JP2002339887A - Hermetic compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To return the oil, after having been drawn up from an oil pool on the bottom of a hermetic container and used, to the oil pool efficiently and to position a motor rotor and a stator precisely. SOLUTION: The used oil is efficiently returned to the oil pool by forming an oil return hole in the outer peripheral part of a sub bearing frame. The hole is formed at a position opposite to a positioning marking part of the motor stator of the sub bearing frame.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic compressor used for refrigeration and air conditioning systems for business use, home use, vehicles, etc., or refrigerators.

[0002]

2. Description of the Related Art A conventional hermetic compressor will be described with reference to the drawings, taking a scroll compressor as an example. 3 is a sectional view showing a conventional hermetic compressor. Reference numeral 1 denotes a sealed container, in which a compression mechanism 2, an electric motor 3, a crankshaft 4 for transmitting the rotational force of the electric motor 3 to the compression mechanism 2, a sub-bearing 8 for bearing the crankshaft 4, and an inner wall of the sub-bearing 8. And a sub-bearing frame 9 for separating the flow of the refrigerant from the oil 6 in the oil reservoir 20 provided below. Closed container 1
The oil 6 in the oil reservoir 20 provided at the bottom of the
, And supplied to the bearing portion 5 and the sliding portion of the compression mechanism 2 through the oil supply hole 10. The refrigerant gas compressed by the compression mechanism 2 is once discharged into the closed container 1,
After being cooled by contacting the surface of the electric motor 3, the electric motor 3 is discharged to the outside of the closed container 1. The oil supplied to the bearing unit 5 and the sliding part of the compression mechanism 2 and used for lubrication can be moved downward by the supply pressure or gravity to be naturally collected in the oil reservoir 20.

[0003]

Such a conventional scroll compressor has the following problems. That is, the oil that has flowed down and dropped under the main bearing member 11 accumulates on the outer peripheral portion of the sub-bearing frame 9 due to the centrifugal force generated by the rotation of the rotor 3 b of the electric motor. Since there is no hole for the oil reservoir, it is difficult to return to the oil reservoir 20. When magnetizing the electric motor 3, it is necessary to match the magnet position of the rotor 3b with the slot position of the stator 3a. However, the magnet position and the slot position can be visually checked by being interrupted by the sub-bearing frame 9. There was a problem that it was difficult and could not be accurately positioned.

[0004]

According to the present invention, there is provided a hermetic compressor comprising a compression mechanism in a closed container, an electric motor for driving a compression mechanism provided below the compression mechanism, and a rotational force of the electric motor. A crankshaft for transmitting to the compression mechanism, a sub-bearing for bearing the crankshaft on the anti-compression mechanism side of the electric motor,
An auxiliary bearing frame that fixes the auxiliary bearing to the closed container and separates the flow of oil and refrigerant from the oil reservoir provided in the lower part, and slides the oil through the oil supply hole provided in the crankshaft to the crankshaft bearing and compression mechanism. And a refueling mechanism for refueling the sub bearing frame, and an oil return hole is provided in an outer peripheral portion of the sub bearing frame. With such a configuration, when the oil supplied to the bearing portion or the sliding portion of the compression mechanism moves downward due to the supply pressure or gravity, the outer peripheral surface of the sub bearing frame is centrifugally generated by the rotation of the rotor. Even if it gathers in the area, it can be efficiently returned to the oil reservoir.

Further, by providing a hole at a position where the rotor magnetizing alignment marking portion of the motor can be seen from the sub-bearing side of the sub-bearing frame, when magnetizing the motor, the magnet position of the rotor and the slot of the stator are set. The position can be accurately adjusted and the motor efficiency can be improved.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing a hermetic compressor according to an embodiment of the present invention, and FIG. 2 is a sectional view taken along the line AA in FIG.

The scroll compression mechanism according to the present embodiment includes a main bearing member 11 fixed in a sealed container 1 by welding or shrink fitting, a fixed scroll 12 bolted to the main bearing member 11, a fixed scroll 12 And a revolving scroll 13 that forms a compression chamber 15 by being engaged with the main bearing member 11 and the fixed scroll 12. A rotation preventing means 14 such as an Oldham ring is provided between them. The orbiting scroll 13 is provided with a bearing portion slidably fitted to the eccentric shaft portion 4 a at the center of the back surface, and performs a turning motion without rotation by rotation of the crankshaft 4. By utilizing the fact that the compression chamber 15 formed between the fixed scroll 12 and the orbiting scroll 13 becomes smaller while moving from the outer peripheral side to the center, the refrigerant gas sucked from the inlet 17 is compressed, The pressure of the refrigerant gas becomes higher than the fixed scroll 12
The reed valve 19 is repeatedly pushed and opened from the discharge port 18 at the center of the container to discharge the gas into the closed container 1.

The lower end of the crankshaft 4 reaches an oil reservoir 20 at the bottom of the closed casing 1, and is supported by a sub-bearing 8 attached to a sub-bearing frame 9A fixed in the closed casing 1 with mounting screws or the like. .

The electric motor 3 is located between the main bearing member 11 and the sub-bearing frame 9A, and is fixed to the closed casing 1 by shrink fitting or the like, and a rotor 3b connected to the crankshaft 4. The balance weights 23 and 24 fixed by pins 22 are provided on the outer peripheral portions of the upper and lower end surfaces of the rotor 3b. Thus, the rotor 3b
In addition, the crankshaft 4 rotates stably, and the orbiting scroll 13 can stably move in a circular orbit.

An oil supply mechanism 7 supplies oil 6 in an oil reservoir 20 by a pump 25 disposed at a lower end of the crankshaft 4.
The oil is supplied to the bearing part 5 and each sliding part of the compression mechanism 2 through the oil supply hole 10.

The oil 6, which has been used for lubrication and sealing at the bearings and the sliding parts of the compression mechanism, flows under the main bearing member 11 through the bearings 5 in such a manner that a relief area is obtained by supply pressure or gravity. Drip and finally oil reservoir 20
Will be collected.

However, in practice, as described above, the oil that has flowed under the main bearing member 11 and has been dripped is not supplied to the rotor 3b.
The problem is that the centrifugal force caused by the rotation of the shaft causes the oil to accumulate on the outer peripheral portion of the sub-bearing frame 9 and hardly return to the oil reservoir 20.
Further, when magnetizing the electric motor 3, it is necessary to match the position of the magnet of the rotor 3b with the position of the slot of the stator 3a.

In the embodiment shown in FIG. 1, an oil return hole 26 is provided in the outer peripheral portion of the sub-bearing frame 9 in order to solve such a problem. In such a configuration, the oil 6 after being supplied to the bearing portion 5 and the sliding portion of the compression mechanism 2 moves downward by the supply pressure and gravity, and the oil is supplied to the rotor 3.
It accumulates on the outer peripheral surface of the sub bearing frame 9 due to the centrifugal force caused by the rotation of b. The oil 6 accumulated on the outer peripheral surface is supplied to the oil return hole 26 provided on the outer peripheral portion of the sub-bearing frame 9 by the oil return hole 26.
The oil can be returned to the oil reservoir 20 efficiently.

In the embodiment shown in FIG. 2, a slot confirmation hole 27 is provided in the sub bearing frame 9 at a position where the slot 21 of the stator 3a of the electric motor 3 can be seen from the sub bearing frame 9 side. With such a configuration, when the electric motor 3 is magnetized, the magnet position of the rotor 3b and the slot position of the stator 3a can be accurately matched, and the motor efficiency can be improved.

[0015]

According to the first aspect of the present invention, the oil that has been supplied to the bearing portion and the sliding portion of the compression mechanism can be efficiently returned to the oil reservoir, thereby improving reliability. it can. Also, the amount of oil discharged from the closed container to the outside can be reduced, and the refrigerating capacity can be improved.

According to the second aspect of the present invention, when the motor is magnetized, the position of the magnet of the rotor and the position of the slot of the stator can be accurately matched, and the motor efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a hermetic compressor according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along arrows XX in FIG.

FIG. 3 is a sectional view showing a conventional hermetic compressor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Closed container 2 Compression mechanism 3 Electric motor 3a Stator 3b Rotor 4 Crankshaft 4a Eccentric shaft part 5 Bearing part 6 Oil 7 Oil supply mechanism 8 Sub-bearing 9 Sub-bearing frame (conventional example) 9A Sub-bearing frame (embodiment) Reference Signs List 10 oil supply hole 11 main bearing member 12 fixed scroll 13 orbiting scroll 26 oil return hole

 ──────────────────────────────────────────────────続 き Continued from the front page (72) Inventor Hirofumi Yoshida 1006 Kazuma Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. F term (reference) 3H029 AA02 AA14 AB03 BB03 BB32 BB33 CC04 CC07 CC09 CC27

Claims (2)

[Claims] 1. A compression mechanism is arranged in an upper space inside an airtight container having an oil reservoir at the bottom, and an electric motor is arranged below the compression mechanism. The compression mechanism is connected to the electric motor by a crankshaft that transmits torque. The crankshaft has an oil supply hole penetrating in the axial direction, and is rotatably supported by a sub bearing on the anti-compression mechanism side of the electric motor, and the sub bearing controls the flow of oil and refrigerant in the oil reservoir. The oil fixed to the inner wall surface of the sealed container by a sub-bearing frame configured to be separated is supplied to the bearing sliding portion and the compression mechanism sliding portion of the crankshaft via the oil supply hole through the oil supply hole. An oil return hole is provided in an outer peripheral portion of a sub-bearing frame. 2. The hermetic compressor according to claim 1, wherein the oil return hole is provided at a position facing the marking portion for positioning the magnetized rotor of the electric motor.