Fire failure safety control for stokers

Patent · Tue Jul 08 04:00:00 EDT 1986

OSTI ID:5396257

D'Angelo, J T

This patent describes a heating system including a stoker-fed furnace, a safety control for preventing operation of the stoker motor in the event of insufficient combustion if the furnace consisting of: (a) thermostatic switch means for energizing and deenergizing the motor, (b) time delay means including normally closed contacts in circuit with the thermostatic switch means and the motor, (c) heat sensitive switch means including normally closed contacts in the energizing circuit for the relay means, (d) the heat sensitive switch means being located at a position in the system subject to exposure to heat emanating from the furnace and being adapted to open its the normally closed contacts in response to increase in the heat above a predetermined value which is representative of sufficient fire in the furnace to maintain standby combustion therein and thereby to maintain the relay deenergized and the contacts thereof closed, and (e) the time delay relay means being adapted to maintain the normally closed contacts thereof closed for a sufficient time interval after being energized for combustion in the furnace to increase the heat at the position from standby conditions to the predetermined value.

• Assignee: NOV; EDB-86-151928; NOV-85-017681
• Patent Number(s): US 4598648
• OSTI ID: 5396257
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
421000* -- Engineering-- Combustion Systems
COMBUSTION CONTROL
CONTROL
CONTROL EQUIPMENT
CONTROL SYSTEMS
ELECTRIC CONTACTS
ELECTRIC MOTORS
ELECTRICAL EQUIPMENT
ELECTRONIC CIRCUITS
ENERGY SYSTEMS
ENGINEERED SAFETY SYSTEMS
EQUIPMENT
FIRES
FUEL FEEDING SYSTEMS
FUEL SYSTEMS
FURNACES
HEATING SYSTEMS
MOTORS
RELAYS
STOKERS
SWITCHES
THERMOSTATS
TIMING CIRCUITS