JPS61267295A - Vanish hardening apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a heat treatment device that uses microwaves as a heating source during preheating before varnish treatment of electrical machinery windings, etc., and during varnish drying after varnish impregnation. [Prior Art] In general, in electrical machinery windings, in order to improve insulation properties and vibration resistance, varnish is impregnated and hardened to seal between and between the wound T co-enamel wires. Is it necessary to fix insulating paper, etc. Usually, before impregnating with varnish, in order to remove the distortion remaining in the coating of the wound enameled wire,
Heat to 50°C. The temperature at which impregnated varnish is dried is also 100 to 50°C, and a hot air circulating oven is usually used as the heating device for these.

In this case, the constituent members of the device are not locally subjected to abnormal heating.

However, when microwaves are used as heating energy during such heat treatment, electrical discharge may occur in the wheels and rails of the cart on which the electric windings are placed, resulting in abnormal heating, and sparks from the electrical discharge may ignite the varnish paper. There is a risk of Next, this phenomenon will be explained.

FIG. 6 shows a single heating device using microwaves as the heating energy key. With this device in place, the microwave oscillator (1) is activated to generate one microwave.

It is introduced into the furnace (2) by a waveguide (3). Furnace (2)
Now, the stirrer fan (4) is rotated to uniformly disperse the introduced f microwaves, so that the stator of the rotating electric machine (
5) Microwaves will be applied to the surfaces of the core (6), coil (7), and lead wire (8) that constitute all the components from various directions. At this time, the core (6) and coil (7)
), a microwave surface current flows through the thinnest part of the surface layer, generating Joule heat. Then, this heat is transmitted to the coating of the enameled wire that is wound and removed, and the varnish that is impregnated and dried by the heat of the first part is dried. In this way, it is heated by Joule heat, but the enameled wire coating itself and the varnish itself also generate heat internally due to the dielectric heating phenomenon based on the microwave electric field, which naturally contributes to strain removal and drying of the varnish. do. Mafko microwave electric field is a trolley (9)
This also applies to the wheels αD, rails α, etc. that make up the platform Q (1), and especially if the wheels αD and rails Q2 are made of metal, there is a risk of electrical discharge occurring in the minute gaps between them. Therefore, one or both of these contact members must be insulating.Of course, the core (6
) and the stand αO, etc., an insulating plate α must be laid.

[Problem that the invention seeks to solve]

The conventional device is configured as described above, with a trolley (9)
Since the wheels 01) must be made of an insulating material such as synthetic resin, there are problems in that the wheels αυ are subject to significant wear and must be replaced periodically.

This invention was made to solve the above-mentioned problems, and the purpose is to obtain a heat treatment device that can use strong metal wheels and requires less maintenance. [First Means to Solve the Problem] The heat treatment apparatus according to the present invention provides a groove between the platform 00 of the cart (9) and the inner wall 0 of the furnace (2), and allows microwaves to pass through the groove. The electric field is obstructed, that is, the wheels 0η and the rails (
c) weaken the microwave electric field reaching the part;
This eliminates the risk of electrical discharge occurring between the wheels αη and the rail (2).

[Effect]

The heat treatment device in this invention is provided between the stand α0 and the inner wall, and the microwave is reflected by the T-groove, and the microwave electric field is so strong that it is difficult for the microwave to reach the wheel 01) and the rail α, resulting in electric discharge. Satonachinai. Therefore wheel α
It is not necessary to use an insulating material such as synthetic resin for the sword or the rail (2), and a highly durable device can be provided.

[Embodiments of the invention]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of the invention, FIG. 2 is a sectional view showing a side view of the invention, and FIG. 8 is a sectional view of FIGS. FIG. 2 is an enlarged T-section sectional view of part A of FIG.

In Figures 2 and 8, the groove OQ between the furnace wall and the trolley (
9) are provided on the side and rear surfaces. As for the front, the front door αυ and the trolley (9) are integrated to show a one-piece structure.In this case, gaps and grooves αQ are not provided, but if the structure is not an integrated structure, they will be provided around the entire circumference. 'Hereinafter, these gaps and grooves will be referred to as a chime structure.

To explain the configuration of the choke structure with reference to FIG. 4, first, the groove forming member αη, 08) is fixed to the stand αO with conductive paint applied to the contact surface with four screws. As a result, a gear valve OQ and a groove ring are formed between the furnace wall α force.

The gear and knob OQ that connects to the furnace wall are made of a single insulated guide 00 made of resin, etc. so that the dimension (d) is constant (although this is regulated) by the rail (2) of the trolley (9). is also regulated by this. Also, the rear area is regulated by a striker.

(a) With this configuration, dimensions a to f are determined so that when microwaves enter the gear, the knob αQ, and the groove T, the phase shifts by 80° within the groove. In other words, the intruding microwave (a) is canceled by the reflected microwave (b). The strength of the microwave electric field penetrating the gap α0 can be suppressed to several percent or less.

In the first embodiment shown here, the component α of the choke is
7) O8) (19 can be attached to the cart side, but it can also be attached to the furnace wall α→ side. Similarly, the insulating guide α can also be attached to the furnace wall side.

Depending on the structure of the furnace, such as a continuous furnace, a microwave leakage prevention contact with spring properties (see Figure 5) may be installed on the front or rear side of the cart or furnace wall, or the sides may have a choke structure. In some cases, 1 is better. The side surfaces of the tabs have a non-contact choke structure that wears out when the cart moves, and the front and rear surfaces have no damage to the contacts due to pressing.

Now, we will explain the varnish curing device, and it goes without saying that this device can be applied to a general dielectric heating microwave oven in which a cart is placed in the oven and achieve the same effect. [Effects of the Invention] According to the invention, it is safe because microwaves do not enter parts of the furnace that are at risk of causing electrical discharge.
Since metal can be used for structural members, it is inexpensive and durable.

[Brief explanation of drawings]

1 and 2 are cross-sectional views showing one embodiment of the present invention, and FIG.
The figure is a partially enlarged cross-sectional view, Figures 4 and 5 are cross-sectional views showing the use in combination with a contact, and Figure 6 is a schematic diagram showing a heating device using microwaves. (1000
g109 is a member that constitutes a gear/Ip and a groove, a fist is a groove, and a threat is a leakage prevention contact. In addition, in the figures, the same reference numerals indicate corresponding parts.

Claims (6)

[Claims] (1) A heating treatment apparatus using microwaves having a cart in the furnace, characterized in that a choke structure consisting of a gap and a groove is provided in a part or the entire circumference between the cart and the furnace wall. Processing equipment. (2) The heat treatment apparatus according to claim 1, wherein a choke structure is provided on the side surface of the cart, and leakage prevention contacts are provided on the front and rear surfaces. (3) The heat treatment apparatus according to any one of claims 1 and 2, characterized in that a choke structure or a leakage prevention contact is provided on the cart side. (4) The heat treatment apparatus according to claim 1, characterized in that a choke structure or a leakage prevention contact is provided on the furnace wall side. (5) In order to keep the gap size between the cart and the furnace wall constant, an insulating guide is provided outside the cart or outside the furnace wall and its position is regulated.
The heat treatment apparatus described in section. (6) In order to keep the gap size between the cart and the furnace wall constant, the size is regulated by the fitting size of the rail and the wheel and the positioning stopper.
The heat treatment apparatus described in Section 1.