JPS6124843Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a hot water boiler that uses a burner to spray liquid fuel onto a vaporization wall heated by an electric heater, vaporize and burn the liquid fuel.

The burner of the above hot water boiler is generally constructed as shown in FIG. In Figure 1,
Reference numeral 1 denotes a burner main body made of an aluminum alloy material, and has a vaporization wall 2a that forms a vaporization chamber 2 therein, and a combustion chamber wall 3a that forms a large-diameter combustion chamber 3. A heater 4 is embedded in the burner body 1 and is located on the vaporization chamber 2 side. 5 is a primary combustion air passage communicating with the combustion chamber 3; 6 is a fuel passage for supplying liquid fuel provided facing into the passage 5; 6a is the opening surface of this fuel passage 6 into the vaporization chamber 2; is integrally formed with the burner body 1, and includes a vaporization chamber 2 and a combustion chamber 3.
A secondary combustion air passage 8 rising through the center of the secondary combustion air passage 8 is formed by laminating a number of disc-shaped thin plates at a predetermined distance from each other, with a through hole 8a in the center and a through hole 8a in the periphery. 1 is a combustion plate on which a large number of flame ports 8b are formed;
0 is a holding plate that holds the combustion plate 8 between it and the aperture plate 9 having a through hole 9a smaller in diameter than the through hole 8a of the combustion plate 8, and constitutes a combustion plate assembly 11 together with the combustion plate 8 and the aperture plate 9. are doing. This combustion plate assembly 11 is attached by fixing the through hole 10a of the presser plate 10 to the outer wall of the passage 7 so that the throttle plate 9 is installed on the stepped portion of the burner body 1. Therefore,
The inside of the burner main body 1 is divided into the vaporization chamber 2 and the combustion chamber 3 by the throttle plate 9, and the flame port 8b is installed facing the combustion chamber wall 3a. 12 is a bowl-shaped air guide that guides the secondary combustion air from the passage 7 to the vicinity of the burner port 8b; 13 is a spark plug that ignites the air-fuel mixture flowing out from the burner port 8b; and 14 is a sensor that detects the temperature of the burner body 1. This is a thermostat that opens and closes the heater 4.

In the burner configured in this way, when starting, first, the heater 4 is energized through the contacts of the thermostat 14 to heat the burner body 1, and when the burner body 1 reaches a predetermined temperature, the thermostat 14 is turned on.
By stopping the energization of the heater and blowing primary combustion air into the vaporization chamber 2 through the passage 5 at high speed, the liquid fuel is suctioned and atomized by the suction force acting on the opening surface 6a of the fuel passage 6. The atomized liquid fuel is heated by the vaporization wall 2a, and in the process of swirling in the vaporization chamber 2, it vaporizes and mixes with the primary combustion air to form an air-fuel mixture that passes through the through holes 9a,
The flame reaches the flame outlet 8b via the flame outlet 8a, and is ignited by the spark plug 13, forming a primary flame 15 near the flame outlet 8b. On the other hand, the air for secondary combustion supplied through the passage 7 is distributed to the vicinity of the flame port 8b by the air guide 12, and a secondary flame 16 of complete combustion is formed in the air. A part of the combustion heat from this flame is transmitted to the burner 1 via the combustion chamber wall 3a, so once combustion starts, the temperature of the vaporization wall 2a is high enough to vaporize the liquid fuel even if the heater 4 is not energized. It is designed to ensure that

A hot water boiler using this type of burner is
It is used in the configuration shown in the figure. In FIG. 2, 17 is a boiler body that stores water 18 inside, 17a is a hot water outlet provided at the top, 17b is a water supply port, 17c is a burner flange that connects the boiler body 17 and burner 1, and 17d is a burner 1 A heat exchanger 17e exchanges heat generated by the boiler with water 18 in the boiler body 17, and a heat exchanger 17e is an exhaust port that discharges the heat-exchanged combustion gas to the outside. 19 is attached to the side wall of the boiler body 17 to detect the temperature of the water 18;
A hot water temperature thermostat for operating and stopping the burner 1, 20 is a pipe connected to the hot water outlet 17a, 21
is a faucet.

Such a configuration is an example of using a hot water boiler for hot water supply; the water 18 in the boiler body 17 is heated by operating the burner 1, and when it reaches a predetermined temperature, the hot water temperature thermostat 1 is activated.
9 is activated and the operation of burner 1 is stopped. Faucet 2
When hot water is discharged from 1, water 18 in the boiler body 17
The temperature of the water is lowered by the water supplied from the water supply port 17b, the hot water temperature thermostat 19 is activated, and the burner 1 is started to be heated.

A hot water boiler using a burner as shown in Figure 1 is used with the configuration shown in Figure 2.
As a control method for these configurations, the method shown in FIG. 3 or 4 was used. In Figures 3 and 4, 22 is a boiler operation switch, 14 is a thermostat that detects the temperature of burner 1, and when the burner temperature is low, the circuit is closed to contact 14b, and the burner temperature reaches a predetermined value. At this time, the circuit is closed to the contact 14a side.

When the control method shown in FIG. 3 is used for hot water supply as shown in FIG. 2, the operation pattern will be as shown in FIG. 5. That is, when the operation switch 22 is turned on at time S, the heater 4 is energized through the contact 14b of the thermostat 14, and the burner temperature TB rises.When this reaches _TB1 , the contact 14b of the thermostat 14 is opened and the contact is closed. 14a is closed, power supply to the heater 4 is stopped, and the hot water temperature thermostat 19
Burner 1 is operated through. The temperature TW of water 18 in the boiler body 17 is determined by the hot water temperature thermostat 19 as the burner 1 is operated.
When TW ₁ is reached, the hot water temperature thermostat 19 opens and the operation of the burner 1 is stopped. Note that while the burner 1 is burning, the burner temperature is stable at a temperature higher than the temperature TB ₁ at which the contact 14b of the thermostat 14 opens, as shown in the figure, and as soon as combustion stops, the burner temperature TB decreases and the burner temperature increases. When TB drops to ₂ , the thermostat 14b closes and energizes the heater 4, increasing the burner temperature TB and lowering the burner temperature.
When TB reaches TB ₁ , power supply to the heater 4 is stopped. In this way, the burner temperature TB is always kept at a temperature that vaporizes the liquid fuel. If a large amount of hot water is released from the faucet 21 in this condition, the water supply port 1
7b, the temperature of the hot water thermostat 19 attached to the boiler body 17 decreases, and when the thermostat 19 closes, the burner 1 starts immediately, so the temperature of the hot water discharged from the faucet 21 is It can always emit hot water. In other words, in FIG. 5, when a larger amount of hot water is dispensed than point A, the hot water temperature thermostat 19 of the boiler body 17 closes at point B, where cold water is detected, and at the same time the burner 1 starts combustion, so the faucet 21 always The water 1 in the boiler main body 17 is discharged between point C, where hot water is stopped, and point D, where combustion stops.
8 is heated to the set temperature of the hot water thermostat 19. In addition, if a small amount of hot water is intermittently supplied from the faucet 21, the boiler body 17
When the cold water reaches the position of the hot water temperature thermostat 19, the hot water temperature thermostat 19 closes and the burner 1
is burned and heated.

With this control method, even if a large amount of hot water is dispensed all at once, or a small amount is dispensed intermittently, the hot water can always be dispensed at a temperature determined by the temperature set on the hot water thermostat 19. Since the heater 4 is always energized to keep the temperature of the burner 1 at a high temperature even when hot water is not being dispensed, that is, even when there is no need to burn the burner 1, there is a drawback that power is wasted.

FIG. 4 shows another control method, and FIG. 6 shows its operation pattern. Power switch 22
When closed, the heater 4 is energized through the contact 14b of the thermostat 14 that detects the burner temperature.
When the burner temperature increases and reaches a temperature at which the contact 14b is opened and the contact 14a is closed, the heater 4 is opened and the burner 1 starts combustion. When combustion starts, the water 18 in the boiler body 17 is heated, and when the temperature reaches the set temperature of the hot water temperature thermostat 19, the hot water temperature thermostat 19 opens and the combustion is stopped. When the hot water temperature thermostat 19 is opened, combustion stops and the heater 4 is not energized, so the burner temperature TB drops to room temperature. When a large amount of hot water is dispensed from the faucet 21 at point A, where the burner temperature TB has dropped to almost room temperature, the hot water temperature thermostat 19 detects cold water at point B and closes the circuit, energizing the heater 4 and heating the burner 1. begins to However, the temperature of burner 1
If the TB discharges all the hot water in the boiler body 17 before the contact 14b of the thermostat 14 is closed, water will be discharged from the faucet 21 as shown at point C. When the burner temperature TB rises after point D when the faucet 21 is closed, the contact 14b opens, and when the contact 14a closes, the burner 1 starts combustion and reaches point E, heating the water in the boiler body 17. . However, if a small amount of hot water is dispensed intermittently, hot water can always be discharged as shown after point F. In other words, in this control method, if the temperature TB of the burner 1 rises until all the hot water stored in the boiler body 17 is dispensed, and the contact 14a closes and combustion starts, hot water is dispensed from the faucet 21, but this is not the case. Otherwise, cold water will be discharged from the faucet 21.

The control method shown in FIG. 4 energizes the heater 4 only when it is necessary to burn the burner, so the power consumption of the heater 4 is reduced, but cold water may be discharged if a large amount of hot water is dispensed. In order to eliminate this runner-up problem, the burner body should be made larger,
In addition to being able to store a large amount of hot water, the burner temperature TB can be controlled by thermostat 14a by increasing the combustion amount of burner 1 or by increasing the power of heater 4.
It is necessary to shorten the heating time until the circuit is closed, and both of these methods have the disadvantage of increasing manufacturing costs.

This idea was made to eliminate the drawbacks of the conventional ones as mentioned above, and it consumes less power.
It is an object of the present invention to provide a hot water boiler that does not discharge cold water even when a relatively large amount of hot water is dispensed.

An embodiment of the present invention shown in FIG. 7 will be described below. In the figure, 23 is thermostat 1
4, it is a second thermostat that operates by detecting the burner temperature TB, and the contacts 23a and 23b
23b is closed when the burner temperature is low, and 23a is closed when the burner temperature is high, but the operating temperatures of these are set to a value lower than the operating temperature of the thermostat 14. 19 is another contact point of the hot water temperature thermostat 19, and its operation is exactly the same as that of the hot water temperature thermostat 19. Reference numeral 24 denotes a control method changeover switch, which will be described later.

The operation of such a control circuit will be explained as follows when the control method changeover switch 24 is open.

When the operation switch 22 is closed, the burner temperature TB
Since the contact point 23b and 14b are closed, the heater 4 is energized and the burner temperature TB rises.When the contact point 23b is opened and the contact point 23a is closed, the heater 4 is further turned on through the hot water temperature thermostat 19. 4 is energized, the burner temperature TB rises, and when the burner temperature TB reaches TB ₁ , contact 14
b is opened, the contact 14a is closed, and at the same time the heater 4 is de-energized, the burner 1 is energized through the hot water temperature thermostat 19, so the burner 1 starts combustion and raises the hot water temperature. When the hot water temperature thermostat 19 is opened, the burner 1 stops combustion. While the burner is stopped, the burner temperature TB gradually decreases, the thermostat 14a opens, and the thermostat 14b
becomes a closed circuit. When the temperature decreases further, the second thermostat 23a opens and the second thermostat 23b closes, energizing the heater 4 and increasing the burner temperature TB.
When 3b is opened, the heater 4 is de-energized.

In other words, this control method maintains the burner temperature at a temperature determined by the second thermostat 23 during combustion stop;
Since the temperature is lower than the temperature of
9 and 19' detect cold water, the time required to heat the burner temperature TB to the temperature TB ₁ at which the thermostat 14 operates is short, so the faucet 2 is turned off as shown in FIG.
No colder water will be released than 1.

Further, when the switch 24 is closed, its operation is the same as that shown in FIG. 3 described above, so a description thereof will be omitted.

As described above, according to this invention, when the liquid fuel burner is off, the burner body is controlled to the preheating temperature, so power consumption is reduced when the liquid fuel burner is off, and even if a relatively large amount of hot water is dispensed, no cold water is released. You can drive without worrying. In addition, a switch element is connected in parallel to the thermostat that controls the electric heater on and off.
By turning it on, the temperature of the burner body can always be maintained at a temperature that vaporizes the liquid fuel even in the case of a thermostat failure, and the desired hot water can always be obtained, which has the effect of improving reliability.

[Brief explanation of the drawing]

Figure 1 is a sectional view showing a liquid fuel burner, Figure 2 is a configuration diagram showing a hot water boiler, Figures 3 and 4.
5 is a circuit diagram showing a control circuit of a conventional hot water boiler, FIGS. 5 and 6 are operation pattern diagrams of the conventional hot water boiler, and FIG. 7 is a circuit diagram showing an embodiment of the invention. In the figure, 1 is a liquid fuel burner, 4 is an electric heater, 14 and 23 are thermostats, 17 is a boiler body, 19 is a hot water temperature thermostat, and 24 is a switch. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] In a hot water boiler whose heat source is a liquid fuel burner that heats a burner body with an electric heater, sprays liquid fuel into the heated burner body, vaporizes and burns it, and operates according to the hot water temperature of the hot water boiler. a first thermostat that operates according to the temperature of the burner body and controls the liquid fuel burner on and off in cooperation with the hot water temperature thermostat; A second thermostat is provided that operates at a temperature of the burner body lower than the operating temperature of the first thermostat, controls on/off of the electric heater, and preheats the burner body, and a switch element is provided in parallel with the second thermostat. A hot water boiler characterized by being connected to.