JPH06323274A - Oiling device of low pressure rotary type refrigerant compressor - Google Patents

Abstract

PURPOSE:To improve the sealing property of gas for improving the performance of a compressor by immersing bearing or the like shaft-supporting a crank in refrigerating machine oil stored on the bottom of an enclosed casing, while forming on oil feed hole opened to the refrigerating machine oil to communicate with a suction path. CONSTITUTION:When a crank 3 is rotatably driven by a motor element 12, pressure in a low pressure chamber 7 and suction path 14 of a cylinder 2 is reduced lower than that is an enclosed casing 1. Then, refrigerating machine oil 13 stored on the bottom of the enclosed casing 1 is fed to a roller 6 after fed from an oil feed hole 16 formed in an auxiliary bearing 19 of the crank 3 for example to the cylinder 2 and then to a roller 6. Also, a portion of the refrigerating machine oil is fed to a vane 9 and vane groove and the remaining part is discharged from a high pressure chamber 8 to a discharge pipe 18. Thus, a gas sealing property is improved and the performance of a compressor is improved. When the refrigerating machine oil discharged to the discharge pipe 18 is increased, the capacity of the compressor is reduced, so that the inner diameter and path of the oil feed hole 16 are adjusted to adjust the discharge amount of the refrigerating machine oil.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an oil supply mechanism for a low-pressure rotary refrigerant compressor.

[0002]

2. Description of the Related Art As a conventional example, for example, JP-A-63-16
Some are described in Japanese Patent No. 1299.

A conventional example will be described with reference to FIG. In FIG. 3, 1 is a closed casing, 2 is this closed casing 1
Cylinder 3 disposed inside is arranged at the axial center position of this cylinder 2, crank having an eccentric shaft portion, 4 is a main bearing arranged at one end of the cylinder 2, and 5 is a main bearing. An auxiliary bearing arranged at the end of the cylinder 2 on the opposite side of 4, a roller eccentrically rotating in the cylinder 2, 7 is a low pressure chamber formed by a cylinder or the like, and 8 is a high pressure chamber. Reference numeral 9 is a vane that separates the low pressure chamber from the high pressure chamber, 10 is a discharge muffler, 11 is a gear pump for refueling, 12 is an electric motor element, and 13 is refrigerating machine oil.

Next, the operation will be described. When the rotary shaft 3 is driven by the electric motor element 12, oil is supplied to the bearing portions of the main bearing 4 and the sub bearing 5 of the crank 3 and the inner peripheral portion of the roller 6. Further, the roller 6 rotates eccentrically in the cylinder 2, and the vane 9 is constantly brought into pressure contact with the roller 6, so that the low pressure chamber 7 and the high pressure chamber 8 are formed, and a closed casing is provided via a discharge pipe (not shown). 1 is discharged to the high pressure pipe.

[0005]

However, in the above-mentioned conventional structure, the bearing portion that pivotally supports the crank 3 is sufficiently lubricated, and the low pressure chamber 7 and the high pressure chamber 8 of the cylinder 2 are lubricated only in the closed casing. In case of high pressure compressor, roller 6
However, in the case of a low pressure compressor in the closed casing of the present case, the pressure inside the roller 6 is always lower than that in the high pressure chamber 8 and is almost the same as that in the low pressure chamber 7. Therefore, there is almost no oil outflow from the gap between the roller 6 and each member. Therefore, there have been problems such as an increase in leakage due to a decrease in sealing performance, a decrease in performance, and an increase in temperature of the contact surface between the roller 6 and the vane 9.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an oil supply device capable of stably supplying oil to a low pressure chamber of a cylinder in a low pressure rotary compressor. And

[0007]

In order to achieve the above object, according to the present invention, the auxiliary bearing or the main bearing or a part of the cylinder is arranged so as to be immersed in the refrigerating machine oil accumulated at the bottom of the closed casing, and the auxiliary In the bearing, the main bearing, or the cylinder, one end is opened to the suction passage, and the other end is provided with an oil supply hole that is opened into the refrigerating machine oil accumulated at the bottom of the closed casing.

[0008]

In the in-cylinder oil supply device of the present invention, the auxiliary bearing, the main bearing, or a part of the cylinder is arranged so as to be immersed in the refrigerating machine oil accumulated at the bottom of the closed casing. Since one end is opened to the suction path and the other end is provided with an oil supply hole that is opened in the refrigerating machine oil accumulated at the bottom of the closed casing, no separate parts are required and assembly is not troublesome and inexpensive. It is possible to stably supply oil to the cylinder.
It is possible to suppress the wear of the contact surface of the vane roller by improving the performance of the compressor by improving the sealing property and improving the lubricating characteristics.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. It should be noted that the same components as those of the related art are designated by the same reference numerals and detailed description thereof will be omitted.

In FIGS. 1 and 2, 1 to 13 have the same functions as those of the conventional device. Reference numeral 19 is a sub-bearing, which is arranged so that a part of the sub-bearing is immersed in the refrigerating machine oil 13. One end of the suction passage 14 is provided inside the auxiliary bearing.
An oil supply hole 16 is provided so that the other end opens to the refrigerating machine oil 13.

Next, the operation of the oil supply device according to the present invention will be described. When the crank 3 is driven by the electric motor element 12 in FIGS. 1 and 2, the pressure in the cylinder low-pressure chamber and the suction passage decreases by about 0.2 kg / cm ² from the pressure in the closed casing due to the change in volume. The refrigerating machine oil accumulated at the bottom of the closed casing due to this pressure decrease is supplied into the cylinder through the oil supply hole 16. A part of the refrigerating machine oil supplied to the cylinder is supplied to the end surface of the roller 6 and leaks to the inside of the roller 6. Further, a part is supplied to the vane 9 and the vane groove 17, and the rest is supplied from the high pressure chamber 8 to the discharge pipe 18.
Is discharged through a high pressure pipe (not shown). By supplying the refrigerating machine oil 13 to the inside of the roller 6 and the vane groove 17, the gas sealing property is improved, which contributes to the performance improvement.
However, when the refrigerating machine oil 13 discharged from the high-pressure chamber 8 and flowing out to the high-pressure pipe (not shown) increases in capacity, it is necessary to adjust the outflow amount of the refrigerating machine oil. It can be controlled by adjusting.

[0012]

As described above, in the oil supply apparatus of the present invention, the auxiliary bearing or main bearing or a part of the cylinder is arranged so as to be immersed in the refrigerating machine oil accumulated at the bottom of the closed casing. Alternatively, one end is not opened in the cylinder, and the other end is opened in the refrigerating machine oil accumulated in the bottom of the closed casing. It is possible to stably supply oil into the cylinder at low cost without increasing the cost, improve the performance of the compressor by improving the sealing property, and suppress the abrasion of the contact surface of the vane roller by improving the lubricating characteristic.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a low-pressure rotary refrigerant compressor according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of the low-pressure rotary refrigerant compressor of the present invention.

FIG. 3 is a vertical sectional view of a conventional low-pressure rotary refrigerant compressor.

[Explanation of symbols]

 1 Airtight casing 2 Cylinder 3 Crank 4 Main bearing 6 Roller 7 Low pressure chamber 8 High pressure chamber 9 Vane 13 Refrigerating machine oil 14 Suction path 16 Oil supply hole 19 Secondary bearing

Claims (1)

[Claims] 1. A hermetically sealed casing, a cylinder housed in the hermetically sealed casing, a main bearing and a sub bearing fixed to both ends of the cylinder, and a main bearing and a sub bearing rotatably housed in the crank. A roller that eccentrically rotates in the cylinder, a vane groove provided in the cylinder, and a vane that reciprocates in the vane groove and abuts the roller to divide the inside of the cylinder into a low pressure chamber and a high pressure chamber. A mechanism for operating the pressure inside the closed casing at a pressure similar to the suction gas pressure, and the sub-bearing or main bearing or a part of the cylinder is arranged so as to be immersed in the refrigerating machine oil accumulated at the bottom of the closed casing. Then, one end of the auxiliary bearing, the main bearing, or the cylinder is opened to the suction passage, and the other end is collected in the bottom of the closed casing. An oil supply device for a low-pressure rotary refrigerant compressor, comprising an oil supply hole opened therein.