JPH0759975B2 - Combustion device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a combustion device that supplies gas to a burner and burns it.

[Prior Art] The solenoid valve is opened for a certain time from the start of ignition operation,
2. Description of the Related Art Combustion devices have been known in the related art in which if the ignition of a burner can be detected, the open state of the solenoid valve is continuously maintained, and if it cannot be detected, the solenoid valve is closed.

Further, in the case of a gas instantaneous water heater, etc. in which the user freely sets the combustion amount of the burner from a large combustion amount (large gas supply amount) to a small combustion amount (small gas supply amount), the fixed time is , It is set to be short based on the large amount of combustion so that it does not explode and ignite even when raw gas accumulates.

[Problems to be Solved by the Invention] However, in the conventional combustion apparatus, if an attempt is made to ignite a small combustion amount with a small gas supply amount, it is difficult to ignite because a certain period of time is too short. However, there is a drawback that ignition is difficult when there is.

An object of the present invention is to provide a combustion device in which a burner ignites safely and reliably regardless of whether the gas supply amount is small or large.

[Means for Solving the Problems] In order to achieve the above object, the present invention provides a solenoid valve that is opened by energization in a gas supply path that supplies gas to a burner, and starts ignition operation to the burner from the start. In the combustion apparatus in which the solenoid valve is forcibly opened and held for a predetermined time, the predetermined time is set to be shorter as the gas supply amount increases.

[Operation and Effect of Invention] (Operation) When the amount of gas supplied to the burner is small, the solenoid valve disposed in the gas supply passage has a long forced valve opening holding time. Therefore, the amount of gas necessary for ignition of the burner can be secured, the ignitability is excellent, and the ignition is easy even if there is an air pocket in the gas supply passage.

When the gas supply to the burner is large, the solenoid valve disposed in the gas supply path has a short forced opening holding time. Therefore, the amount of gas enough to explode and ignite is not accumulated, and safe ignition is possible.

(Effect) Since the forced valve opening holding time is determined according to the gas supply amount to the burner, the burner can ignite safely and reliably even when the gas supply amount to the burner is small or large.

[Embodiment] Next, a first embodiment of the present invention will be described with reference to FIGS. 1 to 5.

As shown in FIG. 1, the instantaneous water heater A has a water circuit 1, a gas circuit 2, a combustion control device 3, and a water solenoid valve control device 4.

The water circuit 1 includes a water solenoid valve 11 and a water governor that keeps the outflow rate constant.
12. A water amount adjusting valve 13 in which the amount of water is changed by the rotation of the temperature control knob 131, a heat exchanger 14, a hot water outlet pipe 15, and a shower head 16.

The gas circuit 2 is a water pressure responsive valve that is integrally formed with the original solenoid valve 21 and the water governor 12 and that opens when the water flow is detected.
22, a gas governor 23 for keeping the gas pressure on the secondary side constant, and a temperature control knob 131 (see FIG. 2), and a gas amount control valve for increasing or decreasing the gas supply amount based on the angle of the knob 131. twenty four
And a gas burner 25.

The combustion control device 3 (battery drive) operates the sparker 31 based on the operation of the water pressure responsive valve 22, and simultaneously with the operation, the original solenoid valve 21 is operated for a predetermined time of 0.8 seconds to 1.6 seconds (3rd (Shown in the figure), the original solenoid valve 21 is forcibly held open. Reference numeral 32 is a variable resistor, which is connected to the knob 131 by gears 132 and 133 and is a part of the timer circuit 30 (shown in FIG. 4) of the combustion control device 3.

The water solenoid valve control device 4 includes a phototransistor 41 that detects infrared rays 50 reflected by the hand 5 and the like and a light emitting diode 43 that emits infrared rays. When the hand 5 is detected, the water solenoid valve 11 is opened, and when the hand 5 is detected again, the water solenoid valve 11 is opened. The solenoid valve 11 is closed.

Next, the operation main part of the instantaneous water heater A will be described based on the flowchart shown in FIG.

(1) Turn on the power switch (step; hereinafter omitted for S
1) When the water solenoid valve control device 4 detects the hand 5 (S2), the water solenoid valve 11 is energized to open the valve 11 (S3).

(2) An amount of water corresponding to the angle of the temperature control knob 131 flows, and the water pressure responsive valve 22 is opened by the water pressure.

(3) Opening detection of the hydraulic pressure responsive valve 22 is performed (S4: yes)
And the sparker 31 are operated (S5), and the original solenoid valve 21 is forcibly held open for a predetermined time (S6).

Here, when the knob 131 is at the right end, the gas supply amount is maximum (9650 kcal / h), the water amount is minimum, and the predetermined time is set to 0.8 seconds. Further, when the knob 131 is at the left end, the gas supply amount is the minimum (5000 kcal / h), the water amount is the maximum, and the predetermined time is set to 1.6 seconds.

(4) Flame rod 33 detects ignition flame 251 (yes in S7)
Then, the combustion control device 3 stops the operation of the sparker 31 (S
8) Do. When the ignition flame 251 cannot be detected within a predetermined time after the operation of the sparker 31 (no in S7), the combustion control device 3 closes the original solenoid valve 21 (S10).

(5) During combustion, when the thermocouple 34 detects a combustion abnormality such as the gas burner 25 disappearing (yes in S9), the combustion control device 3 closes the original solenoid valve 21 (S10). If no combustion abnormality is detected (No in S9), the combustion is maintained.

The operational effects of the instant water heater A in this embodiment are as follows.

(A) As shown in FIG. 3, as the gas supply amount increases,
The predetermined time is set to be continuously shortened. Therefore, there is no possibility of explosive ignition in the region where the gas supply amount is large, and ignition failure can be prevented in the region where the gas supply amount is small.
Therefore, the gas burner 25 can be ignited safely and reliably regardless of whether the gas supply amount is small or large.

(A) Since the water solenoid valve 11 is opened by the detection of the hand 5 and the water solenoid valve 11 is closed by the detection again, the operability is excellent.

Next, a second embodiment of the present invention will be described with reference to FIGS. 6 and 7.

The timer circuit 30 of this embodiment has the configuration shown in FIG. 6, and uses a switch 35 that operates in association with the rotation of the temperature control knob 131.

When the temperature adjustment knob 131 exceeds the point P and the gas supply amount increases, the switch 35 is closed and the predetermined time is from 1.6 seconds to 0.8 seconds.
Switch to seconds.

Therefore, even though the structure is simple, the possibility of explosive ignition in the region where the gas supply amount is large is significantly reduced, and the ignition does not fail in the region where the gas supply amount is small.

(Modification) a. In the above embodiment, the amount of water and the amount of gas supplied are changed by rotating the temperature adjustment knob 131, but only the amount of gas supplied may be used.

b. In the combustion device of the type in which the solenoid valve opens after the spark starts, the start of the ignition operation to the burner means the opening of the solenoid valve.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a structural explanatory view of an instant water heater which is a first embodiment of the present invention, FIG. 2 is an assembly view of a variable resistor used in the water heater, and FIG. Is a graph showing the relationship between the gas supply amount and the predetermined time in the water heater, FIG. 4 is an electric circuit diagram of a timer circuit that determines the predetermined time, and FIG. 5 is for explaining the operation of the water heater. It is a flowchart of. FIG. 6 is an electric circuit diagram of a timer circuit for determining a predetermined time of the instant water heater which is the second embodiment of the present invention, and FIG. 7 is a graph showing the relationship between the gas supply amount and the predetermined time in the water heater. Is. In the figure, 2 ... Gas circuit (gas supply path), 21 ... Original solenoid valve (solenoid valve), 25 ... Gas burner (burner)

Claims (1)

[Claims] 1. A solenoid valve which is opened by energization is arranged in a gas supply passage for supplying gas to a burner, and the solenoid valve is forcibly kept open for a predetermined time from the start of ignition operation to the burner. In the combustion apparatus, the predetermined time is set to be shorter as the gas supply amount increases.