JPH0875243A - Safety device for bath boiler - Google Patents

Abstract

PURPOSE: To detect circulation abnormality in circulation water of a bath boiler using no special part. CONSTITUTION: A bath temperature detected by a bath temperature detector 8 which reaches that set by a bath temperature setting device 10 to stop the heating of a heat exchanger 6 is compared with that after a fixed time passes and if the temperature after the fixed time passes is larger than that when the heating of the heat exchanger is stopped exceeding a fixed value, circulation is judged to be abnormal.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a safety device for a bath kettle that heats a bath bath water by a pump while heating it with a bath heat exchanger to uniformly boil the bath bath water up to a set bath temperature.

[0002]

2. Description of the Related Art In order to eliminate the temperature difference between the top and bottom of the bath water, the bath water is heated by a bath heat exchanger while being circulated by a pump, and the bath water is heated to a uniform temperature inside the bath bath. Exists. In such a bath, if the pump stops operating and the circulation stops, the circulating water will partially boil and the temperature difference between the upper and lower baths in the bath will increase. Make sure that the pump is really working while it is running.

In order to confirm that the circulation pump is really operating by the circulation pump drive signal, a flow switch (hereinafter referred to as flow SW) for detecting flowing water is provided in the circulation water channel, and by turning on / off the flow SW. , Confirm that the circulation pump is working.

[0004]

However, in the conventional structure, the foreign matter in the circulating water adheres to the flow SW and the flow S
There is a problem in that the flow SW continues to be turned on even if the W9 operation unit is stuck and does not move and the operation is stopped suddenly while the circulation pump is being driven, and the circulation abnormality of the circulating water cannot be detected.

In order to solve the above problems, an object of the present invention is to provide a safety device for a bath, which can detect and display a circulation abnormality without using a flow switch.

[0006]

In order to achieve the above object, a safety device of a bath according to the present invention comprises a circulation pipe for connecting an instrument body and a bath, and a circulation pipe connected to the circulation pipe. A circulation pump that circulates circulating water, a heat exchanger that heats the circulating water, a bath temperature detection unit installed at the inlet or the outlet of the heat exchanger, and a bath temperature setting unit that sets a bath boiling temperature, Heating continuation determining means for outputting a heating control signal to the heat exchanger by two signals of the bath temperature detecting means and the bath temperature setting means, and the heating continuation determining means sends a heating stop signal to the heat exchanger. A first bath temperature storage means for storing a signal of the bath temperature detection means at the time of output, and a time delay means which is activated by a heating stop signal output by the heating continuation determination means and outputs an output signal after a fixed time. Second bath temperature storage means for storing the signal of the bath temperature detection means when the signal of the time delay means is output, storage temperature of the first bath temperature storage means and storage of the second bath temperature storage means An abnormality determination means for calculating a temperature difference and an abnormality display means for displaying a circulation abnormality according to a determination result of the abnormality determination means are provided.

[0007]

According to the present invention, with the above-mentioned structure, the heating continuation judging means judges that the bath temperature detected by the bath temperature detecting means is equal to or higher than the bath boiling temperature set by the bath temperature setting means. An abnormality determination means based on the bath temperature stored by the first bath temperature storage means when the heat exchanger stops heating and the bath temperature stored by the second bath temperature storage means after a fixed time of combustion stop by the time delay means. Calculates the bath temperature gradient after the combustion is stopped, and if the calculation result is larger than a constant value, it is judged as a circulation abnormality and the abnormality display means displays the circulation abnormality.

[0008]

1 is a block diagram showing an embodiment of the present invention.
Is bath bath 2 is bath pot body, bath bath 1 and bath pot body 2
Are connected by a hot water outlet side circulation pipe 3 and a water supply side circulation pipe 4. A circulation hoop 5 is provided on the water supply side circulation pipe 4.
, The heat exchanger 6 is connected to the circulation pump 5,
The hot water outlet circulation pipe 3 is connected to the heat exchanger 6.

A bath temperature detector 8 is installed between the circulation pump 5 and the heat exchanger 6, and detects the water temperature in the bath 1 through the water supply side circulation pipe 4 and the circulation pump 5 and converts it into an electric signal. Then, the data is input to the control device 12 inside the bath hook body 2. 9 is a remote controller for remotely controlling the bath main body 2,
A bath temperature setting device 10 which is a bath temperature setting means and a display unit 11 which is an abnormality display means are provided.

The bath temperature set by the bath temperature setting device 10 is converted into an electric signal and input to the control device 12. A heat exchanger heating means 7 is composed of a burner portion 7a for burning gas and a burner control means 7b for controlling the amount of gas to the burner 7a.

The control device 12 stores the heating continuation judging means 13 for judging whether or not to heat the heat exchanger 6 and the bath temperature at the time when the heating stop signal is outputted from the heating continuation judging means 6. The bath temperature storage means 14, the second bath temperature storage means 16 for storing the bath temperature after a fixed time after the heating stop signal is output, the first bath temperature detection means 14, and the second bath temperature storage means 16. It comprises an abnormality determination means 17 for determining the circulation abnormality of the circulating water based on the stored temperature and displaying the circulation abnormality on the abnormality display portion.

Next, the principle of the circulation abnormality determination will be described with reference to FIG. While heating the heat exchanger 6 while driving the circulation pump 5, the temperature detected by the bath temperature detector 8 is bath 1
The water temperature in the water supply side circulation pipe 4 as an alternative value of the water temperature in the inside is detected. Therefore, the detected temperature at this time gradually rises. When the bath temperature detected by the bath temperature detector 8 exceeds the bath temperature set by the bath temperature setting device 10 and the heating of the heat exchanger 6 is stopped, the heat exchanger 6 stores heat during heating, Since the heat capacity of the water in the bath 1 is much larger than the heat capacity of the exchanger 6, the temperature detected by the bath temperature detector 8 hardly rises even if the heat exchanger 6 releases the accumulated heat after the heating is stopped. .

If the circulation pump 5 does not operate and the heat exchanger 6 is heated, the bath temperature detector 8 detects the temperature of the water in the heat exchanger 6 which is heated without circulation. Because of that it rises sharply. The bath temperature detected by the bath temperature detector 8 exceeds the bath temperature set by the bath temperature setting device 10, and even if heating of the heat exchanger 6 is stopped, if the circulation pump 5 is not operating, the heat exchanger 6 Water temperature is heat exchanger 6
Continues to rise due to residual heat. Then, pay attention to the difference in the bath temperature rise dT after the combustion is stopped.

Next, the operation of the safety device for the bath with the above-described construction will be described with reference to the flowchart of FIG.
The heating continuation determination means 13 compares the outputs of the bath temperature detector 8 and the bath temperature setting device 10 during heating of the heat exchanger 6,
When the temperature detected by the bath temperature detector 8 is higher than the bath temperature set by the bath temperature setting device 10, a heating stop signal is output. When the burner control means 7b receives the heating stop signal, the fuel supply to the burner 7a is stopped and the burner 7a is extinguished. At this time, the circulation pump 5 continues to be driven without stopping.

When the heating stop signal is input, the first bath temperature storage means 14 stores the signal of the bath temperature detector 8. When the combustion stop signal is input, the time delay means 15 outputs a storage instruction signal to the second bath temperature storage means 16 after a fixed time. Upon receiving the storage instruction signal, the second bath temperature storage means 16 stores the signal of the bath temperature detector 8. When the temperature of the second bath temperature storage means 16 exceeds the temperature of the first bath temperature storage means 14 by a certain value or more, the abnormality determination means 17 determines that there is a circulation abnormality, and circulates it on the display unit 11 in the remote controller 9. Display that something is wrong.

Circulating water is abnormally circulated because the circulating pump 5 is abnormally stopped by locking or the like, the circulating passage cross-sectional area is reduced by dents or the like on both circulating pipes 3, 4, or both circulating pipes 3 of the bath 1 It is conceivable that the opening with 4 is blocked. Further, this abnormality detection is possible not only when boiling water from the water temperature shown in FIG. 2, but also when reheating when the water is cooled thereafter.

[0017]

As is apparent from the above description, in the safety device of the bath according to the present invention, the hot water temperature detected by the bath temperature detecting means is equal to or higher than the bath boiling temperature set by the bath temperature setting means. When the heating continuity determining means determines that the heating is stopped, the bath temperature stored in the first bath temperature storage means is compared with the bath temperature stored in the second bath temperature storage means after a fixed time after the heating is stopped, and heating is performed. If the bath temperature after a certain period of stop is greater than the bath temperature immediately after the combustion is stopped by a certain value or more, it is determined that the pump is not operating, and the abnormality display means can display the abnormality of the circulation pump. It is said that the bath temperature detecting means is always equipped in the bath pot that heats the bath up to the set temperature, and it is possible to reliably detect the circulation abnormality without installing an extra device such as the flow SW. There is an effect.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a safety device for a bath according to an embodiment of the present invention.

FIG. 2 is a bath temperature change characteristic diagram showing the principle of the abnormality determination of the pump of the device.

FIG. 3 is a flowchart for determining an abnormality of a pump of the device.

[Explanation of symbols]

 5 Circulation Pump 6 Heat Exchanger 8 Bath Temperature Detector 10 Bath Temperature Setting Device 13 Heating Continuity Judging Means 14 First Bath Temperature Means 15 Time Delay Means 16 Second Bath Temperature Means 17 Abnormality Means

Claims (1)

[Claims] 1. A pipe for connecting the body of the equipment and the bath
A circulation pump connected to the circulation pipe to circulate the circulating water in the circulating pipe, a heat exchanger for heating the circulating water, a bath temperature detecting means installed at an inlet or an outlet of the heat exchanger, and a boiling bath. A bath temperature setting means for setting an elevated temperature, a heating continuation judging means for outputting a heating control signal to the heat exchanger by two signals from the bath temperature detecting means and the bath temperature setting means, and the heating continuation. The first bath temperature storage means for storing the signal of the bath temperature detection means when the determination means outputs the heating stop signal to the heat exchanger, and the heating stop signal output by the heating continuation determination means is activated for a certain period of time. A time delay means for outputting an output signal later, a second bath temperature storage means for storing the signal of the bath temperature detection means when the signal of the time delay means is output, and the first bath temperature Safety of a bath with an abnormality determining means for calculating the difference between the storage temperature of the storage means and the storage temperature of the second bath temperature storage means, and an abnormality display means for displaying a circulation abnormality according to the determination result of the abnormality determination means. apparatus.