| 摘要 |
An appliance, such as a fan, to which it is possible to fit an accessory by using fixing devices, which accessory (17) can be mounted on the appliance so as to change the mode of operation of the appliance. The appliance of the invention is so designed that, by mounting a small accessory, a standard model, e.g. an axial-flow fan, can be converted e.g. into three other generally known fan versions. These are the so-called guide vane, mixed flow and radial flow versions. Traditionally, these are completely separate fans, each requiring separate designing, component manufacture and assembly. In the case of the fan of the invention, these can be achieved with a minimum amount of work. The frame, motor structure and electronics of the fan as well as the frame of the impeller are the same in all these models.
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