JP2001346348A - Rotor of compressor and method of assembling compressor parts - Google Patents

Abstract

(57) [Summary] [PROBLEMS] Even when heating is performed to shrink-fit and fix a rotor of a brushless motor to a shaft, heat is deprived by a large balance weight of a balance weight disposed on an end plate.
The inner diameter shrinks, making it difficult to secure a gap required for insertion, and significantly reduces workability. SOLUTION: By increasing the inner diameter of the shaft insertion portion of the rotor on the side where the metal block is disposed, even if heat is taken by the metal block and the inner diameter of the shaft insertion portion shrinks, it is necessary for insertion. Since a proper gap is ensured, assembling workability is ensured.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotor for a brushless motor used in a compressor or the like and a method for assembling compressor parts using the same.

[0002]

2. Description of the Related Art As shown in FIG. 3, a scroll compressor has a structure in which a brushless motor 3 is composed of a stator 4 fixed to a sealed container 1 and a rotor 5 shrink-fitted and fixed to a shaft 6. The motor 6 drives the shaft 6 and the compression mechanism 2 to compress the gas.

Conventionally, the rotor 5 of the brushless electric motor 3 is formed by press-forming an iron plate (silicon steel plate or the like) having a thickness of about 0.1 to 0.3 mm to insert a magnet (not shown) and a rivet. 11 and a shaft hole (not shown) are formed, a plurality of the holes are laminated, an end plate 12 is formed, and the end plate 12 is formed into a cylindrical shape with rivets 11 and fixed.

The end plate 12 of the rotor 5 on the side close to the compression mechanism 2 balances the unbalance between the eccentric portion 6a of the shaft 6 and the swirling spiral blade member 7 when the compression mechanism 2 is driven. For this purpose, a balance weight 13 made of a material having a higher thermal conductivity than the iron plate, such as brass, is fixed by rivets 11 together with the iron plate and the end plate 12.

At the time of assembly, the shaft 6 is
The rotor 5 is inserted from the side where the balance weight 13 is attached and shrink-fitted and fixed, but the heating of the rotor 5 is performed by heating the entire rotor 5 from the surroundings using an oven or the like. .

Since the balance weight 13 is usually preferably made as small as possible to reduce the size of the compressor, brass or the like having a high specific gravity is often used.

[0007]

However, since the heat conductivity of brass is about twice as large as the heat conductivity of the material of the iron plate constituting the rotor, heat is easily transmitted, and the shaft 6
When the rotor 5 is shrink-fitted into the rotor, even if the rotor 5 is heated, the heat is deprived by the metal block, and as a result, the heated inner diameter increases until the step of inserting the rotor 5 into the shaft 6. However, there has been a problem that the workability of the assembly is significantly impaired.

Further, as described above, the rotor 5 is connected to the shaft 6.
The heating method of heating the whole when shrink-fitting into a large amount requires a large amount of energy, and has a problem that the manufacturing cost increases.

An object of the present invention is to solve such a conventional problem, and an object of the present invention is to provide a rotor capable of minimizing internal diameter shrinkage during shrink fitting.

It is another object of the present invention to provide a method for assembling compressor components at low cost by heating and shrink-fitting the rotor with less energy.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to solve the above-mentioned problems, the present invention provides a shaft for driving a compression mechanism and a laminated iron plate which is caulked and fixed by rivets, and is further manufactured on the end face with a material having higher thermal conductivity than the iron plate Metal block is arranged,
In the rotor that is shrink-fitted and fixed to the shaft, the inside diameter of the insertion portion of the shaft hole on the side where the metal block is provided is enlarged as compared with the fixed portion.

Further, in a rotor in which a metal block made of a material having a higher thermal conductivity than an iron plate is disposed on an end face and which is fixed to the shaft by shrink fitting, only the inside of the shaft hole of the rotor is heated to rotate the rotor. Is fixed by shrink fitting.

[0013]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view of a rotor showing an embodiment of the present invention. As shown in the figure, the inner diameter of the shaft hole 14 of the rotor 5 is tapered toward the end plate 12 side on which the balance weight 13 is provided, in the insertion portion 14a as compared with the fixed portion 14b of the shaft. It has been gradually expanded with. Note that the length of the insertion portion 14a is appropriately determined according to the size of the balance weight, the heating time of the shrink fitting process, the size of the rotor, and the like.

As described above, the balance weight 13 is provided to balance the eccentric portion of the shaft 6 and the unbalance of the swirling spiral blade member when the compression mechanism is driven. Of the end faces, it is preferable to be disposed on the end face closer to the compression mechanism. That is, it is preferable that the balance weight 13 is provided on the side where the rotor 2 is inserted into the shaft 6.

The means for gradually increasing the inner diameter of the insertion portion 14a of the shaft hole 14 of the rotor 5 is obtained by laminating an iron plate to be laminated on which the inner diameter of the shaft hole 14 is gradually changed. It may be configured, or may be configured to be processed and deformed using a cutting device or a press device. Also,
In this embodiment, the inner diameter of the rotor 5 is gradually increased in a tapered shape, but the same effect can be obtained even if the same range is expanded with the same diameter. In this case, the rotor 5
Therefore, the manufacturing cost of the press die for punching the dies can be suppressed, so that the rotor can be configured at lower cost.

In the above configuration, when the rotor 5 is heated to shrink-fit the shaft 6, heat is first applied to the balance weight 13 fixed in contact with the iron plate to be heated. Deprived of balance weight 1
Even if the inner diameter of the shaft hole 14 of the rotor 5 on the side where the 3 is disposed becomes smaller, a gap necessary for inserting the rotor 2 into the shaft 6 can be secured because the original inner diameter is enlarged. Therefore, workability in the shrink fitting process of the rotor 5 is ensured, so that the compressor can be manufactured at a planned manufacturing cost.

In FIG. 1, the rotor 5 is inserted into the shaft hole 14 (the insertion portion 5) in order to shrink fit the shaft 6 and fix it.
a and only the fixed part 5b or the fixed part 5b) is induction-heated at a high frequency. In the insertion portion 5a of the rotor 5, the end plate 12 provided with the balance weight 13 is gradually increased.

In the above configuration, when only the inner diameter 5a is subjected to high-frequency induction heating by the coil 15 in order to shrink-fit the rotor 5 to the shaft 6, heat is taken away by the large balance weight 13 having high thermal conductivity. Even if the inner diameter 5a of the rotor 5 on the side where the large balance weight 13 is disposed becomes smaller, the original inner diameter is enlarged, so that a necessary gap can be secured when the rotor 5 is inserted into the shaft 6. Therefore,
Since the workability in the shrink-fitting process of the rotor 5 is ensured, the compressor can be manufactured at a planned manufacturing cost.

As a result, as shown in FIG. 2, the rotor 5 is shrink-fitted to the shaft 6 and fixed.

[0021]

As is clear from the above embodiment, according to the present invention, the inner diameter of the rotor on which the balance weight of the rotor is shrink-fitted and fixed to the shaft is enlarged, so that shrink-fitting is fixed. When the rotor is inserted into the shaft after heating it, even if the balance weight takes heat and the inner diameter of the rotor shrinks, the original inner diameter is increased. Can be secured. Accordingly, workability in the shrink fitting process is ensured, and the compressor can be manufactured at a planned manufacturing cost.

Further, since the inner diameter of the rotor on which the balance weight of the rotor is shrink-fitted and fixed to the shaft is enlarged, only the inner diameter of the rotor is expanded by high-frequency induction heating in order to fix the shrink-fit. Even if the balance weight takes heat when the rotor is later inserted into the shaft and the inner diameter of the rotor shrinks, the original inner diameter is increased, so that a necessary gap can be secured when inserting the rotor. Therefore, since only a necessary portion is heated, the manufacturing cost is low, and the workability in the shrink fitting process is ensured, so that the compressor can be manufactured at the planned manufacturing cost. Therefore, an inexpensive compressor can be provided.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram of a rotor and a shrink-fitting step showing an embodiment of the present invention.

FIG. 2 is a conceptual diagram of a completed rotor and shaft assembly showing an embodiment of the present invention.

FIG. 3 is a cross-sectional view of a conventional scroll compressor.

[Explanation of symbols]

 Reference Signs List 5 rotor 6 shaft 11 rivet 12 end plate 13 balance weight 14 shaft hole 14a insertion part 14b fixing part 15 coil

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Shuji Nakamura 1006 Kazuma Kadoma, Kazuma City, Osaka Prefecture F-term in Matsushita Electric Industrial Co., Ltd. (Reference) 3H003 AA05 AB03 AD01 CA01 CF05 5H002 AA07 AB07 AB08 AC06 AC10 5H615 AA01 BB01 BB07 BB14 PP02 PP07 SS19 SS24 TT05 5H622 CA10 PP03 PP09

Claims (2)

[Claims] 1. A laminated metal plate is fixed in a cylindrical shape, a magnet is inserted therein, and a shaft hole into which a shaft for driving a compression mechanism is inserted is provided, and at least one end surface of the cylindrical shape is provided. Is a rotor to which a metal block made of a material having a higher thermal conductivity than the metal plate is fixed via an end plate, and is a side of the shaft hole where the metal block is fixed. The inner diameter of the insertion portion on the side where the shaft is inserted is made larger than the inner diameter of the fixing portion for inserting and fixing the shaft. 2. A method for assembling compressor parts according to claim 1, wherein the shaft hole of the rotor of the compressor is heated by high-frequency induction and shrink-fitted to the shaft.