JPH04136460U - electric hot air machine - Google Patents

Abstract

(57) [Summary] [Purpose] To eliminate the need to use a temperature fuse by lowering the set temperature of the overheat prevention device of an electric hot air fan. [Structure] A fan cover 2 surrounding a blower fan 1 is attached to a base 3 to form an air passage A, and a ceramic heater 5 sandwiched between heater holders 7 and 7a is attached to an air outlet 4 provided in the base 3. . The heater holders 7 and 7a that hold the ceramic heater 5 also hold an excessive temperature rise prevention device 6 in close proximity to the heater. When the heater holders 7 and 7a are integrally attached to the air outlet 4 of the base 3, the heater holder 7
- By arranging the mounting portion of the overtemperature rise prevention device 6 of 7a to directly face the air path A, the overtemperature rise prevention device 6 can be cooled by the wind from the ventilation fan 1, and the set temperature can be lowered. Further, if a ventilation opening 8 is provided in the mounting portion of the overtemperature rise prevention device 6 of the heater holders 7 and 7a facing the air path A, air will flow directly to the overtemperature rise prevention device 6, improving the cooling effect.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This idea was developed for electric hot air machines that use heaters such as positive temperature coefficient thermistors as heating elements. It is related to

0002

[Conventional technology]

A conductor with a heat sink is placed between both sides of a positive temperature coefficient thermistor made of ceramic. Recently, electric hot air heaters have been developed, in which electrodes are attached to the heat dissipation plate to form a heating element. It has become popular as a popular product. This kind of electric hot air fan has positive characteristics. - Due to the characteristics of the mister, when it overheats, the resistance becomes high and the amount of current flowing decreases, making it highly safe. However, in order to further increase safety, an overtemperature rise prevention device (automatic reset type thermostat) has been installed. The structure is generally equipped with a stud (stat or non-returnable type thermal fuse), and a double Equipped with safety devices.

0003

[Problem that the idea aims to solve]

Do not block the hot air outlet of the electric hot air fan with a futon, towel, etc., or fall over with the hot air outlet facing down. This will cause the internal temperature of the hot air fan to rise, creating a risk of fire. Constructed with positive temperature coefficient thermistor. A heater that has been constructed is highly safe if the airflow completely stops, but if there is even a small amount of airflow, Because of this, the device continues to generate heat, so there is an overtemperature prevention device that detects the temperature rise and turns off the device. Equipped with a stop device.

0004 However, if the temperature detected by the overheat prevention device installed near the heater is set too low, Because there are many malfunctions, it cannot be lowered too low, and when the abnormal temperature of the frame is detected, the temperature is lowered to around 120℃. To prepare for abnormal situations, install a thermal fuse that cuts off the power. It is being said. For this reason, the overheat prevention device works in duplicate, increasing safety; Since it is a heavy safety device, it has the disadvantage of being expensive, and it is necessary to use a heater to prevent malfunction. If you increase the sensing temperature of the overtemperature protection device near the The problem is that the thermal fuse cannot be reused unless it is replaced. be.

[0005]

[Means to solve the problem]

The present invention is based on a fan cover 2 that surrounds a blower fan 1 and forms an air path A. 3 and a heater 5 attached to the air outlet 4 provided on the base 3. In the machine, the heater 5 and the overtemperature rise prevention device 6 provided close to the heater 5 are connected to the heater 5. the heater holders 7 and 7a, and integrally attach the heater holders 7 and 7a to the base 3. At the same time, the mounting part of the overtemperature rise prevention device 6 of the heater holder 7/7a is directly facing the air path A. This is an electric hot air fan.

[0006] In addition, the mounting portion facing the air path A of the overtemperature rise prevention device 6 of the heater holder 7/7a A ventilation opening 8 is provided to allow a small amount of air to flow through the temperature overrise prevention device 6 as well. It is something that

[0007]

[Effect]

Next, to explain the operation of the electric hot air fan according to the present invention, the blower fan 1 is When the heater 5 rotates and the heater 5 is energized, the blower fan 1 is connected to the fan cover 2 and the base 3. An air flow is created in the configured air path A, and the air flow passes through the air outlet 4 and is heated by the heater. 5, the air absorbs the heat from the heater 5, turns it into warm air, and sends it out of the machine.

[0008] The overtemperature rise prevention device 6 is fixed together with the heater 5 by being sandwiched between the heater holders 7 and 7a. The mounting part of the overtemperature rise prevention device 6 of the heater holders 7 and 7a does not have a base 3. Since it directly faces the air path A, the heater holder 7 is heated by the air flow flowing through the air path A. 7a is cooled, and the temperature overrise prevention device 6 can be set to a low temperature. stop If the hot air outlet is blocked, there will be almost no air flow and the heater holder 7 and 7a are no longer cooled, and the overtemperature protection device immediately detects the predetermined temperature. , the power supply to the heater 5 is stopped.

[0009] In addition, ventilation openings 8 are provided at the mounting portions of the overtemperature rise prevention devices 6 of the heater holders 7 and 7a. Then, normally, a part of the airflow flowing through the air path A passes through the ventilation opening 8 and passes through the temperature rise prevention device. Since the temperature is also supplied to the temperature rise prevention device 6, the temperature can be set to an even lower temperature. This allows for quick safety operation in the event of an emergency.

0010

【Example】

The configuration will be explained below with reference to figures showing examples. Figure 1 shows the overall configuration of the invented product. This is a cross-sectional view, and Figure 2 is a rear view of the main parts of the assembled parts, with common parts having the same reference numbers. This will be explained in the issue.

[0011] 1 is a blower fan, connected to the motor 1a attached to the base 3, and connected to the motor 1a. When energized, the blower fan 1 rotates. 2 is a fan that surrounds the outside of the blower fan 1 The fan cover 2 is integrated with the base 3 to which the motor 1a is attached, and A path A is formed.

0012 5 is a heater made of a positive temperature coefficient thermistor, and 6 is a temperature set close to the heater 5. This is an over-rise prevention device that uses heater holders 7 and 7a that clamp and hold the outer periphery of the heater 5. An excessive temperature rise prevention device 6 is also held in place. 4 is opened at a suitable place in the base 3 to form air passage A. The heater holders 7 and 7a are the air outlet that communicates with the air outlet 4 and the heater 5. It is attached to the base 3 so that the

[0013] 8 is a ventilation opening made in the mounting part of the overtemperature rise prevention device 6 of the heater holder 7/7a. The air outlet 4 of the base 3 is connected to the mounting part of the overtemperature rise prevention device 6 of the heater holder 7, 7a. Make the ventilation outlet 4 large so that it directly faces the air passage A, or make it face the mounting part. A small hole is drilled so that the air in the air passage A cools the mounting part of the overtemperature rise prevention device 6, and Air is blown from the air opening 8 to the overtemperature rise prevention device 6 for cooling.

[0014] The temperature overrise prevention device 6 of the embodiment senses an abnormal temperature (around 100°C) near the heater 5. When the temperature is detected, the hot air fan will stop operating, and automatically restart when the temperature drops. It is the shape.

[0015] 9 is a hot air outlet that discharges the hot air that has passed through the ceramic heater 5 to the outside of the electric hot air fan. The opening is provided on the front of the frame 10 of the electric hot air fan. 11 and 11a sandwich the heater 5. Screws 12 are for fixing the heater holders 7 and 7a to the base 3 while attaching them. This is the operation switch for the hot air fan.

[0016]

[Effect of the idea]

The present invention having the above configuration and operation is a device for preventing excessive temperature rise of the heater holders 7 and 7a. Since the mounting part of the fan 6 is directly facing the air passage A, the air is not blown by the fan 1 during normal operation. The heater holders 7 and 7a are constantly cooled with air, and an excessive temperature rise prevention device is installed. The ambient temperature of 6 becomes low, and even if the set temperature is lowered, the overtemperature rise prevention device 6 malfunctions. The fear of doing so is gone.

[0017] If the hot air outlet is blocked, there will be almost no air flow, and the heater holder 7. a will no longer be cooled, and the ambient temperature near the overtemperature rise prevention device 6 will immediately rise abnormally. The device detects a predetermined temperature and stops energizing the heater 5, and the width of the temperature rise is It has become larger and more reliable.

[0018] In addition, in the conventional product, the temperature overrise prevention device 6 installed near the heater 5 controls the set temperature. If it wasn't set high, there were many malfunctions. On the other hand, if the set temperature is increased in this way, the electric temperature Since the internal temperature of the fan tends to become high, a thermal fuse should be installed in case of an operational error. However, the thermal fuse may blow out first, causing problems in handling. It was. However, if the overtemperature rise prevention device 6 is installed as in the present invention, the temperature fuse will be prevented. There is no need to replace the thermal fuse, and the structure is simple and cost-effective. This is something that leads to un.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing the overall configuration of the product of the present invention.

FIG. 2 is a rear view of the main parts of the assembled parts of the product of the present invention.

[Explanation of symbols]

1 Blow fan 2 Fan cover 3 base 4 Air outlet 5 Heater 6 Overtemperature rise prevention device 7 Heater holder 7a Heater holder 8 Ventilation opening A Wind path

Claims (2)

[Scope of utility model registration request] 1. An electric hot air machine in which a fan cover 2 that surrounds a blower fan 1 and forms an air passage A is attached to a base 3, and a heater 5 is attached to an air outlet 4 provided on the base 3. A temperature rise prevention device 6 provided close to the heater 5 is sandwiched between the heater holders 7 and 7a, and the heater holders 7 and 7a are integrally attached to the base 3, and the temperature rise prevention device 6 is attached to the heater holders 7 and 7a. An electric hot air fan with the part directly facing the air path A. [Claim 2] Heater holders 7 and 7a facing the air path A
2. The electric hot air fan according to claim 1, wherein a ventilation opening 8 is provided in the mounting portion of the overtemperature rise prevention device 6.