Flexible PTC heater

Abstract

The utility model provides a flexible PTC (Positive Temperature Coefficient) heater, which comprises outer-ring heat dissipation strips, the outer-ring heat dissipation strips comprise outer-ring heat dissipation fins and outer-ring connecting plates, the outer-ring connecting plates are disconnected at intervals to form a plurality of independent outer connecting plates and inner-ring heat dissipation strips, the inner-ring heat dissipation strips comprise inner-ring heat dissipation fins and inner-ring connecting plates, and the outer-ring heat dissipation fins and the inner-ring connecting plates are connected with the inner-ring heat dissipation strips. The inner ring connecting plates are disconnected at intervals to form a plurality of independent inner connecting plates, a plurality of PTC heating pieces are bonded between the outer connecting plates and the inner connecting plates through heat conduction glue, and electric connectors are arranged at the ends of the outer ring heat dissipation strips and the ends of the inner ring heat dissipation strips respectively. The PTC heater has the advantages that the inner connecting plate and the outer connecting plate which are connected with the PTC heating piece are relatively independent units, small heating units which are relatively independent are formed after the whole straight line is pressurized and solidified, the whole PTC heater can be bent into any shape according to an installation fixing structure at the moment, the connecting plates and the PTC heating piece are not prone to degumming, and the service life of the PTC heater is prolonged. And the application range of the PTC heater is effectively expanded.

Description

TECHNICAL FIELD

[0001] The utility model belongs to PTC heater technical field, concretely relates to a flexible PTC heater. BACKGROUND

[0002] PTC electric heater is a kind of electric heater based on semiconductor material, its working principle is to use the characteristics of PTC (positive temperature coefficient) material heating, in the power-on state can itself heat, with high thermal efficiency, power, no open fire, safety and other advantages, is the ideal material of heating device.

[0003] But most of the PTC heater on the market is still mainly linear cuboid heater, it is difficult to arrange regular cuboid PTC heater in the case of limited space or special shape, so a flexible structure is needed to adapt to complex installation structure.Furthermore, although there are a small number of arc heaters in the prior art, but the connecting piece will appear the phenomenon of delamination between PTC heating sheet and heat dissipation strip due to the influence of bending stress in the long-term cold and hot alternating working environment, so a flexible PTC heater with reliable use performance and applicable to complex installation structure is needed. UTILITY MODEL CONTENTS

[0004] In order to solve the above problems, the utility model provides a kind of flexible PTC heater, including: a kind of flexible PTC heater, including: outer circle heat dissipation strip, the outer circle heat dissipation strip includes outer circle heat dissipation sheet and outer circle connecting plate, the outer circle connecting plate is spaced apart and forms multiple separate outer connecting plates, inner circle heat dissipation strip, the inner circle heat dissipation strip includes inner circle heat dissipation sheet and inner circle connecting plate, the inner circle connecting plate is spaced apart and forms multiple separate inner connecting plates, uses heat-conducting adhesive to bond multiple PTC heating sheets between the outer connecting plate and inner connecting plate, respectively sets up electric connector in the end of outer circle heat dissipation strip and inner circle heat dissipation strip.

[0005] As a preferred scheme, the number of outer connecting plate and inner connecting plate is same as the number of PTC heating sheet.

[0006] As a preferred scheme, the outer circle heat dissipation sheet is fixedly connected with multiple separate outer connecting plates as an integral piece.

[0007] As a preferred scheme, the inner circle heat dissipation sheet is fixedly connected with multiple separate inner connecting plates as an integral piece.

[0008] As a preferred scheme, one end of outer circle heat dissipation strip and inner circle heat dissipation strip is respectively provided with outer circle connecting structure and inner circle connecting structure for connecting power supply connector.

[0009] As a preferred scheme, the outer circle connecting structure and inner circle connecting structure are respectively arranged on the opposite sides of the head and tail of outer circle heat dissipation strip and inner circle heat dissipation strip.

[0010] As a priority program, the outer ring connection structure and the inner ring connection structure are respectively arranged on the same side of the outer ring heat dissipation strip and the inner ring heat dissipation strip, and the two connection structures are respectively arranged away from the center of the PTC heating sheet to the two sides in order to avoid the connection structures of the two electrodes being too close to cause short circuit.

[0011] As a priority program, the outer ring connection structure and the inner ring connection structure are respectively arranged on the same side of the outer ring heat dissipation strip and the inner ring heat dissipation strip, and the two connection structures are respectively arranged away from the center of the PTC heating sheet to the two sides in order to avoid the connection structures of the two electrodes being too close to cause short circuit.

[0012] As a priority program, the outer ring connection structure and the inner ring connection structure are respectively arranged on the same side of the outer ring heat dissipation strip and the inner ring heat dissipation strip, and the two connection structures are respectively arranged away from the center of the PTC heating sheet to the two sides in order to avoid the connection structures of the two electrodes being too close to cause short circuit.

[0013] As a priority program, the outer ring connection structure and the inner ring connection structure are respectively arranged on the same side of the outer ring heat dissipation strip and the inner ring heat dissipation strip, and the two connection structures are respectively arranged away from the center of the PTC heating sheet to the two sides in order to avoid the connection structures of the two electrodes being too close to cause short circuit.

[0014] The flexible PTC heater has the advantages that the inner and outer connection plates connected with the PTC heating sheet are relatively independent units, and after the whole straight line is pressurized and solidified, a plurality of relatively independent small heating units are formed, at this time, the whole PTC heater can be bent into any shape according to the mounting and fixing structure, and the connection plate and the PTC heating sheet are not easy to be delaminated, and the use range of the PTC heater is effectively expanded. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application, the drawings needed in the following embodiment description will be briefly introduced. Obviously, the following drawings only show some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0016] Figure 1 It is a flexible PTC heater assembly schematic view

[0017] Figure 2 It is a flexible PTC heater explosion schematic view

[0018] Figure 3 It is a flexible PTC heater straight line type processing schematic view

[0019] Figure 4 It is another embodiment assembly schematic view

[0020] Figure 5 It is another embodiment connection plate schematic view

[0021] Figure 6 It is a flexible PTC heater special-shaped schematic view

[0022] 1 - outer circle heat dissipation strip; 11 - outer circle heat dissipation fin; 12 - outer circle connecting plate; 121 - outer connecting plate; 13 - outer circle connecting structure; 2 - inner circle heat dissipation strip; 21 - inner circle heat dissipation fin; 22 - inner circle connecting plate; 221 - inner connecting plate; 23 - inner circle connecting structure; 3 - PTC heating fin; 4 - electrical connector; DETAILED DESCRIPTION

[0023] The exemplary embodiments of the present application will be described in detail below with reference to the accompanying drawings. The same reference numbers in different drawings denote the same or similar elements throughout the several illustrative embodiments. Although various aspects of embodiments are illustrated in the drawings, the drawings are not necessarily drawn to scale unless specifically noted.

[0024] It should be understood that the terms "inner", "outer", "front", "back", "left", "right", "head", "tail" and the like, indicate relative or positional relationships based on the orientation or position shown in the drawings, and are only used to facilitate the description of the present application or simplify the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0025] The design will be further described below in conjunction with the structural description of the drawings.

[0026] As shown in Figures 1-4 A flexible PTC heater, comprising: an outer circle heat dissipation strip 1, the outer circle heat dissipation strip comprising an outer circle heat dissipation fin 11 and an outer circle connecting plate 12, the outer circle connecting plate 12 being spaced apart to form a plurality of separate outer connecting plates 121, an inner circle heat dissipation strip 2, the inner circle heat dissipation strip 2 comprising an inner circle heat dissipation fin 21 and an inner circle connecting plate 22, the inner circle connecting plate being spaced apart to form a plurality of separate inner connecting plates 221, a plurality of PTC heating fins 3 being bonded between the outer connecting plates 121 and the inner connecting plates 221 using heat-conducting adhesive, and an electrical connector 4 being provided at the end of the outer circle heat dissipation strip and the inner circle heat dissipation strip, respectively.

[0027] As shown in Figure 3The processing and assembling process of the flexible PTC heater is as follows: first, the outer ring heat dissipation strip 11 and the outer ring connecting plate 12 are fixed by brazing or adhesive bonding to form an integral body, then the outer ring connecting plate 12 is spaced apart to form a plurality of separate outer connecting plates 121, the number of the outer connecting plates 121 is the same as the number of the PTC heating pieces, and the outer ring heat dissipation strip 11 and all the outer connecting plates 121 are kept as an integral body, that is, the power supply is connected between the separate outer connecting plates 121 through the outer ring heat dissipation strip 11, so as to ensure that the heat dissipation strip 1 can supply power to each PTC heating piece at the same time. The inner ring heat dissipation strip 21 and the inner ring connecting plate 22 are fixed by brazing or adhesive bonding to form an integral body, then the inner ring connecting plate 22 is spaced apart to form a plurality of separate inner connecting plates 221, the number of the inner connecting plates 221 is the same as the number of the PTC heating pieces, and the inner ring heat dissipation strip 21 and all the inner connecting plates 221 are kept as an integral body, that is, the power supply is connected between the separate inner connecting plates 221 through the outer ring heat dissipation strip 21, so as to ensure that the heat dissipation strip 2 can supply power to each PTC heating piece at the same time. Then the PTC heating piece is placed between the outer connecting plate 121 and the inner connecting plate 221 with heat-conducting glue, the PTC heating piece is in plane contact with the outer connecting plate 121 and the inner connecting plate 221, and then the conventional straight strip type PTC heater is used for pressure curing, so that the separate small piece outer connecting plate 121, the inner connecting plate 221 and a piece of PTC heating piece 3 are firmly bonded to form a small heating unit. After performance qualification, the whole strip can be bent to form a PTC heater with a corresponding shape according to the shape of the mounting and fixing structure.

[0028] Further, in order to ensure the performance stability of each small heating unit, the number of the outer connecting plate 121 and the inner connecting plate 221 is the same as the number of the PTC heating piece 3, and in order to simultaneously ensure the bonding strength of the connecting plate and the PTC heating piece and the flexibility of the whole PTC heater, the plane connection size of the connecting plate is basically the same as the plane connection size of the PTC heating piece.

[0029] Further, the outer ring heat dissipation strip 11 and the plurality of separate outer connecting plates 121 are fixed as an integral body, which can be realized by brazing or adhesive bonding.

[0030] Further, the inner ring heat dissipation strip 21 and the plurality of separate inner connecting plates 221 are fixed as an integral body, which can be realized by brazing or adhesive bonding.

[0031] Further, one end of the outer ring heat dissipation strip 1 and the inner ring heat dissipation strip 2 is respectively provided with an outer ring connecting structure 13 and an inner ring connecting structure 23 for connecting the electric connector 4, and the outer ring connecting structure 13 and the inner ring connecting structure 23 are respectively arranged at the head and tail of the outer ring heat dissipation strip 1 and the inner ring heat dissipation strip 2. Figure 1The outer ring connecting structure 13 and the inner ring connecting structure 23 can be formed by stamping one end of the outer ring connecting plate 12 and the inner ring connecting plate 22, or by bending one end of the outer ring heat sink 11 and the inner ring heat sink 21.

[0032] Furthermore, in order to improve heat dissipation efficiency, the connecting plate 1222 is made of a thin aluminum plate with a high thermal conductivity, and the thickness of the aluminum plate is preferably 0.2mm to 1mm.

[0033] Furthermore, in order to improve heat dissipation efficiency and increase the flexibility of the entire PTC heater, the heat sink 1121 is made of thin aluminum plate, with the aluminum plate thickness preferably being 0.1mm to 0.5mm.

[0034] like Figure 4 Another embodiment differs from the above embodiment in that the outer ring connecting structure 13 and the inner ring connecting structure 23 are respectively provided on the same side of the outer ring heat dissipation strip 1 and the inner ring heat dissipation strip 2. Furthermore, to avoid short circuits caused by the two electrode connecting structures being too close, the outer ring connecting structure 13 and the inner ring connecting structure 23 are respectively positioned away from the center of the PTC heating element 3. Figure 4 The outer ring connecting structure 13 and the inner ring connecting structure 23 can be formed by bending one end of the outer ring connecting plate 12 and the inner ring connecting plate 22, as shown below. Figure 5 Alternatively, it can be formed by bending one end of the outer ring heat sink 11 and the inner ring heat sink 21.

[0035] The embodiments of this application have been described above. These descriptions are exemplary and not exhaustive, nor are they limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terminology used herein is chosen to best explain the principles of the embodiments, their practical application, or improvements to the technology in the market, or to enable others skilled in the art to understand the embodiments disclosed herein.

Claims

1. A flexible PTC heater, characterized by: an outer ring heat sink (1), the outer ring heat sink including an outer ring heat sink (11) and an outer ring connecting plate (12), the outer ring connecting plate (12) being spaced apart to form a plurality of separate outer connecting plates (121); an inner ring heat sink (2), the inner ring heat sink (2) including an inner ring heat sink (21) and an inner ring connecting plate (22), the inner ring connecting plate being spaced apart to form a plurality of separate inner connecting plates (221); a plurality of PTC heating elements (3) being bonded between the outer connecting plate (121) and the inner connecting plate (221) using thermally conductive adhesive; and electrical connectors (4) being respectively provided at the ends of the outer ring heat sink (1) and the inner ring heat sink (2).

2. The flexible PTC heater according to claim 1, characterized in that: The number of the outer connecting plate (121) and the inner connecting plate (221) is the same as the number of PTC heating elements.

3. A flexible PTC heater according to claim 2, characterized in that: The outer ring heat sink (11) is fixedly connected to multiple separate outer connecting plates (121) as a single unit.

4. A flexible PTC heater according to claim 3, characterized in that: The inner ring heat sink (21) is fixedly connected to multiple individual inner connecting plates (221) as a single unit.

5. A flexible PTC heater according to claim 4, characterized in that: One end of the outer ring heat dissipation strip (1) and the inner ring heat dissipation strip (2) are respectively provided with an outer ring connection structure (13) and an inner ring connection structure (23).

6. A flexible PTC heater according to claim 5, characterized in that: The outer ring connection structure (13) and the inner ring connection structure (23) are respectively located on opposite sides of the outer ring heat sink (1) and the inner ring heat sink (2).

7. A flexible PTC heater according to claim 5, characterized in that: The outer ring connection structure (13) and the inner ring connection structure (23) are respectively set on the same side of the outer ring heat sink (1) and the inner ring heat sink (2). However, in order to avoid the connection structures of the two electrodes being too close to each other and causing a short circuit, the two connection structures are set away from the center of the PTC heating element (3) respectively.

8. A flexible PTC heater according to any one of claims 6 to 7, characterized in that: The outer ring connecting structure (13) and the inner ring connecting structure (23) are respectively provided with one end of the outer ring connecting plate (12) and the inner ring connecting plate (22).

9. A flexible PTC heater according to claim 8, characterized in that: Both the outer ring connecting plate (12) and the inner ring connecting plate (22) are made of thin aluminum plates with a thickness of 0.2mm to 1mm.

10. A flexible PTC heater according to claim 9, characterized in that: The outer ring heat sink (11) and the inner ring heat sink (21) are made of thin aluminum plates, forming a flexible wave shape, with a thickness of 0.1mm to 0.5mm.

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