| 摘要 |
The invention has for its object to provide a control unit for the air choke in an oil burning installation which affords good fuel economy and is simple in construction, while being at the same time easy to mount and adjust. The control unit is composed of a piston cylinder (14) the pressure side of which is connected to the pressure side of the fuel pump (22) of the plant in such a manner that its piston (24) performs a working stroke when the pump starts and returns to the starting position when the pump stops. The piston rod (18) of the piston cylinder unit is coupled to a throttle which opens as a result of said working stroke and closes on the return movement. The piston cylinder unit is provided with a mobile end position abutment which consists of a secondary piston (29) which is slidably mounted in a secondary cylinder housing (30) which communicates with a sensing device (33) disposed in or adjacent the flue gas duct of the burning plant, which sensing device encloses an expansion liquid, the degree of expansion of which depending upon temperature determines the displacement position of the secondary piston and thus of the end position abutment, and also the reduction of the degree of opening of the throttle on increased flue gas temperature, and vice-versa. |
