JP2012198017A - Combustion device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately monitor a storage state in a drain tank of condensates generated by recovering the latent heat of combustion gas for hot-water supply and combustion gas for heating.SOLUTION: The combustion device includes a hot-water supplying sub-heat exchanger 8 and a heating sub-heat exchanger 9" for recovering the latent heat of the combustion gas for hot-water supply and the combustion gas for heating. A condensate draining means 40 includes a common drain tank 44 for storing the condensates from the hot-water supplying sub-heat exchanger 8 and the heating sub-heat exchanger 9", and a valve means 49 provided at the downstream side thereof. A control means stores the condensates into the drain tank 44 by closing the valve means 49, and drains the condensates to an additional heating circuit 20A by opening the valve means 49. The control means sums up an integrated combustion heat quantity in a hot-water supplying burner 4a from the time after the last drainage, and a converted combustion heat quantity obtained by multiplying an integrated combustion heat quantity in a heating burner 4c with a factor smaller than 1, and monitors the storage state in the drain tank 44, based on the total combustion heat quantity or a condensate generation amount corresponding thereto.

Description

  The present invention relates to a high-efficiency combustion apparatus having functions of hot water supply and heating and capable of recovering the latent heat of combustion gas, and more particularly relates to an improvement in monitoring the storage status of condensed water generated during the recovery of latent heat.

A hot water supply apparatus (combustion apparatus) in which a main / sub heat exchanger is disposed above a hot water supply burner is known. A hot water supply circuit passes through these heat exchangers.
The main heat exchanger at the lower stage (upstream side) collects sensible heat in the combustion gas in the same manner as a hot water supply apparatus including a general one-stage heat exchanger. The upper (downstream) auxiliary heat exchanger condenses water vapor (moisture generated by combustion) in the combustion gas to recover latent heat. Since about 80% of the thermal energy of the combustion gas is recovered by the sensible heat recovery and about 15% is recovered by the latent heat recovery, the thermal efficiency becomes very high.

  In the hot water heater with high efficiency as described above, water vapor condenses in the auxiliary heat exchanger. This condensed water exhibits strong acidity because sulfur oxides, nitrogen oxides and the like produced by combustion dissolve into sulfuric acid, nitric acid and the like. Therefore, the strongly acidic condensed water is neutralized or diluted. Further, since the condensed water is generated in several liters per day under normal use conditions, the waste water treatment is required.

  Therefore, in the conventional high-efficiency hot water supply apparatus, a recovery tray is disposed below the auxiliary heat exchanger, a dedicated drain pipe is connected to the recovery tray, and a neutralizer such as calcium carbonate is accommodated in the drain pipe. A neutralizer was provided, and the condensed water collected by the collection tray was neutralized by the neutralizer and drained from the drain pipe.

  However, there are cases where there is no space to install a dedicated drain pipe, or it may be difficult to form a drainage groove that guides the condensed water from the drain pipe in the building, which may prevent the spread of high-efficiency water heaters It was.

  In order to eliminate the above inconvenience, Patent Document 1 proposes a high-efficiency hot water supply apparatus that drains condensed water to a bathtub. In the hot water supply device with a reheating function shown in FIG. 8 of Patent Document 1, a recovery tray is disposed below the auxiliary heat exchanger, one end of the drain circuit is connected to the recovery tray, and the other end of the drain circuit is connected to the reheating device. It is connected to the suction side of the pump in the return path of the circulation circuit. The drain circuit is provided with a neutralizer and a drain tank in order toward the downstream side.

  A three-way switching valve is provided at a connection point between the drain circuit and the additional circulation circuit. When it is not time to drain condensed water (drain drainage), the switching valve allows the pump suction side to communicate with the bathtub, shuts off the drain circuit, and allows the hot water to circulate in the additional circulation circuit by driving the pump. ing. At the time of drainage, the pump suction side is connected to the drain circuit by switching the switching valve, and the pump is driven so that the condensed water accumulated in the drain tank is drained to the bathtub through the additional circulation circuit. ing.

In the hot water supply apparatus of Patent Document 1, as the drain drain timing, for example, it is detected that the bathtub tap has been removed and the bath water has been drained. After drain drainage, the switching valve is switched to shut off the drain circuit side, and the piping of the recirculation circuit is washed with hot water from the hot water supply circuit.
As another drainage timing, when the drain level detection means provided in the drain tank detects the full water level of the condensate, an alarm is issued to urge the user to drain the water by unplugging the bathtub. Sometimes drains.

  Further, Patent Document 2 calculates an integrated combustion heat amount in a high-efficiency hot water supply apparatus having a drain drainage structure similar to Patent Document 1, instead of providing a drain level detection means, and this integrated combustion heat amount is a set value ( It is proposed to drain condensate water when the drain tank reaches the full amount of heat of combustion that is full).

JP 2005-265228 A JP-A-2005-90922

In the hot water supply apparatus of Patent Document 1, the drain level detecting means is composed of a plurality of electrodes, and the drain level cannot be detected steplessly.
In the hot water supply device of Patent Document 2, the accumulated combustion heat amount is made to correspond to the stored amount of condensate, which suggests the possibility of more accurately grasping the storage state, but a combustion device having functions of hot water supply and heating. In Japanese Patent Laid-Open No. 2003-260, no proposal is made on how to calculate the amount of condensed water stored in the drain tank or the cumulative amount of combustion heat corresponding to this amount of stored water when recovering the latent heat of combustion gas.

The present invention has been made to solve the above-mentioned problems, and is a hot water supply burner, a heating burner, and a hot water supply main heat exchanger that recovers sensible heat of combustion gas from the hot water supply burner and the heating burner, respectively. And a main heat exchanger for heating, a sub-heat exchanger for hot water and a sub-heat exchanger for heating that respectively recover the latent heat of combustion gas at the downstream side of these main heat exchangers, and the main heat exchanger for hot water supply and the hot water supply A hot water supply circuit that passes through the auxiliary heat exchanger for heating, a heating circulation circuit that passes through the heating main heat exchanger and the heating auxiliary heat exchanger, an additional circulation circuit connected to the bathtub, and the additional circulation circuit Condensed water that collects and drains the condensed water generated by condensing the water in the combustion gas in the above-mentioned pump and reheating heat exchanger and the sub-heat exchanger for hot water supply and the sub-heat exchanger for heating. Drain means, hot water supply burner, and heating bar And comprising control means for controlling the condensed water drain means, and
The condensed water drain means includes a common drain tank that stores condensed water from the hot water supply auxiliary heat exchanger and the heating auxiliary heat exchanger, and valve means provided on the downstream side of the drain tank,
The control means stores condensate water in the drain tank by closing the valve means, and opens drain means for draining condensate water from the drain tank to the additional circulation circuit by opening the valve means. In the combustion device to be performed,
The control means adds up the accumulated combustion heat amount in the hot water burner after the drain drainage last time and the converted combustion heat amount obtained by multiplying the accumulated combustion heat amount in the heating burner by a coefficient smaller than 1, and adds up the sum. The storage state of the condensed water in the drain tank is monitored based on the amount of combustion heat or the amount of condensed water generated corresponding thereto.

  According to the above configuration, the amount of condensed water generated in the heating sub-heat exchanger with respect to the amount of combustion heat in the heating burner is equal to the amount of condensed water generated in the sub-heat exchanger for hot water supply relative to the amount of combustion heat in the hot-water supply burner. In consideration of the fact that the amount of combustion heat in the heating burner is multiplied by a factor less than 1, the converted combustion heat amount in the hot water burner is added to the cumulative combustion heat amount in the hot water burner. The water storage status can be accurately monitored.

  Preferably, the downstream end of the drain means is connected to the suction side of the pump in the additional circulation circuit, and the valve means includes a three-way switching valve provided at a connection point between the drain circuit and the additional circulation circuit. In the shutoff position of the switching valve, the pump suction side is communicated with the bathtub and shut off from the drain tank, and in the communication position of the switching valve, the pump suction side is communicated with the drain tank, and the control means When draining the drain, the pump suction side is communicated with the drain tank by the switching operation of the switching valve, and the pump is driven.

Preferably, the additional heat exchanger is a liquid / liquid heat exchanger, and the additional circulation circuit performs heat exchange with the heating / circulating circuit in the liquid / liquid heat exchanger.
Preferably, the control means further comprises a hot water circuit having an upstream end connected to the hot water supply circuit and a downstream end connected to the recirculation circuit, and a pouring valve provided in the hot water circuit. The automatic operation is executed in response to the automatic operation command from the automatic operation command means, and in this automatic operation, the hot water burner is burned and the pouring valve is opened until the bath water level reaches the set water level. The hot water filling mode in which hot water from the hot water supply circuit is supplied to the bathtub through the hot water filling circuit is executed, and after completion of the hot water filling mode, the hot water in the bathtub is circulated by circulating the hot water in the bathtub by driving the pump. Executes the heat retention mode that maintains the set temperature.

  ADVANTAGE OF THE INVENTION According to this invention, the storage condition of the condensed water produced | generated by the latent heat collection | recovery with the combustion apparatus which has the function of hot water supply and heating can be monitored correctly.

It is a circuit block diagram of the hot water supply apparatus with a chasing function which is a reference embodiment. It is a figure which shows the principal part of the remote control used in the embodiment. In the same embodiment, it is a flowchart of control executed when an automatic operation switch is turned on. In the same embodiment, it is a flowchart of control executed in response to drain switch on. 4 is a flowchart of control executed when an automatic operation switch is turned off in the embodiment. It is a circuit block diagram of the hot-water supply apparatus with a heating and a chasing function which makes one Embodiment of this invention.

  Hereinafter, an integrated two-can two-water channel type hot water supply device (combustion device) with a remnant function that constitutes a reference embodiment will be described with reference to FIGS. This hot water supply apparatus has a hollow can 1 having a rectangular parallelepiped shape. A common fan 2 is provided at the bottom of the can 1 for hot water supply and memorial service. An exhaust port 3 is provided.

  The internal space of the can 1 is partitioned by a partition plate 1x into a hot water supply space 1a and a memorial space 1b. A hot water supply burner 4a is arranged in the lower part of the hot water supply space 1a, and a hot water burner 4b is arranged in the memorial space 1b.

The pipes for supplying the fuel gas to the burners 4a and 4b include a main pipe 5x, a branch pipe 5a for connecting the main pipe 5x to the hot water supply burner 4a, and a main pipe 5x for connecting to the reheating burner 4b. And a branch pipe 5b. In the present embodiment, since the hot water supply burner 4a has three combustion areas, the number of branch pipes 5a is also three.
The main pipe 5x is provided with an original gas electromagnetic valve 6x and a gas proportional valve 6y, and the branch pipes 5a and 5b are provided with branch electromagnetic valves 6a and 6b, respectively.

  In the hot water supply space 1a, a sensible heat recovery main heat exchanger 7 (hot water supply main heat exchanger) is disposed above the burner 4a, and a sub heat exchange for latent heat recovery is further above (downstream). An appliance 8 (sub-heat exchanger for hot water supply) is disposed. Further, in the remedy space 1b, a remedy heat exchanger 9 is disposed above the burner 4b. In the present embodiment, the heat exchangers 7 and 9 are configured by heat receiving tubes 7a and 9a and a large number of fins, and the heat exchanging unit 8 is configured by a heat receiving tube 8a.

  The hot water supply apparatus includes a hot water supply circuit 10 (circuit), a memorial circuit 20, and a hot water filling circuit 30.

  The hot water supply circuit 10 is configured by connecting the water supply pipe 11, the heat receiving pipe 8a, the heat receiving pipe 7a, and the hot water supply pipe 12 in this order from the upstream side to the downstream side. A bypass pipe 13 that bypasses the heat exchangers 7 and 8 is connected between the water supply pipe 11 and the hot water supply pipe 12.

  In the water supply pipe 11, a water amount sensor 14 and a water amount control valve 15 are provided upstream of the bypass pipe 13, and a bypass control valve 16 is provided at a connection point between the bypass pipe 13 and the water supply pipe 11. Further, the water supply pipe 11 is provided with an incoming water temperature sensor (not shown), the hot water supply pipe 12 is provided with a heat exchange outlet temperature sensor 17 upstream of the bypass pipe 13, and the hot water temperature is provided downstream of the bypass pipe 13. A sensor 18 is provided.

  The memorial circulation circuit 20 is configured by connecting a return pipe 21 (return path section), a heat receiving pipe 9a, and an outgoing path pipe 22 (forward path section) in order. The suction end of the return pipe 21 and the discharge end of the forward pipe 22 are connected to a circulation fitting (not shown) provided on the side wall of the bathtub 70. The return pipe 21 is provided with a pump 23, a water level sensor 24 (tub water level detection means), and a water flow switch 25 (water flow detection means).

  One end (upstream end) of the hot water filling circuit 30 is connected to the downstream side of the hot water temperature sensor 18 in the hot water supply pipe 12, and the other end (downstream end) is connected to the suction side (upstream side) of the pump 23 in the return pipe 21. Connected (the connection point is indicated by P1).

  The hot water filling circuit 30 is provided with a hot water solenoid valve 31 (a hot water valve), a check valve 32, and a water amount sensor 33.

  Next, the condensed water drain means 40 that collects and drains the condensed water condensed in the auxiliary heat exchanger 8 will be described. The drain means 40 has a collection tray 41 and a drain circuit 42. The recovery tray 41 is disposed below the auxiliary heat exchanger 8 in the hot water supply space 1a and has a shallow funnel shape.

  The drain circuit 42 is composed of a pipe, one end is connected to the bottom of the collection tray 41, and the other end is connected to the suction side (upstream side) of the pump 23 in the return pipe 21. A switching valve 49 composed of a two-position three-way valve is provided at this connection point (indicated by reference numeral P2). The switching valve 49 has a valve case and a valve body accommodated in the valve case so as to be rotatable (slidable), and is a type of sealing with a sliding surface.

  Further, the drain means 40 includes a neutralizer 43, a drain tank 44, and a drain side electromagnetic valve 45 (drain valve) provided in order from the upstream side to the downstream side in the drain circuit 42. The switching valve 49 and the drain side solenoid valve 45 constitute valve means defined in the claims.

  The neutralizer 43 contains a neutralizing agent such as calcium carbonate which is granular. The neutralizer 43 is provided with two electrodes 43a for detecting an increase in the water level due to clogging.

  The drain tank 44 is provided with a drain level detecting means 50. In the present embodiment, the drain level detecting means 50 has a ground electrode 51 whose lower end is in the vicinity of the bottom of the drain tank 44 and two electrodes 52 and 53 having different lower end heights. The lower end height of one electrode 52 indicates the full water level (drain level 2) of the drain tank 44, and the lower end height of the other electrode 53 indicates a level lower than the full water level (drain level 1). In this embodiment, drain level 1 is higher than half of drain level 2. For example, if the drain level 2 is 3.5 liters, the drain level 1 is 3.0 liters. It should be noted that the actual capacity of the drain tank 44 may be the same as the full water level or may be slightly larger than this.

  In the drain circuit 42, the pipe portion on the upstream side of the drain tank 44 is connected to the upper end of the drain tank 44 or the vicinity of the upper end, and the pipe portion on the downstream side of the drain tank 44 is connected to the bottom portion of the drain tank 44.

  The hot water supply apparatus further reads control information from the various sensors and detection means described above and controls the various components described above, and a remote controller 65 (hereinafter referred to as a remote controller) connected to the control means 60. The remote controller 65 includes a remote control switch 65x for turning on and off the remote control 65, an automatic operation switch 65y (automatic operation command means), and a memory switch (not shown) as shown in FIG. And a drain switch 65z (drain drainage command means), a setting unit for setting the temperature of the hot water supply and the bathtub, a water level setting unit (not shown) for setting the bathtub water level, a set temperature, a set time, a warning, and the like are displayed. A display unit 65a (display means) is provided.

  The operation of the hot water supply apparatus having the above configuration will be described. The solenoid valves 6x, 6a, 6b, 31, 45 are normally closed and are opened by an on operation.

  When a hot water tap or a shower provided at the downstream end of the hot water supply pipe 12 is opened, water flows into the hot water supply circuit 10, and when this is detected by the water amount sensor 14, the control means 60 opens the original gas solenoid valve 6x and the branch solenoid valve. At least one of 6a is opened, and the combustion operation of the hot water supply burner 4a is performed. The combustion gas passes through the main heat exchanger 7, further passes between the recovery tray 41 and the can 1, passes through the auxiliary heat exchanger 8, and is discharged from the exhaust port 3. The water that has entered from the water supply pipe 11 is heated by the sub-exchanger 8 and further heated by the main heat exchanger 7 to become hot water having a set temperature and discharged from the hot water supply pipe 12 (hot water supply operation).

  The water condensed in the auxiliary heat exchanger 8 falls from the auxiliary heat exchanger 8 to the recovery tray 41, reaches the neutralizer 43 through the drain circuit 42, and is neutralized by the neutralizer in the neutralizer 43. It is summed and stored in the drain tank 44. Therefore, during the hot water supply operation, condensed water is generated in the auxiliary heat exchanger 8, and the level of the condensed water in the drain tank 44, that is, the drain level, continues to rise.

When the drain level 1 is detected by the drain level detection means 50 during the hot water supply operation, a warning message “full water warning” is displayed on the display unit 65a of the remote controller 65 when there is residual water in the bathtub and drainage is not performed. When the drain level 2 (full water level) is detected, a warning message “full water” is displayed on the display unit 65a of the remote controller 65, and the combustion of the hot water supply burner 4a is stopped (hot water supply stop). Therefore, water will come out if the tap is left open.
When the combustion is stopped due to the detection of the full water level, the water amount control valve 15 is controlled to gradually reduce the water amount to a predetermined water amount (for example, 5 liters per minute). Alternatively, the combustion may be stopped after a predetermined time (for example, 1 minute) after starting to reduce the amount of water. In this way, it is possible to prevent the user from feeling uncomfortable due to suddenly cold water coming out of combustion stop, and the increase in the amount of condensed water can be kept small.

When the automatic operation switch 65y is turned on, the control means 60 basically executes automatic operation. This automatic operation includes a hot water filling mode and an automatic heat insulation mode thereafter.
In the hot water filling mode, the hot water solenoid valve 31 is opened and combustion is performed in the hot water supply burner 4a in the same manner as in the hot water supply operation. It is supplied to the bathtub 70 via the circuit 20.

  In the automatic warming mode, the pump 23 is driven at a predetermined time interval after the water level of the bathtub 70 reaches the set water level due to the hot water filling, so that the bathtub temperature sensor (not shown) provided in the return path section 21 becomes the set temperature. In addition, combustion of the burner 4b for remedy is executed (remedy), and the hot water in the bathtub 70 is kept at the set temperature.

  During the hot water filling, similarly to the hot water supply operation, condensed water is generated in the auxiliary heat exchanger 8, and this condensed water is recovered, neutralized, and stored in the drain tank 44. Therefore, a warning is displayed at the drain level 1 as in the hot water supply operation, and a warning is displayed and the hot water is stopped at the drain level 2.

  In the present embodiment, the control shown in FIG. 3 is executed when the automatic operation switch 65y of the remote controller 65 is turned on in order to avoid the hot water stop during the hot water filling or the hot water supply stop during bathing. First, the lamp indicating the automatic operation state of the remote controller 65 is turned on (step 101), then the integrated combustion heat quantity Q1 after the previous drain drainage is calculated (step 102), and this integrated combustion heat quantity Q1 is generated as condensed water. The amount is converted into the amount L1 of condensed water stored in the drain tank 44 (step 103).

The accumulated combustion heat amount and the amount of condensed water generated have a substantially corresponding relationship, but in order to more accurately correspond to the amount of condensed water generated, it is desirable to correct the amount of condensed water generated as follows.
(1) The greater the amount of combustion heat per unit time, the more the generated amount is corrected.
(2) As the number of combustion regions of the hot water supply burner 4a increases, the amount of generation is corrected.
(3) The higher the environmental humidity, the more the generated amount is corrected.
(4) The amount of generation is corrected more as the environmental temperature is lower.

  In addition, when correcting by environmental humidity, a humidity sensor may be used and humidity may be estimated without using a humidity sensor. For example, from the relationship between the driving time of the pump 23 (that is, the amount of condensed water stored in the drain tank 44) when the drainage is performed by the pump 23 and the accumulated combustion heat amount after the drainage as described later. , Guess the humidity.

  Next, after driving the pump 23 for a predetermined time (short time) (step 104), the water level (remaining water amount) of the bathtub 70 detected by the water level sensor 24 is read (step 105). From this detected water level, the amount of hot water required to reach the set water level is calculated (step 106).

  Next, based on the amount of hot water filling, the set temperature, and the incoming water temperature (detected temperature of the incoming water temperature sensor provided in the water supply pipe 11), an expected combustion heat quantity Q2 'required for hot water filling is calculated, An expected combustion heat quantity Q2 ″ required for hot water supply is calculated, and the sum Q2 = Q2 ′ + Q2 ″ is obtained (step 107).

  The expected amount of combustion heat Q2 'required for the hot water filling is obtained by multiplying the difference between the set temperature and the incoming water temperature by the hot water filling amount. The predicted amount of combustion heat Q2 ″ required for hot water supply during bathing may be the maximum value of the amount of combustion heat consumed in hot water supply during a plurality of automatic operations before this automatic operation. You may multiply the maximum value of the amount of hot water used by the difference between the current set temperature and the incoming water temperature.

Next, the predicted combustion heat quantity Q2 is converted to the predicted generation amount L2 of condensed water in the same manner as described above (step 108).
Next, it is determined whether or not the sum of the condensate storage amount L1 and the predicted generation amount L2 exceeds the storage amount L0 corresponding to the full water level (step 109). If a negative determination is made here, hot water filling is performed as described above (steps 110 and 111), and the process proceeds to the automatic heat retention mode (step 112). The hot water filling is completed by confirming that the integrated value of the detected water amount of the water amount sensor 33 has reached the hot water amount calculated as described above and the bathtub water level sensor 24 has reached the set water level.

  If an affirmative determination is made in step 109, a “full water warning” is displayed (step 113), and the automatic operation is terminated (step 114). That is, the automatic operation lamp is turned off, the non-combustion state of the hot water supply burner 4a is maintained, and the closed state of the pouring valve 31 is maintained.

  In this embodiment, as shown in step 109, it is determined whether or not to start the automatic operation based on the amount of condensed water. However, the amount of condensed water is condensed in the drain tank 44 instead of in volume. It may be represented by the water level.

  Further, as described above, the integrated combustion heat amount corresponds to the amount of condensed water generated and stored, and therefore, this integrated combustion heat amount may be used as it is. In this case, an integrated combustion heat quantity Q0 (predetermined combustion heat quantity) corresponding to the amount of condensed water generated at the full water level is obtained in advance, and steps 103 and 108 are omitted. In step 109, Q1 + Q2> Q0? Judgment is made.

  Further, the predetermined amount of condensation L0 and the predetermined amount of combustion heat Q0 are equal to a reference level (full water level in the present embodiment) at which combustion of the hot water supply burner 4a is stopped, but may be lower than the reference level. Further, the reference level may be lowered below the full water level, and the condensate storage capacity in the drain circuit 42 (including the neutralizer 43) upstream of the drain tank 44 or the storage capacity up to the exhaust port 3 may be increased. In view of this, it may be set higher than the full water level.

In the above-described embodiment, various controls are performed by combining the integrated combustion heat amount with the detection level of the drain level detecting means 50. However, the drain level detecting means 50 is omitted, and the integrated combustion heat amount or the condensation converted by this integrated combustion heat amount is used. Control (including combustion stop control and remote control warning display control) may be performed only with the water storage amount (including the drain level). In this case, in the description of all the drain controls described above, the determination as to whether or not the detection level of the drain level detection means 50 is the drain level 1 or 2 is replaced with one of the following determinations.
(1) Judgment whether or not the integrated combustion heat quantity (calculated value) is equal to or greater than the integrated combustion heat quantity (predetermined value) corresponding to the drain levels 1 and 2 above.
(2) Determination of whether or not the condensed water storage amount (calculated value, drain level) obtained by converting the accumulated combustion heat amount is the drain level 1 or 2 or more.

  Further, a plurality of water level electrodes of the drain level detection means 50 may be provided, and information on the drain level (condensation amount storage amount) in the drain tank 44 may be obtained based on the detection level from the drain level detection means 50. This drain level detecting means 50 may be capable of detecting the drain level steplessly.

  Instead of step 114, the hot water pouring valve 31 may be opened while maintaining the non-combustion state of the hot water supply burner 4a. Thereby, the water from the hot water supply circuit 10 is supplied to the bathtub 70. In this case, bathing is possible because a result equal to that of hot water filling can be obtained by supplying water to the bathtub 70 and setting the water level after setting the water level.

  The user operates the drainage by looking at a warning display during hot water supply operation or when the automatic operation switch is turned on. That is, the drain switch 65z is turned on and the bathtub stopper is pulled out. In response to this, the control means 60 can execute the drain drain and pipe cleaning routine 100 of FIG.

  First, it is determined whether or not a bath is waiting (step 121). Here, the bath standby means a state in which control relating to the bath such as automatic operation (including heat insulation), hot water filling, and additional hot water is not executed.

  When an affirmative determination is made in step 121, the switching valve 49 is switched to shut off the suction side of the pump 23 from the bathtub 70 side and communicate with the drain circuit 42 side (step 122), and the drain side solenoid valve 45 is turned on ( Step 123), the pump 23 is turned on (Step 124). As a result, the condensed water in the drain tank 44 is sucked into the pump 23 via the switching valve 49, and passes through the return pipe 21, the heat receiving pipe 9 a of the heat exchanger 9, and the forward pipe 22 from the discharge side of the pump 23. And then discharged to the existing sewer pipe through the outlet of the bathtub 70.

  The switching operation of the switching valve 49 and the ON operation of the drain side solenoid valve 45 mean the opening operation of the valve means in the claims.

  After the draining operation is continued for 1 minute (step 125), it is determined whether or not the bath water flow switch 25 is off (step 126). If an affirmative determination is made here, it is determined that the drain tank 44 has become empty, then the pump 23 is turned off (step 127), the drain side electromagnetic valve 45 is turned off (step 128), and the switching operation of the switching valve 49 is performed. The suction side of the pump 23 is cut off from the drain circuit 42 side and communicated with the bathtub 70 side (step 129). Thereby, the drainage process (drain drainage process) of condensed water is complete | finished.

  The switching operation of the switching valve 49 and the off operation of the drain side solenoid valve 45 mean the closing operation of the valve means in the claims.

  When a negative determination is made in step 126, that is, when a water flow is detected while the pump 23 is driven, it is assumed that condensed water has accumulated in the drain tank 44, and the pump 23 is further driven for one minute (step 130). ). When affirmative determination is made in step 110, that is, in combination with step 125, when it is determined that the pump 23 has been driven for a total of 2 minutes, it is determined that drainage is sufficiently performed even if the drain tank 44 is not empty, The above steps 127 to 129 are executed, and the drainage is finished.

  After drain drainage is performed as described above, the hot water solenoid valve 31 is turned on to flow hot water from the hot water supply pipe 12 through the hot water filling circuit 30 into the memorial circulation circuit 20. The pipe cleaning is executed (step 131). This pipe cleaning is performed until the integrated value of the water amount detected by the water amount sensor 33 reaches a predetermined amount, for example, 5 liters.

In step 131, cleaning water made of hot water having a bath set temperature is supplied by combustion of hot water supply burner 4a, but combustion of hot water supply burner 4a is not executed and cleaning water made of low temperature water is supplied. Good.
Moreover, in this piping washing | cleaning process, the water which is not heated may be supplied initially, and hot water (60 degreeC) may be supplied after that. If drain water (condensed water) is poured with water, the generation of a strange odor can be prevented, and the piping can be sterilized with hot water thereafter.

  After the pipe cleaning, the warning display such as “full water warning” and “full water” is canceled (step 132).

  Further, when the automatic operation switch of the remote controller 65 is turned off during the automatic heat insulation operation, as shown in FIG. 5, the automatic operation is terminated, the automatic display of the remote controller 65 is turned off and the heat insulation display is turned off (step 141). After that, the presence or absence of residual water in the bathtub is determined. That is, the pump 23 is turned on (step 142). Next, it is determined whether or not the bath flow switch 25 is turned on (step 143). If it is determined that the pump is off, the drain 23 and the pipe cleaning routine are executed after the pump 23 is turned off (step 144). Since this drain drain and pipe cleaning control is the same as in FIG.

When it is determined in step 143 that the water flow switch 25 is on, after the pump 23 is turned off (step 145), the bath water level is monitored by the water level sensor 24 to determine whether or not the water level is below the reference water level (step 146). . This detected water level is accurate because air is vented by a prior pump drive. In the present embodiment, the reference water level refers to a water level that is 10 mm higher than the upper end height H0 of the circulation fitting.
And when a user pulls out a bathtub stopper and a bathtub water level becomes below a reference water level, it transfers to the routine 100 of the said drain drainage and piping washing | cleaning.

Control similar to the control in FIG. 5 is executed also when the automatic operation switch 65y is turned off during hot water filling or when the remote control switch 65x is turned off. When the remote control switch 65x is turned off, combustion in the hot water supply burner 4a is not performed at the time of pipe cleaning of the additional circulation circuit 20, and unheated water is provided as cleaning water.
Note that the water level of the water level sensor 24 is constantly monitored with the automatic operation switch off or the remote control switch off, and it is determined that there is no residual water in the bathtub due to this water level drop. Alternatively, the pump 23 may be driven at predetermined time intervals, the presence / absence of remaining bathtub water may be confirmed by the water flow switch 25, drainage drainage, and pipe cleaning may be performed by determining that there is no remaining bathtub water.

  As described above, during the hot water supply operation, the warning “full water warning” is displayed at the drain level 1, the warning “full water” is displayed at the drain level 2, and the hot water supply is stopped (combustion stop of the combustion burner 4a). When the drain level 1 or the drain level 2 is detected, the state of the residual water in the bathtub 70 is checked, and when it is determined that there is no residual water in the bathtub 70, the drain drain and pipe cleaning routine 100 may be executed.

  Next, an embodiment of the present invention will be described with reference to FIG. The hot water supply apparatus of this embodiment is a hot water supply apparatus provided with heating and a memorial function. In this embodiment, the same number is attached | subjected to the structure part corresponding to reference embodiment mentioned above, and the detailed description is abbreviate | omitted.

  The can 1 is partitioned into a hot water supply space 1a and a heating space 1c. In the heating space 1c, a heating burner 4c (other use burner), a main heat exchanger 9 'for sensible heat recovery for heating (other use), and an auxiliary heat exchanger 9 "for latent heat recovery are provided on the hot water supply side. As with the hot water supply side, the branch pipe 5c is connected to the burner 4c, and the branch pipe 5c is provided with a branch electromagnetic valve 6c.

  The heating circulation circuit 80 (another use circuit) includes the heat receiving pipes 9a 'and 9a "of the heat exchangers 9' and 9". As is well known, the heating circulation circuit 80 is provided with an overflow tank 81, a pump 82, and a liquid / liquid heat exchanger 83 (a heat exchanger for remedy). The hot water circulated by the pump 82 is heated by the heat exchangers 9 ′ and 9 ″ and circulates through terminal devices such as various heaters and terminal equipment.

  The memorial circuit 20A passes through the liquid / liquid heat exchanger 83. During combustion, the pumps 23 and 82 are driven while combustion of the heating burner 4c is performed, and the heat of the heating circulation circuit 80 is transmitted to the memory circulation circuit 20A via the liquid / liquid heat exchanger 83, so that the bathtub 70 The hot water is supposed to be heated.

In the present embodiment, the common recovery tray 41A recovers the condensed water falling from the hot water supply side auxiliary heat exchanger 8 and the heating side auxiliary heat exchanger 9 ″.
Since drain drainage, pipe cleaning, remote control display control, and combustion control executed by the control means are the same as those in the above-described reference embodiment, description thereof will be omitted.

  In this embodiment, it is also necessary to take into account the amount of condensed water generated (stored amount) generated in the auxiliary heat exchanger on the heating side. Since the relationship between the accumulated combustion heat amount on the heating side and the amount of condensed water generation differs from that on the hot water supply side, for example, the heat amount obtained by multiplying the accumulated combustion heat amount on the heating side by a coefficient smaller than 1 and the accumulated combustion heat amount on the hot water side It is necessary to add and calculate the amount of condensed water storage.

The present invention is not limited to the above-described embodiment, and various aspects can be made. For example, in the above embodiment, when drain switch 65z is turned on (see FIG. 4), automatic operation switch 65y is turned off, etc., drain drainage and pipe cleaning are performed forcibly, that is, unconditionally without checking the residual water in the bathtub. Also good.
Further, when it is determined that combustion is not performed or combustion is stopped (for example, when an affirmative determination is made at step 109 in FIG. 3 or when it is determined that the drain level is 2 during hot water supply operation), drain drainage is unconditionally or the remaining of the bathtub Drain drainage and pipe cleaning may be performed under conditions such as no water.
When drain draining is forcibly executed unconditionally, it may be notified that the processing operation is being performed by voice display or the like on the remote controller 65.
The warning display on the display unit 65a may be displayed as a voice.

  In the above embodiment, the pump 23 is driven until the drain tank 44 becomes empty at the time of drain drainage. However, the condensate at the lowest level remains in the drain tank 44, and the stored condensate causes the upstream of the drain tank 44. The communication between the air on the side and the downstream side may be blocked. In this case, a water level electrode indicating the lowest level is added to the drain tank 44. The height of the added water level electrode is slightly higher than that of the ground electrode 51. During drain drainage, it is monitored whether or not the water level in the drain tank 44 has reached the minimum water level L in the drive state of the pump 23. And the drive of the pump 23 is continued until the water level of the drain tank 44 reaches the minimum water level, and when the minimum water level is reached, the drain side solenoid valve is turned off and the pump 23 is turned off.

In the above embodiment, the hot water supply device may be a separate two-can two-water channel type.
In the above embodiment, drainage of condensed water may be performed by a pump provided between the switching valve and the drain tank in the drain circuit. Moreover, you may make it perform this drainage by natural fall.
Instead of the neutralizer 43, water from the water supply pipe may be supplied to the drain tank for dilution. Further, neutralization and dilution may not be performed.

4a Hot-water supply burner 4c Heating burner (other-use burner)
7 Main Heat Exchanger for Hot Water Supply 8 Sub Heat Exchanger for Hot Water Supply 9 Heat Exchanger for Remembrance 9 'Main Heat Exchanger for Heating (Main Heat Exchanger for Other Applications)
9 "Sub-heat exchanger for heating (sub-heat exchanger for other uses)
DESCRIPTION OF SYMBOLS 10 Hot water supply circuit 20, 20A Remembrance circulation circuit 23 Pump 24 Water level sensor (water level detection means)
25 Water flow switch 25 (Water flow detection means)
30 Hot water filling circuit 31 Pouring solenoid valve (pouring valve)
40 Condensate drain means 41 Recovery tray 42 Drain circuit 44 Drain tank 45 Drain side solenoid valve (drain valve, valve means)
49 Switching valve (valve means)
50 Drain level detection means 60 Control means 65 Remote controller 65a Display unit (display means)
65y automatic operation switch (automatic operation command means)
65z drain switch (drain drainage command means)
70 Bathtub 80 Heating circuit (other circuit)

Claims (4)

Hot water supply burner, heating burner, hot water supply main heat exchanger and heating main heat exchanger for recovering sensible heat of combustion gas from the hot water supply burner and heating burner, and the main heat exchanger A sub-heat exchanger for heating water and a sub-heat exchanger for heating that respectively recover the latent heat of the combustion gas on the downstream side, a hot-water supply circuit that passes through the main heat exchanger for hot water supply and the sub-heat exchanger for hot water supply, and the main heater for heating Heating circulation circuit passing through the heat exchanger and the auxiliary heat exchanger for heating, a supplementary circulation circuit connected to the bathtub, a pump and a supplementary heat exchanger provided in the supplementary circulation circuit, and the combustion gas Condensate drain means for collecting and draining the condensed water generated by condensing the water in the sub-heat exchanger for hot water supply and the sub-heat exchanger for heating, and the hot water supply burner, the heating burner and the condensed water Control means for controlling the drain means; For example,
The condensed water drain means includes a common drain tank that stores condensed water from the hot water supply auxiliary heat exchanger and the heating auxiliary heat exchanger, and valve means provided on the downstream side of the drain tank,
The control means stores condensate water in the drain tank by closing the valve means, and opens drain means for draining condensate water from the drain tank to the additional circulation circuit by opening the valve means. In the combustion device to be performed,
The control means adds up the accumulated combustion heat amount in the hot water burner after the drain drainage last time and the converted combustion heat amount obtained by multiplying the accumulated combustion heat amount in the heating burner by a coefficient smaller than 1, and adds up the sum. A combustion apparatus characterized by monitoring the storage state of condensed water in the drain tank based on the amount of combustion heat or the amount of condensed water generated corresponding thereto. The downstream end of the drain means is connected to the suction side of the pump in the memory circulation circuit,
The valve means includes a three-way switching valve provided at a connection point between the drain circuit and the recirculation circuit. At the shut-off position of the switching valve, the pump suction side is communicated with the bathtub and shut off from the drain tank. At the communication position of the switching valve, the pump suction side is communicated with the drain tank.
2. The combustion apparatus according to claim 1, wherein, when draining drainage, the pump suction side is communicated with the drain tank and the pump is driven by switching operation of the switching valve.   3. The reheating heat exchanger comprises a liquid / liquid heat exchanger, and the recirculation circuit performs heat exchange with the heating circulation circuit in the liquid / liquid heat exchanger. The combustion apparatus as described in. Furthermore, a hot water filling circuit having an upstream end connected to the hot water supply circuit and a downstream end connected to the recirculation circuit, and a pouring valve provided in the hot water filling circuit,
The control means executes automatic operation in response to an automatic operation command from the automatic operation command means, and in this automatic operation, the bathtub water level is set by burning the hot water supply burner and opening the pouring valve. By executing the hot water filling mode in which hot water from the hot water supply circuit is supplied to the bathtub through the hot water filling circuit until the water level is reached, and after completion of the hot water filling mode, the hot water in the bathtub is circulated by the pump drive to perform the memorial service. The combustion apparatus according to any one of claims 1 to 3, wherein a heat retention mode for maintaining the hot water in the bathtub at a set temperature is executed.

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