KR200489834Y1 - Main contact mechanism for thermal over current relay - Google Patents

Main contact mechanism for thermal over current relay Download PDF

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Publication number
KR200489834Y1
KR200489834Y1 KR2020150008709U KR20150008709U KR200489834Y1 KR 200489834 Y1 KR200489834 Y1 KR 200489834Y1 KR 2020150008709 U KR2020150008709 U KR 2020150008709U KR 20150008709 U KR20150008709 U KR 20150008709U KR 200489834 Y1 KR200489834 Y1 KR 200489834Y1
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KR
South Korea
Prior art keywords
contact
main
thin plate
stage
movable contact
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KR2020150008709U
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Korean (ko)
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KR20170002503U (en
Inventor
조현근
Original Assignee
엘에스산전 주식회사
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Priority to KR2020150008709U priority Critical patent/KR200489834Y1/en
Publication of KR20170002503U publication Critical patent/KR20170002503U/en
Application granted granted Critical
Publication of KR200489834Y1 publication Critical patent/KR200489834Y1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H61/00—Electrothermal relays
    • H01H61/01—Details
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/12—Means for adjustment of "on" or "off" operating temperature
    • H01H37/26—Means for adjustment of "on" or "off" operating temperature by adjustment of abutment for "off" position of the movable contact
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/74—Switches in which only the opening movement or only the closing movement of a contact is effected by heating or cooling

Abstract

The present invention is to provide a main contact device of the thermal overcurrent relay of the improved configuration that can exhibit a constant contact load between the main movable contact and the main fixed contact, the main contact device of the thermal overcurrent relay according to the present invention, the circuit A main stationary contact stand connected to; A main movable contact stage having a position during normal energization contacting the main fixed contact stage and a position when an overcurrent occurs separated from the main fixed contact stage, wherein the main movable contact stage includes: a thin plate contact stage to which the contact is attached; And a terminal unit which may be connected to a circuit and connected to the thin plate contact unit and in which a portion connected to the thin plate contact unit is inclined downward.

Description

MAIN CONTACT MECHANISM FOR THERMAL OVER CURRENT RELAY}

The present invention relates to a thermal overcurrent relay, and more particularly to a main movable contact device of the thermal overcurrent relay having an improved configuration to provide a constant contact load.

Thermal overcurrent relays protect circuits and load devices (e.g. motors) from overcurrent by breaking the circuit using the bi-metal thermal deformation characteristics connected to the circuit when the overcurrent flows. It is a low voltage power device.

In general, thermal overcurrent relay (also known as thermal overload relay) forms a magnetic switch together with a magnetic contactor, which is a switch (switch) that starts or stops the motor depending on whether a control signal is applied. It is widely used for operation control and overcurrent protection.

The outer shape of the thermal overcurrent relay may refer to the thermal overcurrent relay 100 as illustrated in FIG. 1.

On the other hand with reference to Figure 2 will be described the internal configuration of the thermal overcurrent relay 100 according to the prior art.

Bimetals 10 are provided in the lower portion of the thermal overcurrent relay 100 in a number corresponding to, for example, three phases of alternating current.

The upper end of the bimetal 10 is connected to a shifter 11, and the shifter 11 is connected to a circuit so that it is horizontally deformed by the pressing force of the upper end of the bimetal 10, which is thermally deformed and bent during overcurrent energization. Move (move right to drawing).

Accordingly, the shifter lever 11a connected to the shifter 11 also moves horizontally (moves in the right direction on the drawing) by the shifter 11 moving horizontally.

The lower end of the power transmission plate 12 is located in the movement path of the shifter lever 11a, and the upper end of the power transmission plate 12 is rotatable with an auxiliary lever rotatable about an axis fixed inside the thermal overcurrent relay 100 ( 13).

The auxiliary lever 13 is a crank-shaped member and has a pointed shape so that the lower auxiliary auxiliary contact 14 can be pressed (see the lower portion 13 of FIG. 6). The upper end of the auxiliary lever 13 is pivotally supported by the shaft.

The auxiliary movable contact 14 is one end of the short thin plate contact arm and a long thin plate contact arm longer than the short thin plate contact arm. It is configured by overlapping and fixing.

A spring 15 is provided at the other end portions of the thin plate contact stage of the auxiliary movable contact 14 and the thin plate contact stage.

The end of the sheet contact point of the auxiliary movable contact 14 is sandwiched between the pinching protrusions 17a and 17b of the auxiliary holder 17 so that the sheet contact point of the auxiliary movable contact 14 During movement, power is transmitted by the gripping protrusions 17a and 17b so that the auxiliary holder 17 also moves in the same direction as the moving direction of the sheet contact point of the auxiliary movable contact 14.

On the upper portion of the auxiliary movable contact 14 facing the contact portion, the auxiliary fixed contact 16 is installed to be fixed in position.

The auxiliary movable contact 14 and the auxiliary fixed contact 16 are connected to the auxiliary movable contact 14 and the auxiliary movable contact 14 to indicate whether the contact position of the thermal overcurrent relay 100 is a normal energized position or an overcurrent trip position. A power source separate from the power source connected to the fixed contact 16, for example, a direct current power source, and a display or communication means such as a display lamp, a display, a buzzer, and a communication unit may be connected.

In the upper part of the auxiliary holder 17, whether the position of the auxiliary movable contact 14, that is, the contact position of the thermal overcurrent relay 100, is the normal energizing position or the overcurrent trip position, The display lever 20 which moves downward and displays is connected.

The display lever 20 includes a body portion extending in a vertical direction, a power receiving portion formed to extend from one side of the body portion to one side (left side in the drawing) and connected to the auxiliary holder 17, and a lower end of the body portion. And a guide button portion 20a protruding in the front-back direction, and a display button portion 20b protruding on the outer top surface of the thermal overcurrent relay 100 for displaying the contact position.

 Position fixing of the guide link 21 having the elongated hole formed in the vertical direction to guide and restrict the vertical movement of the display lever 20 through a long hole portion connected with the guide protrusion 20a. It is prepared.

In the lower part of the auxiliary holder 17, the main contact operation protrusion 17c is provided to protrude toward the main movable contact 18 (to the right in the drawing).

The main movable contact 18 is provided so that the lower part of one end contacts the main contact operation protrusion 17c, and the main fixed contact 19 is provided at the lower part facing the main movable contact 18 in the vertical direction.

The main movable contact 18 and the main fixed contact 19 are provided as contacts for opening and closing a power supply circuit between a power supply and a load device (for example, an electric motor).

The operation of the thermal overcurrent relay 100 according to the prior art configured as described above will be briefly described with reference to FIGS. 1 to 3 (particularly with reference to FIG. 2).

In FIG. 2, when an overcurrent flows in the circuit, the bimetal 10 is thermally deformed and bent to the right in the drawing.

Then, the shifter 11 moves to the horizontal direction, in particular, to the right side in FIG. 2 due to the pressing force caused by the movement of the bimetal 10 that is bent to the right.

As the shifter 11 moves horizontally to the right, the shifter lever 11a connected to the shifter 11 also moves horizontally (moves in the right direction on the drawing).

Then, the auxiliary lever 13 coupled to the power transmission plate 12 while the lower end of the power transmission plate 12 pressed by the upper end of the shifter lever 11a horizontally moving in the right direction rotates in a counterclockwise direction. ) Also rotate counterclockwise.

Accordingly, the lower end (see the lower end of reference numeral 13 in FIG. 6) having the pointed shape of the auxiliary lever 13 pushes the auxiliary movable contact 14 downward.

Since the thin plate portion of the auxiliary movable contact 14 is constituted by a kind of leaf spring, the thin plate portion of the auxiliary movable contact 14 is in contact with the corresponding auxiliary fixed contact 16 while being inverted by the pressing to raise the contact portion.

At this time, the auxiliary holder 17 coupled to the rising contact portion of the auxiliary movable contact 14 is pushed upward, and accordingly, the main movable contact 18 coupled to the main contact operation protrusion 17c of the auxiliary holder 17. ) Is separated from the main fixed contact 19 as it rises, so that the power supply circuit between the power supply side and the load (motor) is cut off to protect the load from overcurrent.

In addition, the display lever 20 having one side connected to the auxiliary holder 17 also rises together with the auxiliary holder 17, and thus the display button part 20b of the display lever 20 is raised to visually indicate that the current is in the overcurrent trip state. Will be displayed.

Closing between displays or communication means such as power or display lamps, displays, buzzers, communication units or communication means by auxiliary movable contacts 14 and auxiliary fixed contacts 16 contacted simultaneously. As the circuit is formed, the corresponding display or communication means operates to electrically indicate / communicate that a current overcurrent trip condition has occurred.

For a description of a more detailed configuration and operation of the thermal overcurrent relay according to the prior art as described above can refer to the following patent documents granted to the applicant of the present application.

(Patent Document 1) KR10-0689321 B1

On the other hand, in the thermal overcurrent relay according to the related art, which is constructed and operated as described above, the detailed configuration of the main movable contact 18 is configured as the main movable contact assembly as shown in FIG.

The main movable contact assembly is configured to include a thin plate contact stage, a terminal portion 18b, and a contact 18c.

The thin plate contact stage is bent and extended at a predetermined angle from the first thin plate contact portion 18a2 and the first thin plate contact portion 18a2 connected to the terminal portion 18b by a rivet or the like. The contact 18c is included, and the contact 18c is coupled to the end side of the second contact sheet 18a1 connected to the auxiliary holder 17 in FIG. 2.

The purpose of bending the second thin plate contact portion 18a1 at a predetermined angle from the first thin plate contact portion 18a2 is the main movable contact 18 and the main fixed contact 19, which are normal closed contacts. This is to maintain the contact state under a constant load during normal energization.

However, in order to obtain a desired contact load, the main movable contact assembly according to the prior art has to be manufactured in a state where the sheet contact stage is bent at a predetermined angle, so that the sheet contact is very thin for each thermal overcurrent relay in manufacturing. Since it is not easy to produce a constant bending angle of the stand, it was difficult to secure the energization reliability between the main movable contact and the main fixed contact.

Therefore, the present invention solves the problems of the prior art described above, and an object of the present invention is to provide a main contact device of a thermal overcurrent relay having an improved configuration capable of exerting a constant contact load between a main movable contact and a main fixed contact. It is.

Another object of the present invention is to provide a main contact device of a thermal overcurrent relay capable of exhibiting a constant contact load between a main movable contact and a main fixed contact while improving productivity of the main fixed contact.

One object of the present invention, in the main contact device of the thermal overcurrent relay,

Main fixed contact stand connected to the circuit;

A main movable contact stage having a position at normal energization contacting the main fixed contact stage and a position at the time of occurrence of an overcurrent separated from the main fixed contact stage,

The main movable contact stand,

Thin plate contact stand for attaching contacts; And

The thermal over-current relay according to the present invention, characterized in that it comprises a terminal portion which can be connected to the circuit, connected to the thin contact point, the portion connected to the thin contact point is inclined downward Can be achieved by providing a primary contact device.

Another object of the present invention, the terminal portion has a thickness thicker than the thin plate contact stage, the main fixed contact stage is a thermal overcurrent according to the present invention, characterized in that the thickness of the portion attached to the terminal portion and the contact is the same This can be achieved by providing a main contact device of the relay.

According to a preferred aspect of the present invention, the thin plate contact stage is composed of a flat conductive sheet.

The main contact device of the thermal overcurrent relay according to the present invention is a thin plate contact stage to which the main movable contact unit attaches a contact point, and a portion connected to the thin plate contact unit and connected to the thin plate contact unit is inclined downwardly Since it is configured to include a terminal portion, it is possible to provide the effect of maintaining a constant contact load between the main movable contact and the main fixed contact without the need to bend the thin plate contact stage.

Since the main contact device of the thermal overcurrent relay according to the present invention has a thickness thicker than that of the thin plate contact terminal with the terminal, and the main fixed contact stage has the same thickness as the terminal part and the part to which the contact is attached, The thickness of the part where the terminal part and the contact part are attached can be integrally formed in the same way as the terminal part, so that the process of connecting the terminal part and the contact part with rivets is unnecessary, thereby improving productivity and extending the life of the main fixed contact stand. Can provide a beneficial effect.

According to a preferred aspect of the present invention, since the thin plate contact stage is composed of a flat conductive plate, it is possible to produce a constant contact contact load without having to bend all of the thin plate contact stages at a constant bending angle during mass production of the relay. There is an effect that can be obtained.

1 is an external perspective view showing the external configuration of a thermal overcurrent relay to which the prior art or the technology of the present invention can be applied;
Figure 2 is a longitudinal cross-sectional view of a thermal overcurrent relay showing the internal configuration of the thermal overcurrent relay to which the prior art or the technology of the present invention can be applied,
3 is a side view showing the configuration of the main movable contact assembly of the thermal overcurrent relay according to the prior art,
Figure 4 is a side view showing the configuration of the main movable contact assembly of the thermal overcurrent relay according to an embodiment of the present invention,
5 is a perspective view obliquely looking down from the top of the main movable contact assembly of the thermal overcurrent relay according to an embodiment of the present invention;
6 is a partial longitudinal cross-sectional view of a thermal overcurrent relay showing a thermal overcurrent relay to which a main movable contact assembly is applied according to a preferred embodiment of the present invention;
7 is a perspective view showing the configuration of the main fixed contact assembly of the main contact device according to the prior art,
8 is a perspective view showing the configuration of the main fixed contact assembly of the main contact device according to an embodiment of the present invention.

The purpose of the present invention and the constitution and effect of the present invention to achieve the same will be more clearly understood by the following description of the preferred embodiment of the present invention with reference to the accompanying drawings.

In the present invention, the configuration of the thermal overcurrent relay excluding the main contact device, that is, the main movable contact and the main fixed contact, is the same as that of the thermal overcurrent relay described above with reference to FIG. 2. In order to avoid the description will be omitted.

4 to 6 will be described the configuration of the main movable contact assembly of the thermal over-current relay according to a preferred embodiment of the present invention.

The main movable contact assembly of the thermal overcurrent relay according to the preferred embodiment of the present invention is for a thermal overcurrent relay having a main fixed contact stage (see reference numeral 16 in FIG. 6) connected to a circuit, ).

The main movable contact stage 18 has a position at normal energization contacting the main fixed contact stage 16 and a position at the time of occurrence of an overcurrent separated from the main fixed contact stage 16.

The main movable contact stage 18 includes a thin plate contact stage 18a and a terminal portion 18b.

The thin contact plate 18a is a portion attaching the contact 18c and may be made of a thin metal plate having conductivity.

According to a preferred aspect of the present invention, the thin plate contact stage 18a is constituted by a flat conductive plate without a bent portion.

The terminal portion 18b can be connected to a circuit between the power supply and the load and is connected to the thin plate contact stage 18a.

The terminal portion 18b has a thickness thicker than that of the thin plate contact stage 18a, and the thin plate connecting portion 18b1, which is a portion that is connected to the thin plate contact stage 18a, is best seen in FIG. 4 below. Inclined to form.

Since the thin contact plate 18a is formed of a thin metal plate, it is difficult to manufacture by molding, and since the thin plate contact plate 18a is formed of a plate-shaped conductive plate without any bending parts, it is possible to mass-produce by pressing. Do.

On the other hand, the thin plate contact stage according to the prior art has a bending process for forming the first thin plate contact portion 18a2 and the second thin plate contact portion 18a1 by bending at a predetermined angle by manual operation using a special machine or tool. It has to be added and it is very difficult to mold a large number of sheet contact strips according to the prior art at constant bending angles.

In addition, since the terminal portion 18b according to the present invention has a thickness that is thicker than the thin plate contact stage 18a, even if the thin plate connecting portion 18b1 has a configuration in which it is inclined downward at a predetermined angle, for example, molding This allows mass production with a constant downward tilt angle.

Meanwhile, the configuration of the main contact device according to the preferred embodiment of the present invention in the main contact device (main contact mechanism) and the main contact device according to the preferred embodiment of the present invention with reference to FIGS.

The configuration of the main movable contact stand in the main contact device according to the preferred embodiment of the present invention shown in Figures 6 and 8 is as described above with reference to Figure 4 mainly.

That is, the main contact device according to a preferred embodiment of the present invention has a position at normal energization contacting the main fixed contact stage 19 and a position at the time of overcurrent separated from the main fixed contact stage 19 as described above. A main movable contact stage 18.

The main movable contact stage 18 includes a thin plate contact stage 18a to which the contact 18c is attached and a terminal portion 18b.

The terminal portion 18b may be connected to a circuit and is connected to the thin plate contact stage 18a and has a thickness thicker than the thin plate contact stage 18a.

Moreover, the terminal part 18b is a site | part connected with the said thin plate contact stand, and the thin plate connection part 18b1 is inclined downward.

The thin plate contact stage 18a is constituted by a flat conductive plate having no bent portion.

Meanwhile, the configuration of the main fixed contact stand according to the prior art according to FIG. 7 will be described to be comparable with the main fixed contact stand according to the present invention.

As can be seen in Fig. 7, the main fixed contact stage 19 according to the prior art is configured to include a thin plate contact stage 19a, a terminal portion 19b and a contact 19c.

The sheet contact stage 19a and the terminal portion 19b may be connected to each other by rivets (unsigned).

Main fixed contact stand according to a preferred embodiment of the present invention is configured as can refer to FIG.

In other words, the main fixed contact table 19 includes a contact portion 19a-1 and a terminal portion 19b.

According to a preferred aspect of the present invention, the thickness of the contact portion 19a-1, which is a portion to which the terminal portion 19b is attached, is the same.

When manufacturing the main fixed contact stage 19, the thickness of the portion where the terminal portion 19b and the contact portion 19c are attached, that is, the contact portion 19a-1, can be integrally formed, and accordingly, the terminal portion 19b and the contact portion Since the process of riveting the portions 19a-1 is unnecessary, productivity is improved, and the life of the main fixed contact stage 19 can be extended compared to the prior art having the thin plate contact stage 19a. Can provide.

The operation of the thermal overcurrent relay including the main contact device or the main movable contact assembly configured as described above will be described with reference to FIG.

When an overcurrent flows in the circuit, the bimetal (see reference numeral 10 in FIG. 2) is thermally deformed and bent to the right in the drawing.

Then, the shifter lever 11a connected to the shifter 11 also moves horizontally (right side in the drawing) according to the right horizontal movement of the shifter (see reference numeral 11 in FIG. 2) due to the pressing force according to the movement of the bimetal bent to the right. Direction).

Then, the auxiliary lever 13 coupled to the power transmission plate 12 while the lower end of the power transmission plate 12 pressed by the upper end of the shifter lever 11a horizontally moving in the right direction rotates counterclockwise. ) Also rotate counterclockwise.

In response to this, the lower end of the auxiliary lever 13 having a pointed shape, the auxiliary movable contact 14 is pressed downward.

Since the thin plate portion of the auxiliary movable contact 14 is constituted by a kind of leaf spring, the thin plate portion of the auxiliary movable contact 14 is in contact with the corresponding auxiliary fixed contact 16 while being inverted by the pressing to raise the contact portion.

At this time, the auxiliary holder 17 coupled to the ascending contact portion of the auxiliary movable contact 14 is pushed upward, whereby the main movable contact 18 in contact with the main contact operation protrusion 17c of the auxiliary holder 17. ) Is separated from the main fixed contact 19 as it rises, so that the power supply circuit between the power supply side and the load (motor) is cut off to protect the load from overcurrent.

As described above, the main movable contact assembly of the thermal overcurrent relay according to the present invention has a thin plate contact stage 18a to which the main movable contact stage 18 attaches a contact, and has a thickness thicker than that of the thin plate contact stage. Since the portion connected to the thin plate contact stage, that is, the thin plate connecting portion 18b1 includes a terminal portion 18b which is inclined downward, it is not necessary to bend the thin plate contact stage 18a. It is possible to provide an effect of maintaining a constant contact load between the movable contact 18 and the main stationary contact 19.

10: bimetal 11: shifter
12: power transmission plate 13: auxiliary lever
14: auxiliary movable contact 15: spring
16: auxiliary fixed contact 17: auxiliary holder
17a, 17b: pincer stone part
17c: main contact operation part 18: main movable contact
18a: thin plate contact
18a1: 2nd thin plate contact loan 18a2: 1st thin plate contact loan
18b: terminal section 18b1: thin plate connection
18c: contact
19: main fixed contact 19a: thin plate contact
19a-1: contact section
19b: terminal section 19c: contact

Claims (3)

In the main contact device of the thermal overcurrent relay,
Main fixed contact stand connected to the circuit;
A main movable contact stage having a position at normal energization contacting the main fixed contact stage and a position at the time of occurrence of an overcurrent separated from the main fixed contact stage,
The main movable contact stand,
Thin plate contact stand for attaching contacts; And
And a thin plate connecting portion to which the thin plate contact stage is connected, the terminal portion being connected to the circuit.
The thin plate contact stage extends in a straight line from one end portion in the longitudinal direction to the other end portion opposite to the one end portion in the longitudinal direction, and is formed in a flat plate shape having a rectangular cross section in the longitudinal direction,
The thin plate connecting portion is inclined downward at a predetermined angle,
When the thin plate contact stage is connected to the thin plate connecting portion, the thin plate contact stage is disposed to be inclined downward at the predetermined angle,
And the terminal portion has a thickness thicker than the thin contact point. The method of claim 1,
The thin plate contact stage is a main contact device of a thermal overcurrent relay, characterized in that consisting of a thin plate-like conductive material. The method of claim 1,
The main fixed contact unit is the main contact device of the thermal over-current relay, characterized in that the thickness of the terminal portion and the portion to which the contact is attached.
KR2020150008709U 2015-12-31 2015-12-31 Main contact mechanism for thermal over current relay KR200489834Y1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR2020150008709U KR200489834Y1 (en) 2015-12-31 2015-12-31 Main contact mechanism for thermal over current relay

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR2020150008709U KR200489834Y1 (en) 2015-12-31 2015-12-31 Main contact mechanism for thermal over current relay

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KR200489834Y1 true KR200489834Y1 (en) 2019-08-19

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200386836Y1 (en) * 2005-03-21 2005-06-16 엘에스산전 주식회사 A Thermal Overload Relay

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200208216Y1 (en) * 1998-08-21 2001-01-15 이종수 Combined structure of thermal overload relay terminal block
KR100689321B1 (en) * 2005-05-13 2007-03-08 엘에스산전 주식회사 Thermal overload relay
KR101052715B1 (en) * 2009-12-28 2011-07-29 주식회사 대륙 Thermal Overload Relay

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR200386836Y1 (en) * 2005-03-21 2005-06-16 엘에스산전 주식회사 A Thermal Overload Relay

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