Heat exchanger for vehicle air conditioning system, vehicle air conditioning system and vehicle

A heat exchanger for a vehicle air conditioning system, comprising:

• a heat exchanger body, provided with an air-inlet side and an air-outlet side, wherein the air-inlet side is configured to enable an external air flow to enter the heat exchanger body, so that the air flow conducts heat exchange with a refrigerant in the heat exchanger body, and the air-outlet side is configured to exhaust the air flow to a passage compartment of the vehicle, completing heat exchange with the refrigerant;
• a water storage tank, arranged below the heat exchanger body and configured to store condensate water formed on the heat exchanger body;
• and
• a condensate water circulating device;
• wherein the condensate water circulating device comprises:
• a water cooler arranged on the air-inlet side of the heat exchanger body, configured to cool the air flow using the condensate water before the air flow entering the heat exchange body;
• and
• a water pump configured to transport the condensate water stored in the water storage tank to the water cooler;
• wherein the heat exchanger further comprises a liquid level sensor and a controller, the liquid level sensor and the water pump both are electrically connected to the controller, the liquid level sensor is arranged in the water storage tank and is configured to detect a liquid level height of the condensate water in the water storage tank, and the controller is configured to start the water pump in a case where the liquid level height of the condensate water in the water storage tank reaches a preset value;
• wherein the heat exchanger further comprises a catchment tray, and the catchment tray is arranged at a bottom of the heat exchanger body, is configured to collect the condensate water formed on the heat exchanger body, and is communicated with an internal space of the water storage tank;
• and
• wherein the catchment tray is further located at the bottom of the water cooler and is further configured to collect the condensate water formed on the water cooler.