JPH04186016A - Burner - Google Patents

Abstract

PURPOSE:To make it possible to ignite definitely by setting a forcible opening of a solenoid valve so as to supply gas where a preset gas supply time be reduced as the amount of gas supply is increased from the ignition starting time to a burner in a burner type combustion device. CONSTITUTION:When a phototransistor 41 and a light emission diode 43 detect a hand 5, a water solenoid valve control device 4 supplies electric power to a water solenoid vale 11 thus opening the value 11. Then, the amount of water in conformity with the angle of temperature conditioning control flows and the hydraulic pressure of the water flow forces a hydraulic pressure response valve to be opened. A sparker 31, when the valve opening is detected, operates and forcibly opens a block solenoid valve 21, keeping its opening status. When a temperature conditioning control rests on one high temperature side end, it is set that the supply amount of gas be maximized and the amount of water be minimized while a specified time to keep open a solenoid valve 21 be reduced by 0.8sec for example. When the control rests on the low temperature side end, it is set that the amount of water be maximized and the amount of gas be minimized while valve opening time be increased by 1.6sec for example.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a combustion device for supplying gas to a burner for combustion.

[Prior art] A solenoid valve is opened for a certain period of time from the start of ignition operation,
BACKGROUND OF THE INVENTION Combustion devices are conventionally known in which if ignition of a burner is detected, a solenoid valve is kept open, and if ignition cannot be detected, the solenoid valve is closed.

Furthermore, in the case of a gas instantaneous water heater, etc., where the burner combustion amount can be freely set by the user from a large combustion amount (large gas supply amount) to a small combustion amount (gas supply rate), the above-mentioned fixed time is The length is set short based on a large combustion amount so that raw gas does not explode and ignite even if it accumulates.

[Problems to be Solved by the Invention] However, in conventional combustion devices, when trying to ignite with a small combustion amount with a small amount of gas supplied, the fixed time is too short and it is difficult to ignite. There is a disadvantage that it is difficult to ignite in some cases.

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

[Means for Solving the Problems] In order to achieve the above object, the present invention disposes a solenoid valve that opens when energized in the gas supply path that supplies gas to the burner, and operates for a predetermined period of time from the start of the ignition operation to the burner. In the combustion device that forcibly holds the electromagnetic valve open during this period, a configuration is adopted in which the predetermined time is set to become shorter as the amount of gas supplied increases.

[Operations and Effects of the Invention (Operations) When the amount of gas supplied to the burner is small, the time period during which the solenoid valve disposed in the gas supply path is kept forcibly open is long.

Therefore, the amount of gas required to ignite the burner can be secured, the ignitability is excellent, and ignition is easy even if there is an air pocket in the gas supply path.

When a large amount of gas is supplied to the burner, the time period during which the solenoid valve disposed in the gas supply path is kept open forcibly is short. Therefore, the amount of gas that causes explosion and ignition does not accumulate, and ignition can be done safely.

(Effects) Since the forced open holding time is determined according to the amount of gas supplied to the burner, the burner ignites safely and reliably whether the amount of gas supplied to the burner is small or large.

[Example] Next, a first example of the present invention will be described based on FIGS. 1 to 5.

As shown in FIG. 1, the instantaneous water heater A has a water inlet passage 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, a water governor 12 that keeps the outflow amount constant, a water amount adjustment valve 13 that changes the amount of water by rotating a temperature control knob 131, a heat exchanger 14, a hot water outlet pipe 15, and a shower head 16. It is made up of.

The gas circuit 2 includes a main solenoid valve 21, a water pressure responsive valve 22 that is formed integrally with the water governor 12 and opens in conjunction with the detection of water flow, and a gas governor 2 that keeps the gas pressure on the secondary side constant.
3 and connected to the temperature control knob 131 (see FIG. 2),
It is composed of a gas amount adjusting valve 24 whose gas supply amount is increased or decreased based on the angle of the knob 131, and a gas burner 25.

The combustion control device 3 (battery driven) operates the sparker 31 based on the operation of the hydraulically responsive valve 22, and at the same time, the original solenoid valve 21 is activated for a predetermined period of 0.8 seconds to 1.6 seconds. Q (as shown in FIG. 3), the original solenoid valve 21 is forcibly held open. A variable resistor 32 is connected to the knob 131 by gears 132 and 133, and is part of the timer circuit 30 (shown in FIG. 4) of the combustion control device 3.

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

Next, the main operating parts of the instantaneous water heater A will be explained based on the flowchart shown in FIG.

(1) Step to turn on the power switch; hereinafter abbreviated as S1
), when the water solenoid valve control device 4 detects the hand 5 (S2), it energizes the water solenoid valve 11 and opens the valve 11 (S3).

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

(3) The opening of the water pressure responsive valve 22 is detected (y in S4).
es) and the sparker 31 (S5), and the original solenoid valve 21 is forcibly kept open for a predetermined period of time (S6).

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

(4) Flame rod 33 detects ignition flame 251 (S7
If the ignition flame 251 cannot be detected within a predetermined time after the sparker 31 is activated (S7), the combustion control device 3 stops the operation of the sparker 31 (S8).
(no), the combustion control device 3 closes the original solenoid valve 21 (SI
O) Do.

(5) During combustion, when the thermocouple 34 detects a combustion abnormality such as the gas burner 25 going out (YES in S9), the combustion control device I3 closes the main solenoid valve 21 (SIO);
If no combustion abnormality is detected (no in S9), combustion is maintained.

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

(a) As shown in Figure 3, the larger the gas supply amount, the more
The predetermined time is set to become shorter continuously. Therefore, there is no possibility of explosion and ignition in areas where the amount of gas supplied is large, and ignition failure can be prevented in areas where the amount of gas supplied is small.

Therefore, whether the amount of gas supplied is small or large, the gas burner 25 can be safely and reliably ignited.

(a) The water solenoid valve 11 is opened when the hand 5 is detected, and the water solenoid valve 11 is closed when the hand 5 is detected again, so operability is excellent.

Next, a second embodiment of the present invention will be described based on FIGS. 6 and 7.

The timer circuit 30 of this embodiment has the configuration shown in FIG.
A switch 35 that operates in conjunction with the rotation of the temperature control knob 131
is used.

When the temperature control knob 131 exceeds point P and the gas supply amount increases, the switch 35 closes and the predetermined time changes from 1.6 seconds to 0.8 seconds.

Therefore, although the configuration is simple, the possibility of explosion and ignition is significantly reduced in a region where a large amount of gas is supplied, and ignition does not fail in a region where a small amount of gas is supplied.

(Modified Example) a. In the above embodiment, the amount of water and the amount of gas supplied can be varied by rotating the temperature control knob 131, but it is also possible to change only the amount of gas supplied.

b. In a type of combustion device in which the solenoid valve opens after sparking starts, the time when the burner ignition operation starts means the time when the solenoid valve opens.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of the structure of an instantaneous water heater according to the first embodiment of the present invention, Fig. 2 is a diagram showing the assembly of a variable resistor used in the water heater, and Fig. 3 is an illustration of the assembly of the variable resistor used in the water heater. FIG. 4 is a graph showing the relationship between gas supply amount and predetermined time, FIG. 4 is an electric circuit diagram of a timer circuit that determines the predetermined time, and FIG. 5 is a flowchart for explaining the operation of the water heater. Fig. 6 is an electric circuit diagram of a timer circuit for determining a predetermined time in an instantaneous water heater according to a second embodiment of the present invention, and Fig. 7 is a graph showing the relationship between gas supply amount and predetermined time in the water heater. It is.

Claims (1)

[Claims] 1) A solenoid valve that opens when energized is disposed in a gas supply path that supplies gas to the burner, and the solenoid valve is forcibly closed for a predetermined period of time from the start of ignition operation to the burner. A combustion device that maintains a valve open, characterized in that the predetermined time is set to become shorter as the amount of gas supplied increases.