JP2011144981A - Water heater - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water heater which includes a primary heat exchange means and a secondary heat exchange means and minimizes the number of components, and in which a bottom plate of a casing of the secondary heat exchange means is slantly arranged. <P>SOLUTION: The water heater 10 includes: the primary heat exchange means 12 heating water by combustion gas from a burner 11 arranged at the lower side; and the secondary heat exchange means 13 taking in combustion gas made to pass through the primary heat exchange means 12 and preheating water. The primary heat exchange means 12 having heating piping 33 arranged therein includes: a cylindrical wall 19 having a rectangular shape in a plane view and including a gas send-out port 30 formed at the upper part to be inclined to one direction; and a flange plate 20 formed to continue to the upper part of the cylindrical wall 19 and arranged around the gas send-out port 30. The bottom plate 42 fixed to the flange plate 20, arranged in the inclined state and having a combustion gas introduction port 44 arranged above the uppermost part of the gas send-out port 30 is provided in the casing 36 of the secondary heat exchange means 13 including preheating piping 37 arranged inside. A drain discharge port 49 is formed in the lowest part of the inclined bottom plate 42. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention comprises primary heat exchange means for heating water using combustion gas generated by combustion of a burner as a heat source, and secondary heat exchange means for heating water by the heat of combustion gas that has passed through the primary heat exchange means. The present invention relates to a water heater that heats water using combustion gas.

2. Description of the Related Art Conventionally, some water heaters that efficiently recover the heat of combustion gas and heat water include a primary heat exchange means and a secondary heat exchange means. The primary heat exchange means is arranged at the upper part of the burner that generates the combustion gas, takes in the combustion gas from the lower part, heats the water flowing in the heating pipe, and supplies the combustion gas to the secondary heat exchange means arranged at the upper part. send. The secondary heat exchange means includes a preheating pipe disposed in the upstream side of the heating pipe in the housing, and heats water flowing through the preheating pipe using heat of combustion gas.

When water is heated, water droplets are generated on the surface of the preheating pipe. For example, as disclosed in Patent Document 1, the bottom plate of the casing of the secondary heat exchange means is provided with a drain outlet. The drain is formed so that the drain flows smoothly into the drain outlet. In order to incline the bottom plate, a connecting member is provided between the primary heat exchange means and the secondary heat exchange means, which has an inclined surface on which the bottom plate of the secondary heat exchange means is closely arranged.

Japanese Patent No. 4264825

However, in addition to providing the connection member, the water heater requires a fixing bracket (for example, a screw) for fixing the connection member to the primary heat exchange means and the secondary heat exchange means, and the members constituting the water heater, The number of parts increases. Further, there has been a problem that the time required for manufacturing the water heater becomes longer due to the positioning of the connecting member and the attachment work with the fixing metal fittings for each of the primary heat exchange means and the secondary heat exchange means.
The present invention has been made in view of such circumstances, and an object thereof is to provide a water heater in which the bottom plate of the casing of the secondary heat exchange means is inclined without using a connection member.

A hot water supply apparatus according to the present invention that meets the above-described object includes a primary heat exchange means that heats water using a combustion gas from a burner disposed at a lower portion as a heat source, and the combustion gas that has passed through the primary heat exchange means. A water heater having a secondary heat exchange means for preheating the water, wherein the primary heat exchange means having a heating pipe inside is formed with a gas delivery port inclined in one direction at an upper portion thereof, A rectangular cylindrical wall portion, and a saddle plate portion formed continuously around the upper portion of the cylindrical wall portion and disposed around the gas outlet, which is inclined, and has a preheating pipe inside. The casing of the secondary heat exchanging means provided has a bottom plate fixed to the saddle plate portion and arranged in an inclined state and having an inlet for the combustion gas above the uppermost portion of the gas outlet. A drain outlet is provided at the bottom of the bottom plate provided in an inclined state. It is.

In the water heater according to the present invention, it is preferable that the saddle plate portion is formed by bending an upper end portion of the cylindrical wall portion outward.

In the water heater according to the present invention, it is preferable that a reinforcing member for supporting the saddle plate portion is provided at a lower portion of the saddle plate portion.

The hot water supply apparatus according to any one of claims 1 to 3, wherein the primary heat exchanging means is formed continuously at the upper part of the cylindrical wall part, and has a girdle part disposed around the gas delivery port that is inclined, Since the casing of the secondary heat exchange means is provided with a bottom plate that is fixed to the saddle plate and is inclined, it is necessary to use a connection member or the like for inclining the bottom of the secondary heat exchange means. In addition, the number of parts of the entire water heater can be reduced. Moreover, since it is not necessary to attach a connecting member or the like between the primary heat exchange means and the secondary heat exchange means, it is possible to shorten the manufacturing time of the water heater and increase the productivity.

In particular, in the water heater according to claim 2, the saddle plate portion is formed by bending the upper end portion of the cylindrical wall portion outward, so that the saddle plate portion for fixing the bottom plate of the secondary heat exchange means is bent. Can be easily formed.

In the water heater according to the third aspect, since a reinforcing member for supporting the saddle plate portion is provided at the lower portion of the saddle plate portion, when attaching the secondary heat exchange means to the saddle plate portion, etc. It is possible to prevent deformation or the like in the plate portion.

1 is a partially omitted cross-sectional view of a water heater according to an embodiment of the present invention. It is a side view of the water heater. It is a perspective view of the primary heat exchange means of the water heater. It is a bottom view of the secondary heat exchange means of the water heater.

Next, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention.
As shown in FIGS. 1 and 2, a water heater 10 according to an embodiment of the present invention includes primary heat exchange means 12 that heats water using a combustion gas from a burner 11 disposed in a lower part as a heat source, It is a device that takes in the combustion gas that has passed through the primary heat exchange means 12 and has secondary heat exchange means 13 that preheats water, and produces hot water to be supplied to a bathtub, faucet or the like. Hereinafter, these will be described in detail.

The burner 11 is disposed in a bottomed casing 14 having an open top, and a gas pipe 15 that supplies gas to the burner 11 is connected to the burner 11. A ventilation hole 16 is provided in the center of the bottom of the casing 14, and is necessary for combustion of the burner 11 in the casing 14 from the fan 17 disposed at the lower part of the casing 14 through the ventilation hole 16. Air is sent.

As shown in FIGS. 1 to 3, the primary heat exchanging means 12 is made of a copper cylindrical wall portion 19 that is vertically arranged, and copper portions that are continuously formed on the upper and lower portions of the cylindrical wall portion 19. The slats 20 and 21 are provided.
The cylindrical wall portion 19 is configured by rectangular side plates 22 and 23 that are arranged to face each other and have different heights, and side plates 24 and 25 that are arranged orthogonal to the side plates 22 and 23. Both side edges of the side plate 24 are connected to one side edge of the side plates 22 and 23, respectively, and both sides of the side edge of the side plate 25 are connected to side edges of the other side of the side plates 22 and 23, respectively. The cylindrical wall portion 19 is formed in a rectangular shape in plan view. The side plate 22 is formed higher than the side plate 23, and the upper ends of the side plates 24 and 25 are inclined downward from the side plate 22 toward the side plate 23.

The gutter part 20 is formed by bending the upper end part of the cylindrical wall part 19 having a rectangular cross section outward. The frame plate portion 20 is provided with rectangular frame plates 26, 27, 28, and 29 connected to the upper ends of the side plates 22, 23, 24, and 25, respectively. The bottom of the secondary heat exchange means 13 is attached.
And since the upper surface of the saddle plate part 20 is inclined according to the inclination of the upper end part of the cylindrical wall part 19, it supports the bottom part of the secondary heat exchange means 13 in the inclined state.

The gutter plate 21 is formed by bending a lower end portion of a cylindrical tubular wall portion 19 having a rectangular cross section outward at a right angle, and is disposed horizontally and fixed to the upper portion of the housing 14. And since the upper part of the housing | casing 14 becomes an opening and is connected with the inside of the cylindrical wall part 19, the combustion gas generated by the combustion of the burner 11 is taken in in the cylindrical wall part 19 from the opening.
Further, a gas delivery port 30 is formed inside the upper end portion of the cylindrical wall portion 19, that is, inside the wall plate portion 20, and the combustion gas in the cylindrical wall portion 19 is sent out from the gas delivery port 30. The gas outlet 30 is inclined downward in the direction from the frame plate 26 to the frame plate 27.

In the primary heat exchanging means 12, a frame body part 31 fixed to the lower part of the gutter plate part 20, a frame body part 31 a fixed to the upper part of the gutter board part 21, and the outer side part of the side plate 22 are closely arranged. A reinforcing member 32 having a vertical plate portion 31b is provided. The reinforcing member 32 supports the flange plate portion 20 from below by the frame body portion 31 and supports the flange plate portion 21 from above by the frame body portion 31a to prevent the flange plate portions 20, 21 from being deformed. ing. The frame body 31 is formed with a vertical portion 32a that is arranged in parallel to the vertical plate portion 31b and that positions the secondary heat exchange means 13 and the frame plates 26, 27, 28, and 29.
A plurality of linear heating pipes 33 through which hot water flows are arranged in parallel inside the cylindrical wall portion 19, and each heating pipe 33 is connected by a connecting pipe 34 arranged outside the side plates 24, 25. Yes. The connecting pipe 34 forms a U-shaped flow path, and each heating pipe 33 is fixed so that the heating pipe 33 is parallel to the other heating pipes 33.
A plurality of copper fin plates 35 arranged in the vertical direction are arranged inside the cylindrical wall portion 19. The fin plate 35 includes a plurality of through holes through which the heating pipe 33 is inserted, and conducts heat absorbed from the combustion gas to the heating pipe 33 so as to efficiently heat the water in the heating pipe 33.

As shown in FIGS. 1, 2, and 4, the secondary heat exchange means 13 includes a box-shaped housing 36, and a plurality of preheating pipes 37 having different height arrangements are provided inside the housing 36. It has been. The preheating pipe 37 is formed by meandering a stainless steel pipe, and heats the combustion gas in the housing 36 to water flowing inside to heat the water. The preheating pipe 37 is formed to include a straight portion 37a arranged in parallel and a folded portion 37b connecting the straight portions 37a, and the folded portion 37b forms a U-shaped flow path.
In addition, a water supply pipe 38 that supplies water to each preheating pipe 37 and a connection pipe 39 that supplies water (hot water) that has passed through each preheating pipe 37 to the heating pipe 33 are provided on one side surface of the housing 36. Therefore, the water supplied from the water supply pipe 38 is preheated through the preheating pipe 37 and then sent to the heating pipe 33 through the connection pipe 39 to be heated to become hot water for hot water supply.

Between the water inlet of the preheating pipe 37 and the water supply pipe 38, a water storage unit 40 that distributes the water supplied through the water supply pipe 38 to each preheating pipe 37 is disposed. Between the outlet and the connection pipe 39, a water storage section 40a that collects water discharged from each preheating pipe 37 and sends it to the connection pipe 39 is provided. Thereby, the water sent from the water supply pipe 38 passes through the water storage section 40 and is sent to each preheating pipe 37, and the water discharged from each preheating pipe 37 passes through the water storage section 40 a and is sent to the connection pipe 39. . In the bottom view of FIG. 4, the left and right are drawn in reverse.

The casing 36 is provided with a bottom plate 42 fixed to the gutter plate portion 20 via a heat-resistant sealing material 41, and the bottom plate 42 is disposed in an inclined manner. The bottom plate 42 is provided with a dent region 43 formed in the upper region of the gas outlet 30 of the primary heat exchange means 12 in a state of being fixed to the gutter plate portion 20, and is formed in a plan view. And it has a rectangular bottom, and the bottom is inclined.
The bottom plate 42 is formed with a rectangular inlet 44 that is disposed above the uppermost portion of the inclined gas outlet 30 and into which combustion gas flows. The introduction port 44 is formed at the uppermost portion of the bottom portion of the depression region 43 that is inclined, so that the combustion gas that exits from the gas delivery port 30 is guided to the bottom portion of the depression region 43 and enters the introduction port 44. Sent.

In the housing 36, vertically arranged partition plates 45, 46, 47 for vertically guiding the combustion gas that has entered the housing 36 from the introduction port 44 are provided, and each preheating pipe 37 efficiently burns the combustion gas. To absorb the heat. The partition plate 45 is provided in the upper half of the housing 36 and guides the combustion gas downward. The partition plate 46 covers the lower half and the upper half is open, so the combustion gas is guided upward. To do. Since the partition plate 47 is arranged so as to cover the upper side of the housing 36 and open the lower portion, the partition plate 47 guides the combustion gas downward and exhausts the gas formed on one side surface of the housing 36. The combustion gas is discharged from the housing 36 through the outlet 48.

In addition, a circular drain discharge port 49 is formed in the bottom plate 42 on the opposite side of the region where the gas introduction port 44 is formed. The drain outlet 49 is provided to discharge water drops generated on the surface of the preheating pipe 37 and falling on the bottom plate 42, and is disposed at the lowest position of the inclined bottom plate 42.
The bottom plate 42 is fixed and tilted to the gutter plate portion 20 of the primary heat exchange means 12, and a member for tilting the bottom plate 42 is provided between the primary heat exchange means 12 and the secondary heat exchange means 13. Since it is not performed, the number of members and parts constituting the water heater 10 can be reduced. Moreover, it is not necessary to attach a member for inclining the bottom plate 42 between the primary heat exchange means 12 and the secondary heat exchange means 13, and the time required for manufacturing the water heater 10 can be shortened, and the productivity can be increased. is there.
The inclination angle of the bottom plate 42 is 3 degrees to 20 degrees. This is because when the tilt angle is less than 3 degrees, water drops do not flow smoothly toward the drain outlet 49, and when the angle exceeds 20 degrees, the amount of copper material for forming the cylindrical wall portion 19 This is because the manufacturing cost of the primary heat exchange means 12 increases.

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and all changes in conditions and the like that do not depart from the gist are within the scope of the present invention.
For example, the vertical plate portion of the reinforcing member may be formed so as to cover the entire outside of the cylindrical wall portion. Further, without providing the primary heat exchanging means and the burner casing separately, the cylindrical wall portion of the primary heat exchanging means and the burner casing can be integrated into one casing.

10: Hot water heater, 11: Burner, 12: Primary heat exchange means, 13: Secondary heat exchange means, 14: Housing, 15: Gas pipe, 16: Ventilation hole, 17: Fan, 19: Cylindrical wall, 20, 21: slat plate part, 22, 23, 24, 25: side plate, 26, 27, 28, 29: frame plate, 30: gas delivery port, 31, 31a: frame body part, 31b: vertical plate part, 32 : Reinforcing member, 32a: vertical part, 33: heating pipe, 34: connecting pipe, 35: fin plate, 36: housing, 37: preheating pipe, 37a: straight part, 37b: folded part, 38: water supply pipe, 39 : Connection pipe, 40, 40a: Water storage part, 41: Heat-resistant sealing material, 42: Bottom plate, 43: Recessed area, 44: Inlet, 45, 46, 47: Partition plate, 48: Gas outlet, 49: Drain Vent

Claims (3)

Primary heat exchange means for heating water using combustion gas from a burner disposed at the lower part as a heat source, and secondary heat exchange means for taking in the combustion gas that has passed through the primary heat exchange means and preheating the water A water heater having
The primary heat exchanging means having a heating pipe inside is formed with a gas delivery port inclined in one direction at the upper part, continuously in a rectangular cylindrical wall part in plan view, and the upper part of the cylindrical wall part. Formed and obliquely disposed around the gas delivery port,
Introducing the combustion gas above the uppermost portion of the gas delivery port, fixed to the saddle plate, is arranged in an inclined state in the casing of the secondary heat exchange means provided with preheating piping inside A water heater, wherein a bottom plate having a mouth is provided, and a drain discharge port is provided at a lowermost portion of the bottom plate arranged in an inclined state. 2. The water heater according to claim 1, wherein the rib plate portion is formed by bending an upper end portion of the cylindrical wall portion outward. The water heater according to claim 1 or 2, wherein a reinforcing member that supports the saddle plate portion is provided at a lower portion of the saddle plate portion.

Images