JPH03144214A - Vaporizing type oil burner - Google Patents

Abstract

PURPOSE:To enable regeneration of an evaporator by no-load burning to be performed effectively without causing any inconvenience in use of a burner, by preferentially performing a hot water supplying operation when a hot water supply instruction is received during no-load burning, and resuming the no-load burning upon completion of the hot water supply, thereby performing the two operations concurrently. CONSTITUTION:A burner 2 is provided in a casing 1 of a hot water supply device. A fan 3 and a heat exchanging part 4 for hot water supply are provided respectively at an upper part and a lower part in the casing 1. A burner is controlled by a remote control unit 20 and a controlling part 30 incorporating a microcomputer. An electromagnetic pump 8 stops running idle, and supplies an oil, whereby the oil is evaporated to be burned at a burner 2, and hot water supply is started. When the supply of hot water by suspending a no-load burning operation is finished, the no-load burning is resumed. The no-load burning is thus conducted by utilizing stand-by times when hot water is not supplied. When the total duration of no-load burning reaches a predetermined period of time, the no-load burning is completed. It is thereby possible to securely regenerate the evaporator by no-load burning.

Description

[Detailed description of the invention] <Industrial application field> The present invention relates to a petroleum vaporization water heater.

<Prior art and its issues> Petroleum vaporization hot water supply that gasifies petroleum fuel in a vaporizer, sends it to a burner and combusts it, and uses the generated heat to heat water passing through a heat exchange coil to supply hot water. The device has the disadvantage that tar adheres to and accumulates in the vaporizer, the passage from the vaporizer to the burner, the nozzle, etc., and as a result, the fuel supply to the burner becomes insufficient and the combustion power decreases. However, there was a problem that the vaporization in the vaporizer was poor.

As one of the means to solve this problem, a method of running the carburetor dry has been proposed (Japanese Patent Laid-Open No. 62-567
No. 11), and in the invention of Japanese Patent Application No. 1-221288, the present applicant has proposed that each time the number of times the device is operated reaches a certain number of times, or each time the operating time of the device reaches a certain time,
We provided a device that automatically runs the vaporizer in a dry state.

However, in these devices that automatically perform dry firing of the carburetor, sufficient consideration has not been given to how to set the timing to actually perform dry firing when the dry firing period is reached. That is, for example, if the dry firing operation is blindly started during a time period when the apparatus is frequently used, there is a problem that actual use becomes impossible during that time.

On the other hand, simply prioritizing the use of hot water makes it difficult to perform dry firing reliably.

Therefore, the present invention is designed to perform dry firing operation and hot water supply operation in good coexistence when the time for dry firing operation is reached in the vaporizer. The purpose of the present invention is to provide an oil vaporization type water heater that can reliably regenerate the vessel.

Means for Solving the Problems> In order to achieve the above object, the oil vaporization water heater of the present invention vaporizes oil in a vaporizer and then sends it to a burner to burn it, and at the same time, the generated heat is This is an oil vaporization water heater that heats water passing through a heat exchange pipe to supply hot water, and the vaporizer automatically performs a dry firing operation whenever certain conditions are met. In things,
If the water flow switch for hot water supply is turned on during a dry firing operation, priority is given to the hot water supply operation, and when the hot water supply operation ends, the dry heating operation is performed again, and the dry firing is performed for a certain period of time in total. It is said that Here, when a certain condition is satisfied, it means that the condition for performing dry firing operation of the carburetor is satisfied, for example, when the use of the carburetor for combustion reaches a certain number of times, when a certain period of time is reached, or This applies when it is determined that a certain amount of tar has adhered to the inside of the carburetor, or when it is determined that the combustion condition is poor.

According to the features of the present invention, even during dry-firing operation, if the water flow switch for hot water supply is turned on, dry-firing is temporarily stopped and the hot water supply mode is entered, so that there is no problem with hot water supply by the user. Moreover, once the hot water supply is finished, the dry firing operation is started again, and the dry firing operation is continued using the waiting time for hot water supply, and the predetermined dry firing operation time is completed. Therefore, tar content can be reliably removed by dry firing. That is, it is possible to ensure ease of use for the user and maintenance of the device by removing tar without interfering with each other.

<Example> Fig. 1 is an overall configuration diagram of an apparatus implementing the present invention, Fig. 2 is a flowchart showing an example of controlling the dry firing operation of a carburetor, and Fig. 3 (
A) and (B) are time charts showing control examples of the electromagnetic pump 8, respectively.

A burner 2 is provided in a case 1 of the water heater, a blower fan 3 is provided in the lower part, and a heat exchange part 4 for hot water supply is provided in the upper part of the case 1.

The vaporizer 5 is equipped with a heater 6 and an oil tank 7.
from the carburetor 5 through an oil supply pipe 9 by an electromagnetic pump 8.
The oil sent inside is vaporized there, becomes gas, and is sent to the burner 2 through the nozzle IO. The nozzle 10 is opened and closed by a needle valve 12 which is moved forward and backward by a solenoid 11. Due to repeated combustion, tar adheres and accumulates inside the vaporizer 5 and the nozzle lO, causing poor vaporization and poor combustion. Note that 13 is a return pipe for re-liquefied oil;
14 is an igniter, and 15 is a water flow switch. The device is controlled by a remote control 20 and a control unit 3 with a built-in microcomputer.
This is done by 0.

In operation of the device, the operation switch 21 of the remote controller 20 is pressed to turn on the switch, turn on the heater 6 via the control unit 30, and start preheating the vaporizer 5 by the heater 6. This preheating is a standby operation that allows the oil to vaporize smoothly without any delay when combustion actually starts. Preheating continues as long as the operation switch is on, regardless of whether combustion is occurring or not. It will be done.

Combustion occurs when the user opens a tap (not shown).
This is performed by inputting a combustion start signal from the water flow switch 15 to the control unit 30 when water starts flowing in at a flow rate higher than a certain level. In response to a control signal from the control unit 30, the blower fan 3 and electromagnetic pump 8 start driving, the solenoid 11 moves back the needle valve 12 and opens the nozzle 10, and the igniter 14 is activated, causing the vaporizer 5 to vaporize the air. The gas sent to the burner 2 is ignited and combustion begins.

When the hot water supply valve is closed, a combustion stop signal is sent from the water flow switch 15 to the control unit 30, and combustion is stopped. In this case as well, the preheating of the carburetor 5 is not stopped, but the preheating of the carburetor 5 is stopped at the same time when the operation switch 21 is pressed and turned off, or when the operation is stopped by an automatic operation stop signal. The automatic operation stop signal is a safety mechanism that automatically stops preheating the heater 6 and stops the operation of the device if a certain period of time passes without combustion after the operation switch is turned on. This is the signal.

Next, the dry firing operation control of the carburetor 5 by the control section 30 will be explained with reference to FIG.

Now, when the dry firing condition for the vaporizer 5 is established in the control unit 30 (step (a)), the control unit 30 first determines whether or not the water flow switch 15 is turned off (step (b)).
), if it is off, start dry firing operation (step (c)). In the dry firing operation, while heating the vaporizer 5 with the heater 6, the electromagnetic pump 8 is operated in a dry firing operation (sending air without pumping up oil), and the tar vaporized in the vaporizer 5 is discharged from the nozzle 10. To do this. The time of the dry firing operation is accumulated by the control unit 30. Then, when the water flow switch 15 is not turned on during the dry-burning operation (step (d)) and a predetermined dry-burning time (for example, a set time of several minutes) has elapsed (step (e)), the dry-burning operation is ended. (
Step (to)).

On the other hand, in step (d), when the water flow switch 15 is turned on during the dry baking operation, the dry baking operation is stopped (step (g)) and the hot water supply mode is started (step (h)). That is, the ventilation fan 3 starts rotating. Also, the temperature of the vaporizer 5 is adjusted for petroleum vaporization. Then, the electromagnetic pump 8 stops running dry and supplies oil. As a result, the oil is vaporized, combustion begins in the burner 2, and hot water supply begins.

Then, hot water supply during dry firing is turned off by turning off the water flow switch 15 (
When finished by step (su)) (step (nu))
, the dry firing operation is started again (step (c)), and the dry firing operation is carried out using the standby time when hot water is not being supplied, and the total dry firing operation time is within a predetermined period. The dry baking ends when the time reaches (
Step (to)).

Note that in the case where hot water supply is interrupted during the dry firing operation, the subsequent reheating may be performed again for the entire dry firing time.

Examples of control signals for the electromagnetic pump 8 are shown in FIGS. 3(A) and 3(B). When oil is fed by the electromagnetic pump 8, the plunger is moving in the middle of a full stroke when oil is actually being fed, but when the oil is being pumped dry, the plunger tends to collide with both ends, making a lot of noise.

Therefore, in the control example shown in FIG. 3(A), the electromagnetic pump 8 is controlled on-time at a constant frequency, and during dry pumping, the on-time is even smaller than when the oil input is small, so that plunger collision is prevented. The aim is to reduce the force of the noise and reduce the noise.

Further, in the control example shown in FIG. 3(B), the electromagnetic pump 8 is frequency-controlled with a constant on-time, and during dry pumping, it is operated at a lower frequency than when the oil input is large or when the oil input is small. As a result, although the loudness of each sound does not become smaller, the number of times of sound is reduced, and the sound can be particularly sensually reduced.

<Effects> The present invention has the above configuration, and according to the oil vaporization water heater according to claim 1, if there is a hot water supply command during dry firing operation, priority is given to hot water supply, and when hot water supply is finished, dry heating operation is resumed. As a result, the dry firing operation and the hot water supply operation can coexist well, and the effect is that the vaporizer regeneration by dry firing can be reliably carried out without causing any problems to the usability of the user. .

[Brief explanation of the drawing]

Fig. 1 is an overall configuration diagram of an apparatus implementing the present invention, Fig. 2 is a flowchart showing an example of controlling the dry firing operation of the carburetor, and Fig. 3 (
A) and (B) are time charts showing control examples of the electromagnetic pump, respectively. 2: Burner 4: Heat exchange section 5: Vaporizer 6: Heater 8: Electromagnetic pump 15: Water flow switch 30: Control section Fig. 1 Fig. 2 Fig. 3 (A) Fig. 3 CB) Enter Komaichi! Time to beat

Claims (1)

[Claims] (1) After the oil is vaporized in a vaporizer, it is sent to a burner where it is combusted, and the generated heat is used to heat the water passing through the heat exchange pipe to supply hot water. In a device that automatically performs dry firing operation of the vaporizer whenever certain conditions are met, if the water flow switch for hot water supply is turned on during dry firing operation, priority is given to hot water supply operation. The oil vaporization type hot water supply device is characterized in that it is configured to perform dry firing operation again after the hot water supply operation is completed, and to perform dry firing for a certain period of time in total.