JPS6310528B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a novel air switch in which a case housing a mechanical part is divided and arranged.

In particularly heavily contaminated areas, there is a so-called metal-clad type in which the entire mechanism is housed in an iron box, but this has the disadvantage that the open/close circuit status cannot be directly visually observed from the outside. On the other hand, a pneumatic switch called an open type or an exposed type, which is characterized by the fact that the opening/closing blade is exposed outside the device when the circuit is opened, so that the opening/closing status can be easily determined, is always in an open state, i.e. When installed for normally open use, there was a consideration that the opening/closing blade would become contaminated and corrode, causing problems when it was used for charging.

The present invention solves the above technical problems,
The main body case is divided so that the opening/closing blade can be stored independently in the divided case depending on the movement of the opening/closing blade when the circuit is opened and closed, so that the opening/closing blade is not exposed to the outside even when the circuit is opened. Moreover, the present invention provides an air switch having a feature that allows easy determination of the open/closed state from the outside.

Hereinafter, one embodiment embodying the present invention will be explained for one phase with reference to FIGS. 1 and 2. A cylindrical storage insulator 1 with openings on both sides at the upper and lower positions relative to the central lower surface of the machine frame 11. The main body insulators 2 and 3 are fixed to the storage insulator 1 at symmetrical positions with a predetermined distance between them, and the main body insulators 2 and 3 are opened at corresponding sides and closed at the other front side to form recesses 2a and 3a. . Synthetic resin dustproof covers 4 are fixed to the side openings of the recesses 2a, 3a of the main body insulators 2, 3 with an adhesive 5, and a passage 4a of a movable contact blade 12 (described later) is formed in a part of each dustproof cover 4. is transparent. Reference numeral 6 denotes an isolation chamber attached to the inner surface of the dustproof cover 4 so as to communicate with the passage 4a, and 7 is a fixed electrode disposed inside the tip of the isolation chamber 6, which is connected to the conductive metal fitting 8 and the main body insulator. It is electrically connected to external electric wires 9 led out from the back surfaces of the terminals 2 and 3. 10 is a molded cone at the base end of the external electric wire 9. Note that the fixed electrode 7 and the isolation chamber 6 are installed in left and right opposite directions.

Reference numeral 12 denotes a pair of movable contact blades formed in a substantially Z-shape so as to be able to come into contact with and separate from the fixed electrode whose central portion is fixed to the external operating shaft 13 inserted through and supported by the central portion of the storage insulator 1. Then, the operating shaft 13
Opening and closing operations are performed by rotating 90 degrees left and right. In addition, when the contact blade 12 is in the closed state shown by the solid line in FIG. 1, the entire area that is visible from the gap E between the storage insulator 1 and the main insulators 2 and 3 is covered with markings as shown in light ink in FIG. It is even better if the colored portion 12a is provided so that it can be easily seen from the outside.

Reference numerals 15 and 16 denote a pair of dustproof covers made of synthetic resin fixed to the left and right openings of the storage insulator 1 with an adhesive 17, and passages 15a and 16a for the movable contact blades 12 are provided in the upper and lower parts of these covers. It is transparent. 18 and 19 are the dustproof cover 1
A shielding plate made of a flexible material such as rubber bonded so as to cover the passages 15a and 16a of Nos. 5 and 16,
As shown in FIG. 2, for example, wave-shaped slits 18a and 19a are formed through which the movable contact blade 12 can go in and out, and the movable contact blade 12 is housed in the storage insulator 1 (see the two-dot chain line in FIG. 1). ), the inside of the storage insulator 1 is sealed to prevent corrosion of the movable contact blade 12.

S is a tapered surface formed in substantially the lower half of the opposing side surfaces of the storage insulator 1 and the main body insulators 2 and 3 so as to be spaced apart from each other toward the lower end;
The gap E between the storage insulator 1 and the main body insulators 2 and 3 is made larger toward the lower end, so that the colored part 12a of the movable contact blade 12 can be easily seen from the gap E.

In addition, drain holes (not shown) may be provided in the lower parts of the storage insulator 1 and the main body insulators 2 and 3, respectively.
Further, a sealing plug that can drain water may be engaged with the drain hole.

Now, the two-dot chain line in FIG. 1 shows a state in which the movable contact blade 12 is housed inside the storage insulator 1 and the air switch is used with the air switch normally open. In this state, the movable contact blade 12 has dustproof covers 15, 16,
Since the movable contact blade 12 is housed in the storage insulator 1 which is sealed by shielding plates 18 and 19, the movable contact blade 12 may corrode due to dust, pollution, etc., making it impossible to insert the movable contact blade 12, or causing contact failure and causing a burnout accident. It is possible to prevent this from happening and to perform a smooth charging operation.

Furthermore, the main body insulators are stored in the main body insulator 1 and the main body insulator 2,
Since the insulator is divided into three parts, it is easy to manufacture the housing (main body) insulator, and the distance of the surface leakage current of the housing insulator 1 and the main body insulators 2 and 3 is increased, and the insulation properties of the fixed electrode 7 and the movable contact blade 12 are improved. can be improved, and the entire switch can be made more compact.

On the other hand, in this embodiment, when the movable contact blade 12 of the normally open type air switch is inserted into the fixed electrode 7 as shown by the solid line in FIG. 12a is directly visible from the gap E between the storage insulator 1 and the main body insulators 2 and 3, so it is possible to easily and reliably confirm that the switch is in the closed state.

In the above embodiment, the external electric wire 9 was connected to the main body insulators 2 and 3 via the molded cone 10.
Alternatively, the connection terminal 20 may be attached as shown in FIG.

As described in detail above, the present invention comprises a movable contact blade storage case having openings on both sides, and a main body case that is arranged symmetrically on both sides of the movable contact blade storage case and has fixed electrodes inside. The movable contact blade storage case is fixed to a frame, and the movable contact blade storage case rotatably supports a pair of rotary contact blades, and the opening of the movable contact blade storage case allows each of the rotary movable contact blades to enter and exit. In addition, by providing a dustproof means for shielding the opening when the movable contact blade is stored, the movable contact blade storage case and the main case are divided into three parts, making it easier to manufacture the storage case. The distance between the surface leakage current of each case can be increased to improve the insulation properties of the fixed electrode and the movable contact blade, and the opening/closing operation can be performed using the 90°
This can be done with one rotation, and the entire switch can be made more compact. Furthermore, the present invention can prevent corrosion of the movable contact blade regardless of whether it is in a salt-damaged area or a general area with pollution, thereby preventing burnout accidents when the contact blade is inserted, and it is possible to easily check whether the contact blade is in the input or open state. Furthermore, the insulation properties between the fixed electrode and the movable electrode can be improved, and the range of use of conventional switches in which the switching mechanism part is exposed can be expanded.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention in a two-point rotary type air switch;
FIG. 2 is an enlarged front view of the vicinity of the shielding plate, and FIG. 3 is a sectional view showing another example of the conductive member connected to the fixed electrode. Storage insulator...1, Main body insulator...2, 3, Movable contact blade...12, Dust cover...15, 16, Shield plate...1
8,19, Gap...E.

Claims (1)

[Scope of Claims] 1. A movable contact blade storage case having openings on both sides, and a main body case arranged symmetrically on both sides of the movable contact blade storage case and containing fixed electrodes, relative to the machine frame. A pair of rotary contact blades are rotatably supported in the movable contact blade storage case, and the opening of the movable contact blade storage case allows the rotary movable contact blades to enter and exit. An air switch characterized in that a dustproof means is provided for shielding the opening when the blade is stored. 2. The dustproof means includes a dustproof cover that is attached to the opening of the storage case that stores the movable contact blade and forms a passage for the movable contact blade, and a dustproof cover that is attached to the passage of the dustproof cover and prevents the entry and exit of the movable contact blade. The air switch according to claim 1, wherein the air switch is configured by a shielding plate that allows the air to pass through the air. 3. The air switch according to claim 2, wherein the shielding plate is made of a flexible material such as rubber and has a restorable slit for passing the movable contact blade.