JPH06100365B2 - Bath reheating device - Google Patents

Description

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

(B) Conventional Technology As an example of reheating bath water in a circulation flow path equipped with a circulation pump, there is one disclosed in Japanese Patent Laid-Open No. 63-21438, and in this case, reheating bath water. At the time of operation, the circulation of bath water is detected by the running water switch provided in the circulation flow path to prevent the water from being heated. On the other hand, the circulation pump is called a self-priming type, and if it is first primed, it can self-prime again by supplying water in the bath even after empty operation, and it is possible to operate.
When there is water in the bathtub and the pump is operated, it will self-prime and the running water switch will turn on, and when there is no water in the bathtub that will not self-priming even when the pump is running and the running water switch will not turn on. There is.

And 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, but in the case of judging by turning on / off the running water switch, If the pump is operated a little more due to the ingress of air into the inside, the running water switch will turn on, but it will stop before that, or there will be cases where the running water switch will not turn on but the pump will run idle for a long time. There is.

(C) Problems to be Solved by the Invention The present invention includes a heat exchanger for heating by a burner, and a reheating circulation flow path for forcibly circulating and heating water in a bathtub by a pump. The purpose is to accurately detect whether or not the self-priming of the circulation pump is possible at the start of operation.

(D) Means for Solving the Problems In the present invention, a reheating circulation flow path for performing reheating by forcibly circulating the bath water in the bathtub with a pump is provided, and the reheating circulation flow path is provided at an appropriate position. A heat exchanger, a running water switch, and a water level detecting pressure sensor in the bath are each equipped with a control means for driving and controlling the circulation pump, and the control means is provided after the rotation pump starts rotating. Even when the running water detection signal is not output, the circulation pump is configured to continue rotating when the pressure detected by the pressure sensor reaches the set pressure.

(E) Action During the reheating operation After starting the operation of the circulation pump, first, the running water in the additional heating circulation passage is detected by the output of the running water switch, and if the running water switch detects running water, the burner is ignited. When the reheating operation is performed and one-way water is not detected, the output of the pressure sensor is detected by the above control means, and when the detected output reaches the set pressure, the circulation pump is continuously rotated. Perform additional driving.

(F) Embodiment First, an embodiment of the present invention will be described with reference to FIG. 1 by taking a bath water heater as an example. (1) is a bath water heater main body, and an additional case heat exchanger ( 3) and the heat exchanger (4) for hot water supply are arranged side by side, and the gas burners (5) (6) for heating are respectively installed below these heat exchangers.

Further, the hot water supply heat exchanger (4) is provided with a hot water supply passage (7) and a hot water supply passage (8) which are connected to a water supply source such as a water supply, and a bath is provided from the middle of the hot water supply passage (8). The hot water supply channel (9) is branched.

On the other hand, in the additional heat exchanger (3), a forward path (12) connected to the water supply pipe (11) opened to the side wall of the bathtub (10) and a water absorption pipe (13) also opened to the side wall, and A reheating circulation flow path (16) consisting of a return path (15) equipped with a circulation pump (14) is connected in the middle.

Further, in the return path (15), a well-known flowing water switch (17) is installed downstream of the circulation pump (14), and a pressure switch (18) is installed upstream of the circulation pump (14). ) Is attached.

The bath hot water supply passage (9) is provided with a pair of electromagnetic on-off valves (19).
The check valve (22) is connected to a proper place of the forward path (12) through the (20) and the check valve (21), and the check valve (22) is located upstream of the connecting portion of the forward path (12). It is configured to be installed and to pour hot water into the bathtub (10) through the hot water supply passage (9) for the bath and the outward passage (12).

(23) is a water amount sensor for detecting the water supply amount, (24) is a vacuum breaker, (25) is a controller (not shown), and the gas burners (5) and (6) are based on input signals from the pressure sensor (18) and the like. , A circulation pump (14), electromagnetic on-off valves (19) (20), and the like.

Thus, when pouring the water into the bathtub (10), the solenoid opening / closing valves (19) (20) are opened and the gas burner (6) is burned by a pouring start operation by a controller (not shown) to supply water. Hot water is supplied to the bathtub (10) through the passage (7) -hot water heat exchanger (4) -bath hot water supply passage (9) -outward passage (12) -water supply pipe (11).

Then, the pouring amount is counted by the flow rate sensor (23), and when it reaches the set amount, the combustion of the gas burner (6) is stopped, the electromagnetic opening / closing valves (19) (20) are closed, and the pouring is stopped. Next, the circulation pump (14) is activated to fill the reheating circulation channel (16) with water, and then the circulation pump (14) is deactivated, and the pressure sensor (18) is used to set the water level in the bath (10). Solenoid valve (19) (20)
Open and pour again. Simultaneously with this pouring, the pressure sensor (18) detects the water level, and when the set water level is reached, the electromagnetic on-off valves (19) (20) are closed and pouring is stopped.

The pressure sensor (18) detects a negative pressure in the reheating circulation channel (16), and detects the water level in the bath (10) by this pressure. The electromagnetic on-off valve (20) Is for preventing the inflow of air from the vacuum breaker (24) into the reheating circulation flow path (16).

On the other hand, when the water level in the bathtub (10) reaches the set water level, the circulation pump (14) is operated, and the hot water in the bathtub (10) is heated by a temperature sensor (not shown) provided at an appropriate position in the additional heating circulation flow path (16). If the temperature is detected and it does not reach the set temperature, the gas burner (5) is ignited and burned to heat the bath water, and if it is the set temperature, the circulation pump (14) is stopped and the gas burner (5) is burned. To end the reheating operation.

Further, when the additional heating operation is performed by the operation of the controller after the pouring operation, as shown in the flow chart of FIG. 4, the circulation pump (14) is first operated, and the control means (25) causes the running water switch ( When the output of 17) is detected and the running water in the additional heating circulation channel (16) is detected by this, the gas burner (5) is ignited and burned to perform the additional heating operation.

On the other hand, when the running water switch (17) does not detect running water, the control means (25) sets a timer for a predetermined time, detects the output of the pressure sensor (18), and detects this output (negative pressure). ), As shown in FIG. 2, after the operation of the circulation pump (14) is started and before the above-mentioned timer expires,
Generally, when the set pressure indicated by A in FIG. 2 is reached in about 10 seconds, the gas burner (5) is ignited and burned to perform additional heating operation, and when the bath water reaches the set temperature by this, circulation occurs. Stop the pump (14) and extinguish the gas burner (5). In addition, B in the figure is a period during which the air in the reheating circulation channel (16) escapes, and generally varies from 30 seconds to 60 depending on the length of the pipe.
It is about a second, and normal operation is performed after this.

On the other hand, if the water level in the bathtub (10) is mistakenly lower than the mounting position of the water suction pipe (13) at the start of the pouring operation, the running water switch (17) does not detect running water, and
As shown in FIG. 3, since the output of the pressure sensor (18) does not reach the set pressure A within the predetermined time, the control means (25)
In addition to stopping the additional heating operation, an alarm such as no water is given to prevent the empty heating operation.

(G) Effect of the Invention With the configuration according to the present invention, the above-mentioned additional heating circulation flow path is detected by performing running water detection during the additional heating operation in the additional heating circulation flow path using the pressure sensor that detects the water level in the bathtub. Even if air is mixed in or the reheating circulation flow path is long and it takes time for the circulation pump to self-prime, it can be accurately detected and the reheating operation can be performed. Compared with the case of detecting running water in the additional heating circulation channel by using it, it is possible to prevent the trouble that additional heating cannot be performed for the above reason as much as possible.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of a bath reheating device according to the present invention, and FIG.
FIG. 3 and FIG. 3 are also characteristic diagrams for explaining the operation, and FIG. 4 is a flowchart for similarly explaining the operation. (3) ... Heat exchanger for reheating, (10) ... Bathtub, (14) ...
… Circulation pump, (16)… Additional circulation flow path, (17)… Flow switch, (18)… Pressure sensor, (25)… Control means.

Claims (1)

[Claims] 1. A reheating circulation passage for forcedly circulating bath water in a bathtub by a pump for reheating, and a heat exchanger, a running water switch, and the bathtub at appropriate places in the reheating circulation passage. In each of which is equipped with a pressure sensor for detecting water level inside, a control means for driving and controlling the circulation pump is provided, and the control means is provided so that a running water detection signal is not output from the running water switch after the circulation pump starts rotating. Also, when the pressure detected by the pressure sensor reaches a set pressure, the circulation pump is continuously rotated, which is a bath reheating device.