JP6893422B2 - Hot water heater - Google Patents

Description

The present invention relates to a hot water supply device that heats hot water for hot water supply by combustion exhaust of a burner.

Conventionally, a hot water supply device that heats hot water for hot water using a sensible heat exchanger and a latent heat exchanger is known (see, for example, Patent Document 1). The sensible heat exchanger is connected to the water supply pipe and absorbs the sensible heat from the combustion exhaust by the burner to heat the hot water supply water in the water supply pipe. The latent heat exchanger is arranged above the sensible heat exchanger, and the water supply pipe on the upstream side of the sensible heat exchanger is connected to recover the latent heat from the combustion exhaust that has passed through the sensible heat exchanger. Heats the hot water in the water supply pipe.

The combustion exhaust that has passed through the latent heat exchanger is discharged to the outside of the housing of the hot water supply device. At this time, the combustion exhaust passes through the latent heat exchanger and the speed of the exhaust flow decreases, so that the exhaust flow An exhaust port with a short path length is provided near the latent heat exchanger to shorten the flow distance of combustion exhaust from the latent heat exchanger to the downstream end of the exhaust port to improve exhaust efficiency. ing.

Further, since this type of exhaust port is provided so as to project from the front surface of the housing of the hot water supply device, the overall length of the exhaust port in the axial direction is short in order to form the outer shape of the hot water supply device compactly. It is formed.

This type of hot water supply device is installed, for example, on a balcony or aisle of an apartment. In this case, the combustion exhaust gas discharged from the downstream end of the exhaust port portion is discharged to the outside of the building across a balcony, a passage, or the like. At this time, if the flow velocity of the combustion exhaust discharged from the downstream end of the exhaust port is low, the combustion exhaust cannot cross the balcony, the passage, etc., and diffuses and stagnates around the exhaust port, and is discharged to the outside of the building. May not be performed smoothly.

Therefore, an opening forming member having a square opening is attached to the downstream end of the exhaust port, and the opening area at the downstream end of the exhaust port is reduced to suppress the spread of combustion exhaust and increase the flow velocity. An apparatus has been proposed (see Patent Document 2).

Japanese Unexamined Patent Publication No. 2008-309350 (Fig. 1) Japanese Unexamined Patent Publication No. 2011-179804

By the way, in this kind of hot water supply device, the exhaust flow is disturbed by the combustion exhaust passing through the heat exchanger. Such turbulence of the exhaust flow may become an exhaust noise and leak from the exhaust port portion, and the exhaust noise at this time may become a noise.

In the conventional one described above, the flow velocity of the combustion exhaust is increased by attaching an opening forming member to the downstream end of the exhaust port portion, but even if the opening forming member is provided, the exhaust noise is not reduced and noise is generated. There was an uncontrollable inconvenience.

In view of the above points, the present invention provides a hot water supply device that not only can perform high-speed exhaust gas that suppresses the spread of combustion exhaust gas discharged from the exhaust port portion, but also suppresses the generation of noise associated with the exhaust gas. With the goal.

In order to achieve such an object, the present invention provides a burner, a combustion chamber accommodating the burner, and hot water for hot water supply in the water supply channel by absorbing the heat of the combustion exhaust of the burner, which is arranged above the combustion chamber. A hot water supply device including a heat exchanger for heating and an exhaust port portion for discharging combustion exhaust gas that has passed through the heat exchanger. The exhaust port portion includes a cylindrical exhaust outlet portion and the heat exchanger. The heat exchanger is provided with an exhaust guide portion that guides the passed combustion exhaust to the upstream end of the exhaust outlet portion, and the heat exchanger extends longer than the diameter of the exhaust outlet portion with a width dimension shorter than the radius of the exhaust outlet portion. In the one provided with an elongated exhaust passing portion, a part of the exhaust passing portion faces the eccentric position of the exhaust leading portion in the exhaust leading portion, and inside the exhaust leading portion, the exhaust leading portion of the exhaust leading portion is provided. A single exhaust flow path forming member is provided, which forms an exhaust flow path extending along the axial direction on the eccentric position side facing the exhaust passage portion.

In the hot water supply device of the present invention, by providing an exhaust flow path forming member inside the exhaust lead-out portion provided in the exhaust port portion, the exhaust of combustion exhaust is guided along the exhaust flow path formed by the exhaust flow path forming member. .. At this time, a part of the exhaust passing portion of the heat exchanger is provided facing the eccentric position at the upstream end of the exhaust lead-out portion, and the exhaust flow path is formed on the eccentric position side.

As a result, the cross-sectional area of the exhaust flow path formed in the exhaust lead-out portion becomes relatively small, so that the flow velocity of the combustion exhaust gas passing through the exhaust flow path can be increased. Therefore, the spread of the combustion exhaust gas discharged from the exhaust port portion can be suppressed, and the stagnation of the combustion exhaust gas can be prevented.

In addition, although exhaust noise is generated when the exhaust passes through the heat exchanger, the flow path cross-sectional area of the exhaust flow path is relatively small, and due to the effect of the flow path shape that is continuous in the cross-sectional area, the exhaust flow path is concerned. The sound energy can be attenuated when the exhaust sound is exhausted, and the noise associated with the exhaust can be reduced.

Further, in the present invention, the exhaust flow path forming member includes a rectifying plate portion that divides the inside of the exhaust lead-out portion into two in the radial direction and uses one as the exhaust flow path, and a closed wall portion that closes the other. The exhaust flow path is preferably formed by the inner peripheral surface of the exhaust lead-out portion and the rectifying plate portion. As described above, since the exhaust flow path forming member is provided with the rectifying plate portion and the closed wall portion and has a simple structure, it is easy to manufacture and an increase in cost can be suppressed.

The front view of the hot water supply device of one Embodiment of this invention. The explanatory view which shows typically the structure of the hot water supply device of this embodiment. Explanatory sectional view of the exhaust port part in this embodiment. Explanatory drawing which shows the positional relationship and dimension of the exhaust lead-out part and the exhaust passage part in this embodiment. Explanatory perspective view which shows the exhaust flow path forming member in this embodiment.

An embodiment of the present invention will be described with reference to the drawings. As shown in FIG. 1, the hot water supply device 1 of the present embodiment is provided with an exhaust port 4 at an upper position of the front panel 3 of the main body case 2. It is attached to the aisle and installed outdoors.

As shown in FIG. 2, the heat source machine 5 for hot water supply is housed inside the main body case 2. The hot water supply heat source machine 5 includes a combustion casing 7 (combustion chamber) in which a burner 6 is built. Combustion air is supplied to the combustion casing 7 from below by the combustion fan 8. A sensible heat exchanger 9 that recovers the sensible heat in the combustion exhaust of the burner 6 is arranged in the upper part of the combustion casing 7.

The sensible heat exchanger 9 includes a large number of endothermic fins 10 and a plurality of endothermic tubes 11 penetrating the endothermic fins 10. Then, these heat absorbing pipes 11 are connected in series to form a series of heat exchange water channels (water supply channels), and the hot water supply water flowing through the heat exchange water channels absorbs the sensible heat in the combustion exhaust and is heated. ing.

Above the combustion casing 7, an exhaust casing 13 is provided in which the combustion exhaust gas that has passed through the sensible heat exchanger 9 flows in through a communication portion 12 provided at the rear of the upper surface of the combustion casing 7. A latent heat exchanger 14 that recovers the latent heat in the combustion exhaust gas is arranged in the exhaust housing 13.

The latent heat exchanger 14 includes a plurality of endothermic pipes 15 horizontally provided in the exhaust housing 13. Then, unheated hot water for hot water supply is passed through these heat absorbing pipes 15 so that the water vapor in the combustion exhaust is condensed on the outer surface of the heat absorbing pipe 15. As a result, the hot water supply water flowing through the latent heat exchanger 14 absorbs the latent heat and is heated. The hot water supply water heated by the latent heat exchanger 14 is sent to the sensible heat exchanger 9.

An exhaust passage portion 16 that opens laterally and horizontally at a position facing the side surface of the latent heat exchanger 14 is formed on the front side surface of the exhaust housing 13, and an exhaust port portion 4 is integrally attached to the exhaust passage portion 16. Has been done.

As a result, the combustion exhaust that has passed through the latent heat exchanger 14 is directed to the exhaust passing portion 16, and the combustion exhaust that has passed through the exhaust passing portion 16 is discharged to the outside of the machine through the exhaust port portion 4. The combustion exhaust generated during the hot water supply operation is forcibly flowed by the combustion fan 8 and directed to the exhaust passing portion 16.

As shown in FIGS. 1 and 3, the exhaust port portion 4 has a cylindrical exhaust lead-out portion 17, a bird net 18 fitted at the downstream end of the exhaust lead-out portion 17, and a support for supporting the exhaust lead-out portion 17. It has a part 19. The bird net 18 prevents birds from entering the inside of the exhaust lead-out unit 17.

The support portion 19 faces the exhaust passage portion 16 except for a portion connecting the upstream ends of the exhaust lead-out portion 17. As a result, the support portion 19 has a function of guiding the combustion exhaust from the exhaust passing portion 16 to the upstream end of the exhaust lead-out portion 17, and corresponds to the exhaust guide portion of the present invention.

Further, as shown in FIG. 3, in the support portion 19, the downstream end of the exhaust lead-out portion 17 faces upward with a slight angle (the axis x gradually inclines in the upward direction from the upstream side to the downstream side). It supports the exhaust lead-out unit 17. The angle θ of the axis x of the exhaust lead-out unit 17 with respect to the horizontal is set to about 1 ° to 3 °.

Here, the size of the exhaust passing portion 16 and the exhaust leading portion 17 and their positional relationship with each other will be described. As shown in FIG. 4, the exhaust passing portion 16 is formed in an elongated shape having a width dimension W shorter than the radius dimension R1 of the exhaust lead-out portion 17 and a longitudinal dimension L longer than the diameter dimension R2 of the exhaust lead-out portion 17. ing.

The upstream end of the exhaust lead-out portion 17 faces a part of the exhaust passage portion 16. The exhaust passage portion 16 is eccentric upward with respect to the axis x of the exhaust lead-out portion 17.

As shown in FIGS. 2 and 3, the upstream end of the exhaust lead-out portion 17 faces the latent heat exchanger 14 via the exhaust passage portion 16. An exhaust flow path forming member 20 is provided inside the exhaust lead-out unit 17.

As shown in FIG. 5, the exhaust flow path forming member 20 is connected to a rectifying plate portion 21 having a flat upper surface as a rectifying surface, and an upstream end edge and a downstream end edge of the rectifying plate portion 21, respectively. The support portion 19 is provided with a pair of closed wall portions 22 and 23 provided, and is provided via a flange portion 24 protruding from the side edge of the closed wall portion 22 connected to the upstream end edge of the straightening vane portion 21. It is fixed to the inner surface of.

As shown in FIG. 3, the rectifying plate portion 21 is provided at a position corresponding to the lower edge of the exhaust passing portion 16, and is the inner circumference of the exhaust leading portion 17 that covers the rectifying plate portion 21 and the upper part of the rectifying plate portion 21. An exhaust flow path 25 is formed with the surface.

Since the rectifying plate portion 21 of the exhaust flow path forming member 20 is provided at a position corresponding to the lower edge of the exhaust passage portion 16, the exhaust flow path 25 is also eccentric so as to be upward with respect to the axis x of the exhaust lead-out portion 17. It is provided at the position.

The upstream end edge of the rectifying plate portion 21 and the lower edge of the exhaust passing portion 16 may be at the same height position as in the present embodiment, but the lower edge of the exhaust passing portion 16 is the rectifying plate portion. It may be located above the upstream edge of 21. As a result, the exhaust gas that has passed through the exhaust gas passage portion 16 does not collide with the closed wall portion 22, and the exhaust gas can flow smoothly.

The lower part of the straightening vane portion 21 including the position of the axis x of the exhaust lead-out portion 17 is closed by the closing wall portions 22 and 23. Further, since the closing wall portions 22 and 23 support both ends of the straightening vane 21 in pairs to firmly maintain the posture of the straightening vane 21, vibration of the straightening vane 21 can be reliably prevented. it can. If the strong mounting state of the straightening vane portion 21 can be maintained, only one of the closing wall portions 22 and 23 may be provided.

Then, the exhaust flow path 25 sets the distance between the upper surface position of the rectifying plate portion 21 and the maximum height position of the exhaust lead-out portion 17 covering the upper part of the rectifying plate portion 21 as h, and the direction along the axis x of the exhaust flow path 25. When the distance (flow path length) of is d, it is formed so as to satisfy the relationship of h <d.

In the hot water supply device 1 of the present embodiment having the above configuration, the exhaust of combustion exhaust is guided along the exhaust flow path 25 formed by the exhaust flow path forming member 20 provided inside the exhaust lead-out unit 17.

At this time, since the exhaust passage portion 16 and the exhaust flow path 25 are eccentric with respect to the axis x of the exhaust lead-out portion 17, the flow path cross-sectional area of the exhaust flow path 25 becomes relatively small and passes through the exhaust flow path. The flow velocity of the combustion exhaust becomes high and the spread of the combustion exhaust is suppressed.

Further, since the shape of the exhaust flow path 25 satisfies the relationship of h <d, the flow path length d of the exhaust flow path 25 is sufficiently secured, and the combustion exhaust passing through the exhaust flow path 25 is reliably rectified. Therefore, straightness can be imparted without increasing the exhaust resistance. By reducing the exhaust resistance, not only the rotation speed of the combustion fan 8 (see FIG. 2) can be reduced to reduce the exhaust noise, but also the power consumption of the combustion fan 8 can be suppressed.

Moreover, in the present embodiment, since the exhaust lead-out unit 17 is provided in a posture in which the downstream end is inclined upward, the exhaust lead-out unit 17 utilizes the ascending flow due to the temperature (higher than the outside air) of the combustion exhaust itself. Smooth guidance can be promoted, which also increases the flow velocity of the combustion exhaust.

As described above, it is possible to prevent the combustion exhaust from stagnation downstream of the exhaust lead-out unit 17. Therefore, when the hot water supply device 1 is installed on the balcony or passage of the condominium, the combustion exhaust surely crosses the balcony or passage. Then, the combustion exhaust gas is smoothly discharged to the outside of the building.

Further, since the flow path cross-sectional area of the exhaust flow path 25 is relatively small, the opening area at the downstream end of the exhaust lead-out portion 17 is also small, so that the sound energy outward from the exhaust lead-out portion 17 can be attenuated. As a result, it is possible to suppress the generation of noise associated with exhaust gas.

Further, since the exhaust flow path forming member 20 provided for forming the exhaust flow path 25 only needs to be provided under the exhaust flow path 25 of the exhaust lead-out portion 17, only one is provided as in the present embodiment. Since the structure is simple, it is easy to manufacture and the cost increase can be suppressed.

In the present embodiment, the exhaust passage portion 16 and the exhaust flow path 25 are eccentric upward with respect to the axis x of the exhaust lead-out portion 17, but the eccentric direction is not limited to this. It is set according to the shape (longitudinal direction) of 16. For example, although not shown, a configuration in which the exhaust passage portion 16 and the exhaust flow path 25 are eccentric downward with respect to the axis x of the exhaust lead-out portion 17 can be adopted, and the same effect as that of the present embodiment can be obtained. Can be done.

1 ... hot water supply device, 4 ... exhaust port, 6 ... burner, 7 ... combustion chamber (combustion chamber), 14 ... latent heat exchanger (heat exchanger), 16 ... exhaust passage, 17 ... exhaust lead out, 19 ... Support part (exhaust guide part), 20 ... exhaust flow path forming member, 21 ... rectifying plate part, 22, 23 ... closed wall part, 25 ... exhaust flow path.

Claims (2)

A burner, a combustion chamber that houses the burner, a heat exchanger that is arranged above the combustion chamber and absorbs heat from the combustion exhaust of the burner to heat hot water for hot water supply in the water supply channel, and the heat exchanger. A hot water supply device provided with an exhaust port for discharging the passed combustion exhaust.
The exhaust port portion includes a cylindrical exhaust lead-out portion and an exhaust guide portion that guides combustion exhaust that has passed through the heat exchanger to the upstream end of the exhaust lead-out portion, and the heat exchanger includes the exhaust lead-out portion. In those provided with an elongated exhaust passage portion having a width dimension shorter than the radius of the portion and extending longer than the diameter of the exhaust lead-out portion.
In the exhaust lead-out portion, a part of the exhaust passage portion faces the eccentric position of the exhaust lead-out portion.
Inside the exhaust lead-out portion, a single exhaust flow path forming member is provided, which forms an exhaust flow path extending along the axial direction of the exhaust lead-out portion on the eccentric position side facing the exhaust passage portion. A hot water supply device characterized by being The exhaust flow path forming member includes a rectifying plate portion that divides the inside of the exhaust lead-out portion into two in the radial direction and uses one as the exhaust flow path, and a closed wall portion that closes the other.
The hot water supply device according to claim 1, wherein the exhaust flow path is formed by an inner peripheral surface of the exhaust lead-out portion and the rectifying plate portion.

Images