JPH0337113B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention provides a system for circulating hot water in a bathtub by operating a bathtub and supplying hot water directly to the bathtub by operating a water heater. Regarding the bath equipment, in detail, the hot water supply system connects the bathtub and the bath pot through a forced circulation path with a circulation pump, heats tap water, and supplies the hot water produced by the heating at tap pressure. The present invention relates to a bath device in which a vessel is connected to a lower part of the bathtub via a hot water supply path provided with a vacuum break valve at a higher location than the bathtub.

[Conventional technology]

Conventionally, in the above bath equipment, both the bath pot and the water heater were operated to efficiently fill the bathtub with hot water at an appropriate temperature (in winter, when the temperature of the tap water was low and the water heater's capacity was insufficient) (necessary in times of stress, etc.), connect the hot water supply line from the water heater directly to the forced circulation line that connects the bathtub and the bathtub.
By reheating the hot water from the water heater in the bathtub and then supplying it to the bathtub, you can use the hot water heater without waiting for the hot water to accumulate in the bathtub to a level higher than the bathtub side suction port of the agreed circulation system. From the beginning of operation, the bathtub was made to be able to operate simultaneously, allowing both the water heater and the bathtub to be operated to fill the bathtub with hot water at the appropriate temperature more quickly and with high efficiency (for example, -Refer to Publication No. 202253).

[Problem that the invention seeks to solve]

However, in the type where the hot water supply line from the water heater is directly connected to the forced circulation line for the bathtub, the vacuum breaker valve attached to the hot water supply line and the circulation pump installed in the forced circulation line are connected to the pipe system. Because it is connected directly, there is a risk that the pump pressure of the circulation pump may have an adverse effect on the vacuum breaker valve, causing trouble in its operation. Although various shutoff valve devices such as check valves and solenoid valves are installed to switch flow paths and prevent backflow, vacuum breaker valves are sometimes required due to operational troubles caused by pump pressure. Because the system did not operate properly, there was a risk that hot water from the bathtub would backflow into the water supply, which could lead to a serious contamination accident.

In other words, a vacuum breaker valve attached to the hot water supply path from the water heater at a location higher than the bathtub automatically opens the hot water supply path to the atmosphere when negative pressure is generated in the hot water supply path due to a water outage, etc. This prevents the backflow of hot water from the bathtub to the water supply side due to the siphon phenomenon caused by the generation of negative pressure. Compared to this, it is more reliable to prevent backflow when negative pressure is generated, so by installing this vacuum breaker valve in the hot water supply line, it is possible to directly connect the water supply system to the bottom of the bathtub (in the order of water supply, water heater, hot water supply line, and bathtub). However, if the vacuum breaker valve is at risk of causing operational trouble due to the influence of the pump pressure as mentioned above, it is difficult to maintain the high reliability that the vacuum breaker valve inherently has. The reality was that it was not possible to make full use of it, and it was not possible to ensure sufficient safety in terms of hygiene.

An object of the present invention is to make it possible to operate the bathtub at the same time from the start of operation of the water heater, while not impairing the backflow prevention function of the vacuum breaker valve, through rational improvements to the pipe configuration. It is in.

[Means for solving problems]

The characteristic configuration of the bath device according to the present invention is that the bathtub and the bath pot are connected by a forced circulation path equipped with a circulation pump, and that the bath water is heated and the hot water produced by the heating is supplied at tap pressure. In a configuration in which a water heater is connected to a lower part of the bathtub via a hot water supply path provided with a vacuum break valve at a higher place than the bathtub, the hot water supply is carried out inside the bathtub or in a restricted space communicating therewith. The hot water supplied from the water heater is connected to the outlet of the channel and the bathtub-side suction port of the forced circulation channel through the cooperation of the supply pressure from the water heater and the suction pressure of the circulation pump. The reason is that they are arranged opposite to the bathtub-side suction port so as to be delivered in a fountain-like manner, and their functions and effects are as follows.

[Effect]

In other words, when the water heater and bath pot are operated at the same time, the hot water supplied from the hot water supply tank is delivered in a fountain flow from the outlet of the hot water supply path to the bathtub side suction port of the forced circulation path, and then the delivered hot water is forcedly circulated. After supplying the water to the bath pot through the suction side pipe and reheating it in the bath pot,
It is supplied to the bathtub via the discharge side pipe of the forced circulation path.

Therefore, without waiting for hot water to accumulate in the bathtub itself to a level higher than the bathtub-side suction port of the forced circulation path, hot water is directly supplied from the water heater to the bath kettle from the beginning of operation of the water heater. can be operated at the same time.

In addition, to prevent backflow using a vacuum breaker valve, an atmospheric release system is installed between the outlet of the hot water supply path and the bathtub-side suction port of the forced circulation path, which are opposed to each other inside the bathtub or in a restricted space communicating therewith. Because it intervenes,
The pump pressure of the circulation pump installed in the forced circulation path does not affect the vacuum breaker valve attached to the hot water supply path at all, and the vacuum breaker valve is installed in the hot water supply path that directly communicates with the bathtub. It is said that it will be attached to
The vacuum breaker valve can function under the most appropriate installation conditions for the vacuum breaker valve, and the highly reliable backflow prevention function inherent in the vacuum breaker valve can be fully utilized.

〔Effect of the invention〕

As a result of the above, while providing extremely high safety against contamination accidents such as backflow of bath water to the water supply side,
A convenient and easy-to-use product that can quickly and efficiently fill the bathtub with hot water at the appropriate temperature by operating both the water heater and the bath pot, by simultaneously operating the bath pot from the time the water heater starts operating. Can be made into a good bath device.

Although it is an additional matter, it is possible to operate both the water heater and the bath pot without waiting for the hot water to accumulate in the bathtub to a level higher than the bathtub-side suction port of the forced circulation furnace, and to operate the bathtub hot water on the water supply side. If the only goal is to reliably prevent backflow to the bathtub 4, as shown in FIG. It is also conceivable to connect to the forced circulation path 8A on the bathtub 7 side through the bathtub, but in that case, the water pressure is used as the pressure for supplying hot water and the water is sent from the water heater to the bathtub without using a separate hot water pump etc. If hot water were to be forcibly fed, it would be necessary to place the intermediate tank T at a much higher location than the bathtub 4 in order to secure a static water head (same as the so-called cistern tank type), and for this reason, the pipe The channel equipment becomes larger (the figure shows a three-way switching valve for switching the flow channel).

On this point, the model that attaches the vacuum breaker valve to the water supply line from the water heater can prevent backflow and utilize the water pressure as described above, as long as the vacuum breaker valve is placed a little higher than the highest water level in the bathtub. Therefore, the bath device according to the present invention has the inherent advantage of being able to make the pipe equipment more compact.Therefore, the bath device according to the present invention has “extremely high reliability in preventing the backflow of bath water, while also being able to In addition to the above-mentioned characteristic effect of ``allowing us to perform hot water filling at the appropriate temperature with high efficiency by operating the bath kettle from our facility,'' we also have a vacuum breaker valve that allows us to use water pressure as the hot water supply pressure with compact pipe equipment. It also has advantages due to its type, and as a whole, it is a highly practical bath device that is excellent in terms of hygiene, safety, ease of use, ease of installation, construction workability, and equipment cost.

In addition, as a device having the same function as the bath device of the present invention, a reservoir for receiving hot water supplied from a water heater is provided in the bathtub, and the bathtub-side suction port of the forced circulation path is opened to the reservoir. When operating the bathtub and the bathtub at the same time, the hot water supplied from the water heater is temporarily received in a reservoir attached to the bathtub, and the received hot water is supplied to the bathtub via the suction side pipe of the forced circulation path. A model was previously proposed (Japanese Patent Application No. 130416/1983) in which the water was reheated in the bathtub and then supplied to the bathtub via the discharge side pipe of the forced circulation path.
Compared to that, the present invention has the advantage that no reservoir structure is required and the structure attached to the bathtub is compact.

〔Example〕

Next, embodiments of the present invention will be described based on the drawings.

Figure 1 shows the overall configuration of the bath equipment.
is a water heater that heats water supplied from a water supply channel 2 connected to a water supply and supplies the heated water with water pressure, and its main component is a Finch-Ube type water heating heat exchanger 1A. , and a gas burner 1B therefor.

A hot water supply path 3 from the water heater 1 includes a hot water supply path 3A for the bath connected to the lower part of the bathtub 4 and a hot water tap 5 for general hot water supply.
It is branched from the general hot water supply path 3B that connects to the
A water heater 1 is used to supply hot water to a bathtub 4 and for general hot water supply.

The hot water supply path 3A for the bath is connected to the bathtub 4 on the way.
The pipes are installed at a higher place than the above, and the highest part of the pipe is equipped with a system that automatically closes the pipe at the highest point when negative pressure occurs in the pipe due to a water outage, etc. A vacuum breaker valve 6 that opens to the atmosphere is installed, and the automatic atmosphere release function of the vacuum breaker valve 6 reliably prevents unexpected backflow of bath water to the water supply side due to a siphon phenomenon caused by the generation of negative pressure. In this way, hygiene and safety are ensured.

7 in the figure is a bathtub whose main components include a finch tube type water heating heat exchanger 7A and a gas burner 7B for it, and the bathtub 7 and bathtub 4 are connected to a suction side circulation path 8A and a discharge side circulation path. 8B, and a circulation pump 9 is interposed in the suction side circulation path 8A.

The connection structure between the bath water supply path 3A and the circulation furnaces 8A and 8B to the bathtub 4 is such that a through hole is formed in the lower part of the bathtub wall, and the bath water supply path 3A and the circulation furnace 8B are connected to the tube furnace connector 10 attached to the through hole. Each of the circulation paths 8A and 8B is centrally connected.

Regarding the specific structure of the pipe connector 10, as shown in FIGS. 2 to 4, there are an upper hole a and a lower hole b.
10A of connecting members formed vertically in a parallel position.
is attached to the outside of the bathtub wall with its upper hole a and lower hole b facing the inside of the bathtub through the through hole in the bathtub wall, and the bath water supply path 3A and the blowing side circulation path 8 are installed.
A is connected to the connecting member 10A so as to communicate with the upper hole a, and the discharge side circulation path 8B is connected with the lower hole b.

Discharge port c of hot water supply path 3A for bath and suction side circulation path 8
The suction port d of A means that the hot water discharged from the bath hot water supply path 3A is connected to the supply pressure (water pressure) of the water heater 1 and the circulation pump 9.
are arranged opposite to each other in a horizontal direction orthogonal to the hole axis of the upper hole a so that the suction pressure is delivered to the suction side circulation path 8A inside the upper hole a, in cooperation with the suction pressure of
When both the water heater 1 and the bath pot 7 are operated to fill the bathtub 4 with hot water at an appropriate temperature, the hot water supply form to the bathtub 4 is as shown in FIG. 5A.
The hot water supplied from the water heater 1 is delivered to the suction side circulation path 8A inside the upper hole a, and after the delivered hot water is further heated in the bath pot 7, it is sent from the lower hole b to the bathtub via the discharge side circulation path 8B. It is designed to be discharged and supplied to 4.

In other words, by supplying hot water from the water heater 1 to the bath pot 7 by transferring hot water inside the upper hole a, after the water heater 1 starts operating, the bath pot 7
The bathtub 7 can be operated in parallel from the start of operation of the water heater 1 without having to wait for hot water to accumulate in the bathtub 4 itself to a water level at which circulating water can be supplied to the bathtub. Both the water heater 1 and the bath pot 7 are operated to efficiently fill the water at an appropriate temperature.

In addition, when supplying hot water from the water heater 1 to the bath pot 7,
Between the bath hot water supply path 3A equipped with the vacuum break valve 6 and the suction side circulation path 8A equipped with the circulation pump 9,
The circulation pump 9
This is to prevent the pump pressure from having an adverse effect on the vacuum breaker valve 6, which may cause operational trouble.

In addition, when operating only the water heater 1 to fill hot water into the bathtub 4, since the circulation pump 9 is stopped in that case, as shown in FIG. Hot water supplied from the water heater 3A into the hole a is directly discharged and supplied to the bathtub 4 from the upper hole a.

In addition, the bathtub water circulation mode when only the bathtub pot 7 is operated to circulate and heat the bathtub water is as shown in FIG. The hot water heated in the bath pot 7 is discharged from the lower hole b to the bathtub 4 via the discharge side circulation path 8B.

Regarding the ancillary structure of the pipe connector 10, the inner part of the upper hole a is used as a hole for attaching a bathtub water level sensor 11, which will be described later.

Further, on the inside side of the bathtub 4, a swirler 10B and an elbow member 10C provided with a bathtub water attraction hole e are connected to the upper hole a and the lower hole b, respectively, so that the upper hole a or the lower hole b is connected to the elbow member 10C. The discharged hot water is swirled by the action of the swirling blades 10B, and as the hot water is swirled, the hot water is sufficiently mixed with the drawn bath water through the bathtub water induction hole e and is discharged into the bathtub 4.

In addition, when only the bath pot 7 is operated to circulate and heat the bath water, the elbow member 10C connected to the upper hole a
The internal flow path serves as the bathtub water suction path.

The cosmetic cover 10D is formed with a porous opening f for introducing bathtub water into the bathtub water induction hole e of each elbow member 10C, and from the porous opening f, both bathtub water induction holes e are formed. A space for installing a bathtub water temperature sensor 12, which will be described later, is provided in the bathtub water flow path leading to the bathtub water flow path.

On the other hand, regarding the operation control of this bath device, a control device 13 that automatically controls the water heater 1 and the bath pot 7
is installed to automatically increase the water in the bathtub to the set water level.
In addition, an automatic hot water filling mode that automatically raises the temperature to a set temperature, a reheating mode that circulates and heats the bath water to raise the temperature, and a general hot water supply mode that supplies hot water at the set temperature to the hot water tap 5. The control device 13 is configured to execute the following.

The remote controller 14 that gives operation commands to the control device 13 is equipped with various operating tools such as a mode switching tool that also serves as a start/stop tool for each mode, a hot water temperature setting tool, etc., and also controls the operation of each part. It is equipped with display devices to display the status and setting status of various values.

As for the automatic valves, in the hot water supply path 3, a water flow regulating valve 15 is installed upstream of the branch point between the hot water supply path 3A for the bath and the hot water supply path 3B for the general use, and
In addition, in the fuel gas supply path 17 for the water heater 1 and the bath pot 7, a gas amount adjustment valve 18 for adjusting both heating and heating is installed for the gas burner 1B of the water heater 1. For the gas burner 7B of No. 7, a gas valve 19 for intermittent gas supply is provided;
A source gas valve 20 is installed on the upstream side of the branch point between the water heater side and the bathtub side.

In addition, as sensors, a water flow sensor 21 and an inlet water temperature sensor 22 are installed in the water supply channel 2, and a hot water temperature sensor 23 is installed in the hot water supply channel 3 on the upstream side of the branch point between the bath pot hot water supply channel 3A and the general hot water supply channel 3B. , due to the generation of water flow in the general hot water supply path 3B due to the opening of the hot water tap 5.
The first water flow switch 24 to be turned on is turned on when a water flow is generated in the discharge side circulation path 8B due to the drive of the circulation pump 9.
The bathtub 4 is equipped with a second water flow switch 25, and a bathtub water level sensor 11 and a bathtub water temperature sensor 12 housed in the pipe connector 10 as described above.

The bathtub water level sensor 11 specifically detects the static head pressure of the bathtub water, and the bathtub water level is continuously read by the control device 13 based on the detection of the static head pressure.

Next, the execution form of each mode by the control device 13 will be listed.

A Automatic hot water filling mode When the automatic hot water filling mode is started, the hot water filling valve 16 is opened and the water flow sensor 21 is opened.
Based on the detection of the start of water supply, the source gas valve 20 and the gas amount adjustment valve 18 are opened, and the gas burner 1B of the water heater 1 is automatically ignited.

The water amount adjustment valve 15 is normally fixed in a state in which the water supply amount v per unit time is maintained at the maximum rated water supply amount vmax for this bath device.

The water level Hp and temperature tp of the bathtub water facing the user set by the water level setting device and the hot water temperature setting device, the water level Hx and temperature tx of the remaining water in the bathtub detected by the bathtub water level sensor 11 and the bathtub water temperature sensor 12,
In addition, for the inlet water temperature ti detected by the inlet water temperature sensor 22, the required heating amount q per unit time is expressed by the following formula (a) q = (Hp・tp−Hx・tx/Hp−Hx−ti)・vmax − Calculated by (a).

Then, the rated heating amount qa・max of water heater 1,
The rated heating amount qb・max of the bath pot 7, and the rated heating amount qmax (=qa・max+qb・max) of the bath equipment as a whole, which is the sum of these rated heating amounts.
The calculated required heating amount q is compared with the calculated required heating amount q, and as a result of the comparison, () The calculated required heating amount q is the rated heating of the water heater 1.
When less than qa・max (q≦qa・max),
While the bathtub 7 and the circulation pump 9 are maintained in a stopped state, the heating amount qa of the water heater 1 per unit time is adjusted to the calculated required heating amount q by automatic adjustment to the gas amount adjustment valve 18, and then, With the water supply amount v fixed at the rated water supply amount vmax, the water heater 1 is operated independently to start filling the bathtub 4 with hot water in the hot water supply form as shown in FIG. 5B.

() When the calculated required heating amount q is larger than the rated heating amount qa・max of water heater 1 and less than the rated heating amount qmax of the entire bath equipment (qa・max<q≦qmax(=qa・max+qb・
max)), the circulation pump 9 is started following the ignition of the gas burner 1B on the water heater side, and the gas valve 19 is opened based on the turning on of the second water flow switch 25 accompanying the start of the circulation pump 9. , the gas burner 7B of the bathtub 7 is automatically ignited.

Also, by opening the gas valve 19, which is an ON-OFF valve, the bath pot 7 reaches its rated heating amount qb・max.
The rated heating amount qb・max of bath pot 7 and the heating amount qa of water heater 1
The sum is the calculated required heating amount q (qb・
max + qa = q), the heating amount of water heater 1
qa is adjusted by automatic adjustment to the gas amount adjustment valve 18, and then both the water heater 1 and the bath pot 7 are operated with the water supply amount v fixed at the rated water supply amount vmax to produce hot water as shown in Fig. 5A. Filling the bathtub 4 with hot water is started in the supply mode.

In other words, the above equation (A) not only fills the bathtub 4 with hot water from a state where there is no remaining water (H _x = 0), but also
Even when filling the bathtub 4 with water remaining, the water supply time required to increase the bathtub water to the set water level Hp by supplying water at the rated water supply amount vmax and to raise the temperature to the set temperature tp. This is a conditional expression that makes the heating time equal to are started at the same time, and the heating amount q (the sum of the heating amount qa of the water heater 1 and the heating amount qb of the bath pot 7) per unit time for the bath equipment as a whole is set to a value that satisfies the above formula (a). By adjusting
The time required from the start of hot water filling to the completion of hot water filling is minimized.

() When the calculated required heating amount q is larger than the rated heating amount qmax of the entire bath equipment (q>
At qmax (=qa・max+qb・max)), as in the case () above, following the ignition of the gas burner 1B on the water heater side, the circulation pump 9 is started and the gas valve 19 is opened to open the bathtub. 7 gas burner 7B is automatically ignited.

In addition, bath pot 7 has its rated heating amount qb・max
In addition to heating operation with water heater 1
The heating qa of the water heater 1 is adjusted by automatic adjustment to the gas amount adjustment valve 18 so that the water heater 1 is heated with its rated heating amount qa・max,
Further, while feeding back the water amount detected by the water amount sensor 21, the amount of water supplied per unit time v is automatically adjusted to the water amount adjustment valve 15 to obtain the following formula (c) 1/v=(Hp・tp−Hx・tx/Hp−Hx− ti)・1/qmax −(c).
Fixed at qmax (=qa・max+qb・max),
Then, with the water supply amount v being throttled and adjusted, both the water heater 1 and the bath pot 7 are operated to start filling the bathtub 4 with hot water in the hot water supply form as shown in FIG. 5A.

In other words, in the case of (), in winter, because the inlet water temperature ti is quite low, or there is a large amount of low-temperature water remaining in the bathtub 4, automatic hot water filling in the form of () described above cannot be performed. This is a case where the heating capacity of the bath equipment is insufficient, but the above-mentioned equation (C) applies not only to filling the bathtub 4 with hot water from a state where there is no remaining water (Hx = 0), but also when there is water remaining in the bathtub 4. Even when filling hot water from
This is a conditional expression that equalizes the heating time required to raise the temperature to the set temperature tp by heating at (qb・max) and the water supply time. Water supply and heating are started simultaneously with the heating amount q fixed at the rated heating amount qmax,
And the water supply amount v per unit time is
By adjusting equation (c) to a value that satisfies the requirement, if the heating capacity is insufficient, the time required from the start of hot water filling to the completion of hot water filling can be shortened as much as possible depending on the situation.

Even after automatic hot water filling is started in any of the above methods (), (), (), the water level of the bathtub water remains unchanged.
HX, temperature tx, and water inlet temperature ti are continuously detected, and the required heating amount q is calculated sequentially using the above-mentioned equation (A) based on the detected values during the filling process.

Then, at any point during hot water filling, () When the calculated required heating amount q is less than the rated heating amount qa・max of the water heater 1 (q≦qa・max)
In this case, the heating amount qa of the water heater 1 is readjusted to the calculated required heating amount q after adopting the same hot water filling configuration as in () above, and () the calculated required heating amount q is the rated heating amount of the water heater 1. When it is larger than qa・max and less than the rated heating amount qmax of the entire bath equipment (qa・max<q≦qmax(=qa・max+qb・
max)), the rated heating amount qb・
The heating amount qa of the water heater 1 is readjusted so that the sum of max and the heating amount qa of the water heater 1 becomes the calculated required heating amount q (qb・max+qa=q), and () the calculated required heating amount q is When the rated heating amount qmax of the bath equipment as a whole is larger (q＞
For qa・max+qb・max), the same water filling configuration as in () above is adopted, and the water supply amount v is expressed by the above equation (c) for the detected values Hx, tx, and ti at the intermediate point in time. The water is readjusted to a satisfactory value, and automatic filling continues as such readjustments are carried out one after another.

In other words, both equations (a) and (c) above are based on the water level.
Since it is a functional expression related to Hx, there is no particular problem in the case of a bathtub shape where the cross-sectional area of the bathtub water storage part is always equal to the bottom area, but the cross-sectional area of the bathtub water storage part becomes larger as the height of the bathtub increases. In the case of a bathtub shape that changes depending on the transverse height, it is not possible to adjust the heating amount and water supply amount based on formula (a) or (c) only at the start of filling. As the process progresses, a control error occurs due to a change in cross-sectional area, and as a result, the automatic filling completion state deviates from the desired filling completion state previously set by the user.

Also, if the remaining water Hx at the start of automatic hot water filling is lower than the installation height of the bathtub water level sensor 11 and the remaining water cannot be detected at the time of automatic hot water filling, the method (A) or (C) may be used. If only the heating amount adjustment and the water supply amount adjustment based on the above are executed at the start of hot water filling, the completion state of automatic hot water filling may not reach the desired state due to control errors caused by missing bottom water level residual water detection at the time of starting automatic hot water filling. It deviates from the state.

Therefore, as mentioned above, by sequentially executing readjustments based on formula (a) or (c) during automatic hot water filling, changes in the cross-sectional area of the bathtub and low water level residual water at the start of automatic hot water filling can be avoided. The control error caused by the detection is corrected so that the state of completion of automatic hot water filling matches the desired state with good accuracy.

In addition, the equations used as standards for adjusting the heating amount and water supply amount are given by the functional equations (a) and (c) regarding the water level Hx, and
The control error caused by this is expressed by the function equations (a) and (c).
By re-adjusting the water during filling based on the
The control structure can be used in common for both bathtubs 4, and changes in the specifications of the bathtub 4 can be easily dealt with both in terms of production and cost.

Regarding the completion of automatic hot water filling, when the water level Hx of the bathtub water reaches the set water level Hp after successive readjustments during hot water filling, the gas amount adjustment valve 18 is closed based on the bathtub water level detection by the bathtub water level sensor 11. At the same time, the hot water filling valve 16 is closed and the operation of the water heater 1 is stopped.

When filling the water up to the set water level Hp is finally completed with independent operation of the water heater 1, the bathtub water temperature tx detected by the bathtub water temperature sensor 12 is detected at the time when the water heater operation is stopped based on the water level detection.
If the water heater 1 has not yet reached the set temperature tp, the circulation pump 9 and the bathtub 7 are started to operate after the water heater 1 is stopped, and the operation continues until the detected bathtub water temperature tx reaches the set temperature tp. Continued.

In addition, if the filling of hot water to the set water level Hp is finally completed with the operation of both the water heater 1 and the bath pot 7, the detected bathtub water temperature at the time when the water heater operation is stopped based on the water level detection. If tx has reached the set temperature tp, the circulation pump 9 is stopped, and the second water flow switch 25 is turned OFF as the circulation pump is stopped, and the gas valve 19 and the source gas valve 20 are closed to close the bath. The operation of pot 7 is also done by water heater 1.
However, if the detected bathtub water temperature tx at the time of stopping the water heater based on water level detection has not reached the set temperature tp, the detected bathtub water temperature tx will remain at the set temperature tp even after the water heater 1 stops operating. The circulation pump 9 and the bathtub 7 continue to operate until the end.

In other words, by starting water supply and heating at the same time, and adjusting the amount of heating and water supply based on formula (a) or formula (c) above, the water increase to the set water level Hp and the temperature increase to the set temperature tp are completed at the same time. However, due to heat dissipation during filling, a situation may occur where the bathtub water temperature tx still does not reach the set temperature tp even though the bathtub water level Hx has reached the set water level Hp. Therefore, the insufficient temperature rise caused by heat radiation is automatically compensated for by operating the bathtub after the water heater has stopped operating as described above.

After the water heater operation is stopped based on water level detection, when the bathtub water temperature tx reaches the set temperature tp, the remote controller 14 notifies and displays the completion of hot water filling.

When the bathtub water level Hx reaches the set water level Hp, water heater 1
operation is stopped, and the bathtub water temperature tx is the set temperature.
Even after the operation of the circulation pump 9 and bath boiler 7 is stopped at tp, unless the automatic hot water filling mode is stopped on the remote controller 14 side, the bath water temperature tx will be changed every set period of about 10 minutes, for example. is executed, and if the difference between the detected bathtub water temperature tx and the set temperature tp exceeds a set allowable value of, for example, about 1°C, the circulation pump 9 and bath pot 7 are automatically restarted. The operation continues until the detected bathtub water temperature tx returns to the set temperature tp.

B Reheating mode When the reheating mode is started, the circulation pump 9 is started, and the source gas valve 20 and gas valve 19 are opened based on the turning on of the second water flow switch 25 accompanying the start of the circulation pump. Then, the gas burner 7B of the bath pot 7 is automatically ignited, and the bath pot 7 is then heated in the bathtub water circulation mode as shown in FIG.
Circulation and heating of the bathtub water by the operation starts.

However, at this time, if the bathtub water level Hx is insufficient and has not reached the pipe connector 10, the second water flow switch 25 is activated even by driving the circulation pump 9.
Since the bath pot 7 is not turned on, it is not operated, thereby preventing so-called dry heating.

Furthermore, even if the second water flow switch 25 is turned on by driving the circulation pump 9, the bathtub water temperature sensor 12
When the detected bathtub water temperature tx exceeds a set upper limit temperature set to, for example, 50°C, the operation of the bathtub 7 is automatically stopped, thereby preventing overboiling. .

When the reheating mode is stopped, the circulation pump 9 is stopped, and the second water flow switch 25 is turned OFF due to the circulation pump being stopped, and the gas valve 19 and the main gas valve 20 are closed, and the bath pot is turned off. 7 is stopped.

C General hot water supply mode When the hot water tap 5 is opened, the main gas valve 20 and the gas amount adjustment valve 18 are opened based on the ON of the first water flow switch 24, and the gas burner 1B of the water heater 1 is automatically ignited. Ru.

Also, for general hot water supply, hot water at a set temperature tr is generated based on the temperature tr set by the user with a temperature setting tool, the inlet water temperature ti detected by the inlet water temperature sensor 22, and the water supply amount v detected by the water flow sensor 21. The amount of heating q' required to obtain the required heating amount is calculated, and the amount of heating qa of the water heater 1 is adjusted to the calculated required amount of heating q' by automatic adjustment to the gas amount adjustment valve 18. Based on this, the gas flow regulating valve 1 is also operated to maintain the detected hot water temperature trx at the set temperature tr.
The heating amount of water heater 1 is automatically adjusted to 8.
After the qa is finely adjusted, hot water is supplied to the tap 5 while the hot water temperature is stabilized by so-called feed-forward, AND, and feedback control.

When the tap 5 is closed, the main gas valve 20 is turned off based on the OFF of the first water flow switch 24.
Then, the gas amount adjustment valve 18 is closed and the operation of the water heater 1 is stopped.

Furthermore, what is the general hot water supply mode and reheating mode?
Since this is a mode in which the water heater 1 is operated independently and the bathtub pot 7 is operated independently, simultaneous parallel execution is possible.

Further, when the hot water tap 5 is opened during execution of the automatic hot water filling mode, general hot water supply is performed in a form in which a part of the hot water supplied from the water heater 1 to the bathtub 4 is diverted and supplied to the hot water tap 5 side. However, at this time, if the automatic hot water filling mode is being executed with both water heater 1 and bath pot 7 operating, there is a possibility that the amount of hot water supplied from water heater 1 to bath pot 7 will be insufficient. For this reason, the operation of the circulation pump 9 and the bathtub 7 is temporarily stopped based on the turning on of the first water flow switch 24 until the hot water tap 5 is closed.

[Another example]

Next, another embodiment of the present invention will be described.

Instead of arranging the discharge port c of the hot water supply path 3A and the bathtub-side suction port d of the forced circulation path 8A to face each other through a restricted space (upper hole a) communicating with the inside of the bathtub 4 as in the previous embodiment, FIG. They may be placed opposite each other inside the bathtub 4 as shown in FIG.

In addition, in FIG. 6, 26 in the figure is a decorative cover.

The facing direction between the discharge port c of the hot water supply path 3A and the bathtub-side suction port d of the forced circulation path 8A may be horizontal, vertical, or inclined as appropriate.

The operation control mode for the water heater 1, the bathtub 7, and the circulation pump 9, as well as the control structure thereof, can be changed in various configurations, and are not limited to the operation control mode disclosed in the above embodiment.

The vacuum breaker valve 6 attached to the hot water supply path 3A from the water heater 1 can be of various conventionally known types.

[Brief explanation of the drawing]

1 to 5 show embodiments of the present invention,
Fig. 1 is an overall configuration diagram, Fig. 2 is an enlarged sectional view of the conduit connector, Fig. 3 is a sectional view taken along the - line in Fig. 2, Fig. 4 is a schematic perspective view of the conduit connector, and Fig. 5 A, B, and C are diagrams showing hot water supply forms, respectively.
FIG. 6 is a partially omitted enlarged view showing another embodiment of the present invention. FIG. 7 is a configuration diagram showing a comparative example. 1... Water heater, 3A... Hot water supply path, 4... Bathtub,
6... Vacuum break valve, 7... Bath pot, 8A, 8B...
... Forced circulation path, 9 ... Circulation pump, a ... Restricted space section, c ... Discharge port, d ... Bathtub side suction port.

Claims (1)

[Claims] 1 A water heater 1 that connects a bathtub 4 and a bath pot 7 through forced circulation paths 8A and 8B with a circulation pump 9 interposed therein, heats tap water, and supplies hot water produced by the heating at tap pressure. is a bath device connected to the lower part of the bathtub 4 via a hot water supply path 3A equipped with a vacuum breaker valve 6 at a higher place than the bathtub 4, the interior of the bathtub 4 or a restricted space communicating therewith. In part a, the discharge port c of the hot water supply path 3A and the bathtub side suction port d of the forced circulation paths 8A and 8B are connected to the hot water supplied from the water heater 1, the feeding pressure from the water heater 1, and the circulation pump. The bath apparatuses are arranged opposite to each other so as to be delivered to the bathtub-side suction ports d of the forced circulation paths 8A and 8B in the form of a fountain stream with the cooperation of the suction pressures of 9.