Shower apparatus, bathroom unit, computer program, and method of control

Abstract

To provide a technology that can adjust temperature change in fluid.SOLUTION: A shower apparatus may include: a shower body; a discharge part fitted to the shower body and discharging a fluid in a particle shape; and a particle-size control unit for changing a particle size of the fluid that is discharged from the discharge part in a first period.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The technology disclosed in this specification relates to a shower device and a bathroom unit. [Background technology]

[0002] Patent Document 1 discloses a hot water dispenser that can be switched from shower mode to mist mode. The hot water dispenser has a function that automatically raises the water temperature above the water temperature during shower operation and sprays high-temperature mist to promote sweating when the mode is switched from shower mode to mist mode. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-34360 Summary of the Invention [Problem to be solved by the invention]

[0004] The temperature of the granular fluid ejected from the shower is likely to change depending on the surrounding environment before it comes into contact with the user.

[0005] The present specification provides a technique that can regulate temperature changes in a fluid. [Means for solving the problem]

[0006] The technology disclosed in this specification relates to a shower apparatus. The shower apparatus may include a shower body, a discharge unit attached to the shower body that discharges granular fluid, and a particle size control unit that changes the particle size of the fluid discharged from the discharge unit during a first period.

[0007] Another technique disclosed in this specification relates to a bathroom unit. The bathroom unit may include a bathroom and the shower device described above.

[0008] The computer program and control method for the above shower apparatus are also novel and useful. [Brief explanation of the drawings]

[0009] [Figure 1] An oblique view of a bathroom unit of an embodiment is shown. [Figure 2] 1 shows a plan view of an overhead shower according to an embodiment. [Figure 3] FIG. 2 shows a configuration block diagram of a control device according to an embodiment. [Figure 4] 4 is an enlarged cross-sectional view taken along line IV-IV of FIG. 2. [Figure 5] FIG. 2 is a perspective view of a pin member according to an embodiment. [Figure 6] 10 shows a flowchart of a shower control process according to an embodiment. [Figure 7] 4 shows a graph illustrating a change in particle size of water droplets in the first embodiment. [Figure 8] 10 shows a graph illustrating the change in particle size of water droplets according to a modified example. [Figure 9] 10 is a graph showing a change in particle size of water droplets according to the second embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0010] (Bathroom unit configuration) As shown in Figure 1, bathroom unit 1 is defined by wall surface 4, floor surface 5, and ceiling surface 6 that surround bathroom 2. In addition to wall surface 4, floor surface 5, and ceiling surface 6, bathroom unit 1 also includes a bathtub 8, a shower device 10, and a seat portion 12.

[0011] Bathtub 8 stores water for the user to bathe in. In this specification, the water is referred to as "water" regardless of its temperature. Bathtub 8 stores water supplied from a water inlet (not shown). Bathtub 8 is located at one end of bathroom 2. Next to bathtub 8 is a space for using shower device 10. Next to bathtub 8 is seat 12 on which the user sits when using shower device 10. The top surface of seat 12 has a generally flat shape to make it easy for the user to sit.

[0012] A shower unit 10 is disposed on the opposite side of the seat unit 12 from the bathtub 8. The shower unit 10 is disposed along a wall surface 4 located on the opposite side from the bathtub 8. The shower unit 10 includes a hand shower unit 20, an overhead shower unit 30, a control unit 50 (see FIG. 3), and an operation unit 100.

[0013] Hand shower unit 20 comprises shower head 22, hose 24, and head holding member 26. Shower head 22 is connected to a water supply source such as a water heater via hose 24. Shower head 22 discharges water supplied via hose 24 from multiple outlets. Shower head 22 is held by head holding member 26. Head holding member 26 is fixed to wall surface 4. Head holding member 26 holds shower head 22 in a manner that allows the user to remove it. The user can use shower head 22 while it is held by head holding member 26. The user can remove shower head 22 from head holding member 26 and use it while holding it in their hand.

[0014] As shown in Figures 2, 4, and 5, the overhead shower unit 30 includes a water discharge unit 32 and an adjustment unit 34. The water discharge unit 32 is attached to the ceiling surface 6. As shown in Figure 2, the water discharge unit 32 has a rectangular shape with rounded corners. Multiple types of outlets 54, 56, 58 are arranged on the underside of the water discharge unit 32. The multiple outlets 54 are arranged at intervals in the water discharge unit 32. The multiple outlets 54 discharge water in shower form. Specifically, in shower form, water droplets with a particle size of approximately 0.5 mm to 3.0 mm are continuously discharged from each outlet 54.

[0015] The water discharger 32 has a plurality of outlets 56 arranged at intervals from one another. For example, four outlets 56 are arranged, each located at the vertices of a square. The diameter of the outlets 56 is smaller than the diameter of the outlet 54. The plurality of outlets 56 discharge water in a mist state. Specifically, in the mist state, water droplets having a particle size of approximately 100 μm to 350 μm are sprayed in a mist form from each outlet 56.

[0016] One outlet 58 is arranged in the center of the water discharger 32. The hole diameter of outlet 58 is larger than the hole diameters of outlets 54 and 56. Outlet 58 discharges water in a cascading state. Specifically, in the cascading state, water is continuously discharged from outlet 58 in a waterfall-like manner.

[0017] (Configuration of adjustment unit) FIG. 4 shows a cross-sectional view of a cross section passing through the center of one outlet 56. Adjustment unit 34 includes flow paths 56a and 56c, mist pin 56b, and actuator 60 (see FIG. 3). Flow path 56a is a hollow space disposed in water discharger 32. Water supplied from a water supply source flows through flow path 56a via piping (not shown). Water flowing into flow path 56a flows from flow path 56c to outlet 56. Water flowing from flow path 56a to flow path 56c passes through mist pin 56b. As shown in FIG. 5, mist pin 56b has a cylindrical shape. Groove 56d is formed on the surface of mist pin 56b. Groove 56d extends vertically to connect flow paths 56a and 56c. The lower end of groove 56d is inclined relative to the vertical direction. Water flowing through groove 56d flows into flow path 56c at an angle relative to the vertical direction.

[0018] In flow path 56c, a swirling flow is generated by the water flowing from groove 56d into flow path 56c. The swirling flow increases the flow velocity of the water flowing through flow path 56c. As a result, the water discharged from outlet 56 is sprayed in the form of a mist. Actuator 60 rotates mist pin 56b around the central axis of its cylindrical shape. Actuator 60 includes a motor, such as a stepping motor. This changes the opening area of ​​groove 56d that opens into flow path 56a. Changing the opening area of ​​groove 56d changes the flow velocity of the water flowing from flow path 56a to flow path 56c. Specifically, the smaller the opening area of ​​groove 56d, the faster the flow velocity of the water flowing into flow path 56c. The faster the water flow velocity, the smaller the particle size of the water discharged from outlet 56.

[0019] (Configuration of control unit) The actuator 60 is controlled by a control unit 50. As shown in FIG. 3, the control unit 50 is connected to each of the actuator 60, the switching valve device 70, and the operation unit 100 via wires so that they can communicate with each other. The control unit 50 includes a CPU and a memory. The CPU executes processing according to a computer program pre-stored in the memory. The memory includes volatile and non-volatile storage devices. In a modified example, the operation unit 100 may be able to communicate with the control unit 50 wirelessly.

[0020] The control unit 50 supplies an electrical signal that drives the actuator 60 in accordance with a computer program. The control unit 50 receives a signal from the operation unit 100. The operation unit 100 has a plurality of buttons that can be operated by a user. The control unit 50 is connected to the switching valve device 70. By operating the buttons on the operation unit 100, the user can select whether water will be discharged from the hand shower unit 20 or the overhead shower unit 30. Furthermore, when the user selects the overhead shower unit 30, the operation unit 100 can select whether water will be discharged in shower mode, mist mode, or cascading mode. The control unit 50 receives a signal from the button operated by the user.

[0021] Switching valve device 70 is disposed between the supply source and hand shower unit 20, and between the supply source and overhead shower unit 30. Switching valve device 70 includes multiple solenoid valves controlled by control unit 50. When operation unit 100 selects water discharge from hand shower unit 20, control unit 50 supplies power to each of the multiple solenoid valves of switching valve device 70 to connect the supply source to hand shower unit 20 and to cut off the connection between the supply source and overhead shower unit 30. When operation unit 100 selects the shower state of overhead shower unit 30, switching valve device 70 cuts off the connection between the supply source and hand shower unit 20, cuts off the connection between the supply source and outlets 56 and 58, and supplies power to connect the supply source to outlet 54. When the mist mode of the overhead shower unit 30 is selected by operation unit 100, switching valve device 70 cuts off the connection between the supply source and hand shower unit 20, cuts off the connection between the supply source and outlets 54, 58, and supplies power to connect the supply source to outlet 56. When the cascading water mode of the overhead shower unit 30 is selected by operation unit 100, switching valve device 70 cuts off the connection between the supply source and hand shower unit 20, cuts off the connection between the supply source and outlets 54, 56, and supplies power to connect the supply source to outlet 58.

[0022] (Water discharge process performed by the control unit) As shown in FIG. 6, controller 50 executes the water discharge process. This process is executed continuously while shower apparatus 10 is powered on. In S12, controller 50 waits for a signal to be received from operation unit 100. If a signal is received from operation unit 100 and the received signal indicates the mist mode (YES in S12), the process proceeds to S14. If a signal is received from operation unit 100 and the received signal indicates a mode other than the mist mode, i.e., the shower mode, the waterfall mode, or water discharge from hand shower unit 20 (NO in S12), the process proceeds to S24. In S14, controller 50 executes the gradual change process. Specifically, controller 50 controls switching valve device 70 to disconnect the supply source from hand shower unit 20, disconnect the supply source from outlets 54 and 58, and supply power to connect the supply source to outlet 56. This activates the solenoid valve disposed in the switching valve device 70, and water is supplied from the supply source to the flow path 56a. The control unit 50 supplies power to the actuator 60 to rotate the mist pin 56b, gradually reducing the opening area of ​​the groove 56d that opens into the flow path 56a. The control unit 50 continuously rotates the mist pin 56b for a predetermined gradual change period. This gradually reduces the flow rate of water flowing from the flow path 56a to the flow path 56c. As a result, the droplet size of the water discharged from the outlet 56 gradually decreases. During the gradual change period, the droplet size of the water discharged instantaneously is non-uniform. During the gradual change period, the range of variation in the droplet size of the water changes over time.

[0023] The control unit 50 rotates the mist pins 56b until a predetermined gradual change period has elapsed. As a result, the water droplet size changes continuously during the gradual change period. Once the gradual change period has elapsed, the control unit 50 stops the gradual change process in S16. That is, the control unit 50 stops the actuator 60 and stops the rotation of the mist pins 56b. As a result, the water droplet size in the mist state is maintained constant. During the maintenance period in which the water droplet size is maintained constant, water droplets with a particle size of approximately 150 μm to 350 μm are ejected. In the maintenance state, water droplets with a particle size of approximately 150 μm to 350 μm are ejected unevenly from one outlet 56. The maintenance state is a state in which the variation in the droplet size of the water ejected from the outlet 56 is within a predetermined range. The maintenance state is a state in which no processing or operation is being performed that intentionally changes the water droplet size, such as by rotating the mist pins 56b.

[0024] FIG. 7 shows the change over time in the particle size of water discharged from the outlet 56 during the gradual change period and the maintenance period. The vertical axis represents the particle size of water discharged from the outlet 56. The horizontal axis represents the period. As mentioned above, the instantaneous particle size is not uniform but varies. The graph in FIG. 7 shows the median of the range of variation in instantaneous particle size. During the gradual change period, the particle size changes linearly over the period. During the maintenance period after the gradual change period, the particle size remains constant. Note that the actual particle size varies depending on the pressure of the water flowing through the outlet 56 and the surrounding environment. For this reason, as shown in FIG. 7, the change in particle size is not necessarily linear. The actual change in particle size may be nonlinear. The control unit 50 controls the particle size to be reduced.

[0025] In a modified example, the particle size may be changed stepwise during the gradual change period, as shown in Figure 8. The particle size may be changed continuously and non-linearly during the gradual change period.

[0026] In S18, the control unit 50 determines whether or not a signal has been acquired from the operation unit 100, similar to S12. If a signal has been acquired from the operation unit 100, and the acquired signal indicates a state other than mist, i.e., if a signal for changing the water discharge state has been acquired (YES in S18), the process proceeds to S24. If a signal has been acquired from the operation unit 100, and the acquired signal indicates that water discharge has stopped (NO in S18, YES in S20), the process proceeds to S32. If a signal has not been acquired from the operation unit 100 (NO in S18 and S20), the process returns to S18.

[0027] In S24, control unit 50 executes a water discharge process other than the mist state. Specifically, if the acquired instruction indicates the shower state, control unit 50 controls switching valve device 70 to shut off the supply source from hand shower unit 20, shut off the supply source from outlets 56 and 58, and supply power so that the supply source communicates with outlet 54. This causes the solenoid valve arranged in switching valve device 70 to operate, and water is supplied from the supply source to outlet 54. If the acquired instruction indicates the cascading water state, control unit 50 controls switching valve device 70 to shut off the supply source from hand shower unit 20, shut off the supply source from outlets 54 and 56, and supply power so that the supply source communicates with outlet 58. This causes the solenoid valve arranged in switching valve device 70 to operate, and water is supplied from the supply source to outlet 58. If the acquired instruction indicates hand shower unit 20, control unit 50 supplies power to switching valve device 70 to connect the supply source to hand shower unit 20 and to cut off the supply source from outlets 54, 56, and 58. This activates the solenoid valve disposed in switching valve device 70, supplying water from the supply source to shower head 22.

[0028] In S26, the control unit 50 determines whether or not a signal has been acquired from the operation unit 100, as in S18. If a signal has been acquired from the operation unit 100, and the acquired signal is a signal indicating that water discharge has stopped (YES in S26, NO in S28), the process returns to S24. If the acquired signal is a signal indicating that water discharge has stopped (NO in S26, YES in S30), the process proceeds to S32. If a signal has not been acquired from the operation unit 100 (NO in S26 and S30), the control unit 50 determines in S26 whether or not a signal has been acquired.

[0029] If the acquired signal is a signal indicating the mist state (YES in S26 and S28), the process proceeds to S14. In this case, the control unit 50 controls the switching valve device 70 to supply water to the outlet 56 during the gradual change period and gradually reduce the flow rate in the state before switching, i.e., the shower state, the waterfall state, or the state of the hand shower unit 20.

[0030] In S32, control unit 50 controls switching valve device 70 to stop water discharge from shower device 10.

[0031] (effect) When discharging water in mist state, shower device 10 gradually reduces the size of the water droplets during a gradual change period immediately after water discharge begins. In mist state, the water droplets are small. The smaller the water droplets, the greater the surface area relative to the water's volume. As a result, the smaller the water droplets, the more susceptible they are to the influence of the ambient temperature after being discharged from outlet 56. If the water temperature is higher than the ambient temperature, the smaller the water droplets, the more likely the water is to cool before the water droplets discharged from outlet 56 hit the user. By discharging relatively large water droplets at the beginning of water discharge, the cooling of the water can be suppressed. This reduces the initial discomfort felt by the user in the mist state. By gradually reducing the water droplets, the water droplets can be more easily dispersed throughout bathroom 2.

[0032] When changing from a non-mist state to a mist state, the control unit 50 gradually reduces the water particle size during the gradual change period. This reduces the discomfort felt by the user due to the decrease in water temperature in the mist state, even if the water temperature is not changed when changing from a non-mist state to the mist state. In particular, during the gradual change period, water is discharged from both the mist state and the non-mist state, and therefore the flow rate of water supplied to the outlet 56 is low. By increasing the particle size, it is possible to prevent the user's perceived temperature from dropping.

[0033] During the gradual change period, after the user has gradually warmed up, by maintaining the particle size small, it is possible to achieve a mist state while minimizing discomfort to the user.

[0034] During the gradual change period, the particle size is continuously reduced, which prevents the user from feeling uncomfortable due to the change in particle size. By continuously reducing the particle size, the temperature of the water droplets that hit the user can be continuously changed. This prevents the occurrence of sudden temperature changes in the water droplets.

[0035] The control unit 50 does not execute a process to change the temperature of the water supplied to the outlet 56. The control unit 50 does not control the switching valve device 70 to change the temperature of the water. This simplifies the control of the control unit 50.

[0036] In bathroom unit 1, overhead shower unit 30 is located at the end opposite bathtub 8. This reduces the amount of water entering bathtub 8 when it splashes onto the user after being ejected from overhead shower unit 30.

[0037] Water droplets of different sizes are discharged from the same discharge port 56. This eliminates the need to arrange multiple types of discharge ports to accommodate different particle sizes. As a result, it is not necessary to arrange multiple pipes that communicate with the discharge ports. This simplifies the structure.

[0038] (Second embodiment) In the second embodiment, as shown in FIG. 9 , during the gradual change period, the control unit 50 operates the mist pin 56b to gradually increase the droplet size of the misted water. That is, the control unit 50 rotates the mist pin 56b so that the opening area of ​​the groove 56d relative to the flow path 56a gradually increases. The control unit 50 supplies power to the actuator 60 to rotate the mist pin 56b, gradually increasing the opening area of ​​the groove 56d that opens to the flow path 56a. The control unit 50 continuously rotates the mist pin 56b during the predetermined gradual change period. This gradually increases the flow rate of water flowing from flow path 56a to flow path 56c. As a result, the droplet size of the water ejected from the outlet 56 gradually increases. During the gradual change period, the droplet size of the water ejected instantaneously is non-uniform. During the gradual change period, the range of variation in the droplet size of the water changes over time.

[0039] Aspects of the technology disclosed in this specification are listed below.

[0040] A first aspect relates to a shower apparatus. The shower apparatus may include a shower body, a discharge unit attached to the shower body that discharges granular fluid, and a particle size control unit that changes the particle size of the fluid discharged from the discharge unit during a first period.

[0041] In a second aspect, in the first aspect, the particle size control unit may reduce the particle size of the fluid over time during the first period.

[0042] In a third aspect, in any one of the first and second aspects, the particle size control unit may change the particle size of the fluid at a constant temperature during the first period.

[0043] In a fourth aspect, in any one of the first to third aspects, the particle size control unit may change the particle size of the fluid during the first period and maintain the particle size of the fluid constant during a second period after the first period has elapsed.

[0044] A fifth aspect is the above-mentioned fourth aspect, wherein the particle size of the fluid in the second period may be 100 to 350 μm.

[0045] A sixth aspect may be any one of the first and fifth aspects, further comprising a switching unit that selectively switches the state of the fluid discharged from the discharge unit to one of a plurality of states including a first state and a second state different from the first state.

[0046] In a seventh aspect, in the sixth aspect, the switching unit may decrease the fluid in the first state over time and increase the fluid in the second state over time during a gradual change period between switching from the first state to the second state.

[0047] In an eighth aspect, in the seventh aspect, the first period may overlap with the gradual change period.

[0048] In a ninth aspect, in the first aspect, the particle size control unit may increase the particle size of the fluid over the first period.

[0049] A tenth aspect is the shower apparatus of any one of claims 1 to 2, wherein in any one of the first to ninth aspects, the particle size control unit changes the particle size of the fluid during the first period starting from the start of discharge.

[0050] An eleventh aspect relates to a bathroom unit. The bathroom unit may include a bathroom and the shower device according to any one of the first to ninth aspects.

[0051] A twelfth aspect relates to a computer program for a shower apparatus. The computer program may cause a computer installed in a shower apparatus including a shower body and a discharge unit attached to the shower body that discharges granular fluid to function as a particle size control unit that changes the particle size of the fluid discharged from the discharge unit during a first period.

[0052] A thirteenth aspect relates to a control method for a shower apparatus including a shower body and a discharge unit attached to the shower body that discharges granular fluid, and the control method may vary the particle size of the fluid discharged from the discharge unit during a first period.

[0053] Specific examples of the technology disclosed in this specification have been described in detail above. These are merely examples and do not limit the scope of the claims. The technology described in the claims includes various modifications and variations of the specific examples exemplified above. Modifications of the above embodiments are listed below.

[0054] (1) In shower device 10, the gradual change process is performed in the mist state. However, control unit 50 may change the particle size of the water droplets in shower unit 20 and hand shower unit 20 in addition to the mist state. Control unit 50 may change the particle size of the water droplets in shower unit 20 and hand shower unit 20 instead of the mist state.

[0055] (2) During the gradual change period, the control unit 50 changes the particle size of the mist water and switches from a state other than the mist state to the mist state. In this embodiment, the "first period" and the "gradual change period" are the same. In a modified example, the "first period" and the "gradual change period" may be different. For example, the control unit 50 may change the particle size of the mist water during the gradual change period after switching from a state other than the mist state to the mist state. That is, the "first period" and the "gradual change period" do not have to overlap. For example, the control unit 50 may start changing the particle size of the mist water while switching from a state other than the mist state to the mist state. That is, the "first period" and the "gradual change period" may partially overlap. For example, the control unit 50 may stop changing the particle size of the mist water while switching from a state other than the mist state to the mist state. For example, the control unit 50 may stop changing the particle size of the mist water after switching from a state other than the mist state to the mist state.

[0056] (3) The control unit 50 may change the particle size of the water droplets during the maintenance period.

[0057] (4) Bathroom unit 1 does not have to be equipped with seat portion 12. The user may use shower device 10 while standing or while sitting on a chair that is provided separately from bathroom unit 1.

[0058] (5) During the gradual change period, the control unit 50 may execute a process to change the temperature of the water supplied to the outlet 56. The control unit 50 may execute a process to change the temperature of the water without any operation from the user. For example, the temperature may be set high at the start of water discharge and then gradually decreased.

[0059] (6) In the above embodiment, the control unit 50 changes the particle size of the mist-state water from the start of discharge. However, the control unit 50 may not change the particle size of the water for a predetermined period after the start of water discharge, and may change the particle size of the water during a first period after the predetermined period has elapsed. The lengths of the predetermined period and the first period may be changed depending on the ambient temperature, time of day, season, etc. The start timing of the first period may be determined based on the start of discharge.

[0060] (7) Shower device 10 may discharge a fluid other than water. In this case, the water discharge process may be called a fluid discharge process.

[0061] The technical elements described in at least one of the specification and drawings exhibit technical utility alone or in various combinations, and are not limited to the combinations described in the claims at the time of filing. The technologies exemplified in at least one of the specification and drawings can achieve multiple objectives simultaneously, and achieving one of those objectives is itself technically useful. [Explanation of symbols]

[0062] 1: bathroom unit, 2: bathroom, 4: wall, 5: floor, 6: ceiling, 8: bathtub, 10: shower device, 12: seat, 14: water inlet, 20: hand shower, 30: overhead shower, 34: adjustment unit, 50: control unit, 54, 56, 58: outlet, 60: actuator, 70: switching valve device

Claims

1. The shower body and a discharge part attached to the shower body and configured to discharge granular fluid; a particle size control unit that changes the particle size of the fluid discharged from the discharge unit during a first period.

2. The shower apparatus of claim 1 , wherein the particle size control unit reduces the particle size of the fluid over time during the first period.

3. The shower apparatus according to claim 1 , wherein the particle size control unit changes the particle size of the fluid having a constant temperature during the first period.

4. 3. The shower apparatus of claim 1, wherein the particle size control unit changes the particle size of the fluid during the first period and maintains the particle size of the fluid constant during a second period after the first period has elapsed.

5. 5. The shower apparatus of claim 4, wherein the particle size of the fluid in the second period is 100 to 350 μm.

6. 3. The shower apparatus according to claim 1, further comprising a switching unit that selectively switches the state of the fluid discharged from the discharge unit to one of a plurality of states including a first state and a second state different from the first state.

7. 7. The shower apparatus of claim 6, wherein the switching unit decreases the amount of fluid in the first state over time and increases the amount of fluid in the second state over time during a gradual change period between the first state and the second state.

8. The shower apparatus of claim 7 , wherein the first period overlaps with the gradual change period.

9. The shower apparatus of claim 1 , wherein the particle size control unit increases the particle size of the fluid over the first period.

10. The shower apparatus according to claim 1 , wherein the particle size control unit changes the particle size of the fluid during the first period that begins from the start of discharge.

11. The bathroom and A bathroom unit comprising the shower device according to any one of claims 1 to 2.

12. 1. A computer program for a shower apparatus, comprising: A computer installed in a shower device including a shower body and a discharge part attached to the shower body that discharges granular fluid, a computer program that causes the computer to function as a particle size control unit that changes the particle size of the fluid discharged from the discharge unit during a first period;

13. A control method for a shower apparatus including a shower body and a discharge unit attached to the shower body that discharges granular fluid, comprising: A control method comprising: changing a particle size of the fluid discharged from the discharge portion during a first period.

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