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Platinum gold channel electric-heating design method

A design method and platinum channel technology, applied in ohmic resistance heating, electric heating devices, electrical components, etc., can solve the problems of small conduction angle of thyristor, large harmonic pollution, waste of equipment, etc.

Active Publication Date: 2009-01-07
IRICO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Again, the power design value is several times larger, resulting in waste of equipment, and at this time the conduction angle of the thyristor is too small, the harmonic pollution is too large, and the control accuracy cannot meet the process requirements

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0034] For a platinum channel made of PtRh40Ru10Ir7Au5%, if it is from 0°C to 2000°C, the temperature coefficient of resistance α=1.3×10 -3 (℃ -1 ), working temperature T=1450°C, resistivity ρ(0°C)=76μΩ·cm, cross-sectional area S=1000mm 2 , length L(Pt)=800mm, current density J=12A / mm at working temperature 2 , copper bar length L (Cu) = 12m. According to the above conditions, the following calculation can be carried out:

[0035] Resistivity ρ(1450℃)=76×10 at working temperature -6 ×(1+1.3×10 -3 ×1450)

[0036] =219×10 -6 Ω·cm

[0037] Resistance R at operating temperature 铂金 =219×10 -6 ×800×10 -3 / 1000×10 -6

[0038] =1.75×10 -3 Ω

[0039] The current density J at working temperature is 2.2A / mm 2

[0040] Maximum current I at operating temperature 最大 =1000×2.2=2200A

[0041] The maximum working voltage U of this section 最大 =2200×1.75×10 -3 =3.85V

[0042] The maximum platinum electric heating power P in this sec...

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Abstract

The present invention provides a platinum passage electric heating design method. A platinum passage area is the area where the froth eliminating, the equalization, the mixing, and the temperature regulating are effected during the producing process of the liquid crystal display panel glass. In order to realize the special technical curve required by the liquid crystal display panel glass, the specific heat-preservation and electric-heating design is required. The present invention can rationally configure the electric equipment, and can realize the technical requirement of the high precision and temperature control under the preconditions of pointing to the platinum system noble metal alloy in the room temperature to 1600 DEG C, using the power modulator and the transformer used for electric heating to set the heating electrical property (including: voltage, current, power) according to various external conditions, conducting necessary correction by formulas when the condition of precise calculation is satisfied, and prolonging the service life of the platinum passage maximally.

Description

technical field [0001] The invention relates to an electric heating design method, in particular to a platinum channel electric heating design method. Background technique [0002] Liquid crystal display panel glass is a flat panel display device consisting of a flat glass substrate or glass plate. The overflow method is the preferred method for manufacturing glass sheets used in liquid crystal display panel glass. Because the glass plate produced by the overflow method has excellent flatness and smoothness on the surface compared with the flat plate prepared by other methods. The melting process is described in detail in US Patents 3,338,696 and 3,682,609. Many glasses used in flat panel display manufacturing, especially those formed using the overflow method, are homogenized, stirred and tempered using refractory metal components, such as platinum or alloys composed of platinum-containing metals. At this time, refractory metals are used to minimize the compositional inh...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02F1/1333H05B3/00C03B17/06
CPCC03B5/1675
Inventor 韩俊宋金虎
Owner IRICO