JP4672159B2 - Remaining hot water supply system - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an apparatus for feeding remaining hot water in a bathtub to a washing machine.
[0002]
[Prior art]
The technology for chasing the hot water in the bathtub is widespread, and the hot water in the bathtub is sucked into the automatic hot water supply device between the automatic hot water supply device and the bathtub, and reheated in the automatic hot water supply device. The piping which sends back to the bathtub is provided. For this purpose, a side wall of the bathtub is provided with a port for feeding hot water to the automatic water heater (a suction port) and a port for receiving hot water from the automatic water heater (a supply port). A pump that circulates is installed.
2. Description of the Related Art A remaining hot water supply device is known that uses an automatic hot water supply device to supply remaining hot water in a bathtub to a washing machine. In this technique, the remaining hot water in the bathtub is sucked into the automatic hot water supply device using the suction port for reheating, and the remaining hot water sucked out by the automatic hot water supply device is fed to the washing machine water inlet.
[0003]
[Problems to be solved by the invention]
In the conventional remaining hot water supply device, the suction port provided on the side wall of the bathtub is used both when chasing the hot water in the bathtub and when supplying the remaining hot water in the bathtub to the washing machine. For this reason, if the remaining hot water level is lower than the suction port, the remaining hot water cannot be fed to the washing machine. That is, only a part of the remaining hot water in the bathtub can be used as washing water, and the remaining hot water that cannot be used has to be drained, which is wasted.
[0004]
This invention is made | formed in order to solve this problem, and makes it a subject to provide the technique which can utilize all the remaining hot water in a bathtub as washing water.
[0005]
[Means for solving the problem, operation and effect]
The remaining hot water supply device of the present invention is connected to a suction port provided in a side portion of the bathtub, a supply port provided in the side portion of the bathtub, a circulation path for circulating the remaining hot water in the bathtub, and a circulation A pump provided in the path, a drain plug provided at the bottom of the bathtub and draining the remaining hot water in the bathtub to the drain when opened, and a stop valve provided in the drain downstream of the drain plug And a first water passage having one end communicating with the drainage passage between the drain plug and the stop valve and the other end communicating with the circulation passage between the suction port and the pump, and circulation between the pump and the supply port. It is provided at the second water supply path where one end communicates with the path and the other end communicates with the washing machine water inlet, and at the location where the second water supply path communicates with the circulation path, and supplies hot water from the pump to the supply port. A switching valve that switches between a state of 1 and a second state of sending hot water from the pump to the washing machine inlet, and a bath Of the time of water the remaining water into the washing machine, opening the discharge valve to close the water stop valve, switching the switching valve to the second state, and a controller for operating the pump.
In the remaining hot water supply apparatus configured as described above, when the drain valve is opened by the controller, the water stop valve is closed, the switching valve is switched to the second state, and the pump is operated, Hot water is sucked out from two places, a drain plug and a suction port, and sent to the water injection port of the washing machine. A large amount of remaining hot water can be sent to the washing machine in a short time. Moreover, since the drain plug is provided in the bottom part of the bathtub, all the remaining hot water in the bathtub can be sent to the washing machine.
[0006]
In the case of this water supply device, it is preferable that the controller has a program for stopping the pump when the washing machine water inlet is closed.
In this case, since the pump is stopped when the washing machine is full and the washing machine water inlet is closed, waste that the pump continues to operate after the washing machine is full is prevented.
[0007]
It is also preferable that the controller has a program for opening the water stop valve when the washing machine water inlet is closed.
In this case, the water stop valve is automatically opened when the washing machine is full and the washing machine inlet is closed. For this reason, when the remaining hot water is sent to the washing machine, the remaining hot water in the bathtub is automatically drained.
[0008]
Provided in a second drainage channel with one end communicating with the second waterway and with the other end communicating with the drainage channel downstream from the stop valve, and at a location where the second drainage channel communicates with the second waterway. And a second switching valve that switches between a first state in which hot water from the pump is sent to the washing machine water inlet and a second state in which hot water from the pump is sent to the second drainage channel. And the controller opens the drain valve and the water stop valve during rapid drainage , switches the switching valve to the second state, switches the second switching valve to the second state, and It is preferable to provide a program for operating .
In this case, at the time of rapid drainage, in addition to draining the remaining hot water in the bathtub through the water stop valve, the remaining hot water is also drained from the second drainage channel. For this reason, the remaining hot water in the bathtub can be drained rapidly.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The remaining hot water supply device of the present invention can be suitably implemented in the form shown below.
(Mode 1) In the automatic hot water supply apparatus according to claim 1, the pipe connecting the bathtub and the washing machine allows the bathtub and the washing machine to communicate with each other through the hot water heater and the pouring unit.
(Mode 2) A third drainage channel branches off from a pipe connecting the suction port of the bathtub and the automatic water heater, and a third drainage plug is provided in the third drainage channel. Sometimes we have a program to open the third drain valve.
By making it the structure which drains also from a suction outlet, the remaining hot water in a bathtub can be drained further rapidly.
[0010]
【Example】
An embodiment of the remaining hot water feeding device according to the present invention will be described.
First, the configuration of the automatic water heater 10 will be described with reference to FIG. The automatic water heater 10 includes a hot water heater 11, a pouring unit 12, a controller 14, a drain plug 22, a water stop valve 24, and the like, and piping and hoses that communicate these components. FIG. 1 illustrates a state in which the automatic water heater 10 is placed in a “standby state” (described later).
The water heater 11 includes a gas combustor, a heat exchanger, a pump, and the like (not shown). The water heater 11 includes a water supply port 11a connected to the water pipe 27, a hot water outlet 11b for pouring hot water into the hot water pipe 28, and hot water (or remaining hot water) in the bathtub 26 as a suction pipe 32 and a drain pipe 76 (patented) A suction port 11c that sucks in via a third water distribution channel (referred to in claims) and a return port 11d that discharges hot water (or remaining hot water) sucked from the suction port 11c to the return pipe 33 are provided. The tap water supplied to the water supply port 11a is warmed by a gas combustor and a heat exchanger (not shown) and discharged to the hot water pipe 28. The hot water discharged from the hot water pipe 28 is supplied to a bathroom, a kitchen faucet, a shower, and the like. The pump sucks out hot water from the bathtub 26, is reheated by a gas combustor and a heat exchanger as necessary, and then feeds water from the return port 11d.
[0011]
The tap water branched from the water pipe 27 is supplied to the water inlet 42 of the pouring unit 12. An inlet filter 43 is attached to the water inlet 42, and when the tap water contains dust, the dust is captured here. A governor 41 is attached downstream of the water inlet 42. The governor 41 operates to close when the pressure difference between the upstream and downstream exceeds a predetermined value, and has a function of limiting the flow rate. Further, a water amount valve 44 is mounted downstream of the governor 41. The water amount valve 44 is a servo valve of a type in which a stepping motor rotates to adjust the opening degree of the valve.
The hot water discharged from the water heater 11 to the hot water pipe 28 is supplied to a faucet or the like of the bathroom, and is also branched off and supplied to the hot water inlet 45 of the pouring unit 12. A check valve 46 for preventing a back flow from the pouring unit 12 to the water heater 11 is attached to the hot water inlet 45. A hot water on / off valve 47 that is driven by a solenoid and opens and closes the flow of hot water is mounted downstream of the hot water inlet 45.
[0012]
The passage downstream of the water amount valve 44 and the hot water on-off valve 47 merges, and a check valve 48 for preventing backflow is mounted downstream of the junction. The downstream of the check valve 48 is branched, and a water flow sensor 52 for detecting whether or not there is a water flow is attached to one of the branched passages. The water flow sensor 52 is “ON” when there is a water flow, and “OFF” when there is no water flow. A temperature sensor 53 is inserted and attached to a passage downstream of the water flow sensor 52. The temperature sensor 53 detects the temperature by using a thermistor characteristic whose resistance changes depending on the temperature.
A switching valve B54 is mounted downstream of the temperature sensor 53. The switching valve B54 switches whether the water flowing from the temperature sensor 53 is flown to the washing machine 62 side or the drainage side. A washing machine water injection valve 56 for switching between water injection and stoppage of the washing machine 62 is mounted downstream of the flow path on the washing machine 62 side of the switching valve B54. The washing machine water injection valve 56 is a component part of the washing machine 62. The drain side of the switching valve B54 is connected to a water distribution pipe downstream of the water stop valve 24 (described later) via a drain pipe 69.
[0013]
On the other hand, the return pipe 33 connected to the return port 11d of the water heater 11 communicates with the switching valve A66. The switching valve A66 switches whether hot water (or remaining hot water) flows from the water heater 11 to the washing machine 62 side or to the bathtub 26 side. A filter 65 that traps dust contained in the remaining hot water is attached downstream of the branch of the switching valve A66 toward the washing machine 62, and a remaining hot water on-off valve 67 is attached further downstream. The remaining hot water on-off valve 67 is driven by a solenoid to open and close the circulation of the remaining hot water. The downstream of the remaining hot water on / off valve 67 joins the downstream of the above-described check valve 48. Moreover, the branch to the bathtub 26 side of the switching valve A66 is connected with the supply port 26a formed in the bathtub.
[0014]
One end of the suction pipe 32 is connected to the suction port 26 b formed in the bathtub 26, and the other end communicates with the suction port 11 c of the water heater 11. In the middle of the suction pipe 32, a bathtub suction closing valve 74 is mounted. The bathtub suction shut-off valve 74 opens in a state where water is flowing, but closes when air is sucked, that is, when the pressure difference between the upstream and downstream of the valve becomes small, and prevents the suction of air.
A drain plug 22 is provided at the bottom of the bathtub 26, a drain pipe 72 is connected downstream of the drain plug 22, and a water stop valve 24 is mounted downstream of the drain pipe 72. The drain plug 22 and the water stop valve 24 are both driven by solenoids and have a function of opening and closing the flow of water. As described above, the drainage pipe 69 communicating with the switching valve B54 is connected downstream of the water stop valve 24.
One end of the drain pipe 76 is connected to the middle of the drain pipe 72, and the other end is connected to the suction pipe 32. A drain suction stop valve 77 is mounted in the middle of the drain pipe 76. This drain suction closing valve 77 is. It has the same internal configuration as the bathtub suction stop valve 74 described above, and is provided for the purpose of preventing air suction.
[0015]
The controller 14 includes the water heater 11 and the components of the pouring unit 12 (water volume valve 44, hot water on / off valve 47, remaining hot water on / off valve 67, water flow sensor 52, switching valve A66, switching valve B54, temperature sensor 53), drain valve 22 and the water stop valve 24 are connected via a signal line (in FIG. 1 to FIG. 10, the signal line is indicated by a chain line). The controller 14 includes a CPU, a RAM, a ROM, an input processing circuit, an output processing circuit, and a BUS that transmits information between them. The controller 14 processes an input signal according to a predetermined program and outputs it as a control signal. This control signal controls the pouring unit 12 and the like connected to the controller 14.
A remote controller 16 is connected to the controller 14 via a signal line. The remote controller 16 is for the user to operate the selection switch to remotely operate the pouring unit 12, the drain plug 22, etc., and can select various operation modes of the automatic hot water supply apparatus 10. As operation modes related to water supply to the washing machine 62, “remaining hot water mode” in which the remaining hot water in the bathtub 26 is supplied, “hot water mode” in which the tap water is heated by the water heater 11 to supply hot water, There is a “water mode” in which tap water is sent as is. As other modes, there are a “water filling mode”, a “chasing mode”, a “drainage mode”, a “rapid drainage mode”, and the like. In consideration of the convenience of the user, the remote controller 14 may be arranged, for example, with functions distributed or overlapped in two places, a bathroom and a kitchen.
[0016]
Next, operations in each operation mode of the automatic water heater 10 will be described with reference to FIGS. In addition, although the automatic hot water supply apparatus 10 has a function to perform various operations, in the following description, operations relating to reuse and drainage of remaining hot water in the bathtub according to the present invention will be described, and other operations ( Since the hot water filling mode and the like are not different from the generally known operation, the description thereof is omitted.
[0017]
(Standby Mode) FIG. 1 shows an automatic hot water supply apparatus in which water (remaining hot water) is put in the bathtub 26, the washing machine water injection valve 56 is closed, and the selection switch of the remote controller 16 is in the remaining hot water mode (standby state). FIG. 10 is a system diagram of ten. In this standby state, the water amount valve 44 is opened, and the hot water on / off valve 47 and the remaining hot water on / off valve 67 are closed. The switching valve B54 and the switching valve A66 have their flow paths switched to the washing machine 62 side and the bathtub 26 side, respectively. The drain plug 22 is closed and the water stop valve 24 is opened. The water pipe 27 is applied with water pressure.
[0018]
(Remaining hot water mode) When the washing machine water injection valve 56 is opened in the standby mode shown in FIG. 1, a flow path from the water pipe 27 to the washing machine 62 is formed as shown in FIG. Then, water flows through this flow path, and the water flow sensor 52 is turned on. When the water flow sensor 52 is turned on, the automatic water heater 10 determines that the washing machine water injection valve 56 is opened (in FIG. 2 to FIG. Shown).
When the water flow sensor 52 is turned on, as shown in FIG. 3, the water amount valve 44 is closed, the switching valve A66 switches the flow path to the filter 65 side, and the remaining hot water on / off valve 67 is opened. Further, the drain plug 22 is opened, the water stop valve 24 is closed, and the pump of the water heater 11 starts operating. In this state, since the water stop valve 24 is closed, all of the remaining hot water discharged from the drain plug 22 is sucked out from the branch portion of the drain pipe 72 by the pump of the water heater 11, and the switching valve A 66 and the remaining hot water are opened and closed. Water is fed to the washing machine 62 via the valve 67, the switching valve B54 and the like. Since the check valve 48 is mounted, the remaining hot water does not flow back to the water amount valve 44 or the hot water on / off valve 47 side. Further, the remaining hot water in the bathtub 26 is also sucked out from the suction port 26 b of the bathtub 26 and is sent to the washing machine 62. The filter 65 captures dust contained in the remaining hot water sent to the washing machine 62. In this state, the bathtub suction stop valve 74 and the drain suction stop valve 77 are opened by the suction pressure of the pump of the water heater 11 to circulate the remaining hot water. In this way, the remaining hot water that has entered the bathtub 26 is sucked out from the two locations of the drain plug 22 and the suction port 26b, so that a large amount of remaining hot water is sent to the washing machine 62 in a short time.
[0019]
Further, when the water supply to the washing machine 62 is continued, the surface of the remaining hot water in the bathtub 26 is lowered and becomes lower than the suction port 26b. This state is shown in FIG. When the water level becomes lower than the suction port 26b, the suction port 26b sucks air, so the pressure difference between the upstream and downstream of the bathtub suction shut-off valve 74 becomes small, and this is detected and the bathtub suction shut-off valve 74 is closed. . Even if the water surface of the bathtub 26 becomes lower than the suction port 26b, the remaining hot water is sucked from the drain plug 22 provided at the bottom of the bathtub 26, and the water supply to the washing machine 62 is continued. That is, since the automatic hot water supply apparatus 10 configured in this manner sucks the remaining hot water from the drain plug 22, all the remaining hot water in the bathtub 26 can be used.
[0020]
When the washing machine water injection valve 56 is closed or all the remaining hot water in the bathtub 26 is fed, the remaining hot water does not flow through the hot water pouring unit 12 and the water flow sensor 52 is turned off. When the water flow sensor 52 is turned off, the pump of the water heater 11 is stopped, the water amount valve 44 is opened, the remaining hot water on-off valve 67 is closed, and the switching valve A66 is switched to the bathtub 26 side.
When the water flow sensor 52 is turned off for a predetermined time (for example, 3 minutes), it is determined that the water supply to the washing machine 62 has ended, and the remaining hot water on-off valve 67 is opened. When the remaining hot water on / off valve 67 is opened, as shown in FIG. 5, the water flows through the filter 65 in the direction of the bathtub 26, and is captured by the filter 65 when the water in the bathtub 26 is fed to the washing machine 62. The trash is washed away. The remaining hot water on-off valve 67 is closed when a predetermined time (for example, 15 seconds) elapses, and the washing of dust from the filter 65 is finished. When the water flow sensor 52 is turned on within a predetermined time, that is, when the washing machine water injection valve 56 is opened, the washing of the dust from the filter 65 is not performed, and the water supply to the washing machine 62 is not performed. Resumed.
[0021]
(Hot water mode) When the selection switch of the remote controller 16 is operated to the hot water mode, the remaining hot water on / off valve 67 is closed and the hot water on / off valve 47 is opened. When the washing machine water injection valve 56 is opened in this state, as shown in FIG. 6, a flow path from the hot water outlet 11b of the water heater 11 to the washing machine 62 is formed, and water flows through this flow path, The water flow sensor 52 is turned on. When the water flow sensor 52 is turned on, the gas combustor of the water heater 11 is activated, and water supplied from the water pipe 27 to the water supply port 11 a of the water heater 11 is warmed and supplied to the hot water inlet 45 of the hot water pouring unit 12. Hot water supplied to the hot water inlet 45 flows through the hot water on-off valve 47. Further, water is supplied from the water pipe 27 to the water inlet 42 of the pouring unit 12, and after passing through the governor 41 and the water amount valve 44, it is mixed with the hot water flowing through the hot water on / off valve 47. The governor 41 limits the flow rate so that the water from the water pipe 27 does not exceed a predetermined flow rate (so as not to flow too much). The temperature sensor 53 detects the temperature after the hot water from the hot water on-off valve 47 and the water from the water amount valve 44 are mixed, and transmits the detected temperature to the controller 14. The controller 14 sends a control signal to the flow valve 44 so as to reach a predetermined temperature (for example, 38 ° C.) set in advance. The opening degree of the water amount valve 44 is adjusted by this control signal, the temperature after mixing the water flowing through the water amount valve 44 and the hot water flowing through the hot water on / off valve 47 is controlled to a predetermined temperature, and the water is fed to the washing machine 62. When the washing machine water injection valve 56 is closed, the water flow sensor 52 is turned off, whereby the operation of the gas combustor of the water heater 11 is stopped.
[0022]
(Water mode) When the water mode is selected, as shown in FIG. 7, the water amount valve 44 is opened, and the hot water on / off valve 47 and the remaining hot water on / off valve 67 are closed. When the washing machine water injection valve 56 is opened in this state, a flow path from the water pipe 27 to the washing machine 62 is formed, and water is supplied to the washing machine 62.
[0023]
(Turning Mode) The chasing mode is selected when the hot water in the bathtub 26 has cooled down and it is desired to warm it again. When the reheating mode is selected, as shown in FIG. 8, the flow path of the switching valve A66 is switched to the bathtub 26 side, and the gas combustor and the pump of the water heater 11 are operated. When the pump of the water heater 11 is activated, the remaining hot water in the bathtub 26 is sucked out from the suction port 26b and sent to the water heater 11. The remaining hot water sent to the water heater 11 is warmed by the gas combustor, returned to the bathtub 26 side, and flows into the bathtub 26 from the supply port 26a. In this way, the hot water in the bathtub 26 is chased away.
[0024]
(Drainage mode) When the drainage mode is selected, the drain plug 22 and the water stop valve 24 are opened as shown in FIG. When the drain plug 22 and the water stop valve 24 are opened, the remaining hot water in the bathtub 26 is drained to the outside of the bathtub 26.
[0025]
(Rapid drainage mode) The rapid drainage mode is selected when it is desired to drain the remaining hot water contained in the bathtub 26 quickly. When the rapid drainage mode is selected, as shown in FIG. 10, the switching valve A66 switches the flow path to the filter 65 side, and the switching valve B54 switches the flow path to the drainage side. Moreover, the drain plug 22 and the water stop valve 24 are opened, and the pump of the water heater 11 is operated. The remaining hot water in the bathtub 26 flows through the drain plug 22 and the water stop valve 24 and is discharged. Further, the hot water in the bathtub 26 is sucked into the pump of the water heater 11 and the remaining hot water in the bathtub 26 is also sucked in from the suction port 26 b of the bathtub 26 and the branch portion of the drain pipe 72. The remaining hot water sucked in is drained downstream of the water stop valve 24 through the hot water heater 11 and the hot water pouring unit 12. In addition, the bathtub suction closing valve 74 and the drainage suction closing valve 77 are opened by the suction pressure of the pump of the water heater 11 to circulate the remaining hot water. Even if the surface of the remaining hot water in the bathtub 26 becomes lower than the suction port 26 b, the remaining hot water is drained from the branch portion of the water stop valve 24 and the drain pipe 72. When all the remaining hot water in the bathtub 26 is drained, the water flow sensor 52 does not detect the water flow and is turned off. When the water flow sensor 52 is turned off, the pump of the water heater 11 is stopped and the drainage is finished. Thus, in the rapid drainage mode, the remaining hot water in the bathtub 26 is discharged simultaneously from three places (two places after the water surface in the bathtub 26 becomes lower than the suction port 26b), so the drainage time is shortened. can do.
[0026]
Next, a procedure for supplying water from the bathtub 26 (remaining hot water) to the washing machine 62 and discharging water to the outside will be described with reference to the flowchart of FIG.
When the remaining water mode is selected by the remote controller 16 in a state where water is put in the bathtub 26 (S12), and the washing machine water injection valve 56 is subsequently opened (S14), the process proceeds to S16. In S16, the drain plug 22 is opened, the water stop valve 24 is closed, the pump of the water heater 11 is operated, the switching valve B54 is switched to the washing machine 62 side, and the remaining hot water in the bathtub 26 is supplied to the washing machine 62. Is done. Thereafter, when the washing machine water injection valve 56 is closed, the water supply to the washing machine 62 is stopped (S18). In the subsequent S20, the user selects whether to drain the remaining hot water in the bathtub 26 as it is, or to return to the remaining hot water mode and supply water to the washing machine 62 again. When the drainage mode is selected, the drain plug 22 and the water stop valve 24 are opened, and the remaining hot water in the bathtub 26 is drained to the outside. And drainage is complete | finished (S24). On the other hand, when the remaining hot water mode is selected in S20, the process returns to the process immediately before S14, and when the washing machine water injection valve 56 is opened again, water is supplied from the bathtub 26 to the washing machine 62.
Note that the selection of whether to drain the remaining hot water in the bathtub or to send the remaining hot water to the washing machine again, as described in S20 above, is omitted, and automatically when the washing machine water injection valve 56 is closed. The remaining hot water in the bathtub may be drained. When the washing machine water injection valve 56 is closed in this manner, if the remaining hot water in the bathtub 26 is drained, drainage from the bathtub is reliably performed (preventing forgetting drainage).
[0027]
When the “drainage mode” is selected (S32), the process proceeds to the process of S22 as it is, and the drain plug 22 and the water stop valve 24 are opened and the water put in the bathtub 26 is drained.
When the “rapid drainage mode” is selected (S42), the drain plug 22 and the water stop valve 24 are opened, the pump of the water heater 11 is operated, the switching valve B54 is switched to the drain side, and the water in the bathtub 26 is drained. The water is rapidly drained (S44), and the drainage is finished (S24).
[0028]
Although the automatic hot water supply apparatus according to the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment, and the present invention is subjected to various changes and improvements based on the knowledge of those skilled in the art. Can be implemented. For example, you may comprise as described below.
[0029]
(1) The drainage via the switching valve B54 does not necessarily have to be drained downstream of the water stop valve 24, and may be drained to the outside from other portions.
[0030]
(2) It is good also as a structure which attaches a pump separately in addition to the pump incorporated in the water heater 11, and this pump supplies the water to the washing machine 62, or drains the bathtub.
If comprised in this way, water supply and drainage can be performed more efficiently.
[Brief description of the drawings]
FIG. 1 is a system diagram (standby state) showing the operation of an automatic water heater of an embodiment.
[Fig. 2] Same as above (in a standby state, immediately after the washing water tap is opened)
[Fig. 3] Same as above (remaining hot water mode, where the water surface of the bathtub is above the suction port)
[Fig. 4] Same as above (Remaining hot water mode, where the water surface of the bathtub is below the suction port)
[Fig. 5] Same as above (in a state in which filter dust is washed away)
[Fig. 6] Same as above (hot water mode)
Fig. 7 (Water mode)
[Fig. 8] Same as above (Casting mode)
[Figure 9] Same as above (drainage mode)
[Figure 10] Same as above (Rapid drainage mode)
FIG. 11 is a follow chart showing a processing procedure of water supply and drainage from the bathtub of the automatic water heater of the embodiment.
DESCRIPTION OF SYMBOLS 10: Automatic hot water supply apparatus 11: Water heater, 11a: Water supply port, 11b: Outlet port, 11c: Suction port, 11d: Return port 12: Pouring unit 14: Controller 16: Remote control 22: Drain plug 24: Stop valve 26 : Bath, 26a: Supply port, 26b: Suction port 27: Water pipe 28: Hot water pipe 32: Suction pipe 33: Return pipe 41: Governor 42: Water inlet 43: Inlet filter 44: Water quantity valve 45: Hot water inlet 46: Check Valve 47: Hot water on-off valve 48: Check valve 52: Water flow sensor 53: Temperature sensor 54: Switching valve B
56: Washing machine water injection valve 62: Washing machine 65: Filter 66: Switching valve A
67: Remaining hot water on-off valve 69: Drain pipe 72: Drain pipe 74: Bathtub suction stop valve 76: Drain pipe 77: Drain suction stop valve

Claims (4)

A suction port provided on the side of the bathtub and a supply port provided on the side of the bathtub, and a circulation path for circulating the remaining hot water in the bathtub;
A pump provided in the circulation path;
A drain plug provided at the bottom of the bathtub and draining the remaining hot water in the bathtub to the drain when opened,
A stop valve provided in the drainage channel downstream of the drain plug,
A first water supply path having one end communicating with the drainage path between the drain plug and the stop valve and the other end communicating with the circulation path between the suction port and the pump;
A second water passage having one end communicating with the circulation path between the pump and the supply port and the other end communicating with the washing machine water inlet;
Between the first state where hot water from the pump is sent to the supply port and the second state where hot water from the pump is sent to the washing machine water inlet, the second water passage is connected to the circulation path. A switching valve that switches, and
A remaining hot water supply apparatus having a controller that opens a drain plug, closes a water stop valve, switches a switching valve to a second state, and operates a pump when the remaining hot water in the bathtub is supplied to the washing machine.   The remaining hot water supply apparatus according to claim 1, wherein the controller has a program for stopping the pump when the washing machine water inlet is closed.   The remaining hot water supply device according to claim 1 or 2, wherein the controller has a program for opening the water stop valve when the washing machine water inlet is closed. A second drainage channel having one end communicating with the second water supply channel and the other channel communicating with the drainage channel downstream of the water stop valve;
The second drainage channel is provided at a location where the second drainage channel communicates with the second water supply channel, and a first state in which hot water from the pump is sent to the washing machine water inlet, and hot water from the pump is supplied to the second drainage water. A second switching valve that switches between a second state to be sent to the road,
A program for opening the drain plug and the stop valve, switching the switching valve to the second state, switching the second switching valve to the second state, and operating the pump during rapid drainage; The remaining hot-water supply apparatus in any one of Claim 1 to 3 which has.

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