JPH02306050A - Control method for hot water supply to bath and supplemental bath water heating device - Google Patents

Abstract

PURPOSE:To prevent the temperature of hot water in the bath tub from dropping so as to allow a comfortable bathing by operating the supplemental bath water heating device when filling water in the bath tub until the temperature of hot water in the bath tub reaches the set temperature, and repeating the process when replenishing supplemental hot water in which the temperature of hot water in the bath tub is raised to the set temperature by the supplemental bath water heating device after a small amount of water is added. CONSTITUTION:When the hot water replenishing switch 98 is switched on, the set amount of hot water to be replenished V set by the hot water replenishing amount setting unit 99c and the set hot water temperature T set by the bath water temperature setting unit 99b are entered, and, based on the value of V, the number of repetition N is computed. The solenoid valve 38 is then opened, and, after supplying a predetermined amount of hot water is supplied, the solenoid valve 38 is closed. The circulation pump 72 is then started, and, after performing the supplemental heating until the temperature of hot water in the bath tub 10 reaches the set temperature T, the circulation pump 72 is stopped, which completes the supplemental heating. The cycle of adding a small amount of hot water and performing a supplemental heating is repeated until the number of repetition reaches the number N.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method of controlling a hot water supply and reheating device for a bathtub, and particularly to a hot water supply and reheating device for a bathtub that prevents a drop in the temperature of hot water in the bathtub. Concerning a control method.

[Prior Art] Conventionally, automatic water heaters have been used that automatically supply a predetermined amount of hot water into a bathtub to fill the bathtub or add hot water to the bathtub. In addition, a reheating device for a bathtub is used in which water (or water) in the bathtub is extracted from the circulation stream, heated by a heating device, and returned to the bathtub via a circulation return port.

[Problems to be Solved by the Invention] Conventional automatic water heaters have been designed to maintain an appropriate temperature for bathing (e.g.
The bathtub is supplied with hot water at a slightly lower temperature (for example, 38 to 39 degrees Celsius) than the bathtub.

For this reason, even if a predetermined amount of hot water is stored in the bathtub using, for example, a metered water stop mechanism, the water is still a little lukewarm, making it unsuitable for taking a bath.

Further, there is also a problem in that the temperature of the water in the bathtub decreases even when the bathtub is filled with water in large quantities.

[Means for Solving the Problems] The present invention relates to a hot water supply device that supplies hot water to a bathtub, and a method of controlling a reheating device that reheats hot water in the bathtub.

In the present invention, when hot water is filled with the hot water supply device, the reheating device is operated until the temperature of the water in the bathtub reaches the set temperature.

In addition, in the present invention, when adding the required amount of hot water using the hot water supply device, the process of repeatedly adding a small amount of hot water and then raising the temperature of the water in the bathtub to the set temperature using the reheating device is repeated. Do a foot bath.

[Function] According to the method of the present invention, reheating is performed after the hot water is filled, and the temperature of the water in the bathtub is raised to a temperature suitable for bathing.

Also, when performing a supplementary bath, after a small amount of thirst is added, the temperature of the water in the bathtub is raised to an appropriate temperature, and this is repeated multiple times to obtain the target amount of supplementary bath. The temperature of the water decreases little during the bath, and the water temperature in the bathtub returns to an appropriate temperature after the bath is filled with water.

[Example] Examples will be described below with reference to the drawings.

FIG. 1 is a system diagram showing a bathtub heating and reheating device suitable for carrying out the present invention.

In FIG. 1, reference numeral 10 is a bathtub, to which a water heater and reheating device are connected.

Reference numeral 12 indicates a water heater. Water is provided by water supply port 14 and water supply pipe 16
, a pressure reducing check valve 1 with a safety valve installed in the middle of the water supply pipe
7. The hot water is introduced into the heating tank 22 in the water heater 12 through the branch port 18 and the water supply pipe 20, and heated by the heating means 24, which includes a burner, a fan, etc., to become high-temperature hot water. A portion of this hot water can be supplied from the hot water outlet 28 to places of demand such as a bathroom shower and a kitchen. In addition, heating tank 2
The hot water from No. 2 is passed through a hot water outlet 30 and a hot water pipe 32 to a mixing valve 34.
and the water sent through the water supply pipe 36 and the appropriate temperature (
For example, after mixing at 40°C, the solenoid valve 38 and the check valve 4
2. Hot water pipe with flow rate sensor 40 (common hot water pipe)
44.

The hot water supply pipe 44 is a hot water supply pipe (branched hot water pipe) 46.48 from the middle
The 0-branch water supply pipe 46 is connected to the horizontal pipe 5 via a check valve 50, a three-way joint 52 of the pipe 46a1, and a pipe 53.
It is connected to a three-way joint 54 in the middle of 6. Horizontal piping 5
6 is for taking hot water out of the water heater casing 57, and a three-way joint 58 is provided so that hot water can be taken out from either side of the casing 57 (the left and right sides in the figure).
．． 60 are provided at both ends. In this embodiment, the three-way joint 60 is sealed with a blind plug or the like. The horizontal pipe 56 is connected to the bathtub 10 via the pipe 62 on the three-way joint 58 side.
It is connected to the circulation spout 64 of.

The branch hot water supply pipe 48 is connected to a three-way joint 74 in the middle of the horizontal pipe 76 via a check valve 66, a three-way joint 68 of the pipe 48a1, and a pipe 70. This horizontal pipe 76 is also provided with three-way joints 78 and 80 at both ends, so that hot water can be tapped from either side of the casing 57. Note that a circulation pump 72 is provided in the middle of the piping 70 close to the three-way joint 74. The horizontal pipe 76 is connected to the pipe 8 on the side of the three-way joint 78.
2 to the circulation return port 84 of the bathtub 10.

The three-way joint 80 is sealed with a blind plug.

A piping 86 is connected to the three-way joint 52, and this piping 86 is connected to an inlet 88a of a heating tube 88 disposed within the heating tank 22.

An outlet 88b of the heating tube 88 is connected to the three-way joint 68 via a pipe 92.

Note that the bathtub 10 is installed at a level above the three-way joints 58 and 78.

A controller 94 is provided in the bathroom. The controller 94 is provided with a hot water level switch 96, a hot water replenishment switch 98, a hot water level setting device 99a, a hot water bath temperature setting device 99b, and a hot water amount setting device 99c. is input to the control device 100 of. Note that detection signals from the flow rate sensor 40 and a temperature detector (thermistor in this embodiment) 102 for detecting water temperature provided in the three-way joint 54 are also input to the control device 100. The control device 100 outputs control signals to the electromagnetic valve 38 and the bomb 2.

Note that the control device 100 is a microcomputer.

The sensor 40 is configured mainly around a viator.
, 102 are converted into digital signals by an A/D converter and input to the micro combinator. Control signals from the microcomputer are outputted as actuation signals via appropriate relays as necessary. The microcomputer itself is well known, and includes a ROM that stores programs,
RAM, which temporarily stores data, central processing unit (c
pu), data bus, etc. ROM
The program contents stored in are shown in detail in FIG. 3, which will be described later.

A heater 104.106 is provided in the horizontal pipe 56.76. These heaters 104 and 106 are for preventing freezing.

In the apparatus shown in FIG. 1 constructed in this manner, when the hot water filling switch 96 is pressed, the solenoid valve 38 is opened. As a result, the hot water from the water heater 12 is supplied to the mixing valve 34, for example, by 3 times.
After the hot water is at a temperature of 8°C, the common hot water supply pipe 44 or the hot water supply pipes 46, 48 of the 62 system (further pipes 46a, 53, 56.
62 & piping 48a, 70.76.82)
You can quench your thirst by supplying it to 0. Note that when the pump 72 is stopped, water (dry water) flows directly through the pump 72.

In this device, the amount of hot water supplied to the bathtub 10 through a hot water supply pipe 44 is detected by a flow rate sensor 40. In the control device 100, when the total amount of hot water supplied reaches the amount set by the hot water level setting device 99a, the solenoid valve 38 is operated to close.
Hot water supply is stopped.

(In the above device, the amount of hot water supplied to the bathtub 10 is detected by the flow rate sensor 40, but in the present invention, the water level in the bathtub 10 may be detected by an appropriate sensor such as a pressure switch.) After finishing, the pump 72 is activated and the bathtub 10
The hot water inside is circulation Zainichi 64, piping 62.56.53.86,
Tube 60, piping 92.70, pump 72, piping 76
．． 82, it is circulated through a circulation return port 84 and heated in a chave 88 along the way. Therefore, bath 4ff1
You can reheat the hot water inside the room. In addition, this reburning is
It is automatically stopped when the temperature detected by the temperature detector 102 reaches the temperature set by the bathtub hot water temperature setting device 99b (for example, 42° C.).

When the replenishment switch 98 is pressed, the amount of hot water set by the replenishment hot water amount setting device 99c is supplied to the bathtub 10 as additional hot water. A fire is made. That is, as shown in FIG. 2, first, the solenoid valve 38 is opened for a short period of time, and a small amount of hot water is added to the bathtub 10. As a result, the temperature of the water in the bathtub 10 decreases a little, so reheating is performed until the temperature of the water in the bathtub 10 reaches the temperature set by the bathtub water temperature setting device 99b (the operation during this reheating is as described above). It is the same as when refiring.

), after the bathtub water temperature reaches the set temperature, a small amount of hot water is added again, and then reheating is performed again until the set temperature is reached. This cycle of adding a small amount of hot water and reheating is repeated until the total amount of hot water reaches the amount set by the hot water amount setting device 99c.

Note that the two-dot chain line in Figure 342 shows the change in hot water temperature when using the conventional hot water addition method. In the conventional method, a target amount of hot water is added to the bathtub all at once, resulting in a significant drop in the temperature of the water inside the bathtub. On the other hand, in the method of the present invention, supplementary bathing and reheating are performed frequently, and the range of decrease in the temperature of the hot water in the bathtub is extremely small.

This device uses tap water supply pressure to directly supply hot water from the water heater 12 to the bathtub 10, eliminating the need for a conventional hot water supply pump or receiver tank.

In addition, since hot water is supplied through two systems of hot water piping,
Even if the flow path length is large, a large amount of hot water can be rapidly supplied. Therefore, hot water can be quickly poured into the bath.

Since the apparatus shown in FIG. 1 is provided with check valves 42, 50, 66, hot water downstream of the check valve 50, 66 will not flow back toward the water pipe.

In particular, in this embodiment, the check valves 42 and 50 are arranged in series, and the check valves 42, 66 are also arranged in series, so that backflow is reliably prevented.

In addition, in the apparatus shown in FIG. 1, freezing can be prevented by draining water from the main part of the pipe as follows. That is, when the pump 72 is operated in a state where there is no water in the bathtub 10, the portion between the three-way joint 58 and the three-way joint 54 among the piping 62 and the horizontal piping 56, and the piping 5
3. Piping 86, tube 88, piping 92, and piping 7
0, the water on the upstream side of the pump 72 is immediately drained into the bathtub I.
Flows into O. The pump 72 will not operate when there is no water on the upstream side, so the pump 72
Water will remain on the downstream side, but the horizontal pipes 56, 76 are heated by heaters 104, 106 to prevent freezing. (Although these heaters 104 and 106 are automatically turned on and off by bimetal switches, they may also be configured to output control signals from the control device 100 based on the detected value of the air temperature sensor.) The three-way joint 52 and Water is difficult to drain from the pipe 46a between the check valve 5o and the pipe 48a between the three-way joint 68 and the check #66 even when the pump 72 is operated. However, in the apparatus of FIG. 1, the three-way joints 52, 68 are located close to the check valves 50, 66, and the pipes 46a, 48a are extremely short. Therefore, the water in these pipes 46a and 48a is transferred to the pipe 5.
3.70, and almost no water remains in the pipes 46a, 48a. In the unlikely event that residual water leaks from pipe 46
Even if it freezes in the pipes 46a and 48a, it will not freeze to the extent that the pipes 46a and 48a will become clogged with ice.
It is not necessary to provide antifreeze heaters in 6a and 48a.

Next, a method for automatically controlling the hot water supply and reheating device will be described with reference to FIG.

When the refill switch 98 is turned on, the refill hot water amount setting device 9
Read the set additional hot water amount V of 9c and the set hot water temperature T of the bathtub hot water temperature setting device 99b, and then calculate the number of repetitions N from this V value.
Calculate. In this example, the amount of hot water added per time is 10
a, and the number of repetitions N is calculated as N-V/10. (It should be noted that this 10J2 is an example value, and it is clear that other amounts (for example, 51 or 20°C) may be used in the present invention.) Next, the solenoid valve 38 is opened, and a predetermined amount (in this embodiment) is used. In the example, tO
X) after the water is supplied (this supply amount is determined by the flow rate sensor 40
Detected at ), the solenoid valve 38 is closed. Next, the circulation pump 72 is operated to perform reheating until the water temperature in the bathtub 10 (the temperature detected by the thermistor 102) reaches the set water temperature T, and then the circulation bomb 2 is stopped to end the reheating. This cycle of adding a small amount of hot water and reheating is repeated until the number of repetitions is N.

In the program shown in Figure 3, reheating starts (step A
After starting the operation of the circulation pump 72 in step C, the temperature detected by the thermistor 102 is read,
This detected temperature is compared with the set temperature of the bathtub hot water temperature setting device 99b in step D. Immediately after the circulation pump 72 starts operating, the hot water stays in the piping 56, 62 for a long time and becomes very hot. The hot water, which has reached a certain temperature, flows through the thermistor 102. Therefore, in this embodiment, after the circulation pump 72 starts operating in step A, there is a wait for a certain period of time (1 minute in this example) in step B, and the circulating water from inside the bathtub 10 comes into contact with the thermistor 102. After that, the temperature detected by the thermistor 102 is read.

In the control example shown in Fig. 3, the total amount of hot water added V is converted into the amount of hot water added at one time (
The number of repetitions N was calculated by dividing by 10j2), but in this example, the number of repetitions N was calculated so that the decrease in water temperature due to the addition of - times was within the required range (for example, within 1°C).
may be determined. An example of this determination method will be described next.

This method is based on the temperature in the bathtub to (this temperature t.

is detected by the thermistor 102. ) The temperature drop Δt obtained by adding an amount V of hot water at a temperature t (for example, 38° C.) to the thirst amount S is calculated, and the number of repetitions N is determined according to this Δt. This Δt is calculated using the following formula.

(The second term on the right side is the temperature of the water in the bathtub after the end of reheating when reheating is not performed.) If the number of repetitions N is set as follows according to this Δt, one reheating The temperature drop associated with the cycle (small amount of supplementation) is within 1°C.

When Δt≦1℃ N=1 When Δt≦2℃ N−2 When Δt≦ (m+1)t: Nxm+1 The amount of water S in the bathtub above is determined from the setting value of the hot water filling setting device 99a. It can be found by reading. In addition, bathtub 1
In order to detect the amount of water actually present in the bathtub 10, a water amount detection sensor in the bathtub 10, such as a water pressure sensor, may be used.

In the above calculation method for N, the temperature inside the bathtub 10 is detected by the thermistor 102, but instead, the hot water temperature set by the bathtub hot water temperature setting device 99b is treated as the hot water temperature inside the bathtub 10. Also good. (In other words, in this case, in the above-mentioned lower temperature calculation formula (1), the set temperature 1+ by the bathtub hot water temperature setting device 99b may be substituted for to.) In the present invention, instead of the above-mentioned formula (1), The following equation (2) may be used.

Yu□-51-Mad Poo''-''Uni and 00. (2) Here, X is the amount set by the hot water setting device 99a, and y is the amount of hot water set by the hot water amount setting device 99c. Further, as described above, tl is the temperature set by the bathtub water temperature setting device 99b, and t is the temperature of the additional hot water. This equation (2) is
When the amount of hot water in the bathtub decreases by an amount y from the set hot water filling amount X and reaches the current amount (x-y), supply y amount of additional hot water to bring the amount of hot water in the bathtub to X. This is assuming that you are trying to do so.

In the present invention, a bubble jetting nozzle may be attached to the circulation return port 84 to form a bubble bathtub.

In this case, a bypass pipe that short-circuits the pipe 86 and the pipe 92 may be provided to circulate a large amount of hot water during the bubble jetting operation.

In the apparatus shown in FIG. 1, two hot water supply routes are used for filling and adding hot water, but in the present invention, hot water filling and adding hot water may be performed using one hot water supply route.

[Effects of the Invention] As described above, according to the method of the present invention, it is possible to prevent a decrease in the bathtub water temperature and to enjoy a comfortable bath.

[Brief explanation of the drawing]

FIG. 1 is a system diagram showing a bathtub hot water supply and reheating device. FIG. 2 is a diagram showing changes in hot water temperature, and FIG. 3 is a flowchart showing a control method. 10... Bathtub, 12... Water heater, 42.
50, 66... Check valve, 84... Circulation return port, 64... Circulation spout, 94...
...Controller, 96...Thirst switch, 98.
...Easy addition switch, 100...Control device, 102...Temperature detector (thermistor).

Claims (1)

[Claims] (1) In a method for controlling a hot water supply device that supplies hot water to a bathtub and a reheating device that reheats hot water in the bathtub, when the hot water supply device is used to fill hot water, the reheating device continues until the temperature of the water in the bathtub reaches the set temperature. When the hot water supply device is activated to add the required amount of hot water, the process of adding a small amount of hot water and then raising the temperature of the water in the bathtub to the set temperature with the reheating device is repeated, thereby adding the required amount of hot water. A method of controlling a hot water supply and reheating device for a bathtub, characterized by performing the following steps.