A high-temperature resistant electric heater

Abstract

This invention relates to the field of electric heater technology, and particularly to a high-temperature resistant electric heater. It includes: a heating element; an electric heating tube arranged circumferentially within the heating element; a warming well arranged axially along the axis of the heating element; and metallurgical powder filling the gaps between the heating element, the electric heating tube, and the warming well. The electric heating tube, the warming well, and the metallurgical powder inside the heating element are formed by high-pressure forging and shrinking. The heating element, the electric heating tube, and the warming well all use Inconel 600 or Inconel 625 alloy, ensuring that the entire heating element can maintain a long-term operating temperature of approximately 1000℃. This invention features a heavy heating element with a large heat capacity during heating, strong resistance to temperature shock, and high single-unit power, making it particularly suitable for fluid heating at temperatures around 1000℃.

Description

Technical Field

[0001] This invention relates to the field of electric heater technology, and in particular to a high-temperature resistant electric heater. Background Technology

[0002] In general high-temperature applications, single-ended high-density heating elements are used. These are made by winding a ceramic core with resistance wire and then adding powder to shrink the tube. Currently, the highest operating temperature is about 870℃. The main problem is that the manufacturing length of this type of single-ended heating element is limited. It is difficult to find a suitable solution for applications requiring greater length and higher temperatures (such as 1000℃). Summary of the Invention

[0003] The purpose of this invention is to provide a high-temperature resistant electric heater with small size and high heat transfer coefficient. The entire heating element is heavy, has a large heat capacity during heating, and strong resistance to temperature shock, making it particularly suitable for heating applications at around 1000℃.

[0004] To solve the above-mentioned technical problems, the present invention provides a high-temperature resistant electric heater, comprising:

[0005] Heating element;

[0006] The heating element is arranged circumferentially inside the heating tube;

[0007] The heating wells are arranged axially along the axis of the heating tube;

[0008] Metallurgical powder is filled in the gap between the heating element, the electric heating element and the temperature well;

[0009] The heating element, the heating well, and the metal metallurgical powder inside the heating element are formed by high-pressure forging and shrinking. The heating element, the heating well, and the heating element all use Inconel 600 or Inconel 625 alloy to ensure that the entire heating element can maintain a long-term operating temperature of around 1000℃.

[0010] Preferably, the heating element comprises: an outer heating tube, magnesium oxide, a heating wire, and a lead rod; the heating wire, which has a spiral structure, is axially inserted into the outer heating tube, and the lead rods are provided at both ends of the heating wire; the magnesium oxide is filled in the gap between the outer heating tube, the heating wire, and the lead rods.

[0011] Preferably, the metallurgical powder is filled according to a certain mesh size to improve the compaction density of the metallurgical powder.

[0012] Preferably, the heating element and the electric heating element are in close contact to ensure a heat transfer channel between them; in addition, the electric heating element and the temperature well are in close contact to ensure the accuracy of the temperature sensor's measurement of the electric heating element's temperature.

[0013] Preferably, it also includes a temperature sensor inserted inside the temperature well, for temperature control of the temperature well and / or for overheat protection of the heating element.

[0014] Preferably, after the filling metal metallurgical powder is vibrated to fill it, the entire heating tube is then sintered at a high temperature of 1050°C to increase the heat transfer channels of the metal metallurgical powder.

[0015] Preferably, the head of the heating element is connected to the lead rod of the heating element using a three-phase power connector, and the junction box of the three-phase power connector adopts an explosion-proof structure design.

[0016] Preferably, the tail of the heating element is Y-shaped and its tail is filled with magnesium oxide as overall insulation.

[0017] Preferably, the outer shell of the heating element is coated with a high-temperature resistant coating with a high emissivity to reduce the temperature of its outer shell.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The heating element, electric heating element, and temperature well designed in this invention all use Inconel 600 or Inconel 625 alloy, ensuring that the entire heating element can be used at a temperature of around 1000°C for a long time.

[0020] 2. The heating element designed in this invention is heavy because the heating element, the heat well, and the metal metallurgical powder are forged together under high pressure. The heating element has a large heat capacity during heating and strong resistance to temperature shock, making it particularly suitable for heating applications with temperatures around 1000℃.

[0021] 3. If the heating element designed in this invention is used in a radiant heating application, the outer shell will be coated with a high-temperature resistant coating with a high emissivity, which can reduce the temperature of the outer shell.

[0022] 4. The gap between the heating tube and the electric heating tube designed in this invention is filled with metal metallurgical powder. After vibration filling, the heating tube is sintered at a high temperature of 1050℃, which further increases the heat transfer channel of the metal metallurgical powder. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of a high-temperature resistant electric heater provided by the present invention.

[0024] Figure 2 This is a schematic diagram of a cross-section of a high-temperature resistant electric heater provided by the present invention.

[0025] Figure 3 This is a schematic diagram of the internal heating wire and lead rod of a high-temperature resistant electric heater provided by the present invention.

[0026] Figure 4 This is a partially enlarged schematic diagram of the internal heating wire and lead rod of a high-temperature resistant electric heater provided by the present invention.

[0027] Figure 5 This is a partially enlarged schematic diagram of the internal temperature well of a high-temperature resistant electric heater provided by the present invention.

[0028] In the diagram: 1-Heating tube, 2-Electric heating tube, 21-Outer heating tube, 22-Magnesium oxide, 23-Heating wire, 24-Initiator rod, 3-Temperature well, 4-Metallurgical powder, 5-Temperature sensor. Detailed Implementation

[0029] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become clearer from the following description. It should be noted that the drawings are all in a very simplified form and use non-precise proportions, and are only used to facilitate and clarify the illustration of the embodiments of the present invention.

[0030] Example 1

[0031] like Figure 1-5 As shown, this invention provides a high-temperature resistant electric heater, comprising: a heating element 1; an electric heating element 2 arranged circumferentially inside the heating element 1; a warming well 3 arranged axially at the axis of the heating element 1; and metallurgical powder 4 filling the gaps between the heating element 1, the electric heating element 2, and the warming well 3, with a very high filling density. The electric heating element 2, the warming well 3, and the metallurgical powder 4 inside the heating element 1 are formed by high-pressure forging and shrinking, resulting in a heavy heating element 1 with a large heat capacity and strong resistance to temperature shock, making it particularly suitable for heating applications at around 1000℃. The heating element 1, the electric heating element 2, and the warming well 3 all use Inconel 600 or Inconel 625 alloy, ensuring that the entire heating element 1 can maintain a long-term operating temperature of around 1000℃.

[0032] The heating element 2 includes: an outer heating tube 21, magnesium oxide 22, a heating wire 23, and a lead rod 24; a spiral heating wire 23 is axially inserted into the outer heating tube 21, and lead rods 24 are provided at both ends of the heating wire 23. Magnesium oxide 22 is filled in the gap between the outer heating tube 21, the heating wire 23, and the lead rods 24.

[0033] Metallurgical powder 4 will be filled according to a certain mesh size to improve the compaction density of metallurgical powder 4.

[0034] It also includes a temperature sensor 5 installed inside the temperature well 3, for temperature control of the temperature well 3 and / or for overheat protection of the heating element 2.

[0035] The head of the heating element 1 will be connected to the lead rod 24 of the heating element 2 using a three-phase power connector, and the junction box of the three-phase power connector adopts an explosion-proof structure design.

[0036] The tail of heating element 1 is Y-shaped and is filled with magnesium oxide 22 as overall insulation.

[0037] Example 2

[0038] like Figure 1-5 As shown, based on the above embodiment one, the heating tube 1 and the electric heating tube 2 are in close contact to ensure the heat transfer channel between the electric heating tube 2 and the heating tube 1; in addition, the electric heating tube 2 and the temperature well 3 are in close contact to ensure the accuracy of the temperature sensor 5 in measuring the temperature of the electric heating tube 2.

[0039] After the filling metal metallurgical powder 4 is vibrated and compacted, the entire heating tube 1 is sintered at a high temperature of 1050℃ to increase the heat transfer channels of the metal metallurgical powder 4.

[0040] Example 3

[0041] like Figure 1-5 As shown, based on the above embodiment 2, the outer shell of the heating tube 1 is coated with a high-temperature resistant coating with a high emissivity to reduce the temperature of its outer shell.

[0042] The advantages of this invention are: 1. Several heating elements are integrated into a single unit, allowing for high power output from a single element, meeting the requirements for high-power output. 2. The surface load of the heating element is much lower than that of the heating element, increasing its service life. 3. Direct contact between the heating elements ensures excellent heat transfer, and the contact between the heating element and the central temperature sensor minimizes temperature lag, resulting in more precise temperature control and a longer overall lifespan.

[0043] The above description is merely a description of preferred embodiments of the present invention and is not intended to limit the scope of the present invention in any way. Any changes or modifications made by those skilled in the art based on the above disclosure shall fall within the protection scope of the claims.

Claims

1. A high-temperature resistant electric heater, characterized in that, include: Heating element (1); The heating element (2) is arranged circumferentially inside the heating element (1); The heating well (3) is arranged axially at the axis of the heating tube (1); Metal metallurgical powder (4) is filled in the gap between the heating tube (1), the electric heating tube (2) and the temperature well (3); The heating tube (1) contains an electric heating tube (2), a temperature well (3), and metal metallurgical powder (4), which are formed by high-pressure forging and shrinking. The heating tube (1), the electric heating tube (2), and the temperature well (3) all use Inconel 600 or Inconel 625 alloy to ensure that the entire heating tube (1) can maintain a long-term operating temperature of around 1000℃.

2. The high-temperature resistant electric heater as described in claim 1, characterized in that, The heating element (2) includes: an outer heating tube (21), magnesium oxide (22), a heating wire (23), and a lead rod (24); the heating wire (23) is axially inserted into the outer heating tube (21), and the lead rod (24) is provided at both ends of the heating wire (23). The magnesium oxide (22) is filled in the gap between the outer heating tube (21), the heating wire (23), and the lead rod (24).

3. A high-temperature resistant electric heater as described in claim 1, characterized in that, The metallurgical powder (4) will be filled according to a certain mesh size to improve the compaction density of the metallurgical powder (4).

4. A high-temperature resistant electric heater as described in claim 1, characterized in that, The heating element (1) is in close contact with the electric heating element (2) to ensure the heat transfer channel between the electric heating element (2) and the heating element (1); in addition, the electric heating element (2) is in close contact with the temperature well (3) to ensure the accuracy of the temperature sensor (5) in measuring the temperature of the electric heating element (2).

5. A high-temperature resistant electric heater as described in claim 1, characterized in that, It also includes a temperature sensor (5) inserted inside the temperature well (3) for temperature control of the temperature well (3) and / or for overheat protection of the heating tube (2).

6. A high-temperature resistant electric heater as described in claim 1, characterized in that, After the metal metallurgical powder (4) is vibrated and compacted, the entire heating tube (1) is sintered at a high temperature of 1050°C to increase the heat transfer channels of the metal metallurgical powder (4).

7. A high-temperature resistant electric heater as described in any one of claims 1-6, characterized in that, The head of the heating element (1) will be connected to the lead rod (24) of the heating element (2) using a three-phase power connector, and the junction box of the three-phase power connector adopts an explosion-proof structure design.

8. A high-temperature resistant electric heater as described in any one of claims 1-6, characterized in that, The tail of the heating tube (1) is Y-shaped and is filled with magnesium oxide (22) as overall insulation.

9. A high-temperature resistant electric heater as described in any one of claims 1-6, characterized in that, The outer shell of the heating element (1) is coated with a high-temperature resistant coating with a high emissivity to reduce the temperature of its outer shell.

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