US 12,083,861 B2
Heat pump system for vehicle
Yeonho Kim, Seoul (KR); Wan Je Cho, Hwaseong-si (KR); Won Seok Sung, Seoul (KR); Jeawan Kim, Hwaseong-si (KR); Jae Yeon Kim, Hwaseong-si (KR); and Seong-Bin Jeong, Hwaseong-si (KR)
Assigned to Hyundai Motor Company, Seoul (KR); and Kia Corporation, Seoul (KR)
Filed by Hyundai Motor Company, Seoul (KR); and Kia Corporation, Seoul (KR)
Filed on Mar. 31, 2022, as Appl. No. 17/710,291.
Claims priority of application No. 10-2021-0112273 (KR), filed on Aug. 25, 2021.
Prior Publication US 2023/0063915 A1, Mar. 2, 2023
Int. Cl. B60H 1/00 (2006.01)
CPC B60H 1/00921 (2013.01) 14 Claims
OG exemplary drawing
 
1. A heat pump system for a vehicle, the heat pump system comprising:
a cooling apparatus that includes a coolant line, and circulates a coolant in the coolant line; and
an air conditioning device that circulates a refrigerant along a refrigerant line to control an indoor temperature of the vehicle,
wherein the air conditioning device includes first and second heat exchangers connected through the refrigerant line,
wherein in a heating mode of the vehicle, the first heat exchanger and the second heat exchanger are supplied with a refrigerant separated into the refrigerant line and a first branch line after being expanded, or a refrigerant expanded after being separated into the refrigerant line and the first branch line,
wherein a first end portion of the first branch line is connected to the refrigerant line at a front end portion of the first heat exchanger based on a flow direction of the refrigerant, and
wherein a second end portion of the first branch line is connected to the refrigerant line between the first heat exchanger and the second heat exchanger,
wherein the first branch line is provided with a first refrigerant valve,
wherein the air conditioning device includes:
an evaporator which is connected to the second heat exchanger through the refrigerant line;
a compressor which is connected to the evaporator through the refrigerant line;
an internal condenser which is connected to the compressor through the refrigerant line;
a first expansion valve which is provided in the refrigerant line between the second heat exchanger and the evaporator;
a second branch line that selectively connects the first heat exchanger and an accumulator through a second refrigerant valve for selective inflow of a refrigerant passed through the first heat exchanger to the compressor after passing through the accumulator; and
a third branch line that selectively connects the second heat exchanger and the accumulator for selective inflow of the refrigerant that has passed through the second heat exchanger to the compressor after passing through the accumulator,
wherein a first end portion of the third branch line is connected to the refrigerant line between the second heat exchanger and the first expansion valve,
wherein a second end portion of the third branch line is connected to the refrigerant line between the evaporator and the accumulator,
wherein the first heat exchanger is connected to the cooling apparatus through the coolant line for heat-exchange of the refrigerant with a coolant, and
wherein the second heat exchanger is an air-cooled heat exchanger that condenses or evaporates the refrigerant through heat-exchange with outside air.