JP2001133038A - Hot-water supplier for bathtub - Google Patents

Abstract

PROBLEM TO BE SOLVED: To fill a bathtub with hot-water correctly to a set level of hot-water by coping with the fluctuation of a pressure detecting value of a pressure sensor due to the affection of air, remaining in a returning pipeline, a piping condition or the like. SOLUTION: Upon filling a bathtub 11 with hot-water, the hot-water is supplied into the bathtub 11 from a hot-water supplying passage 37 through a sending pipeline 40 under a condition that the returning pipeline 41 is filled with the hot-water by supplying hot-water from a hot-water supplying passage 37 into at least the returning pipeline 41 by switching a flow passage. The bathtub 11 is filled by supplying hot-water by an amount corresponding to the change of a pressure corresponding to a set level of hot-water filling based on a reference of the value of a pressure detected by a pressure sensor 47 before the level of hot-water in the bathtub arrives at the connecting height of the returning pipeline 41. When the value of pressure, detected by the pressure sensor 47, is fluctuated before a time point whereat the level of hot-water in the bathtub 11 arrives at the connecting height of the returning pipeline 41, the hot-water is filled to the set level of hot-water filling based on the fluctuated pressure value. The hot-water is filled correctly to the set level of the same while coping with the fluctuation of detecting value of pressure of the pressure sensor due to the affection of remaining air in the returning pipeline 41, a piping condition or the like.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply device for a bath tub having an automatic hot water filling function.

[0002]

2. Description of the Related Art Conventionally, for example, Japanese Patent Laid-Open No.
As described in the publication, in a circulating heat retaining type bath tub hot water supply device having an automatic hot water filling function, an outgoing pipe and a return pipe of a circulating path are connected to a circulating metal fitting of the tub, and the outgoing pipe of the circulating path is connected. Is provided with a circulation pump and a warming heater, and a return pipe is provided with a circulation electric valve and a pressure sensor. A hot water supply path for supplying hot water adjusted to a set hot water temperature by a mixing valve is connected to the circulation path, and a hot water supply electric valve and a flow rate sensor are provided in the hot water supply path.

[0003] Then, at the time of the first hot water supply in a state where there is no data such as the size of the bathtub, the electric valve for hot water supply and the electric valve for circulation are opened, and the hot water supply path is passed through two pipes, an outgoing pipe and a return pipe. When the bathtub is supplied with hot water and a predetermined amount of hot water is supplied, the electric valve for circulation is closed and the bathtub is supplied with hot water through one pipe of the going pipe so that the water level in the bathtub can be detected by the pressure sensor. In this state, as shown in FIGS. 19A and 19B, the pressure of hot water filled in the return pipe is detected by the pressure sensor, and the pressure value P0 of the pressure sensor is constant. When the level of the hot water in the bathtub reaches the height of the circulation fitting and the hot water in the bathtub and the hot water in the return pipe are connected, the pressure of the hot water filled in the return pipe is detected. The pressure value of the pressure sensor that has been constant starts to change, and the hot water corresponding to the pressure change amount ΔP up to the hot water set water level is supplied based on the pressure value P0 at the time when the pressure sensor is constant, and the hot water is removed. . At this time, the correspondence between the water level and the hot water supply amount is stored in the storage unit.

[0004] Further, at the time of the second and subsequent hot water pouring, the hot water corresponding to the hot water set water level is supplied from the hot water supply path to the circulation path based on the correspondence between the water level and the hot water supply amount stored in the storage section. Hot water is supplied to the bath tub through two pipes, i.e., an outgoing pipe and a return pipe, and the hot water is poured to a set water level.

[0005]

As described above, in the conventional hot water supply apparatus for a bathtub, the hot water is supplied to the bathtub through the two pipes of the circulation pipe and the return pipe at the time of the first hot water supply, so that each pipe is supplied. It is possible to fill the hot and cold water by bleeding air inside, for example, the air bleeding in the return pipe is incomplete, or the middle of the pipe is largely bent in the vertical direction to bypass obstacles etc. Depending on the piping conditions such as installation, it may also affect the pressure detection by the pressure sensor provided on the return pipe, collecting data at the time of the first hot water filling and accurate setting for the hot water setting water level at the next hot water filling. You may not be able to do hot water.

For example, as shown by a broken line in FIG. 19 (a), when air remains even when the return pipe is filled with hot water, the pressure value P0 detected by the pressure sensor decreases to the pressure value P1. Although it may fluctuate, even in this case, hot water corresponding to a predetermined pressure change amount ΔP is supplied and the hot water is supplied based on the pressure value P0 when the pressure is constant, so that the pressure value is changed from the pressure value P1 to the pressure value P0. Even if the pressure change amount α that rises is increased, hot water is supplied even though hot water has already been supplied, and the hot water supply amount increases accordingly, and the actual hot water level {P0 + ΔP + (P0−P1)}. However, the water level rises above the set water level.

[0007] As shown by a broken line in FIG.
When the air in the return pipe escapes and decreases after filling the return pipe with hot and cold water, the pressure value P0 detected by the pressure sensor may suddenly rise and fluctuate to the pressure value P2. The hot water corresponding to the predetermined pressure change amount ΔP is supplied and the hot water is supplied based on the pressure value P0 at the time when the pressure is constant, so that the amount of change from the pressure value P0 to the pressure value P2 is actually increased. It is determined that hot water was supplied even though the hot water was not supplied, and the amount of hot water supplied decreased accordingly, and the actual hot water level {P0 + (ΔP−P2)} dropped below the hot water set water level.

The present invention has been made in view of such a point, and responds to fluctuations in the pressure value detected by the pressure sensor due to the influence of air remaining in the return pipe and pipe conditions, and accurately adjusts the set water level of the hot water. It is an object of the present invention to provide a hot water supply device for a bathtub that can be hot-watered.

[0009]

According to a first aspect of the present invention, there is provided a hot water supply apparatus for a bathtub, a hot water supply path for supplying hot water, a circulation path having an outgoing pipe and a return pipe connected to the bathtub, respectively, and these hot water supply paths. Flow path switching means for switching a flow path between an outgoing pipe and a return pipe; a circulating pump provided in the circulating path; a pressure sensor provided in a returning pipe of the circulating path; At the time of hot water supply, at least the return pipe is supplied with hot water from the hot water supply path by the flow path switching means by the flow path switching means, and the hot water is filled from the hot water supply path and supplied to the bath tub through the outgoing pipe. Hot water control means for supplying a pressure change corresponding to the hot water setting water level based on the pressure value detected by the pressure sensor before reaching the connection height of the hot water, and the level of hot water in the bathtub returns to the return pipe. Contact When the pressure value detected by the pressure sensor by the time it reaches the height varies, in which and a correction control means for hot water beam by the hot beam control means the pressure value that varies as a reference.

At the time of hot water supply to the bathtub, the hot water is supplied from the hot water supply channel to at least the return pipe by switching the flow path and the hot water is supplied to the bathtub through the outgoing pipe in a state filled with hot water. Hot water is supplied by supplying a pressure change corresponding to the set water level based on the pressure value detected by the pressure sensor before reaching the connection height of the return pipe. Also,
When the pressure value detected by the pressure sensor fluctuates until the level of the hot water in the bathtub reaches the connection height of the return pipe, the hot water remains in the return pipe by watering based on the fluctuated pressure value. In response to fluctuations in the pressure value detected by the pressure sensor due to the influence of air, piping conditions, etc., the hot water is accurately poured to the set water level.

According to a second aspect of the present invention, in the hot water supply apparatus for a bathtub according to the first aspect, when the pressure value detected by the pressure sensor fluctuates downward, the correction control means controls the downwardly fluctuating pressure value. The hot water is supplied to the hot water setting water level by the hot water control means on the basis of.

[0012] Then, when the pressure value detected by the pressure sensor fluctuates, it can be reliably grasped as a reference point of the fluctuation of the pressure value.

According to a third aspect of the present invention, in the hot water supply apparatus for a bathtub according to the first or second aspect, the correction control means includes means for increasing the pressure value detected by the pressure sensor and increasing when the water level rises. When it fluctuates larger than the change,
The hot water is supplied to the hot water setting water level by the hot water control means based on the pressure value that has risen and fluctuated.

Then, when the pressure value detected by the pressure sensor rises and fluctuates and fluctuates more greatly than the rise change when the water level rises, it can be reliably grasped as a reference point of the fluctuation of the pressure value.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a block diagram of a hot water supply device for a bath tub, in which a bath tub 11 is provided in an indoor bathroom or the like, and an electric water heater 12 and a hot water unit 13 are provided outdoors as a hot water supply source. I have.

The electric water heater 12 employs a water-supply hot-water supply system of a push-up type, in which a heater 22 is disposed at a bottom side in a hot water storage tank 21. The pipe portion 23a of the water supply pipe 23 directly connected to the hot water storage tank 21 is connected to the
A hot water supply pipe 24 is connected to each hot water supply location such as a shower in a bathroom, a hot water mixer tap, a hot water mixer tap in a kitchen, and a hot water mixer tap in a washroom. At a plurality of locations in the vertical direction of the hot water storage tank 21, a plurality of temperature detection sensors 25 for detecting the remaining hot water amount, hot water temperature, water supply temperature, and the like are provided.

In the water heater 12 of the push-up type, the hot water in the hot water storage tank 21 is heated to a set temperature by the heater 22, and the water pressure supplied to the lower part of the hot water storage tank 21 when hot water is supplied from each hot water supply location. Hot water is pushed up and hot water pipe 2
Hot water is supplied through 4. The upper hot water layer and the lower room temperature water layer in the hot water storage tank 21 are separated via a hot / water mixed layer, and the mixed layer rises with the use of hot water.

Further, the hot water unit 13 includes a motor 31.
a of a water supply pipe 23 having an electric mixing valve 31 driven by a.
3b and the hot water supply pipe 24 are respectively connected. The mixing valve 31 mixes the water from the water supply pipe 23 with the hot water from the electric water heater 12, and adjusts the hot water temperature to a set temperature by the mixing ratio of the water and the hot water.

An upper portion of a hopper 33 is connected to a pipe 32 to which hot and cold water is supplied from a mixing valve 31, and the hopper 33 is connected to the water supply pipe 23 and the hot water supply when the water supply pressure is reduced due to water cutoff or the like. It separates the pipe 24 side from the bathtub 11 side, is installed at a position higher than the bathtub 11, and is connected to a pipe 34 for flowing hot and cold water below the hopper 33. The hopper 33 has a pipe 34 from the pipe 32 side.
Hot water supply electric valve 35 driven by, for example, a solenoid or a motor as hot water supply means for opening and closing the hot water flow passage to the side
(Shown in FIG. 4) are provided.

The piping 34 from the hopper 33 includes a piping 34
Is provided with a flow sensor 36 for detecting the amount of hot water flowing through the heater. The mixing valve 31, the pipe 32, the hopper 33, the pipe 34, the flow rate sensor 36, and the like constitute a hot water supply path 37.

A leading end of a pipe 34 from the hopper 33 is connected to a circulation path 39 via a passage switching electric valve 38 as a passage switching means. The circulation path 39 has an outgoing pipe 40 and a return pipe 41, and one end side of the outgoing pipe 40 and the return pipe 41 is connected to the circulating metal fitting 4 installed in the bathtub 11.
2 and the other end is connected to the passage switching motor-operated valve 38.
It is connected to the. A circulation pump 43, which circulates the hot and cold water in the circulation path 39 by forcibly sending the hot and cold water in the circulation pipe 39 from the side of the passage switching electric valve 38 to the bathtub 11 side, and a circulation path 39, A flow switch 44 for detecting the flow of hot and cold water inside, a bath thermistor 45 for detecting the temperature of hot and cold water in the circulation path 39, and a heat retaining heater 46 for heating and maintaining the hot and cold water flowing in the circulation path 39 are provided. The return pipe 41 is provided with a pressure sensor (water level sensor) 47 for detecting a water level in the bathtub 11.

As shown in FIG. 2, the motor-operated valve 38 for switching the flow path includes a hot water supply path 37, an outgoing pipe 40, and a return pipe 41.
Valve box 48 having two piping connections, and this valve box 48
2 (a) and 2 (b), there is a flow path connecting the hot water supply path 37 and the return pipe 41, and FIG. 2D shows a flow path connecting the hot water supply path 37 and the outgoing pipe 40, FIG.
2E and 2F show a flow path connecting the hot water supply path 37 to the outgoing pipe 40 and the return pipe 41, and FIGS. 2G and 2H show a flow path connecting the outgoing pipe 40 and the return pipe 41. Show. As described above, the flow path switching motor-operated valve 38 includes the flow path connecting the hot water supply path 37 and the outgoing pipe 40, the flow path connecting the hot water supply path 37 and the return pipe 41, the hot water supply path 37 and the outgoing pipe 40, and the return path. The flow path connecting the pipe 41, the outgoing pipe 40 and the return pipe 4
Since it is one integrated flow path switching valve that switches to four flow paths of the flow path connecting the first and second flow paths, the flow paths can be easily and reliably switched.

FIG. 3 shows a remote controller 51 disposed on a wall surface of a bathroom and operating the hot water unit 13. The remote controller 51 is a display 5 facing the surface of the remote controller 51.
2 and an operation unit 53, and an operation unit 54 that is opened and closed by a lid (not shown). The time and bathtub 11 are displayed on the display 52.
The hot water setting water level (hot water amount), hot water temperature, hot water supply temperature, and other operation displays are displayed. The figure shows a state in which all display locations are simultaneously displayed. The operation unit 53 includes a bath automatic switch (automatic hot-water switch) 55 for instructing setting and canceling of the automatic hot-water bath, a priority switch 56 for instructing priority to other remote controllers, and a high temperature for instructing high-temperature hot water. A hot water switch 57 and a call switch 58 for instructing generation of a ringing sound by another remote controller are provided. The operation unit 54 includes a bath temperature switch 59 for adjusting and setting the temperature of the hot water in the bathtub 11, a bath amount switch 60 for adjusting and setting the hot water setting water level of the bathtub 11, a hot water supply switch 61 for adjusting and setting the hot water temperature, and a hot water supply. , A water supply switch 63 for instructing water supply, and a cleaning switch 64 are provided. A light emitting diode 65 for displaying the ON state of each of the switches 55 to 57 is provided adjacent to the bath automatic switch 55, the priority switch 56, and the high temperature hot water switch 57.

FIG. 4 is a block diagram of the hot water unit. Reference numeral 71 denotes a control circuit. The control circuit 71 is formed on a substrate 72 and has a CPU 7 as control means.
3, a ROM 74, a RAM 75 as storage means, and the like.

A commercial power supply is provided on the substrate 72 with a leakage breaker 76.
A power transformer 77 for converting commercial power to control power is connected, the circulating pump 43 is connected to the leak breaker 76 via a limiter 78, and the limiter 78 and the heat retaining heater are connected to the leak breaker 76. A switch 79 arranged in series with the switch 46 is connected. The leak breaker 76 is connected to a freeze prevention heater 80 installed in the hot water unit 13 and a freeze prevention thermo 81 that supplies electricity to the freeze prevention heater 80 when the temperature drops below a set temperature.

A mixing valve 31, a hot water supply electric valve 35, a flow path switching electric valve 38, and a remote controller 51 are connected to the substrate 72, and the flow rate sensor 36, the flow switch 44, the bath thermistor 45, and the pressure sensor 47 are connected to the board 72. Is connected.

The detection value of the pressure sensor 47 is A / D converted and input to the CPU 73. The CPU 73 can read the change in the water level as one unit with the detection value of the pressure sensor 47 corresponding to a certain water level difference. it can. For example, every time the water level changes by about 25 mm, the water level change is read as +1 point or -1 point.

When the hot water flows into the bathtub 11, the CPU 73 controls the hot water supply passage 37 and the return pipe 4 with the passage switching electric valve 38.
After connecting a predetermined amount of hot and cold water to the return pipe 41 by connecting it to the hot water 1, the hot water is controlled to the hot water set water level. That is, at the time of the first hot water pouring, the passage switching electric valve 3
8, the hot water supply path 37 and the return pipe 41 are connected to supply a predetermined amount of hot water to the return pipe 41.
At 8, the hot water supply path 37 and the outgoing pipe 40 are connected to supply hot water to the bathtub 11 through the outgoing pipe 40, and the water level in the bathtub 11 returns to the connecting height of the pipe 41 and the water pressure in the bathtub 11 is applied to the pressure sensor 47. After detecting the pressure change point, the correspondence between the water level up to the hot water setting water level and the hot water supply amount detected by the flow rate sensor 36 is stored in the RAM 75, and the first hot water control means for hot water to the hot water setting water level is used. At the time of the next hot water supply in a state where the correspondence between the water level and the hot water supply amount is stored in the RAM 75 and the hot water supply amount, a predetermined amount of hot water is connected by connecting the hot water supply passage 37 and the return pipe 41 with the passage switching electric valve 38. Return piping 41
After the hot water is supplied to the hot water supply path 37 by the flow path switching motor-operated valve 38, the flow path connected to one pipe of the outgoing pipe 40 and the outgoing pipe 40
And switching to one of the flow paths to which the two pipes of the return pipe 41 are connected, and based on the correspondence between the water level and the hot water supply amount stored in the RAM 75, the hot water supply amount corresponding to the hot water setting water level is supplied, It has a function of a next-time hot-water control means for hot-watering to the hot water setting water level. In addition, the CPU 73
It also has a timer function and the like.

Further, at the time of hot water flowing into the bathtub 11, the CPU 73 supplies hot water from the hot water supply path 37 to at least the return pipe 41 by the flow path switching by the flow path switching electric valve 38 to fill the hot water from the hot water supply path 37 with the hot water filled. Hot water is supplied to the bathtub 11 through the outgoing pipe 40, and the level of hot water in the bathtub 11 is returned to the pipe 4
The function of the hot water control means for supplying a pressure change corresponding to the hot water setting water level based on the pressure value detected by the pressure sensor 47 before reaching the connection height of 1, the level of hot water in the bathtub 11 returns. When the pressure value detected by the pressure sensor 47 fluctuates by the time when the connection height of the pipe 41 is reached, a function of a correction control means for watering by the hot water control means based on the fluctuated pressure value is provided. I have.

The function of the correction control means is as follows.
When the pressure value detected in step fluctuates, the function of the hot water control means based on the pressure value that has fluctuated, the pressure value detected by the pressure sensor 47 fluctuates and rises when the water level rises When the temperature rises larger than the change, the system has a function of making the hot water control unit heat the hot water based on the pressure value that has changed.

Next, the operation of the hot water supply device for a bathtub will be described.

The electric water heater 12 boils room temperature water supplied to the hot water storage tank 21 and hot water not used as remaining hot water to a set temperature in a specific time zone such as a midnight power time zone.

Then, the hot water pouring into the bathtub 11 will be described with reference to the flowchart of FIG. Remote control 5
When the first automatic switch 55 is turned on (step 1), an automatic operation continuation timer is started (step 2), and the RAM 75 has reference data for the correspondence between the water level and the hot water supply amount, that is, after installation or the control circuit 71. It is determined whether it is the first hot water after resetting (step 3).

If there is no reference data and it is the first hot water beam,
An initial filling operation is executed by the initial filling control means of the CPU 73 (step 4).
If it is the next hot water pouring after the first time, the next hot water pouring operation is executed by the next hot water pouring control means of the CPU 73 (step 5).

Next, the first hot water will be described with reference to the flowcharts of FIGS. In the first hot water beam, reference data such as a correspondence relationship between a unique water level corresponding to the shape of the bathtub 11 and the amount of hot water supply is collected.

When an initial bathing operation is started by turning on a bath automatic switch 55 of the remote controller 51, first, as shown in FIG. 7, the outgoing pipe 40 of the circulation path 39 is filled with hot water to make the circulation pump 43 prime. Start processing. That is, the hot water supply path 37 and the outgoing pipe 4
0 (step 11), the mixing valve 31 is adjusted to the set temperature set by the remote controller 51 (step 12), and the hot water supply electric valve 35 is opened (step 13). The counting of the flow rate is started (step 14). In this way, the hot and cold water adjusted to the set temperature by the mixing valve 31 is supplied from the hot water supply path 37 to one of the outgoing pipes 40 and filled in the outgoing pipe 40, so that the circulation pump 43 is primed. At this time, by supplying hot water to one pipe of the outgoing pipe 40, the pressure of the hot water flowing in the outgoing pipe 40 is increased and the flow rate is increased, so that the air in the outgoing pipe 40 can be reliably vented.

Until the hot water supply amount detected by the flow sensor 36 reaches a predetermined amount, for example, 1 liter (step 15), whether an error has occurred in the flow sensor 36 (step 16), the hot water supply is started. Then, it is determined whether a predetermined time, for example, 30 seconds has elapsed (step 17). If an error has occurred in the flow sensor 36, the adjustment to the set temperature by the mixing valve 31 is stopped (step 1).
8) The initial value of the control circuit 71, for example, 42 ° C. is set (step 19). When the hot water supply amount detected by the flow rate sensor 36 reaches 1 liter or 30 seconds have elapsed, the hot water supply electric valve 35 is closed (step 20).

Subsequently, as shown in FIG. 8, a process of filling the return pipe 41 of the circulation path 39 with hot and cold water is started. That is, the hot water supply path 37 and the return pipe 41
(Step 21), the mixing valve 31 is adjusted to the set temperature set by the remote controller 51 (step 22), and the electric valve 35 for hot water supply is opened (step 23). Is started (step 24). Thereby, the hot and cold water adjusted to the set temperature by the mixing valve 31 is supplied to the hot water supply path 37.
Then, hot water is supplied through one pipe of the return pipe 41 and the inside of the return pipe 41 is filled. At this time, by supplying hot water through one pipe of the return pipe 41, the pressure of the hot water flowing in the return pipe 41 is increased and the flow rate is increased, so that the air in the return pipe 41 can be reliably vented.

Until the hot water supply amount detected by the flow rate sensor 36 reaches a predetermined amount, for example, 3 liters (step 25), whether there is an error in the flow rate sensor 36 (step 26), the hot water supply is started. Then, it is determined whether a predetermined time, for example, one minute has elapsed (step 27). If an error has occurred in the flow sensor 36, the mixing valve 3
The adjustment to the set temperature by 1 is stopped (step 28),
The initial value of the control circuit 71, for example, 42 ° C. is set (step 29). If the hot water supply amount detected by the flow rate sensor 36 reaches 1 liter or if one minute has passed and a failure flag of the flow rate sensor 36 is generated (step 30),
The hot water supply electric valve 35 is closed (step 31).

Subsequently, as shown in FIG. 9, a process for confirming the presence or absence of remaining hot water in the bathtub 11 is started. That is, the passage switching motor-operated valve 38 switches to the passage connecting the going pipe 40 and the return pipe 41 (step 32).
3 is driven (step 33), and a 1 minute circulation confirmation timer is started (step 34). This allows
The hot and cold water in the circulation path 39 is circulated, and if there is no remaining hot water in the hot and cold water 11, it will not circulate, and if there is remaining hot water, the circulation will be continued.

If there is no remaining hot water in the bathtub 11, the hot water in the circulation path 39 circulates immediately after the circulation starts, and the flow switch 4
4 is turned on (step 35), and then the hot and cold water in the circulation path 39 comes out of the bathtub 11, the flow switch 44 is turned off (step 36), and the circulation pump 43 is stopped (step 37).

Regardless of the presence or absence of remaining hot water in the bathtub 11, for example, when the circulation pump 43 does not rotate, or when the flow switch 4
If the abnormality of No. 4 occurs, the circulation confirmation timer (one minute timer) times out (Step 38) without turning on the flow switch 44 after the circulation starts (Step 38).
It is determined whether or not the failure flag of the flow sensor 36 is established in step (step 39). If it is established, an error is displayed on the remote controller 51 and the hot water is stopped (steps 40 and 4).
1). If the failure flag is not established, step 37
Proceed to.

If there is residual hot water in the bathtub 11, the circulation path 3
The circulation of the hot and cold water continues between the bathtub 9 and the bathtub 11 and the circulation check timer (1 minute timer) times out without turning off the flow switch 44 (step 42). If (Step 43), the hot water is terminated halfway (Step 44), and the operation shifts to the heat retention operation (Step 45). Also, if you have reference data and the next hot water beam (note that the first hot water beam is explained,
Since the steps 11 to 61 are common to the first and second hot-water stirrers, they will be described here.) The temperature of the hot-water in the bathtub 11 circulated in the circulation path 39 is measured by the bath thermistor 45 ( Step 46), the hot water temperature is controlled by the remote controller 5
A predetermined temperature, for example, -10 ° C, from the set temperature set in Step 1
If not (step 47), the heat retention is prohibited, an error is displayed on the remote controller 51, and the hot water is stopped (step 4).
On the other hand, if it is within −10 ° C., the heat insulation is permitted, the hot water is terminated halfway (step 50), and the operation shifts to the heat insulation operation (step 51).

Subsequently, as shown in FIG.
Then, the process of filling the return pipe 41 with hot water and bleeding air is started. That is, the hot water supply passage 37 is controlled by the passage switching electric valve 38.
The flow is switched to the flow path connecting the return pipe 41 (step 52), the hot water supply electric valve 35 is opened (step 53), and the flow rate sensor 36 starts counting the flow rate (step 54). Thus, the hot and cold water adjusted to the set temperature by the mixing valve 31 is returned from the hot water supply passage 37 to the piping 41
The hot water is supplied through one pipe and the inside of the return pipe 41 is filled to release air. At this time, the hot and cold water is returned
By supplying hot water through the pipe, the pressure of hot water flowing in the return pipe 41 is increased and the flow rate is increased.
1 can be reliably vented, and pressure detection by the pressure sensor 47 can be reliably performed.

Until the hot water supply amount detected by the flow rate sensor 36 reaches a predetermined amount, for example, 7 liters (step 55), whether an error has occurred in the flow rate sensor 36 (step 56), the hot water supply is started. Then, it is determined whether a predetermined time, for example, two minutes has elapsed (step 57). If an error has occurred in the flow sensor 36, the mixing valve 3
The adjustment to the set temperature by 1 is stopped (step 58),
The initial value of the control circuit 71, for example, 42 ° C. is set (step 59). If two minutes have passed before the hot water supply amount detected by the flow rate sensor 36 reaches 7 liters, it is determined whether or not the failure flag of the flow rate sensor 36 in step 30 is established (step 60). An error is displayed on the remote controller 51 (step 61) and step 62
If the failure flag is not established, the process directly proceeds to step 62.

The water level in the bathtub 11 with the total amount of hot water supplied until the amount of hot water supplied through the return pipe 41 reaches 7 liters or two minutes has passed is lower than the circulation fitting 42. is there.

Subsequently, as shown in FIG.
When the amount of hot water supplied through 1 reaches 7 liters or two minutes have elapsed, the process of collecting data on the height of the circulation fitting 42 and the reference water level X1 (see FIG. 1) is started. That is, the passage switching motor-operated valve 38 switches to the passage connecting the hot water supply passage 37 and the outgoing pipe 40 (step 62), and the hot water in the bathtub 11 is continuously supplied to the bathtub 11 through one pipe of the outgoing pipe 40. If the water level reaches the height of the circulation fitting 42 and the water pressure in the bathtub 11 is applied to the pressure sensor 47 via the hot water filled in the return pipe 41, the pressure detected by the pressure sensor 47 changes (step 63) It is monitored whether 50 minutes have passed since the automatic continuation timer was started in step 2 or the total hot water supply reached 180 liters (step 64).

In this state, as shown in FIGS. 5A and 5B, the pressure of hot water filled in the return pipe 41 is detected by the pressure sensor 47, and the pressure value P0 of the pressure sensor 47 is detected.
Is constant. Then, the level of the hot water in the bathtub 11 reaches the height of the circulation fitting 42 and the hot water in the bathtub 11 and the hot water in the return pipe 41 are connected. Is detected, and the pressure value of the pressure sensor 47 which has been constant starts to increase. The pressure value detected by the pressure sensor 47 at this time is stored in the RAM 75 as a reference value.

The water level in the bathtub 11 reaches the water level X0 (see FIG. 1) at the height of the circulation fitting 42, and the water pressure in the bathtub 11 is applied to the pressure sensor 47 via the hot water filled in the return pipe 41. When the pressure change is detected by the pressure sensor 47, if the pressure value P0 does not change, the pressure value P0 stored in the RAM 75 is used as a reference value. For example, as shown by a broken line in FIG. 5A, the pressure value P0 detected by the pressure sensor 47 fluctuates to the pressure value P1 when air remains even when the return pipe 41 is filled with hot and cold water. Then, the pressure value P0 stored in the RAM 75 is cleared, and the changed pressure value P1 is set as a new reference value in the RAM 75.
To memorize. Further, as indicated by a broken line in FIG. 5B, the pressure value P0 detected by the pressure sensor 47 is reduced, for example, when the air in the return pipe 41 is reduced after the return pipe 41 is filled with hot and cold water. When the pressure value P2 suddenly changes, the pressure value P0 stored in the RAM 75 is cleared, and the changed pressure value P2 is set as a new reference value.
Store it in M75.

The hot water is supplied until the circulation fitting 42 reaches a reference water level X1 at which the circulation fitting 42 is submerged based on the reference value of the pressure value stored in the RAM 75. That is, the detection voltage of the pressure sensor 47 is A / D converted and input to the CPU 73,
At 3, the pressure change of the pressure sensor 47 accompanying the rise of the water level, that is, the water level change, is counted as +1 point based on the pressure change point. Then, it is monitored whether the count value in the CPU 73 reaches a predetermined value, for example, +11 points (step 65), or whether 60 minutes have elapsed since the start of the automatic continuation timer in step 2 (step 66). C
When the count value at PU 73 reaches +11 points, that is, when it reaches the reference water level X1 at which the circulation fitting 42 is submerged based on the pressure change point, the hot water supply electric valve 35 is closed (step 67).

If there is no pressure change in step 63 and if 50 minutes have elapsed since the start of the automatic continuation timer or the total hot water supply reached 180 liters in step 64, it is determined that an abnormality has occurred, and an error is displayed on the remote controller 51. On the other hand, when the automatic continuation timer is started in step 66 before the count value in the CPU 73 reaches +11 point in step 65 before the count value in the step 73 reaches +11 point, an error is displayed on the remote controller 51. (Step 6
9). These abnormalities are caused when the water level is already above the circulation fitting 42 when the detection of the pressure change point is started and the pressure change point cannot be detected, or when the drain plug of the bathtub 11 comes off. In this case, the amount of hot water in the bathtub 11 (for example, whether or not the flow switch 44 is turned on by circulating the water between the bathtub 11 and the circulation path 39) or the water level is checked to determine whether or not there is hot water (step). 7
0, 71), if there is hot water in the bathtub 11, the hot water is completed (step 72), and the operation shifts to the warming operation (step 7).
3) If there is no hot water in the bathtub 11, the hot water is stopped (step 74).

Subsequently, as shown in FIG. 12, after the hot water is supplied to the bathtub 11 to the reference water level X1 at which the circulation fitting 42 is submerged,
The process of confirming the rotation of the circulation pump 43 is started. That is, the forward pipe 40 and the return pipe 4
1 (step 75), and drives the circulation pump 43 (step 76). After a lapse of a predetermined time, for example, 20 seconds (step 77), the circulation pump 43 is stopped (step 78). In addition, it is ensured that the air in the going pipe 40 and the returning pipe 41 of the circulation path 39 is vented.
After a predetermined time, for example, after elapse of 10 seconds (Step 7
9) The circulation pump 43 is driven again (step 80),
Whether the flow switch 44 is turned on (step 8
1) Monitor the elapse of 5 minutes (step 82).

If the circulation pump 43 operates normally, hot water circulates between the bathtub 11 and the circulation path 39, and the flow switch 44 is turned on, so that the circulation pump 43 is stopped (step 83).

If the flow switch 44 is not turned on even after 5 minutes due to an abnormality of the circulation pump 43, an error is displayed on the remote controller 51 (step 84) and the hot water is stopped (step 85).

Subsequently, as shown in FIG. 13, after it is confirmed that the rotation of the circulation pump 43 is normal, the bathtub 11
The hot water filling up to the set water level is started while collecting data on the correspondence between the specific water level and the hot water supply amount corresponding to the shape and the like. That is, the flow path switching motor-operated valve 38 switches the flow path to connect the hot water supply path 37 and the outgoing pipe 40 (step 8).
6) The water level corresponding to the pressure detected by the pressure sensor 47 is set as the reference water level X1, and the reference water level X1 is stored in the RAM 75 in association with the total hot water supply up to this point (step 87).

Open the electric valve 35 for hot water supply (step 8).
8) The hot and cold water adjusted to the set temperature by the mixing valve 31 flows out of the hot water supply path 37 and passes through one of the pipes 40 to form the bathtub 1.
While supplying hot water to 1, the change in water pressure detected by the pressure sensor 47, that is, the change in water level is monitored. Whether the hot water set water level Xn set by the remote control 51 reaches the water level Xn (step 89);
While monitoring the elapse of 60 minutes from the start of data collection (step 90), each time the water level reaches a preset water level point X2, X3, X4,... From the reference water level X1, each water level point X2, X3,. X4 ... and each water level point X
RAM corresponding to each total hot water supply up to the point of 2, X3 ...
75 are stored in sequence (step 91). The reference water level X1 and the respective water level points X2, X3.
Corresponds to the scale of the bathtub water level displayed in 1.

When it is detected that the water level in the bathtub 11 has reached the hot water set water level Xn, the electric valve 35 for hot water supply is closed (step 92), and the first hot water supply is completed (step 9).
3).

If 60 minutes elapse before the water level in the bathtub 11 reaches the hot water set water level Xn, an error is displayed on the remote controller 51 (step 94), and the operation shifts to the warming operation (step 95).

Subsequently, after the completion of the first hot water filling, a process for confirming a drop in the hot water temperature due to heat loss of the pipes or the like is started.
That is, the passage switching electric valve 38 switches to the passage connecting the going pipe 40 and the return pipe 41 (step 9).
6), it is checked whether the remaining hot water in the bathtub 11 is 60 liters or more (step 97). If it is 60 liters or less, the operation shifts to the heat keeping operation without checking the hot water temperature (step 98). Also,
If it is 60 liters or more, the circulation pump 43 is driven (step 99), and after a predetermined time, for example, after 3 seconds, the hot water in the bathtub 11 is drawn into the circulation path 39 and circulates through the location of the bath thermistor 45 ( Step 100), the temperature of the hot water is measured by the bath thermistor 45 (Step 101). If the measured hot water temperature is within -0.5 ° C from the set temperature (Step 102), the operation shifts to the warming operation (Step 103).
If the temperature is equal to or higher than 0.5 ° C., a correction process is performed so that the adjusted temperature of the mixing valve 31 is increased to the set temperature at the next hot water filling (step 104).

As described above, in the first hot water beam, a predetermined amount of hot water is supplied to the return pipe 41 by connecting the hot water supply path 37 and the return pipe 41 by the flow path switching motor-operated valve 38, and then the flow path switching electric valve is turned on. The hot water supply path 37 and the outgoing pipe 40 are connected by the valve 38, and hot water is supplied to the bathtub 11 through the outgoing pipe 40. The water level of the bathtub 11 returns to the connecting height of the pipe 41, and the water pressure in the bathtub 11 is sent to the pressure sensor 47. After detecting the applied pressure change point,
Since the correspondence between the water level up to the hot water setting water level Xn and the hot water supply amount is stored in the RAM 75, it is possible to reliably obtain data on the correspondence between the unique water level and the hot water supply amount corresponding to the shape of the bathtub 11 and the like.

When the pressure value detected by the pressure sensor 47 fluctuates until the level of the hot water in the bathtub 11 reaches the connection height of the return pipe 41, the hot water is set based on the fluctuated pressure value. Since the hot water is supplied by supplying the pressure change corresponding to the water level, it is possible to cope with fluctuations in the pressure value detected by the pressure sensor 47 due to the air remaining in the return pipe 41 and the influence of pipe conditions, etc. You can boil water.

Further, when the pressure value detected by the pressure sensor 47 fluctuates, the fluctuation of the pressure value can be reliably grasped because the pressure value which fluctuates is used as a reference. Further, when the pressure value detected by the pressure sensor 47 fluctuates upward and fluctuates more greatly than the rise change when the water level rises, the fluctuation of the pressure value is reliably detected because the pressure value that fluctuates is used as a reference. Can be.

Next, the next hot water will be described with reference to the flowcharts of FIGS. In the next hot water beam, based on the correspondence between the specific water level corresponding to the shape of the bath tub 11 and the like and the amount of hot water supply taken in the first hot water beam, the hot water setting water level is quickly and accurately set. I am trying to do it.

When the next bath operation is started by turning on the bath automatic switch 55 of the remote controller 51, first, as shown in FIG. 14, the processing from step 11 to step 61 described for the first bath is executed. By this processing, the outgoing pipe 40 of the circulation path 39 is filled with hot water to make the circulation pump 43 prime, and the return pipe 4 of the circulation path 39
A process for filling the hot water in 1, a process for confirming the presence or absence of remaining hot water in the bathtub 11, and a process for filling the return pipe 41 of the circulation path 39 with hot water and bleeding air are sequentially executed.

During the process of filling the return pipe 41 of the circulation path 39 with hot water and bleeding air, the mixing valve 3
In a state in which the hot water adjusted to the set temperature in step 1 is supplied from the hot water supply path 37 through one return pipe 41, in step 55, the amount of hot water supplied through the return pipe 41 reaches 7 liters. After 2 minutes have passed at 57, the hot water supply path 37 and the outgoing pipe 4
0 and the return pipe 41 are switched to the flow path (step 111).
Hot water supply to the bathtub 11 is started through the pipe, and counting of the flow rate by the flow rate sensor 36 is started (step 112).

Since 60 minutes have not elapsed since the start of the automatic continuation timer in step 2 (step 113), the hot water setting water level set by the remote controller 51 at the time of this hot water pouring is determined at the time of the first hot water pouring or before. If the data is taken at the next hot water filling and stored in the RAM 75 (step 114), the hot water supply amount corresponding to the hot water setting water level is determined from the RAM 75, and the set hot water to be supplied by the current hot water is set as the hot water setting amount. It is monitored that the amount of hot water from the start of the hot water reaches the set amount (step 115).

When the amount of hot water supplied from the start of the current hot water flow reaches the set amount, the electric valve 35 for hot water supply is closed (step 1).
16), the next hot water filling is completed (step 117).

After the completion of this hot water beam, a process for confirming a drop in the hot water temperature due to heat loss of the pipes and the like is started. In other words, the passage switching electric valve 38 switches to the passage connecting the going pipe 40 and the return pipe 41 (step 11).
8), it is checked whether the remaining hot water in the bathtub 11 is 60 liters or more (step 119). If the remaining hot water is 60 liters or less, the operation shifts to the warming operation without checking the hot water temperature (step 120). If it is 60 liters or more, the circulation pump 43 is driven (step 121), and after a predetermined time, hot water in the bathtub 11 is drawn into the circulation path 39 and circulates through the bath thermistor 45, for example, for 3 seconds. Later (Step 12
2) Measure the hot water temperature with the bath thermistor 45 (step 1)
23) If the measured hot water temperature is within -0.5 ° C. from the set temperature (step 124), the operation shifts to the warming operation (step 1).
25) If the temperature is equal to or higher than -0.5 ° C., the adjustment temperature of the mixing valve 31 is increased at the time of the next hot water dispensing, and a correction process is performed so as to reach the set temperature (step 126).

In step 113, if 60 minutes have passed since the start of the automatic continuation timer, an error is displayed on the remote controller 51 (step 127), and the amount or level of hot water in the bathtub 11 is checked to determine whether there is hot water. Then, if there is hot water in the bathtub 11 (steps 128 and 129), the hot water is completed and the operation is shifted to the warming operation (steps 130 and 129).
131) If there is no hot water in the bathtub 11, the hot water is stopped (step 132).

In step 114, at the time of this hot water pouring, the hot water setting water level set by the remote controller 51 is higher than the water level stored in the RAM 75 at the time of the first hot water pouring or the previous hot water pouring. When the water level is set, hot water filling to the set water level is started while collecting data on the correspondence with the hot water supply amount up to the water level.

That is, as shown in FIG. 15, the water level immediately below the water level set by the remote control 51 (the remote control 5
If there is data on the water level one level below the scale of the bathtub water level displayed in 1) (step 133), or if there is no data on the water level below it (step 134), the lower water level is determined in order. Confirm the water level with the data of the correspondence between the water level and the hot water supply.If the water level with the data is confirmed, the hot water supply from the start of the current hot water flow to the set amount of the hot water supply corresponding to the water level is confirmed. The arrival is monitored (step 135).

If it is confirmed in order that there is data at the lower water level, and if the water level reaches the minimum water level setting (step 136), it is assumed that an error has occurred (step 137) and the hot water is removed. (Step 138).
The operation shifts to the warming operation (step 139).

When the hot water supply amount from the start of the current hot water supply reaches the set amount of the hot water supply amount corresponding to the water level having the data, the electric valve 35 for hot water supply is closed (step 140), and the rotation of the circulation pump 43 is confirmed. Start the process. That is, the passage switching motor-operated valve 38 switches to the passage connecting the going pipe 40 and the return pipe 41 (step 141), and drives the circulation pump 43 (step 142).
For example, after elapse of 20 seconds (Step 143), the circulation pump 43 is stopped (Step 144), and the circulation pump 43 is bleed. After a lapse of a predetermined time, for example, after 10 seconds have elapsed (step 145), the circulation pump 43 is driven again (step 146), and the flow switch 44 is turned on (step 147), and the elapse of 5 minutes is monitored (step 147). Step 148).

If the circulation pump 43 operates normally, hot water circulates between the bathtub 11 and the circulation path 39, and the flow switch 44 is turned on, so that the circulation pump 43 is stopped (step 149).

If the flow switch 44 is not turned on even after 5 minutes due to an abnormality of the circulation pump 43, an error is displayed on the remote controller 51 (step 150), and the hot water is stopped (step 151).

Subsequently, as shown in FIG. 16, after it is confirmed that the rotation of the circulation pump 43 is normal, the bathtub 11
The hot water filling up to the set water level is started while collecting data on the correspondence between the specific water level and the hot water supply amount corresponding to the shape and the like. That is, the passage switching motor-operated valve 38 switches to the passage connecting the hot water supply passage 37 and the outgoing pipe 40 (step 15).
2) Open the electric valve 35 for hot water supply (step 153) and detect the hot water adjusted to the set temperature by the mixing valve 31 from the hot water supply path 37 to the bathtub 11 through one pipe of the pipe 40 while detecting the hot water with the pressure sensor 47. The change in water pressure, that is, the change in water level, is monitored. The water level set by the remote controller 51 reaches the set water level Xn (step 154), or while monitoring the elapse of 60 minutes from the start of data collection (step 155), the water level set in advance from the water level of the data is monitored. Each time a water level point (corresponding to the scale of the bathtub water level displayed on the remote control 51) is reached, each water level point and each total hot water supply amount up to each water level point are sequentially stored in the RAM 75 in association with each other (step). 156).

If it is detected that the water level in the bathtub 11 has reached the hot water set water level, the hot water supply motor-operated valve 35 is closed (step 157) and the first hot water supply is completed (step 15).
8).

If 60 minutes have passed before the water level in the bathtub 11 reaches the hot water set water level, an error is displayed on the remote controller 51 (step 159), and the operation shifts to the warming operation (step 160).

Subsequently, after the completion of the first hot water filling, a process for confirming a drop in the hot water temperature due to heat loss of the pipes or the like is started.
That is, the passage switching electric valve 38 switches to the passage connecting the going pipe 40 and the return pipe 41 (step 16).
1) It is checked whether or not the remaining hot water in the bathtub 11 is 60 liters or more (step 162). If it is 60 liters or less, the operation shifts to the heat keeping operation without checking the hot water temperature (step 163). If it is 60 liters or more, the circulation pump 43 is driven (step 164), and after a predetermined time, hot water in the bathtub 11 is drawn into the circulation path 39 and circulates through the bath thermistor 45, for example, for 3 seconds. Later (Step 16
5) Measure the hot water temperature with the bath thermistor 45 (step 1)
66) If the measured hot water temperature is within -0.5 ° C. from the set temperature (step 167), the operation shifts to the warming operation (step 1).
68) If the temperature is equal to or more than -0.5 ° C., the adjustment temperature of the mixing valve 31 is increased at the time of the next hot water dispensing, and a correction process is performed so as to reach the set temperature (step 169).

As described above, in the next hot water beam, the RAM 75
In the state where the correspondence between water level and hot water supply is stored in
After connecting the hot water supply path 37 and the return pipe 41 with the passage switching electric valve 38 to supply a predetermined amount of hot water to the return pipe 41,
The pipe 4 that goes to the hot water supply path 37 by the passage switching electric valve 38
The flow is switched to the flow path connecting the two pipes 0 and the return pipe 41, and the flow rate sensor 36 monitors the hot water supply amount corresponding to the hot water set water level based on the correspondence between the water level and the hot water supply amount stored in the RAM 75. Since the hot water is supplied while the hot water is being supplied, the hot water can be accurately and quickly supplied to the set water level.

Further, the outgoing pipe 40 and the return pipe 41
By supplying hot water one pipe at a time, the outgoing pipe 40 and the return pipe 41 can be reliably filled with hot water, circulation can be smoothly confirmed during hot water filling, and the hot water pouring time can be reduced.

In addition, the water level without data is
Even if the water level is set as the hot water level, it is possible to run the water to the hot water level while collecting data. At this time, the hot water supply path 37 and the return pipe 41 are connected by the flow path switching motor-operated valve 38 even at the time of the next hot water supply, and hot water is returned to the return pipe 4.
By supplying hot water through one pipe, the pressure sensor 47
Is ensured to evacuate the air in the return pipe 41 provided with the pressure sensor 47, so that the water level in the bathtub 11 can be reliably detected by the pressure sensor 47, and the specific water level and hot water supply amount corresponding to the shape of the bathtub 11 and the like can be confirmed. Data collection of correspondence can be ensured.

At the time of the next hot water supply, when the hot water supply amount corresponding to the hot water set water level is supplied, the hot water is supplied by two pipes, the outgoing pipe 40 and the return pipe 41, so that the hot water supply efficiency is increased and the hot water supply time is increased. However, the circulation pump 43 provided in the outgoing pipe 41 may be driven by only one outgoing pipe 40. This depends on the piping conditions,
Insufficient hot water supply pressure, depending on the hot water to the bathtub 11 installed on the second floor, etc., it is more effective to drive the circulation pump 43 provided in the outgoing pipe 41 with only one outgoing pipe 40 by supplying pressurized hot water. The reason is that the hot water supply efficiency can be increased and the hot water dispensing time can be shortened as compared with the two-tube hot water supply. In consideration of such things, at the time of hot water after installation,
The amount of hot water supplied by the two-tube hot water supply and the amount of hot water supplied by the one-tube hot water supply may be measured by the flow rate sensor 36, and the measured values may be compared to automatically select a hot water supply method with high water supply efficiency.
In a bathtub hot water supply device without the flow rate sensor 36, a changeover switch may be connected to the control circuit 71 to enable manual switching. In addition, regardless of the time of the first hot water or the next hot water, when the hot water is supplied to the bathtub 11 through one pipe of the outgoing pipe 40, the circulating pump 43 is driven to reduce the hot water time.

The flow sensor 36 and the pressure sensor 4
By having both of 7, at the time of hot water next time,
Even if one of the flow sensor 36 and the pressure sensor 47 has a failure, the hot water can be poured based on the normal detection of the other. In this case, the CPU 73 includes a function of failure detection means for detecting failure of the flow sensor 36 and the pressure sensor 47,
A function of a hot water dispensing means for dispensing water based on the detection of one of them when one of them fails.

That is, as shown in FIG. 17, the hot water supply for the hot water supply amount corresponding to the hot water set water level is performed based on the detection of the flow rate sensor 36 and the hot water is supplied. When the electric valve 35 is opened and hot water is actually flowing, it is determined whether or not the flow of the hot water is detected by the flow sensor 36 (step 201). The hot water filling process is continued (step 202), and if not detected, it is determined that the flow rate sensor 36 has failed and the process is changed to the hot water filling process by the pressure sensor 47 (step 203). That is, the outgoing pipe 40
The water level in the bathtub 11 is monitored from the change in the pressure value detected by the pressure sensor 47 of the return pipe 41 while the hot water is supplied to the bathtub 11 through the hot water bath, and the hot water is poured to the hot water set water level. At this time, it is determined whether the pressure sensor 47 detects a change in the pressure value (step 204).
7 is continued (step 205), and if not detected, it is determined that the pressure sensor 47 has failed, and the hot water is stopped (step 206).

As shown in FIG. 18, during the next hot watering operation, in order to hot water to the hot water setting water level with no data in step 114, the hot water is set to the hot water setting water level based on the detection of the pressure sensor 47. In the above, while the hot water is supplied to the bathtub 11 through the going pipe 40, the water level in the bathtub 11 is monitored from the change in the pressure value detected by the pressure sensor 47 of the return pipe 41. It is determined whether or not a change in pressure value is detected at 47 (step 301). If detected, the hot water processing by the pressure sensor 47 is continued (step 302). If not detected, it is determined that the pressure sensor 47 has failed. Then, the process is changed to the hot water dispensing process by the flow sensor 36 (step 303). That is, while detecting the flow rate by the flow rate sensor 36, the total hot water supply amount from the start of hot water supply is monitored, and a predetermined amount of hot water is supplied. At this time, it is determined whether or not the flow of hot water is detected by the flow sensor 36 (step 304).
Is continued (step 305), and if not detected, it is determined that the flow rate sensor 36 has failed and the hot water is stopped (step 306).

When one of the flow sensor 36 and the pressure sensor 47 fails, the remote controller 51
Although an error is displayed in such a manner, the bathtub 11 can be hot-watered and bathing can be performed until a serviceman is called for repair.

Further, the water level set for the automatic watering of the bathtub 11 can be set arbitrarily according to the user's preference. For example, two switches of the remote controller 51 are simultaneously pressed, or a favorite mode switch provided separately on the remote controller 51 is pressed to set a favorite mode (water level storage hot water beam mode).
5 to start hot water supply to the bathtub 11. When the water level in the bathtub 11 reaches the user's favorite water level, the hot water supply is stopped by pressing the bath automatic switch 55 again. Remember, and at the next hot spring, R
The hot water supply amount stored in AM 75 is supplied and the hot water is removed.

Thus, even if it is not possible to cope with the hot water level set in advance by the shape of the bathtub 11 or the like, it is possible to cope by using the favorite mode.

In this case, the switch of the remote controller 51 functions as a favorite mode setting means, and the bath automatic switch 55
Functions as a favorite amount setting means, the RAM 75 functions as a storage means for storing the hot water supply amount set by the favorite amount setting means, and the CPU 73 operates as a hot water supply means corresponding to the hot water supply amount stored in the RAM 75. Has a function.

If the temperature of the hot water in the electric water heater 12 has reached the set temperature, the hot water is allowed. If the hot water temperature has not reached the set temperature, the hot water is prohibited.
Only at the time of the first hot-watering after resetting, the hot-watering may be allowed even in the case where the water temperature in the electric water heater 12 has not reached the set temperature. Generally, immediately after installing the hot water supply device for the bathtub by the installer,
The hot water in the electric water heater 12 cannot be heated because the water in the electric water heater 12 has not been heated to the set temperature at room temperature, and the installer must return to check the hot water later. However, even if the temperature has not reached the set temperature, the hot water beam can be confirmed immediately after installation by allowing the hot water beam. Note that the next time the hot water in the electric water heater 12 does not reach the set temperature, the hot water is prohibited. For this reason, it is possible to prevent the user from erroneously hot watering with water.

In this case, the CPU 73 allows the hot water in the electric water heater 12 at the time of the first hot water supply, even if the temperature of the hot water in the electric water heater 12 has not reached the set temperature. Has a function of control means for inhibiting hot water if the temperature has not reached the set temperature.

The circulation pump 43 may be disposed in the return pipe 41. In this case, the supply of one pipe of hot water to the return pipe 41 allows the circulation pump 43 to be filled with water and the circulation pump 3 and the pressure sensor 47 to be vented. Can be completed at the same time, the process of hot water can be omitted, and the hot water time can be shortened.

The flow path switching means is not limited to one integrated flow path switching valve for switching to four flow paths, and general-purpose on-off valves are provided for the hot water supply path 37, the outgoing pipe 40 and the return pipe 41, respectively. The flow path may be switched by a combination of opening and closing of these three on-off valves, and a general-purpose on-off valve can be used.

[0096]

According to the hot water supply device for a bathtub according to the first aspect of the present invention, when the hot water flows into the bathtub, the pressure detected by the pressure sensor until the water level in the bathtub reaches the connection height of the return pipe. When the value fluctuates, hot water is supplied by supplying a pressure change corresponding to the set water level based on the fluctuating pressure value, so it is detected by a pressure sensor due to the effects of air remaining in the return pipe and pipe conditions. The system can cope with fluctuations in the pressure value to be supplied, and can accurately boil the water to the set water level.

According to the hot water supply device for a bathtub according to the second aspect,
In addition to the effect of the bathtub hot water supply device according to claim 1, when the pressure value detected by the pressure sensor fluctuates downward, the pressure value that fluctuates is used as a reference, so that the fluctuation of the pressure value is reliably detected. Can be.

According to the hot water supply device for a bathtub according to the third aspect,
In addition to the effects of the bathtub hot water supply device according to claim 1 or 2, when the pressure value detected by the pressure sensor rises and fluctuates and rises more greatly than the rise change when the water level rises, the pressure value that fluctuated rises. Since the pressure is used as a reference, a change in the pressure value can be reliably detected.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a hot water supply device for a bathtub according to an embodiment of the present invention.

2 (a), 2 (c), 2 (e) and 2 (g) are explanatory views showing a flow path switching state of a flow path switching motor-operated valve of a bath tub hot water supply apparatus;
(B) (d) (f) (h) is a schematic diagram which shows the flow-path switching state of the flow-path switching electric valve of the hot-water supply device for bathtubs.

FIG. 3 is a front view of a remote control of the bathtub hot water supply device.

FIG. 4 is a block diagram of the bathtub hot water supply device.

FIG. 5A is an explanatory diagram illustrating a relationship between a downward fluctuation of a pressure value detected by a pressure sensor and a pressure change corresponding to a set water level of the hot water, and FIG. 5B is a diagram illustrating a pressure value detected by the pressure sensor; It is explanatory drawing explaining the relationship between rising fluctuation | variation and the pressure change corresponding to a hot water setting water level.

FIG. 6 is a flow chart of a hot water bath of the bathtub hot water supply device.

FIG. 7 is a flowchart of the first hot water beam.

FIG. 8 is a flowchart continued from FIG. 7;

FIG. 9 is a flowchart following FIG. 8;

FIG. 10 is a flowchart continued from FIG. 9;

FIG. 11 is a flowchart following FIG.

FIG. 12 is a flowchart following FIG. 11;

FIG. 13 is a flowchart following FIG.

FIG. 14 is a flow chart of the next hot water ladle.

FIG. 15 is a flowchart following FIG. 14;

FIG. 16 is a flowchart following FIG.

FIG. 17 is a flowchart at the time of failure of the flow sensor.

FIG. 18 is a flowchart when a failure occurs in the pressure sensor.

FIG. 19 (a) is an explanatory diagram for explaining the relationship between the downward fluctuation of the pressure value detected by the pressure sensor and the pressure change corresponding to the set water level of the hot water, and FIG. 19 (b) is a diagram of the pressure value detected by the pressure sensor. It is explanatory drawing explaining the relationship between rising fluctuation | variation and the pressure change corresponding to a hot water setting water level.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 11 Bathtub 37 Hot-water supply path 38 Motor-operated valve for flow path switching as flow path switching means 39 Circulation path 40 Outgoing pipe 41 Return pipe 43 Circulation pump 47 Pressure sensor 73 C as hot water control means and correction control means
PU

Claims (3)

[Claims] 1. A hot water supply path for supplying hot water, a circulation path having an outgoing pipe and a return pipe connected to the bathtub, and a flow path between the hot water supply path, the outgoing pipe and the return pipe. Flow path switching means; a circulation pump provided in the circulation path; a pressure sensor provided in a return pipe of the circulation path; and hot water supply by the flow path switching by the flow path switching means when the hot water flows into the bathtub. At least the return pipe is supplied with hot water from the path and the hot water is filled, the hot water is supplied from the hot water supply path to the bathtub through the outgoing pipe, and the level of the hot water in the bathtub is detected by the pressure sensor before reaching the connection height of the return pipe. A hot water control means for supplying a pressure change corresponding to the hot water setting water level based on the pressure value, and the pressure sensor detects the water level in the bathtub until the water level reaches the connection height of the return pipe. When the pressure value is varied, the hot water device for bathtub, characterized in that and a correction control means for hot water beam by the hot beam control means the pressure value that varies as a reference. 2. The correction control means according to claim 1, wherein when the pressure value detected by the pressure sensor fluctuates downward, the hot water control means causes the hot water to be dewatered on the basis of the decreased pressure value. Hot water supply device for bathtub. 3. The correction control means, when the pressure value detected by the pressure sensor rises and fluctuates and rises more greatly than the rise change at the time of rise of the water level, the hot water control means based on the rise and fluctuate pressure value. The hot water supply device for a bathtub according to claim 1 or 2, wherein the hot water is supplied.