WO2006121103A1

WO2006121103A1 - Cooler with defroster and refrigerator having cooler with defroster

Info

Publication number: WO2006121103A1
Application number: PCT/JP2006/309458
Authority: WO
Inventors: Kazuhiko Ito; Toshiki Maeda; Masaki Sunada
Original assignee: Matsushita Electric Industrial Co., Ltd.
Priority date: 2005-05-12
Filing date: 2006-05-11
Publication date: 2006-11-16
Also published as: JP2006343089A

Abstract

A cooler with a defroster having increased defrosting efficiency and a refrigerator having the cooler with the defroster. Cutouts are formed in cooling fins, bent parts are formed only at the vertical peripheral edges of the cutouts, and a glass tube heater is inserted into the cutouts. The bent parts are brought into contact with the glass tube of the glass tube heater to defrost the cooler by radiating the heat of the glass tube heater from the upper surface of the glass tube to the cooling fins and conducting it from the side surfaces of the glass tube to the cooling fins.

Description

Specification

Refrigerator with cooler with defroster and cooler with defroster

Technical field

The present invention relates to a cooler such as a refrigerator having a defrosting device and a refrigerator provided with the cooler.

Background art

[0002] A conventional refrigerator cooler will be described. FIG. 10 is a cross-sectional view of an essential part of a conventional refrigerator. In FIG. 10, the refrigerator has a freezer compartment 1 at the lowermost part, a freezer compartment door 2 at the front of the freezer compartment 1, a refrigerator compartment 3A above the freezer compartment 1, a refrigerator compartment door 4 at the front of the refrigerator compartment 3A, and a refrigerator main body A cooler 5 is provided at the rear of the part, a glass tube heater 6 as a defrosting device disposed in a notch opened downward at the lower part of the cooler 5, and a fan 7 at the upper part of the cooler 5. The operation of the refrigerator configured as described above will be described below.

The cooler 5 is cooled by the refrigerant flowing in the cooler 5, and the freezer compartment 1 and the refrigerator compartment 3A are cooled by the operation of the fan 7. Here, the air heat-exchanged by the cooler 5 flows into the high-temperature outside air when the freezer door 2 and the refrigerator door 4 are opened, and evaporation of water contained in stored food in the freezer 1 and the refrigerator 3 Since the air is highly humidified, the moisture in the air forms frost and deposits on the cooler 5 which is low in temperature due to the air.

As the accumulation amount of frost increases, the heat transfer between the surface of the cooler 5 and the air that exchanges heat with the surface is impeded, and the air flow is reduced due to the air flow resistance, so the heat passing rate decreases and the cooling is insufficient. Occurs. Therefore, before the cooling becomes insufficient, the glass tube heater 6 is energized to radiate and defrost the cooler 5 by radiant heat. By arranging the glass tube heater 6 in the notch which opens downward to the lower part of the cooler 5, the distance between the glass tube heater 6 and the cooler 5 is reduced, and the defrosting efficiency is improved. A cooler having such a configuration is disclosed in Japanese Patent Application Laid-Open No. 2002-5553.

In the conventional configuration described above, the distance between the glass tube heater 6 and the cooler 5 is reduced to improve the defrosting efficiency. However, the radiation heat of the glass tube heater 6 causes the defrosting. The problem is that there is a limit to further improving the defrosting efficiency. Ru.

[0006] As one of the methods of further improving the defrosting efficiency, a method of efficiently transferring the heat of the glass tube heater to the cooler will be described. FIG. 11 is a perspective view of an essential part of another conventional cooler with a defroster, and FIG. 12 is a perspective view of the defroster.

In FIG. 11 and FIG. 12, the cooler 8 A is composed of a plurality of cooling fins 10 and a refrigerant pipe 9 penetrating the cooling fins 10. A glass tube heater 11 as a defrosting device, a glass tube 12 and a plate 13 are provided. Specifically, after attaching the plate 13 having a shape along the outer peripheral upper surface of the glass tube 12 to the glass tube 12, the outer peripheral upper surface of the plate 13 is brought into contact with the lower end portion of the cooling fin 10. Form a cooler. The plate 13 is made of aluminum which is a material having a high thermal conductivity.

In this case, heat is transmitted to the cooling fins 10 through the plate 13 where the plate 13 and the glass tube 12 are in contact with each other. However, it is difficult to arrange the plate 13 and the glass tube 12 in the longitudinal direction of the glass tube 12 without forming a gap between the plate 13 and the glass tube 12, and partially the plate 13 and the glass tube An air layer is formed between them. As a result, heat is accumulated in the air layer, and a phenomenon that heat is reflected from the plate 13 to the glass tube 12 also occurs, so that heat can not be efficiently transmitted to the cooling fins 10, and the defrosting efficiency is improved. There is a problem that you can not

Furthermore, in the case where a flammable refrigerant is used in the refrigeration cycle, the above configuration can also be considered as means for suppressing the surface temperature of the glass tube 12 to the ignition temperature or less of the flammable refrigerant. However, as described above, there is a portion where an air layer is generated between the plate 13 and the glass tube 12, and the heat of the surface of the glass tube 12 is radiated to the plate 13 through the air layer and then reflected to the glass tube 12 . In this manner, it is difficult to significantly reduce the surface temperature of the glass tube 12, and the surface temperature of the glass tube 13 can not be kept below the ignition temperature of the flammable refrigerant. .

Disclosure of the invention

A cooler comprising a plurality of cooling fins and a refrigerant pipe penetrating the cooling fins, and a defroster for defrosting the cooler, the defroster comprising a glass tube and a heater installed inside the glass tube A glass tube heater consisting of a wire and a notch whose periphery is formed by a bent portion formed by bending the cooling fin and an open portion formed in a part of the cooling fin, and the glass tube heater is formed in the notch To provide a cooler with the bend and the glass tube in contact Do. In this way, in the open part, since there is no site that impedes the effect of radiant heat, the radiant heat of the glass tube heater effectively supplies heat to the cooler. Furthermore, since the glass tube is in contact with the bent portion provided in the cooling fin, the heat of the surface of the glass tube given the heater linear force is directly supplied to the bent portion of the cooling fin by thermal conduction. Can effectively supply heat to the cooler. In addition, the heat of the surface of the glass tube transfers heat to the cooling fins, which can lower the surface temperature of the glass tube of the glass tube heater.

Further, the heat of the surface of the glass tube conducts heat to the cooling fins, so the surface temperature of the glass tube of the glass tube heater can be reduced.

Further, according to the present invention, since the bent portion is provided only at the peripheral edge in the vertical direction of the notch, there are no portions in the direction of the upper surface and the lower surface of the glass tube that impede the effect of the radiant heat. The glass tube can be defrosted utilizing radiant heat to the entire surface of the glass tube in the upper surface direction, and can be effectively defrosted below the cooler in the lower surface direction of the glass tube. The radiant heat of the heater effectively supplies heat to the cooler. Furthermore, since the glass tube is in contact with the bent portion provided only at the vertical edge of the notch of the cooling fin, the heat of the surface of the glass tube given from the heater line is directly transmitted by heat conduction. The heat is supplied to the bent portion of the cooling fin to effectively supply the heat to the cooler, and the defrosting efficiency can be improved.

According to the present invention, the bending portion and the glass tube are provided at the horizontal periphery of the notch of the cooling fin by providing the bending portion at the vertical peripheral edge and the horizontal peripheral edge of the notch. The top is in contact with. Thus, the heat of the surface of the glass tube given from the heater wire can supply the heat to the cooler more by heat conduction, and the open part can supply the radiant heat of the glass tube heater to the cooler. Therefore, the defrosting efficiency can be improved more effectively.

In addition, since the bent portion provided on the horizontal peripheral edge of the notch is in contact with the upper portion of the glass tube, the heat of the surface of the upper portion of the glass tube is thermally conducted to the cooling fin. Tube heater The surface temperature of the upper part of one glass tube can be further lowered. According to the present invention, the heat conduction can be promoted by increasing the contact area between the bent portion and the upper portion of the glass tube by setting the number of horizontal bent portions of the notch to at least two or more. Since the heat can be supplied to the cooler more effectively, the defrosting efficiency can be further improved.

Further, the heat of the surface of the upper portion of the glass tube conducts heat to the cooling fins, so that the surface temperature of the upper portion of the glass tube of the glass tube heater can be further lowered.

According to the present invention, the bending portion in the horizontal direction of the notch has a bending angle of 90 degrees or less, so that when the glass tube heater is inserted into the notch, the glass tube is cut even if bending occurs or the like. A bent portion provided at the horizontal peripheral edge of the notch can maintain contact with the glass tube reliably and uniformly. In this way, the heat can be uniformly conducted to the cooler, and the defrosting efficiency can be improved. In addition, since the glass tube can be easily inserted and brought into contact with the cooling fins, productivity can be improved.

According to the present invention, since the bent portion of the cooling fin is flat, the bent portion of the cooling fin can reliably contact the glass tube, so that the defrosting efficiency can be further improved. it can. In addition, since the bending portion of the cooling fin is flat, bending force of the cooling fin is easy, and in the assemblability of inserting the glass tube heater into the cooler, the glass tube of the bending portion is installed. Since the surface is flat, the glass tube can be easily inserted, thereby improving productivity.

In the present invention, the horizontal opening of the notch is provided approximately at the center in the depth direction of the notch, so that the opening is located on the top surface of the glass tube. In this way, heat can be transferred to the cooler without interfering with the radiant heat effect of the glass tube heater, heat stagnation can be prevented, natural convection can be promoted, and defrosting efficiency can be improved. be able to.

According to the present invention, by providing the notch at the lower end portion of the cooling fin, radiant heat from the glass tube heater can be supplied to the entire cooler using natural convection upward, and the lower side of the cooler The distance between the drain pan portion and the glass tube heater is shortened, and the drain pan portion can be defrosted by radiant heat to the lower side of the glass tube heater. As a result, it is not necessary to install another defroster such as a surface heater for defrosting the drain pan portion. Also, the assemblability of installing the glass tube heater in the cooler Since the glass tube heater can be inserted, it is easier than installing the glass tube heater in the center of the cooler.

In the present invention, the contact area effective for heat conduction can be increased by providing the bent portion of the cooling fin at two or more places per one cooling fin, so the defrosting efficiency can be further enhanced. It can be improved.

[0023] The present invention can transfer the heat of the glass tube heater to the entire cooler by efficiently providing the notches in the approximate center of the depth direction of the cooler.

According to the present invention, heat conduction to the glass tube heater force cooling fin is effectively performed by setting the length of the bent portion of the cooling fin to 5% or more of the length between the adjacent cooling fins. be able to.

Further, according to the present invention, the glass tube heater fits within the notch because the vertical length of the notch is larger than the outer diameter of the glass tube. In this way, the glass tube heater can be miniaturized as a cooler with a defroster that can not protrude from the cooler.

Further, according to the present invention, since the heat flowing on the surface of the glass tube is conducted to the cooling fins by making the refrigerant flowing in the refrigerant tube a flammable refrigerant, the heat capacity of the glass tube heater is not reduced. The surface temperature of the tube can be kept below the ignition temperature of the flammable refrigerant. Brief description of the drawings

FIG. 1 is a perspective view of a cooler with a defroster according to a first embodiment of the present invention.

[FIG. 2] FIG. 2 is a perspective view of the undersurface force of the cooler with a defroster shown in FIG.

[FIG. 3] FIG. 3 is a cross-sectional view of the cooler with a defroster shown in FIG. 1, taken along line 3-3.

[FIG. 4] FIG. 4 is a cross-sectional view of an essential part of the defrosting apparatus shown in FIG.

[FIG. 5] FIG. 5 is a detailed view of the main parts of the cooling fins in the cooler with a defroster shown in FIG.

[FIG. 6] FIG. 6 is a perspective view of another cooler with a defroster according to Embodiment 1 of the present invention.

[FIG. 7] FIG. 7 is a perspective view of a cooler with a defroster according to a second embodiment of the present invention.

[FIG. 8] FIG. 8 is a cross-sectional view taken along line 8-8 of the cooler equipped with a defroster shown in FIG.

[FIG. 9] FIG. 9 is a detailed view of the main parts of the cooling fins in the cooler with a defroster shown in FIG. [FIG. 10] FIG. 10 is a sectional view of an essential part of a conventional refrigerator.

[FIG. 11] FIG. 11 is a perspective view of the main part of another conventional cooler with a defroster.

[FIG. 12] FIG. 12 is a perspective view of the defrosting apparatus shown in FIG.

Explanation of sign

21 cooler

22 refrigerant pipe

23 cooling fins

24 glass tube heater

25 notches

26 heater wire

27 glass tube

30 bends

31 Opening

BEST MODE FOR CARRYING OUT THE INVENTION

The present invention will be further described in detail below with reference to the drawings. Note that the drawings are schematic diagrams, and the positional relationships are not dimensionally accurate. Further, the present invention is not limited to this embodiment.

Embodiment 1

The first embodiment will be described with reference to FIGS. 1 to 6.

In FIG. 1, the cooler with a defroster (hereinafter referred to as “cooler”) is in contact with the cooling fins 23 and the cooling fins 23 formed of a plurality of cooling fins 23 and a refrigerant pipe 22 penetrating the cooling fins 23. A glass tube heater 24 is configured as a defrosting device.

The refrigerant pipe 22 is filled with isobutane which is a flammable refrigerant.

The glass tube heater 24 is connected to a heater wire 26 formed of a metal resistor in a coil shape, a glass tube 27 covering the heater wire 26, a cap 28 covering the opening of the glass tube 27, and the heater wire 26. The lead wire 29 is composed of

At the approximate center of the lower part of the cooling fin 23 of the cooler 21, a notch 25 opened downward is provided. The bent portion 30 is provided only at the vertical peripheral edge of the notch 25. Further, in the peripheral portion of the notch 25, an open portion 31 is present at a portion where the bending portion 30 is not formed. The bent portion 30 is not continuously formed on all the peripheral portions of the notch 25. The open part 31 has a meaning of the extent that the bent part 30 is not formed. For example, the end face of the cooling fin 23 may include a so-called collar or the like, which is often caulked at the site where the refrigerant pipe is inserted.

Then, the glass tube heater 24 is inserted into the notch 25 and the bent portion 30 and the glass tube 27 are in contact with each other. Here, although the expression of the vertical direction is used, the main point is that the bending portion 30 extends in a plane shape along the upper and lower direction of the cooler 21. More specifically, when the cooler 21 is arranged as shown in FIG. 1, the glass tube heater 24 is inserted horizontally into the notch 25 at the bottom of the cooling fin 23, and only the vertical edge of the notch 25 is inserted. The bent portion 30 provided in the and the glass tube 27 of the glass tube heater 24 are brought into contact with each other.

Glass tube 27 has a cylindrical shape with an outer diameter of 10.5 mm and an inner diameter of 8.5 mm. In addition, the length A of the bent portion 30 of the cooling fin 23 is 4.9 mm, the height B of the bent portion 30 is 12 mm, the glass tube insertion portion size of the notch 25 is C 10.8 mm, the bent portion The bending angle D of 30 is 85 °. The length of the cooling fin 23 and the adjacent cooling fin 23, that is, the so-called fin pitch is 10 mm.

The bending portion 30 is provided with two bending portions for one cooling fin, and the bending portion 30 is provided on both sides of the outer periphery of the glass tube 27 in the installation direction of the glass tube 27. And the cooling fins 23 are in contact. The material of the refrigerant pipe 22 and the cooling fin 23 is aluminum having a high thermal conductivity.

[0038] Such a cooler is formed, for example, by the following method.

First, a substantially T-shaped cut is provided on the cooling fin 23 by press processing. It is preferable to perform this pressing simultaneously with the processing for forming the outer peripheral shape of the cooling fin and the processing for forming a long hole for inserting the refrigerant pipe, since the number of steps can be reduced.

The processing method for providing the substantially T-shaped cut may be a method such as laser processing. Next, the bending portion 30 is formed by press working using a mold for defining the bending position and bending angle of the bending portion 30. In addition, this bending method may be a processing method using a bending jig!

Next, a cooling pipe 2 is formed by bending one refrigerant pipe, and the cooling pipe 2

Insert it into the long hole for refrigerant tube penetration of No. 3 and make it adhere closely.

Next, the glass tube heater 24 is inserted into the notch 25 of the cooling fin 23 and the glass tube 27 and the bent portion 30 are brought into close contact with each other to form a cooler.

The process of inserting the glass tube heater 24 into the notch 25 of the cooling fin 23 is a refrigerant tube

It may be performed before the process of inserting 22 into the long hole for the refrigerant pipe insertion of the cooling fin 23

In the above, the refrigerant pipe used is a so-called serpentine-like refrigerant pipe in which one refrigerant pipe is bent, but a so-called hairpin pipe constituted by a straight pipe portion and a bent pipe portion, and a bent pipe The refrigerant pipe may be formed by connecting the component to the return bend by brazing or the like. In that case, after the hairpin tube is inserted into the cooling fin, a return bend is attached to the end of the straight tube portion of the hairpin tube, and a refrigerant tube is formed by brazing or the like.

The operation of the cooler configured as described above will be described below.

When the frosted cooler 21 is defrosted, the heater wire 26 is heated by energization from the lead wire 29 and heat is radiated to the glass tube 27. Heat radiates further from the glass tube 27 and defrosts the cooler 21. Further, the heat of the surface of the glass tube 27 given from the heater wire 26 is supplied to the bent portion 30 by heat conduction since the bent portion 30 of the cooling fin 23 and the glass tube 27 are in contact with each other. , Defrost the cooling fins 23.

Furthermore, the glass tube heater 24 is inserted horizontally into the notch 25 in the lower part of the cooling fin 23 and is provided only at the vertical peripheral edge of the notch 25 and the glass tube heater 24 The glass tube 27 is in contact, and in the direction of the upper surface and the lower surface of the glass tube 27, there is no part that hinders the effect of radiant heat. As a result, in the upper surface direction of the glass tube 27, the radiation heat can be defrosted to the entire cooler 21, and in the lower surface direction of the glass tube 27, the drain pan below the cooler 21 (see FIG. It is effective for defrosting the part (not shown) and can improve the defrosting efficiency.

[0049] The glass tube 27 has an outer diameter of 10.5 mm and the notch 25 of the glass tube insertion portion size C is 10.8 mm. Set the dimension C of the glass tube insertion part 25 of the notch 25 wider than the outer diameter of the glass tube 27 The glass tube 27 can be easily inserted into the notch 25.

The length A of the bent portion 30 of the cooling fin 23 is 4.9 mm. Since the bent portion 30 is flat, the contact surface of the glass tube 27 is circular. On the other hand, after the glass tube 27 is inserted into the notch 25 by the setting of the glass tube insertion portion size C and the bending angle D, the bent portion 30 and the glass tube 27 can be reliably in contact with each other. Since 30 is flat, processing of the bent portion 30 is easy.

The height B of the bent portion 30 is 12 mm, and by setting the outside diameter of the glass tube 27 to be larger than 10.5 mm, the glass tube 27 can be installed without protruding below the cooler 21. The effect of being able to be miniaturized as a cooler with a defroster is obtained.

Further, as shown in FIG. 5, the bending angle D is bent at 85 °. Since the dimension C of the glass tube insertion part is set larger than the outer diameter of the glass tube 27, the glass tube 27 is installed by inclining the bent portion 30 in the installation direction of the glass tube 27. 27 and the bent portion 30 of the cooling fin 23 can be reliably in contact. However, the size C of the glass tube insertion portion may be set smaller than the outer diameter of the glass tube 27, the bending angle D of the bent portion 30 may be 90 °, and the glass tube 27 may be pressed.

Further, two bent portions 30 are provided for one cooling fin 23, and both sides of the outer periphery of the glass tube 27 are brought into contact with the cooling fins 23 in the installation direction of the glass tube 27. As a result, the contact area effective for heat conduction can be increased, and defrosting can be performed more efficiently.

The notch 25 is provided approximately at the center of the depth direction of the cooler 21, and the glass tube heater 24 is inserted in the notch 25, so that the heat of the glass tube heater 24 can be efficiently cooled in the entire cooler 21. Tell. In this manner, the possibility of the occurrence of a portion which is difficult to defrost in a part of the cooler 21 is reduced.

The effect of heat conduction from the glass tube 27 to the cooling fins 23 is improved by setting the length of the bent portion 30 of the cooling fins 23 to 5% or more of the length between the adjacent cooling fins 23. The defrosting efficiency of the chiller 2 1 is improved. Furthermore, the defrosting efficiency can be further improved by setting the length of the bent portion 30 of the cooling fin 23 to 20% or more of the length between the adjacent cooling fins 23. The maximum possible ratio of the length A of the bent portion 30 to the length between adjacent cooling fins 23 is (1Z2 of the glass tube insertion portion size C) ((length between adjacent cooling fins 23) ) In the case of the relationship which becomes, it is 100%. On the other hand, in the case of (1Z2 of the glass tube insertion portion size C) <(length between adjacent cooling fins 23), the maximum value is less than 100%.

On the other hand, the ignition temperature of isobutane, which is a flammable refrigerant, is 494 ° C. The surface temperature of glass tube 27 is set to 394 ° C. or less, which is 100 ° C. lower than the ignition temperature, to ensure safety. There is

In contrast to the cooler 21 in which the cooling fins 23 are arranged at an interval of 10 mm in fin pitch, in the present embodiment, the length of the bent portion 30 is 49% of the length between the adjacent cooling fins 23 The surface temperature of the glass tube 27 is 330 ° C., and when the flammable refrigerant is used as the refrigerant of the refrigeration cycle, there is a sufficient reduction effect of the surface temperature of the glass tube. Therefore, it is possible to provide a refrigerator that prevents the ignition of the flammable refrigerant even when the flammable refrigerant is defrosted in an environment where the flammable refrigerant leaks to the installation atmosphere of the defrosting means.

Also, the defrosting efficiency is improved and the defrosting time can be shortened, so that the power consumption of the refrigerator can be reduced.

In the present embodiment, the bending portion 30 may be provided with the cooling fin 23 not provided with the bending portion 30 according to the force required for all the cooling fins 23. For example, the cooling fins 23 provided with the bent portions 30 and the cooling fins 23 not provided with the bent portions 30 may be alternately arranged, or the cooling fins 23 provided with the bent portions 30 may be alternately provided. It may be arranged.

In the present embodiment, the glass tube heater 24 is inserted in the lower part of the cooler 21. However, as shown in FIG. 6, the glass tube heater is further disposed at a position between the coolers in the height direction. 24 can be inserted, and two glass tube heaters can be inserted into one cooler. Furthermore, three or more glass tube heaters may be inserted.

In the present embodiment, the bending portion 30 may be provided at two places with respect to the cooling fin 23, depending on necessity, the bending part 30 may be provided at one place.

In the present embodiment, the refrigerant pipe 22 and the cooling fins 23 may have high thermal conductivity, and the material of the force refrigerant pipe 22 and the cooling fins 23 may be copper.

Embodiment 2

The second embodiment will be described with reference to FIGS. 7 to 9. In FIG. 7, the cooler includes a cooler 21 including a plurality of cooling fins 23 and a refrigerant pipe 22 penetrating the cooling fins 23, and a cooling fin 2. 3 and a glass tube heater 24 as a defrosting device in contact. The refrigerant pipe 22 is filled with isobutane which is a flammable refrigerant.

The glass tube heater 24 is connected to a heater wire 26 formed by coiling a metal resistor, a glass tube 27 covering the heater wire 26, a cap 28 covering the opening of the glass tube 27, and the heater wire 26. The lead wire 29 is composed of

At the approximate center of the lower part of the cooling fin 23 of the cooler 21, a notch 25 opening downward is provided, and a bent portion 30 is formed on the vertical edge and the horizontal edge of the notch 25. Is provided.

Further, in the peripheral edge portion of the notch 25, an open portion 31 which is open is present at a portion where the bending portion 30 is not formed. In addition, the bending part 30 is not continuously formed in all the peripheral parts of the notch 25.

The open part 31 means a part where the bent part 30 is not formed. For example, the end face of the cooling fin 23 is a so-called force which is often caulked at the part where the refrigerant pipe is inserted. It also includes lathe parts.

Then, the glass tube heater 24 is inserted into the notch 25 and the bent portion 30 and the glass tube 27 are in contact with each other. Here, although the expressions of the vertical direction and the horizontal direction are used, the main point is that the vertical direction means that the bent portion 30 extends in a plane along the vertical direction of the cooler 21. Further, the horizontal direction means that the bent portion 30 is present along the left-right direction of the cooler 21 or in the vicinity of the top of the notch 25 in a substantially U-shaped form.

More specifically, when the cooler 21 is arranged as shown in FIG. 7, the glass tube heater 24 is horizontally inserted into the notch 25 at the bottom of the cooling fin 23 and provided in the vertical direction of the notch 25. Two bent portions 30 and two bent portions provided in the horizontal direction (ie, two bent portions 30 provided in the shape of a letter of “ヽ” from the vicinity of the top of the notch 25) Contact the glass tube 27 of the heater 24.

Note that the length A of the bending portion 30 in the vertical direction of the cooling fin 23 and the length F of the bending portion 30 in the horizontal direction are 4.9 mm, the height B of the bending portion 30 is 12 mm, and the notch The 25 glass tube insertion part size C is 10. 8 mm, and the bending angle D of the bending part 30 is 85 °. The so-called fin pitch between the cooling fins 23 and the adjacent cooling fins 23 is 10 mm. In addition, the bending portion 30 is provided with four bending portions for one cooling fin, and in the installation direction of the glass tube 27, the bending portions are provided on both sides and the upper portion of the outer periphery of the glass tube 27. 30 and the cooling fins 23 are in contact with each other.

The bending angle E of the horizontal bent portion 30 of the cooling fin 23 is 90 ° or less. The refrigerant pipe 22 and the cooling fins 23 are formed of aluminum, which is a material having a high thermal conductivity.

Such a cooler is formed, for example, by the following method. First, a substantially cross-shaped cut is provided on the cooling fin 23 by a press cover. This press caulk is desirable because it can reduce the number of processes if it is performed simultaneously with the process of forming the outer peripheral shape of the cooling fin and the process of forming a long hole for inserting the refrigerant pipe.

As a processing method for providing the substantially cross-shaped cut, a method such as laser processing may be used.

Next, the bending portion 30 is formed by pressing using a bending position of the bending portion 30 and a die for defining a bending angle.

Note that this bending method may use a processing method using a bending jig!

Next, the refrigerant pipe 22 formed by bending one refrigerant pipe is used as a cooling fin 2

Insert it into the long hole for refrigerant tube penetration of No. 3 and make it adhere closely. Next, the glass tube heater 24 is inserted into the notch 25 of the cooling fin 23 and the glass tube 27 is brought into close contact with the bent portion 30 to form a cooler.

The step of inserting the glass tube heater 24 into the notch 25 of the cooling fin 23 may be performed before the step of inserting the cooling medium tube 22 into the long hole for the refrigerant tube insertion of the cooling fin 23. I do not care.

[0079] In the above, the refrigerant pipe used is a so-called serpentine-like refrigerant pipe in which one refrigerant pipe is bent, but a so-called hairpin pipe composed of a straight pipe part and a bent pipe part The refrigerant pipe may be formed by connecting the component to the return bend by brazing or the like. In that case, after the hairpin tube is inserted into the cooling fin, a return bend is attached to the end of the straight tube portion of the hairpin tube, and a refrigerant tube is formed by brazing or the like.

The operation of the cooler configured as described above will be described below. When the frosted cooler 21 is defrosted, the heater wire 26 is heated by energization from the lead wire 29, and heat is radiated to the glass tube 27. Heat radiates further from the glass tube 27 and defrosts the cooler 21. Further, the heat of the surface of the glass tube 27 given from the heater wire 26 is supplied to the bent portion 30 by heat conduction since the bent portion 30 of the cooling fin 23 and the glass tube 27 are in contact with each other. , Defrost the cooling fins 23.

Furthermore, due to the open part 31, radiation heat can be utilized in the upper surface direction of the glass tube 27 to defrost the entire cooler 21, and in the lower surface direction of the glass tube 27, the cooler 21 is It is effective for defrosting the drain pan (not shown) part below. Thus, the defrosting efficiency can be improved.

Further, by providing the bent portions 30 on the vertical peripheral edge and the horizontal peripheral edge of the notches 25, the bent portions 30 provided on the horizontal edge of the notches 25 of the cooling fin 23 and the like The upper part of the glass tube 27 is in contact. As a result, the heat of the surface of the glass tube 27 given from the heater wire 26 can supply more heat to the cooler 21 by heat conduction, and the radiation from the glass tube heater 24 can be cooled from the open part 31. Defrosting efficiency can be improved more effectively because it can be supplied to

Further, since the bent portion 30 provided on the horizontal periphery of the notch 25 is in contact with the upper portion of the glass tube 27, the heat of the surface of the upper portion of the glass tube 27 is transferred to the cooling fin 23. The surface temperature of the upper portion of the glass tube 27 of the glass tube heater 24 can be further lowered because the heat is conducted.

The horizontal opening 31 is provided approximately at the center of the notch in the depth direction, that is, disposed on the uppermost surface of the glass tube 27 to maximize the radiation heat effect. It can be done.

The length A of the vertical bending portion 30 of the cooling fin 23 and the length F of the horizontal bending portion 30 are 4.9 mm. Since the bending portion 30 is flat, the contact surface with the glass tube 27 is circular, but the glass tube 27 is inserted into the notch 25 by setting the dimension C of the glass tube and the bending angles D and E. After that, since the bent portion 30 and the glass tube 27 can be reliably brought into contact with each other, and since the bent portion 30 is flat, processing of the bent portion 30 is easy.

The height B of the bent portion 30 in the vertical direction is 12 mm, and by setting the outer diameter of the glass tube 27 to be larger than 10.5 mm, the glass tube 27 does not protrude to the lower part of the cooler 21. Can be installed Therefore, the effect of being able to be miniaturized as a cooler with a defrosting device is obtained.

Further, as shown in FIG. 5, the bending angle D of the bending portion 30 in the vertical direction is bent at 85 °. Since the dimension C of the glass tube insertion portion is set larger than the outer diameter of the glass tube 27, the glass tube 27 is installed by inclining the bent portion 30 in the installation direction of the glass tube 27. 27 and the bent portion 30 of the cooling fin 23 can be reliably in contact with each other. However, the dimension C of the glass tube insertion portion may be set smaller than the outer diameter of the glass tube 27, the bending angle D of the bent portion 30 may be 90 °, and the glass tube 27 may be pressed.

Further, as shown in FIG. 9, the bending angle E of the bent portion 30 in the horizontal direction is bent to 90 ° or less. By thus inclining the bending portion 30 in the installation direction of the glass tube 27, even when the glass tube 27 bends, the insertion angle varies, or the forming variation of the cooling fins 23 occurs when the glass tube 27 is inserted. The bent portions 30 of the glass tube 27 and the cooling fins 23 can be reliably in contact with each other.

The bending angle E is preferably in the range of 85 ° to 70 ° in consideration of the processability of the cooling fin 23 and the insertability of the glass tube 27.

In addition, four bent portions 30 are provided for one cooling fin 23, and cooling is performed at two places on the outer periphery of the glass tube 27 and at two places on the upper surface in the installation direction of the glass tube 27. The contact with the fins 23 can increase the effective contact area for heat conduction, and defrost more efficiently.

The notch 25 is provided approximately at the center of the depth direction of the cooler 21 and the glass tube heater 24 is inserted in the notch 25, so that the heat of the glass tube heater 24 can be efficiently cooled in the entire cooler 21. As it is transmitted, the possibility of occurrence of a location where it is difficult to defrost in part of the cooler 21 is reduced.

The effect of heat conduction from the glass tube 27 to the cooling fins 23 is improved by setting the length of the bent portion 30 of the cooling fins 23 to be 5% or more of the length between the adjacent cooling fins 23. The defrosting efficiency of the chiller 2 1 is improved. Furthermore, the defrosting efficiency can be further improved by setting the length of the bent portion 30 of the cooling fin 23 to 20% or more of the length between the adjacent cooling fins 23. Note that the maximum possible ratio of the length A of the vertical bending portion 30 and the length F of the horizontal bending portion 30 to the length between the adjacent cooling fins 23 is (glass tube insertion portion Dimension It is 100% when the relation is such that 1Z2) of method C ≥ (the length between adjacent cooling fins 23). On the other hand, in the case of (1Z2 of the glass tube insertion portion size C) (length between adjacent cooling fins 23), it is less than 100%.

On the other hand, the ignition temperature of isobutane, which is a flammable refrigerant, is 494 ° C, and the surface temperature of the glass tube 27 is set to 394 ° C or less, which is 100 ° C lower than the ignition temperature, to ensure safety. There is

In contrast to the cooler 21 in which the cooling fins 23 are arranged at an interval of 10 mm in fin pitch, in the present embodiment, the length of the bent portion 30 is 49% of the length between the adjacent cooling fins 23. The surface temperature of the glass tube 27 is 330 ° C., and when the flammable refrigerant is used as the refrigerant of the refrigeration cycle, there is a sufficient reduction effect of the surface temperature of the glass tube. Therefore, even when defrosting is performed in an environment where the flammable refrigerant leaks to the installation atmosphere of the defrosting means, it is possible to provide a refrigerator that prevents the ignition of the flammable refrigerant.

The power consumption of the refrigerator can be reduced because the defrosting efficiency is improved and the defrosting time can be shortened.

In the present embodiment, the bending portions 30 in the horizontal direction are provided at the cooling fin 23 in two places, but the bending portions 30 in the horizontal direction may be provided in three or more places if necessary.

In the present embodiment, the bent portion 30 provided on the peripheral edge in the horizontal direction of the notch 25 includes two bent portions 30 in which the force in the vicinity of the top of the notch 25 is also formed substantially in a U shape. Instead of being generally in the form of a straight line, it may be a straight bend along the left-right direction.

As described above, the cooler of the present invention can improve the defrosting efficiency by the radiant heat from the glass tube heater and the heat conduction to the glass tube heater power cooling fin.

In the case where a flammable refrigerant is used, the heat of the surface of the glass tube is in contact with the glass tube. Since the heat is conducted to the cooling fins that are touched, the surface temperature of the heat pipe can be suppressed to the ignition temperature or less of the flammable refrigerant without reducing the heat capacity of the heater wire.

Industrial applicability

The defroster-equipped cooler of the present invention can efficiently cool and supply the heat of the glass tube heater, and therefore can be applied to applications such as a refrigerator and a vending machine.

Claims

The scope of the claims

[I] A cooler comprising a plurality of cooling fins and a refrigerant pipe passing through the cooling fins, and a defroster for defrosting the cooler,

The defrosting apparatus is a glass tube heater consisting of a glass tube and a heater wire installed inside the glass tube, and a part of the cooling fin is provided with a bent portion formed by bending the cooling fin and a notch. A cooler with a defroster, wherein the glass tube heater is inserted into the notch, and the bent portion and the glass tube are brought into contact with each other.

[2] The cooler with a defrosting device according to claim 1, wherein a bent portion is provided only at the peripheral edge in the vertical direction of the notch.

[3] The cooler with a defrosting device according to claim 1, wherein a bent portion is provided at a vertical peripheral edge and a horizontal peripheral edge of the notch.

[4] The cooler with a defroster according to claim 3, wherein the horizontal opening of the notch is provided at the center with respect to the depth direction of the notch.

[5] The cooler with a defrosting device according to claim 3, wherein the bent portions in the horizontal direction of the notch are formed at two or more places.

[6] The cooler with a defroster according to claim 5, wherein the bending portion in the horizontal direction of the notch has a bending angle of 90 degrees or less.

[7] The cooler with a defroster according to claim 1, wherein the bent portion of the cooling fin is flat.

[8] The present invention is characterized in that the notch is provided at the lower end portion of the cooling fin.

V, cooler with defroster according to any one of the preceding claims.

[9] The cooler with a defroster according to claim 8, wherein a length in a vertical direction of the notch is larger than an outer diameter of the glass tube.

[10] The cooler with a defrosting device according to any one of claims 1 to 3, characterized in that the bent portion of the cooling fin is provided at two or more places per one cooling fin.

[II] The cooler with a defroster according to claim 10, wherein a length of a bent portion of the cooling fin is 5% or more of a length between adjacent cooling fins.

[12] The notch is provided at the center with respect to the depth direction of the cooler. A cooler with a defrosting device according to any one of claims 1 to 3.

The refrigerant | coolant which flowed in the said refrigerant | coolant pipe | tube was made into the flammable refrigerant | coolant, The refrigerator provided with the cooler with a defrost apparatus of Claim 1 characterized by the above-mentioned.