JPH0765812B2 - Hot air type electric kotatsu - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a warm-air type electric kotatsu using a ring-shaped heater as a heating element, and is particularly characterized by improving the temperature distribution in the kotatsu. Is.

2. Description of the Related Art In a conventional warm-air type electric kotatsu, a heating element unit 1 as shown in FIGS. 8 and 9 is arranged below a yagura 2. A quadrilateral reflection plate 3 is arranged above the heat generating unit 1. A quadrangular pyramid-shaped first projecting portion 5 which projects upward and has an inclined guide portion 4 on the side surface is formed in the central portion of the reflecting plate 3, and the tip surface portion 6 of the first projecting portion 5 is formed. A second protruding portion 7 protruding upward is formed in the central portion. A fan 8 is arranged below the second protruding portion 7, and the fan 8 is
A motor 9 that rotationally drives the fan 8 is disposed below the motor, and the motor 9 is fixed to a motor mounting portion 11 of a mounting tool 10 located below. A pair of bar-shaped heaters 12 that are opposed to each other below the first protruding portion 5 and on the side of the fan 8 are arranged, and below the bar-shaped heaters 12, heat shields 13 provided in the fixture 10 are arranged. It is set up. A plurality of elongated holes 14 are formed in the heat shield 13 so that the radiant heat of the rod-shaped heater 12 is appropriately radiated downward, and the fixture 10 is provided between the motor mount 11 and the heat shield 13. An intake hole 15 is formed at the position for sucking the air flow a generated by the fan 8. Reflector 3, fan 8, motor 9, rod-shaped heater 12, fixture 1
A protective cover 16 is arranged so as to cover the lower part of 0.

With the above configuration, when the fan 8 is rotationally driven by the motor 9, the air flow a sucked through the intake holes 15 is blown onto the rod-shaped heater 12 to be heated. The heated air flow a is blown out from the air outlet 17 formed between the outer edge of the fixture 10 and the inclined guide portion 4 of the first protrusion 5, and the space surrounded by the tower 2 is heated. It

However, in the configuration as shown above, since the pair of rod-shaped heaters 12 are arranged in parallel, the rod-shaped heater 12
The radiant heat of 12 is not radiated evenly into the space of the tower, and a temperature difference occurs between the air flow a in the direction in which the rod heater 12 is arranged and the air flow a in the direction in which the rod heater 12 is not arranged. Had the problem of doing.

In addition, because of the temperature difference, the temperature of the heating element unit 1 must be detected, and the arrangement of the detection element that controls the power supplied to the rod-shaped heater based on the detected output must be selected. There was difficulty.

The present invention is to solve such conventional problems, to radiate the radiant heat of the heater evenly, and to make the temperature of the air flow uniform, thereby making the temperature distribution in the yagura even for the warmer. It is intended to provide an easy-to-use warm air type electric kotatsu.

Means for Solving the Problems The warm-air type electric kotatsu of the present invention is an inverted frustoconical projection part provided so as to project downward at substantially the central part of a reflector provided in a tower, and the projection part Intake holes and discharge holes respectively formed in the tip surface portion and the side inclined portion, an inclined guide portion formed on the reflection plate so as to be inclined to the outer side and located on the side of the protrusion portion, and the protrusion portion substantially at the center. And a ring-shaped heater disposed below the reflection plate having a space so as to be positioned on the side of the protrusion and located in the space formed inside the protrusion. A motor fixed to the tip end surface portion of the protrusion, a fan located above the motor and driven to rotate by the motor, and arranged above the fan so as to shield the space of the protrusion. Located below the heater and the wind guide provided. And a heat shield part having a plurality of radiation holes arranged in the same manner.

Further, in order to control the temperature in the wag more accurately, a heat-sensitive air hole is formed in the inclined guide portion of the reflection plate, and the detection element that controls the electric power supplied to the heater by the detection output according to the detected temperature. Is preferably arranged on the reflection plate so as to be positioned in the air flow heated by the heater blown out from the heat-sensitive air holes.

Further, in order to control the temperature in the yagura with a quick response, an air flow flowing between the heater and the reflector is provided with a detection element for controlling the electric power supplied to the heater by the detection output according to the detected temperature. It is advisable to dispose on the reflector so as to be located in the upper layer flow and lateral to the heater.

Action Since the warm air type electric kotatsu of the present invention is configured as described above, the ring-shaped heater radiates radiant heat to its surroundings, and the radiant heat is reflected by the side inclined portion of the protruding portion, so that The radiant heat of the heater is evenly radiated to the entire inner space. Moreover, the radiant heat of the heater is evenly diffused by the air flow generated by the fan throughout the space in the tower, so that the temperature in the tower is further equalized. Further, since the fan and the motor that rotates the fan are located in the space formed inside the protrusion and are fixed to the protrusion, the fan and the motor are protected by the protrusion against foreign matter and external force. Since the radiant heat of the heater is shielded by the side inclined portion of the protruding portion, deterioration of quality of the motor due to heat is prevented.

Further, by detecting the temperature of the air flow blown out from the heat-sensitive air holes with the detection element, the temperature of the air flow heated by the ring-shaped heater, or the temperature of the air flow and the temperature of the air flow are heated by the heater. Since the temperature of the space above the reflector to which the heat of the reflector is transferred or the temperature of the reflector itself is added is detected, the temperature of the heating element unit including the heater and the reflector is accurate. Therefore, the temperature control for equalizing the temperature of the entire space in the yagura can be accurately performed.

Further, by detecting the temperature of the upper laminar flow of the air flow flowing between the heater and the reflecting plate with the detection element, the temperature of the upper laminar flow that responds quickly to the influence of the radiant heat of the heater can be detected. The temperature of the heating element unit composed of the reflection plate or the like can be detected with high responsiveness, and the temperature for equalizing the temperature of the entire space in the yagura can be accurately performed with high responsiveness.

Example A warm-air type electric kotatsu according to an example of the present invention will be described below.
This will be described with reference to FIGS.

1 to 3, the warm air type electric kotatsu according to the first embodiment of the present invention will be described.

In the figure, a top plate 32 is provided on the top surface of the yagura 31. Below the top plate 32, a heating element unit 33 is arranged such that at least a part of the top plate 32 abuts or a predetermined space is provided. The heat generating unit 33 has a quadrilateral reflection plate 34 at an upper position with a predetermined space provided in the top plate 32. The reflecting plate 34 is integrally formed with an inverted frustoconical projection 35 projecting downward at a substantially central portion thereof, and an outer edge portion on the side of the projection 35 is outwardly downward with the projection 35 as a substantially central portion. A slanted truncated cone side wall-shaped slant guide portion 36 is formed. A plurality of intake holes are formed in the tip surface portion 55 of the protruding portion 35.
37 is formed, and a plurality of blowout holes 39 are provided in the side inclined portion 38 of the protruding portion 35. The protrusion 35 is located substantially at the center, and is positioned with a predetermined space between the protrusion 35 and the tilt guide portion 36, and is also positioned below the reflector 34 with a predetermined space. A ring-shaped heater 40 is provided so as to do so. A disk-shaped heat shield 41 is provided below the heater 40 with a predetermined space and the protrusion 35 is located substantially in the center. The heat shield 41 is the tip surface 55 of the protrusion 35.
The heat shield 41 has a radiation hole 42 formed at a position below the heater 40, and a hole 43 formed at a position facing the intake hole 37 of the tip surface 55. An air outlet 45 is formed between the outer edge of the heat shield 41 and the outer edge of the reflection plate 34 so that an air flow b generated by a fan 44 described later is heated by the heater 40 and then blown out. The air outlet 45 may be formed in a cutout shape or a hole shape at the outer edge of the heat shield 41 by extending the outer edge of the heat shield 41 so as to abut against the outer edge of the reflection plate 34. That is, the blower outlet 45 is provided after the air flow b generated by the fan 44 described later is heated by the heater 40.
It may be formed so as to be blown out into the space of 31. A motor 47 is located in a space 46 formed inside the protrusion 35,
The motor 47 is attached to the tip surface portion 55 of the protrusion 35. The fan 44 rotated by the motor 47 is a motor 47.
A disc for shielding the space 46 at a position above the fan 44 so that an air flow b is generated at a position above the fan 44 at least so that the reflection plate 34 is not abnormally heated by the radiant heat of the heater 40. -Shaped wind guide portion 48 is located, and the wind guide portion 48 is formed with a protrusion 54 that is formed so as to protrude upward in a substantially central portion thereof.
Is attached to the reflecting plate 34 by abutting on the top plate 32 or by providing a predetermined space. A protective cover 49 is provided below the reflection plate 34 and the heat shield 41 with a predetermined space. In addition, a corner side of the reflector 34, that is, at a position where a warmer is unlikely to be located, and a heat-sensitive air hole 50 is formed in the inclined guide portion 36 of the reflector 34 so as to connect the reflector 34 and the heater 40. A part of the air flow b including the upper laminar flow flowing between them is blown out to the upper side of the reflection plate 34. A power plug receiver 51 is arranged on the upper surface of the reflector 34 located in a part of the air flow b, and the power plug receiver 51 has a removable power plug 52.
Are connected. The removable power plug 52 has a built-in detection element 53 for detecting the temperature of a part of the air flow b blown out from the heat-sensitive air hole 50. The detection element 53 detects the temperature and controls the electric power supplied to the heater 40 based on the detected output. The detection element 53 is located above the reflection plate 34 and at a position where the temperature of a part of the air flow b can be detected. or,
A position where a part of the air flow b can be detected and a position where the temperature of the reflection plate 34 can be detected, for example, a part of the detection element 53 is brought into contact with or close to the upper surface of the reflection plate 34. You may arrange | position in the position where it was made.

With the above configuration, when the fan 44 is rotationally driven by the motor 47, the air flow b is generated. The air flow b recirculates as follows. First, the cold air below the motor 47 in the yagura 31 is cooled by the space 46 of the protrusion 35 from the intake hole 37 through the hole 43.
After being sucked in, the air is blown from the blow-out hole 39 toward the ring-shaped heater 40. The cold air becomes warm air due to the radiant heat of the heater 40 and flows along the inclined guide portion 36 of the reflection plate 34. Then, the warm air is blown into the yagura 31 from the air outlet 45, and the temperature of the space inside the yagura 31 is equalized while promoting the movement of the air inside the yagura 31, so that the entire space inside the yagura 31 is warmed. To be Then, the warm air cooled in the space inside the yagura 31 is again sucked as the cold air from the intake hole 37. In addition, the radiant heat of the heater 40 is generated by the side inclined portion 38 of the inverted truncated cone-shaped protruding portion 35.
Reflected by the inner space, the space inside Yagura 31 is warmed up.
Further, the temperature of a part of the air flow b blown out from the heat-sensitive air holes 50 formed in the side inclined portion 38, or the air flow b
The temperature of a part of the above and the temperature of the space above the reflection plate 34 or the temperature of the reflection plate 34 is detected as the temperature of the heating element unit 33 by the detection element 53 built in the detachable plug 52, The electric power supplied to the heater 40 is controlled by the detection output.

As described above, according to the present embodiment, the protrusion 35 is integrally formed in the shape of an inverted truncated cone, and the ring-shaped heater 40 is disposed so that the protrusion 35 is located substantially in the center. Therefore, the heater 40 radiates radiant heat to its surroundings, and the radiant heat of the heater 40 is reflected by the side inclined portion 38 of the protrusion 35,
The space of Yagura 31 is warmed up evenly.

Further, the fan 44 is disposed in the space 46 of the projecting portion 35, and the space 46 for rotation of the fan 44 is shielded by the wind guide portion 48, so that the air flow b is evenly directed to the periphery, that is, toward the heater 40. As a result, the movement of the air flow b heated by the radiant heat of the heater 40 is promoted over the entire space inside the tower 31, and the temperature inside the tower 31 is further equalized. Further, since the radiant heat of the heater 40 is shielded by the side inclined portion 38 of the protrusion 35, the deterioration of the quality of the motor 47 is prevented, and thus it is necessary to separately provide a heat shield instead of the side inclined portion 38 as in the conventional case. Disappear.

Further, since the fan 44 and the motor 47 are arranged in the space of the projecting portion 35, the projecting portion 35 protects against foreign matter such as a stick or external force.

In addition, the temperature of the air flow b heated by the heater 40 through the heat-sensitive air holes 50 formed in the side sloped portion 38, or the temperature of the air flow b and the heat of the reflection plate 34 are transferred. Reflector 34
The temperature of the space above or the temperature of the reflection plate 34 itself can be detected by the detection element 53 arranged above the reflection plate 34, so that the temperature of the heating element unit 33 can be accurately detected, Accurate temperature control is performed to equalize the temperature of the entire space inside 31.

Further, since the heat shield portion 41 that shields the radiant heat of the heater 40 and prevents the heater 40 from being damaged by an external force is attached to the projecting portion 35, the position of the heat shield portion 41 due to the external force does not change and the initial purpose is kept. Can be achieved.

Further, since the protrusion 35 is formed integrally with the reflection plate 34, the strength of the reflection plate 34 alone can be obtained.

Next, a second embodiment of the warm air type electric kotatsu according to the present invention will be described with reference to FIG.

The difference between the present embodiment and the first embodiment will be described. The reflector 60 is formed by integrally forming the reflector 34 and the wind guide portion 48 shown in FIGS. The heating unit is formed by forming the projection 35 integrally formed on the plate 34 as a separate projection 61 and attaching the projection 61 to the reflection plate 60.
33 is composed.

With the above structure, in this embodiment, the same effect as that of the first embodiment can be obtained, and since the protrusion 61 is processed as a separate body, the above-mentioned processing is facilitated.

Next, a third embodiment of the warm air type electric kotatsu according to the present invention will be described with reference to FIGS.

Explaining the difference between this embodiment and the first embodiment, the wind guide portion 63 is a reflection in which the edge portion of the wind guide portion 48 shown in FIGS. 1 to 3 is extended to a position above the heater 40. It is attached to the upper surface of the plate 34, and the reflector 64 of this embodiment is shown in FIG.
The inclined guide portion 36 having a truncated cone side wall shape of the reflection plate 34 shown in FIG. 3 is formed as an inclined guide portion 65 formed in a quadrangular pyramid side wall shape. Further, the heat-sensitive air hole 50 shown in FIGS. 2 and 3 is not formed in the inclined guide portion 65 of this embodiment, and the detachable power source plug 52 having the power source plug receiver 51 and the detecting element 53 built therein. The position of the detection element 53 is detected from the position above the reflection plate 64 to the temperature of the upper laminar flow of the air flow b flowing between the reflection plate 64 and the heater 40 below the reflection plate 64. Below the outer edge of the reflection plate 64 including the inclined guide portion 65 of the reflection plate 64 that can be detected by the element 53, that is,
It is replaced with a position below the reflection plate on the side of the heater 40. Further, the tip portion 55 of the protrusion 35 formed on the reflector 64
Between the protective cover 49 and the protective cover 49, a mesh plate-shaped heat shield portion 66 made of a wire mesh or the like is provided in place of the heat shield portion 41 shown in FIGS. .

As described above, according to this embodiment, the upper layer of the air flow b, which is affected by the radiant heat of the heater 40 by flowing between the reflection plate 64 and the heater 40 and has a quick response to the temperature change of the heater 40. Since the flow is detected by the detection element 53, temperature control for equalizing the temperature of the entire space in the yagura 31 can be accurately performed with high responsiveness. Further, the heat of the reflection plate 64 heated by the heater 40 is also prevented from being transferred upward by the wind guide portion 63 attached to the upper surface of the reflection plate 64, and the air flow b is evenly distributed to the heater 40. Can be led to be blown out.

EFFECTS OF THE INVENTION Since the present invention is configured as described above, the effects described below occur.

The warm air electric kotatsu according to claim 1, wherein an inverted frustoconical projection having an intake hole and a blowout hole is disposed substantially in the center of the reflector, and the projection is positioned substantially in the center. A ring-shaped heater is arranged on the side of the protruding portion, a fan and a motor for rotating the fan are arranged in a space formed inside the protruding portion, and the fan is positioned above the fan. And since the wind guide part that shields the space is arranged,
The temperature inside the tower can be equalized by the combination of the radiation heat of the heater with respect to the space inside the tower, or the combination of the reflection of radiation heat by the side slope of the protrusion and the transfer of the heater radiation by the air flow generated by the fan. Further, since the radiant heat is shielded by the side inclined portion, deterioration of the quality of the motor can be prevented. In the warm air type kotatsu according to claim 2, the projection is integrally formed with the reflection plate, and thus the reflection plate is formed. The strength of a single product can be obtained.

In the warm air type kotatsu according to the third aspect, since the protrusion is formed separately from the reflector, the protrusion can be easily processed.

In the hot-air type kotatsu according to claim 4, the edge of the wind guide portion that shields the space of the protruding portion is extended so as to be located at least above the heater, so that the heat of the reflection plate heated by the heater is It is possible to prevent heat from being transferred above the reflector.

In the warm air type kotatsu according to claim 5, a heat-sensitive air hole is provided in the inclined guide portion of the reflection plate, and the heat-sensitive air hole is located in the air flow heated by the heater blown by the fan from the heat-sensitive air hole. By disposing the detection element at a position above the reflection plate, the temperature of the airflow heated by the heater can be easily detected, and the temperature inside the yagura can be accurately controlled.

In the warm air type kotatsu according to claim 6, by arranging the detection element so as to be located below the reflection plate and beside the heater that can detect the temperature of the upper laminar flow of the air flow,
It is possible to accurately and quickly control the temperature inside the tower.

[Brief description of drawings]

FIG. 1 is a sectional side view showing a main part of a warm air type kotatsu according to the first embodiment of the present invention, FIG. 2 is a partially cutaway plan view showing a main part of the warm air type kotatsu, and FIG. Sectional drawing which shows the principal part of the same temperature type kotatsu, FIG. 4 is a sectional side view which shows the principal part of the warm air type kotatsu of the 2nd Example in this invention, FIG. 5 is 3rd Example in this invention. A cross-sectional side view showing the main parts of the warm air type kotatsu,
FIG. 6 is a partially cutaway plan view showing the main part of the warm air type kotatsu,
FIG. 7 is a cross-sectional side view showing the main parts of the same warm-air kotatsu, FIG. 8 is a partially cutaway plan view showing the main parts of a conventional warm-air kotatsu, and FIG. It is sectional drawing which shows a part. 31 …… Yagara, 33 …… Heating unit, 34,60,64 …… Reflector, 35,61 …… Projection part, 36,65 …… Inclined guide part, 37…
… Intake hole, 38 …… side inclined part, 39 …… blowing hole, 40 …… heater, 41 …… heat shield part, 42 …… radiating hole, 44 …… fan, 45…
… Blowout port, 46 …… space, 47 …… motor, 48,63 …… wind guide part, 55 …… tip surface part.

Claims (6)

[Claims] 1. A reflector provided on a tower, an inverted frustoconical projection provided so as to project downward at a substantially central portion of the reflector, and an intake air formed on a tip end surface of the projection. A hole,
A blowout hole formed in the side inclined portion of the protruding portion, an inclined guide portion formed on the reflection plate so as to be positioned on the side of the protruding portion and inclined downward downward, and the protruding portion in a substantially central portion. A ring-shaped heater disposed with a space with respect to the reflection plate so as to be positioned on the side of the protrusion, and the heater positioned so as to be positioned in the space formed inside the protrusion. A motor attached to the tip surface of the protrusion, a fan located above the motor and driven to rotate by the motor, and arranged above the fan so as to shield the space of the protrusion. Warm air type electric kotatsu, which includes a wind guide plate and a heat shield part formed below the heater and having a plurality of radiation holes. 2. An inverted frustoconical projection is integrally formed with a reflector, the wind guide is attached to the reflector as a separate body, the heat shield is substantially circular, and the intake hole of the projection is formed. The warm air type electric kotatsu according to claim 1, characterized in that holes are formed at positions facing each other and are attached to the tip end surface portion of the projecting portion. 3. An inverted frustoconical projection is attached to a reflection plate as a separate body, the wind guide is integrally formed with the reflection plate, the heat shield is substantially circular, and the air intake hole of the projection is formed. The warm air type electric kotatsu according to claim 1, characterized in that holes are formed at positions facing each other and are attached to the tip end surface portion of the projecting portion. 4. An inverted truncated cone-shaped protruding portion is integrally formed with a reflecting plate, the wind guide portion is a separate body, and the edge portion of the wind guide portion extends at least above the heater. The warm air type electric kotatsu according to claim 1, further comprising a heat shield part which is attached to the reflecting plate and which is formed of a metal mesh and is arranged below the heater and the protrusion part. 5. A detection element for controlling the electric power supplied to the heater by a detection output according to the detected temperature is heated by the heater blown out from a heat-sensitive air hole provided in an inclined guide portion of a reflection plate. The warm air type electric kotatsu according to claim 1, characterized in that it is arranged on the reflection plate so as to be located in the air flow. 6. A detection element for controlling electric power supplied to a heater by a detection output according to a detected temperature is provided in an upper laminar flow of an air flow flowing between the heater and a reflector and in the heater. The warm air type electric kotatsu according to claim 1, characterized in that it is arranged on the reflector so as to be located laterally.