Heat pump air-conditioning system and electric vehicle

Patent metadata

Field	Value
Publication number	US-10843528-B2
Application number	US-201716099636-A
Country	US
Kind code	B2
Filing date	May 3, 2017
Priority date	May 10, 2016
Publication date	Nov 24, 2020
Grant date	Nov 24, 2020

Abstract

A heat pump air-conditioning system includes a HVAC assembly, a compressor, an outdoor heat exchanger, and a first plate heat exchanger. The HVAC assembly includes an indoor condenser, an indoor evaporator, and an damper mechanism. The compressor communicates to the indoor condenser. The indoor condenser communicates to the outdoor heat exchanger and further to the outdoor heat exchanger through a first enthalpy-increased branch. The outdoor heat exchanger communicates to the indoor evaporator and further to a moderate-pressure air inlet of the compressor through a second enthalpy-increased branch. The indoor evaporator communicates to a low-pressure air inlet of the compressor. The first enthalpy-increased branch and the second enthalpy-increased branch exchange heat by using the first plate heat exchanger. The second enthalpy-increased branch is provided with a first expansion valve. The outdoor heat exchanger is in communication with the first plate heat exchanger through the first expansion valve.

First claim

What is claimed is:

1. A heat pump air-conditioning system, comprising: a Heating Ventilation and Air Conditioning (HVAC) assembly, a compressor, an outdoor heat exchanger, and a first plate heat exchanger, wherein the HVAC assembly comprises an indoor condenser and an indoor evaporator, an outlet of the compressor is in communication with an inlet of the indoor condenser, an outlet of the indoor condenser is in communication with an inlet of the outdoor heat exchanger selectively through a first throttle branch or a first through-flow branch, an outlet of the outdoor heat exchanger is in communication with an inlet of the indoor evaporator selectively through a second throttle branch or a second through-flow branch, an outlet of the indoor evaporator is in communication with a low-pressure air inlet of the compressor, the outlet of the indoor condenser is further in communication with the inlet of the outdoor heat exchanger through a first enthalpy-increased branch that is selectively open or closed, the outlet of the outdoor heat exchanger is further in communication with a moderate-pressure air inlet of the compressor through a second enthalpy-increased branch, the first enthalpy-increased branch and the second enthalpy-increased branch exchange heat by using the first plate heat exchanger, the second enthalpy-increased branch is provided with a first expansion valve, and the outlet of the outdoor heat exchanger is in communication with the first plate heat exchanger through the first expansion valve.

2. The heat pump air-conditioning system according to claim 1 , wherein the first enthalpy-increased branch is provided with a first switch valve, and the outlet of the indoor condenser is in communication with the first plate heat exchanger through the first switch valve.

3. The heat pump air-conditioning system according to claim 1 , wherein the first through-flow branch is provided with a second switch valve, and the first throttle branch is provided with a second expansion valve.

4. The heat pump air-conditioning system according to claim 1 , wherein the heat pump air-conditioning system further comprises a first expansion switch valve, an inlet of the first expansion switch valve is in communication with the outlet of the indoor condenser, an outlet of the first expansion switch valve is in communication with the inlet of the outdoor heat exchanger, the first throttle branch is a throttle passage of the first expansion switch valve, and the first through-flow branch is a through-flow passage of the first expansion switch valve.

5. The heat pump air-conditioning system according to claim 1 , wherein the second through-flow branch is provided with a third switch valve, and the second throttle branch is provided with a third expansion valve.

6. The heat pump air-conditioning system according to claim 5 , wherein the heat pump air-conditioning system is applied to an electric vehicle, and the heat pump air-conditioning system further comprises a second plate heat exchanger, wherein the second plate heat exchanger is disposed inside the second through-flow branch, and the second plate heat exchanger is also disposed inside a motor cooling system of the electric vehicle.

7. The heat pump air-conditioning system according to claim 6 , wherein a refrigerant inlet of the second plate heat exchanger is in communication with the outlet of the outdoor heat exchanger, and a refrigerant outlet of the second plate heat exchanger is in communication with an inlet of the third switch valve.

8. The heat pump air-conditioning system according to claim 7 , wherein the motor cooling system comprises a motor, a motor heat dissipator, and a water pump that are connected in series to the second plate heat exchanger to form a loop.

9. The heat pump air-conditioning system according to claim 6 , wherein the motor cooling system comprises a motor, a motor heat dissipator, and a water pump that are connected in series to the second plate heat exchanger to form a loop.

10. The heat pump air-conditioning system according to claim 1 , wherein the heat pump air-conditioning system further comprises a second expansion switch valve, an inlet of the second expansion switch valve is in communication with the outlet of the outdoor heat exchanger, an outlet of the second expansion switch valve is in communication with the inlet of the indoor evaporator, the second throttle branch is a throttle passage of the second expansion switch valve, and the second through-flow branch is a through-flow passage of the second expansion switch valve.

11. The heat pump air-conditioning system according to claim 10 , wherein the heat pump air-conditioning system is applied to an electric vehicle, and the heat pump air-conditioning system further comprises a second plate heat exchanger, wherein a refrigerant inlet of the second plate heat exchanger is in communication with the outlet of the second expansion switch valve, a refrigerant outlet of the second plate heat exchanger is in communication with the inlet of the indoor evaporator, and the second plate heat exchanger is also disposed inside a motor cooling system of the electric vehicle.

12. The heat pump air-conditioning system according to claim 11 , wherein the motor cooling system comprises a coolant trunk, a first coolant branch, and a second coolant branch, a first end of the coolant trunk is selectively in communication with a first end of the first coolant branch or a first end of the second coolant branch, and a second end of the first coolant branch and a second end of the second coolant branch are in communication with a second end of the coolant trunk, wherein a motor, a motor heat dissipator, and a water pump are connected in series to the coolant trunk, and the second plate heat exchanger is connected in series to the first coolant branch.

13. The heat pump air-conditioning system according to claim 1 , wherein the heat pump air-conditioning system further comprises a gas-liquid separator, the outlet of the indoor evaporator is in communication with an inlet of the gas-liquid separator, and an outlet of the gas-liquid separator is in communication with the low-pressure air inlet of the compressor.

14. The heat pump air-conditioning system according to claim 1 , wherein the HVAC assembly further comprises a PTC heater, and the PTC heater is used for heating air flowing through the indoor condenser.

15. The heat pump air-conditioning system according to claim 14 , wherein the PTC heater is disposed on a windward side or a leeward side of the indoor condenser.

16. An electric vehicle, comprising the heat pump air-conditioning system according to claim 1 .

Assignees

• Byd Co Ltd

Inventors

• Tan Tingshuai
• Ye Meijiao
• Chen Xuefeng

Classifications

• F25B41/39 Primary

  Dispositions with two or more expansion means arranged in series, i.e. multi-stage expansion, on a refrigerant line leading to the same evaporator · CPC title

• F25B41/24

  Arrangement of shut-off valves for disconnecting a part of the refrigerant cycle, e.g. an outdoor part · CPC title

• B60H1/22 Primary

  the heat source being other than the propulsion plant {(B60H1/00492 takes precedence)} · CPC title

• F25B41/20

  Disposition of valves, e.g. of on-off valves or flow control valves (expansion valves F25B41/31) · CPC title

• B60H1/00921

  where the flow direction of the refrigerant does not change and there is an extra subcondenser, e.g. in an air duct · CPC title