Low-abnormal-sound PTC heating core

Abstract

The utility model discloses a PTC (Positive Temperature Coefficient) heating core with low abnormal sound. The heating device comprises a heating core, an insulating film wrapping the periphery of the heating core and an aluminum pipe allowing the heating core to penetrate through. And the insulating film is a film which has a self-adhesion characteristic and wraps the periphery of the heating core by at least two layers. The insulating film wraps the periphery of the heating core in a mode that the whole sheet is wound layer by layer, and the tail end of the insulating film adheres to the lap joint part of the previous layer of film by means of the self-adhesion characteristic. The heating core is wrapped by three layers of insulating films, and the heating core is wrapped by two layers of insulating films. The insulating film is an FHF type polyimide composite film. The PTC heater has the advantages that the FHF type polyimide composite film has high peel strength and high-temperature self-adhesion, can work at high temperature, is attached to the heating core more tightly, and cannot vibrate in the aluminum pipe or collide with the inner side wall of the aluminum pipe due to thermal expansion, so that abnormal sound generated when the PTC heater is used is greatly reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a PTC heater, concretely to a low abnormal sound PTC heating core. BACKGROUND

[0002] At present, in the industry, the inside of wind warm PTC mostly adopts H type polyimide film to coat the heating core to play the pressure resistance and insulation effect, however, due to the surface of H type polyimide film being relatively smooth, it will slide back before being pressed into the aluminum pipe and contact with the lateral wall of the aluminum pipe. After being pressed tightly from the upper and lower flat surfaces of the aluminum pipe, the H type polyimide film side is extruded and will be opened outward to partially contact with the lateral wall of the aluminum pipe, and the H type polyimide film will be in a floating state all the time.

[0003] In the actual use process of the user, due to the difference in the design of air conditioning boxes of different vehicle factories and the difference in the heat management control logic, the problem that the PTC heater is in a full power state when the user operates the air conditioning panel to make the air conditioning fan be in a low air volume may occur. At this time, due to the slow heat exchange of the PTC heater, the heat inside the heating core will be relatively high, the temperature rises rapidly, the temperature inside the aluminum pipe rises sharply, the H type polyimide film is impacted by high temperature and starts to expand and vibrate rapidly, which causes the repeated collision of the two layers of films or the collision of the film side and the lateral wall of the aluminum pipe, thereby abnormal sound is generated, which is easy to cause the user's repulsion in the quiet vehicle environment. SUMMARY

[0004] The utility model wants to solve the technical problem to provide a low abnormal sound PTC heating core.

[0005] In order to solve the above technical problem, the low abnormal sound PTC heating core of the utility model, including the heating core, the insulating film wrapped in the periphery of the heating core and the aluminum pipe for the heating core to penetrate, the insulating film is the film wrapped in the periphery of the heating core with at least two layers with self-adhesion characteristics.

[0006] The insulating film is wrapped in the periphery of the heating core in the way of whole sheet material winding layer by layer, and the end and the lap joint part of the previous layer of film are adhered by means of the self-adhesion characteristics.

[0007] The insulating film is wrapped three layers above the heating core and two layers below the heating core.

[0008] The insulating film is FHF type polyimide composite film.

[0009] The utility model has the advantages that FHF type polyimide composite film has high peel strength and high temperature self-adhesion, can work at high temperature and fit the heating core more tightly, and will not vibrate in the aluminum pipe or collide with the inner lateral wall of the aluminum pipe due to thermal expansion, thereby greatly reducing the abnormal sound of the PTC heater in use. BRIEF DESCRIPTION OF DRAWINGS

[0010] Figure 1 Uncompressed state schematic diagram before the film of the utility model is replaced;

[0011] Figure 2 Compressed state schematic diagram before the film of the utility model is replaced;

[0012] Figure 3 Uncompressed state schematic diagram after the film of the utility model is replaced;

[0013] Figure 4 Compressed state schematic diagram after the film of the utility model is replaced;

[0014] Figure 5 Compressed state schematic diagram after the film of the utility model is replaced. DETAILED DESCRIPTION

[0015] The low-noise PTC heating core of the utility model will be further explained in detail below in combination with the drawings and specific embodiments.

[0016] As shown in the drawings, the low-noise PTC heating core of the utility model comprises a heating core 3, an insulating film 2 wrapped around the periphery of the heating core 3, and an aluminum pipe 1 for the heating core 3 to pass through; the insulating film 2 is an FHF type polyimide composite film with self-adhesive properties, which is wrapped around the periphery of the heating core 3 in the form of a whole sheet of material wound layer by layer, and the end of the film is bonded to the overlapping part of the previous layer of film by means of the self-adhesive properties.

[0017] In actual use, in order to ensure the wrapping of at least two layers and the tightness of the wrapping, the heating core 3 is taken as the starting point of the wrapping, two turns are wrapped around the heating core 3, and then half a turn is wrapped above the heating core 3, and then the aluminum pipe 1 is passed through for compression, so that the final insulating film 2 is wrapped three layers above the heating core 3 and two layers below the heating core 3.

[0018] Of course, the above description is not a limitation of the utility model, and the utility model is not limited to the above examples, and changes, modifications, additions or replacements made by the skilled in the art within the essential scope of the utility model should also be within the protection scope of the utility model.

Claims

1. A low-noise PTC heating element, comprising a heating element (3), an insulating film (2) wrapped around the heating element (3), and an aluminum tube (1) through which the heating element (3) passes, characterized in that: The insulating film (2) is a thin film with self-adhesive properties, which is wrapped around the heating core (3) in at least two layers.

2. The low-noise PTC heating element according to claim 1, characterized in that: The insulating film (2) is wrapped around the heating core (3) in a layer-by-layer manner, and its end is bonded to the previous film layer by means of self-adhesive properties.

3. The low-noise PTC heating element according to claim 2, characterized in that: The insulating film (2) is wrapped in three layers above the heating core (3) and in two layers below the heating core (3).

4. The low-noise PTC heating element according to claim 1, 2 or 3, characterized in that: The insulating film (2) is an FHF type polyimide composite film.

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