Mist device and mist system including the same

Abstract

To provide a mist device capable of improving comfort of a user in mist bathing.SOLUTION: A mist device 1 includes: a mist generation section 8 for generating warmed mist from heated water, or generating mist warmed by heating mist generated from water; and a mist supply section 10 for supplying mist generated by the mist generation section into a bathtub body forming a retention space with an opened upper part. Mist supplied from the mist supply section resides in the retention space 4. The mist device further includes a mist atmospheric temperature suppression section 82 for suppressing the rise of an atmospheric temperature of mist that resides in the retention space.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a mist generating device, and particularly to a mist generating device used in a mist system.

Background Art

[0002] Conventionally, as shown in Patent Document 1, a bathtub sauna device for taking a sauna bath is known. Such a bathtub sauna device includes a bathtub lid provided on the upper part of the bathtub body to form a sauna space using mist.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, in the bathtub sauna device as shown in Patent Document 1, since a bathtub lid is required to form a sauna space, the position of the user is restricted, resulting in a loss of comfort and a lack of convenience for the user.

[0005] In contrast, the inventors of the present invention have intensively studied whether a mist bath can be formed by retaining mist in a bathtub body with an open upper part. At this time, in order to realize warm bathing from the initial stage of the mist bath, it is necessary to quickly raise the ambient temperature of the mist in the bathtub body at the initial operation of the mist device. However, if the temperature of the mist is set relatively high to raise the ambient temperature of the mist, after a certain period of time, the ambient temperature of the mist becomes too high and the user feels hot, resulting in a problem that the comfort of the user during mist bathing decreases. On the other hand, if the temperature of the mist is simply set relatively low, it takes time to raise the ambient temperature of the mist in the bathtub body at the initial stage of the mist bath, the user feels cold, and the comfort of the user during mist bathing decreases.

[0006] Therefore, the present invention has been made to solve the above-described problems of the prior art, and an object thereof is to provide a mist device that can suppress the ambient temperature of the mist from rising too much and improve the comfort of the user during mist bathing.

Means for Solving the Problem

[0007] In order to solve the above-described problems, an embodiment of the present invention is a mist device used for a bathtub body, including a mist generation unit that generates heated mist from heated water or generates heated mist by heating mist generated from water, and a mist supply unit that supplies the mist generated by the mist generation unit into the bathtub body that forms a retention space with an open upper part, and is configured such that the mist supplied from the mist supply unit stays in the retention space, and the mist device further includes a mist ambient temperature suppression unit that suppresses an increase in the ambient temperature of the mist staying in the retention space. In one embodiment of the present invention configured as described above, the mist device includes a mist atmosphere temperature suppression unit that suppresses an increase in the ambient temperature of the mist staying in the retention space. Thereby, after raising the ambient temperature of the mist at the initial stage of the operation of the mist device, it is possible to suppress the ambient temperature of the mist from rising too much. Therefore, even if the ambient temperature of the mist is raised relatively early at the initial stage of the operation of the mist device, it is possible to suppress the ambient temperature of the mist from rising too much thereafter, and the comfort of the user during mist bathing can be improved.

[0008] In one embodiment of the present invention, preferably, the mist atmosphere temperature suppression unit is configured such that the mist outlet temperature after a predetermined time has elapsed is lower than the mist outlet temperature at the outlet of the mist supply unit at the start of the supply of the mist. In one embodiment of the present invention configured as described above, the mist atmosphere temperature suppression unit is configured such that the mist outlet temperature after a predetermined time has elapsed is lower than the mist outlet temperature at the outlet of the mist supply unit at the start of the supply of the mist. Thereby, immediately after the start of the supply of the mist, the mist outlet temperature is set relatively high to increase the ambient temperature of the mist, and after a predetermined time has elapsed, the mist outlet temperature is decreased, and it is possible to suppress the ambient temperature of the mist from rising too much.

[0009] In one embodiment of the present invention, preferably, the mist device includes a heater and a heater control unit that controls the heater, and the heater control unit has a mist atmosphere temperature suppression mode in which the heater is controlled such that the mist outlet temperature after a predetermined time has elapsed is lower than the mist outlet temperature at the outlet of the mist supply unit at the start of the supply of the mist. In one embodiment of the present invention configured as described above, the control unit includes a mist atmosphere temperature suppression mode in which the heater is controlled so that the mist outlet temperature after a predetermined time has elapsed is lower than the mist outlet temperature at the outlet of the mist supply unit at the start of the supply of mist. The heater and the control unit function as the mist atmosphere temperature suppression unit. Thereby, the heater and the control unit can set the mist outlet temperature relatively high immediately after the start of the supply of mist to increase the atmosphere temperature of the mist, and after a predetermined time has elapsed, the mist outlet temperature can be decreased so that the atmosphere temperature of the mist does not rise too much.

[0010] In one embodiment of the present invention, preferably, the mist atmosphere temperature suppression unit is configured such that the mist supply flow rate from the mist supply unit after a predetermined time has elapsed is less than the mist supply flow rate from the mist supply unit at the start of the supply of mist. In one embodiment of the present invention configured as described above, the mist atmosphere temperature suppression unit is configured such that the mist supply flow rate from the mist supply unit after a predetermined time has elapsed is less than the mist supply flow rate from the mist supply unit at the start of the supply of mist. Thereby, immediately after the start of the supply of mist, the supply flow rate of the mist is set relatively high to increase the density of the mist, thereby increasing the atmosphere temperature of the mist relatively early, and after a predetermined time has elapsed, the supply flow rate of the mist is set low to decrease the density of the mist, thereby decreasing the atmosphere temperature of the mist so that the atmosphere temperature of the mist does not rise too much.

[0011] In one embodiment of the present invention, preferably, the mist generation unit includes a water storage unit for storing water for generating mist and an ultrasonic vibrator for irradiating ultrasonic waves to the water in the water storage unit to generate mist. The mist device further includes a heater and a heater control unit for controlling the heater. The heater control unit includes a mist supply flow rate suppression mode in which the heater is controlled so that the mist supply flow rate after a predetermined time has elapsed is less than the mist supply flow rate from the mist supply unit at the start of the supply of mist. In one embodiment of the present invention configured as described above, the heater control unit includes a mist supply flow rate suppression mode in which the heater is controlled so that the mist supply flow rate after a predetermined time has elapsed is less than the mist supply flow rate from the mist supply unit at the start of mist supply. As a result, immediately after the start of mist supply, the mist supply flow rate is set relatively high to increase the mist density, thereby increasing the mist ambient temperature relatively early. After a predetermined time has elapsed, the water temperature in the water storage unit is set to a temperature lower than the water temperature at the start of mist supply, and the mist supply flow rate is set low to reduce the mist density, thereby reducing the mist ambient temperature and suppressing the mist ambient temperature from rising too much.

[0012] In the present invention, preferably, the mist generation unit further includes a water supply unit that supplies water at a temperature lower than the temperature of the water in the mist generation unit to the mist generation unit, and a water supply control unit that controls the water supply unit. The water supply control unit includes a mist supply flow rate suppression mode in which the water supply unit is controlled so that the mist supply flow rate after a predetermined time has elapsed is less than the mist supply flow rate from the mist supply unit at the start of mist supply. In one embodiment of the present invention configured as described above, the water supply control unit includes a mist supply flow rate suppression mode in which the water supply unit is controlled so that the mist supply flow rate after a predetermined time has elapsed is less than the mist supply flow rate from the mist supply unit at the start of mist supply. As a result, immediately after the start of mist supply, the mist supply flow rate is set relatively high to increase the mist density, thereby increasing the mist ambient temperature relatively early. After a predetermined time has elapsed, the water temperature in the water storage unit is set to a temperature lower than the water temperature at the start of mist supply, and the mist supply flow rate is set low to reduce the mist density, thereby reducing the mist ambient temperature and suppressing the mist ambient temperature from rising too much.

[0013] In the present invention, preferably, the water supply control unit controls the water supply unit to supply water to the mist generation unit even when mist is being generated in the mist generation unit. In one embodiment of the present invention configured as described above, the water supply control unit controls the water supply unit to supply water to the mist generation unit even when the mist generation unit is generating mist. As a result, water can be supplied to the mist generation unit while the mist generation unit is generating mist. Thereby, while supplying mist so as to maintain the staying state in the staying space, the rise in the temperature of the water in the mist generation unit can be suppressed, and the ambient temperature of the mist can be suppressed from rising too much.

[0014] In the present invention, preferably, a mist system includes the mist device according to one embodiment of the present invention and a bathtub main body that forms the staying space for receiving the mist supplied from the mist supply unit of the mist device.

Advantages of the Invention

[0015] According to the mist device of the present invention, the comfort of the user during mist bathing can be improved.

Brief Description of the Drawings

[0016]

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Embodiments for Carrying Out the Invention

[0017] Hereinafter, embodiments of the present invention disclosed in this specification will be described in detail with reference to the drawings. From the following description, many improvements and other embodiments of the present invention will be apparent to those skilled in the art. Therefore, the following description should be construed as illustrative only and is provided for the purpose of teaching those skilled in the art the best mode of carrying out the present invention. Without departing from the spirit of the present invention, the details of its structure and / or function can be substantially changed.

[0018] Hereinafter, a mist system equipped with a mist device according to an embodiment of the present invention will be described with reference to the accompanying drawings. FIG. 1 is a schematic perspective view of a mist system including a mist device according to an embodiment of the present invention, FIG. 2 is a schematic configuration diagram of a mist system including a mist device according to an embodiment of the present invention, and FIG. 3 is a schematic cross-sectional view of a mist system including a mist device according to an embodiment of the present invention cut along the long side direction of the bathtub body. As shown in FIGS. 1 and 2, a mist system 2 including a mist device 1 according to an embodiment of the present invention is provided in a bathroom 3. The mist system 2 functions as a water receiving device (water circulation device) having a water receiving portion for receiving the discharged water.

[0019] The mist device 1 is used for a bathtub body 6. The bathroom 3 is a box-shaped space, forming an indoor space 5 that is sealed to a certain extent because water is used inside. The water includes water having a temperature higher than the outside air temperature (normal temperature) and heated water (so-called hot water). The mist system 2 includes a bathtub body 6 that forms a retention space 4 for receiving the mist supplied from a mist supply portion (to be described later) of the mist device 1. A supply device 7 for supplying water is provided in the mist system 2. As will be described later, the mist system 2 is configured such that a warm water layer X (see FIG. 2) heated to a temperature higher than the room temperature and a mist retention layer C formed by the mist heated in the retention space 4 above the warm water layer are formed in the bathtub body 6. The bathroom 3 is not limited to a room in which only the bathtub body 6 is arranged, and may include a toilet, a handwashing device, a washbasin, or a combination thereof.

[0020] The bathtub main body 6 forms a retention space 4 that is open upward toward the indoor space 5 where the bathtub main body 6 of the mist system 2 is disposed. The bathtub main body 6 is a bathtub and is configured such that water can be stored in the inner retention space 4. The bathtub main body 6 is formed in a rectangular shape in top view, with a long-side portion 6d formed on the long-side of the rectangle and a short-side portion 6e formed on the short-side. The width of the bathtub in the short-side portion 6e is shorter than that in the long-side portion 6d. The short-side side wall 6f (see FIG. 3) of the bathtub main body 6 facing the mist supply unit 10 is formed such that the upper part is inclined outward. The bathtub main body 6 has a volume in the range of, for example, 200 L to 500 L. For example, the bathtub main body 6 has a volume of 300 L, the volume of the warm water layer X of the bathtub main body 6 is 130 L, and the volume of the retention space 4 is 170 L (e.g., 300 L when no water is stored).

[0021] The retention space 4 is a space formed in a substantially rectangular parallelepiped shape inside the bathtub body 6. As shown in FIG. 3, when the user A takes a bath, water B at 34° C. to 45° C. is stored in the lower side of the retention space 4 (a warm water layer X is formed), and the user A can take a bath while sitting. As will be described later, in FIG. 3, mist remains above the water B in the retention space 4 (a state in which a mist retention layer C is formed). The retention space 4 is formed up to the upper end portion 6a of the bathtub body 6, and the top surface side is open. The bathtub body 6 is configured such that mist remains in the retention space 4 as will be described later, with the lid covering the top surface of the retention space 4 omitted. Note that mist may remain in the retention space 4 without water B being stored therein. The shape of the bathtub body 6 is not limited to a box shape as in the embodiment, and any shape that can form a retention space may be used. For example, the bathtub body 6 may be formed in a circular or elliptical shape in a top view, and a bowl-shaped retention space may be formed inside. The bottom surface of the bathtub body 6 may be formed obliquely so that the user can assume a posture close to a lying or sitting posture, a step portion may or may not be formed on the bottom surface. The top edge portion of the wall portion of the bathtub body 6 does not necessarily need to be formed horizontally at a constant height and may be formed such that the height changes. For example, the top edge portion of the wall portion of the bathtub body 6 may be shaped to extend obliquely upward or downward, in a side view, in an arcuate shape that partially recesses downward, or in a concavo-convex shape that forms a substantially right angle. The mist system 2 is configured such that the mist supplied from the mist supply portion remains in the retention space 4.

[0022] The supply device 7 is a supply device that supplies water to the bathtub main body 6, the faucet device on the washroom side, and the like. The supply device 7 is, for example, a water heater, and can supply water that is supplied from a supply source such as a water supply and has not been heated, or heated water (so-called hot water). The supply device 7 is connected to a water inlet 6g formed in the bathtub main body 6 and is configured to be able to supply water into the bathtub main body 6 from the water inlet 6g. The supply device 7 is also connected to the mist device 1 via a water supply line 14 and can supply water to the mist device 1 as well. Note that the mist device 1 may be directly connected to a water supply source such as a water supply without passing through the supply device 7. Also, both the supply device 7 and the water supply source may be connected to the mist device 1. Water is supplied to the supply device 7 from a water supply source such as a water supply. The supply device 7 is electrically connected to a water supply control unit 25. The supply device 7 of the present embodiment has a function as a reheating device that takes in the water in the bathtub main body 6 from the water inlet 6g which is a water intake port, heats this water internally, and returns it to the bathtub main body 6. The reheating device reheats the water already stored in the bathtub main body 6. Note that the supply device 7 does not necessarily have a function as a reheating device. Although the supply device 7 supplies water into the bathtub main body 6 from the water inlet 6g, as a modification, the supply device 7 may be connected to a faucet device for supplying water to the bathtub main body provided in the bathtub main body 6, and supply water into the bathtub main body 6 from this faucet device. Note that the faucet device for supplying water to the bathtub main body 6 may be directly connected to the water supply source without passing through the supply device 7. Also, both the supply device 7 and the water supply source may be connected to the faucet device.

[0023] Next, with reference to FIGS. 1 to 5, the mist device according to one embodiment of the present invention described above will be described in more detail. The mist system 2 includes a mist device 1. As shown in FIG. 3, the mist device 1 includes a mist generation unit 8 that generates mist from stored water, a mist supply unit 10 that supplies the mist into the bathtub body 6, a bathroom air conditioner 80 that can send out warm air or cold air to adjust the room temperature in the bathroom 3 (see FIG. 1), a mist atmosphere temperature suppression unit 82 that suppresses the rise in the atmosphere temperature of the mist staying in the staying space 4, a heater 20, a heater control unit 21 that controls the heater 20, a mist device operation unit 28 that receives a user's operation input, and a mist device control unit 26 that controls the generation of mist in the mist generation unit 8 and the supply of mist by the mist supply unit 10. The mist device 1 has the mist generation unit 8 provided in a horizontally long box-shaped casing 9 (see FIG. 4), and the mist supply unit 10 connected to the mist generation unit 8 is formed to extend downward from the front side of the casing 9.

[0024] The mist generation unit 8 generates heated mist from heated water or generates heated mist by heating the mist generated from water. Therefore, the mist generation unit 8 generates mist that is heated more than the room temperature in the bathroom. Therefore, the heated mist includes those heated after mist generation. The mist generation unit 8 is attached to the wall W above the short side portion 6e on the short side of the bathtub body 6.

[0025] As shown in FIG. 5, the mist generation unit 8 includes a water storage unit 12 that stores water inside, a water supply path 14 that supplies water from a water supply source to the water storage unit 12, a drainage path 16 that drains water from the water storage unit 12 to a drain pipe, an ultrasonic vibrator 18 provided at the inner bottom of the water storage unit 12, a water temperature measuring device 22 that is a water temperature detection means provided inside the water storage unit 12, an indoor temperature measuring device 24 (see FIG. 3) that is an air temperature detection means provided outside the water storage unit 12, a float switch 29 that issues a water supply stop signal when the float rises on the shaft portion to the water supply specified water level due to the rise in the water level in the water storage unit 12, and an overflow pipe 31 that is configured such that when the water level in the water storage unit 12 exceeds the water supply specified water level Q1 and further rises and the water overflows above the height position of the upper end opening, the water is drained from the upper end opening to the drain pipe side.

[0026] The water storage part 12 is formed as a water storage space inside the mist generation part 8 having a rectangular parallelepiped shape. A water supply passage 14 is connected to the upper part of the water storage part 12, and a drain passage 16 is connected to the lower part of the water storage part 12. A mist supply part 10 is connected to a side wall near the center of the water storage part 12. A water supply passage solenoid valve 30 for opening and closing the water supply passage 14 is provided in the water supply passage 14. The water supply passage 14 is connected to the supply device 7. The water supply passage solenoid valve 30 has a function of supplying water at a temperature lower than the temperature of the water in the mist generation part 8 as a water supply part to the mist generation part 8. Note that the supply device 7 is configured to supply water at a temperature (for example, about 38°C) lower than the temperature of the water in the mist generation part 8 (for example, about 60°C) to the mist generation part 8. A drain passage solenoid valve 32 for opening and closing the drain passage 16 is provided in the drain passage 16. Further, a drain pump 33 for draining water from the water storage part 12 is provided in the drain passage 16. Further, the overflow pipe 31 is provided in the water supply side part 12a in the water storage part 12. The upper end of the overflow pipe 31 is located slightly above the water supply specified water level Q1 and is configured so that the water in the water storage part 12 does not overflow. A discharge valve 41 for discharging water leakage due to a failure or the like is provided at the lower part of the water storage part 12.

[0027] The ultrasonic vibrator 18 can oscillate ultrasonic waves in the water in the water storage part 12, vibrate the water on the liquid surface, separate the water from the water column generated on the liquid surface into fine particles, and generate mist (fog) with a predetermined particle size. The ultrasonic vibrator 18 is electrically connected to the mist device control unit 26, and can change the particle size of the generated mist by adjusting the oscillation output, frequency, etc. of the ultrasonic waves of the ultrasonic vibrator 18. The ultrasonic vibrator 18 is configured to generate mist with a Sauter mean diameter of 3.1 μm or more and 10 μm or less with a predetermined oscillation output. The ultrasonic vibrator 18 may be changed to other devices that generate mist with a predetermined particle size, such as a mist device using steam, a mist device using pressure spraying, a mist device using arc discharge, etc. Also, in the present embodiment, a plurality of ultrasonic vibrators 18 are provided side by side in the water storage part 12. The ultrasonic vibrator 18 is connected to an oscillator 19 (see FIG. 4) that drives the ultrasonic vibrator 18 in the casing of the mist device 1.

[0028] The heater 20 is provided at the bottom of the water inside the water storage part 12 in the mist generation part 8. The heater 20 is configured to heat the water in the water storage part 12. The heater 20 is not limited to being provided in the water storage part 12 in the mist generation part 8, and may be provided in the air in the water storage part 12 or in the mist supply part 10. Therefore, the heater 20 may be configured to heat the mist or air in the water storage part 12. For example, the heater 20 can heat the water supplied from the supply device 7 (for example, water heated to about 40 °C) to 60 °C or more.

[0029] The water temperature detector 22 detects the water temperature of the water in the water storage part 12. The mist device control part 26 is electrically connected to the water temperature detector 22, and the mist device control part 26 can recognize the water temperature of the water in the water storage part 12. The water temperature detector 22 is, for example, a thermistor. The room temperature detector 24 detects the temperature of the air outside the water storage part 12 in the indoor space 5 where the bathtub main body 6 is arranged. The mist device control part 26 is electrically connected to the room temperature detector 24, and the mist device control part 26 can recognize the temperature of the air in the indoor space 5. Note that, in the state before the start of the supply of mist (before the mist generation part 8 is driven), it is assumed that the temperature of the air in the indoor space 5 and the temperature of the air in the staying space 4 are approximately equal or relatively close. Therefore, the mist device control part 26 can estimate the temperature of the air in the staying space 4 from the temperature of the air in the indoor space 5 measured by the room temperature detector 24.

[0030] The float switch 29 has a float that can move up and down in conjunction with the water level. The float switch 29 can detect that the water level has reached the water supply regulation level Q1 at the upper end of the float. Also, the float switch 29 can detect that the water level has reached the lower end water level at the lower end of the float. Such detection of the water supply regulation level and the lower end water level may be performed by separate floats. The float switch 29 is electrically connected to the mist device control part 26.

[0031] The mist supply unit 10 supplies the mist generated by the mist generation unit 8 into the bathtub main body 6 which is a retention part forming a retention space 4 with an upward opening in the room where the bathtub main body 6 is arranged. The mist supply unit 10 is arranged above the short side portion 6e on the short side of the bathtub main body 6. The mist supply unit is arranged above the water overflow part in the bathtub main body. As shown by the cross-section of the flow path shown in Fig. 3, the mist supply unit 10 includes a mist supply flow path 11 extending horizontally from the mist generation unit 8 to the upper part of one end of the retention space 4, and a mist supply port part 13 connected to the downstream end of the mist supply flow path 11 and opening downward. The mist supply flow path 11 forms a horizontally long rectangular flow path (for example, the flow path cross-section) when viewed from the front (from the side of the retention space 4). The mist supply port part 13 extends downward from the downstream end of the mist supply flow path 11. The mist supply port part 13 forms a duct-shaped flow path extending downward. The mist supply port part 13 forms an opening opening downward. When viewed from the front of the opening (when viewed from below to above the mist supply port part 113), the mist supply port part 13 forms a horizontally long rectangular flow path (for example, the flow path cross-section). The lower end 13a of the mist supply port part 13 is arranged above the overflow surface 6b of the water in the bathtub main body 6. Therefore, it is possible to prevent the water in the bathtub main body 6 from entering the upstream side from the mist supply port part 13 as the flow of sewage. As a modification, the overflow surface 6b may be an overflow port provided in the bathtub main body 6.

[0032] The mist supply unit 10 can supply mist at a supply rate per unit time in the range of, for example, 0.03 mL / min·L to 1.5 mL / min·L. The mist supply unit 10 can supply mist at a supply rate of 11 mL / min per unit time to the retention space 4 with a volume of 330 L of the bathtub main body 6. Also, for example, the mist supply unit 10 can supply mist at a supply rate of 6 mL / min per unit time to the retention space 4 with a volume of 4.32 L of other water receiving devices or the like.

[0033] The mist device 1 of the mist system 2 supplies mist that forms a retention state into the retention space 4. The mist device 1 is configured such that the mist supplied from the mist supply unit 10 is retained in the retention space 4 of the bathtub main body 6. Further, the mist device 1 forms a rising cloud-like body R of mist having a density state close to the retention state (for example, an aggregate of mist with a predetermined density that rises further above the overflow surface 6b, which is the upper edge of the bathtub main body 6 as shown in FIG. 9) above the overflow portion of the bathtub main body while utilizing the force of the upward airflow directed upward from within the bathtub main body 6. After that, the supplied mist is configured to form a mist retention layer C in the retention space 4 of the bathtub main body 6. The retention layer C does not necessarily have to be a complete layer, and it is sufficient if the cloud-like body of mist exists at a certain height so as to form a layer. The mist device 1 supplies mist that can return to the retention state while rising to the extent of forming the rising cloud-like body of mist. Note that the mist device 1 may form the mist retention layer C without forming the rising cloud-like body R of mist.

[0034] The bathroom air conditioner 80 can send out warm air at a temperature higher than the temperature in the space where the bathtub main body 6 is provided, cold air at a temperature higher than the temperature in the space, and air at a temperature substantially the same as the temperature in the space. The bathroom air conditioner 80 is provided on the ceiling of the bathroom. The mist system 2 is configured to control the bathroom air conditioner 80 to adjust the temperature in the bathroom and to control the strength of the upward airflow directed upward from within the bathtub main body 6 according to the temperature difference between the temperature of the water stored in the bathtub main body 6 and the temperature in the bathroom where the bathtub main body 6 is used before the start of mist supply. Note that the mist device 1 may adjust the upward airflow by not operating the bathroom air conditioner 80 when the temperature in the bathroom is at an appropriate temperature. That is, the mist system 2 does not necessarily have to be equipped with the bathroom air conditioner 80.

[0035] The mist atmosphere temperature suppression unit 82 is configured such that the mist outlet temperature after a lapse of a predetermined time is lower than the mist outlet temperature at the mist supply port 13 which is the outlet of the mist supply unit 10 at the start of the supply of mist. The mist atmosphere temperature suppression unit 82 is configured such that the mist supply flow rate from the mist supply unit 10 after a lapse of a predetermined time is less than the mist supply flow rate from the mist supply unit 10 at the start of the supply of mist.

[0036] The water supply control unit 25 controls the supply of water to the bathtub main body 6 and the faucet device on the washroom side. The water supply control unit 25 incorporates a CPU, a memory, etc., and controls devices connected so as to execute water supply and predetermined modes described later based on a predetermined control program recorded in the memory, etc. The water supply control unit 25 is electrically connected to the supply device 7, the operation unit 27, the mist device control unit 26, the bathroom air conditioner 80, etc. These electrical connections may be made by wireless communication or the like. The electrical connection between the water supply control unit 25 and the mist device control unit 26 and / or the operation unit 27, etc. may be made by wireless communication or the like. For example, the water supply control unit 25 and the mist device control unit 26 and / or the operation unit 27, etc. may be controlled by wireless communication.

[0037] The water supply control unit 25 can operate to supply water to the bathtub main body 6 independently of the operation of the mist device 1. Note that the water supply control unit 25 can also operate in relation to the operation of the mist device 1 by cooperating with the mist device control unit 26. The water supply control unit 25 and the mist device control unit 26 communicate with each other and function as one control unit. Thus, although the water supply control unit 25 and the mist device control unit 26 are described as separate control units in the present embodiment, they may be a control unit integrated into one form, or may exist as a control unit in a different form such as being further subdivided.

[0038] The operation unit 27 includes a bathroom operation unit 27a provided on the wall surface around the bathtub main body 6 in the bathroom, and an outdoor bathroom operation unit 27b provided on the wall surface outside the bathroom. The outdoor bathroom operation unit 27b is provided, for example, in the kitchen, corridor, or the like. The operation unit 27 may be configured as an operation unit that can be remotely operated by wireless communication or the like. For example, the operation unit 27 may be configured by a user's smartphone or the like by using a predetermined program.

[0039] The mist device operation unit 28 transmits the user's operation input to the mist device control unit 26. The mist device operation unit 28 includes a bathroom operation unit 28a provided on the wall surface around the bathtub main body 6 in the bathroom, and an outdoor bathroom operation unit 28b provided on the wall surface outside the bathroom. The outdoor bathroom operation unit 28b is provided, for example, in the room in front of the bathroom, corridor, or the like. The mist device operation unit 28 may be configured as an operation unit that can be remotely operated by wireless communication or the like. For example, the mist device operation unit 28 may be configured by a user's smartphone or the like by using a predetermined program and connected to the mist device control unit 26 via the Internet. The mist device operation unit 28 can also perform operations such as water storage operation to the mist system 2 and water temperature setting when supplying mist. The mist device operation unit 28 may have an operation function for setting the temperature of the supplied mist, an operation function for setting the particle size of the supplied mist, and the like.

[0040] The mist device control unit 26 incorporates a CPU, memory, etc., and controls devices connected so as to execute mist generation, a predetermined mode described later, etc. based on a predetermined control program recorded in the memory, etc. The mist device control unit 26 is electrically connected to the ultrasonic vibrator 18, heater 20, water temperature measuring device 22, indoor temperature measuring device 24, mist device operation unit 28, bathroom air conditioner 80, etc. The mist device control unit 26 is further electrically connected to a water supply path solenoid valve 30 provided in the water supply path 14 and a drain path solenoid valve 32 provided in the drain path, and can control these.

[0041] The mist device control unit 26, as a control unit, has a function of controlling the mist generation unit. The mist device control unit 26 has a mist generation mode 26a for causing the mist generation unit 8 to generate mist. The mist device control unit 26 can be executed by a program stored in a storage device for the mist generation mode. The mist generation mode does not necessarily need to execute all of the operations of the mist generation unit 8 disclosed in the present embodiment, and it may be any mode that executes at least the operation of generating mist among the operations. The mist device control unit 26, as a heater control unit, has a function of controlling a heater. The mist device control unit 26, as a water supply control unit, has a function of controlling the water supply path solenoid valve 30 which is a water supply unit. The mist device control unit 26 controls the water supply path solenoid valve 30 to supply water to the mist generation unit 8 even when mist is being generated in the mist generation unit 8.

[0042] The mist device control unit 26 has a mist atmosphere temperature suppression mode in which the heater is controlled so that the mist outlet temperature after a predetermined time has elapsed is lower than the mist outlet temperature at the mist supply port 13, which is the outlet of the mist supply unit 10 at the start of mist supply. At this time, the heater 20 and the heater control unit 21 can function as the mist atmosphere temperature suppression unit 82. The mist device control unit 26 may have a mist supply flow rate suppression mode in which the heater 20 is controlled so that the mist supply flow rate after a predetermined time has elapsed is less than the mist supply flow rate from the mist supply unit 10 at the start of mist supply. The mist device control unit 26 may have a mist supply flow rate suppression mode in which the water supply path solenoid valve 30 is controlled so that the mist supply flow rate after a predetermined time has elapsed is less than the mist supply flow rate from the mist supply unit 10 at the start of mist supply. At this time, the water supply path solenoid valve 30 and the water supply control unit 25 can function as the mist atmosphere temperature suppression unit 82. Note that the mist device control unit 26 may be configured to include either one of the mist atmosphere temperature suppression mode and the mist supply flow rate suppression mode. Note that, as the mist supply flow rate suppression mode, the mist device control unit 26 may control the water supply path solenoid valve 30 so that the water level in the water storage unit 12 is changed from the water supply specified level Q1, which is efficient for mist generation, to another level at which the generation efficiency decreases, and the mist supply flow rate is decreased so that the mist supply flow rate after a predetermined time has elapsed is less than the mist supply flow rate from the mist supply unit 10 at the start of mist supply.

[0043] Next, with reference to FIGS. 3, 6 to 11, the operation of the mist device according to the above-described embodiment of the present invention will be described. As shown in FIG. 3, in the standby state before the operation of the mist device 1 starts, water at about 38° C. is stored in the lower half of the retention space 4 of the bathtub body 6. The temperature of the air in the indoor space 5 in the bathroom 3 and the temperature of the air in the retention space 4 are substantially equal. The water supply path solenoid valve 30 and the drainage path solenoid valve 32 are closed. There is no water in the water storage unit 12. The ultrasonic vibrator 18 and the heater 20 are stopped.

[0044] The user operates the mist device operation unit 28 to start the supply control of the mist of the mist device 1. Before the start of the mist supply, the room thermometer 24 measures the temperature of the air in the indoor space 5, and the mist device control unit 26 recognizes the temperature of the air in the indoor space 5. The mist device control unit 26 opens the water supply path solenoid valve 30 to supply water from the water supply path 14 into the water storage unit 12. The drain path solenoid valve 32 remains closed. When a predetermined amount of water is stored in the water storage unit 12, the water supply path solenoid valve 30 is closed. Next, the mist device control unit 26 activates the heater 20 to heat the water supplied with water from the water temperature to 60°C or higher. After the water is heated to 60°C or higher, the mist device control unit 26 adjusts the temperature of the mist so as to supply the mist at a predetermined temperature. Next, the mist device control unit 26 executes the mist generation mode to activate the ultrasonic vibrator 18 to generate mist in the water storage unit 12.

[0045] In FIG. 6, the state immediately after the start of the supply of mist from the mist supply unit 10 into the retention space 4 is shown. The mist generated in the water storage unit 12 is supplied from the mist supply unit 10 to the retention space 4 in the bathtub main body 6. The mist is supplied into the retention space 4 while freely falling due to its own weight from the mist supply unit 10 as shown by the arrow F1. In this way, it is suppressed that the mist has a moving speed in a direction other than the downward moving speed. Therefore, it is made difficult for the mist to move such as stirring, diffusion, and rising in the retention space 4.

[0046] In FIG. 7, a state after about several seconds have elapsed since the start of the supply of mist is shown. The supply of mist from the mist supply unit 10 to the retention space 4 is continuing. The supplied mist has started to stay in the upper part above the water surface of the water B and in the lower part within the retention space 4. The mist is likely to stay within the retention space 4 because the force attempting to lift the mist by the upward airflow does not exceed the weight of the mist supplied from the mist supply unit 10. Therefore, the mist stays in the relatively lower part within the retention space 4. The mist is gradually supplied and added from the side of the mist supply unit 10 and gradually advances from the side of the mist supply unit 10 toward the short side on the opposite side over the water surface or the bottom within the retention space 4.

[0047] In FIG. 8, a state in which the mist has reached the short side on the opposite side of the bathtub main body 6 from the state of FIG. 7 is shown. The supply of mist from the mist supply unit 10 to the retention space 4 is continuing.

[0048] As shown in Fig. 9, from the state of Fig. 8 where the mist reaches the short side on the opposite side of the bathtub body 6, a rising cloud-like body R of the mist is formed so as to rise above the overflow surface 6b of the bathtub body 6. The mist supplied from the mist supply unit 10 rises along the short side wall 6f on the short side portion 6e side opposite to the mist supply unit 10, and further rises beyond the overflow surface 6b which is the upper edge. An aggregate of mist (rising cloud-like body R) with a predetermined density is formed above the overflow surface 6b. In the rising cloud-like body R, the mist has a concentration of a certain level or more in the air. By arranging a laser device disposed outside the retention space 4 as described later and a transmittance measuring device that receives the laser at the location where the rising cloud-like body R is formed, the transmittance of the rising cloud-like body R is measured. The transmittance is preferably set to a value less than at least 90%, more preferably a value within the range of 80% to 5%. Further, when the transmittance of such a measured value persists for 1 second or more, it can be determined that a rising cloud-like body R with a predetermined density is formed. The rising cloud-like body R has a mist density relatively close to the density of the retention layer C. An aggregate of mist with a density of a certain level or more that has risen above the overflow surface 6b is defined as the rising cloud-like body R. The rising cloud-like body R is formed continuously with the mist retention layer C, and the rising cloud-like body R is formed so as to extend upward from the mist retention layer C (the portion where the mist is retained).

[0049] From the start point of mist supply, an upward airflow is formed from the inside of the bathtub body 6 upward due to the temperature difference between the temperature of the water stored in the bathtub body 6 and the temperature in the bathroom where the bathtub body 6 is used before the start of mist supply. Therefore, the mist is easily lifted by the upward airflow immediately after the start of supply, and the rising cloud-like body R formed by the mist rising continuously temporarily is easily formed upward from the overflow surface 6b.

[0050] As shown in Fig. 9, after the rising cloud-like body R rises to about 20 cm to about 30 cm above the overflow surface 6b, some of the mist floats and diffuses, and for most of the mist, gravity becomes greater than the upward airflow force, and it gradually descends again toward the retention space 4 in the bathtub body 6. Also, some of the mist vaporizes and disappears during the movement. The rising cloud-like body R that has risen above the overflow surface 6b has the effect of absorbing the surrounding heat by vaporization of some of the mist and cooling the surroundings. Therefore, if the user's face is in a position close to the short-side portion 6e side, the mist region can be raised near the user's face, and due to the latent heat of vaporization of some of the mist in the rising cloud-like body R, it has the effect of cooling the surroundings of the user's face. Therefore, it can give an effect of slightly cooling the user's face. On the other hand, even if a part of the mist temporarily rises above the overflow surface 6b, a flow in which the main stream of the mist continues to rise while diffusing from the bathtub body 6 is not formed. Even if it rises to a certain extent, a flow that descends toward the retention space 4 is formed, and the main stream of the mist stays in the retention space 4 (mainly in the region below the overflow surface 6b), forming a retention layer C in the retention space 4. During this time, the supply of mist from the mist supply unit 10 to the retention space 4 continues.

[0051] As shown in FIG. 10, when mist is further supplied into the retention space 4 from the state of FIG. 9, the mist descending from the rising cloud-like body R returns to the retention space 4 again and stays therein. As shown in FIG. 11, when more mist is supplied, the increased mist comes to stay up to a gradually higher portion in the retention space 4. The supply of mist from the mist supply unit 10 to the retention space 4 continues. The mist supplied into the retention space 4 further increases and stays up to a portion near the top (the upper end portion 6a of the bathtub body 6) in the retention space 4. The mist mainly stays in a region above the water surface of the water B and below the top in the retention space 4. The mist disappears by falling onto and being absorbed by the water B, or disappears by adhering to the wall surface of the bathtub body 6 as water droplets, or diffuses beyond the edge of the upper end portion 6a of the bathtub body 6. The time until disappearance varies depending on the particle size of the mist. Although the mist thus disappears or diffuses, a mist retention layer can be formed in the retention space 4 by supplying new mist before it disappears or diffuses. That is, the mist forms a stable retention layer C while gently flowing in the retention space 4 and not reaching the point of diffusing from the retention space 4. The retention layer C is formed by the presence of mist with a density of a certain level or more in a unit space above the water surface of the water B. The retention layer is recognized as a white cloud shape. The retention layer C is visually recognized as if the retention space 4 is filled with mist up to the top. The retention layer C is distinguished from the mist that diffuses from the retention space 4 and spreads throughout the indoor space.

[0052] The retention boundary surface 66 on the upper side of the retained mist is formed below the height position M1 obtained by adding the height corresponding to the depth L1 of the bathtub body 6 to the height (height position M0 (see FIG. 3)) of the overflow surface 6b of the bathtub body 6. The retention boundary surface 66 indicates the boundary region between the retention layer C in which the mist has a concentration of a certain level or more in the air and the air layer J in which the mist has a concentration of less than a certain level in the air. Since the mist moves to some extent while staying, the retention boundary surface 66 is defined as a region having a somewhat height in the vertical direction. Note that the overflow surface 6b, which is the overflow portion of the bathtub body 6, is the portion with the lowest height among the side walls of the bathtub body 6, that is, the portion where water first overflows when it accumulates up to the upper limit of the bathtub body 6.

[0053] For example, the retention boundary surface 66 on the upper side of the retained mist is formed above the height position M0 of the overflow surface 6b which is the overflow part of the bathtub body 6. At this time, for example, the retention boundary surface 66 on the upper side of the retained mist may be formed below the height position 200 mm above the height (height position M0) of the overflow surface 6b of the bathtub body 6, and also for example, it may be formed below the height position 100 mm above the height (height position M0) of the overflow surface 6b of the bathtub body 6. In this way, when the retention boundary surface 66 is at a position higher than the height of the overflow surface 6b of the bathtub body 6, the user can obtain the mist bathing effect up to a position beyond the bathtub, that is, the warm bath effect up to a height higher than the bathtub. While the mist generation unit 8 is being driven (used), mist is supplied into the bathtub body 6 and the retention of the mist continues. The mist device 1 is configured to define the temperature difference between the water temperature and the room temperature in the bathtub body 6, the particle size of the mist, the supply amount of the mist, etc., such that the height position of the retention boundary surface 66 becomes the predetermined height position as described above.

[0054] After the supplied mist forms the mist retention layer C in the retention space 4 of the bathtub body 6, a part of the mist in the retention space 4 rises above the water overflow part 6C of the bathtub body 6. For example, a part of the retention layer C rises so as to bulge and rises above the overflow part 6C. That is, in a relatively short time, a relatively small rising cloud-like body R that rises from the retention layer C above the overflow part 6C is formed. The determination of whether the rising cloud-like body R is formed can be determined by the transmittance in the same manner as described later. As a result, a part of the mist in the retention space after the retention layer C is formed is likely to rise above the overflow part 6c, the mist rises and vaporizes, and the heat of vaporization can cool the vicinity of the user's face, and the body can be warmed as a mist bath by the mist retention layer.

[0055] Also, as shown in FIG. 11, after the mist retention layer C is formed in the retention space 4 of the bathtub main body 6, by continuously supplying mist from the mist supply unit 10 to the bathtub main body 6, the mist that cannot fit into the retention space 4 overflows, and it becomes possible to supply the mist to the floor surface side adjacent to the bathtub main body 6. As a result, the mist can also vaporize from the floor surface in the bathroom, and the space in the bathroom can be cooled more efficiently by the heat of vaporization. Therefore, the face of the user coming out of the bathtub main body 6 can be cooled more, and the body can be warmed as a mist bath by the mist retention layer C. When the user finishes using the mist device 1, the user operates the mist device operation unit 28, and the execution of the mist generation mode of the mist device control unit 26 is terminated.

[0056] As shown in FIG. 11, the mist supplied by the mist device 1 of the mist system 2 can form a retention state in the retention space 4. This mechanism will be described. As a basic mechanism, the force that attempts to raise the mist by the updraft generated by the temperature difference ΔT between the water temperature in the bathtub body 6 and the room temperature in the bathroom does not exceed the weight of the mist supplied from the mist supply unit 10, so that the mist stays in the retention space 4. That is, when the weight of the mist is greater than the force attempting to raise the mist, the mist forms a retention state. Therefore, the mist device 1 of the mist system 2 can more easily form a retention state of the mist in the retention space 4 by supplying mist that satisfies such conditions. The updraft is generated by the temperature difference ΔT between the water temperature in the bathtub body 6 and the room temperature in the bathroom, but also by the temperature difference between the temperature of the mist (the ambient temperature of the mist) and the room temperature in the state where the mist retention layer is formed. In addition, the weight of the mist is affected by the particle size and density of the mist. When the supply amount of the mist increases, the density of the mist increases and / or the mist particles combine with each other to increase the particle size of the mist, etc., so that the weight of the aggregate of the mist becomes heavier. Therefore, when the supply amount of the mist increases, the mist is more likely to form a retention state. On the other hand, when the supply amount of the mist decreases, it becomes difficult for the mist to form a retention state. Also, when the particle size of the supplied mist increases, the mist is more likely to form a retention state. Further, in order to form a retention state of the mist in the retention space 4, the larger the retention space 4 is, the larger the supply amount of the mist required. When the retention space 4 is relatively small, the supply amount of the mist is at least less, and it becomes easier to fill the mist with a smaller supply amount, and the density of the mist is likely to increase. Therefore, a retention state of the mist can be formed in the retention space 4 with a smaller supply amount. Also, when the kinetic energy of the mist at the time of mist supply is large, the mist is likely to dissipate, so it becomes difficult for the mist to form a retention state. When the supply amount of the mist is relatively small, the mist is likely to vaporize, so it becomes difficult for the mist to form a retention state. Based on such findings, the inventors of the present invention obtained the following findings on the state in which the mist is likely to stay in the retention space 4.

[0057] Next, with reference to FIG. 12, a state in which the mist is likely to stay in the retention space 4 will be described. As shown in Fig. 12, with the supply flow rate of mist [ml / min] changed with respect to the temperature difference ΔT [°C] between the water temperature in the bathtub main body 6 and the room temperature in the bathroom, after the rising cloud-like mist is formed above the overflow part of the bathtub main body, whether the mist stays in the retention space 4, whether the mist stays in the retention space 4 without the rising cloud-like mist being formed above the overflow part of the bathtub main body, or whether the mist floats outside the retention space 4 and does not stay in the retention space 4 was evaluated. At this time, the height from the overflow surface 6b (upper rim part) at the lower end of the mist supply part 10 is 50 mm, and the Sauter mean particle diameter of the mist is 3.1 μm or more and 10 μm or less. When no water is stored in the bathtub main body 6, the water temperature in the bathtub main body 6 is evaluated as the temperature of the bathtub main body 6, that is, the room temperature.

[0058] In FIG. 12, with respect to the supply flow rate of mist [ml / min], the temperature difference ΔT [°C] between the water temperature in the bathtub body 6 and the room temperature in the bathroom is changed to determine whether the mist floats outside the retention space 4 and does not stay in the retention space 4, or whether the mist stays in the retention space 4 after the rising cloud-like mist is formed above the overflow part of the bathtub body. The temperature differences ΔT [°C] at the boundary points are found to be 0 [°C], 7.9 [°C], 11.5 [°C], 17.0 [°C], and 22.0 [°C]. The virtual boundary line P1 passing through these multiple temperatures indicates the boundary between the region where the mist floats outside the retention space 4 and does not stay in the retention space 4, and the region where the mist stays in the retention space 4 after the rising cloud-like mist is formed above the overflow part of the bathtub body. Similarly, with respect to whether the mist stays in the retention space 4 after the rising cloud-like mist is formed above the overflow part of the bathtub body 6, or whether the mist stays in the retention space 4 without the rising cloud-like mist being formed above the overflow part of the bathtub body, the temperature differences ΔT [°C] at the boundary points are found to be 0 [°C], 4.0 [°C], 4.3 [°C], 7.6 [°C], 8.2 [°C], and 7.5 [°C]. The virtual boundary line P2 passing through these multiple temperatures indicates the boundary between the region where the mist stays in the retention space 4 after the rising cloud-like mist is formed above the overflow part of the bathtub body, and the region where the mist stays in the retention space 4 without the rising cloud-like mist being formed above the overflow part of the bathtub body.

[0059] In FIG. 12, in the region N1 where the mist floats outside the retention space 4 and does not stay in the retention space 4, it is a region where the upward airflow generated from the difference between the water temperature and the room temperature is relatively strong. Inside the retention space 4, the weight (gravity) of the mist is smaller than the force exerted by the upward airflow on the mist. Therefore, the mist is floating and dissipating above the retention space 4 due to the upward airflow. In region N2 where the mist stays within the retention space 4 without the rising cloud-like mist being formed above the overflow portion of the bathtub main body, it is a region where the upward airflow generated from the difference between the water temperature and the room temperature is relatively weak. Since the weight (gravity) of the mist within the retention space 4 is greater than the force exerted by the upward airflow on the mist, the mist is less likely to be lifted by the upward airflow and stays in a state within the retention space 4 and below the overflow surface 6b. In region N3 where the mist stays within the retention space 4 after the rising cloud-like mist is formed above the overflow portion of the bathtub main body 6, it is a region where an upward airflow is generated to a certain extent from the difference between the water temperature and the room temperature. Although the weight (gravity) of the mist within the retention space 4 is greater than the force exerted by the upward airflow on the mist, the weight of the mist and the force exerted by the upward airflow are relatively close. Therefore, the mist is lifted by the upward airflow to a position above the overflow surface 6b once, forming a rising cloud-like mist. After that, the mist gradually descends towards the retention space 4, forming a state where the mist stays within the retention space 4 and below the overflow surface 6b.

[0060] As shown in FIG. 13, the height from the overflow surface 6b (upper rim portion) at the lower end of the mist supply unit 10 was changed to 110 mm, and the same measurement as in FIG. 12 was performed. That is, the height from the overflow surface 6b at the lower end of the mist supply unit 10 in FIG. 13 is higher than the height in FIG. 12. In FIG. 13, parameters other than the height at the lower end of the mist supply unit 10 are set in the same manner as in FIG. 12.

[0061] In FIG. 13, with respect to the supply flow rate of mist [ml / min], the temperature difference ΔT [°C] between the water temperature in the bathtub main body 6 and the room temperature in the bathroom is changed to determine whether the mist floats outside the retention space 4 and the mist does not stay in the retention space 4, or whether the mist stays in the retention space 4 after the rising cloud-like mist is formed above the overflow portion of the bathtub main body 4. The temperature differences ΔT [°C] at the boundary points are found to be 0 [°C], 2 [°C], 7.2 [°C], 10.1 [°C], 15.5 [°C], 17.2 [°C], and 20.5 [°C]. The virtual boundary line P3 is calculated to pass through these multiple temperatures, and indicates the boundary between the region where the mist floats outside the retention space 4 and the mist does not stay in the retention space 4, and the region where the mist stays in the retention space 4 after the rising cloud-like mist is formed above the overflow portion of the bathtub main body. Also, with respect to the boundary point that determines whether the mist stays in the retention space 4 after the rising cloud-like mist is formed above the overflow portion of the bathtub main body 6, or whether the mist stays in the retention space 4 without the rising cloud-like mist being formed above the overflow portion of the bathtub main body, the temperature differences ΔT [°C] are found to be 0 [°C], 2.5 [°C], and 3.3 [°C]. The virtual boundary line P4 is calculated to pass through these multiple temperatures, and indicates the boundary between the region where the mist stays in the retention space 4 after the rising cloud-like mist is formed above the overflow portion of the bathtub main body, and the region where the mist stays in the retention space 4 without the rising cloud-like mist being formed above the overflow portion of the bathtub main body. Therefore, also in FIG. 13, regions N1, N2, and N3 are shown, similar to FIG. 12.

[0062] In FIG. 13, the height at which the mist supplied from the mist supply unit 10 into the retention space 4 drops to the water surface becomes higher than the dropping height in FIG. 12, and the mist diffuses during its descent, making it easier for the density of the mist to decrease. Therefore, the weight of the mist becomes lighter in the retention space 4 and the like, and the mist is more likely to float and disperse. Also, in FIG. 13, the height at which the mist supplied from the mist supply unit 10 into the retention space 4 drops to the water surface becomes higher than the dropping height in FIG. 12, and the mist has a higher speed. Therefore, when the speed of the mist is relatively high compared to the case where the speed of the mist is initially low, the kinetic energy of the mist becomes higher, and the mist is more likely to float and disperse. Further, when the mist reaches the short-side portion 6e on the side opposite to the mist supply side, it is more likely to rise along the wall surface. Therefore, the virtual boundary line P3 has a lower temperature than the virtual boundary line P1, and even when the updraft generated from the difference between the water temperature and the room temperature is weaker (when ΔT is small), it can be seen that the mist floats and disperses above the retention space 4 due to the updraft. Also, the virtual boundary line P4 has a lower temperature than the virtual boundary line P2, and even when the updraft generated from the difference between the water temperature and the room temperature is weaker (when ΔT is small), it shows that after the mist's rising cloud-like body is formed above the overflow portion of the bathtub main body 6, the mist stays in the retention space 4.

[0063] The relationship between the supply flow rate [ml / min] of the mist and the temperature difference ΔT [°C] between the water temperature in the bathtub main body 6 and the room temperature in the bathroom as shown in FIGS. 12 and 13 is shown for the bathtub main body 6. The inventors have confirmed that a similar tendency of the relationship holds not only for the bathtub main body 6 but also for other water-receiving devices with a different volume of the retention space 4 than the bathtub main body 6, such as the bathroom wash floor, shower room, washbasin, washbowl, kitchen sink, toilet, etc. For example, in each of these devices, the volume of the retention space 4 is relatively smaller compared to the volume inside the bathtub main body 6. When the volume of the retention space 4 of the bathtub body 6 is smaller than that shown in Fig. 12, the density of the mist tends to increase and the mist tends to form a retention state. Therefore, the position of the virtual boundary line P1 in Fig. 12 moves upward (e.g., indicated by the virtual boundary line P5). The position of the virtual boundary line P2 in Fig. 12 also moves upward (e.g., indicated by the virtual boundary line P6). Conversely, when the volume of the retention space is larger than that of the retention space 4 of the bathtub body 6 shown in Fig. 12, the density of the mist tends to decrease and the mist is less likely to form a retention state. Therefore, the position of the virtual boundary line P1 in Fig. 12 moves downward (e.g., indicated by the virtual boundary line P7). The position of the virtual boundary line P2 in Fig. 12 also moves downward (e.g., indicated by the virtual boundary line P8).

[0064] In Figs. 12 and 13, the particle size of the mist generated by the ultrasonic vibrator 18 is a predetermined particle size. However, it is also possible to change the particle size of the mist by changing the means for generating the mist (such as a centrifuge) or the frequency of the ultrasonic vibrator. When the particle size of the mist is larger than that of the mist used in Fig. 12, the weight of the mist becomes heavier and the mist tends to form a retention state. Therefore, the position of the virtual boundary line P1 in Fig. 12 moves upward (e.g., indicated by the virtual boundary line P5). Also, the position of the virtual boundary line P2 in Fig. 12 moves upward (e.g., indicated by the virtual boundary line P6). Conversely, when the particle size of the mist is smaller than that of the mist used in Fig. 12, the weight of the mist becomes lighter and the mist is less likely to form a retention state. Therefore, the position of the virtual boundary line P1 in Fig. 12 moves downward (e.g., indicated by the virtual boundary line P7). Also, the position of the virtual boundary line P2 in Fig. 12 moves downward (e.g., indicated by the virtual boundary line P8). In this way, even when the volume of the retention space 4 changes or the particle size of the mist changes, it is possible to understand the relationship between the state where the mist is retained in the retention space 4 and the state where it is not retained based on Figs. 12 and 13, etc.

[0065] Next, with reference to FIGS. 14 to 19, the operation (function) of the mist atmosphere temperature suppression unit 82 of the mist device 1 according to an embodiment of the present invention will be described. FIG. 14 is a flowchart showing an operation of adjusting the temperature of mist to suppress an increase in the atmosphere temperature of the mist staying in the mist device according to an embodiment of the present invention. FIG. 15 is a diagram showing a state where the water temperature in the water storage unit of the mist device according to an embodiment of the present invention is controlled by adjusting a heater. FIG. 16 is a diagram showing a state where the water temperature in the water storage unit of the mist device according to an embodiment of the present invention is controlled by adjusting water supply. Here, in FIGS. 14 and 17, S indicates each step. T11 to T14 in FIG. 15 indicate elapsed times different from T11 to T14 in FIG. 16.

[0066] First, the operation (function) of the mist atmosphere temperature suppression unit 82 of the mist device 1 according to an embodiment of the present invention will be described. In FIG. 14, the mist atmosphere temperature suppression unit 82 suppresses the mist atmosphere temperature by adjusting the water temperature in the water storage unit 12. As shown in FIG. 14, the mist device control unit 26 is in a standby state at the start. In the standby state, the water storage unit 12 is in a state where no water is stored, the water supply path solenoid valve 30 is in a closed state, and the ultrasonic vibrator 18 is stopped. First, in S0, the mist device control unit 26 receives an operation of starting the supply of mist in the mist device operation unit 28 from the standby state, recognizes a request for starting the supply of mist by the user, and starts an operation of starting the supply of mist in the mist device 1, and thus proceeds to S1. In S1, the mist device control unit 26 opens the water supply path solenoid valve 30 and starts supplying water from the water supply path 14 to the water storage unit 12, and proceeds to S2.

[0067] In S2, the mist device control unit 26 determines whether or not the water storage unit 12 has been supplied with water up to a predetermined amount. When the mist device control unit 26 determines that the float switch 29 has not detected that the water level has reached the water supply specified level Q1 and that the water storage unit 12 has not been stored with water up to a predetermined amount, it returns to S2. When the mist device control unit 26 detects that the float switch 29 has detected that the water level has reached the water supply specified water level Q1 and determines that the water has been stored up to a predetermined amount in the water storage unit 12, it proceeds to S3.

[0068] In S3, the mist device control unit 26 closes the water supply path solenoid valve 30 to stop the water supply from the water supply path 14 to the water storage unit 12, and proceeds to S4. In S4, the mist device control unit 26 starts heating the water by the heater 20 and proceeds to S5.

[0069] In S5, the mist device control unit 26 determines whether the water temperature in the water storage unit 12 is 60°C or higher and 65°C or lower. If the water temperature in the water storage unit 12 measured by the water temperature measuring device 22 is not 60°C or higher and 65°C or lower, it can be determined that the temperature of the mist that can be generated in the water storage unit 12 is outside the range of 60°C or higher and 65°C or lower and temperature adjustment is necessary, so it proceeds to S6. If the water temperature in the water storage unit 12 measured by the water temperature measuring device 22 is 60°C or higher and 65°C or lower, the mist device control unit 26 can determine that the temperature of the mist that can be generated in the water storage unit 12 is within the range of 60°C or higher and 65°C or lower, so it proceeds to S9.

[0070] In S6, the mist device control unit 26 determines whether the water temperature in the water storage unit 12 < 60°C. If the water temperature in the water storage unit 12 measured by the water temperature measuring device 22 is not < 60°C, it can be determined that the water temperature in the water storage unit 12 is greater than 65°C and it is necessary to lower the temperature of the generated mist, so it proceeds to S7. If the water temperature in the water storage unit 12 measured by the water temperature measuring device 22 is < 60°C, it can be determined that the water temperature in the water storage unit 12 has dropped below 60°C or has not reached 60°C and it is necessary to increase the temperature of the mist that can be generated, so it proceeds to S8.

[0071] In S7, the mist device control unit 26 turns off the heater 20, reduces the output of the heater 20, and / or opens the water supply passage solenoid valve 30 to supply water into the water storage unit 12 so as to lower the water temperature in the water storage unit 12. For example, the mist device control unit 26 turns off the heater 20, reduces the output of the heater 20, or opens the water supply passage solenoid valve 30 to supply water into the water storage unit 12. When water reaches the upper end of the overflow pipe 31 due to the water supply into the water storage unit 12, the water is discharged from the overflow pipe 31 so that the water level does not rise any further. The mist device control unit 26 returns to S5. For example, as shown in FIG. 15, when the water temperature exceeds 65° C. at the elapsed time T1 (T5) from 0 seconds (start of mist supply), the mist device control unit 26 turns off the heater 20 or reduces the output of the heater 20. Therefore, the water temperature returns to 65° C. again at the elapsed time T2 (T6) and then further decreases. Also, for example, as shown in FIG. 16, when adjusting the water temperature by water supply, when the water temperature exceeds 65° C. at the elapsed time T11 (T13) from 0 seconds (start of mist supply), the mist device control unit 26 may open the water supply passage solenoid valve 30 to supply water into the water storage unit 12. By supplying water into the water storage unit 12, the water temperature in the water storage unit 12 decreases. Note that the timing for turning off the heater 20 or the like is not limited to the case where it is determined in S6 that the water temperature is not less than 60° C., and may be changed to the case where it is determined in S5 that the water temperature is 60° C. or higher.

[0072] In S8, the mist device control unit 26 turns on the heater 20 so as to raise the water temperature in the water storage unit 12 (if the heater 20 is already on, continue it; if the heater 20 is off, change it from the off state to the on state). If the output of the heater 20 is decreasing, increase the output of the heater 20, and return to S5. For example, as shown in FIG. 15, when the water temperature becomes less than 60° C. at the elapsed time T3, the mist device control unit 26 turns on the heater 20 or increases the output of the heater 20 if the output of the heater 20 is decreasing. Therefore, the water temperature returns to 60° C. again at the elapsed time T4 and further increases. Note that the timing for turning on the heater 20 etc. is not limited to the case where it is determined in S6 that the water temperature is less than 60° C., and may be changed to the case where it is determined in S5 that the water temperature is less than 65° C. (or 65° C. or less).

[0073] In S9, when the mist device control unit 26 first becomes YES in S5 and proceeds to S9, it generates mist by driving the ultrasonic vibrator 18. In S9, when the ultrasonic vibrator 18 is already being driven in S5, the mist device control unit 26 continues to drive the ultrasonic vibrator 18. Note that in S9, when the water supply path solenoid valve 30 is open and water is being supplied into the water storage unit 12 in S5, the mist device control unit 26 closes the water supply path solenoid valve 30 to stop the water supply into the water storage unit 12. For example, as shown in FIG. 16, when adjusting the water temperature by water supply, since the water temperature returns to 65° C. again at the elapsed time T12 (T14), the mist device control unit 26 closes the water supply path solenoid valve 30. Thereafter, after the water temperature in the water storage unit 12 slightly decreases, it increases again by the heating of the heater 20. Therefore, the water temperature in the water storage unit 12 is controlled within the range of 60° C. or more and 65° C. or less. Note that the timing for closing the water supply path solenoid valve 30 etc. is not limited to the case where the water temperature becomes 65° C. or less, and may be other predetermined water temperature cases etc.

[0074] In S10, the mist device control unit 26 determines whether or not a predetermined time TX has elapsed since the execution of the start of mist supply in S9. When the predetermined time has not elapsed since the start of mist supply, the mist device control unit 26 can determine that it is an initial stage after the start of mist supply. Therefore, in order to realize a relatively warm mist bath from the initial stage of the mist bath, the mist atmosphere temperature is warmed relatively early by slightly high-temperature mist up to 65°C or lower, and the process returns to S5. When the predetermined time TX has elapsed since the execution of the start of mist supply in S9, the process proceeds to S11. The predetermined time TX is set as the time from 0 seconds of the start of mist supply until the initial state of mist supply ends. For example, the predetermined time TX is set as a standard time for forming a mist retention state and a retention layer C in the bathtub main body 6. That is, in the initial stage of mist supply, which is a time before the predetermined time TX, it is a transitional state before the formation of the mist retention state, and in the later stage of mist supply, which is a time after the predetermined time TX, it is a state of maintaining the mist retention state.

[0075] In S11, the mist device control unit 26 determines whether or not the water temperature of the water in the water storage unit 12 is 55°C or higher and 60°C or lower. That is, in the later stage of supply, the mist device control unit 26 sets the center value of the water temperature in the water storage unit 12 (for example, the median value 57.5°C between the minimum value 55°C and the maximum value 60°C) to be lower than the center value of the water temperature in the water storage unit 12 in the initial stage of supply (for example, the median value 62.5°C between the minimum value 60°C and the maximum value 65°C). When the water temperature of the water in the water storage unit 12 measured by the water temperature measuring device 22 is not 55°C or higher and 60°C or lower, the mist device control unit 26 can determine that the temperature of the mist that can be generated in the water storage unit 12 is outside the range of 55°C or higher and 60°C or lower, and that temperature adjustment is necessary, so the process proceeds to S12. When the water temperature of the water in the water storage unit 12 measured by the water temperature measuring device 22 is 55°C or higher and 60°C or lower, the mist device control unit 26 can determine that the temperature of the mist that can be generated in the water storage unit 12 is within the range of 55°C or higher and 60°C or lower, so the process proceeds to S15.

[0076] In S12, the mist device control unit 26 determines whether the water temperature in the water storage unit 12 is < 55°C. If the water temperature in the water storage unit 12 measured by the water temperature measuring device 22 is not < 55°C, the mist device control unit 26 can determine that the water temperature in the water storage unit 12 is greater than 60°C, and can determine that it is necessary to lower the temperature of the generated mist, so it proceeds to S13. If the water temperature in the water storage unit 12 measured by the water temperature measuring device 22 is < 55°C, the mist device control unit 26 can determine that the water temperature in the water storage unit 12 has dropped to a value less than 55°C, and can determine that it is necessary to increase the temperature of the mist that can be generated, so it proceeds to S14.

[0077] In S13, the mist device control unit 26 turns off the heater 20, reduces the output of the heater 20, and / or opens the water supply path solenoid valve 30 to supply water into the water storage unit 12 so as to lower the water temperature in the water storage unit 12. When water reaches the upper end of the overflow pipe 31 due to the water supply into the water storage unit 12, the water is discharged from the overflow pipe 31, and the water level does not rise any further. The mist device control unit 26 returns to S11. For example, as shown in FIG. 15, when the water temperature exceeds 60°C at the elapsed time T9 (T13), the mist device control unit 26 turns off the heater 20 or reduces the output of the heater 20. Therefore, the water temperature returns to 60°C again at the elapsed time T10 (T14) and further decreases. Also, for example, as shown in FIG. 15, when adjusting the water temperature by water supply, if the water temperature exceeds 60°C beyond the elapsed time TX, the mist device control unit 26 opens the water supply path solenoid valve 30 to supply water into the water storage unit 12. When water is supplied into the water storage unit 12, the water temperature in the water storage unit 12 decreases. Also, for example, as shown in FIG. 15, when adjusting the water temperature by water supply, if the water temperature exceeds 60°C at the elapsed time T16 (T18, T20), the mist device control unit 26 opens the water supply path solenoid valve 30 to supply water into the water storage unit 12. When water is supplied into the water storage unit 12, the water temperature in the water storage unit 12 decreases.

[0078] In S14, the mist device control unit 26 turns on the heater 20 so as to raise the water temperature in the water storage unit 12 (if the heater 20 is already on, this state is continued; if the heater 20 is off, it is changed from the off state to the on state), and returns to S11. For example, as shown in FIG. 15, when the water temperature becomes less than 55° C. at the elapsed time T7 (T11), the mist device control unit 26 turns on the heater 20, or increases the output of the heater 20 if the output of the heater 20 has been decreased. Thus, the water temperature returns to 55° C. again at the elapsed time T8 (T12) and further increases. Note that the timing for turning on the heater 20 etc. is not limited to the case where the water temperature is determined to be less than 55° C. in S12, and may be changed to the case where the water temperature is determined to be 60° C. or less in S11 etc.

[0079] In S15, when water is being supplied into the water storage unit 12, the mist device control unit 26 closes the water supply passage solenoid valve 30 to stop the water supply into the water storage unit 12, and proceeds to S16. For example, as shown in FIG. 16, when adjusting the water temperature by water supply, since the water temperature becomes 60° C. or less at the elapsed time T15 (T17, T19, T21), the mist device control unit 26 closes the water supply passage solenoid valve 30. Thereafter, after the water temperature in the water storage unit 12 slightly decreases, it increases again by the heating of the heater 20. Thus, the water temperature in the water storage unit 12 is controlled within the range of 55° C. or more and 60° C. or less. Note that the timing for closing the water supply passage solenoid valve 30 etc. is not limited to the case where the water temperature becomes 60° C. or less, and may be other predetermined water temperature cases etc.

[0080] In S16, the mist device control unit 26 determines whether or not it has received an input to end mist supply from the mist device operation unit 28. When the mist device operation unit 28 has received an input to end mist supply by the operation of the user on the mist device operation unit 28, the mist device control unit 26 proceeds to End to end the mist supply operation of the mist device 1. When the mist device operation unit 28 has not received an input to end mist supply, the mist device control unit 26 returns to S11.

[0081] Next, the operation (function) of a modified example of the mist atmosphere temperature suppression unit 82 of the mist device 1 according to an embodiment of the present invention will be described. In FIG. 17, the mist atmosphere temperature suppression unit 82 suppresses the mist atmosphere temperature by adjusting the flow rate of the mist supplied to the retention space. In FIG. 17, since control substantially the same as the control in FIG. 14 is being performed, reference signs S0 to S16 are commonly used to show the control flow. Also, in FIGS. 18 and 19, since the time course of the water temperature shown is substantially the same as the time course of the water temperature in FIGS. 15 and 16, common reference signs T1 to T21 are used to show the time course of the water temperature and the flow rate. T11 to T14 in FIG. 18 show a different elapsed time from T11 to T14 in FIG. 19.

[0082] As shown in FIG. 17, the mist device control unit 26 is in a standby state at the start. In the standby state, the water storage unit 12 is in a state where no water is stored, and the water supply path solenoid valve 30 is in a closed state. The ultrasonic vibrator 18 is stopped. First, at S0, the mist device control unit 26 receives an operation to start the supply of mist at the mist device operation unit 28, recognizes a request from the user to start the mist supply, and starts an operation to start the mist supply in the mist device 1, and thus proceeds to S1. At S1, the mist device control unit 26 opens the water supply path solenoid valve 30 and starts supplying water from the water supply path 14 to the water storage unit 12, and proceeds to S2.

[0083] At S2, the mist device control unit 26 determines whether or not the water storage unit 12 has been supplied with water up to a predetermined amount. When the mist device control unit 26 determines that the float switch 29 has not detected that the water level has reached the water supply specified level Q1 and that the water storage unit 12 has not been stored with water up to a predetermined amount, it returns to S2. When the mist device control unit 26 detects that the float switch 29 has detected that the water level has reached the water supply specified level Q1 and determines that the water storage unit 12 has been stored with water up to a predetermined amount, it proceeds to S3.

[0084] In S3, the mist device control unit 26 closes the water supply line solenoid valve 30 to stop the water supply from the water supply line 14 to the water storage unit 12, and proceeds to S4. In S4, the mist device control unit 26 starts heating the water by the heater 20 and proceeds to S5.

[0085] In S5, the mist device control unit 26 determines whether the water temperature in the water storage unit 12 is 60°C or higher and 65°C or lower. If the water temperature in the water storage unit 12 measured by the water temperature measuring device 22 is not 60°C or higher and 65°C or lower, the mist supply amount (mist generation amount) generated in the water storage unit 12 will be less than or more than the mist supply amount at a water temperature of 60°C or higher and 65°C or lower, and it can be determined that the adjustment of the mist supply amount is necessary. Therefore, the process proceeds to S6. If the water temperature in the water storage unit 12 measured by the water temperature measuring device 22 is 60°C or higher and 65°C or lower, it can be determined that the mist supply amount (mist generation amount) generated in the water storage unit 12 will be the initial assumed mist supply amount at a water temperature of 60°C or higher and 65°C or lower. Therefore, the process proceeds to S9.

[0086] In S6, the mist device control unit 26 determines whether the water temperature in the water storage unit 12 < 60°C. If the water temperature in the water storage unit 12 measured by the water temperature measuring device 22 is not < 60°C, it can be determined that the water temperature in the water storage unit 12 is greater than 65°C and the generated mist supply amount will be more than the assumed mist supply amount. Therefore, it can be determined that it is necessary to reduce the mist supply amount, and the process proceeds to S7. If the water temperature in the water storage unit 12 measured by the water temperature measuring device 22 is < 60°C, it can be determined that the water temperature in the water storage unit 12 has dropped to a value less than 60°C or has not reached 60°C, and the generated mist supply amount will be less than the assumed mist supply amount. Therefore, it can be determined that it is necessary to increase the mist supply amount, and the process proceeds to S8.

[0087] In S7, the mist device control unit 26 turns off the heater 20, reduces the output of the heater 20, and / or opens the water supply path solenoid valve 30 to supply water into the water storage unit 12 so as to lower the water temperature in the water storage unit 12 and reduce the mist supply amount. When water reaches the upper end of the overflow pipe 31 due to the water supply into the water storage unit 12, the water is discharged from the overflow pipe 31 so that the water level does not rise any further. The mist device control unit 26 returns to S5. For example, as shown in FIG. 18, when the water temperature exceeds 65° C. at the elapsed time T1 (T5) from 0 seconds, the mist device control unit 26 turns off the heater 20 or reduces the output of the heater 20. Therefore, the water temperature returns to 65° C. again at the elapsed time T2 (T6) and then further decreases. The mist supply amount from the mist generation unit 8 and the mist supply unit 10 to the retention space 4 also decreases in conjunction with the water temperature. Also, for example, as shown in FIG. 19, when adjusting the water temperature by water supply, when the water temperature exceeds 65° C. at the elapsed time T11 (T13), the mist device control unit 26 may open the water supply path solenoid valve 30 to supply water into the water storage unit 12. By supplying water into the water storage unit 12, the water temperature in the water storage unit 12 decreases. The mist supply amount also decreases in conjunction with the water temperature. Note that the timing for turning off the heater 20 or the like is not limited to the case where it is determined in S6 that the water temperature is not less than 60° C., and may be changed to the case where it is determined in S5 that the water temperature is 60° C. or higher.

[0088] In S8, the mist device control unit 26 turns on the heater 20 so as to raise the water temperature in the water storage unit 12 (if the heater 20 is already on, it continues; if the heater 20 is off, it changes from the off state to the on state). If the output of the heater 20 is decreasing, the output of the heater 20 is increased, and the process returns to S5. For example, as shown in FIG. 18, when the water temperature becomes less than 60° C. at the elapsed time T3, the mist device control unit 26 turns on the heater 20 or increases the output of the heater 20 if the output of the heater 20 is decreasing. Therefore, the water temperature returns to 60° C. again at the elapsed time T4 and further increases. The mist supply amount also increases in the same manner in conjunction with the water temperature. Note that the timing for turning on the heater 20 etc. is not limited to the case where the water temperature becomes less than 60° C. in S6, and may be changed to the case where the water temperature becomes 65° C. or less in S5 etc.

[0089] In S9, when the mist device control unit 26 first becomes YES in S5 and proceeds to S9, the mist device control unit 26 generates mist by driving the ultrasonic vibrator 18. In S9, when the ultrasonic vibrator 18 is already being driven in S5, the mist device control unit 26 continues to drive the ultrasonic vibrator 18. Note that in S9, when the water supply path solenoid valve 30 is open and water is being supplied into the water storage unit 12 in S5, the mist device control unit 26 closes the water supply path solenoid valve 30 to stop the water supply into the water storage unit 12. For example, as shown in FIG. 19, when adjusting the water temperature by water supply, since the water temperature returns to 65° C. again at the elapsed time T12 (T14), the mist device control unit 26 closes the water supply path solenoid valve 30. Thereafter, the water temperature in the water storage unit 12 slightly decreases and then increases again by the heating of the heater 20. Therefore, the water temperature in the water storage unit 12 is controlled within the range of 60° C. or more and 65° C. or less, and the mist supply amount becomes approximately the assumed mist supply amount. Note that the timing for closing the water supply path solenoid valve 30 etc. is not limited to the case where the water temperature becomes 65° C. or less, and may be other predetermined water temperature cases etc.

[0090] In S10, the mist device control unit 26 determines whether or not a predetermined time TX has elapsed since the execution of the start of mist supply in S9. When the predetermined time TX has not elapsed since the execution of S9 (start of mist supply), the mist device control unit 26 can determine that it is an initial stage after the start of mist supply. Therefore, in order to realize a relatively warm mist bath from the initial stage of the mist bath, the mist device control unit 26 returns to S5 so as to increase the mist atmosphere temperature relatively early with a relatively large mist supply amount. When the predetermined time TX has elapsed since the execution of the start of mist supply in S9, the mist device control unit 26 proceeds to S11. The predetermined time TX is set as the time when the initial state of mist supply ends from 0 seconds after the start of mist supply. For example, the predetermined time TX is set as a standard time when a retention state of mist and a retention layer C are formed in the bathtub main body 6. That is, in the initial stage of mist supply, which is a time before the predetermined time TX, it is a transitional state before the formation of the mist retention state, and in the later stage of mist supply, which is a time after the predetermined time TX, it is a state of maintaining the mist retention state.

[0091] In S11, the mist device control unit 26 determines whether or not the water temperature of the water in the water storage unit 12 is 55°C or higher and 60°C or lower. That is, in the later stage of supply, the mist device control unit 26 sets the center value of the water temperature in the water storage unit 12 (for example, the median value 57.5°C between the minimum value 55°C and the maximum value 60°C) to be lower than the center value of the water temperature in the water storage unit 12 in the initial stage of supply (for example, the median value 62.5°C between the minimum value 60°C and the maximum value 65°C). When the water temperature of the water in the water storage unit 12 measured by the water temperature measuring device 22 is not 55°C or higher and 60°C or lower, the mist device control unit 26 can determine that it is a case where the mist supply amount (mist generation amount) generated in the water storage unit 12 is less than or more than the mist supply amount at a water temperature of 55°C or higher and 60°C or lower, and thus adjustment of the mist supply amount is necessary. Therefore, the mist device control unit 26 proceeds to S12. When the water temperature of the water in the water storage unit 12 measured by the water temperature measuring device 22 is 55°C or higher and 60°C or lower, the mist device control unit 26 can determine that the mist supply amount (mist generation amount) that can be generated in the water storage unit 12 is the initial assumed mist supply amount at a water temperature of 55°C or higher and 60°C or lower. Therefore, the mist device control unit 26 proceeds to S15.

[0092] In S12, the mist device control unit 26 determines whether the water temperature in the water storage unit 12 is < 55°C. When the water temperature measured by the water temperature measuring device 22 in the water storage unit 12 is not < 55°C, the mist device control unit 26 can determine that the water temperature in the water storage unit 12 becomes a value greater than 60°C and the generated mist supply amount becomes larger than the assumed mist supply amount. Therefore, it can be determined that it is necessary to reduce the mist supply amount, and the process proceeds to S13. When the water temperature measured by the water temperature measuring device 22 in the water storage unit 12 is < 55°C, the mist device control unit 26 can determine that the water temperature in the water storage unit 12 has dropped to a value lower than 55°C and the generated mist supply amount becomes smaller than the assumed mist supply amount. Therefore, it can be determined that it is necessary to increase the mist supply amount, and the process proceeds to S14.

[0093] In S13, the mist device control unit 26 turns off the heater 20, reduces the output of the heater 20, and / or opens the water supply path solenoid valve 30 to supply water into the water storage unit 12 so as to lower the water temperature in the water storage unit 12 and reduce the mist supply amount. When water reaches the upper end of the overflow pipe 31 due to the water supply into the water storage unit 12, the water is discharged from the overflow pipe 31, and the water level does not rise any further. The mist device control unit 26 returns to S11. For example, as shown in FIG. 18, when the water temperature exceeds 60°C at the elapsed time T9 (T13), the mist device control unit 26 turns off the heater 20 or reduces the output of the heater 20. Therefore, the water temperature returns to 60°C again at the elapsed time T10 (T14) and further decreases. The mist supply amount also decreases in conjunction with the water temperature. Also, for example, as shown in FIG. 19, when adjusting the water temperature by water supply, when the water temperature exceeds 60°C beyond the elapsed time TX, the mist device control unit 26 opens the water supply path solenoid valve 30 to supply water into the water storage unit 12. By supplying water into the water storage unit 12, the water temperature in the water storage unit 12 decreases. The mist supply amount also decreases in conjunction with the water temperature. 19, when adjusting the water temperature by supplying water, if the water temperature exceeds 60°C at elapsed time T16 (T18, T20), the mist device control unit 26 opens the water supply line solenoid valve 30 to supply water into the water storage unit 12. As water is supplied into the water storage unit 12, the water temperature inside the water storage unit 12 drops. The amount of mist supplied is also reduced in conjunction with the water temperature.

[0094] In S14, the mist device control unit 26 turns the heater 20 on so as to raise the water temperature in the water storage unit 12 (if the heater 20 is already on, it continues to be on, and if the heater 20 is off, it changes from the off state to the on state), increases the output of the heater 20 if the output of the heater 20 is reduced, and returns to S11. For example, as shown in FIG. 18, if the water temperature becomes less than 55°C at the elapsed time T7 (T11), the mist device control unit 26 turns the heater 20 on, or increases the output of the heater 20 if the output of the heater 20 is reduced. Thus, the water temperature returns to 55°C again at the elapsed time T8 (T12) and further rises. The timing for turning the heater 20 on is not limited to when the water temperature becomes less than 55°C, but may be when the water temperature becomes less than 60°C (or 60°C or less), etc.

[0095] In S15, if water is being supplied to the water storage section 12, the mist device control section 26 closes the water supply line solenoid valve 30 to stop the supply of water to the water storage section 12, and proceeds to S16. For example, as shown in FIG. 19, when adjusting the water temperature by supplying water, the water temperature becomes 60°C or less at the elapsed time T15 (T17, T19, T21), so the mist device control section 26 closes the water supply line solenoid valve 30. After that, the water temperature in the water storage section 12 drops slightly, and then increases again due to the heating of the heater 20. Therefore, the water temperature in the water storage section 12 is controlled to be within a range of 55°C or more and 60°C or less, and the mist supply amount is generally set to the expected mist supply amount. The timing for closing the water supply line solenoid valve 30 is not limited to when the water temperature becomes 60°C or less, and may be when the water temperature is other predetermined water temperatures.

[0096] In S16, the mist device control unit 26 determines whether or not it has received an input to end the mist supply from the mist device operation unit 28. When the mist device operation unit 28 receives an input to end the mist supply due to the operation of the mist device operation unit 28 by the user, the mist device control unit 26 proceeds to END in order to end the mist supply operation of the mist device 1. When the mist device operation unit 28 has not received an input to end the mist supply, the mist device control unit 26 returns to S11.

[0097] Incidentally, as a modification of the operation (function) of the mist atmosphere temperature suppression unit 82 of the mist device 1, the mist atmosphere temperature suppression unit 82 may adjust the flow rate of the mist supplied to the retention space by changing the number of operations of the ultrasonic vibrator 18, thereby suppressing the mist atmosphere temperature. For example, when the number of ultrasonic vibrators 18 driven in S9 in FIG. 14 is N, in the latter stage of mist supply after S11, the number of ultrasonic vibrators 18 driven is S. At this time, S < N. Therefore, the mist supply amount in the latter stage of mist supply can be made smaller than the mist supply amount in the initial stage of mist supply. Further, the mist atmosphere temperature suppression unit 82 may adjust the supply flow rate of the mist supplied to the retention space by changing the voltage output of the ultrasonic vibrator 18.

[0098] Next, with reference to FIG. 20, a method for measuring the atmosphere temperature of the mist in the bathtub body 6 will be described. The atmosphere temperature [°C] of the mist in the bathtub body 6 is measured using a temperature measuring device capable of measuring the temperature of air, for example, a thermistor 95. When it is desired to measure the atmosphere temperature of the mist in the bathtub body 6, the thermistor 95 is arranged for measurement. The temperature measuring unit of the thermistor 95 is arranged at the center of the long side and the center of the short side of the bathtub body 6 and at the center of the height from the surface of the water stored in the bathtub body 6 to the overflow surface 6b, and is configured to measure the temperature of the mist. For example, the atmosphere temperature of the mist in the bathtub body 6 is measured at a temperature at which sufficient time has elapsed (for example, 2500 [s] has elapsed) after the start of mist supply and the temperature rise has almost stopped. Care is taken so that no extreme gradient occurs in the temperature of the measurement target during measurement.

[0099] Next, with reference to FIG. 20, a method for measuring the water temperature (hot water temperature) in the bathtub main body 6 will be described. The water temperature [°C] in the bathtub main body 6 is measured using a temperature measuring device capable of measuring the water temperature, for example, a thermistor 99. When it is desired to measure the water temperature in the bathtub main body 6, the thermistor 99 is arranged at a predetermined position in the bathtub main body to measure the water temperature. The temperature measuring part of the thermistor 99 is arranged at the center of the long side, the center of the short side, and the center of the depth of the water stored in the bathtub main body 6, and is adapted to measure the water temperature. Care is taken so that no extreme gradient occurs in the temperature of the measurement target during measurement.

[0100] Next, with reference to FIG. 20, a method for measuring the room temperature in the bathroom provided with the bathtub main body 6 will be described. Since the mist generation unit 8 includes an indoor thermometer 24, the room temperature is basically measured by the indoor thermometer 24. When the mist generation unit 8 does not include the indoor thermometer 24 or when the room temperature cannot be measured (or is difficult to measure) by the indoor thermometer 24, the thermistor 86 is arranged at a predetermined position near the bathtub main body in the bathroom space to measure the room temperature. The temperature measuring part of this thermistor 86 is arranged, for example, at a position 200 mm to the side of the bathtub main body 6, at a position 200 mm in front of the wall on the back side of the paper along the long side direction of the bathtub main body, and at a position 1000 mm above the floor surface, and is adapted to measure the room temperature. Care is taken so that no extreme gradient occurs in the temperature of the measurement target during measurement.

[0101] Next, with reference to FIG. 21, a measuring device and a measuring method for the flow rate of the mist supplied from the mist supply unit 10 will be described. The flow rate measuring device 90 for the mist flow rate includes a mist generating unit 8, a mist supply unit 10, a support structure 91 that supports the mist generating unit 8 and the mist supply unit 10 on a water storage tank, a water storage tank 92 for storing water, a water supply pump 94 that supplies water from the water storage tank 92 to the mist generating unit 8, a fan 96 that sends out the mist supplied from the mist supply unit 10 to the outside of the flow rate measuring device 90, and an electronic balance 98 for measuring weight. The ultrasonic vibrator 18 of the mist generating unit 8 is driven by an oscillation circuit 93 attached to the support structure 91. The water supply pump 94 and the fan 96 are supported by the support structure 91. That is, the flow rate measuring device 90 is configured with the water used for mist generation and the mist generating unit 8 used for mist generation etc. placed on the electronic balance 98. The electronic balance 98 uses GF-32K manufactured by A&D Company.

[0102] In the flow rate measuring device 90, in the state before mist generation, the weights of the mist generation unit 8, the mist supply unit 10, the support structure 91, the water storage tank 92 storing water, the water supply pump 94, and the fan 96 (hereinafter referred to as the weights of the mist generation unit 8, etc.) are measured with them placed on the electronic balance 98. Thereafter, mist generation is performed while these mist generation units 8, etc. remain placed on the electronic balance 98. In such a flow rate measuring device 90, water is supplied to the mist generation unit 8 by the water supply pump 94, and the water level is kept substantially fixed by draining water from the overflow pipe 31. Mist is generated by driving the ultrasonic vibrator 18, and the mist flowing out from the mist supply unit 10 is sent out to the outside of the flow rate measuring device 90 by the fan 96. After the start of driving of the ultrasonic vibrator 18, at the point when one minute has elapsed, the driving of the ultrasonic vibrator 18 is stopped, and the weights of the mist generation unit 8, etc. are measured by the electronic balance 98. Therefore, the amount of decrease during mist generation can be obtained by the following formula: "Amount of decrease during mist generation = Weight of the mist generation unit 8, etc. before mist generation - Weight of the mist generation unit 8, etc. after mist generation". Then, the supply flow rate of the mist can be obtained by the following formula: "Mist supply flow rate [ml / min] = Amount of decrease during mist generation - Evaporation amount". The mist supply flow rate [ml / min] thus obtained is determined by performing a similar series of three measurements of the mist supply flow rate [ml / min] and taking the average of the measurement results to obtain the final mist supply flow rate [ml / min]. Also, the evaporation amount takes into account the natural evaporation amount during the measurement. Therefore, in the flow rate measuring device 90, the ultrasonic vibrator 18 is not driven, and the amount of weight decrease after one minute has elapsed is measured. A similar series of three measurements of the amount of weight decrease are performed, and the average of the measurement results is taken to determine the final amount of weight decrease as the evaporation amount and used in the calculation of the above-mentioned mist supply flow rate.

[0103] In the flow rate measuring device 90, measurement is performed so that water other than mist (for example, water droplets of a water column generated by an ultrasonic vibrator, etc.) does not jump out of the flow rate measuring device 90. Further, even when a part of the generated mist returns to water in the mist supply unit 10, the flow rate measuring device 90 is configured so that this water returns to the water storage tank 92 or the like. The fan 96 is set to an air volume and direction such that the mist can flow outward without accumulating in the mist supply unit 10 and the mist generation unit 8.

[0104] Next, with reference to FIGS. 22 to 24, a measuring device and a measuring method for the particle size of the mist supplied from the mist supply unit 10 will be described. The mist particle size measuring device 37 includes a box-shaped device 39 that sets a virtual residence space 34 having the same size and shape as described above, and a particle size distribution measuring device 53. A square opening 52 of 20 mm × 20 mm is formed near the center of the side wall of the box-shaped device 39, that is, the side wall on the side of the virtual residence space 34, and a lid 57 is attached to the opening 52. When measuring the particle size of the mist, the measurement of the particle size of the mist is performed by arranging the mist particle size measuring device 37 instead of the bathtub main body 6. The measuring device 37 is arranged so that the positional relationship between the mist supply unit 10 and the measuring device 37 is substantially the same as the positional relationship between the lower end of the mist supply unit 10 and the bathtub main body 6, and the mist is supplied from the mist supply unit 10 to the measuring device 37 in the same manner as the supply of the mist from the mist supply unit 10 to the bathtub main body 6.

[0105] As shown in FIG. 23, the particle size distribution measuring device 53 includes a particle size measuring laser 54 arranged so that a measurement region E of the particle size measuring laser is located near and in front of the opening 52. In a top view, the particle size measuring laser 54 is arranged so that the laser beam of the particle size measuring laser 54 is parallel to the long side of the virtual residence space 34. The measurement region E through which the laser beam emitted from the particle size measuring laser 54 passes is located in front of the opening 52. The measurement region E is located at a distance of 150 mm from the opening 52. The particle size distribution measuring device 53 further includes a measurement lens 56 for detecting the diffracted / scattered light of this laser beam.

[0106] With the lid 57 attached to this opening, start supplying mist into the virtual residence space 34. The mist supply port from the mist supply unit 10 is not shown in the figure. After 1 minute from the start of mist supply, open the lid 57 and let the mist leak toward the measurement region E of the particle size measurement laser 54. Measure the scattered light distribution with the measurement lens 56 in a state where the transmittance of the particle size measurement laser 54 is 60% - 90%. For example, as the particle size measurement laser 54 and the measurement lens 56, use the LDSA - SPR1500A of the Aerotrack LDSA - SPR series of the spray particle size distribution measuring device manufactured by Microtrac Bell Corporation. Measure the particle size distribution data 10 times and record this particle size distribution data on the PC. Average the 10 times of particle size distribution data on the PC. FIG. 24 shows an example of the particle size distribution data measured by the particle size distribution measuring device 53. In FIG. 24, the frequency [%] is shown on the left vertical axis, the cumulative [%] is shown on the right vertical axis, and the particle size [μm] is shown on the horizontal axis. For example, the PC analyzes the particle size distribution data obtained in this way, and may obtain, for example, the 20% tile value particle size G of the particle size distribution data as the particle size data, or may obtain, for example, the Sauter mean particle size H as the particle size data. The Sauter mean particle size indicates the particle size having the same surface area - to - volume ratio as the total volume of all particles with respect to the total surface area of all particles. By obtaining the average particle size based on the Sauter mean particle size, the influence on the measured value by particles having a small number of large particle sizes can be suppressed. In this way, the main (for example, more than half) particle size of the mist supplied from the mist supply unit 10 can be measured. The Sauter mean particle size H of the mist supplied from the mist device in this embodiment is 3.1 μm or more and 10 μm or less.

[0107] The Sauter mean particle size H of the mist can be changed by changing the output of the ultrasonic vibrator 18 of the mist generation unit 8, changing the vibration frequency of the ultrasonic vibrator 18, or changing the mist generation means to a centrifugal separator or the like. For example, it is also possible to change and set the Sauter mean particle size H of the mist supplied from the mist supply unit 10 within the range of 3.1 μm or more and 40 μm or less.

[0108] Next, with reference to FIG. 25, a determination device and a determination method for determining whether mist is in a retained state (whether a mist retention layer C is formed) in the retention space 4 in the bathtub main body 6 will be described. As shown in FIG. 25, the internal transmittance measured inside the retention space 4 in the bathtub main body 6 using the transmittance measurement device 68 is compared with the external transmittance measured outside the retention space 4. When the internal transmittance is lower than the external transmittance, it can be determined that mist is retained inside the retention space 4. More specifically, when the internal transmittance / external transmittance < 1, it is determined that mist is retained inside the retention space 4.

[0109] For example, as shown in FIG. 11, in a state where mist is retained inside the retention space 4, the internal transmittance decreases. On the other hand, the mist mainly stays inside the retention space 4, and the external transmittance measured above the retention interface 66 is a relatively high value. Therefore, the internal transmittance / external transmittance < 1, and it is determined that mist is retained inside the retention space 4. Note that when the internal transmittance is within the range of 15% or less, it may be determined that mist is retained inside the retention space 4.

[0110] Next, with reference to FIG. 25, the transmittance measurement device 68 will be described. Whether a retained state is formed can be determined by attaching the transmittance measurement device 68 to the bathtub main body 6. The transmittance measurement device 68 includes a first laser device 70 with a measurement unit disposed inside the retention space 4 and a first transmittance measurement device 72 that receives the laser. The first laser device 70 and the first transmittance measurement device 72 are arranged horizontally 150 mm apart at a position 150 mm below the upper end of the retention space 4 (for example, at a depth position about 30% of the depth of the retention space 4). The first laser device 70 and the first transmittance measurement device 72 are arranged near the center of the retention space 4 in a top view. The intensity of the laser light measured by the first transmittance measurement device 72 is measured with respect to the intensity of the laser light oscillated from the first laser device 70, and the internal transmittance is measured. The transmittance measuring device 68 further includes a second laser device 74 disposed outside the residence space 4 and a second transmittance measuring device 76 that receives the laser. The second laser device 74 and the second transmittance measuring device 76 are horizontally separated and disposed at a position 150 mm above the upper end of the residence space 4 (for example, a position assumed to be above the residence boundary surface 66 at the upper end of the residence layer C). The first laser device 70 and the first transmittance measuring device 72 are disposed near the center of the residence space 4 in a top view. The intensity of the laser light measured by the second transmittance measuring device 76 is measured with respect to the intensity of the laser light oscillated from the second laser device 74, and the external transmittance is measured. In this way, the internal transmittance and the external transmittance in the residence space 4 can be measured respectively. As a more specific device configuration of the measuring device 68, the laser light emitted from the digital fiber amplifier FS-N11MN manufactured by Keyence Corporation is oscillated through the FU-77TZ manufactured by the same company (the first laser device 70 or the second laser device 74), and received by the FU-77TZ manufactured by the same company (the first transmittance measuring device 72 or the second transmittance measuring device 76). The received light is returned to the fiber amplifier FS-N11MN, and a voltage output of, for example, 1 - 5V is performed according to the amount of light. The amount of light is, for example, 1500 - 4500. The output voltage is measured by the NR-500 series NR-HA08 manufactured by the same company and scaled to a value of 0 - 100% on a PC. The transmittance data is measured, for example, at a sampling period of 100 ms. For example, after the mist is supplied almost quantitatively and the residence layer C is formed, the transmittance data for, for example, 30 seconds is averaged and calculated. For example, when performing the determination measurement of the rising cloud state of the mist, the average calculation is not performed, and the determination is made based on the data over time.

[0111] Next, the effects of the configuration of the present embodiment will be described. In one embodiment of the present invention configured as described above, the mist device 1 includes a mist atmosphere temperature suppression unit 82 that suppresses an increase in the ambient temperature of the mist staying in the retention space 4. Thereby, after raising the ambient temperature of the mist at the initial stage of operation of the mist device 1, it is possible to suppress the ambient temperature of the mist from rising too much. Therefore, even if the ambient temperature of the mist is raised relatively early at the initial stage of operation of the mist device 1, it is possible to suppress the ambient temperature of the mist from rising too much thereafter, and the comfort of the user during mist bathing can be improved.

[0112] In one embodiment of the present invention configured as described above, the mist atmosphere temperature suppression unit 82 is configured such that the mist outlet temperature after a predetermined time has elapsed is lower than the mist outlet temperature at the outlet of the mist supply unit 10 at the start of mist supply. Thereby, immediately after the start of mist supply, the mist outlet temperature is set relatively high to increase the ambient temperature of the mist, and after a predetermined time has elapsed, the mist outlet temperature is decreased, and it is possible to suppress the ambient temperature of the mist from rising too much.

[0113] In one embodiment of the present invention configured as described above, the mist device control unit 26 has a mist atmosphere temperature suppression mode for controlling the heater so that the mist outlet temperature after a predetermined time has elapsed is lower than the mist outlet temperature at the outlet of the mist supply unit 10 at the start of mist supply, and the heater and the mist device control unit 26 function as the mist atmosphere temperature suppression unit 82. Thereby, by the heater and the mist device control unit 26, immediately after the start of mist supply, the mist outlet temperature is set relatively high to increase the ambient temperature of the mist, and after a predetermined time has elapsed, the mist outlet temperature is decreased, and it is possible to suppress the ambient temperature of the mist from rising too much.

[0114] In one embodiment of the present invention configured as described above, the mist atmosphere temperature suppression unit 82 is configured such that the mist supply flow rate from the mist supply unit 10 after a predetermined time has elapsed is less than the mist supply flow rate from the mist supply unit 10 at the start of mist supply. As a result, immediately after the start of mist supply, the mist supply flow rate is set relatively high to increase the mist density, thereby increasing the mist atmosphere temperature relatively early. After a predetermined time has elapsed, the mist supply flow rate is set low to decrease the mist density, thereby reducing the mist atmosphere temperature and suppressing the mist atmosphere temperature from rising too much.

[0115] In one embodiment of the present invention configured as described above, the mist device control unit 26 includes a mist supply flow rate suppression mode in which the heater is controlled such that the mist supply flow rate after a predetermined time has elapsed is less than the mist supply flow rate from the mist supply unit 10 at the start of mist supply. As a result, immediately after the start of mist supply, the mist supply flow rate is set relatively high to increase the mist density, thereby increasing the mist atmosphere temperature relatively early. After a predetermined time has elapsed, the water temperature in the water storage unit is set to a lower temperature than at the start of mist supply, and the mist supply flow rate is set low to decrease the mist density, thereby reducing the mist atmosphere temperature and suppressing the mist atmosphere temperature from rising too much.

[0116] In one embodiment of the present invention configured as described above, the water supply control unit 25 includes a mist supply flow rate suppression mode in which the water supply unit is controlled such that the mist supply flow rate after a predetermined time has elapsed is less than the mist supply flow rate from the mist supply unit 10 at the start of mist supply. As a result, immediately after the start of mist supply, the mist supply flow rate is set relatively high to increase the mist density, thereby increasing the mist atmosphere temperature relatively early. After a predetermined time has elapsed, the water temperature in the water storage unit is set to a lower temperature than at the start of mist supply, and the mist supply flow rate is set low to decrease the mist density, thereby reducing the mist atmosphere temperature and suppressing the mist atmosphere temperature from rising too much.

[0117] In one embodiment of the present invention configured as described above, the water supply control unit 25 controls the water supply unit to supply water to the mist generation unit 8 even when the mist generation unit 8 is generating mist. Thereby, water can be supplied to the mist generation unit 8 while the mist generation unit 8 generates mist. Thereby, while supplying mist so as to maintain the staying state in the staying space 4, it is possible to suppress an increase in the temperature of the water in the mist generation unit and suppress the ambient temperature of the mist from rising too much.

[0118] Further, one embodiment of the present invention is a mist system, and is characterized by including the mist device 1 of one embodiment of the present invention and a bathtub body 6 that forms a staying space 44 for receiving the mist supplied from the mist supply unit 10 of the mist device 1.

Explanation of reference numerals

[0119] 1: Mist device 2: Mist system 3: Bathroom 4: Staying space 6: Bathtub body 6C: Part 8: Mist generation unit 10: Mist supply unit 12: Water storage unit 18: Ultrasonic vibrator 20: Heater 21: Heater control unit A: User B: Water C: Staying layer R: Rising cloud-like body X: Warm water layer

Claims

1. A mist device used for a bathtub body, comprising a mist generation unit configured to generate heated mist from heated water or to generate heated mist by heating mist generated from water; and a mist supply unit configured to supply the mist generated by the mist generation unit into the bathtub body so as to form a retention space with an open upper portion. The mist is configured to be retained in the retention space. The mist device further comprises a mist atmosphere temperature suppression unit configured to suppress an increase in the ambient temperature of the mist retained in the retention space. The mist atmosphere temperature suppression unit is configured such that the mist outlet temperature after a predetermined time has elapsed is lower than the mist outlet temperature at the outlet of the mist supply unit at the start of mist supply. Mist device.

2. The mist device comprises a heater and a heater control unit configured to control the heater. The heater control unit has a mist atmosphere temperature suppression mode in which the heater is controlled such that the mist outlet temperature after a predetermined time has elapsed is lower than the mist outlet temperature at the outlet of the mist supply unit at the start of mist supply. The mist device according to claim 1.

3. The mist atmosphere temperature suppression unit is configured such that the mist supply flow rate from the mist supply unit after a predetermined time has elapsed is less than the mist supply flow rate from the mist supply unit at the start of mist supply. The mist device according to claim 1.

4. The mist generation unit comprises a water storage unit configured to store water for generating mist, and an ultrasonic vibrator configured to generate mist by irradiating ultrasonic waves onto the water in the water storage unit. The mist device further comprises a heater and a heater control unit configured to control the heater. The heater control unit of the mist device according to claim 3 includes a mist supply flow rate suppression mode for controlling the heater so that the mist supply flow rate after a predetermined time has elapsed is less than the mist supply flow rate from the mist supply unit at the start of mist supply.

5. The mist generation unit further includes a water supply unit that supplies water at a temperature lower than the temperature of the water in the mist generation unit to the mist generation unit, and a water supply control unit that controls the water supply unit. The water supply control unit of the mist device according to claim 3 includes a mist supply flow rate suppression mode for controlling the water supply unit so that the mist supply flow rate after a predetermined time has elapsed is less than the mist supply flow rate from the mist supply unit at the start of mist supply.

6. The water supply control unit of the mist device according to claim 5 controls the water supply unit to supply water to the mist generation unit even when mist is being generated in the mist generation unit.

7. A mist system, the mist device according to any one of claims 1 to 6, and a bathtub body that forms the retention space for receiving the mist supplied from the mist supply unit of the mist device.

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