Fog device and fog system provided with the same

Abstract

The present application relates to a mist device and a mist system provided with the mist device. The present application provides a mist device capable of cooling the vicinity of a user's face and improving the comfort of a user during a mist bath. The mist device (1) of the present application is provided with: a mist generating section (8) that generates mist; and a mist supply section (10) that supplies the mist generated by the mist generating section into a bathtub main body (6) in which a retention space that is open upward is formed, and after the mist supplied from the mist supply section forms a rising cloud shape in such a manner that the mist rises to a position higher than an overflow section of the bathtub main body, the supplied mist forms a retention layer (C) of mist in the retention space (4) of the bathtub main body.

Description

TECHNICAL FIELD

[0001] The present application relates to a mist device, and particularly to a mist device for a bathtub main body. BACKGROUND

[0002] In the past, a bathtub sauna device for performing a sauna bath as shown in Patent Document 1 has been known, and such a bathtub sauna device is provided with a bathtub cover provided at an upper portion of a bathtub main body in order to form a sauna space in which mist is used.

[0003] PRIOR ART DOCUMENTS

[0004] PATENT DOCUMENTS

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2008-018130

[0006] However, in the bathtub sauna device as shown in Patent Document 1, since the bathtub cover is required in order to form the sauna space, there are problems in that the position of the user is restricted, the comfort is impaired, and the convenience of the user is lacking.

[0007] In view of the above, the present inventors have intensively studied a method of omitting the bathtub cover and allowing the mist to remain in the bathtub main body which is open upward.

[0008] However, in the case where the bathtub cover is to be omitted and the mist is to be allowed to remain in the bathtub main body, the remaining mist is likely to excessively warm the face of the user seated in the bathtub main body. SUMMARY

[0009] Therefore, the present application has been achieved in order to solve the problems of the prior art described above, and has an object to provide a mist device which can cool the vicinity of the face of the user and can improve the comfort of the user during a mist bath.

[0010] In order to solve the above problems, one embodiment of the present application is a mist device for a bathtub main body, characterized by comprising: a mist generating portion which generates mist; and a mist supplying portion which supplies the mist generated by the mist generating portion into the bathtub main body in which a remaining space which is open upward is formed, wherein the mist supplied from the mist supplying portion forms a remaining layer of the mist in the remaining space of the bathtub main body after the mist supplied from the mist supplying portion forms a rising cloud shape of the mist which rises to a position higher than an overflow portion of the bathtub main body.

[0011] In one embodiment of the present application thus configured, the mist supplied from the mist supply section forms a rising cloud of mist in such a manner that the mist rises to a position higher than the overflow section of the bathtub main body, and therefore the rising cloud of mist is formed to a height of the face of a user who sits in the bathtub main body and uses the mist generating device. Thus, the face of the user can be cooled by the heat of vaporization of a portion of the mist of the rising cloud of mist, and the body can be warmed by the mist bath using the stagnation layer of the mist. Therefore, the comfort of the user during the mist bath can be improved.

[0012] In one embodiment of the present application, it is preferable that the mist device be configured to form a rising cloud of mist from the mist supplied from the mist supply section using the upward rising airflow from inside the bathtub main body to a position higher than the overflow section of the bathtub main body.

[0013] In one embodiment of the present application thus configured, the mist device is configured to form a rising cloud of mist from the mist supplied from the mist supply section using the upward rising airflow from inside the bathtub main body to a position higher than the overflow section of the bathtub main body. Thus, the rising cloud of mist can be formed in such a manner that the mist rises from the bathtub main body.

[0014] In one embodiment of the present application, it is preferable that the mist device be configured to form the upward rising airflow from inside the bathtub main body by the temperature difference between the temperature of the water stored in the bathtub main body and the temperature of the bathroom in which the bathtub main body is used before the supply of the mist is started.

[0015] In one embodiment of the present application thus configured, the mist device forms the upward rising airflow from inside the bathtub main body by the temperature difference between the temperature of the water stored in the bathtub main body and the temperature of the bathroom in which the bathtub main body is used before the supply of the mist is started. Thus, the rising cloud of mist can be formed in such a manner that the mist rises from the bathtub main body without a structure for forming the rising cloud of mist being physically configured in the bathtub main body 6.

[0016] In one embodiment of the present application, it is preferable that the mist device be configured to cause a portion of the mist in the stagnation space to rise to a position higher than the overflow section of the water of the bathtub main body after the supplied mist forms a stagnation layer of mist in the stagnation space of the bathtub main body.

[0017] In one embodiment of the present application thus configured, the mist device is configured to cause a portion of the mist in the retention space to rise to a position higher than the overflow portion of the bathtub main body after the supplied mist forms a retention layer of mist in the retention space of the bathtub main body. Thus, a portion of the mist in the retention space after the retention layer is formed rises to a position higher than the overflow portion and is vaporized, the user's face can be cooled using the heat of vaporization, and the body can be warmed using the retention layer of mist as a mist bath. Therefore, the user's comfort during the mist bath can be further improved.

[0018] In one embodiment of the present application, it is preferable that the mist device be configured to cause the mist in the bathtub main body to generate an upward rising airflow by a temperature difference between the ambient temperature of the mist in the bathtub main body supplied from the mist supply portion and the temperature of the bathroom in which the bathtub main body is used in a state in which the retention layer of mist is formed.

[0019] In one embodiment of the present application thus configured, the mist device is configured to cause a portion of the mist in the retention space to rise to a position higher than the overflow portion of the bathtub main body after the supplied mist forms a retention layer of mist in the retention space of the bathtub main body. Thus, a portion of the mist in the retention space after the retention layer is formed rises to a position higher than the overflow portion and is vaporized, the user's face can be cooled using the heat of vaporization, and the body can be warmed using the retention layer of mist as a mist bath. Therefore, the user's comfort during the mist bath can be further improved.

[0020] In one embodiment of the present application, it is preferable that the mist device also supply mist from the bathtub main body to the floor of the bathroom in which the bathtub main body is disposed after the retention layer of mist is formed in the retention space of the bathtub main body.

[0021] In one embodiment of the present application thus configured, the mist device can also supply mist from the bathtub main body to the floor of the bathroom in which the bathtub main body is disposed after the retention layer of mist is formed. Thus, the mist can also be vaporized from the floor of the bathroom, and the space in the bathroom can be more effectively cooled using the heat of vaporization. Therefore, the user's face exposed from the bathtub main body can be further cooled, and the body can be warmed using the retention layer of mist as a mist bath. Thus, the user's comfort during the mist bath can be further improved.

[0022] In one embodiment of the present application, it is preferable that the retention boundary surface of the upper side of the retention layer of mist be formed at a position higher than the overflow portion of the bathtub main body.

[0023] In one embodiment of the present application thus configured, a retention boundary surface of the retention layer of the mist is formed at a position higher than the overflow portion of the bathtub main body. Thereby, the user's body can be warmed as a mist bath up to the retention boundary surface of the mist at a position higher than the overflow portion of the bathtub main body when the mist is retained. Also, the mist can be supplied to the floor of the bathroom.

[0024] In one embodiment of the present application, it is preferable that the lower end of the mist supply portion be disposed at a position higher than the overflow portion of the bathtub main body.

[0025] In one embodiment of the present application thus configured, the lower end of the mist supply portion is disposed at a position higher than the overflow portion of the bathtub main body. Thereby, compared to a case where the lower end of the mist supply portion is disposed at a position lower than the overflow portion, the retention boundary surface can be easily formed at a position higher than the overflow portion with a small flow rate of the mist.

[0026] In one embodiment of the present application, it is preferable that the mist system include the mist device of one embodiment of the present application, and the bathtub main body in which the retention space that receives the mist supplied from the mist supply portion of the mist device is formed.

[0027] In one embodiment of the present application, it is preferable that the inner side wall of the bathtub main body opposite to the mist supply portion be formed to be inclined outward toward the upper side.

[0028] In one embodiment of the present application thus configured, the inner side wall of the bathtub main body opposite to the mist supply portion is formed to be inclined outward toward the upper side. Thereby, the mist supplied from the mist supply portion can easily rise along the inner side wall to a position higher than the overflow portion of the bathtub main body, and a rising cloud of the mist can be easily formed.

[0029] In one embodiment of the present application, it is preferable that the mist supply portion of the mist device be disposed on the short side of the bathtub main body.

[0030] In one embodiment of the present application thus configured, the mist supply portion of the mist device is disposed on the short side of the bathtub main body. Thereby, the mist supply portion can supply the mist toward the long side of the bathtub main body, and the mist can easily float above the bathtub main body even if the mist rises toward the upper side of the bathtub main body. In contrast, in a case where the mist supply portion is disposed on the long side of the bathtub main body, the rising mist easily goes toward the bathing place outside the bathtub main body.

[0031] Effects of the Invention

[0032] According to the mist device of the present application, the face of the user can be cooled, and the comfort of the user during the mist bath can be improved. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 Fig. 1 is a schematic perspective view of a mist system provided with a mist device of one embodiment of the present application.

[0034] Figure 2 Fig. 2 is a schematic configuration view of the mist system provided with the mist device of one embodiment of the present application.

[0035] Figure 3 Fig. 3 is a schematic cross-sectional view of the mist system provided with the mist device of one embodiment of the present application, taken along the longitudinal direction of the bathtub main body.

[0036] Figure 4 Fig. 4 is a schematic configuration view showing the internal configuration of the mist device of one embodiment of the present application.

[0037] Figure 5 Fig. 5 is a block diagram showing the internal configuration of the mist device of one embodiment of the present application.

[0038] Figure 6 Fig. 6 is a view for explaining the mist supply operation from the mist device of one embodiment of the present application.

[0039] Figure 7 Fig. 7 is a view for explaining the mist supply operation from the mist device of one embodiment of the present application.

[0040] Figure 8 Fig. 8 is a view for explaining the mist supply operation from the mist device of one embodiment of the present application.

[0041] Figure 9 Fig. 9 is a view for explaining the mist supply operation from the mist device of one embodiment of the present application.

[0042] Figure 10 Fig. 10 is a view for explaining the mist supply operation from the mist device of one embodiment of the present application.

[0043] Figure 11 Fig. 11 is a view for explaining the mist supply operation from the mist device of one embodiment of the present application.

[0044] Figure 12 Fig. 12 is a view showing the condition for determining whether a stagnation state is formed in the stagnation space in the mist system provided with the mist device of one embodiment of the present application.

[0045] Figure 13 Fig. 13 is a view showing the condition for determining whether a stagnation state is formed in the stagnation space in the mist system provided with the mist device of one embodiment of the present application.

[0046] Figure 14is a diagram for explaining a method of measuring an ambient temperature of mist in a mist system of a mist device according to an embodiment of the present application, a method of measuring a water temperature, and a method of measuring a room temperature in a bathroom.

[0047] Figure 15 is a diagram for explaining a measuring device and a measuring method of a flow rate of mist in a mist system of a mist device according to an embodiment of the present application.

[0048] Figure 16 is a perspective view of a measuring device of a particle diameter of mist in a mist system of a mist device according to an embodiment of the present application.

[0049] Figure 17 is a plan view of a measuring device of a particle diameter of mist supplied from a mist supply portion of a mist device according to an embodiment of the present application.

[0050] Figure 18 is a diagram showing an example of particle diameter distribution data obtained by measuring a particle diameter of mist supplied from a mist supply portion of a mist device according to an embodiment of the present application by a particle diameter distribution measuring device.

[0051] Figure 19 is a diagram showing a measuring device of a transmittance for determining whether or not mist supplied from a mist supply portion of a mist device according to an embodiment of the present application is retained in a bathtub main body.

[0052] BRIEF DESCRIPTION OF DRAWINGS

[0053] 1: mist device; 2: mist system; 3: bathroom; 4: retention space; 6: bathtub main body; 6b: surface; 8: mist generating portion; 10: mist supply portion; 66: retention boundary surface; A: user; B: water; C: retention layer; R: rising cloud; X: warm water layer. DETAILED DESCRIPTION

[0054] Hereinafter, embodiments of the present application disclosed in the present specification will be explained in detail with reference to the drawings. According to the following explanation, many modifications and other embodiments of the present application will be apparent to those skilled in the art. Therefore, the following explanation should not be taken in a limiting sense for the scope of the present application, but is included as a description of the best mode contemplated at this time for carrying out the present application. Substantial changes and modifications which are apparent to those skilled in the art are enabled without departing from the spirit of the present application.

[0055] Hereinafter, a mist system of a mist device according to an embodiment of the present application will be explained with reference to the drawings.

[0056] Figure 1 is a perspective view of a mist system of a mist device according to an embodiment of the present application, Figure 2is a schematic configuration view of a mist system of a mist device according to an embodiment of the present application, Figure 3 is a schematic cross-sectional view of a mist system of a mist device according to an embodiment of the present application, taken along a long side direction of a bathtub main body.

[0057] As Figure 1 and Figure 2 shown, a mist system 2 of a mist device 1 according to an embodiment of the present application is provided in a bathroom 3. The mist system 2 is a water receiving apparatus having a water receiving portion that receives water discharged. Further, the mist system 2 functions as a so-called water using apparatus that is used as an apparatus for a place where water is used.

[0058] The mist device 1 is used for a bathtub main body 6. The bathroom 3 is a space of a box type, and has an indoor space 5 that is formed to be a certain degree of airtight for use of water inside. The water also includes water that is higher in temperature than the temperature of the outside air (normal temperature), and heated water (so-called hot water). The mist system 2 has the bathtub main body 6 formed with a retention space 4 that receives mist supplied from a mist supply portion of the mist device 1 described later. The mist system 2 is provided with a supply apparatus 7 that supplies water. The mist system 2 is configured to form, as described later, a warm water layer X (refer to Figure 2 ) that is warmed up to be higher in temperature than the room temperature, and a retention layer C of mist formed by the mist warmed up in the retention space 4 above the warm water layer, in the bathtub main body 6. The bathroom 3 can also have a toilet, a hand washing apparatus, a washstand, or a combination of these, and is not limited to a room provided only with the bathtub main body 6.

[0059] The bathtub main body 6 is formed with the retention space 4 that is open to the indoor space 5 of the bathtub main body 6 in which the mist system 2 is provided, in an upward direction. The bathtub main body 6 is a bathtub that can retain water in the retention space 4 inside. The bathtub main body 6 is formed in a rectangular shape in plan view, and has a long side portion 6d formed on a long side of the rectangular shape, and a short side portion 6e formed on a short side of the rectangular shape. The bathtub has a smaller width on the short side portion 6e than on the long side portion 6d. A short side side wall 6f (refer to Figure 3 ) of the bathtub main body 6 that opposes the mist supply portion 10 is formed to be inclined outward in an upward direction. The bathtub main body 6 has a volume in the range of 200 L to 500 L, for example. For example, the bathtub main body 6 has a volume of 300 L, and 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 (for example, 300 L in the case where water is not retained).

[0060] The retention space 4 is a space formed in a substantially rectangular solid shape inside the bathtub main body 6. As Figure 3 shown, when a user A takes a bath, water B of 34°C to 45°C (a warm water layer X is formed) is retained on a lower side of the retention space 4, and the user A can take a bath in a sitting state. Note that, as described later, the water B is supplied from the supply apparatus 7 to the retention space 4, and the water B is warmed up by the mist supplied from the mist supply portion 10. Figure 3In the present embodiment, the mist is retained above the water B in the retention space 4 (a state in which a retention layer C of the mist is formed). The retention space 4 is formed to the upper end portion 6a of the bathtub main body 6 and is open on the top surface side. The bathtub main body 6 retains the mist in the retention space 4 in a state in which a cover like a top surface of the retention space 4 is omitted, as described later. Note that the mist can be retained in the retention space 4 without the water B being retained therein. The shape of the bathtub main body 6 is not limited to a box shape like the embodiment, but can be any shape that allows the retention space to be formed. For example, the bathtub main body 6 can be formed in a circular or elliptical shape in plan view and can have a basin-shaped retention space formed on the inside. The bottom surface of the bathtub main body 6 can be formed so as to be inclined so that the user can adopt a posture close to a reclining showering posture or a sitting posture, or can have a step portion formed on the bottom surface or can not have a step portion formed on the bottom surface. The top edge portion of the wall portion of the bathtub main body 6 need not be formed horizontally at a certain height, but can be formed so as to vary in height. For example, the top edge portion of the wall portion of the bathtub main body 6 can be formed in a shape that extends obliquely upward or obliquely downward in side view, a shape in which a portion thereof extends in an arc shape with a portion thereof depressed downward, or a shape in which a concave-convex shape like a substantially right angle is formed. The mist system 2 is configured to retain the mist supplied from the mist supply portion in the retention space 4.

[0061] The supply device 7 is a supply device that supplies water to the bathtub main body 6, a faucet device on the bathing place side, or the like. The supply device 7 is, for example, a supply hot water machine that can supply water supplied from a supply source such as a tap water pipe and water that is not warmed, and heated water (so-called hot water). The supply device 7 is connected to a water supply port 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 supply port 6g. The supply device 7 is also connected to the mist device 1 via the water supply path 14, and can also supply water to the mist device 1. Note that the mist device 1 can also be directly connected to a water supply source such as a tap water pipe without passing through the supply device 7. Further, both the supply device 7 and the water supply source can be connected to the mist device 1. Water is supplied to the supply device 7 from a water supply source such as a tap water pipe. The supply device 7 is electrically connected to the water supply control section 25. The supply device 7 of the present embodiment has a function as a reheating device, which is a function of heating water that has been taken into the bathtub main body 6 from the water supply port 6g that is a water taking port, inside, and returning the water to the bathtub main body 6. The reheating device reheats water that has been stored in the bathtub main body 6. Note that the supply device 7 can also not have the function as a reheating device. Note that although the supply device 7 supplies water into the bathtub main body 6 from the water supply port 6g, as a modification, the supply device 7 can be connected to a faucet device provided to the bathtub main body 6 for supplying water to the bathtub main body, and can supply water into the bathtub main body 6 from the faucet device. Note that the faucet device for supplying water to the bathtub main body 6 can also be directly connected to a water supply source without passing through the supply device 7. Further, both the supply device 7 and the water supply source can be connected to the faucet device.

[0062] Next, the mist device of the above-described one embodiment of the present application is described in more detail. Figures 1 to 5

[0063] The mist system 2 has the mist device 1. As shown in FIG. 1, the mist device 1 has a mist generating section 8 that generates mist from stored water, a mist supply section 10 that supplies the mist into the bathtub main body 6, a bathroom air conditioner 80 (refer to FIG. 2) that can send warm air and cold air so as to adjust the room temperature in the bathroom 3, a heater 20, a heater control section that controls the heater 20, a mist device operation section 28 that receives an operation input from a user, and a mist device control section 26 that controls the generation of mist in the mist generating section 8 and the supply of mist from the mist supply section 10. The mist device 1 is formed so that the mist generating section 8 is provided in a horizontally long box-shaped housing 9 (refer to FIG. 2), and the mist supply section 10 connected to the mist generating section 8 extends downward from the front side of the housing 9. Figure 3 Figure 1 Figure 4

[0064] ​​​​The mist generating portion 8 generates warmed mist from heated water or generates warmed mist by heating mist generated from water. Thus, the mist generating portion 8 generates mist that is warmer than the room temperature in the bathroom. Thus, the warmed mist also includes mist that is warmed after the mist is generated. The mist generating portion 8 is installed above the short side portion 6e of the short side side of the bathtub main body 6 to the wall W.

[0065] As shown in Figure 5 , the mist generating portion 8 includes a water storage portion 12 that stores water inside, a water supply path 14 that supplies water from a water supply source to the water storage portion 12, a water discharge path 16 that discharges water from the water storage portion 12 to a drain, an ultrasonic vibrator 18 provided to the bottom of the inside of the water storage portion 12, a water temperature measurer 22 provided to the inside of the water storage portion 12 as a water temperature sensing unit, an indoor temperature measurer 24 (see Figure 3 ) provided to the outside of the water storage portion 12 as an air temperature sensing unit, a float switch 29 that sends a water supply stop signal when a float rises to a water supply prescribed water level on a shaft portion due to the rise of the water level of water in the water storage portion 12, and an overflow pipe 31 that discharges water from an upper end opening portion of the overflow pipe 31 to the drain side when the water level of water in the water storage portion 12 exceeds the water supply prescribed water level Q1 and further rises, and the water overflows the height position of the upper end opening portion of the overflow pipe 31.

[0066] The water storage portion 12 is formed as a water storage space inside the mist generating portion 8 in a rectangular parallelepiped shape. The water supply path 14 is connected to the upper portion of the water storage portion 12, and the water discharge path 16 is connected to the lower portion of the water storage portion 12. The mist supply portion 10 is connected to the side wall near the center of the water storage portion 12. The water supply path electromagnetic valve 30 that opens and closes the water supply path 14 is provided to the water supply path 14. The water supply path 14 is connected to the supply device 7. The water supply path electromagnetic valve 30 has a function of supplying water at a temperature lower than the temperature of water in the mist generating portion 8 to the mist generating portion 8 as a water supply portion. Note that the supply device 7 supplies water at a temperature (for example, about 38°C) lower than the temperature of water (for example, about 60°C) in the mist generating portion 8 to the mist generating portion 8. The water discharge path electromagnetic valve 32 that opens and closes the water discharge path 16 is provided to the water discharge path 16. Further, the water discharge pump 33 for discharging water from the water storage portion 12 is provided to the water discharge path 16. Further, the overflow pipe 31 is provided to the water supply side portion 12a in the water storage portion 12. The upper end of the overflow pipe 31 is disposed at a position slightly above the water supply prescribed water level Q1 so as not to overflow water in the water storage portion 12. The drain valve 41 that drains water leakage due to a failure or the like is provided to the lower portion of the water storage portion 12.

[0067] The ultrasonic vibrator 18 can oscillate ultrasonic waves in the water in the water storage portion 12, vibrate the water at the liquid surface, separate the water into fine particles from the water column generated at the liquid surface, and generate mist (water mist) of a predetermined particle diameter. The ultrasonic vibrator 18 is electrically connected to the mist device control portion 26, and can change the particle diameter of the generated mist by adjusting the oscillation output, frequency, and the like of the ultrasonic waves of the ultrasonic vibrator 18. The ultrasonic vibrator 18 generates mist of which Sauter mean diameter is 3.1 μm or more and 10 μm or less by a predetermined oscillation output. The ultrasonic vibrator 18 can also be changed to other devices that generate mist of a predetermined particle diameter, such as a mist device realized by steam, a mist device realized by pressure spraying, a mist device realized by arc discharge, and the like. Further, in the present embodiment, a plurality of ultrasonic vibrators 18 are arranged in the water storage portion 12. The ultrasonic vibrator 18 is connected to an oscillator 19 (refer to Figure 4 ) that drives the ultrasonic vibrator 18 in the housing of the mist device 1.

[0068] The heater 20 is provided at the bottom of the water inside the water storage portion 12 in the mist generating portion 8. The heater 20 is configured to heat the water in the water storage portion 12. The heater 20 can be provided in the air in the water storage portion 12, in the mist supply portion 10, and is not limited to the water storage portion 12 in the mist generating portion 8. Therefore, the heater 20 can also be configured to heat the mist or the air in the water storage portion 12. For example, the heater 20 can heat the water supplied from the supply device 7 (for example, water warmed to about 40°C) to 60°C or more.

[0069] The water temperature measurer 22 senses the water temperature of the water in the water storage portion 12. The mist device control portion 26 is electrically connected to the water temperature measurer 22, and the mist device control portion 26 can recognize the water temperature of the water in the water storage portion 12. The water temperature measurer 22 is, for example, a thermistor. The indoor temperature measurer 24 senses the temperature of the air outside the water storage portion 12 of the indoor space 5 in which the bathtub main body 6 is disposed. The mist device control portion 26 is electrically connected to the indoor temperature measurer 24, and the mist device control portion 26 can recognize the temperature of the air of the indoor space 5. Note that since it is assumed that the temperature of the air of the indoor space 5 and the temperature of the air in the stagnation space 4 are approximately equal or relatively close in the state before the start of the supply of the mist (before the mist generating portion 8 is driven), the mist device control portion 26 can estimate the temperature of the air in the stagnation space 4 from the temperature of the air of the indoor space 5 measured by the indoor temperature measurer 24.

[0070] The float switch 29 has a float that can move up and down in conjunction with the water level.

[0071] The float switch 29 can sense the supply water level Q1 at which the water level reaches the upper end of the float. In addition, the float switch 29 can also sense the lower end water level at which the water level reaches the lower end of the float. Such sensing of the supply water level and sensing of the lower end water level can be performed by different floats. The float switch 29 is electrically connected to the mist device control section 26.

[0072] The mist supply section 10 supplies the mist generated by the mist generating section 8 into the bathtub main body 6, which serves as a retention section, and forms the retention space 4 that is open to the room above in which the bathtub main body 6 is disposed. The mist supply section 10 is disposed above the short side portion 6e on the short side of the bathtub main body 6. The mist supply section is disposed at a position higher than the overflow portion of the water in the bathtub main body. As shown in the cross section of the flow path shown in FIG. 6, the mist supply section 10 has a mist supply flow path 11 that extends in the lateral direction from the mist generating section 8 to the upper portion of one end of the retention space 4, and a mist supply port section 13 that is connected to the downstream end of the mist supply flow path 11 as an outlet and is open downward. The mist supply flow path 11 forms a flow path (e.g., flow path cross section) that is long in the lateral direction as viewed from the front (from the retention space 4 side). The mist supply port section 13 extends downward from the downstream end of the mist supply flow path 11. The mist supply port section 13 forms a flow path that is a pipe shape extending toward the lower side. The mist supply port section 13 forms an opening portion that is open downward. The mist supply port section 13 forms a flow path (e.g., flow path cross section) that is long in the lateral direction as viewed from the front of the opening portion thereof (as viewed from above in the case of viewing the upper side from below the mist supply port section 13). The lower end 13a of the mist supply port section 13 is disposed at a position higher than the overflow surface 6b of the water in the bathtub main body 6. Thus, the flow of the water in the bathtub main body 6 as sewage can be suppressed from intruding from the mist supply port section 13 toward the upstream side. As a modification, the overflow surface 6b can be an overflow port provided in the bathtub main body 6. Figure 3

[0073] The mist supply section 10 can supply, for example, the mist at a supply amount per unit time in the range of 0.03 mL / min L to 1.5 mL / min L. The mist supply section 10 can supply, for example, the mist at a supply amount per unit time of 11 mL / min to the retention space 4 of the bathtub main body 6 having a volume of 330 L. In addition, for example, the mist supply section 10 can supply the mist at a supply amount per unit time of 6 mL / min to the retention space 4 of other water receiving equipment or the like having a volume of 4.32 L.

[0074] ​The mist device 1 of the mist system 2 supplies the mist into the retention space 4 to form the retention state in the retention space 4. The mist device 1 is configured to retain the mist supplied from the mist supply part 10 in the retention space 4 of the bathtub main body 6. Further, the mist device 1 is configured to form the rising cloud of the mist having the density state close to the retention state by rising to the position higher than the overflow part of the bathtub main body 6 while the mist supplied from the mist supply part 10 rises to the position by the force of the upward rising airflow from the bathtub main body 6, and then the supplied mist forms the retention layer C of the mist in the retention space 4 of the bathtub main body 6. The retention layer C does not need to be a complete layer, but only needs to exist at a certain height so that the cloud of the mist forms a layer. The mist device 1 supplies the mist that can return to the retention state while rising to the extent of forming the rising cloud of the mist R.

[0075] The bathroom air conditioner 80 can send the warm air having a temperature higher than the temperature in the space where the bathtub main body 6 is provided, the cool air having a temperature lower than the temperature in the space, and the air having 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 rising airflow from the bathtub main body 6 by the temperature difference between the temperature of the water stored in the bathtub main body 6 and the temperature of the bathroom where the bathtub main body 6 is used before the supply of the mist is started. The temperature of the warm air is measured at the air outlet of the bathroom air conditioner 80. Note that the mist device 1 can form the upward rising airflow without operating the bathroom air conditioner 80 in the case where the temperature in the bathroom is an appropriate temperature. That is, the mist system 2 can not necessarily include the bathroom air conditioner 80.

[0076] The water supply control part 25 controls the supply of the water to the bathtub main body 6 and the faucet device on the bathing place side. The water supply control part 25 includes a CPU (central processing unit) and a memory or the like, and controls the connected devices in a manner of performing the supply of the water, the predetermined mode described later, and the like based on a predetermined control program recorded in the memory or the like. The water supply control part 25 is electrically connected to the supply device 7, the operation part 27, the mist device control part 26, the bathroom air conditioner 80, and the like. The electrical connection thereof can be performed by wireless communication or the like. The electrical connection of the water supply control part 25 and the mist device control part 26 and / or the operation part 27 and the like can be performed by wireless communication or the like. For example, the water supply control part 25 and the mist device control part 26 and / or the operation part 27 and the like can be controlled by wireless communication.

[0077] The water supply control section 25 can act independently of the operation of the mist device 1 to supply water to the bathtub main body 6. Note that the water supply control section 25 can also act in association with the operation of the mist device 1 by cooperating with the mist device control section 26. The water supply control section 25 and the mist device control section 26 communicate with each other to function as one control section. In this way, the water supply control section 25 and the mist device control section 26 are described in the present embodiment as separate control sections, but can be a control section in a form in which they are combined or can exist as different control sections that are further subdivided and the like.

[0078] The operation section 27 includes a bathroom operation section 27a provided on a wall surface around the bathtub main body 6 in the bathroom and a bathroom-outside operation section 27b further provided on a wall surface outside the bathroom. The bathroom-outside operation section 27b is provided, for example, in a kitchen, a hallway, or the like. The operation section 27 can be constituted by an operation section that can be remotely operated by wireless communication or the like. For example, the operation section 27 can be constituted by a user's smartphone or the like by using a prescribed program.

[0079] The mist device operation section 28 transmits a user's operation input to the mist device control section 26. The mist device operation section 28 includes a bathroom operation section 28a provided on a wall surface around the bathtub main body 6 in the bathroom and a bathroom-outside operation section 28b further provided on a wall surface outside the bathroom. The bathroom-outside operation section 28b is provided, for example, in a room in front of the bathroom, a hallway, or the like. The mist device operation section 28 can be constituted by an operation section that can be remotely operated by wireless communication or the like. For example, the mist device operation section 28 can be constituted by a user's smartphone or the like by using a prescribed program and connected to the mist device control section 26 via the Internet. The mist device operation section 28 can also perform water storage operation to the mist system 2 in the case of supplying mist, temperature setting of water, and the like. The mist device operation section 28 can also have an operation function to set the temperature of supplied mist, an operation function to set the particle diameter of supplied mist, and the like.

[0080] The mist device control section 26 is built-in with a CPU and a memory or the like to control the connected devices in a manner to generate mist, a prescribed mode described later, and the like based on a prescribed control program recorded in the memory or the like. The mist device control section 26 is electrically connected to the ultrasonic vibrator 18, the heater 20, the water temperature measurer 22, the indoor temperature measurer 24, the mist device operation section 28, the bathroom air conditioner 80, and the like. Also, the mist device control section 26 is electrically connected to the water supply line electromagnetic valve 30 provided in the water supply line 14 and the drain line electromagnetic valve 32 provided in the drain line, so as to be able to control them.

[0081] The fog device control unit 26 has the function of controlling the fog generating unit as a control unit. The fog device control unit 26 has a fog generating mode 26a for generating fog by the fog generating unit 8. The fog device control unit 26 can execute the fog generating mode by a program stored in the storage device. The fog generating mode does not need to be a mode that performs all the operations of the fog generating unit 8 disclosed in this embodiment, but only a mode that performs at least the operation that causes fog to be generated.

[0082] Next, through Figure 3 , Figures 6 to 11 The operation of the fogging device according to one embodiment of the present invention will be described below.

[0083] like Figure 3 As shown, in the standby state before the misting device 1 starts operating, water at approximately 38°C is stored in the lower half of the retention space 4 of the bathtub body 6. The air temperature in the indoor space 5 of the bathroom 3 is approximately equal to the air temperature in the retention space 4. The water supply solenoid valve 30 and the drain solenoid valve 32 are closed. The water storage section 12 is empty. The ultrasonic transducer 18 and the heater 20 are stopped.

[0084] The user operates the mist device control unit 28 to begin controlling the mist supply of the mist device 1. Before the mist supply begins, the indoor temperature measuring device 24 measures the temperature of the air in the indoor space 5, and the mist device control unit 26 identifies the temperature of the air in the indoor space 5. The mist device control unit 26 opens the water supply solenoid valve 30, supplying water from the water supply line 14 into the water storage unit 12. The drain line solenoid valve 32 remains closed. When a predetermined amount of water is stored in the water storage unit 12, the water supply solenoid valve 30 is closed. Next, the mist device control unit 26 activates the heater 20, heating the water from the temperature of the supplied water to above 60°C. After the water is heated to above 60°C, the mist device control unit 26 adjusts the mist temperature to supply mist at the specified temperature. Next, the mist device control unit 26 executes the mist generation mode, activating the ultrasonic transducer 18 to generate mist in the water storage unit 12.

[0085] exist Figure 6 The image shows the state immediately after the fog supply from the fog supply unit 10 to the retention space 4 has just begun.

[0086] The mist generated in the water storage section 12 is supplied from the mist supply section 10 to the retention space 4 within the bathtub body 6. As indicated by arrow F1, the mist is supplied from the mist supply section 10 while falling freely due to its own weight into the retention space 4. In this way, the movement speed of the mist in any direction other than downward movement is suppressed. Therefore, the mist is designed to be less prone to stirring, diffusion, rising, or other movements within the retention space 4.

[0087] existFigure 7 The image shows the state approximately several seconds after the start of fog supply. Fog supply from fog supply unit 10 to retention space 4 continues. The supplied fog initially remains above the water surface of water B and in the lower portion of retention space 4. The force required to lift the fog via an updraft does not exceed the weight of the fog supplied from fog supply unit 10, thus the fog easily remains in retention space 4. Therefore, the fog remains in the lower portion of retention space 4. Fog is gradually supplied and replenished from fog supply unit 10, gradually advancing from the fog supply unit 10 side towards the opposite short side above the water surface or bottom of retention space 4.

[0088] exist Figure 8 In the middle, it shows the fog from Figure 7 The state has reached the state of the short side opposite to the main body of the bathtub 6. The supply of mist from the mist supply section 10 to the retention space 4 is continuing.

[0089] like Figure 9 As shown, the short side opposite to the bathtub body 6 is where the mist reaches. Figure 8 From the state of [unclear], the rising cloud-like body R of fog is formed in such a way that it rises to a position above the overflow surface 6b of the bathtub body 6. The fog supplied from the fog supply section 10 rises along the short side wall 6f of the short side portion 6e on the opposite side of the fog supply section 10, exceeds the overflow surface 6b as the upper edge, and rises further. A collection of fog of a predetermined density (rising cloud-like body R) is formed to a position above the overflow surface 6b. In the rising cloud-like body R, the fog has a concentration of a certain amount or more in the air. A laser device and a transmittance measuring device for receiving the laser, which are arranged outside the stagnation space 4 as described below, are arranged at the location where the rising cloud-like body R is formed. Thereby, the transmittance of the rising cloud-like body R is measured. In terms of transmittance, it is preferable to set it to a value at least less than 90%, more preferably to set it to a value in the range of 80% to 5%, and if the transmittance of such a measured value is maintained for more than 1 second, it can be determined that a rising cloud-like body R of a predetermined density has been formed. The rising cloud R has a fog density that is close to that of the retention layer C. A rising cloud R is defined as an aggregate of fog with a certain or higher density that rises to a position above the overflow surface 6b. The rising cloud R is formed continuously with the fog retention layer C, and the rising cloud R extends upwards from the fog retention layer C (the part where the fog is retained).

[0090] From the moment the mist supply begins, the temperature difference between the water temperature stored in the bathtub body 6 and the bathroom temperature before the mist supply begins creates an upward airflow from inside the bathtub body 6. Therefore, the mist easily rises from the moment the supply begins, utilizing the upward airflow, and easily forms a rising cloud-like structure R above the overflow surface 6b, which is formed by the temporary and continuous rise of the mist.

[0091] As Figure 9 shown, after the rising cloud R rises to a position at a height in the range of about 5 cm to about 30 cm above the overflow face 6b, a portion of the mist is suspended and diffused, and, as for the majority of the mist, the force of gravity is greater than the force borne by the mist from the rising air current and the mist gradually descends in a manner returning toward the dead space 4 inside the bathtub main body 6, and another portion of the mist is vaporized and disappears midway through the movement. The rising cloud R that rises to a position above the overflow face 6b absorbs heat from the surroundings due to the vaporization of a portion of the mist, and has the effect of cooling the surroundings. Therefore, if the user's face is in a position close to the short side portion 6e side, the region of the mist can be raised to the vicinity of the user's face, and the effect of cooling the surroundings of the user's face with the heat of vaporization of a portion of the mist in the rising cloud R is obtained. Therefore, the effect of slightly cooling the user's face is obtained. On the other hand, even if a portion of the mist temporarily rises to a position above the overflow face 6b, a flow in which the main flow of the mist continues to rise while diffusing from the bathtub main body 6 is not formed, and a flow in which the mist descends toward the dead space 4 even if it rises to a certain degree is formed, the main flow of the mist is detained in the dead space 4 (mainly in the region below the overflow face 6b), and a detention layer C is formed in the dead space 4. During this period, the supply of mist from the mist supply portion 10 to the dead space 4 also continues.

[0092] As Figure 10 shown, mist is further supplied from the state of Figure 9 to the dead space 4, and the mist that descends from the rising cloud R returns to the dead space 4 and is detained again.

[0093] As Figure 11As shown, when the mist is further supplied, the increased mist gradually stagnates to the high portion within the stagnation space 4. The supply of the mist from the mist supply portion 10 to the stagnation space 4 is continuing. The mist supplied within the stagnation space 4 is further increased, and the mist stagnates to the portion within the stagnation space 4 close to the top (the upper end portion 6a of the bathtub main body 6). The mist mainly stagnates in the area within the stagnation space 4 above the water surface of the water B and below the top within the stagnation space 4. The mist disappears due to falling to the water B and being absorbed, or due to becoming water droplets on the wall surface of the bathtub main body 6 and adhering to the wall surface of the bathtub main body 6, or due to exceeding the edge of the upper end portion 6a of the bathtub main body 6 and spreading. The time until the disappearance varies depending on the particle diameter of the mist. Although the mist disappears or spreads like this, a stagnation layer of the mist can be formed within the stagnation space 4 by supplying new mist before the disappearance or spreading. That is, the mist slowly flows within the stagnation space 4, but does not spread from the stagnation space 4, and a stable stagnation layer C is formed. The stagnation layer C is formed because the mist of a density of a certain level or more exists within a unit space at a position above the water surface of the water B. The stagnation layer C is recognized as a white cloud shape. The stagnation layer C is considered to be the mist filled to the top of the stagnation space 4. The stagnation layer C is distinguished from the mist that spreads from the stagnation space 4 and spreads to the entire room space.

[0094] The stagnation boundary surface 66 of the upper portion side of the stagnated mist is formed at a position lower than the height position Ml, which is the height of the overflow surface 6b of the bathtub main body 6 (height position M0 (refer to Figure 3 )) plus the height corresponding to the depth Ll of the bathtub main body 6. The stagnation boundary surface 66 indicates the boundary region between the stagnation layer C in which the mist is a certain level or more in the air and the air layer J in which the mist is less than a certain level in the air. The stagnation boundary surface 66 is defined as a region slightly having a height in the vertical direction due to the mist stagnating while moving to some extent. Note that the overflow surface 6b, which is the overflow portion of the bathtub main body 6, is the lowest portion in the side wall of the bathtub main body 6, that is, the portion that initially overflows when the water is stored to the upper limit of the bathtub main body 6.

[0095] For example, the retention boundary surface 66 of the upper side of the retained mist is formed at a position higher than the height position M0 of the overflow surface 6b of the overflow portion of the bathtub main body 6. At this time, for example, the retention boundary surface 66 of the upper side of the retained mist can be formed at a position lower than a height position 200 mm above the height (height position M0) of the overflow surface 6b of the bathtub main body 6, or can be formed at a position lower than a height position 100 mm above the height (height position M0) of the overflow surface 6b of the bathtub main body 6, for example. In this way, in the case where the retention boundary surface 66 is at a position higher than the height of the overflow surface 6b of the bathtub main body 6, the user can obtain a mist bath effect up to a position beyond the bathtub, that is, a warm bath effect up to a height higher than the bathtub. During driving (use) of the mist generating portion 8, mist is supplied into the bathtub main body 6, and the retention of the mist continues. The mist device 1 is configured to prescribe the temperature difference between the water temperature in the bathtub main body 6 and the room temperature, the particle diameter of the mist, the supply amount of the mist, and the like, such that the height position of the retention boundary surface 66 becomes the prescribed height position as described above.

[0096] After the supplied mist forms the retained layer C of mist in the retention space 4 of the bathtub main body 6, a part of the mist in the retention space 4 rises to a position higher than the overflow portion 6C of the water of the bathtub main body 6. For example, a part of the retained layer C rises in a bulging manner to rise to a position higher than the overflow portion 6C. That is, in a short time, a small rising cloud-like body R that rises from the retained layer C to a position higher than the overflow portion 6C is formed. As to the determination of whether the rising cloud-like body R is formed or not, the determination can be made by the transmittance, as described later. Thus, a part of the mist in the retention space after the formation of the retained layer C easily rises to a position higher than the overflow portion 6C, the mist rises and is vaporized, the face of the user can be cooled by the heat of the vaporization, and the body can be warmed by the retained layer of mist as a mist bath.

[0097] Further, as Figure 11 indicated, after the retained layer C of mist is formed in the retention space 4 of the bathtub main body 6, the supply of mist from the mist supply portion 10 to the bathtub main body 6 is continued, whereby mist that has not entered the retention space 4 can also overflow, and the mist can be supplied to the floor side beside the bathtub main body 6. Thus, the mist can also be vaporized from the floor in the bathroom, and the space in the bathroom can be more effectively cooled by the heat of the vaporization. Therefore, the face of the user that protrudes from the bathtub main body 6 can be further cooled, and the body can be warmed by the retained layer C of mist as a mist bath. In the case where the user ends the use of the mist device 1, the user operates the mist device operation portion 28 to end the execution of the mist generation mode of the mist device control portion 26.

[0098] As Figure 11 indicated, the mist supplied by the mist device 1 of the mist system 2 can form a retained state in the retention space 4. The mechanism is described.

[0099] As a basic mechanism, the force to make the mist rise by the updraft generated by the temperature difference ΔT between the water temperature in the bathtub body 6 and the room temperature of the bathroom is made not to exceed the weight of the mist supplied from the mist supply part 10, thereby the mist is retained in the retention space 4. That is, the mist forms a retention state because the weight of the mist is larger than the force to make the mist rise. Therefore, the mist device 1 of the mist system 2 supplies the mist satisfying such a condition, thereby it is easy to form the retention state of the mist in the retention space 4. The updraft is generated by the temperature difference ΔT between the water temperature in the bathtub body 6 and the room temperature of the bathroom, but it is also generated by the temperature difference between the temperature of the mist (the ambient temperature of the mist) and the room temperature of the bathroom in the state where the retention layer of the mist is formed. Further, the particle diameter of the mist and the density of the mist affect the weight of the mist. When the supply amount of the mist becomes larger, the weight of the collection of the mist becomes heavier in a manner that the density of the mist becomes higher and / or the particle diameter of the mist becomes larger as the mist combines with each other. Therefore, when the supply amount of the mist becomes larger, the mist easily forms the retention state. On the other hand, when the supply amount of the mist becomes smaller, the mist hardly forms the retention state. Further, when the particle diameter of the supplied mist becomes larger, the mist easily forms the retention state. Further, in order to form the retention state of the mist in the retention space 4, the larger the retention space 4 is, the more the supply amount of the mist is required. In the case where the retention space 4 is small, in terms of the supply amount of the mist, it is easy to fill the mist at least with a smaller supply amount, the density of the mist easily becomes higher, and therefore, it is possible to form the retention state of the mist in the retention space 4 with a smaller supply amount. Further, in the case where the mist has a large kinetic energy at the time of the supply of the mist, the mist easily spreads, and therefore, the mist hardly forms the retention state. In the case where the supply amount of the mist is small, the mist easily vaporizes, and therefore, the mist hardly forms the retention state. The inventors of the present application obtained the recognition that it is easy to retain the mist in the state where the mist is retained in the retention space 4 in the following manner based on such recognition.

[0100] Next, with reference to Figure 12 , the state where the mist is easily retained in the retention space 4 is described. As Figure 12 shown, the following evaluation was performed by changing the supply flow rate [ml / min] of the mist with respect to the temperature difference ΔT [°C] between the water temperature in the bathtub body 6 and the room temperature in the bathroom: whether the mist is retained in the retention space 4 after the rising cloud of the mist is formed to a position higher than the overflow portion of the bathtub body, whether the mist is retained in the retention space 4 in the case where the rising cloud of the mist is not formed to a position higher than the overflow portion of the bathtub body, and whether it becomes a state where the mist is suspended outside the retention space 4 and the mist is not retained in the retention space 4. At this time, the height of the lower end of the mist supply part 10 from the overflow surface 6b (the upper inner edge portion) was 50 mm, and the Sauter mean diameter of the mist was 3.1 μm or more and 10 μm or less. Note that, in the case where no water was retained in the bathtub body 6, the water temperature in the bathtub body 6 was set to the temperature of the bathtub body 6, that is, the room temperature, to perform the evaluation.

[0101] exist Figure 12 In this study, by changing the temperature difference ΔT [°C] between the water temperature inside the bathtub body 6 and the room temperature in the bathroom relative to the supply flow rate of the mist [ml / min], the following key temperature differences ΔT [°C] were found to be 0 [°C], 7.9 [°C], 11.5 [°C], 17.0 [°C], and 22.0 [°C]: whether the mist will be suspended outside the retention space 4 and not retained inside the retention space 4, and whether the mist will be retained inside the retention space 4 after the rising cloud-like mist forms to a position above the overflow section of the bathtub body. The imaginary boundary line P1 passing through these multiple temperatures represents the boundary between the region where the mist is suspended outside the retention space 4 and not retained inside the retention space 4, and the region where the mist is retained inside the retention space 4 after the rising cloud-like mist forms to a position above the overflow section of the bathtub body. Similarly, temperature differences ΔT [°C] at key points were found to be 0 [°C], 4.0 [°C], 4.3 [°C], 7.6 [°C], 8.2 [°C], and 7.5 [°C], which represent the boundaries between whether the fog will remain in the retention space 4 after the rising cloud-like fog has formed above the overflow portion of the bathtub body 6 and whether the fog will remain in the retention space 4 when the rising cloud-like fog has not formed above the overflow portion of the bathtub body. An imaginary boundary line P2 passing through these multiple temperatures represents the boundary between the region where the fog remains in the retention space 4 after the rising cloud-like fog has formed above the overflow portion of the bathtub body and the region where the fog remains in the retention space 4 when the rising cloud-like fog has not formed above the overflow portion of the bathtub body.

[0102] exist Figure 12 In the case of region N1, which is a state in which the fog is suspended outside the stagnation space 4 and does not stagnate inside the stagnation space 4, it is a region with a strong updraft due to the difference between water temperature and room temperature. Inside the stagnation space 4, the weight (gravity) of the fog is less than the force exerted on the fog by the updraft. Therefore, the fog is suspended and diffused to a position above the stagnation space 4 by the updraft.

[0103] As for region N2, where the fog remains in the retention space 4 even though the rising cloud-like fog has not formed to a position above the overflow section of the bathtub body, it is a region where the updraft generated by the difference between water temperature and room temperature is weak. The weight (gravity) of the fog in the retention space 4 is greater than the force exerted on the fog by the updraft. Therefore, the fog is difficult to rise by the updraft, and the fog remains in the retention space 4 at a position below the overflow surface 6b.

[0104] As for the region N3 which is a state in which the fog rises to a position higher than the overflow portion of the bathtub main body 6 after the fog cloud is formed and the fog remains in the remaining space 4, it is a region in which the rising airflow generated to some extent due to the difference between the water temperature and the room temperature, although the weight (gravity) of the fog in the remaining space 4 is greater than the force of the rising airflow acting on the fog, the weight of the fog is closer to the force acting by the rising airflow, and thus, after the fog rises to a position temporarily higher than the overflow surface 6b by the rising airflow and the fog cloud is formed, the fog gradually descends toward the remaining space 4, and the remaining state of the fog is formed in the remaining space 4 and at a position lower than the overflow surface 6b.

[0105] Note that, as Figure 13 indicated, the height of the lower end of the fog supply portion 10 from the overflow surface 6b (upper inner edge portion) was changed to 110 mm, and the same measurement as Figure 12 was performed. That is, Figure 13 the height of the lower end of the fog supply portion 10 from the overflow surface 6b was higher than in Figure 12 . In Figure 13 , the parameters other than the height of the lower end of the fog supply portion 10 were set to be the same as in Figure 12 .

[0106] In Figure 13 , the temperature difference ΔT [°C] between the water temperature in the bathtub main body 6 and the room temperature in the bathroom was changed with respect to the supply flow rate [ml / min] of the fog, and it was found that the temperature difference ΔT [°C] as a key point of the boundary was 0 [°C], 2 [°C], 7.2 [°C], 10.1 [°C], 15.5 [°C], 17.2 [°C], and 20.5 [°C] which became the following boundary: whether it becomes a state in which the fog is suspended outside the remaining space 4 and the fog does not remain in the remaining space 4 or a state in which the fog remains in the remaining space 4 after the fog cloud is formed to a position higher than the overflow portion of the bathtub main body 4. The boundary line P3 was calculated to pass through the plurality of temperatures, indicating the boundary between the region which becomes a state in which the fog is suspended outside the remaining space 4 and the fog does not remain in the remaining space 4 and the region which becomes a state in which the fog remains in the remaining space 4 after the fog cloud is formed to a position higher than the overflow portion of the bathtub main body.

[0107] Further, it was found that the temperature difference ΔT [°C] as a key point which becomes a boundary of whether the mist stays in the staying space 4 after the rising cloud of the mist is formed to a position higher than the overflow portion of the bathtub main body 6 or not is 0 [°C], 2.5 [°C], 3.3 [°C]. The boundary of whether the mist stays in the staying space 4 or not in the case where the rising cloud of the mist is not formed to a position higher than the overflow portion of the bathtub main body. The boundary line P4 is calculated to pass through the plurality of temperatures, indicating a boundary of a region which becomes a state where the mist stays in the staying space 4 after the rising cloud of the mist is formed to a position higher than the overflow portion of the bathtub main body and a region which becomes a state where the mist stays in the staying space 4 in the case where the rising cloud of the mist is not formed to a position higher than the overflow portion of the bathtub main body. Therefore, in the case where the temperature of the water surface is 30 [°C] and the temperature of the room is 20 [°C] (ΔT = 10 [°C]), the mist stays in the staying space 4 after the rising cloud of the mist is formed to a position higher than the overflow portion of the bathtub main body 6. In the case where the temperature of the water surface is 30 [°C] and the temperature of the room is 25 [°C] (ΔT = 5 [°C]), the mist does not stay in the staying space 4 after the rising cloud of the mist is formed to a position higher than the overflow portion of the bathtub main body 6. Figure 13 In the case where the temperature of the water surface is 30 [°C] and the temperature of the room is 20 [°C] (ΔT = 10 [°C]), the mist stays in the staying space 4 after the rising cloud of the mist is formed to a position higher than the overflow portion of the bathtub main body 6. In the case where the temperature of the water surface is 30 [°C] and the temperature of the room is 25 [°C] (ΔT = 5 [°C]), the mist does not stay in the staying space 4 after the rising cloud of the mist is formed to a position higher than the overflow portion of the bathtub main body 6. Figure 12 The regions N1, N2, N3 are shown in the same manner as

[0108] In the case where the temperature of the water surface is 30 [°C] and the temperature of the room is 20 [°C] (ΔT = 10 [°C]), the mist stays in the staying space 4 after the rising cloud of the mist is formed to a position higher than the overflow portion of the bathtub main body 6. In the case where the temperature of the water surface is 30 [°C] and the temperature of the room is 25 [°C] (ΔT = 5 [°C]), the mist does not stay in the staying space 4 after the rising cloud of the mist is formed to a position higher than the overflow portion of the bathtub main body 6. Figure 13 In the case where the temperature of the water surface is 30 [°C] and the temperature of the room is 20 [°C] (ΔT = 10 [°C]), the mist stays in the staying space 4 after the rising cloud of the mist is formed to a position higher than the overflow portion of the bathtub main body 6. In the case where the temperature of the water surface is 30 [°C] and the temperature of the room is 25 [°C] (ΔT = 5 [°C]), the mist does not stay in the staying space 4 after the rising cloud of the mist is formed to a position higher than the overflow portion of the bathtub main body 6. Figure 12 In the case where the temperature of the water surface is 30 [°C] and the temperature of the room is 20 [°C] (ΔT = 10 [°C]), the mist stays in the staying space 4 after the rising cloud of the mist is formed to a position higher than the overflow portion of the bathtub main body 6. In the case where the temperature of the water surface is 30 [°C] and the temperature of the room is 25 [°C] (ΔT = 5 [°C]), the mist does not stay in the staying space 4 after the rising cloud of the mist is formed to a position higher than the overflow portion of the bathtub main body 6. Figure 13 In the case where the temperature of the water surface is 30 [°C] and the temperature of the room is 20 [°C] (ΔT = 10 [°C]), the mist stays in the staying space 4 after the rising cloud of the mist is formed to a position higher than the overflow portion of the bathtub main body 6. In the case where the temperature of the water surface is 30 [°C] and the temperature of the room is 25 [°C] (ΔT = 5 [°C]), the mist does not stay in the staying space 4 after the rising cloud of the mist is formed to a position higher than the overflow portion of the bathtub main body 6. Figure 12 In the case where the temperature of the water surface is 30 [°C] and the temperature of the room is 20 [°C] (ΔT = 10 [°C]), the mist stays in the staying space 4 after the rising cloud of the mist is formed to a position higher than the overflow portion of the bathtub main body 6. In the case where the temperature of the water surface is 30 [°C] and the temperature of the room is 25 [°C] (ΔT = 5 [°C]), the mist does not stay in the staying space 4 after the rising cloud of the mist is formed to a position higher than the overflow portion of the bathtub main body 6.

[0109] The bathtub main body 6 is shown in the same manner as Figure 12 and Figure 13The relationship between the supply flow rate [ml / min] of the mist shown in the graph and the temperature difference ΔT [°C] between the water temperature in the bathtub main body 6 and the room temperature in the bathroom. The present inventors have confirmed that the same tendency of the relationship holds not only in the bathtub main body 6 but also in other water receiving equipment, such as a bathroom bathing place floor, a shower room, a hand washing basin, a washstand basin, a kitchen sink, a toilet, and the like, in which the volume of the retention space 4 is different from that of the bathtub main body 6. For example, in each of these pieces of equipment, the volume of the retention space 4 is smaller than that in the bathtub main body 6.

[0110] In the case where the volume of the retention space 4 of the bathtub main body 6 is small as shown in the graph, Figure 12 In the case where the volume of the retention space 4 of the bathtub main body 6 is small as shown in the graph, the density of the mist easily becomes high, and the mist easily forms a retention state, and therefore, Figure 12 the position of the imaginary boundary line P1 in the graph moves upward (for example, is represented by an imaginary boundary line P5). Figure 12 the position of the imaginary boundary line P2 in the graph also moves upward (for example, is represented by an imaginary boundary line P6). Conversely, in the case where the volume of the retention space 4 of the bathtub main body 6 is large as shown in the graph, Figure 12 In the case where the volume of the retention space 4 of the bathtub main body 6 is large as shown in the graph, the density of the mist easily becomes low, and the mist hardly forms a retention state, and therefore, Figure 12 the position of the imaginary boundary line P1 in the graph moves downward (for example, is represented by an imaginary boundary line P7). Figure 12 the position of the imaginary boundary line P2 in the graph also moves downward (for example, is represented by an imaginary boundary line P8).

[0111] In the case where the volume of the retention space 4 of the bathtub main body 6 is small as shown in the graph, Figure 12 and Figure 13 In the case where the particle diameter of the mist generated by the ultrasonic vibrator 18 is larger than that used in the graph in Figure 12 In the case where the particle diameter of the mist generated by the ultrasonic vibrator 18 is larger than that used in the graph in Figure 12 the position of the imaginary boundary line P1 in the graph moves upward (for example, is represented by an imaginary boundary line P5). Further, Figure 12 the position of the imaginary boundary line P2 in the graph also moves upward (for example, is represented by an imaginary boundary line P6). Conversely, in the case where the particle diameter of the mist generated by the ultrasonic vibrator 18 is smaller than that used in the graph in Figure 12 In the case where the particle diameter of the mist generated by the ultrasonic vibrator 18 is smaller than that used in the graph in Figure 12 the position of the imaginary boundary line P1 in the graph moves downward (for example, is represented by an imaginary boundary line P7). Further, Figure 12 the position of the imaginary boundary line P2 in the graph also moves downward (for example, is represented by an imaginary boundary line P8).

[0112] Thus, the case where the volume of the retention space 4 changes, the case where the particle diameter of the mist changes, and the like can be understood as the relationship between the state where the mist is retained in the retention space 4 and the state where the mist is not retained in the retention space 4. Figure 13 and Figure 14 the state where the mist is retained in the retention space 4 and the state where the mist is not retained in the retention space 4.

[0113] Next, with reference to Figure 14 , a method of measuring the ambient temperature of the mist in the bathtub main body 6 will be described. The ambient temperature [°C] of the mist in the bathtub main body 6 is measured using a temperature measuring device capable of measuring the temperature of air, such as a thermistor 95. When the ambient temperature of the mist in the bathtub main body 6 is to be measured, the thermistor 95 is disposed to measure. The temperature measuring portion of the thermistor 95 is disposed at the central portion of the long side and the central portion of the short side of the bathtub main body 6 and at the central portion of the height from the surface of the water retained in the bathtub main body 6 to the overflow face 6b to measure the temperature of the mist. For example, the ambient temperature of the mist in the bathtub main body 6 is measured based on the temperature at which the temperature rise substantially stops after a sufficient time has elapsed (for example, 2500 [s]) after the start of mist supply. Care is taken so that an extreme gradient of the temperature of the measurement target does not occur at the time of measurement.

[0114] Next, with reference to Figure 14 , a method of 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 temperature of water, such as a thermistor 99. When the water temperature in the bathtub main body 6 is to be measured, the thermistor 99 is disposed at a prescribed position in the bathtub main body to measure the water temperature. The temperature measuring portion of the thermistor 99 is disposed at the central portion of the long side and the central portion of the short side of the bathtub main body 6 and at the central portion of the depth of the water retained in the bathtub main body 6 to measure the water temperature. Care is taken so that an extreme gradient of the temperature of the measurement target does not occur at the time of measurement.

[0115] Next, with reference to Figure 15 , a method of measuring the room temperature in the bathroom in which the bathtub main body 6 is provided will be described. The mist generating portion 8 is provided with an indoor temperature measurer 24, and thus the room temperature is basically measured by the indoor temperature measurer 24. In the case where the mist generating portion 8 is not provided with the indoor temperature measurer 24, in the case where it is not possible (or difficult) to measure the room temperature by the indoor temperature measurer 24, the thermistor 86 is disposed at a prescribed position in the vicinity of the bathtub main body in the bathroom space to measure the room temperature. The temperature measuring portion of this thermistor 86 is disposed, for example, at a position 200 mm to the side of the bathtub main body 6, at a position 200 mm ahead along the long side direction of the bathtub main body from the wall on the inner side of the paper, and at a position 1000 mm above the ground, to measure the room temperature. Care is taken so that an extreme gradient of the temperature of the measurement target does not occur at the time of measurement.

[0116] Next, a flow rate measuring device and a measuring method of the flow rate of the mist supplied from the mist supply portion 10 will be described with reference to Figures 16 to 18

[0117] The flow rate measuring device 90 of the flow rate of the mist is provided with: the mist generating portion 8; the mist supply portion 10; a support structure 91 that supports the mist generating portion 8 and the mist supply portion 10 on a water storage tank; the water storage tank 92 that stores water; a water supply pump 94 that supplies water from the water storage tank 92 to the mist generating portion 8; a fan 96 that sends the mist supplied from the mist supply portion 10 outside the flow rate measuring device 90; and an electronic balance 98 that measures weight. The ultrasonic transducer 18 of the mist generating portion 8 is driven by an oscillation circuit 93 mounted on 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 in a state in which the water for mist generation and the mist generating portion 8 and the like for mist generation are loaded on the electronic balance 98. The electronic balance 98 uses a GF-32K manufactured by A&D Company Limited.

[0118] ​In the flow rate measuring device 90, the weight of the mist generating section 8, the mist supply section 10, the support structure 91, the water storage tank 92 in which water is stored, the water supply pump 94, and the fan 96 (hereinafter, referred to as the weight of the mist generating section 8 and the like) in a state before mist generation is measured by the electronic balance 98. Thereafter, the generation of mist is performed while maintaining the state in which the mist generating section 8 and the like are loaded on the electronic balance 98. In such a flow rate measuring device 90, water is supplied to the mist generating section 8 by the water supply pump 94, and water is drained from the overflow pipe 31, whereby the water level is substantially fixed. The mist is generated by driving the ultrasonic vibrator 18, and the mist flowing out from the mist supply section 10 is sent out of the flow rate measuring device 90 by the fan 96. At a time point one minute after the start of driving of the ultrasonic vibrator 18, the driving of the ultrasonic vibrator 18 is stopped, and the weight of the mist generating section 8 and the like is measured by the electronic balance 98. Thus, the amount of decrease at the time of mist generation can be found by the following equation "amount of decrease at the time of mist generation = weight of the mist generating section 8 and the like before mist generation - weight of the mist generating section 8 and the like after mist generation". On the basis thereof, the supply flow rate of mist can be found by the following equation "supply flow rate of mist [ml / min] = amount of decrease at the time of mist generation - evaporation amount". As for the supply flow rate of mist [ml / min] obtained in such a manner, the same measurement of the supply flow rate of mist [ml / min] is performed three times, the average of the measurement results is found, and the final supply flow rate of mist [ml / min] is determined. Further, the evaporation amount is an amount taking into account the natural evaporation amount itself in the measurement. Thus, in the flow rate measuring device 90, the amount of decrease in weight after one minute is measured without driving the ultrasonic vibrator 18. The same series of measurement of the amount of decrease in weight is performed three times, the average of the measurement results is found, and the final amount of decrease in weight is determined as the evaporation amount, which is used for the estimation of the supply flow rate of mist described above.

[0119] In the flow rate measuring device 90, the measurement is performed in such a manner that water other than mist (for example, water droplets of a water column generated by the ultrasonic vibrator and the like) is not splashed to the outside of the flow rate measuring device 90. Further, the flow rate measuring device 90 is configured such that, even in a case where a part of the generated mist is restored to water in the mist supply section 10, the water returns to the water storage tank 92 and the like. The fan 96 is set to a wind amount and a direction at which the mist can flow out to the outside without stagnating in the mist supply section 10 and the mist generating section 8.

[0120] Next, the measurement device and the measurement method of the particle diameter of the mist supplied from the mist supply section 10 will be described with reference to Figure 17 to FIG. 9.

[0121] The mist particle size measuring device 37 includes a box-shaped device 39 with an imaginary retention space 34 of the same size and shape as described above, and a particle size distribution measuring device 53. A 20mm × 20mm square opening 52 is formed near the center of the side wall of the box-shaped device 39, i.e., the side wall of the imaginary retention space 34, and a cover 57 is installed on the opening 52. When it is necessary to measure the mist particle size, the mist particle size is measured by using the mist particle size measuring device 37 instead of the bathtub body 6. The measuring device 37 is positioned such that the lower end of the mist supply unit 10 is in a positional relationship with the measuring device 37 and the positional relationship between the mist supply unit 10 and the bathtub body 6 are approximately the same, and the mist is supplied from the mist supply unit 10 to the measuring device 37 in the same manner as the supply of mist from the mist supply unit 10 to the bathtub body 6.

[0122] like Figure 18 As shown, the particle size distribution measuring device 53 includes a particle size measuring laser 54, which is configured such that the measuring region E of the particle size measuring laser is located near and facing the opening 52. The particle size measuring laser 54 is configured such that, when viewed from above, the laser beam of the particle size measuring laser 54 is parallel to the long side of the imaginary confinement space 34. The measuring region E through which the laser beam emitted from the particle size measuring laser 54 passes is located facing the opening 52. The measuring region E is located at a distance of 150 mm from the opening 52. The particle size distribution measuring device 53 also includes a measuring lens 56 to detect the diffraction and scattered light of the laser beam.

[0123] With the cover 57 installed in the opening, mist supply begins into the imaginary retention space 34. The supply port of the mist supply unit 10 is not shown in the diagram. One minute after the start of mist supply, the cover 57 is opened, allowing the mist to leak towards the measurement area E of the particle size measuring laser 54. With the transmittance of the particle size measuring laser 54 at 60%–90%, the distribution of scattered light is measured through the measuring lens 56. For example, the particle size measuring laser 54 and the measuring lens 56 are the Aerotrac LDSA-SPR1500A from the spray particle size distribution measuring device manufactured by Macquarie Ltd. Ten measurements of the particle size distribution data are performed, and the data is recorded on a PC (personal computer). The ten particle size distribution data are averaged on the PC. Figure 18 The image shows an example of particle diameter distribution data measured by particle diameter distribution measuring device 53. Figure 19In the left vertical axis, the frequency [%] is shown, in the right vertical axis, the cumulative [%] is shown, and in the horizontal axis, the particle diameter [μm] is shown. For example, PC can analyze the particle diameter distribution data obtained in this way, and acquire, for example, the 20th percentile particle diameter G of the particle diameter distribution data as the particle diameter data, or acquire, for example, the Sauter mean particle diameter H as the particle diameter data. The Sauter mean particle diameter indicates a particle diameter having the same volume-based surface area ratio as the total volume of all particles with respect to the total surface area of all particles. By calculating the average particle diameter using the Sauter mean particle diameter, it is possible to suppress the influence of a small number of particles having a large particle diameter on the measured value. It is possible to measure the main (for example, more than half) particle diameter of the mist supplied from the mist supply portion 10 in this way. The Sauter mean particle diameter H of the mist supplied from the mist device 1 in the present embodiment is 3.1 μm or more and 10 μm or less. It is possible to change the Sauter mean particle diameter H of the mist by, for example, changing the output of the ultrasonic transducer 18 of the mist generating portion 8, changing the vibration frequency of the ultrasonic transducer 18, or changing the mist generating means to a centrifugal separation device or the like. For example, it is also possible to set the Sauter mean particle diameter H of the mist supplied from the mist supply portion 10 in such a way as to be changed within a range of 3.1 μm or more and 40 μm or less.

[0124] Next, with reference to Figure 19 , the determination device and the determination method of whether or not the mist is in a stagnation state (whether or not the mist stagnation layer C is formed) in the stagnation space 4 inside the bathtub main body 6 will be described.

[0125] As shown in Figure 11 , the internal transmittance measured inside the stagnation space 4 by the transmittance measuring device 68 is compared with the external transmittance measured outside the stagnation space 4, and in the case where the internal transmittance is lower than the external transmittance, it is determined that the mist is stagnating inside the stagnation space 4. More specifically, according to the internal transmittance / external transmittance < 1, it is determined that the mist is stagnating inside the stagnation space 4.

[0126] For example, as shown in Figure 19 , in the state where the mist is stagnating inside the stagnation space 4, the internal transmittance decreases. On the other hand, the mist mainly stagnates inside the stagnation space 4, and the external transmittance measured at a position higher than the stagnation boundary surface 66 becomes a high value. Therefore, the internal transmittance / external transmittance < 1, and it is determined that the mist is stagnating inside the stagnation space 4. Note that it can also be determined that the mist is stagnating inside the stagnation space 4 according to the internal transmittance being within a range of 15% or less.

[0127] Next, with reference to ​ , the transmittance measuring device 68 will be described.

[0128] As to whether or not the stagnation state is formed, it is possible to determine by installing the transmissivity measuring device 68 to the bathtub main body 6.

[0129] The transmissivity measuring device 68 is provided with a first laser device 70 which is arranged inside the stagnation space 4 at a measuring portion, and a first transmissivity measuring device 72 which receives the laser. The first laser device 70 and the first transmissivity measuring device 72 are arranged 150 mm apart in the horizontal direction at a position 150 mm below the upper end of the stagnation space 4 (for example, a depth position of about one third of the depth of the stagnation space 4). The first laser device 70 and the first transmissivity measuring device 72 are arranged near the center of the stagnation space 4 in plan view. The intensity of the laser measured by the first transmissivity measuring device 72 is measured with respect to the intensity of the laser emitted from the first laser device 70, and thereby the internal transmissivity is measured.

[0130] The transmissivity measuring device 68 is further provided with a second laser device 74 which is arranged outside the stagnation space 4, and a second transmissivity measuring device 76 which receives the laser. The second laser device 74 and the second transmissivity measuring device 76 are arranged 150 mm apart in the horizontal direction at a position 150 mm above the upper end of the stagnation space 4 (for example, a position above the stagnation boundary surface 66 which is assumed to be the upper end of the stagnation layer C). The second laser device 74 and the second transmissivity measuring device 76 are arranged near the center of the stagnation space 4 in plan view. The intensity of the laser measured by the second transmissivity measuring device 76 is measured with respect to the intensity of the laser emitted from the second laser device 74, and thereby the external transmissivity is measured. The internal transmissivity and the external transmissivity within the stagnation space 4 can be measured in this manner, respectively.

[0131] As a more specific device configuration of the measuring device 68, the laser emitted from a digital optical fiber amplifier FS-N11MN manufactured by the company Gains Co. is emitted by a FU-77TZ (the first laser device 70 or the second laser device 74) manufactured by the same company, and is received by a FU-77TZ (the first transmissivity measuring device 72 or the second transmissivity measuring device 76) manufactured by the same company. The received light is returned to the optical fiber amplifier FS-N11MN, and a voltage output of, for example, 1 V to 5 V is performed in accordance with the light amount. The light amount is, for example, 1500 to 4500. The output voltage is measured by an NR-HA08 of the NR-500 series manufactured by the same company, and is scaled to a value of 0% to 100% on a PC. The transmissivity data is measured, for example, at a sampling period of 100 ms. For example, after the supply of the mist is started in a substantially constant amount, the stagnation layer C is formed, and thereafter, the transmissivity data is calculated in an average manner for, for example, 30 seconds. For example, in the case where the determination measurement of the rising cloud state of the mist is performed, the average calculation is not performed, and the determination is performed in accordance with the data of the time lapse.

[0132] Next, the effects achieved by the configuration of the present embodiment will be described.

[0133] In one embodiment of the present application thus configured, the mist supplied from the mist supply part 10 forms a rising cloud of mist in such a manner that the mist rises to a position higher than the overflow portion of the bathtub main body 6, and therefore the rising cloud of mist is formed to a height of the face of the user who sits in the bathtub main body 6 using the mist device 1. Thus, the user's face is cooled by the heat of vaporization of a part of the mist of the rising cloud, and the body is warmed by the mist bath using the mist retention layer. Therefore, the user's comfort during the mist bath is improved.

[0134] In one embodiment of the present application thus configured, the mist device 1 is configured to form a rising cloud of mist in such a manner that the mist supplied from the mist supply part 10 rises by the upward rising airflow in the bathtub main body 6 to a position higher than the overflow portion of the bathtub main body 6. Thus, the rising cloud of mist is formed in such a manner that the mist rises from the bathtub main body 6 without physically configuring a structure for forming the rising cloud of mist in the bathtub main body 6.

[0135] In one embodiment of the present application thus configured, the mist device 1 forms the upward rising airflow in the bathtub main body 6 by the temperature difference between the temperature of the water stored in the bathtub main body 6 and the temperature of the bathroom in which the bathtub main body 6 is used before the supply of the mist is started. Thus, the rising cloud of mist is formed in such a manner that the mist rises from the bathtub main body 6 by the upward rising airflow.

[0136] In one embodiment of the present application thus configured, the mist device 1 is configured to cause a part of the mist in the retention space 4 to rise to a position higher than the overflow portion of the water of the bathtub main body 6 after the supplied mist forms the mist retention layer C in the retention space 4 of the bathtub main body 6. Thus, a part of the mist in the retention space 4 after the formation of the mist retention layer C rises to a position higher than the overflow portion and is vaporized, and the user's face is cooled by the heat of vaporization, and the body is warmed by the mist bath using the mist retention layer C. Therefore, the user's comfort during the mist bath is further improved.

[0137] In one embodiment of the present application thus configured, the mist device 1 is configured to generate an upward rising airflow that causes a part of the mist in the bathtub main body 6 to rise by the temperature difference between the ambient temperature of the mist in the bathtub main body 6 supplied from the mist supply part 10 and the temperature of the bathroom in which the bathtub main body 6 is used in a state in which the mist retention layer is formed. Thus, the mist in the bathtub main body 6 is easily caused to rise from the bathtub main body 6 by the upward rising airflow.

[0138] In one embodiment of the present application thus configured, the mist device 1 can supply the mist from within the bathtub main body 6 to the floor in the bathroom where the bathtub main body 6 is disposed, after the retention layer C of the mist is formed. Thus, the mist can also be vaporized from the floor in the bathroom, and the space in the bathroom can be more effectively cooled using the vaporization heat. Therefore, the user's face exposed from the bathtub main body 6 can be further cooled, and the body can be warmed as a mist bath using the retention layer C of the mist. Thus, the user's comfort during the mist bath can be further improved.

[0139] In one embodiment of the present application thus configured, the retention boundary surface 66 of the retention layer of the mist is formed at a position higher than the overflow portion of the bathtub main body 6. Thus, the user's body can be warmed as a mist bath until the retention boundary surface 66 of the mist at a position higher than the overflow portion of the bathtub main body 6 as the mist is retained.

[0140] In one embodiment of the present application thus configured, the lower end of the mist supply portion 10 is disposed at a position higher than the overflow portion of the bathtub main body 6. Thus, compared to a case where the lower end of the mist supply portion 10 is located at a position lower than the overflow portion, the retention boundary surface 66 can be easily formed at a position higher than the overflow portion with a small flow rate of the mist.

[0141] Further, one embodiment of the present application is a mist system 2 characterized by including: the mist device 1 of one embodiment of the present application; and the bathtub main body 6 in which the retention space 4 that receives the mist supplied from the mist supply portion 10 of the mist device 1 is formed.

[0142] In one embodiment of the present application thus configured, the inner side wall of the bathtub main body 6 opposite to the mist supply portion 10 is formed to be inclined outward toward the upper side. Thus, the mist supplied from the mist supply portion 10 can easily rise along the inner side wall to a position higher than the overflow portion of the bathtub main body 6, and a rising cloud of the mist can be easily formed.

[0143] In one embodiment of the present application thus configured, the mist supply portion 10 of the mist device 1 is disposed on the short side of the bathtub main body 6. Thus, the mist supply portion 10 can supply the mist toward the long side of the bathtub main body 6, and the mist can be easily suspended above the bathtub main body 6 even if the mist rises toward the upper side of the bathtub main body 6. In contrast, in a case where the mist supply portion 10 is disposed on the long side of the bathtub main body 6, the rising mist easily goes to the side of the bathing place outside the bathtub main body 6.

Claims

1. A mist system comprising: a bathtub main body; a mist device for the bathtub main body; and a bathroom air conditioner provided in a bathroom in which the mist device and the bathtub main body are installed, wherein the mist device comprises: a mist generating portion that generates mist; and a mist supply portion that supplies the mist generated by the mist generating portion into the bathtub main body in which a retention space that is open upward is formed, the mist supplied from the mist supply portion forms a rising cloud of mist that rises to a position higher than an overflow portion of the bathtub main body after the rising cloud of mist is formed, the mist supplied forms a retention layer of mist in the retention space of the bathtub main body, the mist device is configured to cause the mist supplied from the mist supply portion to form the rising cloud of mist that rises to the position higher than the overflow portion of the bathtub main body using an upward rising airflow from inside the bathtub main body, and the bathroom air conditioner adjusts a temperature in the bathroom, controls an intensity of the upward rising airflow from inside the bathtub main body based on a temperature difference between a temperature of water stored in the bathtub main body and a temperature in the bathroom using the bathtub main body before a start of the supply of the mist, and thereby controls the rising cloud of mist.

2. The mist system according to claim 1, wherein the mist device is configured to form the upward rising airflow from inside the bathtub main body based on the temperature difference between the temperature of the water stored in the bathtub main body and the temperature in the bathroom using the bathtub main body before the start of the supply of the mist.

3. The mist system according to claim 1 or 2, wherein the mist device is configured to cause a portion of the mist in the retention space to rise to a position higher than the overflow portion of the water of the bathtub main body after the supplied mist forms the retention layer of mist in the retention space of the bathtub main body.

4. The mist system according to claim 1 or 2, wherein the mist device is configured to cause the mist in the bathtub main body to generate the upward rising airflow based on a temperature difference between an ambient temperature of the mist in the bathtub main body supplied from the mist supply portion and a temperature in the bathroom using the bathtub main body in a state in which the retention layer of mist is formed.

5. The mist system according to claim 1 or 2, wherein the mist device also supplies the mist from inside the bathtub main body to a floor in the bathroom in which the bathtub main body is installed after the retention layer of mist is formed in the retention space of the bathtub main body.

6. The mist system according to claim 5, wherein a retention boundary surface of an upper side of the retention layer of mist is formed at a position higher than the overflow portion of the bathtub main body.

7. The mist system according to claim 6, wherein a lower end of the mist supply portion is disposed at a position higher than the overflow portion of the bathtub main body.

8. The mist system according to claim 1, wherein an inner side wall of the bathtub main body that opposes the mist supply portion is formed to be inclined outward toward the upward direction.

9. The mist system according to claim 1 or 8, wherein the mist supply portion of the mist device is disposed at a short side of the bathtub main body. ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

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