JPS62197675A - Compressor for refrigerant - Google Patents

Abstract

PURPOSE:To make a stable lubrication to a bearing unit of a shaft, by providing a projecting plate projecting upwardly in an axial direction at the bottom of a closed casing housing a machine unit and a motor and preventing the rotation of lubricating oil by the projecting plate. CONSTITUTION:A motor 2 and a machine unit 5 are housed in a closed casing 1. When a rotor 3 and a shaft 9 rotate, refrigerant is introduced into a compressing chamber 8 from an inlet hole 6 through an inlet pipe 12. The refrigerant is gradually compressed, discharged into the casing 1 through a discharge hole 7 once and then discharged through a discharge pipe 13. Further, lubricating oil 14 staying on the bottom of the casing 1 is supplied to a bearing unit 11 through a lubricating hole 10 of a shaft 9. There is provided a projecting plate 15 projecting upwardly in an axial direction at the bottom of the closed casing 1 in the arrangement mentioned above. Thus, rotation of the lubricating oil 14 is prevented by the projecting plate 15 and the lubricating hole 10 is immersed in the lubricating oil 14 at all times, whereby lubrication to the bearing portion of the shaft 9 is stabilized.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a refrigerant compressor used in a refrigeration cycle or the like.

BACKGROUND OF THE INVENTION In recent years, refrigerant compressors have become increasingly efficient and low-noise.

An example of the above-mentioned refrigerant compressor will be described below with reference to the drawings.

FIGS. 4 and 5 show cross-sectional views of conventional refrigerant compressors. FIG. 4 shows the cross section during operation, and FIG. 5 shows the cross section during stoppage.

4 and 6, 1 is a sealed casing, 2 is a motor, and the motor 2 has a rotor 3. It consists of a stator 4. A mechanical part 6 is fixed to the upper part of the motor 2, and has a suction hole 6. Discharge hole7. It has a compression chamber 8. A shaft 9 has an oil supply hole 1° and is supported by a bearing 11 of the mechanical part 5. Further, 12 is a suction pipe, and 13 is a discharge pipe.

Further, a broken line A indicates the height of the lubricating oil 140 oil level.

The operation of the refrigerant compressor configured as above will be described below.

First, rotor 3. As the shaft 9 rotates, the refrigerant is drawn into the compression chamber 8 from the suction hole 6 via the suction pipe 12, is gradually compressed, and is once discharged from the discharge hole 7 into the sealed casing 1, and then is discharged from the discharge pipe 13. be done. Furthermore, the lubricating oil 14 accumulated at the bottom of the sealed casing 1 is supplied to the bearing portion 11 through the oil supply hole 10 of the shaft 9 for lubrication.

Problems to be Solved by the Invention However, in the above configuration, the lubricating oil is stirred by the rotation of the rotor, and the oil level near the center of the shaft is low, and the oil level on the outside in the radial direction is high. If oil returns poorly into the sealed casing, the oil level near the center will be lower than the bottom end of the shaft, which will prevent lubricating oil from being supplied to the bearing from the shaft's oil supply hole, resulting in seizure of the bearing. It had

To provide a refrigerant compressor in which the oil supply hole at the lower end of the shaft is always immersed in lubricating oil, and the shaft bearing part is stably supplied with oil to prevent seizure of the bearing part.

Means for Solving the Problems In order to solve the above problems, the refrigerant compressor of the present invention has a protruding plate that protrudes in the axial direction attached to the lower part of the sealed casing.

Effect: With the above-described configuration, the rotation of the lubricating oil generated by the rotation of the rotor is suppressed by the protruding plate, and the difference between the oil level near the center of the shaft and the oil level on the outside in the radial direction is reduced. Since the oil supply hole at the lower end of the shaft is always immersed in lubricating oil, the bearing can be stably supplied with oil and the bearing of the shaft can be prevented from seizing.

EXAMPLE Hereinafter, a refrigerant compressor according to an example of the present invention will be described with reference to the drawings.

1 to 3 show cross sections of a refrigerant compressor in an embodiment of the present invention.

In FIGS. 1 and 2, reference numeral 16 denotes a protruding plate that protrudes from the bottom of the sealed casing upward in the axial direction and is fixed to the sealed casing by welding or the like.

The operation of the refrigerant compressor configured as above will be explained.

The height of the oil level is uniform when the shaft is stopped, but when the operation starts, the lubricating oil starts to rotate as the rotor 3 rotates, but the flow is blocked by the protruding plate 15, and the height of the oil level at the center of the shaft is equal to the radius. The oil level is only slightly lower than the oil level on the outside.

Therefore, the oil supply hole at the lower end of the shaft is always immersed in lubricating oil, which enables stable oil supply to the bearing part of the shaft 9 and prevents seizure of the bearing part. According to the embodiment, by attaching a protruding plate fixed to the lower part of the sealed casing so as to protrude from the bottom in the axial direction, the protruding plate prevents the rotation of the lubricating oil, and the oil supply hole at the lower end of the shaft is prevented from rotating. is always submerged in lubricant,
Stable oil supply to the bearing portion of the shaft can be performed, and seizing of the bearing portion can be prevented.

Effects of the Invention As described above, the present invention provides a protruding plate fixed to the lower part of the sealed casing so as to protrude upward in the axial direction from the bottom. The lubricating hole at the lower end of the shaft is always immersed in lubricating oil, allowing stable lubricating to the bearing portion of the shaft and preventing seizure of the bearing.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a refrigerant compressor in operation according to an embodiment of the present invention, FIG. 2 is a sectional view taken along I-I in FIG. 1, and FIG. 3 is a sectional view showing the refrigerant compressor in FIG. 1 stopped. A sectional view showing the inside,
FIG. 4 is a cross-sectional view of the conventional refrigerant compressor while it is in operation, and FIG. 5 is a cross-sectional view of the refrigerant compressor of FIG. 4 while it is stopped. 1... Sealed casing, 2... Motor, 3... Mark 0-1.6... Mechanical part, 9...
...Shaft, 1o... Oil supply hole, 11...
...Bearing part, 14...Lubricating oil, 16...
・Protruding plate. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 5

Claims (1)

[Claims] A refrigerant compressor that houses a mechanical part and a motor in a sealed casing, and includes a protruding plate fixed to a lower part of the sealed casing so as to protrude upward in the axial direction from the bottom.