KR101052715B1 - Thermal Overload Relay - Google Patents

Abstract

The present invention relates to a thermal overload relay used for the purpose of preventing burnout of an electric motor due to an overload, and more particularly, the structure of the reversing mechanism can be simply configured to facilitate manufacturing and assembly processing. It relates to a thermal overload relay which prevents the operation error of the device in advance, so that accurate reversal operation and return operation can be performed.

The thermal overload relay according to the present invention includes a lower case 110 in which a heating element 111, a main bimetal 112, and a shifter 113 are embedded, and an upper case 120 installed on an upper portion of the lower case 110. ), An adjustment link 131 rotatably installed on the upper case 120, and a rotation protrusion 141 rotatably installed on one side of the adjustment link 131 and moving the shifter 113. The release lever 132 to rotate in accordance with the rotation, the inverting mechanism 150 to invert according to the rotational movement of the release lever 132, and the normally closed contact is separated by the inversion of the reversing mechanism 150 ( 160 and a normally open contact 170, a trip button 180 located in the upper portion of the central portion of the inverting mechanism 150 to invert the inverting mechanism 150 in an overcurrent trip state, and the inverting mechanism 150 Normally closes the inversion mechanism 150 located at the upper end of the free end of the inverted state in the overcurrent trip state. In the thermal overload relay including a reset button 181 for returning to the original position in the low state, the inversion mechanism 150, one side is fixedly coupled to the terminal 155, the other side is formed as a free end, one side The lower surface of the fixed end is coupled to the free end, the reset button 181 is located at the upper side of the other side, in the normal state while closing the normal closing contact 160 and at the same time, the normal open contact 170 The contact closure frame 154 for opening the normal closing contact 160 and closing the normal open contact 170 at the same time, while opening the reverse mechanism 150 is inverted. Characterized in that the configuration.

Thermal Overload Relay, Reverse Mechanism, Trip, Reset Button

Description

Thermal Overload Relay

The present invention relates to a thermal overload relay used for the purpose of preventing burnout of an electric motor due to an overload, and more particularly, the structure of the reversing mechanism can be simply configured to facilitate manufacturing and assembly processing. It relates to a thermal overload relay which prevents the operation error of the device in advance, so that accurate reversal operation and return operation can be performed.

In general, the thermal overload relay constitutes an electronic switch with a magnetic contactor, and serves to prevent the motor from being burned out by tripping the circuit when the current supplied to the motor exceeds a preset current value.

That is, in the case of an AC motor, an alternating current of three phases (R, S, T) normally flows therein, and when any one of the three phases is disconnected and no current flows, the current is concentrated or overloaded. An accident occurs such that the windings are burned out due to an increase in temperature at the time of overcurrent. In order to prevent this, an overload relay as described above is generally used in the motor to prevent burnout at the time of overload or phase loss.

1 and 2 show a conventional thermal overload relay, Figure 1 is a perspective view of a conventional thermal overload relay, Figure 2 shows a longitudinal cross-sectional view of FIG. The conventional overload relay, as shown in Figures 1 and 2, is largely connected to the circuit between the power supply and the load, that is, the motor, the heating element 14 located in the lower portion of the overload relay that generates heat when an overcurrent or phase formation occurs ) And an opening / closing mechanism part located at an upper portion of the overload relay which is connected to the curvature of the main bimetal 13 that bends in accordance with the heating of the heating body 14 in the heating body 14 to open and close the circuit between the power supply and the load. Are distinguished.

Here, the shifter 15, which is connected to the main bimetal 13, the heating body 14, and the main bimetal 13, and moves horizontally in accordance with the curvature of the main bimetal 13, is incorporated in the lower case 12. In the outside, three main terminals (for three-phase alternating current) to which the power supply wires are connected are provided, and the upper case 22 connected to the upper part of the lower case 12 includes a release lever forming an opening / closing mechanism ( 23, a reversal mechanism 26, an auxiliary holder 27, and the like are incorporated.

In addition, one side of the inverting mechanism 26 provided in the upper case 22 is fixedly coupled to the terminal, one end of the other side is fitted into the groove portion 28 of the auxiliary holder 27 is coupled. When the reversal mechanism 26 is reversed, the other end of the reversal mechanism 26 fitted in the groove 28 of the subsidiary holder 27 rotates in a clockwise direction, and the subsidiary holder 27 moves upward. It protrudes out of the upper case to indicate the operating state of the relay, and the normally closed movable contact and the normally closed fixed contact are opened when the movable contact of the normally closed contact pressed on the pressing portion is released from the restrained state. Normally, the open movable contact is to be closed.

However, the auxiliary holder, one end of which is coupled to the groove part and interlocks with the reversing mechanism, is formed in a long rod shape in which a part of the upper part protrudes out of the upper case, which is relatively large for the reversing or returning operation of the reversing mechanism. When a load is applied and dust or fine materials are introduced from the outside and accumulated in the space between the auxiliary holder and the upper case according to a long time use, the auxiliary holder interferes with the reversal operation of the reversing mechanism, causing an operation error. And

In addition, by inserting one end of the reversing mechanism into the groove part of the auxiliary holder to operate in conjunction with the reversing mechanism, and assembled into the upper case, there is a problem that the internal structure of the case is complicated and takes a long time to manufacture.

Accordingly, the present invention has been made to solve the above problems, and by simplifying the configuration of the reversing mechanism part to prevent the operation error by the auxiliary holder during the reversal operation or return operation of the reversing mechanism, and improve the durability,

In addition, the upper case of the thermal overload relay can be easily assembled to improve the assembly and productivity.

In one embodiment of the present invention for solving the above-described problems, a lower case 110 in which a heating body 111, a main bimetal 112, and a shifter 113 are built-in, and an upper portion of the lower case 110. The upper case 120 is installed, the adjustment link 131 is rotatably installed on the upper case 120, and the rotation projection 141 is rotatably installed on the side of the adjustment link 131 and the shifter The release lever 132 which rotates in accordance with the movement of the 113, the inversion mechanism 150 which inverts according to the rotational movement of the release lever 132, and the connection is separated by the inversion of the inversion mechanism 150. A normal closed contact 160 and a normal open contact 170, a trip button 180 positioned above the center of the inverting mechanism 150 to invert the inverting mechanism 150 in an overcurrent trip state, and the Located in the upper portion of the free end of the reversal mechanism 150 is inverted to an overcurrent trip state In the thermal overload relay including a reset button 181 for returning the electric bulb 150 to its original position in a normally closed state, the inversion mechanism 150 is fixedly coupled to the terminal 155 on one side thereof. The side is formed as a free end, the lower surface of one side is fixedly coupled to the free end, the reset button 181 is located on the upper side of the other side, and in the normal state while closing the normal closing contact 160 at the same time In addition, the normal open contact 170 is opened, while in the state in which the inverting mechanism 150 is inverted, the normal closed contact 160 is opened and the normal open contact 170 is closed. Frame 154; provides a thermal overload relay, characterized in that further comprises a thermal overload relay, characterized in that the configuration further comprises.

Thermal overload relay according to the present invention, the normal open contact 170, the fixed terminal 171 for connecting the power to the outside and the contact 172 is fixedly coupled to the lower surface of one side of the fixed terminal 171 One side is fixedly coupled to the fixed contact portion 173 and the movable terminal 174 for connecting the power to the outside and the movable terminal 174 and the other side is formed as a free end and fixed to the upper surface of the free end It consists of a movable contact portion 177 is composed of an elastic terminal plate 176 is formed, the contact 175, the contact control frame 154, the pressing piece 156 is formed on the other side in the normal state The pressing piece 156 may press the upper surface of the elastic terminal plate 176 of the normally open contact 170 to open the normally open contact 170.

Preferably, the other side of the contact control frame 154 may be provided with a protrusion 157 together with the pressing piece 156, the reset button 181 may be located on the upper portion of the protrusion 157.

The thermal overload relay according to the present invention simplifies the inversion mechanism by omitting the auxiliary holder that has conventionally formed the inversion mechanism and thereby prevents an operation error caused by the auxiliary holder during the inversion operation or the return operation of the inversion mechanism. Can improve the durability,

In addition, the upper case of the thermal overload relay can be easily assembled to improve assembly and productivity.

DETAILED DESCRIPTION Hereinafter, embodiments of the present invention in which the above object can be specifically realized are described with reference to the accompanying drawings. In describing the embodiments, the same names and symbols are used for the same components, and additional description thereof will be omitted below.

3 is a perspective view showing the inverting mechanism 150 of the thermal overload relay 200 according to the present invention, Figure 4 is a normally closed contact 160 in a normal state in the thermal overload relay 200 according to the present invention And an operating state diagram showing a normally open contact 170 and a reversal mechanism 150, and FIG. 5 shows a normally closed contact 160 and a normally open contact in an overcurrent trip state in the thermal overload relay 200 according to the present invention. 170 is an operational state diagram showing the inversion mechanism 150.

6 is an operational state diagram illustrating a normal state of the thermal overload relay 200 according to the present invention, and FIG. 7 is an upper case in a trip state of the thermal overload relay 200 according to the embodiment of the present invention. 120 is an operational state diagram.

As shown in FIG. 3, the thermal overload relay 200 according to an exemplary embodiment of the present invention includes a heating body 111 and a main bimetal 112 forming a heater in the lower case 110. The shifter 113 is coupled to the free end of the bimetal 112.

An upper case 120 is coupled to an upper portion of the lower case 110, and the opening / closing mechanism 130, the normally closed contact 160, and the normally open contact 170 are formed in the upper case 120.

The adjusting link 131 constituting the opening and closing mechanism 130 is formed by bending the bimetal to serve as the temperature compensation bimetal 140, and the rotating protrusion 121 is provided on the side of the bent part to the upper case 120. It is rotatably coupled, the release lever 132 is rotatably formed on the rotating protrusion 121 provided on one side.

In addition, a support spring 145 for elastically supporting the adjustment link 131 is formed at the rear of the other side of the adjustment link 131 to press the adjustment link 131 toward the front adjustment dial 144, Fine adjustment screw 143 is screwed to the side of the other side of the adjustment link 131, the lower cam curved surface of the adjustment dial 144 provided on the upper surface of the upper case 120 of the support spring 145 It is pressed by the elastic force. The fine adjustment screw 143 finely adjusts the rotation angle of the adjustment link 131 so that the relay can be accurately operated with respect to the operating current.

One end of the release lever 132 is in contact with the inverting mechanism 150, one side of the inverting mechanism 150 is fixedly coupled to the terminal 155, the other side is formed as a free end to contact contact frame ( 154 is fixedly coupled with the lower surface of one side.

The reset button 181 is positioned at the upper side of the other side of the contact control frame 154, and is fixedly coupled to the free end of the inversion mechanism 150 to move together with the free end of the inversion mechanism 150. Will move down. The contact interrupting frame 154 closes the normally closed contact point 160 in a normal state and opens the normally open contact point 170, while in the state in which the inverting mechanism 150 is inverted, the normally closed contact point is closed. The contact 160 is opened and at the same time, the normal open contact 170 is closed.

In more detail, when the operation of the normal open contact 170 according to the reversal operation and the return operation of the reversal mechanism 150, as shown in Figs. 4 and 5, the normal open contact 170 is The fixed terminal 171 for connecting the power to the outside and the fixed contact portion 173 is formed with a contact 172 fixedly coupled to one side lower surface of the fixed terminal 171, and a movable terminal for connecting the power to the outside 174 and the movable terminal 174 is composed of an elastic terminal plate 176 having one side fixedly coupled, the other side is formed as a free end and the contact 175 is fixedly coupled to the upper surface of the free end It consists of a contact portion 177.

In addition, the movable contact portion 164 of the normally closed contact 160, the contact 158 is fixedly coupled to the lower surface of the other free end of the reversal mechanism 150, the contact 158 is the reversal mechanism 150 One side of the reversal mechanism 150 is electrically connected to the terminal 155 to be fixedly coupled to each other, and the fixed contact portion 165 is located at the lower side of the reversal mechanism 150, and one side of the reversal mechanism 150 is located on the terminal 161. It is fixedly coupled to the upper surface of the other side is composed of an elastic terminal plate 163 formed with a contact 162, in the normal state of the movable contact portion 164 of the normally closed contact 160 in the original position of the reversal mechanism 150 ) And the fixed contacts 165 are connected to form a closed state.

The trip button 180 is elastically installed in the upper center of the upper case 120 with a spring, and is installed at a position capable of rotating the reverse lever 133 by a pressing operation.

3 to 5, a lug portion 152 and an inverting portion 151 are formed in the inverting mechanism 150 made of a leaf spring material, and one side of the inverting mechanism 150 is fixedly coupled to the terminal 155 to be electrically connected. The other side is fixedly coupled to one side lower surface of the contact control frame 154 to the free end. In general, an elastic groove 153 is formed to protrude upward from a central portion of the inverting portion 151 so that the free end of the inverting mechanism 150 is inclined downward, and the inverting mechanism is formed by the elastic groove 153. As the 150 maintains the overall convex shape as a whole, the free end of the reversal mechanism 150 is formed to be inclined downward so that the normally closed contact 160 can be kept closed, while the reversal operation of the reversal mechanism 150 is maintained. When the lug portion 152 is pressed, the reversal mechanism 150 is elastically inverted into a downwardly convex shape as a whole so that the contact control frame 154 moves upwardly inclined upward with the free end of the reversal mechanism 150. do.

Hereinafter, the operation of the thermal overload relay 200 according to the present invention having the above configuration will be described in more detail with reference to FIGS. 4 to 7.

When an overcurrent flows through the heating element 111 wound around the main bimetal 112, the free end of the main bimetal 112 is bent by the heat of the heating element 111, so that the shifter 113 is shown in FIG. 5. , Move to the right direction, while the shifter 113 is moved while pressing the inversion lever 133 while rotating the release lever 132 counterclockwise around the rotating protrusion 121 formed on the adjustment link 131. The inversion lever 133 presses the lug portion 152 of the inversion mechanism 150, and the inversion portion 151 is elastically convex downwardly around the elastic groove 153 by the pressure of the lug portion 152. Is reversed.

The contact control frame 154 integrally fixed together with the free end of the inversion mechanism 150 by the elastic inversion of the inversion unit 151 is moved to the upper side, and fixed to one lower surface of the contact control frame 154. The pressurized piece 156 formed at the other side of the contact control frame 154 while the movable contact portion 164 of the normally closed contact 160 coupled to the free end portion is opened while leaving the fixed contact portion 165. The movable contact portion 177 of the normally open contact 170 is connected to the fixed contact portion 173 by the elastic force of the elastic terminal plate 176 while leaving the elastic terminal plate 176 of the normally open contact 170. It becomes lung.

Meanwhile, when the reset button 181 is pressed while the inversion mechanism 150 is inverted as described above, the reset button 181 moves downward to press the upper surface of the protrusion 157 of the contact control frame 154. At the same time, since the free end of the reversing mechanism 150 is pressed downward, the reversing portion 151 of the reversing mechanism 150 moves downward and convex upwardly about the elastic groove 153 while moving downward. It will return to the state of. Accordingly, the pressing piece formed on the other side of the contact control frame 154 presses the upper surface of the elastic terminal plate 176 to open the normally open contact 170, and is fixed to one side of the contact control frame 154. The movable contact portion 164 of the normally closed contact 160 of the free end is connected to the fixed contact portion 165 to close the normally closed contact 160.

In addition, when testing whether the mechanical operation of the relay occurs smoothly to press the trip button 180, pressing the trip button 180, the reverse lever 133 is pressed by the trip button 180 to rotate the reversal mechanism Since the inversion of 150, the operation of the relay can be easily tested.

As described above, the thermal overload relay according to the present invention is conventionally formed in a long rod shape so as to protrude to the outside, and the free end of the reversal mechanism 150 is fitted into the groove to be coupled to the reverse operation and the return operation. By omitting the holder, one side lower surface is integrally fixed to the free end of the inversion mechanism 150 to form a contact control frame 154 interlocked with the free end of the inversion mechanism 150, thereby inverting mechanism 150 The operation case of the auxiliary holder which is inserted into the guide groove of the upper case 120 at the time of reversal operation or return operation can be prevented, and the durability can be improved, and the upper case 120 of the thermal overload relay can be prevented. Since it is not necessary to assemble the auxiliary holder in the guide groove of the), the upper case 120 can be easily assembled and processed to improve the assembly and productivity.

It is to be understood by those skilled in the art that the present invention may be embodied in many other forms without departing from the spirit and scope of the invention,

Accordingly, the above-described embodiments are to be considered as illustrative and not restrictive, and all embodiments within the scope of the appended claims and their equivalents are included within the scope of the present invention.

1 is a perspective view showing a conventional thermal overload relay;

FIG. 2 is a longitudinal sectional view of the thermal overload relay along line II-II of FIG. 1; FIG.

3 is a perspective view showing an inversion mechanism 150 of the thermal overload relay 200 according to the present invention;

4 is an operational state diagram showing a normally closed contact 160, a normally open contact 170 and an inverting mechanism 150 in a normal state in the thermal overload relay 200 according to the present invention;

5 is an operational state diagram showing a normally closed contact 160, a normally open contact 170 and an inverting mechanism 150 in an overcurrent trip state in the thermal overload relay 200 according to the present invention;

6 is an operational state diagram showing a normal state of the thermal overload relay 200 according to the present invention; And

7 is an operational state diagram showing the upper case 120 in the tripped state of the thermal overload relay 200 according to the embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

110: lower case 111: heating element

112: main bimetal 113: shifter

120: upper case

130: opening and closing mechanism 131: adjustment link

132: release lever 133: reverse lever

140: temperature compensation bimetal 141: rotating projection

143: fine adjustment screw 144: adjustment dial

145 support spring

150: inversion mechanism 151: inversion unit

152: lug portion 153: elastic groove

154: contact control frame 155: terminal

156: pressure piece 157: protrusion

158: contacts

160: normally closed contact 161: terminal

162: contact 163: elastic terminal plate

164: movable contact portion 165: fixed contact portion

170: normally open contact 171: fixed terminal

172: contact point 173: fixed contact point

174: movable terminal 175: contact

176: elastic terminal plate 177: movable contact portion

180: trip button 181: reset button

200: thermal overload relay

Claims (3)

A lower case 110 in which a heating element 111, a main bimetal 112, and a shifter 113 are embedded, an upper case 120 installed on an upper portion of the lower case 110, and an upper case 120. Release lever 132 is rotatably installed on the adjustment link 131 is rotatably installed, and the rotation protrusion 141 provided on one side of the adjustment link 131 and rotates according to the movement of the shifter 113. ), The inverting mechanism 150 for inverting according to the rotational movement of the release lever 132, the normally closed contact 160 and the normally open contact 170, which are separated by inversion of the inverting mechanism 150, and A trip button 180 located in the upper portion of the center of the inverting mechanism 150 to invert the inverting mechanism 150 in an overcurrent trip state; and an overcurrent trip located in the upper portion of the free end of the inverting mechanism 150. Reset button for returning the inverted mechanism 150 inverted to the normal position in the closed state ( In the thermal overload relay comprising a (181), The reversal mechanism 150, One side is fixedly coupled to the terminal 155, the other side is formed as a free end, The lower surface of one side is fixedly coupled to the free end, and the reset button 181 is located on the other side of the upper side, and in the normal state while closing the normal closing contact 160, the normal open contact 170 ), While the reversal mechanism 150 is inverted, the contact closure frame 154 opens the normal closed contact 160 and closes the normal open contact 170. Thermal overload relay, characterized in that comprising a. The method of claim 1, The normal open contact 170, A fixed contact portion 173 having a fixed terminal 171 for connecting power to the outside and a contact 172 fixedly coupled to one lower surface of the fixed terminal 171, and One end is fixedly coupled to the movable terminal 174 and the movable terminal 174 for connecting the power to the outside, the other side is formed as a free end and the elastic terminal is formed with a contact 175 is fixedly coupled to the upper surface of the free end It consists of a movable contact portion 177 composed of a plate 176, The contact control frame 154, The pressing piece 156 is formed on the other side and in the normal state, the pressing piece 156 presses the upper surface of the elastic terminal plate 176 of the normally open contact 170 to open the normally open contact 170. Thermal overload relay, characterized in that. 3. The method of claim 2, The other side of the contact control frame 154 is formed with a protrusion 157 together with the pressing piece 156, Thermal overload relay, characterized in that the reset button 181 is located on the upper portion of the protrusion (157).

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