JPH03151590A - Rotary compressor - Google Patents

Abstract

PURPOSE:To enhance rigidity of a sealed case and reduce vibration and noise by interposing a spacer between the sealed case and the cut portion of a stator core in an electric motor portion stored in the case, the spacer abutting against both the case and the cut portion. CONSTITUTION:A rotary compressor 1 has an electric motor portion 3 stored in the upper portion of a sealed case 2, and a rotary compressor portion 4 in the lower portion. The electric motor portion 3 comprises a stator core 6 around which a coil 5 is wound, and a rotor 8 fitted over a rotary shaft 7 and rotating within the stator core 6. A space portion is formed between the sealed case 2 and the cut portion 17 of the stator core 6. A spacer 18 is interposed in the space portion in such a manner that the spacer 18 abuts against both the sealed case 2 and the cut portion 17. Rigidity of the sealed case 2 corresponding to the space portion is thus enhanced and vibration or noise of the stator core 6 is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a rotary compressor used in refrigerators, showcases, etc.

(b) Conventional technology Conventionally, this type of rotary compressor
As disclosed in the publication, an electric motor part and a rotary compressor part are housed in a cylindrical sealed case, and
The stator core of the electric motor section is tightly attached to the sealed case by shrink fitting or shrink fitting, and a cut portion is formed on the outer periphery of the core. Normally, the planar shape of the stator core is not completely circular due to material removal during punching of the electromagnetic steel sheet, but a straight part is provided in a part, and a cut part is formed on the outer peripheral surface of the stator core6.
For the second reason, when the stator core is press-fitted into the sealed case, a space is created in a part where the stator core and the sealed case do not come into contact with force. This space is used as a path for causing oil in the discharged gas separated in the space above the motor section to fall into an oil reservoir below, or for discharging the discharged gas.

(c) Problems to be Solved by the Invention However, according to the above configuration, a space is formed between the sealed case and the stator core by the notch of the stator core, so the rigidity of the sealed case in this space is inevitably reduced. There was a problem in that the compressor became weak and resonated with the operating vibrations of the compressor, producing noise.

The present invention has been made in view of the above, and aims to increase the rigidity of the sealed case in the space between the sealed case and the stator core while maintaining the function of the space between the sealed case and the stator core as an oil passage. The purpose is to reduce noise.

(d) Means for Solving the Problems The present invention has an electric motor section and a rotary compressor section housed in a cylindrical sealed case, and a stator core of the electric motor section is press-fitted or shrink-fitted into the sealed case. and a cut part is formed on the outer periphery of the core, and a spacer is interposed in the space between the cut part and the sealed case, and the spacer contacts both the cant part and the sealed case. .

(E) With the above-described configuration, the rotary compressor of the present invention not only increases the rigidity of the sealed case corresponding to the space by the spacer, but also suppresses vibrations of the stator core itself. The noise emitted from the sealed case can be reduced. In addition, since the spacer only needs to be formed in a part of the sealed case facing the cant part instead of the entire area, the cross-sectional area of the space can be secured, and the space can be used as a passage for oil or refrigerant as before. It can be made to work. As a result, even if straight sections are formed in the electromagnetic steel sheets constituting the stator core to promote material reduction, there is no need to consider the problem of noise emitted from the space so much, and the degree of freedom in compressor design can be improved.

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

Reference numeral 1 denotes a rotary compressor in which a motor part 3 is housed in the upper part of a cylindrical sealed case 2, and a rotary compressor part 4 is housed in the lower part.

The sealed case 2 includes a cylindrical body 2a made of a rolled metal plate, and an upper fi2 for closing the opening of the cylindrical body.
+ and lower 1i2c. The electric motor section 3 includes a stator core 6 having a substantially circular cross section, which has a coil 5 wound around eight not-shown slots and is shrink-fitted into the sealed case 2;
The rotor 8 is fitted onto the rotating shaft 7 and rotates within the stator core 6. The rotary compressor section 4 integrally includes a cylinder 9 welded into the sealed case 2, a compression chamber 10 formed inside by closing the bore of the cylinder 9, and bearing sections 11 and 12 for the rotating shaft 7. An upper frame 13, a lower frame 14, a roller 20 that rotates within the compression chamber 10, and a vane 15 that divides the compression chamber 10 into a high pressure side and a low pressure side.
It consists of Reference numeral 16 denotes a space formed between the closed case 2 and the force center portion 17 (plane portion) of the stator core 6. Reference numeral 18 denotes a spacer made of gold IX'l and having a convex cross section, which is interposed in the space 16 between the force section 17 and the sealed case 2 so as to come into contact with both the cut part 17 and the sealed case 2. . This spacer 18 is press-fitted into a groove 19 previously formed in the cut portion 17 of the stator core 6 before shrink-fitting the cylindrical body 2a of the sealed case 2 with the hestita core alloy, and when the stator core 6 is shrink-fitted into the sealed case 2, The dimensions are controlled so that it comes into contact with the

In the rotary pressure wIi machine configured as shown in 2, a spacer 18 that contacts both the sealed case 2 and the stator core 6 is interposed in the space 16 between the cup portion 17 of the stator core 6 and the sealed case 2. Therefore, the spacer 18 can not only reduce the rigidity of the sealed case 2 corresponding to the space 16 but also suppress the vibration of the stator core 6 itself. It can reduce the noise emitted from. In addition, since the desired vibration damping effect can be obtained by making the spacer 18 contact only a portion of the sealed case 2 facing the cut portion 17 instead of the entire area, a sufficient cross-sectional area of the space portion 16 should be ensured. This allows the space 16 to function as a passage for oil and refrigerant as before. As a result, even if it is possible to reduce the amount of material by cutting straight parts and forming force/strain parts in the core when punching the electromagnetic steel sheet that constitutes the stator core 6, it is necessary to consider the problem of noise emitted from the space 16 as much as possible. Therefore, the degree of freedom in designing the compressor including the electric motor section 3 can be improved. Furthermore, since the spacer 18 is a separate part, by preparing spacers with different thicknesses (distance between the sealed case and the cut part), it is possible to use compressors with different capacities with different sizes of the sealed case 2 and stator core 6. can be easily dealt with.

(G) Effects of the Invention As described above, according to the present invention, the space between the sealed case and the stator core functions as an oil passage, and the cut portion of the stator core maintains the material removal effect. At the same time, it is possible to increase the rigidity of the sealed case in such a space and to suppress vibrations of the stator core itself.
Compressor noise can be reduced. Furthermore, since it is no longer necessary to consider the noise emitted from the space so much f'', the degree of freedom in designing the rE including the electric motor and the compressor can be improved.

Furthermore, since the spacer is a separate component, compressors with different capacities can be easily treated with N by simply preparing a spacer with a certain thickness.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view of a rotary compressor showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along section AA in FIG. 1. 2...11 case, 6...stator core, 16...
- Space part, 17... Force/I to part, 18... Spacer.

Claims (1)

[Claims] (1) An electric motor section and a rotary compressor section are housed in a cylindrical sealed case, and the stator core of the electric motor section is tightly fitted to the sealed case by press fitting or shrink fitting, and a cut is made on the outer periphery of the core. 1. A rotary compressor, characterized in that a spacer is interposed in the space between the cut part and the sealed case, the spacer being in contact with both the cut part and the sealed case.