CN100439831C

CN100439831C - Refrigerator

Info

Publication number: CN100439831C
Application number: CNB2006101592929A
Authority: CN
Inventors: 中山干启; 岸中裕司; 山本清则; 横江章
Original assignee: Matsushita Refrigeration Co
Current assignee: Panasonic Holdings Corp
Priority date: 2001-03-13
Filing date: 2002-03-13
Publication date: 2008-12-03
Anticipated expiration: 2022-03-13
Also published as: JP2002267331A; CN1327177C; KR100600185B1; EP1369650B1; HK1075696A1; EP1369650A1; EP1793186A3; CN1620585A; EP1793186A2; CN1940419A; DE60232715D1; WO2002073106A1; EP1793186B1; CN1945177A; CN100513949C; EP1369650A4; TW539838B; KR20030094279A

Abstract

As a defrosting means for an evaporator having a combustible refrigerant sealed therein and included in a refrigerating cycle, a plurality of glass tube heaters are installed in the vicinity of the evaporator. And, the electricity passing time or the applied voltage is controlled such that the surface temperature of the glass tube heaters is less than the ignition temperature of the combustible refrigerant. Further, the glass tube heaters and the evaporator fins are brought into contact with each other to lower the surface temperature of the glass tube heaters. Further, the glass tube heaters are of multiple construction and a sealing member is installed on the end surface. With such arrangement, in a refrigerator using a combustible refrigerant, even if defrosting is effected in a combustible refrigerant-leaking environment, firing of the combustible refrigerant can be prevented and so can be non-cooling due to the residue of the frost.

Description

Refrigerator

To be the application number submitted on March 13rd, 2002 be " 02806570.0 ", denomination of invention dividing an application for the application for a patent for invention of " refrigerator " in patent application of the present invention.

Technical field

The present invention relates to use the defrosting of the refrigerator of combustible refrigerant.

Background technology

The flat 8-54172 communique of Japanese Patent Application Laid-Open is enumerated relevant for the refrigerator that uses existing combustible refrigerant.With reference to the above-mentioned existing refrigerator of description of drawings.Figure 31 be existing refrigerator want portion's longitudinal section.

Among Figure 31, have refrigerating chamber 2 and refrigerating chamber 3 in the inside of refrigerator body 1.Refrigerating chamber 2 and refrigerating chamber 3 are separated by compartment walls 6.Refrigerating chamber door 4 and refrigerating-chamber door 5 are installed respectively in refrigerating chamber 2, refrigerating chamber 3.The air that suction inlet 7 sucks in the refrigerating chamber 2.The air that suction inlet 8 sucks in the refrigerating chamber 3.Discharge opening 9 spues cold air in the refrigerating chamber 2.Fan 11 makes circulating cold air.Evaporimeter 10 is separated by compartment walls 12 with refrigerating chamber 2.Defrosting Glass tube heater 15 will weigh the coiled type thing that the evanohm line makes and be constituted by covering with glass tube.Roof 16 prevents that defrost water from directly dripping and be contacted with heater 15 and send the evaporation sound.Metal base plate 17 is insulated maintenance, is set between bucket 13 and the heater 15.Accumulator 18 is set at the export department of evaporimeter 10.

Below, be illustrated at the action of the existing refrigerator of above-mentioned structure.

Under the situation of cooling refrigerating chamber 2 and refrigerating chamber 3, cold-producing medium circulates in cooling evaporimeter 10 in the evaporimeter 10.Identical therewith running by fan 11, by suction inlet 7 with the intensification air of refrigerating chamber 2, the intensification air of refrigerating chamber 3 is delivered to cooling chamber 20 by suction inlet 8.And these intensification air, are delivered to cooling air in the refrigerating chamber 2 by discharge opening 9 by heat exchange and cooling by evaporimeter 10, in addition, by connected entrance (not shown) cold air are delivered to refrigerator by refrigerating chamber 2.At this, the air of doing heat exchange with evaporimeter 10 for the switch by refrigerating chamber door 4 and refrigerating-chamber door 5 flow into the high temperature ambient atmos, with by the evaporation of the moisture of the preservation food of refrigerating chamber 2 and refrigerating chamber 3 etc. by the air of high humidifying.For this reason, on evaporimeter 10 than this air low temperature, airborne moisture form the frost and frost.On the other hand, storage press 18 prevents to cool off lack of refrigerant in the running, or prevents that the liquid cold-producing medium from directly getting back to the compressor injury compressor, or prevents the mobile sound of cold-producing medium.

So, evaporimeter 10 frost back the frost amount and increase along with it, encumbered of the heat transfer of evaporimeter 10 surfaces with heat exchange air.In addition, the frost of frost forms the ventilation impedance, because air quantity reduction generation cooling is not enough.Thus by the heavy evanohm line that is energized to Glass tube heater 15,, be melted into water with near the discharge outlet 14 frost with being attached to evaporimeter 10 and bucket 13 by the heat ray of this place radiation.

In addition, so the part of the defrost water of melting directly drops down onto bucket 13, and other is then avoided heater 15 by roof 16 and drops down onto bucket 13, by discharge outlet 14 drainings to refrigerator.At this moment, be radiated to the part of bucket 13 hot line by heater 15, by base plate 17 specular scatterings to evaporimeter 10 directions.

But,, in the freeze cycle of using combustible refrigerant, have following problem at above-mentioned existing structure.That is, because the latent heat of combustible refrigerant is bigger, so the not enough residual frost of defrosting takes place in the pipe arrangement portion of the evaporimeter 10 that combustible refrigerant is detained.Its result takes place not cold because of its residual frost encumbers the heat conduction.

In addition, general, the heavy evanohm surface of heater 15 and the surface temperature of Glass tube heater are very high.Thereby, under the situation of combustible refrigerant, have the heat that takes place by heater and the problem of the danger of catching fire by the leakages such as pipe arrangement of evaporimeter 10.

Summary of the invention

Refrigerator of the present invention has solved above-mentioned problem, even and with provide a kind of have be provided with under the situation that takes place in the environment of defrost mechanism to leak at combustible refrigerant defrost, also can prevent catching fire of combustible refrigerant, can prevent that the refrigerator because of the not cold defroster of residual frost from being purpose simultaneously.

Refrigerator of the present invention has following structure.

It has, freeze cycle, and it is by the compressor that is linked in sequence, condenser, the mechanism of decompressor, form and the combustible refrigerant of packing into evaporimeter; And defroster, in order to above-mentioned evaporimeter is defrosted; Wherein, above-mentioned defroster is made of a plurality of Glass tube heater, and the outer wall of cooperation Glass tube heater is provided with bend in the lower surface of this fin.

By this structure, under the situation with Glass tube heater heating fumigators and evaporimeter periphery when defrosting, can make towards the input of each Glass tube heater less.Thus, the surface temperature of Glass tube heater can be remained in below the ignition temperature of combustible refrigerant.Further and since can efficiently heat frost amount than many parts, can defrost equably so have, promote defrosting efficiency and do not have the advantage of residual frost.

Description of drawings

Fig. 1 is the key diagram of freeze cycle of the refrigerator of the 1st embodiment of the present invention;

Fig. 2 be the 1st embodiment of the present invention refrigerator want portion's longitudinal section;

Fig. 3 be refrigerator shown in Figure 2 want portion's skeleton diagram;

Fig. 4 be refrigerator shown in Figure 2 Glass tube heater want the enlarged cross section figure of portion;

Fig. 5 be the 2nd embodiment of the present invention refrigerator want portion's longitudinal section;

Fig. 6 be the 3rd embodiment of the present invention refrigerator want portion's longitudinal section;

Fig. 7 be the 4th embodiment of the present invention refrigerator want portion's longitudinal section;

Fig. 8 be the 5th embodiment of the present invention refrigerator want portion's longitudinal section;

Fig. 9 be the 6th embodiment of the present invention refrigerator want portion's longitudinal section;

Figure 10 be the 7th embodiment of the present invention refrigerator want portion's longitudinal section;

Figure 11 be the 8th embodiment of the present invention refrigerator want portion's longitudinal section;

Figure 12 is the partial perspective view of the refrigerator of the 9th embodiment of the present invention;

Figure 13 is that B shown in Figure 12 is to front view;

Figure 14 is another evaporimeter of refrigerator of the 9th embodiment of the present invention and the partial perspective view of Glass tube heater;

Figure 15 is that C shown in Figure 14 is to front view;

Figure 16 is the evaporimeter of refrigerator of the 10th embodiment of the present invention and the partial perspective view of Glass tube heater;

Figure 17 is that D shown in Figure 16 is to front view;

Figure 18 is the evaporimeter of refrigerator of the 11st embodiment of the present invention and the partial perspective view of Glass tube heater;

Figure 19 is that E shown in Figure 180 is to front view;

Figure 20 is the evaporimeter of refrigerator of the 12nd embodiment of the present invention and the partial perspective view of Glass tube heater;

Figure 21 is that F shown in Figure 20 is to front view;

Figure 22 is the evaporimeter of refrigerator of the 13rd embodiment of the present invention and the partial perspective view of Glass tube heater;

Figure 23 is that G shown in Figure 22 is to front view;

Figure 24 is the expansion partial section of the Glass tube heater of refrigerator shown in Figure 22;

Figure 25 is the refrigeration cycle diagram of the refrigerator of the 14th embodiment of the present invention;

Figure 26 is the partial section of Glass tube heater of the refrigerator of the 14th embodiment of the present invention;

Figure 27 is the partial section of another Glass tube heater of the refrigerator of the 14th embodiment of the present invention;

Figure 28 is the partial section of Glass tube heater of the refrigerator of the 15th embodiment of the present invention;

Figure 29 is the partial section of Glass tube heater of the refrigerator of the 16th embodiment of the present invention;

Figure 30 is the partial section of the Glass tube heater of the 17th embodiment of the present invention;

Figure 31 be existing refrigerator want portion's longitudinal section.

Label declaration

10 evaporimeters; 25a, 26a, 27a the 1st Glass tube heater; 25b, 26b, 27b the 2nd Glass tube heater; 101 refrigerators; 108 evaporimeters; 19,19a, 19b Glass tube heater; 115 Glass tube heaters; 117,121,123,126 fin; 122,127 notch; 124,128,138 bends; 130 side plates; 132 shields; 136 long fin; 137 short fin; The Glass tube heater of 139 duplexs; 142 cover caps; 143 resistance wire heater; 201 freeze cycle; 202 compressors; 203 freezing machines; 205 capillary flexible pipes; 206 evaporimeters; 207 Glass tube heaters; 208,216,225,234,241 containment members; 209,217,226,237,242 interior pipe support portions; 210,218,227,238,243 outer tube support portions; 211,219,228,239,244 interior pipes; 212,220,229,240,245 outer tubes; 221,222,230,231,246,247 towers meet portion; 223,224,232,233,248,249 front end faces; Pipe supporting member in 235; 236 outer tube supporting members; 301 freeze cycle; 302 compressors; 303 freezing machines; 305 mechanisms of decompressor; 306 evaporimeters; 307 defrosters.

The specific embodiment

Below, at embodiments of the invention, use accompanying drawing to be illustrated.

(embodiment 1)

Fig. 1 is the key diagram of freeze cycle of the refrigerator of the 1st embodiment of the present invention, Fig. 2 be the 1st embodiment of the present invention refrigerator want portion's longitudinal section, Fig. 3 be refrigerator shown in Figure 2 want portion's skeleton diagram, Fig. 4 be refrigerator shown in Figure 2 Glass tube heater want the enlarged cross section figure of portion.

Among Fig. 1, freeze cycle 301 is made of with evaporimeter 306 compressor 302 that is linked in sequence, freezing machine 303, the mechanism of decompressor 305.In addition, at its freeze cycle 301 combustible refrigerant of packing into.Further, near evaporimeter 306, set defroster 307.

Use is had the structure of the concrete refrigerator of freeze cycle shown in Figure 1 by Fig. 2 to Fig. 4 explanation.

By among Fig. 2 to Fig. 4, the refrigerator of this 1st embodiment includes 2

Glass tube heater

19a, 19b as the concrete example of defroster shown in Figure 1.Its each heater for example is arranged to form helical form by formed heater wires such as nickel chromium triangles with metal material in glass tube shown in Figure 3 23.And this

heater

19a, 19b are disposed at the below of evaporimeter 10 side by side.One side's heater 19a is disposed at evaporimeter 10 the most the next pipe arrangement 21 near.Again, in aftermentioned, at each Glass tube heater 19a of general name, when 19b describes, narrated with Glass tube heater 19.

As shown in Figure 2, be provided with evaporimeter 10, fan 11, roof 16, Glass tube heater 19 etc. at cooling chamber 20.A pair of maintenance part 22 shown in Figure 3 is set at the two ends of heater 19, is fixed in integratedly on heater 19a and the 19b.

At as the refrigerator of the 1st embodiment of above structure its action is described.

Through after the certain hour, stop fan 11 in order to remove the frost that is attached to evaporimeter 10, and the cold-producing medium that stops in the evaporimeter 10 passes through.Thereafter, Glass tube heater 19 energisings are removed the frost that is attached to evaporimeter 10 by the heat that this heater 19 is taken place.Finishing checkout gear (not shown) by defrosting detects and to stop towards the energising of heater 19 after defrosting finishes and finish the defrosting action.

At this, because of the liquid that stops the combustible refrigerant in the evaporimeter 10 of fan 11 the most the next pipe arrangement 21 that is stranded in evaporimeter 10 by the volume of weight own.Thereafter, the running of the glass heater 19a by the 1st, the big combustible refrigerant that volume is stranded in the latent heat in the most the next pipe arrangement 21 evaporates in pipe arrangement.

At this moment, heater 19a since be positioned at the most the next pipe arrangement 21 near, so can promote to be stranded in the evaporation of combustible refrigerant of volume of pipe arrangement inside of the bottom of evaporimeter 10.So the combustible refrigerant of evaporation forms high-temperature gas and moves towards the pipe arrangement on the top of evaporimeter 10.The high-temperature gas of the combustible refrigerant that moves towards the pipe arrangement on the top of evaporimeter 10 is because the pipe arrangement on evaporimeter 10 tops is a low temperature because of frost, so by the liquefaction that is cooled of pipe arrangement and fin.The necessary heat that will liquefy this high-temperature gas defrosts towards the white heat release on evaporimeter 10 tops.At this moment, combustible refrigerant since latent heat bigger, so for liquefy will be bigger heat heat release to frost promote the defrosting.So, carry out the defrosting of evaporimeter 10 by the thermal siphon phenomenon.In addition, except thermal siphon defrosting, by from directly being heated of heater 19, the air of warm periphery formed convection current when the part of evaporimeter 10 and periphery and the frost of wall melted, and carried out all defrostings of evaporimeter 10.

On the other hand, the 2nd Glass tube heater 19b is owing to being configured in the below of evaporimeter 10 side by side with heater 19a, so compared with prior art can make towards the input of each Glass tube heater less.Thus, the surface temperature of Glass tube heater can remain on below the ignition temperature of combustible refrigerant, for example adopting under the situation of iso-butane as combustible refrigerant, can remain on below 460 ℃.The surface area of radiation usually and heater is proportional.Thereby, constitute heater 19 a plurality ofly, compare with individually constituting, so because surface area increases towards the heat transfer of evaporimeter 10 accelerates.Further, owing to can efficiently heat the more evaporimeter bottom of frost amount, the lifting defrosting efficiency that can defrost equably forms frostless remnants.

Thus, evaporimeter 10 and periphery thereof are by the thermal siphon effect of the combustible refrigerant in the pipe arrangement, and with directly being heated of a plurality of

heater

19a, 19b, evaporimeter 10 is all defrosted equably, and it is frostless residual that defrosting efficiency promotes formation.In addition, by set Glass tube heater (19a, 19b) a plurality ofly, the actuation time of each

heater

19a, 19b is by cripeturaization.Its fever time is by cripetura thus, and the surface temperature of

heater

19a, 19b more can be suppressed below the ignition temperature of combustible refrigerant reliably.Further, owing to constitute 2

Glass tube heater

19a, 19b integratedly with a pair of maintenance part, assembling also is easier to so structure becomes simple.

As mentioned above, the refrigerator in this 1st embodiment, by a plurality of Glass tube heaters being set as the defroster in order to evaporator defrost, the temperature in the time of can making energising in each Glass tube heater is reduced to the ignition temperature less than combustible refrigerant.That is, for example can simultaneously keep equal defrosting ability one side with prior art defrosts with the ignition temperature less than combustible refrigerant.Thereby, defrost even be provided with at combustible refrigerant under the situation that takes place in the environment of defrost mechanism to leak, also can prevent catching fire of combustible refrigerant, can prevent simultaneously because of residual frost not cold.

(embodiment 2)

Fig. 5 be the 2nd embodiment of the present invention refrigerator want portion's longitudinal section.

The difference of this 2nd embodiment and above-mentioned the 1st embodiment is as follows.

In Fig. 5, a plurality of Glass tube heaters is configured on the relative position of seizing evaporimeter 10 on both sides by the arms.That is, the 1st Glass tube heater 25a is set below evaporimeter 10, the 2nd Glass tube heater 25b is set on the top of evaporimeter 10 simultaneously.And, this heater 25b be arranged on accumulator 18 near.

At refrigerator its action is described as above structure.

As the explanation at the 1st embodiment, in when defrosting, the liquid of the combustible refrigerant in the evaporimeter 10 is by the delay of the volume of weight own and the most the next pipe arrangement 21 of evaporimeter 10.And by the running of heater 25a, near the refrigerant liquid the most the next pipe arrangement evaporates in pipe arrangement towards the pipe arrangement on the top of evaporimeter 10 and moves, and the high-temperature gas of the combustible refrigerant that moves towards the top pipe arrangement is by the liquefaction that is cooled of pipe arrangement and fin.To the liquefy white heat release on necessary heat 10 tops towards frost in evaporimeter of this high-temperature gas defrosts.And the cold-producing medium that is liquefied is got back to the most the next pipe arrangement 21 once again by repeating the thermal siphon phenomenon, removes all frosts of evaporimeter.

By the specification of evaporimeter 10, a part of combustible refrigerant that is stranded in except that depressor 18 returns less than the most the next pipe arrangement 21, last defrosting position when this delay part forms defrosting easily.In the case, by radiation from the heater 25b on the top that is arranged at evaporimeter 10, can cripetura its be detained the defrosting time of part.Its result carries out the defrosting of evaporimeter and periphery thereof more equably, so do not have frost residual owing to promote defrosting efficiency, further, also can save the energy so can finish defrosting by the action of the Glass tube heater of short time.

As the refrigerator of above the 2nd embodiment of the present invention, be the locating up and down of evaporimeter that is positioned at the relative position of seizing evaporimeter on both sides by the arms owing to make the allocation position of a plurality of glass tubes, so can be by the efficient heating fumigators of upper and lower surface.Less owing to the caloric value of each Glass tube heater being made, so surface temperature can be remained in below the ignition temperature of combustible refrigerant.Further, so because the lifting defrosting efficiency that can defrost equably also can be saved the energy.Further, also can remove the frost of the accumulator that is disposed at evaporimeter top reliably, form frostless remnants.Thereby, defrost even be provided with at combustible refrigerant under the situation that takes place in the environment of defrost mechanism to leak, also can prevent catching fire of combustible refrigerant, can prevent simultaneously because of frost residual not cold.

According to the specification of evaporimeter, also exist other parts to need most the situation of the time of cost defrosting, under this occasion, the configuration of the 2nd Glass tube heater is got final product in its vicinity.

Further,, also Glass tube heater can be set respectively, under this occasion, so the defrost water of evaporimeter 10 also can be omitted roof 16 owing to can directly not spoon glass tube 25a with respect to the fore-and-aft direction of evaporimeter.

(embodiment 3)

Fig. 6 be the 3rd embodiment of the present invention refrigerator want portion's longitudinal section.

The difference of this 3rd embodiment and the various embodiments described above is as follows.

In Fig. 6, the 1st Glass tube heater 26a is arranged at the below of evaporimeter 10, and the 2nd Glass tube heater 26b is set at the middle part of evaporimeter 10 simultaneously.

At refrigerator its action is described as above structure.

Switch on during defrosting and also switch in heater 26b simultaneously in heater 26a.The major part of the heating that is produced by the energising of heater 26a forms the direct heating fumigators 10 of radiant heat.In addition, rely on the heated air of heat transfer to form warm ascending air, move towards top along evaporimeter 10 from the glass tube surface of heater 26a.When it moves, the frost of the evaporimeter 10 that is attached to the evaporimeter 10 in the way is heated up.So evaporimeter 10 is by bottom being heated to the top order.And by the heater 26b at the middle part that is arranged at evaporimeter 10, middle part that can heating fumigators 10 is to the slower part of the intensification on top.

In addition, be arranged among the heater 26a of below of evaporimeter 10, the heat that makes progress in the radiant heat is heating fumigators 10 directly.On the other hand, downward heat is if touch bucket 13 just by reflection heating fumigators 10.In contrast to this, heater 26b is owing to be arranged at the middle part of evaporimeter 10, so by the direct heating fumigators 10 of above-below direction or fore-and-aft direction.Thereby the defrosting of evaporimeter is carried out equably owing to being exceedingly fast, so the surface temperature of Glass tube heater can be suppressed below the ignition temperature of combustible refrigerant.Its result defrosts even be provided with at combustible refrigerant under the situation that takes place in the environment of defrost mechanism to leak, and also can prevent catching fire of combustible refrigerant, can prevent simultaneously because of residual frost not cold.

(embodiment 4)

Fig. 7 be the 4th embodiment of the present invention refrigerator want portion's sectional view.

The difference of this 4th embodiment and the various embodiments described above is as follows.

In Fig. 7, the 1st Glass tube heater 27a is arranged at the below of evaporimeter 10, and on the other hand, the 2nd Glass tube heater 27b is arranged at the either party of the front and back of evaporimeter 10.For being set, heater 27b notch 28 is set in the part of the fin of evaporimeter 10.In addition, the capacity of heater 27a that is disposed at the below of evaporimeter 10 is set for also bigger than the heater 27b that is configured in than its top.

At refrigerator its action is described as above structure.

After when defrosting, being energized to heater 27a and heater 27b, defrost from the bottom of evaporimeter 10 by the heater 27a that is arranged at evaporimeter 10 belows.In evaporimeter 10, for the slower evaporator section that heats up, heat the frost that will be attached to evaporimeter 10 by the front or rear heater 27b that is arranged at evaporimeter 10 and remove efficiently by the thermal siphon effect.And, because will being disposed at the capacity of heater 27a of the below of evaporimeter 10, to set the heater 27b that matches well side placed on it for also big, can be to adhering to the reliably defrosting efficiently of the maximum evaporimeter bottom of frost, thereby, the defrosting of evaporimeter 10 is carried out equably owing to being exceedingly fast, so the surface temperature of

Glass tube heater

27a, 27b can be suppressed below the ignition temperature of combustible refrigerant.Its result defrosts even be provided with at combustible refrigerant under the situation that takes place in the environment of defrost mechanism to leak, and also can prevent catching fire of combustible refrigerant, can prevent simultaneously because of residual frost not cold.

In addition, notch 28 is set, is disposed at either party's the heater 27b of the front and back of evaporimeter 10 in the part of the fin of evaporimeter 10, owing to be equipped on this notch 28, so can reduce for the idle space that heater 27b is produced is set.

In addition, even be arranged at arbitrary place of the front and back of evaporimeter 10, the water that is attached to the frost thawing of evaporimeter 10 is difficult to drench heater 27b.Its result also has when the running of fan 11, there is no need newly to be provided with for heater 27b the advantage on the roof that forms the essential factor that encumbers wind path.

(embodiment 5)

Fig. 8 be the 5th embodiment of the present invention refrigerator want portion's expanded view.

The difference of this 5th embodiment and the various embodiments described above is as follows.

In Fig. 8, temperature sensor 29 detects the surface temperature of Glass tube heater 19.The voltage that control device 30ON/OFF controls this heater 19 applies.The inside of heater 19 is equipped with heater line 31.

At refrigerator its action is described as above structure.

When defrosting, be energized to the heater line 31 of heater 19 inside.And by the temperature sensor 29 and the control device 30 of the surface temperature that detects glass tube, the voltage of ON/OFF control heater 19 applies, and the one side control surface temperature that makes heater 19 simultaneously defrosts less than the ignition temperature of combustible refrigerant reliably.The crowd knows as combustible refrigerant R600a (iso-butane) etc., and its ignition temperature is 460 ℃, control conduction time, remains for example defrosting below 450 ℃ less than the ignition temperature of combustible refrigerant in the surface temperature with heater 19.

Thereby, under any reason, the variation in voltage that applies towards Glass tube heater uprises, or do not defrost to finish and detect and when forming sky and burning state, defrost even be provided with at combustible refrigerant under the situation that takes place to leak in the environment of defrost mechanism, also can prevent catching fire of combustible refrigerant.

(embodiment 6)

The refrigerator of Fig. 9 the 6th embodiment of the present invention want portion's expanded view.

The difference of this 6th embodiment and the various embodiments described above is as follows.

In Fig. 9, temperature sensor 29 detects the surface temperature of Glass tube heater 19.Control device 32 is control device of the height that applies voltage of this heater 19 of control.Be equipped with heater line 31 in the inside of heater 19.

At refrigerator its action is described as above structure.

When defrosting, be energized to the heater line 31 of heater 19 inside.And, by the temperature sensor 29 and the control device 30 of the surface temperature that detects glass tube, the height that applies voltage of control heater 19, the surface temperature of a control heater 19 simultaneously defrosts less than the ignition temperature of combustible refrigerant reliably.The crowd knows as combustible refrigerant R600a (iso-butane) etc., and its ignition temperature is 460 ℃, and control applies the height of voltage, remains for example defrosting below 450 ℃ less than the ignition temperature of combustible refrigerant in the surface temperature with heater 19.

Thereby, the variation in voltage that applies towards Glass tube heater under any reason uprises, or do not defrost and finish detection, when the formation sky burns state, defrost even be provided with at combustible refrigerant under the situation that takes place to leak in the environment of defrost mechanism, also can prevent catching fire of combustible refrigerant.Further, apply the height control of voltage, can make the variations in temperature of heater line less, owing to can prevent broken string, so the spark that takes place can prevent because of broken string the time catches fire.

(embodiment 7)

Figure 10 be the 7th embodiment of the present invention refrigerator want portion's sectional view.

In Figure 10, refrigerator body 101 includes: outer container 102, interior case 103, and the hard polyurethane foamed thermal insulating 104 of one filling foaming between its outer container 102 and interior case 103.Refrigerating chamber 105 is spaced by zoning wall 107 with refrigerating chamber 106.Evaporimeter 108 is installed in the back side of refrigerating chamber 106.Foamed polystyrene body 109 is equipped on evaporimeter 108 fronts, makes the room and refrigerating chamber 106 thermal insulation of taking in evaporimeter 108.The panelling 110 of shaping resin is installed in the outside of foamed polystyrene body 109.On this panelling 110, formed cold air blow-off outlet 111.Between the lower end surface of panelling 110 and interior case 103, cold air sucting inlet 112 is set.

Cold air stirs a district that is installed on panelling 110 with fan motor 113.The cold air that its fan motor 113 will be cooled at evaporimeter 108 spues towards the chamber (not shown) of refrigerating chamber 106 and other temperature band.Defrosting drip tray 114 is positioned at the below of evaporimeter 108.The top peristome of its drip tray 114 is than the bigger and opening of following facial contour of evaporimeter 108.Glass tube heater 115 is installed between evaporimeter 108 and the drip tray 114.The evaporation tube 116 and the fin 117 of evaporimeter 108 are fixed by being pressed into or riveting.

Evaporating pan 119 is equipped on the below of drip tray 114, is detained to drip in the defrost water of drip tray 114.Heat release pipe 120 is configured in the evaporating pan 119, makes the defrost water heating evaporation that is stranded in evaporating pan 119.And the outer wall of heater 115 makes to become the long-term structure that contacts with the end face of fin 117.Fin 117 is made of continuous continuous fin in above-below direction.In addition, the heater of heater 115 uses the Ni-Cr line with resistive conductor.

At the refrigerator of as above constructing its action is described.

Cold air in that evaporimeter 108 is cooled is spued by the cold air blow-off outlet by fan motor 113, does heat exchange in refrigerating chamber 106, gets back to evaporimeter 108 by cold air sucting inlet 112.Repeat this do action refrigerating chamber 106 is cooled to uniform temperature.In addition, the part of the cold air that is cooled at evaporimeter 108, by conduit and baffle plate (not shown) be sent to refrigerating chamber 105 or with other the chamber (not shown) of temperature band, it is cooled to uniform temperature.

And, along with the time through frost being attached on the evaporimeter 108 slowly, encumber the flowing of cold air by this frost before, regular be energized to heater 115 defrostings.Being situated between by the water that defrosted is stranded in evaporating pan 119 by drip tray 114, is evaporated by the heat of heat release pipe 120.

Yet, at the refrigerator of this 7th embodiment, the freeze cycle that forms at connection compressor, freezing machine, the mechanism of decompressor and the evaporimeter of the order combustible refrigerant of packing into.And, because heater 115 is contacted with the end of fin 108,, also add by having promoted defrosting efficiency from the heat conducting defrosting effect of heater 115 so defrost from the radiant heat of heater 115 except being used to.Meanwhile, rely on heat conducting exothermal effect, do not change the surface temperature reduction of the glass tube that just can make heater 115 from the caloric value of heater 115 fin 108.Thus, the surface temperature of heater 115 can be remained in below the ignition temperature (for example the ignition temperature of iso-butane is 460 ℃) of combustible refrigerant.Thereby, do not have the worry of catching fire just in case combustible refrigerant leak into Ku Nei.

In addition, be arranged at the fin 117 of evaporimeter 108, constituted by continuous continuous fin in above-below direction, so the heat conduction exothermal effect towards fin 117 is higher, promoted defrosting efficiency, further, do not change the surface temperature that caloric value just can reduce heater 115, can make it below ignition temperature that remains in combustible refrigerant.

In addition, the heater resistive conductor of heater 115 owing to used the Ni-Cr line, so even use heater line at low temperature, also do not produce Fe-Cr etc. in the fragility of 470 ℃ of heaters that front and back produced with resistive conductors, can prevent the broken string of heater line.

(embodiment 8)

Figure 11 be the 8th embodiment of the present invention refrigerator want portion's sectional view.

The difference of this 8th embodiment and above-mentioned the 7th embodiment is as follows.

This 8th embodiment is except that the structure of the 7th embodiment, and as shown in figure 11, a plurality of fin 121 have along the notch 122 of the semicircle shape of the outer wall of Glass tube heater 115.The outer wall Continuous Contact of 122 pairs of heaters 115 of its notch.

At refrigerator its action is described as above structure.

The action of this 8th embodiment except that the illustrated action of above-mentioned the 7th embodiment, notch 122 since Continuous Contact in the outer wall of heater 115, so its contact area increases heat conduction efficiency lifting.Thus, further promote defrosting effect.In addition, do not change caloric value and just can make the surface temperature of heater 115 lower, can make it below ignition temperature that remains in combustible refrigerant.

(embodiment 9)

Figure 12 is the partial perspective view of the refrigerator of the 9th embodiment of the present invention, Figure 13 is that B shown in Figure 12 is to front view, Figure 14 is another evaporimeter of refrigerator of the 9th embodiment of the present invention and the partial perspective view of Glass tube heater, and Figure 15 is that C shown in Figure 14 is to front view;

In Figure 12, each fin 123 has the bend 124 of the L type that forms in the fin bottom.Its each bend 124 is contacted with the outer wall of Glass tube heater 115.And, as shown in figure 13, between the section of bend 124 and adjacent fin, have gap 125.In addition, as shown in figure 14, have the notch 127 that forms semicircle shape along the outer wall of Glass tube heater 115, further, also can even have the structure of the bend 128 that bends to the L shape in the end of each fin 126.

At refrigerator its action is described as above structure.

In Figure 12 and Figure 13, each fin 123 is owing to the outer wall along heater 115 bends to L shaped shape, so the contact portion of each fin 123 and heater 115 forms wire, heat conduction efficiency is promoted.In addition, owing to have gap 125, the radiant heat from heater 115 can be reached the top at the end face of bend 124 and adjacent fin.

In Figure 14 and configuration example shown in Figure 15, has the notch 127 that forms semicircle shape along the outer wall of heater 115 in the end of each fin 126, owing to also have the bend 128 that bends to the L shape, so it is planar that the contact portion of each fin 123 and heater 115 forms, heat conduction efficiency is promoted.

Thereby the constant surface temperature of heater 115 that can make of caloric value is lower when further promoting defrosting effect, can make it below ignition temperature that remains in combustible refrigerant.

(embodiment 10)

Figure 16 is the evaporimeter of refrigerator of the 10th embodiment of the present invention and the partial perspective view of Glass tube heater, and Figure 17 is that D shown in Figure 16 is to front view.

In Figure 16 and Figure 17, the both ends of Glass tube heater 115 are fixing by fixed part 129.This fixed part 129 be arranged at by incision the evaporimeter side side plate 130 vertical flange 131 a part and form.And, at the state of fixed heater 115, constitute the end that makes each fin 117 and contact with the outer wall of heater 115 in fixed part 129.

At refrigerator its action is described as above structure.

When the both ends of fixed heater 115, fixed part 129 is owing to the part of the vertical flange 131 of the side plate 130 that is arranged at the evaporimeter side by incision forms, so heater 115 can not fall in the below.Yet, marked down the finishing of also unnecessary special fixed component during assembling.Simultaneously can be long-term keep contacting of heater 115 and each fin 117 with reliable size relationship, can guarantee that reliable underground heat conducts.Its result, defrosting effect promotes, and the constant surface temperature that just can reduce heater 115 of caloric value can remain in below the ignition temperature of combustible refrigerant simultaneously.

(embodiment 11)

Figure 18 is the evaporimeter of refrigerator of the 11st embodiment of the present invention and the partial perspective view of Glass tube heater, and Figure 19 is that E shown in Figure 180 is to front view.

Among Figure 18 and Figure 19, between evaporimeter 108 and Glass tube heater 115, shield 132 is set.And, be configured to make the top of shield 132 to contact with the lower end 133 of each fin 117.The two ends 134 of shield 132 are riveted on two ends fin 135 grades and are mounted integratedly.

At refrigerator its action is described as above structure.

After heater 115 was energized, the heat that heater 115 takes place reached shield 132.Because the lower end 133 of top and each fin 117 of shield 132 contacts, so can be situated between by shield 132 exothermic heat of heater 115 to fin 117.Thereby, do not change caloric value and just the surface temperature of heater 115 can be remained in below the ignition temperature of combustible refrigerant body.In addition, melt the defrost water that by evaporimeter 108 and drip to shield 132.By this shield 132, prevent from the defrost water of flash-pot 108 directly to drip to heater 115, can prevent the sound (for example sound) that defrost water is contacted with heater 115 and is produced when evaporating rapidly.

(embodiment 12)

Figure 20 is the evaporimeter of refrigerator of the 12nd embodiment of the present invention and the partial perspective view of Glass tube heater, and Figure 21 is that F shown in Figure 20 is to front view.

In Figure 20 and Figure 21, each long fin 136 has the L shaped bend 138 that forms in the fin bottom.Each bend 138 is contacted with the outer wall of Glass tube heater 115.It is also shorter than long fin 136 that each short fin 137 is set the lower surface for.The size a that 2 long fin are 136 sets for also bigger than the size of 137 of long fin 136 and short fin.

At refrigerator its action is described as above structure.

Each long fin 136 is owing to the outer wall along heater 115 bends to the L type, so the contact portion of each long fin 136 and heater 115 forms wire, can make by the heat conduction efficiency of heater 115 towards long fin 136 to promote.In addition, constitute the long fin 136 and the short fin 137 of evaporimeter, owing to size between the fin of below than the top big (a＞b), thus in the storehouse during circulating cold air towards evaporimeter frost be not partial to the bottom.Its result, frost, to be formed on evaporimeter equably all, can set long defrosting cycle.Thus, the desired consumption electric power measurer that can suppress to defrost has the advantage of saving the energy.

(embodiment 13)

Figure 22 is the evaporimeter of refrigerator of the 13rd embodiment of the present invention and the partial perspective view of Glass tube heater; Figure 23 is that G shown in Figure 22 is to front view.

By among Figure 22 to Figure 24, the Glass tube heater 139 of duplex is made of with outer tube 141 interior pipe 140.Every certain arranged spaced outer tube 141, has resistance wire heater 143 for the outer wall of interior pipe 140 in the inside of interior pipe 140.And the two ends of two pipes are kept certain size by cover cap 142 and are fixed integratedly.At this, the structure that the outer tube 141 of heater 139 and the lower end of each fin 117 contacted as the growth stage.

At refrigerator its action is described as above structure.

After heater 139 is energized,, send by the surface of outer tube 141 by outer tube 141 from interior pipe 140 Jie by the heat that resistance wire heater 143 is sent.At this moment, by the heat insulating function of interior pipe 140 with the space of outer tube 141, the surface temperature of outer tube 141 is also lower than interior pipe 140.Thereby defrosting effect promotes, and does not change the surface temperature that caloric value just can reduce heater 115 simultaneously, can make it below ignition temperature that remains in combustible refrigerant.In addition because the end face of heater 139 is fixing with integrally formed cover cap 142, so can be correct guarantee gap size in the dual glass tube, make its easy assembling when can make glass tube surface temperature uneven less.

(embodiment 14)

Figure 25 is the refrigeration cycle diagram of the refrigerator of the 14th embodiment of the present invention; Figure 26 is the partial section of Glass tube heater of the refrigerator of the 14th embodiment of the present invention.

In Figure 25, be linked in sequence capillary flexible pipe 205, the evaporimeter 206 of compressor, condenser 203, drying machine 204, the mechanism of decompressor of freeze cycle 201 constitutes.Enclose combustible refrigerant in inside.The Glass tube heater 207 of defroster is disposed at the below of evaporimeter 206, removes the frost that is attached to evaporimeter 206 termly.

In Figure 26, containment member 208 has with rubber component integrally formed interior pipe support portion 209 and outer tube support portion 210, supports respectively by the end of the formed interior pipe 211 of the glass tube of multiple structure and the end of outer tube 212.Heater line 213 is formed by the material of iron-chromium and nickel-chromium etc.The inside of interior pipe 211 of inwall in to(for) interior pipe 211 disposes every certain interval.Connecting portion 214 riveted joint heater line 213 and lead-in wire 215.And lead-in wire 215 is exported to the outside by the below, side or the bottom surface of containment member 208.

In addition, Figure 27 is the partial section of another Glass tube heater of the refrigerator of the 14th embodiment of the present invention.

In Figure 27, containment member 216 has with rubber component integrally formed interior pipe support portion 217 and outer tube support portion 218.Interior pipe support portion 217 is supported interior pipe 219 at interior pipe 219 and clinch 221 with length c overlap joint.Outer tube support portion 218 is supported outer tube 220 at outer tube 220 and clinch 222 with the length d overlap joint.And the front end face 224 of clinch 222 (I face) than the front end face 223 (H face) of clinch 221 in the outer part.

At refrigerator its action is described as above structure.

In order to remove the frost that is attached to evaporimeter 206 termly, after the heater wire 213 of Glass tube heater 207 was energized, the evaporimeter 206 above its heat is arrived by outer tube 212 by interior pipe 211 was removed the frost that is attached to this place.At this, heater 207 is made of the glass tube of multiple structure.The caloric value and the prior art of heater 207 are same, and by the air adiabatic effect of interior pipe 211 with the space of outer tube 212, the surface temperature of outer tube 212 can suppress the ignition temperature (for example, iso-butane is 460 ℃) in combustible refrigerant.

And, owing to be provided with containment member 208,, can correctly guarantee the gap size of glass tube so can determine the position of the glass tube of duplex reliably at the end face of glass tube, can make surface temperature uneven less of glass tube.And then, by the interior pipe support portion that is provided with integratedly at containment member 208 209 and outer tube support portion 210, can suppress the inflow of the ambient atmos in the glass tube, just in case the possibility that the combustible refrigerant leakage also can suppress to catch fire.

In addition, containment member 216 is owing to pipe support portion 217 and outer tube support portion 218 in forming, so can suppress cost, the size inequality in the time of can reducing to assemble simultaneously.Further, in interior pipe support portion 217 with outer tube support portion 218 owing to form clinch 221 and 222 respectively, so can suppress the inflow of the ambient atmos in the glass tube reliably in the outer wall end of glass tube.

In addition, because the front end face 224 (I face) of clinch 222 is made the front end face 223 (H face) that is positioned at than clinch 221 also in the outer part, be difficult to be hindered by outer tube support portion 218 by the radiant heat that interior pipe 219 radiated.Thus, can efficiently defrost, becoming towards the insertion of the outer tube 220 of containment member 216 has simultaneously promoted assembling easily.

Again, in the 14th embodiment, containment member is a rubber system, if but have stable on heating material and also can obtain same effect.

(embodiment 15)

Figure 28 is the partial section of Glass tube heater of the refrigerator of the 15th embodiment of the present invention.

In Figure 28, containment member 225 has with rubber component integrally formed interior pipe support portion 226 and outer tube support portion 227.Interior pipe support portion 226 is supported interior pipe 228 at interior pipe 228 and clinch 230 with length e overlap joint.Outer tube support portion 227 is supported outer tube 229 at outer tube 229 and clinch 231 with equal length e overlap joint.And the front end face 233 of clinch 231 (J face) is positioned at same plane (J face) with the front end face 232 of clinch 230.And interior pipe 228 is made same size with outer tube 229, and the glass tube end face is positioned at same plane (K face).

At refrigerator its action is described as above structure.

Glass tube heater is formed with outer tube 229 by interior pipe 228, makes the clinch front end face 233 of the outer tube support portion that makes containment member 225 and the clinch front end face 232 of interior pipe support portion and is positioned at same plane.That is and since in same lap belt sealed inner tube support portion 226 with outer tube support portion 227, so each pipe also can both be guaranteed sufficient lap belt e, the inside and outside sealing of glass tube becomes good.Thereby, owing to can suppress the inflow of the ambient atmos in the glass tube reliably, so just in case combustible refrigerant leaks the possibility that also can suppress to catch fire.In addition, because interior pipe 228 is made same size with outer tube 229, so the manufacturing process of glass tube can simplify, it is easy that the making of glass tube also becomes.

(embodiment 16)

Figure 29 is the partial section of Glass tube heater of the refrigerator of the 16th embodiment of the present invention.

Among Figure 29, containment member 234 is made of a plurality of supporting member.That is the branch body structure of pipe supporting member 235 and outer tube supporting member 236 in, containment member 234 adopts.The outer wall end of pipe 239 in the interior pipe support portion 237 of pipe supporting member 235 is supported in being arranged at.The outer wall end of outer tube 240 is supported in the outer tube support portion 238 that is arranged at outer tube supporting member 236.In addition, the part of the exterior contour of pipe supporting member 235 in 236 crimping of outer tube supporting member are embedded in.And interior pipe supporting member 235 is by the higher material formed thereby of hear resistance, and outer tube supporting member 236 is by being formed than the low material of interior pipe supporting member 235 hear resistances.

At refrigerator its action is described as above structure.

In containment member 234,,, increase the design freedom of containment member 234 so can adopt combination of different materials during fabrication owing to manage the branch body structure of supporting member 235 and outer tube supporting member 236 in adopting.

In addition, interior pipe supporting member 235 is by the high material formed thereby of hear resistance, outer tube supporting member 236 is because by than the low material formed thereby of interior pipe supporting member 235 hear resistances, so improved the reliability of containment member, reduce the use of the high material of the high hear resistance of cost simultaneously, thereby can reduce the cost of containment member.

(embodiment 17)

Figure 30 is the partial section of the Glass tube heater of the 17th embodiment of the present invention.

In Figure 30, containment member 241 is shaped integratedly by rubber component, pipe support portion 242 and outer tube support portion 243 in having.Interior pipe support portion 242 manages 244 in interior pipe 244 and clinch 246 support with length f overlap joint.Outer tube support portion 243 is supported outer tube 245 at interior pipe 245 and clinch 247 with length g overlap joint.And the front end face 249 of the clinch 247 of outer tube support portion 243 (M face) is positioned at than the front end face 248 (L face) of the clinch 246 of pipe support portion 242 also in the inner part.

At refrigerator its action is described as above structure.

Glass tube heater is owing to make the inboard of the clinch front end face 248 that is positioned at pipe support portion 242 with the clinch front end face 249 of outer tube support portion 243, so can guarantee the lap belt g of outer tube 245 fully, the inside and outside sealing of glass tube becomes good.Thereby, owing to can suppress reliably towards the inflow of the ambient atmos of glass tube, so just in case combustible refrigerant leaks the possibility that also can suppress to catch fire.

Further, because the lap belt f of the clinch 246 of interior pipe support portion 242 can be smaller, so interior pipe support portion 242 can lessly be subjected to the heat affecting from the radiation of heater line 213, the temperature that the glass tube energising time can suppress the interior pipe support portion that caused by radiant heat rises.Thereby, there is no need with your material of high temperature classification material, thereby can reduce cost as containment member 241.

The possibility of utilizing on the industry

Refrigerator of the present invention arranges a plurality of Glass tube heaters and follows as enclosing the freezing of combustible refrigerant The defroster of the evaporimeter of ring. And, control conduction time or apply voltage, make glass tube heating Device is less than the ignition temperature of combustible refrigerant. Thus, can prevent catching fire of combustible refrigerant, And then can prevent because of residual frost not cold. In addition, the fin of Glass tube heater and evaporimeter is connect Touch, reduce the surface temperature of Glass tube heater. In addition, Glass tube heater is made multiple structure, At end face containment member is set. Thus, even under the environment that combustible refrigerant leaks, defrost Also can prevent from catching fire.

Claims

1. a refrigerator has, and freeze cycle is by the compressor that is linked in sequence, condenser, the mechanism of decompressor, evaporimeter and form and the combustible refrigerant of packing into; Glass tube heater, be disposed at above-mentioned evaporimeter below; A plurality of fin are arranged in the above-mentioned evaporimeter, wherein, the outer wall of above-mentioned Glass tube heater are contacted with the lower surface of above-mentioned fin, and the outer wall of cooperation Glass tube heater is provided with bend in the lower surface of this fin.

2. refrigerator as claimed in claim 1 wherein, cooperates the outer wall of described Glass tube heater, comprises described bend, is provided with notch in the lower surface of this fin.

3. refrigerator as claimed in claim 1 or 2, wherein, the side plate of evaporimeter is fixed at the both ends of Glass tube heater.