JPH028678A - Cooling device having defrosting heater - Google Patents

Abstract

PURPOSE:To facilitate a fixing or a removal of a defrosting heater as much as possible by a method wherein several holes for processing frost are formed and a pulling member having a defrosting heater mounted on its upper surface is arranged within recesses formed at both ends of the cooler in such a way as it may be inserted or pulled out. CONSTITUTION:Recesses 51 are formed at portions corresponding to fin lower end positions of tube plates 50 arranged at both end surfaces of an evaporator 20. In turn, a heater pan 52 is provided with a defrosting heater 19 at its upper surface and at the same time several holes 53 for processing dew are provided. A fixing or removal of the defrosting heater 19 for the evaporator 20 is carried out by putting or removing the heater pan 52 into or out of the recess 51 formed in the plate 50. With this arrangement, it is possible to perform quite easily a fixing or removing operation of the defrosting heater to the cooling device.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] Industrial Field of Use The present invention relates to an improvement in the structure of a cooler provided with a defrosting heater and disposed in a cooling chamber separated from a product storage chamber.

Conventional technology There are two types of coolers in cooling boxes: pipe-on-sheet types installed on the outer surface of the inner box, and plate fin types. The pipe-on-sheet type was often used, and the plate-fin type was mainly used for refrigeration. However, pipe-on-sheet type coolers are limited to those using natural convection cooling methods and are not compatible with forced convection type coolers, so plate-fin type coolers are increasingly being used for refrigeration. It's here. However, by performing forced convection of cold air, the cold air returns to the cooler while containing moisture, causing frost to form on the cooler.
As disclosed in Japanese Unexamined Patent Publication No. 164 and Japanese Utility Model Application Publication No. 10385/1983, a heater for defrosting is attached to the cooler.

Problems to be Solved by the Invention The above-mentioned Japanese Patent Application Laid-open No. 61-256164 relates to a routing structure for a defrosting heater in a cooler. A plurality of U-shaped grooves are provided on the outer side of the rear stage, and the heater pipe is engaged with each groove so as to straddle the grooves. However, it is necessary to assemble and engage the heater pipes with the cooler enclosure before installing the cooler at the installation location, and after installation, it is necessary to connect the heater pipes to the cooler due to whether or not there is enough space at the location where the cooler is installed. There is a problem in that the heater cannot be attached or detached unless the heater is removed, making the task of attaching and detaching the heater cumbersome, and furthermore, it cannot be attached or detached easily.

On the other hand, Japanese Utility Model Application Publication No. 63-10835 also discloses a structure in which a sheathed heater for defrosting is closely fixed to a vertically elongated cooler.

To attach and detach the heater in this case, it is sufficient to insert both ends of the U-shaped heater from below the cooler between each end plate of the cooler and the adjacent fins, but normally a sheathed heater Since a lead wire is connected to the end portion and this lead wire portion is inserted first, there is a problem that wiring work after fixing becomes difficult.

SUMMARY OF THE INVENTION An object of the present invention is to provide a cooler in which a defrosting heater for defrosting the cooler can be easily attached to and removed from the cooler.

[Structure of the Invention] Means for Solving the Problems A cooler equipped with a defrosting heater according to the present invention has a notch for arranging the defrosting heater in the portions of both end plates of the cooler that correspond to the lower ends of the fins. A drawer member is provided with a plurality of holes for dew treatment, and a defrosting heater is provided on the upper surface of the drawer member, which can be freely inserted into and taken out from the notch.

The notches formed in the working end plates function as a positioning member and a guide member when attaching and detaching the drawer member, and the drawer member functions as a mounting member for the defrosting heater, a heat transfer member, and a dew treatment member.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 4.

(1) is a cooling box body such as a refrigerated showcase, which consists of a lower condensing unit part (2) placed on the floor via a base (4) and an upper product storage part (3) with an open front. The condensing unit part (2) has a compressor (5), condenser, etc. stored inside it, and the product storage part (3) has an outer box (7) and an inner box (8) each with an open front. A foam heat insulating material (9) is filled in between.(6) is a front cover (10) disposed on the front of the condensing unit part (2), and a front cover (10) is formed by filling the opening of the product storage part (3). (11) is the inner box (
8) and the front transparent body (10) and the bottom described later? The storage chamber is formed by (18), and (12) is an entrance for stored items formed in the rear wall (3D) of the product storage section (3). (13
) is an insulating door that closes the entrance/exit (12), and is formed by filling insulating material between the inside and outside panels, and closes the entrance/exit (12).
A backing (14) for airtightness is interposed between the rear peripheral edge of the heat insulating door (13) and the front surface of the heat insulating door (13). (15)
is a fluorescent light placed in a lighting chamber arranged in the width direction of the showcase on the ceiling wall (3E) of the product storage section (3), and below it is a multi-layered light that has heat insulation and translucency. Transparent body (1
6) is installed. (25) is a storage room (17) which will be described later.
) is a product storage shelf arranged horizontally within the space.

(17) is a cooling room partitioned off from the storage room (11) by the bottom 1 (18) at the bottom of the product storage part (3), and the first heater (17) for defrosting is energized during defrosting operation on the bottom. A plate fin type evaporator (20) as a cooler in which a
)・Blower device (22) located on the negative side of the evaporator (20), including a blower fan (21) that stops during defrosting operation・Fan case (24) that forms the ventilation port (23) of the fan (21) ) and a second fan defrosting heater (27) located on the lower surface of the fan case bottom wall (26) and energized during defrosting operation
), and a drainage device (28) is provided on the bottom wall (17A) of this cooling chamber.

The evaporator (20) has tube plates (5) as end plates on both end faces thereof.
0) is installed on the bottom wall (17A) of the cooling chamber (17), and its upper surface is covered with a spacing member (29) to form a space for retaining warm air between it and the lower surface of 18). are doing. In addition, a notch (51) is formed in the depth direction in the tube plate (50) at a portion corresponding to the lower end position of the fins that are arranged in parallel at intervals (P), and this notch (51) is used for defrosting. The heater plate (5) is equipped with a first heater (19) arranged in a meandering manner on the upper surface and serves as a drawer member made of a metal with good thermal conductivity.
2) is held so that it can be put in and taken out freely. As shown in FIG. 1, this heater plate (52) has a notch (5
A perforated plate portion (54) inserted into the portion 1〉, equipped with a heater (19), and provided with a large number of holes (53〉) for dew treatment.
The evaporator (20) is installed vertically from this perforated plate (54).
) is located on the suction side of the fins and has a ventilation hole (55) formed with a width (Q) larger than the interval (P) between the fins.
6). The cold air containing moisture and returning at a negative temperature causes ice and frost to grow on the evaporator (20), reducing the cooling capacity. In addition to delaying the growth of frost adhering to the room and prolonging the period until the opening of the frost room, during defrosting operation, the heat conduction from the perforated plate part (54) warms the evaporator (20) as well as defrosting itself. Defrosting of the evaporator (20) is promoted by radiating heat toward the air inlet side.

In addition, a cold air inlet (30) is formed on the negative side edge (front edge in this example) of the sole (18), and a cold air outlet (31) is formed on the other side edge (rear edge in this example). A perforated plate (33) with a large number of holes (32) is provided at the cold air suction port (30), and a suction log guide (34) extending downward and having an inwardly bent tip is provided. It is set up. It should be noted that the moisture that enters the storage chamber (11) when the insulation door (13) is opened or closed is included in the cold air that returns at a negative temperature, reaches the cold air intake port (30), and forms frost near this intake port. Since frost tends to grow in this area, third heaters (35A) (35B), which are always energized after the power is turned on, are installed at the bottom of the suction port and on the front wall of the inner box to defrost this area.

On the other hand, a perforated plate (37) with a large number of holes (36) is installed at the cold air Suita outlet (31), and below this perforated plate (37) there are holes extending downward to guide the cold air upward. Information section (3
9) and a regulating portion (40) extending from the guide portion (39) toward the top or side surface of the evaporator (20). The regulating portion (40) of the directing plate (38) facilitates the flow of cold air that has been cooled through the evaporator (20) and exits from the side of the evaporator toward the outlet side during cooling operation, and also stops the blower fan (21). Warm air that rises to the top surface of the evaporator during defrosting operation is made to easily stay in the space above the evaporator, thereby suppressing the flow toward the outlet side.

On the other hand, the bottom wall (26) from the second heater (27) for fan defrosting disposed on the bottom wall (26) of the fan case (24)
A considerable amount of heat is required to melt and remove the ice and frost attached to the blower fan (21) by heat transfer to the fan (21).
It is difficult to dissolve and remove it within normal defrosting operation time. There, the bottom wall (26) receives heat from the second heater (27).
The fan case (
A heat radiation opening (41) having a width approximately equal to the diameter of the fan is formed in the bottom wall (26) of 24) below the blower fan. However, the second heater (27) is connected to this opening (41).
It is to be placed directly below.

Note that the number of openings (41) is not limited to one, nor is the width limited to the diameter of the fan;
The size and number may be appropriately selected so that heat can be radiated from the blower fan (27) to the blower fan (21>).

〔Effect of the invention〕

As described in detail above, according to the present invention, the defrosting heater can be attached to and removed from the cooler by simply inserting and removing the drawer member into the notch formed in the end plate. This simplifies the work and allows attachment and detachment as long as there is enough room to position the drawer member in the space on the air inlet side of the cooler. In addition, since the direction of the drawer member when it is attached or detached is restricted by the notch, it is easy to attach or detach even if the cooler is located in an area that is difficult to see. Since the notch is formed, the radiant heat of the defrosting heater can be radiated not only to the cooler side but also to the drawer member and eventually to the wall where the cooler is located, making it possible to effectively defrost the cooler and the surrounding area. I can do it.

[Brief explanation of the drawing]

Each figure shows an embodiment of the present invention, and FIG. 1 is a partially sectional perspective view showing the cooler and its surroundings in the cooling room, and FIG.
3 is a vertical sectional view of the cooling box, and 4150 is a partially sectional perspective view showing the suction port and its surroundings in the cooling chamber. (1)...Cooling box body, (17)...Cooling chamber, (
19)...defrosting heater, (20)...evaporator (
= cooler), (5O>... end plate, (51)...
Notch, (52)...Drawer member, (54)...Perforated plate part, (56)...Defrost part.

Claims (1)

[Claims] 1. A notch for arranging a defrosting heater is formed in the portions of both end plates of the cooler corresponding to the lower ends of the fins, a number of holes are formed for dew treatment, and the defrosting heater is installed on the upper surface thereof. A cooler equipped with a defrosting heater, characterized in that a drawer member is disposed in the notch so as to be freely put in and taken out.