JP2015152254A - Cooling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a cooling device of small power source loss by shortening a defrosting time and improving defrosting efficiency.SOLUTION: A cooling device includes: a cooler 2; and a defrosting device 5 composed of a heater 6 for heating the cooler 2. Heater wires 8a, 8b of the heater 6 of the defrosting device are constituted to have different heating values per a unit length. Thus heat of the defrosting device can be efficiently supplied to the cooler according to dispersion of a frost formation amounts, a defrosting efficiency can be improved, a defrosting time can be shortened, and a power loss can be reduced.

Description

  The present invention relates to a cooling device.

  In general, a refrigerator represented by an article storage device is provided with a cooler, and the cooler includes a heater as a defrosting device (see, for example, Patent Document 1).

  Hereinafter, a conventional cooler will be described with reference to FIG. FIG. 5 is a cross-sectional view of a main part of the refrigerator described in Patent Document 1.

  In FIG. 5, the refrigerator 113 has a freezer compartment 114 disposed at the bottom, and a freezer compartment door 115 is provided in front of the freezer compartment 114. In addition, a refrigerator compartment 116 is disposed above the freezer compartment 114, and a refrigerator compartment door 117 is provided in front of the refrigerator compartment 116. Furthermore, a cooler 118, a glass tube heater 119 as a defrosting device disposed below the cooler 118, and a fan 120 located above the cooler 118 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 118 is cooled by the refrigerant flowing through the cooler 118, and the freezer compartment 114 and the refrigerator compartment 116 are cooled by the operation of the fan 120.

  Here, the heat exchanged by the cooler 118 is the high temperature outside air that flows in along with the opening and closing of the freezer compartment door 115 and the freezer compartment door 116, and the evaporation of moisture contained in the stored food in the freezer compartment 114 or the freezer compartment 116. Therefore, the moisture contained in the high-humidity air forms frost and accumulates in the cooler 118 having a low temperature.

  Therefore, when the amount of accumulated frost increases, heat transfer between the surface of the cooler 118 and the 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 119 is energized, and the cooler 117 is heated and defrosted by radiant heat.

JP 2002-5553 A

However, in the configuration described in the above-mentioned conventional patent document 1, the amount of heat generated by the glass tube heater 119 is almost uniform over the entire length in the longitudinal direction. Therefore, the case where frost adhering to the cooler varies is excluded. It took time to frost. That is, some coolers 118 are designed so that the amount of frost formation varies, and the amount of frost formation is not uniform. In other words, the cooler 118 has a section that has a large amount of frost formation and requires a large amount of heat generation for defrosting, and a section that has a small amount of frost formation and can be defrosted with a small amount of heat generation. In the case of a cooler, the glass tube heater 119 is used until a section where a large amount of heat generation is necessary for defrosting is completed even though a section where defrosting can be performed with a small amount of heat generation has been completed. It is necessary to energize the battery, and it takes time to defrost.

  The present invention has been made in view of the above points, and aims to shorten the defrosting time and reduce power loss.

  In order to solve the above-described conventional problems, the present invention has a configuration in which the heat generation amount per unit length of the heater of the defroster that heats the cooler is varied.

  Thereby, the heat of the defrosting device can be efficiently supplied to the cooler according to the variation in the amount of frost formation, and the defrosting efficiency can be increased and the defrosting time can be shortened.

  Since the cooling device of the present invention can efficiently supply the heat of the defrosting device to the cooler to increase the defrosting efficiency, the defrosting time can be shortened and the power loss can be reduced to promote energy saving.

Front view of cooling device according to Embodiment 1 of the present invention Front view showing the defroster of the cooling device The principal expanded sectional view of the defrosting device Schematic diagram of an article storage device equipped with the cooling device of the first embodiment Cross-sectional view of main parts showing a conventional refrigerator

  1st invention is equipped with the cooler which consists of a several cooling fin and the refrigerant pipe which penetrates the said cooling fin, and the defrost apparatus which consists of a heater which heats the said cooler, The heater of the said defrost apparatus is, The heat generation amount per unit length is made different.

  With such a configuration, the heat of the defrosting device can be efficiently supplied to the cooler according to the variation in the amount of frost formation, and the defrosting efficiency can be improved and the defrosting time can be shortened.

  According to a second aspect, in the first aspect, the amount of heat generated per unit length of the heater of the defroster is set according to the amount of frost formed in each section of the cooler.

  With this configuration, the defrosting time can be shortened more efficiently, and the energy saving performance can be improved.

  According to a third aspect of the present invention, in the first or second aspect, the heater of the defrosting device is made of iron-chromium-aluminum alloy as the material of the heater wire in the section in which the calorific value per unit length is set large. The material of the heater wire in the section in which the amount of heat generated per hit is set to be small is a nickel-chromium alloy.

  By setting it as this structure, with respect to the area with much frost formation amount of a cooler, the emitted-heat amount of a defroster can be set more largely, and it is defrosting with respect to the area with little frost formation amount. Since the heat generation amount of the device can be set smaller, the heat of the defrosting device can be efficiently supplied to the cooler, and the defrosting time can be shortened and the power loss can be reduced more effectively. .

  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)
FIG. 1 is a front view of a cooling device according to Embodiment 1 of the present invention. FIG. 2 is a front view of the defroster according to Embodiment 1 of the present invention. FIG. 3 is an enlarged cross-sectional view of a main part of the defroster according to Embodiment 1 of the present invention.

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

  The cooler 2 includes a plurality of cooling fins 3 and a refrigerant pipe 4 that penetrates the cooling fins 3. And, for example, in the section B of the cooler 2, the gap between the adjacent cooling fin 3 and the cooling fin 3 is narrower than the section A of the cooler 2, and the amount of frost formation per unit length of the section B of the cooler 2 is The setting is larger than the amount of frost formation per unit length in the section A of the cooler 2.

  On the other hand, the defrosting device 5 is composed of a heater 6 such as a glass tube heater, and comprises a glass tube 7 and heater wires 8a and 8b arranged inside the glass tube 7, as shown in FIG. Specifically, the heater 6 constituting the defrosting device 5 is made of a metal resistor, and a heater wire 8a and a heater wire 8b made of different materials, a terminal 9 for electrically connecting the heater wire 8a and the heater wire 8b, The lead wire 10 is connected to the heater wire 8 a, the lead wire 11 is connected to the heater wire 8 b, and the plug 12 covers the openings at both ends of the glass tube 7.

  In the heater 6, a heater wire 8 a is arranged below the section D of the cooler 2, and a heater wire 8 b is arranged below the section E of the cooler 2.

  The heater 6 of the defrosting device 5 has a rated voltage of 100 V, a rated heating value of 120 W, and a resistance value of 83.3Ω, and the length C of the coiled portion of the heater wire is 220 mm. The calorific value per length is about 545 W / m.

  Of the heater wires, the heater wire 8a uses a nickel chrome alloy, is wound in a coil shape (spiral shape) with a diameter of 0.35 mm and a resistance value of 27.8Ω, and the length D is wound. Is 130 mm.

  The heater wire 8b is made of iron-chromium-aluminum alloy and is wound into a coil shape (spiral shape) with a diameter of 0.35 mm and a resistance value of 55.5 Ω. is there.

  Next, a defrosting operation for defrosting the cooler 2 configured as described above will be described.

  When the frosted cooler 2 is energized from the lead wire 10 and the lead wire 11, the heater wire 8 a and the heater wire 8 b generate heat, and the radiant heat is transferred to the refrigerant pipe 4 and the cooling fin 3 to be defrosted. The

  Since the resistance value 27.8Ω of the heater wire 8a is about 33% of the resistance value 83.3Ω of the defrosting device 5, the heating value of the heater wire 8a is about 33% of the heating value 120W of the defrosting device 5. The amount of heat generated per unit length of the wound portion is about 308 W / m.

  On the other hand, since the resistance value 55.5Ω of the heater wire 8b is about 67% of the resistance value 83.3Ω of the defroster 5, the heat value of the heater wire 8b is about 67 of the heat value 120W of the defroster 5. %, And the calorific value per unit length of the wound portion is about 889 W / m.

That is, the heater 6 has different heat generation amounts per unit length in the length direction.

  Therefore, even if 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, the section B of the cooler 2 is set. Since the heat generation amount of about 889 W / m per unit length of the heater wire 8b disposed below the heater wire 8a is larger than the heat generation amount of about 308 w / m per unit length of the heater wire 8a, the defrosting device 5 Heat can be supplied to the entire cooler 2.

  The material of the heater wire 8b located below the section B where the amount of frost formation per unit length is large needs to be able to set a larger amount of heat generation per unit length of the wound processing portion. In this form, iron-chromium-aluminum alloy is used, which has the following advantages.

  First, the iron-chromium alloy has high heat resistance and is an inexpensive heating wire.

  In addition, iron-chromium-aluminum alloy has a high volume resistivity and heat treatment at a high temperature compared to nickel-chromium alloy, which is also heat-resistant and inexpensive. Therefore, the distance between the heater wires adjacent to each other when processed into a spiral shape can be set shorter. Therefore, compared with the case where a nickel chromium alloy is used, the diameter of a heater wire can be set large. Compared to nickel-chromium alloy, the heater wire's linear watt density (heat generation amount per heater wire surface area) can be suppressed, and the heater wire temperature is an important factor for ensuring the heater wire life. Can be set below the upper limit of the operating temperature and the calorific value can be set large.

  That is, in the defrosting device 5, the material of the heater wire 8b is iron chrome aluminum alloy, so that the heat generation amount per unit length of the section B where the heat generation amount needs to be set larger can be set. it can.

  On the other hand, the heater wire 8a located below the section A where the amount of frost formation per unit length is small, the heat generation amount per unit length of the winding portion is reduced to the heater wire 8b in order to suppress the loss of electric power. It is smaller and needs to be set arbitrarily according to the amount of frost formation. In this embodiment, a nickel chromium alloy is used, and the following advantages are obtained.

  First, nickel chrome alloy is a heat wire that has high heat resistance and is inexpensive.

  In addition, the iron-chromium alloy, which is also a heat resistant and inexpensive material, has a temperature range where the material becomes brittle, called 475 ° C brittleness. To ensure the reliability of the heater wire, the heater wire temperature is 400 ° C. Therefore, it is difficult to arbitrarily set the amount of heat generated per unit length of the wound portion in a section where the amount of frost formation per unit length is small. . However, the nickel chromium alloy is not brittle at 475 ° C., and the heater wire temperature can be set to 550 ° C. or lower.

  Therefore, in the defrosting device 5, the material of the heater wire 8a is nickel chrome alloy so that the heat generation amount per unit length of the section A where the heat generation amount needs to be set relatively small can be set arbitrarily small. be able to.

  In addition, as illustrated in the present embodiment, the heater wire 8a and the heater wire 8b are configured using different materials, so that the configuration is less expensive than the case where a plurality of defrosting devices are installed, and each section is easily configured. The amount of heat generated per unit length of the defrosting device can be set to the defrosting device, and the defrosting efficiency can be improved.

  Further, as shown in FIG. 3, the heater wire 8a and the heater wire 8b are electrically connected by the terminal 9 in a state where the heater wire 8a and the heater wire 8b are not in contact with each other. Can suppress electric corrosion.

  In the present embodiment, the heater wire 8a and the terminal 9 and the heater wire 8b and the terminal 9 are electrically connected by caulking, respectively, but can also be electrically connected by spot welding.

  As described above, the cooling device according to the present embodiment includes the defrosting device 5 including the heater 6 in which the heat generation amount per unit length is set in each section according to the frost formation amount in each section of the cooler 2. It has. Thereby, although the defrosting of the section where the frosting amount of the cooler 2 is small is completed, the defrosting time is set long until the defrosting of the section where the frosting amount is large is completed, or Even in a section where the amount of heat generated by the defroster 5 is small, it is possible to suppress power loss such as setting a large amount of heat generated by the defroster in accordance with a section where the amount of frost is large.

(Embodiment 2)
FIG. 4 is a schematic diagram showing an article storage device equipped with the cooling device described in the first embodiment.

  In FIG. 4, the article storage device is partitioned into a storage space 16 for goods and a machine room 17 by a partition wall 15 in a heat insulating storage device body 14 that is opened and closed by a door, and the storage space 16 is cooled. The refrigerant circuit 18 is provided.

  The refrigerant circuit 18 has a configuration in which the compressor 19, the radiator 20, the pressure reducing device 21, and the cooling device 22 described in the first embodiment are connected in a ring shape. And the cooling device 22 is arrange | positioned in the storage space 16 which comprised the air blower (not shown). The cooling heat of the cooling device 22 is agitated so as to circulate in the storage space 16 by a blower as indicated by an arrow, and the storage space 16 is cooled.

  The article storage device configured as described above can efficiently supply the heat of the defroster to the cooler according to the frost amount variation, as the cooling device 22 described in the first embodiment. Since the defrosting efficiency can be increased and the defrosting time can be shortened, an energy saving article storage device with low power consumption can be obtained.

  In the above embodiment, the section of the cooler 2 is divided into two, so that the heater wire material and the heat generation amount per unit length of the heater wire in the defrosting device 5 are set to two. Although the thing was illustrated, this should just set the some optimal area | region in consideration of the frost formation state of the cooler 2, the installation position of the defroster 5, a calorific value, etc., and, thereby, defrost efficiency Can be improved.

  As described above, the present invention can efficiently supply the heat of the defrosting device to the cooler, so that it is possible to provide a cooling device with excellent defrosting characteristics and energy saving, and it is automatically sold from household use such as a refrigerator. It can be widely used as an industrial article storage device such as a machine and its cooling device.

DESCRIPTION OF SYMBOLS 1 Cooling device 2 Cooler 3 Cooling fin 4 Refrigerant tube 5 Defrosting device 6 Heater 7 Glass tube 8a, 8b Heater wire 9 Terminal 10 Lead wire 11 Lead wire 12 Plug 14 Storage device main body 15 Partition wall 16 Storage space 17 Machine room 18 Refrigerant circuit 19 Compressor 20 Radiator 21 Pressure reducing device 22 Cooling device

Claims (3)

A cooler comprising a plurality of cooling fins and a refrigerant pipe penetrating the cooling fin, and a defrosting device comprising a heater for heating the cooler, wherein the heater of the defrosting device is per unit length. Cooling devices with different calorific values. The cooling device according to claim 1, wherein the heat generation amount per unit length of the heater of the defrosting device is set according to the frosting amount of each section of the cooler. For the heater of the defroster, the material of the heater wire in the section where the heat generation amount per unit length is set to large is made of iron-chromium aluminum alloy, and the material of the heater wire in the section where the heat generation amount per unit length is set small is nickel. The cooling device according to claim 1 or 2, wherein the cooling device is a chromium alloy.

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