JPS6252408B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a current interrupting device having a blowing chamber (magnetic blowing chamber).

In such a blowing chamber, a fixed contact is connected to a first deflector extending to one end of a series of arc separation fins;
a second deflector that extends to the other end of the series of fins when the movable contact in the cutoff operating range is in its open state; and a branching part, and is located in a plane perpendicular to the plane of movement of the movable contact, and the part between the series of fins of the first and second deflectors and the cutoff operating area is The arc is made at a predetermined angle with respect to the moving direction of the movable contact so that it converges in the direction of the fin, and the arc can move in the direction of the fin, resulting in a magnetic arc blowing device and a magnetic blowing device. . The structure of the arcing chamber in such an apparatus is disclosed, for example, in US Pat. No. 3,178,545, but the exact operation of the blowing apparatus is not clearly indicated.

In the blowing chamber as shown in the above-mentioned patent specification, when a breaking operation is performed due to an excessive current, the arc base electric arc moves at a speed sufficient to correspond to the current value to be cut off at the moment of this breaking. It cannot be.

The present invention is an improvement on the above device, and includes:
It is an object of the present invention to provide an arc blowing device including a deflector that allows effective arc blowing and has a shape that does not stop or delay the movement of the arc base.

The device according to the invention includes at least one blow-in loop magnetic blowing coil arranged outside the chamber in a plane parallel to the plane of movement of the movable contact, the loop being outside the cut-off operating area on the side opposite the fins. a first part passing through the fin and connected to the fixed contact, a second part parallel to the second deflector and located outside the passage followed by the arc base, and a second part facing and crossing the main body of the fin. It is characterized by containing the following parts.

In the blowing chamber disclosed in US Pat. No. 2,147,430, a blow-in loop connected to a fixed contact passes through an outer side surface of the chamber and a plane parallel to the plane of movement of the movable contact. In such devices, the deflector is not designed to converge in the direction of the interrupting operating range, the loop size is only slightly larger than the operating range, and the deflector is short enough to interrupt large currents. The moving speed of the arc cannot be obtained to the extent that the interruption time can be obtained.

The present invention will be explained below with reference to the accompanying drawings.

FIG. 1 is a sectional view of an arc chamber passing through the plane of movement of a movable contact, and FIG. 2 is a sectional view of a disconnection device using a contact bridge with two break contacts and two arc chambers, FIG. 4 is a side view of the chamber of FIG. 1, with the second deflector and movable contact removed.

In the figure, the isolation chamber 50 according to the invention comprises a fixed contact 1 and a movable contact 5 mounted on an electrically conductive contact carrier 33 which is movable in the plane of the figure (see FIG. 1). These contacts define a breaking operating area 11 comprised between the fixed contacts and the movable contacts in the open position. The fixed contact 1 is provided at one end of the first arc deflector 4,
This arc deflector is arranged in the moving direction F of the movable contact.
an intermediate slope 9 having an angle α with respect to one end 3 of a series of arc separating fins 32;
It has a first elongated portion 2 that extends in the vicinity of. The second arc deflector 6 has an end 25 located in the vicinity of the movable contact in the open position, and an intermediate inclined part 10 making an angle β with respect to said direction F;
An extension portion 7 extending near the other end 8 of the series of fins.
Contains. The intermediate ramps 9 and 10 are configured in such a way that they substantially converge towards the shutoff operating area 11 .

Each of the series of fins 32 has a main portion 17 and a branch portion 1.
9, and this branch portion 19 is installed in the direction of the cutoff operating region as shown in FIG.
In a structure such as that shown in FIG. 1, the fins are parallel to each other and perpendicular to
The surface Q of the fin 12 located at the center of the fin 2 is configured to pass through this shutoff operation area.

8 and 9 are diagrams showing the magnetic elements in the shut-off activation area, and with reference to these figures and the above-mentioned figures, it can be seen that the magnetic blowing device has at least one blowing device passing outside the shut-off activation chamber 50. It has a conductive member 20, for example, located outside the parallel insulating side plates 49, 51 and extending substantially parallel to the plane P in which the movable contact 5 moves, as can be seen from FIGS. 4 and 8. It is provided on two surfaces R and R'. This conductive member is connected to the region 21 of the first deflector 4 in which the fixed contact 1 is mounted, ie to one end 22 of the second extension. The end portion 22 is an extension of the region 21, and preferably extends in the opposite direction to the fins for reasons described later.

In the first part 18 which is continuous with the point connected to the end part 22, the conductive member 20 is provided so as to surround it outside the interrupting operation area, thereby forming a current loop (ABCDE) due to the arc,
Passage 1 located outside the passage 15 followed by the arc base on the slope 10 of the second deflector
4, the curved portion 23 is formed such that the portion 16 extends opposite the main body portion 17 of the fin.

The importance of such a configuration is illustrated by the results obtained by the interaction of the arc current and the current flowing in the conductive members of the loop.

As shown in FIG. 1, the presence of current loops A, B, C, D, and E is caused by the field generated by the small loops included between 18, 22, 21, 40, and 5 in the interrupting operation region 11 where the arc 40 occurs. It can be seen that the arc is moved in the direction of the fin. As soon as the arc obtained by the electromagnetic blowing action of the preceding arc creates an arc-based path on the surface of the second deflector section 10, the path 15 along the deflector is created by the path 14, 18,
22, 21, 9, 41, 15 and 25, the base is subjected to an electromagnetic force that shifts it upward in FIG. As a result, in the case of a single break contact, the movable contact support member 33
In the case of two break contacts, a closed loop is again formed via conductive elements 52 which are each connected to the second deflector through element 24 (FIG. 2).

As the associated arc base moves along the second deflector, other arc bases will also move along the first deflector until the arcs separate above the branch 19 of the fin 32. If the portion 16 is installed opposite the branch portion, the arc will become parallel to that portion and become stable, and will not penetrate into the interior of the fin, reducing the cooling capacity. By mounting the portion 16 of the conductor 20 opposite the body of the fin, the arc is allowed to rise up to the air gap 42 divided by the body of the fin, separating the arc for better cooling. It becomes possible.

The device of the invention also applies to a device with two break contacts as shown in FIG. 2, where equivalent parts to those in FIG. 1 are designated with the same reference numerals. The two chambers 30, 30' are similar to those described above;
It includes one of two movable contacts 5, 35 each carried by a contact bridge 34 which is movable along F ₁ together with an insulating contact carrier 31. The protruding tips 28, 29, which are close to the bridge contacts 5, 35, respectively, are directed toward the end 25 of the second deflector 6 to facilitate movement of the arc base.

Second deflector end 25 of chamber 30
must be electrically connected to the end 25' of the second deflector 6' of the chamber 30'. A cross member 24 connects these two ends and has two openings 26, 27 into which the two tips can be inserted.

The cross member 24 is provided so that its center is parallel to the contact bridge and passes under it,
It is connected to the ends 25, 25' by two inclined parts 36, 37 provided with the above-mentioned openings.

These slopes form an angle γ with respect to the direction F or F ₁ and extend from the ends 25, 25' at an angle of approximately 90° with the intermediate slope 10 of the second deflector, forming areas on either side of the opening. the generation of a parasitic magnetic field having a direction such that the current flowing through 36, 37 along the second deflector acts as a deterrent to the arc base at the moment of its departure or causes the termination of the arc base on the end 25; This is to prevent

The arrangement described above is equally applicable to devices with a single isolation chamber as shown in FIGS. are connected.

FIG. 3 is a cross-sectional view of a device with a single breaking contact where the fins 32' are not parallel and are oriented radially with respect to the breaking area. In this case, the first and second deflectors 4', 6' do not have parts equivalent to the ends 2, 7 described in FIG.

When increasing the arc voltage by dividing it into multiple parts, it is necessary to increase the number of fins. In this case, the fins 3 and 8 at both ends of the series of fins 32 are connected to the base 43 (the first
The arms 38, 39 of the bifurcation are located at a distance from the two deflector parts 9 and 10 such that they cannot reach up to the point (see FIGS. 3 and 4).

In order to provide the deflector with sufficient separation, at least the arm 3 of the fins 3 and 8 must be
Try to shorten 8,39.

The connecting parts 48, 54 between the deflector parts 2 and 9, 7 and 10 can be arcuate, so that they lie essentially on an extension of the base 43 of the branch 19.

You can also make all the ends of the fins the same,
It is also possible to promote the arc base; in such a case, at least one deflector 4, for example, the first deflector 4, is formed of a flat conductor 53 as shown in FIGS. 6 and 7. As shown in the figure, this flat conductor is cut out of a sheet metal having a small surface thickness in the plane P.

Finally, as shown in FIGS. 8 and 9, a U-shaped magnetic member 44 can also be provided in the cutoff operating area 11. Arm portions 46 and 45 of this U-shaped member
is substantially located within the planes R and R' and has a length l ₁ or l ₂ , and the base 47 connecting these two arms is located outside the area 11 and faces, for example, the stationary contact. It's located like that. By providing this U-shaped magnetic member 44, lines of magnetic force generated by arc current can be guided to the interrupting operation area 11.
This has the effect of generating a sufficiently strong magnetic field in the chamber 50 containing the arc base and making it easier to move the arc base toward the plurality of fins 32.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of an arc chamber passing through the moving surface of the movable contact, Fig. 2 is a sectional view of a disconnection device using a contact bridge with two break contacts and two arc chambers, and Fig. 3 is a sectional view of the fins in parallel. A schematic cross-sectional view of the device in the case where the
A side view of the device shown in the figure with the second deflector and movable contact removed; Figure 5 is a diagram showing the shape of the fins adjacent to the deflector; Figures 6 and 7 are diagrams showing the special shape of the deflector. , 8th
FIG. 9 and FIG. 9 are diagrams showing how the magnetic element is attached in the cut-off operation area. Explanation of symbols of main parts, 1...Fixed contact, 4,
6...Deflector, 5...Movable contact, 9,10
... Inclined part, 11 ... Shutoff operation area, 20, 2
0'...Loop, 32...Fin, 34...Contact bridge.

Claims (1)

[Scope of Claims] 1. A contact support member that supports a fixed contact and a movable contact and moves the movable contact along a predetermined direction on a predetermined plane from a contact position with the fixed contact to a non-contact position. , a plurality of fins each arranged at right angles to the predetermined plane and spaced apart from each other; a blow-in group electrically connected to the fixed contact; and one of the fins located on the outside of the plurality of fins. A current interrupting device comprising a first deflector comprising a first extension part facing the fin, a second extension part supporting the fixed contact, and an intermediate inclined part connecting the first extension part and the second extension part. a first elongated portion facing the other outer fin of the plurality of fins, an end portion of the movable contact located near the non-contact position, and the first elongated portion and the end portion; A second deflector comprising a connected intermediate inclined portion and electrically connected to the contact support member sandwiching the plurality of fins from the first deflector.
the first deflector and the second deflector are disposed opposite to each other, and the intermediate inclined portions of the first deflector and the second deflector are converged toward a breaking operation area formed between a contact position and a non-contact position of the movable contact. A blocking chamber 50 is formed following the blocking region and accommodating the fins, and the blow-in group is arranged in a plane parallel to the predetermined plane and outside the plurality of fins. at least one electrical conductor, the electrical conductor is connected to the second extending portion of the first deflector on the distal end side of the fixed contact and on the opposite side of the plurality of fins across the cut-off operation area. a first portion 18 arranged, a second portion 16 arranged on a plane intersecting the plurality of fins and near the plurality of fins;
and an intermediate portion 14 connecting the second portion, and the intermediate portion 14 of the blow-in loop is arranged parallel to the intermediate slope 15 of the second deflector and opposite to its external surface. A current interrupting device characterized by: 2. Each of the plurality of fins 32 is arranged parallel to each other, and each of the first and second deflectors 4, 6 has a first extending portion 2, 7 parallel to the fin, and a second extending portion parallel to the fin. 1 extending portion and the intermediate inclined portion, and these curved connecting portions are substantially coplanar with the base 43 of the branch portion 19 of the fin. An apparatus according to claim 1, characterized in that: 3. The device according to claim 1, wherein the plurality of fins 32' are arranged radially such that branching portions of the fins face toward the cutoff operating region 11. 4. From the end portion 25 of the second deflector 6 close to the cut-off operating area 11, the intermediate inclined portion and 90
A section 36 extending at an angle of .degree.
an opening 2 through which a protruding tip 28 provided at the end of 3 passes;
6. Apparatus according to any one of claims 1 to 3, characterized in that the device comprises: 6. 5 Branch portions 19 of each of the outer fins 3 and 8 of the plurality of fins near the first and second deflectors are separated from the first and second deflectors by a predetermined distance so that the arc base does not come into contact with these fins. The device according to any one of claims 1 to 4, characterized in that the device is formed short so as to be separated by a distance. 6 At least the first deflector 4 is a sheet metal 53 having a thin surface parallel to the moving plane P of the movable contact.
Device according to any one of claims 1 to 4, characterized in that it is formed from. 7 a fixed contact, a contact support member that supports a movable contact and moves the movable contact along a predetermined direction on a predetermined plane from a contact position with the fixed contact to a non-contact position; a plurality of fins disposed at right angles to and spaced apart from each other; a blow-in group electrically connected to the fixed contact; A current interrupting device comprising a first deflector comprising a first extending portion, a second extending portion supporting the fixed contact, and an intermediate inclined portion connecting the first extending portion and the second extending portion, the current interrupting device comprising: a first extension part facing the other fin on the outside of the fin; an end part of the movable contact located near the non-contact position; and an intermediate inclined part connecting the first extension part and the end part. A second deflector, which is electrically connected to the contact support member, is connected to the first deflector with the plurality of fins in between.
the first deflector and the second deflector are disposed opposite to each other, and the intermediate inclined portions of the first deflector and the second deflector are converged toward a breaking operation area formed between a contact position and a non-contact position of the movable contact. A blocking chamber 50 is formed following the blocking region and accommodating the fins, and the blow-in group is arranged in a plane parallel to the predetermined plane and outside the plurality of fins. at least one electrical conductor, the electrical conductor is connected to the second extending portion of the first deflector on the distal end side of the fixed contact and on the opposite side of the plurality of fins across the cut-off operation area. a first portion 18 arranged, a second portion 16 arranged on a plane intersecting the plurality of fins and near the plurality of fins;
and an intermediate portion 14 connecting the second portion, the intermediate portion 14 of the blow-in loop being arranged parallel to the intermediate slope 15 of the second deflector and opposite to its outer surface. and two identical pairs comprising said blow-in loop, said fin and said interrupting actuating chamber extend in pair from a common contact bridge 34 comprising said contact carrying member and an end of said second director. Common part 2 following parts 36 and 37
A current interrupting device characterized in that the current interrupting device is connected by four. 8 a fixed contact, a contact carrying member that supports a movable contact and causes the movable contact to move along a predetermined direction on a predetermined plane from a contact position with the fixed contact to a non-contact position; a plurality of fins disposed at right angles to and spaced apart from each other; a blow-in group electrically connected to the fixed contact; A current interrupting device comprising a first deflector comprising a first extending portion, a second extending portion supporting the fixed contact, and an intermediate inclined portion connecting the first extending portion and the second extending portion, the current interrupting device comprising: a first extension part facing the other fin on the outside of the fin; an end part of the movable contact located near the non-contact position; and an intermediate inclined part connecting the first extension part and the end part. A second deflector, which is electrically connected to the contact support member, is connected to the first deflector with the plurality of fins in between.
the first deflector and the second deflector are disposed opposite to each other, and the intermediate inclined portions of the first deflector and the second deflector are converged toward a breaking operation area formed between a contact position and a non-contact position of the movable contact. A blocking chamber 50 is formed following the blocking region and accommodating the fins, and the blow-in group is arranged in a plane parallel to the predetermined plane and outside the plurality of fins. at least one electrical conductor, the electrical conductor is connected to the second extending portion of the first deflector on the distal end side of the fixed contact and on the opposite side of the plurality of fins across the cut-off operation area. a first portion 18 arranged, a second portion 16 arranged on a plane intersecting the plurality of fins and near the plurality of fins;
and an intermediate portion 14 connecting the second portion, the intermediate portion 14 of the blow-in loop being arranged parallel to the intermediate slope 15 of the second deflector and opposite to its outer surface. and a U-shaped ferromagnetic element 44 is arranged outside the chamber 50, said ferromagnetic element being arranged in parallel lines extending substantially along the loop planes R, R′ around said cut-off activation area. A current interrupting device characterized by having two arms 45 and 46 and a common base 47 provided opposite to the fixed contact 1.