JPS5811319A - Temperature controller in hot air generator - Google Patents

Abstract

PURPOSE:To adjust combustion quantity automatically, by providing a control circuit which keeps a hot air temperature at a set value by an error quantity between a detected temperature and a set temperature and an addition circuit which adds present controlled variable stored by an analog memory to the error quantity. CONSTITUTION:Fuel is supplied by a solenoid pump SP, a temperature of hot air is detected by a temperature detector S and a combustion quantity of a burner is adjusted by a supply quantity of fuel through the solenoid pump SP. The temperature of the hot air is set up by a temperature setting device D. When the temperature of the hot air is varied to a setting temperature an error quantity is transmitted as output of an error amplifier C, which is applied to an inversion adder D. On the other hand, the error quantity is stored in an analog memory AM as a present controlled variable through an inversion instrument IN and added to output of a differential amplifier C, that is, the error quantity. With this, the temperature of the hot air can be kept constant at a setting value by adjusting the combustion quantity automatically without spoiling a stabilized combustion state.

Description

Detailed Description of the Invention The present invention provides a hot air generator that uses an oil burner as a heat source, such as a rotary burner or a bot burner, by automatically adjusting the combustion amount and setting the hot air temperature without impairing a stable combustion state. The present invention relates to a temperature control device that can maintain a constant temperature.

-a- In a hot air generator that uses an oil burner as a heat source, such as a Talibana or a Botburner, the temperature of the hot air can be adjusted,
Temperature control for keeping the hot air temperature constant is performed by adjusting the amount of fuel supplied to the burner and increasing or decreasing the amount of fuel φ.

However, in the Queen oil burner, the liquid fuel is atomized and supplied to the combustion chamber, or it is directly poured onto the combustion dish for combustion. A fuel supply is required, and in particular, rapid fluctuations in the amount of fuel supplied can significantly impair the stability of combustion, so in order to keep the hot air temperature constant, the fuel is simply changed according to the fluctuations in the hot air temperature. It is undesirable to intermittent the supply of fuel or to change the supply amount rapidly, or it may cause combustion to become unstable (therefore, reliable temperature control may not be possible in many cases).

In view of the combustion characteristics of the oil burner, the present invention stores the current control amount in a delayed manner and adds this to the temperature error amount to perform temperature control, thereby maintaining a stable combustion state. The present invention is intended to provide a temperature control device for generating hot air that can control the weight of the air and keep the temperature of the hot air constant at a set value. An example will be described.

FIG. 1 shows a temperature control device for a hot air generator using an oil burner as a heat source. In this figure, S is a temperature detector that detects the temperature of the hot air, and D is a temperature setter that sets the temperature of the hot air.The temperature detector S and the temperature setter are connected to an error amplifier CK. is an inverting adder, and the inverting adder ADK is configured to receive the output of the error amplifier C, and the control output obtained at the output side of the inverting adder AD is the frequency control input of the pump drive circuit DR. Terminal PK is given. SP is an electromagnetic pump for supplying fuel to the burner, and the operation of the electromagnetic pump SP is controlled by a pump drive circuit DR.

Further, AM is an analog memory, and the output of the inverting adder AD is an inverter IN? Intermediate analog memory AM
K is supplied, and the output of the analog memory AM is sent to the buffer amplifier B.
The circuit is configured such that it is applied to the input of the inverting adder AD via P.

Note that the periodic control input terminal T of the pump drive circuit DR is configured to receive the output of the analog memory AM.

Next, the operation of the present invention will be explained.

In the hot air generator, the electromagnetic pump 8PK supplies fuel to the oil burner as the heat source and blows hot air, but the temperature of the hot air is constantly detected by the temperature detector 8, and the burner combustion amount is determined by the electromagnetic pump 8PK. Adjusted by the amount of solvent supplied. The temperature of the hot air to be generated is determined by the temperature setting device DK.
Therefore, set it.

When the temperature of the generated hot air fluctuates with respect to the temperature set by the temperature setter DK, the amount of error in the temperature is sent out as the output of the error amplifier C, and the output is given to the inverting adder AD. On the other hand, the above error amount is stored as an analog memory AMK current control amount via an inverter IN,
The stored current control amount becomes an input to the inverting adder AD via the buffer amplifier BIi'%-, and is added to the output of the error amplifier C, that is, the error amount. Therefore, the frequency control input terminal F or the periodic control input terminal TK of the pump drive circuit DR is given a control output in which the current control amount is added to the error amount with respect to the temperature set value, so that the hot air temperature is less than the set value. Even if it fluctuates, a control signal based on the current control amount is sent to the pump drive circuit DR, and the electromagnetic pump 8
Since the amount of fuel supplied by the PK is controlled based on the signal, the amount of fuel supplied to the burner does not change suddenly, and the temperature of the hot air is kept constant at the set value while maintaining a stable combustion state. The amount of combustion is controlled.

As shown in FIG.
and a capacitor C to provide a kind of slow W% property. In Figure WIJ2, [To explain the control operation, the frequency control input terminal P of the pump drive circuit DB
The output Q of the adder AD given K is Ql ''A-)B if the error is the current control amount QB. Then, when the Ia difference A is zero, the output Q is the current control amount QB. Since the current control amount B is maintained, the fuel supply amount of the electromagnetic pump SP is kept constant 1aK.If an error occurs, the current control amount B is used as a reference. Since the output Q, which is the sum of the output of the error amount A, is delayed and sent out, the electromagnetic pump SP does not suddenly change the amount of fuel supplied, and gradually feeds the fuel without damaging the stable combustion state. The supply amount is controlled and the combustion amount is adjusted to keep the hot air temperature constant at the set value.

Therefore, even if the hot air temperature fluctuates due to external disturbances, such as air volume, outside air temperature, capacity of the electromagnetic pump SP, calorific value of fuel, power supply voltage fluctuations, etc., the temperature of the generated hot air can be maintained in a stable combustion state. It can be controlled reliably.

Incidentally, the periodic control input terminal Tic of the pump drive circuit DR similarly outputs the output Q, which is the sum of the error value and the current control amount B;
is given, so KRjlA is equivalent to frequency control.
Control using K may also be performed.

In short, the present invention provides a temperature sensor S for detecting the temperature of hot air.
and a temperature setting device for setting the temperature of the hot air, and the burner fuel supply electromagnetic pump SP is controlled to set the hot air temperature based on the error amount between the temperature detected by the temperature detector S and the set temperature of the temperature setting device. In addition to providing a control circuit to maintain the value, an analog memory A is provided to store the current control amount based on the error amount.
M is provided, and a circuit for adding the current control amount stored in the analog memory AM to the error amount is formed, so that control can be performed using the error amount based on the stored current control amount. It has the effect of automatically adjusting the combustion amount and keeping the hot air temperature constant at the set value without suddenly changing the amount of fuel supplied by the electromagnetic pump and without damaging the stable combustion state. .

[Brief explanation of drawings]

The drawings show one embodiment of the temperature control device in the hot air generator according to the present invention, and FIG. 1 is a block diagram of its circuit configuration, and FIG. 2 is a block diagram for explaining the operation of the main parts. It is a diagram. S...Temperature detector, D...Temperature setting device, SP...
Fuel supply electromagnetic pump, AM...Analog memory patent applicant Kaneko Agricultural Machinery Co., Ltd. Procedural amendment (voluntary) September 1981
August 8, 1, Display of the case 1982 Patent Application No. 108237 2 Name of the invention Temperature control device 3 in a hot air generator 3 Person who corrects illumination Relationship to the case Patent applicant 2-2 Nishi, Usumi City, Saitama Prefecture .1 No. 1O No. 4, Date of amendment order Voluntary amendment 5, In the specification subject to amendment, "3. Detailed description of the invention" column 6, Contents of amendment

Claims (1)

[Claims] Equipped with a temperature detector that detects the temperature of hot air and a temperature setting device that sets the temperature of the hot air, the burner fuel supply electromagnetic pump is controlled based on the amount of error between the temperature detected by the temperature detector and the set temperature of the temperature setting device. A control circuit is provided to maintain the hot air temperature at a set value, and an analog memory is provided to store the current control amount based on the above error amount, and a circuit is formed to add the current control amount stored according to the analog error amount to the error amount. A temperature control device for a hot air generator characterized by: