KR20040102439A - Preventing device of centrifugal weight for single phase induction motor - Google Patents

Abstract

PURPOSE: A device is provided to prevent operation failure of a centrifugal switch and damage of an induction motor by preventing a centrifugal weight from escaping from a guide due to an excessive centrifugal force. CONSTITUTION: A centrifugal switch for a single phase induction motor comprises a rotating shaft(10), a sleeve(120), a slider(30), and a centrifugal weight(140). The sleeve has a pair of guides(123) coupled to the rotating shaft and extended outward along a radial direction. The slider is coupled to the sleeve, and slides along the axial direction of the rotating shaft, with respect to the sleeve, so as to open/shut a start switch(60). The centrifugal weight has one side with a guide accommodating groove, and the other side coupled to the slider. The centrifugal weight permits the slider to slide along the axial direction of the rotating shaft, with respect to the sleeve, during rotation of the rotating shaft. A centrifugal weight guide structure includes a guide groove formed along the lengthwise direction of the guide of the sleeve; and a guide protrusion arranged on the circumference of the guide accommodation groove of the centrifugal weight such that the guide protrusion corresponds to the guide groove.

Description

Centrifugal weight prevention structure of centrifugal switch for single-phase induction motor {PREVENTING DEVICE OF CENTRIFUGAL WEIGHT FOR SINGLE PHASE INDUCTION MOTOR}

The present invention relates to a centrifugal switch for a single phase induction motor, and more particularly, to a centrifugal weight preventing structure of a centrifugal switch for a single phase induction motor to prevent the centrifugal weight from deviating from the guide for guiding the centrifugal weight by excessive centrifugal force. will be.

In general, an electric motor is a device that converts electrical energy into mechanical energy, and is divided into a DC motor and an AC motor according to a power source used. The AC motor may be further divided into an induction motor, a synchronous motor, a rectifier motor, and the like.

The induction motor is divided into three-phase induction motor and single-phase induction motor, and the single-phase induction conductor is generally simple in structure, robust, and relatively easy to obtain a single-phase power source. Although single-phase induction motors cannot be started by themselves, they have auxiliary windings or starting windings having a phase difference from the main windings in order to generate starting torque. When 70 to 80% of the speed is reached, a centrifugal switch is provided to open the auxiliary winding from the main winding.

1 to 7 show a conventional single-phase induction motor centrifugal switch, Figure 1 is a side view of the single-phase induction motor centrifugal switch, Figure 2 is a cross-sectional view taken along the line II-II of Figure 1, Figure 3 Figure 4 is a front view of the sleeve, Figure 4 is a side view of the sleeve, Figure 5 is a front view of the centrifugal weight, Figures 6 and 7 are partially enlarged perspective views showing the front and rear operation state of the centrifugal weight of the centrifugal switch for a single-phase induction motor.

As shown in these figures, the single-phase induction motor centrifugal switch, the sleeve 20 is rotatably integrally coupled to the rotary shaft 10 of the single-phase induction motor, and the sleeve and at the same time rotatable integrally with the sleeve 20 Slider 30 which slides along the axial direction of the rotating shaft 10 with respect to the 20, and operates the starting switch 60 so that the auxiliary winding of the single-phase induction motor is opened from the main winding, and one side is provided with the slider 30. A pair of centrifugal weights 40, one end of which is coupled relative to each other so as to be rotated by centrifugal force during rotation of the rotational shaft 10 so that the slider 30 moves along the axial direction with respect to the sleeve 20 It is composed of a pair of springs 50 coupled to the weight 40 to apply an elastic force in the direction in which the centrifugal weight 40 approaches each other.

The sleeve 20 has a cylindrical portion 21 having a cylindrical shape so as to accommodate the rotation shaft 10 therein, and extends in both lateral directions of the cylindrical portion 21 to slide the centrifugal weight 40. Ribs 22 are provided to protrude on both sides of the guide 23 and the cylindrical portion 21 along the longitudinal direction, so that the slider 30 is integrally rotated and the sliding movement is possible.

The guide 23 includes a guide support 24 along a protruding direction, a semicircular guide protrusion 25 protruding from an upper surface along a length of the guide support 24, and the guide support 24.

The slider 30 has a cylindrical body 31 having a rib receiving groove 33 formed on an inner circumferential surface along a longitudinal direction of the cylinder portion 21 so as to allow relative movement to the outside of the cylindrical portion 21, and one end of the body 31. The collar 32, which is an enlarged portion of the diameter, and the one side region of the centrifugal weight 40 are disposed on both sides of the body 31 so as to contact the operation lever 61 of the start switch 60 to open and close the start switch 60. A centrifugal weight receiving groove 34 is provided to open outward in the axial direction of the rotation shaft 10 so as to be movably accommodated.

The centrifugal weight 40 has a substantially triangular shape with a horizontal portion 41 disposed substantially parallel to the collar 32, a vertical portion 42 disposed substantially perpendicular to the horizontal portion 41. It consists of the side part 43.

One side of the side portion 43 is formed with a spring support portion 44 protruding and bent from the horizontal portion 41 so that each end of the spring 50 can be coupled and supported, the vertical portion 42 is a guide A guide receiving groove 45 through which the 23 may be coupled is provided.

The guide accommodating groove 45 accommodates the guide protrusion 25 in connection with a rectangular support part accommodating groove 46 for accommodating the guide support part 24 and one side surface of the support accommodating groove 46. Semi-circular projection receiving groove 47 is formed.

By such a configuration, when the rotary shaft 10 is stopped, the centrifugal weight 40 is positioned at an initial position disposed adjacent to the rotary shaft 10 by the elastic force of the spring 50, and the slider 30 is formed by the slitting portion ( It is arranged at a position relatively far from the guide 23 of 20). At this time, the operation lever 61 of the start switch 60 is located at a starting position where power can be supplied to the auxiliary winding, and in this state, when the power is applied to the main winding and the auxiliary winding, the rotary shaft 10 rotates. do.

When the rotational speed of the rotary shaft 10 reaches a rotational speed of approximately 70 to 80% of the synchronous speed, the centrifugal force acting on the centrifugal weight 40 becomes larger than the tensile force of the spring 50 so that the centrifugal weight 40 is guided. The slider 30 moving relative to the centrifugal weight 40 while moving outward along the 23 is moved toward the end of the guide 23 of the sleeve 20 in the axial direction of the rotational shaft 10 so that the collar 32 When pressing the operation lever 61 to operate the start switch, the power is opened from the auxiliary winding to the main winding, and the rotary shaft 10 continues to rotate by the main winding.

However, when the centrifugal weight 40 moves along the guide 23 by centrifugal force and the centrifugal weight exceeds the elastic force of the spring that elastically fixes each centrifugal weight to be positioned on the guide line, the centrifugal weight is ejected from the guide end to stop the operation of the centrifugal switch. Problems occur that cause inability and breakage of components.

According to the present invention devised to solve the above problems, to provide a centrifugal separation prevention structure for a single-phase induction motor to prevent the operation of the centrifugal switch and the breakage of the induction motor by the centrifugal addition is separated from the guide by excessive centrifugal force. For that purpose.

1 is a side view of a conventional single-phase induction motor centrifugal switch;

2 is a cross-sectional view taken along line II-II of the prior art;

3 is a front view of a conventional sleeve,

4 is a plan view of a conventional sleeve,

5 is a side view of a conventional centrifugal weight,

Figure 6 is a view showing a state before the centrifugal shift operation of the conventional centrifugal switch for single-phase induction motor,

7 is a view showing a state after the operation of the centrifugal weight of the conventional centrifugal switch for single-phase induction motor,

8 is a side view of a centrifugal switch for a single phase induction motor according to an embodiment of the present invention;

9 is a partial front cross-sectional view of the sleeve of the present invention;

10 is a partial plan view of the sleeve of the present invention,

11 is a side view of the present invention centrifugal weight,

12 is a partially enlarged perspective view showing a state in which a centrifugal weight is engaged in a centrifugal switch for a single phase induction motor according to the present invention;

FIG. 13 is a partially enlarged perspective view of FIG. 12;

14 or 15 is a view showing a modified example of the centrifugal weight separation prevention structure for a single-phase induction motor of the present invention.

Explanation of symbols on the main parts of the drawings

10: axis of rotation 30: slider

50: spring 60: start switch

61: operating lever 120: sleeve

123: the guide 124: guide support

125: guide groove 126, 126 ', 126' ': centrifugal weight separation prevention protrusion

140: centrifugal weight 145: guide receiving groove

146: support receiving groove 147: guide projection

In order to achieve the above object, the present invention is a rotatable shaft, a sleeve portion having a pair of guides rotatably coupled to the rotary shaft integrally and extending outward in a radial direction, and rotatable integrally with the sleeve And a slider for sliding relative opening and closing of the starting switch along the axial direction of the rotary shaft, and a guide receiving groove provided at one side so as to slide along the guide and the other side relative to the slider. In the centrifugal switch of the single-phase induction conductor consisting of a centrifugal weight which is coupled to the slide so as to slide the slider with respect to the sleeve in the axial direction of the rotation axis when the rotation axis is rotated, a constant curvature along the longitudinal direction of the guide of the sleeve Guy formed with grooves It is achieved by the groove and the centrifugal weight guide structure of the single-phase induction motor centrifugal switch for on the centrifugal weight guide receiving groove on one side of the main surface characterized in that provided with a guide protrusion corresponding to the guide groove.

Here, the guide groove is a centrifugal guide structure of a centrifugal switch for a single-phase induction motor, characterized in that it has the same curvature as the movement trajectory of the centrifugal weight.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings, and the same and equivalent parts as those described above and illustrated will be described with the same reference numerals for convenience of description.

Figure 8 is a side view of the centrifugal switch for a single-phase induction motor according to an embodiment of the present invention, Figure 9 is a partial front cross-sectional view of the sleeve of the present invention, Figure 10 is a partial plan view of the sleeve of the present invention, Figure 11 is the present invention centrifugal It is a side view of a weight, FIG. 12 is a partially expanded perspective view of the centrifugal weight fastening state of the centrifugal switch for single-phase induction motors of this invention, and FIG. 13 is a partially enlarged perspective view of FIG.

As shown in these drawings, the single-phase induction motor centrifugal switch according to an embodiment of the present invention, the guide 123 is rotatably coupled to the rotary shaft 10 and protruded along the radial direction of the rotary shaft 10. And a slider 30 rotatably integrated with the sleeve 120 and slidably coupled along the axial direction of the rotational axis 10 with respect to the sleeve 120, and one side of the slider 120. A pair of centrifugal weights 140 coupled to the other side so as to be movable relative to the other side and slidably coupled along the guide 23, and one end thereof are respectively coupled to the centrifugal weight 140 so that the centrifugal weight 140 is It is composed of a pair of springs 50 to apply an elastic force to approach each other.

The centrifugal weight 140 has a horizontal portion 141 disposed substantially parallel to the collar 132, a vertical portion 142 disposed substantially perpendicular to the horizontal portion 141, and an amount substantially forming a triangular shape. Side 143.

The side portion 143 is formed with a spring support portion 144 protruded and bent from the horizontal portion 141 on one side so that each end of the spring 150 can be coupled and supported, the vertical portion 142 A guide receiving groove 145 may be provided through which the guide 123 of the sleeve 120 to be described later may be coupled.

The guide accommodating groove 145 has a rectangular support part accommodating groove 146 for accommodating the guide support part 124 and protrudes corresponding to the guide groove 125 on one side main surface of the support part accommodating groove 146. The guide protrusion 147 is provided.

The sleeve 120, the cylindrical portion 121 having a cylindrical shape so that the rotary shaft 10 is accommodated therein, and extends in both sides of the cylindrical portion 121 to guide the sliding centrifugal 140. The guide 123 and the rib 22 is formed to protrude on both sides along the longitudinal direction of the cylindrical portion 121 so that the slider 30 is integrally rotated and the sliding movement is possible.

The guide 123 may include a guide support 124, a guide groove 125 having a predetermined cross-sectional shape along the length direction of the guide support 124, and an intaglio end of the guide support 124. Is formed to protrude so as to close the guide groove is provided with a centrifugal weight separation preventing projection 126 for preventing the separation of the centrifugal weight (140).

In addition, as shown in FIG. 14, the centrifugal deviation preventing protrusion 126 ′ contacts one side of the guide receiving groove 125 of the centrifugal weight to prevent the centrifugal weight 140 from being separated by excessive centrifugal force. It is preferable to form so as to protrude more than a certain height than the height of the guide support 124.

In addition, as shown in FIG. 15, the separation preventing protrusions 126 ″ are formed to have a thickness reinforcement with a predetermined inclination angle θ upward from the bottom surface of the guide support 124, and spaced apart from each other by centrifugal force. It is even more desirable to make contact with the vertical plane of the late centrifugal spine.

According to this configuration, the centrifugal guide structure of the centrifugal switch for single-phase induction motor according to an embodiment of the present invention, when the power is applied to the auxiliary winding of the stator is started on the rotor to rotate the rotary shaft 10 When the rotational speed of the rotation shaft 10 reaches a constant speed, the centrifugal weight 40 moves along the guide 23 in a direction away from the rotation shaft 10 by the action of the centrifugal force.

At this time, the guide protrusion of the guide receiving groove 145 corresponding thereto along the guide groove 125 formed along the longitudinal direction of the guide 123 coupled through the guide receiving groove 145 of the centrifugal weight 40. 147 is slipped and the centrifugal weight moves, and the slider 30 relative to the centrifugal weight 40 is moved toward the end of the guide 23 of the sleeve 20 along the axial direction of the rotary shaft 10. When the collar 32 presses the operation lever 61 to operate the start switch, the power is opened from the auxiliary winding to the main winding, and the rotary shaft 10 continues to rotate by the main winding.

At this time, when the tensile force of the soup (ring 50) fixing the centrifugal weight 140 is weakened or the centrifugal weight receives excessive centrifugal force due to abnormal operation, the guide protrusion 123 of the sleeve portion 120 which guides the centrifugal weight 140 is guided. The centrifugal weight can be prevented from escaping from the guide by the centrifugal weight separation prevention protrusions 126, 126 'and 126 " protruding from the tip of the tip.

As described above, according to the present invention, it is possible to prevent the separation of the centrifugal weight so that the smooth centrifugal switch operates and to prevent the internal parts of single-phase induction transmission caused by the separation of the centrifugal weight.

Claims (3)

A sleeve having a rotational shaft, a sleeve integrally rotatably coupled to the rotational shaft and extending outward in a radial direction, and rotatably coupled integrally with the sleeve and along the axial direction of the rotational shaft A slider for opening and closing the start switch relative to the movement and one side is provided with a guide receiving groove which is slid along the guide and the other side is coupled to the slider so as to move relative to the slider when the rotary shaft is rotated to the sleeve In the centrifugal switch of the single-phase induction conductor consisting of a centrifugal weight which slides in the axial direction of the rotary shaft with respect to The sleeve is a single-phase induction motor, characterized in that the projection preventing projection for preventing the separation of the centrifugal weight by closing the guide groove formed in the guide end formed with a guide groove for guiding the centrifugal weight along the guide longitudinal direction Centrifugal weight escape prevention structure. The method of claim 1, The separation prevention projection is a centrifugal weight separation prevention structure for a single-phase induction motor, characterized in that the thickness is reinforced to have a predetermined inclination angle from the bottom of the guide groove. The method according to claim 1 or 2, The separation prevention protrusion is a centrifugal weight separation prevention structure for a single-phase induction motor, characterized in that the protrusion formed higher than the side height of the guide.