JP3899056B2 - Water heater - Google Patents

Description

  The present invention relates to a water heater, and more specifically, it is possible to improve the heat exchange efficiency by securing a large amount of exhaust gas to be brought into contact with the inner wall surface of the smoke pipe, and the tendency of the baffle to rise due to the flow of exhaust gas. It is related with the water heater which can ease.

  2. Description of the Related Art Conventionally, there has been known a water heater in which a heat exchanger is disposed on an upper portion of a burner, and water supplied into the heat exchanger is exchanged with combustion heat of the burner to supply hot water from a hot water supply pipe. For example, as disclosed in Patent Document 1 (particularly, FIGS. 3 and 4), the water heater includes a burner, a can body provided on the upper portion of the burner, and a plurality of smoke pipes arranged in the can body. And a heat exchanger including a baffle that is housed in each smoke pipe and delays the passage time of exhaust gas in the smoke pipe. Here, the baffle is bent in a horizontal direction substantially orthogonal to the main body piece in a state of being connected to the main body piece in a state in which the baffle is continuous with the main body piece, and the bending direction is in the extending direction of the main body piece. It is comprised by the baffle plate set alternately along.

JP-A-2-219957

  However, the baffle disclosed in Patent Document 1 has a configuration in which the baffle plate is oriented substantially perpendicular to the main body piece, that is, in a direction substantially horizontally across the axial direction of the smoke pipe. Therefore, the exhaust gas in the smoke pipe becomes a flow that rises while zigzagging through the holes formed in the surface of the main body piece corresponding to the area of the baffle plate. Therefore, the exhaust gas that has passed through the hole is blocked by the baffle plate located immediately above and flows along the one side of the main body, and the amount of exhaust gas that comes into contact with the inner surface of the smoke tube is relatively reduced, and the smoke tube Inconvenience that heat exchange with surrounding water cannot be performed sufficiently.

  In addition, since the baffle plate is substantially horizontal, it tends to be strongly subjected to the pressure of the exhaust gas that rises in the smoke pipe, which makes it easy for the entire baffle to float upward in the axial direction of the smoke pipe. There is also the inconvenience of becoming.

  The present invention has been devised by paying attention to such inconveniences, and its purpose is to improve the heat exchange efficiency by contacting as much exhaust gas flowing in the smoke pipe as possible with the inner wall surface of the smoke pipe. It is to provide a water heater that can be used.

  Another object of the present invention is to provide a water heater in which the baffle is unlikely to lift upward in the axial direction of the smoke pipe due to the exhaust gas flowing in the smoke pipe accompanying combustion of the burner.

In order to achieve the above object, the present invention provides a water heater in which a heat exchanger is disposed in the vicinity of a burner.
The heat exchanger is accommodated in a can body, a smoke pipe disposed in the can body and forming a passage for exhaust gas accompanying combustion of the burner to exchange heat with water in the can body. And a baffle formed using a single metal plate ,
The baffle is bent in a direction substantially orthogonal to a zigzag extending surface of the main body piece along the axial direction of the smoke pipe, and the exhaust gas flowing in the smoke pipe is substantially spiraled. Equipped with a baffle plate that converts to a flow along the trajectory of
The width of the main body piece along the diameter of the smoke pipe is set to be substantially the same as the inner diameter of the smoke pipe,
Among the baffle plates, the baffle plate closest to the burner is provided in a substantially semi-elliptical shape, while the other baffle plates are provided in a shape obtained by cutting out a part of the substantially semi-ellipse,
Width along the minor axis of the ellipse in each of the baffle plate, Ru is set to substantially the same radius of the fire tube, and employs a configuration that.

Moreover, the present invention is a water heater in which a heat exchanger is disposed in the vicinity of the burner,
The heat exchanger is accommodated in a can body, a smoke pipe disposed in the can body and forming a passage for exhaust gas accompanying combustion of the burner to exchange heat with water in the can body. Baffles and
The baffle is configured to include a baffle plate having a shape that can mitigate lifting due to exhaust gas flowing in the smoke pipe.

  In the present invention, the baffle may be constituted by a main body piece extending zigzag along the smoke pipe and a baffle plate connected to the main body piece, and in that case, it is preferably formed using a single metal plate. .

  Moreover, it is preferable that the said baffle is set as the structure provided with the latching | locking part seated in the downstream opening end part of the said smoke pipe.

According to the present invention, since the exhaust gas flowing in the smoke pipe is provided so as to follow a substantially spiral in the presence of the baffle, the exhaust gas flows on the inner surface of the smoke pipe compared to the conventional exhaust gas flow. The exhaust gas passage time in the smoke pipe can be secured while securing a large amount of the exhaust gas along. Therefore, it is possible to efficiently perform heat exchange with water in the can.
In addition, since the exhaust gas has a substantially spiral flow, it is possible to make it difficult for the exhaust gas to receive a force that causes the baffle to float upward in the axial direction of the smoke pipe.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a schematic configuration diagram of a water heater in the present embodiment. In this figure, a water heater 10 includes a can body 11 having a substantially cylindrical outer shape and forming a water containing space therein, a combustion chamber 12 provided on the bottom side of the can body 11, and the combustion chamber. The burner 13 is disposed so as to form a flame from the side toward the side 12, and is disposed between the upper end of the combustion chamber 12 and the upper end of the can body 11, and the lower end opens into the combustion chamber 12. On the other hand, a plurality of smoke pipes 17 whose upper ends are opened to the side of the silencer 16 disposed above the can body 11 to form a passage for exhaust gas, and the can bodies 11 and The baffle 18 which comprises a heat exchanger with the smoke pipe 17 and the water supply and hot water supply connection port which are provided in the can 11 and which are not shown in figure are comprised.

The baffle 18 is formed using a single elongated metal piece. More specifically, as shown in FIG. 2 (A), the baffle 18 includes a main body piece 20 extending in the vertical direction within substantially the same vertical plane along a zigzag locus, and the main body piece 20. A baffle plate 21 is connected to each lower edge of the inclined region and is bent in a direction substantially orthogonal to the zigzag extending surface of the main body piece 20. The width of the main body piece 20 along the diameter of the smoke pipe 17 is set to be substantially the same as the inner diameter of the smoke pipe 17. Among the baffle plates 21, the baffle plate 21 closest to the burner 13 (the lowermost baffle plate 21 in FIG. 2B and the lowermost baffle plate 21 in FIG. 3A) is provided in a substantially semi-elliptical shape. On the other hand, the other baffle plate 21 is provided in a shape in which a part of a substantially semi-ellipse is cut out. The width along the short axis of the ellipse in the baffle plate 21 (the maximum width in the left-right direction in FIG. 3B) is set to be substantially the same as the radius of the smoke pipe 17 (see FIG. 4). As shown in FIG. 2 (B), the baffle plate 21 has a shape located in substantially the same plane as the main body piece 20 in a stage before the baffle 18 as a final shape is formed. A straight edge 21A along the inclined region of the piece 20, and a curved edge 21B extending along a substantially arc-shaped locus from the lower end of the straight edge 21A toward the outside, and a shape approximated to a wing shape in plan view; It has become. In the present embodiment, as shown in FIGS. 3A and 3B, each baffle plate 21 is set so that the bending directions are alternately opposite to each other in the vertical direction. When the baffle 18 is disposed in the exhaust gas, the exhaust gas directed from the lower side to the upper side of the smoke pipe 17 flows along a substantially spiral trajectory. Here, the baffle plate 21 in the present embodiment has an inclination angle of 15 degrees to 30 degrees with respect to the horizontal plane, and by setting the angle, the passage time of the exhaust gas flowing in the smoke pipe is ensured and sufficient heat exchange is performed. Can be done. In addition, the dashed-dotted line shown with the code | symbol 23 in FIG. 2 (B) shows the bending line of the baffle plate 21. FIG.

  The baffle 18 is provided with a locking portion 22 having a lower edge shape with a substantially L-shaped notch at the upper portion thereof. The locking portion 22 is seated in a state where it is hooked on the downstream opening end portion of the smoke pipe 17, that is, the upper end portion in FIG. 1, whereby the baffle 18 is positioned in the smoke pipe 17. Suspended and supported in a state.

  In the above configuration, the high-temperature exhaust gas generated by the combustion of the burner 13 passes through the smoke pipe 17 and is discharged to the outside through the silencer 16. When the exhaust gas passes through the smoke pipe 17, it passes along a substantially spiral trajectory due to the presence of the main body piece 20 provided in a zigzag and the baffle plate 21 that is integrated with the main body piece 20. Therefore, the exhaust gas does not flow in a straight line along the smoke pipe 17 but makes much contact with the inner wall surface of the smoke pipe 17 while ensuring a contact time with the inner wall surface of the smoke pipe 17. Heat exchange is performed efficiently. At this time, since the exhaust gas passes through the space where the baffle plate 21 does not exist so as to wrap around the locus of the spiral, the exhaust gas is not greatly applied to the lower surface side of the baffle plate 21.

  Therefore, according to such an embodiment, the exhaust gas can be passed so as to be in contact with the inner wall surface of the smoke pipe 17, and the heat exchange with the water around the smoke pipe can be performed efficiently. obtain. Moreover, since the exhaust gas does not strike the baffle plate 21 strongly, the tendency of the baffle 18 to lift can be reduced.

The best configuration, method and the like for carrying out the present invention have been disclosed in the above description, but the present invention is not limited to this.
That is, the invention has been illustrated and described with particular reference to particular embodiments, but it should be understood that the above-described embodiments are not deviated from the technical idea and scope of the invention. On the other hand, those skilled in the art can add various modifications.
Therefore, the configuration disclosed above is described as an example for facilitating the understanding of the present invention, and does not limit the present invention. Therefore, the baffle 18 ensures a certain heat exchange efficiency. However, various planar shapes can be employed as long as the lifting can be reduced.

  INDUSTRIAL APPLICABILITY The present invention can be mainly used as a water heater for a hot water supply system in a general household.

The schematic block diagram of the water heater based on this embodiment. (A) is the front view of the baffle in the said embodiment, (B) is the front view of the raw material in the step before forming a baffle. 2A is a right side view of FIG. 2A, and FIG. 3B is a plan view of FIG. The schematic perspective view of the said baffle.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Hot water heater, 11 ... Can body (heat exchanger), 13 ... Burner, 17 ... Smoke pipe (heat exchanger), 18 ... Baffle (heat exchanger), 20 ... Body piece, 21 ... Baffle plate, 22 ... Person Stop

Claims (1)

In a water heater in which a heat exchanger is arranged near the burner,
The heat exchanger is accommodated in a can body, a smoke pipe disposed in the can body and forming a passage for exhaust gas accompanying combustion of the burner to exchange heat with water in the can body. And a baffle formed using a single metal plate ,
The baffle is bent in a direction substantially orthogonal to a zigzag extending surface of the main body piece along the axial direction of the smoke pipe, and the exhaust gas flowing in the smoke pipe is substantially spiraled. Equipped with a baffle plate that converts to a flow along the trajectory of
The width of the main body piece along the diameter of the smoke pipe is set to be substantially the same as the inner diameter of the smoke pipe,
Among the baffle plates, the baffle plate closest to the burner is provided in a substantially semi-elliptical shape, while the other baffle plates are provided in a shape obtained by cutting out a part of the substantially semi-ellipse,
The water heater according to claim 1, wherein a width along the minor axis of the ellipse in each of the baffle plates is set to be substantially the same as a radius of the smoke pipe .

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