Bathtub installation

Abstract

The object of the present invention is to provide a bathtub device that can suppress dizziness in bathers and allow for relatively long bathing times. The bathtub device of the present invention includes: a spray section (8) disposed above the bathtub body; a circulation path (4) connecting the water inlet section and the spray section; a circulation pump (6) disposed in the circulation path; a temperature adjustment section (7) for adjusting the temperature of the hot water supplied to the spray section; a detection section (22) for detecting the temperature of the hot water in the bathtub body; and a control section (16) for controlling the temperature of the hot water supplied to the spray section. The control section performs the following spray temperature adjustment mode: when the temperature of the hot water in the bathtub body is higher than the upper limit of a specified temperature range, the temperature of the hot water sprayed from the spray section toward the bathtub body is reduced to within the specified temperature range; or, the control section performs the following spray temperature adjustment mode: when the temperature of the hot water in the bathtub body is lower than the lower limit of a specified temperature range, the temperature of the hot water sprayed from the spray section toward the bathtub body is increased to within the specified temperature range by the temperature adjustment section.

Description

Technical Field

[0001] This invention relates to bathtub devices, and more particularly to bathtub devices for supplying hot water to a bathtub. Background Technology

[0002] As shown in Patent Document 1, a bathroom system is known to have a body temperature detection unit that determines whether the body temperature of a bather has risen. In this bathroom system, if it is determined that the body temperature of the bather has risen, actions are taken to lower the body temperature of the bather, such as blowing air or introducing cold water, thereby preventing the bather from feeling dizzy or unwell.

[0003] As shown in Patent Document 2, a bathtub device is known that uses a heater to warm the head and back of the bather in order to keep the body temperature of the bather within a comfortable temperature range. The purpose is that, even during prolonged bathing, this bathtub device will keep both the body temperature and the perceived temperature within their respective comfortable temperature ranges.

[0004] Patent Document 1: Japanese Patent Application Publication No. 2005-58299

[0005] Patent Document 2: Japanese Patent Application Publication No. 2018-121851 Summary of the Invention

[0006] As shown in the aforementioned Patent Documents 1 and 2, a method has been developed that allows for longer bathing while preventing dizziness during bathing, thereby raising the deep body temperature of the bather and improving the bathing effect.

[0007] However, in bathtub water circulation systems where bathing involves continuously circulating water from the spray nozzle, if the bather wishes to bathe in relatively hot water, the temperature of the water sprayed from the nozzle will also become the temperature of the water in the bathtub. This can cause a rapid increase in body temperature due to the combined effects of the bathwater and the spray, potentially leading to dizziness or sudden chills from a short bath. Conversely, in bathtub water circulation systems where bathing involves continuously circulating water from the spray nozzle, even prolonged bathing may not result in adequate body warming if the bather wishes to bathe in relatively cooler water.

[0008] Therefore, the present invention addresses the aforementioned problems. Its objective is to provide a bathtub device that, even without adjusting the temperature of the hot water within the bathtub body to a predetermined range, sprays water from the spray nozzle to lower the temperature of the hot water directly contacting the upper body of the bather to a predetermined range, thereby suppressing dizziness and allowing for a longer bathing period. Furthermore, the present invention aims to provide a bathtub device that allows the bather to enjoy a comfortable bathing temperature while being kept warm by a gentle spray of water that does not burden the bather's body.

[0009] To address the aforementioned problem, the present invention provides a bathtub device for supplying hot water to a bathtub. This bathtub device is characterized by comprising: a bathtub body for storing hot water; a water inlet for extracting hot water from the bathtub body; a spray nozzle disposed above the bathtub body for spraying the hot water from the water inlet toward the bathtub body; a circulation path connecting the water inlet and the spray nozzle; a circulation pump disposed in the circulation path for supplying the hot water from the water inlet into the circulation path; a temperature adjustment unit for adjusting the temperature of the hot water supplied to the spray nozzle; a detection unit for detecting the temperature of the hot water in the bathtub body; and a control unit for controlling the temperature of the hot water supplied to the spray nozzle. The control unit controls the water temperature and executes the following spray temperature adjustment mode: when the temperature of the hot water in the bathtub body detected by the detection unit is higher than the upper limit of the specified temperature range, water is drawn from the water inlet, and the temperature adjustment unit lowers the temperature of the hot water sprayed from the spray unit into the bathtub body to the specified temperature range; or, the control unit executes the following spray temperature adjustment mode: when the temperature of the hot water in the bathtub body detected by the detection unit is lower than the lower limit of the specified temperature range, water is drawn from the water inlet, and the temperature adjustment unit raises the temperature of the hot water sprayed from the spray unit into the bathtub body to the specified temperature range.

[0010] In one embodiment of the present invention configured as described above, the control unit executes a water spray temperature adjustment mode in which, if the temperature of the hot water in the bathtub body detected by the detection unit is higher than the upper limit of a predetermined temperature range, the temperature adjustment unit lowers the temperature of the hot water sprayed from the spray nozzle towards the bathtub body to within the predetermined temperature range. Furthermore, the control unit executes a water spray temperature adjustment mode in which, if the temperature of the hot water in the bathtub body detected by the detection unit is lower than the lower limit of a predetermined temperature range, the temperature adjustment unit raises the temperature of the hot water sprayed from the spray nozzle towards the bathtub body to within the predetermined temperature range. Therefore, the temperature of the hot water sprayed from the spray nozzle can be maintained within the predetermined temperature range, preventing the bather from becoming excessively warm and preventing a prolonged state of sluggishness.

[0011] In this invention, preferably, in the water spray temperature adjustment mode, the control unit sprays water from the spray unit toward the bathtub body during a predetermined time period from the start of water spraying from the spray unit, so that the hot water taken from the water inlet is circulated. After the predetermined time, the temperature adjustment unit lowers the temperature of the hot water sprayed from the spray unit to a predetermined temperature range, or after the predetermined time, the temperature adjustment unit raises the temperature of the hot water sprayed from the spray unit to the predetermined temperature range.

[0012] In the present invention configured as described above, in the water spray temperature adjustment mode, water is sprayed from the spray nozzle toward the bathtub body for a predetermined time period from receiving the start control command, so that the hot water taken from the water inlet is circulated. After the predetermined time has elapsed, the temperature adjustment unit lowers the temperature of the hot water sprayed from the spray nozzle to the predetermined temperature range. Therefore, even if the bather wishes to bathe at a temperature higher than the upper limit of the recommended temperature range (i.e., the upper limit of the predetermined temperature range) where the bather can comfortably warm up, water will still be sprayed from the spray nozzle to lower the temperature of the hot water in direct contact with the bather's upper body, such as the neck and shoulders, to the predetermined temperature range without needing to adjust the temperature of the hot water in the bathtub body to the predetermined temperature range. This helps to suppress dizziness in the bather and allows for a longer bathing time.

[0013] Furthermore, in the present invention configured as described above, a water spray temperature adjustment mode is provided in which water is sprayed from the spray nozzle toward the bathtub body for a predetermined time period from receiving the start control command, so that the hot water taken from the water inlet is circulated. After the predetermined time has elapsed, the temperature adjustment unit raises the temperature of the hot water sprayed from the spray nozzle to the predetermined temperature range. Thus, for example, if the bather wishes to bathe at a temperature lower than the lower limit of the predetermined temperature range, the temperature of the hot water in the bathtub body can be set to a relatively low temperature to maintain a comfortable bathing temperature for the bather, and the temperature of the hot water sprayed from the spray nozzle that directly contacts the bather's upper body, such as the neck and shoulders, is raised to the predetermined temperature range, locally warming the bather. Therefore, the bather can bathe at a comfortable temperature while being warmed by water spray that does not burden the bather's body.

[0014] Furthermore, during a predetermined period of time from the start of the control of the water spray temperature adjustment mode, water is sprayed from the spray unit to circulate the hot water taken from the water inlet, which can suppress drastic temperature changes for naked bathers and allow for a bath that is less likely to cause physical strain on the bather.

[0015] In this invention, the temperature adjustment unit preferably has a storage unit for storing hot water at a desired temperature. The control unit is configured such that, when no water is being sprayed from the spray unit, the temperature of the hot water in the bathtub body is obtained by the detection unit. If the obtained temperature is higher than the upper limit temperature of the bathtub, hot water at a temperature lower than the upper limit temperature is stored in the storage unit. If the obtained temperature is lower than the lower limit temperature, hot water at a temperature higher than the lower limit temperature is stored in the storage unit. If the control unit receives an instruction signal to start spraying water from the spray unit, the hot water stored in the storage unit is mixed with the hot water sprayed from the spray unit, thereby executing the spray temperature adjustment mode.

[0016] In the present invention configured as described above, the temperature of the hot water in the bathtub body is obtained when there is no water spraying from the spray nozzle. If the temperature is higher than the upper limit temperature, hot water at a temperature lower than the upper limit temperature is stored in the storage compartment. Therefore, if the control unit receives an instruction signal to start spraying, hot water at a temperature lower than the upper limit temperature in the storage compartment can be immediately mixed into the hot water sprayed from the spray nozzle, thus quickly lowering the temperature of the hot water sprayed from the spray nozzle. Alternatively, the temperature of the hot water in the bathtub body is obtained, and if the temperature is lower than the lower limit temperature, hot water at a temperature higher than the lower limit temperature is stored in the storage compartment. Therefore, if the control unit receives an instruction signal to start spraying, hot water at a temperature higher than the lower limit temperature in the storage compartment can be immediately mixed into the hot water sprayed from the spray nozzle, thus quickly raising the temperature of the hot water sprayed from the spray nozzle.

[0017] In this invention, the temperature adjustment unit preferably has a supply flow path for mixing hot water at the desired temperature into the circulation flow path. The control unit is configured such that, when there is no water spraying from the spray unit, the temperature of the hot water in the bathtub body is obtained by the detection unit. If the obtained temperature is higher than the upper limit temperature, hot water at a temperature lower than the upper limit temperature flows into the supply flow path. If the obtained temperature is lower than the lower limit temperature, hot water at a temperature higher than the lower limit temperature flows into the supply flow path. If the control unit receives an instruction signal to start water spraying from the spray unit, it mixes the hot water in the supply flow path with the hot water sprayed from the spray unit, thereby executing the water spraying temperature adjustment mode.

[0018] In the present invention configured as described above, the temperature of the hot water inside the bathtub body is obtained when there is no water spraying from the spray nozzle. If the temperature of the hot water is higher than the upper limit temperature, hot water at a temperature lower than the upper limit temperature flows into the supply flow path. Therefore, if the control unit receives an instruction signal to start spraying, it can immediately mix hot water at a temperature lower than the upper limit temperature in the supply flow path into the hot water sprayed from the spray nozzle, thereby quickly lowering the temperature of the hot water sprayed from the spray nozzle. Furthermore, if the temperature of the hot water inside the bathtub body is obtained and the temperature of the hot water is lower than the lower limit temperature, hot water at a temperature higher than the lower limit temperature flows into the supply flow path. Therefore, if the control unit receives an instruction signal to start spraying, it can immediately mix hot water at a temperature higher than the upper limit temperature in the supply flow path into the hot water sprayed from the spray nozzle, thereby quickly raising the temperature of the hot water sprayed from the spray nozzle.

[0019] In this invention, preferably, in the water spray temperature adjustment mode, the control unit adjusts the temperature of the hot water sprayed from the water spray unit in multiple stages until the temperature of the hot water in the bathtub body decreases or increases to the temperature within the specified temperature range.

[0020] In one embodiment of the present invention configured as described above, the control unit, in the water spray temperature adjustment mode, adjusts the temperature of the hot water sprayed from the spray nozzle in multiple stages until it decreases or increases from the temperature of the hot water inside the bathtub body to a target temperature within the specified temperature range. This allows the temperature of the hot water sprayed from the spray nozzle to decrease or increase in multiple stages, achieving a decrease or increase in the temperature of the sprayed hot water without causing discomfort to the bather.

[0021] Furthermore, for example, if the temperature adjustment unit has a water supply path connected to the circulation path that supplies hot or cold water from an external supply source, the control unit, in the spray temperature adjustment mode, supplies hot or cold water at a temperature lower than the temperature of the hot water in the bathtub body, or hot water at a temperature higher than the temperature of the hot water in the bathtub body, from the water supply path to the circulation path in a manner that causes the temperature of the hot water sprayed from the spray unit to decrease or increase in multiple stages until it reaches a target temperature within the specified temperature range. This allows the temperature of the hot water sprayed from the spray unit to decrease or increase in multiple stages, achieving a decrease or increase in the temperature of the sprayed water without causing discomfort to the bather.

[0022] In this invention, preferably, in the water spray temperature adjustment mode of the control unit, the temperature of the hot water sprayed from the spray unit is reduced by the temperature adjustment unit in such a way that the rate of decrease of the temperature of the hot water sprayed from the spray unit in the first stage of the plurality of stages is greater than the rate of decrease in the second stage, or the temperature of the hot water sprayed from the spray unit is increased by the temperature adjustment unit in such a way that the rate of increase of the temperature of the hot water sprayed from the spray unit in the first stage of the plurality of stages is greater than the rate of increase in the second stage.

[0023] In one embodiment of the present invention configured as described above, in the water spray temperature adjustment mode of the control unit, the temperature adjustment unit lowers the temperature of the hot water sprayed from the spray unit in such a way that the rate of decrease in the temperature of the hot water sprayed from the spray unit in the first stage of the plurality of stages is greater than the rate of decrease in the second stage. Therefore, in the first stage of the plurality of stages, the temperature of the hot water sprayed from the spray unit can be brought closer to the specified temperature range more quickly, allowing the temperature of the hot water sprayed from the spray unit to approach the recommended temperature zone (i.e., the specified temperature range) where the bather can comfortably warm up earlier, and thereafter the temperature of the hot water sprayed from the spray unit decreases more slowly, so that the bather continuously feels the temperature decrease, thereby suppressing the bather's habituation to the spray temperature and continuously providing a stimulating sensation of coolness and temperature change.

[0024] Furthermore, in one embodiment of the present invention configured as described above, in the water spray temperature adjustment mode of the control unit, the temperature adjustment unit increases the temperature of the hot water sprayed from the spray unit in such a way that the rate of increase of the hot water temperature in the first stage of the plurality of stages is greater than the rate of increase in the second stage. Therefore, in the first stage of the plurality of stages, the temperature of the hot water sprayed from the spray unit can be brought closer to the predetermined temperature range more quickly, allowing the temperature of the hot water sprayed from the spray unit to approach the predetermined temperature range where the bather feels comfortable earlier, and thereafter the temperature of the hot water sprayed from the spray unit increases more steadily, allowing the bather to continuously feel the temperature increase, thereby suppressing the bather's habituation to the spray temperature and continuously providing a stimulating sensation of warmth and temperature change.

[0025] Furthermore, for example, if the temperature adjustment unit has a water supply path connected to the circulation path for supplying hot or cold water from an external supply source, in the spray temperature adjustment mode of the control unit, hot or cold water at a temperature lower than that of the hot water in the bathtub body is supplied from the water supply path to the circulation path in such a way that the rate of decrease in the temperature of the hot water sprayed from the spray unit in the first stage of the plurality of stages is greater than the rate of decrease in the second stage. Thus, in the first stage of the plurality of stages, the temperature of the hot water sprayed from the spray unit can be brought closer to the specified temperature range more quickly, bringing the temperature of the sprayed hot water closer to the recommended temperature range (i.e., the specified temperature range) where the bather can comfortably warm up earlier, and then the temperature of the sprayed hot water decreases more slowly thereafter, allowing the bather to continuously feel the temperature decrease, thereby suppressing the bather's habituation to the spray temperature and providing a continuous sensation of coolness and temperature change.

[0026] Furthermore, for example, if the temperature adjustment unit has a water supply path connected to the circulation path for supplying hot or cold water from an external supply source, in the spray temperature adjustment mode of the control unit, the temperature of the hot water sprayed from the spray unit is increased in such a way that the rate of increase of the temperature of the hot water sprayed from the spray unit in the first stage of the plurality of stages is greater than the rate of increase in the second stage. Thus, in the first stage of the plurality of stages, the temperature of the hot water sprayed from the spray unit can be brought closer to the specified temperature range more quickly, allowing the temperature of the hot water sprayed from the spray unit to approach the recommended temperature range (i.e., the specified temperature range) where the bather can comfortably warm up earlier, and thereafter the temperature of the hot water sprayed from the spray unit increases more steadily, allowing the bather to continuously feel the temperature increase, thereby suppressing the bather's habituation to the spray temperature and providing a continuous sense of warmth and temperature change stimulation.

[0027] In this invention, preferably, in the water spray temperature adjustment mode of the control unit, the temperature of the hot water sprayed from the spray unit is reduced by the temperature adjustment unit in such a way that the decrease time of the temperature of the hot water sprayed from the spray unit in the first stage of the plurality of stages is shorter than the decrease time in the second stage, or the temperature of the hot water sprayed from the spray unit is increased by the temperature adjustment unit in such a way that the increase time of the temperature of the hot water sprayed from the spray unit in the first stage of the plurality of stages is shorter than the increase time in the second stage.

[0028] In one embodiment of the present invention configured as described above, in the water spray temperature adjustment mode of the control unit, the temperature adjustment unit lowers the temperature of the hot water sprayed from the spray unit in such a way that the decrease time of the temperature reduction in the first stage of the plurality of stages is shorter than the decrease time in the second stage. Therefore, in the first stage of the plurality of stages, the temperature of the hot water sprayed from the spray unit can approach the predetermined temperature range in a relatively short time, bringing the temperature of the sprayed hot water closer to the recommended temperature range (i.e., the predetermined temperature range) where the bather can comfortably warm up earlier, and then the temperature of the sprayed hot water decreases over a relatively long period thereafter, allowing the bather to continuously feel the temperature decrease. This suppresses the bather's habituation to the spray temperature and provides a continuous sensation of coolness and temperature change stimulation. Furthermore, by making the time for temperature change relatively short for a naked bather in the initial first stage and making the time for temperature change longer in the subsequent second stage, the temperature of the sprayed hot water can be reduced while minimizing the burden on the bather's body.

[0029] Furthermore, in one embodiment of the present invention configured as described above, in the water spray temperature adjustment mode of the control unit, the temperature adjustment unit increases the temperature of the hot water sprayed from the spray unit in such a way that the rise time of the hot water temperature in the first stage of the plurality of stages is shorter than the rise time in the second stage. Therefore, in the first stage of the plurality of stages, the temperature of the hot water sprayed from the spray unit can approach the predetermined temperature range in a relatively short time, allowing the temperature of the hot water sprayed from the spray unit to approach the predetermined temperature range that makes the bather feel comfortable earlier, and then the temperature of the hot water sprayed from the spray unit decreases more steadily thereafter, allowing the bather to continuously feel the temperature rise. This suppresses the bather's accustomingness to the increased spray temperature and provides a continuous sense of warmth and temperature change stimulation. In addition, the time for temperature change to occur to a naked bather is relatively short in the initial first stage, and the time for temperature change to occur to occur to the bather is longer in the subsequent second stage, thereby achieving the increase in the temperature of the hot water sprayed from the spray unit less of a burden on the bather's body.

[0030] Furthermore, for example, when the temperature adjustment unit has a water supply path connected to the circulation path for supplying hot or cold water from an external supply source, in the spray temperature adjustment mode of the control unit, the temperature adjustment unit reduces the temperature of the hot water sprayed from the spray unit in a manner that shortens the temperature drop time of the hot water sprayed from the spray unit in the first stage of the plurality of stages compared to the temperature drop time in the second stage. Thus, in the first stage of the plurality of stages, the temperature of the hot water sprayed from the spray unit can approach the specified temperature range in a relatively short time, bringing the temperature of the sprayed hot water closer to the recommended temperature range (i.e., the specified temperature range) where the bather can comfortably warm up earlier, and then the temperature of the sprayed hot water can decrease over a relatively long period, allowing the bather to continuously feel the temperature drop. This suppresses the bather's habituation to the spray temperature and provides a continuous sensation of coolness and temperature change. In addition, the initial first stage involves a shorter time for the temperature change to be applied to the naked bather, while the subsequent second stage involves a longer time for the temperature change to be applied to the bather. This allows for a reduction in the temperature of the hot water sprayed out while being less stressful on the bather's body.

[0031] Furthermore, for example, if the temperature adjustment unit has a water supply path connected to the circulation path for supplying hot or cold water from an external supply source, in the spray temperature adjustment mode of the control unit, the temperature of the hot water sprayed from the spray unit is increased in such a way that the rise time of the hot water temperature in the first stage of the plurality of stages is shorter than the rise time in the second stage. Thus, in the first stage of the plurality of stages, the temperature of the hot water sprayed from the spray unit can approach the specified temperature range in a relatively short time, allowing the temperature of the hot water sprayed from the spray unit to approach the recommended temperature range (i.e., the specified temperature range) where the bather can comfortably warm up earlier, and then the temperature of the hot water sprayed from the spray unit decreases relatively steadily thereafter, allowing the bather to continuously feel a temperature rise. This suppresses the bather's accustomingness to the increased spray temperature and provides a continuous sense of warmth and stimulation from temperature changes. In addition, the initial first stage involves a shorter time for bringing temperature changes to the naked bather, while the subsequent second stage involves a longer time for bringing temperature changes to the bather. This allows for a rise in the temperature of the hot water sprayed out without putting too much strain on the bather's body.

[0032] In this invention, it is preferable that the water spray temperature adjustment mode of the control unit has the following temperature change suppression control: between the first stage and the second stage among the plurality of stages, the temperature decrease is less compared to either the first stage or the second stage; or, the water spray temperature adjustment mode of the control unit has the following temperature change suppression control: between the first stage and the second stage among the plurality of stages, the temperature rise is less compared to either the first stage or the second stage.

[0033] In one embodiment of the present invention configured as described above, the water spray temperature adjustment mode of the control unit has a temperature change suppression control such that, between the first stage and the second stage among the plurality of stages, the temperature decrease is less compared to either the first stage or the second stage. Therefore, in the first stage, it is possible to allow the bather to temporarily adjust to the lowered water spray temperature after the temperature of the hot water sprayed from the spray unit has decreased, thus reducing the burden on the bather's body. Furthermore, the second stage lowers the temperature of the hot water sprayed from the bather's body after the bather has adjusted to the further reduced water spray temperature in the first stage, thus further reducing the burden on the bather's body.

[0034] Furthermore, in one embodiment of the present invention configured as described above, the water spray temperature adjustment mode of the control unit has the following temperature change suppression control: between the first stage and the second stage among the plurality of stages, the temperature rise is less compared to either the first stage or the second stage. Therefore, in the first stage, it is possible to allow the bather to acclimate to the temporarily increased water spray temperature after the temperature of the hot water sprayed from the spray unit has risen, thus reducing the burden on the bather's body. Furthermore, the second stage's increase in the temperature of the hot water sprayed is performed after the bather's body has acclimatized to the further increased water spray temperature in the first stage, thus further reducing the burden on the bather's body.

[0035] In this invention, preferably, in the water spray temperature adjustment mode of the control unit, the execution time of the temperature change suppression control is longer than the fall time in the first stage, or the execution time of the temperature change suppression control is longer than the rise time in the first stage.

[0036] In one embodiment of the present invention configured as described above, in the water spray temperature adjustment mode of the control unit, the execution time of the temperature change suppression control is longer than the decrease time in the first stage. Therefore, the execution time of the temperature change suppression control after the bather has temporarily lowered the water spray temperature can be set longer, making it less likely to burden the bather's body.

[0037] Furthermore, in one embodiment of the present invention configured as described above, in the water spray temperature adjustment mode of the control unit, the execution time of the temperature change suppression control is longer than the rise time in the first stage. Therefore, the execution time of the temperature change suppression control, where temperature changes are relatively small, can be set longer, making it less likely to burden the bather's body.

[0038] In this invention, preferably, in the water spray temperature adjustment mode of the control unit, the execution time of the temperature change suppression control is shorter than the fall time in the second stage, or the execution time of the temperature change suppression control is shorter than the rise time in the second stage.

[0039] In one embodiment of the present invention configured as described above, in the water spray temperature adjustment mode of the control unit, the execution time of the temperature change suppression control is shorter than the decrease time in the second stage. This ensures that the execution time of the temperature change suppression control is sufficient to allow the bather to adjust to the temporarily lowered water spray temperature, and also makes the decrease time longer in the second stage, thereby achieving a reduction in the temperature of the hot water sprayed out while minimizing strain on the bather's body.

[0040] Furthermore, in one embodiment of the present invention configured as described above, in the water spray temperature adjustment mode of the control unit, the execution time of the temperature change suppression control is shorter than the rise time in the second stage. This ensures that the execution time of the temperature change suppression control is short enough to allow the bather to easily adapt to the temporarily increased water spray temperature, and also makes the rise time longer in the second stage, thereby achieving an increase in the temperature of the hot water sprayed out while being less burdensome to the bather's body.

[0041] In this invention, the temperature adjustment unit preferably has a water supply path, which is connected to the circulation path to supply hot or cold water from an external supply source.

[0042] In one embodiment of the present invention configured as described above, the control unit has a water spray temperature adjustment mode in which, when the temperature of the hot water in the bathtub body detected by the detection unit is higher than the upper limit of a predetermined temperature range, water is sprayed from the spray unit toward the bathtub body for a predetermined time period from receiving the start control command, so that the hot water taken from the water inlet circulates. After the predetermined time has elapsed, hot water or cold water at a temperature lower than the temperature of the hot water in the bathtub body detected by the detection unit is supplied from the water supply path to the circulation path, so that the temperature of the hot water sprayed from the spray unit is reduced to the predetermined temperature range. Therefore, even if the bather wishes to bathe at a temperature higher than the temperature of the hot water in the bathtub body, for example, the upper limit of the predetermined temperature range preferred by most bathers, the temperature of the hot water in the bathtub body will not be adjusted to the predetermined temperature range, but the temperature of the hot water sprayed from the spray unit that is in direct contact with the upper body of the bather, such as the neck and shoulders, will be reduced to the predetermined temperature range, thus suppressing dizziness and allowing for a longer bathing time. Furthermore, during a predetermined period of time from the start of the control of the water spray temperature adjustment mode, water is sprayed from the spray unit to circulate the hot water taken from the water inlet, which can suppress drastic temperature changes for naked bathers and allow for a bath that is less likely to cause physical strain on the bather.

[0043] The effects of the invention

[0044] The bathtub device according to the present invention can suppress dizziness in bathers and allow for longer bathing periods. Furthermore, the bathtub device according to the present invention allows bathers to bathe at a comfortable temperature while being warmed by gentle sprays of water that do not burden the body. Attached Figure Description

[0045] Figure 1This is a perspective view of the entire bathroom equipped with the bathtub device according to the first embodiment of the present invention.

[0046] Figure 2 It is along Figure 1 A cross-sectional view observed along line II-II.

[0047] Figure 3 This is a side view showing the state of the water spray device, circulation path, and chamber of the bathtub device according to the first embodiment of the present invention, viewed from the short side of the bathtub body.

[0048] Figure 4 It is along Figure 3 A cross-sectional view observed along line IV-IV.

[0049] Figure 5 This is a perspective view showing the circulation path, water supply path, storage section, etc., arranged on the rear side of the bathtub body of the bathtub device according to the first embodiment of the present invention.

[0050] Figure 6 This is a diagram illustrating the hot water supply system in the bathtub apparatus according to the first embodiment of the present invention.

[0051] Figure 7 This is a flowchart illustrating the operation of the bathtub device according to the first embodiment of the present invention.

[0052] Figure 8 yes Figure 7 The flowchart of the subroutine for the first water spray temperature adjustment mode in the water spray temperature adjustment mode.

[0053] Figure 9 yes Figure 7 The flowchart of the subroutine for the second water spray temperature adjustment mode in the water spray temperature adjustment mode.

[0054] Figure 10 It means Figure 7 A time sequence diagram showing the relationship between the temperature and time of the hot water sprayed from the spray device in the first spray temperature adjustment mode.

[0055] Figure 11 It means Figure 7 A time sequence diagram showing the relationship between the temperature and time of the hot water sprayed from the spray device in the second spray temperature adjustment mode.

[0056] Figure 12 This is a diagram illustrating the hot water supply system in the bathtub apparatus according to the second embodiment of the present invention.

[0057] Figure 13This is a flowchart illustrating the function of the bathtub device according to the second embodiment of the present invention.

[0058] Figure 14 In the second embodiment of the present invention, from Figure 13 The flowchart shown calls a subroutine that represents the processing in the first water spray temperature adjustment mode.

[0059] Figure 15 In the second embodiment of the present invention, from Figure 13 The flowchart shown calls a subroutine that represents the processing in the second water spray temperature adjustment mode.

[0060] Figure 16 This is a timing diagram showing the temperature change of hot water sprayed from the spray section in the bathtub device according to the second embodiment of the present invention when the first spray temperature adjustment mode is executed.

[0061] Figure 17 This is a timing diagram showing the temperature change of hot water sprayed from the spray section in the bathtub device according to the second embodiment of the present invention when the second spray temperature adjustment mode is executed. Detailed Implementation

[0062] Next, with reference to the accompanying drawings, a bathtub device according to the first embodiment of the present invention will be described. The embodiments of the present invention are described as examples, but those skilled in the art will be able to make numerous modifications, alterations, and substitutions within the spirit and scope of the present invention. Therefore, the present invention is not limited to the disclosed embodiments, and various modifications and alterations can be made regarding its manner and details without departing from the scope of the claims.

[0063] Figure 1 This is a perspective view of the entire bathroom equipped with the bathtub device according to the first embodiment of the present invention. Figure 2 It is along Figure 1 A cross-sectional view observed along line II-II. Figure 3 This is a side view showing the state of the water spray device, circulation path, and chamber of the bathtub device according to the first embodiment of the present invention, viewed from the short side of the bathtub body. Figure 4 It is along Figure 3 A cross-sectional view observed along line IV-IV. Figure 5 This is a perspective view showing the circulation path, water supply path, storage section, etc., arranged on the rear side of the bathtub body of the bathtub device according to the first embodiment of the present invention. Figure 6 This is a diagram illustrating the hot water supply system in the bathtub apparatus according to the first embodiment of the present invention.

[0064] like Figure 1As shown, the bathtub device 1 of the first embodiment of the present invention is a bathtub device installed in a bathroom R that supplies hot water to the bathtub. The bathtub device 1 of the first embodiment of the present invention includes: a bathtub body 2; a water inlet (bathtub water inlet) 9b, which takes out hot water from the bathtub body 2; a spray device 8, which is installed above the bathtub body 2 and sprays water from the hot water taken out from the water inlet 9b toward the bathtub body 2; a circulation path 4, which connects the water inlet 9b and the spray device 8; a first pump (circulation pump) 6, which is installed in the circulation path 4 and pumps the hot water taken out from the water inlet 9b in the circulation path 4; a temperature adjustment unit 7, which adjusts the temperature of the hot water supplied to the spray device 8; and a water supply path (supply pipe) 10. It is connected to the circulation path 4 and supplies hot or cold water from an external supply source to regulate the temperature of the hot water in the circulation path 4; the storage unit 12 is provided in the water supply path (supply pipe) 10 and stores the hot or cold water to be supplied; the second pump (booster pump) 14 is provided in the water supply path 10 downstream of the storage unit 12 and pumps the hot or cold water in the storage unit 12 toward the circulation path 4; the first temperature sensor (spray temperature sensor) 22 is provided in the circulation path 4 and measures the temperature of the hot water in the circulation path 4; and the control unit 16 controls the first pump 6 and the second pump 14.

[0065] The bathtub unit 1 functions as a circulation device that draws hot water from the bathtub body 2 through the water inlet 9b and circulates the hot water from the spray nozzle 8 into the bathtub body 2. A remote control 18 is installed on the wall of the bathroom R, allowing operation of the bathtub unit 1. The remote control 18 is configured to receive input from the bather for temperature adjustment. The remote control 18 is electrically connected to the control unit 16, transmitting the input signal to the control unit 16. The remote control 18 can be located inside the bathroom R, but it can also be located outside the bathroom R. Furthermore, the remote control 18 can arbitrarily set the temperature of the hot water inside the bathtub body 2, the temperature of the hot water sprayed from the spray nozzle 8, the upper limit temperature T2 of a specified temperature range T, and the lower limit temperature T1. Additionally, the times when the spray temperature adjustment mode stops, such as t1 to t4, can also be arbitrarily set. The control unit 16 can perform prescribed control based on the set temperature.

[0066] The bathtub body 2, when viewed from above, is roughly rectangular and box-shaped, designed to store hot water internally. In this embodiment, the bathtub body 2 is configured such that one long side and the two short sides on either side of that long side are entirely in contact with the inner wall of the bathroom R. Furthermore, the inner wall surface forming one short side of the bathtub body 2 is configured as a first inner wall surface, namely the backrest 2a, which is provided for the bather to lean against. A water inlet 9b is formed on the side wall surface 2b of the long side of the bathtub body 2.

[0067] A water spray device 8 is provided on the upper edge of the bathtub body 2. The water spray device 8 is configured to be located on the upper part of the backrest 2a of the bathtub body 2, spraying hot water towards the inside of the bathtub body 2. In this embodiment, the water spray device 8 is configured to have a flat and wide nozzle 8a extending along the upper edge of the backrest 2a, capable of spraying hot water towards the head, shoulders, and back of the bather leaning against the backrest 2a, thus providing shoulder-area hot water spray. Furthermore, the water spray device 8 is configured to spray a portion of the hot water introduced from the water inlet 9b out from the nozzle 8a. Therefore, the hot water in the bathtub body 2 circulates in a manner that draws in from the water inlet 9b, sprays out from the nozzle 8a, and flows into the bathtub body 2. Additionally, a portion of the hot water introduced from the water inlet 9b is also sprayed out from the bathtub nozzle 9a provided on the backrest 2a of the bathtub body 2.

[0068] Furthermore, in this embodiment, the nozzle 8a of the water spray device 8 is flat and wide, so the hot water sprayed from the nozzle 8a forms a wide, ribbon-like water film that lands on the surface of the hot water stored in the bathtub body 2 at a position separate from the back surface 2a. Also, in this embodiment, the water spray device 8 is configured to switch the pressure intensity generated by the first pump 6 to three levels: "strong," "medium," and "weak."

[0069] The circulation path 4 extends from the water inlet 9b to the spray nozzle 8a of the spray device 8. The bathtub device 1 is configured to draw in hot water from the water inlet 9b provided on the inner wall of the bathtub body 2, and then spray the hot water into the bathtub body 2 from the spray nozzle 8a of the spray device 8 via the circulation path 4. The circulation path 4 branches downstream of the first pump 6 into a flow path on the side of the bathtub spray nozzle 9a provided on the back 2a of the bathtub body 2 and a flow path extending towards the chamber 11. Thus, a portion of the hot water drawn in from the water inlet 9b is sprayed out as a jet of hot water from the bathtub spray nozzle 9a provided on the back 2a of the bathtub body 2 via the circulation path 4.

[0070] The circulation path 4 includes: a chamber 11 located in the middle of the circulation path for introducing hot water into the bathtub body 2; a jet-side flow path (first pipe) 4a, which is equipped with a first pump 6; an inlet flow path (second pipe) 4b connected to the chamber 11 for introducing hot water from the bathtub body 2 into the chamber 11; and a spray device-side flow path (third pipe) 4c extending from the chamber 11 to the spray device 8 side.

[0071] A nozzle 20 is provided at the outlet of the chamber 11 in the side flow path 4a of the spray section. The nozzle 20 is located downstream of the first pump 6 and is formed to spray hot water supplied from the first pump 6 through the chamber 11. The hot water sprayed from the nozzle 20 is introduced into the chamber 11 by the action of the spray pump. The flow rate of the hot water introduced into the chamber 11 is added to the flow rate of the hot water sprayed from the nozzle 20, so that a larger flow rate of hot water is supplied to the side flow path 4c of the spray device. The side flow path 4c of the spray device extends along the extension line of the nozzle 20.

[0072] The first pump 6 pressurizes the hot water in the jet section side flow path 4a toward the jet nozzle 20, so that the hot water supplied from the first pump 6 is ejected through the chamber 11. The first pump 6 is configured such that the rotational speed of the internal rotating body is variable. Therefore, by changing the rotational speed of the internal rotating body, the first pump 6 can change the set flow rate of the hot water delivered downstream.

[0073] The chamber 11 is located below the specified water level W1 (e.g., the specified water level required when using the spray device 8) in the bathtub body 2, thus filling the chamber 11 with hot water from the bathtub body 2. The chamber 11 has a storage chamber for storing hot water. Therefore, when hot water sprayed from the nozzle 20 passes through the chamber 11, the hot water in the chamber 11 is drawn in by the sprayed hot water, creating a larger flow rate. A spray-side flow path 4a and a spray device-side flow path 4c are connected to the chamber 11, with the spray device-side flow path 4c connected to the upper surface of the chamber 11 opposite to the spray-side flow path 4a. The diameter of the spray device-side flow path 4c is larger than the diameter of the nozzle 20. An inlet flow path 4b and a water supply flow path 10 are also connected to the chamber 11. Therefore, when hot water is introduced into the chamber 11 by the hot water jetted from the nozzle 20, the hot water in the inlet flow path 4b, the hot water in the water supply flow path 10, or the cold water is introduced into the spray device side flow path 4c through the chamber 11. The chamber 11, nozzle 20, and spray device side flow path 4c, as described above, constitute a jet pump unit. Even when attempting to supply a relatively large flow of hot water to the spray device 8, a relatively large flow of hot water can be supplied with a relatively simple structure and relatively small components. Therefore, a bathtub device 1 capable of supplying a relatively large flow of hot water can be formed in the confined small space between the bathtub body 2 and its shell (skin ring) 2c in the bathroom R.

[0074] In addition, chamber 11 mixes hot water drawn in from water inlet 9b and pressurized by the first pump 6 with hot or cold water supplied from water supply flow path 10, and supplies it to the downstream spray device side flow path 4c. When hot water flows in circulation flow path 4, chamber 11 is in a state of being approximately filled with hot water.

[0075] The first temperature sensor 22 is installed in the flow path 4c on the side of the water spray device to measure the temperature of the hot water sprayed from the water spray device 8. The first temperature sensor 22 also functions as a detection unit to detect the temperature of the hot water inside the bathtub body 2. The first temperature sensor 22 is, for example, a thermistor.

[0076] The temperature adjustment unit 7 has a water supply path 10, which is connected to the circulation path 4. Hot or cold water is supplied from an external source to adjust the temperature of the hot water in the circulation path 4. The water supply path 10 functions as a temperature adjustment unit that adjusts the temperature of the hot water supplied to the spray nozzle. The water supply path 10 forms a supply path for hot water to the circulation path 4. The water supply path 10 is located in the chamber 11 and is connected to a negative pressure generating unit 11a, which generates negative pressure through the flow of hot water flowing within the circulation path 4. In the chamber 11, the top portion of the front of the nozzle 20 (the inlet portion of the spray device side flow path 4c) is the portion where positive pressure is generated by the flow of hot water. On the other hand, in the chamber 11, the top portion, sidewall portion, and bottom portion of the nozzle, excluding the top portion, constitute the negative pressure generating unit 11a. The downstream end 10a of the water supply path 10 connected to the chamber 11 is located in the portion of the nozzle 20 excluding the top portion. The temperature adjustment unit 7 can also be replaced by other devices that function as temperature adjustment units, such as heaters that raise the temperature of hot water in the circulation path 4, or coolers that lower the temperature of hot water, instead of water supply path 10.

[0077] A high-temperature hot water supply pipe (hot water supply pipe) 40a that supplies hot water at a temperature higher than that stored in the bathtub body 2 and a low-temperature hot water supply pipe (water supply pipe) 40b that supplies hot water at a temperature lower than that stored in the bathtub body 2 are connected to the upstream side of the water supply path 10.

[0078] Furthermore, the high-temperature hot water supply pipe 40a and the low-temperature hot water supply pipe 40b are connected to the storage unit 12 via a high-temperature side solenoid valve (hot water solenoid valve) 56 and a low-temperature side solenoid valve (water solenoid valve) 58, respectively. The start and stop of the supply of hot or cold water are controlled by the high-temperature side solenoid valve 56 and the low-temperature side solenoid valve 58. In addition, the amount of hot or cold water flowing into the storage unit 12 from each supply pipe is controlled by a water flow ratio valve 26. Moreover, in this embodiment, hot water with a temperature higher than that of the hot water stored in the bathtub body 2, such as hot water at the hot water temperature set in the water heater 52, is supplied from the water heater 52 to the high-temperature hot water supply pipe 40a. That is, the tap water supplied from the water supply pipe 54, which is an external supply source, branches in the branch section 54a, one branch is supplied to the water heater 52, and the other branch flows directly into the low-temperature hot water supply pipe 40b. The tap water supplied to the water heater 52 is heated to a temperature higher than that of the hot water stored in the bathtub body 2 and supplied to the high-temperature hot water supply pipe 40a. A check valve 45 is provided on the high-temperature hot water supply pipe 40a to prevent backflow of hot or cold water, and a check valve 47 is provided on the low-temperature hot water supply pipe 40b to prevent backflow of water.

[0079] Therefore, when attempting to raise the temperature of the hot water in circulation path 4 and storage section 12, the high-temperature side solenoid valve 56 is opened, supplying hot water from the external water heater 52 to the storage section 12. On the other hand, when attempting to lower the temperature of the hot water in circulation path 4 and storage section 12, the low-temperature side solenoid valve 58 is opened, supplying tap water from the low-temperature hot water supply pipe 40b to the storage section 12. Alternatively, both the high-temperature side solenoid valve 56 and the low-temperature side solenoid valve 58 can be opened simultaneously, mixing hot and cold water while supplying it to the storage section 12 to adjust the temperature.

[0080] Furthermore, the temperature of the hot water stored in the bathtub body 2 is measured by the first temperature sensor 22, but it can also be detected by a bathtub temperature sensor installed on the bathtub body 2. In addition, the temperature of each hot water and water is not detected, but it can also be estimated based on the data obtained from each sensor.

[0081] The temperatures detected by these temperature sensors are sent to the control unit 16, which adjusts the rotation speed of the second pump 14 based on these detected temperatures, so that hot water at the required temperature is sprayed out from the spray device 8.

[0082] The second pump 14 pumps hot or cold water stored in the storage section 12 within the water supply path 10 toward the chamber 11. The second pump 14 is configured such that the rotational speed of its internal rotating body is variable. Thus, by changing the rotational speed of its internal rotating body, the second pump 14 can change the set flow rate of hot water delivered downstream.

[0083] The bathtub device 1 also includes: a water flow sensor 24 that measures the flow rate of hot or cold water between the storage section 12 of the water supply path 10 and the high-temperature side solenoid valve 56 and the low-temperature side solenoid valve 58; a water flow proportional valve (flow regulating valve) 26 that controls the flow rate of hot or cold water; a constant flow valve 28 that limits the maximum flow rate of water passing through the water passage regardless of water pressure; a second temperature sensor (inflow-side temperature sensor) 30 that measures the temperature of hot water in the water supply path 10 leading to the storage section 12; a third temperature sensor (storage tank temperature sensor) 32 that is disposed within the storage section 12; a fourth temperature sensor (outflow-side temperature sensor) 34 that measures the temperature of hot or cold water flowing downstream from the storage section 12; a water flow sensor 36 that is disposed downstream of the second pump 14; a check valve 38 that prevents backflow of hot or cold water; and a solenoid valve 40 that electromagnetically opens and closes the flow path.

[0084] A water flow sensor 24, a water flow proportional valve 26, a constant flow valve 28, and a second temperature sensor 30 are disposed between the storage section 12 of the water supply path 10 and the confluence section 43 downstream of the high-temperature side solenoid valve 56 and the low-temperature side solenoid valve 58. The confluence section 43 is connected to the high-temperature hot water supply pipe 40a and the low-temperature hot water supply pipe 40b, and the water flows of the two are combined.

[0085] The second temperature sensor 30 is located upstream of the storage section 12 in the water supply flow path 10, and measures the temperature of the hot or cold water supplied to the storage section 12 from the high-temperature hot water supply pipe 40a and the low-temperature hot water supply pipe 40b. The second temperature sensor 30 is, for example, a thermistor. The third temperature sensor 32 measures the temperature of the hot or cold water stored in the storage section 12. The third temperature sensor 32 is, for example, a thermistor.

[0086] A fourth temperature sensor 34, a water flow sensor 36, a check valve 38, and a solenoid valve 40 are disposed between the storage section 12 and the chamber 11 of the water supply path 10. The fourth temperature sensor 34 measures the temperature of the hot or cold water flowing from the storage section 12 to the downstream side. The fourth temperature sensor 34 is, for example, a thermistor. The water flow sensor 36 measures the flow rate of the hot or cold water passing through the water supply path 10.

[0087] The control unit 16 controls the supply of hot or cold water from the water supply path 10 to the circulation path 4. The control unit 16 is electrically connected to the first pump 6, the second pump 14, the remote controller 18, the first temperature sensor 22, the water flow sensor 24, the water flow proportional valve 26, the second temperature sensor 30, the third temperature sensor 32, the fourth temperature sensor 34, the water flow sensor 36, the solenoid valve 40, the high-temperature side solenoid valve 56, and the low-temperature side solenoid valve 58. Their electrical connections can be made wirelessly, either as a whole or in part, via infrared communication or other methods. The control unit 16 has a built-in CPU or other arithmetic unit and a memory, enabling it to control the electrically connected devices based on stored, predetermined control programs. For example, the control unit 16 stores in its storage device programs for temperature adjustment preparation control, temperature adjustment control, and control for supplying hot water to other bathtubs, as described later.

[0088] The control unit 16 has a dizziness suppression mode as a water spray temperature adjustment mode. That is, when the temperature of the hot water in the bathtub body 2 detected by the first temperature sensor 22 is higher than the upper limit of the specified temperature range, water is sprayed from the water spray device 8 toward the bathtub body 2 for a specified period of time from receiving the start control command, so that the hot water taken from the water inlet 9b is circulated. After a specified period of time, hot water or cold water with a temperature lower than the temperature of the hot water in the bathtub body 2 detected by the first temperature sensor 22 is supplied from the water supply path 10 to the circulation path 4, so that the temperature of the hot water sprayed from the water spray device 8 is reduced to the specified temperature range.

[0089] Next, the storage section 12 will be explained in detail.

[0090] The storage section 12 is configured to isolate the flow path between the upstream and downstream sides of the water supply flow path 10. The storage section 12 stores hot or cold water up to a predetermined water level specified by the float switch 42. Thus, an upper space 12a is formed in the upper part of the storage section 12, and the storage section 12 is configured to connect to the downstream end 10b of the water supply flow path inlet, which is formed in the upper space 12a. On the other hand, a water supply flow path outlet 10c is connected to the bottom surface of the storage section 12.

[0091] A float switch 42 and an overflow pipe 44 are provided inside the storage section 12. The float switch 42 has a core column 42a, which forms a rod-shaped shaft portion of the float switch 42; and a float portion (float) 42b, which moves up and down along the core column 42a in response to changes in the water level in the storage section 12, while being subjected to buoyancy corresponding to the water level. Thus, when the float switch 42 rises along the core column 42a to the water level detection position in accordance with the water level, it can detect that the hot or cold water in the storage section 12 has reached the upper predetermined water level. When the float switch 42 detects that the hot or cold water has reached the upper predetermined water level, the water level in the storage section 12 is at least the upper predetermined water level, and the control unit 16 can determine that a predetermined amount of hot or cold water is stored in the storage section 12. The float switch 42 is electrically connected to the control unit 16.

[0092] The overflow pipe 44 is formed to extend vertically within the storage section 12. The overflow pipe 44 opens at the top within the storage section 12 and extends from the storage section 12 into a drainage path outside the storage section 12. Thus, the overflow pipe 44 is provided to prevent hot or cold water from overflowing from the storage section 12. When the water level in the storage section 12 exceeds the height of the upper opening 44a of the overflow pipe 44, hot or cold water flows into the overflow pipe 44 and drains into the drainage path.

[0093] Hot water supplied from the high-temperature hot water supply pipe 40a and cold water supplied from the low-temperature hot water supply pipe 40b are introduced into the storage section 12 and temporarily stored in a mixed state within the storage section 12. The storage section 12 is sized to store a specified amount of water. The specified amount of water stored in the storage section 12, which is lower than the water storage capacity of the upper opening 44a of the overflow pipe 44, is greater than the volume of the chamber 11. For example, the storage section 12 has a specified water storage capacity ranging from approximately 0.5L to approximately 3.0L. In addition, the storage section 12 is located above the chamber 11.

[0094] When attempting to store hot or cold water in the storage section 12, the control unit 16 controls the water flow proportional valve 26 in such a way that the flow rate of hot or cold water flowing downstream from the storage section 12 (flow rate per unit time) is less than the flow rate of hot or cold water flowing into the storage section 12 from the upstream side (flow rate per unit time). If the water volume in the storage section 12 further increases compared to the predetermined water level W0, the overflow pipe 44 is used to maintain a constant water level at the top of the storage section 12.

[0095] When attempting to supply hot or cold water from the storage unit 12 to the chamber 11 without depleting the storage unit 12, the control unit 16 controls the water flow proportional valve 26 in such a way that the flow rate of hot or cold water flowing downstream from the storage unit 12 is less than the flow rate of hot or cold water flowing into the storage unit 12 from the upstream side, or in such a way that the flow rate of hot or cold water flowing downstream from the storage unit 12 is approximately the same as the flow rate of hot or cold water flowing into the storage unit 12.

[0096] Next, refer to Figure 7 The function of the bathtub device 1 according to the first embodiment of the present invention will be explained.

[0097] Figure 7 This is a flowchart illustrating the operation of the bathtub device 1 according to the first embodiment of the present invention. Figure 8 yes Figure 7 The flowchart of the subroutine for the first spray water temperature adjustment mode in the spray water temperature adjustment mode. Figure 9 yes Figure 7 The flowchart of the subroutine for the second spray temperature adjustment mode in the spray temperature adjustment mode. Figure 10 It means Figure 7 A time sequence diagram showing the relationship between the temperature and time of the hot water sprayed from the spray device in the first spray temperature adjustment mode. Figure 11 It means Figure 7 A time sequence diagram showing the relationship between the temperature and time of the hot water sprayed from the spray device in the second spray temperature adjustment mode.

[0098] Figure 7 The flowchart shown illustrates the control process performed through the control unit 16. Figure 7 In the diagram, S illustrates each step.

[0099] First, at the start, the control unit 16 receives an operation input from the bather selecting the water spray temperature adjustment mode of the remote control 18, thus initiating control of the water spray temperature adjustment mode of the bathtub device 1 and proceeding to step S1. Alternatively, the control unit 16 can also initiate the water spray temperature adjustment mode based on its own judgment using a control program stored in its own storage device, regardless of the operation of the remote control 18 by the bather. Furthermore, the water spray temperature adjustment mode can also be initiated from the point where the water spraying device 8 is already in operation in the bathtub device 1. At the start, the solenoid valve 40, the high-temperature solenoid valve 56, and the low-temperature solenoid valve 58 are in the closed state.

[0100] Next, in step S1, the control unit 16 presumes that the bather has started bathing and proceeds to S2. Alternatively, the control unit 16 can detect the start of bathing using a human body sensor or similar means, and determine that the bather has started bathing. Furthermore, at time S1, hot water may be stored in the bathtub body 2 until a predetermined water level W1 is reached; alternatively, if no hot water is stored in the bathtub body 2 at time S1, the control unit 16 may supply hot water from the water heater 52 to the bathtub body 2 until time up to S2, supplying hot water until the predetermined water level W1 is reached.

[0101] In step S2, the control unit 16 starts the water spray from the spray device 8 at time t0, initiating the circulation of hot water in the shoulder area, and proceeds to step S3. In step S2, the control unit 16 starts the first pump 6 to initiate the water spray from the spray device 8, drawing hot water from the bathtub body 2 from the water inlet 9b and pumping it downstream via the first pump 6. When hot water is introduced into the chamber 11 from the spray nozzle 20, the hot water in the inlet flow path 4b is introduced into the spray device side flow path 4c through the chamber 11. The hot water flowing into the spray device side flow path 4c is sprayed from the spray device 8 into the bathtub body 2, circulating within the bathtub body 2. The hot water sprayed from the spray device 8 can, for example, wash over the head, shoulders, and upper body of a bather sitting in the bathtub body 2 with their back facing the spray device 8, allowing the bather to enjoy a hot water shoulder bath.

[0102] In step S3, the control unit 16 obtains the temperature of the hot water sprayed from the spray device 8 via the first temperature sensor 22 and uses this temperature as the temperature of the hot water inside the bathtub body 2. It then determines whether the temperature of the hot water inside the bathtub body 2 detected by the first temperature sensor 22 is higher than a predetermined temperature range T (refer to...). Figure 10The upper limit temperature T2 of the bathtub body 2 is determined. In step S3, no hot or cold water is supplied from the water supply path 10 to the circulation path 4. The hot water in the bathtub body 2 is circulated by spraying water from the spray device 8 through the circulation path 4 and returning to the bathtub body 2. Therefore, the first temperature sensor 22 can detect the temperature of the hot water in the bathtub body 2 on the circulation path 4. Alternatively, the temperature of the hot water in the bathtub body 2 can be detected by a temperature detection unit installed at a location other than the first temperature sensor 22, such as inside the bathtub body 2. If the temperature of the hot water in the bathtub body 2 detected by the first temperature sensor 22 is below the upper limit temperature T2 of the specified temperature range T, the control unit 16 can determine that the temperature of the hot water in the bathtub body 2 is relatively low, and there is no need to execute the first spray temperature adjustment mode in the spray temperature adjustment mode, so it proceeds to S4. If the temperature of the hot water in the bathtub body 2, detected by the first temperature sensor 22, is higher than the upper limit temperature T2 of the specified temperature range T, the control unit 16 can determine that executing the first spray temperature adjustment mode within the spray temperature adjustment mode is effective in suppressing dizziness and sudden chilling after bathing, and proceeds to S5. For example, in Figure 10 The temperature of the hot water in the bathtub body 2, which is higher than the upper limit temperature T2, is exemplified as temperature T3. In this embodiment, the specified temperature range T is a recommended temperature range where bathers can comfortably warm up, preferably set to a temperature range of approximately 38°C to approximately 40°C. In this case, the upper limit temperature T2 of the specified temperature range T is set to approximately 40°C, and the lower limit temperature T1 of the specified temperature range T is set to approximately 38°C. The specified temperature range T, as a recommended temperature range where bathers can comfortably warm up, can be set within any range.

[0103] In step S4, the control unit 16 obtains the temperature of the hot water sprayed from the spray device 8 via the first temperature sensor 22 as the temperature of the hot water inside the bathtub body 2, and determines whether the temperature T5 of the hot water inside the bathtub body 2 detected by the first temperature sensor 22 is lower than the lower limit temperature T1 of the specified temperature range T. At this time, in step S4, no hot or cold water is supplied from the water supply path 10 to the circulation path 4, and the hot water inside the bathtub body 2 circulates by being sprayed from the spray device 8 through the circulation path 4 and returning to the bathtub body 2. Therefore, the first temperature sensor 22 can detect the temperature of the hot water inside the bathtub body 2 on the circulation path 4. If the temperature of the hot water inside the bathtub body 2 detected by the first temperature sensor 22 is above the lower limit temperature T1 of the specified temperature range T, the control unit 16 can determine that the temperature of the hot water inside the bathtub body 2 is relatively high, and there is no need to execute the second spray temperature adjustment mode (warm bath mode) in the spray temperature adjustment mode, so it proceeds to S7. When the temperature of the hot water in the bathtub body 2, detected by the first temperature sensor 22, is lower than the lower limit temperature T1 of the specified temperature range T, the control unit 16 can determine that the second spray temperature adjustment mode (warm bath mode) in the spray temperature adjustment mode should be executed, and proceed to S6. For example, in Figure 11 In this example, the temperature of the hot water in the bathtub body 2, which is lower than the lower limit temperature T1, is denoted as temperature T5.

[0104] In step S5, the control unit 16 executes the subroutine of the first spray temperature adjustment mode within the spray temperature adjustment modes. As a result, the control unit 16 causes... Figure 8 The subroutine for the first water spray temperature adjustment mode shown in the figure begins, and proceeds to S11.

[0105] In step S6, the control unit 16 executes the subroutine of the second spray temperature adjustment mode within the spray temperature adjustment modes. As a result, the control unit 16 causes... Figure 9 The subroutine for the second water spray temperature adjustment mode shown in the figure begins and proceeds to S21.

[0106] In step S11, the control unit 16 determines whether the time has passed. Figure 10The time elapsed from time t0 to time t1 is shown. If the elapsed time from time t0 has not exceeded time t1, the control unit 16 can determine that no predetermined time has elapsed since the start of the water spraying from the water spraying device 8, and therefore returns to S11 in order to suppress a sudden temperature change for the naked bather. If the elapsed time from time t0 has exceeded time t1, the control unit 16 can determine that a predetermined time has elapsed since the start of the water spraying from the water spraying device 8, and the naked bather has become accustomed to the temperature of the hot water sprayed from the water spraying device 8, and therefore proceeds to S12. During the period when the elapsed time of step S11 does not exceed time t1, the control unit 16 determines the temperature of the hot or cold water stored in the storage unit 12 required in the subsequent S13 to lower the temperature of the hot water sprayed from the spray device 8 from the temperature T3 of the hot water in the bathtub body 2 to temperature T2. It controls the high-temperature side solenoid valve 56 and / or the low-temperature side solenoid valve 58 to store hot or cold water of the determined temperature in the storage unit 12. The control unit 16 can estimate the flow rate of the hot water flowing in the circulation path 4, for example, the flow rate of the hot water in the jet-side flow path 4a and the spray device-side flow path 4c, based on the rotational speed or output of the first pump 6. For example, the control unit 16 can estimate the flow rate of the hot water flowing in the spray device-side flow path 4c as the circulation flow rate. Conversely, the control unit 16 can also estimate the water supply volume of hot water, etc., from the water supply path 10 based on the rotational speed or output of the second pump 14. Therefore, the control unit 16 can determine the temperature of the hot or cold water in the storage unit 12 required to change the temperature of the hot water in the circulation path 4 from T3 to T2 in the subsequent S13.

[0107] In step S12, the control unit 16 determines whether the process has not been completed. Figure 10 The specified time from time t0 to time t3 is shown. Control unit 16 proceeds to step S14 to enable control that, if time t3 has elapsed since the specified time from time t0, hot water at temperature T2 has been sprayed from the spray device 8 up to time t3, and after time t3, the temperature gradually decreases within the specified temperature range T, continuously providing a cooling sensation and a stimulating feeling of temperature change. If time t3 has not elapsed since the specified time from time t0, the temperature of the hot water in the bathtub body is temperature T3, which is higher than the upper limit of the specified temperature range T2, and hot water at temperature T3 has been sprayed from the spray device 8. Therefore, it can be determined that lowering the temperature of the hot water directly in contact with the upper body of the bather is effective in suppressing dizziness in the bather, and thus proceeds to step S13.

[0108] In step S13, the control unit 16 supplies hot or cold water with a temperature lower than the temperature T3 of the hot water in the bathtub body 2 detected by the first temperature sensor 22 from the water supply path 10 to the circulation path 4, thereby changing the temperature of the hot water sprayed from the spray device 8 to temperature T2. During S11, the control unit 16 determines the temperature of the hot or cold water stored in the storage section 12 required to lower the temperature of the hot water sprayed from the spray device 8 from the temperature T3 of the hot water in the bathtub body 2 to temperature T2, and controls the high-temperature side solenoid valve 56 and / or the low-temperature side solenoid valve 58 to store hot or cold water of the determined temperature in the storage section 12. As a result, the control unit 16 sets the solenoid valve 40 from the closed state to the open state, driving the second pump 14 to supply water from the water supply path 10 to the circulation path 4. As a result, the temperature T3 of the hot water in the circulation path 4 is lowered to temperature T2 due to the supply of hot or cold water with a temperature lower than temperature T3 from the water supply path 10. The control unit 16 lowers the temperature of the hot water sprayed from the water spray device 8 to temperature T2 earlier, thus reducing the likelihood of dizziness for the bather. Furthermore, during the period before time t1 elapses in step S11, the control unit 16 prepares hot or cold water of the predetermined temperature in the storage unit 12, thus enabling it to lower the temperature of the sprayed hot water from temperature T3 to temperature T2 earlier in S13.

[0109] In the water spray temperature adjustment mode, the control unit 16 supplies hot or cold water (lower than the temperature T3 of the hot water in the bathtub body 2) from the water supply path 10 to the circulation path 4 in a manner that reduces the temperature of the hot water sprayed from the spray device 8 from the temperature of the hot water in the bathtub body 2 to a temperature within a specified temperature range T in multiple stages. For example, in the first stage of multiple stages, the control unit 16 reduces the temperature of the hot water sprayed from the spray device 8 from the temperature T3 of the hot water in the bathtub body 2 to a temperature T2, and in the second stage of multiple stages, as shown in S14, reduces the temperature of the hot water sprayed from the spray device 8 within the specified temperature range T. Thus, the temperature of the sprayed hot water is reduced to a temperature within the specified temperature range T in multiple stages. Therefore, compared to the case where the temperature of the hot water sprayed from the spray device is reduced all at once, reducing the temperature of the hot water in multiple stages allows for a reduction in the temperature of the sprayed hot water without causing physical strain to the bather. After the control unit 16 changes the temperature of the hot water sprayed from the water spraying device 8 to temperature T2 in step S13, it enters the return of the subroutine of the first water spraying temperature adjustment mode.

[0110] For example, from time t2 until time t3, control unit 16 keeps the temperature of the hot water sprayed from the spraying device 8 approximately constant at temperature T2. As described above, the spraying temperature adjustment mode of control unit 16 has a temperature change suppression control as a temperature reduction suppression control, that is, between the first stage C1 and the second stage C2 of multiple stages, the temperature decrease is less than either the temperature decrease in the first stage C1 or the second stage C2. In the temperature change suppression control, control unit 16, for example, keeps the temperature of the hot water sprayed from the spraying device 8 approximately constant at temperature T2. The temperature change suppression control is performed in the third stage C3 between the first stage C1 and the second stage C2. The temperature change suppression control achieves spraying with little or no temperature change during the time from time t2 to time t3 in the third stage C3. In stage 3 (C3), the temperature change suppression control is preferably set to a temperature change within the range of upper limit temperature T2 + 0.5°C to upper limit temperature T2 - 0.5°C, for example, within the range of approximately 40.5°C to approximately 39.5°C. In the spray temperature adjustment mode of control unit 16, the execution time B3 of the temperature change suppression control is longer than the fall time B1 in stage 1 (C1). In the spray temperature adjustment mode of control unit 16, the execution time B3 of the temperature change suppression control is shorter than the fall time B2 in stage 2 (C2).

[0111] In step S14, the control unit 16 changes the temperature of the hot water sprayed from the spray device 8 to a temperature lower than the temperature of the hot water currently being sprayed, as detected by the first temperature sensor 22. At this time, the control unit 16 slowly lowers the temperature of the hot water sprayed from the spray device 8 within a predetermined temperature range T. Specifically, the control unit 16 determines the temperature of the hot or cold water stored in the storage unit 12 required to further lower the temperature of the hot water sprayed from the spray device 8, and controls the high-temperature side solenoid valve 56 and / or the low-temperature side solenoid valve 58 to store hot or cold water at the determined temperature in the storage unit 12. When hot water or the like is stored in the storage unit 12 at a certain temperature, the control unit 16 controls the high-temperature side solenoid valve 56 and / or the low-temperature side solenoid valve 58 to adjust the temperature of the hot water or the like in the storage unit 12. Since the solenoid valve 40 is in the open state, the control unit 16 drives the second pump 14 to supply water from the water supply path 10 to the circulation path 4. Therefore, the temperature T2 of the hot water in the circulation path 4 is gradually reduced to an even lower temperature by the supply of hot or cold water from the water supply path 10, which has a temperature lower than T2. ​​The control unit 16 gradually changes the temperature of the hot water sprayed from the spray device 8 to a lower temperature, and proceeds to step S15.

[0112] In the water spray temperature adjustment mode of the control unit 16, hot or cold water with a temperature lower than that of the hot water in the bathtub body 2 is supplied from the water supply path 10 to the circulation path 4 in such a way that the rate of temperature decrease R1 of the hot water sprayed from the water spray device 8 in the first stage C1 is greater than the rate of temperature decrease R2 in the second stage C2. The rate of temperature decrease R1 is calculated by (temperature T3 - temperature T2) / (the time of temperature decrease from time t1 to time t2). Time t2 is the time when the temperature of the hot water sprayed from the water spray device 8 reaches temperature T2. Similarly, the rate of temperature decrease R2 is calculated by (temperature T2 - temperature T4) / (the time of temperature decrease from time t3 to time t4). Furthermore, the rate of temperature decrease R2 can be arbitrarily set by a value smaller than the rate of temperature decrease R1. For example, the control unit 16 can adjust the temperature of the hot water sprayed from the water spray device 8 so that the temperature T4 of the hot water sprayed from the water spray device 8 at time t4 is a value near the center value within a specified temperature range T. Furthermore, at time t4, temperature T4 can be located in the lower half of the range compared to the central value within the specified temperature range T, or it can be located in the upper half of the range.

[0113] In the water spray temperature adjustment mode of the control unit 16, the temperature drop time B1 of the hot water sprayed from the water spray device 8 in the first stage is shorter than the drop time B2 in the second stage, so that hot water or cold water with a temperature lower than that of the hot water in the bathtub body 2 is supplied from the water supply path 10 to the circulation path 4. The drop time B1 is the drop time from time t1 to time t2, and the drop time B2 is the drop time from time t3 to time t4.

[0114] In step S15, the control unit 16 determines whether the temperature of the hot water sprayed from the water spray device 8 is above the lower limit temperature T1. If the temperature of the hot water sprayed from the water spray device 8 is not above the lower limit temperature T1, the control unit 16 proceeds to S16 to prevent the temperature of the hot water sprayed from the water spray device 8 from dropping excessively and causing discomfort to the bather. If the temperature of the hot water sprayed from the water spray device 8 is above the lower limit temperature T1, the control unit 16 determines that the temperature of the continuously sprayed hot water should be gradually reduced so that the bather continuously feels the temperature drop and can continuously bring a sense of coolness and temperature change stimulation, and then proceeds to return to the subroutine of the first water spray temperature adjustment mode.

[0115] In step S16, the control unit 16 determines that the temperature of the hot water sprayed from the water spray device 8 has dropped excessively, and it is necessary to prevent the water from not being able to provide warmth to the bather. Therefore, it stops the supply from the water supply path 10 to the circulation path 4 and sets the control of the water sprayed from the water spray device 8 to be achieved only by the circulation of hot water in the circulation path 4. Then, it enters the return of the subroutine of the first water spray temperature adjustment mode.

[0116] If the control unit 16 returns to the subroutine that has reached the first spray water temperature adjustment mode, it will return to... Figure 7 S5 proceeds to S7 in order to continue subsequent processing.

[0117] In step S7, the control unit 16 determines whether a predetermined time from time t0 to time t4 has elapsed. Time t4 is preset in the control unit 16. If the elapsed time from time t0 has not exceeded time t4, the control unit 16 proceeds to S8. If the elapsed time from time t0 has exceeded t4, the control unit 16 determines that the water spraying in the water spray temperature adjustment mode has continued for a certain period of time, adjusting the water spray temperature while spraying water sufficient to warm the deep parts of the bather's body. Therefore, in order to stop the water spray temperature adjustment mode, the second pump 14 is stopped, and the solenoid valve 40 is closed, proceeding to S9.

[0118] In step S8, the control unit 16 determines whether it has received a stop instruction for the water spray temperature adjustment mode via the operation input of the remote control 18. If the control unit 16 does not receive a stop instruction for the water spray temperature adjustment mode, it returns to S3 in order to continue executing the control of the water spray temperature through the water spray temperature adjustment mode. If the control unit 16 receives a stop instruction for the water spray temperature adjustment mode, it can determine that the bather intends to stop the water spray temperature adjustment mode, and therefore proceeds to S9.

[0119] In step S9, the control unit 16 stops the first pump 6, thereby stopping the water spray from the water spraying device 8, and the process ends.

[0120] When the process enters or ends, the control unit 16 terminates a series of control processes.

[0121] In step S21, the control unit 16 determines whether a predetermined time from time t0 to time t11 has elapsed. If the elapsed time from time t0 has not exceeded time t11, the control unit 16 determines that no predetermined time has elapsed since the start of the water spraying from the water spraying device 8, and therefore returns to S21 to suppress a sudden temperature change for the naked bather. If the elapsed time from time t0 has exceeded t11, the control unit 16 determines that a predetermined time has elapsed since the start of the water spraying from the water spraying device 8, and the naked bather has become accustomed to the temperature of the hot water sprayed from the water spraying device 8, and therefore proceeds to S22. Furthermore, during the period when the elapsed time of step S21 does not exceed time t11, the control unit 16 determines the temperature of the hot or cold water stored in the storage unit 12 required in the subsequent S23 to raise the temperature of the hot water sprayed from the water spraying device 8 from the temperature T5 of the hot water in the bathtub body 2 to the temperature T1. This is achieved by controlling the high-temperature side solenoid valve 56 and / or the low-temperature side solenoid valve 58 to store hot or cold water of the determined temperature in the storage unit 12. The control unit 16 can estimate the flow rate of the hot water flowing in the circulation path 4, for example, the flow rate of the hot water in the jet-side flow path 4a and the water spraying device side flow path 4c, based on the rotational speed or output of the first pump 6. For example, the control unit 16 can estimate the flow rate of the hot water flowing in the water spraying device side flow path 4c as the circulation flow rate. Conversely, the control unit 16 can also estimate the water supply volume of the hot water, etc., from the water supply path 10 based on the rotational speed or output of the second pump 14. Therefore, the control unit 16 can determine the temperature of the hot or cold water in the storage unit 12 required in the subsequent S23 to change the temperature of the hot water in the circulation path 4 from T5 to T1.

[0122] In step S22, the control unit 16 determines whether the predetermined time from time t0 to time t13 has elapsed. If the elapsed time from time t0 exceeds time t13, the control unit 16 can determine that hot water at temperature T1 has been sprayed from the water spray device 8 up to time t13, and that the temperature gradually rises within the predetermined temperature range T after time t13, providing a continuous sensation of warmth and temperature change, thus the control is effective, and proceeds to step S24. If the elapsed time from time t0 does not exceed time t13, since the temperature of the hot water in the bathtub body is temperature T5, which is lower than the lower limit temperature T1 of the predetermined temperature range T, and hot water at temperature T5 is being sprayed from the water spray device 8, the control unit 16 can determine that raising the temperature of the hot water in direct contact with the upper body of the bather is effective in warming the bather, and therefore proceeds to step S23.

[0123] In step S23, the control unit 16 supplies hot or cold water with a temperature higher than the temperature T5 of the hot water in the bathtub body 2 detected by the first temperature sensor 22 from the water supply path 10 to the circulation path 4, thereby changing the temperature of the hot water sprayed from the spray device 8 to temperature T1. During S21, the control unit 16 determines the temperature of the hot or cold water stored in the storage section 12 required to raise the temperature of the hot water sprayed from the spray device 8 from the temperature T5 of the hot water in the bathtub body 2 to temperature T1, and controls the high-temperature side solenoid valve 56 and / or the low-temperature side solenoid valve 58 to store hot or cold water of the determined temperature in the storage section 12. As a result, the control unit 16 sets the solenoid valve 40 from the closed state to the open state, driving the second pump 14 to supply water from the water supply path 10 to the circulation path 4. As a result, the temperature T5 of the hot water in the circulation path 4 is increased to temperature T1 by the supply of hot or cold water with a temperature higher than temperature T5 from the water supply path 10. As described above, during the period when the elapsed time of step S21 does not exceed time t11, the control unit 16 prepares hot or cold water of the determined temperature in advance in the storage unit 12, so that the temperature of the hot water sprayed out can be raised from temperature T5 to temperature T1 earlier in S23.

[0124] In the water spray temperature adjustment mode, the control unit 16 supplies hot water or cold water with a temperature higher than the temperature T5 of the hot water in the bathtub body 2 to the circulation path 4 in a manner that raises the temperature of the hot water sprayed from the spray device 8 from the temperature T5 of the hot water in the bathtub body 2 in multiple stages until it reaches a temperature within a specified temperature range T. For example, as the first stage C11 of the multiple stages, the control unit 16 raises the temperature of the hot water sprayed from the spray device 8 from the temperature T5 of the hot water in the bathtub body 2 to a temperature T1, and as the second stage C12 of the multiple stages, as shown in S24, raises the temperature of the hot water sprayed from the spray device 8 within the specified temperature range T. Thus, the temperature of the sprayed hot water rises in multiple stages until it reaches a temperature within the specified temperature range T. Therefore, compared to the case where the temperature of the hot water sprayed from the spray device rises all at once, raising the temperature of the hot water in multiple stages allows for a gradual increase in the temperature of the sprayed hot water without causing discomfort to the bather. After the control unit 16 changes the temperature of the hot water sprayed from the water spraying device 8 to temperature T1, it enters the return of the subroutine of the first water spraying temperature adjustment mode.

[0125] For example, from time t12 until time t13, control unit 16 maintains a substantially constant temperature (T1) for the hot water sprayed from the spraying device 8. As described above, the spraying temperature adjustment mode of control unit 16 includes temperature change suppression control as a temperature rise suppression control, meaning that between the first stage C11 and the second stage C12, the temperature rise is less than either the temperature rise in the first stage C11 or the second stage C12. In the temperature change suppression control, control unit 16, for example, maintains a substantially constant temperature (T2) for the hot water sprayed from the spraying device 8. The temperature change suppression control is performed in the third stage C13 between the first stage C11 and the second stage C12. The temperature change suppression control achieves minimal or almost no temperature change during the third stage C13 time period from time t12 to time t13. In stage 3 C13, the temperature change suppression control is preferably set to a temperature change within the range of upper limit temperature T1 + 0.5°C to upper limit temperature T1 - 0.5°C, for example, approximately 38.5°C to approximately 37.5°C. In the spray temperature adjustment mode of control unit 16, the execution time B13 of the temperature change suppression control is longer than the rise time B11 in stage 1 C11. In the spray temperature adjustment mode of control unit 16, the execution time B13 of the temperature change suppression control is shorter than the rise time B12 in stage 2 C12.

[0126] In step S24, the control unit 16 changes the temperature of the hot water sprayed from the spray device 8 to a temperature higher than the temperature of the hot water currently being sprayed, as detected by the first temperature sensor 22. At this time, the control unit 16 slowly raises the temperature of the hot water sprayed from the spray device 8 within a predetermined temperature range T. Specifically, the control unit 16 determines the temperature of the hot or cold water stored in the storage unit 12 required to further raise the temperature of the hot water sprayed from the spray device 8, and controls the high-temperature side solenoid valve 56 and / or the low-temperature side solenoid valve 58 to store hot or cold water at the determined temperature in the storage unit 12. When hot water or the like is stored in the storage unit 12 at a certain temperature, the high-temperature side solenoid valve 56 and / or the low-temperature side solenoid valve 58 are controlled to adjust the temperature of the hot water or the like in the storage unit 12. The control unit 16 sets the solenoid valve 40 to the open state, driving the second pump 14 to supply water from the water supply path 10 to the circulation path 4. Therefore, the temperature T1 of the hot water in the circulation path 4 is gradually reduced to a higher temperature by the supply of hot or cold water from the water supply path 10, which has a temperature higher than T5. The control unit 16 gradually changes the temperature of the hot water sprayed from the spray device 8 to a higher temperature, and proceeds to step S25.

[0127] In the water spray temperature adjustment mode of the control unit 16, hot or cold water with a temperature higher than that of the hot water sprayed from the spray device 8 is supplied from the water supply path 10 to the circulation path 4 in such a way that the rate of increase R11 of the hot water temperature sprayed from the spray device 8 in the first stage C11 of multiple stages is greater than the rate of decrease R12 in the second stage. The rate of increase R11 is calculated by (temperature T1 - temperature T5) / (the rise time from time t11 to time t12). Time t12 is the time when the temperature of the hot water sprayed from the spray device 8 reaches temperature T1. Similarly, the rate of increase R12 is calculated by (temperature T2 - temperature T1) / (the rise time from time t13 to time t15). Furthermore, the rate of increase R12 can be arbitrarily set to a value smaller than the rate of increase R11. For example, at time t15, the temperature of the hot water sprayed from the spray device 8 reaches the upper limit temperature T2 of a specified temperature range T. Additionally, for example, at time t15, the temperature of the hot water sprayed from the water spraying device 8 can be located in the upper half above the center value of the specified temperature range T, or it can be located in the lower half below.

[0128] In the water spray temperature adjustment mode of the control unit 16, the rise time B11 of the hot water sprayed from the water spray device 8 in the first stage C11 is shorter than the rise time B12 in the second stage C12, so that hot water or cold water with a temperature higher than that of the hot water in the bathtub body 2 is supplied from the water supply path 10 to the circulation path 4. The rise time B11 is the rise time from time t11 to time t12, and the rise time B12 is the rise time from time t13 to time t15 (or time t4).

[0129] In step S25, the control unit 16 determines whether the temperature of the hot water sprayed from the water spray device 8 is below the upper limit temperature T2. If the temperature of the hot water sprayed from the water spray device 8 is not below the upper limit temperature T2, the control unit 16 proceeds to S26 to prevent the temperature of the hot water sprayed from the water spray device 8 from rising excessively and causing discomfort to the bather. If the temperature of the hot water sprayed from the water spray device 8 is below the upper limit temperature T2, the control unit 16 determines that the temperature of the continuously sprayed hot water should gradually increase so that the bather can continuously feel the temperature rise and continuously experience the stimulation of warmth and temperature change, and then proceeds to return to the subroutine of the second water spray temperature adjustment mode.

[0130] In step S26, the control unit 16 determines that the temperature of the hot water sprayed from the water spray device 8 has risen excessively, and it is necessary to prevent discomfort to the bather, for example... Figure 11As shown, the supply from the water supply path 10 to the circulation path 4 is stopped, and the control of the water spraying from the spraying device 8 is set to be achieved only by the circulation of hot water in the circulation path 4. The process then returns to the subroutine of the second spraying temperature adjustment mode.

[0131] If the control unit 16 returns to the subroutine that has reached the second spray water temperature adjustment mode, it will return to... Figure 7 S7 is entered in order to continue subsequent processing.

[0132] In the first embodiment of the present invention configured as described above, the control unit 16 has a water spray temperature adjustment mode in which, when the temperature of the hot water in the bathtub body 2 detected by the first temperature sensor 22 is higher than the upper limit temperature T2 of a predetermined temperature range T, water is sprayed from the spray device 8 toward the bathtub body 2 for a predetermined time period from receiving the control start command, so that the hot water taken from the water inlet 9b is circulated. After a predetermined time, the temperature adjustment unit 7 lowers the temperature of the hot water sprayed from the spray device 8 to within the predetermined temperature range T. Thus, even if the bather wishes to bathe at a temperature higher than the recommended temperature range (i.e., the upper limit temperature T2 of the predetermined temperature range T) where the bather can comfortably warm up, water is sprayed from the spray device 8 without adjusting the temperature of the hot water in the bathtub body 2 to within the predetermined temperature range T, so that the temperature of the hot water in direct contact with the upper body of the bather, such as the neck and shoulders, is lowered to within the predetermined temperature range T. This can suppress dizziness in the bather and allow for a longer bathing time. In addition, during the specified time period from the start of the control of the water spray temperature adjustment mode, water is sprayed from the water spray device 8 so that the hot water taken from the water inlet 9b is circulated, which can suppress the sudden temperature change to the naked bather and make the bath less burdensome to the bather's body.

[0133] In the first embodiment of the present invention configured as described above, in the water spray temperature adjustment mode, the control unit 16, through the temperature adjustment unit 7, reduces the temperature of the hot water sprayed from the water spray device 8 from the temperature of the hot water in the bathtub body 2 in multiple stages until it reaches a target temperature within a predetermined temperature range T. This allows the temperature of the hot water sprayed from the water spray device 8 to be reduced in multiple stages, thus reducing the temperature of the sprayed water while minimizing the burden on the bather's body. Furthermore, for example, if the temperature adjustment unit 7 has a water supply path 10 connected to the circulation path 4 and supplying hot or cold water from an external supply source, in the water spray temperature adjustment mode, the control unit 16 supplies hot or cold water, which is lower in temperature than the hot water in the bathtub body 2, from the water supply path 10 to the circulation path 4 in a manner that reduces the temperature of the hot water sprayed from the water spray device 8 from the temperature of the hot water in the bathtub body 2 in multiple stages until it reaches a target temperature within a predetermined temperature range T. This also allows the temperature of the hot water sprayed from the water spray device 8 to be reduced in multiple stages, thus minimizing the burden on the bather's body.

[0134] In the first embodiment of the present invention configured as described above, in the water spray temperature adjustment mode of the control unit 16, the temperature adjustment unit 7 lowers the temperature of the hot water sprayed from the water spray device 8 in a manner that the rate of decrease in the temperature of the hot water sprayed from the water spray device 8 in the first stage C1 of the plurality of stages is greater than the rate of decrease in the second stage C2. Therefore, in the first stage C1 of the plurality of stages, the temperature of the hot water sprayed from the water spray device 8 can be brought closer to the predetermined temperature range T more quickly, bringing the temperature of the sprayed hot water closer to the recommended temperature zone (i.e., the predetermined temperature range) where the bather can comfortably warm up earlier, and then the temperature of the sprayed hot water decreases more slowly thereafter, so that the bather continuously feels the temperature decrease, thereby suppressing the bather's habituation to the spray temperature and continuously providing a stimulating sensation of coolness and temperature change. Furthermore, for example, when the temperature adjustment unit 7 has a water supply path 10 connected to the circulation path 4 and supplying hot or cold water from an external supply source, in the spray temperature adjustment mode of the control unit 16, the rate of decrease in the temperature of the hot water sprayed from the spray device 8 in the first stage C1 of the multiple stages is greater than the rate of decrease in the second stage C2. This allows hot or cold water with a temperature lower than that of the hot water in the bathtub body 2 to be supplied from the water supply path 10 to the circulation path 4. As a result, in the first stage C1 of the multiple stages, the temperature of the hot water sprayed from the spray device 8 can be brought closer to the specified temperature range T more quickly, and the temperature of the sprayed hot water can be brought closer to the recommended temperature range, i.e., the specified temperature range, where the bather can comfortably warm up, earlier. Then, the temperature of the sprayed hot water decreases more slowly, and the bather continuously feels the temperature decrease, so as to suppress the bather's habituation to the spray temperature and continuously bring a sense of coolness and temperature change stimulation.

[0135] In the first embodiment of the present invention configured as described above, in the water spray temperature adjustment mode of the control unit 16, the temperature adjustment unit 7 lowers the temperature of the hot water sprayed from the water spray device 8 in a manner that the decrease time B1 of the temperature reduction in the first stage C1 is shorter than the decrease time B2 in the second stage C2. Therefore, in the first stage C1, the temperature of the hot water sprayed from the water spray device 8 can approach the predetermined temperature range T in a relatively short time, bringing the temperature of the sprayed hot water closer to the recommended temperature zone (i.e., the predetermined temperature range) where the bather can comfortably warm up earlier, and then the temperature of the sprayed hot water decreases over a relatively long period, allowing the bather to continuously feel the temperature reduction. This suppresses the bather's habituation to the spray temperature and provides a continuous sensation of coolness and temperature change. Furthermore, in the initial first stage C1, the time for bringing temperature change to a naked bather is relatively short, while in the subsequent second stage C2, the time for bringing temperature change to the bather is made longer. This allows for a reduction in the temperature of the hot water sprayed from the water jet without putting strain on the bather's body. Additionally, for example, when the temperature adjustment unit 7 has a water supply path 10 connected to the circulation path 4 and supplying hot or cold water from an external source, in the spray temperature adjustment mode of the control unit 16, the temperature of the hot water sprayed from the spray device 8 is reduced by shortening the decrease time B1 of the hot water sprayed from the spray device 8 in the first stage C1 compared to the decrease time B2 in the second stage C2. Therefore, in the first stage C1 of the multiple stages, the temperature of the hot water sprayed from the water spray device 8 can be brought close to the specified temperature range T in a relatively short time, so that the temperature of the hot water sprayed is close to the recommended temperature range, i.e., the specified temperature range, where the bather can comfortably warm up, earlier. Then, the temperature of the hot water sprayed is lowered over a relatively long period, so that the bather continuously feels the temperature drop, thus suppressing the bather's habituation to the water temperature and providing a sustained sensation of coolness and temperature change. Furthermore, while the initial first stage C1 provides a relatively short time for the temperature change to a naked bather, the subsequent second stage C2 provides a longer time for the temperature change, thereby achieving a lowering of the hot water temperature while minimizing the burden on the bather's body.

[0136] In the first embodiment of the present invention configured as described above, the water spray temperature adjustment mode of the control unit 16 has the following temperature change suppression control: between the first stage C1 and the second stage C2 of the plurality of stages, the temperature decrease is less compared to either the first stage C1 or the second stage C2. Therefore, in the first stage C1, the opportunity for the bather to temporarily adjust to the lowered water spray temperature after the temperature of the hot water sprayed from the water spray device 8 has been lowered can be provided, making it less likely to burden the bather's body. Furthermore, the temperature of the hot water sprayed in the second stage C2 is lowered after the bather's body has adjusted to the further lowered water spray temperature in the first stage C1, thus making it less likely to burden the bather's body.

[0137] In the first embodiment of the present invention configured as described above, in the water spray temperature adjustment mode of the control unit 16, the execution time B3 of the temperature change suppression control is longer than the decrease time B1 in the first stage C1. Therefore, the execution time of the temperature change suppression control after the bather has temporarily lowered the water spray temperature can be set longer, making it less likely to burden the bather's body.

[0138] In the first embodiment of the present invention configured as described above, in the water spray temperature adjustment mode of the control unit 16, the execution time B3 of the temperature change suppression control is shorter than the drop time B2 in the second stage C2. This ensures that the execution time of the temperature change suppression control is sufficient to allow the bather to adjust to the temporarily lowered water spray temperature, and further lengthens the drop time B2 in the second stage C2, thereby achieving a reduction in the temperature of the hot water sprayed out while minimizing strain on the bather's body.

[0139] In the first embodiment of the present invention configured as described above, the control unit 16 has the following water spray temperature adjustment mode: when the temperature of the hot water in the bathtub body 2 detected by the first temperature sensor 22 is higher than the upper limit temperature T2 of the predetermined temperature range T, water is sprayed from the water spray device 8 toward the bathtub body 2 for a predetermined time period from receiving the start control command, so that the hot water taken from the water inlet 9b is circulated. After a predetermined time, hot water or cold water with a temperature lower than the temperature of the hot water in the bathtub body 2 detected by the first temperature sensor 22 is supplied from the water supply path 10 to the circulation path 4, so that the temperature of the hot water sprayed from the water spray device 8 is reduced to within the predetermined temperature range T. Therefore, even if the bather wishes to bathe at a temperature higher than the upper limit of the preferred temperature range T in the bathtub body 2 (e.g., the upper limit T2 of the preferred temperature range T), water will be sprayed from the spray device 8 to lower the temperature of the water in direct contact with the bather's upper body, such as the neck and shoulders, to within the preferred temperature range T, thus suppressing dizziness and allowing for a longer bathing time. Furthermore, during the predetermined time period from the start of the spray temperature adjustment mode control, water is sprayed from the spray device 8 to circulate the hot water taken from the water inlet 9b, suppressing drastic temperature changes for the naked bather and ensuring a less stressful bathing experience.

[0140] In the first embodiment of the present invention configured as described above, the control unit 16 has a water spray temperature adjustment mode in which, when the temperature of the hot water in the bathtub body 2 detected by the first temperature sensor 22 is lower than the lower limit temperature T5 of a predetermined temperature range T, water is sprayed from the spray device 8 toward the bathtub body 2 for a predetermined time period from receiving the control start command, so that the hot water taken from the water inlet 9b is circulated. After a predetermined time, the temperature adjustment unit 7 raises the temperature of the hot water sprayed from the spray device 8 to within the predetermined temperature range T. Thus, for example, when the bather wishes to bathe at a temperature lower than the lower limit temperature T5 of the predetermined temperature range T, the temperature of the hot water in the bathtub body 2 is set to a relatively low temperature to maintain a comfortable bathing temperature for the bather, and the temperature of the hot water sprayed from the spray device 8 that is in direct contact with the upper body of the bather, such as the neck and shoulders, is raised to within the predetermined temperature range T, thereby locally warming the bather. Therefore, bathers can enjoy a comfortable bathing temperature while being warmed by gentle water spray that does not burden their bodies. Furthermore, during a predetermined period after the start of the water spray temperature adjustment mode, water is sprayed from the spray device to circulate the hot water taken from the water inlet 9b, preventing sudden temperature changes for naked bathers and ensuring a comfortable bathing experience.

[0141] In the first embodiment of the present invention configured as described above, in the water spray temperature adjustment mode, the control unit 16, through the temperature adjustment unit 7, reduces the temperature of the hot water sprayed from the water spray device 8 from the temperature of the hot water in the bathtub body 2 in multiple stages until it reaches a target temperature within a predetermined temperature range T. This allows the temperature of the hot water sprayed from the water spray device 8 to be reduced in multiple stages, thus reducing the temperature of the sprayed water while minimizing the burden on the bather's body. Furthermore, for example, if the temperature adjustment unit 7 has a water supply path 10 connected to the circulation path 4 and supplying hot or cold water from an external supply source, in the water spray temperature adjustment mode, the control unit 16 supplies hot or cold water, which is lower in temperature than the hot water in the bathtub body 2, from the water supply path 10 to the circulation path 4 in a manner that reduces the temperature of the hot water sprayed from the water spray device 8 from the temperature of the hot water in the bathtub body 2 in multiple stages until it reaches a target temperature within a predetermined temperature range T. This also allows the temperature of the hot water sprayed from the water spray device 8 to be reduced in multiple stages, thus minimizing the burden on the bather's body.

[0142] In the first embodiment of the present invention configured as described above, in the water spray temperature adjustment mode of the control unit 16, the temperature adjustment unit 7 increases the temperature of the hot water sprayed from the water spray device 8 in a manner that increases the rate of increase of the temperature of the hot water in the first stage compared to the rate of increase in the second stage. Therefore, in the first stage of the multiple stages, the temperature of the hot water sprayed from the water spray device 8 can be brought closer to the predetermined temperature range T more quickly, allowing the temperature of the sprayed hot water to approach the predetermined temperature range where the bather feels comfortable earlier, and thereafter the temperature of the sprayed hot water increases more steadily, allowing the bather to continuously feel the temperature increase, thus suppressing the bather's habituation to the spray temperature and providing a continuous sense of warmth and temperature change stimulation. Furthermore, for example, when the temperature adjustment unit 7 has a water supply flow path 10 connected to the circulation flow path 4 and supplying hot or cold water from an external supply source, in the spray temperature adjustment mode of the control unit 16, the temperature of the hot water sprayed from the spray device 8 is increased in a manner that the rate of increase of the hot water temperature in the first stage of the multiple stages is greater than the rate of increase in the second stage. Thus, in the first stage of the multiple stages, the temperature of the hot water sprayed from the spray device 8 can be brought closer to the specified temperature range T more quickly, allowing the temperature of the sprayed hot water to approach the recommended temperature zone (i.e., the specified temperature range) where the bather can comfortably warm up earlier, and thereafter the temperature of the sprayed hot water increases more steadily, allowing the bather to continuously feel the temperature rise, thereby suppressing the bather's habituation to the spray temperature and providing a continuous sense of warmth and temperature change stimulation.

[0143] In the first embodiment of the present invention configured as described above, in the water spray temperature adjustment mode of the control unit 16, the temperature adjustment unit 7 raises the temperature of the hot water sprayed from the water spray device 8 in a manner that shortens the rise time of the hot water temperature in the first stage compared to the rise time in the second stage. Therefore, in the first stage, the temperature of the hot water sprayed from the water spray device 8 can approach the predetermined temperature range in a relatively short time, allowing the temperature of the sprayed hot water to approach the predetermined temperature range that makes the bather feel comfortable earlier, and then the temperature of the sprayed hot water is lowered more steadily thereafter, thus suppressing the bather's habituation to the increased water temperature and allowing the bather to continuously feel the temperature rise, providing a sustained sensation of warmth and temperature change stimulation. Furthermore, in the initial first stage, the time for temperature change to occur to a naked bather is relatively short, while in the subsequent second stage, the time for temperature change to occur to occur to the bather is longer, thereby achieving a rise in the temperature of the sprayed hot water while being less burdensome to the bather's body. Furthermore, for example, when the temperature adjustment unit 7 has a water supply flow path 10 connected to the circulation flow path 4 and supplying hot or cold water from an external supply source, in the spray temperature adjustment mode of the control unit 16, the temperature of the hot water sprayed from the spray device 8 is increased in a way that the rise time of the hot water sprayed from the spray device 8 in the first stage of the multiple stages is shorter than the rise time in the second stage. As a result, in the first stage of the multiple stages, the temperature of the hot water sprayed from the spray device 8 can approach the specified temperature range in a relatively short time, so that the temperature of the hot water sprayed from the spray device 8 approaches the recommended temperature range, i.e., the specified temperature range, where the bather can comfortably warm up, earlier, and then the temperature of the hot water sprayed from the spray device 8 decreases more stably thereafter, so as to suppress the bather's habituation to the spray temperature after the temperature rise, so that the bather can continuously feel the temperature rise and continuously bring the stimulation of warmth and temperature change. In addition, the initial first stage involves a shorter time for bringing temperature changes to the naked bather, while the subsequent second stage involves a longer time for bringing temperature changes to the bather. This allows for a rise in the temperature of the hot water sprayed out without putting too much strain on the bather's body.

[0144] In the first embodiment of the present invention configured as described above, the water spray temperature adjustment mode of the control unit 16 has the following temperature change suppression control: the temperature rise is less between the first and second stages among multiple stages compared to either the first or second stage. Therefore, in the first stage, it is possible to allow the bather to acclimate to the temporarily increased water spray temperature after the temperature of the hot water sprayed from the water spray device 8 has risen, thus reducing the burden on the bather's body. Furthermore, the second stage's increase in the temperature of the hot water sprayed after the bather's body has acclimatized to the further increased water spray temperature in the first stage further reduces the burden on the bather's body.

[0145] In the first embodiment of the present invention configured as described above, in the water spray temperature adjustment mode of the control unit 16, the execution time of the temperature change suppression control is longer than the rise time in the first stage. Therefore, the execution time of the temperature change suppression control, where temperature changes are relatively small, can be set longer, making it less likely to burden the bather's body.

[0146] In the first embodiment of the present invention configured as described above, in the water spray temperature adjustment mode of the control unit 16, the execution time of the temperature change suppression control is shorter than the rise time in the second stage. This ensures that the execution time of the temperature change suppression control is short enough to allow the bather to easily adapt to the temporarily increased water spray temperature, and further lengthens the rise time in the second stage, thereby achieving an increase in the temperature of the hot water sprayed out while minimizing strain on the bather's body.

[0147] In the first embodiment of the present invention configured as described above, the control unit 16 has the following water spray temperature adjustment mode: when the temperature of the hot water in the bathtub body 2 detected by the first temperature sensor 22 is lower than the lower limit temperature T5 of the predetermined temperature range T, water is sprayed from the water spray device 8 toward the bathtub body 2 for a predetermined time period from receiving the start control command, so that the hot water taken from the water inlet 9b is circulated. After a predetermined time, hot water or cold water with a temperature higher than the temperature of the hot water in the bathtub body 2 detected by the first temperature sensor 22 is supplied from the water supply path 10 to the circulation path 4, so that the temperature of the hot water sprayed from the water spray device 8 rises to within the predetermined temperature range T. Therefore, for example, if a bather wishes to bathe at a temperature lower than the lower limit T5 of the specified temperature range T, the temperature of the hot water in the bathtub body 2 is set to a relatively low temperature to maintain a comfortable bathing temperature for the bather. Furthermore, the temperature of the hot water sprayed from the spray device 8 that directly contacts the upper body of the bather, such as the neck and shoulders, is raised to within the specified temperature range T, thus locally warming the bather. As a result, the bather can bathe at a comfortable temperature while being warmed by the gentle spray of water that does not burden the bather's body.

[0148] Next, refer to Figures 12 to 17 The bathtub device according to the second embodiment of the present invention will be described.

[0149] The difference between the water spraying device in this embodiment and the first embodiment described above lies in the temperature adjustment of the hot water sprayed from the water spraying unit after the initial spraying, and the structure for performing temperature adjustment. Therefore, only the differences between the second embodiment and the first embodiment of the present invention will be described below, and descriptions of identical structures, functions, and effects will be omitted.

[0150] Figure 12 This is a diagram illustrating the hot water supply system in the bathtub apparatus according to the second embodiment of the present invention. Figure 13 This is a flowchart illustrating the function of the bathtub device according to the second embodiment of the present invention. Figure 14 From Figure 13 The flowchart shown calls a subroutine that represents the processing in the first water spray temperature adjustment mode. Figure 15 From Figure 13 The flowchart shown calls a subroutine that represents the processing in the second water spray temperature adjustment mode. Figure 16 This is a timing diagram showing the temperature change of hot water sprayed from the spray section in the bathtub device according to the second embodiment of the present invention when the first spray temperature adjustment mode is executed. Figure 17This is a timing diagram showing the temperature change of hot water sprayed from the spray section in the bathtub device according to the second embodiment of the present invention when the second spray temperature adjustment mode is executed.

[0151] like Figure 12 As shown, the bathtub device 101 according to the second embodiment of the present invention includes: a bathtub body 102; a bathtub spray nozzle 109a disposed on the bathtub body 102; a water inlet 109b; a spraying device 108; and a circulation pump 106. The bathtub device 101 of this embodiment is configured such that hot water taken from the bathtub body 102 from the water inlet 109b is circulated by the circulation pump 106 and sprayed out from the bathtub spray nozzle 109a and the spraying part 108a of the spraying device 108. That is, hot water in the bathtub body 102 is taken from the water inlet 109b by the circulation pump 106, and sprayed out from the spraying part 108a through the first pipe 104a, the chamber 111, and the second pipe 104b, which serve as circulation paths. In addition, the temperature of the hot water sprayed from the spray section 108a is detected by the spray temperature sensor 122 located on the downstream side of the chamber 111, and the temperature of the hot water in the bathtub body 102 is detected by the bathtub water temperature sensor 123, which serves as the detection unit.

[0152] Furthermore, the bathtub device 101 of this embodiment includes a temperature adjustment unit 107 for adjusting the temperature of the hot water sprayed from the spray section 108a. In this embodiment, the temperature adjustment unit 107 includes: an injection valve 140 for introducing hot water at the desired temperature into the circulation path; a supply path 141 connected to the upstream side of the injection valve 140; and a control unit 116 for controlling the injection valve 140. Two check valves 138 and a vacuum regulating valve 112 are connected to the upstream side of the supply path 141. Additionally, the supply path 141 is connected to a first pipe 104a upstream of the circulation pump 106, opening the injection valve 140, thereby allowing cold or hot water at a predetermined temperature within the supply path 141 to be introduced into the circulation path.

[0153] Furthermore, a drain solenoid valve 136 is connected to the supply flow path 141 to discharge hot water retained in the supply flow path 141. This drain solenoid valve 136 is opened and closed by a control signal from the control unit 116. The hot water discharged from the supply flow path 141 via the drain solenoid valve 136 is drained into the drain path 142. In addition, hot water flowing back from the supply flow path 141 to the vacuum regulating valve 112 is also discharged from the vacuum regulating valve 112 into the drain path 142. Thus, the upstream side of the supply flow path 141 and the vacuum regulating valve 112 is isolated, preventing hot water from flowing back from the supply flow path 141 into the supply system.

[0154] Next, the hot water supply system upstream of the vacuum regulating valve 112 will be described.

[0155] Cold water supplied from the water supply channel 154 flows into the low-temperature side solenoid valve 158 via the check valve 147. Meanwhile, a portion of the cold water supplied from the water supply channel 154 branches at branch 154a and flows into the water heater 152. The hot water heated in the water heater 152 flows into the high-temperature side solenoid valve 156. The cold and hot water flowing into the low-temperature side solenoid valve 158 and the high-temperature side solenoid valve 156 merge downstream, and the mixed hot water flows into the water flow sensor 124. Furthermore, the hot water flowing into the water flow sensor 124 flows into the vacuum regulating valve 112 via the water flow proportional valve 126 and the inflow-side thermistor 130.

[0156] The flow rate detected by the water flow sensor 124 and the temperature detected by the inflow-side thermistor 130 are input to the control unit 116. The control unit 116 can control the low-temperature side solenoid valve 158, the high-temperature side solenoid valve 156 and the water flow proportional valve 126 based on these detection signals, so that hot water flows into the supply flow path 141 at the desired temperature and flow rate via the vacuum regulating valve 112.

[0157] Next, refer to Figures 13 to 16 The function of the bathtub device 101 according to the second embodiment of the present invention will be explained.

[0158] Figure 13 The flowchart shown illustrates the process performed in the control unit 116 after hot water is injected into the bathtub body 102.

[0159] First of all, Figure 13 In step S101, the temperature of the hot water stored in the bathtub body 102, detected by the bathtub water temperature sensor 123, is input to the control unit 116.

[0160] Next, in step S102, it is determined whether the temperature of the input hot water is higher than the upper limit temperature T2 of the specified temperature range T. If the hot water temperature is higher than the upper limit temperature T2, proceed to step S103; if it is lower than the upper limit temperature T2, proceed to step S104. Figure 16 In the example shown, at the moment t100 when the hot water injection into the bathtub body 102 is completed, the temperature of the hot water in the bathtub body 102 is higher than the initial temperature T3 of the upper limit temperature T2, so the process in the flowchart proceeds to step S103.

[0161] In step S103, cold water is prepared to be mixed with the hot water sprayed from the spray section 108a of the spray device 108. Specifically, the control unit 116 sends a control signal to the drain solenoid valve 136, causing the drain solenoid valve 136 to open. As a result, the hot water retained in the supply flow path 141 upstream of the injection valve 140 is discharged through the drain path 142. Next, the control unit 116 sends a control signal to the low-temperature side solenoid valve 158, causing the low-temperature side solenoid valve 158 to open. As a result, the cold water supplied from the water supply channel 154 flows into the supply flow path 141 via the check valve 147, the low-temperature side solenoid valve 158, the water volume sensor 124, the water volume proportional valve 126, the inflow side thermistor 130, and the vacuum regulating valve 112. If the tap water flowing in through the vacuum regulating valve 112 fills the supply flow path 141, the control unit 116 closes the drain solenoid valve 136. Furthermore, after the low-temperature side solenoid valve 158 is opened, the temperature of the hot water introduced through the vacuum regulating valve 112 is not low enough. Therefore, after the temperature detected by the inflow side thermistor 130 drops to a specified temperature lower than the lower limit temperature T1, the control unit 116 closes the drain solenoid valve 136.

[0162] On the other hand, in step S102, if the temperature of the hot water in the bathtub body 102 is below the upper limit temperature T2, the process in the flowchart proceeds to step S104.

[0163] In step S104, it is determined whether the temperature of the hot water input in step S101 is lower than the lower limit temperature T1 of the specified temperature range T. If the temperature of the hot water is lower than the lower limit temperature T1, proceed to step S105; if the temperature is higher than the lower limit temperature T1, proceed to step S106.

[0164] In step S105, high-temperature hot water is prepared to mix with the hot water sprayed from the spray section 108a of the spray device 108. Specifically, the control unit 116 sends a control signal to the drain solenoid valve 136, causing the drain solenoid valve 136 to open. As a result, the hot water retained in the supply flow path 141 upstream of the injection valve 140 is discharged through the drain path 142. Next, the control unit 116 sends a control signal to the high-temperature side solenoid valve 156, causing the high-temperature side solenoid valve 156 to open. As a result, the high-temperature hot water flowing from the water heater 152 flows into the supply flow path 141 via the check valve 145, the high-temperature side solenoid valve 156, the water volume sensor 124, the water volume proportional valve 126, the inflow side thermistor 130, and the vacuum regulating valve 112.

[0165] If the hot water flowing in through the vacuum regulating valve 112 fills the supply flow path 141, the control unit 116 closes the drain solenoid valve 136. Furthermore, if the temperature of the hot water introduced through the vacuum regulating valve 112 is not high enough immediately after the water heater 152 is ignited, the control unit 116 closes the drain solenoid valve 136 after the temperature detected by the inflow-side thermistor 130 rises to a predetermined temperature higher than the lower limit temperature T1.

[0166] Next, in step S106, it is determined whether the bather has performed an operation to start the water spray from the spray device 108. If the bather has performed the water spray initiation operation, proceed to step S107; otherwise, return to step S101. Therefore, after hot water is injected into the bathtub body 102, the processes of steps S101 to S106 are repeated until the bather performs the water spray initiation operation. Furthermore, the processes in steps S103 and S105 are not repeated after these processes have been performed once, until a predetermined time has elapsed. That is, the purpose is to maintain the temperature of the cold or hot water filling the supply flow path 141 at a substantially constant temperature for a certain period of time.

[0167] If the person taking a bath initiates the water spraying operation, a water spraying start indication signal is sent to the control unit 116, and the process in the flowchart proceeds to step S107.

[0168] In step S107, it is determined whether the temperature of the hot water in the bathtub body 102 is higher than the upper limit temperature T2. If it is higher than the upper limit temperature T2, proceed to step S108; if it is lower than the upper limit temperature T2, proceed to step S109. Figure 16 In the example shown, the bather started the water spraying operation at time t101. At this time, the temperature of the hot water in the bathtub body 102 is higher than the upper limit temperature T2, so the process in the flowchart proceeds to step S108.

[0169] Execute in step S108 Figure 14 The subroutine shown. That is, through Figure 14 The subroutine shown executes the first temperature adjustment control, which lowers the water spray temperature further than the upper limit temperature T2.

[0170] exist Figure 14In step S201, water is started spraying from the spray section 108a of the spray device 108 by the control unit 116. Specifically, the control unit 116 sends a control signal to the circulation pump 106 to make the circulation pump 106 work. As a result, hot water is taken from the bathtub body 102 from the water inlet 109b and sprayed out from the spray section 108a through the first pipe 104a, the chamber 111, and the second pipe 104b, which serve as circulation paths. At the same time, the control unit 116 opens the injection valve 140, allowing tap water supplied from the supply path 141 to mix into the circulation path (first pipe 104a). Here, in step S103 ( Figure 13 In the first pipeline 104a, since tap water is filled in the supply flow path 141, low-temperature tap water can be mixed into the first pipeline 104a from the beginning.

[0171] Next, in step S202, after the water spraying begins at time t101, it is determined whether a predetermined temperature change suppression time has elapsed. If the predetermined temperature change suppression time has not elapsed, proceed to step S203; if the temperature change suppression time has elapsed, proceed to step S204.

[0172] In step S203, the control unit 116 performs temperature adjustment control to ensure that the temperature of the hot water sprayed from the water spray device 108 reaches the upper limit temperature T2. Specifically, the control unit 116 controls the water flow proportional valve 126 to ensure that the water spray temperature detected by the water spray temperature sensor 122 reaches the upper limit temperature T2. Figure 16 In the example shown, the temperature of the hot water sprayed from the water spraying device 108 drops rapidly after the water spraying begins at time t101, and then drops to the upper limit temperature T2 at time t102.

[0173] Next, in step S207, it is determined whether the prescribed water spraying duration has elapsed. If the water spraying duration has not elapsed, proceed to step S208; otherwise, end the process. Figure 14 The processing in the subroutine shown is restored to... Figure 13 The flowchart is shown. Furthermore, in step S208, it is determined whether the bather has initiated a water spray stop operation. If no water spray stop operation was performed, the process returns to step S202; if a water spray stop operation was performed, the process ends. Figure 14 The processing in the subroutine shown is restored to... Figure 13 The flowchart shown.

[0174] Therefore, after time t102, at Figure 16 In the example shown, Figure 14 The process of steps S202→S203→S207→S208→S202 is repeated. Then, in Figure 16At time t103, if the temperature change suppression time has elapsed, then Figure 14 The processing in the subroutine shown proceeds from step S202 to S204.

[0175] In step S204, the control unit 116 lowers the temperature of the hot water sprayed from the water spray device 108 compared to the upper limit temperature T2. Specifically, the control unit 116 controls the water flow proportional valve 126 based on the water spray temperature detected by the water spray temperature sensor 122, adjusting the flow rate of tap water mixed from the supply flow path 141 to the circulation flow path (first pipe 104a). Furthermore, the control unit 116 controls the water flow proportional valve 126 to gradually lower the temperature of the hot water sprayed from the water spray device 108.

[0176] Next, in step S205, it is determined whether the temperature of the hot water sprayed from the water spraying device 108 is above a predetermined intermediate temperature T4. If the hot water temperature is above the intermediate temperature T4, the process proceeds to step S207; otherwise, it proceeds to step S206. In this embodiment, the intermediate temperature T4 is set to a predetermined temperature that is below the upper limit temperature T2 and above the lower limit temperature T1. Figure 16 In the example shown, after time t103, Figure 14 The process of steps S205→S207→S208→S202→S204→S205 is repeated.

[0177] Furthermore, in Figure 16 At time t104, if the temperature of the hot water is lower than the intermediate temperature T4, then Figure 14 The processing in the subroutine shown proceeds from step S205 to S206. In step S206, the control unit 116 terminates the temperature adjustment control, maintaining the temperature of the hot water sprayed from the water spraying device 108 near the intermediate temperature T4. Figure 16 In the example shown, after time t104, at Figure 14 In the subroutine, the processing steps S206→S207→S208→S202→S204→S205→S206 are executed repeatedly.

[0178] As described above, after the temperature of the hot water sprayed from the water spray device 108 decreases to the upper limit temperature T2 (time t103), the control unit 116 controls the water flow proportional valve 126 to slowly decrease the temperature of the hot water. Therefore, compared to the decrease time B1 in the first stage C1 where the temperature of the hot water sprayed from the water spray device 108 decreases from the initial temperature T3 to the upper limit temperature T2, the decrease time B2 in the second stage C2 where the temperature of the hot water decreases from the upper limit temperature T2 to the intermediate temperature T4 becomes longer. As a result, the rate of temperature decrease R1 in the first stage C1 is greater than the rate of temperature decrease R2 in the second stage C2.

[0179] exist Figure 16 In the example shown, after a predetermined water spraying duration has elapsed at time t105, the processing in the control unit 116 starts from... Figure 14 The subroutine is restored to Figure 13 The flowchart (step S207 → return). Furthermore, even if the bather stops the water spraying, the processing in the control unit 116 resumes... Figure 13 The flowchart (step S208 → return).

[0180] if Figure 14 The processing in the subroutine ends, and the process returns to normal. Figure 13 If the flowchart is as shown, then execute... Figure 13 Step S113. In step S113, the control unit 116 sends a control signal to the circulation pump 106 to stop the circulation pump 106, and sends a control signal to the injection valve 140 to close the injection valve 140. By executing step S113, the water spraying from the water spraying device 108 is stopped. Figure 13 The processing in the flowchart has ended.

[0181] On the other hand, at the moment when the bather performs the water spraying operation ( Figure 13 In steps S106→S107), if the temperature of the hot water in the bathtub body 102 is below the upper limit temperature T2 and above the lower limit temperature T1, then... Figure 13 In the flowchart, steps S107→S109→S111→S112→S107 are repeated. Furthermore, if the prescribed water spraying time has elapsed (step S111 → end), or if the bather stops the water spraying (step S112 → end), then... Figure 13 The processing in the flowchart has ended.

[0182] Furthermore, at the moment when the bather performs the water spraying operation ( Figure 13 In steps S106→S107), if the temperature of the hot water in the bathtub body 102 is lower than the lower limit temperature T1 of the specified temperature range T, then... Figure 13In the flowchart, the process proceeds to steps S107→S109→S110, and execution is performed. Figure 15 The subroutine shown. Additionally, in Figure 17 In the example shown, hot water injection is completed at time t200, and the bathing user initiates the water spraying operation at time t201. At this time, the temperature of the hot water in the bathtub body 102 is lower than the lower limit temperature T1, therefore the process in the flowchart proceeds to step S110, through... Figure 15 The subroutine shown executes a second temperature adjustment control that raises the water spray temperature above the lower limit temperature T1.

[0183] exist Figure 15 In step S301, the control unit 116 starts spraying water from the spray section 108a of the spray device 108. That is, hot water is taken from the water inlet 109b from the bathtub body 102 and sprayed out from the spray section 108a through the first pipe 104a, chamber 111, and second pipe 104b, which serve as circulation paths. Simultaneously, the control unit 116 opens the injection valve 140, allowing hot water supplied from the supply path 141 to mix into the circulation path (first pipe 104a). Here, in step S105 ( Figure 13 In the first pipeline 104a, since the supply flow path 141 is filled with hot water at a temperature higher than the lower limit temperature T1, the hot water at a higher temperature can be mixed into the first pipeline 104a from the beginning.

[0184] Next, in step S302, after the water spraying begins at time t201, it is determined whether the predetermined temperature change suppression time has elapsed. If the predetermined temperature change suppression time has not elapsed, proceed to step S303; if the temperature change suppression time has elapsed, proceed to step S304.

[0185] In step S303, the control unit 116 performs temperature adjustment control to ensure that the temperature of the hot water sprayed from the water spray device 108 reaches the lower limit temperature T1. Specifically, the control unit 116 controls the water flow proportional valve 126 to ensure that the water spray temperature detected by the water spray temperature sensor 122 reaches the lower limit temperature T1. Figure 17 In the example shown, the temperature of the hot water sprayed from the water spraying device 108 rises rapidly after the water spraying begins at time t201, and rises to the lower limit temperature T1 at time t202.

[0186] Next, in step S307, it is determined whether the prescribed water spraying duration has elapsed. If the water spraying duration has not elapsed, proceed to step S308; otherwise, end the process. Figure 15 The processing in the subroutine shown is restored to... Figure 13The flowchart is shown. Furthermore, in step S308, it is determined whether the bather has initiated a water spray stop operation. If no water spray stop operation was performed, the process returns to step S302; if a water spray stop operation was performed, the process ends. Figure 15 The processing in the subroutine shown is restored to... Figure 13 The flowchart shown.

[0187] Therefore, after time t202, at Figure 17 In the example shown, Figure 15 The process of steps S302→S303→S307→S308→S302 is repeated. Then, in Figure 17 At time t203, if the temperature change suppression time has elapsed, then Figure 15 The processing in the subroutine shown proceeds from step S302 to S304.

[0188] In step S304, the control unit 116 raises the temperature of the hot water sprayed from the water spray device 108 compared to the lower limit temperature T1. Specifically, the control unit 116 controls the water flow proportional valve 126 based on the water spray temperature detected by the water spray temperature sensor 122, adjusting the flow rate of the high-temperature hot water mixed from the supply flow path 141 into the circulation flow path (first pipe 104a). Furthermore, the control unit 116 controls the water flow proportional valve 126 to ensure that the temperature of the hot water sprayed from the water spray device 108 rises slowly.

[0189] Next, in step S305, it is determined whether the temperature of the hot water sprayed from the water spraying device 108 is below a predetermined intermediate temperature T6. If the hot water temperature is below the intermediate temperature T6, the process proceeds to step S307; if it is above the intermediate temperature T6, the process proceeds to step S306. In this embodiment, the intermediate temperature T6 is set to a predetermined temperature that is below the upper limit temperature T2 and above the lower limit temperature T1. Figure 17 In the example shown, after time t203, Figure 15 The process of steps S305→S307→S308→S302→S304→S305 is repeated.

[0190] Furthermore, in Figure 17 At time t204, if the temperature of the hot water is higher than the intermediate temperature T6, then Figure 15 The processing in the subroutine shown proceeds from step S305 to S306. In step S306, the control unit 116 terminates the temperature adjustment control, maintaining the temperature of the hot water sprayed from the water spraying device 108 near the intermediate temperature T6. Figure 17 In the example shown, after time t204, at Figure 15In the subroutine, the processing steps S306→S307→S308→S302→S304→S305→S306 are executed repeatedly.

[0191] As described above, after the temperature of the hot water sprayed from the water spray device 108 rises to the lower limit temperature T1 (time t203), the control unit 116 controls the water flow proportional valve 126 to make the temperature of the hot water rise slowly. Therefore, compared with the rise time B11 in the first stage C11 from the initial temperature T5 to the lower limit temperature T1, the rise time B12 in the second stage C12 from the lower limit temperature T1 to the intermediate temperature T6 becomes longer. As a result, the rate of temperature rise R11 in the first stage C11 is greater than the rate of temperature rise R12 in the second stage C12.

[0192] exist Figure 17 In the example shown, after a predetermined water spraying duration has elapsed at time t205, the processing in control unit 116... Figure 15 The subroutine is restored to Figure 13 The flowchart (step S307 → return). Furthermore, even if the bather stops the water spraying, the processing in control unit 116 will resume. Figure 13 The flowchart (step S308 → Return).

[0193] if Figure 15 The processing in the subroutine ends, and the process returns to normal. Figure 13 If the flowchart is as shown, then execute... Figure 13 Step S113. In step S113, the control unit 116 sends a control signal to the circulation pump 106 to stop the circulation pump 106, and sends a control signal to the injection valve 140 to close the injection valve 140. By executing step S113, the water spraying from the water spraying device 108 stops. Figure 13 The processing in the flowchart has ended.

[0194] According to the bathtub device 101 of the second embodiment of the present invention, the temperature of the hot water in the bathtub body 102 is obtained when there is no water spraying from the spray unit 108a. Figure 13 In step S101), if the temperature is higher than the upper limit temperature T2, hot water (tap water) at a temperature lower than the upper limit temperature T2 flows into the supply flow path 141. Figure 13 Step S103). Therefore, if the control unit 116 receives an instruction signal to start water spraying, it can immediately mix hot water with a temperature lower than the upper limit temperature T2 in the supply flow path 141 into the hot water sprayed from the spray unit 108a. Figure 14Step S203) can quickly reduce the temperature of the hot water sprayed from the spray section 108a. Figure 16 (Times t101~t102).

[0195] As described above, in the bathtub device 101 according to the second embodiment of the present invention, the temperature of the hot water sprayed from the spray section 108a is lowered immediately after the water spraying begins. As a variation of this second embodiment, the structure of the bathtub device 1 according to the first embodiment of the present invention is used (…). Figure 6 It can also lower the temperature of the hot water sprayed out from the very beginning of the spraying process.

[0196] In this situation, when no water is being sprayed from the spray device 8, the control unit 16 obtains the temperature of the hot water in the bathtub body 2 via the bathtub water temperature sensor 123. If the obtained temperature is higher than the upper limit temperature T2, hot water (tap water) at a temperature lower than the upper limit temperature T2 is stored in the storage unit 12. If the control unit 16 receives an instruction signal to start spraying water from the spray device 8, it mixes the hot water stored in the storage unit 12 with the hot water sprayed from the spray device 8, thereby executing the spray water temperature adjustment mode.

[0197] That is, when the temperature of the hot water in the bathtub body 2 is higher than the upper limit temperature T2, the control unit 16 opens the low-temperature side solenoid valve 58 to fill the storage section 12 with tap water supplied from the water supply pipe 54 (the hot water stored in the storage section 12 overflows from the overflow pipe 44 by introducing tap water, thus lowering the temperature of the hot water in the storage section 12). Next, if an instruction signal to start spraying water from the spray device 8 is received, the control unit 16 opens the solenoid valve 40 and operates the second pump 14. As a result, the low-temperature hot water (tap water) in the storage section 12 is mixed with the hot water sprayed from the spray device 8 through the chamber 11.

[0198] In this modified example configured as described above, the temperature of the hot water in the bathtub body 2 is obtained when there is no water spraying from the spray device 8. If the temperature of the hot water is higher than the upper limit temperature T2, the hot water with a temperature lower than the upper limit temperature T2 is stored in the storage unit 12. Therefore, if the control unit 16 receives an instruction signal to start spraying, the hot water with a temperature lower than the upper limit temperature T2 in the storage unit 12 can be immediately mixed into the hot water sprayed from the spray device 8, and the temperature of the hot water sprayed from the spray device 8 can be reduced as quickly as possible.

[0199] According to the bathtub device 101 of the second embodiment of the present invention, the temperature of the hot water in the bathtub body 102 is obtained when there is no water spraying from the spray unit 108a. Figure 13In step S101, if the temperature is higher than the lower limit temperature T1, hot water with a temperature higher than the lower limit temperature T1 flows into the supply flow path 141. Figure 13 Step S105). Therefore, if the control unit 116 receives an instruction signal to start water spraying, it can immediately mix the hot water in the supply flow path 141 with the hot water sprayed from the spray unit 108a (the temperature of which is higher than the lower limit temperature T1). Figure 15 Step S303) can quickly raise the temperature of the hot water sprayed from the spray section 108a. Figure 17 (Times t201~t202).

[0200] As described above, in the bathtub device 101 according to the second embodiment of the present invention, the temperature of the hot water sprayed from the spray section 108a is raised after the water spraying begins. As a variation of this second embodiment, the structure of the bathtub device 1 according to the first embodiment of the present invention is used (…). Figure 6 It can also raise the temperature of the hot water sprayed out from the very beginning of the spraying process.

[0201] In this situation, when no water is being sprayed from the spray device 8, the control unit 16 obtains the temperature of the hot water in the bathtub body 2 via the bathtub water temperature sensor 123. If the obtained temperature is lower than the lower limit temperature T1, hot water with a temperature higher than the lower limit temperature T1 is stored in the storage unit 12. If the control unit 16 receives an instruction signal to start spraying water from the spray device 8, it mixes the hot water stored in the storage unit 12 with the hot water sprayed from the spray device 8, thereby executing the spray water temperature adjustment mode.

[0202] That is, when the temperature of the hot water in the bathtub body 2 is lower than the lower limit temperature T1, the control unit 16 opens the high-temperature side solenoid valve 56 to fill the storage section 12 with high-temperature hot water supplied from the water heater 52 (the hot water stored in the storage section 12 overflows from the overflow pipe 44 by introducing the high-temperature hot water, thus raising the temperature of the hot water in the storage section 12). Next, if an instruction signal to start spraying water from the spray device 8 is received, the control unit 16 opens the solenoid valve 40 and operates the second pump 14. As a result, the high-temperature hot water in the storage section 12 is mixed with the hot water sprayed from the spray device 8 through the chamber 11.

[0203] In this modified example configured as described above, the temperature of the hot water in the bathtub body 2 is obtained when there is no water spraying from the spray device 8. If the temperature is lower than the lower limit temperature T1, the hot water with a temperature higher than the lower limit temperature T1 is stored in the storage section 12. Therefore, if the control unit 16 receives an instruction signal to start spraying, the hot water with a temperature higher than the lower limit temperature T1 in the storage section 12 can be immediately mixed with the hot water sprayed from the spray device 8, and the temperature of the hot water sprayed from the spray device 8 can be raised as quickly as possible.

[0204] Explanation of the label

[0205] 1: Bathtub installation

[0206] 2: Bathtub body

[0207] 4: Circulating flow path

[0208] 6: Pump No. 1

[0209] 9: Water intake part

[0210] 9b: Water inlet (bathtub water inlet)

[0211] 10: Water supply path (supply pipeline)

[0212] 11: Chamber

[0213] 11a: Negative pressure generating section

[0214] 12: Storage Department (Storage Tanks)

[0215] 14: Pump No. 2 (Boosting Pump)

[0216] 16: Control Department

[0217] 101: Bathtub installation

[0218] 102: Bathtub body

[0219] 104a: Pipeline 1 (Circulation Flow Path)

[0220] 104b: Pipeline 2 (Circulation Flow Path)

[0221] 106: Circulation pump

[0222] 107: Temperature Control Department

[0223] 108: Water spray device

[0224] 108a: Water spray section

[0225] 109a: Bathtub spray nozzle

[0226] 109b: Water intake section

[0227] 111: Chamber

[0228] 112: Vacuum regulating valve

[0229] 116: Control Department

[0230] 122: Water spray temperature sensor

[0231] 123: Bathtub water temperature sensor (detection section)

[0232] 124: Water sensor

[0233] 126: Water proportional valve

[0234] 130: Inflow-side thermistor

[0235] 136: Drain solenoid valve

[0236] 138: Check valve

[0237] 140: Injection valve

[0238] 141: Supply Flow Path

[0239] 142: Drainage channel

[0240] 147: Check valve

[0241] 152: Water heater

[0242] 154: Sewerage

[0243] 154a: Branch Office

[0244] 156: High-temperature side solenoid valve

[0245] 158: Low-temperature side solenoid valve

Claims

1. A bathtub device that supplies hot water to the bathtub, The bathtub device is characterized by having: The main body of the bathtub, which is used to store hot water; The water inlet is used to extract hot water from the main body of the bathtub. A water spray unit is located above the main body of the bathtub, which sprays hot water taken from the water inlet toward the main body of the bathtub; A circulation path connects the water intake and the water spray section; A circulation pump, which is installed in the circulation flow path, delivers hot water taken from the water inlet into the circulation flow path; A temperature adjustment unit that adjusts the temperature of the hot water supplied to the spray unit; The detection unit measures the temperature of the hot water inside the bathtub body; and The control unit controls the temperature of the hot water supplied to the spray unit. The upper and lower limits of the specified temperature range of the hot water sprayed from the water jet section can be arbitrarily set. The control unit executes the following water spray temperature adjustment mode: If the temperature of the hot water inside the bathtub body, as detected by the detection unit, is higher than the upper limit of a predetermined temperature range, water is drawn from the water inlet, and the temperature adjustment unit lowers the temperature of the hot water sprayed from the spray nozzle into the bathtub body to within the predetermined temperature range. The control unit executes the following water spray temperature adjustment mode: If the temperature of the hot water inside the bathtub body, as detected by the detection unit, is lower than the lower limit of a specified temperature range, water is drawn from the water inlet, and the temperature adjustment unit raises the temperature of the hot water sprayed from the spray nozzle into the bathtub body to within the specified temperature range. The control unit maintains the temperature of the hot water sprayed from the spray unit within a specified range by executing the aforementioned water spray temperature adjustment mode. In the water spray temperature adjustment mode, the control unit, through the temperature adjustment unit, causes the temperature of the hot water sprayed from the spray nozzle to decrease or increase from the temperature of the hot water in the bathtub body in multiple stages until it reaches a temperature within the specified temperature range. In the water spray temperature adjustment mode of the control unit, the temperature of the hot water sprayed from the spray unit is reduced by the temperature adjustment unit in such a way that the rate of decrease of the temperature of the hot water sprayed from the spray unit in the first stage of the plurality of stages is greater than the rate of decrease in the second stage, or the temperature of the hot water sprayed from the spray unit is increased by the temperature adjustment unit in such a way that the rate of increase of the temperature of the hot water sprayed from the spray unit in the first stage of the plurality of stages is greater than the rate of increase in the second stage.

2. The bathtub device according to claim 1, wherein, In the water spray temperature adjustment mode, the control unit sprays water from the spray unit toward the bathtub body during the period from the start of water spraying to a predetermined time, so that the hot water taken from the water inlet is circulated. After the predetermined time, the temperature adjustment unit lowers the temperature of the hot water sprayed from the spray unit to the predetermined temperature range, or after the predetermined time, the temperature adjustment unit raises the temperature of the hot water sprayed from the spray unit to the predetermined temperature range.

3. The bathtub device according to claim 1, wherein, The temperature adjustment unit has a storage section for storing hot water at a desired temperature. The control unit is configured to, when no water is being sprayed from the spray unit, obtain the temperature of the hot water in the bathtub body via the detection unit; if the obtained temperature is higher than the upper limit temperature, store hot water at a temperature lower than the upper limit temperature in the storage section; if the obtained temperature is lower than the lower limit temperature, store hot water at a temperature higher than the lower limit temperature in the storage section. If the control unit receives an instruction signal to start spraying water from the spray unit, it mixes the hot water stored in the storage unit into the hot water sprayed from the spray unit, thereby executing the spray temperature adjustment mode.

4. The bathtub device according to claim 1, wherein, The temperature adjustment unit has a supply flow path for mixing hot water at the desired temperature into the circulation flow path. The control unit is configured to, when no water is being sprayed from the spray unit, obtain the temperature of the hot water in the bathtub body through the detection unit; if the obtained temperature is higher than the upper limit temperature, allow hot water at a temperature lower than the upper limit temperature to flow into the supply flow path; if the obtained temperature is lower than the lower limit temperature, allow hot water at a temperature higher than the lower limit temperature to flow into the supply flow path. If the control unit receives an instruction signal to start spraying water from the spray unit, it mixes the hot water in the supply path with the hot water sprayed from the spray unit, thereby executing the spray temperature adjustment mode.

5. The bathtub device according to claim 1, wherein, In the water spray temperature adjustment mode of the control unit, the temperature of the hot water sprayed from the spray unit is reduced by the temperature adjustment unit in such a way that the decrease time of the temperature of the hot water sprayed from the spray unit in the first stage of the plurality of stages is shorter than the decrease time in the second stage; or the temperature of the hot water sprayed from the spray unit is increased by the temperature adjustment unit in such a way that the increase time of the temperature of the hot water sprayed from the spray unit in the first stage of the plurality of stages is shorter than the increase time in the second stage.

6. The bathtub device according to claim 1, wherein, The water spray temperature adjustment mode of the control unit has the following temperature change suppression control: between the first stage and the second stage among the plurality of stages, the temperature decrease is less compared to either the first stage or the second stage, or... The water spray temperature adjustment mode of the control unit has the following temperature change suppression control: between the first stage and the second stage among the plurality of stages, the temperature rise is less compared to either the first stage or the second stage.

7. The bathtub device according to claim 6, wherein, In the water spray temperature adjustment mode of the control unit, the execution time of the temperature change suppression control is longer than the fall time in the first stage, or the execution time of the temperature change suppression control is longer than the rise time in the first stage.

8. The bathtub device according to claim 6, wherein, In the water spray temperature adjustment mode of the control unit, the execution time of the temperature change suppression control is shorter than the fall time in the second stage, or the execution time of the temperature change suppression control is shorter than the rise time in the second stage.

9. The bathtub device according to any one of claims 1 to 8, wherein, The temperature adjustment unit has a water supply path, which is connected to the circulation path to supply hot or cold water from an external supply source.

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