Heating device and fan heater

Abstract

The invention discloses a heating device and a fan heater. The heating device comprises at least one heating module and a heat dissipation inner pipe. A plurality of shunting channels are arranged in the heat dissipation inner pipe; the heating module comprises a base material pipe and a heating part formed on the outer surface of the base material pipe, the base material pipe is provided with a through axial notch, and the base material pipe elastically and tightly holds the outer surface of the middle of the heat dissipation inner pipe; the two ends of the heat dissipation inner pipe are sleeved with hoops respectively, the two hoops are pressed at the two ends of the base material pipe respectively, and the hoops and the heating part are arranged in a spaced mode in the axial direction. According to the heating device and the fan heater provided by the invention, the heat transfer path can be optimized fundamentally, the contact thermal resistance is reduced, and the heat conduction efficiency is high; and the structure is simple, the assembly is convenient, and the connection is reliable.

Description

Technical Field

[0001] This invention relates to the field of electrothermal technology, specifically a heating device and a warm air blower. Background Technology

[0002] Tubular heating elements and the resulting air heaters are common electric heating devices widely used in home, industrial, and commercial air heating applications. Their performance indicators include thermal efficiency, response speed, safety and reliability, and service life.

[0003] Currently, the mainstream tubular electric heating structures on the market mainly take the following forms:

[0004] Exposed resistance wire type: The heating wire is directly spirally wound onto a ceramic or mica insulating frame, and heat exchange is achieved by forced airflow from a fan. This solution has a simple structure, but it has obvious drawbacks such as low thermal efficiency, easy oxidation and aging of the heating wire, poor insulation performance, and the risk of electric shock or fire.

[0005] Metal tubular heating elements: This is currently the most widely used form, where the heating wire is sealed inside a metal sheath filled with an insulating and thermally conductive medium (such as magnesium oxide powder). While this structure solves the problems of insulation and oxidation prevention, its manufacturing process is complex, and it inherently suffers from long heat conduction paths and high thermal resistance of the intermediate medium, resulting in slow thermal response and room for improvement in overall thermal efficiency. Furthermore, these elements are typically fixed to heat sinks by welding or mechanical clips, creating contact thermal resistance that affects the efficiency of heat transfer to the air.

[0006] Die-cast aluminum heaters: These heaters incorporate tubular metal heating elements into aluminum castings, utilizing aluminum's high thermal conductivity to increase the heat dissipation area. While this method offers excellent heat dissipation, it suffers from high mold costs, a bulky structure, and is irreparable if damaged. Furthermore, microscopic air gaps may still exist between the heating element and the aluminum casting, creating interfacial thermal resistance.

[0007] A common technical challenge faced by existing technologies is how to achieve an efficient, reliable, and low-thermal-resistance tight connection between heating elements and heat dissipation components. Traditional fixing methods (such as welding, clamping, or die casting) are prone to loosening and poor contact due to thermal stress, or are costly due to complex processes, or affect the final thermal performance due to interfacial thermal resistance.

[0008] Therefore, there is an urgent need for a new type of heating device to solve the above-mentioned technical problems. Summary of the Invention

[0009] To address the above-mentioned technical problems, this invention provides a heating device and a warm air blower that can fundamentally optimize the heat transfer path, reduce contact thermal resistance, and achieve high heat conduction efficiency; it also has the advantages of simple structure, convenient assembly, and reliable connection.

[0010] To achieve the above objectives, the technical solution of the present invention is as follows:

[0011] A heating device includes at least one heating module and a heat dissipation inner tube; the heat dissipation inner tube is provided with a plurality of diversion channels;

[0012] The heating module includes a substrate tube and a heating part formed on the outer surface of the substrate tube. The substrate tube has a through axial cut and the substrate tube is elastically held to the middle outer surface of the heat dissipation inner tube.

[0013] The heat dissipation inner tube is fitted with a sleeve at both ends, and the two sleeves are pressed tightly against the two ends of the base tube. The sleeves are axially spaced from the heat-generating part.

[0014] This heating device achieves a large-area, zero-gap, tight metal-to-metal contact by creating axial cuts in the base tube, thus virtually eliminating air gaps at the interface and minimizing thermal resistance. Heat generated by the heating element can be transferred unimpeded and instantaneously to the heat dissipation inner tube through the base tube, resulting in a direct and efficient heat conduction path. Two clamps effectively prevent the heating module from loosening or rotating on the heat dissipation inner tube during heating. Furthermore, the manufacturing process eliminates the need for welding, riveting, and screw fixation, resulting in high assembly efficiency. The axial spacing between the clamps and the heating element prevents electrical leakage and ensures safety. The multiple flow channels within the heat dissipation inner tube quickly transfer heat to the cool air and reduce airflow noise.

[0015] In a further optimized design, the connection points between the clamp and the heat dissipation inner tube and the base material tube are respectively interference fits. These interference fits ensure a stable connection between the clamp and the heat dissipation inner tube and the base material tube.

[0016] In a further optimized design, the sleeve is provided with a stepped hole. The larger diameter end of the stepped hole connects to the base material tube, and the smaller diameter end connects to the heat dissipation inner tube. The stepped surface of the stepped hole is positioned on the end face of the base material tube. The stepped hole can position and fix the base material tube on the heat dissipation inner tube, ensuring the stability of their relative positions.

[0017] A further optimized solution includes a heat dissipation outer tube, with the two clamps fitted inside the heat dissipation outer tube. The design of the heat dissipation outer tube accelerates heat transfer.

[0018] In a further optimized design, several axially extending heat dissipation fins are provided on the outer surface of the heat dissipation outer pipe. The addition of these fins increases the heat dissipation area of ​​the outer pipe.

[0019] A further optimized design incorporates an axially penetrating slot on the inner cylinder of the heat dissipation outer tube. This slot effectively absorbs and compensates for stress caused by thermal expansion and contraction, preventing the connection between the heat dissipation outer tube and the sleeve from loosening or cracking over time.

[0020] A further optimized design includes three heating modules and a heat dissipation inner tube, evenly distributed around the circumference of the two clamps. The three heating modules can be used in high-power heating devices.

[0021] A further optimized design includes several axially penetrating circular and / or fan-shaped ventilation holes on the sleeve. These axially penetrating ventilation holes increase the air intake and exhaust volume, thereby increasing the heat transfer efficiency of the heating device.

[0022] A heater includes any of the heating devices described above, with a cold airflow axially passing through the heating device.

[0023] The heating device and warm air blower of the present invention have the following technical advantages compared with the prior art:

[0024] 1. Significantly improves thermal efficiency and provides rapid thermal response.

[0025] By using axial cuts on the base tube to elastically hold it tightly against the inner heat dissipation tube, a large-area, zero-gap close contact between the metals is achieved, almost completely eliminating the interfacial air gaps present in traditional assembly, thereby minimizing contact thermal resistance. This allows the heat generated by the heat-generating part to be transferred to the heat dissipation system without obstruction and instantaneously, significantly improving heat conduction efficiency and heating speed.

[0026] 2. The connection is stable and reliable, with strong resistance to thermal stress.

[0027] The device employs a dual fixing mechanism of radial elastic clamping and axial clamping. The elastic structure effectively absorbs and compensates for stress caused by thermal expansion and contraction, preventing loosening or cracking of the connection over long-term use; the clamps at both ends ensure the absolute stability of the heating module in the axial position, preventing it from sliding or rotating, making the overall structure robust and durable.

[0028] 3. Simple assembly process and convenient maintenance.

[0029] The entire device can be assembled without welding, riveting, or screws. Simply unfold the base tube, insert it into the heat dissipation inner tube, and then tighten it from both ends using clamps. This modular design greatly simplifies the production process, improves assembly efficiency, and allows for quick replacement of damaged heat dissipation modules, significantly reducing maintenance costs and time.

[0030] 4. Excellent electrical safety and heat dissipation performance.

[0031] The clamp and the live heating element are axially spaced, forming a safety isolation zone that fundamentally prevents the risk of short circuits or leakage that may be caused by the metal clamp, ensuring safe use. In addition, the optimized design of the heat dissipation inner and outer tubes and fins together create a highly efficient thermal management system that can quickly transfer heat to the flowing cool air, achieving efficient, uniform, and low-noise heating. Attached Figure Description

[0032] Figure 1 This is a perspective view of the first specific embodiment of the heating device of the present invention;

[0033] Figure 2 yes Figure 1 Exploded view;

[0034] Figure 3 yes Figure 1 Top view;

[0035] Figure 4 yes Figure 3 AA section view;

[0036] Figure 5 yes Figure 2 A three-dimensional view of the interior of the central hoop.

[0037] Figure 6 yes Figure 2 A 3D view showing the combination of the central heating module and the internal heat dissipation pipe;

[0038] Figure 7 yes Figure 6 A 3D view of the heating module;

[0039] Figure 8 yes Figure 7 Top view;

[0040] Figure 9 yes Figure 6 Top view of the inner heat dissipation tube;

[0041] Figure 10 Figure 1 The embodiment includes a perspective view of the heat dissipation outer tube;

[0042] Figure 11 yes Figure 10 Top view;

[0043] Figure 12 yes Figure 10 Exploded view;

[0044] Figure 13 This is a perspective view of a specific second embodiment of the heating device of the present invention;

[0045] Figure 14 yes Figure 13The main view.

[0046] In the figure: heating module 10, base tube 11, axial cut 11a, heating part 12, heat dissipation inner tube 20, inner cylinder 21, outer cylinder 22, axial channel 23, diversion channel 24, sleeve 30, stepped hole 31, ventilation hole 32, heat dissipation outer tube 40, heat dissipation fins 41, opening slot 42. Detailed Implementation

[0047] The present invention will now be described in further detail with reference to the embodiments shown in the accompanying drawings.

[0048] like Figures 1 to 12 As shown, this is the first embodiment of the heating device of the present invention; as Figure 13 and Figure 14 As shown, this is a second embodiment of the heating device of the present invention.

[0049] like Figure 1 and Figure 2 As shown, the heating device of the first embodiment includes at least one heating module 10 and a heat dissipation inner tube 20; preferably, the heating device includes three heating modules 10 and heat dissipation inner tubes 20.

[0050] like Figure 7 and Figure 8 As shown, the heating module 10 includes a substrate tube 11 and a heating part 12 formed on the outer surface of the substrate tube 11. The substrate tube 11 is provided with a through axial cut 11a, and the substrate tube 11 is elastically held to the middle outer surface of the heat dissipation inner tube 20.

[0051] like Figure 1 and Figure 2 As shown, each end of the heat dissipation inner tube 20 is fitted with a clamp 30, which is pressed against both ends of the base tube 11. The clamps 30 are axially spaced from the heating element 12. The three heat dissipation inner tubes 20 are evenly distributed on the circumference of the two clamps 30. The three heating modules 10 can be used for high-power heating devices.

[0052] This heating device achieves a large-area, zero-gap, tight metal-to-metal contact by making an axial cut 11a in the base tube 11 to elastically hold the heat dissipation inner tube 20, thereby virtually eliminating air gaps between interfaces and minimizing thermal resistance. The heat generated by the heating element 12 can be transferred to the heat dissipation inner tube 20 instantly and without obstruction through the base tube 11, making the heat conduction path direct and efficient. The two clamps 30 effectively prevent the heating module 10 from loosening or rotating on the heat dissipation inner tube 20 during the heating process. Moreover, no welding or riveting is required during manufacturing, and no screws are needed for fixing, resulting in high assembly efficiency. The axial spacing between the clamps 30 and the heating element 12 prevents leakage and ensures safety.

[0053] like Figure 1 and Figure 4As shown, the connection points between the clamp 30 and the heat dissipation inner tube 20 and the base material tube 11 are interference fits. The interference fits ensure a stable connection between the clamp 30 and the heat dissipation inner tube 20 and the base material tube 11.

[0054] like Figure 4 and Figure 5 As shown, the sleeve 30 has a stepped hole 31. The large-diameter end of the stepped hole 31 is connected to the base material tube 11, and the small-diameter end of the stepped hole 31 is connected to the heat dissipation inner tube 20. The stepped surface of the stepped hole 31 is positioned on the end face of the base material tube 11. The stepped hole 31 can position and fix the base material tube 11 on the heat dissipation inner tube 20, ensuring the stability of their relative positions.

[0055] like Figure 2 and Figure 3 As shown, the sleeve 30 is provided with a number of axially penetrating circular ventilation holes 32. Preferably, the sleeve 30 has a circular ventilation hole 32 at its center and three evenly distributed circular ventilation holes 32 around its perimeter.

[0056] like Figure 6 and Figure 9 As shown, the heat dissipation inner tube 20 includes an inner cylinder 21 and an outer cylinder 22. The inner cylinder 21 has a central channel 23, and several diversion channels 24 are provided between the inner cylinder 21 and the outer cylinder 22. The structure of the central channel 23 and the diversion channels 24 on the heat dissipation inner tube 20 can quickly conduct heat to the cold air and also reduce the noise of the airflow.

[0057] like Figure 10 , Figure 11 and Figure 12 As shown, the heating device also includes a heat dissipation outer tube 40, with two sleeves 30 fitted inside the heat dissipation outer tube 40. The design of the heat dissipation outer tube 40 accelerates heat transfer.

[0058] like Figure 10 and Figure 11 As shown, the outer surface of the heat dissipation outer tube 40 is provided with a number of axially extending heat dissipation fins 41. The provision of a number of heat dissipation fins 41 increases the heat dissipation area of ​​the heat dissipation outer tube 40.

[0059] like Figure 13 and Figure 14 As shown, the second embodiment of the heating device of the present invention differs from the first embodiment in that: firstly, the three evenly distributed circular ventilation holes 32 on the four sides of the sleeve 30 are replaced with fan-shaped ventilation holes, which can increase the air intake and exhaust area; secondly, an axially penetrating opening groove 42 is provided on the inner cylinder of the heat dissipation outer tube 40. The opening groove 42 can effectively absorb and compensate for the stress caused by thermal expansion and contraction, and avoid the connection between the heat dissipation outer tube 40 and the sleeve 30 becoming loose or cracking itself under long-term use.

[0060] The present invention also discloses a space heater, including the heating device of any of the above embodiments, through which a cold airflow passes axially. This heating device is not limited to space heaters, but can also be applied to other heating devices such as hair dryers.

[0061] The heating device and warm air blower of the present invention can fundamentally optimize the heat transfer path, reduce contact thermal resistance, and achieve high heat conduction efficiency; at the same time, they have the advantages of simple structure, convenient assembly, and reliable connection.

[0062] In summary, as described in the specification and figures, this invention has been manufactured into actual samples and tested multiple times. The test results demonstrate that the invention achieves its intended purpose, and its practicality is beyond doubt. The embodiments described above are merely for illustrative purposes and are not intended to limit the scope of the invention. Any equivalent embodiments made by those with common knowledge in the relevant technical field, utilizing the technical content disclosed in this invention without departing from the scope of the technical features and similar features of this invention, based on partial modifications or alterations, are within the protection scope of this invention.

Claims

1. A heat generating device, characterized by: It comprises at least one heat generating module (10) and a heat dissipating inner tube (20), wherein a plurality of shunt channels (24) are arranged in the heat dissipating inner tube (20). The heat generating module (10) comprises a base material tube (11) and a heat generating part (12) formed on the outer surface of the base material tube (11), wherein the base material tube (11) is provided with an axial cut (11a) penetrating through the base material tube (11), and the base material tube (11) is elastically held on the outer surface of the middle part of the heat dissipating inner tube (20). The heat dissipating inner tube (20) is provided with a hoop (30) at each end, and the two hoops (30) are pressed on the two ends of the base material tube (11), respectively, and the hoop (30) is axially spaced apart from the heat generating part (12).

2. The heat generating device according to claim 1, characterized in that The connection between the hoop (30) and the heat dissipating inner tube (20) and the base material tube (11) is an interference fit.

3. The heat generating device of claim 1, wherein The hoop (30) is provided with a stepped hole (31), the large diameter end of the stepped hole (31) is connected to the base material tube (11), the small diameter end of the stepped hole (31) is connected to the heat dissipating inner tube (20), and the stepped surface of the stepped hole (31) is positioned on the end surface of the base material tube (11).

4. The heat generating device of claim 1, wherein It further comprises a heat dissipating outer tube (40), and the two hoops (30) are arranged in the heat dissipating outer tube (40).

5. The heat generating device of claim 4, wherein A plurality of axially extending heat dissipation fins (41) are arranged on the outer surface of the heat dissipating outer tube (40).

6. The heat generating device of claim 4, wherein An axially penetrating open slot (42) is arranged on the inner cylinder of the heat dissipating outer tube (40).

7. The heat generating device of claim 1, wherein It comprises three heat generating modules (10) and heat dissipating inner tubes (20), which are uniformly distributed on the circumference of the two hoops (30).

8. The heat generating device of claim 7, wherein A plurality of axially penetrating circular or / and fan-shaped ventilation holes (32) are arranged on the hoop (30).

9. A fan heater characterised in that: It comprises the heat generating device of any one of claims 1 to 8, and the cold air flow axially passes through the heat generating device.

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