KR200219343Y1 - Shifter of thermal overload relay - Google Patents

Abstract

The present invention relates to a shift protector of an open phase protection type thermal overload relay which is used for the purpose of protecting the burnout when the motor is overloaded and protecting the burnout of the motor by moving the main body by bending and contacting the main bimetal due to the heating of the heating element. A case having a convex shape, a shifter formed horizontally according to the displacement of the main bimetal, and a protrusion for contacting the free end of the temperature-compensated bimetal, and a guide groove for embedding the shifter movably received by the bending of the main bimetal. A temperature compensation bimetal that has received a displacement by the shifter, a release lever that is coupled to the temperature compensation bimetal and rotates by an adjustment link and adjusts a position with a fine adjustment screw and an adjustment dial, and is reversed by the release lever. Reverse mechanism and compression coil spring, and the reverse mechanism A reset button for returning the inverting mechanism to its original position, the reset button having one auxiliary holder, normally insulated normally open and normally closed contact devices separated by the inverting mechanism, and a test button for testing the operation of the inverting mechanism. It is characterized by the configuration.

Description

Shifter of thermal overload relay

The present invention relates to a shifter of an open phase protection thermal overload relay which is used for the purpose of protecting the burnout when the motor is overloaded and protecting the burnout of the motor when the motor is missing. The present invention is designed to have a structure for effectively transferring the bending displacement of the bimetal to the compensating bimetal.

Conventional phase open protection overload relays are shown in FIGS. 1 and 2.

The thermal overload relay includes a reversal spring 95a which inverts as a result of displacement of the main bimetal 22 due to heat generation of the heating body 21 due to overcurrent,

A main bimetal 22 in which a heating body 21 is wound in a case 1 as an apparatus for operating a contact by an inversion operation of the inversion spring 95a;

Coupled to the free end 22a of the main bimetal 22, the guide groove 1a of the case 1 is supported by the bending of the main bimetal 22 so as to support the direction of the P arrow, and shifts during imaging (2). )Wow,

An opening / closing mechanism 4 disposed in the case 1 so as to be engageable with one end of the shifter 3 by the shifter 3 in contact with the lever 18,

A contact device 5 which is contacted and separated by the opening and closing mechanism 4,

The return device 6, which is fixed in the case of automatic return and free of operation in the case of manual return, is a main component and includes all the components in the case 1.

The opening / closing mechanism 4 is integrated with the release lever 8 which rotates at the point W through the adjustment link device 7 on the inner wall of the case 1 and contacts the later inversion spring 95a, and the free end is a shifter ( One end constituting the temperature compensating bimetal 9 and the control linkage 7 which can be combined with the tip of 3) is coupled to the release lever with a pin at X point, and coordinated with the adjustment link 10 moistened at W point. The cam 11a of the adjustment dial 11 which the other end of the link 10 engages, and the leaf spring 12 which makes the other end of the adjustment link 10 contact a cam.

The contact device 5 is constituted by a normally open contact 13, a normally closed contact 14, and an inverting spring 95a which are insulated from each other and can be used at different potentials.

The normally open contact 13 is composed of a terminal 98 for connecting a power source to the outside, a movable plate 98a fixed to the terminal 98 and a normally open movable contact 98b, and normally open movable contact 98b. ) And a movable plate 97a fixed by a normally open fixed contact 97b and a terminal 97.

The normally closed contact 14 is fixed to the terminal 95 and the terminal 95 and attached to the other end of the reverse spring 95a, which is inverted by contacting the release lever 8 and the reverse spring 95a, and is normally closed and fixed. It consists of the normally closed movable contact 95b which contacts the contact 96b, and consists of the normally closed fixed contact 96b, the terminal 96, and the movable plate 96a couple | bonded with the terminal.

The contact device 5 moves freely in the case 1 and is coupled to the reversal spring 95a so that the driving plate 17 freely oscillating in the case 1 drives the projection 17a which normally drives the open contact 13. ) And an operation display piece 17b for displaying the states of the normally open contact 13 and the normally closed contact 14.

The description of the operation in the above configuration is as follows.

When overcurrent flows to the heating body 21 wound around the main bimetal 22, the main bimetal 22 is bent by the heat generation of the heating body 21, and the shifter 3 is moved in the direction of the P arrow.

By moving the shifter 3, the distal end portion presses the free end of the temperature compensation bimetal 9 to rotate the release lever 8 integrated with the temperature compensation bimetal 9 counterclockwise around the point X, Rotation of the release lever 8 causes the distal end portion 8a to rotate clockwise in the upper end portion 95d of the reversal spring 95a so that the normally closed movable contact 95b is opened, and the driving plate 17 is opened. As a result, the normally open movable contact 98b in which the normally open movable contact 98b is in the open state is switched to the closed state.

When the operating current is to be changed, it is necessary to change the inversion position since the heat generation of the heating body 21 and the amount of curvature of the main bimetal 22 change with the change of the operating current.

In this case, therefore, it is possible to move the point X of the release lever 8 by rotating the adjustment dial 11 to rotate the point W around the cam 11a and the other end of the adjustment link 10 axially.

However, in the prior art having the above-described configuration and operation, since the mechanism of the thermal overload relay is installed on the side of the thermal type, the shifter has a structure suitable for this. There is a problem that can not be used in the arrangement, and because the structure is flat when the phase-protection type thermal overload relay is vibrated, side flow occurs and affects the reversal position of the reversing mechanism, which may result in incomplete operation characteristics. There was this.

The object of the present invention is to improve the shortcomings of the prior art and to have a structure capable of most stably transmitting the bending displacement of the main bimetal to the mechanism in the phase-protection type thermal overload relay in which the mechanism is disposed above the thermal portion.

In addition, the present invention can most effectively transfer the bending displacement of the bimetal to the mechanism part in the phase-protection type thermal overload relay in which the mechanism part is configured above the moving part, and prevents the vertical movement of the shift when the thermal overload relay is vibrated. The purpose is to obtain the effect that can be transmitted to the mechanical portion of the bending displacement of the bimetal most stably.

As a means for achieving the above object,

The convex shape 3b which moves the main body by bending and contacting the main bimetal 2 by the heat generation of a heating body, and the protrusion part which flows horizontally according to the displacement of the main bimetal 2, and the free end of a temperature compensation bimetal contact | connects. A shifter 3 composed of 3a,

A case 9 having a guide groove 9a for embedding a shifter movably received by the curvature of the main bimetal 2;

A temperature compensation bimetal 5 having received a displacement by the shifter 3,

A release lever 7 coupled with the temperature compensating bimetal 5 and rotating with an adjustment link 11 and adjusting position with a fine adjustment screw 12 and an adjustment dial 6,

An inversion mechanism 13 and a compression coil spring 18 inverted by the release lever 7,

An auxiliary holder 16 coupled with the inversion mechanism 13;

A reset button (10) having contact devices of normally open (19) and normally closed (17, 18) insulated from each other by the inverting mechanism (13) and returning the inverting mechanism (13) to its original position;

Characterized in that it comprises a test button 20 for testing whether the operation of the inversion mechanism 13 is desired.

1 is a schematic diagram of a general phase-opening protection thermal overload relay.

Figure 2 is an enlarged view of the shifter in a typical phase-protection thermal overload relay.

3 is a block diagram of an open circuit protection overload relay of the present invention.

Figure 4a, b, c is an enlarged configuration diagram and shifter, case enlarged configuration diagram of the present invention phase-protection thermal overload relay.

<Explanation of symbols for main parts of drawing>

1: case 2, 3, 23: shifter

4: switchgear 5: contact device

6: return device 7: adjusting link device

11: adjustment dial 13: open contact

14: closed contact 21: heating element

22: main bimetal

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

3 and 4A, 3B, and 3C, the shifter 3 moves horizontally to the right as the shifter 3 moves to the right as the displacement of the main bimetal 2 is generated by the heating of the heating element 1. 3) the protrusion 3a integrated with the temperature compensating bimetal 5 is pushed to the right by contacting the free end of the temperature compensating bimetal 5 inside the auxiliary case 4 and coupled with the temperature compensating bimetal 5. The release lever 8 is rotated counterclockwise.

At this time, the main bimetal (2) in which the heating body (1) is wound in the case (9) as a device for distal end of the release lever (8) to operate the reversal mechanism (13),

A shifter 3 coupled to each of the free ends of the main bimetal 2 and supported by the guide groove 9a of the upper part of the case 9 so as to be movable in the right direction by the bending of the main bimetal 2;

An opening / closing mechanism disposed in the auxiliary case 4 so as to be coupled to one end of the shifter 3,

When the contact device and the contact device contacted and separated by the switchgear are automatically returned, the return device supported by the reset button 10 to the automatic return position is supported. It is composed of the main components.

The main terminal 22, the main bimetal 2, on which the main terminal 22 and the heating body 1 are wound, are coupled to each other by the terminal connector 23 in the case 9, and the main bimetal 2 It is coupled to the free ends of the main bimetal 2, respectively. Then, there is a shifter 3 supported by the guide groove 9a of the case 9 so as to be movable by the bending of the main bimetal 2.

The temperature compensation bimetal 5 is supported by the circular projection 7a and the groove 7b of the release lever 7. And the release lever 7 is connected to the circular projection (11a) of the upper left of the adjustment link 11 to rotate around the center point of the circular projection (11a).

The adjusting link 11 is fitted to the circular protrusion 4a of the auxiliary case 4 and rotates about the center point of the circular protrusion 4a.

Moreover, it is supported by the leaf spring 23 on the inner wall right side of the auxiliary case 4, and rotates by adjusting the fine adjustment screw 12 and the adjustment dial 6. As shown in FIG.

Here, the adjusting dial 6 is assembled by fitting into the upper groove of the auxiliary case 4, and when the temperature compensation bimetal 5 is pushed to the right, the center point of the circular protrusion 11a on the upper left of the adjusting link 11 is adjusted. At the same time, the release lever 7 and the temperature compensating bimetal 5 simultaneously rotate counterclockwise to come into contact with the central portion 13a of the inversion mechanism 13 so that the inversion mechanism 13 is inverted.

At this time, the inversion mechanism 13 is coupled to the terminal 14a, the compression spring 15 is fitted in the synchronous shape 13b in the center of the inversion mechanism 13, and the inversion mechanism 13 is arbitrarily set by the compression force. Direction, the right groove 16a of the auxiliary holder 16 is connected with the left side of the inversion mechanism 13.

Normally the closing movable contact 17 is engaged with the terminal 14b, and the lower part 16b of the auxiliary holder 16 has pressed down the left side of the normally closing movable contact 17 normally.

When the auxiliary holder 16 is in the energized state, the auxiliary case 4 does not protrude above the auxiliary case 4, and when the auxiliary holder 16 is open, the auxiliary holder 16 protrudes above the auxiliary case 4.

Normally, the closed fixed contact 18 is coupled to the terminal 14c, and the normally closed movable contact 17 normally contacts the closed fixed contact 18 so that the terminal 14b and the terminal 14c are in an energized state.

The normally open fixed contact 19 is coupled to the terminal 14d, the reset button 10 is coupled to the upper right inside 4b inside the auxiliary case 4, and the lower end of the reset button 10 10a normally supports the open fixed contact 19 from above.

The test button 20 serves to elastically support the test button 20 because the compression spring 8 is seated inside the upper center of the auxiliary case 4.

In the above configuration, the description of the operation is as follows.

When overcurrent flows to the heating body 1 wound on the main bimetal 2, the main bimetal 2 is bent by the heat of the heating body 1, and comes into contact with the convex shape 3b of the shifter 3 to shift the shift 3 Move).

As the shifter 3 moves, the tip 3a of the shifter presses the free end of the temperature compensation bimetal 5 to move the release lever 7 connected to the temperature compensation bimetal 5 to the circular projection 11a of the adjustment link 11. It rotates clockwise about the center point of) so that the normally closed fixed contact 18 and the normally closed movable contact 17 are opened and the normally open movable contact 22 positioned in the open state is switched to the closed state.

When the operating current is to be changed, it is necessary to change the inversion position since the heat generation of the heating body 1 and the amount of curvature of the main bimetal 2 change with the change of the operating current.

Thus, at this time, the adjustment link 11 fixed by the fine adjustment screw 12 in contact with it along the shape of the cam curve of the adjustment dial 6 by turning the adjustment dial 6 has a circular protrusion ( The inversion position of the inversion mechanism 13 is changed by changing the fixed position of the release lever 7 by rotating about the center point of 4a).

At this time, in order to return the position of the inversion mechanism 13 to the original position, the reset button 10 is used.

When the reset button 10 is pressed, the reset button 10 is moved downward so that the reset button 10 pushes the normally open fixed contact 19 downward and the left part of the inversion mechanism 13 is pressed down and compressed. The reversal of the force of the spring 15 and the reversal mechanism 13 causes the reversal mechanism 13 to move down again with the subsidiary holder 16 so that the subsidiary holder 16 normally moves the closed movable contact 17 down. By pressing, the normally closed movable contact 17 comes into contact with the normally closed fixed contact 18 to energize the terminal 14b and the terminal 14c.

Use the test button 20 to test if the action is mechanically desired. When the test button 20 is pressed, the test button 20 pushes the left lever 7d of the release lever 7 downward to reverse the inversion mechanism 13.

As described above, the present invention can most effectively transfer the bending displacement of the bimetal to the mechanism part in the phase-protection type thermal overload relay in which the mechanism part is configured above the moving part, and when the thermal overload relay is vibrated, the up, down, left and right flow of the shift It provides the effect that can be transmitted to the mechanical portion of the biaxial bending displacement most stably by preventing the.

Claims (1)

The convex shape 3b which moves the main body by bending and contacting the main bimetal 2 by the heat generation of a heating body, and the protrusion part which flows horizontally according to the displacement of the main bimetal 2, and the free end of a temperature compensation bimetal contact | connects. A shifter 3 composed of 3a, A case 9 having a guide groove 9a for embedding a shifter movably received by the curvature of the main bimetal 2; A temperature compensation bimetal 5 having received a displacement by the shifter 3, A release lever 7 coupled with the temperature compensating bimetal 5 and rotating with an adjustment link 11 and adjusting position with a fine adjustment screw 12 and an adjustment dial 6, An inversion mechanism 13 and a compression coil spring 18 inverted by the release lever 7, An auxiliary holder 16 coupled with the inversion mechanism 13; A reset button (10) having contact devices of normally open (19) and normally closed (17, 18) insulated from each other by the inverting mechanism (13) and returning the inverting mechanism (13) to its original position; A shifter of a thermal overload relay, characterized in that it consists of a test button 20 that tests whether the operation of the reversal mechanism 13 is desired.