JP3732885B2 - Insulation device for drain neutralization container - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heat retaining device for a drain neutralization container, and more particularly to a device for retaining a drain neutralization container for neutralizing drain generated by condensation of water vapor in combustion exhaust gas.
[0002]
[Prior art]
FIG. 15 is an explanatory diagram of a heat exchange device (1) and a drain neutralization vessel (2) in a conventional water heater. As shown in the figure, the heat exchange device (1) has a configuration in which a main heat exchanger (12) and a sub heat exchanger (13) are accommodated in a can body (10). A burner device (40) for supplying combustion exhaust to the main / sub heat exchangers (12) (13) is provided at the upper end.
[0003]
In this heat exchange device (1), the heat of the combustion exhaust gas is absorbed by the water pipes of the main and auxiliary heat exchangers (12) and (13). In the main / sub heat exchangers (12) and (13), the water vapor contained in the combustion exhaust gas absorbs heat from the combustion exhaust gas until it becomes a dew point or less. Therefore, the heat exchange efficiency of the heat exchange device (1) is high.
On the other hand, since the water vapor is cooled to a dew point or lower, the water vapor is condensed, and drain adheres to the surface of the water pipe. This drain is discharged from the heat exchange device (1) via the drain discharge path (11) connected to the can (10).
[0004]
And when the said drain is produced | generated, acidic components, such as a nitrogen oxide contained in the said combustion exhaust, melt | dissolve. A drain neutralization vessel (2) containing a neutralizing agent for neutralizing the drain is provided in the drain discharge path (11).
Accordingly, the drain discharged from the heat exchange device (1) to the drain discharge path (11) comes into contact with the neutralizing agent when passing through the drain neutralizing vessel (2). Thereby, the acidic component in the drain is neutralized.
[0005]
[Problems to be solved by the invention]
However, in this conventional technique, when the temperature is lowered in winter, the drain neutralization vessel (2) is cooled and the inside of the vessel becomes low temperature. When the temperature of the neutralizing agent in the drain neutralization container (2) falls below a predetermined temperature, the degree of reaction with the drain is drastically reduced. Therefore, the neutralization is sufficiently performed under the low temperature conditions described above. I will not. In this case, the highly acidic drain is directly discharged to a sewer pipe or the like.
[0006]
An object of the invention of claim 1 is to provide a heat retaining device capable of promoting the reaction of the neutralizing agent in the drain neutralization vessel (2).
[0007]
[Means for Solving the Problems]
The problem-solving means of the invention of claim 1 is: a drain neutralization vessel provided so as to pass drain produced by condensation of water vapor contained in combustion exhaust gas and neutralizing the drain with a built-in neutralizer ( 2) and heating means (4) for heating the drain neutralization vessel (2) based on the heat of the combustion exhaust,
A heat exchange device (1) including a burner device (40) for generating the combustion exhaust and a heat exchanger (1a) for raising the temperature of the water in the water flow pipe by absorbing heat from the combustion exhaust is provided, The drain neutralization container (2) is provided in a drain discharge path (11) for discharging drain generated on the surface of the heat exchanger (1a) due to the endothermic heat from the heat exchange device (1), and the heating means (4) is a configuration in which the drain neutralization vessel (2) is heated by hot water that has passed through the water pipe,
Detection means (5) for detecting the necessity of promoting the reaction of the neutralizing agent, and activating the heating means (4) in response to the detection output of the detection means (5) and warm water in the heating means And control means (6) for performing temperature control ”.
[0009]
In this device, the heat of the combustion exhaust generated by the burner device (40) is absorbed by the heat exchanger (1a). Due to this heat absorption, drainage is generated on the surface of the heat exchanger (1a). The drain is discharged through the drain discharge path (11) and flows into the drain neutralization container (2).
On the other hand, when the reaction of the neutralizer is reduced, the detection means (5) detects the necessity of promoting the reaction of the neutralizer. The control means (6) responding to the detection output from the detection means (5) activates the heating means (4) and controls the temperature of the hot water. Thereby, due to the heat absorption, the water in the water pipe of the heat exchanger (1a) is heated, the drain neutralization vessel (2) is heated by the hot water that has passed through the water pipe, and The drain neutralization container (2) is maintained in a heat retaining state within a predetermined temperature range.
[0010]
Therefore, the drained inflow is neutralized by the neutralizing agent in the drain neutralization vessel (2) which is kept warm by the heating.
In the description of claim 1, specifically, “the heating means (4) is configured to heat the drain neutralization vessel (2) with warm water that has passed through the water pipe” specifically, As in the invention of claim 2, "the hot water passes through the heating pipe portion (31) wound around the outer surface of the drain neutralization vessel (2)", or as in the invention of claim 3, The hot water passes through a water passage (32) provided between the inner surface and the outer surface of the constituent wall of the drain neutralization vessel (2), and the invention according to claim 4, "the hot water is It may pass through the heating tube portion (31) inserted through the constituent wall of the drain neutralization vessel (2).
[0012]
【The invention's effect】
As described above, in the first aspect of the invention, the drain neutralization vessel (2) is maintained in a heat-retaining state within a predetermined temperature range when the reaction of the neutralizing agent is reduced. The neutralization reaction of the neutralizing agent is promoted.
Therefore, even when the drain neutralization container (2) is in a low temperature condition in winter or the like, the heating means (4) maintains the drain neutralization container (2) in a heat retaining state. The neutralization reaction of the drain by the summing agent is promoted.
[0013]
Further, the heating means (4) heats the drain neutralization vessel (2) based on the heat of the combustion exhaust that generates the drain. Therefore, the means for heating is used as the combustion exhaust. There is no need to provide a separate source other than the generation source. Therefore, the overall configuration of the heat retaining device is simplified as compared with the case where the means for heating is separately provided.
Further, since the drain neutralization device (2) is heated by the hot water, the heating device can be easily manufactured. In addition, it is good also as a structure which guides the said warm water with the hot water pipe connected to the downstream of the water flow pipe of the heat exchanger (1a), and the said structure is simplified further in this case.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Embodiment 1]
FIG. 1 is an explanatory view of a heat exchanger (1) and a heat retaining device for a drain neutralization vessel (2) constituting the water heater of Embodiment 1 of the present invention, and FIG. 2 is a heat exchanger of FIG. FIG. 3 is a cross-sectional view of a drain neutralization container (2) and a storage container (2a) provided in the drain discharge path (11) of (1). FIG. 3 is an operation explanatory view of the storage container (2a) of FIG. FIG. 4 is an enlarged cross-sectional view of the heating tube portion (31) wound around the drain neutralization vessel (2) shown in FIGS.
[0016]
* Heat exchanger (1) *
As shown in FIG. 1, the heat exchanging device (1) has a configuration in which main and auxiliary heat exchangers (12) and (13) are accommodated in a can body (10). A burner (14) is provided above the main / sub heat exchangers (12) and (13). In addition, a fan (15) for supplying outside air for combustion to the burner (14) is connected to the upper end of the can body (10). These burner (14) and fan (15) constitute the burner device (40) described in claim 2 above, and combustion exhaust is generated by this burner device (40).
[0017]
The main heat exchanger (12) is on the burner (14) side (upstream side of the flow of combustion exhaust) from the sub heat exchanger (13), and the water pipe of the main heat exchanger (12) It is connected to the downstream side of the water pipe of the heat exchanger (13). A water supply path (17) for feeding water to the auxiliary heat exchanger (13) is connected to the upstream side of the water pipe of the auxiliary heat exchanger (13), and downstream of the water pipe of the main heat exchanger (12). The hot water outlet path (18) for feeding hot water heated by the main / sub heat exchangers (12) (13) is connected to the side.
[0018]
In this apparatus, the combustion exhaust from the burner device (40) first passes through the main heat exchanger (12), and at this time, the sensible heat is absorbed from the combustion exhaust by the main heat exchanger (12). Thereafter, when passing through the auxiliary heat exchanger (13), latent heat is absorbed from the combustion exhaust gas by the auxiliary heat exchanger (13). By this latent heat absorption, the water vapor contained in the combustion exhaust gas is cooled below the dew point, and the water vapor is condensed, whereby drainage is mainly generated in the auxiliary heat exchanger (13). During the condensation, acidic corrosive components such as nitrogen oxides in the combustion exhaust gas dissolve into the drain.
[0019]
The can body (10) includes a gas supply path (14a) for supplying gas to the burner (14), an exhaust passage (16) for discharging the combustion exhaust from the can body (10), and the drain. A drain discharge path (11) for discharging the water from the can body (10) is connected. The drain discharge path (11) is provided with a storage container (2a) and a drain neutralization container (2) which will be described later.
* Storage container (2a) *
As shown in FIGS. 1 and 2, the storage container (2a) is formed in a rectangular box shape as a whole. The storage container (2a) includes a sealed water chamber (21) in which a drain inflow pipe (210) connected to the drain discharge path (11) is inserted from above and stores drain from the heat exchange device (1), A storage chamber (22) connected to the sealed water chamber (21) and storing the drain overflowed from the sealed water chamber (21), and an opposite side of the sealed water chamber (21) to the storage chamber (22) And a siphon (23) connected in series.
[0020]
The siphon (23) includes a vacant chamber (24) communicating with the lower end of the storage chamber (22) via the communication hole (240), and a drain discharge pipe provided in the vacant chamber (24) in the vertical direction. (25). Between the drain discharge pipe (25) (for example, 6 mm in diameter) and the top plate (26) of the vacant room (24), the diameter of the drain discharge pipe (25), the surface tension of the drain, and the rise of the drain water level. In consideration of speed, a gap (for example, 5 mm) is provided below the top plate (26) so as not to cause air accumulation when the water level rises. The top plate (26) is provided slightly lower than the overflow water level of the sealed water chamber (21).
[0021]
* Drain neutralization container (2) *
The drain neutralization container (2) is a substantially vertical cylinder connected to the lower end of the drain discharge pipe (25), and the inner diameter thereof is set larger than the inner diameter of the drain discharge pipe (25). In this drain neutralization container (2), neutralizing agents (20) and (20) made of granules such as magnesium oxide and calcium carbonate are accommodated. A downstream drain discharge path (11) is connected to the lower end of the drain neutralization container (2).
[0022]
A temperature sensor (5a) for detecting the temperature of the drain neutralization container (2) is provided on the constituent wall of the drain neutralization container (2). A detection signal output from the temperature sensor (5a) is applied to a control circuit (61) described later.
* Warm water path (300) *
A hot water path (300) is connected to the hot water path (18) so as to branch from the hot water path (18). The downstream end of the hot water path (300) is connected to the water supply path (17) so as to join the water supply path (17). The hot water passage (300) is provided with a pump (30) that sucks hot water from the hot water supply passage (18) and sends it to the water supply passage (17).
[0023]
The warm water path (300) includes a heating pipe section (31) wound around the outer surfaces of the storage container (2a) and the drain neutralization container (2). As shown in FIG. 4, the heating pipe portion (31) has a circular cross section and is fixed to the outer surfaces of the storage container (2a) and the drain neutralization container (2) by brazing materials (38) (38). .
Furthermore, in this Embodiment 1, it has the structure which controls the temperature of the warm water which flows through a heating pipe part (31).
[0024]
Specifically, a chilled water path that sends chilled water from the upstream side of the connection with the hot water path (300) in the water supply path (17) to the upstream side from the heating pipe section (31) in the hot water path (300). (35) is provided. The cold water path (35) is provided with a second flow rate adjustment valve (92) for adjusting the flow rate of the cold water. In addition, the first flow rate adjustment for adjusting the flow rate of the hot water flowing from the hot water supply route (18) to the hot water route (300) is upstream of the junction with the cold water route (35) in the hot water route (300). A valve (91) is provided.
[0025]
Further, a control circuit (61) for controlling the hot water discharge operation of the heat exchange device (1) including the operation of the first and second flow rate control valves (91) and (92) is provided. Based on the control program stored in the microcomputer of the control circuit (61), the operations of the heat exchange device (1) and the first and second flow rate control valves (91) and (92) are controlled.
* About the operation of the water heater *
FIG. 5 is a flowchart showing a control program of the control circuit (61) of the water heater shown in FIG. This control program starts when the power supply to the water heater is turned on.
[0026]
Below, based on FIG. 5, operation | movement of the said water heater is demonstrated concretely.
When an operation switch (not shown) of the water heater is turned on, the water heater is in an operating state (steps (70), (73)). In this operating state, as described above, the cold water from the water supply path (17) rises due to the heat of the combustion exhaust from the burner (14) when passing through the main / sub heat exchanger (12) (13). It becomes warm and becomes warm water. This hot water is supplied to the kitchen and bath through the hot water supply route (18).
[0027]
Further, in this operation state, the drain mainly generated in the auxiliary heat exchanger (13) is discharged through the drain discharge path (11) and the drain inflow pipe (210) to the sealed chamber (21) of the storage container (2a). Flow into. As shown in FIG. 2, this drain overflows from the sealed water chamber (21), flows into the storage chamber (22), and is stored.
Although the drain water level in the storage chamber (22) rises due to the inflow, the storage chamber (22) and the vacant chamber (24) communicate with each other through the communication hole (240). The water level of (24) rises similarly to the water level of the storage chamber (22).
[0028]
Then, when the water level of the drain in the empty chamber (24) exceeds the upper end of the drain discharge pipe (25), there is no air accumulation between the upper end and the top plate (26) due to surface tension. The Thereby, the upper end opening of the drain discharge pipe (25) is closed by the drain (the state shown in FIG. 3A). This closing operation slightly precedes the rise of the drain water level in the storage chamber (22). After this, when the drain water level in the storage chamber (22) reaches the same height as the top plate (26), the pressure in the empty chamber (24) reaches a predetermined pressure, and the drain discharge pipe (25) is closed. Torn. As a result, the drain in the empty chamber (24) flows into the drain discharge pipe (26), and the suction negative pressure causes the drain in the empty chamber (24) and the storage chamber (22) to flow into the drain discharge pipe (26). And flows out into the drain neutralization container (2). Then, when the drain water level coincides with the communication hole (240), air enters the empty chamber (24), the suction negative pressure disappears, and the drain discharge ends (the state shown in FIG. 3B).
[0029]
In this case, the drain inflow into the storage chamber (22) and the drain discharge from the storage chamber (22) by the siphon (23) are repeatedly performed.
The drain that has flowed into the drain neutralization vessel (2) passes downward through the drain neutralization vessel (2). At this time, the drain is neutralized by contacting with the neutralizing agents (20) and (20). The neutralized drain is discharged from the drain neutralization vessel (2) to the drain discharge path (11) on the downstream side.
[0030]
On the other hand, when the operation switch of the water heater is turned on, the pump (30) of the hot water path (300) is turned on in step (74), and hot water flows from the hot water path (18) to the hot water path (300). .
When the operation switch is turned on, in step (71), the temperature detected by the temperature sensor (5a) provided in the drain neutralization vessel (2) is the first set temperature (51) (for example, 25 ° C.). It is determined whether or not:
[0031]
When the outside air temperature is low and the detected temperature is equal to or lower than the first set temperature (51), the process proceeds to step (72). In this step (72), the first flow rate control valve (91) is fully opened. The second flow rate adjustment valve (92) is fully closed. Thereby, the temperature of the storage container (2a) and the drain neutralization container (2) rises due to the heat of the hot water flowing through the heating pipe part (31). When the detected temperature reaches the first set temperature (51) (for example, 25 ° C.), the opening of the first flow control valve (91) is reduced and the opening of the second flow control valve (92) is increased. (Steps (75) and (76)). As a result, the amount of cold water supplied from the cold water passage (35) flowing into the heating pipe section (31) increases, the temperature of the hot water decreases, and the temperature of the storage container (2a) and the drain neutralization container (2) Decreases. Further, when the detected temperature falls below the second set temperature (52) (for example, 20 ° C.) lower than the first set temperature (51), the first flow rate adjusting valve (91) is opened contrary to the above. Increase the degree and decrease the opening of the second flow rate control valve (92) (steps (77), (78)). Thereby, the supply amount of the cold water decreases, and the temperature of the hot water rises. Thereafter, these steps (75) to (78) are repeatedly executed until the operation switch is turned off.
[0032]
If the outside air temperature is high and it is determined in step (71) that the detected temperature is equal to or higher than the first set temperature (51), step (72) described above is not executed and step (76) is performed. ), The operation of decreasing the opening of the first flow rate control valve (91) and increasing the opening of the second flow rate control valve (92) is performed. As a result, the temperature of the hot water decreases, and the temperatures of the storage container (2a) and the drain neutralization container (2) decrease. Thereafter, the same steps (75) to (78) as described above are repeatedly executed.
[0033]
By the above temperature control, the storage container (2a) and the drain neutralization container (2) are maintained within a predetermined temperature range (about 20 to 25 ° C.).
When the operation switch is turned off, the water heater and the pump (30) are stopped (steps (79), (80), (81)).
In this case, the heating pipe portion (31) of the hot water path (300) is brazed in a state of being wound around the storage container (2a) and the drain neutralization container (2), so that the heat of the hot water is heated. It is transmitted from the pipe section (31) to the storage container (2a) and the drain neutralization container (2). As a result, the storage container (2a) and the drain neutralization container (2) are maintained in a heat insulating state.
[0034]
Therefore, the heat is transferred to the internal neutralizing agent (20) (20) through the constituent wall of the drain neutralizing vessel (2), and the neutralizing agent (20) (20) and the drain neutralizing vessel (2) The neutralization reaction with the drain flowing into the water is promoted. In addition, since the storage container (2a) is maintained in the heat insulation state, the drain flowing from the storage container (2a) into the drain neutralization container (2) is also in the heat insulation state. Thereby, the effect of promoting the neutralization reaction is further improved.
[0035]
In this apparatus, the main / sub heat exchangers (12), (13) to the hot water path (300) are the heating means (4) according to claim 1 described above. The main / sub heat exchangers (12) and (13) are the heat exchanger (1a) described in claim 1. Note that an on-off valve such as a solenoid valve may be used instead of the first and second flow rate control valves 91 and 92 in this embodiment.
[0036]
Further, only one of the first and second flow rate control valves (91) and (92) may be provided. In this case, the mixing ratio of the hot water and the cold water flowing to the heating pipe section (31) is adjusted by changing the opening degree of the flow rate control valve, and the same effect as the above embodiment is achieved. Moreover, it is good also as a structure which sets the opening degree of a 1st flow control valve (91) based on the detected temperature of a temperature sensor (5a), without providing a cold water path | route (35).
[0037]
[Embodiment 2]
FIG. 6 is an explanatory diagram of the hot water heating system according to the second embodiment.
[0038]
As shown in the figure, the heat exchange device (1), the storage container (2a), and the drain neutralization container (2) used in this hot water heating system have the same configuration as in the first embodiment. In this hot water heating system, the circulation path is connected to connect the downstream end of the water pipe of the main heat exchanger (12) of the heat exchange device (1) and the upstream end of the water pipe of the auxiliary heat exchanger (13). (400) is provided. This circulation path (400) is provided with a heat radiating device (37) such as a floor heating radiator and a pump (30). In addition, a part of the path downstream of the heat dissipation device (37) in the circulation path (400) is wound around the storage container (2a) and the drain neutralization container (2), and the wound part is already existing. The heating pipe section (31) according to claim 2.
[0039]
The hot water heating system includes a control circuit (61) (not shown) similar to that of the first embodiment. The operation of the hot water heating system is controlled by the control program of the control circuit (61). Further, when the operation is stopped, the control for preventing freezing of the circulating water in the circulation path (400), the drain in the storage container (2a), and the drain in the drain neutralization container (2) is performed. Executed.
[0040]
FIG. 7 is a flowchart showing a control program of the control circuit (61) of the hot water heating system of FIG. As shown in FIG. 7, when an operation switch (not shown) of the hot water heating system is turned on, the hot water heating system is in an operating state (steps (83) and (84)). That is, the heat exchange device (1) is in an operating state, the pump (30) is turned on, and hot water flows through the circulation path (400). The heat of the warm water is radiated by the heat radiating device (37), and the temperature of the warm water decreases. After this, when passing through the heating pipe (31) wound around the storage container (2a) and the drain neutralization container (2), the storage container (2a) and the drain neutralization container (2 ) Is kept warm. Thereby, the neutralization reaction of a drain is accelerated | stimulated like the said Embodiment 1. FIG.
[0041]
Although the temperature of the hot water further decreases as it passes through the heating pipe section (31), it returns to the auxiliary / main heat exchangers (13) and (12) and is reheated. Such circulation of warm water is continued until the operation switch is turned off (steps (84) and (85)).
When the operation switch is turned off, the operation of the hot water heating system is stopped (steps (85) and (86)).
[0042]
While the operation of the hot water heating system is stopped, the temperature detected by the temperature sensor (5a) provided in the drain neutralization vessel (2) is the third set temperature (53) (for example, as in the first embodiment). When the temperature is 3 ° C. or lower, the hot water heating system is operated at a low output (steps (87) and (88)). By this operation, the water passing through the circulation path (400) is heated, and the storage container (2a) and the drain neutralization container (2) are heated.
[0043]
When the detected temperature reaches the fourth set temperature (54) (for example, 10 ° C.), the operation of the hot water heating system is stopped (steps (89) and (90)). Thereby, heating of the storage container (2a) and the drain neutralization container (2) is completed. Accordingly, even when the operation is stopped, the low output operation maintains the storage container (2a) and the drain neutralization container (2) within a predetermined temperature range (3 ° C. to 10 ° C.), and the circulation in the circulation path (400). Freezing of water, the stored drain in the storage container (2a), and the drain attached to the inner wall of the drain neutralization container (2) is prevented.
[0044]
In this device, the temperature sensor (5a) is the detection means (5) according to the first aspect. The detection means (5) is not limited to the temperature sensor (5a) as long as it detects the necessity of preventing the drain neutralization container (2) from freezing. For example, it may be detected by a bimetal temperature switch, or it may detect the air temperature or the water temperature in the circulation path (400).
[0045]
In the first embodiment described above, as in the second embodiment, the anti-freezing operation for circulating the hot water through the hot water path (300) based on the temperature detected by the temperature sensor (5a) is performed. Can be adopted.
[Embodiment 3]
FIG. 8 is an explanatory diagram of the hot water heating system according to the third embodiment.
[0046]
In this third embodiment, in the hot water heating system of the second embodiment described above, a hot water path (300) bypassed to the circulation path (400) is provided, and the heating pipe section is provided in the hot water path (300). (31). The warm water path (300) is provided with a first flow rate control valve (91), which is heated based on the temperature detected by the temperature sensor (5a) provided in the drain neutralization vessel (2). The temperature of the hot water flowing through the pipe part (31) is controlled.
[Other embodiments]
[0047]
1. As shown in FIG. 9, the drain neutralization vessel (2) and the heating tube portion (31) wound around the drain neutralization vessel (2) may be covered with a heat insulating material (44). In this case, the heat conduction loss from the heating tube (31) to the drain neutralization vessel (2) is reduced, and the heating efficiency of the drain neutralization vessel (2) is improved.
2. As shown in FIG. 10, the heating tube portion (31) is configured to include a flat portion (311) in which a part of the cross section is linearly formed, and the flat portion (311) is a drain neutralization container ( It is good also as a structure which touches the outer surface of 2). In this case, since the contact area between the heating pipe part (31) and the drain neutralization container (2) is increased, the thermal conductivity from the heating pipe part (31) to the drain neutralization container (2) is improved. Needless to say, the heating tube (31) in this case may be brazed to the drain neutralization vessel (2).
[0048]
3. As shown in FIGS. 11 and 12, warm water may be passed through a water passage (32) formed in a spiral shape between the inner surface and the outer surface of the constituent wall of the body portion of the drain neutralization container (2). Moreover, as shown in FIG. 13, the said structural wall may be comprised from an inner cylinder (201) and an outer cylinder (202), and you may make it flow the said warm water in the clearance gap between them. The gap functions as the water passage (32).
[0049]
4). As shown in FIG. 14, the hot water may be allowed to flow through the heating pipe portion (31) that passes through the constituent wall of the drain neutralization vessel (2) and is inserted into the inside.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram of a heat exchanger (1) and a heat retaining device for a drain neutralization vessel (2) constituting the water heater according to Embodiment 1 of the present invention. FIG. 2 is a heat exchanger (1) in FIG. FIG. 3 is a sectional view of a drain neutralization container (2) and a storage container (2a) provided in the drain discharge path (11) of FIG. 3. FIG. 3 is an operation explanatory diagram of the storage container (2a) of FIG. Fig. 5 is an enlarged cross-sectional view of the heating pipe section (31) wound around the drain neutralization vessel (2) of Fig. 5. Fig. 5 is a flowchart showing a control program of the control circuit (61) of the water heater in Fig. 1. Explanatory drawing of the hot water heating system of Embodiment 2 [FIG. 7] A flowchart showing a control program of the control circuit (61) of the hot water heating system of FIG. 6 [FIG. Explanatory drawing of the heat retention apparatus of the drain neutralization container (2) of other embodiment. [FIG. 10] Sectional drawing of the heating pipe part (31) of other embodiment. Fig. 12 is a longitudinal sectional view of the drain neutralization vessel (2) of the embodiment of Fig. 12. Fig. 12 is a sectional view of VIII-VIII of the drain neutralization vessel (2) of Fig. 11. Fig. 13 is a drain neutralization vessel of another embodiment. Fig. 14 is a longitudinal sectional view of the drain neutralization vessel (2) of another embodiment. Fig. 15 is a heat exchange device (1) and a drain neutralization vessel in a conventional water heater. Illustration of (2) [Explanation of symbols]
(2) ... Drain neutralization container
(4) ... Heating means
(1) ・ ・ ・ Heat exchange device
(1a) ・ ・ ・ Heat exchanger
(11) ... Drain discharge route
(5) ... Detection means
(6) ... Control means

Claims (4)

A drain neutralization vessel (2) provided so as to pass drain generated by condensation of water vapor contained in combustion exhaust gas and neutralizing the drain with a built-in neutralizer, and this drain neutralization vessel (2) And heating means (4) for heating based on the heat of the combustion exhaust,
A heat exchange device (1) including a burner device (40) for generating the combustion exhaust and a heat exchanger (1a) for raising the temperature of water in the water flow pipe by absorbing heat from the combustion exhaust is provided, The drain neutralization vessel (2) is provided in a drain discharge path (11) for discharging drain generated on the surface of the heat exchanger (1a) by the endothermic heat from the heat exchange device (1), and the heating means (4) is a configuration in which the drain neutralization vessel (2) is heated by warm water that has passed through the water pipe,
Detection means (5) for detecting the necessity of promoting the reaction of the neutralizing agent, and activating the heating means (4) in response to the detection output of the detection means (5) and warm water in the heating means A heat retaining device for a drain neutralization container, comprising control means (6) for performing temperature control.   The said warm water is a heat retention apparatus of the drain neutralization container of Claim 1 which passes the heating pipe part (31) wound around the outer surface of the said drain neutralization container (2).   The heat retaining device for a drain neutralization container according to claim 1, wherein the warm water passes through a water passage (32) provided between an inner surface and an outer surface of a constituent wall of the drain neutralization container (2).   The said warm water is a heat retention apparatus of the drain neutralization container of Claim 1 which passes the heating pipe part (31) penetrated through the structural wall of the said drain neutralization container (2), and is penetrated in the inside.

Images