Round surface PTC heater

Abstract

A PTC heater with a round surface comprises a shell, a heat dissipation body and a blocking piece, the heat dissipation body is a cylinder with a cavity in the middle, a PTC heating element and an electrode plate are bonded, then wrapped with an insulation sleeve and stuffed into the cavity of the heat dissipation body, a wire is riveted to the electrode plate, and the wire is used for being connected with an external power source. Compared with the prior art, two independent electrode strips with a heat dissipation function are replaced, the assembly process is simplified, the production efficiency is improved, in addition, as the heat dissipation body is made into an integral cylinder, an aluminum alloy inner round pipe in the prior art is omitted, the price of raw materials of the product is reduced, the price of the whole product is reduced, and the production cost is reduced. And the market competitiveness of the product is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of electric heating, in particular to a circular surface PTC heater. Background Art

[0002] PTC electric heater is an electric heater based on semiconductor materials. Its working principle is to use the characteristics of PTC (positive temperature coefficient) materials for heating. It can generate heat by itself when powered on. It has the advantages of high thermal efficiency, high power, no open flame, and safety. It is an ideal material for heating devices.

[0003] At present, a circular surface PTC heater generally has several PTC heating sheets arranged between two separate semicircular electrode strips, which are then wrapped with an insulating film on the outside and placed in an aluminum alloy inner tube. The two ends of the aluminum alloy inner tube are respectively provided with a wire end silicone plug and an inner tube silicone plug. The aluminum alloy outer tube is sleeved on the outside of the aluminum alloy inner tube, and a sealing plug is provided at one end of the aluminum alloy outer tube. A heat-conducting material is filled between the inner wall of the aluminum alloy outer tube and the outer wall of the aluminum alloy inner tube to form a circular PTC heater, such as patent document CN215420827U. Such a product has many parts and components, and the assembly process is relatively complicated, and the output is relatively low, so there is room for improvement. Utility Model Content

[0004] In order to solve the above problems, the utility model provides a circular surface PTC heater, which is dedicated to simplifying the assembly process, improving production capacity and reducing the overall cost of the product.

[0005] The utility model provides a circular surface PTC heater comprising: a shell, a heat sink, and a plug. The heat sink is a cylinder with a cavity in the middle. The PTC heating element and the electrode sheet are bonded, wrapped with an insulating sleeve, and then inserted into the cavity of the heat sink. The electrode sheet is riveted with a wire, and the wire is used to connect an external power supply.

[0006] Furthermore, the shape of the cavity in the heat sink is rectangular, and its shape is designed to match the shape of the PTC heating element.

[0007] Furthermore, a positioning groove is arranged on the surface of the heat sink, and the position of the groove is located in the middle of the arc above the force-bearing surface of the heat sink cavity.

[0008] Furthermore, the material of the heat sink is preferably an aluminum alloy material with a large thermal conductivity in order to quickly radiate the heat.

[0009] Furthermore, the shell is made of metal material to improve the corrosion resistance of the product.

[0010] Furthermore, in order to ensure the insulation performance of the product, an insulating sleeve is added to the riveted joints of the wires.

[0011] Compared with the prior art, the beneficial effects of the utility model are:

[0012] 1. The heat sink is directly made into an integral structure, replacing the two separate electrode strips that previously had a heat dissipation function, simplifying the assembly process.

[0013] 2. Since the heat sink itself is made into an integral cylinder, the aluminum alloy inner tube in the prior art is omitted, thereby reducing the price of raw materials for the product.

[0014] 3. The front and rear silicone plugs are replaced by plugging pieces and potting glue, which simplifies the process and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate exemplary embodiments and features of the present application and, together with the description, serve to explain the principles of the present application.

[0016] Figure 1 This is a diagram of a circular surface PTC heater assembly.

[0017] Figure 2 Schematic diagram of the explosion effect of a circular surface PTC heater.

[0018] Figure 3 A schematic diagram of a heat sink of a circular surface PTC heater.

[0019] Figure 4 This is a plan view of the interior of a circular surface PTC heater and a stress diagram of the compressed tube. DETAILED DESCRIPTION

[0020] The exemplary embodiments of the present application will be described in detail with reference to the accompanying drawings. The same reference numerals in the accompanying drawings represent elements with the same or similar functions. Although various aspects of the embodiments are shown in the accompanying drawings, the drawings are not necessarily drawn to scale unless otherwise specified.

[0021] It should be understood that the directions or positional relationships indicated by terms such as “upper”, “lower”, “front”, “back”, “left” and “right” are based on the directions or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present invention or simplifying the description. They do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0022] The word “exemplary” is used exclusively herein to mean “serving as an example, example, or illustration.” Any embodiment described herein as “exemplary” is not necessarily to be construed as preferred or advantageous over other embodiments.

[0023] The design is further explained below in conjunction with the accompanying drawings of the structural specification.

[0024] like Figure 1-4 As shown,

[0025] The utility model provides a circular surface PTC heater comprising: a shell 1, a heat sink 2, and a plug 3. The heat sink 2 is a cylinder with a cavity 201 in the middle. A PTC heating element 4 and an electrode sheet 5 are bonded, wrapped with an insulating sleeve 6, and then inserted into the cavity of the heat sink 2. A wire 7 is riveted on the electrode sheet 5, and the wire 7 is used to connect an external power supply.

[0026] The assembly process of this product is as follows: first, rivet the electrode sheet 5 to the conductor 7 and then apply adhesive, high-temperature resistant and heat-conductive silicone. Then, place the heating element 4 between the two electrode sheets 5 with silicone. After wrapping with an insulating layer, insert it into a heat sink 2 with a cavity. Press the tube and solidify it into an integral heating core. Pre-weld a plug 3 at the rear end of the shell 1 to form a cylindrical shape and perform an airtightness test. After no leakage is found, inject silicone into the interior (silicone may not be injected), and then press the solidified integral heating core into the shell 1 to complete the assembly.

[0027] The shape of the cavity in the heat sink 2 matches the shape of the PTC heating element 4, preferably a rectangular shape. In order to ensure the positioning of the circular heat sink in the tube pressing process, a groove is provided on the surface of the heat sink. The position of the groove is located in the middle of the arc above the force-bearing surface 203 of the heat sink cavity. The positioning groove also has a function of having a certain exhaust effect when the heat sink is installed in the shell, which is conducive to assembly. The material of the heat sink 2 is preferably an aluminum alloy material with a large thermal conductivity.

[0028] In order to ensure the corrosion resistance of the product, the material of the housing 1 is preferably metal, such as stainless steel or titanium.

[0029] In order to ensure the insulation performance of the product, an insulating sleeve 8 is added to the riveted joint of the wire.

[0030] The embodiments of the present application have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The selection of terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other persons of ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A circular surface PTC heater, comprising: a shell (1), a heat sink (2), and a blocking sheet (3); the heat sink (2) is a cylinder with a cavity (201) in the middle; a PTC heating element (4) and an electrode sheet (5) are bonded, wrapped with an insulating sleeve (6), and then inserted into the heat sink cavity (201); a wire (7) is riveted on the electrode sheet (5); and the wire (7) is used to connect an external power supply.

2. A circular surface PTC heater according to claim 1, characterized in that: The cavity (201) in the heat sink (2) is rectangular in shape, and its shape matches the shape of the PTC heating element (4).

3. A circular surface PTC heater according to claim 2, characterized in that: A positioning groove (202) is provided on the surface of the heat sink (2), and the groove is located at the middle of the arc above the force-bearing surface (203) of the heat sink cavity.

4. A circular surface PTC heater according to claim 3, characterized in that: The heat sink (2) is made of an aluminum alloy material with a high thermal conductivity.

5. A circular surface PTC heater according to claim 4, characterized in that: The shell (1) is made of metal material to improve the corrosion resistance of the product.

6. A circular surface PTC heater according to claim 5, characterized in that: An insulating sleeve (8) is provided at the riveted joint of the conductor (7) to improve the insulation between the two electrodes.

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