CN212029987U - Refrigerator defrosting device - Google Patents

Abstract

The utility model discloses a refrigerator defrosting device, which relates to the technical field of refrigerators. The utility model comprises an evaporator; the evaporator comprises fins and a refrigeration pipeline; the surfaces of the fins and the refrigeration pipeline are coated with a graphene heat dissipation slurry layer; a temperature sensor is installed above the evaporator; A support is installed; the side of the support facing the evaporator is attached with a graphene heating film; the surface area of the graphene heating film is greater than or equal to the projected area of the side of the evaporator; the graphene heating film is connected with the control board through wires and temperature fuses. The utility model improves the heat absorption capacity by coating graphene heat dissipation slurry on the evaporator refrigerating pipeline and the fins, and installs the graphene heating film between the evaporator and the inner liner of the refrigerator to improve the heat radiation performance of the evaporator; The existing refrigerator has the problems of slow defrosting speed and high energy consumption.

Description

A refrigerator defrosting device

technical field

The utility model belongs to the technical field of refrigerators, in particular to a refrigerator defrosting device.

Background technique

Refrigerator defrosting is a problem that must be considered in the refrigerator control system, especially in the air-cooled refrigerator control system. When the refrigerator is refrigerated normally, due to the low temperature of the evaporator (generally about -30°C) and the relatively high temperature of the surrounding air, the water vapor in the air will gradually condense into a frost layer on the surface of the evaporator. If the frost layer is too thick, the cooling efficiency will decrease and the energy consumption will increase.

At present, the frost-free refrigerators on the market generally use the method of installing a steel tube heater at the bottom of the fin evaporator to defrost. This defrosting method uses the electric heating of the steel pipe heater, and transfers the heat of the steel pipe heater to the frost layer by means of heat radiation and heat convection. The heat transfer effect of thermal radiation is related to the surface material of the heat-absorbing object and the distance from the heat source. For objects that absorb heat, the darker the color, the more heat it absorbs, and the lighter the color, the less heat it absorbs; the closer the distance, the more heat it absorbs, and the farther it is, the less heat it absorbs.

The surface color of the finned evaporator currently used in the industry is silver-white, and the absorption capacity of heat is poor. For example, China Practical CN201822105777.0 discloses a refrigeration equipment. By installing a heating plate between the tank and the evaporator, Shorten the distance between the heating source and the frost layer to improve the defrosting efficiency. However, the ability of heat-absorbing objects such as evaporators to absorb heat itself has not been improved.

Secondly, since the steel tube heater is installed at the bottom of the evaporator, it is far away from the frost layer on the top of the evaporator. The above two reasons lead to the slow defrosting speed and high energy consumption of the finned evaporator. For example, Chinese utility model CN201821297682.7 discloses a surface heater for refrigerator defrosting. By replacing the steel pipe heater at the bottom of the evaporator with a heating surface, the defrosting efficiency is improved, but the bottom of the evaporator is narrow. , the heating area is small, so the effect is still not obvious after changing to the heating surface.

At the same time, the defrosting program control method of the existing refrigerator also has shortcomings. For example, in the refrigerator defrosting control method disclosed in Chinese utility model CN201610761987.8, it is determined by judging the different states of the compressor before entering the defrosting process. Defrost mode. The difference between the two defrosting modes is that the compressor running time and the natural defrosting time are different. By reasonably selecting different defrosting modes, the purpose of speeding up the defrosting process of the refrigerator is achieved. No improvements have been made to source utilization.

Therefore, there is an urgent need to improve the existing refrigerator defrosting device to improve the defrosting efficiency and save the energy consumption generated by the defrosting.

Utility model content

The purpose of this utility model is to provide a refrigerator defrosting device, which can improve the heat absorption capacity by coating graphene heat dissipation slurry on the evaporator refrigeration pipeline and fins, and install a graphene heating film between the evaporator and the inner tank of the refrigerator. The heat radiation performance of the evaporator is improved; the problems of slow defrosting speed and high energy consumption of the existing refrigerator are solved.

In order to solve the above-mentioned technical problems, the utility model is realized through the following technical solutions:

The utility model relates to a refrigerator defrosting device, comprising an evaporator, a temperature fuse and a control board; the evaporator comprises fins and a refrigeration pipeline; the surfaces of the fins and the refrigeration pipeline are coated with graphene heat-dissipating slurry material layer; a heat-resistant layer or a support is provided between the evaporator and the inner liner of the refrigerator; a graphene heating film is attached to one side of the heat-resistant layer or support toward the evaporator; the surface area of the graphene heating film Greater than or equal to the side projected area of the evaporator.

Further, the thickness of the graphene heat dissipation slurry layer is 5-15 μm.

Further, the thickness of the graphene heat dissipation slurry layer is 7-10 μm.

Further, a foam layer or an infrared reflection film is arranged between the support and the inner liner of the refrigerator.

Further, the graphene heating film is connected in series with the control board through a wire and a temperature fuse.

Further, a temperature sensor is installed above the evaporator.

Further, a reflector plate is fixedly connected to the heat-resistant layer or the support.

Further, the reflector plate has a horn-shaped structure, and the flared end faces the evaporator, and the narrowed end is adapted to the surrounding sides of the support.

Further, an infrared reflection film is attached to the inner wall of the reflection cover plate.

A control method for defrosting a refrigerator, comprising the following steps:

Step 1: After entering the defrosting program, the system first stops the work of the compressor, fan motor and other related electrical components;

Step 2: electrify the graphene heating film to defrost the frost layer of the evaporator;

Step 3: During the defrosting period, the temperature sensor is used to detect whether the temperature reaches the preset temperature value, if so, go to Step 5; if not, go to Step 4;

Step 4: During defrosting, confirm whether the accumulated defrosting time reaches the preset time, if so, go to Step 5; if not, go back to Step 3;

Step 5: End the defrosting, wait for a few minutes, and the refrigerator will enter the normal refrigeration program according to the current state.

The utility model has the following beneficial effects:

1. The utility model improves the heat absorption capacity by coating the graphene heat dissipation slurry on the evaporator refrigeration pipeline and the fins, effectively improving the evaporator's heat absorption capacity during defrosting, and is conducive to improving the defrosting efficiency.

2. The utility model installs a graphene heating film between the evaporator and the inner liner of the refrigerator, and through the good thermal radiation performance of the graphene heating film, the heat can be quickly transferred to the evaporator, thereby effectively improving the defrosting efficiency of the refrigerator. and energy utilization, which is conducive to reducing the energy consumption of products.

Of course, any product implementing the present invention does not necessarily need to simultaneously achieve all of the above-mentioned advantages.

Description of drawings

In order to illustrate the technical solutions of the embodiments of the present invention more clearly, the accompanying drawings required for the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained from these drawings without creative effort.

Fig. 1 is the structural representation of a kind of refrigerator defrosting device of the present invention;

Figure 2 is a schematic structural diagram of a support;

3 is a schematic flowchart of a control method for defrosting a refrigerator according to the present invention;

In the accompanying drawings, the list of components represented by each number is as follows:

1-fin, 2-refrigeration pipeline, 3-support, 4-temperature fuse, 5-control board, 101-temperature sensor, 301-graphene heating film, 302-reflector plate.

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the implementations. example. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

In the description of the present invention, it should be understood that the terms "opening", "upper", "lower", "thickness", "top", "middle", "length", "inside", "surrounding" It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the components or elements referred to must have a specific orientation, are constructed and operated in a specific orientation, and therefore cannot be understood as a reference to the present utility model. New type of restriction.

Example 1

Please refer to FIG. 1, the utility model is a refrigerator defrosting device, including an evaporator; the evaporator includes fins 1 and a refrigeration pipeline 2; the surfaces of the fins 1 and the refrigeration pipeline 2 are coated with graphene heat dissipation slurry material layer, and the thickness of the graphene heat dissipation slurry layer is 5-15 μm or 7-10 μm, such as 10 μm.

A temperature sensor 101 is installed above the evaporator; a heat-resistant layer or a support 3 is installed between the evaporator and the inner liner of the refrigerator, and the support 3 can be a plate-like component, such as a glass plate or a ceramic plate, and the heat-resistant layer can be a resin layer . The heat-resistant layer or the support 3 can be installed and fixed by screwing or snap-fitting.

A graphene heating film 301 is attached to the side of the heat-resistant layer or support 3 facing the evaporator, and the surface area of the graphene heating film 301 is greater than or equal to the side projected area of the evaporator, so that the heat generated by the graphene heating film 301 can cover the entire evaporation At the same time, the graphene heating film 301 is placed between the evaporator and the inner tank of the refrigerator to reduce the distance between the heating source and the frost layer, the utilization rate of heat energy and the defrosting efficiency.

At the same time, a foam layer can also be arranged between the support 3 and the inner container of the refrigerator, or an infrared reflective film can be attached to the inner container of the refrigerator, so as to prevent the heat generated by the graphene heating film 301 from being transferred to the inner container of the refrigerator through the support 3, preventing Influence on the internal temperature of the refrigerator compartment.

The graphene heating film 301 is connected to the control board 5 through a wire and a temperature fuse 4. The temperature fuse 4 may have problems in the defrosting control system. , The temperature fuse 4 is blown, and the heater power is disconnected, thereby stopping the heating and realizing the protection function.

At the same time, the temperature sensor 101 can sense the temperature of the air around the evaporator, and determine the condition for the defrosting function to be withdrawn. If the defrosting heating exit temperature is set to 8°C, when the temperature sensor 101 detects that the temperature around the evaporator reaches 8°C, the refrigerator stops defrosting.

As shown in Figure 3, a control method for defrosting a refrigerator, when the refrigerator enters the defrosting program, the defrosting program starts to run, and the operating rules are as follows:

Step 1: After entering the defrosting program, the system first stops the work of the compressor, fan motor and other related electrical components;

Step 2: energize the graphene heating film 301 to defrost the frost layer of the evaporator;

Step 3: During the defrosting period, the temperature sensor 101 is used to detect whether the temperature reaches a preset temperature value, such as 8°C, if yes, go to step five; if not, go to step four;

Step 4: During the defrosting period, confirm that the accumulated defrosting time reaches the preset time, such as 10 minutes, if yes, go to Step 5; if not, go back to Step 3;

Step 5: Disconnect the power supply of the graphene heating film 301, end the defrosting, and wait for a period of time, the refrigerator enters the normal refrigeration process according to the current state. Wait a while, like 5 minutes, 8 minutes or 10 minutes. The purpose is to allow the water droplets on the evaporator to completely drop into the water receiving tray outside the refrigerator box, so as to avoid water droplets remaining on the evaporator.

Embodiment 2

As shown in FIG. 2 , on the basis of the first embodiment, the support 3 is fixedly connected with a reflector plate 302 , and the reflector plate 302 can be a metal part or a plastic part, or an integral structure with the support 3 .

The reflector plate 302 is a horn-shaped structure, and the flared end of the reflector plate 302 faces the evaporator, and the constricted end is adapted to the surrounding sides of the support 3, which can be fixed by snap connection or interference fit. The inner wall of the reflector plate 302 The infrared reflective film is attached, and the heat generated by the graphene heating film 301 can be reflected to the evaporator through the infrared reflective film. The horn-shaped structure enables the heat to be concentrated on the evaporator after being reflected, which further improves the defrosting efficiency.

In the description of this specification, description with reference to the terms "one embodiment", "example", "specific example", etc. means that a specific feature, structure, material or characteristic described in connection with the embodiment or example is included in the present invention. in at least one embodiment or example. In this specification, schematic representations of the above terms 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 present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details, nor do they limit the invention to only the described embodiments. Obviously, many modifications and variations are possible in light of the contents of this specification. This specification selects and specifically describes these embodiments in order to better explain the principle and practical application of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is limited only by the claims and their full scope and equivalents.

Claims (9)

1. A refrigerator defrosting device, comprising an evaporator, a temperature fuse (4) and a control board (5); the evaporator comprises a fin (1) and a refrigeration pipeline (2); the fin (1) ) and the surface of the refrigeration pipeline (2) are all coated with a graphene heat dissipation slurry layer; It is characterized by: A heat-resistant layer or a support (3) is arranged between the evaporator and the inner liner of the refrigerator; a graphene heating film (301) is attached to one side of the heat-resistant layer or the support (3); The surface area of the graphene heating film (301) is greater than or equal to the side projected area of the evaporator. 2 . The refrigerator defrosting device according to claim 1 , wherein the thickness of the graphene heat dissipation slurry layer is 5-15 μm. 3 . 3 . The refrigerator defrosting device according to claim 1 , wherein the thickness of the graphene heat dissipation slurry layer is 7-10 μm. 4 . 4 . The refrigerator defrosting device according to claim 1 , wherein a foam layer or an infrared reflection film is arranged between the support ( 3 ) and the inner liner of the refrigerator. 5 . 5 . A refrigerator defrosting device according to claim 1 , wherein the graphene heating film ( 301 ) is connected in series with the control board ( 5 ) through a wire and a temperature fuse ( 4 ). 6 . 6. A refrigerator defrosting device according to claim 1, wherein a temperature sensor (101) is installed above the evaporator. 7 . The refrigerator defrosting device according to claim 1 , wherein the support ( 3 ) is fixedly connected with a reflector plate ( 302 ). 8 . 8 . The refrigerator defrosting device according to claim 7 , wherein the reflector plate ( 302 ) has a horn-shaped structure, and the flared end faces the evaporator, and the narrowed end is connected to a heat-resistant layer or a support. 9 . Object (3) is fitted around the sides. 9 . The refrigerator defrosting device according to claim 8 , wherein an infrared reflective film is attached to the inner wall of the reflecting cover plate ( 302 ). 10 .

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