JP3022157B2 - Cooling system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cooling device for a low-temperature showcase or the like, and more particularly to a cooling device provided with a drain pan heater on the upper surface of a drain pan.

[0002]

2. Description of the Related Art Conventionally, a low-temperature showcase (cooling device) of this kind has been disclosed, for example, in Japanese Patent Publication No. 62-21080 (F
As shown in 25D21 / 06), a cooler included in the refrigeration cycle is installed on the bottom wall of the heat insulating box, and cool air that has exchanged heat with this cooler is circulated in the refrigerator by a blower. Since the moisture in the circulating air adheres to and grows on this cooler as frost, the cooler is defrosted by the defrost heater,
In order to receive the defrost water at this time, a drain pan usually made of a metal plate such as stainless steel or aluminum is arranged below the cooler.

[0003] A drain hole is formed in the lowest part of the drain pan, and the defrost water dropped on the drain pan is discharged to the outside from the drain hole. However, the defrost water falling on the drain pan is still melted. Since uncut ice blocks and the like are included, the temperature of the drain pan also becomes low during the cooling operation. Therefore, defrost water or the like is re-frozen on the drain pan, and the drain holes are clogged, and there is a risk that drainage failure may occur.

For this reason, a drain pan heater is disposed on the upper surface of the drain pan for the purpose of heating the drain pan to eliminate the re-freezing. The drain pan heater is usually composed of a sheathed heater and is disposed over substantially the entire area of the drain pan. However, the drain pan heater expands and expands due to a rise in temperature due to its own heat generation. If such a drain pan heater is fixed to the drain pan, a phenomenon occurs in which the position of the drain pan heater is shifted as in a scale insect by repeated extension and contraction. Therefore, the drain pan heater is not fixed to the drain pan, but is held movably.

[0005]

However, if the drain pan heater is movably held on the drain pan, when the heat is generated, the heat is particularly remarkably elongated in the long side direction, and both ends are formed on the inner surface of the side wall of the box. Will abut. If the heated drain pan heater directly contacts the inner surface of the side wall, the drain pan heater itself is also damaged, and the inner surface of the side wall is also heated, causing a problem that the paint or the like is peeled off or burnt.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional technical problem, and has as its object to provide a cooling device capable of preventing the occurrence of damage due to elongation at the time of heat generation of a drain pan heater. With the goal.

[0007]

A cooling device according to the present invention comprises a box
Metal located on the bottom wall of the body, below the cooler
Drain pan and movably placed on this drain pan
And a Dorenpanhi data that has been, this Dorenpa
Heater and the long side along the longitudinal direction of the cooler
Place both ends of the long side at the side of the cooler near the side wall of the box.
With the curved part formed by bending and turning back again
And both of the curved parts project at least outward
A spacer provided with a flange is attached.

In the cooling device according to the second aspect of the present invention , the drain pan heater is a sheathed heater, and both ends of the long side are movably held at the lower edge of the fan case, and the spacer is provided. Are characterized by being constituted by upper and lower plates which are joined to each other at an outer flange portion and form a space for accommodating the curved portion inside the flange portion.

According to the present invention, a drain pan heater for heating the drain pan is provided so as to be movable, and at both ends of the drain pan heater located near the side wall of the box, the spacers projecting outward from these both ends. Since I attached
Even when both ends of the drain pan heater extend outward due to the heat generation, the spacer comes into contact with the side wall of the box. Therefore, the drain pan heater does not come into direct contact with the inner surface of the side wall of the box, and damage to the drain pan heater and the inner surface of the side wall can be avoided.

In particular, the drain pan heater is formed by bending a long side portion along the longitudinal direction of the cooler and both ends of the long side portion toward the side of the cooler in the vicinity of the side wall of the box body, and folding it back again. And the curved portion, which can heat substantially the entire area of the drain pan, and effectively absorbs the elongation of the long side during the heat generation of the drain pan heater by the curved portions at both ends, thereby suppressing the degree of deformation. Will be able to do it.

[0011] holds movably long side ends of the drain pan heater as manufactured by the sheathed heater of the invention of claim 2 at the lower edge of the fan case, the Kankakuko mutual at the outer flange portion If the upper and lower plates are formed to form a space for accommodating the curved portion inside the flange portion, no special holding tool is required for disposing the drain pan heater, The spacer can be easily formed with a simple structure.

[0012]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a perspective view of a low-temperature showcase 1 as an embodiment of a cooling device to which the present invention is applied, FIG. 2 is a vertical side view of the low-temperature showcase 1, and FIG.
Are respectively shown in plan sectional views of the cooler 17 part. In each of the drawings, a low-temperature showcase 1 is used for displaying and preserving ice cream and the like in a convenience store or the like, and is constituted by a horizontally long rectangular heat-insulating box 2 opened upward.

The heat-insulating box body 2 includes a metal outer box 3 and a metal inner box 6 which is incorporated in the outer box 3 with a space therebetween and has a surface coated with a paint such as melamine resin. , Both boxes 3,
6 and a heat insulating material 7 such as foamed polyurethane filled with an in-situ foaming method.

Duct plates 8 and 9 are attached to the inside of the front and rear surfaces of the inner box 6 at intervals.
A bottom plate 11 is detachably installed between the lower ends of the inner box 6, thereby forming a series of ducts 12 rising up and down from the bottom inside the inner box 6.
A storage room 22 is defined inside the bottom plate 9 and 9. on the other hand,
The bottom wall 13 of the heat insulating box 2 has a stepped shape having a lower portion 13A at a front portion and a higher portion 13B at a rear portion, and the bottom plate 11 is located above the higher portion 13B.

On the upper surface of the lower portion 13A of the bottom wall 13, a drain pan 14 made of a metal plate such as stainless steel or aluminum is provided, and the lowest position of the drain pan 14 communicates with the outside of the heat insulating box 2 below. Drainage hole 16
Are formed. Above the drain pan 14, a horizontally long plate fin type cooler 17 is disposed in the duct 12, and a fan case 18 provided on the front side of the cooler 17 comprises a suction type propeller fan. A plurality of blowers 19 are provided.

The cooler 17 is provided with a defrost heater (not shown).
7, and receives defrost water and ice blocks that are dropped when the cooler 17 is defrosted. The defrost water and the like received on the drain pan 14 collect in the drain holes 16 and are discharged therefrom.

Further, a drain pan heater 89 is disposed on the upper surface of the drain pan 14. The drain pan heater 89 is a sheathed heater in which a heater wire is housed in a metal pipe. The drain pan heater 89 has a long side 89A located on the cold air suction side along the longitudinal direction of the cooler 17 and both ends of the long side 89A. In the vicinity of the side surface of the inner box 6, each of the curved portions 89 is bent toward the side of the cooler 17 and folded again.
B, 89B.

On the other hand, the fan case 18 has a box shape having an open lower surface and a rear surface, and the blowers 19 are attached to the grilles formed on the inclined front surface. Then, both side walls 18 of the fan case 18
A, the holding portion 91 cut upwardly on the lower edge of 18A,
91 are formed. The drain pan heater 89 includes:
The fan case 18 and the drain pan 1 are arranged in a state where both ends of the long side portion 89A are arranged in the holding portions 91, 91.
It is held between the four so as to be movable in the left-right direction.

On the other hand, the curved portion 89 of the drain pan heater 89
Spacers 92 are attached to B and 89B, respectively.
The spacer 92 includes a lower plate 93 made of a flat steel plate having a plurality of through holes 80 as shown in FIG. 4 and an upper plate 94 made of a substantially gate-shaped steel plate also having the through holes 80. Upper plate 9
The four flange portions 94A, 94A on both sides are joined to the lower plate 93 on both side flange portions 93A, 93A, and are assembled by spot welding. Thereby, the spacer 9
2, a flange 92A having a predetermined width on both outer sides;
A storage space 92B is formed between the flanges 92A and 92A.

The spacer 92 is attached to both sides of the drain pan heater 89 by inserting and storing the curved portion 89B of the drain pan heater 89 in the storage space 92B. And the through hole 8 formed in the center of the upper plate 94
By winding a stainless steel band 90 around 5 and binding it around the outside of the curved portion 89B, the spacer 92 is configured not to come off the curved portion 89B. When the drain pan heater 89 is cold, each of the spacers 92, 9
As shown in FIG. 3, the outer flanges 92A are slightly spaced from each other on both sides of the inner box 6 as shown in FIG.

A high-order portion 13B on the rear side of the cooler 17
The stepped portion of the lower portion 13A has an inclined surface 13C such that the upper portion is separated from the cooler 17. The upper end of the duct plate 9 is a discharge port 9A, the upper end of the duct plate 8 is a suction port 8A, and wind direction plates 21, 21 which are curved inward are attached to the discharge port 9A at predetermined intervals.

On the other hand, on both sides of the opening of the heat insulating box 2, side plates 41, 41 made of a transparent acrylic resin thick plate are erected. The side plates 41, 41 have a substantially mountain shape that is inclined such that the upper portions of the front and rear sides 41A, 41B are close to each other, and a stainless steel top plate 42 is also provided between the upper end portions thereof. It is screwed from the side via 43.

The top plate 42 has a mountain-shaped cross section in accordance with the shape of the upper portions of the side plates 41, 41. The lower surface of the top plate 42 is provided with front and rear stainless steel upper support plates 44, 44, which are also made of stainless steel. A plate 46 is attached. The upper support plates 44, 44 have a predetermined distance from the lower surface of the top plate 42, and the tips thereof are inclined downward downward substantially along the inclination of the front and rear sides 41A, 41B of the side plate 41, respectively. A horizontally long fluorescent lamp 51 is housed and arranged on the lower surface of the reflection plate 46, and a stabilizer 52 for lighting the fluorescent lamp 51 is arranged on the upper surface.

On the other hand, rails 63, 63 are attached to the front and rear opening edges of the heat-insulating box 2 across the left and right. Between the rails 63, 63 and the top plate 42, the storage room 22 of the low-temperature showcase 1 is Open in the front-rear direction (opening 64, 6
4) Yes. With this configuration, the upper edges of the front and rear openings 64, 64 of the storage room 22 of the low-temperature showcase 1 are located deeper than the lower edge and open diagonally upward, and the rails 63, 63 are located below these openings 64, 64. The front and rear side surfaces of the upper support plates 44, 44 and the reflection plate 46 are located at the edges.
Will be located at the upper edge.

On the rail 63, a plurality of sliding doors 73 made of, for example, a transparent acrylic resin plate or a transparent glass are slidably mounted and supported. In this case, in the embodiment, eight doors 7 are arranged in front and rear of each of the two doors.
3 is supported, the upper part of the door 73 supported inside is supported by the front and rear side surfaces of the reflection plate 46, and the upper part of the door 73 supported outside is supported by the upper support plate 44.

At the front and rear ends of the heat insulating box 2, kick plates 26, 26 having a large number of through holes 24 are attached. The kick plates 26, 26 are located between the kick plates 26, 26. A machine room 27 is formed below. A compressor (not shown), which constitutes a known refrigeration cycle together with the cooler 17, a condenser 29, a blower 31 for the condenser, and an electric box (see FIG. (Not shown) and the like, and the rear surface of the machine room 27 is closed by a plurality of panels 36 to 38 so as to be openable and closable.
・ A plurality of are formed.

Next, the operation of the low-temperature showcase 1 having the above configuration will be described. When the compressors and the blowers 19 and 31 are operated, the cool air cooled by the cooler 17 is supplied to the inclined surface 1.
The air is blown backward from the inside of the duct 12 from 3C, and is discharged from the discharge port 9A at the upper end of the duct plate 9 toward the upper part of the storage room 22. The cool air circulated in the storage chamber 22 is sucked into the duct 12 from the suction port 8A at the upper end of the duct plate 8 and circulates back to the blower 19 (indicated by a broken arrow in FIG. 2).
Thereby, the inside of the storage room 22 is cooled to a freezing temperature of, for example, -20 ° C.

Since the frost grows on the cooler 17 by the cooling operation, the defrost heater of the cooler 17 is energized at predetermined time intervals to generate heat and melt the frost attached to the cooler 17. At the same time, the drain pan heater 89 is also energized, and the drain pan heater 89 generates heat and the drain pan 14
Is heated, the defrost water and the ice blocks received on the drain pan 14 are prevented from being re-frozen as described above, and can be smoothly discharged from the drain hole 16. In particular, since a plurality of through holes 80 are formed in the spacer 92, heat from the curved portion 89B is smoothly radiated to the outside.
As a result, the ambient temperature on the side of the cooler 17 also increases, so that the freezing of the drain pan 14 at that portion can be effectively eliminated.

Here, the drain pan heater 89 expands and expands due to a rise in temperature due to its own heat generation. In particular, the long side portion 89A significantly expands in the left-right direction, whereby the curved portions 89B, 89B at both ends move in the left-right outside direction. However, in the present invention, the curved portions 89B, 89B
Since the spacers 92, 92 are respectively provided in the inner box 6, even if the curved portions 89B, 89B move outward, the outer flanges 92A, 92A of the spacers 92, 92 will not move.
Will be in contact with the inner surfaces on both sides of the. Therefore, the drain pan heater 89 does not come into direct contact with the inner surface of the inner box 6, and it is possible to prevent the drain pan heater 89 from being damaged or the coating of the inner box 6 being peeled off or scorched. become.

In particular, the drain pan heater 89 is connected to the cooler 1
7, a long side 89A along the longitudinal direction, and the long side 89
Since both ends of A are bent toward the side of the cooler 17 and are formed by bending back again, substantially the entire area of the drain pan 14 can be heated, and the heat generated by the drain pan heater 89 can be generated. The elongation of the long side portion 89A at the time is effectively absorbed by the curved portions 89B, 89B at both ends, and the degree of deformation can be suppressed.

The long side 89 of the drain pan heater 89
A Both ends of the upper and lower plates 9 are held movably by lower edge holding portions 91, 91 of the fan case 18 and the spacers 92 are joined to each other at outer flanges 92A, 92A.
4, 93, and a storage space 92B for storing the curved portion 89B inside the flanges 92A, 92A.
Is formed, no special holding tool is required for disposing the drain pan heater 89, and the spacer 92 can be easily formed with a simple structure.

In the embodiment, the present invention is applied to a low-temperature showcase. However, the present invention is not limited to this, and is effective for refrigerators, air conditioners, and other various cooling devices.

[0033]

As described above in detail, according to the present invention, a drain pan heater for heating a drain pan is provided so as to be movable, and both ends of the drain pan heater located near the side wall of the box are located at a higher position than these ends. Since the spacer that protrudes outward is attached, the drain pan heater extends due to heat generation,
Even if both ends move outward, the spacer comes into contact with the side wall of the box. Therefore, it is possible to prevent the drain pan heater from directly contacting the inner surface of the side wall of the box, and to prevent the drain pan heater and the inner surface of the side wall from being damaged.

In particular, the drain pan heater is formed by bending a long side portion along the longitudinal direction of the cooler and both ends of the long side portion toward the side of the cooler in the vicinity of the side wall of the box body, and then folding it back again. And the curved portion, which can heat substantially the entire area of the drain pan, and effectively absorbs the elongation of the long side during the heat generation of the drain pan heater by the curved portions at both ends, thereby suppressing the degree of deformation. Is what you can do.

Further, the movably holds the long side ends of the drain pan heater as manufactured by the sheathed heater of the invention of claim 2 at the lower edge of the fan case, the Kankakuko mutual at the outer flange portion If the upper and lower plates are formed to form a space for accommodating the curved portion inside the flange portion, no special holding tool is required for disposing the drain pan heater, The spacer can be easily formed with a simple structure.

[Brief description of the drawings]

FIG. 1 is a perspective view of a low-temperature showcase to which the present invention is applied.

FIG. 2 is a vertical side view of a low-temperature showcase to which the present invention is applied.

FIG. 3 is a plan sectional view of a cooler portion of a low-temperature showcase to which the present invention is applied.

FIG. 4 is a perspective view of a curved portion and a spacer of a drain pan heater of a low-temperature showcase to which the present invention is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Low-temperature showcase 2 Insulated box 6 Inner box 13 Bottom wall 14 Drain pan 17 Cooler 18 Fan case 19 Blower 89 Drain pan heater 89A Long side 89B Curved part 91 Holding part 92 Spacer 92A Flange 92B Storage space

──────────────────────────────────────────────────の Continued on the front page (72) Inventor Yoshihisa Ishida 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Shuji Kashide 2-5-2 Keihanhondori, Moriguchi-shi, Osaka No. 5 Sanyo Electric Co., Ltd. (72) Inventor Toyosaku Hamada 2-5-5 Keihanhondori, Moriguchi City, Osaka Prefecture Sanyo Electric Co., Ltd. (72) Hiroshi Hayashi 2-5, Keihanhondori, Moriguchi City, Osaka Prefecture No. 5 Sanyo Electric Co., Ltd. (72) Kazuo Kato 2-5-5 Keihanhondori, Moriguchi-shi, Osaka Prefecture No. 5 Sanyo Electric Co., Ltd. (72) Shinji Iura 2-chome Keihanhondori, Moriguchi-shi, Osaka No. 5 No. 5 Inside Sanyo Electric Co., Ltd. (56) References JP-A-63-263378 (JP, A) JP-A-3-42988 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB Name) F25D 21/08 F25D 21/14

Claims (2)

(57) [Claims] 1. An upper surface of a bottom wall of a box, which is located below a cooler.
And a metal drain pan placed on the drain pan
A drain pan heater movably arranged;
The renpan heater is connected to the long side along the longitudinal direction of the cooler.
Part and both ends of the long side part in the vicinity of the side wall of the box body.
Bend each side of the cooler and turn it back again
It is composed of the formed curved part, and both curved parts have at least
Also fitted spacer with flange protruding outward
A cooling device characterized by the above-mentioned. 2. The drain pan heater is a sheathed heater.
And both ends of the long side can be moved at the lower edge of the fan case
And the spacer is attached to the outer flange part.
Are joined to each other with a curved portion inside the flange portion.
It consists of upper and lower plates that form a space for storing
The cooling device according to claim 1, wherein the cooling device is provided.