PTC heater for defrosting

Abstract

The utility model discloses a PTC (Positive Temperature Coefficient) heater for defrosting, which belongs to the technical field of PTC heaters and comprises an aluminum shell, an aluminum pipe, radiating fins and a PTC chip, the aluminum shell is a cuboid, a plurality of air heating cavities are formed in the aluminum shell at equal intervals in the horizontal direction in a penetrating mode, two symmetrically-arranged aluminum pipes are arranged in the aluminum shell in the vertical direction in a penetrating mode, a plurality of cooling fins are symmetrically arranged on the periphery of each aluminum pipe, a chip groove is formed in one end of each aluminum pipe, the other end of each aluminum pipe is closed, and a PTC chip is arranged in each chip groove. The PTC chip with the heating function is assembled and then inserted into the aluminum pipe, so that the aluminum pipe is heated, the aluminum pipe uniformly heats the aluminum shell where the aluminum pipe is located through the radiating fins on the outer side, after the temperature of the aluminum shell is uniformly increased, the fan conveys air to the PTC heater for defrosting, and the air is uniformly heated after passing through the aluminum shell with the air heating cavities, so that the defrosting effect is improved. Hot air is blown to the evaporator, so that the surface of the evaporator is defrosted, and the defrosting efficiency is high.

Description

Technical Field

[0001] This utility model belongs to the field of PTC heater technology, specifically relating to a PTC heater for defrosting. Background Technology

[0002] During operation, a refrigerator compressor needs to draw in air, but this air contains moisture. This moisture evaporates inside the compressor, absorbing heat and causing the temperature to drop, resulting in frost buildup on the compressor surface. This frost layer adheres to the evaporator surface, hindering heat exchange between the air and the evaporator. This slows down the refrigerator's cooling speed, making it difficult to reach the desired temperature. It also increases the compressor's power consumption and, in severe cases, can overload and damage the compressor.

[0003] PTC material can achieve automatic temperature control, automatically adjusting the heating power according to the ambient temperature and heat dissipation conditions (such as air cooling intensity). It outputs high power to quickly heat up when starting at low temperatures, and the power decreases when approaching the target temperature, resulting in high energy efficiency. In the field of refrigerator defrosting, heat can be evenly distributed to the evaporator fins through aluminum heat-conducting components, avoiding incomplete defrosting or overheating damage to the pipeline.

[0004] Chinese utility model patent CN216448449U discloses an evaporator for defrosting a refrigerator based on a PTC heater. The design includes a mounting plate, heat dissipation fins, an evaporator tube assembly, a PTC heater, a heat-conducting component, a liquid collection box, and a condensation mechanism. When frost forms on the heat dissipation fins, the PTC heater generates heat, which is then dissipated through the heat-conducting component. However, this design directly heats the heat dissipation fins with the PTC heater, causing the frost on the evaporator tube assembly to melt into condensate. This condensate dripping onto the PTC heater affects its heating efficiency. Furthermore, this method results in a temperature difference between the upper and lower ends of the heat dissipation fins, leading to different defrosting efficiencies. Before defrosting at the upper end of the fins is complete, the lower end may be too hot, resulting in a large temperature difference within the evaporator tube assembly and affecting the evaporator's operation. Utility Model Content

[0005] The purpose of this invention is to solve the problem of how to uniformly heat the surface of an evaporator and improve defrosting efficiency, and to provide a PTC heater for defrosting.

[0006] The objective of this utility model can be achieved through the following technical solutions:

[0007] A defrosting PTC heater includes an aluminum shell, aluminum tubes, heat dissipation fins, and a PTC chip. The aluminum shell is a cuboid with multiple air heating chambers equidistantly arranged in the horizontal direction. Two symmetrically arranged aluminum tubes are arranged in the vertical direction. Multiple heat dissipation fins are symmetrically arranged around the aluminum tubes. A chip slot is opened at one end of the aluminum tube and closed at the other end. A PTC chip is placed in the chip slot.

[0008] Furthermore, the air heating chamber is a rectangular cavity located on the side of the aluminum shell along its length.

[0009] Furthermore, the aluminum tube is cylindrical, and the heat dissipation fins are rectangular.

[0010] Furthermore, the PTC chip is a rectangular chip with two electrode plates on each side. The two electrode plates are covered with an insulating film, and a PTC shell is placed outside the insulating film.

[0011] Furthermore, the electrode interfaces on the two electrode plates are misaligned.

[0012] Furthermore, the PTC housing is a rectangular cavity with the middle of both ends of the rectangular cavity recessed inward to form an "M" shape. The recessed "M" shaped structure fixes the PTC chip in the center of the PTC housing.

[0013] Furthermore, the shape of the chip slot is adapted to the PTC housing.

[0014] Furthermore, a PTC heater for defrosting is installed between the evaporator and the fan.

[0015] The beneficial effects of this utility model are:

[0016] This invention assembles a PTC chip with heating function and inserts it into an aluminum tube, heating the tube. The aluminum tube is then uniformly heated by the heat dissipation fins on its outer side. After the aluminum shell is uniformly heated, a fan sends air through the PTC defrosting heater. The air is then uniformly heated after passing through the aluminum shell, which has multiple air heating chambers. The hot air is then blown onto the evaporator, causing defrosting on the evaporator surface. The PTC heater does not directly contact the defrosting area, thus not affecting the temperature inside the evaporator tube. The heating airflow provides a more uniform and gentle defrosting process, resulting in more even heating of the evaporator surface and high defrosting efficiency. The PTC defrosting heater is sealed at both ends, forming a single unit with excellent airtightness and IP67 waterproof performance. It also features automatic temperature control and high safety. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0018] Figure 2 This is a top view of the present invention;

[0019] Figure 3 This is a front view of the present utility model;

[0020] Figure 4 This is a schematic diagram of the aluminum tube structure of this utility model;

[0021] Figure 5 This is a schematic diagram of the PTC chip structure of this utility model;

[0022] In the diagram: 1. Aluminum shell; 11. Air heating chamber; 2. Aluminum tube; 21. Heat dissipation fins; 22. Chip slot; 3. PTC chip; 31. Electrode plate; 32. Insulating film; 33. PTC housing. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not 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 effort are within the protection scope of the present utility model.

[0024] Example:

[0025] Please see Figures 1-4 As shown, a defrosting PTC heater includes an aluminum shell 1, an aluminum tube 2, heat dissipation fins 21, and a PTC chip 3.

[0026] The aluminum shell 1 is a cuboid. Multiple air heating chambers 11 are equidistantly arranged in the horizontal direction of the aluminum shell 1. Each air heating chamber 11 is a rectangular cavity located on the long side of the aluminum shell 1. Two symmetrically arranged aluminum tubes 2 are arranged in the vertical direction of the aluminum shell 1. The aluminum tubes 2 are cylindrical and have rectangular heat dissipation fins 21. A chip slot 22 is opened at one end of the aluminum tube 2, and the other end of the aluminum tube 2 is closed. Multiple heat dissipation fins 21 are symmetrically arranged around the aluminum tube 2. The heat dissipation fins 21 are rectangular and are used to improve the heat conduction effect of the PTC chip 3 after it is heated. The PTC chip 3 is placed in the chip slot 22.

[0027] Please see Figure 5 As shown, the PTC chip 3 is a rectangular chip with two electrode plates 31 on each side. The electrode interfaces on the two electrode plates 31 are staggered. The two electrode plates 31 are covered with an insulating film 32. A PTC housing 33 is set outside the insulating film 32. The PTC housing 33 is a rectangular cavity with the middle of the left and right ends of the rectangular cavity recessed inward to form an "M" shape. The recessed "M" shaped structure fixes the PTC chip 3 in the center of the PTC housing 33. The PTC housing 33 is made by inserting the PTC chip 3 into the rectangular housing and then hydraulically pressing it.

[0028] The shape of the chip slot 22 is adapted to the PTC housing 33.

[0029] In this embodiment, a PTC heater for defrosting is installed between the evaporator and the fan. The fan blows the heat from the PTC heater onto the evaporator, achieving the technical effect of defrosting the evaporator.

[0030] Working principle:

[0031] This invention assembles a PTC chip 3 with heating function and inserts it into an aluminum tube 2, which heats the aluminum tube 2. The aluminum tube 2 is uniformly heated by the heat dissipation fins 21 on the outside. After the aluminum tube 2 is uniformly heated, the fan sends air through the defrosting PTC heater. The air is uniformly heated after passing through the aluminum tube 1 which has multiple air heating chambers 11. The hot air is blown to the evaporator, causing the surface of the evaporator to defrost.

[0032] Usage steps:

[0033] The defrosting PTC heater is controlled by a timer or frost sensor. When defrosting is needed, the compressor is turned off, the defrosting PTC heater is heated, and the fan delivers outside natural air to the defrosting PTC heater, raising its temperature. The heated air then comes into contact with the evaporator surface, causing the evaporator surface to begin defrosting. The water produced during defrosting is discharged through the drain hole. After defrosting is complete, the power is turned off to allow the defrosting PTC heater to return to normal temperature, and the compressor is turned on to continue cooling.

[0034] It should be noted that, in this document, terms such as “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. A PTC heater for defrosting, characterized in that, It includes an aluminum shell (1), an aluminum tube (2), heat sink fins (21), and a PTC chip (3); The aluminum shell (1) is a cuboid. Multiple air heating chambers (11) are equidistantly arranged in the horizontal direction of the aluminum shell (1). Two symmetrically arranged aluminum tubes (2) are arranged in the vertical direction of the aluminum shell (1). Multiple heat dissipation fins (21) are symmetrically arranged around the aluminum tubes (2). A chip slot (22) is opened at one end of the aluminum tube (2), and the other end of the aluminum tube (2) is closed. A PTC chip (3) is set in the chip slot (22).

2. The PTC heater for defrosting according to claim 1, characterized in that, The air heating cavity (11) is a rectangular cavity located on the side where the length of the aluminum shell (1) lies.

3. A PTC heater for defrosting according to claim 1, characterized in that, The aluminum tube (2) is cylindrical, and the heat dissipation fins (21) are rectangular.

4. A PTC heater for defrosting according to claim 1, characterized in that, The PTC chip (3) is a rectangular chip with two electrode plates (31) on each side. The two electrode plates (31) are covered with an insulating film (32), and a PTC shell (33) is provided outside the insulating film (32).

5. A PTC heater for defrosting according to claim 4, characterized in that, The electrode interfaces on the two electrode plates (31) are misaligned.

6. A PTC heater for defrosting according to claim 5, characterized in that, The PTC housing (33) is a rectangular cavity with the middle of the left and right ends of the rectangular cavity recessed inward to form an "M" shape. The recessed "M" shaped structure fixes the PTC chip (3) in the center of the PTC housing (33).

7. A PTC heater for defrosting according to claim 1, characterized in that, The shape of the chip slot (22) is adapted to the PTC housing (33).

8. A PTC heater for defrosting according to claim 1, characterized in that, The defrosting PTC heater is installed between the evaporator and the fan.

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