Water mist generating device and bathtub device provided with same

Abstract

The present invention provides a water mist generating device that allows water mist in a heated state to be retained in an open retention space above. Specifically, the present invention is a water mist generating device (1) for a bathtub body, comprising: a water mist generating unit (8) for generating water mist from heated and temperature-controlled water, or for generating temperature-controlled water mist by heating water mist generated from water; and a water mist supply unit (10) for supplying water mist generated by the water mist generating unit (8) to a bathtub body (6) having a retention space (4) above which the retention space (4) is open to the room in which the bathtub body is disposed, wherein the water mist generating unit (8) and the water mist supply unit (10) are configured such that the water mist supplied from the water mist supply unit (10) is retained in the retention space (4) of the bathtub body (6).

Description

Technical Field

[0001] This invention relates to a water mist generating device, and more particularly to a water mist generating device used in a bathtub device. Background Technology

[0002] Previously, as shown in Patent Document 1, there was a bathtub sauna device for sauna bathing, which had a bathtub cover installed on the upper part of the bathtub body in order to create a sauna space utilizing water mist.

[0003] Patent documents

[0004] Patent Document 1: Japanese Patent Application Publication No. 2008-018130

[0005] Patent Document 2: Japanese Patent Application Publication No. 2014-057952 Summary of the Invention

[0006] However, the bathtub sauna device shown in Patent Document 1 has the following problem: since a bathtub cover is required to form a sauna space, the user's position is restricted, comfort is compromised, and user convenience is lacking.

[0007] In contrast, as shown in Patent Document 2, an ultrasonic atomizing unit is proposed, which includes the following: in order to prevent the mist from easily spreading through the rising airflow, the water temperature of the atomizing tank is controlled so that it does not rise.

[0008] However, if such an ultrasonic atomizing unit is used, there is a problem that the mist will diffuse when the temperature of the water mist increases. As a result, in order to prevent the diffusion of the water mist, it is necessary to install a bathtub cover as shown in Patent Document 1.

[0009] Therefore, the present invention is an invention that solves the problems of the prior art mentioned above. The technical problem to be solved is to provide a water mist generating device that can retain water mist in a heated state in an open space above.

[0010] To address the aforementioned issues, one embodiment of the present invention provides a water mist generating device for a bathtub body, comprising: a water mist generating unit that generates water mist from heated and temperature-controlled water, or generates temperature-controlled water mist by heating water mist generated from water; and a water mist supply unit that supplies the water mist generated by the water mist generating unit into the bathtub body having an open-top retention space, characterized in that the water mist generating unit and the water mist supply unit are configured such that the water mist supplied from the water mist supply unit is retained in the retention space of the bathtub body.

[0011] In one embodiment of the present invention, the water mist generating unit and the water mist supply unit are configured such that the water mist supplied from the water mist supply unit is retained in the retention space of the bathtub body. Therefore, water mist in a heated state can be retained in the open retention space above the bathtub body. As a result, since the water mist can be retained in the open retention space above the bathtub body without a cover, the need for a user cover is eliminated, improving convenience. Furthermore, since the user can use the water mist to heat the bathtub body without a cover, user comfort is also improved. In addition, since the user can use the water mist to heat the bathtub body, there is no feeling of pressure compared to immersing in water, allowing for a mist bath with reduced physical burden. Moreover, since the heat stimulation is slowly conducted to the user compared to immersion in water, a mist bath can be performed while reducing the user's physical burden.

[0012] In one embodiment of the present invention, the water mist generating unit preferably includes a water temperature detection unit for detecting water temperature.

[0013] In one embodiment of the present invention configured as described above, since the water mist generating unit is equipped with a water temperature detection unit, the water temperature can be reliably controlled by detecting the water temperature. Therefore, the water mist generating unit and the water mist supply unit can more reliably retain the water mist in the heating state within the retention space of the bathtub body.

[0014] In one embodiment of the present invention, it is preferable that the water mist generating unit generates water mist from water heated to above 60°C while simultaneously controlling the temperature of the water, or simultaneously heats the water mist generated from the water to above 60°C while controlling the temperature of the heated water mist.

[0015] In one embodiment of the invention configured as such, by heating water or water mist to above 60°C, the effects of at least some bacteria (e.g. Legionella) can be suppressed, even assuming the presence of bacteria in the water.

[0016] In one embodiment of the invention, it is preferable to form the retention boundary surface of the upper side of the retained water mist at a height position that is lower than the height of the overflow surface of the bathtub body plus a height equivalent to the depth of the bathtub body.

[0017] In one embodiment of the invention configured as described above, since the retention boundary surface of the water mist on the upper side is formed at a height position lower than the height of the overflow surface of the bathtub body plus the height equivalent to the depth of the bathtub body, the situation where the retention boundary surface is formed at an excessively high position can be suppressed, thereby improving the user's comfort.

[0018] In one embodiment of the invention, it is preferable to form the retention boundary surface of the upper side of the retained water mist at a position higher than the overflow surface of the bathtub body.

[0019] In one embodiment of the invention configured as described above, since the retention boundary surface of the water mist is formed at a height higher than the overflow surface of the bathtub body, it is convenient to perform a mist bath on the upper part of the user's body sitting in the bathtub body, and the user's body can be heated at a higher level than the usual water level, thereby further improving the user's comfort.

[0020] In this invention, it is preferable that the retention boundary surface of the water mist on the upper side is formed at a height position that is lower than the height of the overflow surface of the bathtub body plus a value between 100 mm and 200 mm.

[0021] In one embodiment of the invention configured in this way, since the retention boundary surface of the water mist on the upper side is formed at a height that is lower than the height of the overflow surface of the bathtub body plus a value between 100mm and 200mm, it is easy to form the retention boundary surface at a position lower than the face of the user sitting in the bathtub body, thereby further improving the user's comfort.

[0022] In this invention, it is preferable to position the water mist supply section above the water overflow section within the bathtub body.

[0023] In one embodiment of the present invention configured in this way, since the water mist supply section is positioned above the water overflow section in the bathtub body, the intrusion of water from the bathtub body as sewage into the upstream side from the water mist supply section can be suppressed.

[0024] In this invention, it is preferable that the overflow portion of the water in the bathtub body is the overflow surface of the bathtub body.

[0025] In one embodiment of the present invention configured in this way, since the water mist supply section is positioned above the overflow surface of the water in the bathtub body, it is possible to prevent water in the bathtub body from intruding from the water mist supply section to the upstream side as sewage.

[0026] In this invention, the preferred water mist generating device further includes a temperature detection unit for detecting the temperature inside the bathroom where the bathtub body is located.

[0027] In one embodiment of the present invention configured as such, since the water mist generating device also includes a temperature detection unit for detecting the temperature inside the bathroom where the bathtub body is located, the water mist generating unit can generate water mist in a heated state according to the temperature inside the bathroom where the bathtub body is located. Therefore, the water mist generating unit and the water mist supply unit can make the water mist in a heated state more reliably retained in the retention space of the bathtub body.

[0028] In this invention, it is preferable that the water mist supply unit has a downward-opening water mist supply port.

[0029] In one embodiment of the present invention configured as described above, since the mist supply unit has a downward-opening mist supply port, compared to a mist supply port that is horizontally or upward-opening, the travel distance of the mist supplied from the mist supply port to the bathtub body can be reduced to a shorter distance. Furthermore, it can prevent situations where the temperature of the mist arriving in the bathtub body is difficult to adjust due to temperature changes such as a decrease in the mist temperature during its journey from the mist supply port to the bathtub body. Therefore, it is easier for the heated mist to remain in the open retention space above the bathtub body. Moreover, for example, since the mist supply unit has a downward-opening mist supply port, it can prevent water in the bathtub body from flowing into the upstream side as wastewater from the mist supply unit.

[0030] In this invention, a bathtub device is preferably provided, comprising: a water mist generating device; and the bathtub body having a retention space for receiving water mist supplied from the water mist supply section of the water mist generating device.

[0031] Furthermore, one embodiment of the present invention is a bathtub device, characterized in that it comprises: a water mist generating device according to one embodiment of the present invention; and the bathtub body, having a retention space for receiving water mist supplied from the water mist supply section of the water mist generating device.

[0032] In this invention, it is preferable that the water mist generating part and the water mist supply part of the water mist generating device are arranged on the short side of the bathtub body.

[0033] In one embodiment of the present invention, with the water mist generating unit and the water mist supply unit of the water mist generating device disposed on the short side of the bathtub body, the water mist supplied from the water mist supply unit can be supplied relatively evenly in the left-right direction of the short side within the retention space of the bathtub body, thereby suppressing the disturbance of water mist retention. Furthermore, since a mist stream that adjusts the water mist to be relatively uniform can be supplied in the left-right direction of the short side, and this mist travels along the long side, it can easily provide the user with a therapeutic effect and a sophisticated visual effect.

[0034] According to the water mist generating device of the present invention, water mist in a heated state can be retained in the open retention space above. Attached Figure Description

[0035] Figure 1 This is a perspective view of a bathtub device equipped with the water mist generating apparatus according to the first embodiment of the present invention.

[0036] Figure 2 This is a cross-sectional view illustrating the structure of a bathtub device equipped with the water mist generating apparatus according to the first embodiment of the present invention.

[0037] Figure 3 This diagram illustrates the water mist supply operation of the water mist generating apparatus according to the first embodiment of the present invention.

[0038] Figure 4 This diagram illustrates the water mist supply operation of the water mist generating apparatus according to the first embodiment of the present invention.

[0039] Figure 5 This diagram illustrates the water mist supply operation of the water mist generating apparatus according to the first embodiment of the present invention.

[0040] Figure 6 This diagram illustrates the water mist supply operation of the water mist generating apparatus according to the first embodiment of the present invention.

[0041] Figure 7 This diagram illustrates the water mist supply operation of the water mist generating apparatus according to the first embodiment of the present invention.

[0042] Figure 8 This diagram illustrates the water mist supply operation of the water mist generating apparatus according to the first embodiment of the present invention.

[0043] Figure 9 This is a top view of a measuring device that measures the temperature of water mist supplied from the water mist supply unit of the water mist generating apparatus of the first embodiment of the present invention to the retention space in a hypothetical retention space.

[0044] Figure 10 This is a front view of a measuring device that measures the temperature of water mist supplied from the water mist supply unit of the water mist generating apparatus of the first embodiment of the present invention to the retention space in a hypothetical retention space.

[0045] Figure 11 This is a side view of a measuring device that measures the temperature of water mist supplied from the water mist supply unit of the water mist generating apparatus of the first embodiment of the present invention to the retention space in a hypothetical retention space.

[0046] Figure 12This is a graph showing the change in the water mist atmosphere temperature of the water mist supplied from the water mist generating apparatus according to the first embodiment of the present invention.

[0047] Figure 13 This is a graph showing the range of temperature difference between the water mist supplied from the water mist supply unit to the stagnant space and the indoor temperature of the water-using facility before the water mist supply begins, according to the water mist generating apparatus of the first embodiment of the present invention.

[0048] Figure 14 This is a perspective view of a device for measuring the particle size of water mist supplied from the water mist supply unit of the water mist generating apparatus according to the first embodiment of the present invention.

[0049] Figure 15 This is a top view of a device for measuring the particle size of water mist supplied from the water mist supply section of the water mist generating apparatus according to the first embodiment of the present invention.

[0050] Figure 16 This is a diagram showing an example of particle size distribution data obtained by measuring the particle size of water mist supplied from the water mist supply unit of the water mist generating apparatus according to the first embodiment of the present invention using a particle size distribution measuring device.

[0051] Figure 17 The water mist supplied from the water mist supply unit of the water mist generating apparatus according to the first embodiment of the present invention is shown in a graph representing the relationship between the temperature difference between the water mist and the indoor temperature and the particle size of the water mist.

[0052] Figure 18 This is a perspective view of an observation device for observing the state of water mist supplied from the water mist supply unit of the water mist generating apparatus according to the first embodiment of the present invention after it is supplied to a hypothetical lingering space.

[0053] Figure 19 This is a graph comparing the state of water mist supplied from the water mist supply unit of the water mist generating apparatus of the first embodiment of the present invention after it is supplied to an imaginary stagnation space, based on temperature difference and water mist particle size.

[0054] Figure 20 The diagram shows a transmittance measuring device relating to the determination of whether water mist supplied from the water mist supply section of the water mist generating apparatus of the first embodiment of the present invention is retained.

[0055] Figure 21 This is a diagram illustrating the difference between a mist bath and a regular tub bath, achieved by measuring heat flux and time elapsed, using water mist supplied from the water mist supply unit of the water mist generating apparatus according to the first embodiment of the present invention.

[0056] Figure 22The figure shows the results of measuring the user's skin temperature 10 minutes after bathing in a mist bath and a regular tub bath, respectively, using mist supplied by the mist supply unit of the mist generating device according to the first embodiment of the present invention.

[0057] Figure 23 This is a perspective view of a bathtub device equipped with the water mist generating apparatus according to the second embodiment of the present invention.

[0058] Figure 24 This is a side view of a bathtub device equipped with the water mist generating device according to the second embodiment of the present invention.

[0059] Symbol Explanation

[0060] 1-Water mist generating device; 2-Bathing tub device; 4-Stay space; 6-Bathing tub body; 6b-Overflow surface; 6c-Overflow section; 8-Water mist generating section; 10-Water mist supply section; 24-Indoor temperature measuring instrument; 101-Water mist generating device; 110-Water mist supply section; 113-Water mist supply port; A-User; B-Water; C-Stay layer. Detailed Implementation

[0061] The embodiments of the present invention disclosed herein will now be described in detail with reference to the accompanying drawings. From the following description, it will be apparent to those skilled in the art that further modifications or other embodiments of the invention will be found. Therefore, the following description should be understood as illustrative only, provided to teach those skilled in the art the optimal form for carrying out the invention. Substantial changes may be made to the details of the structure and / or function without departing from the spirit of the invention.

[0062] Hereinafter, a bathtub device equipped with a water mist generating apparatus according to the first embodiment of the present invention will be described with reference to the accompanying drawings.

[0063] Figure 1 This is a perspective view of a bathtub device equipped with the water mist generating apparatus according to the first embodiment of the present invention. Figure 2 This is a side view of a bathtub device equipped with the water mist generating device according to the first embodiment of the present invention.

[0064] like Figure 1 and Figure 2As shown, a bathtub device 2 equipped with the water mist generating device 1 according to the first embodiment of the present invention is installed in a bathroom 3. A water-using facility is a device that provides a water-dispensing device for use in a bathroom, the bathing area floor of a bathroom, a toilet, a washroom, a kitchen, etc. The water mist generating device 1 is a water mist generating device used on the bathtub body of the water-using facility, the bathing area floor of the bathroom, the shower room, the washbasin, the sink, and the kitchen sink. The bathroom 3 is a box-shaped space, forming a partially enclosed interior space 5 for the use of water inside. The water includes water with a temperature higher than the outside air temperature (room temperature) and heated water (so-called hot water). An operation unit 28 for operating the water mist generating device 1 is provided inside the bathroom 3. The operation unit 28 can also perform operations such as storing water in the bathtub device 2 and setting the temperature. The operation unit 28 may also have functions such as setting the temperature of the supplied water mist and setting the particle size of the supplied water mist. The operation unit 28 may also be located outside the bathroom 3, or it may be a remote control or other remote control unit. The bathtub assembly 2 is provided with a water supply device 7. The bathtub assembly 2 also includes a bathtub body 6 that forms a retention space 4, which receives water mist supplied from the water mist supply unit of the water mist generating device 1 (described later).

[0065] The bathtub body 6 has a retaining space 4 that opens upwards toward the interior space 5 where the bathtub assembly 2 is mounted. The bathtub body 6 is a bathtub (basin) and water can be stored in the retaining space 4. Viewed from above, the bathtub body 6 is rectangular, with a long side portion 6d formed on the long side and a short side portion 6e formed on the short side. Compared to the long side portion 6d, the width of the bathtub in the short side portion 6e is shorter.

[0066] The retention space 4 is a roughly rectangular prism-shaped space formed inside the bathtub body 6. For example... Figure 2 As shown, when user A enters the bath, water B at a temperature of 34°C to 45°C is stored in the lower part of the retention space 4, allowing user A to bathe while seated. Furthermore, as described later, in Figure 2In this process, a state of water mist retention is formed above the water B in the retention space 4 (the state of water mist retention layer C). The retention space 4 is formed up to the upper end 6a of the bathtub body 6, and has an opening on the top side. As described later, the water mist can be retained in the retention space 4 even without a cover covering the top surface of the bathtub body 6. Alternatively, water mist can be retained in the retention space 4 without storing water B. The shape of the bathtub body 6 is not limited to a box shape as in the embodiment, as long as it is a shape that can form a retention space. For example, as viewed from above, the bathtub body 6 can also be formed as a circle or an ellipse, with a basin-shaped retention space formed on the inside. The bottom surface of the bathtub body 6 can also be sloped so that the user can adopt a posture close to a sleeping or sitting position, and a step may or may not be formed on the bottom surface. The top edge of the wall of the bathtub body 6 does not need to be formed at a fixed horizontal height; it can be formed so that the height varies. For example, when viewed from the side, the top edge of the wall of the bathtub body 6 can be in the shape of extending obliquely upward or downward, in the shape of extending in an arc shape with a portion concave downward, or in the shape of forming a roughly right angle.

[0067] The water mist generating device 1 is used in a water-using facility, namely a bathtub device 2. The water mist generating device 1 includes a water mist generating unit 8 that generates water mist and a water mist supply unit 10 that supplies water mist into the bathtub body 6.

[0068] The water mist generating unit 8 can generate water mist from heated water with controlled temperature, or generate temperature-controlled water mist by heating the water mist generated from water. The water mist generating unit 8 is disposed on the short side portion 6e of the short side of the bathtub body 6. A platform-shaped portion on the upper part of the short side portion 6e is formed where the water mist generating unit 8 is disposed.

[0069] The water mist generating unit 8 includes: a water tank 12 for storing water; a water supply line 14 for supplying water from a water source to the water tank 12; a drainage line 16 for draining water from the water tank 12 to a drain pipe; an ultrasonic vibrator 18 disposed on the bottom inner side of the water tank 12; a heater 20 disposed on the bottom inner side of the water tank 12; a water temperature detection unit, i.e., a water temperature measuring instrument 22, disposed on the inner side of the water tank 12; an air temperature detection unit, i.e., an indoor temperature measuring instrument 24, disposed on the outer side of the water tank 12; and a control unit 26 for controlling the ultrasonic vibrator 18 and the heater 20.

[0070] The water tank 12 is formed in a cuboid shape. A water supply passage 14 and a drainage passage 16 are connected to the lower side wall of the water tank 12. A water mist supply unit 10 is connected to the side wall near the center of the water tank 12. A water supply passage on / off valve 30 is provided on the water supply passage 14 to open and close the water supply passage 14. A drainage passage on / off valve 32 is provided on the drainage passage 16 to open and close the drainage passage 16.

[0071] The ultrasonic vibrator 18 can generate ultrasonic waves in the water within the water tank 12, causing the water surface to vibrate and form microparticles, thereby producing water mist (fog) of a specified particle size. The ultrasonic vibrator 18 is electrically connected to the control unit 26. By adjusting the ultrasonic oscillation output and frequency of the ultrasonic vibrator 18, the particle size of the generated water mist can be changed. The ultrasonic vibrator 18 can also be replaced with other devices capable of generating water mist of a specified particle size, such as a steam water mist generator, a pressure spray water mist generator, or an arc discharge water mist generator. Furthermore, although only one ultrasonic vibrator 18 is installed in the water tank 12 in this embodiment, multiple ultrasonic vibrators can also be installed in the water tank 12.

[0072] The control unit 26 has the function of heating the water in the water tank 12 via the heater 20, and also has the function of controlling the temperature of the water in the water tank 12. For example, the heater 20 can heat water at a supply temperature (e.g., room temperature of around 20°C) to 60°C or higher than room temperature. Furthermore, for example, after the water is temporarily heated to 60°C or higher by the heater 20, the control unit 26 can control the temperature of the water by raising or lowering it, so that the specified temperature difference described later is 0°C or higher. Therefore, the water mist generating unit 8 can generate water mist from the water heated to 60°C or higher while controlling the temperature of the water. Alternatively, the water mist generating unit 8 can generate water mist from the water supplied to the water mist generating unit 8 after it has been heated to 60°C or higher in the water heater. The water mist generating unit 8 has the function of heating the water in the water tank 12 to a temperature higher than room temperature and controlling it by setting a temperature, so that while adjusting the temperature of the water mist according to the state of the water mist particle size, etc., the water mist that generates an upward airflow at a temperature higher than room temperature is easily retained. Furthermore, since the water is heated to above 60°C, measures can be taken to inhibit the growth of at least some bacteria (such as Legionella). Alternatively, the step of temporarily heating the water (or water mist) to above 60°C by the heater 20 can be omitted, and other bacterial inhibition units, such as a UV light sterilization unit or a bacterial inhibition unit with added sterilizing agents, can be provided to replace this step. In this case, the heater 20 can heat the water (or water mist) to a temperature below 60°C.

[0073] Alternatively, the heater 20 can be positioned higher than the water level in the water tank 12 to heat the water mist generated from the water. In this case, the heater 20 can heat the water mist to 60°C or higher. Furthermore, for example, the control unit 26 can control the temperature of the water mist in the water tank 12 by raising or lowering the water level after the heater 20 has heated the water mist to 60°C or higher, so that the specified temperature difference described later is 0°C or higher. At this time, the water mist generating unit 8 heats the water mist generated from the water to 60°C or higher while simultaneously controlling the temperature of the heated water mist.

[0074] Alternatively, the heater 20 can be configured to heat water mist generated from water when it is positioned at a level lower than the water level in the water tank 12. In this case, a pipe can be provided from the water tank 12 to the heater 20 positioned at a level lower than the water level in the water tank 12, and the heater 20 can heat the water mist supplied to it through this pipe. The downstream side of this pipe is connected to the water mist supply unit 10 or the water tank 12, allowing the water mist heated by the heater 20 to return to the water mist supply unit 10 or the water tank 12.

[0075] The water temperature measuring instrument 22 detects the water temperature in the water tank 12. The control unit 26 is electrically connected to the water temperature measuring instrument 22 and can identify the water temperature in the water tank 12.

[0076] The indoor temperature measuring instrument 24 detects the temperature of the air outside the water tank 12 of the indoor space 5, where the bathtub body 6 is located. The control unit 26 is electrically connected to the indoor temperature measuring instrument 24, and thus the control unit 26 can identify the temperature of the air in the indoor space 5. In addition, since the temperature of the air in the indoor space 5 and the temperature of the air in the stagnant space 4 can be assumed to be approximately equal or close before the water mist supply begins (before the water mist generating unit 8 is activated), the control unit 26 can infer the temperature of the air in the indoor space 5 measured by the indoor temperature measuring instrument 24 as the temperature of the air in the stagnant space 4.

[0077] The control unit 26 has a built-in CPU and memory, and controls the connected devices based on a predetermined control program recorded in the memory to generate water mist. The control unit 26 is electrically connected to the ultrasonic vibrator 18, heater 20, water temperature measuring instrument 22, indoor temperature measuring instrument 24, and operation unit 28. The control unit 26 can also be electrically connected to the water supply line on / off valve 30 installed on the water supply line 14 and the drainage line on / off valve 32 installed on the drainage line for controlling them.

[0078] The water mist supply unit 10 supplies the water mist generated by the water mist generating unit 8 into the retention space 4, i.e., the bathtub body 6, which forms the retention space 4. The retention space 4 is open above the room where the bathtub body 6 is located. Figure 2As shown in the cross-section of the flow path, the water mist supply section 10 forms a flow path that extends linearly from the water mist generation section 8 to the upper part of one end of the retention space 4. Viewed from the front (from the retention space 4 side), the opening of the water mist supply section 10 is formed as a rectangle with a width of 6e along the short side portion 6e of the bathtub body 6. The opening is formed to have a width that spans approximately the entire short side portion 6e. The water mist supply section 10 is positioned above the water overflow portion 6c inside the bathtub body 6. In this embodiment, the overflow portion 6c is the overflow surface 6b of the bathtub body 6. As a variation, the overflow portion 6c may also be an overflow port provided inside the bathtub body 6. Furthermore, the water mist supply section 10 is positioned on the short side portion 6e of the short side of the bathtub body 6. A platform-shaped portion on which the water mist supply section 10 is positioned is formed at the upper part of the short side portion 6e. The water mist supply unit 10 sets the supply rate per volume, for example, within the range of 0.03 mL / min·L to 1.5 mL / min·L. For example, the water mist supply unit 10 can supply water mist at a rate of 11 mL / min per unit time to the 330 L retention space 4 of the bathtub body 6. Furthermore, for example, the water mist supply unit 10 can supply water mist at a rate of 6 mL / min per unit time to a 4.32 L retention space 4 used for measuring temperature differences and particle size, or other water-using equipment. The water mist supply rate can be controlled by the number of ultrasonic vibrators 18, their output, the direction of the ultrasonic waves, the water level in the water mist generation unit 8, or the flow path shape within the water mist generation unit 8 and the water mist supply unit 10.

[0079] The water mist generating unit 8 and the water mist supply unit 10 generate heated water mist while controlling the temperature of the water mist to make it easy for the water mist to remain in the retention space 4. This will be explained.

[0080] The water mist generating unit 8 and the water mist supply unit 10 are configured such that the temperature difference between the water mist supplied from the water mist supply unit 10 to the retention space 4 and the indoor temperature of the water-using area before the water mist supply begins is 0°C or higher, so that the water mist supplied from the water mist supply unit 10 remains in the retention space 4 of the bathtub body 6. Furthermore, the water mist generating unit 8 and the water mist supply unit 10 of the water mist generating device 1 are configured to generate a temperature difference such that the force of the rising airflow caused by the temperature difference does not exceed the temperature difference corresponding to the weight of the water mist droplets supplied from the water mist supply unit 10. This water mist supply can also be achieved by pre-setting the temperature of the water supplied to the water mist generating unit 8, the heating temperature of the heater 20, or the frequency of the ultrasonic vibrator 18, based on an assumed temperature range of the indoor space 5, without using the indoor temperature measuring instrument 24 (not dependent on the measurement results of the indoor temperature measuring instrument 24). Alternatively, this water mist supply can be achieved by adjusting the settings during supply. The water mist generating unit 8 and the water mist supply unit 10 are configured such that the temperature difference is preferably below 100°C, more preferably below 60°C, and even more preferably below 45°C. While generating water mist under heating conditions, the water mist generating unit 8 and the water mist supply unit 10 can control the particle size of the water mist so that the water mist can be easily retained in the retention space 4.

[0081] Next, through Figure 2 , Figures 3 to 8 The operation of the water mist generating apparatus of the first embodiment of the present invention described above will be explained.

[0082] exist Figures 3 to 8 In this design, the water mist generating device 1 is installed in the upper part of the bathtub body 6, which is considered to be an integral part of the bathtub body 6 of the bathtub device 2. Because... Figures 3 to 8 The basic structure of the water mist generating device 1 shown is similar to... Figure 2 The basic structure of the water mist generating device 1 shown is roughly the same, therefore in Figures 3 to 8 The text also includes a note about the relationship between the two. Figure 2 The same symbols are used for explanation.

[0083] like Figure 2 As shown, in the standby state before the water mist generating device 1 starts operating, water at approximately 38°C is stored in the lower half of the stagnation space 4 of the tank body 6. The air temperature in the indoor space 5 of the bathroom 3 is approximately equal to the air temperature in the stagnation space 4. The water supply valve 30 and the drain valve 32 are closed. The water tank 12 is empty. The ultrasonic vibrator 18 and the heater 20 are stopped.

[0084] The user operates the operation unit 28 to begin controlling the supply of water mist from the water mist generating device 1. Before the water mist supply begins, the indoor temperature measuring instrument 24 measures the temperature of the air in the indoor space 5, and the control unit 26 identifies the temperature of the air in the indoor space 5. The control unit 26 opens the water supply line on / off valve 30, supplying water from the water supply line 14 into the water tank 12. The drain line on / off valve 32 remains closed. When the water tank 12 contains a predetermined amount of water, the water supply line on / off valve 30 opens. Next, the control unit 26 activates the heater 20 to heat the water from the initial water supply temperature to above 60°C. After the water is heated to above 60°C, the control unit 26 adjusts the temperature of the water in the water tank 12 by starting and stopping the heater 20, so that the temperature difference between the water mist supplied from the water mist supply unit 10 to the stagnation space 4 and the temperature in the bathroom 3 where the bathtub device 2 is used before the water mist supply begins is above 0°C. Next, the control unit 26 activates the ultrasonic vibrator 18 to generate water mist inside the water tank 12.

[0085] exist Figure 3 The text indicates the state after water mist has just begun to be supplied from the water mist supply unit 10 to the stagnant space 4.

[0086] The water mist generated in the water tank 12 is supplied from the water mist supply section 10 to the retention space 4 within the bathtub body 6. The water mist naturally overflows from the water mist supply section 10, as shown by arrow F1, and is supplied to the retention space 4 while falling freely under its own weight. This suppresses the water mist from moving in any direction other than downwards. Consequently, the water mist is less likely to swirl, diffuse, or rise within the retention space 4.

[0087] exist Figure 4 The value in the middle indicates the state approximately 10 seconds after the water mist supply begins.

[0088] Water mist continues to be supplied from the water mist supply unit 10 to the stagnant space 4. The supplied water mist initially stagnates above the surface of water B and in the lower part of the stagnant space 4. Since the temperature difference between the water mist supplied from the water mist supply unit 10 to the stagnant space 4 and the temperature of the indoor space 5 of the bathtub device 2 before the water mist supply begins is 0°C or more, the water mist is unlikely to generate an upward airflow sufficient to overcome its own weight due to its temperature. Therefore, the water mist stagnates in the lower part of the stagnant space 4.

[0089] exist Figure 5 The text indicates the state approximately 30 seconds after the water mist supply begins.

[0090] Continue to supply water mist from the water mist supply unit 10 to the stagnation space 4. The amount of water mist supplied to the stagnation space 4 gradually increases, and the water mist gradually stagnates in the higher part of the stagnation space 4.

[0091] exist Figure 6 The text indicates the state approximately one minute after the water mist supply began.

[0092] Continue to supply water mist from the water mist supply unit 10 to the stagnation space 4. The amount of water mist supplied to the stagnation space 4 gradually increases, and the water mist stagnates in a higher part of the stagnation space 4.

[0093] exist Figure 7 The text indicates the state approximately 1 minute and 30 seconds after the water mist supply began.

[0094] Water mist continues to be supplied from the water mist supply section 10 to the retention space 4. The amount of water mist supplied to the retention space 4 further increases, and the water mist is retained to a portion near the top of the retention space 4 (the upper end 6a of the bathtub body 6).

[0095] exist Figure 8 The text indicates the state approximately 2 minutes after the water mist supply began.

[0096] Water mist continues to be supplied from the water mist supply unit 10 to the retention space 4. The water mist supplied to the retention space 4 is retained near the top of the retention space 4 (the upper end 6a of the bathtub body 6). The water mist is mainly retained in the area above the water surface of water B and below the top of the retention space 4. Some of the water mist falls to water B and is absorbed, or forms droplets and adheres to the wall of the bathtub body 6, or flows out beyond the edge of the upper end 6a of the bathtub body 6. Thus, although some of the water mist disappears or diffuses, the main water mist remains in the retention space 4. That is, while the water mist flows slowly in the retention space 4, it does not diffuse out of the retention space 4, thus forming a stable retention layer C. The retention layer C is formed above the water surface of water B by the presence of water mist with a certain or higher density in a unit space. The retention layer is identified as a white cloud-like structure. The retention layer is formed such that the density of water mist is higher on the lower side and lower on the upper side. Due to the presence of the retention layer, it can be visually perceived that the retention space 4 is filled with water mist up to the top.

[0097] The retention boundary surface 66 on the upper side of the retained water mist is formed below the height position M1, which is the height of the overflow surface 6b of the bathtub body 6 (height position M0) plus the height corresponding to the depth L1 of the bathtub body 6. The retention boundary surface 66 represents the boundary region between the retention layer C where the water mist concentration in the air is above a certain level and the air layer J where the water mist concentration in the air is below a certain level. Since the retention boundary surface 66 moves to some extent while retaining water mist, it is defined as a region with a slight height in the vertical direction and as a region that expands in the horizontal direction. In addition, the overflow surface 6b of the bathtub body 6 is the lowest part of the side wall of the bathtub body 6, that is, the part that initially overflows when water accumulates to the upper limit of the bathtub body 6.

[0098] Furthermore, the retention boundary surface 66 on the upper side of the retained water mist is formed higher than the height position M0 of the overflow surface 6b of the bathtub body 6. Also, the retention boundary surface 66 on the upper side of the retained water mist is formed lower than the height of the overflow surface 6b of the bathtub body 6 (height position M0) plus a value between 100mm and 200mm (height position M2 to height position M3). When the retention boundary surface 66 is located at a position higher than the height of the overflow surface 6b of the bathtub body 6, the user can obtain a mist bath effect extending beyond the bathtub, that is, a hot bath effect extending to a height higher than the bathtub. During the operation (use) of the water mist generating unit 8, water mist is supplied into the bathtub body 6, and the retention of water mist continues.

[0099] The water mist generating unit 8 and the water mist supply unit 10 are configured to specify the temperature difference between the water mist and the indoor temperature, the particle size of the water mist, and the supply amount of water mist, so that the height position of the retention boundary surface 66 is the height position specified above.

[0100] Next, refer to Figures 9 to 11 The measurement methods for the temperature of the water mist supplied from the water mist supply unit 10 to the stagnant space 4 and the indoor temperature of the bathtub device 2 before the water mist supply begins are explained.

[0101] The temperature of the water mist supplied from the water mist supply unit 10 to the retention space 4 can be measured by a box-shaped device 35 corresponding to the shape of a hypothetical water-using facility. The box-shaped device 35 includes: a hypothetical retention space 34, simulating the shape of the retention space of a hypothetical water-using facility; and a K thermocouple 36, which is disposed in the center of the hypothetical retention space 34 and measures the temperature.

[0102] The hypothetical dwelling space 34 is formed by miniaturizing the actual dwelling space 4 while mimicking its shape. The size and shape of the hypothetical dwelling space can be determined based on the hypothetical water-using equipment, and are determined in a manner corresponding to the size and shape of a bathtub in the case of bathtub device 2, a bathroom floor, a shower room, a washbasin in the case of washbasin, a kitchen sink in the case of kitchen, etc. Viewed from above, the hypothetical dwelling space 34 is, for example, formed as a rectangle with a short side of 120mm and a long side of 300mm; viewed from the front, it is formed as a cuboid with a height of 120mm and a long side of 300mm. The top surface of the hypothetical dwelling space 34 of the box-shaped device 35 is omitted, leaving an opening. At the center of this hypothetical dwelling space 34, a temperature-sensing part of a K thermocouple 36 is arranged to measure the temperature of the air inside the hypothetical dwelling space 34. As observed above, thermocouple K 36 is located 60 mm inward from the sidewall along its short side, 150 mm inward from the sidewall along its long side, and 60 mm upward from the bottom in its height direction. For example, the sensing element of thermocouple K has the following dimensions: Thermocouple 36 (K) is electrically connected to a temperature recorder (not shown). For example, the temperature recorder (KEYENCE, NR-500 series NR-TH08) is used to measure and record the data from thermocouple 36 (AS ONE, model L-TN-4-K), and the information from the temperature recorder is recorded to a computer. Furthermore, the source water for generating the water mist is tap water, and the water quality is based on the tap water quality. Also, the room where each measurement method is performed is not supplied with air conditioning or other ventilation that would cause airflow.

[0103] like Figure 12 As shown, the temperature of the water mist supplied from the water mist supply unit 10 to the retention space 4 can be defined by the water mist atmosphere temperature T1 (e.g., 43°C). The water mist atmosphere temperature T1 is the highest temperature at which the temperature rise substantially stops after a sufficient time (e.g., 2500 (S)) has elapsed since the water mist supply unit 10 of this embodiment begins to supply water mist to the imaginary retention space 34 in the box-shaped device 35.

[0104] exist Figure 12 In the diagram, the vertical axis represents the temperature (water mist atmosphere temperature) measured by thermocouple 36 within the hypothetical confinement space 34 (°C), and the horizontal axis represents the elapsed time (s) from the start of the measurement. Figure 12The example shown illustrates a measurement of the water mist atmosphere temperature. In this example, the initial indoor temperature is T0 = -5°C, and the initial water mist temperature generated at the water mist generation unit 8 is 60°C. The water mist supplied from the water mist supply unit 10 to the stagnation space is at a slightly lower temperature, which can be determined by measuring the water mist atmosphere temperature. After the water mist supply begins, the temperature within the hypothetical stagnation space 34 rises over time, converging to a roughly constant value T1. As water mist continues to be supplied from the water mist supply unit 10, the convergence value of the water mist temperature within the hypothetical stagnation space 34 is the same as the temperature of the water mist supplied from the water mist supply unit 10 to the hypothetical stagnation space 34. Therefore, the temperature of the water mist actually supplied from the water mist supply unit 10 to the stagnation space 4 can be assumed to be the temperature of the water mist obtained in the hypothetical stagnation space 34 (water mist atmosphere temperature).

[0105] Next, the method for measuring the indoor temperature of the water-using facility before water mist supply begins will be explained. The indoor temperature of the water-using facility before water mist supply begins can be measured by a room temperature thermocouple 50 located outside the imaginary confinement space 34, which is placed inside the water-using facility. The room temperature thermocouple 50 is placed in the same indoor space as the box-shaped device 35 to simulate the indoor temperature measuring instrument 24. Therefore, the temperature measured by the room temperature thermocouple 50 corresponds to the indoor temperature measured by the indoor temperature measuring instrument 24. When using a simulation such as an imaginary confinement space, the temperature measured by the room temperature thermocouple 50 can be used as the indoor temperature. The room temperature thermocouple 50 is positioned at the top height of the imaginary confinement space 34, and when viewed from above, it is located 60 mm outward from the side wall along the short side and 150 mm inward from the side wall at one end of the imaginary confinement space 34 along the long side. A room temperature thermocouple 50 is fixed to the outside of the imaginary confinement space 34 via a support 38 extending outward. The indoor temperature of the water-using facility can be measured using the room temperature thermocouple 50 before water mist is supplied to the imaginary confinement space 34. The room temperature thermocouple 50 uses the same type of thermocouple as the thermocouple 36 within the imaginary confinement space. The room temperature thermocouple 50 is not limited to this location and can also be positioned outside and near the water mist generating unit 8. Furthermore, since the room temperature thermocouple 50 only needs to measure the indoor temperature of the water-using facility before water mist supply begins, the air temperature within the imaginary confinement space 34 before water mist supply can also be measured using the thermocouple 36 positioned within the imaginary confinement space 34.

[0106] Next, refer to Figure 13The range of temperature difference between the temperature of the water mist supplied from the water mist supply unit 10 to the stagnant space 4 and the indoor temperature of the equipment in the water-using area before the water mist supply begins (by... Figure 13 The dotted area in the diagram is used for explanation.

[0107] As described above, the temperature of the water mist supplied from the water mist supply unit 10 to the stagnant space 4 and the indoor temperature of the water-using area equipment before the water mist supply begins can be specified. Therefore, the temperature difference between the temperature of these water mists and the indoor temperature can be specified. Since this temperature difference is above 0°C, the temperature of the water mist adjusted after heating is set to be the same as or higher than the room temperature before the water mist supply begins.

[0108] exist Figure 13 In the diagram, the vertical axis represents the temperature of the water mist (°C), and the horizontal axis represents the indoor temperature (°C). Line C1 represents the point where the temperature difference between the water mist and the indoor temperature is 0°C. Therefore, the range with a temperature difference above 0°C is shown above line C1. Furthermore, in... Figure 13 In the diagram, line C2 represents a temperature difference of 100°C between the temperature of the water mist and the room temperature. The water mist generating unit 8 and the water mist supply unit 1 of the water mist generating device 1 are configured such that the temperature difference is between 0°C and 100°C. Since the temperature of the water mist can be set to a higher temperature up to 100°C, when the water mist is used to clean the bathtub body 6 of the water-using equipment, the cleaning performance of the water mist can be improved, and the ability to remove dirt can be facilitated. For example, using high-temperature water mist close to the boiling point of water can achieve higher cleaning performance. In addition, since the water mist changes in the form of water vapor when it is at the boiling point (e.g., 100°C), causing the water mist particles to disappear, the temperature of the water mist supplied from the water mist supply unit 10 is below 100°C (represented by the area below line C5).

[0109] Furthermore, the water mist generating unit 8 and the water mist supply unit 1 of the water mist generating device 1 are configured such that the temperature difference is above 0°C and below 60°C. Line C3 indicates that the temperature difference between the water mist and the room temperature is 60°C. By suppressing the use of water mist at a relatively high temperature of 60°C, when using water mist for cleaning the bathtub body 6 in water-using facilities, the possibility of scalding can be further reduced while improving the cleaning effectiveness of the water mist.

[0110] Furthermore, the water mist generating unit 8 and the water mist supply unit 1 of the water mist generating device 1 are configured such that the aforementioned temperature difference is above 0°C and below 45°C. Line C4 indicates that the temperature difference between the water mist and the indoor temperature is 45°C. By using water mist at a lower temperature with a temperature difference of up to 45°C, the possibility of users of water-using facilities being scalded by water mist can be largely eliminated.

[0111] In addition, Figure 13If the temperature of the water mist is set to above 35 degrees Celsius (represented by line D1) and below 45 degrees Celsius (represented by line D2), the possibility of the user being scalded by the water mist can be largely eliminated while setting it to the user's body temperature or a temperature hotter than body temperature.

[0112] Next, refer to Figure 14 The apparatus and method for measuring the particle size of the water mist supplied from the water mist supply unit 10 are described.

[0113] The water mist particle size measuring device 37 includes: a box-shaped device 39 having an imaginary retention space 34 of the same size and shape as described above; and a particle size distribution measuring device 53. On the side wall of the box-shaped device 39, that is, near the center of the side wall of the imaginary retention space 34, a square opening 52 of 20mm × 20mm is formed, and a cover 55 is installed on the opening 52.

[0114] like Figure 15 As shown, the particle size distribution measuring device 53 includes a particle size measuring laser 54, which is configured such that its measuring area E is located near and facing the opening 52. As viewed above, the particle size measuring laser 54 is configured such that its laser beam is parallel to the long side of the imaginary retention space 34. The measuring area E through which the laser beam emitted from the particle size measuring laser 54 passes is located facing the opening 52. The measuring area 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 scattering of the laser beam.

[0115] With the cover 55 installed over the opening, water mist is supplied into the imaginary retention space 34. The water mist supply port of the water mist supply unit 10 is not shown in the diagram. One minute after the start of water mist supply, the cover 55 is opened, allowing the water mist to leak towards the measurement area E of the particle size measuring laser 54. The scattered light distribution is measured through the measuring lens 56 when the transmittance of the particle size measuring laser 54 is between 60% and 90%. For example, the particle size measuring laser 54 and the measuring lens 56 are the Aerotrac LDSA-SPR1500A of the spray particle size distribution measuring device manufactured by Microtrac BEL Co., Ltd. The particle size distribution data is measured 10 times and recorded on a PC. The 10 particle size distribution data are averaged on the PC. Figure 16 In this example, we have particle size distribution data measured by particle size distribution measuring device 53. Figure 16In the diagram, the left vertical axis represents frequency (%), the right vertical axis represents cumulative (%), and the horizontal axis represents particle size (μm). For example, PC analyzes the particle size distribution data obtained in this way to obtain the 20% percentage particle size G and the Sauder mean particle size H of the particle size distribution data. The Sauder mean particle size represents the particle size with a surface area-to-volume ratio that is the same as the total volume of all particles relative to the total surface area of ​​all particles. By calculating the mean particle size from the Sauder mean particle size, the influence of a few particles with large particle sizes on the measured value can be suppressed.

[0116] The water mist generating unit 8 is configured such that most of the water mist supplied from the water mist supply unit 10 has a particle size of 3.1 μm or more and 40 μm or less. Since the measurement is less susceptible to the influence of a few large or small particles within this upper and lower limits, the particle size of the water mist is specified to satisfy the following conditions: the Sodt average particle size of the water mist is 40 μm or less, and the Sodt average particle size of the water mist is 3.1 μm or more.

[0117] The water mist generating unit 8 is configured such that most of the water mist supplied from the water mist supply unit 10 has a particle size of 3.6 μm or more and 20 μm or less. Since the measurement is less susceptible to the influence of a few large or small particles within this upper and lower limits, the particle size of the water mist is specified to satisfy the following conditions: the Sodt average particle size of the water mist is 3.6 μm or more, and the Sodt average particle size of the water mist supplied from the water mist supply unit is 20 μm or less.

[0118] The water mist generating unit 8 is configured such that most of the water mist supplied from the water mist supply unit 10 has a particle size of 4.1 μm or more and 10 μm or less. Since the water mist is less susceptible to the influence of a few large or small particles within this upper and lower limits, the particle size of the water mist is specified to satisfy the condition that the Sotter average particle size of the water mist is 4.1 μm or more and 10 μm or less.

[0119] Next, refer to Figure 17 The relationship between temperature difference and particle size is explained.

[0120] exist Figure 17 In the graph, the vertical axis represents particle size (μm), and the horizontal axis represents temperature difference ΔT (°C). Figure 17 In the diagram, the preferred ranges of these particle sizes and temperature differences ΔT are represented by linear regions. Through the water mist generation unit 8 and the water mist supply unit 10, a predetermined temperature difference can be set within a range where the temperature difference between the water mist and the room temperature is 0°C or higher and 100°C or lower. Similarly, the temperature difference can be changed to 0°C or higher and 60°C or lower, 0°C or higher and 45°C or lower, etc.

[0121] The water mist generating unit 8 and the water mist supply unit 10 are configured such that the Soter average particle size of the water mist is 40 μm or less. Therefore, most of the water mist particles have a diameter of 40 μm or less.

[0122] Furthermore, assuming the water mist particle size is 40 μm, the terminal velocity v can be calculated to be 45.3 mm / s. The calculation method for the terminal velocity v of the water droplets can be expressed as follows: When the molecular viscosity coefficient of air is μ and the radius of the water droplet (half the particle size of the water mist) is r, from ρ = 10³ kg / m³... -3 g = 9.8 m / s 2 μ = 1.8 x 10 -5 N·sec / m 2 (15℃) can be obtained

[0123]

[0124] The terminal velocity v(∞) is proportional to the square of the droplet radius. Furthermore, this formula is applicable in the range Re < 1, i.e., r < 0.1 mm.

[0125] Given that the water mist particle size is 40 μm and the terminal velocity of the water mist is 45.3 mm / s, it can be assumed that the supplied water mist reaches the bottom of the retention space (e.g., 45 cm from the bottom of the water mist supply section 10 to the retention space 4) within 10 seconds, and then disappears. That is, the water mist remains for at least 10 seconds from the time it is supplied until it disappears. Therefore, if the water mist remains for approximately 10 seconds, it can be further supplied during this period, thus facilitating the maintenance of the water mist retention layer C. Figure 17 In the case where the average particle size of the Sotter is greater than 40 μm, the average time until the water mist disappears becomes shorter, so it is not easy to form a water mist retention layer due to the disappearance of the water mist.

[0126] The water mist generation unit 8 and the water mist supply unit 10 can also be configured such that the Soter average particle size of the water mist is 20 μm or less. At this time, most of the water mist particles have a diameter of 20 μm or less. Assuming that the water mist particle size is 20 μm, the terminal velocity v can be calculated to be 11.3 mm / s. It takes at least approximately 40 seconds for the supplied water mist to reach the bottom of the retention space, thus further reducing the proportion of water mist that falls to the bottom of the retention space 4 earlier.

[0127] The water mist generation unit 8 and the water mist supply unit 10 can also be configured such that the Sotter average particle size of the water mist is 10 μm or less. At this time, most of the water mist particles have a diameter of 10 μm or less. Assuming that the water mist particle size is 10 μm, the terminal velocity v can be calculated to be 2.8 mm / s. It takes at least approximately 160 seconds for the supplied water mist to reach the bottom of the retention space 4, thereby further extending the duration of the water mist remaining in the retention space 4 and further reducing the proportion of water mist falling to the bottom of the retention space 4 earlier.

[0128] The water mist generating unit 8 and the water mist supply unit 10 can also be configured such that the Soter average particle size of the water mist is 3.1 μm or more. At this time, most of the water mist particles have a diameter of 3.1 μm or more. This can reduce the proportion of water mist supplied from the water mist supply unit 10 that diffuses out of the retention space 4 without remaining in it, while increasing the proportion of water mist remaining in the retention space 4, thereby effectively retaining the water mist in the retention space 4.

[0129] The water mist generating unit 8 and the water mist supply unit 10 can also be configured such that the Soter average particle size of the water mist is 3.6 μm or more. At this time, most of the water mist particles have a diameter of 3.6 μm or more. This can further reduce the proportion of water mist supplied from the water mist supply unit 10 that does not remain in the retention space 4 and diffuses out of the retention space 4, while increasing the proportion of water mist remaining in the retention space 4, thereby more effectively retaining the water mist in the retention space 4.

[0130] The water mist generating unit 8 and the water mist supply unit 10 can also be configured such that the Soter average particle size of the water mist is 4.1 μm or more. At this point, most of the water mist particles have a diameter of 4.1 μm or more. This further reduces the proportion of water mist supplied from the water mist supply unit 10 that diffuses out of the retention space 4 without remaining there, while further increasing the proportion of water mist remaining in the retention space 4, thereby further effectively retaining the water mist in the retention space 4.

[0131] Next, refer to Figure 18 and Figure 19 The relationship between temperature difference, particle size, and the state of water mist within the hypothetical retention space 58 is further explained. Figure 18 A box-shaped observation device used to observe the state of a person within a hypothetical space. Figure 19 In this study, the state of water mist within a hypothetical retention space 58 was compared and illustrated for nine combinations of temperature difference and Sotter average particle size.

[0132] like Figure 19As shown, the state of water mist within the hypothetical retention space 58 can be measured using a box-shaped observation device 55 that corresponds to the shape of a hypothetical water-using facility. The box-shaped observation device 55 includes a hypothetical retention space 58 simulating the shape of a hypothetical water-using facility's retention space, and a camera 62 for observing and recording the water mist within the hypothetical retention space 58. Figure 18 As shown in the perspective view, the imaginary confinement space 58 of the box-shaped observation device 55 is formed as a cuboid with a short side of 120 mm, a long side of 300 mm, and a height of 240 mm. The top surface of the imaginary confinement space 58 is omitted, and it opens upwards. One side wall of the imaginary confinement space 58 of the box-shaped observation device 55 is formed by a transparent plate 60, so that the interior of the imaginary confinement space 58 can be observed and recorded by a camera 62 positioned diagonally above the box-shaped observation device 55. At a height of 120 mm on the side wall of the imaginary confinement space 58 on the short side of the box-shaped observation device 55, a supply port 64 with a width of 70 mm and a height of 40 mm is formed. This supply port 64 is connected to the water mist supply unit 10.

[0133] exist Figure 19 In this process, water mist of a specified particle size and temperature difference is supplied from the water mist supply unit 10. The retention state is photographed using camera 62, and the photographs are compared and represented using nine patterns. In each pattern photograph, as a reference, the position where a retention boundary surface is assumed to be generated is indicated by a dashed line.

[0134] exist Figure 19 In the figure, the vertical axis represents the Soter average particle size of the water mist supplied from the water mist supply unit 10, and the horizontal axis represents the temperature difference ΔT between the water mist temperature and the indoor temperature.

[0135] exist Figure 19 In Figure A, when the Sotter average particle size of the water mist is 50 μm to 60 μm and the temperature difference is 5°C (the water mist temperature is 20°C and the indoor temperature before the water mist supply begins is 15°C), the water mist supplied from the water mist supply unit 10 falls rapidly towards the bottom and disappears within the imaginary retention space 58. Therefore, the water mist is not retained within the imaginary retention space 58. This photograph was taken 2 minutes after the water mist supply began. Therefore, within the imaginary retention space 58, there is no retention layer C of water mist with a retention boundary surface 66 formed on it.

[0136] exist Figure 19 In Figure B, when the average particle size of the water mist is 50μm to 60μm and the temperature difference is 25℃ (the temperature of the water mist is 40℃ and the indoor temperature before the water mist is supplied is 15℃), the water mist supplied from the water mist supply unit 10 falls towards the bottom and disappears quickly in the imaginary retention space 58, so the water mist is not retained in the imaginary retention space 58.

[0137] exist Figure 19 In Figure C, when the average particle size of the water mist is 50μm to 60μm and the temperature difference is 45℃ (the temperature of the water mist is 60℃ and the indoor temperature before the water mist is supplied is 15℃), the water mist supplied from the water mist supply unit 10 falls towards the bottom and disappears relatively quickly in the imaginary retention space 58, so the water mist is not retained in the imaginary retention space 58.

[0138] exist Figure 19 In Figure D, when the Sotter average particle size of the water mist is 4μm to 8μm and the temperature difference is 5°C (the water mist temperature is 20°C and the indoor temperature before the water mist supply begins is 15°C), the water mist supplied from the water mist supply unit 10 in the imaginary retention space 58 is slightly less concentrated but forms a retention layer C. Because the water mist particle size is small, the terminal velocity is also small, and the falling speed is slow. On the other hand, the updraft generated by the temperature difference is also small. Therefore, while the water mist is retained, a retention layer of water mist with a retention boundary surface 66 formed on its surface is formed in the imaginary retention space 58.

[0139] exist Figure 19 In Figure E, when the Sotter average particle size of the water mist is 4 μm to 8 μm and the temperature difference is 25°C (the water mist temperature is 40°C and the indoor temperature before the water mist supply begins is 15°C), the water mist supplied from the water mist supply unit 10 forms a high-concentration retention layer C within the imaginary retention space 58. Because the water mist particle size is small, the terminal velocity is also small, and the falling speed is slow. Some updrafts generated by the temperature difference are also produced. Here, the updrafts generated by the temperature difference ensure that the force causing the water mist to rise does not exceed the weight of the water mist, and also suppress the falling of the water mist, thus resulting in a longer retention time for the water mist. Therefore, within the imaginary retention space 58, a retention layer C of water mist with a retention boundary surface 66 formed on its surface is formed.

[0140] exist Figure 19In Figure F, when the Sotter average particle size of the water mist is 4μm to 8μm and the temperature difference is 45°C (the water mist temperature is 60°C and the indoor temperature before the water mist supply begins is 15°C), the water mist supplied from the water mist supply unit in the imaginary retention space 58 forms a high-concentration retention layer C. Because the water mist particle size is small, the terminal velocity is also small, and the falling speed is slow. Furthermore, compared to the case with a temperature difference of 25°C, the updraft generated by the temperature difference becomes slightly stronger. However, the force of the updraft generated by the temperature difference causing the water mist to rise still does not exceed the weight of the water mist, and it suppresses the falling of the water mist, thus resulting in a longer retention time for the water mist. Although due to the slightly stronger updraft, there are localized areas where water mist floats from the retention layer C, the overall retention layer C of the water mist is maintained. Therefore, a retention layer of water mist with a retention boundary surface 66 formed on its surface is formed in the imaginary retention space 58. Although there are localized areas where water mist rises, the presence of a retention boundary 66 in more than half of the hypothetical retention space 58 also constitutes the formation of a retention boundary 66.

[0141] exist Figure 19 In Figure G, when the Sotter average particle size of the water mist is 1.2 μm and the temperature difference is 5°C (the water mist temperature is 20°C and the indoor temperature before the water mist supply begins is 15°C), the water mist supplied from the water mist supply unit 10 diffuses in a floating manner within the imaginary retention space 58. The updraft generated by the temperature difference is relatively small. However, because the water mist particle size is smaller, the terminal velocity is smaller, and the falling velocity becomes slower. Therefore, the water mist is lighter and diffuses through a weak updraft. Consequently, a retention layer C of water mist with a retention boundary surface 66 formed on it is not formed within the imaginary retention space 58.

[0142] exist Figure 19 In Figure H, when the Sotter average particle size of the water mist is 1.2 μm and the temperature difference is 25°C (the water mist temperature is 40°C and the indoor temperature before the water mist supply begins is 15°C), the water mist supplied from the water mist supply unit 10 diffuses in a floating manner within the hypothetical retention space 58. Because the water mist particle size is smaller, the terminal velocity is also smaller, and the falling speed becomes slower. Furthermore, the updraft generated by the temperature difference becomes stronger. Therefore, the water mist is lighter and diffuses through the stronger updraft. Consequently, a retention layer C of water mist with a retention boundary surface 66 formed on its surface is not formed within the hypothetical retention space 58.

[0143] exist Figure 19In Example I, when the average particle size of the water mist is 1.2 μm and the temperature difference is 45°C (the temperature of the water mist is 60°C and the indoor temperature before the water mist supply begins is 15°C), the water mist supplied from the water mist supply unit 10 diffuses in a floating manner within the hypothetical retention space 58. Because the water mist particle size is smaller, the terminal velocity is also slower, and the falling velocity becomes even slower. Furthermore, the updraft generated by the temperature difference becomes even stronger. Therefore, the water mist is lighter and diffuses further due to the stronger updraft. Consequently, a retention layer C of water mist with a retention boundary surface is not formed within the hypothetical retention space 58.

[0144] Next, refer to Figure 20 The device and method for determining whether water mist is in a stagnant state (whether a stagnant layer C of water mist is formed on the stagnant boundary surface 66) in the stagnant space 4 (or imaginary stagnant space, etc.) within the bathtub body 6 are stagnant (is a stagnant layer C of water mist formed on the stagnant boundary surface 66 formed on it) are explained.

[0145] Will as Figure 20 The transmittance measuring device 68 is used to compare the internal transmittance measured inside the retention space 4 within the bathtub body 6 with the external transmittance measured outside the retention space 4. If the internal transmittance is lower than the external transmittance, it can be determined that water mist is retained inside the retention space 4. More specifically, when the internal transmittance / external transmittance < 1, it is determined that water mist is retained inside the retention space 4.

[0146] For example, such as Figure 19 As shown in Figure E, when water mist is retained inside the retention space 4, the internal transmittance decreases. On the other hand, since the water mist mainly remains inside the retention space 4, the external transmittance measured above the retention boundary 66 is higher. Therefore, an internal transmittance / external transmittance ratio < 1 is considered to indicate that water mist is retained inside the retention space 4.

[0147] like Figure 19 As shown in Figure A, when there is no water mist trapped inside the retention space 4, and the water mist mainly falls and disappears, both the internal and external transmittance remain at high values. Therefore, the internal transmittance / external transmittance = 1, and it will not be determined that water mist is trapped inside the retention space 4.

[0148] like Figure 19 As shown in Figure I, when water mist diffuses from the inside of the retention space 4 to the outside, the internal transmittance and the external transmittance can be considered to be the same value with slightly lower transmittance. Therefore, the internal transmittance / external transmittance = 1, and it will not be determined that water mist is retained inside the retention space 4.

[0149] Next, refer to Figure 20The apparatus 68 for measuring transmittance will be described.

[0150] The transmittance measuring device 68 includes: a first laser device 70 disposed inside the retention space 4; and a first transmittance measuring device 72 for receiving the laser light. The first laser device 70 and the first transmittance measuring device 72 are positioned 150 mm downwards from the upper end of the retention space 4 (for example, at a depth of approximately 30% of the depth of the retention space 4), and are 150 mm away horizontally. Under top-view observation, the first laser device 70 and the first transmittance measuring device 72 are positioned near the center of the retention space 4. Transmittance is measured by comparing the intensity of the laser light emitted from the first laser device 70 with the intensity of the laser light emitted from the first laser device 70 as measured by the first transmittance measuring device 72.

[0151] The transmittance measuring device 68 further includes: a second laser device 74 disposed outside the retention space 4; and a second transmittance measuring device 76 for receiving the laser light. The second laser device 74 and the second transmittance measuring device 76 are positioned 150 mm upwards from the upper end of the retention space 4 (for example, symmetrical to the first laser device 70 and the first transmittance measuring device 72 relative to the upper end of the retention space 4), and are 150 mm apart horizontally. Under top-view observation, the second laser device 74 and the second transmittance measuring device 76 are positioned near the center of the retention space 4. Transmittance is measured by comparing the intensity of the laser light emitted from the second laser device 74 with the intensity of the laser light emitted from the second laser device 74 as measured by the second transmittance measuring device 76. Furthermore, although the transmittance measuring device 68 arranges the first laser device 70 and the first transmittance measuring device 72 inside the dwell space 4, these devices can also be arranged in the above-mentioned imaginary dwell space instead of the dwell space 4, and the transmittance prediction measurement can be performed hypothetically. At this time, the second laser device 74 and the second transmittance measuring device 76 can be arranged outside the imaginary dwell space.

[0152] More specifically, the device involves exciting a laser emitted from a KEYENCE FS-N11MN digital fiber amplifier using a KEYENCE FU-77TZ (first laser device 70 or second laser device 74), and then receiving it using a KEYENCE FU-77TZ (first transmittance measuring device 72 or second transmittance measuring device 76). The received light is returned to the FS-N11MN fiber amplifier, and a voltage output of 1-5V is generated based on the light intensity. The output voltage is measured using a KEYENCE NR-500 series NR-HA08 and scaled to 0-100% on a PC. Transmittance data is measured, for example, with a sampling period of 100ms. For example, it is calculated by averaging the transmittance data over a 30-second period within 15 minutes after the water mist is initially supplied in a roughly quantitative manner, during which a stable state can initially be determined.

[0153] Next, refer to Figure 21 and Figure 22 The differences in how heat is transferred to the user in a mist bath versus a regular tub bath are explained.

[0154] exist Figure 21 The vertical axis represents the time elapsed for the following heat fluxes: the heat flux transferred from water to the user when bathing in the bathtub body 6 of the bathtub device 2 with 40°C water added to the normal bathing water level (the water level above the user's armpits and below their shoulders, for example, 450mm during bathing); the heat flux transferred to the user when taking a mist bath with the same bathtub body 6 filled with 40°C water mist (water mist atmosphere); the heat flux transferred to the user when taking a mist bath with the same bathtub body 6 filled with 43°C water mist (water mist atmosphere); and the heat flux transferred to the user when taking a mist bath with the same bathtub body 6 filled with 45°C water mist (water mist atmosphere). The vertical axis represents the heat flux (W / m²). 2 The horizontal axis represents the time (s) from the start of bathing. Heat flux (W / m²) 2 The measuring unit is positioned on the center of the back of an average-sized user to measure the heat flux conducted to the user. The water mist atmosphere indicates the state in which the bathtub body 6 is filled with sufficient water mist.

[0155] When a user takes a bath in 40°C water starting at time 0 (s), the heat flux initially increases sharply. Therefore, the user experiences greater thermal stimulation at the start of the bath. On the other hand, in the case of a mist bath, the initial increase in heat flux is more suppressed, and it increases slowly. Therefore, the user experiences less thermal stimulation at the start of the bath compared to a tub bath.

[0156] Furthermore, when a user takes a bath in 40°C water, the heat flux is lower when taking a mist bath in 40°C water compared to when taking a bath in 40°C water, resulting in a lower perceived temperature for the user. A mist bath in 40°C water can slowly heat the user's body with less stimulation.

[0157] In addition, such as Figure 21 As shown, the heat flux acting on the user is the same whether the user takes a bath in water at 40°C or a mist bath in water at 43°C. Figure 22 The results show that the user's skin temperature was measured after 10 minutes of bathing or misting. It was found that the user experienced roughly the same level of heating when bathing in 40°C water and when misting in 43°C water. Thus, misting suppresses the initial stimulation of heated water, resulting in a more beneficial bathing experience. For example, when bathing in 43°C water, the user feels extremely hot and can only bathe for a short time. However, when misting in 43°C water, the user feels a slightly lower temperature and can soak for a longer period compared to water at the same temperature. Furthermore, because the mist provides a slightly lower perceived temperature compared to water, it heats the user's body more slowly, reducing the burden on the body caused by heating. Additionally, misting places less pressure on the user's body, unlike the pressure exerted by water, allowing for longer misting sessions. Furthermore, according to the mist bath, it can give users the visual effect of the water surface being covered by water mist, like an open-air bath, thus bringing users a sense of luxury and a healing effect.

[0158] Next, the effects obtained by the configuration of this embodiment will be explained.

[0159] In the first embodiment of the present invention configured as described above, the water mist generating unit 8 and the water mist supply unit 10 are configured such that the water mist supplied from the water mist supply unit 10 is retained in the retention space 4 of the bathtub body 6. Therefore, water mist in a heated state can be retained in the open retention space 4 above the bathtub body 6. Since the water mist can be retained in the open retention space 4 above the bathtub body 6 without a cover, the need for a user cover is eliminated, improving convenience. Furthermore, since the user can use the water mist to heat the bathtub body 6 without a cover, user comfort is also improved. In addition, since the user can use the water mist to heat the bathtub body 6, there is no feeling of pressure compared to immersing in water, allowing for a mist bath with reduced physical burden. Moreover, since the heat stimulation is slowly conducted to the user compared to immersion in water, a mist bath can be performed while reducing the user's physical burden.

[0160] Since the water mist generating unit 8 is equipped with a water temperature detection unit for detecting water temperature in the first embodiment of the present invention configured as such, the water temperature can be controlled more reliably by detecting the water temperature. Therefore, the water mist generating unit 8 and the water mist supply unit 10 can more reliably retain the water mist in the heating state within the retention space 4 of the bathtub body 6.

[0161] In the first embodiment of the invention configured as such, by heating the water or water mist to above 60°C, the effects of at least some bacteria (e.g. Legionella) can be suppressed, even if bacteria are assumed to be present in the water.

[0162] Since in the first embodiment of the present invention configured in this way, the retention boundary surface 66 on the upper side of the retained water mist is formed at a height position that is lower than the height of the overflow surface 6b of the bathtub body 6 plus the height equivalent to the depth of the bathtub body 6, the situation where the retention boundary surface 66 is formed at an excessively high position can be suppressed, thereby improving the user's comfort.

[0163] Since in the first embodiment of the present invention configured in this way, the retention boundary surface 66 of the water mist on the upper side is formed at a height position higher than the overflow surface 6b of the bathtub body 6, it is convenient to perform a mist bath on the upper part of the user's body sitting in the bathtub body 6, and the user's body can be heated at a higher level than the usual water level, thereby further improving the user's comfort.

[0164] In the first embodiment of the present invention, the retention boundary surface 66 of the water mist is formed at a height that is lower than the height of the overflow surface 6b of the bathtub body 6 plus a value between 100 mm and 200 mm. Therefore, it is easy to form the retention boundary surface 66 at a height that is lower than the position of the user's face when sitting in the bathtub body 6, thereby further improving the user's comfort.

[0165] Since the water mist supply unit 10 is positioned above the water overflow section in the bathtub body 6 in the first embodiment of the present invention, as configured in this way, the water in the bathtub body 6 as sewage can be prevented from intruding from the water mist supply unit 10 to the upstream side.

[0166] Since the water mist supply unit 10 is positioned above the overflow surface 6b of the water in the bathtub body 6 in the first embodiment of the present invention, as configured in this way, it is possible to prevent water in the bathtub body 6 from intruding from the water mist supply unit 10 to the upstream side as sewage.

[0167] Since the water mist generating device 1 is further equipped with an indoor temperature measuring instrument 24 for detecting the air temperature in the bathroom where the bathtub body 6 is installed, the water mist generating unit 8 can generate water mist in a heated state according to the air temperature in the bathroom where the bathtub body 6 is installed. Therefore, the water mist generating unit 8 and the water mist supply unit 10 can make the water mist in a heated state more reliably stay in the retention space 4 of the bathtub body 6.

[0168] Furthermore, the first embodiment of the present invention is a bathtub device, characterized in that it comprises: a water mist generating device according to the first embodiment of the present invention; and a bathtub body 6, which has a retention space 4 for receiving water mist supplied from the water mist supply section 10 of the water mist generating device 1.

[0169] In the first embodiment of the present invention, with the water mist generating unit 8 and the water mist supply unit 10 of the water mist generating device 1 arranged on the short side of the bathtub body 6, the water mist supplied from the water mist supply unit 10 can be supplied relatively evenly in the left-right direction of the short side within the retention space 4 of the bathtub body 6, thereby suppressing the disturbance of water mist retention. Furthermore, since a mist stream that adjusts the water mist to achieve a relatively uniform state can be supplied in the left-right direction of the short side, and this mist travels along the long side, it can easily provide the user with a therapeutic effect and a sophisticated visual effect.

[0170] Next, refer to Figure 23 and Figure 24The water mist generating apparatus 101 according to the second embodiment of the present invention will be described. The water mist generating apparatus 101 of the second embodiment differs from the first embodiment described above in that the water mist supply section has a downward-facing water mist supply port. Here, only the differences between the second embodiment and the first embodiment of the present invention will be described, and the same reference numerals are used to mark the same parts in the drawings and the description is omitted.

[0171] Figure 23 This is a perspective view of a bathtub device equipped with the water mist generating apparatus according to the second embodiment of the present invention. Figure 24 This is a side view of a bathtub device equipped with the water mist generating device according to the second embodiment of the present invention.

[0172] exist Figure 24 In the second embodiment, the retention boundary surface 66 is formed in the same way as that in the first embodiment. However, due to space limitations, reference symbols M0, M1, M2, M3, and L1 related to the description of the formation position of the retention boundary surface 66 are omitted. In the second embodiment, the descriptions of reference symbols M0, M1, M2, M3, and L1 related to the description of the formation position of the retention boundary surface 66 can also refer to the descriptions related to the retention boundary surface 66 in the first embodiment. Figure 2 The description of etc.

[0173] like Figure 23 and Figure 24 As shown, a bathtub device 2 equipped with the water mist generating device 101 according to the second embodiment of the present invention is installed in a bathroom 3. A water-using facility is a device that provides a water-discharging device for use in a bathroom, the bathing area floor of a bathroom, a toilet, a washroom, a kitchen, etc. The water mist generating device 101 is a water mist generating device used on the bathtub body of the water-using facility, the bathing area floor of the bathroom, the shower room, the washbasin, the sink, and the kitchen sink.

[0174] The water mist generating device 101 is used in a water-using facility, namely a bathtub device 2. The water mist generating device 101 includes a water mist generating unit 108 that generates water mist and a water mist supply unit 110 that supplies water mist into the bathtub body 6.

[0175] The water mist generating unit 108 is installed on the wall W of the bathroom 3, and at a height higher than the bathtub body 6. The water mist generating unit 108 is positioned above the short side portion 6e on the upper edge of the bathtub body 6. The water mist generating unit 108 is separate from the bathtub body 6. That is, the water mist generating unit 108 is not directly installed on the bathtub body 6, thus forming a gap between the bottom surface of the water mist generating unit 108 and the short side portion 6e. However, although the water mist generating unit 108 is separate from the bathtub body 6, as a variation, it can also be configured to contact or be installed on the bathtub body 6. Furthermore, the water mist generating unit 108 in the second embodiment has essentially the same constituent elements and functions as the water mist generating unit 8 in the first embodiment, except for the different placement position. Therefore, for the same parts, the same reference symbols are used in the accompanying drawings and the descriptions are omitted or given only briefly, mainly to describe the different parts.

[0176] The water mist generating unit 108 includes: a water supply line 14 for supplying water from a water source to the water tank 12; a drainage line 16 for draining water from the water tank 12 to a drain pipe; an ultrasonic vibrator 18 disposed on the bottom inner side of the water tank 12; a heater 20 disposed on the bottom inner side of the water tank 12; a water temperature detection unit, i.e., a water temperature measuring instrument 22, disposed on the inner side of the water tank 12; an air temperature detection unit, i.e., an indoor temperature measuring instrument 24, disposed on the outer side of the water tank 12; and a control unit 26 for controlling the ultrasonic vibrator 18 and the heater 20.

[0177] Water tank 12 is installed on the surface side of wall W (the interior side of bathroom 3). A water supply passage 14 and a drainage passage 16 are connected to the lower side wall of water tank 12. A water mist supply unit 110 is connected to the side wall near the center of water tank 12. Water supply passage 14 extends from the surface side of wall W to the rear side (the exterior side of bathroom 3). Drainage passage 16 extends from the surface side of wall W to the rear side. A control unit 26 is located on the rear side of wall W.

[0178] The water mist supply unit 110 supplies water mist generated by the water mist generating unit 108 into the retention space 4, i.e., the bathtub body 6, which is open above the room where the bathtub body 6 is housed. The water mist supply unit 110 is positioned above the short side portion 6e of the short side of the bathtub body 6. Figure 24 As shown in the cross-section of the flow path, the water mist supply unit 110 includes: a water mist supply flow path 111 that extends laterally from the water mist generation unit 108 to the upper part of one end of the retention space 4; and a water mist supply port 113 that is connected to the downstream end of the water mist supply flow path 111 and opens downward.

[0179] The water mist supply path 111 extends approximately horizontally from the middle portion of the water tank 12 in the vertical direction. Alternatively, the water mist supply path 111 may extend from the upper part of the water tank 12. Furthermore, the water mist supply path 111 may extend downwards at an angle from the water mist generation section 108 toward the retention space 4. Additionally, the water mist supply path 111 may be combined with the downward-facing water mist supply port 113 to form a flow path that curves laterally into an arc and then downwards. Viewed from the front (from the retention space 4 side), the water mist supply path 111 forms a rectangular flow path (e.g., a flow path cross-section) with a horizontal width. The bottom surface 111a of the water mist supply path 111 is in the left-right direction relative to the short side portion 6e of the bathtub body 6. Figure 24 The water mist extends parallel and flat in the depth direction of the drawing, and extends parallel and flat in the front-back direction of the short side portion 6e. A longitudinal wall 111b is formed on the front side of the retention space 4 of the water mist supply flow path 111, and the water mist passing through the water mist supply section 110 is guided downward by the longitudinal wall 111b.

[0180] The water mist supply port 113 extends downward from the downstream end of the water mist supply flow path 111. The water mist supply port 113 forms a pipe-like flow path extending downward. The water mist supply port 113 forms an opening that opens downward. When viewed from the front of its opening (viewed from below to above), the water mist supply port 113 forms a rectangular flow path (e.g., a flow path cross-section) with a width of [missing information]. The water mist supply port 113 [missing information] in the left-right direction... Figure 24 The width of the depth direction of the drawing and the left-right direction of the water mist supply flow path 111 ( Figure 24 The width of the water mist supply port 113 in the left-right direction is the same as that of the water mist supply flow path 111 in the left-right direction. The width of the water mist supply port 113 in the left-right direction is shorter than the width of the short side portion 6e in the left-right direction. Alternatively, the width of the water mist supply port 113 in the left-right direction can be approximately the same as the overall width of the short side portion 6e, for example, the width of the stagnation space 4 of the short side portion 6e in the left-right direction. Furthermore, the width of the water mist supply port 113 in the left-right direction can be approximately half the overall width of the stagnation space 4 of the short side portion 6e in the left-right direction.

[0181] The lower end 113a of the water mist supply port 113 is in the left-right direction with the short side portion 6e of the bathtub body 6. Figure 24The lower end 113a extends parallel to the depth direction of the drawing. It is located in the retention space 4, which is further inside the bathtub body 6 than the shorter side portion 6e. The water mist supply port 113 is located above the retention space 4. The water mist supply port 113 extends downward in the vertical direction. Alternatively, the water mist supply port 113 may extend diagonally downward. An imaginary line N along the opening direction of the water mist supply port 113 extends into a space, for example, the retention space 4, which is further inside the shorter side portion 6e of the bathtub body 6.

[0182] The lower end 113a of the water mist supply port 113 is positioned above the water overflow portion 6c within the bathtub body 6. Therefore, it can prevent water within the bathtub body 6 from flowing as wastewater from the water mist supply port 113 to the upstream side. Alternatively, the lower end 113a of the water mist supply port 113 can also be located below the upper end of the retention boundary surface 66. In this embodiment, the overflow portion 6c is the overflow surface 6b of the bathtub body 6, and the lower end 113a of the water mist supply port 113 is positioned above the short side portion 6e of the bathtub body 6. As a variation, the overflow portion 6c can also be an overflow outlet provided within the bathtub body 6. Therefore, the lower end 113a of the water mist supply port 113 can also be located above the overflow outlet provided within the bathtub body 6 and below the short side portion 6e.

[0183] The length of the water mist supply port 113 can vary, for example, from the lower part of the water mist supply flow path 111 to the lower end 113a. The lower end 113a of the water mist supply port 113 is, for example, positioned at a position higher than 0 mm above the overflow portion 6c, or, for example, positioned at a higher position of 50 mm or more above the overflow portion 6c. Furthermore, the lower end 113a can be positioned at a height of less than 400 mm above the short side portion 6e, or, for example, positioned at a height of less than 100 mm above the short side portion 6e. Therefore, the lower end 113a of the water mist supply port 113 is positioned, for example, within a height range that is 0 mm higher than the height of the overflow portion 6c and less than 400 mm above the short side portion 6e. More preferably, the lower end 113a of the water mist supply port 113 is positioned at a height, for example, at a height that is at least 50 mm above the height of the overflow portion 6c and at a height less than 100 mm above the height of the short side portion 6e. By positioning the lower end 113a of the water mist supply port 113 as described above, the travel distance of the water mist from the lower end 113a to the retention space 4 can be shortened, thereby facilitating the supply control of the water mist, such as the temperature, supplied to the retention space 4, and suppressing the diffusion of water mist before it is supplied to the retention space 4. By positioning the lower end 113a of the water mist supply port 113 as described above at a height that is 0 mm above the height of the overflow portion 6c, for example, even when the overflow portion 6c is located at a position lower than the upper side of the bathtub body 6, it is possible to prevent water in the bathtub body 6 from entering the upstream side from the lower end 113a as wastewater before the water in the bathtub body 6 overflows from the overflow portion 6c. Furthermore, by positioning the lower end 113a of the water mist supply port 113 at a height 50 mm higher than the height of the overflow portion 6c, the intrusion of water from the bathtub body 6 into the upstream side as sewage can be further suppressed.

[0184] As a variation, the water mist supply port 113 can also be formed as an opening on the lower side of the water mist supply flow path 111, opening downwards. This lower-side-opening water mist supply port 113 forms an opening as a pipe-like flow path from the water mist supply flow path 111 downwards and does not protrude. When viewed from the front of its opening (viewed from below the lower-side-opening water mist supply port 113 looking upwards), the lower-side-opening water mist supply port 113 forms a rectangular flow path (flow path cross-section) with a horizontal width. The left-right width of the lower-side-opening water mist supply port 113 is the same as the left-right width of the water mist supply flow path 111. The left-right width of the lower-side-opening water mist supply port 113 is shorter than the left-right width of the shorter side portion 6e. Alternatively, the width of the water mist supply port 113 in the lower side opening in the left-right direction can be approximately the same as the overall width of the short side portion 6e, for example, the width of the retention space 4 in the left-right direction on the short side portion 6e. Furthermore, the width of the water mist supply port 113 in the left-right direction in the lower side opening can also be approximately half the overall width of the retention space 4 in the left-right direction. The left-right sides of the water mist supply port 113 in the lower side opening extend parallel to the left-right direction of the short side portion 6e of the bathtub body 6. The water mist supply port 113 in the lower side opening is located above the retention space 4, which is closer to the inside of the bathtub body 6 than the short side portion 6e. Although the water mist supply port 113 in the lower side opening opens downwards in the vertical direction, it can also open downwards towards the retention space 4. The water mist supply port 113 with the lower side opening is positioned above the water overflow port 6c inside the bathtub body 6, and the water mist supply port 113 with the lower side opening is positioned above the short side portion 6e of the bathtub body 6.

[0185] Furthermore, in this embodiment, the water mist supply unit 110 sets the supply rate per volume to, for example, within the range of 0.03 mL / min·L to 1.5 mL / min·L. For example, the water mist supply unit 110 can supply water mist at a rate of 11 mL / min per unit time to the 330L retention space 4 of the bathtub body 6. Additionally, for example, the water mist supply unit 110 can supply water mist at a rate of 6 mL / min per unit time to a 4.32L retention space 4 for measuring temperature difference and particle size, or other water-using equipment. The water mist supply rate can be controlled by the number of ultrasonic vibrators 18, their output, the direction of ultrasonic wave irradiation, the water level in the water mist generation unit 108, or the flow path shape within the water mist generation unit 108 and the water mist supply unit 110.

[0186] The water mist generating unit 108 and the water mist supply unit 110 generate heated water mist while controlling the temperature of the water mist to facilitate its retention within the retention space 4. This will be explained below. The water mist generating unit 108 and the water mist supply unit 110 are configured such that the temperature difference between the water mist supplied from the water mist supply unit 110 to the retention space 4 and the indoor temperature of the water-using area before the water mist supply begins is 0°C or higher, so that the water mist supplied from the water mist supply unit 110 is retained within the retention space 4 of the bathtub body 6. Furthermore, the water mist generating unit 108 and the water mist supply unit 110 of the water mist generating device 101 are configured to generate a temperature difference such that the upward force of the rising airflow caused by the temperature difference does not exceed the weight of the water mist corresponding to the particle size of the water mist supplied from the water mist supply unit 110. Water mist supply can also be achieved by pre-setting the temperature of the water supplied to the water mist generating unit 108, the heating temperature of the heater 20, or the frequency of the ultrasonic vibrator 18 based on the assumed temperature range of the air in the indoor space 5, without using the indoor temperature measuring instrument 24 (not relying on the measurement results of the indoor temperature measuring instrument 24). Furthermore, water mist supply can also be achieved by adjusting the settings during supply. The water mist generating unit 108 and the water mist supply unit 110 are configured such that the temperature difference is preferably below 100°C, more preferably below 60°C, and even more preferably below 45°C. While generating water mist in a heated state, the water mist generating unit 108 and the water mist supply unit 110 can control the particle size of the water mist so that the water mist can easily remain in the retention space 4.

[0187] Since the operation, various measurement methods, and effects of the water mist generating device 101 in the second embodiment are basically the same as those of the water mist generating device 1 in the first embodiment, the description of the first embodiment can be referred to for the parts that are repeated with the operation, various measurement methods, and effects of the first embodiment. Therefore, the description is omitted in the second embodiment.

[0188] In the second embodiment of the present invention, the water mist supply unit 110 has a downward-opening water mist supply port 113. Therefore, compared to the case where the water mist supply port 113 of the water mist supply unit 110 is open laterally or upwards, the travel distance of the water mist supplied from the water mist supply port 113 to the bathtub body 6 can be suppressed to a shorter distance. Furthermore, it can prevent the water mist from experiencing temperature drops or other changes during its journey from the water mist supply port 113 to the bathtub body 6, thus preventing difficulties in adjusting the temperature of the water mist reaching the bathtub body 6. Consequently, the heated water mist can more easily remain in the open retention space 4 above the bathtub body 6. Moreover, for example, since the water mist supply unit 110 has a downward-opening water mist supply port 113, it can prevent water in the bathtub body 6 from flowing as wastewater from the water mist supply unit 110 to the upstream side.

Claims

1. A water mist generating device for a bathtub body, comprising: The water mist generation unit generates water mist from heated water with controlled water temperature, or generates temperature-controlled water mist by heating water mist generated from water. The water mist supply unit supplies the water mist generated by the water mist generating unit into the bathtub body, which has an open-top retention space, the retention space being the space inside the bathtub body. The water mist generating device is characterized in that... The water mist generating unit and the water mist supply unit are configured such that the water mist supplied from the water mist supply unit is retained in the retention space of the bathtub body. The water mist supply unit sets the water mist supply rate per unit volume of the stagnant space to be 0.03 mL / min·L or higher.

2. The water mist generating device according to claim 1, characterized in that, The water mist generating unit includes a water temperature detection unit for detecting water temperature.

3. The water mist generating device according to claim 1 or 2, characterized in that, The water mist generating unit generates water mist from water heated to above 60°C while controlling the temperature of the water, or it heats the water mist generated from water to above 60°C while controlling the temperature of the heated water mist.

4. The water mist generating device according to claim 1 or 2, characterized in that, The retention boundary surface of the water mist on the upper side is formed at a height position that is lower than the height of the overflow surface of the bathtub body plus the height equivalent to the depth of the bathtub body.

5. The water mist generating device according to claim 4, characterized in that, The retention boundary surface of the water mist on the upper side is formed at a height higher than the overflow surface of the bathtub body.

6. The water mist generating device according to claim 4, characterized in that, The retention boundary surface of the water mist on the upper side is formed at a height that is lower than the height of the overflow surface of the bathtub body plus a value between 100mm and 200mm.

7. The water mist generating device according to claim 1 or 2, characterized in that, The water mist supply section is positioned above the water overflow section within the bathtub body.

8. The water mist generating device according to claim 7, characterized in that, The overflow portion of the water inside the bathtub body is the overflow surface of the bathtub body.

9. The water mist generating device according to claim 1 or 2, characterized in that, It also includes a temperature detection unit for detecting the temperature inside the bathroom where the bathtub body is located.

10. The water mist generating device according to claim 1 or 2, characterized in that, The water mist supply unit has a water mist supply port that opens downwards.

11. A bathtub device, characterized in that, have: The water mist generating device according to any one of claims 1 to 10; The bathtub body has a retention space for receiving water mist supplied from the water mist supply unit of the water mist generating device.

12. The bathtub device according to claim 11, characterized in that, The water mist generating part and the water mist supply part of the water mist generating device are disposed on the short side of the bathtub body.

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