JPH0723799B2 - Gas water heater - Google Patents

Description

TECHNICAL FIELD The present invention relates to a gas water heater.

2. Description of the Related Art FIG. 2 shows an example of a conventional gas water heater capable of pouring hot water into a bathtub, where 1 is a heat exchange section for burning gas to turn water into hot water,
Reference numeral 2 is a bathtub, 3 is a pouring valve for pouring water into the bathtub, 4 is a water level sensor for detecting the water level of the bathtub 2, 5 is control of the heat exchange section 1, and pouring valve 3 is controlled by the water level. Is a control unit for.

When pouring into the bathtub 2, if the water level is set by the control unit 5 and pouring is started, the pouring valve 3 is opened and pouring into the bathtub 2. When pouring is started, the water level sensor 4 sends a water level detection signal to the control unit 5, and when the set water level is reached, the control unit 5 judges and the pouring valve 3
Is closed, pouring is completed, and pouring to a predetermined water level is possible.

Problems to be Solved by the Invention However, in the above configuration, the pouring water level is always constant, and even if a person enters the bathtub during pouring, pouring is completed at the same water level as when there is no person Therefore, it is not possible to pour up to the water level actually requested. That is, there is a drawback that a constant bath water amount cannot be obtained.

The present invention solves such a conventional problem, and provides a gas water heater that can obtain the amount of filling water in the bathtub according to the set water level even if a person enters and leaves the bathtub while filling the bathtub with water. The purpose is to do.

Means for Solving the Problems The gas water heater of the present invention is a pouring valve for pouring hot water into a bathtub, a water level sensor for detecting the water level of the bathtub, and a water level rising speed from the water level detection signal of the water level sensor. While controlling the pouring valve to pouring into the bathtub by the bath level determination unit to detect, and the water level sensor detects the set water level,
When the water level rise speed detection signal from the bathtub state determination unit is determined to be an abnormal value, a control unit for correcting the set water level by the abnormal water level rise value and controlling the pouring, and the amount of water filling the bathtub. And a bathtub water level setting device for setting and inputting as the set water level.

The action control unit receives the water level rising speed signal as a ratio of the rising value of the bath water level at a predetermined time interval from the bath state determination unit, and an abnormally large value occurs when a person takes a bath while filling the bath. The water level rise speed value is set in advance as an abnormality judgment value, and when it exceeds this value, it is judged as an abnormal state of the bathtub during pouring, and the water level equivalent to the amount of water due to the empty water level rise caused by this person's bathing Only add the correction to the set water level.

Therefore, even when a person enters the bathtub during pouring, when the person leaves the bathtub, it is possible to obtain the bath water amount of the set water level.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, 6 is a heat exchange section for burning gas to turn water into hot water, 7 is a bathtub, 8 is a pouring valve for pouring hot water into the bathtub 7, and 9 is a water level sensor for detecting the water level of the bathtub 7. , 10 are control parts for controlling the heat exchange part 6 and for controlling the pouring valve 8 according to the water level, and 11 is a bath state determination part for detecting the water level rising speed of the water level sensor 9.

The set water level in the bathtub 7 can be set and input by the control unit 10. The bathtub state determination unit 11 calculates the water level difference from the water level sensor 9 before and after this at a predetermined time interval (currently 1 second) as a water level rising rate of a minute speed.

The flow rate of hot water supplied to the bathtub 7 from the heat exchanging unit 6 is limited by the change in the water temperature and the heat exchange capacity, and the size of the bathtub 7 to be applied is also limited, so that the water level rising speed can be limited to a certain range.

However, the change in bathtub water level that occurs when a person takes a bath in or takes a bath out of the bathtub 7 is a value that greatly exceeds the maximum value in the above range, even if the operation takes a slow time.

Therefore, when a person bathes in and out of the bathtub 7 while bathing, if a water level rising speed value higher than the maximum value is set as a reference value for abnormality determination, a bathing person in the bathtub It is possible to determine the rise and fall of the water level in the sky, that is, the increase or decrease of the water level without the increase or decrease of the actual water volume.

According to this configuration, the rising speed of the water level is determined by the bathtub state determination unit 11 from the start of pouring, and a constant level "the above range" is always maintained.
If the water level rises, it is determined that the state of the bathtub has not changed,
When the bath water level reaches the water level set by the control unit 10, the pouring valve 8 is closed and pouring is completed.

When the control unit 10 detects an abnormality in the water level rising speed during pouring, for example, when the reference value for the abnormality determination is 5 cm / min, 10
If cm / min is detected, it is determined that a person has taken a bath while the pouring operation is still being performed.

The water level corresponding to the deviation from the water level rising speed value before the abnormal value is detected is only an increase in the empty water level that does not involve actual filling, so the actual water level reaches this corrected water level in addition to the set water level. When it does, the pouring valve 8 is closed.

In this way, even if a person takes a bath during pouring, the amount of water corresponding to the water level set before bathing can be poured, and the set water level can be guaranteed even if a person exits the bathtub 7 after the pouring is completed.

Also, when this bather still takes a bath while filling the bath, the bath water level is suddenly decreased, and the control unit 10 has a negative water level rising speed value, and its absolute value exceeds the reference value for the abnormality determination. To detect.

If this abnormality is left as it is, the pouring water level into the bathtub 7 will exceed the set water level by human bathing correction by as much as 10 cm.

Therefore, the control unit 10 adds correction correction for the set water level again to the correction value at the time of bathing. At this time, only one of the two bathers may take a bath, so the water level is not returned to the default water level.

A flowchart of the above operation is shown in FIG.

It should be noted that the check of the negative reference value in parallel with the inspection of the recorrected water level, the second check of the water level rising speed, etc. are omitted for ease of explanation of the flow.

Thus, according to this embodiment, it is possible to obtain a predetermined amount of water in the bath even when a person enters or leaves the bath during pouring.

EFFECTS OF THE INVENTION As described above, according to the present invention, the state of the bathtub changes when a person takes a bath or takes a bath during the pouring operation in which the water level is set instead of setting the amount of filling the bathtub. Even so, the bathtub state determination unit detects the rate of rise and fall of the water level from the water level detection signal of the water level sensor, so the control unit determines that it is an abnormal state relative to the state where there is no person bathing and the set water level is It is possible to correct the bathing and bathing to obtain the amount of water filling at the initial set water level.

[Brief description of drawings]

FIG. 1 is a block diagram of an embodiment of the gas water heater of the present invention, and FIG.
FIG. 3 is a configuration diagram of a conventional gas water heater, and FIG. 3 is a flow chart diagram showing a filling operation of the same embodiment. 6 ... Heat exchanger, 8 ... Pouring valve, 9 ... Water level sensor, 10 ... Control part, 11 ... Bath condition judging part.

Claims (1)

[Claims] 1. A pouring valve for pouring hot water into a bathtub, a water level sensor for detecting the water level of the bathtub, a bathtub state determination unit for detecting a water level rising speed from a water level detection signal of the water level sensor, and the water level sensor. While controlling the pouring valve so as to pour into the bathtub by the time the set water level is detected, when the water level rise speed detection signal from the bath state determination unit is determined to be an abnormal value, this abnormal water level rise value A gas water heater including a control unit for controlling the pouring water by correcting the set water level only, and a bath water level setting device for setting and inputting the amount of water filling the bath as the set water level.