JP2002257459A - Defrosting device for cooler in refrigerating and freezing showcase - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a defrosting device for a cooler in a refrigerating and freezing showcase, which efficiently transfers heat to the entire cooler while suppressing temperature rise in the case. SOLUTION: Side end surfaces of a plurality of plate fins 8c that constitute the cooler 8 are located on the surface of a heatable heat-conducting plate 8b being in contact therewith by plane. Accordingly, a large effective heat conducting area can be ensured and heat is efficiently transferred to the entire cooler 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a defroster for a cooler in a freezing / refrigeration showcase.

[0002]

2. Description of the Related Art Conventionally, there has been a frozen / refrigerated showcase having a cooling function for displaying frozen / refrigerated foods, fresh foods, and the like at a food store such as a supermarket, a convenience store, and a department store. By providing a cooler and a blower so as to form a cool air circulation path in the product storage space of the frozen / refrigerated showcase, the inside of the frozen / refrigerated showcase is circulated and cooled.

[0003] However, since the air taken in from the cold air inlet contains moisture, when the air is cooled by the cooler, the moisture in the air is rapidly cooled. Frost adheres to a plurality of built-in heat exchange fins and the like, and if the frost adheres and continues to grow, it becomes ice frost, which significantly reduces the cooling capacity of the cooler.

As a method for removing frost adhering to the fins, there are JP-A-62-217075 and JP-A-2-8678. The former is a method in which a defrost heater is arranged on the front of the cooler, and the warmed air is transmitted through the cooler by a blower to defrost, and the latter is a method in which a defrost heater is arranged on the lower surface of the cooler, and the heater is provided. Is a method of defrosting by direct heating.

In particular, the latter direct heating defrosting method using a defrosting heater will be described with reference to FIG. 6. FIG. 6 is an exploded perspective view of a conventional plate fin type cooler. Two U-shaped defrosting heaters 08a having excellent heat conduction efficiency are mounted on the upper surface of the perforated plate 08d provided with a plurality of holes, and thin plate fins 08c are mounted on the heater 08a in the longitudinal direction of the freezing / refrigeration showcase. Are arranged vertically in a row.

When electricity is supplied from one end of the U-shaped defrost heater 08a to the other end, heat is generated, and the lower end of the plate fin 08c gradually comes into contact with the heater 08a from the place where the lower end is in contact with the heater 08a. By conducting the heater heat, the entire fin 08c can be heated, and the fin 08c can be heated.
It becomes possible to defrost frost and ice frost attached to c. The thawed frost falls on the upper surface of the perforated plate 08d, and flows down from the perforated plate 08d or the end of the perforated plate 08d.
The structure was such that water was drained to the drain port 012a provided in No. 9.

[0007]

However, in the former defrosting method in which the warmed air passes through the cooler, the warmed air circulates in the cool air circulation path, so that the temperature inside the refrigerator is temporarily reduced. As a result, the cooling efficiency was lowered, and the cooling efficiency was lowered, so that extra energy was required for re-cooling after defrosting. In the latter case (described with reference to FIG. 6), since the plate fin is partially heated, the cooler is hardly heated uniformly, and the molten water drops fall on the heated defrost heater.
Because the temperature inside the refrigerator rises due to evaporation, water droplets not only adhere to the products placed in the refrigerator, but also the heater uses a metal having excellent thermal conductivity (such as copper). ,
The main cause was rusting and deterioration due to the adhesion of water droplets, and maintenance was troublesome.

The present invention has been made in view of such a problem, and it is possible to efficiently conduct heat to the entire cooler while suppressing an increase in the internal temperature of the refrigerator, and to cool the refrigerated / refrigerated showcase. It is an object of the present invention to provide a defrosting device for a vessel.

[0009]

In order to solve the above-mentioned problem, a defroster for a cooler in a freezing / refrigeration showcase according to the present invention uses a cooler and a blower provided in a cool air circulation path to open air to an open portion. What is claimed is: 1. A defroster for a cooler in a freezer / refrigerator showcase formed by forming a curtain to keep goods in the refrigerator cool, wherein a plurality of plate fins constituting the cooler are provided on a lower surface of an upper surface of a heat conductive plate which can be heated. It is characterized in that it is erected and arranged in surface contact. According to this feature, since the side end surface of the plate fin is in surface contact with the heat conductive plate, a large effective electric heating area can be obtained, and heat can be efficiently transmitted to the entire cooler.

[0010] In the defrosting device for a cooler in a freezing / refrigeration showcase of the present invention, a defrosting heater is disposed on the other side of the heat guide plate facing the plurality of plate fins and facing the outside of the cool air circulation path. Is preferred. According to this configuration, since the heat guide plate is heated by the defrost heater from outside the cool air circulation path, defrosting can be reliably performed while suppressing an increase in the temperature in the refrigerator. Even if it becomes water, the heat guide plate acts as a barrier for the defrost heater, and since water does not directly adhere thereto, deterioration of the defrost heater due to moisture can be prevented.

[0011] In the defrosting device for a cooler in a freezing / refrigeration showcase of the present invention, it is preferable that the defrosting heater is supported by an exchange plate that is detachable from the heat guide plate. With this configuration, the defrost heater is outside the cool air circulation path and is detachably attached to the heat guide plate, so that the defrost heater can be easily assembled and disassembled during maintenance and inspection.

[0012] In the defroster for a cooler in a freezing / refrigeration showcase of the present invention, it is preferable that drainage from the cooler is led out of the cool air circulation path. In this way, when the frost is melted, the odor contained in the moisture can be prevented from flowing into the product storage space of the frozen / refrigerated showcase, and the hygiene is also highly effective.

[0013] It is preferable that the defroster for a cooler in the freezing / refrigeration showcase of the present invention stop the blower when the heat guide plate is heated. By doing so, at the time of defrosting, the cooler is only locally heated by the heat of the heat guide plate, and the hot air is not circulated by the blower as in the conventional case, so that the temperature rise in the refrigerator can be suppressed. it can.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIG. 1 is a side sectional view of a refrigerated / refrigerated showcase 1 to which a defroster 8 for a cooler in a refrigerated / refrigerated showcase of the present invention is applied, and FIGS. FIG. 5 shows an assembling process of the cooler applied to the case 1, and FIG.
It is a perspective view showing the state where it was attached in the cooling circulation path.

FIG. 1 shows a reach-in case type refrigerated / refrigerated showcase 1 provided with an opening / closing door 3 for keeping drinking water such as canned juice installed in a convenience store or the like.
The refrigerated / refrigerated showcase 1 includes an outer box 1a and an inner box 1b having an open front, and an opening / closing door 3 capable of opening and closing the front of the boxes 1a and 1b. A plurality of display shelves 4 for partitioning the internal product storage space 2 are provided, and lamps 6 for illuminating the products are mounted near the opening / closing door 3 on the inner side surface. In addition, a cold air circulation path 5 is formed between the outer box 1a and the inner box 1b to keep the product cool, and a plate-fin type cooler 8 is provided.
And by providing the blower 9, the upper cool air outlet 10 to the lower cool air inlet 11
Cold air flows down (the flow of cold air is indicated by the arrow in the figure)
By forming an air curtain, the product storage space 2
Cooling inside.

As a system for controlling the temperature of the freezing and refrigerated showcase 1, an overheat prevention thermo 9 a attached to the center of a blower 9 that draws air from a cold air inlet 11 and sends it to a cooler 8, and cooler 8 The cooled air is cooled by the cool air circulation sensor 18 attached to the cool air circulation path 5 on the back plate side of the freezing / refrigeration showcase 1 formed between the inner box 1b and the outer box 1a.・
Two outlet sensors 16 mounted near the ceiling of the refrigerated showcase 1 and flowing down from the cool air outlet 10 to the product storage space 2, and an in-room sensor mounted near the display shelf 4 on which products are placed 17, the structure can be controlled so as to always maintain a constant temperature.

However, when the air blown by the blower 9 is cooled by the cooling coil 8e in the cooler 8, if the air contains moisture, the humidity is reduced by the plate fins 8c and the cooling coil 8e. Since the cold air circulation path 5 in the cooler 8 is blocked by the frost adhering to the like and further becoming ice frost, in the present invention, heat conduction to the plate fins 8c is efficiently performed by the heat guide plate 8b. It was made to take frost.

The structure of the defrosting device in the cooler 8c of the present invention will be described in detail with reference to FIGS. 2 to 4. As shown in FIG. A support portion 8b-1 provided with a concave portion 8b-2 is provided, and side plates 8h for supporting the top plate 8g are attached to the left and right sides of the lower portion of the top plate 8g on the upper surface direction side of the heat guide plate 8b. .

Therefore, the lower end surface of the side plate 8h is
By being attached to the upper surface of b, a space surrounded by the top plate 8g, the left and right side plates 8h, and the heat conducting plate 8b is formed. In this space, a plurality of thin metal plate fins 8c having excellent heat conductivity and heat dissipation are arranged in the longitudinal direction of the refrigerator / refrigerated showcase 1 shown in FIG. The upper surface of the plate fin 8c is joined to and attached to the lower surface of the top plate 8g. Further, the lower end surfaces of the plurality of plate fins 8c and the lower end surfaces of the side plates 8h are mounted in surface contact with the upper surface of the heat guide plate 8b. Thus, the efficiency of heat conduction from the heat guide plate 8b to the plate fins 8c can be increased.

FIG. 3 shows the above-mentioned plate fin 8c.
The process of attaching the electric heating coil type defrost heater 8a to the lower part of the heat guide plate 8b to which the lower end surface of the top plate 8g and the lower end surface of the side plate 8h supporting the top plate 8g are shown. Heat conducting plate 8b
The portion to which the defrost heater 8a is attached is a cool air circulation path 5.
One end side of the defrosting heater 8a which is outside and bent in a U-shape is installed in the concave grooves 8f-1 of the two left and right exchange plates 8f.

The other end of the defrosting heater 8a is connected to the left and right two exchange plates 8f of the heat guide plate 8b so as to be mounted on the recess 8b-2 of the support portion 8b-1 of the heat guide plate 8b. It is moved in the direction of the arrow while being fitted into a U-shaped inner surface formed by the support portion 8b-1 formed at the lower left and right ends and the lower surface of the heat conductive plate 8b. When the defrost heater 8a is set at the assembling position, the bolt holes 8b-3 of the heat guide plate 8b and the bolt holes 8f-2 of the replacement plate 8f coincide with each other, so that the bolts can be fixed. The cooler 8 provided with 8a is assembled.

FIG. 4 is a front view of the cooler 8 in which the left and right exchange plates 8f positioned by the bolt holes 8f-2 are firmly fixed to the heat conducting plate 8b by bolts 14 and nuts 15. The cooling coil 8e penetrates the plate fins 8c from the left and right side plates 8h, and is attached so as to extend all over the inside of the cooler 8 vertically and horizontally, so that the cooling coil 8e can efficiently cool the air inside the cooler 8. Has become.

Since the defrost heater 8a is fixed in close contact with the heat conducting plate 8b, the heat of the defrost heater 8a is first transmitted to the heat conducting plate 8b, and then from the heat conducting plate 8b to the side plates 8h and the plate fins 8c. By conducting heat to the entire cooler 8 without wasting the heat of the defrost heater 8a by conducting the heat to the cooling coil 8e and the top plate 8g, the frost and ice frost attached to the cooler 8 are quickly melted. Can be.

FIG. 5 showing the cooler and its surroundings and FIG. 1 showing a sectional side view of the freezing / refrigeration showcase are used to remove frost and ice frost adhering to the cooler 8 (particularly around the cooling coil 8e). A method of draining water flowing out by melting by the frost heater 8a will be described. Heat guide plate 8 of cooler 8
b is slightly inclined with respect to the direction of the drain port 12a in order to efficiently flow the water that has been dissolved and drained to the drain port 12a. When this drainage flows out of the cooler 8 to which a plurality of plate fins 8c are attached, a plurality of cutouts formed in the blower guide plate 13 for guiding the air sent by the blower 9 into the cooler 8. Into the floor 13 under the air flow guide plate 13 outside the cool air circulation path 5, and to the drain port 12 provided in the floor 19.
flows to a.

The drainage collected at the drain 12a is shown in FIG.
Is discharged from the drainage outlet hole 12b, so that the wastewater does not accumulate on the floor 19, and the odor of the wastewater is displayed on the frozen / refrigerated showcase 1. It is possible to prevent the water from flowing into the storage space 2 beforehand, which is effective in terms of hygiene.

Although the embodiments of the present invention have been described with reference to the drawings, the specific configuration is not limited to these embodiments. For example, in the present invention, an electric heating coil type defrost heater 8a is used as a heat source of the heat guide plate 8b. Is applied, a heater using a Peltier element may be applied, and changes and additions within a range not departing from the gist of the present invention are also included in the present invention.

[0028]

The present invention has the following effects.

(A) According to the first aspect of the present invention, since the side end surfaces of the plate fins are in surface contact with the heat conducting plate, a large effective electric heating area can be obtained and heat can be efficiently transmitted to the entire cooler.

(B) According to the second aspect of the present invention, defrosting can be surely performed while suppressing an increase in the internal temperature, and furthermore, even if the frost is melted and turned into water, the heat conducting plate is removed. It serves as a barrier for the frost heater and does not directly adhere to water, so that deterioration of the defrost heater due to moisture can be prevented beforehand.

(C) According to the third aspect of the invention, since the defrost heater is outside the cool air circulation path and is detachably attached to the heat guide plate, the defrost heater is assembled at the time of maintenance and inspection. Easy to disassemble.

(D) According to the invention of claim 4, when the frost is melted, the odor contained in the water can be prevented from flowing into the product storage space of the frozen / refrigerated showcase, and the sanitation can be prevented. There is also a high effect on the top side.

(E) According to the fifth aspect of the present invention, at the time of defrosting, only the heat of the heat guide plate is used to locally heat the cooler.
Since the hot air is not circulated by the blower as in the related art, it is possible to suppress an increase in the temperature inside the refrigerator.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a refrigerated / refrigerated showcase to which a defroster for a cooler in a refrigerated / refrigerated showcase according to the present invention is applied.

FIG. 2 is a perspective view showing an assembling process of a defroster for a cooler in a freezing / refrigerated showcase.

FIG. 3 is a perspective view showing a process of attaching a defrost heater in a process of assembling the cooler.

FIG. 4 is a front view of a defrosting device for a cooler in a freezing / refrigeration showcase.

FIG. 5 is an enlarged perspective view showing a defroster for a cooler in a freezing / refrigerated showcase to which the present invention is applied and the periphery thereof.

FIG. 6 is an exploded perspective view showing a cooler and its surroundings in a conventional freezer / refrigerated showcase.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Freezer / refrigeration showcase 1a Outer box 1b Inner box 2 Commodity storage space 3 Opening / closing door 4 Display shelf 5 Cool air circulation path 6 Lamp 7 Insulation material 8 Cooler 8a Defrost heater 8b Heat guide plate 8b-1 Support part 8b-2 Recess 8b-3 Bolt hole 8c Plate fin 8d Perforated plate 8e Cooling coil 8f Replacement plate 8f-1 Depressed groove 8f-2 Bolt hole 8g Top plate 8h Side plate 9 Blower 9a Overheat prevention thermometer 10 Cold air outlet 11 Cold air inlet 12 Drain pipe 12a Drainage port 12b Drainage outlet hole 13 Ventilation guide plate 13a Notch section 14 Bolt 15 Nut 16 Blow-out sensor 17 Inside sensor 18 Cool air circulation sensor 19 Floor

Claims (5)

[The claims] 1. A defrosting device for a cooler in a refrigeration / refrigeration showcase, wherein an air curtain is formed in an open portion by a cooler and a blower provided in a cool air circulation path to keep products in the refrigerator cool, A defroster for a cooler in a freezing and refrigerated showcase, wherein a plurality of plate fins constituting the cooler are arranged upright on the upper surface of a heatable heat guide plate in surface contact with the lower end surface thereof. 2. The cooling device according to claim 1, wherein a defrost heater is provided on the other side of the heat guide plate facing the outside of the cold air circulation path facing the plurality of plate fins. Defrosting device. 3. The defrosting device for a cooler in a freezing / refrigeration showcase according to claim 2, wherein the defrosting heater is supported by an exchange plate that is detachable from the heat guide plate. 4. The defroster for a cooler in a refrigeration / refrigeration showcase according to claim 1, wherein drainage from the cooler is led out of the cool air circulation path. 5. The defroster for a cooler in a refrigeration / refrigeration showcase according to claim 1, wherein the blower is stopped when the heat guide plate is heated.