Description
Clamp (ring) micanite heating elements or electric heaters are one of the varieties of ring heating elements widely used in industry for heating cylindrical surfaces. Ring micanite heaters are used to heat a wide range of industrial equipment: heaters for extruders, injection molds, molds, nozzles, material cylinders of injection molding machines, granulators, etc.
A heater of this type consists of a round metal case and a circular heating element located inside the case and insulated from it. Sometimes heaters are used, consisting of two half rings, in which case they are called half rings. The heater body is made of stainless steel and, depending on the heater model, can have different diameters and widths. The heating element is made of high quality Kanthal tape material with high electrical resistivity. The electrical insulation is made of a heat-resistant inorganic material whose characteristics exceed those of micanite and mica.
Specifications
Main technical characteristics
| Minimum inner diameter, mm | 23 |
| Maximum inner diameter, mm | 380 (over in the form of half rings) |
| Minimum width, mm | 18 |
| Maximum width, mm | 300 (over special order) |
| Thickness, mm | 3-4 |
| Maximum electrical power, W / cm2 | 5 |
| Supply voltage, V | up to 450 |
| Heater operating temperature, ° С | 350 |
At the request of the customer, ring heaters of non-standard design with various cutouts, holes, thermocouple clamps, etc. can be manufactured.
For efficient and long-term operation of the mikanite electric heater, it is necessary to ensure tight contact of the working surface of the heater with the surface of the heated object. The condition for tight contact is the absence of protrusions, cavities on the heated surface and a minimum of roughness; this surface must be of the correct shape. In addition, in order to avoid overheating, it is necessary to ensure uniform heat transfer from the entire working surface of the heater; high-temperature assembly paste and crimping devices serve this purpose.
Circular heaters are leaking and cannot function in humid environments. However, due to the metal housing, a small amount of water entering the heater does not harm its operation.
Ring micanite heaters are usually installed on the heated object from the end surface. But in cases where it is not possible to install a heater through the end surface, semi-ring heaters are used. In some cases, during installation, the heater can be extended, it has sufficient flexibility for this.
Types of current leads
1 - terminal block radial
2 - terminal block along the axis;
3 - tangent terminal block;
4 - fork on the box radially;
5 - fork on the box along the axis;
6 - fork tangentially on the box;
7 - closed fork radially;
8 - terminal block in the box along the axis;
9 - tangential terminal block in the box;
10 - pins on the box radially;
11 - pins on the box along the axis;
12 - pins tangentially on the box;
13 - radial thermal conduit in a small box;
14 - thermal conduit in a small box along the axis;
15 - a thermal conduit in a small box tangentially;
16 - thermal conduit in a small box 45 degrees. along the axis;
17 - thermal conduit in a small box 45 deg. tangentially;
18 - radial thermal conduit on the box;
19 - thermal conduit on the box along the axis;
20 - thermal conduit on the box tangentially;
21 - terminal block in the box radially;
22 - a fork without a box at the screed;
23 - studs without a box at the screed on one side;
24 - studs without a box at the screed from different sides;
25 - flexible terminal at the screed on one side;
26 - flexible outlet at the screed from different sides;
27 - flexible terminal at the screed along the axis in thickness from different sides;
28 - terminal block on a strip with axial extension;
29 - terminal block on the box;
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