JPH0458096A - Manufacture of sealed compressor - Google Patents

Abstract

PURPOSE:To prevent the falling off of magnetic substance in heating by adhering a magnetic substance to the periphery of the iron core of a rotor and magnetizing the magnetic substance adhered on the iron core of the rotor. CONSTITUTION:The iron core 4 of a rotor is shrink-fitted to a crankshaft 1. After coating adhesive 6 on the periphery of the iron core shrink-fitted to the crankshaft 1, a magnetic substance 5 is adhered to the periphery of the iron core 4. Then by magnetizing the magnetic substance 5 adhered to the iron core 4, a sealed compressor provided with a desirable rotor can be obtained.

Description

[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention provides, for example, a method for manufacturing a hermetic compressor that transmits the rotational force of a rotary motor to a compression mechanism section via a crankshaft. Regarding.

(Prior art) For example, a hermetic compressor (hereinafter referred to as a compressor), which has a drive unit and a compression mechanism housed in a sealed case, uses a rotary motor in the drive unit. There is. In such a compressor, the drive unit includes a cylindrical stator fixed in a sealed case, and a permanent magnet disposed inside the stator and on the outer periphery of the rotor core. It consists of a stator and a rotor that is activated and rotated by electromagnetic force generated between the rotor and the stator.

Further, the compressor has the rotor externally fitted on a crankshaft connected to a compression mechanism section. The hermetic compressor rotates a crankshaft together with a rotor, and transmits the driving force of a drive section to a compression mechanism, such as a rotary type or a scroll type, via the crankshaft.

Furthermore, ferrite magnets are often used as permanent magnets provided in the rotor. This ferrite magnet has the properties of being hard and brittle, making it difficult to process. Therefore, the ferrite magnet is fixed to the rotor core via an adhesive applied to the outer peripheral surface of the rotor core.

In addition, methods for fitting the thus formed rotor to the crankshaft include a method of press-fitting the crankshaft into the rotor, a method of shrink-fitting the crankshaft and the rotor, and a method of fitting the rotor with a key formed on the rotor. There is a method of inserting it into the groove formed on the crankshaft.

Among these methods, in the method of shrink fitting the crankshaft and rotor, it is conceivable that the adhesive between the rotor core and the ferrite magnets will melt during heating and the ferrite magnets will fall off.

Furthermore, the method of fitting the rotor to the crankshaft by inserting the key into the keyway requires machining the key and the keyway on the crankshaft and rotor, respectively, and is expensive.

For this reason, as a method for fitting the rotor to the crankshaft, a method is generally adopted in which the crankshaft 1 is press-fitted into the rotor 2, as shown in FIGS. 5 and 6. In this method, the crankshaft 1 combined with the compression mechanism section 3 has one axial end thereof connected to the rotor core 4.
It is coaxially press-fitted into the A rotor 2 in which a magnetic body 5 such as a ferrite magnet is fixed to a rotor core 4 via an adhesive 6 is fitted onto the crankshaft 1 .

Further, as shown in FIGS. 7 and 8, the magnetic body 5 is magnetized and magnetized before or after the crankshaft is press-fitted into the rotor 2.

(Problems to be Solved by the Invention) By the way, the method of press-fitting the crankshaft into the rotor has the following drawbacks. That is, the crankshaft 1 may be deformed due to the press force applied to the crankshaft 1 when the crankshaft 1 is press-fitted into the rotor 2.

The purpose of the present invention is to prevent magnetic substances from falling off during heating and excessive force from being applied to the crankshaft, and to prevent the need to provide keys and keyways on the crankshaft and rotor. The purpose of the present invention is to provide a method for manufacturing a high-performance, high-quality, and inexpensive hermetic compressor without any problems.

(Means and operations for solving the problems) In order to achieve the above object, the present invention has a drive section and a compression mechanism section to which the drive force of the drive section is transmitted via a crankshaft, and the drive section In a method for manufacturing a hermetic compressor having a rotor comprising a rotor core fitted onto a crankshaft and a magnetic material fixed to the outer peripheral surface of the rotor core and magnetized, the rotor core A first step of shrink-fitting the rotor core and the crankshaft, a second step of applying an adhesive to the outer circumferential surface of the rotor core that is shrink-fitted to the crankshaft, and a second step of applying a magnetic material to the outer circumferential surface of the rotor core. and a fourth step of magnetizing the magnetic material bonded to the rotor core.

By doing this, the present invention prevents the magnetic material from falling off during heating and excessive force from being applied to the crankshaft, and also eliminates the need to provide a key and keyway on the crankshaft and rotor. High performance and
The goal is to make it possible to manufacture high-quality, inexpensive hermetic compressors.

(Example) Hereinafter, an example of the present invention will be described based on FIGS. 1 to 4. Components that are the same as those described in the prior art section are given the same numerals and their explanations will be omitted.

1 to 4 show one embodiment of the present invention.

1 in Figures 1 to 3 is a crankshaft, 2
3 is a rotor constituting a drive unit such as a rotary motor, and 3 is a compression mechanism unit such as a rotary type or a scroll type. Among these, the crankshaft 1 is formed into a cylindrical shape, and one end in the axial direction is inserted into the compression mechanism section 3 so that the crank section (not shown) is located in the compression mechanism section 3.

First, a cylindrical rotor core 4 made of, for example, a plurality of overlapping metal plates is heated from the outside with a burner or a high-frequency heater, and the other axial end of the crankshaft 1 is heated as shown in FIG. 1 and is shrink-fitted onto the crankshaft 1.

Furthermore, the rotor core 4 is cooled after being shrink-fitted to the crankshaft 1. After the temperature of the rotor core 4 has decreased sufficiently, an adhesive 6 is applied to its outer circumferential surface.

Here, the temperature of the rotor core 4 when applying the adhesive 6 is set to a value that does not melt or decompose the adhesive 6.

Furthermore, as shown in FIGS. 2 and 3, four magnetic bodies 5 made of, for example, ferrite magnets are fixed to the rotor core 4 via an adhesive 6.

The magnetic bodies 5 are arranged on the outer circumferential surface of the rotor core 4 at approximately equal intervals along the circumferential direction, and the rotor 2 integrated with the crankshaft 1 and the compression mechanism section 3 is formed.

Thereafter, the magnetic body 5 is magnetized to have a predetermined magnetic force necessary for the rotor 2.

The rotor assembly formed in this way is the fourth rotor assembly.
As shown in the figure, it is sent to the next process and assembled into a sealed case (not shown).

That is, according to the method described above, since the crankshaft 1 and rotor 2 are fitted externally by shrink fitting,
Both parts 1.2 can be joined without machining keys and keyways on each part 1.2.

In addition, after the crankshaft 1 and rotor 2 are shrink-fitted, the adhesive 6 is applied to the rotor core 4 and the magnetic material 5 is fixed, so the adhesive It is possible to prevent the magnetic material 5 from falling off due to the dissolution of the agent 6.

And from these things, the quality and performance of the hermetic compressor can be improved, and the cost of the hermetic compressor can be reduced.

[Effects of the Invention] As explained above, the present invention includes a drive section and a compression mechanism section to which the driving force of the drive section is transmitted via the crankshaft. In a method for manufacturing a hermetic compressor having a rotor comprising a rotor core and a magnetic material fixed to the outer peripheral surface of the rotor core and magnetized, the rotor core and the crankshaft are shrink-fitted. The first step is to apply adhesive to the outer peripheral surface of the rotor core that is shrink-fitted to the crankshaft.
The third step is to adhere the magnetic material to the outer peripheral surface of the rotor core.
and a fourth step of magnetizing the magnetic material bonded to the rotor core.

Therefore, the present invention can prevent the magnetic material from falling off during heating and excessive force from being applied to the crankshaft, and there is no need to provide a key or keyway on the crankshaft or rotor. The effect is that it is possible to manufacture a hermetic compressor with high performance, high quality, and low cost.

[Brief explanation of drawings]

Figures 1 to 4 show one embodiment of the present invention.
The figure is an explanatory diagram showing the state in which the crankshaft is inserted into the rotor core, Figure 2 is an explanatory diagram showing the state in which the magnetic material is fixed to the rotor core, and Figure 3 is the rotor fitted onto the crankshaft. The same explanatory diagram shows the state in which the magnetic material is fixed to the iron core, FIG. 4 is a block diagram showing each step in order, and FIGS.
Fig. 8 shows a conventional example, Fig. 5 is an explanatory diagram showing the state in which the crankshaft is inserted into the rotor, Fig. 6 is a plan view of the crankshaft and rotor, and Figs. 7 and 8 are It is a block diagram showing each process in order. 1... Crankshaft, 2... Rotor, 3...
Compression mechanism section, 4... Rotor core, 5... Magnetic material, 6
···glue. Applicant's Representative Patent Attorney Takehiko Suzue Figure 2 Figure 3 Figure

Claims (1)

[Claims] It has a drive part and a compression mechanism part to which the driving force of the drive part is transmitted via the crankshaft, and the drive part includes a rotor core fitted onto the crankshaft and an outer circumferential surface of the rotor core. In a method of manufacturing a hermetic compressor having a rotor made of a magnetic material fixed to and magnetized, a first step of shrink-fitting the rotor core and a crankshaft; a second step of applying an adhesive to the outer circumferential surface of the rotor core that has been shrink-fitted; a third step of bonding a magnetic material to the outer circumferential surface of the rotor core; A method for manufacturing a hermetic compressor, comprising a fourth step of magnetizing a magnetic material.