JPH0223954Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] The present invention is a combustion device used in an instantaneous water heater, etc. The present invention relates to a horizontally installed combustion device in which burners are housed horizontally in multiple stages above and below, and these burners are provided with capacity switching valves.

[Prior Art] Conventionally, in this type of combustion apparatus, a throttle valve is generally used as a valve for switching burner capacity, and when switching to a low capacity, the flow of fuel gas to each burner is The structure was such that the supply was reduced (I can't provide any references).

[Problem that the invention attempts to solve]

However, when switching the burner capacity, it is necessary to supply fuel gas only to the upper burner among the burners stored in multiple upper and lower stages, or to switch the capacity by supplying fuel gas only to the lower burner. In this case, the problem is which of the upper and lower burners should be supplied with fuel gas.

In other words, if the configuration is such that fuel gas is supplied only to the upper stage burners when switching to a low capacity, the combustion flame that was originally upward will rise further upwards due to the fact that the combustion flame rises upward. Uniform heating over the entire surface of the cylindrical body becomes impossible, and efficient heat exchange becomes impossible, especially in water heaters that have a heat exchanger inside the cylindrical body. On top of that,
Since only the top surface of the cylindrical body is locally heated, disadvantages such as local deterioration of the cylindrical body and heat dissipation from the top surface of the cylindrical body are severe, resulting in poor thermal efficiency.

The purpose of this invention is to provide a type that switches capacity without using a complicated throttle valve, and to be able to heat almost uniformly over the entire surface of the cylindrical body even when switching to the lower capacity side. The object of the present invention is to provide a combustion device that can also avoid local heating of the cylindrical body.

[Means for solving problems]

In order to achieve this purpose, the horizontally installed combustion apparatus according to the present invention is configured to supply fuel gas to at least the lowest burner when the capacity is switched to a lower capacity by operating the capacity selector valve. characterized by something.

[Effect]

In this way, when switching to the low capacity side, the fuel gas is supplied to the lowest burner, so the fuel flame is located at the bottom and rises upward, eventually changing the flow path of the combustion gas. Since the flame is located near the center, almost uniform heating can be achieved over the entire surface of the cylindrical body.

[Effect of idea]

Therefore, in a type of combustion device that switches the capacity by switching the supply of fuel gas to burners arranged in multiple stages above and below, it is possible to achieve almost uniform and efficient heating regardless of the state of capacity switching. In addition, even when switching to the low capacity side, local heating of the cylindrical body and heat dissipation caused by it can be kept to a minimum.

〔Example〕

Next, an embodiment of the present invention will be described.

FIG. 6 is a plan view showing the schematic structure of a horizontally installed instantaneous water heater using the combustion device of the present invention, showing the water tube type water heating heat exchanger 1, A burner 2 for heating the combustion air and a fan 3 for forcing combustion air are equipped, and a fuel gas supply pipe 4 for the burner 2 is equipped with a safety solenoid valve 5, a gas governor 6, and a capacity switching solenoid valve 7. In addition, a water governor 9 and a water flow switch 10 are installed in the water supply pipe 8 to the water heating heat exchanger 1.
are interposed respectively.

A hot water supply pipe 11 from the water heating heat exchanger 1 is connected to a tap 13 via an extension pipe 12.

To explain the operation of this horizontally installed instantaneous water heater, based on the ON operation of the water flow switch 10 accompanying the opening operation of the hot water tap 13, the fan 3 is activated by the controller 14, and the safety solenoid valve 5 is opened. When operated, the spark plug 15A is activated and the burner 2 is ignited.

Also, based on the OFF operation of the water flow switch 10 accompanying the closing operation of the tap 13, the controller 1
4, the safety solenoid valve 5 is closed, the operated burner 2 is extinguished, and the fan 3 is stopped.

In the figure, 15B is a flame rod that detects the presence or absence of burner combustion flame.
Based on the detection results, the safety solenoid valve 5 is automatically shut off when a burner ignition error occurs, the burner goes out, or incomplete combustion occurs.

Regarding the specific assembly structure of the water heating heat exchanger 1, burner 2, and fan 3, as shown in FIGS. 1 to 4, the cross-sectional shape is rectangular,
In addition, a horizontally oriented cylindrical body 16 whose long side direction is substantially horizontal is provided, and the burner 2 is housed at one end side of the cylindrical body 16 in a horizontal position over almost the entire cross section of the cylindrical body 16. , a water tube type water heating heat exchanger 1 is installed at the opening on the other end side of the cylindrical body 16, and a burner 2 is installed inside the horizontal cylindrical body 16.
A horizontal combustion gas flow path F is provided from the water heating heat exchanger 1 to the water heating heat exchanger 1.

The burner 2 consists of two burners 2A, 2B arranged in upper and lower stages, and each of these burners 2A, 2
Fuel gas is supplied to B from the fuel gas supply pipe 4, respectively. At this time, when the capacity is switched to the high capacity side by operating the capacity switching solenoid valve 7, fuel gas is supplied to both burners 2A and 2B, and when the capacity is switched to the low capacity side, fuel gas is supplied only to the lower burner 2B. is configured to be supplied.

Therefore, of course, if the capacity is switched to the high capacity side by operating the capacity switching solenoid valve 7,
Even when switching to the low capacity side, the combustion flame generated from the lower stage burner 2B rises upward, so that the entire inside of the cylindrical body 16 is heated almost uniformly.

The cylindrical body 16 is divided into a burner housing part 16A and a combustion gas flow path forming part 16B, and both parts 16A and 16B are integrated by flange joining.

On the other hand, a cross-flow fan is used as the fan 3, and the cross-flow fan 3 is
is such that almost the entire fan 3 (including the fan case 3A) is accommodated in the virtual extended cylinder portion 16' at one end of the cylindrical body 16, and the fan rotation axis P has a rectangular cross-sectional shape in the cylindrical body 16. It is arranged along the long side direction.

That is, by setting the shape of the burner 2 and the water heating heat exchanger 1, the cross-sectional shape of the cylindrical body 16 is made into a rectangular shape with as large an aspect ratio as possible with the long side direction being almost horizontal. The cylindrical body 16 and the cross-flow fan 3 are arranged relative to each other so that the cross-sectional shape of the cross-flow fan 3 and the projected shape of the cross-flow fan 3 when viewed in the direction of the rotation radius overlap almost exactly in the direction of the cylinder axis of the cylindrical body 16. As a result, the overall configuration of the main part of the water heater consisting of the water heating heat exchanger 1, burner 2, and fan 3 can be made compact.
And, it is made into a small rectangular parallelepiped shape with a top and bottom thickness dimension d,
The overall structure of a horizontally installed instantaneous water heater has been made compact and thin.

In the figure, 17 is a motor for driving a cross-flow fan.

Burner storage portion 16 in horizontal cylindrical body 16
A hopper type wind guide 18 is integrally connected to the fan side opening of A, and the width of the hopper type wind guide 18 is formed to be narrower toward the fan side in terms of the dimension in the short side direction of the cross-sectional shape of the cylindrical body 16. A slit-shaped discharge port of the cross-flow fan 3 is connected to the fan-side slit-shaped opening of the cross-flow fan 3 .

In addition, punching plates 19 and 20 for regulating the air are stretched over the entire surface of each opening at the cylindrical body connection side opening and the fan side opening of the hopper type wind guide 18, and further, From the tongue part 3a of the fan casing 3A, there is a guide tongue piece with an inclined posture that guides and promotes dispersion of the discharge air from the fan 3 in the vertical thickness direction of the water heater (in the direction of the short side of the cross-sectional shape of the cylindrical body). 21 are arranged continuously over almost the entire length in the longitudinal direction of the fan casing 3A.

In other words, the two-stage punching plates 19 and 20 sufficiently convert the dynamic pressure of the fan discharge air into static pressure to equalize the velocity distribution of the combustion air, and the guide tongues 21 disperse the fan discharge air. By promoting these, as a cooperative effect, the combustion air supply state to the entire burner 2 is made uniform, and
Accordingly, the ventilation condition in the combustion gas flow path F in the cylindrical body 16 is made uniform, thereby maintaining a good combustion condition of the burner 2 and maintaining good heating efficiency in the water heating heat exchanger 1. It's like this.

Further, by applying the cross-flow fan 3, the distribution width of the fan discharged air is only the width of the short side of the rectangular cross-sectional shape of the cylindrical body 16, and the above-mentioned two-stage punching plates 19, 20 and Since a high air regulating effect is obtained by the guide tongue piece 21, the length of the hopper type wind guide 18 is considerably shortened, which also allows the main part of the water heater to be considerably miniaturized.

To explain the specific structure of the horizontal burner 2 installed in the burner housing portion 16A of the cylindrical body 16, as shown in FIGS. are arranged in parallel in two rows, upper and lower, over almost the entire cross section of the cylindrical burner storage portion 16A, and are connected to the fuel gas supply pipe 4 in the recesses of each of the bending plate members 19A. The burners 2A and 2B are arranged along the longitudinal direction of the bending plate member 19A.

The refracting plate member 19A has air jet ports a for ejecting combustion air toward the burners 2A and 2B, and the burners 2A and 2B have air jet ports a directed toward the inclined inner surfaces of the recesses in the refractive plate member 19A. In the past, the gas ejection port g that ejected fuel gas was connected to the bending plate-like member 1.
Air outlet a and gas outlet g are arranged alternately in the longitudinal direction of 9A.

In other words, due to the above-mentioned alternating arrangement, a swirling flow is generated in the space located between the air outlet a and the gas outlet g which are adjacent to each other as the combustion air and fuel gas are ejected. Therefore, the mixing effect of the jetted combustion air and the jetted fuel gas is enhanced to improve combustion performance.

In FIGS. 1 and 3, reference numeral 22 denotes a water heater exterior casing, and the exterior casing 22 also has a rectangular parallelepiped shape that is vertically thin due to the compactness and thinness of the main part of the water heater.

In the figure, 23 is a water supply joint, 24 is a hot water supply joint, 2
Reference numeral 5 denotes gas joints, which are respectively protruded from the upper surface of the water heater. Further, on one of the surfaces of the exterior casing 22 corresponding to the left and right side surfaces of the water heater, a cylindrical body 1 is provided.
The exhaust port 26 communicating with the exhaust side opening of No. 6 further includes:
Inlet ports 27 that communicate with the inlet ports of the cross-flow fan 3 are formed on the lower surface of the exterior casing 22 .

Further, 28 in the figure is a metal fitting for connecting and supporting a horizontally installed water heater to the lower surface of a hanging cabinet or the like.

A movable plate is provided near the punching type 19, and when the capacity is switched to the low capacity side by operating the capacity switching solenoid valve 7, this plate covers the part of the punching plate 19 corresponding to the upper burner 2A. It is also possible to carry out this by forcibly ventilating the entire amount of combustion air to the lower stage burner 2B side which is burning at low capacity.

The above explanation has been given using an example in which a combustion device consisting of a burner 2, a cylindrical body 16, etc. is applied to an instantaneous water heater. Needless to say, it can be applied to Also, the burner 2 is arranged in two stages, upper and lower, 2A and 2B.
Although the explanation has been given using an example in which the burners are arranged in three or more vertical stages, it is naturally possible to implement the burners in a structure in which the burners are arranged in three or more stages.

[Brief explanation of the drawing]

1 to 6 show an embodiment in which the combustion device of the present invention is applied to a water heater, in which FIG. 1 is a sectional view from the front, FIG. 2 is a sectional view from below, and FIG. 3 is a sectional view from the bottom. FIG. 4 is a sectional view taken along the - line in FIG. 1, FIG. 5 is an enlarged sectional view showing the burner configuration, and FIG. 6 is a schematic configuration diagram of the water heater. 2A, 2B... Burner, 7... Capacity switching valve, 1
6... Cylindrical body, F... Combustion gas flow path.

Claims (1)

[Scope of utility model registration request] A plurality of burners 2A, 2B are housed horizontally in a horizontal cylindrical body 16 forming a horizontal combustion gas flow path F, and in multiple upper and lower stages, and a capacity switching valve 7 is installed in these burners 2A, 2B. The horizontally installed type combustion device is configured to supply fuel gas to at least the lowest burner 2B when the capacity is switched to low capacity by operating the capacity switching valve 7. Stationary combustion equipment.