# US 10,502,460 B2 · Refrigerator > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,502,460 B2 - Document ID: US10502460B2 - Status: Granted - Kind: B2 - Application number: 15/545,559 - Filed: 2016-01-21 - Published: 2018-02-15 - Granted: 2019-12-10 - Earliest claimed: 2015-01-23 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Kyeongyun Kim; Kyungseok Kim; Kyunghun Cha - Web page: https://patentgrep.com/patent/US10502460B2 ## CPC - F25B 5/04: arranged in series - F25B 7/00: Compression machines, plants or systems, with cascade operation, i.e. with two or more circuits, the heat from the condenser of one circuit being absorbed by the evaporator of the next circuit (F25B9/00 takes precedence) - F25B 49/02: for compression type machines, plants or systems - F25B 49/022: {Compressor control arrangements} - F25B 25/005: {using primary and secondary systems} - F25B 2600/112: of evaporator fans - Y02B 30/70: Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating - F25B: REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS - Y02B: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS ## Abstract Disclosed is a refrigerator. The refrigerator includes a first compressor (100) configured to compress refrigerant, a first condenser (110) configured to condense the refrigerant compressed in the first compressor (100), a first expansion valve (120) configured to reduce a temperature and pressure of the refrigerant condensed in the first condenser (110), a first evaporator (140) configured to evaporate the refrigerant having passed through the first expansion valve (120), a second compressor (200) configured to compress refrigerant, a second condenser (210) configured to condense the refrigerant compressed in the second compressor (200), a second expansion valve (220) configured to reduce a temperature and pressure of the refrigerant condensed in the second condenser (210) and a second evaporator (230) configured to evaporate the refrigerant having passed through the second expansion valve (220). The refrigerator further includes a heat exchanger (130) located at a rear of the first expansion valve (120), and the heat exchanger (130) and the second condenser (210) undergo heat exchange therebetween. ## Claims ### Claim 1 A refrigerator comprising: a first compressor configured to compress a first refrigerant; a first condenser configured to condense the first refrigerant compressed by the first compressor; a first expansion valve configured to reduce a temperature and a pressure of the first refrigerant condensed by the first condenser; a first evaporator configured to evaporate the first refrigerant having passed through the first expansion valve, the first evaporator comprising a refrigerating compartment evaporator configured to exchange heat with first air inside of a refrigerating compartment of the refrigerator; a second compressor configured to compress a second refrigerant; a second condenser configured to condense the second refrigerant compressed by the second compressor; a second expansion valve configured to reduce a temperature and a pressure of the second refrigerant condensed by the second condenser; a second evaporator configured to evaporate the second refrigerant having passed through the second expansion valve, the second evaporator comprising a freezing compartment evaporator configured to exchange heat with second air inside of a freezing compartment of the refrigerator; a first fan configured to supply the first air having exchanged heat with the first evaporator to the refrigerating compartment; a second fan configured to supply the second air having exchanged heat with the second evaporator to the freezing compartment; and a heat exchanger arranged after and connected to the first expansion valve, the heat exchanger being arranged before and connected to the first evaporator, wherein the heat exchanger and the second condenser are configured to exchange heat with each other, wherein the first evaporator is configured to receive the first refrigerant from the heat exchanger, and wherein the freezing compartment is configured to receive cold air based on the first compressor, the second compressor, and the second fan being driven without the first fan being driven. ### Claim 2 (depends on 1) The refrigerator according to claim 1, wherein the heat exchanger is configured to absorb heat from the second condenser. ### Claim 3 (depends on 1) The refrigerator according to claim 1, wherein the heat exchanger is configured to evaporate at least a portion of the first refrigerant. ### Claim 4 (depends on 1) The refrigerator according to claim 1, wherein the first evaporator is configured to receive the first refrigerant that has passed through the heat exchanger and been guided to the first evaporator. ### Claim 5 (depends on 1) The refrigerator according to claim 1, wherein the first refrigerant compressed by the first compressor is different from the second refrigerant compressed by the second compressor. ### Claim 6 (depends on 1) The refrigerator according to claim 1, wherein the refrigerating compartment is configured to receive cold air based on the first compressor and the first fan being driven without the second compressor and the second fan being driven. ### Claim 7 (depends on 1) The refrigerator according to claim 1, wherein the refrigerating compartment and the freezing compartment are configured to receive cold air based on the first compressor, the first fan, the second compressor, and the second fan being driven. ### Claim 8 (depends on 1) The refrigerator according to claim 1, wherein the second compressor is configured to compress the second refrigerant to a lower temperature than a temperature of the first refrigerant compressed by the first compressor. ### Claim 9 (depends on 1) The refrigerator according to claim 1, wherein the first compressor and the second compressor are configured to be driven independently. ### Claim 10 (depends on 1) The refrigerator according to claim 1, wherein the heat exchanger is configured to evaporate a first portion of the first refrigerant, and wherein the first evaporator is configured to evaporate a second portion of the first refrigerant, the second portion of the first refrigerant being different from the first portion of the first refrigerant. ### Claim 11 (depends on 10) The refrigerator according to claim 10, wherein the second condenser is configured to reduce the temperature of the second refrigerant based on the heat exchanger evaporating the first portion of the first refrigerant. ### Claim 12 (depends on 1) The refrigerator according to claim 1, wherein the freezing compartment is configured to receive cold air based on the first compressor and the second compressor being simultaneously driven without the first fan being driven. ### Claim 13 (depends on 1) The refrigerator according to claim 1, wherein the heat exchanger is located closer to the second condenser than to the first condenser. ### Claim 14 (depends on 1) The refrigerator according to claim 1, wherein the first evaporator is disposed between the heat exchanger and the first compressor.