Nano-film quartz heater with aluminum shell and heat recovery function

Abstract

The invention provides a nano-film quartz heater with an aluminum shell with a heat recovery function. The nano-film quartz heater comprises a positive aluminum alloy shell and a reverse aluminum alloy shell which are oppositely arranged; a plurality of nano-film heating pipes are arranged between the front aluminum alloy shell and the back aluminum alloy shell; a nanometer material electrothermal film is arranged on the surface of each nanometer film heating pipe; the two ends of each nanometer film heating pipe are sequentially connected through waterway silica gel to form a series connection structure, and the two ends of the series connection structure are the water inlet end and the water outlet end respectively. The raw materials of the nanometer material electrothermal film comprise crystalline tin tetrachloride, antimony trichloride, indium trichloride, nickel dichloride, silver chloride and palladium chloride, and the materials are mixed to further improve the adhesive force and the resistivity of the electrothermal film and improve the durability and the heating performance of the nanometer film quartz heater.

Description

Technical Field

[0001] This invention relates to the field of heater technology, and in particular to a nanofilm quartz heater with an aluminum shell and heat recovery. Background Technology

[0002] Currently, common heating methods for electric water heaters on the market include resistance wire heating and electromagnetic radiation heating. Resistance wire heating suffers from drawbacks such as low thermal efficiency, low safety factor, high maintenance costs, and short lifespan. Electromagnetic heating also has drawbacks such as the harmful effects of electromagnetic radiation on the human body and high cost. Therefore, many types of heating elements, such as nano-heating films, have been developed. Nano-heating films are typically integrated with a good insulating and thermally conductive material (such as quartz glass or ceramics) through a high-temperature sintering coating process, forming a thin film (i.e., a resistive film layer) on the surface of the insulating and thermally conductive material. When current passes through the film surface, the film heats up, making it a planar resistive heating medium.

[0003] Compared to traditional electric heating elements, nano-electric heating films offer several advantages. For example, there is no air gap between the nano-electric heating film and the insulating heat conductor, eliminating convection losses and enabling direct heat conduction. Furthermore, nano-electric heating films can be sintered into various shapes according to design requirements, maximizing the utilization of the heat-conducting area and significantly improving heat transfer speed. Additionally, nano-electric heating films are very thin, consume no heat themselves, have low thermal inertia, and exhibit a faster thermal response speed than traditional electric heating elements. These advantages have gradually made nano-electric heating films the mainstream product in this field.

[0004] However, current nano-electrothermal films still suffer from three unresolved problems: 1. Poor bonding between the electrothermal film and the substrate, leading to film detachment and burning after repeated heating and cooling; 2. Complex manufacturing processes or the use of expensive raw materials, resulting in low cost-effectiveness; 3. Repeated heating and cooling cause micro-cracks in the conductive film layer, leading to significant attenuation of heating power. These three defects hinder the performance and widespread adoption of electrothermal films. These issues limit the development and application of nano-electrothermal film quartz heaters. Summary of the Invention

[0005] Purpose of the invention: The purpose of this invention is to provide a nanofilm quartz heater with an aluminum shell and heat recovery, in order to overcome the problems of easy film detachment and burning of the nano-electrothermal film in existing nanofilm quartz heaters, as well as the large resistance change rate and unstable heating under long-term use or changes in ambient temperature, and to expand the application range of nanofilm quartz heaters.

[0006] The technical solution of the present invention:

[0007] A nanofilm quartz heater with an aluminum shell and heat recovery, characterized in that it comprises a positive aluminum alloy shell and a negative aluminum alloy shell arranged opposite to each other; a plurality of nanofilm heating tubes are disposed between the positive aluminum alloy shell and the negative aluminum alloy shell; the surface of each nanofilm heating tube is provided with the nanomaterial electrothermal film; the two ends of each nanofilm heating tube are sequentially connected by water-channel silicone to form a series structure, the two ends of the series structure being a water inlet and a water outlet, respectively;

[0008] The raw materials for the nanomaterial electrothermal film include crystalline tin tetrachloride, antimony trichloride, indium trichloride, nickel dichloride, silver chloride, and palladium chloride.

[0009] In some embodiments, the mass fraction of crystalline tin tetrachloride is 85-95% based on the total mass of the raw materials of the nanomaterial electrothermal film being 100%; preferably, the mass fraction of crystalline tin tetrachloride is 90%.

[0010] In some embodiments, the mass ratio of antimony trichloride, indium chloride, nickel chloride, silver chloride, and palladium chloride is 6-17:0.3-1:15-20:0.5-1:2-4; preferably, the mass ratio of antimony trichloride, indium chloride, nickel chloride, silver chloride, and palladium chloride is 3:0.16:6:0.22:1.

[0011] In some embodiments, the preparation method of the nanomaterial electrothermal film includes: spraying the electrothermal film liquid onto the surface of the nanofilm heating tube using a high-temperature furnace, thereby obtaining the film.

[0012] In some embodiments, the method for preparing the electrothermal film liquid is as follows: crystalline tin tetrachloride, antimony trichloride, indium trichloride, nickel dichloride, silver chloride, and palladium chloride are measured according to the above weight ratio, added to a mixer, and then ethanol is added to mix and heat. The mixture is continuously stirred and ultrasonically dispersed to dissolve all the solids. After cooling to room temperature, the mixture is filtered to obtain the electrothermal film liquid.

[0013] In some implementations, both the inlet and outlet ends are equipped with NTC (temperature sensor) to detect water temperature.

[0014] In some embodiments, the water inlet is further provided with a stainless steel U-shaped pipe, which is installed in the groove of the aluminum alloy shell and connected to the water inlet via a silicone connecting pipe and a plastic water channel; wherein, the aluminum alloy shell serves to protect space and recover heat, the silicone connecting pipe serves to seal, and the plastic water channel serves to connect the water path and fix and seal.

[0015] In some embodiments, the nanomaterial electrothermal film is connected to the electrodes via a circuit, and both ends of the electrodes are provided with copper contacts for power connection.

[0016] In some embodiments, a stainless steel spring may also be provided inside the nanofilm heating tube, which can eliminate air bubbles and guide the flow of water.

[0017] In some embodiments, the positive aluminum alloy shell may also be equipped with a dry-burning temperature control, which can prevent dry burning due to lack of water.

[0018] In some embodiments, the thermal conductivity of both the positive and negative aluminum alloy shells is 220-260 W / m·K; the thermal conductivity of the stainless steel U-tube is 20-35 W / m·K.

[0019] The working principle of the nanofilm quartz heater is as follows: water flows from the stainless steel U-shaped tube into the silicone connecting tube and the plastic water channel in sequence, and then enters the nanofilm heating tube through the water inlet. Inside the nanofilm heating tube, the water is heated by the nanomaterial electric heating film, and then flows out through the water outlet to complete the heating effect.

[0020] Beneficial effects:

[0021] The nanofilm quartz heater provided by this invention utilizes a nanomaterial electrothermal film with high adhesion and durability, preventing film detachment and exhibiting strong durability. It can rapidly generate heat when energized and maintains stable heating even under long-term use or changes in ambient temperature. The nanofilm quartz heater provided by this application boasts high electrothermal efficiency, rapid heating, energy saving, environmental friendliness, longer lifespan, and wide applicability. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the disassembled structure of the nanofilm quartz heater provided in this application.

[0023] In the diagram: 1. Positive aluminum alloy shell; 2. Stainless steel U-tube; 3. Anti-dry burning temperature control; 4. Silicone pressure plate; 5. Silicone; 6. Silicone connecting tube; 7. Plastic water pipe; 8. Water circuit silicone; 9. NTC sealing ring; 10. NTC; 11. Negative aluminum alloy shell; 12. Stainless steel spring; 13. Power connection copper clip; 14. Nanofilm heating tube. Detailed Implementation

[0024] The present invention will be described below with reference to specific embodiments. It should be noted that the following embodiments are examples of the present invention and are used only to illustrate the invention, not to limit it. Other combinations and various modifications within the scope of the present invention can be made without departing from its spirit or scope.

[0025] Unless otherwise specified, all chemical reagents used in this invention are commercially available analytical grade. Crystalline tin tetrachloride (item number 3435) used in the examples was purchased from Ruidong Chemical; antimony trichloride was purchased from Keward; indium trichloride was purchased from Suzhou Kangpeng; nickel dichloride was purchased from Guanghua Technology; silver chloride was purchased from Guanghua Technology; and palladium chloride was purchased from Jiuling Chemical.

[0026] Examples 1-5

[0027] Weigh out crystalline tin tetrachloride, antimony trichloride, indium trichloride, nickel dichloride, silver chloride, and palladium chloride according to the mass fractions in Table 1, add them to a mixer, add 50 mL of ethanol, mix and heat to 65°C, continuously stir and ultrasonically disperse for 1 hour to dissolve all the solids, cool to room temperature, filter, and the electrothermal film liquid is obtained.

[0028] The substrate material is placed in a high-temperature spray coating furnace and gradually heated to 650℃. The temperature is maintained for 10 minutes. Then, 8 ml of electrothermal film liquid is sprayed into the high-temperature spray coating furnace in two batches through a spraying device. The film liquid is fully vaporized at high temperature and forms a uniform thin film layer on the outer surface of the substrate material. After the film coating is completed, it is sent to an annealing furnace at an annealing temperature of 400℃ for 20 minutes.

[0029] Table 1. Raw material ratio table for the embodiment

[0030]

[0031]

[0032] Comparative Examples 1-5

[0033] Comparative Examples 1-5 were prepared according to the method of the embodiments, the only difference being that the types and quality of the raw materials added in the comparative examples are shown in Table 2.

[0034] Table 2 Comparative Example Raw Material Ratio Table

[0035] Unit: grams Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 Comparative Example 5 Crystalline tin tetrachloride 80.00 98.00 90.00 90.00 90.00 Antimony trichloride 7.49 0.60 3.36 5.49 0 Indium trichloride 0.33 0.03 0.34 0 5.30 Nickel dichloride 6.51 0.75 5.91 0 3.59 silver chloride 0.14 0.05 0 0.46 0.21 Palladium chloride 5.53 0.37 1.49 3.05 0 Ferric chloride 0 0 0 1.00 0.90

[0036] The following experiments were conducted on the electrothermal films obtained in the above embodiments and comparative examples:

[0037] Experiment 1: Adhesion test. The adhesion test was conducted according to the relevant requirements of JB / T 8554—1997 "Scratch Test Method for Adhesion of Vapor Deposited Thin Films to Substrates". A WS-2005 automatic coating adhesion scratch tester was used for the test, with a loading rate of 5 N / min and a scratch rate of 2 mm / min.

[0038] Experiment 2: Resistance change rate. The resistance change rate I was measured when the working temperature was increased from room temperature to 1000℃, and the resistance change rate II was measured after working at room temperature for 2000 hours.

[0039] Experiment 3: Thin film thickness was tested using conventional testing methods.

[0040] The test results are shown in Table 3.

[0041] Table 3 Test results of Experiments 1-3

[0042]

[0043]

[0044] As shown in Table 3, the electrothermal film prepared by this application using a compound of crystalline tin tetrachloride, antimony trichloride, indium trichloride, nickel dichloride, silver chloride, and palladium chloride has excellent adhesion and resistivity.

[0045] Example 6

[0046] like Figure 1 As shown, this embodiment provides a nanofilm quartz heater, including a positive aluminum alloy shell 1 and a negative aluminum alloy shell 11 arranged opposite to each other, and a plurality of nanofilm heating tubes 14 located between the positive aluminum alloy shell 1 and the negative aluminum alloy shell 11 (only 3 are shown as an example in the figure, but the number of nanofilm heating tubes is not limited in practice); the surface of each nanofilm heating tube 14 is provided with a nanomaterial electrothermal film prepared in Example 4; the two ends of each nanofilm heating tube 14 are connected in series by water channel silicone 8 to form a series structure, and both ends of the series structure are provided with silicone 5, which are the water inlet end and the water outlet end, respectively.

[0047] Both the inlet and outlet ends are equipped with NTC (temperature sensor) 10 and sealed by NTC sealing ring 9; the inlet end is also equipped with a stainless steel U-tube 2, which is installed in the groove of the aluminum alloy shell 1 and connected to the inlet end via silicone connecting tube 6 and plastic water channel 7, and sealed by silicone pressure plate 4.

[0048] Each nanofilm heating tube 14 is equipped with a stainless steel spring 12 inside, and each nanofilm heating tube 14 is equipped with a copper contact clip 13 on the electrode at both ends.

[0049] The positive aluminum alloy shell 1 is also equipped with an anti-dry-burning temperature control 3.

[0050] The working principle of the nanofilm quartz heater described in this embodiment is as follows: water flows from the stainless steel U-shaped tube 2 into the silicone connecting tube 6 and the plastic water channel 7, then enters the nanofilm heating tube 14 through the inlet end. Inside the nanofilm heating tube 14, the water is heated by the nanomaterial electrothermal film, and then flows out through the outlet end, completing the heating process. The nanofilm quartz heater provided in this embodiment has excellent electrothermal efficiency.

[0051] This invention can also be implemented in various other ways. Without departing from the spirit and essence of this invention, those skilled in the art can make various corresponding changes and modifications according to this invention, but these corresponding changes and modifications should all fall within the protection scope of the appended claims.

Claims

1. A nanofilm quartz heater with an aluminum shell and heat recovery, characterized in that, It includes a positive aluminum alloy shell (1) and a negative aluminum alloy shell (11) arranged opposite to each other; a plurality of nanofilm heating tubes (14) are provided between the positive aluminum alloy shell (1) and the negative aluminum alloy shell (11); each nanofilm heating tube (14) has a nanomaterial electrothermal film on its surface; the two ends of each nanofilm heating tube are connected in series by water-channel silicone (8) to form a series structure, and the two ends of the series structure are the water inlet and the water outlet, respectively; The raw materials for the nanomaterial electrothermal film include crystalline tin tetrachloride, antimony trichloride, indium trichloride, nickel dichloride, silver chloride, and palladium chloride.

2. The nanofilm quartz heater with aluminum shell and heat recovery according to claim 1, characterized in that, Based on the total mass of the raw materials for the nanomaterial electrothermal film being 100%, the mass fraction of the crystalline tin tetrachloride is 85-95%.

3. The nanofilm quartz heater with aluminum shell and heat recovery according to claim 1, characterized in that, Based on the total mass of the raw materials for the nanomaterial electrothermal film being 100%, the mass fraction of the crystalline tin tetrachloride is 90%.

4. The nanofilm quartz heater with aluminum shell and heat recovery according to claim 1, characterized in that, The mass ratio of antimony trichloride, indium chloride, nickel chloride, silver chloride, and palladium chloride added is 6-17:0.3-1:15-20:0.5-1:2-4.

5. The nanofilm quartz heater with aluminum shell and heat recovery according to claim 4, characterized in that, The mass ratio of antimony trichloride, indium chloride, nickel chloride, silver chloride, and palladium chloride added is 3:0.16:6:0.22:

1.

6. The aluminum-cased nanofilm quartz heater with heat recovery according to claim 1, characterized in that, The preparation method of the nanomaterial electrothermal film includes: spraying the electrothermal film liquid onto the surface of the nanofilm heating tube (14) using a high-temperature furnace, thereby obtaining the film.

7. The aluminum-cased nanofilm quartz heater with heat recovery according to claim 6, characterized in that, The method for preparing the electrothermal film liquid is as follows: weigh crystalline tin tetrachloride, antimony trichloride, indium trichloride, nickel dichloride, silver chloride and palladium chloride according to the above mass percentage ratio, add them into a mixer, add ethanol, mix and heat, continuously stir and ultrasonically disperse to dissolve all solids, cool to room temperature, filter, and the electrothermal film liquid is obtained.

8. The nanofilm quartz heater with aluminum shell and heat recovery according to claim 7, characterized in that, The heating temperature is 60-80℃.

9. The aluminum-cased nanofilm quartz heater with heat recovery according to claim 1, characterized in that, The thermal conductivity of the positive aluminum alloy shell (1) and the negative aluminum alloy shell (11) is 220-260 W / m·K; the thermal conductivity of the stainless steel U-tube (2) is 20-35 W / m·K.

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