JPH08200828A - Combustion equipment - Google Patents

Abstract

PURPOSE: To enable a poor combustion or a lost fire phenomenon to be prevented and further to enable a control circuit board to be sufficiently cooled without deteriorating a combustion efficiency even if air is present by a method wherein a front upper surface part of a front cover is formed with a gas discharging opening and a front suction port is opened near the gas discharging port. CONSTITUTION: Within a main body easing 21a and a front cover 22 are stored a combustion segment 23 for igniting an ignitable gas, a heat exchanger 24 for heating water passing in a pipe with combustion heat and a fan 25 for supplying combustion air to the combustion segment 23. In addition, a control circuit board 26 for controlling a solenoid valve and the like is stored in one side of the main body easing 21a, and a gas discharging passage 27 is defined and formed above the combustion segment 23. Then, a gas discharging port 28 communicating with the gas discharging passage 27 is opened at the front upper part of the front cover 22 and in turn, a front suction port 29 for sucking external air is opened at a front surface of the front cover 22 and near the discharging port 28. With such an arrangement as above, it is possible to restrict a poor combustion and a lost fire phenomenon and to cool the control circuit board 26 without deteriorating a combustion efficiency even under a state of air.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a burner such as a water heater or a bath with a water heater, and more particularly to a burner having an improved front cover structure.

[0002]

2. Description of the Related Art Conventionally, a combustion instrument of this type is shown in FIG.
It is configured as shown in FIG. As shown in the figure, the combustion instrument 1 includes a main body casing 1a and a front cover 2, inside of which a combustor 3 for combustible gas and heat of water passing through the pipe by combustion heat are heated. A heat exchanger 4 and a fan 5 that supplies combustion air to the combustion unit 3 are housed.

A control board 6 for controlling a solenoid valve (not shown) is provided on one side of the body casing 1a.
Is stored. Further, an exhaust passage 7 is formed above the combustion section 3.

As shown in FIGS. 3 and 4, an exhaust port 8 communicating with the exhaust passage 7 is opened in the upper front part of the front cover 2, and external air is sucked in the lower front part of the front cover 2. The front air inlet 9 is opened. A plurality of side intake ports 10 are opened on both side surfaces of the front cover 2, and an intake passage 11 is formed on the rear surface side thereof.
A partition wall 12 that partitions and forms is provided. This partition 1
The control board 6 is arranged on the side of the main body casing 1 corresponding to the position where it abuts on one side of the body 2.

In such a combustion instrument 1, the outside air is sucked into the intake ports 9 and 10 by operating the intake fan 5.
Is introduced into the main body casing 1a from the above, and the introduced air is supplied to the burner (not shown) of the combustion section 3 by the fan 5. The combustion section 3 is combusted by the air supplied from the fan 5, and its exhaust gas is discharged to the outside of the device through the exhaust passage 7 through the exhaust port 8.

[0006]

By the way, in the conventional combustion appliance 1, for example, the main body casing 1 is attached to the wall of the house.
Build-in type that is set by embedding a,
Alternatively, there are various types such as a stationary type that is set outdoors and set. Thus, when the combustion device 1 is placed outdoors, a normal combustion operation can be performed in a windless state.

However, there are cases where the combustion instrument 1 is placed in a windy condition as the external environment of the instrument. Even in such a case, if the wind equally hits both the exhaust port 8 at the upper front part of the front cover 2 and the intake port 9 at the lower front part, it is possible to burn in a state of almost no wind, and there is no problem. Does not occur.

However, as shown in FIG. 5, when the wind hits the front cover 2 from diagonally above,
The following problems occur. That is, the wind indicated by the arrow A enters the intake port 9 and the wind indicated by the arrow B indicates the exhaust port 8.
Sometimes it goes inside. In this case, the wind that has entered the intake port 9 in the direction of arrow A reaches the fan 5 side, but at the same time, the exhaust gas discharged from the exhaust port 8 is affected by the wind of arrow C, as indicated by arrow D. As a result, the air flows into the intake port 9 and returns. Therefore, there is a problem that exhaust gas is mixed into the combustion air, and the combustion is deteriorated due to a shortage of the combustion air, resulting in a phenomenon such as defective combustion or misfire.

In order to suppress the combustion failure and the misfire phenomenon, for example, it is necessary to use burners that burn normally even when the oxygen concentration in the air is lowered. Alternatively, it was necessary to simply increase the number of burners to relatively reduce the load on the flame mouth. Therefore, there is a demand for a simple means capable of suppressing defective combustion and misfiring without the need for an expensive burner using such a fire or an increase in the number of burners.

Further, in the structure of the conventional front cover 2, since the air sucked from the outside is hard to hit the control board 6, it cannot be cooled sufficiently, and if the heat sink is not enlarged, it may cause malfunction. There was a possibility that it could become.

The present invention has been made in order to solve the above-mentioned problems, and it is possible to suppress defective combustion and misfiring with a simple means without deteriorating the combustion efficiency even in a windy state, and It is an object of the present invention to provide a combustion instrument capable of sufficiently cooling a control board.

[0012]

According to the present invention, there is provided a combustion instrument in which an intake port and an exhaust port are opened in a front cover, the exhaust port being opened in an upper front portion of the front cover. , Which is achieved by a combustion instrument having a front air inlet opening in the vicinity thereof.

In the above structure, preferably, the front intake port is achieved by a combustion instrument opened at a position higher than the height of the exhaust port.

Further, preferably, it is achieved by a combustion device in which the front intake port is opened right next to the control board side with respect to the exhaust port.

Further, preferably, in addition to the above-mentioned front air intake port, it is achieved by a combustion instrument in which a plurality of air intake ports are opened around the front cover.

[0016]

According to the above-mentioned structure, the front intake port is opened in the vicinity of the exhaust port on the upper front surface of the front cover. Therefore, even when the wind hits the front cover from diagonally above, the exhaust gas from the exhaust port does not go around and return to the front intake port, so the exhaust gas does not mix with the combustion air and the combustion efficiency is improved. The deterioration of combustion and the misfire phenomenon can be suppressed without deteriorating.

Particularly, if the front intake port is opened at a position higher than the height of the exhaust port, the exhaust gas emitted from the exhaust port will circulate downward, so that the exhaust gas will surely be prevented from entering the front intake port. become.

Further, this front intake port is connected to the exhaust port,
If the openings are arranged side by side on the side of the control board, the control board housed behind the front cover is sufficiently cooled by the external air sucked from the front intake port.

Furthermore, by opening a plurality of intake ports around the front cover in addition to the front intake port, the outside air can be evenly sucked in through the plurality of intake ports without deteriorating the combustion efficiency. The combustion failure and the misfire phenomenon can be surely suppressed.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described in detail below with reference to the accompanying drawings. In addition, since the Examples described below are preferred specific examples of the present invention, various technically preferable limitations are given. However, the scope of the present invention particularly limits the present invention in the following description. The embodiment is not limited to these embodiments unless otherwise stated.

FIG. 1 shows an embodiment of a combustion instrument according to the present invention, (a) is a front view thereof, and (b) is a side view thereof. As shown in the figure, the combustion instrument 21 of this embodiment includes a main body casing 21a and a front cover 22, in which the same components as those of the conventional one are housed.

That is, inside the main body casing 21a and the front cover 22, a combustion section 2 for burning a combustible gas is provided.
3, a heat exchanger 24 that heats water passing through the pipe by combustion heat, and a fan 2 that supplies combustion air to the combustion unit 23
5 and 5 are stored. A control board 26 for controlling a solenoid valve (not shown) and the like is housed in one side of the main body casing 21a, and an exhaust passage 27 is formed above the combustion section 23.

The combustion instrument 21 of the present embodiment is characterized by the structure of its front cover 22, and is formed as follows. 2 is a perspective view schematically showing the back surface of the front cover of the combustion instrument of this embodiment. That is, the exhaust port 28 communicating with the exhaust passage 27 is opened in the upper front portion of the front cover 22 as in the conventional case. On the other hand, the front intake port 29 that sucks in the outside air
Is opened near the exhaust port 28 on the front surface of the front cover 22.

Specifically, it is preferable that the front intake port 29 is opened at a position higher than the height of the exhaust port 28 on the front surface of the front cover 22. This is the invention
This is because it is intended to prevent the combustion state from being adversely affected when the wind hits the front cover 2 from diagonally above when there is wind. That is, if the front intake port 29 is opened at a position higher than the height of the exhaust port 28, the exhaust gas flowing downward does not enter the front intake port 29.

In the present embodiment, particularly, the front intake port 2
9 is an exhaust port 28 in front of the front cover 22.
It is opened right next to the. Even just beside the exhaust port 28, it is opened on the side where the control board 26 is housed. This is intended to introduce the external air sucked from the front intake port 29 into the control board 26. Therefore, the exhaust port 28 is opened on the front side of the front cover 22 at a position deviated laterally from the axis of the front cover 22 on the side where the control board 26 is not present, because the front intake port 29 is opened right next to the exhaust port 28.

Further, the front intake port 29 is formed by assembling a plurality of small straight openings 29a in order to perform uniform intake. A louver (not shown) may be formed in each straight opening 29a in order to easily guide the external air sucked from the front intake port 29 to the control board 26.

A plurality of side inlets 30 and bottom inlets 3 are provided not only on both sides of the front cover 22 but also on the bottom.
3 is opened. On the back side of the front cover 22, a partition wall 32 that partitions and forms the intake passage 31 is provided. In particular, since it is extremely unlikely that exhaust gas is mixed in the outside air sucked from the bottom surface intake port 33, the intake air from the bottom surface intake port 33 is introduced into the fan introduction opening 32a of the partition wall 32. There is.

The control board 26 is arranged so as to abut one side of the partition wall 32 as in the conventional case. Not only the outside air sucked from the front intake port 29 but also the outside air sucked from the side intake port 30 and passing through the intake passage 31 are introduced into the control board 26, and is sufficiently cooled.

Next, the operation of the above embodiment will be described. In the combustion device 21 of the present embodiment, as in the conventional case, by operating the intake fan 25 housed in the main body casing 21a, the outside air is sucked into the front intake port 29, the side intake port 30, and the bottom intake port. 33 to body casing 1a
The air introduced into the inside is supplied to the burner (not shown) of the combustion section 23 by the fan 25, and the combustion section 23 is combusted by the air supplied from the fan 25. The exhaust gas is exhausted to the outside of the device through the exhaust port 28 through the exhaust passage 27.

In order to maintain such a normal combustion state by a simple means, the combustion instrument 21 of this embodiment has an improved structure of the front cover 22 and has the following operational effects.
That is, the stationary type combustion appliance 2 as in this embodiment
In the case of 1, when the wind hits the front cover 2 from diagonally above, the exhaust gas emitted from the exhaust port 28 goes around downward. However, the combustion instrument 21 of the present embodiment
By opening the front intake port 29 in the immediate vicinity of the exhaust port 28 at the upper front of the front cover 2, the exhaust gas that goes around downward when there is wind does not return to the front intake port 29, and thus is used as combustion air. Exhaust gas does not mix. Therefore, by a simple means of improving the structure of the front cover 22, the combustion air is sufficiently supplied to the combustion section 23, the normal combustion state is maintained without deteriorating the combustion efficiency, and the combustion failure and the misfire phenomenon are suppressed. Is something that can be done.

As described above, when the wind hits the front cover 2 from diagonally above, the exhaust gas from the exhaust port 28 wraps around downward, so that the combustion instrument 21 of this embodiment is used.
At the front of the front cover 2,
Since the exhaust gas is opened at a position higher than the height of the exhaust port 28, it is possible to reliably prevent the exhaust gas from flowing into the front intake port 29.

In particular, in the combustion instrument 21 of the present embodiment, the front intake port 29 is opened on the front side of the front cover 22 side by side with the exhaust port 28, and the control board 2 is provided.
Since 6 is opened to the side where it is stored, the external air sucked from the front intake port 29 is introduced into the control board 26 that is stored behind the front cover 22. Not only the external air sucked from the front air inlet 29 but also the external air sucked from the side air inlet 30 and passing through the intake passage 31 may sufficiently cool the control board 26 and cause malfunction thereof. Can be extremely low.

In addition to the front intake port 29, the combustion instrument 21 of this embodiment has a plurality of side intake ports 30 and bottom faces 33 not only on the side surfaces of the front cover 22 but also on the bottom surface. , These front intake ports 29, side intake ports 3
The outside air can be evenly sucked in from 0 and the bottom surface 33, the combustion efficiency can be normally maintained, and the combustion failure and the misfire phenomenon can be surely suppressed.

In particular, the outside air sucked from the bottom air inlet 33 is introduced into the fan 25 through the fan introduction opening 32a of the partition wall 32, so that it is highly possible that exhaust gas is mixed in this air. It is low and can reliably maintain the above-mentioned normal combustion state.

[0035]

As described above, according to the combustion device of the present invention, the combustion efficiency does not deteriorate even in a windy state, and the combustion failure is achieved by a simple means of improving the structure of the front cover. It also has an excellent effect that it is possible to suppress the phenomenon of fire and misfire, and also to sufficiently cool the control board.

[Brief description of drawings]

FIG. 1 shows an embodiment of a combustion instrument according to the present invention,
(A) is the front view, (b) is the side view.

FIG. 2 is a schematic perspective view showing the back surface of the front cover of the combustion instrument of this embodiment.

FIG. 3 is a front view schematically showing the internal structure of a conventional combustion appliance.

FIG. 4 is a schematic perspective view showing a back surface of a front cover in a conventional combustion device.

FIG. 5 is an explanatory diagram showing a windy state that adversely affects a stationary-type combustion appliance.

[Explanation of symbols]

 21 Combustion Equipment 21a Main Body Casing 22 Front Cover 23 Combustion Part 24 Heat Exchanger 25 Fan 26 Control Board 27 Exhaust Passage 28 Exhaust Port 29 Front Intake Port 30 Side Intake Port 29a Straight Opening 31 Intake Passage 32 Partition Wall 33 Bottom Intake Port

Claims (4)

[Claims] 1. A combustion instrument in which an intake port and an exhaust port are opened in front of a front cover, wherein an exhaust port is opened in an upper front part of the front cover, and a front intake port is opened in the vicinity thereof. Combustion appliances characterized by the above. 2. The combustion instrument according to claim 1, wherein the front intake port is opened at a position higher than the height of the exhaust port. 3. The combustion instrument according to claim 1, wherein the front intake port is opened right next to the control board side with respect to the exhaust port. 4. The combustion instrument according to claim 1, wherein, in addition to the front air intake port, a plurality of air intake ports are opened around the front cover.