KR20080024846A - Protector of over load - Google Patents

Abstract

An overcurrent circuit breaker is provided to minimize damage of contacts by reducing shock between two contacts. An overcurrent circuit breaker includes first and second conductive pins(35,36), first and second connecting ends(39,40), a fixed contact plate(43), a movable contact plate(49), and a guide pin(51). The first and second conductive pins are coupled with both sides of a lower plate(31). The first and second connecting ends are coupled with lower parts of the first and second conductive pins respectively and are projected outside the lower plate. The fixed contact plate is coupled with an upper part of the first conductive pin and formed inside the lower plate. First and second fixed contacts(45,46) are formed at the fixed contact plate. The movable contact plate is coupled with an upper part of the second conduction plate and formed inside the lower plate. First and second movable contacts(47,48) contacted on the first and second fixed contacts are formed on one surface of the movable contact plate. The guide pin is formed at an upper plate(32) and presses the movable contact plate by predetermined displacement.

Description

Overcurrent Breaker {Protector of Over Load}

1 is a cross-sectional view showing a conventional overcurrent breaker.

2 is a perspective view showing an overcurrent breaker according to the present invention.

3 is a cross-sectional view showing an overcurrent breaker according to the present invention.

Figure 4 is an internal structure diagram showing an overcurrent breaker according to the present invention.

5 is a plan view showing a contact structure used in the present invention.

6 is a plan view showing another embodiment of the contact structure used in the present invention.

7 is a plan view showing another embodiment of the contact structure used in the present invention.

<Description of the symbols for the main parts of the drawings>

31: lower plate 32: upper plate

43: fixed contact plate 45: first fixed contact

46: second fixed contact point 47: first movable contact point

48: second movable contact 49: movable contact plate

51: guide pin 52: tab

53: cover

The present invention relates to an over-current circuit breaker, and more particularly, to an over-current circuit breaker to block the over-current by forming a fixed contact and a movable contact to two contacts.

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, the conventional over-current circuit breaker 10, as shown in Figure 1, the conductive plate 1 is formed with a fixed contact 2 on one side and the first connection end 3 on one side, the A bimetal 6 having a movable contact 8 contacting the stationary contact 2 formed on the conductive plate 1 and having a can structure made of a conductive material, the other end of the bimetal 6 having an inner surface thereof. Can 4 is fixed to one side of the second connecting end 5 is formed on one side, the first insulating plate 12 attached to the lower surface of the conductive plate 1, the can 4 and the conductive plate ( 1) the second insulating plate 13 attached to the contact portion between the insulating layer 13, the base 11 attached to the lower surface of the first insulating plate 12, and the can toward the bimetal 6 4) is formed downwardly projecting portion consisting of an adjusting unit 17 for pressing the intermediate portion of the bimetal 6 by a predetermined displacement do.

However, in the conventional overcurrent circuit breaker 10, since each of the contacts is one by one, foreign matter on the surface of the fixed contact (2) or the movable contact (8) may cause a poor energization, fixed contact (2) when used for a long time And carbon is deposited on the surface of the movable contact (8) there is a problem that a poor contact occurs.

In addition, the contact is deformed due to the impact and accumulation of metal fatigue generated between the fixed contact 2 and the movable contact 8, resulting in a problem of contact failure.

The present invention is to solve the above problems, by providing two fixed contacts and the number of movable contacts to provide an over-current circuit breaker that the over-current is cut through the other contact even if poor current flow in one contact There is a purpose.

In order to achieve the above object, the present invention provides an overcurrent circuit breaker formed by coupling an upper plate and a lower plate of an insulating material, the conductive first conductive pins and the second conductive pins coupled to both sides of the lower plate, and the first conductive pins. A first connection end and a second connection end of the conductive portion which are connected to the lower portion of the pin and the second conductive pin to protrude to the outside of the lower plate, and are coupled to an upper portion of the first conductive pin and are formed inside the lower plate. A fixed contact plate having a first fixed contact point and a second fixed contact point formed thereon, the first contact point being coupled to an upper portion of the second conductive pin and formed into the lower plate, and contacting the first fixed contact point and the second fixed contact point; And a movable contact plate having a second movable contact formed at one end thereof, and a guide pin formed at the upper plate to press the movable contact plate by a predetermined displacement. An overcurrent circuit breaker is provided.

The guide pin is characterized in that a tab for adjusting the depth of the guide pin is formed.

The upper surface of the upper plate is characterized in that the cover is formed to protect the guide pin and the tab.

A first cutout is formed between the first movable contact and the second movable contact.

The movable contact plate is characterized in that a pair of second incision is formed.

The horizontal length of the first cutout and the first movable contact and the first fixed contact or between the movable contact and the fixed contact of any one of the second movable contact and the second fixed contact is inserted into the other one of the movable contact The ratio of the diameter of the foreign matter to be energized only and the fixed contact is characterized in that 38: 1 to 47: 1.

The horizontal length of the first cutout is characterized in that 2.7mm to 3.3mm.

The diameter of the foreign material inserted between the movable contact and the fixed contact is blocked between the energization of the contact is 0.063mm to 0.077mm.

(Example)

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

Figure 2 is a perspective view showing an overcurrent breaker according to the present invention, Figure 3 is a cross-sectional view showing an overcurrent breaker according to the present invention, Figure 4 is an internal structure diagram showing an overcurrent breaker according to the present invention, Figure 5 is a contact point used in the present invention 6 is a plan view showing another embodiment of the contact structure used in the present invention, and FIG. 7 is a plan view showing another embodiment of the contact structure used in the present invention.

1. First embodiment

In the first embodiment of the overcurrent circuit breaker according to the present invention, as shown in Figs. 2 to 5, the upper plate 32 and the lower plate 31 of the insulating material are combined to constitute an overcurrent circuit breaker 30 having an internal space. On both sides of the lower plate 31, conductive first conductive pins 35 and second conductive pins 36 are formed.

In addition, the conductive first connection end 39 connected to the lower portion of the first conductive pin 35 and the conductive second connection end 40 connected to the lower portion of the second conductive pin 36 are external to the lower plate 31. Is formed to protrude into.

The fixed contact plate 43 on which the first fixed contact 45 and the second fixed contact 46 are formed is connected to the first conductive pin 35 through the first connector 44 and extends into the lower plate 31. The movable contact plate 49 having the first movable contact 47 and the second movable contact 48, which is in contact with the first fixed contact 45 and the second fixed contact 46, has a second connector 50. It is connected to the upper portion of the second conductive pin 36 through the lower plate 31 extends into.

The guide pin 51 for pressing the movable contact plate 49 by a predetermined displacement is coupled to the center of the upper plate 32 to be formed into the lower plate 31, and the cover 53 to protect the guide pin 51. Is coupled to the top plate 32 constitutes an overcurrent breaker.

The outer circumferential surface of the guide pin 51 is a bolt having a threaded groove, and a nut having a thread corresponding to the bolt is formed inside the upper plate 32.

Guide pin 51 is screwed to the upper plate 32 is adjustable in depth to press the middle portion of the movable contact plate 49 by the screwed displacement.

In addition, the upper surface of the guide pin 51 is formed with a tab 52 for adjusting the depth of the guide pin 51, the guide pin for rotating the tab 52 to adjust the depth of the guide pin 51 Move 51 up / down.

The depth of the guide pin 51 is set in consideration of the operating temperature of the movable contact plate 49 with reference to the power consumption VA of the electric equipment used based on the data according to the repetitive test. May be arbitrarily changed and used.

Then, by forming the first and second fixed contacts 45 and 46 and the first and second movable contacts 47 and 48 as two, even if foreign matter is buried on one contact, the other side may cause problems. It can operate without any problem because it can be energized.

In addition, as shown in FIG. 5 (b), in the present invention, the first cutout 20 is formed between the first movable contact 47 and the second movable contact 48, and the movable contact plate 49 is formed. A second cutout 21 is formed on the surface to dissipate heat generated by contact resistance to the maximum space when the movable contact and the fixed contact are in contact.

The contact pressure between the movable contact and the fixed contact varies depending on the horizontal length of the first cutout 20.

Contact pressure is measured as follows.

First, in order to determine the horizontal length of the first cutout 20, the movable contact plate 49 is fixed by using a tension gauge.

Then, a micrometer is connected to contact the first movable contact 47 among two movable contacts, and a height gauge is connected to the lamp at the second movable contact 48, and the micrometer and the height are connected. Zero the gauge.

Thus, the micrometer is connected to the first movable contact 47, the height gauge is connected to the second movable contact 48, and the lamp is turned on.

Then, the change in the height gauge connected to the second movable contact 48 while applying a little pressure to the first movable contact 47 using a micrometer.

When a small amount of pressure is continuously applied to the first movable contact 47 using a micrometer, the lamp is turned off while the height gauge connected to the second movable contact 48 and the second movable contact 48 are separated.

That is, when foreign matter is inserted between the first movable contact 47 and the first fixed contact 45, the first movable contact 47 is pressed downward by the diameter of the foreign matter, and the second movable contact ( 48) and the second fixed contact point 46 are disconnected while the energization is cut off.

Therefore, even if foreign matter is inserted into one of the contacts 45 and 47, and the current is cut off, the other contact 46 and 48 must be energized, but the range to endure the pressure caused by the foreign matter is transverse to the first cutout 20. It depends on the length.

In the present invention, the length of the first cutout 20 is formed to be 2 millimeters, 3 millimeters, and 5.1 millimeters so that when foreign matter is inserted into one of the contacts 45 and 47, the other end contacts 46 and 48 withstand pressure. I checked the range.

When the horizontal length of the first cutout 20 is 2 millimeters, the energization of the other contacts 46 and 48 is continued until the diameter of the foreign matter inserted into one of the contacts 45 and 47 is 0.04 millimeter.

When the horizontal length of the first cutout 20 is 3 millimeters, the energization of the other contacts 46 and 48 is continued until the diameter of the foreign matter inserted into the one contact 45 and 47 is 0.07 millimeters.

When the horizontal length of the first cutout 20 is formed to be 5.1 millimeters, the energization of the other contacts 46 and 48 only lasts until the diameter of the foreign matter inserted into the one contact 45 or 47 is 0.15 millimeters.

As a result, the longer the horizontal length of the first incision 20 can withstand the pressure caused by the foreign matter having a larger diameter.

Therefore, forming the transverse length of the first cutout 20 at 5.1 mm has the highest reliability for the contact to be energized.

However, when the horizontal length of the first cutout 20 is formed to be 5.1 mm long, deformation may occur when the movable contact plate 49 is independently moved or stored, and other defects may occur.

On the other hand, if the horizontal length of the first cutout portion 20 is made small to 2 millimeters, even if a very fine foreign matter is inserted into the contact, the conduction of the contact is blocked, so the reliability is low.

Therefore, when the movable contact plate 49 itself is not moved or stored, no deformation occurs, and even if foreign matter is inserted, it is preferable that the horizontal length of the first cutout portion 20 that is reliable for energizing the contact is formed to be 3 mm. .

As a result, when the horizontal length range of the first cutout 20 is formed to be 2.7 to 3.3 millimeters, the first fixed contact 45 and the first movable contact 47 or the second fixed contact 46 and the second The foreign material inserted between the movable contact and the fixed contact of any one of the movable contacts 48 to block the energization of the fixed contact and the movable contact has a diameter of 0.063 mm to 0.077 mm.

In other words, if a foreign material having a diameter between 0.064mm and 0.077mm between one of the movable contact points and the fixed contact point is inserted, a space is formed between the movable contact point and the fixed contact point to block the energization. Power is also cut off by the fixed contact.

Then, comparing the diameter of the foreign material inserted between the movable contact and the fixed contact to cut off the electrical current between the contact between the transverse length of the first cutout 20, that is, the transverse length of the first cutout 20 versus The diameter is formed in the ratio of 38: 1-47: 1.

In addition, since the impact received by the contact is divided into two during the reliability test and the life test, the impact received by the contact is alleviated, thereby minimizing damage to the contact.

Therefore, minimizing damage to the contacts has the effect of improving reliability and quality.

2. Second Embodiment

In the second embodiment of the overcurrent circuit breaker according to the present invention, as shown in Fig. 6, the other components are identical to the first fixed contact 45 and the second fixed contact 46 of the first embodiment (the same components are used). Description is omitted).

That is, in the second embodiment, the first fixed contact point 45 and the second fixed contact point 46 are integrally formed and the fixed contact point 63 is formed by increasing the area.

According to this second embodiment, since the fixed contact 63 is wide, efficient contact is made when the movable contacts 47 and 48 come into contact with each other, which is effective in blocking overcurrent.

3. Third embodiment

In the third embodiment of the overcurrent circuit breaker according to the present invention, as shown in Fig. 7, other components other than the first movable contact 47 and the second movable contact 48 of the first embodiment are the same (in the same component). Description is omitted).

That is, in the third embodiment, the movable contact 65 is formed by integrally forming the first movable contact 47 and the second movable contact 48 and widening the area.

According to this third embodiment, when the movable contact 65 is wide and in contact with the fixed contacts 45 and 46, efficient contact is made, which is effective in blocking overcurrent.

4. Manufacturing process of overcurrent breaker

The manufacturing process of the overcurrent circuit breaker which concerns on this invention is demonstrated.

First, the conductive first connection end 39 and the second connection end 40 are coupled to both lower sides of the lower plate 31 of insulating material.

Next, the fixed contact plate 43 in which the first and second fixed contacts 45 and 46 are welded to one side end is coupled to the upper side of the lower plate 31, and the first and second movable contacts 47 to one side end. , 48 is coupled to the movable contact plate 49 formed on the other side of the lower plate (31).

After inserting the conductive first conductive pin 35 into the first connector 44 formed in the fixed contact plate 43 and penetrating through the first connection terminal 39, as shown in FIG. The ends of the conductive pins 35 are bent to the left and right to be in close contact with the lower portion of the first connection end 39 to fix the first connection end 39 and the fixed contact plate 43.

In addition, a conductive second conductive pin 36 is inserted into the second connector 50 formed in the movable contact plate 49 to penetrate through the second connection end 40, and then the end portion of the second conductive pin 36 is formed. To be bent left and right close to the bottom of the second connection end 40 to fix the second connection end 40 and the movable contact plate 49.

Then, the upper plate 32 on which the guide pins 51 are mounted is coupled to the upper surface of the lower plate 31, and the cover 53 protecting the guide pins 51 and the tabs 52 on the upper surface of the upper plate 32. Cover.

Here, the cover 53 may be formed before the upper plate 32 is coupled to the lower plate 31.

In addition, here, the well-known technique of this field utilized for the connection of the electrically conductive part, such as spot welding, solder welding, and pressure welding, is used for the fixed connection part between conductive parts.

The over-current breaker according to the present invention is built in the over-current circuit breaker shown in the first to third embodiments in the cooling / heating devices such as refrigerators, air conditioners, hot air heaters, etc. to prevent the overcurrent of the load of the electrical equipment flows to damage the electrical equipment Prevent it.

In addition, the overcurrent breaker according to the present invention uses an overcurrent breaker in which the operating temperature of the movable contact plate 49 is set in advance by the guide pin 51 according to the power consumption of the electric device. The circuit breaker can be selected and manufactured.

Therefore, when the electric device with the overcurrent breaker according to the present invention is operated, the overcurrent breaker is attached to the first and second fixed contacts 45 and 46 in an initial state, that is, the first and second movable contacts 47 and 48. The current is supplied because it is in a closed state.

If overcurrent flows to the movable contact plate 49 due to an abnormal power supply or an abnormality of the electric device, the movable contact plate 49 is heated, so that the first and second movable contacts 47 and 48 become first and second. It is separated from the second fixed contact point (45, 46).

At this time, since the movable contact plate 49 is pressurized by the guide pin 51, deformation is performed at a temperature different from that of the original deformation condition of the movable contact plate 49.

According to the present invention, the overcurrent circuit breaker formed of two fixed contacts and two movable contacts may be used to block the flow of the overcurrent by using another contact even when an abnormality occurs in one contact.

In addition, since there are two contacts, damage to the contact is minimized because the impact received by the contact when the contact is in contact with the contact is minimized.

Claims (8)

In the overcurrent circuit breaker formed by combining the upper plate and the lower plate of the insulating material, Conductive first conductive pins and second conductive pins coupled to both sides of the lower plate; First and second conductive ends connected to the lower portions of the first conductive pin and the second conductive pin to protrude to the outside of the lower plate, respectively; A fixed contact plate coupled to an upper portion of the first conductive pin and formed into the lower plate, and having a first fixed contact point and a second fixed contact point formed on one surface thereof; A movable contact plate coupled to an upper portion of the second conductive pin and formed into the lower plate, wherein the first movable contact and the second movable contact are in contact with the first fixed contact and the second fixed contact; A guide pin formed on the upper plate to pressurize the movable contact plate by a predetermined displacement; Overcurrent circuit breaker comprising a. The method of claim 1, The guide pin is an overcurrent breaker, characterized in that the tab is formed to adjust the depth of the guide pin. The method of claim 2, And a cover for protecting the guide pin and the tab on an upper surface of the upper plate. The method according to any one of claims 1 to 3, And a first cutout is formed between the first movable contact and the second movable contact. The method of claim 4, wherein And a pair of second cutouts are formed in the movable contact plate. The method of claim 4, wherein The horizontal length of the first cutout and the first movable contact and the first fixed contact or between the movable contact and the fixed contact of any one of the second movable contact and the second fixed contact is inserted into the other one of the movable contact And the ratio of the diameter of the foreign matter to be energized only with the fixed contact is 38: 1 to 47: 1. The method of claim 6, The over-current breaker of claim 1, wherein the horizontal length of the first cutout is 2.7mm to 3.3mm. The method of claim 6, An overcurrent circuit breaker, characterized in that the diameter of the foreign material inserted between the one of the movable contact and the fixed contact to block the energization of the contact is 0.063mm to 0.077mm.

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