JPH02275245A - Automatic hot water filling apparatus of bathtub - Google Patents

Abstract

PURPOSE:To ensure a high accuracy in measuring a hot water level in a bathtub filled with hot water by a method wherein the detection of the hot water level is made only when an output value from a hot water level sensor with respect to time varies in a range of 0 to 20cm/min in term of a hot water level in the bathtub or a hot water level rising speed in the bathtub at the time of the detection of output variations corresponding to the submergency of a bath adaptor. CONSTITUTION:In a case where a hot water stream switch 16 connected to the outlet port 15 of a pump 13 is kept ON continuously for a fixed period of time, hot water is judged to be in a residual state, and whether the hot water level in a bathtub is higher than a preset hot water level is judged. In a case where it is higher than the preset hot water level, additional heating and temperature holding operations are carried out. In a case where no residual state of water is judged, a shut-off valve 24 is opened to feed hot water into the bathtub 19 for a predetermined period of time through pipelines 18, 23, and thereafter, the shut-off valve 24 is closed to feed hot water into the bathtub 19 through the pipeline 18. According to this hot water feed method, when an output value from a hot water sensor 22 provided on a pipeline 21 becomes DELTAv0 in a range of 0 to 20cm/min, a three-way change- over valve 12 is operated to form a circulation passage for additional heating, and supplied hot water is circulated.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application Field The present invention relates to an automatic bath water filling device that can accurately and reliably fill hot water even when hot water is supplied from a high place.

(b) Conventional technology Traditionally, as one method for automatically filling a bath with hot water, an automatic bath hot water filling device has been used, which is equipped with a bath reheating circuit equipped with a pump and a bath dropping circuit connected to the reheating circuit. A water level sensor is installed in the bath return piping of the bath reheating circuit, and while hot water is being supplied to the bath from the bathtub through the bath piping, the water level in the bath is detected by the water level sensor, and hot water is filled based on the detected value. There is a way.

In this method, since the bath and water level sensor are separated, it is important to accurately detect the bath water level.

Therefore, it is necessary to use a water level sensor to detect that hot water has reached the top of the bath adapter, and then use a reheating circuit to fill water from the bath to the bath return pipe where the water level sensor is located.

Further, filling of hot water to a set water level is performed using the output value of the water level sensor after filling the bath return pipe with water as a reference (reference water level).

That is, based on the water level reaching the top of the bath adapter, hot water is supplied by the above-mentioned method based on the difference between the set water level and the water level.

If the method described above is adopted, hot water can be automatically filled regardless of the installation position of the bath, and it is possible to avoid forgetting to adjust the reference water level when installing the bath, and the hassle of adjusting it.

Figure 3 shows changes in the output of the water level sensor using the above method.

That is, when the water rises upward by the bath adapter, the water level sensor output rises, the rising output Δv0 is detected, and then the hot water is circulated by the reheating circuit to fill the bath return piping to which the water level sensor is attached, Using the value at that time as a reference water level, hot water is supplied based on the difference Δv1 from the set water level.

(c) Problems to be Solved by the Invention However, as a result of research by the present applicant, in the above-mentioned bath automatic hot water filling method, the rising output Δv0 with respect to time when hot water rises above the bath adapter is It has been found that there are significant changes depending on the piping method of the piping, the bath return piping, the presence or absence of hot water in the bath return piping, etc.

In particular, as shown in FIG.
When the hot water rises further, the hot water in the bath 52 returns to the bath return pipe 50.
flows backwards, the output suddenly rises, and the water level sensor 53 quickly detects Δv0.

However, at this time, the bath return pipe 50 is not sufficiently filled with hot water, and the hot water is V&circled by the reheating circuit. Therefore, the pump 54 sucks air and hot water at the same time, and air remains in the bath return pipe, making it impossible to fill it with water and making it impossible to detect an accurate reference water level. Note that 55 is a water heater.

An object of the present invention is to provide an automatic bath water filling device that can solve the above problems.

(d) Means for Solving the Problems The present invention comprises a bath reheating circuit equipped with a pump and a bath drop-in circuit connected to the reheating circuit, and a bath return piping of the bath reheating circuit is connected to the bath reheating circuit. A water level sensor is installed, and when the output change of the water level sensor reaches a value equivalent to submerging the bath adapter, the bath return piping is filled with hot water by circulating the pump in the bath reheating circuit. In an automatic bath water filling device that fills hot water up to a set water level using the value as a reference water level, when the above output change corresponding to submergence of the bath adapter is detected, the water level sensor output value with respect to time can be converted into bath water level conversion or bath water level speed conversion. ,0~20cm
The present invention relates to an automatic bath water filling device characterized in that only a change in /win is detected as a target for water level detection.

(e) Examples Hereinafter, the present invention will be specifically explained based on examples shown in the attached drawings.

First, the configuration of the automatic bath water filling device A according to the present invention will be specifically explained with reference to FIG. Like a hot water filling device, it has the same form as a hot water supply system that can fill a desired amount of hot water into a bath, but as will be described later, there is a connection between the pump discharge side and the bath return piping. The difference is that a bypass pipe is provided between the two to fill the bath return pipe with hot water.

That is, in FIG. 1, a gas turbine 10 receives hot water through a hot water supply branch pipe 9 branched from a hot water supply pipe 8 connected to a hot water heat exchanger 7, and a pump 13 is connected to the pump 13 via a three-way switching valve 12 provided in a lower pipe 11 thereof. It is connected in communication with the suction port 14 . In addition, in the figure, 6 is a water supply pipe for supplying water to the heat exchanger 7 for hot water supply.

Further, the discharge port 15 of the pump 13 is connected to a reheating heat exchanger 17 via a water flow switch 16, and on the other hand,
The reheating heat exchanger 17 is connected to a bath adapter 20 provided in the bath 19 via a bath pipe 18.

On the other hand, one end of a bath return pipe 21 is connected to the bath adapter 20, and the other end of the bath return pipe 21 is connected to the three-way switching valve 12.

Further, a water level sensor 22 is attached to the middle of the bath return pipe 21.

In the present embodiment, in the above configuration, the discharge port 15 of the pump 13 and the middle of the bath return pipe 21 are connected by a bypass pipe 23, and a cutoff valve 24 is further attached to the bypass pipe 23.

With this configuration, by opening the shutoff valve 24, hot water can be directly supplied from the pump 13 to the bath return pipe 21, and air remaining in the pipe 21 can be removed.

Next, with reference to FIGS. 2 and 3, a method for automatically filling a bath with hot water using the automatic bath water filling device A described above will be described.

In the flowchart shown in FIG.
0), (101), and (102) are provided to detect the presence or absence of residual water in the bath 19 up to the bath adapter 20.

That is, as shown in step (100), first, the shutoff valve 24 of the bypass pipe 23 is opened and
0 to 1005ec), hot water supply branch pipe 9 → Jistern 10
→ Lower piping 11 → Pump 14 → Hot water filling flow path consisting of bath pipe 18, and hot water supply branch pipe 9 → Distance unit 10 →
Hot water is supplied to the bath 19 through an air vent flow path consisting of the lower pipe 11 → pump 14 → bypass pipe 23, and the air in the bath return pipe 21 is vented.

Thereafter, as shown in step (101), the shutoff valve 24
At the same time, the three-way switching valve 12 is operated, and the pump 14 → bath going pipe 18 → bath 19 → bath return pipe 21
→A reheating circulation flow path consisting of the pump 14 is formed to circulate hot water.

In this hot water circulation operation, if the water flow switch 16 connected to the discharge port 15 of the pump 13 is turned on continuously for a certain period of time (for example, about 205 ec), it is determined that ice remains (102Y).

If it is determined that ice remains (102Y), it is determined whether the water level in the bath 19 is higher than the set water level (103).
If the water level is higher than the set water level (103Y), reheating/warming operation is performed through the reheating circulation circuit (104).

Then, in step (102), if it is determined that there is no remaining water (102N), step (105)
As shown in the figure, open the shutoff valve 24 of the bypass pipe 23,
Hot water is supplied to the bath 19 through the bath-going pipe 18 and the bypass pipe 23 for a predetermined period of time (for example, 60 to 1005 ec), and the air in the bath-returning pipe 21 is vented.

Thereafter, as shown in step (106), the shutoff valve 24
At the same time, connect the bath 1 through the bath pipe 18.
Hot water will be supplied within 9 days.

As the hot water was being supplied, the output value (pressure difference) of the water level sensor 22 installed in the bath return pipe 21 became Δv0 in the range of 0 to 20 cm/min, as shown in FIGS. 1 and 3. If (107Y), operate the three-way switching valve 12 to form a reheating circulation flow path and circulate the hot water (10
8).

However, as shown in FIG. 4, the output value (pressure difference) of the water level sensor 22 has a steep gradient Δv2 of 0 to 20 cn+/min or more in terms of bath water level, as in the case of high-altitude hot water supply.
(107Y), depending on the output value of the control device such as a microcomputer, the three-way switching valve 1
2 is not activated, and then, as shown in Fig. 4, the output value (pressure difference) of the water level sensor 22 becomes Δv0 in the range of 0 to 20 cm/min, as shown in Figs. 1 and 3. At that point (107Y), the three-way switching valve 12 is operated to form a reheating circulation flow path and circulate the hot water (108).
.

That is, even in the case of high-altitude hot water supply, after the bath return piping 21 is completely devoid of air and filled with hot water, the three-way switching valve 12 is operated to form a reheating circulation flow path. Circulate hot water (10B).

In this hot water circulation operation, if the water flow switch 16 connected to the discharge port 15 of the pump 13 is turned on continuously for a certain period of time (for example, about 405 ec), it is assumed that the bath return pipe 21 is filled with hot water. You will have to judge.

Note that these are determined based on the circulation flow rate, the pipe diameters of the bath-going pipe 18 and the bath-return pipe 21, and the certainty of water filling.

Further, after the water flow switch 16 has turned on, it is assumed that the reference water level has been detected (109), and the three-way switching valve 12
is activated, the flow path changes from the reheating circulation flow path to the hot water filling flow path, and hot water is filled throughout the day in the bath-going pipe (110).

When the output value (pressure difference) of the water level sensor 22 installed in the bath return pipe 2I becomes Δ■ as shown in FIGS.
), it is determined that hot water has been filled in the bath 19 to the set water level, and the hot water filling operation is stopped.

Thereafter, reheating and heat retention operation is performed through the reheating circulation circuit (104).

In addition, in the sequence of the automatic bath water filling method described above, the opening time of the shutoff valve 24 of the bypass pipe 23 is approximately 30 seconds.
It is said that

Moreover, the pressure loss of the above-mentioned shutoff valve 24 is made to be the same level as that on the bathtub piping 18 side where the reheating heat exchanger 17 is attached, and when the shutoff valve 24 is open, the bathtub piping 18 and the bath return piping 21 are I'm trying to make it flow. (This is because the water filling time of the bath return pipe 21 is set by time).

In this way, in this embodiment, the output of the water level sensor 22 is
By detecting only when there is a change in bath water level speed conversion from 0 to 201/win, it is possible to accurately and reliably detect the reference water level due to the circulation of the bath return piping 21, and then continue filling with hot water based on the same reference water level. and can stop at a set water level. Therefore, high hot water filling level accuracy can be ensured.

As a result of an experiment conducted by the present applicant with the bath automatic hot water filling device A having the configuration shown in FIG. The output change of the water level sensor 22 for detecting the reference water level in the bath adapter 20 is 75 to 51 in terms of bath water level speed.
It was found that the change was up to 6 cm/lll1n.

On the other hand, the water level rise speed in a practical bath varies depending on the size of the bath and the flow rate of hot water supply, but is 0.3 to 1.
It is 0cm/win.

For this reason, the output change of the water level sensor 22 is configured to detect only a change of 0 to 20 f/win in terms of bath water level speed.

(F) Effects As explained above, in the present invention, by detecting the output of the water level sensor only when there is a change of 0 to 201/+++ in in terms of the bath water level speed, the bath return piping i
The reference water level can be detected accurately and reliably by the ring, and based on the reference water level, subsequent hot water filling can be continued and stopped at the set water level. Therefore, high hot water filling level accuracy can be ensured.

[Brief explanation of drawings]

Fig. 1 is a conceptual configuration explanatory diagram of the automatic bath water filling device according to the present invention, Fig. 2 is a flowchart showing the sequence of the automatic bath water filling method according to the present invention, and Fig. 3 is the normal operation of the water level sensor. A graph showing the state, FIG. 4 is a graph showing the operating state of the water level sensor at the time of abnormality, and FIG. 5 is a conceptual diagram illustrating the configuration of hot water supply at high places. In the diagram, A: Bath automatic hot water filling device 10: Distern 13: Pump water flow switch Heat exchanger for reheating Bath pipe going to the bath Bath bus adapter Bath return pipe Water level sensor Bypass pipe shutoff valve

Claims (1)

[Claims] 1. A bath reheating circuit equipped with a pump (13) and a bath dropping circuit connected to the reheating circuit, and a bath return piping (21) of the bath reheating circuit. Water level sensor (22
), and when the output change of the water level sensor (22) reaches a value equivalent to submerging the bus adapter (20),
The bath adapter (20) is used in an automatic bath hot water filling device that fills the bath return pipe (22) with hot water by circulating the pump in the bath reheating circuit, and fills the hot water up to the set water level using the value at that time as the reference water level. An automatic hot water filling device for a bath, characterized in that when detecting the output change corresponding to submergence of water, only changes in the water level sensor output value with respect to time of 0 to 20 cm/min in terms of bath water level speed are subject to water level detection. .