JPH0243976B2 - - Google Patents

Description

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

Conventional Structures and Problems Conventionally, bath equipment has often been a combination of a natural circulation bath pot and a bathtub, as shown in Figure 1, and each has been treated as having independent functions. However, in this natural circulation type bathtub, it is efficient to use the temperature distribution in the vertical direction inside the bathtub, so the only way to know when the water in the bathtub is boiling is by checking the time, and whether it is too hot or not. There were some flaws in usage, such as the water being lukewarm. Furthermore, even if a timer was used, it was difficult to automatically set the timer time because the water temperature varied depending on the season.

On the other hand, as a method for automatically detecting boiling, a method has been considered in which a pump is attached to the bathtub and forced circulation is used to uniformize the water temperature in the bathtub and detect the water temperature in the bathtub. These problems include the fact that the efficiency decreases when the temperature of the water is made uniform, the cost of the bathtub increases because a pump is used, and the electricity bill increases during use.

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

Composition of the Invention In order to achieve this object, the present invention provides a bathtub including a valve that opens and closes a fuel passage by an electric signal, a control circuit unit that controls the valve, a bathtub, and a drain that closes an outlet of the bathtub. At least two drain plugs comprising a plug and a drain plug cord connecting the drain plug and the bathtub.
The drain plug cord is provided with three or more temperature detectors.

With this configuration, boiling of water in the bathtub is detected by determining the temperature of two or more temperature detectors and the average temperature, and when a predetermined boiling state is reached, combustion is stopped and the water is lukewarm. It has the effect of causing combustion.

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 valve 5. Two upper and lower circulation ports 6 and 7 from the bathtub 1 are connected to a bathtub 8. A drain plug 10 for blocking a drain port 9 is connected to the bathtub 8 by a cord 12 from an upper mounting portion 11 and attached thereto. One temperature sensor 13 is attached to the cord 12 at a location above the water level normally placed in a bathtub, and a certain distance below the temperature sensor 13 (the distance is l).
Another temperature sensor 14 is installed so as to be located at .

Further, the control circuit section 4 passes through each amplifier circuit 15 and 16 as shown in FIG.
9 and is connected to a drive circuit 21.

The operation of the above configuration will be explained with reference to FIG. In FIG. 3, the temperatures of the two temperature detectors 13 and 14 are the same at the point at which water is filled in the bathtub and combustion begins, that is, at time zero. When combustion starts, hot water comes out from the circulation port 6 in FIG. 2, and a hot mass spreads near the water surface of the bathtub due to the draft. Therefore, the temperature of the temperature sensor 13 provided above rises first, and the temperature of the temperature sensor 14 provided below increases less. As time passes, the temperature of the upper temperature detector 13 becomes saturated. On the other hand, the temperature of the lower temperature detector 14 rises only gradually, but after a certain period of time, the high temperature layer spreading near the water surface begins to descend, causing the temperature to rise suddenly unlike before. . At this time, the respective outputs of the two temperature detectors are inputted to the differential amplifier circuit section 17 via the amplifier circuits 15 and 16, the average temperature is determined by the average calculation circuit section 18, and the temperature setting section 19 sets this output in advance.
The comparison circuit unit 20 compares the boiling temperature with
The drive circuit 21 closes the valve and stops combustion.

Next, even after boiling is completed, if the water is not used immediately, heat is radiated from the bathtub 8 and the heat exchanger 3 and the water boils down. As time passes, the temperature of the water becomes uniform due to diffusion. Also at this time, according to the present invention, the average temperature of the two temperature detectors 13 and 14 is calculated in the control circuit 4, so if the average temperature falls below the set value by a certain temperature, the valve 5 is opened. This makes it possible to start combustion, and even after boiling, you can always obtain comfortable hot water within a certain temperature range.

By controlling the above operations with a microcomputer, each temperature sensor value can be recognized,
Set the absolute value of each temperature sensor to the level,
It is also possible to reduce malfunctions. Furthermore, by increasing the number of temperature detectors, the range of variation with respect to the set temperature can be reduced.

Effects of the Invention As explained above, according to the present invention, there is provided a bathtub having a valve that opens and closes a fuel passage based on an electric signal, a control circuit that controls the valve, a bathtub and a drain plug installed in the bathtub. , consists of multiple temperature detectors attached to the cord connecting the drain plug and the bathtub, which detects the boiling water in the bathtub and maintains a constant level of hot water, which was difficult to control with a bathtub alone. By attaching the temperature sensor to the cord of the drain plug (or by integrating it), it does not get in the way, and boiling can be detected with just a simple temperature sensor without using a pump etc. Therefore, the cost is low and it saves energy.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a conventional bath device, 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 diagram showing temperature characteristics. It is a diagram. 1...Bath pot, 4...Control circuit section, 5...Valve,
8...Bathtub, 9...Drain port, 10...Drain plug, 1
2... Drain plug code, 13, 14... Temperature detector.

Claims (1)

[Claims] 1. A bathtub having a valve that opens and closes a fuel passage based on an electric signal, a control circuit unit that controls the valve, a bathtub, a drain plug that closes the drain port of the bathtub, and a drain plug that connects the drain plug and the bathtub. A bath device comprising a cord, at least two temperature detectors attached to the drain plug cord, and the temperature detector and the control circuit section connected.