JPS63302254A - Electric hot air blower - Google Patents

Abstract

PURPOSE:To reduce the number of parts in combining a heating means and an air blasting means in one by a method wherein a device is composed of a motor consisting of a stator and a rotor using ceramic insulated wires as coils, a fan, and a casing and equipped with air discharge openings. CONSTITUTION:A heat generating motor consisting of a stator 1 and a rotor 2 uses ceramic insulated wires as coils and a fan 4 is attached on the shaft 5 of the rotor 2 and covered by a casing 7. A mounting plate 10 is equipped with a plurality of fan-shaped air discharge openings 11 radially around a bearing 6 and the air stream from the fan 4 is forced to flow smoothly to the motor side. When the coils of the motor are energized by an external power source, the rotor 2 is rotated and the stator 1 and the rotor 2 wound with the coils generate heat. When the fan 4 is rotated by the torque of the rotor 2, and air flow is generated and air sucked from an air intake 8 flows into the gaps between the stator 1 and the rotor 2 through air discharge openings 11 of a mounting plate 10 to cool the stator 1 and the rotor 2 and the air itself is heated and flows out from the hot air discharge openings 12 of the casing 7 in hot blow.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to an electric hot air machine, and is applicable to dryers and heaters that use hot air, such as clothes dryers, futon dryers, chemical or biological dryers, It is effective when used in hot air heaters, hand dryers, hair dryers, dishwashers, electric kotatsus, electric stoves, etc.

BACKGROUND OF THE INVENTION Conventional hot air generators have separate air blowing means and heat generating parts, as seen in hair dryers, for example.The fan is rotated by an electric motor to generate air, and the air is then connected to an electric wire such as nichrome wire. The air passes through a heat generating section made of a resistor and is converted into warm air through heat exchange.

There is also a method (Japanese Utility Model Application Publication No. 50-67532) in which warm air after cooling the electric motor using a motor cooling plow is used to defrost the back window of an automobile.

Furthermore, recently developed ceramic insulated wires have high-temperature insulation properties.

The construction of this ceramic insulated wire is shown in FIGS. 3 to 5.

The wire shown in Figure 3 is called Fujithermo A (registered trademark), and is an unfired type that has both the characteristics of a ceramic insulated wire with excellent high-temperature insulation and the characteristics of a synthetic enamelled wire with excellent winding properties. Ceramic insulated wire.

When the wire is heat-treated at a high temperature after winding, the outermost film decomposes and disappears, and the inner insulating layer becomes a complete ceramic insulator.

Furthermore, by selecting the material of the conductor, the
It can be used in a temperature range of 8C, and the conductor materials include aluminum/constantan, nickel plated copper, silver, nickel/stainless steel clad copper, gold/platinum/platinum rhodium, etc.

The wire shown in FIG. 4 is called Fujithermo M (registered trademark), and is an unfired type ceramic insulated wire with excellent flexibility.

After winding, the wire is heat-treated at a relatively low temperature of 500 to 600°C, so that the insulator becomes completely ceramic, and the conductor material is nickel, stainless steel clad copper, nichrome, gold, platinum, or platinum-rhodium. In that case, it can be used for a long time at high temperatures of 600 to soo'c.

The product shown in FIG. 5 is called Fujithermo S (registered trademark) and is a complete ceramic insulator that has been fired at a high temperature, so no heat treatment is required when incorporating it into equipment. Nickel, nickel-clad copper, Inconel, alumel, chromel, etc. can be used as the conductor material, and can be used at a high temperature of usually 400 to 500°C.

Although the three types of ceramic insulated wires have been described above, these ceramic insulated wires have a characteristic that the wire resistance increases as the temperature rises.

C.8 Problems to be Solved by the Invention However, because conventional hot air generators are equipped with a heat source such as an electric heater separate from the blowing means, the number of parts increases, resulting in high costs. There were problems such as the inability to make the device itself compact.

In addition, a motor cooling block that cools the motor and then uses warm air for defrosting effectively utilizes the heat loss that inevitably occurs in the motor used as a power source for defrosting. However, conventional electric motors are not intended to generate heat, and it is desirable to reduce heat loss as much as possible. Therefore, it is not possible to generate such high heat from the heat lost in the electric motor, and when trying to increase the temperature of the hot air generated by reducing the amount of air for cooling the electric motor, conventional electric motors cannot generate such high heat. There was a problem in that the windings would burn due to the temperature rise and the motor itself would be damaged.

Furthermore, although ceramic insulated wires can be used in fields that require high-temperature resistance, there has been no attempt to actively use them in hot air generators.

The present invention focuses on the recently developed ceramic insulated wire and utilizes the ceramic insulated wire as a heat source that also serves as a power generation means, thereby solving the problems of the conventional technology and solving the problems that the ceramic insulated wire has. The purpose is to make effective use of these characteristics to generate hot air.

Furthermore, when the power generating means also serves as a heat source, there arises a problem that the bearings of the rotor become high temperature and are damaged, and it is an object of the present invention to solve this problem.

21. Means for Solving the Problems The present invention has the following configuration in order to solve the above problems.

In other words, the electric hot air fan of the present invention includes an electric motor including a stator and a rotor using ceramic insulated wires as windings, and a motor that is attached to the shaft of the rotor and the stator (and/or
or a rotor); a casing that covers the electric motor and the fan; and a mounting plate fixed to the casing, the casing facing the center of the fan. having a bearing for supporting the shaft of the rotor and an opening for air intake at a position;
The mounting plate is located between the electric motor and the fan, has a bearing for supporting the shaft of the rotor, and has an air discharge opening.

E, Example Next, embodiments of the present invention will be described based on the drawings.

FIG. 1 is a diagram showing an embodiment of the present invention.

The electric motor used in the electric warm air fan of the present invention is a heat generating electric motor that mainly uses heat generated by the electric motor rather than rotational torque,
For this purpose, the aforementioned ceramic insulated wires are used for the windings 3 and 3' wound around the stator 1 and rotor 2 of the motor.

The core material of the stator 1 and rotor 2 around which the windings are wound is silicon steel plate in order to minimize heat loss due to hysteresis loss and eddy current loss in ordinary electric motors, but the core material of the stator 1 and rotor 2 around which the windings are wound is silicon steel plate. In order to increase heat generation properties, ordinary iron plates are used as the core material.

In addition, the heat-generating motor of the present invention has ceramic insulated wire that is thicker than normal motor windings and is wound less than the normal number of turns, and the emphasis is placed on the heat generated by the motor rather than the rotational force of the motor. Suitable for generating warm air.

Furthermore, since this heating motor uses ceramic insulated wire as the winding, as the temperature of the winding increases, the insulation resistance increases and the current flowing through the winding is automatically reduced, reducing power consumption. At the same time, it is possible to prevent the temperature from rising excessively.

The shaft 5 of the rotor 2 is rotatably supported by bearings 6,6', and the fan 4 is attached to the shaft 5. Various types of fans can be used as the fan 4 depending on the usage conditions, but in this embodiment, a radial fan with an air intake in the center and sending airflow in the radial direction is used, and the fan blades are attached to the back panel. 4' to the shaft 5.

The electric motor and the fan 4 are covered by a casing 7, and the casing 7 is equipped with a bearing 6' that supports the shaft 5 of the rotor 2 at a position facing the center of the fan 4. A plurality of fan-shaped air intake openings 8 are provided radially around 6', and a hot air outlet is provided behind the motor! It is equipped with 2.

Furthermore, the stator 1 of the electric motor is fixed to the casing 7 via mounting plates 9 and 10, but the mounting plate lO is further extended inward of the casing, and the motor and the motor are connected via the mounting plate 10. A bearing 6 located between the fan 4 and the casing 7 is fixed.

Further, the mounting plate IO has a plurality of fan-shaped air discharge openings 11 radially around the bearing 6, so that the air flow from the fan 4 smoothly flows toward the motor side.

Although the embodiment shown in Fig. 1 shows a type of motor with windings on the stator and rotor (for example, a commutator motor), it is not necessarily necessary to stick to this type of motor, and a tubular induction motor may be used. It may be a type of motor that does not have a winding on the rotor side, such as the above, or it may be a type of motor that has a permanent magnet on the stator side and a winding on the rotor side.

In addition, in order to efficiently cool the stator or rotor around which the windings are wound, gaps or passages are provided in the core material around the stator or rotor windings to improve air flow. put.

Next, the operation of the present invention will be described based on this example.

When the windings of the motor are energized by an external power source, the rotor 2 rotates and the stator I and rotor 2 around which the windings are wound generate heat.

When the fan 4 is rotated by the rotational force of the rotor 2, an air flow is generated, and the air taken in from the air intake port 8 passes through the air discharge opening II of the mounting plate IO as shown by the arrow in FIG. , flows into the gap between stator I and rotor 2, and the stator! At the same time, the air itself is heated, becomes hot air, and flows out from the hot air outlet 12 of the casing 7.

Although the present invention has been described above based on embodiments, the present invention can be applied based on the technical idea of the present invention without being limited to these embodiments.

3. Effects of the Invention The present invention utilizes a ceramic disconnected electric wire as a heat source that also serves as a power generation means, so that the conventional heat generating means and air blowing means, which were separate, can now be replaced with one, reducing the number of parts. Therefore, costs can be reduced and the device can be made more compact.

In addition, in the present invention, since ceramic insulated wires are used as the windings of the electric motor, even if the electric motor actively generates heat, the windings will not burn like in conventional motors. As the temperature of the winding increases, the wire resistance increases and the current flowing through the winding is automatically reduced, reducing power consumption and preventing excessive temperature rise.

Furthermore, in the present invention, the rotor bearing, which is most affected by heat, is provided upstream of the heating motor and is constantly cooled by air flow, so that damage to the rotor bearing can be prevented.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view showing an embodiment of the present invention, and FIGS.
FIG. 4 is a diagram showing the structure of the ceramic insulated wire.

Claims (2)

[Claims] (1) An electric motor consisting of a stator and a rotor using ceramic insulated wires as windings, and an air flow attached to the shaft of the rotor to cool the stator (and/or rotor). It consists of a fan, a casing that covers the electric motor and the fan, and a mounting plate fixed to the casing. 1. An electric hot-air fan, wherein the mounting plate has a bearing located between the electric motor and the fan and supports a shaft of the rotor, and has an air discharge opening. (2) The electric warm air fan according to claim 1, wherein a regular iron plate is used as the core material of the stator (and/or rotor).