JP2938705B2 - DC magnetic field application device for annealing furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a DC magnetic field applying apparatus for an annealing furnace for annealing a core of an amorphous magnetic alloy in a magnetic field in order to improve magnetic properties of the core.

[0002]

2. Description of the Related Art Relatively small-capacity transformers mainly used for pole transformers, particularly transformer cores using amorphous magnetic alloy ribbons, have sufficient magnetic properties of low loss. The dew point and the oxygen concentration are controlled so as not to exceed predetermined values in a nitrogen gas atmosphere, and annealing is performed while applying a DC magnetic field. In order to perform annealing under such conditions, a conventional annealing apparatus is provided with a heating chamber 30 and a vacuum pressure recovery chamber 31 partitioned by doors 3a and 3b as shown in FIG.
The tray 33 having the transformer core 32 mounted at a predetermined position on the carriage 3 and the carriage 34 and the carriage 34 are sent to the vacuum recompression chamber 31, and the interior of the room is decompressed with nitrogen gas except for oxygen and moisture by evacuating. Thereafter, the heating chamber 3 continuously connected to the vacuum pressure recovery chamber 31
Send to 0. At this time, in order to prevent oxygen and moisture from entering the heating chamber 30 from the outside, the inside of the heating chamber 30 is made airtight to some extent, and then nitrogen gas is supplied to keep the inside of the heating chamber 30 at a positive pressure. Next, the transformer core 3
2, the electrode rod 36 provided in the heating chamber 30 is inserted by the electrode rod elevating device 35 so as to pass through the window of the transformer core 32, and is connected to the lower electrode 37. The electrode rod 36
A DC current from a DC power supply 38 through a wiring 39
Annealing is performed while applying a DC magnetic field.

[0003]

The above-mentioned conventional annealing furnace needs to be equipped with equipment such as an elevating device for inserting an electrode rod for applying a DC magnetic field, and the annealing equipment is complicated. SUMMARY OF THE INVENTION An object of the present invention is to provide a DC magnetic field applying apparatus for an annealing furnace in which an electrode rod can be inserted into a wound core outside a furnace, and the insertion operation is easy.

[0004]

In order to achieve the above-mentioned object, according to the present invention, a winding core is mounted on a base movable in and out of an annealing furnace, and an electrode rod is mounted on a window of the winding core. Insert a DC current from a DC power supply device disposed outside the annealing furnace to the electrode rod, in the DC magnetic field applying device of the annealing furnace to perform an annealing process on the wound core by heating means in a DC magnetic field, A plurality of connection terminals are juxtaposed on the base, and two of these connection terminals are connected to input terminals that are detachable from electrode terminals connected to the DC power supply, respectively. The remaining connection terminals are connected by connecting conductors between two adjacent connection terminals.
Plural sets to form those connected by two Te, the plurality of sets
Connection terminal to which the connection terminal and the input terminal are connected
A plurality of electrode rods for connecting the electrodes in series,
Standing up and down on the connection terminal so as to be detachable , outside the annealing furnace, the electrode rod is inserted into the connection terminal so as to pass through the window of the wound core, and the input terminal and the connection terminal are all connected. After being connected in series, the input terminal is connected to the electrode terminal inside the annealing furnace.

[0005]

With the above construction, not only the work of mounting the electrode rod on the wound core on the base using a crane or other factory equipment outside the furnace, but also the electrode rod can be connected to the connection terminal. Since the input terminals and the connection terminals are all connected in series by being inserted into the, the annealing of all the iron cores in the annealing furnace can be performed by one DC power supply without forming a parallel circuit. And the airtightness of the annealing furnace
Can be reliably held .

[0006]

FIG. 1 shows a transformer core loading apparatus 1 in which a number of transformer cores are loaded and carried into a furnace, in which six upstanding electrode rods are arranged. As shown in the figure, the base 10 located below is configured such that a frame is appropriately provided with a cross bar so that a heavy object can be loaded. This base 10
On one side, two terminals 11 for connecting a power supply,
12 is fixed so as to protrude in the horizontal direction. This terminal 1
Connection terminals 14a and 14b, which are configured to be detachably connectable to electrode rods described later via conductors 13a and 13b, are connected to the bases 1 and 12, respectively, and are fixed on the base 10.

On the base 10, a pair of connecting conductors 16 are further provided.
a and 16b are juxtaposed. This connection conductor 16a (1
6b) are connection terminals 15a, 15b (15c, 15d) configured so that electrode rods can be detachably connected to both ends.
Is provided. The above-described electrode rod is formed by bending a copper round rod into a U-shape, and includes three electrode rods 18a, 18a.
8b and 18c. These electrode rods are connected to the above-described connection conductors so that the whole is electrically in a series circuit.
That is, the electrode rod 18a connects the connection terminals 14a and 15a, the electrode rod 18b connects the connection terminals 15b and 15c, and the electrode rod 18c connects the connection terminals 14b and 15d. When connected in this way, six electrode rods connected in series are formed in a vertical direction. The connection terminals 15a, 15b (1
5c, 15d) have an upward opening, have sufficient heat resistance in which the electrode rod inserted in this opening is wound around the opening, and are configured to be fixed by being tightened by a tough spring. Reference numeral 19 denotes a tray which is supported on the base 10 so as to be located in the middle of the vertically arranged electrode rods, so that the number of stages can be selected according to the number of iron cores to be loaded.

FIG. 2 shows a transformer core 32 mounted on the base 10 described above.
FIG. 6 is a plan view of the annealing furnace 5 in which the electrode rods 18a, 18b, and 18c are inserted and loaded with the electrodes. As shown in the drawing, the annealing furnace 5 is provided with vacuum penetration bushings 53 and 54 for drawing electric current from outside the annealing furnace 5 to a vacuuming tank 52 forming a heating chamber, and the input terminal 11 of the base 10 is provided. , 12 are connected to the vacuum penetration bushings 53, 54, respectively, and the transfer table 58 for loading the transformer core loading device 1 into the furnace is evacuated. Evacuation device 59 for
a, a pressure reducing device 59b for feeding nitrogen gas into the furnace, a cooling device 59c for sending cooling water to the annealing furnace during cooling, and an electric heater 59d for heating the inside of the furnace.

The operation will be described below. Transfer stand 58 outside the furnace
Above, the transformer core 32 is placed at a predetermined position on the tray 19 of the transformer core loading device 1, and the tray 19 is placed on the base 10, and the electrode rods 18a, 18b, 18c are moved to the respective trays.
The electrode rod 18a passes through the window of the transformer core 32 placed at a predetermined position of 19 and is connected to the connection terminals 14a and 15a.
The electrode rod 18b is connected to the connection terminals 15b and 15c.
c is connected to the connection terminals 15d and 14b. Then, the transformer core loading device 1 is transferred into the annealing furnace 5 by the transfer table 58, and the input terminals 11 and 12 provided on the base 10 are connected to the electrode terminals 55 and 56 provided in the annealing furnace 5, After closing the door 51, the inside of the furnace is evacuated by a vacuum exhaust device 59a to remove moisture and oxygen, and the pressure is restored by a nitrogen gas by a pressure-reducing device 59b, and then externally connected to the electrode rods 18a, 18b, and 18c. A DC current is supplied by the DC power supply device 57, and the electrode rods 18a, 18
b, 18c to generate a DC magnetic field around the transformer core 3
2 is annealed by heating it to a predetermined temperature with an electric heater 59d in a DC magnetic field.

[0010] In the above embodiment, the electrode rod is formed by bending it into a U-shape. However, a connection metal fitting is provided at a bent portion of the U-shape to form a straight electrode rod into a U-shape. In other words, it is only necessary to be electrically connected, for example, by connecting the tops of the upright bars with a cable. The connection between the input terminals 11 and 12 and the power supply 57 can be made by connecting the terminals directly to the furnace door and connecting them directly as described above.
The connection may be made using a cable.

[0011]

As described in detail above, according to the present invention,
The work of inserting the electrode rod into the wound core can be performed outside the annealing furnace. Also, since the input terminals and the connection terminals are all connected in series by inserting the electrode rods into the connection terminals, the annealing of all the iron cores in the annealing furnace can be performed without forming a parallel circuit. It can be performed with a DC power supply , and the airtightness of the annealing furnace can be reliably maintained .

[Brief description of the drawings]

FIG. 1 is a perspective view of a DC magnetic field application device according to an embodiment of the present invention. .

FIG. 2 is a plan view of an annealing furnace into which the DC magnetic field applying device of FIG. 1 is loaded.

FIG. 3 is a sectional view showing an example of a conventional annealing furnace.

[Explanation of symbols]

Reference Signs List 1 transformer core loading device 5 annealing furnace 10 base 11, 12 input terminal 13a, 13b, 16a, 16b connection conductor 14a, 14b, 15a, 15b, 15c, 15d connection terminal 18a, 18b, 18c electrode rod 19 tray 32 Transformer iron core 51 door

──────────────────────────────────────────────────続 き Continuation of the front page Examiner Tomohiro Sakai (56) References JP-A-4-259326 (JP, A) JP-A-61-20309 (JP, A) JP-A-58-81924 (JP, A) ( 58) Field surveyed (Int.Cl. ⁶ , DB name) H01F 41/02 C21D 1 / 26,6 / 00

Claims (1)

(57) [Claims] 1. A winding core is mounted on a base movable in and out of an annealing furnace, and an electrode rod is inserted into a window of the winding core.
A direct current is passed from a direct current power supply device disposed outside the annealing furnace to the electrode rod, and in a direct current magnetic field applying device of an annealing furnace for performing an annealing treatment on a wound core by a heating means in a direct current magnetic field, A plurality of connection terminals are juxtaposed, and two of the connection terminals are connected to input terminals that can be attached to and detached from electrode terminals connected to the DC power supply, respectively, and the remaining connection terminals Are connected to each other by connecting two adjacent connection terminals with connection conductors.
And a plurality of sets of connection terminals and the input terminals are connected.
A plurality of electrodes respectively connecting the connection terminals in series
A rod is detachably mounted on the connection terminal, and the electrode rod is inserted into the connection terminal outside the annealing furnace so that the electrode rod passes through a window of the wound core, and the input terminal and the input terminal are connected to each other. A DC magnetic field applying apparatus for an annealing furnace, wherein after the connection terminals are all connected in series, the input terminal is connected to the electrode terminal inside the annealing furnace.