JPH0523335B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a bath heating device that can switch between reheating a bath and hot water heating using a single heating section.

(Prior art) Conventionally, as shown in Utility Model Application Publication No. 60-48013, for example, a heating circuit is connected in the middle of a bath circuit that connects a heating section and a bathtub, and a bath is constructed using a single heating section. There is one that can switch between additional heating and hot water heating.

(Problem to be solved by the invention) In this conventional system, when performing high-capacity heating or when installing a radiator in the bathroom to dry and heat the bathroom, the circulating water temperature is 60°C to 80°C. The temperature becomes high, but if the bath operation is switched immediately after that, this high temperature water mixes with the bath water, the heating part is at a high temperature, it takes time for the hot water temperature detection means such as a thermistor to follow up, etc. This has the problem of detecting a temperature higher than the actual bath water temperature, and stopping the bath operation if the temperature is higher than the set temperature for reheating the bath.

The present invention solves the above-mentioned conventional problems, and aims to provide a bath heating device for both hot water heating and heating, which does not stop operation due to false detection of water temperature even if bath operation is started immediately after heating operation. It is said that

(Means for Solving the Problems) In order to achieve the above object, the present invention has the following configuration. That is, the heating circuit is connected through a switching means in the middle of the bath circuit that connects the heating part and the bathtub, and the hot water temperature detecting means is provided on the inlet side of the heating part, so that the temperature detected by the hot water temperature detecting means is equal to or higher than the set temperature. In the device which is provided with an operation stop means for stopping the bath operation when the temperature reaches 100 degrees, the device is provided with a time limit means that operates when the bath operation starts, and a means for determining whether or not the heating operation has been performed before the bath operation starts. If the determining means determines that the heating operation has been performed before the bath operation starts, the operating time of the timer is set longer than when it is determined that the heating operation has not been performed, and the timer is activated. During the operation, the operation stop means is inactivated and can be activated by time-up.

(Function) When the bath operation is started, if the heating operation has been performed immediately before that, the operating time of the timer is set to be long. Immediately after heating operation, the hot water in the heating circuit is at a high temperature, and even when switching to the bath circuit, there is high-temperature hot water in the common circuit and the heating section is also at a high temperature, so the high-temperature water Since the hot water temperature sensor cannot detect the accurate temperature of the bath water until the water in the bathtub enters the circuit, the timer is set in advance for a time longer than that required, and the timer is activated. Even if the temperature detected by the hot water temperature detection means exceeds the set temperature, the bath operation is not stopped. When the time limit means times up, the hot water temperature detector is in a state where it can correctly detect the temperature of the bath water, and when the detected temperature of the hot water temperature detecting means exceeds the set temperature after the time limit means times up, the bath operation is stopped.

On the other hand, if it is determined that heating operation has not been performed immediately before starting bath operation, the activation time of the timer is set shorter than when it is determined that heating operation has been performed, and bath heating is forcibly continued. Do not take longer than necessary.

(Embodiment) Fig. 1 is an overall configuration diagram of a hot water heater/bath heating device showing an embodiment of the present invention.
is a burner, 3 is a bathtub, and 4 is a radiator. A heating circuit 8 that communicates with a radiator 4 is connected in the middle of a bath circuit 5 that communicates between the heating part 1 and the bathtub 3 through three-way switching valves 6 and 7 that are switching means. 9 is a circulation pump, 10 is a water flow detection means, and 11 is a hot water temperature detection means such as a thermistor, which are provided on the inlet side of the heating section 1. During heating operation, the three-way switching valves 6 and 7 are switched to the heating circuit 8 side, and hot water is circulated between the heating section 1 and the radiator 4. The fact that the heating operation has been performed is stored in the microcomputer 12, and this memory is cleared when the bathing operation is performed thereafter. Also, this microcomputer 12
also serves as a timer (time limit means).

As shown in FIG. 2, at the start of the bath operation, the microcomputer 12 determines whether or not the heating operation has been executed immediately before, and if the heating operation has not been executed, the operating time (A) of the timer 12 is selected. If it has been executed, a longer activation time (B) is selected. After the circulation pump 9 is operated, when the water flow detection means 10 detects water flow, the timer 12 is started and the burner 2 starts combustion. continues combustion and operation of the pump 9.

If the heating operation was performed immediately before, at the beginning of the bath operation, the influence of hot water at a temperature of 60 to 80 °C existing in the flow path downstream of the three-way switching valve 6 and the tracking of the hot water temperature detection means 11. Due to the time it takes to reheat, the accurate temperature of the bath water cannot be detected, and a temperature that exceeds the set temperature for bath reheating (generally around 40℃) is detected, but operation is forced while timer 12 is operating. This eliminates the inconvenience of stopping the operation due to false detection that boiling is complete.

After the timer 12 times up, the temperature detected by the hot water temperature detection means 12 is compared with the set temperature, and combustion in the burner 2 is stopped when the set temperature is detected.

On the other hand, if it is determined that heating operation has not been performed immediately before starting bath operation, the operation time of timer 12 is shortened, so the amount of heating while forced combustion continues is small. 42
In the case of heat retention operation in which the heat is reheated to ℃, it is possible to prevent the inconvenience of the temperature already exceeding 42℃ when the timer 12 times up.

(Effects of the Invention) The present invention has the following excellent effects. In other words, it is possible to eliminate the inconvenience of erroneously detecting the water temperature and immediately stopping the bath operation when the bath operation is performed immediately after heating the circulating water to a high temperature during the heating operation. If the heating operation is not performed before the heating operation starts, the time during which the operation stop means is deactivated is short, and the rise in water temperature during that time is small, so the water temperature will greatly exceed the set temperature when the time limit means times up. There is no such thing.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention, and FIG. 2 is a flowchart showing the operation of the embodiment. 1... heating section, 3... bathtub, 5... bath circuit,
6, 7... Three-way switching valve (switching means), 8... Heating circuit, 9... Circulation pump, 11... Hot water temperature detection means, 12... Microcomputer (discrimination means,
timed means).

Claims (1)

[Claims] 1. A heating circuit is connected through a switching means in the middle of the bath circuit that connects the heating part and the bathtub, and a hot water temperature detecting means is provided on the inlet side of the heating part, and the temperature detected by the hot water temperature detecting means is higher than the set temperature. In the device which is provided with an operation stop means for stopping the bath operation when the bath temperature becomes too hot, it is provided with a time limit means that operates when the bath operation starts, and a means for determining whether or not the heating operation has been performed before the bath operation starts, and the method If the means determines that the heating operation has been performed before the bath operation starts, the operating time of the timer is set longer than when it is determined that the heating operation has not been performed, and the timer is activated. deactivates the operation stop means;
A bath heating device for both hot water heating and heating, characterized in that it can be activated by time-up.