Pilot reclamation system for gas-fires forced draft heater
阅读：314发布：2022-11-14
专利汇可以提供Pilot reclamation system for gas-fires forced draft heater专利检索，专利查询，专利分析的服务。并且A pilot reclamation system energizes the combustion air blower of a heater before the pilot flame is completely extinguished from lack of oxygen so that the oxygen supply for the pilot flame is replenished. Sensing means for sensing the temperature of the pilot light is operatively connected to switch means for energizing the combustion air blower. The temperature sensing means includes plunger means which move the switch means to close a circuit for the blower motor when the temperature of the pilot light falls below a predetermined level. When the oxygen supply to the pilot light is replenished and the temperature of the pilot light rises above a predetermined level, the temperature sensing means allows the switch to move to the open position.，下面是Pilot reclamation system for gas-fires forced draft heater专利的具体信息内容。
1. A pilot reclamation system for a gas-fired forced draft heater having burner means, a pilot light adjacent the burner means for igniting the burner means, an air blower for supplying combustion air to the burner means, the air blower having an electric blower motor, and a circuit for supplying electric current to the blower motor, the pilot reclamation system comprising means for sensing the temperature of the pilot light, switch means associated with the temperature-sensing means, the temperature-sensing means moving the switch means to close said circuit when the temperature of the pilot light falls below a predetermined level and moving the switch means to open said circuit when the temperature of the pilot light rises above a predetermined level whereby the air blower supplies air to the area of the burner means when the temperature of the pilot light falls below a predetermined level.
2. The system of claim 1 in which the switch means is an electrical switch having open and closed positions, the temperature-sensing means including movable plunger means for mechanically moving the switch between the open and closed positions.
3. The system of claim 1 in which the heater is equipped with a fuel valve for supplying fuel to the burner means, the temperature-sensing means being associated with the fuel valve and including movable retaining means movable in response to the temperature of the pilot light, shut-off means on the fuel valve movable between an open position in which fuel may flow to the burner means and a closed position in which fuel is shut off from the burner means, the shut-off means being biased to the closed position and being maintained in the open position by the retaining means when the pilot light is lit, the retaining means being movable to release the shutoff means when the pilot light goes out whereby fuel flow to the burner means is shut off, the switch means being an electrical switch having open and closed positions, lever means engaging the retaining means for movement therewith, the lever means closing the switch before the retaining means releases the shut-off means.
4. The system of claim 3 in which the lever means is adjustable to vary the distance which the retaining means moves before the switch is closed.
5. The system of claim 3 in which the retaining means includes a reciprocably mounted plunger movable between extended and retracted positions and a first lever arm pivotally mounted on the fuel valve and movable between first and second positions, the first lever arm being biased toward the first position, the plunger being engageable with the first lever arm as the plunger moves from the retracted to the extended position to move the first lever arm from the first to the second position, the first lever arm maintaining the shut-off means when the first lever arm is moved to the first position, said lever means for closing the switch including a second lever arm pivotally mounted on the fuel valve and engaging the first lever arm so that the second lever arm is moved by the first lever arm as the first lever arm moves from the first to the second position, the second lever arm maintaining the switch in the open position when the first lever arm is in the second position, the second lever arM permitting the switch to close as the first lever arm moves from the second position toward the first position.
6. Pilot reclamation means for a fuel valve for supplying fuel to a fuel burner, the fuel valve having; a. shut-off means movable between open and closed positions and being biased toward the closed position, b. retaining means movable between a first position and a second position and being biased toward the first position, the retaining means being engageable with the shut-off means when the retaining means is in the second position to maintain the shut-off means in the open position and releasing the shut-off means when the retaining means moves toward the first position to close the shut-off means, c. temperature-sensing means associated with the retaining means and adapted to sense the temperature of a pilot light, the temperature-sensing means including means for moving the retaining means toward the second position as the temperature of the pilot light increases, the retaining means being in the first position when the pilot light is out whereby the retaining means maintains the shut-off means open when the pilot light is lit and permits the shut-off means to close when the pilot light goes out, the pilot reclamation means comprising d. a switch mounted on the fuel valve and adapted to be connected to the motor of a combustion air blower for the fuel burner, the switch having a switch element movable between open and closed positions, e. a switch arm pivotally mounted on the fuel valve and being engageable with the switch element, the switch arm being engaged by the retaining means when the retaining means is in the second position whereby the switch element is maintained in the open position by the switch arm, movement of the retaining means from the second position to the first position permitting movement of the switch arm, movement of the switch arm permitting the switch element to move to the closed position before the retaining means reaches its first position whereby the motor of the combustion air blower will be energized before the pilot light goes out.
7. The structure of claim 6 in which the switch element is biased toward the closed position.
8. The structure of claim 6 in which the retaining means includes a reciprocably mounted plunger movable between extended and retracted positions and a lever arm pivotally mounted on the fuel valve and movable between first and second positions, the lever arm being biased toward the first position, the plunger being engageable with the lever arm as the plunger moves from the retracted to the extended position to move the lever arm from the first to the second position, the lever arm maintaining the shut-off means in the open position when the lever arm is in the second position and releasing the shut-off means when the lever arm is moved to the first position to permit the shut-off means to move to the closed position, the switch arm engaging the lever arm and being movable therewith to open and close the switch.
9. The structure of claim 6 including adjusting means for varying the distance which the switch arm must move before the switch element is moved from the open position to the closed position.
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