Pump assembly and high-pressure cleaning apparatus

A high-pressure cleaner comprising a pump assembly, the pump assembly including:

• an electric motor;
• a transmission assembly driven by the electric motor and including a sealing portion, a transmission mechanism received in and sealed by the sealing portion, and lubricated with a lubricating medium injected into the sealing portion, and a heat dissipating portion connected to the sealing portion for transferring heat with the sealing portion;
• a water pump driven by the electric motor through the transmission assembly;
• and
• a water flow passage, the water flow passage comprising a motor water flow passage, a transmission-assembly water flow passage, and a pump water flow passage which are directly connected sequentially,
• wherein the motor water flow passage is provided in the electric motor, the transmission-assembly water flow passage is provided in the heat dissipating portion of the transmission assembly, and the pump water flow passage is provided in the pump, and
• the water flow passage extends from the electric motor, through the heat dissipating portion and to the water pump,
• wherein the sealing portion is disposed to conduct heat with the heat dissipating portion, so that heat generated by the transmission mechanism is transferred through the lubricating medium to the sealing portion and the heat dissipating portion, and dissipated by water passing through the water flow passage extending through the heat dissipating portion.