JP2979376B2 - Water heater - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water heater, and more particularly to a water heater that is installed in an indoor kitchen room, sucks combustion air from the room, and discharges combustion exhaust from an exhaust pipe to the outside. It is.

[0002]

2. Description of the Related Art This type of water heater has a large heat exchange capacity, and accordingly the amount of gas burner combustion is set large. Therefore, most of recent water heaters of this type employ a forced combustion system. When such a water heater is installed in a kitchen room with many oil dishes such as Chinese food, oil smoke generated in this kind of kitchen room is forcibly sucked into the combustion chamber in the water heater.

Usually, in this type of conventional water heater, an air suction portion (air supply port) is formed at the bottom of the casing of the water heater, so that the air inlet is close to the oil smoke generating portion, and the air suction portion is located close to the oil smoke generating portion. Oil smoke is sucked into the air inlet as it is. Therefore, in this type of water heater, the oil component in the oil smoke tends to adhere to the path from the air supply port to the combustion chamber. In addition, dust and dust easily adhere to this oil component. Due to continued use in this state, if the amount of the oil component or dust exceeds the limit, poor combustion is caused. Therefore, in order to prevent such poor combustion and maintain good combustion, it was necessary to frequently clean the air supply path.

On the other hand, since the state of the air supply path in the casing is difficult to judge from the outside, the cleaning may be delayed, and in such a case, the state of poor combustion may continue. The present invention has been made in view of such a point, and in a water heater having a built-in forced-supply / exhaust-type combustion device, even if it is installed in a kitchen room where oil smoke or the like is likely to occur,
It is an object of the present invention to make it difficult for air containing an oil component to be sucked and to easily determine a state that requires cleaning.

[0005]

The technical means of the present invention for solving the above-mentioned problem is as follows: "The downstream end of the combustion air supply circuit (2) is
An air supply port (21) at the upstream end of the air supply circuit (2) is connected to a suction port of an air supply fan (F) connected to the combustion chamber.
Is provided above a position corresponding to the upper end of the heat exchanger (10) on the front surface of the casing (1), and the air supply circuit (2) is formed in the casing (1) as an independent duct. A horizontal path (2a) extending from the air supply port (21) to a rear portion of the casing (1) through an upper region of the heat exchanger (10); and the horizontal path (2a).
Descending path (2b) descending between the heat exchanger (10) and the rear wall of the casing (1) following the rear end of
From the lower end of the descending path (2b) to the air supply fan (F)
And a connecting cylinder (2c) reaching the suction port of the casing (1), and an exhaust pipe (3) connected to the heat exchanger (10) penetrates the horizontal path (2a).
And a wire mesh filter (4) is detachably attached to the air supply port (21). "

[0006]

The above technical means operates as follows. The air for combustion is supplied to the air inlet (2) above the front surface of the casing (1) and above the position corresponding to the upper end of the heat exchanger (10).
It is sucked through the filter (4) attached to 1). Usually, this type of water heater is installed on the side wall of the kitchen room and near the ceiling. Therefore, the air supply port (21) provided at the upper front part of the casing (1) has a relatively high position even in the kitchen room. Become. Therefore, even if oil smoke or the like is generated, the air supply port (2
Oil smoke does not directly reach 1).

Further, air containing an oil component is supplied to the air supply port (2).
Even if it is sucked from 1), it is liquefied in this part by contact with the wire mesh filter (4). When the amount of liquefaction increases, the suction area of the air supply port (21) decreases. However, since the filter (4) is located at the upper part of the front surface of the casing (1), this can be easily determined. This is because when the oil component adheres to the wire mesh and the amount increases, the surface of the wire mesh of the filter (4) changes to the color of the oil component.

The air sucked from the air supply port (21) is supplied to the horizontal path (2a) in the upper part of the heat exchanger (10),
The heat exchanger (10) and the descending path (2
b) and the suction port of the air supply fan (F) via the connection tube (2c). Therefore, the exhaust pipe (3) penetrating the horizontal path (2a) above the heat exchanger (10) is air-cooled by air supply passing through the outer periphery of the exhaust pipe (3).
The heat exchanger (10) and the combustion chamber connected to the heat exchanger (10) are likely to be at a high temperature.
An air supply circuit (2) formed in a duct shape independent of the casing (1) is interposed between the upper wall and the rear wall of the kitchen, and the water heater is attached near the ceiling of the wall surface of the kitchen room. Even if it is fixed, the radiant heat and conduction heat from the heat exchanger (10) and the combustion chamber are cut off by the horizontal path (2a) and the descending path (2b) of the air supply circuit (2). That is, the air is insulated.

[0009]

[Effect] Since it is difficult for oil smoke or the like to directly enter the air supply port (21), poor combustion due to suction of a large amount of oil components is unlikely to occur. Even if oil smoke or the like enters from the air supply port (21), the air supply circuit (2) is formed in an independent duct shape in the casing (1), and the air supply fan (F)
The oil smoke and the like do not leak from the air supply circuit (2) because of the suction. When the water heater is used, the filter (4) is attached to the wire mesh of the filter (4) due to oil adhesion.
Is discolored as a whole, but the degree of the discoloration makes it possible to judge the amount of the oil component attached. Therefore, it is easy to prevent poor combustion by removing the oil component and cleaning it at a stage where poor combustion does not occur.

Since the heat exchanger (10) and the combustion chamber and the ceiling and wall surfaces of the water heater are securely insulated from the air by a duct-shaped air supply circuit (2) independent of the casing (1). Overheating of the ceiling surface and the wall surface of the water heater can be prevented.

[0011]

Next, an embodiment of the present invention will be described in detail with reference to the drawings. Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the water heater of this embodiment, as shown in FIGS. 1 to 6, a combustion chamber (1) is provided below a can body (11) having a heat exchanger (10).
2) is formed, and the discharge port of the air supply fan (F) is opened at the bottom of the combustion chamber (12). A downstream end of an air supply circuit (2) is connected to a suction port of the air supply fan (F), and an exhaust collecting section provided with an exhaust pipe (3) is provided at an upper end of the heat exchanger (10). It is installed continuously.

The can body (11) is housed in a casing (1) having a vertically long rectangular parallelepiped shape so as to have a certain distance from the constituent walls thereof. The vent (21) opens. The air supply circuit (2)
From (21) to the exhaust collector at the upper end of the can body (11) and the casing
Heat exchanger (10) and casing (1) through the top plate of (1)
The horizontal path (2a) reaching the rear wall of the
Following the rear end of (2a), a descending path (2b) descending between the can body (11) and the back wall of the casing (1), and a lower end of the descending path (2b) and an air supply fan (F). And a connection cylinder (2c) for connecting the suction port. The cross-sectional shapes of the horizontal path (2a) and the descending path (2b) are set to be flat rectangles.

An exhaust pipe (3) is connected to the upper end of the can body (11), and the combustion exhaust gas from the combustion chamber (12) below the can body (11) is supplied to the heat exchanger (10). After heat exchange in the part, this can (1
It is discharged to the outside via the exhaust pipe (3) communicating with (1). The exhaust pipe (3) penetrates the flat horizontal path (2a) and protrudes upward from the top plate of the casing (1). Then, when the apparatus is installed, an exhaust flue (not shown) is connected to the exhaust pipe (3). By arranging the exhaust flue in a predetermined route, the combustion exhaust is discharged from the exhaust flue to the outside.

The air supply port (21) is provided with a filter (4) shown in FIGS. This filter (4) is formed in a horizontally long rectangle as a whole, and the filter frame (41)
And a filter body (42) detachably attached to the filter body. The filter main body (42) has a configuration in which a dish-shaped wire mesh (43) projecting to one side is stretched in a frame (42a), and the periphery of the wire mesh (43) is fixed to the frame (42a). ing.

The filter frame (41) is a flat dish-like body for accommodating the filter body (42) so as to be able to move a predetermined distance in the long side direction, and a portion corresponding to the bottom outer surface of the dish-like body is a filter (41). 4), and this front part has 4
One long hole is formed. In order to removably couple the filter frame (41) to the filter body (42), a pair of notches (44) (44) are formed on each long side of the frame (42a). On the peripheral wall of the filter frame (41) accommodating the filter body (42), the engaging tongue pieces (45) (4)
5) protrudes inward. Therefore, the engaging tongue (45)
The filter body (42) is accommodated in the filter frame (41) with the cutouts (44) and (44) aligned with (45), and then the filter body (42) is slid in the longitudinal direction. Then, the engaging tongues (45) and (45) engage and hold the long sides of the filter body (42), and are assembled together to form the filter (4). By the reverse procedure, the filter main body (42) can be removed from the filter frame (41).

[0016] The filter (4) having the above-described structure is used for the casing (1).
It is removably attached to a recessed step (13) formed on the outer periphery of the air supply port (21) on the front surface. Therefore, the concave step
The size of (13) is set slightly larger than that of the filter (4), and a pair of long holes (15) (15) is formed on one of its short sides. On one of the short sides of the other filter (4), a pair of engaging tongues (46) (46) that are fitted and engaged with the long holes (15) (15) are formed so as to protrude. A horizontally long engaging claw (51) is provided on the central inner surface on the short side of the. The engaging claw (51) is connected to the operation knob (52) via a shaft that penetrates a horizontally long slot formed in the front plate of the filter frame (41) and projects to the outer surface side of the filter (4). Have been. Therefore, the engaging claw (51) can move within a certain range along the longitudinal direction of the filter (4).

When the filter (4) having the above structure is accommodated in the recessed step (13) and the engaging claw (51) is located at the innermost position, the tip of the filter (4) is positioned at the recessed step (13). In a state in which the engagement claw (51) is located outside the short side and the engagement claw (51) is located on the outermost side, the front end thereof is located outside the inner edge of the recessed step (13). Thus, the range of movement of the engagement claw (51) is set. When the filter (4) is mounted, the engaging claw (51) has its front end protruding toward the inner surface of the recessed step (13). A predetermined space is left between the inner surface of the face plate.

With the above construction, the operating knob (52) is pushed inward to set the engaging claw (51) at the innermost position, and in this state, the engaging tongue is inserted into the elongated holes (15) (15). After inserting the pieces (46) and (46) and storing the filter (4) in the recessed step (13), push out the operation knob (52) to the outside to engage the engaging claw (51).
Move together with this, and the tip of the engaging claw (51) protrudes toward the inner surface of the short side of the recessed step (13). As a result, the filter (4) is housed and fixed in the recessed step (13) connected to the outer periphery of the air supply port (21) by the engaging tongues (46) (46) and the engaging claws (51). You.

The water heater of the above embodiment is used while being attached to and fixed to the wall surface of the kitchen room. At this time, since the air supply port (21) is located at the upper part of the front surface of the casing (1), oil smoke and the like generated in the kitchen room do not directly reach the air supply port (21). Also, when the combustion air is sucked from the air supply port (21),
The oil component therein is first liquefied by the wire mesh (43) of the filter (4) and tends to accumulate there. Since this is the upper part of the front surface of the casing (1), and since the portion of the wire mesh (43) can be seen through from the outside, the amount of oil components, dirt, and dust attached to the wire mesh (43) due to the degree of dirt is reduced. Can be guessed to some extent.

If it is determined that the amount of the oil component or the like has reached a predetermined amount, the operating knob (52) is operated to move the engaging claw (51) and the edge of the recessed step (13). Disengage,
Remove the filter (4) from the casing (1) and clean it. During the operation of the water heater, the air supply fan (F) is in an operating state, and is drawn into the air supply fan (F) from the air supply port (21) via the air supply circuit (2), and the combustion air is supplied to the combustion chamber. Is supplied, and the combustion device built therein becomes a combustion state,
Heat is exchanged in the heat exchanger (10) above the hot water, so that hot water is taken out from the outlet of the hot water supply path, and the combustion exhaust gas is discharged from the exhaust pipe (3) to the outside via the exhaust flue.

At this time, the horizontal path (2a) and the descending path (2b) of the air supply circuit (2) exhibit a heat insulating effect against heat radiation from the combustion chamber (12) and the heat exchanger (10).
Overheating of the ceiling of the kitchen room and the wall where the equipment is installed can be prevented. still,
In the above embodiment, the combustion state in the combustion chamber (12) can be visually observed from the viewing window (19) at the center of the front of the casing (1).

[Brief description of the drawings]

FIG. 1 is a front external view of an embodiment of the present invention.

FIG. 2 is a rear view

FIG. 3 is a right side view

FIG. 4 is a plan view

FIG. 5 is a bottom view

FIG. 6 is a sectional view taken along line XX.

FIG. 7 is a front view of the filter (4).

FIG. 8 is a rear view thereof.

FIG. 9 is a plan view showing the relationship with the recessed step (13).

FIG. 10 is a right side view.

FIG. 11 is a left side view.

FIG. 12 is a sectional view taken along the line YY.

FIG. 13 is a sectional view taken along the line ZZ.

FIG. 14 is a cross-sectional view of a part of the viewing window (19).

[Explanation of symbols]

 (2) ... air supply circuit (F) ... air supply fan (21) ... air supply port (1) ... casing (10) ... heat exchanger (3) ... exhaust Cylinder (4) ・ ・ ・ Filter

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-193861 (JP, A) JP-A-6-34203 (JP, A) JP-A-3-52553 (JP, U) JP-A 5-52553 25140 (JP, U) Japanese Utility Model 7-22360 (JP, U) Japanese Utility Model 63-129157 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F24H 9/02 301

Claims (1)

(57) [Claims] 1. A downstream end of a combustion air supply circuit (2) is connected to a suction port of an air supply fan (F) connected to a combustion chamber, and an upstream side of the air supply circuit (2). End air inlet (2
1) is the front of the casing (1) and the heat exchanger (1).
0), the air supply circuit (2) is formed in an independent duct shape in the casing (1), and is provided from the air supply port (21) to the heat exchanger. A horizontal path (2a) reaching a rear portion in the casing (1) through an upper region of (10); and a horizontal path (2a).
Descending path (2b) descending between the heat exchanger (10) and the rear wall of the casing (1) following the rear end of
From the lower end of the descending path (2b) to the air supply fan (F)
And a connecting cylinder (2c) reaching the suction port of the casing (1), and an exhaust pipe (3) connected to the heat exchanger (10) penetrates the horizontal path (2a).
A water heater having a configuration protruding from the upper surface of the water heater, wherein a wire mesh filter (4) is detachably attached to the air supply port (21).