Surface-charged low-voltage PTC heater structure

Abstract

The utility model discloses a low-voltage PTC heater structure with a charged surface. The PTC heater comprises an electrode plate, a PTC plate, a ceramic plate and an aluminum tube, the electrode plate is coated in a plastic material to form an electrode plastic-coated part, one side surface of the electrode plastic-coated part is provided with a PTC plate placing groove for placing the PTC plate, and the other side surface of the electrode plastic-coated part is provided with a ceramic plate placing groove for placing the ceramic plate. PTC sheets are arranged in the PTC sheet accommodating grooves, ceramic sheets are arranged in the ceramic sheet accommodating grooves and then are connected in the aluminum pipe in a penetrating manner to form single PTC heating assemblies, and radiating fins are arranged on the outer surfaces of the PTC heating assemblies to form a PTC heater structure. The method has the advantages that the electrode plates cannot deviate, deform and the like in the injection molding process, and the effective creepage distance between a subsequent positive electrode and a subsequent negative electrode is guaranteed; and the distances of the electrode plates of the heating core assemblies exposed out of the aluminum pipe are consistent, so that the repeated contact of the PTC sheets and the aluminum pipe is ensured, and the bad problems of arcing, ablation and the like are effectively prevented.

Description

Technical Field

[0001] The utility model relates to a PTC heater structure, in particular to a surface-charged low-voltage PTC heater structure, belonging to the technical field of heaters. Background Art

[0002] Unlike traditional fuel vehicles, new energy vehicles require independent heaters for battery panel heating, air conditioning and heating systems. PTC (Positive Temperature Coefficient) is a positive temperature coefficient semiconductor material. When the temperature reaches near the Curie temperature of the PTC element, its resistivity increases rapidly. PTC heaters have the characteristics of fast start-up speed, high thermal efficiency, good temperature control, safety without open flames, ideal working reliability, energy saving and long service life. PTC has been widely used as a safe electric heating product and is a relatively ideal electric heating material.

[0003] However, in some northern or cold regions, due to the low outdoor temperature in winter, the heating power requirement of automobile air conditioners is relatively high. Existing PTC heaters use water heating or air heating with a voltage of more than 300VDC for heating, with a power ranging from 2000W to 5000W. The high power of the heater leads to a significant decrease in the vehicle's endurance. At present, heat pumps and low-voltage PTC auxiliary heating are mainly used to reduce vehicle electricity consumption. However, not only is the product cost high, but its unreasonable structural design easily causes deformation of the electrode sheet and a small creepage distance, and is also prone to arcing, ablation and other problems. Summary of the invention

[0004] The technical problem to be solved by the utility model is to provide a surface charged low-voltage PTC heater structure with a simple structure, low manufacturing cost and the ability to effectively prevent adverse problems such as arcing and ablation.

[0005] In order to solve the above technical problems, the utility model discloses a surface-charged low-voltage PTC heater structure, comprising an electrode sheet, a PTC sheet, a ceramic sheet and an aluminum tube. The electrode sheet is plastic-coated in a plastic material to form an electrode plastic-coated part. A PTC sheet placement groove for placing the PTC sheet is provided on one side surface of the electrode plastic-coated part. A ceramic sheet placement groove for placing the ceramic sheet is provided on the other side surface of the electrode plastic-coated part. The PTC sheet is placed in the PTC sheet placement groove and the ceramic sheet is placed in the ceramic sheet placement groove and then connected to the aluminum tube to form a single PTC heating component. The outer surface of each of the PTC heating components is provided with a heat dissipation fin to form a PTC heater structure.

[0006] The tail of the electrode plastic package is provided with a limiting step matched with the aluminum tube.

[0007] The depth of the PTC sheet placement groove is less than the thickness of the PTC sheet and enables the PTC sheet to contact the aluminum tube.

[0008] A conductive terminal is riveted on the head of the electrode overmolded component.

[0009] The surface of the electrode sheet is tin-plated and is integrally formed with plastic by injection molding, thereby forming the electrode plastic package.

[0010] The electrode plastic package has a plurality of positioning holes for positioning the electrode sheets.

[0011] The PTC sheet placement groove is coated with glue for bonding the PTC sheet to the electrode.

[0012] The advantages of the utility model are:

[0013] By encapsulating the electrode sheet in a plastic material to form an electrode overmolded part and providing positioning holes on the electrode overmolded part, the electrode sheet will not be offset or deformed during the injection molding process, thereby ensuring the effective creepage distance between the subsequent positive and negative electrodes; a limiting step that cooperates with the aluminum tube is provided at the tail of the electrode overmolded part to ensure that the distance between the electrode sheet of each heating core assembly exposed from the aluminum tube is consistent when the tube is inserted; furthermore, the PTC sheet protrudes from the surface of the electrode overmolded part, thereby ensuring repeated contact between the PTC sheet and the aluminum tube, effectively preventing arcing, ablation and other adverse problems; in addition, the PTC sheet placement groove is coated with glue for bonding the PTC sheet to the electrode, so that the PTC electrode surface is well bonded to the electrode in the electrode overmolded part. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a schematic diagram of the structure of the surface charged low-voltage PTC heater of the utility model;

[0015] Figure 2 This is a schematic diagram of the overall structure of a single PTC heating component in the utility model;

[0016] Figure 3 It is a schematic diagram of the exploded structure of a single PTC heating component in the utility model. DETAILED DESCRIPTION

[0017] The surface charged low-voltage PTC heater structure of the utility model is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0018] As shown in the figure, the surface charged low-voltage PTC heater structure of the utility model includes an electrode sheet 1, a PTC sheet 2, a ceramic sheet 3 and an aluminum tube 4. The electrode sheet 1 is plastic-coated in a plastic material to form an electrode plastic-coated part 5. In this embodiment, the surface of the electrode sheet 1 is tin-plated and is integrally formed with the plastic by injection molding to form an electrode plastic-coated part. During production, the electrode plastic-coated part places the stamped electrode sheet (surface tin-plated) in an injection mold, and the electrode and the plastic are integrally injection-molded by injection molding to form a whole. A plurality of PTC sheet placement grooves 6 for accommodating PTC sheets are provided on one side surface of the electrode plastic-coated part 5, and a ceramic sheet placement groove for accommodating ceramic sheets is provided on the other side surface of the electrode plastic-coated part 5. Each PTC sheet is respectively placed in a different PTC sheet placement groove 6, and each ceramic sheet They are respectively placed in different ceramic sheet placement grooves, the PTC sheet 2 is placed in the PTC sheet placement groove, and the ceramic sheet 3 is placed in the ceramic sheet placement groove, and then connected in the aluminum tube to form a single PTC heating component 8. During assembly, the PTC sheet is placed in the PTC sheet placement groove 6 of the electrode package according to a certain arrangement; the ceramic sheet is placed in the ceramic sheet placement groove on the other side of the electrode package; the aluminum tube is passed through the tube from the head and pressed against the limiting step behind the electrode package for limiting; the head of the electrode package 5 is riveted with a conductive terminal 10, that is, the head of the electrode package matches the terminal, and the conductive terminal is crimped together with the electrode sheet of the electrode package by riveting; the outer surfaces of multiple different PTC heating components 8 are provided with heat dissipation fins and combined to form a PTC heater structure (such as Figure 3 as shown).

[0019] Furthermore, the tail of the electrode overmolded part 5 is provided with a limiting step 9 which cooperates with the aluminum tube. After the PTC sheet 2 is placed in the PTC sheet placement groove and the ceramic sheet 3 is placed in the ceramic sheet placement groove and then connected to the aluminum tube, the limiting step 9 is limited on the rear end surface of the aluminum tube.

[0020] Furthermore, the depth of the PTC sheet placement groove 6 is less than the thickness of the PTC sheet 2 and enables the PTC sheet to contact the aluminum tube.

[0021] Furthermore, the electrode overmolded part 5 is provided with a plurality of positioning holes 11 for positioning the electrode sheet, and the PTC sheet placement groove 6 is coated with glue for bonding the PTC sheet to the electrode, thereby the PTC sheet placement groove 6 in the electrode overmolded part is evenly coated with glue, so that the electrode surface of the PTC is well bonded with the electrode sheet in the electrode overmolded part.

[0022] Among them, the surface charged low-voltage PTC heater structure of the utility model adopts a connector form for the heating power supply, which is connected to the 12V power supply of the whole vehicle.

[0023] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention should also fall within the protection scope of the present invention.

Claims

1. A surface charged low-voltage PTC heater structure, comprising an electrode sheet (1), a PTC sheet (2), a ceramic sheet (3) and an aluminum tube (4), characterized in that: The electrode sheet (1) is molded in a plastic material to form an electrode molded part (5); a PTC sheet placement groove (6) for placing a PTC sheet is provided on one side surface of the electrode molded part (5); a ceramic sheet placement groove for placing a ceramic sheet is provided on the other side surface of the electrode molded part (5); the PTC sheet (2) is placed in the PTC sheet placement groove and the ceramic sheet (3) is placed in the ceramic sheet placement groove and then connected to the aluminum tube to form a single PTC heating component (8); and the outer surface of each of the PTC heating components (8) is provided with a heat dissipation fin to form a PTC heater structure (12).

2. The surface charged low voltage PTC heater structure according to claim 1, characterized in that: The tail of the electrode overmolded component (5) is provided with a limiting step (9) that cooperates with the aluminum tube.

3. The surface charged low voltage PTC heater structure according to claim 1 or 2, characterized in that: The depth of the PTC sheet placement groove (6) is less than the thickness of the PTC sheet (2) and enables the PTC sheet to contact the aluminum tube.

4. The surface charged low voltage PTC heater structure according to claim 3, characterized in that: A conductive terminal (10) is riveted to the head of the electrode overmolded component (5).

5. The surface charged low voltage PTC heater structure according to claim 1, 2 or 4, characterized in that: The surface of the electrode sheet (1) is tin-plated and is integrally formed with plastic by injection molding, thereby forming the electrode plastic package.

6. The surface charged low voltage PTC heater structure according to claim 5, characterized in that: The electrode overmolded component (5) is provided with a plurality of positioning holes (11) for positioning the electrode sheet.

7. The surface charged low voltage PTC heater structure according to claim 6, characterized in that: The PTC sheet placement groove (6) is coated with glue for bonding the PTC sheet to the electrode.

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