JPH02227566A - Sealed type motor-driven compressor - Google Patents

Abstract

PURPOSE:To prevent the coil end of a stator from damage by accomplishing a compressor in such an arrangement that non-flat parts such as heat radiation fins, balancer, etc. are furnished on an end ring, facing a liquid sump for lubricant etc., of the motor part to be located in the lower part of an enclosure case, and by dislocating the non-flat parts in the axial direction. CONSTITUTION:In an enclosed type motor-driven compressor as per the present invention, a compressor part 2 of rotary type etc. is located in the upper part in an enclosure case 1 while a motor part 3 in the lower part. In this motor part 3, a coil end 8 is furnished on a stator 7 core 7a at each of its two ends in the axial direction while an end ring 9 mounted on a rotor 6 core 6a at each of its ends in the axial direction, and further non-flat parts 12 such as a balancer 10, heat radiation fins 11, etc. are installed at the bottom of this lower end ring 9. Therein the non-flat parts 12 shall be in such an arrangement that the bottom of the end ring 9 is extended downward by an amount H from the bottom of the coil end 8 to preclude the flow of mixture liquid generated from the non-flat parts 12 from running against the inner surface of coil end 8 directly. Thus damage of coil end 8 and generation of noise are prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Application Field) The present invention relates to a hermetic electric compressor in which the arrangement structure of a stator and a rotor constituting an electric part is improved.

(Prior art) A hermetic electric compressor, which is mainly used in the refrigeration cycle of an air conditioner, has a compression section in the upper part of the hermetic case.
It is known that a motor-driven part for driving the compression part is arranged in the lower part. The electric part is composed of a stator having coil ends at both ends as shown in FIG. 5, and a rotor having end rings at both ends, and the lower end ring 9 has a rotor as shown in FIG. A heat radiation fin 11 for cooling the six parts and a balancer 10 for balancing the rotation are provided. In addition, a liquid reservoir 13 is formed at the bottom of the sealed case to store a mixture of lubricating oil and refrigerant, and the radiation fins 11 and the like are immersed in the mixed liquid when the liquid level in the liquid reservoir 13 rises. Become.

(Problem to be Solved by the Invention) However, in the closed type electric pressure m machine, the non-flat portion 12 consisting of the radiation fins 11 and the balancer 10 formed unevenly on the end ring 9 is located at the lower coil end of the stator 7. 8, the turbulent flow of the mixed liquid generated from this uneven portion 12 as the rotor 6 rotates directly onto the inner surface of the lower coil end 8, as shown by arrow B. Not only is there a risk of damaging the coil end 8, but there is also the problem of generating noise.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a hermetic electric compressor that can solve the above problems and prevent damage to coil ends and generation of noise.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention arranges a motorized part consisting of a stator having a coil end and a rotor having an end ring in a lower part inside a sealed case. In a hermetic electric compressor in which an end ring facing a liquid reservoir of lubricating oil or the like is provided with a non-flat part such as a radiation fin or a balancer, the non-flat part is shifted in the axial direction so that it does not face the coil end of the stator. It was established by

(Function) Since the non-flat portion is axially offset so that it does not face the coil end of the stator, the flow of the mixed liquid generated from this non-flat portion as the rotor rotates is directed toward the coil end of the stator. This prevents damage to the coil end and generation of noise caused by the flow of the mixed liquid directly hitting the inner surface of the coil end.

(Example) Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

In FIG. 1 showing the first embodiment, 1 is a sealed case of a hermetic electric compressor, and inside this sealed case 1, a compression section 2 such as a rotary type is installed in the upper part, and the compression part 2 is driven in the lower part. A motorized section 3 is provided for each. The electric part 3 includes a rotor 6 attached to a crankshaft 5 vertically supported via a bearing 4 in a sealed case 1, and a rotor 6.
The stator 7 is fixed in a sealed case 1 so as to surround the stator 7.

Coil ends 8 are disposed at both axial ends of the iron core 7a of the stator 7, and end rings 9 are attached to both axial ends of the iron core 6a of the rotor 6. A balancer 10 is protruded from the lower end of the lower end ring 9 in a predetermined range in the circumferential direction, and radiation fins 11 are protruded from the remaining range at appropriate intervals. This is a non-flat portion 12.

In particular, the non-flat portion 12 extends the lower end of the iron core 6a of the rotor 6 lower than the lower end of the iron core 7a of the stator 7,
By extending the lower end portion of the lower end ring 9 downward by an amount of T than the lower end portion of the lower coil end 8, the lower end ring 9 is positioned shifted downward in the axial direction so as not to face the lower coil end 8.

A liquid reservoir 13 for storing a mixture of lubricating oil and refrigerant is formed in the lower part of the sealed case 1, and the uneven part 12 is formed in the liquid reservoir 1.
When the liquid level in 3 rises, it will be immersed in the mixed liquid.

According to this configuration, since the non-flat portion 12 is disposed axially shifted downward so that it does not face the coil end 8 of the stator 7, the non-flat portion 12 generates noise as the rotor 6 rotates. The flow of the mixed liquid flows outward in the radial direction as shown by arrow A and does not directly hit the inner surface of the coil end 8. Therefore, the flow of the mixed liquid directly hits the inner surface of the coil end 8. Damage to the coil end 8 and generation of noise are prevented. In addition, the heat dissipation fins 11 extend from the coil end 8 and have good contact with the mixed liquid, improving the cooling effect of the motorized part 3 and the surrounding bearings 4, etc., improving the efficiency and reliability of the compressor. You can improve your sexual performance.

FIG. 3 shows a second embodiment. In this embodiment, the lower end of the iron core 6a of the rotor 6 is located at almost the same position as the lower end of the iron core 7a of the stator 7, and instead of By forming the non-flat portion 12 to be large in height, the non-flat portion 12 is disposed at a position shifted downward in the axial direction from the lower end portion of the lower coil end 8 .

FIG. 4 shows a third embodiment. In this embodiment, the lower end of the iron core 7a of the stator 7 is formed to extend downward longer than the lower end of the iron core 6a of the rotor 6, so that the The lower end portion of the flat portion 12 is positioned to be shifted upward by G than the lower end portion of the iron core 7a of the stator 7. According to this configuration, as the rotor 6 rotates, the non-flat portion 1
The flow of the mixed liquid generated from 2 hits the inner surface of the iron core 7a of the stator 7 as shown by arrow A, and does not directly hit the inner surface of the coil end 8. Therefore, the flow of the mixed liquid hits the inner surface of the coil end 8. Damage to the coil end 8 and generation of noise caused by direct contact with the coil end 8 are prevented.

[Effects of the Invention] In short, according to the present invention, the flow of the mixed liquid generated from the non-flat portion as the rotor rotates does not directly hit the inner surface of the coil end, so that the flow of the mixed liquid is directed against the inner surface of the coil end. Damage to the coil end and generation of noise caused by direct contact with the coil end can be prevented.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing a first embodiment of the hermetic electric compressor of the present invention, Fig. 2 is an enlarged perspective view of the main part of Fig. 1, and Fig. 3 is a second embodiment of the hermetic electric compressor. FIG. 4 is a perspective view of a main part showing a third embodiment of a hermetic electric compressor, and FIG. 5 is a conventional one. FIG. 6 is an enlarged perspective view of the main part of FIG. 5. In the figure, 1 is a closed case, 3 is an electric part, 6 is a rotor, 7 is a stator, 8 is a coil end, 9 is an end ring, 10
1 is a balancer, 11 is a radiation fin, and 12 is a non-flat portion.

Claims (1)

[Claims] 1. A motorized part consisting of a stator with a coil end and a rotor with an end ring is placed in the lower part of the sealed case, and non-flat parts such as radiation fins and a balancer are provided on the end ring facing the reservoir of lubricating oil etc. What is claimed is: 1. A hermetic electric compressor, characterized in that said non-flat portion is offset in the axial direction so as not to face a coil end of said stator.