Exhaust heat regeneration system

An exhaust heat regeneration system, comprising:

• an evaporator to cool engine cooling water by heat exchange with a refrigerant;
• an expansion device to expand the refrigerant heated through the evaporator so as to generate a driving force;
• a condenser to cool the refrigerant that has passed through the expansion device to condense the refrigerant;
• and
• a pump to pressure-feed the refrigerant cooled through the condenser to the evaporator, wherein:
• the expansion device is coupled to the pump by a shaft, and the expansion device and the pump are housed within the same casing to constitute a pump-integrated expansion device;
• the pump comprises a low-pressure chamber through which the refrigerant flowing from the condenser flows, the low-pressure chamber limited to an expansion device side of the casing, which is a side of the casing in an axial direction of the shaft that includes the expansion device,
• wherein the pump is a gear pump that further comprises a gear section provided on a side of the casing that is opposite to the expansion device side of the casing in the axial direction with the low-pressure chamber limited to a space between the gear section and the expansion device in the axial direction, to boost the refrigerant.

An exhaust heat regeneration system, comprising:

• an evaporator to cool engine cooling water by heat exchange with a refrigerant;
• an expansion device to expand the refrigerant heated through the evaporator so as to generate a driving force;
• a condenser to cool the refrigerant that has passed through the expansion device to condense the refrigerant;
• and
• a pump to pressure-feed the refrigerant cooled through the condenser to the evaporator, wherein:
• the expansion device is coupled to the pump by a shaft, and the expansion device and the pump are housed within a same casing to constitute a pump-integrated expansion device;
• and
• the pump comprises:
• a high-pressure chamber through which the refrigerant to be discharged to the evaporator flows, the high-pressure chamber limited to an expansion device side of the casing, which is a side of the casing in an axial direction of the shaft that includes the expansion device, and limited to a first space between moving parts of the pump and the expansion device in the axial direction;
• and
• a low-pressure chamber through which the refrigerant flowing from the condenser flows, the low-pressure chamber limited to a side of the casing that is opposite to the expansion device side in the axial direction with the high-pressure chamber and the first space provided between the low pressure chamber and the expansion device in the axial direction, and the low-pressure chamber limited to a second space that is past the first space in the axial direction away from the expansion device.