JPH088118A - Transformer for resistance welder - Google Patents

Abstract

PURPOSE:To provide a cooling means having a simple structure for cooling a welder transformer. CONSTITUTION:A primary coil 20, a secondary coil 25 and radiating plates 30 and 32 are coupled and an electric insulation and thermal connection are ensured by thermally conductive insulation plates 34, etc., and the radiating plates 30 and 32 are coupled with a radiating frame whereby heat passages extending from the coils 20 and 25 to the radiating frame are formed and thus the heat generated in the coils 20 and 25 never stays in a transformer for a resistance welder.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling means for a resistance welding machine transformer.

[0002]

2. Description of the Related Art A primary coil and a secondary coil are fitted onto an iron core, an input voltage is applied to the primary coil, an output voltage and an output current are taken out from the secondary coil, and the output is connected to a resistance welding machine. In order to cool the heat generated from the primary coil and the secondary coil in the transformer for the resistance welding machine, the secondary coil is conventionally formed in a tubular shape, and the cooling water is circulated inside the secondary coil. Was there.

[0003]

In the above-mentioned conventional cooling means, the secondary coil becomes complicated and the molding becomes complicated, the structure becomes complicated, the cost becomes high, and the transformer is used. However, since cooling water is indispensable, it is necessary to install a water circulation mechanism, a cooling water cooling device, and the like, and a water facility is required in the factory.

The present invention eliminates the drawbacks of such conventional arrangements.

[0005]

According to the present invention, a primary coil and a secondary coil are fitted onto an iron core, an input voltage is applied to the primary coil, and an output voltage and an output current are extracted from the secondary coil. In a transformer for a resistance welding machine in which the output is connected to a welding machine, the primary coil, the secondary coil, and the heat sink are connected to each other while ensuring electrical insulation and thermal connection, and the heat sink is It is characterized in that it is connected to a heat radiating frame made of a heat conductor forming a part of the transformer casing.

Further, in such a structure, the primary coil, the secondary coil, and the radiator plate are laminated along the iron core via the thermally conductive insulating plate to secure electrical insulation and thermal connection, thereby conducting heat conduction. It is possible to propose a configuration in which the heat dissipation plate is configured and the heat dissipation plate is connected to a heat dissipation frame formed of a heat conductor that forms a part of the transformer casing.

Furthermore, the heat radiation fins may be fixed to the peripheral surface of the heat radiation frame.

[0008]

The voltage applied to the primary coil is stepped down in inverse proportion to the number of turns, is output as a low-voltage large current from the secondary coil, and is applied to a resistance welding machine or the like. In this process, high heat is generated in the primary coil and the secondary coil, but the primary coil and the secondary coil are thermally connected to the heat radiating frame via the heat radiating plate, so that a heat conducting path is formed. It Then, the heat is dissipated to the outside through the heat dissipation frame.

In such a structure, by fixing the heat radiation fins to the peripheral surface of the heat radiation frame, heat can be more efficiently dissipated to the outside by the heat radiation fins. Thus, each coil is air-cooled, and cooling water is unnecessary.

[0010]

1 to 4 show a transformer 1 for a resistance welding machine according to the present invention.

Here, a rectangular parallelepiped core frame body 2 is provided at the center thereof. This iron core frame 2 is, as shown in FIG.
It is composed of a peripheral frame portion 3 and an iron core 4 provided so as to traverse the inside thereof, and mounting voids 5 and 5 are formed above and below the iron core 4. A heat radiating frame 6 including a mounting flange 7 and a peripheral frame 8 having a rectangular cross-section is formed on the front portion of the iron core frame 2, and a heat radiating frame 6 made of a heat conductor opening in the front and rear is disposed in the peripheral frame part 3. Similarly, a frame-shaped electrode frame 10 is similarly arranged at the rear portion thereof, and is assembled by a screw rod 11 (see FIG. 2). Thus, the peripheral frame portion 3, the heat radiation frame 6 and the electrode frame 10 constitute a transformer housing 12.

On the other hand, as clearly shown in FIG. 5, three primary coils 20 and two secondary coils 25 are mounted in the mounting gaps 5 and 5 and fitted onto the iron core 4. However, a known transformation effect will occur. The configuration will be described in more detail. The iron core 4 is formed in a predetermined shape by stacking a number of thin plates as shown in FIG.

The iron core 4 has a radiator plate 30, a primary coil 20, a secondary coil 25, and a radiator plate 3 in order from the left of FIGS.
2, primary coil 20, secondary coil 25, primary coil 20
And the heat dissipation plate 30 closely contact each other in the width direction via the heat conductive insulating plate 34, and are thermally connected in the width direction as a whole,
The heat conductive laminated body 35 is configured.

Each structure will be described.

As shown in FIGS. 3 and 5, the primary coil 20 is formed by winding a band-shaped copper plate in a ring shape several tens of times, and connecting the inner end of the band-shaped copper plate to the connecting terminal piece 21.
The adjacent ones are connected to each other by using the connection terminal pieces 21, and the extraction ends of the primary coils 20 on both sides thereof are used as the primary side input / output ends.
Connect to an external power supply inside.

On the other hand, the secondary coil 25 has a horseshoe shape, and as shown in FIGS. 2 and 5, the upper end of the left secondary coil 25 is provided with an electrode plate 3 having a square connecting portion on the front end face.
5 is inserted into the connection groove 35a and connected to the electrode plate 35,
The lower end of the right secondary coil 25 is connected to the electrode plate 36 of the same shape by fitting it into the connection groove 36a.
The other end of 25 is connected to the connection conductor 37 by fitting into the connection grooves 37a, 37b, and the secondary coils 25, 25
Thus, a coil structure in which the periphery of the iron core 4 is wound twice is formed. And such secondary coils 25, 25
The low voltage and large current output stepped down by the
5, 36, and is connected to an external electric circuit as a power source for the welding machine.

The heat radiating plates 30, 30 are horseshoe-shaped with their rear sides open, and a mounting flange 31 projecting laterally is fixed to the front of the heat radiating plates 30. The peripheral frame 8 is abutted and fixed.
Further, the heat dissipation plate 32 in the central portion is also horseshoe-shaped, and mounting flanges 33, 33 are fixed to the upper and lower edges thereof, and similarly fixed to the peripheral frame 8.

The heat conductive insulating plate 34 is a thin annular piece having a thickness of about 0.5 mm and is made of glass cloth or the like, and has electrical insulation and thermal conductivity. Although only one sheet is shown in FIG. 5, as described above, each sheet is interposed between the members forming the heat conductive laminate 35.

Each member is composed of the heat conductive insulating plate 3
The heat conducting laminates 35 are connected to the heat radiating frame 6 by the heat radiating plates 30 and 32.

On the other hand, on the four side surfaces of the peripheral frame 8 of the heat radiation frame 6, as shown in FIGS.
A plurality of 7 are fixed. As shown in FIG. 7, the heat radiator 37 has a structure in which a plurality of heat radiation fins 38 project in parallel from the substrate.

Thus, the heat radiation fins 3 are provided on the peripheral surface of the peripheral frame 8.
8, the heat generated in the primary coil 20 and the secondary coil 25 is conducted to the heat radiating frame 6 via the heat radiating plate 30 and the heat radiating plate 32, and the heat radiating fin 3
8 is emitted to the outside. For this reason, heat is not accumulated in the resistance welding machine transformer 1, and the heat is dissipated by the above-mentioned heat conducting path by a simple means.

In this construction, the heat conductive insulating plate 3
The primary coil 20, the secondary coil 25 and the heat radiating plates 30 and 32 are laminated through the wiring 4 to secure electrical insulation and thermal connection. The plates 30, 32 may be coated with a thermally conductive insulating coating to ensure electrical insulation and thermal connection.

[0023]

According to the present invention, the primary coil 20, the secondary coil 25 and the heat radiating plates 30 and 32 are connected to each other while ensuring electrical insulation and thermal connection by the heat conductive insulating plate 34, etc.
Since 0 and 32 are connected to the heat dissipation frame 6 made of a conductive material, a heat conducting path from the coils 20 and 25 to the heat dissipation frame 6 is formed, and the heat generated in the coils 20 and 25 is in the transformer 1 for the resistance welding machine. I don't have a fever. Further, when the heat radiation fins 38 are fixed to the peripheral surface of the heat radiation frame 6, the heat radiation area is increased and the heat can be more effectively dissipated. For this reason, the structure of the secondary coil 25 is simplified, molding is facilitated, cooling water is not required, and its circulation mechanism and cooling mechanism are not required, resulting in an excellent effect such as a simple structure. There is.

[Brief description of drawings]

FIG. 1 is a side view of a transformer 1 for a resistance welding machine according to the present invention.

FIG. 2 is a front view of a resistance welding machine transformer 1.

FIG. 3 is a partially cutaway side view of a transformer 1 for a resistance welding machine.

FIG. 4 is a right half taken along line AA of FIG. 3 and a left half taken along B of FIG.
It is sectional drawing cut | disconnected and shown by the -B line.

5 is an exploded perspective view of a heat conductive laminate 35. FIG.

FIG. 6 is an exploded perspective view of the transformer housing 12.

FIG. 7 is a side view of a heat radiator 37.

[Explanation of symbols]

 4 iron core 6 heat dissipation frame 10 electrode frame 12 transformer housing 20 primary coil 25 secondary coil 30 heat dissipation plate 32 heat dissipation plate 34 heat conductive insulating plate 35 heat conductive laminate 38 heat dissipation fin

 ─────────────────────────────────────────────────── ─── Continuation of the front page (71) Applicant 390014535 New Technology Corporation 4-8-8 Honmachi, Kawaguchi City, Saitama Prefecture (74) Attorney Matsuda Kitao (72) Inventor Sobue Naoichi 2-1-1 Toyota-machi, Kariya-shi, Ltd., Toyota Industries Corp., Ltd. (72) Inventor Takashi Niwa 2-1-1, Toyota-machi, Kariya-shi, Aichi Ltd. (72) Inventor, Toyota Industries Corp. Kin Aoki (1) 4-chome, Juichibancho, Nakagawa-ku, Nagoya-shi Kimura Denki Mfg. Co., Ltd. (72) Inventor Takuji Nishikawa 4-chome, 10-bancho, Nakagawa-ku, Nakagawa-ku, Nagoya

Claims (3)

[Claims] 1. A primary coil and a secondary coil are fitted onto an iron core, an input voltage is applied to the primary coil, an output voltage and an output current are taken out from the secondary coil, and the output is connected to a welding machine. In the resistance welding machine transformer configured as described above, the primary coil, the secondary coil, and the radiator plate are connected to each other while ensuring electrical insulation and thermal connection, and the radiator plate constitutes a part of the transformer casing. A transformer for a resistance welding machine, which is connected to a heat dissipation frame made of a heat conductor. 2. A heat conductive laminate is constructed by stacking a primary coil, a secondary coil and a heat radiating plate along an iron core via a heat conductive insulating plate to secure electrical insulation and thermal connection. The transformer for a resistance welding machine according to claim 1, wherein the heat radiating plate is connected to a heat radiating frame made of a heat conductor forming a part of a transformer casing. 3. The transformer for a resistance welding machine according to claim 1 or 2, wherein a radiation fin is fixed to the peripheral surface of the radiation frame.