JPH0243977B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a reheating bath device that detects the temperature of water in a bathtub and automatically controls combustion in the bathtub.

Conventional configurations and their problems Conventionally, as bath equipment, as shown in Fig. 1, there are a natural circulation bath pot 1 and a bathtub 8 that have a reheating function.
There were many combinations of these, each of which was treated as having an independent function. And circulation port 6,
In the natural circulation type bathtub 1 according to No. 7, since the heat exchange efficiency is efficient by utilizing the temperature distribution in the vertical direction inside the bathtub 8, the only way to know the boiling temperature of the water in the bathtub is to use the time-based method. Don't boil too much,
There were also some deficiencies in usage, such as the water being lukewarm. Further, even if a timer is used, the water temperature varies depending on the season, so the timer time must be changed depending on the season, making automatic setting difficult.

On the other hand, as a method to automatically detect boiling,
A method of detecting the water temperature in the bathtub by uniformizing the temperature of the water in the bathtub using forced circulation using a pump attached to the bathtub may be considered, but the thermal efficiency decreases if the water temperature is made uniform during boiling, and the pump The cost of the bathtub increases due to the use of water, and the electricity bill during use also increases.

Purpose of the invention The present invention solves such conventional problems,
The purpose is to detect the depth and temperature of water in the bathtub and recognize when the water is boiling.

Structure of the Invention In order to achieve this object, the present invention provides a bathtub having a fuel valve that opens and closes a fuel passage by an electric signal, a control circuit unit that controls the fuel valve, and a bathtub and a temperature and pressure inside the bathtub. The control circuit section includes a temperature sensor and a pressure sensor, and the control circuit section includes a temperature setting section;
The temperature detection circuit comprises a correction temperature setting section, a comparison circuit section that compares the output of the temperature detector and the output of the correction temperature setting section, and a drive circuit section that drives the fuel valve with the output of the comparison circuit section. The pressure detector is set at a position y ₁ a certain distance below the water surface of the bathtub, and the pressure detector is set at a position to detect the water depth y of the bathtub,
The correction temperature setting section corrects the output of the temperature setting section based on the ratio y ₁ /y of the temperature detector position y ₁ to the water depth y.

With this configuration, the temperature of the temperature sensor installed a certain distance below the water surface y ₁ is detected, and the ratio y of the water depth y determined by the output of the pressure sensor installed in the bathtub to the temperature sensor position y ₁ is detected. ₁ /y has the effect of stopping combustion at the desired boiling temperature, regardless of the amount of water in the bathtub.

DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 2 and 3. In FIG. 2, reference numeral 1 denotes a bath pot, and inside the pot there are a combustion section 2, a heat exchange section 3, a control circuit section 4 for controlling the combustion state of the combustion section 2, and a fuel valve 5. Two upper and lower circulation ports 6 and 7 from the bathtub 1 are connected to a bathtub 8. Inside the bathtub, there is a pressure detector 9 at a position that can detect the water depth at the bottom, and a float 10 above the water surface, and a temperature detector ₁₁ is connected at a position a certain distance y1 below the float 10, The pressure detector 9 and temperature detector 11 are connected to the control circuit section 4.

The control circuit section 4 includes a temperature sensor 1 as shown in FIG.
The output of the pressure detector 9 is connected to the comparison circuit section 13 via the temperature amplification circuit section 12, and the output of the pressure detector 9 is connected to the correction temperature setting section 15 for correcting the temperature setting section 14 via the pressure amplification circuit section 12. There is. The comparison circuit section 13 compares the amplified output of the temperature detector 11 with the correction temperature setting section 15, and is connected to a drive circuit section 16 which is driven by this signal.
The output of 6 is configured to send a signal to the fuel valve 5.

The operation of the above configuration will be explained with reference to FIGS. 2 to 6. In FIG. 2, when water is filled in the bathtub, the float 10 floats on the water surface, and the temperature sensor 11
is always the float 10 no matter what the water depth.
It is installed at a fixed distance y ₁ below. That is, it is located at a position y ₁ below the water surface. Also, the pressure detector 9 determines the water depth y. When combustion starts now, hot water comes out from the circulation port 6 in Figure 2, and a hot mass spreads near the water surface of the bathtub due to the draft. The hot water gradually descends from the surface of the water over time. here under the water
As shown in Figure 4, the temperature of the temperature detector 11 at _y1 rises only gradually at first, but as the high-temperature layer spreads from above, a sudden rise in temperature is seen, and then the temperature gradually increases. Rise. Now, set an appropriate temperature detector position y ₁ so that boiling is detected at boiling temperature T ₀ . (In this case, point A is selected after a rapid temperature rise is observed. Fig. 4) Then, boiling is detected at time t ₀ .

However, although normally the temperature T ₀ at this time is always located at a certain distance y ₁ below the water surface,
It's only one point in the entire bathtub, and depending on the amount of water, it may be overboiled or it may be lukewarm. Therefore, in the present invention, the water depth y obtained from the pressure detector 9 is calculated, and the output of the temperature setting section 14 is
A new temperature setting corrected by the value of y ₁ /y is provided in the corrected temperature setting section 15.

More specifically, as shown in FIG. 5, this correction curve is expressed in a coordinate system in which the horizontal axis is y ₁ /y and the vertical axis is the calibration coefficient f. Normally, the water depth at which the detected value of the boiling temperature is appropriate from the perspective of the entire bathtub is set as f = 1 (Figure 4 corresponds to this).The value of f is set so that it changes depending on the water depth. It has been done. Therefore, the corrected temperature setting section 15 sets a new temperature by multiplying the set temperature T ₀ in the temperature setting section 14 by the correction curve f. By comparing the output of the corrected temperature setting section 15 with the output of the temperature amplification circuit section 12 amplified from the temperature detector 11, combustion can be stopped and true boiling can be detected.

Here, the relationship between temperature T ₀ and time t ₀ is shown in FIG. 4 for the standard type, but the case where the amount of hot water is large will be specifically explained using FIG. 6.

FIG. 6 shows the relationship between temperature T ₁ and time t ₁ when the amount of hot water is large, and the relationship between temperature T' ₁ and time t' ₁ after correction. The dotted line is the standard type. Standard type boiling time
t ₀ is the intersection point A with the boiling temperature T ₀ , but as the amount of water increases, the boiling time naturally increases and the time t ₁ and the boiling set temperature
Boiling is detected at the intersection of T ₁ (=T ₀ ), but compared to the standard type, even if the temperature below the water surface y ₁ is the same, there is more water in the low temperature area because the water is deeper. . Therefore, by measuring the water depth y with a pressure detector, the value T' ₁ (= f x T ₁ ) obtained by multiplying the temperature T ₁ by the correction line of y ₁ /y=f is determined as the new set temperature, and this The time when the temperature reaches (intersection C) t′ ₁
is detected as the boiling time, and the drive circuit section 16 closes the fuel valve 5 to stop combustion.

In addition, although the setting method of the temperature setting part 14 has not been described in the explanation so far, there are several types of switching depending on the shape of the bathtub (deep and close to a cube shape, shallow and close to a rectangular parallelepiped shape). It is necessary to determine the set temperature by experiment.
Also, by inputting the signal from the temperature amplification circuit section 16 amplified from the temperature detector 15 to the temperature setting section 19 and storing the initial water temperature, the boiling temperature is automatically set since the amount of water in the bathtub is known. becomes possible. Therefore, it is possible to automatically adjust to seasonal changes in water temperature, or to precisely manage hot water by predicting and displaying the boiling time. (Fig. 7) The above operation can also be performed by inputting various boiling temperature conditions using a microcomputer.

Effects of the Invention As described above, according to the bath device of the present invention, the following effects can be obtained.

(1) Since the temperature and water depth y at a certain distance y ₁ below the water surface are detected, boiling can be automatically detected even in natural circulation type bath pots.

(2) Furthermore, since the temperature is corrected based on the ratio of distance y ₁ to water depth y, y ₁ /y, the amount of water (water depth y) can be detected and the boiling time can be adjusted, providing comfortable hot water at all times. .

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a conventional bath equipment, Fig. 2 is a block diagram showing an embodiment of the present invention, Fig. 3 is a block diagram showing an embodiment of the control circuit section, and Fig. 4 is a block diagram of the same standard. FIG. 5 is a temperature characteristic diagram, FIG. 5 is a correction curve diagram, FIG. 6 is a temperature characteristic diagram, and FIG. 7 is a configuration diagram showing another embodiment of the control circuit section. 1... Bath pot, 4... Control circuit section, 5... Fuel valve, 8... Bathtub, 9... Pressure detector, 11... Temperature detector, 13... Comparison circuit section, 14... Temperature setting section, 15... correction temperature setting section, 16... drive circuit section.

Claims (1)

[Scope of Claims] 1. A bathtub having a fuel valve that opens and closes a fuel passage based on an electric signal, a control circuit unit that controls the fuel valve, a bathtub, and a temperature detector that detects the temperature and pressure inside the bathtub. and a pressure detector, and the control circuit section includes a temperature setting section, a correction temperature setting section, a comparison circuit section for comparing an output of the temperature detector and an output of the correction temperature setting section, and the comparison circuit. the temperature sensor is set at a position y ₁ a certain distance below the water surface of the bathtub, and the pressure sensor is set at a position to detect the water depth y of the bathtub. At the same time, the bath apparatus is configured such that the output of the temperature setting section is corrected by the correction temperature setting section based on the ratio y ₁ /y of the position y ₁ of the temperature sensor and the water depth y. 2. The bath apparatus according to claim 1, wherein a temperature detector and a temperature setting section are connected, and the boiling temperature can be automatically set by storing an initial temperature in the temperature setting section.