JPH0331679A - Cooling device - Google Patents

Abstract

PURPOSE:To permit efficient cooling and defrosting by a method wherein a box body is formed of a fan panel, side panels and a drain pan while a defrosting heater, having an evaporator and a movable reflecting plate, is provided in the box body and a fan motor is equipped at the outside of the box body. CONSTITUTION:A box body is formed of a fan panel 1, side panels 2 and a drain pan 3 while a defrosting heater 15, having an evaporator 4 and a movable reflecting plate 21, is equipped in the box body. The movable reflecting plate 21 is constituted so as to be opened when a fan motor 7 equipped at the outside of the box body is started and closed when the fan motor is stopped. Upon cooling, the movable reflecting plate 21 is opened by air pressure to form a suction port for passing the air through the evaporator 4. Upon defrosting, the supply of refrigerant for the pipeline 4a of the evaporator 4 is intercepted and the rotation of the fan motor is stopped simultaneously whereby the passing of air through the evaporator 4 is stopped and the movable reflecting plate 21 is closed. At the same time, the defrosting heater 15 is conducted and defrosting is started. The heat of the defrosting heater 15 is transferred to the evaporator 4 as radiation heat by the operation of the movable reflecting plate 21.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a cooling unit installed on the top wall of a prefabricated refrigerator or the like.

2. Description of the Related Art A conventional embodiment will be described with reference to FIGS. 4, 6, and 6. FIG. 4 is a perspective view of a conventional cooling unit, FIG. 6 is a longitudinal cross-sectional view of the conventional cooling unit, and FIG. 6 is a cross-sectional view of the conventional cooling unit.

4, 6, and 6, 1 is a fan panel formed from a top plate 1a and a fan orifice 1b. 2 is a side panel consisting of a left plate 2a and a right plate 2b. 3 is a drain pan and the fan spring /l/1. It constitutes an outer frame together with the left plate 2a and right plate 2b of the side spring /l/2 and the drain pan.

Reference numeral 4 denotes an evaporator, which is composed of pipes 4a, fins 4b, and end plates 4c, and the fan panel 1 and drain pan 3 that constitute the outer frame are fixed to the end plates 4c of the evaporator 4 with screws.

6 is a heater for defrosting, and a reflector plate 11 having one end formed into a circular shape.
It is fixedly attached to the inside of the circle. 6
is screwed to the fan spring/L/1 by the motor mount. 7 is a fan motor, which is fixed to the motor mount 6 with screws. A fan 8 is attached to the bearing of the fan motor 7.

9 is a drain pan pipe which is brazed to the drain pan 3. Front hanger par 10a and rear hanger/<-1ob
are both screwed to the end plate 4c of the evaporator 4. Reference numeral 11 denotes a reflector, which is mounted obliquely above and in front of the suction port.

The cooling unit is suspended on the ceiling wall of a refrigerator or the like.

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

First, during cooling, refrigerant flows through the piping 4a of the evaporator 4, the fan 8 is rotated by the operation of the fan motor 7, and air is discharged into the refrigerator through the evaporator 4 and the fan orifice 1b due to wind pressure. Ru. When the air passes through the evaporative lake 4, the refrigerant in the pipe 4a evaporates, and the air is cooled by the latent heat of evaporation. As cooling progresses, water vapor contained in the air flows into the evaporator 4.
condenses as frost on the surface. As frost accumulates.

The amount of air passing through the evaporator 4 gradually decreases, and the heat exchange between the refrigerant and the air also decreases accordingly, resulting in a decrease in cooling capacity. To release this, after cooling for a certain period of time, the supply of refrigerant to the pipe 4a of the evaporator 4 is cut off by the operation of a defrost timer (not shown), etc. At the same time, the rotation of the fan motor 7 is stopped, and the air is It no longer passes through the evaporator 4. Next, the defrosting heater 6 is energized,
Defrosting begins. Due to the heat generated by the defrosting heater 6, the heat is reflected in the direction of the evaporator 4 by the reflection plate 11, and the frost accumulated on the surface of the evaporator 40 melts, becomes water, accumulates in the drain pan 3, and is further drained via the drain pan pipe 9. be done. The end of defrosting is usually detected temperature-wise by a defrosting end detection thermostat (not shown) provided in the evaporator 4 or the like. When defrosting is completed, the cooling operation described above is restarted, and cooling and defrosting are repeated at a constant cycle set by the defrosting timer.

Problems to be Solved by the Invention However, with the above configuration, since no heat is trapped inside the cooling unit during defrosting, the defrosting time becomes longer and heat escapes into the refrigerator, raising the temperature inside the refrigerator. There was an issue to do.

In view of the above problems, the present invention provides a cooling unit that promotes defrosting and efficiently performs cooling and defrosting.

Means for Solving the Problems In order to solve the problems, the cooling unit of the present invention forms a box body with a fan panel, a side panel, and a drain pan.
An evaporator and a defrosting heater having a movable reflector are provided inside the box, and a fan motor is provided outside the box.

Effects of the present invention With the above-described configuration, during defrosting, since the reflective plate closes, the heat for defrosting is trapped in the cooling unit, and the heat is transmitted to each part of the evaporator in a short time.
Defrosting is complete. At the same time, since heat does not escape into the refrigerator, the temperature rise inside the refrigerator during defrosting can be kept to a minimum.

EXAMPLE A cooling unit according to an example of the present invention will be described below with reference to FIGS. 1, 2, and 3. FIG. 1 is a perspective view of a cooling unit according to the present invention, FIG. 2 is a longitudinal cross-sectional view of the cooling unit, and FIG. 3 is a cross-sectional view of the cooling unit.

In FIG. 1, FIG. 2, and FIG. 3, the same components as those of the conventional example are given the same reference numerals, and detailed explanation thereof will be omitted. A movable reflecting plate 21 has a curved surface and is attached to rotate around the defrosting heater 15. The movable reflector 21 is designed to open when the fan motor 7 starts operating, and to close when the fan motor stops. During cooling, the movable reflecting plate 21 opens due to wind pressure to form a suction port through which air passes into the evaporator 4.

During defrosting, the supply of refrigerant to the piping 4a of the evaporator 4 is cut off, and at the same time, the rotation of the fan motor is stopped so that the refrigerant no longer passes through the evaporator 4, and the movable reflector 21 is closed. At the same time, the defrosting heater 16 is energized and defrosting begins. The heat of the defrosting heater 16 is transmitted to the evaporator 4 as side radiation heat by the action of the movable reflector 21. Also, since the movable reflector 21 is closed at this time, the heat from the defrosting heater 16 is trapped inside the cooling unit, so the evaporator 4
It is transmitted to every part of the body.

Moreover, the curved shape of the movable reflector 21 allows the secondary radiation heat to be transmitted evenly to each part. Furthermore, since the movable reflector 21 is closed, the amount of heat leaking out of the cooling unit is extremely small, and the rise in internal temperature during defrosting can be suppressed to a very low limit.

As a result of the above, complete defrosting is possible in a short period of time, and efficient cooling and defrosting can be achieved.

Effects of the Invention As described above, the present invention makes the reflector of the cooling unit movable and forms a curved surface, so that the reflector becomes the main ventilation opening during cooling, and closes during defrosting, allowing the cooling unit to move. Defrosting can be carried out efficiently by trapping heat inside the box and using side radiation heat, and since heat does not escape into the box, the temperature rise inside the box during defrosting can be kept to a minimum.

[Brief explanation of drawings]

FIG. 1 is a perspective view of a cooling unit in an embodiment of the present invention, FIG. 2 is a longitudinal cross-sectional view of a cooling unit in an embodiment of the present invention, and FIG. 3 is a cross-sectional view of a cooling unit in an embodiment of the present invention. Figure 4 is a perspective view of the conventional cooling
The figure is a longitudinal cross-sectional view of a conventional cooling unit, and FIG. 6 is a cross-sectional view of the conventional cooling unit. 1... Fan panel, 2... Side panel, 3... Drain pan, 4... Evaporator, 16. River... Defrosting heater, 7. River ...Fan motor, 21.Old...Movable reflector.

Claims (1)

[Claims] A cooling unit comprising a box formed by a fan panel, a side panel, and a drain pan, an evaporator and a defrosting heater having a movable reflector inside the box, and a fan motor outside the box.