Core structure of PTC heater

Abstract

The utility model discloses a core structure of a PTC heater. The PTC heater comprises an aluminum tube and a heating core body inserted in the aluminum tube, the heating core body comprises PTC heating elements arranged in the center and electrode strips located on the upper sides and the lower sides of the PTC heating elements, the outer surfaces of the electrode strips are coated with insulating films, and aluminum oxide substrates are arranged between the upper faces and the lower faces of the insulating films and the inner wall of the aluminum tube in a lining mode. Inward limiting ribs are arranged on the top faces and / or the bottom faces of the two sides of the inner wall of the aluminum pipe in the width direction to limit the two side faces of the heating core body. The utility model has the advantages that the limiting ribs on the inner wall of the aluminum tube are matched with the corners of the heating core, so that the vertical position of the heating core in the aluminum tube can be effectively limited, the problem of position deviation of the heating element caused by different specifications of ceramic chips is avoided, and the mounting precision of the heating core is ensured.

Description

Technical Field

[0001] This utility model relates to the field of PTC heating technology, and in particular to a core structure of a PTC heater. Background Technology

[0002] PTC (Positive Temperature Coefficient) heaters are widely used in home appliances, automobiles, and industrial equipment due to their stable heating and high safety. Existing PTC heater core structures typically generate heat through a heating element, which is then conducted through an aluminum tube and an alumina substrate to achieve efficient heat dissipation and stable operation. When different sizes of ceramic plates are used inside the heating core, the inconsistent height of the ceramic plates makes it impossible to fix the vertical position of the heating element within the aluminum tube. During the pressing process, the heating core is prone to varying degrees of vertical misalignment, leading to electrode strip displacement. This displacement not only fails to meet the tolerance requirements for the electrode strips to be on the same plane but may also result in insufficient creepage distance, increasing the risk of short circuits and failures, severely impacting product safety and reliability. Furthermore, existing technologies also employ designs that limit the PTC heater core by deforming the aluminum shell sidewalls inward. However, this material deformation-based limiting method is difficult to precisely control, often resulting in poor conduction and further affecting product performance. Simultaneously, such structures place high demands on the heating core manufacturing process, increasing production difficulty and cost, and hindering cost reduction and efficiency improvements. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to provide a core structure for a PTC heater that is low in cost, has precise positioning, and is structurally reliable.

[0004] To solve the above-mentioned technical problems, the core structure of the PTC heater of this utility model includes an aluminum tube and a heating core inserted inside the aluminum tube. The heating core includes a PTC heating element arranged in the center and electrode strips located on the upper and lower sides of the PTC heating element. The outer surface of the electrode strips is covered with an insulating film. The top and / or bottom surfaces of the inner wall of the aluminum tube along the width direction are provided with inward limiting ribs to limit the two sides of the heating core.

[0005] An aluminum oxide substrate is placed between the upper and lower surfaces of the insulating film and the inner wall of the aluminum tube.

[0006] The upper and lower surfaces of the PTC heating element are respectively bonded to the corresponding electrode strips with adhesive.

[0007] The insulating film is made of polyimide.

[0008] The aluminum tube's two side walls bend inwards in the width direction to form a concave structure.

[0009] The number of limiting ribs is four, which are respectively matched with the corners of the heating core for limiting.

[0010] Advantages of this utility model:

[0011] (1) The limiting ribs on the inner wall of the aluminum tube are matched with the corners of the heating core, which can effectively limit the vertical position of the heating core in the aluminum tube, avoid the problem of the heating element position shift caused by different ceramic sheet specifications, and ensure the installation accuracy of the heating core.

[0012] (2) The design of the limiting rib ensures the vertical symmetry of the heating core in the aluminum tube, thereby avoiding the offset phenomenon caused by the skewed position of the electrode strip, meeting the tolerance requirements of the electrode strip in the same plane, and improving the consistency and reliability of the product.

[0013] (3) The alumina substrate and polyimide insulating film used in this utility model, together with the design of the limiting ribs, further enhance the structural strength and durability of the heating core, ensuring the stable performance of the heater in long-term use. Attached Figure Description

[0014] Figure 1 This is a cross-sectional view of the core structure of the PTC heater of this utility model;

[0015] Figure 2 This is a structural diagram of the core structure of the PTC heater of this utility model;

[0016] Figure 3 This is a structural diagram of the core structure of the PTC heater of this utility model. Detailed Implementation

[0017] The core structure of the PTC heater of this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. Example

[0018] The core structure of the PTC heater includes an aluminum tube 1 and a heating core 2 inserted inside the aluminum tube 1. The heating core 2 includes a PTC heating element 3 arranged in the center, a ceramic plate, and electrode strips 5 located on the upper and lower sides of the PTC heating element 3. The upper and lower surfaces of the PTC heating element 3 are respectively bonded to the corresponding electrode strips 5 by adhesive 7. The outer surface of the electrode strips 5 is covered with an insulating film 8, the material of which is polyimide. An aluminum oxide substrate 6 is placed between the upper and lower surfaces of the insulating film 8 and the aluminum tube 1. The inner wall of the aluminum tube 1 has inward limiting ribs 9 on the top and / or bottom surfaces on both sides along the width direction. The limiting ribs 9 cooperate with the corners of the heating core 2 to limit the two sides of the heating core 2. The two side walls of the aluminum tube 1 are bent inward in the width direction to form a concave structure, which further improves stability.

Claims

1. A core structure for a PTC heater, characterized in that: The device includes an aluminum tube (1) and a heating core (2) inserted inside the aluminum tube (1). The heating core (2) includes a PTC heating element (3) arranged in the center and electrode strips (5) located on the upper and lower sides of the PTC heating element (3). The outer surface of the electrode strips (5) is covered with an insulating film (8). The top and / or bottom surfaces of the inner wall of the aluminum tube (1) along the width direction are provided with inward limiting ribs (9) to limit the two sides of the heating core (2).

2. The core structure of the PTC heater according to claim 1, characterized in that: An aluminum oxide substrate (6) is placed between the upper and lower surfaces of the insulating film (8) and the inner wall of the aluminum tube.

3. The core structure of the PTC heater according to claim 2, characterized in that: The upper and lower surfaces of the PTC heating element (3) are respectively bonded to the corresponding electrode strips (5) by adhesive (7).

4. The core structure of the PTC heater according to claim 3, characterized in that: The insulating film (8) is made of polyimide.

5. The core structure of the PTC heater according to claim 4, characterized in that: The aluminum tube (1) has its two side walls bent inward in the width direction to form a concave structure.

6. The core structure of the PTC heater according to claim 5, characterized in that: The number of limiting ribs (9) is four, which are respectively matched with the corners of the heating core (2) for limiting.

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