CN112361696A - Evaporator with hydrophobic coating for refrigerator and preparation method thereof - Google Patents

Abstract

The invention discloses an evaporator with a hydrophobic coating for a refrigerator and a preparation method thereof, and relates to the technical field of evaporators. The invention includes evaporator coil and evaporator fin; the surface of the evaporator fin is coated with a hydrophobic coating, and the hydrophobic coating contains graphene; slicing, punching and cleaning an aluminum sheet for later use; preparing a certain amount of graphene and ethanol into a mixed solution; putting the mixed solution into a constant-temperature ultrasonic cleaning machine for ultrasonic treatment for a minute; and (3) putting the cleaned fins into the dispersion liquid for continuing ultrasonic treatment for b minutes, taking out the fins, and drying the fins at 60 ℃ to obtain the fins with the hydrophobic coatings. According to the invention, the graphene is added in the hydrophobic coating, and the characteristics of the graphene are achieved, so that higher hydrophobicity is achieved, and a hydrophobic angle formed between the surface of the coating and a liquid drop can reach more than 110 degrees, so that water drops are not easy to stay on the solid surface, and the hydrophobic coating has the advantages of improving the hydrophobicity of the hydrophobic coating and inhibiting frosting.

Description

Evaporator with hydrophobic coating for refrigerator and preparation method thereof

Technical Field

The invention belongs to the technical field of evaporators, and particularly relates to an evaporator with a hydrophobic coating for a refrigerator and a preparation method of the evaporator.

Background

The air-cooled frostless refrigerator mostly adopts a fin evaporator, when the refrigerator operates, moisture in circulating air is separated out on the surface of fins of the evaporator, the evaporator is frozen into frost, and the dry low-temperature air passing through the evaporator is sent into a freezing chamber for refrigerating and refreshing food. Along with the continuous operation of refrigerator, the frost layer on the evaporimeter is constantly thickened, has increased the flow resistance of air in the wind channel on the one hand, and on the other hand has increased the heat transfer thermal resistance of evaporimeter and air, can form drop of water and water bridge on the fin after the defrosting, and these drop of water and water bridge form the secondary on the evaporimeter and frost, increase power consumption simultaneously. However, the existing defrosting control technology cannot directly confirm the existence of the frost layer and monitor the growth of the frost layer, so that an ideal defrosting control process is difficult to achieve, and the phenomena of 'wrong defrosting' and 'no defrosting with frost' are frequently caused by inaccurate defrosting control. In view of the above, there is a need for evaporator treatment to inhibit frost formation on the evaporator surface.

Disclosure of Invention

The invention aims to provide an evaporator of a hydrophobic coating for a refrigerator and a preparation method thereof, wherein graphene is added in the hydrophobic coating, and the graphene has the characteristics of excellent electrical conductivity, chemical stability and thermal conductivity, so that high hydrophobicity is achieved, and a hydrophobic angle formed between the surface of the coating and liquid drops can reach more than 110 degrees, so that water drops are not easy to stay on the solid surface, and the evaporator has the advantages of improving the hydrophobicity of the hydrophobic coating and inhibiting frosting.

In order to solve the technical problems, the invention is realized by the following technical scheme:

the invention relates to an evaporator with a hydrophobic coating for a refrigerator, which comprises an evaporator coil and evaporator fins; the surface of the evaporator fin is coated with a hydrophobic coating, and the hydrophobic coating contains graphene.

Further, the thickness of the graphene is 10-50 microns.

A method for preparing a hydrophobic coated evaporator for a refrigerator includes the following steps:

firstly, slicing, punching and cleaning an aluminum sheet for preparing an evaporator fin for later use;

step two, preparing a certain amount of graphene and ethanol into a mixed solution;

step three, putting the mixed solution into a constant-temperature ultrasonic cleaning machine for ultrasonic treatment for a minute;

step four, putting the cleaned fins into the dispersion liquid for continuous ultrasonic treatment for b minutes, taking out the fins, drying the fins at 60 ℃, and keeping the fins with the hydrophobic coatings for later use;

and step five, assembling the fin coated with the hydrophobic coating.

Further, the value range of the a is 4-10 minutes; the value range of b is 15-25 minutes.

The invention is based on the fact that the super-hydrophobic material is formed by the interaction degree between liquid and solid, and the included angle formed between the liquid and the solid is more than 150 degrees, so that most of water is in contact with air, the direct contact area with the solid is reduced, and the shape of the water on the surface of the solid is close to a sphere due to the tension effect of the surface of the water, and the water is not easy to stay on the surface of the solid. The principle of inhibiting frosting of the super-hydrophobic finned evaporator is similar to the principle, when the frosted water meets the finned evaporator with the super-hydrophobic coating, the frosted water is condensed into small water drops, the included angle between the water drops and the fins is more than 150 degrees, the water drops cannot stay on the fins, and the water can flow down. The hydrophobic surface has small surface energy, so that the phase change nucleation of water vapor on the surface is difficult, thereby realizing the frost inhibition and reducing the frost formation; according to the invention, the evaporator fin is subjected to coating design, and the frosting on the evaporator is inhibited and reduced through the hydrophobicity of the coating material.

The invention has the following beneficial effects:

1. according to the invention, the evaporator frosting is inhibited through the hydrophobicity of the hydrophobic coating, the coating design is carried out on the evaporator fin, and the evaporator frosting is inhibited through the hydrophobicity of the coating material, so that the problems of evaporator frosting and evaporator frosting are reduced, and the advantages of energy consumption reduction, energy saving and environmental protection are achieved.

2. According to the invention, the graphene is added in the hydrophobic coating, and the graphene has the characteristics of excellent electrical conductivity, chemical stability and thermal conductivity, so that higher hydrophobicity is achieved, and a hydrophobic angle formed between the surface of the coating and a liquid drop can reach more than 110 degrees, so that water drops are not easy to stay on the solid surface, and the hydrophobic coating has the advantages of improving the hydrophobicity of the hydrophobic coating and inhibiting frosting.

Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic view showing the structure of a hydrophobic coated evaporator for a refrigerator according to the present invention;

FIG. 2 is a schematic structural view of an evaporator fin;

FIG. 3 is a schematic structural view of an evaporator fin coating;

in the drawings, the components represented by the respective reference numerals are listed below:

1-evaporator coil, 2-evaporator fin, 3-hydrophobic coating.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "opening," "upper," "lower," "thickness," "top," "middle," "length," "inner," "peripheral," and the like are used in an orientation or positional relationship that is merely for convenience in describing and simplifying the description, and do not indicate or imply that the referenced component or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be considered as limiting the present invention.

Referring to fig. 1-3, the present invention relates to an evaporator of hydrophobic coating for refrigerator and a method for preparing the same, the evaporator includes an evaporator coil 1 and an evaporator fin 2; the surface of the evaporator fin 2 is coated with a hydrophobic coating 3, and the hydrophobic coating 3 contains graphene.

Preferably, the graphene has a thickness of 10-50 microns.

A method for preparing a hydrophobic coated evaporator for a refrigerator includes the following steps:

firstly, slicing, perforating and cleaning an aluminum sheet for preparing the evaporator fin 2 for later use;

step two, preparing a certain amount of graphene and ethanol into a mixed solution;

step three, putting the mixed solution into a constant-temperature ultrasonic cleaning machine for ultrasonic treatment for a minute;

step four, putting the cleaned fins into the dispersion liquid for continuous ultrasonic treatment for b minutes, taking out the fins, drying the fins at 60 ℃, and keeping the fins with the hydrophobic coatings for later use;

and step five, assembling the fin coated with the hydrophobic coating.

Preferably, a ranges from 4 to 10 minutes; the value range of b is 15-25 minutes.

The invention is based on the fact that the super-hydrophobic material is formed by the interaction degree between liquid and solid, and the included angle formed between the liquid and the solid is more than 150 degrees, so that most of water is in contact with air, the direct contact area with the solid is reduced, and the shape of the water on the surface of the solid is close to a sphere due to the tension effect of the surface of the water, and the water is not easy to stay on the surface of the solid. The principle of inhibiting frosting of the super-hydrophobic finned evaporator is similar to the principle, when the frosted water meets the finned evaporator with the super-hydrophobic coating, the frosted water is condensed into small water drops, the included angle between the water drops and the fins is more than 150 degrees, the water drops cannot stay on the fins, and the water can flow down. The hydrophobic surface has small surface energy, so that the phase change nucleation of the water vapor on the surface is difficult, namely the phase change nucleation of the water vapor on the surface is difficult, thereby realizing the frost inhibition and reducing the frost formation; according to the invention, the evaporator fin is subjected to coating design, and the frosting on the evaporator is inhibited and reduced through the hydrophobicity of the coating material.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims (4)

1. A hydrophobic coated evaporator for a refrigerator, the evaporator comprising an evaporator coil (1) and an evaporator fin (2); the surface of the evaporator fin (2) is coated with a hydrophobic coating (3), and the evaporator fin is characterized in that: the hydrophobic coating (3) contains graphene.

2. The hydrophobic-coated evaporator for a refrigerator as claimed in claim 1, wherein the graphene has a thickness of 10-50 μm.

3. The method for preparing a hydrophobic coated evaporator for a refrigerator according to claim 1, comprising the steps of:

firstly, slicing, punching and cleaning an aluminum sheet for preparing the evaporator fin (2) for later use;

step two, preparing a certain amount of graphene and ethanol into a mixed solution;

step three, putting the mixed solution into a constant-temperature ultrasonic cleaning machine for ultrasonic treatment for a minute;

step four, putting the cleaned fins into the dispersion liquid for continuous ultrasonic treatment for b minutes, taking out the fins, drying the fins at 60 ℃, and keeping the fins with the hydrophobic coatings for later use;

and step five, assembling the fin coated with the hydrophobic coating.

4. The method of claim 1, wherein a is selected from a range of 4 to 10 minutes; the value range of b is 15-25 minutes.

Images