JPS63315860A - Electric fan heater - Google Patents

Abstract

PURPOSE:To make a compact hot air generating device by a method wherein a ceramic insulated electrical wire is utilized as the heating source. CONSTITUTION:Ceramic insulated electrical wire is utilized in coils 3 and 3' wound in a stator 1 and a rotor 2 of a heat generating generator. As a core member around which a winding is wound, a normal iron plate is used for improving heat generating characteristics. The core member around the windings of the stator 1 or the rotor 2 is provided with a clearance for improving an air flow. When the winding is connected with an external power supply, the rotor 2 is rotated, and a fan 4 is rotated; at the same time, the stator 1 and the rotor 2 may generate heat. Air sucked through an air intake port 8 passes through an air discharging port 11 of a fixing plate 10, flows into a clearance of the stator 1 or the rotor 2 to cool the stator 1 or the rotor 2. The air itself is heated and then flowed out as hot air through a hot air discharging port 12 of a casing 7.

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.

B. Conventional technology In conventional hot air generators, the blowing means and heat generating part are separate, as seen for example in hair dryers. 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 structure 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 enameled 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
The conductor material, which can be used in the temperature range of °C, includes aluminum constantum, 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 = 600°C, so that the insulator is completely made of ceramic, and the conductor material is nickel, stainless steel, nichrome, gold, platinum, or platinum rhodium. If so, it can be used for long periods at high temperatures of 600 to 800°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.9 Problems to be Solved by the Invention However, conventional hot air generators are equipped with a heat source such as an electric heater separate from the blower, which increases the number of parts and increases the cost. 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, causing the electric foundation to break.

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 effectively utilize these characteristics to generate warm air.

A further object of the present invention is to sufficiently cool the heat source that also serves as the power generating means, and to enable the temperature and air volume of the hot air to be switched in multiple stages.

21. Means for Solving 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
a casing that covers the electric motor and the fan and is provided with an air intake port and a hot air outlet; A gap is provided around the winding to improve air flow, and the winding is wound on both sides with a heat sink as a boundary.

E. Example Next, an example of the present invention will be described based on FIGS. 1 and 2.

The electric motor used in the electric hot-air fan of the present invention is a heat-generating motor that mainly uses heat generated by electric power rather than rotational torque. The above-mentioned ceramic insulated wire is used.

The core material of the stator l and rotor 2 around which the windings are wound is:
Normal electric motors use silicon steel plates to minimize heat loss due to hysteresis loss and eddy current loss, but the motor of the present invention uses ordinary iron plates as the core material to increase heat generation. The heat-generating motor of the present invention uses ceramic insulated wire that is thicker than normal motor windings and is wound less than the normal number of turns, and focuses on the heat generated by the motor rather than the rotational force of the motor. Suitable for wind generation.

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.

FIG. 2 shows a side view of a heat generating motor used in the present invention.
In order to efficiently cool the rotor, gaps or passages are provided in the core material around the windings of the stator l and rotor 2 to improve air flow.

Furthermore, the stator! Alternatively, the rotor 2 is provided with a heat sink plate 3 to improve the cooling effect, and the windings are wound on both sides with the heat sink plate 13 as a boundary.

The windings wound on both sides of the heat sink 13 change the number of turns, the thickness of the winding, or the type of winding with the heat sink I3 as a boundary, and these windings can be switched by a changeover switch (
(not shown in the figure) so that they can be connected to a power source either individually or in combination.

Note that although this example shows a type of electric motor (for example, a commutator motor) that has windings on the stator and rotor,
It is not necessarily necessary to be particular about this type of motor, and a type of motor that does not have windings on the rotor side, such as a cage induction motor, may be used.

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 intakes 8 are provided radially around the motor 6', and a hot air outlet 12 is provided behind the electric motor.

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

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

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 1 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 11 of the mounting plate 1o as shown by the arrow in FIG. The air flows into the gap between the stator 1 and the rotor 2, cools the stator 1 and the rotor 2, and the air itself is heated to become hot air and flow 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.

1. Effects of the Invention The present invention utilizes ceramic insulated wires as a heat source that also serves as a power generating means, so that the conventional heat generating means and air blowing means, which were separate, can now be reduced to 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.

In addition, in the present invention, the stator and rotor have gaps and heat sinks that improve air flow, so they can be efficiently cooled, and the number of turns or windings of the windings wound on both sides of the heat sink can be reduced. By changing the thickness of the wire or the type of winding and connecting each wire individually or in combination to a power source using a changeover switch, the temperature and volume of hot air can be changed in multiple stages.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional front view showing one embodiment of the present invention, FIG. 2 is a side view of a heating motor used in the present invention, and FIGS.
The figure is a diagram showing the structure of a ceramic insulated wire. l...Stator, 2...Rotor, 3...Rotor winding,
3... Stator winding, 4... Fan, 4'... Back plate, 5... Rotor shaft, 6.6'... Bearing, 7... Casing, 8... Air intake port, 9, IO...Mounting plate, 11...Air discharge opening, 12...Hot air discharge port, 1
3... Heat dissipation plate, patent applicant Noriyoshi Oi Figure 1 Figure 2

Claims (3)

[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, and a casing that covers the electric motor and the fan and is equipped with an air intake port and a hot air discharge port, and is designed to improve air flow around the windings of the stator (and/or rotor). In this electric hot air fan, a gap is provided, and the windings are wound on both sides with a heat sink as a boundary. (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). (3) The windings wound on both sides of the heat sink may be changed in number, thickness, or type of winding with the heat sink as a boundary, and may be individually or connected by a changeover switch. The electric warm air fan according to claim 1 or 2, which can be connected to a power source.