JPH05118648A - Forcedly circulating bath boiler - Google Patents

Abstract

PURPOSE:To minimize the time for which a circulating pump is run for prevention of freeze by a method wherein the temperature of the bathwater is detected in a bathwater circulation channel and, on the basis of the detected temperature of the bathwater and the temperature of the environment that a means of detecting alarming temperature against hazardous freeze outputs, the time for which a circulating pump is made to work is controlled. CONSTITUTION:A controlling means 10, when turned on by an F-point switch 9 (means of detecting alarming temperature against hazardous freeze), actuates a circulating pump 6, thereby starting the pump circulation of the bathwater though a bathwater circulation circuit 4. A means of detecting bathwater temperature 8 (flow thermometer) monitors the temperature of the bathwater and, when the detected temperature rises high, the time for which the circulating pump 6 is to be run is altered even if the F-point switch 9 is ON. As shown by A in diagram, the pump circulation of the bathwater, turned on by the F-point switch 9, is turned off after an elapse of time (t0). Another example is shown by B, wherein, since the bathwater temperature has fallen close to 0 deg.C, the operation of the circulating pump 6 is continued for an additional time (DELTAt) even after the F-point switch 9 has been switched off and the circulating pump is stopped when the bathwater temperature has risen above 4 deg.C. As shown by C, when the flow thermometer 8 has shown a high rise in temperature for a certain period of time (t0+alpha) after both the F-point switch 9 and the circulating pump 6 have been turned on, the pump circulation of the bathwater is done for the period of time (t0+alpha).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a forced circulation type bath with a freezing prevention control means.

[0002]

2. Description of the Related Art Conventionally, the prevention of freezing of a forced circulation type bath kettle is
As shown in the time chart of FIG. 5, freezing dangerous temperature detecting means such as a temperature sensing switch (shown as an F point switch in FIG. 4)
When the ambient temperature is detected and the freezing danger temperature is reached, the operation is controlled so that the circulation pump 21 of the bath circulation circuit connecting the bath kettle and the bathtub is turned on and off.

[0003]

However, in the above-mentioned conventional method, unnecessary freezing prevention operation is performed because it depends only on the freezing dangerous temperature detecting means for detecting the ambient temperature regardless of the combustion operation of the equipment. There were many things. In other words, there has been a problem that the freeze prevention operation is performed even when the water temperature in the bath circulation circuit is not in danger of freezing not long after the combustion operation is stopped.

According to the present invention, the bath circulation circuit is provided with hot water temperature detecting means (frothermo), and both signals from the freezing dangerous temperature detecting means and the hot water temperature detecting means enable the minimum and effective freezing prevention operation. The purpose is to provide the forced circulation bath kettle.

[0005]

The present invention has the following constitution in order to achieve the above object.

That is, a bath circulation circuit for connecting a heat exchanger and a bath is provided, and a circulation pump provided in the bath circulation circuit is associated with freeze dangerous temperature detecting means for detecting an ambient temperature to perform freeze prevention operation. In, the bath circulation circuit is provided with hot water temperature detecting means for detecting hot water temperature, and the hot water temperature detecting means is associated with a circulation pump, and the pump circulation time is determined based on signals from the freezing dangerous temperature detecting means and the hot water temperature detecting means. The feature is that it is controlled.

[0007]

[Function] When the ambient temperature is lowered, the freezing danger temperature detection means is turned on, the circulation pump is operated, and the pump circulation is started,
The water temperature is monitored by the hot water temperature detecting means, and when the water temperature is high, the circulation pump is stopped after a certain period of time to stop unnecessary operation. Further, if the water temperature is low, for example, around 0 ° C., the pump circulation is continued. If the water temperature is low, the pump circulation is continued even after the freezing dangerous temperature detecting means is turned off. If the water temperature becomes 4 ° C. or more, the circulation pump is turned off. And

Since the pump circulation time is controlled by the signal from the freezing dangerous temperature detecting means and the hot water temperature detecting means in this way, the freeze prevention operation can be minimized.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention,
FIG. 2 is an electric circuit diagram of a main part, and 1 is a forced circulation type bath kettle equipped with a heat exchanger 2 and a gas burner 3. 4 is bathtub 5
Is a bath circulation circuit that connects the heat exchanger 2 and the heat exchanger 2, and is provided with hot water temperature detection means 8 (hereinafter referred to as "frothermo") for detecting the hot water temperature, such as the circulation pump 6, the water flow switch 7, and the thermistor. Reference numeral 9 is a freezing dangerous temperature detecting means (hereinafter referred to as an F point switch) for detecting the ambient temperature. Reference numeral 10 is a control means composed of a microcomputer (CPU),
It is associated with the circulation pump 6, the water flow switch 7, the hot water temperature detecting means 8, the F point switch 9, the gas solenoid valve 11 and the like.

Next, the operation will be described with reference to the time charts of the freeze prevention operation shown in FIGS.

When the F-point switch 9 is turned on, the circulation pump 6 starts operating, and when the bath circulation circuit 4 starts pump circulation, the water temperature is monitored by the flow thermo 8 and the circulation pump 6 is adjusted according to the water temperature condition. Control driving.
That is, even if the F-point switch 9 is ON, if the water temperature detected by the Frothermo 8 is high, as shown in part A of the pump circulation,
_{After 0} hours, the circulation pump 6 is turned off. If the water temperature is near 0 ° C, as shown in part B, the O of the F point switch 9
The operation of the circulation pump 6 is continued for Δt time even after the FF. When the water temperature reaches 4 ° C or higher, the circulation pump 6 is turned off.

Further, when the F point switch 9 is ON, the circulation pump 6
Is turned on, and if the Frothermo 8 detects a high temperature (for example, 20 ° C. or higher) for a certain period of time t ₀ + α, as shown in part C, the pump circulates for t ₀ + α time, which does not hinder normal combustion operation. To do so. The F point switch 9 is turned on continuously.
If the Frothermo 8 is continuously kept at 20 ° C. or higher, the circulation pump 6 is repeatedly turned on for t ₀ hours at every t ₁ hour as shown in the section D.

[0013]

As described above, according to the present invention, the operating time of the circulation pump is controlled based on the signal from the freezing dangerous temperature detecting means for detecting the ambient temperature and the hot water temperature detecting means for detecting the hot water temperature. Since this is done, the pump operation is performed when both the ambient temperature and the water temperature have fallen to the freezing danger temperature, and the effective minimum freeze prevention operation can be performed. Therefore, it has excellent effects such as power saving and noise reduction.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention.

FIG. 2 is an electric circuit diagram of a main part.

FIG. 3 is a time chart during freeze prevention operation.

FIG. 4 is a time chart of the freeze prevention operation.

FIG. 5 is a time chart at the time of the freeze prevention operation of the conventional example.

[Explanation of Codes] 1 forced circulation type bath kettle 2 heat exchanger 4 bath circulation circuit 5 bathtub 6 circulation pump 8 hot water temperature detection means 9 freezing dangerous temperature detection means 10 control means

Claims (1)

[Claims] 1. A bath circulation circuit for connecting a heat exchanger and a bath, and a circulation pump provided in this bath circulation circuit is associated with freeze dangerous temperature detection means for detecting an ambient temperature to perform freeze prevention operation. In, the bath circulation circuit is provided with hot water temperature detecting means for detecting hot water temperature, and the hot water temperature detecting means is associated with a circulation pump, and the pump circulation time is determined based on signals from the freezing dangerous temperature detecting means and the hot water temperature detecting means. A forced circulation bath kettle characterized by being controlled.