JP7402725B2 - bath equipment - Google Patents

Description

The technology disclosed herein relates to a bath device.

Patent Document 1 describes a circulation path for circulating water in a bathtub, a tank provided in the circulation path for dissolving gas in water, and a first tank provided upstream of the tank in the circulation path. a pump, a second pump provided upstream of the first pump in the circulation path, a gas introduction section connected to the tank and capable of introducing gas into the tank, and a fine bubble discharge installed in the bathtub. A bath device is disclosed that includes a nozzle and a control device. The control device performs a gas introduction operation in which gas is introduced into the tank from the gas introduction part in a stopped state in which the driving of the first pump and the second pump is stopped, and after the end of the gas introduction operation, the control device controls the operation of the first pump and the second pump. Switching the pump from a stopped state to a driving state in which the first pump and the second pump are driving, and performing a water supply operation in which water from the tank is jetted into the bathtub through the microbubble discharge nozzle. It is configured to be able to perform fine bubble supply operation.

Japanese Patent Application Publication No. 2013-57466

In the bath device of Patent Document 1, during water supply operation, the first pump and the second pump are switched from a stopped state to a driven state, but no consideration is given to the order in which the first pump and the second pump are started to be driven. . If the first pump on the downstream side is started after starting the second pump on the upstream side, water pressurized by the second pump that is being driven will flow to the first pump when it is stopped. It will flow into. If you start driving the first pump in such a state, the parts that make up the first pump will wear out due to the influence of the pressurized water flowing into the first pump, reducing the durability of the first pump. do.

The present invention provides a technique that can improve the durability of the first pump of a bath device.

A bath apparatus according to an embodiment disclosed in this specification includes a circulation path for circulating water in a bathtub, a tank provided in the circulation path and dissolving a gas in the water, and a tank provided in the circulation path for dissolving gas in the water. a first pump provided upstream of the tank; a second pump provided upstream of the first pump in the circulation path; a gas introduction section capable of introducing a gas, a fine bubble discharge nozzle attached to the bathtub, and a control device, the control device being in a stopped state in which driving of the first pump and the second pump is stopped. A gas introduction operation for introducing gas into the tank from the gas introduction part, and after the end of the gas introduction operation, the first pump and the second pump are changed from the stopped state to the first pump and the second pump. a water supply operation in which water from the tank is spouted into the bathtub through the fine bubble discharge nozzle by switching to a driving state in which two pumps are driven; In the water supply operation, when switching the first pump and the second pump from the stopped state to the driving state, after starting the driving of the first pump, the driving of the second pump is stopped. Configured to start. In the water supply operation, when the driving rotation speed of the first pump reaches a first predetermined rotation speed that is smaller than a first maximum rotation speed that is a maximum rotation speed of the first pump, The driving of the second pump is started, and before the driving rotational speed of the first pump reaches the first maximum rotational speed, the driving rotational speed of the second pump is the maximum rotational speed of the second pump. 2, and when the driving rotation speed of the second pump reaches the second maximum rotation speed, the driving rotation speed of the first pump reaches the first rotation speed. The first pump is driven to the maximum rotation speed.

According to the above configuration, in the water supply operation, the control device starts driving the first pump provided on the downstream side, and then starts driving the second pump provided on the upstream side. Therefore, the water pressurized by the second pump that is being driven does not flow into the first pump that is stopped, and the first pump is not started to be driven in that situation. Therefore, it is possible to suppress the parts constituting the first pump from being worn out, and it is possible to improve the durability of the first pump.
Further, in the water supply operation, when the first pump starts to be driven, negative pressure acts on the second pump upstream of the first pump. In this case, water present in the second pump is drawn into the first pump. If you start driving the second pump after a lot of water in the second pump has been drawn into the first pump, the second pump will run idly and make noise because there is little water in the second pump. Occur. According to the above configuration, the control device starts driving the second pump when the driving rotation speed of the first pump reaches the first predetermined rotation speed during the water supply operation. In this case, compared to a configuration in which driving of the second pump is started when the driving rotation speed of the first pump reaches the first maximum rotation speed, the second pump is It is possible to reduce the amount of water drawn into the first pump side. Therefore, driving of the second pump can be started in a situation where a relatively large amount of water remains in the second pump. Therefore, it is possible to prevent the second pump from running idly and generating noise.

Another bath device disclosed in this specification includes a circulation path for circulating water in a bathtub, a tank provided in the circulation path and dissolving a gas in the water, and a tank for dissolving gas in the water in the circulation path. a first pump provided upstream of the first pump; a second pump provided upstream of the first pump in the circulation path; and a second pump connected to the tank for introducing gas into the tank. a microbubble discharge nozzle attached to the bathtub, and a control device, and the control device is configured to: A gas introduction operation for introducing gas into the tank from the gas introduction part, and after the end of the gas introduction operation, the first pump and the second pump are changed from the stopped state to the first pump and the second pump. is configured to be capable of executing a water supply operation in which water from the tank is spouted into the bathtub through the fine bubble discharge nozzle by switching to a driving state in which the microbubble discharge nozzle is activated. and, in the water supply operation, when switching the first pump and the second pump from the stopped state to the driving state, after starting the driving of the first pump, starting the driving of the second pump. It is configured as follows. In the water supply operation, when the driving rotation speed of the first pump reaches a first predetermined rotation speed that is smaller than a first maximum rotation speed that is a maximum rotation speed of the first pump, When the driving rotation speed of the second pump reaches a second predetermined rotation speed that is smaller than the second maximum rotation speed that is the maximum rotation speed of the second pump, the first pump starts driving. The first pump is driven such that the driving rotational speed of the first pump reaches the first maximum rotational speed, and when the driving rotational speed of the first pump reaches the first maximum rotational speed, the driving rotational speed of the second pump is The second pump is driven so that the driving rotation speed becomes the second maximum rotation speed.

According to the above configuration, in the water supply operation, the control device starts driving the first pump provided on the downstream side, and then starts driving the second pump provided on the upstream side. Therefore, the water pressurized by the second pump that is being driven does not flow into the first pump that is stopped, and the first pump is not started to be driven in that situation. Therefore, it is possible to suppress the parts constituting the first pump from being worn out, and it is possible to improve the durability of the first pump.
Further, in the water supply operation, when the first pump starts to be driven, negative pressure acts on the second pump upstream of the first pump. In this case, water present in the second pump is drawn into the first pump. If you start driving the second pump after a lot of water in the second pump has been drawn into the first pump, the second pump will run idly and make noise because there is little water in the second pump. Occur. According to the above configuration, the control device starts driving the second pump when the driving rotation speed of the first pump reaches the first predetermined rotation speed during the water supply operation. In this case, compared to a configuration in which driving of the second pump is started when the driving rotation speed of the first pump reaches the first maximum rotation speed, the second pump is It is possible to reduce the amount of water drawn into the first pump side. Therefore, driving of the second pump can be started in a situation where a relatively large amount of water remains in the second pump. Therefore, it is possible to prevent the second pump from running idly and generating noise.

It is a figure showing the composition of the bath system concerning an example (water supply state). It is a figure showing the composition of the bath system concerning an example (air introduction state). It is a figure showing the composition of the bath system concerning an example (reheating state). FIG. 2 is a diagram schematically showing a downstream pressure pump according to an example. It is a figure which shows typically the downstream pressurization pump based on a comparative example. It is a flowchart of the process performed in the fine bubble supply operation based on an Example.

(Example)
(Configuration of bath system 2)
The bath system 2 will be described with reference to FIGS. 1 to 3. The bath system 2 includes a heat source unit 10, a microbubble generation unit 50, a bathtub 130, and a control device 150. The heat source unit 10 is connected to a water supply source 200 and a microbubble generation unit 50. The micro bubble generation unit 50 is connected to the heat source unit 10 and the bathtub 130. A circulation connector 132 having a fine bubble discharge nozzle 134 is connected to the bathtub 130 . In addition, below, the case where water flows in the direction of the arrow shown in FIG. 1 is demonstrated as an example.

(Configuration of heat source unit 10)
The heat source unit 10 is a unit that heats water supplied from the water supply source 200 and supplies the heated water to the bathtub 130. The heat source unit 10 includes a heat source device 12, a water supply channel 20, a first return channel 22, and a first outgoing channel 24.

The upstream end of the water supply channel 20 is connected to a water supply source 200 such as a city water supply, and the downstream end of the water supply channel 20 is connected to the first return channel 22. A hot water filling valve 26 is provided in the water supply channel 20. The hot water filling valve 26 is a valve that controls the flow of water from the water supply channel 20 to the first return channel 22 .

The upstream end of the first return waterway 22 is connected to the fine bubble generation unit 50 (specifically, the second return waterway 60), and the downstream end is connected to the heat source device 12. In the first return waterway 22 , a circulation pump 30 and a water flow switch 32 are provided between the connecting portion between the first return waterway 22 and the water supply waterway 20 and the heat source device 12 . The circulation pump 30 is provided upstream of the water flow switch 32 and sends out water in the first return waterway 22 to the downstream side. The water flow switch 32 detects that water is passing through the first return waterway 22 . The heat source device 12 is, for example, a gas heat source device that heats water passing through the heat source device 12.

The upstream end of the first outgoing waterway 24 is connected to the heat source device 12, and the downstream end is connected to the fine bubble generation unit 50 (specifically, the second outgoing waterway 68).

(Configuration of micro bubble generation unit 50)
The micro bubble generation unit 50 includes a tank 52, a second return waterway 60, a second outflow waterway 68, a water supply waterway 74, a communication waterway 66, a spout waterway 64, a third return waterway 62, and a third waterway. It includes an outgoing waterway 70 and an air introduction path 100.

The tank 52 can store water therein. Inside the tank 52, a low water level electrode 52a and a high water level electrode 52b for detecting the water level in the tank 52 are installed. The water level detected by the low water level electrode 52a (hereinafter referred to as "lower limit water level") is lower than the water level detected by the high water level electrode 52b (hereinafter referred to as "upper limit water level"). When the low water level electrode 52a and the high water level electrode 52b come into contact with the water surface of the water stored in the tank 52, they output an ON signal to the control device 150. The tank 52 is used to generate air-dissolved pressurized water in which air is dissolved under pressure in water.

The upstream end of the second return waterway 60 is connected to the communication waterway 66, and the downstream end is connected to the heat source unit 10 (specifically, the first return waterway 22). The communication waterway 66 connects the first switching valve 80 and the second switching valve 82. One end of the third return water channel 62 is connected to the first switching valve 80, and the other end is connected to the bathtub 130 (specifically, the circulation connector 132). The upstream end of the jet water channel 64 is connected to the lower part of the tank 52, and the downstream end is connected to the first switching valve 80. The spout waterway 64 is provided with a check valve 84 that prevents water from flowing from the first switching valve 80 side to the tank 52 side. The first switching valve 80 is configured to operate in a first communication state (the state shown in FIG. 1) in which the jet water channel 64 and the third return water channel 62 are in communication, and in a second communication state (in which the jet water channel 64 and the communication water channel 66 are in communication). 2) and a third communication state (state of FIG. 3) in which the third return waterway 62, the ejection waterway 64, and the communication waterway 66 are in communication.

The upstream end of the second outgoing waterway 68 is connected to the heat source unit 10 (specifically, the first outgoing waterway 24), and the downstream end is connected to the second switching valve 82. One end of the third outgoing waterway 70 is connected to the bathtub 130 (specifically, the circulation connector 132), and the other end is connected to the second switching valve 82. The second switching valve 82 operates in a fourth communication state (the state shown in FIG. 1) in which the third outflow waterway 70 and the communication waterway 66 communicate with each other, and in a fifth communication state (the state in which the second outflow waterway 68 and the third outflow waterway 70 communicate with each other). 2 and 3).

The second outflow waterway 68 and the tank 52 are connected by a water supply waterway 74. The water supply waterway 74 is provided with a water supply control valve 86, an upstream pressure pump 88, and a downstream pressure pump 90. The water supply control valve 86 opens and closes the water supply channel 74. The water supply control valve 86 is provided upstream of the upstream pressure pump 88 . The downstream pressure pump 90 is provided downstream of the upstream pressure pump 88. The upstream pressure pump 88 and the downstream pressure pump 90 pressurize the water in the water supply channel 74 and send it out toward the tank 52 . In the following, the state of the bath system 2 when the first switching valve 80 is in the first communication state and the second switching valve 82 is in the fourth communication state (the state in FIG. 1) will be referred to as a "water supply state". The state of the bath system 2 when the first switching valve 80 is in the second communication state and the second switching valve 82 is in the fifth communication state (the state in FIG. 2) is referred to as an "air introduction state". The state of the bath system 2 when the first switching valve 80 is in the third communication state and the second switching valve 82 is in the fifth communication state (the state in FIG. 3) is referred to as a "reheating state". call.

The upstream end of the air introduction path 100 is open to the atmosphere, and the downstream end is connected to the tank 52. The air introduction path 100 introduces air into the tank 52. An air control valve 102 is provided in the air introduction path 100. Air control valve 102 opens and closes air introduction path 100.

(Configuration of upstream pressure pump 88, downstream pressure pump 90, and circulation pump 30)
Next, the downstream pressure pump 90 will be described with reference to FIG. 4. The downstream pressure pump 90 includes a casing 170, a blade portion 172, a shaft 174, a rotor 176, a coil 178, a first bearing 180, and a second bearing 182. The casing 170 is provided with a suction port 170a and a discharge port 170b. Water is sucked in from the suction port 170a in the direction of arrow A1, and water is discharged from the discharge port 170b in the direction of arrow A2. The vane portion 172 is connected to the shaft 174. A first bearing 180 is provided on the front side of the shaft 174, and a second bearing 182 is provided on the rear side of the shaft 174. In a normal state, the front end 174a of the shaft 174 is in contact with the first bearing 180, and a first gap S1 is provided between the rear end 174b of the shaft 174 and the second bearing 182. Note that the upstream pressure pump 88 and the circulation pump 30 have the same structure as the downstream pressure pump 90.

(Configuration of control device 150)
A control device 150 shown in FIGS. 1 to 3 controls the operation of each component of the heat source unit 10 and the microbubble generation unit 50. The control device 150 is configured to be able to communicate with a remote control (not shown) that can be operated by a user. Control device 150 includes memory 152. The control device 150 can perform reheating operation, fine bubble supply operation, etc. in accordance with the user's operation on the remote control.

(Operation of bath system 2)
Next, the operation of the bath system 2 will be explained. Below, the reheating operation and the fine bubble supply operation performed by the bath system 2 will be explained in order. At the time when the reheating operation and the fine bubble supply operation are started, the first switching valve 80 and the second switching valve 82 are in the third communication state and the fifth communication state, respectively (see FIG. 3). Further, the circulation pump 30, the upstream pressure pump 88, and the downstream pressure pump 90 are stopped, and the hot water filling valve 26, the water supply control valve 86, and the air control valve 102 are closed. In addition, in the reheating operation, the first switching valve 80 and the second switching valve 82 are maintained in the third communication state and the fifth communication state, respectively.

(Reheating operation)
In the reheating operation, when the first switching valve 80 is in the third communication state and the second switching valve 82 is in the fifth communication state (reheating state in FIG. 3), the water in the bathtub 130 is This is an operation in which heating is performed by the heat source device 12. When the user performs an operation on the remote controller to instruct execution of the reheating operation, the reheating operation is started. The control device 150 drives the circulation pump 30 and the heat source device 12. As a result, as shown in FIG. 3, water in the bathtub 130 passes through the circulation connector 132, the third return waterway 62, the communication waterway 66, the second return waterway 60, and the first return waterway 22 to the heat source device 12. Supplied. The water heated by the heat source device 12 is supplied to the bathtub 130 through the first outgoing waterway 24, the second outgoing waterway 68, the third outgoing waterway 70, and the circulation connector 132. The control device 150 starts driving the heat source device 12 and the circulation pump 30 when the temperature inside the bathtub 130 reaches the set temperature or when the reheating operation time that is preset as the time to execute the reheating operation time has elapsed. to stop. This ends the reheating operation.

(Fine bubble supply operation)
The fine bubble supply operation is an operation in which air-dissolved pressurized water is generated in the tank 52 and the generated air-dissolved pressurized water is supplied to the bathtub 130. When the user performs an operation on the remote controller to instruct execution of the fine bubble supply operation, the fine bubble supply operation is started. When the fine bubble supply operation is started, the first switching valve 80 and the second switching valve 82 are in the third communication state and the fifth communication state, respectively (see FIG. 3). Further, the circulation pump 30, the upstream pressure pump 88, and the downstream pressure pump 90 are stopped, and the hot water filling valve 26, the water supply control valve 86, and the air control valve 102 are closed. When the fine bubble supply operation is started, the control device 150 executes the process shown in FIG. 6.

In S10, the control device 150 executes an air introduction operation to introduce air into the tank 52. Specifically, the control device 150 switches the air control valve 102 to the open state, switches the first switching valve 80 to the second communication state, maintains the second switching valve 82 in the fifth communication state, and closes the water supply control valve. 86 in the closed state. This brings the bath system 2 into the air introduction state (see FIG. 2). Note that in S10 after passing through S42, which will be described later, the control device 150 switches the second switching valve 82 to the fifth communication state. Next, the control device 150 drives the circulation pump 30. As a result, as shown in FIG. 2, water is sucked out from the tank 52 and air is introduced into the tank 52 via the air introduction path 100. The water sucked out from the tank 52 is transferred to a spout waterway 64, a first switching valve 80, a communication waterway 66, a second return waterway 60, a first return waterway 22, a heat source device 12, a first outflow waterway 24, a second outflow waterway. 68, the second switching valve 82, the third outgoing waterway 70, and the circulation connector 132, and are discharged into the bathtub 130.

In S12, the control device 150 monitors whether the water level of the tank 52 becomes lower than the lower limit water level. When the water level of the tank 52 becomes lower than the lower limit water level, the control device 150 determines YES in S12, and the process proceeds to S14.

In S14, the control device 150 switches the air control valve 102 to the closed state and ends the air introduction operation. When S14 ends, the process proceeds to S20.

In S20, control device 150 starts water supply operation. The control device 150 switches the first switching valve 80 to the first communication state, switches the second switching valve 82 to the fourth communication state, and switches the water supply control valve 86 to the open state. As a result, the bath system 2 enters the water supply state (see FIG. 1).

In S22, the control device 150 starts driving the downstream pressure pump 90. The control device 150 controls the operation of the downstream pressure pump 90 so that the downstream pump rotation speed, which is the rotation speed of the downstream pressure pump 90, becomes a predetermined rotation speed. The predetermined rotation speed is a rotation speed smaller than the maximum rotation speed of the downstream pressure pump 90, and is, for example, about half the maximum rotation speed.

In S24, the control device 150 monitors whether the downstream pump rotation speed reaches a predetermined rotation speed. When the downstream pump rotation speed reaches the predetermined rotation speed, the control device 150 determines YES in S24, and the process proceeds to S26.

In S26, the control device 150 starts driving the upstream pressure pump 88. The control device 150 controls the operation of the upstream pressure pump 88 so that the upstream pump rotation speed, which is the rotation speed of the upstream pressure pump 88, becomes the maximum rotation speed. In this way, after the air introduction operation ends, the control device 150 controls the upstream pressure pump 88 and the downstream pressure pump 90 so that the driving of the upstream pressure pump 88 and the downstream pressure pump 90 is stopped. The state is switched from the stopped state to the driving state in which the upstream pressure pump 88 and the downstream pressure pump 90 are driven.

In S28, the control device 150 drives the downstream pressure pump 90 so that the downstream pump rotation speed becomes the maximum rotation speed. As a result, the upstream pressure pump 88 and the downstream pressure pump 90 are driven at the maximum rotation speed. As shown in FIG. 1, the water in the bathtub 130 is transferred to the circulation connector 132, the third outflow waterway 70, the second switching valve 82, the communication waterway 66, the second return waterway 60, the first return waterway 22, and the circulation pump. 30, the heat source device 12, the first outgoing waterway 24, the second outgoing waterway 68, and the water supply waterway 74, and are supplied to the tank 52. At this time, water pressurized by the upstream pressure pump 88 and the downstream pressure pump 90 is supplied from the water supply waterway 74 to the tank 52 . Inside the tank 52, air is dissolved in water under pressure. The air-dissolved pressurized water is then supplied from the tank 52 to the bathtub 130 via the jet water channel 64, the first switching valve 80, the third return channel 62, and the circulation connector 132. When the air-dissolved pressurized water passes through the fine bubble discharge nozzle 134 in the circulation connector 132, the pressure is reduced to below atmospheric pressure, and when it is ejected into the bathtub 130, the pressure is increased to atmospheric pressure, and the water in the bathtub 130 is fine bubbles are generated.

In S30, the control device 150 monitors that the water level of the tank 52 becomes equal to or higher than the upper limit water level. When the water level of the tank 52 is equal to or higher than the upper limit water level, the control device 150 determines YES in S30, and the process proceeds to S32.

In S32, the control device 150 switches the water supply control valve 86 to the closed state, stops the circulation pump 30, the upstream pressure pump 88, and the downstream pressure pump 90, and ends the water supply operation.

In S40, control device 150 increases the number of cycles by one.

In S42, the control device 150 determines whether the current number of cycles has reached a set number of times (for example, 5 times). When the number of cycles reaches the set number, the control device 150 determines YES in S42 and ends the process of FIG. 6. Note that, when ending the process of FIG. 6, the control device 150 switches the first switching valve 80 to the third communication state and switches the second switching valve 82 to the fifth communication state. On the other hand, if the number of cycles has not reached the set number of times, the control device 150 determines NO in S42, and the process returns to S10.

(Effects of this example)
Before explaining the effects of this embodiment, the operation of a bath system according to a comparative example will be explained. The configuration of the bath system of the comparative example is similar to the configuration of the bath system 2 of the present example (FIGS. 1 to 4). The bath system of the comparative example can perform reheating operation, fine bubble supply operation (air introduction operation and water supply operation), etc. similarly to the bath system 2 of the present example. The air introduction operation executed by the bath system of the comparative example is the same as the air introduction operation (S10 to S14 in FIG. 6) executed by the bath system 2 of the present example. However, in the bath system of the comparative example, in the water supply operation, when switching the upstream side pressurizing pump 88 and the downstream side pressurizing pump 90 from the stopped state to the driving state, the upstream side pump 88 and the downstream side pressurizing pump 90 are not driven. The starting order is different from that of the bath system 2 of this embodiment (S22 to S28). In the bath system of the comparative example, when switching the upstream pressure pump 88 and the downstream pressure pump 90 from the stopped state to the driving state during water supply operation, after starting the driving of the upstream pressure pump 88, the downstream pressure pump 88 is switched to the driving state. It is configured to start driving the side pressure pump 90. According to such a configuration, water pressurized by the upstream pressurizing pump 88 that is being driven flows into the downstream pressurizing pump 90 that is stopped. In this case, as shown in FIG. 5, the blade portion 172 and shaft 174 of the downstream pressure pump 90 are pushed down to the rear side by the pressurized water, and the rear end portion 174b of the shaft 174 is It comes into contact with the bearing 182. Note that a second gap S2 is provided between the front end 174a of the shaft 174 and the first bearing 180. Normally, after starting the drive of the downstream pressurizing pump 90, as the downstream pump rotation speed increases, the blade portion 172 and the shaft 174 move forward, and the front end 174a of the shaft 174 moves forward. comes into contact with the first bearing 180 on the front side. However, if the upstream pressure pump 88 is already being driven when the downstream pressure pump 90 is started to be driven, as in the bath system of the comparative example, the rear end 174b of the shaft 174 is connected to the second bearing. The downstream pressure pump 90 may continue to be driven while being in contact with the pump 182 . In this case, since the second bearing 182 is more likely to wear than the first bearing 180, the second bearing 182 wears out. As described above, in the bath system of the comparative example, as the water supply operation is repeatedly performed, the amount of wear on the second bearing 182 increases, and the blade portion 172 is damaged by parts housed in the casing 170 (e.g. , coil 178).

Therefore, in the bath system 2 of the present embodiment, the control device 150 controls the downstream pressure pump 90 when switching the upstream pressure pump 88 and the downstream pressure pump 90 from the stopped state to the driving state in the water supply operation. After starting the driving of the upstream pressurizing pump 88, the upstream pressurizing pump 88 is started to be driven. According to such a configuration, the water pressurized by the upstream pressure pump 88 that is being driven does not flow into the downstream pressure pump 90 that is stopped, and from this situation, the water pressurized by the upstream pressure pump 88 that is being driven does not flow into the downstream pressure pump 90 that is stopped. The drive never starts. Therefore, it is possible to suppress the parts (specifically, the second bearing 182) constituting the downstream pressure pump 90 from being worn out, and the durability of the downstream pressure pump 90 can be improved.

Further, in the water supply operation, when the downstream pump rotation speed of the downstream pressure pump 90 reaches a predetermined rotation speed (YES in S24), the control device 150 starts driving the upstream pressure pump 88. ing. In this case, compared to a configuration in which the upstream pressure pump 88 is started to be driven when the downstream pump rotation speed of the downstream pressure pump 90 reaches the maximum rotation speed, the upstream pressure pump 88 is driven. Before starting the process, the amount of water drawn from the upstream pressure pump 88 to the downstream pressure pump 90 can be reduced. Therefore, in a situation where a relatively large amount of water remains in the upstream pressure pump 88, driving of the upstream pressure pump 88 can be started. Therefore, it is possible to prevent the upstream pressure pump 88 from running idly and generating noise.

(correspondence)
The bath system 2 is an example of a "bath device." First return waterway 22, first outflow waterway 24, second return waterway 60, second outflow waterway 68, communication waterway 66, water supply waterway 74, spout waterway 64, third return waterway 62, and third outflow waterway 70 is an example of a "circulation route." The downstream pressure pump 90 and the upstream pressure pump 88 are examples of a "first pump" and a "second pump", respectively. Air is an example of a "gas." The air introduction path 100 and the air control valve 102 are an example of a "gas introduction section". The air introduction operation is an example of a "gas introduction operation."

Although each embodiment has been described in detail above, these are merely illustrative and do not limit the scope of the claims. The techniques described in the claims include various modifications and changes to the specific examples illustrated above.

(First Modification) In the above embodiment, two pressure pumps 88 and 90 are provided in the water supply channel 74. The number of pressure pumps provided in the water supply channel 74 may be three or more. In this case, in the water supply operation, the control device 150 may start driving the pressurizing pumps in order from the downstream side.

(Second Modification) In the above embodiment, the control device 150 continues to drive the circulation pump 30 in the fine bubble supply operation shown in FIG. The control device 150 may stop driving the circulation pump 30 in S14 of FIG. 6 . In this modification, the control device 150 starts driving the circulation pump 30 after S26, and then executes the processes from S28 onwards. That is, when switching the circulation pump 30, the upstream pressure pump 88, and the downstream pressure pump 90 from a stopped state to a driven state, the control device 150 starts driving the downstream pumps in order.

(Third Modification) S24 and S28 in FIG. 6 can be omitted. In this modification, the control device 150 drives the downstream pressure pump 90 in S22 so that the downstream pump rotation speed becomes the maximum rotation speed. In another modification, the control device 150 starts driving the upstream pressurizing pump 88 after YES in S24 of FIG. The operation of pressure pump 88 may also be controlled. In this modification, the control device 150 drives the downstream pressure pump 90 so that the downstream pump rotational speed reaches the maximum rotational speed when the upstream pump rotational speed reaches a predetermined rotational speed. Then, when the downstream pump rotation speed reaches the maximum rotation speed, the control device 150 drives the upstream pressure pump 88 so that the upstream pump rotation speed reaches the maximum rotation speed.

(Fourth Modification) The "gas introduction section" is not limited to the air introduction path 100 and the air control valve 102, but may also be the air introduction path 100 and an air pump connected to the air introduction path 100. good.

(Fifth Modification) In the above embodiment, air is introduced into the tank 52. In a modification, a gas such as carbon dioxide, hydrogen, or oxygen may be introduced into the tank 52 instead of air. In this case, a tank filled with gas may be disposed at the upstream end of the air introduction path 100.

The technical elements described in this specification or the drawings exhibit technical utility alone or in various combinations, and are not limited to the combinations described in the claims as filed. Furthermore, the techniques illustrated in this specification or the drawings can achieve multiple objectives simultaneously, and achieving one of the objectives has technical utility in itself.

2: Bath system 10: Heat source unit 12: Heat source unit 20: Supply water channel 22: First return water channel 24: First outgoing water channel 26: Hot water filling valve 30: Circulation pump 32: Water flow switch 50: Fine bubble generation unit 52: Tank 52a: Low water level electrode 52b: High water level electrode 60: Second return waterway 62: Third return waterway 64: Spout waterway 66: Communication waterway 68: Second outgoing waterway 70: Third outgoing waterway 74: Water supply waterway 80: No. 1 switching valve 82 : 2nd switching valve 84 : Check valve 86 : Water supply control valve 88 : Upstream pressure pump 90 : Downstream pressure pump 100 : Air introduction path 102 : Air control valve 130 : Bathtub 132 : Circulation connection Tool 150: Control device 152: Memory 170: Casing 170a: Suction port 170b: Discharge port 172: Vane portion 174: Shaft 174a: Front end portion 174b: Rear end portion 176: Rotor 178: Coil 180: First bearing 182: Second Bearing 200: Water supply source

Claims (2)

A bath device,
A circulation path that circulates water in the bathtub,
a tank provided in the circulation path and dissolving gas in water;
a first pump provided upstream of the tank in the circulation path;
a second pump provided upstream of the first pump in the circulation path;
a gas introduction part connected to the tank and capable of introducing gas into the tank;
a fine bubble discharge nozzle attached to the bathtub;
comprising a control device;
The control device includes:
a gas introduction operation of introducing gas from the gas introduction part into the tank in a stopped state where the first pump and the second pump are stopped;
After the gas introduction operation is completed, the first pump and the second pump are switched from the stopped state to a driving state in which the first pump and the second pump are driven, and the water from the tank is drained. , a water supply operation in which water is ejected into the bathtub via the fine bubble discharge nozzle;
It is configured to be able to perform fine bubble supply operation,
In the water supply operation, when switching the first pump and the second pump from the stopped state to the driving state, after starting the driving of the first pump, starting the driving of the second pump. It is configured,
The control device includes:
In the water supply operation, when the driving rotation speed of the first pump reaches a first predetermined rotation speed that is smaller than the first maximum rotation speed that is the maximum rotation speed of the first pump, driving the second pump. start the
Before the driving rotational speed of the first pump reaches the first maximum rotational speed, the driving rotational speed of the second pump reaches a second maximum rotational speed that is the maximum rotational speed of the second pump. driving the second pump;
driving the first pump so that when the driving rotational speed of the second pump reaches the second maximum rotational speed, the driving rotational speed of the first pump becomes the first maximum rotational speed;
Bath equipment. A bath device,
A circulation path that circulates water in the bathtub,
a tank provided in the circulation path and dissolving gas in water;
a first pump provided upstream of the tank in the circulation path;
a second pump provided upstream of the first pump in the circulation path;
a gas introduction part connected to the tank and capable of introducing gas into the tank;
a fine bubble discharge nozzle attached to the bathtub;
comprising a control device;
The control device includes:
a gas introduction operation of introducing gas from the gas introduction part into the tank in a stopped state where the first pump and the second pump are stopped;
After the gas introduction operation is completed, the first pump and the second pump are switched from the stopped state to a driving state in which the first pump and the second pump are driven, and the water from the tank is drained. , a water supply operation in which water is ejected into the bathtub via the fine bubble discharge nozzle;
It is configured to be able to perform fine bubble supply operation,
In the water supply operation, when switching the first pump and the second pump from the stopped state to the driving state, after starting the driving of the first pump, starting the driving of the second pump. It is configured,
The control device includes:
In the water supply operation, when the driving rotation speed of the first pump reaches a first predetermined rotation speed that is smaller than the first maximum rotation speed that is the maximum rotation speed of the first pump, driving the second pump. start the
When the driving rotational speed of the second pump reaches a second predetermined rotational speed that is smaller than the second maximum rotational speed that is the maximum rotational speed of the second pump, the driving rotational speed of the first pump reaches the first rotational speed. driving the first pump to reach a maximum rotational speed;
driving the second pump so that when the driving rotation speed of the first pump reaches the first maximum rotation speed, the driving rotation speed of the second pump becomes the second maximum rotation speed;
Bath equipment.

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