JPH03149366A - Oil feeder for compressor - Google Patents

Abstract

PURPOSE:To perform quick oiling to every sliding part even at time of restarting of a compressor as well as to prevent any coagulative abrasion and a lock phenomenon or the like from occurring by installing an oil pocket in the midway of an oil-up passage. CONSTITUTION:Since an oil pocket 12 is formed in the midway of an oil-up passage 7 of a turning shaft 5, lubricating oil is always filled up even in this oil pocket 12 at a time when the lubricating oil goes up in the oil-up passage 7 during operation of a compressor. When the compressor is stopped afterward, the lubricating oil in the passage 7 is gradually dropped to a bottom part of an enclosed case 2 with its gravity, but the lubricating oil in the oil pocket 12 remains after being collected intact. When the compressor is restarted from this state, oiling is made possible to start oiling to every sliding part so quickly from the oil pocket 12 being situated in a more fairly upper position than an oil sump part on a bottom part of the enclosed case 2. Consequently, circulation of the lubricating oil of restarting is quickened and, what is more, any coagulative abrasion and a lock phenomenon in the sliding part are all avoidable.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to an oil supply device for a compressor used in refrigerators, showcases, and the like.

(b) Conventional technology Conventionally, the oil supply system for this type of compressor was
As described in Publication No. 27, etc., a compressor section is housed in the upper part of the airtight case, and an electric motor section for driving the compressor section is housed in the lower part of the closed case, and these two parts are connected by a rotating shaft. An oil upstream passage, an oil hole communicating with this passage, an opening at the upper end, etc. are formed in the axial direction of this rotating shaft, and the lubricating oil stored at the bottom of the sealed case is pumped by the centrifugal pump action accompanying the rotation of the rotating shaft. The oil is dispersed from the oil hole to the bearing section and from the upper end opening, and is supplied to the compressor section, etc.

(c) Problems to be Solved by the Invention However, according to the above configuration, when the compressor stops operating, the lubricating oil that has been rising in the oil upstream passage of the rotating shaft will be absorbed by the viscosity of the solder. Although it adheres to each sliding part, most of it falls to the bottom of the sealed case due to gravity. Furthermore, if the stoppage time becomes long, the small amount of lubricating oil adhering to each sliding part will dry up due to the internal components, and most of the sliding parts will become completely dry.

If the compressor is restarted in this condition, the lubricating oil will adhere to each sliding part until the required amount of lubricating oil stored at the bottom is supplied to each sliding part via the oil upstream passage. There were problems with wear and slight locking.

The present invention has been made in view of these points, and provides a compressor that can quickly supply oil to each sliding part even when the compressor is restarted, and that does not cause adhesive wear or locking phenomena. The purpose is to provide a refueling device for.

(d) Means for Solving the Problems The present invention houses a compressor section in the upper part of a sealed case, and an electric motor part for driving the compressor part in the lower part, and connects these two parts with a rotating shaft. An oil passage is formed in the axial direction of this rotating shaft, and the lubricating oil stored at the bottom of the sealed case is supplied to the bearing section, compressor section, etc. by the centrifugal pump action of the shaft. , an oil pocket is provided in the middle of the oil upstream passage.

(E) Function The compressor oil supply device of the present invention can store lubricating oil in the oil pocket even after the compressor has stopped due to the above-described configuration, and this oil pocket 1- is located midway in the oil-F passage. In other words, since it is located far above the bottom of the sealed case, each sliding part can be quickly refilled with oil from the oil pocket when restarting the compressor, thereby preventing adhesive wear and tear on the sliding parts when restarting the compressor. The locking phenomenon can be avoided.

Go to 1) Example Embodiments of the present invention will be described below based on the drawings.

l denotes a compressor section 3 in the second part of a sealed case 2 with lubricating oil stored at the bottom, and an electric motor section 4 for driving the compressor section in the lower part.
This is a hermetic electric compressor in which both the machine parts 3 and 4 are connected by a rotating shaft 5. This compressor has an oil-F passage 7 (which becomes a spiral groove on the outer circumferential surface from the upper center part) in the axial direction of the rotating shaft 5, and an oil-F passage that communicates with this oil-flow passage and opens into the bearing part 6. The hole 8 and the opening IO are formed at the upper end of the crank pin portion 9 and communicate with the oil upstream passage 7, respectively, and the centrifugal pump action caused by the rotation of the shaft causes the oil to flow into the bottom of the sealed case 2. The stored lubricating oil is raised along the oil-slip passage 7 and supplied to the bearing part 6 from the oil hole 8, while the piston 11 constituting the compressor part 3 is supplied from the negative end opening 10 of the crank pin part 9. It is scattered on the sliding surface.

In the middle of the oil upstream passage 7, there is an oil pocket I which is bored by cutting from the crank pin portion 9 side.
A groove 12 is formed.

In the compressor oil supply device configured as described above, since an oil pocket 12 is formed in the middle of the oil upstream passage 7 of the rotating shaft 5, lubricating oil is supplied to the inside of the oil-filled passage 7 during operation of the compressor. When the lubricating oil is rising, the oil pocket 12 is always filled with lubricating oil. After that, when the compressor stops, the lubricating oil in the oil upstream passage 7 will gradually fall to the bottom of the sealed case 2 due to gravity, but the lubricating oil in the oil pocket 12 will remain in the stored state. It happens. When the compressor is restarted from such a state, supply of oil to each sliding part can be immediately started from the oil pocket 12 located at a position considerably above the oil reservoir at the bottom of the sealed case 2. As a result, the lubricating oil can circulate quickly during restart, and adhesive wear and locking of the sliding parts can be avoided.

In addition, since the oil pocket 12 is recessed with respect to the oil upstream passage 7, impurities such as metal powder and dirt contained in the oil can be precipitated. Since only the pure lubricating oil in 12 can be supplied immediately, the wear resistance of each sliding part can be improved.

In this embodiment, an oil pocket 1 is provided on the rotating shaft 5.
2 has been described, however, the same effect can be obtained even if the bearing portion 6, the rotor 13, etc. are formed with the oil upstream passage 7 and the communication I~, and this does not deviate from the present invention in any way. .

g) Effects of the Invention As described above, according to the present invention, lubricating oil is stored in the oil pocket formed at a position considerably above the oil reservoir at the bottom of the sealed case, so that when the compressor is restarted, It is possible to quickly supply oil to each sliding part from the oil pocket, and it is possible to avoid adhesive wear and locking of the sliding parts at the time of restart.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a hermetic electric compressor showing an embodiment of the present invention, and FIG. 2 is a sectional view of a main part of an oil supply device. 5...Rotating shaft, 6...Bearing section, 7...Oil upstream passage, 12...Oil pocket.

Claims (1)

[Claims] (1) The compressor unit is housed in the upper part of the sealed case, and the electric motor unit that drives the compressor unit is housed in the lower part, and these two parts are connected by a rotating shaft, and the oil rises in the axial direction of this rotating shaft. An oil pocket is provided in the middle of the oil upstream passageway in which lubricating oil stored at the bottom of the sealed case is supplied to the bearing section, compressor section, etc. by the centrifugal pump action of the shaft. A compressor oil supply device characterized by: