JPH1182329A - Scroll type compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scroll type compressor by which the movement of a rotary shaft can be prevented, and which can be stably operated, without mounting a movement preventing tool such as a wave washer onto an edge part of the rotary shaft, or slightly shifting a position of a rotor to a position of a stator. SOLUTION: In a scroll type compressor 1B where an oscillating scroll 42 which is revolved by the driving of an electric element 32, and comprises a boss hole part 43 connected with a pin part 41 decentered to a shaft center of a rotary shaft of the electric element 32 on a back face, is engaged with a fixed scroll 45, the inlet coolant gas is compressed to be discharged into a sealed container 31, and then the gas is discharged outside of the sealed container 31, a diameter of the rotary shaft 36 pivotted by a bearing part 37A is smaller than that of the pin part 41.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor mounted on, for example, an air conditioner or a refrigerator, and more particularly, to a plurality of scroll compressors formed by meshing a fixed scroll and an orbiting scroll. The present invention relates to a scroll compressor in which a compressed gas compressed in a compression chamber is discharged into a closed container and then discharged outside the closed container.

[0002]

2. Description of the Related Art A scroll type compressor 1A used in a refrigeration cycle of an air conditioner or the like has a structure shown in FIG. 2, for example. An electric element 2 and a scroll compression element 3 are provided inside a cylindrical closed container 1 having both ends closed.
And built-in. The electric element 2 is a closed container 1
A stator 4 fixed to the inner wall surface side of the
And a rotor 5 rotatably supported inside. A rotor shaft 6 is coupled to the rotor 5 in a penetrating state.
One end of the rotating shaft 6 is rotatably supported by a bearing portion 7A of a support frame 7 which constitutes a part of the scroll compression element 3. The other end of the rotating shaft 6 protrudes from the rotor 5, and an oil supply unit 8 is connected to the tip. An oil introduction pipe 9 is connected to an end of the oil supply section 8. The end on the suction side of the oil introduction pipe 9 is extended downward so as to be immersed in the lubricating oil b contained in the closed container 1.

An oil passage 10 is formed in the rotary shaft 6 in the axial direction so as to suck and supply the lubricating oil b from the oil supply unit 8, and the lubricating oil passes through the oil passage 10 to a bearing of the support frame 7. After being supplied to each sliding portion such as the portion 7A, it is recirculated.

[0006] One end of the rotary shaft 6 supported through the support frame 7 has a pin portion (crank portion) whose center is provided eccentrically with respect to the axis of the rotary shaft 6.
The orbiting scroll 12 is connected to the pin portion 11. This oscillating scroll 1
2 is formed in a disk shape, and a boss hole portion 13 to which the pin portion 11 is connected is formed in the center of one side surface. A spiral wrap 14 is integrally formed on the other side surface of the orbiting scroll 12.

[0005] A fixed scroll 15 is connected to the support frame 7. This fixed scroll 15
A spiral wrap 16 is formed at a portion facing the orbiting scroll 12, and a plurality of compression chambers 17 are formed between the spiral wrap 16 and the wrap 14.

The oil supply section 8 is mounted in the closed container 1 to support the end of the rotary shaft 6 and to have a sub-support frame 22 having a sub-bearing section 21 to which an oil introduction pipe 9 is mounted.
And a bearing 23 is interposed between the auxiliary support frame 22 and the rotary shaft 6.

The refrigerant gas introduced from the outside of the closed vessel 1 to the outer peripheral portion of the scroll compression element 3 via the suction pipe 18 is compressed in the compression chamber 17 and gradually moves to the center to increase the volume. The reduced scroll is discharged into the closed casing 1 from a discharge port 19 provided at the center of the other side surface of the fixed scroll 15, and the accompanying lubricating oil is separated in this space to reduce pulsation.

The compressed gas discharged from the discharge port 19 into the closed container 1 is supplied to the fixed scroll 1 as shown by a white arrow.
5 and a passage (not shown) provided in the support frame 7,
The lubricating oil in the refrigerant gas is further separated by the centrifugal force or the like generated by the rotation of the rotor 5 by going to the electric element 2 side, and the refrigerant gas from which the lubricating oil has been separated is discharged from the discharge pipe 20 to the outside of the closed casing 1. The separated lubricating oil flows as shown by the black arrows, accumulates at the bottom of the closed container 1, and is circulated for use.

The diameter D1 of the rotary shaft 6 at a portion rotatably supported by the bearing portion 7A is generally the same as that of the pin portion 1A.
1 is larger than the diameter D2. If D1 is made larger than D2, there is an advantage that after shrink-fitting the rotor 5 to the rotating shaft 6, it is inserted into the support frame 7 in the intermediate product to assemble the compressor. When a conventional scroll-type compressor is operated, a force directed in the direction of the scroll compression element 3 parallel to the rotating shaft 6 (force directed in the direction indicated by a white arrow on the rotating shaft 6) acts. 6 moves.

Therefore, in order to prevent such movement of the rotating shaft 6, an end of the rotating shaft 6 behind the bearing 23 is provided with a movement preventing tool 24 (A is a magnified explanation of a main part) comprising a wave washer and a retaining ring. There is a problem that it is necessary to take measures such as mounting the rotor 5 or slightly displacing the position of the rotor 5 from the position of the stator 4 to provide a step d.

[0011]

SUMMARY OF THE INVENTION It is an object of the present invention to attach a movement preventing device such as a wave washer or a retaining ring to an end of a rotating shaft or to provide a step by slightly displacing a rotor position from a stator position. An object of the present invention is to provide a scroll compressor in which the rotation axis does not move without taking measures such as the above.

[0012]

The inventors of the present invention have conducted intensive studies on such a problem, and as a result, shrink-fitting of the rotor to the rotating shaft is performed after the rotating shaft is assembled to the support frame in advance. The inventors have found that the problem can be solved by making the diameter smaller than D2, and have accomplished the present invention.

That is, the invention according to claim 1 of the present invention provides an electric element, a scroll compression element driven by the electric element in a closed container, and a supporter mounted in the closed container to support the scroll compression element. A support frame provided with a bearing portion for supporting a rotary shaft of the electric element at the center, the scroll compression element having a fixed scroll having a spiral wrap on a back surface, and the electric scroll for the fixed scroll. It has a spiral wrap that revolves by driving the element, and a boss hole is formed in the center of the back surface, which is eccentric to the axis of the rotating shaft and connected to a pin provided at an end of the rotating shaft. The orbiting scroll is engaged with each other to form a plurality of compression chambers, and the refrigerant gas sucked from outside the closed vessel is compressed in the compression chamber and discharged into the closed vessel. A scroll-type compressor configured to discharge the liquid to the outside of the closed container, wherein a diameter of the rotating shaft supported by the bearing portion is smaller than a diameter of the pin portion. Machine.

According to a second aspect of the present invention, there is provided the scroll type compressor according to the first aspect, further comprising a sub-support frame provided with a sub-bearing portion at the other end of the rotary shaft. A bearing is interposed between the rotating shafts, and a receiving portion of the bearing is provided on the auxiliary bearing portion.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG.
This will be described in detail with reference to the drawings shown in FIG. FIG. 1 is a sectional view showing the overall configuration of a scroll compressor according to the present invention.

The compressor shown in FIG. 1 is a scroll type compressor 1B, which has a closed container 31 formed in a cylindrical shape with both ends closed. An electric element 32 and a scroll compression element 33 driven by the electric element 32 are accommodated in the closed container 31.

The electric element 32 has a stator 34 fixed inside the closed container 31 and a rotor 35 located at the center of the stator 34.
A rotary shaft 36 oriented in the axial direction of the closed container 31 is penetratingly coupled to the center of the closed container 31. One end of the rotary shaft 36 is supported by the support frame 3 for supporting the scroll compression element 33.
7 is rotatably supported through the center portion. Here, the support frame 37 is fixedly connected to the inner wall surface of the closed container 31. The rotating shaft 36 is rotatably supported at one end on a halfway portion by a bearing portion 37A of the support frame 37. Supported on the side.

Further, a pin portion (crank portion) 41 whose center is provided eccentrically with respect to the axis of the rotating shaft 36 is formed at the end of the rotating shaft 36 penetrating the support frame 37. An orbiting scroll 42 is connected to the pin 41. The orbiting scroll 42 has a boss hole 43 connected to the center of one side surface of the disk-shaped end plate by inserting the pin portion 41 and a spiral wrap 44 formed on the other side surface of the end plate. .

A fixed scroll 45 is connected to the support frame 37. This fixed scroll 45
A spiral wrap 46 is formed on the wrap 44 of the orbiting scroll 42 to form a plurality of compression chambers 47 in a staggered state.

On the side wall surface of the fixed scroll 45, a refrigerant gas suction pipe 4 penetrated by the closed container 31 is provided.
8 are connected. At the center of the fixed scroll 45, a discharge port 49 for discharging the compressed refrigerant gas into the closed container 31 is provided.

The suction side of the scroll compression element 33 for the refrigerant gas sucked from the suction pipe 48, the back surface of the orbiting scroll 42 (the surface of the end plate with the boss hole 43) and the support frame 37 Are connected to each other at the peripheral edge of the end plate of the orbiting scroll 42, so that the pressure during this period is almost the same as the pressure on the refrigerant gas suction side and lower than the pressure in the closed vessel 31.

The other end of the rotating shaft 36 is provided with a differential pressure type
8 are provided. The oil supply section 38 is provided in the closed container 31.
A sub-support frame 52 having a sub-bearing portion 51 mounted inside and supporting one end of the rotating shaft 36 and having an oil introduction pipe 39 mounted thereon is provided. A bearing 53 is interposed between the auxiliary support frame 52 and the rotating shaft 36, and a receiving portion 55 of the bearing 53 is provided on the auxiliary bearing portion 51.

An oil passage 40 is formed in the rotary shaft 36 from one end to the other end. The portion of the rotary shaft 36 that is supported by the bearing 37A is closer to the electric element side. A small hole 56 communicating from the oil passage 40 to the sliding surface of the bearing 37A is provided. A helical groove 57 is formed on the surface of the rotating shaft 36 starting from the outlet of the small hole 56 and communicating with the small hole 56 toward the pin portion 41. A portion where the rotating shaft 36 is supported by the bearing 37A. Up to the middle. The lubricating oil from one end of the rotating shaft 36 gas seals the sliding surface between the boss hole 43 and the pin 41, and the lubricating oil passing through the small hole 56 is
To lubricate the sliding surface and gas seal the sliding surface on the pin portion 41 side from the small hole 56.

The hermetically sealed container 31 contains lubricating oil b to a predetermined level. The lubricating oil b is sucked up from the oil introduction pipe 39 of the oil supply section 38 by the above-mentioned differential pressure, and And is sent to each sliding portion including the bearing portion 37A through an oil passage 40 provided in the above, and is circulated and used.

Here, the diameter D1 of the rotary shaft 36 at a portion rotatably supported by the bearing portion 37A is smaller than the diameter D2 of the pin portion 41. D1 to D2
The scroll type compressor 1B of the present invention
Is operated, the force (in the direction indicated by the white arrow on the rotating shaft 36) directed in the direction of the oil supply unit 38 in parallel with the rotating shaft 36 is opposite to the case of the conventional scroll type compressor 1A shown in FIG. ) Acts. However, the rotation shaft 36
Is supported by a sub-bearing portion 51 of the oil supply portion 38 and a bearing 53 provided on the sub-bearing portion 51.
It does not move because it is supported by the receiving portion 55. Therefore, in the case of the scroll type compressor 1B of the present invention, the movement preventers 24 such as wave washers and retaining rings provided on the rotating shaft 6 of the conventional scroll type compressor 1A become unnecessary. It is not necessary to take a measure such as providing the step d by shifting the position slightly from the position of the stator 4.

When the operation of the scroll type compressor 1B of the present invention configured as described above is started, the refrigerant gas is supplied to the suction pipe 4B.
8 to the outer peripheral portion of the scroll compression element 33,
It is compressed by gradually moving to the center, and the closed container 3 is discharged from a discharge port 49 provided at the center of the fixed scroll 45.
1 and the lubricating oil entrained in this space is separated, and pulsation is reduced.

The discharged gas flows through a passage (not shown) provided in the fixed scroll 45 and the support frame 37 as shown by the white arrow, goes to the electric element 32 side, and receives the centrifugal force caused by the rotation of the rotor 35 and the stator 34 and the auxiliary The lubricating oil in the refrigerant gas is further separated by the baffle plate effect of the support frame 52 and the like, and the refrigerant gas from which the lubricating oil has been separated is discharged into the discharge pipe 50.
From the closed container 31. The separated lubricating oil flows as indicated by the black arrow, accumulates at the bottom of the closed vessel 31, and is circulated for use.

In the above description of the scroll type compressor of the present invention, the horizontal type scroll type compressor has been described. However, the scroll type compressor of the present invention is not limited to the horizontal type, but may be a vertical type. The present invention is also applicable to stationary scroll compressors and other types of scroll compressors.

[0029]

According to the scroll compressor of the present invention, a movement preventing device such as a wave washer or a retaining ring is attached to the end of the rotating shaft, or a step is provided by slightly shifting the position of the rotor from the position of the stator. Even if the above measures are not taken, the rotation shaft does not move, and stable operation can be performed for a long period of time.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an overall configuration of an embodiment of a scroll compressor according to the present invention.

FIG. 2 is a cross-sectional view showing the overall configuration of a conventional horizontal scroll compressor.

[Explanation of symbols]

 b Lubricating oil 1A, 1B Scroll compressor 31 Airtight container 32 Electric element 33 Scroll compression element 34 Stator 35 Rotor 36 Rotating shaft 37 Support frame 37A Bearing part 38 Oil supply part 39 Oil introduction pipe 40 Oil passage 41 Pin part 42 Oscillating scroll 43 Boss Hole 44, 46 Lapping 45 Fixed Scroll 47 Compression Chamber 48 Suction Pipe 49 Discharge Port 50 Discharge Pipe 51 Secondary Bearing 52 Secondary Supporting Frame 53 Bearing 55 Receiver 56 Small Hole 57 Groove

 ──────────────────────────────────────────────────の Continuing on the front page (72) Kazuya Sato, 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Kenzo Matsumoto 2-chome, Keihanhondori, Moriguchi-shi, Osaka No. 5-5 Sanyo Electric Co., Ltd. (72) Inventor Takehiro Nishikawa 2-5-5 Sanyo Electric Co., Ltd. (72) Inventor Takashi Sato Keihanhondori, Moriguchi-shi, Osaka 2-5-5 Sanyo Electric Co., Ltd.

Claims (2)

[Claims] 1. An electric element in a closed container, a scroll compression element driven by the electric element, a scroll compression element mounted in the closed container to support the scroll compression element, and a rotating shaft of the electric element in the center. A fixed scroll having a support frame provided with a bearing portion for supporting the shaft, wherein the scroll compression element has a spiral wrap on the back surface, and a spiral wrap revolved with respect to the fixed scroll by driving the electric element. Having a boss hole formed in a central portion of the back surface and eccentric with the axis of the rotating shaft and having a pin portion provided at an end of the rotating shaft connected to each other, meshing with an orbiting scroll. Forming multiple compression chambers,
A scroll compressor in which refrigerant gas sucked from outside the closed container is compressed in the compression chamber and discharged into the closed container, and then discharged outside the closed container. A scroll type compressor wherein the diameter of the rotating shaft supported is smaller than the diameter of the pin portion. 2. A sub-support frame having a sub-bearing portion at the other end of the rotary shaft, a bearing interposed between the sub-support frame and the rotary shaft, and The scroll-type compressor according to claim 1, wherein the scroll-type compressor is provided on the auxiliary bearing portion.