JPH06323286A - Rotary compressor - Google Patents

Abstract

PURPOSE:To supply cooled oil for improving an effect of cooling a cylinder and an effect of lubricating a slide part by supplying oil in an enclosed receptacle through a communicating pipe to an outlet hole opened to a bearing plate defining a compression chamber together with the cylinder. CONSTITUTION:When a shaft is driven by a motor element, a piston 29 is rolled in a compression chamber of a cylinder 28. As a result, refrigerant gas sucked from a suction pipe 40 is compressed and discharged into an enclosed receptacle 21 to be thereafter sent out of a discharge pipe 39 to the outside. Then, pressure in the high pressure chamber side of the compression chamber is lowered lower than that in th enclosed receptacle 21. Thus, oil 22 sucked through a communicating pipe 34 is jetted from an outlet hole 32 opened to a bearing plate 31a to the high pressure chamber side intermittently by utilizing a difference in pressure. A refrigerant dissolved in the oil is vaporized by the difference in pressure. Hence, the inside of th cylinder 28 is efficiently cooled by utilizing the oil, while slide parts between the piston 29 and a vane 30 is efficiently lubricated.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rolling piston type rotary compressor used in refrigerators and the like.

[0002]

2. Description of the Related Art In recent years, rolling piston type rotary compressors (hereinafter referred to as compressors) have undergone many improvements for high energy efficiency and high reliability.

A conventional compressor will be described below with reference to the drawings. 4 to 5 are disclosed in JP-A-1-170784.
FIG. 4 is a sectional view of the compressor shown in FIG. 4, and FIG. 5 is an enlarged sectional view of an essential part of FIG.

In the figure, an electric element 2 is arranged in the upper part of a closed container 1, and a compression element 3 is arranged in the lower part. The electric element 2 comprises a stator 4 and a rotor 5. The compression element 3 is a shaft 6
And a cylinder 8 sandwiched by a pair of bearing plates 7 holding the shaft 6 and a pair of bearing plates 7, and an eccentric part (not shown) of the shaft 6 rotatably fitted to the end face. It is composed of a piston 9 having a taper or a step 11 and a vane 10 pressed by the piston 9 in the cylinder 8 chamber.

Regarding the compressor configured as described above,
The operation will be described below. Refrigerant gas sucked from a suction pipe (not shown) enters the compression element 3 and is gradually compressed by the rotation of the piston 9 to become a high pressure, and then passes through a valve (not shown) to form a high pressure sealed type container. It is discharged into the container 1, and further discharged from a discharge pipe (not shown) to a cycle (not shown).

Further, the oil conveyed by the oil supply pump (not shown) provided on the shaft 6 lubricates the shaft 6 system, but a part of the oil is a high pressure gas in the closed container 1 and a low pressure in the cylinder 8. After entering the cylinder 8 due to the pressure difference with the gas and lubricating the sliding parts of the piston 9 and the vane 10, they are discharged together with the refrigerant gas into the high-pressure closed container 1 from a valve (not shown). At this time, since the seal width of the piston end surface is narrowed by the taper or the step, the oil necessary for lubricating the cylinder 8 is sufficiently secured.

[0007]

However, in the above-mentioned conventional structure, due to the structural problem of ensuring the oil supply into the cylinder by narrowing the seal width of the piston end face, the low pressure from the high pressure chamber in the cylinder is reduced in the compression process. Refrigerant gas easily leaks into the chamber, reducing energy efficiency. In addition, in order to increase energy efficiency, it is necessary to widen the seal width of the piston end face, but if this is done, sufficient oil supply to the cylinder cannot be obtained, and due to variations in the clearance between the piston and bearing plate There is a problem that stable reliability characteristics cannot be obtained because the variation of the oil supply amount is extremely large and the cooling effect is not constant.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to obtain a highly reliable compressor having a stable cooling effect in the cylinder by providing stable oil supply to the cylinder. There is.

[0009]

In order to achieve this object, the compressor of the present invention is closed by a section where at least one inner surface of the bearing plate communicates with the cylinder inner space due to rotation of the piston and an end surface of the piston. The outlet hole opened at a position having a section is communicated with the oil in the closed container.

[0010]

[Operation] With the above-mentioned structure, the present compressor is characterized by intermittently ejecting oil from the outlet hole into the cylinder.
Sufficient oil can be supplied to the sliding parts such as the vanes and pistons, and it also has the effect of cooling the inside of the cylinder.

[0011]

Embodiments of the compressor according to the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a compressor according to an embodiment of the present invention. FIG. 2 is an enlarged sectional view of a main part of the embodiment.
FIG. 3 is a sectional view taken along the line AA of FIG.

In FIGS. 1 and 2, reference numeral 21 denotes a closed container,
Reference numeral 22 denotes oil stored in the closed container 21, and 23 denotes an electric motor, which is composed of a stator 24 and a rotor 25. A shaft 26 has an eccentric portion 27 and is driven by the rotor 25. Two
Reference numeral 8 denotes a cylinder, which forms the compression chamber 28a by the bearing plates 31a and 31b.

29 is a piston fitted into the eccentric portion 27,
It rolls in the compression chamber 28a. 30 is a vane and piston 2
The compression chamber 28a is partitioned into a high pressure chamber side 44 and a low pressure chamber side 45 by contacting with the outer peripheral surface of 9. 32 is an outlet hole opened on the inner surface of the bearing plate 31a, 34 is a communicating pipe, one end of which is connected via a plug 35 and which is communicated with the outlet hole 32 and the other end of which is opened in the oil 22.

A discharge pipe 39 is fixed to the closed container 21. A suction pipe 40 is fixed to the bearing plate 31a and opens to the low pressure chamber side 45.

FIG. 3 is a sectional view taken along the line AA of FIG. In FIG. 3, the compression chamber 28 a is formed by the vane 30 on the high pressure chamber side 4.
4 and the low pressure chamber side 45. The outlet hole 32 is opened to the high-pressure chamber side after the suction process is completed and before the compression process is completed, and is provided at a position where it is closed by the piston 29 during the other period. Reference numeral 50 indicates the rotation direction of the shaft 26.

In the structure as described above, the electric element 23
The shaft 26 is driven by the piston 26, and the piston 29 rolls in the compression chamber 28a, whereby the refrigerant gas sucked from the suction pipe 40 is compressed in the compression chamber 28a, discharged into the closed container 21, and then discharged. It is delivered to the system (not shown) through the pipe 29. At this time, from the end of the suction process to the end of the compression process, the pressure inside the high pressure chamber side 44 of the compression chamber 28a is lower than the pressure inside the closed container 21, and the oil sucked from the communication pipe 34 due to this pressure difference. 22 is the exit hole 3
2 is ejected intermittently into the high pressure chamber side 44. On this occasion,
Since the refrigerant dissolved in the jetted oil evaporates due to the above-mentioned pressure difference, the cooling effect in the cylinder is extremely large. Further, this oil has the effect of ensuring the lubrication of the sliding portion between the piston 29 and the vane 30, and as a result, prevents the wear of this portion and the heat generation due to this wear. Therefore, the refrigerant gas temperature due to compression heat generation and wear heat generation can be kept low, the decomposition of the refrigerant can be prevented, the thermal deterioration of the oil can be reduced, and the progress of wear between the piston and the vane can be eliminated, and extremely high reliability can be obtained. .

[0018]

As described above, the compressor of the present invention has a section where at least one inner surface of the bearing plate communicates with the cylinder inner space due to rotation of the piston, and a section where the end surface of the piston closes. By communicating the outlet hole opened at the position with the oil in the closed container, the oil is intermittently ejected from the outlet hole into the cylinder, so that sufficient oil is applied to the sliding parts such as vanes and pistons. Can be supplied and also has the effect of cooling the inside of the cylinder, so that a compressor having extremely high reliability characteristics can be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of a compressor according to the present invention.

FIG. 2 is an enlarged cross-sectional view of the main part of FIG.

FIG. 3 is a sectional view taken along line AA of FIG.

FIG. 4 is a sectional view of a conventional compressor.

FIG. 5 is an enlarged view of a main part of the compression element in FIG.

[Explanation of symbols]

 21 Airtight Container 22 Oil 23 Electric Element 26 Shaft 27 Eccentric Part 28 Cylinder 29 Piston 30 Vanes 31a, 31b Bearing Plate 32 Outlet Hole 34 Communication Tube

Claims (1)

[Claims] 1. A piston which stores oil in a hermetic container and which is driven by an electric element and rolls along an inner wall surface of a cylinder fitted to an eccentric portion provided on the shaft. A vane that contacts the outer peripheral surface of the piston to partition the cylinder internal space into a high-pressure chamber and a low-pressure chamber, and a pair of bearing plates that closes both end surfaces of the cylinder. A high-pressure rolling-piston rotary compressor that opens inside, a section that communicates with the cylinder inner space on at least one inner surface of the bearing plate due to rotation of the piston,
A rotary compressor in which an outlet hole opened at a position having a section closed by the end face of the piston and the oil in the closed container are communicated with each other.