JPS60181570A - Cooling device for freezing refrigerator, etc. - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a cooling device such as a forced draft refrigerator/freezer, and particularly to one using a surface heater as a defrosting heater.

Structure of the conventional example and its problems Fig. 1 shows a cross-section of the main parts of a conventional refrigerator-freezer, and Fig. 2 shows a diagonal perspective view of the evaporator. Specifically, -1 is the refrigerator-freezer main body, 2 is the freezer compartment, 3 is the refrigerator compartment, and 4 is the partition wall that partitions the freezer compartment 2 and the refrigerator compartment 3.

In the ventilation passage δ in the partition wall 4, there is a fin-tube type evaporator 6 that forms part of the refrigeration system, a blower 7 for forcing cold air, and heat insulation provided at the top and bottom of the evaporator 6. There is material 8.8'. The evaporator 6 consists of a large number of small fins 9, large fins 9', a refrigerant pipe 10, an end plate 11, and a defrosting pipe heater 12, and the small fins 9 and large fins 9' are arranged alternately. In addition, since the ends of the fins 9 and 9' are aligned on the ventilation and leeward side, the fin pitch on the ventilation and windward side is larger than the fin pitch on the leeward side.

Next, the flow of wind will be explained. By the blower 7,
The air in the freezer compartment 2 passes through the freezer compartment side suction port 13, and the air in the refrigerator compartment 3 passes through the refrigerator compartment side suction port 14.
The air from 3 is mixed and sucked through an evaporator 6, and behind the blower 7, it passes through a discharge duct 16 and is returned to the freezer compartment 2 and the refrigerator compartment 3, respectively.

Next, the flow of air when the evaporator 6 is frosted will be explained. The frost on the evaporator 6 gradually advances from the upwind side of the ventilation air to the leeward side, but the air from the freezer compartment 2 and the air from the refrigerator compartment 3 are transferred to the upwind side of the evaporator 6. Road 6
As the ice mixes within the air and flows into the evaporator 6, frost begins to form over the entire upwind side of the evaporator 60. Then, as the amount of frost gradually increases, the thickness of the frost layer increases, the ventilation resistance increases, and the ventilation volume decreases, eventually covering the fins 9° and 9', causing clogging due to frost formation and causing almost no ventilation. It will no longer be done. At this time, the frosting load on the evaporator 6 is due to the fact that the refrigerator compartment 3 has a larger internal volume than the freezer compartment 2, the temperature inside the refrigerator is high, and the temperature difference between it and the evaporator 6 is large. The air from room 3 is quite large.

However, as mentioned above, since the air from the freezer compartment 2 and the air from the refrigerator compartment 3 mix on the upstream side of the evaporator 6, frosting progresses uniformly in the evaporator 6. This has the disadvantage that the amount of ventilation is reduced and the cooling capacity is reduced.

Also, to explain defrosting, pipe heaters 12 each having a 2-in. Heater slots (9, 9', and heater slots provided in the end plate 11 from the outside) 16, 16'
, 17, and when defrosting, the pipe heater 12 is energized and the fins 9.9
', the refrigerant pipe 1o is heated and defrosted. For this reason,
In order to arrange the pipe heater 12 in the evaporator 6, the pipe heater 12 is bent in a meandering manner in advance, and then the heater slots 16, 16 are inserted one by one.
', 17, which is troublesome and requires many steps.

Purpose of the Invention Therefore, the present invention separates the air between the refrigerator compartment and the freezing compartment in the ventilation path on the upper side of the evaporator ventilation, and separates the frost formation load, thereby extending the time for clogging due to frost formation and achieving long-term cooling. Structure of the Invention In order to achieve this object, the present invention has a fin tube type first evaporator, a second evaporator, and a fin tube type first evaporator, a second evaporator, and In an evaporator comprising a plane heater interposed between both evaporators, the plane heater is provided at a position that separates the ventilation suction air path of the evaporator into a first evaporator side and a second evaporator side, and Evaporator fin pitch is 1st
By making it larger than the evaporator, it reduces the labor and process required to install the heater, and by separating the frosting load, it is possible to extend the time for clogging due to frosting and maintain cooling capacity for a long time. This is what I did.

Description of examples An embodiment of the present invention will be described below with reference to the accompanying drawings.

In Figures 3 and 4, 21 is the refrigerator-freezer body, 22
is the freezer compartment, 23 is the refrigerator compartment, and 24 is the freezer compartment 22 and refrigerator compartment 2.
This is a partition wall that partitions 3 and 3.

In the ventilation passage 25 in the partition wall 24, there is an evaporator 26 that forms part of the refrigeration system, and a blower 2 that forces cold air through the air.
7 and a heat insulating material 28 provided at the upper and lower parts of the evaporator 26
．． 28'. The evaporator 26 is a first evaporator 29
and a second evaporator 3o, and both evaporators 29. s6'! It consists of a defrosting surface heater 31 interposed in between for heat exchange, and
The surface heater 31 connects the suction side ventilation path of the evaporator 26 to the first
Freezer compartment side suction ventilation passage 33 on the evaporator 29 side and the second evaporator 3
It is located separately from the refrigerator compartment side suction ventilation passage 34 on the zero side. The first evaporator 29 and the second evaporator are each composed of fins 35' and 36, a refrigerant pipe 37, and an end plate 32, 32', and the fin pitch is the second evaporator 3o. is larger than that of the first evaporator 29.

Next, the flow of wind will be explained. By means of the blower 27, the air in the freezer compartment 22 passes through the freezer compartment side suction port 38, the freezer compartment side suction ventilation passage 33 partitioned by the surface heater 31, and the first evaporator 29 (9), and the refrigerator compartment side suction port 38. The air in the refrigerator 23 passes through the refrigerator compartment side suction port 39, is energized to the refrigerator compartment side suction ventilation passage 34 partitioned by the surface heater 31, and the second evaporator 30, is merged with each other, and is sucked, and at the rear of the blower 27 is discharged into a discharge duct) 4
0 and are returned to the freezer compartment 22 and refrigerator compartment 23, respectively.

Next, we will explain the flow of wind when frost has progressed. The frosting on the evaporator 26 gradually progresses from the upwind side to the leeward side of the suction side of the ventilation air, but the air from the freezer compartment 22 and the air from the refrigerator compartment 23 are heated by the surface heater. 31, the frosting progresses differently in each case.

The internal volume of the refrigerator compartment 23 side is larger than that of the freezer compartment 23 side, and the temperature difference between the internal temperature of the refrigerator compartment 23 and the evaporator 26 is also larger than that of the freezer compartment 22. A large amount of frost builds up.

However, the fin pitch of the second evaporator 3o is
Since it is larger than 9, clogging due to frost is less likely to occur. For this reason, clogging due to frost formation may occur.
There is little reduction in ventilation volume or cooling capacity, and cooling capacity can be maintained for a long time. In addition, as the frosting progresses further, the second evaporator 3o becomes clogged due to frosting, and the refrigerator compartment side suction ventilation passage 34 is almost closed, the amount of ventilation is drastically reduced, and the refrigerator compartment 23 is no longer cooled. Also, since the frosting load amount of the first evaporator 29 is smaller than that of the second evaporator 29, clogging due to frosting does not occur, and the freezer compartment side suction air passage 33 and the first evaporator 29
The amount of ventilation in the refrigerator does not decrease by l''L, and the cooling capacity on the freezer compartment 22 side can still be maintained.

In addition, since the surface heater 31 is adopted as the defrosting heater, it is possible to greatly reduce the serpentine bending process, installation effort, and process required for conventional pipe heaters.

Therefore, it is possible to extend the time of clogging due to frost formation and maintain cooling capacity for a long time, and even when the second evaporator 30 on the refrigerator compartment side cannot maintain cooling capacity due to clogging due to frost formation. In addition, the freezer compartment side can maintain sufficient cooling capacity, and the time and effort required to install the defrosting heater can also be reduced.

Effects of the Invention As is clear from the above description, the present invention includes a fin-tube type first evaporator, a second evaporator, and a surface heater interposed between both evaporators, and the surface heater is connected to the evaporator. The ventilation suction air passage is provided in a position that separates the first evaporator side and the second evaporator side, and the fin pitch of the second evaporator is larger than that of the first evaporator, so it is suitable for defrosting. By reducing the time and process required to install the heater and separating the frosting load, the time required for clogging due to frosting is extended and cooling capacity is maintained for a long period of time. Even when the cooling capacity cannot be maintained in the first evaporator, the cooling capacity can still be maintained in the first evaporator.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a main part of a conventional refrigerator-freezer, FIG. 2 is a perspective view of its evaporator, and FIG. 3 is a sectional view of a main part of a refrigerator-freezer equipped with a cooling device according to an embodiment of the present invention. FIG. 4 is a perspective view of the evaporator. 26...Evaporator, 29...A first evaporator, 3
0...τ...Second evaporator, 31...Surface heater. Name of agent: Patent attorney Toshio Nakao 1 person”7
. /- 2nd prisoner 2

Claims (1)

[Claims] An evaporator consisting of a fin-tube type first evaporator, a second evaporator, and a surface heater interposed between both evaporators are disposed in parallel in an air passage communicating with the freezer compartment and the refrigerator compartment, and The surface heater is provided at a position that separates the ventilation suction air path of the evaporator into the first evaporator side on the freezing compartment side and the second evaporator side on the refrigerator compartment side, and the fin pitch of the second evaporator is set to the first evaporator side on the refrigerator compartment side. A cooling device such as a refrigerator-freezer that is larger than an evaporator.