CN218915527U - Defrosting heater and refrigerator - Google Patents

Abstract

The utility model discloses a defrosting heater, and discloses a refrigerator with the defrosting heater, wherein the defrosting heater comprises: the device comprises a shell, a carbon fiber heating body and an insulating heat-conducting material, wherein the shell is a metal piece; the carbon fiber heating body is arranged in the shell; the insulating heat-conducting material is filled between the carbon fiber heating body and the shell. Through increasing the filler between shell and carbon fiber heat-generating body, the filler comprises insulating heat conduction material, and the shell can adopt metalwork such as steel pipe, and metalwork such as steel pipe heat conductivility is more excellent, and efficiency is higher, can further promote defrosting heater's electric heat conversion efficiency.

Description

Defrosting heater and refrigerator

Technical Field

The utility model relates to the technical field of refrigeration equipment, in particular to a defrosting heater and a refrigerator.

Background

In the related art, an air-cooled refrigerator mainly adopts a heater to electrically heat and defrost. At present, most of defrosting heaters are electric heating alloy heating, such as common steel tube defrosting heaters, and the materials are iron-chromium-aluminum alloy or nickel-chromium alloy, so that the comprehensive electric heating conversion rate is low, the density of metal materials is high, and the heater components are heavy, so that the product weight is not facilitated. In addition, the nichrome is easy to generate oxidation reaction in the air to blow in a hot state; and if the material is used in a spiral state, the electromagnetic property of the material generates inductive reactance effect when the material is electrified. The Fe-Cr-Al alloy has low high temperature strength, and the plasticity of the Fe-Cr-Al alloy is increased along with the increase of the use temperature, so that the element is easy to deform and not easy to bend and repair. In the related art, carbon fibers are adopted to replace the materials, namely, a heating unit consisting of the carbon fibers stored in the glass tube is adopted, so that the electrothermal conversion efficiency of the heater is well improved, but the electrothermal conversion efficiency is also improved.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides the defrosting heater, which can further improve the electrothermal conversion efficiency of the heater.

The utility model also provides a refrigerator with the defrosting heater.

A defrost heater according to an embodiment of the first aspect of the present utility model includes: the device comprises a shell, a carbon fiber heating body and an insulating heat-conducting material, wherein the shell is a metal piece; the carbon fiber heating body is arranged in the shell; the insulating heat-conducting material is filled between the carbon fiber heating body and the shell.

The defrosting heater provided by the embodiment of the utility model has at least the following beneficial effects: through increasing the filler between shell and carbon fiber heat-generating body, the filler comprises insulating heat conduction material, and the shell can adopt metalwork such as steel pipe, and metalwork such as steel pipe heat conductivility is more excellent, and efficiency is higher, can further promote defrosting heater's electric heat conversion efficiency.

According to some embodiments of the utility model, the insulating and thermally conductive material is thermally conductive silica gel or magnesium oxide.

According to some embodiments of the utility model, the carbon fiber heating body is in the shape of a wire, a tube, a sheet, or a sphere.

According to some embodiments of the utility model, the defrosting heater includes a plurality of the carbon fiber heating bodies.

According to some embodiments of the utility model, the plurality of carbon fiber heating elements are divided into a first portion and a second portion, the first portion being located in an axial region of the housing, the second portion surrounding the first portion.

According to some embodiments of the utility model, the defrosting heater comprises two wiring terminals, the wiring terminals are electrically connected with the carbon fiber heating body, and the two wiring terminals are respectively arranged at two ends of the shell.

A refrigerator according to an embodiment of a second aspect of the present utility model includes the defrost heater of the embodiment of the first aspect of the present utility model.

The refrigerator provided by the embodiment of the utility model has at least the following beneficial effects: by adopting the defrosting heater of the embodiment of the first aspect of the utility model, the shell of the defrosting heater can adopt metal parts such as steel pipes, the heat conduction performance of the metal parts such as the steel pipes is better, the efficiency is higher, the electrothermal conversion efficiency of the defrosting heater can be further improved, and the defrosting efficiency of the refrigerator is further improved.

Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.

Drawings

The utility model is further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a schematic view of a defrost heater in accordance with an embodiment of the present utility model;

FIG. 2 isbase:Sub>A sectional view A-A shown in FIG. 1;

fig. 3 is a schematic diagram of a defrosting heater according to an embodiment of the present utility model applied to a refrigerator;

fig. 4 is a schematic structural view of a refrigerator according to an embodiment of the present utility model.

Reference numerals:

100. a defrosting heater; 101. a housing; 102. a connection terminal;

201. a carbon fiber heating element; 202. an insulating thermally conductive material;

301. a condenser; 302. a compressor; 303. a throttle device; 304. a filter; 305. an air return pipe; 306. an evaporator; 307. a power supply; 308. a control circuit board;

401. a case; 402. an air duct member; 403. a storage compartment; 404. an evaporation chamber; 405. an air inlet; 406. and (5) an air return port.

Detailed Description

Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.

In the description of the present utility model, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present utility model and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present utility model.

In the description of the present utility model, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.

In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.

The refrigerator refrigerating system is mainly divided into four parts: the device comprises an evaporator, a condenser, a compressor and a throttling device, wherein the evaporator is a device for providing cold energy, and a refrigerant absorbs heat and evaporates in the evaporator to reduce the air temperature. Since the evaporator temperature is lower than the air dew point temperature, moisture in the air will continuously condense into frost on the evaporator. When the frosting amount increases, the heat transfer efficiency of the evaporator is deteriorated, the refrigerating effect is deteriorated, and the power consumption is increased.

Most of the refrigerators in the market at present are air-cooled refrigerators, and most of the air-cooled refrigerators adopt an electric heating defrosting mode, an electric heating pipe is arranged below an evaporator, and a frost layer is heated by heating air.

In the current defrosting mode of air-cooled refrigerator products, the steel tube heater is mainly used for electric heating defrosting, and the material of the steel tube heater is iron-chromium-aluminum alloy or nickel-chromium alloy and the like. The method is characterized in that:

1. when the heating alloy materials such as nickel and chromium are electrified to generate heat, electric energy is converted into heat energy, light energy and the like, the comprehensive electrothermal conversion rate is about 60 to 90 percent, and the efficiency is improved;

2. the metal material has a relatively high density and the heater element has a relatively high weight (e.g., nichrome has a density of about 8 to 8.5 g/cm) ³ ) The product is not easy to be light;

3. the nickel-chromium alloy is in a very high temperature (hot state) under the working state, and is easy to generate oxidation reaction in the air to blow; and if the material is used in a spiral state, the electromagnetic property of the material generates inductive reactance effect when the material is electrified;

4. the iron-chromium-aluminum alloy has low strength under the high temperature condition, the plasticity of the iron-chromium-aluminum alloy is increased along with the increase of the using temperature, and the element is easy to deform and difficult to bend and repair.

In summary, the materials of the conventional defrosting heater have many aspects such as energy saving, light weight, reliability and the like, and there is room for improvement.

In the related art, carbon fibers are adopted to replace the materials, wherein the carbon fibers refer to high-strength high-modulus fibers with carbon content of more than 90 percent, and the high-temperature resistant fibers are the first of all chemical fibers. As a novel high-performance material, the carbon fiber has the excellent characteristics of high efficiency, energy conservation and no pollution, and is widely applied to the fields of daily use and industrial heating. The carbon fiber material is applied to the defrosting heater, so that the electrothermal conversion efficiency of the heater is improved, and the energy is saved and the consumption is reduced; meanwhile, the heater has the advantages of health, environment friendliness, light weight, safety (no arcing after wire breakage), stable chemical property, long service life and the like.

In one embodiment, the defrost heater comprises a glass portion comprised of a single quartz glass tube, the glass portion having a generally U-shape comprised of two straight tube portions and a top portion folded 180 degrees. I.e. the glass portion is folded 180 degrees into a substantially U-shape in the central region and the interior of the glass portion. The defrosting heater is provided with a heating element made of carbon fiber and wiring terminals electrically connected to the heating element and attached to both ends of the glass part. A sealing member made of silicone or the like is filled between the glass portion and the two wiring terminals to keep the inside of the glass portion airtight. The outside of the glass portion where the two wiring terminals are located is covered with a sealing member. An external wiring for supplying power to the heating element is electrically connected to the wiring terminal.

In the above embodiment, in order to prevent electric leakage, the glass portion is used as the outer protective cover, and the glass portion has an insulating property, so that an effect of preventing electric leakage can be achieved. When a heating element made of carbon fiber is started, the heating element emits light in the infrared region, and the light in the infrared region has a characteristic of easily passing through quartz glass. In particular, in the present embodiment, since the glass portion is glass having a single structure, energy loss when passing through the glass portion can be suppressed. In addition, light having a wavelength of 2 to 4 μm in the infrared region overlaps with a peak (approximately 3 μm) of the absorption spectrum of water, and thus has a characteristic that water can be heated at a high speed.

It will be appreciated that in other embodiments, the glass portion may be replaced with a thermally conductive silicone, which also has insulating properties. However, in terms of electrothermal conversion efficiency, the heat conductive properties of the glass part and the heat conductive silica gel are inferior to those of metal members such as steel pipes, and thus electrothermal conversion efficiency of the defrosting heater is also limited.

Next, with reference to fig. 1 to 4, how the defrosting heater 100 according to the embodiment of the present utility model solves the above technical problems will be described.

Referring to fig. 1 and 2, it can be understood that the defrosting heater 100 of the embodiment of the present utility model includes a case 101, a carbon fiber heating body 201, and an insulating heat conductive material 202. The housing 101 is made of a metal workpiece, for example, the housing 101 may be formed of a steel pipe. The housing 101 is used as a carrier for accommodating the carbon fiber heating element 201, the housing 101 is provided with an inner cavity or bore, and the carbon fiber heating element 201 is arranged inside the housing 101. In order to prevent leakage, the shell 101 is further filled with an insulating and heat-conducting material 202, and the insulating and heat-conducting material 202 separates the carbon fiber heating element 201 from the inner wall of the shell 101, so that an anti-leakage effect is achieved. In order to improve the electrothermal conversion efficiency, the insulating and heat conducting material 202 also has a heat conducting function, that is, the insulating and heat conducting material 202 can conduct the heat generated by the carbon fiber heating body 201 to the casing 101, so that the electrothermal conversion efficiency of the defrosting heater 100 can be further improved by utilizing the excellent heat conducting property and heating efficiency of the metal piece.

It can be appreciated that the carbon fiber heating element 201 includes a carbon fiber heating wire, which is a reinforced plastic composite material made of carbon fiber, and has many excellent properties of high strength, high modulus, high temperature resistance, wear resistance, fatigue resistance, corrosion resistance, creep resistance, electrical conductivity, thermal conductivity, and the like. It can reduce the weight of the component, so that the technical performance of the component is improved. Carbon fiber is used as an electrothermal body, and therefore, has a plurality of excellent performances which are incomparable with those of an electrothermal body such as metal, PTC and the like. For example, the carbon fiber heating body 201 heats up quickly, the electrothermal conversion efficiency is high, and the electric energy is saved; the carbon fiber electrothermal body is a full blackbody material, the electrothermal conversion efficiency is improved by 30% compared with metal heating, and the electrothermal efficiency is about 100%. The tensile strength of the carbon fiber is 6 to 10 times higher than that of the wire at the same allowable current load area. Moreover, the carbon fiber heating body 201 is broken to avoid arcing, so that the occurrence of fire can be effectively avoided. In addition, the carbon fiber heating body 201 is light in weight, and the weight of the member is effectively reduced, so that the technical performance of the member is improved. The carbon fiber heating element 201 has stable chemical property, corrosion resistance and difficult oxidation. The defects of low strength and easy oxidation and blowing of the metal wire, PTC and silicon carbide electric heater are overcome under the electric heating state. The carbon fiber heating element 201 has a long service life, almost the same as that of a building.

It can be appreciated that the carbon fiber heating element 201 may be a carbon fiber electric heating tube, which is a high-tech product different from a traditional electric heating tube such as a metal wire, halogen, etc., and has the advantages of long service life, high electric heating conversion efficiency, far infrared radiation, health, environmental protection, etc. The carbon fiber is a pure blackbody material, and has very small visible light and electric heat conversion efficiency of more than 95% in the electric-heat conversion process. Compared with the heater using nickel-chromium, tungsten-molybdenum and other materials as heating elements, the heater can save energy by 30 percent. And far infrared rays emitted by the carbon fiber electric heating tube are easy to be directly absorbed by objects, so that the far infrared rays are extremely strong, the heat loss is small in the heat transfer process, and the energy conservation is strong. In addition, the carbon fiber electric heating tube does not need a ballast, and no pulse current impact is generated during starting, so that a lighting power supply and a protection circuit are simplified, and the service lives of the lighting power supply and related electric appliances are prolonged. The carbon fiber electric heating tube has high heat radiation direction, and can improve the design and direct heat radiation. In addition, the carbon fiber electric heating tube has no pollution, does not irritate eyes and burn skin, does not have ultraviolet radiation and harmful gas, does not have high-frequency radiation (only far infrared radiation), does not have microwaves and electromagnetic waves, and has the property of absorbing harmful light waves.

It will be appreciated that the insulating and thermally conductive material 202 may be a thermally conductive silicone, which is a high-end thermally conductive compound, and will not solidify and will not be electrically conductive, so that risks such as short circuits are avoided. The heat conducting silica gel contacts the heating surface of the carbon fiber heating body 201 and then is conducted to the radiating surface of the shell 101, thereby playing the role of heat transfer medium and the performances of dampproof, dustproof, anticorrosion, shockproof and the like.

It should be noted that, the insulating and heat conducting material 202 may also be made of other materials, such as magnesium oxide, which meet the insulating and heat conducting requirements.

Referring to fig. 1 and 2, it is understood that the shape of the carbon fiber heating element 201 is a line, and in this case, the housing 101 may be a hollow cylinder, or may be a straight cylinder structure, the carbon fiber heating element 201 is disposed in the tube hole of the housing 101 in a penetrating manner, and then the insulation heat conductive material 202 fills the remaining space of the tube hole. Of course, the housing 101 may be plate-shaped, U-shaped, or the like.

It should be noted that, the insulating and heat conducting material 202 may completely fill the tube hole of the housing 101, or the insulating and heat conducting material 202 may be divided into multiple segments and arranged at intervals, so that the housing 101 and the carbon fiber heating element 201 may be separated.

The defrost heater 100 may be tubular, sheet-like or spherical in shape.

Referring to fig. 1, it can be understood that the defrosting heater 100 includes two connection terminals 102, the connection terminals 102 being electrically connected to the carbon fiber heating body 201, the two connection terminals 102 being respectively mounted at both ends of the housing 101. The connection terminal 102 is used to connect external wiring to thereby realize power supply to the defrost heater 100.

Referring to fig. 2, it can be understood that the defrosting heater 100 includes a plurality of carbon fiber heat generating bodies 201, and the amount of heat generation can be increased by providing the plurality of carbon fiber heat generating bodies 201, thereby further improving defrosting efficiency. It is understood that the plurality of carbon fiber heating bodies 201 can be separated by the insulating heat conducting material 202, so that the risk of short circuit is reduced.

Referring to fig. 2, it can be understood that the plurality of carbon fiber heat-generating bodies 201 are arranged in a circumferential array, and the plurality of carbon fiber heat-generating bodies 201 are divided into two parts, i.e., a first part and a second part. Wherein the first portion is located in an axial region of the housing 101, i.e. a central region, and the second portion is distributed around a circumferential direction of the first portion. In this way, the plurality of carbon fiber heating bodies 201 can effectively utilize the space of the housing 101, the inner and outer carbon fiber heating bodies 201 work simultaneously, the heating value can be increased, and meanwhile, heat can be transferred to the housing 101 from a plurality of directions, so that the heat transfer efficiency is improved.

In other embodiments, the plurality of carbon fiber heating elements 201 may be arranged in a rectangular array or in a linear shape.

It can be appreciated that the refrigerator according to the embodiment of the present utility model includes the defrosting heater 100 according to the embodiment of the present utility model, and since all technical features of the defrosting heater 100 according to the embodiment of the present utility model are provided, all advantageous effects of the defrosting heater 100 according to the embodiment of the present utility model are also provided, and will not be described herein.

Referring to fig. 3, it can be appreciated that in one embodiment, the refrigerator includes a refrigeration system including an evaporator 306, a condenser 301, a compressor 302, a throttle device 303, and an exhaust port of the compressor 302, the condenser 301, the throttle device 303, the evaporator 306, and an intake port of the compressor 302 are connected to each other to form a refrigeration circuit. Wherein the evaporator 306 and the air inlet of the compressor 302 are in communication via an air return pipe 305. The defrosting heater 100 is located near the evaporator 306, the defrosting heater 100 is connected to a control circuit, and current is generated in the control circuit, and the defrosting heater 100 generates heat through the defrosting heater 100, and then the evaporator 306 is heated again, so that the defrosting purpose is achieved. In addition to the defrost heater 100, a power supply 307 and a control circuit board 308 are provided in the control circuit.

It is understood that a filter 304 may be further disposed between the condenser 301 and the throttling device 303, and the throttling device 303 may employ components such as a capillary tube and a throttle valve. The filter 304 is capable of filtering out contaminants in the refrigeration system, such as metal shavings, various oxides, dust, etc., to prevent the contaminants from clogging capillaries or damaging the compressor 302.

Referring to fig. 4, it can be understood that the refrigerator includes a cabinet 401 and a duct part 402. Wherein the box 401 is provided with a cavity, the air channel component 402 is positioned in the cavity, and the air channel component 402 divides the cavity into two parts, namely a storage compartment 403 and an evaporation cavity 404. The air duct part 402 is also provided with an air return channel and an air inlet channel, the air inlet channel is communicated with the storage compartment 403 and the evaporation cavity 404, and the air return channel is also communicated with the storage compartment 403 and the evaporation cavity 404. The air inlet channel is provided with an air inlet 405 and the return air channel is provided with an air return 406. Wherein the evaporator 306 is located within the evaporation chamber 404 and the defrost heater 100 is located below the evaporator 306 to heat the evaporator 306.

The defrosting heater 100 may be located above or on the side of the evaporator 306, as long as the evaporator 306 can be heated and the defrosting effect can be achieved.

It should be noted that, the defrosting heater 100 is assembled to the evaporator 306 to form an integrated structure, so that the relative positional relationship between the defrosting heater 100 and the evaporator 306 is conveniently fixed, and the temperature control is more accurate. Of course, the defrost heater 100 may be disposed at other locations inside and outside the refrigerator.

The defrosting heater 100 may be applied to a drain pipe, an air duct, and other parts of a refrigerator to defrost by heating, and is not particularly limited herein.

The embodiments of the present utility model have been described in detail with reference to the accompanying drawings, but the present utility model is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present utility model.

Claims (10)

1. Defrosting heater, its characterized in that includes:

the shell is a metal piece;

the carbon fiber heating body is arranged in the shell;

and the insulating heat conducting material is filled between the carbon fiber heating body and the shell.

2. The defrost heater of claim 1, wherein the insulating thermally conductive material is thermally conductive silica gel or magnesium oxide.

3. The defrosting heater as set forth in claim 1, wherein the carbon fiber heat generating body is in the shape of a wire, a tube, a sheet or a sphere.

4. The defrost heater of claim 1, wherein the defrost heater comprises a plurality of the carbon fiber heat generators.

5. The defrosting heater of claim 4 wherein the plurality of carbon fiber heating bodies are divided into a first portion and a second portion, the first portion being located in an axial region of the housing, the second portion surrounding the first portion.

6. The defrosting heater of claim 1 wherein the defrosting heater comprises two connection terminals electrically connected to the carbon fiber heating body, the two connection terminals being mounted at both ends of the housing, respectively.

7. A refrigerator including the defrosting heater of any one of claims 1 to 6.

8. The refrigerator of claim 7, wherein the defrost heater is for heating at least one of an evaporator, a drain pipe, and a duct.

9. The refrigerator of claim 7, wherein the defrost heater is located below, above or to the side of the evaporator.

10. The refrigerator of claim 7, wherein the defrost heater is assembled to the evaporator to form an integrated structure.

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