a heat exchanger, comprising an external inlet opening, an external outlet opening, an internal inlet opening and an internal outlet opening;

an external cooling loop, comprising an external inlet pipe and an external outlet pipe, wherein an external cooling fluid flows into the external inlet opening from the external inlet pipe, and passes through the heat exchanger to further flow out of the external outlet opening to the external outlet pipe;

an internal cooling loop, comprising an internal inlet pipe and an internal outlet pipe, wherein an internal cooling fluid flows into the internal inlet pipe from the server, and further flows into the internal inlet opening from the internal inlet pipe, and passes through the heat exchanger to perform a heat exchange with the external cooling fluid to flow out of the internal outlet opening to the internal outlet pipe;

a first hot-swap pump, comprising a first pump main body, a first inlet anti-leakage pipe, a first outlet anti-leakage pipe and a first hot-swap connector, wherein the first inlet anti-leakage pipe and the first outlet anti-leakage pipe communicate with the first pump main body, the first inlet anti-leakage pipe comprises a first inlet connector and a first inlet anti-leakage valve arranged in the first inlet connector, the first outlet anti-leakage pipe comprises a first outlet connector and a first outlet anti-leakage valve arranged in the first outlet connector, and the first hot-swap connector is electrically connected to the first pump main body; and

wherein the internal cooling fluid flows out of the internal outlet opening and flows into the first inlet connector and further passes through the first inlet anti-leakage valve to enter the first pump main body, and the internal cooling fluid flows out of the first pump main body and flows into the first outlet connector and further passes through the first outlet anti-leakage valve to enter the server.