JPS6330032Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention uses a vaporization burner, more specifically, a vaporization chamber provided in the combustion section, which is heated by the combustion heat of the ignition burner at the time of startup to vaporize the liquid fuel supplied to the vaporization chamber. The present invention relates to a water heater equipped with a vaporizing burner that sends a mixture of fuel and air to a combustion section to vaporize and burn it, and at the same time self-heats the vaporizing chamber.

Conventionally, when trying to heat water with this type of burner and discharge it to a set temperature, when the temperature of the hot water drops at the start of tapping, the ignition burner is first combusted and then switching to post-vaporization combustion, and the temperature is set by vaporization combustion. When the temperature rises, the vaporization combustion is stopped, and because the combustion capacity of the vaporization combustion is large, overshoot is significant and the hot water tapping characteristics are extremely poor.

The present invention solves the above-mentioned conventional drawbacks with a simple structure, and will be described below along with an embodiment shown in the drawings.

1 is the main body of the water heater, and there is a can body 2 on the top of the main body 1.
The lower part is equipped with a vaporizing burner 3, and the can body 2
has a water chamber 7 surrounded by an outer cylinder 4, an upper end plate 5, and a lower end plate 6, and a number of smoke pipes 8 are passed through the water chamber 7. An exhaust chamber 9 is formed above the upper end plate 5, and a combustion chamber 10 is formed below the lower end plate 6. 11 is a hot water outlet pipe, 12 is a water supply pipe, 1
3 is a temperature detector such as a thermistor installed in the water chamber 7. On the other hand, the vaporizing burner 3 is provided with a bottomed combustion tube 15 having a flame port 14 on the peripheral wall, and a combustion section 16 for vaporization combustion is formed inside the combustion tube 15.
Further, an opening 17 is provided at the bottom of the combustion tube 15, and the opening 17 is closed by a bent-arm-shaped vaporization tube 19 which is provided upright on the combustion tube 15 and has a vaporization chamber 18 inside. Reference numeral 20 denotes an outer cylinder surrounding the peripheral wall and bottom wall of the combustion cylinder 15 with a passage gap for the mixed gas. 21
is a blower tube that penetrates the outer cylinder 20, is inserted into the opening 17, and has its tip open to the vaporization chamber 18, and the blower tube 21
A spray nozzle 22' is mounted inside facing the vaporization chamber 18, and a fuel supply device such as a solenoid valve for supplying liquid fuel to the spray nozzle 22' is provided. 23 is a blower that blows air to the blower tube 21 via the wind box 24. 25 connects the crater 26 to the vaporizer tube 19 in the combustion section 16
The ignition burner opens towards the ignition burner 2.
5 is equipped with a small-capacity spray nozzle 27 and an igniter 28, and air is blown from the air box 24 through an air pipe 29. Incidentally, when the ignition burner 25 is started, combustion is performed by opening the solenoid valve 31 and by energizing the igniter 28, and the vaporization chamber 18 rises to the set temperature and the solenoid valve opens, that is, the fuel supply device 3
After 2 is activated and vaporization combustion is performed, the operation is stopped as described later.

FIG. 2 shows an embodiment of the electric circuit according to the present invention, which has a temperature sensor 13 on one side.
Two bridge circuits, namely temperature detector 13 and resistor 3
Bridge circuit 36 formed by 3, 34, and 35
and a bridge circuit 39 formed by the temperature detector 13 and resistors 33, 37, and 38.
Thermocircuits 40 and 41 on the high-temperature side and low-temperature side are provided, which operate when the connection potential with 3 reaches the set potential, and the thermocircuit 40 on the high-temperature side operates at a higher set temperature than the thermocircuit 41 on the low-temperature side. . Reference numeral 42 denotes a relay that controls the electromagnetic valve 31 that operates the ignition burner 25 and the energization of the igniter 28, and is controlled by a transistor 43 that is turned on by an ON signal generated by the operation of the high temperature side thermocircuit 40. Reference numeral 44 denotes a relay for operating the fuel supply device 32 such as a solenoid valve. The relay 44 is controlled by turning on and off a transistor 45, and the transistor 45 is controlled by the output of an AND circuit 46. 47
is a temperature switch that closes when the vaporization chamber 18 reaches a set temperature. In addition, the blower 23 and the pump 30 are configured such that one of the thermocircuits 40 and 41 on the high temperature side and the low temperature side is energized when activated, and the ignition burner 2
The combustion capacity of No. 5 is set to about half that of vaporization combustion.

The present invention has such a configuration, and when the burner 3 is operated, the water temperature in the water chamber 7 is low at the time of startup, so the thermo circuits 40 and 41 on the high temperature side and the low temperature side are activated, and the blower 23 and the pump are activated. 30 is activated, the transistor 43 is turned on, the relay 42 is activated, and the electromagnetic valve 31 is opened, the igniter 28 is activated, the ignition burner 25 is ignited, and the vaporization chamber 18 is heated. Also, at the time of starting, the low temperature side thermo circuit 41 is the high temperature side thermo circuit 4.
0, but since the temperature switch 47 for detecting the vaporizing chamber temperature is open, there is no output from the AND circuit 46, and the relay 44 does not operate. When the vaporization chamber 18 reaches the set temperature due to combustion in the ignition burner 25, the temperature switch 47 is closed, the output of the AND circuit 46 becomes high, the transistor 45 becomes conductive, the relay 44 is activated, and the fuel supply device 32 is activated. The fuel is sent from the spray nozzle 22 to the vaporization chamber 18. In the vaporization chamber 18, the fuel is vaporized by receiving the combustion heat of the ignition burner 25, and the vaporized fuel is mixed with air and flows into the flame nozzle 1.
4 into the combustion section 16, the jetted air-fuel mixture ignites the flame of the ignition burner 25 and burns, heating the hot water in the water chamber 7. Once this vaporization combustion flame is formed, a switch 48 for vaporization combustion flame detection connected in series with the relay 42 is opened, for example, by the operation of a flame detection device (not shown) or by the operation of a burner temperature detection device, and the relay 42 is activated. The operation is stopped, and the combustion of the ignition burner 25 is stopped.

Due to this vaporization combustion, the water temperature in the water chamber 7 gradually rises, and when it reaches the low set temperature, the low temperature side thermo circuit 41 stops operating, the output of the AND circuit 46 decreases, and the relay 44 stops operating. Then, the fuel supply device 32 is shut off and the vaporization combustion is stopped. At the same time as the vaporization combustion is stopped, the switch 48 is closed and the ignition burner 25 restarts combustion. This ignition burner 2
When the water temperature further rises due to the combustion of 5 and reaches a high set temperature higher than the above set temperature, the high temperature side thermo circuit 4
0 also stops operating, the relay 42 stops, the solenoid valve 31 closes, the ignition burner 25 extinguishes, and the blower 23 and pump 30 stop driving.

If hot water is dispensed at this time, the high temperature side thermo circuit 40 will be activated first due to a constant temperature drop, and the relay 4 will be activated.
2 operates, the ignition burner 25 burns, and when the temperature further decreases, the low temperature side thermocircuit 41 operates and the relay 44 operates to perform vaporization combustion. That is, when dispensing a small amount of hot water, the ignition burner 25 blinks, and when dispensing a large amount of hot water, the hot water temperature is controlled to the set temperature by switching the ignition burner 25 between combustion and vaporization combustion.

As described above, the present invention includes an ignition burner that heats the vaporization chamber provided in the combustion section, a fuel supply device that supplies liquid fuel to the vaporization chamber, and a mixture of vaporized fuel and air in the vaporization chamber. It consists of a vaporizing burner having a combustion part that is heated by the vaporizing burner, a can heated by the vaporizing burner, and a temperature detector attached to the water chamber of the can. A thermo circuit with two temperature settings, high and low, is provided, and the ignition burner operates only when the high temperature side thermo circuit is activated and the vaporization combustion flame detection switch detects the end, and the fuel supply device operates only when the low temperature side thermo circuit is activated. Since it is made to operate only when the temperature switch for detecting the temperature of the vaporizing chamber is activated and the temperature switch for detecting the temperature of the vaporizing chamber is detected, whereas conventional burners of this type stop vaporizing combustion at the set temperature, the present invention When the set temperature is reached, vaporization combustion switches to combustion in the ignition burner, and combustion in the ignition burner stops at the second stage set temperature, so there are fewer overshoots than in the past, and therefore In comparison, the hot water discharge characteristics are significantly better. In addition, according to the present invention, the residual gas mixture when the vaporization combustion is stopped can be combusted by the combustion of the ignition burner 25, so that the residual gas mixture can be re-liquefied as in the conventional case, or stimulated in the final combustion state. It has beneficial effects such as not being discharged with odor.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention;
FIG. 2 shows one embodiment of the electric circuit. 2... Can body, 3... Vaporizing burner, 16... Combustion section, 18... Vaporizing chamber, 25... Ignition burner, 32
... Fuel supply device, 40 ... High temperature side thermo circuit,
41...Low temperature side thermo circuit.

Claims (1)

[Scope of utility model registration request] A vaporizing burner having an ignition burner that heats a vaporizing chamber provided in a combustion section, a fuel supply device that supplies liquid fuel to the vaporizing chamber, and a combustion section that supplies a mixture of vaporized fuel and air in the vaporizing chamber. , a thermo circuit consisting of a can body heated by the vaporizing burner and a temperature detector attached to the water chamber of the can body, which sets the operating temperature in two stages, high and low, to be compared with the water temperature detected by this temperature detector. The ignition burner operates only when the high-temperature side thermocircuit is activated and the vaporization combustion flame detection switch is not detected, and the fuel supply device operates only when the low-temperature side thermocircuit is activated and the vaporization chamber temperature detection switch is activated. A water heater equipped with a vaporizing burner, characterized in that it is activated only when a temperature switch is detected.