JPS6131685A - Compressor - Google Patents

Abstract

PURPOSE:To prevent abnormal abrasion at each sliding section by providing an insulator between the bearing and the compressor then applying voltage between the rotary shaft and the bearing and detecting contact between the rotary shaft and the bearing from the variation of voltage or current while providing a mechanism for modifying the operating conditions. CONSTITUTION:Returning flow and circulating amount of lubricant to the inside/ outside of container 111 with vary with correspondence to the operating time of compressor, outer air temperature, operatin conditions, etc. and upon contact of the rotary shaft 105 with upper bearing 102 welded with an insulator 103 to the lower endface when sufficient amount of lubricant can not be assured in the container 111, the conductors 112 and 113 will conduct through the sliding section of compressor thus to vary the voltage to be applied across the resistor 118. Existence and the degree of metallic contact is decided through decision circuit on the basis of said voltage variation to modify the operating conditions through compressor controller or stop the operating conditions as required. Consequently, the bearing section can be protected under any environment to prevent abnormal abrasion caused by insufficient lubrication thus to prevent deterioration of sealing performance and to improve the compressor efficiency.

Description

[Detailed description of the invention] [Technical field to which the invention pertains] The present invention relates to a compressor.

[Prior art and its problems]

Conventionally, in a compressor that sucks in gas, increases the pressure, and then discharges it, for example, a refrigerant gas compressor used in an air conditioner, etc.
There is a compressor that has an electric motor integrated into the container. A conventional compressor will be explained based on one embodiment.

FIG. 4 shows a conventional compressor. 1 is a rotating shaft, which is connected to the rotor 2 and is driven by an electric motor section consisting of the rotor 2' and the stator 3, and rotates the piston 4 eccentrically to cool the refrigerant gas sucked through the suction pipe 5. is compressed and discharged from the discharge valve 6 into the container. The rotating shaft is supported by an upper bearing 7 and a lower bearing 8 of the compressor section, and lubricating oil sealed in a container is used to lubricate the bearings and the sliding parts of the compressor section. When being discharged out of the container via the discharge pipe 9, the cylinder 1
The lubricating oil leaked into the space surrounded by the piston 4 and the piston 4 is discharged from the discharge valve in the form of a mist, and the lubricating oil floating inside the container may also be discharged out of the container together with the refrigerant. In the worst case, the lubricating oil There have been cases where bearings have been burnt out due to insufficient quantity.

[Purpose of the invention]

The present invention eliminates the above-mentioned difficulties and prevents the bearing from burning out even under high-speed operation by detecting the lubrication state of the bearing. By preventing abnormal wear of the compressor, the compression efficiency is prevented from decreasing.
The purpose is to improve efficiency over a long period of time.

[Summary of the invention]

In order to achieve the above object, the compressor of the present invention has a circuit that detects metal contact between a bearing and a rotating shaft and changes operating conditions.

〔Effect of the invention〕

By detecting contact between the bearing and the rotating shaft, burnout accidents of the bearing can be prevented. By preventing abnormal wear of the sliding parts of the compressor, compression efficiency can be prevented from decreasing, and efficiency can be improved over time. The reliability of the compressor can be increased.

[Embodiments of the invention]

#JLF! A. That is, in a space surrounded by the cylinder 101 and the insulator 103 and the lower bearing 104 provided between the cylinder 101 and the upper bearing 102, a piston 106 eccentrically rotated by a rotating shaft 105 is provided, and the suction pipe 10
7, a compressor section that sucks in refrigerant gas, compresses the refrigerant gas with the piston 106, and discharges it from the discharge valve 108, and a rotor 109 connected to the rotating shaft that drives the rotating shaft 105. A motor section including a stator 110 and the like are provided in a closed container 111, and a conductive wire 112 is connected to the upper bearing 102 and a conductive wire 113 is connected to the closed container 111. Upper bearing 102, cylinder 101, and insulator 10
3 is fastened with a bolt 114, and a collar body 5 is provided between the bolt 114 and the cylinder 101. Further, the sealed container 111 is supported by vibration-proof rubber and insulated from the outside, and the upper bearing 102 is insulated by an insulator 103.1.
15 and is insulated from the cylinder. The compressor section has a grade 11 gas chamber that divides the gas chamber into a suction side and a compression side.
6 is provided, which is in contact with the rotation axis ios. FIG. 3 shows a circuit for detecting metal contact between the upper bearing 102 and the rotating shaft 105.
A compressor, a power source, a resistor 117, etc. are connected in series, and a resistor 118 is connected in parallel to the resistor 118, which is further connected to a metal contact determination circuit and a compressor controller circuit. "J correction cylinder 101, upper bearing 10
2. The rotating shaft/heavistone 106 is made of conductive material such as iron.

The rotation of the rotating shaft 105 causes the piston 106 to perform an eccentric rotational movement, sucking in refrigerant gas through the suction pipe 107, compressing it, and discharging it from the discharge valve 108. The gas discharged into the container is discharged outside the container via the discharge pipe 119.

At this time, the lubricating oil that has left inside the cylinder is also discharged from the discharge valve in the form of a mist, and may be discharged out of the container together with the refrigerant. The lubricating oil discharged outside the container passes through the mechanical piping system that constitutes the refrigeration system, such as a heat exchanger, and returns to the sealed container 111. The amount of lubricating oil returned to the container varies depending on the compressor's operating speed and its history, operating conditions such as outside temperature, and operating conditions, and there may be cases where it is not possible to secure a sufficient amount of lubricating oil in the container. When the rotating shaft 105 and the upper bearing come into contact with each other, the conductive wire 112 and the conductive wire 113 are electrically connected through the compressor sliding portion, and the voltage applied to the resistor 118 fluctuates. The compressor of the present invention uses a determination circuit to determine the presence or absence and degree of metal contact based on this voltage fluctuation, and the compressor controller 2 changes operating conditions and, in some cases, suspends operation. . In other cases, for example, under operating conditions where the suction pressure is extremely low, the temperature increases significantly due to an increase in the compression ratio, a decrease in the cooling capacity of the compressor due to a decrease in the amount of suction refrigerant, and the viscosity of the lubricating oil decreases, causing damage to the bearings. This book is also effective when rotating shafts come into contact with each other, and protects the bearing even under any unconditional or adverse environment.

Furthermore, if the lubrication condition of the bearing section is severe, the sliding condition of the compressor section will also be severe, but in the compressor shown in the present invention, abnormal wear due to poor lubrication is prevented. Prevents deterioration of sealing performance and improves compressor efficiency over time.

In this embodiment, the connection between the cylinder 101, the insulator 103, and the upper bearing 102 is described as 114. However, the connection between the cylinder 101, the insulator 103, and the upper bearing 102 does not have to be by fasteners such as bolts, but may also be done by other methods such as using adhesive. 115 will no longer be necessary.

Further, in this embodiment, the potential is applied to the rotating shaft through the container and the sliding part of the compressor part, but the potential may be applied directly to the rotating shaft using a brush or the like.

Further, similar effects can be obtained even if the above functions are performed on the lower bearing 104.

The insulator 103 may be formed by vapor depositing, sputtering, or welding an insulating material on the lower end surface of the upper bearing 102, the upper end surface of the eccentric cam portion of the cylinder 101, the piston 106, and the rotating shaft 105, or both thereof.

The insulator is preferably a wear-resistant material, such as a ceramic with low conductivity.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view of a compressor showing an embodiment of the present invention, FIG. 2 is a cross-sectional view of a compressor section showing an embodiment of the present invention, and FIG. 3 is a cross-sectional view of a compressor portion showing an embodiment of the present invention. Metal contact detection circuit diagram showing
FIG. 4 is a longitudinal sectional view showing a conventional compressor. 101... Cylinder, 102... Upper bearing, 103...
··Insulator. 105... Rotating shaft, 107... Suction pipe, 108...
・Discharge valve. 109...Rotor, 110...Stator. Agent: Patent attorney Noriyuki Chika (and 1 other person) Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] A compressor unit that sucks in gas, increases the pressure, and discharges it;
In a compressor that is connected to the compressor section by a rotating shaft and includes an electric motor section or the like for driving the compressor section in a closed container, an insulator is provided between a bearing and the compressor section, and the rotating shaft and A compressor characterized by having a mechanism for applying voltage between a bearing and detecting contact between the rotating shaft and the bearing based on fluctuations in voltage or current, and changing operating conditions.