Outdoor unit and heat pump system

A heat pump system comprising:

• an outdoor unit including:
• a compressor, a mode switch valve assembly, an outdoor heat exchanger having a refrigerant inlet and a refrigerant outlet connected through pipelines, and a first pipeline port and a second pipeline port for docking with an indoor unit;
• a first branch that connects the mode switch valve assembly and the first pipeline port, wherein the first branch is provided with the outdoor heat exchanger and a first switch valve assembly disposed on the refrigerant inlet side;
• a second branch that connects the mode switch valve assembly and the first pipeline port, wherein the second branch is provided with a second switch valve assembly and is connected in parallel with the outdoor heat exchanger;
• a third branch that connects the second pipeline port and the refrigerant inlet of the outdoor heat exchanger;
• wherein, the first switch valve assembly and the second switch valve assembly are configured to control the on and off of the first branch and the second branch when the mode switch valve assembly arbitrarily switches the refrigerant flow direction, so that the refrigerant flows through the refrigerant inlet and the refrigerant outlet of the outdoor heat exchanger in sequence;
• an indoor unit having indoor heat exchangers and throttle assemblies connected through pipelines, and a third pipeline port and a fourth pipeline port for docking with the outdoor unit;
• a heat exchange scheduling unit having a seventh switch valve assembly and an eighth switch valve assembly connected in parallel, and a plurality of three-way valve assemblies;
• wherein, each of the three-way valve assemblies is connected to the second pipeline port, the third pipeline port, and the first pipeline port, respectively;
• the first end of the seventh switch valve assembly is connected to the fourth pipeline port, and the second end of the seventh switch valve assembly is connected between the plurality of three-way valve assemblies and the first pipeline port;
• and
• the first end of the eighth switch valve assembly is connected to the fourth pipeline port, and the second end of the eighth switch valve assembly is connected between the plurality of three-way valve assemblies and the second pipeline port.