KR100575689B1 - Balance weight for electric motor - Google Patents

Abstract

The present invention relates to a balance weight of an electric motor, which is disposed on an opposite side of the eccentric portion with the rotary shaft of a rotor rotated about a rotary shaft having an eccentric portion at one side thereof, and the centrifugal force during rotation of the rotor. And a rotational balance weight that is rotated relative to the rotor to move the center of gravity along the radial direction of the rotor. Thereby, a balance weight of the motor is provided which can generate a relatively large rotational balance force without increasing its mass and its length along the rotational axis direction.

Description

Balance weight of electric motor {BALANCE WEIGHT FOR ELECTRIC MOTOR}

1 is a cross-sectional view of a scroll compressor for explaining the use state of the balance weight of the conventional electric motor,

2 is a perspective view of the upper balance weight area of FIG.

3 is a view showing a state of use of the balance weight of the motor according to the present invention,

4 is an enlarged view of the balance weight region of FIG. 3;

5 is a perspective view of the balance weight of FIG.

6 is a view for explaining the operation of the balance weight of FIG.

7 is a perspective view of a balance weight of an electric motor according to another embodiment of the present invention;

8 is a cross-sectional view taken along the line VII-VII of FIG. 7;

9 is a perspective view of a balance weight of an electric motor according to another embodiment of the present invention;

10 is a plan view of the balance weight of FIG.

11 is a view for explaining the operation of the balance weight of FIG.

Explanation of symbols on the main parts of the drawings

35: rotor 37: axis of rotation

53: fixed balance weight part 55: recessed part

56: shaft 58: rotation balance weight portion

59: rotating shaft

The present invention relates to a balance weight of an electric motor, and more particularly, to a balance weight of an electric motor capable of generating a relatively large rotational balance force without increasing its mass and its length along the rotation axis direction. will be.

1 is a cross-sectional view of a scroll compressor for explaining the use state of the balance weight of the conventional electric motor, Figure 2 is a perspective view of the upper balance weight region of FIG. As shown in FIG. 1, the scroll compressor includes a casing 11 that forms a sealed space therein, a compression unit 21 that is accommodated in the casing 11 to compress a refrigerant, and a casing 11. ) Is provided inside the motor and provided with a motor 31 for providing a driving force to the compression unit (21).

One side of the casing 11 is provided with a suction tube 13 and a discharge tube 15 to suck and discharge the refrigerant, and the compression unit 21 and the motor 31 to support the inside of the casing 11. The upper frame 17 and the lower frame 19 are installed to be spaced apart along the up and down directions.

The compression unit 21 includes an involute wrap 24 and a fixed scroll 23 fixed to the upper frame 17 and an involute wrap 26 to fix the scroll 23. It is provided with a pivoting scroll (25) which is pivotally coupled with respect to.

The electric motor 31 is comprised from the stator 33 fixedly arrange | positioned inside the casing 11, and the rotor 35 rotatably installed about the rotating shaft 37 in the stator 33 inside. .

An eccentric portion 38 formed on the upper end of the rotating shaft 37 so as to be rotated relative to the bottom of the rotating scroll 25 by being formed eccentrically from the center of rotation so that the rotating scroll 25 can pivot with respect to the fixed scroll 23. ) Is formed, and bearing portions 18 and 20 are rotatably supported on the upper frame 17 and the lower frame 19 to respectively support the upper region and the lower region of the rotation shaft 37.

On the other hand, the balance weight 41 is formed on the upper and lower ends of the rotor 35 along the axial direction of the rotating shaft 37 so as to reduce the rotational unbalance generated by the eccentric 38 during rotation. The balance weight 41 formed on the upper end of the rotor 35 extends in an arc shape at a predetermined height H1 along the rotation axis direction on the opposite side of the eccentric portion 38 with the rotation shaft 37 therebetween. An arc of a length that is protruded from the first balance weight portion 42a and the first balance weight portion 42a along a rotational axis direction at a predetermined height H2 and is reduced with respect to the first balance weight portion 42a along the circumferential direction. It consists of the 2nd balance weight part 42b extended so as to have a shape.

However, in the balance weight of the conventional electric motor, when the rotational unbalance generated by the eccentric portion 38 is increased, the heights H1 and H2 of the balance weight 41 along the rotation axis direction are increased to correspond. Therefore, the balance weight 41 formed on the peripheral part, for example, the upper end, has a problem that interference with the upper frame 17 is generated, making it difficult to cope.

It is therefore an object of the present invention to provide a balance weight of an electric motor capable of generating a relatively large rotational balance force without increasing its mass and its length along the rotational axis direction.

The object is, according to the present invention, disposed on the opposite side of the eccentric portion with the rotation axis of the rotor rotated about the rotation axis having an eccentric portion on one side, the rotor by the centrifugal force during the rotation of the rotor It is achieved by the balance weight of the motor, characterized in that it comprises a rotational balance weight that is rotated relative to the rotor to move the center of gravity along the radial direction of.

Here, further comprising a fixed balance weight portion rotatably formed on the rotor on the opposite side of the eccentric portion with the rotation axis therebetween, wherein the rotation balance weight portion is relatively rotatably coupled to the fixed balance weight portion. It is preferable.

The rotating balance weight portion is effectively rotatably coupled around the rotating shaft coupled to the fixed balance weight portion in the axial direction of the rotational shaft.

The rotating shaft is disposed perpendicular to the ground, and the rotating balance weight portion is preferably configured to be rotated by its own weight and stopped along the direction of gravity when the rotating shaft stops.

The rotating balance weight portion may be configured to be rotatably coupled around the rotating shaft coupled to the fixed balance weight portion in parallel with the rotating shaft.

Preferably, the rotational balance weight portion further includes a spring that applies an elastic force to the movable balance weight portion so as to rotate opposite to the direction of action of the centrifugal force.

It is effective to further include a stopper in contact with the rotation balance weight portion to limit the rotation range of the rotation balance weight portion.

The stopper is preferably coupled to move the position relative to the rotation balance weight portion to adjust the rotation range of the rotation balance weight portion.

It is effective that the stopper is screwed.

The stopper and the rotational balance weight portion preferably further includes a buffer member interposed in the mutual contact area.

Hereinafter, with reference to the accompanying drawings will be described in detail the present invention.

3 is a view showing the use of the balance weight of the motor according to the invention, Figure 4 is an enlarged view of the balance weight region of Figure 3, Figure 5 is a perspective view of the balance weight of Figure 3, Figure 6 It is a figure for demonstrating the effect | action of the balance weight of three. The same and equivalent parts as those described above and shown in the drawings will be described with the same reference numerals. As shown in these figures, the scroll compressor has a casing (11) which forms a sealed receiving space therein, and a fixed scroll (23) and a revolving scroll (25) coupled to each other so as to be movable relative to each other. A compression unit 21 accommodated in the upper upper region of the 11 to compress the refrigerant, and an electric motor 31 disposed below the internal compression unit 21 of the casing 11 to provide a driving force to the compression unit 21. Equipped with.

The electric motor 31 is composed of a stator 33 fixedly disposed inside the casing 11, and a rotor 35 rotatably disposed about the rotation shaft 37 inside the stator 33. On the upper end of the rotating shaft 37, an eccentric portion 38 is formed so as to eccentrically drive the turning scroll 25.

On the other hand, the balance weight 51 of the electric motor according to the embodiment of the present invention is integrally coupled to the upper end of the rotor 35 in the axial direction of the rotary shaft 37 to eliminate the imbalance.

The balance weight 51 of the present motor includes a fixed balance weight 53 and a fixed balance formed on the upper end of the rotor 35 so as to protrude to a predetermined height along the axial direction and extend in an arc shape along the circumferential direction. It is disposed rotatably with respect to the weight portion 53 includes a rotation balance weight portion 58 so that the center of gravity is moved outward along the radial direction of the rotor 35 by the action of the centrifugal force during the rotation of the rotary shaft 37 It is composed.

The fixed balance weight portion 53 includes a first balance weight portion 54a which protrudes at an upper end of the rotor 35 to a predetermined height and extends to have a length approximately half of a circumference along the circumferential direction, and the first balance weight. A second balance weight portion 54b protrudes from the portion 54a to a predetermined height and extends to have a length reduced with respect to the first balance weight portion 54a in the circumferential direction.

The fixed balance weight 53 is formed with depressions 55 recessed along the radial direction of the rotor 35 so as to accommodate the rotational balance weight 58, both sides of the depression 55 The shaft hole 56 is formed in the upper region so as to accommodate the rotation shaft 59 of the rotation balance weight 58 arranged horizontally in the axial direction of the rotation shaft 37.

By such a configuration, the rotation balance weight 58 is rotated upwardly about the rotation shaft 59 by the action of centrifugal force when the rotor 35 rotates, so that the center of gravity of the rotor 35 is in the radial direction of the rotor 35. By moving outward, a relatively large rotational balance force is generated. On the other hand, when the rotor 35 is stopped, the rotational balance weight 58 is accommodated so as to be disposed along the gravity direction inside the recess 55 by rotating downward about the rotation shaft 59 by its own weight.

7 is a perspective view of a balance weight of an electric motor according to another embodiment of the present invention, and FIG. 8 is a cross-sectional view taken along the line VII-VII of FIG. 7. As shown in these figures, the balance weight of the electric motor is a fixed balance weight portion which is fixed to protrude along the axial direction of the rotation shaft 37 on the opposite side of the eccentric portion 38 with the rotation shaft 37 therebetween. And a stopper 73 for limiting the range of rotation of the rotational balance weight portion 69 and the rotational balance weight portion 69 coupled to the fixed balance weight portion 63 so as to be relatively rotatable. It is.

A fixed balance weight portion 63 is formed at the upper end of the rotor 35 so as to face the eccentric portion 38 with the rotation shaft 37 therebetween, and the fixed balance weight portion 63 is the rotor 35. And a first balance weight portion 64a formed to be in contact with the second balance weight portion 64a and protruding from the first balance weight portion 64a along the axial direction.

The fixed balance weight portion 63 is provided with a receiving portion 65 for accommodating the rotating balance weight portion 69. The rotating balance weight portion 69 is rotated at both upper regions of the receiving portion 65. The rotation shaft 70 which supports it is arrange | positioned. The stopper support part 67 is formed in the upper side of the accommodating part 65 to protrude outward along the radial direction of the rotor 35, and the stopper support part 67 is the stopper 73 with respect to the rotation balance weight part 69. A female screw portion 68 is formed to adjust the relative position of the < RTI ID = 0.0 > The female screw portion 68 is screwed with a stopper 73 implemented in the form of a bolt, and the shock absorbing member 74 in the distal region of the stopper 73 so as to mitigate an impact upon contact with the rotational balance weight 69. Is provided.

By such a configuration, when the rotor 35 is rotated, the rotation balance weight 69 rotates upwardly about the rotation shaft 70 by the action of centrifugal force to come into contact with the shock absorbing member 74. ) And rotates integrally. On the other hand, when a rotational imbalance occurs due to the variation factor and the adjustment of the rotation range of the rotation balance weight portion 69 is performed, the stopper 73 may be properly rotated relative to the stopper support portion 67 in the corresponding direction.

9 is a perspective view of a balance weight of an electric motor according to still another embodiment of the present invention, FIG. 10 is a plan view of the balance weight of FIG. 9, and FIG. 11 is a view for explaining the operation of the balance weight of FIG. 9. As shown in these figures, the balance weight of the electric motor is a fixed balance weight portion which is fixed to protrude along the axial direction of the rotation shaft 37 on the opposite side of the eccentric portion 38 with the rotation shaft 37 therebetween. (83), the rotating balance weight portion 92 coupled to the fixed balance weight portion 83 so as to be relatively rotatable, and the rotating balance weight portion 92 so as to rotate in a direction opposite to the direction rotated by the action of the centrifugal force. It is comprised including the spring 97 which applies an elastic force.

A fixed balance weight portion 83 is formed at the upper end of the rotor 35 along the axial direction of the rotation shaft 37 so as to face the eccentric portion 38 with the rotation shaft 37 therebetween. The fixed balance weight portion 83 includes a first balance weight portion 84a formed to contact the rotor 35 and a second balance weight portion 84b protruding from the first balance weight portion 84a. Equipped.

Rotating balance weights 92 are disposed on both sides of the second balance weights 84b along the circumferential direction of the rotor 35 so as to be relatively rotatable, and upper portions of both sides of the second balance weights 84b. The support part 85 protrudes in the area | region so that the rotation balance weight part 92 can be rotatably supported. Each support portion 85 is formed with a shaft hole 86 so as to accommodate the rotation shaft 93 arranged in parallel with the rotary shaft 37, the support portion 85 on one side of each rotation balance weight portion 92 Coupling portions 94 are coupled to each other so as to be able to move relative to each other.

On the other side of each rotation balance weight portion 92 is provided with a spring 97 for applying an elastic force so that the rotation balance weight portion 92 rotated in the opposite direction by the action of the centrifugal force when the rotor 35 rotates. In addition, spring fixing parts 87 and 95 are formed on the side portions of the respective rotating balance weight parts 92 and the upper surfaces of the first balance weight parts 84a so that one end of each spring 97 may be fixed.

By this configuration, when the rotor 35 is rotated about the rotation axis 37, each rotation balance weight 92 is rotated about the rotation axis 93 to the outside along the radial direction of the rotor 35 By protruding to the center of gravity is moved to the outside to generate a relatively large rotational balance force and to promote the flow of air to cool the surroundings. On the other hand, when the driving of the rotor 35 is stopped, each of the rotational balance weights 92 is returned to the initial position arranged along the circumferential direction of the rotor 35 by the elastic force of the spring 97.

In the above-described embodiment with reference to FIGS. 3 to 6, the rotational shaft is arranged in the upper region of the rotational balance weight portion and configured to return to the initial position by its own weight, but a spring for applying an elastic force to return the rotational balance weight portion to the initial position. It may be configured to be provided. In addition, the rotation shaft of the rotation balance weight portion may be disposed in the lower region.

In the above-described embodiment with reference to Figures 7 and 8, the stopper is implemented in the form of a bolt to configure the rotational balance weight to adjust the range of rotation, for example, but the slider sliding along the axis direction of the rotary shaft, It may be configured to have a fixing screw for fixing the slider.

In the above-described embodiment with reference to FIGS. 9 to 11, the case in which the adjustment means for adjusting the rotation range of each rotation balance weight part is not illustrated is described, for example, but the stopper is formed in the second balance weight part in the form of a bolt. It may be configured to adjust the rotation range of each rotation balance weight.

In addition, in the above-described and illustrated embodiments, the balance weight of the electric motor according to the present invention has been described as an example, but may be applied to the lower end of the rotor, or simultaneously applied to the upper and lower ends. It can also be configured.

As described above, according to the present invention, it is disposed rotatably on the opposite side of the eccentric portion with the rotation axis therebetween so that the center of gravity is moved outward along the radial direction of the rotor by the action of centrifugal force during rotation of the rotation axis. By including the rotational balance weight portion, there is provided a balance weight of the motor which can obtain a relatively large rotational balance force without increasing its own mass and without increasing the length along the axial direction of the rotation axis.

In addition, according to the present invention, a relatively large rotational balance force can be obtained, and the size and / or mass of the balance weight can be reduced by that amount, thereby providing a balance weight of the motor which can be compactly configured.

Claims (10)

The center of gravity is moved along the radial direction of the rotor by the centrifugal force during the rotation of the rotor is disposed on the opposite side of the eccentric portion with the rotation axis of the rotor rotated about the rotation axis having an eccentric portion on one side between Balanced weight of the motor, characterized in that it comprises a rotating balance weight portion rotated relative to the rotor. The method of claim 1, And a fixed balance weight portion rotatably formed integrally with the rotor on the opposite side of the eccentric portion with the rotation axis therebetween, wherein the rotation balance weight portion is relatively rotatably coupled to the fixed balance weight portion. Balance weight of the motor. The method of claim 2, The balance weight of the rotation balance portion of the electric motor, characterized in that rotatably coupled around the rotating shaft coupled to the fixed balance weight portion in the axial direction of the rotation axis. The method of claim 3, The rotating shaft is disposed perpendicular to the ground, and the rotating balance weight portion is rotated by its own weight when the rotating shaft is stopped, the balance weight of the electric motor, characterized in that arranged in the direction of gravity. The method of claim 2, The balance weight of the rotational balance portion of the electric motor, characterized in that coupled to the rotational axis around the rotational shaft coupled to the fixed balance weight in parallel with the rotating shaft. The method of claim 2, The balance weight of the motor further comprises a spring for applying an elastic force to the rotating balance weight portion such that the rotating balance weight portion is rotated opposite to the direction of action of the centrifugal force. The method according to any one of claims 1 to 6, The balance weight of the motor further comprises a stopper in contact with the rotation balance weight portion to limit the rotation range of the rotation balance weight portion. The method of claim 7, wherein The stopper is a balance weight of the electric motor, characterized in that coupled to move the position relative to the rotation balance weight portion to adjust the rotation range of the rotation balance weight portion. The method of claim 8, The stopper is a balance weight of the electric motor, characterized in that the screwed. The method of claim 7, wherein And a shock absorbing member interposed between the stopper and the rotational balance weight portion.

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