CN214413061U - Gas electric heater capable of heating at high temperature - Google Patents

Abstract

The utility model relates to a but gas electric heater of high temperature heating, including runner coil pipe, heating pipe group and heat conduction metal, wherein, the heating pipe group nestification is in the inside of runner coil pipe, and runner coil pipe and heating pipe group form wholly through the casting of heat conduction metal together for the heat that heating pipe group produced can pass to the runner coil pipe through heat conduction metal on, thereby the torrent treat heating gas in the heating runner coil pipe. According to the utility model discloses a but gas electric heater of high temperature heating, runner coil pipe and heating pipe group form wholly through heat conduction metal casting together, have compact structure, small, heating efficiency is high, can be used to characteristics such as high temperature heating.

Description

Gas electric heater capable of heating at high temperature

Technical Field

The utility model relates to an electric heating intensifies, but more specifically relates to a but gas electric heater of high temperature heating.

Background

Most of existing gas electric heaters are gas heat conduction, namely heating resistance wires are used for heating gas near the wall surface of a heating pipe group and then conducting heat to the whole gas to be heated. For example, CN201710557889.7 and CN201120470037.2 disclose the structure of a conventional gas electric heater, as shown in fig. 3, a gas to be heated flows into a flow section 12 'in a housing 1' from a gas inlet 11 ', and then flows out from a gas outlet 13', and the gas to be heated flows smoothly in the flow section 12 'to be heated in direct contact with a heating tube group 2'. Obviously, due to the reasons of low gas thermal conductivity, high flow rate, straight pipe flow channel and the like, the gas at a position far away from the heating tube group 2' can only be heated through gas heat conduction, and the heating effect is poor, so that the problems of large volume, low heating efficiency and the like of the gas electric heater are caused. In addition, in order to ensure that the electric heater reaches the specified temperature in the high-temperature heating occasions, great heating power is needed, and inconvenience is caused in some occasions with low power supply.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems of large volume and low heating efficiency of the gas electric heater in the prior art, the utility model provides a gas electric heater capable of heating at high temperature.

According to the utility model discloses a but gas electric heater of high temperature heating, it includes runner coil pipe, heating pipe group and heat conduction metal, and wherein, the heating pipe group nestification is in the inside of runner coil pipe, and runner coil pipe and heating pipe group form wholly through the casting of heat conduction metal together for the heat that heating pipe group produced can pass to the runner coil pipe through heat conduction metal on, thereby the torrent treats heating gas in the heating runner coil pipe.

Preferably, the gas electric heater further comprises an insulating layer wrapping the outer side of the heat conducting metal and a shell wrapping the outer side of the insulating layer.

Preferably, the gas electric heater further comprises an explosion-proof junction box connected with the heating tube set.

Preferably, the heating banks extend from the insulation and the housing and have a non-heating section.

Preferably, the heating tube stack is sealed by epoxy resin at a position of the non-heating section adjacent to the explosion-proof junction box.

Preferably, the runner coil is formed by bending a whole piece of high nickel alloy stainless steel pipe.

Preferably, the heating pipe group comprises two U-shaped heating pipes which are arranged perpendicular to each other.

Preferably, the thermally conductive metal is copper.

Preferably, the gas electric heater further comprises a first temperature sensing element disposed at an inlet location of the runner coil and a second temperature sensing element disposed at an outlet location of the runner coil.

According to the utility model discloses a but gas electric heater of high temperature heating, runner coil pipe and heating pipe group form wholly through the heat conduction metal casting together to make the heat that heating pipe group produced can pass to the runner coil pipe rapidly evenly through the heat conduction metal on, the gas that waits to heat flows in the runner coil pipe, because the runner is the coil pipe, can produce the disturbance when gas circulates in it, make the heat can be in gas misce bene, compact structure has, small, heating efficiency is high, can be used characteristics such as high temperature heating.

Drawings

Fig. 1 is a schematic structural view of a high-temperature heatable gas electric heater according to a preferred embodiment of the present invention;

FIG. 2 is an enlarged view of a portion of FIG. 1;

fig. 3 is a schematic structural view of a conventional gas electric heater.

Detailed Description

The following description of the preferred embodiments of the present invention will be made with reference to the accompanying drawings.

As shown in fig. 1, the gas electric heater capable of heating at high temperature according to the present invention includes a flow path coil 1, a heating pipe group 2 and a heat conductive metal 3, wherein the flow path coil 1 and the heating pipe group 2 are cast together by the heat conductive metal 3 to form a whole, so that the heat generated by the heating pipe group 2 can be rapidly and uniformly transferred to the flow path coil 1 through the heat conductive metal 3, thereby heating the gas to be heated having turbulent flow in the flow path coil 1. In particular, the heat resistance of the material of the heating bank 2 is higher than that of the material of the flow path coil 1, and the heat resistance of the material of the flow path coil 1 is higher than that of the heat conductive metal 3. In the present embodiment, the heat conductive metal 3 is copper. It should be understood that for example aluminum, which is slightly less thermally conductive, may also be used in the present invention.

The runner coil 1 is formed by bending a whole high-nickel alloy stainless steel pipe, the radius of the bent pipe, the diameter of the pipe and the number of bending turns are determined by the power of gas to be heated and a gas electric heater, and the radius, the diameter and the number of bending turns can be calculated by a known method. The arrangement of the runner coil 1 can increase the heat absorption capacity of the gas to be heated in the gas electric heater, and meanwhile, the gas to be heated is ensured to flow in a specified pipeline and not to be in direct contact with the heating pipe group 2, so that the risk possibly caused by the cracking of the heating pipe group 2 is reduced. In this embodiment, the material of the flow field coil 1 is inconel 625.

The heating pipe set 2 is nested in the runner coil pipe 1 and is formed by combining a plurality of groups of heating pipes. In the present embodiment, the heating tube set 2 includes two U-shaped heating tubes disposed perpendicular to each other. The heating pipe is formed by filling an electric heating wire in a seamless metal pipe, and shrinking a pipe after filling magnesium oxide powder with good heat conductivity and insulativity in a gap part. In this embodiment, the material of the heating tube is Incoloy800, and the heating wire is a nichrome wire.

As shown in fig. 1, the gas electric heater capable of heating at high temperature according to the present embodiment further includes an insulating layer 4 tightly wrapped on the outer side of the heat conductive metal 3 to ensure that heat is not dissipated in the air. In this embodiment, the material of the insulating layer 4 is alumina fiber. It should be understood that the material of the insulating layer 4 can be glass fiber, ceramic fiber, etc.

As shown in fig. 1, the gas electric heater capable of high-temperature heating according to the present embodiment further includes a case 5 coated outside the insulating layer 4 to shape and fix the insulating layer 4. In the present embodiment, the material of the housing 5 is cast iron.

As shown in fig. 1, the gas electric heater capable of heating at high temperature according to the present embodiment further includes an explosion-proof junction box 6 connected to the heating tube assembly 2, in which a lead wire for connecting an electric wire is provided, and a power supply supplies power to the heating wires in the heating tube assembly 2 through the lead wire when in use. It should be understood that the explosion-proof junction box 6 can be designed according to the requirements of the environment, and meets the requirements of different explosion-proof grades.

Specifically, the heating bank 2 of the high temperature-heatable gas electric heater according to the present embodiment protrudes from the insulating layer 4 and the housing 5 and has a non-heating section 21, as shown in fig. 1, with an epoxy resin 22 at a position of the non-heating section 21 adjacent to the explosion-proof junction box 6, as shown in fig. 2. This is because if the magnesium oxide powder in the heating tube of the heating tube group 2 is exposed to the air, it is very easy to absorb moisture and carbon dioxide and gradually becomes basic magnesium carbonate, and the insulation performance is lost, and therefore, it is necessary to seal by the epoxy resin 22, and considering that the epoxy resin is not resistant to high temperature, the epoxy resin 22 is disposed at a position adjacent to the explosion-proof terminal box 6 in the non-heating section 21.

As shown in fig. 1, the gas electric heater capable of heating at high temperature according to the present embodiment further includes a first temperature measuring element 7 and a second temperature measuring element 8, wherein the first temperature measuring element 7 is disposed at an inlet position 11 of the runner coil 1 to detect an inlet temperature of the gas electric heater, and the second temperature measuring element 8 is disposed at an outlet position 12 of the runner coil 1 to detect an outlet temperature of the gas electric heater.

The following describes a method of manufacturing the gas electric heater which can be heated at a high temperature according to the present embodiment. Firstly, the runner coil 1 is coiled according to a certain radius and turns as required, and the heating tube group 2 is extended to the inner side of the runner coil 1 and fixed in position. Then, a casting mold (for example, a copper casting mold) is manufactured, and the runner coil 1 and the heating tube group 2 are inserted into the mold. Next, the power supply in the explosion-proof junction box 6 is turned on, and the heating tube set 2 is heated up, and the temperature is controlled to be lower than the melting point of the runner coil 1 but higher than the melting point of the heat conductive metal 3 (e.g., copper). Next, a liquid heat conductive metal (e.g., molten copper) is poured into the casting mold, and the flow rate of the pouring is controlled to prevent the generation of bubbles. And cooling after the liquid heat-conducting metal is filled in the mold, and taking down the casting mold after solidification. And then, processing the defects on the surface of the heat-conducting metal 3, and sequentially wrapping an insulating layer 4 and a shell 5.

The method of using the gas electric heater capable of high-temperature heating according to the present embodiment will be described below by taking, as an example, the temperature of hydrogen gas raised from normal temperature to 800 ℃. Firstly, the working conditions of the flow, the pressure and the like of the hydrogen are determined, and the diameter and the length required by the heating pipe and the power of the electric heater are calculated. Then, the gas flow passage pipe is bent to form a flow passage coil pipe 1, and a heating pipe group 2, an explosion-proof junction box 6, a first temperature measuring element 7 and a second temperature measuring element 8 are manufactured. Next, a casting mold is manufactured, and the heating pipe group 2 is placed inside the runner coil 1. The heated liquid heat-conducting metal (e.g., molten copper) is injected into the mold cavity. And cooling, taking down the casting mould after cooling, removing the surface defects of the heat-conducting metal 3, and coating an insulating layer 4 and a shell 5. Next, the wire is connected to the explosion-proof junction box 6, the heating tube set 2 starts to heat up, and after a while, the heating tube set reaches 800 ℃. Normal temperature hydrogen to be heated is led into an inlet 11 of the runner coil 1, the temperature of the inlet and the outlet is monitored to control the hydrogen flow rate, so that the hydrogen can fully absorb heat in the coil, the heating power can be properly increased if necessary, and the temperature reaches 800 ℃ after the hydrogen comes out of the electric heater.

Obviously, the utility model discloses a casting technology is in close contact with runner coil 1 and heating group 2 through heat conduction metal 3 together, and the integrated level is high, small, the heating is effectual.

What has been described above is only the preferred embodiment of the present invention, not for limiting the scope of the present invention, but various changes can be made to the above-mentioned embodiment of the present invention. All the simple and equivalent changes and modifications made according to the claims and the content of the specification of the present invention fall within the scope of the claims of the present invention. The present invention is not described in detail in the conventional technical content.

Claims (9)

1. The utility model provides a but gaseous electric heater of high temperature heating which characterized in that, this gaseous electric heater includes runner coil pipe, heating pipe group and heat conduction metal, and wherein, the heating pipe group nestification is in the inside of runner coil pipe, and runner coil pipe and heating pipe group form wholly through the casting of heat conduction metal together for the heat that heating pipe group produced can pass to the runner coil pipe through heat conduction metal on, thereby the gas of treating of torrent in the heating runner coil pipe.

2. The gas electric heater according to claim 1, further comprising an insulating layer wrapping the outside of the heat conductive metal and a housing wrapping the outside of the insulating layer.

3. The gas electric heater according to claim 2, further comprising an explosion-proof junction box connected to the heating tube set.

4. A gas electric heater according to claim 3, characterised in that the heating banks extend from the insulation and the housing and have non-heating sections.

5. A gas electric heater according to claim 4, characterised in that the heating stack is sealed with epoxy at the non-heating section adjacent to the explosion-proof junction box.

6. A gas electric heater according to claim 1, characterised in that the flow-path coil is formed by bending a whole piece of high-nickel alloy stainless steel tube.

7. A gas electric heater according to claim 1, characterized in that the heating tube bundle comprises two U-shaped heating tubes arranged perpendicular to each other.

8. A gas electric heater according to claim 1, characterised in that the heat conducting metal is copper.

9. The electric gas heater according to claim 1, further comprising a first temperature measuring element disposed at an inlet of the flow path coil and a second temperature measuring element disposed at an outlet of the flow path coil.

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