JPH02148524A - Breaker for use in vehicle - Google Patents

Abstract

PURPOSE:To reduce overheating of a coil and make the device smaller, by forming the arc runner portion of an upper arc guide in such a manner that it covers that portion of a main contact which faces a blow-out coil and both sides of the contact. CONSTITUTION:The arc runner portion 21a of an upper arc guide 21 is so formed that it fully covers that portion of an upper main contact 6 which faces a blow-out coil 1 and the side faces of the contact 6. The guide 21 is passed between the outer side of the runner portion 21a and the coil 1, and the absence of a partition wall allows air to freely circulate therethrough and convection of air is effectively performed as a result. Arc generated between upper and lower main contacts 6a, 6b will not be extinguished out of the runner portion 21 because of the runner portion 21a fully covering the contact 6 and the blowing force of the coil 1; since air is allowed to pass through portions at both sides of the runner 21 of the guide 21 and circulate and rise because of its full convection, the coil 1 is effectively extinguished by the air.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a circuit breaker for vehicles such as electric cars.

[Conventional technology]

The ones shown in Figures 3 to 5 are, for example,
This is an example of a conventional vehicle circuit breaker shown in Japanese Patent No. 4072.

In the figure, symbol (1) is the blowout coil, (2) is the upper arc guide, and upper arc guide (2) is the blowout coil (
1) and the upper main contactor (6a), there is a partition wall (2a) separating the two. In addition, (3) shows the iron core, (4) shows the iron core support, (5) shows the air convection accompanying the heat generation of the blowing coil (1), (6a) and (6b) show the upper and lower main contacts, and (7) ) is a lower movable part that is configured to be movable up and down by a drive source (not shown).

Also, (81(9) is the upper and lower arc flow, (]O
) lower arc guide, (11) is upper and lower arc guide (2)
(10) shows a transitioning arc.

Next, the operation of the above-mentioned conventional device will be explained.

When the lower movable part (7) is driven by a cylinder device using compressed air as a drive source, a movable lower main contact (6b) provided at the tip of the piston rod of the cylinder device via an insulator. rises and closes with the opposing upper main contact (6a), making the circuit breaker energized.

In this way, the upper and lower main contacts (6a) and (6b) may be repeatedly closed or opened as necessary, or may remain closed for a long period of time.

In addition, the current supplied is often quite large, and the blowing coil (1) generates heat due to its own resistance. Furthermore, when the circuit breaker opens while energized, an arc (11) is fired from the upper and lower main contacts (6a) (6b), and the roots of the arcs are blown out by the upper and lower arc guides (2) (10'). ), and after being driven into the air, it is cooled by upper and lower arc flow 8) and (9), and the interruption is completed.

[Problem to be solved by the invention]

The conventional upper arc guide (2) K has a K in its horn portion to protect the blowing coil (1) from the arc (11).

As mentioned above, generally a partition wall (2a) is provided between the blowing coil (1) side and the main contactor (6a) side,
1) was prevented from entering the blowing coil (1) side.

On the other hand, for this partition wall (2a), a blowout coil (1) is installed.
Air convection (5) which promotes cooling cannot be expected and therefore the blowing coil (5) is regulated by the temperature rise value.
In the case of 1), in order to suppress the temperature rise, the current carrying cross-sectional area must be designed to be large, and therefore the blowing coil (1) has to be considerably enlarged.

Therefore, it has been difficult to reduce the size and weight of the circuit breaker.

Furthermore, the structure of the upper arc guide (2) is complicated due to the partition wall (2a), and therefore the productivity of manufacturing the material and the workability during machining are reduced.

As described above, the conventional device has a number of problems, and it is necessary to solve these problems.

This invention was made to solve the above-mentioned problems, and suppresses temperature rise by increasing the cooling effect of the blowout coil, thereby preventing local insulation deterioration, and
The purpose of the present invention is to provide a circuit breaker for a vehicle that is small and lightweight and has improved productivity.

[Means for Solving the Problems] The vehicle circuit breaker according to the present invention has an upper actuation guide that
The arc runner part is formed to sufficiently cover the blowing coil side and side surfaces of the fixedly provided upper main contact, and the space between the blowing coil and the outside of the arc runner is It allows air to circulate through it.

[For production]

Since the circuit breaker according to the present invention is configured as described above, it can blow out the arc caused by the opening of the energized main contact with the blowing force of the blowing coil without leaking the arc to both outsides of the arc runner. Air flows from both outer sides of the arc runner through the penetration portions toward the blowout coil, activating air convection and improving the cooling effect of the blowout coil.

〔Example〕

The present invention will be explained below based on the drawings showing one embodiment thereof.

In addition, codes (1) (3) to (5) (6a) (6b) (7
) are equivalent to those shown with the same reference numerals in the conventional device.

In FIGS. 1 and 2, (21) is an upper arc guide, and (21a), which is a part of the upper arc guide, is an arc runner part (21a) of the upper arc guide (21). ) is formed to sufficiently cover the blowing coil (1) side and side surfaces of the upper main contactor (6a). Further, the upper arc guide (21) passes through between the outside of the arc runner part (21a) and the blowing coil (1), and the partition wall (2a) in the conventional bag # is not provided. Therefore, air can freely flow through this portion, and as a result, air convection can be carried out effectively.

Since this embodiment is configured as described above, the scum generated between the upper and lower main contacts (6a) (6b) can be removed from the arc runner part (6a) which sufficiently covers the upper main contact (6a). 21a) and the blowing force of the blowing coil (1), there is no arc leakage outside the arc runner part (21a).
In addition, the blowing coil (1) is raised by sufficient convection through the penetrating portions on both sides of the arc runner (21) of the upper arc guide (21). ) are effectively cooled.

〔Effect of the invention〕

As described above, according to this invention, the arc runner part of the upper arc guide is formed to sufficiently cover the blowing coil side and both sides of the upper main contact, so that the arc flows from the arc runner part to the blowing coil side. Therefore, the arc will not enter the blowout coil side, and the side part of the arc runner part of the upper arc guide can be separated by removing the partition wall and separating the blowout coil side and the arc runner part side. Since the blowout coil is passed through both sides, the natural convection of the air around the blowout coil becomes active, and therefore the heat generated by the blowout coil itself and the heated air around it are dissipated, and especially the cold air from below is dissipated. Ventilation is promoted, the above-mentioned scum is prevented from entering the blowing coil side, and coil overheating can be reduced.
As a result, local insulation deterioration can be prevented, and there is no need to increase the size of the blowout coil. Therefore, the equipment can be made smaller and lighter, and the configuration can be simplified.
This has the effect of providing a vehicle circuit breaker that can also improve productivity.

[Brief explanation of the drawing]

FIG. 1 is a side view showing an embodiment of the present invention, FIG. 2 is a sectional view taken along line II-U in FIG. 1, FIG. 3 is a side view of an example of a conventional vehicle circuit breaker, and FIG. is y −+v in Figure 3
5 is a vertical sectional side view of FIG. 3; (1) - Blowing coil, (3) Φ iron core, (63)ee
Upper main contact, (21)... Upper arc guide, (21a
)・φ arc runner part. In each figure, the same reference numerals indicate the same or corresponding parts. Agent Zeng Wa Do Teru ,,°. Selection

Claims (1)

[Claims] In a vehicle circuit breaker equipped with a blowout coil and an upper arc guide, the upper arc guide is formed to sufficiently cover the blowout coil side and side surface of the fixedly provided upper contact. 1. A circuit breaker for a vehicle, comprising an arc runner section, and a passage between the blowing coil and the outside of the arc runner section to allow air to circulate.