A combustion control device capable of detecting a self-discharge state caused by a failure of an ultraviolet ray detecting tube by interrupting flames from a combustion mechanism to an ultraviolet ray detecting tube by opening and closing a shutter, integrating, by an integrating circuit, detection signals from this ultraviolet ray detecting tube only when the shutter is closed, comparing the result of this integration with a preset judgement level by use of a first judgement circuit, and determining a failure by comparing a result of this comparison with a preset failure judgement frequency by use of a second judgement circuit, thereby improving maintainability.

Combustion control device

A magnetic layer is formed on a non-magnetic substrate through a non-ferromagnetic layer. This non-ferromagnetic layer contains spherical, non-ferromagnetic fine granular iron oxide. Alternatively, it contains non-structural carbon having a mean grain size of 10 to 60 nm, a specific surface area of up to 150 cm2/g by a BET method and a DBP oil absorption quantity of up to 100 ml/100 g in addition to, or in place of, this iron oxide. In this way, a magnetic recording medium having excellent surface property and electromagnetic conversion characteristics can be accomplished.

Magnetic recording medium.

PURPOSE:To prevent the bias of thrust cord during cutting period by providing a chucking means for rotary blades for a steel cord slitter having paired rotary blades in which the sides of the blades slightly and mutually lap and contact with the other CONSTITUTION:A steel cord S1 charged is clutched by two pairs of belts and advanced, and when passing through cutting blades 20 and 21, the steel cord S1 is cut into a given width of a steel belt S2 and then hung down through a curved guide plate 52 Since steel wires constituting the steel cord S1 are ar ranged at a low angle to the longitudinal direction of the steel cord S1, a strong widthwise thrust acts on the steel cord S1 by the cutting blades 20 and 21 during the cutting period, but the steel cord S1 is advanced while being strongly clutched by endless belts 45, 46, 47, and 48 Thus, no widthwise variation of the steel cord by the thrust occurs

Steel cord slitter

Forcept for extracting crystal

PURPOSE:To quickly detect a trouble when abnormal ignition is effected or flame is spontaneously extinguished, by a method wherein an ignition circuit motion signal from an ignition circuit and a combustion detecting signal, by means of which combustion in a combustion part is detected, are simultaneously monitored CONSTITUTION:When, although normal ignition motion is effected and ordinary combustion is started once, failure in ignition occurs in the middle of the progress of combustion due to some causes, despite of that, as shown by a point (f), theory ''H'' is consecutively held by means of a fuel feed signal S5, ie, despite of that fuel is continued to be fed, flame is half-burnt, a flame detecting signal S3 is fallen to ''L'' as shown by a point (g) When a desired motion is not made by means of an ignition circuit 3 despite of that an ignition instruction is issued, a fuel valve opening signal S2 is sent to a fuel valve control circuit 4 as shown by a point (k), said circuit receives the signal to conduct a regular motion A fuel valve is opened to start the feed of fuel, and even if the fuel feed signal S5 is provided as shown by a point l, an ignition circuit motion signal is, as shown by a point (m), brought into a condition in which the signal is left to be the theory ''L''

Monitoring circuit for combustion device

PURPOSE: To restrict an overshoot to be caused at a rapid decrease of water supply amount by the additional provision of an overshoot judging circuit in a proportional control system included in the combustion control device of the proportional control system which carries out the control based on the temperature of water. CONSTITUTION: In the combustion control device of the proportional control system including a water temperature detector which provide a signal representing the detected value, a PID control circuit which includes a common integrating circuit comprising an OA amplifier 41 and the like and receives the signal from the detector, and a fuel supply means which determines the amount of fuel supply based on the output from the PID control circuit and supplies the fuel accordingly, a circuit for detecting an overshoot occurrence of the water temperature is provided which fanctions in accordance with the water temperature detection signal. In such a construction, if the water supply rate W o rapidly decreases to W 2 , a thermister 6 detects this decrease after a short period, And when the detected value exceeds an overshoot judging temperature, the overshoot judging circuit reverses to compulsively make an unreversible input of the OA amplifier 41 to be of a low level. Accordingly, the current flowing through a proportional valve 3 is decreased to such a value as to allow the amount of gas at the necessary minimum. COPYRIGHT: (C)1982,JPO&Japio

PURPOSE:To obtain a favorable combustion condition at all times by controlling the quantity of air blast by a method wherein the phase and the number of revolutions of a fan motor is controlled in proportion to the value of a proportional valve driving current, in the titled combustion control apparatus for a gas burner provided with a proportional valve. CONSTITUTION:The combustion control apparatus for the gas burner such as instantaneous gas hot water heater having the proportional valve 13 is provided with a load circuit on the primary side, and control circuits on the secondary side, of a power source transformer T. The load circuit includes the fan motor 26 the number of revolutions of which is controleed through a phase control circuit and the phase control circuit is controleed by a fan motor speed control circuit at the time when relay Xw is ON. The proportional valve 13 is controled by the output of a PID control circuit based on the difference between the temperature of hot water detected by a thermister 18 and a temperature set by a variable resistor VR, through a valve drive circuit. In this case, the fan motor speed control circuit is controlled in proportion to the value of the proportional valve driving current.

Masanori Matsumoto

Papers

Combustion control device

Combustion control apparatus