KR910002733B1 - Combustion device - Google Patents

Abstract

The combustion device having a proportional control valve changes opening ratio of the valve and a setting position of the valve by characteristic hysterisis of for example a spring, contact resistance, amount of the surplus. The proportional control valve has always a constant opening ratio in identical amount with the electric current of the coil, which consists of a valve assembly (44b) placed through circular hole (44a) in gas supply passage (3) and having projected conical shaped (44b) both sides, a main spring (44d) for pressing each of the side with interlocking elements (44c) of the valve assembly, a driving coil (44f) with amateur (44e) interlocking with the valve assembly (44b).

Description

Combustion device

1 is an electronic circuit diagram of a proportional valve control circuit.

2 is a schematic diagram of a stove.

3 is a sectional view of the proportional control valve.

4 is a graph showing the hysteresis characteristics of the proportional control valve.

5 is a block diagram of an electronic controller.

* Explanation of symbols for main parts of the drawings

1: gas stove 2: burner

5: electronic control unit 6: thermal control circuit

7: Proportional valve current conversion circuit 8: Proportional valve driving circuit

9 pulse generating circuit 44 proportional control valve

44b: valve body 44d: juice spring

44f: coil

The present invention relates to a combustion apparatus having a proportional control valve.

The proportional control valve used in this type of device is a valve body or a member interlocked with the valve body is biased by a spring at least on one side, and the armature linked with the valve body moves the valve body by varying the amount of energization of the coil. The opening degree was set. Since the proportional control valve has the above structure, for example, the position where the valve body is set by hysteresis characteristics such as spring, sliding resistance, and margin amount when increasing or decreasing the amount of energization to the coil. Is different and the opening degree of the proportional control valve is different even at the same amount of energization.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object thereof is to provide a combustion apparatus which can always have a constant opening degree at the same energization amount by using a proportional control valve having hysteresis characteristics.

In order to achieve the above object, the present invention has a valve body that is displaced by a spring load by a spring and an electromagnetic force by the amount of energization to the coil, and a proportional control valve that controls the amount of fuel supplied according to the amount of energization to the coil. In the combustion apparatus provided with the apparatus, the opening degree of the proportional control valve is set by only one of the increase or decrease in the amount of current supplied to the coil, and the other side can be used during the increase or decrease in the amount of current supplied to the coil. In this case, the technical means is to set the opening degree by energizing by the other side and releasing the hysteresis characteristic once by energizing the other side.

According to the present invention having the above-described configuration, when the opening degree of the proportional control valve is changed to change the combustion amount of the combustion device, only one of the increase or decrease in the amount of current supplied to the coil is applied. In the case of using the other of increasing or decreasing, the opening of the proportional control valve is set by opening the current by the other side and releasing the hysteresis characteristic, and then setting the opening degree by energizing by one side. Regardless of the hysteresis characteristic, a predetermined aperture is always obtained with a predetermined amount of energization. Thereby, when changing the opening degree of a proportional control valve, it can always set to the combustion amount desired by a user.

Next, the combustion apparatus of the present invention will be described based on the embodiment shown in the drawings.

2 is a schematic diagram of a gas stove to which the present invention is applied. The gas stove 1 heats and cooks food and the like placed on the gas burner 2 by the flame of the gas by the gas burner 2. And the gas burner 2 is connected with the gas supply path 3 which supplies the gas which is fuel.

The gas supply passage 3 is provided on an upstream side and provided with a main valve 41 which is opened and closed by non-energization, a safety valve 42 disposed downstream of the main valve 41 and closed when sensing misfire, It is provided downstream of this safety valve 42, and is provided in the governor valve 43 which adjusts the pressure of the supplied gas, and downstream of the governor valve 43, and the opening degree changes with the amount of energization. It is provided in the control valve 44 and the bypass passage 31 which bypasses the proportional control valve 44, and the gas burner is located upstream of the proportional control valve 44 regardless of the open / closed state of the proportional control valve 44. A flow rate adjustment screw 45 for flowing a gas of a predetermined direction to (2), and an ignition nozzle 32 for supplying a predetermined amount of gas to the vicinity of the crater of the gas burner 2 from upstream of the proportional control valve 44. It is provided. The main valve 41, the safety valve 42, and the proportional control valve 44 are energized and controlled by the electronic controller 5 described later.

As shown in FIG. 3, the proportional control valve 44 penetrates and is disposed in a circular hole 44a provided in the gas supply passage 3, and has a valve body 44b having a protruding cone shape above the drawing. The juice spring 44d which always adds the interlocking member 44c of this valve body 44b to upper drawing, the armature 44e which cooperates with the valve body 44b, and the drive coil 44f of this armature 44e. ).

Since the proportional control valve 44 has such a structure, as shown in FIG. 4, when increasing and decreasing the energization amount V to the drive coil 44f, it is downstream of the proportional control valve 44. As shown in FIG. The generated nozzle pressure Pm has hysteresis characteristics. 44 g and 44 h shown in the figure also show an adjustment compression coil spring and an adjustment screw for adjusting the force of the juice spring 44d.

As shown in the block diagram of FIG. 5, the electronic controller 5 interlocks with the operation switch 51a for setting the ignition and the fire extinguishing, and supplies the 100 V AC current supplied to the general household. In conjunction with the power supply circuit 51 for converting to a direct current of a constant voltage used in the operation and the thermal power control switch 52a for setting the thermal power of the gas stove 1, control of the amount of energization of the proportional control valve 44 is controlled. The combustion state of the flame by the output of the proportional valve control circuit 52 to be performed, the display circuit 53 for displaying the setting state of the thermal power to the user, and the thermocouple 54a positioned above the ignition nozzle 32 The flame detection circuit 54 for detecting the light, the spark drive circuit 55 for making a call by the spark electrode 55a positioned above the ignition nozzle 32, and the output of the flame detection circuit 54. If abnormal combustion is detected, the safety valve 42 is turned off and the gas stove 1 is And the abnormal combustion detection circuit 56 to stop the combustion, consists of a lighting shear constructs circuit 57 for controlling the circuit.

Next, an embodiment of the electronic circuit of the proportional valve control circuit 52 will be described with reference to FIG.

The proportional valve control circuit 52 is composed of a thermal power control processing circuit 6, a proportional valve current converting circuit 7, a proportional valve driving circuit 8, and a pulse generating circuit 9.

The thermal power control processing circuit 6 includes a signal generator 61 having an automatic return type thermal power control switch 52a operated by a user, and a decoder for converting the output signal of the signal generator 61 ( 62). The signal generator 61 is composed of a thermal power control switch 52a, resistors 63, 64, and a condenser 65, and five sets are provided so that the thermal power can be set in five stages.

The proportional valve current conversion circuit 7 is a latch circuit and holds and outputs the signal input from the decoder 62 until a new input signal is input.

The proportional valve driving circuit 8 is composed of a current value setting section 81, a multiplexer 82, and a proportional valve driving section 83. The current value setting section 81 is composed of a constant resistor 84 and a variable resistor 85, and five sets are provided in accordance with the thermal power control switch 52a, respectively. The multiplexer 82 outputs the current value set by the current value setting section 81 in accordance with the signal input from the proportional valve current conversion circuit 7.

The proportional valve driving unit 83 passes the output set by the multiplexer 82 through the constant current circuit 86 having the op amp 86a and the transistor 87 and the coil 44f of the proportional control valve 44. Will be delivered to

The pulse generating circuit 9 receives the output of the decoder 62 and operates the thermal power control switch 52a to generate a predetermined time Hi, and a monostable multivibrator 91 and a NOT circuit for inverting the output. And an AND circuit 93 connected to each input terminal of the multiplexer 82 and inputting the output of the current conversion circuit 7 and the output of the NOT circuit 92. As a result, the input of each input terminal of the multiplexer 82 becomes low for a predetermined time when the thermal power control switch 52a is operated, and the output of the multiplexer 82 becomes the current value at the maximum combustion.

In addition, the energization amount of the proportional control valve 44 to the coil 44f at the time of maximum combustion in this embodiment shall be set to A which has no imbalance by hysteresis characteristic as shown in FIG.

In the present embodiment as described above, whenever the user changes the thermal power of the gas stove 1 by operating the thermal power control switch 52a, the pulse generator circuit 9 makes a coil (one time) by changing the thermal power. The amount of energization to 44f) is set to A so that the opening degree of the proportional control valve 44 is set to the opening degree at the maximum combustion.

Then, the energization amount corresponding to the combustion amount set by the thermal power control switch 52a is supplied to the coil 44f by the thermal power control processing circuit 6, the proportional valve current converting circuit 7, and the proportional valve driving circuit 8. do. Therefore, the opening degree of the proportional control valve 44 always sets the predetermined opening degree according to the setting state of the thermal power control switch 52a irrespective of the hysteresis characteristic.

In the above embodiment, the hysteresis is always released when the opening degree of the proportional control valve is changed, and then the energization amount of the proportional control valve is set to the energization value at the maximum combustion and then the desired energization amount is shown. However, it may be set to the desired energization amount after setting the energization amount at the time of minimum combustion.

When the opening degree of the proportional control valve is changed, the amount of hysteresis that is released may be set to the desired amount of energization after energizing the coil. In the case of either increasing or decreasing the amount of current supplied to the coil that is not affected by the hysteresis characteristic even if the current value is directly set to the desired current amount, the current is directly set to the desired current amount and the current is applied to the coil affected by the hysteresis characteristic. Only in the case where the whole quantity is increasing or decreasing, the energization amount of the proportional control valve may be set to the desired energization amount so that hysteresis is released once.

Moreover, you may apply this invention to other combustion apparatuses, such as a heating apparatus and a water heater other than a gas stove. Moreover, although the example which used gas as fuel was shown, you may apply to the combustion apparatus which uses kerosene etc. as a fuel.

Claims (3)

A proportional control valve 44 having a spring load by a spring and a valve body 44b displaced by an electromagnetic force corresponding to the amount of energization to the coil, and controlling the amount of fuel supplied according to the amount of energization of the coil 44f; In the combustion apparatus provided, the opening degree of the proportional control valve 44 is set by only one of the increase or decrease of the energization amount of the coil in changing the thermal power, and the increase or decrease in the energization amount of the coil. In the case of using the other of decreasing, the combustion apparatus characterized by setting the opening degree by energizing the coil current amount set by the said other side once, canceling the hysteresis characteristic, and energizing the target control amount by said one side. . The combustion apparatus according to claim 1, wherein when the amount of energization of the coil is changed, one end is always changed to a desired amount of energization after setting the predetermined value with less unbalanced dispersion by hysteresis. 3. The combustion apparatus according to claim 2, wherein the predetermined opening degree is set by setting the amount of current supplied to the coil to the amount of current supplied at the maximum combustion or the amount of current supplied at the minimum combustion.

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