CN209345421U - Generate heat tubing and electric heater - Google Patents

Abstract

The utility model relates to electric heater technical fields, especially disclose a kind of fever tubing, including encapsulate tube body and be threaded through the intracorporal heat-generating wires of package tube, and the encapsulation tube body includes copper pipe and the graphene film for being coated on copper pipe surface.Preferably, graphene film is to be formed by graphene powdered carbon with the outer surface that plasma spray coating process sprays to the copper pipe, with a thickness of 1.0~2 μm, preferably 1.5 μm.Through surveying, the encapsulation tube body of the fever tubing of the utility model, thermal coefficient is 105.15% times of pure copper tube.The utility model also provides a kind of electric heater using the fever tubing.The fuel factor of electric heater can be obviously improved using the fever tubing.

Description

Generate heat tubing and electric heater

Technical field

The utility model relates to small household appliances technical field more particularly to a kind of fever tubing and electric heater.

Background technique

Existing winter electric heater mostly uses iron-nickel alloy wire as heater element, and surface temperature reaches 1400 DEG C. As shown in Figure 1, needing to use the fever tubing of iron-nickel alloy wire production when manufacturing electric heater.To prevent iron nickel wire from generating heat When aoxidize, solve the problems, such as the service life for insulating and extending iron-nickel alloy wire, be to wear iron-nickel alloy wire 1 on general technology Among closed stainless steel tube 2, insulation processing is carried out with magnesia powder 3 again in stainless steel tube.Since stainless steel tube 2 has It is corrosion-resistant, it is not oxidizable, therefore be a kind of fever tubing most generally used at present.But the thermal coefficient of stainless steel material Only 16.2W/m.K, its thermal coefficient are very low, and the radiating efficiency for the fever tubing for causing stainless steel tube 2 to encapsulate is very low, significantly Reduce heating effect and efficiency of heating- utilization.

Therefore, it is necessary to propose to improve to existing heat-generating pipe.

Utility model content

(1) technical problems to be solved

In order to solve the above problem of the prior art, the utility model provides a kind of new fever tubing, existing to replace The fever tubing of some stainless steel tube encapsulation increases fuel factor to improve the thermal coefficient and radiating efficiency of fever tubing.This Utility model also provides the electric heater with the fever tubing.

(2) technical solution

In order to achieve the above object, the main technical schemes of the utility model use include:

The utility model provides a kind of fever tubing comprising encapsulates tube body and is threaded through the intracorporal fever of the package tube Wire, wherein the encapsulation tube body includes copper pipe and the graphene film for being coated on copper pipe surface.

Preferably, the heat-generating wires are iron-nickel alloy wire.

Preferably, the magnesia powder of insulating effect has been filled between the heat-generating wires and the inner wall of the copper pipe.

Preferably, the surface refers to inner surface or the outer surface of copper pipe.

Preferably, the graphene film is the appearance for spraying to the copper pipe with plasma spray coating process by graphene powdered carbon Face is formed.

Preferably, the graphene film with a thickness of 1.0~2 μm, preferably 1.5 μm.

Preferably, the wall thickness uniform throughout of the copper pipe is consistent, and the thickness uniform throughout of the graphene film is consistent.It is logical Crossing makes the identical copper pipe thickness in each position of the heat conducting pipe and graphene film thickness, and it is uniform thermally conductive to obtain thermal coefficient Pipe, to meet actual production and living needs.

Preferably, the wall thickness of the copper pipe is thickens from the first end of copper pipe to second end gradual change type, and the graphene The first end of the thickness of film from the copper pipe is thinning to second end gradual change type, makes the uniform external diameter one at encapsulation each position of tube body It causes.By the copper pipe thickness and graphene film thickness accounting for keeping each position of the heat conducting pipe different, obtains different heat conducting pipes and lead Hot coefficient, and change thermal coefficient in gradual change type, to meet actual production and living needs.

Preferably, the thickness of the copper pipe and graphene film with a thickness of 10~3000:1；Copper pipe with a thickness of 20 μm~ 6mm, preferably 3mm.

A kind of electric heater of the utility model, it includes the fever tubing of any of the above-described embodiment.

(3) beneficial effect

The beneficial effects of the utility model are:

The thermal coefficient of copper is 401W/m.K, using copper pipe as thermally conductive tube material, can greatly promote fever tubing Fuel factor.The thermal coefficient of graphene is 5000W/m.K, is the highest Heat Conduction Material of Institute of Science identification so far.But stone Black alkene is at high cost, expensive, seems not economical enough by graphene production Heat Conduction Material completely.Therefore, the utility model selects Graphene film is coated to the surface of copper pipe, a kind of novel heat conducting pipe is made.When copper pipe thickness 3mm, the thickness of graphene film When being 1.5 μm, the heat conducting pipe thermal coefficient for measuring the utility model is 418.5W/ (mK), improves about 5.15% compared with fine copper, It is a kind of heat conducting pipe haveing excellent performance.

Using the tubing that generates heat made of the heat conducting pipe and iron-nickel alloy wire, heat up (25 DEG C of environment temperature) speed in 2min It is 2.3 times of existing electric heater (the fever tubing of stainless steel encapsulation).Therefore, the utility model provides one kind and has excellent performance Fever tubing, can really be obviously improved the fuel factor of electric heater.

Detailed description of the invention

Fig. 1 is the fever tubing structural schematic diagram of existing electric heater.

Fig. 2 is the fever tubing structural schematic diagram of the electric heater of the utility model preferred embodiment.

[description of symbols]

1- iron-nickel alloy wire；2- stainless steel tube；3- magnesia powder；100- fever tubing；10- iron-nickel alloy wire；20- is thermally conductive Pipe；21- copper pipe；22- graphene film；30- magnesia powder.

Specific embodiment

It is with reference to the accompanying drawing, right by specific embodiment in order to understand in order to preferably explain the utility model The utility model is described in detail.

As shown in Fig. 2, being a kind of fever tubing 100 of the utility model preferred embodiment, for manufacturing the hair of electric heater Heat pipe.Fever tubing 100 includes metal heating resistance wire, the heat conducting pipe 20 being encapsulated in outside the metal heating wire (to prevent gold Belong to heating resistance wire to be oxidized), the insulating materials being filled between package tube and metal heating resistance wire.In the utility model In preferred embodiment, fever tubing 100 is made of iron-nickel alloy wire 10, heat conducting pipe 20 and magnesia powder 30.Wherein heat conducting pipe 20 play protection iron-nickel alloy wire 10, prevent iron-nickel alloy wire 10 from being aoxidized at high temperature by the oxygen in environment, heat conducting pipe 20 For enclosed environment, prevent air from entering.Magnesia powder 30 have insulation and fire retardation, prevent iron-nickel alloy wire 10 with it is thermally conductive It is conductive between pipe 20.Heat conducting pipe 20 includes copper pipe 21 and the composition of graphene film 22 for being covered on 21 surface of copper pipe.Wherein, graphene Film 22 with a thickness of 1.0~2 μm, preferably 1.5 μm.

Further, the wall thickness uniform throughout of copper pipe 21 is consistent, and the thickness uniform throughout of graphene film 22 is consistent；Or The wall thickness of copper pipe 21 is to thicken from the first end of copper pipe 21 to second end gradual change type, and the thickness of graphene film 22 is from copper pipe 21 First end is thinning to second end gradual change type, keeps the uniform external diameter at each position of heat conducting pipe 20 consistent.It is highly preferred that the thickness of copper pipe 21 With graphene film 22 with a thickness of 10~3000:1, copper pipe 21 is with a thickness of 20 μm~6mm, preferably 3mm.

The thermal coefficient of copper is 401W/m.K, using copper pipe 21 as Heat Conduction Material, can greatly promote fever tubing 100 Heating conduction makes the thermal efficiency of electric heater be greatly improved.The thermal coefficient of graphene is 5000W/m.K, is so far The highest Heat Conduction Material of Institute of Science identification.But graphene is other than with very high heating conduction, and surface strength is also very It is uneconomical to be fabricated separately seeming for Heat Conduction Material with graphene entirely, will lead to correlation for height, and graphene preparation cost is very high at present Product price it is more expensive.For this purpose, the utility model combines graphene with copper, makes a kind of surface and combine graphene film Copper pipe heat conducting pipe 20.

Wherein, graphene film 22 both can be in conjunction with the inner surface in copper pipe 21, can also be in conjunction in the outer surface of copper pipe 21. But surface is more difficult in view of being incorporated in actual production, and the heat conducting pipe 20 of the utility model is primarily to protect iron nickel The factors such as alloy wire 10, starvation, chemical attack, humidity, and in copper pipe 21 it is enclosed environment, oxidation and likelihood of corrosion are very It is small.It is therefore preferred that graphene film 22 to be covered on to the outer surface of copper pipe 21, protection can also be formed to copper pipe 21 in this way and made With.

During actual fabrication heat conducting pipe 20, since graphene is difficult to be attached on other objects and dissolves Property it is very poor, if the mode for being fabricated to graphene slurry be coated on copper pipe 21 will lead to it is low with the bonding tightness of copper pipe 21, apply Cloth is uneven, then can also leave many stomatas after the volatilization of dry and solvent.Therefore, in the present invention, it is preferred to use etc. Graphene powder is sprayed to the outer surface of copper pipe 21 by plasma spray technique, forms the graphene film 22.Plasma spraying work Skill has many advantages, such as that film is tightly combined, is not easily to fall off, film forming even compact, film thickness are easy to accurately control.

Specifically, plasma spray coating process includes: using plasma-spraying device, and after powered up, working gas is filled Point ionization forms plasma flame, reduces jet size so that plasma by generated when narrow aperture huge grade from Sub- jet stream, the graphene powder rapid melting and high fast direction copper pipe 21 that powder feeder is sent into, forms in 21 surface solidification of copper pipe A kind of heat conducting pipe 20 of lower-cost high thermal conductivity is made in graphene film 22.Wherein, graphene film 22 can both increase copper pipe 21 surface strength, while the thermal coefficient of the copper pipe 21 greatly increased again.

The principle of plasma spraying processing is: generating high speed plasma torch using spray gun, while powder feeder will be to be sprayed Powder (graphene powder) be sent into plasma torch stream in be accelerated, fusing, be finally sprayed-on and be solidified in coating surface to be painted.Deng Ionomer spray equipment is made of cathode, nozzle, powder feeder, water-cooling system, gun body and insulator etc..

Through measuring, when the graphene film by plasma spray coating process at 1.5 μm of the formation of 21 surface of copper pipe of wall thickness 3mm When 22, measuring thermal conductivity coefficient is 418.5W/ (mK), and the copper pipe of more uncoated graphene film promotes about 5.15%.Therefore, this reality A kind of heat conducting pipe 20 haveing excellent performance is provided with novel.

In addition, a kind of electric heater of the utility model, it includes the fever tubing 100 of any of the above-described embodiment.Preferably, Graphene film 22 with a thickness of 1.5 μm on the fever tubing 100.Make through actual test when heat conducting pipe caliber is identical with thickness With the fever tubing 100 of the utility model in 2 minutes, heat up 52K (25 DEG C of environment temperature), and common stainless steel The fever tubing of encapsulation heats up 23K, heating rate the former be more than 2.3 times of the latter.Therefore, the utility model provides a kind of property The excellent fever tubing 100 of energy, can be obviously improved the fuel factor of electric heater.

Claims (7)

1. a kind of fever tubing, including encapsulate tube body and be threaded through the intracorporal heat-generating wires of the package tube, which is characterized in that The encapsulation tube body includes copper pipe and the graphene film for being coated on copper pipe surface.

2. fever tubing according to claim 1, which is characterized in that the heat-generating wires are iron-nickel alloy wire.

3. fever tubing according to claim 1 or 2, which is characterized in that the heat-generating wires are interior with the copper pipe The magnesia powder of insulating effect has been filled between wall.

4. fever tubing according to claim 2, which is characterized in that the graphene film be by graphene powdered carbon with it is equal from The outer surface that sub- spraying process sprays to the copper pipe is formed.

5. fever tubing according to claim 2, which is characterized in that the graphene film with a thickness of 1.0~2 μm.

6. fever tubing according to claim 5, which is characterized in that the wall thickness uniform throughout of the copper pipe is consistent, and institute The thickness uniform throughout for stating graphene film is consistent；Or the wall thickness of the copper pipe is from the first end of copper pipe to second end gradual change type It thickens, and the first end of the thickness of the graphene film from the copper pipe is thinning to second end gradual change type, makes the encapsulation tube body The uniform external diameter at each position is consistent.

7. a kind of electric heater, it includes the described in any item fever tubing of claim 1~6.