a cylinder and the outside perimeter face of a piston at a rotating shaft side of the compressor part, the inside diameter of the cylinder is greatly formed within a determined dimension from the end of the cylinder at rotating shaft side, makes it possible to ensure a volume for oil storage, increase sealing performance by lubricating into the sliding part between the cylinder and the piston and also prevents abrasion of the sliding part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerant compressor for use in refrigerators and the like, and more particularly to lubrication of a reciprocating sliding portion between a cylinder and a piston of a compressor using a new refrigerant containing no chlorine. The present invention relates to a refrigerant compressor for improving capacity.

[0002]

2. Description of the Related Art In recent years, refrigerants containing chlorine have been subject to use restrictions due to the problem of environmental pollution. Therefore, for example, HFC134a is used as a new refrigerant complying with regulations. However, HFC134a has room for improvement because it has a decrease in lubrication characteristics and performance characteristics as compared with the conventional R-12. Therefore, as a method of compensating for the deterioration of the characteristics using the refrigerating machine oil, a refrigerating machine oil is mixed into a suction gas of a compressor described in Japanese Patent Application Laid-Open No. 8-270561, and a sliding between a cylinder inner diameter and a piston outer diameter is performed. While lubricating the moving parts,
A device that seals a gap between the sliding portions has been known.

[0003]

However, in the method of mixing the refrigerating machine oil into the suction gas of the compressor, the refrigerating machine oil contained together with the gas to be compressed and discharged is sent to a refrigerating cycle constituting a refrigerator or the like, and the inside of the compressor is removed. There is a problem that the lubrication of the sliding portion may be hindered due to the shortage of the refrigerating machine oil stored in the refrigeration cycle, and the heat transfer performance of a heat exchanger provided for the refrigeration cycle may be reduced.

[0004] The present invention provides a refrigerant compressor in which these problems are improved.

[0005]

According to a first aspect of the present invention, there is provided an electric motor unit in an airtight container storing refrigerating machine oil, the electric motor unit being connected to an upper portion of the electric motor unit via a rotary shaft. And a compressor unit having a rotation axis perpendicular to the rotation axis, and a lower end of the rotation shaft serving as a suction port of an oil supply mechanism provided on the rotation shaft is immersed in refrigerating machine oil. In the above, a part of the refrigerating machine oil sprinkled from the upper end of the rotating shaft to the compressor unit by raising the oil supply mechanism with the rotation of the rotating shaft is used to remove the inner circumferential surface of the rotating shaft side cylinder of the compressor unit and the outer periphery of the piston. As a means for guiding to the gap between the cylinder and the piston, a large cylinder inner diameter within a predetermined dimension from the end face of the cylinder on the rotating shaft side is secured to secure a volume for oil storage and supply oil to the sliding part between the cylinder and piston. is there.

According to a second aspect of the present invention, as a means for guiding a part of the refrigerating machine oil sprinkled on the compressor portion into a gap between the inner peripheral surface of the cylinder and the outer peripheral surface of the piston, the portion of the inner peripheral surface of the cylinder on the rotating shaft side is provided. By forming a chamfer at the open end,
This is for collecting the sprinkled refrigerator oil.

According to a third aspect of the present invention, a fence is provided on an upper portion of the cylinder of the compressor section as means for guiding a part of the refrigerating machine oil sprinkled on the compressor section into a gap between the inner peripheral surface of the cylinder and the outer peripheral surface of the piston. In addition to being erected, a hole for introducing refrigerating machine oil into the cylinder is formed above the cylinder on the rotating shaft side of the fence, so that the sprinkled refrigerating machine oil is collected and supplied into the cylinder. .

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS First, a refrigerant compressor according to the present invention will be described with reference to the drawings. FIG. 1 is a plan view showing the internal structure of a refrigerant compressor according to an embodiment of the present invention, and FIG. 2 is a longitudinal sectional view of the same. In the figure, reference numeral 1 denotes a closed container, in which an electric motor 2 arranged below the inside thereof and a compressor section 7 driven by the electric motor 2 via a rotating shaft 3 are provided above. The compressor unit 7 controls the rotation of the eccentric pin 3 a provided on the rotating shaft 3 by the slider 4 and the piston 5.
Is converted into a reciprocating motion of the piston 5 through the cross slide portion 5a of the cylinder 6, and the piston 5 reciprocates in the cylinder 6.

The cylinder 6 has a suction muffler 10 on its side.
A discharge muffler 9 is provided at a front portion, which is opposite to the rotation axis direction, via a valve seat plate 8, and a refrigerant gas suction and discharge path is formed.

In addition, a refrigerating machine oil 15 for lubricating a sliding part of the compressor part 7 and a bearing sliding part 14 of the rotating shaft 3 for driving the compressor part 7 is stored at the bottom of the sealed container 1. Axis 3
Refrigeration oil 1 by centrifugal pump 16 provided at the lower end of
5 and first supply oil to a sliding portion with the bearing 14, and further provide an oil supply hole 18 provided in the inner diameter of the rotating shaft 3 and the eccentric pin 3 a.
The oil is supplied to the compressor unit 7 located at the upper side through the cylinder.

The refrigerating machine oil 15 supplied to the compressor unit 7 is guided to the outer diameter of the eccentric pin 3a, and after lubricating the sliding parts of the inner and outer diameters of the slider 4, the reciprocating motion of the piston 5 and the slider 4 is performed. Scatters from the end of the sliding portion to the periphery. Further, the extra refrigerating machine oil 15 remaining after the oil is supplied to the slider 4 scatters from an oil supply hole 18 opened at the upper end of the eccentric pin 3a.
Part of the scattered refrigerating machine oil 15 adheres to the outer peripheral surface of the reciprocating piston 5 as oil droplets, thereby lubricating the sliding portion between the outer peripheral surface of the piston 5 and the inner peripheral surface of the cylinder 6 and The gap between the sliding portions is sealed.

FIG. 3 shows the details of the compressor section 7 according to an embodiment of the present invention. The inner diameter of the cylinder 6 within a predetermined dimension A (10 mm in this embodiment) from the cylinder end face on the rotating shaft 3 side is shown. The oil reservoir 11 is formed by making it larger. As a result, the refrigerating machine oil scattered from the upper end of the oil supply hole and formed as oil droplets and mainly adhered upward on the outer peripheral surface of the piston is removed from the piston 5.
Enters the gap between the piston 5 and the cylinder 6 in the compression stroke of being inserted into the cylinder 6, but the excess refrigerating machine oil is stored in the oil sump and spills into the lower oil sump to be retained. Next, the refrigerating machine oil retained in the suction stroke in which the piston 5 is discharged from the cylinder 6 adheres to the entire outer peripheral surface of the piston evenly. Oil can be supplied over the entire circumference of the gap, and the sealing performance and lubrication properties can be improved.

Further, the oil sump can be easily formed at the time of roughing the inner peripheral surface of the cylinder, and does not require an extra man-hour, so that a refrigerant compressor having improved performance and reliability can be manufactured at a low cost. Can be provided by

FIG. 4 shows another embodiment of the present invention.
FIG. 5 is a cross-sectional view taken along the line BB in FIG. 4, and the cylinder end face on the side of the rotating shaft 3 has a chamfer having a large D dimension at the top and a small C dimension at the bottom. 1
2 are formed. As a result, most of the refrigerating machine oil scattered and sprinkled from the oil supply hole 18 can be collected on a wide receiving surface because most of the refrigerating machine oil is located above the cylinder corresponding to the upper end position of the oil supply hole 18. It is possible to increase the amount of oil supplied to the sliding portion between the five.

FIG. 6 shows a compressor unit 7 according to another embodiment of the present invention.
FIG. 7 shows a state as viewed from the direction of the arrows EE in FIG. 6. A fence 13 is erected on the upper part of the cylinder 6 and the cylinder 6 on the rotation shaft 3 side of the fence 13. In the upper part, a hole 17 communicating with the inside of the cylinder 6 is formed. Thus, most of the refrigerating machine oil scattered and sprinkled from the refueling hole 18 is located above the cylinder 6 corresponding to the upper end position of the refueling hole 18, so that the sprinkled refrigerating machine oil is effectively collected by the fence 13. At the same time, the collected refrigerating machine oil can be supplied into the cylinder 6,
Oil can be reliably supplied to the sliding portion between the cylinder 6 and the piston 5.

As described above, in the present invention, the oil is supplied to the sliding portion between the cylinder 6 and the piston 5 from the rotating shaft side, so that the amount of the refrigerating machine oil contained in the discharge gas can be increased without increasing the amount of the refrigerating machine oil. The sealability between the piston 6 and the piston 5 can be improved, and the wear of the sliding portion can be prevented, so that a highly reliable refrigerant compressor can be supplied even when a new refrigerant is used. .

[0017]

As described above, according to the first aspect of the present invention, the motor unit is provided in the closed container storing the refrigerating machine oil.
A compressor section connected to the upper portion of the electric motor section via a rotating shaft, a rotating shaft center disposed in a vertical direction, and a lower end of the rotating shaft serving as a suction port of an oil supply mechanism provided on the rotating shaft. In the refrigerant compressor, which is immersed in refrigeration oil, a part of the refrigeration oil sprinkled from the upper end of the rotation shaft to the compressor unit by raising the oil supply mechanism with the rotation of the rotation shaft, As a means to guide to the gap between the inner peripheral surface of the rotating shaft side cylinder and the outer peripheral surface of the piston of the part, by forming the cylinder inner diameter within a predetermined dimension from the rotating shaft side cylinder end surface to be large,
It is possible to secure a volume for oil storage, to improve the sealing performance by supplying oil to a sliding portion between the cylinder and the piston, and to prevent wear of the sliding portion.

According to the second aspect of the present invention, as means for guiding a part of the refrigerating machine oil sprinkled on the compressor portion to the gap between the inner peripheral surface of the cylinder and the outer peripheral surface of the piston, the rotating shaft side of the inner peripheral surface of the cylinder is provided. By forming a chamfer at the open end of
The sprinkled refrigerating machine oil can be collected, and the amount of oil supplied to the sliding portion between the cylinder and the piston can be increased.

According to the third aspect of the present invention, as a means for guiding a part of the refrigerating machine oil sprinkled on the compressor portion to the gap between the inner peripheral surface of the cylinder and the outer peripheral surface of the piston, a fence is provided above the cylinder of the compressor portion. And a hole for introducing refrigerating machine oil into the cylinder is formed in the upper part of the cylinder on the rotating shaft side from this fence, so that the sprinkled refrigerating machine oil is collected and supplied into the cylinder. Thus, it is possible to reliably supply oil to the sliding portion between the cylinder and the piston.

[Brief description of the drawings]

FIG. 1 is a plan view showing the internal structure of a refrigerant compressor according to an embodiment of the present invention.

FIG. 2 is a vertical sectional view showing the internal structure of the refrigerant compressor.

FIG. 3 is a diagram showing details of a compressor unit in the embodiment.

FIG. 4 is a diagram showing details of a compressor section according to another embodiment of the present invention.

FIG. 5 is a sectional view taken along line BB of FIG. 4;

FIG. 6 is a diagram showing details of a compressor section in another embodiment of the present invention.

FIG. 7 is a view taken along the line EE in FIG. 6;

[Explanation of symbols]

 3 Rotating shaft 5 Piston 6 Cylinder 7 Compressor section 11 Oil sump 12 Chamfer 13 Fence 15 Refrigerator oil 17 Hole

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tsuyoshi Oyama 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Akihiro Suda 2-5-2 Keihanhondori, Moriguchi-shi, Osaka No. 5 Sanyo Electric Co., Ltd. F term (reference) 3H003 AA02 AB03 AC03 BD06 BD10 CD03 CE02 CE04

Claims (3)

[Claims] 1. A motor unit and a compressor unit connected to an upper part of the motor unit via a rotary shaft in a closed container storing the refrigerating machine oil, with a rotation axis centered in a vertical direction. In a refrigerant compressor in which a lower end of a rotary shaft serving as a suction port of a refueling mechanism provided on the rotary shaft is immersed in refrigerating machine oil, the refueling mechanism is moved upward with rotation of the rotary shaft to raise an upper end of the rotary shaft. A part of the refrigerating machine oil sprinkled on the compressor section from
A refrigerant compressor characterized in that a cylinder inner diameter within a predetermined dimension from a rotary shaft side cylinder end surface is formed to be large as means for guiding to a gap between a rotary shaft side cylinder inner circumferential surface and a piston outer circumferential surface of the compressor section. 2. A chamfer is formed at an opening end of the inner peripheral surface of the cylinder on the rotating shaft side as a means for guiding a part of the refrigerating machine oil sprinkled on the compressor portion to a gap between the inner peripheral surface of the cylinder and the outer peripheral surface of the piston. The refrigerant compressor according to claim 1, wherein: 3. A means for guiding a part of the refrigerating machine oil sprinkled on the compressor portion into a gap between the inner peripheral surface of the cylinder and the outer peripheral surface of the piston. The refrigerant compressor according to claim 1 or 2, wherein a hole for introducing refrigerating machine oil into the cylinder is formed in an upper portion of the cylinder on the rotation shaft side of the fence.