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    Thermostatic air flow control device
    6.
    发明授权
    Thermostatic air flow control device 失效
    恒温空气流量控制装置

    公开(公告)号：US3129886A

    公开(公告)日：1964-04-21

    申请号：US20162962

    申请日：1962-06-11

    申请人： RANCO INC

    发明人： JOHN LIEBERMANN

    IPC分类号： F24F3/052 ,  F24F11/76

    CPC分类号： F24F3/0522 ,  F24F11/76 ,  Y10T74/20006

    摘要： 986,219. Valves. RANCO Inc. June 6, 1963 [June 11, 1962], No. 22543/63. Heading F2V. [Also in Division F4] A device for controlling air flow to a space in accordance with temperature comprises thermally responsive power means acting through a lever 34 on a pivoted arm 31 carrying an air flow control baffle 16, the arrangement being such that a restraint on the baffle will not prevent movement of the lever under the influence of the power means. As illustrated, the device is applied to a refrigerator in which air from a cooling unit is supplied through a duct 12 to a food compartment and returns to the cooling unit through a duct 13, the device controlling the air flow from the duct 12. The temperature in the air outlet from the food compartment is sensed by a capillary tube 17 containing a volatile fluid and communicating with a hollow element 55 formed of two dished metal diaphragms. A post 56 mounted on the element 55 bears against a knife edge 57 on the lever 34 to turn it with rising temperature about a triangular fulcrum pin 35 against the bias of a spring 37. The bias of the spring 37 over-rides that of a spring 33 coiled round the pivot 32 of the arm 31 carrying the baffle 16 and having its ends connected to that arm and to the lever 34 so that it biases the arm 31 towards the open position of the baffle and moves it towards that position with rising temperature. Decreasing temperature allows the spring 37 to return the baffle through the lever 34. The temperatures at which the baffle opens and closes may be adjusted by means of a spring adjusting screw 41 and a knob 53 which moves a cam 50 to pivot a lever 43 holding the head of the screw 41. The device may be used in cooling or heating systems for rooms or buildings.