JP2001027472A - Cooling device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent breakage of a fan and breakdown of a motor due to the frost adhering to the fan of a cooling unit to avoid influences exerted on the food commodities in a storage room, and to improve operating properties at the time of inspection work. SOLUTION: This cooling device is provided with a fan casing 4, a cooler which is stored in this fan casing 4, a fan 8 which ventilates this cooler, a fan guard 13 for protecting this fan 8, and a heater 10 for defrosting the fan 8 in a heat insulating box body. In this case, the heater 10 is fixed by defrosting heater-fixing members 19, 19 that are provided at the fan casing 4, and the heater 10 is positioned between the fan 8 and the fan guard 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device provided in a heat insulator.

[0002]

2. Description of the Related Art As a first conventional example, this type of cooling device is disclosed in, for example, Japanese Patent Laid-Open No. 7-71862 (F25D21).
/ 08), in a cooling device that cools by supplying cool air into a storage room constituted by heat insulating walls, a cooler in the cooling device, a fan that ventilates the cooler, and a heater for defrosting the fan. And the heater is attached to a lower portion of the fan at a distance from the discharge port.

Another second conventional example of the cooling device will be described with reference to FIGS. 4 is a sectional view of the cooling device 2 of the cooling storage 1, a perspective view of FIG. 5, and FIG.
3 is a sectional view taken along line BB of FIG. The cooling device 2 includes a cooler 7 and a motor 2 in a cooling storage 1 configured by heat insulating walls.
0, a fan 8 made of a steel plate having a plurality of blades attached to the electric motor 20, a fan casing 4 provided around the fan and the electric motor, and a defrost heater 10 for the fan 8. The operation of the motor 20 causes the suction port 1
The cool air sucked from 1 and exchanged heat with the cooler 7 is forcibly circulated from the outlet 12 into the cooling storage 1. The defrost heater 10 for melting the frost attached to the fan 8 includes:
It has a substantially W-shape, and has bent portions 10A, 10A at the center of the defrost heater 10 inserted into a metal wire fan guard 13 provided substantially in front of the fan 8.
A, 13A, and further bends the two fixing members 22 made of a thin steel plate, thereby forming both ends 10 of the heater 10 for defrosting.
B and 10B are fixed to the wire of the fan guard 13, and the defrost heater 10 is positioned substantially in front of the fan 8.

[0004]

Incidentally, since the fan of the cooling device is cooled by the cool air, the moisture in the storage chamber becomes frost and adheres, so that it is necessary to appropriately perform defrosting. For this purpose, in the first conventional example, a heater for defrosting is provided at a lower portion of the blower to melt frost attached to the fan. However, since the fan is stopped at the time of defrosting, some blades are stopped at a position far from the defrosting heater, and the heat of the defrosting heater hardly reaches such a portion, and the fan is stopped. In some cases, the cooling operation of the cooling device may be started before the frost completely melts, and the balance of the fan may be lost, resulting in damage to the fan and failure of the electric motor. In addition, since the temperature of the air in the storage chamber is low, in severe cases, the ice gradually grows into ice and grows icy, and sometimes remains attached to a fan, a fan guard, a fan casing, or the like. Therefore, conventionally, by increasing the heat generating capacity of the defrost heater, the temperature of the surface of the fan and the fan casing is raised to a temperature higher than the freezing point of water to perform defrosting, and the defrosted water is provided at the lower portion. It was received by a receiving plate and drained to the outside from a drain hose. However, in this method, the distance between the frosted fan and the defrosting heater is long, so the defrosting time is long, and the temperature of the cooling storage increases due to the heat of the defrosting heater during that time, and the quality of food etc. Had been reduced.

On the other hand, in the second conventional example, the defrost heater 10 is fixed to the fan guard 13 by the fixing member 22. It was necessary to remove the taking heater 10 and at the same time disconnect its power supply line from the electrical box (not shown). As described above, when inspecting or replacing the fan 8, it is necessary to pay close attention to fixing the power supply line around the fan 8, which is a rotating object, which is inconvenient in terms of maintenance of the cooling device 2. .

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problem, and prevents a cooling device installed in a storage room from damaging a fan or an electric motor due to frost and avoiding an effect on food in the storage room. And to improve workability during inspection and repair work.

[0007]

According to a first aspect of the present invention, there is provided a cooling device comprising a fan casing, a cooler housed in the fan casing, and a fan ventilating the cooler in the heat insulating box. A cooling device including a fan guard for protecting the fan and a heater for defrosting the fan, wherein the heater is fixed by a fixing member provided in the fan casing, and the heater is connected to the fan and the fan. It is located between the fan guard.

According to the first aspect of the present invention, the distance between the defrost heater and the fan is short, so that the heat of the defrost heater can easily reach the fan, and the frost attached to the fan can be completely melted. it can. Therefore, the melted defrost water condenses again and does not become icy and adhere to the fan,
Damage to the fan and failure of the motor can be prevented. Since the distance between the fan and the heater for defrosting is short, defrosting can be performed efficiently, and the defrosting time is shortened. No reduction occurs. Further, since the heater is fixed by a fixing member provided on the fan casing, the heat of the heater is transmitted by heat conduction as well as heat radiation by the fixing member, so that frost adhering to the fan casing can be removed. .

According to a second aspect of the present invention, in the cooling device according to the first aspect, the fixing member has a surface having a predetermined angle with respect to a direction in which the cool air is discharged by the fan. Then, it reaches every corner in the storage room, its temperature can be made uniform, and the quality of foods and the like can be properly maintained.

According to a third aspect of the present invention, in the cooling device according to the first aspect, since the fixing member has a portion for sandwiching the defrost heater, the operation of fixing the defrost heater can be easily performed. You can do it.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view of a cooling device 2 of a cooling storage 1 as an embodiment of a cooling device to which the present invention is applied. The cooling storage 1 is, for example, a prefabricated freezer / refrigerator, and is configured by assembling a plurality of prefabricated heat insulating panels, and is used as a rapid cooling storage for rapidly cooling foods and the like. A cooling device 2 is provided on the lower surface of the ceiling wall 1A, which is the ceiling surface 3A of the inside 3 of the cooling storage room 1.
Is attached. The cooling device 2 is housed in a fan casing 4 made of a steel plate,
Cooler 7 screwed to top plate 6 of fan casing 4
And an electric heater 5 for defrosting the cooler provided in the cooler 7, a fan 8 made of a steel plate for cooling the inside of the refrigerator, and a dew receiving plate 9 made of a steel plate attached to a lower end portion of the fan casing 4.
And a heating element H provided on the dew receiving plate 9. The fan casing 4 has an inlet 11 formed on the side of the cooler 7 and an outlet 12 formed on the side of the fan 8. A fan guard 13 made of a metal wire is attached to the outside of the discharge port 12.

A drain port 15 is formed in the lower surface of the dew receiving plate 9, and a drain hose 14 having a resin heating element 18 wound around the outer periphery thereof to prevent freezing during draining is provided. And is drawn out of the refrigerator.
The cooling device 2 is attached to the ceiling surface 3A by hangers 16, 16, 17 and 17 screwed to four corners of the fan casing 4.

Next, a cooling device 2 according to an embodiment of the present invention will be described with reference to FIG. FIG. 2 is a perspective view of the cooling device 2 as viewed from the fan guard 13 side. The fan casing 4 made of a steel plate accommodates the cooler 7, the electric motor 20 and the fan 8 therein, and a fan guard 13 made of metal wire having leg-shaped mounting portions at approximately four corners is provided with an outlet of the fan casing 4. It is screwed and fixed to the 12 side. The fan guard 13 is assembled by spot welding a metal wire at a crossing portion thereof and assembled in a mesh shape. Injury and damage to the fan due to obstacles are prevented, and the flow of cool air discharged from the fan casing 4 is not hindered. The defrosting heater 10 supported by the defrosting heater fixing members 19 fixed to the fan casing 4 has a substantially W-shape, so that the central portion 10C of the defrosting heater 10 is 8 is located almost in front, and a central portion thereof can be heated. Power lines at both ends of the heater 10 are connected to predetermined portions of a control circuit in an electric box (not shown) in the cooling device 2. The fan 8 is rotatably mounted on an electric motor 20 fixed to a mounting plate (not shown) on the upper part of the fan casing 4. Further, a cool air discharge port 12 is formed in the fan casing 4 and a burring 21 is formed on an edge of the opening so that a flow of the cool air is smooth.

Next, referring to FIG.
Will be described. FIG. 3 is a sectional view taken along line AA of FIG. The heater fixing members 19, 19 for defrosting are made of a steel plate, and a flange 1
9A and 19A, and are spot-welded to the fan casing 4 around the fan 8 by the flanges 19A and 19A. On the other hand, the defrosting heater 10 having substantially J-shaped portions 19B and 19B at the other end and having a substantially W-shaped shape is sandwiched between the substantially J-shaped portions 19B and 19B. ,
The defrosting heater fixing member 19 has a surface 19C substantially upright with respect to the fan casing 4 and around the fan 8.
19 are fixed.

With the above configuration, when the cooling operation is started, a compressor (not shown) is driven, a refrigerant is supplied from a condensing unit (not shown) to the cooler 7, and the cooler 7 exerts a cooling action by the fan 8. Fan 8
By the rotation of, the cool air in the interior 3 is sucked from the suction port 11 and exchanges heat with the cooler 7 in the fan casing 4.
It is discharged from the discharge port 12 into the storage.

If the cooling operation is continued, frost adheres to the cooler 7 and the fan 8, so that it is necessary to periodically perform a defrosting operation. The electric heater 5 for defrosting provided in the vessel 7 is energized to generate heat. The frost adhering to the cooler 7 is melted and falls as defrost water or ice blocks on the dew receiving plate 9. On the other hand, the frost attached to the fan 8 is defrosted by the heater 10 for defrosting, and falls on the dew receiving plate 9 placed at the lower part of the fan casing 4.

In this embodiment, the defrosting heater 10 is substantially W-shaped, and its heat generating portion is located substantially in front of the fan 8 by the fixing members 19, 19, and the second conventional example. Unlike the defrost heater 10, which is not fixed to the fan guard 13, the distance between the defrost heater 10 and the fan 8 is closer, and the heat of the defrost heater 10 can easily reach the fan 8. 8 can be completely melted. Therefore, the amount of frost and ice adhering to the fan 8 is not biased and the balance of the fan 8 is not lost, so that damage to the fan 8 and failure of the electric motor 20 can be prevented. Further, since the distance between the fan 8 to which the frost adheres and the heater 10 for defrosting is short, the defrosting time can be shortened,
During that time, the temperature rise in the cooling storage 1 due to the heat of the defrost heater 10 is reduced, and the quality of foods and the like is not reduced. In addition, a small heat generating capacity is sufficient, and the cost is reduced.

Next, a method of fixing the defrost heater 10 and the fan guard 13 will be described with reference to FIGS. Since the defrosting heater fixing members 19, 19 have substantially J-shaped portions 19B, 19B at the other ends, the defrosting heater 10 having a substantially W-shape can be removed from above the front surface of the fan 8. After the insertion, the straight portions 10B, 1B, 1
OB is pressed into the substantially J-shaped portions 19B, 19B of the defrosting heater fixing members 19, 19 toward the front side to be pinched. After that, the power line of the defrost heater 10 is connected to a predetermined portion of a control circuit in an electric component box (not shown) in the cooling device 2, and the leg portions at substantially four corners of the fan guard 13 are screwed to the fan casing 4. I do. The fixing operation of the defrost heater 10 is completed by such a simple operation.

Conversely, when replacing the fan 8 or inspecting or repairing the electric motor 20, the defrost heater 10 is fixed to the fan casing 4 by the defrost heater fixing members 19, 19, so that the fan guard 13 Is removed, the defrost heater 10 does not come off at the same time, so it is not necessary to remove the power line of the defrost heater 10 from an electric box (not shown). That is, only by removing the fan guard 13 from the fan casing 4, the fan 8 can be replaced or the electric motor 20 can be inspected, which is convenient from the viewpoint of maintenance such as inspection and repair of the fan 8.

Further, defrost heater fixing members 19, 19
Has surfaces 19C and 19C which are provided at a predetermined angle with respect to the direction of discharge of the cool air by the fan 8, that is, surfaces 19C and 19C which are substantially upright with respect to the fan casing 4 in this embodiment.
Since a plurality of cooling air is fixed to the fan casing 4, the cooling air generated by the fan 8 has directionality so that the cooling air can be distributed to every corner in the cooling storage 1. The prefabricated refrigerator / refrigerator shown in the present embodiment generally has a size ranging from several tsubo to several tens tsubo, and has a directivity for the cool air to reach every corner irrespective of the installation location of the cooling device. So that they can That is, when the cooling device of the present invention is provided at the center, the temperature distribution in the inside 3 of the cooling storage unit 1 becomes uniform by using the defrosting heater fixing members 19, 19 upright so that the food product can be used. Etc., so that the quality can be maintained properly for a long time.

When the cooling device 2 is located at the corner of the cooling storage 1 instead of at the center, unlike the above case, the direction of discharging the cool air is changed to the surface 1 that is substantially upright with respect to the fan casing 4.
When the temperature is not set to 9C or 19C, the air temperature in the storage 3 of the cooling storage 1 becomes uniform. That is, the defrosting heater fixing member 1
By appropriately changing the angle between the surfaces 19C, 19C of the surfaces 9 and 19 and the fan casing 4 so as to have a predetermined angle with respect to the discharge direction of the cool air by the fan 8, the wind direction of the cool air can be discharged in a predetermined direction. Thus, the cool air can be spread to every corner in the cooling storage 1.

[0022]

As described above, according to the first aspect of the present invention, the distance between the defrost heater and the fan is short, so that the heat of the defrost heater can easily reach the fan and adhere to the fan. Since the frost can be completely melted, damage to the fan, failure of the electric motor, and the like can be prevented. Since the distance between the fan and the heater for defrosting is short, defrosting can be performed efficiently, so that the defrosting time is short, and the temperature rise in the refrigerator due to the heat of the heater during the defrosting time is small, and the quality of foods and the like deteriorates. Absent.

According to the second aspect of the present invention, since the fixing member has a surface having a predetermined angle with respect to the direction of discharging the cool air by the fan, the fixing member regulates the direction of discharging the cool air and stores the cooling air. The temperature in the room can be made uniform,
The quality of foods and the like can be properly maintained.

According to the third aspect of the present invention, since the fixing member has a portion for holding the defrost heater, the operation of fixing the defrost heater can be easily performed. is there.

[Brief description of the drawings]

FIG. 1 is a sectional view of a cooling storage according to an embodiment of the present invention.

FIG. 2 is a perspective view of a cooling device according to the embodiment of the present invention.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a sectional view of a cooling storage box showing a conventional example.

FIG. 5 is a perspective view of a conventional cooling device.

FIG. 6 is a sectional view taken along line BB of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cooling storage 2 Cooling device 4 Fan casing 7 Cooler 8 Fan 10 Defrosting heater 10B Linear part 10C Central part 12 Discharge port 19 Defrosting heater fixing member 19A Flange 19B Substantially J-shaped part 19C surface 22 Fixing member

Claims (3)

[Claims] 1. A fan casing in a heat insulating box, a cooler housed in the fan casing, a fan ventilating the cooler, a fan guard for protecting the fan, and a defroster for the fan. A cooling device comprising a heater, wherein the heater is fixed by a fixing member provided on the fan casing, and the heater is located between the fan and the fan guard. . 2. The cooling device according to claim 1, wherein the fixing member has a surface having a predetermined angle with respect to a direction in which the fan discharges cool air. 3. The cooling device according to claim 1, wherein the fixing member has a portion that sandwiches the heater for defrosting.