KR200343539Y1 - Thermal overload relay - Google Patents

Abstract

The present invention relates to a thermal overload relay, and in particular, to install a switch structure assembly for tripping a plurality of contact parts to reduce the space of the device to the upper side of the heating assembly that generates heat by overcurrent and the user's trip operation test of the device The present invention relates to a thermal overload relay capable of easily checking the ON / OFF operation state of a contact portion without using a conventional tester.

Description

Thermal Overload Relay {THERMAL OVERLOAD RELAY}

The present invention relates to a thermal overload relay, and in particular, to install a switch structure assembly for tripping a plurality of contact parts to reduce the space of the device to the upper side of the heating assembly that generates heat by overcurrent and the user's trip operation test of the device The present invention relates to a thermal overload relay for easily checking the ON / OFF operation state of a contact point at the outside.

In general, a thermal overload relay (TOR) trips a circuit after a specified time when the current supplied to the motor exceeds a preset current value for the purpose of preventing burnout when the motor is overloaded. This is an electric device that plays an important role in preventing the motor from burning out.

In a typical motor, current of three phases (R phase, S phase, T phase) flows. At this time, if any of the three phases is disconnected and no current flows, an overload occurs as the current is concentrated in the remaining phases. As a result, problems such as damage to the winding insulation due to the temperature rise due to the overload occur. Therefore, it is common to install a thermal overload relay in the motor to prevent this.

Such a conventional thermal overload relay is composed of a heater section that normally generates heat due to an overcurrent, and an opening and closing mechanism section that mechanically operates in accordance with the heat generation of the heater section to trip a predetermined contact section.

However, since the opening and closing mechanism of the conventional thermal overload relay is usually installed on the side of the heater, the horizontal size of the thermal overload relay increases, and as the size of the horizontal overload relay increases, the relay in the switchboard is increased. When installing, there is a problem that it is difficult to compactly configure the electrical equipment.

In addition, a user may use a separately provided tester to check whether a plurality of contact parts (a contact part and b contact part) installed in the opening / closing mechanism part are turned on / off during a trip operation test of the device. There is a very uncomfortable problem because you have to check one by one.

The present invention has been made to solve the above problems, the object of the present invention is to install a switch assembly for tripping a plurality of contact parts for reducing the space of the device to the upper side of the heating assembly that generates heat by overcurrent The present invention provides a thermal overload relay further including an operation indicator to enable a user to easily check the ON / OFF operation state of a contact portion from the outside without using a conventional tester.

In order to achieve the above object, the thermal overload relay of the present invention includes a main body part including a main bimetal part that is curved to one side and a slide part that slides to one side according to the displacement of the main bimetal part when an overcurrent occurs. Comprising a heat generating assembly and a switchgear assembly for tripping a plurality of contact parts by operating in accordance with the displacement of the main bimetal part, the switchgear assembly is installed on the upper side of the main body portion for supporting various parts Body portion; A compensation bimetal installed in the auxiliary body to receive the displacement of the slide; A trip part rotatably installed in the auxiliary body part and fixed to the compensation bimetal to rotate in accordance with the movement of the slide part; A closed contact part in which the first movable / fixed contact is normally closed and an open contact part in which the second and third movable contact points are normally opened so as to be separately connected according to the rotational movement of the trip part; A reset bar and a vertical movement of the reset bar and the reset bar for testing whether the operation is performed smoothly while returning the closed contact part and the open contact part to their original positions are installed to be vertically movable above the open contact part. And operation display means for displaying an operating state of the closed contact portion and the open contact portion in accordance with the operation of the movable contact.

In the above-described configuration, the operation display means is rotatably installed in the auxiliary body part, the test lever and one side of which is rotated at a predetermined angle in accordance with the vertical movement of the reset bar and one side is caught by the test lever to the In addition to the vertical movement in accordance with the rotational movement, the end is fixedly coupled to the first movable contact point, and vertically moved according to the operation of the first movable contact point to easily see the operating state of the closed contact portion and the open contact portion from the outside It is preferable to include a display bar provided to be able to.

1 is an internal configuration diagram showing a thermal overload relay according to an embodiment of the present invention,

Figure 2 is a perspective view of the main portion separately showing the switchgear assembly of the thermal overload relay according to an embodiment of the present invention.

* Description of symbols on the main parts of the drawings *

100: heating assembly, 110: main bimetal part,

110a: free end, 120: slide,

125: protrusion, 130: main body,

200: switchgear assembly, 210: auxiliary body portion,

215: support protrusion, 220: compensation bimetal,

230: trip part, 240: closed contact part,

241: first movable contactor, 241a: first movable terminal,

242: first fixed contactor, 242a: first fixed terminal,

250: open contact portion, 251: second movable contactor,

251a: second movable terminal, 252: third movable contact,

252a: third operation terminal, 260: reset bar,

265: locking projection, 270: operation display,

271: test lever, 272: indicator bar,

272a: locking groove, 280: current adjustment unit,

281: cam wheel part, 282: current adjustment lever,

283 fine-tuning screw

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. This embodiment is not intended to limit the scope of the present invention, but is presented by way of example only.

1 is an internal configuration diagram showing a thermal overload relay according to an embodiment of the present invention, Figure 2 is a perspective view of the main portion separately showing the switch structure assembly of the thermal overload relay according to an embodiment of the present invention.

1 and 2, the thermal overload relay according to an embodiment of the present invention is mechanically in accordance with the heat generation assembly 100 and the heat generation assembly 100 to generate heat largely due to overcurrent It includes a switchgear assembly 200 to operate to trip a plurality of contact (Trip).

In the above-described configuration, the heating assembly 100 has a main bimetal part 110 that is curved to one side according to the temperature rise in the main body portion 130 forming the overall appearance, the upper portion of the main body portion 130 The heat is applied to the main bimetal part 110 in a state of being in contact with the free end 110a of the main bimetal part 110, and is configured as a slide part 120 which is horizontally moved to one side when a bending displacement occurs.

In addition, a heater (not shown) for winding the main bimetal part 110 and generating displacement in the main bimetal part 110 when an overcurrent occurs is preferably provided.

The switch structure assembly 200 includes an auxiliary body 210, a compensation bimetal 220, a trip unit 230, a closed contact unit 240, an open contact unit 250, a reset bar 260, and an operation display unit 270. )

Here, the auxiliary body portion 210 is installed to be fixedly coupled to the upper side of the main body portion 130 in order to reduce the size of the main body portion 110 in the horizontal direction.

Compensation bimetal 220 is installed vertically in the auxiliary body 210, the upper end is fixed to one side of the trip unit 230, the lower end of the protrusion 125 formed integrally with the slide 120 The protrusion 125 is in contact with the compensation bimetal 220 when the slide unit 120 is moved to be spaced apart by a predetermined distance on one side.

The trip part 230 is coupled to the auxiliary body part 210 so that one end thereof is rotatable about an axis, and the other end thereof is connected to support the bottom surface of one side of the first movable contact 241 to be described later.

The closed contact unit 240 and the open contact unit 250 are installed to open and close the circuit while the contact is connected or disconnected according to the operation of the trip unit 230 under the auxiliary body 210, and the closed contact unit ( 240 is composed of a first movable contactor 241 and a first fixed contactor 242 made of a normally closed state, the open contact portion 250 is a second movable contactor made of a normally open state ( 251 and a third movable contactor 252.

At this time, the first movable contact 241 is made of a leaf spring having a predetermined elastic restoring force, one end of which is the other end of the support protrusion 215 integrally protruding from the auxiliary body 210 by a predetermined angle downward. It is fixed to be inclined.

The first fixed contact 242 has an auxiliary body 210 such that the first fixed terminal 242a formed at an upper surface thereof is connected to the first movable terminal 241a formed at the bottom of the other end of the first movable contact 241. It is fixedly installed on the floor inside.

In addition, the second movable contact point 251 and the third movable contact point 252 of the open contact point 250 are installed above the first movable contact point 242, and the auxiliary body part is normally opened. It is elastically coupled within 210.

The reset bar 260 is for returning the closed contact unit 240 and the open contact unit 250 to their original positions and testing whether the operation is performed smoothly. It is installed on the upper side of the open contact part 250 so that vertical movement is possible.

The operation display unit 270 operates on / off of the closed contact unit 240 and the open contact unit 250 according to the vertical movement of the reset bar 260 and the operation of the first movable contactor 251. The test lever 271 and the auxiliary body are rotatably installed in the auxiliary body 210 to be displayed so that the state can be easily seen from the outside and rotated at a predetermined angle according to the vertical movement of the reset bar 260. The display bar 272 includes a display bar 272 that is vertically movable in the unit 210.

Here, one end of the test lever 271 is caught on the bottom surface of the locking protrusion 265 protruding integrally with the outer circumferential surface of the reset bar 260, and the other end is the locking groove 272a formed at the center of the display bar 272. It is caught on the upper side of.

One end of the display bar 272 is fixedly coupled to the other end of the first movable contactor 241 and vertically moved according to the operation of the first movable contactor 241, and the other end is external to the upper side of the auxiliary body 210. It is projected so that it can be easily seen from.

On the other hand, in the auxiliary body 210, the current adjusting unit 280 is further provided to adjust the amount of current flowing to the main bimetal part 110, that is, the set operation current value, and can be rotated on the upper side of the auxiliary body 210. The cam wheel part 281 and one side, which are installed in a fixed manner, are fixedly coupled to the trip part 230, and the trip part 230 is rotated according to the rotation of the cam wheel part 281 to compensate the gap between the compensation bimetal 220 and the slide part 120. It consists of a current adjustment lever 282 for adjusting the interval of.

In addition, a fine adjustment screw 283 for fine adjustment is screwed to the other side of the current adjustment lever 282.

Hereinafter, the operation of the thermal overload relay of the present invention having the above-described configuration will be described in detail.

First, when the current flowing in the main bimetal part 110 of the heating assembly 100 is greater than or equal to a preset current, that is, an overcurrent flows, the main bimetal part 110 may be heated by the heating of the heater wound on the main bimetal part 110. The free end 110a is bent to the left in the drawing so that the slide part 120 moves to the left in the drawing.

At this time, when the slide unit 120 is moved, the protrusion 125 of the slide unit 120 is connected to the lower free end of the compensation bimetal 220 to push the compensation bimetal 220 to the left.

As such, when the compensating bimetal 220 receives the pushing force, the trip unit 230 performs a clockwise rotational movement about the axis, and the other end of the trip unit 230 is rotated according to the rotation of the trip unit 230. As the first movable contactor 241, that is, the bottom surface of one side of the leaf spring is pressed upward, the leaf spring is bent upward.

Therefore, while the first movable terminal 241a and the first fixed terminal 242a of the closed contact unit 240 which are normally closed are separated from each other, the closed contact unit 240 is switched to the open state and at the same time the first movable contact As the ruler 241 moves upwards, the second movable contactor 251 of the open contact part 250 is pushed up, so that the second movable terminal 251a and the third movable contactor of the second movable contactor 251 are pushed up. As the third movable terminal 252a of 252 is connected, the open contact portion 250 is switched to the closed state.

At the same time, as the display rod 272 fixedly coupled to the other end of the first movable contact 241 rises upward, the other end of the display rod 272 protrudes to the upper side of the auxiliary body 210, thereby closing the contact point from the outside. The converted state of the unit 240 and the open contact unit 250 can be easily seen.

On the other hand, if you want to return the closed contact portion 240 and the open contact portion 250 converted as described above to the original state by pressing the reset bar 260 provided on the upper portion of the auxiliary body 210, reset As the bar 260 moves downward, the third movable contact point 252 of the open contact point 250 is pushed downward to return the open contact point 250 converted to the closed state to the original open state.

At the same time, the other end of the first movable contact 241 of the closed contact point 240 connected to the second movable contact point 251 of the open contact point 250 receives a downward force, and thus the predetermined elastic restoring force is applied. As a result, the first movable contactor 241 instantly returns to its original state.

In addition, the display bar 272 fixedly coupled to the other end of the first movable contact point 241 descends to return to its original state. At this time, when the reset bar 260 is released, the reset bar 260 moves upward by the elastic restoring force of the third movable contact 252 of the open contact unit 250 to return to the original state.

When the user wants to test the trip operation of the device, when the user presses the reset bar 260, the reset bar 260 moves downward while the third movable contact point 252 of the open contact part 250 is moved. By pushing downward) to connect with the second movable contactor 251, the open contact portion 250 which is normally open is converted into the closed state.

In addition, when the reset bar 260 moves downward, one end of the test lever 271 caught by the locking protrusion 265 of the reset bar 260 is pressed while rotating clockwise and at the same time, the test lever 271. The first movable contactor 241 fixedly coupled to one end of the display rod 271 is moved upwardly and separated from the first fixed contactor 242 as the display rod 272 held at the other end thereof is moved upward. The normally closed contact 240 is converted to the open state.

In this way, after confirming the operation state of the device by pressing the reset bar 260, and then release the reset bar 260, as described above, the closed contact portion 240, the open contact portion 250 and the operation display portion 270 It will return to its original state.

On the other hand, to change the setting operation current value flowing through the main bimetal part 110, if the cam wheel part 281 provided on the upper portion of the auxiliary body 210 is rotated clockwise or counterclockwise, fine adjustment screw ( The current adjusting lever 282 screwed to 283 is moved to the left or the right in the drawing.

In addition, while the trip part 230 fixedly coupled to the current adjusting lever 282 rotates in the clockwise or counterclockwise direction, the compensation bimetal 220 fixedly coupled to the trip part 230 is moved to the slide part 120. By changing the distance between the protrusion 125 of the () and the lower free end of the compensation bimetal 220, the setting operation current value flowing in the main bimetal part 110 is changed.

Further, in order to finely adjust the setting operation current value, when the fine adjustment screw 283 screwed to the current adjustment lever 282 is rotated clockwise or counterclockwise, the end of the fine adjustment screw 283 is cam. Since it rotates while supporting the outer circumferential surface of the wheel portion 281, the current adjustment lever 282 screwed to the fine adjustment screw 283 is moved to the left or right on the drawing with a predetermined displacement.

Therefore, as described above, the distance between the protrusion 125 of the slide unit 120 and the lower free end of the compensating bimetal 220 is changed to a predetermined displacement, whereby the setting operation current value flowing in the main bimetal part 110 is fine. It becomes easy to adjust.

Although the preferred embodiment of the thermal overload relay according to the present invention has been described above, the present invention is not limited thereto, and various modifications are made within the scope of the utility model registration claims and the detailed description of the invention and the accompanying drawings. It is possible to implement and this also belongs to the present invention.

According to the thermal overload relay of the present invention as described above, by installing a switch structure assembly for tripping a plurality of contact portion to the upper side of the heating assembly that generates heat by overcurrent, the overall appearance of the thermal overload relay is reduced, the switchboard There is an advantage that can be configured more compact when attached to.

In addition, the operating state of the closed / open contact portion according to the vertical movement of the reset bar and the operation of the first movable contact of the closed contact portion for testing the smooth operation and returning the closed / open contact portion to the original position of the present invention By further comprising an operation display unit for displaying, there is an advantage that the on / off operation state of the closed / open contact portion can be easily seen from the outside without using a conventional tester.

Claims (3)

A heating assembly including a main bimetal part that is curved to one side and a main body part that slides to one side according to the displacement of the main bimetal part due to the heating of the heater when an overcurrent occurs; Consists of a switch structure assembly for tripping the contact portion of, The switch structure assembly is installed on the upper side of the main body portion auxiliary body for embedding various components; A compensation bimetal installed in the auxiliary body to receive the displacement of the slide; A trip part rotatably installed in the auxiliary body part and fixed to the compensation bimetal to rotate in accordance with the movement of the slide part; A closed contact part in which the first movable / fixed contact is normally closed and an open contact part in which the second and third movable contact points are normally opened so as to be separately connected according to the rotational movement of the trip part; A reset bar installed on the upper side of the open contact part so as to be movable vertically, the reset bar for returning the closed contact part and the open contact part to its original position and performing a smooth operation; And an operation display means for displaying an operation state of the closed contact portion and the open contact portion according to the vertical movement of the reset bar and the operation of the first movable contact point. The method of claim 1, wherein the operation display means, A test lever rotatably installed in the auxiliary body part to rotate in a predetermined angle according to the vertical movement of the reset bar; One side is locked to the test lever and vertically moved according to the rotational movement of the test lever, and the end is fixedly coupled to the first movable contactor, and vertically moved according to the operation of the first movable contactor to the closed contact part. Thermal overload relay, characterized in that it comprises a display bar provided to easily view the operating state of the open contact portion from the outside. The method according to claim 1 or 2, A cam wheel part rotatably installed on an upper side of the auxiliary body part; One side is fixedly coupled to the trip part, and the trip part is rotated according to the rotation of the cam wheel part, and the fine adjustment screw is screwed to adjust the amount of current flowing to the main bimetal part by adjusting the distance between the compensation bimetal and the slide part. Thermal overload relay, characterized in that further comprises a current adjusting means made of a current adjusting lever.