JPS6157970B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a combustion device control circuit for a hot water boiler that requires preheating of the combustor.

A conventional combustion device control circuit is shown in FIG. This circuit includes a hot water temperature regulating thermostat 19 connected to power supply wiring 100, 101 that supplies power via a power plug 1, and a relay 20 and a flame detection circuit 9 connected in series to the hot water temperature regulating thermostat 19. Safety circuits such as the output switch 16, the output switch 15 of the water detection circuit 6, and the earthquake-resistant automatic fire extinguishing system 14 are connected. Output switch 1 of flame detection circuit 9
Reference numeral 6 denotes an output contact of a daycade counter IC circuit, which can be set to open, for example, at the fourth combustion operation. This circuit further includes a thermostat 21 for adjusting the temperature of the combustor vaporization surface, which has two first and second switching contacts 61 and 62 for the reference contact 60, which are switched in accordance with the vaporization surface temperature,
The vaporization surface heating heater 22 is connected to the first switching contact 61 side, and the combustor drive circuit section 51 is connected to the second switching contact 62 side. Combustor drive circuit section 5
1 is a combustion blower 24, a cooling blower 25, a relay 26, a wind pressure switch 27, an ignition transformer 29,
It is composed of a fuel pump 38 and the like. Note that FD shown in the figure is an output contact from the flame detection circuit 9, and is a contact that turns ON to detect ignition. Also, XT-
1 is a contact that operates with a pseudo circuit timer since there is no flame when it is not ignited.It is a timer, and when a misfire occurs, it turns OFF together with the FD. When performing a known sequence operation in the conventional combustion device control circuit as described above, the hot water temperature regulating thermostat 19 is turned on and the safety circuit is normal.
The heater 22 for heating the vaporization surface is energized for the first time, and when the set temperature is reached, the thermostat 21 for adjusting the temperature of the combustor vaporization surface is reversed, the reference contact piece 60 connects with the second switching contact 62, and becomes the back contact of the wind pressure switch 27. The electricity is turned on, the relay 26 operates, and the combustion blower 2
4 operates, detects the wind pressure, and switches the wind pressure switch 2.
7 is reversed, ignition transformer 29, fuel pump 38
operates and starts burning. However, in such a conventional circuit, when the hot water temperature adjustment thermostat 19 is turned off, the heating heater 22 is turned off.
The combustor vaporizing surface temperature adjustment thermostat 2
1 takes time to reach the set temperature and reverse, that is, to move to combustion operation, and water may come out when hot water is supplied from the water heater. That is, if a large amount of hot water is supplied when the thermostat 19 is off or during the preheating time of the combustor vaporization surface, reheating will not be completed in time and water will come out. One way to deal with such problems is to install a fairly large hot water tank, but this is not a good idea given the current housing situation. Another method is to shorten the combustor heating time by using a gun-type burner, which is used in oil instantaneous boilers, but such gun-type burners have poor combustibility and are prone to lower combustion efficiency due to incomplete combustion. Therefore, it is not economical and causes harmful effects such as generation of soot and noise.

The present invention has been made in view of the above points, and is capable of controlling the energization to the heater for heating the evaporation surface independently of the thermostat for regulating the hot water temperature, so that it can be turned on at the same time as the thermostat for regulating the hot water temperature. By energizing the combustor drive circuit to start combustion, hot water can be obtained at a sufficiently high temperature even when a large amount of hot water is used at once, and an electric timer allows heating of the evaporation surface at any time. It is an object of the present invention to provide a combustion device control circuit for a hot water boiler, which enables electricity to be applied to a heater so that a sufficient amount of hot water can be obtained immediately when desired. Therefore, in the present invention,
In a combustion device control circuit for a hot water boiler that requires preheating of the combustor vaporization surface, two first and second
A thermostat for adjusting the temperature of the combustor vaporization surface has a switching contact, the first switching contact is connected to the heater for heating the vaporization surface, and the second switching contact is connected to the combustor drive circuit. An interlocking switch consisting of a contact that is turned on and a contact that is turned off is connected to one side of the reference junction and the second switching contact side of the thermostat for adjusting the temperature of the vaporization surface of the combustor so as to interlock with each other, so that the thermostat for temperature adjustment A contact point of a relay that turns ON when the thermostat turns ON and turns OFF when the thermostat turns OFF is connected in parallel to a contact point of the interlocking switch that becomes non-conducting when the switch turns ON, and an electrically operated relay for setting the operating time of the interlocking switch. Equipped with a timer.

FIG. 2 shows an embodiment of the combustion device control circuit according to the present invention. 1 is the power plug, 2 is the fuse, 3
5 is a varistor for a surge absorber, 5 is a neon lamp, and 4 is a fixed resistor for limiting the current of the neon lamp 5. 6 is a water detection circuit, 7
1 is a corrosion protection electrode, 8 is a flame detection electrode, 9 is a flame detection circuit, 10 is an ignition switch, 11 is a delay thermostat, 1
2 is auto cut and thermo fuses. 13 is a contact point of the relay 20, 14 is an earthquake-resistant automatic fire extinguishing system, 15 is an output switch of the water detection circuit 6, 1
6 is an output switch of the flame detection circuit 9, 17 is a resistor, 18 is a neon lamp for confirmation, 19 is a thermostat for regulating the water temperature, and 20 is a relay. 21 is a thermostat for regulating the temperature of the combustor vaporizing surface, and has a reference contact piece 60, a first switching contact 61, and a second switching contact 62. Reference numeral 22 denotes a heater for heating the vaporization surface, and is connected to the first switching contact 61. 23 is a contact point of a relay 26, 24 is a combustion blower, 25 is a cooling blower, and 26 is a relay which memorizes that the combustor vaporizing surface temperature has exceeded a set value. 2
7 is a wind pressure switch, 28 is an output relay contact of a timer circuit 35, and 29 is an ignition transformer, which operates only when ignited by the timer circuit 35. 32 is a neon lamp for combustion confirmation, 33 is a resistor, 34 is a rectifier,
36 is a frequency pulse width setting circuit for driving the pump, 3
7 is a variable resistor for current adjustment, and 38 is an electromagnetic pump for fuel supply, and these constitute a combustor drive circuit section 51. This circuit further includes a contact 39 that becomes conductive when the switch is turned on, a contact 40 that becomes non-conductive, and a contact 41 that turns on when the thermostat 19 for regulating the hot water temperature is turned on, operating the relay 20.
It is equipped as shown in the figure. That is, each contact point 3 mentioned above
An interlocking switch consisting of 9 and 40 is provided on the reference contact 60 side and the second switching contact 62 side of the thermostat 21 for controlling the temperature of the combustor vaporization surface so as to be interlocked with each other, and the contact of the relay 20 is connected in parallel to this contact 40. 4
1 is connected.

According to the control circuit having such a configuration, the ignition switch 10 is turned on and combustion is started by a known sequence operation, and when the hot water temperature reaches a set value, the hot water temperature regulating thermostat 19 is turned off and combustion is stopped. In this state, if the interlocking switch is turned on, the supply of electricity to the heater 22 is controlled by the thermostat 21 to maintain the vaporizing surface temperature. Then, at the same time that the hot water temperature regulating thermostat 19 is turned on, the relay contact 41 is turned on, and the combustor drive circuit section 51 is energized to start combustion.

For this reason, especially when using a large amount of hot water at one time, the contacts 39 and 40 of the interlocking switch are turned on in advance to control the supply of electricity to the heater 22 independently of the thermostat 19 for adjusting the hot water temperature. By doing so, combustion can be started at the same time as the hot water temperature regulating thermostat 19 is turned on, so that the chance of water coming out depends only on the amount of combustion, which facilitates design and ease of use.
In the circuit of the present invention, the power supply wiring 100, 1
An electric timer 42 is provided between 01 and 01, and the timer 42 is configured to arbitrarily set the operating time of the above-mentioned interlocking switch. This timer 42 can be set to turn on at any arbitrary time or turn off at another arbitrary time, and the contacts 39 and 40 of the interlocking switch can be turned on and off at any of the above arbitrary times. As a result, if the electric timer 42 is set so that the interlocking switch operates at a predetermined time in accordance with the usage time of the bath, which has a particularly large heat load, only the heating heater 22 can be energized semi-automatically in advance. It is possible to continuously supply a sufficient amount of hot water even when supplying hot water to a bath or the like that requires a large amount of hot water.

As described above, in an oil-fired hot water boiler that requires preheating of the vaporizing surface, the heating start time of the vaporizing surface can be memorized by turning on and off the heater for heating the vaporizing surface of the combustor by arbitrary setting of the electric timer. The heater is automatically controlled according to the daily pattern, the electric timer automatically controls the temperature of the evaporation surface when the interlocking switch contact is turned on, and combustion starts immediately when the hot water temperature regulator is turned on. ,
When the contact of the interlocking switch is turned off by the electric timer, the thermostat for regulating the hot water temperature is turned on and preheating of the evaporation surface can be started. That is, if the combustion device control circuit according to the present invention is used,
By turning on the thermostat for regulating the hot water temperature, the temperature of the thermostat for regulating the evaporation surface temperature of the combustor is turned on without waiting for the contact to the combustion drive circuit side to reverse due to the temperature rise.
Combustion starts immediately and a sufficient amount of hot water can be continuously supplied even when a large amount of hot water is used at once. Furthermore, the electric timer allows the vaporization surface heating start time to be set arbitrarily, making it extremely convenient.

[Brief explanation of the drawing]

FIG. 1 is a conventional combustion device control circuit diagram, and FIG. 2 is a combustion device control circuit diagram according to the present invention. 19...Thermostat for regulating hot water temperature, 20...
Relay, 21... Thermostat for controlling the temperature of the combustor vaporization surface, 22... Heater, 39, 40...
Contact, 41... Relay contact, 42... Electric timer, 51... Combustor drive circuit section, 60... Reference contact piece, 61... First switching contact, 62... Second switching contact.

Claims (1)

[Claims] 1. In a combustion device control circuit for a hot water boiler that requires preheating of a combustor vaporization surface, the circuit has two first and second switching contacts for a reference contact piece that switches according to the temperature of the vaporization surface, and the first switching contact is A thermostat for adjusting the temperature of the combustor vaporization surface is connected to the heater for heating the vaporization surface, and a second switching contact is connected to the combustor drive circuit section, while the thermostat has a contact that becomes conductive when the switch is turned on and a contact that becomes non-conductive. An interlocking switch is connected to the reference contact side and the second switching contact side of the combustor vaporization surface temperature adjustment thermostat so that they are interlocked with each other, and the hot water temperature adjustment thermostat is turned on.
A contact point of a relay that turns ON when the thermostat turns OFF and turns OFF when the thermostat turns OFF is connected in parallel to a contact point of the interlocking switch that becomes non-conducting when the switch turns ON, and an electric timer is used to set the operating time of the interlocking switch. and the interlocking switch is
A combustion device control circuit characterized in that when turned on, the heating heater is configured to be energized regardless of the operation of the hot water temperature regulating thermostat, and the energization start time can be arbitrarily set by the electric timer. .