JP3258458B2 - Hot water storage boiler - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot-water storage type boiler provided with a ventilation portion for heating combustion water in the hot-water storage tank by passing combustion gas from a burner inside the hot-water storage tank.

[0002]

2. Description of the Related Art In such a hot water storage type boiler, a ventilation part for passing hot gas from a burner to heat hot water in a hot water storage tank is provided.
Since it is provided inside the hot water storage tank, it has a feature that the external shape is compact while a large amount of hot water can be stored.

[0003]

However, when the burner is extinguished, a so-called draft occurs, in which air flows naturally through the ventilation section. When the draft occurs, the amount of heat stored in the hot water storage tank is radiated in the ventilation section with respect to the flow of air due to the draft, so that the temperature of the hot water stored in the hot water storage tank rapidly decreases, and thus, There is a problem that burner fuel consumption increases.

The present invention has been made in view of the above circumstances, and an object of the present invention is to prevent drafts generated when a burner is extinguished to save energy.

[0005]

A first characteristic configuration of the hot water storage type boiler according to the present invention is provided with closing means for interrupting the flow of air in the ventilation section, and the closing means is provided in accordance with the ignition of the burner. control means for closed state with the extinguishing of and the burner in a state opened Te is provided et al is, in the burner
A combustion air supply passage for guiding combustion air is provided,
< Desc / Clms Page number 3> is characterized in that a means for opening and closing the combustion air supply path is provided .

[0006]

A second characteristic configuration is provided with temperature detecting means for detecting the temperature of hot water in the hot water storage tank, and the control means sets the temperature of the hot water to a set temperature based on the detection information of the temperature detecting means. In this case, the burner is extinguished when the temperature becomes lower than the set temperature, and the burner is ignited.

[0008]

According to the first feature, the closing means is closed by the control means when the burner is extinguished, so that air is prevented from flowing through the ventilation section when the burner is extinguished. can do. Also provide closing means
In order to open and close the ventilation section,
Close and open the exhaust path connected to the ventilation
If means are provided, the closing means must be
Strict measures against the heat of the closing means due to contact
It is necessary to open the combustion air supply passage in the present invention.
Since the closing means is provided so as to close, the combustion air
The temperature of the combustion air flowing through the supply channel is low,
The countermeasure against the heat of the step is as described above.
Less strict than in direct contact with combustion gases
It will be. In other words, the closing means is heated and damaged
It can be provided in a state where it is suppressed.

[0009]

According to the second characteristic configuration, the burner is extinguished by the control means when the temperature of the hot water becomes higher than the set temperature, and the burner is ignited when the temperature of the hot water becomes lower than the set temperature. The temperature of the hot water is adjusted. When the burner is extinguished, the closing means is closed. In this case, the interval in which the burner is extinguished is longer than in the case where the temperature of hot water in the hot water tank is adjusted by adjusting the input amount to the burner.

[0011]

According to the first feature, the burner extinguishes the fire.
Closed to prevent drafts from occurring when
The closing means is controlled when the burner is ignited and extinguished.
It can be automatically opened and closed automatically by control means, and close means
Installed in the combustion air supply passage that guides combustion air to the burner
To prevent damage caused by heating.
Draft generated when the burner is extinguished
This has made it possible to properly prevent damage over a long period of time.
According to the second characteristic configuration, it is possible to further save energy in a hot-water storage type boiler in which the intervals at which the burners are extinguished are long.

[0012]

An embodiment will be described below with reference to the drawings. As shown in FIG. 1, a hot water tank 2 is provided inside an outer casing 1, and a burner 3 is provided below the hot water tank 2.
Is provided below the inside of the hot water storage tank 2. A combustion air supply path 6 for guiding combustion air to the burner 3 and a fuel gas supply path 7 for supplying fuel gas to the burner 3 are connected to the mixing chamber 3a of the burner 3, and the combustion air supply path 6 ,
The fan 5 is interposed. One end of a large number of smoke tubes 8 arranged inside the hot water storage tank 2 is connected to the combustion chamber 4, and the other end is connected to an exhaust passage 9.
Connected to In the figure, 10 is a water supply channel for supplying water to the hot water tank 2, 11 is a hot water supply channel for discharging hot water from the hot water tank 2, and 12 is a drainage channel for draining water from the hot water tank 2. Exterior casing 1
In order to take in combustion air to the ventilation and burner 3, a gallery 1a is formed.

In short, the combustion air is supplied from the fan 5 to the mixing chamber 3a through the combustion air supply path 6, while the fuel gas is supplied to the mixing chamber 3a through the fuel gas supply path 7, and the combustion air and the fuel are supplied. Gas and mixing chamber 3a
The mixed gas is uniformly dispersed by the flow straightening plate 3b, is ejected from each of the flame holes 3c into the combustion chamber 4 and burns, and the combustion gas is stored in the hot water tank 2 while passing through the smoke tube 8. After heating the hot and cold water, it is discharged to the outside through the exhaust passage 9. Therefore, the smoke tube 8 functions as a ventilation portion H that passes the combustion gas from the burner 3 and heats the hot water in the hot water storage tank 2.

As shown in FIGS. 2 and 3, a circular air inlet 6a of the combustion air supply passage 6 has an air inlet 6a.
A damper 14 for opening and closing a is provided. Damper 14
Is composed of a damper plate 14a rotatably provided around an axis P1 along the diameter of the circular air intake port 6a, and an electric motor 14b for driving the damper plate 14a to rotate.

As shown in FIG. 1, a temperature sensor 13 is provided as temperature detecting means for detecting the temperature of hot and cold water in the hot water storage tank 2. An electromagnetic on-off valve 15 is interposed in the fuel gas supply path 7. It is. Reference numeral 16 in FIG. 1 denotes a control device that controls various controls of the hot water storage type boiler. Hereinafter, control operations of the control device 16 will be described. It should be noted that the control device 16 corresponds to FIGS.
(A), a state in which the damper plate 14a is stationary in a state perpendicular to the opening surface direction of the air suction port 6a;
As shown in FIGS. 2 and 3 (b), the damper plate 14a
The operation of the electric motor 14b is controlled so as to reciprocally switch to a state in which the damper plate 14a is stationary in a state parallel to the opening surface direction, but in the following description, the damper plate 14a is moved in a state perpendicular to the opening surface direction. The stationary state is called an open state in which the combustion air supply path 6 is opened.
The state in which the combustion air supply path 6a is stopped in a state parallel to the opening surface direction is referred to as a closed state in which the combustion air supply path 6 is closed.

When an operation start is instructed from an operation switch (not shown), the control device 16 controls the electric motor 14b so that the damper plate 14a is in the open state, and opens the on-off valve 15, The fan 5 is operated, and an ignition plug (not shown) is operated to execute ignition control for igniting the burner 3.

Subsequently, when the temperature detected by the temperature sensor 13 reaches a predetermined set temperature, the on-off valve 15 is closed and the fan 5
Is stopped to extinguish the burner 3, and the electric motor 14b is controlled so that the damper plate 14a is in the closed state. Subsequently, when the temperature detected by the temperature sensor 13 becomes lower than the set temperature, the electric motor 14b is controlled so that the damper plate 14a is opened, and the ignition control is executed.

Thereafter, until the operation switch is instructed to stop the operation, the switching control of the open / closed state of the damper plate 14a based on the temperature detected by the temperature sensor 13 and the control of the burner 3 as described above. The ignition control /
The fire extinguishing control is performed. Subsequently, when an operation stop is instructed from the operation switch, the fire extinguishing control is executed and the electric motor 14b is controlled so that the damper plate 14a is in the closed state. Therefore, the damper 14
Functions as closing means S for shutting off the flow of air in the smoke tube 8, and the control device 16 sets the damper 14 to the open state with the ignition of the burner 3 and closes the damper 14 with the fire of the burner 3. It functions as control means for setting the state.

[Another Embodiment] Next, another embodiment will be described. The specific configuration of the ventilation portion H is not limited to the configuration of the above-described embodiment, and various configurations are possible. For example, a large number of heat transfer plates are provided on the outer peripheral portion of the meandering heat transfer tube through which the combustion gas flows. A heat exchanger provided with a.

Air inlet 6 a of combustion air supply passage 6
Is not limited to a circular shape as in the above-described embodiment, and various shapes are possible. For example, a square or a rectangle may be used.

The specific configuration of the closing means S is not limited to the configuration of the above embodiment, and various configurations are possible. For example, as shown in FIG.
The damper 17 may be a damper plate 17a that is provided so as to be swingable around the axis P2 along one side edge of a, and an electric motor 17b that swings and drives the damper plate 17a.

The closing means S may be provided so as to open and close the ventilation section H or may be provided so as to open and close the exhaust passage 9. However, as shown in the above embodiment, providing the combustion air supply passage 6 so as to open and close it is advantageous in terms of measures against heat since it does not come into contact with high-temperature combustion gas.

The arrangement position of the ventilation section H inside the hot water storage tank 2 can be appropriately changed. The combustion chamber 4 may be provided outside the hot water tank 2. The specific configuration of the burner 3 and the type of fuel can be appropriately changed.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the attached drawings.

[Brief description of the drawings]

FIG. 1 is a vertical right side view of a hot water storage type boiler according to an embodiment of the present invention.

FIG. 2 is a rear view of a closing means of the hot water storage type boiler.

FIG. 3 is a partially cutaway right side view of a closing means of the hot water storage type boiler.

FIG. 4 is a view showing closing means of a hot water storage type boiler according to another embodiment.

[Explanation of symbols]

 2 Hot water storage tank 3 Burner 6 Combustion air supply path 13 Temperature detection means 16 Control means H Vent section S Closing means

Claims (2)

(57) [Claims] 1. A hot water storage type boiler provided with a ventilation part (H) for passing combustion gas from a burner (3) and heating hot water in the hot water storage tank (2) inside the hot water storage tank (2). A closing means (S) for interrupting the flow of air in the ventilation section (H) is provided, and the closing means (S) is opened when the burner (3) is ignited, and the burner (3) is opened. Control means (16) for closing when fire is extinguished in 3)
Is provided et is, the combustion air supply passage for guiding the combustion air to the burner (3)
(6) is provided, and the closing means (S) is provided with the combustion air
A hot water storage type boiler provided to open and close the air supply passage (6) . 2. The temperature of hot water in the hot water storage tank (2) is detected.
Temperature detecting means (13) is provided.
6) is based on the detection information of the temperature detecting means (13).
When the temperature of the hot water reaches or exceeds a set temperature, the burner
(3) extinguish the fire, and the temperature of the hot water is the set temperature
Configured to ignite said burner (3) when lower
The hot water storage type boiler according to claim 1, wherein