A defrosting heater with high efficiency for air-cooled refrigerator

Abstract

The application discloses a defrosting heater with high efficiency for air-cooled refrigerator, which is embedded with finned evaporator and comprises aluminum tube heaters, steel tube heaters and wires. The aluminum tube heaters comprise two tubes which are connected in parallel through the wires. The steel tube heaters also comprise two tubes which are connected in parallel through the wires. The two parallel aluminum tube heaters and the two parallel steel tube heaters are connected in parallel through the wires. The three-wire parallel connection of the 0.42mm diameter nickel-chromium alloy electric heating wire meets the requirements of the super-low resistance (less than 1Ω) high-power heating tube which is made of the conventional nickel-chromium alloy wire and the 6.6mm diameter 304 stainless steel tube. The super-low resistance high-power heating tube is assembled at the lower part of the finned evaporator, and the low-power aluminum tube heater is embedded at the upper half of the finned evaporator, so that the combined heating is realized. The air-cooled refrigerator can meet the use of high-power heating defrosting under the condition of 12V low voltage. The 150W power heating under the 12V voltage can reach the defrosting effect of 250W heating power under the 220V voltage.

Description

TECHNICAL FIELD

[0001] The present application relates to a high-efficiency defrosting heater for defrosting of a wind-cooled refrigerator, and belongs to the technical field of household appliances. BACKGROUND

[0002] At present, the evaporator for a wind-cooled side-by-side refrigerator on the market is in an upper and lower slender shape, and frost will be formed on the upper and lower fins of the evaporator during refrigeration. In order to automatically defrost, the defrosting heater is usually 220V voltage, and the power is about 200W. The heating pipe resistance is more than 200Ω, and the heating wire is an iron-chromium-aluminum alloy heating wire. When applied to low-voltage direct current 12V, the resistance of the defrosting heater needs to be less than 1Ω under the same defrosting heater power. The original defrosting heater heating wire resistivity cannot meet the requirements, and only a low-resistivity type of electric heating wire with high price can be selected. Or a special additional voltage boosting circuit is used to boost 12V to 220V, and then the ordinary 220V working defrosting heating pipe is used to work.

[0003] The prior art has the following defects:

[0004] 1. Low-voltage 12V is used as the working voltage, and a low-resistivity heating wire is used for manufacturing. The diameter of the heating wire must be thick, and the disadvantages are that after the heating wire is wound, the thick wire cannot meet the process requirements of the magnesium oxide powder filling gap, and when the steel pipe is bent into the required shape, the thick winding wire is prone to eccentricity, not centered, or broken. If a copper-nickel alloy heating wire with very low resistivity is selected, the cost is high, and the high-temperature resistance is poor.

[0005] 2. The voltage boosting circuit has high cost, high energy consumption and poor reliability.

[0006] Therefore, it is necessary to improve the prior art to solve the problems of the prior art. SUMMARY

[0007] The present application is to solve the problems of the prior art, and provides a high-efficiency defrosting heater for a wind-cooled refrigerator, which solves the problems of high power and ultra-low resistance of the heater under low-voltage 12V power supply.

[0008] The technical scheme adopted by the present application is: a high-efficiency defrosting heater for a wind-cooled refrigerator is embedded with a fin evaporator, including an aluminum pipe heater, a steel pipe heater and a wire, the aluminum pipe heater includes two wires connected in parallel through the wire, the steel pipe heater also includes two wires connected in parallel through the wire, and the two parallel aluminum pipe heaters and the two parallel steel pipe heaters are connected in parallel through the wire.

[0009] Further, the aluminum tube heater comprises an electric heating wire, a nichrome electric heating wire wound on the electric heating wire, and a thermoplastic molded electric heating wire insulating skin wrapped on the electric heating wire and the nichrome electric heating wire, and an aluminum tube is sleeved on the outside of the formed electric heating wire, the nichrome electric heating wire and the electric heating wire insulating skin.

[0010] Further, the aluminum tube heater is in an S shape.

[0011] Further, the steel tube heater comprises three nichrome heating wires wound together in parallel and a 304 stainless steel into which the nichrome heating wires are fitted, and magnesium oxide powder is filled between the nichrome heating wires and the 304 stainless steel to fill the gap.

[0012] Further, the diameter of the 304 stainless steel is 6.6 mm.

[0013] Further, the nichrome heating wire is selected from Cr20Ni80 with a diameter of 0.42 mm.

[0014] Further, the steel tube heater is embedded in the lower half of the fin evaporator.

[0015] Further, the tube heater is embedded in the lower half of the fin evaporator

[0016] The present application has the following beneficial effects: the three-wire parallel connection of the 0.42 mm diameter nichrome electric heating wire meets the requirements of the conventional nichrome wire + conventional 6.6 mm diameter 304 stainless steel tube to form an ultra-low resistance (less than 1 Ω) high-power heating tube, which is assembled in the lower part of the fin evaporator, and the low-power aluminum tube heater is embedded in the upper part of the fin evaporator to perform combined heating. In the case of 12V low voltage, the air-cooled refrigerator can meet the requirements of high-power heating defrosting. The 150W power heating under 12V voltage achieves the defrosting effect of 250W heating power under 220V voltage. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a schematic diagram of the aluminum tube heater of the present application.

[0018] Figure 2 It is a schematic diagram of the steel tube heater of the present application.

[0019] Figure 3 It is a schematic diagram of the defrosting heater for high-efficiency defrosting of the air-cooled refrigerator of the present application. DETAILED DESCRIPTION

[0020] The present application will be further described below with reference to the accompanying drawings.

[0021] The defrosting heater for high-efficiency defrosting of air-cooled refrigerator comprises an aluminum pipe heater 1, a steel pipe heater 2 and a wire 3, wherein the aluminum pipe heater 1 comprises an electric heating wire 10, a nichrome electric heating wire 11 wound on the electric heating wire 10 and a temperature-resistant 120 DEG C electric heating wire insulation 13 formed by hot plastic on the electric heating wire 10 and the nichrome electric heating wire 11, the formed electric heating wire 10, the nichrome electric heating wire 11 and the electric heating wire insulation 13 are inserted into an aluminum pipe 14, heat is transferred through the aluminum pipe 14, and the aluminum pipe heater is made into S shape.

[0022] The steel pipe heater 2 comprises three nichrome heating wires 20 wound together in parallel and a 304 stainless steel 21 with a diameter of 6.6 mm in which the nichrome heating wires 20 are arranged, and magnesium oxide powder 22 is filled between the nichrome heating wires 20 and the 304 stainless steel 21 to fill the gap. The nichrome heating wires 20 are made of Cr20Ni80 with a diameter of 0.42 mm. The three nichrome heating wires 20 are wound together in parallel, so that the resistance of the heating wire becomes 1 / 3 of the resistance of a single heating wire.

[0023] The defrosting heater for high-efficiency defrosting of air-cooled refrigerator comprises two aluminum pipe heaters 1 connected in parallel through the wire 3 and two steel pipe heaters 2 connected in parallel through the wire 3, and the two parallel aluminum pipe heaters 1 and the two parallel steel pipe heaters 2 are connected in parallel through the wire 3.

[0024] Through the above measures, the overall resistance of the defrosting heater can reach 1.2 ohms, and the heater power can reach about 120W under 12V power supply. The steel pipe heater 2 is arranged at the lower part of the finned evaporator and is used for heating and defrosting the lower part of the finned evaporator and the water tray.

[0025] The S-shaped aluminum pipe heater 1 is embedded on the upper half of the finned evaporator, and the heating power can be well controlled to be about 30W through the existing aluminum pipe heater 1 process. The aluminum pipe heater 1 is embedded in the finned evaporator to defrost the upper half of the finned evaporator.

[0026] The three nichrome electric heating wires with a diameter of 0.42 mm are wound in parallel, which meets the requirements of the conventional nichrome wire + conventional 304 stainless steel pipe with a diameter of 6.6 mm to make an ultra-low resistance (less than 1 ohm) high-power heating pipe, which is assembled at the lower part of the finned evaporator, and the low-power aluminum pipe heater is embedded in the upper half of the finned evaporator for combined heating. The air-cooled refrigerator can meet the requirements of high-power heating defrosting under 12V low voltage. The 150W power heating under 12V voltage can achieve the defrosting effect of 250W heating power under 220V voltage.

[0027] The above merely describes the preferred embodiments of the present application, and it should be pointed out that those skilled in the art can make several improvements without departing from the principles of the present application, and these improvements should also be considered as the protection scope of the present application.

Claims

1. A defrosting heater for a high-efficiency defrosting system in a frost-free refrigerator, integrated with a finned evaporator, characterized in that: It includes an aluminum tube heater (1), a steel tube heater (2) and a wire (3). The aluminum tube heater (1) includes two tubes connected in parallel by the wire (3), and the steel tube heater (2) also includes two tubes connected in parallel by the wire (3). The two aluminum tube heaters (1) and the two steel tube heaters (2) connected in parallel are connected in parallel by the wire (3). The aluminum tube heater (1) includes an electric heating wire (10), a nickel-chromium alloy electric heating wire (11) wound on the electric heating wire (10), and an electric heating wire insulation sheath (13) thermoplastically wrapped around the electric heating wire (10) and the nickel-chromium alloy electric heating wire (11). An aluminum tube (14) is sleeved on the outside of the above-mentioned molded electric heating wire (10), nickel-chromium alloy electric heating wire (11), and electric heating wire insulation sheath (13). The steel pipe heater (2) includes three parallel nickel-chromium alloy heating wires (20) wound together and 304 stainless steel (21) in which the nickel-chromium alloy heating wires (20) are inserted. Magnesium oxide powder (22) is filled between the nickel-chromium alloy heating wires (20) and the 304 stainless steel (21) to fill the gap. The steel tube heater (2) is assembled in the lower part of the finned evaporator, and the aluminum tube heater (1) is embedded in the upper part of the finned evaporator.

2. The defrosting heater for a high-efficiency defrosting refrigerator as described in claim 1, characterized in that: The aluminum tube heater is S-shaped.

3. The defrosting heater for a high-efficiency defrosting refrigerator as described in claim 2, characterized in that: The diameter of the 304 stainless steel (21) is 6.6 mm.

4. The defrosting heater for a high-efficiency defrosting refrigerator as described in claim 3, characterized in that: The chromium alloy heating wire (20) is Cr20Ni80 with a diameter of 0.42mm.

5. The defrosting heater for a high-efficiency defrosting refrigerator as described in claim 1, characterized in that: The steel pipe heater (2) is embedded in the lower half of the finned evaporator.

6. The defrosting heater for a high-efficiency defrosting refrigerator as described in claim 1, characterized in that: The tube heater (1) is embedded in the lower half of the finned evaporator.

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