# US 11,079,162 B2 · Refrigerator > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,079,162 B2 - Document ID: US11079162B2 - Status: Granted - Kind: B2 - Application number: 16/072,342 - Filed: 2017-01-25 - Published: 2019-03-07 - Granted: 2021-08-03 - Earliest claimed: 2016-01-29 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Sangbok Choi; Yonghwan Eom; Kyongbae Park; Juyeong Heo; Cholok Han; Sungwook Kim; Wookyung Baik - Web page: https://patentgrep.com/patent/US11079162B2 ## CPC - F25D 21/025: {using air pressure differential detectors} - F25B 49/02: for compression type machines, plants or systems - F25D 17/08: using ducts - F25D 21/006: {with electronic control circuits} - G01L 27/007: {Malfunction diagnosis, i.e. diagnosing a sensor defect} - F25B 2700/197: of the evaporator - F25B 2700/21175: of the refrigerant at the outlet of the evaporator - F25D 2317/063: with air guides - F25D 2317/0672: Outlet ducts - F25D 2700/121: of particular compartments - F25D: REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR (refrigerated showcases A47F3/04; thermally-insulated vessels for domestic use A47J41/00; refrigerated vehicles, see the appropriate subclasses of classes B60 - B64; containers with thermal insulation in general B65D81/38; heat-transfer, heat-exchange or heat-storage materials, e.g. refrigerants, or materials for the production of heat or cold by chemical reactions other than by combustion C09K5/00; thermally-insulated vessels for liquefied or solidified gases F17C; air-conditioning or air-humidification F24F; refrigeration machines, plants, or systems F25B; cooling of instruments or comparable apparatus without refrigeration G12B) - F25B: REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS - G01L: MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE (weighing G01G) ## Abstract The present invention provides a refrigerator comprising: a cabinet having a storage chamber; a door for opening or closing the storage chamber; a case in which an inlet through which air flows from the storage chamber and an outlet through which the air is discharged to the storage chamber are formed; an evaporator provided inside the case for exchanging heat with the air to supply cool air; and a differential pressure sensor provided inside the case. ## Claims ### Claim 1 A refrigerator comprising: a cabinet that defines a storage compartment; a door configured to open and close at least a portion of the storage compartment; a case having a surface that defines an inlet configured to receive air from the storage compartment and an outlet configured to discharge air to the storage compartment, the outlet being located vertically above the inlet; a fan located at the surface of the case and configured to generate air flow in a direction vertically upward from the inlet to the outlet along the surface of the case; an evaporator that is located at the case, that is configured to exchange heat with air, and that is configured to supply cool air to the storage compartment, the evaporator being located vertically above the inlet and vertically below the outlet; and a differential pressure sensor located at the case, the differential pressure sensor comprising: a first pipe that defines a first through-hole at a lower end of the first pipe between the evaporator and the inlet, the first through-hole being oriented down toward the inlet, a second pipe that defines a second through-hole at a lower end of the second pipe between the evaporator and the outlet, the second through-hole being located vertically above the first through-hole and oriented down toward the evaporator, and a connection member that is located vertically above the evaporator and connects upper ends of the first pipe and the second pipe to each other, wherein the differential pressure sensor is configured to sense a difference in air pressure between the first through-hole and the second through-hole. ### Claim 2 (depends on 1) The refrigerator according to claim 1, wherein the connection member comprises an electronic circuit configured to determine the difference in air pressure between the first through-hole and the second through-hole. ### Claim 3 (depends on 2) The refrigerator according to claim 2, wherein the connection member is located vertically above the evaporator. ### Claim 4 (depends on 1) The refrigerator according to claim 1, wherein the first pipe and the second pipe extend vertically above the evaporator. ### Claim 5 (depends on 1) The refrigerator according to claim 1, wherein the first pipe or the second pipe has a hollow shape that has a circular cross section. ### Claim 6 (depends on 1) The refrigerator according to claim 1, wherein the connection member is located vertically above the fan. ### Claim 7 (depends on 1) The refrigerator according to claim 1, wherein the first pipe defines a plurality of communication holes that are oriented perpendicular to the first through-hole, or the second pipe defines a plurality of communication holes that are oriented perpendicular to the second through-hole. ### Claim 8 (depends on 1) The refrigerator according to claim 1, wherein the first pipe or the second pipe comprises a first expansion part that extends from an end of a corresponding pipe of the first pipe or the second pipe, and wherein a diameter of the first expansion part increases toward a lower end of the first expansion part. ### Claim 9 (depends on 8) The refrigerator according to claim 8, wherein a lower part of the first expansion part defines the first through-hole or the second through-hole at a side surface of the corresponding pipe of the first pipe or the second pipe. ### Claim 10 (depends on 9) The refrigerator according to claim 9, wherein the first expansion part comprises a second expansion part that extends from a lower part of the first expansion part, and wherein a diameter of the second expansion part increases toward a lower end of the second expansion part. ### Claim 11 (depends on 10) The refrigerator according to claim 10, wherein a lower part of the second expansion part lacks a hole that allows air to move upward from the lower part of the second expansion part. ### Claim 12 (depends on 11) The refrigerator according to claim 11, wherein the second expansion part extends radially outward of the first expansion part, and wherein a sectional area of the lower end of the second expansion part is greater than a sectional area of the lower end of the first expansion part. ### Claim 13 (depends on 1) The refrigerator according to claim 1, wherein the first pipe or the second pipe comprises a first portion that is coupled to the connection member and a second portion that defines the first through-hole or the second through-hole, and wherein a sectional area of the first portion is less than a sectional area of the second portion. ### Claim 14 (depends on 1) The refrigerator according to claim 1, further comprising: a heater located at the case; and a controller configured to control driving of the heater to defrost the evaporator based on the difference in air pressure sensed by the differential pressure sensor. ### Claim 15 (depends on 14) The refrigerator according to claim 14, further comprising a door switch configured to sense whether the door is opened or closed, wherein the controller is further configured to, based on the door switch sensing that the door is closed, control the differential pressure sensor to sense the difference in air pressure. ### Claim 16 (depends on 14) The refrigerator according to claim 14, wherein the controller is further configured to, based on the fan being driven, control the differential pressure sensor to sense the difference in air pressure. ### Claim 17 (depends on 14) The refrigerator according to claim 14, further comprising an evaporator temperature sensor configured to measure a temperature of the evaporator, wherein the controller is further configured to: drive the heater to defrost the evaporator, and stop driving of the heater in response to the measured temperature of the evaporator being increased to a set temperature. ### Claim 18 (depends on 1) The refrigerator according to claim 1, further comprising a cover that closes a lower part of the first pipe or the second pipe and that is configured to restrict entry of water to the differential pressure sensor. ### Claim 19 (depends on 1) The refrigerator according to claim 1, wherein the case is disposed rearward relative to the storage compartment. ### Claim 20 (depends on 1) The refrigerator according to claim 1, wherein the connection member is attached to the surface of the case.