Defrosting electric heating tube structure of air cooler

Abstract

The utility model discloses an electric heating tube structure for defrosting of an air cooler, which is mounted in a finned coil of the air cooler and comprises a hollow tube, and the hollow tube can be embedded into the finned coil of the air cooler. The electric heating film is attached to the inner wall of the hollow pipe, the electric heating film is provided with a built-in electrode layer, meanwhile, the electrode layer is connected with a wire, and the electrode layer is electrically connected with an external power source through the wire. According to the electric heating tube structure, the electric heating film is adopted to replace a traditional metal electric heating wire, manufacturing cost is reduced, low-temperature defrosting can be achieved, large rising of the temperature and the humidity during defrosting is avoided, and safe and energy-saving defrosting is achieved.

Description

TECHNICAL FIELD

[0001] The utility model relates to cold storage electric heating defrosting technical field especially relates to a cold air blower defrosting electric heating pipe structure. BACKGROUND

[0002] The defrosting methods commonly used in cold air blower include electric heating defrosting, hot gas defrosting, hot water defrosting, ethylene glycol defrosting, etc. Among the above methods, the electric heating defrosting structure is the simplest, is suitable for cold storage of various temperatures, and is widely used in defrosting of small cold air blower, but has problems of high power consumption during operation, large temperature fluctuation of the cold storage during defrosting, etc.

[0003] The existing electric heating defrosting device commonly uses an electric heating rod containing metal heating wire, and the temperature reaches 200-400 DEG C after electrification, which is much higher than the temperature required for defrosting. Not only there are safety problems, but also the temperature and relative humidity of the cold storage during defrosting will rise significantly, which affects the quality of stored goods, increases the cooling load and the amount of frost of the cold air blower in the next refrigeration cycle, and consumes a large amount of electric energy.

[0004] In addition, the existing electric heating defrosting device commonly uses the method of inserting the electric heating rod into the small hole reserved in the fin, and there is a large gap between the electric heating rod and the inner wall of the hole, so the contact thermal resistance is large, which weakens the heat transfer to the fin and the heat exchange pipe during defrosting, and greatly reduces the defrosting efficiency.

[0005] Therefore, for the cold air blower using the electric heating defrosting method in the prior art, how to realize safe, energy-saving and reliable electric heating defrosting is the key to improving the operation efficiency of the cold air blower, and the technical personnel in the field urgently need to develop a cold air blower defrosting electric heating pipe structure. UTILITY MODEL CONTENTS

[0006] The utility model aims at providing a cold air blower defrosting electric heating pipe structure, which improves the defrosting efficiency and reduces the power consumption during defrosting by using the structure of built-in electric heating film to solve the problems of excessively high heating temperature and low defrosting efficiency of the existing cold air blower electric heating defrosting device, and realizes safe and energy-saving electric heating defrosting.

[0007] In order to realize the above-mentioned purpose, the utility model provides the following technical scheme:

[0008] The utility model relates to a cold air blower defrosting electric heating pipe structure, which is installed in the fin coil of the cold air blower, and the electric heating pipe structure comprises:

[0009] A hollow pipe, which can be embedded in the fin coil of the cold air blower, is preferably a support pipe that has been installed in the fin coil of the cold air blower; and

[0010] An electric heating film attached to the inner wall of the hollow pipe, wherein the electric heating film has a built-in electrode layer, and the electrode layer is connected with a wire, and the electrode layer is electrically connected with an external power supply through the wire.

[0011] Further, the electrothermal film comprises:

[0012] a bottom electrically insulating layer attached to the inner wall of the hollow tube; and

[0013] a top electrically insulating layer arranged opposite to the bottom electrically insulating layer, and a heating layer arranged between the bottom electrically insulating layer and the top electrically insulating layer;

[0014] the electrode layer is connected to both the heating layer and the bottom electrically insulating layer, and the top electrically insulating layer is provided with a wire hole for passing the wire.

[0015] Further, one side of the electrode layer is connected to the upper surface of the bottom electrically insulating layer, and the other side of the electrode layer is connected to the upper surface of the heating layer.

[0016] The wire is connected to the part where the electrode layer is connected to the bottom electrically insulating layer.

[0017] Further, the length of the heating layer is smaller than the length of the bottom electrically insulating layer, and the width of the heating layer is smaller than the width of the bottom electrically insulating layer.

[0018] The width of the electrode layer is smaller than the width of the bottom electrically insulating layer.

[0019] The length and width of the top electrically insulating layer are equal to the length and width of the bottom electrically insulating layer.

[0020] Further, the hollow tube is provided with end caps at both ends, and the end caps are provided with round holes for passing the wire, and the wire is connected to an external power source after passing through the round holes.

[0021] Further, the hollow tube is a support tube that has been installed in the finned coil of the air cooler, or a metal tube with an outer diameter smaller than the diameter of the round hole on the fin of the air cooler that is not passed through by the heat exchange tube and the support tube.

[0022] Further, the materials of the bottom electrically insulating layer and the top electrically insulating layer are polyimide or epoxy resin.

[0023] Further, the material of the heating layer is graphene or graphene oxide or carbon fiber or carbon nanotube or PEDOT:PSS.

[0024] Further, the material of the electrode layer is copper foil or silver foil.

[0025] Further, the position where the wire is fixedly welded to the electrode layer is coated with insulating glue.

[0026] Further, the layers are fixedly adhered by an adhesive.

[0027] In the above technical solutions, the cold air machine defrosting electric heating pipe structure has the following beneficial effects:

[0028] The electric heating pipe structure of the utility model adopts electric heating film to replace traditional metal electric heating wire, reduces manufacturing cost, can realize low temperature defrosting, avoids that warehouse temperature and humidity have great rise during defrosting, realizes safe, energy-saving defrosting.

[0029] The electric heating pipe structure of the utility model is that the electric heating film is attached to the inner wall of the cold air machine supporting pipe, can reduce the contact thermal resistance between the electric heating film and the fin, improves heat conduction effect and defrosting efficiency, and reduces electric energy consumption. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments will be briefly introduced as follows, obviously, the drawings in the following description are only some embodiments described in the utility model, and other drawings can also be obtained according to these drawings for the ordinary skilled in the art.

[0031] Fig. 1 The structure diagram of the cold air machine defrosting electric heating pipe structure disclosed in the embodiments of the utility model is shown in the figure.

[0032] Fig. 2 The partial sectional view of the cold air machine defrosting electric heating pipe structure disclosed in the embodiments of the utility model is shown in the figure.

[0033] Fig. 3 The electric heating film plane expansion schematic diagram of the cold air machine defrosting electric heating pipe structure disclosed in the embodiments of the utility model is shown in the figure.

[0034] Explanation of reference signs:

[0035] 1, hollow pipe; 2, electric heating film; 3, wire;

[0036] 21, bottom electric insulating layer; 22, heating layer; 23, electrode layer; 24, top electric insulating layer; 25, wiring hole. DETAILED DESCRIPTION

[0037] In order to make the skilled in the art better understand the technical scheme of the utility model, the utility model will be further introduced in detail in combination with the drawings.

[0038] Referring to Figs. 1 to 3 As shown in the figure.

[0039] The cold air machine defrosting electric heating pipe structure of the embodiment, the electric heating pipe structure is installed in the fin coil of the cold air machine, and the electric heating pipe structure comprises:

[0040] The hollow tube 1 can be embedded in the finned coil of the air cooler; and

[0041] The electrothermal film 2 is attached to the inner wall of the hollow tube 1, and the electrothermal film 2 has an embedded electrode layer 23, and the electrode layer 23 is connected with a wire 3, and the electrode layer 23 is electrically connected with an external power source through the wire 3.

[0042] Specifically, the embodiment discloses a defrosting electrothermal tube structure of an air cooler, which mainly has the electrothermal film 2 of the embodiment attached in the hollow tube 1, so that the electrothermal film 2 replaces the traditional metal electrothermal wire, and the manufacturing difficulty and cost are reduced, and low-temperature defrosting is realized.

[0043] Preferably, the electrothermal film 2 of the embodiment comprises a bottom electric insulation layer 21 attached to the inner wall of the hollow tube 1, and a top electric insulation layer 24 arranged relative to the bottom electric insulation layer 21, and a heating layer 22 arranged between the bottom electric insulation layer 21 and the top electric insulation layer 24.

[0044] The electrode layer 23 is connected with the heating layer 22 and the bottom electric insulation layer 21, and the top electric insulation layer 24 is provided with a wiring hole for the wire 3 to pass through.

[0045] The embodiment further limits the structural composition of the electrothermal film 2. First, the hollow tube 1 of the embodiment can be installed in the finned coil of the air cooler, and the electrothermal film 2 of the embodiment is selected to have a multilayer structure with good bending resistance, which mainly comprises the bottom electric insulation layer 21, the top electric insulation layer 24, the heating layer 22 and the electrode layer 23. The heating layer 22 is located between the bottom electric insulation layer 21 and the top electric insulation layer 24, the bottom electric insulation layer 21 is attached to one side of the inner wall of the hollow tube 1, and the top electric insulation layer 24 is arranged relative to the bottom electric insulation layer 21. One end of the electrode layer 23 of the embodiment is connected with the bottom electric insulation layer 21, and the other end extends to the heating layer 22 and is connected with the heating layer 22. The electrode layer 23 causes the Joule heat effect of the heating layer 22 after being electrified.

[0046] Preferably, one side of the electrode layer 23 of the embodiment is connected with the upper surface of the bottom electric insulation layer 21, and the other side of the electrode layer 23 is connected with the upper surface of the heating layer 22.

[0047] The wire 3 is connected with the part of the electrode layer 23 connected with the bottom electric insulation layer 21.

[0048] The length of the heating layer 22 of the embodiment is less than the length of the bottom electric insulation layer 21, and the width of the heating layer 22 is less than the width of the bottom electric insulation layer 21.

[0049] The width of the electrode layer 23 is less than the width of the bottom electric insulation layer 21.

[0050] The length and width of the top electric insulation layer 24 are equal to the length and width of the bottom electric insulation layer 21.

[0051] The hollow tube 1 is provided with end caps at both ends, and the end caps are provided with a circular hole for passing the lead wire 3, and the lead wire 3 is connected with an external power source after passing through the circular hole.

[0052] Preferably, the hollow tube 1 of the embodiment is a supporting tube installed in the finned coil of the air cooler, or a metal tube with an outer diameter smaller than the diameter of the circular hole on the fin of the air cooler which is not passed through by the heat exchange tube and the supporting tube.

[0053] Preferably, the material of the bottom electrically insulating layer 21 and the top electrically insulating layer 24 of the embodiment is selected from organic insulating materials with good thermal conductivity and high temperature resistance, such as polyimide or epoxy resin.

[0054] Preferably, the material of the heating layer 22 of the embodiment is selected from materials with good ductility, moderate resistivity, and thin layer, such as graphene or graphene oxide or carbon fiber or carbon nanotube or PEDOT:PSS.

[0055] Preferably, the material of the electrode layer 23 of the embodiment is copper foil or silver foil.

[0056] Preferably, the position where the lead wire 3 is fixedly welded with the electrode layer 23 is coated with insulating glue. The layers are fixed by adhesive. At the same time, the wiring hole 25 is arranged at the position below the heating layer, so as to ensure that the heating layer 22 is not damaged during welding.

[0057] In addition, the structure of the embodiment closely adheres the electrothermal film 2 to the inner wall of the hollow tube 1, which is the key to preparing the defrosting electrothermal tube of the air cooler. Therefore, the embodiment further proposes a method for adhering the electrothermal film 2 to the inner wall of the hollow tube 1, which mainly includes a guide tube assisted film adhering method and an air bag assisted film adhering method.

[0058] Embodiment one:

[0059] Guide tube assisted film adhering method:

[0060] The film adhering tool used in the method includes a guide tube and adhesive tape. The film adhering tool has the following basic requirements: the material of the guide tube is preferably metal or hard acrylic, and has a certain rigidity. The surface of the guide tube needs to be smooth, flat and clean. The diameter of the guide tube needs to be smaller than the inner diameter of the hollow tube 1 to be adhered, and the length of the guide tube needs to be longer than the length of the hollow tube 1, so that the both ends of the guide tube can be exposed from the hollow tube 1 by about 5cm to 10cm after the guide tube is inserted into the hollow tube. The thickness of the adhesive tape is recommended to be less than 0.1mm, and the adhesive tape only plays a temporary fixing role and can be easily removed without leaving glue marks after removal. In addition, the electrothermal film 2 should be cut according to the size of the hollow tube 1 to be adhered before film adhering. The width of the electrothermal film 2 needs to be slightly larger than half of the circumference of the inner wall of the hollow tube 1, and the length of the electrothermal film 2 needs to be greater than the length of the hollow tube 1.

[0061] The specific implementation steps of the method are as follows:

[0062] 1. Clean the inner wall of the hollow tube 1 to be pasted with the film, to ensure that the inner wall is clean, smooth, and free of burrs and protrusions;

[0063] 2. Place the guide tube in the middle of the side of the electric heating film 2 with the wiring hole 25 (the axis of the guide tube is parallel to the long side of the electric heating film 2), and the two ends of the guide tube need to protrude beyond the electric heating film 2;

[0064] 3. Bend one end of the electric heating film 2 radially upward and fold it in half, and wrap the end of the electric heating film 2 with tape and fix it on the guide tube;

[0065] 4. Fix the hollow tube 1 to be pasted with the film so that it cannot move in the axial and radial directions, insert the guide tube into the hollow tube 1 from the end where the electric heating film 2 is fixed and slowly push it in, keeping the guide tube straight and not rotating during the process, and after the electric heating film 2 enters the hollow tube 1 with the guide tube, it naturally bends under the constraint of the inner wall of the tube and tightly adheres to the inner wall of the hollow tube 1;

[0066] 5. When the end of the guide tube with the electric heating film 2 protrudes from the hollow tube 1 by a suitable distance, remove the tape wrapped around the electric heating film 2 at that end, pull out the guide tube from the hollow tube 1, and by stretching the two ends of the electric heating film 2 that are exposed outside the hollow tube 1, the wiring hole 25 on the electric heating film 2 is located inside the hollow tube 1, only the insulating layer of the electric heating film 2 is exposed outside the hollow tube 1, and then the insulating layer exposed outside the hollow tube 1 is cut off.

[0067] The above steps are mainly for the case where the electric heating film 2 is not connected to the wire before pasting. After completing step 5 or installing the electric heating tube (i.e. the hollow tube 1 with the electric heating film 2 attached to the inner wall) in the finned coil of the air cooler, the end of the wire 3 can be fixed to the electrode layer 23 of the electric heating film 2 through the wiring hole 25 by welding or applying high-temperature resistant adhesive. If the electric heating film 2 is connected to the wire 3 before pasting, an additional operation of spirally wrapping the wire 3 around the advancing end of the guide tube and fixing it with tape is required in step 3, and the tape fixing the wire 3 needs to be removed additionally in step 5.

[0068] In this method, a more secure attachment can also be achieved by uniformly applying adhesive to the surface of the electric heating film 2 facing away from the guide tube or the inner wall of the hollow tube 1. The curing time of the adhesive used should be longer than the time required to complete the above steps.

[0069] Example Two:

[0070] Air bag assisted film pasting method:

[0071] The film sticking tool used in the method includes an air bag, an inflator, adhesive tape or an elastic band. The film sticking tool has the following basic requirements: the air bag after inflation is cylindrical and has high rigidity, the diameter of the cylindrical air bag is slightly smaller than the inner diameter of the hollow pipe 1 to be stuck with the film (the difference is about 2 times the thickness of the electrothermal film 2), and the length of the cylindrical air bag is greater than the length of the hollow pipe 1 and also greater than the length of the electrothermal film 2. On this basis, the inflation pressure is continuously increased, and the diameter of the cylindrical air bag can reach or slightly exceed the inner diameter of the hollow pipe 1. The thickness of the adhesive tape or the elastic band is recommended to be no more than 0.05 mm. The adhesive tape only plays a temporary fixing role and can be easily removed without leaving a glue mark after removal. In addition, the electrothermal film 2 should be cut according to the size of the hollow pipe 1 to be stuck with the film before sticking the film. The width of the electrothermal film 2 needs to be slightly smaller than the circumference of the inner wall of the hollow pipe 1, and the length of the electrothermal film 2 needs to be greater than the length of the hollow pipe 1.

[0072] The specific implementation steps of the method are as follows:

[0073] 1. Clean the inner wall of the hollow pipe 1 to be stuck with the film to ensure that the inner wall is clean, smooth and free of burrs and protrusions.

[0074] 2. Inflate the air bag to form a cylinder, and adjust the inflation pressure to make the cylindrical air bag have high rigidity.

[0075] 3. Stick the electrothermal film 2 tightly to the cylindrical air bag and apply a certain tension to form a cylinder, and the wiring hole 25 needs to be located on the inside of the cylindrical film, that is, the side of the cylindrical film directly in contact with the air bag. Use an elastic band or adhesive tape to fix the two ends of the cylindrical film on the cylindrical air bag.

[0076] 4. Fix the hollow pipe 1 to be stuck with the film so that it cannot move in the axial and radial directions, slowly insert the cylindrical air bag together with the electrothermal film 2 fixed thereon into the hollow pipe 1 until the two ends of the air bag are exposed outside the hollow pipe 1, adjust the position of the air bag so that the wiring hole 25 on the electrothermal film 2 is located inside the hollow pipe 1, and only the insulating layer of the electrothermal film 2 is exposed outside the hollow pipe 1. Remove the adhesive tape or elastic band at the two ends of the electrothermal film 2, and slowly release the gas in the air bag to make the electrothermal film 2 unfold in the hollow pipe 1 and adhere to the inner wall of the hollow pipe 1.

[0077] 5. Slowly inflate the air bag and increase the inflation pressure, and the air bag expands to press the electrothermal film 2 and the inner wall of the hollow pipe 1, so that the adhesion between the electrothermal film 2 and the inner wall of the hollow pipe 1 is more closely.

[0078] 6. After maintaining the pressure for a proper time, slowly release the gas in the air bag, and then remove the air bag from the hollow pipe 1, and then cut off the insulating layer of the electrothermal film 2 exposed outside the hollow pipe 1.

[0079] The method is only applicable to the case that the electrothermal film 2 is not connected with a wire before being attached. After the step 6 is completed or the electrothermal tube (i.e. the hollow tube 1 with the electrothermal film 2 attached to the inner wall) is installed in the finned coil of the air cooler, the end of the wire can be fixed on the electrode layer 23 of the electrothermal film 2 through the wiring hole by welding or applying a high-temperature resistant adhesive.

[0080] In the method, the attachment can also be made more firm by uniformly applying an adhesive on the surface of the electrothermal film 2 away from the air bag or on the inner wall of the hollow tube 1. The curing time of the adhesive used should be longer than the time required for completing the above steps. In the step 6, the inflation pressure should be maintained until the adhesive is completely cured.

[0081] The electrothermal tube can be formed by attaching the electrothermal film 2 to the inner wall of the hollow tube 1 according to the above implementation method. The electrothermal tube can be installed in the finned coil of the air cooler to form a defrosting electrothermal tube of the air cooler. In addition to the round holes passing through the heat exchange tubes, the fins and the tube plate of the air cooler also include support holes passing through the support tubes and round holes not passing through any tubes. The support tubes are hollow tubes which are tightly attached to the support holes in the fins and the tube plate by expanding.

[0082] In combination with the inherent structure of the air cooler and the method of attaching the electrothermal film 2 to the inner wall of the hollow tube 1 proposed above, the utility model proposes two implementation methods of installing the electrothermal tube in the finned coil of the air cooler, which are referred to as embodiment three and embodiment four.

[0083] In the embodiment three, the support tube originally existing in the air cooler is used as the hollow tube required for constructing the electrothermal tube, and the electrothermal film is attached to the inner wall of the support tube according to the embodiment one or the embodiment two.

[0084] Since the support tube is expanded and attached to the support holes in the fins and the tube plate of the air cooler, on the one hand, the contact thermal resistance between the electrothermal tube and the fins can be significantly reduced, which is beneficial to the efficient heat conduction from the electrothermal tube to the fins; on the other hand, the electrothermal tube is not easy to be separated from the inherent structure of the air cooler. In order to facilitate the maintenance and replacement of the electrothermal film in the later period, the adhesive should not be used when the electrothermal film is attached to the inner wall of the support tube.

[0085] In the embodiment four, the electric heating tube is directly inserted into the remaining round hole on the fin and tube plate of the air cooler. The diameter of the electric heating tube needs to be slightly smaller than the diameter of the round hole, and preferably the diameter of the support tube before tube expansion. The length of the electric heating tube needs to be slightly larger than the distance between the left and right tube plates of the air cooler. If the electric heating tube has been connected with the lead wire before being inserted into the fin coil of the air cooler, the lead wire 3 of the electric heating tube needs to be placed inside the hollow tube 1 and temporarily fixed by the adhesive tape or covered by the end cap. After the electric heating tube is inserted into the fin coil of the air cooler to the appropriate position, the adhesive tape fixing the lead wire 3 is loosened or the end cap is opened to move the free end of the lead wire 3 out of the electric heating tube. If the electric heating tube has not been connected with the lead wire 3 before being inserted into the fin coil of the air cooler, the end of the lead wire 3 needs to be fixed on the electrode layer 23 of the electric heating film 2 on the inner wall of the electric heating tube by welding or applying high-temperature resistant adhesive after the electric heating tube is inserted into the fin coil of the air cooler to the appropriate position.

[0086] Since the electric heating tube is directly inserted into the round hole without tube expansion, there is a gap between the electric heating tube and the round hole. Although this increases the contact thermal resistance between the electric heating tube and the fin and weakens the heat conduction between the electric heating tube and the fin, the electric heating tube is easier to separate from the inherent structure of the air cooler, which is beneficial to the maintenance and replacement of the electric heating tube in the later period and is also beneficial to the flexible arrangement of the position of the electric heating tube.

[0087] In the above technical solutions, the electric heating tube structure of the air cooler defrosting provided by the utility model has the following beneficial effects:

[0088] The electric heating tube structure of the utility model adopts the electric heating film 2 to replace the traditional metal electric heating wire, reduces the manufacturing cost, can realize low-temperature defrosting, avoids the great rise of the warehouse temperature and humidity during defrosting, realizes safe and energy-saving defrosting.

[0089] The electric heating tube structure of the utility model is that the electric heating film 2 is attached to the inner wall of the support tube of the air cooler, which can reduce the contact thermal resistance between the electric heating film 2 and the fin, improve the heat conduction effect and defrosting efficiency, and reduce the power consumption.

[0090] The above only describes some exemplary embodiments of the utility model by way of illustration, without doubt, for ordinary skilled in the art, under the condition of not deviating from the spirit and scope of the utility model, the described embodiments can be modified in various ways. Therefore, the above drawings and description are illustrative in nature and should not be understood as limiting the scope of protection of the claims of the utility model.

Claims

1. A defrosting heating element structure for a cold air blower, characterized in that, The heating element structure is installed in the finned coil of the air cooler, and the heating element structure includes: Hollow tube (1), said hollow tube (1) being able to be embedded in the finned coil of the air cooler; and An electrothermal film (2) is attached to the inner wall of the hollow tube (1), and the electrothermal film (2) has a built-in electrode layer (23). The electrode layer (23) is connected to a wire (3), and the electrode layer (23) is electrically connected to an external power source through the wire (3).

2. The defrosting heating element structure for a cold air blower according to claim 1, characterized in that, The electrothermal film (2) comprises: The bottom electrical insulation layer (21) attached to the inner wall of the hollow tube (1); and A heating layer (22) is provided between the bottom electrical insulation layer (21) and the top electrical insulation layer (24) relative to the bottom electrical insulation layer (21); The electrode layer (23) is connected to the heating layer (22) and the bottom electrical insulation layer (21), and the top electrical insulation layer (24) has a wiring hole (25) for passing through the wire (3).

3. The defrosting heating element structure for a cold air blower according to claim 2, characterized in that, One side of the electrode layer (23) is connected to the upper surface of the bottom electrical insulating layer (21), and the other side of the electrode layer (23) is connected to the upper surface of the heating layer (22); The wire (3) is connected to the portion where the electrode layer (23) and the bottom electrical insulation layer (21) are connected.

4. The defrosting heating element structure for a cold air blower according to claim 2, characterized in that, The length of the heating layer (22) is less than the length of the bottom electrical insulation layer (21), and the width of the heating layer (22) is less than the width of the bottom electrical insulation layer (21); The width of the electrode layer (23) is smaller than the width of the bottom electrical insulating layer (21); The length and width of the top electrical insulation layer (24) are equal to the length and width of the bottom electrical insulation layer (21).

5. The defrosting heating element structure for a cold air blower according to claim 2, characterized in that, The hollow tube (1) is provided with end caps at both ends, and the end caps have circular holes for the wire (3) to pass through. The wire passes through the circular holes and is connected to an external power source.

6. The defrosting heating element structure for a cold air blower according to claim 2, characterized in that, The hollow tube (1) is a support tube that has been installed in the finned coil of the air cooler, or a metal tube with an outer diameter smaller than the diameter of the circular hole on the finned coil of the air cooler that is not passed through by the heat exchange tube and the support tube.

7. The defrosting heating element structure for a cold air blower according to claim 2, characterized in that, The bottom electrical insulation layer (21) and the top electrical insulation layer (24) are made of polyimide or epoxy resin.

8. The defrosting heating element structure for a cold air blower according to claim 2, characterized in that, The heating layer (22) is made of graphene, graphene oxide, carbon fiber, carbon nanotubes, or PEDOT:PSS.

9. The defrosting heating element structure for a cold air blower according to claim 2, characterized in that, The electrode layer (23) is made of copper foil or silver foil.

10. The defrosting heating element structure for a cold air blower according to claim 3, characterized in that, Insulating adhesive is applied to the position where the wire (3) is welded and fixed to the electrode layer (23).

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