JPH02169954A - Bath boiler with hot water supplier - Google Patents

Abstract

PURPOSE:To obtain a desired bath tub hot water temperature in a short time regardless of the set value of a set temperature for the bath tub hot water by correcting to the side of higher temperature the setting of hot water supply temperature for a mixing valve with respect to the temperature that is set by bath tub water temperature setting means. CONSTITUTION:Control means B52 corrects the set temperature for a mixing valve 36 with respect to the set temperature set by bath tub water temperature setting means 47 and outputs the correction to control means A46. The control means A46 is inputted the signal of the set temperature of the mixing valve 36 that is corrected by control means B52 and the signal of the set temperature of boiling in a circulation circuit 39 which is not corrected and at the same time the control means A46 is inputted the signals from a mixing valve thermistor 41 and circulation thermistor 42 to control the hot water supply by the mixing valve 36 and the boiling temperature of a circulation circuit 39. The control means B52 thus raises the set value of temperature setting for the mixing valve 36 by the heat quantity that is radiated during the hot water supply up to a bath tub 31 via a hot water supply circuit 37 so that it is possible to heat the hot water by the circulation circuit 39 after the hot water supply and obtain a desired hot water supply and obtain a desired hot water temperature in the bath tub.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a bathtub with a water heater that is equipped with a mixing valve and that performs everything from supplying hot water to a bath to boiling water in the bathtub.

2. Description of the Related Art In a conventional bathtub with a water heater of this type, as shown in FIG.
The outgoing pipe 19 and the return pipe 20 form a circulation circuit 9 by the heat exchange coil 21 and the circulation pump 10. Water is supplied to the hot water supply can 3 through an inlet pipe 4, and the boiled hot water is discharged through a hot water outlet pipe 5. The water inlet pipe 4 and the hot water outlet pipe 5 are also connected to a mixing valve 6, and the hot water heated to an appropriate temperature by the mixing valve 6 passes through the solenoid valve 8 and the edge cutting means 14.
guided by. The hot water supply circuit 7 is composed of a mixing valve 6, a solenoid valve 8, and a edge cutting means 14. The three-way switching valve 15 is connected to the outgoing pipe 19 and switches between the hot water supply circuit 7 and the circulation circuit 9. The water level sensor 13 is provided in the return pipe 20, and outputs a signal to start hot water supply when the water level in the bathtub 1 is lower than a set value, and outputs a signal to stop hot water supply when the water level is higher than the set value. The mixing valve thermistor 11 is provided in the mixing valve 6 and is used to control the temperature of the mixing valve 6.

Further, the circulation thermistor 12 is provided in the return pipe 20 and is used for temperature control when bath water is boiled by the circulation circuit 9.

The circulation pump 10 is installed closer to the bathtub 1 side than the three-way switching valve 15 on the outgoing pipe 19, and when hot water is being supplied, the three-way switching valve 15 is switched to the hot water supply circuit 7 side, the solenoid valve 8 is opened, and the circulation pump 1 is turned off.
0 is operated to mix the hot water in the hot water supply can 3 and the water in the water inlet pipe 4 at the mixing valve 6, and the water is mixed with the water in the bathtub 1 through the solenoid valve 8, edge cutting means 14, three-way switching valve 15, circulation pump 1o, and outgoing pipe 19. supply hot water to When boiling water in the bathtub, the three-way switching valve 15 is switched to the circulation circuit 9 side, and the circulation pump 10 is operated to connect the heat exchange coil 21, the three-way switching valve 15, and the circulation pump 1o.
, the outgoing pipe 19, the bathtub 11, the return pipe 20, and the heat exchange coil 21 to circulate the bathtub water. The control means A16 controls hot water supply and boiling by inputting the temperature set by the bathtub water temperature setting means 17. That is, during hot water supply ζ, the temperature of hot water supplied by the mixing valve thermistor 11 is set by the bathtub water temperature setting means 17. Control the mixing valve 6 so that the set temperature is reached,
When heating up the bathtub water, the temperature of the bathtub water is controlled by the circulation thermistor 12 so that it becomes the temperature set by the bathtub water temperature setting means 17. The burner 18 heats the hot water supply can 3 and also heats the heat exchange coil 21 . FIG. 5 shows an example of the relationship between the bathtub water temperature setting and the bathtub water temperature upon completion of hot water supply. The higher the bathtub water temperature setting is, the lower the bathtub water temperature is when hot water supply is completed than the set value. This is because the mixing valve 6 is installed inside the bathtub 2 with water heater.
The main reason for this is that the temperature of hot water whose temperature has been adjusted in the bathtub 1 decreases due to heat radiation while flowing through the outgoing pipe 19 to the bathtub l. Therefore, if the temperature set by the bathtub hot water temperature setting means 17 is 38°C, the bathtub temperature will be 37.9°C when the hot water supply is completed, and then the temperature will be raised to exactly 38°C when the boiling is completed. However, the set temperature in the bathtub water temperature setting means 17 is set to 4.
If the temperature is 6°C, the bathtub temperature will be 45°C when hot water supply is completed, and then the temperature will rise to exactly 46°C when boiling is completed.

Problems to be Solved by the Invention However, in the above configuration, since the mixing valve 6 is provided in the bathtub 2 with a water heater, the hot water whose temperature has been adjusted by the mixing valve 6 does not flow into the bathtub 1. 19, the temperature drops due to heat radiation, so in order to reach the desired bathtub temperature, it takes a long time for the bathtub temperature to reach the set value by boiling in the circulation circuit 9. In addition, if the mixing valve thermistor 11 is installed in the bathtub 1, the above problem can be solved, but it is necessary to modify the bathtub 1 when installing the bathtub 2 with a water heater. In addition, the operation of the mixing valve thermistor 11, which is the key to temperature control, must be checked on-site after installation, which makes the work, including the installation work, extremely troublesome.

The present invention solves such conventional problems, and provides a bathtub with a water heater that can obtain a desired bathtub temperature in a short time regardless of the set value of the bathtub water temperature.

Means for Solving the Problems In order to solve the above problems, the bathtub with water heater of the present invention includes a mixing valve that supplies hot water to the bathtub at a predetermined temperature by mixing hot water, and a hot water supply system that is installed in the mixing valve. a mixing valve thermistor that detects the temperature of the bath water, a circulation circuit that circulates bath water with a circulation pump and heats it with a heat exchange coil, a circulation thermistor installed in the middle of the circulation circuit that detects the temperature of the bath water, and a mixture valve thermistor that detects the temperature of the bath water. a bathtub water temperature setting means for setting;
It is equipped with a control means A that controls the mixing valve and the circulation pump so that the bath water reaches a set temperature by manually inputting signals from the mixing valve thermistor and the circulation thermistor, and controls the mixing valve at the temperature set by the bath water temperature setting means. A control means B is provided for outputting a signal for correcting the hot water supply temperature setting to a higher temperature side to the control means.

Operation With the above configuration, the control means B inputs the set value of the bathtub water temperature setting means, sets the temperature of the mixing valve higher than the temperature set by the bathtub water temperature setting means, and adjusts the bathtub water temperature when hot water supply is completed. Correct.

EXAMPLE Hereinafter, an example of the present invention will be described based on the accompanying drawings. In FIG. 1, a bathtub 32 with a water heater is connected to a bathtub 31 by an outgoing pipe 49 and a return pipe 50, and the outgoing pipe 49 and the return pipe 50 form a circulation circuit 39 by a heat exchange coil 51 and a circulation pump 40. Water inlet pipe 34 to hot water supply can body 33
Water is supplied through the hot water supply pipe 35, and the boiled hot water is discharged through the hot water discharge pipe 35. In addition, the water inlet pipe 34 and the hot water outlet pipe 35 are connected to the mixing valve 3.
6, and the hot water whose temperature is controlled by the mixing valve 36 is led to the edge cutting means 44 through the 11M1 valve 38. The hot water supply circuit 37 includes a mixing valve 36, a solenoid valve 38, and an edge cutting means 44.
It consists of The three-way switching valve 45 is connected to the outgoing pipe 49 and switches between the hot water supply circuit 37 and the circulation circuit 39. The water level sensor 43 is provided in the return pipe 50, and outputs a signal to start hot water supply when the water level in the bathtub 31 is lower than a set value, and outputs a signal to stop hot water supply when the water level is higher than the set value. The mixing valve thermistor 41 is provided in the mixing valve 36 and is used to control the temperature of the mixing valve 36. Further, the circulation thermistor 42 is provided in the return pipe 50 and is used for temperature control during boiling by the circulation circuit 39. The circulation pump 40 is installed on the bathtub 31 side of the three-way switching valve 45 on the outgoing pipe 49, and when hot water is being supplied, the three-way switching valve 45 is switched to the hot water supply circuit 37 side, the 1i magnetic valve 38 is opened, and the circulation pump 40 is operated. Can body 33 for hot water supply
The hot water and the water in the inlet pipe 34 are mixed with the mixing valve 3G, and the solenoid valve
8, edge cutting means 44, three-way switching valve 45, circulation pump 40
, hot water is supplied to the bathtub 31 via an outgoing pipe 49. When boiling water in the bathtub, the three-way switching valve 45 is switched to the circulation circuit 39 side, and the circulation pump 40 is operated to cool the heat exchanger tube coil 5.
1. Bathtub water is circulated through a path including a three-way switching valve 45, a circulation pump 45, an outgoing pipe 49, a bathtub 31, a return pipe 50, and a heat exchange coil 51. The m control means B52 is connected to the control means A46 and the bathtub hot water temperature setting means 47, and corrects the set temperature of the mixing valve 36 with respect to the temperature set by the bathtub hot water temperature setting means 47, and outputs the corrected temperature to the control means A46. The control means A46 inputs the signals of the set temperature of the mixing valve 36 corrected by the control means B52 and the boiling set temperature of the circulation circuit 39 which is not corrected, and also inputs the signals of the mixing valve thermistor 41 and the circulation thermistor 42. The water supply by the mixing valve 36 and the boiling in the circulation circuit 39 are controlled. The burner 48 heats the hot water supply can 33 and also heats the heat exchange coil 51.

FIG. 2 shows a circuit diagram of the control means B52.

The control means B52 is composed of a microcomputer 53 (hereinafter referred to as microcomputer). The bathtub water temperature setting value of the bathtub water temperature setting means 47 is input to the microcomputer 53.
The microcomputer 53 outputs the temperature setting value of the mixing valve 36 and the boiling water temperature setting value of the circulation circuit 39.

The operation of the above configuration will be described below with reference to the flowchart of the microcomputer 53 shown in FIG. First, input the bathtub water temperature setting value from the bathtub water temperature setting means 47 (St
) L, an example of an arithmetic expression for calculating the temperature setting value of the mixing valve 36 (S2) is shown below.

Y-3 [3≦41] Y-1,2* (S-41) +41 [5
>411S: Bathtub water temperature setting value Y: Temperature setting value of the mixing valve 36 The above calculation formula is for correcting the relationship between the bathtub water temperature setting in the conventional example shown in Fig. 5 and the bathtub water temperature at the completion of hot water supply. ,
In order to simplify the calculation, two linear equations are used with 41°C as the boundary. Then, the calculation result from the above calculation formula is sent to the control means A from the microcomputer 53 as the temperature set value for the mixing valve 36.
46 (S3).

Since there is no need to correct the boiling water temperature setting of the circulation circuit 39, the setting value of the bathtub water temperature setting means 47 is directly used as the boiling water temperature setting of the circulation circuit 39 by the control means A46.
Therefore, the control means A46 receives the output from the microcomputer 53 of the control means B52, and outputs the output to the hot water supply circuit 3 (S4).
7 and the temperature of the boiling water in the circulation circuit 39.

As described above, according to this embodiment, the hot water supply circuit 37
Control means B52 for increasing the temperature setting value of the mixing valve 36 by the amount of heat radiated to the bathtub 31 via the
By providing this, there is no need to perform boiling by the circulating circuit 39 after hot water is supplied, and also to perform ldeg as in the conventional case, and the desired bath water temperature can be obtained in a short time. Also, the mixing valve thermistor 41 is not provided in the bathtub 31, and the bathtub 3 with a water heater is used.
2, there is no need to modify the bathtub 31 when installing the bathtub 32 with a water heater, and the manufacturer can control the mixing valve thermistor 41, which is the key to temperature control, maintaining reliability. be able to.

In addition, although the control means B52 is constituted by the microcomputer 53, it may be constituted by a discrete circuit instead of the microcomputer 53, or the control means B52 and the control means A46 may be constituted by one microcomputer.

The maximum effect will be achieved if the temperature setting of the mixing valve 36 is calculated for each set value of the bath water temperature as in this embodiment, but if such performance is not required, for example, the temperature setting of the mixing valve 36 can be calculated every 2 degrees Celsius of the bath water temperature setting. Multi-step correction may be applied, such as correcting the temperature setting of the mixing valve 36.

Effects of the Invention As is clear from the description of the embodiments above, the bathtub with water heater of the present invention provides the following effects.

ill By providing a control means B that increases the temperature setting value of the mixing valve by the amount of heat radiated through the hot water supply circuit to reach the bathtub when hot water is supplied, boiling by the circulation circuit after hot water supply can be done as before. There is no need to increase the temperature by even 1 degree, and the desired bathtub temperature can be obtained in a short time.

(2) Since the mixing valve thermistor is not installed inside the bathtub but inside the bathtub with water heater, there is no need to modify the bathtub when installing the bathtub with water heater, and the mixing valve thermistor is the key to temperature control. Since the manufacturer can manage the information, it is possible to save time and effort during installation work and maintain reliability.

[Brief explanation of the drawing]

Fig. 1 is a block diagram of a bathtub with a water heater showing an embodiment of the present invention, Fig. 2 is a circuit block diagram of a control means B of the bathtub with a water heater, and Fig. 3 is a microcomputer as the control means B. FIG. 4 is a block diagram of a conventional bathtub with water heater, and FIG. 5 is a diagram showing the relationship between the bathtub water temperature setting of the conventional bathtub with water heater and the bathtub water temperature when hot water supply is completed. 31...Bathtub, 32...Bath pot with water heater, 36...Mixing valve, 37...Hot water supply circuit, 39...Circulation Circuit, 40...Circulation pump, 41...Mixing valve thermistor, 42.
... Circulation thermistor, 46 ... Control means A, 47 ... Bathtub water temperature setting means, 51 ...
... Heat exchange coil, 52 ... Control means B. Name of agent: Patent attorney Shigetaka Awano

Claims (1)

[Claims] A mixing valve that supplies hot water to a bathtub at a predetermined temperature by mixing hot water and water, a mixing valve thermistor installed in the mixing valve that detects the temperature of the hot water supply, and bath water that is circulated by a circulation pump and heated by a heat exchange coil. a circulation circuit for detecting the temperature of the bath water, a circulation thermistor provided in the middle of the circulation circuit for detecting the temperature of the bath water, a bath water temperature setting means for setting a desired bath temperature, and signals from the mixing valve thermistor and the circulation thermistor being inputted. A control means A that controls a mixing valve and a circulation pump so that the bath water reaches a set temperature, and a signal that corrects the hot water temperature setting of the mixing valve to a higher temperature side with respect to the temperature set by the bath water temperature setting means. A bathtub with a water heater equipped with a control means B that outputs the water to a control means A.