JPH087316Y2 - Freezers - Google Patents

Description

[Detailed description of the device]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerating and refrigerating apparatus capable of preventing damage to a fan in a refrigerator due to a frost lump detached from an evaporator during a defrost operation.

[0002]

2. Description of the Related Art A typical prior art of a refrigerator inside unit in a refrigerating and refrigerating apparatus is disclosed in Japanese Utility Model Laid-Open No. 64-19885, and FIG. When frost is formed on the evaporator 4 during the freezing operation, the defrosting operation is performed after the freezing operation is stopped by detecting the frost on the evaporator 4 by an appropriate means or by a command periodically issued. This defrost normally cools the refrigeration cycle hot gas to the evaporator 4
And the internal fan 7 is stopped.

[0003]

In such a prior art, when the frost is unnecessarily excessive, and when the outside air temperature is considerably higher than the inside temperature and the hot gas temperature is high. In such a case, the cross fin of the evaporator 4 is rapidly heated, so that the contact portion with the cross fin is melted before the temperature of the surface of the attached frost mass is raised. Therefore, peeling may occur without melting the entire frost mass, and the separated frost mass 28 may be caught by the blade portion of the in-compartment fan 7 that is stopped and may be in a locked state. When the fan locks, there is a problem that when the freezing operation is started after the defrosting ends, an overcurrent flows in the fan motor, which causes coil burnout.

The object of the present invention is to protect the separated frost lumps from being caught on the inside fan, and
By melting the separated frost mass and guiding it to the drain pan below, the damage to the internal fan is prevented and the reliability against defrost is increased.

[0005]

DISCLOSURE OF THE INVENTION The present invention relates to a refrigerating machine including a compressor 1, a condenser 2, an expansion mechanism 3 and an evaporator 4 to which an internal fan 7 is attached. 7, a porous reticulated body 23 is provided, and heating means 11 for heating during defrosting operation is provided along the porous reticulated body 23.

The present invention is also characterized in that the heating means 11 is formed by a conduit for guiding the refrigerant discharged from the compressor 1 during the defrost operation.

[0007]

According to the present invention, since the porous reticulated body 23 is provided between the evaporator 4 and the internal fan 7, the frosted mass separated from the evaporator 4 during the defrost operation is blocked by the reticulated body 23. The falling into the internal fan 7 is prevented. Even if a frost lump falls on the porous mesh body 23, the heating means 11
In order to melt the frost, the frost is collected in a drain pan or the like below, and the frost mass does not adversely affect the blowing ability of the internal fan 7.

Therefore, the internal fan 7 is prevented from being locked, and the reliability of the defrost operation can be improved.

Further, in a preferred embodiment of the present invention, the refrigerant discharged from the compressor is introduced into the heating means 11 during the defrost operation. This enables efficient heating.

[0010]

1 is a refrigeration circuit diagram of a refrigerating / refrigerating apparatus according to an embodiment of the present invention. A compressor 1, a condenser 2 provided with an external fan 6, a dryer filter 8, a heat exchanger 9, a capillary tube as an expansion mechanism 3, an evaporator 4 provided with an internal fan 7, and an accumulator 5. , Such devices as the discharge gas pipe 13, the liquid pipes 14, 15, 1
6, 17, 18, gas pipes 19, 20, and a suction gas pipe 21 are connected in a circulating manner to form a refrigeration cycle.

In the condenser 2, the intermediate portion of the heat exchange coil is connected to the high-pressure dome in the closed casing of the compressor 1 by the liquid pipes 14 and 15, and the high-pressure refrigerant formed by partial condensation is in the closed casing of the compressor 1. After exchanging heat with the low pressure side, the second half of the condenser 2 again exchanges heat with the outside air for condensation heat. On the other hand, in the heat exchanger 9, heat is exchanged between the high-pressure liquid refrigerant flowing in the liquid pipe 17 and the low-pressure gas refrigerant flowing in the gas pipe 20, whereby the refrigerant inflow side of the capillary tube 3 is reliably liquid-cooled. It is designed to be sealed.

In the refrigerating / refrigerating apparatus having the above-mentioned refrigerating cycle, the solenoid valve 12 is provided so as to extend over the middle part of the discharge gas pipe 13 and the middle part of the liquid pipe 18 connected to the outlet side of the capillary tube 3. And a hot gas bypass pipe 22 including a heating means 11 realized by a fan guard heater pipe and a drain pan heater 10 in series.

In the hot gas bypass pipe 22, the solenoid valve 12 is closed during normal refrigerating operation to cut off the flow of the refrigerant. On the other hand, when performing the defrost operation, the solenoid valve 12 is opened and the hot gas refrigerant at high temperature
It is sent to the evaporator 4 via the fan guard heater pipe 11 and the drain pan heater 10 in this order, and defrosted by the heat of the refrigerant in the refrigeration cycle.

In FIG. 1, one frame A surrounded by a chain double-dashed line is an outside unit and the other frame B is an inside unit. Reference numeral 25 in the outside-compartment unit A indicates a high-pressure pressure switch (abbreviation “HPS”) for overload protection, and reference numeral 24 in the inside-compartment unit B indicates a drain pan.

FIG. 2 is a vertical sectional view showing the structure of the internal unit B. The internal unit B has an evaporator 4 inside the casing.
And an internal fan 7 are arranged in parallel, a drain pan 24 is provided below the evaporator 4, and a fan cover 26 is provided around the internal fan 7. In the example shown in FIG. 2, the internal fan 7 is provided in a push-in type, and the fan portion is arranged so as to be close to the evaporator 4 and the motor portion is located far away, so that the waterproofness of the motor portion can be improved. I am taking it.

A porous net 23 is provided between the evaporator 4 and the internal fan 7. Porous mesh 23
Has a small resistance to the flow of wind such as expanded metal, is formed into a net-like body having a large number of holes that do not allow frost lumps to pass through, and a wire net made of iron as a material with a waterproof coating on the surface, Further, a wire mesh made of brass or stainless steel is used.

A fan guard heater 11 is provided along the side of the evaporator 4 with respect to the porous net 23. The fan guard heater 11 is formed by bending a thin copper pipe in a zigzag zigzag shape in one plane when facing the evaporator 4 of the porous reticulate body 23 in the case of a pipeline through which the refrigerant flows. It is attached to the surface on the side to be attached and fixed to the porous net-like body 23 by means such as brazing with brass brazing to be integrated.

FIG. 3 is a perspective view showing an assembled state of the fan guard heater 11 as a heating means and the porous mesh 23.
4 to 5 are front views, plan views, and
FIG. The fan guard heater 11 is bent in a meandering shape with respect to the rectangular porous net body 23.
However, the fan guard heater is formed so that the porous mesh 23 and the fan guard heater 11 are integrated with each other by providing the brazing joint portions 27 (see FIG. 6) at appropriate intervals so that they are evenly diffused over the entire surface. To be done.

During the defrost operation, the compressor 1 is operated, the internal fan 7 is stopped, and the solenoid valve 12 is opened to perform hot gas bypass type defrost. Evaporator 4
The frost adhering to the frost melts due to the heating action of the hot gas flowing through the evaporator coil, and the frost mass and the drain drop into the drain pan 24 below. Even if some of the frost blocks fall on the fan guard and are caught as they are, they are melted by the heating action of the fan guard heater 11, and therefore fall apart from the fan guard into the drain pan 24. By providing this fan guard, it is possible to prevent frost lumps from being caught on the internal fan 7.

In contrast to the embodiment described above, the heating means 11 is provided between the evaporator 4 and the porous mesh 23,
It may be provided between the porous mesh body 23 and the internal fan 7. On the other hand, the heating means 11 may use a pipeline through which hot gas flows when performing defrosting by a reverse refrigeration cycle, or may use an electric heater instead of the refrigerant heater. It goes without saying that modifications are included in the scope of the present invention. If hot gas bypass is performed as in the present embodiment, the influence of the outside air temperature is small and there is no need for electrical insulation, so that efficient heating can be performed.

[0021]

As described above, according to the present invention, the evaporator 4
Since the porous net 23 is provided between the internal fan 7 and the internal fan 7, the heating means 11 for heating during the defrost operation is provided along the porous net 23, so that the frost lumps are separated during the defrost operation. It is eliminated that the fan 7 falls and is caught by the internal fan 7, and the fan lock is reliably prevented.

Further, even if a frost lump is placed on the porous net-like body 23, it can be surely melted by the heating means, so that all the separated frost can be introduced into the drain pan.
This has the effect of improving the reliability of defrost operation.

Further, according to the embodiment in which the refrigerant discharged from the compressor 1 is guided to the heating means 11, the frost lump can be efficiently melted.

[Brief description of drawings]

FIG. 1 is a refrigeration circuit diagram of a refrigeration system according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of an internal unit of the freezer-refrigerating apparatus shown in FIG.

FIG. 3 shows the heating means 11 and the porous reticulate body 2 shown in FIG.
3 is a perspective view showing an assembled state with FIG.

FIG. 4 is a front view corresponding to FIG.

FIG. 5 is a plan view corresponding to FIG.

FIG. 6 is a sectional view showing a main part corresponding to FIG.

FIG. 7 is a vertical cross-sectional view showing the structure of a main part of a conventional refrigerating / refrigerating apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor 2 Condenser 3 Expansion mechanism 4 Evaporator 7 Internal fan 11 Heating means 23 Porous reticulated body

Claims (2)

[Scope of utility model registration request] 1. A refrigerating and refrigerating apparatus including a compressor 1, a condenser 2, an expansion mechanism 3, and an evaporator 4 to which an internal fan 7 is attached, wherein a porous net-like structure is provided between the evaporator 4 and the internal fan 7. Body 2
3, heating means 11 for heating during defrost operation
Is provided along the porous reticulate body 23. 2. The refrigerating / refrigerating apparatus according to claim 1, wherein the heating means 11 is formed by a pipe line for guiding the refrigerant discharged from the compressor 1 during the defrost operation.