What is Claimed is:
1. A waste treatment process, comprising the following steps.
(a) freezing a predetermined amount of waste to a freezing temperature of at least -150°F by providing a predetermined amount of liquefied nitrogen around the waste; (b) immediately transferring the frozen waste into a heated environment having a temperature of at least 150°F for a predetermined period of time;
(c) decomposing the frozen waste in the heated environment due to an instantaneous temperature difference of at least 300°F between the frozen waste and the heated environment; and (d) dehydrating water from the waste in the heated environment and removing the water formed m the heated environment so as to accelerating the decomposition of the waste; and
(e) forming a dehydrated powder substance.
2. A waste treatment process, as recited in claim 1, wherein, in said step (a), said waste is preferred to be frozen to -230°F to -270°F.
3. A waste treatment process, as recited in claim 1, wherein, in said step (b), while said frozen waste is transferred into said heated chamber, said frozen waste is preferred to remain at -230°F to -270°F.
4. A waste treatment process, as recited in claim 1 wherein, in said step (b), said heated environment is preferred to maintain at 160°F to 190°F.
5. A waste treatment process, as recited in claim 2 wherein, in said step (b), said heated environment is preferred to maintain at 160°F to 190°F.
6. A waste treatment process, as recited in claim 3 wherein, in said step (b), said heated environment is preferred to maintain at 160°F to 190°F. 7. A waste treatment process, as recited in claim 1, wherein, in said step (b), said frozen waste is preferably kept in said heated environment for at least 2.5 minutes.
8. A waste treatment process, as recited in claim 2, wherein, in said step (b), said frozen waste is preferably kept in said heated environment for at least 2.5 minutes.
9. A waste treatment process, as recited in claim 3, wherein, in said step (b), said frozen waste is preferably kept in said heated environment for at least 2.5 minutes.
10. A waste treatment process, as recited in claim 4, wherein, in said step (b), said frozen waste is preferably kept in said heated environment for at least 2.5 minutes.
11. A waste treatment process, as recited in claim 5, wherein, in said step (b), said frozen waste is preferably kept in said heated environment for at least 2.5 minutes.
12. A waste treatment process, as recited in claim 6, wherein, in said step (b), said frozen waste is preferably kept in said heated environment for at least 2.5 minutes. 13. A waste treatment process, as recited in any of the claims 1-12, wherein, before said step (a), said waste is preferable to be compressed and crashed into small pieces.
14. A waste treatment process, as recited in any of the claims 1-12, wherein, in said step (a), said waste is preferable to be encase inside a cooling chamber and said heated environment in said step (b) is a heated chamber. 15. A waste treatment process, as recited in claim 13, wherein, in said step (a), said waste is preferable to be encase inside a cooling chamber and said heated environment in said step (b) is a heated chamber.
16. A waste treatment process, as recited in any of the claims 1-12, after said step (a), further compnsing an additional exhausting step of exhausting all kinds of gas formed around said frozen waste inside said sealed cooling chamber to a filter unit.
17. A waste treatment process, as recited in claim 13, after said step (a), further comprising an additional exhausting step of exhausting all kinds of gas formed around said frozen waste inside said sealed cooling chamber to a filter unit.
18. A waste treatment process, as recited in claim 14, after said step (a), further comprising an additional exhausting step of exhausting all kinds of gas formed around said frozen waste inside said sealed cooling chamber to a filter unit.
19. A waste treatment process, as recited in claim 15, after said step (a), further compπsing an additional exhausting step of exhausting all kinds of gas formed around said frozen waste inside said sealed cooling chamber to a filter unit. 20. A waste treatment process, as recited in claim 16, after said exhausting step further compnsing a filtenng step of filteπng the gas exhausted from said cooling chamber by said filter unit for ensuring no harmful gas being output.
21. A waste treatment process, as recited in claim 17, after said exhausting step further comprising a filtering step of filtenng the gas exhausted from said cooling chamber by said filter unit for ensuπng no harmful gas being output.
22. A waste treatment process, as recited in claim 18, after said exhausting step further compπsing a filtenng step of filtering the gas exhausted from said cooling chamber by said filter unit for ensuπng no harmful gas being output.
23. A waste treatment process, as recited in claim 19, after said exhausting step further compπsing a filtenng step of filteπng the gas exhausted from said cooling chamber by said filter unit for ensuπng no harmful gas being output.
instantaneous temperature difference between said trozen waste and said heated environment is preferable 400°F to 460°F.
25. A waste treatment process, as recited in claim 14, wherein, in said step (a), said liquefied nitrogen is sprayed evenly around said waste inside said sealed and insulated cooling chamber.
26. A waste treatment process, as recited in claim 15, wherein, in said step (a), said liquefied nitrogen is sprayed evenly around said waste inside said sealed and insulated cooling chamber.
27. A waste treatment process, as recited in claim 18, wherein, in said step (a), said liquefied nitrogen is sprayed evenly around said waste inside said sealed and insulated cooling chamber.
28. A waste treatment process, as recited in claim 19. wherein, in said step (a), said liquefied nitrogen is sprayed evenly around said waste inside said sealed and insulated cooling chamber.
29. A waste treatment process, as recited in claim 20, wherein, in said step (a), said liquefied nitrogen is sprayed evenly around said waste inside said sealed and insulated cooling chamber.
30. A waste treatment process, as recited in claim 21, wherein, in said step (a), said liquefied nitrogen is sprayed evenly around said waste inside said sealed and insulated cooling chamber.
31. A waste treatment process, as recited in claim 22, wherein, in said step (a), said liquefied nitrogen is sprayed evenly around said waste inside said sealed and insulated cooling chamber. 32. A waste treatment process, as recited in claim 23, wherein, in said step (a), said liquefied nitrogen is sprayed evenly around said waste inside said sealed and insulated cooling chamber.
33. A waste treatment process, as recited in claim 25, wherein, in said step (a), said liquefied nitrogen is sprayed for 4 to 6 minutes each time. 34. A waste treatment process, as recited in claim 26, wherein, in said step (a), said liquefied nitrogen is sprayed for 4 to 6 minutes each time.
35. A waste treatment process, as recited in claim 27, wherein, in said step (a), said liquefied nitrogen is sprayed for 4 to 6 minutes each time.
36. A waste treatment process, as recited in claim 28, wherein, in said step (a), said liquefied nitrogen is sprayed for 4 to 6 minutes each time.
37. A waste treatment process, as recited in claim 29, wherein, in said step (a), said liquefied nitrogen is sprayed for 4 to 6 minutes each time.
38. A waste treatment process, as recited in claim 30, wherein, in said step (a), said liquefied nitrogen is sprayed for 4 to 6 minutes each time. 39. A waste treatment process, as recited in claim 31, wherein, in said step (a), said liquefied nitrogen is sprayed for 4 to 6 minutes each time.
40. A waste treatment process, as recited in claim 32, wherein, in said step (a), said liquefied nitrogen is sprayed for 4 to 6 minutes each time.
41. A waste treatment process, as recited in claim 14, wherein, in said exhausting step after said step (a), a gas outlet valve is provided on said cooling chamber, in which before said freezing step (a) completes, said gas outlet valve is opened for at least one time for 15 to 30 seconds, and then said gas in said cooling chamber is automatically sucked from said cooling chamber through said gas outlet valve due to a high pressure and temperature difference between said cooling chamber and outside, and that, after depressurizmg to atmospheric pressure, said exhausted gas from said cooling chamber is sent to said filter unit.
42. A waste treatment process, as recited in claim 15, wherein, in said exhausting step after said step (a), a gas outlet valve is provided on said cooling chamber, in which before said freezing step (a) completes, said gas outlet valve is opened for at least one time for 15 to 30 seconds, and then said gas in said cooling chamber is automatically sucked from said cooling chamber through said gas outlet valve due to a high pressure and temperature difference between said cooling chamber and outside, and that, after depressurizmg to atmospheric pressure, said exhausted gas from said cooling chamber is sent to said filter unit
43. A waste treatment process, as recited in claim 33, wherein, in said exhausting step after said step (a), a gas outlet valve is provided on said cooling chamber, in which before said freezing step (a) completes, said gas outlet valve is opened for at least one time for 15 to 30 seconds, and then said gas in said cooling chamber is automatically sucked from said cooling chamber through said gas outlet valve due to a high pressure and temperature difference between said cooling chamber and outside, and that, after depressuπzing to atmospheπc pressure, said exhausted gas from said cooling chamber is sent to said filter unit. 44. A waste treatment process, as recited in claim 34, wherein, in said exhausting step after said step (a), a gas oudet valve is provided on said cooling chamber, in which before said freezing step (a) completes, said gas outlet valve is opened for at least one time for 15 to 30 seconds, and then said gas in said cooling chamber is automatically sucked from said cooling chamber through said gas outlet valve due to a high pressure and temperature difference between said cooling chamber and outside, and that, after depressurizmg to atmospheric pressure, said exhausted gas from said cooling chamber is sent to said filter uni
45. A waste treatment process, as recited in claim 35, wherein, in said exhausting step after said step (a), a gas outlet valve is provided on said cooling chamber, in which before said freezing step (a) completes, said gas oudet valve is opened for at least one time
for 15 to 30 seconds, and then said gas in said cooling chamber is automatically sucked from said cooling chamber through said gas oudet valve due to a high pressure and temperature difference between said cooling chamber and outside, and that, after depressurizmg to atmospheric pressure, said exhausted gas from said cooling chamber is sent to said filter unit. 46. A waste treatment process, as recited in claim 36, wherein, in said exhausting step after said step (a), a gas outlet valve is provided on said cooling chamber, in which before said freezing step (a) completes, said gas oudet valve is opened for at least one time for 15 to 30 seconds, and then said gas in said cooling chamber is automatically sucked from said cooling chamber through said gas oudet valve due to a high pressure and temperature difference between said cooling chamber and outside, and that, after depressuπzing to atmospheric pressure, said exhausted gas from said cooling chamber is sent to said filter unit.
47. A waste treatment process, as recited in claim 37, wherein, in said exhausting step after said step (a), a gas oudet valve is provided on said cooling chamber, in which before said freezing step (a) completes, said gas oudet valve is opened for at least one time for 15 to 30 seconds, and then said gas in said cooling chamber is automatically sucked from said cooling chamber through said gas oudet valve due to a high pressure and temperature difference between said cooling chamber and outside, and that, after depressurizmg to atmospheric pressure, said exhausted gas from said cooling chamber is sent to said filter unit.
48. A waste treatment process, as recited m claim 38, wherein, in said exhausting step after said step (a), a gas oudet valve is provided on said cooling chamber, in which before said freezing step (a) completes, said gas oudet valve is opened for at least one time for 15 to 30 seconds, and then said gas in said cooling chamber is automatically sucked from said cooling chamber through said gas oudet valve due to a high pressure and temperature difference between said cooling chamber and outside, and that, after depressurizmg to atmospheric pressure, said exhausted gas from said cooling chamber is sent to said filter unit.
49. A waste treatment process, as recited in claim 39, wherein, in said exhausting step after said step (a), a gas outlet valve is provided on said cooling chamber, in which before said freezing step (a) completes, said gas oudet valve is opened for at least one time for 15 to 30 seconds, and then said gas in said cooling chamber is automatically sucked from said cooling chamber through said gas oudet valve due to a high pressure and temperature difference between said cooling chamber and outside, and that, after depressuπzing to atmospheπc pressure, said exhausted gas from said cooling chamber is sent to said filter unit.
50. A waste treatment process, as recited in claim 40, wherein, in said exhausting step after said step (a), a gas outiet valve is provided on said cooling chamber, in which before said freezing step (a) completes, said gas outiet valve is opened for at least one time for 15 to 30 seconds, and then said gas in said cooling chamber is automatically sucked from said cooling chamber through said gas outiet valve due to a high pressure and temperature difference between said cooling chamber and outside, and that, after depressuπzmg to atmospheric pressure, said exhausted gas from said cooling chamber is sent to said filter unit. 51 A waste treatment process, as recited in claim 14, wherein, in said step (d), said water is removed from said heated chamber by sucking through a water outiet provided
on said heated chamber.
52. A waste treatment process, as recited in claim 15, wherein, in said step (d), said water is removed from said heated chamber by sucking through a water outiet provided on said heated chamber. 53 A waste treatment process, as recited in claim 50, wherein, in said step (d), said water is removed from said heated chamber by sucking through a water outlet provided on said heated chamber.
54. A waste treatment process, as recited m claim 14, wherein, after said step (e), further compnsing a step of clearing said dehydrated powder substance from the heated chamber.
55. A waste treatment process, as recited in claim 15, wherein, after said step (e), further comprising a step of cleanng said dehydrated powder substance from the heated chamber.
56. A waste treatment process, as recited in claim 26, wherein, after said step (e), further compnsing a step of clearing said dehydrated powder substance from the heated chamber.
57. A waste treatment process, as recited in claim 32, wherein, after said step (e), further comprising a step of clearing said dehydrated powder substance from the heated chamber. 58. A waste treatment process, as recited in claim 40, wherein, after said step (e), further comprising a step of clearing said dehydrated powder substance from the heated chamber.
59. A waste treatment process, as recited in claim 50, wherein, after said step (e), further comprising a step of clearing said dehydrated powder substance from the heated chamber.
60. A waste treatment process, as recited in claim 51, wherein, after said step (e), further comprising a step of clearing said dehydrated powder substance from the heated chamber.
61. A waste treatment process, as recited in claim 53, wherein, after said step (e), further comprising a step of clearing said dehydrated powder substance from the heated chamber.
62. A waste treatment device, comprising: a housing having an upper cooling chamber and a lower heated chamber thereunder, wherein said cooling chamber has a gas outiet valve provided thereon and said heated chamber has a water outiet provided thereon;
a partition wall installed between said cooling chamber and said heated chamber so as to entirely insulate said cooling chamber and said heated chamber from heat conduction therebetween; an openable cover door sealedly installed to said cooling chamber, wherein said surrounding walls of said cooling chamber, said partition wall and said cover door defines a sealed receiving room for receiving a predetermined amount of waste therein; an injector, which is firmly installed on said cover door and connected to a liquefied nitrogen source, having an emitting head extended inside said cooling chamber for injecting said liquefied nitrogen around said waste inside said cooling chamber for freezing said waste to at least -150°F; a control means for ensuring said injector to spray liquefied nitrogen into said cooling chamber from said liquefied nitrogen source only when said cover door entirely and sealedly shuts off said cooling chamber; a filter unit for filtering gas generated around said waste when said liquefied nitrogen is sprayed around said waste mside said cooling chamber, wherem said gas is exhausted through said gas outlet valve and sent to said filter unit after depressurizmg; an actuating means for dπving said partition wall to open after said waste inside said cooling chamber is frozen by said liquefied nitrogen emitted from said emitting head of said injector, wherein when said frozen waste falls to said heated chamber, said actuating means drives said partition wall back to its isolating position to entirely isolate said cooling chamber and said heated chamber from heat conduction; a heat source for maintaining said heated chamber at a temperature of at least
150°F, wherein when said frozen waste is moved from said cooling chamber to said heated chamber, said frozen waste inside said heated chamber is decomposed to form a powder substance due to an instantaneous temperature difference of at least 300°F between said frozen waste and said heated chamber; and a water exhaust means for removing water content of said waste from said heated chamber so as to accelerating the decomposition of said waste in said heated chamber and reducing the size and weight of said waste. 63. A waste treatment device, as recited in claim 62, wherein a passage opening is formed between said cooling chamber and said heated chamber, said partition wall normally covenng said passage opening.
64. A waste treatment device, as recited in claim 63, wherein said housing divides a control room for installing said filter unit, said actuating means, said heat source, and said water exhaust means therein.
65. A waste treatment device, as recited in claim 62, wherein said partition wall has one side hinged to a side wall of said heated chamber, and that when said partition wall is driven to swing downwards, said passage opening between said cooling chamber and said
heated chamber is opened.
66. A waste treatment device, as recited in claim 64, wherein said partition wall has one side hinged to a side wall of said heated chamber, and that when said partition wall is driven to swing downwards, said passage opening between said cooling chamber and said heated chamber is opened.
67. A waste treatment device, as recited in claim 66, wherein a gasket is affixed on top of said partition wall so as to ensure no clearance occurred at said passage opening when said partition wall is closed.
68. A waste treatment device, as recited in any of the claims 62-67 , wherein said cover door is sealedly installed on top of said cooling chamber and is filled with insulation material, said cover door being hingedly connected to a rear side of housing, so that said cover door is capable of swinging upwardly to open said cooling chamber for inputting said waste into said cooling chamber, wherein when said liquefied nitrogen is spraying inside said cooling chamber, said cover door must be remained closed and locked. 69. A waste treatment device, as recited in any of the claims 62-67, wherem said liquefied nitrogen source comprises a liquefied nitrogen tank firmly mounted on a rear portion of said cover door, said liquefied nitrogen tank having a normally closed exit valve provided at a front end thereof, and that said injector compπses an injecting tube sealedh extended through said cover door and a delivery tube sealedly connected between a top end of said injecting tube and said control means, wherein said emitting head is provided at a bottom end of said injecting tube for spraying out said liquefied nitrogen.
70. A waste treatment device, as recited in claim 68, wherein said liquefied nitrogen source comprises a liquefied nitrogen tank firmly mounted on a rear portion of said cover door, said liquefied nitrogen tank having a normally closed exit valve provided at a front end thereof, and that said injector comprises an injecting tube sealedly extended through said cover door and a delivery tube sealedly connected between a top end of said injecting tube and said control means, wherein said emitting head is provided at a bottom end of said injecting tube for spraying out said liquefied nitrogen.
71. A waste treatment device, as recited in any of the claims 62-67, wherem said control means, which is installed on said cover door, compπses a solenoid valve connected between said delivery tube and said exit valve for opening said exit valve of said liquefied nitrogen tank when it is activated, a door sensor for detecting whether said cover door is closed or opened, and a control panel mounted on said housing for operating said waste treatment device, thereby when said door sensor detects that said cover door is in opened condition, said solenoid valve is ineffective even said solenoid valve is activated to open said exit valve of said liquefied nitrogen tank through said control panel.
72. A waste treatment device, as recited in claim 70, wherein said control means, which is installed on said cover door, compπses a solenoid valve connected between said delivery tube and said exit valve for opening said exit valve of said liquefied nitrogen tank when it is activated, a door sensor for detecting whether said cover door is closed or opened.
and a control panel mounted on said housing for operating said waste treatment device, thereby when said door sensor detects that said cover door is in opened condition, said solenoid valve is ineffective even said solenoid valve is activated to open said exit valve of said liquefied nitrogen tank through said control panel. 73. A waste treatment device, as recited in claim 72, wherein said cover door further comprises a means for loctang said closed cover door.
74. A waste treatment device, as recited in any of the claims 72-77, wherein said filter unit which comprises at least a filtering element, a depressuπzer provided thereon, and a transmitting gas duct connecting said gas outiet valve of said cooling chamber with said depressunzer of the filter unit, so that when said liquefied nitrogen is sprayed around said waste inside said cooling chamber, said gas generated around said waste is sucked through said gas outiet valve to said filter unit via said transmitting gas duct and said gas exhausted from said cooling chamber is depressuπzed by reducing to atmospheric pressure before entering said filter unit, wherein said filter unit filters all poison and harmful chemicals in said gas.
75. A waste treatment device, as recited in claim 72, wherem said filter unit which compπses at least a filteπng element, a depressurizer provided thereon, and a transmitting gas duct connecting said gas outiet valve of said cooling chamber with said depressunzer of the filter unit, so that when said liquefied nitrogen is sprayed around said waste inside said cooling chamber, said gas generated around said waste is sucked through said gas outiet valve to said filter unit via said transmitting gas duct and said gas exhausted from said cooling chamber is depressunzed by reducing to atmospheric pressure before enteπng said filter unit, wherein said filter unit filters all poison and harmful chemicals m said gas.
76. A waste treatment device, as recited in claim 73, wherem said filter unit which compπses at least a filtenng element, a depressuπzer provided thereon, and a transmitting gas duct connecting said gas outiet valve of said cooling chamber with said depressurizer of the filter unit, so that when said liquefied nitrogen is sprayed around said waste inside said cooling chamber, said gas generated around said waste is sucked through said gas outiet valve to said filter unit via said transmitting gas duct and said gas exhausted from said cooling chamber is depressuπzed by reducing to atmospheric pressure before entering said filter unit, wherein said filter unit filters all poison and harmful chemicals in said gas.
77. A waste treatment device, as recited in any of the claims 62-67, wherein said actuating means compπses a two-way motor and a transmission unit connected to said partition wall, in which a power output from said motor is transmitted through said transmission unit to drive said partition wall swinging down and up.
78. A waste treatment device, as recited in claim 75, wherein said actuating means compπses a two-way motor and a transmission unit connected to said partition wall, in which a power output from said motor is transmitted through said transmission unit to drive said partition wall swinging down and up.
79. A waste treatment device, as recited in claim 76, wherein said actuating means
comprises a two-way motor and a transmission unit connected to said partition wall, in which a power output from said motor is transmitted through said transmission unit to drive said partition wall swinging down and up.
80. A waste treatment device, as recited in any of the claims 62-67, wherem said heat source comprises at least a heater which is a UV or IR lamp mounted within a lamp box with a plurality of ventilating holes provided thereon for enhancing ventilation, wherem said heater is positioned close to a heating window provided on said heated chamber so as to transfer heat into said heated chamber through said heating window for maintaining said temperature of said heated chamber, and that said heat source further comprises a dissipating fan installed above said lamp box so as to help a residual heat m said lamp box to dissipate outside said housing.
81 A waste treatment device, as recited in claim 78, wherein said heat source compnses at least a heater which is a UV or IR lamp mounted within a lamp box with a plurality of ventilating holes provided thereon for enhancing ventilation, wherein said heater is positioned close to a heating window provided on said heated chamber so as to transfer heat into said heated chamber through said heating window for maintaining said temperature of said heated chamber, and that said heat source further compnses a dissipating fan installed above said lamp box so as to help a residual heat in said lamp box to dissipate outside said housing. 82. A waste treatment device, as recited in claim 79, wherein said heat source compπses at least a heater which is a UV or IR lamp mounted within a lamp box with a plurality of ventilating holes provided thereon for enhancing ventilation, wherein said heater is positioned close to a heating window provided on said heated chamber so as to transfer heat into said heated chamber through said heating window for maintaining said temperature of said heated chamber, and that said heat source further comprises a dissipating fan installed above said lamp box so as to help a residual heat in said lamp box to dissipate outside said housing.
83. A waste treatment device, as recited in any of the claims 62-67, wherein said water exhaust means comprises a water tank, a water exhaust pump and a water conduit connecting said water exhaust pump with said water outiet on said heated chamber and said water tank, therefore, duπng decomposing of said waste, said water exhaust pump is activated simultaneously to suck said water steam generated from said heating waste and said water content of said heating waste inside said heated chamber to said water tank through said water outlet, and that said powder substance is collected in a removable tray disposed inside said heated chamber.
84. A waste treatment device, as recited in claim 71, wherein said water exhaust means compπses a water tank, a water exhaust pump and a water conduit connecting said water exhaust pump with said water outiet on said heated chamber and said water tank, therefore, during decomposing of said waste, said water exhaust pump is activated simultaneously to suck said water steam generated from said heating waste and said water content of said heating waste inside said heated chamber to said water tank through said water outiet, and that said powder substance is collected m a removable tray disposed mside
said heated chamber.
85. A waste treatment device, as recited in claim 82, wherein said water exhaust means comprises a water tank, a water exhaust pump and a water conduit connecting said water exhaust pump with said water outiet on said heated chamber and said water tank, therefore, during decomposing of said waste, said water exhaust pump is activated simultaneously to suck said water steam generated from said heating waste and said water content of said heating waste inside said heated chamber to said water tank through said water outlet, and that said powder substance is collected in a removable tray disposed inside said heated chamber. 86. A waste treatment device, as recited in any of the claims 62-67, wherein said housing comprises an exterior case, a first tank mounted on an upper position inside said exterior case to define said cooling chamber therein, a second tank mounted on a lower position inside said exterior case to define said heated chamber therein, in which both said first tank and said second tank are made of heat insulation mateπal, moreover a chamber insulator layer is provided between said adjacent sides of said first and second tanks to prevent heat conduction between said cooling chamber and said heated chamber.
87. A waste treatment device, as recited in claim 84, wherein said housing comprises an exterior case, a first tank mounted on an upper position inside said exterior case to define said cooling chamber therein, a second tank mounted on a lower position inside said extenor case to define said heated chamber therein, in which both said first tank and said second tank are made of heat insulation material, moreover a chamber insulator layer is provided between said adjacent sides of said first and second tanks to prevent heat conduction between said cooling chamber and said heated chamber.
88. A waste treatment device, as recited in claim 85, wherein said housing compπses an exterior case, a first tank mounted on an upper position inside said extenor case to define said cooling chamber therein, a second tank mounted on a lower position inside said extenor case to define said heated chamber therein, in which both said first tank and said second tank are made of heat insulation material, moreover a chamber insulator layer is provided between said adjacent sides of said first and second tanks to prevent heat conduction between said cooling chamber and said heated chamber.