WO2000070281A1 - Refrigerateur et element chauffant degivreur - Google Patents
Refrigerateur et element chauffant degivreur Download PDFInfo
- Publication number
- WO2000070281A1 WO2000070281A1 PCT/JP2000/003091 JP0003091W WO0070281A1 WO 2000070281 A1 WO2000070281 A1 WO 2000070281A1 JP 0003091 W JP0003091 W JP 0003091W WO 0070281 A1 WO0070281 A1 WO 0070281A1
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- WO
- WIPO (PCT)
- Prior art keywords
- temperature
- glass tube
- defrosting
- heater
- heater wire
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
- F25D29/006—Safety devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/06—Removing frost
- F25D21/08—Removing frost by electric heating
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/12—Inflammable refrigerants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D2400/00—General features of, or devices for refrigerators, cold rooms, ice-boxes, or for cooling or freezing apparatus not covered by any other subclass
- F25D2400/24—Protection against refrigerant explosions
Definitions
- the present invention relates to a refrigerator having defrosting means for defrosting an evaporator with a single heater.
- 1 is a refrigerator housing
- 2 is a freezer compartment inside the refrigerator housing 1
- 3 is a refrigerator compartment inside the refrigerator housing 1
- 4 is a freezer compartment door
- 5 is a refrigerator compartment door
- 6 is a refrigerator compartment door.
- 7 is a freezer compartment inlet that sucks air in the freezer compartment 2
- 8 is a refrigerator compartment inlet that sucks air in the refrigerator compartment 3
- 9 is a cool air outlet.
- a discharge port, 10 is an evaporator
- 11 is a fan for circulating cool air.
- 1 2 is an evaporator partition wall that separates the evaporator 10 and the freezer 2
- 1 3 is a trough
- 14 is a drain port
- 15 is a defrosting coiled nichrome wire covered with a glass tube
- a tube heater, 16 is a roof to prevent evaporative noise generated when defrost water directly drops on and contacts the defrost tube heater
- 17 is a tub 13 and a defrost tube heater 15 It is a metal bottom plate that is installed and held between them.
- the refrigerant flows through the evaporator 10 to cool the evaporator 10.
- the heated air in the freezer 2 and the refrigerator 3 is sent from the freezer inlet 7 and the refrigerator inlet 8 to the cooling room 20, and heat is exchanged in the evaporator 10.
- the cooling air is sent from the discharge port 9 into the freezing compartment 2, and the cool air is sent from the freezing compartment 2 to the refrigerating compartment through a communication port (not shown).
- the air that exchanges heat with the evaporator 10 is high due to the inflow of high-temperature outside air by opening and closing the freezer compartment door 4 and the refrigerator compartment door 5 and the evaporation of moisture from the stored food in the freezer compartment 2 and the refrigerator compartment 3. Since the air is humidified, moisture in the air becomes frost and forms frost on the evaporator 10 which is at a lower temperature than the air. As the amount of frost increases, the heat transfer between the evaporator 10 surface and the air that exchanges heat is hindered, and the air flow decreases due to the ventilation resistance, resulting in a decrease in the heat transfer rate and insufficient cooling. .
- the defrosting tube heater 15 when the defrosting tube heater 15 is generally energized, the temperature of the glass surface reaches a very high temperature, not to mention the surface of the nichrome wire.
- the bottom plate 17 since the bottom plate 17 is located near the tube heater 15 and reflects some of the heat rays radiated from the tube heater 15 back to the tube heater 15, the heating temperature of the tube heater 15 becomes abnormal. Rises above the ignition temperature of the flammable refrigerant.
- the present invention has been made in view of the above problems, and provides a refrigerator-freezer that can suppress the risk of ignition of a flammable refrigerant even when defrosting is performed in an environment in which the flammable refrigerant has leaked into an installation atmosphere of a defrosting unit.
- the purpose is to do.
- a refrigerator comprises: a refrigeration cycle in which a compressor, a condenser, a decompression mechanism, and an evaporator are functionally connected to each other, and a flammable refrigerant sealed therein; Means, and the defrosting means has a heating temperature lower than the ignition temperature of the combustible refrigerant. Therefore, when the flammable refrigerant leaks into the refrigerator due to a broken pipe or the like, even if the defrosting unit starts to generate heat for defrosting, the risk of ignition is extremely low.
- the defrosting means it is desirable to provide a glass tube and a heater wire made of a metal resistor inside the glass tube.
- the heater wire is heated to a temperature lower than the ignition temperature of the flammable refrigerant. Good to be. Most of the heat generated by radiation from the heater line, which is a heating element, passes through the glass tube and is emitted to frost adhering to the evaporator and peripheral parts. At the same time, the heater line can prevent corrosion deterioration due to direct contact with defrost water. Therefore, the defrosting ability and the service life which are equal to or higher than the conventional one can be secured, and the surface temperature of the heater wire which may come into contact with the outside air is lower than the ignition temperature of the flammable refrigerant.
- the surface temperature of the heater wire at the central portion of the length of the spiral portion is a heating temperature lower than the ignition temperature of the flammable refrigerant.
- the linear surface temperature of the heater at the central portion where the temperature is high in the length direction of the spiral portion lower than the ignition temperature of the flammable refrigerant. Therefore, the entire heater wire can be set at a temperature lower than the ignition temperature of the flammable refrigerant.
- the heater wire be heated so that the surface temperature of the upper part of the spiral portion is lower than the ignition temperature of the flammable refrigerant.
- the heating temperature at the top of the heater wire where the temperature rises above and below the spiral due to the upward movement of the hot gas due to the heat generated by the heater wire, must be lower than the ignition temperature of the flammable refrigerant Can be. Therefore, the entire heater line becomes lower than the ignition temperature of the flammable refrigerant.
- the heater wire includes a linear portion having both ends formed in a straight line and a spiral portion formed in the other portion in a spiral shape, and a heat value per unit area obtained by dividing a heat value of the spiral portion due to Joule heat by its surface area. Is preferably less than 2.5 WZ cm 2 .
- the heater line is It will be lower than the ignition temperature of the flammable refrigerant.
- the heater wire is designed so that the firing temperature of the flammable refrigerant can be lower than the ignition temperature of the flammable refrigerant regardless of the overall heating value of the heater wire.
- the defrosting means for lowering the ignition temperature of the flammable refrigerant it is possible to easily design the defrosting means for lowering the ignition temperature of the flammable refrigerant, and it is possible to increase the total heating value of the heater wire while maintaining the ignition temperature of the flammable refrigerant below the ignition temperature. It is.
- the heater wire is divided by the volume enclosed by the outer diameter and length of the spiral portion of the calorific value of the spiral portion 8. 5 WZ cm may be less than 3, the defrosting of the above prior art the like even in this case The capacity and life can be ensured, and the total heating value of the heater wire can be increased while maintaining the temperature below the ignition temperature of the flammable refrigerant.
- spiral heater wire is lower than the ignition temperature of the flammable refrigerant without affecting the outer diameter of the section.
- the value obtained by dividing the calorific value per unit surface area of the spiral part of the heater wire by a coefficient obtained by dividing the pitch of the spiral part by the outer diameter is less than 9.2 WZ cm 2 .
- the pitch and the outer diameter of the spiral portion changes also, the value obtained by dividing the coefficient divided by Supairanore outer diameter the pitch of the spiral portion of the calorific value per unit area of the spiral Le portion 9. 2 WZ cm less than 2 If the design is made such that the pitch of the spiral part ⁇ the outer diameter is not affected, the temperature of the heater line will be lower than the ignition temperature of the flammable refrigerant. Further, if the pitch of the spiral portion of the heater line is set to 2 mm or more, the influence of the adjacent heater lines of the spiral portion can be reduced. From this, the temperature variation due to the variation in the pitch of the spiral portion can be reduced, so that the entire heater line becomes lower than the ignition temperature of the flammable refrigerant.
- the heater wire is partially made of metal that melts below the ignition temperature of the flammable refrigerant, if the heating temperature of the heater wire approaches the ignition temperature of the flammable refrigerant, the temperature of the heater wire will change to the temperature fuse. Of the metal, thus at a given temperature below the ignition temperature As a result, the metal of the temperature fuse is melted, and the heating wire is prevented from rising above the ignition temperature of the flammable refrigerant by shutting off the input.
- a temperature fuse made of a metal that melts at a temperature lower than the ignition temperature of the flammable refrigerant is connected in series with the defrosting means, and is installed near the defrosting means.
- the heating temperature of the heater line is transmitted to the metal of the temperature fuse, and at a predetermined temperature lower than the ignition temperature, the metal of the temperature fuse is blown, and the heater wire is cut off.
- the thermal fuse is damaged by any effect and there is no problem with the defrosting means, maintenance is easy because only the thermal fuse needs to be replaced.
- the thermal fuse may be closely attached to the outer surface of the defrosting means, or may be closely attached to the outer surface of the upper part of the defrosting means.
- the surface temperature of the defrosting means can be more accurately transmitted to the temperature fuse, and the defrosting means raises the temperature above the ignition temperature of the flammable refrigerant by shutting off the input below the ignition temperature of the flammable refrigerant.
- the maintenance of only the thermal fuse is easy.
- the temperature fuse is blown by detecting the temperature of the upper part which is the hottest part in the vertical direction of the defrosting means, and the entire defrosting means is set to a predetermined temperature lower than the ignition temperature of the flammable refrigerant. By shutting off the input, the temperature rise above the ignition temperature of the flammable refrigerant is further suppressed, and the maintenance is easy.
- the thermal fuse made of metal that is wired in series with the defrosting means and melts at a temperature lower than the ignition temperature of the flammable refrigerant is the outer surface of the lower part of the defrosting means, or the central part in the longitudinal direction of the defrosting means. May be in close contact with the outer surface of the device. In the former case, the temperature fuse does not drop due to the direct contact of the defrosting water dropped from the evaporator etc. above the defrosting means, so it can accurately detect the heating temperature of the defrosting means and remove the temperature. It has the effect that the temperature rise above the ignition temperature of the frost means is more accurately suppressed and maintenance is easy.
- the central portion which is the high-temperature portion in the length direction of the defrosting device
- the temperature fuse closely attached to that portion is blown, and the defrosting is performed.
- the frost means shuts off the input, and the flammable refrigerant This has the effect of further suppressing the temperature rise and facilitating maintenance of only the temperature fuse.
- the defrosting means has a glass tube and a heater line made of a metal resistor installed inside the glass tube, and a temperature fuse is closely attached to a surface of the glass tube.
- the metal that is a component of the thermal fuse is blown at a temperature that is lower than the ignition temperature of the flammable refrigerant by 100 to 200 ° C. Therefore, when the heater wire, which is a heating element, reaches a predetermined temperature near the ignition temperature of the flammable refrigerant and lower than the ignition temperature, the surface of the glass tube around the heater line transfers heat from the heater wire to the glass tube. The temperature is lowered by 200 ° C. from the predetermined temperature of 100 ° C. due to the heat taken away.
- the temperature fuse closely attached to the surface of the glass tube is blown, and the input of the heater is cut off to prevent the temperature above the ignition temperature of the flammable refrigerant from being cut off, and maintenance of only the thermal fuse is easy. It is.
- the heater wire is composed of a linear portion having a linear shape and a spiral portion having a spiral shape
- the temperature fuse is formed of a metal which melts at a temperature lower than the ignition temperature of the flammable refrigerant. It may be installed on the surface of the glass tube around the straight part of the straight line. In this case, when the temperature reaches a predetermined temperature lower than the ignition temperature of the flammable refrigerant, the temperature fuse closely attached to that part is blown, and the defrosting means cuts off the input to raise the temperature above the ignition temperature of the flammable refrigerant. In addition to being suppressed, maintenance of only the thermal fuse is easy. Furthermore, since the glass surface temperature of the outer periphery of the straight portion is lower than the glass tube surface of the outer periphery of the spiral portion of the heater wire, a temperature fuse that blows at a lower temperature can be used, and it is inexpensive.
- the defrosting means is to install a glass tube and a heater line made of a metal resistor inside the glass tube, while the heater line is a straight line portion having both ends formed in a straight line, and the other is formed in a spiral shape. It is desirable to provide a temperature detecting means on the surface of the glass tube around the linear portion of the heater wire. In this case, when the temperature detecting means detects a predetermined temperature or more, the input of the heater wire is cut off, so that the defrosting means cuts off the input to further suppress the temperature rise above the ignition temperature of the flammable refrigerant. Furthermore, a straight line is drawn to the surface of the glass tube around the spiral part of the heater. Since the glass surface temperature at the outer periphery of the part is low, temperature detection means for detecting the temperature at a low level can be used, and the cost is low.
- the temperature detecting means performs the shut-off operation at a temperature lower by 310 ° C. to 410 ° C. than the ignition temperature of the flammable refrigerant. Then, when the heater wire rises to a temperature close to the ignition temperature of the flammable refrigerant, the temperature detecting means detects the temperature at a temperature lower by 310 ° C to 410 ° C than the ignition temperature of the flammable refrigerant. Detect and shut off the input to the defrosting means. For this reason, the temperature rise above the ignition temperature of the flammable refrigerant can be further suppressed, and the temperature detection means can be of a relatively low temperature type and can be inexpensive.
- the defrosting means includes a glass tube and a heater wire made of a metal resistor inside the glass tube, and the heater wire is made up of a linear portion having both ends linear, and a spiral portion having the other ends spiral.
- the calorific value per unit area obtained by dividing the calorific value of the spiral part due to Joule heat by the surface area of the inner surface of the glass tube is less than a predetermined value.
- the amount of heat generated by the Joule heat of the spiral part and 1 ⁇ 6 WZ cm less than 2 the heating value per divided ivy unit area in the table area of the glass tube surface Joule heat from the heater itself from the glass tube
- the surface temperature of the heater wire is reduced, the defrosting ability and the service life of the same level or higher can be secured, and the surface temperature of the heater wire can be kept below the ignition temperature of the flammable refrigerant.
- the amount of heat generated per surface area of the glass tube surface 1 Knowing Joule heat of the heater wire to be used.
- a conventional equal or defrosting The design is easy because the temperature can be lower than the ignition temperature of the flammable refrigerant while ensuring the performance and life.
- the clearance between the inner surface of the glass tube and the heater wire be 1 mm or less, whereby the inhibition of heat transfer by gas between the glass tube and the heater wire can be reduced, and the gas is smoothly discharged from the heater wire.
- the heat dissipates outside through the glass tube.
- the amount of heat released to the outside increases, the defrosting ability improves, and the amount of heat released to the outside increases.
- the amount of heat used to raise the heating temperature of the heater wire decreases, so that the surface temperature of the heater wire decreases and becomes lower than the ignition temperature of the flammable refrigerant.
- the inner surface of the glass tube and the heater wire may be in contact with each other. In this case, there is no hindrance to heat transfer due to the gas between the glass tube and the heater line, and the heat released from the heater line smoothly passes through the glass tube. Dissipates heat to the outside through As a result, the amount of heat released to the outside is further increased, the defrosting ability is further improved, and the amount of heat released to the outside is increased, and the amount of heat used to increase the heating temperature of the heater is reduced.
- the surface temperature is lower and can be below the ignition temperature of the flammable refrigerant.
- a roof located above the glass tube may be provided, and the shortest distance between the outer surface of the glass tube and the roof may be a predetermined value or more.
- the roof it is possible to reduce the roof from hindering the convection of the gas near the glass tube, to improve the heat radiation due to the convection from the glass tube, and to improve the heat radiation along the heater, which is the heat receiving source of the glass tube.
- the surface temperature of the heater line decreases, and becomes lower than the ignition temperature of the flammable refrigerant.
- the thickness of the glass tube is desirably 1.5 mm or less. This increases the amount of heat transfer when the inner surface of the glass tube transfers the heat received from the heater wire to the outer surface of the glass tube, and the heat released from the heater wire smoothly radiates to the outside through the glass tube. As a result, the amount of heat released to the outside is further increased, the defrosting capacity is further improved, and the amount of heat released to the outside is reduced, so that the amount of heat used to increase the heating temperature of the heater wire is reduced.
- the surface temperature of the line becomes lower and becomes lower than the ignition temperature of the flammable refrigerant.
- the glass tube is made of quartz glass, breakage due to a difference in linear expansion when the temperature of the glass tube fluctuates due to heat generated by the heater wire can be prevented, and when the flammable refrigerant leaks into the atmosphere of the defrosting means. Direct contact between the heater wire and the leaked combustible refrigerant can be prevented.
- a refrigerator-freezer comprises: a refrigerator housing in which a freezer compartment and a refrigerator compartment are completely independent; a refrigerator, a refrigerator, a refrigerator having a high evaporation temperature for refrigeration; High evaporating temperature decompression mechanism with low decompression for high evaporating temperature, freezing room cooler with low evaporating temperature for freezing connected in parallel with the refrigerator cooler, large decompression for low evaporating temperature , Low evaporating temperature decompression mechanism, the refrigerator cooler and freezer cooler
- a refrigeration system in which a flammable refrigerant is sealed by operatively connecting a switching valve that controls the refrigerant to not flow to the refrigerator and a check valve that prevents the refrigerant from flowing back to the outlet of the freezer compartment cooler.
- It comprises a system and defrosting means for defrosting the freezer compartment cooler. Since the defrosting means performs defrosting at a temperature lower than the ignition temperature of the flammable refrigerant, all the rooms including the conventional freezing room and refrigeration room are cooled by one cooler, whereas the freezing room of the present invention is cooled. Since the cooler cools only the freezer compartment, the amount of frost formed in the freezer compartment cooler is reduced. Defrosting means can be used.
- the temperature can be reduced by using the defrosting means having a low calorific value and the power is low, and the defrosting means can perform defrosting at a temperature lower than the ignition temperature of the flammable refrigerant and save energy.
- the defrosting means it is desirable to comprise a glass tube, a heater wire made of a metal resistor inside the glass tube, and a roof located above the glass tube.
- the roof is composed of inclined plates which are inclined in opposite directions to each other, and the respective inclined plates are vertically separated from each other, so that the surrounding air which is heated by the heat generated by the defrosting means and rises by convection flows between the inclined plates. Once formed, it passes through the center gap of the roof to the upper evaporator and promotes the heat dissipation of the defrosting means.
- the amount of heat released to the outside is further increased, the defrosting capacity is further improved, and the amount of heat released to the outside is reduced by the amount of heat used to raise the heating temperature of the heater wire of the defrosting means.
- the surface temperature of the heater wire drops further, and becomes lower than the ignition temperature of the combustible refrigerant.
- FIG. 1 is a schematic diagram showing a refrigerating system of a refrigerator according to a first embodiment of the present invention.
- FIG. 2 is a longitudinal sectional view of a main part of a refrigerator according to a second embodiment of the present invention.
- FIGS. 3 to 5 are schematic longitudinal sectional views of respective heaters as defrosting means used in the third to fifth embodiments of the present invention.
- FIG. 6 is a characteristic diagram of a main part of the heater according to the fifth embodiment of the present invention.
- FIG. 7 is a schematic vertical sectional view of a heater as a defrosting means used in a sixth embodiment of the present invention.
- FIG. 8 is a characteristic diagram of a heater according to the sixth embodiment of the present invention.
- FIG. 9 is a schematic longitudinal sectional view of a heater as a defrosting means used in a seventh embodiment of the present invention.
- FIG. 10 is a characteristic diagram of a heater according to the seventh embodiment of the present invention.
- FIGS. 11 and 12 are schematic longitudinal sectional views of respective heaters as defrosting means used in the eighth and ninth embodiments of the present invention.
- FIGS. 13 to 17 are wiring diagrams of respective heaters in the tenth to fourteenth embodiments of the present invention.
- FIG. 18 and FIG. 19 are schematic longitudinal sectional views of respective heaters in the fifteenth and sixteenth embodiments of the present invention.
- FIG. 20 is a schematic vertical sectional view of a heater according to the seventeenth and eighteenth embodiments of the present invention.
- FIG. 21 is a schematic vertical sectional view of a heater according to the ninth and twenty-first embodiments of the present invention.
- FIG. 22 is a characteristic diagram of a heater according to the twenty-second embodiment 20 of the present invention.
- FIGS. 23 to 25 are schematic longitudinal sectional views of respective heaters according to the 21st to 23rd embodiments of the present invention.
- FIG. 26 is a schematic end sectional view of a heater according to the twenty-third embodiment of the present invention.
- FIG. 27 is a schematic vertical sectional view of a heater according to the twenty-fourth and twenty-fifth embodiments of the present invention.
- FIG. 28 is a schematic diagram showing a refrigeration system according to a 26th embodiment of the present invention.
- FIG. 29 is a schematic longitudinal sectional view of a refrigerator in a 26th embodiment of the present invention.
- FIG. 30 is a schematic longitudinal sectional view showing a part of a defrosting unit according to a twenty-seventh embodiment of the present invention.
- Fig. 31 is a schematic vertical sectional view of the upper part of a conventional refrigerator-freezer.
- the “heating temperature” (or simply “temperature”) of the defrosting means or the heater wire refers to the heat when the defrosting means or the heater wire is electrically operated and is excited to emit a heat ray. —Means the temperature of the tar wire.
- reference numeral 18 denotes defrosting means for defrosting frost attached to the evaporator 10;
- Reference numeral 9 denotes a compressor
- reference numeral 20 denotes a condenser
- reference numeral 21 denotes a decompression mechanism.
- a refrigeration cycle in which the compressor 19, the condenser 20, the decompression mechanism 21 and the evaporator 10 are functionally connected in a ring.
- a flammable refrigerant (not shown) is sealed inside. This flammable refrigerant is composed mainly of propanebisobutane, and its ignition point is generally said to be 450 to 470 ° C.
- the refrigerator-freezer of this configuration operates as follows.
- the operation of the compressor 19 cools the evaporator 10 of the refrigeration cycle, and the evaporator 10 in which the air in the refrigerator is cooled by the fan 11 that operates simultaneously with the operation of the compressor 19, The cool air exchanged with the evaporator 10 is exhausted into the refrigerator. Then, the defrost means 18 is operated after an arbitrary operation time of the compressor 19 has elapsed.
- the defrosting means 18 By the operation of the defrosting means 18, the defrosting means 18 generates heat at a temperature lower than the ignition temperature of the combustible refrigerant used in the refrigeration cycle to defrost the evaporator 10. The completion of defrosting is detected by the non-detection means, and the defrosting means is stopped to prevent non-cooling in the refrigerator due to frost formation periodically. Therefore, even if the flammable refrigerant in the refrigeration cycle leaks into the refrigerator, the defrosting means 18 will not exceed the ignition temperature of the flammable refrigerant used in the refrigeration cycle. The danger of ignition is reduced because only the temperature is reached.
- 22 is a glass tube which is a component of the defrosting means 18, 23 is a heater wire made of a metal resistor inside the glass tube 22 which is a component of the defrosting means 18,
- Reference numeral 24 denotes a straight portion formed of a straight line at both ends of the heater wire 23, and reference numeral 25 denotes a portion other than the straight portion 24.
- the heater wire 23 is formed in a spiral shape so that the heater wire 23 can be stored in a predetermined length of the glass tube 22.
- the spiral portion 26 is a cap for preventing defrost water from entering the inside of the glass tube 20.
- the heater wire 23 becomes closer to the heaters adjacent to each other than the linear portion 24.
- the heating temperature of the spiral portion 25, which rises in temperature due to the influence of the wire 23, generates heat at a temperature lower than the ignition temperature of the flammable refrigerant. Therefore, the frost in the evaporator 10 melts into water and drops from the evaporator 10. Some of the dropped water does not drop directly into the glass tube 22 but falls directly from the roof 16 or cap 26 into the tub 13, and the rest drops directly into the tub 13, The water dropped on 3 is drained to the outside from the drain 14.
- 27 is a lead wire connected to both ends of the heater wire 23, and L is a spiral length of the spiral portion 25.
- the heater wire 23 is input through the lead wire 25 and generates heat.
- the temperature of the heater wire 23 is higher than that of the spiral part 25.
- the vicinity of the center indicated by LZ2 generates heat at a temperature lower than the ignition temperature of the flammable refrigerant, and defrosts the evaporator 10. .
- h is the height of the spiral portion 25. Therefore, during defrosting, the gas in the vicinity of the heater wire 23 is heated by the heat generated by the heater wire 23 and moves upward, so that the gas in the glass tube 22 has a higher temperature in the upper part than in the lower part. Become. Under the influence, since the heater wire 23 has a height h at the spiral portion 25, the upper portion of the spiral portion 25 has a high temperature. This high temperature heater wire 2 3 The surface temperature of the spiral part 25 generates heat at a temperature lower than the ignition temperature of the combustible refrigerant, and defrosts the evaporator 10.
- the upper part of the spiral part 25, which is relatively high in temperature with the heater wire 23, is set to a temperature lower than the ignition temperature of the flammable refrigerant to make it flammable. Even if defrosting is performed when the volatile refrigerant leaks into the atmosphere of the defrosting means 18, the risk of ignition can be further reduced.
- L is the length of the spiral portion 25.
- the horizontal axis represents the amount of Joule heat generated by the heater wire 23 existing within the length L of the spiral portion 25 and the heater wire 2 existing within the length L of the spiral portion 25.
- the calorific value per unit surface area divided by the surface area of (3), the horizontal axis shows the surface temperature of the heater wire (23).
- the defrosting means 18 generates an evaporator with a heating value of less than 2.5 WZ C m 2 per unit area of the heater wire 23 in a portion existing within the length L of the spiral portion 25. Defrost 10
- the surface temperature of the heater wire 23 increases as the calorific value per unit area of the spiral part 25 of the heater wire 23 increases, and the calorific value per unit area becomes 2.5 W / cm 2 . If it exceeds, the temperature becomes higher than the ignition temperature of the flammable refrigerant.
- the defrost means 1 8 This makes it possible to increase the total calorific value of the heater wire 23 while maintaining the temperature below the ignition temperature of the flammable refrigerant. Note that, in this embodiment, isobutane is used as the type of flammable refrigerant, but the same effect can be obtained if other flammable refrigerants do not have a large difference in ignition temperature from isobutane.
- the heating temperature of the heater wire 23 is set to be lower than the ignition temperature of isobutane.
- the ignition temperature of isobutane is about 460 ° C.
- the heat generation per unit area shall be 0.67 WZ cm 2 or less.
- D is the outer diameter of the spiral portion 25.
- the horizontal axis in FIG. 8 represents the amount of Joule heat generated by the heater wire 23 existing within the length L of the spiral portion 25 as a volume surrounded by the length L of the spiral portion 25 and the outer diameter D.
- the calorific value per unit volume divided by the vertical axis represents the surface temperature of the heater line 23.
- the defrosting means 18 calculates the heat value of the joule heat of the heater wire 23 existing within the length L of the spiral part 25 by the length L of the spiral part 25 and the outer diameter D. When the calorific value per unit volume divided by the volume enclosed by is less than 8.5 cm 3 , the evaporator 10 is defrosted.
- the surface temperature of the heater line 2 3 rises in accordance with the amount of heat generated per unit volume of the spiral part 2 5 increases, the amount of heat generated per unit volume 8.
- the outer diameter D of the scan Pairaru portion is changed also, be designed as heating value to the volume calculated from the outer diameter D and length L of the spiral part 2 5 is less than 8.
- the heater wire 23 can be set at a temperature lower than the ignition temperature of the flammable refrigerant without affecting the outer diameter D of the spiral portion 25 of the heater wire 23, the defrosting means 1
- the design can be made easier, and the outer diameter D of the spiral portion 25 and the total calorific value of the heater line 23 can be freely changed while maintaining the ignition temperature of the flammable refrigerant below the ignition temperature.
- isobutane is used as the type of flammable refrigerant, but the same effect can be obtained if other flammable refrigerants do not have a large difference in ignition temperature from isobutane.
- P is the pitch of the spiral portion 25.
- Q on the horizontal axis in Fig. 10 is the heat value per unit surface area obtained by dividing the heat value of Joule heat of the heater wire 23 existing within the length L of the spiral portion 25 by its surface area, and the pitch
- the calorific value is obtained by dividing P by the coefficient obtained by dividing the outer diameter D, and the vertical axis represents the surface temperature of the heater wire 23. The operation of the refrigerator having such a configuration will be described below.
- the defrosting means 18 defrosts the evaporator 10 when the calorific value Q is less than 9.2 WZ cm 2 .
- the surface temperature of the heater wire 23 increases as the calorific value Q increases, and when the calorific value Q exceeds 9.2 WZ cm 2 , the temperature becomes higher than the ignition temperature of the flammable refrigerant. From this, it is possible to keep the heater line 23 below the ignition temperature of the flammable refrigerant while securing the same or higher defrosting ability and life as before, and if the flammable refrigerant leaks into the atmosphere of the defrosting means 18 Even if defrosting is performed, the risk of ignition can be further reduced.
- the heat generation amount Q is designed to be less than 9.2 WZ c ⁇ 2 so that the pitch diameter of the spiral portion 25 changes.
- the heater line 23 can be lower than the ignition temperature of the flammable refrigerant without affecting the flammable refrigerant, the defrosting means 18 can be more easily designed to be lower than the ignition temperature of the flammable refrigerant, and it is easier to design the defroster than the ignition temperature of the flammable refrigerant. It is possible to freely change the pitch ⁇ diameter of the spiral part 25 and the total calorific value of the heater wire 23 while maintaining the above.
- isobutane is used as the type of flammable refrigerant, but the same effect can be obtained if other flammable refrigerants do not have a large difference in ignition temperature from isobutane.
- the pitch of spiral portion 25 is 2 mm.
- the spiral portion 25 is connected to the adjacent heater wire 2.
- each part of the spiral part 25 The heating temperature varies depending on the pitch at the time of processing, and the influence of adjacent lines changes.
- the pitch of the spiral portion 25 is 2 mm, the influence from the lines adjacent to each other is reduced, and the variation can be suppressed.
- the temperature variation due to the variation in the pitch of the spiral portion 25 can be reduced, so that the entire heater line 23 can be lower than the ignition temperature of the flammable refrigerant, and the flammable refrigerant leaks into the atmosphere of the defrosting means 18. Even if defrosting is performed, the risk of ignition can be reduced.
- the pitch is 2 mm, but if it is more than that, the same effect can be obtained.
- reference numeral 28 denotes a metal that melts at a predetermined temperature lower than the ignition temperature of the combustible refrigerant
- reference numeral 29 denotes a power supply.
- the surface temperature of the heater line 23 may be higher than the ignition temperature of the flammable refrigerant.
- the heater line 23 reaches a predetermined temperature lower than the ignition temperature of the flammable refrigerant, the temperature is transmitted to the metal 28, the metal 28 melts, and the power supply from the power supply 29 to the heater line 23 is cut off.
- the heater line 23 does not generate heat and the temperature decreases.
- reference numeral 30 denotes a thermal fuse made of metal that melts at a predetermined temperature lower than the ignition temperature of the flammable refrigerant.
- the surface temperature of the heater wire 23 may become higher than the ignition temperature of the flammable refrigerant.
- the temperature fuse 30 is melted and the input from the power supply 29 to the defrost means 18 is cut off. The heating temperature of the defrosting means 18 does not rise.
- the heater wire 23 is prevented from rising above the ignition temperature of the flammable refrigerant, and even if the flammable refrigerant leaks into the atmosphere of the defrosting means 18, there is a risk of ignition even if defrosting is performed.
- Temperature fuse 30 may be damaged by some effect, and defrost means If there is no problem with 18, maintenance is easy because only the thermal fuse 30 needs to be replaced.
- reference numeral 30 denotes a thermal fuse made of metal that melts at a predetermined temperature lower than the ignition temperature of the flammable refrigerant. The operation of the refrigerator having such a configuration will be described below.
- a temperature fuse 30 is closely attached to an outer portion of the defrosting means 18 which is a part that comes into contact with gas in the refrigerator.
- the surface temperature of the heater wire 23 may be higher than the ignition temperature of the flammable refrigerant.
- the heat is transmitted to the closely mounted temperature fuse 30 satisfactorily, and the temperature of the temperature fuse 30 is ignited by the flammable refrigerant. It melts at a predetermined temperature below the temperature, becomes a liquid and drops. Then, the input to the defrost means 18 is cut off at the temperature fuse 30 part, and the temperature rise of the defrost means 18 is stopped.
- the temperature of the portion of the defrosting means 18 that comes into contact with the gas in the refrigerator can be more accurately transmitted to the temperature fuse 30, so that the defrosting means 18 becomes the ignition temperature of the combustible refrigerant.
- the temperature rise can be suppressed more accurately before, and if the flammable refrigerant leaks into the atmosphere of the defrosting means 18, the risk of ignition can be reduced even if defrosting is performed, and defrosting can be performed.
- the maintenance of the thermal fuse 30 when the means 18 has no problem is easy.
- the thermal fuse 30 is installed on the upper part of the outer periphery of the defrosting means 18.
- the defrosting means 18 When the defrosting means 18 is operated, the gas near the outer shell is heated by the heat generated by the defrosting means 18 and moves upward, so that the upper part of the defrosting means 18 is higher in temperature than the lower part. Then, when a high voltage is applied due to the voltage fluctuation, the surface temperature of the heater wire 23 may become higher than the ignition temperature of the flammable refrigerant.
- the temperature fuse 30 operates by detecting the temperature of the upper part, which is a high-temperature part, in the vertical direction of the defrosting means 18, and the ignition temperature of the entire combustible refrigerant of the defrosting means 18. The above temperature rise can be further suppressed, and if the flammable refrigerant leaks into the atmosphere of the defrosting means 18, the risk of ignition can be reduced even if defrosting is performed, and there is a problem with the defrosting means 18. Easy maintenance of thermal fuse 30 when not present.
- the temperature fuse 30 is installed at the lower part of the outer periphery of the defrosting means 18.
- the frost melted from the evaporator 10 etc. above the defrosting means 18 becomes defrost water, part of which is dropped on the defrosting means 18 and others are dropped on the tub 13 directly. I do.
- the defrost water dropped on the defrosting means 18 contacts the upper part of the defrosting means 18 and evaporates, and is rarely dropped on the thermal fuse 30 at the lower part of the defrosting means 18.
- the thermal fuse 30 is placed above the defrosting means 18. Since there is no temperature drop due to the direct contact of the defrosting water dripping from a certain evaporator 10, the heating temperature of the defrosting means 18 can be accurately detected, and the temperature rises above the ignition temperature of the defrosting means 18 The temperature can be controlled more accurately, and if the flammable refrigerant leaks into the atmosphere of the defrosting means 18, the risk of ignition can be reduced even if defrosting is performed, and there is no problem with the defrosting means 18 This has the effect that the maintenance of the thermal fuse 30 in such a case is easy.
- the thermal fuse 30 is installed on the outer periphery near the center L 2 of the length L of the defrosting means 18. Since both ends of the defrosting means 18 are in contact with the outside air, heat is exchanged with the outside air and the temperature is lower than the center, so that the center of the defrosting means 18 is a high temperature section. When a high voltage is applied due to the voltage fluctuation, the surface temperature of the heater wire 23 may become higher than the ignition temperature of the flammable refrigerant.
- the thermal fuse 30 operates by detecting the heating temperature of the central portion which is a high temperature portion in the length direction of the defrosting means 18, so that the flammable refrigerant of the entire defrosting means 18 is removed. If the flammable refrigerant leaks into the atmosphere of the defrosting means 18 even if defrosting is performed, the risk of ignition can be further reduced, and the defrosting means 18 When there is no problem, maintenance of the thermal fuse 30 is easy.
- the thermal fuse 30 blows at a temperature 100 ° C. to 200 ° C. lower than the ignition temperature of the flammable refrigerant to be used.
- the surface temperature of the heater wire 23 may be higher than the ignition temperature of the flammable refrigerant.
- the heater wire 23, which is a heating element reaches a predetermined temperature which is near the ignition temperature of the flammable refrigerant and lower than the ignition temperature, the surface of the glass tube 22 around the heater wire 23 becomes: Due to the heat taken when the heat is transferred from the heater line 23 to the glass tube 22, the temperature is lowered by 200 ° C. from the predetermined temperature of 100 ° C. Then, the temperature fuse 30 closely attached to the surface of the glass tube 22 is blown, and the input to the heater wire 23 is cut off, thereby suppressing the temperature rise.
- the temperature rise above the ignition temperature of the flammable refrigerant in the entire defrosting means 18 is more accurately suppressed. If the flammable refrigerant leaks into the atmosphere of the defrosting means 18, the risk of ignition can be reduced even if defrosting is performed, and the thermal fuse 30 when the defrosting means 18 has no problem Maintenance is easy.
- the thermal fuse 30 is installed on the surface of the glass tube 22 around the straight portion 24 of the heater wire 23, and is fixed to the glass tube 22 by a cap 26. Therefore, when the defrosting means is activated, the temperature of the heater wire 23 of the defrosting means 18 rises due to Joule heat, and the heat is transferred to the glass tube 22 on the outer periphery of the heater line 23 and the temperature of the glass tube 22 is increased. Also rises in correlation with the heater line 23. At this time, the linear portion 24 of the heater straight line 23 has a low temperature because the influence of the adjacent lines is small like the spiral portion 25, and the temperature of the linear portion 24 is also low in the glass tube 22. The temperature of the part on the outer periphery decreases.
- the heater wire is flammable When the temperature reaches a temperature lower than the ignition temperature of the reactive refrigerant, the temperature of the glass tube 22 around the straight section 24 is lower than the heating temperature of the heater line 23! / When the temperature reaches the predetermined temperature, the metal of the thermal fuse 30 melts, the power to the heater wire 23 is cut off, and the heating temperature of the heater wire 23 decreases.
- the defrosting means 18 can suppress the temperature rise before reaching the ignition temperature of the flammable refrigerant, and the defrosting is performed when the flammable refrigerant leaks into the atmosphere of the defrosting means 18.
- the risk of ignition can be reduced, and the maintenance of the thermal fuse 30 when the defrosting means 18 has no problem is easy.
- the thermal fuse 30 can be used to detect and operate a low temperature in a portion correlated with the heating temperature of the heater wire 23, and can be used at a lower cost than that for a high temperature.
- the temperature fuse 30 is installed in the cap 26 because the cap 26 also serves as a holder for the temperature fuse 30, but the heater wire 23 is a straight line. It is needless to say that the same effect can be obtained by installing on the surface of the glass tube 22 on the outer periphery of the portion.
- reference numeral 31 denotes a temperature detecting means.
- the temperature detecting means detects a predetermined temperature
- the power supply 29 cuts off the power supply to the heater wire 23 of the defrosting means 18. Therefore, when the defrosting means is activated, the temperature of the heater wire 23 of the defrosting means 18 rises due to Joule heat, and is transferred to the glass tube 22 on the outer periphery of the heater wire 23 to transfer the glass tube 22 Also rises in correlation with the heater wire 23.
- the straight portion 24 of the heater straight line 23 has a low temperature because the influence from the adjacent lines is small like the spiral portion 25, and the outer periphery of the straight portion 24 also becomes the glass tube 22. The temperature of the part where is lower.
- the detecting means 31 detects the predetermined temperature and cuts off the current to the heater line 23, and the heating temperature of the heater line 23 decreases.
- the defrosting means 18 can suppress the temperature rise before reaching the ignition temperature of the flammable refrigerant, and defrosting is performed when the flammable refrigerant leaks into the atmosphere of the defrosting means 18. Even if you do, the risk of ignition can be reduced. Further, the temperature detecting means 31 is capable of detecting a low temperature in a portion correlated with the heating temperature of the heater straight line 23, and can be used at a lower cost than that for the high temperature.
- the temperature detecting means is provided in the cap 26 since the cap 26 also serves as a holder for the temperature detecting means 31.
- the heater wire 23 is a straight line. It is needless to say that the same effect can be obtained if it is installed on the surface of the glass tube 22 on the outer periphery of the portion.
- reference numeral 31 denotes temperature detecting means.
- the temperature detecting means detects a temperature lower by 310 ° C. than the ignition temperature of the flammable refrigerant by 410 ° C. From 29, de-energize means 18 cut off the current to heater line 23. During operation of the defrosting means, the temperature of the heater line 23 of the defrosting means 18 rises due to Joule heat, and is transferred to the glass tube 22 on the outer periphery of the heater line 23 to reduce the temperature of the glass tube 22. It rises in correlation with the heater wire 23.
- the linear portion 24 of the heater wires 23 has a low temperature because the influence of the adjacent wires is small as in the spiral portion 25, and the temperature of the straight portion 24 also decreases in the glass tube 22.
- the temperature of the outer part decreases.
- the temperature detecting means 31 detects the temperature and cuts off the current to the heater wire 23, and the heating temperature of the heater wire 23 decreases without reaching the ignition temperature of the flammable refrigerant.
- the defrosting means 18 can accurately suppress the temperature rise before reaching the ignition temperature of the flammable refrigerant, and when the flammable refrigerant leaks into the atmosphere of the defrosting means 18, defrosting is performed. Even if it is performed, the risk of ignition can be reduced, and the temperature detection means 31 detects low temperature in a portion correlated with the heating temperature of the heater wire 23, so it is less expensive than high temperature use Things can be used.
- 32 is the inner surface of the glass tube 22
- 33 is the outer surface of the glass tube 22
- L is the length of the spiral portion 25.
- the heater wire 23 is energized through the lead wire 27, and the heater wire 23 generates heat by Joule heat.
- the defrosting means 18 defrosts the evaporator 10 when the Joule heating value per surface area of the glass tube inner surface 32 in the portion existing within the length L of the spiral portion 25 is less than a predetermined value.
- the surface temperature of the heater wire 23 increases as the heat generation per unit area, which is the Joule heat to the surface area of the glass tube inner surface 32, increases, and when the heat generation per unit area exceeds a predetermined value.
- the glass tube 22 is designed to have an area of the inner surface 32 of the glass tube that is suitable for the heat generation amount of the heater wire 23, the amount of heat radiated from the heater wire 23 to the outside through the glass tube 22 will be reduced.
- the heating temperature of the heater wire 23 increases as the defrosting ability decreases due to the decrease.
- the amount of heat transfer per unit area which is the Joule heat of the heater 23 with respect to the surface area of the inner surface 32 of the glass tube, is set to be less than a predetermined value.
- the area can be compensated for, and the temperature of the glass tube 22 that is correlated with the heating temperature of the heater wire 23 can be reduced while maintaining the same total amount of heat radiation from the glass tube 22 as before.
- the heater wire 23 can be set to a temperature lower than the ignition temperature of the flammable refrigerant while securing the same or higher defrosting performance and life as before, and the flammable refrigerant is removed when it leaks into the atmosphere of the defrost means 18. Even if frost occurs, the risk of ignition can be reduced. Furthermore, increasing the total heat value of the heater wire 23 raises the surface temperature of the heater wire 23, but the heat value per unit area of the inner surface 32 of the glass tube is determined even if the total heat value is increased.
- the heater wire 23 can be lower than the ignition temperature of the flammable refrigerant irrespective of the overall heating value of the heater wire 23, so that the ignition temperature of the flammable refrigerant is less than the ignition temperature.
- the defrosting means 18 can be easily designed, and the total heating value of the heater wires 23 can be increased while maintaining the temperature below the ignition temperature of the combustible refrigerant.
- the horizontal axis corresponds to the Joule heat generated within the length L of the spiral portion 25 within the length L of the spiral portion 25 within the length L of the spiral portion 25.
- the vertical axis is the surface temperature of the heater wire 23.
- the refrigerant in the refrigeration cycle is isobutane.
- the defrosting means 18 has an evaporator 1 having a Joule heat value per surface area of the glass tube inner surface 32 of a portion existing within the length L of the spiral portion 25 and less than 1.6 WZ cm 2 . Defrost 0.
- the surface temperature of the heater wire 23 increases as the amount of heat generated per unit area, which is Joule heat, relative to the surface area of the inner surface 32 of the glass tube increases, and the amount of heat generated per unit area increases by 1.6. If it exceeds WZ cm 2, it will be higher than the ignition temperature of the flammable refrigerant. In other words, unless the glass tube 22 is designed to have an area of the inner surface 32 of the glass tube that is suitable for the calorific value of the heater wire 23, the amount of heat radiated from the heater wire 23 to the outside through the glass tube 22 is required. As a result, the defrosting ability decreases, and the heating temperature of the heater wire 23 increases.
- the heat transfer per unit area which is the Joule heat of the heater 23 with respect to the surface area of the inner surface 32 of the glass tube, is set to less than 1.6 W / cm 2 , thereby reducing the heat transfer amount due to the temperature decrease of the glass tube 22.
- This can be compensated for by the heat transfer area, and the temperature of the glass tube 22 that is correlated with the heating temperature of the heater wire 23 can be reduced while maintaining the same total amount of heat radiation from the glass tube 22 as before.
- the heater wire 23 can be lower than the ignition temperature of the flammable refrigerant, and even if the flammable refrigerant leaks into the atmosphere of the defrosting means 18, the risk of ignition can be further reduced even if defrosting is performed. In addition, increasing the total heating value of the heater wire 23 raises the surface temperature of the heater line 23.
- the heater wire 23 can be set to a temperature lower than the ignition temperature of the flammable refrigerant regardless of the total heat value of the heater wire 23, so the ignition temperature of the flammable refrigerant
- the defrosting means 18 can be easily designed to have a temperature of less than 1, and the total heating value of the heater wire 23 can be increased while maintaining the ignition temperature of the combustible refrigerant below the ignition temperature.
- the heating temperature of the heater line 23 is set to be lower than the ignition temperature of isobutane.
- the heating temperature of the heater line 23 is It is necessary to keep the temperature below 360 ° C in consideration of the safety factor for the ignition temperature of about 460 ° C.
- the heat generation per surface area in the unit glass tube is 0.67 WZ cm 2 or less.
- 34 is the air inside the tube, which is the gas in the glass tube 22
- D is the outer diameter of the spiral part 25 of the heater wire 23
- d is the inner diameter of the glass tube 22.
- the distance between the outer peripheral portion of the spiral portion 25 of the heater line 23 and the inner surface 32 of the glass tube is 1 mm.
- the heat radiated from the surface of the heater wire 23 of the defrosting means 18 is a layer of air inside the pipe 34 having a low thermal conductivity between the heater line 23 and the inner surface of the glass tube 22. Then, heat is radiated to the outside from the outer surface of the glass tube 22 through the thickness of the glass tube 22. Therefore, by reducing the layer of air 34 in the tube with low thermal conductivity to 1 mm, heat transfer from the heater wire 23 to the inner surface 22 of the glass tube is promoted, heat dissipation to the outside is promoted, and defrosting is promoted. As the temperature advances, the surface temperature of the heater wire 23 decreases.
- the heater wire 23 can be kept below the ignition temperature of the flammable refrigerant while maintaining the same workability in manufacturing as before, and at the same time maintaining the same defrosting ability and service life as those of conventional flammable refrigerants. If the refrigerant leaks into the atmosphere of the defrosting means 18, even if defrosting is performed, the risk of ignition can be further reduced.
- the distance between the outer peripheral portion of the spiral portion 25 of the heater wire 23 and the inner surface 32 of the glass tube 22 is l mm.
- the gas in the glass tube 22 is air, but the same effect can be obtained if the heat conductivity is poor.
- the heating temperature of the heater wire 23 is set to be lower than the ignition temperature of the flammable refrigerant. Specifically, isobutane is used as the refrigerant, and the safety factor is set to prevent ignition.
- the Joule heat generation with respect to the surface area of the heater wire 23 is 0.67 WZ. cm 2 or less and the Joule heating value of the heater wire 23 to 0.67 W / cm 2 or less relative to the inner surface area of the glass tube, the heating temperature of the heater straight line 23 is more effectively reduced to 360 °. Can be less than C.
- the spiral portion 25 of the heater wire 23 is in contact with the inner surface 32 of the glass tube.
- part of the heat radiated from the surface of the heater wire 23 of the defrosting means 18 is transmitted to the glass tube 22 through a contact surface with the inner surface 32 of the glass tube, and the outer surface 3
- the heat is radiated to the outside from 3 and the other is radiated from the glass tube inner surface 32 through the inside of the glass tube 22 through the air 34 inside the glass tube 22 to the outside of the glass tube 33.
- the heat conduction of the glass tube 22 is much better than that of the air 34 inside the tube, the heat transfer is promoted by the contact between the heater wire 23 and the inner surface 32 of the glass tube. As a result, the amount of heat released increases the defrosting, and the heating temperature of the heater line 23 decreases.
- the heater wire 23 can be set to a temperature lower than the ignition temperature of the flammable refrigerant while securing the same or higher defrosting performance and life as before, and the flammable refrigerant is removed when it leaks into the atmosphere of the defrost means 18. Even if frost occurs, the risk of ignition can be reduced.
- the defrosting means 18 has a roof 16 above the glass tube 22 in which the heater wire 23 is installed, and the shape of the roof 16 is It has a U-shape, with the edges on both sides of the U-shape set to 35, and the U-shape opening is located below.
- J is the specified value of the dimension of the shortest distance between the roof 16 and the outer surface 33 of the glass tube, and the arrow indicates the path of convective air.
- the outer surface 33 of the glass tube is heated by the heat of the heater wire 23, transmitted to the surrounding air, and the temperature rises and moves upward by convection. .
- the inside of the U-shape of the roof 16 is filled, and the overflow moves from the rim 35 to the top of the roof 16 to defrost the evaporator 10 and its peripheral parts.
- the defrosted and liquefied water is dropped onto the top of the roof 16 and travels down the U-shaped edge 35 without dripping onto the glass tube 22. Drip below step 18.
- the temperature above the glass tube 22 rises because it is exposed to the high-temperature air in the U-shape of the roof 16, and the temperature above the heater wire 23 also rises.
- the heater wire 23 can be set to a temperature lower than the ignition temperature of the flammable refrigerant while securing the same or higher defrosting performance and life as before, and the flammable refrigerant is removed when it leaks into the atmosphere of the defrost means 18. Even if frost occurs, the risk of ignition can be reduced.
- the thickness of the glass tube 22 is set to 1.0 mm.
- the heat generated from the heater wire 23 is radiated from the inner surface 32 of the glass tube to the outside surface 33 of the glass tube through the thickness of the glass tube 22 to be defrosted.
- Means 18 Defrost the peripheral parts.
- the thickness of the glass tube 22 is l.O mm, the strength of the glass tube 22 is maintained while the heat transfer is promoted from the heater wire 23 through the glass tube 22 to promote the heat transfer. The amount of heat dissipation increases to promote defrosting, and the heating temperature of the heater line 23 decreases.
- the heater wire 23 can be set to a temperature lower than the ignition temperature of the flammable refrigerant while securing the same or higher defrosting performance and life as before, and the flammable refrigerant is removed when it leaks into the atmosphere of the defrost means 18. Even if frost occurs, the risk of ignition can be reduced.
- the thickness of the glass tube 22 is 1.0 mm, but if it is 1.5 mm or less, the same effect can be obtained although the degree of the defrosting effect is different.
- quartz is used as the material of the glass tube 22. If the defrosting means using such a quartz glass tube 22 is provided, the following advantages can be obtained.
- the refrigerant flows through the evaporator 10 to cool the freezing room 2 and the refrigerator 3 of the refrigerator housing 1, and the defrosting means 18 located around the evaporator 10 is used.
- the glass tube 22 has a minus temperature.
- the defrosting means 18 is activated.
- the heater wire 23 generates heat, the glass tube is heated, and the temperature becomes high in a short time, and the temperature of the glass tube 22 fluctuates by 300 to 450 ° C. in a short time.
- the conventional glass tube may be damaged due to a difference in linear expansion, and if the flammable refrigerant leaks into the atmosphere of the defrosting means 18 in the damaged state, the flammable refrigerant is converted to the flammable refrigerant when defrosting is performed. There is a risk of ignition.
- quartz glass is not damaged because of its small linear expansion due to temperature fluctuations, so if the flammable refrigerant leaks into the atmosphere of the defrosting means 18, even if defrosting is performed, more ignition will occur. Danger can be reduced.
- 36 is a refrigerator for the refrigerator compartment, which has a high evaporation temperature for refrigeration
- 37 is a decompression mechanism for the high evaporation temperature, which has a small amount of reduced pressure for the high evaporation temperature
- Is a refrigerator for a freezer compartment with a low evaporation temperature for freezing
- 39 is a low-evaporation-temperature decompression mechanism with a large amount of reduced pressure for the low-evaporation temperature
- 40 is a switching valve for switching the refrigerant flow path
- 41 is a refrigerant valve. This is a check valve for preventing the refrigerant from flowing back from the compressor 19 or the refrigerator cooler 36 to the freezer cooler 38.
- 4 2 is a refrigerator compartment fan for allowing the air in the refrigerator compartment 3 to pass through the refrigerator compartment cooler 3 6 to exchange heat and circulate the cooling air
- 4 3 is a refrigerator compartment cooler 3
- air for the refrigerator compartment 3 8 is a fan for the freezing room to circulate the cooling air by allowing the heat to pass through 8 and 4 to prevent the heat transfer from the cooler for the cold room 3 6 to the cold room 3.
- Refrigerator compartment wall which also serves as a duct for smooth ventilation
- Refrigeration compartment fan 3 Room discharge port 46 is a freezer compartment cooler partition wall that forms a duct for smooth ventilation of the freezer compartment cooler 38
- 47 is a freezer compartment fan operated by the freezer fan 43.
- 48 is a filter that is generated when the freezing room cooler 38 is defrosted. Water was stored is evaporating dish for automatically evaporated.
- the compressor 19 When cooling the refrigerator compartment 3, when the refrigerator compartment 3 reaches a certain set temperature or higher, the compressor 19 operates to start circulation of combustible refrigerant (not shown) in the refrigeration cycle, and the combustible refrigerant is condensed by the condenser. Condensed by heat exchange with outside air at 20 and decompression mechanism for high evaporation temperature by switching valve 40
- the refrigerant After passing through 37, the refrigerant flows to the refrigerator cooler 36, and is drawn into the compressor 19 to form a refrigerator room cooling cycle.
- the refrigerator compartment fan 42 operates simultaneously with the operation of the compressor 19, so that the air in the refrigerator compartment 3 is sucked in from the refrigerator compartment suction port 8 and is passed through the refrigerator compartment cooler 36 to exchange heat.
- the cooled air is discharged from the refrigerator compartment discharge port 45 to the refrigerator compartment 3 to cool the refrigerator compartment 3.
- the refrigerator compartment fan 42 is operated, and air having a temperature exceeding 0 ° C of the refrigerator compartment 3 flows through the refrigerator compartment cooler 36, and
- the frost formed on the refrigerator compartment cooler 36 by the ventilation air is defrosted by sublimation, and the air after passing through the refrigerator compartment cooler 36 has an increased absolute humidity and is discharged to the refrigerator compartment 3. Is done.
- the compressor 19 When cooling the freezer 2, when the freezer 2 reaches a certain set temperature or higher, the compressor 19 operates to start circulating the flammable refrigerant in the refrigeration cycle.
- the refrigerant is condensed by heat exchange with the refrigerant, passes through the low evaporating temperature depressurizing mechanism 39 via the switching valve 40, flows to the freezer cooler 38, and is sucked into the compressor 19 in the freezing room cooling cycle.
- the freezer compartment fan 43 operates simultaneously with the operation of the compressor 19 to draw air from the freezer compartment 2 through the freezer intake port 7 and to exchange heat with the freezer compartment cooler 38 for heat exchange.
- the cooled air is exhausted from the freezer compartment discharge port 47 to the freezer compartment 2 to cool the freezer compartment 2.
- the freezer compartment cooler 38 since the air passing through the freezer compartment cooler 38 is air only in the freezer compartment 2, the freezer compartment cooler 38 is small and has a small heat exchange area, so that the frost area is small and the The amount of frost is reduced.
- the defrosting means 18 operates at an arbitrary time while the compressor 19 is stopped or the refrigerator is being cooled, and defrosts the refrigerator 38 and its peripheral parts. At this time, the refrigerant in the piping of the freezer compartment cooler 38 is also heated. Then, the heated refrigerant evaporates in the freezer-room cooler 38 and moves to the low-temperature portion which is not heated by the defrosting means 18, and removes heat from the frost in that portion.
- the frost then melts, and the refrigerant condenses by removing heat from the frost. At this time, part of the condensed refrigerant remains in the freezer compartment cooler 38 and is again heated by the defrosting means 18. It is. By repeating this operation, the entire freezer compartment cooler is defrosted, and the defrosted water, which has been defrosted and becomes water, falls into the tub 13 and falls from the drain port 14 into the evaporating dish 48, where it is stored.
- the defrost water stored in the evaporation tray 48 is naturally evaporated by receiving heat generated during the operation of the compressor 19. As described above, since the freezer compartment cooler 38 cools only the freezer compartment 2, the amount of frost is small, so that the calorific value of the defrosting means 18 can be reduced. The temperature drops.
- the evaporator 10 which is the cooler
- a large amount of heat is required for heating by the defrosting means 18 during defrosting. Therefore, a large amount of heating of the refrigerant is required in addition to the amount of heat used for defrosting.
- the amount of the refrigerant in the refrigerator cooler 38 is much smaller than in the case of one conventional cooler. Energy can be saved because the amount of heat used for heating by defrosting means 18 other than defrosting during defrosting can be small.
- reference numeral 49 denotes one side of the roof 16, the upper force of the glass tube 22 ⁇ an upper swash plate inclined downward to the right side, and 50 denotes the other side of the roof 16.
- a lower swash plate that is inclined downward from the upper side of the glass tube 22 to the left and that is located below the upper swash plate 49 is shown.
- Reference numeral 51 denotes a gap between the upper swash plate 49 and the lower swash plate 50. Arrows indicate air paths around the defrosting means.
- the heater wire 23 of the defrosting means generates heat, and the temperature of the heater wire 23 and the glass tube 22 around the heater wire 23 rises. Then, the air in the vicinity of the glass tube 22 is heated and rises to the upper swash plate 49 and the lower swash plate 50 of the roof 16 as shown by the arrow, and a part of the air passes through the gap 51 and evaporates upward. It moves to the evaporator 10 and defrosts by exchanging heat with the frost adhering to the evaporator 10 and its surroundings. And defrosting The water dropped onto the upper swash plate 49 and the lower swash plate 50, and falls down along the upper swash plate 49 and the lower swash plate 50 without being directly dropped on the glass tube 22.
- the defrosting water does not drop directly onto the glass tube 22 of the defrosting means 18 as in the past, so the same life as the conventional one is secured, while the roof 16 without the conventional gap 51 is provided.
- the air heated by the defrosting means 18 can be smoothly moved to the evaporator 10, so that the amount of heat released to the outside is further increased, the defrosting ability is further improved, and the outside Since the amount of heat release increases, the amount of heat used to increase the heating temperature of the heater wire 23 of the defrosting means 18 decreases, so the surface temperature of the heater wire 23 further decreases and falls below the ignition temperature of the flammable refrigerant. can do.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Defrosting Systems (AREA)
- Resistance Heating (AREA)
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/979,047 US6684659B1 (en) | 1999-05-17 | 2000-05-15 | Refrigerator and defrosting heater |
EP00927765A EP1180653A4 (en) | 1999-05-17 | 2000-05-15 | REFRIGERATOR AND DEFROST HEATING DEVICE |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP11/135304 | 1999-05-17 | ||
JP11135304A JP2000329447A (ja) | 1999-05-17 | 1999-05-17 | 冷蔵庫および除霜用ヒーター |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2000070281A1 true WO2000070281A1 (fr) | 2000-11-23 |
Family
ID=15148594
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2000/003091 WO2000070281A1 (fr) | 1999-05-17 | 2000-05-15 | Refrigerateur et element chauffant degivreur |
Country Status (6)
Country | Link |
---|---|
US (1) | US6684659B1 (ja) |
EP (1) | EP1180653A4 (ja) |
JP (1) | JP2000329447A (ja) |
KR (1) | KR100459276B1 (ja) |
CN (1) | CN1152228C (ja) |
WO (1) | WO2000070281A1 (ja) |
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Also Published As
Publication number | Publication date |
---|---|
EP1180653A4 (en) | 2003-07-16 |
KR20020011409A (ko) | 2002-02-08 |
EP1180653A1 (en) | 2002-02-20 |
CN1152228C (zh) | 2004-06-02 |
US6684659B1 (en) | 2004-02-03 |
KR100459276B1 (ko) | 2004-12-03 |
CN1350628A (zh) | 2002-05-22 |
JP2000329447A (ja) | 2000-11-30 |
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