JPS6218940A - Closed-type rotary compressor - Google Patents

Abstract

PURPOSE:To minimize the lowering of characteristics of an electric motor caused by notchings or gas holes provided therein by getting the polar distances of main windings to conform to the positions of the notchings on the outside circumference of a stator or those of the gas passage holes provided on the stator. CONSTITUTION:Inside the stator grooves 15 of a stator 2, main windings 16 and auxiliary windings 17 are enclosed. On the other hand, notchings 12 are provided on the outside circumference of the stator 2 so as to secure the passage of gas. This notching 12 is provided to the position where the magnetomotive force is at the minimum, i.e. to the polar position B by the main windings 16. thus a closed-type compressor of high efficiency can be obtained.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a hermetic rotary compressor, and particularly to the relative position of a notch or gas hole provided in a stator of a single-phase induction motor and a winding. It's about relationships.

[Conventional technology]

Fig. S and Fig. 6 show a conventional hermetic rotary compressor described in Japanese Utility Model Application No. 59-175678.
A cylinder 4 and a piston 5 constituting a compression element are housed therein, and both elements are connected by a crankshaft 6. 7.8 is a bearing that supports the crankshaft 6; 9 is a discharge valve provided on the bearing 7 to discharge compressed high-pressure gas; and IO is a companion discharge muffler provided to cover the discharge valve 9. Further, 11 is an air gap between the stator 2 and the rotor 3, 12 is a notch provided at multiple locations on the outer circumferential side of the stator 2 over the entire length in the axial direction, and 13 is a gap between the notch 12 and the sealed container l. A space 14 formed in is a discharge pipe attached to the closed container IK.

Next, the operation of the above device will be explained. Mechanical energy generated by the electric element consisting of the stator 2 and the rotor 3 is transmitted by the crankshaft 6 to the piston 5 of the compression element, which compresses the refrigerant gas sucked into the cylinder 4. This compressed gas is discharged from the discharge valve 9,
After passing through the air gap 11 or space 13 via the discharge muff 10 as shown by the arrow in FIG. 5, it is discharged from the discharge pipe 14.

[Problem that the invention seeks to solve]

However, in the conventional device described above, since the stator 2 is tightly housed in the airtight container 1, a notch 12 is formed on the outer circumference of the stator 2 to ensure a passage for the gas discharged from the discharge valve 9. Therefore, there is a problem in that the efficiency, power factor, and other characteristics of the motor are lower than in a case without the shank 12, and the characteristics of the compressor are also deteriorated.

The present invention was made in order to eliminate the above-mentioned problems, and it improves the efficiency and power factor of the electric motor by providing notches or holes in the stator to ensure gas passages in the electric element part. The objective is to obtain a highly efficient hermetic rotary compressor by minimizing the deterioration of

Means for Solving Problem C] The hermetic rotary compressor according to the present invention fixes the pole gap of the main winding among the main winding and the auxiliary winding wound around the stator of the electric element. The position is made to match the position of the notch on the outer periphery of the child or the gas passage hole provided in the stator.

[Effect]

In the hermetic rotary compressor according to the present invention, the positional relationship between the main winding wound around the stator and the stator notches or gas holes is adjusted so that the stator magnetic path is reduced by the notches or gas holes. Since the relative arrangement is such that the influence on the accompanying deterioration of motor characteristics is minimized, highly efficient compressor characteristics can be obtained.

〔Example〕

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

FIG. 1 shows a stator 2 of an electric element (single-phase induction motor), 15 is a stator groove, and 16 and 17 are a main winding and an auxiliary winding housed in the stator groove 15, respectively. Further, FIG. 2 is a developed view showing the arrangement of the main winding 16, and numbers 1 to 24 are the numbers of the stator grooves 15 added for convenience of explanation.
This corresponds to Figure 1. As is well known, in a single-phase induction motor, the main winding 16 and the auxiliary winding 17 are arranged with a spatial phase difference (90 degrees in Figure 1), and currents with different phases are applied to each. As a result, a rotating magnetic field is generated,
Operates as an electric motor.

By the way, in the case of the arrangement of the main winding 16 as shown in FIG. 2, the magnetomotive force distribution waveform becomes a stepped waveform as shown in FIG. The height of each step, that is, the magnitude of the magnetomotive force, increases or decreases depending on the number of turns accommodated in each stator groove 15, and the stepped magnetomotive force waveform changes accordingly. Furthermore, as the current flowing through the windings changes in alternating current, the magnetomotive waveform also changes instantaneously, as shown by the broken line in the figure. However, at each instant, the position showing the maximum value and the position showing the minimum value remain unchanged, and it is clear that point A in FIG. 1 always shows the maximum value and point B always shows the minimum value. Similarly, auxiliary winding 17
Considering the magnetomotive force caused by the main winding 16, point B in FIG. 1 always shows the maximum value and point A always shows the minimum value, contrary to the case of the main winding 16. However, in normal operating conditions, the magnetomotive force of the main winding 16 is usually larger than the magnetomotive force of the auxiliary winding 17. If the notch 12 is required in the main winding 16, the notch 12 can be provided at the position where the magnetomotive force by the main winding 16 is minimum, that is, at the position between the poles of the main winding 16 corresponding to point B in FIG. Furthermore, a magnetic path can be effectively ensured, and deterioration in the characteristics of the electric motor due to the reduction of the magnetic path by providing the cutouts 12 in the stator 2 can be minimized.

In the above embodiment, notches 12 were provided on the outer periphery of the stator 2 as gas passages, but as shown in FIG. good. In this case as well, the gas hole 18 is of course provided between the poles of the main winding 16, and the same effect as in the previous embodiment is obtained.

In each of the above embodiments, the case where the spatial arrangement angle of the main winding 16 and the auxiliary winding 17 is shifted by 90'' is referred to as symmetrical winding, but the present invention also applies to other asymmetric windings. Has a similar effect.

〔Effect of the invention〕

As described above, according to the present invention, when a notch or gas hole is provided as a gas passage in the stator of an electric element, the position of the notch or gas hole is set between the poles of the main winding where the supermagnetic force is minimum. Since the heat is aligned with the position, deterioration in motor characteristics due to the provision of notches or gas holes can be minimized, and a compressor with higher efficiency than before can be obtained.

[Brief explanation of the drawing]

1 to 3 are a sectional view of a stator of a hermetic rotary compressor according to a first embodiment of the present invention, a developed view showing the main winding arrangement, and a magnetomotive force distribution waveform due to the main winding, respectively. Schematic diagram showing,
FIG. 4 is a cross-sectional view of a stator of a hermetic rotary compressor according to a second embodiment of the present invention, and FIGS. 5 and 6 are a vertical front view and a vertical cross-section of a conventional hermetic rotary compressor, respectively. FIG. 1... Airtight container, 2... Stator, 3... Rotor,
4... Cylinder, 5... Piston, 6... Crankshaft, 12... Notch, 16... Main winding, 18...
・Gas hole. Note that the same reference numerals in the drawings indicate the same parts or parts corresponding to i.

Claims (1)

[Claims] (1) In a sealed rotary compressor in which an electric element and a compression element are connected and housed in a closed container, a gas passage notch or gas hole is provided in the stator of the electric element along the entire axial length. A hermetic rotary compressor characterized in that the position matches the position between poles of a main winding wound around a stator.