JP2868155B2 - Bathtub water level control device and water level control method - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bathtub water level control device and a water level control method for controlling a water level according to the water pressure in a pipe installed between a water supply source and a bathtub. .

[Conventional technology]

Conventionally, in a fully automatic water heater or a bath kettle, when a pipe connecting the water heater and the bathtub is filled with hot water, the water level in the bathtub can be indirectly detected through the water pressure in the pipe. Therefore, a water level in the bathtub is detected by installing a pressure sensor in the pipe, and the water level in the bathtub is controlled based on the detected water level.

Therefore, in such a water level control device, there is no need to install a water level detecting means in the bathtub, and there is an advantage that the bathtub can be widened.

[Problems to be solved by the invention]

However, in such a water level control device, since the height between the pressure detection means and the bathtub affects the detection pressure of the pressure detection means, the control data is set according to the installation conditions of a house or the like in which the device is installed. , And the reference value cannot be set uniformly.

Accordingly, it is an object of the present invention to provide a bathtub water level control device and a water level control method that take in appropriate reference data irrespective of installation conditions and increase the reliability of water level control.

[Means for solving the problem]

The bath level control device of the present invention is shown in FIGS.
As illustrated in the figure, a water supply source for supplying hot water, a bath tub for storing the hot water supplied from the water supply source, and a water supply source connected between a circulation port formed in the bath tub and the water supply source. A first and a second pipe for supplying the hot water from the water source to the bathtub or for circulating the hot water between the bathtub and the water supply source, and a pressure for detecting a water pressure acting on the first pipe. Detecting means, storing means for storing the pressure detected through the pressure detecting means, and storing the pressure detected by the pressure detecting means as an initial pressure after supplying water for a predetermined time through the first pipe. Means for supplying water through the second pipe, and when the pressure detecting means detects a pressure change indicating that the circulation port is submerged, the water supply is stopped and the water supply is stopped through the first pipe. Regular time Wherein by performing the water supply first
After discharging the air in the pipe, pressure detection is performed, and the detected pressure at that time is stored in the storage means as a reference pressure, and control means for controlling a set water level of the bathtub based on the reference pressure is provided. It is characterized by having.

Further, the bathtub water level control device of the present invention includes a water supply source for supplying hot and cold water, as exemplified in FIG. 1 to FIG.
A tub for storing the hot water supplied from the water supply source, and a circulating port formed in the bath tub and connected between the water supply source to supply the hot water from the water supply source to the bath tub, or First and second pipes for circulating the hot and cold water between the pump and the water supply source; a pump installed in a circulation path formed including the first and second pipes; Water detecting means for detecting flowing water, pressure detecting means for detecting water pressure acting on the first pipe, storage means for storing a pressure detected through the pressure detecting means, and after supplying water to the pump, The hot and cold water in the bathtub is circulated through the circulation path to detect the presence or absence of running water. If no running water is detected in the circulation path, it is determined that there is no hot water in the bathtub and the first pipe Water for a certain amount of time through After that, the pressure detected by the pressure detecting means is stored in the storage means as an initial pressure, water is supplied through the second pipe, and the pressure detecting means detects a pressure change indicating that the circulation port is submerged. Is detected, the water supply is stopped, the air in the first pipe is discharged by supplying water for a certain period of time through the first pipe, and then pressure detection is performed. Stored in the storage means as a reference pressure,
Control means for controlling a set water level of the bathtub based on the reference pressure.

Further, as shown in FIGS. 1 to 5, a water level control method for a bathtub according to the present invention includes:
A tub for storing the hot water from the water supply source, and connected between a circulation port formed in the bath tub and the water supply source to supply the hot water from the water supply source to the bath tub, or First and second pipes for circulating the hot water with a water supply source, pressure detecting means for detecting a water pressure acting on the first pipe, and control means for controlling a set water level in the bathtub. A water level control method for a bathtub provided, comprising: supplying water for a certain period of time through the first pipe, filling the first pipe with the hot water, and measuring an initial pressure by the pressure detecting means; Supplying the hot and cold water to the bath tub through the second pipe, and the pressure detecting means detecting a pressure change indicating that the circulation port is submerged;
Discharging the air in the first pipe by supplying water through the first pipe for a certain time after detecting the pressure change; measuring a reference pressure by the pressure detecting means; Supplying water to the bathtub through the second pipe to reach a set water level.

As shown in FIGS. 1 to 5, the water level control method for a bathtub according to the present invention includes a water supply source for supplying hot water, a bathtub for storing the hot water from the water supply source, and the bathtub. A first port connected between the circulation port and the water supply source to supply the hot water from the water supply source to the bathtub, or to circulate the hot water between the bathtub and the water supply source;
And a second pipe, flowing water detecting means for detecting the presence or absence of flowing water circulating through a circulation path formed by connecting a pump to the first and second pipes, and a hydraulic pressure acting on the first pipe. A water level control method for a bath tub comprising: a pressure detecting means for detecting; and a control means for controlling a set water level in the bath tub, wherein water is supplied for a predetermined time through the first pipe, and the first pipe is After filling with the hot water, the hot water in the bathtub is circulated through the circulation path, and the presence or absence of hot water in the bathtub is determined by detecting flowing water, and water is supplied for a predetermined time through the first pipe. The first
Discharging the air in the pipe, supplying the hot water to the bathtub through the second pipe, and the pressure detecting means detecting a pressure change indicating that the circulation port is submerged; and After detecting a change, the first
Supplying air to the bath for a certain period of time to discharge air in the first pipe to the outside, measuring a reference pressure by the pressure detecting means, and supplying water to the bathtub through the second pipe. And reaching the set water level.

[Action]

In this water level control device, water is supplied through the first pipe for a fixed time. By supplying the water for a certain period of time, the first pipe in which the pressure detecting means is installed is filled with hot water. When the water pressure of the first pipe filled with the hot water is detected by the pressure detecting means, the detected pressure is an initial pressure, and the initial pressure is stored in the storage means.

Next, when water is supplied through the second pipe, the output of the pressure detecting means fluctuates while the water is being supplied. That is, when water is supplied to the bathtub through the second pipe, the water level in the bathtub rises, the water level reaches its circulation port, and when the circulation port is submerged in the hot water, the water level in the bathtub and the second The connection with the hot and cold water in the first pipe is made, and the pressure corresponding to the water level in the bathtub is detected by the pressure detecting means, and this is generated as a pressure fluctuation. Hot water is supplied continuously,
The output change of the pressure detecting means occurs immediately after the circulation port is submerged in water. By taking in the pressure immediately after the pressure fluctuation has occurred, the water level at which the circulation port is submerged is detected by the pressure detecting means. This pressure is taken as a reference pressure and stored in the storage means. The set water level in the bathtub is detected by storing desired hot water in the bathtub. Therefore, the water level in the bathtub can be efficiently and accurately controlled to the set water level based on the reference pressure.

Further, in the water level control device of the present invention, the bathtub,
If it is provided with running water detecting means for detecting the presence or absence of flowing water through a circulation path that circulates the hot water in the bathtub with the first and second pipes, the hot and cold water is circulated through the circulation path, Since the presence or absence can be detected by the flowing water detecting means, it is determined whether the water level in the bathtub is above the circulation port based on the detection result, and more stable water level control can be realized.

Water is supplied for a certain period of time through the first pipe,
When the pipe is filled with the hot and cold water, the pressure detecting means connected to the first pipe is in a state of detecting the pressure acting on the first pipe. Therefore, an initial pressure is measured from the pressure measured through the first pipe by the pressure detecting means.

Next, the hot water is supplied to the bathtub for a certain time through the second pipe. When the water level in the bathtub rises and exceeds the circulation port in the bathtub, a pressure change is detected by the pressure detecting means. When this pressure change occurs, the reference pressure is measured by the pressure detecting means. The set water level is determined from the reference pressure, and the water level in the bathtub can be controlled to the set water level regardless of the installation position.

And if it is provided with a flowing water detecting means for detecting the presence or absence of flowing water through a circulation path formed by the first and second pipes, a circulation path is formed between the first and second pipes and the bathtub. The circulation of hot water is performed, and the presence or absence of hot water in the bathtub is determined based on the presence or absence of circulating hot water, and the presence or absence of hot water in the bathtub is reflected in the measurement or control of the initial pressure, the reference pressure, or the set water level. In addition, the measurement accuracy can be improved, and highly accurate control can be realized.

〔Example〕

Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings.

FIG. 1 shows an embodiment of a bathtub water level control device according to the present invention.

The water level controller, water heater 2 as the water supply source for receiving a supply of clean water W _O of tap water or the like to obtain the desired hot water W _H
Is installed, and hot water W _H
A tub 4 receiving the supply of water is provided.

The tub 4, circulation port 40 for supplying or circulating the hot water W _H
A hot water supply device 2 is connected to the circulation port 40 through a return pipe 6 (hereinafter simply referred to as a pipe 6) as a first pipe and an outgoing pipe 8 (hereinafter simply referred to as a pipe 8) as a second pipe. I have. The pipe 6 mainly returns hot water W _H in the bathtub 4 to the hot water supply device 2 through the circulation port 40, and the pipe 8 mainly supplies hot water W _H from the hot water supply apparatus 2 into the bath tub 4 through the circulation port 40. Piping means. Incidentally, h _E is the reference water level in the tub 4 also,, h _F represents the set water level as required water level for use.

A main heat exchanger 200 is installed in the hot water supply apparatus 2 as first heating means for heating the tap water W _O supplied through a pipe 10 such as a tap water.
At 202, the supply pipe 12 leading to the outside is branched, and the bathtub 4
Hot water _WH is supplied outside. In addition, the two-way valve 206
Is provided, and the hot and cold water _WH that has passed through the two-way valve 206 is supplied to the reheating circuit 208 side.

Hot water W _{H that} has passed through the two-way valve 206 is clean water W _O and hot water W on the bathtub 4 side.
_It is stored in a hopper 210 as a tank installed as a separation means for separating _H. The opening of the pipe 202, the hot water W _H is the system water valve 214 opened and closed by vertical movement by the ball tap 212 installed in the hopper 210 is installed. Moreover, the hopper 210, the water level detection switch 216 for detecting the water level of the hot water W _H is installed.

The water level detection switch 216, as shown in FIG. 2, the sensor unit 218 is attached to form a rod-shaped inner wall of the hopper 210, to move over the sensor unit 218 to the sensor unit 218 by the water level in the hot water W _H Float 2 to detect the water level
20 are provided. Then, the sensor unit 218, the high level detector S _H, and the low level detector S _L is set, the detector S _H, the range D _H of S _L, by the float 220 moves to the D _L , A level signal representing the water level is obtained.

The pipe 222 provided on the bottom side of the hopper 210 includes
Two pipes 226, 228 are provided through the first three-way valve 224, with flowing water detection switch 230 for detecting passage of the hot water W _H to the pipe 226, a pump 232 for pumping hot water W _H is installed , A second three-way valve 234 is connected. The flowing water detection switch 230, the level signal corresponding to the passage of the hot water W _H m
₂ is obtained and added to the hot water supply control unit 16 as a water level control means.

Further, pipes 236 and 238 are connected to the three-way valve 234, and the pipe 236 is connected to a reheating heat exchanger 240 as a second heating means.
Is connected to the pipe 8 through the, also pipe 238 is connected to the pipe 6 while being connected to the pipe 228, the circulation path in the hot water W _H supply and add焚回path 208 for bath 4 is formed.

That is, the hot and cold water W _H for the bathtub 4 can be supplied to the bathtub 4 through two paths, one of which is to close the valve c of the three-way valve 224 and open the valves a and b and to open the valve a of the three-way valve 234. , B are opened and the valve c is closed to supply hot water W supplied from the hopper 210 side.
_H pipe 222, three-way valve 224, pipe 226, pump 232, three-way valve 2
The path from the pipe 8 to the circulation port 40 via the additional heat exchanger 34 and the additional heat exchanger 240, and the other is to close the valve c of the three-way valve 224, open the valves a and b, and open the three-way valve. 234 valves a and c are opened, valve c is closed, and hot water W supplied from the hopper 210 side
_H pipe 222, three-way valve 224, pipe 226, pump 232, three-way valve 2
This is a path from the pipe 6 to the circulation port 40 via the pipe 34 and the pipe 238. Also, circulation of hot water W _H of isochronous add-fired operation, the three-way valve 22
Close the valve a of 4, and open the valves b and c.
By opening the valves a and b, closing the valve c, and driving the pump 232, the pipe 6 is returned from the circulation port 40 of the bathtub 4 as a return pipe, and the pipe 228, the three-way valve 224, the pipe 226, the pump 232,
The circulation port 40 passes through the three-way valve 234, the additional heat exchanger 240, and the pipe 8
Is performed along the route to

The pipe 6 is provided with a branch pipe 242,
A pressure sensor 14 is connected as pressure detection means for detecting the pressure of the pipe 6 representing the water level of the pipe 6. This pressure sensor 14
The level signal m ₁ representing the water pressure is obtained, the hot water supply control section 16
As a control input.

For example, as shown in FIG. 3, a control device including a microcomputer is used in the hot water supply control unit 16, and a central processing unit (CPU) 160 is installed as arithmetic means for performing necessary hot water supply control. . The CPU 160 is connected to a read-only memory (ROM) 161 as storage means for storing a control program and fixed data, and an optional write-read memory (RAM) 162 for storing data being processed and various kinds of data taken in. I have.

In the hot water supply control unit 16, in addition to the level signal m ₁ obtained by the pressure sensor 14, the level signal m ₂ obtained by the flowing water detection switch 230, and other sensors 1 such as a water level detection switch 216,
Various level signal m ₃ ~m _n is filter obtained in 8 (FIL)
After unnecessary components such as noise are removed through 163, they are selectively applied to an analog-to-digital converter (ADC) 165 through a multiplexer (MPX) 164. MPX164 and AD
C165 is integrally configured as AD conversion means. And
Each level signal m ₁ ~m _n which is digitized in ADC165 is, CP
After being taken in by U160 and subjected to predetermined arithmetic processing according to the control program written in ROM161, it is stored in RAM162.

In addition, control input signals V _{C1 to} V _Cn are input to the CPU 160 from control input means such as a drive switch through an input / output circuit (I / O) 166.
Is added, and each of the control input signals V _{C1 to} V _Cn is also taken into account in the arithmetic control as control data. Therefore, by the calculation of the CPU 160, the two-way valve 206, the three-way valve 224, 234, the main heat exchanger 200,
Various control signals V _o1 for controlling the reheating heat exchanger 240 etc.
~V _on is obtained, it is added to the various control means through input-output circuit 166.

The operation of the above configuration will be described with reference to the flowchart of the water level control program shown in FIG. 4 and the temporal change of the water level shown in FIG.

In case the time and bath 4 to the water heater 2 and tub 4 in a house or the like is installed hot water W _H is removed tub 4 is empty, open the two-way valve 206 as an initial operation, hot water W _H to the hopper 210 Supply.

Accordingly, performed in FIG. 4, in step S _1, as shown in the FIG. 5 (A), the time T ₁ of the up time t ₀ ~t ₁ (e.g., 60 seconds) to the water supply from the pipe 8 side.

The water supply from the pipe 8 side is performed by opening the valves a and b of the three-way valve 224 and closing the valve c, and opening the valves a and b of the three-way valve 234 and closing the valve c. Drive pump 232 and connect piping 2
22, three-way valve 224, piping 226, pump 232, three-way valve 234, piping
236 and piping 8. This water supply pipe 8 with filled with hot water W _H, as shown in the FIG. 5 (A), the water level h _A is obtained. At this time, the level signal m ₁ is obtained from the pressure sensor 14, as shown in FIG. 5 (B), in the case where the position of the circulation port 40 of the tub 4 is lower than the height of the pressure sensor 14 is a pressure P ₃ , the height of the pressure sensor 14 and the bathtub 4
When the position of the circulation port 40 is the same, the pressure P ₂ (<P ₃ ) is obtained, and when the position of the circulation port 40 of the bathtub 4 is higher than the height of the pressure sensor 14, the pressure P ₁ (<P ₂ ) is obtained. Pressure depending on the position
P ₃ and P ₂ are positive, and pressure P ₁ is negative.

Next, in step S _2, as shown in the FIG. 5 (A), performs a circulation pump 232 in the interval of time T ₂ (e.g., 40 seconds) up to time t ₁ ~t _2, in the bathtub 4 It is determined whether or not the water level is above the circulation port 40. In this pump circulation, the valve a side of the three-way valve 224 is closed, the valves b and c are opened, the valves a and b of the three-way valve 234 are opened, the valve c side is closed, and the circulation of the bathtub 4 is performed. Piping 6, 228, three-way valve 22 through port 40
4, piping 226, running water detection switch 230, pump 232, three-way valve
A circulation path forming a closed loop is formed by the pipe 234, the pipe 236, the additional heat exchanger 240, and the pipe 8, and the hot and cold water _WH is circulated through the pump 232. During this circulation, the running water detection switch 230
There if no level signal m ₂ representing the flow of hot water W _H is the water level in the tub 4 is that no reached the circulation port 40, i.e., shows that the bath 4 is empty state, By using this information for water level control, the
It is possible to know the presence or absence of _WH , and it is possible to measure various water levels such as the initial water level and the reference water level, and to improve the control accuracy of the set water level.

At this time, since the hot water W _H is sucked from the pipe 6 side to the pump 232, the pressure detected by the pressure sensor 14 at the time T ₂ interval, as shown in FIG. 5 (B), varies violently negative region .

Next, in step S _3, to meet the pipe 6 in hot water W _H, as shown in the FIG. 5 (A), in the interval of time T ₃ to time t ₂ ~t ₃ (e.g., 40 seconds) Water is supplied from the pipe 6 side. That is, the valves a and b sides of the three-way valve 224 are opened, the valve c side is closed, and the valves a and c sides of the three-way valve 234 are opened, the valve b side is closed, and the pump 232 is driven. 222, three-way valve 224, piping 226, pump 232, three-way valve 234, piping 238, and piping 6. This water supply pipe 6 with filled with hot water W _H, as shown in the FIG. 5 (A), the water level h _B is obtained. At this time, the pressure sensor 14 through a pump 232 for hot water W _H is pumped into the pipe 6 side, in the interval of time T ₃
The detected pressure of, as shown in FIG. 5 (B), vigorously fluctuates become irrelevant high pressure conditions the water level h _B.

Next, in step S _4, as shown in the FIG. 5 (A), the time T ₄ to time t ₃ ~t ₄ (e.g., 30 seconds) performs detection of a pressure by the pressure sensor 14 in the section, captures the pressure as the initial water level h _B, and stored in RAM 162. The initial water level h _B indicates a state where the water level in the bathtub 4 has not reached the circulation port 40, that is, a water level when the bathtub 4 is empty. Also,
The time T ₄ is set to stabilize the detection output of the pressure sensor 14 by removing hot water _{WH from} the supply of hot water WH to the pipe 6 in step S _3. Accuracy is increased.

In step S _5, as shown in the FIG. 5 (A), the time t ₄ ~t up to ₆ time T ₅ (e.g., 40 minutes) supply the water from the pipe 8 side in the interval.

In step S _6, it determines during the water supply from the pipe 8 side, whether or not the output change in the pressure sensor 14 has occurred. That is, when continuously supplying hot water W _H in a bath 4, rising water level in the hot water in the bathtub 4 W _H empty state gradually, as indicated by the water level h _C to the FIG. 5 (A), the water level reaches the circulation port 40, the pipe 6 side neck of the circulation port 40 at time t ₅ is submerged, connect with hot water W _H tub 4 side and the hot water W _H in the piping 6, the pipe 6
Is applied with a pressure corresponding to the water level on the bathtub 4 side.
As shown in the FIG. 5 (B), time T ₁₀ represents a section of the front which does not cause pressure fluctuation, the circulation port 40 is submerged at time t _5, the water level pressure from that point (t ₆₎ Rise in proportion,
Shift to water level h _D.

Further, in step S _6, when the pressure sensor 14 does not occur pressure change, for performing continuously the supply of hot water W _H,
Returning to step S _5, continued supply of hot water W _H to the pressure sensor 14 detects the pressure fluctuation in the step S _6, upon detection of a pressure change in step S _6, the process proceeds to a step S _7.

In step S _7, as shown in the FIG. 5 (A), performs a circulation pump 232 in the interval of time T ₆ (e.g. 40 seconds) up to time t ₆ ~t _7, the water level in the bathtub 4 It is determined whether or not is in the circulation port 40 or more. The pump circulation is carried out in the same path as the step S _2, when the water flow detection switch 230 does not produce a level signal m ₂ representing the flow of hot water W _H During this circulation, the water level in the tub 4 is circulated It can be seen that the mouth 40 has not been reached, that is, the inside of the bathtub 4 is empty.

Further, since the hot water W _H is sucked from the pipe 6 side to the pump 232, in a section of the time T _6, the detected pressure of the pressure sensor 14, which represents the water level rises, as shown in FIG. 5 (B),
It shifts to the negative region and fluctuates violently.

Next, in step S _8, the operation for removing the air in the pipe 6 is performed, as shown in FIG. 5 (A), the time t ₇ ~
Water is supplied from the pipe 6 side in a section of time T ₇ (for example, 40 seconds) until t ₈ . May air by pump circulation of step S ₇ is taken into the pipe 6, the water supply by can remove air in the piping 6, it is possible to improve the detection accuracy of the pressure sensor 14. At this time, since the hot water W _H it is pumped by pump 232 to the pipe 6 side, as shown in FIG. 5 (B), in a section of the time T _7, the detected pressure of the pressure sensor 14, irrespective of the water level Fluctuating violently with high pressure rise.

Next, in step S _9, the time to the extent that the pressure fluctuation soothe through step S _8, for example, after a of about 30 seconds, as shown in FIG. 5 (A), the time t ₈ ~ Pressure is detected by the pressure sensor 14 in a section of time T ₈ (for example, 30 seconds) until t ₉ , and the pressure value is set as a reference water level h _E in the RAM 1.
Store in 62. The reference water level h _E is substantially equal to the water levels h _C and h _D (h _E ≒ h _C ≒ h _D ), and represents a water level equivalent to the level of the circulation port 40, respectively.

Set water level h _F in a bathtub 4, since the volume of the tub 4 is known, is set by the reference water level h _E as a reference.

Next, in step S _10, as shown in the FIG. 5 (A), the time t ₉ ~t tub 4 from the pipe 8 side in the interval time T ₉ of ₁₀
To supply the hot water W _H to. Water from the pipe 8 side is performed in the same path as steps S _1.

Next, in step S _11, when whether the water level in the bathtub 4 from the detected pressure of the pressure sensor 14 has reached the set water level h _F is determined, not reached the set water level h _F is a step
Returns to the S _10, the water supply is carried out continuously. Step S
When the water level in the tub 4 reaches the set water level h _F is _11,
Stop water supply and complete water supply control.

When the water level in the tub 4 decreases, the determination is made in step S _11, the water supply is performed returns to the step S _10, it is controlled to the set water level h _F.

〔The invention's effect〕

As described above, according to the present invention, the following effects can be obtained.

(A) By compensating for the positional relationship between the bathtub and the water supply source, the water level in the bathtub can be controlled efficiently and with high accuracy, and highly reliable water level control can be realized.

(B) The presence or absence of hot or cold water circulating in the circulation path is detected by the running water detecting means, and the presence or absence of hot or cold water in the bathtub can be determined with high accuracy from the detection result, and highly reliable water level control can be realized.

[Brief description of the drawings]

FIG. 1 is a block diagram showing an embodiment of a bathtub water level control device according to the present invention, FIG. 2 is a diagram showing a configuration example of a water level detection switch in the bathtub water level control device shown in FIG. 1, FIG. 4 is a block diagram showing a specific configuration example of a hot water supply control unit in the water level control device shown in FIG. 1. FIG. 4 is an embodiment of a water level control method in the bathtub water level control device shown in FIG. FIG. 5 is a flowchart showing a water level control program, and FIG. 5 is a diagram showing a change in the water level controlled by the water level control program shown in FIG. 2 hot water supply device (water supply source) 4 bathtub 6 return pipe (first pipe) 8 outgoing pipe (second pipe) 14 pressure sensor (pressure detecting means) 16 hot water supply control Section (control means) 40 circulating port 162 RAM (storage means) 230 running water detection switch (running water detection means)

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Atsushi Mochizuki 201 Nishi-Kashiwara Nitta, Fuji City, Shizuoka Prefecture ▲ High ▼ Inside Wood Industry Co., Ltd. (72) Inventor Teruyuki Mochizuki 201 Nishi-Kashiwara Nitta 201, Fuji City, Shizuoka Prefecture ▲ Taka ▼ Inside Wood Industry Co., Ltd. (56) References JP-A-62-118554 (JP, A) JP-A-63-197847 (JP, A) JP-A-1-98853 (JP, A) JP-A 63-118847 153355 (JP, A) JP-A-63-247546 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) F24H 1/00 606 E

Claims (4)

(57) [Claims] 1. A water supply source for supplying hot water, a bathtub for storing the hot water supplied from the water supply source, and a water supply source connected to a circulation port formed in the bathtub and the water supply source. First and second pipes for supplying the hot water to the bathtub or for circulating the hot water between the bathtub and the water supply source; and pressure detecting means for detecting a water pressure acting on the first pipe. And a storage means for storing the pressure detected through the pressure detection means, and after supplying water for a certain time through the first pipe,
When the pressure detected by the pressure detection means is stored in the storage means as an initial pressure, water is supplied through the second pipe, and the pressure detection means detects a pressure change indicating that the circulation port is submerged. Stopping the water supply, discharging air in the first pipe by supplying water for a certain time through the first pipe, and then performing pressure detection, and using the detected pressure at that time as a reference pressure, Control means for storing in a storage means for controlling a set water level of the bath tub based on the reference pressure, a bath tub water level control device. 2. A water supply source for supplying hot water, a bathtub for storing the hot water supplied from the water supply source, and a water supply source connected to a circulation port formed in the bathtub and the water supply source. First and second pipes for supplying the hot water to the bathtub or for circulating the hot water between the bathtub and the water supply source; and a circulation formed including the first and second pipes. A pump installed in a road, running water detecting means for detecting flowing water during operation of the pump, pressure detecting means for detecting water pressure acting on the first pipe, and the pressure detected through the pressure detecting means After supplying water to the pump, the hot water in the bath tub is circulated through the circulation path to detect the presence or absence of flowing water, and if no running water is detected in the circulation path, the bath tub Judge that there is no hot water inside After supplying water for a certain period of time through the first pipe, the pressure detected by the pressure detecting means is stored in the storage means as an initial pressure, and water is supplied through the second pipe to perform the pressure detection. When the means detects a pressure change indicating that the circulation port is submerged, the water supply is stopped and the air in the first pipe is discharged by supplying water for a certain time through the first pipe. And a control means for performing pressure detection, storing the detected pressure at that time in the storage means as a reference pressure, and controlling a set water level of the bath tub on the basis of the reference pressure. Water level control device. 3. A water supply source for supplying hot water, a bath tub for storing the hot water from the water supply source, and a tub connected to a circulation port formed in the bath tub and the water supply source, the water supply source being connected to the bath tub. A first and a second pipe for supplying the hot water or circulating the hot water between the bathtub and the water supply source;
A method for controlling a water level in a bathtub, comprising: a pressure detection unit that detects a water pressure acting on the first pipe; and a control unit that controls a set water level in the bathtub. After supplying water and filling the first pipe with the hot water, measuring the initial pressure with the pressure detecting means; supplying the hot water to the bathtub through the second pipe;
The pressure detecting means detects a pressure change indicating that the circulation port is submerged; and after detecting the pressure change, water is supplied through the first pipe for a certain period of time. A bath tub comprising: discharging air; measuring a reference pressure with the pressure detecting means; and supplying water to the bath tub through the second pipe to reach a set water level. Water level control method. 4. A water supply source for supplying hot and cold water, a bathtub for storing the hot water from the water supply source, and a water supply source connected to a circulation port formed in the bathtub and the water supply source. A first and a second pipe for supplying the hot water or circulating the hot water between the bathtub and the water supply source;
Flowing water detecting means for detecting the presence or absence of flowing water circulating through a circulation path formed by connecting a pump to the first and second pipes; pressure detecting means for detecting a water pressure acting on the first pipe; A control method for controlling a set water level in the bathtub, comprising: a bathtub water level control method, comprising: supplying water for a predetermined time through the first pipe to fill the first pipe with the hot water; Circulating the hot and cold water in the bathtub through the circulation path, and determining the presence or absence of hot or cold water in the bathtub by detecting running water; Discharging air; supplying the hot water to the bathtub through the second pipe;
The pressure detecting means detects a pressure change indicating that the circulation port is submerged, and after detecting the pressure change, water is supplied for a predetermined time through the first pipe to air in the first pipe. Discharging the water to the outside, measuring the reference pressure by the pressure detecting means, and supplying water to the bathtub through the second pipe to reach a set water level. Bathtub water level control method.