Electric heating tube with good heat dissipation

Abstract

The utility model provides an electric heating tube with good heat dissipation, which comprises an outer tube which is bent to be U-shaped, an inner tube is inserted into the outer tube, a plurality of second raised lines are arranged on the side wall of the inner tube at equal angles, an electric heating wire is spirally wound on the side wall of the inner tube, and a groove is formed in the contact part of the second raised lines and the electric heating wire. A plurality of first protruding strips are arranged in the outer pipe at equal angles, and the space between the outer pipe and the inner pipe is filled with magnesium oxide. The electric heating tube is provided with the first convex strips and the second convex strips, so that the use amount of magnesium oxide is reduced, and the heat exchange effect of the electric heating tube is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric heating tube, in particular to an electric heating tube with good heat dissipation. BACKGROUND

[0002] Electric heating tube is a tubular electric heating element which is composed of metal tube, spiral resistance wire and crystalline magnesium oxide powder. The electric heating tube product is generally made of high-quality stainless steel tube, high-temperature magnesium oxide powder and high-quality electric heating wire as the heating element, and other structural parts made of stainless steel, which has excellent overall performance, super-long service life and easy maintenance.

[0003] That is, in the production of the existing heating tube, the electric heating wire is mostly sent into the stainless steel tube in a spiral manner, and then the magnesium oxide powder is poured. During the process, the electric heating wire is inevitably unevenly distributed, and the distance from the electric heating wire to the inside of the stainless steel tube has a large overall error, resulting in uneven heat exchange. The farther the electric heating wire is from the stainless steel tube, the lower the heat exchange efficiency. SUMMARY

[0004] To solve the above problems, the present application discloses an electric heating tube with good heat dissipation, which comprises an outer tube bent into a U shape, an inner tube inserted into the inner part of the outer tube, a plurality of second protrusions arranged at equal angles on the side wall of the inner tube, an electric heating wire spirally wound on the side wall of the inner tube, a groove arranged at the contact between the second protrusion and the electric heating wire, a plurality of first protrusions arranged at equal angles in the inner part of the outer tube, and magnesium oxide filled between the outer tube and the inner tube. The arrangement of the first protrusions and the second protrusions increases the surface area of the outer tube and the inner tube, thereby improving the rate of heat transfer. At the same time, the first protrusions are arranged close to the electric heating wire, and the heat transfer path from the magnesium oxide is shorter. The arrangement of the second protrusions avoids the direct winding of the electric heating wire on the inner tube, and the groove arrangement makes the electric heating wire more evenly distributed. In addition, the inner tube is hollow, which can reduce the amount of magnesium oxide used and reduce production costs. The thermal conductivity of magnesium oxide is not high, and the use of magnesium oxide is reduced. The arrangement of the first protrusions can improve the efficiency of electric heating.

[0005] Preferably, the end of the outer tube is provided with a terminal, and the terminal is electrically connected with the electric heating wire. The terminal is used for the connection of external cables to provide electric energy.

[0006] Preferably, the end of the outer tube is fixedly connected with a connecting sleeve, and the side wall of the connecting sleeve is provided with threads. The electric heating tube is fixedly connected to the support member by cooperating with the nut, gasket, sealing sleeve and other components.

[0007] Preferably, the side wall of the inner tube is equidistantly sleeved with a support sleeve. The arrangement of the support sleeve ensures that the distance between the inner tube and the outer tube is consistent, avoiding the friction between the electric heating wire and the first protrusions caused by vibration and other factors, and causing damage and leakage.

[0008] Preferably, the side wall of the outer tube is provided with a chromium plating layer. The chromium plating layer is provided to improve the surface performance of the electric heating tube, i.e. corrosion resistance, wear resistance and the like.

[0009] Preferably, the outer tube and the inner tube are both formed by extrusion of aluminum alloy. That is, the outer tube and the inner tube are both aluminum alloy profiles.

[0010] Preferably, the electric heating wire is wrapped with an insulating sleeve. The insulating sleeve can be made of polyimide, which can prevent the electric heating wire from leaking electricity.

[0011] The beneficial effects of the present application are as follows:

[0012] 1. The first protrusion and the second protrusion are provided, the electric heating wire is spirally wound on the inner tube, the distance between the electric heating wire and the outer tube is kept consistent, and the first protrusion is arranged closer to the electric heating wire, which ensures high-efficiency heat exchange.

[0013] 2. The recess is arranged on the second protrusion, and the electric heating wire can be fitted in the recess, which ensures uniform distribution of the electric heating wire after production of the electric heating tube, and avoids local heat accumulation and other problems.

[0014] 3. The inner tube is arranged, and the inner tube is hollow and does not need to be filled with magnesium oxide, which can relatively reduce the material cost and reduce the weight. In addition, the inner tube and the outer tube are both made of aluminum alloy profiles, the aluminum part has good heat conduction performance, and the rapid heating of the material is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a schematic diagram of the overall structure of the present application;

[0016] Figure 2 is a partial perspective view of the inner tube of the present application;

[0017] Figure 3 is a cross-sectional view of the present application;

[0018] Figure 4 is Figure 1 is an enlarged view of position A in FIG. 4.

[0019] LIST OF REFERENCE NUMBERS:

[0020] 1. outer tube; 2. electric heating wire; 3. support sleeve; 4. inner tube; 5. chromium plating layer; 6. first protrusion; 7. second protrusion; 8. connecting sleeve; 9. terminal. DETAILED DESCRIPTION

[0021] The present invention will be further illustrated below with reference to the accompanying drawings and specific embodiments. It should be understood that the following specific embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to directions in the accompanying drawings, and the terms "inner" and "outer" refer to directions toward or away from the geometric center of a specific component, respectively.

[0022] like Figures 1 to 4 As shown, an electric heating tube with good heat dissipation includes an outer tube 1 bent into a U-shape. Depending on the application, the outer tube 1 can also be bent into other shapes, such as a spiral. An inner tube 4 is inserted inside the outer tube 1. Several second protrusions 7 are provided at equal angles on the sidewall of the inner tube 4. A heating wire 2 is spirally wound around the sidewall of the inner tube 4. The heating wire 2 is wound around the second protrusions 7, ensuring that most of the heating wire 2 is suspended and does not directly contact the inner tube 4. A groove is provided at the contact point between the second protrusions 7 and the heating wire 2, which limits the movement of the heating wire and ensures proper heating. After the electric heating tube is produced, the heating wire 2 is evenly distributed on the inner tube 4, ensuring uniform heating and avoiding damage caused by local heat accumulation. Several first protrusions 6 are set at equal angles inside the outer tube 1. The first protrusions 6 increase the inner wall surface area of ​​the outer tube 1 and are closer to the heating wire, which is conducive to heat transfer and rapid heat dissipation for heating materials. Magnesium oxide is filled between the outer tube 1 and the inner tube 4. The inner tube 4 does not need to be filled with magnesium oxide, reducing the amount of magnesium oxide used and thus reducing material costs. At the same time, the setting of the first protrusions 6 and the second protrusions 7, as well as the reduction of magnesium oxide usage, improves the heat exchange efficiency.

[0023] The end of the outer tube 1 is provided with a terminal 9, which is electrically connected to the heating wire 2. The terminal 9 is connected to an external power source, and the heating wire 2 generates heat when energized.

[0024] A connecting sleeve 8 is fixedly connected to the end side wall of the outer tube 1. The connecting sleeve 8 is made of copper and is fixedly connected to the side wall of the outer tube 1 by brazing. It should be noted that the connecting sleeve 8 is fixedly connected to the non-heating section of the outer tube. The side wall of the connecting sleeve 8 is threaded, and the electric heating tube is fixed to the support using nuts, washers and other components.

[0025] Support sleeves 3 are fitted at equal intervals on the side walls of the inner tube 4. The purpose of the support sleeves 3 is to ensure the distance between the inner tube 4 and the outer tube 1. The support sleeves 3 are rigid structures. Depending on the final shape of the electric heating tube and the difficulty of pouring magnesium oxide powder, the support sleeves 3 can be omitted.

[0026] The outer tube 1 has a chrome-plated layer 5 on its side wall. The chrome-plated layer 5 improves the corrosion resistance and wear resistance of the electric heating tube.

[0027] The outer tube 1 and the inner tube 4 are both formed by aluminum alloy extrusion molding, that is, the outer tube 1 and the inner tube 4 are profiled pieces, and the thermal conductivity of aluminum material is excellent.

[0028] The insulating sleeve is wrapped on the electric heating wire 2 to increase the use safety of the electric heating tube, but a high-temperature-resistant material, such as polyimide, needs to be used.

[0029] The technical means disclosed in the scheme of the present application are not limited to the technical means disclosed in the above-mentioned embodiments, and also include technical solutions composed of any combination of the above technical features.

Claims

1. An electric heating element with good heat dissipation, characterized in that, The device includes an outer tube (1) bent into a U-shape, an inner tube (4) inserted inside the outer tube (1), a number of second protrusions (7) are provided at equal angles on the side wall of the inner tube (4), an electric heating wire (2) is spirally wound on the side wall of the inner tube (4), and a groove is provided at the contact point between the second protrusions (7) and the electric heating wire (2), a number of first protrusions (6) are provided at equal angles inside the outer tube (1), and magnesium oxide is filled between the outer tube (1) and the inner tube (4).

2. The electric heating tube with good heat dissipation according to claim 1, characterized in that: The end of the outer tube (1) is provided with a wiring terminal (9), which is electrically connected to the heating wire (2).

3. The electric heating tube with good heat dissipation according to claim 1, characterized in that: The end sidewall of the outer tube (1) is fixedly connected to a connecting sleeve (8), and the sidewall of the connecting sleeve (8) is provided with threads.

4. The electric heating tube with good heat dissipation according to claim 1, characterized in that: The inner tube (4) has support sleeves (3) sleeved at equal intervals on its side wall.

5. The electric heating tube with good heat dissipation according to claim 1, characterized in that: The outer tube (1) has a chrome plating layer (5) on its side wall.

6. The electric heating tube with good heat dissipation according to claim 1, characterized in that: Both the outer tube (1) and the inner tube (4) are made of aluminum alloy by extrusion molding.

7. The electric heating tube with good heat dissipation according to claim 1, characterized in that: An insulating sleeve is provided on the heating wire (2).

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