JP2008032276A - Combined heat source unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent imbalance in exhausting even if a hot water supply-side latent-heat heat exchanger is disposed, in a combined heat source unit comprising a hot water supply-side heating passage 12 provided with a hot water supply burner 61 and a first sensible-heat heat exchanger 62, and a second heating passage 13 provided with a second burner 21 and a second sensible-heat heat exchanger 22 in such a state that both heating passages 12, 13 are formed in a common can body 3 in parallel with each other, and further provided with a fan 41 for supplying combustion air to the hot water supply burner 61 and the second burner 21. <P>SOLUTION: A hot water supply-side exhaust passage 43 and a second exhaust passage 48 extending from downstream ends of the hot water supply-side heating passage 12 and the second heating passage 13, respectively, are formed in parallel with each other in a second can body 30 connected with the can body 3, the latent-heat heat exchanger 60 is disposed in the hot water supply-side exhaust passage 43, and an exhaust resistor body 47 for properly setting an exhaust flow rate in the second heating passage 13 is disposed in the second exhaust passage 43. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention comprises a heat exchanger such as a bath that returns to the bathtub or floor heating mat after reheating relatively warm water returning from the bathtub or floor heating mat, and a heat exchanger for hot water supply. The present invention relates to a composite heat source device.

As this type of composite heat source device, one having the configuration shown in FIG. 7 is known (Patent Document 1).
The inside of the can (3) is divided into a hot water supply side heating passage (12) and a memorial side heating passage (13) by a partition wall (11) in the lateral direction, and each of these heating passages (12) (13) A combustion exhaust gas from a gas burner described later flows through. An air supply / exhaust fan (4) is disposed at the downstream junction of the hot water supply side heating passage (12) and the tracking side heating passage (13), and the downstream side is connected to an exhaust port from the exhaust duct (51). Connected to (52).

In the hot water supply side heating passage (12), a hot water supply burner (61) and a hot water supply heat exchanger (62) are arranged in this order from the upstream side, and in the other additional heating side heating passage (13). The bath reheating burner (21) and the reheating heat exchanger (22) are arranged in this order from the upstream side. In addition, a circulation pump (24) is disposed in a tracking circuit (23) that circulates through the heat exchanger for remedy (22) and the bathtub (20).
In this case, when the fan (4) is operated to burn the remedy burner (21) and the circulation pump (24) is operated, the bathing water in the bathtub (20) enters the remedy circuit (23). It circulates and is heated by the heat exchanger for remedy (22), so that the bath can be remedied.

On the other hand, when the hot water supply burner (61) is burned, the water in the hot water supply heat exchanger (62) is heated and supplied to the hot water supply circuit (63).
Also, during combustion of the remedy burner (21) and hot water supply burner (61), the combustion exhaust flowing through the remedy side heating passage (13) and hot water supply side heating passage (12) is sucked by the fan (4). It is discharged from the exhaust duct (51) through the exhaust port (52).

In this case, combustion exhaust is discharged using a common fan (4) disposed downstream of the hot water supply side heating passage (12) and the additional heating side heating passage (13). ) And the tracking side heating passage (13), it is not necessary to separately provide fans, and there is an advantage that the number of parts can be reduced. In addition, since the hot water supply heat exchanger (62) and the memorial heat exchanger (22) are accommodated in a single can body (3), the number of parts can be reduced in that the can body (3) can be shared. There is an advantage of reducing.
Japanese Utility Model Publication No. 4-50313 Japanese Patent Laying-Open No. 2004-271109 (FIG. 1)

  On the other hand, in recent years, from the viewpoint of effective use of resources, there is an increasing demand for improvement in thermal efficiency in heat source devices such as gas appliances. In order to meet such a demand, a water heater is a condensing type in which a latent heat exchanger is disposed in the exhaust passage downstream of a heat exchanger (sensible heat exchanger) that recovers sensible heat from the combustion exhaust of a gas burner. Various types have been developed (Patent Document 2). Here, the latent heat exchanger is one that condenses water vapor in the combustion exhaust by cooling the combustion exhaust that has passed through the sensible heat exchanger to a dew point or less, and thereby recovers latent heat from the combustion exhaust. Thus, the thermal efficiency can be improved by the latent heat recovery.

  On the other hand, the return hot water in the bath reheating circuit is relatively warm, so that the combustion exhaust from the reheating burner (21) does not fall below the return hot water temperature. Even if the latent heat exchanger is provided, the combustion exhaust Since it is difficult to cool below the dew point, a significant improvement in thermal efficiency cannot be expected. In addition, the number of components increases due to the arrangement of the latent heat exchanger, and the structure becomes complicated.

  In consideration of the above points, a hot water supply side heating passage (12) is used in a combined heat source device including a heat exchanger for reheating (22) and a heat exchanger for hot water supply (62) like the conventional one shown in FIG. If the latent heat exchanger is provided only at the top, it is possible to meet both demands for improvement in thermal efficiency and prevention of structural complexity.

However, in the case of FIG. 7, if a latent heat exchanger is provided only in the hot water supply side heating passage (12), the exhaust resistance of the hot water supply side heating passage (12) increases, and therefore the hot water supply side heating passage (12). As a result, the balance of the exhaust resistance of the heating side heating passage (13) is lost and proper combustion of the hot water supply burner (61) and the additional heating burner (21) is hindered.
In the case where a heating heat exchanger for reheating relatively warm return water is incorporated instead of the reheating heat exchanger (22) in the same manner as in the reheating of the bath, there is a problem similar to the above.

The present invention has been made in view of the above points.
A hot water supply side heating passage provided with a hot water supply burner (61) and a first sensible heat exchanger for recovering sensible heat of combustion exhaust from the hot water supply burner (61);
A second heating passage provided with a second burner different from the hot water supply burner (61) and a second sensible heat exchanger for recovering sensible heat of the combustion exhaust from the second burner. ,
The hot water supply side heating passage and the second heating passage are formed in parallel in a common can body (3), and
In the composite heat source device provided with a single fan for supplying combustion air to the hot water supply burner (61) and the second burner,
Even when the latent heat exchanger corresponding to the hot water supply side heating passage is provided, the balance of the exhaust resistance between the hot water supply side heating passage and the second heating passage is prevented from being lost. An object is to ensure proper combustion of the second burner.

[Invention of Claim 1]
The solution means of the invention according to claim 1 for solving the above-mentioned problem is as follows:
“The hot water supply side exhaust passage extending from the downstream end of the hot water supply side heating passage and the second exhaust passage extending from the downstream end of the second heating passage are a second can connected to the can body (3). Formed in parallel in the body,
The hot water supply side exhaust passage is provided with a latent heat exchanger that recovers latent heat of the combustion exhaust,
The second exhaust passage is provided with an exhaust resistor for appropriately setting the exhaust flow velocity of the second heating passage.
In this, cold water such as clean water is supplied to the latent heat exchanger provided in the hot water supply side exhaust passage extending from the downstream end of the hot water supply side heating passage, and the second sensible heat provided in the second heating passage. The exchanger is used by piping so that relatively warm water returning from a bathtub, floor heating mat or the like flows in. Cold water such as clean water is primarily heated when passing through the latent heat exchanger provided in the hot water supply side exhaust passage, and then secondary when passing through the first sensible heat exchanger that follows. It is heated and heated up to the tapping temperature. On the other hand, the relatively warm water flows into the second sensible heat exchanger disposed on the second heating passage side, and the temperature is raised.

  In the invention according to claim 1, the hot water supply side exhaust passage extending from the downstream end of the hot water supply side heating passage and the second exhaust passage extending from the downstream end of the second heating passage are connected to the can body (3). Are formed in parallel in the second can. And the thermal efficiency on the hot water supply side is improved by the latent heat exchanger disposed in the hot water supply side exhaust passage.

  In the invention according to claim 1, the exhaust gas flow velocity in the second heating passage is set appropriately by the exhaust resistor disposed in the second exhaust passage. Therefore, even if a latent heat exchanger of the hot water supply side exhaust passage is provided in the second can body connected to the can body (3), the exhaust balance of the hot water supply side heating passage and the second heating passage is not disturbed. Smooth combustion of the hot water supply burner (61) and the second burner can be ensured.

  In addition, since a composite heat source device can be manufactured simply by disposing a latent heat exchanger and an exhaust resistor in the second can body connected to the can body (3), the hot water supply side exhaust and the second exhaust passage ( Compared with the case where 44) is formed in separate cans, the structure can be simplified.

[Invention of Claim 2]
In the invention according to claim 1,
In the case of “the exhaust resistor is a plate body to which the combustion exhaust gas flowing through the exhaust resistor is disposed”, the exhaust gas flow rate can be set by appropriately setting the area of the plate body.

[Invention of Claim 3]
In the invention according to claim 1 or claim 2,
“The second sensible heat exchanger may be a bath heat exchanger”.
As described above, a bath heat exchanger not only reheats relatively warm return water, but also generally has a shorter operation time than a floor heating mat. Therefore, compared with the case where the hot water returning from the floor heating mat is reheated, improvement in thermal efficiency by the latent heat exchanger cannot be expected.
Therefore, when the second sensible heat exchanger that recovers the sensible heat of the combustion exhaust gas from the second burner is a heat exchanger for remedy, a latent heat exchanger is provided in the second exhaust passage. It becomes more meaningful to dispose the exhaust resistor.

The present invention has the following specific effects.
According to the first aspect of the present invention, as described above, even if the latent heat exchanger is provided in the hot water supply side exhaust passage, the exhaust gas balance between the hot water supply side heating passage and the second heating passage does not collapse, and the hot water supply burner Smooth combustion of (61) and the second burner can be ensured.

  In addition, a complex heat source device can be manufactured simply by disposing a latent heat exchanger and an exhaust resistor in the second can body connected to the can body (3), so that a hot water supply side exhaust passage and a second exhaust passage are provided. The structure can be simplified as compared with the case where the is formed in separate cans.

In the invention according to claim 2, as described above, the exhaust gas flow velocity can be set by appropriately setting the area of the plate.
According to the invention of claim 3, as described above, it becomes more meaningful to dispose the exhaust resistor in the second exhaust passage.

The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.
As shown in FIG. 1, the composite heat source device according to the present embodiment includes a can body (3) including a rectangular burner box (31) and a body frame (32) continuously provided at an upper end opening portion thereof. An exhaust hood (30), which is a second can body containing a latent heat exchanger (60) and an exhaust resistor (47) described later, is connected to the upper end opening of the can body (3). .
Details of each part will be described below.

[Burner box (31) and its internal structure]
A discharge port (411) of an air supply fan (41) is connected to the air supply port (311) opened in the bottom plate (310) of the burner box (31), and an air supply fan ( A distribution plate (81) having a through hole group for making the combustion air supplied from 41) uniform in place is horizontally arranged.

  The burner box (31) is divided into a combustion section for bath (25) and a combustion section for hot water supply (65) by a partition wall (80) having a two-plate structure in the horizontal direction, and the combustion section for bath (25) Is provided with a memorial burner (21) (corresponding to the “second burner” as the specific matter of the invention described above), and a hot water supply burner (61) is provided in the hot water supply combustion section (65), respectively. Has been.

  The remedy burner (21) is a unit in which a plurality of flat unit burners (210) that are long in the longitudinal direction of the burner box (31) (perpendicular to the plane of FIG. 1) are arranged in the thickness direction. On the other hand, since the hot water supply burner (61) requires a larger capacity than the remedy burner (21), a larger number of unit burners (610) than the unit burner (210) of the remedy burner (21). It is arranged side by side in the direction.

[Body frame (32) and its internal structure]
In the trunk frame (32), the heat exchanger for remedy (22) located above the bath combustion section (25) (corresponding to the “second sensible heat exchanger”, which is the specific matter of the invention described above) And a hot water supply heat exchanger (62) positioned above the hot water supply burner (61) (corresponding to the “first sensible heat exchanger” as the specific matter of the invention described above). Yes.

  The heat exchanger for remedy (22) includes a large number of endothermic fins (22a) arranged side by side with a gap in the front-rear direction, and a meandering endothermic tube (22b) passing through these endothermic fins (22a). ), And the bent piece (S) bent at right angles from both ends of the endothermic fin (22a) in the lateral direction (left-right direction in FIG. 1) is in contact with the adjacent endothermic fin (22a). (See FIG. 6). As a result, the combustion exhaust gas flows only upward in the heat absorbing fins (22a) group. The hot water supply heat exchanger (62) is also composed of a group of heat absorption fins (62a) configured in the same manner and a heat absorption pipe (62b) penetrating therethrough.

Both ends of the heat sink pipe (22b) of the heat exchanger for remedy (22) are connected to both ends of a remedy circuit (23) formed so as to circulate with a bathtub (not shown). ing. Then, when the remedy burner (21) burns and a circulation pump (not shown) in the remedy circuit (23) is activated, the bath water in the bathtub is exchanged with the remedy heat exchanger (22). The bath is recirculated and heated so that the bath can be refurbished.
On the other hand, a latent heat exchanger (60), which will be described later, is connected to the upstream end of the endothermic pipe (62b), so that a heat absorption pipe (64) of the latent heat exchanger (60) → hot water supply (not shown) A path connecting the endothermic pipe (62b) of the heat exchanger (62) for the heat exchanger to the outlet tap (not shown) connected to the downstream end of the endothermic pipe (62b) → the outlet tap connected to the outlet pipe is formed. The When the hot water tap is opened, the hot water supply burner (61) is combusted.

  With the above configuration, in the can body (3), the hot water supply side heating passage (12) connected in the order of the hot water supply burner (61) → the hot water supply heat exchanger (62) → the upper end of the trunk frame (32) is opened. ) And the remedy burner (21) → the remedy heat exchanger (22) → the upper end open portion of the trunk frame (32) in the order of the remedy side heating passage (13) are formed in parallel. . In the present embodiment, the tracking-side heating passage (13) corresponds to the “second heating passage” which is the specific matter of the invention described above.

[Exhaust hood (30) and its internal structure]
An exhaust hood (30) is disposed at the upper end open portion of the body frame (32) constituting the can body (3) so as to straddle the hot water supply side heating passage (12) and the tracking side heating passage (13). Has been.

  As shown in FIGS. 1 to 4, the exhaust hood (30) is a box that opens downward, and the lower open end (33) is connected to the upper open end (34) of the trunk frame (32). The exhaust hood (30) is provided with an exhaust port (35) that opens forward.

  The exhaust hood (30) is provided with an upper horizontal partition plate (36) and a lower horizontal partition plate (37) that divide the interior of the exhaust hood vertically, and as shown in FIG. Both ends of (36) and (37) are joined to both side plates (301) and (302) of the exhaust hood (30).

  As shown in FIGS. 3 and 5, the second exhaust passage (44) and the latent heat recovery chamber (43) are arranged between the upper and lower horizontal partition plates (36) and (37) by a lateral partition plate (38) that is long in the front and rear. (Corresponding to the “hot water supply side exhaust passage” which is the specific matter of the invention described above). Here, the latent heat recovery chamber (43) includes upper and lower horizontal partition plates (36) and (37), a rear perforated plate (45), the horizontal partition plate (38), and an exhaust hood (30 ) Is surrounded by one side plate (302). On the other hand, the second exhaust passage (44) is surrounded by horizontal partition plates (36) and (37), the horizontal partition plate (38), and the other side plate (301) of the exhaust hood (30). It is space.

  The lower horizontal partition plate (37) is inclined forward and downward toward the exhaust port (35), and the drain generated by the latent heat exchanger (60) described later is formed on the bottom plate near the front end of the exhaust hood (30). The drainage collecting groove (39) is guided.

  As shown in FIGS. 2 and 3, the latent heat recovery chamber (43) has an exhaust inlet (370) opened at the rear of the lower horizontal partition plate (37) and a vent hole (450) of the through-hole plate (45). ) Through which the combustion exhaust gas flows. The latent heat recovery chamber (43) is provided with a latent heat exchanger (60) for recovering latent heat from the combustion exhaust gas that has passed through the hot water supply heat exchanger (62). Is supplied to the hot water supply heat exchanger (62) through the latent heat exchanger (60).

The latent heat exchanger (60) has a plurality of serpentine heat absorption tubes (64) arranged in a latent heat recovery chamber (43), and is arranged on one side plate (302) in the horizontal direction of the exhaust hood (30). Water is supplied collectively from the provided water supply header (66) to the upstream end of each heat absorption pipe (64). On the other hand, the hot water flowing out from the downstream end of each heat absorption pipe (64) is taken out from the hot water header (67) and supplied to the heat absorption pipe (62b) of the hot water supply heat exchanger (62).
The endothermic tube (64) has a bellows-like surface for increasing the heat exchange area, and is made of an acid-resistant metal such as stainless steel.

  As shown in FIGS. 3 to 5, the lower horizontal partition plate (37) has an exhaust inlet (371) for taking the combustion exhaust gas that has passed through the heat exchanger (22) for replenishment into the second exhaust passage (44). In the middle of the second exhaust passage (44), a flat plate-like exhaust resistor (47) fixed to the upper horizontal partition plate (36) in a suspended state is provided. The resistor 47 sets the exhaust flow velocity in the second exhaust passage 44 and the upstream heating side passage 13 to an appropriate value. And both side edges of the exhaust resistor (47) are in contact with both side walls (the horizontal partition plate (38) and the side plate (301) of the exhaust hood (30)) of the second exhaust passage (44), A slit-shaped throttle part (48) is formed between the lower edge of the exhaust resistor (47) and the upper and lower sides of the lower horizontal partition plate (37).

The throttle portion (48) can maintain the exhaust balance of the hot water supply side heating passage (12) and the tracking side heating passage (13). For this reason, the magnitude of the exhaust resistance of the hot water supply side heating passage (12) and the tracking side heating passage (13) changes relatively depending on whether or not the latent heat exchanger (60) is provided. The exhaust resistor (47) is provided in such a size that it does not.
The second exhaust passage (44) and the latent heat recovery chamber (43) are joined downstream and connected to the exhaust port (35).

[Action / Effect]
In this case, when the air supply fan (41) is operated and the hot water supply burner (61) is combusted, the combustion exhaust from the hot water supply burner (61) becomes the hot water supply heat exchanger (62) → the lower horizontal partition. It flows through the exhaust inlet (370) of the plate (37) → the vent hole (450) of the through-hole plate (45) → the latent heat recovery chamber (43) → the exhaust port (35) in front of the exhaust hood (30). The sensible heat of the combustion exhaust gas is recovered by the hot water supply heat exchanger (62), while the combustion exhaust gas that has passed through the hot water supply heat exchanger (62) is recovered by the latent heat exchanger (60) in the latent heat recovery chamber (43). Then, it is cooled below the dew point and the latent heat is recovered.

  On the other hand, when the air supply fan (41) is operated and the remedy burner (21) is combusted, the combustion exhaust from the remedy burner (21) becomes the remedy heat exchanger (22) → the lower horizontal It flows along the path of the exhaust inlet (371) of the partition plate (37) → the second exhaust passage (44) → the exhaust port (35) in front of the exhaust hood (30). The sensible heat of the combustion exhaust gas is recovered by the heat exchanger (22) for remedy, so that the hot water heated by the heat exchanger (22) for remedy is not shown via the remedy circuit (23). It is supplied to the bathtub and chased.

  In the present embodiment, as described above, by providing the exhaust resistor (47) in the second exhaust passage (44), the second exhaust passage (44) and the upstream side of the exhaust side are provided. The exhaust gas flow velocity in the heating passage (13) is set to an appropriate value. Accordingly, even if a latent heat exchanger (60) is provided in the latent heat recovery chamber (43) in the exhaust hood (30), which is the second can body connected to the open end of the can body (3), the hot water supply side heating is possible. The exhaust balance of the passage (12) and the heating side heating passage (13) is not lost, and smooth combustion of the hot water supply burner (61) and the heating burner (21) can be ensured.

[Others]
1. A heating heat exchanger for reheating return hot water from a heating terminal such as a floor heating mat may be incorporated in place of the aforementioned heat exchanger for tracking (22). Since the return hot water from the heating terminal such as the floor heating mat is higher than the temperature of the water supplied to the water heater (clean water), it is necessary to install a latent heat exchanger in the exhaust passage on the side of the heating heat exchanger. This is because it is the same as the heat exchanger for remembrance (22).

2. The composite heat source device according to the above embodiment can also be used when chasing a bath using a liquid-liquid heat exchanger that heats the water in the secondary circuit with the hot water in the primary circuit. In this case, the secondary circuit of the liquid-liquid heat exchanger is used as a circulation circulation circuit for the bath, while the heat exchanger that heats the return hot water in the primary circuit of the liquid-liquid heat exchanger is added as described above. It is installed in place of the heat exchanger (22) for firewood.

3. In the above embodiment, a flat plate is adopted as the exhaust resistor (47) disposed in the second exhaust passage (44). However, the passage width is reduced by narrowing the outer peripheral wall of the second exhaust passage (44). The area of the exhaust inlet (371) opened near the rear end of the lower horizontal partition plate (37) is set to a predetermined size without providing a flat exhaust resistor (47). May be.
In this case, the exhaust inlet (371) portion corresponds to an “exhaust resistor” which is a specific matter of the invention described above.

Sectional drawing of the composite heat source device which concerns on embodiment of this invention II-II sectional view of FIG. III-III sectional view of FIG. IV-IV sectional view of FIG. Explanation of structure near second exhaust passage (44) Enlarged view of the main part of the heat exchanger for remembrance (22) Illustration of conventional example

Explanation of symbols

(3) ・ ・ ・ Can body
(12) ... Hot water supply side heating passage
(21) ... memorial burner
(22) ・ ・ ・ Heat exchanger
(60) ... Latent heat exchanger
(61) ... Hot water supply burner
(62) ・ ・ ・ Heat exchanger for hot water supply

Claims (3)

A hot water supply side heating passage provided with a hot water supply burner (61) and a first sensible heat exchanger for recovering sensible heat of combustion exhaust from the hot water supply burner (61);
A second heating passage provided with a second burner different from the hot water supply burner (61) and a second sensible heat exchanger for recovering sensible heat of the combustion exhaust from the second burner. ,
The hot water supply side heating passage and the second heating passage are formed in parallel in a common can body (3), and
In the combined heat source device, wherein the hot water supply burner (61) and a single fan for supplying combustion air to the second burner are provided,
A hot water supply side exhaust passage extending from the downstream end of the hot water supply side heating passage and a second exhaust passage extending from the downstream end of the second heating passage are provided in a second can body connected to the can body (3). Are formed in parallel,
The hot water supply side exhaust passage is provided with a latent heat exchanger that recovers latent heat of the combustion exhaust,
The composite heat source device, wherein the second exhaust passage is provided with an exhaust resistor for appropriately setting the exhaust flow velocity of the second heating passage. The combined heat source device according to claim 1,
The said exhaust resistor is a composite heat source device which is a plate body which the combustion exhaust which flows through the arrangement | positioning part of this exhaust resistor contacts. In the composite heat source device according to claim 1 or 2,
The second sensible heat exchanger is a composite heat source device that is a bath heat exchanger.

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