JPH01167922A - Arc gas exhaust device - Google Patents

Abstract

PURPOSE:To reduce the quantity of parts, enlarge the opening area of an exhaust port and enhance exhaust efficiency by closing the exhaust port with an exhaust board and causing the elastic deformation of the exhaust board with arc gas pressure. CONSTITUTION:While a rated current is flowing at a contact point part 7, an exhaust port 4 is closed due to the elastic deformation of an exhaust board 1 and an ingress of foreign materials from the exhaust port 4 is thereby prevented. On the other hand, the contact point part 7 opens upon occurrence of shortcircuit and an arc and arc gases are generated between a movable contact point 9 and a fixed contact point 8. And when arc gas pressure increases, the exhaust board 1 is pushed and elastically deformed, thereby releasing the exhaust port 4 and causing the exhaust of arc gases Q outside through the exhaust port 4.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to an arc gas exhaust device applied to a circuit breaker or the like.

[Background technology]

FIG. 6 shows a conventional example. That is, this arc gas exhaust device is applied to a three-pole circuit breaker, and is composed of a lower case 50 and an upper case 51, a main case 53 having an exhaust hole 52 at the joint part, and a dustproof cover 54. has been done. A vertical groove 55 is formed on the opposing side surface of the exhaust hole 52, and engaging ears 54a on both sides of the base end of the dustproof cover 54 are engaged with the vertical groove 55. The dustproof cover 54 is formed of an elastic plate, and has a folded part 54b in the thickness direction at the base end.
The end of the exhaust plate 56 having the small exhaust hole 56a engages with the folded portion 54b.

The exhaust hole 52 is closed by an exhaust plate 56, and the small exhaust hole 56a is closed by a dustproof cover 54, which prevents foreign matter from entering from the outside and prevents poor contact between contacts (not shown) inside the main body case 53. Preventing occurrence. Then, when the short circuit is broken, an arc is generated at the contact part and arc gas is generated to increase the arc gas pressure, and the dustproof cover 54 is pushed through the small exhaust hole 56a, and the dustproof cover 54 is elastically deformed outward and is exhausted at the same time.

However, this arc gas exhaust device does not have a dust cover 54.
The part that is elastically deformed and shaped by the arc gas pressure is the retaining ear piece 5.
4a, it is useless to form the small exhaust hole 56a in the part of the exhaust plate 56 facing the retaining lug 54a, and the dustproof cover 54 is not able to be exhausted effectively because of the small amount of fall. Since the area of the exhaust opening cannot be made large, the exhaust volume cannot be increased, which has the disadvantage of poor exhaust efficiency. As a result, the arc gas pressure increases, causing deterioration of the internal insulation, and in order to avoid this, it was necessary to increase the size of the equipment.

Furthermore, since the dustproof cover 54 is provided, the number of parts is large, which makes assembly complicated and increases costs.

[Purpose of the invention]

An object of the present invention is to provide an arc gas exhaust device that can reduce the number of parts and improve exhaust efficiency.

[Disclosure of the invention]

The arc gas exhaust device of the present invention includes a main body case having an exhaust hole provided with an exhaust plate fixing part, and a fixing part fixed to the exhaust plate fixing part to block the exhaust hole and to be elastically deformed by arc gas pressure. It is equipped with an exhaust plate.

According to the configuration of this invention, the exhaust hole is closed with the exhaust plate and the exhaust plate is elastically deformed by the arc gas pressure, so the conventional dustproof cover is not required and the number of parts can be reduced, making assembly easy and cost-effective. can do. Further, since the exhaust hole is opened by the exhaust plate being elastically deformed by the arc gas pressure, the opening area of the exhaust hole can be increased compared to a case where a small exhaust hole is formed, and therefore the exhaust efficiency can be improved.

Embodiment A first embodiment of the present invention will be described with reference to FIGS. 1 to 4. That is, this arc gas exhaust device consists of an exhaust plate 1 and a main body case 2.

The exhaust plate 1 is formed of an elastic plate and has a fixing part 5. The fixed portion 5 is formed by widening one end side.

The main body case 2 has an exhaust hole 4 with which the exhaust plate 1 is closed, and an exhaust plate fixing portion 3 is formed in the exhaust hole 4 .

The exhaust plate fixing part 3 is an example of grooves formed on both sides of the exhaust hole 4.

The main body case 2 is applied to a three-pole circuit breaker, and consists of a lower case 6a and an upper case 6b, and an exhaust hole 4 is formed in the joint portion of the lower case 6a and upper case 6b.

The contact portion 7, which serves as an arc generation source, is composed of a fixed contact 10 and a movable contact 11, each having a fixed contact 8 and a movable contact 9 that are in mutual contact with each other. The contact portion 7 is provided with three poles, each of which is isolated within the main body case 2. The fixed contact 10 integrally forms a power supply side terminal plate 12. The opening mechanism 13 is connected to each movable contact 11, and separates the movable contact 11 from the fixed contact 8 when an abnormal current such as an overcurrent or a short circuit current flows through the contact portion 7. The handle 14 is connected to the contact opening mechanism 13, and its upper part protrudes from the top surface of the main body case 2. In addition to normal on/off operations, the handle 14 is used to connect the movable contact 9, which has been separated in the event of an overcurrent or short circuit accident, to the original contact point 8 that contacts the fixed contact 8. Return to state. 20 is a load side terminal, and 21 is a lead wire connecting the load side terminal 20 and an abnormal current detection section (not shown) of the contact opening mechanism 13.

A power supply side terminal plate 12 is disposed on the bottom surface of the exhaust hole 4.

15 is a terminal screw, and 16 is a washer.

Further, the fixing part 5 of the exhaust plate 1 engages with the exhaust plate fixing part 3 of the exhaust hole 4, the lower end of the exhaust plate l comes into contact with the power supply side terminal plate 12, and the upper end is prevented from coming out by the upper case 6b. The exhaust plate 1 is elastically deformed on the side opposite to the power supply side terminal plate 12.

In this arc gas exhaust device, normally, that is, while the rated current is flowing through the contact portion 7, the exhaust hole 4 is closed by elastic deformation of the exhaust plate 1, and foreign matter can be prevented from entering through the exhaust hole 4. . On the other hand, for example, in the event of a short circuit, the contact portion 7
opens, an arc is generated between the movable contact 9 and the fixed contact 8, and at the same time arc gas is generated, and when the arc gas pressure increases, the exhaust plate 1 is pushed and elastically deformed, opening as shown in FIG. The arc gas Q is exhausted to the outside through the exhaust hole 4 due to its pressure. When the arc gas pressure decreases and the restoring force of the dustproof cover 1 becomes stronger, the exhaust plate 1 returns to its original position and closes the exhaust hole 4 again.

According to this embodiment, since the exhaust hole 4 is closed with the exhaust plate 1 and the exhaust plate 1 is elastically deformed by the arc gas pressure, the conventional dustproof cover is not required and the number of parts can be reduced, and therefore assembly is easy and cost-effective. It can be done cheaply. In addition, the exhaust plate 1 is elastically deformed by the arc gas pressure, so that the exhaust hole 4
Because the exhaust hole 4 is opened, the opening area of the exhaust hole 4 can be made larger (thus, the exhaust efficiency can be improved) compared to the case where small exhaust holes are formed in the exhaust plate.As a result, the insulation inside equipment such as circuit breakers can be improved. The condition is less likely to deteriorate, and the equipment can be made smaller.

Furthermore, in this embodiment, when the exhaust plate 1 is elastically deformed, the arc gas pressure is exhausted in the direction away from the power supply side terminal plate 12, thereby preventing the occurrence of a short circuit between the poles between the power supply side terminal plates 12 between the exhaust holes 4. can do.

A second embodiment of the invention is shown in FIG. That is, this arc gas exhaust device is an exhaust plate in which an inverted U-shaped slit 1a is formed in the center of the exhaust plate 1 in the first embodiment, and grooves are formed on both sides of the exhaust plate 1 as fixed parts 5. It is fixed to the fixed part 3, and the inside of the slit 1a is elastically deformed by arc gas pressure.

Although the main body case 2 of the above embodiment has a three-pole structure, the number of poles may be one or more.

〔Effect of the invention〕

According to the 7-gas exhaust device of the present invention, since the exhaust hole is blocked by the exhaust plate and the exhaust plate is elastically deformed by the arc gas pressure, the conventional dustproof cover is unnecessary, the number of parts can be reduced, and assembly is therefore easy. can reduce costs. In addition, since the exhaust hole opens when the exhaust plate is elastically deformed by the arc gas pressure, the opening area of the exhaust hole can be made larger compared to a case where small exhaust holes are formed in the exhaust plate, which has the effect of improving exhaust efficiency. There is.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view of the first embodiment of the present invention, Fig. 2 is a schematic sectional view of a circuit breaker, Fig. 3 is a schematic plan view thereof, and Fig. 4 is a partial sectional view of the arc gas exhaust device in its operating state. , FIG. 5 is a perspective view of the exhaust plate of the second embodiment, and FIG. 6 is an exploded perspective view of the conventional example. 1... Exhaust plate, 2... Main body case, 3... Exhaust plate fixing part, 4... Exhaust hole, 5... Fixing part Fig. 1 Fig. 2 113 Fig. 4m 115 Fig. 6 Figure procedure amendment divination (1, 1) 1986 Patent Application No. 332883 2, Name of the invention Arc gas exhaust device 3, Person making the amendment Relationship with Hanyu Applicant 4, Agent 5, Date of amendment order (1) In the 4th line of page 3 of the specification, the phrase “Because it will become expensive” is corrected to “It will become expensive again.” (2) In the 6th line of page 7 of the specification, “The Correct the phrase ``insulated'' to ``the pressure inside the equipment decreases and it is insulated.''

Claims (1)

[Claims] An arc gas comprising: a main body case having an exhaust hole provided with an exhaust plate fixing part; and an exhaust plate having a fixing part fixed to the exhaust plate fixing part to block the exhaust hole and to be elastically deformed by arc gas pressure. Exhaust device.