JPS6021638Y2 - Vaporized liquid fuel combustion device - Google Patents

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to a vaporized liquid fuel combustion device, and in particular, to shorten the preheating time of the vaporizer and reduce the power consumption of the closed heating element that performs the preheating. The present invention relates to a vaporized liquid fuel combustion device suitable for.

[Technical background of the invention and its problems]

Conventionally, a sheathed heater for preheating a vaporizer used in a vaporizer kerosene stove or the like is energized intermittently to perform preheating from when the operation switch is turned on until combustion, and to compensate for the lack of heat recovery after combustion.

On the other hand, a vaporizer that is preheated by a sheathed heater has a large heat capacity and therefore takes a long time to wait from when the operation switch is turned on until combustion.

For this reason, conventionally, the power consumption of the sheathed heater has been increased in order to shorten this waiting time.

However, since the sheathed heater is intermittently energized even during combustion as described above, it consumes a large amount of power even during combustion that does not require a large amount of heat.

Furthermore, the power capacity of a typical household is not large, and there is a risk of exceeding the capacity if used together with other electrical appliances.

[Purpose of invention]

The present invention was devised to solve these conventional problems, and its purpose is to shorten the preheating time of the vaporizer and to reduce the power consumption of the sealed heating element for preheating the vaporizer. To provide a less vaporized liquid fuel combustion device.

[Summary of the idea]

In this invention, the NC side of the contact activated by a relay built into the combustion circuit is directly connected to the closed heating element that preheats the carburetor, and the NO side is connected via a reactor during preheating. A large current is passed through the body to quickly preheat it, and a small current is passed during combustion to reduce power consumption.

[Example of idea]

The present invention will be explained below based on an embodiment shown in FIGS. 1 to 3.

In FIG. 1, 1 is a vaporizer that injects vaporized gas to a burner 2 through a nozzle 3, and this vaporizer 1 is sent to a volume 1 in an oil pan 6 via a vaporization pipe 4 and an oil feed pipe 5. It is connected to pump 7.

The volute pump 7 is driven by a pump motor 8 to supply kerosene in the oil pan 6 to the carburetor 1 side.

A sheathed heater 9 is located near the vaporizer 1, and a burner 2 is located near the vaporizer 1.
As shown in FIG. 2, spark plugs 10 are provided nearby.

When the power switch is turned on in the above configuration, the sheathed heater 9 is energized and the vaporization pipe 4 and the vaporizer 1 are preheated.

When the temperatures of the vaporization pipe 4 and the vaporizer 1 reach a temperature sufficient to vaporize and burn kerosene, the sheathed heater 9 is de-energized and the pump motor 8 is energized.

When the pump motor 8 rotates, the volute pump 7 forces the oil in the oil pan 6 to the carburetor 1 side, vaporizes it in the vaporization pipe 4, and injects it from the nozzle 3.

This vaporized gas and primary air are mixed in the burner 2, injected from the burner 2, mixed with secondary air, and further ignited by the spark plug 10 to be burned.

FIG. 3 shows the electric circuit of the device of this embodiment, which will be explained below.

In the figure, SW is the operation switch, ■ is the carburetor thermometer that turns off when the temperature of the carburetor 1 rises, and S2 is the relay RL.
2 is a contact that switches from the NC side to the No side by excitation, 9 is a sheathed heater connected to the No side of contact S2, and this sheathed heater 9 is directly connected to the NC side of contact S3, and the No side is connected to reactor R. are connected to each other via.

This contact S3 is switched by excitation of relay RL3.

T is an ignition transformer connected to the spark plug 10, 8 is a pump motor, FM is a fan motor for convection, S4 is a contact that is turned on when the relay RL of the flame detection circuit 11 is energized, 12 is a safety circuit, and S5 is a Relay RL5 of safety circuit 12
The contact S□ is turned off by the excitation of relay RL1, and the contact S is provided for safety in the event of combustion during a power outage while the operation switch SW is on. It is something.

Next, the operation of this embodiment will be explained.

When the operation switch SW is off, the relay RL1 is excited and the contact S1 is on.

When the operation switch SW is turned on, the contact S2 is switched to the No side by the excitation of the relay RL2, the sheathed heater 9 is energized, and the vaporizer 1 is preheated.

At this time, since the contact S3 is on the NC side, a large current flows through the sheathed heater 9, and the temperature of the vaporizer 1 rises rapidly.

When the temperature of the vaporizer 1 rises to a predetermined temperature, the vaporizer thermo Th is turned off and the relays RI and 2 are demagnetized.

This switches contact S2 to the NC side and relay RL1
is excited, energizes the ignition transformer T1 pump motor 8 and fan motor FM to start combustion, and
Contact S3 switches to the No side.

At the same time, the flame detection circuit 11 is energized, and the relay RL4
The contact S is turned on by the excitation of .

As a result, the carburetor thermo h turns on during combustion, and the contact S
Even if 2 is switched to the No side, the current passing through the sheathed heater 9 also passes through the accelerator R, so only a smaller current flows through the sheathed heater 9 than during preheating, reducing power consumption.

Due to some kind of accident, safety circuit 12 is activated and relay R'L
When S is excited, contact S5 turns off and relay R
L1 is demagnetized and the contact is also turned off.

As a result, combustion will not start unless the operation switch SW is turned off and restarted, thereby ensuring safety.

As explained above, this embodiment provides the following effects.

(1) In the ignition waiting state, a large current flows through the sheathed heater, so the ignition waiting time can be shortened, and during combustion, only a small current flows through the sheathed heater, so power consumption can be reduced.

(2) During combustion, part of the combustion heat is recovered and the vaporizer is less likely to reach an unnecessarily high temperature, which reduces the number of times the vaporizer thermometer is turned on and off, thereby extending the life of the contacts. As the time increases, the noise also decreases.

FIG. 4 shows an electric circuit showing another embodiment of the present invention, which will be described below.

In the figure, SW is the ignition preparation switch, Th□ is the carburetor thermostat, S2 is the contact that switches from the NC side to the No side by excitation of the relay RL, 9 is the sheathed heater that preheats the carburetor, and S3 is the contact that is directly connected to the NC side. Or, the No side is a contact connected to the sheathed heater 9 via the reactor R, and this contact S3 is NC by the excitation of the relay RL, 3.
Switch from the side to the No side.

Ll is an ignition preparation lamp that lights up during ignition preparation, 86-1
is a contact that is turned off by excitation of relay RI4, 56-
2 is a contact that is turned on by excitation of relay RE@, 8 is a pump motor, T is an ignition transformer connected to a spark plug 10, rice is an ignition lamp that lights up when it is ready for ignition, S4 is frame rod 13
A contact that is turned on by excitation of relay RL of flame sight circuit 11 connected to.

SW2 is an ignition switch, 14 is an earthquake-resistant automatic device, Fl is a current fuse, Th2 is an overheating prevention thermostat, and F2 is an overheating temperature fuse.

Next, the operation of this embodiment will be explained.

Set the earthquake-resistant automatic fire extinguishing system 14 and turn the ignition preparation switch S
When W□ is turned on, relay RL2 is excited through carburetor thermo Th1, and contact S2 is switched from the NC side to the No side.

As a result, the sheathed heater 9 is energized and the vaporizer is heated, and the ignition preparation lamp L is lit to indicate that ignition preparation is in progress.

At this time, since the contact S3 is on the NC side, a large current flows through the sheathed heater 9, and the vaporizer is quickly heated.

When the vaporizer heats up to a predetermined temperature, the vaporizer thermometer Th1
is turned off, and contact S is closed due to demagnetization of relay RIJ2.
2 is switched to the NC side.

As a result, relay RL3 is energized and contact S3 is set to No.
At the same time, the ignition ready lamp h lights up.

Preheating is now complete and you can ignite at any time.

If the ignition operation is not performed at this point, the temperature of the carburetor will naturally drop, the carburetor thermometer Th1 will be turned on, and the ignition preparation will be made again, the sheathed heater 9 will be energized and the ignition preparation lamp island will be lit.

It goes without saying that at this time, the contact S3 is switched to the NC side.

On the other hand, while the ignition ready lamp L2 is lit, the ignition switch SW2
When turned on, relay RI is energized and contacts 56-1
is turned off, and the contact 56-2 is turned on.

This energizes the flame detection circuit 11 and starts flame detection.

At this time, since the ignition switch SW2 is a manual operation automatic return switch, the pump motor 8 and the ignition transformer T are energized only while the switch is pressed.

However, contact S is turned on by excitation of relay RL4 of flame detection circuit 11, so ignition switch SW2 is turned off.
The energized state is maintained even after 1.

A built-in timer stops discharging the ignition transformer T several seconds after it is energized.

If no flame is detected by the flame rod 13, the flame detection circuit 11 determines that there has been an ignition error, the relay RL is demagnetized, the contact S4 is turned off, and the rotation of the pump motor 8 is stopped.

At the same time, relays RL and 3 are demagnetized and contact 56-2 is turned off.

At this time, 56-1 is turned on at the same time, but contact S2 is NC.
Since the ignition preparation lamp L1 is on the side, the ignition preparation lamp L1 does not light up.

That is, the ignition preparation lamp L1 and the ignition ready lamp L2 are turned off together.

After that, the temperature of the vaporizer will drop naturally and the vaporizer thermo
When h□ turns on, relay RL2 is energized and contact S2
is switched to the No side, the sheathed heater 9 and the ignition preparation lamp are energized, and the ignition preparation state is resumed.

In this way, the ignition ready state and the ignition ready state are repeated.

The flame detection circuit 11 detects oxygen deficiency and poor combustion using the flame rod 13, and when an abnormality occurs, it acts in the same way as when there is an ignition error to prevent danger.

FIG. 5 shows the structure of the ignition preparation switch SW1 and ignition switch SW2 portion of the circuit, which will be explained below.

In the figure, reference numeral 15 is a knob that can be rotated counterclockwise to set the extinguishing position, ignition standby position, weak or strong combustion, and ignition position.
The control shafts 16 and 17 are integrally provided, and each control shaft 16, 17 is turned on with the ignition switch SW2 and the ignition preparation switch SW1, respectively.

An ignition spring 18 is wound around both control shafts 16 and 17 to automatically return the knob 15 and control shaft 16 clockwise from the ignition position to the strong combustion position.

The control shaft 17 has a pinion nut 1 as shown in the figure.
A pinion shaft 21 supported by a shaft holder 20 is connected via a pinion shaft 9, and a pinion 22 at the tip of the pinion 22 is engaged with a rack 24 integrated with a needle shaft 23. It is designed to open and close.

Note that 25 is a stop spring.

Next, the operation of this device will be explained.

When the knob 15 is turned from the extinguishing position to the ignition preparation position, the claw portion of the control shaft 17 is fixed by the stop ring 25, and the ignition preparation switch SW1 is turned on.
It becomes ready to ignite.

After that, when the ignition ready lamp L2 lights up, turn the knob 1.
5 in the counterclockwise direction to the ignition position, the control shaft 1
6 is in the state shown by the broken line in FIG. 5, and the ignition switch SW is turned on.
2 is turned on.

This energizes the ignition transformer T and starts discharging.

When the knob 15 is released, the knob 15 and the control shaft 16 automatically return to the strong combustion position due to the biasing force of the ignition spring 18.

As a result, the pressing force applied to the ignition switch SW2 by the control shaft 16 is released, and since the ignition switch SW2 is a manual operation automatic return contact, it is automatically turned off.

On the other hand, the amount of air-fuel mixture is determined by the position of the needle shaft 23 due to the rotation of the knob 15, and in the ignition preparation position, the flame detection circuit 11 operates and the circuit becomes the ignition preparation circuit configuration.

Further, when the knob 15 is turned counterclockwise, the needle shaft 23 moves to the right and a gap is created between it and the nozzle 3, and the vaporized kerosene under pressure due to the pump motor 8 and heating is blown out around the surrounding area. The air-fuel mixture enters the burner 2 shown in FIG. 1 together with air, and is ignited by the spark of the spark plug 10 to start combustion.

Thereafter, by turning the knob 15 clockwise, the gap between the nozzle 3 and the needle shaft 23 is adjusted, and the firepower is adjusted.

As explained above, according to this embodiment, the same effects as those of the previous embodiment can be expected, and the following unique effects can also be expected.

(1) Since the vaporizer thermostat keeps the vaporizer at a constant temperature, it is always ready for ignition, and hot air can be obtained immediately after the ignition operation.

Therefore, a complicated and expensive mechanism such as a conventional timer is not required.

(2) You can easily perform everything from ignition preparation to ignition and combustion adjustment (firepower adjustment) with one dial operation.

(3) During preheating before ignition, the nozzle that spouts kerosene gas is closed, so there is no leakage of kerosene gas and no odor.

In the above embodiments, the case where a sheathed heater is used for preheating the vaporizer has been described, but other sealed heating elements may be used.

[Effect of idea]

The present invention has been described above based on the preferred embodiments. According to the present invention, the preheating time of the vaporizer is short, and the power consumption of the closed heating element for preheating the vaporizer is low.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view showing one embodiment of the present invention, FIG. 2 is a side sectional view of the same, FIG. 3 is an electric circuit diagram thereof, and FIG. 4 is an electric circuit showing another embodiment of the present invention. FIG. 5 is a perspective view showing the configuration of the switch portion. 1... Carburizer, 3... Nozzle, 8...
... Pump motor, 9 ... Sheathed heater,
10... Spark plug, 11... Flame detection circuit, Th, Th1... Carburetor thermo, RL
l...Relay, S3...Contact, R...
...Reactor.

Claims (1)

[Scope of utility model registration request] a combustion circuit including a carburetor, a closed heating element for preheating the carburetor, a pump for supplying fuel to the carburetor, and an ignition transformer connected to a spark plug; energizing the sealed heating element when the temperature is low;
and a vaporizer thermostat that energizes the combustion circuit when the vaporizer temperature is higher than a set temperature, wherein the combustion circuit is provided with a relay whose operation is controlled by the vaporizer thermometer. The contact activated by this relay directly connects the NC side to N011! A vaporized liquid fuel combustion apparatus characterized in that each of the closed heating elements is connected in series with the closed heating element through a reactor.