JP2014142126A - Cooling device and article storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling device capable of efficiently supplying heat of a defrosting device to respective sections of a cooler.SOLUTION: A cooling device 1 includes: a cooler 2 that includes a plurality of cooling fins 3 and a refrigerant tube 4 penetrating the cooling fins 3; and a defrosting device 5 that includes a tube; caps 12 covering both ends of the tube; and heating elements installed in the tube, having different diameters, and wound around the tube, with a heating value per unit length set to each section of the cooler 2 in accordance with a frosting amount of each section. By so configuring, the cooling device 1 can efficiently supply heat to the cooler 2 and improve defrosting efficiency.

Description

  The present invention relates to a cooling device including a defrosting device and an article storage device including the cooling device.

  A refrigerator represented by an article storage device is equipped with a cooler equipped with a heater as a defrosting device (see, for example, Patent Document 1).

  FIG. 4 is a cross-sectional view of a main part of the refrigerator described in Patent Document 1.

  Hereinafter, a conventional cooler will be described with reference to FIG.

  In FIG. 4, the refrigerator 13 has a freezer compartment 14 at the bottom, and a freezer compartment door 15 is provided on the front surface of the freezer compartment 14. In addition, a refrigerator compartment 16 is disposed above the freezer compartment 14, and a refrigerator compartment door 17 is provided in front of the refrigerator compartment 16. Furthermore, a cooler 18, a glass tube heater 19 as a defrosting device disposed below the cooler 18, and a fan 20 located above the cooler 18 are provided at the lower rear of the refrigerator body. .

  About the refrigerator comprised as mentioned above, the operation | movement is demonstrated below.

  The cooler 18 is cooled by the refrigerant flowing through the cooler 18, and the freezer compartment 14 and the refrigerator compartment 16 are cooled by the operation of the fan 20. Here, the heat exchanged by the cooler 18 is the high temperature outside air that flows in along with the opening and closing of the freezer compartment door 15 and the refrigerator compartment door 16 and the evaporation of moisture contained in the stored food in the freezer compartment 14 or the refrigerator compartment 16. Therefore, the moisture contained in the high-humidity air forms frost and accumulates in the cooler 18 having a low temperature.

  Therefore, when the amount of accumulated frost increases, heat transfer between the surface of the cooler 18 and air that exchanges heat is hindered, and airflow resistance is reduced, resulting in a decrease in the air volume, and a decrease in the heat passage rate. Insufficient cooling occurs.

  Therefore, before the cooling becomes insufficient, the glass tube heater 19 is energized, and the cooler 18 is heated and defrosted by radiant heat.

JP 2002-5553 A

  However, in the conventional configuration, since the heat generation amount of the glass tube heater is substantially uniform in each section, the frost formation amount in each section of the cooler is different, the frost formation amount is large, and a large amount of heat generation is defrosted. If there is a section necessary for the frosting and a section where the amount of frost formation is small and defrosting can be performed with a small amount of heat generation, a large amount of heat generation is achieved even though the section where defrosting can be performed with a small amount of heat generation has been completed. However, it has been necessary to energize the glass tube heater until the section necessary for defrosting is completed, which causes a problem of loss of electric energy.

  In order to solve the above-described conventional problems, the cooling device of the present invention is a defrosting device in which a heating element is configured with a plurality of wire diameters, and depending on the amount of frost formation in each section of the cooler, the defrosting device. The calorific value per unit length of each section is set.

  Thereby, the heat of the defroster can be efficiently supplied to the cooler.

  Since the cooling device of the present invention can efficiently supply the heat of the defroster to the cooler, the defrosting efficiency can be improved.

Front view of cooling device according to Embodiment 1 of the present invention The front view of the defroster of the cooling device in Embodiment 1 of this invention Sectional drawing of the principal part of the defroster of the cooling device in Embodiment 1 of this invention Cross section of the main part of a conventional refrigerator

  The first invention is a cooler comprising a plurality of cooling fins and a refrigerant tube penetrating the cooling fin, a tube, a plug covering both ends of the tube, and a winding process comprising a plurality of wire diameters inside the tube. The cooling device is provided with a defrosting device in which the generated heat generator is installed and the amount of heat generated per unit length is set in each section according to the amount of frost formation in each section of the cooler.

  Thereby, the heat of a defroster can be efficiently supplied to a cooler.

  2nd invention WHEREIN: In the said defrost apparatus, a heat generating body electrically connects the same material from which a wire diameter differs.

  Thereby, in the electrical connection part of the heat generating body from which a wire diameter differs, an electric corrosion can be suppressed and it can be set as a cheap structure.

  According to a third aspect of the present invention, in the defrosting device, the winding interval of the heating element in the section in which the wire diameter is large and the heat generation amount per unit length is set large, the wire diameter is small and the unit length is This is set to be smaller than the winding interval of the heating element in the section where the heat generation amount is set small.

  As a result, the section in which the wire diameter is large and the heat generation amount per unit length is set larger than the heating element in the section in which the wire diameter is small and the heat generation amount per unit length is set small. More heat from the frost device can be supplied to the entire cooler.

  In a fourth aspect of the present invention, an article storage chamber formed by a heat insulating space, a refrigeration cycle in which a compressor, a condenser, a decompression device, and a cooling device are connected in a ring shape via a pipe, and a cooling airflow generated by the cooling device is An article storage device comprising a blower that is fed into an article storage chamber, wherein the cooling device is the article storage device that is the cooling device according to any one of the first to third inventions.

  Thereby, since the heat of the defrosting device can be efficiently supplied to the cooler, the defrosting efficiency is improved, and an efficient cooling operation can be performed, and as a result, power consumption is suppressed. An article storage device can be obtained.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
1 is a front view of a cooling device according to Embodiment 1 of the present invention, FIG. 2 is a front view of a defrosting device of the cooling device according to Embodiment 1 of the present invention, and FIG. 3 is an embodiment of the present invention. It is principal part sectional drawing of the defroster of the cooling device in 1. FIG.

  In FIG. 1, the cooling device 1 includes a cooler 2 and a defrosting device 5, and the defrosting device 5 is disposed below the cooler 2.

  As shown in FIG. 2, the defroster 5 is made of a glass tube 6 and a metal resistor disposed inside the glass tube 6, and heater wires 7 and 8 having different wire diameters, and a heater. A terminal 9 for electrically connecting the wire 7 and the heater wire 8, a lead wire 10 connected to the heater wire 7, a lead wire 11 connected to the heater wire 8, and openings at both ends of the glass tube 6 are covered. And a stopper 12.

  In the present embodiment, the heater wires 7 and 8 mean heating elements.

  The section B of the cooler 2 has a narrower gap (pitch) between the adjacent cooling fins 3 and the cooling fins 3 than the section A of the cooler 2, and the frost formation amount per unit length of the section B of the cooler 2. Is larger than the amount of frost formation per unit length of the section A of the cooler 2.

  Further, a heater wire 7 is disposed below the section A of the cooler 2, and a heater wire 8 is disposed below the section B of the cooler 2.

  The inventors have studied and experimented on a method for efficiently supplying the heat of the defroster to the cooler in order to reduce the loss of electric energy.

  Next, detailed specifications of the defroster 5 will be described.

  The defroster 5 has a rated voltage of 100 V, a rated heat value of 141 W, and a resistance value of 70.9Ω, and the length C of the coiled portion of the heater wire is 300 mm, which is per unit length of the coiled portion. The calorific value is about 470 W / m.

  The heater wire 7 is formed by winding an iron chrome wire having a diameter of 0.32 mm and a resistance value of 40.6Ω into a coil shape (spiral shape), and the wound length D is 230 mm.

  The heater wire 8 is formed by winding an iron chrome wire having a diameter of 0.40 mm and a resistance value of 30.3 Ω into a coil shape (spiral shape), and the length E of the winding processing is 70 mm.

  The winding interval G of the heater wires adjacent to the heater wire 8 is set smaller than the winding interval F of the heater wires adjacent to the heater wire 7.

  Next, operation | movement of the defroster 5 which defrosts the cooler 2 is demonstrated.

  The defrosting of the frosted cooler 2 occurs when the heater wire 7 and the heater wire 8 generate heat by energization from the lead wire 10 and the lead wire 11, and the radiant heat is transferred to the refrigerant pipe 4 and the cooling fin 3. Done.

Since the resistance value 40.6Ω of the heater wire 7 is about 57% of the resistance value 70.9Ω of the defroster 5, the amount of heat generated by the heater wire 7 is about 57% of the amount of heat generated 141W of the defroster. 80 W, and the heat generation amount per unit length of the wound portion is about 348 W / m.

  Since the resistance value 30.3Ω of the heater wire 8 is about 43% of the resistance value 70.9Ω of the defroster 5, the amount of heat generated by the heater wire 8 is about 43% of the amount of heat generated 141W of the defroster 5. It becomes about 61 W, and the heat generation amount per unit length of the wound portion is about 871 W / m.

  Although the amount of frost formation per unit length of the section B of the cooler 2 is set to be larger than the amount of frost formation per unit length of the section A of the cooler 2, it is arranged below the section B of the cooler 2. Since the heat generation amount of about 871 W / m per unit length of the heater wire 8 is set to be larger than the heat generation amount of about 348 w / m per unit length of the heater wire 7, the heat of the defroster 5 can be efficiently obtained. Can be supplied to the entire cooler 2.

  In the defrosting device 5, by setting the wire diameter of the heater wire 8 to be 1.2 times or more than the wire diameter of the heater wire 7, the unit length of the heater wire in the section that requires a large amount of heat generation is set. A large amount of heat generation can be set.

  In a section where a large amount of heat generation per unit length needs to be set, the heater wire temperature can be reduced by setting the wire diameter of the heater wire large, so that the upper limit of the heater wire operating temperature is not exceeded. The amount of heat generation can be easily set larger than the section where the wire diameter of the heater wire is set small.

  Therefore, by using different wire diameters for the heater wire 7 and the heater wire 8, it becomes an inexpensive configuration compared to a configuration in which a plurality of defrosting devices are installed, and heat generation per unit length of the defrosting device is easily performed in each section. Since the amount can be set, the defrosting efficiency can be improved.

  Further, as shown in FIG. 3, the heater wire 7 and the heater wire 8 are electrically connected by crimping the terminal 9 only at one place in a state where the heater wire 7 and the heater wire 8 are overlapped. Yes.

  The heater wire 7 and the heater wire 8 are made of the same material, so that a caulking portion where the heater wire 7 and the heater wire 8 are overlapped can suppress electric corrosion and can be made inexpensive.

  In the present embodiment, the heater wire 7 and the heater wire 8 are electrically connected by using a terminal 9 and performing caulking, but the heater wire 7 and the heater wire 8 are spot-welded. It is also possible to make an electrical connection.

  Further, the winding interval G of the heater wire 8 is set smaller than the winding interval F of the heater wire 7.

  Thereby, the section with much frost formation in a cooler can be efficiently defrosted by the heat_generation | fever effect of the heater wire which adjoins.

  Moreover, the cooling device of this Embodiment comprises the defrosting device which set the emitted-heat amount per unit length to each area according to the amount of frost formation of each area of a cooler. Thereby, although the defrosting of the section where the frosting amount of the cooler is small, the defrosting time is set long until the defrosting of the section where the frosting amount is large, or Even in a section where the amount of heat generated by the defroster is small, it is possible to suppress power loss such as setting the heat generation amount of the defroster high in accordance with a section where the amount of frost is large.

  In the present embodiment, the section of the cooler is divided into two parts so that the wire diameter of the heating element in the defrosting device and the heat generation amount per unit length of the heating element are divided into two. The defrosting efficiency can be improved by arbitrarily setting a plurality of optimum sections in consideration of the frosting state of the cooler, the installation position of the defroster, the heat generation amount, and the like.

  In addition, the article storage chamber formed in the heat insulating space, the refrigeration cycle in which the compressor, the condenser, the decompression device, and the cooling device 1 are connected in a ring shape via a pipe, and the cooling airflow generated by the cooling device 1 is supplied into the article storage chamber. In the article storage device including the blower to be fed, the cooling device 1 is an article storage device that is the cooling device of the present embodiment.

  Thereby, since the heat of the defrosting device 5 can be efficiently supplied to the cooler 2, the defrosting efficiency is improved, and an efficient cooling operation can be performed. As a result, the power consumption is reduced. A suppressed article storage device can be obtained.

  In the present embodiment, as viewed from the front, the section B on the right side of the cooler 2 has a gap (pitch) between the adjacent cooling fins 3 and the cooling fin 3 as compared to the section A on the left side of the cooler 2. ) Is narrow, and the amount of frost formation per unit length of the section B of the cooler 2 is set to be larger than the amount of frost formation per unit length of the section A of the cooler 2.

  However, as viewed from the front, the section on the left side of the cooler 2 has a narrower gap (pitch) between the adjacent cooling fins 3 and the cooling fins 3 than the section on the right side of the cooler 2. The amount of frost formation per unit length of the section on the left side may be set to be larger than the amount of frost formation per unit length of the section on the right side of the cooler 2.

  In the present embodiment, there are two types of gaps between the cooling fins 3 and the cooling fins 3, but the gaps between the cooling fins 3 and the cooling fins 3 are in order from the left when viewed from the front of the cooler 2. , Small, medium and large.

  Further, the gap between the cooling fin 3 and the cooling fin 3 is large at the central portion when viewed from the front of the cooler 2, and small between the central portions on both sides, and the clearance between the cooling fin 3 and the cooling fin 3. May be two types.

  In this embodiment, the tube is the glass tube 6, but an aluminum tube may be used, for example.

  As described above, since the cooling device according to the present invention can efficiently supply the heat of the defrosting device to the cooler, it is possible to provide a cooling device with excellent defrosting characteristics, such as a refrigerator for home use and a commercial use. The refrigerator can be widely applied as a cooling device for an article storage device such as an industrial vending machine.

DESCRIPTION OF SYMBOLS 1 Cooling device 2 Cooler 3 Cooling fin 4 Refrigerant tube 5 Defrosting device 6 Glass tube 7 Heater wire 8 Heater wire 9 Terminal 10 Lead wire 11 Lead wire 12 Plug 13 Refrigerator 14 Freezer compartment 15 Freezer compartment door 16 Refrigerator compartment 17 Refrigerator Room door 18 Cooler 19 Glass tube heater 20 Fan

Claims (4)

A cooler comprising a plurality of cooling fins and a refrigerant pipe penetrating the cooling fin, a pipe, a plug covering both ends of the pipe, and a wound heating element having a plurality of wire diameters are installed inside the pipe. The cooling device provided with the defrosting device which set the calorific value per unit length in each section according to the amount of frost formation in each section of the cooler. The cooling device according to claim 1, wherein in the defrosting device, the heating elements are electrically connected with the same material having different wire diameters. The cooling device according to claim 1 or 2, wherein the winding interval of the heating element having a large wire diameter is set smaller than the winding interval of the heating element having a small wire diameter. An article storage chamber formed in an adiabatic space, a refrigeration cycle in which a compressor, a condenser, a decompression device, and a cooling device are connected in an annular manner via a pipe, and a blower that sends a cooling airflow generated by the cooling device into the article storage chamber An article storage apparatus comprising the cooling apparatus according to any one of claims 1 to 3, wherein the cooling apparatus is a cooling apparatus according to any one of claims 1 to 3.

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