JPH0244147A - Additional heating device for bath - Google Patents

Abstract

PURPOSE:To perform additional heating after timely detecting a flow of water in an additional heating circulating line even when air is mixed in water in the circulating line or it takes a long period of time for a circulating pump to self-prime water due to a long circulating line by detecting the water flow in the additional heating circulating line by using a pressure sensor that detects the water level in a bath. CONSTITUTION:A pressure sensor 18 detects the negative pressure in an additional heating circulating line 16 to detect the water level in a bath 10, and an on-off solenoid valve 20 prevents air from entering the additional heating circulating line 16 from a vacuum breaker 20. When the water level in the bath 10 reaches the set level, a circulating pump 14 is put into operation, and a temperature sensor provided on an adequate position on the circulating line 16, not shown on the drawing, detects the temperature of hot water in the bath 10. When the hot water temperature does not reach the set temperature, a gas burner 5 is ignited to heat the water in the bath, and when it reaches the set temperature, the circulating pump 14 and combustion of the burner 5 are stopped to finish the additional heating operation.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a bath reheating device for reheating the bath water by forcibly circulating the bath water in the bathtub using a circulation pump.

(b) Conventional technology An example of a method for reheating bath water in a circulation channel equipped with a circulation pump is the one disclosed in Japanese Patent Application Laid-Open No. 63-21438. During operation, a water flow switch installed in the circulation flow path detects the circulation of water in the bathtub to prevent dry heating. On the other hand, the above-mentioned circulation bomb is called a self-priming type, and if water is first primed and water is supplied into the bathtub even after dry operation, it will self-prime again and become operational, but if there is water in the bathtub. When you run the pump, it may eventually self-prime and turn on the water switch, or there may be cases where there is no water in the bathtub and no matter how long you run the pump, it will not self-prime and the water switch will not turn on.

In the former case, it is necessary to operate the circulation pump for a long time, and in the latter case, it is necessary to stop the pump immediately. Due to air entering the pump, if the pump is operated a little more, the water switch will turn on, but the water switch will stop before that, or the pump may run idly for a long time even though the water switch is not supposed to turn on. There is.

(C) Problems to be Solved by the Invention The present invention provides a bathtub equipped with a heat exchanger heated by a burner and a circulation passageway for heating the water in the bathtub by forcibly circulating it with a pump. The purpose of this is to accurately detect whether or not the circulation pump is capable of self-priming at the start of operation.

(=) Means for Solving the Problems The present invention is provided with an exchange circulation passage for reheating the water by forcibly circulating the bath water in the bathtub using a pump, and a heat source is installed at an appropriate place in the exchange circulation passage. In a device equipped with an exchanger, a water flow switch, and a pressure switch for detecting the water level in the bathtub, a control means for driving and controlling the circulation pump is provided, and this control means is
Even if a flowing water detection signal is not outputted from the flowing water switch after the rotation of the circulation pump starts, if the pressure sensor detects a predetermined pressure or more, the circulation pump is configured to continue rotating.

(*) Effect: After the circulation pump starts operating during reheating operation, first the flow water in the reheat circulation flow path is detected by the output of the flow water switch, and if the flow water switch detects flow water, the burner is ignited. If flowing water is not detected, the output of the pressure sensor is detected by the control means, and if this output is higher than a predetermined pressure, the circulation pump is continuously rotated to perform reheating operation. I do.

(F) Embodiment An embodiment of the present invention will first be explained based on FIG. 1 using a bath water heater as an example. 3) and hot water heat exchanger (4)
) are arranged in parallel, and gas burners (5) and (6) for heating are installed below each of these heat exchangers.

In addition, the hot water supply heat exchanger (4) is connected with a water supply channel (7) and a hot water supply channel (8>) which are connected to a water supply source such as water supply, and a hot water supply channel (8) is connected to the bath water supply channel from the middle of this hot water supply channel (8). The hot water supply path (9) is branched off.

On the other hand, the communication heat exchanger (3) has an outgoing path (12) connected to a water pipe (11) opened in the side wall of the bathtub (10),
Similarly, a reheating circulation flow path (16) is provided which is connected to a water intake pipe (13) opened in the side wall and is composed of a return path (15) equipped with a circulation pump (14) in the middle.

Further, the return path (15) is equipped with a well-known water flow switch (17) located downstream of the circulation pump (14), and a pressure switch (18) located upstream of the circulation pump (14). ) is attached.

In addition, the hot water supply path for the bath (9) has a pair of electromagnetic on-off valves (19).
) (20) and the check valve (21).
), and a check valve (22) is installed at the upstream side of the above-mentioned connection part of the outgoing path (12), and the hot water supply path for the bath (9) and the outgoing path (12) are connected to each other. , bathtub (1
0).

(23) is a water flow sensor that detects the amount of water supplied; (24) is a vacuum breaker; (25) is a controller (not shown); , circulation pump (14),
This is a control means that controls the electromagnetic on-off valves (19), (20), etc.

When pouring hot water into the bathtub (10), the solenoid valves (19) and (20) are opened and the gas burner (6) is ignited by a controller (not shown) to start pouring hot water. Hot water is supplied into the bathtub (10) via path (7) - hot water supply heat exchanger (4) - bath hot water supply path (9) - outward path (12) - water pipe (11).

Then, the flow rate sensor (23) counts the amount of poured molten metal, and when it reaches a set amount, the combustion of the gas burner (6) is stopped, and the electromagnetic on-off valves (19) and (20) are closed to stop the pouring of molten metal. Next, the circulation pump (14) is activated, and after filling the reheating circulation channel (16) with water, the circulation pump (14) is activated.
4) is stopped, and the pressure sensor (18) is used to stop the operation of the bathtub (1).
0) is detected, and if it is below the set water level, the electromagnetic on-off valves (19) and (20) are opened to pour the water again. Simultaneously with this pouring, the water level is detected by a pressure sensor (18), and when the set water level is reached, the electromagnetic on-off valves (19) and (20) are closed to stop pouring.

The pressure sensor (18) detects the negative pressure in the reheating circulation flow path (16) and uses this pressure to detect the water level in the bathtub (10), and the electromagnetic on-off valve (20) is for preventing air from flowing into the circulation passageway (16) from the vacuum breaker (24).

On the other hand, when the water level in the bathtub (10) reaches the set water level, the circulation pump (14) is activated, and a temperature sensor (not shown) installed at an appropriate position in the circulation channel (16) measures the temperature of the water in the bathtub (10). If the temperature has not reached the set temperature, the gas burner (5) is ignited and burned to heat the bath water, and if the temperature is the set temperature, the circulation pump (14) is stopped and the gas burner (5) starts burning. stop and end the traffic movement.

In addition, when reheating operation is performed by operating the controller after the above-mentioned pouring operation, the circulation pump (14) is first activated, the output of the water flow switch (17) is detected by the control means (25), and the output of the water flow switch (17) is detected. When detecting flowing water in the traffic circulation channel (16), the gas burner (5) is ignited and burned to perform reheating operation.

On the other hand, if the running water switch (17) does not detect running water, the pressure sensor (18) is activated by the control means (25>).
As shown in Fig. 2, if this output reaches the set pressure shown by A in the figure or higher, generally about 10 seconds after the circulation pump (14) starts operating, traffic operation is performed by igniting and burning the gas burner (5), and when the bath water reaches the set temperature, the circulation pump (14) is stopped and the gas burner (5) is extinguished. B in the figure is a period during which the air in the circulation passageway (16) is released, which varies depending on the length of the piping, but is generally about 30 to 60 seconds, after which normal operation resumes.

On the other hand, if the water level in the bathtub (10) is mistakenly lower than the installed position of the water suction pipe (13) at the start of the hot water pouring operation, the water flow switch (17) will not detect water flow, and As shown in Fig. 3, since the output of the pressure sensor (18) does not reach the set pressure A, the control means (25) stops the traffic operation, issues a water out warning, etc., and starts the dry-fire operation. To prevent.

(G) Effects of the Invention With the configuration according to the present invention, by detecting flowing water during reheating operation in the traffic circulation flow path using a pressure sensor that detects the water level in the bathtub, the above-mentioned reheat circulation flow path Even if it takes time for the circulation pump to self-prime due to air being mixed in or the traffic circulation path is long, this can be accurately detected and traffic operation can be performed, and only the conventional water flow switch can be used. Compared to the case of detecting the flowing water in the reheating circulation flow path using this method, troubles such as not being able to perform reheating due to the above-mentioned reasons can be prevented as much as possible.

[Brief explanation of the drawing]

Fig. 1 is a schematic configuration diagram of a bath reheating device according to the present invention;
3 and 3 are characteristic diagrams for explaining the operation. (3)...Transportation heat exchanger, (10)...Bathtub, (
14)... Circulation pump, (16)... Reheating circulation flow path, (17)... Water flow switch, (18)... Pressure switch, (25)... Control means. Figure 1 Figure 2 Applicant Sanyo Electric Co., Ltd. (1 other person) Attorney Takuji Nishino (1 other person) Figure 3 111 Hour 11 → -# Leap

Claims (1)

[Claims] (1) Equipped with a reheating circulation channel for reheating by forcibly circulating the bath water in the bathtub with a pump, and a heat exchanger, a water switch, and a water level in the bathtub at appropriate locations in this reheating circulation channel. In the device each equipped with a detection pressure switch, a control means for driving and controlling the circulation pump is provided, and the control means is controlled to operate as described above even if the water flow detection signal is not outputted from the water flow switch after the rotation of the circulation pump starts. A bath reheating device characterized in that a circulation pump is configured to continue rotating when a pressure sensor detects a predetermined pressure or higher.