KR100784139B1 - Protector of Over Load And Plug And Multi-tab Using The Same - Google Patents

Abstract

The present invention relates to an overload protector for blocking an overcurrent by adding an overload detection function to a power plug and a plug using the same. A bimetal having a conductive plate having a fixed contact formed on one surface and a movable contact formed at one end thereof in contact with the fixed contact is provided. And a stopper for limiting movement of the rear surface of the movable contact at a position opposite to the movable contact of the bimetal and a fixing part to which the other end of the bimetal is fixed, electrically insulated from the conductive plate. And an adjusting part positioned between the fixing part formed on the can and the stopper to press the bimetal by a predetermined displacement toward the fixed contact point, wherein the conductive plate has a first insulation attached to a lower surface thereof. Is insulated by a member, and the can is provided with a second insulating member to the conductive plate. It provides an overload protector and being attached.

Overload, temperature, plug

Description

Protector of Over Load And Plug And Multi-tab Using The Same}

1 is a cross-sectional view for explaining a first conventional example of an overload protector.

2 is a cross-sectional view for explaining a second conventional example of an overload protector.

3 is a cross-sectional view for explaining a first conventional example of a plug with a built-in overload protector.

4 is a cross-sectional view for explaining a second conventional example of a plug with a built-in overload protector.

5 is a cross-sectional view for explaining a third conventional example of an overload protector.

6 is a cross-sectional view for explaining a fourth conventional example of the overload protector.

7 is a cross-sectional view for explaining the structure of the first embodiment of the overload protector according to the present invention.

8 is a plan view for explaining the structure of the first embodiment of the overload protector according to the present invention.

9 is a cross-sectional view for explaining the structure of the second embodiment of the overload protector according to the present invention.

10 is a cross-sectional view for explaining the structure of the plug for overload protection according to the present invention.

11 is a configuration diagram for explaining the overload protection multi-tap according to the present invention.

Explanation of symbols on the main parts of the drawings

50: housing 52: code

54a, 54b: plug pin 60: overload protector

100: plug 110: multi-tap

The present invention relates to an overload protector, a plug and a power tap using the same, and more particularly, to an overload protector for blocking an overcurrent by adding an overload detection function to the power plug and a plug and a power tap using the same.

In general, when an electric device using electricity as a power source is normally operated, a current within the set range is supplied and safe. However, when an overcurrent is supplied due to an abnormality of the electric device, the electric device may be damaged, and the fire may be caused by overheating. There is a risk of occurrence.

In order to solve this problem, Utility Model Registration No. 20-296482, published on November 23, 2002, discloses an overload protector with a sealed structure.

As shown in FIG. 1, the overload protector of the sealing structure includes a cylindrical can member 14 having an external connection terminal 19 and a built-in bimetal member 16 in a connected state, and another external connection terminal 12. And an insulating gasket which is assembled between the can member 14 and the conductive plate 10 through the bimetal member 16 and is assembled between the can member 14 and the conductive plate 10. 13).

In FIG. 1, FIG. 1A illustrates a state in which the bimetal member 16 is not operated and is electrically connected. FIG. 1B illustrates a state in which the bimetal member 16 is electrically blocked. It is shown.

The bimetal member 16 is movable that can be selectively connected to a contact 11 of the conductive plate 10 via a fixed contact 15 fixed to the can member 14 and the insulating gasket 13. A contact portion 18, the tubular body of the can member 14 for connection with the bimetal member 16, a projecting contact portion 14a fixedly connected to the fixed contact portion 15, and the movable contact portion 18. The other protruding contact portion 14b to which the rear surface of the back contact is formed.

Here, the other protruding contact portion 14b has a stopper function to limit the upward position of the bimetal member 16.

An overload protection device is disclosed in Korean Patent Publication No. 10-2005-95037 published on September 29, 2005.

The overload protection device is formed by the base plate 29, the cover housing 27 on the base plate 29, the base plate 29 and the cover housing 27, as shown in FIG. Bimetal disk 23 for electrically detachable contact between the first and second connection terminals 20 and 21 and the first and second connection terminals 20 and 21 accommodated in an inner space and spaced apart from each other. ) And a reinforcing plate 28 is added to the bottom of the cover housing 27 in preparation for external impact.

One end 23b of the bimetal disc 23 is fixed to one end of the second connection terminal 21, and the other end 23a is in contact with one end of the first connection terminal 20. Formed.

In addition, although a recess 28 is formed to protrude downward in the reinforcing plate 28, the recess 28a only has a stopper function for limiting the upward position of the bimetal disc 23. As shown in FIG. .

On the other hand, by using the plug with the built-in overload protector having the above function is used for the purpose of blocking the overcurrent without additional connection.

An example of this is disclosed as a power plug in Patent Publication No. 10-2003-96543, published December 31, 2003.

As shown in FIG. 3, the power plug includes a cord 32 to which power is applied, a connecting pin 31 connected to the cord 32 and inserted into an outlet, and the cord 32 and the connecting pin ( 31 is composed of a blocking unit 33 connected to any one of the cord 32 in the body 30 is mounted.

The blocking unit 33 is composed of a housing 34 and a bimetal 35 installed inside the housing 34 to control the cord 32. When an overcurrent flows through the cord 32, The bimetal 35 is deformed to block the connection of the cord 32.

In addition, Japanese Patent Laid-Open No. 1998-326646 published on December 8, 1998 discloses a power plug having a blocking function.

As shown in FIG. 4, the power plug to which the blocking function is added has an insulating case in which a connection pin 41 inserted into an outlet is mounted on one side, and a cord 42 connected to the connection pin 41 is inserted in the other side. A blocking portion 43 connected between the one cord 42 and the contact pin 41 is formed inside the 40.

The blocking part 43 includes a metal case 45 having one end of the cord 42 connected to one side thereof, a bimetal 46 having one end fixed to the inside of the metal case 45, and any one of the cords 42. Movable contact 46a which is formed at the other end of the conductive plate 44 connected to one end of the connecting pin 41 and the fixed contact 44a formed at one end of the conductive plate 44. ), An insulating part 48 inserted between the metal case 43 and the conductive plate 44 to electrically insulate, and an insulating plate 47 sealing the lower end of the metal case.

Conventional overload protector or circuit breaker made as described above, as shown in Figures 1 to 4, is connected to the power line of the electrical equipment, or connected to one end of the power line (cord) of the power plug and plug pin (inserted in the outlet) Pins are connected), and when an overcurrent flows into the cord, the bimetal is overheated to deform the shape, and has a function of releasing the electrical contact state by releasing the shape to cut off the power supply.

By the way, the power consumption of the conventional electric equipment is set differently according to the type.

Therefore, the overcurrent protector or breaker has a problem in that the productivity is lowered because the overcurrent protector or the breaker must be set and applied according to the power consumption VA of each electric device to which it is applied.

That is, since the operating temperature of the bimetal has to be set for each electric device and manufactured, there is a problem in that productivity is reduced due to the production of multiple products.

To solve this problem, two thermally active snap switches are introduced in the publication of Patent Publication No. 10-1990-2617.

As an example of the thermally actuated snap switch, as shown in FIG. 5, the container 95 is coupled to one side of the switch body 94b by the insulating filler 94c holding the conductive member 94a fixed in the hole. By forming a housing, the fixed contact 91 to which the contact material 91a is attached is fixed to the lower end of the conductive member 94a installed in the switch housing, and a long hole is drilled in the upper portion of the inner surface of the switch body 94b. The left end 92a of the support 92 having the support portion 92c to which the connecting piece 90c is attached is fixed, but an elastic piece 93 is formed in which a hole is formed between the left bottom portion of the support 92 and the connecting piece 90c. ) And the right end of the heat deflection plate 90 having the movable contact 90a installed on the contact material portion 91a of the fixed contact 91 and having the curved portion 90b installed on the bottom of the support 92. Is fixed to the connecting piece 90c and heats through the long hole of the support body 92 and the hole 93a of the elastic piece 90. The curved portion (90b) of the template (90) comprises a threaded portion (92b) for adjusting the elastic force is bent due to the heat.

Another example of the thermally actuated snap switch has a structure similar to that of FIG. 5, as shown in FIG. 6 (denoted by the same reference numeral), and instead of the screw portion 92b shown in FIG. A part of the support body 96 attached to the base body 94b through the left end 96a is pressed to form a support portion 96b so that the curved portion 90b of the heat deflection plate 90 is bent by heat to adjust the elastic force. It was.

Conventional thermal snap switch as described above of the thermal deformation plate 90 by using a screw (92b in Figure 5) or the support portion (96b in Figure 6) to set the operating temperature of the bimetal thermal deformation plate 90. It has a structure which pushes the curved part 90b.

By the way, the conventional thermally actuated snap switch comprised as mentioned above welds and fixes the container 95 to the switch base 94b in the state which previously set the screw 92b or the support part 96b to the support bodies 92 and 96. Therefore, after completion of the product has a problem that can not set the operating temperature.

In other words, the conventional thermal snap switch has a problem that the product must be produced in a variety of varieties according to the device to be applied because the set temperature cannot be changed because the product is sealed by the container 30 when the assembly is completed. It is.

An object of the present invention is to make it easy to set the operating point of the over-current circuit breaker operating in a bimetal way to manufacture one type of over-current circuit breaker, and then to operate the overload protector that can be applied to a plurality of electrical devices, each of which is different in power consumption with a simple operation. To provide.

In addition, the present invention provides a plug and a power tap using an overload protector that can easily set an overload cut-off condition on the power plug.

In order to achieve the above object, the present invention provides a conductive plate having a fixed contact formed on one surface thereof, a bimetal formed at one end of a movable contact contacting the fixed contact, and a fixing part at which the other end of the bimetal is fixed and the bimetal. A stopper for limiting the movement of the rear surface of the movable contact is formed at an opposite position of the movable contact, the can is made of a conductive material of a can structure and is electrically insulated and coupled to the conductive plate, and the fixing part formed on the can and the stopper An adjustment unit positioned between and pressurizing the bimetal by a predetermined displacement toward the fixed contact point, wherein the conductive plate is insulated by a first insulating member attached to a lower surface, and the can is second to the conductive plate. An overload protector is provided having an insulating member attached thereto.

In addition, the present invention provides a power plug including at least two cords and plug pins, each of which includes a conductive plate having a fixed contact formed on one surface thereof and connected to any one cord and any one plug pin of the power plug; A bimetal having one end of the movable contact in contact with the fixed contact; A stopper for restricting movement of the rear surface of the movable contact is formed at an opposite position between the fixed part to which the other end of the bimetal is fixed and the movable contact of the bimetal, and is electrically insulated from the conductive plate made of a conductive material having a can structure. A can coupled to one side of which is connected to the other of the cord and one of the plug pins; And an adjustment part positioned between the fixing part formed in the can and the stopper to press the bimetal by a predetermined displacement toward the fixing contact point.

In addition, the present invention provides a power tap connected to a power cord, comprising: at least one tab into which a plug of another electric device is inserted; A fixed contact formed on one surface of the conductive plate and connected to one of the power cord and one end of the tab; A bimetal having one end of the movable contact in contact with the fixed contact; A stopper for restricting movement of the rear surface of the movable contact is formed at an opposite position between the fixed part to which the other end of the bimetal is fixed and the movable contact of the bimetal, and is electrically insulated from the conductive plate made of a conductive material having a can structure. A can coupled to one of the power cord and the other of one end of the tab; And an adjusting part positioned between the fixing part formed on the can and the stopper to press the bimetal by a predetermined displacement toward the fixing contact point.

And a switch connected between the tab and the power cord.

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The position of the adjustment portion is characterized in that the position within 1/2 of the fixing portion between the fixing portion and the stopper.

The position of the adjusting portion is characterized in that the position within 1/4 of the fixing portion between the fixing portion and the stopper.

The adjusting unit is characterized in that the protrusion is formed in a predetermined depth to the can.

The adjusting portion is characterized in that formed by the punch.

The adjusting unit has a predetermined length, characterized in that the projection coupled to the can.

The protrusion is characterized in that the length can be varied.

The protrusion is a bolt that forms a nut in the can and is coupled to the nut.

(Example)

An overload protector according to the present invention, a plug and a tap using the same, will be described in detail with reference to the accompanying drawings showing a preferred embodiment of the present invention.

7 is a cross-sectional view illustrating the structure of the first embodiment of the overload protector according to the present invention, FIG. 8 is a plan view illustrating the structure of the first embodiment of the overload protector according to the present invention, and FIG. Sectional view for explaining the structure of the second overload protector according to the second embodiment, Figure 10 is a cross-sectional view for explaining the structure of the overload protection plug according to the invention, Figure 11 is a configuration diagram for explaining the overload protection multi-tap according to the present invention.

1. First embodiment of overload protector (see Fig. 7)

As shown in FIGS. 7 and 8, the first embodiment of the overload protector according to the present invention includes a conductive plate 61 having a fixed contact 62 formed on one surface thereof and a first connecting end 61 a formed on one side thereof; A bimetal 66 having a movable contact 68 contacting the fixed contact 62 formed on the conductive plate 61 at one end thereof, and a can structure made of a conductive material, and the other end of the bimetal 66 is formed. The can 64 is fixed to one side of the inner surface and the second connecting end 64a is formed on one side, the first insulating plate 71 attached to the lower surface of the conductive plate 61, the can 64 and A second insulating plate 72 attached to a contact portion between the conductive plates 61 to electrically insulate, a base 70 attached to a lower surface of the first insulating plate 71, and the bimetal 66 Protruding downwardly into the can 64 toward the direction of (1) to press the middle portion of the bimetal 66 by a predetermined displacement. It consists of the adjustment element (64d).

The can 64 is provided with a fixing portion 64b on which one fixed end 67 formed at the other end of the bimetal 66 is fixed, and at the position opposite to the movable contact 68, the movable contact ( When 68 is separated from the fixed contact 62, a stopper 64c is provided to limit the movement of the rear surface of the movable contact 68. As shown in FIG.

The adjusting portion 64d is formed at a position adjacent to the fixing portion 64b.

In other words, the adjusting portion 64d is preferably formed at a position within 1/2 of the fixing portion 64b between the fixing portion 64b and the stopper 64c, more preferably 1/4. It is preferable to be formed in a position within.

The reason for doing this is that when the position of the adjustment unit 64d is formed at the position biased toward the stopper 64c, it does not play an adjustment role for setting the operation by acting as the stopper 64c.

Here, the adjustment unit 64d is formed in a conical shape having a preset diameter and depth at a predetermined position using a separate punch in a state made with all of the above components.

At this time, the diameter and depth of the cone forming the adjustment unit 64d is set in consideration of the operating temperature of the bimetal 66 with reference to the power consumption VA of the electric device used based on the data according to the repeated test. do.

2. Second embodiment of overload protector (see Fig. 9)

As shown in FIG. 9, the second embodiment of the overload protector according to the present invention includes a conductive plate 88 having a fixed contact 89 formed on one surface thereof, and a fixed contact 89 formed on the conductive plate 88. A bimetal 85 having a movable contact 87 contacted at one end thereof, a can structure made of a conductive material, and a can 81 having the other end of the bimetal 85 fixed to an inner side thereof; and the can 81 ) And a first insulating plate 83a attached and electrically insulated between the conductive plate 88, a second insulating plate 83b attached to a lower surface of the conductive plate 88, and the second insulating plate ( 83b) and the base 84 is attached to the lower surface, and the adjusting portion 82 is screwed to the can 81 to adjust the depth of the bimetal 85 by pressing the intermediate portion of the bimetal 85 by the screwed displacement It is composed of

The can 81 is provided with a fixing portion 81a on which one fixed end 86 formed at the other end of the bimetal 85 is fixed, and at the position opposite to the movable contact 87, the movable contact ( When 87 is separated from the fixed contact 89, a stopper 81b is provided which restricts the movement of the rear surface of the movable contact 87. As shown in FIG.

The adjusting unit 82 may be formed of a protrusion having a predetermined length in addition to the bolt, and the coupling depth of the bolts constituting the adjusting unit 82 may be used based on the data according to the repetitive test. VA) and the operating temperature are set in consideration, and in some cases, the user may arbitrarily change and reset.

In addition, the adjusting part 82 is preferably formed at a position within 1/2 of the fixing part 81a between the fixing part 81a and the stopper 81b, and more preferably within 1/4. It is preferably formed at the position of.

The reason for doing this is that when the position of the adjusting unit 82 is formed at a position biased toward the stopper 81b, the adjusting unit 82 does not play an adjustment role for setting the operation by acting as the stopper 81b.

3. Manufacturing process of overload protector

The manufacturing process of the overload protector 60 which concerns on this invention is demonstrated.

First, the first insulating plate 71 and the second insulating plate 72 are attached to both surfaces of the conductive plate 61 having the first connection terminal 61a formed at one side thereof.

In this case, the second insulating plate 72 should be formed in a state in which a portion where the fixed contact 62 formed on the conductive plate 61 is formed is excluded.

The base 70 is attached to the lower surface of the first insulating plate 71.

In addition, the can 64 made of a metal can structure and having a second connection end 64a formed on one side thereof is formed by a press method. In this case, the can 66 includes a fixing part 64b and a stopper 64c. It should be formed together.

The can 66 is attached to the fixing end 67 of the bimetal 66 having the movable contact 68 formed on the fixing part 64b formed on the can 64, and to which the bimetal 66 is attached. Is attached on the second insulating plate 72 to which the first insulating plate 71, the conductive plate 61, and the base 70 are attached.

Subsequently, the adjustment unit 64d is formed at a preset position (see the first and second embodiments) of the can 64 by using a punch.

Here, the adjusting portion 64d may be formed before assembling the can 64.

4. Plug for overload protection (see FIG. 10)

The overload protection plug 100 according to the present invention uses the overload protectors 60 and 80 shown in the first and second embodiments in the housing 50 of the plug 100 to be used as a power cord of an electric device. Will be.

That is, as shown in FIG. 10, the plug 100 according to the present invention includes a plug pin 54a and 54b fixed to one side of the housing 50 and a cord connected to the plug pins 54a and 54b. 52, an overload protector 60 accommodated in the housing 50 and connected between a first plug pin 54a among the plug pins 54a and 54b and a first cord 52a among the cords 52. It consists of

At this time, the second plug pin 54b and the second cord 52b are directly connected to each other in the housing 50.

The plug 100 according to the present invention has an overload protector 60 or 80 having an operating temperature of the bimetals 66 and 85 set in advance by the adjusting units 64d and 85 according to the power consumption of the connected electric device. ), The appropriate overload protectors 60 and 80 may be selected and manufactured according to the power consumption specifications.

The operation of the overload protector and the plug using the same according to the present invention made as described above will be described with reference to FIG.

In order to use the electric device using the plug 100 according to the present invention, when the plug pins 54a and 54b are inserted into a power outlet and the electric device is operated, the protector 60 is in an initial state, that is, the movable contact. Since 68 is attached to the fixed contact 62, a current is supplied.

When power is supplied in the above state and an overcurrent flows in the bimetal 66 due to an abnormal power supply or an abnormality of the electric device, the bimetal 66 is heated so that the movable contact 68 is fixed to the fixed contact 62. The rear surface of the movable contact 68 is deformed until it comes into contact with the stopper 64c and stops while being separated from it.

At this time, since the bimetal 66 is pressurized by the adjusting unit 64d, the bimetal 66 is deformed at a temperature different from that of the original deformation condition of the bimetal 66.

5. Multi-tap for overload protection (see Figure 11)

The overload protection power strip 110 according to the present invention is used by connecting the overload protectors 60 and 80 shown in the first and second embodiments to one end of each tab 112 constituting the power strip 110. will be.

That is, as shown in FIG. 11, the multi-tap 110 according to the present invention includes a plurality of tabs 112 into which other plugs connected to electric devices are inserted, and one end of each of the tabs 112 has the overload protector ( One end of 60) is connected.

The other end of each tab 112 is connected to the first connection line 116, and the other end of the overload protector 60 is connected to the second connection line 118, respectively, and the second connection line 118 is It is connected to the switch 115, the first connecting line 116 and the switch 115 is connected to the plug 100 through the power cord (52).

The plug 100 shown in FIG. 11 includes an overload protector 60, but in some cases, a general plug may be used.

Meanwhile, although FIG. 11 illustrates a multi-tap 110 having a plurality of tabs 112 installed as an example, in the case of a single tap, the first connection line 116 and the second connection line 118 are formed.

The present invention made as described above provides the effect of increasing the productivity because the overload protector used in the power terminal of the electrical equipment can be mass-produced to a certain standard, the operating point can be set according to the rated electric capacity of the applied electrical equipment. .

Claims (11)

A conductive plate having a fixed contact formed on one surface thereof, A bimetal formed at one end of the movable contact in contact with the fixed contact; A stopper for restricting movement of the rear surface of the movable contact is formed at an opposite position between the fixed part to which the other end of the bimetal is fixed and the movable contact of the bimetal, and is electrically insulated from the conductive plate made of a conductive material having a can structure. Cans combined, An adjustment part positioned between the fixing part formed in the can and the stopper to press the bimetal by a predetermined displacement toward the fixing contact point; And the conductive plate is insulated by a first insulating member attached to a lower surface, and the can is attached to the conductive plate with a second insulating member attached thereto. delete delete 2. The overload protector according to claim 1, wherein the position of the adjusting portion is within 1/4 of the position between the fixing portion and the stopper. The overload protector according to claim 1 or 4, wherein the adjustment part is protruded to a predetermined depth in the can. 6. The overload protector according to claim 5, wherein the adjusting portion is formed by a punch. 5. The overload protector of claim 1 or 4, wherein the adjustment unit is a protrusion coupled to the can with a predetermined length. 8. The overload protector of claim 7, wherein the protrusion can vary in length. 9. The overload protector of claim 8, wherein the protrusion is a bolt that forms a nut in the can and is coupled to the nut. A power plug comprising at least two cords and plug pins each, A conductive plate formed at one surface thereof and connected to any one cord and any one plug pin of the power plug; A bimetal having one end of the movable contact in contact with the fixed contact; A stopper for restricting movement of the rear surface of the movable contact is formed at an opposite position between the fixed part to which the other end of the bimetal is fixed and the movable contact of the bimetal, and is electrically insulated from the conductive plate made of a conductive material having a can structure. A can coupled to one side of which is connected to the other of the cord and one of the plug pins; An adjusting part positioned between the fixing part formed in the can and the stopper to press the bimetal by a predetermined displacement toward the fixing contact point; Plug for overload protection, comprising a. On the power strip to which the power cord is connected, At least one tab into which a plug of another electrical device is inserted; A fixed contact formed on one surface of the conductive plate and connected to one of the power cord and one end of the tab; A bimetal having one end of the movable contact in contact with the fixed contact; A stopper for restricting movement of the rear surface of the movable contact is formed at an opposite position between the fixed part to which the other end of the bimetal is fixed and the movable contact of the bimetal, and is electrically insulated from the conductive plate made of a conductive material having a can structure. A can coupled to one of the power cord and the other of one end of the tab; An adjusting part positioned between the fixing part formed in the can and the stopper to press the bimetal by a predetermined displacement toward the fixing contact point; Power tap for overload protection, characterized in that it comprises a.

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