Stoves and furnaces – Liquid heater – Open-top vessel that may include lid
Reexamination Certificate
2000-07-10
2001-08-07
Yeung, James C. (Department: 3743)
Stoves and furnaces
Liquid heater
Open-top vessel that may include lid
C126S351100, C099S331000, C099S403000
Reexamination Certificate
active
06269808
ABSTRACT:
BACKGROUND OF THE INVENTION
TECHNICAL FIELD RELATED TO THE INVENTION
The present invention relates to a liquid heating cooker (such as a deep fat fryer or a noodle boiler) equipped with a burner as a heat source for mainly industrial use.
PRIOR ART
Industrial fryers and noodle boilers have been used for cooking foods (fried or boiled stuffs) each having a burner as a heat source. The burner is provided for heating a cooking liquid to be prepared in a vat or frypot using heat supplied from a combustion chamber or a heat exchanger via an exhaust passage. Before initiating or restarting the burner, a pre-purging process is required for exhausting from the combustion chamber and exhaust passage. For example, when a fryer is equipped with a pulse burner which repeats a cycle of combustion of a mixture of gas and air in its combustion chamber and its non-operating period before the ignition is extended, a small amount of the gas leaked out from an electromagnetic valve provided for supply of the gas may be accumulated. As the exhaust system is considerably large in size, care should be taken for avoiding no accidental combustion of the accumulated gas. For the purpose, a pre-purging process is commonly carried out for about 80 seconds. When the non-operating period from the stop to the restarting is relatively short, the pre-purging process may be as quick as substantially 5 seconds.
However, before oil in a frypot of the fryer is cleaned by filtering, the main run switch has to be turned off to avoid burning without the oil. After the filtering, the switch is turned on to restart the operation. This is followed by pre-purging for 80 seconds even if the duration of the filtering is short and thus delaying the operation. The applicant of the present invention presented an invention of a system including a combustion interrupting switch for temporarily stopping the combustion in the pulse burner with the main run switch being turned on so as to shorten the pre-purging process after the filtering and allow quick start of the operation, as disclosed in Japanese Utility Model No.2581722.
PROBLEMS THAT THE INVENTION IS TO SOLVE
The installation of such a combustion interrupting switch raises the overall production cost and the separately installed combustion interrupting switch itself is troublesome to be operated. Also, if the on/off operation of the combustion interrupting switch is not performed properly, the combustion may accidentally start during the filtering or may not be started after the filtering.
With the combustion interrupting switch, when the power supply for the fryer is interrupted e.g. by blackout, even the duration of the blackout is short, the pre-purging for the long period will be carried out after the power supply is recovered, hence impairing the utility of the fryer.
As defined in claims
1
and
2
, the present invention is directed towards a liquid heating cooker which can select a desired length of the pre-purging with no use of the combustion interrupting switch, thus lowering the production cost and improving the operability. Means for solving the Problems
For achievement of the object of the present invention, as defined in claim
1
, the period of pre-purging is varied corresponding to the time elapsing from the previous cancellation of the combustion.
Also, for achievement of the object of the present invention, as defined in claim
2
, the period of pre-purging is varied corresponding to the drop down of the temperature of a cooking liquid.
REFERENCES:
patent: 4628903 (1986-12-01), Farnsworth
patent: 5220864 (1993-06-01), Ejiri et al.
patent: 5379683 (1995-01-01), Ejiri et al.
patent: 5386815 (1995-02-01), Ejiri et al.
patent: 2581722 (1998-07-01), None
Paloma Industries Limited
Pearson & Pearson LLP
Yeung James C.
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