CN2145488Y

CN2145488Y - Vertical-belt heating radiation pipe

Info

Publication number: CN2145488Y
Application number: CN 92243117
Authority: CN
Inventors: 宁效启; 陈庆宏
Original assignee: No4 Design Academy Ministry Of Machine-Building And Electronics Industry
Current assignee: No4 Design Academy Ministry Of Machine-Building And Electronics Industry
Priority date: 1992-11-27
Filing date: 1992-11-27
Publication date: 1993-11-03
Anticipated expiration: 2002-11-27

Abstract

The utility model relates to a vertical-belt heating radiation pipe, which can be used for the supply heat of the controlled-atmosphere furnace or other grates which requires the indirect resistance heating. The utility model comprises a heat resistant steel casing, an insulating board, a pi-shaped resistor belt, and a ceramic frame. An end is provided with a protecting cover, and the ceramic frame comprises porcelains, such as partition boards, sleeve pipes, baffle plates, etc. The utility model is fixed to form into the proper form via two guiding rods. The partition board of the frame is provided with rectangle slotted holes which have equal horizontal spacing and the number of the spacing is odd. The protecting cover of the end is in the shape of the cup, and the cover is provided with a slotted hole.

Description

Vertical-belt heating radiation pipe

The utility model relates to a kind of electrothermal radiation tube, is used for controlled atmosphere generator or other stove heat supplies that requires indirect resistance to heat.

Existing electrothermal radiation tube has several patterns:

A kind of is helix core minor electrothermal radiation tube (see figure 4), and its electric heating element is to be looped around on the porcelain tube with resistance wire, and structure is simpler.Its weak point is that the electric heating element surface loading is higher, the life-span is short, the surperficial power of radiant tube is low.

A kind of belt or banded its resistive band of setback formula electrothermal radiation tube are radial arrangement (see figure 5) in radiant tube, make the electric heating element cross section bigger.Its weak point is to use transformer, has improved operating cost; The resistive band that has is horizontal partially placement, at high temperature is easy to generate deflection because of the deadweight effect.

Another kind of squirrel-cage or thread setback formula electrothermal radiation tube (see figure 6), element are diameter greater than 6 millimeters resistor rod, and its weak point is because section is thick, the garden cylindrical outer surface is long-pending little, thereby the element surface load is increased, and useful life is shorter.

A kind of electrothermal radiation tube (see figure 7) that woods company of association makes is liked by Germany, and its resistive band is upright on porcelain tube, can make radiant tube surface power improve 50%, and surface loading reduces by 50～80%, thereby the life-span is improved.Its weak point is that the resistive band flakiness ratio can not be greater than 15:1, and material can only select for use elongation greater than 25% nichrome alloy belt, and section changes after the coiling, and rebound phenomenon is arranged, and difficulty is installed, and percent defective is higher.

The purpose of this utility model is to overcome above-mentioned the deficiencies in the prior art part and provides a kind of reduction element surface load, raising radiant tube surface power, manufacturing, installation to be easy to electrothermal radiation tube.

The utility model is realized by following measure:

Electrothermal radiation tube is made up of heat resisting steel housing, heat-insulating shield, the some resistive bands that are bent into the ∏ type, ceramic framework.The pottery framework comprises the porcelain spares such as dividing plate, sleeve pipe and baffle plate of band rectangle slotted eye, and is fixed-type with two eduction rods.The effect of pottery framework is the supporting resistive band, makes it unsettled layout to weaken mutual shielding action and to prevent to be short-circuited between the resistive band.The square type slotted eye (the slot pitch number is an odd number) that has some level intervals to equate on the dividing plate, resistive band just is inserted in these slotted eyes, is furnished with like this to be beneficial to the heat supply of reinforcement to side surface of workpiece, weakens distortion.The use of sleeve pipe is the distance that keeps between dividing plate, and resistive band and eduction rod are separated, to weaken the radiation effects of resistive band to eduction rod.

Resistive band is free wxpansion along its length, and when preventing to expand and the body contact short circuit, pipe end is equipped with ceramic protective cover.Protective cover is cup-shaped, has covered slotted hole.

Fig. 1 is the utility model structure chart, Fig. 2 is a ∏ type resistive band structure chart, Fig. 3 is diaphragm structure figure, Fig. 4 is a helix core minor electrothermal radiation tube, Fig. 5 is belt or banded setback formula electrothermal radiation tube, Fig. 6 is squirrel-cage or thread setback formula electrothermal radiation tube, and Fig. 7 is that the electrothermal radiation tube that woods company of association makes is liked by Germany.

As shown in the figure: eduction rod (1), heat resisting steel housing (2), heat-insulating shield (3), dividing plate (4), sleeve pipe (5), ∏ type resistive band (6), protective cover (7), baffle plate (8), rectangle slotted eye (9).

Below in conjunction with Fig. 1, Fig. 2, Fig. 3 performance of the present utility model is described.

Electrothermal radiation tube is made up of heat resisting steel housing (2), heat-insulating shield (3), ∏ type resistive band (6) and ceramic framework.The pottery framework comprises that dividing plate (4), sleeve pipe (5) and baffle plate porcelain spares such as (8) are fixed-type with two eduction rods (1).The rectangle slotted eye (9) that has some level intervals to equate on the dividing plate (4), ∏ type resistive band (6) just is inserted in these slotted eyes.

The electric radiation pipe end is equipped with protective cover (7), and protective cover is cup-shaped, has covered slotted hole.

The utility model compared with prior art has the following advantages:

Unsettled, the equidistant layout of 1 resistive band has weakened mutual radiation effects, has strengthened the heat supply to side surface of workpiece, and can prevent from being short-circuited between the resistive band.

2 resistive band effective lengths, flakiness ratio increase, solid and reduced the surface loading of heating, improved the surperficial power of radiant tube, prolonged service life.

3 processing and manufacturings, installation, maintenance are conveniently.

4 pairs of materials require low.

Claims

1, a kind of vertical-belt electrothermal radiation tube is characterized in that being made up of heat resisting steel housing, heat-insulating shield, Π type resistive band and ceramic framework, and protective cover is equipped with in the termination.

2, according to claim 1, described vertical-belt electrothermal radiation tube is characterized in that ceramic framework comprises porcelain spares such as dividing plate, sleeve pipe and baffle plate, and is fixed-type with two eduction rods.

3, according to claim 1, described vertical-belt electrothermal radiation tube is characterized in that having on the dividing plate some rectangle slotted eyes, and the slotted eye level interval equates that the spacing number is an odd number.

4, vertical-belt electrothermal radiation tube according to claim 1 is characterized in that protective cover is cup-shaped, has covered slotted hole.