CN2179682Y

CN2179682Y - Electrical heater

Info

Publication number: CN2179682Y
Application number: CN 93231793
Authority: CN
Inventors: 隋恒利
Original assignee: Individual
Current assignee: Individual
Priority date: 1993-09-06
Filing date: 1993-09-06
Publication date: 1994-10-12
Anticipated expiration: 2003-09-06

Abstract

The utility model relates to an electrical heater which can be used as a heat source for drying, or baking or plastic processing. The outer shell and the upper and lower ends covers of the electrical heater are all provided with a sandwiched wall heat insulating layer, the inner circumference of the shell is evenly distributed with quartz tubes, and electrical stove wires are arranged inside the tubes; one end of each electrical stove wire is knotted into a joint to be led out, the other end of each electrical stove wire is knotted into a joint in groups to be led out, and each group of electrical stove wire is distributed evenly at the inner circumference of a sleeve tube. The utility model can conveniently realize power shifting by the different connecting ways of a power supply, and without a pressure regulator, the service life and energy saving effect of the utility model is obviously superior to the similar kind of products at present.

Description

Electrical heater

The utility model relates to a kind of electrical heating elements, can be used as the thermal source in oven dry, baking vanish and the plastic processing.

Electric heater in the industrial production is of a great variety, wherein advanced is a kind of quartzy Electrothermal ring that just occurs recently, its housing by the sleeve of strap clamp parietal layer and be buckled in the sleeve two ends and also the ring-type end cap of strap clamp parietal layer constitute, the internal layer of its middle sleeve is made by mica sheet, fill asbestos insulation thing in the wall-sandwiched layer, near the some quartz ampoules that are axial installation of the circumference uniform distribution of internal layer, the helical form electric furnace heating wire is housed in the pipe, sleeve outer wall is equipped with the binding post that energized is used, and each electric furnace heating wire is that order is serially connected on the binding post.This electric heater is bigger slightly than iron sheet heating collar, cast aluminium heating collar and carborundum heating collar volume commonly used at present, but owing to adopted quartz ampoule, not only strengthened insulation safety, also obviously improved thermal radiation capability, increased heat-insulation layer in the sleeve and, effectively reduced heat and scattered and disappeared naturally near the mica thermal insulation layer of quartz ampoule, mica sheet also has certain heat reflection function, heat is assembled to the center, thereby improved the heat efficiency significantly, reduced energy consumption.In addition, because the reinforcement of insulation also makes its heat load ability increase substantially (improving 3～4 times than above-mentioned heater commonly used approximately), therefore can be used as the high power density electric heating element and use.Simultaneously, because quartz ampoule is convenient to change, also make its life-span improve (2～3 times) greatly.In use, warm-up phase requires high power, with minimizing warm-up time and saving electric energy, and after temperature reaches job requirement, require suitably to reduce power again, exempting unnecessary energy consumption or working substance had a negative impact, thus require power will be convenient to adjust, but since its electric furnace heating wire be connected in series, adjusting power can only realize by changing supply voltage, promptly necessary additional supply voltage adjusting device has not only increased equipment complexity coefficient, volume and cost, has also increased extra electric energy loss.Next is that mica sheet is easy to break, damages and wears out, and is difficult for again changing, and has influenced the life-span, and it is also unsatisfactory to put off until some time later its heat reflection.In addition, mica sheet is not considered the focal length of heat reflection near quartz ampoule, the heat build-up poor effect, and these have all influenced the further raising in the heat efficiency and life-span.

Task of the present utility model provide a kind of need not with voltage regulation of electric power sources equipment, can adjust the energy-conservation electric heater of power easily.Also to provide four kinds on the above-mentioned purpose basis, can further improve life-span and the heat efficiency to reach the electric heater of better energy-saving effect.

Above-mentioned task can be finished in the following way.

Design a kind of electric heater, its housing by the sleeve of strap clamp parietal layer and be buckled in sleeve two ends and also the ring-type end cap of strap clamp parietal layer constitute, fill the insulation thing in the wall-sandwiched layer, the some quartz ampoules that are axial installation of sleeve lining circumference uniform distribution, the helical form electric furnace heating wire is housed in the pipe, sleeve outer wall is equipped with the binding post that some energized are used, it improves main points and is, one end of the electric furnace heating wire in each quartz ampoule fuses and is connected to jointly on the binding post, the other end of each electric furnace heating wire then respectively tap and divide be connected on some binding posts, the electric furnace heating wire that whenever is connected on the same binding post should be distributed in week in the sleeve.

During use, two power supply lead wires or plug can be connected on the different binding posts (in fact available some electricity turn round be equipped with contactor realize), make the in parallel or series connection of each electric furnace heating wire grouping realize the shift of power.Requiring every group of electric furnace heating wire should be distributed in interior week of sleeve in the scheme is that the circumference heat all can evenly send under any wiring state.Should mention a bit that also such scheme is pointed out that heating collar, if this circle is launched then to can be changed into heating plate.As mentioned above, it is convenient, reliable that this heater is not only adjusted power, saved voltage regulator, reduced cost, also reduced energy consumption, improved the heat efficiency.

For further improving its life-span and the heat efficiency, reach better energy-saving effect, can be on the such scheme basis, make structural further improvement, for example, the inwall available metal plate of sleeve is made, its inner surface coating is with reflector layer (as silver-plated, mercury or bright chromium etc.), also can directly adopt corrosion resistant plate to replace mica sheet with reflecting effect, so not only increased the rigidity and the intensity of heating collar, and not fragile and aging, obviously prolonged the life-span, the more important thing is and improved the thermal radiation albedo, reduced the heat loss.Also can leave certain distance between with sleeve lining and quartzy tube wall on above-mentioned two kinds of scheme bases in addition, preferably about 12-16mm, so not only avoided the inwall steel plate premature damage of being heated, also reduced outside heat conduction, the heat reflection focusing power is strengthened even more noteworthy, also can improve the heat efficiency.

Accompanying drawing has provided an embodiment of the present utility model:

Fig. 1 is its axial A-A cutaway view;

Fig. 2 is its cross section B-B cutaway view;

Fig. 3 is an electric furnace heating wire mode of connection schematic diagram.

Can see that by Fig. 1 and Fig. 2 this heater housing is made of with the upper and lower end cap 1 of the ring-type that also has wall-sandwiched layer that is buckled in its two end the sleeve 2 of strap clamp parietal layer, stuffed heat insulated insulation asbestos layer 3 in the wall-sandwiched layer, be axial installation ten six roots of sensation quartz ampoules 5 in a distance of sleeve lining 4 (this example is 14mm), helical form is housed and through high temperature oxidation process in the pipe, the surface forms the electric furnace heating wire 6 of one deck dielectric film, and blue or green external face is equipped with binding post 7.For ease of installation and maintenance, sleeve can be fixed together by two semicircles and constitute, and its junction preferably serves as a contrast with the high-temp glue asbestos cloth, runs off thus to reduce heat.Its inwall 4 is to adopt cold rolled stainless steel sheet to make.Its wiring characteristics as seen from Figure 3, its electric furnace heating wire is divided into two groups, three binding posts are arranged, be respectively a, b and c, with 16 uniform on circumference quartz ampoules (is graphic simplicity, only draw 6 quartz ampoules on Fig. 3 and only be signal) in electric furnace heating wire one end form any and be connected on the binding post a, eight uniform electric furnace heating wires (scheming last three) other end is formed any and is connected on the binding post b, other electric furnace heating wires are connected on the binding post c for another, if the all-in resistance of every group of electric furnace heating wire is R, supply voltage is V, according to the electricity formula:

P＝ (V ²)/(R)

Three kinds of power P can appear during use:

A, to establish power when power supply is connected to a point and b point (or c point) be P;

B, power supply is connected to a point and b-c point (b and c point couple together with lead), then power is 2P;

C, power supply is connected to b point and c point, then power is P/2.

Thereby can realize the third gear different capacity.

Claims

1, a kind of electric heater, its housing by the sleeve (2) of strap clamp parietal layer and be buckled in sleeve two ends and also the ring-type end cap (1) of strap clamp parietal layer constitute, fill insulation thing (3) in the wall-sandwiched layer, the some quartz ampoules (5) that are axial installation of sleeve lining (4) circumference uniform distribution, helical form electric furnace heating wire (6) is housed in the pipe, sleeve outer wall is equipped with the binding post (7) that some energized are used, it is characterized in that, one end of the electric furnace heating wire in each quartz ampoule fuses and is connected to jointly on the binding post, the other end of each electric furnace heating wire then respectively tap and divide be connected on some binding posts, the electric furnace heating wire that whenever is connected on the same binding post is distributed in week in the sleeve.

2, electric heater according to claim 1 is characterized in that the inwall (4) of sleeve (2) is made by metallic plate, and its surface has reflective coated layer.

3, electric heater according to claim 1 is characterized in that the inwall (4) of sleeve (2) is made by the corrosion resistant plate with reflecting effect.

4, according to claim 2 or 3 described electric heaters, it is characterized in that, leave the 12-16mm distance between sleeve lining (4) and quartz ampoule (5) wall.