JP2012005691A - Bubble generator and circulation adapter integrated therewith - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bubble generator in which splash prevention performance and bubble quality can be improved without enlargement of the device.SOLUTION: A splash prevention plate 13 is attached at a prescribed gap distance ahead of a jet nozzle 15 by which a jet flow including micro-bubbles is discharged into a bathtub B. The splash prevention plate 13 includes an opening part 131 for passing the jet flow discharged into water and a sealing wall 132 for preventing a splash to an outer circumferential side thereof. A dent part 133 being a rear end face area of the sealing wall part 132 and extended in a doughnut ring shape to the outer circumferential side of the opening part 131 is formed, and the gap distance to a body housing 12 is extended by equal to the extension.

Description

  The present invention relates to a bubble generating device provided with a jet nozzle that is provided in a bathtub and discharges a jet flow containing micro bubbles in the bathtub water in the bathtub, and a circulation adapter that incorporates the bubble generating device. The present invention relates to a technique for preventing bubble performance from being impaired while installing a scattering prevention plate at a front position.

  2. Description of the Related Art Conventionally, a device in which a bubble generating device is incorporated in a circulation adapter installed in a bathtub has been proposed (for example, see Patent Document 1). This bubble generating device uses a circulating flow of bathtub water by the circulation adapter to eject a jet flow containing bubbles in the bathtub. That is, in the circulation operation by the circulation adapter of taking out the bathtub water from the inside of the bathtub and returning it into the bathtub again, the air is taken into the circulating water by using the negative pressure based on the discharge flow when returning the circulating water into the bathtub, Thereby, it is made to be made into the state where the bubble was mixed and discharged into the bathtub. More specifically, a swirl flow is generated in the swirl chamber by ejecting circulating water from the outer peripheral side to the swirl chamber, and air is taken into the swirl flow by the negative pressure acting upon the generation of the swirl flow, and this is ejected. By ejecting from the nozzle into the bathtub, a jet flow in which fine bubbles are mixed is discharged into the bathtub water. And in this bubble generating device, when the bathtub water level in the bathtub is lower than, for example, the ejection nozzle, the above-mentioned jet flow is released into the air and spreads to the outer peripheral side than the case where it is released into the water. In particular, when the bathtub lid is opened, a splash prevention plate is attached at a position a predetermined distance away from the ejection nozzle in consideration of the possibility of splashing outside the bathtub. Like to do. The scattering prevention plate includes an opening that does not obstruct the passage of the jet flow when the jet flow from the jet nozzle is discharged toward the water, and a shielding wall portion that shields the outer peripheral region of the opening. It is provided.

JP 2010-96421 A

  However, when the anti-scattering plate is attached, there is a risk that the quality of the air bubbles may be deteriorated particularly when the jet flow containing fine bubbles is discharged from the jet nozzle to the bathtub water, but it is equivalent to the case where the anti-scattering plate is not attached. It is conceivable that it is difficult to maintain both the quality of the air bubbles and to ensure the anti-scattering performance at the time of discharge of the jet flow into the air.

  That is, as illustrated in FIG. 11, when the swirling jet flow F is discharged from the jet nozzle 101 into a substantially conical shape with respect to the bath water in the front, the conical shape is formed and the front is directed forward. From the outer peripheral side of the jet flow F, the reverse flow K returns to the rear side, and the circulating flow K toward the inner peripheral jet nozzle 101 is generated. Due to the generation of the recirculation K, the jet flow F reaches the predetermined position with the bath water facing forward. However, the presence of the anti-scattering plate 102 hinders the smooth generation of the circulatory flow K. As a result, the momentum of the jet flow F is cut off, and the fine bubbles cannot reach the target position in the bath water. There is a risk of deteriorating the quality of the bubbles, such as a reduction in the number of fine bubbles and an increase in the size of larger bubbles. On the other hand, in order to generate a smoother circulation K, it may be possible to install the anti-scattering plate 102 at a front position farther away from the ejection nozzle 101. A protruding part to the inside is generated, or the size of the apparatus is increased.

  The present invention has been made in view of such circumstances, and the object of the present invention is to generate bubbles that can achieve both anti-scattering performance and improved bubble quality without causing an increase in the size of the apparatus. The object is to provide a device and a circulation adapter incorporating the same.

  In order to achieve the above object, according to the present invention, an ejection nozzle for discharging an ejection flow containing fine bubbles into a bathtub, and a scattering prevention plate attached to a front side position separated from the ejection nozzle by a predetermined gap interval And an opening for allowing the scattering prevention plate to pass the jet flow, and a shielding wall portion for blocking the area spreading to the outer peripheral side of the opening and preventing the jet flow from scattering. The following specific items are provided for the bubble generating apparatus that is provided. That is, a dent extending in a donut shape is formed in the region of the shielding wall facing the ejection nozzle side of the scattering prevention plate and in the outer peripheral side region of the opening.

  In the case of the present invention, due to the formation of the concave portion, the gap interval between the scattering prevention plate and the main body housing becomes the interval from the bottom position of the concave portion to the main body housing, and the gap interval in the state where the concave portion is not formed. As the dent is formed, it becomes larger. As a result, the passage cross-sectional area when the reflux flows from the outer peripheral side to the inner peripheral side with respect to the gap between the main body housing and the scattering prevention plate increases, and the pressure loss due to the inflow of the reflux is reduced accordingly. It will be able to flow smoothly. For this reason, even if the anti-scattering plate is attached to the main body housing at the same installation interval as before, the momentum of the jet flow is reduced due to the insufficient generation of the circulation, and the bubble quality deteriorates accordingly. It is possible to avoid the occurrence of inconveniences such as, and to make the jet flow containing fine bubbles reach a predetermined position in the bathtub. As a result, it is possible to achieve both the anti-scattering performance and the improvement of the bubble quality without increasing the size of the apparatus.

  In the above invention, an inclined surface reaching the bottom of the recess can be formed between the opening edge of the opening and the inner peripheral side of the recess. In this way, even if the water level in the bathtub is lower than the jet nozzle position and the jet flow from the jet nozzle tends to spread more, The flow direction is smoothly changed by being guided by the inclined surface, and can be eliminated along the bottom of the recess. As a result, the scattering prevention function can be exhibited more effectively and reliably.

  In addition, the concave portion in the present invention can be formed so that the inner peripheral side close to the opening is recessed deeper than the outer peripheral side far from the opening. By doing in this way, it becomes possible to make the inner peripheral side larger than the outer peripheral side as a gap interval between the main body housing and the scattering prevention plate. For this reason, compared with the case where the depth of the recess is made constant from the outer peripheral side to the inner peripheral side, the opening cross-sectional area through which the reflux can pass is relatively large, and the pressure loss due to the inflow of the reflux is reduced. Can be planned. Thereby, as a result of allowing the reflux to flow more smoothly, the bubble quality can be further improved.

  Furthermore, in the said invention, the 2nd dent part can be formed in the main body housing provided with the said ejection nozzle so as to oppose the dent part of the said scattering prevention board (Claim 4). By doing in this way, the clearance gap between the scattering prevention board and main body housing into which a recirculation | circulation flows in becomes larger by the part which formed the said 2nd recessed part. For this reason, it is possible to relatively reduce the pressure loss associated with the inflow of the recirculation flow by relatively increasing the cross-sectional area of the recirculation passage opening than in the case of only the recess on the scattering prevention plate side. Thereby, as a result of allowing the reflux to flow more smoothly, the bubble quality can be further improved.

  On the other hand, in the invention relating to the circulation adapter installed in the bathtub, by incorporating the bubble generating device according to any one of the above claims 1 to 4 (invention 5), the above claims 1 to claim. The effect | action by the bubble generator in any one of claim | item 4 will be acquired in a circulation adapter.

  As described above, according to the bubble generating device of the present invention, by forming the recessed portion with respect to the scattering preventing plate, the gap interval between the scattering preventing plate and the main body housing is reduced from the bottom position of the recessed portion to the main body housing. The interval can be made larger than the gap interval in which the recesses are not formed, as much as the recesses are formed. As a result, it is possible to increase the cross-sectional area through which the reflux flows from the outer peripheral side to the inner peripheral side with respect to the gap between the main body housing and the scattering prevention plate. It can be reduced and flowed smoothly. For this reason, even if the anti-scattering plate is attached to the main body housing at the same installation interval as before, the momentum of the jet flow is reduced due to the insufficient generation of the circulation, and the bubble quality deteriorates accordingly. It is possible to avoid the occurrence of inconveniences such as, and it is possible to reach the predetermined position in the bathtub with the jet flow containing fine bubbles. As a result, it is possible to achieve both the anti-scattering performance and the improvement of the bubble quality without increasing the size of the apparatus.

  In particular, according to claim 2, by forming an inclined surface that reaches the bottom of the recess portion between the opening edge of the opening portion and the inner peripheral side of the recess portion, in particular, the water level in the bathtub is greater than the position of the ejection nozzle. Even if the jet flow from the jet nozzle tends to expand further, the direction of the flow of the jet flow portion that expands to the outer peripheral side from the opening portion can be guided by the inclined surface and smoothly changed. And can be eliminated along the bottom of the recess. As a result, the scattering prevention function can be more effectively and reliably exhibited.

  According to the third aspect of the present invention, the concave portion is formed so that the inner peripheral side near the opening is recessed deeper than the outer peripheral side far from the opening, so that the outer periphery as a gap interval between the main body housing and the scattering prevention plate is formed. The inner peripheral side can be made larger than the side. For this reason, the opening cross-sectional area through which the reflux can pass can be made relatively larger than the case where the depth of the recess is made constant from the outer circumference side to the inner circumference side. Further reduction can be achieved. Thereby, as a result of allowing the reflux to flow more smoothly, the bubble quality can be further improved.

  Further, according to claim 4, the second recess is formed on the main body housing provided with the ejection nozzle so as to face the recess of the anti-scattering plate, so that the recirculation flows into the main housing. The clearance gap between the prevention plate and the main body housing can be made larger by the amount corresponding to the formation of the second recess. For this reason, the cross-sectional area of the circulating passage opening can be made relatively larger than in the case of only the dent on the scattering prevention plate side, and the pressure loss associated with the inflow of the circulating flow can be further reduced. Thereby, as a result of allowing the reflux to flow more smoothly, the bubble quality can be further improved.

  On the other hand, according to the invention relating to the circulation adapter installed in the bathtub, the effect of the bubble generating device according to any one of claims 1 to 4 can be obtained in the circulation adapter.

FIG. 1A is a cross-sectional explanatory view showing the bubble generating device according to the first embodiment in principle, and FIG. 1B is an explanatory view illustrating the anti-scattering plate as viewed from the inner surface side. . 2A is a diagram corresponding to FIG. 1A when the jet flow is released into the water, and FIG. 2B is a diagram corresponding to FIG. 1A when the jet flow is released into the air. It is. FIG. 3A is a diagram corresponding to FIG. 1A illustrating another embodiment 1, and FIG. 3B is a diagram corresponding to FIG. It is explanatory drawing which shows the example of the bath system to which 2nd Embodiment which incorporated the bubble generating apparatus in the circulation adapter is applied. It is a perspective view of the circulation adapter for memorial circulation which incorporated the bubble generator of 2nd Embodiment. It is AA sectional view explanatory drawing of FIG. It is explanatory drawing which shows the operating principle of the reheating operation using the circulation adapter of FIG.5 and FIG.6. FIG. 7 is a diagram corresponding to FIG. 7, illustrating an operation principle diagram of a bubble generation operation using the circulation adapter of FIGS. 5 and 6. It is an enlarged view of the principal part of FIG. 6 which abbreviate | omitted the switching lever etc. It is a disassembled perspective view of the circulation adapter which illustrates the inner surface side of a scattering prevention board. It is a figure corresponding to Drawing 1 (a) of a bubble generating device illustrated in order to show a subject of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<First Embodiment>
Fig.1 (a), FIG.2 (a), FIG.2 (b) shows the fundamental bubble generator 1 which concerns on 1st Embodiment. The bubble generating device 1 includes a main body housing 12 in which a swirl chamber 11 is formed and a scattering prevention plate 13 attached to a front position of the main body housing 12. The swirl chamber 11 has a cylindrical inner peripheral surface with the cylinder axis X as a central axis, and water (hot water or water) for generating a swirl flow passes through the internal passage 121 from the discharge port 122 to the tangential direction of the swirl chamber 11. It is designed to be discharged. An air discharge port 14 is opened on the cylinder axis X at the rear end of the swirl chamber 11 (right end in the drawing), and air taken in from the outside is sucked into the swirl chamber 11 by the action of a negative pressure described later. It has become so. The swirl chamber 11 communicates with the inside of the bathtub B through the ejection nozzle 15 whose hole diameter is reduced on the front end side. The ejection nozzle 15 is formed by a throttle 151 on the swirl chamber 11 side, and a throttle aperture opening 152 constituted by a trapezoidal inclined surface that gradually increases in diameter from the throttle 151 to the inside of the bathtub B.

  As shown in FIG. 1B, the scattering prevention plate 13 includes an opening 131 that opens coaxially with the swirl chamber 11 and the ejection nozzle 15 with respect to the central axis X, and an outer periphery of the opening 131. It is comprised from the shielding wall part 132 extended to the side. The scattering prevention plate 13 is connected to the main body housing 12 by a connecting portion (not shown), and is supported at a front position separated from the front end face facing the inside of the bathtub B of the main body housing 12 by a predetermined gap interval S. The opening 131 is formed so as to have an inner diameter that is substantially the same diameter as a projected circle formed by an extended surface of the inclined surface constituting the aperture opening 152 intersecting a surface facing the scattering prevention plate 13. ing. A recessed portion 133 is formed in the shielding wall portion 132 formed by the facing surfaces of the scattering prevention plate 13 (facing surfaces facing the front end surface of the main body housing 12). The recessed portion 133 is formed at least in the donut-shaped annular region on the outer peripheral side from the opening edge position of the opening 131, and preferably the outer peripheral position of the scattering prevention plate 13 (of the shielding wall portion 132 as shown in the figure). It is formed over the front region up to the outer peripheral edge position). A projecting edge 134 that projects sharply toward the body housing 12 is formed at an opening edge position that is a boundary position between the opening 131 and the recess 133, and is a shield that is an outer peripheral edge of the scattering prevention plate 13. A similar protruding edge 135 is also formed at the outer peripheral edge position of the wall portion 132. In particular, a portion from the projecting edge 134 to the bottom of the recess 133 is formed by an inclined surface 134a, and guides the direction of the flow at the outer peripheral side of the jet flow described later so as to smoothly guide the flow direction to the outer periphery along the recess 133. It has come to be able to do.

Due to the formation of the recess 133, the gap between the main body housing 12 becomes S ₀ (S ₀ > S), which is the distance from the bottom position of the recess 133 to the front end surface of the main body housing 12. Is larger than the gap interval S in the non-formed state by the formation of the recessed portion 133. As a result, the passage cross-sectional area M (see FIG. 1B) when the circulating flow K flows from the outer peripheral side to the inner peripheral side with respect to the gap between the main body housing 12 and the scattering prevention plate 13 increases. The pressure loss associated with the inflow of the reflux K is reduced so that the inflow can be smoothly performed.

  According to the first embodiment described above, when the water level in the bathtub B is higher than the jet nozzle 15 and the jet flow from the jet nozzle is released into the water in the bathtub B, FIG. ), First, a swirl flow in the swirl chamber 11 is generated by the water flow discharged from the discharge port 122, and a negative pressure acts on the air discharge port 14 along with this swirl flow, and the air discharge port 14. Thus, air is caught on the central axis X of the swirling flow. Then, as a result of the hollow swirling swirl flow once being throttled by the throttle portion 151 of the ejection nozzle 15 and then suddenly opening by the throttle opening portion 152, a predetermined conical shape including fine bubbles that are miniaturized based on the negative pressure action is obtained. The jet stream F that has become is discharged forward (to the left of the motion diagram). This jet flow F passes through the opening 131 of the anti-scattering plate 13 as it is, and advances through the bathtub water of the bathtub B to a predetermined position. At the same time, the water (hot water or water) in the outer peripheral side region of the jet flow F after passing through the opening 131 becomes the circulation K, and the inner periphery from the outer peripheral side with respect to the gap between the scattering prevention plate 13 and the main body housing 12. It flows in toward the side, and the jet flow F moves forward together with the inflowing circular flow K, and these are repeated.

  At this time, since the cross-sectional area of the passage increases due to the formation of the recess 133 as described above and the pressure loss is reduced, the circulating flow K flows more smoothly with respect to the jet flow discharged from the jet nozzle 15, so that the jet flow is It becomes possible to effectively and effectively release the bath water. As a result, even if the anti-scattering plate 13 is attached to the main body housing 12 at the same installation interval as before, the momentum of the jet flow may be reduced due to insufficient generation of the recirculation K, and the bubble quality accordingly. It is possible to avoid the inconvenience that the air quality deteriorates, and to make the jet flow containing fine bubbles reach the predetermined position in the bathtub B. As a result, it is possible to achieve both the anti-scattering performance and the improvement of the bubble quality without increasing the size of the apparatus.

  Although the inner peripheral side protrusion 134 becomes a bottleneck for the passage of the circulation K, the pressure loss up to this point can be reduced, so that the pressure loss for the inflow of the circulation K can be reduced as a whole. Will be able to.

  On the other hand, when the water level in the bathtub B is lower than the jet nozzle 15 and the jet flow from the jet nozzle is released into the air, the water is discharged from the jet nozzle 15 into the water as shown in FIG. Even if the ejected flow is discharged in a state of being expanded in a conical shape wider than that at the time of the operation, the flow F ′ on the outer peripheral side from the range of the opening 131 hits the shielding wall portion 132 of the scattering prevention plate 13 and the front of the bathtub B It will be prevented from scattering. At this time, the flow F ′ is smoothly guided by the projecting edge 134 which is the opening edge of the opening 131 and guided into the recess 133, and the outer peripheral projecting edge 135 moves toward the wall surface side of the rear bathtub B. The direction can be changed, and scattering to the inside of the bathtub B can be reliably prevented.

Second Embodiment
Fig.3 (a) shows the bubble generator which concerns on 2nd Embodiment. FIG. 3A shows the basic configuration as in the first embodiment. The second embodiment is different from the first embodiment only in that the concave shape of the donut-shaped concave portion 136 formed in the scattering prevention plate 13 is different from the concave portion 133 of the first embodiment, and all other configurations are the first. This is the same as the embodiment. For this reason, the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and redundant detailed description is omitted.

  The recess 136 of the second embodiment is formed so that the depth of the recess increases from the outer peripheral side to the inner peripheral side that is the opening 131 side. That is, it is a gap interval between the scattering prevention plate 13 and the main body housing 12 into which the circulation K (see FIG. 2A) flows, and the front end surface of the main body housing 12 and the bottom position of the recess 136. The gap interval constituted by the distance between the two is made larger as the distance from the outer peripheral side to the inner peripheral side increases. For this reason, the passage opening cross-sectional area of the circulation K is made relatively larger than in the case of the first embodiment in which the depth of the recess 133 (see FIG. 1A) is constant and the gap interval is also constant. As a result, the pressure loss accompanying the inflow of the recirculation K can be reduced, and as a result, the recirculation K can be made to flow more smoothly. As a result, the bubble quality can be further improved.

<Third Embodiment>
FIG.3 (b) shows the bubble generator which concerns on 3rd Embodiment. FIG. 3B also shows the basic configuration as in the first embodiment. The third embodiment differs from the first embodiment only in that a second recess 123 is formed on the front end face side of the main body housing 12 in addition to the recess 133 formed in the scattering prevention plate 13, and other configurations. Are all the same as in the first embodiment. For this reason, the same components as those in the first embodiment are denoted by the same reference numerals as those in the first embodiment, and redundant detailed description is omitted.

  The second recessed portion 123 is formed in a donut shape so as to face the recessed portion 133 in a region on the outer peripheral side from a position closest to the outer peripheral edge of the ejection nozzle 15, and preferably a main body as shown in the figure. It is formed in a range up to the outer peripheral end position of the housing 12.

  In the case of the third embodiment, both the second recess 123 on the body housing 12 side and the recess 133 on the scattering prevention plate 13 side are provided between the opposing surfaces of the body housing 12 and the scattering prevention plate auxiliary 13. Therefore, the clearance K between the scattering prevention plate 13 and the main body housing 12 into which the circulation K (see FIG. 2A) flows, and the bottom of the second recess 123 is formed. The clearance gap comprised by the distance between a position and the bottom position of the dent part 133 can be made larger than the case of 1st Embodiment and 2nd Embodiment. For this reason, compared with the case of 1st Embodiment or 2nd Embodiment, the passage opening cross-sectional area of the circulation K can be enlarged relatively, and the pressure loss accompanying the inflow of the circulation K can be reduced, thereby, As a result of allowing the reflux K to flow more smoothly, the bubble quality can be further improved.

<Fourth embodiment>
FIG. 4 shows a bath system to which the bubble generator of the fourth embodiment is applied. This bath system includes a tub B, a hot water heater 2 having a recirculation function for a bath, a recirculation piping 3 composed of a return path 31 and a forward path 32 and connecting the tub B and the hot water heater 2 to each other, It comprises a circulation adapter 4 incorporating a later-described bubble generating device 5 according to the fourth embodiment.

  The water heater 2 includes, for example, a reheating heat exchanger 21 and a combustion burner 22 that heats it. In addition, as the water heater 2, if it has a configuration for reheating, it is a two-can two-water type that has independent can bodies for reheating and hot water supply, or for reheating Can be used for both hot water supply and hot water supply, or a hot water circulation heating circuit is incorporated and heated by a liquid-liquid heat exchanger using the hot water as a heat source. Any one of them can be applied.

  In the bathtub B, the circulation adapter 4 is installed in the vicinity of the bottom of the one side wall surface, and the upstream end of the return path 31 of the recirculation circulation pipe 3 and the downstream of the forward path 32 with respect to the circulation adapter 4. The ends are connected. When the circulation pump 23 in the water heater 2 is activated, the bath water (hot water or water) in the bathtub B is returned to the heat exchanger 21 of the water heater 2 through the circulation adapter 4 and the return path 31, and then A circulation flow of being discharged into the bathtub B through the outgoing path 32 and the circulation adapter 4 is generated and the circulation operation is performed. When the combustion burner 22 is combusted during the circulation operation, the bath water returned from the bath B is heated to a predetermined temperature and reheated, and the combustion burner 22 is in a non-burning state. If it remains as it is, only the circulation flow by bathtub water will arise and it will be in a bubble generation operation mode.

  The circulation adapter 4 has a front cover body 41 and a scattering prevention plate 47 (see also FIG. 5) disposed on the inner side of the bathtub B, and an adapter main body 42 that also serves as a main body housing disposed mainly on the outer side of the bathtub B. And the return connection port 421 connected to the return path 31 and the forward connection port 422 connected to the forward path 32 protrude from the rear end of the adapter main body 42. At the same time, an air intake 51 is provided on the rear end surface of the adapter main body 42.

  The front cover body 41 covers the outer peripheral side of the donut ring-shaped part, and a filter member 410 composed of a large number of minute holes is mounted on the surface thereof. An anti-scattering plate 47 is attached to the inner peripheral region of the front cover body 41, and an opening 471 through which a jet flow containing fine bubbles is discharged (discharged or jetted) is located at the upper front position of the anti-scattering plate 47. An opening is formed. A switching lever 431 protrudes from a half-moon shaped guide opening 472 so as to be reciprocally movable in an arc shape at a lower position on the front surface of the anti-scattering plate 47. The switching lever 431 constitutes an operation unit for switching between the reheating operation mode and the bubble generation operation mode (bubble hot bath operation mode), and a switching valve mechanism 43 described later provided with the switching lever 431 is an adapter body. 42.

  6 shows the circulation adapter 4 in which the bubble generating device 5 is incorporated as a cross-sectional view taken along the line AA of FIG. 5, and FIG. 7 or FIG. The structure is shown.

  First, the schematic structure of the circulation adapter 4 will be described with reference mainly to FIG. 7 or FIG. The circulation adapter 4 includes a suction flow path 44 for sucking bathtub water from the bathtub B by the operation of the circulation pump 23 (see FIG. 4) and flowing it to the return path 31, and circulating water (tub water) from the forward path 32. ) In the bathtub B, and a bubble discharge channel 46 for discharging the circulated water from the outgoing path 32 as a jet flow into the bathtub B while containing fine bubbles. A switching valve for switching between circulating water from the outgoing path 32 to the side of the follow-up discharge passage 45 (follow-up operation mode) or to the side of the bubble discharge passage 46 (bubble generation operation mode) And a mechanism 43.

  As shown by an arrow R in FIG. 7 or 8, the suction flow path 44 joins the bath water sucked from the outer peripheral region of the front cover body 41 through the filter member 410 and then guides it to the return connection port 421. It extends like so. As shown by an arrow G in FIG. 7, the follow-up discharge channel 45 guides the circulating water from the forward connection port 422 to the diversion chamber 451 and then guides it to the lower side of the front cover body 41 through the opening / closing switching port 452. It extends so that it may discharge in the bathtub B from the reheating outlet 453 opened to the outer peripheral surface of the lower area | region.

  As shown by an arrow B in FIG. 8, the bubble discharge channel 46 guides the circulating water from the forward connection port 422 to the branch channel 461 as an internal passage through the branch chamber 451, and then from the discharge port 462. The swirl chamber 463 is ejected to generate a swirl flow in the swirl chamber 463, and the air sucked from the air discharge port 52 is ejected into the bathtub B through the ejection nozzle 464 and the opening 471 as a jet flow containing fine bubbles. It extends to release. The swirl chamber 463 has an inner peripheral surface formed in a cylindrical shape, and the discharge port 462 is opened to discharge the circulating water from the diversion chamber 451 in a tangential direction to the swirl chamber 463. The discharge of the circulating water from the discharge port 462 generates a swirl flow toward the ejection nozzle 464 in the swirl chamber 463, and the negative pressure is applied to the air discharge port 52, which will be described later, of the bubble generator 5 with the swirl flow. As a result, air is sucked from the air discharge port 52 to the center of the swirling flow. Then, as a result of the swirling flow in the swirling chamber 463 being suddenly diffused from the jet nozzle 464 having a narrowed inner diameter, it is discharged into the bathtub B as a jet flow in which fine bubbles are mixed.

  The switching valve mechanism 43 includes a switching shaft 432 that is disposed so that the switching lever 431 is fixed at the front end and penetrates the flow dividing chamber 451, and a first switching valve 433 and a second switching valve that are provided in the middle of the switching shaft 432. 434, and a shape memory alloy spring 435 and a bias spring 436 arranged with the first switching valve 432 interposed therebetween. This switching valve mechanism 43 can be automatically switched between the follow-up operation mode and the bubble generation operation mode depending on the temperature of the circulating water supplied to the diversion chamber 451, and can also be switched by the switching operation of the switching lever 431. Switching between the whispering operation mode and the bubble generation operation mode is possible. For example, if the temperature of the circulating water supplied to the diversion chamber 451 is a reheating high temperature (for example, 80 ° C.), the shape memory alloy spring 435 extends, and the first switching valve 433 blocks the diversion channel 461. On the other hand, the second switching valve 434 is automatically switched to the reheating operation mode in which the opening / closing switching port 452 is opened (see the state shown in FIG. 7). On the other hand, if the temperature of the circulating water is lower than the reheating high temperature, the shape memory alloy spring 435 contracts, whereby the first switching valve 433 opens the branch channel 461 while the second switching valve. 434 is automatically switched to the bubble generation operation mode in which the opening / closing switching port 452 is blocked (see the state shown in FIG. 8). Similarly, the switching shaft 432 can be rotated by switching operation of the switching lever 431 so that the switching operation mode and the bubble generation operation mode can be switched similarly.

  Next, the bubble generating device 5 will be described in more detail. As shown in FIG. 9, the front end side of the swirl chamber 463 defined in the adapter main body 42 is communicated with the inside of the bathtub through the ejection nozzle 464. A nozzle guide 48 in which a nozzle guide portion 481 is formed is attached to the front end surface of the adapter main body 42 where the ejection nozzle 464 is opened by screws 482, and the scattering prevention plate 47 is detachably attached to the nozzle guide 48. It has become. The nozzle guide portion 481 includes a trapezoidal guide surface that gradually increases in diameter toward the front (the left side in the figure), and has a shaft together with the swirl chamber 463, the ejection nozzle 464, and the opening portion 471 of the anti-scattering plate 47. It is arranged coaxially with Y. On the anti-scattering plate 47, locking claws 473 (see also FIG. 10) are formed so as to protrude toward the nozzle guide 48 from the upper and lower positions of the rear end surface, and correspond to the locking claws 473. The nozzle guide 48 at the position is formed with engagement holes 483 and 483 that are detachably engaged with the locking claws 473. The anti-scattering plate 47 is attached to the nozzle guide 48 by pushing the engaging claws 473 and 473 into the engaging holes 483 and 483 and engaging them. In addition, in FIG. 9, illustration of the upper latching claw is abbreviate | omitted and illustration of a switching lever etc. is abbreviate | omitted in any of FIG.9 and FIG.10.

  The scattering prevention plate 47 constitutes a shielding wall portion 474 that functions to prevent scattering when an outer peripheral side region of the opening 471 is discharged into the air, and a nozzle guide portion of the shielding wall portion 474 A recess 475 is formed on the rear end surface of the 481 side. The recess 475 is formed in a donut annular region on the outer peripheral side region of the opening 471, and an opening edge position that is a boundary position between the recess 475 and the opening 471 is pointed toward the nozzle guide 48. A protruding edge 476 is formed so as to protrude from the surface. By forming the recess 475, the gap distance between the adapter guide 42 and the nozzle guide 481 on the adapter main body 42 side is further increased, and the recirculation K is changed from the outer peripheral side to the inner peripheral side (as described in the first embodiment). The passage cross-sectional area when flowing into the axis Y side) is increased, and the pressure loss associated with the inflow of the recirculation K is reduced by that amount, so that the flow can flow smoothly.

  According to the fourth embodiment described above, the bubble generating device 1 described in the first embodiment can be embodied so as to be built in the circulation adapter 4, and the scattering prevention performance and the bubbles can be achieved without causing the device to be enlarged. The same operational effect as described in the first embodiment can be obtained that can achieve both improvement in quality.

<Other embodiments>
In addition, this invention is not limited to said each embodiment, Other various embodiment is included. That is, in each said embodiment, although the bubble generation apparatus 1 and the circulation adapter 4 incorporating the bubble generation apparatus 5 showed the example installed in the wall surface of the one side of the bathtub B, it is not restricted to this, A bubble generation apparatus 1 or the above-mentioned circulation adapter 4 may be installed on the bottom wall surface (bottom wall surface) of the bathtub B so that the jet stream containing bubbles is discharged upward with respect to the bathtub water.

  Although it is assumed that the recesses 133, 136, and 474 in the above embodiments are formed in a donut-shaped annular range, the annular range is not necessarily endless. For example, the attachment portion of the scattering prevention plates 13 and 47 It suffices if it is formed in an annular range excluding a very small region for forming the like.

  In the fourth embodiment, like the recess 136 of the second embodiment, a recess having a shape in which the depth of the recess is increased from the outer peripheral side to the opening 471 on the inner peripheral side is formed. Alternatively, a recess similar to the recess 123 on the main body housing 12 side of the third embodiment may be formed. As a dent part similar to the dent part 123 of the third embodiment, for example, a dent part as indicated by reference numeral 423 in FIG. 9, that is, a dent part 423 extending annularly in a donut shape at the outer peripheral side position of the ejection nozzle 464 is formed. You can do it.

Bubble generating device 4 Circulating adapter 15, 464 Injection nozzle 12 Main body housing 13, 47 Spattering prevention plate 42 Adapter main body (main body housing)
123, 423 Second recess 131, 471 Opening 132, 474 Shielding wall 133, 136, 475 Recess 134a Inclined surface B Bathtub F Jetted flow

Claims (5)

A jet nozzle for discharging a jet flow containing fine bubbles into the bathtub, and a splash prevention plate attached to a front side position spaced apart from the jet nozzle by a predetermined gap interval, wherein the splash prevention plate is the jet flow An air bubble generating device configured to include an opening for allowing the air to pass through and a shielding wall for shielding the region spreading to the outer peripheral side of the opening to prevent the jet flow from scattering. ,
A bubble generating device characterized in that a concave portion extending in a donut shape is formed in an area of the shielding wall portion facing the ejection nozzle side of the scattering prevention plate and in an outer peripheral side region of the opening. The bubble generating device according to claim 1,
A bubble generating device in which an inclined surface reaching the bottom of the recess is formed between the opening edge of the opening and the inner peripheral side of the recess. The bubble generating device according to claim 1 or 2,
The bubble generating device, wherein the recess is formed such that an inner peripheral side near the opening is recessed deeper than an outer peripheral side far from the opening. It is a bubble generator of Claims 1-3,
The bubble generating apparatus in which the 2nd dent part is formed in the main body housing provided with the said ejection nozzle so as to oppose the dent part of the said scattering prevention board. A circulation adapter installed in a bathtub,
The bubble generating device according to any one of claims 1 to 4 is incorporated.
A circulation adapter characterized by that.

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