PTC (Positive Temperature Coefficient) constant-temperature heating tape

Abstract

The utility model discloses a PTC constant temperature heating tape, comprising a plurality of PTC heating sheets, a connecting wire and a thermal shrinkage insulation flexible pipe, the plurality of PTC heating sheets are uniformly arranged in the thermal shrinkage insulation flexible pipe, the plurality of PTC heating sheets are electrically connected through the connecting wire, and a gap is arranged between two adjacent PTC heating sheets. According to the utility model, the gaps are arranged between the PTC heating sheets, so that the whole PTC heating element can be bent, compared with the conventional PTC heating element which cannot be bent, the usage occasion of the PTC heating element is greatly increased, in addition, the connecting wires adopt the insulated and high-temperature-resistant flexible electrodes, so that not only can electric leakage be prevented, but also the service life of the PTC heating element is prolonged. And the device can be adaptively matched with the bending of the device and bear the high temperature of the heating sheet.

Description

Technical Field

[0001] The utility model relates to the technical field of PTC heating elements, and particularly relates to a PTC constant temperature heating belt. Background Art

[0002] The PTC heating element usually consists of a ceramic heating element and an aluminum tube. The PTC heating element has the advantages of small thermal resistance and high heat exchange efficiency, and is an automatic constant temperature and power-saving electric heater. Its prominent feature lies in its safety performance. In any application situation, it will not produce the surface "reddening" phenomenon of heaters such as electric heating tubes, thus causing safety hazards such as scalding and fire.

[0003] However, the existing PTCs are usually in a one-piece or multi-piece structure connected end to end and then installed in a fixed shell. This type of structure is not bendable and cannot be used in many scenarios that require bending, which limits its application scenarios. Therefore, it is necessary to make improvements. Summary of the Utility Model

[0004] The purpose of the utility model is to overcome the above-mentioned defects in the prior art and provide a PTC constant temperature heating belt that can be bent, adapt to different application scenarios, and increase its practicability.

[0005] To achieve the above purpose, the utility model provides a PTC constant temperature heating belt, including: a plurality of PTC heating sheets, connecting wires, and a heat-shrinkable insulating hose. The plurality of PTC heating sheets are evenly arranged in the heat-shrinkable insulating hose. The plurality of PTC heating sheets are electrically connected by the connecting wires, and there is a gap between adjacent two PTC heating sheets.

[0006] Further, the size of the gap ≥ 10 mm. A gap of more than 10 mm makes the bending angle of the heating belt larger and more convenient to use.

[0007] Further, the gap is filled with a soft filling material. By filling the soft filling material, it is possible to avoid the collision of adjacent PTC heating sheets during bending while enabling the heating belt to be bent.

[0008] Further, the soft filling material is silicone gel or other soft filling materials.

[0009] Further, an electrode coating is applied to the surface of the PTC heating sheet. The electrode coating can improve the conduction performance of the PTC heating sheet and adapt to different connection methods of structures.

[0010] The above-mentioned electrode coating can be a sintered aluminum paste layer, a nickel plating layer, a nickel-chromium alloy plating layer, a zinc plating layer, a sintered zinc alloy layer, a tin plating layer, a sintered silver layer, or other coatings with equivalent functions.

[0011] Further, a sunken area is provided on the PTC heating sheet, and the sunken areas of two adjacent PTC heating sheets are connected by connecting wires, so that several PTC heating sheets are connected in parallel in sequence.

[0012] Further, the connecting wire and the sunken area are welded to form a first welding point, which can increase the firmness between the connecting wire and the PTC heating sheet.

[0013] Further, it further includes several metal conductive sheets, and the metal conductive sheets are distributed and laid on the electrode coating, so that the metal conductive sheets are electrically connected to the PTC heating sheet through the electrode coating, and the adjacent two metal conductive sheets are connected by connecting wires. By providing the metal conductive sheets and the electrode coating, the sequential electrical connection of the connecting wire, the metal conductive sheet, the electrode coating and the PTC heating sheet can be realized. In this way, the connecting wire can be directly welded to the metal conductive sheet, which is convenient for replacing each part.

[0014] Further, the connection part of the connecting wire and the metal conductive sheet is welded to form a second welding point, which can make the connection between the connecting wire and the metal conductive sheet more firm.

[0015] Further, the metal conductive sheet is a conductive sheet made of aluminum, red copper, brass or stainless steel, which can ensure that the metal conductive sheet is conducted with the connecting wire and the PTC heating sheet respectively, and can quickly conduct heat to the PTC heating sheet at the same time.

[0016] Compared with the prior art, the utility model has the following advantages: by providing a gap between the PTC heating sheets, the whole utility model can be bent, which greatly increases the application scenarios of the utility model compared with the conventional non-bendable PTC heating element. In addition, the connecting wire adopts an insulating and high-temperature-resistant flexible electrode, which can not only prevent electric leakage, but also adaptively cooperate with the bending of the utility model and withstand the high temperature of the heating sheet; heating the heat-shrinkable insulating hose can play a protective role and can tightly shrink it with the PTC heating sheet. On the one hand, it makes the heating belt form a whole, and on the other hand, it reduces the internal air gap and is easy to conduct heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0018] Figure 1 It is a schematic structural diagram of Embodiment 1 of a PTC constant temperature heating belt of the present utility model;

[0019] Figure 2 It is a schematic structural diagram of Embodiment 2 of a PTC constant temperature heating belt of the present utility model;

[0020] Figure 3 is Figure 2 an enlarged schematic diagram of area A in

[0021] Figure 4 It is a schematic structural diagram of Embodiment 3 of a PTC constant temperature heating belt of the present utility model;

[0022] Figure 5 is Figure 4 an enlarged schematic diagram of area B in.

[0023] In the figure, it includes:

[0024] 1. PTC heating sheet; 11. Sinking area; 2. Connecting wire; 3. Heat-shrinkable insulating hose; 4. Gap; 5. Electrode coating; 6. First welding point; 7. Metal conductive sheet; 8. Second welding point. Specific embodiments

[0025] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only one embodiment of the present utility model, rather than all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0026] It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0027] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present utility model, such descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features.

[0028] Please refer to Figures 1 to 5 , and the embodiments of the present utility model provide a PTC constant temperature heating belt.

[0029] Embodiment 1

[0030] The PTC constant temperature heating belt of this embodiment, as Figure 1As shown in the figure, it includes: several PTC heating elements 1, connecting wires 2, and a heat-shrinkable insulating hose 3. In this embodiment, there are three PTC heating elements 1, which are only shown schematically, and the specific quantity can be adjusted according to actual needs. The above-mentioned several PTC heating elements 1 are evenly arranged in the heat-shrinkable insulating hose 3. As Figure 1 shown, the PTC heating elements 1 are arranged horizontally inside the heat-shrinkable insulating hose 3, making the whole in a horizontally-oriented strip structure. The above-mentioned several PTC heating elements 1 are electrically connected through the connecting wires 2, so that the PTC heating elements 1 are connected in parallel in sequence, and are externally connected to a power source through the lead wires. In this embodiment, a gap 4 is provided between two adjacent PTC heating elements 1, and the size of this gap 4 is 20 mm. Of course, it can also be greater than 20 mm and be adjusted according to the actual situation.

[0031] In this embodiment, the PTC heating element 1 is a constant-temperature heating element, which can automatically adjust its own power under different heat dissipation conditions to keep its heating temperature constant. The temperature of the PTC heating element 1 is generally selected from 30 to 300 °C, and the surface temperature is determined according to the use requirements.

[0032] The setting of the heat-shrinkable insulating hose 3 is to protect the heating element. The heat-shrinkable insulating hose 3 shrinks inward at the shrinkage temperature, fastening the PTC heating element 1 and the wire together to protect the PTC heating element 1 and the connecting wire 2 from being damaged; the heat-shrinkable insulating hose 3 should be able to withstand the high temperature of the heating element and will not be damaged under the normal working conditions of the heating element; the texture of the heat-shrinkable insulating hose 3 uses a relatively soft heat-shrinkable tube, making the heating belt easy to bend. The material of the heat-shrinkable insulating hose 3 is preferably but not limited to a silicone rubber heat-shrinkable tube, and it can also be other heat-shrinkable tubes.

[0033] In some preferred embodiments, a soft filling material can also be filled in the gap 4. This soft filling material can be silicone gel, or can be replaced with other soft filling materials with equivalent effects. By filling the soft filling material, while enabling the heating belt to be bendable, it can avoid the situation where adjacent PTC heating elements 1 collide when bending.

[0034] Brief description of the working principle of the present invention: The present invention leaves enough gaps 4 between the PTC heating elements, and then uses the heat-shrinkable insulating hose 3 to shrink and protect the heating elements and the connecting wires 2. When in use, the whole can be bent through the reserved gaps 4, so that it can be applied to positions that need to be bent, greatly increasing the applicability of the present invention and improving the flexibility of product use.

[0035] Embodiment 2

[0036] The difference between this embodiment and Embodiment 1 is that, in this embodiment, as Figure 2 and Figure 3As shown in the figure, the overall shape of the PTC heating sheet 1 is square. Sunken areas 11 are provided at the four corners of the PTC heating sheet 1. The sunken areas 11 of two adjacent PTC heating sheets 1 are connected by a connecting wire 2, so that several PTC heating sheets 1 are connected in parallel in sequence to achieve electrical connection. In order to increase the conductivity between the connecting wire and the sunken area 11, an electrode coating 5 is coated on the surface of the PTC heating sheet 1 provided with the sunken area 11. The electrode coating 5 can be a sintered aluminum paste layer, a nickel plating layer, a nickel-chromium alloy plating layer, a zinc plating layer, a sintered zinc alloy layer, a tin plating layer, a sintered silver layer or other coatings with equivalent functions. Further, the connecting wire 2 and the sunken area 11 are welded to form a first welding point 6, which can increase the firmness between the connecting wire 2 and the heating sheet. In addition, the size of the gap 4 in this embodiment is 10 mm, and the others are the same as those in Embodiment 1, and the same effect as that of Embodiment 1 is achieved.

[0037] Embodiment 3

[0038] The difference between this embodiment and Embodiment 1 is that, as Figure 4 and Figure 5 shown in the figure, this embodiment further includes a number of metal conductive sheets 7 that match the number of PTC heating sheets 1. The metal conductive sheets 7 can be conductive sheets made of aluminum, pure copper, brass or stainless steel. Of course, other materials with equivalent effects can also be used to make the metal conductive sheets 7.

[0039] An electrode coating 5 is coated on the surface of the PTC heating sheet 1. Through the electrode coating 5, the conductivity of the heating sheet can be increased. The electrode coating 5 can be a sintered aluminum paste layer, a nickel plating layer, a nickel-chromium alloy plating layer, a zinc plating layer, a sintered zinc alloy layer, a tin plating layer, a sintered silver layer or other coatings with equivalent functions;

[0040] The above-mentioned metal conductive sheets 7 are distributed and laid on the electrode coating 5, so that the metal conductive sheets 7 are electrically connected to the heating sheet through the electrode coating 5. Two adjacent metal conductive sheets 7 are connected by a connecting wire 2. Specifically, the connection between the connecting wire 2 and the metal conductive sheet 7 is welded to form a second welding point 8. By providing the metal conductive sheets 7 and the electrode coating 5, the electrical connection of the connecting wire 2, the metal conductive sheet 7, the electrode coating 5 and the heating sheet can be realized in sequence. In this way, the connecting wire 2 can be directly welded to the metal conductive sheet 7, which is convenient for replacing each part. In addition, the size of the gap 4 in this embodiment is 10 mm, and the others are the same as those in Embodiment 1, and the same effect as that of Embodiment 1 is achieved.

[0041] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A PTC constant temperature heating belt, characterized in that, Including: A number of PTC heating sheets (1), connecting wires (2) and heat-shrinkable insulating hoses (3). The number of PTC heating sheets (1) are uniformly arranged in the heat-shrinkable insulating hose (3). The number of PTC heating sheets (1) are electrically connected by the connecting wires (2), and a gap (4) is provided between two adjacent PTC heating sheets (1).

2. The PTC constant temperature heating belt according to claim 1, wherein, The size of the gap (4) ≥ 10 mm.

3. The PTC constant temperature heating belt according to claim 2, characterized in that, The gap (4) is filled with a soft filling material.

4. The PTC constant temperature heating belt according to claim 3, characterized in that, The soft filling material is silicone gel.

5. The PTC constant temperature heating belt according to any one of claims 1-4, characterized in that, An electrode coating (5) is coated on the surface of the PTC heating sheet (1).

6. The PTC constant temperature heating belt according to claim 5, characterized in that, A sunken area (11) is provided on the PTC heating sheet (1). The sunken areas (11) of two adjacent PTC heating sheets (1) are connected by the connecting wire (2), so that the number of PTC heating sheets (1) are connected in parallel in sequence.

7. The PTC constant temperature heating belt according to claim 6, wherein The connecting wire (2) and the sunken area (11) are welded to form a first welding point (6).

8. The PTC constant temperature heating belt according to claim 5, characterized in that, It further includes a number of metal conductive sheets (7). The metal conductive sheets (7) are distributed and laid on the electrode coating (5), so that the metal conductive sheets (7) are electrically connected to the PTC heating sheet (1) through the electrode coating (5). The adjacent two metal conductive sheets (7) are connected by the connecting wire (2).

9. The PTC constant temperature heating belt according to claim 8, characterized in that, The connection between the connecting wire (2) and the metal conductive sheet (7) is welded to form a second welding point (8).

10. The PTC constant temperature heating belt according to claim 8, wherein The metal conductive sheet (7) is a conductive sheet made of aluminum, red copper, brass or stainless steel.

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