CN102905409A - Insulated magnesium oxide heating coil - Google Patents
Insulated magnesium oxide heating coil Download PDFInfo
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- CN102905409A CN102905409A CN 201210382242 CN201210382242A CN102905409A CN 102905409 A CN102905409 A CN 102905409A CN 201210382242 CN201210382242 CN 201210382242 CN 201210382242 A CN201210382242 A CN 201210382242A CN 102905409 A CN102905409 A CN 102905409A
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- magnesium oxide
- heating coil
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- heating
- heater
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Abstract
The invention discloses an insulated magnesium oxide heating coil which comprises a metal shell, wherein resistance wires spirally arranged are arranged inside the metal shell, and a magnesium oxide insulating layer is arranged between resistance wires and the metal shell. The insulated magnesium oxide heating coil has the advantages that the insulated magnesium oxide heating coil is suitable for various heating systems of plastics, chemical industries and food machinery; high-purity magnesium oxide of which a heat-conducting property is higher than those of traditional mica and ceramic is adopted as an insulated material; and heat of heating wires can be quickly transferred to a heated object, therefore, temperatures of the heating wires are reduced; service life of the heating coil is greatly improved; the insulated magnesium oxide heating coil is of a full-sealed structure, and can resist pollution; power density achieves 15W/cm<2>, and a use temperature can achieve 760 DEG C.
Description
Technical field
The present invention relates to a kind of heater, relate in particular to a kind of magnesium oxide insulated heating collar.
Background technology
Electric heater is the indispensable heater elements of industry such as plastics, rubber, chemical fibre; in the practice of industrial electro heater, the slight phenomenon out of control of temperature usually can appear, when heating-up temperature arranges when on the low side; raw material can not normally melt, and production can not normally be carried out.When heating-up temperature arranges normally, raw material melts when normal, although heater has stopped work by thermostat, but the remaining temperature of electric heater and the remaining temperature of heated object screw rod still continue raw material in the body is heated, the producer can not control effectively and timely to heating-up temperature, thereby cause the interior raw material of heated object by superheated, product quality is affected.Multiple heater configuration is provided in the market.If consider heater from the insulation viewpoint, the plastic processing industry is used the common heater of three classes: mica, pottery and metal casting heater.
One, mica heater: mica mainly extracts from Paleozoic rocks, and a lot of places can both be found in the world, comprising India, South Africa, Russia and American continent.Many electric equipments use mica, for example, bread baker, microwave oven, ring heater and flake heater, micatization studies subpackage and contains silica, belongs to aluminosilicate-type.The insulating material that uses in the mica heater has remarkable physical features, such as hot property, mechanical performance, electric property and chemical property.Mica mainly contains two classes.The first kind is muscovite, and it contains a large amount of potassium, has very strong mechanical performance; Equations of The Second Kind is phlogopite, and different phlogopite contain the magnesium of varying number, and it more can tolerate high temperature than muscovite.The specific characteristic that mica has is that it can provide again as thin as a wafer mica sheet of consistency of thickness.Mica heat conductivility extreme difference, in the direction perpendicular to its rock stratum, these characteristics are especially obvious.In addition, mica nonflammable, fire-resistant, do not smolder.Because that mica has is corrosion-resistant, resist and to wear performance and dielectric strength, it is the reliable selection of heater.In addition, it is waterproof that mica can tolerate the chemicals burn into, and have remarkable compressive resistance.Because mica has very strong elasticity, it is ability stress by bending also.Surpass 1000 ℃ temperature although some mica type can tolerate, when being used for heater assembly, the mica temperature should be above 550 ℃.When temperature surpasses this level, adhesive just begins to degenerate, and dielectric strength also will die down.These features are very important because in order to form special diameter, need to be under the pressure at right angle effect crooked mica ring heater.The about thick 5mm of common mica heating collar can adapt to multiple geometry and particular component, such as hole and groove.The design of mica ring heater is multi-functional, is applicable to various application occasions and market.The weakness of mica ring heater maximum is that its tolerant sheath temperature can not be above 450 ℃.And the power density of mica heater can only reach 3W/cm
2At present, the requirement of more and more plastic processs can provide above the mica heater.
Two, ceramic heater: pottery, mainly salic (Al2O3), silica (SiO2) and magnesium oxide (MgO).These raw materials are mixed in appropriate ratio, then under the characteristics temperature, fire and form.Pottery joint heater can be processed 760 ℃ temperature.This performance is the direct result of the remarkable insulation property of heater pottery articular portion.These joint synergies (being similar to the ball-and-socket joint of knee or ancon) form heater diameter.Regrettably, the advantage of pottery also is its weakness, because the heat that its energy memory element wire produces, so people are difficult to the temperature of control ceramic heater.This can cause unnecessary waste material, and in the early stage of plastic production technology, this point is especially outstanding.In addition, ceramic heater damages in disassembly process easily, and after particularly heating up, it is more open that heater can become, and makes troubles to installation.Ceramic heater can not be subject to polluting the range of application that this characteristic has also been placed restrictions on this class heater.
Three, metal casting heater: be that heating tube with definite shape casts in the materials such as copper, aluminium or iron, this class heater volume is larger, cost of manufacture is high, energy consumption is high in the production process, environment there is pollution, and the heat efficiency is lower when using, abroad less this type of heater of employing (unless particular requirement).
Summary of the invention
Technical problem to be solved by this invention is: the magnesium oxide insulated heating collar that a kind of long service life is provided.
In order to solve the problems of the technologies described above, the technical solution used in the present invention is: the magnesium oxide insulated heating collar, comprise: metal shell, in described metal shell, be arranged at spiral-distributed resistance wire, between resistance wire and metal shell, be provided with the magnesium oxide insulated layer.
Advantage of the present invention is: above-mentioned magnesium oxide insulated heating collar, be applicable to the heating system of all types of plastic, chemical industry and food machinery, adopt heat conductivility than the higher high-purity magnesium oxide of traditional mica, pottery as insulating material, the heat of heating wire can pass to rapidly heating object, reduced the temperature of heating wire, greatly improved the useful life of heating collar, the totally-enclosed structure, antipollution, power density reaches 15W/cm
2, serviceability temperature can reach 760 ℃.
Description of drawings
Fig. 1 is the structural representation of magnesium oxide insulated heating collar of the present invention.
Among the figure: 1, metal shell, 2, resistance wire, 3, the magnesium oxide insulated layer.
Embodiment
Describe particular content of the present invention in detail below in conjunction with the drawings and specific embodiments.
As shown in Figure 1, the magnesium oxide insulated heating collar comprises: metal shell 1, in described metal shell 1, be arranged at spiral-distributed resistance wire 2, and between resistance wire 2 and metal shell 1, be provided with magnesium oxide insulated layer 3.
During concrete the manufacturing, metal shell 1 can adopt stainless steel, aluminium, copper coin or copper pipe to make, and metal shell 1 has very strong structural capacity, is convenient to dismounting; Resistance wire 2 can adopt: the Ni80Cr20 alloy resistance wire; Magnesium oxide insulated layer 3 has remarkable heat conductivility and dielectric strength.
Above-mentioned magnesium oxide insulated heating collar, be applicable to the heating system of all types of plastic, chemical industry and food machinery, adopt heat conductivility than the higher high-purity magnesium oxide of traditional mica, pottery as insulating material, the heat of heating wire can pass to rapidly heating object, reduced the temperature of heating wire, greatly improved the useful life of heating collar, the totally-enclosed structure, antipollution, power density reaches 15W/cm
2, serviceability temperature can reach 760 ℃.
Claims (1)
1. magnesium oxide insulated heating collar, comprise: metal shell (1), it is characterized in that: in described metal shell (1), be arranged at spiral-distributed resistance wire (2), between resistance wire (2) and metal shell (1), be provided with magnesium oxide insulated layer (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210382242 CN102905409A (en) | 2012-10-10 | 2012-10-10 | Insulated magnesium oxide heating coil |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201210382242 CN102905409A (en) | 2012-10-10 | 2012-10-10 | Insulated magnesium oxide heating coil |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102905409A true CN102905409A (en) | 2013-01-30 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201210382242 Pending CN102905409A (en) | 2012-10-10 | 2012-10-10 | Insulated magnesium oxide heating coil |
Country Status (1)
| Country | Link |
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| CN (1) | CN102905409A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107087317A (en) * | 2017-05-04 | 2017-08-22 | 常熟黑石电热科技有限公司 | Magnesium oxide insulated heater |
-
2012
- 2012-10-10 CN CN 201210382242 patent/CN102905409A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107087317A (en) * | 2017-05-04 | 2017-08-22 | 常熟黑石电热科技有限公司 | Magnesium oxide insulated heater |
| CN107087317B (en) * | 2017-05-04 | 2023-03-10 | 常熟黑石电热科技有限公司 | Magnesium oxide insulating heater |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20130130 |