JPH086197Y2 - Electric warm air blower - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] The present invention relates to an electric air blower having a fan that rotates inside the body and a heater that heats the fan to make it warm. .

[Conventional technology]

As a conventional electric warm air blower, for example, as shown in Japanese Utility Model Laid-Open No. 58-123250, a general electric warm air blower has a structure as shown in FIG.

That is, a suction port 7 was opened at the bottom of the box-shaped body case 1, and a propeller-type flat plate-shaped motor fan 2 with a single blade was installed near the suction port 7.

An air guide 4 for forming a warm air passage 12 and a cool air passage 10 provided with a heater 3 is provided above the motor fan 2, and a connection hole 8 is provided above the air guide 4, and the connection hole is formed. An overheat protector 5 electrically connected to the heater 3 is provided directly above the heater 8, and a blowout louver 6 is provided in the body case 1 on the outlet side of the hot air passage 12 and the cool air passage 10. It was a composition.

Further, in the publicly known example No. Sho 60-7560, a wind tunnel installed in the main body having an air outlet on the front side and communicating with the air outlet, and a heating element installed in the air tunnel, A fan unit for passing hot air through the heating body and discharging hot air from the outlet is provided, and the fan unit is equipped with axial fans on both shafts of the motor, and is provided on the leeward side of the heating body on the outside of the wind tunnel. , There is a description of a warm air machine in which a space communicating with the inside of the wind tunnel is formed in a portion located in the central portion between the left and right axial flow fans, and an overheat prevention device is provided in this space, which is already known. There is.

In addition, in the publicly known example No. Sho 62-38551, a fan provided in the main body, a heater provided in an air blowing path of the fan, and an energization of only the heater due to an abnormally high temperature provided in an energizing path of the heater are disclosed. There is a description of a hot air blower provided with a thermal switch for shutting off the air and an abnormality indicator which operates according to the shutting off operation of the thermal switch, and it is already known.

Incidentally, in the known example JP-A-62-49157, a blower,
There is a description of an electric fan heater provided with a heater and a fall detection switch, and when the fall is detected, the fall detection switch is opened to stop the energization of the heater, and then a time timer for energizing the blower for a certain period of time is provided, which is generally known. There is.

[Problems to be solved by the device]

According to the configuration described in Japanese Utility Model Laid-Open No. 58-123250, when the blowout louver 6 provided in the body case 1 is blocked for some reason, the warm air heated by the heater 3 is used. Since the air is not blown out of the body case 1, the inside of the hot air passage 12 is abnormally heated.

In this case, the temperature inside the hot air passage 12 gradually becomes higher with the passage of time, and a part of the hot air that has reached the high temperature passes through the connection hole 8 so that the overheat preventive device 5 is provided. It operates and shuts off the heater 3 of the heating source, but since the overheat protector 5 is attached to the air passage of the cool air passage 10, the temperature detection accuracy is poor, and it requires long heating to operate. In a remarkable case, there was a problem such as deformation of the container case 1 made of synthetic resin.

Further, in an abnormal state in which the motor fan 2 becomes unrotatable for some reason, the heater 3 heated in the hot air passage 12 is, as in the state in which the blowout louver 6 is blocked, as time passes. The temperature gradually increases, and a part of the high-temperature hot air passes through the connecting hole 8, the overheat preventive device 5 operates, and the heater 3 as a heating source is shut off.

In this case, there is a problem that the temperature detection accuracy of the overheat prevention device 5 is significantly deteriorated.

Further, according to the configuration described in Japanese Utility Model Laid-Open No. 60-7560, since it is a fan unit in which both shafts of the motor are equipped with an axial flow propeller fan, an axial fan is installed at both ends around the motor. Inevitably, it will be necessary for the horizontally wide structure, and a thickness greater than the rotation width depending on the diameter of the propeller fan is required.

Moreover, there was unevenness in the air volume between the fan horizontals on both sides.

Since the air volume on both sides is small and the air volume in the central part is large, the air volume passing through the heater is also large in the central part, and there is a problem when the hot air supplied to the front surface of the hot air outlet is uneven. It was

During normal operation, the overheat prevention device at the highest wind speed is always cooled, so it takes a long time to reach the set temperature in the event of an abnormality.

In addition, when the outlet is blocked with cloth or the like, the heater and the motor stop at the same time, but the heated body is not forcibly cooled before the overheat prevention device operates, so burned until it cools.・ There was a risk of fire.

Further, according to the configuration described in Japanese Utility Model Laid-Open No. 62-38551, when the temperature inside the body is abnormally high, the thermal switch is activated and only the heater is stopped, but the fan continues to be activated and then stopped. However, even after the aircraft has been sufficiently cooled, it will continue to rotate unless the manual switch is closed, thus requiring wasteful electricity.

[Means for solving the problem]

The present invention has been made to solve the above-mentioned problems, and has a vertical container case having a blow-out air passage in the lower front part and an intake port in the rear part, and is installed in this container case. A cover having an opening for installing an air guide passage provided so as to communicate with the blowout air passage in a direction substantially perpendicular to the suction port, a fan motor in the communication portion, and a desk plate rotated by the fan motor. It consists of a partition plate with a blower that attaches small blades and large blades facing each other on both sides, and a heater mounting part with a built-in heater is provided in the air guide passage, and the partition is placed above the heater mounting part. An overtemperature protector was provided in the space communicating with the plate, which shuts off the power to the heater during abnormal heating with the blowout air passage blocked.

In addition, the blower is provided with a delay switch for continuing the operation of the blower after the operation of the overheat protector.

[Action]

Due to the above-mentioned configuration, in normal operation, large blades installed on opposite sides of the desk plate of the blower device facing each other.
The small blades rotate and suck in cool air from the suction port that is opened on the back of the body case, and the cool air is energized by the heater built into the heater installation part provided in the discharge side air guide of the blower, and the heater To become warm air, and the hot air is discharged to the lower part of the front surface of the body case from the blowing louver provided in the blowing air passage.

Also, in an abnormal condition such as the blowout louver at the lower front of the body case is blocked, the temperature of the heater / heater mounting part etc. becomes high, and the temperature becomes higher due to the conduction heat of the heater mounting part and some hot air from the connecting hole. After the overheat protector is heated and reaches or exceeds the operating set temperature, the electrically connected heater is de-energized.

The operation of the blower does not stop at the same time when the heater is de-energized, and continues until the portion abnormally heated by the delay switch cools to a safe state.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

 The configuration of the embodiment is as shown in FIGS.

In the figure, reference numeral 1 denotes a vertical body case, which is formed in a box shape, for example, made of metal, heat-resistant synthetic resin, or the like, and a suction port 7 is opened in the back surface of the body case 1.

2 is an air blower, which is composed of a fan motor 9, a shaft center portion 11, a desk plate 13, and large blades 14 and small blades 15 which are attached to both sides of the desk plate 13 so as to face each other. Delay switch 26 that keeps energizing until the safe condition such as 1
Is provided.

The fan motor 9 has a shaft center portion 11, and the shaft center portion 11
A plate-shaped desk plate 13 is integrally fixed to the end of the desk plate 13, and a large blade 14 is formed at the end of the desk plate 13 in a direction substantially perpendicular to the plate surface of the desk plate 13. Small blades 15 are further formed on the desk plate 13 on the opposite side of the.

Reference numeral 16 denotes a partition plate, which is provided inside the body case 1 and is installed so as to be divided into a motor installation room 18 and a fan installation room 19.

Reference numeral 17 denotes a communication portion, which is opened in the central portion of the partition plate 16 so as to connect the motor installation chamber 18 and the fan installation chamber 19 to each other.

An axial center portion 11 of the fan motor 9 is provided through the communicating portion 17 formed in the partition plate 16, the fan motor 9 is attached with the partition plate 16 as a boundary, and a large blade 14 is provided on the opposite side of the fan motor 9. A desk plate 13 having small blades 15 formed on both sides so as to face each other is provided so as to be freely rotatable.

A cover 23 is attached to the partition plate 16 so as to cover the desk plate 13, the large blades 14, the small blades 15 and the like, and an opening 24 is provided in the center of the cover 23, and the opening 24 is the body case. It is installed so as to face the suction port 7 of No. 1.

Reference numeral 20 denotes an air guide passage, which is formed by the partition plate 16 and the cover 23. In this case, the air guide passage 20 is provided in the lower portion of the body case 1 and communicates with the air guide passage 20 to attach the heater. There are 25.

Inside the heater mounting portion 25, for example, a planar honeycomb type heater 3 is provided, and the temperature rises in the space communicating with the communication portion 17 provided in the partition plate 16 at the upper portion of the outer surface of the heater mounting portion 25. The preventive device 5 is attached, and a connecting hole 8 is opened in the heater attaching portion 25 near the attachment of the overheat preventive device 5 so as to communicate with the motor installation chamber 18.

A blowout air passage 21 is provided so as to communicate with the heater mounting portion 25, one end of which is opened at the lower front surface of the body case 1, and a blowout louver 6 is provided in the blowout air passage 21 so as to be movable. There is.

Reference numeral 22 denotes an operation unit, which is a power switch or a capacity switching switch including dials and push buttons, and is electrically connected to the blower device 2, the heater 3, the overheat preventive device 5 and the like to perform a driving operation. It is a thing.

 Next, the operation of the above configuration will be described.

In normal operation, when the operation unit 22 is operated, the heater 3, the air blower 2 and the overheat protector 5 are energized to heat the heater 3, and the fan motor 9 of the air blower 2 causes the small blades to move. 15 and large blades 14 are opposed to each other, and desk plates 13 attached to both sides rotate to suck in cool air from the suction port 7 of the body case 1, and the cool air is introduced into the opening 24 of the cover 23 and blower 2 Most of the cool air is guided by the large blades 14 to the air guide passage 20 installed in the lower part as shown by the arrow A, and becomes warm air by passing through the heater 3 attached to the heater attachment portion 25, and the blowout air passage 21 Hot air is discharged to the front of the body case 1 by the blow-out louver 6 inside.

On the other hand, by rotating the small blades 15 formed on the partition plate 16 side of the blower device 2, the communication from the communicating portion 17 of the partition plate 16 to the body case 1 is performed.
Cooling air that has cooled the fan motor 9 whose temperature has risen due to the cold air that has passed through the suction port 7 and the connecting hole 8 of the heater mounting portion 25
A part of the warm air is guided to the air guide passage 20 by attracting a small amount of warm air that has passed as indicated by the arrow B.

In this case, the overheat protector 5 mounted on the upper surface of the heater mounting portion 25 is kept at the operating temperature or lower, so that the heater 3 and the blower device 2 continue to operate.

Further, when the blowout louver 6 in the blowout air passage 21 that opens to the lower front of the body case 1 is in an abnormal state in which the opening is blocked by, for example, a curtain or clothes, the heater is energized and continues to operate. 3 is as the energizing time passes,
The temperature inside the heater mounting portion 25 and the blowout air passage 21 rises to a high temperature, the heat becomes conduction heat of the heater mounting portion 25, and a part of the hot air that has risen in temperature flows as indicated by the arrow B. Since the overheat prevention device 5 is heated, after reaching the operation set temperature or higher, the energization of the heater 3 electrically connected to the overheat prevention device 5 is cut off.

In this case, the operation of the blower 2 is not stopped at the same time that the heater 3 is turned off, but the part that is abnormally heated by the delay switch 26, for example, the heater 3, the heater mounting portion 25, the blowout air passage 21, the blowout louver 6, and the body case. Continue operation until 1st cools down to a safe state.

[Effect of device]

According to the present invention, according to the present invention, when the blowout louver in the blowout air passage provided at the lower part of the front surface of the body case is blocked for some reason, a connecting hole and an overheat preventive member are provided in the upper part of the heater mounting portion having the heater. Due to the combined effect of the conduction heat and the warm air heat, the temperature detection accuracy of the overheat prevention device is improved and the device operates in a short time. The problem of deformation of the case was solved.

Also, the heater is shut off after the overheat protector operates, but since the blower has a delay switch,
Cooling is continued until the heated part is cooled down to a safe state, so it has the advantages that it can protect the case and other parts from the adverse effects of high heat and that there is no risk of burns or fire. .

Even in an abnormal state where the motor fan cannot rotate, the temperature detection accuracy of the overheat protector becomes significantly good due to the synergistic effect of conduction heat and high-temperature hot air.

In addition, for fan units that install small blades and large blades on opposite sides of a desk plate that rotates with a fan motor, facing each other, the thickness width of the blade unit of the fan unit can be reduced, and a partition that stores the rotating blade unit is provided. Since the thickness of the air duct formed by the plate and the cover can be made small, the overall thickness can be reduced.

In addition, since the air supplied by the small blades and the large blades of the air blower is converged and guided in one direction to the air guide passage, warm air can be smoothly and efficiently supplied when the heater is energized, and the air guide passage is also provided. After being converged by, the hot air is supplied to the front surface of the hot air blower, so that the hot air becomes uniform and a useful electric warmer can be provided.

[Brief description of drawings]

FIG. 1 is a sectional side view of an electric warmer showing an embodiment of the present invention. FIG. 2 is an electric circuit diagram of an electric hot air blower showing an embodiment of the present invention. FIG. 3 is a side cross-sectional view of an electric hot air blower showing a conventional example. [Explanation of symbols] 1 …… Body case 2 …… Blower 3 …… Heater 5 …… Overheat protector 7 …… Suction port 8 …… Connection hole 9 …… Fun motor 11 …… Shaft center 13 ...... Desk board 14 …… Large blade 15 …… Small blade 16 …… Partition plate 17 …… Communication part 20 …… Air flow path 21 …… Blowout air path 23 …… Cover 24 …… Opening 25 …… Heater mounting Department

Claims (2)

[Scope of utility model registration request] 1. A vertical container case (1) having a blowout air passage (21) in the lower front part and an intake port (7) in the rear part, and a device in the container case (1). And a cover (23) having an opening (24) for installing an air guide passage (20) provided so as to communicate with the blowout air passage (21) at a substantially right angle, facing the suction opening (7). An air blower for attaching the fan motor (9) and the small blade (15) and the large blade (14) to the communicating portion (17) so as to face each other on both sides of the desk plate (13) rotated by the fan motor (9). (2) is attached to the partition plate (16), and the air guide (20) is provided with a heater mounting part (25) containing the heater (3). Above the heater mounting part (25) , When the heater (3) is opened during abnormal heating when the blowout air passage (21) is blocked in the space communicating with the communication part (17) opened in the partition plate (16). Electric fan heater, characterized in that provided overheat protector (5) that block. 2. The blower device (2) is provided with a delay switch (26) for continuing the operation of the blower device (2) after the operation of the overheat protector (5). Item 1. The electric warm air blower according to item 1.