JPH0490449A - Hot air type electric kotatsu (foot warmer) - Google Patents

Abstract

PURPOSE:To make it possible to set various kinds of heaters or 'kotatsu' by laying out a protection plate bored with a plurality of holes in the lower part of a ring-shaped heater, and installing a ring-shaped wind guide section, which surrounds the ring-shaped heater and inclines itself against a reflected plate at a specified angle, to the protection plate so that its tip may approach the surface of the reflected plate. CONSTITUTION:A protection plate 70 bored for a plurality of holes 71a, to 71c is laid out in the lower part of a ring-shaped heater 50 and it is arranged to surround the ring-shaped heater 50. At the same time, a ring-shaped wind guide section 75 inclined to a reflected plate 20 at a specified angle, is installed to the protection plate so that its tip may approach the surface of the reflected plate 20. It is, therefore possible to change the inclination angle of the wind guide section 75 properly during manufacturing or after assembling. For example, if there is available the protection plate provided with the wind guide section 75 having various kinds of inclination angles responding to the sizes and shapes of the frame of a foot warmer heater, it will be possible to supply various kinds of hot air type electric heater easily by selecting the above factors properly. In addition, as a rib 72 or 74 is formed on the protection plate 70, the protection plate can be formed with a thin steel plate. Therefore, it is possible to maintain a specified strength even when hole 71a is formed at a bending section.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a hot air type electric kotatsu for indoor heating equipment, and particularly to a hot air type electric kotatsu equipped with a fan and an annular heater arranged so as to surround the fan. It depends.

[Prior art] As a conventional hot air type electric kotatsu, for example,
Publication No. 3032 describes an electric dowel kotatsu in which a reflector is provided at the center of the lower surface of a dowel frame, an annular heater is disposed on the underside of the reflector, and an electric blower having a fan is disposed in a space surrounded by the annular heater. is disclosed. The publication states that with the above configuration, hot air can be circulated evenly throughout the heating area inside the kotatsu, and the space surrounded by the annular heater can be used effectively, thereby avoiding an increase in the size of the mechanism. It is said that

In addition, in Japanese Utility Model Publication No. 46-31430, there is a J! A hot air type with an I-shaped cylinder, an electric motor and a centrifugal impeller mounted inside the cylinder, and an annular electric heating element arranged concentrically on the outside of the cylinder to force warm air to circulate inside the tank. A kotatsu turret is exposed. The above-mentioned Jikko Sho 43-
In Japanese Utility Model Publication No. 13032, a flat reflecting plate is used, whereas in Japanese Utility Model Publication No. 46-31430, the peripheral edge of the reflecting plate is inclined to form a wind guide surface.

[Problem to be solved by the invention] In the hot air type electric kotatsu described in any of the above publications,
An annular heater and a fan are provided, and the radiant heat from the former and the warm air from the latter combine to uniformly heat the inside of the kotatsu. The above-mentioned inclination angle of the wind guide surface is a requirement for setting the air flow formed by the fan, and can be set as appropriate depending on the size, shape, etc. of the tower to which the heater unit is installed. is necessary. However, in conventional hot-air electric kotatsu, a wind guide surface is formed on the reflector plate that functions as a support base to support the motor, etc., so it became necessary to set the inclination angle to a different angle after manufacturing started. In this case, the design of the heater unit as a whole needs to be changed. Furthermore, in order to set wind guide surfaces with different inclination angles depending on the size, shape, etc. of the tower, various heater units must be prepared, which increases costs.

SUMMARY OF THE INVENTION Therefore, the present invention provides a hot air type electric kotatsu equipped with a wind guide part that can appropriately set the inclination angle of the wind guide surface without forming an inclined wind guide surface on a reflector plate equipped with a motor or the like. With the goal.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a reflector disposed on the frame of a tower, a motor fixed approximately at the center of the reflector, and a rotating shaft of the motor. In a hot-air electric kotatsu equipped with a fan fixed to a fan and an annular heater arranged to surround the fan, a protection plate with a plurality of holes is disposed below the annular heater, An annular wind guide portion surrounding the heater and inclined at a predetermined angle with respect to the reflecting plate is provided on the protecting plate so that its tip is close to the surface of the reflecting plate.

In the hot air type electric kotatsu of the present invention, it is preferable that the air guide section is formed integrally with the protection plate.

Further, the protection plate is a dish-shaped member formed by forming a substantially central part of a rectangular plate material into a circular bulge and disposed to accommodate the annular heater, motor, and fan in a recess, and the bottom periphery of the dish-shaped member It is preferable that some of the plurality of holes are drilled at predetermined intervals over the entire circumference, and the wind guide portion is formed by cutting and bending.

Furthermore, the protection plate is a dish-shaped member formed by forming a substantially central part of a rectangular plate material into a circular bulge and disposed to accommodate the annular heater, motor, and fan in a recessed part, and a bottom part of the dish-shaped member. Preferably, a plurality of ribs are formed that extend radially around a position facing the rotation axis of the motor, and the plurality of holes are concentrically formed between the plurality of ribs.

Further, ribs may be formed on the dish-shaped member constituting the protection plate at bent portions on extensions of the plurality of radially extending ribs.

[Function] In the hot air type electric kotatsu having the above configuration, the protective plate is provided with an annular wind guiding part that is inclined at a predetermined angle with respect to the reflecting plate, and the tip of this wind guiding part is close to the surface of the reflecting plate. As such, a protection plate is disposed below the annular heater. When the annular heater generates heat, radiant heat is radiated downward and reflected downward by the reflector. Then, when the motor is driven to rotate and the fan rotates, an air flow is generated, and the air in the tower below flows in, is heated by the annular heater, and is guided to the wind guide section and blown out. As a result, the blown air becomes warm air, which, together with the radiant heat mentioned above, uniformly warms the inside of the tower.

[Embodiments] Hereinafter, preferred embodiments of the hot air type electric kotatsu of the present invention will be described with reference to the drawings.

FIGS. 1 and 2 show an embodiment of the present invention, in which a frame body having a substantially square shape in plan view is constituted by a frame 10 connected to an outer frame member (not shown) of a tower, and A top plate 11 made of heat insulating material is provided. The heater unit 1 is housed in a space formed below the top plate 11, and is supported by a rack 10 so as to be removable.

The heater unit 1 includes a reflecting plate 20 made of a steel plate and having a substantially square shape in plan view and arranged to face the top plate 11 with a predetermined gap therebetween. A first recess 21 in the shape of a truncated cone that protrudes upward, that is, toward the top plate 11 and opens downward, is formed at approximately the center of the reflector 20 of this embodiment. Also, this first
A second recess 22 that is continuous with and shallower than the recess 21 is formed, and opens laterally at the outer edge of the reflecting plate 20. Furthermore, as shown in Figure 3@1, the first and second recesses 21
, 22, a third recess 23 is formed which is concentric with the first recess 21 and has a truncated conical shape and is shallower than the second recess 22. A motor 30 is installed at the bottom of the first recess 21 of the reflector 20.
is fixed, and most of the core 32 and coil 33 constituting the motor 30 are housed in the first recess 1 . A rotating shaft 31 of the motor 30 extends downward, and a fan 40 is connected to the tip thereof.

As shown enlarged in FIGS. 3 and 4, the fan 40 includes a circular dish-shaped support portion 4 made of an aluminum plate or a steel plate.
1, and a plurality of blade portions 42 extending in the radial direction are bent at predetermined intervals on the outer circumference, and in this embodiment, a total of 18 blade portions 42 are formed radially. There is. The height h in the axial direction of the dish-shaped support part 41 of these blade parts 42 is set to a value smaller than the thickness t of the dish-shaped support part 41.

A support metal fitting 41a having a hole drilled in the axis is fixed through the center of the dish-shaped support part 41, and the rotating shaft 31 of the motor 30 is fitted into this hole, and the side of the support metal fitting 41a is fixed. It is fixed by screws 41b that are screwed together from both sides. The side surface 41s of the outer periphery of the convex portion of the dish-shaped support portion 41 is inclined at a predetermined angle in the axial direction from the open end toward the bottom surface over the entire circumference, and forms a reflective surface for an annular heater 50 to be described later. .

Note that the side surface 41s may be formed perpendicular to the bottom surface of the dish-shaped support portion 41 without being inclined to the bottom surface.

When the fan 40 is fixed to the rotating shaft 31 of the motor 30, the blade portion 42 is attached to the center of the reflector 20 as shown in FIG.
Since the blades 42 are disposed so as to face the bottom surface of the recess 23 with a predetermined gap therebetween, the blades 42 are prevented from coming into contact with the reflecting plate 20 . As described above, the third recess 23 is formed to prevent the blade portion 42 from coming into contact with the reflecting plate 20 due to eccentricity of the rotating shaft 31, etc.
The fan 40 may be fixed to the surface of the reflecting plate 20 with a predetermined gap without forming the third recess 23.

An annular heater 50 is arranged so as to surround the fan 40 and parallel to the reflection plate 20.

For example, a quartz tube lamp heater is used as the annular heater 50, and its configuration is well known, so a description thereof will be omitted. As shown in FIGS. 1 and 2, the second recess 2 of the reflector 20
A convex portion 24 is formed as a mounting seat in the center of the annular heater 50, and a mounting portion 51 is screwed onto the top surface of the convex portion 24. Supported.

The width of the convex portion 24 in the horizontal direction is narrower than the width of the second recess 22, so that communication between the first recess 21 and the second recess 22 in the horizontal direction is not obstructed. In addition, the annular heater 5
The portions other than the mounting portion 51 of 0 are also supported by the reflecting plate 20 via support pieces (not shown) as necessary. Further, a connector unit 60 electrically connected to the annular heater 50 and the motor 30 is provided on the bottom surface of the second recess 22 of the reflection plate 20.
is fixed, and power is supplied to the annular heater 50 and the motor 30 from a power source (not shown) through this connector unit 60.

A protective plate 70 is provided on the reflective surface of the reflective plate 20, that is, the lower surface in FIG.
are polymerized and joined by a plurality of screws 70a as shown in FIG. The protection plate 70 is a dish-shaped member formed of a rectangular steel plate as shown in FIGS. 5 and 6,
A plurality of holes 71a, 71b, and 71c are concentrically drilled in the bottom, and a circular bulge is formed to surround the motor 30, fan 40, and annular heater 50 with a predetermined gap. It protects from impact and also functions as a heat shield for the annular heater 50. Note that FIG. 6 shows only the upper half because the protection plate 70 is symmetrical.

The protective plate 70 is formed with ribs 72 that extend radially and are slightly higher at the center of the bulge than the outer periphery, and have lips 73 and 74 formed at the bent portions of the periphery. In addition, the protective plate 70
The hole 71a at the bottom periphery of the hole 71a is formed by bending the bottom member inward by so-called cutting and bending to form an annular wind guide portion 75 centered around the rotating shaft 31 of the motor 30 and inclined at a predetermined angle with respect to the reflecting plate 20. has been done. That is, the wind guide portion 75 is formed to face the annular heater 50 as shown in FIG.
The holes 71a at the bottom periphery function as hot air blowing holes as described later. The hole 71b is located below the annular heater 50 and mainly functions as a radiation hole that relieves radiant heat.
c is located below the fan 40 and functions as a suction hole.

The wind guide section 75 is provided so that its tip is close to the surface of the reflecting plate 20, but an annular groove is provided in the reflecting plate 20 at a position opposite to the tip of the wind guide section 75 so as not to contact the reflecting plate 20. 25 is formed. In this embodiment, the wind guide portion 75 is formed integrally with the protection plate 70, but it may be formed separately from the protection plate 70 and joined.

After the protection plate 70 is overlapped and bonded to the reflection plate 20 as described above, the protection net 80 is arranged and fixed on the sides by a pair of locking members 12a and screws (not shown) as shown in FIG. , a heater unit 1 is constructed. In this embodiment, the protective net 80 is made up of a plurality of metal wires arranged in parallel and a plurality of parallel metal wires intersecting these wires, which are joined by welding, but for example, a lath net can also be used. The protection net 80 in this embodiment is a general term for all of these as long as they protect the accommodated components from IS.

The heater unit 1 having the above-described structure is mounted on the truss 10, and is removably supported on the truss 10 by the shaft portions of a pair of locking members 12a on the negative side and by a pair of bolts 12b on the other side. When power is supplied from a power source (not shown) via the connector unit 60, the annular heater 50 generates heat. The radiant heat from the annular heater 50 is radiated downward through the hole 71b of the protection plate 70, and is also radiated downward through the reflective surface of the reflection plate 20, the wind guide portion 75 of the protection plate 70, and the fan 4.
0 is reflected downward by the side surface 41s. Note that this radiant heat is appropriately shielded by the protection plate 70. On the other hand, when electric power is supplied to the motor 30 and the motor 30 is driven, the fan 40 fixed to the rotating shaft 31 rotates. In response, an air flow is generated by the blade portion 42 of the fan 40, and the air in the tower below the heater unit 1 becomes the intake air Wi shown in FIG. The air is guided to the wind guide section 75 via the heater 50 and is blown out from the hole 71a as the blown air WO. This blown air WO is heated by the annular heater 50 to become hot air, and together with the radiant heat downward from the heater unit 1 from the annular heater 50, the inside of the tower is uniformly heated.

The air that has cooled inside the tower becomes intake air Wi and is drawn into the heater unit 1, and the above-described operation is repeated. In this way, the air inside the tower is warmed, and when it reaches a predetermined temperature, the annular heater 5 is heated by a temperature controller (not shown).
0 is controlled, and the air inside the tower is maintained at a predetermined temperature.

As described above, the wind guide portion 75 is not provided on the reflector 20 but is provided on the protection plate 70 so as to be inclined at a predetermined angle with respect to the reflector 20. can be easily formed. Therefore, the inclination angle of the wind guide portion 75 can be changed as appropriate during manufacturing or after assembly. For example, if a protective plate 70 equipped with a wind guide part 75 of various inclination angles is prepared according to the size and shape of the tower, by selecting these appropriately, various types of warm air type electric kotatsu can be created. can be easily provided. Further, since the ribs 72 to 74 are formed on the protection plate 70, it can be formed from a thin steel plate, and even if the hole 71a is formed in the bent portion, a predetermined strength can be ensured.

[Effects of the Invention] Since the present invention is configured as described above, it produces the effects described below.

That is, in the hot air type electric kotatsu of the present invention, the protective plate is provided with an annular wind guiding part that is inclined at a predetermined angle with respect to the reflecting plate, and the protective plate is arranged such that the tip of the wind guiding part is close to the surface of the reflecting plate. Since the annular heater is disposed below the annular heater, a wind guide surface having a predetermined inclination angle can be easily formed. especially,
The wind guide part is provided on the protection plate, and there is no need to form an inclined surface on the reflection plate. Therefore, when changing the inclination angle of the wind guide part, only the protection plate needs to be replaced, and the inclination angle can be easily changed. Can be set. Also, when setting the wind guide part to a predetermined inclination angle in advance during manufacturing, only the protection plate needs to be operated, so we prepare protection plates with various wind guide parts and place them below the annular heater. Various aspects can be set just by arranging them.

Furthermore, if the wind guide section is formed integrally with the protection plate, it can be formed even more easily. In particular, if the wind guide part is formed by cutting and raising the bottom periphery of the dish-shaped member, it will save material, and it can be done at the same time as drilling multiple holes, so manufacturing costs can be reduced. can be reduced.

Further, in the case where the protective plate is provided with radial ribs, it can be formed from a thin plate material, thereby making it possible to reduce the weight and cost. In particular, in the case where ribs are formed on the bent portion of the dish-shaped member, a predetermined strength can be ensured even when a hole is formed in the bent portion.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of the main parts of an embodiment of the hot air type electric kotatsu of the present invention, Fig. 2 is a partially cutaway plan view of the heater unit, and Fig. 3 is a plan view of the fan. Figure 4 is the same,
Side view of the fan, ¥S5 figure is the same, side view of the protection plate, 6th
The figure is a plan view of a part of the protection plate. 1... Heater unit, 10... Frame (frame body). 11...Top plate, 20...Reflector, 21...
・First recess, 22...Second recess, 23.
...Third recess. 30...Motor, 31...Rotating shaft, 40...Fan. 41...Dish-shaped support part, 42...Blade part. 50... Annular heater, 60... Connector unit. 70-! Protective plate, 71a, 71b, 71cm holes. 72.73.74...Rib, 75...Wind guide part. SO-・Protection net patent applicant Toyotaka Sangyo Co., Ltd.

Claims (5)

[Claims] (1) A reflector arranged on the frame of the tower, a motor fixed to the approximate center of the reflector, a fan fixed to the rotating shaft of the motor, and an annular heater arranged to surround the fan. In the hot air type electric kotatsu, a protective plate having a plurality of holes is disposed below the annular heater, and an annular protective plate that surrounds the annular heater and is inclined at a predetermined angle with respect to the reflector plate. A warm air type electric kotatsu, characterized in that a wind guide part is provided on the protection plate so that the tip thereof is close to the surface of the reflection plate. (2) The warm air type electric kotatsu according to claim 1, wherein the air guide portion is integrally formed with the protection plate. (3) A dish-shaped member in which the protection plate is a rectangular plate material with a substantially central part formed into a circular bulge and disposed so as to accommodate the annular heater, motor, and fan in a recessed part, the dish-shaped member 3. A warm air type electric kotatsu according to claim 2, wherein some of the plurality of holes are bored at predetermined intervals around the entire circumference of the bottom of the kotatsu, and the air guide portion is formed by cutting and raising. . (4) The protection plate is a dish-shaped member in which a substantially central part of a rectangular plate material is formed into a circular bulge and arranged so as to accommodate the annular heater, motor, and fan in a recessed part, the dish-shaped member A plurality of ribs are formed on the bottom of the motor and extend radially around a position facing the rotation axis of the motor, and the plurality of holes are concentrically formed between the plurality of ribs. The warm air type electric kotatsu according to claim 1. (5) The hot air according to claim 4, wherein ribs are formed on the dish-shaped member constituting the protection plate at bent portions on extensions of the plurality of radially extending ribs. Electric kotatsu.