JPH01203693A - Horizontal rotary type compressor - Google Patents

Abstract

PURPOSE:To prevent seizure by providing a lubricating oil-sucking hole to be drilled in a main bearing and a subbearing while a rotary shaft to be formed hollow and a spiral groove in the rotary shaft in its subbearing and main bearing sides. CONSTITUTION:A subbearing 2 provides a lubricating oil-sucking hole 10 to be drilled, and hollow forming a rotary shaft 4, delivered gas to a delivery chamber 3 is guided to space 6 in an end part of an electric drive element 5 through this hollow part 4a. Spiral grooves 11, 13 are provided in the rotary shaft 4 in its sides of the subbearing 2 and a main bearing 12. Thus eliminating the necessity for providing a delivery gas communicating pipe in the outside of a compressor as in the past, while by pumping action of the spiral groove 11 in the side of the subbearing 2, lubricating oil can be discharged. Further thrust force in the axial direction, generated by the pumping action, is negated by the spiral groove 13, and the necessity for a thrust bearing is eliminated. Accordingly, seizure can be prevented with no generation of shortage of the lubricating oil.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a horizontal rotary compressor that is incorporated into an air conditioner, a refrigerator, etc., and particularly relates to a horizontal rotary compressor with an improved oil supply device.

Conventional technology Conventionally, in this type of rotary compressor, the level of lubricating oil stored inside the rotary compressor is set to a level that prevents the rotor of the electric element from being immersed in the lubricating oil. Since the amount of lubricating oil becomes very small, there is a risk that the lubricating oil will foam during startup, etc., resulting in a lubricant shortage.

Therefore, a description will be given below with reference to FIG. 3 showing a conventional example. In the figure, the gas compressed by the compression element 1 is directly guided to the electric element 5 side through a pipe 12 provided outside the compressor, and the level of lubricating oil 9 is adjusted by slightly increasing the pressure on the electric element 5 side. It is made to be low on the electric element s side and high on the compression element 1 side.

Problems to be Solved by the Invention However, in this configuration, since the pipe 12 is provided outside the compressor, there are problems in that it lacks compactness and increases cost.

In order to solve this problem, as shown in FIG. Since the pressure at the lubricating oil inlet 10 is higher than that at the lubricating oil inlet 10, the lubricating oil 9 cannot flow between the rotating shaft 4 and the sub-bearing 2, and there is a risk of seizure occurring in this area.

The present invention has been made based on the above-mentioned circumstances, and is a horizontal rotary type that solves the problem of lubrication when the gas compressed by the compression element is guided to the electric element side through the hollow part of the rotating shaft. Provide compressors.

Means for Solving the Problems The present invention stores an electric element, a compression element driven by the electric element, and lubricating oil for lubricating the compression element in a closed container, and the electric element and the compression The elements are connected in the lateral direction, and the compression element has a main bearing on the electric element side fixed to both end faces thereof, a sub bearing on the opposite side thereof, and a rotating shaft supported by these both bearings, A lubricating oil suction hole is bored in the bearing or the sub-bearing, and the rotating shaft is made hollow so that the gas compressed by the compression element is guided through the rotating shaft to the electric element side, and the gas is guided to the sub-bearing and main bearing side. It is constructed by providing a spiral group on the rotating shaft.

Function: In the horizontal rotary compressor of the present invention configured as described above, when the rotating shaft driven by the electric element rotates, a known pump is generated between the auxiliary bearing and the spiral group provided on the corresponding rotating shaft. The lubricating oil is sucked up from the lubricating oil suction hole where the pressure is low and is discharged into the discharge chamber at the end of the secondary bearing where the pressure is high. The thrust in the axial direction is canceled out by the thrust in the axial direction generated by the spiral group provided on the main bearing side, making a thrust bearing unnecessary. Therefore, there is no shortage of lubricating oil between the sub-bearing and the rotating shaft, and troubles due to seizure can be prevented.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view of an embodiment of the present invention. In the figure, gas compressed by a compression element 1 passes through a discharge valve (not shown) provided on a sub-bearing 2 and is discharged to a discharge chicken bar 3. After the gas discharged into the discharge chamber 3 passes through the hollow part 4 of the rotating shaft 4 and is guided to the space 6 at the end of the electric element 5,
It passes through the gap provided between the electric element 5 and the closed container 7, returns to the compression element 1 side, and is discharged out of the compressor from a discharge pipe 8 provided on the compression element side. Since the gas is accompanied by a pressure drop when passing through this gap, the pressure on the compression element 1 side is lower than in the discharge chamber 3 or the space 6 on the electric element side. Therefore, the level of the lubricating oil 9 in the closed container 7 is lower on the electric element 5 side and higher on the compression element 1 side. Even if the amount of lubricating oil is increased in this way, it is possible to prevent the rotor 5 of the electric element 5 from being soaked in the lubricating oil 9. In addition, the lubricating oil 9 sucked in from the lubricating oil suction hole 10 provided on the side of the compression element where the pressure is low is boosted in pressure by the pumping action generated between the sub-bearing 2 and the spiral group 11, and is pumped into the discharge chamber 3 where the pressure is high. Since the lubrication between the secondary bearing 2 and the rotating shaft 4 is discharged to This is canceled out by the axial thrust generated by the spiral group 13, making a thrust bearing unnecessary. Therefore, there is no shortage of lubricating oil between the secondary bearing 2 and the rotating shaft 4, and troubles due to seizure can be prevented.

As described in detail, the horizontal rotary compressor of the present invention eliminates the need to provide a discharge gas communication pipe outside the compressor, unlike conventional compressors, and the pumping action of the spiral group on the sub-bearing side improves lubrication. Since the oil is discharged, there is no problem with the lubrication between the sub-bearing and the rotating shaft, and the spiral group provides the main bearing side with the axial thrust generated by the pump action generated on the sub-bearing side. This is canceled out by the axial thrust generated by the thrust bearing, making a thrust bearing unnecessary.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing one embodiment of the present invention, FIG. 2 is a sectional view showing a conventional example, and FIG. 3 is a sectional view showing another conventional example. 1...Compression element, 2...Sub bearing, 1o
...Suction hole, 4F...Hollow part, 11.
...Spiral group, 12 ... Main bearing, 13 ... Spiral group.

Claims (1)

[Claims] An electric element, a compression element driven by the electric element, and lubricating oil for lubricating the compression element are housed in a closed container, and the electric element and the compression element are connected in a lateral direction, and the compression element is has a main bearing on the electric element side fixed to both end faces, a sub-bearing on the opposite side, and a rotating shaft supported by both bearings, and a lubricating oil suction hole is drilled in the main bearing or the sub-bearing. At the same time, the rotary shaft is made hollow, and the gas compressed by the compression element is discharged through the rotary shaft to the side end of the electric element, and then passed through the gap between the closed container and the electric element, and then A horizontal rotary compressor that discharges air through a discharge pipe provided on the compression element side of the compressor, and that a spiral group is provided on the rotating shaft on the main bearing and sub-bearing sides.