JP2009036480A - Combustion device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To surely prevent execution of drainage in a state that hot water or water remains in a bathtub, in a combustion device draining the condensate water generated in a heat exchanger for collecting latent heat, to the bathtub. <P>SOLUTION: A condensate water drain means 40 comprises a collecting tray 41 disposed below a sub-heat exchanger 8 for collecting latent heat and collecting the condensate water falling from the sub-heat exchanger 8, a drain circuit 42 connected between the collecting tray 41 and a reheating circulation circuit 20, and a drain tank 44 disposed in the drain circuit 42. A cock 71 of the bathtub 70 is automatically opened and closed by a cock opening and closing means 72. A control means 60 stores the condensate water in the drain tank 44 by cutting off the drain circuit 42 by the switch valve 49, and discharges the condensate water from the drain tank 44 to the bathtub 70 by communicating the drain circuit 42 with the reheating circulation circuit 20 by switching the switch valve 49. The control means 60 executes the opening motion (bathtub drainage) of the cock opening and closing means 72 and the drainage in interlocking with each other. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a high-efficiency combustion apparatus capable of recovering the latent heat of combustion gas, and more particularly to improvement of drainage 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 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 cleaned 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.
Furthermore, when the drain level detecting means detects a predetermined level (lower than the full water level) of the drain tank, the pump is driven, and when it is confirmed that there is no bathtub water, condensed water may be discharged.
JP 2005-265228 A

  However, like the hot water supply device of Patent Document 1, if drain drainage is forcibly performed when the drain tank is full, condensed water will flow into the bathtub even when hot water remains in the bathtub, and an alarm is generated. However, there is a possibility that the user may take a bath in a tub containing condensed water without noticing it.

  In addition, when draining drainage by detecting or confirming the drainage of the bathtub (no remaining water in the bathtub), it is determined that there is no remaining bathtub water based on the fact that the water flow is not detected by driving the pump of the additional circulation circuit. I do. Therefore, if there is residual water at a level lower than the connection point of the additional circulation circuit to the bathtub (specifically, the circulation fitting), it will be judged that there is no residual water and the condensed water will be drained into the bathtub residual water. There was a possibility that the user would add water and take a bath.

The present invention has been made in order to solve the above-described problems. A hot water supply burner, a main heat exchanger for recovering sensible heat of combustion gas from the hot water supply burner, and combustion on the downstream side of the main heat exchanger A sub heat exchanger that recovers the latent heat of the gas, a hot water supply circuit that passes through the main heat exchanger and the sub heat exchanger, a bathtub hot water supply circuit that supplies hot water from the hot water supply circuit to the bathtub, and moisture in the combustion gas Condensate drain means for collecting and draining the condensed water generated by condensing in the auxiliary heat exchanger, plug opening / closing means for opening and closing the bathtub plug, the hot water supply burner, condensed water drain means, and plug opening / closing Comprising control means for controlling the means;
The condensate drain means is disposed below the auxiliary heat exchanger and collects condensed water dropped from the auxiliary heat exchanger, and an upstream end is connected to the recovery tray, and a downstream end supplies the bath water. A drain circuit connected to the circuit, a drain tank provided in the drain circuit for storing condensed water, and valve means provided on the downstream side of the drain tank in the drain circuit,
The control means stores the condensed water in the drain tank by closing the valve means and shutting off the drain circuit, and opens the valve means to connect the drain circuit to the bathtub hot water supply circuit. In the combustion apparatus that drains the condensed water to the bathtub,
The control means performs the opening operation of the plug opening and closing means when executing the drainage.

According to the said structure, when drain drainage is performed at a predetermined timing, since it accompanies bathtub drainage, a user can be reliably prevented from entering the hot water of the bathtub containing condensed water.
Note that the drainage and the opening / closing operation of the plug opening / closing means may always be linked. Further, when the bathtub tap is opened, drain drainage may be performed only when a predetermined condition, for example, the amount of accumulated condensed water in the drain tank is at a predetermined level.

  Preferably, the control means monitors the amount of condensed water stored in the drain tank, and executes the opening operation of the plug opening / closing means and the drainage when the amount of storage exceeds a predetermined amount. According to this, drainage can be performed at a timing according to the amount of condensed water stored. Monitoring of the amount of condensed water storage may be based on detection information from a drain level detection means provided in the drain tank, or may be based on calculation information of accumulated combustion heat quantity from the previous drain drainage.

  The predetermined amount may be an amount corresponding to the level of full water in the drain tank, or may be lower than this. Especially when drain draining at other timings, setting the full water level can reduce the number of times that the user drains and drains the bathtub forcibly during bathing, and ensures that the drain tank exceeds the full water level. Can be avoided.

  Furthermore, a bathtub drainage command means is provided, and the control means executes the opening operation of the plug opening / closing means and the drain drainage in response to the bathtub drainage command from the bathtub drainage command means. Thereby, when commanding bathtub drainage by a user's intention, drain drainage and bathtub drainage can be performed reliably.

Preferably, the bathtub hot water supply circuit includes a recirculation circuit connected to the bathtub, and a hot water filling circuit having one end connected to the hot water supply circuit and the other end connected to the recirculation circuit. The tension circuit is provided with a pouring valve, the remedy circulation circuit is provided with a heat exchanger for remedy and a pump, the drain circuit is connected to the suction side of the pump in the remedy circulation circuit, In addition, automatic operation command means is provided, and the control means executes automatic operation in response to the automatic operation command from the automatic operation command means. In this automatic operation, the hot water supply burner is burned and the pouring is performed. By opening the valve, 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 bath water level reaches the set water level is executed. Circulate And performing a warming mode for maintaining the hot water in the bathtub at a set temperature by performing a memorial operation, and when the control means receives a command to cancel the automatic operation from the automatic operation command means, the opening / closing means of the plug opening / closing means is opened. Operation and drain drainage are performed.
According to this, bathtub drainage and drainage can be performed at the timing of automatic operation command cancellation.

At the time of canceling the automatic operation command, the control means may unconditionally execute bath drainage and drain drainage, or may give predetermined conditions.
For example, when the condensate storage amount in the drain tank is monitored and an automatic operation release command is received from the automatic operation command unit, the opening and closing operation of the plug opening and closing unit is performed on condition that the storage amount exceeds a predetermined amount. The drainage may be performed. According to this, even if a user cancels | releases an automatic driving | operation, if there is little storage amount of the condensed water of a drain tank, the hot water of a bathtub can be left. In this case, it is preferable that the predetermined amount is smaller than an amount corresponding to the level of full water in the drain tank.

  Preferably, the valve means includes a three-way switching valve provided at a connection point between the drain circuit and the additional circulation circuit, and at the shut-off position of the switch valve, the pump suction side is communicated with the bathtub and shut off from the drain circuit. In the communication position of the switching valve, the pump suction side is communicated with the drain circuit. When draining, the control means communicates the pump suction side with the drain circuit by the switching operation of the switching valve. And the pump is driven. Thereby, the pump of the memory circulation circuit can be used for drainage.

  Preferably, the control means executes drainage after a predetermined time from the opening operation of the plug opening and closing means. Thereby, drain drainage can be performed after bathtub drainage is completed, and dilution and diffusion of condensed water into bathtub hot water can be prevented.

  According to the present invention, when drain drainage is performed, bathtub drainage is always accompanied, so that it is possible to reliably prevent the user from entering the hot water of the bathtub containing condensed water.

  Hereinafter, an integrated two-can two-water channel type hot water supply device (combustion device) with a remedy function according to a first embodiment of the present invention 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 (burner) is arranged in the lower part of the hot water supply space 1a, and a memorial 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 main heat exchanger 7 for recovering sensible heat is disposed above the burner 4a, and a sub heat exchanger 8 for recovering latent heat is further disposed above (downstream side). 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. In the present embodiment, the bath circulation circuit 20 and the hot water filling circuit 30 constitute a bathtub hot water supply circuit 75 defined in the scope of claims.

  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 on the upstream side of the bypass pipe 13, and the hot water temperature is provided on the downstream side 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 (water level detecting means), and a water flow switch 25 (water flow detecting means).
A drain port is formed in the bottom wall of the bathtub 70, and a plug 71 that closes the drain port is automatically opened and closed by a plug opening / closing means 72.

  One 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 is connected to the suction side (upstream side) of the pump 23 in the return pipe 21. 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 (upstream end) is connected to the bottom of the collection tray 41, and the other end (downstream 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 liters. 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. 8, the remote controller 65 has 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). A bathtub drain switch 65z (tub drain command means), a temperature setting unit for setting the temperature of the hot water supply and the bathtub, a water level setting unit for setting the bathtub water level (all not shown), a set temperature, a set water level, a warning, etc. Is provided with a display unit 65a (display means).

  The operation of the hot water supply apparatus having the above configuration will be described. First, the basic operation will be schematically 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. 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 automatic operation switch 65y is turned on, the control means 60 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, whereby hot water having a set temperature is supplied from the hot water supply pipe 12 to the hot water filling circuit 30 and the additional circulation. 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.

Next, the control by the control means 60 which characterizes the present invention will be described in detail.
When the user turns on the bathtub drain switch 65z, the control shown in FIG. 3 is executed. First, the stopper opening / closing means 72 is controlled to open the stopper 71 of the bathtub 70 (step 101). Thereby, drainage of hot water or water from the bathtub 70 is started.

  Next, it waits for a predetermined time (for example, 5 minutes) to elapse (step 102). It waits for the drainage of the hot water in the bathtub 70 to be completed.

Next, 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 103), the drain side solenoid valve 45 is turned on (step 104), and the pump 23 is turned on (step 105).
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 106), it is determined whether or not the bath water flow switch 25 is off (step 107). If an affirmative determination is made here, it is determined that the drain tank 44 has become empty, and then the pump 23 is turned off (step 108), the drain side electromagnetic valve 45 is turned off (step 109), 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 110). 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 107, 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 111). ). When affirmative determination is made in step 111, that is, in combination with step 105, 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 108 to 110 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 112). 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. After the pipe cleaning, the warning display of “full water warning” described later is canceled (step 112).

In step 112, cleaning water made of hot water having a bath setting temperature is supplied by combustion of hot water supply burner 4a. 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.

  Further, when the automatic operation switch 65y of the remote controller 65 is turned off during the automatic heat insulation operation, as shown in FIG. 4, 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). Thereafter, the stopper opening / closing means 72 is controlled to open the stopper 71 of the bathtub 70 (step 142). Thereby, drainage of hot water or water from the bathtub 70 is started. Next, after waiting for elapse of a predetermined time (for example, 5 minutes) (step 143), a drain drainage and piping cleaning routine is executed. Since this drain drain and pipe cleaning control is the same as in FIG.

  In the control of FIG. 4, before executing step 142, it is determined whether or not the detection level of the drain level detection means 50 exceeds level 1, and if so, the bathtub drainage, drainage drainage, piping The cleaning may be executed, and if not exceeded, these controls may not be executed.

  The control similar to the control in FIG. 4 is also executed 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 cleaning the piping of the additional circulation circuit 20, and unheated water is provided as cleaning water.

  As shown in FIG. 5, the control means 60 always adjusts the drain level of the drain tank 44 based on the information of the stepped level detection (drain levels 1 and 2) of the drain level detection means 50 (for example, at predetermined time intervals). Monitor. First, it is determined whether or not the drain level is level 1 or higher (whether or not the drain level has reached the water level electrode 53) (step 151). If the determination is affirmative, a warning message “full water warning” is displayed on the display unit 65a of the remote controller 65 (step 152).

  Next, it is determined whether or not the drain level is level 2 or higher (whether or not the drain level has reached the water level electrode 52) (step 153). When an affirmative determination is made here, the stopper opening / closing means 72 is controlled to open the stopper 71 of the bathtub 70 (step 154). Thereby, drainage of hot water or water from the bathtub 70 is started. Next, after waiting for elapse of a predetermined time (for example, 5 minutes) (step 155), the drain drain and pipe cleaning routine 100 is executed.

Even if it is determined that the level is 1 during the hot water supply operation, the combustion of the hot water supply burner 4a is continued, but when it is determined that the level is 2 or higher, the combustion (hot water supply) of the hot water supply burner 4a is stopped. As a result, condensed water is not generated and the drain level does not increase.
Similarly, hot water filling is continued even if it is determined that the level is 1 during hot water filling, but when it is determined that the level is 2 or higher, combustion of the hot water supply burner 4a is stopped and the pouring valve 31 is closed.
In addition, at the drain level 2 during the hot water supply operation, the bathtub drainage operation and the drain drainage may be performed while continuing the combustion (hot water supply).

In the said embodiment, you may additionally set the timing of bathtub drainage and drain drainage. For example, there are the following timings.
(1) The drain level of the drain tank 44 exceeds level 1 when the automatic operation switch is on.
(2) A case where a predetermined time has elapsed since the last drain drain when the remote control switch 65x is on.
(3) Time set by the user in one day.

  Next, a second embodiment of the present invention will be described with reference to FIG. The hot water supply apparatus according to the second embodiment is a hot water supply apparatus provided with heating and a memorial function. In this embodiment, components corresponding to those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is 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". The heating circulation circuit 80 is provided with an overflow tank 81, a pump 82, and a liquid / liquid heat exchanger 83 as is well known. 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 auxiliary heat exchanger 83, and the bathtub 70 hot water is heated.

  In the present embodiment, the hot water supply circuit 75A of the claims is constituted by the memory circulation circuit 20A and the hot water filling circuit 30.

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 latent heat exchanger 9 ″.
The bathtub drainage, drain drainage, pipe cleaning, and combustion control executed by the control means 60 are the same as those in the first embodiment, and thus the description thereof is omitted.

  Next, a third embodiment of the present invention will be described with reference to FIG. The hot water supply apparatus according to the third embodiment is a single hot water supply type. In this embodiment, components corresponding to those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the present embodiment, one hot water supply circuit 90 is provided instead of the memory circulation circuit. The upstream end of the hot water supply circuit 90 is connected to the downstream end of the drain circuit 42 at the connection point P <b> 2 ′, and the downstream end is connected to the bathtub 70. In the middle of the hot water supply circuit 90, the pump 23 and the water level sensor 24 are provided in order toward the downstream side, and a switching valve 49 is provided at the connection point P2 '.

  The hot water supply circuit 90 and the hot water filling circuit 30 constitute the bathtub hot water supply circuit 95 of the present invention. The hot water filling circuit 30 is branched at the downstream end, one branch passage 30a is connected to the switching valve 49, and the other branch passage 30b is connected to the hot water supply circuit 90 (the connection point is indicated by reference symbol P1 ′). ).

In this embodiment, bathtub drainage detection is performed only by the information of the water level sensor 24. The hot water is supplied to the bathtub 70 by opening the hot water solenoid valve 31. That is, hot water from the hot water supply circuit 10 is supplied to the bathtub 70 via the hot water filling circuit 30 and the hot water supply circuit 90.
The switching valve 49 communicates the suction side of the pump 23 to the branch passage 30a of the hot water filling circuit 30 when the condensed water is not drained, and communicates the suction side of the pump 23 to the drain circuit 42 when draining the condensed water. . Since other operations and control are the same as those in the first embodiment, description thereof will be omitted.
In the above embodiment, one of the branch paths 30a and 30b may be omitted.

  The present invention is not limited to the above-described embodiment, and various aspects can be made. For example, in the above-described embodiment, the control unit 60 has obtained information on the amount of condensate stored in the drain tank 44 from the drain level detection unit 50. However, the control unit 60 omits the drain level detection unit 50 and integrates from the previous drain drainage. The amount of condensed water stored may be monitored by the amount of combustion heat. This accumulated combustion heat amount corresponds to the amount of condensed water generated in the auxiliary heat exchanger 8 and, as a result, substantially corresponds to the amount of condensed water accumulated in the drain tank 44.

  In the above-described embodiment, the pump 23 is driven until the drain tank 44 becomes empty at the time of drain drainage. 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 of 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 first and second embodiments, the hot water supply device may be a separate two-can two-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.

It is a circuit block diagram of the hot water supply apparatus with a memorial function which makes 1st Embodiment of this invention. It is a figure which shows the principal part of the remote control of the embodiment. It is a flowchart which shows the control performed when the bathtub drain switch is turned on in the embodiment. It is a flowchart which shows the control performed when an automatic driving | operation switch is turned off during automatic driving | operation in the same embodiment. 3 is a flowchart showing drain level monitoring and control associated therewith during hot water supply operation or the like in the embodiment. It is a circuit block diagram of the hot-water supply apparatus with the heating and the chase function which makes 2nd Embodiment of this invention. It is a circuit block diagram of the hot water supply single type hot water supply apparatus which makes 3rd Embodiment of this invention.

Explanation of symbols

4a Hot water supply burner 7 Main heat exchanger 8 Sub heat exchanger 9 Reheating heat exchanger 10 Hot water supply circuit 20, 20A Reheating circulation circuit 23 Pump 30 Hot water filling circuit 31 Hot water solenoid valve (pour 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 Bathtub drain switch (tub drainage command means)
70 Bathtub 71 Plug 72 Plug opening and closing means 75, 75A Bathtub hot water supply circuit 80 Heating circulation circuit (other application circuit)
90 Hot water supply circuit 95 Bathtub hot water supply circuit

Claims (9)

A hot water supply burner, a main heat exchanger that recovers sensible heat of the combustion gas from the hot water supply burner, a sub heat exchanger that recovers latent heat of the combustion gas downstream of the main heat exchanger, and these main heats A hot water supply circuit that passes through the exchanger and the auxiliary heat exchanger, a bathtub hot water supply circuit that supplies hot water from the hot water supply circuit to the bathtub, and condensed water generated by condensing moisture in the combustion gas in the auxiliary heat exchanger A condensate drain means for collecting and draining, a plug opening and closing means for opening and closing the stopper of the bathtub, and a control means for controlling the hot water supply burner, the condensed water drain means and the plug opening and closing means,
The condensate drain means is disposed below the auxiliary heat exchanger and collects condensed water dropped from the auxiliary heat exchanger, and an upstream end is connected to the recovery tray, and a downstream end supplies the bath water. A drain circuit connected to the circuit, a drain tank provided in the drain circuit for storing condensed water, and valve means provided on the downstream side of the drain tank in the drain circuit,
The control means stores the condensed water in the drain tank by closing the valve means and shutting off the drain circuit, and opens the valve means to connect the drain circuit to the bathtub hot water supply circuit. In the combustion apparatus that drains the condensed water to the bathtub,
The said control means performs the opening operation | movement of the said plug opening / closing means when performing the said drain drainage, The combustion apparatus characterized by the above-mentioned.   The control means monitors the amount of condensed water stored in the drain tank, and executes the opening operation of the plug opening and closing means and the drainage when the amount of storage exceeds a predetermined amount. The combustion apparatus as described in.   The combustion apparatus according to claim 2, wherein the predetermined amount is an amount corresponding to a level of full water in the drain tank.   Furthermore, it comprises a bathtub drainage command means, and the control means executes the opening operation of the plug opening and closing means and the drain drainage in response to the bathtub drainage command from the bathtub drainage command means. 4. The combustion apparatus according to any one of 3. The bathtub hot water supply circuit is composed of a recirculation circuit connected to the bathtub and a hot water circuit having one end connected to the hot water supply circuit and the other end connected to the hot water circulation circuit. Is provided with a pouring valve, a heat exchanger for reheating and a pump are provided in the recirculation circuit, and the drain circuit is connected to the suction side of the pump in the recirculation circuit,
In addition, automatic operation command means is provided, and the control means executes automatic operation in response to the automatic operation command from the automatic operation command means. In this automatic operation, the hot water supply burner is burned and the pouring is performed. By opening the valve, 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 bath water level reaches the set water level is executed. Execute the heat retention mode to maintain the hot water in the bathtub at the set temperature by circulating
The said control means performs the opening operation | movement of the said plug opening / closing means and the said drain drainage, when the instruction | command of automatic driving | operation cancellation | release is received from the said automatic driving | operation instruction | command means. Combustion equipment.   The control means monitors the amount of condensate stored in the drain tank, and when the automatic operation command means receives a command to cancel the automatic operation, the controller opens the plug opening and closing means on the condition that the stored quantity exceeds a predetermined amount. 6. The combustion apparatus according to claim 5, wherein an opening operation and the drainage are performed.   The combustion apparatus according to claim 6, wherein the predetermined amount is less than an amount corresponding to a level of full water in the drain tank. The valve means includes a three-way switching valve provided at the 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 circuit. In the valve communication position, the pump suction side is connected to the drain circuit.
8. The control device according to claim 5, wherein, when draining the drain, the pump suction side is communicated with the drain circuit by the switching operation of the switching valve and the pump is driven. 9. Combustion equipment.   9. The combustion apparatus according to claim 1, wherein the control means executes drain drainage after a predetermined time from the opening operation of the plug opening / closing means.

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