Mini electric heater. Drawing, description

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Mini electric heater. Tips for the home master

Builder, home master

A heater like a mini-electric heater (IEC) is unlikely to surprise anyone now. You can buy these small-sized and rather convenient household appliances for every taste. But it is not at all necessary to spend money on industrial products, especially imported ones. For example, for a long time I have been serving a self-made and, according to the unanimous recognition of the household, a very aesthetic IEC.

It is based on a nichrome spiral from a tile, an electrophonic motor (hereinafter referred to as an electric motor "for solidity") and a paint can.

As in most industrial analogues, the air flow in this heater creates a homemade multi-blade propeller. Rigidly fixed on the motor shaft, it drives the air through a hot nichrome spiral, mounted on struts made of heat-resistant electrically insulating material. This is in room heating or clothes drying mode. When the heater is turned off, the homemade IEC works like a normal fan.

That is, inaction to such an electrical appliance does not threaten. There is no doubt about its reliability either. The only thing that is required from users is not to forget about fire safety rules.

As already noted, a paint tin can is adapted as a case for a home-made IEC. This is dictated not so much by the availability of the source material, but by the maximum simplicity, and hence the reliability of the entire structure. With any other technical solution, you would have to take care of additional brackets for mounting the electric motor.

Homemade electric heater (click to enlarge): 1 - housing; 2 - thermal insulator (slate, strip L150, 4 pcs.); 3 - electric heater; 4 - insulating insert; 5 - terminal (2 pcs.); 6,8 - legs; 7 - mounting wires in heat-resistant insulation; 9 - screw M4 (4 pcs.); 10 - corner bracket (quantity - according to the number of propeller blades); 11 - propeller; 12 - mounting sleeve; 13 - electric motor rotor; 14-electric motor with a capacitor and a resistor in the winding circuit; 15 - electric cord; 16- general switch; 17 - electric heater switch; 18 - control panel; 19 - speed controller; 20 - self-tapping screw (7 pcs.); 21 - handle; plug and fuse not shown; dimensions of homemade parts - in place

Here, the brackets were not needed, they were replaced ... by the bottom of the can. An air intake window is cut in it strictly in the center and holes are drilled for the motor mounting screws.

The electric motor from the Yunost-301 electrophone came up very well. It is compact, reliable and economical and at the same time develops a sufficiently large torque and high shaft speed. And most importantly, it does not need a step-down transformer or an imported adapter to work in a household network.

In particular, this electric motor, which has only two windings, can be connected to a 220 V household network according to the scheme with a K-40P capacitor with a capacity of 1 μF and a PE-7,5 resistor with a resistance of 1,2 kOhm. And to make such a device more convenient to use, small improvements have been introduced in the form of a variable resistor SP (1 W, 680 Ohm) for adjusting the air flow rate and a heater control toggle switch.

The propeller is cut from tin can. The number of blades is chosen at will - I limited myself to five. Such a propeller is mounted on the motor shaft with the help of simple brackets (pieces of steel angle) and a sleeve made of the same tinplate. Soldering - tin solder.

Nichrome heater - from an inexpensive electric stove. In the heater, this spiral is placed on heat-resistant slate extensions-thermal insulators, in which holes of the appropriate diameter and a central (subassembly into a spike) rectangular cut are made. Moreover, the length of the latter in a pair fastened in the form of the letter X is twice as large as that of the cruciform version.

For convenient connection of the heater to IEC, special terminals are provided. In the heater, they are located at the bottom of the can body, on a special fiberglass panel.

In the upper part of the air intake end of the MEK, a control panel with a fuse (not shown in the assembly sketch), a speed controller for the motor shaft, toggle switches for turning on the household appliance, both with and without a heater, is fixed on self-tapping screws.

To make this whole structure stable, legs are screwed on the bottom of the case, and a carrying handle is provided on top. The mass of a home-made electric heater is slightly more than a kilogram. The power consumption depends mainly on the heater. In this embodiment, it is about 100 watts.

Author: A.Klochkov

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