CN100424424C - Air convection type energy-saving electric heater - Google Patents

Abstract

An energy-saving electric heater using air convection heating. Its technical feature is that it uses a thin metal strip instead of the conventional resistance wire or other electric heating materials as the heating body, and is suspended reciprocatingly in the horizontal direction on the ceramic suspension brackets on both sides of the shell. The upper and lower 2-3 floors directly heat the air without passing through the intermediate medium. The ceramic suspension bracket is installed obliquely to keep a certain inclination in the width direction of the heating body, which is convenient for contact with the rising air and air convection. The 45° air guide plate guides the hot air to escape from the louver-shaped hot air outlet in front of the electric heater. The temperature of the heating body is about 400°C. Using the principle that the air expands after being heated and the pressure increases, the hot air automatically generates convection , the effect of forced ventilation can be achieved without forced ventilation, and the outside is a protective shell.

Description

Air convection type energy-saving electric heater

Technical field

The invention is an energy-saving electric heater utilizing air convection for heating, and the technical field belongs to the field of daily life.

Background technique

At present, the heating methods using electric heating can be summarized into three types: low-temperature floor radiant heating, ceiling electric heating film (electric heating cable) heating and vertical radiator heating. In fact, indoor heating is to increase the indoor temperature through heating equipment, and the increase of indoor temperature depends on the convection of indoor air. Low-temperature floor radiant heating is separated by a floor, and the heat is dissipated slowly, which is not conducive to air convection; ceiling heating is actually heating the floor of the upper floor because the hot air rises, which is not conducive to air heat exchange and convection. The effect is poor and the cost is high. The heating method of vertical radiators generally uses oil or water as the intermediate medium, which needs to be heated to a higher temperature, the heat is locally concentrated, and the vertical structure is not conducive to the heat exchange of air, so it also consumes a lot of power and has poor effects , It will not be warm without the electric heater. It can be seen that in order to ensure a good indoor heating effect, the electric heater heating requires the indoor air to convect as soon as possible to make the indoor air heat up quickly; in order to save energy as much as possible, it is required to improve the electric-heat conversion efficiency and heat exchange with the air as much as possible. The efficiency, and the electric heater must make the indoor temperature uniform, avoid the local concentration of heat, and also need indoor air convection. The object of the present invention is to create an energy-saving electric heater that uses air convection for heating, rapid indoor temperature rise, good heating effect, and high electric-thermal conversion efficiency and heat exchange efficiency with air.

Contents of the invention

In order to overcome the disadvantages of existing electric heaters, the present invention provides an energy-saving electric heater that utilizes natural convection of air without forced ventilation, and has particularly high electric-to-heat conversion efficiency and heat exchange efficiency with air.

The technical scheme that the utility model solves its technical problem is:

Use thin metal strips instead of the previous resistance wires or other electric heating materials as the heating body, and hang reciprocatingly on the ceramic suspension brackets on both sides of the shell in the horizontal direction, generally 2-3 layers up and down, directly heating the air without passing through the intermediate medium , The ceramic suspension bracket is installed obliquely, so that the width direction of the heating body and the horizontal direction maintain a certain inclination angle, which is convenient for contact with the rising air and air convection. An air guide plate inclined at about 45° is set above the heating body to guide hot air from the electric heater. The louver-shaped hot air outlet in front of the device escapes, and the temperature of the heating body is about 400°C. Using the principle that the air expands after being heated and the pressure increases, the hot air automatically generates convection, and the effect of forced ventilation can be achieved without forced ventilation. The outside is a protective shell.

The beneficial effects of the utility model are:

1. The thickness of the metal thin strip heating body is quite thin and has a considerable width. The heat consumed by itself is almost negligible, and the electric-thermal conversion efficiency is the highest; at the same time, the heating body has a large enough heating area, which can be used according to the most sufficient and The heating body is installed in contact with the air and meets the requirements of air convection to the greatest extent. The heat exchange efficiency between the heating body and the air is the highest, so as to achieve the purpose of energy saving.

2. The operating temperature of the metal strip heating body is about 400°C, and it is not easy to be oxidized and burned, so it has a long service life and has a semi-permanent life in normal use. It can be used in the same way as a traditional radiator. The heating body is placed inside the shell Protection, not easy to damage, the shell is not hot, and it is safer to use.

3. The hot air guide plate and the hot air outlet are made of non-heat-conducting materials, and heat-insulating materials are used for heat insulation where the hot air passes, so that almost all the heat emitted by the heating body is transferred to the air, increasing the temperature of the hot air , up to 90°C or higher, increase the pressure difference between cold and hot air, strengthen air convection, achieve the effect of forced ventilation without forced ventilation, reduce the energy loss of the blower, and do not produce noise, which is good for sleep and body rest In addition, using the guiding function of the hot air heat conduction plate, the electric heater can be installed in a variety of ways, not only for mobile use, but also for wall-mounted installation, or even embedded in the wall, without occupying indoor space.

Description of drawings

Below in conjunction with accompanying drawing and embodiment the utility model is further described.

Fig. 1 is the structural representation of embodiment example of the present invention

Fig. 2 is a schematic diagram of the heating body suspended on the ceramic suspension brackets on both sides of the casing.

In the figure: Among them: 1—protective shell, 2—metal strip heating body, 3—right ceramic suspension bracket of heating body, 4—hot air guide plate, 5—hot air outlet, 6— - Cold air intake, 7 - Left ceramic suspension bracket of the heating body.

Specific implementation examples

According to Fig. 2, at first the thin metal strip heating body 2 is reciprocally suspended on the left and right ceramic suspension brackets 7, 3 at a certain interval, and then the left and right ceramic suspension brackets 7, 3 are fixed to the shell 1 according to Fig. 1 on both sides. In order to improve the contact between the heating body and the air, when the ceramic suspension bracket is installed in the shell, the bracket plane and the horizontal direction have a certain angle of inclination, so that the metal strip heating body forms a certain angle in the width direction and the horizontal direction, and the cold air When it rises, it directly contacts the heating body. Generally, the heating body can hang 2-3 layers, and the cold air enters the electric heater from the air inlet 6 below. After touching the heating body 2 for the first time, it absorbs the heat of the heating body, the temperature rises, and the volume expands, resulting in rising After the upper layer is heated and pressurized, the hot air reaches the highest temperature and maximum rising pressure and rises rapidly. After the hot air rises to the hot air heat conducting plate 4, it will be folded towards the upper front of the shell, and escape from the hot air outlet 5. Use the hot air heat conduction plate 4 to guide the hot air to escape from the front, so that hanging installation and embedded installation can be adopted. Outside the air outlet, the hot air mixes with the indoor air, and the temperature is lowered to that of normal heating, so it feels as comfortable as normal heating.

The hot air guide plate 4 above the heating body and the hot air outlet 5 are made of heat insulating material, and heat insulation measures are taken where the hot air passes through, and its effect is to prevent the heat of the hot air from being transferred to the metal shell. Because the heat gained by the metal shell means that the air gets less heat, and the heat exchange efficiency between the heating body and the air is greatly reduced; second, although the temperature of the metal shell rises, it only produces local heat concentration and hardly exchanges heat with the air. It is the disadvantage of many electric heaters; third, if the hot air passes through the metal air outlet, it will transfer heat to the metal shell, which reduces the temperature of the hot air. The temperature difference between the hot air and the cold air is small, and the air cannot be convected. stand up. Just because the air guide plate 4 and the hot air outlet 5 are made of heat insulating material, heat insulation measures are taken in the place where the hot air passes through, so that the air convection is accelerated, the indoor temperature rises quickly, and the electric heater will emit heat as soon as the electric heating air is supplied. There is no inertia, and the effect of forced ventilation can be achieved without using forced ventilation to enhance air convection like previous electric heaters.

Because the temperature of the heating body itself is about 400°C, in addition to the long service life and maintenance-free, because the heating body is made of low-resistance material, and it is suspended installation, it has good insulation and is not afraid of water splashing. It can be used for indoor heating and is also suitable for use. For heating in the bathroom, there is no need to set up waterproof splash protection measures.

The outermost part of the electric heater is the protective shell 1 which can be made of metal material or engineering plastics. According to different usage occasions, different shapes are designed. For example, it is rectangular, with a hole at the bottom of the shell as the air intake for cold air, and two holes on the back for suspension. If it is a mobile electric heater, four wheels are installed under the shell to facilitate movement.

Because the air convection of the electric heater is fast and the temperature rises quickly, the electric heater can be turned on after the owner of the room enters the house; the electric heater can also be turned on during the low electricity consumption to heat the room. The entire room is used as a heat storage body. When the electricity consumption peaks, or after the owner goes to work, the electric heater is turned off. Although the indoor temperature gradually decreases, due to the heat storage effect of the room, the temperature required for heating can still be maintained. Using the entire room as a heat storage body, compared with the heat storage effect of a heat storage electric heater, the heat storage effect is not bad, and the characteristics of fast heating, high efficiency and low price are very significant.

The whole electric heater has simple structure, small volume, light weight and low cost.

Claims (2)

1. An air convection type energy-saving electric heater, the outer layer of the electric heater is a shell, characterized in that: a thin metal strip is used as the heating body (2), and the heating body (2) is reciprocally suspended on the shell in the horizontal direction On the ceramic suspension brackets (3) on both sides of the interior, the heating body is suspended from top to bottom in 2 or 3 layers, and the air is directly heated without passing through an intermediate medium. The ceramic suspension brackets (3) are installed obliquely so that the width direction of the heating body Keep a certain inclination angle with the horizontal direction to facilitate contact with rising air and air convection. A hot air guide plate (4) inclined at 45° is arranged above the heating body (2) to guide hot air from the louver-like front of the electric heater. Hot air escapes from the air outlet (5), and the operating temperature of the heating body is 400°C. Using the principle that the air expands after being heated and the rising pressure of the air increases, the air automatically generates convection, and the effect of forced ventilation can be achieved without forced ventilation. 2. The air convection energy-saving electric heater according to claim 1, characterized in that the hot air guide plate (4) and the hot air outlet (5) are made of heat insulating materials, and the place where the hot air passes All use thermal insulation materials.

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