Hot air heater

Abstract

The invention discloses a hot air heater which comprises a shell, a plurality of identical iron heating sheets provided with through holes are stacked in the shell, and the through holes are slightly staggered when the adjacent iron heating sheets are stacked, so that the iron heating sheets form spiral or bent airflow channels corresponding to the small holes. An electrified coil is wound on the periphery of the stacked iron heating sheets, and high-frequency current with high-speed change flows through the coil. The heating device has the advantages of being high in heating efficiency and capable of rapidly heating.

Description

Technical Field

[0001] The present invention relates to the field of gas heating, and particularly to a hot air heater with high heating efficiency and capable of quickly heating air. Background Art

[0002] In daily life, devices such as electric hair dryers and atomizers need to heat air. Currently, it is common to heat the air when it flows through an electric heating wire. However, the electric heating wire heats up slowly and has a low efficiency, approximately 65% - 70%, because heat needs to be conducted through the resistance wire and a significant amount of heat is lost during the process. Summary of the Invention

[0003] To solve the above problems, the purpose of the present invention is to provide a hot air heater with high heating efficiency and capable of quickly heating air.

[0004] The present invention is achieved through the following technical measures. A hot air heater includes a housing. Inside the housing, multiple identical iron heating sheets with through holes are stacked. When adjacent iron heating sheets are stacked, the through holes are slightly offset, so that the corresponding small holes of each iron heating sheet form a spiral or bent air flow channel. A energized coil is wound around the outer periphery of the stacked iron heating sheets, and a high-frequency current with rapid changes flows through the coil.

[0005] As a preferred embodiment, positioning protrusions extend circumferentially on the iron heating sheets, and spiral or bent grooves are provided on the inner wall of the housing corresponding to the positioning protrusions.

[0006] As a preferred embodiment, positioning grooves extend circumferentially on the iron heating sheets, and spiral or bent protrusions are provided on the inner wall of the housing corresponding to the positioning grooves.

[0007] As a preferred embodiment, a protective tube is sleeved outside the stacked iron heating sheets. An insulating tube is sleeved outside the metal tube, and the coil is sleeved outside the insulating tube.

[0008] As a preferred embodiment, a housing is sleeved outside the coil, and a heat insulation sleeve is hermetically arranged between the coil and the housing.

[0009] As a preferred embodiment, the inner empty length of the housing is longer than the stacked iron heating sheets. A sealing sleeve with an inner diameter smaller than that of the iron heating sheet is provided outside the air outlet of the stacked iron heating sheets. The outer diameter of the sealing sleeve is the same as that of the heat insulation sleeve and is fitted and inserted into the housing.

[0010] As a preferred embodiment, a copper disc with a diameter smaller than that of the iron heating sheet is further provided between the stacked iron heating sheets and the sealing sleeve.

[0011] As a preferred embodiment, an annular groove is provided on the sealing sleeve corresponding to the copper disc.

[0012] As a preferred embodiment, the bottom of the housing is provided with a bottom cover having an air inlet hole. In the present invention, multiple identical iron heating sheets provided with through holes are stacked. A coil through which a high-speed variable high-frequency current flows generates an alternating magnetic field, causing eddy currents to be generated in the iron heating sheets, thereby heating the gas flowing through. The present invention uses an iron object that can generate eddy currents under electromagnetic induction to be processed into a sheet shape, so that the processing is convenient and different thicknesses can be combined. At the same time, through holes are provided at the same positions in the sheet shape, and when assembled, the through holes are slightly staggered, so that the corresponding small holes in each iron heating sheet form a spiral or bent air flow channel, increasing the heat exchange area, so that the gas flowing through can be fully heated. The present invention can fully improve the heating efficiency through electromagnetic heating, making the heating speed faster. At the same time, a spiral or bent air flow channel is formed by using iron heating sheets with slightly staggered through holes, so that the processing is simpler and the assembly is convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic structural view of an embodiment of a hot air heater of the present invention.

[0014] Figure 2 It is an exploded schematic view of an embodiment of a hot air heater of the present invention.

[0015] Figure 3 It is a cross-sectional view of an embodiment of a hot air heater of the present invention.

[0016] Figure 4 It is a top view of a control board of an embodiment of a hot air heater of the present invention.

[0017] Figure 5 It is a schematic structural view of multiple stacked iron heating sheets of an embodiment of a hot air heater of the present invention.

[0018] Figure 6 It is a schematic structural view of multiple stacked iron heating sheets of another embodiment of a hot air heater of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0019] The present invention will be further described in detail below with reference to the embodiments and the accompanying drawings.

[0020] A hot air heater according to this embodiment, please refer to the attached Figures 1 to 5 , which includes a housing. Multiple identical iron heating sheets 4 provided with through holes are stacked in the housing. When adjacent iron heating sheets 4 are stacked, the through holes are slightly staggered, so that the corresponding small holes in each iron heating sheet 4 form a spiral or bent air flow channel. A energized coil 7 is wound around the outer periphery of the stacked iron heating sheets 4, and a high-speed variable high-frequency current flows through the coil 7.

[0021] This device uses multiple identical iron heating sheets 4 with through holes stacked in 4 layers. A coil 7 with a high-speed changing high-frequency current flowing through it generates an alternating magnetic field, causing eddy currents to be generated in the iron heating sheets 4, thereby heating the gas flowing through. In the present invention, an iron object that can generate eddy currents under electromagnetic induction is processed into a sheet shape, which is convenient for processing and can be combined into different thicknesses. At the same time, through holes are arranged at the same positions in the sheet shape, and when assembling, the through holes are slightly staggered, so that the corresponding small holes of each iron heating sheet 4 form a spiral or bent air flow channel, increasing the heat exchange area, and enabling the gas flowing through to be fully heated. Through electromagnetic heating, the present invention can fully improve the heating efficiency and make the heating speed faster. At the same time, by using the iron heating sheets 4 with slightly staggered through holes to form a spiral or bent air flow channel, the processing is simpler and the assembly is convenient.

[0022] In another embodiment of the hot air heater, please refer to Figure 6 , on the basis of the previous technical solution, specifically, a positioning protrusion extends circumferentially on the iron heating sheet 4, and a spiral or bent groove or notch is provided on the inner wall of the housing corresponding to the positioning protrusion. Thus, when assembling, the protrusion of each iron heating sheet 4 is placed into the groove or notch, so that the through holes of the iron heating sheets 4 form corresponding spiral or bent air flow channels. In other embodiments, a positioning groove extends circumferentially on the iron heating sheet, and a spiral or bent protrusion is provided on the inner wall of the housing corresponding to the positioning groove, which can also achieve the same purpose. Or by means of external auxiliary tools such as spiral or bent iron wires, etc., the purpose of rapid assembly can also be achieved.

[0023] In an embodiment of the hot air heater, please refer to Figures 2 to 3 , on the basis of the previous technical solution, specifically, a ceramic tube 5 is sleeved outside the stacked iron heating sheets 4, a fiberglass tube 6 is sleeved outside the steel cylinder 5, and the coil 4 is sleeved outside the fiberglass tube 6. The ceramic tube 5 is used to ensure that the stacked iron heating sheets 4 do not spread or deform. In its embodiment, the ceramic tube 5 can also be a protective tube such as a glass tube or a rigid plastic tube, and the fiberglass tube 6 is used for heat insulation and insulation.

[0024] In an embodiment of the hot air heater, please refer to Figures 2 to 3 , on the basis of the previous technical solution, specifically, a housing 3 is sleeved outside the coil 4, and a heat insulation sleeve 8 is hermetically arranged between the coil 4 and the housing 3 to prevent heat from being dissipated.

[0025] In an embodiment of the hot air heater, please refer to Figures 2 to 4, on the basis of the foregoing technical solution, it may specifically be that the inner empty length of the outer shell 3 is longer than that of the stacked iron heating sheets 4. A sealing sleeve 1 with an inner diameter smaller than that of the iron heating sheets 4 is arranged outside the air outlet of the stacked iron heating sheets 4. The outer diameter of the sealing sleeve 1 is the same as that of the heat insulation sleeve 8 and is snap-fitted into the outer shell 3. One function of the sealing sleeve 1 is to seal the gas to prevent the heated gas from leaking, and at the same time, a gas slow flow area is formed in the hollow of the sealing sleeve 1.

[0026] In an embodiment of the hot air heater, please refer to Figures 1 to 5 , on the basis of the foregoing technical solution, it may specifically be that a round copper sheet 2 with a diameter smaller than that of the iron heating sheets 4 is further arranged between the stacked iron heating sheets 4 and the sealing sleeve 1.

[0027] In an embodiment of the hot air heater, please refer to Figures 2 to 4 , on the basis of the foregoing technical solution, it may specifically be that the sealing sleeve 1 is provided with an annular groove corresponding to the round copper sheet 2, for example, part or all of the round copper sheet 2 is embedded in the sealing sleeve 1.

[0028] In an embodiment of the hot air heater, please refer to Figures 1 to 4 , on the basis of the foregoing technical solution, it may specifically be that the bottom of the outer shell 3 is provided with a bottom cover 9 with an air inlet.

[0029] The above is an elaboration of the hot air heater of the present invention to help understand the present invention. However, the implementation mode of the present invention is not limited by the above embodiments. Any changes, modifications, substitutions, combinations, and simplifications made without departing from the principle of the present invention shall be equivalent replacement methods and are all included in the protection scope of the present invention.

Claims

1. Hot air heater, characterized in that : It includes a shell, in which a plurality of identical iron heating plates with through holes are stacked. When adjacent iron heating plates are stacked, the through holes are slightly staggered, so that the corresponding small holes of each iron heating plate form a spiral or curved air flow channel. The outer periphery of the stacked iron heating plates is surrounded by an energized coil, and a high-frequency current with high-speed changes flows through the coil.

2. The hot air heater according to claim 1, characterized in that: The iron heating plate is provided with a positioning protrusion extending in the circumferential direction, and the inner wall of the shell is provided with a spiral or bent groove corresponding to the positioning protrusion.

3. The hot air heater according to claim 1, characterized in that: A positioning groove is extended circumferentially of the iron heating plate, and a spiral or bent protrusion is arranged on the inner wall of the shell corresponding to the positioning groove.

4. The hot air heater according to claim 1, characterized in that: The stacked iron heating plates are covered with a protective tube, the metal cylinder is covered with an insulating tube, and the coil is covered outside the insulating tube.

5. The hot air heater according to claim 4, characterized in that: The coil is covered with an outer shell, and a heat-insulating sleeve is sealed between the coil and the outer shell.

6. The hot air heater according to claim 5, characterized in that: The inner length of the shell is longer than the stacked iron heating plates, and a sealing sleeve with an inner diameter smaller than the iron heating plates is arranged outside the air outlet of the stacked iron heating plates. The outer diameter of the sealing sleeve is the same as that of the insulation sleeve and is matched and snapped into the shell.

7. The hot air heater according to claim 6, characterized in that: A round copper sheet with a diameter smaller than that of the iron heating sheet is also arranged between the stacked iron heating sheets and the sealing sleeve.

8. The hot air heater according to claim 7, characterized in that: The sealing sleeve is provided with an annular groove corresponding to the round copper sheet.

9. The hot air heater according to claim 1, characterized in that: A bottom cover with air holes is arranged at the bottom of the shell.

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