JPS636784B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bath device that heats water in a bathtub to a temperature suitable for bathing. By providing an arithmetic circuit that calculates the corresponding temperature to be set and controlling the combustor based on the temperature to be set, errors in the boiling temperature due to fluctuations in the amount of water, etc. are reduced.

An example of a conventional bathtub equipped with a hot water temperature sensor that detects the hot water temperature in the bathtub and that automatically stops the heat source such as a burner when the hot water temperature reaches a set temperature is as shown in Figure 1A. The temperature sensor 1 can be inserted into the bathtub 2 at an appropriate depth, or the hot water temperature sensor 1 can be installed on the bathtub 3 side, for example, between the communication pipes 4, 4' and the heat exchanger 5, as shown in FIG. There is something attached inside the jacket 6.

In the above-mentioned circulation type bathtub, the water at the bottom of the bathtub below the lower communication pipe 4' is hardly circulated and heated. There is a problem in that the boiling temperature after stirring fluctuates due to the influence of the water temperature at the inner bottom. In addition to the above-mentioned problem, the latter method also has the problem that there is almost no way to specify the amount of water to be supplied into the bathtub, and the boiling temperature varies due to changes in the amount of water.

The present invention has been made in view of the above-mentioned problems, and will be described below first with reference to FIG. 2.

A well-known bathtub 7 is located above and below a side wall 8 and connects a pair of communicating pipes 9 and 9'. This communication pipe is connected to a water jacket 12 of a heat exchanger 11 heated by a well-known gas burner 10, and a temperature sensor 13 is installed inside this water jacket. Reference numeral 14 denotes a control circuit for heating the water 17 in the bathtub 7 to a set temperature by controlling the opening and closing of a solenoid valve 16 provided in the gas supply path 15 to the gas burner 10 based on data from the temperature sensor 13 and the like. This control circuit will be explained below with reference to FIG.

Reference numeral 18 denotes a power transformer, which has a primary winding 19 connected to a commercial power source via a power switch 20, and a DC constant voltage circuit 26 consisting of a rectifier 24, a constant voltage transistor 25, etc., connected to a tap terminal 23 of a secondary winding 22. Connected.

27 is a 4-bit stored program type microcomputer which is an arithmetic circuit, and outputs 2
A D/A converter 29 is connected to inputs 8, 28..., and a bath 7 of the lower communication pipe 9' is connected to inputs 30, 30...
Mounting height setting circuit 3 consisting of a digital switch such as a decimal switch that inputs the communication height l ₁ to the
1, and inputs 32 and 32 are each connected to a temperature setting circuit 33, which is also a digital switch and inputs the temperature set by the user. For the switches of these mounting height setting circuits and temperature setting circuits, for example, a number representing the mounting height or a number representing the temperature is provided around the rotary knob, and the mark on the knob is aligned with the corresponding number. Configure it as you want.

And inputs 34, 34 have a pair of FETs 35,
35, an AC signal source 36, and the output of a flame detection circuit 39 consisting of a flame rod 38 and the like disposed in the flame hole 37 of the gas burner 10 are connected to the output 40, and the solenoid valve 16 and its driving transistor 41 are connected to the output 40.
A high-voltage transformer 46 is connected to the output 43, which has a secondary winding 44 connected to a discharge electrode 45 disposed in the flame hole 37, and a high voltage for sparking is supplied to this. Inverter circuit 47
and the switching transistor 48 of the igniter 49 are connected.

On the other hand, analog switches 51 and 51' are connected to the outputs 50 and 50, respectively, and these analog switches connect the negative input 54 of the comparator 53 whose positive input terminal 52 is connected to the output of the D/A converter 29, and the bathtub. A comparator is connected between the output of the temperature sensor 13 and the output of the water amount sensor 57, which is composed of a pressure sensor 55 that takes out the amount of water in the water as an analog amount, and an amplifier 56 that receives the output of this pressure sensor as an input. The output of the amplifier 56 and the output of the temperature sensor 13 are applied to the negative input 54 of the temperature sensor 53 at predetermined timing. The pressure sensor 55 is attached to the bottom of the water jacket 12, for example, as shown in FIG. The output of the comparator 53 is also connected to the input 58,
Water amount sensor 57 in synchronization with the above outputs 50, 50
Water volume data from the sensor and hot water temperature data from the temperature sensor are captured in digital quantities.

Next, the operation will be explained. First, when installing the instrument, the installation height setting circuit 31 is set according to the connection height of the lower communication pipe 9'. Next, after setting the desired water temperature using the temperature setting circuit 33, turn on the power switch 2.
0, first the microcomputer 27
According to a predetermined sequence program set in , the solenoid valve 16 is opened to supply gas to the gas burner 10, and at the same time, the igniter 49 is activated to cause discharge at the discharge electrode 45. When the flame detection circuit 39 detects ignition, the operation of the igniter is stopped and a steady heating operation begins.

On the other hand, in FIG. 2, the boiling temperature T of the water in the bathtub 7 after stirring can be expressed by the following logical formula.

T=V1t1+V2t2/V1+V2=V1t1+V2ts/V1+V2(t2≒ts
) ts=(V1+V2)T-V1t1/V2 Here, V1: Water amount in the non-circulating section V2: Water amount in the circulating section t1: Temperature in the non-circulating section t2: Temperature in the circulating section ts: Set temperature of the sensor section The above theoretical formula is If the boiling temperature is T, the total amount of heat required for boiling water is expressed as T x (V1 + V2), while the amount of heat in the non-circulating section is V1 x t1 (= initial water temperature), and the amount of heat in the circulating section is V2 x t2 (the boiling temperature of the circulating section), and therefore the total amount of heat is T×
(V1+V2)=V1t1+V2t2, which can be proven.

The above-mentioned non-circulating part is the inner bottom l1 of the bathtub 7 below the connecting part of the lower communicating pipe 9' in FIG.
The circulation part refers to the l2 part above the non-circulation part,
In addition, V1 and V2 are calculated by the microcomputer 27 based on data from the mounting height setting circuit 31 and the water amount sensor 57, and t1 corresponds to the initial water temperature, which is calculated by the microcomputer 27 after the ignition operation.
The boiling temperature T is read into the memory by the temperature setting circuit 33.

When the output of the temperature sensor 13 reaches the calculation result (ts) based on the above theoretical formula due to the combustion of the gas burner 10, the output 40 is reversed and the solenoid valve 1
6 is closed to stop combustion of the gas burner 10.

As described above, the bath device according to the present invention includes a circulation type bath pot that communicates with a bathtub through a pair of upper and lower communication pipes, a temperature sensor that detects the water temperature in the bathtub, and a water amount or water level in the bathtub. a water flow sensor for detecting the water flow rate, a mounting height setting means for setting the mounting height of the lower communication pipe, an output of the mounting height setting means, an output of the water flow sensor, and a temperature for inputting the temperature set by the user. An arithmetic circuit that calculates a set temperature suitable for bathing based on the output of the setting means and the output of the temperature sensor that detects the initial water temperature in the bathtub, and compares the output of the temperature sensor and the set temperature. This system is equipped with a control circuit that stops the combustion of the bathtub when the water temperature in the bathtub reaches a set temperature, which suppresses fluctuations in the boiling temperature due to changes in the initial water temperature and the amount of water in the bathtub. The water can be heated to a temperature set by the user.

[Brief explanation of the drawing]

1A and 1B are conventional examples, FIG. 2 is an explanatory diagram of the present invention, FIG. 3 is an electric circuit diagram, and FIG. 4 is a diagram corresponding to the claims. 7...Bathtub, 9,9'...Communication pipe, 13...Water temperature sensor, 14...Control circuit, 27...Microcomputer, 55...Water amount sensor.

Claims (1)

[Claims] 1. A circulating bath pot that communicates with the bathtub via a pair of upper and lower communication pipes, a temperature sensor that detects the water temperature in the bathtub, a water volume sensor that detects the amount or water level of the water in the bathtub, and communication between the lower part of the bathtub. An installation height setting means for setting the installation height of the pipe, the output of this installation height setting means, the output of the water flow sensor, the output of the temperature setting means for inputting the temperature set by the user, and the initial temperature inside the bathtub. An arithmetic circuit calculates a set temperature suitable for bathing based on the output of the temperature sensor that detects the water temperature, and compares the output of the temperature sensor and the set temperature, and the water temperature in the bathtub reaches the set temperature. The bath equipment consists of a control circuit that then stops combustion in the bath kettle.