3 STAGE COOLING AND DEFROSTING SYSTEM USING QUICK-FREEZING CHAMBER, FREEZING CHAMBER, AND REFRIGERATING CHAMBER

Abstract

The present invention relates to a system for cooling a quick-freezing chamber at 40 to 30 C., a freezing chamber at 20 to 15 C., a refrigerating chamber at 0 to 5 C., and the like and an energy-saving defrosting system for defrosting the quick-freezing chamber, the freezing chamber, and the refrigerating chamber using condensed waste heat.

Claims

1. A 3 stage cooling and energy saving defrosting system using 40-30 C. of quick-freezing chamber, 20-15 C. of freezing chamber, and 05 C. of refrigerating chamber, comprising the 3 stage cooling steps of: 1) 40-30 C. of quick-freezing step in quick-freezing chamber, wherein the liquid phase refrigerant sprayed from electronic valve (S3) away from condenser after 2 step compression is evaporated and then the ultra lower temperature of liquid phase refrigerant sequentially is further evaporated until the quick-freezing chamber to be lower than 40 C.; 2) 20-15 C. of freezing step in freezing chamber, wherein the refrigerant injected from electronic valve (R1) after recovery from quick-freezing chamber is evaporated after closing electronic valve (V1), and the liquid phase refrigerant sprayed from electronic valve (S2) away from condenser can be further evaporated until the freezing chamber to be 20 C.; and 3) 05 C. of refrigerating step in refrigerating chamber, wherein the refrigerant injected from electronic valve (R2) after recovery from quick-freezing chamber and/or freezing chamber is evaporated after closing electronic valve (V2), and the liquid phase refrigerant sprayed from electronic valve (S1) away from condenser can be further evaporated until the refrigerating chamber to be 0 C.

2. The 3 stage cooling and defrosting system according to claim 1, wherein the structure of 3 stage cooling system comprises 1) a multi (2) step compressor comprising a lower step compressor for compressing the vapor phase refrigerant to be medium pressure, an inter-cooler for cooling the refrigerant until the saturation temperature corresponding to medium pressure, and a higher step compressor for compressing the cooled refrigerant to be high pressure and high temperature of vapor phase refrigerant; 2) a condenser for condensing the high pressure and high temperature vapor phase refrigerant from compressor to be liquid phase refrigerant; 3) a quick-freezing evaporator for quick-freezing the chamber using liquid phase refrigerant from condenser; 4) a freezing evaporator for freezing the chamber using liquid phase refrigerant from condenser and/or vapor phase refrigerant recovered from quick-freezing chamber; and 5) a refrigerating evaporator for refrigerating the chamber using liquid phase refrigerant from condenser and/or vapor phase refrigerant recovered from quick-freezing chamber and/or freezing chamber.

3. The 3 stage cooling and defrosting system according to claim 1, wherein said 3 stage cooling system comprising the steps of: 1) 40-30 C. of quick-freezing step in quick-freezing chamber, wherein the low temperature of liquid phase refrigerant sprayed from expansion valve (1) passing through electronic valve (a, b) away from condenser after 2 step compression is evaporated until the quick-freezing chamber to be 25 C., and then the ultra lower temperature of liquid phase refrigerant sprayed from expansion valve (2) sequentially is evaporated until the quick-freezing chamber to be lower than 40 C.; 2) 20-15 C. of freezing step in freezing chamber, wherein the vapor phase refrigerant injected from electronic valve (7) after recovery from quick-freezing chamber is evaporated, and the low temperature of liquid phase refrigerant sprayed from electronic valve (4) passing through electronic valve (c, d) away from condenser is evaporated until the freezing chamber to be 20 C.; and 3) 05 C. of refrigerating step in refrigerating chamber, wherein the vapor phase refrigerant injected from electronic valve (8) after recovery from quick-freezing chamber and/or freezing chamber is evaporated, and the low temperature of liquid phase refrigerant sprayed from electronic valve (e, f) away from condenser is evaporated until the refrigerating chamber to be 0 C.

4. The 3 stage cooling and defrosting system according to claim 3, wherein if the temperature of recovered refrigerant from quick-freezing chamber is higher than 20 C. in 2nd freezing step, the liquid phase refrigerant is injected and evaporated for freezing the chamber after opening electronic valve (c) and manual valve (e), while the liquid phase refrigerant is injected and evaporated for refrigerating the chamber after opening electronic valve (e) and manual valve (5), if the temperature of recovered refrigerant from quick-freezing chamber and/or freezing chamber is higher than 0 C. in 3rd refrigerating step.

5. The 3 stage cooling and defrosting system according to claim 1, wherein upon selecting the normal operation or the defrosting operation by control panel; in normal operation, the cooling system is operated and circulated after suspending circulation pump [5] for defrosting with closing check valve (V7), wherein the wasted heat energy emitted from external condenser [2] is received and stored in the waste heat storage tank [4], after heat exchange between external condenser and brine until the temperature of brine becomes to be 3040 C., while in defrosting operation, the defrosting system is started and operated by restarting and operating circulation pump [5] with opening check valve (V7) after suspending the operation of cooling system, wherein 3040 C. of heated brine stored in the waste heat storage tank [4] is supplied into brine pipe for removing a frost present outer surface of evaporator [3] and 415 C. of brine is circulated and recovered to waste heat storage tank [4].

6. The 3 stage cooling and defrosting system according to claim 5, wherein if the temperature of brine in waste heat storage tank [4] is lower than 40 C. in normal operation, another route of 3 way valve [6] is open for supplying the heat energy from high temperature of vapor refrigerant directly to the waste heat storage tank [4] by closing normal circulation route of vapor phase refrigerant, while 3 way valve [6] is open for normal circulation route, if the temperature of brine in waste heat storage tank [4] is higher than 40 C., 3 way valve [6] is open for ordinary route.

7. The 3 stage cooling and defrosting system according to claim 2, wherein said 3 stage cooling system comprises the steps of: 1) 40-30 C. of quick-freezing step in quick-freezing chamber, wherein the low temperature of liquid phase refrigerant sprayed from expansion valve (1) passing through electronic valve (a, b) away from condenser after 2 step compression is evaporated until the quick-freezing chamber to be 25 C., and then the ultra lower temperature of liquid phase refrigerant sprayed from expansion valve (2) sequentially is evaporated until the quick-freezing chamber to be lower than 40 C.; 2) 20-15 C. of freezing step in freezing chamber, wherein the vapor phase refrigerant injected from electronic valve (7) after recovery from quick-freezing chamber is evaporated, and the low temperature of liquid phase refrigerant sprayed from electronic valve (4) passing through electronic valve (c, d) away from condenser is evaporated until the freezing chamber to be 20 C.; and 3) 05 C. of refrigerating step in refrigerating chamber, wherein the vapor phase refrigerant injected from electronic valve (8) after recovery from quick-freezing chamber and/or freezing chamber is evaporated, and the low temperature of liquid phase refrigerant sprayed from electronic valve (e, f) away from condenser is evaporated until the refrigerating chamber to be 0 C.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0022] FIG. 1 is a schematic diagram of the whole configuration of 3 stage cooling and defrosting system comprising 40-30 C. of quick-freezing chamber, 20-15 C. of freezing chamber, and 05 C. of refrigerating chamber of the present invention, wherein waste heat energy from condenser is used for defrosting quick-freezing chamber, freezing chamber and refrigerating chamber

[0023] FIG. 2 is a schematic diagram for illustrating the multi-step compression of 3 stage cooling system comprising quick-freezing chamber, freezing chamber, and refrigerating chamber of the present invention.

[0024] As shown in FIG. 2, multi (2) step compressor of present invention comprises a lower step compressor for compressing the vapor phase refrigerant to be medium pressure, an inter-cooler for cooling the refrigerant until the saturation temperature corresponding to medium pressure, and a higher step compressor for compressing the cooled refrigerant to be high pressure and high temperature of vapor phase refrigerant.

[0025] FIG. 3 is a schematic diagram for illustrating the supply, circulation and recovery of refrigerant in 3 stage cooling system comprising quick-freezing chamber, freezing chamber, and refrigerating chamber of the present invention.

[0026] As shown in FIG. 3, 3 stage cooling system of the present invention starts from the first quick-freezing step for 40-30 C. of quick-freezing chamber, wherein the low temperature of liquid phase refrigerant injected from expansion valve (1) passing through electronic valve (a, b) away from condenser after 2 step compression is expanded and evaporated until the quick-freezing chamber to be 25 C. and then the ultra lower temperature of liquid phase refrigerant injected from expansion valve (2) sequentially is expanded and evaporated until the quick-freezing chamber to be lower than 40 C.

[0027] Subsequently, the second freezing step for 20-15 C. of freezing chamber follows. The vapor phase refrigerant injected from electronic valve (7) after recovery from quick-freezing chamber is evaporated. If the recovered vapor phase refrigerant is not sufficient for freezing chamber, the low temperature of liquid phase refrigerant supplied from electronic valve (4) passing through electronic valve (c, d) away from condenser is expanded and evaporated until the freezing chamber to be 20 C.

[0028] Finally, third refrigerating step for 05 C. of refrigerating chamber follows. The vapor phase refrigerant injected from electronic valve (8) after recovery from quick-freezing chamber and/or freezing chamber is evaporated. If the recovered vapor phase refrigerant is not sufficient for refrigerating chamber, the low temperature of liquid phase refrigerant supplied from electronic valve (6) passing through electronic valve (e, f) away from away from condenser is expanded and evaporated until the refrigerating chamber to be 0 C.

[0029] FIG. 4 is a schematic diagram for illustrating the supply, circulation and recovery of refrigerant of quick-freezing chamber unit cooler (evaporator), freezing chamber unit cooler (evaporator) and refrigerating chamber unit cooler (evaporator) of the present invention.

[0030] Through the main pipe, low temperature liquid phase refrigerant is sequentially supplied to quick-freezing chamber unit cooler, freezing chamber unit cooler and refrigerating chamber unit cooler. Recovered vapor refrigerant from quick-freezing chamber unit cooler is supplied to freezing chamber unit cooler after closing electronic valve (V1) and recovered vapor refrigerant from freezing chamber unit cooler is supplied to refrigerating chamber unit cooler after closing electronic valve (V2). Electronic valve or manual valve can be used for its convenience.

[0031] FIG. 5A shows the normal operation of 3 stage cooling and defrosting system comprising quick-freezing chamber, freezing chamber, and refrigerating chamber of the present invention.

[0032] In normal operation, the cooling system is operated and circulated after suspending circulation pump [5] used for defrosting with closing check valve (V7). Then, the wasted heat energy emitted from external condenser [2] is received and stored in the waste heat storage tank [4] until the temperature of brine becomes to be 3040 C. upon heat exchanging between external condenser and brine.

[0033] FIG. 5B shows the defrosting operation of 3 stage cooling and defrosting system comprising quick-freezing chamber, freezing chamber, and refrigerating chamber of the present invention. The waste heat energy from condenser is used for defrosting quick-freezing chamber, freezing chamber and refrigerating chamber.

[0034] In defrosting operation, the defrosting system is started and operated by restarting and operating circulation pump [5] with opening check valve (V7) after suspending the operation of cooling system. 3040 C. of heated brine stored in the waste heat storage tank [4] is supplied into brine pipe for removing a frost present outer surface of evaporator [3] and brine is circulated and recovered to waste heat storage tank [4].

PREFERRED EMBODIMENT OF INVENTION

[0035] The invention relates to a 3 stage cooling and energy saving defrosting system using 40-30 C. of quick-freezing chamber, 20-15 C. of freezing chamber, and 05 C. of refrigerating chamber, comprising the 3 stage cooling steps of: 1) 40-30 C. of quick-freezing step in quick-freezing chamber, wherein the liquid phase refrigerant sprayed from electronic valve (S3) away from condenser after 2 step compression is evaporated and then the ultra lower temperature of liquid phase refrigerant sequentially is further evaporated until the quick-freezing chamber to be lower than 40 C.; 2) 20-15 C. of freezing step in freezing chamber, wherein the refrigerant injected from electronic valve (R1) after recovery from quick-freezing chamber is evaporated after closing electronic valve (V1), and the liquid phase refrigerant sprayed from electronic valve (S2) away from condenser can be further evaporated until the freezing chamber to be 20 C. and 3) 05 C. of refrigerating step in refrigerating chamber, wherein the refrigerant injected from electronic valve (R2) after recovery from quick-freezing chamber and/or freezing chamber is evaporated after closing electronic valve (V2), and the liquid phase refrigerant sprayed from electronic valve (S1) away from condenser can be further evaporated until the refrigerating chamber to be 0 C.

[0036] Further, normal operation and defrosting operation is selected by control panel. In normal operation, the cooling system is operated and circulated after suspending circulation pump [5] for defrosting with closing check valve (V7), wherein the wasted heat energy emitted from external condenser [2] is received and stored in the waste heat storage tank [4], after heat exchange between external condenser and brine until the temperature of brine becomes to be 3040 C. Further, in defrosting operation, the defrosting system is started and operated by restarting and operating circulation pump [5] with opening check valve (V7) after suspending the operation of cooling system, wherein 3040 C. of heated brine stored in the waste heat storage tank [4] is supplied into brine pipe for removing a frost present outer surface of evaporator [3] and 415 C. of brine is circulated and recovered to waste heat storage tank [4].

[0037] The present invention can be explained more specifically in reference to attached drawings.

[0038] FIG. 1 is a schematic diagram of the whole configuration of 3 stage cooling and defrosting system comprising 40-30 C. of quick-freezing chamber, 20-15 C. of freezing chamber, and 05 C. of refrigerating chamber of the present invention, wherein waste heat energy from condenser is used for defrosting quick-freezing chamber, freezing chamber and refrigerating chamber

[0039] The cooling system for cooling quick-freezing chamber, freezing chamber and refrigerating chamber of the present invention can be explained as follows. The compressed vapor phase refrigerant by the compressor can be easily condensed in the condenser. In the course of condensing the compressed vapor phase refrigerant, the waste heat is emitted outside of condenser, which is transferred and stored in waste heat storage tank. Further, high temperature of condensed refrigerant is transferred and sequentially supplied to quick-freezing cooler, freezing cooler and refrigerating cooler, where the refrigerant is evaporated with absorption of surrounded heat energy in quick-freezing chamber, freezing chamber and refrigerating chamber. Finally, vapor phase refrigerant from evaporator is recovered to compressor and the cooling cycle will be repeated.

[0040] On the other hand, the defrosting system for defrosting quick-freezing cooler, freezing cooler and refrigerating cooler of the present invention can be explained as follows. The brine is heated and stored in waste heat storage tank upon receiving the waste heat energy emitted from condenser. Further, the heated brine is sequentially supplied into the defroster for quick-freezing cooler, freezing cooler and refrigerating cooler. After defrosting, the brine is recover to waste heat storage tank.

[0041] FIG. 2 is a schematic diagram for illustrating the multi-step compression of 3 stage cooling system comprising quick-freezing chamber, freezing chamber, and refrigerating chamber of the present invention.

[0042] As shown in FIG. 2, multi (2) step compressor of present invention comprises a lower step compressor for compressing the vapor phase refrigerant to be medium pressure, an inter-cooler for cooling the refrigerant until the saturation temperature corresponding to medium pressure, and a higher step compressor for compressing the cooled refrigerant to be high pressure and high temperature of vapor phase refrigerant

[0043] Further, the structure of 3 stage cooling system can be explained as follows. The multi (2) step compressor comprises a lower step compressor for compressing the vapor phase refrigerant to be medium pressure, an inter-cooler for cooling the refrigerant until the saturation temperature corresponding to medium pressure, and a higher step compressor for compressing the cooled refrigerant to be high pressure and high temperature of vapor phase refrigerant. The condenser condenses the high pressure and high temperature vapor phase refrigerant from compressor to be liquid phase refrigerant. The quick-freezing evaporator quickly-freezes the chamber using liquid phase refrigerant from condenser. The freezing evaporator freezes the chamber using liquid phase refrigerant from condenser and/or vapor phase refrigerant recovered from quick-freezing chamber. Finally, the refrigerating evaporator refrigerates the chamber using liquid phase refrigerant from condenser and/or vapor phase refrigerant recovered from quick-freezing chamber and/or freezing chamber.

[0044] FIG. 3 is a schematic diagram for illustrating the supply, circulation and recovery of refrigerant in 3 stage cooling system comprising quick-freezing chamber, freezing chamber, and refrigerating chamber of the present invention.

[0045] As shown in FIG. 3, 3 stage cooling system of the present invention starts from the first quick-freezing step for 40-30 C. of quick-freezing chamber, wherein the low temperature of liquid phase refrigerant injected from expansion valve (1) passing through electronic valve (a, b) away from condenser after 2 step compression is expanded and evaporated until the quick-freezing chamber to be 25 C. and then the ultra lower temperature of liquid phase refrigerant injected from expansion valve (2) sequentially is expanded and evaporated until the quick-freezing chamber to be lower than 40 C.

[0046] Subsequently, the second freezing step for 20-15 C. of freezing chamber follows. The vapor phase refrigerant injected from electronic valve (7) after recovery from quick-freezing chamber is evaporated. If the recovered vapor phase refrigerant is not sufficient for freezing chamber, the low temperature of liquid phase refrigerant supplied from electronic valve (4) passing through electronic valve (c, d) away from condenser is expanded and evaporated until the freezing chamber to be 20 C.

[0047] Finally, third refrigerating step for 05 C. of refrigerating chamber follows. The vapor phase refrigerant injected from electronic valve (8) after recovery from quick-freezing chamber and/or freezing chamber is evaporated. If the recovered vapor phase refrigerant is not sufficient for refrigerating chamber, the low temperature of liquid phase refrigerant supplied from electronic valve (6) passing through electronic valve (e, f) away from away from condenser is expanded and evaporated until the refrigerating chamber to be 0 C.

[0048] On the other hand, if the temperature of recovered refrigerant from quick-freezing chamber is higher than 20 C. in the second freezing step, the liquid phase refrigerant is sprayed and evaporated for freezing the chamber after opening electronic valve (c) and manual valve (e).

[0049] Further, if the temperature of recovered refrigerant from quick-freezing chamber and/or freezing chamber is higher than 0 C. in third refrigerating step, the liquid phase refrigerant is sprayed and evaporated for refrigerating the chamber after opening electronic valve (e) and manual valve (5).

[0050] FIG. 4 is a schematic diagram for illustrating the supply, circulation and recovery of refrigerant of quick-freezing chamber unit cooler (evaporator), freezing chamber unit cooler (evaporator) and refrigerating chamber unit cooler (evaporator) of the present invention.

[0051] As shown in FIG. 4, through the main pipe, low temperature liquid phase refrigerant is sequentially supplied to quick-freezing chamber unit cooler, freezing chamber unit cooler and refrigerating chamber unit cooler. Recovered vapor refrigerant from quick-freezing chamber unit cooler is supplied to freezing chamber unit cooler after closing electronic valve (V1) and recovered vapor refrigerant from freezing chamber unit cooler is supplied to refrigerating chamber unit cooler after closing electronic valve (V2). Electronic valve or manual valve can be used for its convenience.

[0052] FIG. 5A shows the normal operation of 3 stage cooling and defrosting system comprising quick-freezing chamber, freezing chamber, and refrigerating chamber of the present invention.

[0053] In normal operation, the cooling system is operated and circulated after suspending circulation pump [5] used for defrosting with closing check valve (V7). Then, the wasted heat energy emitted from external condenser [2] is received and stored in the waste heat storage tank [4] until the temperature of brine becomes to be 3040 C. upon heat exchanging between external condenser and brine.

[0054] If the temperature of brine in waste heat storage tank [4] is lower than 40 C. in normal operation, another route of 3 way valve [6] is open for supplying the heat energy from high temperature of vapor refrigerant directly to the waste heat storage tank [4] by closing normal circulation route of vapor phase refrigerant. On the other hand, if the temperature of brine in waste heat storage tank [4] is higher than 40 C. 3 way valve [6] is open for normal circulation route.

[0055] FIG. 5B shows the defrosting operation of 3 stage cooling and defrosting system comprising quick-freezing chamber, freezing chamber, and refrigerating chamber of the present invention. The waste heat energy from condenser is used for defrosting quick-freezing chamber, freezing chamber and refrigerating chamber.

[0056] In defrosting operation, the defrosting system is started and operated by restarting and operating circulation pump [5] with opening check valve (V7) after suspending the operation of cooling system. 3040 C. of heated brine stored in the waste heat storage tank [4] is supplied into brine pipe for removing a frost present outer surface of evaporator [3] and brine is circulated and recovered to waste heat storage tank [4].

REFERENCE NUMERAL

[0057] a, b: electronic valve for supplying liquid refrigerant to quick-freezing chamber [0058] c, d: electronic valve for supplying liquid refrigerant to freezing chamber [0059] e, f: electronic valve for supplying refrigerant to refrigerating chamber [0060] 1: expansion valve in quick-freezing chamber for cooling to 25 C. [0061] 2: expansion valve in quick-freezing chamber for cooling to 40 C. [0062] 3: manual valve for spaying refrigerant to freezing chamber [0063] 4: expansion valve for freezing chamber [0064] 5: manual valve for spaying refrigerant to refrigerating chamber [0065] 6: expansion valve for refrigerating chamber [0066] 7: electronic valve for supplying vapor refrigerant to freezing chamber [0067] 8: electronic valve for supplying vapor refrigerant to refrigerating chamber [0068] 9, 10, 11, 12: Blocking electronic valves [0069] S1: electronic valve for supplying refrigerant to refrigerating chamber [0070] S2: electronic valve for supplying liquid refrigerant to freezing chamber [0071] S3: electronic valve for supplying liquid refrigerant to quick-freezing chamber [0072] S8: condenser external temperature sensor [0073] S9: stored brine temperature sensor [0074] S10: waste heat exchanger temperature sensor [0075] S11: cooler temperature sensor [0076] S12: frost detection sense sensor [0077] S13: supplied brine temperature sensor [0078] V1: electronic valve for vapor refrigerant recovery [0079] V2: electronic valve for vapor refrigerant recovery [0080] V7: check valve [0081] R1: electronic valve for vapor refrigerant supply to freezing chamber [0082] R2: electronic valve for vapor refrigerant supply to refrigerating chamber