JPS58210430A - Electrical foot warmer (kotatsu) - Google Patents

Abstract

PURPOSE:To improve the visual heating characteristic of the titled warmer and to reduce the thickness of its heating unit by a method wherein a non-incandescent type heater having a high heat generating capacity such as a cord heater with a small thickness and a low voltage illuminating lamp having a low heat generating capacity are provided in the heating unit and the heater and the lamp are connected in series with each other. CONSTITUTION:A foot warmer is formed of a frame 1 havng a ceiling plate 3, a plurality of support legs 4 and a heating space 5 therewithin and the heating unit 6 attached to the ceiling plate of the frame 1. Further, the non-incandescent type heater having a high heat generating capacity such as the cord heater 7 of a comparatively small thickness, the low voltage illuminating lamp 11 of a low heat generating capacity and a protective net 12 are provided in the heating unit 6. Then the heater 7 and the lamp 11 are connected in series with each other. As a consequence, it is possible to prevent one from getting burnt.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improved structure of an electric kotatsu, and in particular to a thinner heater unit and simultaneous visual heating and radiant heating. It is something to do.

Recently, there has been a trend toward increasing the heating space within the frame of ventilated kotatsu, thereby increasing the movement range of the warmer's feet. As a specific means to increase this heating space, a small diameter so-called quartz heater, in which a coiled heater wire is inserted into a ceramic pipe, is installed on the top plate of the frame. Although it is possible to reduce the diameter of the heater itself, since the radiant heat of the quartz heater is high, it is necessary to separate the protective net from the heater by a large distance, which causes the overall thickness of the heater unit in the vertical direction. That is, when the protective net is brought closer to the heater, it is possible to make the heater unit thinner, but the temperature of the protective net rises and there is a risk of burns.

Incidentally, there are some small-diameter heaters called so-called cord heaters for heating purposes, which minimize the thickness of the heater unit. There was no heating and the heating effect was low.

The present invention improves the above points and will be explained below based on the drawings. FIG. 1 shows a side partial sectional view. 11) has a square storage recess in the center 12)? A top plate (3) having a plurality of support legs 141141+41 provided at the corners of the top plate
It is a rectangular frame with 141 and a heating space (5
) is formed. (6) is a rectangular heater unit installed in the storage recess (2), which has a relatively small thickness and a small diameter, and is a non-red-hot heater such as a cord heater arranged in a spiral or meandering manner on the bottom surface of the mounting plate. A type heater with a high calorific value (
7), a blower 11 consisting of a motor (8) and a fan (9) installed in the center, a low heat generating illumination lamp U installed in an annular shape near the blower, and a protective screen covering the lower part of each member. It consists of. The illumination lamp +tn is low 1! The lamp emits red light, for example, with a power of about 12 cm and a power of about 40 W, which can sufficiently illuminate the inside of the heating space (5).

Figure 2 shows the electric circuit, C13 is a thermostat installed in the heater unit (6) and set to a desired temperature (+41 is a series circuit of diode 05 and resistor (161 and light emitting element (l'rI)). The energization display circuit, α&
is a temperature fuse, and C19 is a power switch. Then, [source switch al, temperature fuse cod and lighting lamp t
111, heater (7), and thermostat TT3+ are connected in series, and the feeder 4G is the old lighting lamp) and heater 1.
7) Connected in parallel to the main stand 1131.

Next, we will discuss the operation. Power switch (L9i.

-Z (181-Lighting lamp 1111-Heater (7)r
When the valve is activated, the flow heater (7) generates heat and performs all radiant heating, and the inside of the heating space (51) is illuminated in red by lighting up the lighting lamp (old) to perform visual heating.

Here, the piezo current becomes a large current of 4 to 6 A, and the lighting lamp 1
11F'3 as well, the voltage across the lamp is set so that the voltage drop occurs due to the internal resistance of the heater (7) and its rated pressure force 9 is not small. For example, a heater (
7) The rated voltage 1 calorific value r is 100V-500W, and the rated voltage 1 calorific value of the lighting lamp I is 12V-4QW, and the voltage of the lighting lamp μml is about 6V? When the power is set to be applied, the illumination lamp u11 will be lit with a heat output of about 25W, and the heater (7) will generate heat with a heat output of about 400W. In this way, low voltage and low heat generation lighting lamp σlli
Is it possible to extend the lifespan by several times to several tens of times by using the heater's internal resistance and C engineering at a lower VC voltage? It can be measured. This theoretical formula is as follows.

L (life) = LO (π) Here, LO is the life (H) when using rated soil vO is the rated voltage (V) ■ is the applied voltage (1) at the time of life (L). The rated life is several hundred hours to 15
Even if it is for 00 to 200 o hours, it will have a long life of about 10,000 hours by reducing the applied current.

In the case of the present invention, a cord heater is used as a heater, but a sheathed heater or mica heater that is non-red-emitting and has a small thickness may also be used.

As described above, the present invention has a frame body which has a top plate and a plurality of support legs, and which forms a sword mouth hot air [1] inside, and a heater unit provided on the top plate part of the frame body to The unit is equipped with a non-red-hot type heater with a high heat generation lid, such as a cord heater with a relatively small thickness, a low voltage and low heat generation illumination lamp, and a protection net, and the heater and the illumination tube are connected in series. Since it is connected, a non-incandescent heater with a relatively small thickness is used for radiant heating, and a lighting lamp is used for visual heating, so radiant and visual heating can be obtained at the same time. Since it can be made relatively compact and the lighting lamp is used simply for visual heating, the lamp itself can bring the low temperature and the HV protection net close together.Therefore, the heater unit can be made thinner and the heating space can be set larger.Also, the lighting By connecting the lamp in series with the heater, the applied pressure (5) will be below the rated voltage and the life span can be significantly extended.

[Brief explanation of the drawing]

FIG. 1 is a side partial sectional view of the electric kotatsu of the present invention, and FIG. 2 similarly shows the electric circuit. (11...frame body, 13)...top plate, 14+1411
41141...Support leg, 15)...Heating air 1116
1... Heater unit, (71... Heater. Till... Lighting lamp.

Claims (1)

[Claims] (11) Consists of a frame with a top plate and multiple support legs and a heating space formed inside, and a heater unit installed on the top plate of the frame. An electric kotatsu comprising a non-red-hot type heater with a high calorific value such as a heater, a lighting lamp with a low voltage and low calorific value, and a protective net, and characterized in that the heater and the illuminating lamp are connected in series.