PTC heater

Abstract

The invention discloses a PTC heater, and belongs to the technical field of electric heating, the PTC heater comprises a heat conduction base and a plurality of heating grooves formed in the heat conduction base, and a PTC heating assembly is correspondingly clamped in each heating groove; the PTC heating assembly comprises an installation support and a PTC thermistor assembly, the installation support comprises a U-shaped structure, an installation groove with the top end open is formed in the U-shaped structure, the top end of one side wall of the U-shaped structure is bent to form a pressing elastic piece, an expansion notch is formed between the lower end of the pressing elastic piece and the side wall of the U-shaped structure, and after the lower end of the pressing elastic piece is pressed, the expansion notch is correspondingly shrunk. The PTC heating assembly and the mounting bracket can be connected in an insulating manner, a tight and large electric contact area is formed between the PTC thermistor element and the electrode plates on the two sides through press fitting of the pressing elastic pieces of the mounting bracket, it is ensured that heat generated by the PTC thermistor element is well dissipated, heat resistance is reduced through press fitting of the pressing elastic pieces, the heat conduction base and the electrode plates, and the service life of the PTC thermistor element is prolonged. And relatively high heat efficiency is realized.

Description

Technical Field

[0001] The invention relates to the technical field of electric heating, and in particular to a PTC heater. Background Art

[0002] The PTC heating device uses the heating characteristics of PTC to exchange heat with the medium. Usually, two conductors are added at both ends of the PTC thermistor element to form different electrodes at both ends to generate heat after power is applied. Then, sealants, powders and fixtures of different shapes are used to embed it into the shell that needs to be heated. Conventional sealing technology solutions for PTC heating devices, such as sealant potting, powder filling, and other special shapes, perform poorly in terms of heating efficiency, which in turn affects the heating capacity of the PTC heater. Summary of the invention

[0003] Technical problems to be solved: In view of the technical problems existing in the PTC heating device in the background technology, the present invention provides a PTC heater, which can improve its assembly efficiency and heat transfer performance.

[0004] Technical solution: A PTC heater described in the present invention comprises a heat-conducting base, a plurality of heating grooves are provided on the heat-conducting base, and a PTC heating component is correspondingly mounted in each heating groove; The PTC heating component includes a mounting bracket and a PTC thermistor component. The mounting bracket includes a U-shaped structure. A mounting groove with an open top is arranged in the U-shaped structure. The PTC thermistor component can be correspondingly mounted in the mounting groove. The top of one side wall of the U-shaped structure is bent to form a compression spring sheet. An expansion slot is formed between the lower end of the compression spring sheet and the side wall of the U-shaped structure, and the expansion slot is correspondingly reduced after the lower end of the compression spring sheet is compressed.

[0005] Preferably, the PTC heating component comprises: A PTC thermistor frame, wherein a mounting notch is provided in the PTC thermistor frame; A PTC thermistor element, wherein the PTC thermistor element is fixedly mounted in the mounting notch; The first electrode sheet and the second electrode sheet are respectively correspondingly attached to the large surfaces on both sides of the PTC thermistor frame, and are respectively closely attached to both sides of the PTC thermistor element; The thermally conductive silicone film is coated on the outer sides of the first electrode sheet and the second electrode sheet on both sides of the PTC thermistor frame.

[0006] Preferably, limit buckles are respectively provided on the two frame bodies on one side of the PTC thermistor frame; the area of ​​the first electrode sheet is smaller than the side area of ​​the PTC thermistor frame and larger than the area of ​​the installation slot, and connecting ear blocks for the limit buckles to be clamped are respectively provided on both sides of the first electrode sheet.

[0007] Preferably, a positioning column is provided on the frame body at one side of the PTC thermistor frame corresponding to the first electrode sheet, and a positioning hole is provided at a corresponding position of the first electrode sheet, and the positioning column can be correspondingly inserted into the positioning hole.

[0008] Preferably, a supporting bracket is correspondingly provided on the bottom frame of the PTC thermistor frame on the side corresponding to the first electrode sheet, and the lower end of the first electrode sheet can be correspondingly supported on the supporting bracket.

[0009] Preferably, the second electrode sheet is fixedly connected to a side of the PTC thermistor frame different from the first electrode sheet through a fixing member, and the area of ​​the second electrode sheet is smaller than the side area of ​​the PTC thermistor frame and larger than the area of ​​the installation notch.

[0010] Preferably, a first electrode ear block and a second electrode ear block are respectively disposed on the top of the first electrode sheet and the top of the second electrode sheet.

[0011] Compared with the prior art, the present invention has at least the following beneficial effects: The PTC heater of the present invention can realize the insulated connection between the PTC heating component and the mounting bracket, and the pressing of the clamping spring sheet of the mounting bracket enables the PTC thermistor element to form a close and large electrical contact area with the electrode sheets on both sides, ensuring good heat dissipation of the heat generated by the PTC thermistor element, and the pressing of the clamping spring sheet, the heat-conducting base and the electrode sheet reduces the thermal resistance, thereby achieving higher thermal efficiency.

[0012] The present invention also has other beneficial effects which are described in the embodiments of the specification and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the three-dimensional structure of the PTC heater of the present invention; Figure 2 for Figure 1 Schematic diagram of the three-dimensional structure of the PTC heating component; Figure 3 for Figure 2 Schematic diagram of the three-dimensional structure of the PTC thermistor component; Figure 4 for Figure 3 A schematic diagram of the three-dimensional structure of the first electrode sheet of the PTC thermistor frame; Figure 5 for Figure 4 A schematic diagram of the three-dimensional structure of the second electrode sheet of the PTC thermistor frame; Figure 6 for Figure 4 A schematic diagram of the structure of the PTC thermistor frame and the PTC thermistor therein from a first perspective; Figure 7 for Figure 6 A schematic diagram of the structure of the PTC thermistor frame and the PTC thermistor therein from a second perspective; Figure 8 for Figure 6 Schematic diagram of the three-dimensional structure of the PTC thermistor frame; Fig. 9 for Figure 2 A schematic diagram of the three-dimensional structure of the middle mounting bracket from the first perspective; Fig.10 for Fig. 9 Schematic diagram of the three-dimensional structure of the middle mounting bracket from the second perspective.

[0014] Figure numerals: 100, PTC heater; 1, thermal conductive base; 2, heating groove; 3, PTC heating assembly; 4, mounting bracket; 41, U-shaped structure; 42, mounting groove; 43, pressing spring; 44, expansion notch; 5, PTC thermistor assembly; 6, thermal conductive silicone film; 7, PTC thermistor frame; 71, limit buckle; 72, support bracket; 73, positioning column; 74, mounting notch; 8, first electrode sheet; 81, positioning hole; 82, first electrode ear block; 83, connecting ear block; 9, second electrode sheet; 91, fixing piece; 92, second electrode ear block; 10, PTC thermistor element. DETAILED DESCRIPTION

[0015] To make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the following will be combined with the attached Figures 1 to 10 The technical solutions of the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. All other embodiments obtained by ordinary technicians in this field based on the described embodiments of the present invention belong to the scope of protection of the present invention.

[0016] like Figure 1~2 and Figures 9 and 10 As shown, a PTC heater according to an embodiment of the present invention, the PTC heater 100 includes a heat-conducting base 1, and a plurality of heating slots 2 are provided on the heat-conducting base 1, and a PTC heating component 3 is correspondingly mounted in each heating slot 2. The PTC heating component 3 includes a mounting bracket 4 and a PTC thermistor component 5, and the mounting bracket 4 includes a U-shaped structure 41, and a mounting slot 42 with an open top is provided in the U-shaped structure 41, and the PTC thermistor component 5 can be correspondingly mounted in the mounting slot 42; the top of one side wall of the U-shaped structure 41 is bent to form a compression spring sheet 43, and an expansion slot 44 is formed between the lower end of the compression spring sheet 43 and the side wall of the U-shaped structure 41, and the expansion slot 44 is correspondingly reduced after the lower end of the compression spring sheet 43 is compressed. The pressing of the compression spring sheet 43 of the mounting bracket 4 of the present invention allows the PTC heating component 3 to be tightly mounted in the heating slot 2 of the heat-conducting base 1.

[0017] like Figure 3 As shown, the PTC heating component 3 includes a PTC thermistor frame 7, a PTC thermistor element 10, a first electrode sheet 8, a second electrode sheet 9 and a thermally conductive silicone film 6. A mounting notch 74 is provided in the PTC thermistor frame 7, and the PTC thermistor element 10 is fixedly mounted in the mounting notch 74. The first electrode sheet 8 and the second electrode sheet 9 are respectively correspondingly attached to the large surfaces on both sides of the PTC thermistor frame 7, and are respectively tightly attached to both sides of the PTC thermistor element 10; the thermally conductive silicone film 6 is correspondingly coated on the outside of the first electrode sheet 8 and the second electrode sheet 9 on both sides of the PTC thermistor frame 7. The PTC heater of the present invention can realize the insulated connection between the PTC heating component 3 and the mounting bracket 4, and the pressing of the pressing spring sheet 43 of the mounting bracket 4 enables the PTC thermistor element 10 to form a close and large electrical contact area with the electrode sheets on both sides, ensuring that the heat generated by the PTC thermistor element 10 is well dissipated, and the pressing of the pressing spring sheet 43, the thermal conductive base 1 and the electrode sheet reduces the thermal resistance, achieving a higher thermal efficiency.

[0018] like Figure 4 and Figure 6-7 As shown, limit buckles 71 are respectively provided on the two frame bodies on one side of the PTC thermistor frame 7; the area of ​​the first electrode sheet 8 is smaller than the side area of ​​the PTC thermistor frame 7 and larger than the area of ​​the mounting slot 74, and connecting ear blocks 83 for the limit buckles 71 to be engaged are respectively provided on both sides of the first electrode sheet 8, and the first electrode sheet 8 is fixedly connected to the PTC thermistor frame 7 through the limit buckle 71 and the connecting ear block 83.

[0019] like Figure 8 As shown, a positioning column 73 is provided on the frame body of the PTC thermistor frame 7 on the side corresponding to the first electrode sheet 8, and a positioning hole 81 is provided at the corresponding position of the first electrode sheet 8, and the positioning column 73 can be correspondingly inserted into the positioning hole 81. When the first electrode sheet 8 is docked with the PTC thermistor frame 7, the positioning column 73 and the positioning hole 81 are firstly used for preliminary positioning, so as to facilitate the fixed connection between the limit buckle 71 and the connecting ear block 83. A support bracket 72 is correspondingly provided on the bottom frame body of the PTC thermistor frame 7 on the side corresponding to the first electrode sheet 8, and the lower end of the first electrode sheet 8 can be correspondingly supported on the support bracket 72. When the first electrode sheet 8 is installed, the lower end of the first electrode sheet 8 is firstly clamped on the support bracket 72, and then the positioning hole 81 of the first electrode sheet 8 is correspondingly clamped on the positioning column 73, and finally the limit buckle 71 is correspondingly buckled on the connecting ear block 83, that is, the fixed connection between the first electrode sheet 8 and the PTC thermistor frame 7 is realized.

[0020] like Figure 5As shown, the second electrode sheet 9 is fixedly connected to the side of the PTC thermistor frame 7 different from the first electrode sheet 8 by a fixing member 91, and the area of ​​the second electrode sheet 9 is smaller than the side area of ​​the PTC thermistor frame 7 and larger than the area of ​​the mounting slot 74. Under normal conditions, the second electrode sheet 9 is connected to the PTC thermistor frame 7 in a fixed manner, and the first electrode sheet 8 is connected to the PTC thermistor frame 7 in a detachable manner, so as to facilitate the assembly of the PTC thermistor element 10.

[0021] like Figures 3-5 As shown, a first electrode lug block 82 and a second electrode lug block 92 are respectively disposed at the top of the first electrode sheet 8 and the top of the second electrode sheet 9 .

[0022] The above are preferred embodiments of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. A PTC heater, characterized in that: The PTC heater (100) comprises a heat-conducting base (1), wherein a plurality of heating grooves (2) are provided on the heat-conducting base (1), and a PTC heating component (3) is correspondingly mounted in each heating groove (2); The PTC heating component (3) comprises a mounting bracket (4) and a PTC thermistor component (5); the mounting bracket (4) comprises a U-shaped structure (41); a mounting groove (42) with an open top is provided in the U-shaped structure (41); the PTC thermistor component (5) can be correspondingly mounted in the mounting groove (42); a top end of a side wall of the U-shaped structure (41) is bent to form a compression spring sheet (43); an expansion notch (44) is formed between the lower end of the compression spring sheet (43) and the side wall of the U-shaped structure (41); and the expansion notch (44) is correspondingly reduced when the lower end of the compression spring sheet (43) is compressed.

2. The PTC heater according to claim 1, characterized in that: The PTC heating component (3) comprises: A PTC thermistor frame (7), wherein a mounting notch (74) is provided in the PTC thermistor frame (7); A PTC thermistor element (10), wherein the PTC thermistor element (10) is fixedly mounted in the mounting notch (74); The first electrode sheet (8) and the second electrode sheet (9) are respectively and correspondingly attached to the large surfaces on both sides of the PTC thermistor frame (7), and are respectively and closely attached to both sides of the PTC thermistor element (10); A heat-conductive silicone film (6), the heat-conductive silicone film (6) correspondingly covering the outside of the first electrode sheet (8) and the second electrode sheet (9) on both sides of the PTC thermistor frame (7).

3. The PTC heater according to claim 2, characterized in that: Limiting buckles (71) are respectively provided on two frame bodies on one side of the PTC thermistor frame (7); the area of ​​the first electrode sheet (8) is smaller than the side area of ​​the PTC thermistor frame (7) and larger than the area of ​​the mounting notch (74), and connecting ear blocks (83) for the limiting buckles (71) to be clamped are respectively provided on both sides of the first electrode sheet (8).

4. The PTC heater according to claim 3, characterized in that: A positioning column (73) is provided on the frame body on the side corresponding to the first electrode sheet (8) of the PTC thermistor frame (7), and a positioning hole (81) is provided at a corresponding position of the first electrode sheet (8), and the positioning column (73) can be correspondingly inserted into the positioning hole (81).

5. The PTC heater according to claim 4, characterized in that: A supporting bracket (72) is correspondingly arranged on the bottom frame of the PTC thermistor frame (7) on the side corresponding to the first electrode sheet (8), and the lower end of the first electrode sheet (8) can be correspondingly supported on the supporting bracket (72).

6. The PTC heater according to claim 2, characterized in that: The second electrode sheet (9) is fixedly connected to a side of the PTC thermistor frame (7) different from the first electrode sheet (8) via a fixing member (91), and the area of ​​the second electrode sheet (9) is smaller than the side area of ​​the PTC thermistor frame (7) and larger than the area of ​​the installation notch (74).

7. The PTC heater according to claim 6, characterized in that: A first electrode ear block (82) and a second electrode ear block (92) are respectively arranged at the top of the first electrode sheet (8) and the second electrode sheet (9).

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