JP2633178B2 - Reheating control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bath apparatus, and more particularly to a small-sized, large-capacity non-self-priming pump and a reheating control method for a bath apparatus incorporating a self-priming pump.

[0002]

2. Description of the Related Art In recent years, bath apparatuses have become widespread in which air bubbles can be jetted into a bathtub in order to improve a bathing effect such as recovery from fatigue and health promotion. As shown in FIG.
The lower end of the bathtub (B) is connected to the upstream end of the return path (1b) forming the circulation circuit (1), while the downstream part of the outward path (1a) forming the circulation circuit (1) is connected to the bathtub (1). B) are connected to discharge ports (12) (12) formed on the back and foot side walls. The circulation circuit (1) is provided with a so-called non-self-priming circulation pump (P ₀₁ ) which needs to be operated after bleeding air from the circuit. The reason why a non-self-priming type pump is used as the circulating pump (P ₀₁ ) is that if the pump requiring a large capacity is made a self-priming type, the size of the apparatus becomes large. A water heater is provided on the suction side of the circulation pump (P ₀₁ ).
The filling circuit (3a) drawn from (4) is connected.

[0003] Further, the circulation circuit (1) with forced circulation circuit formed so as to bypass a portion of the circuit (1 _C) is connected, to the forcible circulation circuit (1 _C) is Bath heat exchanger
(11) is provided. And the above forced circulation circuit (1 _C )
A small-sized self-priming circulating pump (P ₀₂ ) of a type that can be operated without bleeding air from the circuit is inserted into the pump.

[0004] The discharge formed on the side wall of the bathtub (B).
The outside air is sucked into the mouth (12) (12) through the on-off valve (14).
Air suction circuit (13) is connected. Non-self-priming type
Circulation pump (P₀₁) Is stopped and the self-priming circulation
(P ₀₂) Activates the suction port (B₁) → Return
(1b) → Circulation pump (P₀₁) → Circulation pump (P₀₂) → For bath
Heat exchanger (11) → Discharge port (12) → Enter with circuit connected to bathtub (B)
The bath water is forcibly heated by circulation and the inside of the bathtub (B) is reheated.
Will be

Further, the circulation pump (P ₀₂ ) is stopped, the other circulation pump (P ₀₁ ) is operated, and the on-off valve (1)
When valve 4 is opened, bath water circulates in circulation circuit (1), and air suction circuit (13) is created by the ejector effect of the jet water jetting from discharge ports (12) (12) into bathtub (B). The outside air is sucked from the tub, and is blown out into the bathtub (B). Thereby, the inside of the bathtub (B) becomes a bubble bath state.

[0006] However, the above-mentioned one has a problem that the durability of the bath heat exchanger (11) tends to be reduced. The above problem will be described in more detail. In the above-described apparatus, for example, a water flow detector (not shown) is provided in the forced circulation circuit (1 _C ) or the like, and the water flow detector outputs a water flow detection signal at the time of reheating when the self-priming circulation pump (P ₀₂ ) is operated. If not, the gas burner of the bath heat exchanger (11) is kept in the fire extinguishing state. In this way, it is possible to prevent the empty heating of the bath.

However, for example, immediately after filling with hot water, air bubbles may be mixed in a circuit circulating between the bathtub (B) and the bath heat exchanger (11). Above bathtub before hot water
This is because air often enters the circuit circulating between (B) and the bath heat exchanger (11), and the air may not be completely removed during filling with hot water. In this case, a circuit for circulating the bathtub (B) and the bath heat exchanger (11) (for example, a forced circulation circuit (1 _C )
The water flow detector installed in the bath heat exchanger (1) detects the circulating water containing air bubbles and outputs a water flow detection signal.
1) The gas burner heating starts to burn. Then, in the bath heat exchanger (11), the circuit portion through which the air bubbles pass is overheated as compared with the water passing portion, and this lowers the durability of the bath heat exchanger (11). is there.

The present invention has been made in view of the above points, and has been made in consideration of "a discharge port (12) and a suction port (B) provided on a constituent wall of a bathtub (B)".
₁ ) and a circulation circuit (1) having a non-self-priming circulation pump, and formed to bypass a part of the circuit on the outlet side of the circulation pump in the circulation circuit (1); A forced circulation circuit (1 _C ) including a bath heat exchanger (11) and a self-priming circulation pump, and a water flow detector disposed in a circuit through which circulating water flows during reheating, and Circulating the bathtub (B) and the bath heat exchanger (11) in the method of controlling the reheating of the bath apparatus so that the reheating operation is executed only when the detector is outputting the water flow detection signal. An object of the present invention is to prohibit the reheating operation when air is accumulated in the circuit, thereby preventing excessive heating of the bath heat exchanger (11) and preventing its durability from lowering.

[0009]

The technical means of the present invention for solving the above-mentioned problem is that "a self-priming circulating pump is maintained in a stopped state, and the other non-self-priming circulating pump is operated to perform a reheating operation. Was executed.]

[0010]

The above technical means operates as follows. When the non-self-priming circulating pump is activated during the reheating operation, the bathtub (B)
After entering the bath water from the suction port (B ₁ ) into the non-self-priming circulation pump, the bath water is discharged from the circulation pump. Then, the discharge water flows into a forced circulation circuit (1 _C ) formed to bypass a part of the circulation circuit (1) on the downstream side of the circulation pump. That is, the water discharged from the non-self-priming circulation pump passes through the bath heat exchanger (11), flows into the circulation circuit (1) again, and is supplied to the discharge port (12). Thereby, bathing water circulates between the bathtub (B) and the bath heat exchanger (11). Then, when the bathing water is circulated, a water flow detection signal is output from a water flow detector that detects the flow of the water, so that the gas burner corresponding to the bath heat exchanger (11) by the signal is similar to the above-described conventional one. The fuel is burned, whereby the reheating operation proceeds.

On the other hand, the bathtub (B) and the bath heat exchanger (11)
Air is mixed in the circuit that circulates
If the circuit is refilled with hot water in a state where the air is not completely evacuated, air bubbles staying in the upstream circuit of the non-self-priming circulating pump will bite into the pump and will not function. That is, bathtub (B) and heat exchanger for bath
The bath water does not circulate in the circuit circulating (11). Then, the water flow detector for detecting the presence or absence of the water flow in the circuit does not output the water flow detection signal, and the reburning burner does not burn. That is, the additional heating operation is prohibited.

[0012]

The present invention has the following specific effects. If air is accumulated in the circuit circulating between the bathtub (B) and the bath heat exchanger (11), the reheating operation is prohibited, and there is a concern that the bath heat exchanger (11) may be overheated. No heat exchanger for the bath
The decrease in durability of (11) can be suppressed.

[0013]

Next, an embodiment of the present invention will be described in detail with reference to FIG. The bubble bath apparatus employing the method of this embodiment employs the configuration shown in FIG. 2, and the basic configuration is the same as that of the above-described conventional example. In the bathtub (B), the discharge port
(12) Foot outlet (12a) and back outlet corresponding to (12)
(12b), and each discharge port has a forward path of the circulation circuit (1).
The branch circuits of (1a) are separately connected. Tub suction port (B) (B ₁₎ backward from (1b) is connected to the inlet side of the circulation pump of a large capacity non-self-priming (P _1), the outlet side of the circulation pump (P ₁₎ The forward path (1a) to be connected is branched at the branch point (Q), one of which is connected to the foot-side discharge port (12a), and the other is connected to the back-side discharge port (12).
b) to form a circulating circuit (1). The discharge ports (12a) and (12b) have an air suction circuit (1).
The downstream branch circuits of 3) are separately connected, and the path to the discharge port of the air suction circuit (13) is opened and closed by an on-off valve (14) inserted upstream of the branch point.

A filtration circuit provided in parallel with the circulation circuit (1)
(2) is a configuration in which a filtration container (20) is inserted as in the conventional example,
An inlet side and an outlet side of both ends a circulation pump filtration container (20) (P ₁₎ is connected, filtration direction of the filter container (20) is a circulating pump
This coincides with the forward direction of the circulation circuit according to (P ₁ ). In addition, a switching valve (31) is provided at the outlet side of the filtration vessel (20) in the filtration circuit (2).
However, a switching valve (32) is provided on the inlet side of the filtration vessel (20), a backwash circuit (3b) is connected to the switching valve (31), and a discharge circuit (3) is connected to the switching valve (32). 3c) is connected.

The bubble bath apparatus includes a water heater (4) and a bath heat exchanger (11). The water heater (4) is
The bypass circuit (4) from the water supply pipe (41) on the inlet side to the heat exchanger
3) is combined with a circuit to be heated (42) via a heat exchanger, which is a so-called bypass mixing method. Therefore,
By controlling the distribution amount by the control valve (46) inserted at the branch point of the water supply pipe (41) and the bypass circuit (43), the temperature of the hot water from the hot water circuit (44) is maintained at the set temperature. In this embodiment, the branch circuit (45) from the water supply pipe (41) is also joined to the filling circuit (3a) branched from the tapping circuit (44), and the switching control valve (33) is connected to this junction. ) Is inserted.
The opening of the switching control valve (33) is controlled by a servo motor (M).
(3a) the amount of hot water can be controlled, and a filling circuit (3a),
The tapping circuit (44) side or the branch circuit (45) side can be selectively communicated. Therefore, the filling circuit (3a)
And the branch circuit (45) only, and tap water as it is
(B), in which case the heated circuit (42)
Is not filled with cold water, so that the cold water sand phenomenon is unlikely to occur at the time of re-water supply.

The filling circuit (3a) includes a filling valve (30), a flow counter (34) for measuring a filling flow rate, and a pressure feeding hopper (5).
Are inserted in this order, and the downstream end thereof is connected to the upstream side of the self-priming pump (P ₂ ) of the forced circulation circuit (1c) for circulation heating described later. A switching valve (35) is provided at the junction of the filling circuit (3a) and the forced circulation circuit (1c). This switching valve (35) is in a state in which the filling circuit (3a) is shut off and only the forced circulation circuit (1c) is connected, and the filling circuit (3a) is in a forced circulation circuit (1c). In this configuration, the pump (P ₂ ) and the circulation switching valve (15) are connected to both sides.

The pressure feed hopper (5) includes a valve device (52) housed in a valve chamber (51) in a casing (50) and an air chamber (53) connected to the valve chamber and opened to the atmosphere. ). An air suction port (54) is opened in a partition wall between the valve chamber (51) and the air chamber (53), and a valve seat port (55) is provided at a position facing the air suction port (54) and at an inlet of the valve chamber (51). ) Opens, during which time
A valve device (52) including a valve body facing the air suction port (54) and the valve seat port (55) is incorporated. The valve device (52) is always operated by a spring (not shown).
(55) is closed and the air suction port (54) is urged to open, and the water seat circuit (3a) opens the valve seat port (55) and closes the air suction port (54). Is a form that works as follows.

A downstream circuit (3a ₁ ) of the filling circuit (3a) is communicatively connected to the side wall of the valve chamber (51).
a ₁ ) and the air chamber (53) are connected to the communication pipe (57) into which the drain valve (56) is inserted.
Are connected to each other. The forced circulation circuit (1c) is a self-priming pump between the circulation switching valve (15) inserted in the back circuit of the circulation circuit (1) and the circulation switching valve (16) inserted in the foot circuit.
(P ₂ ) and a bath heat exchanger (11) are inserted.The inlet side of the self-priming pump (P ₂ ) is connected to the circulation switching valve (15), and the self-priming pump (P The outlet side of ₂ ) is connected to the bath heat exchanger (11), and a switching valve (35) is inserted between the self-priming pump (P ₂ ) and the circulation switching valve (15). A water flow switch (17), which is a water flow detector, is inserted at the outlet side of the self-priming pump (P ₂ ), and the circulation switching valve (16) and the discharge port (12a) are provided.
A pressure-type water level sensor (18) is inserted between and.
Therefore, the forced circulation circuit (1c) is changed from the circulation switching valve (15) to the switching valve (3
5) → self-priming pump (P ₂ ) → water flow switch (17) → bath heat exchanger (11) → circulation switching valve (16).

The water level sensor (18) detects the pressure corresponding to the water level in the bathtub (B) communicating through the discharge port (12a). The operation of the bubble bath apparatus having the above configuration will be described below. In this embodiment, each unit is controlled by a microcomputer, and the operation of each main unit will be described with reference to flowcharts shown in FIGS.

As shown in FIG. 9, in a step (71), it is monitored that a filling operation and a reheating operation are performed, and when the filling operation is performed, a "filling operation" described later is executed. ,
When the reheating operation is performed, the reheating operation described below is performed. [Reheating Operation] When the reheating operation is performed, a circuit as shown in FIG. 5 is established. That is, as shown in FIG. 5, the return path (1b) communicates with the filtration circuit (2), the outward path (1a) communicates with the forced circulation circuit (1c) through the circulation switching valve (15), and the discharge port (12).
b) shut off the side and discharge port (12a) by circulation switching valve (16)
Switching valve (31) (32) (35) and circulation switching valve (15) so that the forward path (1a) is connected to the side and the forced circulation circuit (1c).
Switch (16). Incidentally, the circulation changeover valve (16) is set to the attitude shown in FIG. 11, thereby, a circuit connecting with forced circulation circuit (1 _C) → connection port (29) → foot side of the discharge port (12a) is fully opened On the other hand, the circuit flowing from the outward path (1a) to the circulation switching valve (16) via the branch point (Q) is maintained in a narrowed state.

When the non-self-priming pump (P ₁ ) is operated in this state, the suction port (B ₁ ) → circulation pump (P ₁ ) → outgoing path (1a) → circulation switching valve (15) → forced circulation circuit (P ₁ ) 1 _C )
→ Circulation switching valve (16) → Circuit connected to discharge port (12a) and suction port (B ₁ ) → Circulation pump (P ₁ ) → Outgoing path (1
a) → Circulation switching valve (16) → Bath water circulates in both circuits connected to discharge port (12a). And the former circuit
When the water flow switch (17) outputs an ON signal with the flowing circulating water, the reheating burner corresponding to the bath heat exchanger (11) burns, thereby reheating the inside of the bathtub (B) until the temperature reaches the set temperature. The operation continues (see step (72)). At the time of this reheating, as described above, the circuit flowing from the forward path (1a) to the circulation switching valve (16) via the branch point (Q) is in a narrowed state. The amount of water flowing to the circulation switching valve (15) increases, and the water flow switch (17) operates reliably. Also, in this embodiment,
So it flowed directly into the circulation changeover valve (16) side from the branch point (Q) of water is mixed with hot water from the forced circulation circuit (1 _C) at the discharge side of the circulation changeover valve (16) I have.
Therefore, the high-temperature water supplied from the forced circulation circuit (1 _C) (hot water heated by the bath heat exchanger (11)) is injected into the bath (B) directly from the discharge port (12) Moreover, there is no fear that the high-temperature water is directly blown to the bather. As described above, by narrowing the branch point (Q) side by the circulation switching valve (16), the water flow switch (17) is reliably operated, and the high-temperature water from the forced circulation circuit (1 _C ) is not heated. Bathtub (B) to ensure mixing with bathtub water
This is to prevent hot water from gushing out.

When the inside of the bathtub (B) is refired to the set temperature, the reburning burner is extinguished and the circulation pump (P ₁ )
Is stopped, and thereafter, the process returns to the initial control for monitoring that the hot water filling operation and the reheating operation are performed. On the other hand, circulation pump
When (P ₁ ) is activated to check the output of the water flow switch (17) (step (73)), if the water flow switch (17) outputs an OFF signal, the circuit of FIG. 3 described later is established. After that, 10 liters of hot water is supplied to the bathtub (B), and a remaining water determination executed at the time of filling operation described later is performed. Then, predetermined control such as hot water supply to the bathtub (B) is performed until it is determined that there is remaining water, and thereafter, first to third air bleeding operations to be performed at the time of automatic filling described later are performed. As a result, a state in which the circulation pump (P ₁ ) functions effectively is ensured, and the reheating operation is executed again from the beginning.

If an operation of the bubble operation is performed during the above-described reheating operation, both of these operations proceed simultaneously. In this case, as shown in FIG. 10, the circulation switching valve (15) is connected to the forward path (1a).
Is maintained in a state in which the branch point (Q) side, the forced circulation circuit (1 _C ) side, and the discharge port (12b) side are communicated with each other.
In both cases, the circulation switching valve (16) maintains all circuits connected to the valve (16) in a fully open state, and in this state, opens and closes the on-off valve (14) of the air suction circuit (13), and furthermore, circulating pump non self-priming _{(P 1)} and the self-priming pump _(P 2)
Activate both. The circuit connecting the branch point (Q) to the circulation switching valve (16) is fully opened by operating the self-priming pump (P ₂ ) and the water flow switch (17).
This is because a reliable ON operation can be ensured.

[Regarding Hot Water Operation] A hot water operation is performed.
And a circulation pump (P₁) And self-priming pon
(P _Two) Is stopped and the filling valve (30) is opened
In both cases, the switching control valve (33) shuts off the branch circuit (45) and
When the road (44) is in communication with the filling circuit (3a), the switching valve
(35) is the circuit to both sides of the filling circuit (3a) and the forced circulation circuit (1c).
The circulation switching valve (15) is connected to the forward path (1a) while the
Cut off the junction (Q) side and discharge port (12b) and forced circulation circuit (1c)
And the circulation switching valve (16) is connected to the discharge port (12a).
Shut off the side and branch point (Q) between the forced circulation circuit (1c) and the forward path (1a)
Are set in a state where the sides are connected, and the switching valve (3
1) (32) is a state where the filtration circuit (2) and the return path (1b) side are connected.
Is set to As a result, as shown in FIG.₁)
Is filled with water from the discharge port (12b) side. At the time of this hot water,
The valve device (52) in the pressure feed hopper (5) is operated by hot water supply pressure.
To open the valve seat port (55) and close the air suction port (54).
Since the valve is in a valved state, hot water flows outside the pressure feed hopper (5).
It is not discharged and the hot water circuit (3a) is discharged from the valve chamber (51).
Downstream circuit (3a₁). In addition, at the time of this hot water filling, circulation
Circuit (1) and filtration circuit (2), and also forced circulation circuit (1c)
The whole is filled with hot water from the hot water circuit (3a)
Then, air purging of each circuit is performed.

In the initial stage of filling, the flow counter (3
4), and as shown in FIG.
Liters) of hot water is supplied to the bathtub (B). Thereafter, the filling valve (30) is closed to stop the filling operation, and as shown in FIG. 4, the switching valve (35) closes the filling circuit (3a) side and the forced circulation circuit (1c ), The circulation switching valve (15) connects the forced circulation circuit (1c) side and the discharge port (12b) side, and
With the branch point (Q) side of (1a) closed and the circulation switching valve (1
6) are connected to the forced circulation circuit (1c) side and the discharge port (12a) side so that the branch point (Q) side of the outward path (1a) is closed, and each is set, and the self-priming pump (P ₂ ) Is in operation. As a result, hot water in the bathtub (B) is sucked from the discharge port (12b) and discharged from the discharge port (12a), thereby detecting the presence or absence of residual water. That is, the forced circulation circuit (1c)
When the state in which the water flow switch (17) is "ON" is continued for a predetermined time (30 seconds) in the circulating state, the discharge ports (61) and (62) in FIG. If it is determined that there is residual water up to the water level of 12b), and conversely, if the water flow switch (17) is “OFF”, it is determined that there is no residual water.

When it is determined that there is no remaining water,
The filling operation of a fixed amount (10 liters) is performed again in the same procedure as above, and the remaining water determination is performed again. And when it is determined that there is no residual water in this determination,
The above operation is repeatedly performed until the water level in the bathtub (B) reaches the height of the discharge port (12b) and the water flow switch (17) is turned on. In other words, a fixed amount of hot water is intermittently filled until there is remaining water.

When it is determined that there is residual water in the residual water determination, after the first to third air bleeding operations described in detail below are performed, the filling water level is detected by the water level sensor (18). Meanwhile, the continuous filling operation is executed in the state of FIG. 3, and when the filling water level in the bathtub (B) reaches the set water level, the filling operation is completed. [First to third air bleeding operation] When it is determined that there is residual water during the above-mentioned intermittent filling, the circulating pump (P ₁ ) is set to an operating state, and the _first circulating circuit including the circulating pump (P ₁ ) is operated. (1) The air bleeding operation is executed, and it is checked whether or not the air bleeding is completed.

Therefore, steps (63) to (6) in FIG.
The operations up to 5) are performed. First, a water filling operation of a fixed amount (10 liters) is executed to further raise the water level in the bathtub (B) by a fixed amount. Thereafter, as shown in FIG. 5, the circulation pump (P ₁ ) is turned on, the return path (1b) communicates with the filtration circuit (2), and the outward path (1a) communicates with the forced circulation circuit (1c) side. At the same time, each part is set so that the discharge port (12b) side is shut off and the discharge port (12a) side is in communication with the return path (1b) and the forced circulation circuit (1c), and the first air bleeding operation is performed. Is done.

Thus, a circulation path of the suction port (B ₁ ) → return path (1b) / circulation pump (P ₁ ) → filtration circuit (2) is formed, and the outward path (1a) is connected to the discharge port (12a). Circuit, and the outward path (1a) and the discharge port (12b) are shut off, and the suction port (B
₁ ) → Circulation pump (P ₁ ) → Outgoing path (1a) → Circulation switching valve (15) → Forced circulation circuit (1c) → Circulation switching valve (16) → Discharge port (12a) . At this time, the circulation switching valve (16) is in a state where the flow rate from the outward path (1a) to the discharge port (12a) is reduced, and the circuit from the forced circulation circuit (1c) to the discharge port (12a) is set to a fully open state. Have been.

Therefore, when the hot water in the bathtub (B) is smoothly circulating through the circulation circuit shown in the figure by the operation of the circulation pump (P ₁ ), the circulation switching valve (1c) is provided to the forced circulation circuit (1c). A certain water flow from 15) to the circulation switching valve (16) is reliably generated. After the circulating pump (P ₁ ) is operated for a fixed time (10 seconds) and the first air bleeding operation is executed, steps (64) and (65) in FIG.
Is checked for air release for a certain period of time (20 seconds)
If the water flow switch (17) continues to be in the “ON” state, it is determined that the air bleeding of the circulation circuit has been completed, and then the above-described continuous filling operation is performed in the mode shown in FIG. 3, and the water level sensor (18) ), The continuous filling operation is stopped and filling is completed when the detected water level becomes higher than the water discharge ports (12a) (12b).

In the air release check, when the water flow switch (17) is turned off, there is an air bite in a part of the circulation circuit. So, in this case,
The circulation pump (P ₁ ) is stopped, the second air bleeding operation is performed, and then the third air bleeding operation of FIG. 7 using the self-priming pump (P ₂ ) is performed. The second air bleeding operation is, as shown in FIG. 6, a backwashing operation of the filtration vessel (20) of the filtration circuit (2) for a certain period of time, and the filtration inside the filtration vessel (20) where air tends to remain. By backwashing the member, air bleeding at this portion is ensured.

As shown in FIG. 6, the second air bleeding operation connects the backwashing circuit (3b) branched from the hot water filling circuit (3a) with the filtration circuit (2), and also connects the filtration circuit (2). ) And return
(1b) The switching valves (31) and (32) are set in a state where the side is shut off, and the filling valve (30) is opened to generate a backflow in the filtration circuit (2), and the discharge circuit (3c ) To drain water.

As shown in FIG. 8, this second air bleeding operation is performed when the air bleeding is determined to be defective in step (64) after the first time of the first air bleeding operation (water flow switch ( 17) is turned off). The third air bleeding operation is performed as shown in FIG.
(1b) and the filtration circuit (2), and the circulation switch valve (1
5) communicates only with the forward path (1a) and the forced circulation circuit (1c), and the switching valve (35) is set in a position that allows only the forced circulation circuit (1c) to communicate.The foot-side circulation switching valve (16) ) Is the forced circulation circuit (1
c) is set in a state where only the discharge port (12a) is communicated,
This is an operation for operating the self-priming pump (P ₂ ) with the circulation pump (P ₁ ) stopped. As a result, the entire circulation path is forcibly circulated, and the inside of the non-self-priming circulation pump (P ₁ ) and the inside of the filtration vessel (20) where backflow occurs are evacuated.

In the third air bleeding operation, the control operations from step (66) to step (68) in FIG. 8 are executed. In step (66), both the 15-second timer and the 5-minute timer are used. Turned on, then steps (67) (68)
The output state of the water flow switch (17) is monitored, and if the "on" state of the water flow switch (17) continues for 15 seconds during 5 minutes, it is determined that the third air release has been completed, and step (63) The following first air release operation is executed again.

When the first air bleeding operation is repeated a set number of times (20 times), it is determined that there is an abnormality, and an error is displayed. If the water flow switch (17) is not continuously turned on for 15 seconds during the execution of the third air release, the operation is continued for 5 minutes after the timer for 15 seconds is stopped and reset. When the switch (17) is turned “ON”, the 15-second timer is turned “ON” again, and the checks in steps (67) and (68) are executed.

If the water flow switch (17) does not turn on for 5 minutes, it is determined that there is something wrong with the circulation circuit, the self-priming pump (P ₂ ) is turned off, and an error message is displayed. You. As described above, by selectively using the circulating pump (P ₁ ) and the self-priming pump (P ₂ ), air biting and air bleeding in each part of the circulating path are eliminated, and as a result, the accuracy of the water level sensor (18) is reduced. High water level detection becomes possible,
The water is filled to a predetermined water level, and the non-self-priming circulating pump (P ₁ ) can reliably function in the additional heating operation after the completion of the filling and the bubble operation operation.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a conventional example.

FIG. 2 is an overall view of a configuration according to an embodiment of the present invention.

FIG. 3 is a state diagram of each part during a filling operation.

FIG. 4 is a state diagram of each part during a residual water detection operation.

FIG. 5 is a state diagram of each part at the time of a first air bleeding and reheating operation.

FIG. 6 is a state diagram of each part during a second air release operation.

FIG. 7 is a state diagram of each part during a third air release operation.

FIG. 8 is a flowchart showing a control operation at the time of filling water;

FIG. 9 is a flowchart showing a control operation at the time of reheating.

FIG. 10 is a diagram showing a case where a reheating operation and a bubble operation operation are simultaneously performed.
State diagram of each part

FIG. 11 is a detailed view of an arrangement portion of the circulation switching valve (16).

[Explanation of symbols]

(B) ・ ・ ・ Bathtub (12) ・ ・ ・ Discharge port (B ₁ ) ・ ・ ・ Suction port (P ₁ ) ・ ・ ・ Circulation pump (1) ・ ・ ・ Circulation circuit (P ₂ ) ・ ・ ・ Self-priming Type pump (1c) ・ ・ ・ Forced circulation circuit (15) (16) ・ Circulation switching valve (1c) ・ ・ ・ Forced circulation circuit

Claims (2)

(57) [Claims] And 1. A bath tub (B) discharge port formed in a configuration wall (12) and the suction port (B ₁₎ circulation circuit having a circulation pump connected and a non-self-priming the (1), the circulating circuit (1) is formed so as to bypass a portion of the outlet side circuit in the circulation pump and the bath heat exchanger (11) and a forced circulation circuit having a circulation pump self-priming (1 _C) And a water flow detector disposed in a circuit through which circulating water flows during reheating, and a bath apparatus that performs the reheating operation only when the water flow detector outputs a water flow detection signal. In the reheating control method, the self-priming circulation pump is maintained in a stopped state, and the reheating operation is performed while operating the other non-self-priming circulation pump. Wherein together is positioned in a forced circulation circuit water flow detector (1 _C), the add焚動operation while squeezing through water circulation circuit (1) which meet at the downstream end of the forcible circulation circuit (1 _C) 2. The reheating control method according to claim 1, wherein the reheating process is performed.