JPH081331B2 - Bathtub water level detection control device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hot water supply control device that considers the temperature characteristics of a water level sensor that detects the water level of a bathtub.

2. Description of the Related Art Conventionally, as shown in FIG. 7, a control device of this type has a bathtub 1, a hot water supply port 2 for supplying hot water to the bathtub 1, a circulation pipe 3 for supplying hot water to the hot water supply port 2, and a circulation pipe 3. Water level sensor 4 for detecting the water head pressure on the water surface of the bathtub 1 and the bath temperature sensor 5 for detecting the temperature of the hot water in the circulation pipe 3, that is, the bath water temperature, and the circulation pump 6 for sending hot water to the bath 1.
In addition, the hot water supply heat exchanger 7 for supplying hot water to the bathtub 1, the hot water supply burner 8, the hot water supply valve 9, and the hot water supply means 11 having the hopper 10 for temporarily storing the hot water supply the hot water supply piping 12 and the circulation of the bath. A bath heat exchanger 13, a bath reheating means 15 having a bath burner 14 and the like, and a switching valve 17 for switching between the water level sensor 4 and the circulation piping 16 by the bath temperature sensor 5, and the water level detection of the water level sensor 4 and the bath temperature sensor 5. Value and hot water temperature detection value are input, and further, the water level setting value and bath temperature setting value of the bath water level setting device 19 and the bath temperature setting device 20 of the remote controller 18 are input until the water level setting value and bath temperature setting value are reached. The hot water supply means 11 and the bath reheating means 15 are selectively operated by the switching valve 17, and the hot water replenishment control means 21 is provided for circulating hot water in the bathtub by the circulation pipe 6 to supply and boil hot water. In addition, the hot water heated by the hot water supply burner 8 and the hot water supply heat exchanger 7 of the hot water supply means 11 is distributed through the hot water supply valve 9 to the hopper 10 side and the currant side such as the kitchen and washbasin for distribution of hot water. It is connected.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention However, in the configuration as described above, the hot water supply reheating control means 21 has the water level set value and the bath temperature set value input from the bath water level setting device 19 and the bath temperature setting device 20 of the remote controller 18. On the other hand, the water level detection value and the hot water temperature detection value from the water level sensor 4 and the bath temperature sensor 5 are respectively compared, and if the water level detection value <water level setting value, hot water is supplied by the hot water supply means 11 and the hot water temperature detection value < If it is the set value of the hot water temperature, the hot water is heated by the hot water heating means 15. Therefore, when the water level sensor 4 that detects the water head pressure of the bathtub 1 has temperature characteristics, the difference between the ambient temperature of the water level sensor 4 at the time of water level detection at the initial boiling stage and the ambient temperature of the water level sensor at the completion of boiling is The larger the value, the more uneven the boiling water level. In particular, when there was a residual hot water on the previous day, the residual hot water was almost at the water temperature, so that there was a problem of being greatly affected by the above.

The present invention is to solve such conventional problems, and to avoid the influence of the temperature characteristics of the water level sensor, it is an object of the present invention to provide a bath water level detection control device that always consistently matches the boiling water level with the bath water level set value. It is what

Means for Solving the Problems In order to solve the above problems, the bathtub water level detection control device of the present invention is a water level sensor that detects a water head pressure of the bathtub water surface,
A bath temperature sensor for detecting bath water temperature, a hot water supply means for supplying hot water to the bathtub, a bath heating means for heating hot water in the bathtub, a bath water level setting device for setting the water level and the hot water temperature of the bath, and During the automatic bath heating operation by the bath temperature setting device and the hot water supply means or the bath reheating means,
Only for a predetermined time, the bath heating method is used to perform the additional heating operation,
From the temperature characteristic calculation means for calculating the temperature characteristic value of the water level sensor from the water level detection value change of the water level sensor and the hot water detection value change of the bath temperature sensor before and after the predetermined time, and from the temperature characteristic calculation means. Based on the temperature characteristic value, the water level detection value for the water level set value is corrected, and the hot water supply means and the bath reheating are performed until the corrected water level detection value is reached and the hot water temperature detection value reaches the hot water temperature set value. And a hot-water supply / hot-burning correction control means for supplying hot water and heating the hot water by means.

Action With the above configuration, the hot water supply operation is temporarily stopped during hot water supply to the bathtub, and reheating is performed, and the water level fluctuation rate per unit temperature rise of the water level sensor is measured. By calculating as a characteristic value, the deviation of the boiling water level due to the temperature characteristics of the water level sensor, especially the effect of variations in the bath water temperature at the time of initial water level detection when there is residual hot water on the previous day, is eliminated, and the bath setting water level is always maintained. It is possible to stabilize the boiling water level for, and to minimize the deviation between the bath setting water level and the boiling water level.

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

FIG. 1 shows a control block diagram of a bathtub water level detection control device according to an embodiment of the present invention, and the same members as those in FIG. 7 of the conventional example are designated by the same reference numerals. In FIG. 1, the temperature characteristic calculation means 23 detects a water level sensor 4 which detects a water head pressure corresponding to the water level of the bathtub 1 in the path of the circulation pipe 3 and the hot water temperature of the bathtub 1 from the circulating hot water of the circulation pipe 3. The detection signal from the bath temperature sensor 5 is input, the measurement start signal is sent to the timer means 22 that measures a predetermined time, and the measurement end signal is input, and the water level change from the water level displacement to the temperature rise within the predetermined time is changed. The temperature change rate is calculated and output as a temperature characteristic value signal of the water level sensor 4. The hot water reheating correction control means 24 receives the temperature characteristic value signal from the temperature characteristic calculating means 23, corrects the water level detection value with respect to the water level setting value of the water level setting device 19 provided in the remote controller 18, and detects the corrected water level. The hot water is supplied by the hot water supply means 11 and the hot water is heated by the bath heating means 15 until the hot water temperature detection value reaches the hot water temperature set value.

FIG. 2 shows an enlarged cross-sectional view of the connection portions of the water level sensor 4 and the bath temperature sensor 5 in the circulation pipe 3. The water level sensor 4 is configured to receive the water head pressure P between the water surface of the bathtub 1 and the hot water supply port 2 by the diaphragm 25 and transmit it to the semiconductor pressure sensor 27 via the silicone oil 26 as a filling material. The semiconductor pressure sensor 27 is connected so as to convert the pressure into an electric signal by an electric signal converting means 28 for converting the pressure into an electric signal and send the electric signal to the temperature characteristic calculating means 23 and the hot water supply heating correction control means 24. The bath temperature sensor 5 is connected so as to convert the hot water temperature into an electric signal according to the temperature-resistance value change characteristic of a thermistor or the like, and send it to the temperature characteristic calculation means 23 and the hot water supply reheating correction control means 24 like the water level sensor 4. There is.

In the above configuration, an automatic bath heating operation operation will be described with reference to FIGS. 3 to 6. FIG. 3 shows the water level sensor 4 with respect to the elapsed time t from the start of bath heating (t = to).
The change of the water level detection value X of is shown. Similarly, FIG. 4 shows a change in the hot water temperature detection value T of the bath temperature sensor 5 with respect to the elapsed time t from the start of boiling the bath (t = to). FIG. 5 shows changes in the state of the hot water supply operation of the hot water supply means 11 and the changes of the heating operation of the bath reheating means 15 with respect to the elapsed time T from the start of bath heating (t = to). FIG. 6 is a view for explaining the water level change state of the bathtub 1 corresponding to FIG.

3 to 6, the bath boiling start (t = t
o) The water level and water temperature are x ₁ and T ₁ . First, the hot water supply heating correction control means 24 performs hot water supply to the bathtub 1 by the hot water supply means 11 for t = t ₁ . Next, the hot water supply heating correction control means 24 stops the operation of the hot water supply means 11, and the circulation pump 6 causes the bathtub 1 to operate.
Circulate the hot and cold water inside. After that, the water level sensor 4 and the bath temperature sensor 5 detect the water level and the hot water temperature, respectively, with the water level detection value x ₂ and the hot water temperature detection value T ₂ . Next, a temperature characteristic calculation start signal is sent to the temperature characteristic calculation means 23 and an additional heating start signal is sent to the bath heating means 15. Upon receiving the temperature characteristic calculation start signal, the temperature characteristic calculation means 23 sends a measurement start signal to the timer means 22, and after the timer counting is completed (t =
After t ₂ ) Receive the measurement end signal. The temperature characteristic calculation means 23 to which the measurement end signal is input receives the water level detection value x ₂ from the water level sensor 4 and the hot water temperature detection value T ₃ from the bath temperature sensor 5 at this time, but the structure of the water level sensor 4 By combining the temperature characteristics of the diaphragm 25, the oil silicon 26, the semiconductor pressure sensor 27 and the electric signal converting means 28, x ₂ ~
Δx _{B to} x ₂ + Δx _A is input as the water level detection value. Therefore, the temperature characteristic calculating means 23 has α ₁ = −Δx _B / (T ₃ −T ₂ ) ˜
α ₂ = Δx _A / (T ₃ −T ₂ ) is calculated as the temperature characteristic value of the water level sensor 4, and is sent to the hot water supply additional heating correction control means 24. Next, the hot water reheating correction means 24 receives the temperature characteristic values α _{1 to} α ₂ of the water level sensor 4, and receives the water level set value x _S sent from the bath water level setting device 19 and the bath temperature setting device 20 of the remote controller 18. and based on the hot water temperature setting value T _S, the increasing water content of up to set the current level x ₂ level (x _S -x _2), the temperature rise of up to a set water temperature for the current hot water temperature T ₃ (T _S -T ₃ ), which is the sum of the temperature changes α ₁ (T _S −T ₃ ) to α ₂ (T _S −T ₃ ) of the water level detection value of the water level sensor 4, that is, x _S (B) = x _{S + α 1 (T S -T 3} ) ~x S (A) = x S +
α ₂ (Ts−T ₃ ) is used as a water level detection value corrected with respect to the set water level, and hot water supply and reheating are performed by the hot water supply means 11 and the bath heating means 15 until the correction value is reached and the hot water temperature set value is reached. = Go to the period of t ₃ to complete the bath heating operation.

Therefore, by obtaining the temperature characteristic value of the water level detection value of the water level sensor 4 at the predetermined time t = t ₂ and correcting the water level detection value with respect to the set water level, the deviation of the boiling water level due to the temperature characteristic of the water level sensor can be prevented. In particular, if there is a residual hot water on the previous day, the residual hot water temperature has almost reached the water temperature, so the hot water temperature T ₂ at the initial water level detection, that is, when detecting x _{2 and} the hot water temperature when the set water level x _{S is} reached. the temperature difference between T _S (T _S -T ₂₎ or greater has a large effect. Further, once the temperature characteristic value of the water level detection value of the water level sensor 4 at the predetermined time t = t ₂ is measured, the temperature characteristic value of the water level sensor 4 can be obtained as If it is memorized and updated every certain number of boiling times or every certain period, the total boiling time can be shortened, and the secular change in the temperature characteristic of the water level sensor 4 can be grasped and corrected, so that it can be always corrected. The water level error at the time of boiling can be minimized.

EFFECTS OF THE INVENTION As described above, according to the bathtub water level detection control device of the present invention, a water level sensor that detects the water head pressure on the bathtub water surface, a bath temperature sensor that detects the bathtub hot water temperature, and a hot water supply means that supplies hot water to the bathtub. And a bath reheating means for reheating the hot water of the bathtub, a bath water level setting device and a bath temperature setting device for setting the water level and the hot water temperature of the bath, and an automatic bath by the hot water supplying means or the bath reheating means. During the boiling operation, the reheating operation of the bath reheating means alone is performed for a predetermined time, and the water level is detected from the change in the detected water level of the water level sensor and the change in the detected water temperature of the bath temperature sensor before and after the predetermined time. Based on the temperature characteristic calculation means for calculating the temperature characteristic value of the sensor and the temperature characteristic value from the temperature characteristic calculation means, the water level detection value for the water level set value is corrected, and the corrected water level detection value is reached. Hot water By providing hot water reheating correction control means for supplying and reheating hot water by the hot water supplying means and the bath reheating means until the temperature set value is reached, it becomes possible to detect the temperature characteristic value of the water level sensor having the temperature characteristic. By correcting the water level detection value for the set water level, the deviation of the boiling water level from the bath set water level is always minimized regardless of the temperature of the remaining hot water in the bathtub, and the temperature characteristic value due to the secular change (life) of the water level sensor By constantly compensating for changes, stable boiling water level accuracy can be secured over the long term.

[Brief description of drawings]

FIG. 1 is a control block diagram of a bathtub water level detection control device according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a connection part in a bathtub circulation pipe of a water level sensor and bath temperature sensor of the bathtub water level detection control device. Fig. 3 is a transient characteristic diagram of the water level detected value when the bath is heated, Fig. 4 is a transient characteristic diagram of the bath temperature sensor detected value when the bath is heated, and Fig. 5 is a hot water supply and additional heating mode when the bath is heated. Fig. 6 is a state change diagram of Fig. 6, Fig. 6 is an explanatory diagram of changes in bathtub water level when the bath is heated, and Fig. 7 is a control block diagram of a conventional bathtub water level detection control device. DESCRIPTION OF SYMBOLS 1 ... Bathtub, 3 ... Circulation pipe, 4 ... Water level sensor, 5 ... Bath temperature sensor, 6 ... Circulation pump, 11 ... Hot water supply means, 15 ... Bath heating means, 17 ... Switching valve, 18 ... Remote control, 19 ... Bath water level Setting device, 20 ... Bath temperature setting device, 22 ... Timer means, 23 ... Temperature characteristic calculation means, 24 ... Hot water supply additional heating correction control means.

Claims (1)

[Claims] 1. A circulation pipe for supplying hot water to a bathtub and circulating the hot water, a water level sensor for detecting a head pressure on the water surface of the bathtub, a bath temperature sensor for detecting the bath water temperature, and a circulation pump for circulating hot water to the bathtub. A bath reheating means for heating hot water in the bathtub; a hot water supply means for supplying hot water to the bathtub; a bath water level setting device and a bath temperature setting device for setting the water level and hot water temperature of the bath; and the hot water supplying means. Alternatively, during the automatic bath boiling operation by the bath heating means, the heating operation of the bath heating means alone is performed for a predetermined time, and the change in the water level detection value of the water level sensor and the hot water of the bath temperature sensor before and after the predetermined time. Temperature characteristic calculation means for calculating the temperature characteristic value of the water level sensor from the change in the temperature detection value, and the water level detection value for the water level set value based on the temperature characteristic value from the temperature characteristic calculation means Corrected, hot water reheating correction control means for supplying hot water by the hot water supply means and the bath reheating means and reheating until the hot water temperature detection value after correction and the hot water temperature detection value reach the hot water temperature set value. Equipped with bathtub water level detection control device.