| 摘要 |
PCT No. PCT/EP94/04310 Sec. 371 Date Feb. 26, 1996 Sec. 102(e) Date Feb. 26, 1996 PCT Filed Dec. 27, 1994 PCT Pub. No. WO95/18337 PCT Pub. Date Jul. 6, 1995In a vehicle heating appliance, water is pumped as heat transfer medium through a heat exchanger that surrounds the combustion chamber. The water pump is mounted above the heat exchanger and pumps the water it axially receives into the heat exchanger through a tangential pump outlet pipe. To vent the pump, a connection hole with a small cross-section is provided in the top area of the pump part of the water pump. The connection hole leads to the system flow pipe. Any air bubbles accumulated in the pump chamber of the pump part reach the flow pipe through the connection hole, propelled by their own ascending force and helped by the geometric arrangement of the pump chamber and return pipe, including the connection hole, and/or additionally by the pressure difference between the pump chamber and the return pipe.
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