JPH1038367A - Method for judging presence / absence of air in hot water supply system and hot water filling control method - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a method for determining the presence or absence of air accumulation in a return pipe and a method for controlling filling of a bathtub without any variation in filling water level. SOLUTION: A going pipe 3 to a bathtub 2, a returning pipe 4 from the bathtub 2, a circulating pump 6 for forcibly circulating bath water, and a bathtub provided on the circulating pipe and measuring a gauge pressure to measure the gauge pressure. 2, a water level sensor 8 for measuring the water level, a circulation on-off valve 7 for switching the circulation, and a control unit 13 for controlling the entire system, and the detection value of the water level sensor decreases during hot water supply to the bathtub 2. When it is determined that there is an air pocket in the return pipe 4,
Open the circulation on-off valve 7 for a certain time, pour hot water into the return pipe,
The air pool was removed so that the bathtub 2 could be accurately filled with hot water.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for judging presence / absence of air in a hot water supply system for automatically filling a bath tub and a method for controlling filling.

[0002]

2. Description of the Related Art A conventional hot water supply system for automatically filling a bath tub will be described with reference to a block diagram of FIG. In FIG. 9, 1 is a bath water heater and 2 is a bathtub. 3 is an outgoing pipe from the bath water heater 1 to the bathtub 2, 4 is a return pipe from the bathtub 2 to the bath water heater 1, and 5 is a hot water spout connecting the outgoing pipe 3 and the return pipe 4 to the bathtub 2. The bathtub hot water is circulated by 3 and the return pipe 4. 6 is a circulating pump for circulating hot water in the bathtub 2 through the outgoing pipe 3 and the hot water supply return pipe 4, 7 is a circulating two-way valve for switching the circulation, and 8 is a gauge for measuring the water level in the bathtub 2 by measuring the gauge pressure. 9 is a hot water supply pipe for supplying hot water from an electric water heater or the like, 10 is a water supply pipe for supplying water from a water supply or the like, 1
1 is a hot water mixing valve for mixing the hot water from the hot water supply pipe 9 and the water from the water supply pipe 10 at an appropriate temperature, and 12 is a hot water supply electromagnetic valve for supplying the hot tub mixed with the hot water mixing valve 11 to the bathtub 2. 1
Reference numeral 3 denotes a control unit that controls the entire system, and controls the circulation pump 6, the circulation two-way valve 7, the hot and cold water mixing valve 11, and the hot water supply electromagnetic valve 12 when the detection value of the pressure sensor is input.

Next, the operation will be described with reference to the flowchart of FIG. When the set water level h2 to the bathtub 2 is read (S
1), filling is started, the circulation two-way valve 7 of the circulation circuit is opened (S2), and the hot water supply electromagnetic valve 12 is opened (S3). By filling in this state, the outgoing pipe 3 and the return pipe 4
Do hot water from both. At this time, the circulating pump 6 is primed, and the return pipe 4 is filled with hot water.
So that the water level can be measured.

After the priming time (for example, about 2 minutes) elapses (S
4) Close the circulation two-way valve 7 (S5), and switch to hot water supply only from the outgoing pipe 3 (S5). As a result, the hot water flowing to the water level sensor 8 is stopped, and the water level in the bathtub 2 can be accurately measured. Further, the detected pressure of the water level sensor 8 at this time is stored and set as a temporary reference water level (h ₀₀ ) (S6). The current detection pressure of the water level sensor 8 is defined as hx (S7), and when hx rises by a certain water level Δh1 (for example, about 6 cm) (S7).
8), it is determined that the water level of the bathtub 2 has reached the level of the hot water filling port 5 or more, the circulation two-way valve 7 is opened (S9), the hot water supply electromagnetic valve 12 is closed (S10), and the circulation pump 6 is operated (S11). Then, the air pool in the return pipe 4 is removed.

After a lapse of a predetermined time (for example, about 1 minute) (S1
2), the circulation two-way valve 7 is closed (S13), and the water level is measured again by the water level sensor 8. The value obtained by subtracting the rising water level Δh1 from the water level hx detected at this time is defined as the reference water level h0. (S14) Then, the hot water supply electromagnetic valve 12 is opened (S1).
5) While the hot water is being supplied, the detection pressure of the water level sensor 8 is read, and when the detection value of the water level sensor 8 detects hx (h2-h0) (S17), it is determined that the hot water has been filled to the set water level h2, and the hot water supply solenoid valve is provided. 12 is closed (S18), and the hot water supply is stopped (S19).

[0006]

THE INVENTION Problems to be Solved] Thus, the hot water beams of the prior art to tub 2 detects the provisional reference level h _00, to determine the reference water level h0 based on the value, the hot water to the bathtub 2 It was a way to stretch. The problem here is, will detect the pressure at the water level sensor 8 is filled with hot water priming to the circulation pump 6 simultaneously return pipe 4 is performed in order to detect the provisional reference level h _00, at this time, When the return pipe 4 is air reservoir, read the value level sensor 8 is different from the actual pressure, the provisional reference water level h ₀₀ will different from the actual one.

Further, if there is an air pocket in the return pipe 4, since the since the in hot water will move to rise in the piping, the temporary water level reference h ₀₀ of each time the water level sensor 8 varies, bathtub 2 Although the water level is rising, the water level sensor 8 detects that the water level in the bathtub 2 is falling. This phenomenon will be described in detail with reference to FIG.

State 1 in FIG. 11 is a state in which there is no air accumulation in the return pipe 4. At this time, the detection value of the water level sensor 8 reads the pressure difference from the water level sensor 8 to the water surface in the bathtub 2,
The detected value of time is the provisional reference water level h _00. From this state, the rise of the water level in the bathtub 2 is read, and when the water level rises above a certain level (for example, about 6 cm), it is determined that the water level of the bathtub 2 has reached the level of the hot water filling port 5 or more, and the reference water level h0 is determined. . However, if there is an air pocket in the return pipe, as shown in State 2, the detection value of the water level sensor 8 reads the pressure difference from the air pool in the return pipe 4 to the water surface in the bathtub 2. The detected value of the time is the provisional reference level h _01. When hot water is supplied to the bathtub 2 from this state, as the water level in the bathtub 2 rises, the air pool in the return pipe 4 also rises, so the detection value of the water level sensor becomes _h02 shown in state 3, and _h02 is Since the value is smaller than h ₀₁ , even if water is supplied to the bathtub 2 and the water level rises, the detection value of the water level sensor 8 indicates that the water level is falling. As a result, the reference water level h0 cannot be measured accurately, and the final bathtub filling water level varies.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a method for determining the presence or absence of air pockets in a return pipe at the time of filling a bath tub and a method for reliably determining the presence of air pockets. It is an object of the present invention to provide a hot water filling control method capable of accurately measuring a water level and accurately filling a bathtub with no air pockets.

[0010]

A method for determining the presence or absence of air in a hot water supply system according to the present invention comprises the steps of:
It has a return pipe from the bathtub and a water level sensor provided on the return pipe and measuring the water level of the bathtub by measuring gauge pressure.When filling the bathtub, first, hot water is supplied to the bathtub via the return pipe. Then, after hot water is supplied for a certain period of time, the hot water is supplied to the bath tub by switching to the outgoing pipe, and when the water level in the bath tub reaches the set water level, the hot water supply to the bath tub is stopped based on the detection value from the water level sensor. When the detection value of the water level sensor decreases during hot water supply to the bathtub by switching to the outgoing pipe, it is determined that there is an air pocket in the return pipe.

[0011] The hot water filling method of the hot water supply system according to the present invention is characterized in that the water level in the bathtub is measured by measuring gauge pressure provided on the outgoing pipe to the bathtub, the return pipe from the bathtub, and the return pipe. A water level sensor to be measured, a circulation pump for forcibly circulating bath water, a circulation opening / closing valve for switching circulation, and a control unit for controlling the entire system are provided. After hot water is supplied to the bath tub for a certain period of time, hot water is supplied to the bath tub by switching to the outgoing pipe, and when the water level in the bath tub reaches the set water level, water is supplied to the bath tub based on the detection value from the water level sensor. In the hot water supply system that stops the operation, when the detection value of the water level sensor decreases during hot water supply to the bathtub by switching to the outgoing pipe, when it is determined that there is an air pocket in the return pipe, and when it is determined that there is air pocket And a circulation-off valve flowing a hot water for a predetermined time open return the pipe disconnect the air reservoir, in which as by measuring the bath level is performed again hot water filling to the tub.

Further, in the hot water filling method of the hot water supply system according to the present invention, the water level in the bathtub is measured by measuring a pipe going to the bathtub, a return pipe from the bathtub, and a gauge pressure provided on the return pipe. A water level sensor, a circulation pump for forcibly circulating bath water, a switching valve for switching between circulation and hot water supply to the bath, and a control unit for controlling the entire system. First, hot water is supplied to the bathtub via the return pipe, and after a certain period of time, hot water is supplied to the bathtub by switching to the outgoing pipe, and when the water level in the bathtub reaches the set water level, based on the detection value from the water level sensor. In the hot water supply system that stops hot water supply to the bathtub, switching to the outgoing pipe, and when the detected value of the water level decreases during the hot water supply to the bathtub, it is determined that there is an air pocket in the return pipe, and the air pool is present. When it is determined that the switching valve is controlled so that hot water is supplied only from the return pipe, a large amount of hot water is drained to remove the air pool, the bathtub water level is measured again, and the bathtub is filled with hot water. It is.

[0013] The hot water filling method of the hot water supply system according to the present invention is characterized in that the water level of the bathtub is measured by measuring a pipe going to the bathtub, a return pipe from the bathtub, and a gauge pressure provided on the return pipe. A circulating pump for forcibly circulating bath water, a bypass pipe connected in parallel with the circulating pump, a switching valve for switching the circulation and hot water supply paths, and a control unit for controlling the entire system. Prepared,
When filling the bathtub, first supply water to the bathtub via the return pipe, supply water for a certain period of time, then switch to the outgoing pipe and supply water to the bathtub.When the water level in the bathtub reaches the set water level, a water level sensor In the hot water supply system that stops the hot water supply to the bathtub based on the detection value from the tub, it is determined that there is air trapped in the return pipe when the detection value of the water level sensor decreases during the hot water supply to the bathtub by switching to the outgoing pipe. When it is determined that there is an air pool, the switching valve is controlled so that hot water is supplied from the bypass pipe, a large amount of hot water is drained to remove the air pool, the bathtub water level is measured again, and It is intended to be filled with hot water.

Further, in the hot water supply system according to the present invention, in the hot water supply control method, the hot water supply system may further include a pipe resistance increasing section provided in the outgoing pipe to the bathtub, and return pipe from the outgoing pipe side at the time of hot water supply. A large amount of hot water flows on the side.

[0015]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. Embodiment 1 of the present invention will be described. The overall configuration is the same as the conventional configuration shown in FIG. Next, the operation of the first embodiment will be described with reference to the flowchart of FIG. Set water level h2 for bathtub 2
Is read (S20), filling is started, the circulation two-way valve 7 of the circulation circuit is opened (S21), and the hot water supply electromagnetic valve 12 is opened (S22). By filling in this state, filling is performed from both the going pipe 3 and the return pipe 4. At this time,
In addition to priming the circulation pump 6, the return pipe 4 is filled with hot water so that the water level in the bathtub 2 can be measured by the water level sensor 8.

After the priming time (for example, about 2 minutes) has elapsed (S2
3), the circulation two-way valve 7 is closed (S24), and switching to hot water supply from only the outgoing pipe 3 is performed. This stops the hot water flowing to the water level sensor 8 so that the water level in the bathtub 2 can be accurately measured. Further, storing the detected pressure of the water level sensor 8 at this time, the value at this time is temporary reference level h ₀₀ (S25).

The pressure detected by the water level sensor 8 is h
x (S26). While reading whether or not the detected pressure hx of the water level sensor 8 has increased by a certain water level Δh1 (for example, about 6 cm) during hot water supply (S27), if the detected pressure hx of the water level sensor 8 has decreased by a certain water level (for example, about 2 cm) (S2).
8), it is determined that there is an air pocket in the return pipe 4, and the circulation two-way valve 7 is opened again for a predetermined time (for example, about 1 minute) (S3).
0), hot water is allowed to flow in the return pipe 4 to remove the air pool, and after a certain time has elapsed (S31), the circulation two-way valve 7 is closed (S3).
2) Measure the water level in the bathtub 2. Replacing the detected pressure of the water level sensor 8 at this point the temporary reference water level h ₀₀ (S2
9).

When the detection pressure hx of the water level sensor 8 rises by a certain water level Δh1 (for example, about 6 cm) (S33), it is determined that the water level of the bathtub 2 has reached the level of the filling port 5 and the circulation two-way valve 7 is turned on. Open (S34), close the hot water supply electromagnetic valve 12 (S3
5) The circulation pump 6 is operated (S36), and the return pipe 4
Remove the air pocket inside. After a lapse of a predetermined time (for example, about 1 minute) (S37), the circulation two-way valve 7 is closed (S38), and the water level in the bathtub 2 is measured by the water level sensor 8. H detected at this time
A value obtained by subtracting the water level Δh1 corresponding to the rise from the x water level is set as a reference water level h0 (S39).

Thereafter, the hot water supply electromagnetic valve 12 is opened (S4).
0), while the hot water is being supplied, the detection pressure of the water level sensor 8 is read, and when the detection value of the water level sensor 8 detects hx (h2-h0) (S41), it is determined that the hot water has been filled to the set water level h2, and the hot water supply solenoid valve is provided. 12 is closed (S42), and the hot water supply is stopped (S43). By operating as described above, it is possible to suppress the variation in the water level of the bathtub 2 due to the accumulation of air in the return pipe 4, to accurately measure the water level of the bathtub 2, and to accurately fill the bathtub 2. it can.

Embodiment 2 Next, Embodiment 2 of the present invention
explain about. FIG. 2 shows an overall configuration diagram of Embodiment 2 of the present invention. In FIG. 2, 1 is a bath water heater and 2 is a bathtub. 3 is a hot water supply pipe from the bath water heater 1 to the bath tub 2, 4 is a hot water supply return pipe from the bath tub 2 to the bath water heater 1, 5 is a hot water spout connecting the outgoing pipe 3 and the return pipe 4 to the bath tub 2, Bathtub hot water is circulated through bathtub going pipe 3 and bathtub return pipe 4. 6 is a circulation pump, 14 is a three-way valve for switching between hot water supply and circulation, and 8 is a water level sensor. 9 is a hot water supply pipe for supplying hot water from an electric water heater or the like, 10 is a water supply pipe for supplying water from a water supply or the like, and 11 is a mixing valve for mixing hot water from the hot water supply pipe 9 and water from the water supply pipe 10 at an appropriate temperature. , 12 are hot water supply solenoid valves for supplying hot water mixed by the mixing valve 11 to the bathtub, and 13 is a control unit for controlling the whole system.

Next, the operation of the second embodiment will be described with reference to the flowchart of FIG. 3 and the state diagram of the three-way valve 14 of FIG. When the set water level h2 to the bathtub 2 is read (S5
0), filling is started, the three-way valve 14 is in the state 1 in FIG. 4 (S51), and the hot water supply electromagnetic valve 12 is opened (S52). By performing filling in this state, first, filling is performed from both the outgoing pipe 3 and the return pipe 4. At this time, the circulating pump 6 is primed and the return pipe 4 is filled with hot water so that the water level in the bathtub 2 can be measured by the water level sensor 8.

After the priming time (for example, about 2 minutes) has elapsed (S5
3), the three-way valve 14 becomes the state 2 in FIG. 4, and the hot water is supplied only from the outgoing pipe 3 (S54). This stops the hot water flowing to the water level sensor 8 so that the water level in the bathtub 2 can be accurately measured. Further, storing the detected pressure of the water level sensor 8 at this time, the value at this time is temporary reference level h ₀₀ (S5
5. Further, the detected pressure of the water level sensor 8 is set to hx (S57). While reading whether or not the detected pressure hx of the water level sensor 8 rises by a certain water level Δh1 (for example, about 6 cm) during hot water supply (S57), if the detected pressure hx of the water level sensor 8 drops by more than a certain value Δh2 (for example, about 2 cm) ( S5
8), it is determined that there is an air pocket in the return pipe 4, and the three-way valve 14 is set to the state 3 in FIG. 4 for a certain period of time (for example, about 1 minute) (S60). The air pool in the return pipe 4 is drawn out by flowing, and after a lapse of a predetermined time (S61), the three-way valve 14 is set to the state 2 in FIG. 4 and hot water is supplied from the going pipe 3 (S62). Is measured. Replacing the detected pressure of the water level sensor 8 at this point the temporary reference water level h ₀₀ (S59).

When the pressure hx detected by the water level sensor 8 rises by a certain water level Δh1 (for example, about 6 cm) (S63), it is determined that the water level of the bathtub 2 has reached the level of the filling port 5 and the three-way valve 14 is turned on in FIG. (S64), the hot water supply electromagnetic valve 12 is closed (S65), the circulation pump 6 is operated (S66), and the air pool in the return pipe 4 is removed. After a predetermined time (for example, about 1 minute) has elapsed (S67), the three-way valve 14 is set to the state 2 in FIG. 4 (S68), and the water level sensor 8 measures the water level of the bathtub 2. The value obtained by subtracting the rising water level Δh1 from the water level hx detected at this time is the reference water level h0.
(S69).

Thereafter, the hot water supply electromagnetic valve 12 is opened (S7).
0), the pressure detected by the water level sensor 8 is read while hot water is supplied, and when the detected value of the water level sensor 8 detects hx (h2-h0) (S71), it is determined that the set water level h2 has been applied.
The hot water supply electromagnetic valve 12 is closed (S72), and the hot water supply is stopped (S73). By operating in this manner, the air pool can be further removed, so that the variation in the water level measurement due to the air pool can be further suppressed, and the water level in the bathtub 2 can be accurately measured. Can be done accurately.

Embodiment 3 Embodiment 3 of the present invention will be described. FIG. 5 is an overall configuration diagram showing Embodiment 3 of the present invention. In FIG. 5, the second embodiment shown in FIG.
The same reference numerals denote the same or corresponding parts, and a detailed description thereof will be omitted. Reference numeral 15 denotes a bypass pipe connected in parallel with the circulation pump 6, and reference numeral 16 denotes a three-way valve for switching between the circulation pump 6 and the bypass pipe 15.

Next, the operation of the third embodiment will be described with reference to the flowchart of FIG. 6 and the state diagram of the three-way valve of FIG. When the set water level h2 to the bathtub 2 is read (S80),
Filling is started, the three-way valve 16 is brought to the state 1 in FIG. 7 (S81), and the hot water supply electromagnetic valve 12 is opened (S82). By performing filling in this state, first, filling is performed from both the outgoing pipe 3 and the return pipe 4. At this time, the circulating pump 6 is primed and the return pipe 4 is filled with hot water so that the water level in the bathtub 2 can be measured by the water level sensor 8.

After the priming time (for example, about 2 minutes) has elapsed (S8
3), the three-way valve 16 is in the state 2 in FIG. 7, and hot water is supplied only from the outgoing pipe 3 (S84). This stops the hot water flowing to the water level sensor 8 so that the water level in the bathtub 2 can be accurately measured. Further, storing the detected pressure of the water level sensor 8 at this time, the value at this time is temporary reference level h ₀₀ (S8
5. Then, the detected pressure of the water level sensor 8 is set to hx (S86). Detected pressure hx of water level sensor 8 during hot water supply
While reading whether or not the water level rises by a constant water level Δh1 (for example, about 6 cm) (S87), the detection pressure hx of the water level sensor 8 is detected.
Falls below a certain value Δh2 (for example, about 2 cm) (S
88), it is determined that there is an air pocket in the return pipe 4, and the three-way valve 16 is set to the state 3 in FIG. 7 for a certain period of time (for example, about 1 minute) (S90). By flowing hot water through the bypass pipe 15 with low pipe resistance,
A lot of hot water can flow in the return pipe 4, and the return pipe 4
Remove the air pocket inside. After a lapse of a predetermined time (S91), the three-way valve 16 is set to the state 2 in FIG. 7, hot water is supplied from the outgoing pipe 3 (S92), and the water level of the bathtub 2 is measured. Replacing the detected pressure hx of the water level sensor 8 at this point the temporary reference water level h ₀₀ (S89).

When the pressure detected by the water level sensor 8 rises by a certain level hx (for example, about 6 cm) hx (S93), it is determined that the water level in the bathtub 2 has reached the level of the filling port 5, and the three-way valve 16 is turned on in FIG. (S94), the hot water supply electromagnetic valve 12 is closed (S95), the circulation pump 6 is operated (S96), and the air pool in the return pipe 4 is removed. After a lapse of a predetermined time (for example, about 1 minute) (S97), the three-way valve 16 is set to the state 2 in FIG. 7 (S98), and the water level of the bathtub 2 is measured by the water level sensor 8. The current water level h detected at this time
The value obtained by subtracting the rising water level Δh1 from x is the reference water level h.
It is set to 0 (S99).

Thereafter, the hot water supply electromagnetic valve 12 is opened (S10).
0), the pressure detected by the water level sensor 8 is read while hot water is supplied, and when the detected value of the water level sensor 8 detects hx (h2−h0) (S101), it is determined that the hot water has been filled up to the set water level h2, and the hot water supply solenoid valve is provided. 12 is closed (S102), and the hot water supply is stopped (S103). By operating in this way,
Air can be prevented from remaining in the return pipe 4 at the time of priming of the circulation pump 6, there is no variation in water level measurement due to air pools, and the water level in the bathtub 2 can be accurately measured. Tension can be performed accurately.

Embodiment 4 FIG. 8 is an overall configuration diagram showing Embodiment 4 of the present invention. In FIG. 8, reference numeral 17 denotes a conduit resistance increasing portion which is configured to bend upward in the middle of the going pipe 3 to increase the conduit resistance.

In the fourth embodiment, the pipe resistance increasing portion 17 is provided by bending the middle of the outgoing pipe 3 to the bathtub 2 upward, so that at the first filling, the outgoing pipe 3 side Also, as much water as possible flows toward the return pipe 4 side, it becomes difficult for air to accumulate in the return pipe 4 and the variation of the water level measurement is suppressed, so that the water level of the bathtub 2 can be accurately measured, and Hot water filling can be performed accurately. The pipe resistance increasing portion 17 of the outgoing pipe 3 can also be configured by reducing the inner diameter of the pipe.

[0032]

As described above, according to the present invention, when the detection value of the water level sensor decreases during hot water supply to the bathtub, it is determined that there is an air pocket in the return pipe. Can be determined accurately.

Further, according to the present invention, when it is determined by the above-described determination method that there is an air pocket in the return pipe, the circulation opening / closing valve is opened for a predetermined time, and hot water is allowed to flow in the return pipe to remove the air pocket. Since the water is extracted, the water level in the bathtub can be accurately measured, and the bathtub can be filled with water accurately.

According to the present invention, when the detection value of the water level sensor decreases during hot water supply to the bathtub and it is determined that air remains in the return pipe, the switching valve is turned on only from the return pipe for a predetermined time. And the air pool is extracted by flowing as much water as possible to the return pipe, so that the bathtub water level can be measured more accurately, and the bathtub can be filled more accurately.

Further, according to the present invention, when the value detected by the water level sensor decreases during hot water supply to the bathtub and it is determined that air is trapped in the return pipe, a large amount of hot water is supplied from the bypass pipe that bypasses the circulation pump. To the return pipe so that the air pool is reliably removed in a short time, so that the bathtub can be filled with water more accurately.

Further, according to the present invention, a pipe resistance increasing portion is provided in the middle of the outgoing pipe to the bathtub so that a larger amount of hot water is supplied to the return pipe side than the outgoing pipe side at the time of the first filling. Since the air is made to flow, it is difficult for air to accumulate in the return pipe 4, and an accurate reference water level can be detected.

[Brief description of the drawings]

FIG. 1 is an operation flowchart according to a first embodiment of the present invention.

FIG. 2 is an overall configuration diagram of Embodiment 2 of the present invention.

FIG. 3 is an operation flowchart according to the second embodiment of the present invention.

FIG. 4 is a state diagram of a three-way valve according to Embodiment 2 of the present invention.

FIG. 5 is an overall configuration diagram of a third embodiment of the present invention.

FIG. 6 is an operation flowchart according to the third embodiment of the present invention.

FIG. 7 is an operation state diagram of a three-way valve according to Embodiment 3 of the present invention.

FIG. 8 is an overall configuration diagram of Embodiment 4 of the present invention.

FIG. 9 is an overall configuration diagram of Embodiment 1 of the present invention and a conventional hot water supply system.

FIG. 10 is a conventional operation flowchart.

FIG. 11 is an explanatory diagram showing a water level measurement method.

[Explanation of symbols]

2 bathtub, 3 outgoing pipe, 4 return pipe, 6 circulation pump, 7 circulation 2 way valve, 8 water level sensor, 11 hot water mixing valve, 12 hot water supply solenoid valve, 13 control unit, 15 bypass pipe, 14 three way valve, 16 three way valve , 17 Pipe resistance increase section.

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Masakatsu Nakayama 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Fumihiko Nakajima 2-3-2 Marunouchi, Chiyoda-ku, Tokyo 3 (72) Inventor Shinichi Tomoda 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Sanishi Electric Co., Ltd.

Claims (5)

[Claims] 1. A bathing system for a bathtub, comprising: a pipe going to a bathtub, a return pipe from the bathtub, and a water level sensor provided on the return pipe and measuring a gauge level to measure a water level in the bathtub. At first, hot water is supplied to the bathtub via the return pipe, and after a certain period of time, the hot water is supplied to the bathtub by switching to the outgoing pipe, and when the water level in the bathtub reaches the set water level, the detected value from the water level sensor is used. In the hot water supply system for stopping hot water supply to the bathtub based on the switching to the outgoing pipe, when the detection value of the water level sensor decreases during hot water supply to the bathtub, it is determined that there is an air pocket in the return pipe. Method for determining the presence or absence of air pockets in a hot water supply system. 2. A pipe for going to the bathtub, a return pipe from the bathtub, a water level sensor provided on the return pipe for measuring a water level of the bathtub by measuring a gauge pressure, and for forcibly circulating the bathtub hot water. A circulation pump, a circulation opening / closing valve for switching circulation, and a control unit for controlling the entire system. When hot water is supplied to the bathtub, the hot water is first supplied to the bathtub via the return pipe, and then supplied for a certain period of time. In the hot water supply system that switches to the outgoing pipe and supplies hot water to the bathtub, and when the water level in the bathtub reaches the set water level, the hot water supply system stops the hot water supply to the bathtub based on the detection value from the water level sensor. When the detection value of the water level sensor decreases during hot water supply to the bathtub, it is determined that there is an air pool in the return pipe, and when it is determined that there is air pool, the circulation on-off valve is opened for a certain period of time and hot water is stored in the return pipe. Shed A hot water filling method for a hot water supply system, comprising: removing an air pocket, measuring the bathtub water level again, and filling the bathtub. 3. A pipe for going to the bathtub, a return pipe from the bathtub, a water level sensor provided on the return pipe for measuring a water level of the bathtub by measuring a gauge pressure, and for forcibly circulating the bathtub hot water. A circulating pump, a switching valve for switching between circulation and hot water supply to the bathtub, and a control unit for controlling the entire system. When hot water is supplied to the bathtub, the hot water is first supplied to the bathtub via the return pipe. After supplying water for a certain period of time, the hot water is supplied to the bathtub by switching to the outgoing pipe, and when the water level of the bathtub reaches the set water level, the hot water supply system for stopping the hot water supply to the bathtub based on the detection value from the water level sensor, When switching to the outgoing pipe, when the detection value of the water level sensor decreases during hot water supply to the bathtub, it is determined that there is an air pocket in the return pipe, and when it is determined that there is air pool, the above switching valve is set to return pipe only. Or A method of controlling hot water supply in a hot water supply system, comprising controlling hot water supply, flowing a large amount of hot water, removing an air pocket, measuring the bathtub water level again, and filling the bathtub. 4. A pipe for going to the bathtub, a return pipe from the bathtub, a water level provided on the return pipe for measuring a water level in the bathtub by measuring a gauge pressure, and for forcibly circulating the bathtub hot water. A circulation pump, a bypass pipe connected in parallel with the circulation pump, a switching valve for switching a circulation and hot water supply path, and a control unit for controlling the entire system,
When filling the bathtub, first supply water to the bathtub via the return pipe, supply water for a certain period of time, then switch to the outgoing pipe and supply water to the bathtub.When the water level in the bathtub reaches the set water level, a water level sensor In the hot water supply system that stops hot water supply to the bathtub based on the detection value from the tub, switching to the outgoing pipe, and when the detection value of the water level sensor decreases during hot water supply to the bathtub, it is determined that there is air accumulation in the return pipe. When it is determined that there is an air pocket, the switching valve is controlled so as to supply hot water from the bypass pipe, a large amount of hot water is supplied to drain the air pocket, the bathtub water level is measured again, and A filling control method for a hot water supply system, characterized in that filling is performed. 5. The hot water filling method according to claim 1, wherein a pipe resistance increasing portion is provided in a pipe going to the bathtub, and a large amount of hot water is supplied to the return pipe side rather than the going pipe side at the time of hot water supply. The hot water filling method for a hot water supply system according to claim 2.