초록 ▼

A temperature controlled probe assembly (58) for measuring log temperatures in a furnace (10) for heating metal logs (20) includes a carriage (88) selectively movable by a pneumatically controlled air cylinder (64). The carriage (88) includes a barrel (92) having an air chamber (102), a pair of ther

A temperature controlled probe assembly (58) for measuring log temperatures in a furnace (10) for heating metal logs (20) includes a carriage (88) selectively movable by a pneumatically controlled air cylinder (64). The carriage (88) includes a barrel (92) having an air chamber (102), a pair of thermocouple probe rods (40, 42) extending through the barrel (92), and cooling air channels (126) opening into the air chamber (102) for supplying air to cool the probes (40, 42). Another thermocouple (94) measures the temperature of the environment surrounding the thermocouple probe rods (40, 42) and a cooling air regulator (160) is selectively actuated when the temperature of the probe environment is greater than a predetermined temperature. The regulator (160) varies the amount of cooling air supplied to the probe rods (40, 42) in accordance with the amount of combustion air being used by the furnace (10).

대표청구항 ▼

In a furnace for heating articles to an elevated set point temperature and comprising a heating chamber through which the articles are moved, combustion means for generating and applying thermal energy within the heating chamber to heat the articles, combustion air supply means for supplying air to

In a furnace for heating articles to an elevated set point temperature and comprising a heating chamber through which the articles are moved, combustion means for generating and applying thermal energy within the heating chamber to heat the articles, combustion air supply means for supplying air to the combustion means, and thermocouple probe means including thermocouple probe rods for contacting the articles and measuring the temperature of the articles so as to regulate the energy applied to the articles by the combustion means, the improvement which comprises: environmental temperature measuring means for measuring the temperature of the environment surrounding the thermocouple probe rods or the temperature of the actual thermocouple probe rods, and for generating an environmental temperature signal representative of the measured environmental temperature; cooling air supply means responsive to the environmental temperature signal for selectively supplying cooling air to the thermocouple probe rods in accordance with the difference between the environmental temperature and a predetermined temperature; and the cooling air supply means comprises regulator means for adjusting the flow of supplied cooling air to the thermocouple probe rods in accordance with the rate of air flow through the combustion air supply means.