PTC heater

Abstract

The utility model discloses a PTC (Positive Temperature Coefficient) heater, which belongs to the technical field of electric heating and comprises a heat conducting base and a plurality of heating grooves arranged on the heat conducting base, and a PTC heating component 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. According to the utility model, 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 the press fitting of the pressing elastic sheet of the mounting bracket, the heat generated by the PTC thermistor element is well dissipated, the heat resistance is reduced through the press fitting of the pressing elastic sheet, 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 utility model relates to electric heating technical field especially relates to a PTC heater. BACKGROUND

[0002] The PTC heating device utilizes the PTC current heating characteristic and the medium to carry out heat exchange, usually adopts two blocks of conductors to increase the two ends of PTC thermistor element to make the two ends form different electrodes to heat after electrification, secondly adopts sealing glue, powder and different shape fixing device to embed it in the shell that needs to heat. The sealing technical scheme of conventional PTC heating device such as sealing glue pouring, powder filling, other special shape etc. is not good in heating efficiency, and further influences the heating capacity of PTC heater. UTILITY MODEL CONTENT

[0003] The technical problem solved: for the technical problems existing in the PTC heating device in the background art, the utility model provides a PTC heater, which can improve the assembly efficiency and heat transfer performance.

[0004] Technical scheme: the PTC heater, the PTC heater includes a heat-conducting base, a plurality of heating grooves are formed on the heat-conducting base, and a PTC heating assembly is correspondingly clamped in each heating groove.

[0005] The PTC heating assembly includes a mounting bracket and a PTC thermistor assembly, the mounting bracket includes a U-shaped structure, an installation groove with an open top end is arranged in the U-shaped structure, and the PTC thermistor assembly can be correspondingly clamped in the installation groove; the top end of the side wall of the U-shaped structure is bent to form a compression spring, the lower end of the compression spring and the side wall of the U-shaped structure form an expansion slot, and the expansion slot correspondingly shrinks after the lower end of the compression spring is compressed.

[0006] Preferably, the PTC heating assembly includes:

[0007] A PTC thermistor frame is arranged in the PTC thermistor frame.

[0008] A PTC thermistor element is fixedly clamped in the installation slot.

[0009] The first electrode sheet and the second electrode sheet are respectively attached to the two sides of the PTC thermistor frame, and are respectively and closely attached to the two sides of the PTC thermistor element.

[0010] A heat-conducting silica gel film is correspondingly wrapped outside the first electrode sheet and the second electrode sheet on the two sides of the PTC thermistor frame.

[0011] Preferably, limit buckles are provided on both sides of the PTC thermistor frame; the area of ​​the first electrode sheet is smaller than the side area of ​​the PTC thermistor frame but larger than the area of ​​the mounting slot, and connecting lugs for the limit buckles to engage are provided on both sides of the first electrode sheet.

[0012] Preferably, the PTC thermistor frame has a positioning post on the side of the frame corresponding to the first electrode sheet, and the first electrode sheet has a positioning hole at the corresponding position, so that the positioning post can be inserted into the positioning hole.

[0013] Preferably, a support bracket is 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 supported on the support bracket.

[0014] Preferably, the second electrode sheet is fixedly connected to the PTC thermistor frame on one side, different from the first electrode sheet, by a fixing member, and the area of ​​the second electrode sheet is smaller than the side area of ​​the PTC thermistor frame but larger than the area of ​​the mounting slot.

[0015] Preferably, the top ends of the first electrode sheet and the second electrode sheet are respectively provided with a first electrode lug and a second electrode lug.

[0016] Compared with the prior art, the present invention has at least the following beneficial effects:

[0017] The PTC heater of this utility model can achieve an insulated connection between the PTC heating component and the mounting bracket. The pressing of the clamping spring of the mounting bracket makes the PTC thermistor element and the electrode plates on both sides form a close and large electrical contact area, ensuring good heat dissipation of the heat generated by the PTC thermistor element. The pressing of the clamping spring with the heat-conducting base and the electrode plates reduces thermal resistance and achieves high thermal efficiency.

[0018] This invention also has other beneficial effects, which are described in the embodiments section of the specification and will not be repeated here. Attached Figure Description

[0019] Figure 1 This is a three-dimensional structural diagram of the PTC heater of this utility model;

[0020] Figure 2 for Figure 1 A three-dimensional structural diagram of the PTC heating assembly;

[0021] Figure 3 for Figure 2 Schematic diagram of the three-dimensional structure of the PTC thermistor assembly;

[0022] Figure 4 for Figure 3 A three-dimensional schematic diagram of the first electrode sheet of the PTC thermistor frame;

[0023] Figure 5 For Figure 4 The second electrode sheet of the PTC thermistor frame is shown in the perspective view.

[0024] Figure 6 For Figure 4 The first perspective view of the PTC thermistor frame and the PTC thermistor in the PTC thermistor frame is shown.

[0025] Figure 7 For Figure 6 The second perspective view of the PTC thermistor frame and the PTC thermistor in the PTC thermistor frame is shown.

[0026] Figure 8 For Figure 6 The perspective view of the PTC thermistor frame is shown.

[0027] Figure 9 For Figure 2 The first perspective view of the mounting bracket is shown.

[0028] Figure 10 For Figure 9 The second perspective view of the mounting bracket is shown.

[0029] The figure mark: 100, PTC heater; 1, heat-conducting base; 2, heating groove; 3, PTC heating assembly; 4, mounting bracket; 41, U-shaped structure; 42, mounting groove; 43, compression spring; 44, expansion notch; 5, PTC thermistor assembly; 6, heat-conducting silica gel film; 7, PTC thermistor frame; 71, limiting buckle; 72, supporting bracket; 73, positioning column; 74, mounting notch; 8, first electrode sheet; 81, positioning hole; 82, first electrode lug block; 83, connecting lug block; 9, second electrode sheet; 91, fixing piece; 92, second electrode lug block; 10, PTC thermistor element. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the following will combine the attached drawings to clearly and completely describe the technical scheme of the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the described embodiments of the present application, all other embodiments obtained by those skilled in the art belong to the scope of protection of the present application. Figures 1-10 In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the following will combine the attached drawings to clearly and completely describe the technical scheme of the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the described embodiments of the present application, all other embodiments obtained by those skilled in the art belong to the scope of protection of the present application.

[0031] As Figures 1-2 and Figures 9-10As shown, the PTC heater 100 includes a heat-conducting base 1, and a plurality of heating grooves 2 are formed in the heat-conducting base 1, and a PTC heating assembly 3 is correspondingly clamped in each heating groove 2. The PTC heating assembly 3 includes a mounting bracket 4 and a PTC thermistor assembly 5. The mounting bracket 4 includes a U-shaped structure 41, and a mounting groove 42 with an open top is arranged in the U-shaped structure 41, and the PTC thermistor assembly 5 is correspondingly clamped in the mounting groove 42. A pressing spring 43 is formed by bending the top end of a side wall of the U-shaped structure 41, and an expansion slot 44 is formed between the lower end of the pressing spring 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 pressing spring 43 is pressed. The pressing of the pressing spring 43 of the mounting bracket 4 enables the PTC heating assembly 3 to be tightly mounted in the heating groove 2 of the heat-conducting base 1.

[0032] As shown in Figure 3 , the PTC heating assembly 3 includes a PTC thermistor frame 7, a PTC thermistor element 10, a first electrode sheet 8, a second electrode sheet 9, and a heat-conducting silica gel film 6. The PTC thermistor frame 7 is provided with a mounting slot 74, the PTC thermistor element 10 is fixedly clamped in the mounting slot 74, the first electrode sheet 8 and the second electrode sheet 9 are correspondingly attached to the two sides of the PTC thermistor frame 7, and are respectively tightly attached to the two sides of the PTC thermistor element 10. The heat-conducting silica gel film 6 is correspondingly wrapped outside the first electrode sheet 8 and the second electrode sheet 9 on the two sides of the PTC thermistor frame 7. The PTC heater of the utility model can realize the insulation connection of the PTC heating assembly 3 and the mounting bracket 4, the pressing of the pressing spring 43 of the mounting bracket 4 enables the PTC thermistor element 10 to form close and large electrical contact area with the electrode sheets on the two sides, ensures the good heat dissipation of the heat generated by the PTC thermistor element 10, the pressing of the pressing spring 43 and the heat-conducting base 1 and the electrode sheets reduces the thermal resistance, and realizes high thermal efficiency.

[0033] As shown in Figure 4 and Figures 6-7 , two side frames on one side of the PTC thermistor frame 7 are respectively provided with limiting buckles 71. 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 the two sides of the first electrode sheet 8 are respectively provided with connecting lug blocks 83 for clamping the limiting buckles 71, and the first electrode sheet 8 is fixedly connected with the PTC thermistor frame 7 through the cooperation of the limiting buckles 71 and the connecting lug blocks 83.

[0034] As shown in Figure 8As shown in the drawings, the PTC thermistor frame 7 is provided with a positioning column 73 on the side of the frame body corresponding to the first electrode sheet 8, and the first electrode sheet 8 is provided with a positioning hole 81 at the corresponding position, the positioning column 73 can be clamped into the positioning hole 81, and the first electrode sheet 8 is initially positioned by the positioning column 73 and the positioning hole 81 when the first electrode sheet 8 is butted against the PTC thermistor frame 7, so that the limiting buckle 71 is fixedly connected with the connecting lug 83. The supporting bracket 72 is correspondingly arranged on the bottom of the frame body on the side corresponding to the first electrode sheet 8, and the lower end of the first electrode sheet 8 can be supported on the supporting bracket 72, and the first electrode sheet 8 is initially clamped on the supporting bracket 72 when the first electrode sheet 8 is installed, then the positioning hole 81 of the first electrode sheet 8 is clamped on the positioning column 73, and finally the limiting buckle 71 is buckled on the connecting lug 83, so that the first electrode sheet 8 is fixedly connected with the PTC thermistor frame 7.

[0035] As shown in the drawings, Figure 5 The second electrode sheet 9 is fixedly connected with the PTC thermistor frame 7 through the fixing piece 91, and the area of the second electrode sheet 9 is smaller than the area of the side of the PTC thermistor frame 7 and larger than the area of the installation slot 74, and the second electrode sheet 9 is connected with the PTC thermistor frame 7 in a fixed manner in a normal state, and the first electrode sheet 8 is connected with the PTC thermistor frame 7 in a detachable manner, so as to facilitate the assembly of the PTC thermistor element 10.

[0036] As shown in the drawings, Figures 3-5 The first electrode sheet 8 and the second electrode sheet 9 are respectively provided with the first electrode lug 82 and the second electrode lug 92 at the top ends.

[0037] The above is the preferred embodiment of the present application, and it should be pointed out that, for ordinary skilled in the art, without departing from the principles of the present application, a number of improvements and refinements can be made, and these improvements and refinements should be considered as the protection scope of the present application.

Claims

1. A PTC heater characterized by, The PTC heater (100) comprises a heat-conducting base (1) with a plurality of heating grooves (2) formed therein, and a PTC heating assembly (3) correspondingly clamped in each heating groove (2); The PTC heating assembly (3) comprises a mounting bracket (4) and a PTC thermistor assembly (5), the mounting bracket (4) comprises a U-shaped structure (41) with an open top mounting groove (42) formed therein, and the PTC thermistor assembly (5) is correspondingly clamped in the mounting groove (42); the U-shaped structure (41) is bent at the top of one side wall to form a compression spring (43), and the lower end of the compression spring (43) and the side wall of the U-shaped structure (41) form an expansion slot (44), and the expansion slot (44) is correspondingly reduced after the lower end of the compression spring (43) is compressed.

2. The PTC heater according to claim 1, characterized in that, The PTC heating assembly (3) comprises: A PTC thermistor frame (7) with a mounting slot (74) formed therein; A PTC thermistor element (10) fixedly clamped in the mounting slot (74); A first electrode sheet (8) and a second electrode sheet (9) correspondingly attached to the two large faces of the PTC thermistor frame (7) and closely attached to the two sides of the PTC thermistor element (10), respectively; A heat-conducting silicone film (6) correspondingly covering the outer sides of the first electrode sheet (8) and the second electrode sheet (9) on the two sides of the PTC thermistor frame (7).

3. The PTC heater according to claim 2, characterized in that, Limiting buckles (71) are arranged on the two side frames of 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 the two sides of the first electrode sheet (8) are respectively provided with connecting ear blocks (83) for clamping the limiting buckles (71).

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

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

6. The PTC heater according to claim 2, wherein The second electrode sheet (9) is fixedly connected to the side of the PTC thermistor frame (7) by a fixing member (91) different from the first electrode sheet (8), 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).

7. The PTC heater according to claim 6, characterized in that First and second electrode ear blocks (82) and (92) are respectively arranged at the top of the first and second electrode sheets (8) and (9).

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