JP3482405B2 - refrigerator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for defrosting an evaporator.
A refrigerator having defrosting means performed by a heater.
You. [0002] 2. Description of the Related Art In recent years, refrigeration and cooling having an evaporator
Regarding storage, see JP-A-8-54172.
Information. [0003] Hereinafter, the conventional refrigeration will be described with reference to the drawings.
Explain the refrigerator. FIG. 31 is a longitudinal section of a main part of a conventional refrigerator-freezer.
FIG. In FIG. 31, 1 is a refrigerator-freezer body, 2
Is a freezing room inside the refrigerator-freezer body 1, and 3 is a freezing refrigerator.
Refrigerator room inside refrigerator main unit 1, 4 is freezer compartment door, 5 is refrigeration
Room door, 6 is a partition wall that separates the freezing room 2 and the refrigerator room 3, and 7 is a cold room.
A freezing compartment suction port for sucking air in the freezing compartment 2, 8 is a refrigerator compartment 3.
Refrigeration chamber suction port for sucking air inside, outlet 9 for discharging cool air
Outlet, 10 is an evaporator, 11 is a fan for circulating cool air
is there. [0005] Reference numeral 12 denotes an evaporator for separating the evaporator 10 and the freezer compartment 2
Instrument partition wall, 13 is a tub, 14 is a drain port, 15 is a nichrome wire
In a coil shape and covered with a glass tube
Defrost water drops directly on the defrost tube heater 15
To prevent the evaporative noise generated when touching
The root 17 is installed between the tub 13 and the defrosting tube heater 15.
It is a metal bottom plate that is insulated and held. Next, the operation will be described. Freezer 2 or cold
When the storage chamber 3 is cooled, the refrigerant flows through the evaporator 10
The evaporator 10 is cooled. Fan 11 in the same way
, The cooling air from the freezing room suction port 7 or the refrigerator compartment suction port 8
The heated air in the freezing room 2 and the refrigerator room 3 is sent to the cooling room 20 and evaporated.
Is cooled by exchanging heat with the heater 10 and the cooling air is cooled from the discharge port 9.
It is sent into the freezing chamber 2 and a communication port (not shown) is
Pass cold air through the refrigerator compartment. Here, the air that exchanges heat with the evaporator 10 is:
Inflow of high-temperature outside air by opening and closing the freezer compartment door 4 and the refrigerator compartment door 5
Or the evaporation of water from the stored food in the freezer 2 and the refrigerator 3
Because it is humidified air, its temperature is lower than that of air.
Moisture in the air becomes frost and forms frost on the evaporator 10 which is
As the amount of frost increases, heat exchanges with the surface of the evaporator 10
The heat transfer with air is impeded and the air flow resistance
The heat transfer rate is reduced due to a decrease in cooling, resulting in insufficient cooling
You. [0008] Therefore, before the cooling becomes insufficient, the defrosting tube is removed.
The Nichrome wire of the motor 15 is energized. Energize the nichrome wire
Is started, from the nichrome wire to the evaporator 10 and peripheral parts
Heat rays are emitted. At this time, the heat radiated to the bottom plate 17
The wire is partially reflected from the shape of the bottom plate 17 to the heater wire,
Others are reflected towards the evaporator 10 and other peripheral components.
It is. Thus, the evaporator 10, the tub 13, the drain 1
The frost that has arrived near 4 is melted in water. Also, like this
Part of the defrosted water that has melted falls directly into the tub 13,
The roof 16 avoids the defrosting tube heater 15 and the tub 13
And is drained out of the refrigerator through the drain port 14. [0010] SUMMARY OF THE INVENTION
In the conventional configuration, generally, the micro-
The glass surface temperature is extremely high, not to mention the wire surface
The bottom plate 17 is located near the tube heater 15.
And a part of the heat ray radiated from the tube heater 15
From the tube heater 15
The temperature rises abnormally and exceeds the ignition temperature of the flammable refrigerant.
You. This indicates that if flammable refrigerants are used as refrigerants,
Where the flammable refrigerant communicates with the evaporator 10 and the interior of the refrigerator.
Leaks from the piping installed in the
There is a danger of ignition and explosion when the power is supplied to the
There was a problem that. In view of the above problems, the present invention eliminates the use of flammable refrigerant.
Defrosting was performed in an environment that leaked into the installation atmosphere of the frost means
Even in the case, the danger due to the ignition of the flammable refrigerant
It is an object of the present invention to provide a freezer-freezer. [0012] [MEANS FOR SOLVING THE PROBLEMS] To achieve the above object
The refrigerator of the present inventionThere is no air convection between the freezer compartment and the refrigerator compartment.
Refrigerator body, compressor and condenser
Refrigerator, refrigerator with high evaporation temperature for refrigerator, high evaporation
Decompression mechanism for high evaporation temperature, low pressure reduction for temperature, for refrigeration
Freezer cooler with low evaporation temperature, decompression for low evaporation temperature
Pressure reducing mechanism for low evaporation temperature, large pressure reduction for high evaporation temperature
After passing through the mechanism, it flows to the refrigerator cooler and is sucked into the compressor.
Cooling cycle for cold room and reduction for low evaporation temperature
Through the pressure mechanism to the freezer compartment cooler and to the compressor.
Switching to switch between the suctioned refrigerator cooling cycle
A refrigeration system in which flammable refrigerant is sealed
Stem, the air that has exchanged heat with the refrigerator cooler
A refrigerating room fan circulating in the refrigerating room;
Cooling that circulates air exchanged with a cooler into the freezer compartment.
A freezer compartment fan and the freezer compartment cooler
Defrosting by lowering the heat generation temperature below the ignition temperature of the flammable refrigerant
Means, when the compressor is stopped or when the refrigerator compartment
Defrosting the freezer compartment cooler by the defrosting means during cooling
During the stoppage of the compressor, air with a temperature exceeding 0 ° C.
Operate the refrigerating room fan during the time when it can be sublimated by wind
And the refrigerator coolerDefrosting is performed. [0013] From this, the cooling using the flammable refrigerant
In the freezing cycle, the flammable refrigerant defrosts the freezer cooler.
If defrosting is performed in an environment that has leaked into the installation atmosphere of the means
Can reduce the risk of ignition of flammable refrigerants
You.In addition, while the compressor is stopped, the refrigerator
The frost on the refrigerator compartment cooler is caused by the air exceeding 0 ° C in the storage room.
Sublimation can be defrosted. [0014] DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention
IsThe freezer compartment and the refrigerator compartment are independent so that there is no air convection.
Refrigerator body with compressor, condenser, and refrigerator
Refrigerator cooler for evaporation temperature, reduced pressure for high evaporation temperature
Decompression mechanism for small high evaporation temperature, low evaporation temperature for refrigeration
Freezer compartment cooler, low evaporation with low decompression for low evaporation temperature
Through the pressure reducing mechanism for temperature and the pressure reducing mechanism for high evaporation temperature,
Refrigeration flowing to the refrigerator cooler and sucked into the compressor
Before passing through the cooling cycle for the chamber and the pressure reducing mechanism for the low evaporation temperature
The chill that flows to the freezer compartment cooler and is sucked into the compressor
Switching valve to switch between freezing room cooling cycle and
A refrigeration system connected to the flammable refrigerant,
Circulates air exchanged with the refrigerator cooler into the refrigerator compartment
Heat exchange between the refrigerator compartment fan and the freezer compartment cooler
Freezer fan for circulating the cooled air into the freezer
Generating the combustible refrigerant for defrosting the freezer compartment cooler.
Defrosting means for lowering the heat generation temperature below the fire temperature
During the stop of the compressor or the cooling of the refrigerator compartment.
The defrosting means defrosts the freezer compartment cooler.
During the stoppage of the compressor, air with a temperature exceeding 0 ° C
While the sublimation room can be sublimated, the refrigerator fan is operated to
Storage room coolerPerforms defrosting, so conventional freezer and refrigeration
While all the rooms including the room are cooled by one cooler,
Since the room cooler only cools the freezer compartment,
The amount of frost on the recirculator is reduced, and it is removed in the same defrost time as before.
If the frost is over, a low heat value defrosting hand with low defrosting capacity
Steps can be used. [0015] From this, the use of the low heat generation defrosting means
Low temperature and low power consumption.
The defrosting means of the heat exchanger performs defrosting below the ignition temperature of the flammable refrigerant.
And energy saving. Also,While the compressor is stopped, the refrigerator compartment fan
Operation, the air exceeding 0 ° C in the refrigerator compartment is refrigerated.
The frost that has passed through the room cooler and formed frost on the refrigerator cooler
Defrosted by sublimation. Hereinafter, an embodiment of the present invention will be described with reference to FIG.
This will be described with reference to FIG. The same configuration as the conventional
In this regard, the same reference numerals are given and the detailed description is omitted. (Embodiment 1) Embodiment according to the present invention
1 will be described with reference to the drawings. FIG. 1 shows a refrigerator according to the first embodiment of the present invention.
It is a refrigeration system diagram of a refrigerator. As shown in FIG. 1, 18 is attached to the evaporator 10.
19 is a defrosting means for defrosting the frost deposited, and 19 is a compressor, 2
0 is a condenser, 21 is a decompression mechanism, and condenses with the compressor 19
The device 20, the pressure reducing mechanism 21, and the evaporator 10 are functionally connected in a ring.
A flammable refrigerant (not shown) is installed inside the connected refrigeration cycle.
Is enclosed. The refrigerator-freezer constructed as described above is
The operation will be described below. By operating the compressor 19, the steam of the refrigeration cycle is
The generator 10 is cooled and operates simultaneously with the operation of the compressor 19.
Fan 11 cools the air inside the refrigerator
The cool air that has passed through the evaporator 10 and exchanged heat with the evaporator 10
Discharged into the refrigerator. And, at the time of arbitrary operation of the compressor 19,
After a lapse of time, the defrosting means 18 is operated. By the operation of the defrosting means 18, the defrosting means
18 is the ignition of the flammable refrigerant used in the refrigeration cycle
Heat is generated at a temperature lower than the temperature to defrost the evaporator 10,
Detecting completion of defrosting by detecting means (not shown)
Stop the frost means and periodically prevent uncooling inside the refrigerator due to frost formation.
Stop. From the above, it should be noted that in the refrigeration cycle
If flammable refrigerant leaks into the refrigerator, it will not be removed even if defrosting is performed.
The frost means 18 is a flammable refrigerant used in a refrigeration cycle.
Danger of ignition because it can only be below the ignition temperature of
Decrease. (Embodiment 2) Embodiment 2 of the present invention
Will be described with reference to the drawings. The implementation
About the same composition as mode 1, the same numerals are attached and detailed
Description is omitted. FIG. 2 shows refrigeration according to Embodiment 2 of the present invention.
It is a longitudinal section of an important section of a warehouse. As shown in FIG. 2, reference numeral 22 denotes the defrosting means 18.
A glass tube 23 is a constituent element of the defrosting means 18.
Consisting of a metal resistor inside the glass tube 22
Is the heater wire, 24 a straight line at both ends of the heater wire 23?
The straight line portion 25 is a heater wire other than the straight line portion 24.
23 can be stored in a predetermined length of the glass tube 22
Spiral part in the shape of a spiral.
A cap for preventing the inside of the lath tube 20 from entering.
You. The refrigerator-freezer constructed as described above is described.
The operation will be described below. When the defrosting means 18 operates, the heater wire 2
3 is a heater wire 2 which is adjacent to the straight portion 24 in comparison with the heater wire 2.
Spiral part 2 whose temperature rises due to the influence of 3
5 generates heat at a temperature lower than the ignition temperature of the flammable refrigerant
As a result, the frost of the evaporator 10 melts into water, and the evaporator 10
From the drop. Some of the dropped water is a glass tube 22.
From the roof 16 or cap 26 without dripping directly
3 falls, others drop directly into tub 13 and tub 1
The water dropped on 3 is drained to the outside from a drain port 14. From this, it can be seen that the heater wire 2 as a heating element
Most of the heat rays due to the radiation from 3 pass through the glass tube 22
Frost adhering to the evaporator 10 and surrounding parts
From the heater wire while maintaining the same or better defrosting capacity as before
23 is lower than the ignition temperature of the flammable refrigerant,
Further, the heater wire 23 is directly connected to the defrost water by the cap 26.
Corrosion deterioration due to contact can be prevented.
Flammable refrigerant and defrost means 1
Fires even if defrosting is performed when it leaks into the atmosphere of 8
Danger can be extremely low. (Embodiment 3) Embodiment of the present invention
3 will be described with reference to the drawings. The implementation
The same components as those in the second embodiment are denoted by the same reference numerals and are described in detail.
Detailed description is omitted. FIG. 3 is a main part according to a third embodiment of the present invention.
FIG. As shown in FIG. 3, reference numeral 27 denotes a heater wire 23.
L is a lead wire connected to both ends of the spiral portion 25.
Spiral length. The refrigerator-freezer constructed as described above is
The operation will be described below. When the defrosting means 18 operates, the lead wire 25
The heater wire 23 is input through the switch to generate heat. And
The temperature of the heater wire 23 is higher than that of the spiral portion 25.
The flammable refrigerant is ignited near the center indicated by L / 2
Heat is generated at a temperature lower than the temperature to defrost the evaporator 10. [0037] From this, the defrosting ability and the same or higher than the conventional defrosting ability
The heater wire 23 becomes hot while maintaining the life.
The surface temperature of the central part in the length direction of the spiral part 25 is flammable
Since the temperature is lower than the ignition temperature of the flammable refrigerant, the flammable refrigerant is
If it leaks into the atmosphere of the frost means 18, defrost is performed
However, the risk of ignition can be further reduced. (Embodiment 4) Embodiment according to the present invention
4 will be described with reference to the drawings. The implementation
The same components as those of the second and third embodiments are denoted by the same reference numerals.
And a detailed description is omitted. FIG. 4 is a main part of a fourth embodiment of the present invention.
FIG. As shown in FIG. 4, h is a spiral portion 25
Height. The refrigerator-freezer constructed as described above is
The operation will be described below. During defrosting, the heat generated by the heater wire 23 is
The gas near the heater wire 23 is warmed and moves upward
Gas in the glass tube 22
Becomes high temperature. Under this influence, the heater wire 23
Spiral because it has a height h in the spiral part 25
The upper part of the part 25 has a high temperature. This high temperature heater
The surface temperature of the spiral portion 25 of the wire 23 is
Heat is generated at a temperature lower than the ignition temperature to defrost the evaporator 10. From this, it can be seen that the defrosting ability and the conventional
Relatively high temperature with heater wire 23
The upper part of the spiral part 25 becomes the ignition temperature of the flammable refrigerant.
By setting the temperature to be lower than the lower limit, the flammable refrigerant is
Even if defrosting is performed in the event of leakage to the atmosphere, the risk of ignition is greater.
Ruggedness can be reduced. (Embodiment 5) Embodiment according to the present invention
5 will be described with reference to the drawings. The implementation
The same components as those in the second embodiment are denoted by the same reference numerals and are described in detail.
Detailed description is omitted. FIG. 5 is a main part according to a fifth embodiment of the present invention.
FIG. 6 is a cross-sectional view of FIG.
FIG. As shown in FIG. 5, L is a spiral portion 25
Is the length of In addition, as shown in FIG.
The heater wire 23 existing within the length L of the
The amount of heat generated in the spiral portion 25 is within the length L of the spiral portion 25.
Per unit surface area divided by the surface area of the heater wire 23
The heat value and the horizontal axis are the surface temperature of the heater wire 23. The refrigerator / freezer constructed as described above is described.
The operation will be described below. At the time of defrosting, electricity is supplied through the lead wire 27.
Heater wire 23 is Joule heat
Generates heat. At this time, the defrosting means 18 is a spiral
Of the heater wire 23 in the portion existing within the length L of the portion 25
Heat generation per unit area is 2.5W / cm^TwoLess than calorific value
Defrosts the evaporator 10. Here, the surface temperature of the heater wire 23 is high.
Heat per unit area of the spiral part 25 of the tar wire 23
As the amount increases, it increases, and the calorific value per unit area increases.
2.5W / cm^TwoAbove the ignition temperature of the flammable refrigerant
Becomes From this, it can be seen that the defrosting ability and the conventional
The heater wire 23 with flammable refrigerant
The temperature is lower than the ignition temperature, and the flammable refrigerant is
Risk of fire even if defrosting is performed
Can be reduced. Further, the total heat value of the heater wire 23 is
As the temperature increases, the surface temperature of the heater wire 23 increases,
1. Even if the total calorific value is increased, the calorific value per unit area is 2.
5W / cm^TwoBy designing to be less than
-The heater wire 23 can be used regardless of the overall heat value of the wire 23.
Since the temperature can be lower than the ignition temperature of the flammable refrigerant,
The design of the defrosting means 18 to make the temperature lower than the fire temperature can be easily made, and
While maintaining the temperature below the ignition temperature of the flammable refrigerant, the heater wire 23
Can be increased. In this embodiment, the flammable cold
This is the case when isobutane is used as the type of medium.
No difference in ignition temperature between isobutane and other flammable refrigerants
If they have the same effect. In the present embodiment, the heater
The temperature of the line 23 is lower than the ignition temperature of isobutane
However, if an isobutane refrigerant is used,
Considering the safety factor for the ignition temperature of the tongue of about 460 ° C
It is necessary to keep the heater wire 23 temperature below 360 ° C.
In this case, the calorific value per unit area is 0.67 W /
cm^TwoThe following is assumed. (Embodiment 6) Embodiment of the present invention
6 will be described with reference to the drawings. The implementation
The same components as those in the second embodiment are denoted by the same reference numerals and are described in detail.
Detailed description is omitted. FIG. 7 shows a main part of the sixth embodiment of the present invention.
FIG. 8 is a cross-sectional view of FIG.
FIG. As shown in FIG. 7, D is the spiral portion 25
Is the outer diameter of In addition, as shown in FIG.
The heater wire 23 existing within the length L of the
The amount of heat generated by the heat of the spiral portion 25 is determined by the length L and the outer diameter D of the spiral portion 25.
Calorific value per unit volume divided by volume enclosed by, vertical axis
Is the surface temperature of the heater wire 23. The refrigerator-freezer constructed as described above will be described.
The operation will be described below. At the time of defrosting, the defrosting means 18 is provided in the spiral section 25.
Of Joule heat of the heater wire 23 existing within the length L
The amount of heat was surrounded by the length L of the spiral part 25 and the outer diameter D.
Heat generation per unit volume divided by volume is 8.5 W / cm
^ThreeThe defrost of the evaporator 10 is performed at less than. Where the heater wire
23 has a surface temperature per unit volume of the spiral portion 25.
Increases as the calorific value increases, and generates heat per unit volume
8.5W / cm^ThreeAbove the ignition temperature of the flammable refrigerant
That is all. From this, it can be seen that the defrosting ability and the conventional
The heater wire 23 with flammable refrigerant
The temperature is lower than the ignition temperature, and the flammable refrigerant is
Risk of fire even if defrosting is performed
Can be reduced. Furthermore, the outer diameter D of the spiral part changes
The outer diameter D and length of the spiral portion 25
The calorific value with respect to the volume calculated from L is 8.5 W / cm^Three
The heater wire 23 is designed to be less than
Heater wire 23 can be used without affecting outer diameter D of spiral section 25
Since the temperature can be lower than the ignition temperature of the flammable refrigerant,
The design of the defrosting means 18 for lowering the fire temperature is easier.
While maintaining the temperature below the ignition temperature of the flammable refrigerant.
The outer diameter D of the nozzle part 25 and the total heat value of the heater wire 23 can be freely adjusted.
Can be changed. In the present embodiment, the flammable cold
This is the case when isobutane is used as the type of medium.
No difference in ignition temperature between isobutane and other flammable refrigerants
If they have the same effect. (Embodiment 7) Embodiment according to the present invention
7 will be described with reference to the drawings. The implementation
The same components as those in the second embodiment are denoted by the same reference numerals and are described in detail.
Detailed description is omitted. FIG. 9 shows a main part of the seventh embodiment of the present invention.
FIG. 10 is a sectional view of the temperature characteristic according to the embodiment.
FIG. As shown in FIG. 9, P is a spiral portion 25
Pitch. In addition, as shown in FIG.
Is the heater wire 2 existing within the length L of the spiral portion 25
Unit surface obtained by dividing the calorific value of Joule heat by its surface area
The calorific value per product is divided by the pitch P by the outer diameter D.
Is the calorific value divided by the coefficient of the heater line 23 on the vertical axis.
Surface temperature. The refrigerator-freezer constructed as described above will be described.
The operation will be described below. At the time of defrosting, the defrosting means 18 has a heat value Q of 9.2.
W / cm^TwoThe defrost of the evaporator 10 is performed at less than. Where
The surface temperature of the heater wire 23 increases as the calorific value Q increases.
Rise, and when the calorific value Q exceeds 9.2 W, the flammable refrigerant is ignited
It will be higher than the temperature. From this, it can be seen that the defrosting ability and the conventional
The heater wire 23 with flammable refrigerant
The temperature is lower than the ignition temperature, and the flammable refrigerant is
Risk of fire even if defrosting is performed
Can be reduced. Further, the pitch P of the spiral portion 25
And even when the diameter D changes, the heat value Q is set to 9.2.
W / cm^TwoDesigned to be less than the spiral
The heater wire 23 has no effect on the pitch and diameter of the
Can be lower than the ignition temperature of the flammable refrigerant.
Design of the defrosting means 18 lower than the ignition temperature of
Spy while maintaining the ignition temperature of the flammable refrigerant below
The pitch and diameter of the ral portion 25 and the total heat value of the heater wire 23
It can be changed freely. In this embodiment, the flammable cold
This is the case when isobutane is used as the type of medium.
No difference in ignition temperature between isobutane and other flammable refrigerants
If they have the same effect. (Embodiment 8) Embodiment according to the present invention
8 will be described with reference to the drawings. The implementation
The same components as those in the second to seventh embodiments are denoted by the same reference numerals.
And a detailed description is omitted. FIG. 11 is a block diagram of the eighth embodiment of the present invention.
It is sectional drawing of a part. As shown in FIG.
The pitch is 2 mm. The refrigerator-freezer constructed as described above is
The operation will be described below. When the defrosting means 18 is activated, the heater wire 23
When energization is started, the spiral portions 25 are adjacent to each other.
The temperature rises under the influence of the heater wire 23. This
At this time, the temperature of each part of the spiral part 25 is
The influence of adjacent lines changes due to the variation of the switch
And vary. However, the spiral section 25
Is 2 mm or more, so shadows from adjacent lines
The effect is reduced, and variations can be suppressed. From this, the pitch of the spiral portion 25
Temperature variation due to the
The entire heater wire 23 can be lower than the ignition temperature of the flammable refrigerant,
If the flammable refrigerant leaks into the atmosphere of the defrosting means 18, it is removed.
Even if frost is performed, the risk of ignition can be further reduced. In this embodiment, the pitch is 2 mm.
However, if it is more than that, the same effect can be obtained. (Embodiment 9) Embodiment 9 according to the present invention
9 will be described with reference to the drawings. The implementation
The same components as those in the second to eighth embodiments are denoted by the same reference numerals.
And a detailed description is omitted. FIG. 12 is a block diagram of the ninth embodiment of the present invention.
It is a wiring diagram of a part. As shown in FIG. 12, reference numeral 28 denotes a combustible refrigerant.
Metal that melts at a predetermined temperature below the ignition temperature, 29
is there. The refrigerator-freezer constructed as described above will be described.
The operation will be described below. At the time of defrosting, the power of the defrosting means 18 is supplied from the power supply 29.
The power supply to the power line 23 is started. And with large voltage fluctuations
For example, when a high voltage is applied,
The surface temperature may exceed the ignition temperature of the flammable refrigerant.
You. At this time, the heater wire 23 sets the ignition temperature of the flammable refrigerant.
When the temperature reaches a predetermined temperature lower than the predetermined temperature, the temperature is transmitted to the metal 28,
The power from the power supply 29 to the heater wire 23 is
Shut off, heater wire 23 loses heat and temperature drops
I do. Thus, the combustible refrigerant is supplied to the defrosting means 18
Even if defrosting is performed in case of leakage to the atmosphere of
Ruggedness can be reduced. (Embodiment 10) Embodiment of the present invention
State 10 will be described with reference to the drawings. In addition,
The same components as those in the first to ninth embodiments are denoted by the same reference numerals.
The detailed description is omitted. FIG. 13 shows a tenth embodiment of the present invention.
It is a wiring diagram of an important section. As shown in FIG. 13, reference numeral 30 denotes a combustible refrigerant.
Temperature composed of metal that melts at a predetermined temperature below the ignition temperature
Degree fuse. The refrigerator-freezer constructed as described above will be described.
The operation will be described below. When a high voltage is applied due to a large voltage fluctuation,
In this case, the surface temperature of the heater wire 23 is ignited by the flammable refrigerant.
May be above temperature. At this time, the defrosting means 18
Reaches a predetermined temperature below the ignition temperature of the flammable refrigerant.
Fuse 30 is blown and power supply 29 enters defrosting means 18.
The power is cut off, and the temperature of the defrosting means 18 does not rise. From this, the heater wire 23 is inflammable cold
The temperature rise above the ignition temperature of the medium is suppressed, and the flammable refrigerant is defrosted
Even if defrosting is performed in the event of leakage into the atmosphere of
The risk of fire can be reduced and the thermal fuse 30
Damaged by the influence of defrost, and there is no problem with the defrosting means 18
In addition, since only the thermal fuse 30 needs to be replaced,
Nonce is easy. (Embodiment 11) Embodiment of the present invention
State 11 will be described with reference to the drawings. In addition,
The same components as those in the first to ninth embodiments are denoted by the same reference numerals.
The detailed description is omitted. FIG. 14 shows an eleventh embodiment of the present invention.
It is a wiring diagram of an important section. As shown in FIG. 14, reference numeral 30 denotes a combustible refrigerant.
Temperature composed of metal that melts at a predetermined temperature below the ignition temperature
Degree fuse. The refrigerator-freezer constructed as described above is
The operation will be described below. When the defrosting means 18 operates, it comes into contact with the gas in the refrigerator.
The temperature fuse 3 is provided on the outer surface of the defrosting means 18 which is a part to be touched.
0 is closely mounted. High voltage applied due to large voltage fluctuation
If the surface temperature of the heater wire 23 is flammable
The ignition temperature of the refrigerant may be higher than the ignition temperature. At this time, the outer periphery of the defrosting means 18 is
When the temperature becomes lower than the ignition temperature of the medium,
Good heat transfer to the thermal fuse 30
The temperature also becomes a predetermined temperature below the ignition temperature of the flammable refrigerant and
Liquid and dripping. And the temperature fuse 30
The input to the defrosting means 18 is cut off at the
Is stopped. From this, the gas inside the defrosting means 18 and the
The temperature of the contacting part is more accurately transmitted to the thermal fuse 30.
The defrosting means 18 emits flammable refrigerant.
It is possible to control the temperature rise more accurately before it reaches the fire temperature.
The flammable refrigerant leaks into the atmosphere of the defrosting means 18
That the risk of fire can be reduced even if defrosting
In the case where there is no problem in the defrosting means 18, the temperature fuse 30
Maintenance is easy. (Embodiment 12) Embodiment of the present invention
State 12 will be described with reference to the drawings. In addition,
The same components as those in the first to ninth embodiments are denoted by the same reference numerals.
The detailed description is omitted. FIG. 15 shows a twelfth embodiment of the present invention.
It is a wiring diagram of an important section. As shown in FIG. 15, the thermal fuse 30
It is installed above the outer shell of the defrosting means 18. [0096] The refrigerator-freezer constructed as described above is described.
The operation will be described below. When the defrosting means 18 operates, the defrosting means 18
Gas near the outer shell is heated by heat and moves upward
Thus, the upper part of the defrosting means 18 becomes a high temperature part with respect to the lower part.
And when high voltage is applied due to large voltage fluctuation,
The surface temperature of the heater wire 23 is the ignition temperature of the flammable refrigerant.
Could be more. At this time, the height of the defrosting means 18 is high.
When the temperature reaches a predetermined temperature lower than the ignition temperature of the flammable refrigerant,
Fuse 30 blows and cuts off input to defrosting means 18
To suppress the temperature rise. From this, the temperature fuse 30 can be used as a defrosting hand.
Detects the upper temperature, which is the hottest part, in the vertical direction of step 18
The operation of the defrosting means 18 of the entire combustible refrigerant
The temperature rise above the ignition temperature can be further suppressed, and the flammable refrigerant is defrosted
Even if defrosting is performed in the event of leakage into the atmosphere of
The risk of fire can be reduced and the defrost
Easy maintenance of thermal fuse 30 when there is no problem
It is. (Embodiment 13) Embodiment of the present invention
State 13 will be described with reference to the drawings. In addition,
The same components as those in the first to ninth embodiments are denoted by the same reference numerals.
The detailed description is omitted. FIG. 16 shows a thirteenth embodiment of the present invention.
It is a wiring diagram of an important section. As shown in FIG. 16, the thermal fuse 30
It is installed at the lower part of the outer shell of the defrosting means 18. The refrigerator-freezer constructed as described above will be described.
The operation will be described below. During defrosting, the evaporator above the defrosting means 18
The frost melted from 10 etc. becomes defrost water, and a part thereof is defrost means 18.
, And others are directly dropped into the tub 13. Remove
The defrost water dropped on the frost means 18 contacts the upper part of the defrost means 18.
The temperature fuse 3 at the bottom of the defrosting means 18
It is rare to drop it to 0. Therefore, a high voltage can be applied due to a large voltage fluctuation.
The surface temperature of the heater wire 23 is flammable
When the temperature exceeds the ignition temperature of the medium, the temperature fuse 30 is defrosted.
Removal from the evaporator 10 or the like above the means 18
Since there is no temperature drop due to direct contact with frost water,
The temperature of the stage 18 can be accurately detected, and the ignition temperature of the defrosting means 18
Temperature can be suppressed more accurately, and the flammable refrigerant is defrosted
Even if defrosting is performed in the event of leakage into the atmosphere of
The risk of fire can be reduced and the defrost
Easy maintenance of thermal fuse 30 when there is no problem
Has the effect that (Embodiment 14) Embodiment of the present invention
State 14 will be described with reference to the drawings. In addition,
The same components as those in the first to thirteenth embodiments have the same reference numerals.
And the detailed description is omitted. FIG. 17 shows a fourteenth embodiment of the present invention.
It is a wiring diagram of an important section. As shown in FIG. 17, the thermal fuse 30
Installed around the center L / 2 of the length L of the defrosting means 18
Have been. The refrigerator-freezer constructed as described above is
The operation will be described below. Both ends of the defrosting means 18 are in contact with the outside air
As a result, heat exchange with the outside air takes place and the temperature is lower than the center
Therefore, the central part of the defrosting means 18 becomes a high temperature part. Soshi
Therefore, when high voltage is applied due to large voltage fluctuation,
The surface temperature of the heater wire 23 is higher than the ignition temperature of the flammable refrigerant
Could be At this time, the center of the high-temperature portion of the defrosting means 18
When the temperature reaches a predetermined temperature below the ignition temperature of the flammable refrigerant,
The temperature fuse 30 closely attached to the part
The input to the frost means 18 is cut off to suppress the temperature rise. From this, the thermal fuse 30 can be used as a defrosting hand.
The temperature of the central part, which is the hottest part, in the length direction of the step 18 is detected.
Since it operates by knowing, the flammable refrigerant
The temperature rise above the ignition temperature can be further suppressed, and the flammable refrigerant is defrosted
Even if defrosting is performed in the event of leakage into the atmosphere of
The risk of fire can be reduced and the defrost
Easy maintenance of thermal fuse 30 when there is no problem
It is. (Embodiment 15) Embodiment of the present invention
State 15 will be described with reference to the drawings. In addition,
The same components as those in Embodiments 10 to 14 are denoted by the same reference numerals.
Numbers are attached and detailed description is omitted. FIG. 18 shows a fifteenth embodiment of the present invention.
It is sectional drawing of a principal part. As shown in FIG. 18, the thermal fuse 30
100 ° C to 200 ° C depending on the ignition temperature of the flammable refrigerant used
Fusing at a temperature lowered by ° C. The refrigerator-freezer constructed as described above will be described.
The operation will be described below. When a high voltage is applied due to a large voltage fluctuation,
In this case, the surface temperature of the heater wire 23 is ignited by the flammable refrigerant.
May be above temperature. At this time, it is a heating element
The heater wire 23 is near the ignition temperature of the flammable refrigerant;
When the temperature reaches a predetermined temperature lower than the ignition temperature, the heater wire 23
Of the glass tube 22 around the heater wire 23
A predetermined temperature due to the heat taken when transferring heat to the glass tube 22
The temperature is 200 ° C lower than 100 ° C. The glass tube 22 is closely attached to the surface of the glass tube 22.
The blown thermal fuse 30 blows and enters the heater wire 23.
By shutting off the power, the temperature rise is suppressed. From this, the inside of the glass tube 22 is heated.
Defrosting means 18 having a
Means for raising the temperature of the flammable refrigerant above the ignition temperature of the entire flammable refrigerant
The flammable refrigerant is removed from the atmosphere of the defrosting means 18.
The risk of fire even if defrosting occurs
The temperature can be lowered when the defrosting means 18 has no problem.
The maintenance of the fuse 30 is easy. (Embodiment 16) Embodiment of the present invention
State 16 will be described with reference to the drawings. In addition,
The same components as those in the first to thirteenth embodiments have the same reference numerals.
And the detailed description is omitted. FIG. 19 shows a sixteenth embodiment of the present invention.
It is sectional drawing of a principal part. As shown in FIG. 19, the thermal fuse 30
Glass tube 22 on the outer periphery of linear portion 24 of heater wire 23
It is installed on the surface, and the glass tube 2 is
2 and closely fixed. The refrigerator-freezer constructed as described above is
The operation will be described below. When the defrosting means operates, the defrosting means 18
Heater wire 23 rises in temperature due to Joule heat,
Heat is transferred to the glass tube 22 on the outer periphery of the
The temperature of the tube 22 also rises in correlation with the heater wire 23
I do. At this time, the linear portion of the heater wire 23
24 is from the adjacent line like the spiral part 25
Temperature is low because the influence of
Also, the temperature of the portion on the outer periphery of the linear portion 24 is low.
You. Then, the heater wire is set to the ignition temperature of the flammable refrigerant.
When the temperature reaches below a certain degree, the outer periphery of the linear portion 24 becomes loose.
The temperature of the heat pipe 22 is a predetermined temperature lower than the temperature of the heater wire 23.
Temperature, the metal of the thermal fuse 30 melts and the heater
The power to the wire 23 is cut off, and the temperature of the heater wire 23 is low.
Down. Therefore, the defrosting means 18 is provided with the flammable refrigerant.
Can be suppressed before the ignition temperature reaches
Defrosting when the flammable refrigerant leaks into the atmosphere of the defrosting means 18
The risk of fire can be reduced even if
Maintain thermal fuse 30 if stage 18 is OK
Is easy. Furthermore, the temperature fuse 30 is connected to the heater wire 2
Detect and operate the low temperature of the part correlated with the temperature of 3
Therefore, those that are inexpensive compared to those for high temperatures can be used.
You. In this embodiment, the temperature fuse 30 is
Cap 26 also serves as holder for thermal fuse 30
Is installed in the cap 26 part for the heater wire
Table of the glass tube 22 around the portion where 23 is a straight line
Needless to say, the same effect can be obtained by installing
No. (Embodiment 17) Embodiment of the present invention
State 17 will be described with reference to the drawings. In addition,
The same components as those in the first to sixteenth embodiments have the same reference numerals.
And the detailed description is omitted. FIG. 20 shows a seventeenth embodiment of the present invention.
It is sectional drawing of a principal part. As shown in FIG. 20, 31 is a temperature detecting means.
When the temperature detecting means detects a predetermined temperature, the power supply 29
From the heater to the heater wire 23 of the defrosting means 18
You. The refrigerator-freezer constructed as described above will be described.
The operation will be described below. When the defrosting means operates, the defrosting means 18
Heater wire 23 rises in temperature due to Joule heat,
Heat is transferred to the glass tube 22 on the outer periphery of the
The temperature of the tube 22 also rises in correlation with the heater wire 23
I do. At this time, the linear portion of the heater wire 23
24 is from the adjacent line like the spiral part 25
Temperature is low because the influence of
Also, the temperature of the portion on the outer periphery of the linear portion 24 is low.
You. Then, the heater wire is used to set the ignition temperature of the combustible refrigerant.
When the temperature reaches below a certain degree, the outer periphery of the linear portion 24 becomes loose.
The temperature of the heat pipe 22 is a predetermined temperature lower than the temperature of the heater wire 23.
And the temperature detecting means 31 detects the predetermined temperature.
The power supply to the heater wire 23 is cut off,
Degree decreases. From this, the defrosting means 18 is provided with a flammable refrigerant.
Can be suppressed before the ignition temperature reaches
Defrosting when the flammable refrigerant leaks into the atmosphere of the defrosting means 18
The risk of ignition can be reduced. In addition, the temperature
The detecting means 31 is a portion correlated with the temperature of the heater wire 23.
Because it detects low temperatures, it is cheaper than high temperatures
Things can be used. In this embodiment, the temperature detecting means is a cap.
Since the pump 26 also serves as a holder for the temperature detecting means 31,
Is installed in the cap 26 part, but the heater wire 23
On the surface of the glass tube 22 around the portion where
Needless to say, the same effect can be obtained by installing. (Embodiment 18) Embodiment of the present invention
State 18 will be described with reference to the drawings. In addition,
The same components as those in the seventeenth embodiment are denoted by the same reference numerals.
And a detailed description is omitted. FIG. 20 shows an embodiment 18 of the present invention.
It is sectional drawing of a principal part. As shown in FIG. 20, 31 is a temperature detecting means.
And the temperature detecting means detects the ignition temperature of the flammable refrigerant at 310.
Detects a temperature that is 410 ° C lower than 410 ° C,
The power supply from the source 29 to the heater wire 23 of the defrosting means 18 is interrupted.
Refuse. The refrigerator-freezer constructed as described above will be described.
The operation will be described below. When the defrosting means operates, the defrosting means 18
Heater wire 23 rises in temperature due to Joule heat,
Heat is transferred to the glass tube 22 on the outer periphery of the
The temperature of the tube 22 also rises in correlation with the heater wire 23
I do. At this time, the linear portion of the heater wire 23
24 is from the adjacent line like the spiral part 25
Temperature is low because the influence of
Also, the temperature of the portion on the outer periphery of the linear portion 24 is low.
You. Then, the heater wire is used to set the ignition temperature of the flammable refrigerant.
Degree, the glass tube 22 around the straight portion 24
The temperature thereby reaches 310-410 ° C lower
You. At that time, the temperature detecting means 31 detects the temperature and
The power supply to the heater wire 23 is cut off,
The temperature drops without reaching the ignition temperature of the flammable refrigerant. Therefore, the defrosting means 18 is provided with a flammable refrigerant.
The temperature rise can be controlled exactly before the ignition temperature
The flammable refrigerant leaks into the atmosphere of the defrosting means 18
That the risk of fire can be reduced even if defrosting
In addition, the temperature detecting means 31 has a correlation with the temperature of the heater wire 23.
Because it detects low temperatures in certain parts, it is cheaper than high temperatures.
Can be used. (Embodiment 19) Embodiment of the present invention
State 19 will be described with reference to the drawings. In addition,
The same components as those in the first to eighteenth embodiments have the same reference numerals.
And the detailed description is omitted. FIG. 21 shows a nineteenth embodiment of the present invention.
It is sectional drawing of a principal part. As shown in FIG. 21, reference numeral 32 denotes a glass tube.
33 is the inner surface of the glass tube, and 33 is the glass tube of the glass tube 22.
On the outer surface, L is the length of the spiral portion 25. The refrigerator-freezer constructed as described above will be described.
The operation will be described below. At the time of defrosting, the heater is connected through the lead wire 27.
The wire 23 is energized, and the heater wire 23 is
Fever. At this time, the defrosting means 18 is
Surface area of the glass tube inner surface 32 of the portion existing within the length L
The evaporator 10 is removed when the Joule heat value per unit is less than a predetermined value.
Frost. Here, the surface temperature of the heater wire 23 is
Unit surface which is Joule heat to the surface area of the pipe inner surface 32
As the calorific value per product increases, its unit surface increases
When the calorific value per product exceeds a predetermined value, flammable refrigerant
It will be above the fire temperature. That is, the glass tube 22 is a heater wire
The area of the glass tube inner surface 32 that is suitable for the calorific value of 23
If not designed to have
The amount of heat radiated to the outside through the pipe 22 is reduced, and the defrosting ability is improved.
As the temperature drops, the temperature of the heater wire 23 rises.
U. Therefore, the surface area of the inner surface 32 of the glass tube is
Per unit area, which is the Joule heat of the heater 23
The temperature of the glass tube 22 is reduced by setting the calorific value below a predetermined value.
The heat transfer area can compensate for the decrease in heat transfer due to
While maintaining the same total amount of heat radiation from the lath tube 22,
The temperature of the glass tube 22 that is correlated with the temperature of the heater wire 23
Can be reduced. From this, it is clear that the defrosting ability and the same
The heater wire 23 with flammable refrigerant
The temperature is lower than the ignition temperature, and the flammable refrigerant is
Risk of fire even if defrosting is performed
Can be reduced. Further, the total heat value of the heater wire 23 is increased.
Then, the surface temperature of the heater wire 23 rises,
Even if the amount of heat is increased, per unit area of the inner surface 32 of the glass tube
By designing the calorific value of heat to be less than a predetermined value,
Irrespective of the overall heating value of the heater wire 23
Can be lower than the ignition temperature of the flammable refrigerant.
The design of the defrosting means 18 to make the temperature lower than the ignition temperature is easy.
Heater while maintaining the ignition temperature of the flammable refrigerant below
An increase in the total heating value of the line 23 is possible. (Embodiment 20) Embodiment of the present invention
State 20 will be described with reference to the drawings. In addition,
The same components as those in the nineteenth embodiment are denoted by the same reference numerals.
And a detailed description is omitted. FIG. 21 shows a twentieth embodiment of the present invention.
FIG. 22 is a sectional view of a main part, and FIG.
It is a degree characteristic figure. As shown in FIGS. 21 and 22, the horizontal axis represents the spa.
The length of the heater wire 23 existing within the length L of the
The amount of heat generated by the heat of the heater is equivalent to the length L of the spiral part 25
Of the inner surface of the glass tube divided by the surface area of the inner surface 32 of the glass tube
Heat value per unit surface area, vertical axis is a table of heater wires 23
Surface temperature. The refrigerant of the refrigeration cycle is isobutane.
It is. [0158] The refrigerator-freezer constructed as described above is described.
The operation will be described below. At the time of defrosting, the heater is connected through the lead wire 27.
The wire 23 is energized, and the heater wire 23 is
Fever. At this time, the defrosting means 18 is
Surface area of the glass tube inner surface 32 of the portion existing within the length L
Joule heating value per unit is 1.6 W / cm^TwoLess fever
Defrost evaporator 10 by volume. Here, the surface temperature of the heater wire 23 is
Unit surface which is Joule heat to the surface area of the pipe inner surface 32
As the calorific value per product increases, its unit surface increases
1.6W / cm of heat value per product^TwoFlammable above
The ignition temperature of the ionic refrigerant. That is, the glass tube 22 is
Having an area of the glass tube inner surface 32 that is suitable for the amount of heat generated
If not designed, the heater tube 23 must be
The amount of heat radiated to the outside decreases, and the defrosting ability decreases.
At the same time, the temperature of the heater wire 23 rises. Therefore, the surface area of the inner surface 32 of the glass tube is
Per unit area, which is the Joule heat of the heater 23
1.6 W / cm^TwoThe glass tube 22
The heat transfer area to compensate for the decrease in heat transfer due to the temperature drop
And the total heat radiation from the glass tube 22 remains the same as before.
While the glass tube correlated with the temperature of the heater wire 23
22 can be lowered. From this, it can be seen that the defrosting ability and the same
The heater wire 23 with flammable refrigerant
The temperature is lower than the ignition temperature, and the flammable refrigerant is
Risk of fire even if defrosting is performed
Can be reduced. Further, the total heat value of the heater wire 23 is
As the temperature increases, the surface temperature of the heater wire 23 increases,
Even if the total heat generation is increased, the unit area
1.6W / cm^TwoDesigned to be less than
By doing so, regardless of the overall heating value of the heater wire 23
The heater wire 23 can be set below the ignition temperature of the flammable refrigerant.
Thus, the defrosting means 18 for setting the ignition temperature of the flammable refrigerant below the ignition temperature is provided
Gauge and maintain the temperature below the ignition temperature of the flammable refrigerant.
It is possible to increase the total calorific value of the heater wire 23. In the present embodiment, the heater
The temperature of the line 23 is lower than the ignition temperature of isobutane
However, if an isobutane refrigerant is used,
Considering the safety factor for the ignition temperature of the tongue of about 460 ° C
It is necessary to keep the heater wire 23 temperature below 360 ° C.
In this case, the calorific value per unit surface area inside the unit glass tube is
0.67W / cm^TwoThe following is assumed. (Embodiment 21) Embodiment of the present invention
State 21 will be described with reference to the drawings. In addition,
The same components as those in the first to twentieth embodiments have the same reference numerals.
And the detailed description is omitted. FIG. 23 shows Embodiment 21 of the present invention.
It is sectional drawing of a principal part. As shown in FIG. 23, reference numeral 34 denotes a glass tube.
The gas inside the tube, D is the spy of the heater wire 23
Is the outer diameter of the tube portion 25, and d is the inner diameter of the glass tube 22.
And the outer periphery of the spiral portion 25 of the heater wire 23
The distance from the pipe inner surface 32 is 1 mm. [0168] The refrigerator-freezer constructed as described above is described.
The operation will be described below. At the time of defrosting, the heater of the defrosting means 18
The heat radiated from the surface of the wire 23 is
Of the air 34 having low thermal conductivity between the inner surfaces of the pipes 22.
Through the thickness of the glass tube 22 through the layer 1 mm, the glass tube 2
2 is radiated to the outside from the outer surface. Therefore, the thermal conductivity
By reducing the layer of low pipe air 34 to 1 mm,
Heat transfer from the inner surface 22 of the glass tube from the
Promotes heat dissipation to the heater and promotes defrosting,
23 has a lower surface temperature. Furthermore, the tolerance of the inner diameter d of the glass tube 22 and
Is the tolerance of the outer diameter D of the spiral part 25 of the heater wire 23?
Put the heater wire 23 inside the glass tube 22
It is easy to work when inserting. From this, the workability in manufacturing is equivalent to that of the prior art.
And maintain a defrosting capacity and service life equal to or better than
While maintaining the heater wire 23 at the ignition temperature of the flammable refrigerant.
Flammable refrigerant leaks into the atmosphere of the defrosting means 18
If the defrost is performed, the risk of ignition is lower.
Wear. In this embodiment, the heater wire 23
The outer peripheral portion of the spiral portion 25 and the inner surface 32 of the glass tube 22
Is 1 mm, but if it is less than this, the same effect can be obtained.
The fruit is obtained. The gas in the glass tube 22 is air.
However, similar effects can be obtained if the thermal conductivity is poor.
You. In this embodiment, the heater wire 23
The temperature is set to be lower than the ignition temperature of the flammable refrigerant
However, using isobutane as a refrigerant,
In order to prevent fires, the heater wire 23 was
In order to reduce the temperature to 0 ° C. or less, the spiral of the heater wire 23
The distance between the outer peripheral portion of the portion 25 and the inner surface 32 of the glass tube 22 is 1
mm or less, the surface area of the heater wire 23
0.67 W / cm^TwoBelow
And the heater wire 23 has a
0.67W / cm^TwoBy doing the following
The temperature of the heater wire 23 can be effectively reduced to 360 ° C or less.
You. (Embodiment 22) Embodiment of the present invention
The state 22 will be described with reference to the drawings. In addition,
The same components as those in the first to twentieth embodiments have the same reference numerals.
And the detailed description is omitted. FIG. 24 shows Embodiment 22 of the present invention.
It is sectional drawing of a principal part. [0176] As shown in FIG.
The spiral part 25 and the inner surface 32 of the glass tube are in contact with each other. [0177] The refrigerator-freezer constructed as described above will be described.
The operation will be described below. At the time of defrosting, the heater of the defrosting means 18
Part of the heat radiated from the surface of the wire 23 is the inner surface 3 of the glass tube.
2 to the glass tube 22 through the contact surface with the
The heat is radiated to the outside from the outer surface 33, and the others are
Glass from the glass tube inner surface 32 through the air 34 inside the tube
The heat is radiated from the outer surface 33 of the glass tube through the inside of the glass tube 22.
You. At this time, the glass tube 22 is
Heat conduction is very good compared to the heater wire.
The heat transfer is promoted by the contact between 23 and the inner surface 32 of the glass tube,
The amount of heat radiation from the heater wire 23 increases, and defrosting is promoted.
At the same time, the temperature of the heater wire 23 decreases. From this, it can be seen that the defrosting ability and the conventional
The heater wire 23 with flammable refrigerant
The temperature is lower than the ignition temperature, and the flammable refrigerant is
Risk of fire even if defrosting is performed
Can be reduced. (Embodiment 23) Embodiment of the present invention
The state 23 will be described with reference to the drawings. In addition,
The same components as those in Embodiments 1 to 22 have the same reference numerals.
And the detailed description is omitted. FIG. 25 shows Embodiment 23 of the present invention.
FIG. 26 is a cross-sectional view of a main part.
It is a longitudinal cross-sectional view which is a cross section. As shown in FIGS. 25 and 26, the defrosting means 1
8 is a glass tube 22 in which a heater wire 23 is installed.
A roof 16 is provided above, and the shape of the roof 16 is U-shaped.
The edges on both sides of the U-shape are 35, and the opening of the U-shape is
Is located below. In addition, J is ya
Determination of the dimension of the shortest distance between the root 16 and the outer surface 33 of the glass tube
Value and the arrow is the path of convective air. [0184] The refrigerator-freezer constructed as described above is described.
The operation will be described below. At the time of defrosting, the heat generated by the heater wire 23 causes
The pipe outer surface 33 is heated and transmitted to the surrounding air, raising the temperature.
It moves upward by convection. And the roof 16
Filling into the shape, overflow from the edge 35 to the roof 16
To defrost the evaporator 10 and its surrounding parts
You. The defrosted and liquefied water drops on top of the roof 16,
Dropping on the glass tube 22 along the U-shaped edge 35
Instead, it is dropped below the defrosting means 18. At this time, the roof 16 is located above the glass tube 22.
Temperature rises due to exposure to hot air in the U-shape
Then, the temperature also rises above the heater wire 23. So ya
The distance between the root 16 and the glass tube 22 should be more than a predetermined value J
The high-temperature air and glass tube filled in the U-shape of the roof 16
Since there is no portion where the glass tube 22 comes into contact, the temperature of the glass tube 22 is reduced.
Temperature decreases, and the temperature of the heater wire 23 decreases accordingly.
I do. [0187] From this, it can be seen that the defrosting ability and the conventional defrosting ability are equal to or higher than the conventional ones.
The heater wire 23 with flammable refrigerant
The temperature is lower than the ignition temperature, and the flammable refrigerant is
Risk of fire even if defrosting is performed
Can be reduced. (Embodiment 24) Embodiment of the present invention
State 24 will be described with reference to the drawings. In addition,
The same components as those in Embodiments 1 to 23 are denoted by the same reference numerals.
And the detailed description is omitted. FIG. 27 shows Embodiment 24 of the present invention.
It is sectional drawing of a principal part. As shown in FIG. 27, the thickness of the glass
Is 1.0 mm. [0191] The refrigerator-freezer constructed as described above is described.
The operation will be described below. The heat generated from the heater wire 23 during defrosting
Is the thickness of the glass tube 22 from the inner surface 32 of the glass tube.
The heat is radiated to the outside from the pipe outer surface 33 and
Defrost the side parts. At this time, the thickness of the glass tube 22 is
Since it is 1.0 mm, the strength of the glass tube 22 is maintained.
From the heater wire 23 by promoting the heat transfer of the glass tube 22
The amount of heat dissipated through the lath tube 22 increases, and defrosting is promoted.
At the same time, the temperature of the heater wire 23 decreases. From this, it can be seen that the defrosting ability and the conventional
The heater wire 23 with flammable refrigerant
The temperature is lower than the ignition temperature, and the flammable refrigerant is
Risk of fire even if defrosting is performed
Can be reduced. In this embodiment, the thickness of the glass tube 22 is
1.0mm, but if it is 1.5mm or less, the degree of effectiveness
A different but similar effect can be obtained. (Embodiment 25) Embodiment of the present invention
State 25 will be described with reference to the drawings. In addition,
The same components as those in Embodiments 1 to 24 have the same reference numerals.
And the detailed description is omitted. FIG. 27 shows an embodiment 25 of the present invention.
It is sectional drawing of a principal part. As shown in FIG. 27, the material of the glass tube 22
Is quartz. [0198] The refrigerator-freezer constructed as described above is described.
The operation will be described below. Before and after defrosting, the freezing room 2 of the refrigerator body 1 and the cold room 2
Refrigerant flows through the evaporator 10 to cool the storage 3 and evaporates.
The glass tube 22 of the defrosting means 18 located around the vessel 10
It becomes minus temperature. At the time of defrosting, the defrosting means 18
The heater wire 23 generates heat due to the operation, and the glass tube heats up.
The temperature becomes high in a short time and the glass tube 22
Temperature fluctuations of 300-450 ° C. occur during the interval. At this time, in the conventional glass tube, the difference in linear expansion
May be damaged, and flammable cold
Defrosting is performed when the medium leaks into the atmosphere of the defrosting means 18.
Flammable refrigerant may ignite. However, in quartz glass, the line due to temperature fluctuation
Flammable refrigerant is removed because it does not break due to small expansion.
If it leaks into the atmosphere of the frost means 18, defrost is performed
However, the risk of ignition can be further reduced. (Embodiment 26) Embodiment of the present invention
The state 26 will be described with reference to the drawings. In addition,
The same components as those in Embodiments 2 to 25 are denoted by the same reference numerals.
And the detailed description is omitted. FIG. 28 shows an embodiment 26 of the present invention.
FIG. 29 is a diagram of a refrigeration system, and FIG.
It is sectional drawing of the refrigerator in 6. As shown in FIGS. 28 and 29, 36 is refrigerated
Refrigerator cooler, which has a high evaporation temperature, 37 is a high evaporation temperature
Pressure reduction mechanism for high evaporation temperature with small pressure reduction for temperature, 38 for cold
Freezer cooler with low evaporation temperature for freezing, 39 is low evaporation
The decompression mechanism for low evaporation temperature, which has a large decompression amount for temperature, 40 is
A switching valve for switching the flow path of the refrigerant.
Refrigerant flows backward from storage compartment cooler 36 to freezer compartment cooler 38
This is a check valve that prevents the check valve from being operated. Numeral 42 denotes the air in the refrigerator compartment 3 for the refrigerator cooler 3.
6 to cool and circulate cooling air
Storage compartment fan, 43 is a refrigerator for freezer compartment air
38 for heat exchange and cooling air
Freezer compartment fan 44 is connected to refrigerator compartment cooler 36
3 to prevent the heat transfer to
Refrigerator cooler, which is also a duct for smooth wind flow
The cut wall 45 is for the refrigerator compartment by the operation of the refrigerator compartment fan 42.
Refrigeration in which cold air exchanged with the cooler 36 is discharged to the refrigeration compartment 3
The chamber discharge port 46 smoothly ventilates the freezer cooler 38.
47, a freezer compartment cooler partition wall forming a duct for
Is operated by the operation of the freezing room fan 43,
A freezer compartment outlet from which cold air that has exchanged heat with the freezer compartment is discharged to the freezer compartment 2;
48 is a defrost generated when the freezer cooler 38 is defrosted.
An evaporating dish for storing water and automatically evaporating it. [0206] Regarding the refrigerator configured as described above,
The operation will be described below. When cooling the refrigerator compartment 3, the refrigerator compartment 3 is
When the temperature exceeds the set temperature, the compressor 19 operates,
The circulation of a combustible refrigerant (not shown) in the
The refrigerant is condensed by heat exchange with the outside air in the condenser 20,
Refrigerated via high evaporating temperature decompression mechanism 37 by switching valve 40
When it flows into the room cooler 36 and is sucked into the compressor 19,
The refrigeration cycle for cooling the refrigerator compartment of the route described above. At this time, the refrigerator 19 is refrigerated simultaneously with the operation of the compressor 19.
The air in the refrigerator compartment 3 is refrigerated by the operation of the room fan 42.
The air is sucked from the chamber suction port 8 and ventilated to the refrigerator cooler 36.
Chilled air cooled by heat exchange
It is discharged to the chamber 3 to cool the refrigerator compartment 3. At any time during which the compressor 19 is stopped,
Then, the refrigerator compartment fan 42 is operated, and the temperature of the refrigerator compartment 3 is reduced to 0 ° C.
The air having a temperature exceeding the maximum temperature passes through the refrigerator cooler 36,
The frost that has formed on the refrigerator cooler 36 due to the ventilation air
Defrosted by flower and passed through refrigerator 36
After the air is cooled, the absolute humidity is increased and discharged into the refrigerator compartment 3.
It is. When freezing room 2 is cooled, freezing room 2
When the temperature exceeds the set temperature, the compressor 19 operates,
The circulation of the flammable refrigerant in the vehicle starts, and the flammable refrigerant
Condensed by heat exchange with the outside air in the compressor 20
Through the decompression mechanism 39 for the low evaporation temperature and the refrigerator for the freezer compartment
38 and is drawn into the compressor 19
It becomes a refrigeration cycle for freezing room cooling. Then, at the same time as the operation of the compressor 19,
The operation of the fan 43 causes the air in the freezer 2 to be released from the freezer.
Inhale from the inlet 7 and ventilate the freezer cooler 38
The air cooled by heat exchange is cooled through the freezer outlet 47 to the freezer.
2 to cool the freezer compartment 2. At this time, for the freezer
The air passing through the cooler 38 is air only in the freezing room 2.
Therefore, the refrigerator 38 is small and has a heat exchange area of
Since it is small, the frost area is small and the amount of frost is small. When the compressor 19 is stopped or when the refrigerator 19
At any time during the refrigeration, the defrosting means 18 is activated,
The defroster 38 and its peripheral parts are defrosted. At this time,
The refrigerant in the piping of the freezer cooler 38 is also heated. Soshi
Then, the heated refrigerant evaporates in the refrigerator cooler 38.
The low portion which is not yet heated by the defrosting means 18
Moves to the temperature area, removing heat from the frost in that area. Then, the frost melts, and the refrigerant removes heat from the frost.
Condensed. At this time, part of the condensed refrigerant
It remains in the freezer compartment cooler 38 and is again processed by the defrosting means 18.
Get heated. By repeating this operation, the freezer compartment cooler
The defrosted water, which has been defrosted and turned into water, falls into the tub 13
The water falls from the drain port 14 into the evaporating dish 48 and is stored. Evaporating dish
The defrost water stored at 48 generates heat during the operation of the compressor 19.
Receiving spontaneous evaporation. As described above, the freezer compartment cooler 38 is provided in the freezer compartment.
Since only 2 is cooled, the amount of frost is small.
8, the amount of heat generated by the defrosting means 18 can be reduced.
Of the temperature decreases. [0215] In addition, a single cooler of the related art requires a refrigeration cycle.
Most of the total refrigerant amount in the evaporator 10 is in the evaporator 10 which is a cooler.
Because of the presence, the heating by the defrosting means 18 during defrosting
A large amount of heat is required.
A large amount of heating of the refrigerant is required. However, in the present invention
Is partially present in the refrigerator cooler 36,
The amount of refrigerant in the freezer compartment cooler 38 is based on one conventional cooler.
It is very low compared to
Because the amount of heat used for heating by the step 18 is small,
It is energy saving. As described above, the defrosting ability is equal to or higher than the conventional one.
While maintaining the power, the defrost means 18 is set to the ignition temperature of the flammable refrigerant.
The flammable refrigerant can be reduced to a temperature lower than
When defrosting is performed in an environment that has leaked into the atmosphere
Also, the danger due to the ignition of the flammable refrigerant can be further reduced. (Embodiment 27) Embodiment of the present invention
State 27 will be described with reference to the drawings. In addition,
The same components as those in Embodiments 1 to 26 are denoted by the same reference numerals.
And the detailed description is omitted. FIG. 30 shows a twenty-seventh embodiment of the present invention.
It is a longitudinal section of the important section. As shown in FIG. 30, reference numeral 49 denotes a roof
Is an upper swash plate which is located on one side of
Is the other side of the C on the roof 16 and below the upper swash plate 49
The lower swash plate 51 is located between the upper swash plate 49 and the lower swash plate.
This is a gap between the plates 50. The arrow indicates the sky around the defrosting means.
It is the path of qi. With respect to the refrigerator configured as described above,
The operation will be described below. At the time of defrosting, the heater wire 23 of the defrosting means generates heat.
The heater wire 23 and the gas around the heater wire 23
The temperature of the lath tube 22 increases. And of the glass tube 22
The air in the vicinity is heated, and the upper swash plate of the roof 16 as shown by the arrow
49 and the lower swash plate 50, and a part thereof passes through the gap 51.
To the evaporator 10 above,
Defrosts by exchanging heat with the attached frost. And defrost
The water is dropped on the upper swash plate 49 and the lower swash plate 50,
Upper swash plate 49 and lower swash plate 50
And fall down. From this, the defrosting means 18 can be used as in the prior art.
Since the defrost water does not drop directly on the glass tube 22 of
There is no conventional gap 51 while ensuring the same life as before
The air heated by the defrosting means 18 against the roof 16
Since it can be moved to the evaporator 10 smoothly,
When the amount of heat released to the
In addition, the amount of heat radiation to the outside increases,
The amount of heat used to raise the temperature of the
The surface temperature of the heater wire 23 further decreases, and the
It can be below the ignition temperature. [0223] As described above, the present invention provides:Freezer compartment
And the refrigeration room are provided independently so that there is no convection of air.
Refrigerator body and high evaporation temperature for compressor, condenser and refrigeration
A cooler for a refrigerator, a high-vapor-
Decompression mechanism for generating temperature, for freezing room with low evaporation temperature for freezing
Cooler, reduced pressure for low evaporation temperature, large pressure reduction for low evaporation temperature
Through the mechanism and the decompression mechanism for the high evaporation temperature.
Refrigeration compartment cooling system
Cycle and the decompression mechanism for the low evaporation temperature
Cooling for the freezer compartment which flows to the cooler and is sucked into the compressor
The function is connected to a switching valve that switches between the cycle and
A refrigeration system filled with a flammable refrigerant;
Refrigeration that circulates air exchanged with the heat exchanger in the refrigerator compartment
A room fan and air that has exchanged heat with the freezer compartment cooler
A freezing room fan circulating in the freezing room;
Below the ignition temperature of the flammable refrigerant to defrost the room cooler
A defrosting means for reducing the heat generation temperature, wherein the compressor
During deactivation or during cooling of the refrigerator compartment,
To defrost the freezer compartment cooler, while the compressor is stopped.
When it can be sublimated by ventilation of air at a temperature exceeding 0 ° C
During the operation, the refrigerator compartment fan is operated to operate the refrigerator compartment cooler.
ofFreezer compartment cooler cools only the freezer compartment because defrosting is performed
What is necessary is to use only one conventional cooler for refrigerators and freezers
It is small for a cooler that cools all rooms such as
The heat exchange area is reduced, the amount of frost is reduced, and the defrost
The amount of heat can be reduced, and the temperature of the defrosting unit decreases due to the lower heat generation.
Can be achieved. [0224] Furthermore, a single conventional cooler requires a refrigeration cycle.
Most of the total refrigerant in the tank is in the evaporator, which is the cooler
A large amount of heat for heating by the defrosting means during defrosting
The amount of heat required for defrosting,
While a large amount of heating is required, in the present invention the refrigerant
Is partly located in the refrigerator compartment cooler,
The amount of refrigerant in the cooler is much higher than with a single cooler.
It becomes less, and it is heated by defrosting means other than defrosting at the time of defrosting
Energy consumption is reduced because less heat is used.
You. From this, the defrosting ability equal to or higher than the conventional one
While keeping the defrosting means below the ignition temperature of the flammable refrigerant
The temperature can be lowered, and the flammable refrigerant is
If defrosting is performed in an environment that leaks into the installation atmosphere
Can reduce the risk of ignition of flammable refrigerants
You. [0226] Further, while the compressor is stopped, the refrigerator compartment fan is turned on.
As it operates, it is cooled by air exceeding 0 ° C in the refrigerator compartment.
Sublimation defrosting can be performed on the frost of the storage room cooler.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a refrigeration system diagram of a refrigerator-freezer according to Embodiment 1 of the present invention. FIG. 2 is a longitudinal sectional view of a main part of the refrigerator-freezer according to Embodiment 2 of the present invention. FIG. 4 is a cross-sectional view of a main part according to a third embodiment of the present invention. FIG. 4 is a cross-sectional view of a main part according to a fourth embodiment of the present invention. FIG. 7 is a characteristic view of a main part according to a fifth embodiment of the present invention. FIG. 7 is a cross-sectional view of a main part according to a sixth embodiment of the present invention. FIG. 10 is a sectional view of a main part according to a seventh embodiment of the present invention. FIG. 10 is a characteristic diagram of a main part according to the seventh embodiment of the present invention. FIG. 11 is a cross-sectional view of a main part according to the eighth embodiment of the present invention. FIG. 12 is a wiring diagram of a main part according to a ninth embodiment of the present invention. FIG. 14 is a wiring diagram of a main part according to an eleventh embodiment of the present invention. FIG. 15 is a wiring diagram of a main part according to a twelfth embodiment of the present invention. FIG. 16 is an embodiment of the present invention. FIG. 17 is a wiring diagram of a main part in Embodiment 14 of the present invention. FIG. 18 is a sectional view of a main part in a fifteenth embodiment of the present invention. FIG. 20 is a cross-sectional view of a main part in Embodiment 16; FIG. 20 is a cross-sectional view of a main part in Embodiments 17 and 18 of the present invention; FIG. 21 is a cross-sectional view of a main part in Embodiments 19 and 20 of the present invention; FIG. 22 is a characteristic diagram of a main part in Embodiment 20 of the present invention. FIG. 23 is a cross-sectional view of a main part in Embodiment 21 of the present invention. FIG. 24 is a main part in Embodiment 22 of the present invention. FIG. 25 is a side view of a main part according to the twenty-third embodiment of the present invention. FIG. 26 is a longitudinal sectional view of a main part in Embodiment 23 of the present invention. FIG. 27 is a cross-sectional view of a main part in Embodiments 24 and 25 of the present invention. FIG. 29 is a cross-sectional view of a refrigerator in a twenty-sixth embodiment of the present invention. FIG. 30 is a longitudinal sectional view of a main part in a twenty-seventh embodiment of the present invention. 1 Refrigerator body 2 Freezer compartment 3 Refrigerator compartment 10 Evaporator 16 Roof 18 Defrosting means 19 Compressor 20 Condenser 21 Decompression mechanism 22 Glass tube 23 Heater wire 24 Straight line portion 25 Spiral portion 28 Metal 30 Temperature fuse 31 Temperature detection means 32 Glass tube inner surface 33 Glass tube outer surface 36 Refrigerator room cooler 37 High evaporation temperature decompression mechanism 38 Freezer room cooler 39 Low evaporation temperature decompression mechanism 40 Switching 41 check valve

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-10-47827 (JP, A) JP-A-9-264650 (JP, A) JP-A-9-329386 (JP, A) JP-A-57-1979 192776 (JP, A) (58) Field surveyed (Int. Cl. ⁷ , DB name) F25D 21/08

Claims (1)

(57) [Claims 1] A refrigerator body in which a freezing room and a refrigerator room are independently provided so as to prevent air convection, and a compressor, a condenser, and a high evaporation temperature for refrigeration. A refrigerator for a refrigerator, a decompression mechanism for a high evaporation temperature with a small decompression for a high evaporation temperature, a refrigerator for a freezing room with a low evaporation temperature for freezing, a low evaporation
Large decompression for temperature
Before flowing to the refrigerator compartment cooler through the decompression mechanism for generating temperature
The cooling cycle for the refrigerator compartment sucked into the compressor and
After flowing through the evaporating temperature decompression mechanism to the refrigerator freezer,
Turn off the cooling cycle for the freezer compartment sucked into the compressor.
A refrigeration system in which a switching valve for switching is functionally connected, and a refrigeration system in which a flammable refrigerant is filled , and air that has exchanged heat with the refrigerator compartment cooler is placed in the refrigerator compartment.
A refrigerating room fan to be circulated, and a freezing room cooler and heat.
A freezer compartment circulating the exchanged air into the freezer compartment.
And the flammable refrigerant for defrosting the freezer cooler.
A defrosting means for lowering the heat generation temperature below the ignition temperature , wherein the compressor is stopped or the refrigerator compartment is being cooled.
Defrosting the freezer compartment cooler by frost means;
Sublimation due to the ventilation of air at a temperature exceeding 0 ° C during shutdown
Operate the refrigerator compartment fan for as long as possible to
Refrigerator characterized by performing defrosting of a refrigerator for air conditioning .